Base station device, mobile station device, wireless communication method, wireless communication system, and integrated circuit

Abstract

A base station device that communicates with a mobile station device is provided. The base station device uses a physical broadcast channel to transmit information instructing the mobile station device to monitor a common search space or an enhanced common search space for a physical downlink channel.

1 - 34 . (canceled) 
     
     
         35 . A base station device that communicates with a mobile station device, wherein
 the base station device uses a physical broadcast channel to transmit information instructing the mobile station device to monitor a common search space or an enhanced common search space for a physical downlink channel.   
     
     
         36 . The base station device according to  claim 35 , wherein
 the base station device transmits the physical broadcast channel with 0th to 3rd OFDM symbols in a second slot of a 0th subframe in respective radio frames in the time domain, and with the central 72 downlink subcarriers of a cell in the frequency domain.   
     
     
         37 . The base station device according to  claim 35 , wherein
 the base station device transmits a physical downlink control channel in the common search space,   the base station device transmits an enhanced physical downlink control channel in the enhanced common search space,   the physical downlink control channel is time-multiplexed with a physical downlink shared channel, and   the enhanced physical downlink control channel is frequency-multiplexed with the physical downlink shared channel.   
     
     
         38 . The base station device according to  claim 37 , wherein
 in a case in which the physical downlink control channel is not placed in the cell used to communicate with the mobile station device, the base station device instructs the mobile station device to monitor the enhanced common search space for the enhanced physical downlink control channel with the information.   
     
     
         39 . The base station device according to  claim 37 , wherein
 in a case in which the physical downlink control channel and the enhanced physical downlink control channel are placed in the cell used to communicate with the mobile station device, the base station device instructs the mobile station device to monitor the common search space for the physical downlink control channel with the information.   
     
     
         40 . The base station device according to  claim 35 , wherein
 the base station device uses a physical downlink shared channel to transmit a system information block which is common for a plurality of the mobile station device and which includes information related to configuration of an enhanced mobile station device-specific search space.   
     
     
         41 . The base station device according to  claim 40 , wherein
 the base station device uses the physical downlink shared channel to transmit dedicated radio resource control information for the mobile station device, including information related to configuration of the enhanced mobile station device-specific search space.   
     
     
         42 . The base station device according to  claim 41 , wherein
 until transmitting the dedicated radio resource control information to the mobile station device, the base station device, on the basis of information related to configuration of the enhanced mobile station device-specific search space included in the system information block, transmits an enhanced physical downlink control channel targeting the mobile station device in the enhanced mobile station device-specific search space configured by the mobile station device.   
     
     
         43 . A mobile station device that communicates with a base station device, wherein
 the mobile station device uses a physical broadcast channel to receive information instructing the mobile station device to monitor a common search space or an enhanced common search space for a physical downlink channel, and   on the basis of the information, the mobile station device monitors the common search space or the enhanced common search space for the physical downlink channel.   
     
     
         44 . The mobile station device according to  claim 43 , wherein
 the physical broadcast channel is transmitted with 0th to 3rd OFDM symbols in a second slot of a 0th subframe in respective radio frames in the time domain, and with the central 72 downlink subcarriers of a cell in the frequency domain.   
     
     
         45 . The mobile station device according to  claim 43 , wherein
 the mobile station device receives a physical downlink control channel in the common search space, and receives an enhanced physical downlink control channel in the enhanced common search space,   the physical downlink control channel is time-multiplexed with a physical downlink shared channel, and   the enhanced physical downlink control channel is frequency-multiplexed with the physical downlink shared channel.   
     
     
         46 . The mobile station device according to  claim 43 , wherein
 the mobile station device uses a physical downlink shared channel to receive a system information block common for a plurality of the mobile station device, and   the system information block includes information related to configuration of an enhanced mobile station device-specific search space.   
     
     
         47 . The mobile station device according to  claim 46 , wherein
 the mobile station device uses the physical downlink shared channel to receive dedicated radio resource control information for the mobile station device, and   the dedicated radio resource control information includes information related to configuration of the enhanced mobile station device-specific search space.   
     
     
         48 . The mobile station device according to  claim 47 , wherein
 until receiving the dedicated radio resource control information from the base station device, the mobile station device monitors the enhanced mobile station device-specific search space configured on the basis of information related to configuration of the enhanced mobile station device-specific search space included in the system information block for an enhanced physical downlink control channel targeting the device itself.   
     
     
         49 . The mobile station device according to  claim 48 , wherein
 in a case in which the enhanced mobile station device-specific search space is configured on the basis of information related to configuration of the enhanced mobile station device-specific search space included in the dedicated radio resource control information,   the mobile station device does not configure the enhanced mobile station device-specific search space on the basis of information related to configuration of the enhanced mobile station device-specific search space included in a subsequently received system information block.   
     
     
         50 . A wireless communication method used by a base station device that communicates with a mobile station device, comprising:
 using a physical broadcast channel to transmit information instructing the mobile station device to monitor a common search space or an enhanced common search space for a physical downlink channel.   
     
     
         51 . The wireless communication method according to  claim 50 , further comprising:
 using a physical downlink shared channel to transmit a system information block which is common for a plurality of the mobile station device, and which includes information related to configuration of an enhanced mobile station device-specific search space.   
     
     
         52 . A wireless communication method used by a mobile station device that communicates with a base station device, comprising:
 using a physical broadcast channel to receive information instructing the mobile station device to monitor a common search space or an enhanced common search space for a physical downlink channel; and   on the basis of the information, monitoring the common search space or the enhanced common search space for the physical downlink channel.   
     
     
         53 . The wireless communication method according to  claim 52 , further comprising:
 using a physical downlink shared channel to receive a system information block common for a plurality of the mobile station device;   
       wherein the system information block includes information related to configuration of an enhanced mobile station device-specific search space.