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1、BBU POOL (COMP) 测试计划中国联通.诺基亚湖南长沙06-11-2014测试项目概述本测试旨在验证LTE-FDD集中式BBU池设备在室外密集城区、室内外同频组网等场景下抑制多小区间同频干扰，提升系统/边缘频谱效率的能力。主要评估所述干扰抑制特性带来的性能增益（包括小区边缘、小区平均传输速率增益）、对网络KPI指标（包括峰值速率、控制面/用户面时延）影响及其性能稳定性。测试涉及诺基亚设备主要功能：LTE1402 UL intra eNB CoMP ；LTE1800 DL interference shaping；LTE1724 Centralized RAN ；LTE1402: Up

2、link intra-eNB CoMP.Introduction (I)3GPP specifies two solutions for uplink Co-ordinated Multi-Point with TR 36.819Joint Reception (JR) Co-ordinated Scheduling and Beamforming (CS/CB)LTE1402 provides a solution for intra eNode B Joint ReceptionInter-eNode B Joint Reception is more challenging due to

3、 the delay requirements in transferring the PUSCH between eNode BUL CoMPcell 1PDCCHPUSCH received , combined, decodedPUSCH receivedPUSCH relayedcell 2Joint Receptioncell 1PDCCHPUSCH received , decodedInformation to help schedulingcell 2Co-ordinated Scheduling and BeamformingIntroduction (II)When usi

4、ng uplink CoMP, the eNode B is able to use the antenna elements belonging to 1 neighbouring cell, in addition to the antenna elements belonging to the serving cellprovides a solution for 4-way Interference Rejection Combining (IRC)The neighbouring cell is selected from one of two possible neighbours

5、the serving cell + 2 neighbouring cells belong to the CoMP Cooperating SetUL CoMPReception PointReception Point3 cells within CoMP Cooperating SetUplink CoMP is only applied to the PUSCHPRACH, PUCCH & SRS are only received by the serving cellEvery subframe, the eNode B:decides whether or not combini

6、ng with another cell will be doneselects the neighbouring cell to combine (if combining is to be done)LTE1800: DL interference shaping.LTE1800基本上限制在PDSCH仅调度到某个区域中的频域。有两种不同的机制（子功能）：interference shaping和PDSCH blanking，既可以单独地被激活，也可以在组合工作；Interference shaping 定义了PDSCH调度发生的优选区域。该区域可以扩大或缩小，以适应负载.PDSCH bla

7、nking 永久地排除某些用于下行调度的 PRBs.技术描述技术描述Shaping 和 blanking Blanking （淡蓝色） - 没有分配都是有可能的Shaping 分配唯一的优选区域（灰色）。优选的区域的大小适应于本身的小区负载（深蓝）Shaping 可以与 blanking一起激活. preferred area的扩展地带可能受限于 blanked zone. 超过的话务（深灰色）将不会被分配在blanked zone - 将不得不等待在缓存中unallocated RBG = whiteallocated RBGPreferred areaBlanked zoneDL inte

8、rference shaping功能作用：将下行调度限制在优选的区域，例如，RBG在频域中的连续的部分 可预测的DL干扰：更多可利用的静态位置资源在分级负荷的小区改善高负载的相邻小区质量，特别是对于小区边缘的UE影响：对于动态下行调度的可用资源的确定 空白区的确定 剔除动态下行调度的空白资源FTP Scenario #1 (Macro Macro)Average throughput of all cellsEdge throughput of all cellsFairness - Average throughput of all cellsFairness - Edge throughp

9、ut of all cellsL = % of load for fractionally loaded cellsH = % of load for full-load cellsL/H70%80%90%L/H70%80%90%L/H70%80%90%L/H70%80%90%10%0.3%1.4%1.4%10%3.0%9.9%7.3%10%0.8%2.3%3.5%10%11.1%24.9%40.4%20%0.4%1.5%3.5%20%2.1%10.6%16.7%20%0.2%3.0%7.4%20%-3.6%32.1%65.6%30%0.8%1.7%3.9%30%7.6%11.8%24.9%3

10、0%2.1%4.0%7.5%30%25.6%33.6%53.7%1.7%10.4%3.4%31.5%Basic scenarios for interference shapingThe simplest scenario where this feature is expected to provide a gain is a fractionally loaded cell with a neighboring highly/fully loaded cell. Utilization of PRB resources in cell 1 es visible in the frequen

11、cy selective channel quality reporting of a cell edge UE in cell 2.Fractional loadHeavy loadBasic scenarios for interference shapingWhen the feature is activated for a cluster of neighboring cells, the position of preferred areas need to be arranged to be disjoint between adjacent cells. Owing to hi

12、s, the mutual interference is mitigated, as long as the load in all cells remains fractional.Basic scenarios for interference shapingIn a heterogeneous network, with neighboring cells of different cell type (i.e., macro, micro/pico), it needs to be defined which cell types should apply interference

13、shaping. The preferred area arrangement will depend from the cell type. This aims at limiting specific types of interference, and is dependent on the respective loads. Example: Heterogeneous scenario with alignment between macro cells onlyLTE1724: Centralized RAN14Cell 1Cell 2Cell 3Cell 4Cell 5Cell

14、6UE 1UE kUE hUE gUE nUE zStandard stadium case WITHOUT LTE1724 CRAN feature每个DSP是独立的，不知道邻区DSP的接收和处理。DSP1DSP2DSP3DSP4DSP5DSP6InterferencesInterferencesServing cellear = antennaIntroduction LTE1724 Centralized RAN15Cell 1Cell 2Cell 3Cell 4Cell 5Cell 6UE 1UE kUE hUE gUE nUE zDSPs 相互合作 (6 RRHs/ 12 RX an

15、t.) 共同处理 4 RRHs/ 8 RX ant. (UL IRC) !Stadium case WITH LTE1724 CRAN feature (UL CoMP functionality)DSP1DSP2DSP3DSP4DSP5DSP6Interferencesbut Interferencesbut Serving cellReception Set: 8 RX antennas are used for IRCear = antenna在IRC算法得到的数据进行工作之前，RRH1和RRH6也可以选择到基于实时在TTI级别优化的接收设置配置(联合接收技术形成一个虚拟天线阵列)Tec

16、hnical Details LTE1724 Centralized RANLTE1724 Centralized RAN feature is based on UL CoMP functionalityUL CoMP set Cells/RRHs that are evaluated for SINR conditions prior to selection for IRC combiningFor LTE 1724, the UL CoMP set consists of up to 6 cells (each cell/RRH uses 2 RX antennas only).Rec

17、eption set subset of UL CoMP set , Cells/RRHs that are selected based on SINR criteria to be processed by the IRC receiver. For LTE1724, the Reception Set consists of 4 cells with the highest SINR.16UERRH1RRH2RRH3RRH4RRH5RRH6XXXXXXUL/DL serving cell red cell i.e. RRH5 (single cell only). To change U

18、L/DL serving cell, Handover is required.- pol antennaUL CoMP set 6 cells i.e. RRH1, RRH2, RRH3, RRH4, RRH5 , RRH6Reception set (UL) 4 cells i.e. RRH5 and RRH y, RRH z, RRH m, wherey, z, m selected from the set: 1, 2, 3, 4, 6 based on highest UL SINR averaged over 2 slants of X-pol antenna e.g. for R

19、RH1UL SINR(RRH1)=(UL_SINR(+45)+ UL_SINR(-45)/2Technical Details LTE1724 Centralized RAN17UL/DL serving cell red cell i.e. RRH5 (single cell only). To change UL/DL serving cell, Handover is required.UL CoMP set 6 cells i.e. RRH1, RRH2, RRH3, RRH4, RRH5 , RRH6Reception set (UL) 4 cells i.e. RRH5 and R

20、RH 2, RRH 4, RRH 6(Purple cells)RRH5XXRRH4XRRH6Reception set (UL) 4 cells i.e. RRH5 and RRH 2, RRH 4, RRH 1XRRH1Reception set (UL) 4 cells i.e. RRH5 and RRH 2, RRH 3, RRH 1- pol antennaRRH3XReception set (UL) 4 cells i.e. RRH5 and RRH 2, RRH 3, RRH 6Reception set (UL) 4 cells i.e. RRH5 and RRH 1, RR

21、H 4, RRH 6UEXRRH2Reception set (UL) 4 cells i.e. RRH5 and RRH 1, RRH 4, RRH 3Reception set (UL) 4 cells i.e. RRH5 and RRH 1, RRH 6, RRH 3Reception set (UL) 4 cells i.e. RRH5 and RRH 4, RRH 6, RRH 3Conclusions: For considered UE, UL CoMP set is static for selected UL/DL serving cell. Reception set ch

22、anges its content dynamically per SINR conditions in every TTI. LTE1724 Centralized RAN feature is based on UL CoMP functionalityUL CoMP set Cells/RRHs that are evaluated for SINR conditions prior to selection for IRC combiningFor LTE 1724, the UL CoMP set consists of up to 6 cells (each cell/RRH us

23、es 2 RX antennas only).Reception set subset of UL CoMP set , Cells/RRHs that are selected based on SINR criteria to be processed by the IRC receiver. For LTE1724, the Reception Set consists of 4 cells with the highest SINR.AnimationConfiguration #3.1: Flat 4+4+4 cell (FHEB) configuration with three FSMFsPort 5Port 56 Gbps linkSector 1Tx2 & Rx2FBBA #1FBBA #2FBBA #2FSM - 1FSM - 2#1(1)#2(2)#3(3)#4(4)#5(1)#6(2)#7(3)#8(4)FHEB (1800MHz)Sector 1Tx1 & Rx1Port 5FBBA #1FBBA #2FSM - 3#