It works often in burst mode . the signal channel is complex and large . several protocols can be applied to the system : fixed addressing , committed addressing and stochastic addressing ( aloha ) protocols 系统使用的多址协议可以是固定分配地址的、按需分配地址的或者是随机接入的，这三种方式中，当网络用户数量大而业务量小，用户间歇工作时候，随机接入多址技术简单而高效。
Atm divides physical channel into several virtual channels for consumers according to different services and distributes web resources by consumers " request , which ensures the service quality and becomes the main technology in internet Atm采用时分复用技术，可将一个物理通道划分为不同业务特性的多条虚电路提供给用户，实现网络资源的按需分配，其服务质量的保证，使得atm正逐渐成为互联网骨干网的主流技术。
Therefore , the main goal of this thesis is to investigate a simple yet effective qos based fair scheduling scheme in order to provide desired bandwidth distribution among different flows sharing the channel in mobile ad hoc network environment 本论文围绕adhoc网络信道接入控制问题展开了深入讨论，致力于研究一个基于qos的简单有效的adhoc网络公平调度方法，实现共享信道中各竞争业务流之间网络带宽的按需分配。
