Mobility management in communication networks

• US 8,369,876 B2
• Filed: 05/15/2007
• Issued: 02/05/2013
• Est. Priority Date: 05/26/2006
• Status: Expired due to Fees

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Bachmann, Jens, Weniger, Kilian
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US12/302,262
• Publication Number:
  US 20100056175A1
• Time in Patent Office: 2,093 Days
• Field of Search: 455518-519, 4554561-457, 455/41.2, 455/432.1
• US Class Current: 455/456.5
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 8/08 Mobility data transfer

Abstract

The invention relates to a method for tracking locations of mobile terminals in a communication network. Further, the invention relates to a communication network and apparatuses therein capable of performing individual steps of the method according to different embodiments of the invention. To decrease the signaling load imposed by mobility related signaling the invention suggests to group mobile terminals in so called mobility groups and to reduce the signaling overhead by performing a location update on a per-mobility group basis. In one exemplary embodiment of the invention this is realized by only one of the mobile terminals in a mobility group sending a group location update on behalf of the group to trigger the location update for the mobility group. Alternatively, in another embodiment of the invention, a network operator trusted or controlled entity sends a group location update on behalf of the group to trigger the location update for the mobility group.

Claims

1. A method for tracking locations of mobile terminals in a communication network, the method comprising:

assigning by a mobility management entity mobile terminals to a mobility group, and informing the mobile terminals on their mobility group membership,

receiving by a serving mobility management entity of the communication network a group location update for the mobility group from a mobile terminal of the mobility group or a network operator trusted or controlled entity, and updating the locations of the mobile terminals of the mobility group based on the group location update, and

sending by the serving mobility management entity a confirmation for the group location update to the mobile terminals of the mobility group.

2. The method according to claim 1, further comprising scanning by the network operator trusted or controlled entity terminal identifiers of mobile terminals in the proximity of the network operator trusted or controlled entity and providing the scanned identifiers to the mobility management entity.

3. The method according to claim 2, further comprising assigning the mobile terminals identified by their respective terminal identifier to a mobility group associated to the network operator trusted or controlled entity.

4. The method according to claim 3, further comprising informing the identified mobile terminals on the mobility group to which they have been assigned.

5. The method according to claim 2, wherein the group location update is transmitted by the network operator trusted or controlled entity to the serving mobility management node.

6. The method according to claim 5, wherein the group location update comprises an indication of at least one of

at least one radio cell ID of at least one radio cell from which the mobile terminal receives or has received a beacon signal when/before sending the group location update, a radio cell sojourn time in the respective radio cell and an average radio cell sojourn time in the visited radio cells since sending the last group location update.

7. The method according to claim 1, further comprising determining a movement pattern of a respective mobile terminal and assigning the respective mobile terminal to a mobility group based on the movement pattern.

8. The method according to claim 7, wherein the movement pattern is determined by the mobility management entity tracking location updates of the respective mobile terminal.

9. The method according to claim 7, wherein the group location update comprises an indication of at least one of:

at least one radio cell ID of at least one radio cell from which the mobile terminal receives or has received a beacon signal when/before sending the group location update, a radio cell sojourn time in the respective radio cell and an average radio cell sojourn time in the visited radio cells since sending the last group location update.

10. The method according to claim 7, wherein mobile terminals having a similar movement patters are assigned to the same mobility group.

11. The method according to claim 1, further comprising:

broadcasting or multicasting a group identifier of the mobility group, and

receiving at the mobility management entity a registration message from a mobile terminal, the registration message comprising the group identifier and a mobile terminal identifier,

wherein the mobility management entity assigns the mobile terminal to the mobility group identified by the group identifier.

12. The method according to claim 1, further comprising receiving from a mobile terminal a registration message comprising a group identifier, and wherein the mobility management entity assigns the mobile terminal to a mobility group identified by the group identifier.

13. The method according to claim 1, further comprising receiving at the mobility management entity a group deregistration from a mobile terminal, and deregistering the mobile terminal from the mobility group in response thereto.

14. The method according to claim 1, wherein only a selected mobile terminal out of the mobile terminals belonging to a mobility group provides a group location update for all mobility group members to a serving mobility management entity.

15. The method according to claim 1, wherein the mobile terminals belonging to a mobility group randomly provide a group location update for all mobility group members to a serving mobility management entity.

16. The method according to claim 1, further comprising reconfiguring a user plane route for the mobile terminals assigned to the mobility group.

17. The method according to claim 16, wherein the user plane route is reconfigured upon change of the serving user plane entity responsible for routing user plane data to the mobile terminals of the mobility group.

18. The method according to claim 1, further comprising transferring mobility-related contexts from a previous mobility management entity to the serving mobility management entity upon reception of a group location update.

19. The method according to claim 18, wherein the transfer of the mobile terminal contexts is initiated by the serving mobility management entity by sending a message comprising at least a group identifier comprised in the group location update to the previous mobility management entity.

20. The method according to claim 18, further comprising identifying the previous mobility management entity by comprising an identifier of the previous mobility management entity to the group location update or by resolving a previous location indicated in the group location update.

21. The method according to claim 1, further comprising transferring routing-related contexts from a previous user plane entity to a serving user plane entity upon reception of a group location update.

22. The method according to claim 21, wherein the transfer of the mobile terminal contexts is initiated by the serving mobility management entity by sending a message comprising at least a group identifier comprised in the group location update to the previous mobility management entity.

23. The method according to claim 21, further comprising identifying the previous mobility management entity by comprising an identifier of the previous mobility management entity to the group location update or by resolving a previous location indicated in the group location update.

24. A method for tracking locations of mobile terminals in a communication network, the method comprising:

grouping the mobile terminals into at least one mobility group,

performing a location update on a per-mobility group basis, and

sending a confirmation for the location update to the mobile terminals grouped into the at least one mobility group.

25. The method according to claim 24, wherein only one of the mobile terminals in a mobility group sends the location update on behalf of the mobility group to trigger the location update for the mobility group.

26. The method according to claim 24, wherein a network operator trusted or controlled entity sends the location update on behalf of the mobility group to trigger the location update for the mobility group.

27. An apparatus for tracking locations of mobile terminals in a communication network, the apparatus comprising:

a processing unit that assigns terminals to a mobility group,

a transmitter that informs the mobile terminals on their mobility group membership, and

a receiver that receives a group location update for the mobility group from a mobile terminal of the mobility group or a network operator trusted or controlled entity,

wherein the processing unit is operable to update the locations of the mobile terminals of the mobility group based on the group location update, and

wherein the transmitter transmits a confirmation for the group location update to the mobile terminals of the mobility group.

28. A communication system for tracking locations of mobile terminals in a communication network, the communication system being configured to:

group the mobile terminals into at least one mobility group,

perform a location update on a per-mobility group basis, and

send a confirmation for the location update to the mobile terminals grouped into the at least one mobility group.

29. A mobile terminal for use in a communication network being divided in location areas to allow tracking the geographical position of mobile terminals, the mobile terminal comprising:

a receiver that receives an indication indicating a mobility group to which the mobile terminal is assigned or enabling the mobile terminal to select a mobility group,

a processing unit that determines a change of the location area within the communication network, and

a transmitter that transmits a group location update including an identifier of the mobility group to thereby trigger a location update for the mobile terminals grouped into the mobility group,

wherein a confirmation for the location update is sent to the mobile terminals grouped into the mobility group.

30. A non-transitory computer readable medium storing instructions that, when executed by a processor of a mobility control apparatus, cause the mobility control apparatus to track locations of mobile terminals in a communication network, by:

assigning by a mobility management entity mobile terminals to a mobility group,

informing the mobile terminals on their mobility group membership,

receiving by a serving mobility management entity of the communication network a group location update for the mobility group from a mobile terminal of the mobility group or a network operator trusted or controlled entity in the proximity of the mobile terminals of the mobility group,

updating the locations of the mobile terminals of the mobility group based on the group location update, and

sending by the serving mobility management entity a confirmation for the group location update to the mobile terminals of the mobility group.

31. A non-transitory computer readable medium storing instructions that, when executed by a mobile terminal for use in a communication network being divided in location areas to allow tracking the geographical position of mobile terminals, cause the mobile terminal to trigger a location update, by:

receiving an indication indicating a mobility group to which the mobile terminal is assigned or enabling the mobile terminal to select a mobility group,

determining a change of the location area within the communication network,

transmitting a group location update including an identifier of the mobility group to thereby trigger a location update for the mobile terminals grouped into the mobility group, and

transmitting a confirmation for the location update to the mobile terminals grouped into the mobility group.