Adapting an inter-point combiner phase in a CoMP system if a data packet was received with errors (i.e. NACK message received)

摘要

Inter-point combiner adaption in a radio communication network having coordinated multipoint transmission (CoMP), the method comprising: transmitting a data packet to a User Equipment (UE), receiving an acknowledgment message from the UE, processing an inter-point combiner phase over a respective scheduled band if the data packet was received with errors. Thus, an arrangement is described for adapting outer loop precoder phase combiner in a radio communication system having CoMP transmission. Aspects of the invention include using an ACK/NACK message received as a response to a transmitted data packet for adapting the phase. When a NACK message is received the phase may be adapted or it may be further determined if the error was due to error in channel code or due to destructive inter-point signal combining. If the error was due to destructive combining the phase is adjusted. Further aspects include if the UE received the packet without errors the ACK is received at the TP (Transmission Point) and the TP issues an outer loop link adaption offset step up. If the UE received the packet with errors the NACK message is received at the TP and the TP first issues an outer loop link adaption step down and multiplies (processes) the scheduled band inter-point combiner phase at the TP point by -1.