Radio station, radio terminal apparatus, and method for these

Abstract

A radio station (3) allocates a first plurality of time-frequency resources (430) and a second plurality of time-frequency resources (530) to at least one radio terminal (1, 2). The first plurality of time-frequency resources (430) are used to transmit or receive a first transport block (460) in accordance with a first transmission time interval (TTI). The first TTI is equal to a duration of one subframe (410, 510). The second plurality of time-frequency resources (530) are used to transmit or receive a second transport block (560) in accordance with a second TTI. The second TTI is shorter than the duration of the subframe (410, 510).

1 . A radio station comprising:
 at least one radio transceiver; and   at least one processor coupled to the at least one radio transceiver,   wherein the at least one radio transceiver is configured to:   transmit uplink grant information in last 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols of a first subframe, the uplink grant information providing resource allocation in a latter slot of a second subframe following the first subframe; and   receive, based on the resource allocation, Physical Uplink Shared Channel (PUSCH) by one or more OFDM symbols in the latter slot of the second subframe following the first subframe.   
     
     
         2 . The radio station according to  claim 1 , wherein
 the subframe is composed of a plurality of time slots, and   each of the plurality of time slots includes a plurality of time-frequency resources.   
     
     
         3 . The radio station according to  claim 1 , wherein
 the at least one processor is configured to allocate a plurality of time-frequency resources to at least one radio terminal,   the plurality of time-frequency resources are used to transmit or receive a transport block in accordance with a transmission time interval (TTI),   the TTI is shorter than the duration of one subframe and corresponds with an integer multiple of an OFDM symbol, and   a duration of the plurality of time-frequency resources is shorter than the duration of the subframe.   
     
     
         4 . The radio station according to  claim 3 , wherein
 the whole of the transport block is used to calculate error detection bits, and the error detection bits are added to the transport block,   the plurality of time-frequency resources are used to transmit the transport block and the error detection bits added thereto.   
     
     
         5 . The radio station according to  claim 3 , wherein the transport block is a transport block of an Uplink Shared channel (UL-SCH) or a Downlink Shared channel (DL-SCH) used to transmit a user data packet. 
     
     
         6 . A radio terminal comprising:
 at least one radio transceiver; and   at least one processor coupled to the at least one radio transceiver,   wherein the at least one radio transceiver is configured to:   receive uplink grant information in last 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols of a first subframe, the uplink grant information providing resource allocation in a latter slot of a second subframe following the first subframe; and   transmit, based on the resource allocation, Physical Uplink Shared Channel (PUSCH) by one or more OFDM symbols in the latter slot of the second subframe following the first subframe.   
     
     
         7 . The radio terminal according to  claim 6 , wherein
 the subframe is composed of a plurality of time slots, and   each of the plurality of time slots includes a plurality of time-frequency resources.   
     
     
         8 . The radio terminal according to  claim 6 , wherein
 the at least one radio transceiver is configured to transmit or receive a transport block in accordance with a transmission time interval (TTI),   the TTI is shorter than the duration of one subframe and corresponds with an integer multiple of an OFDM symbol,   the transport block is transmitted using a plurality of time-frequency resources in the subframe, and   a duration of the plurality of time-frequency resources is shorter than the duration of the subframe.   
     
     
         9 . The radio terminal according to  claim 8 , wherein
 the whole of the transport block is used to calculate error detection bits, and the error detection bits are added to the transport block,   the plurality of time-frequency resources are used to transmit the transport block and the error detection bits added thereto.   
     
     
         10 . The radio terminal according to  claim 8 , wherein the transport block is a transport block of an Uplink Shared channel (UL-SCH) or a Downlink Shared channel (DL-SCH) used to transmit a user data packet. 
     
     
         11 . A communication method for radio station, the communication method comprising:
 transmitting uplink grant information in last 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols of a first subframe, the uplink grant information providing resource allocation in a latter slot of a second subframe following the first subframe; and   receiving, based on the resource allocation, Physical Uplink Shared Channel (PUSCH) by one or more OFDM symbols in the latter slot of the second subframe following the first subframe.   
     
     
         12 . The communication method according to  claim 11 , wherein
 the subframe is composed of a plurality of time slots, and   each of the plurality of time slots includes a plurality of time-frequency resources.   
     
     
         13 . The communication method according to  claim 11 , the communication method further comprising allocating a plurality of time-frequency resources to at least one radio terminal, wherein
 the plurality of time-frequency resources are used to transmit or receive a transport block in accordance with a transmission time interval (TTI),   the TTI is shorter than the duration of one subframe and corresponds with an integer multiple of an OFDM symbol, and   a duration of the plurality of time-frequency resources is shorter than the duration of the subframe.   
     
     
         14 . The communication method according to  claim 13 , wherein
 the whole of the transport block is used to calculate error detection bits, and the error detection bits are added to the transport block,   the plurality of time-frequency resources are used to transmit the transport block and the error detection bits added thereto.   
     
     
         15 . The communication method according to  claim 13 , wherein the transport block is a transport block of an Uplink Shared channel (UL-SCH) or a Downlink Shared channel (DL-SCH) used to transmit a user data packet. 
     
     
         16 . A communication method for radio terminal, the communication method comprising:
 receiving uplink grant information in last 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols of a first subframe, the uplink grant information providing resource allocation in a latter slot of a second subframe following the first subframe; and   transmitting, based on the resource allocation, Physical Uplink Shared Channel (PUSCH) by one or more OFDM symbols in the latter slot of the second subframe following the first subframe.   
     
     
         17 . The communication method according to  claim 16 , wherein
 the subframe is composed of a plurality of time slots, and   each of the plurality of time slots includes a plurality of time-frequency resources.   
     
     
         18 . The communication method according to  claim 16 , the communication method further comprising transmitting or receiving a transport block in accordance with a transmission time interval (TTI), wherein
 the TTI is shorter than the duration of one subframe and corresponds with an integer multiple of an OFDM symbol,   the transport block is transmitted using a plurality of time-frequency resources in the subframe, and   a duration of the plurality of time-frequency resources is shorter than the duration of the subframe.   
     
     
         19 . The communication method according to  claim 18 , wherein
 the whole of the transport block is used to calculate error detection bits, and the error detection bits are added to the transport block,   the plurality of time-frequency resources are used to transmit the transport block and the error detection bits added thereto.   
     
     
         20 . The communication method according to  claim 18 , wherein the transport block is a transport block of an Uplink Shared channel (UL-SCH) or a Downlink Shared channel (DL-SCH) used to transmit a user data packet.