COT Sharing Boundary Indication in Unlicensed NR Systems
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Solution Overview
Problem
Current wireless communication systems in unlicensed spectra face challenges in efficiently managing channel occupancy time (COT) sharing between user equipment (UE) and base stations, particularly in maintaining fair coexistence with other technologies and ensuring robust COT sharing indications.
Innovation Solution
The proposed solution involves a UE device that acquires a channel occupancy time (COT) in the unlicensed spectrum, determines the number of remaining consecutive subframes for PUSCH transmission, and generates uplink control information (UCI) to indicate the COT sharing boundary. This UCI is transmitted during the PUSCH transmission, allowing the base station to accurately determine the COT sharing boundary and initiate channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If COT sharing is implemented in unlicensed spectrum, then spectrum utilization efficiency is improved, but coexistence fairness with other technologies deteriorates
Solution Approach 1:
The UE transmits COT sharing indication information in advance during uplink data transmission before the COT expires. This allows the base station to prepare for channel access in advance, ensuring smooth transition and fair coexistence while maintaining high spectrum utilization efficiency.
Solution Approach 2:
The system implements feedback mechanism where the UE provides COT sharing indication to the base station, enabling the base station to adjust its channel access strategy accordingly. This feedback loop ensures fair coexistence while maximizing spectrum utilization through coordinated resource management.
2Loss of information
If COT sharing indication is transmitted during PUSCH, then signaling overhead is reduced, but reliability of COT sharing indication deteriorates
Solution Approach 1:
The COT sharing indication information is merged with uplink data transmission in the PUSCH channel. This combines control signaling and data transmission into a single channel, reducing overall signaling overhead while maintaining reliable delivery through the established PUSCH transmission mechanism.
Solution Approach 2:
The PUSCH channel is given multi-functionality by allowing it to carry both uplink data and COT sharing indication information. This universal approach reduces the need for separate dedicated control channels, lowering signaling overhead while preserving reliability through the robust PUSCH transmission framework.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for a wireless communication system in an unlicensed spectrum. A user equipment (UE) device of the wireless communication system includes a processor circuitry and radio front end circuitry. The processor circuitry is configured to acquire a channel occupancy time (COT) in the unlicensed spectrum, and determine a number of remaining consecutive subframes allocated for physical uplink shared channel (PUSCH) transmission to a base station. The processor circuitry is configured to generate uplink control information (UCI) to indicate a COT sharing boundary occurring at an end of the remaining consecutive subframes. The radio front end circuitry is coupled to the processor circuitry and configured to transmit the UCI in the PUSCH) transmission during one of the remaining consecutive subframes. The processor circuitry is also configured to monitor downlink transmissions from the base station following the COT sharing boundary.