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In demand assignment protocol, resources are granted on the basis of demand, governing some rules, policies in resource assignment and after the completion of need, resources are released back to the central pool for further requests. In star topology TDM/TDMA network of very small aperture terminals with a common request channel, a large number of participating terminals generate signalling packets on the request channel. It is desired that these terminals have higher chances of successful access to the media with a minimal number of the collision over the shared channel. Under these circumstances, the performance of the media access protocol is really crucial. Aloha is the simplistic technique to access the shared channel but suffers from extremely low throughput. Its successor slotted Aloha improves the throughput by cutting down the vulnerable period to half by agreeing on transmission at slot boundaries. This improvement is also not adequate to provide the better chances of packets getting through when multiple nodes are participating. The large latency network where one hop delay is of the order of 270 ms, feedback time and timeouts are also of high order this further worsen the problem. A self-managed access scheme for demand request that tries to reduce the collision by managing the multiple requests and distributing them over different slots is proposed.

Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network