Interference management and handoff techniques

Michael Mao Wang, Jaber Borran, Tingfang Ji, Tom Richardson, Min Dong

Abstract: In a wireless communications network, cochannel interference from frequency reuse within the network is one of the most significant impairments that affects both link performance and spectral efficiency and has become a major issue in next-generation wireless networks. Using orthogonal frequency division multiple access (OFDMA) [1] in an interference-limited environment is relatively new. Instead, OFDMA was mostly used in noncellular applications that are resource limited [2]. Recently, OFDMA-based systems have been proposed in next-generation wireless wide area network (WWAN) standards, third generation partnership project 2 (3GPP2) ultra mobile broad-band (UMB) [3]-[5], IEEE 802.20 mobile broad-band wireless access (MBWA) [6], [7], 3GPP long-term evolution (LTE) [8], and worldwide interoperability for microwave access (WiMAX) [9]. Interference management is crucial to the performance of an OFDMA-based system, with respect to capacity, coverage, and, most importantly, stability.