Uplink Power Sharing in LTE-NR Dual Connectivity
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Solution Overview
Problem
In dual-connectivity scenarios between LTE and NR systems below 6 GHz, there is a need for an effective power sharing mechanism between component carriers to ensure proper power allocation and management, as existing methods fail to timely and efficiently schedule uplink transmissions based on varying subcarrier spacings and power headrooms.
Innovation Solution
A communication method where a network device receives and schedules uplink transmissions from a terminal based on information about power headroom, maximum available transmit power, and subcarrier spacing differences between component carriers, adjusting frequency domain resources and uplink power to implement power sharing, and classifies carriers by subcarrier spacing for group-based scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power sharing between component carriers is implemented using existing methods, then power allocation can be performed, but timely and efficient scheduling based on varying subcarrier spacings and power headrooms cannot be achieved
Solution Approach 1:
The patent segments component carriers into different groups based on their subcarrier spacing values. Carriers with the same subcarrier spacing are grouped together, allowing for simplified power sharing calculations within each group while maintaining overall system efficiency. This segmentation resolves the contradiction by reducing scheduling complexity without sacrificing productivity.
Solution Approach 2:
The patent introduces new parameters including power headroom information and subcarrier spacing-based grouping to transform the power sharing mechanism. By changing how power allocation parameters are organized and transmitted (through enhanced power headroom reports), the system achieves timely and efficient scheduling without excessive complexity.
2Measurement precision
If detailed power headroom and power difference information is transmitted for accurate power sharing, then power allocation accuracy improves, but uplink transmission overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential power sharing information needed for accurate power allocation. Specifically, it transmits power headroom information and power difference indicators rather than complete power state data, achieving measurement precision while reducing uplink overhead.
Solution Approach 2:
The patent transmits partial power information (power headroom and power difference) rather than complete power state details. This partial action provides sufficient accuracy for power sharing decisions without the excessive overhead of transmitting all possible power parameters.
3Ease of operation
If power sharing is implemented without considering subcarrier spacing differences, then scheduling is simpler, but power requirements of each cell group cannot be ensured
Solution Approach 1:
The patent applies different power sharing approaches to different component carrier groups based on their local characteristics (subcarrier spacing). Each group is handled according to its specific subcarrier spacing requirements, ensuring reliable power allocation while maintaining operational simplicity through standardized group-based procedures.
Data Source
AI summary
A method includes: receiving, by a network device, first information, second information, and third information from a terminal using a first component carrier, where the first information includes a power headroom of the first component carrier, the second information indicates whether transmit power of the terminal is equal to maximum available transmit power of the terminal, the third information indicates a difference between the maximum available transmit power and transmit power of a second component carrier, and a subcarrier spacing of the first component carrier is greater than a subcarrier spacing of the second component carrier; and scheduling, by the network device, uplink transmission of the terminal based on the first information, the second information, and the third information, where uplink transmit power of the first component carrier does not exceed the difference.