Mobile communication system and method for processing handover procedure thereof
A method for processing a handover procedure in a mobile communication system is disclosed. After a type of handover is recognized based on information included in a handover command, a radio resource reconfiguration operation is selectively performed or a data transmission start point is adjusted, to thereby minimize an unnecessary operation occurring in the handover process and optimize a data transmission between a user equipment and a base station.
1. A method for processing a handover procedure by a user equipment (UE) of 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 information included in the received radio resource reconfiguration message,
wherein the information is mobility related information,
wherein the mobility related information includes each of a first parameter indicating a target physical cell identity and a second parameter indicating a new user equipment (UE) identity, and
wherein the first parameter is a physical cell identity (PCI) and the second parameter is a cell-radio network temporary identifier (C-RNTI); 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 based on whether a new C-RNTI or a new PCI exists in the radio resource reconfiguration message.
2. The method of claim 1 , wherein the radio resource reconfiguration message is a handover command.
3. The method of claim 1 , wherein the information further comprises a handover type indicator.
4. The method of claim 1 , wherein the first handover procedure indicates a procedure for handover between different base stations.
5. The method of claim 1 , wherein the second handover procedure indicates a procedure for handover in the same base station.
6. The method of claim 1 , further comprising:
if a transmission/reception acknowledgement information operation indicator is included in the information, starting data transmission after receiving transmission/reception acknowledgement information.
7. The method of claim 6 , wherein the transmission/reception acknowledgement information is a packet data convergence protocol (PDCP) status protocol data unit (PDU).
8. A mobile communication system, comprising:
a base station configured to transmit a radio resource reconfiguration message; and
a user equipment (UE) configured to
receive the radio resource reconfiguration message,
recognize a handover type based on information included in the received radio resource reconfiguration message, and
perform a first or second handover procedure according to the recognized handover type,
wherein the information is mobility related information,
wherein the mobility related information includes each of a first parameter indicating a target physical cell identity and a second parameter indicating a new user equipment (UE) identity,
wherein the first parameter is a physical cell identity (PCI) and the second parameter is a cell-radio network temporary identifier (C-RNTI), and
wherein the UE performs the first or second handover procedure based on whether a new C-RNTI or a new PCI exists in the radio resource reconfiguration message.
9. The system of claim 8 , wherein the radio resource reconfiguration message is a handover command.
10. The system of claim 8 , wherein the information further comprises a handover type indicator.
11. The system of claim 8 , wherein the first handover procedure indicates a procedure for handover between different base stations, and the second handover procedure indicates a procedure for handover within the same base station.
12. The system of claim 8 , wherein if a transmission/reception acknowledgement information operation indicator is included in the information, the UE starts data transmission after receiving transmission/reception acknowledgement information.
13. The system of claim 12 , wherein the transmission/reception acknowledgement information comprises a packet data convergence protocol (PDCP) status protocol data unit (PDU).
14. A user equipment configured to operate 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 information included in the received radio resource reconfiguration message, and
perform a first or second handover procedure according to the recognized handover type,
wherein the information is mobility related information,
wherein the mobility related information includes each of a first parameter indicating a target physical cell identity and a second parameter indicating a new user equipment (UE) identity,
wherein the first parameter is a physical cell identity (PCI) and the second parameter is a cell-radio network temporary identifier (C-RNTI), and
wherein the first or second handover procedure is performed based on whether a new C-RNTI or a new PCI exists in the radio resource reconfiguration message.