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

fYear

2006

fDate

11-14 Sept. 2006

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/PIMRC.2006.253983

Filename

4022755