Abstract: A method implemented by a network node in a communication network is provided. The method comprises: assigning a radio network temporary identity (RNTI) comprised in one of a first number of groups corresponding to an aggregation level to a user equipment (UE) associated with the one group; wherein for the first number of UEs, different UEs are associated with different groups corresponding to different control channel elements (CCEs). In the present disclosure, the number of OFDM symbols used for the PDCCH can be reduced, thereby increasing cell throughout since less PDCCH resource implies more PDSCH resources, and decreasing PDCCH blind detection duration and UE power consumption.

Abstract: The present disclosure provides a method in a network device for rank selection. The method includes: adjusting a rank for a transmission to or from a terminal device; and selecting a rank to be used for the transmission based on whether the transmission using the adjusted rank has been successfully received.