基于小区覆盖增强技术的Macro-Pico异构网络上行干扰识别与干扰协调机制

在LTE (Long Term Evolution)异构网络中，由于宏基站(Macro)与微微(Pico)基站的发射功率相差较大，一些离Pico基站较近的用户因为接收到的宏基站下行信号质量好于Pico基站而选择接入宏小区。然而，因为这些用户距离Pico基站较近，因此上行通信会对Pico基站产生严重的上行干扰。小区覆盖增强(Range Expansion, RE)技术能够减少此类干扰，但同时又可能引入新的下行干扰。该文提出一种基于RE技术的上行干扰识别与协调机制(UIICRE)，能够准确识别上行干扰源及其强度，并进行相应的干扰协调处理。仿真结果表明，该文提出的方案能够解决Pico小区的上行干扰问题，提升用户的上行通信质量，并保证用户下行通信质量不受影响。

Uplink Interference Identification and Coordination Scheme Based on Range Expansion in Macro-Pico Heterogeneous Networks

In Long Term Evolution (LTE) heterogeneous networks, the gap between the power of Macro base station and Pico base station makes some users access to Macrocell even if they are closer to Picocell. Under this circumstance, Picocell may suffer severe uplink interference which could not be accurately identified under current schemes. Range Expansion (RE) could mitigate the uplink interference problem. However, it may bring new downlink interference at the same time. This paper proposes an Uplink Interference Identification and Coordination scheme based on Range Expansion (UIICRE) with theoretical analysis. UIICRE could identify the uplink interference sources and their interference strength, and then coordinate the interference according to the identification results. Simulation results show that UIICRE could promote UEs uplink SINR under the condition that its downlink SINR would not be severely affected.