Building Location-Based Services
The Secure User Plane Location Architecture
Although early attempts at location-based applications for the consumer did not live up to market expectations, the momentum is clearly building. The technology has evolved and the standards bodies have produced specifications that enable both user plane and control plane architectures. While control plane architectures have well served the emergency services market, the user plane architecture holds the promise of delivering the most compelling consumer applications. The OMA Secure User Plane Location (SUPL 1.0) specification makes full A-GPS functionality available with minimum core and radio network changes.
The OMA SUPL architecture is designed to enable both mobile assisted and mobile based A-GPS. It is based on existing standards where possible and can be used by other positioning technologies, such as Cell-ID, E-OTD/OTDOA and AFLT. The SUPL Location Platform (SLP) consists of an SUPL Location Center (SLC) and SUPL Positioning Center (SPC). The SLC and SPC may be integrated into a single system. The SLC system coordinates the operations of SUPL in the network, manages the SPC’s, and provides secure authenticated location information to third party application servers. The SUPL Positioning Center (SPC) provides GPS Assistance data to the SUPL Enabled Terminal (SET) and performs the function of calculating the position of a SET. The SET supports SET-based and/or SET-assisted positioning calculation. The LBS applications may reside and be executed in the SET or in the network.
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