US Patent No. 10,893,514

TERMINAL DEVICE, BASE STATION DEVICE, AND UPLINK RESPONSE SIGNAL TRANSMISSION METHOD


Patent No. 10,893,514
Issue Date January 12, 2021
Title Terminal Device, Base Station Device, And Uplink Response Signal Transmission Method
Inventorship Toru Oizumi, Kanagawa (JP)
Ayako Horiuchi, Kanagawa (JP)
Kazuki Takeda, Kanagawa (JP)
Akihiko Nishio, Osaka (JP)
Assignee Sun Patent Trust, New York, NY (US)

Claim of US Patent No. 10,893,514

1. A base station comprising: a transmitter, which, in operation, transmits an enhanced physical downlink control channel (ePDCCH) and a first offset value, which is indicated by an acknowledgement/negative-acknowledgement (Ack/Nack) Resource Indicator (ARI), to a terminal apparatus; and a receiver, which, in operation, receives a response signal on a physical uplink control channel (PUCCH) resource from the terminal apparatus, the PUCCH resource determined by the terminal apparatus based on a leading enhanced control channel element (eCCE) index (neccE) of the ePDCCH and the first offset value, wherein the first offset value is one of a plurality of first offset values including a fixed offset and a variable offset, the variable offset is calculated using a formula that includes, as a parameter, a size of an ePDCCH search space set configured for the terminal apparatus, the size of the ePDCCH search space set for a special subframe is smaller than the size of the ePDCCH search space set for a non-special subframe such that an absolute value of the first offset value calculated for a special subframe is smaller than an absolute value of the first offset value calculated for a non-special subframe, and the fixed offset is used as the first offset in response to a first ARI transmitted to the terminal apparatus, and the variable offset is used as the first offset in response to a second ARI different from the first ARI transmitted to the terminal apparatus.