Dual-Connectivity Uplink Power Limits for Time-Offset Overlap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dual connectivity methods in wireless communications networks lead to suboptimal performance due to low coverage and data rate issues, particularly when overlapping cell group transmissions are scheduled before a time offset, requiring subsequent power adjustments that can cause inefficiencies.
Innovation Solution
A wireless device determines a power limit for a first uplink transmission based on the detection of a downlink grant or assignment for a second uplink transmission, allowing it to set higher power if no overlap is detected and lower power if overlap is imminent, thereby optimizing power sharing across cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless device schedules uplink transmissions in overlapping cell groups before a time offset, then the transmission timing is flexible and resource utilization is improved, but the power control becomes suboptimal requiring subsequent power adjustments
Solution Approach 1:
The wireless device performs preliminary detection of downlink grants or assignments that would trigger overlapping uplink transmissions before the time offset expires. By detecting potential overlaps in advance (before the beginning of the first uplink transmission), the device can proactively adjust power limits for both cell groups, avoiding the need for subsequent power adjustments and ensuring optimal power control from the start of transmission
2Strength
If the wireless device operates at full power without detecting overlapping transmissions, then the coverage and data rate are maximized, but overlapping transmissions cause interference and power conflicts
Solution Approach 1:
The wireless device implements a feedback mechanism by continuously monitoring for downlink grants or assignments that would trigger overlapping uplink transmissions. When such overlapping transmissions are detected before the time offset, the device provides feedback by adjusting the power limit for the first cell group's uplink transmission, thereby reducing power to avoid interference while maintaining optimal performance when no overlap is detected
3Object-generated harmful factors
If the wireless device performs power adjustments after detecting overlapping transmissions, then the interference is reduced, but the latency increases due to subsequent power adjustments
Solution Approach 1:
The patent applies preliminary action by detecting potential overlapping transmissions and adjusting power limits before the first uplink transmission begins. By using the time offset as a detection window, the device performs all necessary power control decisions in advance, eliminating the need for subsequent power adjustments and avoiding the latency that would result from mid-transmission power changes
Data Source
AI summary
A method performed by a wireless device configured with dual connectivity between a first group of cells and a second group of cells is provided. The method includes determining a limit of a power of transmission of a first uplink transmission in the first group of cells. The limit is determined based on detection, before a time offset in relation to a beginning of a time of transmission of the first uplink transmission, of a downlink grant or assignment that triggers the second uplink transmission in the second group of cells overlapping in time with the first uplink transmission. The method further includes setting the power of transmission for the first uplink transmission based on the limit. Methods performed by a first network node and/or a second network node are also provided.