Computer Science – Networking and Internet Architecture
Scientific paper
2008-02-25
Computer Science
Networking and Internet Architecture
Scientific paper
To date, most analysis of WLANs has been focused on their operation under saturation condition. This work is an attempt to understand the fundamental performance of WLANs under unsaturated condition. In particular, we are interested in the delay performance when collisions of packets are resolved by an exponential backoff mechanism. Using a multiple-vacation queueing model, we derive an explicit expression for packet delay distribution, from which necessary conditions for finite mean delay and delay jitter are established. It is found that under some circumstances, mean delay and delay jitter may approach infinity even when the traffic load is way below the saturation throughput. Saturation throughput is therefore not a sound measure of WLAN capacity when the underlying applications are delay sensitive. To bridge the gap, we define safe-bounded-mean-delay (SBMD) throughput and safe-bounded-delay-jitter (SBDJ) throughput that reflect the actual network capacity users can enjoy when they require bounded mean delay and delay jitter, respectively. The analytical model in this paper is general enough to cover both single-packet reception (SPR) and multi-packet reception (MPR) WLANs, as well as carrier-sensing and non-carrier-sensing networks. We show that the SBMD and SBDJ throughputs scale super-linearly with the MPR capability of a network. Together with our earlier work that proves super-linear throughput scaling under saturation condition, our results here complete the demonstration of MPR as a powerful capacity-enhancement technique for both delay-sensitive and delay-tolerant applications.
Chen Darui
Liew Soung Chang
Zhang Ying Jun
No associations
LandOfFree
Delay Analysis for Wireless Local Area Networks with Multipacket Reception under Finite Load does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Delay Analysis for Wireless Local Area Networks with Multipacket Reception under Finite Load, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Delay Analysis for Wireless Local Area Networks with Multipacket Reception under Finite Load will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-603312