Terminal Power Control in LTE-NR Dual Connectivity
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Solution Overview
Problem
In dual connectivity communications systems, where a terminal device communicates with both an LTE eNB and an NR gNB, the asynchronous system times and different numerologies can lead to overlapping transmission time periods, causing the transmit power to exceed the maximum allowed, resulting in communication failures.
Innovation Solution
A power determining method where a terminal device calculates first NR power and LTE power based on additional maximum power reduction (AMPR) values, derived from respective resource allocation and scheduling information. If the sum of these powers exceeds the maximum dual connectivity transmit power, the terminal device adjusts the transmission by sending LTE information at the calculated power and either sending or skipping NR information, ensuring the total power does not exceed the limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device simultaneously transmits information to both eNB and gNB in one band, then the data transmission capability is improved, but the transmit power exceeds maximum transmit power resulting in communication failure
Solution Approach 1:
The patent changes the power allocation parameters by introducing AMPR (Additional Maximum Power Reduction) values for both LTE and NR transmissions. The terminal device calculates first AMPR based on NR resource allocation and scheduling information, and second AMPR based on LTE resource allocation and scheduling information, dynamically adjusting power distribution to prevent total power from exceeding maximum limits while maintaining dual connectivity transmission capability
Solution Approach 2:
The patent implements dynamic power adjustment by continuously monitoring resource allocation information and scheduling information from both LTE and NR networks. The terminal device dynamically recalculates AMPR values and adjusts power allocation in real-time based on changing transmission conditions, ensuring power limits are never exceeded while maximizing data transmission capability
2Measurement precision
If the terminal device calculates power using real-time resource allocation information for both LTE and NR, then power allocation accuracy is improved, but system complexity increases due to needing to obtain and process scheduling information from both networks
Solution Approach 1:
The patent segments the power calculation process into distinct LTE and NR components. The terminal device separately obtains resource allocation information from LTE network and scheduling information from NR network, calculates first AMPR for NR based on NR-specific parameters, and calculates second AMPR for LTE based on LTE-specific parameters. This segmentation allows independent optimization of each network's power contribution while maintaining overall power control
Solution Approach 2:
The patent introduces AMPR as an intermediary parameter that mediates between the resource allocation information and final power calculation. Instead of directly combining complex scheduling information from both networks into a single power value, the system uses AMPR as an intermediate step to translate resource allocation requirements into power allocation decisions, simplifying the overall calculation process
Data Source
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AI summary
This application provides a power determining method and an apparatus. The method includes: determining, by a terminal device, first NR power based on first AMPR, where the first AMPR is calculated based on first resource allocation information and NR scheduling information, and the terminal device accesses a first access device by using an LTE access technology, and accesses a second access device by using an NR access technology; determining, by the terminal device, LTE power based on second AMPR, where the second AMPR is calculated based on LTE scheduling information and second resource allocation information; and when a sum of the first NR power and the LTE power is greater than maximum transmit power of the terminal device, sending, by the terminal device, LTE information to the first access device at the LTE power on time domain resources that completely or partially overlap each other, and sending NR information to the second access device at second NR power or skipping sending NR information, where the second NR power is less than the first NR power. In the foregoing solution, a case in which transmit power exceeds the maximum dual connectivity transmit power when the terminal device sends signals to the two access devices can be avoided.