Semi-Static Channel Access Using Remaining Channel Occupancy Time

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Solution Overview

Problem

Existing wireless communication systems face limitations in communication flexibility and efficiency, particularly in managing channel occupancy times and resource allocation in 3GPP LTE and NR networks.

Innovation Solution

Implementing a semi-static channel access procedure configured by RRC information, with optional CSI-RS, to determine channel occupancy duration, ensuring CSI-RS transmission or reception based on remaining channel occupancy, enhancing flexibility and efficiency in channel usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing communication structures are used, then system simplicity is maintained, but communication flexibility and efficiency are limited

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidcommunication structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic channel occupancy time determination by allowing the gNB to transmit Channel Occupancy Time (COT) information to UEs, enabling the communication structure to adapt its duration based on actual channel conditions and traffic requirements rather than using fixed predetermined timeslots

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The gNB performs preliminary channel sensing and COT determination before data transmission, then communicates the determined COT to UEs in advance through RRC signaling or DCI, allowing UEs to prepare their transmissions accordingly and avoid collisions

Inventive Principle:

Principle #10Preliminary action

2Productivity

If channel occupancy time is extended, then communication efficiency is improved, but risk of channel conflicts increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidchannel access reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The gNB transmits COT indication information to UEs as feedback about the determined channel occupancy duration, and UEs provide feedback acknowledgments to confirm receipt and understanding of the COT parameters, enabling coordinated channel access

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The channel occupancy time is segmented into distinct phases: gNB transmission period, UE reception period, and UE transmission period within uplink grants, with clear boundary definitions to prevent overlapping and conflicts

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If CSI-RS transmission is performed continuously, then channel state information quality is maintained, but energy consumption increases

Engineering Contradiction:

Improvechannel state information qualityVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

CSI-RS transmissions are configured with periodic patterns where reference signals are transmitted only at specific intervals and subframes rather than continuously, allowing the system to maintain channel state information quality while significantly reducing energy consumption during periods when updates are not required

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts CSI-RS configuration parameters including periodicity, bandwidth, and power levels based on channel conditions, UE mobility, and traffic requirements, optimizing the balance between measurement precision and energy consumption

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12563592B2User equipments, base stations, and methods for determining a channel occupancy time based on remaining channel occupancy duration

Publication Date: 2026.02.24 SHARP KK

AI summary

A user equipment (UE) is described. The UE may comprise higher layer processing circuitry configured to acquire first radio resource control (RRC) information and second RRC information. The first RRC information configuring a semi-static channel access procedure. The second RRC information configuring a Channel State Information-Reference Signal (CSI-RS). The UE may also comprise receiving circuitry configured to receive the CSI-RS. If neither third RRC information for configuring a channel occupancy duration field nor fourth RRC information for configuring slot format indicator field is provided, a channel occupancy time for the semi-static channel access procedure is assumed to be a remaining channel occupancy duration indicated by the channel occupancy duration field.