蓝牙核心协议L2CAP的实现

蓝牙无线技术是构建无线个域网的核心技术,其核心协议的开发是当前研发工作的热点之一。该文详细地分析了蓝牙核心协议中逻辑链路控制与适配协议(L2CAP),并描述了基于L2CAP协议文件传输的实现过程。最后对L2CAP协议开发工作进行了总结。     

蓝牙协议一致性测试和蓝牙测试仪

该文介绍了蓝牙协议一致性测试技术,提出蓝牙协议一致性测试的三种典型测试解决方案,并简要介绍了IVT公司推出的第一台蓝牙测试仪。     

蓝牙技术的协议标准

本文简介蓝牙技术的协议标准。     

蓝牙协议及其应用模型

蓝牙技术是目前一项十分先进的无线网络技术，他以低成本、短距离的无线连接为基础，能取代电缆将一定范围的计算机和通信设备连接起来，实现不同设备之间的快速互联。本文主要讨论了蓝牙协议体系及其应用模型，以进一步推动蓝牙技术的广泛应用。     

蓝牙RFCOMM协议分析与实现

RFCOMM协议是蓝牙协议栈的重要组成部分,许多应用框架都要使用到该协议。它在L2CAP协议之上提供了对九针RS-232串口的仿真,通过此协议可以使得传统的基于串口的应用可使用蓝牙技术来传输数据。文中对RFCOMM协议的原理及实现机制进行了详细的阐述,在此基础之上给出了面向对象的软件设计方案。     

蓝牙协议的体系结构及其应用

本文从蓝牙协议栈和蓝牙技术的应用与市场展望两方面着手对蓝牙技术进行介绍和分析。并在文章最后提出了几点亟待解决的问题。     

蓝牙自适应分组选择策略与选择重传算法研究

为了提高蓝牙抗干扰能力与传输效率,从基带层重传和L2CAP层重传研究了蓝牙的重传机制。基带层提出了利用重传次数估计跟踪信道质量的自适应分组选择策略,根据当前信道的重传次数动态选择使其吞吐量最大的分组。在L2CAP层,针对连续重传需要传送已经准确接收的数据帧的缺点,提出了结合连续重传和流控制2种模式的选择重传算法,无需改变蓝牙协议。仿真与分析表明,算法能有效提高吞吐量与传输效率、降低时延,容易实现。     

蓝牙基带协议的探讨

本文主要概述了蓝牙技术规范中的基带层（baseband）协议，对蓝牙基带协议中的主要问题进行了探讨，重点讨论了baseband中信道控制过程和蓝牙单元网络连接的建立。     

L2／L3交换的应用和发展

L2／L3交换的应用和发展在当前电信和网络技术领域非常活跃。根据OSI分层，L2对应数据链路层，L3对应网络层。本主要针对对应第二层的以太网协议和对应第三层的IP协议的交换和路由技术进行论述。     

智能交通系统中的逻辑链路控制协议分析

分析比较了欧洲及日本的逻辑链路控制协议与自适应逻辑链路控制协议，指出对一般的交通业务，两者性能相同，在支持无线互联网业务方面，自适应逻辑链路控制协议性能更优。     

Performance Evaluation of a Logical Link Control Protocol for an ATM Air Interface

The paper deals with error control proceduresbased on repetitions necessary for an ATM air interface,which enables a full integration of wireless (W) ATMterminals into a fixed ATM network. The architecture and functionality of an additional LLC layer atthe air interface are explained. A set of ARQ protocolsfor the different ATM service classes is investigated.The protocol for VBR services is able to control the number of retransmissions depending on therequirements on maximum delay and residual cell lossratio. It also takes into account instantaneousconditions such as channel load from other sources.Furthermore, the protocol is able to discard ATM cells toavoid and resolve congestion. The performance of theprotocol has been evaluated by simulations.     

蓝牙网络上的IP传输

介绍了一种运行于蓝牙网络的IP机制,提出了解决IP分组如何在蓝牙协议上传输的方案,从而实现蓝牙的无线接入。     

Bluetooth协议模型及应用

Bluetooth是一种短距离范围内的无线数据和语音通信的开放性全球规范,目的是取代现有的PC、打印机、传真机和移动电话等设备上的有线接口。较详细介绍了Bluetooth的协议体系和应用模型。     

Automated Verification of the Connection Management Aspects of the IEEE 802.2 Logical Link Control Protocol

This paper discusses the verification of the connection management aspects of the IEEE 802.2 logical link control (LLC) protocol standard for local area networks. An automated protocol development technique is used to verify a subset of the protocol with respect to the protocol properties of completeness, deadlock freeness, boundedness, and termination. These properties are found to hold for the subset of the protocol analyzed here. The technique is also used to derive user event sequences for some interesting subsets of the protocol. These user event sequences together make up a partial service specification of the protocol.     

Performance Analysis of the ATM Adaptation Layer 2 (AAL2)

In this paper, we analyze the performance of AAL2 multiplexer for a continuous time Markovian arrival process. AAL2 CPS (Common Part Sublayer) packets are multiplexed in the AAL2 multiplexing queue and transmitted in the transmission queue. This tandem structure suggests that the statistics of AAL2 CPS requires at least 2 dimensional state space. Furthermore, from a network-level point of view, cell multiplexing and de-multiplexing procedures are repeated at each AAL2 switching node. That requires simple analysis model. To solve this problem, we reduce the state space by showing that the output process of multiplexing queue can be modeled with the Coxian distribution. We propose a single dimension analysis model of the CPS transmission queue. When AAL2 convey both real and non real time short packets, QoS management is a problem. This is because the QoS of real time as well as non-real time packets is measured using different metrics – delay and cell loss ratio respectively. Most previous work is concentrated around delay performance due to the real time applications getting the primary attention. From the direct comparison of delay and CLR performance, we show that delay constraint is the dominant parameter in QoS of AAL2.     

链路管理协议LMP中控制通道管理的研究

介绍了LMP的主要功能：控制通道管理、链路属性关联、链路连通性验证和故障管理，并对LMP控制通道管理做了进一步的分析和研究。     

PS/2接口协议解析及应用

文中详细介绍了PS/2接口协议的内容、电气特性和标准键盘的第二套键盘扫描码集。给出了基于嵌入式系统的PS/2接口的软、硬件实现方法 ,并介绍了工控PC外接双键盘的解决方案。通过使用模拟开关CD4052巧妙地解决了工控PC外接双键盘的冲突问题。     

基于IPSec的L2 VPN研究与设计

L2 VPN工作在OSI网络模型的第二层,它可以隐藏地域限制,并提供虚拟专有网络服务。本论文研究如何基于IPSec隧道实现L2 VPN。