Control signaling method and apparatus in a coordinated multi-point system

1. A method to perform a control signaling by a user equipment in a coordinated multi-point (CoMP) system, the method comprising:

receiving first control information scrambled using a CoMP radio network temporary identifier (RNTI) assigned to the CoMP system;

receiving, through a data channel decoded by the user equipment using the first control information, a cell information block (CIB), generated by a CoMP enhanced node b (eNB) of a plurality of CoMP eNBs in the CoMP system, containing associated cell information on each of the plurality of CoMP eNBs included in the CoMP system;

storing the associated cell information contained in the CIB to refer to the associated cell information in a handover procedure;

receiving second control information that is scrambled using a cell RNTI (C-RNTI) of the user equipment and that indicates a target cell for the handover procedure; and

performing the handover procedure to the target cell based on the second control information,

wherein the user equipment communicates with the plurality of CoMP eNBs and the plurality of CoMP eNBs is scheduled to communicate with the user equipment by the CoMP eNB, and

wherein the second control information contains a CoMP cell index to identify the target cell within the CoMP system.

2. The method as claimed in claim 1 , wherein the CIB contains information on a CoMP cell index to identify each of the plurality of CoMP eNBs within the CoMP system and a physical random access channel (PRACH) configuration parameter used to initially access each of the plurality of CoMP eNBs.

3. The method as claimed in claim 1 , wherein the CIB contains a CoMP cell index to identify each of the plurality of CoMP eNBs within the CoMP system, a mapping table of a cell identifier to identify each of the plurality of CoMP eNBs in an entire radio cellular system, and a Physical Random Access Channel (PRACH) configuration parameter used to initially access each of the plurality of CoMP eNBs.

4. The method as claimed in claim 1 , wherein the first control information is transmitted using downlink control information (DCI) format 1A of the control channel.

5. The method as claimed in claim 1 , wherein the second control information is transmitted using downlink control information (DCI) format 1C.

6. The method as claimed in claim 1 , wherein performing the handover procedure comprises:

generating a PRACH preamble sequence for the target cell based on the CIB; and

transmitting the PRACH preamble sequence to a target eNB of the target cell.

7. A user equipment apparatus to perform control signaling in a coordinated multi-point (CoMP) system, the user equipment apparatus comprising:

a transceiver configured to receive first control information scrambled using a CoMP radio network temporary identifier (RNTI) assigned to the CoMP system, and receive, through a data channel based on the first control information, a cell information block (CIB), generated by a CoMP enhanced node b (eNB) of a plurality of CoMP eNBs in the CoMP system, containing associated cell information of each of the plurality of CoMP eNB included in the CoMP system; and

a controller configured to analyze the first control information and the CIB, store the associated cell information contained in the CIB in a memory to refer to the associated cell information in a handover procedure, and decode the data channel using the first control information to receive the CIB,

wherein the user equipment communicates with the plurality of the CoMP eNBs and the plurality of CoMP eNBs is scheduled to communicate with the user equipment by the CoMP eNB,

wherein the transceiver is configured to receive second control information that indicates a target cell for the handover procedure and that is scrambled using a cell RNTI (C-RNTI) of the user equipment, and the controller is configured to perform the handover procedure to the target cell based on the second control information, and

wherein the second control information contains a CoMP cell index to identify the target cell within the CoMP system.

8. The user equipment apparatus as claimed in claim 7 , wherein the CIB contains information on a CoMP cell index to identify each of the plurality of CoMP eNBs within the CoMP system and a physical random access channel (PRACH) configuration parameter used to initially access each of the plurality of CoMP eNBs.

9. The user equipment apparatus as claimed in claim 7 , wherein the CIB contains a CoMP cell index to identify each of the plurality of CoMP eNBs within the CoMP system, a mapping table of a cell identifier to identify each of the plurality of CoMP eNBs in an entire radio cellular system, and a physical random access channel (PRACH) configuration parameter used to initially access each of the plurality of CoMP eNBs.

10. The user equipment apparatus as claimed in claim 7 , wherein the first control information is transmitted using downlink control information (DCI) format 1A.

11. The user equipment apparatus as claimed in claim 7 , wherein the second control information is transmitted using downlink control information (DCI) format 1C.

12. The user equipment apparatus as claimed in claim 7 , wherein the controller is configured to generate a PRACH preamble sequence for the target cell based on the CIB, and the transceiver is configured to transmit the PRACH preamble sequence to a target eNB of the target cell.