Multi-TRP PUCCH Resource Coordination for Collision Avoidance
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Solution Overview
Problem
Multi-TRP transmissions in NR deployments face communication issues due to scheduling collisions and timing alignment challenges, particularly with different TRPs having distinct timing advance controls, leading to potential overlaps in PUCCH resources during simultaneous UL transmissions.
Innovation Solution
The proposed solution involves coordinating channel resource configurations between network nodes to avoid collisions by using timing advance information and scheduling PUCCH resources in a TDM manner, where the UE maintains separate TA control loops for each TRP, and reports timing differences to align resource allocation, ensuring non-overlapping transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate TA control loops are maintained for each TRP to enable independent timing control, then timing alignment capability is improved, but device complexity increases due to multiple control loops
Solution Approach 1:
The patent divides the timing control function into separate TA control loops for each TRP. The UE maintains independent TA values (TA1 for TRP1, TA2 for TRP2) and applies them separately to PUCCH transmissions to different TRPs, enabling precise timing alignment with each TRP while keeping the control loops modular and manageable
Solution Approach 2:
The patent introduces dynamic timing adjustment by allowing the UE to selectively apply different TA values based on which TRP is being transmitted to. The UE can switch between TA1 and TA2 depending on the target TRP, and the network can dynamically configure which TA value to use for specific PUCCH resources, providing flexible and adaptive timing control
2Productivity
If PUCCH resources are allocated independently by each TRP to maximize resource utilization, then resource efficiency is improved, but collision probability increases between simultaneous UL transmissions
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors PUCCH resource usage and timing alignment status, and adjusts TA values and resource allocations accordingly. The UE reports timing difference measurements back to the network, enabling the network to coordinate resource allocation between TRPs to avoid collisions while maintaining high utilization
Solution Approach 2:
The patent changes the timing parameter by introducing configurable timing offsets between PUCCH transmissions to different TRPs. The network can adjust the timing relationship between PUCCH resources associated with different TRPs, dynamically changing transmission parameters to prevent overlaps while maximizing resource usage
3Reliability
If TDM scheduling is applied to PUCCH resources to avoid collisions, then transmission reliability is improved, but time resource flexibility decreases
Solution Approach 1:
The patent makes the TDM scheduling dynamic by allowing flexible configuration of TDM patterns through higher-layer signaling. The network can adaptively switch between different TDM configurations based on traffic conditions, UE capabilities, and channel states, maintaining reliability while preserving time resource flexibility for different service requirements
Data Source
AI summary
In accordance with an example embodiment of the present invention, a method comprising: receiving, by a user equipment from a network node, an indication of configured channel resources for use by the user equipment in communication with the network node and at least one other network node of a communication network, wherein the configured channel resources are channel resources configured in coordination with the network node and the at least one other network node; and using, by the user equipment, the channel resources to at least avoid collisions during the communication with the network node and the at least one other network node.