Uplink RACH Power Control via Dynamic Beam Gain
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Solution Overview
Problem
Existing random access channel (RACH) power control mechanisms based on fixed omnidirectional or fixed receive beam transmission are not precise enough, especially when receive beams rapidly change, affecting the access success rate of uplink RACH.
Innovation Solution
The method involves a network side device sending power offset information to UE, which adjusts the transmit power based on changes in beamforming gains, using multiple power offset terms and indices to determine accurate transmit power for uplink channels or signals, thereby dynamically controlling transmit power and improving access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed omnidirectional antenna transmission or fixed receive beam transmission is used for RACH power control, then the power control mechanism is simple to implement, but the power control precision is insufficient when receive beams rapidly change
Solution Approach 1:
The patent applies dynamics by transitioning from fixed omnidirectional antenna transmission or fixed receive beam transmission to dynamic receive beam switching. The base station performs adaptive switching on the receive beams based on quality of receiving the preamble, polling a plurality of candidate receive beams to select an optimal receive beam. This dynamic adaptation allows the system to maintain precise power control despite rapid changes in receive beams.
Solution Approach 2:
The patent applies parameter changes by introducing beam-specific power control parameters. Different receive beams are corresponding to different beamforming gains, different target receive powers, and different power control parameters. The base station configures multiple power control parameter sets, each corresponding to a different receive beam, allowing precise power control adaptation when receive beams change rapidly.
2Adaptability or versatility
If the base station polls multiple candidate receive beams to select an optimal receive beam, then the receive beam adaptability is improved, but the power control accuracy deteriorates due to rapid beam changes
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple power control parameter sets at the base station, where each set corresponds to a different receive beam. The base station sends these multiple power control parameter sets to the UE in advance. When the base station performs adaptive switching on the receive beams, the UE can immediately use the pre-configured corresponding power control parameters, avoiding delays and maintaining power control accuracy during rapid beam changes.
Solution Approach 2:
The patent applies feedback by establishing a closed-loop mechanism where the base station evaluates the quality of receiving the preamble on different receive beams and performs adaptive switching based on this feedback. The base station polls multiple candidate receive beams, selects the optimal receive beam based on reception quality feedback, and the UE adjusts its transmit power accordingly using the corresponding pre-configured power control parameters.
Data Source
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AI summary
This application provides an uplink power control method and apparatus. A network side device sends a plurality of pieces of configuration information of an RACH to UE, and indicates, by using a scheduling message of the RACH, identifier information of the configuration information of the RACH used by the UE. The UE calculates a transmit power of the RACH based on the configuration information that is of the RACH and that is corresponding to the identifier information, and sends a random access preamble to the network side device based on the transmit power of the RACH. Each piece of configuration information of the RACH is corresponding to a receive beam of the network side device or a transmit beam of the UE, so that the network side device can dynamically adjust the transmit power of the RACH based on changes in beamforming gains of different receive beams or transmit beams, to precisely control the transmit power of the RACH and improve an access success rate of an uplink RACH.