Bluetooth Controller Dual-Flag Acknowledgment Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Bluetooth communication systems experience a high probability of packet retransmission, especially when devices are far apart or in interfering environments, leading to inefficiencies in audio packet transmission between primary and secondary devices.
Innovation Solution
A controller for wireless stereo Bluetooth devices employs flags (P-ACK and S-ACK) to confirm successful packet reception and decoding by both devices, allowing for reduced retransmissions by asserting these flags and transmitting acknowledgments accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Bluetooth communication is used, then devices can communicate wirelessly, but the number of packet retransmissions increases significantly
Solution Approach 1:
The patent applies preliminary action by having the secondary device send an acknowledgment packet immediately after successfully receiving and decoding the audio data packet, before the primary device needs to request retransmission. This proactive acknowledgment mechanism allows the primary device to know in advance that the packet was successfully received, eliminating the need for retransmission and resolving the contradiction between reliability and transmission efficiency.
2Reliability
If retransmission is performed when primary device fails to receive packet, then packet delivery reliability improves, but total retransmission count increases
Solution Approach 1:
The patent implements feedback by having the secondary device send an acknowledgment packet back to the primary device indicating whether it successfully received and decoded the audio data. This feedback mechanism allows the primary device to adjust its transmission strategy - when acknowledgment is received, no retransmission is needed; when not received, retransmission is triggered. This resolves the contradiction by using feedback information to minimize unnecessary retransmissions and reduce time loss.
3Adaptability or versatility
If audio packet is transmitted in strong interfering environment or when blocked by user's head, then wireless communication can be maintained, but reception success rate decreases
Solution Approach 1:
The patent applies preliminary action by having the secondary device proactively send an acknowledgment packet immediately after successfully receiving and decoding the audio data packet. This preliminary acknowledgment, sent before any potential retransmission request, allows the primary device to confirm successful reception in advance, thereby maintaining reliable communication even in challenging environments with interference or signal blocking.
Solution Approach 2:
The patent implements feedback through the acknowledgment packet mechanism, where the secondary device provides real-time information about successful packet reception to the primary device. This feedback loop enables the system to adapt to challenging communication environments by confirming successful transmissions and avoiding unnecessary retransmissions, thereby maintaining high reception success rates despite interference or blocking conditions.
Data Source
AI summary
A method applied into a controller of a wireless Bluetooth device includes: providing a first flag and a second flag; asserting the first flag when the controller successfully receives the particular packet transmitted from the audio gateway; asserting the second flag when the controller successfully receives an acknowledgement from a secondary device wherein a reception of the acknowledgement indicates that the secondary device successfully receives the particular packet; and transmitting an acknowledgement of a particular packet to an audio gateway when the first flag and the second flag are asserted.