GSM BSS InteroperabiIity Between GSM and WCDMA Feature Parameter Description

Copyright Huawei TechnoIogies Co., Ltd. 2012. AII rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

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Notice The purchased products, services and features are stipulated by the commercial contract made between Huawei and the customer. All or partial products, services and features described in this document may not be within the purchased scope or the usage scope. Unless otherwise agreed by the contract, all statements, information, and recommendations in this document are provided "AS S" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Contents 1 Introduction 1.1 Scope 1.2 ntended Audience 1.3 Change History 2 Overview 3 Iur-g Interface Between GSM and WCDMA 3.1 ntroduction to the ur-g nterface 3.2 Common Measurement 3.3 nformation Exchange 4 Measurement of Neighboring WCDMA CeIIs 5 GSM/WCDMA Inter-RAT CeII ReseIection 5.1 Cell Reselection from WCDMA to GSM 5.1.1 Cell Reselection from WCDMA to GSM for MSs in dle Mode 5.1.2 WCDMA-to-GSM NACC 5.2 Cell Reselection from GSM to WCDMA 5.2.1 Cell Reselection Based on Cell Ranking 5.2.2 Fast WCDMA Reselection at 2G CS Call Release 5.2.3 NC2 between GSM and WCDMA 6 GSM/WCDMA Inter-RAT CS Handover 6.1 CS Handover from WCDMA to GSM 6.2 CS Handover from GSM to WCDMA 6.2.1 Overview 6.3 Service-Based CS Handover from GSM to WCDMA 6.3.1 Overview 6.3.2 Procedure 6.4 Load-Based CS Handover from GSM to WCDMA 6.4.1 Overview 6.4.2 Procedure 7 GSM/WCDMA Inter-RAT PS Handover 7.1 WCDMA-to-GSM PS Handover 7.1.1 Overview 7.1.2 Procedure 7.2 GSM-to-WCDMA PS Handover 7.2.1 Overview 7.2.2 Procedure 8 ReIated Features 9 Impact on the Network 9.1 GSM/WCDMA nteroperability 9.1.1 mpact on System Capacity 9.1.2 mpact on Network Performance 9.2 GSM/WCDMA Service Based Handover 9.2.1 mpact on System Capacity 9.2.2 mpact on Network Performance 9.3 GSM/WCDMA Load Based Handover 9.3.1 mpact on System Capacity 9.3.2 mpact on Network Performance 9.4 2G/3G Cell Reselection Based on MS State 9.4.1 mpact on System Capacity 9.4.2 mpact on Network Performance 9.5 Fast WCDMA Reselection at 2G CS Call Release 9.5.1 mpact on System Capacity 9.5.2 mpact on Network Performance 10 Engineering GuideIines 10.1 When to Use nteroperability Between GSM and WCDMA 10.1.1 GSM/WCDMA nteroperability 10.1.2 GSM/WCDMA Service Based Handover 10.1.3 GSM/WCDMA Load Based Handover 10.1.4 2G/3G Cell Reselection Based on MS State 10.1.5 Fast WCDMA Reselection at 2G CS Call Release 10.2 nformation to Be Collected 10.2.1 GSM/WCDMA nteroperability 10.2.2 GSM/WCDMA Service Based Handover 10.2.3 GSM/WCDMA Load Based Handover 10.2.4 2G/3G Cell Reselection Based on MS State 10.2.5 2G/3G Cell Reselection Based on MS State 10.3 Network Planning 10.3.1 GSM/WCDMA nteroperability 10.3.2 GSM/WCDMA Service Based Handover 10.3.3 GSM/WCDMA Load Based Handover 10.3.4 2G/3G Cell Reselection Based on MS State 10.3.5 Fast WCDMA Reselection at 2G CS Call Release 10.4 Overall Deployment Procedure 10.5 Deploying GSM/WCDMA nteroperability 10.6 Deploying 2G/3G Cell Reselection Based on MS State 10.7 Deploying GSM/WCDMA Service Based Handover 10.8 Deploying GSM/WCDMA Load Based Handover 10.9 Deploying Fast WCDMA Reselection at 2G CS Call Release 10.10 Related Parameters in the System nformation 10.11 Neighboring WCDMA Cell Configuration 10.12 ur-g nterface Between GSM and WCDMA 10.13 GSM/WCDMA nter-RAT NC2 and GSM/WCDMA nter-RAT PS Handover 10.14 Performance Optimization 10.14.1 GSM/WCDMA nteroperability and 2G/3G Cell Reselection Based on MS State 10.14.2 GSM/WCDMA Service Based Handover and GSM/WCDMA Load Based Handover 10.14.3 Fast WCDMA Reselection at 2G CS Call Release 10.15 Troubleshooting 11 Parameters 12 Counters 13 GIossary 14 Reference Documents

1 Introduction 1.1 Scope This document describes the nteroperability Between GSM and WCDMA feature, including its technical description, feature dependencies, network impact, and engineering guidelines. The technical description includes measurement of neighboring WCDMA cells, GSM/WCDMA inter-RAT cell reselection, and GSM/WCDMA inter-RAT CS/PS handover. The nteroperability Between GSM and WCDMA feature involves the following features: ! GBFD-114301 GSM/WCDMA nteroperability ! GBFD-114321 GSM/WCDMA Service Based Handover ! GBFD-114322 GSM/WCDMA Load Based Handover ! GBFD-114323 2G/3G Cell Reselection Based on MS State ! GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release ! GBFD-511101 Load Based Handover Enhancement on ur-g ! GBFD-511102 NACC Procedure Optimization Based on ur-g ! GBFD-511103 GSM and WCDMA Load Balancing Based on ur-g ! GBFD-511104 GSM and WCDMA Traffic Steering Based on ur-g ! GBFD-119502 PS Handover ! GBFD-116201 Network-Controlled Cell Reselection (NC2) The following features are described in this document: ! GBFD-114301 GSM/WCDMA nteroperability ! GBFD-114321 GSM/WCDMA Service Based Handover ! GBFD-114322 GSM/WCDMA Load Based Handover ! GBFD-114323 2G/3G Cell Reselection Based on MS State ! GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release ! GBFD-119502 PS Handover ! GBFD-116201 Network-Controlled Cell Reselection (NC2) The following features are described in the Common Radio Resource Management Feature Parameter Description: ! GBFD-511101 Load Based Handover Enhancement on ur-g ! GBFD-511102 NACC Procedure Optimization Based on ur-g ! GBFD-511103 GSM and WCDMA Load Balancing Based on ur-g ! GBFD-511104 GSM and WCDMA Traffic Steering Based on ur-g 1.2 Intended Audience This document is intended for: ! Personnel who need to understand the nteroperability Between GSM and WCDMA feature ! Personnel who work with Huawei GSM products 1.3 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: ! Feature change: refers to a change in the nteroperability Between GSM and WCDMA feature of a specific product version. ! Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version. Document Issues The document issue is as follows: ! 02 (2012-06-30) ! 01 (2011-03-31) ! Draft A (2011-01-15) 02(2012-06-30) This is the second release of GBSS13.0. Compared with issue 01 (2011-03-31) of GBSS13.0, issue 02 (2012-06-30) of GBSS13.0 incorporates the changes described in the following table. Change TypeChange DescriptionParameter Change Feature changeNoneNone Editorial changeAdded the following chapters: ! Chapter 8 Related Features ! Chapter 9 mpact on the Network ! Chapter 10 Engineering Guidelines Deleted descriptions about cell reselection based on cell priority. None 01(2011-03-31) This is the first release of GBSS13.0. Compared with issue Draft A (2011-01-15) of GBSS13.0, issue 01 (2011-03-31) of GBSS13.0 has no change. Draft A (2011-01-15) This is the draft release of GBSS13.0. Compared with issue 01 (2010-06-30) of GBSS12.0, draft A (2011-01-15) of GBSS13.0 incorporates the changes described in the following table. Change TypeChange DescriptionParameter Change Feature change! Added a description of the PS handover between GSM andWCDMA. ! Added a description of the NC2 between GSM and WCDMA. The added parameters are listed as follows: ! SPTINTERRATINBSCPSHO ! SPTINTERRATOUTBSCPSHO ! PFCSUP ! NACCSPT ! NCO ! FDDFREQCNUM ! FDDCELLOFF ! FDDCELLTHRED ! TrafficReselAllow Editorial changeThe following contents are optimized: ! GSM-to-WCDMA cell reselection. ! GSM-to-WCDMA CS handover. ! Setting of GSM and WCDMAconfiguration parameters. None

2 Overview WCDMA and GSM will coexist for a long time. Therefore, Huawei GSM BSS provides GSM/WCDMA interoperability, which allows inter-RAT handovers and inter-RAT cell reselections between GSM and WCDMA. GSM/WCDMA interoperability supports smooth evolution from GSM to WCDMA, which helps reduce operators' capital expenditure (CAPEX). This feature provides operators with both WCDMA and GSM networks complete support for a seamless coverage from GSM to WCDMA. For example, with the cell reselection or handover function, operators can keep providing services for a dual-mode MS that moves away from the WCDMA coverage, thereby improving user experience. n areas covered by both GSM and WCDMA networks, nteroperability between GSM and WCDMA balances traffic loads between two networks. For example, when the traffic load in a GSM cell is too high, nteroperability between GSM and WCDMA can hand over some calls in the GSM cell to a WCDMA cell. nteroperability between GSM and WCDMA also allows operators to set different service access policies in areas covered by both GSM and WCDMA networks. For example,GSM is preferentially selected for handling CS services and WCDMA for PS services. All MSs mentioned in this document are multi-mode MSs that support both GSM and WCDMA. 3 Iur-g Interface Between GSM and WCDMA 3.1 Introduction to the Iur-g Interface Load information exchange is a prerequisite for the nteroperability Between GSM and WCDMA feature. Load information exchange consists of the following types: ! Load information exchange through the core network (CN): Load information, which is carried in the information elements (Es) in the signaling for handovers, is exchanged between the GSM BSC over the A interface and the WCDMA RNC over the u interface. n this situation, load information exchanges irregularly. Therefore, unnecessary handover attempts may occur. ! Load information exchange through the ur-g interface: Load information is exchanged between the GSM BSC and the WCDMA RNC through the ur-g interface instead of the CN. Through the ur-g interface, the GSM BSC and WCDMA RNC can exchange load information with each other by performing information exchange and common measurement. This simplifies the GSM/WCDMA interoperability procedure, shortens the handover delay, and increases the handover success rate. Figure 3-1 shows the position of the ur-g interface on a network. Figure 3-1 Position of the ur-g interface on a network Figure 3-2 shows the protocol stack defined in 3GPP specifications for the ur-g interface. Figure 3-2 Protocol stack defined in 3GPP specifications for the ur-g interface

The ur-g interface has a control plane and does not have a user plane. The ur-g interface uses P transmission. There is an ur-g interface instance between each remote RNC and a local BSC. The ur-g interface supports common measurement and information exchange procedures. These two procedures are performed through connection-oriented signaling. 3.2 Common Measurement Common measurement is based on the ur-g interface. The procedures of common measurement are performed through connection-oriented signaling. Common measurement is enabled if SPTCOMMMEAS is set to Yes. Common measurement involves the following procedures: 1. Common measurement initialization The source BSC/RNC sends a COMMON MEASUREMENT NTATON REQUEST message to the target RNC/BSC to initialize the common measurement initialization procedure, requesting the target RNC/BSC to periodically report the load information about its neighboring cells. f the target RNC/BSC supports common measurement, it responds with a COMMON MEASUREMENT NTATON RESPOSE message, as shown in Figure 3-3. Figure 3-3 Successful common measurement initialization

f the target RNC/BSC does not support common measurement or rejects the common measurement request, it responds with a COMMON MEASUREMENT NTATON FALURE message, as shown in Figure 3-4. Figure 3-4 Failed common measurement initialization

2. Periodic common measurement reporting After a common measurement is successfully initialized, the target RNC/BSC periodically sends COMMON MEASUREMENT REPORT messages to the source BSC/RNC toreport the load information about neighboring cells, as shown in Figure 3-5. Figure 3-5 Common measurement reporting procedure

f a neighboring cell is faulty, blocked, removed, or deactivated, the target RNC/BSC sends a COMMON MEASUREMENT FALURE NDCATON message to the source BSC/RNC, notifying the source BSC/RNC that the common measurement procedure has failed and must be terminated, as shown in Figure 3-6. Figure 3-6 Failed common measurement

3.3 Information Exchange During a common measurement procedure, the ur-g interface carries the load information about GSM and WCDMA cells, the inter-RAT CS service handover support flags of GSM cells, and the inter-RAT PS service handover support flags of GSM cells. This section uses load information about GSM cells as an example. The information exchange is enabled if SPTINFOEXCHG is set to Yes and INFOEXCHGLIST is set to CELLCAPCLASS. The load state of a cell can be normal, basic congestion, or overload congestion. Table 3-1 describes the rules for determining the load states of GSM cells. TabIe 3-1 Rules for determining the load states of GSM cells UpIink/DownIinkIf...Then the Load State of the CeII Is. UplinkUplink load < UlLdrThrd2GCellNormal UlLdrThrd2GCell > Uplink load Downlink load RLA_C + FDDQOFF ! CPCH Ec/No < FDDQMIN - FDDQMINOFFSET ! CPCH RSCP < FDD_RSCP_threshold n WCDMA, Ec/No is the ratio of energy per modulating bit to the noise spectral density. t is equivalent to C/ in GSM. Where, ! RLA_C is the average receive level. n a GSM-to-WCDMA cell reselection, the RSCP of the neighboring WCDMA cell must meet the following requirements: ! RSCP > Average receive level of the serving cell + FDDQOFF ! RSCP > Receive level of each neighboring GSM cell + FDDQOFF! FDDQOFF is the receive level difference between the candidate WCDMA cell and the serving GSM cell. This parameter is a key factor for controlling the GSM-to-WCDMA cell reselection. The greater the value of FDDQOFF is, the more difficult it is for the GSM-to-WCDMA cell reselection condition to be met, and more MSs will camp on theGSM cell. ! FDDQMIN is the minimum Ec/No threshold for GSM-to-WCDMA cell reselection. The greater the value of FDDQMIN is, the more difficult it is to meet the cell reselection condition. FDDQMINOFFSET is offset of the minimum Ec/No threshold for GSM-to-WCDMA cell reselection. An MS determines the minimum receive level of a candidateWCDMA cell for cell reselection based on FDDQMIN and FDDQMINOFFSET. That is, FDDQMIN and FDDQMINOFFSET do not determine the cell reselection from GSM toWCDMA directly but guarantee the signal quality of the candidate WCDMA cell. ! FDD_RSCP_threshold is calculated as follows: ! f FDD_RSCPmin is broadcast in the serving cell, then FDD_RSCP_threshold = FDDRSCPMIN - min((P_MAX - 21 dBm), 3 dB). ! f FDD_RSCPmin is not broadcast in the serving cell and Qrxlevmin and Pcompensation can be obtained in the serving cell, then FDD_RSCP_threshold = Qrxlevmin + Pcompensation + 10 dB ! f FDD_RSCPmin is not broadcast in the serving cell and Qrxlevmin and Pcompensation cannot be obtained in the serving cell, then FDD_RSCP_threshold = -102dBm (the default value of FDD_RSCPmin). Where, ! P_MAX is the maximum RF output power of an MS in a WCDMA cell. ! Qrxlevmin is the minimum required RX level in a WCDMA cell. ! Pcompensation is max(UE_TXPWR_MAX_RACH P_MAX, 0). ! UE_TXPWR_MAX_RACH is the maximum TX power level an MS may use when accessing a WCDMA cell on RACH. ! FDDRSCPMIN is used to calculate the FDD_RSCP_threshold of the target cell for a GSM-to-WCDMA cell reselection. f multiple WCDMA cells meet the cell reselection conditions, the MS selects the cell with the highest RSCP as the target cell. The GSM-to-WCDMA cell reselection cannot be triggered within five seconds after the WCDMA-to-GSM cell reselection. n case of a cell reselection occurring within the previous 15 seconds, FDDQOFF is increased by 5 dB. f both the conditions for the GSM-to-WCDMA cell reselection and those for the GSM-to-GSM cell reselection are met, the MS selects a WCDMA cell as the target cell. 5.2.2 Fast WCDMA ReseIection at 2G CS CaII ReIease This section describes the feature GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release Overview When an MS terminates a call in the GSM network, it camps on the cell in which the call is released and then starts neighboring cell measurement. When a neighboringWCDMA cell meets the requirements for cell reselection, the MS reselects the WCDMA cell. The WCDMA cell reselection is initiated after the MS receives the S and performs the related calculation. When the feature Fast WCDMA Reselection at 2G CS Call Release is activated, the BSS selects the best neighboring WCDMA cell based on the measurement information after the MS in a GSM cell terminates a CS call. Then, the BSS sends the MS the cell information through the Channel Release message, instructing the MS to camp on thatWCDMA cell. With this feature, an MS can camp on a WCDMA cell without performing cell reselection decisions, accelerating cell reselection. This feature allows the MS tocamp on the WCDMA cell for a longer period. n addition, the number of location area updates is reduced, and the paging success rate is increased, increasing the revenue of operators in the WCDMA network. The WCDMA network in this document refers to the UTRAN FDD. FDD stands for frequency division duplex (FDD). Procedure After an MS in a GSM cell releases a CS call, the BSC sends the MS a Channel Release message that carries the E "Cell selection indicator after release of all TCH and SDCCH". This E carries the neighboring WCDMA cell information, facilitating the MS to reselect a WCDMA cell. This feature needs the support of both the network and the MS. Figure 5-2 shows the cell reselection procedure for an MS-terminated call. Figure 5-2 Procedure for fast WCDMA reselection at 2G CS call release

1. After receiving a Release Complete message from the MS, the MSC sends a Clear Command message to the BSC, instructing the BSC to release the occupied resources on the A and Um interfaces. 2. The BSC sends a Channel Release message to the MS, instructing the MS to release the TCH or SDCCH on the Um interface. The Channel Release message may carry the E "Cell selection indicator after release of all TCH and SDCCH", which contains the information about the target neighboring WCDMA cell. The MS in the serving GSM cell measures neighboring cells. If...Then... The information about neighboring WCDMAcells is carried in a measurement report (MR) The BSC carries the information (including FDD-ARFCN and FDD_CELL_NFORMATON) about the best neighboring WCDMA cell in the Channel Release message, instructing the MS to reselect that neighboring WCDMA cell. No neighboring WCDMA cell information is carried in an MR or the value ofCELLSELECTAFTERCALLREL is NO(No) The BSC does not carry the E "Cell selection indicator after release of all TCH and SDCCH" in the Channel Release message.

3. After receiving the Channel Release message, the MS releases the main signaling link. Then, the MS sends a DSC frame to the BTS, instructing the BTS to release the TCH or SDCCH. 4. After receiving an Unnumbered Acknowledgement message, the MS switches to idle mode and initiates cell reselection based on the E "Cell selection indicator after release of all TCH and SDCCH". If...Then... The Channel Release message contains the E "Cell selection indicator after release of all TCH and SDCCH"

The MS attempts to camp on the cell indicated in the Channel Release message. The Channel Release message does not contain the E "Cell selection indicator after release of all TCH and SDCCH" The MS attempts to camp on the cell where the TCH or SDCCH is already released.

5. f step 4 fails, the MS performs a normal cell reselection procedure to camp on any appropriate cells. 5.2.3 NC2 between GSM and WCDMA This section describes the feature GBFD-116201 NC2 between GSM and WCDMA. NC2 cell reselection can be performed for inter-RAT cell reselection only when an MS is in packet transfer mode. NC2 cell reselection between GSM and WCDMA refers to the network-controlled cell reselection from GSM to WCDMA triggered by a BSC. NC2 cell reselection is activated after the NCO parameter is set to NC2(NC2). n NC2 cell reselection mode, an MS generally determines whether to measure neighboring WCDMA cells based on the value of QI and the receive level of the serving cell. f any of the following conditions are met, the MS determines whether to measure neighboring WCDMA cells based on the value of QP and the receive level of the serving cell: ! The serving GSM cell has a PBCCH, and QP is broadcast on the PBCCH. ! The serving GSM cell does not have a PBCCH but QP is broadcast on the BCCH. n addition, MSs have received the Packet Cell Change Order message or the Packet Measurement Order message that carries the GPRS cell reselection parameters of one or more WCDMA cells. n NC2 cell reselection mode, an MS performs inter-RAT neighboring WCDMA cell measurements based on QP, FDDFREQCNUM, FDDCELLOFF, and FDDCELLTHRED and sends MRs. ! QP is the threshold for an MS in PS mode to search for WCDMA cells. f the level of the serving GSM cell is lower than the value of QP (when QP is within the range of 0 to6) or higher than the value of QP (when QP is within the range of 8 to 14), the MS starts to search for WCDMA cells. ! FDDFREQCNUM is the number of WCDMA cells that should be contained in the best cell list, which is carried in the MR from an MS. ! FDDCELLOFF is the receive level offset for WCDMA cells. During the ranking of measured neighboring cells, the value of this parameter is added to the receive level of measured WCDMA cells. ! FDDCELLTHRED is the threshold for reporting a WCDMA cell. The MS reports only the cells whose RSCP is greater than this threshold. Figure 5-3 shows the procedure for NC2 cell reselection between GSM and WCDMA. Figure 5-3 Procedure for NC2 cell reselection between GSM and WCDMA

1. AnMSintheGPRSMobilityManagement(GMM)ReadystateperiodicallysendsPacket MeasurementReportmessagesorPacketEnhancedMeasurementReportmessages to the BSC. These MRs contain the RSCP of neighboring WCDMA cells. 2. AfterreceivingapacketMR,theBSCprocessesthemeasurementresults.Then,theBSC determines whether to perform a cell reselection. 3. ftheBSCdetermines to initiateacellreselection,itsendsthePacketCellChangeOrder message to theMS to instructtheMS to reselectthespecifiedtarget WCDMAcell.Targetcell reselection is based on the NC2 cell reselection algorithm. 4. facellreselectionfails,theMSsendsthePacketCellChangeFailuremessage to theBSC. Afterreceivingthismessage,theBSCsubtracts PENALTYRXLEV fromthereceivelevelofthe target cell. f the receive level of the target cell is less than PENALTYRXLEV, the BSC sets the receive level of the target cell to 0. The NC2 cell reselection algorithms include the service-based NC2 cell reselection algorithm, quality-based NC2 cell reselection algorithm, load-based NC2 cell reselection algorithm. Service-Based NC2 CeII ReseIection AIgorithm The service-based NC2 cell reselection is activated when TrafficReselAllow is set to PERMIT(Permit). The BSC may find the E "Service UTRAN CCO" in multiple DL-UNTDATA PDUs, CREATE-BSS-PFC PDUs, or PS-HANDOVER-REQUEST PDUs sent from the SGSN. The BSS considers that the last received E "Service UTRAN CCO" is of the highest priority. The E "Service UTRAN CCO" carries Service UTRAN CCO VaIue part, which indicates the most suitable RAT for the current service. Table 5-1 lists the values of Service UTRAN CCO VaIue part and their meanings. TabIe 5-1 Values of Service UTRAN CCO Value part and their meanings Coding BitsMeaning 000Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should be performed 001Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should not be performed 010Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should not be performed 111f received, should be interpreted as no information available (bits 4-5 valid) Other valuesf received, should be interpreted as no information available

f the value of Service UTRAN CCO VaIue part is 000, the MS triggers a service-based cell reselection and selects the neighboring WCDMA cell with the highest receive level. f no neighboring WCDMA cell is available, the MS proceeds to perform a quality-based, load-based, or coverage-based NC2 cell reselection. QuaIity-Based NC2 CeII ReseIection AIgorithm The quality-based NC2 cell reselection is activated when URGENTRESELALLOW is set to PERMIT(Permit). When the conditions for triggering a service-based NC2 cell reselection are not met, the BSC determines whether to initiate a cell reselection based on the receive quality of the radio link on the Um interface. The MRs or Bit Error Rate (BER) indicates the receive quality on the radio link and the number of times bad radio link quality occurs. n a receive quality measurement period, if the MS receive quality deterioration ratio is greater than the CELLRXQUALWORSENRATIOTHRSH parameter, a quality-based NC2 cell reselection is initiated. ! MS receive quality deterioration ratio = Times of bad radio link quality/Number of radio link quality MRs n quality-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. n quality-based NC2 cell reselection, the candidate WCDMA cell with the highest receive level is selected as the target cell. f NC2LoadResel is set to Support(Support), the cell characteristics information also includes the load of the candidate GSMcells under the same BSC. n quality-based NC2 cell reselection, a candidate cell must meet the following conditions: ! Receive level of the neighboring GSM candidate cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST. ! Measured RSCP of the neighboring WCDMA cell > FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cells under the same BSC are not congested. ! When Service UTRAN CCO VaIue part is set to 010 or 001, none of the neighboring WCDMA cells is selected as the target cell. Then, the highest level candidate cell within the highest priority cells is selected as the target cell. f a neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM to WCDMA is triggered. Load-Based NC2 CeII ReseIection AIgorithm The load-based NC2 cell reselection algorithm is activated when LOADRESELALLOW is set to PERMIT(Permit). When neither the conditions for initiating a service-based NC2 cell reselection nor the conditions for initiating a quality-based NC2 cell reselection are met, a load-based NC2 cell reselection is initiated to balance the load among the cells in the network. n load-based NC2 cell reselection, some MSs in cells with heavy load are reselected tocells with light load. n addition, the MSs in neighboring cells should not be reselected to these heavily-loaded cells. Figure 5-4 shows a load-based NC2 cell reselection. Figure 5-4 Load-based NC2 cell reselection

When the serving cell is overloaded and the receive level in this cell is lower than LOADRESELMAXRXLEV, load-based NC2 cell reselection is triggered. ! f the channel multiplexing rate of a cell is higher than LOADRESELSTARTTHRSH, the cell load is heavy. Then, the load-based NC2 cell reselection should be enabled. ! n a load-based NC2 cell reselection, only the MS whose signal level is lower than LOADRESELMAXRXLEV can be reselected to a neighboring cell. n load-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from the candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. Alternatively, the candidate WCDMA cell with the highest receive level is selected as the target cell. f NC2LoadResel is set to Support(Support), the characteristics information about a cell also includes the load of GSM candidate cells under the same BSC. n load-based NC2 cell reselection, a candidate cell must meet the following conditions: ! Receive level of the neighboring GSM cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST. ! Measured RSCP of the neighboring WCDMA cell > FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cells under the same BSC are not congested. ! When Service UTRAN CCO VaIue part is set to 010 or 001, none of the neighboring WCDMA cells can be selected as the candidate cell. Then, the highest level candidate cell within the highest priority cells is selected as the target cell. f a neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM to WCDMA is triggered. Coverage-Based NC2 CeII ReseIection AIgorithm Coverage-based NC2 cell reselection is activated when NORMALRESELALLOW is set to PERMIT(Permit). When none of the conditions for initiating a service-based, quality-based, and load-based NC2 cell reselection are met and the P/N criterion for initiating a coverage-based NC2 cell reselection is met, a coverage-based NC2 cell reselection is initiated. The P/N criterion for initiating a coverage-based NC2 cell reselection is as follows: n the period specified by RESELWATCHPERIOD, the number of times that the receive level of the serving cell is lower than the value of MINACCRXLEV reaches the value of RESELWORSENLEVTHRSH. n coverage-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from the candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. Or, the candidate WCDMA cell with the highest receive level is selected as the target cell. f NC2LoadResel is set to Support(Support), the characteristics information about a cell also includes the load of the GSM candidate cells under the same BSC. n coverage-based NC2 cell reselection, a candidate cell must meet the following conditions: ! Receive level of the neighboring GSM candidate cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST. ! Measured RSCP of the neighboring WCDMA candidate cell > FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cell under the same BSC are not congested. ! When Service UTRAN CCO VaIue part is set to 010 or 001, none of the neighboring WCDMA cells can be selected as the candidate cell. Then, the highest level candidate cell within the highest priority cells is selected as the target cell. f a neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM to WCDMA is triggered.

6 GSM/WCDMA Inter-RAT CS Handover GSM/WCDMA interoperability for MSs in dedicated mode involves GSM-to-WCDMA handover and WCDMA-to-GSM handover. Handovers are implemented by MSs and the BSS. GSM/WCDMA inter-RAT handovers include emergency handovers, better cell handovers, load-based inter-RAT handovers, and service-based inter-RAT handovers. Emergency handover is triggered when an ongoing call initiated by a multi-mode MS can no longer be processed in its serving cell due to limited network coverage or other factors. For example, when an MS making a call in the GSM cell edge is about to move outside the cell, an emergency handover is triggered to avoid call drops. For details, see the Handover Feature Parameter Description. Better cell handover is triggered when the signal quality of a neighboring cell is better than that of the serving cell. Better cell handovers help improve service quality and user experience. For example, when the signal quality of a WCDMA cell is better than that of the serving GSM cell, MSs in the serving cell can be handed over to theWCDMA cell to achieve higher voice quality. For details, see the Handover Feature Parameter Description. Load-based inter-RAT handover is triggered when the traffic load on the serving cell is too high. For a WCDMA-to-GSM load-based handover, if the traffic load on the targetGSM cell is also high, the target cell rejects the handover to avoid ping-pong handovers. Service-based handover allows an operator to use the MSC to choose a network for MSs. f the MSC indicates that a service-based handover should be performed on a call in a GSM cell, the BSS hands over the call to a WCDMA cell. f the MSC indicates that a call should not be handed over to a WCDMA call, the BSS does not hand over the call to a WCDMA cell when a handover is needed during the call. 6.1 CS Handover from WCDMA to GSM MSs in dedicated mode can be handed over from a WCDMA cell to a GSM cell. The handover decision and handover procedure are controlled by the RNC. The BSS considers the handover from WCDMA to GSM as a general inter-BSC handover. The handover from WCDMA to GSM is supported when INTERRATINBSCHOEN is set to YES(Yes). 6.2 CS Handover from GSM to WCDMA 6.2.1 Overview Handover from GSM to WCDMA is supported when INTERRATOUTBSCHOEN is set to YES(Yes). The BSS determines whether to initiate an inter-RAT handover from GSM to WCDMA. The process is as follows: 1. AnMSindedicatedmodeobtainstheneighboring WCDMA celllistandotherinformationfrom measurement information. 2. The MS reports the measurement result to the BSS through an MR. 3. After receiving the measurement result, the BSS determines whether to initiate a handover based on the measurement result and the handover algorithm. nter-RAT handover from GSM to WCDMA can be classified into emergency handover and better 3G cell handover. The algorithm for emergency handover from GSM toWCDMA is the same as that for general emergency handover. For details, see the Handover Feature Parameter Description. n the GSM network, the HOOPTSEL parameter specifies whether a GSM cell or a WCDMA cell is preferentially selected as the target cell. ! f HOOPTSEL is set to Pre_2G_CeII(Preference for 2G ceII), the BSC preferentially selects a GSM cell as the target cell. ! f HOOPTSEL is set to Pre_3G_CeII(Preference for 3G ceII), the BSC preferentially selects a WCDMA cell as the target cell. ! f HOOPTSEL is set to Pre_2G_CeIIThres(Preference 2G ceII by thresh), the BSC determines the target cell according to the receive level of the neighboring GSMcells and the value of HOPRETH2G. f the receive level of all neighboring GSM cells is lower than HOPRETH2G, the BSC selects a WCDMA cell as the target cell. Better 3G cell handover can be performed only when both INTERRATOUTBSCHOEN and BET3GHOEN are set to YES(Yes). As the measurement result of a WCDMA cell can be reported in the format of RSCP or Ec/No, the methods for handover decision differ accordingly. ! When the value of FDDREP is RSCP(RSCP), the better 3G cell handover is triggered if during HOSTAT3G, the following condition is met for the period specified byHODURT3G: CPCH RSCP > HORSCPTH3G ! When the value of FDDREP is EcN0(Ec/N0), the better 3G cell handover is triggered if the following condition is met for the period specified by HODURT3G withinHOSTAT3G: CPCH Ec/No > HOECNOTH3G 6.3 Service-Based CS Handover from GSM to WCDMA This section describes the feature GBFD-114321 GSM/WCDMA Load Based Handover. 6.3.1 Overview Operators can provide more diversified services when GSM and WCDMA coexist in a mixed network. Services of different types can be carried on different networks tooptimize the utilization of resources. For example, voice services and low-rate data services are carried on the GSM network, and high-rate data services are carried on theWCDMA network to allow high peak throughput. 6.3.2 Procedure f INTERRATOUTBSCHOEN is set to YES(Yes), the BSC applies different handover algorithms for MSs to be handed over from a GSM cell to a WCDMA cell according tothe setting of InterRatServiceLoadHoSwitch. ! f InterRatServiceLoadHoSwitch is set to CnService-based(CN Service-based), the BSC processes handovers according to the service handover attributes of the core network (CN) as follows: ! f the service handover indicator of the CN is Handover to UTRAN or cdma2000 shouId be performed, the MS should be handed over to a WCDMA cell. n this case, the BSC selects a WCDMA cell from the neighboring cell list as the target cell and starts the handover from GSM to WCDMA. ! f the service handover indicator of the CN is Handover to UTRAN or cdma2000 shouId not be performed, a GSM cell should be preferentially selected as the serving cell. n this case, the BSC does not start the handover from GSM to WCDMA. f a handover is required during the call, a GSM cell is preferentially selected as the target cell. ! f the service handover indicator of the CN is Handover to UTRAN or cdma2000 shaII not be performed, the MS must not be handed over to a WCDMA cell. n this case, the BSC will not hand over the MS to a WCDMA cell, and selects only a GSM cell as the target cell if a handover is required. ! f InterRatServiceLoadHoSwitch is set to Service-based(Service-based), the BSC removes the WCDMA candidate cell whose uplink/downlink traffic is in the minor congestion level. f the MS is performing a CS service, the MS accesses the current GSM cell. ! f InterRatServiceLoadHoSwitch is set to Load-based(Load-based) and the value of the E "Service Handover" in the ASSGNMENT REQUEST message sent from the CN is handover to UTRAN or cdma2000 shouId be performed, the BSC selects a neighboring WCDMA cell whose uplink and downlink loads meet the following condition from WCDMA candidate cells: G2GLoadAdjustCoeff x Load of the current GSM serving cell 10 x Load of the neighboring WCDMA cell < 10 x G2G3GLdBlcDeltaThrd 1000 f multiple neighboring WCDMA cells meet the preceding condition, the BSC starts the directed retry to the WCDMA cell with the highest receive quality. f no neighboringWCDMA cell meets the preceding condition, the BSC selects a GSM cell as the target cell. ! f there is no WCDMA candidate cell, or the directed retry to the WCDMA cell fails, the BSC starts the reassignment procedure to a GSM cell. ! When nterRatServiceLoadHoSwitch is set to Dynamic-based(Dynamic Service/Load-based):f the current cell has a normal load, the service-based WCDMA-to-GSMhandover algorithm is applied. f the current cell has a high load, the load-based WCDMA-to-GSM handover algorithm is applied. 6.4 Load-Based CS Handover from GSM to WCDMA This section describes the feature GBFD-114322 GSM/WCDMA Load Based Handover. 6.4.1 Overview n a mixed network where GSM and WCDMA coexist, MSs in connected mode can be handed over between GSM and WCDMA to balance the overall network load and enlarge system capacity. f the GSM cell that the MS camps on is congested, the BSC redirects the MS to the WCDMA network according to the load of the WCDMA network. 6.4.2 Procedure f both INTERRATOUTBSCHOEN and OutSysLoadHoEn are set to YES(Yes), the following conditions must be met to trigger the handover between GSM and WCDMA for MSs in connected mode: ! The flow control level of the current system is smaller than or equal to SYSFLOWLEV. ! The load on the serving cell is greater than or equal to TRIGTHRES. ! The Service Handover attribute of the service is not handover to UTRAN or cdma2000 shaII not be performed. A candidate WCDMA cell must meet the following conditions: ! G2GLoadAdjustCoeff x Load of the current GSM serving cell 10 x Load of the neighboring WCDMA cell < 10 x G2G3GLdBlcDeltaThrd 1000 ! For a WCDMA FDD cell, the following conditions must be met if FDDREP is set to RSCP(RSCP): ! InterRATLoadHoRSCPStart InterRATLoadHoRSCPBandWidth < CPCH RSCP < InterRATLoadHoRSCPStart! CPCH RSCP > IntRATLoadHORSCPThr ! For a WCDMA FDD cell, the following conditions must be met if FDDREP is set to EcN0(Ec/N0): ! InterRATLoadHoEcNoStart InterRATLoadHoEcNoBandWidth < CPCH Ec/No < InterRATLoadHoEcNoStart ! CPCH Ec/No > IntRATLoadHOEcNoThr Cells that do not meet the preceding conditions are removed from the candidate WCDMA cell list. f there are multiple cells in the candidate cell list, the BSC selects the cell with the highest receive level. 7 GSM/WCDMA Inter-RAT PS Handover This section describes the feature GBFD-119502 PS Handover Between GSM and WCDMA. PS handover is introduced in 3GPP Release 6. This feature involves WCDMA-to-GSM and GSM-to-WCDMA PS handovers. 7.1 WCDMA-to-GSM PS Handover 7.1.1 Overview WCDMA-to-GSM PS handovers are initiated by the RNC. PS handovers have two phases: handover preparation and handover execution. On the BSS side, the preparation and execution procedures for WCDMA-to-GSM PS handovers are the same as those for inter-BSC handovers in the GSM system. WCDMA-to-GSM PS handovers are supported when SPTINTERRATINBSCPSHO is set to SUPPORT(Support). 7.1.2 Procedure This section uses an inter-SGSN WCDMA-to-GSM PS handover as an example. The procedures for the intra-SGSN and inter-SGSN WCDMA-to-GSM PS handovers are similar. The only difference is that during intra-SGSN WCDMA-to-GSM PS handover, there is no inter-SGSN signaling interaction because the GSM cell and the WCDMA cell use the same SGSN. Figure 7-1 shows the signaling procedure during handover preparation. Figure 7-1 WCDMA-to-GSM PS handover preparation

1. The RNC makes the decision to perform a handover to a GSM cell. 2. The RNC sends a Relocation Required message to the 3G SGSN, with the E "Relocation Type" set to UE InvoIved in reIocation of SRNS. 3. The 3G SGSN checks the E "Target Cell dentifier" and determines that the handover is an inter-RAT handover. Then, the 3G SGSN sends a Forward Relocation Request message to the 2G SGSN of the target cell. 4. The 2G SGSN sends a PS Handover Request message to the BSS, requesting the BSS to reserve resources for the handover. The 2G SGSN then activates the PFC for the handover. 5. The BSS reserves resources and allocates a TBF for the handover based on the PFC. 6. The BSS creates the Target BSS to Source BSS Transparent Container, which contains the PS handover command. 7. The BSS responds to the 2G SGSN with a PS Handover Request Acknowledge message and is then ready to receive downlink data. 8. The 2G SGSN responds with a Forward Relocation Response message. The handover preparation is complete. Figure 7-2 shows the signaling procedure during handover execution. Figure 7-2 WCDMA-to-GSM PS handover execution

1. The 3G SGSN receives downlink data from the GGSN and sends the data to the MS through the RNC. 2. The 3G SGSN sends a Relocation Command message to the source RNC. 3. The RNC forwards packet data to the 2G SGSN through the 3G SGSN. 4. The RNC suspends uplink and downlink data transfer, and sends a Handover From UTRAN Command message to the MS. After receiving this message, the MS suspends the uplink data transmission. 5. The RNC sends a Forward SRNS Context (RAB contexts) message to the 2G SGSN through the 3G SGSN. Then, the 2G SGSN responds with a Forward SRNS Context Acknowledge message. 6. The MS executes the handover. n this step, the MS sends access bursts (ABs) to the target BSS and accesses the target GSM cell. Then, the MS receives the timing advance (TA) from the BSS. 7./7a. After accessing the cell, the MS processes the Non-Access Stratum (NAS) container and then sends an exchange identifier (XD) Response message to the 2G SGSNto resume the uplink data transfer. 8. After receiving the first correct RLC/MAC block, the BSS sends a PS Handover Complete message to inform the 2G SGSN that the handover is successful. The 2G SGSN then forwards uplink data to the GGSN. 9. After receiving the PS Handover Complete message, the 2G SGSN sends a Forward Relocation Complete message to inform the 3G SGSN that the handover is complete. The 3G SGSN then responds with a Forward Relocation Complete Acknowledge message. 10. The 2G SGSN sends an Update PDP Context Request message to the GGSN. The GGSN then updates the PDP context fields and returns an Update PDP Context Response message. From now on the GGSN sends new incoming downlink P packets to the 2G SGSN instead of to the 3G SGSN. 11. The 3G SGSN sends an u Release Command message to the RNC to release related resources. After sending all necessary data to the MS, the RNC returns an u Release Complete message to the 3G SGSN. 12./12a. The 2G SGSN may initiate LLC/SNDCP XD negotiation. 13. The MS starts the routing area update. The handover is complete. 7.2 GSM-to-WCDMA PS Handover 7.2.1 Overview The conditions for triggering GSM-to-WCDMA PS handovers are defined in the GSM system, and the handovers are initiated by the BSC. PS handovers have two phases: handover preparation and handover execution. Prerequisites The prerequisites for GSM-to-WCDMA PS handover are as follows: ! The MS supports PS handover. The radio access capability reported by the MS contains the PS handover field, which indicates that the MS supports PS handover. ! The BSC supports PS handover. The BSC supports PS handover when PSHOSUP is set to YES(Support), and SPTINTERRATOUTBSCPSHO is set to SUPPORT(Support). ! NACCSPT is set to YES(Yes) if NCO is set to NC0(NC0) or NC1(NC1) because NC0 and NC1 are based on NACC. ! NC2SPT is set to YES(Yes) if NCO is set to NC2(NC2). ! The SGSN supports PS handover. The BVC RESET and BVC RESET ACK messages sent over the Gb interface contain the Extended Feature Bitmap field, which specifies whether the Network Service Entity (NSE) supports PS handover: ! f the BVC RESET or BVC RESET ACK message sent by the SGSN does not contain the Extended Feature Bitmap field, or if the Extended Feature Bitmap field specifies that PS handover is not supported, none of the cells under the NSE of the SGSN support PS handover. That is, the source cell does not support PS handover. ! f the Extended Feature Bitmap field specifies that PS handover is supported, all cells under the NSE of the SGSN support PS handover. That is, the source cell supports PS handover. The BSC and the SGSN support the PFC procedure. PFCSUP is set to YES(Support). Trigger Conditions The triggering conditions for GSM-to-WCDMA PS handover vary according to the setting of NCO: ! When NCO is set to NC0(NC0) or NC1(NC1): NACCSPT is set to YES(Yes). The MS sends the BSC a PACKET CELL CHANGE NOTFCATON message, and target cell information contained in the message indicates that the target cell is a WCDMA cell. SPTINTERRATOUTBSCPSHO is set to SUPPORT(Support). ! When NCO is set to NC2(NC2): The MS sends the BSC an MR, and the BSC detects that the target cell is a WCDMA cell that uses the PS handover algorithm. SPTINTERRATOUTBSCPSHO is set toSUPPORT(Support). Handover AIgorithms GSM-to-WCDMA PS handover algorithms are classified into the service-based handover algorithm, quality-based handover algorithm, load-based handover algorithm, coverage-based handover algorithm. Each handover algorithm has the same triggering conditions and target cell selection mechanism as the corresponding NC2 cell reselection algorithm. For example, the service-based handover algorithm has the same triggering conditions and target cell selection mechanism as the service-based NC2 cell reselection algorithm. For detailed cell reselection algorithms, see section 5.2.3 "NC2 between GSM and WCDMA." 7.2.2 Procedure On the BSS side, the GSM-to-WCDMA PS handover procedure is similar to the inter-BSC PS handover procedure. The differences are as follows: ! The target cell is a WCDMA cell. ! The PS Handover Required message carries the Source BSC to Target RNC Transparent Container, which contains Es such as the MS radio access capability, paging mode, Global TF, and target cell S request. ! The PS Handover Required Acknowledge message carries the Source RNC to Target BSC Transparent Container, which contains Es such as the handover command and target cell S request. This section uses an inter-SGSN GSM-to-WCDMA PS handover as an example. The procedures for the intra-SGSN and inter-SGSN GSM-to-WCDMA PS handovers are similar. The only difference is that during intra-SGSN GSM-to-WCDMA PS handover, there is no inter-SGSN signaling interaction because the GSM cell and the WCDMA cell use the same SGSN. Figure 7-3 shows the signaling procedure during handover preparation. Figure 7-3 GSM-to-WCDMA PS handover preparation

1. The source BSS decides to initiate a PS handover to a WCDMA cell. At this point, both uplink and downlink user data is transmitted over the following: TBFs between the MS and the source BSS, BSSGP PFC tunnels between the source BSS and the 2G SGSN, GTP tunnels between the 2G SGSN and the GGSN. 2. The source BSS sends a PS Handover Required message, which carries the Target RNC dentifier information, to the 2G SGSN. 3. After detecting that the handover is an inter-RAT handover to WCDMA based on the Target RNC dentifier, the 2G SGSN sends a Forward Relocation Request messageto the 3G SGSN. 4. The 3G SGSN sends a Relocation Request message to request the target RNC to reserve resources in the target WCDMA cell. The target RNC responds with a Relocation Request Acknowledge message after resources are reserved in the target RNC. 6. The 3G SGSN sends a Forward Relocation Response message to the 2G SGSN. The handover preparation is complete. Figure 7-4 shows the signaling procedure during handover execution. Figure 7-4 GSM-to-WCDMA PS handover execution

1.The 2G SGSN continues to receive downlink and uplink user plane data. 2. After receiving a Forward Relocation Response message from the 3G SGSN, the 2G SGSN may forward downlink data to the target RNC through the 3G SGSN. The target RNC then sends the data to the MS over the air interface. 3. The2GSGSN continuesthePShandoverbysendinga PSHandoverRequiredAcknowledge message to the BSS. Before sending this message, the 2G SGSN, based on QoS, may suspend downlink data transfer for any PDP contexts. 4. The 2G SGSN forwards the GTP-U context to the target RNC. 5. TheBSSsendsaPSHandoverCommandmessagecontainingtheHandover to UTRAN Command message to the MS, instructing the MS to hand over to the targetWCDMA cell. 6. The MS accesses the WCDMA cell. 7. AfterdetectingthattheMShasaccessedthetargetcell,theRNCsendsaRelocationDetect message to the 3G SGSN. 8. The MS sends a Handover to UTRAN Complete message to the RNC. 9. WhenthenewsourceRNC-D+S-RNTaresuccessfullyexchangedwiththeMS,theRNC sends a Relocation Complete message to inform the 3G SGSN that the handover is complete. 10. The 3G SGSN sends a Forward Relocation Complete message to inform the 2G SGSN that the handover is complete and the reserved resources should be released. 11. The3GSGSNsendsanUpdatePDPContextRequestmessage to theGGSN. TheGGSN updates the PDP context fields. After the PDP context fields are updated, the GGSN sends new incoming downlink P packets to the 3G SGSN instead of to the 2G SGSN. 12. The 2G SGSN performs the PFC procedure to release the corresponding resources. 13. The MS updates the route area. The handover is complete. 8 ReIated Features FeaturePrerequisite FeatureMutuaIIy ExcIusive Feature Affected Feature GSM/WCDMAnteroperability NoneNone! When the GSM/WCDMAnteroperability feature is used with the GBFD-511403 Extended BCCH feature, the delay in a location update after WCDMA-to-GSM cell reselection decreases and the CS paging success rate increases. ! When the GSM/WCDMAnteroperability feature is used with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS can reselect a WCDMA cell after releasing a call in a GSM cell. This reduces the number of location updates and the duration for the MSto camp on the GSM cell, increases the CS paging success rate, and improves user experience. FeaturePrerequisite FeatureMutuaIIy ExcIusive Feature Affected Feature 2G/3G Cell Reselection Based on MS State NoneGBFD-116201 Network-Controlled Cell Reselection (NC2) ! When the 2G/3G Cell Reselection Based on MS State feature is used with the GBFD-511403 Extended BCCH feature, the delay in a location update after WCDMA-to-GSM cell reselection decreases and the CS paging success rate increases. ! When the 2G/3G Cell Reselection Based on MS State feature is used with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS can reselect a WCDMA cell after releasing a call in a GSM cell. This reduces the number of location updates and the duration for the MSto camp on the GSM cell, increases the CS paging success rate, and improves user experience. GSM/WCDMAService Based Handover GBFD-114301GSM/WCDMAnteroperability NoneNone GSM/WCDMALoad Based Handover GBFD-114301GSM/WCDMAnteroperability NoneNone Fast WCDMAReselection at 2G CS Call Release GBFD-114301GSM/WCDMAnteroperability NoneNone

9 Impact on the Network 9.1 GSM/WCDMA InteroperabiIity 9.1.1 Impact on System Capacity The GSM/WCDMA nteroperability feature allows MSs to hand over to WCDMA cells in areas covered by both GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks. 9.1.2 Impact on Network Performance n areas covered by both GSM and WCDMA networks, this feature allows MSs to hand over to WCDMA cells. This increases PS data rates. n areas are covered by only theGSM network, this feature allows MSs to hand over to GSM cells. This ensures service continuity. 9.2 GSM/WCDMA Service Based Handover 9.2.1 Impact on System Capacity The GSM/WCDMA Service Based Handover feature enables the CN to appropriately allocate services of different types to the GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks. With this feature, the CN allocates CS services and low-rate PS services to the GSM network and high-rate PS services to the WCDMA network. This maximizes the peak throughput. 9.2.2 Impact on Network Performance None 9.3 GSM/WCDMA Load Based Handover 9.3.1 Impact on System Capacity The GSM/WCDMA Load Based Handover feature allows MSs to handover from a GSM cell to a WCDMA cell when the GSM cell is congested. This balances the load between the GSM and WCDMA networks, improves the overall capacities of the GSM and WCDMA networks, and prevents the system from being overloaded. 9.3.2 Impact on Network Performance This feature decreases the congestion rate in GSM cells. 9.4 2G/3G CeII ReseIection Based on MS State 9.4.1 Impact on System Capacity The 2G/3G Cell Reselection Based on MS State feature allows MSs to reselect WCDMA cells in areas covered by both GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks. 9.4.2 Impact on Network Performance n areas covered by both GSM and WCDMA networks, this feature allows MSs to reselect WCDMA cells. This increases PS data rates. n areas are covered by only theGSM network, this feature allows MSs to reselect GSM cells. This ensures service continuity. 9.5 Fast WCDMA ReseIection at 2G CS CaII ReIease 9.5.1 Impact on System Capacity The Fast WCDMA Reselection at 2G CS Call Release feature reduces the duration for MSs to camp on GSM cells and decreases the number of times that the MSs initiate services in GSM cells. This increases the overall capacities of the GSM and WCDMA networks. 9.5.2 Impact on Network Performance This feature allows MSs to reselect WCDMA cells after releasing calls in GSM cells. This decreases the number of location updates and increases the CS paging success rate. 10 Engineering GuideIines 10.1 When to Use InteroperabiIity Between GSM and WCDMA 10.1.1 GSM/WCDMA InteroperabiIity t is recommended that the GSM/WCDMA nteroperability feature be used with the following function: ! Early classmark sending function: Set ECSC to YES(Yes) to enable this function. With this function, the BSC quickly determines whether MSs camping on a GSM cell are dual-mode MSs. 10.1.2 GSM/WCDMA Service Based Handover t is recommended that the GSM/WCDMA Service Based Handover feature be used in scenarios where both the GSM and WCDMA networks are covered and differentiated QoS is supported by CS and PS services. With this feature, PS services are preferentially processed in the WCDMA network, whereas CS services are still processed in theGSM network. 10.1.3 GSM/WCDMA Load Based Handover t is recommended that the GSM/WCDMA Load Based Handover feature be used in scenarios where both the GSM and WCDMA networks are covered and the GSMnetwork is overloaded. n coordination with the CN, this feature allocates CS services to the WCDMA network. This increases the resource usage of the WCDMA network, decreases the load and interference on the GSM network, and ensures the QoS of CS services. 10.1.4 2G/3G CeII ReseIection Based on MS State

When setting inter-RAT cell reselection parameters and handover thresholds, take note of the correlation between the GSM and TD-SCDMA parameters to prevent ping-pong cell reselections and handovers. t is recommended that the 2G/3G Cell Reselection Based on MS State feature be used with the following function: ! Early classmark sending function: Set ECSC to YES(Yes) to enable this function. With this function, the BSC quickly determines whether MSs camping on a GSM cell are dual-mode MSs. 10.1.5 Fast WCDMA ReseIection at 2G CS CaII ReIease None 10.2 Information to Be CoIIected 10.2.1 GSM/WCDMA InteroperabiIity Before deploying the GSM/WCDMA nteroperability feature, collect the following information: ! WCDMA network planning information: used for configuring neighboring cells. ! nteroperability policies for operators, such as the requirements for setting inter-RAT cell reselection parameters and whether GSM-to-WCDMA CS handover is required: used to properly set specific parameters and determine whether to enable specific functions. 10.2.2 GSM/WCDMA Service Based Handover Before deploying the GSM/WCDMA Service Based Handover feature, collect the following information: Whether the CN for GSM CS services supports GSM/WCDMA service-based handovers: used to determine whether this feature is allowed. 10.2.3 GSM/WCDMA Load Based Handover Before deploying the GSM/WCDMA Load Based Handover feature, collect the following information: Load information about GSM cells, such as TCH congestion rate and proportion of TCHHs to all TCHs in GSM cells: used to set parameters related to this feature. 10.2.4 2G/3G CeII ReseIection Based on MS State Before deploying the 2G/3G Cell Reselection Based on MS State feature, collect the following information: ! WCDMA network planning information: used for configuring neighboring cells. ! nteroperability policies for operators, such as the requirements for setting inter-RAT cell reselection parameters and whether GSM-to-WCDMA CS handover is required: used to properly set specific parameters and determine whether to enable specific functions. 10.2.5 2G/3G CeII ReseIection Based on MS State Before deploying the 2G/3G Cell Reselection Based on MS State feature, collect the following information: ! The proportion of WCDMA cells to all cells in specified areas ! Whether GSM/WCDMA dual-mode MSs are used 10.3 Network PIanning 10.3.1 GSM/WCDMA InteroperabiIity RF PIanning N/A Network TopoIogy For GSM cells to be enabled with the GSM/WCDMA nteroperability feature, plan neighboring cell configurations based on the topology of the adjacent WCDMA network. AGSM cell can be configured with a maximum of 64 neighboring WCDMA cells. These neighboring cells can use a maximum of three frequencies, with each frequency supporting a maximum of 32 neighboring WCDMA cells. Hardware PIanning N/A 10.3.2 GSM/WCDMA Service Based Handover RF PIanning N/A Network TopoIogy N/A Hardware PIanning N/A 10.3.3 GSM/WCDMA Load Based Handover RF PIanning N/A Network TopoIogy N/A Hardware PIanning N/A 10.3.4 2G/3G CeII ReseIection Based on MS State RF PIanning N/A Network TopoIogy N/A Hardware PIanning N/A 10.3.5 Fast WCDMA ReseIection at 2G CS CaII ReIease RF PIanning N/A Network TopoIogy N/A Hardware PIanning N/A 10.4 OveraII DepIoyment Procedure The GSM/WCDMA nteroperability and 2G/3G Cell Reselection Based on MS State features, which are basic features, need to be deployed preferentially. Other features are optional and can be enabled based on individual needs. 10.5 DepIoying GSM/WCDMA InteroperabiIity For details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Interoperability. 10.6 DepIoying 2G/3G CeII ReseIection Based on MS State For details about how to activate, verify, and deactivate this feature, see Configuring 2G/3G Cell Reselection Based on MS State. 10.7 DepIoying GSM/WCDMA Service Based Handover For details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Service Based Handover. 10.8 DepIoying GSM/WCDMA Load Based Handover For details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Load Based Handover. 10.9 DepIoying Fast WCDMA ReseIection at 2G CS CaII ReIease For details about how to activate, verify, and deactivate this feature, see Configuring the Fast WCDMA Reselection at 2G CS Call Release. 10.10 ReIated Parameters in the System Information GSM/WCDMA interoperability requires support from MSs. The radio access capability reported by an MS contains the PS handover field, which specifies whether the MS supports PS handover. After GSM/WCDMA interoperability is enabled, the early classmark sending function should be enabled so that MSs will report their support capabilities as early as possible. The early classmark sending function is enabled after ECSC is set to Yes. t is recommended that the value of SendUtranECSCFlag andCLASSMARKQUERY be set to YES. When setting inter-RAT cell reselection parameters and handover thresholds, take note of the correlation between the GSM parameters and WCDMA parameters to avoid ping-pong handovers. Telecom operators can control the cell reselection between GSM and WCDMA by setting parameters in the system information. For example, to allow MSs to access aWCDMA cell when available, it is recommended that QI be set to 7. n this manner, WCDMA cell search is always performed. The value of FDDQOFF has a great impact on cell reselection. To allow MSs to preferentially access a WCDMA cell, it is recommended that the value of FDDQOFF be changed and the actual offset be set to a negative value. When the value of FDDQOFF is smaller than 8, the corresponding actual offset is smaller than 0. 10.11 Neighboring WCDMA CeII Configuration To enable GSM/WCDMA interoperability, GSM cells must be configured with neighboring WCDMA cells. Neighboring WCDMA cells can be configured at the BSS by adding external WCDMA cells. To configure WCDMA cells at the BSS, set UTRANCELLTYPE to FDD. One GSM cell can be configured with a maximum of 64 neighboring WCDMAcells. Those cells can work in a maximum of three frequencies. Each frequency accommodates a maximum of 32 cells. 10.12 Iur-g Interface Between GSM and WCDMA A BSC can be connected to a maximum of 16 RNCs over the ur-g interface. nformation exchange is enabled when SPTINFOEXCHG is set to YES. After information exchange is enabled, set INFOEXCHGLIST to CELLCAPCLASS or NACCRELATED. 10.13 GSM/WCDMA Inter-RAT NC2 and GSM/WCDMA Inter-RAT PS Handover GSM/WCDMA inter-RAT PS handover requires support from the MS, RNC, BSC, and CN. NC2 is enabled when NCO is set to NC2. PS handover is supported when PSHOSUP is set to YES. After the PS handover is enabled: ! To enable the incoming GSM inter-RAT PS handover, set SPTINTERRATINBSCPSHO to SUPPORT. ! To enable the incoming WCDMA inter-RAT PS handover, set SPTINTERRATOUTBSCPSHO to SUPPORT. ! f NCO is set to NC0 or NC1, NACCSPT must be set to YES. ! f NCO is set to NC2, the BSC performs the PS handover decision based on measurement reports from the MS and indications from the SGSN. After NC2 and PS handover is enabled: ! To enable quality-based NC2 cell reselection and quality-based handover, set URGENTRESELALLOW to PERMIT. ! To enable load-based NC2 cell reselection and load-based handover, set LOADRESELALLOW to PERMIT. ! To enable coverage-based NC2 cell reselection and coverage-based handover, set NORMALRESELALLOW to PERMIT 10.14 Performance Optimization 10.14.1 GSM/WCDMA InteroperabiIity and 2G/3G CeII ReseIection Based on MS State Monitoring Monitor the number of allowed FDD calls to check whether the GSM/WCDMA nteroperability and 2G/3G Cell Reselection Based on MS State features need to be optimized. Parameter Optimization f the number of allowed FDD calls is great, MSs are likely to camp on GSM cells. n addition to optimizing WCDMA coverage, modify the settings of S-related parameters toincrease the possibility of GSM-to-WCDMA cell reselection. You are advised to set QI to 7 to ensure that MSs always search for 3G cells. n addition, you are advised to setFDDQMINOFFSET, FDDRSCPMIN, and FDDQMIN to small values, and FDDQOFF to a large value. 10.14.2 GSM/WCDMA Service Based Handover and GSM/WCDMA Load Based Handover Monitoring Monitor the inter-RAT outgoing cell handover success rate and call drop rate to check whether the GSM/WCDMA Service Based Handover and GSM/WCDMA Load Based Handover features need to be optimized. Parameter Optimization f the inter-RAT outgoing cell handover success rate is low, set RSCPOFF to a small value for increasing the number of candidate cells, and set HOSTAT3G to a large value for reducing the number of handovers. f the call drop rate is high, set ECNOOFF, HODURT3G, and TRIGTHRES to small values for accelerating handover decisions. 10.14.3 Fast WCDMA ReseIection at 2G CS CaII ReIease N/A 10.15 TroubIeshooting None 11 Parameters TabIe 11-1 Parameter description Parameter IDNEMML Command Feature ID Feature NameDescription BET3GHOENBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-114301 GBFD-114302 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability Meaning: This parameter specifies whether to allow 3G better cell handover algorithm. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None CELLRXQUALWORSENRATOTHRSH BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511303 Network-Controlled Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Quality Meaning: The number of times that the downlink transmission quality of the MS is lower than the transmission quality threshold of the MS ("EDGE GMSK Quality Threshold", "EDGE 8PSK Quality Threshold", or "GPRS Quality Threshold" by TBF type) is calculated accumulatively. When the rate of the accumulated value to the number of received measurement reports on the downlink transmission quality (Packet Downlink Ack/Nack message) is greater than or equal to the value of this parameter, the emergency reselection is triggered. GU Value Range: 0~100 Actual Value Range: 0~100 Default Value: 30 Unit: % CELLSELECTAFTERCALLREL BSC6900 SET GCELLCCAD(Optional) GBFD-114325 GBFD-511406 Fast WCDMAReselection at 2G CS Call Release Meaning: This parameter specifies whether to allow a mobile phone to preferentially camp on a 3G cell after a call is terminated in the areas covered by both Parameter IDNEMML Command Feature ID Feature NameDescription the GSM network and the UMTS network. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None CLASSMARKQUERY BSC6900 SET OTHSOFTPARA(Optional) GBFD-110501 GBFD-114302 Call Control GSM/TD-SCDMA nteroperability Meaning: Whether to enable the BSC to include the 3G classmark information element in the Classmark Request message that the BSC forwards from the MSC to an MS GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None DlLdrThrd2GCell BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: When the downlink load of a cell is larger than the value of this parameter and is smaller than "2G Cell DL Overload Congest Thred", the downlink of the cell is in the basic congestion status. GU Value Range: 1~100 Actual Value Range: 1~100 Default Value: 90 Unit: None DlOlcThrd2GCell BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: When the downlink load of a cell is greater than the value, the downlink of the cell is in the overload congestion status. GU Value Range: 1~100 Actual Value Range: 1~100 Default Value: 100 Unit: None Parameter IDNEMML Command Feature ID Feature NameDescription ECNOOFFBSC6900 ADD G3GNCELL(Optional) MOD G3GNCELL(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: As a performance counter for 3G cells, Ec/No indicates the ratio of the energy per received chip to the spectral noise power density. f the Ec/No of a 3G neighbor cell is greater than "HOECNOTH3G" plus this parameter, the neighbor cell is listed in the candidate cell queue. GU Value Range: 0~49 Actual Value Range: 0~49 Default Value: 3 Unit: dB ECSCBSC6900 SET GCELLCCBASC(Optional) GBFD-111101 GBFD-114302 System nformation Sending GSM/TD-SCDMA nteroperability Meaning: The early classmark sending control (ECSC) parameter specifies whether the MSs in a cell use early classmark sending. After a successful immediate assignment, the MS sends additional classmark information to the network as early as possible. The additional classmark information mainly contains the CM3 (classmark 3) information. The CM3 (classmark 3) information contains the frequency band support capability of the MS (used for the future channel assignment), power information about each frequency band supported by the MS (used for the handover between different frequency bands), and encryption capability of the MS. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Parameter IDNEMML Command Feature ID Feature NameDescription Default Value: YES Unit: None FDDCELLOFFBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Offset of a FDD cell report. When the priority of a 3G cell is sequenced, the value of this parameter be added to the receive level of the 3G cell in the measurement report. The values of this parameter correspond to the following decibel values: 0: 0 dB 1: 6 dB ... 7: 42 dB GU Value Range: 0~7 Actual Value Range: 0~42 Default Value: 0 Unit: 6dB FDDCELLTHRED BSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Threshold of a FDD cell report. When the receive level value in the measurement report of a 3G cell exceeds the value of this parameter, the measurement report takes effect. After the valid measurement report is filtered, the 3G cell joins the cell priority sequence. The values of this parameter correspond to the following decibel values: 0: 0 dB 1: 6 dB ... 6: 36 dB 7: positive infinity GU Value Range: 0~7 Parameter IDNEMML Command Feature ID Feature NameDescription Actual Value Range: 0~36, Positive infinity Default Value: 0 Unit: 6dB FDDFREQCNUM BSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Number of UTRAN FDD cells that should be included in measurement report GU Value Range: 0~3 Actual Value Range: 0~3 Default Value: 2 Unit: None FDDQMNBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: This parameter specifies one of the parameters for FDD cell reselection. A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds: 1.Receive level of the FDD cell > Average receive level of the current serving cell + "FDD Q offset"; The FDD cell meets the following condition in the case of any neighboring 2G cell:Receive level of the FDD cell > Receive level of any neighboring 2G cell + "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD Qmin Offset"; 3. Receive level of the FDD cell >"RSCP Threshold"; f multiple FDD cells meet the preceding conditions, the MS reselects the cell with the strongest receive level. See 3GPP TSs 45.008 and 25.304. The values of this parameter Parameter IDNEMML Command Feature ID Feature NameDescription correspond to the following decibel values: 0: -20 dB, 1: -6 dB, 2: -18 dB, 3: -8 dB, 4: -16 dB, 5: -10 dB, 6: -14 dB, 7: -12 dB. GU Value Range: 0~7 Actual Value Range: -20, -6, -18, -8, -16, -10, -14, -12 Default Value: 0 Unit: dB FDDQMNOFFSET BSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Offset of the minimum threshold for Ec/No during a FDD cell reselection. A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds: 1.Receive level of the FDD cell > Average receive level of the current serving cell + "FDD Q offset"; The FDD cell meets the following condition in the case of any neighboring 2G cell:Receive level of the FDD cell > Receive level of any neighboring 2G cell + "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD Qmin Offset"; 3. Receive level of the FDD cell >"RSCP Threshold"; f multiple FDD cells meet the preceding conditions, the MS reselects the cell with the strongest receive level. Parameter IDNEMML Command Feature ID Feature NameDescription See 3GPP TSs 45.008 and 25.304. GU Value Range: 0~7 Actual Value Range: 0~7 Default Value: 0 Unit: dB FDDQOFFBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: This parameter specifies one of the thresholds of the signal level for 3G cell reselection. A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds: 1.Receive level of the FDD cell > Average receive level of the current serving cell + "FDD Q offset"; The FDD cell meets the following condition in the case of any neighboring 2G cell:Receive level of the FDD cell > Receive level of any neighboring 2G cell + "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD Qmin Offset"; 3. Receive level of the FDD cell >"RSCP Threshold"; f multiple FDD cells meet the preceding conditions, the MS reselects the cell with the strongest receive level. See 3GPP TSs 45.008 and 25.304. The values of this parameter correspond to the following decibel values: 0: - (always select a cell if acceptable) 1: -28 dB, 2: -24 dB, Parameter IDNEMML Command Feature ID Feature NameDescription ... 15: 28 dB. GU Value Range: 0~15 Actual Value Range: Negative infinity, -28~28 Default Value: 8 Unit: 4dB FDDREPBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GBFD-110801 GBFD-110802 GSM/WCDMAnteroperability Processing of Measurement Report Pre-processing of Measurement Report Meaning: This parameter specifies whether Ec/No or RSCP is used for the measurement report on a FDD cell. Ec/No stands for the signal-to-noise ratio. RSCP stands for the received signal code power. GU Value Range: RSCP(RSCP), EcN0(Ec/N0) Actual Value Range: RSCP, EcN0 Default Value: RSCP Unit: None FDDRSCPMNBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Minimum level threshold of UTRAN cell reselection. During the cell reselection decision from a GSM cell to a FDD cell, this parameter is used to calculate the RSCP threshold of the target cell. A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds: 1.Receive level of the FDD cell > Average receive level of the current serving cell + "FDD Q offset"; The FDD cell meets the following condition in the case of any neighboring 2G cell:Receive level of the FDD cell Parameter IDNEMML Command Feature ID Feature NameDescription > Receive level of any neighboring 2G cell + "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD Qmin Offset"; 3. Receive level of the FDD cell >"RSCP Threshold"; f multiple FDD cells meet the preceding conditions, the MS reselects the cell with the strongest receive level. See 3GPP TSs 45.008 and 25.304. The values of this parameter correspond to the following decibel values: 0 = -114 dBm, 1 = -112 dBm, 2 = -110 dBm, ... 14 = -86 dBm, 15 = -84 dBm. GU Value Range: 0~15 Actual Value Range: -114~-84 Default Value: 6 Unit: 2dBm FDDRSCPQUALTHRSH BSC6900 ADD GEXT3GCELL(Optional) MOD GEXT3GCELL(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: Minimum RSCP of the 3G FDD cell candidate GU Value Range: 0~63 Actual Value Range: 0~63 Default Value: 10 Unit: None G2G3GLdBlcDeltaThrd BSC6900 SET OTHSOFTPARA(Optional) GBFD-511103 GBFD-511408 GSM andWCDMA Load Balancing Based on ur-g Meaning: Use this parameter to set Load difference threshold for load-based handovers between GSMand UMTS. f the load balance between a Parameter IDNEMML Command Feature ID Feature NameDescription 2G cell and a 3G cell is greater than the threshold, load balance istriggered. GU Value Range: 0~200 Actual Value Range: -100~100 Default Value: 110 Unit: % G2GLoadAdjustCoeff BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Coefficient used to modulate the load level of a 2G system so that the load level of the 2G system can be compared with that of a 3G system. GU Value Range: 0~100 Actual Value Range: 0~100 Default Value: 10 Unit: None HODURT3GBSC6900 ADD G3GNCELL(Optional) MOD G3GNCELL(Optional) GBFD-110601 GBFD-510501 HUAWE Handover HUAWE Handover Meaning: According to the P/N rule, if the conditions for the handover to a better 3G cell are met for P seconds within N seconds, the handover is triggered. This parameter specifies the number P. GU Value Range: 1~32 Actual Value Range: 0.5~16 Default Value: 8 Unit: 0.5s HOECNOTH3GBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-114301 GSM/WCDMAnteroperability Meaning: The 3G better cell handover can betriggered only when the Ec/No of a neighboring 3G cell is greater than this threshold for a period of time. GU Value Range: 0~49 Actual Value Range: 0~49 Default Value: 35 Unit: dB Parameter IDNEMML Command Feature ID Feature NameDescription HOOPTSELBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-110601 GBFD-510501 GBFD-114301 GBFD-114302 HUAWE Handover HUAWE Handover GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability Meaning: This parameter specifies whether a 2G cell or to a 3G cell is preferentially selected as the target cell for handover. When this parameter is setto Pre_2G_Cell, the BSC preferentially selects a 2G candidate cell as the target cell for handover. When this parameter is set to Pre_3G_Cell, the BSC preferentially selects a 3G candidate cell as the target cell for handover. When this parameter is set to Pre_2G_CellThres, the BSC preferentially selects a neighboring 3G cell as the handover target cell if the receive level of the neighboring 2G cell that ranks the first in the candidate cell list is equal to or smaller than "HO Preference Threshold for 2G Cell". Otherwise, the BSC preferentially selects a neighboring 2G cell as the handover target cell. GU Value Range: Pre_2G_Cell(Preference for 2G cell), Pre_3G_Cell(Preference for 3G cell), Pre_2G_CellThres(Preference 2G cell by thresh) Actual Value Range: Pre_2G_Cell, Pre_3G_Cell, Pre_2G_CellThres Default Value: Pre_2G_CellThres Unit: None HOPRETH2GBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-110601 GBFD-510501 HUAWE Handover HUAWE Handover GSM/WCDMAnteroperability Meaning: f the receive level of the neighboring 2G cell that ranks the first in the candidate cell list is equal to or smaller than this Parameter IDNEMML Command Feature ID Feature NameDescription GBFD-114301 GBFD-114302 GSM/TD-SCDMA nteroperability threshold, the BSC preferentially selects a neighboring 3G cell as the handover target cell. Otherwise, the BSC preferentially selectsa neighboring 2G cell as the handover target cell. GU Value Range: 0~63 Actual Value Range: 0~63 Default Value: 25 Unit: dB HORSCPTH3GBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-114301 GBFD-114302 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability Meaning: The 3G better cell handover is triggeredonly when the RSCP of a neighboring 3G cell is greater than this threshold for a period of time. GU Value Range: 0~63 Actual Value Range: 0~63 Default Value: 50 Unit: dB HOSTAT3GBSC6900 ADD G3GNCELL(Optional) MOD G3GNCELL(Optional) GBFD-110601 GBFD-510501 HUAWE Handover HUAWE Handover Meaning: According to the P/N rule, if the conditions for the handover to a better 3G cell are met in P of N measurement reports, the handover istriggered. This parameter specifies the number N. GU Value Range: 1~32 Actual Value Range: 0.5~16 Default Value: 10 Unit: 0.5s NFOEXCHGLST BSC6900 ADD GNRNC(Mandatory) MOD GNRNC(Mandatory) MRFD-211402 GBFD-511102 GBFD-511402 MBSC Load Balancing NACC Procedure Optimization Based on ur-g between GSMand WCDMA Radio Resource Reserved Handover BetweenGSM/TD-SCDMA Based on ur-g Meaning: nformation exchange content to be supported GU Value Range: CELLCAPCLASS(Cell Capacity nfo), NACCRELATED(NACC nfo) Actual Value Range: Parameter IDNEMML Command Feature ID Feature NameDescription CELLCAPCLASS, NACCRELATED Default Value: CELLCAPCLASS Unit: None NTERRATCELLRESELEN BSC6900 SET GCELLHOBASC(Optional) GBFD-511104 GBFD-114302 GSM andWCDMATraffic Steering Based on ur-g GSM/TD-SCDMA nteroperability Meaning: This parameter specifies whether the reselection from 2G cells to 3G cells is allowed. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None NTERRATNBSCHOEN BSC6900 SET GCELLHOBASC(Optional) GBFD-114301 GBFD-114302 GBFD-511103 GBFD-511402 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability GSM andWCDMA Load Balancing Based on ur-g Radio Resource Reserved Handover BetweenGSM/TD-SCDMA Based on ur-g Meaning: This parameter specifies whether the handover from 3G cells to 2G cells is allowed. When this parameter is set to NO, the parameter is invalid if the source cell identifier contained in a 3G-to-2G cell handover request is CG (not SA). GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None NTERRATOUTBSCHOEN BSC6900 SET GCELLHOBASC(Optional) GBFD-114301 GBFD-114302 GBFD-511103 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability GSM andWCDMA Load Balancing Based on ur-g Meaning: This parameter specifies whether the handover from 2G cells to 3G cells is allowed. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None Parameter IDNEMML Command Feature ID Feature NameDescription ntRATLoadHOEcNoThr BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Minimum Ec/No value of a 3G cell during the load-based GSM-to-UMTS handover GU Value Range: 0~49 Actual Value Range: 0~49 Default Value: 25 Unit: dB ntRATLoadHORSCPThr BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Minimum RSCP value of a 3G cell during the load-based GSM-to-UMTS handover GU Value Range: 0~91 Actual Value Range: 0~91 Default Value: 30 Unit: dB nterRATLoadHoEcNoBandWidth BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Width of load band [EcNo] during the inter-RAT hierarchical load-based handover GU Value Range: 1~49 Actual Value Range: 1~49 Default Value: 20 Unit: dB nterRATLoadHoEcNoStart BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: nitial EcNo value of the inter-RAT load-based handover band GU Value Range: 0~49 Actual Value Range: 0~49 Default Value: 49 Unit: dB nterRATLoadHoRSCPBandWidth BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Width of load band [RSCP] during the inter-RAT hierarchical load-based handover GU Value Range: 1~91 Actual Value Range: 1~91 Default Value: 60 Unit: dB Parameter IDNEMML Command Feature ID Feature NameDescription nterRATLoadHoRSCPStart BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: nitial RSCP value of the inter-RAT load-based handover band GU Value Range: 0~91 Actual Value Range: 0~91 Default Value: 91 Unit: dB nterRatCsServiceLoadHoThrd BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning: Threshold for setting the flag of accepting inter-RAT CS service handover of a 2G cell GU Value Range: 1~100 Actual Value Range: 1~100 Default Value: 80 Unit: None nterRatServiceLoadHoSwitch BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GBFD-511407 GBFD-511408 GBFD-511104 GSM andWCDMA Load Balancing Based on ur-g GSM andWCDMATraffic Steering Based on ur-g Meaning: When this parameter is set to Service-based, the inter-RAT handover is triggered on the basis of the service distribution. n this case, the target cell is selected this parameter is set to Load-based, the inter-RAT handover is triggered on the basis of the load balance. n this case, the target cell is selected according to the traffic load on the target cell and the load difference between 2G and 3G cells. When this parameter is set to Dynamic Service/Load based, the target cell is dynamically selected by using the service-based algorithm or the load-based algorithm according to the traffic load on the cell. When this parameter is set to CN Service-based, the inter-RAT handover decision is made on the basis of the service attribute of the core Parameter IDNEMML Command Feature ID Feature NameDescription network. When this parameter is set to OFF, no inter-RAT service handover or inter-RAT load handover in the access state is performed. GU Value Range: Service-based(Service-based), Load-based(Load-based), Dynamic-based(Dynamic Service/Load-based), CnService-based(CN Service-based), OFF(OFF) Actual Value Range: Service-based, Load-based, Dynamic-based, CnService-based, OFF Default Value: OFF Unit: None LOADRESELALLOW BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511304 GBFD-511307 Network-Controlled Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Cell Load eNC2 BetweenGSM and LTE Meaning: Whether to allow the cell load reselection. f this parameter is set to PERMT and "NC2 Load Reselection Switch" is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection. GU Value Range: FORBD(Forbid), PERMT(Permit) Actual Value Range: FORBD, PERMT Default Value: PERMT Unit: None LOADRESELMAXRXLEV BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511304 Network-Controlled Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Cell Load Meaning: Threshold for allowing the MS to reselect a cell during load reelection. When the receive level of the serving cell is lower than this threshold, the load reselection is triggered. GU Value Range: 0~63 Parameter IDNEMML Command Feature ID Feature NameDescription Actual Value Range: 0~63 Default Value: 40 Unit: None LOADRESELRXTHRSH BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-114301 GBFD-114322 GBFD-511304 GBFD-511310 Network-Controlled Cell Reselection (NC2) GSM/WCDMAnteroperability GSM/WCDMALoad Based Handover PS Handover Between GSMand LTE Based on Cell Load Multi Technology Neighbour Cell Based Handover Meaning: When the uplink load or downlink load of the target cell is lower than this threshold, it can accept the MSs from the serving cell due to load reselection. GU Value Range: 0~100 Actual Value Range: 0~100 Default Value: 60 Unit: % LOADRESELSTARTTHRSH BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511304 Network-Controlled Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Cell Load Meaning: When the uplink load or downlink load of the cell exceeds this threshold, the load reselection decision is made. GU Value Range: 0~100 Actual Value Range: 0~100 Default Value: 85 Unit: % MNACCRXLEVBSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511302 GBFD-511303 GBFD-511304 GBFD-511306 Network-Controlled Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Coverage PS Handover Between GSMand LTE Based on Quality PS Handover Between GSMand LTE Based on Cell Load GSM/LTE Service Based PS Handover Meaning: Minimum receive level for a neighbor cellto become a candidate cell during cell reselection. When the receive level of the serving cell is lower than the value of this parameter, it indicates that the normal cell reselection level is bad. n this case, the parameter value is used for the calculation of the times of the occurrence of bad normal cell reselection level. GU Value Range: 0~63 Actual Value Range: 0~63 Default Value: 15 Unit: None Parameter IDNEMML Command Feature ID Feature NameDescription NACCSPTBSC6900 SET GCELLGPRS(Optional) GBFD-116301 GBFD-119502 Network Assisted Cell Change (NACC) PS Handover Meaning: Whether to support Network Assisted Cell Change (NACC). NACC is used in the network control mode NC0, NC1 or NC2. When an MS is in packet transfer mode, the NACC enables the network to notify the MS in advance of the system information about neighboring cells, accelerating cell reselection for MSs. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO Unit: None NC2LoadReselBSC6900 SET BSCPSSOFTPARA(Optional) GBFD-116201 Network-Controlled Cell Reselection (NC2) Meaning: Whether to involve the load of the target cell in the algorithm for NC2 cell reselection. f this parameter is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection. GU Value Range: NotSupport(Not Support), Support(Support) Actual Value Range: NOTSUPPORT, SUPPORT Default Value: NOTSUPPORT Unit: None NC2SPTBSC