CCA Power Signaling for Efficient COT Sharing in 5G NR

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Solution Overview

Problem

Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently managing channel occupancy time (COT) sharing due to inadequate clear channel access (CCA) power signaling, leading to inefficiencies and interference.

Innovation Solution

Implementing apparatuses and methods for CCA power signaling during COT sharing, specifically in 5G NR systems, to optimize channel access and reduce interference among devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If CCA power signaling is not implemented during COT sharing, then device complexity is reduced, but channel access efficiency deteriorates and interference increases

Engineering Contradiction:

Improvechannel access efficiencyVSAvoidCCA power signaling complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The UE reports its maximum peak EIRP capability to the base station before COT sharing occurs. The base station uses this pre-reported information to configure appropriate CCA power thresholds and Pout values, eliminating the need for complex real-time power negotiations during channel access.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The base station acts as an intermediary that receives the UE's EIRP capability report and translates it into configured CCA power parameters (Pout values, thresholds) that the UE can use autonomously during COT sharing, simplifying the UE's decision-making process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If maximum peak EIRP is reported for COT sharing, then channel occupancy time sharing is optimized, but information signaling overhead increases

Engineering Contradiction:

ImproveCOT sharing efficiencyVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The maximum peak EIRP report is transmitted once during initial capability exchange, allowing the base station to configure multiple Pout values for different CCA scenarios without requiring repeated signaling during actual COT sharing operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The base station configures a set of discrete Pout values based on the UE's reported EIRP capability, allowing the UE to select appropriate power levels from a pre-defined set rather than negotiating continuous power values, reducing signaling granularity overhead.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4094469B1Method for clear channel access power signaling in channel occupancy time

Publication Date: 2025.08.27 APPLE INC

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AI summary

Apparatuses, systems, and methods for CCA power signaling during COT sharing. A UE may report a maximum EIRP for COT sharing as a UE capability, e.g., for a frequency range between 52.6 and 71 gigahertz. The UE may receive a Pout value for CCA based on the UE capability and may report an actual EIRP used for CCA to acquire the COT. For configured grant COT sharing, the UE may perform a directional LBT with a specific EIRP and beam detection for a transmission burst and report a Pout value for COT sharing based on the directional LBT, e.g., via a configured grant uplink control indication. For dynamic grant COT sharing, the UE may detect that an EIRP exceeds a threshold and report a Pout value for COT sharing via a medium access control (MAC) control element. The threshold may be based on a closed loop power control setting.