关键词: 卫星网络, 动态自适应, 带宽分配, 令牌桶, 漏桶, 吞吐量

Abstract: In order to allocate the bandwidth equitably,reduce resource waste and satisfy the bandwidth requirement of different priority traffic in a satellite communication network,an improved bandwidth allocation method based on dynamic token bucket is proposed.In this method,the strategy that each priority level corresponds to a token bucket is improved.The leaky buckets are embedded in the token buckets so that the bandwidth is allocated twice.To adapt to the changes of traffic rate,traffic weight is set for diffident priority traffic,and tokens can be allocated dynamically by the occupation ratio of traffic weight.At the same time,the overflow tokens can be also allocated accordingly by the difference of the traffic priority so as to reduce resource waste.Simulation results show that compared with to Dynamic Bandwidth Allocation Algorithm with Token Bucket(DBAATB),the throughput of satellite communication network of this method can be improved effectively,the bandwidth requirement of the high priority traffic can be satisfied,and the low priority traffic can achieve the bandwidth resource equitably.

Key words: satellite network, dynamic self-adapting, bandwidth allocation, token bucket, leaky bucket, throughput