Multiplexing Periodic CSI with HARQ-ACK on PUCCH Format 3 in LTE-A

In order to avoid dropping the periodic CSI report frequently in case of collision between a periodic CSI report and HARQ-ACK feedback in LTE-Advanced system, this paper gives two coding schemes for multiplexing periodic CSI (Channel State Information) with HARQ-ACK (Hybrid Automatic Repeat request Acknowledgement) feedback on PUCCH (Physical Up Control Channel) format 3. The result of simulation shows that both of the two coding schemes can effectively support simultaneous transmission periodic CSI and HARQ-ACK feedback on PUCCH format 3. What’s more, with joint coding scheme, periodic CSI and HARQ-ACK feedback have the same performance, while HARQ-ACK feedback has better performance than periodic CSI with separate coding scheme. Hence through the separate coding scheme, we can not only enhance simultaneous transmission of periodic CSI and HARQ-ACK feedback, but also guarantee the similar performance of HARQ-ACK feedback as transmitting it alone. Index Terms — Periodic CSI, HARQ-ACK, Multiplexing, PUCCH format 3