Abstract
Transmission opportunity (TXOP) is a key factor to enable efficient channel bandwidth utilization over wireless campus networks (WCN) for interactive multimedia (IMM) applications. It facilitates in resource allocation for the similar categories of multiple packets transmission until the allocated time is expired. The static TXOP limits are defined for various categories of IMM traffics in the IEEE802.11e standard. Due to the variation of traffic load in WCN, the static TXOP limits are not sufficient enough to guarantee the quality of service (QoS) for IMM traffic flows. In order to address this issue, several existing works allocate the TXOP limits dynamically to ensure QoS for IMM traffics based on the current associated queue size and pre-setting threshold values. However, existing works do not take into account all the medium access control (MAC) overheads while estimating the current queue size which in turn is required for dynamic TXOP limits allocation. Hence, not considering MAC overhead appropriately results in inaccurate queue size estimation, thereby leading to inappropriate allocation of dynamic TXOP limits. In this article, an enhanced dynamic TXOP (EDTXOP) scheme is proposed that takes into account all the MAC overheads while estimating current queue size, thereby allocating appropriate dynamic TXOP limits within the pre-setting threshold values. In addition, the article presents an analytical estimation of the EDTXOP scheme to compute the dynamic TXOP limits for the current high priority traffic queues. Simulation results were carried out by varying traffic load in terms of packet size and packet arrival rate. The results show that the proposed EDTXOP scheme achieves the overall performance gains in the range of 4.41%—8.16%, 8.72%—11.15%, 14.43%—32% and 26.21%—50.85% for throughput, PDR, average ETE delay and average jitter, respectively when compared to the existing work. Hence, offering a better TXOP limit allocation solution than the rest.
Highlights
Recent enhancements in wireless networking technologies coupled with improvements in computing power and storage capabilities have widened the scope of interactive multimedia (IMM) applications
The performance of enhanced dynamic TXOP (EDTXOP) scheme is compared with the performance of the static TXOP (STXOP) [11], TBD-TXOP [13, 16]
Impact of the increasing traffic load based on the variation of packet sizes the traffics load is increased from 100 to 1200 kbps with respect to the variation of different packet sizes
Summary
Recent enhancements in wireless networking technologies coupled with improvements in computing power and storage capabilities have widened the scope of interactive multimedia (IMM) applications. These applications are diverse from online video streaming [1,2,3] to multimedia messaging [4,5,6] and have different Quality of Service (QoS) requirements. Existing DCF protocol does not guarantee the QoS requirements of IMM traffic due to limited support for real-time services To address this issue, an amendment to IEEE 802.11 standard known as IEEE 802.11e [11] was introduced that consists of a contention-based channel access protocol called enhanced distributed channel access (EDCA). EDCA offers service differentiation function by categorizing the traffic stream into four different access categories (ACs) namely voice, video, best effort, and background [11]
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