An efficient packet sensing MAC protocol for wireless networks

Authors:
Andrew Muir;J. J. Garcia-Luna-Aceves
Affiliations:
Univ. of California, Santa Cruz;Univ. of California, Santa Cruz
Venue:
Mobile Networks and Applications - Special issue on protocols and software paradigms of mobile networks
Year:
1998

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Abstract

The Group Allocation Multiple Access with Packet-Sensing (GAMA-PS) protocol for scheduling real-time and datagram traffic in a wireless LAN is specified and analyzed. By maintaining a dynamically-sized cycle that changes in length depending on the amount of network traffic, GAMA-PS is able to efficiently control channel access while ensuring that there are no collisions of data packets. Each cycle contains a contention period and a group-transmission period; a station with data to send competes for membership in the “transmission group” by using packet sensing to successfully complete an RTS/CTS message exchange during the contention period. Once a station is a member of the transmission group, it is able to transmit a collision-free data packet during each cycle; as long as a station has data to send, it maintains its position in the group.