COT Sharing Signaling for Low-Latency Unlicensed Downlink
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in utilizing configured-grant and sidelink transmission schemes, particularly in unlicensed spectrum, leading to suboptimal resource utilization and increased latency.
Innovation Solution
Implementing configured-grant uplink control information (CG-UCI) during a channel occupancy time (COT) in unlicensed spectrum, which includes indications of time delay and duration for downlink transmission opportunities, allowing efficient resource sharing and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If configured-grant transmission is used in unlicensed spectrum, then resource utilization is improved, but latency increases due to channel access requirements
Solution Approach 1:
The base station performs preliminary actions by transmitting a first signal to reserve the channel before the UE transmits its configured-grant uplink signal. This channel reservation mechanism allows the UE to transmit immediately without waiting for channel access, thereby reducing latency while maintaining efficient resource utilization through configured-grant transmission.
2Productivity
If channel occupancy time sharing is implemented, then resource efficiency is improved, but protocol complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the base station transmits a first signal acting as a mediator between the channel access decision and the actual transmission. This signal carries channel occupancy time information that coordinates between multiple UEs, enabling efficient resource sharing while managing protocol complexity through standardized signaling procedures.
3Productivity
If multiple UEs share configured-grant resources, then system capacity is improved, but resource allocation conflicts increase
Solution Approach 1:
The base station performs preliminary channel reservation by transmitting a first signal before allowing multiple UEs to access the channel. This preliminary action establishes clear channel ownership and timing parameters, preventing allocation conflicts between multiple UEs while maintaining high system capacity through efficient configured-grant resource sharing.
Data Source
AI summary
A user equipment (UE) may transmit a configured-grant uplink control information (CG-UCI) to a base station during a channel occupancy time (COT) initiated by the UE in a shared spectrum, the CG-UCI comprising COT sharing information, the COT sharing information indicating, at least, an index value corresponding to a combination of: an indication of an offset to a beginning of a downlink transmission opportunity during the COT; an indication of a duration of the downlink transmission opportunity during the COT; and an indication of a channel access priority class (CAPC) value used by the UE to initiate the COT. The base station may transmit a downlink transmission to the UE within the downlink transmission opportunity and in accordance with the COT sharing information in the transmitted CG-UCI. Apparatuses are also disclosed.