| CPC H04L 5/0053 (2013.01) [H04L 5/0094 (2013.01)] | 13 Claims |
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1. A terminal device comprising circuitry configured to:
acquire, from a base station device:
first control information relating to one or more grant-free resources, specified by a frequency and time for the terminal device wherein the first control information is acquired by the terminal device using Radio Resource Control (RRC) signaling; and
second control information including slot format information for Time Division Duplexing (TDD), wherein the slot format information indicates information about which period is set for downlink and which period is set for uplink in a slot,
determine the one or more grant-free resources for a grant-free transmission based on the first control information;
determine, based on the second control information, whether the selected one or more grant-free resources is available for the grant-free transmission; and
transmit data as the grant-free transmission using the selected one or more grant-free resources only after the selected one or more grant-free resources is determined to be available for the grant-free transmission,
wherein the determination whether the selected one or more grant-free resources is available for the grant-free transmission includes a determination of appropriate timing for the grant-free transmission using the one or more grant-free resources,
wherein the determination of the appropriate timing includes:
on condition that the slot format information indicates downlink only, the grant-free transmission is not performed,
on condition that the slot format information indicates uplink only, the grant-free transmission is performed, and
on condition that the slot format information indicates both downlink and uplink being mixed, the grant-free transmission is performed only at uplink timing,
wherein the grant-free transmission is further controlled not to be performed in a section corresponding to symbols where NR-SS (New Radio Synchronization Signal) and a broadcast channel are transmitted,
wherein the NR-SS comprises a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), and
wherein the broadcast channel carries master information.
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