Uplink Power Control Across MCG and SCG in 5G Multi-Connectivity
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing uplink transmission power in dual connectivity or multi-connectivity scenarios involving multiple cell groups with different radio access technologies, particularly in 5G communication systems, where activation and deactivation timing of cell groups complicate power control.
Innovation Solution
A method and device for uplink power control in wireless communication systems that involve configuring and managing transmission power for multiple cell groups based on received cell group configuration information, including a master cell group and secondary cell groups, to optimize power levels according to the connectivity type and activation status of each group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cell groups are configured for multi-connectivity, then communication reliability and data rate are improved, but uplink power management complexity increases
Solution Approach 1:
The patent segments the cell groups into master cell group (MCG) and secondary cell group (SCG) for independent power control. Each cell group has separate maximum transmission power parameters (PMax,MCG and PMax,SCG), allowing independent power management while maintaining multi-connectivity benefits. This segmentation resolves the contradiction by organizing the complex multi-connectivity power control into manageable independent units.
Solution Approach 2:
The patent implements dynamic power control where the UE determines transmission power for each cell group based on real-time conditions including activation status, power headroom, and network commands. The power control parameters can be dynamically adjusted through RRC reconfiguration and MAC CE commands, allowing the system to adapt to changing conditions while maintaining reliability across multiple cell groups.
2Reliability
If transmission power is increased for multiple cell groups, then uplink signal quality is improved, but total power consumption increases
Solution Approach 1:
The patent changes power parameters dynamically based on cell group activation status and network conditions. When SCG is deactivated, power transmission on SCG uplink is stopped or reduced. The maximum transmission power parameters (PMax,MCG and PMax,SCG) are configurable and can be adjusted to optimize the balance between signal quality and power consumption for each cell group independently.
Solution Approach 2:
The patent applies partial power transmission by allowing the UE to transmit on MCG with full power while reducing or stopping SCG transmission when SCG is deactivated. This partial action approach ensures that critical communications on MCG maintain high quality while reducing overall power consumption by not transmitting on all cell groups simultaneously.
3Adaptability or versatility
If different radio access technologies are used in multiple cell groups, then service diversity and adaptability are improved, but power control difficulty increases
Solution Approach 1:
The patent implements a universal power control framework that works across different radio access technologies (LTE and NR). The same power control mechanisms, parameters (PMax,MCG and PMax,SCG), and control procedures apply regardless of which RAT is used in MCG or SCG. This universality allows the system to support diverse services with different RATs while maintaining manageable power control complexity through a unified approach.
Data Source
AI summary
The present disclosure relates to a 5G or a pre-5G communication system to be provided to support a data transmission rate higher than that of a 4G communication system such as LTE. A method for performing an uplink power control for multi-connectivity in a wireless communication system may comprise the steps of: receiving, from a base station, cell group configuration information related to a master cell group (MCG) and one or more secondary cell groups (SCGs), among multiple cell groups configured for a terminal, wherein the cell group configuration information indicates each of maximum transmission power of the MCG and maximum transmission power of each of the SCGs; and transmitting, to the base station through the MCG and the SCGs, uplink signals having transmission power of the MCG and transmission power of each of the SCGs, determined according to the maximum transmission power of the MCG and the maximum transmission power of each of the SCGs and a multi-connectivity type of the multiple cell groups.