Research On Service Capability Of Mobile Communication System In Multi-Scenario

With the development of mobile users’needs and wireless communication technologies, mobile communication systems present the characteristics of different scenarios and different services. Specifically, in order to content needs of using different services anytime and anywhere, in the aspect of network hardware facilities, operators have built specified network to improve coverage ranges which coexists with the initial macro cells in different scenarios, such as high-speed railway, satellite communications and dense urban scenarios. In the aspect of network software applications, besides traditional voice and data download services, facilitators develop different services such as online multimedia, instant communication, smart home, social games and online games to content users’needs. The increasing developments of network hardware and software functions lead the research on service capability of mobile communication system in multi-scenario become more and more important.From bottom to top level, this paper summarizes researches as four successive approaches, those are, spectrum management methods, physical layer methods, MAC layer methods and application layer methods. Then based on those methods the performance of mobile communication system bearing different services in multi-scenario are researched as follows:1) The bearing performance of on-line multimedia and voice services in macro cells scenario. In this paper, a QoE (Quality of user Experience) research framework considering equipment and environment factors has been presented. Then, based on this framework, two wireless resource optimization allocation algorithms involving application and MAC layers have been proposed. At last, in view of the limited bearing capacity of3G macro cellular scene, after the two algorithms been applied, the QoE performance of multimedia and voice services have been evaluated.2) The bearing performance of data downloads service in high-speed railway scenario. In this paper, under the circumstances of deployed TD-LTE macro network, the data download performance of passengers has been researched after high-speed railway specified network been deployed. Specifically, first of all, from spectrum management perspective, the downlink throughput of high-speed railway specified network has been evaluated when co-located macro cellular network coexists in co-channel or adjacent channel. Secondly, in view of the serious throughput loss caused by co-located macro cellular network in the downlink of high-speed railway specified network, three anti-interference approaches, those are, the spectrum dynamic avoidance algorithms in MAC layer, the antenna and interference elimination approaches in physical layer have been proposed. At last, the performances of those approaches have been evaluated.3) The bearing performance of smart home service in in-door scenario. When Wi-Fi equipments have been deployed in in-door, the TD-LTE and ZigBee nodes performances of supporting smart home services have been evaluated in this paper. Since the spectrums of LTE, Wi-Fi, ZigBee have been confirmed, the paper proposes smart home scenario model, and the bearing performances to support smart home service in current spectrum partitions have been evaluated. In addition, the paper proposes that MAC layer detection technology will be a good choice when ZigBee nodes are used to support smart home service.4) The bearing performance of instant data service in macro cellular scenario. In this paper, when macro cellular users use QQ and Weibo this two kinds of typical real-time data services, the resource unbalance problems in control channel and service channel have been researched. The paper also proposes modeling scheme of the control channel and evaluates model performance. In addition, researches on the saturation problem of forward control channel earlier than service channel in QQ service have been presented. The advice of adjusting MAC layer sleeping time parameters also has been proposed.5) The voice service performance in satellite and dense urban scenarios. Under the current spectrum allocation, firstly, when satellite communication network is used to expand supporting coverage of mobile communication system, this paper has researched the effect to pre-existing macro cellular network caused by satellite communication network. Secondly, when Micro and Pico base station are used to enhance macro cell capacity, this paper has researched the effect to the voice capacity in macro cell system caused by RF indexes in physical layer of Micro and Pico base stations.In conclusion, in view of system architecture, this paper analyzes the related issues about spectrum allocation, physical, MAC and application layer, discusses corresponding theoretical models and research methods, the optimization or improvement measures are also put forward and carried out. All those give rich research examples and results for service capabilities of mobile communication systems in multi-scenario.