基于应用层流量优化的中继路径选择方案

基于网络层路由协议的缺省单一路径难以满足高带宽应用的端到端传输需求，多径传输是一种有效方式。在基于应用层中继的多径传输系统的基础上，提出基于应用层流量优化的中继路径选择方案：借助于应用层流量优化机制，提出中继路径选择过程中遵循的规则，提出基于运营商定义域的最优中继路径生成算法，为数据传输分配优质的中继路径，同时在运营商定义域之间以及中继服务转发器之间保持负载均衡。仿真结果表明，提出的方案在选择优质中继路径方面具有较优性能，同时能够灵活地均衡运营商定义域之间的负载。

A relay path selection scheme based on application layer traffic optimization

The single default IP path determined by the network layer routing protocols can hardly meet the transmission requirements of growing QoS sensitive applications.Multipath transport has been proven to be an effective way to improve the efficiency of data delivery.On the base of the general multipath transport system based on application-level relay (MPTS-AR) proposed in our earlier work,a relay path selection scheme based on application layer traffic optimization (ALTO) is presented.This scheme is facilitated by means of ALTO that is under the standardization within the IETF.Rules to be obeyed during path selection procedure are proposed. An optimal relay path selection algorithm based on provider-defined domains is proposed.The goal of the path selection algorithm is to find the superior relay paths,while trying to balance the overlay traffic among the provider-defined domains and relays.Simulation results demonstrate that the proposed scheme performs well in selecting superior paths and meanwhile provides the flexibility to balance the overlay load among the provider-defined domains.