DocumentCode :
2513419
Title :
Comparisons of link adaptation based scheduling algorithms for the WCDMA system with high speed downlink packet access
Author :
Wang, Li-Chun ; Chen, Ming-Chi
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Volume :
5
fYear :
2004
fDate :
17-19 May 2004
Firstpage :
2456
Abstract :
The wideband code division multiple access (WCDMA,) system with high speed downlink packet access (HSDPA) is an important next generation wireless system. By adopting adaptive modulation, efficient scheduling, and hybrid automatic repeat request technologies, it can support data rates up to 10 Mbit/s in the mobile cellular environment. Among these techniques, the scheduling algorithm plays a key role in realizing the HSDPA concept A good scheduling algorithm should consider all the important factors including channel impact, delay issue, and fairness. In this paper, we suggest a fairness index to examine the fairness performance of current link adaptation based scheduling algorithms, including the maximum C/I, round robin, proportional fair, and exponential rule schedulers. When supporting multi-type services, we find that the fairness performance of current scheduling algorithms, including the round robin scheduler, can be improved further even though the round robin scheduler is viewed as the scheduler of the greatest fairness. Thus, we are motivated to develop a new scheduling algorithm, namely the queue-based exponential rule scheduler. Through simulations, we show that in the context of multi-type services the fairness performance of the queue-based exponential rule scheduler can outperform all the schedulers; in the time-multiplexing fashion, while maintaining good throughput and delay performance.
Keywords :
4G mobile communication; adaptive scheduling; cellular radio; code division multiple access; delays; packet radio networks; queueing theory; telecommunication network management; telecommunication traffic; HSDPA; WCDMA system; delay performance; fairness index; fairness performance; high speed downlink packet access; link adaptation; maximum C/I scheduler; mobile cellular environment; multi-type services; next generation wireless system; proportional fair scheduler; queue-based exponential rule scheduler; round robin scheduler; throughput; time multiplexing; wideband code division multiple access; Adaptive scheduling; Adaptive systems; Automatic repeat request; Context modeling; Delay; Downlink; Multiaccess communication; Round robin; Scheduling algorithm; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
ISSN :
1550-2252
Print_ISBN :
0-7803-8255-2
Type :
conf
DOI :
10.1109/VETECS.2004.1391364
Filename :
1391364
Link To Document :
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