Aligned Sidelink Channel Acquisition via Receiving UE Feedback
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Solution Overview
Problem
Current sidelink communication technologies in unlicensed bands face challenges with channel access failures due to interference, particularly in scenarios where UEs cannot acquire the channel using Listen Before Talk (LBT) mechanisms, leading to congestion and disrupted communication sessions.
Innovation Solution
A method where a receiving UE device monitors for receipt of a transmission and acquires the channel for a sidelink communication session, enabling it to aid the transmitting UE device by sharing Channel Occupancy Time (COT) information, allowing the transmitting device to retry the LBT process, thereby ensuring channel access through Listen Before Talk protocols, even in cases of initial failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitting UE uses LBT mechanism to acquire channel access, then channel access is enabled, but channel acquisition may fail due to interference and congestion
Solution Approach 1:
The receiving UE sends feedback information to the transmitting UE about the channel access outcome. When the transmitting UE's LBT fails, the receiving UE provides feedback that enables the transmitting UE to retry the LBT process with updated channel state information, thereby improving channel access reliability under interference conditions
Solution Approach 2:
The receiving UE autonomously monitors the channel and acquires channel occupancy time without requiring the transmitting UE to successfully complete LBT. This self-service mechanism allows the receiving UE to independently ensure channel access for the communication session, compensating for the transmitting UE's LBT failure
2Reliability
If a transmitting UE fails to acquire channel through LBT, then communication is disrupted, but enabling retry mechanisms increases communication complexity
Solution Approach 1:
The receiving UE performs preliminary monitoring of the channel and prepares to acquire channel occupancy time in advance. By pre-positioning the receiving UE in a state ready to acquire the channel, the system can quickly respond to transmitting UE LBT failures without requiring complex real-time decision-making procedures
Solution Approach 2:
The receiving UE acts as an intermediary that bridges the gap when the transmitting UE's LBT fails. Instead of the transmitting UE directly handling the complexity of retry mechanisms, the receiving UE mediates by monitoring the channel and providing feedback, thereby simplifying the overall channel access procedure
3Reliability
If receiving UE monitors and acquires channel for aligned sidelink communication, then communication reliability is enhanced, but additional monitoring and feedback procedures increase operational complexity
Solution Approach 1:
The channel monitoring and acquisition functions are merged between the transmitting and receiving UEs. Both UEs perform LBT procedures and channel acquisition as part of a unified aligned sidelink communication mechanism, distributing the operational complexity across both devices rather than placing the entire burden on the transmitting UE
Data Source
AI summary
In some examples, a method of wireless communication by a user equipment, UE, comprises receiving configured grant, CG, configuration data at a first UE, the CG configuration data comprising bi-directional CG information for an aligned sidelink communication session between the first UE and a second UE, monitoring for receipt of a first transmission of the communication session at the first UE, and on the basis of the monitoring, acquiring the channel for the sidelink communication session at the first UE.