Title :
Channel adaptive CQI reporting schemes for HSDPA systems
Author :
Jeon, Soo-Yong ; Cho, Dong-Ho
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon
fDate :
6/1/2006 12:00:00 AM
Abstract :
HSDPA (high-speed downlink packet access) is an evolved UMTS packet scheme that delivers increased user peak data rates and quality of service. A key technique supporting HSDPA is adaptive modulation and coding (AMC), in which the modulation scheme and the coding rate are changed adaptively according to the downlink channel quality reported by the user equipment (UE). Therefore, the channel quality indication (CQI) reporting scheme is directly related to the accuracy of AMC and the performance of HSDPA. This letter proposes channel adaptive CQI reporting schemes in which UEs report the CQI value intelligently by using information about channel quality. With the proposed schemes, the battery capacity of UE can be conserved and the uplink interference can be lowered by filtering off redundant CQI reports or the transmission error rate can be lowered by fast CQI reports
Keywords :
3G mobile communication; adaptive codes; adaptive modulation; channel capacity; modulation coding; packet radio networks; quality of service; radio access networks; radio links; radiofrequency interference; AMC; HSDPA; UMTS packet scheme; adaptive modulation-coding; changed adaptive CQI reporting scheme; channel capacity; channel quality indication; filtering; high-speed downlink packet access; quality of service; universal mobile telecommunication system; uplink interference; 3G mobile communication; Batteries; Downlink; Error analysis; Filtering; Interference; Modulation coding; Multiaccess communication; Prediction methods; Quality of service;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2006.1638615
