# US 11,122,593 B2 · Base station, terminal, and communication method

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- Number: US 11,122,593 B2
- Document ID: US11122593B2
- Status: Granted
- Kind: B2
- Application number: 16/081,761
- Filed: 2016-03-30
- Published: 2020-08-27
- Granted: 2021-09-14
- Earliest claimed: 2016-03-30
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Ayako Horiuchi; Lilei Wang; Alexander Golitschek Edler Von Elbwart; Masayuki Hoshino
- Web page: https://patentgrep.com/patent/US11122593B2

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 72/535: {based on resource usage policies}
- H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)}
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0082: {at predetermined intervals}
- H04L 5/1469: {using time-sharing}
- H04W 28/04: Error control
- H04W 56/005: {compensating for timing error by adjustment in the receiver}
- 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

A base station is disclosed, which is capable of appropriately configuring the timings of data assignment, data transmission and reception, and feedback for a case where the DL and UL sTTI lengths are different from each other. In this base station (100), a transmission section (106) transmits a downlink signal using a first short transmission time interval (sTTI) shortened in length than a TTI and used for downlink; and a reception section (107) receives an uplink signal using a second sTTI shortened in length than the TTI and used for uplink. When the first sTTI is shorter in length than the second sTTI, the reception section (107) receives the uplink signal in the second sTTI positioned after a predetermined interval from the transmission timing of the downlink signal, the predetermined interval being configured based on the length of the first sTTI.

## Claims

### Claim 1

A terminal comprising:
a receiver, which, in operation, receives a downlink signal transmitted from a base station in a first short transmission time interval (sTTI) that is shorter than a subframe; and
a transmitter, which, in operation, transmits, to the base station, an uplink signal in a second sTTI after a determined number of first sTTIs from a reception timing of the downlink signal, the second sTTI being shorter than the subframe and longer than the first sTTI,
wherein the transmitter, in operation,
transmits the uplink signal in the second sTTI that first occurs after the determined number of first sTTIs from the reception timing of the downlink signal when a timing just after the determined number of first sTTIs from the reception timing of the downlink signal does not match a boundary between second sTTIs.

### Claim 2 (depends on 1)

The terminal according to claim 1, wherein the downlink signal includes downlink control information indicating an assignment of downlink data, and the uplink signal is an ACK/NACK signal for the downlink data.

### Claim 3 (depends on 1)

The terminal according to claim 1, wherein the downlink signal includes downlink control information indicating an assignment of the uplink signal, and the receiver, in operation, receives an ACK/NACK signal for the uplink signal, which is transmitted from the base station in the first sTTI after a determined number of first sTTIs from the second sTTI in which the uplink signal is transmitted.

### Claim 4 (depends on 3)

The terminal according to claim 3, wherein the receiver, in operation, receives the ACK/NACK signal in the first sTTI just before the first sTTI in which the downlink control information of an HARQ process ID identical to an HARQ process ID of the ACK/NACK signal is transmitted.

### Claim 5 (depends on 1)

The terminal according to claim 1, wherein the transmitter, in operation, transmits the uplink signal in the second sTTI after the determined number of first sTTIs and an absolute time from the reception timing of the downlink signal.

### Claim 6 (depends on 1)

The terminal according to claim 1, wherein the transmitter, in operation, transmits the uplink signal in the second sTTI after a larger one of the determined number of first sTTIs and an absolute time from the reception timing of the downlink signal.

### Claim 7 (depends on 1)

The terminal according to claim 1, wherein the transmitter and the receiver, in operation, use a common HARQ process ID or keep a HARQ process ID in switching between sTTI and TTI that is the subframe.

### Claim 8 (depends on 1)

The terminal according to claim 1, wherein the determined number is configured as a variable parameter between the base station and terminal.

### Claim 9

A communication method comprising:
receiving a downlink signal transmitted from a base station in a first short transmission time interval (sTTI) that is shorter than a subframe; and
transmitting, to the base station, an uplink signal in a second sTTI after a determined number of first sTTIs from a reception timing of the downlink signal, the second sTTI being shorter than the subframe and longer than the first sTTI,
wherein the transmitting includes:
transmitting the uplink signal in the second sTTI that first occurs after the determined number of first sTTIs from the reception timing of the downlink signal when a timing just after the determined number of first sTTIs from the reception timing of the downlink signal does not match a boundary between second sTTIs.

### Claim 10 (depends on 9)

The communication method according to claim 9, wherein the downlink signal includes downlink control information indicating an assignment of downlink data, and the uplink signal is an ACK/NACK signal for the downlink data.

### Claim 11 (depends on 9)

The communication method according to claim 9, wherein the downlink signal includes downlink control information indicating an assignment of the uplink signal, and the receiving includes receiving an ACK/NACK signal for the uplink signal, which is transmitted from the base station in the first sTTI after a determined number of first sTTIs from the second sTTI in which the uplink signal is transmitted.

### Claim 12 (depends on 11)

The communication method according to claim 11, wherein the receiving includes receiving the ACK/NACK signal in the first sTTI just before the first sTTI in which the downlink control information of an HARQ process ID identical to an HARQ process ID of the ACK/NACK signal is transmitted.

### Claim 13 (depends on 9)

The communication method according to claim 9, wherein the transmitting includes transmitting the uplink signal in the second sTTI after the determined number of first sTTIs and an absolute time from the reception timing of the downlink signal.

### Claim 14 (depends on 9)

The communication method according to claim 9, wherein the transmitting includes transmitting the uplink signal in the second sTTI after a larger one of the determined number of first sTTIs and an absolute time from the reception timing of the downlink signal.

### Claim 15 (depends on 9)

The communication method according to claim 9, comprising:
using a common HARQ process ID or keeping a HARQ process ID in switching between sTTI and TTI that is the subframe.

### Claim 16 (depends on 9)

The communication method according to claim 9, wherein the determined number is configured as a variable parameter.

### Claim 17 (depends on 1)

The terminal according to claim 1, wherein the determined number is applied to all of the first sTTIs of the subframe.

### Claim 18 (depends on 9)

The communication method according to claim 9, wherein the determined number is applied to all of the first sTTIs of the subframe.