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Tham khảo tài liệu 'cellular networks positioning performance analysis reliability part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Middleware for Positioning in Cellular Networks 79 distributes the middleware among an LBS provider a location provider a content provider and the target device. The LBS provider makes the LBS accessible to the external clients i.e. users and communicates with content providers to add value to the target s position which is supplied by the location provider. The target device is responsible for gathering the measurements necessary to compute the position and depending on the technique fixing the position. Fig. 3. Intermediary device-centric middleware architecture The TraX platform consists of three layers positioning e.g. A-GPS WLAN RFID OTDOA etc. position management e.g. polling periodic position updating context awareness etc. and application layers e.g. emergency services navigation LBS goods tracking . . In TraX the most suitable location technique is selected and then activated to perform the Location Service LCS request. The solution proposed in this document is a middleware for system optimization. It is designed to fulfill the requirements of LBS and at the same time optimize the positioning procedure so that the performance of the whole location solution is improved. Further details of the architecture and performance assessment of this middleware location platform are provided in the following sections. 2. Middleware for location cost optimization 2.1 Middleware architecture The resources consumed by location systems generally belong to the underlying networks on which the location solution runs. It means that LBS share the resources with the regular services provided by the network. Thus allocating resources for LBS involves reducing the carried traffic for these regular services. The solution proposed in this chapter is a middleware that addresses optimizing the use of resources in location systems. This middleware which is named MILCO i.e. Middleware for Location Cost Optimization has been developed in the frame of Ministerio de Ciencia y Educacion .
