Sidelink COT Resumption via Partial Message Validation
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Solution Overview
Problem
In wireless communications systems, devices sharing a channel occupancy time (COT) face increased latency and loss of access due to the requirement to fully decode messages and perform a new channel access procedure before resuming transmissions, which can be interrupted by other devices gaining access.
Innovation Solution
Wireless devices validate 'expected' messages received within reserved resources and perform channel access procedures without full decoding, allowing efficient resumption of transmissions within the COT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices fully decode messages and perform a new channel access procedure before resuming transmissions, then transmission reliability is improved, but latency increases and access is lost
Solution Approach 1:
The patent applies partial action by validating only the critical 'expected' messages (such as feedback messages or control information) rather than fully decoding all received messages. This partial validation approach allows the device to confirm essential transmission status without the time-consuming process of complete message decoding, thereby reducing latency while maintaining sufficient reliability to resume transmissions.
Solution Approach 2:
The patent implements preliminary action by performing channel access procedures and validating expected messages in advance before attempting to resume transmissions. The device pre-validates critical message indicators and prepares channel access procedures beforehand, allowing for faster resumption without needing to perform full decoding and access procedures sequentially after interruption.
2Reliability
If devices perform a new channel access procedure before resuming transmissions, then access rights are maintained, but other devices may steal the COT
Solution Approach 1:
The patent applies preliminary action by having the reserving device perform channel access procedures and validate expected messages in advance before resuming transmissions. This pre-prepared state ensures that when the device needs to resume, it can do so efficiently without being intercepted by other devices, thereby maintaining access rights while improving throughput by eliminating unnecessary delays.
Solution Approach 2:
The patent utilizes feedback mechanisms where the reserving device validates expected feedback messages or control information received during the shared COT. This feedback validation confirms that the reserving device still holds the necessary access rights and transmission opportunities, allowing it to resume transmissions confidently without risking COT theft, thus maintaining both access rights and productivity.
3Loss of time
If devices validate expected messages without full decoding, then latency is reduced, but message validation completeness may be compromised
Solution Approach 1:
The patent extracts only the critical validation information from the full messages, focusing on validating specific expected message indicators, feedback signals, or control information that are sufficient to confirm transmission status. By extracting only these essential validation elements rather than processing the complete message content, the system achieves low-latency validation while maintaining sufficient completeness for reliable transmission resumption.
Solution Approach 2:
The patent applies partial action by implementing message validation that goes beyond mere formal acknowledgment but stops short of full decoding. The device validates critical expected messages to sufficient precision to confirm transmission status and resume rights, without the excessive time consumption of complete message processing. This partial validation approach achieves the right balance between validation completeness and latency reduction.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) performs a first channel access procedure for accessing a channel occupancy time (COT) within the sidelink channel. The UE transmits a second-stage sidelink control information (SCI) message (SCI-2) including COT sharing information (COT-SI) for sharing the COT with other devices, and transmits a first sidelink message within a first portion of the COT. The UE identifies a second sidelink message that is expected to be received within a second portion of the COT, and performs a second channel access procedure for accessing the COT after identifying the second sidelink message based on the second sidelink message being expected within a set of resources reserved for the second sidelink message. Subsequently, the UE transmits a third sidelink message within a third portion of the COT based on a completion of the second channel access procedure.