一种新颖的TD-LTE系统上行小区间干扰管理方法英文

C ONCIS E P APER

短文A No ve l Up lin k In t e r-C e ll

In t e r fe r e n c e Ma n a g e m e n t Me t h o d fo r TD-LTE S y s t e m

Zhou Me ng1,Wang Jiang2

1China Mobile Communications Corporation,Beijing100032,P.R.China

2Shanghai Res earch Center for Wireless communications,S hanghai200335,P.R.China

Abstr act:For OFDM based system with Single-Fr equency Networkin g(SFN),ICI(inter-cell interference),especially uplink ICI,becomes a bottleneck to improve system performance.Since the conventional interference management scheme with OI(overload indicator)can not show the instantaneous ICI,this paper proposes a method to reduce ICI by utilizing channel reciprocity of TD-LTE system.In the prop osed scheme, UE shall make a decision whether to reduce its power or not after predicting the instantaneous ICI level according to the scheduling results.The system simulation results show that the proposed scheme can reduce the uplink ICI effectively and improve the system performance such as system spectrum efficiency,10%user throughput,50% user throughput,packet drop rate etc.signi cantly while keep5%cell edge user throughput loss less than5%.For example,the proposed scheme improved system spectrum efficiency about50% and50%user throughput gain is larger than140%. Meanwhile,the proposed scheme controls the system ICI level and variance effectively.The mean system ICI level and variance are reduced by4.5dB and18dB respectively.The proposed sch eme can be joint implem ented with th ose existing ICI mitigation methods such as(soft) frequency reuse,power control etc.to further improve the system performance.

Key wor ds:OFDM;SFN;ICI;channel reciprocity; power control

I.INTRODUCTION

As one key tech nolo gy f or f utur e wir eless communication,SFN based on OFDM(Orthogonal Frequency Division Multiplexing)can achieve higher spectrum efficiency.Different from near-far effect in CDMA systems,there is no intra-cell interference for uplink of those OFDM systems. However,there exist serious ICI if we apply SFN between those neighboring cells.The ICI would degrade system performance significantly, especially for cell edge terminals.How to control ICI to improve system coverage performance is developing to one important and interesting issue. ICI mitigation solutions mainly include decreasing

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