Coordinated Multipoint Power Control via Virtual Cell Offsets
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE technology, face challenges in optimizing power control for user equipment (UE) transmissions, leading to inefficiencies in signal power management and increased interference between cells and UEs.
Innovation Solution
An apparatus determines the transmission power of signals from UEs and generates power control commands, incorporating predefined power offsets to adjust signal powers, allowing for coordinated multipoint transmission and reduced interference by dynamically managing power levels based on channel state information and virtual cell identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform power control commands are transmitted to all UEs, then power management is simplified, but interference between cells and UEs increases and signal power optimization is reduced
Solution Approach 1:
The patent applies local quality by assigning different power offsets to different UEs based on their specific characteristics such as virtual cell identifiers and channel state information. Instead of uniform power control, each UE receives customized power adjustment commands that account for local interference conditions and signal quality requirements, thereby reducing overall interference while maintaining manageable complexity through automated differentiation.
2Object-generated harmful factors
If dynamic power adjustment per UE is implemented, then signal power optimization and interference reduction improve, but system complexity increases
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting power offset values for different UEs based on varying channel conditions, virtual cell identifiers, and transmission formats. The base station modifies power control parameters individually for each UE, enabling optimized signal power and reduced interference without requiring complete system redesign, thus managing complexity through targeted parameter adjustment rather than structural complexity.
3Ease of operation
If power control commands are format-independent, then processing is simpler, but adaptability to different transmission formats is reduced
Solution Approach 1:
The patent applies dynamics by making power control commands format-dependent, where the power offset applied by a UE is determined by both the power control command received and the specific transmission format being used. This dynamic approach allows the system to adapt power control to different transmission formats (such as different PUCCH formats) while maintaining systematic processing through standardized command structures that incorporate format-specific parameters.
Data Source
AI summary
An apparatus determines a transmission power of a signal transmitted by a user equipment (UE) in a cell that is identified by a virtual cell identifier. The apparatus generates a power control command based on the determined signal power, and transmits the power control command to a plurality of UEs. Subsequent to transmission of the power control command, the apparatus receives a plurality of transmissions from the plurality of UEs. Some of the transmissions have different transmission powers. The different transmission powers of the signals transmitted by the UEs are due to the power control command and a predefined power offset associated with each respective UE.