Service quality index evaluating method for wireless multi-hop network based on model

Abstract

The invention builds a two-dimension FSMC series queue model and applies the limited retransmission ARQ (Automatic Repeat Request) error recovery technology aiming at the situations that the end-to-end service quality is evaluated precisely under the wireless multi-hop network environment, the QoS (Quality of Service) index of a link circuit is dynamically estimated, the packet loss probability of the link circuit, time delay and routing requirement of available bandwidth are comprehensively considered, so that the computation of the packet loss probability is more precise, the queue state and the service state are combined, not only can the processing time delay be computed precisely, but also the sending time delay can be evaluated precisely, therefore, more accurate QoS index of the wireless network can be obtained. Based on the model, the service quality index evaluating method applies the weighted average QoS measurement to select an optimal path in a bandwidth available link circuit; three performance indexes, namely the end-to-end bandwidth, packet loss probability and the time delay are comprehensively considered; the method can be applied to a dynamic system, can find out a route hop-by-hop as the method is benefited from the excellent distributed characteristics of the model, so that only the expected available path can be utilized in the future, the computation in certain nodes of the network is reduced, and the complexity of finding a route is reduced.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a scenario of accurately estimating end-to-end QoS parameters in a wireless network environment, considering service arrival characteristics, wireless channels, and physical layer and link layer parameters to establish a serial queue model, and develop A routing algorithm based on this model is proposed to ensure the end-to-end QoS requirements of multimedia services in multiple wireless networks. Background technique [0002] Wireless multi-hop networks are gradually becoming an important part of future wireless communication systems, including wireless broadband metropolitan area networks and wireless Mesh networks. In the wired-wireless communication system, the demand for high data rate and QoS is increasing greatly. Compared with wired networks, wireless networks not only have less resources (including bandwidth and power), but also multipath fading, Dopple...

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Problems solved by technology

[0009] However, this method is only suitable for wireless single-hop networks, not for wireless multi-hop networks

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