Sidelink Resource Reselection Using Collision Monitoring Reports
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Solution Overview
Problem
In wireless communication systems, devices communicating via sidelink outside the coverage area of a cell face resource selection challenges that can lead to transmission collisions, as there is no base station to assign resources, and existing methods are inefficient in managing collisions and rescheduling transmissions.
Innovation Solution
An apparatus and method for selecting resources from a pool for sidelink communications, requesting monitoring and reporting of transmissions, and determining whether to reschedule based on received monitoring reports, using sidelink control information, collision probability, and quality of service criteria to optimize resource usage and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices select resources autonomously from a pool without base station assignment, then sidelink communications can occur outside coverage area, but transmission collisions occur due to uncoordinated resource selection
Solution Approach 1:
The patent implements a feedback mechanism where monitoring reports are sent from receiving devices to transmitting devices, containing information about detected transmissions and resource usage. This feedback loop enables transmitting devices to adjust their resource selection based on actual channel conditions and collision information, thereby improving transmission reliability while maintaining autonomous operation outside coverage area.
Solution Approach 2:
The patent employs preliminary actions by having devices perform resource selection and transmission scheduling before actual data transmission. Monitoring reports are prepared in advance containing information about resource occupancy and collision probability, allowing transmitting devices to proactively avoid collisions by selecting alternative resources before transmitting, thus improving reliability without sacrificing adaptability.
2Reliability
If monitoring reports are requested and transmitted between devices, then collision detection capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies local quality by making monitoring report functionality optional and context-dependent. Not all devices are required to generate or process monitoring reports at all times; instead, the capability is activated locally based on specific conditions such as being in out-of-coverage area or detecting potential collisions. This selective approach improves collision detection where needed while minimizing the complexity burden on all devices.
3Reliability
If transmissions are rescheduled based on monitoring reports, then resource collision is reduced, but transmission delay increases due to additional scheduling decisions
Solution Approach 1:
The patent uses preliminary action by performing resource selection and rescheduling decisions before actual data transmission based on monitoring reports. Transmitting devices analyze the monitoring reports in advance, identify potential collisions, and select alternative resources proactively. This allows rescheduling to occur with minimal delay, as the decision-making process is completed before the transmission deadline, thus maintaining low latency while achieving collision avoidance.
Solution Approach 2:
The patent implements skipping by enabling transmitting devices to quickly bypass collided resources and select alternative resources from the resource pool. When monitoring reports indicate resource occupancy or collision probability, devices can rapidly skip over problematic time-frequency resources and jump to available alternatives, minimizing the time loss associated with rescheduling while ensuring collision-free transmission.
Data Source
AI summary
To take into account a possible collision during sidelink communications, a transmitter (transceiver) may request one or more other apparatuses (transceivers, receivers) to monitor and report transmissions on sidelink resources at least during a resource received and used by the transmitter for transmission of the data. When one or more monitoring reports are received it is determined whether to reschedule the transmission of the data.