| Sonstiges: |
- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20120329461
- Publication Date: December 27, 2012
- Appl. No: 13/383093
- Application Filed: December 15, 2011
- Assignees: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) (Stockholm, SE)
- Claim: 1.-32. (canceled)
- Claim: 33. A method for maintaining neighbor cell information at a mobile relay node in a wireless communication system, the method comprising: detecting the occurrence of a defined condition which characteristically indicates that movement of the mobile relay node has rendered previously obtained neighbor cell information incomplete or invalid; responsive to detecting the occurrence of the defined condition, sending a request for neighbor cell information to a donor base station in the system; and receiving the requested neighbor cell information responsive to the request.
- Claim: 34. The method of claim 33, further comprising generating the request to include identifiers for one or more cells currently neighboring a mobile cell provided by the mobile relay node, and wherein said receiving comprises receiving neighbor cell information that pertains to those one or more neighboring cells.
- Claim: 35. The method of claim 34, wherein said generating comprises generating the request to include identifiers of any cells detected by the mobile relay node and identifiers any cells detected by mobile terminals served by the mobile relay node.
- Claim: 36. The method of claim 34, wherein said generating comprises generating the request to include non-unique cell identifiers for said one or more neighboring cells, and wherein said receiving comprises receiving neighbor cell information that maps those non-unique cell identifiers to corresponding unique cell identifiers.
- Claim: 37. The method of claim 34, wherein said generating comprises selecting from a set of identifiers obtained by the mobile relay node a subset of those identifiers that have been obtained within a defined time period, and including said subset of identifiers in the request.
- Claim: 38. The method of claim 37, further comprising dynamically adapting said defined time period proportional to a speed at which the mobile relay node is currently moving.
- Claim: 39. The method of claim 33, wherein said defined condition comprises a defined number of non-unique cell identifiers being obtained by the mobile relay node for which the mobile relay node does not have corresponding unique cell identifiers.
- Claim: 40. The method of claim 33, wherein said defined condition comprises a defined number of non-unique cell identifiers being obtained by the mobile relay node for which the mobile relay node does not have corresponding unique cell identifiers and for which signal measurements have been reported by a particular mobile terminal that meet or exceed a predefined measurement threshold.
- Claim: 41. The method of claim 33, wherein said defined condition comprises any given non-unique cell identifier being reported to the mobile relay node a defined number of times by different mobile terminals served by the mobile relay node.
- Claim: 42. The method of claim 33, wherein said defined condition comprises a defined amount of time elapsing since the mobile relay node previously obtained neighbor cell information.
- Claim: 43. The method of claim 42, further comprising dynamically adapting said defined amount of time proportional to a speed at which the mobile relay node is currently moving.
- Claim: 44. The method of claim 33, wherein said defined condition comprises the mobile relay node being handed over from one donor base station to another.
- Claim: 45. The method of claim 33, further comprising: storing the received neighbor cell information and associating that neighbor cell information with the donor base station in a mapping table; and responsive to subsequent handover of the mobile relay node to the donor base station, reverting to stored neighbor cell information that, according to the mapping table, is associated with the donor base station and selectively requesting neighbor cell information from the donor base station that pertains to any currently detected neighbor cells not addressed in the stored neighbor cell information.
- Claim: 46. The method of claim 33, wherein the wireless communication system is a Long Term Evolution (LTE) system.
- Claim: 47. A method implemented by a donor base station in a wireless communication system for providing neighbor cell information to a mobile relay node, the method comprising: receiving identifying information that identifies one or more cells currently neighboring a mobile cell provided by the mobile relay node; selecting from a set of neighbor cell information stored at the donor base station a subset of information which pertains to the one or more identified cells; and transmitting the selected subset of neighbor cell information for providing that subset to the mobile relay node.
- Claim: 48. The method of claim 47, wherein said receiving comprises receiving non-unique cell identifiers for said one or more identified cells, and wherein the selected subset of neighbor cell information comprises a selected subset of unique cell identifiers mapped to the received non-unique cell identifiers.
- Claim: 49. The method of claim 47, wherein the wireless communication system is a Long Term Evolution (LTE) system, wherein a non-unique cell identifier comprises a physical cell identity (PCI), and wherein a unique cell identifier comprises a cell global identity (CGI).
- Claim: 50. The method of claim 47, wherein said receiving comprises receiving a handover message from a source donor base station and extracting the identifying information from that handover message.
- Claim: 51. The method of claim 47, further comprising: storing the selected subset and associating that subset with the mobile relay node in a mapping table; updating any neighbor cell information in the stored subset responsive to receiving a notification that such information has changed; and responsive to subsequent handover of the mobile relay node to the donor base station, selectively sending the mobile relay node updates to the stored subset that, according to the mapping table, is associated with the mobile relay node.
- Claim: 52. A method implemented by a source donor base station for handing over a mobile relay node to a target donor base station in a wireless communication system, the method comprising: receiving identifying information that identifies one or more cells currently neighboring a mobile cell provided by the mobile relay node; determining to handover the mobile relay node to the target donor base station; and responsive to said determination, sending a handover message to the target donor base station that includes said identifying information.
- Claim: 53. The method of claim 52, wherein said identifying information includes non-unique cell identifiers for said one or more identified cells.
- Claim: 54. The method of claim 53, wherein the wireless communication system is a Long Term Evolution (LTE) system, wherein a non-unique cell identifier comprises a physical cell identity (PCI), and wherein a unique cell identifier comprises a cell global identity (CGI).
- Claim: 55. A method implemented by a mobile relay node for handover of a mobile terminal in a wireless communication system, wherein the method comprises: determining to handover the mobile terminal to a target cell identified by a non-unique cell identifier; responsive to recognizing that a mapping at the mobile relay node does not map the non-unique cell identifier of the target cell to a corresponding unique cell identifier, generating a handover message for initiating said handover to include the non-unique cell identifier of the target cell; and sending the generated handover message towards the target cell via a donor base station that is configured to resolve non-unique cell identifiers.
- Claim: 56. The method of claim 55, wherein said determining comprises: receiving a report from the mobile terminal that identifies each of one or more candidate cells with a non-unique cell identifier; and selecting one of those candidate cells as the target cell to which the mobile terminal is to be handed over.
- Claim: 57. The method of claim 55, further comprising: receiving a message from the donor base station indicating that the base station cannot resolve the non-unique cell identifier included in the generated handover message; responsive to receiving said message from the donor base station, instructing the mobile terminal to detect the unique cell identifier of the target cell from system information broadcast by the target cell; and receiving the unique cell identifier detected by the mobile terminal.
- Claim: 58. The method of claim 57, further comprising generating another handover message for initiating said handover to include the unique cell identifier received from the mobile terminal, and sending that handover message towards the donor base station.
- Claim: 59. The method of claim 57, further comprising sending the unique cell identifier received from the mobile terminal to the donor base station.
- Claim: 60. The method of claim 55, further comprising, responsive to recognizing that the mapping at the mobile relay node does map the non-unique cell identifier of the target cell to a corresponding unique cell identifier, generating the handover message to include the unique cell identifier of the target cell.
- Claim: 61. The method of claim 55, wherein the wireless communication system is a Long Term Evolution (LTE) system, wherein a non-unique cell identifier comprises a physical cell identity (PCI), and wherein a unique cell identifier comprises a cell global identity (CGI).
- Claim: 62. A method implemented by a donor base station for handover of a mobile terminal in a wireless communication system, the method comprising: receiving a handover message from a mobile relay node that includes a non-unique cell identifier of a target cell to which the mobile terminal is to be handed over; resolving the non-unique cell identifier of the target cell by retrieving a corresponding unique cell identifier from a mapping of non-unique cell identifiers to unique cell identifiers; modifying the handover message by replacing the non-unique cell identifier in the message with the retrieved unique cell identifier; and forwarding the modified handover message towards the target cell for initiating said handover.
- Claim: 63. The method of claim 62, further comprising: receiving a second handover message from the mobile relay node that includes a non-unique cell identifier of a second target cell to which a second mobile terminal is to be handed over; responsive to recognizing that said mapping at the donor base station does not map the non-unique cell identifier of the second target cell to a corresponding unique cell identifier, generating an error message that indicates the donor base station cannot resolve the non-unique cell identifier included in the second handover message; and sending the error message to the mobile relay node.
- Claim: 64. The method of claim 27, further comprising: receiving the unique cell identifier of the second target cell from the mobile relay node in response to said error message; and updating said mapping at the donor base station to map the non-unique cell identifier of the second target cell to the received unique cell identifier.
- Claim: 65. The method of claim 27, wherein the wireless communication system is a Long Term Evolution (LTE) system, wherein a non-unique cell identifier comprises a physical cell identity (PCI), and wherein a unique cell identifier comprises a cell global identity (CGI).
- Claim: 66. A mobile relay node in a wireless communication system comprising a transceiver and one or more processing circuits, wherein the one or more processing circuits are configured to maintain neighbor cell information at the mobile relay node by: detecting the occurrence of a defined condition which characteristically indicates that movement of the mobile relay node has rendered previously obtained neighbor cell information incomplete or invalid; responsive to detecting the occurrence of the defined condition, sending a request for neighbor cell information to a donor base station in the system; and receiving the requested neighbor cell information responsive to the request.
- Claim: 67. A mobile relay node configured to handover a mobile terminal in a wireless communication system, the mobile relay node comprising a transceiver and one or more processing circuits configured to: determine to handover the mobile terminal to a target cell identified by a non-unique cell identifier; responsive to recognizing that a mapping at the mobile relay node does not map the non-unique cell identifier of the target cell to a corresponding unique cell identifier, generate a handover message for initiating said handover to include the non-unique cell identifier of the target cell; and send the generated handover message towards the target cell via a donor base station that is configured to resolve non-unique cell identifiers.
- Claim: 68. A donor base station in a wireless communication system for providing neighbor cell information to a mobile relay node, the donor base station comprising a transceiver, a network interface, and one or more processing circuits configured to: receive identifying information that identifies one or more cells currently neighboring a mobile cell provided by the mobile relay node; select from a set of neighbor cell information stored at the donor base station a subset of information which pertains to the one or more identified cells; and transmit the selected subset of neighbor cell information for providing that subset to the mobile relay node.
- Claim: 69. A donor base station configured to handover a mobile terminal in a wireless communication system, the donor base station comprising a transceiver, a network interface, and one or more processing circuits configured to: receive a handover message from a mobile relay node that includes a non-unique cell identifier of a target cell to which the mobile terminal is to be handed over; resolve the non-unique cell identifier of the target cell by retrieving a corresponding unique cell identifier from a mapping of non-unique cell identifiers to unique cell identifiers; modify the handover message by replacing the non-unique cell identifier in the message with the retrieved unique cell identifier; and forward the modified handover message towards the target cell for initiating said handover.
- Claim: 70. A source donor base station for handing over a mobile relay node to a target donor base station in a wireless communication system, the source donor base station comprising a transceiver, a network interface, and one or more processing circuits configured to: receive identifying information that identifies one or more cells currently neighboring a mobile cell provided by the mobile relay node; determine to handover the mobile relay node to the target donor base station; and responsive to said determination, send a handover message to the target donor base station that includes said identifying information.
- Current U.S. Class: 455/437
- Current International Class: 04; 04; 04; 04
|
