# US 8,751,893 B2 · Synchronous hybrid automatic repeat request (HARQ) protocol employing a first information element indicating whether to perform retransmission of an uplink data packet and a second information element indicates modulation and coding scheme (MCS) for the retransmission

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,751,893 B2
- Document ID: US8751893B2
- Status: Granted
- Kind: B2
- Application number: 13/849,082
- Filed: 2013-03-22
- Published: 2013-08-22
- Granted: 2014-06-10
- Earliest claimed: 2004-04-01
- Assignees: Panasonic Corporation
- Applicants: Optis Wireless Technology, LLC
- Inventors: Joachim Lohr; Eiko Seidel; Dieter Petermann
- Web page: https://patentgrep.com/patent/US8751893B2

## CPC

- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 1/0006: {by adapting the transmission format}
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 1/1803: Stop-and-wait protocols
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A base station receives an uplink data packet from a user equipment based on a synchronous hybrid automatic repeat request (HARQ) protocol, and transmits a first information element and a second information element in parallel to the user equipment. The first information element indicates whether to perform a retransmission of the uplink data packet, and the second information element indicates modulation and coding scheme (MCS) for the retransmission. The base station receives the retransmission from the user equipment according to the modulation and coding scheme. The first information element is for example an ACK/NACK feedback message.

## Claims

### Claim 1

A method comprising the following steps performed by a user equipment:
transmitting an uplink data packet to a base station based on a synchronous hybrid automatic repeat request (HARQ) protocol,
receiving a first information element and a second information element in parallel from the base station, wherein the first information element is an ACK/NACK message and the second information element indicates a modulation and coding scheme (MCS) for a retransmission, and
transmitting the retransmission to the base station according to the modulation and coding scheme.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first information element indicates whether to perform the retransmission of the uplink data packet.

### Claim 3

A user equipment comprising:
a transmitter section that transmits an uplink data packet to a base station on a synchronous hybrid automatic repeat request (HARQ) protocol, and
a receiver section that receives a first information element and a second in-formation element in parallel from a base station, wherein the first information element is an ACK/NACK message, and the second information element indi-cates a modulation and coding scheme (MCS) for a retransmission,
wherein the transmitter section transmits the retransmission to the base station according to the modulation and coding scheme.

### Claim 4 (depends on 3)

The user equipment according to the claim 3, wherein the first information element indicates whether to perform the retransmission of the uplink data packet.