Abstract
Considering that weak channel collision detection ability, long propagation delay and heavy load in LEO satellite communications, a valid adaptive APRMA MAC protocol was proposed. Different access probability functions for different services were obtained and appropriate access probabilities for voice and data users were updated slot by slot based on the estimation of the voice traffic and the channel status. In the proposed MAC protocol limited wireless resource is allocated reasonably by multiple users and high capacity was achieved. Three performance parameters: voice packet loss probability, average delay of data packets and throughput of data packets were considered in simulation. Finally simulation results demonstrated that the performance of system was improved by the APRMA compared with the conventional PRMA, with an acceptable trade-off between QoS of voice and delay of data.
Highlights
Due to various economic and technical constraints, terrestrial mobile networks can only provide communication services with a limited coverage
Considering that weak channel collision detection ability, long propagation delay and a mass of load in communication system in low earth orbit (LEO) satellites, an adaptive access control protocol improved form PRMA based on channel status, quality of service and estimation of traffic was proposed with priority of voice traffic referred to [10,11]
Appropriate access probabilities Pv and Pd are broadcast from the LEO satellite, which is updated slot by slot based on the estimation of the voice traffic and the channel status
Summary
Due to various economic and technical constraints, terrestrial mobile networks can only provide communication services with a limited coverage. Considering that weak channel collision detection ability, long propagation delay and a mass of load in communication system in LEO satellites, an adaptive access control protocol improved form PRMA based on channel status, quality of service and estimation of traffic was proposed with priority of voice traffic referred to [10,11]. In this method, voice packets access to the channel with a priority and a updated access probability and if the resource is available, data packets can be accepted with an updated access probability slot by slot.
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