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A Performance Evaluation of CF-Poll Piggyback Algorithm for HCCA  

Lee Hyun-Jin (아주대학교 정보통신대학 전자공학부)
Kim Jae-Hyun (아주대학교 정보통신대학 전자공학부)
Cho Sung-Hyun (삼성전자주식회사 정보통신총괄 통신연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.9B, 2006 , pp. 785-791 More about this Journal
Abstract
A CF-Poll frame which contains the channel reservation time can be piggybacked in QoS-Data frame to increase the channel efficiency in HCCA. However, if any QSTA in the network uses the low physical transmission rate, the QoS-Data frame which includes the CF-Poll frame must be transmitted by the minimum transmission rate. Therefore, it can cause the decrease of the channel efficiency and the increase of the frame transmission delay for other traffic streams when any QSTA has the low physical transmission rate. In this paper, we define this phenomenon as the piggyback problem at the low physical transmission rate and evaluate the effect of this problem. In the simulation results, when a CF-Poll piggyback is used, the delay is increased about 25% if any QSTA has the low physical transmission rate, while the delay is decreased about 7.8% if all QSTA has the high physical transmission rate. We also found that the gain of the CF-Poll piggyback mechanism is achieved when all QSTA has higher physical transmission rate than 24 or 36Mbps.
Keywords
WLAN; HCCA; Piggyback; Optimization; MAC;
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