Method for indicating a DM-RS antenna port in a wireless communication system

Abstract

A control information interpretation method of a terminal and a base station in a mobile communication system, and a terminal and a base station concerning the same, respectively, are provided. The control information interpretation method of a terminal includes receiving, by the terminal, control information including transport block information and antenna port related information; identifying whether a codeword 0 is enabled and a codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled based on the transport block information; and interpreting the antenna port related information according to a result of the identification.

What is claimed is: 
     
       1. A control information interpretation method of a terminal in a mobile communication system, comprising:
 receiving, by the terminal, control information including transport block information and antenna port related information;   identifying whether a codeword 0 is enabled and a codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled based on the transport block information; and   interpreting the antenna port related information according to a result of the identification.   
     
     
       2. The method of  claim 1 , wherein, if the codeword 0 is enabled and the codeword 1 is disabled, the antenna port related information is configured to indicate up to 4 antenna ports for 4 layers,
 wherein a reference signal (RS) for one layer includes one of a combination of 0 or 1 and a 1st antenna port or a 2nd antenna port,   wherein RSs for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port, and   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port.   
     
     
       3. The method of  claim 1 , wherein, if both the codeword 0 and the codeword 1 are enabled, the antenna port related information is configured to indicate up to 8 antenna ports for 8 layers,
 wherein reference signals (RSs) for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port,   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port,   wherein RSs for five layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, and a 5th antenna port,   wherein RSs for six layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, and a 6th antenna port,   wherein RSs for seven layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, and a 7th antenna port, and   wherein RSs for eight layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, the 7th antenna port, and an 8th antenna port.   
     
     
       4. The method of  claim 1 , wherein the antenna port related information includes a maximum rank set to 4, and when the codeword 0 is enabled and the codeword 1 is disabled, a scrambling sequence of 0 or 1 for a rank 1 or 2, and a scrambling sequence 0 for a rank 3. 
     
     
       5. The method of  claim 1 , wherein the antenna port related information includes a maximum rank set to 8, and when both the codeword 0 and the codeword 1 are enabled, a scrambling sequence of 0 or 1 for a rank 2 and a scrambling sequence 0 for a rank 3. 
     
     
       6. The method of  claim 1 , wherein interpreting the antenna port related information according to the result of the identification comprises:
 interpreting the antenna port related information for a rank 1, when the codeword 0 is enabled and the codeword 1 is disabled and a current transmission is an initial transmission;   interpreting the antenna port related information for all ranks, when the codeword 0 is enabled and the codeword 1 is disabled and a current transmission is a retransmission; and   interpreting the antenna port related information for all the ranks at the initial transmission and the retransmission, when both the codeword 0 and the codeword 1 are enabled.   
     
     
       7. The method of  claim 1 , wherein the control information includes indication information for notifying the terminal as to whether a number of other terminals allocated at least one layer transmitted by a base station is greater than or equal to 1. 
     
     
       8. The method of  claim 1 , wherein the antenna port related information includes at least one of an index indicating a DeModulation Reference Signal (DM-RS) antenna port 0 allocated a scrambling code 0 in rank pattern 2, an index indicating a DM-RS antenna port 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna port 0 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna port 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, and 2 allocated scrambling code 0 in rank pattern 4, and a index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, when the codeword 0 is enabled and the codeword 1 is disabled, and
 at least one of an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1 and 2 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0, 1, 2, 3, and 4 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, and 5 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, and 6 allocated scrambling code 0 in rank pattern 8, and an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, 6, and 7 allocated scrambling code 0 in rank pattern 8, when both the codeword 0 and the codeword 1 are enabled,   wherein the DM-RS antenna port 0 is a first antenna port allocated a DM-RS among all Reference Signals (RSs), and an arbitrary DM-RS antenna port n is indexed in ascending order from the DM-RS antenna port 0.   
     
     
       9. A control information transmission method of a base station in a mobile communication system, comprising:
 determining, by the base station, whether a codeword 0 is enabled and a codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled;   selecting antenna port related information according to a result of the determination;   generating control information including transport block information indicating whether the codeword 0 is enabled and the codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled and the antenna port related information; and   transmitting the control information to the terminal.   
     
     
       10. The method of  claim 9 , wherein, if the codeword 0 is enabled and the codeword 1 is disabled, the antenna port related information is configured to indicate up to 4 antenna ports for 4 layers,
 wherein a reference signal (RS) for one layer includes one of a combination of 0 or 1 and a 1st antenna port or a 2nd antenna port,   wherein RSs for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port, and   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port.   
     
     
       11. The method of  claim 9 , wherein, if both the codeword 0 and the codeword 1 are enabled, the antenna port related information is configured to indicate up to 8 antenna ports for 8 layers,
 wherein reference signals (RSs) for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port,   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port,   wherein RSs for five layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, and a 5th antenna port,   wherein RSs for six layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, and a 6th antenna port,   wherein RSs for seven layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, and a 7th antenna port, and   wherein RSs for eight layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, the 7th antenna port, and an 8th antenna port.   
     
     
       12. The method of  claim 9 , wherein the antenna port related indication information includes a maximum rank set to 4, and when the codeword 0 is enabled and the codeword 1 is disabled, a scrambling sequence of 0 or 1 for a rank 1 or 2, and a scrambling sequence 0 for a rank 3. 
     
     
       13. The method of  claim 9 , wherein the antenna port related information includes a maximum rank set to 8, and when both the codeword 0 and the codeword 1 are enabled, a scrambling sequence of 0 or 1 for a rank 2, and a scrambling sequence 0 for a rank 3. 
     
     
       14. The method of  claim 9 , wherein selecting the antenna port related information comprises:
 selecting the antenna port related information in a rank 1, when the codeword 0 is enabled and the codeword 1 is disabled and a current transmission is an initial transmission;   selecting the antenna port related information in all ranks, when the codeword 0 is enabled and the codeword 1 is disabled and the current transmission is a retransmission; and   selecting the antenna port related information in all the ranks for the initial transmission and the retransmission, when both the codeword 0 and the codeword 1 are enabled.   
     
     
       15. The method of  claim 9 , wherein the control information includes indication information for notifying the terminal as to whether a number of other terminals allocated at least one layer transmitted by a base station is greater than or equal to 1. 
     
     
       16. The method of  claim 9 , wherein the antenna port related information includes at least one of an index indicating a DeModulation Reference Signal (DM-RS) antenna port 0 allocated a scrambling code 0 in rank pattern 2, an index indicating a DM-RS antenna port 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna port 0 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna port 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, and 2 allocated scrambling code 0 in rank pattern 4, and a index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, when the codeword 0 is enabled and the codeword 1 is disabled, and
 at least one of an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 12 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0, 1, 2, 3, and 4 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, and 5 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, and 6 allocated scrambling code 0 in rank pattern 8, and an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, 6, and 7 allocated scrambling code 0 in rank pattern 8, when both the codeword 0 and the codeword 1 are enabled,   wherein the DM-RS antenna port 0 is a first antenna port allocated a DM-RS among all Reference Signals (RSs), and an arbitrary DM-RS antenna port n is indexed in ascending order from the DM-RS antenna port 0.   
     
     
       17. A terminal for interpreting control information received from a base station in a mobile communication system, comprising:
 a transceiver configured to receive control information including transport block information and antenna port related information; and   a controller configured to identify whether a codeword 0 is enabled and a codeword 1 is disabled, or both codeword 0 and codeword 1 are enabled based on the transport block information, for interpreting the antenna port related information according to a result of the identification.   
     
     
       18. The terminal of  claim 17 , wherein, if the codeword 0 is enabled and the codeword 1 is disabled, the antenna port related information is configured to indicate up to 4 antenna ports for 4 layers,
 wherein a reference signal (RS) for one layer includes one of a combination of 0 or 1 and a 1st antenna port or a 2nd antenna port,   wherein RSs for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port, and   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port.   
     
     
       19. The terminal of  claim 17 , wherein, if both the codeword 0 and the codeword 1 are enabled, the antenna port related information is configured to indicate up to 8 antenna ports for 8 layers,
 wherein reference signals (RSs) for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port,   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port,   wherein RSs for five layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, and a 5th antenna port,   wherein RSs for six layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, and a 6th antenna port,   wherein RSs for seven layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, and a 7th antenna port, and   wherein RSs for eight layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, the 7th antenna port, and an 8th antenna port.   
     
     
       20. The terminal of  claim 17 , wherein the antenna port related information comprises a maximum rank set to 4, and when the codeword 0 is enabled and the codeword 1 is disabled, a scrambling sequence of 0 or 1 for a rank 1 or 2, and a scrambling sequence 0 for a rank 3. 
     
     
       21. The terminal of  claim 17 , wherein the antenna port related information comprises a maximum rank set to 8, and when both the codeword 0 and the codeword 1 are enabled, a scrambling sequence of 0 or 1 for a rank 2, and a scrambling sequence 0 for a rank 3. 
     
     
       22. The terminal of  claim 17 , wherein the controller is configured to interpret the antenna port related information for a rank 1, when the codeword 0 is enabled and the codeword 1 is disabled and a current transmission is an initial transmission, interpret the antenna port related information for all ranks, when the codeword 0 is enabled and the codeword 1 is disabled and the current transmission is a retransmission, and interprets the antenna port related information for all the ranks at the initial transmission and the retransmission, when both the codeword 0 and the codeword 1 are enabled. 
     
     
       23. The terminal of  claim 17 , wherein the control information comprises indication information for notifying the terminal as to whether a number of other terminals allocated at least one layer transmitted by the base station is greater than or equal to 1. 
     
     
       24. The terminal of  claim 17 , wherein the antenna port related information comprises:
 at least one of an index indicating a DeModulation Reference Signal (DM-RS) antenna port 0 allocated a scrambling code 0 in rank pattern 2, an index indicating a DM-RS antenna port 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna port 0 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna port 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, and 2 allocated scrambling code 0 in rank pattern 4, and a index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, when the codeword 0 is enabled and the codeword 1 is disabled; and   at least one of an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1 and 2 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0, 1, 2, 3, and 4 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, and 5 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, and 6 allocated scrambling code 0 in rank pattern 8, and an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, 6, and 7 allocated scrambling code 0 in rank pattern 8, when both the codeword 0 and the codeword 1 are enabled,   wherein the DM-RS antenna port 0 is a first antenna port allocated a DM-RS among all Reference Signals (RSs), and an arbitrary DM-RS antenna port n is indexed in ascending order from the DM-RS antenna port 0.   
     
     
       25. A base station for transmitting control information in a mobile communication system, comprising:
 a controller configured to determine whether a codeword 0 is enabled and a codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled, select antenna port related information according to a result of the determination, and generate control information including transport block information indicating whether the codeword 0 is enabled and the codeword 1 is disabled, or both the codeword 0 and the codeword 1 are enabled and the antenna port related information, and   a transceiver configured to transmit the control information to the terminal.   
     
     
       26. The base station of  claim 25 , wherein, if the codeword 0 is enabled and the codeword 1 is disabled, the antenna port related information is configured to indicate up to 4 antenna ports for 4 layers,
 wherein a Reference Signal (RS) for one layer includes one of a combination of 0 or 1 and a 1st antenna port or a 2nd antenna port,   wherein RSs for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port, and   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port.   
     
     
       27. The base station of  claim 25 , wherein, if both the codeword 0 and the codeword 1 are enabled, the antenna port related information is configured to indicate up to 8 antenna ports for 8 layers,
 wherein reference signals (RSs) for two layers include the 1st antenna port and the 2nd antenna port,   wherein RSs for three layers include the 1st antenna port, the 2nd antenna port, and a 3rd antenna port,   wherein RSs for four layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, and a 4th antenna port,   wherein RSs for five layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, and a 5th antenna port,   wherein RSs for six layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, and a 6th antenna port,   wherein RSs for seven layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, and a 7th antenna port, and   wherein RSs for eight layers include the 1st antenna port, the 2nd antenna port, the 3rd antenna port, the 4th antenna port, the 5th antenna port, the 6th antenna port, the 7th antenna port, and an 8th antenna port.   
     
     
       28. The base station of  claim 25 , wherein the antenna port related information comprises a maximum rank set to 4, and when the codeword 0 is enabled and the codeword 1 is disabled, a scrambling sequence of 0 or 1 for a rank 1 or 2, and a scrambling sequence 0 for a rank 3. 
     
     
       29. The base station of  claim 25 , wherein the antenna port related information comprises a maximum rank set to 8, and when both the codeword 0 and the codeword 1 are enabled, a scrambling sequence of 0 or 1 for a rank 2, and a scrambling sequence 0 for a rank 3. 
     
     
       30. The base station of  claim 25 , wherein the controller is configured to select the antenna port related information in a rank 1, when the codeword 0 is enabled and the codeword 1 is disabled and a current transmission is an initial transmission, select the antenna port related information in all ranks, when the codeword 0 is enabled and the codeword 1 is disabled and the current transmission is a retransmission, and select the antenna port related information in all the ranks for the initial transmission and the retransmission, when both the codeword 0 and the codeword 1 are enabled. 
     
     
       31. The base station of  claim 25 , wherein the control information comprises indication information for notifying the terminal as to whether a number of other terminals allocated at least one layer transmitted by the base station is greater than or equal to 1. 
     
     
       32. The base station of  claim 25 , wherein the antenna port related information comprises:
 at least one of an index indicating a DeModulation Reference Signal (DM-RS) antenna port 0 allocated a scrambling code 0 in rank pattern 2, an index indicating a DM-RS antenna port 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna port 0 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna port 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, and 2 allocated scrambling code 0 in rank pattern 4, and a index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, when the codeword 0 is enabled and the codeword 1 is disabled; and   at least one of an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 0 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1 and 2 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0 and 1 allocated scrambling code 1 in rank pattern 2, an index indicating the DM-RS antenna ports 0, 1, 2, and 3 allocated scrambling code 0 in rank pattern 4, an index indicating the DM-RS antenna ports 0, 1, 2, 3, and 4 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, and 5 allocated scrambling code 0 in rank pattern 8, an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, and 6 allocated scrambling code 0 in rank pattern 8, and an index indicating the DM-RS antenna ports 0, 1, 2, 3, 4, 5, 6, and 7 allocated scrambling code 0 in rank pattern 8, when both the codeword 0 and the codeword 1 are enabled,   wherein the DM-RS antenna port 0 is a first antenna port allocated a DM-RS among all Reference Signals (RSs), and an arbitrary DM-RS antenna port n is indexed in ascending order from the DM-RS antenna port 0.   
     
     
       33. A method for identifying control information of a terminal in a mobile communication system, the method comprising:
 receiving, from a base station, downlink control information including first transport block information, second transport block information, and antenna port related information for a demodulation reference signal (DMRS) associated with a physical downlink shared channel, wherein the first transport block information corresponds to a first transport block and the second transport block information corresponds to a second transport block;   identifying whether the first transport block is enabled based on the first transport block information and whether the second transport block is enabled based on the second transport block information; and   identifying the antenna port related information according to a result of the identification,   wherein, for a first value of the antenna port related information, which is not a reserved value for both cases that one transport block is enabled and two transport blocks are enabled, at least one antenna port indicated by the first value in case that the two transport blocks are enabled includes at least one antenna port indicated by the first value in case that the one transport block is enabled.    
     
     
       34. The method of claim 33, wherein the antenna port related information is associated with a rank pattern, and
 wherein the rank pattern is information for a number of resource elements (REs) configured to be used for a code division multiplexing (CDM) of DMRSs.    
     
     
       35. The method of claim 34, wherein up to 4 DMRSs are CDMed on one RE set.  
     
     
       36. The method of claim 35, wherein at least a part of the DMRSs on the one RE set is not allocated for the terminal. 
     
     
       37. The method of claim 33, wherein the DMRS associated with an antenna port indicated by the antenna port related information is identified based on a sequence index 0 or 1 indicated by the downlink control information.  
     
     
       38. A method for transmitting control information of a base station in a mobile communication system, the method comprising:
 identifying whether a first transport block is enabled and a second transport block is enabled;   identifying first transport block information, second transport block information, and antenna port related information for a demodulation reference signal (DMRS) associated with a physical downlink shared channel based on the identification, wherein the first transport block information corresponds to the first transport block and the second transport block information corresponds to the second transport block; and   transmitting, to a terminal, downlink control information including the first transport block information, the second transport block information, and the antenna port related information for the DMRS associated with the physical downlink shared channel,   wherein, for a first value of the antenna port related information, which is not a reserved value for both cases that one transport block is enabled and two transport blocks are enabled, at least one antenna port indicated by the first value in case that the two transport blocks are enabled includes at least one antenna port indicated by the first value in case that the one transport block is enabled.    
     
     
       39. The method of claim 38, wherein the antenna port related information is associated with a rank pattern, and
 wherein the rank pattern is information for a number of resource elements (REs) configured to be used for a code division multiplexing (CDM) of DMRSs.    
     
     
       40. The method of claim 39, wherein up to 4 DMRSs are CDMed on one RE set. 
     
     
       41. The method of claim 40, wherein at least a part of the DMRSs on the one RE set is not allocated for the terminal.  
     
     
       42. The method of claim 38, wherein the DMRS associated with an antenna port indicated by the antenna port related information is identified based on a sequence index 0 or 1 indicated by the downlink control information.  
     
     
       43. A terminal for identifying control information in a mobile communication system, the terminal comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to:
 receive, from a base station, downlink control information including first transport block information, second transport block information, and antenna port related information for a demodulation reference signal (DMRS) associated with a physical downlink shared channel, wherein the first transport block information corresponds to a first transport block and the second transport block information corresponds to a second transport block, 
 identify whether the first transport block is enabled based on the first transport block information and whether the second transport block is enabled based on the second transport block information, and 
 identify the antenna port related information according to a result of the identification, 
   wherein, for a first value of the antenna port related information, which is not a reserved value for both cases that one transport block is enabled and two transport blocks are enabled, at least one antenna port indicated by the first value in case that the two transport blocks are enabled includes at least one antenna port indicated by the first value in case that the one transport block is enabled.   
     
     
       44. The terminal of claim 43, the antenna port related information is associated with a rank pattern, and
 wherein the rank pattern is information for a number of resource elements (REs) configured to be used for a code division multiplexing (CDM) of DMRSs.    
     
     
       45. The terminal of claim 44, wherein up to 4 DMRSs are CDMed on one RE set.  
     
     
       46. The terminal of claim 43, wherein at least a part of the DMRSs on the one RE set is not allocated for the terminal.  
     
     
       47. The terminal of claim 43, wherein the DMRS associated with an antenna port indicated by the antenna port related information is identified based on a sequence index 0 or 1 indicated by the downlink control information.  
     
     
       48. A base station for transmitting control information in a mobile communication system, the base station comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to:
 identify whether a first transport block is enabled and a second transport block is enabled, 
 identify first transport block information, second transport block information and antenna port related information for a demodulation reference signal (DMRS) associated with a physical downlink shared channel based on the identification, wherein the first transport block information corresponds to the first transport block and the second transport block information corresponds to the second transport block, and 
 transmit, to a terminal, downlink control information including the first transport block information, the second transport block information, and the antenna port related information, 
   wherein, for a first value of the antenna port related information, which is not a reserved value for both cases that one transport block is enabled and two transport blocks are enabled, at least one antenna port indicated by the first value in case that the two transport blocks are enabled includes at least one antenna port indicated by the first value in case that the one transport block is enabled.    
     
     
       49. The base station of claim 48, wherein the antenna port related information is associated with a rank pattern, and
 wherein the rank pattern is information for a number of resource elements (REs) configured to be used for a code division multiplexing (CDM) of DMRSs.    
     
     
       50. The base station of claim 49, wherein up to 4 DMRSs are CDMed on one RE set.  
     
     
       51. The base station of claim 50, wherein at least a part of the DMRSs on the one RE set is not allocated for the terminal.  
     
     
       52. The base station of claim 48, wherein the DMRS associated with an antenna port indicated by the antenna port related information is identified based on a sequence index 0 or 1 indicated by the downlink control information.