Bluetooth Adaptive Frequency Hopping Channel Map Generation
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Solution Overview
Problem
Existing Bluetooth technologies face inefficiencies in channel quality assessment due to hardware limitations in smaller devices, leading to unpredictable channel selection and increased power consumption, as they either rely on simple adaptive frequency hopping methods or consume significant power by continuously assessing channel quality.
Innovation Solution
A system and method where a primary wireless accessory receives information from a host device to generate a communication channel map, avoiding interference channels, thereby reducing power consumption and improving channel selection by leveraging the host device's superior channel assessment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a BT radio continuously listens on unused channels for channel quality assessment, then channel interference assessment accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The host device performs channel quality assessment in advance and provides the results to the accessory device. This preliminary action allows the accessory to avoid continuous channel listening, significantly reducing its power consumption while maintaining accurate channel interference assessment capability.
2Device complexity
If devices with hardware limitations use simple adaptive frequency hopping without idle channel assessment, then device complexity is reduced, but channel selection performance becomes unpredictable
Solution Approach 1:
The host device acts as an intermediary that performs the complex channel quality assessment function. The accessory device, which has hardware limitations, receives the assessment results from the host and uses them for reliable channel selection, achieving good performance without complex hardware.
3Productivity
If channels are restored to the channel map without further assessment after being inactive for X seconds, then channel availability is improved, but packet loss risk increases due to potential interference
Solution Approach 1:
The host device performs preliminary channel quality assessment before restoring channels to the active channel map. This ensures that only channels with acceptable quality are restored, maintaining high channel availability while preventing packet loss from interference.
4Device complexity
If only packet error rate in active channels is assessed, then measurement complexity is reduced, but channel quality assessment completeness deteriorates
Solution Approach 1:
The host device performs universal channel quality assessment that covers both active and unused channels. This multi-functional assessment provides complete channel quality information that can be used for all channel selection decisions, improving assessment completeness without adding complexity to individual devices.
Data Source
AI summary
A system and method is provided for improving signal quality in communications among fully wireless systems including a host device in wireless communication with a primary accessory which further wirelessly communicates with a secondary accessory. The host device generates information for use by the primary accessory in determining which channels have interference and should be avoided. The information may include an adaptive frequency hopping (AFH) channel map for communications between the host and the primary device, from which the primary device can infer which frequency bands have interference and generate a second AFH map for communications between the primary accessory and the secondary accessory accordingly. In other examples the information includes the second AFH map generated by the host, for example, based on an out-of-band scan. In further examples, the information includes an indication of channels used by recognized nearby access points.