System network and method for the transference of cell handover information

• US 6,131,030 A
• Filed: 08/19/1998
• Issued: 10/10/2000
• Est. Priority Date: 08/19/1998
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Palm, Lars Hakan, Schon, Erik, Rune, Goran, Willars, Per
• Primary Examiner(s): Vo, Nguyen
• Assistant Examiner(s): BANKS HAROLD, MARSHA DENISE
• Application Number:
  US09/136,696
• Time in Patent Office: 783 Days
• Field of Search: 455/422, 455/432, 455/436, 455/439, 455/440, 455/438, 455/450, 455/509, 455/560, 455/561
• US Class Current: 455/438
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 88/12 Access point controller devices
• CPC Class Codes: H04W 92/20 between access points

Abstract

A system network and method improving handovers, particularly for reducing the amount of inter-cellular transfer information stored in base station controllers or radio network controllers, is disclosed. Instead of storing routing information for every possible inter-cellular handover at each control node, signaling network technology is employed to effectuate communication of all relevant inter-cellular handover information between all of the control nodes, thereby coordinating routing information transference across a distributed system.

Claims

1. A radio access network having a multiplicity of cells and a mobile station in communication with said radio access network through a given one of said cells, said radio access network comprising:

a serving radio network controller controlling a plurality of cells within said radio access network and controlling said mobile station;

a plurality of drift radio network controllers each controlling respective other pluralities of said cells; and

signaling connection means connecting said serving and drift radio network controllers and providing signaling connections therebetween;

a serving controller memory attached to said serving radio network controller, said memory having a permanent portion and a control portion, said permanent portion comprising a plurality of identifiers of cells and signaling addresses for radio network controllers adjacent said serving radio network controller, said control portion containing signaling addresses of cells adjacent said given cell and identifiers of other radio network controllers adjacent the radio network controller of said given cell, and wherein the permanent portion of said serving controller memory contains no identifiers of a plurality of remote cells and no signaling addresses for remote radio network controllers, said remote radio network controllers being non-adjacent said serving radio network controller, whereby via said signaling connection means said serving controller controls radio resource allocation for handovers of said mobile station to another cell within said radio access network.

2. The radio access network of claim 1, wherein said given and another cells are under the control of said serving radio network controller, said serving radio network controller allocating radio resources therein for said handover.

3. The radio access network of claim 2, wherein said another cell is adjacent a first remote cell of a first drift radio network controller, said serving radio network controller having a serving controller memory containing identifiers for said first remote cell and a signaling address for said first drift radio network controller therein.

4. The radio access network of claim 1, wherein said given cell is under the control of said serving radio network controller and said another cell is under the control of a first drift radio network controller, said given and another cells and said serving and said first drift radio network controllers being adjacent, respectively, said serving radio network controller having a serving controller memory containing identifiers for said another cell and a second remote cell and a signaling address for said first drift radio network controller, said serving radio network controller controlling said handover to said another cell by allocating said radio resources within said first drift radio network controller using said signaling connection means.

5. The radio access network of claim 4, wherein said given and said another cells are under the control of said first drift radio network controller.

6. The radio access network of claim 1, wherein said given cell is under the control of a first drift radio network controller and said another cell is under the control of a second drift radio network controller, said first and second drift radio network controllers being non-adjacent said serving radio network controller and containing remote identifiers therein for respective cells adjacent said given and other cells, said serving radio network controller having a serving controller memory containing identifiers for respective other cells and signaling addresses for respective other radio network controllers adjacent said serving radio network controller, said serving controller memory containing none of said remote identifiers.

7. The radio access network of claim 6, wherein said serving radio network controller receives a plurality of said remote identifiers for the respective cells adjacent said given and another cells from said first drift radio network controller across said signaling connection means and controls said handover to said another cell by allocating radio resources within said second drift radio network controller using said signaling connection means.

8. The radio access network of claim 1, wherein each of the plurality of drift radio network controllers include a respective drift controller memory associated therewith, each of said memories having a permanent portion each substantially consisting of a plurality of respective identifiers of adjacent cells and signaling addresses for radio network controllers and no identifiers of non-adjacent cells and no signaling addresses for remote radio network controllers.

9. The radio access network of claim 1, wherein said control portion of said serving controller memory contains a plurality of identifiers of adjacent cells and signaling addresses for radio network controllers for said mobile station in said given cell.

10. The radio access network of claim 9, wherein, upon handover of said mobile station to said another cell, another plurality of identifiers of cells and signaling addresses for radio network controllers adjacent said another cell are stored within said control portion of said serving controller memory.

11. The radio access network of claim 1, wherein said signaling connection means comprises a Signaling System 7 (SS7) compatible system employing SS7 protocols.

12. The radio access network of claim 1, wherein said radio access network is macro-diversity compatible, said mobile station being in communication with said radio access network through a plurality of active cells.

13. The radio access network of claim 12, wherein said radio access network is a Code Division Multiple Access System.

14. The radio access network of claim 13, wherein said radio access network is a Wideband Code Division Multiple Access System.

15. The radio access network according to claim 1, wherein said serving radio network controller forwards a resource allocation request for handover of said mobile station to said another cell.

16. The radio access network according to claim 15, wherein a given one of said plurality of drift radio network controllers responds to said resource allocation request of said serving radio network controller.

17. The radio access network according to claim 16, wherein said given one of said drift radio network controllers forwards neighboring cell information to said serving radio network controller.

18. The radio access network according to claim 17, wherein said neighboring cell information passes through at least one additional drift radio network controller to said serving radio network controller, at least one of said additional drift radio network controllers saving said neighboring cell information therein.

19. The radio access network according to claim 17, wherein said neighboring cell information comprises at least one cell identifier associated with said another cell.

20. The radio access network according to claim 17, wherein said neighboring cell information comprises at least one signaling address associated with said another cell.

21. In a radio access network having a multiplicity of cells and a mobile station in communication with said radio access network through a given one of said cells, a method for handover of said mobile station to another of said cells, said method comprising the steps of:

transmitting, by a serving radio network controller for said mobile station, a resource allocation request for handover of said mobile station to said another cell, said resource allocation request being sent across a signaling connection means interconnecting said serving and a plurality of other radio network controllers;

allocating resources within said another cell associated with said handover;

handing over said mobile station to said another cell;

updating a serving controller memory, associated with said serving radio network controller, with cell identifiers and radio network controller signaling addresses associated with and neighboring said another cell, wherein said serving controller memory has a permanent portion comprising a plurality of identifiers of adjacent cells and signaling addresses for radio network controllers and no identifiers of remote cells and no signaling addresses for remote radio network controllers, said remote radio network controllers and remote cells associated therewith being non-adjacent said serving radio network controller.

22. The method according to claim 21, further comprising, after said step of transmitting, the step of:

responding, by a drift radio network controller controlling said another cell, to said resource allocation request of said serving radio network controller, said response being sent across said signaling connection means to said serving radio network controller.

23. The method according to claim 22, wherein in said step of responding, said drift radio network controller for said another cell forwards neighboring cell information to said serving radio network controller.

24. The method according to claim 23, wherein said neighboring cell information passes through at least one additional drift radio network controller to said serving radio network controller, at least one of said additional drift radio network controllers saving said neighboring cell information therein.

25. The method according to claim 23, wherein said neighboring cell information comprises at least one cell identifier associated with said another cell.

26. The method according to claim 23, wherein said neighboring cell information comprises at least one signaling address associated with said another cell.

27. The method according to claim 21, wherein said serving controller memory has a permanent portion and a control portion, wherein, prior to said handover, said control portion contains signaling addresses for cells adjacent said given cell and signaling addresses for radio network controllers adjacent the radio network controller of said given cell, and wherein, after updating, said control portion contains identifiers of cells adjacent said another cell and identifiers of radio network controllers adjacent the radio network controller of said another cell.

28. The method according to claim 21, wherein said resource allocation request across said signaling connection means is compatible with Signaling System 7 protocols.

29. The method according to claim 21, wherein said radio access network is macro-diversity compatible, said mobile station being in communication with said radio access network through a plurality of active cells.

30. The method according to claim 29, wherein said radio access network is a Code Division Multiple Access System.

31. The method according to claim 30, wherein said radio access network is a Wideband Code Division Multiple Access System.

32. A serving radio network controller for a mobile station in a given cell of radio access network, said serving radio network controller comprising:

a serving controller memory having a permanent portion therein, said permanent portion containing a plurality of identifiers of cells and radio network controllers adjacent said serving radio network controller and cells therein, said permanent portion containing no identifiers of a plurality of remote cells and no signaling addresses for remote radio network controllers of said radio access network, said remote radio network controllers and respective remote cells associated therewith being non-adjacent said serving radio network controller.

33. The serving radio network controller according to claim 32, wherein said serving controller memory further comprises a control portion containing signaling addresses for cells adjacent said given cell and identifiers of other radio network controllers adjacent the radio network controller of said given cell.

34. The serving radio network controller according to claim 32, wherein said serving radio network controller communicates with adjacent and remote other radio network controllers via a signaling connection means interconnecting said controllers and providing signaling connections therebetween.

35. The serving radio network controller according to claim 34, wherein said serving radio network controller coordinates a handover of said mobile station from said given cell to another cell utilizing said signaling connection means.

36. The serving radio network controller according to claim 34, wherein said signaling connection means comprises a Signaling System 7 (SS7) compatible system employing SS7 protocols.

37. The serving radio network controller according to claim 32, wherein said radio access network is macro-diversity compatible, said mobile station being in communication with said radio access network through a plurality of active cells.

38. The serving radio network controller according to claim 37, wherein said radio access network is a Code Division Multiple Access System.

39. The serving radio network controller according to claim 38, wherein said radio access network is a Wideband Code Division Multiple Access System.

40. The serving radio network controller according to claim 32, wherein said serving radio network controller forwards a resource allocation request for handover of said mobile station to another cell.

41. The serving radio network controller according to claim 40, wherein a given one of said radio network controllers responds to said resource allocation request of said serving radio network controller.

42. The serving radio network controller according to claim 41, wherein said given one of said radio network controllers forwards neighboring cell information to said serving radio network controller.

43. The serving radio network controller according to claim 42, wherein said neighboring cell information passes through at least one additional radio network controller to said serving radio network controller, at least one of said additional radio network controllers saving said neighboring cell information therein.

44. The serving radio network controller according to claim 42, wherein said neighboring cell information comprises at least one cell identifier associated with said another cell.

45. The serving radio network controller according to claim 42, wherein said neighboring cell information comprises at least one signaling address associated with said another cell.