UL MIMO Power Control for Sub-1 GHz Uplink Transmission
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Solution Overview
Problem
In 5G new radio access technology, the maximum transmission power of terminal devices is limited by the defined maximum UE powers of different power classes, leading to poor uplink transmission performance in frequency bands lower than 1 GHz when operating in UL MIMO mode.
Innovation Solution
The terminal device reports its power control capability to the network, allowing it to adjust transmit power based on this capability, potentially increasing the power beyond the maximum UE power limits, using methods such as adjusting MPR and A-MPR values, and incorporating power class adjustments to enhance uplink transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses the maximum UE power corresponding to power class 3 (23 dBm) in frequency bands lower than 1 GHz for UL MIMO transmission, then the terminal device complies with the defined power class limits, but the uplink transmission performance is poor due to insufficient transmit power
Solution Approach 1:
The patent changes the power control parameters by allowing the terminal to determine MPR and A-MPR values based on the actual transmission scenario rather than being strictly bound by power class definitions. This enables the terminal to adjust the maximum transmission power dynamically, achieving higher transmit power in UL MIMO mode while maintaining compliance through proper parameter selection.
Solution Approach 2:
The patent introduces dynamic power adjustment capability where the terminal can flexibly determine transmit power based on real-time transmission conditions, power control capability indicators, and network configuration. This dynamic approach allows the system to adapt power levels to actual needs rather than being constrained by static power class definitions.
2Power
If the terminal device is strictly limited by the maximum UE power corresponding to the supported power class, then the terminal device ensures compliance with power class definitions, but the transmit power is insufficient for achieving good uplink transmission performance in UL MIMO mode
Solution Approach 1:
The patent enables dynamic power control by allowing the terminal to determine MPR and A-MPR values flexibly based on transmission scenario, power control capability indicators, and network configuration. This creates a dynamic power adjustment mechanism that adapts to different UL MIMO transmission conditions while maintaining compliance through proper parameter selection.
Solution Approach 2:
The patent segments the power control process into distinct components: power class support indication, power control capability indication, and dynamic parameter determination. This segmentation allows the system to maintain compliance with power class definitions while enabling flexible power adjustment through separate control mechanisms.
3Reliability
If the terminal device increases transmit power beyond the maximum UE power limit, then the uplink transmission performance improves, but the terminal device violates the defined maximum UE power constraints for the supported power class
Solution Approach 1:
The patent introduces power control capability indicators and configurable parameters (MPR, A-MPR) as intermediaries between the terminal and the network. These intermediaries enable the terminal to request and receive authorization for enhanced power transmission, allowing performance improvement while maintaining system control and compliance through network-configured parameters.
Solution Approach 2:
The patent creates a universal power control mechanism that can operate within defined power class limits while also supporting enhanced power transmission when configured by the network. This multi-functional approach allows the same system to comply with standards and achieve performance enhancement without violating constraints.
4Adaptability or versatility
If the terminal device uses fixed power class definitions for power determination, then the terminal device ensures consistent power class compliance, but the transmit power cannot be flexibly adjusted to optimize uplink transmission performance
Solution Approach 1:
The patent segments power control into distinct functional components: power class indication, capability indication, and dynamic parameter determination. This segmentation manages complexity by separating compliance functions from optimization functions, allowing each to be handled independently through specific mechanisms.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal reports power control capability indicators to the network, and the network configures appropriate parameters based on this feedback. This feedback loop enables flexible power adjustment while managing system complexity through standardized reporting and configuration procedures.
Data Source
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AI summary
This application provides a communication method and apparatus, to flexibly adjust a transmit power for uplink transmission, and adjust performance of the uplink transmission. The method includes: A terminal device sends first information, where the first information indicates a power control capability supported when the terminal device sends first uplink transmission in an uplink multiple antenna transmission UL MIMO mode in a first frequency band; and when the terminal device supports a first power class and a frequency corresponding to the first frequency band is lower than 1 GHz, the terminal device may determine a transmit power for the first uplink transmission based on the power control capability, so that the transmit power for the first uplink transmission is not limited by a maximum UE power corresponding to the first power class.