Uplink Retransmission Feedback for Shared Resource Pools

Solution Overview

Problem

In resource pool based uplink transmissions, network nodes are unable to determine which UE is transmitting, leading to inefficient retransmissions and degraded system performance due to the lack of feedback on successful decoding.

Innovation Solution

Implementing feedback mechanisms for resource pool based uplink transmissions, where UEs receive acknowledgement (ACK) or negative acknowledgement (NACK) via broadcast messages, allowing UEs to determine if retransmissions are necessary based on successful decoding by the network node.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If resource pool based uplink transmissions are used without feedback mechanisms, then device complexity is reduced, but system performance deteriorates due to inefficient retransmissions

Engineering Contradiction:

Improvefeedback mechanism complexityVSAvoidsystem performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where network nodes transmit feedback information to UEs indicating whether uplink transmissions were successfully decoded. This enables UEs to determine whether retransmissions are necessary, thereby improving system performance by preventing unnecessary retransmissions while maintaining manageable complexity through standardized feedback protocols.

Inventive Principle:

Principle #23Feedback

2Reliability

If feedback mechanisms are implemented for resource pool based uplink transmissions, then system performance improves through efficient retransmission management, but device complexity increases

Engineering Contradiction:

Improvesystem performanceVSAvoidfeedback mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where network nodes transmit feedback information to UEs indicating whether uplink transmissions were successfully decoded. This enables UEs to determine whether retransmissions are necessary, thereby improving system performance by preventing unnecessary retransmissions while maintaining manageable complexity through standardized feedback protocols.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If broadcast feedback messages are used for resource pool based uplink transmissions, then measurement precision is improved through accurate decoding confirmation, but loss of information increases due to lack of UE-specific feedback

Engineering Contradiction:

Improvedecoding confirmation accuracyVSAvoidUE identification information

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent segments the feedback information by associating feedback with specific resource indicators that UEs can use to identify their own transmissions within the broadcast feedback message. This allows precise decoding confirmation for each UE's transmission while maintaining the efficiency of broadcast-based feedback, preventing information loss through structured feedback messaging.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260019999A1Resource pool based uplink retransmissions

Publication Date: 2026.01.15 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an uplink transmission using a resource selected from a resource pool, wherein the resource pool is allocated for a plurality of UEs. The UE may receive a feedback indicating whether one or more resources in the resource pool have been successfully decoded by a network node, wherein a retransmission of the uplink transmission is based at least in part on the feedback. Numerous other aspects are described.