一般的随机访问信道（RACH），延时特性只有均值，很难有明确的上限保证，所以对部分实时业务性能难以保证。树型算法则可以对目前处理的业务提供明确的延时上限，然而一般的固定树型算法对于无线信道的业务波动情况没有适应能力，例如树型分支固定，只能适合一定强度的到达业务，其他情况下会导致信道利用率下降和延时增加。本文针对随机访问信道协议，在固定树型算法的基础上，结合随机接续协议，给出了一种混合动态树型算法，目的是提高一般树型算法的信道利用率，保证延时指标的上限。

前向纠错（FEC）主要用于提高信道的传输性能，在ATM信元头中有CRC纠错方案HEC，但是主要是针对光纤等优良信道。对于干扰严重的无线信道，应有更有力的纠错方案。本文是在信道编码方案确定的条件下，提出进一步提高纠错能力、降低信元丢失率的方法。

本文以不同的业务模型作基础，分析无线ATM网络信道资源的动态分配算法本身的特征参数，如方差的变化、帧长的分布等，目的是判断动态资源分配协议是否适合特定业务，以期为动态算法的设计提供参考，并保证系统的服务质量（QoS）；同时可以在已知业务模型的条件下，为简化动态算法设计提供依据。同时采用计算和计算机仿真的方法，对不同业务模型进行了分析，结果显示了协议的特征参数随业务变化，这些参数可以描述所设计的协议性能。

针对集群通信系统的特点，提出在服务覆盖区域以外建立自主式基站，可以在不建立新的系统的条件下，有效扩展原有系统的服务区域。同时，所有的用户判别、鉴权可以做到与原有主系统一致。自主式基站如果与移动基站系统结合，则可以更加有效地实现集群系统的通信指挥和服务区的快速建立与移动。

Recent advances in portable computing and wireless technologies are opening up exciting possibilities for the future of wireless mobile networking. A Mobile Ad hoc network (MANET) consists of mobile platforms which are free to move arbitrarily. This is in contrast with the topology of the existing Internet, where the router topology is essentially static. In a MANET, the nodes are mobile and inter-node connectivity may change frequently during normal operation. In this paper we will focus our attention on one of current protocols, AODV. We also present a typical ad hoc network topology model. At last simulation results are given to show the efficiency in the ad hoc networks. The main result derived from our investigation is that the efficiency of multi-hop drops step by step, then it will keep a steady level, while the node density has no influence over the efficiency.

In wireless networks, packet access is a popular mode and the key problem is how to improve throughput and access delay performance under limited frequency resource. Based on an existence model, this paper proposes a dynamic parameter protocol model based on packet CSMA/CD and gives out the theoretical analysis and simulation results that are compared with a model in existence. The comparison shows an improvement of throughput and access delay performance, specially the throughput for wireless channel, and these results could be reference to not only wireless channel but also common MAC protocol.

This paper presents a new design of reservation-based medium access protocol-dynamic frame packet reservation multiple access (DF-PRMA) - for wireless ATM environment and gives the performance analysis of delay and channel throughput after setting up a mathemic model. This protocol has daptbility to the fluctuation of traffic by controling frame length dynamically while it can guarantee teh delay performance by forced collision and special reservarion slot. All these can give a limited access delay and keep the QoS level and a resonable high channel throughput.

MPT-1327信令是一种公开的国际性标准，其纠检错采用BCH（63,48）加一位奇偶校验编码格式，本文通过计算和模拟的方法，分析了这种编码的性能，介绍并实现了一种纠检错的方法。

presents an improved protocol algorithm i-DSA++ based on DSA++ to reduce the delay performance for the real time traffic in the wireless ATM network and keep the channel throughput at a relatively high level and analyzes the channel throughput, delay and cell loss ratio(CLR) under the same assumption for i-DSA++ and DSA++.

Wide band or broadband access was paid much attention with the development of radio transmission technique. The wireless access control procedure play an important role in this type of system and efficiency of control algorithm has a great impact on throughput of channel resource. Based on wide band network control model and the characteristics of radio channel, this paper proposed a channel traffic estimation method and then performed a dynamic parameter control procedure and give detail analysis on estimation error and its impact on channel throughput and delay performance. Computation and simulation of system performance show a positive solution on system design.