Uplink Resource Grouping for Multi-TRP Spatial Relation Configuration
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Solution Overview
Problem
The 5G New Radio (NR) multi-TRP functionality is not supported in certain scenarios where default spatial relation and pathloss reference signals are not configured, limiting the ability of user equipment (UE) to maintain multiple links with multiple TRPs on the same carrier.
Innovation Solution
The UE divides uplink resources into groups and determines a spatial relation and pathloss reference signal for each group based on a transmission configuration indication (TCI) indicating a quasi-co-location (QCL) source reference signal for the downlink channel, allowing simultaneous transmission to multiple gNBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If default spatial relation and pathloss reference signals are used, then the configuration is simple, but multi-TRP operation is not supported
Solution Approach 1:
The patent segments uplink resources into multiple groups, where each group is associated with a specific TRP. This segmentation allows the system to maintain multiple spatial relations and pathloss reference signals simultaneously, enabling multi-TRP operation while keeping the configuration manageable through structured organization
Solution Approach 2:
The patent applies local quality by configuring different spatial relation and pathloss reference signal parameters for different uplink resource groups. Each group can have TRP-specific parameters tailored to its associated transmission point, allowing optimized local configurations while maintaining overall system coordination
2Adaptability or versatility
If TRP-specific default parameters are configured, then multi-TRP support is enabled, but the parameters cannot be shared across multiple TRPs
Solution Approach 1:
The patent creates a universal parameter configuration framework where spatial relation and pathloss reference signal parameters can serve multiple functions. By associating parameters with uplink resource groups rather than individual TRPs directly, the same parameter set can be reused across different TRP scenarios, reducing overall configuration complexity while maintaining multi-TRP capability
3Productivity
If multiple spatial relations and pathloss reference signals are configured for multi-TRP, then simultaneous transmission to multiple gNBs is enabled, but the configuration and management becomes complex
Solution Approach 1:
By dividing uplink resources into distinct groups associated with different TRPs, the patent simplifies the management of multiple spatial relations and pathloss reference signals. Each group can be independently configured and managed, making the overall complex configuration more tractable through modular organization
Solution Approach 2:
The patent introduces uplink resource groups as an intermediary layer between the UE and multiple TRPs. This intermediary structure simplifies configuration management by providing a structured interface that abstracts the complexity of direct multi-TRP parameter management, allowing systematic configuration and updating of parameters
Data Source
AI summary
A user equipment (UE) in a multiple transmission and reception point (multi-TRP) configuration having simultaneous connections with a first next generation node B (gNB) and at least one second gNB over a same carrier. The UE divides uplink (UL) resources into a plurality of groups, determines a spatial relation and a pathloss reference signal (RS) for each one of the plurality of groups based on a transmission configuration indication (TCI) indicating a quasi-co-location (QCL) source RS for a downlink channel and transmits UL data on the UL resources corresponding to each one of the plurality of groups to a respective one of the first gNB or the at least one second gNB.