학술논문
Performance Analysis of IEEE 802.11 WLANs With Saturated and Unsaturated Sources
Document Type
Periodical
Author
Source
IEEE Transactions on Vehicular Technology IEEE Trans. Veh. Technol. Vehicular Technology, IEEE Transactions on. 61(1):333-345 Jan, 2012
Subject
Language
ISSN
0018-9545
1939-9359
1939-9359
Abstract
This paper proposes a comprehensive but tractable model of IEEE 802.11 carrying traffic from a mixture of saturated and unsaturated (Poisson) sources, with potentially different quality-of-service (QoS) parameters, i.e., TXOP limit, $CW_{\min}$ , and $CW_{\max}$. The model is used to investigate the interaction between these two types of sources, which is particularly useful for systems seeking to achieve load-independent “fair” service differentiation. We show that, when the TXOP limit for unsaturated sources is greater than one packet, batches are distributed as a geometric random variable clipped to TXOP limit. Furthermore, we present asymptotic results for access delay distribution, which indicates that it is infeasible to obtain real-time service in the presence of eight or more saturated sources, regardless of the real-time traffic load, given that all stations use a $CW_{\min}$ of 32.