Uplink Power Control Parameter Determination After Beam Failure Recovery
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Solution Overview
Problem
Existing technologies face challenges in determining the appropriate physical uplink channel power control parameter values after a beam failure recovery, leading to potential delays in establishing the correct power adjustment levels.
Innovation Solution
The method involves determining whether to use a default power control parameter value or a value associated with a previously known uplink spatial relation configuration for PUCCH and PUSCH transmissions after successful beam failure recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new initial power adjustment level value is established after beam failure recovery, then reliability of the recovered connection is improved, but time delay increases
Solution Approach 1:
The patent applies preliminary action by determining power control parameter values based on previously known uplink spatial relation configurations before the beam failure recovery is complete. By using stored power control parameters from prior successful transmissions in the same spatial relation, the system prepares the power adjustment level in advance rather than establishing it from scratch after recovery, thus reducing the time delay while maintaining reliability
Solution Approach 2:
The patent applies copying by using power control parameter values from previously known uplink spatial relation configurations that are copied from historical data. Instead of performing a complete iterative measurement process after beam failure recovery, the system copies relevant power control parameters from prior configurations with the same spatial relation, significantly reducing the time required to establish reliable power levels while maintaining connection reliability
2Loss of time
If a default power control parameter value is used after beam failure recovery, then time delay is reduced, but manufacturing precision of power adjustment deteriorates
Solution Approach 1:
The patent applies local quality by selecting power control parameter values specifically matched to the particular uplink spatial relation configuration that was active before beam failure. Rather than using a generic default value for all cases, the system identifies and applies the specific power control parameters associated with the same spatial relation (same downlink reference signal and uplink beam), providing locally optimized precision for each specific spatial configuration while still reducing time delay compared to full iterative processes
3Measurement precision
If iterative process is used to determine power control adjustment state value, then precision of power level determination is improved, but time delay increases
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing power control parameter values for different uplink spatial relation configurations during normal operation. When beam failure recovery occurs, the system retrieves the pre-determined parameters matching the spatial relation rather than initiating a new iterative process, thus maintaining precision while eliminating the time delay associated with iterative determination
Solution Approach 2:
The patent applies copying by copying power control parameter values from previously determined configurations with the same uplink spatial relation. By copying these pre-measured and validated parameters, the system achieves the same measurement precision that would result from a new iterative process, but without the time delay, as the values have already been optimized through prior iterative processes
Data Source
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AI summary
A method and apparatus is provided for determining physical uplink channel power control parameter values for use after a beam failure recovery. A physical random access channel with a spatial domain transmission filter associated with a selected downlink reference signal from a set of downlink reference signals configured for a link recovery is transmitted (202). A determination (204) is made as to whether the selected downlink reference signal is configured for at least one of a set of uplink spatial relation configurations as a reference signal for an uplink spatial relation setting for a physical uplink channel transmission. A power control parameter value for the physical uplink channel transmission is determined. The physical uplink channel is transmitted (210) with the spatial domain transmission filter associated with the selected downlink reference signal and the determined physical uplink channel power control parameter value.