Base station device, mobile station device, program, uplink synchronization requesting method, and synchronization-shift measurement signal transmitting method

Abstract

A mobile station device that receives control information having a downlink control information format and addressed by a Cell-Radio Network Temporary Identifier on a physical downlink control channel from a base station device. The mobile station device also transmits a random access preamble using a random access channel to the base station device based on receiving the control information which provides a random access order. The downlink control information format includes a first field for downlink resource assignment. In a first case that the downlink control information form at is used for the random access order, a fixed value is set to the first field, while in a second case in which the downlink control information format is used for downlink scheduling, a first value different from the fixed value is set to the first field.

What is claimed: 
     
         1 . A mobile station device included in a mobile communication system, the mobile station device comprising:
 a receiver configured to receive control information having a downlink control information format and being addressed by a Cell-Radio Network Temporary Identifier (C-RNTI) to the mobile station device, on a physical downlink control channel from a base station device; and   a transmitter configured to transmit a random access preamble using a random access channel to the base station device based on receiving the control information which provides a random access order, wherein   the downlink control information format includes a first field to be used for downlink resource assignment,   in a first case that the downlink control information format is used for the random access order, a fixed value is set to the first field,   in a second case that the downlink control information format is used for downlink scheduling, a first value is set to the first field, and   the fixed value is different from the first value.   
     
     
         2 . The mobile station device according to  claim 1 , wherein in the second case, a second value specifying the random access preamble is set to the downlink control information format. 
     
     
         3 . The mobile station device according to  claim 2 , wherein in the second case, a third value specifying a region on a radio frame available for random access is set to the downlink control information format. 
     
     
         4 . A base station device included in a mobile communication system, the base station device comprising:
 a transmitter configured to transmit control information having a downlink control information format and being addressed by a Cell-Radio Network Temporary Identifier (C-RNTI) to a mobile station device, on a physical downlink control channel to the mobile station device; and   a receiver configured to receive a random access preamble using a random access channel from the mobile station device based on receiving the downlink control information which provides a random access order, wherein   the downlink control information format includes a first field to be used for downlink resource assignment,   in a first case that the downlink control information format is used for the random access order, a fixed value is set to the first field,   in a second case that the downlink control information format is used for downlink scheduling, a first value is set to the first field, and   the fixed value is different from the first value.   
     
     
         5 . The base station device according to  claim 4 , wherein in the second case, a second value specifying the random access preamble is set to the downlink control information format. 
     
     
         6 . The base station device according to  claim 5 , wherein in the second case, a third value specifying a region on a radio frame available for random access is set to the downlink control information format. 
     
     
         7 . A processing method for a mobile station device included in a mobile communication system, the processing method comprising:
 receiving control information having a downlink control information format and being addressed by a Cell-Radio Network Temporary Identifier (C-RNTI) to the mobile station device, on a physical downlink control channel from a base station device; and   transmitting a random access preamble using a random access channel to the base station device based on receiving the control information which provides a random access order, wherein   the downlink control information format includes a first field to be used for downlink resource assignment,   in a first case that the downlink control information format is used for the random access order, a fixed value is set to the first field,   in a second case that the downlink control information format is used for downlink scheduling, a first value is set to the first field, and   the fixed value is different from the first value.   
     
     
         8 . The processing method according to  claim 7 , wherein in the second case, a second value specifying the random access preamble is set to the downlink control information format. 
     
     
         9 . The processing method according to  claim 8 , wherein in the second case, a third value specifying a region on a radio frame available for random access is set to the downlink control information format. 
     
     
         10 . A processing method for a base station device included in a mobile communication system, the processing method comprising:
 transmitting control information having a downlink control information format and being addressed by a Cell-Radio Network Temporary Identifier (C-RNTI) to a mobile station device, on a physical downlink control channel to the mobile station device; and   receiving a random access preamble using a random access channel from the mobile station device based on receiving the downlink control information which provides a random access order, wherein   the downlink control information format includes a first field to be used for downlink resource assignment,   in a first case that the downlink control information format is used for the random access order, a fixed value is set to the first field,   in a second case that the downlink control information format is used for downlink scheduling, a first value is set to the first field, and   the fixed value is different from the first value.   
     
     
         11 . The processing method according to  claim 10 , wherein in the second case, a second value specifying the random access preamble is set to the downlink control information format. 
     
     
         12 . The base station device according to  claim 11 , wherein in the second case, a third value specifying a region on a radio frame available for random access is set to the downlink control information format.