tailieunhanh - Wireless địa phương vòng - lý thuyết và ứng dụng P12

Wireless Local Loop (WLL) is projected to experience phenomenal growth over the next years. The nature of WLL is such that terminals are not mobile and once installed the subscriber expects trouble-free operation without any service requirements. Meanwhile, new functionality involving enhanced codecs and modems are being developed and expected to be made available to the subscriber. A major challenge facing WLL operators consists of upgrading WLL terminals that are already deployed at the customer site with new functionality [1,3]. Another challenge is the ability to monitor terminal service parameters and events without obtaining physical access to the device. . | Wireless Local Loops Theory and Applications Peter Stavroulakis Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-49846-7 Hardback 0-470-84187-7 Electronic 12 Remote Management and Upgrade in a Wireless Local Loop System Thomas Jagodits and Hans Bhatia Introduction Wireless Local Loop WLL is projected to experience phenomenal growth over the next years. The nature of WLL is such that terminals are not mobile and once installed the subscriber expects trouble-free operation without any service requirements. Meanwhile new functionality involving enhanced codecs and modems are being developed and expected to be made available to the subscriber. A major challenge facing WLL operators consists of upgrading WLL terminals that are already deployed at the customer site with new functionality 1 3 . Another challenge is the ability to monitor terminal service parameters and events without obtaining physical access to the device. The main factor that enables scalable propagation of software images and tracking events at WLL terminals is the dissemination of FLASH-based devices. The cost of FLASH memory has been decreasing becoming the memory device of choice in many wireless devices. This chapter presents mechanisms that enable propagation of software images to wireless terminals and remote capture of events on the same terminals. Both mechanisms have been implemented in a Wireless Local Loop system. The remote upgrade mechanism was used to successfully propagate dozens of software releases in multiple markets. The monitoring mechanism is being used daily to remotely monitor the operational status of thousands of WLL terminals. Section provides a general overview of the WLL application Section details the remote upgrade mechanism including implementation at the wireless device in this case a Subscriber Unit. Section describes the event logging mechanism used for remote management and the last section concludes this chapter. 261 262 Remote Management and .