Upload
asojuma
View
32
Download
1
Tags:
Embed Size (px)
DESCRIPTION
uyuyyuy
Citation preview
www.huawei.com
Security Level: Internal Use
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
RAN12 Version Feature
Introduction
Wireless Product Service Department– WRAN Team
ISSUE1.0
2009-05
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 2
Upon completion this course, you will be able to:
Know RAN12 version objectives and roadmap;
Master new features and implementation schemes of
RNC/NodeB in RAN12 version
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 3
《 BSC6900 V9R012C00 Release Notes 》 《 BSC6800 V1R012C00 Release Notes 》 《 NodeB V200R012C00 Release Notes 》 《 RAN12 Feature Sales Guide 》 《 RAN12 PDCP Report Materials 》
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 4
Chapter 1 Version Introduction
Chapter 2 Feature Description
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 5
RAN Version Roadmap
• In RAN12.0, the key features are HSPA+Ph2, IC and FDE which
improve UL/DL broadband capability, enhance in green energy,
maintenance efficiency, user experience, transmission scheme and
emergency communication.
• RAN12.0 mainly include soft features and only new base band ASIC
board is necessary when IC feature is used.
HSDPA Phase4
HSUPA Phase2
MBMS Phase2
CCPIC
RNC resource pool
HSPA+ Phase1
VoIP phaseI
RNC backup
Green Energy
IP transmission
enhancement
CS over HSPA+
HSPA+ Phase2
Advanced Receiver
IC
Green Energy
enhancement
OAM enhancement
EOS enhancement
2009.12-2010.3 2009Q1 2008Q2
RAN 12.0 RAN 11.0 RAN 10.0
HSPA+ Phase3
SON
FA
2010-2011
RAN 13.0
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 6
RAN12 Version Objectives
New Feature
HSPA+Phase2 IC FDE DC 64QAM+MIMO
HSPA+ high-speed Service
Mobility management between UMTS and LTE
Data service QoS management
Improve broadband capability and use experience for customer network
Decrease TCO of customer
Enhance product competition capability
Improve maintenance efficiency and reduce maintenance costs
ProfitNew Solution
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 7
Products Description
Items Description
Products BSC 6800V100R012/
BSC6900V900R012、 DBS3900/BTS3900/BTS3900A/BTS390
0L V200R012、 DBS3800/BTS3812E/BTS3812A V100R012
Protocol
Version3GPP R8 (2009.3), back compatible with R7、 R6、 R5、R4 and R99
Main Feature Inherit the RAN11 function and the new features as follow:
1. UMTS LTE mutual operation
2. HSPA+ Phase2—— IC
3. HSPA+ Phase2—— 64QAM+MIMO
4. HSPA+ Phase2—— UL L2 enhancement
5. HSPA+ Phase2—— UL 16QAM
6. HSPA+ Phase2—— DC-HSDPA
7. FDE
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 8
Chapter 1 Version Introduction
Chapter 2 Feature Description
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 9
Mobility Management Between UMTS and LTE in Phase 1
Description With the mobility management between UMTS and LTE, in phase 1:A UE can hand over to or reselect a UMTS network from a LTE network.A UE in the idle state can reselect a LTE network from a UMTS network.The procedure in which the UE reselects a UMTS network from a LTE network is the same as the procedure in which the UE reselects a UMTS network from a GSM network. Therefore, the RNC supports a UE to reselect a UMTS network from a LTE network by nature.
Improvement The UMTS network broadcasts the system information related to LTE so that a UE in the idle state will reselect a LTE cell in preference.PS services can be handed over from LTE to UMTS.
Implementation Broadcast of system informationThe RNC supports system information block 19. LTE frequency information is broadcast through the system information block 19 to notify UEs of the priority and reselection quality threshold of the adjacent LTE frequency. Based on the information, a UE in the idle state can reselect the LTE network.Handover of PS service from LTE to UMTSAfter receiving a PS handover request from the LTE network, the RNC allocates resources to the requesting UE and instructs the core network to initiate the handover. In this way, the UE can hand over from the LTE network to the UMTS network, without interrupting the PS service.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 10
HSUPA Uplink Interference Cancellation
Description HSUPA UL Interference Cancellation (IC) is performed to cancel the interference caused by the UL high rate EDPDCH data to improve the demodulation signal-to-noise ratio (SNR) and thus to increase the UL system capacity of the network.
Improvement The introduction of the IC technology significantly improves the UL capacity of the UMTS. In certain scenarios, the gain of the IC technology is significant. For example, if the system needs to support a small number of HSUPA users with high throughput and a large number of HSUPA users with low throughput, the IC is required to cancel the uplink interference brought by HSUPA users with high throughput. Without the IC technology, the high UL interference may be generated from the high speed HSUPA users. In such a case, if the rate of the original high rate HSUPA users must be guaranteed, the number of low speed users, for example, VoIP users must be limited. Otherwise, the original high speed HSUPA users may be affected, the speed of services may decrease to the minimum
Implementation
The IC technology supports different categories of HSUPA users, including UEs of categories 1 to 7. The principle of the IC technology is that the receiver of the NodeB demodulates the HSUPA data on the UL EDPDCH and reconstructs the baseband data based on the demodulated data and received baseband data. The NodeB then demodulates the reconstructed baseband data. For the reconstructed baseband data, the interference from the reconstructed EDPDCH data is eliminated and the colored noise in the cell caused by the self-interference feature of the UMTS is reduced. Therefore, the SNR of the reconstructed data is improved.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 11
DC-HSDPA
Description When Dual Carrier-HSDPA (DC-HSDPA) is enabled, the downlink connections can be established simultaneously between the UE and two inter-frequency co-coverage cells that are configured with consecutive frequencies and controlled by the NodeB. The two cells can schedule the UE simultaneously, thus increasing the downlink peak throughput of the UE. When the UE is located at the edge of a cell, the gain of its downlink peak throughput becomes greater.
Improvement The DC-HSDPA helps to increase the throughputs of a single UE and a cell.
Increasing the throughput of a single UE
Owing to the application of DC-HSDPA, the throughputs of the UE at both the
center and edge of the cell are doubled. If the DC-HSDPA is used together
with 64QAM, the throughput of the UE at the center of a cell can reach 42
Mbit/s theoretically.
Increasing the throughput of a cell
Owing to the application of DC-HSDPA, the total throughputs of the two inter-
frequency co-coverage cells are increased by 5% to 10%. The gain of the
throughput is inversely proportional to the number of the UEs in a cell.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 12
DC-HSDPA( Dual Cell - HSDPA)Implementation
The RNC checks whether the UE and cells support DC-HSDPA. When DC-HSDPA is required, the RNC configures two radio links to the NodeB by using the Iub signaling RADIO LINK SETUP REQUEST, RADIO LINK ADDITION REQUEST, and RADIO LINK RECONFIGURATION PREPARE and the RNC configures two radio links to the UE by using Uu signaling RADIO BEARER SETUP, TRANSPORT CHANNEL RECONFIGURATION, ACTIVE SET UPDATE, PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER RECONFIGURATION, CELL UPDATE CONFIRM. Then, the downlink connections between the UE and two inter-frequency co-coverage cells can be established so that DC-HSDPA can be applied.
Cell A
UL DPCH
UL E-DPCCH/E-DPDCH
DL DPCH(F-DPCH)
UL HS-DPCCH
Cell B
Supplementary Carrier DL HS-SCCH/HS-PDSCH
Anchor Carrier DL HS-SCCH/HS-PDSCH
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 13
TCP Accelerator Enhancement
Description In RAN11.0, the Downlink TCP accelerator feature is implemented,
which helps optimize the downlink data transmission.
Based on RAN11.0, the Uplink TCP accelerator feature in RAN12.0
helps accelerate the slow start and recovery of uplink data
transmission through the spilt ACK technique. In this way, the impact
of packet loss on the uplink TCP data transmission is reduced.
Improvement The slow start and recovery of uplink packet transmission at the UE is
accelerated.
The performance of uplink TCP data transmission is improved, and
thus the user experience is also improved.
Implementation The TCP accelerator processes TCP/IP packets with the following
technologies:
Uplink TCP packet sorting.
Downlink split ACK for accelerating slow start and packet transmission at
the UE.
This feature in RAN12.0 is controlled by license as it is in RAN11.0.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 14
Uplink Layer 2 Enhancement
Description With the uplink layer 2 enhancement feature enabled, the data of a flexible Protocol Data
Unit (PDU) size can be transmitted according to the radio transmission environment on the
Uu interface.
When the UE is at the edge of a cell, the data of a small PDU size is transmitted to prevent
the increase of bit error rate (BER) caused by the limited power, so that the data
transmission efficiency is improved.
When the UE is in the center of the cell, the data of a large PDU size is transmitted to meet
the requirement for high data rate and realize the higher data transmission efficiency, so
that the throughput of the system is improved.
Improvement The uplink layer 2 enhancement feature can effectively improve the throughput of a single
user and the throughput of the cell.
Throughput of a single user
When the UE is in the center of the cell, the data of a great PDU size is transmitted on the
radio link layer to meet the requirement for high rate. When the UE is at the edge of the cell,
the data of a small PDU size is transmitted on the radio link layer to reduce the BER caused
by the limited power. In this manner, the throughput of a single user is improved.
Throughput of the cell
The data of different PDU sizes is transmitted in accordance with the data transmission
capability on the Uu interface when the UE is at different locations of a cell. In this way, the
resources on the Uu interface can be utilized optimally and the throughput of the cell can be
improved.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 15
Uplink Layer 2 Enhancement
Implementation
The RNC obtains the information about whether the UE and cell support the
uplink layer 2 enhancement function. If the function can be enabled, the RNC
configures the NodeB through the signaling messages RADIO LINK SETUP
REQUEST, RADIO LINK ADDITION REQUEST, and RADIO LINK
RECONFIGURATION PREPARE on the Iub/Iur interface so that the NodeB
supports uplink layer 2 enhancement. Moreover, the RNC configures the UE
through the signaling messages RADIO BEARER SETUP and RADIO
BEARER RECONFIGURATION on the Uu interface so that the UE supports
uplink layer 2 enhancement. In this manner, the data of an optimal PDU size
is transmitted on the radio link.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 16
UL 16QAM
Description A higher order modulation is introduced based on the Release 7 HSUPA, that is,
the uplink modulation is upgraded from QPSK to 16QAM.
Improvement The throughput of a single user and the throughput of a cell can be improved
through 16QAM.
Throughput of a single user
The uplink throughput of a single user can reach 11 Mbit/s when the channel
quality is good.
Throughput of a cell
The throughput of a cell is increased by 35% to 50%.
Implementation The RNC obtains the information about whether the UE and cell support UL 16QAM. If
the RNC determines that the current service requires UL 16QAM, it sends the
information about the configuration of UL 16QAM to the NodeB through the signaling
RADIO LINK SETUP REQUEST, RADIO LINK ADDITION REQUEST, and RADIO
LINK RECONFIGURATION PREPARE over the Iub interface, and to the UE through
the signaling RADIO BEARER SETUP, TRANSPORT CHANNEL
RECONFIGURATION, ACTIVE SET UPDATE, PHYSICAL CHANNEL
RECONFIGURATION, RADIO BEARER RECONFIGURATION, and CELL UPDATE
CONFIRM over the Uu interface.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 17
64QAM+MIMO
Description Due to the limited UE capability, 64QAM cannot be used with MIMO together, according to the R7
protocol. With the further development of UEs, the HS-DSCH with categories 19 and 20 is
supported,
according to the R8 protocol. In this case, 64QAM can be used with MIMO simultaneously, thus
improving the downlink peak rate for each user.
Improvement The 64QAM+MIMO helps to increase the peak throughputs of a single UE.
The downlink peak rate for each user can reach 21 Mbit/s when only 64QAM is used.
The downlink peak rate for each user can reach 28 Mbit/s when only MIMO is used.
With the application of 64QAM+MIMO, the peak rate for each user is greatly increased, up to
42 Mbit/s theoretically.
Implementation Depending on whether the UE or the cell supports 64QAM+MIMO, the RNC determines whether to
allow 64QAM+MIMO for the ongoing service. If the feature is allowed, the RNC sends the HS-DSCH
category and configuration data for MIMO and 64QAM to the NodeB through the following messages
over the Iub interface: RADIO LINK SETUP REQUEST, RADIO LINK ADDITION REQUEST, and
RADIO LINK RECONFIGURATION PREPARE. Then, the NodeB determines whether to apply
64QAM+MIMO. After the NodeB informs the RNC of the application of 64QAM+MIMO, the RNC
sends configuration data for MIMO and 64QAM to the UE through the following messages over the
Uu interface: RADIO BEARER SETUP, TRANSPORT CHANNEL RECONFIGURATION, ACTIVE
SET UPDATE 、 PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER
RECONFIGURATION, RADIO BEARER RELEASE, and CELL UPDATE CONFIRM. In addition, the
downlink enhanced L2 function is applied together.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 18
Fast Dormancy
Description According to CR 25.331_CR3483R2, after the UE that supports fast dormancy
finishes transmitting data, the UE will send the RNC a message, indicating that the
data transmission is complete. On receiving the message, the RNC releases the
Radio Resource Control (RRC) connection and the UE enters the idle state. In this
way, power and network resources are saved.
Improvement The UE enters low-power mode immediately. Thus, the battery power of the UE is
saved and the network resource utilization is improved.
Implementation 1. The RNC sends SYSTEM INFORMATION (Type 1) that carries T323 to the UE,
informing the UE to enable fast dormancy. After the UE checks that no PS data
is transmitted, it sends to the RNC the SIGNALLING CONNECTION RELEASE
INDICATION message with the cause value "UE Requested PS Data session
end." On receiving the message, the RNC releases the call, and the UE enters
low-power mode.
UE RNC
SYSTEM INFORMATION (Type 1 T323)
SIGNALLING CONNECTION RELEASE INDICATION
(UE Requested PS Data session end)
RRC CONNECTION RELEASE
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 19
Fast Dormancy
Implementation 2. In the process of relocation, the RNC sends to the UE the UTRAN
MOBILITY INFORMATION message that carries T323 if T323 is valid.
UE TRNC SRNC CN
SRNC迁移准备和迁移执行过程
UTRAN MOBILITY INFORMATION CONFIRM
UTRAN MOBILITY INFORMATION (T323)
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 20
Adjustment of CS Voice over HSUPA TTI
Description The CS Voice over HSUPA TTI is dynamically adjusted from 2 ms to 10 ms.
Improvement For the UE handling CS Voice over HSUPA at the cell edge, the TTI is adjusted from
2 ms to 10 ms. Thus, a wider coverage can be provided, QoS can be ensured, and
call drops can be avoided.
Implementation A parameter DRA_VOICE_TTI_RECFG_SWITCH is added to control whether the
TTI for CS Voice over HSUPA can be dynamically adjusted.
1. Measurement delivery
For the CS Voice over 2 ms HSUPA TTI, the RNC sends a message to the UE,
requesting the measurement of the UE transmit power.
2. Measurement release
When the current service is not CS Voice over 2 ms HSUPA TTI, the RNC releases
the measurement of the UE transmit power.
3. Handling of the measurement report
On receiving the event 6A concerning the transmit power from the UE, the RNC
triggers the adjustment of TTI for CS Voice over HSUPA from 2 ms to 10 ms.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 21
Enhanced Multiband Management
Description In a multiband network, the cells that operate on different frequency bands have different coverage
areas. Call drops are likely to occur if a blind handover is performed for the UE between these
cells.
The handover success rate can be increased if handover decisions are made according to the
signal quality measurement result.In a single-band network, the cells that operate at different
layers
have discontinuous coverage areas. Similar to the situations in a multiband network, call drops are
likely to occur in a single-band network if a blind handover is performed for the UE between the
cells at different layers. The handover success rate can also be increased if handover decisions
are
made according to the signal quality measurement result.When a measurement-based handover is
required for traffic steering or load sharing, signal quality measurement should be performed and
then handover decision can be made.
Improvement With this feature, traffic steering or load sharing can be implemented between inter-frequency cells
based on the measurement result, thus increasing the resource utilization while ensuring the
handover success rate. This feature is applicable to the following types of network structure:
1.The cells operating on different frequency bands have different coverage areas, and the
coverage
areas of the cells at different layers may overlap each other.
2. The cells operating on different frequency bands have different coverage areas, and the
coverage areas may be discontinuous.
3. The cells operating on the same frequency band but at different layers may have discontinuous
coverage areas.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 22
Enhanced Multiband Management
Implementation
Traffic steering based on measurement result:
Each cell is configured with the priorities for each type of service (R99 RT, R99 NRT,
HSPA, and others). After the RAB setup (RAB modification or RAB reconfiguration) is
complete or the UE moves, the RNC determines whether a cell with a higher priority
exists according to the UE capability, cell capability, RNC switch, license configuration,
and inter-frequency neighboring cell configuration. If such a cell exists, the RNC
notifies the UE to perform inter-frequency signal quality measurement. Based on the
measurement result reported by the UE, the RNC moves the UE to the highest-priority
cell whose signal quality meets the requirements.
Load sharing based on measurement result:
After the RAB is set up, load reshuffling (LDR) may trigger a load-based inter-
frequency handover. The target cell is selected on the basis of the quality
measurement of cells. Only the cell that meets the quality requirement is selected.
This avoids signal quality deterioration or call drops after the UE is handed over to the
target cell.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 23
Quality Improvement for Subscribed Service
Description This feature enables the adjustment of Service Priority Identification (SPI) of
downlink services by identifying the IP data flow, and thus to adjust the user
scheduling priority. The services that the operator requires most, for example, the
HTTP service or the service of a server specified by the operator, can be
preferentially scheduled to ensure the bandwidth for the services. Moreover, the
scheduling priority of the free-of-charge services that demand large amount of
bandwidth can be lowered so that the bandwidth for the services can be used by
other services of high priorities.
Improvement When the Uu resources are limited, the resources are preferentially allocated to the
services of high priorities, for example, HTTP service or the service of a server
specified by the operator. In this manner, the user experience can be improved and
the operator can provide various services for subscribers.
Implementation The triplet of source IP address, source port number, and protocol type of the
downlink IP packet is parsed to determine whether the IP packet is the IP data flow
that is specified by the operator. If yes, the user scheduling priority is adjusted in
accordance with the triplet configured by the operator.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 24
DPU board replacement not disrupting ongoing services
Description With the introduction of this feature, ongoing services on the dedicated channel are not
disrupted at the RNC side when user plane boards (DPUb/DPUe boards) need to be
replaced. The DPUb/DPUe board needs to be replaced when it is faulty or the DSP on
the board is faulty. In this case, this board can be inhibited through the related MML
command, and then new service establishment request is not handled on this board. In
addition, the established common channels are re-established through other
DPUb/DPUe boards.
Improvement With this feature,
The maintenance personnel can replace a faulty DPUb/DPUe board in time, but
not at midnight when traffic is low.
The ongoing services handled on the faulty board can be free from being
disrupted.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 25
DPU board replacement not disrupting ongoing services
Implementation 1. When the faulty DPUb/DPUe board is inhibited logically, new services are
established through other DPUb/DPUe board. The dedicated channel services
handled by the faulty DPUb/DPUe board, however, are not affected.
2. When the faulty DPUb/DPUe board is inhibited logically, the established common
channels are re-established through other DPUb/DPUe boards. In this process, the
common channel services handled by the faulty DPUb/DPUe board are released. If
the remaining resources on other DPUb/DPUe boards are insufficient to re-establish
all the common channels for the faulty board, only some common channels are re-
established.
3. The maintenance personnel can use the MML command DSP UDSPRESOURCE
to query the real-time data, such as the number of CS users, total number of users,
number of cells, and cell IDs. In this way, the maintenance personnel can replace
the faulty DPUb/DPUe board when the services carried on the board is low, thus
reducing the impact on services.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 26
Single IP address for the NodeB
Description The IP addresses of the NodeB consist of the control plane IP address, user plane IP address, and NodeB OM IP address. Currently, typical application is that the control plane IP address and user plane IP address are configured to use the same port IP address. The OM IP address and user plane IP address should be assigned with two different IP addresses belonging to different IP subnets. Therefore, operators need to plan two sets of IP addresses and routing rules during network deployment. With the introduction of single IP address for the NodeB, the traffic channel and OM channel are enabled to share one IP address.
Improvement With the introduction of single IP address for the NodeB, the traffic channel and OM channel are enabled to share one IP address. In this way, more IP address resources are saved and IP route configuration is simplified when IP transport is adopted.
Implementation
1.When a BTS3900/BTS3900A/DBS3900 is configured with one WMPT and the WMPT provides one or more IP ports, the OM IP address can be the same as one of the port IP addresses. When using redundancy configuration for OM channels, the two OM IP addresses can be the same as those of the two ports provided by the WMPT.2.When a BTS3900/BTS3900A/DBS3900 is configured with one WMPT and multiple UTRPs and the WMPT or UTRP provides one or more IP ports, the OM IP address of the NodeB can be the same as one of the port IP addresses. When using redundancy configuration for OM channels, the two OM IP addresses can be the same as those of the two IP ports provided by the WMPT. The two OM IP addresses are not allowed to be the same as those of two IP ports provided by the UTRP.3.A BTS3900/BTS3900A/DBS3900 is configured with multiple ports (E1/T1/Ethernet), and the ports can be combined as one IP interface through Ethernet Trunk and MLPPP. If the IP port is located on the WMPT, the OM IP address can be the same as that of the combined IP port.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 27
Management and monitoring of the solar equipment
Description The solar power system supplies the power produced by solar array to the load. The surplus power is stored in the batteries. The solar power system runs under the control of the solar controller.
Improvement This feature improves the operability and maintainability of the NodeB and solar equipment, which enables a much greener NodeB.
Implementation 1 、 The solar controller, like the traditional power monitoring device, is managed as the PMU. The configuration, maintenance, and status monitoring of the solar controller are performed through the 485 serial port by the NodeB.2 、 The ADD PMU command is used to add the solar controller to the NodeB configurations. The commands for the PMU are used to configure and maintain the solar controller.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 28
HSUPA Uplink Frequency Domain Balancing
Description With the HSUPA uplink frequency domain balancing feature, the NodeB uplink receiver balances the spectrum in the frequency domain of the HSUPA E-DPDCH and reduces the inter-path interference of the E-DPDCH.
Improvement The uplink inter-path interference of HSUPA users is reduced, thus helping to enhance a higher peak data rate for HSUPA users.
Implementation The NodeB uplink receiver balances the spectrum in the frequency domain of the HSUPA E-DPDCH and reduces the inter-path interference of the E-DPDCH.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 29
Improvement of Small-Traffic Service Delay Experience
Description The services with small traffic (such as HTTP or Gaming) are distinguished from all the services carried by the HSPA channels. More resources are allocated to such services with small traffic, thus enhancing the delay experience.
Improvement Users can obtain better delay experience when using bursty small-traffic services.
Implementation The bursty data packet size is set according to the user priority. For services whose total data amount does not exceed the defined value are identified as small-traffic services. The resources are preferentially allocated to small-traffic services in HSPA scheduling and flow control, thus optimizing the delay.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 30
2x 2 MIMO
Description 2 x 2 Multiple Input Multiple Output (MIMO) uses two transmit antennas at the NodeB to transmit orthogonal (parallel) data streams to the two receive antennas at the UEs.
Improvement Using two antennas and additional signal processing at the receiver and the transmitter, 2 x 2 MIMO can increase the system capacity and double user data rates without using additional bandwidth. 2 x 2 MIMO adopts different modes in the 3GPP protocols, with QPSK and 16QAM in R7, and later with 64QAM in R8. With dual-stream dual-antenna mode and16QAM modulation, the peak data rate per user is doubled to 28 Mbit/s and also the average throughput of the system is enhanced.
Implementation The 3GPP R7 protocols define the categories of the UEs that support MIMO, and add the information elements (IEs) that support MIMO in the reporting of local cell capability. The RNC determines whether the RL between the NodeB and the UE supports MIMO according to the local cell capability and UE capability reported by the NodeB. If the RL supports MIMO, the MAC-hs scheduler of the NodeB determines every 2 ms whether to use MIMO according to the following aspects:Channel Quality Indicator (CQI) reported by the UEPrecoding Control Indication (PCI)HS-PDSCH code resources and power resources of the NodeB
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 31
IP-Based Automatic Address Identification of the NodeB Description In IP mode, Huawei NodeBs have two types of automatic address identification: DHCP
and DHCP+AACP. In practical usage, the RAN system enables different automatic address identification types for different scenarios.The DHCP+AACP type is the enhancement of the NodeB automatic address identification feature.The difference between DHCP and DHCP+AACP is that: In DHCP+AACP mode, one NodeB provides DHCP relay functions for other NodeBs; in DHCP mode, the transmission device in the RAN is required to provide DHCP relay functions for the NodeB.For the IP RAN, not all the networks can provide the network devices with the relay functions. Therefore, the Huawei RAN system introduces DHCP+AACP for such networks.DHCP+AACP is applicable to only the Ethernet transmission.
Improvement
The automatic address identification of the NodeB is implemented when the network devices do not support the DHCP relay functions.
Implementation
When the network devices do not support the DHCP relay function, Huawei RAN system remotely assigns a temporary IP address to a NodeB in the network through the AACP server and sends the AACP detection packet to the subnetwork of the NodeB. Then, one of the NodeBs obtains the AACP detection packet through the ARP mechanism. The temporary IP address is used to communicate with the DHCP server to obtain a formal IP address for the NodeB. When the formal IP address is set, the NodeB can be configured as the DHCP relay of this sub-network, thus helping other NodeBs in the sub-network to perform automatic identification through the DHCP mechanism.
Thank You
www.huawei.com