Bluetooth Piconet Receiver Power Gating with Conditional AGC

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Solution Overview

Problem

Existing wireless communication systems, such as Bluetooth, consume excessive power due to continuous operation of receivers during packet reception, particularly during the preamble, control information, and payload data units, despite varying connection states and interference levels.

Innovation Solution

A method and apparatus that selectively powers on and off the receiver based on connection status and signal or interference level, delaying power-up until necessary, using previous AGC values for gain control, and performing AGC only when needed, thereby reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the receiver is powered on continuously to receive packets, then packet reception reliability is improved, but power consumption increases

Engineering Contradiction:

Improvepacket reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The receiver dynamically adjusts its power state based on connection status and signal conditions. When connected with stable signal, the receiver stays powered on for reliable reception. When disconnected or in high interference, the receiver powers down to save energy, creating a dynamic adaptation between reliability and power consumption

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the receiver by delaying power-up timing and selectively enabling AGC based on connection state and signal quality metrics, optimizing the balance between reliable packet reception and power consumption

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the receiver is powered on early to perform AGC on the full preamble, then signal quality is improved, but power consumption increases

Engineering Contradiction:

Improvesignal qualityVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Instead of performing AGC on the full preamble duration, the system applies partial AGC action by delaying receiver power-up and using only a portion of the preamble for gain control, or skips AGC entirely when connected with stable signal, reducing power consumption while maintaining sufficient signal quality

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary assessment of connection status and signal conditions before deciding whether to perform AGC, using previous AGC values and signal stability metrics to determine if full AGC is necessary, thereby avoiding unnecessary power consumption

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If the receiver remains powered on during the entire packet including preamble and header, then packet detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvepacket detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The receiver operation is segmented into distinct phases based on packet structure. The receiver is powered on only during specific segments (PDU portion) after skipping the preamble and header when conditions allow, separating the power consumption periods from the full packet duration while maintaining detection accuracy through selective reception

Inventive Principle:

Principle #1Segmentation

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

Significantly reduces power consumption by optimizing receiver operation based on connection status and interference, maintaining effective packet reception while minimizing unnecessary power usage.

Implementation Method 1

An Automatic Gain Controller (AGC) block in the communication system iteratively measures and applies gains by using samples from the preamble to set the required gain for the received frame

Methodology Applied

Scientific EffectAutomatic Gain Control:

Data Source

PatentUS12445964B2Conditional automatic gain control on single station piconet for bluetooth receiver based on connection state

Publication Date: 2025.10.14 SILICON LABORATORIES INC

AI summary

The present invention relates to a method and apparatus for reducing power consumption in a receiver of a time slotted communication system. An RF front end has power applied after the start of a preamble or after the start of a header, or upon the start of a packet payload based on connection status, signal level, and interference level. Where the signal level is constant, the communication system is in a connected state, and the interference level is low, the system bypasses packet header destination address matching, or optionally, uses only the least significant bits of the header destination address for matching purposes.