By Mooi Choo Chuah, Qinqing Zhang
Presentation of historical past fabric of instant communications, site visitors modeling and site visitors engineering options. presents descriptions of upcoming good points resembling IP multimedia subsystems, multimedia broadcast/multicast companies and Push-to-Talk over mobile (PoC) for 3G networks together with difficulties on the finish of every bankruptcy Written for academics, graduate scholars and method designers
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Extra info for Design and Performance of 3G Wireless Networks and Wireless LANs
Third-generation wireless networks are supposed to have enhanced voice capacity and are capable of supporting more sophisticated data applications with their rich Quality of Service features. However, since the airlink technology used for the European third-generation systems is completely different from the second-generation and the systems become more complex, the standardization effort has been delayed. 11based wireless LAN system  has become a mature technology, and hotspot services have begun to flourish in the United States.
All service providers are interested in maximizing their revenue via offerings of high-value services while maintaining high utilization of their installed infrastructure. QoS engineering is an end-to-end issue. It must take into account the user terminal, the air interface, the radio access network, the core network, and external networks. QoS engineering involves all layers, namely physical, MAC, radio link, ATM-based or IP-based backhaul network, backbone network, and application layers. The following are common techniques used for QoS engineering: • Traffic characterization Before any QoS engineering work can be performed, the traffic engineer needs to understand the different applications that will be used by the subscribers, the traffic arrival patterns of such applications, and the packet sizes/volume generated/received by such applications during a typical active session.
Users experience different fading conditions from time to time. Power control algorithms are used to ensure that the users can enjoy consistent airlink performance (in terms of packet error rates). Sometimes, the users' allocated rates are adjusted based on the fading conditions. • RF resource setup and teardown strategies Airlink resources are limited. Thus, it is normal practice to release precious airlink resources during the idle times of packet data sessions where users pause to digest the information they obtain before their next action.
Design and Performance of 3G Wireless Networks and Wireless LANs by Mooi Choo Chuah, Qinqing Zhang