Continuous Multi-Link Communication in Unlicensed Spectrum
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Solution Overview
Problem
In communications within the unlicensed spectrum, existing technologies face challenges such as increased latency due to the need for devices to scan for available channels before transmission, and rules governing scanning frequency to prevent interference, leading to potential discontinuities in communication when channel occupancy times expire.
Innovation Solution
A non-access point apparatus is configured for multi-link communication by setting a subfield in a multi-link element within an association or reassociation request to enable continuous multi-link mode operation, allowing for ongoing channel acquisition and reduced latency through existing signaling mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If scanning procedures such as listen before talk LBT are used prior to transmitting a signal, then interference is reduced, but latency is increased
Solution Approach 1:
The system performs scanning and channel acquisition in advance before transmission is needed. The first apparatus acquires a channel for a channel occupancy time (COT) and stores it for future use, so that when data needs to be transmitted, the channel is already ready and no scanning is required at transmission time, thus reducing latency while maintaining interference reduction benefits
Solution Approach 2:
The system maintains continuous channel occupancy by having the first apparatus acquire and hold a channel for a predetermined COT, ensuring that communication can continue without interruption. This continuous action eliminates the need for repeated scanning procedures, reducing latency while maintaining interference management
2Reliability
If devices scan frequently to acquire channels, then channel availability is improved, but spectrum sharing fairness deteriorates
Solution Approach 1:
The first apparatus performs channel scanning and acquisition in advance, storing the acquired channel for future communications. This preliminary action ensures channel availability is improved without requiring frequent scanning that would disrupt spectrum sharing fairness, as the channel is secured once and reused
Solution Approach 2:
The first apparatus acts as an intermediary that secures a channel in advance and makes it available to the second apparatus when needed. This mediator approach ensures that the second apparatus can communicate reliably without needing to scan itself, thus maintaining spectrum sharing fairness while ensuring channel availability
3Duration of action of stationary object
If channel occupancy time is extended, then communication continuity is improved, but channel acquisition flexibility deteriorates
Solution Approach 1:
The first apparatus acquires a channel for a predetermined channel occupancy time (COT) in advance, ensuring continuous communication is available. The COT is set to cover the expected communication duration, eliminating the need for frequent re-scanning while maintaining the ability to adapt if new communication needs arise within the COT period
Data Source
AI summary
A non-access point apparatus may communicate in a continuous or near continuous mode with an access point apparatus. To initiate this mode the non-access point apparatus may indicate to the access point apparatus that continuous multi-link mode operation is to be enabled by setting a subfield in a multi-link element within an association or reassociation request to a predetermined value. This request may then be transmitted to the access point apparatus, which if it supports such a mode may indicate this in a response.