Title :
Advanced HARQ and scheduler schemes in TDD-CDMA HSDPA systems
Author :
Peng, Mugen ; Wang, Wenbo
Author_Institution :
Center of Wireless Commun., Beijing Univ. of Posts & Telecommun., China
fDate :
29 Aug.-1 Sept. 2004
Abstract :
An enhancement HARQ method (E-HARQ) for TDD-CDMA supporting HSDPA techniques is firstly proposed. The basic idea is to discard the retransmission and change the modulation and coding when the link quality is lower than a pre-determined threshold. E-HARQ reduces the unnecessary retransmissions and makes MAC more efficient; hence the system performance improves. As compared to the change of MCS selections between HARQ retransmissions, the increase of system complexity due to E-HARQ is small. Furthermore, an advanced proportionally fair scheduling (APFS) algorithm is proposed, which aims at guaranteeing the long-term and short-term fairness as well as maximizing the system throughput These advanced adaptive techniques can improve the system throughput under the constraint of the user´s quality of service (QoS).
Keywords :
automatic repeat request; code division multiple access; computational complexity; modulation coding; quality of service; scheduling; time division multiplexing; QoS; TDD-CDMA HSDPA system; adaptive technique; advanced proportionally fair scheduling algorithm; enhancement HARQ method; quality of service; system complexity; Automatic repeat request; Downlink; MIMO; Modulation coding; Multiaccess communication; Proposals; Scheduling algorithm; System performance; Throughput; Wireless communication;
Conference_Titel :
Communications, 2004 and the 5th International Symposium on Multi-Dimensional Mobile Communications Proceedings. The 2004 Joint Conference of the 10th Asia-Pacific Conference on
Print_ISBN :
0-7803-8601-9
DOI :
10.1109/APCC.2004.1391653
