Sidelink CoT Sharing for Low-Latency Reference Signal Broadcast

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Solution Overview

Problem

The decentralized nature of sidelink communication poses challenges in managing signaling among different entities, particularly in vehicle-to-everything (V2X) systems, where efficient coordination of channel occupancy time (CoT) for transmitting reference signals is needed to support accurate location estimation and communication among vehicles and external systems.

Innovation Solution

A method and system for wireless communication devices to form positioning groups, transmit and receive group formation broadcast messages, and utilize channel occupancy time (CoT) to share transmission opportunities for communicating reference signals, enabling efficient opportunistic CoT sharing among multiple devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If decentralized sidelink communication is used to enable direct device-to-device signaling, then communication efficiency and speed are improved, but coordination challenges and signaling management complexity increase

Engineering Contradiction:

Improvecommunication speedVSAvoidsignaling management complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent segments the decentralized sidelink communication into organized positioning groups with designated group heads. Each group head coordinates reference signal transmission for its members, dividing the complex coordination task into manageable segments while maintaining direct device-to-device communication benefits

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces group heads as intermediary entities that mediate coordination between devices in the positioning group. These group heads manage reference signal transmission timing and channel occupancy, reducing overall signaling complexity while preserving fast direct communication

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If channel occupancy time is shared among multiple positioning groups, then channel utilization efficiency is improved, but coordination overhead and timing synchronization difficulty increase

Engineering Contradiction:

Improvechannel utilization efficiencyVSAvoidcoordination overhead

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges channel occupancy time resources among multiple positioning groups, allowing groups to share transmission opportunities. This consolidation improves channel utilization by reducing idle time while the standardized sharing mechanism keeps coordination overhead manageable

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements periodic channel occupancy time sharing patterns with defined transmission opportunities for different positioning groups. This periodic structure provides predictable timing that simplifies synchronization while maximizing channel usage through systematic resource allocation

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If reference signals are transmitted frequently to improve location estimation accuracy, then measurement precision is improved, but channel resource consumption and transmission latency increase

Engineering Contradiction:

Improvelocation estimation accuracyVSAvoidtransmission latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent enables continuous reference signal transmission within shared channel occupancy time periods by coordinating multiple positioning groups. This continuous transmission approach maintains high location estimation accuracy while reducing gaps that would cause latency, as signals are transmitted back-to-back across group boundaries

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS12562868B2Low-latency opportunistic channel occupancy time sharing

Publication Date: 2026.02.24 QUALCOMM INC

AI summary

Aspects relate to group-based reference signal broadcast in a wireless communication network. A first wireless communication device may transmit a first group formation broadcast message associated with a first positioning group comprising a first plurality of wireless communication devices including the first wireless communication device. The first wireless communication device may receive a second group formation broadcast message associated with a second positioning group comprising a second plurality of wireless communication devices including a second wireless communication device. The second positioning group may be associated with a channel occupancy time (CoT) in a sidelink channel. The CoT may comprise transmission opportunities configured to be used by the second plurality of wireless communication devices for communicating reference signals. The first wireless communication device may initiate transmission of reference signals by the first plurality of wireless communication devices using additional transmission opportunities within the CoT associated with the second positioning group.