Wireless Sensor Frame Transfer With Selective Missing-Frame Requests
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Solution Overview
Problem
Existing data transmission methods between wireless sensors and gateways in star and mesh networks suffer from reduced speed and increased energy consumption due to excessive frame exchanges and latency, leading to shortened battery life in battery-powered sensors.
Innovation Solution
A method involving the emission of pre-identified data frames by sensors without waiting for query signals, along with a comparison of frame identifiers at the gateway to identify and request only missing frames, reducing unnecessary exchanges and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway asks sequentially for each data frame and waits for confirmation, then data transmission reliability is improved, but data transmission speed deteriorates
Solution Approach 1:
The gateway pre-identifies and requests multiple data frames in advance (e.g., 5 frames) instead of waiting for sequential confirmation. This preliminary action allows the sensor to transmit multiple frames continuously, improving speed while maintaining reliability through buffer management and retransmission of only lost frames.
2Reliability
If the gateway waits for each data frame confirmation, then data transmission accuracy is improved, but energy consumption increases
Solution Approach 1:
The sensor transmits data frames continuously without returning to sleep mode between frames when multiple frames are requested. This continuous transmission eliminates repeated wake-up cycles, reducing energy consumption while maintaining accuracy through the gateway's buffer management and selective retransmission requests.
3Reliability
If sequential frame requests are used, then data frame loss is reduced, but communication latency increases
Solution Approach 1:
The gateway requests multiple data frames in advance, allowing the sensor to prepare and transmit them sequentially without waiting for individual confirmations. This reduces communication latency by eliminating repeated request-wait cycles, while the gateway's buffering ensures reliable delivery through retransmission of only lost frames.
4Reliability
If multiple signal exchanges occur for each data frame, then data transmission reliability is improved, but battery duration is reduced
Solution Approach 1:
The sensor remains active and transmits multiple data frames continuously when requested, avoiding repeated transitions to sleep mode. This continuous operation reduces the number of wake-up cycles and associated signal exchanges, extending battery duration while maintaining reliability through the gateway's buffer management and selective retransmission.
Data Source
AI summary
A network (1) includes a gateway (2) and a wireless sensor (3). The gateway includes an emission means (4), a reception means (5), and a processing means (6). The wireless sensor (3) includes a reception means (8) and an emission means (7). A method for transferring data between the wireless sensor and a gateway includes the gateway emitting a first query signal (S5) to ask the wireless sensor to send a set of pre-identified data frames (DATA1, DATA2, DATA3), the wireless sensor emitting the set of pre-identified data frames, extracting the frame identifier (ID1, ID3) of each received data frame, and comparing each extracted frame identifier with a set of reference frame identifiers (REF). If a reference frame identifier (ID2) does not match, the gateway emits a second query signal (S6) to ask the wireless sensor for transmitting the data frame (DATA2) associated with the unmatched reference frame identifier.