MAC protocols are designed to coordinate the transmission of packets, retransmission of damaged packets, and resolution of collisions among stations during a contention period . The MAC protocols include fixed assignment protocol, demand assignment protocol, random access protocol, reservation protocol, hybrid of reservation protocol and random access protocols and adaptive protocols. Satellite communication systems have traditionally been designed for voice traffic. Multiple access protocols for conflict resolution have typically been channel-oriented with either fixed or demand assignment. Data communications, however, have much more diverse traffic characteristics and transmission requirements than voice communications. An access protocol suitable for wideband pack satellite network serving a finite number of bursty buffered users is proposed. The performance of the proposed scheme is evaluated and is compared with other protocols. Different stratergies for making reservations are considered. The performance criteria include high channel throughput, low transmission delay, channel stability and low complexity.
The MAC sublayer provides addressing and channel access control mechanisms that make it possible for several terminals or network nodes to communicate within a multiple access network that incorporates a shared medium, e.g. Ethernet. The hardware that implements the MAC is referred to as a medium access controller.
The MAC sublayer acts as an interface between the logical link control (LLC) sublayer and the network 's physical layer. The MAC layer emulates a full-duplex logical communication channel in a multi-point network. This channel may provide unicast, multicast or broadcast communication service.
FIXED-ASSIGNMENT MULTIPLE ACCESS PROTOCOLS
In fixed-assignment multiple access protocols, the allocation of channel bandwidth to a station is a
References: Medium Access Control Protocol in Satellite Communication, Hassan Peyravi, Kent State University. (IEEE communications magazine march 1999) Communication Networks (Basic Concepts And Key Architectures)- alberto leon- garcia & indra widja Medium Access Control Protocols for Space and Satellite Communications: A Survey and Assessment,H. Peyravi Satellite Packet Communication-Multiple Access Protocols and Performance.- Simon S.Lam, member, IEEE (IEEE transactions on communications, vol. com-27, no.10, october 1979).