UE Capability Reporting for Maximum MIMO Layers in Multi-TRP Uplink
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Solution Overview
Problem
Existing wireless communication systems lack an effective mechanism for reporting and interpreting user equipment capabilities on the maximum number of supported layers for uplink communication with multiple transmission reception points (TRPs).
Innovation Solution
The method involves repurposing a legacy parameter for a single TRP to report user equipment capabilities for multiple TRPs, or introducing a new parameter specifically designed for multiple TRP scenarios, allowing accurate interpretation of the maximum number of MIMO uplink layers supported by the user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a legacy parameter designed for single TRP communication is reused for multiple TRP scenarios, then device complexity is reduced and ease of operation is improved, but measurement precision and reliability of capability reporting deteriorate due to ambiguous interpretation
Solution Approach 1:
The patent changes the interpretation of the existing layer parameter based on the TRP scenario. When multiple TRPs are detected, the parameter interpretation switches from indicating total layers to indicating layers per TRP, resolving the ambiguity while reusing the same parameter structure
Solution Approach 2:
Instead of creating a new parameter for multiple TRP scenarios (which would increase complexity), the patent inverts the interpretation logic: the same parameter serves different meanings based on whether single or multiple TRPs are involved, turning a potential limitation into a flexible solution
2Measurement precision
If a new parameter is introduced specifically for multiple TRP scenarios, then measurement precision and reliability of capability reporting are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The existing layer parameter is made universal to serve both single TRP and multiple TRP scenarios. The parameter maintains the same structure and transmission mechanism but adapts its meaning based on the communication context, eliminating the need for separate parameters
Solution Approach 2:
The patent merges the capability reporting function for single TRP and multiple TRP scenarios into a single parameter framework. By combining the interpretation logic rather than creating separate parameters, the system reduces signaling overhead while maintaining precision
3Ease of operation
If the layer parameter is interpreted as total layers across all TRPs, then ease of operation is improved, but productivity and scheduling efficiency deteriorate due to inability to determine per-TRP layer allocation
Solution Approach 1:
The patent segments the total layer capability into per-TRP allocations by changing the parameter interpretation. Instead of reporting a single total number, the system interprets the parameter as indicating layers available per TRP, enabling the gNB to efficiently allocate resources to each TRP independently
Solution Approach 2:
The parameter interpretation becomes dynamic based on the number of TRPs involved in communication. The same parameter value can represent different absolute layer allocations depending on whether one or multiple TRPs are active, allowing flexible and efficient scheduling
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment (UE). For example, the UE may transmit, to a plurality of transmission and reception points (TRPs), a layer parameter based on a maximum number of multiple input multiple output (MIMO) uplink layers that are supported by the UE for uplink communication to the plurality of TRPs. The UE may receive, from at least one TRP of the plurality of TRPs, uplink scheduling information responsive to transmitting the layer parameter. The UE may further transmit, to each of the plurality of TRPs, a physical uplink shared channel (PUSCH) communication according to the uplink scheduling information.