APPARATUS, METHOD AND COMPUTER PROGRAM PRODUCT PROVIDING SYNCHRONIZED HANDOVER

• US 20100290427A1
• Filed: 01/11/2008
• Published: 11/18/2010
• Est. Priority Date: 01/12/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Dalsgaard, Lars, Sebire, Benoist, Koskela, Jarkko
• Granted Patent: US 9,301,215 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 40/36 due to handover
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A method is described which provides a synchronized HO of a mobile device. The method includes receiving a HO command. A determination is made of whether the HO command includes an indication of UL resource allocations. A C-RNTI is waited for in DL signaling if the HO command does not include the indication of UL resource allocations. If the HO command includes the indication of UL resource allocations, transmitting occurs based on the UL resource allocations. The method may be performed as a result of execution of computer program instructions stored in a computer readable memory medium. An apparatus is also described.

Claims

1. A method comprising:

receiving a handover command;

determining whether the handover command includes an indication of uplink resource allocations;

in response to a determination that the handover command does not include the indication of uplink resource allocations, waiting for a cell radio network temporary identifier in a downlink signaling; and

in response to a determination that the handover command includes the indication of uplink resource allocations, transmitting based on the uplink resource allocations.

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

in response to receiving the cell radio network temporary identifier in a downlink signaling before the expiration of a downlink signaling time, transmitting on an uplink shared channel; and

in response to not receiving the cell radio network temporary identifier in the downlink signaling before the expiration of the downlink signaling time, performing one of;

initiating a random access procedure in a random access channel while remaining in a radio resource control connected state, and

returning to a previous serving cell.

41. The method according to claim 1, wherein the handover command comprises a timing advance for a target cell of a handover.

3-40. -40. (canceled)

42. A computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer, the computer program code comprising:

code for receiving a handover command;

code for determining whether the handover command includes an indication of uplink resource allocations;

in response to a determination that the handover command does not include the indication of uplink resource allocations, code for waiting for a cell radio network temporary identifier in a downlink signaling; and

in response to a determination that the handover command includes the indication of uplink resource allocations, code for transmitting based on the uplink resource allocations.

43. A method comprising:

receiving a handover command;

determining whether the handover command includes an indication of uplink resource allocations;

in response to a determination that the handover command includes the indication of uplink resource allocations, accessing a new cell on a reserved portion of an uplink shared channel indicated in the handover command; and

in response to a determination that the handover command does not include the indication of uplink resource allocations, accessing a random access procedure in a random access channel.

44. The method according to claim 43, wherein the indication of uplink resource allocations comprises a dedicated random access preamble.

45. A computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer, the computer program code comprising:

code for receiving a handover command;

code for determining whether the handover command includes an indication of uplink resource allocations;

in response to a determination that the handover command includes the indication of uplink resource allocations, code for accessing a new cell on a reserved portion of an uplink shared channel which was indicated in the handover command;

in response to a determination that the handover command does not include the indication of uplink resource allocations, code for accessing a random access procedure in a random access channel.

46. An apparatus comprising:

a receiver configured to receive a handover command;

a processing unit; and

a transmitter,

wherein the processing unit is configured to determine whether the handover command includes an indication of uplink resource allocations, and to wait for a cell radio network temporary identifier in a downlink signaling in response to a determination that the handover command does not include the indication of uplink resource allocations, and

wherein the transmitter is configured to transmit based on the uplink resource allocations, in response to a determination that the handover command includes the indication of uplink resource allocations.

47. The apparatus according to claim 46, wherein the transmitter is configured:

to transmit on an uplink shared channel, in response to receiving the cell radio network temporary identifier in a downlink signaling before the expiration of a downlink signaling time; and

wherein at least one of the transmitter and the processing unit is configured to perform one of;

initiating a random access procedure in a random access channel while remaining in a radio resource control connected state, and

returning to a previous serving cell,

in response to not receiving the cell radio network temporary identifier in the downlink signaling before the expiration of the downlink signaling time.

48. The apparatus according to claim 47, wherein the downlink signaling time is based at least in part on at least one currently active service.

49. The apparatus according to claim 46, wherein the processing unit is further configured to apply a discontinuous reception period in a new cell when receiving an allocation table for appearance of the cell radio network temporary identifier.

50. The apparatus according to claim 49, wherein the discontinuous reception period is assigned by the handover command in a discontinuous reception signaling.

51. The apparatus according to claim 46, wherein the processing unit is further configured to initiate a handover timer at the start of a handover.

52. The apparatus according to claim 46, wherein the receiver is further configured to receive a timing advance via a random access channel in response to expiration of a handover timer.

53. The apparatus according to claim 46, wherein the processing unit is further configured to return to a previous serving cell in response to expiration of a handover timer.

54. The apparatus according to claim 46, wherein the transmitter is further configured to transmit on a reserved portion of an uplink shared channel indicated in the handover command when entering a new cell.

55. An apparatus comprising:

a receiver configured to receive a handover command;

a processing unit; and

a transmitter,

wherein the processing unit is configured to determine whether the handover command includes an indication of uplink resource allocations; and

wherein the transmitter is configured to access a new cell on a reserved portion of an uplink shared channel which was indicated in the handover command in response to a determination that the handover command includes the indication of uplink resource allocations and to access a random access procedure in a random access channel in response to a determination that the handover command does not include the indication of uplink resource allocations.

56. The apparatus according to claim 55, wherein the indication of uplink resource allocations comprises a dedicated random access preamble.

57. The apparatus according to claim 55, wherein the processing unit is further configured to return to a previous serving cell in response to expiration of a handover timer.

58. The apparatus according to claim 55, wherein the handover command comprises an expiration time of the uplink resources.