通信工程文献翻译——摘要：基于竞争的分布式媒体接入控制(MAC)协议是IEEE802.11型无线局域网的基本组成部分。这些类型的MAC协议的不足之处主要来自于被用来信道竞争的空闲时隙和传输碰撞中产生的实习补偿。分配到不同长度的数据包也降低了系统的传输机会。本研究考虑了以上问题,提出了一种新的MAC方案以及所谓最大传输时间（MTT），用以加强无线局域网性能与特点。该方案允许每个站传送有大量数据包的传输机会而不是一个包。这种想法可以减少等候在每个传输周期时段的碰撞概率平均数。此外，为了确保各个测试站间的公平性，控制分配给每个站最大传输时间的突发传输长度，提出了一种分析性能模型，该模型通过计算得到了产量MTT方案。广泛的仿真实验表明，该方案可以显著提高的无线局域网高产量的性能，达到低延迟和高度的公平原则。

关键字：无线局域网；分布式 ；时间传输最大化 ；吞吐量；延迟 ；公平；模型分析

1．介绍

在无线局域网中，MAC协议是决定无线信道中有限通讯带宽利用效率的主要因素[7]。在不同的访问方法的基础上提出了多个用户访问程序的共享介质。例如，频分多址、时分多址、码分多址、计算机通信网络和他们的组合变化[3]。其中最流行的方法是载波监听多址和补偿协议。它是由广泛的协议组织标准在无线局域网中的产生的[7]。

一般来说，有两大类MAC协议：争用多址接入协议和以预约为基础的多址接入协议[2]。争用多址接入协议通常用于分布式网络架构（即特设网络）。它不仅具有允许扩展网络的灵活性，它的简单也使它更容易实现。此外，它还具有低时延特性，因此适用于交通突发数据在低网络的负载。预定的多址接入协议通常根据适当的系统用于集中式网络体系结构。他们的有利之处在于,能够支持实时交通。但是,他们缺乏灵活性，不能产生更大的开销管理信息[12]。在本论文中，我们专注于分布式MAC协议。

核心的贡献,本文提出一种新型MAC方案,名叫MTT，它是CSMA / CA基础网络系统。该方案让每个站得到传播一阵数据包的传输机会，而不是成为一个缺陷的生产标......

Abstract. Distributed contention-based Medium Access Control (MAC) protocols are the fundamental components for IEEE 802.11 type Wireless LANs (WLAN). The deficiency of these types of MAC protocols mainly comes from the idle slots used to contend the channel and from the transmission collisions due to the same backoff slot value being generated. Assigning the same transmission opportunity to various length packets also degrades the system performance. This study takes account of the above issues and presents a new MAC scheme called Maximizing Transmission Time (MTT) to enhance the wireless LAN performance. This scheme allows each station to transmit a burst of packets after winning a transmission opportunity instead of just one packet. This idea can reduce the average number of waiting slots and collision probability in each transmission cycle. Moreover, in order to ensure fairness among stations, a maximum transmission period is assigned to each station for controlling the length of the bursty transmission. An analytical performance model is derived for computing the throughput of the MTT scheme. The extensive simulation experiments reveal that the proposed method can enhance the wireless LANs performance significantly with high throughput, low delay and high degree of fairness.

Keywords: WLAN, distributed MAC, maximizing transmission time, throughput, delay, fairness, analytical modeling

1. Introduction

In WLAN, the MAC protocol is the main element that determines the efficiency in sharing the limited communication bandwidth of the wireless channel [7]. Different access methods have been proposed to control the multiple users’ access to the shared medium. Examples are FDMA, TDMA,CDMA, ALOHA and their combinations and variations [3].

One of the most popular approach is the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol. It is adopted by the IEEE standards organization as the underlying protocol for the widely deployed IEEE 802.11 type WLAN[7].

In general, there are two broad categories of multiple access control protocols: contention-based multiple access protocols and reservation-based multiple access protocols [2].

Contention-based multiple access protocols are usually used in distributed network architectures (i.e. ad hoc networks). Its......