Inter-cell Interference Mitigation for Mobile Communication System

With the commercialization of 3G mobile communication systems, the ability to provide diversiform data services, high mobility vehicle communication experiences and asymmetrical services are enhanced further than 2G systems. But at the same time, users still have higher requirement for high-rate and high-QoS mobile services. Many international standardization organizations have launched the research and standardization of 3G evolution system, such as 3GPP Long Term Evolution (LTE) and LTE Advanced project. The primary three standards of 3G are all based on Code Division Multiple Access (CDMA), but with the in-depth research of Orthogonal Frequency Division Multiplexing (OFDM) techniques, OFDM has been emphasized by the mobile communication industry and used as the basic multiple access technique in the Enhanced 3G (E3G) systems for its merit of high spectrum efficiency. OFDM becomes a key technology in the next cellular mobile communication system. As the sub-carriers in the intra-cell are orthogonal with each other, the intra-cell interference can be avoided efficiently. However, the inter-cell interference problems may become serious since many co-frequency sub-carriers are reused among different cells. Under this background, how to mitigate inter-cell interference and improve the performance for cellular users for vehicular environments become more urgent. In this chapter, the research outcomes about Intel-cell Interference Mitigation technologies and corresponding performance evaluation results will be provided. The Intel-cell Interference Mitigation strategies introduced here will include three categories, which are interference coordination, interference prediction and interference cancellation respectively.