A MULTIPLE-CHANNEL FREE-ACCESS COLLISION RESOLUTION ALGORITHM-BASED CONNECTION REQUEST PROCEDURE FOR LAND MOBILE SATELLITE NETWORKS

A new binary feedback multiple-channel free-access (MCFA) collision re solution algorithm (CRA) based random-access protocol (RAP) is devised to implement the connection request procedure for demand-assigned cha nnel access protocols in land mobile satellite communications networks . The maximum stable throughput of this protocol is derived and is sho wn to be superior to a previously devised multiple-channel obvious blo cked-access CRA based RAP as well as to slotted ALOHA. The throughput performance is also superior to the previously devised multiple-channe l window blocked-access CRA based RAP for four or more channels. An ex act analysis of the average packet delay for this MCFA CRA based RAP i s given and shown to be in excellent agreement with computer simulatio n results, The protocol is shown to have smaller average delays than t he best single-channel free access CRA based RAPs over a wide range of practically usable throughput rates with reasonable delays. This MCFA CRA based RAP was implemented on a channel request protocol test-bed simulator which incorporates the physical link characteristics of the MSAT-X land mobile satellite system. These testbed simulation results also demonstrate the superiority of this protocol over slotted ALOHA f or both error-free channel and mobile facing channel scenarios.