CSI reporting on small control channels

摘要

Systems and methods are provided for channel state information (CSI) feedback on small control channels. In some embodiments, a method of operating a second node connected to a first node in a wireless communication network includes reporting CSI feedback to the first node on a physical channel. In some embodiments, this identifies a subset of codebook entries from the advanced CSI codebook of coefficients; select a codebook entry from the subset of codebook entries; This is accomplished by reporting the index of a codebook entry selected from a subset of codebook entries. This can allow for robust feedback and allows variable size co-phasing and beam index indicators to be carried on the channel. In addition, this may allow periodic feedback of advanced CSI in the existing physical uplink control channel (PUCCH) format 2.