Sidelink Unlicensed COT Sharing for Grant-Free Scheduling Requests
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently sharing channel occupancy time (COT) between devices in sidelink unlicensed operations, leading to inefficiencies and interference in channel access.
Innovation Solution
A mechanism where a first wireless device receives a COT sharing indication from a second wireless device, allowing it to transmit an uplink signal within the shared COT without a sidelink grant, thereby optimizing channel access and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a device performs channel access procedures in sidelink unlicensed operations, then channel occupancy time is established, but interference and inefficiency occur when multiple devices need to share the channel
Solution Approach 1:
The patent segments the channel occupancy time by introducing a COT sharing indication that divides the channel access rights between the first wireless device and second wireless device. This segmentation allows multiple devices to operate within the same COT without causing harmful interference, directly resolving the contradiction between maintaining channel occupancy and reducing interference.
2Productivity
If a device requires a sidelink grant for each transmission, then channel access control is maintained, but transmission efficiency and responsiveness are reduced
Solution Approach 1:
The patent applies preliminary action by establishing COT sharing indication in advance through MAC CE or RRC signaling before actual transmissions occur. This pre-configuration allows devices to transmit uplink signals without requiring individual sidelink grants during the shared COT, thereby improving transmission efficiency while maintaining controlled access through the pre-established sharing rules.
3Measurement precision
If COT sharing indication is transmitted frequently to maintain synchronization, then channel sharing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements periodic action by configuring COT sharing indication to be transmitted at specific intervals or under specific conditions rather than continuously. The MAC CE or RRC signaling establishes periodic update mechanisms that maintain synchronization accuracy while minimizing unnecessary signaling overhead, allowing devices to share the channel effectively without constant re-synchronization messages.
Data Source
AI summary
A first wireless device receives, from a second wireless device, a channel occupancy time (COT) sharing indication indicating: a starting time of a COT, and a duration of the COT. The first wireless device triggers transmission of an uplink signal based on no sidelink grant, for a sidelink transmission, being within the duration of the COT starting from the starting time. The first wireless device transmits, to a base station and based on triggering the transmission of the uplink signal, the uplink signal indicating a scheduling request of one or more sidelink grants within the duration of the COT.