Method and apparatus for transmitting downlink control channel information in carrier aggregation system

Abstract

A method for transmitting control information by a base station in a communication system using a plurality of serving cells comprises transmitting is provided. The method includes a terminal, an identifier of a second serving cell identifying where control information regarding a first serving cell is transmitted, transmitting, to the terminal, a predetermined value of a carrier identifier used in the second serving cell, and transmitting the control information regarding the first serving cell including the carrier identifier having the predetermined value through the second serving cell.

What is claimed is: 
     
         1 . A method for transmitting control information by a base station in a communication system using a plurality of serving cells, the method comprising:
 transmitting, to a terminal, an identifier of a second serving cell identifying where control information regarding a first serving cell is transmitted;   transmitting, to the terminal, a predetermined value of a carrier identifier used in the second serving cell; and   transmitting the control information regarding the first serving cell including the carrier identifier having the predetermined value through the second serving cell.   
     
     
         2 . The method of  claim 1 , wherein the identifier of the second serving cell and the predetermined value of the carrier identifier are transmitted using higher layer information. 
     
     
         3 . The method of  claim 1 , wherein the second serving cell is included in a same serving cell group as the first serving cell. 
     
     
         4 . The method of  claim 3 , wherein the serving cell group is implicitly or explicitly configured in the terminal. 
     
     
         5 . The method of  claim 1 , wherein the control information is downlink assignment information or uplink assignment information. 
     
     
         6 . A base station for transmitting control information in a communication system using a plurality of serving cells, the base station comprising:
 a controller configured to:
 generate an identifier of a second serving cell identifying where control information regarding a first serving cell is transmitted and a predetermined value of a carrier identifier used in the second serving cell, and 
 generate the control information regarding the first serving cell including the carrier identifier having the predetermined value; and 
   a transmitter configured to transmit the identifier of the second serving cell, the predetermined value of the carrier identifier, and the control information regarding the first serving cell to a terminal through the second serving cell.   
     
     
         7 . The base station of  claim 6 , wherein the identifier of the second serving cell and the predetermined value of the carrier identifier are transmitted using higher layer information. 
     
     
         8 . The base station of  claim 6 , wherein the second serving cell is included in a same serving cell group as the first serving cell. 
     
     
         9 . The base station of  claim 8 , wherein the serving cell group is implicitly or explicitly configured in the terminal. 
     
     
         10 . The base station of  claim 6 , wherein the control information is downlink assignment information or uplink assignment information. 
     
     
         11 . A method for transmitting a measurement result by a terminal in a wireless communication system, the method comprising:
 when control information including measurement results of one or more neighbor cells is to be transmitted, determining whether the control information is a measurement result reporting message or a secondary cell group (SCG) failure message;   when the control information is the SCG failure message, selecting a best measurement result of measurement results of serving frequencies for SCG serving cells and serving frequencies configured in the terminal, and selecting a predetermined number of best measurement results of measurement results of all non-serving frequencies configured in the terminal;   generating the SCG failure message including the selected measurement results; and   transmitting the generated SCG failure message to a base station.   
     
     
         12 . The method of  claim 11 , wherein the SCG failure message further includes identifiers of all the non-serving frequencies. 
     
     
         13 . A terminal for transmitting a measurement result in a wireless communication system, the terminal comprising:
 a controller configured to:
 when control information including measurement results of one or more neighbor cells is to be transmitted, determine whether the control information is a measurement result reporting message or a secondary cell group (SCG) failure message, and 
 when the control information is the SCG failure message, select a best measurement result of measurement results of serving frequencies for SCG serving cells and serving frequencies configured in the terminal, and select a predetermined number of best measurement results of measurement results of all non-serving frequencies configured in the terminal; 
   a control message processor configured to generate the SCG failure message including the selected measurement results; and   a transceiver configured to transmit the generated SCG failure message to a base station.   
     
     
         14 . The terminal of  claim 13 , wherein the SCG failure message further includes identifiers of all the non-serving frequencies. 
     
     
         15 . A method for transmitting control information by a terminal in a wireless communication system, the method comprising:
 detecting interference with a positioning signal received by the terminal or detecting interference with a positioning signal to be received by the terminal;   determining whether the positioning signal is related to an emergency call;   when the positioning signal is not related to the emergency call, determining whether transmission of an inter-device coexistence (IDC) message is configured in the terminal;   when the transmission of the IDC message is configured in the terminal, and the IDC message may be transmitted, generating an IDC message including first information related to the interference with the positioning signal; and   transmitting the generated IDC message to a base station.   
     
     
         16 . The method of  claim 15 , wherein the first information includes information indicating that cellular uplink transmission in the terminal may interfere with reception of the positioning signal, frequency information regarding the uplink transmission interfering with the reception of the positioning signal, and frequency information regarding the positioning signal. 
     
     
         17 . The method of  claim 15 , further comprising:
 when the positioning signal is related to the emergency call, generating an IDC message including the first information and information indicating that the positioning signal is related to the emergency call; and   transmitting the generated IDC message to the base station.   
     
     
         18 . The method of  claim 15 , wherein, when the positioning signal is not related to the emergency call, the generated IDC message is transmitted once, and when the positioning signal is related to the emergency call, the generated IDC message is repeatedly transmitted. 
     
     
         19 . The method of  claim 15 , further comprising, upon generation of at least two downlink transmissions affecting reception of the positioning signal related to the emergency call, disregarding the other downlink transmissions except one with a higher priority of the at least two downlink transmissions depending on a predetermined priority. 
     
     
         20 . A terminal for transmitting control information in a wireless communication system, the terminal comprising:
 a controller configured to:
 detect interference with a positioning signal received by the terminal or detecting interference with a positioning signal to be received by the terminal, 
 determine whether the positioning signal is related to an emergency call, 
 when the positioning signal is not related to the emergency call, determine whether transmission of an IDC message is configured in the terminal, and 
 when the transmission of the IDC message is configured in the terminal, and the IDC message may be transmitted, generate an IDC message including first information related to the interference with the positioning signal; and 
   a transceiver configured to transmit the generated IDC message to a base station.   
     
     
         21 . The terminal of  claim 20 , wherein the first information includes information indicating that cellular uplink transmission in the terminal may interfere with reception of the positioning signal, frequency information regarding the uplink transmission interfering with the reception of the positioning signal, and frequency information regarding the positioning signal. 
     
     
         22 . The terminal of  claim 20 ,
 wherein, when the positioning signal is related to the emergency call, the controller is further configured to generate an IDC message including the first information and information indicating that the positioning signal is related to the emergency call; and   wherein the transceiver is further configured to transmit the generated IDC message to the base station.   
     
     
         23 . The terminal of  claim 20 , wherein, when the positioning signal is not related to the emergency call, the generated IDC message is transmitted once, and when the positioning signal is related to the emergency call, the generated IDC message is repeatedly transmitted. 
     
     
         24 . The terminal of  claim 20 , wherein, upon generation of at least two downlink transmissions affecting reception of the positioning signal related to the emergency call, the controller is further configured to disregard the other downlink transmissions except one with a higher priority of the at least two downlink transmissions depending on a predetermined priority.