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一、4G基本概念 下一代无线通信系统——4G的目标是成为一个无所不在的无线通信系统,提供无缝、高QoS、高速率的无线业务。这必然要求人们在现存的体系、频谱分配及利用上进行创新,对无线传输网络、无线业务和应用进行创新。在这些领域中,在某个领域上的创新必然会导致在另一领域上的创新。4G是一个动态的和自适应的系统,可以提供频率分配和管理、动态及快速的自适应多层路由技术、智能无线电及自适应组网技术。在WWRF的出版物中,提出下一代无线网络体系如图1所示,该网络具有以下一些特点。
First, the basic concept of 4G Next-generation wireless communication system - 4G goal is to become a ubiquitous wireless communication system to provide seamless, high QoS, high-speed wireless services. This will inevitably require people to innovate in the existing system, spectrum allocation and utilization, and innovate in wireless transmission networks, wireless services and applications. In these areas, innovation in one area inevitably leads to innovation in another. 4G is a dynamic and adaptive system that provides frequency allocation and management, dynamic and fast adaptive multi-layer routing, smart radio and adaptive networking technologies. In the WWRF publication, the Next Generation Wireless Network System is proposed as shown in Figure 1, which has the following features.