Traffic-Adaptive, Flow-Specific Medium Access Control for Wireless Networks

Abstract

Abstract-In this paper, we formally introduce the novel concept of traffic-adaptive, flow-specific medium access control and show that it outperforms contention, non-contention and hybrid medium access schemes. A traffic-adaptive, flow-specific mechanism is proposed that utilizes flow-specific queue size statistics to select between medium access modes. A general model for traffic-adaptive, flow-specific medium access control is developed and it is shown that hybrid medium access as well as traditional contention-based and non-contention schemes can be seen as special cases of the more general flow-specific access. The proposed traffic-adaptive, flow-specific mechanism is applied to Cooperative Wireless Sensor Network Medium Access Control (CWS-MAC) to provide representative simulation results.

Energy-efficient, flow-specific medium access using preamble sampling

“…The non-contention and contention modes of this flow-specific protocol are implemented as in [1]. The underlying noncontention scheme is developed around a TDMA frame structure while the contention mode is based on a slotted ALOHA approach.…”

“…Recent work has identified the delay and throughput performance advantages of a flow-specific medium access solution for wireless networks [1], [2]. The traffic-adaptive Cooperative Wireless Sensor Medium Access (CWS-MAC) protocol [1] has been proposed to provide either contention or non-contention medium access service on a per flow basis.…”

“…The traffic-adaptive Cooperative Wireless Sensor Medium Access (CWS-MAC) protocol [1] has been proposed to provide either contention or non-contention medium access service on a per flow basis. This approach has been shown to outperform contention [3], non-contention [4] and hybrid [5] medium access solutions for both traditional [1] and large-scale wireless sensor networks [2].…”

“…We accomplish this by incorporating an adaptive sleep and wake cycle into the traffic-adaptive CWS-MAC protocol [1] using preamble sampling. This adaptive sleep and wake cycle responds to changes in traffic load and we introduce a preamble sampling probability parameter that is capable of managing the trade-off between energy efficiency and throughput and delay performance.…”

“…PROPOSED ENERGY-EFFICIENT, FLOW-SPECIFIC MEDIUM ACCESS SCHEME Our proposed energy-efficient flow-specific medium access control scheme is based on the traffic-adaptive Cooperative Wireless Sensor Medium Access Control (CWS-MAC) protocol [1]. We modify the work of [1] by adding a sleep state during which sensor nodes power down their transceiver and processor to reduce energy consumption. Individual nodes participate in a sleep and wake cycle that is coordinated through the use of preamble sampling.…”