Methods and apparatuses for transmitting and receiving channel quality indicator (CQI) in broadband wireless communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsWon-Kyun Suk, Keun-Chul Hwang
Life of this patent
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Abstract
A terminal is operable to transmit and receive CQI in a broadband wireless communication system. An operating method of the terminal for transmitting a CQI in a broadband wireless communication system includes requesting a band Adaptive Modulation and Coding (AMC) subchannel to a base station; after requesting the band AMC subchannel, transmitting a broadband CQI to the base station over a first control channel; and transmitting a first differential CQI relating to a band AMC allocated using the broadband CQI, over a second control channel. Thus, the overhead in the CQI feedback can be minimized and the CQI reception performance can be enhanced through the most robust encoding.
Claims36
An operating method of a terminal in a broadband wireless communication system, the method comprising:
- transmitting a broadband Channel Quality Indicator (CQI) for a plurality of bands to a base station over a first control channel;
- checking whether a band Adaptive Modulation and Coding (AMC) subchannel is allocated;
- and
- transmitting a first per band differential CQI relating to the band AMC subchannel allocated to the base station over a second control channel,
- wherein the broadband CQI comprises an average or median value of CQIs measured per band among the plurality of bands, and the first per band differential CQI has a value based on the comparison result between the broadband CQI and CQIs for the plurality of bands.
An operating method of a base station in a broadband wireless communication system, the method comprising:
- receiving a broadband Channel Quality Indicator (CQI) for a plurality of bands from a terminal over a first control channel;
- allocating a band Adaptive Modulation and Coding (AMC) subchannel to the terminal;
- receiving a first per band differential CQI over a second control channel after receiving the broadband CQI;
- and
- updating a CQI using the broadband CQI and the first differential CQI,
- wherein the broadband CQI comprises an average or median value of CQIs measured per band among the plurality of bands, and the first per band differential CQI has a value based on the comparison result between the broadband CQI and CQIs for the plurality of bands.
An apparatus of a terminal in a broadband wireless communication system, the apparatus comprising:
- a controller configured to check that a band Adaptive Modulation and Coding (AMC) subchannel is allocated;
- and
- a Channel Quality Indicator (CQI) determiner configured to generate and transmit a broadband CQI for a plurality of bands to a base station over a first control channel, the CQI determiner further configured to generate and transmit a first per band differential CQI relating to the band AMC subchannel allocated to the base station over a second control channel,
- wherein the broadband CQI comprises an average or median value of CQIs measured per band among the plurality of bands, and the first per band differential CQI has a value based on the comparison result between the broadband CQI and CQIs for the plurality of bands.
An apparatus of a base station in a broadband wireless communication system, the apparatus comprising:
- a subchannel allocator configured to allocate a band Adaptive Modulation and Coding (AMC) subchannel to a terminal;
- a Channel Quality Indicator (CQI) manager configured to receive a broadband CQI for a plurality of bands over a first control channel and receive a first per band differential CQI over a second control channel from the terminal;
- and
- a differential CQI checker configured to update a CQI using the broadband CQI and the first differential CQI,
- wherein the broadband CQI comprises an average or median value of CQIs measured per band among the plurality of bands, and the first per band differential CQI has a value based on the comparison result between the broadband CQI and CQIs for the plurality of bands.
Dependencies are inferred from the claim text.