Dual Connectivity Power Control Using Semi-Static Direction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining available transmission powers for user equipment (UE) in dual connectivity (DC) configurations, particularly when considering the direction of communications between cells.
Innovation Solution
The described techniques enable a UE to determine a maximum transmission power for an uplink transmission on a first cell based on the direction of communications with a separate cell, which can be either actual or assumed, within the same frequency range and duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE determines maximum transmission power based on actual direction of communications with separate cells in dual connectivity configuration, then the power control accuracy is improved, but the complexity of determining transmission power increases due to needing to check multiple cells and their directions
Solution Approach 1:
The patent segments the determination of maximum transmission power by frequency range. The UE determines maximum power for each frequency range independently based on the directions of communications with cells operating in that specific frequency range, rather than considering all cells globally. This segmentation reduces complexity while maintaining accuracy for each frequency range.
Solution Approach 2:
The patent applies local quality by considering the direction of communications with only those cells that operate in the same frequency range as the uplink transmission. The maximum transmission power determination is localized to relevant cells and frequency ranges, ignoring cells in other frequency ranges, thus reducing unnecessary complexity.
2Reliability
If the UE considers direction of communications with all cells in dual connectivity configuration, then the reliability of power determination is improved, but the time required for power control increases
Solution Approach 1:
The patent improves efficiency by applying local quality - considering only the directions of communications with cells operating in the same frequency range as the uplink transmission. This localized approach maintains reliability for the relevant frequency range while significantly reducing the time required compared to evaluating all cells across all frequency ranges.
Solution Approach 2:
The patent segments the power determination process by frequency range, evaluating only the subset of cells relevant to each frequency range. This segmentation reduces the overall computation time while maintaining reliability for each segmented frequency range independently.
3Device complexity
If the UE uses assumed direction of communications for power control, then the device complexity is reduced, but the measurement precision of power control deteriorates
Solution Approach 1:
The patent applies local quality by using the actual direction of communications with cells in the same frequency range, providing locally accurate power control decisions. This approach maintains measurement precision for each frequency range without requiring complex assumed direction logic across all cells.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a maximum transmission power for an uplink transmission on a first cell of a first cell group (CG) based on a direction of communications (e.g., uplink, downlink, or flexible) with a separate cell of a second CG during a same duration of the uplink transmission and within a same first frequency range, where the direction of communications is either an actual direction or an assumed direction. The UE may receive an uplink grant scheduling the uplink transmission during a symbol and within the first frequency range, determine the maximum transmission power for the UE based on the direction of communications for the separate cell during the symbol and within the first frequency range, and subsequently transmit the uplink transmission in accordance with the maximum transmission power.