CG-UCI Signaling for Coordinated Downlink Opportunities in COT
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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
1Loss of time
If configured-grant transmission is used in unlicensed spectrum, then latency is reduced and resource utilization is improved, but coordination between uplink and downlink transmissions becomes more complex
Solution Approach 1:
The UE performs COT acquisition and indicates downlink transmission opportunities in advance within the uplink transmission. By preliminarily specifying the timing and duration of downlink opportunities through CG-UCI, the base station can prepare downlink transmissions without real-time coordination delays, thus reducing latency while maintaining manageable complexity
Solution Approach 2:
The CG-UCI acts as an intermediary mechanism that carries COT sharing information from the UE to the base station. This intermediary structure enables coordinated uplink-downlink transmissions by encoding timing delay and duration information, allowing efficient resource allocation without complex direct coordination protocols
2Productivity
If COT sharing is implemented, then resource utilization efficiency is improved, but the complexity of managing transmission opportunities increases
Solution Approach 1:
The patent transforms complex transmission management into manageable parameters by encoding COT sharing information as specific fields in CG-UCI: time delay indication and duration indication. These parameterized representations simplify the management of transmission opportunities while enabling efficient resource utilization through structured information exchange
Solution Approach 2:
The COT sharing information is segmented into distinct components within CG-UCI: the time delay to downlink transmission opportunity and the duration of the opportunity. This segmentation allows independent management and processing of timing and resource allocation aspects, reducing overall system complexity while improving resource utilization efficiency
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.