A Fully Distributed Approach to the Design of a KBIT/SEC VHF Packet Radio Network,
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)
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System design considerations for a Packet Radio network operating in the mobile tactical environment are outlined. Survivability is assessed to be of primary importance and a fully distributed approach in which all nodes are functionally equivalent and the network self-configuring is favored. Emphasis is placed on a description of the channel access CA, routing and congestion control algorithms. The CA algorithm is an adaptive CSMA scheme which is designed to maintain good throughout-delay performance irrespective of the number of active users and offered loading. It specifically includes features which compensate for hidden terminal effects in multiple hop networks. The routing strategy takes advantage of the inherent path redundancy of the semi-broadcast environment to offset the high packet loss rate due to collisions, interference and fading. Highlighted are those aspects which ensure effective routing in the face of rapid topological change and consequent out-moded routing data. Algorithm development has been aided by computer simulation using a finite state machine technique to model a realistic network of up to fifty nodes.
- Computer Systems
- Radio Communications