Explain in detail the Next Generation Networks NGN Draw its

Explain in detail the Next Generation Networks (NGN). Draw its architecture.

NOTE: Subject is Data Communication and Networks

Solution

NGNQoS can be described from five function layers: (1) Application layer that contains the typical middleware for authorization, accounting, directory, search and navigation for millions of users; (2) Network control layer aims at overcoming the bottleneck problems at edge nodes or servers and it is composed of a series of control Fig. 1. NGN Network Architectures 1058 W. Jia et al. agents for admission control, call setup and end-to-end QoS control through available bandwidth detection, local information control, class priority and intelligent scheduling. Multicast and anycast group managements will be implemented to leverage the load for admission control or service/message distributions; (3) Adaptation layer that supports different network configurations and network mobility. This layer can provide soft switching between different networks on different levels such as IPv4, IPv6, ATM, Ethernet, WLAN, WMAN and 3G networks. It supports both packet and circuit switching and provides interconnection between the two switching networks; (4) Network Transmission Layer that provides the effective endto-end QoS control for real-time requests and flows through integration of parameterized QoS control and class priority control. This is particularly important to resolve the bottleneck problems such as multi-path routing that enables the multiple choices for the path and anycast routing that enables the selection from different (replicated) servers and (5) Management layer that provides Web-based GUI browser and wireless connection information such as the data access using XML and Webbased visualization for data presentation, monitoring, modification and decision making in NGN. The IP telecommunication network architecture and software layer architecture are shown in Fig. 1 (see http://www.huawei.com) in which Bearer Control Layer and Logical Bearer Network perform network control together.

End-to-end QoS control, Available bandwidth detection for resource allocations based on local information Adaptation: supports different network configurations and mobility: supports soft switching for packet and circuit switching between IPv4, IPv6, ATM, Ethernet, WLAN, WMAN and Physical Layer Management: Web-based client-server GUI or wireless information browser, accessing, updating, Visualization and presentation A