Location services in a packet radio network

1. An arrangement for supporting location service information related to a mobile station in a mobile communications system supporting circuit-switched communications and packet-switched communications, the arrangement comprising:

means for receiving a request from a requesting entity;

means for retrieving the location service information related to the mobile station; and

means for providing a response to the request;

means for determining a preferred type of connection for said retrieving on the basis of a first set of predetermined criteria;

means for performing at least a first attempt to retrieve the location service information via the preferred type of connection; and

means for determining the first set of predetermined criteria by checking whether the mobile station currently has an active connection via at least one type of connection.

2. The arrangement of claim 1 , wherein the checking is based on examining the request.

3. An arrangement for supporting location service information related to a mobile station in a mobile communications system supporting circuit-switched communications and packet-switched communications, the arrangement comprising:

means for receiving a request from a requesting entity;

means for retrieving the location service information related to the mobile station; and

means for providing a response to the request;

means for determining a preferred type of connection for said retrieving on the basis of a first set of predetermined criteria;

means for performing at least a first attempt to retrieve the location service information via the preferred type of connection; and

means for determining, if the first attempt results in a failure, a second set of predetermined criteria based on a reason for the failure, and

means for performing a second attempt via remaining types of connection in response to fulfillment of the second set of predetermined criteria.

4. The arrangement of claim 3 , wherein the second set of predetermined criteria is fulfilled if:

the first attempt fails but the reason for the failure is not “service not allowed; and

the second attempt via the remaining type of connection has not been unsuccessfully performed earlier.

5. An arrangement for supporting location service information related to a mobile station in a mobile communications system supporting circuit-switched communications and packet-switched communications, the arrangement comprising:

means for receiving a request from a requesting entity;

means for retrieving the location service information related to the mobile station; and

means for providing a response to the request;

means for determining a preferred type of connection for said retrieving on the basis of a first set of predetermined criteria;

means for performing at least a first attempt to retrieve the location service information via the preferred type of connection; and

wherein the first type of connection is circuit-switched and the second type of connection is packet-switched.

6. The arrangement of claim 5 , wherein if the mobile station is having an on going call, the preferred type of connection is circuit-switched, otherwise it is packet-switched.

7. The arrangement of claim 5 , further comprising means for establishing circuit-switched communications for the mobile station if the packet-switched communications are not established.

8. The arrangement of claim 5 , further comprising means for establishing at least one implicit Packet Data Protocol context.

9. The arrangement of claim 8 , wherein the means for establishing the Packet Data Protocol context includes means for allocating a predefined Network layer Service Access Point Identifier value.

10. The arrangement of claim 8 , further comprising means for establishing at least one implicit Packet Data Protocol context between the mobile station and a support node.

11. The arrangement of claim 8 , further comprising means for establishing at least one implicit Packet Data Protocol context between the support node and a Serving Mobile Location Center currently serving the mobile station.

12. The arrangement of claim 8 , further comprising means for establishing at least one explicit Packet Data Protocol context between the support node and a Serving Mobile Location Center currently serving the mobile station.

13. An arrangement for supporting location service information related to a mobile station in a mobile communications system supporting circuit-switched communications and packet-switched communications, the arrangement comprising:

means for receiving a request from a requesting entity;

means for retrieving the location service information related to the mobile station; and

means for providing a response to the request;

means for determining a preferred type of connection for said retrieving on the basis of a first set of predetermined criteria;

means for performing at least a first attempt to retrieve the location service information via the preferred type of connection; and

wherein the arrangement is comprised in a Gateway Mobile Location Center.

14. The arrangement of claim 13 , wherein the request is received by the Gateway Mobile Location Center, the Gateway Mobile Location Center being configured to retrieve the location service information via a Mobile Services Switching Center, which in turn in configured to retrieve the location service information via a Serving Mobile Location Center, directly, if a circuit-switched connection has been established for the mobile station, and, otherwise, indirectly, via a Serving GPRS Support Node.

15. The arrangement of claim 14 , wherein the Gateway Mobile Location Center comprises means for sending to the Mobile Services Switching Center the address of the Serving GPRS Support Node.