Uplink Power Control for Asynchronous Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently controlling uplink power, particularly in scenarios where the primary cell (MeNB) and secondary cell (SeNB) are asynchronous or synchronous, especially when considering overlapped subframes and used transmission power.
Innovation Solution
A method and apparatus for determining maximum transmission power by receiving a signal with information on power control mode, determining whether primary and secondary cells are asynchronous or synchronous, and adjusting transmission power accordingly to optimize power headroom and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink power control is implemented in dual connectivity mode with MeNB and SeNB, then system capacity and service availability are improved, but power control complexity and difficulty of determining maximum transmission power increase due to asynchronous or synchronous operations
Solution Approach 1:
The patent segments the power control process into distinct phases: determining whether MeNB and SeNB are synchronous or asynchronous, calculating maximum transmission power based on the synchronization state, and separately handling power allocation for each cell. This segmentation simplifies the overall power control complexity by breaking down the complex dual connectivity power control into manageable steps.
Solution Approach 2:
The patent performs preliminary determination of the synchronization state (synchronous or asynchronous) between MeNB and SeNB before calculating maximum transmission power. This preliminary action allows the system to pre-establish the appropriate power control mode, avoiding complex real-time decisions and simplifying subsequent power allocation operations.
2Measurement precision
If maximum transmission power is determined considering overlapped subframes in asynchronous dual connectivity, then power headroom accuracy is improved, but calculation complexity and time consumption increase
Solution Approach 1:
The patent identifies overlapped subframes in advance and pre-calculates the maximum transmission power considering these overlaps. By performing this calculation beforehand, the system achieves accurate power headroom measurement without incurring high computational costs during real-time transmission, thus reducing time consumption while maintaining precision.
Solution Approach 2:
The patent applies different power control strategies to different subframe types: for non-overlapped subframes, simpler power control is used, while for overlapped subframes, the more complex but accurate power control considering both MeNB and SeNB constraints is applied. This localized approach ensures high accuracy where needed while minimizing overall calculation complexity and time.
3Adaptability or versatility
If power control adapts to both synchronous and asynchronous modes, then system adaptability is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent implements a dynamic power control mechanism that automatically adapts between synchronous and asynchronous modes based on the detected synchronization state of MeNB and SeNB. The system dynamically switches power control algorithms according to the operational mode, providing high adaptability while maintaining operational simplicity through automated mode detection and selection.
Solution Approach 2:
The patent creates a universal power control framework that handles both synchronous and asynchronous dual connectivity operations through a unified approach. The framework includes a synchronization state detection module and a mode-selective power control algorithm that works for both operational modes, reducing the need for separate operational procedures and simplifying overall system operation.
4Measurement precision
If uplink power control considers used transmission power at previous subframe, then power control precision is improved, but processing complexity and computational load increase
Solution Approach 1:
The patent implements a feedback mechanism where the used transmission power at the previous subframe is fed back into the current subframe's power control calculation. This feedback loop enables precise power control by considering historical power usage, while the feedback structure itself provides a systematic and manageable approach to handling the increased processing requirements.
Data Source
AI summary
Descriptions on the method and the apparatus for controlling uplink transmission power are provided. The method for controlling uplink transmission power comprises receiving a signal on a downlink channel, wherein the signal includes information on transmission power which indicates a power control mode, determining whether primary cell (PCell) and secondary cell (SCell) are asynchronous or synchronous, determining maximum transmission power for the SCell, using the information on transmission power, based on whether the PCell and the SCell are asynchronous or synchronous, and transmitting signal to the SCell based on the maximum transmission power for the SCell.