Cell Selection for Dual-Connectivity Power Management
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Solution Overview
Problem
In dual-connectivity wireless communication systems, the maximum transmission power available for secondary cells using different radio access technologies is often significantly reduced, leading to degraded reliability and throughput, as primary cells prioritize uplink transmissions, necessitating a method to ensure sufficient power reserves for secondary cells.
Innovation Solution
A wireless device selects primary cells with upper power limits below a threshold, based on received indications and selection criteria, to ensure a minimum power reserve for secondary cells, thereby maintaining reliable uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If primary cells prioritize uplink transmissions with higher power limits, then uplink transmission performance is improved, but power available for secondary cells is reduced
Solution Approach 1:
The wireless device performs preliminary evaluation of candidate primary cells based on their upper power limit indications before selecting a primary cell. By proactively assessing power limits and estimating required power for secondary cell transmissions, the device ensures sufficient power reserves are maintained for secondary cells while still allowing primary cells to prioritize uplink transmissions within acceptable limits.
2Productivity
If primary cells allocate more power to uplink transmissions, then throughput is improved, but power reserve for secondary cells deteriorates
Solution Approach 1:
The wireless device estimates the power required for secondary cell uplink transmissions and uses this feedback to evaluate candidate primary cells. The device selects a primary cell whose upper power limit allows sufficient power reserve for secondary cell operations. This feedback mechanism ensures that primary cell power allocation decisions consider the power requirements of secondary cells, maintaining both throughput and power reserve.
3Adaptability or versatility
If multiple primary cells are available with different power limits, then cell selection flexibility is improved, but complexity of selecting appropriate cell increases
Solution Approach 1:
The wireless device uses the upper power limit parameter as a key criterion for evaluating and selecting candidate primary cells. By changing the selection parameter from merely signal strength to include upper power limit considerations, the device maintains flexibility in cell selection while systematically managing the complexity through a clear evaluation framework that prioritizes cells with appropriate power limits for dual-connectivity operation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless device that supports concurrent communications using multiple radio access technologies may receive multiple indications of primary upper power limits for transmitting over multiple primary cells. The wireless device may select a primary cell having a primary upper power limit that is below a threshold. A secondary upper power limit for performing uplink transmission over a secondary cell may be based on the primary upper power limit for the selected primary cell. The wireless device may perform uplink transmissions over the primary cell and the secondary cell in accordance with the primary and secondary upper power limits.