摘要： 为了公平地实现卫星通信网络带宽分配,尽可能地减少资源浪费,满足不同优先级业务的带宽需求,提出一种基于令牌桶的带宽分配改进方法。该方法在原有每一个优先级对应一个令牌桶的基础上,对不同优先级的业务设定不同的业务权值,以自适应业务速率的变化,通过业务权值的占用比例动态分配令牌资源,利用令牌桶嵌入漏桶机制实现对业务占用的带宽进行二次分配,根据业务优先级的高低对溢出的令牌实现依次填充,从而减少资源浪费。仿真结果表明,与令牌桶的动态带宽分配方法相比,该方法可有效提高网络的吞吐量,在保证高优先级业务带宽需求的同时,使低优先级业务公平地获取带宽资源。
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
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