Mobile communication system and method for processing handover procedure thereof

• US 9,264,953 B2
• Filed: 08/18/2014
• Issued: 02/16/2016
• Est. Priority Date: 02/04/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Sung Duck, Yi, Seung June, Park, Sung Jun, Lee, Young Dae
• Primary Examiner(s): HOANG, THAI D
• Application Number:
  US14/461,969
• Publication Number:
  US 20140355569A1
• Time in Patent Office: 547 Days
• Field of Search: 370331-334, 455436-444
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 36/08 Reselecting an access point

Abstract

A method for processing a handover procedure by a user equipment (UE) in a mobile communication system. The method includes receiving, by the UE, a radio resource reconfiguration message from a base station; recognizing, by the UE, a handover type based on a handover type indicator included in the received radio resource reconfiguration message; and performing, by the UE, a first or second handover procedure according to the recognized handover type. The first or second handover procedure is performed if the radio resource reconfiguration message includes mobility related information. The mobility related information includes a target physical cell identity and a new cell-radio network temporary identifier (C-RNTI).

Claims

1. A method for processing a handover procedure by a user equipment (UE) in a mobile communication system, the method comprising:

receiving, by the UE, a radio resource reconfiguration message from a base station;

recognizing, by the UE, a handover type based on a handover type indicator included in the received radio resource reconfiguration message; and

performing, by the UE, a first or second handover procedure according to the recognized handover type,

wherein the first or second handover procedure is performed if the radio resource reconfiguration message includes mobility related information, and

wherein the mobility related information includes a target physical cell identity and a new cell-radio network temporary identifier (C-RNTI).

2. The method of claim 1, wherein the radio resource reconfiguration message is a handover command.

3. The method of claim 1, wherein the first handover procedure relates to a procedure for an intra Node B handover.

4. The method of claim 1, wherein the second handover procedure relates to a procedure for an inter Node B handover.

5. The method of claim 1, further comprising:

reconfiguring, by the UE, a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity if the handover type indicator indicates the first handover procedure.

6. The method of claim 5, further comprising:

transmitting, by the UE, a PDCP status protocol data unit (PDU) if the PDCP entity is reconfigured.

7. The method of claim 1, further comprising:

not reconfiguring, by the UE, a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity if the handover type indicator indicates the second handover procedure.

8. A user equipment configured to operate a handover procedure in a mobile communication system, the user equipment comprising:

a processor configured to;

receive a radio resource reconfiguration message from a base station,

recognize a handover type based on a handover type indicator included in the received radio resource reconfiguration message, and

perform a first or second handover procedure according to the recognized handover type,

wherein the first or second handover procedure is performed if the radio resource reconfiguration message includes mobility related information, and

wherein the mobility related information includes a target physical cell identity and a new cell-radio network temporary identifier (C-RNTI).

9. The user equipment of claim 8, wherein the radio resource reconfiguration message is a handover command.

10. The user equipment of claim 8, wherein the first handover procedure relates to a procedure for an intra Node B handover.

11. The user equipment of claim 8, wherein the second handover procedure relates to a procedure for an inter Node B handover.

12. The user equipment of claim 8, wherein the processor is further configured to reconfigure a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity if the handover type indicator indicates the first handover procedure.

13. The user equipment of claim 12, wherein the processor is further configured to transmit a PDCP status protocol data unit (PDU) if the PDCP entity is reconfigured.

14. The user equipment of claim 8, wherein the processor is further configured not to reconfigure a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity if the handover type indicator indicates the second handover procedure.