RF Matching Network Tuning via Sub-band Power Offsets
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Solution Overview
Problem
In cellular communication systems, achieving ideal RF tuning is challenging due to real-time constraints and lack of timely information about frequency, channel, or sub-band data, leading to inadequate synchronization with transmit, receive, and frequency change events, which results in poor handover performance and reduced RF power levels, especially when dealing with neighbor cells.
Innovation Solution
A method for a communication device to adjust its tuning state using power offsets associated with specific sub-bands, based on empirical data, to compensate for frequency deviations and improve RF power levels, involving a matching network with variable reactance elements and a controller that selects appropriate power offsets from a look-up table to generate offset values for transmit and receive powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time tuning control is implemented in the handset, then synchronization with RF events can be improved, but software programming constraints and timing accuracy deteriorate
Solution Approach 1:
The patent segments the tuning control into multiple independent components: a tuning state machine that generates timing events, a separate tuning controller that processes these events, and lookup tables that store pre-calculated tuning parameters. This segmentation allows each component to operate independently with well-defined interfaces, reducing software programming constraints while maintaining synchronization reliability.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing tuning parameters in lookup tables before runtime. The tuning state machine pre-generates timing events based on expected RF scenarios. This allows the runtime system to simply retrieve and apply pre-computed values, eliminating complex real-time calculations and improving timing accuracy without increasing software complexity.
2Measurement precision
If frequency, channel, or sub-band information is made available in real-time, then tuning accuracy can be improved, but information availability and processing overhead worsen
Solution Approach 1:
The patent applies local quality by providing different levels of frequency information to different software components based on their specific needs. The tuning state machine receives only the essential radio band identifier, while the tuning controller receives additional sub-band information when needed. Lookup tables are organized with hierarchical indexing (band → sub-band → frequency) allowing efficient retrieval without transmitting all possible information. This selective information distribution maintains tuning accuracy while reducing processing overhead.
3Reliability
If the tuner is adequately synchronized with all RF events, then communication quality can be improved, but device complexity and processing requirements worsen
Solution Approach 1:
The patent implements self-service by designing a tuning state machine that autonomously monitors RF event timing and automatically generates appropriate timing events without external intervention. The state machine self-adjusts its behavior based on the current RF state (transmit, receive, frequency change) and automatically retrieves appropriate tuning parameters from lookup tables. This self-service capability ensures adequate synchronization with all RF events while keeping the overall system complexity manageable by eliminating the need for complex external coordination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more accurate RF tuning across various frequencies and sub-bands, enhancing handover performance and maintaining optimal RF power levels, even when operating with neighbor cells, thereby improving communication quality and reducing call drops and data rate issues.
Implementation Method 1
adjusting a tuning state of a matching network of the communication device
Data Source
AI summary
A system that incorporates teachings of the present disclosure may include, for example, adjusting a tuning state of a matching network of the communication device, selecting a power offset from among a group of power offsets where the selected power offset is associated with a sub-band of operation of the communication device, and adjusting a value associated with a measured receive power or a transmit power of the communication device based on the selected power offset to generate an offset power value. Additional embodiments are disclosed.