Mobility

Analysis Into Timing Advance Issue in CoMP Systems

Date Added: Aug 2009
Format: PDF

Coordinated Multi-Point transmission/reception (CoMP) has been adopted in LTE-Advanced to improve system performance, especially User Equipment (UE) at the cell edge. The conventional Timing Advance (TA) design is not suitable since a UE can be served by multiple geographically distributed Access Points (AP). TA issue's impact is investigated in great detail. Simulation results validates that the conventional design limits performance improvement. Two ways can be taken to solve the issue: to adopt extended Cyclic Prefix (CP); to adjust TA based on the nearest AP. Both ways increase the number of UEs that can use CoMP, but the extended CP incurs a large overhead that lowers throughput.