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In this paper we evaluate the performance of a dual-radio 802.11-based mesh network in which each mesh node adheres to a transmission schedule negotiated with peers to avoid interfering with one another when transmitting delay sensitive traffic (e.g. conversational voice). A comparison is made between the performance of scheduled access for delay sensitive traffic and the contention-based Enhanced...
Wireless mesh networks provide a flexible yet cost- effective means to expand wireless coverage, but their performance can be limited without carefully managing station-to-AP associations to minimize the total end-to-end resource impact. The received signal strength-based approach that is commonly used by 802.11 devices can lead to inefficient use of network resources in a mesh network. In this paper...
The 802.11e amendment to IEEE 802.11 standard defines a block acknowledgement (ACK) mechanism to reduce the overhead required by a station to acknowledge the receipt of multiple frames. This paper presents an analytic model for estimating the overhead required to selectively retransmit data frames when using the block ACK mechanism in a noisy channel. This model is applicable both to the present block...
In this paper we propose and evaluate the performance of techniques for controlling the delivery of traffic to WLAN stations in power save mode. The options evaluated include using unscheduled automatic power save delivery for delay sensitive traffic while requiring stations to poll for traffic from delay tolerant applications, versus using unscheduled power save delivery for both types of traffic...
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