Title :
A Channel-State Aware Scheduling Mechanism for Wireless Local Area Networks
Author :
Zhou, Xinyun ; Niu, Jianwei ; Sun, Limin ; Sheng, Lingzhi
Author_Institution :
Inst. of Software, Chinese Acad. of Sci., Beijing
Abstract :
In this paper, the influence of wireless channel fading on packet loss and delay for wireless local area networks is studied in detail. It shows that in CSMA/CA MAC scheme, packets with bad channel state will engross MAC buffer and deteriorate other downlink flows´ performance. To overcome this problem, a novel channel state aware scheduling algorithm is presented to reduce the QoS degradation caused by channel fluctuation. It schedules every downlink flow into separated LLC layer queue firstly. Then, aided by the physical layer information, SNR, a channel flag based queue selection algorithm is used to isolate traffics with high PER (packet error rate). Simulation study shows this cross-layer scheme can decrease sending delay and packet loss for downlink real-time flows, and use wireless link resource more effectively
Keywords :
carrier sense multiple access; fading channels; quality of service; queueing theory; radio links; scheduling; wireless LAN; CSMA/CA MAC scheme; LLC layer queue; QoS; SNR; channel flag based queue selection algorithm; channel fluctuation; channel-state aware scheduling mechanism; downlink real-time flows; packet error rate; physical layer information; wireless channel fading; wireless link resource; wireless local area networks; Degradation; Downlink; Error analysis; Fading; Fluctuations; Multiaccess communication; Physical layer; Scheduling algorithm; Traffic control; Wireless LAN;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
1-4244-0329-4
Electronic_ISBN :
1-4244-0330-8
DOI :
10.1109/PIMRC.2006.253983
