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FEMTO Parameter User Guide BCR2.1
Document number: UMT/IRC/DD/024270Document issue: 01.01 / ENDocument status: DraftDate: 26/May/2008
INTERNAL Document
Passing on or copying of this document, use and communication of its contents notpermitted without AlcatelLucent written authorization
Copyright!2008 Alcatel-Lucent, All Rights Reserved
Printed in France
UNCONTROLLED COPY: The master of this document is stored on an electronic database and is write
protected; it may be altered only by authorized persons. While copies may be printed, it is not recommended.
Viewing of the master electronically ensures access to the current issue. Any hardcopies taken must be regarded
as uncontrolled copies.
ALCATEL-LUCENT CONFIDENTIAL: The information contained in this document is the property of Alcatel-
Lucent. Except as expressly authorized in writing by Alcatel-Lucent, the holder shall keep all information
contained herein confidential, shall disclose the information only to its employees with a need to know, and shall
protect the information from disclosure and dissemination to third parties. Except as expressly authorized in
writing by Alcatel-Lucent, the holder is granted no rights to use the information contained herein. If you have
received this document in error, please notify the sender and destroy it immediately.
BSR - Base Station Router
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CONTENTS
1.
INTRODUCTION............................................................................................................................5
1.1. OBJECT....................................................................................................................................5
1.2. SCOPE OF THE DOCUMENT ........................................................................................................5
1.3. NOMENCLATURE.......................................................................................................................6
2. RELATED DOCUMENTS..............................................................................................................8
2.1. 3GPPREFERENCE DOCUMENTS ...............................................................................................8
2.2. ALCATEL-LUCENT REFERENCE DOCUMENTS ..............................................................................8
3.
BSR OAM MODEL ........................................................................................................................9
4. POWER CONTROL.....................................................................................................................10
4.1. POWER SETTING ....................................................................................................................10
4.1.1 Initial CPICH Power ......................................................................................................104.1.2 Updating CPICH Power ................................................................................................104.1.2.1 CPICH Power update based on Coverage................................................................114.1.2.2 CPICH Power update based on UE receiver range ..................................................134.1.2.3 CPICH Power update based on UE measurements .................................................144.1.3 Maximum BSR Tx Power..............................................................................................164.1.4 Other DL Common Channel Power setting...................................................................16
5.
RADIO RESSOURCE MANAGEMENT.......................................................................................19
5.1. CALL ADMISSION CONTROL.....................................................................................................19
5.1.1 Emergency Call redirection...........................................................................................195.1.2 Processing CAC............................................................................................................195.1.3 Rejecting RRC Connection ...........................................................................................22
5.2. DYNAMIC BEARER CONTROL ...................................................................................................22
5.2.1 DBC based on UL & DL Load measurement ................................................................225.2.2 DBC based on Baseband processing limitation............................................................25
5.3. AIR INTERFACE CONGESTION CONTROL...................................................................................26
6.
MOBILITY MANAGEMENT.........................................................................................................27
6.1. CELL RESERVATION AND ACCESS RESTRICTION.......................................................................27
6.2. NEIGHBOURHOOD DEFINITION .................................................................................................28
6.2.1 3G Macro neighbourhood .............................................................................................286.2.2 GSM Macro neighbourhood..........................................................................................32
6.3. CELL RESELECTION ................................................................................................................34
6.3.1 Cell Reselection Measurement Rules...........................................................................366.3.1.1 Intra-frequency measurements .................................................................................376.3.1.2 Inter-frequency measurements .................................................................................376.3.1.3 Inter-RAT measurements ..........................................................................................386.3.1.4 Measurement Triggers Parameters...........................................................................38
6.3.2
Cell Eligibility Criteria ....................................................................................................406.3.2.1 3G Neighbouring Cell Criteria ...................................................................................42
6.3.2.2 GSM Neighbouring Cell Criteria ................................................................................43
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6.3.3 Cell Reselection Ranking Criterion ............................................................................456.3.3.1 First Ranking .............................................................................................................466.3.3.2 Second Ranking ........................................................................................................476.3.3.3 Target Cell Selection .................................................................................................48
6.4. HARD HANDOVER ...................................................................................................................50
6.4.1
Eligibility for Handover ..................................................................................................50
6.4.2 Detecting Radio Degradation........................................................................................516.4.3 Handover Execution......................................................................................................55
7. INDEXES......................................................................................................................................58
7.1. TABLE INDEX ..........................................................................................................................58
7.2. FIGURE INDEX ........................................................................................................................58
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1. INTRODUCTION
1.1. OBJECT
The FEMTO Parameter User Guide (FPUG) document provides parameter setting
recommendation from Alcatel-Lucents experience, coming from studies, simulations
and experimentations. It gives the rationale of these settings by describing Alcatel-
Lucents FEMTO BSR algorithms and parameters from an engineering point of view. It
also gives some engineering rules related to parameter settings.
The FPUG does not contain the complete list of configuration parameters; the
parameters described in this document are only customer configuration parameters
accessible by the customer (operator) via the MMI of the OMC.
In the case where the recommended values of the FPUG are different from any other
document, the FPUG recommendation should prevail.
1.2. SCOPE OF THE DOCUMENT
The FPUG describes the features and the associated parameters which represent the
salient functions available within Alcatel-lucent BSR FEMTO solution, based on
BCR2.1 Phase 5.
The relevant features are listed in the following table.
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Category Feature ID Feature Title Basic/Option
34586 Dynamic Bearer Control Basic
34596 Active call redirect from BSR FEMTO to Macro Basic
34527 Pre-emption process for emergency call Basic
36217 CAC on backhaul resources Basic
75103 Emergency call redirection to the Macro network Basic
34526 Air Interface Congestion control Basic
34528 Power control Basic
RRM
74769 Voice Prioritisation over Data Basic
34529
Cell Reselection to/from macro layer (2G or 3G, intra/inter
frequency)
Basic
34530 Handover BSR FEMTO to Macro 3G Option
34531 Handover BSR FEMTO to Macro 2G Option
34535 BSR FEMTO auto-configuration Basic
34536 BSR FEMTO self-optimisation Basic
Mobility
34537 3G Network Listening Basic
1.3. NOMENCLATURE
In this document, BSR stands for BSR FEMTO.
The parameter names are written in bold italic.
The objects names are written in bold.
The parameters properties are presented as follow:
Parameter
Object
Granularity
Range & Unit
Class
Value
Note: the information fields Parameter, Object, Range & Unit, and User & Class
are based on External
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The protocol messages are written in CAPITAL LETTERS.
The Information Elements (IE) contained in the protocol messages are written the
following way: TPC_DL_Step_Size.
The data fill rules (non negotiable) are presented as the following. These are
typically OAM checks performed on parameters settings (structure of table, range,
etc)
Rule:
The system restrictions are presented as the following. Typically when the
behaviour of product is not as specified (e.g. parameters not used by algorithm)
Restriction:
The engineering recommendations on parameter value are presented as the
following. These are recommendations related to performance (QoS, Capacity,
KPI) to get the best of the network.
Engineering Recommendation:
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2. RELATED DOCUMENTS
2.1. 3GPP REFERENCE DOCUMENTS
[3GPP_R01] 3GPP TS 25.304 UE procedures in Idle mode and procedures for cell
reselection in connected mode
[3GPP_R02] 3GPP TS 25.331 Radio Resource Control (RRC); protocol specification
[3GPP_R03] GSM TS 05-05 Radio Transmission and Reception
2.2. ALCATEL-LUCENT REFERENCE DOCUMENTS
[R01] NTP 411-8111-813 Access Network Parameters
[R02] UMT/SYS/INF/023452 BSR FEMTO Feature Planning Guide BCR2.1
[R03] SRD-FBSR-RRM Radio Resource Management System Requirements
Document
[R04] SRD-BSR-POW Power Control System Requirements Document
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3. BSR OAM MODEL
The following figure depicts, within the BSR OAM Model, the location of all the
parameters that are presented in this document.
Figure 1: BSR OAM Model
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4. POWER CONTROL
4.1. POWER SETTING
4.1.1 INITIAL CPICH POWER
During auto-configuration phase, BSR uses autoConfigPWpCPICHPowerIni as the
initial CPICH power.
Parameter autoConfigPWpCPICHPowerIni
Object BSRProfile
Granularity BSR Profile
Range & Unit Float (dBm)
[-3020] step 0.1
Class Class 3
Value -10
4.1.2 UPDATING CPICH POWER
The following sections define the different algorithms that aim at updating CPICH
power which always remain within its range, defined by the 2 following parameters,
autoConfigPWminPilotPowerdBmand autoConfigPWmaxPilotPowerdBm.
Parameter autoConfigPWminPilotPowerdBm
Object BSRProfile
Granularity BSR Profile
Range & Unit Float (dBm)
[-3024] step 0.1
Class Class 3Value -10
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Parameter autoConfigPWmaxPilotPowerdBm
Object BSRProfile
Granularity BSR Profile
Range & Unit Float (dBm)
[-3024] step 0.1
Class Class 3
Value 3
Cf. recommendation hereafter
Engineering Recommendation: autoConfigPWmaxPilotPowerdBm
Keeping in mind that MaxBSRPowerdBm is 10 dB higher than CPICH power (cf. section 4.1.3), it is
recommended to set autoConfigPWmaxPilotPowerdBm 10 dB lower than
maxBSRPowerLimitdBm, i.e. 3 dB.
4.1.2.1 CPICH POWER UPDATE BASED ON COVERAGE
The dynamic setting of CPICH power is enabled through
bsrBasedPilotPowerAdjustModeparameter.
Parameter bsrBasedPilotPowerAdjustMode
Object BSRProfile
Granularity BSR Profile
Range & Unit Enumerated (ms)
{disable, ecIoBased}
Class Class 3
Value ecIoBased
When set to disable, BSR uses pCPICHPower as the static CPICH power.
Parameter pCPICHPower
Object LCell
Granularity BSR Profile
Range & Unit Float (dBm)
[-3020] step 0.1
Class Class 3
Value -10
When set to ecIoBased, BSR dynamically adjusts CPICH power using the following
formula:
CPICHpower[new]= autoConfigPWtargetPilotEcIodB+ IodBm + MaximumPathLoss
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where:
IodBm is the average UTRA RSSI (converted in dBm) measured during the
network listening period (autoConfigPWBsrBasedPilotPowerAdjustIntervalseconds)
MaximumPathLoss=FreeSpacePathloss+ autoConfigPWindoorPenetrationLoss
o FreeSpacePathloss= 20*log10(DL_frequencyMHz) +
20*log10(autoConfigPWmaxCoverageDistancem) 27.5582
Refer to [R04] for further explanations on these formulas.
Parameter autoConfigPWtargetPilotEcIodBObject BSRProfile
Granularity BSR Profile
Range & Unit Float (dB)
[-250] step 0.1
Class Class 3
Value -14
autoConfigPWindoorPenetrationLoss is used to control the minimum BSR pilot
coverage, in order to maintain the BSR's minimum coverage.
Parameter autoConfigPWindoorPenetrationLoss
Object BSRProfile
Granularity BSR Profile
Range & Unit Integer (dB)
[0100]
Class Class 3
Value Cf. recommendation hereafter
autoConfigPWmaxCoverageDistancem is used to adjust the BSR coverage
within the limit set by autoConfigPWmaxPilotPowerdBm.
Parameter autoConfigPWmaxCoverageDistancem
Object BSRProfile
Granularity BSR Profile
Range & Unit Integer (m)
[1200]
Class Class 3
Value Cf. recommendation hereafter
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Engineering Recommendation: autoConfigPWindoorPenetrationLoss and
autoConfigPWmaxCoverageDistancem
For initial deployment, it is recommended that the operator setup a few profiles for typical residential
property types, such as farm house, city house and apartment flat
Parameter autoConfigPWBsrBasedPilotPowerAdjustInterval
Object BSRProfile
Granularity BSR Profile
Range & Unit Integer (s)
[0600]
Class Class 3
Value 120
4.1.2.2 CPICH POWER UPDATE BASED ON UE RECEIVERRANGE
To make sure that the total power received by UE remains within its dynamic receiver
range, an UE internal measurement is configured after RAB establishment: Event 6E
is then reported by UE when measuring an RSSI that reaches its dynamic receiver
range (as specified by [3GPP_R02]).
uEtoBSRReportingCriteriaRSSITimetoTrigger, in ms, indicates the periodof time between the timing of event detection and the timing of sending
Measurement Report (Event 6E).
Parameter uEtoBSRReportingCriteriaRSSITimetoTrigger
Object BSRProfile
Granularity BSR Profile
Range & Unit Enumerated (ms)
{timetotrigger0, timetotrigger10, timetotrigger20,
timetotrigger40, timetotrigger60, timetotrigger80,
timetotrigger100, timetotrigger120,
timetotrigger160, timetotrigger200,
timetotrigger240, timetotrigger320,
timetotrigger640, timetotrigger1280,
timetotrigger2560, timetotrigger5000}
Class Class 3
Value timetotrigger20
uEtoBSRReportingCriteriaReportingInterval, in ms, indicates the interval of
periodical reporting when such reporting is triggered by Event 6E. 0 means no
periodical reporting.
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Parameter uEtoBSRReportingCriteriaReportingInterval
Object BSRProfile
Granularity BSR Profile
Range & Unit Enumerated (ms)
{reportinginterval0, reportinginterval250,
reportinginterval500, reportinginterval1000,
reportinginterval2000, reportinginterval3000,
reportinginterval4000, reportinginterval6000,
reportinginterval8000, reportinginterval16000,
reportinginterval20000, reportinginterval24000,
reportinginterval28000, reportinginterval32000,
reportinginterval64000}
Class Class 3
Value reportinginterval8000
When BSR receives such Event 6E, it reduces the CPICH power by
autoConfigPWpAdjustmentStepdB, keeping the new CPICH power above its
minimimum value, autoConfigPWminPilotPowerdBm.
CPICHpower[new] = max (CPICHpower[old] -autoConfigPWpAdjustmentStepdB,
autoConfigPWminPilotPowerdBm)
Parameter autoConfigPWpAdjustmentStepdBObject BSRProfile
Granularity BSR Profile
Range & Unit Float (dBm)
[010]
Class Class 3
Value 1
4.1.2.3 CPICH POWER UPDATE BASED ON UE
MEASUREMENTS
Once a new RAB is established, BSR may configure at UE side Events 1C and 1F:
Event 1C: The CPICH of an intra-frequency monitored (or detected) cell
becomes better than the active BSRs.
Event 1F: the active BSRs CPICH becomes worse than an absolute
threshold.
ueBasedPilotPowerAdjustMode allows to activate this feature and to define how
CPICH power is updated.
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Parameter ueBasedPilotPowerAdjustMode
Object BSRProfile
Granularity BSR ProfileRange & Unit Enumerated (ms)
{disable, neighbourEcIo, targetEcIo}
Class Class 3
Value Cf. recommendation hereafter
When set to disable, BSR does not use UE measurements to update CPICH power;
both Events are thus not configured.
When set to neighbourEcIo, BSR only configures Event 1C and optimizes the CPICHpower by comparing the CPICH Ec/Io of all Intra-frequency reported cells, as follows:
If
Active BSRs CPICH Ec/Io < Neighbouring cells CPICH Ec/Io
then
CPICHpower[new] = CPICHpower[old] +autoConfigPWpAdjustmentStepdB
When set to targetEcIo, BSR only configures Event 1F and optimizes the CPICH
power based on the worst CPICH Ec/Io (of this active BSR) reported by any UE in
DCH during the last autoConfigPWUeBasedPilotPowerAdjustIntervalseconds, as
follows:
If
Active BSRs CPICH Ec/Io < autoConfigPWtargetPilotEcIodB
then
CPICHpower[new] = CPICHpower[old] +autoConfigPWpAdjustmentStepdB
Engineering Recommendation: ueBasedPilotPowerAdjustMode
If BSR is deployed on a dedicated carrier and for own usage (i.e. different than Enterprise network),
ueBasedPilotPowerAdjustModeshall be set to targetEcIo.
Otherwise, ueBasedPilotPowerAdjustModeshall be set to neighbourEcIo.
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pSCHPowerdefines the Primary SCH power, in dB, with respect to P-CPICH
power.
Parameter pSCHPower
Object LCellGranularity BSR Profile
Range & Unit Float (dB)
[-3515] step 0.100
Class Class 3
Value -3.0
sSCHPower defines the Secondary SCH power, in dB, with respect to P-
CPICH power.
Parameter sSCHPower
Object LCell
Granularity BSR Profile
Range & Unit Float (dB)
[-3515] step 0.100
Class Class 3
Value -5.0
bCHPowerdefines the BCH power, in dB, with respect to P-CPICH power.
Parameter bCHPower
Object LCell
Granularity BSR Profile
Range & Unit Float (dB)
[-3515] step 0.100
Class Class 3
Value -3.0
pCHPowerdefines the PCH power, in dB, with respect to P-CPICH power.
Parameter pCHPower
Object CCPower
Granularity LCell
Range & Unit Float (dB)
[-3515] step 0.1
Class Class 3
Value 4.0
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pICHPowerdefines the PICH power, in dB, with respect to P-CPICH power.
Parameter pICHPower
Object CCPower
Granularity LCellRange & Unit Integer (dB)
[-105]
Class Class 3
Value -5
aICHPowerdefines the AICH power, in dB, with respect to P-CPICH power.
Parameter aICHPower
Object CCPower
Granularity LCellRange & Unit Float (dB)
[-225] step 0.1
Class Class 3
Value -5
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5. RADIO RESSOURCE MANAGEMENT
5.1. CALL ADMISSION CONTROL
The Call Admission Control (CAC) algorithm is used to admit or deny new RRC
Connection Request based on several criterions presented in section 5.1.2.
5.1.1 EMERGENCY CALL REDIRECTION
Prior to the CAC processing described in section 5.1.2, a specific treatment is
performed for Emergency calls, i.e. when RRC Connection Request cause is set to
Emergency. In such a case, emergencyCallAlwaysRedirectFlag is checked; when
set to True, BSR directly performs an Emergency call redirection to Macro 3G or 2G,
depending on emergencyCallRedirectNetworkvalue.
Parameter emergencyCallAlwaysRedirectFlag
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}Class Class 3
Value False
Parameter emergencyCallRedirectNetwork
Object LCell
Granularity BSR Profile
Range & Unit Enum
{redirectGsmPreferred or redirectUmtsPreferred}
Class Class 3
Value redirectGsmPreferred
If Emergency call redirection is disabled or no Macro neighbouring cell is available nor
eligible, CAC check is performed, as presented hereafter.
5.1.2 PROCESSING CAC
CAC is based on several checks:
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DL/UL loads are lower than thrCACDL/UL (thrCACEmergencyDL/UL for
Emergency calls);
DL & UL resource consumptions are ok;
For non-Emergency call, the number of Cell DCH users is lower than
numCellDCHUE.
Parameter numCellDCHUE
Object LCell
Granularity BSR Profile
Range & Unit Integer
[132]
Class Class 3
Value 4
Refer to section 5.2 for more details on CAC thresholds.
If the above checks fail, the following process applies depending on the RRC
Connection Request establishment cause
CAC rejection for non-Emergency calls
BSR first tries and preempts an UE which is marked for Measurement Acceleration(i.e. which is in Cell DCH for radio optimization).
If there is no UE marked for Measurement Acceleration, BSR performs Active Call
Redirection which allows handing-over an existing CS Speech call such that resources
are freed up to enable the new call. This only takes place if
activeCallRedirectEnabled is set to True and aCRpreference is set to
nonEmergencyCallor both(the type of the RAB to establish).
Parameter activeCallRedirectEnabled
Object BSRProfileGranularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
Cf. recommendation hereafter
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Parameter aCRpreference
Object BSRProfile
Granularity BSR Profile
Range & Unit Enum
{nonEmergencyCall, emergencyCall or Both}
Class Class 3
Value emergencyCall
Cf. recommendation hereafter
Engineering Recommendation: Active Call Redirection
It is recommended to enable Active Call Redirection feature for emergencyCallonly. This will allow to
pre-empt a normal CS Speech call in order to establish an Emergency CS call.
In case Active Call Redirection is disabled or fails, BSR may perform normal call pre-
emption, depending onenableNormalCallPreemption value. When set to True, BSR
pre-empts an existing Cell DCH UE based on the order below:
Cell DCH UE with only PS RAB Background
Cell DCH UE with only PS RAB Interactive
Parameter enableNormalCallPreemption
Object BSRProfileGranularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
CAC rejection for Emergency calls
If CAC fails, BSR first tries and pre-empts an UE marked for Measurement
Acceleration; BSR eventually pre-empts, if needed, an existing Cell DCH UE when
emergencyCallPreemptionEnabledis set to True.
Parameter emergencyCallPreemptionEnabled
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
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If emergencyCallPreemptionEnabled is set to False, BSR finally attempts Active
Call Redirection if activeCallRedirectEnabled is set to True and aCRpreference is
set to emergencyCallor both.
5.1.3 REJECTING RRC CONNECTION
In case the previous checks did not allow to accept the new RRC Connection, BSR
sends back RRC Connection Release to UE with cause Congestion and specifies in
the same RRC message which network to be redirected to, using:
emergencyCallRedirectNetworkfor Emergency calls,
redirectNetworkfor non-Emergency calls.
Parameter redirectNetwork
Object LCell
Granularity BSR Profile
Range & Unit Enum
{disable, redirectGSM or redirectUMTS}
Class Class 3
Value redirectGSM
5.2. DYNAMIC BEARER CONTROL
The Dynamic Bearer Control (DBC) is in charge of the rate allocation for PS and CS
Conversational services on DCH and/or HS-DSCH transport channels based on:
UL and DL load information,
the baseband processor resource usage.
Refer to [R03] for further details on DBC.
5.2.1 DBC BASED ON UL & DL LOAD MEASUREMENT
DBC algorithm first evaluates the environment status for UL & DL based on the latest
CPICH Ec/N0 measurement reported by UE in RRC Connection Request, RRC Cell
Update or RRC Measurement Report (while in Cell DCH). The comparison of CPICH
Ec/No with hardcoded thresholds leads to 2 different values for each UL and DL
environment status: Cell Center or Cell Edge.
Then, DBC admits the incoming request if the following condition is satisfied,
depending on the bearer to be granted.
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PS bearer to be granted
PS bearer Condition for the bearer to be granted
ULPS bearer with 8k, 16k or 32k or 64k load_UL
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Parameter thrCACDL
Object LCell
Granularity BSR Profile
Range & Unit Integer (%)
[0100]
Class Class 3
Value 75
Cf. rule below
Parameter thrDBCDL
Object LCell
Granularity BSR Profile
Range & Unit Integer (%)
[0100]Class Class 3
Value 50
Cf. rule below
Rule: thrDBC and thrCAC
thrDBCDL (resp. thrDBCUL) must be lower than thrCACDL(resp. thrCACUL).
CS bearer to be granted
A similar algorithm applies for CS services:
CS bearer Condition for the bearer to be granted
ULnon-emergency CS bearer with 12.2k or 64k load_UL
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Parameter thrCACEmergencyDL
Object LCell
Granularity BSR Profile
Range & Unit Integer (%)
[0100]
Class Class 3
Value 90
Cf. rule below
Rule: thrCAC and thrCACEmergency
thrCACDL (resp. thrCACUL) must be lower than thrCACEmergencyDL (resp.
thrCACEmergencyUL)
If DBC admission check fails in DL only and DL is allocated on DCH, then the DL data
rate shall be the next lower one. The UL rate shall be the existing UL rate. If no such
combination exists, the UL rate can be negotiated, too.
If DBC check fails in UL only, then the UL data rate shall be changed to the next lower
one. The DL rate shall be the existing DL rate. If no such combination exists and DL is
allocated on DCH, the DL rate can be negotiated, too. If DL is allocated on HS-DSCH,
the DL rate cannot be negotiated.
If finally no combination could be found, DBC negotiation shall be rejected and
procedure shall be stopped.
5.2.2 DBC BASED ON BASEBAND PROCESSING LIMITATION
The BSR shall reject all RAB Setup which is not Emergency call when the most recent
measured load_DL is greater than or equal to thrConCDL.
Parameter thrConCDL
Object LCell
Granularity BSR Profile
Range & Unit Integer (%)
[0100]
Class Class 3
Value 90
Otherwise, the BSR shall check whether:
the DL resource consumption is ok,
the UL resource consumption is ok,
the UL SF usage (including the new RAB) is ok,
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multiple RAB service combination is supported.
In case one of these checks fails, the BSR renegotiates the RAB setup as presented
in section 5.2.1. If renegotiation attempt fails, BSR pre-empts resources from otherestablished PS RAB by reconfiguring it (several PS RABs if needed).
If the new RAB is a CS emergency voice call and the PS RAB(s) pre-emption did not
release enough resources, the BSR will pre-empt an existing CS RAB (CS Data first,
then CS Voice) if emergencyCallPreemptionEnabledis set to True.
5.3. AIR INTERFACE CONGESTION CONTROL
For the purpose of UL and DL load calculation, BSR periodically evaluates the
Received Total Wideband Power (RSSI) and Transmitted Carrier Power (TSSI).
When load_DL becomes greater than or equal to thrConCDL(parameter is presented
in section 5.2.2), Congestion Control is triggered for DL and BSR starts pre-empting
existing RAB(s) until load_DL < thrConCDLin the following order:
PS DCH of the highest data rate with lowest traffic handling priority.
If no PS DCH left, CS Data.
If no PS DCH and CS Data left, CS Voice (non-emergency call).
If no PS DCH, no CS Data and no CS Voice (non-emergency call) left, CS
Voice (emergency call).
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Parameter sIB3CellResExtension
Object LCell
Granularity BSR Profile
Range & Unit Enum
{reserved, notreserved}
Class Class 3
Value notreserved
Under certain circumstances, operators may want to prevent a selected group of UE
from making any access attempts or responding to pages in specified areas of a
PLMN.
System Information Block type 3 (SIB 3) transmits "Cell Access Restriction" IE which
itself contains another IE called "Access Class Barred list". This list includes the UE
Access Class for which the cell has to be considered as barred.
When sIB3AccClassBarredAc0 is set to True, the UEs that are defined with
Access Class 0 are only allowed to initiate Emergency call on this cell. One
parameter is defined at OMC for each Access Class, i.e. 16 parameters, from
sIB3AccClassBarredAc0to sIB3AccClassBarredAc15.
Parameter sIB3AccClassBarredAc0
Object LCell
Granularity BSR Profile
Range & Unit Boolean{True, False}
Class Class 3
Value False
6.2. NEIGHBOURHOOD DEFINITION
6.2.1 3G MACRO NEIGHBOURHOOD
Auto-configuration first aims at generating an initial 3G Macro neighbouring cell list by
scanning and measuring pre-defined 3G Macro cells or frequencies which are
provided to BSR at switch-on.
FDDExtCellobject first provides pre-defined 3G Macro cells, identified by its
instance (mobileCountryCode.mobileNetworkCode.rncId.cellId) and:
o primaryScramblingCode
o fddFreqBand, dlFrequencyNumberandulFrequencyNumber
o routingAreaCodeand locationAreaCode
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LCellMacroUmtsCellFrequencyList object may provide a list of UMTS
frequencies that can be scanned in case no FDDExtCell is declared or BSR
does not manage to get enough eligible 3G Macro cells (cf. next paragraphs):
o freqBand, uARFCNDLand uARFCNULare the parameters to be set
A neighbouring 3G Macro cell is considered as eligible to be broadcast into SIB11 if its
measured CPICH RSCP or CPICH EcNo level is above a certain threshold.
macroCellMeasurementQuantity defines the measurement quantity (either
CPICH RSCP or CPICH EcNo) that is used for the eligibility of a measured 3G
Macro cell.
Parameter macroCellMeasurementQuantity
Object LCell
Granularity BSR Profile
Range & Unit Enum
{ecNO, rSCP}
Class Class 3
Value ecNO
macroCellRSCPThreshold defines the threshold applied to CPICH RSCP
above which a measured 3G Macro cell is considered as eligible when
macroCellMeasurementQuantityis set to rSCP.
Parameter macroCellRSCPThreshold
Object LCell
Granularity BSR Profile
Range & Unit Float (dBm)
[-120-25]
Class Class 3
Value -115
Cf. recommendation below
macroCellEcNoThreshold defines the threshold applied to CPICH EcNo
above which a measured 3G Macro cell is considered as eligible when
macroCellMeasurementQuantityis set to ecNO.
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Parameter macroCellEcNoThreshold
Object LCell
Granularity BSR Profile
Range & Unit Float (dB)
[-250]
Class Class 3
Value -16
Cf. recommendation below
Engineering Recommendation: macroCellRSCPThreshold and macroCellEcNoThreshold
Since 3G Macro neighbourhood is only used for Cell Reselection purpose (Blind HO only applies to
CS speech calls), macroCellRSCPThreshold and macroCellEcNoThreshold shall be setaccordingly to eligibility thresholds for Cell Reselection (cf. section 6.3.2.1):
umtsMacroCellRsInfoQRxLevMin and umtsMacroCellRsInfoQQualMin.
3G measurements are either performed:
by BSR itself in case 3G Network Listening feature is enabled; in that case,
BSR switches to a UE mode with receive-only capability and is able to
decode the 3G neighbourhood present in the best 3G Macros SIB11 to
improve its self-learning;
by requesting an UE to perform intra-frequency or inter-frequencymeasurements (using Compressed Mode if needed by UE); such
measurements are only applicable when a CS call is running.
umtsNtwkListenEnableFlagenables the 3G Network listening feature which
means BSR is able to measure 3G Macro cells by itself. When set to False,
UE is requested to perform such measurements.
Parameter umtsNtwkListenEnableFlag
Object BSRProfile
Granularity BSR ProfileRange & Unit Boolean
{True, False}
Class Class 3
Value True
umtsOpenSearchEnableFlag: when umtsNtwkListenEnableFlag is set to
True, this flag allows the reading of the best neighbouring cells SIB11 to
improve the knowledge of BSRs 3G neighbourhood.
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Parameter umtsOpenSearchEnableFlag
Object BSRProfile
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
BSR stops searching for eligible 3G Macro neighbours when more than
ratioMacroCellBelowThreshold percents of maximum 3G Macro cells to be
broadcast in SIB11 (macroCellListSIB11) respect RSCP or EcNo threshold.
macroCellListSIB11 defines the maximum number of 3G Macro
neighbouring cells to be broadcast in BSRs SIB11.
Parameter macroCellListSIB11
Object LCell
Granularity BSR Profile
Range & Unit Integer
[132]
Class Class 3
Value 8*N3G_FREQ
Cf. recommendation below
ratioMacroCellBelowThreshold indicates the ratio of the number of 3G
macro cells out of the number of 3G macro cell detected that are above
macroCellEcNoThresholdor macroCellRSCPThresholddepending on the
chosen quality measurement.
Parameter ratioMacroCellBelowThreshold
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[0.01.0] range 0.1Class Class 3
Value 0.2
Cf. recommendation below
Engineering Recommendation: macroCellListSIB11 and ratioMacroCellBelowThreshold
Since ALU UTRAN can support up 4 carriers per BTS, it is recommended to define up to 8
neighbouring Macro 3G cells per available carrier, i.e. macroCellListSIB11=8*N3G_FREQ. Then,
recommending ratioMacroCellBelowThreshold=0.2makes BSR stops scanning 3G carriers when at
least 2 Macro 3G cells per available carrier are eligible.
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Once such criterion is fulfilled, BSR periodically maintains its 3G Macro
neighbourhood every periodicMacroCellCheckdays.
Parameter periodicMacroCellCheckObject LCell
Granularity BSR Profile
Range & Unit Decimal (days)
[1365]
Class Class 3
Value 3
6.2.2 GSM MACRO NEIGHBOURHOOD
2G Network Listening feature is not available in BCR2.1 timeframe. Therefore, the
generation of GSM Macro cells strongly relies on pre-configuration through the 2
following objects:
GsmExtCellobject first providing pre-defined GSM Macro cells, identified by
the mobileCountryCode.mobileNetworkCode.locationAreaCode.cellId
(i.e. cell global identifier) and:
o nCC andbCC
o gsmFrequBand andbCCHArfcn
o rAC
LCellGsmFrequencyListobject providing a list of BCCH ARFCN in case:
o no GsmExtCell is declared or BSR does not manage to get enough
eligible GSM Macro cells (cf. next paragraphs)
o and allowedGSMOpenSearchis set to True.
allowedGSMOpenSearch: when set to True, this flag allows:
o to scan the BCCH ARFCN list provided by one or several
LCellGsmFrequencyListobjects,
o and to improve GSM neighbourhood knowledge by reading the best
3G neighbouring cells SIB11 when umtsNtwkListenEnableFlag is
set to True(cf. section 6.1).
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Parameter allowedGSMOpenSearch
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
Note that only the GSM target cells that have been defined under GsmExtCellcan be
eligible to CS Blind Handover (cf. section 6.4.3) as locationAreaCode and rAC,
needed for Relocation procedure, can not be dynamically retrieved by BSR.
Contrary to 3G measurements, GSM measurements are only performed by requesting
an UE to perform GSM measurements (using Compressed Mode if needed by UE).
A neighbouring GSM Macro cell is considered as eligible to be broadcast into BSRs
SIB11 if its measured RSSI level is above gsmcellRSSIThresholdthreshold.
Parameter gsmCellRSSIThreshold
Object LCell
Granularity BSR Profile
Range & Unit Float (dBm)
[-110-48]
Class Class 3
Value -101
Cf. recommendation below
Engineering Recommendation: gsmcellRSSIThreshold
gsmcellRSSIThreshold shall be set accordingly to gsmMacroCellRsInfoQRxLevMin (cf. section
6.3.2.2).
BSR stops searching for eligible GSM Macro neighbours when more than
ratioGSMCellAboveThreshold percents of maximum GSM Macro cells to bebroadcast in SIB11 (gsmCellListSIB11) respect gsmcellRSSIThresholdthreshold.
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gsmCellListSIB11 defines the maximum number of GSM Macro
neighbouring cells to be broadcast in BSRs SIB11.
Parameter gsmCellListSIB11
Object LCellGranularity BSR Profile
Range & Unit Integer
[132]
Class Class 3
Value 10
ratioGSMCellAboveThreshold indicates the ratio of the number of GSM
macro cells out of the number of GSM macro cell detected that are above
gsmcellRSSIThreshold.
Parameter ratioGSMCellAboveThreshold
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[0.01.0] range 0.1
Class Class 3
Value 0.2
With this recommended setting (ratioGSMCellAboveThreshold=0.2 and
gsmCellListSIB11=10), BSR stops scanning GSM carriers when at least 10*0.2=2GSM Macro cells are eligible.
Once such criterion is fulfilled, BSR periodically maintains its GSM Macro
neighbourhood every periodicGSMCellCheckdays.
Parameter periodicGSMCellCheck
Object LCell
Granularity BSR Profile
Range & Unit Integer (days)
[1365]
Class Class 3
Value 3
6.3. CELL RESELECTION
In BCR2.1, HCS (Hierarchical Cell Structure) is NOT implemented and classical cell
reselection algorithms are used, as defined per [3GPP_R01] and explained hereafter.
Moreover, SIB4 & SIB12 are NOT supported so that Cell Reselection information isonly broadcast into SIB3 and SIB11.
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The following parameters are broadcast in SIB3 or SIB11, and detailed in the coming
sections:
SIB3 for cell reselection parameters related to the serving cell
o qQualMin
o qRxLevMin
o maximumAllowedULTXPower
o sIntraSearch
o sInterSearch
o sSearchRAT
o sHCSRAT
o sSearchHCS
o sIB3CrQualityMeasure
o sib3qHyst1s
o sib3qHyst2s
o sIB3InterRATScalingFactor
o sIB3InterFreqScalingFactor
o sIB3TReselection
SIB11 for cell reselection parameters related to the neighbouring cells
o umtsMacroCellRsInfoQQualMin
o umtsMacroCellRsInfoQRxLevMin
o umtsMacroCellRsInfoQOffset1s
o umtsMacroCellRsInfoQOffset2s
o umtsMacroCellRsInfoMaxAllowedULTXPwr
o gsmMacroCellRsInfoQRxLevMin
o gsmMacroCellRsInfoQOffset1s
o gsmMacroCellRsInfoMaxAllowedULTXPwr
o interBSRCellRsInfoQQualMin
o interBSRCellRsInfoQRxLevMin
o interBSRCellRsInfoQOffset1s
o interBSRCellRsInfoQOffset2s
o interBSRCellRsInfoMaxAllowedULTXPwr
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6.3.1 CELL RESELECTION MEASUREMENT RULES
Squaland possibly Srxlevof the BSR serving cell is compared to different threshold
broadcast in the System Information to determine which kind of measurement (intra-
frequency, inter-frequency and inter-RAT) the UE shall do.
Squalis defined by Squal= Qqualmeas qQualMin
Srxlevis defined by Srxlev= Qqualmeas qRxLevMin + Pcompensation
where:
Pcompensation= max (maximumAllowedUlTxPower- P_MAX, 0)
P_MAX = maximum UE output power (dBm) according to its power class.
Power (dBm)Operating Band
Class 1 Class 2 Class 3 Class 4
I UMTS 2100 MHz +33 +27 +24 +21
II UMTS 1900 MHz N.A. N.A. +24 +21
V UMTS 850 MHz (not supported by BSR) N.A. N.A. +24 +21
VI UMTS 850 MHz (not supported by BSR) N.A. N.A. +24 +21
VIII UMTS 900 MHz (not supported by BSR) N.A. N.A. +24 +21
Table 1: UE power Class vs. maximum output power
Parameter qQualMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-24...0]
Class Class 3
Value -15
Parameter qRxLevMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-115..-25] step 2
Class Class 3
Value -111
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Parameter maximumAllowedULTXPwr
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-5033]
Class Class 3
Value 24
In order to limit the time during which the mobile performs measurements on UMTS
and GSM neighbouring cells, criteria for neighbour cells tracking and measurements
are applied.
6.3.1.1 INTRA-FREQUENCY MEASUREMENTS
Squalis compared with the parameter sIntraSearch:
If Squal > sIntraSearch, the UE does not perform intra-frequency
measurements.
If Squal!sIntraSearch, the UE performs intra-frequency measurements.
If sIntraSearch is not sent for the serving cell, the UE performs intra-
frequency measurements.
BSR also makes use of the optional parameter sSearchHCSwhich is a threshold to
be compared with Srxlev in order to define Intra- and Inter-frequency measurements.
Refer to Figure 2 to get a view on measurement decision based on Squaland Srxlev.
6.3.1.2 INTER-FREQUENCY MEASUREMENTS
Squalis compared with the parameter sInterSearch:
If Squal > sInterSearch, the UE does not perform inter-frequency
measurements.
If Squal!sInterSearch, the UE performs inter-frequency measurements.
If sInterSearch is not sent for the serving cell, the UE performs inter-
frequency measurements.
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6.3.1.3 INTER-RAT MEASUREMENTS
Squalis compared with the parameter sSearchRAT:
If Squal > sSearchRAT, the UE does not perform measurements on GSM
cells.
If Squal!sSearchRAT, the UE performs measurements on GSM cells.
If sSearchRAT is not sent for the serving cell, the UE performs
measurements on GSM cells.
BSR also makes use of the optional parameter sHCSRAT which is a threshold to be
compared with Srxlev in order to define GSM measurements.
If sHCSRAT is not sent, GSM measurement is only defined by comparing
Squal and sSearchRAT(cf. above conditions)
If sHCSRAT is sent, refer to Figure 2 to get a view on GSM measurement
decision based on Squaland Srxlev.
6.3.1.4 MEASUREMENT TRIGGERS PARAMETERS
The following tables present the parameters used by the UE to decide whether or not
to perform intra-frequency, inter-frequency or inter-rat measurements.
Parameter sIntraSearch
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-32..20] step 2
Class Class 3
Value Cf. recommendation hereafter
Note: If a negative value is datafilled and sent in SIB3, the UE shall consider the value
to be 0 (see [3GPP_R02]).
Note: The value broadcast in SIB3/4 is half the real value sIntraSearch
Engineering Recommendation: sIntraSearch
sIntraSearchsetting depends on the deployment scenario for FEMTO:
In case FEMTO is deployed by a private and standalone user, sIntraSearchshall be set to 2
so as to delay Intra-frequency measurements as much as possible.
Otherwise, sIntraSearchshall be set to 9.
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Parameter sHCSRAT
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-1..91] step 2
Class Class 3
Value 0
Note: If a negative value is datafilled and sent in SIB3, the UE shall consider the value
to be 0 (see [3GPP_R02]).
Note: The value broadcast in SIB3 is half the real value sHCSRAT
The following picture depicts the decision for selecting Intra-frequency, Inter-frequency
or GSM measurements based on the different thresholds presented before and Squal
and Srxlev levels of the FDD cell selected by UE.
Intra-frequency No measurement
Intra-frequencyInter-frequency
Inter-frequency
Intra-frequencyInter-frequency
GSM
Inter-frequency
GSM
Srxlev
sInterSearch sIntraSearchsSearchRAT
sSearchHCS
sHCSRAT
Squal
Figure 2: Decision thresholds for Measurement
6.3.2 CELL ELIGIBILITY CRITERIA
Once the criteria for measurement decision is hit, UE shall measure the neighbouring
cells that are broadcast in SIB11; there are 3 different categories of neighbouring cell:
3G Macro neighbouring cells
BSR neighbouring cells
GSM neighbouring cells
In the coming sections, UMTS neighbouring cell stands for either 3G Macro or BSR
neighbouring cell.
umtsMacroCellRsInfoEnableBroadcast: when set to True, this flagallows to
broadcast the 3G Macro neighbouring cells in SIB11. When set to False, the
broadcast is inhibited.
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Parameter umtsMacroCellRsInfoEnableBroadcast
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
gsmMacroCellRsInfoEnableBroadcast: when set to True, this flagallows to
broadcast the GSM neighbouring cells in SIB11. When set to False, the
broadcast is inhibited.
Parameter gsmMacroCellRsInfoEnableBroadcast
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value True
interBSRCellRsInfoEnableBroadcast: when set to True, this flag allows to
broadcast the BSR neighbouring cells in SIB11. When set to False, the
broadcast is inhibited.
Parameter interBSRCellRsInfoEnableBroadcast
Object LCell
Granularity BSR Profile
Range & Unit Boolean
{True, False}
Class Class 3
Value Cf. recommendation hereafter
Engineering Recommendation: interBSRCellRsInfoEnableBroadcast
In case FEMTO is deployed as part of an Enterprise network (substituting Pico network),
interBSRCellRsInfoEnableBroadcastshall be set to Trueso as inter-BSR mobility is allowed.
In case FEMTO is deployed by a private and standalone user, interBSRCellRsInfoEnableBroadcast
shall be set to False.
Following measurement decision and SIB11 decoding, UE applies criterion S on the
measured GSM or UMTS neighbouring cells to assess their eligibility to cell
reselection, as presented in the following sections.
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6.3.2.1 3G NEIGHBOURING CELL CRITERIA
To be eligible, the 3G Macro (intra and/or inter-frequency) and BSR neighbouring cells
must fulfill the following criterion:
Squal> 0 ANDSrxlev> 0
i.e.
Qqualmeas> qQualMinAND Qrxlevmeas> qRxLevMin+ Pcompensation
i.e.
CPICH_Ec/No > qQualMinAND CPICH_RSCP > qRxLevMin+ Pcompensation
Where Pcompensation= max (maxAllowedUlTxPower- P_MAX, 0)
Note: These relationships shall be verified on the 3G Macro neighbouring cell and
possibly on BSC neighbouring cell.
Parameter umtsMacroCellRsInfoQQualMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-24...0]
Class Class 3
Value -16
Parameter umtsMacroCellRsInfoQRxLevMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-115...-25] step 2
Class Class 3
Value -115Note: As per 3GPP, IE present in SIB is encoded as follows: qRxLevMin= (IE * 2) +1
Parameter umtsMacroCellRsInfoMaxAllowedULTXPwr
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-5033]
Class Class 3
Value 24
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Parameter interBSRCellRsInfoQQualMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-24...0]
Class Class 3
Value -15
Parameter interBSRCellRsInfoQRxLevMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-115...-25] step 2
Class Class 3
Value -111
Note: As per 3GPP, IE present in SIB is encoded as follows: qRxLevMin= (IE * 2) +1
Parameter interBSRCellRsInfoMaxAllowedULTXPwr
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-5033]
Class Class 3
Value 24
6.3.2.2 GSM NEIGHBOURING CELL CRITERIA
To be eligible, the inter-system GSM cells must fulfill the following criteria:
SrxLev> 0
i.e.
QRxLevMeas> qRxLevMin+ Max (MaxAllowedUlTxPower Pmax, 0)
Neighbouring cell which does not fulfill these criteria can not be eligible to reselection.
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Parameter gsmMacroCellRsInfoQRxLevMin
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)
[-115...-25] step 2
Class Class 3
Value -101
Cf. recommendation hereafter
Note: As per 3GPP, IE present in SIB is encoded as follows: qRxLevMin= (IE * 2) +1
Engineering Recommendation: qRxLevMin
It is recommended to align the value of gsmMacroCellRsInfoMaxAllowedULTXPwr with the used
2G rxLevAccessMinparameter present in the GSM network.The difference between GSM 900/GSM 850 and GSM 1800/1900 is due to MS sensitivity:
GSM 900: -104 dBm,
GSM 1800: -102 dBm.
Parameter gsmMacroCellRsInfoMaxAllowedULTXPwr
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dBm)[-5033]
Class Class 3
Value Refer to following recommendation
Engineering Recommendation: gsmMacroCellRsInfoMaxAllowedULTXPwr
The value of gsmMacroCellRsInfoMaxAllowedULTXPwr shall be set according to the GSM band
which is used on the 2G network, taking also into account the classes of the mobiles ( cf.
[3GPP_R03]).
The following values can be used as a starting point when no information is available from 2G:
33 for GSM 900 MHz Cells
30 for GSM 1800 MHz Cells
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Nominal Maximum output PowerPower Class
GSM400, GSM 850 & GSM 900 DCS 1800 PCS 1900
1 1 W (30 dBm) 1 W (30 dBm)
2 8 W (39 dBm) 0.25 W (24 dBm) 0.25 W (24 dBm)
3 5 W (37 dBm) 4 W (36 dBm) 2 W (33 dBm)
4 2 W (33 dBm)
5 0.8 W (29 dBm)
Table 2: Maximum output power for GSM mobiles
6.3.3 CELL RESELECTION RANKING CRITERION
The cell ranking criterion is used to rank the cells prior to the reselection.
The cell-ranking criterion for serving cell is:
Rs= Qmeas,s + qHyst,s
When sIB3CrQualityMeasure = CPICH_Ec/N0:
Rs=Ec/No + sib3qHyst2s
When sIB3CrQualityMeasure =CPICH_RSCP:
Rs=RSCP +
sib3qHyst1s
Cell ranking criterion for neighbouring cells is:
Rn= Qmeas,n Qoffset s,n
Where:
Qmeas,n = CPICH_Ec/N0or CPICH_RSCP for FDD cells. For GSM cells, the
RxLev (average received signal level) is used instead of CPICH Ec/N0 or
CPICH RSCP in the mapping function.
Qoffset s,n specifies the offset between the serving cell and the neighbouring
cell; it can have two different values:
o qOffset1sn is used with GSM cells or UMTS cells when the quality
measure for cell selection and re-selection is set to CPICH RSCP.
o qOffset2snis only used for UMTS cells when the quality measure for
cell selection and re-selection is set to CPICH EC/N0.
The cells (serving and neighbouring) will be ranked according to the R criterion.
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6.3.3.1 FIRST RANKING
Among the GSM and UMTS Cells verifying S criterion, UE shall perform ranking
according to ranking R criterion, as specified above.
In a first step, the mobile shall always consider the CPICH RSCP / RxLev
measurement and associated set of parameters (qHyst1, qOffset1sn):
Serving Cell: Rs= CPICH_RSCP + sib3qHyst1s
Eligible UMTS Neighbour cell: RnUMTS= CPICH_RSCP qOffset1sn
Eligible GSM Neighbour cell: RnGSM= RxLev qOffset1sn
sib3qHyst1sis the hysteresis value of the serving BSR cell. It is used in the
process of Cell Reselection of cell by the UE when the quality measure for cell
selection and re-selection is the CPICH RSCP.
Parameter sib3qHyst1s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dBm)
[040] range 2
Class Class 3
Value 2
umtsMacroCellRsInfoQOffset1sis the offset between the BSR cell and one
of its 3G Macro neighbouring cells, in case the quality measure for cell
selection/reselection is set to RSCP.
Parameter umtsMacroCellRsInfoQOffset1s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dBm)
[-5050] range 2
Class Class 3
Value 0
interBSRCellRsInfoQOffset1sis the offset between the BSR cell and one of
its BSR neighbouring cells, in case the quality measure for Cell Reselection is
set to RSCP.
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Parameter interBSRCellRsInfoQOffset1s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dBm)
[-5050] range 2
Class Class 3
Value 0
gsmMacroCellRsInfoQOffset1s is the offset between the BSR cell and one
of its GSM neighbouring cells.
Parameter gsmMacroCellRsInfoQOffset1s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dBm)
[-5050] range 2
Class Class 3
Value 0
Then the cell reselection process is as follows (as specified in [3GPP_R01]):
If a GSM cell is ranked as the best cell, then the UE shall perform cell re-
selection to that GSM cell.
If an UMTS cell is ranked as the best cell and the quality measure parameter
sIB3CrQualityMeasure for cell re-selection is set to rSCP, then UE shall
perform cell re-selection to that UMTS cell.
If an UMTS cell is ranked as the best cell and the quality measure parameter
sIB3CrQualityMeasure for cell re-selection is set to eCN0, then UE shall
perform a second ranking.
Parameter sIB3CrQualityMeasure
Object LCell
Granularity BSR Profile
Range & Unit Enum
{ecN0, rSCP}
Class Class 3
Value ecN0
6.3.3.2 SECOND RANKING
In case an UMTS cell is ranked as the best cell according to the first ranking, a second
ranking of the UMTS cells is applied at the CPICH EC/NOcase with the associated set
of parameters (qHyst2, qOffset2sn):
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Serving Cell: Rs= CPICH_Ec/No + qHyst2
Eligible UMTS Neighbour cell: RnUMTS= CPICH_Ec/No qOffset2sn
sib3qHyst2sis the hysteresis value of the serving BSR cell. It is used in the
process of Cell Reselection of cell by the UE when the quality measure for cell
selection and re-selection is the CPICH EcNo.
Parameter sib3qHyst2s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dB)
[040] range 2
Class Class 3
Value 2
umtsMacroCellRsInfoQOffset2sis the offset between the BSR cell and one
of its 3G Macro neighbouring cells, in case the quality measure for Cell
Reselection is set to EcNo.
Parameter umtsMacroCellRsInfoQOffset2s
Object LCell
Granularity BSR Profile
Range & Unit Integer (dB)[-5050] range 2
Class Class 3
Value 0
interBSRCellRsInfoQOffset2sis the offset between the BSR cell and one of
its BSR neighbouring cells, in case the quality measure for Cell Reselection is
set to EcNo.
Parameter interBSRCellRsInfoQOffset2s
Object LCellGranularity BSR Profile
Range & Unit Integer (dB)
[-5050] range 2
Class Class 3
Value 0
6.3.3.3 TARGET CELL SELECTION
Following these rankings, the UE shall perform cell re-selection to the best-rankedUMTS or GSM cell.
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In any case, the UE shall reselect the new cell when both following conditions are met:
The new cell is better ranked than the serving cell during sib3TReselection
time interval.
More than 1 second has elapsed since the UE camped on the current serving
cell.
Parameter sib3TReselection
Object LCell
Granularity BSR Profile
Range & Unit Integer (s)
[031]
Class Class 3
Value 1
Several scaling factors, introduced by 3GPP R5 (and thus only considered by R5
UEs), can be applied to sib3TReselection:
sib3InterFreqScalingFactor between 1 and 4.75, in order to delay the
reselection to Inter-frequency neighbouring cell.
sib3InterRATScalingFactor between 1 and 4.75, in order to delay the
reselection to GSM neighbouring cell.
Parameter sib3InterFreqScalingFactor
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[14.75] step 0.25
Class Class 3
Value 1.5
Note: IE present in SIB is encoded as follows: sib3InterFreqScalingFactor = IE *
0.25
Parameter sib3InterRATScalingFactor
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[14.75] step 0.25
Class Class 3
Value 2
Note: IE present in SIB is encoded as follows: sib3InterRATScalingFactor = IE *0.25
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6.4. HARD HANDOVER
In BCR2.1 release, BSR only supports Blind HO to Macro cell (either 3G or 2G) for CSspeech calls due to radio degradation. This means that:
No action is performed when standalone PS call is running.
In case of multi-service (CS+PS), PS call is first released then handover is
triggered.
6.4.1 ELIGIBILITY FOR HANDOVER
When a CS (resp. CS+PS) call is running, BSR checks the eligibility for blind
handover using the following activation flag targetHOCS (resp. targetHOCSPS)
whose behaviour is as follows:
When set to disable, handover is disabled and CS call eventually drops if
radio condition keeps on degrading.
When set to fdd, only handover to Macro 3G may occur.
When set to gsm, only handover to Macro 2G may occur.
When set to fddPreferred, handover to Macro 3G is the preference but HO to
Macro 2G may occur as a backup if needed.
When set to gsmPreferred, handover to Macro 2G is the preference but HO toMacro 3G may occur as a backup if needed.
Parameter targetHOCS
Object LCell
Granularity BSR Profile
Range & Unit Enumerated
{disable, fdd, gsm, fddPreferred, gsmPreferred}
Class Class 3
Value fddPreferredCf. recommendation hereafter
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Parameter targetHOCSPS
Object LCell
Granularity BSR Profile
Range & Unit Enumerated
{disable, fdd, gsm, fddPreferred, gsmPreferred}
Class Class 3
Value fddPreferred
Cf. recommendation hereafter
Note: targetHOPSis present in OAM Model even though not used.
Parameter targetHOPS
Object LCell
Granularity BSR Profile
Range & Unit Enumerated
{disable, fdd, gsm, fddPreferred, gsmPreferred}
Class Class 3
Value disable
Cf. recommendation hereafter
Engineering Recommendation: targetHO
For CS and CS+PS, it is recommended to perform blind HO to Macro 3G as much as possible;
however, blind HO to GSM should be considered as a backup in case no 3G neighbouring cells is
available. Therefore, targetHOCSand targetHOCSPSmust be set to fddPreferred.
Since Blind HO while in standalone PS is not supported, targetHOPSmust be set to disable.
6.4.2 DETECTING RADIO DEGRADATION
Each time BSR detects the need for radio degradation assessment (i.e. when
targetHOCSor targetHOCSPSare NOT set to disable), 2 Events are configured at
UE side, as per [3GPP_R02]:
Radio is degrading: Event 2D is reported by UE when BSR CPICH Ec/No orCPICH Rscp becomes below a certain threshold;
Radio is back to normal: Event 2F is reported by UE when BSR CPICH Ec/No
or CPICH Rscp becomes above a certain threshold.
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The following setting is used for Event 2D EcNo:
Parameter blindHO2d2fEcnoThreshold2d
Object LCell
Granularity BSR ProfileRange & Unit Decimal (dB)
[-240]
Class Class 3
Value Cf. recommendation hereafter
Parameter blindHO2d2fEcnoTimeToTrigger2d
Object LCell
Granularity BSR Profile
Range & Unit Enumerated (s)
{timetotrigger0, timetotrigger10, timetotrigger20,
timetotrigger40, timetotrigger60, timetotrigger80,
timetotrigger100, timetotrigger120,
timetotrigger160, timetotrigger200,
timetotrigger240, timetotrigger320,
timetotrigger640, timetotrigger1280,
timetotrigger2560, timetotrigger5000}
Class Class 3
Value Cf. recommendation hereafter
Parameter blindHO2d2fEcnoHysteresis2d
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[0...14.5] step 0.5
Class Class 3
Value Cf. recommendation hereafter
The following setting is used for Event 2D Rscp:
Parameter blindHO2d2fRscpThreshold2d
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-115-25]
Class Class 3
Value Cf. recommendation hereafter
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Parameter blindHO2d2fRscpTimeToTrigger2d
Object LCell
Granularity BSR Profile
Range & Unit Enumerated (s)
{timetotrigger0, timetotrigger10, timetotrigger20,
timetotrigger40, timetotrigger60, timetotrigger80,
timetotrigger100, timetotrigger120,
timetotrigger160, timetotrigger200,
timetotrigger240, timetotrigger320,
timetotrigger640, timetotrigger1280,
timetotrigger2560, timetotrigger5000}
Class Class 3
Value Cf. recommendation hereafter
Parameter blindHO2d2fRscpHysteresis2d
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[0...14.5] step 0.5
Class Class 3
Value Cf. recommendation hereafter
The following setting is used for Event 2F EcNo:
Parameter blindHO2d2fEcnoThreshold2f
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-240]
Class Class 3
Value Cf. recommendation hereafter
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Parameter blindHO2d2fEcnoTimeToTrigger2f
Object LCell
Granularity BSR Profile
Range & Unit Enumerated (s)
{timetotrigger0, timetotrigger10, timetotrigger20,
timetotrigger40, timetotrigger60, timetotrigger80,
timetotrigger100, timetotrigger120,
timetotrigger160, timetotrigger200,
timetotrigger240, timetotrigger320,
timetotrigger640, timetotrigger1280,
timetotrigger2560, timetotrigger5000}
Class Class 3
Value Cf. recommendation hereafter
Parameter blindHO2d2fEcnoHysteresis2f
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[0...14.5] step 0.5
Class Class 3
Value Cf. recommendation hereafter
The following setting is used for Event 2F Rscp:
Parameter blindHO2d2fRscpThreshold2f
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[-115-25]
Class Class 3
Value Cf. recommendation hereafter
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Parameter blindHO2d2fRscpTimeToTrigger2f
Object LCell
Granularity BSR Profile
Range & Unit Enumerated (s)
{timetotrigger0, timetotrigger10, timetotrigger20,
timetotrigger40, timetotrigger60, timetotrigger80,
timetotrigger100, timetotrigger120,
timetotrigger160, timetotrigger200,
timetotrigger240, timetotrigger320,
timetotrigger640, timetotrigger1280,
timetotrigger2560, timetotrigger5000}
Class Class 3
Value Cf. recommendation hereafter
Parameter blindHO2d2fRscpHysteresis2f
Object LCell
Granularity BSR Profile
Range & Unit Decimal (dB)
[0...14.5] step 0.5
Class Class 3
Value Cf. recommendation hereafter
The following table resumes the recommendations for 2D setting:
blindHO2d2fEcnoThreshold2d -14 dB -12 dB blindHO2d2fEcnoThreshold2f
blindHO2d2fEcnoTimeToTrigger2d 1280 ms blindHO2d2fEcnoTimeToTrigger2f
blindHO2d2fEcnoHysteresis2d 1 dB blindHO2d2fEcNoHysteresis2f
The following table resumes the recommendations for 2F setting:
blindHO2d2fRscpThreshold2d -105 dB -103 dB blindHO2d2fRscpThreshold2f
blindHO2d2fRscpTimeToTrigger2d 1280 ms blindHO2d2fRscpTimeToTrigger2f
blindHO2d2fRscpHysteresis2d 1 dB blindHO2d2fRscpHysteresis2f
6.4.3 HANDOVER EXECUTION
Once UE has reported an Event 2D, BSC tries to find an eligible target cell starting
from the Macro 3G and/or 2G neighbourhood built during auto-configuration and self-
optimisation steps (cf. section 6.2).
A Macro neighbouring cell is eligible to Blind handover if it fulfills the following
conditions:
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Frequency band is supported by UE
Radio level (if previously determined by BSR) is above a certain threshold
o minBlindHoUmtsMacroEcNo and minBlindHoUmtsMacroRSCP
for Macro 3G;
o minBlindHoGsmMacroRSSI for Macro 2G.
Parameter minBlindHoUmtsMacroEcNo
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[0...49]
Class Class 3
Value 22
(i.e. -13 dB, cf. formula hereafter)
Parameter minBlindHoUmtsMacroRSCP
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[0...91]
Class Class 3
Value 15(i.e. -100 dBm, cf. formula hereafter)
Parameter minBlindHoGsmMacroRSSI
Object LCell
Granularity BSR Profile
Range & Unit Decimal
[0...63]
Class Class 3
Value 10
(i.e. -100 dBm, cf. formula hereafter)
The following formulas apply to get the real threshold:
3G EcNo: real_threshold [dB] = -24 + minBlindHoUmtsMacroEcNo / 2
3G Rscp: real_threshold [dBm] = -115 + minBlindHoUmtsMacroRSCP
2G RSSI: threshold [dBm] = -110 +minBlindHoGsmMacroRSSI
BSC then builds a list of eligible Macro 3G (resp. 2G) neighbours ranked using EcNo
(resp. RSSI) if available, else Rscp.
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Note: among GSM neighbouring cells, only those provisioned under GsmExtCellare
eligible to Blind HO as they contain the mandatory information (locationAreaCode
and rAC) for RANAP Relocation procedures that would not have been dynamically
retrieved by BSR itself.
Finally, depending on targetHOCSor targetHOCSPSvalues (cf. section 6.4.1), BSC
triggers the handover to the best ranked eligible cell. If relocation fails, a new attempt
is made on the next eligible cell until handover succeeds or eligible cell list is empty.
In such a case, handover to the other access can be performed if fddPreferred or
gsmPreferredis selected.
Note: In case of multi-service CS+PS, Iu PS is released before performing thehandover.
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7. INDEXES
7.1. TABLE INDEX
Table 1: UE power Class vs. maximum output power .......................................................................... 36Table 2: Maximum output power for GSM mobiles ............................................................................... 45
7.2. FIGURE INDEX
Figure 1: BSR OAM Model...................................................................................................................... 9Figure 2: Decision thresholds for Measurement.................................................................................... 40
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