Uplink Retransmission Grant Timer Control for Low-Latency UE Scheduling

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing uplink retransmission grants, particularly in latency-sensitive services like extended reality (XR), due to network-side control of timers being unable to handle UE-specific power optimization and delay conditions effectively.

Innovation Solution

Implementing a mechanism where user equipment (UE) can enable or disable a timer for uplink retransmission grants on a per-configured-grant or per-HARQ-process basis, allowing UE to control power optimization and mitigate uplink delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If network-side control of timers is used for uplink retransmission grants, then centralized management is achieved, but UE-specific power optimization and delay conditions cannot be handled effectively

Engineering Contradiction:

Improvepower optimizationVSAvoidtimer control mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent divides the timer control mechanism into two independent components: network-side configured timers for centralized management and UE-specific timers for local power optimization. This segmentation allows each entity to manage timers independently based on its specific needs, resolving the contradiction between centralized control and UE-specific optimization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of the network controlling all timer operations, the patent inverts the control direction by allowing UEs to autonomously control their own timers for power optimization purposes. This inversion enables UEs to make real-time decisions about timer management based on their power state and delay conditions without network intervention.

Inventive Principle:

Principle #13The other way round (Inversion)

2Use of energy by moving object

If UEs autonomously control timers for power optimization, then power efficiency improves, but network coordination complexity increases

Engineering Contradiction:

ImproveUE power consumptionVSAvoidnetwork-UE synchronization

Core Design Contradiction:

Use of energy by moving objectVSLoss of information

Solution Approach 1:

The patent implements feedback mechanisms where UEs report their timer status and power state to the network, and the network provides configuration parameters to UEs. This bidirectional feedback ensures that autonomous UE timer control does not lose synchronization with network expectations, resolving the contradiction between power optimization and coordination.

Inventive Principle:

Principle #23Feedback

3Reliability

If retransmission grants are managed with strict timing, then reliability is improved, but latency in delay-tolerant services increases

Engineering Contradiction:

Improveuplink retransmission reliabilityVSAvoiduplink delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent makes timer durations dynamic rather than fixed, allowing them to be adjusted based on service type, power state, and delay conditions. For latency-sensitive services, shorter timers ensure quick retransmission, while for delay-tolerant services, longer timers reduce unnecessary retransmissions, resolving the contradiction between reliability and latency.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260040300A1Retransmissionless configured grant or hybrid automatic repeat request process

Publication Date: 2026.02.05 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a timer that defines a minimum duration associated with reception of an uplink retransmission grant. The UE may transmit an indication to enable or disable the timer on a per-configured-grant (per-CG) basis or on a per-hybrid-automatic-repeat-request process (per-HARQ-process) basis. Numerous other aspects are described.