Deployment scheme of wireless multi-hop network buffer queue

Abstract

The present invention discloses a deployment scheme of a wireless multi-hop network buffer queue. The deployment scheme is applied to a train car WiFi system, a train central deployment gateway node and train and ground communication equipment are used for the communication with a ground base station BS, each car is provided with one AP for bearing the access needs of multiple users in the car, the cars are wirelessly connected by using a wireless relay, and the AP in the car and a car relay are connected in a wired way. By the setting problem of the buffer queue length of each hop of data transmission in a wireless multiple-hop network, under the premise that a system satisfies a maximum end to end delay, the system packet loss rate is reduced as much as possible, and thus the balance between the system resource configuration and system acceptable end to end QoE is achieved.

Description

technical field [0001] The present invention relates to the field of wireless communication. For a wireless network, especially a wireless local area network (WLAN), when data needs multi-hop transmission, the buffer queue size of each hop node in the network is reasonably designed to achieve system resource configuration and system acceptable end-to-end End QoE balance. Background technique [0002] With the advent of the mobile Internet era, the Internet has become an integral part of people's lives. At the same time, WiFi technology has been widely used due to its characteristics of easy deployment and high data transmission rate. In order to better meet people's Internet needs, this technology has been introduced in many public transportation vehicles. In addition, high-speed railway is the main long-distance and short-distance transportation mode in my country, which makes the WiFi system of high-speed trains receive extensive attention. [0003] The deployment of th...

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Problems solved by technology

[0013] The design of the buffer queue in the above-mentioned prior art (2) is realized by adjusting the proportional relationship between the sending rate and the receiving rate, which is only analyzed for a single node, and does not reflect the service acceptance characteristics in the multi-hop serial network; and the method The service arrival process of the medium queuing model adopts the Poisson model, which cannot reflect the suddenness and correlation of multimedia services, so it is not suitable for the train compartment WiFi system

[0014] In the above prior art (3), as the number of nodes in the multi-hop network increases, the dimension of the state probability matrix in the direct method will increase exponentially, so the computational complexity is relatively high

In the decomposition method, although the channel state is considered as one of the basis for judging the state transition in the physical layer Adaptive Coding and Modulation (AMC) technology, it does not reflect the impact of the HARQ mechanism on the establishment of the multi-hop queuing model

[0015] The wireless part described in the above prior art (4) is a single-hop network, and due to the limitation of the algorithm, the process of data transmission from the wireless network to the wired network is not analyzed, that is, the technology does not involve the multi-hop wireless network. Analysis of the leaving process in the network

At the same time, in the analysis of the departure process of the multi-hop wired network, the impact of the HARQ mechanism on the queuing model is not reflected

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