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

  • Trilok Kumar Saini Defence Electronics Applications Laboratory (DEAL), Defence Research and Development Organization (DRDO)
  • S. C. Sharma Indian Institute of Technology, Roorkee - 247 667, India
Keywords: Random access, slotted Aloha, media access control, signaling, terminal

Abstract

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 VSATs, large number of participating terminals generate signaling packet on common demand request channel. It is desired that these signaling terminals to have higher chances of successful access to the media and at the same time with minimal number of collision over the shared channel. Under these circumstances, performance of media access protocol is really crucial. Aloha is the simplistic technique to access the shared channel but suffers from extremely low throughput. Its immediate 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 270ms, feedback time and timeouts are also of high order this further worsen the problem. In this paper, we propose self-managed access scheme for demand request that tries to reduce the collision by managing the multiple requests and distributing them over different slots.

Author Biographies

Trilok Kumar Saini, Defence Electronics Applications Laboratory (DEAL), Defence Research and Development Organization (DRDO)
DEAL(DRDO) , Scientist - 'E'
S. C. Sharma, Indian Institute of Technology, Roorkee - 247 667, India

Dr S.C. Sharma received MSc, MTech and PhD from IIT Roorkee (erstwhile UOR) in 1981, 1983, and 1991 respectively. he is a professor at Indian Institute of Technology Roorkee. his research interest includes wireless and cloud computing, ad hoc, and sensor networks. he has published more than 130 research papers in journals/conferences.
In current study, he guided to improve the concept.

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Published
2019-01-10
How to Cite
Saini, T., & Sharma, S. (2019). Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network. Defence Science Journal, 69(1), 80-86. https://doi.org/10.14429/dsj.69.11992
Section
Electronics & Communication Systems