Bluetooth Receiver AGC and Partial Address Detection for Lower Power
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Solution Overview
Problem
Existing wireless communication systems, such as Bluetooth, consume excessive power due to continuous operation during packet reception, particularly in time-slotted protocols like Bluetooth Low Energy (BLE) and Bluetooth Long Range (BLR), despite the ability to operate intermittently.
Innovation Solution
A method and apparatus for reducing power consumption by selectively powering up the receiver based on connection status and signal or interference levels, utilizing previous AGC values, partial or no AGC processes, and delayed power-up during specific packet fields, such as the preamble and access address, to minimize unnecessary component activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver is powered on continuously to receive packets, then packet reception reliability is improved, but power consumption increases
Solution Approach 1:
The receiver operates in periodic cycles, alternating between active reception mode and low-power sleep mode. The system wakes up at predetermined time slots to check for packets, processes received data, and then returns to sleep mode. This periodic operation pattern reduces average power consumption while ensuring packets are captured during active periods.
Solution Approach 2:
The system performs preliminary actions by predicting packet arrival times based on communication protocols and scheduled transmission patterns. The receiver is activated slightly before expected packet arrivals to ensure capture, then immediately enters sleep mode after processing, avoiding continuous operation.
2Use of energy by moving object
If the receiver is powered off during idle periods, then power consumption is reduced, but packet detection capability deteriorates
Solution Approach 1:
The receiver's operational state is dynamically adjusted based on real-time conditions. The system transitions between sleep and active states according to packet arrival patterns, signal strength measurements, and communication protocol requirements. This dynamic state management ensures the receiver is active only when packets are likely to arrive.
Solution Approach 2:
The system uses feedback mechanisms to monitor communication channel activity, signal presence, and packet transmission patterns. Based on this feedback, the receiver intelligently determines when to wake from sleep mode and when to remain powered off, optimizing the balance between power savings and packet detection capability.
3Measurement precision
If the AGC process is performed using the full preamble, then gain control accuracy is improved, but power consumption increases due to extended receiver activation
Solution Approach 1:
Instead of performing the complete AGC process using the entire preamble, the system applies partial AGC action by using only a portion of the preamble for gain calibration. The receiver activates just long enough to complete the essential AGC measurements, then enters sleep mode, accepting slightly reduced precision in exchange for significant power savings.
Solution Approach 2:
The system performs preliminary gain control measurements using previous AGC values stored from prior receptions. This preliminary action allows the receiver to skip or shorten the current AGC process, reducing activation time and power consumption while maintaining adequate gain control accuracy through incremental adjustments.
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 in Bluetooth systems, ensuring efficient packet reception while maintaining connectivity and reducing power usage during idle periods.
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
Implementation Method 2
It is desired to provide an apparatus and process for selectively powering on and off the receiver to reduce power consumption for packets by enabling and disabling the receiver in manners specific to the station of connection and interference or noise level
Data Source
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.