3G (第 3代 )系统可支持全IP的体系结构 ,以便灵活地部署IP技术 ,同时提供实时和非实时的服务。为了减少切换过程中的分组丢失和时延 ,文中提出了一种新的切换方案 ,它利用了同时多重绑定的概念 ;也提出了一种根据网络状况为呼叫请求分配资源的自适应资源分配方案 ,在这一方案中 ,可以通过减少正在进行的呼叫所占带宽来尽量降低切换呼叫的掉话率和始发呼叫的阻塞率 3G (3rd Generation) systems support an all-IP architecture for flexible deployment of IP technologies while providing both real-time and non-real-time services. In order to reduce packet loss and delay during handover, a new handover scheme is proposed in this paper. It takes advantage of the concept of multiple simultaneous bindings. It also proposes an adaptive resource allocation that allocates resources to call requests based on network conditions Scheme, in this scheme, the call drop rate and the blocking rate of the originating call can be reduced as much as possible by reducing the bandwidth occupied by ongoing calls