Communication system, communication device, and data frame retransmission control method

Abstract

A mobile station device ( 12 ) includes a retransmission request transmission timing identifying unit ( 40 ) which identifies, based on a timing of reception of a data frame transmitted from a base station device, a timing of transmission of a retransmission request of the data frame to the base station device. The base station device includes a retransmission data frame selecting unit which selects, based on a timing of reception of the retransmission request transmitted from the mobile station device ( 12 ), a data frame to be retransmitted from among a plurality of data frames transmitted to the mobile station device ( 12 ), and retransmits a data frame selected by the retransmission data frame selecting unit to the mobile station device ( 12 ).

1 . A communication system having a transmitting device and a receiving device which employ an automatic repeat request method of a data frame, wherein
 the receiving device comprises retransmission request transmission timing identifying means for identifying, based on a timing of reception of a data frame transmitted from the transmitting device, a timing of transmission of a retransmission request of the data frame to the transmitting device,
 the transmitting device comprises retransmission data frame selecting means for selecting, based on a timing of reception of the retransmission request transmitted from the receiving device, a data frame to be retransmitted from among a plurality of data frames transmitted to the receiving device, and retransmits the data frame selected by the retransmission data frame selecting means to the receiving device. 
   
     
     
         2 . The communication system according to  claim 1 , wherein
 the transmitting device further comprises transmitted data frame storage means for storing at least some of the plurality of data frames transmitted to the receiving device in a manner to allow identification of a timing of transmission of each of the data frames, and   the retransmission data frame selecting means identifies a timing of transmission of the data frame to be retransmitted based on the timing of reception of the retransmission request and selects the data frame to be retransmitted from the transmitted data frame storage means based on the identified timing.   
     
     
         3 . The communication system according to  claim 1 , wherein
 the communication system further employs a time division multiplex communication system, and   the timing is identified by a time slot or a time frame according to time division multiplexing.   
     
     
         4 . A receiving device which receives a data frame transmitted from a transmitting device and which transmits, upon detection of an error in the received data frame, a retransmission request of the data frame to the transmitting device, the receiving device comprising:
 retransmission request transmission timing identifying means for identifying, based on a timing of reception of the data frame, a timing of transmission of the retransmission request of the data frame.   
     
     
         5 . A transmitting device which transmits a data frame to a receiving device and which retransmits, in response to a retransmission request from the receiving device, a data frame corresponding to the retransmission request, the transmitting device comprising:
 retransmission data frame selecting means for selecting, based on a timing of reception of the retransmission request, a data frame to be retransmitted from among a plurality of data frames transmitted to the receiving device, and retransmits a data frame selected by the retransmission data frame selecting means to the receiving device.   
     
     
         6 . A data frame retransmission control method in a communication system having a transmitting device and a receiving device, the data frame retransmission control method comprising:
 a retransmission request transmission timing identifying step of identifying, based on a timing at which the receiving device receives a data frame transmitted from the transmitting device, a timing of transmission of a retransmission request of the data frame to the transmitting device, and   a retransmission data frame selecting step of selecting, based on a timing at which the transmitting device receives the retransmission request, a data frame to be retransmitted from among a plurality of data frames transmitted to the receiving device.   
     
     
         7 . A communication device which communicates with another communication device according to a time division duplex system and which retransmits, in response to a retransmission request transmitted from the other communication device, a data frame corresponding to the retransmission request to the other communication device, the communication device comprising:
 data frame retransmission timing determining means for determining a retransmission timing of the data frame based on a reception timing of the retransmission request so that a timing difference between the reception timing of the retransmission request and the retransmission timing of the data frame corresponding to the retransmission request is close to a reference required time required from reception of a retransmission request to retransmission of a data frame.   
     
     
         8 . The communication device according to  claim 7 , further comprising:
 timing difference information storage means for storing, in correlation to information indicating a reception timing of a retransmission request, timing difference information indicating a timing difference which satisfies a condition related to the reference required time, wherein   the data frame retransmission timing determining means reads timing difference information from the timing difference information storage means in correlation to the reception timing of the retransmission request and determines the retransmission timing of the data frame based on the reception timing of the retransmission request and the read timing difference information.   
     
     
         9 . A communication device which communicates with another communication device according to a time division duplex system and which retransmits, in response to a retransmission request transmitted from the other communication device, a data frame corresponding to the retransmission request to the other communication device, the communication device comprising:
 data frame retransmission timing determining means for determining a retransmission timing of the data frame based on a processing capability of the communication device so that a timing difference between a reception timing of the retransmission request and the retransmission timing of the data frame corresponding to the retransmission request is close to a reference required time required from reception of a retransmission request to retransmission of a data frame.   
     
     
         10 . The communication device according to  claim 9 , wherein
 the data frame retransmission timing determining means determines the retransmission timing of the data frame further based on the reception timing of the retransmission request.   
     
     
         11 . The communication device according to  claim 10 , further comprising:
 timing difference information storage means for storing, in correlation to information indicating a processing capability of a communication device and information indicating a reception timing of a retransmission request, timing difference information indicating a timing difference which satisfies a condition related to the reference required time, wherein   the data frame retransmission timing determining means reads the timing difference information from the timing difference information storage means in correlation to the processing capability of the communication device and the reception timing of the retransmission request and determines the retransmission timing based on the reception timing of the retransmission request and the read timing difference information.   
     
     
         12 . The communication device according to  claim 7 , wherein
 the reception timing is identified by a reception slot, and   the retransmission timing is identified by a transmission slot or a transmission frame including the transmission slot.   
     
     
         13 . A data frame retransmission method in which a data frame is retransmitted in response to a retransmission request in a communication according to a time division duplex system, the data frame retransmission method comprising:
 a step of determining a retransmission timing of the data frame based on a reception timing of the retransmission request so that a timing difference between the reception timing of the retransmission request and the retransmission timing of the data frame corresponding to the retransmission request is close to a reference required time required from reception of a retransmission request to retransmission of a data frame.   
     
     
         14 . A data frame retransmission method in which a data frame is retransmitted in response to a retransmission request in a communication according to a time division duplex system, the data frame retransmission method comprising:
 a step of determining a retransmission timing of the data frame based on a processing capability of the communication device so that a timing difference between a reception timing of the retransmission request and the retransmission timing of the data frame corresponding to the retransmission request is close to a reference required time required from reception of a retransmission request to retransmission of a data frame.   
     
     
         15 . The communication system according to  claim 2 , wherein
 the communication system further employs a time division multiplex communication system, and   the timing is identified by a time slot or a time frame according to time division multiplexing.   
     
     
         16 . The communication device according to  claim 8 , wherein
 the reception timing is identified by a reception slot, and   the retransmission timing is identified by a transmission slot or a transmission frame including the transmission slot.   
     
     
         17 . The communication device according to  claim 9 , wherein
 the reception timing is identified by a reception slot, and   the retransmission timing is identified by a transmission slot or a transmission frame including the transmission slot.   
     
     
         18 . The communication device according to  claim 10 , wherein
 the reception timing is identified by a reception slot, and   the retransmission timing is identified by a transmission slot or a transmission frame including the transmission slot.   
     
     
         19 . The communication device according to  claim 11 , wherein
 the reception timing is identified by a reception slot, and   the retransmission timing is identified by a transmission slot or a transmission frame including the transmission slot.