Priority-Based Medium Access Control Protocol for Providing QoS in Wireless Sensor Networks

Kwang-Jin PAEK  Jongwan KIM  Ui-Sung SONG  Chong-Sun HWANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E90-D   No.9   pp.1448-1451
Publication Date: 2007/09/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e90-d.9.1448
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Networks
MAC,  CSMA,  TDMA,  QoS,  priority-based,  wireless sensor networks,  

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In this letter, we propose PQ-MAC: a priority-based medium access control (MAC) protocol for providing quality of service (QoS) in wireless sensor networks (WSNs) which minimizes the energy consumption with traffic-based sleep-wakeup scheduling and supports QoS using differentiating channel access policy, packet scheduling, and queue management. The PQ-MAC utilizes the advantages of time division multiple access (TDMA) and slotted carrier-sense multiple access (CSMA). The proposed protocol is an energy-efficient, priority-based, and QoS compatible MAC protocol. It consists of multi-level queue management, sleep-wakeup scheduling, and an ordered contention period (CP) scheme. It also guarantees time-bounded delivery of QoS packets. Performance evaluation is conducted between PQ-MAC and S-MAC with respect to three performance metrics: energy consumption, throughput, and average latency. The simulation results show that the performance of PQ-MAC is better than that of S-MAC.