Control channel element detection method using CQI in a wireless communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsHee Young Park, Seong Wook Song, Hun Kee Kim
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Abstract
A control channel element detection method and apparatus is provided for detecting the Control Channel Elements (CCEs) carrying control information for a mobile station using a Channel Quality Indicator (CQI). A CCE detection method includes searching a current subframe for CCEs, and locating the CCEs carrying control information for the mobile station by decoding the current subframe with variable code rates. Searching for the CCEs includes searching the current subframe for the CCEs carrying the control information for the mobile station while changing a size type of the CCEs according to a result of a comparison between a CQI of the current subframe and a CQI of a previous subframe.
Claims6
A Control Channel Element (CCE) detection method of a mobile station using a Channel Quality Indicator (CQI) in a wireless communication system, comprising:
- searching a current subframe for CCEs;
- and
- locating the CCEs carrying control information for the mobile station by decoding the current subframe,
- wherein searching the current subframe for the CCEs comprises searching the subframe for the CCEs carrying the control information for the mobile station while changing a searching order for an aggregation level using a size type of the CCEs according to a result of a comparison between a current CQI and a previous CQI, and
- wherein the size type is indicative of a number of CCEs used for transmitting a Physical Downlink Control Channel (PDCCH),
- wherein locating the CCEs further comprises determining whether the current subframe includes a scheduling grant for the mobile station, and
- wherein searching the current subframe for the CCEs comprises:
- comparing the CQI of the current frame with the previous CQI;
- searching, when the current CQI is greater than the previous CQI, for CCEs with a size type less than a size type of CCEs of the previous subframe in the current subframe;
- and
- searching, when the current CQI is equal to or less than the previous CQI, for CCEs with a size type greater than the size type of the CCEs of the previous subframe in the current subframe.
A Control Channel Element (CCE) detection apparatus of a mobile station, comprising:
- a CCE controller arranged for searching a current subframe for CCEs;
- a decoder arranged for decoding the current subframe, when the CCEs are found;
- a determiner arranged for determining whether the CCEs carried by the subframe are transmitted for the mobile terminal, based on a result of decoding the current subframe;
- and
- a CQI comparator that compares a current Channel Quality Indicator (CQI) with a previous CQI,
- wherein the CCE controller is arranged for decoding the subframe for the CCEs by changing a searching order for an aggregation level_using a size type of the CCEs according to a result of a comparison between the current CQI and the previous CQI,
- wherein the size type is indicative of a number of CCEs used for transmitting a Physical Downlink Control Channel (PDCCH),
- wherein the determiner determines whether the current subframe includes a scheduling grant for the mobile station, and
- wherein the CCE controller begins searching CCEs with a size type less than a size type of CCEs of the previous subframe in the current subframe, when current CQI is greater than the previous CQI, and begins searching CCEs with a size type greater than the size type of the CCEs of the previous subframe in the current subframe, when the current CQI is equal to or less than the previous CQI.
Dependencies are inferred from the claim text.