Uplink Overhead Reduction via Selective HARQ-ACK Multiplexing

Solution Overview

Problem

In New Radio (NR) mobile communications, the Type-1 HARQ-ACK codebook transmission leads to increased uplink overhead, resulting in higher power consumption and radio interference, even when little or no data is received on PDSCH occasions, as the UE is required to transmit full HARQ-ACK information.

Innovation Solution

The proposed solution involves an apparatus that determines whether to multiplex HARQ-ACK information in a PUSCH transmission and generates only the necessary HARQ-ACK information corresponding to the received PDSCH, reducing the overhead by transmitting only the required data, and canceling the generation of the full HARQ-ACK codebook when specific rules or scenarios are satisfied.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE transmits full HARQ-ACK codebook to improve transmission reliability, then the reliability is improved, but the uplink overhead increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoiduplink overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts only the necessary HARQ-ACK information bits corresponding to actually received PDSCH occasions from the full HARQ-ACK codebook. The UE determines which PDSCH occasions had actual data reception and includes only those ACK/NACK bits in the uplink transmission, removing redundant bits for occasions where no PDSCH was received.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of transmitting the complete HARQ-ACK codebook for all configured PDSCH occasions, the patent applies partial action by transmitting only the subset of HARQ-ACK bits corresponding to actually received PDSCH. This reduces the quantity of transmitted information while maintaining the necessary feedback functionality.

Inventive Principle:

Principle #16Partial or excessive action

2Loss of information

If the UE transmits full HARQ-ACK codebook to ensure complete feedback, then the feedback completeness is improved, but the UE power consumption increases

Engineering Contradiction:

Improvefeedback completenessVSAvoidUE power consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The patent extracts only the necessary HARQ-ACK information bits corresponding to actually received PDSCH occasions from the full HARQ-ACK codebook. The UE determines which PDSCH occasions had actual data reception and includes only those ACK/NACK bits in the uplink transmission, removing redundant bits for occasions where no PDSCH was received.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of transmitting the complete HARQ-ACK codebook for all configured PDSCH occasions, the patent applies partial action by transmitting only the subset of HARQ-ACK bits corresponding to actually received PDSCH. This reduces the quantity of transmitted information while maintaining the necessary feedback functionality.

Inventive Principle:

Principle #16Partial or excessive action

3Loss of information

If the UE transmits full HARQ-ACK codebook to maintain comprehensive acknowledgment, then the acknowledgment completeness is improved, but the radio interference increases

Engineering Contradiction:

Improveacknowledgment completenessVSAvoidradio interference

Core Design Contradiction:

Loss of informationVSObject-generated harmful factors

Solution Approach 1:

The patent extracts only the necessary HARQ-ACK information bits corresponding to actually received PDSCH occasions from the full HARQ-ACK codebook. The UE determines which PDSCH occasions had actual data reception and includes only those ACK/NACK bits in the uplink transmission, removing redundant bits for occasions where no PDSCH was received.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of transmitting the complete HARQ-ACK codebook for all configured PDSCH occasions, the patent applies partial action by transmitting only the subset of HARQ-ACK bits corresponding to actually received PDSCH. This reduces the quantity of transmitted information while maintaining the necessary feedback functionality.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10855403B2Method and apparatus for reducing uplink overhead in mobile communications

Publication Date: 2020.12.01 HFI INNOVATION INC

AI summary

Various solutions for reducing uplink overhead with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether to multiplex hybrid automatic repeat request-acknowledgement (HARQ-ACK) information in a physical uplink shared channel (PUSCH) transmission. The apparatus may determine whether only a physical downlink shared channel (PDSCH) is received. The apparatus may generate only the HARQ-ACK information corresponding to the PDSCH in an event that only the PDSCH is received. The apparatus may transmit the HARQ-ACK information in the PUSCH transmission.