Bluetooth Chip Early RF Receiver Shutdown for Power Savings

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Solution Overview

Problem

Current Bluetooth communication systems waste power by continuously receiving retransmitted packets, as they do not efficiently identify and stop processing these packets, leading to unnecessary power consumption.

Innovation Solution

A Bluetooth communication system and chip that identify whether a packet is retransmitted by analyzing its header, specifically using the SEQN bit and CRC check, to determine if the RF receiver and modem can be turned off early in the receive slot, thereby reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the RF receiver and modem continuously receive packets in every receive slot, then data reception reliability is improved, but power consumption increases due to processing retransmitted packets

Engineering Contradiction:

Improvedata reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by checking the packet header (specifically the SEQN bit) before fully processing the packet payload. The RF receiver is turned off early in the receive slot after detecting a retransmitted packet through header analysis, preventing unnecessary processing of the entire packet while maintaining reliable data reception through selective continuation of reception based on header validation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using the SEQN bit in the packet header to identify retransmitted packets. The system continuously monitors incoming packet headers, compares sequence numbers, and provides feedback control to turn off the RF receiver early when retransmission is detected, creating a closed-loop power management system that adjusts reception behavior based on real-time packet analysis

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If the RF receiver is turned off early in the receive slot, then power consumption is reduced, but data reception may be interrupted

Engineering Contradiction:

Improvepower consumptionVSAvoiddata reception reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent performs preliminary validation of the packet header (including SEQN bit and other header fields) before making the decision to turn off the RF receiver. This preliminary action ensures that only properly formatted and non-retransmitted packets trigger early termination, while valid packets continue to be fully received, thus maintaining data reception reliability while enabling power savings

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from packet header analysis to dynamically control RF receiver operation. The header validation results provide feedback that determines whether to continue or terminate reception, creating an adaptive system that maintains reliability for valid packets while saving power for retransmitted or erroneous packets

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11570605B2Bluetooth communication system, electronic device and Bluetooth chip having low power consumption

Publication Date: 2023.01.31 AIROHA TECHNOLOGY CORPORATION

AI summary

There is provided an electronic device having Bluetooth communication function. The electronic device confirms whether a current packet received in a receive slot is a retransmitted packet according to a SEQN bit in the packet header so as to determine whether to continuously turn on an RF receiver in the receive slot or early turn off the RF receiver to save power.