Multi-TRP Power Control for Unsignaled Uplink Parameters
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) may lack power control parameters for transmission configuration indicator (TCI) states associated with multiple transmission and reception points (TRPs), leading to unclear transmission settings.
Innovation Solution
A default power control parameter scheme is employed by the UE to determine power control parameters for transmissions to TRPs when signaled parameters are absent, allowing for consistent communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network does not signal power control parameters for all TCI states, then signaling overhead is reduced, but the UE lacks clear transmission settings for certain TRPs
Solution Approach 1:
The network pre-configures default power control parameters for multiple TCI states before multi-TRP operation begins. When the network does not signal parameters for a specific TCI state, the UE can immediately use the pre-configured default parameters without interruption, ensuring transmission reliability while minimizing signaling overhead.
Solution Approach 2:
The patent uses lightweight default power control parameters that can be quickly applied when signaling is absent. These default parameters serve as temporary substitutes until explicit signaling is received, allowing the system to function reliably without requiring comprehensive signaling for all scenarios.
2Device complexity
If the UE uses a single set of power control parameters for multiple TRPs, then parameter management is simplified, but transmission performance to individual TRPs cannot be optimized
Solution Approach 1:
The patent segments power control parameters by associating different default parameter sets with different TCI states. Each TCI state can have its own dedicated default power control parameters, allowing the UE to select appropriate parameters for each TRP while maintaining manageable complexity through the TCI state framework.
Solution Approach 2:
The default power control parameters are designed to be universally applicable across multiple TCI states and TRPs. A single default parameter set can serve multiple purposes and be reused across different transmission scenarios, simplifying management while maintaining flexibility for TRP-specific optimization when needed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In an absence of signaled uplink power control parameters for either of a first transmission configuration indicator (TCI) state associated with a first transmission and reception point (TRP) or a second TCI state associated with a second TRP, a user equipment (UE) communicating with the first TRP and the second TRP may select at least one of a first set of power control parameters associated with the first TRP or a second set of power control parameters associated with the second TRP in accordance with a default uplink power control parameter scheme. The UE may perform a first transmission to the first TRP in accordance with the first set of uplink power control parameters and a second transmission to the second TRP in accordance with the second set of uplink power control parameters.