Scheduling Request Prioritization via PUCCH Physical Layer Mapping

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Solution Overview

Problem

In Ultra-Reliable Low-Latency Communication (URLLC) systems, existing designs fail to effectively prioritize scheduling requests based on physical layer properties, leading to conflicts between different types of control signaling.

Innovation Solution

The proposed solution involves mapping scheduling request (SR) priorities to physical layer properties of the Physical Uplink Control Channel (PUCCH) resources, allowing for prioritization based on logical channel properties and configurable thresholds, and resolving ambiguity by selecting the highest or lowest priority when multiple mappings occur.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If scheduling requests are transmitted using conventional PUCCH resources without priority mapping, then the system structure remains simple, but the ability to prioritize SR requests based on latency and reliability requirements is lost

Engineering Contradiction:

ImproveSR prioritization accuracyVSAvoidPUCCH resource configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by mapping SR priorities to different PUCCH resource parameters (such as frequency, time, or code division). By changing the physical layer parameters based on SR priority, the system achieves reliable prioritization without complex signaling. High-priority SRs are mapped to resources with better protection or lower latency characteristics, resolving the contradiction between prioritization accuracy and system simplicity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces an intermediary mapping mechanism between SR priorities and PUCCH resource properties. This intermediary layer (the mapping relationship) translates logical channel priorities into physical layer resource assignments, enabling indirect prioritization that maintains system simplicity while achieving reliable SR handling.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple SR configurations map to the same PUCCH resource, then resource utilization is efficient, but priority ambiguity arises when multiple logical channels compete for the same resource

Engineering Contradiction:

ImprovePUCCH resource utilizationVSAvoidSR priority information

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent applies local quality by assigning different characteristics to different PUCCH resources based on their priority level. Even when multiple SR configurations map to the same resource, the system distinguishes between high-priority and low-priority SRs through the mapping relationship itself, allowing differentiated handling at the physical layer while maintaining resource efficiency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements preliminary action by pre-establishing the mapping between SR priorities and PUCCH resource properties before SR transmission occurs. This pre-configuration ensures that when multiple SRs compete for the same resource, the priority information is already embedded in the resource assignment, eliminating ambiguity without requiring additional signaling.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If SR priority is indicated through higher layer signaling, then the configuration is flexible, but the physical layer cannot directly utilize priority information for timely scheduling decisions

Engineering Contradiction:

ImproveSR configuration flexibilityVSAvoidScheduling decision speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent replaces higher layer signaling mechanisms with physical layer mechanisms for priority indication. By mapping SR priorities to physical layer properties (frequency, time, or code resources), the system eliminates the need for complex higher layer signaling while enabling fast physical layer scheduling decisions. This substitution maintains configuration flexibility through the mapping relationship while dramatically improving decision speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20220312437A1Scheduling request prioritization

Publication Date: 2022.09.29 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Systems and methods for scheduling request (SR) prioritization are disclosed herein. In one embodiment, a method performed by a wireless device for prioritized SR transmission comprises transmitting, to a base station, a SR for data generated on a particular logical channel on a Physical Uplink Control Channel (PUCCH) resource in accordance with an associated SR configuration, wherein a SR priority of the SR is indicated by one or more physical layer properties of the PUCCH resource, in accordance with a mapping between the one or more physical layer properties of the PUCCH and the SR priority.