Adaptive QoS Scheme Overview
To implement an adaptive multipath routing scheme, three functions distributed in different parts of the network are needed. First, a modified dynamic source routing function is needed. It handles route discovery and collecting the local QoS-related information along the selected routes. Second, there is a local statistical computation and link monitoring function located in each node. This function is used to support the above routing function. It will manage and build the local routing information in each node, which includes a QoS-related table. The third function will be in charge of the final decision-making process. The adaptive routing parameters are derived from the decision-making algorithm based on the QoS constraints. They are the number N of selected paths, parity length k of the FEC, code and the set {R} of the traffic distribution rates on each path. With these functions, adaptive multipath QoS routing is implemented.
QoS requirements can be based on either a delay or a delay and bandwidth requirement, or a packet loss requirement. FEC parity length is derived from the difference between the QoS delay requirement and the average delay on selected paths under the packet-loss constraint. Average packet loss under this FEC scheme is achieved by using multiple routing paths. At the same time, the packet distribution rate on each path is determined under fair packet-loss and load-balance principles. Routing maintenance under the same QoS guarantees is achieved without increasing its computational complexity.
Read more about this topic: Adaptive Quality Of Service Multi-hop Routing
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