UL MIMO Power Capability Reporting for Sub-1 GHz Uplink
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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 supported power classes, using larger power ranges and configurations to enhance uplink transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses the maximum UE power defined for a specific power class in frequency bands lower than 1 GHz, then the terminal device complies with the power class requirements, but the uplink transmission performance deteriorates due to limited transmit power
Solution Approach 1:
The patent applies dynamics by making the transmit power adjustable rather than fixed. The terminal device dynamically determines the transmit power based on multiple factors including power control capability, supported power classes, and frequency band, allowing the system to adapt power levels to optimize uplink transmission performance while maintaining compliance with power class requirements
Solution Approach 2:
The patent changes the parameter of transmit power by enabling the terminal device to select from different power levels. The terminal device reports power control capability information to the network, and based on this information and the supported power classes, the terminal device determines an appropriate transmit power that may differ from the fixed maximum UE power definition, thereby improving uplink transmission performance
2Reliability
If the terminal device reports power control capability to the network, then the transmit power can be flexibly adjusted to improve uplink performance, but the device complexity increases due to additional capability reporting and power determination procedures
Solution Approach 1:
The patent applies preliminary action by having the terminal device report its power control capability to the network device before actual uplink transmission occurs. This capability reporting is performed in advance, allowing the network to configure appropriate power parameters and the terminal to determine suitable transmit power levels before data transmission begins, thereby avoiding complexity during the actual transmission process
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device reports power control capability information to the network device. Based on this feedback, the network can adjust power configuration parameters, and the terminal device determines transmit power accordingly. This feedback loop enables flexible power adjustment while distributing the complexity management between terminal and network
Data Source
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.