Soft Reservation Multiple Access with Priority Assignment (SRMA/PA): A Distributed MAC Protocol for QoS-Guaranteed Integrated Services in Mobile Ad-Hoc Networks

Chang Wook AHN  Chung Gu KANG  You-Ze CHO  

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.1    pp.50-59
Publication Date: 2003/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
ad-hoc networks,  medium access control,  integrated services,  QoS support,  

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A new distributed medium access control (MAC) protocol--Soft Reservation Multiple Access with Priority Assignment (SRMA/PA) protocol--is introduced for supporting the integrated services of real-time and non-real-time applications in mobile ad-hoc networks. The SRMA/PA protocol allows the distributed nodes to contend for and reserve time slots with RTS/CTS-like "collision-avoidance" handshake and "soft reservation" mechanism augmented with distributed and dynamic access priority control. The SRMA/PA protocol realizes distributed scheduling for guaranteeing QoS requirements of integrated services and maximizes statistical multiplexing gain. We have demonstrated by simulation studies that the multiplexing gain can be improved significantly without unduly compromising on system complexity. Moreover, we have shown that the proposed back-off mechanism designed for delay-constrained services is useful for further improving utilization of the channel.