TAILIEUCHUNG - Wireless địa phương vòng - lý thuyết và ứng dụng P11

Recently, many telecommunications operators have been looking for wireless technology to replace parts of the hard-wire infrastructure. The wireless local loop (WLL) technology [1] is considered as the most fitting solution as radio systems can be rapidly developed, easily extended, and are distance insensitive. Since a WLL eliminates the needs (such as wires, poles and ducts) essential for a wired network, it can significantly speed up the installation process. A typical WLL system may consist of hundreds or thousands of base stations (BSs). In such a large-scale system, the mobility of a user may be limited to a small area | Wireless Local Loops Theory arid lipplicadarii Peter Stavroulakis Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-49846-7 Hardback 0-470-84187-7 Electronic 11 PBX based Mobility Manager for WLL Yi-Bing Lin Introduction Recently many telecommunications operators have been looking for wireless technology to replace parts of the hard-wire infrastructure. The wireless local loop WLL technology 1 is considered as the most fitting solution as radio systems can be rapidly developed easily extended and are distance insensitive. Since a WLL eliminates the needs such as wires poles and ducts essential for a wired network it can significantly speed up the installation process. A typical WLL system may consist of hundreds or thousands of base stations BSs . In such a large-scale system the mobility of a user may be limited to a small area. For example if the customer premises equipment CPE is a fixed access unit the user is only allowed to communicate with a specific BS. On the other hand the user may wish to roam in the whole WLL service area. That is one may want to connect the handset to any BS in the system. In such a case the WLL must support mobility management to identify the locations of users. Otherwise thousands of the BSs would be asked to page a handset for call termination which is technically infeasible. In this paper we show how to modify a private branch exchange PBX to accommodate mobility management for a WLL. The features of our approach are listed below 1. The PBX will serve as a WLL switch that connects Public Switched Telephone Network PSTN to the BSs. 2. The BSs are connected to the PBX through standard line or trunk interfaces. We use analogue subscriber lines as an example for PBX-BS connections. 3. The line circuits in the PBX can connect to a wireline telephone or a wireless BS. The PBX automatically distinguishes the BS from the telephone. This feature allows flexible BS layout installation. 4. A handset can communicate with any BS within the .

• Kĩ thuật Viễn thông
• Lý thuyết Wireless
• ứng dụng wireless
• dịch vụ truyền thông
• hạ tầng viễn thông
• vòng lặp không dây
• Bài giảng Lý thuyết mạng máy tính
• Lý thuyết mạng máy tính
• Mạng máy tính
• Wireless và mobile network
• Cellular internet access
• Mạng wireless
• tài liệu MPG
• lý thuyết mạch
• điện tử viễn thông
• tự học viện thông
• lý thuyết viễn thông
• Quản trị mạng máy tính
• Mobile network