Research and Analysis of CAC Schemes Based on Multi-level GSM-R Services

This paper focuses on safety, reliability requirements and the needs of multi-service in railway communication and carries out researches combined with theory illustration and simulation analysis. Available resources of railway are scarce currently, while services facing to the railway communication are various, such as the radio dispatch services, train control services, as a result, the resources of system are severely limited. At the same time, there are many different services and service-level requirements, such as train control services with high reliability requirements, train radio dispatch services demanding real-time feature, the data services in general level. Therefore, it is essential to take appropriate resource allocation strategies. A dynamic adaptive resource call admission strategy is presented in this paper. Network performance is also compared through simulations under a variety of call admission strategies. In conclusion, wireless network resources are fully and effectively used in condition of ensuring the QoS (Quality of Service).