Literature Review and Background, voice Capacity Improvement over Infrastructure WLANs, service Differentiation over Ad Hoc WLANs, Collision-Free MAC for Wireless Mesh Backbones,... As the main contents of the document "Distributed Medium Access Control in Wireless Networks". Invite you to consult.
Khu vực này là một trong những được bao phủ bởi một BS. Bất cứ khi nào người dùng di chuyển ra khỏi khu vực, thông tin liên lạc (hoặc phiên) bị gián đoạn. Một ví dụ điển hìnhĐường trục: đài phát thanh liên kết Internet Backbone: có dây liên kết (sợi quang học cũ)
The Digital Building Telecommunications Access Guideline Foreword Scope and Purpose Digital River The Process More information and comments Principle 1: Spatial Access and Design 1.1 Introduction 1.2 Communications Network Architectures 1.3 Telecommunications Service Entrance 1.4 Equipment Room 1.5 Backbone Pathways or Riser Shafts 1.6 Telecommunications closets (TC) 1.7 Horizontal pathways 1.8 Radio (Wireless) Facilities Provision 1.9 Standards & References Principle 2: Diversity 2.1 Building Entry Point (BEP) 2.2 Equipment Room 2.3 Riser Shafts 2.
Topologies and Access Methods
Describe the basic and hybrid LAN physical topologies, and their uses, advantages and disadvantages
Describe the backbone structures that form the foundation for most LANs
Compare the different types of switching used in data transmission
Understand the transmission methods underlying Ethernet, Token Ring, FDDI, and ATM networks
Describe the characteristics of different wireless network technologies, including Bluetooth and the three IEEE 802.11 standards
The data link layer needs to pack bits into frames, so that each frame is distinguishable from another. Our postal system practices a type of framing. The simple act of inserting a letter into an envelope separates one piece of information from another; the envelope serves as the delimiter.
In 1985, the Computer Society of the IEEE started a project, called Project 802, to set standards to enable intercommunication among equipment from a variety of manufacturers. Project 802 is a way of specifying functions of the physical layer and the data link layer of major LAN protocols.
In random access or contention methods, no station is superior to another station and none is assigned the control over another. No station permits, or does not permit, another station to send. At each instance, a station that has data to send uses a procedure defined by the protocol to make a decision on whether or not to send.
Handoff in mobile and wireless networks
Wireless data services use small-coverage high-bandwidth data networks such as IEEE 802.11 whenever they are available and switch to an overlay service such as the General Packet Radio Service (GPRS) network with low bandwidth when the coverage of a Wireless Local Area Network (WLAN) is not available. From the service point of view, Asynchronous Transfer Mode (ATM) combines both the data and multimedia information into the wired networks while scaling well from backbones to the customer premises networks....