Researches On QoS Techniques In Oilfield Wireless Heterogeneous Networks

With the development of Internet, the importance of network environment in oil field is increasing day by day. In general,oilfield network environment is made up of 4G?WiMAX?GPRS/CDMA public network and many other networks. And these different networks constitute the wireless heterogeneous network in oilfield. The using of heterogeneous network in oilfield creates many advantages, but it also have many problems,such as mobility management technology? the joint radio resource management?the end-to-end QoS guarantee and the security management.The guarantee of QoS as a crucial element for further heterogeneous networks faces many challenges. It mainly includes lacking of uniform QoS classifications, techniques in general and the global QoS optimization. But the guarantee of QoS is the direct embodiment of network business and it is a realistic problem in oilfield wireless heterogeneous network which need urgent solution. This dissertation researches on the problem of the guarantee of QoS in oilfield Wireless Heterogeneous Networks, mainly about QoS horizontal mapping and QoS routing.Aiming at the problem of horizontally QoS mapping in oilfield Wireless Heterogeneous Networks, we propose a Network load based horizontally QoS mapping mechanism. The horizontally QoS mapping mechanism generates QoS mapping table by combining the practical application in oilfield and the service priority settings of each typical network and QoS models. Different policies of transmission priority adjustment can be chosen according to the variability of the network load when transferring, and by this way we can achieve the dynamic adjustment of mapping relationships among heterogeneous networks. The experimental results show that it can achieve the interworking between different network and the QoS of observed services can be satisfied effectively and the resource utilization of the network is improved significantly.Aiming at the problem of QoS routing in oilfield Wireless Heterogeneous Networks, we propose a routing method which sets meeting the business QoS constraints as the fundamental goal under multi constraint condition. The method calculates the satisfaction degree of QoS constraints on network resources, then we weight and sum the degree and set it as decision condition to select route. Before the calculating,those routes would be selected based on the business requirements to reduce the calculation times. The comprehensive experiment and wide analysis was performed to select the threshold for the satisfaction index. the frequency of updating routing information and other parameters. The experimental results show that the proposed approach can effectively determine an optimal route for a specified task and improve the business efficiency when the parameters are all set correctly.The dissertation research on the guarantee of QoS in oilfield wireless heterogeneous network and propose a dynamic horizontally QoS mapping mechanism which based on network load and a routing method under multi constraint condition. Both methods can achieve our expected goal,and they provide a theoretical reference for solving the QoS problems in oilfield wireless heterogeneous network environment.