FUNDAMENTAL CHARACTERISTICS OF MULTIPLE-ACCESS SCHEMES FOR SATELLITE COMMUNICATION-NETWORKS

In multiple-access schemes for digital satellite communication, a coll ective arrangement is needed in which all the uncoordinated users may share a single satellite channel. The slotted ALOHA scheme is basicall y a random access scheme where the time axis is slotted and each earth station transmits packets at random. In this paper, the stability iss ues of the slotted ALOHA scheme and its useful limits are discussed fi rst. This gives the useful range of a basic type of random access sche me. Next, the instance conflict scheme is explained where multiple acc ess according to the demands of various users is possible. This scheme can satisfy the basic requirements of the satellite channel according to the demand of various users.