Low Latency MAC Protocol in Wireless Sensor Networks Using Timing Offset

Seung Sik CHOI  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.2   pp.615-618
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.615
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
latency control,  S-MAC,  sensor networks,  

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This paper proposes a low latency MAC protocol that can be used in sensor networks. To extend the lifetime of sensor nodes, the conventional solution is to synchronize active/sleep periods of all sensor nodes. However, due to these synchronized sensor nodes, packets in the intermediate nodes must wait until the next node wakes up before it can forward a packet. This induces a large delay in sensor nodes. To solve this latency problem, a clustered sensor network which uses two types of sensor nodes and layered architecture is considered. Clustered heads in each cluster are synchronized with different timing offsets to reduce the sleep delay. Using this concept, the latency problem can be solved and more efficient power usage can be obtained.