PRACH Enhanced Transmission Power Control for LTE Terminals
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Solution Overview
Problem
In LTE or LTE-A networks, the existing power calculation method for physical random access channel (PRACH) enhanced transmission leads to power waste in user equipment (UE) due to inefficient determination of transmit power, especially in varying channel environments, resulting in unsuccessful random access processes.
Innovation Solution
A method that determines the transmit power for PRACH enhanced transmission based on level information, including parameters such as preamble initial received target power, path loss, and power ramping step, to accurately adjust power levels for each repetition level, reducing power consumption and improving access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the existing power calculation method is used for PRACH enhanced transmission, then the transmit power can be determined, but power waste occurs in UE due to inefficient power determination
Solution Approach 1:
The patent applies dynamics by making the power calculation method adaptive to different repetition levels. The network device dynamically adjusts the power calculation parameters based on the repetition level indicated by the UE, allowing the transmit power to be optimized for each specific repetition level rather than using a fixed method. This resolves the contradiction by enabling precise power determination that adapts to varying channel conditions and repetition requirements.
Solution Approach 2:
The patent changes the parameter of power calculation by introducing repetition level as a key variable. Different power calculation formulas or parameters are applied depending on the repetition level. This allows the system to transition from a static power determination approach to one that varies systematically with repetition level, reducing power waste while maintaining determination accuracy.
2Reliability
If multiple repetition levels of PRACH enhanced transmission are used, then coverage enhancement can be achieved, but the complexity of power management increases
Solution Approach 1:
The patent segments the power management process by dividing it into distinct repetition levels, where each level has its own power calculation method or parameters. The network device and UE separately determine and manage power for each repetition level independently. This segmentation reduces overall complexity by breaking down the complex multi-level power management into manageable, standardized units.
Solution Approach 2:
The patent applies preliminary action by having the network device pre-configure power calculation parameters or lookup tables for different repetition levels before actual transmission occurs. The UE can then directly use these pre-configured parameters to determine transmit power without complex real-time calculations, reducing operational complexity while maintaining reliability across multiple repetition levels.
3Reliability
If transmit power is increased for better coverage, then path loss compensation is improved, but power consumption in UE increases
Solution Approach 1:
The patent changes the power parameter systematically based on repetition level, using different power calculation approaches for different repetition levels. This allows the system to use higher power only when necessary (at higher repetition levels with greater path loss) while using lower power at lower repetition levels, optimizing the balance between coverage enhancement and power consumption.
Solution Approach 2:
The patent implements feedback mechanisms where the UE indicates its determined repetition level to the network device, and the network device provides feedback on power calculation parameters. This closed-loop feedback allows the system to adjust power consumption based on actual channel conditions and repetition level requirements, avoiding unnecessary power consumption while maintaining coverage enhancement where needed.
Data Source
AI summary
A physical random access channel enhanced transmission method, a network device, and a terminal are disclosed, where implementation of the terminal is used as an example, and the terminal includes: a processor, configured to determine level information of physical random access channel PRACH enhanced transmission; and to determine a first characteristic parameter that is of PRACH enhanced transmission and that is related to the determined level information of PRACH enhanced transmission, where the first characteristic parameter includes transmit power and a preamble format; and a transmitter, configured to perform PRACH enhanced sending according to the first characteristic parameter determined by the processor.