Dual Connectivity Power Control for LTE and 5G NR
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Solution Overview
Problem
In Non-Standalone (NSA) mode, cellular communication devices using both 4G LTE and 5G NR radio access technologies face challenges in managing combined radio transmit power, as LTE and NR base stations often request power levels that exceed the regulated maximum allowed transmit power (P_CMAX) without coordination, leading to potential power exceeding limits.
Innovation Solution
A user equipment (UE) is configured to receive independent transmit power control commands from LTE and NR base stations, with NR transmissions paused if either power exceeds a threshold (P_threshold = P_CMAX/2), allowing LTE power to increase up to P_CMAX while ensuring the combined power does not exceed P_CMAX, by controlling transmit power independently and pausing NR transmissions when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If independent transmit power control commands are received from LTE and NR base stations, then each carrier can operate at optimal power levels, but the combined power may exceed the regulated maximum P_CMAX
Solution Approach 1:
The patent introduces an intermediary power control mechanism that mediates between independent LTE and NR power commands. When the sum of requested LTE power (P_LTE) and NR power (P_NR) exceeds P_CMAX, the system adjusts one carrier's power (typically NR) to ensure P_LTE + P_NR ≤ P_CMAX, while attempting to maintain both connections operational.
Solution Approach 2:
The patent implements dynamic power adjustment where the power allocation between LTE and NR carriers is not fixed but adapts in real-time based on current power requests and the P_CMAX constraint. The system continuously monitors power levels and dynamically reallocates power when constraints are violated.
2Object-affected harmful factors
If NR transmissions are paused when power threshold is exceeded, then combined power remains within limits, but NR transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by proactively reducing NR transmit power or pausing NR transmissions before the combined power actually exceeds P_CMAX. When P_LTE + P_NR would exceed P_CMAX, the system preemptively adjusts NR power down to P_CMAX - P_LTE, preventing the harmful condition of power overload while maintaining NR connection integrity.
Data Source
AI summary
A cellular communication device is configured to use a non-standalone (NSA) mode for communicating with a cellular communication network using simultaneous 4th-Generation (4G) Long-Term Evolution (LTE) and 5th-Generation (5G) Near Radio (NR) radio access technologies. In NSA mode, the UE may receive separate transmit power control commands for LTE transmissions and NR transmissions, respectively. In order to keep total transmitted power below a maximum allowable transmit power P_CMAX, NR transmissions are paused whenever either LTE or NR transmit power is commanded to be greater than half of P_CMAX. This allows LTE transmissions to continue at the commanded LTE transmit power, while preventing the device from exceeding the maximum allowable transmit power.