Enhanced Dynamic Cell Selection with Muting Scheme for DL CoMP in LTE-A

CoMP JP (Coordinated Multi-Point Joint Processing) is regarded as a promising technique to improve both cell edge user throughput and cell average user throughput in LTE-A downlink. CoMP JP can be categorized as CoMP JT (Joint Transmission) and COMP DCS (Dynamic Cell Selection). Compared with CoMP JT schemes, CoMP DCS provides a good trade-off between the transmission algorithm complexity, backhaul overhead and system performance. Conventional DCS scheme can benefit cell edge users by instantaneous selecting the best severed eNB for cell edge users based on limited signaling overhead in uplink radio interface. DCS with muting scheme further apply muting to the strongest neighbor cell for decreasing interference to cell edge users. However the system spectrum efficiency may be degraded, since frequency reuse one is not maintained and radio resource (resource block and power) may not be fully used. An enhanced DCS with muting method is proposed here to further improve the frequency and power efficiency, by using adaptive muting mode selection based on capacity calculation and flexible power allocation based on muting mode selection status. Performance evaluation shows the proposed algorithm can provide about 5.5% cell average throughput gain and about 10% cell edge throughput gain respectively compared with conventional DCS schemes.