Power Headroom Report Transmission in Dual Connectivity
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) connected to multiple heterogeneous base stations faces challenges in efficiently reporting power headroom information, which is crucial for resource allocation and minimizing battery consumption, especially in dual connectivity scenarios between macro and small cells.
Innovation Solution
A method for transmitting power headroom reports (PHR) by UE, triggered based on path loss changes and periodic timers, involving simultaneous reporting to both macro and small base stations, allowing for efficient uplink resource allocation by providing power headroom information for each frequency band, even when the UE is connected to both base stations simultaneously or transmitting to only one at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the user equipment transmits power headroom reports to multiple base stations simultaneously, then the resource allocation efficiency is improved, but the battery consumption increases
Solution Approach 1:
The patent implements dynamic reporting strategies where the UE adapts its PHR transmission behavior based on current dual connectivity state and uplink scheduling conditions. The system dynamically selects between simultaneous reporting to multiple base stations or selective reporting based on real-time operational context, optimizing the balance between resource allocation efficiency and battery consumption.
Solution Approach 2:
The patent applies different reporting behaviors to different base stations and frequency bands based on local conditions. When uplink is configured with both base stations, the UE transmits separate PHR reports to each. When uplink is configured with only one base station, the UE selectively reports only to that base station, making the reporting quality and frequency locally optimized for each connection.
2Measurement precision
If the user equipment transmits separate power headroom reports to each base station, then the accuracy of power headroom information is improved, but the signaling overhead increases
Solution Approach 1:
The patent segments the power headroom reporting process into separate reports for different base stations and frequency bands. Each PHR report contains power headroom information specific to its target base station and frequency band, allowing for precise and accurate reporting without requiring a single comprehensive report that would increase overall signaling overhead.
3Use of energy by moving object
If the user equipment stores and transmits power headroom reports selectively, then the battery consumption is reduced, but the timeliness of power headroom reporting may be compromised
Solution Approach 1:
The patent implements preliminary storage of power headroom reports in the UE before transmission. By pre-calculating and storing PHR information, the system prepares data in advance for selective transmission, reducing the need for frequent real-time calculations and transmissions, thereby conserving battery energy while maintaining reporting capability when needed.
Data Source
AI summary
Disclosed are a method and an apparatus for transmitting a power headroom report (PHR) by a terminal which is set to be dually connected to at least two heterogeneous base stations through uplink wireless connection. A method for transmitting a power headroom report (PHR) by a user equipment performing wireless communication based on dual connectivity. The method may include triggering the PHR based on at least one of a path loss change and a periodic timer; and transmitting at least one PHR to at least one base station according to the dual connectivity.