LPWAN Message Confirmation and Frequency Correction
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Solution Overview
Problem
LPWAN transceivers face challenges in confirming message delivery due to harsh operating conditions and the impracticality of sending individual confirmation messages, which results in packet loss and inefficiency.
Innovation Solution
A method for joint confirmation of multiple messages by including order information in each message, allowing for simultaneous confirmation, and using frequency error calculations to compensate for frequency mismatches between transmitter and receiver, enabling accurate frequency correction and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual confirmation messages are sent for each message, then delivery confirmation reliability is improved, but communication overhead and power consumption increase
Solution Approach 1:
The patent merges multiple individual confirmation messages into a single batched confirmation message. Instead of sending separate ACK/NACK messages for each data packet, the receiver accumulates confirmation status for multiple packets and transmits them together in one message, thereby reducing communication overhead while maintaining delivery confirmation reliability
Solution Approach 2:
The patent implements periodic batched confirmation where the receiver periodically sends consolidated acknowledgment messages for multiple received packets. This periodic batching approach reduces the frequency of individual confirmation transmissions, lowering power consumption and communication overhead compared to immediate individual confirmations
2Use of energy by moving object
If messages are sent in harsh conditions without confirmation, then power consumption is reduced, but packet loss increases
Solution Approach 1:
By combining multiple confirmation acknowledgments into single batched messages, the patent reduces the total number of transmission events required for confirmation. This merging approach maintains packet delivery reliability through comprehensive acknowledgment while significantly reducing power consumption compared to individual confirmation messages
3Device complexity
If frequency correction is not applied, then transmission simplicity is maintained, but frequency mismatch causes packet loss
Solution Approach 1:
The patent implements frequency correction using feedback from the receiver to the transmitter. The receiver measures the actual received frequency, calculates the frequency offset from the expected frequency, and sends this correction information back to the transmitter. The transmitter then adjusts its carrier frequency based on this feedback, eliminating frequency mismatch and improving packet delivery reliability
Solution Approach 2:
The patent replaces manual or fixed frequency tuning with automated frequency correction based on measured frequency offset. Instead of relying on precise mechanical frequency matching, the system uses electronic frequency adjustment driven by measured offset values, achieving better frequency alignment while maintaining system simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively confirms multiple messages with reduced overhead and power consumption while ensuring accurate frequency matching, thereby minimizing packet loss and improving transmission efficiency in LPWAN networks.
Implementation Method 1
A radio signal receiver determines a frequency of received signal and, knowing at which frequency transmission was to be performed, calculates error of frequency of received signal
Data Source
AI summary
Described is a method for joint confirmation of many messages in Low Power Wide Area Networks (LPWANs) including adding information on order of messages in transmitted data, parsing order data in messages on a receiving side, sending system message back to original transmitter where information on reception success is encoded bitwise in data field, so that each bit represents one successfully received message.