Network-Initiated SR Polling in HARQ Feedback PUCCH Resources

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Solution Overview

Problem

Existing wireless communication systems, particularly in 5G NR, face inefficiencies in scheduling requests (SR) due to periodic monitoring by base stations, which limits flexibility and increases latency, and there is a need for more dynamic control over SR detection.

Innovation Solution

Implementing opportunistic SR polling, allowing base stations to dynamically control SR monitoring through non-periodic polling, enabling more efficient spatial sweeping and flexible resource scheduling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If base stations use periodic monitoring for scheduling requests, then SR detection can be performed regularly, but flexibility is limited and latency increases

Engineering Contradiction:

ImproveSR detection latencyVSAvoidSR monitoring flexibility

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic SR monitoring where the base station can initiate polling at flexible, non-periodic intervals based on network conditions and UE activity patterns. This allows the system to adapt monitoring frequency dynamically rather than being constrained to fixed periodic intervals, thereby reducing latency while maintaining flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs opportunistic polling that combines elements of periodic monitoring with event-triggered adjustments. The base station performs SR detection at scheduled intervals but can modify the timing and frequency of polls based on observed traffic patterns and network state, achieving a balance between regular monitoring and adaptive response.

Inventive Principle:

Principle #19Periodic action

2Productivity

If base stations perform frequent SR monitoring, then SR detection efficiency improves, but resource utilization decreases

Engineering Contradiction:

ImproveSR detection efficiencyVSAvoidresource utilization

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent implements a mechanism where UEs indicate their scheduling request status through uplink transmissions, allowing the base station to detect SR opportunities passively during regular uplink monitoring. This self-service approach enables the UE to actively signal when it needs resources, reducing the need for continuous active polling by the base station and improving overall resource efficiency.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system incorporates feedback mechanisms where UE uplink transmissions provide information about their scheduling needs to the base station. The base station uses this feedback to adjust its polling behavior, performing SR detection only when necessary based on the feedback received from UE activity patterns and buffer status indications.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12432711B2Network initiated polling for uplink scheduling request

Publication Date: 2025.09.30 QUALCOMM INC

AI summary

Aspects of methods, computer-readable mediums, and apparatuses are provided for a user equipment (UE) or a base station. The UE receives, from a base station, an indication to transmit a scheduling request (SR). The UE receives a downlink transmission triggering hybrid automatic repeat request (HARQ) feedback in one or more physical uplink control channel (PUCCH) resources. The UE transmits the SR to the base station in the one or more PUCCH resources for the HARQ feedback. The base station transmits, to a UE, an indication to transmit an SR. The base station transmits a downlink transmission triggering HARQ feedback in one or more PUCCH resources. The base station receives the SR from the UE in the one or more PUCCH resources.