Multicast Group Channel Occupancy Information Reporting

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR, face challenges in efficiently coordinating sidelink communications among user equipment (UEs) due to resource occupancy uncertainties.

Innovation Solution

The implementation of channel occupancy information (COI) multi-access reporting, where UEs within a multicast group share COI indicating resource occupancy, allowing for informed resource selection and reduced interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If UEs perform sensing operations to determine resource occupancy, then resource selection accuracy is improved, but system complexity and overhead increase

Engineering Contradiction:

Improveresource occupancy detection accuracyVSAvoidsensing operation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple UEs are merged into a multicast group where they collectively perform sensing operations and share COI reports. Instead of each UE independently performing full sensing, the group combines sensing results through COI sharing, reducing individual UE complexity while maintaining overall detection accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

A feedback mechanism is established where UEs report COI to each other within the multicast group. This feedback loop allows UEs to adjust their resource selection based on occupancy information from others, improving measurement precision without requiring each UE to perform exhaustive sensing alone.

Inventive Principle:

Principle #23Feedback

2Reliability

If COI is shared among all UEs in the multicast group, then resource collision is reduced, but communication overhead increases

Engineering Contradiction:

Improveresource selection reliabilityVSAvoidcommunication overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

Only essential COI parameters are extracted and shared among UEs, rather than transmitting complete sensing data. This selective extraction reduces communication overhead while retaining the critical information needed for reliable resource selection and collision avoidance.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If UEs select transmission periods based on COI, then resource collision is minimized, but coordination complexity increases

Engineering Contradiction:

Improvesidelink communication efficiencyVSAvoidcoordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

UEs perform sensing operations and obtain COI in advance before selecting transmission periods. This preliminary action allows UEs to proactively identify suitable resources and avoid collisions, improving productivity without requiring complex real-time coordination during actual transmission.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12238767B2Channel occupancy information multi-access reporting

Publication Date: 2025.02.25 QUALCOMM INC

AI summary

User equipments (UEs) may be configured to perform channel occupancy information multi-access reporting. In some aspects, a user equipment may receive a sidelink configuration message identifying the first UE and one or more other UEs as members of a multicast group and a resource to be used for sidelink communications amongst the multicast group, and receive channel occupancy information (COI) from at least one of the one or more UEs within the multicast group, the COI indicating an occupied condition of the resource determined by the at least one of the one or more UEs during a sensing operation performed with respect to the resource. Further, the UE may select a period of time to transmit a sidelink communication based at least in part on the COI.