中文摘要：

在传统的无线网络环境中,当网络状态发生变化时终端无法自动获得吞吐量、拥塞信息等详细的网路参数,从而难以进行动态的接入链路选择,造成网络性能下降。本文提出一种动态接入链路选择机制DALSS（Dy-namic Access Link Selection Scheme）。DALSS是一种基于网络状况的接入链路选择机制,可以动态评估每条传输路径的容量和可用带宽,实现对路径的动态选择和替换。对于终端用户和网络而言,DALSS优点在于：（1）提供一种初始选择机制,便于终端在多种接入技术覆盖的无线网络环境中建立传输连接;（2）提供一种通信中的动态路径更替机制,使终端能够根据网络状况选择更优的路径,优化传输性能。为评估DALSS的性能,设计一种终端均衡分布的原则,使提高终端吞吐量的同时优化网络的整体性能。实验仿真进一步验证DALSS的有效性和可用性。

英文摘要：

In the traditional wireless network,due to the absence of detailed network parameters,the terminal can not dynamically select the optimal path.This causes the performance of the nework to fall into a decline.In this paper we propose the new Dynamic Access Link Selection Scheme（DALSS） that is based on collecting the real time network data.Link capacity and available bandwidths are required to be estimated to fulfill link selection and alternation.For the terminal user and the network,DALSS has the following two advantages ： 1） It proposes a simple initial access link selection scheme to facilitate transmission establishment for the terminal in the network environment covered by multiple accessing technologies;2） it designs a dynamic link alternation method for the terminal to select the better path during the transmission period,which optimizes the transmission performance of the network.In order to evaluate DALSS,we propose a proportional distribution principle,which achieves the maximum throughput and optimize the overall network performance.The experimental results further verify the effectiveness and applicability of DALSS.