Abstract：In cellular networks handover-based load balance is a commonly used scheme for balancing the unevenly distributed traffic among different cells in order to improve the spectrum utilization.However,edge users shifted from the heavy-loaded cell to the light-loaded cell usually suffer from SNR degradation.This paper proposed a user relaying assisted load balance scheme to overcome this problem.In the scheme,the shifted user could select another user in the light-loaded cell as the relay node for cooperative transmission.By selecting the appropriate ’user relay’,the SNR degradation could be effectively avoided.Furthermore,we developed an analytical model.in which the necessary condition of the cooperative user selection was analyzed and the optimal user selection criteria for capacity maximization were derived,too.Numerical results showed that the derived cooperative user selection criteria could increase the shifted users’ maximum throughput,which indicated the SNR degradation problem was solved.
2012, Vol. 36 
