Novel Intercell Interference Mitigation Algorithms for Multicell OFDMA Systems with Limited Base Station Cooperation
Jia Dong Shi, Lie‐Liang Yang, Qiang Ni · IEEE Transactions on Vehicular Technology · 2016
Resource allocation in multicell downlink orthogonal frequency division multiple-access (OFDMA) systems is investigated, where base stations (BSs) first independently carry out subcarrier allocation and then mitigate intercell interference (InterCI) with the aid of very limited BS cooperation. Two novel InterCI mitigation algorithms are proposed. The first one is the distributed decision making assisted cooperation (DDMC) algorithm, and the second one is the centralized decision making assisted cooperation (CDMC) algorithm. When employing the DDMC algorithm, each BS independently makes the InterCI mitigation decisions (IMDs). By contrast, when employing the CDMC algorithm, the centralized IMDs are made with the aid of the cell-edge users' discrete InterCI information sharing among BSs. While both algorithms motivate maximization of the spectral efficiency (sum rate), the CDMC algorithm also aims to maximize the frequency reuse factor. In this paper, we study and compare the performance, including spectral efficiency of cell-edge users, frequency reuse factor, and overhead, of the multicell downlink OFDMA systems employing the proposed and other InterCI mitigation algorithms. Our studies show that both the DDMC and CDMC algorithms can achieve better spectral efficiency performance than the existing on-off power (OOP) algorithm. Moreover, the CDMC algorithm is capable of achieving performance close to the upper bound attained by the so-called full InterCI information assisted decision making (FIIDM) algorithm, which uses exhaustive search to determine the IMDs. Additionally, the CDMC algorithm is demonstrated to have the highest frequency reuse factor, in addition to its spectral efficiency advantage.