一种基于碰撞等待的BE业务带宽请求方案  

A BE Services Bandwidth Request Scheme Based On Collision Waiting

作　　者：刘马飞[1,2] 曾学文[2] 倪宏[2] 

机构地区：[1]中国科学院研究生院,北京100190 [2]中国科学院声学研究所国家网络新媒体工程技术研究中心,北京100190

出　　处：《微计算机应用》2010年第8期13-18,共6页Microcomputer Applications

基　　金：国家科技支撑计划"移动多媒体广播传输系统技术研究与设备开发";2008BAH25B03

摘　　要：地面多媒体广播双向化系统需要支持交互广播、数据和话音业务,并能够为用户提供QoS保证。本文根据地面多媒体广播双向化系统的需求,提出一种基于碰撞等待的BE(Best Effort,尽力而为)业务带宽请求方案。相比于传统的截断二进制指数退避竞争,该方案能够获得较高的带宽请求机会利用率和较低的带宽请求丢弃概率,同时具有自适应于网络负荷以及终端当前状态的特性,使得在各种荷载条件下均能为BE业务提供较好的带宽请求性能。The bi-directional terrestrial multimedia broadcast system needs to support the interactive broadcast,data and voice service,and to supply users with QoS assurance.A BE services bandwidth request scheme based on collision waiting was proposed to meet the need of bi-directional terrestrial multimedia broadcast system.The proposed scheme can automatically accommodate itself to the network bandwidth request load,the number of transmission opportunity per frame and the times of sending attempt of the current bandwidth request.The simulation results show that the proposed scheme can maintain higher utilization of bandwidth request transmission opportunity and lower drop probability of bandwidth request,compared to the traditional Truncated Binary Exponential Backoff scheme.

关 键 词：地面多媒体广播双向化系统 BE业务 带宽请求 截断二进制指数退避 碰撞等待 

分 类 号：TN943[电子电信—信号与信息处理]