# US 11,121,827 B2 · Wireless communications terminal, base station device, and resource allocation method

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- Number: US 11,121,827 B2
- Document ID: US11121827B2
- Status: Granted
- Kind: B2
- Application number: 16/672,078
- Filed: 2019-11-01
- Published: 2020-02-27
- Granted: 2021-09-14
- Earliest claimed: 2012-05-10
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Kazuki Takeda; Toru Oizumi; Ayako Horiuchi; Akihiko Nishio
- Web page: https://patentgrep.com/patent/US11121827B2

## CPC

- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)}
- H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The purpose of the present invention is to avoid ACK/NACK collision in a system in which E-PDCCH control information is transmitted, increase the utilization efficiency of ACK/NACK resources, and suppress unnecessary PUSCH band reduction. A wireless communications terminal having a configuration comprising: a reception unit that receives control signals including ACK/NACK indexes, via an expanded physical downlink control channel; a control unit that determines, on the basis of the ACK/NACK indexes, whether to use a dynamically allocated dynamic ACK/NACK resource or a specified resource specified beforehand, to send downlink data ACK/NACK signals; and a transmission unit that sends the ACK/NACK signals using the dynamic ACK/NACK resource or the specified resource, as determined.

## Claims

### Claim 1

An integrated circuit of a user equipment which, in operation, controls a process of the user equipment, the process comprising:
receiving a control signal including an ACK/NACK indicator via an enhanced physical downlink control channel (E-PDCCH), wherein the ACK/NACK indicator indicates one of four possible values including a first value and a second value;
determining, based on the ACK/NACK indicator and an enhanced control channel element (eCCE) number of the received E-PDCCH, a resource number to transmit an ACK/NACK signal for downlink data using a dynamic ACK/NACK resource dynamically allocated in accordance with the control signal,
wherein the first value indicates a first resource number and the second value indicates a second resource number, and when the first resource number and the second resource number are consecutive numbers, the first resource number and the second resource number indicate physically adjacent resources; and
transmitting the ACK/NACK signal using the dynamic ACK/NACK resource having the determined resource number when the ACK/NACK indicator indicates the first value or the second value.

### Claim 2 (depends on 1)

The integrated circuit of the user equipment according to claim 1, wherein:
the determining includes determining, based on the ACK/NACK indicator, whether to transmit the ACK/NACK signal using the dynamic ACK/NACK resource or using a specific resource, and
the transmitting includes transmitting the ACK/NACK signal using the specific resource when the ACK/NACK indicator indicates to use the specific resource.

### Claim 3 (depends on 1)

The integrated circuit of the user equipment according to claim 1, wherein:
the E-PDCCH is a channel that is frequency-multiplexed with a physical downlink data channel;
the control signal is transmitted by any one eCCE of a plurality of eCCEs constituting the E-PDCCH;
the dynamic ACK/NACK resource is resource associated with the eCCE number of the eCCE, the control signal is assigned to the ECCE, and the dynamic ACK/NACK resource is determined from among a plurality of resources included in a dynamic ACK/NACK region provided in an uplink channel; and
the ACK/NACK indicator is information for switching a resource used for transmitting the ACK/NACK signal.

### Claim 4 (depends on 3)

The integrated circuit of the user equipment according to claim 3, wherein the dynamic ACK/NACK region is set to overlap with a resource region to which a resource used for transmitting the ACK/NACK signal is dynamically allocated in accordance with a control signal received via a physical downlink control channel that is time-multiplexed with a physical downlink data channel.

### Claim 5 (depends on 2)

The integrated circuit of the user equipment according to claim 2, wherein the specific resource is specified by notification of radio resource control information.

### Claim 6 (depends on 3)

The integrated circuit of the user equipment according to claim 3, wherein the plurality of resources included in the dynamic ACK/NACK region includes both or one of a frequency resource and a code resource.