Abstract
Due to the half-duplex property of the sensor radio and the broadcast nature of wireless medium, limited bandwidth remains a pressing issue for wireless sensor networks (WSNs). The design of multi-channel MAC protocols has attracted the interest of many researchers as a cost effective solution to meet the higher bandwidth demand for the limited bandwidth in WSN. In this paper, we present a scheduled-based multi-channel MAC protocol to improve network performance. In our protocol, each receiving node selects (schedules) some timeslot(s), in which it may receive data from the intending sender(s). The timeslot selection is done in a conflict free manner, where a node avoids the slots that are already selected by others in its interference range. To minimize the conflicts during timeslot selection, we propose a unique solution by splitting the neighboring nodes into different groups, where nodes of a group may select the slots allocated to that group only. We demonstrate the effectiveness of our approach thorough simulations in terms of performance parameters such as aggregate throughput, packet delivery ratio, end-to-end delay, and energy consumption.
Highlights
Due to rapid technological advances, a certain geographical location can be visualized as a fully connected information space using fine granularity processing, which can be implemented using sensor technology
We consider a wireless sensor network (WSN) that monitors a vast terrain of interest via a large number of static sensor nodes and a data collection point called sink/base station
This WSN can be represented by an undirected graph G = (V,E), where V represents the set of all sensors in the network and E ⊂ V × V represents the set of communication links between any pair of nodes
Summary
Due to rapid technological advances, a certain geographical location can be visualized as a fully connected information space using fine granularity processing, which can be implemented using sensor technology. CSMA/CA schemes are well suited to spontaneous communication, but do not provide high channel utilization under heavy load. Another cost effective solution has drawn attention with the possibility to use multiple channels. The solution works for parallel data transmission based on the current WSN hardware, such as MICAz and Telos that provide multiple channels with single radio. Due to the small MAC layer packet size in WSN compared to general wireless networks, protocols such as [15,16,17] designed with RTS/CTS or 3-way handshake for channel/time negotiation provide significant control overhead for the constrained sensor nodes. We develop a schedule-based multi-channel MAC protocol for static wireless sensor networks.
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