Another way of responding these queries could ease the BRIEF DESCRIPTION OF DRAWINGS capacity problem. However, the inventors have found that
the present network arrangements are not capable of pro- For better understanding of the present invention, refer
viding the information that is required e.g. by the presence ence will now be made by way of example to the accom
service in such a way that it could readily accessed by an 5 panying drawings in which:
entity requiring the information. The prior art proposes no piG. 1 shows a communication network architecture
feasible solution for the storage and dynamic update of the including a server entity in accordance with an embodiment
status information and for the provision of this information 0f me present invention;
for clients. FIGS. 2 and 3 illustrate signalling between various enti
10 ties of a communication system in accordance with a first
SUMMARY OF THE INVENTION ancl a second embodiment of the present invention; and
FIG. 4 is a flowchart illustrating the operation of one
Embodiments of the present invention aim to address one embodiment of the present invention, or several of the above problems.
According to one aspect of the present invention, there is 15 DESCRIPTION OF PREFERRED provided a communication system comprising: communica- EMBODIMENTS OF THE INVENTION tion means for providing communication media for a plurality of user equipment; a storage entity adapted to store Reference is made to FIG. 1 which shows a possible information that associates with at least one of said user network system architecture including a server entity 21 in equipment, wherein the storage entity is arranged to receive 20 accordance with an embodiment of the present invention, information from other entities and to associate said The exemplifying network system 10 is arranged in accorreceived information with a respective user equipment; and dance with UMTS 3G specifications. The cellular commuat least one service provision entity adapted to serve a client nication system 10 is arranged such that the apparatus based on information stored in said storage entity. ^ thereof is divided between a radio access network (RAN) 2
According to another aspect of the present invention there and a core network (CN). is provided a server means for a communication system, said In general terms, a communication system can be server means comprising: interface means for receiving described by a model in which the functions of the system information associated with user equipment adapted for are divided in several hierarchically arranged function laycommunication via the communication system from at least 3Q ers. FIG. 1 shows three different function layers, i.e. a one element of the communication system; means for service layer, an application layer and a transport layer. The dynamically associating the received information with cor- solid lines indicate actual data communication between responding user equipment; means for storing the informa- various entities and networks. The dashed lines indicate tion such that the information can be retrieved based on signalling traffic between the network entities. The signalindication of a particular user equipment; and interface 35 ling is required for management and/or control functions of means for connection between the server means and at least the network, such as for call session set-up, charging and so one service entity, whereby the service entity serves clients on.
based on information from the server means. It shall be appreciated that the layered model is shown According to another aspect of the present invention there only in order to illustrate the relationships between the is provided a method in a communication system, said 40 various functions of a data communication system. In a communication system providing communication media for physical i.e. real implementation the entities (e.g. servers or a plurality of user equipment, the method comprising the other nodes) are typically not arranged in a layered manner, steps of: generating information associated with a user A plurality of user equipment 1 is served by a 3G radio equipment in an entity of the communication system; com- access network (RAN) 2 over a wireless interface. Hence the municating said information to a storage entity; at the 45 user equipment will be referred to in the following by the storage entity, receiving and associating said information term mobile station. The radio access network function is with the user equipment; and providing information that hierarchically located on the transport layer. It shall be associates with the user equipment to a service provision appreciated that although FIG. 1 shows only one radio entity, whereby the service provision entity is enabled to access network for clarity reasons, a typical communication serve clients based on said information from said storage 50 network system comprises a number or radio access netentity, works.
The embodiments of the invention may provide an The 3G radio access network (RAN) 2 is shown to be
arrangement wherein the clients may readily be provided physically connected to a serving general packet radio
with information that associates e.g. with the status of a service support node (SGSN) entity 3. The SGSN 3 is a part
subscriber, communication session and/or an entity of the 55 of the core network. In the functional model the entity 3
system. The provision of the information may be centralised belongs to the transport layer. The operation of a typical
in one entity that is functionally separated from those cellular network and the various transport level entities
network entities that are required for the provision of thereof is known by the skilled person and will thus not be
communications in the system. The embodiments may also explained in more detail herein.
enable secure connections between the information provi- 60 An application layer 20 is shown to be located on top of
sion service and the clients. The embodiments may also the transport layer. The application layer 20 may include
enable arrangement where there is no need to give an access several application level functions. FIG. 1 shows two call
for yd parties to specific services and/or registries such as state control entities (CSCFs) 22 and 23. From these the call
the home subscriber server or a location service. Thus the state server 22 is a so called serving call state control
overall security may be improved. The embodiments may 65 function (S-CSCF). That is, the server 22 is currently serving
enable e.g. network operators to provide a set of better and at least one of the mobile stations 1 and is in control of the
richer services. status or said at least one mobile station.