资料介绍
We focus our paper on wireless local area networks such
as IEEE 802.11 that have become popular as access networks
to the wireless mobile Internet. They can be deployed in hot
spots areas and offer performance comparable to wired local
area networks. The question of the performance effectively
perceived by mobile hosts becomes increasingly important
as many new emerging applications such as mobile information
access, real-time multimedia communications, networked
games, immersion worlds, cooperative work require sufficient
bandwidth.
Although IEEE 802.11b provides a means for allocating a
part of the radio channel bandwidth to some hosts (PCF -
Point Coordination Function), the commonly available access
method (DCF - Distributed Coordination Function) uses the
CSMA/CA protocol to share the radio channel in a fair way.
However, we have observed that in some common situations
in a wireless environment, the method results in a considerable
performance degradation. In a typical wireless local area
network, some hosts may be far away from their access point
so that the quality of their radio transmissions is low. In this
case current 802.11b products degrade the bit rate from the
nominal 11 Mb/s rate to 5.5, 2, or 1 Mb/s – when a host
detects repeated unsuccessful frame transmissions, it decreases
its bit rate. If there is at least one host with a lower rate, a
802.11 cell presents a performance anomaly: the throughput
of all hosts transmitting at the higher rate is degraded belowthe level of the lower rate. Such a behavior penalizes fast hosts
and privileges the slow one. The reason for this anomaly is
the basic CSMA/CA channel access method which guarantees
that the long term channel access probability is equal for all
hosts. When one host captures the channel for a long time
because its bit rate is low, it penalizes other hosts that use the
higher rate.
as IEEE 802.11 that have become popular as access networks
to the wireless mobile Internet. They can be deployed in hot
spots areas and offer performance comparable to wired local
area networks. The question of the performance effectively
perceived by mobile hosts becomes increasingly important
as many new emerging applications such as mobile information
access, real-time multimedia communications, networked
games, immersion worlds, cooperative work require sufficient
bandwidth.
Although IEEE 802.11b provides a means for allocating a
part of the radio channel bandwidth to some hosts (PCF -
Point Coordination Function), the commonly available access
method (DCF - Distributed Coordination Function) uses the
CSMA/CA protocol to share the radio channel in a fair way.
However, we have observed that in some common situations
in a wireless environment, the method results in a considerable
performance degradation. In a typical wireless local area
network, some hosts may be far away from their access point
so that the quality of their radio transmissions is low. In this
case current 802.11b products degrade the bit rate from the
nominal 11 Mb/s rate to 5.5, 2, or 1 Mb/s – when a host
detects repeated unsuccessful frame transmissions, it decreases
its bit rate. If there is at least one host with a lower rate, a
802.11 cell presents a performance anomaly: the throughput
of all hosts transmitting at the higher rate is degraded belowthe level of the lower rate. Such a behavior penalizes fast hosts
and privileges the slow one. The reason for this anomaly is
the basic CSMA/CA channel access method which guarantees
that the long term channel access probability is equal for all
hosts. When one host captures the channel for a long time
because its bit rate is low, it penalizes other hosts that use the
higher rate.
下载该资料的人也在下载
下载该资料的人还在阅读
更多 >
- 无线相关技术术语浅释 7次下载
- IEEE802.11 USB接口双频WIFI模块产品下载 14次下载
- 基于RN1810下的2.4 GHz IEEE 802.11b/g/n无线模块 2次下载
- 基于SST38VF6401/2/3/4下的标准 802.11bRF 收发器模块 14次下载
- 802.11b安全防御手段 18次下载
- Wireless LAN Security(802.11b 17次下载
- 802.11b/g MiniPCI– Express car 19次下载
- 802.11b/g Super G MiniPCI– Exp 5次下载
- EP2410 Series Indoor 802.11b a 9次下载
- IEEE Std 802.11 80次下载
- IEEE 802.11s标准 79次下载
- IEEE 802.11g标准下载 234次下载
- IEEE 802.11e标准下载 23次下载
- IEEE 802.11i标准 1次下载
- IEEE 802.11标准 40次下载
- IEEE 802.11ad标准的发展历程和使用频率 607次阅读
- 基于TNETll00B无线网卡模块实现802.11B无线数据收发的设计 2080次阅读
- 基于IEEE802.11无线局域网标准的嵌入式WiFi技术及应用 4726次阅读
- 关于无线局域网搭建的12个问题 3201次阅读
- 分析IEEE 802.11p和IEEE 1609.4协议中的多信道MAC协议 9496次阅读
- 解析IEEE 802.11g的帧类型检测 4392次阅读
- wifi无线网卡多少钱 2933次阅读
- 浅谈802.11n协议 2924次阅读
- 802.11b无线网络信号的无线MAC开发平台设计 1474次阅读
- 无线标准802.11b的特点和运用分析 3723次阅读
- 基于无线局域网标准的接收机射频前端设计 1476次阅读
- 罗德与施瓦茨首发IEEE 802.11ac信令测试仪 1487次阅读
- 【科普】Wi-Fi相关的IEEE 802.x不同标准特性详解 1775次阅读
- 几种Wi-Fi技术标准与应用对比 7981次阅读
- Wi-Fi 技术简介,IEEE802.11b技术简介 805次阅读
下载排行
本周
- 1东芝BiCD集成电路硅单片TB67S109AFNAG数据手册
- 1.93 MB | 5次下载 | 免费
- 2SP3060A/30120A/30160A/30320A/30520A系列数字合成扫频仪使用说明书
- 4.16 MB | 3次下载 | 1 积分
- 3具有双通道 DC-DC转换器、由串行接口控制的9通道电机驱动器TPIC2010数据表
- 1.15MB | 2次下载 | 免费
- 4USB Type-C PD快充协议智能触发芯片FS312B数据手册
- 0.75 MB | 1次下载 | 免费
- 5USB Type_C PD快充协议智能触发芯片FS8025B数据手册
- 1.29 MB | 1次下载 | 免费
- 6触摸按键PCB 设计要点V01
- 1.42 MB | 1次下载 | 免费
- 7DC-DC电路(Buck)的设计与仿真
- 0.60 MB | 1次下载 | 2 积分
- 85V升压充电两串锂电池充电管理IC FS4058数据手册
- 2.98 MB | 次下载 | 免费
本月
- 1DCDC原理详解
- 0.98 MB | 65次下载 | 免费
- 2allegro快速入门教程
- 1.98 MB | 36次下载 | 免费
- 3FU-7(807)胆机原理图
- 11.93 MB | 25次下载 | 1 积分
- 4用于汽车应用的高压电源管理IC TPS65311-Q1数据表
- 1.05MB | 22次下载 | 免费
- 5电子元件基础知识介绍
- 8.76 MB | 15次下载 | 2 积分
- 6华为海思Ascend 310芯片的资料说明
- 0.12 MB | 10次下载 | 10 积分
- 7GD32F10x系列MCU用户手册
- 11.5MB | 9次下载 | 免费
- 86A 输出电流同步降压稳压器TPS65286数据表
- 2.05MB | 6次下载 | 免费
总榜
- 1matlab软件下载入口
- 未知 | 935083次下载 | 免费
- 2开源硬件-PMP21529.1-4 开关降压/升压双向直流/直流转换器 PCB layout 设计
- 1.48MB | 420045次下载 | 免费
- 3Altium DXP2002下载入口
- 未知 | 233067次下载 | 免费
- 4电路仿真软件multisim 10.0免费下载
- 340992 | 191308次下载 | 免费
- 5十天学会AVR单片机与C语言视频教程 下载
- 158M | 183308次下载 | 免费
- 6labview8.5下载
- 未知 | 81567次下载 | 免费
- 7Keil工具MDK-Arm免费下载
- 0.02 MB | 73785次下载 | 免费
- 8NI LabVIEW中实现3D视觉的工具和技术
- 未知 | 70088次下载 | 免费
评论
查看更多