Uplink Power Control via Spatial Relation Configuration
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Solution Overview
Problem
In current uplink transmission, when the network device fails to reconfigure the power control parameter for the terminal device in time, the terminal device uses an inaccurate power control parameter, leading to interference or limited coverage for the PUSCH or SRS.
Innovation Solution
The network device transmits configuration information to the terminal device, which includes target spatial relation information for the uplink data. The terminal device then determines the transmit power based on this information, allowing it to directly obtain the target power control parameter without waiting for network reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device does not reconfigure the power control parameter in time, then the terminal device can continue using the previously configured parameter (maintaining system simplicity), but the transmit power becomes inaccurate causing interference or limited coverage (worsening transmission quality)
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple power control parameters (first power control parameter, second power control parameter, etc.) corresponding to different spatial relation information before the terminal needs to switch beams. When beam switching occurs, the terminal can directly select the pre-configured power control parameter matching the new spatial relation, eliminating the need for real-time reconfiguration signaling and ensuring accurate transmit power immediately.
2Measurement precision
If the network device reconfigures the power control parameter whenever spatial relation changes, then accurate power control is achieved, but signaling overhead and reconfiguration delay increase
Solution Approach 1:
The network device pre-configures multiple power control parameters in advance, each associated with specific spatial relation information. This preliminary configuration allows the terminal to immediately access the correct power control parameter when beam switching occurs, eliminating reconfiguration delay and signaling overhead while maintaining accurate power control.
Solution Approach 2:
The patent uses copying by creating multiple copies of power control parameters (first power control parameter, second power control parameter, etc.) corresponding to different spatial relations. Instead of modifying a single parameter through reconfiguration, the system maintains multiple pre-copied parameters that can be directly selected, reducing signaling overhead and time delay.
3Ease of operation
If the terminal device uses the previously configured power control parameter after beam switching, then system operation is simple, but the transmit power becomes inaccurate leading to interference with other terminals
Solution Approach 1:
The system pre-configures multiple power control parameters corresponding to different spatial relation information before beam switching occurs. When the terminal switches beams, it can directly select the pre-configured parameter matching the new spatial relation without complex reconfiguration procedures, maintaining operational simplicity while preventing interference through accurate power control.
Data Source
AI summary
A power control method and a device are provided. The method is applied to a terminal device. The method includes: receiving configuration information from a network device, where the configuration information is used to indicate target spatial relation information of target uplink data; and determining transmit power of the target uplink data based on the target spatial relation information, where the target spatial relation information includes at least one of the following: M power control parameters, a target power control parameter corresponding to the target spatial relation information, and information used to indicate the target power control parameter, where M is a positive integer; and the target uplink data includes a sounding reference signal SRS or a physical uplink shared channel PUSCH.