# US 11,909,534 B2 · HARQ feedback method and apparatus

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- Number: US 11,909,534 B2
- Document ID: US11909534B2
- Status: Granted
- Kind: B2
- Application number: 17/889,663
- Filed: 2022-08-17
- Published: 2022-12-08
- Granted: 2024-02-20
- Earliest claimed: 2018-04-26
- Assignees: Beijing Xiaomi Mobile Software Co., Ltd.
- Applicants: Beijing Xiaomi Mobile Software Co., Ltd.
- Inventors: Qin Mu; Ming Zhang
- Web page: https://patentgrep.com/patent/US11909534B2

## CPC

- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/189: {Transmission or retransmission of more than one copy of a message}
- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/535: {based on resource usage policies}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- Y02D 30/70: in wireless communication networks
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A hybrid automatic repeat request (HARQ) feedback method is applied to a terminal, wherein a base station allocates to the terminal multiple available scheduling resources configured to provide Early Data Transmission (EDT) service. The method includes: selecting an available scheduling resource from the multiple available scheduling resources; sending EDT data to the base station on the selected available scheduling resource; determining a HARQ feedback time point for the EDT data according to a preset rule; and when HARQ information sent by the base station is received at the HARQ feedback time point, determining a transmission result of the EDT data based on the HARQ information.

## Claims

### Claim 1

A hybrid automatic repeat request (HARQ) feedback method, applicable to a base station that allocates, to a terminal, multiple available scheduling resources configured to provide Early Data Transmission (EDT) service, the method comprising:
performing blind detection on EDT data transmitted to the base station by the terminal on the multiple available scheduling resources;
determining a HARQ feedback time point for the blind detection according to a preset rule that a HARQ feedback is made for a plurality of uplink (UL) transmission ending time points respectively for the multiple available scheduling resources, comprising:
for each available scheduling resource, determining a respective UL transmission ending time point based on a Transmission Block Size (TBS) and a UL transmission repetition count in the available scheduling resource; and
for each UL transmission ending time point, determining a respective HARQ feedback time point, wherein the determined HARQ feedback time point is at a specified position after the UL transmission ending time point; and
sending HARQ information about the blind detection to the terminal at the HARQ feedback time point.

### Claim 2 (depends on 1)

The HARQ feedback method of claim 1, wherein the EDT data is uplink (UL) data transmitted by the terminal in a random access process and is in a message 3 in the random access process.

### Claim 3 (depends on 1)

The HARQ feedback method of claim 1, wherein the HARQ information about the blind detection comprises first information indicating successful demodulation or second information indicating unsuccessful demodulation; and
sending the HARQ information about the blind detection to the terminal at the HARQ feedback time point comprises:
in response to determining that a blind detection result at any UL transmission ending time point is successful demodulation, sending the first information to the terminal at the HARQ feedback time point corresponding to the UL transmission ending time point; and
in response to determining that the blind detection result is unsuccessful demodulation, sending the second information to the terminal at the HARQ feedback time point corresponding to the UL transmission ending time point.

### Claim 4 (depends on 1)

The HARQ feedback method of claim 1, wherein the specified position is configured by the base station and is in a UL grant in a Random Access Response (RAR) sent to the terminal by the base station; or
the preset rule comprises third information indicating the specified position, and the third information indicates a relative relationship between a HARQ feedback time point and a determined UL transmission ending time point.

### Claim 5

A hybrid automatic repeat request (HARQ) feedback method, applicable to a base station that allocates, to a terminal, multiple available scheduling resources configured to provide Early Data Transmission (EDT) service, the method comprising:
performing blind detection on EDT data transmitted to the base station by the terminal on the multiple available scheduling resources;
determining a HARQ feedback time point for the blind detection according to a preset rule that a HARQ feedback is made only when a blind detection result is successful demodulation, comprising:
for each available scheduling resource, determining a respective uplink (UL) transmission ending time point based on a Transmission Block Size (TBS) and a UL transmission repetition count in the available scheduling resource; and
for each UL transmission ending time point, determining a respective HARQ feedback time point, wherein the determined HARQ feedback time point is at a specified position after the UL transmission ending time point; and
sending HARQ information about the blind detection to the terminal at the HARQ feedback time point.

### Claim 6 (depends on 5)

The HARQ feedback method of claim 5, wherein the HARQ information about the blind detection comprises first information indicating successful demodulation; and
sending the HARQ information about the blind detection to the terminal at the HARQ feedback time point comprises:
in response to determining that a blind detection result at any UL transmission ending time point is successful demodulation, sending the first information to the terminal at the HARQ feedback time point corresponding to the UL transmission ending time point; and
in response to determining that the blind detection result is unsuccessful demodulation, not performing HARQ feedback at the HARQ feedback time point corresponding to the UL transmission ending time point.

### Claim 7 (depends on 5)

The HARQ feedback method of claim 5, wherein the specified position is configured by the base station and is in a UL grant in a Random Access Response (RAR) sent to the terminal by the base station; or
the preset rule comprises third information indicating the specified position, and the third information indicates a relative relationship between a HARQ feedback time point and a determined UL transmission ending time point.

### Claim 8 (depends on 5)

The HARQ feedback method of claim 5, wherein the EDT data is uplink (UL) data transmitted by the terminal in a random access process and is in a message 3 in the random access process.

### Claim 9

A base station that allocates to, a terminal, multiple available scheduling resources configured to provide Early Data Transmission (EDT) service, the base station comprising:
a processor; and
memory configured to store instructions executable by a processor,
wherein the processor is configured to:
perform blind detection on EDT data transmitted to the base station by the terminal on the multiple available scheduling resources;
determine a hybrid automatic repeat request (HARQ) feedback time point for the blind detection according to a preset rule that a HARQ feedback is made based on a maximum uplink transmission repetition count, comprising:
for each available scheduling resource, determining a respective uplink (UL) transmission ending time point based on a Transmission Block Size (TBS) and a UL transmission repetition count in the available scheduling resource;
determining the maximum UL transmission repetition count according to UL transmission repetition counts in the multiple available scheduling resources;
determining an UL transmission ending time point corresponding to the maximum UL transmission repetition count according to UL transmission ending time points corresponding to the multiple available scheduling resources; and
determining the HARQ feedback time point based on the UL transmission ending time point corresponding to the maximum UL transmission repetition count, wherein the determined HARQ feedback time point is at a specified position after the UL transmission ending time point corresponding to the maximum UL transmission repetition count; and
send HARQ information about the blind detection to the terminal at the HARQ feedback time point.

### Claim 10 (depends on 9)

The base station of claim 9, wherein the EDT data is uplink (UL) data transmitted by the terminal in a random access process and is in a message 3 in the random access process.

### Claim 11 (depends on 9)

The base station of claim 9, wherein the HARQ information about the blind detection comprises first information indicating successful demodulation or second information indicating unsuccessful demodulation; and in sending the HARQ information about the blind detection to the terminal at the HARQ feedback time point, the processor is further configured to:
send the first information to the terminal at the HARQ feedback time point in response to determining that each blind detection result at each UL transmission ending time point comprises successful demodulation; and
send the second information to the terminal at the HARQ feedback time point in response to determining that each blind detection result does not comprise successful demodulation.

### Claim 12 (depends on 9)

The base station of claim 9, wherein the specified position is configured by the base station and is in a UL grant in a Random Access Response (RAR) sent to the terminal by the base station; or
the preset rule comprises third information indicating the specified position, and the third information indicates a relative relationship between a HARQ feedback time point and a determined UL transmission ending time point.