Terminal device, base station device, and communication method

Abstract

A terminal device includes: a control unit configured to set one or more second TTI settings in accordance with control information from the base station device; and a receiving unit configured to monitor a first PDCCH corresponding to a first TTI and a second PDCCH corresponding to a second TTI of a time length shorter than the first TTI and receive a second PDSCH mapped to the second TTI in a case in which the second TTI settings are set, and monitor the first PDCCH and receive a first PDSCH mapped to the first TTI in a case in which the second TTI settings are not set.

1 . A communication device that performs side link communication with an other terminal device, comprising:
 circuitry configured to
 set resources used for the side link communication based on control information of a upper layer of a protocol, 
 receive first control information and second control information transmitted in resources of a time-frequency region of a shared communication channel, the second control information and the first control information being transmitted over the shared channel in which communications are scheduled with scheduling information based on the first control information and the second control information transmitted from the other communication device, 
   wherein the first control information includes at least a portion of the second control information and the scheduling information for the shared channel, and the second control information includes at least a portion of the scheduling information for the shared channel.   
     
     
         2 . The communication device according to  claim 1 , wherein
 the first control information is transmitted on a control channel, and the second control information is transmitted on a channel different from the control channel.   
     
     
         3 . The communication device according to  claim 1 , wherein
 the first control information and the second control information provide input to schedule a plurality of types of communication over the shared channel, and   the second control information includes information that identifies the shared channel as a particular type of communication channel.   
     
     
         4 . A communication device that performs side link communication with an other terminal device, comprising:
 circuitry configured to
 set the resources used for the side link communication based on control information of an upper layer of a protocol, 
 transmit, via a transmitter, to the other terminal device, using at least one of the resources, first control information and second control information over a shared channel, wherein transmissions over the shared channel are scheduled based on the first control information and the second control information, wherein 
   wherein the first control information includes at least a portion of the second control information and the scheduling information for the shared channel, and the second control information includes at least a portion of the scheduling information for the shared channel.