Patent ID: 9337906
Filing Date: 2016-05-10
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method implemented in a user equipment (UE) used in an orthogonal frequency division multiple access (OFDMA) wireless communications system supporting coordinated multi-point (CoMP) joint transmission (JT), the method comprising: measuring reference signal received power (RSRP); transmitting, to a network, first feedback on the RSRP; receiving, from the network, a CoMP measurement set; conducting pre-scheduling CoMP UE fallback according to the CoMP measurement set; computing channel quality and direction information according to a UE category; and transmitting, to the network, second feedback on the channel quality and direction information, wherein the pre-scheduling CoMP UE fallback comprises: measuring a CoMP aggregated signal-to-interference-plus-noise ratio (SINR) or channel quality index (CQI); and falling back from a CoMP UE to a non-CoMP UE if a total rate based on the measured CoMP aggregated SINR or CQI has no gain over a total rate based on a single-cell per point SINR or CQI, and wherein the second feedback includes a rank-1 precoding matrix index (PMI) for each transmission point (TP) in the CoMP measurement set, an aggregate channel quality index (CQI) computed assuming single user (SU) JT hypothesis and including interference only from TPs outside the CoMP measurement set, a fallback CQI assuming SU transmission from a fallback serving TP and including interference from other TPs other, and inter-point phase information for coherent joint transmission.