Patent ID: 9629141
Date: 2017-04-18
CPC Classifications: H04B,H04L,H04W

Claim:
1. A radio communication system where coordinated multiple-point transmission is applicable, comprising a first radio base station apparatus and a second radio base station apparatus that carry out coordinated multiple-point transmission with respect to a user terminal, wherein: the radio communication system employs a dynamic point selection (DPS) to select the first radio base station apparatus or the second radio base station apparatus as a transmission point of a downlink signal based on received quality information; when the second radio base station apparatus is selected as the transmission point in a subframe for transmitting a retransmission signal of the downlink signal the first radio base station apparatus, the first radio base station apparatus waits for transmission of the retransmission signal until the transmission point is switched from the second radio base station apparatus to the first radio base station apparatus; transmitting by the first base station apparatus the retransmission signal after the transmission point is switched; and the waiting for the transmission of the retransmission signal by the first radio base station is signaled to the user terminal by higher layer signaling.