Dynamic channel selections and performance analysis for High-Speed Train WiFi network

The special communication scenario in High-Speed Train (HST) not only leads to an increasing demand of high throughput and continuous multimedia services but also arises many other challenges for cellular network access technology, such as high mobility, frequent and group handovers etc. In order to address above problems, we propose an HST WiFi network application scheme which adopts multi-hop technology and introduces relay nodes to turn the wired backhaul into wireless, in which, we propose a dynamic channel selection scheme to avoid co-channel and adjacent channel interferences. In addition, we also provide the comparison of single AP and double APs deployment solutions to balance the bursting access capability and the interference performance. In consideration of the worst case of the HST WiFi system, we obtain the throughput of the carriage-edge users, and observe that 80MHz channel bandwidth can achieve the best throughput performance under the deployment of single AP, while the throughput of 20MHz channel bandwidth is the highest in the deployment of double APs.