PRACH Power Control via Beam-Level Path Loss Segmentation
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Solution Overview
Problem
The existing power control solutions for Physical Random Access Channel (PRACH) in New Radio (NR) systems are less accurate due to multiple subcarrier spacings and beam changes during random access attempts, leading to reduced access probability and increased interference with other devices.
Innovation Solution
A method for PRACH power control that determines transmission power based on a terminal device's power constraint, target transmission power, and downlink path loss on a beam level, with configuration parameters transmitted on a beam level to improve accuracy and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LTE power control solution is used in NR system, then implementation is simple, but measurement precision and access probability are reduced due to multiple subcarrier spacings and beam changes
Solution Approach 1:
The patent segments the power control process into beam-level operations. Instead of treating the cell as a single unit, the system divides power control measurements and calculations into individual beam segments (beam 0, beam 1, etc.), each with its own path loss measurements and power determinations. This segmentation enables precise power control for each beam while maintaining overall system simplicity.
Solution Approach 2:
The patent applies local quality by configuring power control parameters specifically for each beam rather than using uniform cell-level parameters. Each beam can have its own preamble received target power, path loss measurements, and power control adjustments tailored to its specific propagation conditions, thereby improving measurement precision without complicating the overall implementation.
2Ease of manufacture
If LTE power control solution is used in NR system, then implementation is simple, but access probability is reduced due to reduced accuracy
Solution Approach 1:
By segmenting power control into beam-level operations, the system can independently optimize each beam's power settings based on its specific channel conditions. This improves access probability for each beam while maintaining the overall simplicity of the LTE-based framework, as each segment operates autonomously within the established protocol.
Solution Approach 2:
The patent changes power control parameters at the beam level, allowing each beam to have customized preamble received target power values, path loss measurements, and power adjustments. These parameter changes enable the system to adapt to varying beam conditions, improving access probability without requiring a complete redesign of the power control mechanism.
3Reliability
If beam-level power control is implemented, then access probability is improved, but device complexity increases
Solution Approach 1:
The patent manages device complexity by segmenting power control into standardized beam-level units. Each beam follows the same measurement and calculation procedures, allowing the terminal device to reuse existing power control logic with minimal modifications. This modular approach improves access probability while keeping device complexity manageable through systematic repetition of proven algorithms.
Solution Approach 2:
The patent achieves beam-level power control using universal power control algorithms that can function at both cell-level and beam-level. The same basic power control mechanism used in LTE is extended to support multiple beams, allowing a single set of device components to handle both traditional and enhanced scenarios without requiring separate specialized hardware or software for each beam.
4Object-generated harmful factors
If beam-level power control is implemented, then interference is reduced, but configuration complexity increases
Solution Approach 1:
The patent reduces interference by segmenting power control configurations into beam-specific parameters. Each beam can be configured with appropriate power levels and timing adjustments to minimize interference with other beams and devices. The network device manages these segmented configurations systematically, reducing overall interference while keeping configuration complexity organized and manageable through structured parameter groups.
Data Source
AI summary
Embodiments of the present disclosure relate to a method, terminal device and apparatus for physical random access channel (PRACH) power control and a method, network device and apparatus for transmitting parameters of PRACH power control. In an embodiment of the present disclosure, the method of PRACH power control may comprise determining a transmission power of PRACH preamble based on a power constriction of a terminal device, a preamble received target transmission power and a downlink path loss on a beam level. With embodiments of the present disclosure, it could provide a power control for PRACH with improved accuracy, which increases the success possibility of random access attempt and interferences to other devices.