Beam-Based Channel Access Using Shared COT Without LBT
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Solution Overview
Problem
Wireless devices constrained by wide directional beams frequently need to perform listen-before-talk (LBT) or long-term sensing procedures, limiting their ability to support ultra-reliable low latency communication (URLLC) services due to increased latency and interference.
Innovation Solution
Wireless devices can share a channel occupancy time (COT) of another device without performing LBT if they use a directional beam that fails to satisfy a narrow beam condition but meets specific time gap or duration criteria, allowing for reduced latency and higher data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices perform LBT or long-term sensing procedures to ensure reliable channel access, then channel access reliability is improved, but transmission latency increases and data rates decrease
Solution Approach 1:
The patent applies preliminary action by establishing channel occupancy time (COT) sharing arrangements in advance, where a first wireless device can transmit during the COT of a second device without performing LBT. This pre-arranged channel access mechanism eliminates the need for real-time sensing procedures, thereby reducing transmission latency while maintaining reliable channel access through predetermined rules.
Solution Approach 2:
The patent uses channel occupancy time (COT) as an intermediary mechanism that mediates between conflict avoidance (through LBT) and efficient transmission. By introducing COT sharing as an intermediate solution, devices can access channels without full LBT procedures while still maintaining structured channel management, thus reducing latency without completely abandoning reliability mechanisms.
2Object-affected harmful factors
If wireless devices perform LBT or long-term sensing procedures to minimize interference, then interference reduction is improved, but spectral efficiency and data rates worsen
Solution Approach 1:
The patent applies preliminary action by pre-establishing channel occupancy time (COT) sharing arrangements that define transmission parameters in advance. This allows devices to transmit without performing LBT or sensing procedures, eliminating the time loss associated with these interference-checking mechanisms while maintaining structured interference management through predetermined COT rules, thereby improving spectral efficiency.
Solution Approach 2:
The patent extracts the essential interference management function from the LBT/sensing procedure bundle. By separating the channel access decision from real-time sensing and using pre-arranged COT sharing instead, the system removes the harmful time delay and interference with other transmissions caused by LBT procedures, while retaining interference control through structured COT allocation.
3Area of stationary object
If wireless devices use wide directional beams to improve coverage, then coverage area is improved, but beam width increases causing more interference and requiring LBT procedures
Solution Approach 1:
The patent applies preliminary action by pre-arranging channel occupancy time (COT) sharing between devices using wide directional beams. This advance arrangement allows devices to transmit without performing LBT procedures, compensating for the increased interference potential of wide beams through predetermined channel access rules rather than real-time sensing, thus maintaining coverage while reducing access latency.
4Ease of operation
If wireless devices perform LBT or long-term sensing procedures to ensure fair channel access, then channel access fairness is improved, but transmission speed and latency performance worsen
Solution Approach 1:
The patent applies preliminary action by establishing channel occupancy time (COT) sharing arrangements in advance, where fairness rules are predetermined. This allows devices to access channels without real-time LBT procedures, maintaining fair access through pre-negotiated COT allocation while eliminating the speed penalty associated with performing sensing procedures before each transmission.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for channel occupancy sharing conditions for beam-based channel access. In some aspects, one or more wireless devices may support a beam-based channel access procedure according to which a first wireless device may share a channel occupancy time (COT) of a second wireless device without performing a listen-before-talk (LBT) procedure if one or more conditions associated with a transmission from the first wireless device are satisfied. Such conditions may be associated with whether a directional beam used by the first wireless device satisfies a narrow beam condition, a time gap between a transmission from the second wireless device and a transmission from the first wireless device, or a duration of a continuous transmission from the first wireless device, or any combination thereof.