Reference signals and common search space for enhanced control channels

摘要

Methods and apparatuses for a User Equipment (UE) to receive signaling of UE-common Downlink Control Information (DCI) in a set of Physical Resource Blocks (PRBs) over a Transmission Time Interval (TTI) are provided. The UE demodulates UE-common DCI using a Reference Signal (RS) that is scrambled by a UE-common scrambling sequence. The UE may assume that RS having a same precoding is transmitted in the set of PRBs over different TTIs. The UE may determine the scrambling sequence implicitly from an identity of a point transmitting the UE-common DCI or explicitly by higher layer signaling. The UE may determine the PRBs of UE-common DCI transmission by broadcast signaling or by higher layer signaling.

主权项

1. A method for transmitting reference signals (RSs) and physical downlink control channels (PDCCHs) to a user equipment (UE) by a base station, the method comprising the steps of:
transmitting first RSs in a first set of physical resource blocks (PRBs) over a first subframe; transmitting second RSs in the first set of PRBs over a second subframe; transmitting third RSs in a second set of PRBs over a third subframe; and transmitting fourth RSs in the second set of PRBs over a fourth subframe, wherein the first subframe and the second subframe are consecutive subframes assigned for PDCCH transmission to the UE, wherein a same preceding is used for the first RSs and for the second RSs, wherein a first PDCCH transmitted in the first set of PRBs conveys a first downlink control information (DCI) format that includes first cyclic redundancy check (CRC) bits scrambled with a first radio network temporary identifier (RNTI) from a first set of RNTIs and a second PDCCH transmitted in the second set of PRBs conveys a second DCI format that includes second CRC bits scrambled with a second RNTI from a second set of RNTIs, wherein the first RNTI in the first set of RNTIs is one of a paging RNTI, a random access RNTI, a system information RNTI, a cell RNTI, and a semi-persistent scheduling (SPS) RNTI, and wherein the second RNTI in the second set of RNTIs is the cell RNTI or the SPS RNTI.