协调功能

无线局域网分布式协调功能动态MAC协议分析

Research of the Dynamic MAC Protocol of Wireless LAN Distributed Coordination Function

在IEEE802.11无线介质访问协议的分布式协调功能基础上，针对adhoc网络，提出了一种改进的实时无线介质访问协议。

Based on distributed coordination function ( DCF ) of IEEE 802.11 , a new real-time wireless media access control ( MAC ) protocol in Ad hoc was proposed .

然后以此为基础，研究支持多优先级服务的分布式协调功能（DCF）协议。

Then the new DCF protocol supporting service differentiation is investigated .

在MAC层，标准定义了分散式协调功能和集中式协调功能作为基本的两种通信方法。

In MAC layer , it employs distributed coordination function ( DCF ) and point coordination function ( PCF ) as two kinds of fundamental access method .

IEEE802.11分布式协调功能（DCF）只支持前向数据传输，即数据帧只能由发送方传送到接收方。

IEEE 802.11 distributed coordination function ( DCF ) only supports transmission in the forward direction from senders to receivers .

以数字扬州的实证分析为例，3S集成技术在沿江开发中的应用具有整合沿江资源、提供决策支持、发挥整体协调功能等意义。

Based on the functional and applicational methods of 3S , the application of 3S in Yangzhou 's development along the Yangtze River is analyzed .

IEEE802.11无线局域网的基本接入方式是分布式协调功能（DCF）。

The basis of IEEE 802.11 wireless LAN Medium Access Control ( MAC ) is Distributed Coordination Function ( DCF ) .

在介绍IEEE802.11常用的网络结构后，采用图文并茂的形式详细描述MAC层的分布协调功能（DCF）和点协调功能（PCF）机制。

After the introduction of common network frame of IEEE 802.11 , detail description of DCF and PCF mechanism was presented and assisted with picture .

该文通过数学模型分析IEEE802.11网络中，终端采用分布式协调功能（DCF）方式发送一个数据包消耗的平均能量。

In IEEE 802.11 WLAN , the average energy consumption in transmission per frame through DCF mechanism is analyzed by mathematical model .

分析了MAC层的总体功能结构，介绍了其中的分布协调功能（DCF）和点协调功能（PCF）功能。

After the whole functional architecture is introduced , we study the distributed coordination function ( DCF ) and the point coordination function ( PCF ) .

IEEE802.11e协议草案以增强型分布式协调功能（EDCF）为基础，用于加强对无线局域网标准IEEE802.11的QoS支持力度。

The IEEE 802.11e draft based on enhanced distributed coordination function ( EDCF ) can enhance the QoS of IEEE 802.11 wireless LAN .

这样做的目的在于更好地发挥ARM芯片的系统协调功能，同时可以利用CPLD编程灵活的特点实现触发脉冲电路，减轻ARM芯片的计算负担。

This structure can give better play to ARM chip system coordination functions , and can use the characteristics of CPLD programming flexibility to achieve pulse generator to reduce the computational burden of ARM chip .

结果，低、中、高三个剂量组与对照组相比，对小鼠自主活动和协调功能均未见明显影响（P0.05）。

The results were that the low , medium and high doses of potassium citrate and sodium citrate chewable tablets had no significant effects on locomotor activity and coordination action to mice ( P > 0.05 ) .

IEEE802.11e无线网络协议标准中增强分布式协调功能（EDCF）性能分析

Analysis on the performance of the enhanced distributed coordination function ( EDCF ) in IEEE 802.11e

在第四章，我们给出了IEEE802.11分布协调功能（DCF）在饱和条件下的闭队列模型，并给出了平均延时的计算公式。

In the fourth chapter , we give a closed queuing model for IEEE 802.11 DCF under the saturated condition , and gives the formula for calculating the average delay .

系统的开发是以现场可编程门阵列（FPGA）为核心，实现信号采集和处理的协调功能。给出了设计思路和硬件部分的原理图。

Besides , in order to achieve the coordinate function of signal collocation and its treatment , the system takes the FPGA ( field programmable gate array ) as core , and provides the thought of design as well as the elementary diagram of hardware .

对IEEE802.11MAC层两种主要的信道分配机制&分布式协调功能（DCF）和点协调功能（PCF）进行了性能的分析和比较。

Aimed at two primary channel allocation mechanisms of MAC layer in IEEE 802.11 WLAN , Distributed Coordination Function ( DCF ) and Point Coordination Function ( PCF ), a performance analysis and comparisons have been done .

目前无线局域网产品普遍采用传统的IEEE802.11标准，其MAC（媒质接入控制）层的协调功能DCF（分布式协调功能）和PCF（点协调功能）却不能提供QoS支持。

IEEE 802.11 , which is the main standard for WLAN products , can not provide QoS support by its MAC ( Media Access Control ) coordination function – DCF ( Distributed Coordination Function ) and PCF ( Point Coordination Function ) .

论文提出了一种在IEEE802.11无线网络中为实时业务提供服务质量保证的有效方法，即通过修改介质访问控制（MAC）层的分布式协调功能（DCF），为实时数据预留信道。

In this paper , we propose an efficient method to provide QoS for real-time traffic in IEEE 802.11 wireless LANs . Our method is to reserve channel for real-time data through modifying the DCF ( Distributed CoordinationFunction ) at MAC layer .

论述了HIMS的双重管理体制、拟人管理模型、集散管理模式、多级协调功能的设计方法和实现技术。

We discussed the design method and realization technology for the dual management scheme ( DMS ), humanoid intelligent management model ( HIMM ), central-decentralized management pattern and multi-grade coordination function .

文章简要介绍了802.11中的分布式协调功能（DCF）和点协调功能（PCF），重点阐述了802.11eEDCF的基本原理和组成结构。

In this paper , we briefly introduce the distributed coordination function ( DCF ) and point coordination function ( PCF ) of 802 . 11 standard , and describe in more detail the basic principle and structure of 802.11e EDCF .

位于区域调度中心的区域控制系统（ACS）可由系统原有的SCADA，EMS或调度自动化系统获取实时数据，因此只需增加少量的硬件投资便可实现ACS对LCSs的协调功能。

LCSs are under the instruction of area control system ( ACS ) from area dispatching center . ACS is based on real-time data acquisition and communication network of the existing EMS , SCADA or dispatching automation system . ACS can coordinate LCSs with litle additional hardware investment .

以晨光化工研究所为例，介绍如何应用EPM使化工研究的工作流程标准化，推动CMM的实施，提高团队运作效率，增强信息共享和协调功能，最终提高化工企业的研发能力和研发效益。

Chenguang Chemical Research Institute is illustrated to explain how to use EMP to standardize working flow of chemical research , promote implementation of CMM , improve efficiency of team cooperation and enhance sharing and harmonious function of information , resulting in increased RD capacity and benefits of chemical enterprises .

在这个新的协议中，它引入了混合协调功能（HCF），根据竞争介质的方式不同，混合协调功能包含了增强的分布式协调控制接入机制（EDCA）和混合协调点控制接入机制（HCCA）。

It introduces a new coordination function , called Hybrid Coordination Function ( HCF ) . HCF contains two access mechanisms : the Enhanced Distributed Channel Access ( EDCA ) and Hybrid Coordination Function Controlled Channel Access ( HCCA ) .

室内环境协调功能建材的发展

Development of Buildings ' Decorating Materials of the Indoor Environment Harmony

民间组织的利益协调功能及其实践机制

The Benefit Coordination Function of Non-governmental Organizations and The Practice Mechanism

协调功能，包括利益的均衡与冲突的仲裁；

Coordination functions , including equalizing benefit and arbitrating conflicts ;

科技创新可持续化对可持续发展系统具有促进功能和协调功能；

It has promoting and coordinative functions in the sustainable development system .

社会流动机制时社会和谐具有重要的协调功能。

The mechanism of social movement has important coordination function to social harmony .

IEEE802.11e增强型分布式协调功能的性能分析

Performance analysis of IEEE 802.11e enhanced distributed coordination function