Versatile medium access control (VMAC) protocol for mobile sensor networks

Abstract

In this thesis, the problem of mobility handling in wireless sensor network is introduced with an appreciation for the applications that may be possible once the problem is resolved.Mobility handling is solved with a simple priority backoff technique inspired by novel MAC protocols. To incorporate this technique for stationary and mobile sensor nodes, a hybrid MAC protocol called VMAC is designed with a fixed frame length. VMAC combines the advantages of scheduled-based MAC for energy savings and contention-based MAC for short transmission delays. To exploit network bandwidth, channel reuse is encouraged and is readily integrated into the protoco\. To evaluate VMAC and its performance when compared to other MAC protocols, an implementation inside NS-2 is conducted with simulations of various topologies.These topologies vary in hop-count from source to destination and also contention levels.Simulation results show that VMAC with certain frame lengths are suited for selected topologies, but the frame length of cne can always provide sufficient performance. The backoff technique is shown to be fair when nodes contend for medium access and it is even resourceful in speeding up hardware address resolution and routing. III * 1J!J~c~;JiA~~-~t-¥ ~u~ ~ :fiP.~iift* ~lH* !!~~;R*!1i~~¥IJ ~¥*~HltftHIj ~o~ #,+,#,+,+Last but not least, I would like to thank my friends for their encouragement and the great times we had together and hopefully many more great memories to come.

Research Pathway towards MAC Protocol in Enhancing Network Performance in Wireless Sensor Network (WSN)

“…The mechanism under multiple channel condition duplicates the throughput and performs the efficient operation as compared to the Single channel operation. Vincent et al [15] have presented the concept of versatile MAC protocol that defines mobility handling issue of WSN. The model of VMAC combines the energy saving schedule based, and CBMAC protocol for short range of communication.…”

A schedule-based medium access control protocol for mobile wireless sensor networks

“…It should be noted that the effectiveness of VMAC in terms of throughput and end‐to‐end delay was already established in . Part of the study performed in this paper is to conduct additional simulations by using other related performance metrics.…”

“…In this paper, we focus on using the MAC layer as a way for controlling and synchronizing the node's states for energy efficiency purpose. More precisely, we continue the investigation of our recently proposed Versatile MAC (VMAC) protocol for mobile WSNs , which was proven to deal with both static and mobile scenarios. In VMAC, the access competition to time slots involved a contention window (CW) that prefixes the transmission slots, and mobile nodes were given priority access to these transmission slots compared with stationary nodes.…”

“…This paper extends from the work presented in in the following aspects: (1) a more comprehensive literature review is presented; and (2) additional simulations are conducted, which include (i) comparing VMAC against time division multiple access (TDMA) and 802.11 with request to send/clear to send (RTS/CTS) protocols in terms of bandwidth utilization by using various VMAC frame lengths (FLs), (ii) studying the individual node fairness, that is, how successful a node is in accessing the medium when it makes an attempt, and (iii) quantifying the energy remaining at each node under additional scenarios.…”

“…An abridged version of this paper appeared in the Proceedings of the 7th International Wireless Communications and Mobile Computing Conference (IWCMC 2011), Istanbul, Turkey, 5–8 July 2011.…”