In-Vehicle Handsfree Protocol Switching for Stable Call Data Transfer
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Solution Overview
Problem
Existing in-vehicle handsfree systems face complexity in establishing efficient communication links with cellular phones, particularly in managing outgoing and incoming call history data and phone book data transfers, which can lead to unstable connections and increased processing requirements.
Innovation Solution
The system employs a serial protocol switching method, initially connecting using a transfer protocol to transfer call history and phone book data, then disconnecting and switching to a handsfree protocol for phone calls, allowing for improved connectivity and reduced processing complexity by avoiding simultaneous connection of transfer and handsfree protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If both transfer protocol and handsfree protocol are connected simultaneously to cellular phone, then data transfer capability is improved, but device complexity and connection stability deteriorate
Solution Approach 1:
The patent segments the connection management into distinct phases: first establishing a transfer protocol connection for data transfer, then switching to a handsfree protocol connection for phone calls. This temporal segmentation avoids the complexity of managing simultaneous connections while ensuring both data transfer and handsfree functionality are achieved sequentially.
Solution Approach 2:
The system dynamically switches between different protocol connections based on operational requirements. The control unit monitors the connection state and automatically transitions from transfer protocol to handsfree protocol, optimizing the connection configuration at each moment rather than maintaining fixed simultaneous connections.
2Loss of information
If transfer protocol connection is maintained during handsfree protocol connection, then data transfer capability is improved, but connection stability deteriorates
Solution Approach 1:
The patent performs preliminary data transfer using the transfer protocol before establishing the handsfree protocol connection. By completing data transfer operations in advance, the system eliminates the need to maintain both connections simultaneously, thereby ensuring connection stability during handsfree operations while preserving complete data transfer capability.
3Adaptability or versatility
If multiple protocols are connected simultaneously, then functionality is improved, but processing requirements and complexity increase
Solution Approach 1:
The system implements periodic protocol switching rather than continuous simultaneous operation. The control unit periodically assesses which protocol should be active based on current operational needs, switching between transfer protocol and handsfree protocol in a structured sequence. This reduces software complexity by avoiding the need to manage multiple concurrent protocol states while maintaining adaptability to different operational requirements.
Data Source
AI summary
An in-vehicle navigation apparatus with a handsfree function establishes a Bluetooth communication link with a cellular phone. When receiving from the cellular phone outgoing call history data and incoming call history data, which were stored in the cellular phone before establishing the Bluetooth communication link, the in-vehicle navigation apparatus stores, in a work memory, the received outgoing call history data and the received incoming call history data, equally to, of the navigation apparatus itself, outgoing call history data and incoming call history data. An outgoing call operation then becomes possible using outgoing call history data and incoming call history data, which are stored in the work memory.