# US 2019/0245657 A1 · Uplink signal transmission method and user equipment

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- Number: US 2019/0245657 A1
- Document ID: US20190245657A1
- Status: Published application
- Kind: A1
- Application number: 16/316,612
- Filed: 2017-07-12
- Published: 2019-08-08
- Earliest claimed: 2016-07-12
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Sunyoung LEE; Seungjune YI
- Web page: https://patentgrep.com/patent/US20190245657A1

## CPC

- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1835: {Buffer management}
- H04W 72/04: Wireless resource allocation
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 80/02: Data link layer protocols
- H04W 88/023: {with message or information receiving capability}
- 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

According to the present invention, a user equipment (UE) receives semi-persistent scheduling (SPS) resource configuration information relating to SPS resources and receives an SPS command indicating activation or deactivation of the SPS resources. The UE flushes, in response to the SPS command, a buffer of an HARQ process associated with an SPS resource to transmit an SPS confirmation medium access control (MAC) control element (CE). The UE transmits a new MAC protocol data unit (PDU) including the SPS confirmation MAC CE on the SPS resource by using the HARQ process.

## Claims

### Claim 1

A method of transmitting an uplink signal by a user equipment (UE), the method comprising:
receiving semi-persistent scheduling (SPS) resource configuration information on SPS resources;
receiving an SPS command indicating activation or release of the SPS resources;
flushing a buffer of a hybrid automatic repeat and request (HARQ) process related to an SPS resource on which an SPS confirmation medium access control (MAC) control element (CE) is to be transmitted as a response to the SPS command; and
transmitting a new MAC protocol data unit (PDU) including the SPS confirmation MAC CE on the SPS resource using the HARQ process.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the UE flushes the HARQ buffer regardless of HARQ feedback for a current MAC PDU in the HARQ buffer and regardless of the number of transmissions performed for the current MAC PDU in the HARQ buffer.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the SPS resource on which the new MAC PDU is transmitted is an SPS resource first occurring after subframe n in which the UE receives the SPS command.

### Claim 4 (depends on 1)

The method of claim 1,
wherein the UE flushes the HARQ buffer upon receiving the SPS command.

### Claim 5

A user equipment (UE) for transmitting an uplink signal, the UE comprising,
a radio frequency (RF) unit, and
a processor configured to control the RF unit,
wherein the processor is configured to:
control the RF unit to receive semi-persistent scheduling (SPS) resource configuration information on SPS resources;
control the RF unit to receive an SPS command indicating activation or release of the SPS resources;
flush a buffer of a hybrid automatic repeat and request (HARQ) process related to an SPS resource on which an SPS confirmation medium access control (MAC) control element (CE) is to be transmitted as a response to the SPS command; and
control the RF unit to transmit a new MAC protocol data unit (PDU) including the SPS confirmation MAC CE on the SPS resource using the HARQ process.

### Claim 6 (depends on 5)

The UE of claim 5,
wherein the processor is configured to flush the HARQ buffer regardless of HARQ feedback for a current MAC PDU in the HARQ buffer and regardless of the number of transmissions performed for the current MAC PDU in the HARQ buffer.

### Claim 7 (depends on 5)

The UE of claim 5,
wherein the SPS resource on which the new MAC PDU is transmitted is an SPS resource first occurring after subframe n in which the UE receives the SPS command.

### Claim 8 (depends on 5)

The UE of claim 5,
wherein the processor is configured to flush the HARQ buffer upon receiving the SPS command.