UE Max Transmission Power Coordination in Dual Connectivity
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Solution Overview
Problem
In wireless communication systems with dual connectivity, base stations struggle to accurately manage and coordinate maximum transmission power across multiple cells, leading to potential over-allocation of transmission power and subsequent scaling down of UL transmission power, which affects transmission efficiency and battery consumption.
Innovation Solution
A method and apparatus for configuring and signaling dedicated maximum transmission power (PEMAX) to User Equipment (UE) by each base station, ensuring that the sum of maximum transmission powers from both macro and small base stations does not exceed the UE's maximum output power, thereby preventing excessive power allocation and maintaining efficient resource distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations independently allocate maximum transmission power to UE in dual connectivity, then each base station can optimize its own scheduling, but the sum of allocated powers may exceed UE's maximum output power capability
Solution Approach 1:
The patent merges the power allocation control of multiple base stations by introducing a master base station that coordinates with secondary base stations. The master base station receives power headroom information from the UE and calculates the maximum transmission power considering all connected base stations, ensuring the sum does not exceed UE's maximum output power. This coordinated approach resolves the contradiction by combining previously independent allocation decisions into a unified power management system.
2Reliability
If base stations exchange scheduling information to coordinate power allocation, then power allocation accuracy improves, but system complexity and signaling overhead increase
Solution Approach 1:
The patent introduces the master base station as an intermediary that mediates between the UE and secondary base stations. Instead of requiring all base stations to exchange scheduling information directly, the master base station receives power headroom information from the UE, performs centralized power calculation, and coordinates with secondary base stations only when needed. This intermediary approach maintains power allocation accuracy while reducing overall system complexity compared to full inter-base-station communication.
3Productivity
If UE transmits at maximum allocated power, then transmission efficiency is maximized, but battery consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports power headroom information to the master base station, which then adjusts the maximum transmission power allocation accordingly. The UE transmits at the allocated maximum power when needed for high transmission efficiency, but the system can reduce power allocation when full power is not required, as determined by the power headroom feedback. This feedback-based dynamic power adjustment resolves the contradiction by allowing the system to optimize between transmission efficiency and battery consumption based on actual network conditions.
Data Source
AI summary
The present invention provides a method and an apparatus for establishing maximum transmission power. The present invention comprises: receiving an RRC message including a user equipment-specific maximum transmission power value established by a first base station or a second base station; reestablishing maximum output power based on the user equipment specific maximum transmission power value; and simultaneously transmitting an uplink to the first base station or the second base station within the reestablished maximum output power. The user equipment-specific maximum transmission power value is established for each of the first base station and the second base station, and the sum of the user equipment-specific maximum transmission power value for the first base station and the user equipment-specific maximum transmission power value for the second base station is less than or equal to a maximum output power value for the user equipment.