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8. Wireless technology & Functions
8.1 Description of Wireless Functions
The wheelchair is equipped with advanced wireless capabilities, allowing users to control it
using a mobile phone. This functionality is made possible through Bluetooth 4.1 technology,
which conforms to the IEEE 802.15.4 Bluetooth standard.
• Protocol: Bluetooth 4.1
• Frequency Band: 2.4GHz ISM
• Frequency Range: 2.400GHz to 2.4835GHz
• Modulation Technique: GFSK (Gaussian Frequency Shift Keying)
• Spread Spectrum Technique: Frequency-Hopping
• Output Power: Range from +4dBm to -20dBm (with 4dB increments)
• Sensitivity: -93dBm (in BLE mode)
• Operational Distance: Less than 10 meters
8.2 Characteristics of Wirel
ess Technology Operation
For ensuring robust wireless security:
• Encryption at Application Layer: We utilize AES128 encryption, which is applied at the
hardware level to re-encrypt any interactive data.
• Dynamic Key Generation: The 128-bit initial key is generated based on the unique feature
code of the entities involved in the interaction. This key is recalculated and synchronized
continuously throughout the connection.
• Data Sequence Dynamics: Every communication data sequence undergoes constant change
due to the presence of dynamic random change codes and sequence codes. Actual data can
only be discerned following decryption.
• Connection Interruption Mechanism: If there are any discrepancies in the data or if several
illegal content verifications are detected, the connection is immediately terminated.
Additionally, the entity is added to a blacklist and will remain there until it is overruled or
removed.
• Reliable Signal Transmission: We ensure that the signal is transmitted precisely as
intended.
In the event that your mobile phone is unable to control the wheelchair effectively:
1. Immediate Action: Cease using the mobile phone immediately and resort to the manual
controls on the wheelchair.
2. Environment Check: Ensure that other wireless devices in the vicinity are removed or
turned off.
3. Reconnection: Reconnect your mobile phone to the wheelchair and attempt to control it
again using the mobile device.
4. Safety First: Refrain from using the mobile phone for wheelchair control until you can
confirm it operates the wheelchair accurately and reliably.
8.3 Measures for Wireless Se
curity
8.4 Addressing Wireless Con
nectivity Issues
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