Multi-objective optimization for intercell interference management in advanced multihop cellular networks

In this paper, we present a joint optimization of power control, scheduling and relaying topology for multi-hop cellular networks aware of the intercell interference. To reduce the intercell interference in adjacent cells, cooperative diversity relaying scheme (COOR) is used in the system to reduce the transmission power needed to meet the same SINR threshold as the conventional relaying scheme (CONR). The resulting intercell interference management (I²M) protocols using COOR and CONR schemes will be referred to as I²M-COOR, and I²M-CONR respectively. In this complex scenario, for a given spatial traffic distribution we find the optimum scheduling and relaying topology in order to reduce the overall interference in the network and achieve a proper tradeoff between throughput and power allocation. Numerical results show that I²M-COOR offers an improvement in the network throughput of at least 150% and a reduction of power consumption of at least 130% compared to I²M-CONR. The optimum topology consumes in average 3 times less power than non-optimum options and the variation in throughput between the non-optimum solutions is by factor 5 inferior with respect to the optimum topology.