Being more precisely, it is not so easy to create an efficient implementation. And geo-fences could be connected also with another hot LBS area – indoor positioning. From the practical point of view both systems mostly interested due to high commercial promising – deliver commercial offering here and right now. II. I MPLEMENTATIONS Now let us see what we have from the practical point of view. Conceptually, geo-fences approach is quite transparent. The principles and model are simple. We have to have some definitions for the areas, e.g. as two pairs of geo-coordinates (latitude, longitude) values. They are defining some square (Nord West – South East). For this square (squares) we can define some notification message (messages). So, as soon as our mobile user (subscriber or user enabled our service is in (or out, or in/out – depends on the rules) he will get that message. As we can see, the basic problems here are how to check user’s location against some predefined geo boundaries and where this checking should be performed. The location of the user can be easily derived by various positioning technologies like GPS or Cell. We can determine the location of a user while he is active in a service session, or we can organize some form of continous monitoring. For latter form the user needs to be continuously tracked in the background, even when the mobile device is idle or executes other applications . One method for positioning is often not enough. So, in the most cases mobile phones can use some combinations, e.g. Assited GPS (A-GPS). A-GPS uses assistance data received from the network to obtain a faster location calculation compared with GPS alone. The positioning data can be exchanged between the phone and the network over either the control channel (control plane) or the user channel (user plane) plane. A control plane implementation uses a dedicated control channel. This approach could be used used for emergency services (e.g., 911 in the US). For non-critical location-based application user plane could be used. The main difference is the the significant network overhead in case of the dedicated control channel . It is so called Secure User Plane (SUPL). With SUPL positioning data is sent over the user’s traffic channel using a secure IP connection between the smartphone (in standard is is called SET - SUPL enabled Terminal) and SUPL Location GeoFence services Dmitry Namiot
Platform (SPL) on the network side. It was developed by the Open Mobile Alliance (OMA) . The objective of the SUPL enabler is to provide an industry standard framework for positioning over the User Plane as an alternative to existing control plane solutions, which are bandwidth- constrained and limited to access types that are part of the control plane system. User Plane may comprise IP and SMS bearers in the mobile networks environment and IP bearers in the WLAN/Internet environment. This mechanism could be implemented in a wide range of contexts (i.e. a controlled mobile network operator’s environment or an open Internet/WLAN environment).
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- Fall '14
- Location-based service, Cell ID, cell id info, SUPL