Vehicular Wireless Apparatus Paging Area Management
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Solution Overview
Problem
Vehicular wireless apparatuses face the challenge of maintaining continuous communication and reducing unnecessary location registrations when the accessory (ACC) switch is off, leading to increased load on the communications network and potential discrepancies in paging area information.
Innovation Solution
A vehicular wireless apparatus with a wireless device for communicating with base stations, a volatile memory for storing current paging area information, a nonvolatile memory for storing previous information, and control mechanisms to determine if the ACC switch has been turned on or off, activating the device only when necessary and resetting the volatile memory upon start-up to minimize redundant location registrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicular wireless apparatus continuously monitors and performs location registration when the ACC switch is on, then communication reliability is improved, but network load increases and redundant registrations occur
Solution Approach 1:
The apparatus performs location registration in advance when the ACC switch is turned on, before any communication needs occur. By pre-establishing the registration state, the system ensures communication reliability is ready without generating redundant registrations during actual communication operations.
Solution Approach 2:
The control device monitors the ACC switch state and uses this feedback to determine when location registration is necessary. When the ACC switch is turned off, the system uses stored paging area information to avoid attempting registration, thereby reducing network load while maintaining reliability when needed.
2Reliability
If the vehicular wireless apparatus writes paging area information to nonvolatile memory every time the ACC switch is turned off, then information persistence is improved, but memory lifespan decreases
Solution Approach 1:
The system changes the parameter of write frequency by only writing paging area information to nonvolatile memory when the ACC switch is turned off and the wireless device is in standby state. This parameter change reduces write operations to extend memory lifespan while maintaining information persistence through the power-off state.
Solution Approach 2:
The control device automatically determines when writing to nonvolatile memory is necessary by monitoring the ACC switch state and wireless device status. The system serves itself by using the standby state condition as the trigger for writing, eliminating the need for continuous or frequent manual writes.
3Measurement precision
If the vehicular wireless apparatus resets the volatile memory when the ACC switch is turned on, then communication accuracy is improved, but redundant location registrations occur
Solution Approach 1:
The control device performs a preliminary check of the ACC switch state before initiating location registration. By using this preliminary information, the system determines whether registration is actually needed, preventing redundant registrations while maintaining communication accuracy when the ACC switch is on.
Solution Approach 2:
The system uses feedback from the ACC switch state to control the location registration process. When the ACC switch is on, the control device checks whether registration is necessary before executing it, thereby avoiding redundant registrations while ensuring communication accuracy when needed.
Data Source
AI summary
A vehicular wireless apparatus continues a standby state even after an ACC switch of the vehicle is turned off. In the vehicular wireless apparatus, when it is determined that the ACC switch is turned from on to off, paging area information stored in a RAM (volatile memory) is stored in an EEPROM (nonvolatile memory). When the ACC switch is then turned from off to on, a power-on-reset is done for the whole of the vehicular wireless apparatus and paging area information stored in the RAM is reset. The paging area information stored in the EEPROM is then read. Whether a location registration should be newly done is determined based on the read paging area information.