LTE的多點(diǎn)協(xié)傳CoMP介紹

1、CoMP (Coordinated multi-point operation )本知識(shí)點(diǎn)有關(guān)技術(shù)來自TR36.819CoMPT以提供以下功能：提升高速率的覆蓋率提升小區(qū)邊緣的吞吐率增強(qiáng)系統(tǒng)吞吐率通信系統(tǒng)最開始的時(shí)候都是 SISO,后期為了提升吞吐率，演進(jìn)為 MIMO不管什 么創(chuàng)新的計(jì)算，要不就是為了提升吞吐率，要不就是為了增強(qiáng)穩(wěn)定性。Ditt*rert H*eeunptyMIMO8MpUsual y SiHaFrflquQHC*MAXHuan Paw&r Tk KRHOptical FiberLow Power Ik RRH (mni-AntennScpnno 3. 4, Incrv

2、dt'S SpacVdi Efficisnc/ Reduce Inte<rerence Increase -h<?uqkput協(xié)議提議的方案4種不同的方案，如下所示。針對CoMPT以帶來效益的情況，提出了Scenario 1Scenario 2< Scenario 1 >適用于同質(zhì)網(wǎng)絡(luò)（無需光纖回程連接）同一宏基站控制的小區(qū)（扇區(qū)）問的協(xié)調(diào)< Scenario 2>適用于同構(gòu)網(wǎng)絡(luò)宏單元和多個(gè)高發(fā)射功率 RRH(Remote Radio Head)之間的CoMP< Scenario 3>適用于異構(gòu)網(wǎng)絡(luò)宏小區(qū)和多個(gè)低發(fā)射功率 RRH(Remo

3、te Radio Head)之間的CoMP由RRhffl建的傳輸/接收點(diǎn)的小區(qū)ID與宏小區(qū)的ID不同< Scenario 4>適用于異構(gòu)網(wǎng)絡(luò)宏小區(qū)和多個(gè)低發(fā)射功率 RRH(Remote Radio Head)之間的CoMP由RRhffl建的傳輸/接收點(diǎn)的小區(qū)ID與宏小區(qū)的ID相同同構(gòu)網(wǎng)絡(luò)與異構(gòu)網(wǎng)絡(luò)同構(gòu)網(wǎng)絡(luò)：由同一類型和功率等級(jí)的所有基站組成的網(wǎng)絡(luò)。異構(gòu)網(wǎng)絡(luò)：由不同基站類型和不同功率等級(jí)組成的網(wǎng)絡(luò)。由于宏節(jié)點(diǎn)和低功率節(jié)點(diǎn)之間的距離較近，且功率等級(jí)不同，這類網(wǎng)絡(luò)可能會(huì)受到嚴(yán)重的小區(qū)間干擾。<CS/CB (協(xié)調(diào)調(diào)度 / 協(xié)調(diào)波束賦形)Coordinated Scheduling/C

4、oordinatedBeamforming>多個(gè)協(xié)調(diào)的TP (Transmission Points )只為多個(gè)UE共享CSI,并且目的地 為特定UE的數(shù)據(jù)分組僅在一個(gè)TP處可用。在CB中，計(jì)算功率電平和波束形成系數(shù)，以實(shí)現(xiàn)系統(tǒng)中的一些常見sinr或最大化最小SNIR在CS中，網(wǎng)絡(luò)被劃分為多個(gè)集群，并在每個(gè)集群內(nèi)應(yīng)用中心化調(diào)度，以確定 集群中的哪些TPs應(yīng)在每個(gè)時(shí)隙中發(fā)送，以及應(yīng)向哪個(gè) UE發(fā)送。CS/CB是一種聯(lián)合使用CB和CS的技術(shù)。<JT （聯(lián)合傳輸）Joint Transmission多個(gè)協(xié)調(diào)的TPs以適當(dāng)?shù)牟ㄊ纬蓹?quán)重發(fā)送相同的數(shù)據(jù)<TPS （傳輸點(diǎn)選擇）Trans

5、mission Point Selection它可以看作是JT的一種特殊形式。在每個(gè)時(shí)間實(shí)例中，在單個(gè)TP處執(zhí)行給定UE終端的波束形成數(shù)據(jù)的傳輸該技術(shù)利用信道衰落條件的變化，使 UE能夠由最佳TP動(dòng)態(tài)調(diào)度。Changes these dynam cEllyCoM咪顧名思義（CoMP:Coordinated Mult Point）, CoMP!以多個(gè)點(diǎn)為單位運(yùn)行的。參與CoMP勺多個(gè)點(diǎn)稱為“ Set”。有兩大類CoMFS,如下所述。<CoM臊作集>CoMPM乍集是參與CoMPM乍的多個(gè)地理上分離的點(diǎn)。集合中的每個(gè)點(diǎn)可以直接或間接參與CoMPM乍。?直接參與意味著這些點(diǎn)實(shí)際傳輸數(shù)據(jù)?間

6、接參與意味著這些點(diǎn)不傳輸數(shù)據(jù)，而是通過參與用戶調(diào)度/波束形成的決策而影響CoMPM乍一個(gè)集合內(nèi)的CoM的輸點(diǎn)的工作方式可能略有不同，具體取決于CoM方案 （類別）?在JT （聯(lián)合傳輸）中，所有這些點(diǎn)都將在預(yù)定的子幀上傳輸數(shù)據(jù)? 在CS/CB DPS SSP中，只有其中一個(gè)點(diǎn)實(shí)際傳輸數(shù)據(jù)，而其他點(diǎn)協(xié)助 CoMPS作<CoMPM量集 >CoM嚏量集是多個(gè)地理上分離的點(diǎn)，UE執(zhí)行測量（CSI）并報(bào)告結(jié)果。RRC5W的 CoMP下面是與CoMP!關(guān)的RRQ肖息信息元素的總體結(jié)構(gòu)。E physgGonfig口前i 寸WdIWUQgQOQj p d $ cfl-Gorfig p e-a can

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16、N< TS 36.211 - Table 6.10.5.2-1: Mapping from CSI reference signal configuration to (k', l' ) for normal cyclic prefix >CSI reference signal configurationNumber of GSI reference signals configured1 or24&出J)n3 mod 2（第用% mod 2依也 mod?0(25)0陸5)0區(qū)5)01(11.2)1(11,2)1(11212出2)1(921(9,2)13(

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18、ubframe offset 1(打.居 (subfrjme5)0-45Azsi-rs5-1410CSI-K515-3420ZCSI-RS_1535 - 7440仃1庭一克75-154時(shí)C5J-RS - 7)效果：TDD下行Table 7.1.1.2-1: Absolute performance of CS/CB in scenario 1 with full bufferTDD,3GPP,cross-polarized deploymentcross-polarized antennasource 2source 3source 14MU-MIMO 2x2Cell avg2.492.35C

19、ell-edge0.06630.073MU-MIMO 4x2Cell avg3.432.98Cell-edge0.1000.111MU-MIMO 8x2Cell avg4.294.256Cell-edge0.1510.106CS/CB MU-MIMO 2x2Cell avg2.622.39Cell-edge0.07330.078CS/CB MU-MIMO 4x2Cell avg3.663.07Cell-edge0.1160.12CS/CB MU-MIMO 8x2Cell avg4.764.061Cell-edge0.1810.107Table 7.1.1.2-2: Absolute perfo

20、rmance of JP in scenario 1 with full buffer TDD,3GPP,cross-polarized deploymentcross-polarized antennasource 1source 2source 3source 12source 14source 18MU-MIMO 2x2Cell avg1.9112.492.351.45Cell-edge0.04390.06630.0730.045MU-MIMO 4x2Cell avg2.7793.432.983.48Cell-edge0.07630.1000.1110.102MU-MIMO 8x2Cel

21、l avg4.294.214.2565.46Cell-edge0.1510.1340.1060.183JT MU-MIMO 2x2Cell avg2.4192.792.462.01Cell-edge0.06720.07500.0840.075JT MU-MIMO 4x2Cell avg3.5963.932.983.89Cell-edge0.1120.1230.120.142JT MU-MIMO 8x2Cell avg4.805.183.5776.15Cell-edge0.1720.1640.110.227Table 7.1.1.2-3: Relative performance gain of

22、 DL CoMP in scenario 1 with full buffer TDD,3GPP,cross-polarized deploymentcross-polarized antennanumber ofsourcesaverage relative gainsmallest relative gainlargest relativegainCS/CB MU-MIMO 2x2 vs. MU-MIMO 2x22Cell avg3.37%1.70%5.03%Cell-edge8.66%6.85%10.48%CS/CB MU-MIMO 4x2 vs. MU-MIMO 4x22Cell av

23、g4.92%3.02%6.82%Cell-edge12.15%8.11%16.19%CS/CB MU-MIMO 8x2 vs. MU-MIMO 8x22Cell avg3.27%-4.58%11.13%Cell-edge10.51%0.94%20.08%JT MU-MIMO 2x2 vs. MU-MIMO 2x24Cell avg20.45%4.68%38.62%Cell-edge36.94%12.97%66.67%JT MU-MIMO 4x2 vs. MU-MIMO 4x24Cell avg14.00%0.00%29.40%Cell-edge29.37%8.11%46.79%JT MU-MI

24、MO 8x2 vs. MU-MIMO 8x24Cell avg7.94%-15.95%23.04%Cell-edge16.09%3.77%24.04%Table 7.1.1.2-4: Absolute performance of JP in scenario 1 with full bufferTDD,3GPP,ULAULAsource 1source 3source 12MU-MIMO 2x2Cell avg2.0691.86Cell-edge0.05480.058MU-MIMO 4x2Cell avg3.1633.05Cell-edge0.08630.1MU-MIMO 8x2Cell a

25、vg4.5Cell-edge0.151JT MU-MIMO 2x2Cell avg2.7112.382.49Cell-edge0.0780.1|0.095JT MU-MIMO 4x2Cell avg4.0752.85Cell-edge0.1190.129JT MU-MIMO 8x2Cell avg5.66Cell-edge0.188Table 7.1.1.2-5: Relative performance gain of DL CoMP in scenario 1 with full buffer TDD,3GPP,ULAULAnumber ofsourcesaverage relative

26、gainsmallest relative gainlargest relativegainJT MU-MIMO 2x2 vs. MU-MIMO 2x22Cell avg32.45%31.03%33.87%Cell-edge53.06%42.34%63.79%JT MU-MIMO 4x2 vs. MU-MIMO 4x22Cell avg11.14%-6.56%28.83%Cell-edge33.45%29.00%37.89%JT MU-MIMO 8x2 vs. MU-MIMO 8x21Cell avg25.78%25.78%25.78%Cell-edge24.50%24.50%24.50%FD

27、D下行Table 7.1.1.1-1: Absolute performance of CS/CB in scenario 1 with full buffer FDD,3GPP, cross-polarized deploymentcross-polarized antennasource 1source 4source 10source 14source 17source 20SU-MIMO 2x2Cell avg1.6362.0534Cell-edge0.04880.0509SU-MIMO 4x2Cell avg1.9372.51231.962Cell-edge0.062080.06840.0721MU-MIMO 2x2Cell avg1.7971.57621.8092.47Cell-edge0.04370.05790.0420.06MU-MIMO 4x2