Methods and apparatus for downlink PDSCH power setting

摘要

Methods and apparatus for transmitting power setting information in a downlink Physical Downlink Shared Channel (PDSCH) in a communication system. In this communication system, a plurality of methods for calculating traffic-to-pilot ratios (T2P) are established. In addition, a mapping scheme between a plurality of overhead signals and a plurality of reference signal (RS) overhead ratios, ηRS, and the plurality of T2P calculation methods is established. A user-specific T2P ratio PB,k/PRS for certain OFDM symbols, a RS overhead ratio ηRS and a calculation method selected from the plurality of T2P calculation methods are assigned to a wireless terminal. Then, an overhead signal corresponding to both of the assigned RS overhead ratio ηRS and the assigned T2P calculation method is selected in accordance with the mapping scheme and is transmitted to the wireless terminal. In addition, the user-specific traffic-to-pilot ratio PB,k/PRS is transmitted to the wireless terminal. The wireless terminal may calculate the traffic-to-pilot ratios across different transmission antennas and different OFDM symbols in dependence upon the received traffic-to-pilot ratio PB,k/PRS, and the RS overhead ratio and the T2P calculation method indicated by the RS overhead signal.

主权项

1. A method of wireless communication, comprising:
receiving first information associated with a first ratio of physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to reference signal (RS) EPRE for first orthogonal frequency division multiplexing OFDM symbols not comprising RS; receiving second information associated with a third ratio of a second ratio to the first ratio, wherein the second ratio is a ratio of PDSCH EPRE to RS EPRE for second OFDM symbols comprising RS; determining the third ratio based on the second information and a number of antennas, wherein the third ratio for one antenna is one of 1, 4/5, 3/5, and 2/5, and wherein the third ratio for two or four antennas is one of 5/4, 1, 3/4, or 1/2; and decoding data based on the first ratio and the third ratio.