Pre-Grant Resource Collision Avoidance in Multi-TRP Uplink
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Solution Overview
Problem
In multi-TRP architectures for wireless communication systems like 5G NR, the lack of cooperation and coordination between transmission and reception points (TRPs) leads to collisions, resulting in wasted resources due to overlapping resource allocations for uplink transmissions, which existing technologies fail to effectively avoid without significant additional cooperation and signaling overhead.
Innovation Solution
A method and apparatus that utilize pre-grant indications of resource allocations, allowing wireless devices to provide feedback on accepted resources, enabling TRPs to adjust and avoid collisions even without real-time coordination, by using a single-DCI or two-DCI format for pre-grant signaling to identify conflicts and optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple TRPs independently allocate uplink resources without coordination, then each TRP can autonomously manage its resources, but resource collisions occur leading to wasted resources
Solution Approach 1:
The patent applies preliminary action by introducing a pre-grant indication mechanism where TRPs send preliminary resource allocation indications to the wireless device before final grant confirmation. The wireless device provides feedback on these pre-grants, allowing TRPs to detect potential collisions in advance and adjust allocations before actual resource transmission, thus preventing resource wastage while maintaining autonomous operation.
2Productivity
If TRPs implement real-time coordination to avoid resource collisions, then resource allocation efficiency improves, but signaling overhead and system complexity increase significantly
Solution Approach 1:
The patent uses the wireless device as an intermediary to facilitate coordination between multiple TRPs. Instead of requiring direct real-time communication between TRPs, the wireless device receives pre-grant indications from multiple TRPs, provides feedback about resource conflicts and acceptability, enabling TRPs to coordinate resource allocations indirectly through the device's feedback mechanism, thus reducing system complexity while improving allocation efficiency.
3Reliability
If TRPs send detailed coordination signals to avoid collisions, then resource collision avoidance improves, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential collision detection function from complex coordination signaling by implementing a feedback mechanism where the wireless device simply indicates whether it can accept or reject pre-grant resource allocations. This extracted feedback mechanism provides sufficient collision avoidance information without requiring extensive coordination signals between TRPs, thus maintaining high collision avoidance reliability while minimizing signaling overhead.
Data Source
AI summary
The apparatus may be associated with at least a first TRP (or wireless device) and may be configured to transmit (or receive) a first indication indicating a potential grant of resources for an uplink (UL) transmission for at least one wireless device. The apparatus may further be configured to receive (or transmit) a feedback indicating that the potential grant of the resources is accepted by a wireless device of the at least one wireless device. The apparatus may also be configured to at least one of transmit (or receive) a second indication indicating a grant of the resources for the UL transmission for the wireless device of the at least one wireless device, or receive (or transmit) the UL transmission via the resources indicated in the first indication or the second indication.