Systems and methods for transmitting channel quality information in wireless communication systems

摘要

A base station in a wireless network transmits to a mobile station downlink subframes of OFDM symbols. Each downlink subframe comprises a plurality of resource blocks and is associated with a subframe (SF) type that is determined according to whether or not a PDSCH region of a resource block in a downlink subframe includes at least one of: 1) a cell-specific reference signal (CRS) resource element and 2) a channel-state-information reference signal (CSI-RS) resource element. The base station receives from the mobile station at least one of CQI, PMI, modulation scheme, and transport block size and interprets the received at least one of CQI, PMI, modulation scheme, and transport block size according to a default SF type used by the first mobile station to determine the at least one of CQI, PMI, modulation scheme, and transport block size.

主权项

1. A base station for transmitting to a mobile station downlink subframes of OFDM symbols, each downlink subframe comprising:
a plurality of resource blocks, wherein the downlink subframe is associated with a subframe (SF) type determined according to a combination of a presence or an absence of cell-specific reference signal (CRS) resource element and a presence or an absence of channel-state-information reference signal (CSI-RS) resource element, the combination included in a PDSCH region of a resource block in the downlink subframe, and wherein the base station is configured to receive from the mobile station at least one of CQI, PMI, modulation scheme, and transport block size and is configured to interpret the received at least one of CQI, PMI, modulation scheme, and transport block size according to a default SF type, wherein the mobile station is configured to determine the at least one of CQI, PMI, modulation scheme, and transport block size of the downlink SF's based on the default SF.