HARQ Process Management for Wireless UE Resource Efficiency

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Solution Overview

Problem

In wireless communication systems, when a user equipment (UE) fails to receive the initial transmission of a transport block (TB) associated with a first redundancy version (RV), subsequent retransmissions with reserved modulation and coding schemes (MCS) cannot be decoded, leading to unnecessary resource consumption.

Innovation Solution

The UE obtains HARQ information indicating whether the network node is configured to retransmit the MCS indication before the end of each HARQ process. Based on this information, the UE decides whether to proceed, restart, or terminate the HARQ process after receiving a retransmission of the TB associated with a reserved MCS, where full decoding information is unavailable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the network node transmits retransmissions with reserved MCS without retransmitting the MCS indication, then resource consumption is reduced, but decoding fails when the initial MCS indication is not received

Engineering Contradiction:

Improveresource consumptionVSAvoiddecoding success

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The network node transmits the MCS indication in advance before transmitting the transport block. This preliminary action ensures that the UE has the necessary decoding information available before receiving subsequent retransmissions, resolving the contradiction by preventing decoding failures while allowing resource-efficient reserved MCS retransmissions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE provides feedback (ACK/NACK) to the network node regarding successful reception and decoding of the MCS indication and transport block. This feedback mechanism allows the network node to adapt its retransmission strategy, ensuring reliable delivery while optimizing resource consumption based on actual reception conditions

Inventive Principle:

Principle #23Feedback

2Productivity

If the UE continues HARQ retransmission processes without sufficient decoding information, then resource utilization is maintained, but unnecessary retransmissions occur consuming additional resources

Engineering Contradiction:

Improveresource utilizationVSAvoidunnecessary resource consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The UE autonomously determines whether to continue or terminate HARQ retransmission processes based on whether sufficient decoding information is available. This self-service mechanism allows the UE to make intelligent decisions about resource allocation, avoiding unnecessary retransmissions while maintaining efficient resource utilization when decoding is possible

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250105950A1Techniques for adaptation of hybrid automatic repeat request retransmission handling

Publication Date: 2025.03.27 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain hybrid automatic repeat request (HARQ) information indicating whether the network node is configured to perform a retransmission of decoding information prior to an end of HARQ processes associated with the network node. The UE may receive, for a HARQ process associated with a downlink communication from the network node, a retransmission of a transport block (TB) that is associated with a reserved MCS when full decoding information for the TB is unavailable. The UE may perform, based on a reception of a retransmission, an action to proceed with the HARQ process, to restart the HARQ process, or to terminate the HARQ process, wherein the action is based on whether the network node is configured to perform the retransmission of the indication of the MCS. Numerous other aspects are described.