Triggered Preamble Structure for Interference Immunity
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Solution Overview
Problem
Wireless local area network (WLAN) devices face interference issues due to legacy devices overpowering low-power, long-range transmissions, which are vulnerable to channel access contention and interference, especially in IoT applications where devices are distributed and battery-powered, requiring improved immunity to noise and interference.
Innovation Solution
A transceiver circuit and processing circuit configuration that generates a frame with a specific preamble structure different from legacy devices, triggered by a signal to defer transmissions and improve immunity to interference, including decoding transmission control parameters and selecting preamble structures based on signal strength and historical data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-power, long-range transmissions are used in IoT applications, then energy consumption is reduced and transmission distance is extended, but immunity to interference and noise deteriorates
Solution Approach 1:
The transmission frame is segmented into distinct parts with different preamble structures. The first part uses a legacy preamble structure compatible with traditional devices, while the second part uses a non-legacy preamble structure optimized for low-power, long-range transmissions. This segmentation allows the system to maintain compatibility with legacy devices while improving reliability for IoT applications through the specialized preamble structure that includes repeated patterns for better signal detection in noisy environments.
2Adaptability or versatility
If legacy preamble structure is used for transmission, then compatibility with legacy devices is maintained, but susceptibility to interference from legacy devices increases
Solution Approach 1:
Different parts of the transmission frame have different preamble structures tailored to their specific functions. The initial legacy preamble maintains compatibility and allows legacy devices to recognize the transmission, while the subsequent non-legacy preamble with repeated patterns provides enhanced immunity to interference for the actual data transmission. This local differentiation resolves the contradiction by applying the appropriate preamble structure in the appropriate location.
3Reliability
If trigger signal mechanism is implemented, then channel access contention is reduced and interference is deferred, but device complexity increases
Solution Approach 1:
A trigger signal mechanism is implemented where a trigger frame is sent beforehand to authorize specific devices to transmit. This preliminary action reserves the channel for authorized devices, preventing legacy devices from causing interference during the low-power, long-range transmission. The trigger signal includes a duration field that tells legacy devices how long to defer their transmissions, effectively resolving channel access conflicts without requiring complex real-time arbitration.
Data Source
AI summary
Aspects of the disclosure provide an apparatus that includes a transceiver circuit and a processing circuit. The transceiver circuit is configured to receive a trigger signal this is transmitted by another apparatus. The trigger signal triggers transmissions by a first group of apparatuses including the apparatus, and defers transmissions by a second group of apparatuses that interfere the transmissions by the first group of apparatuses. The processing circuit is configured to, in response to the trigger signal, generate a frame with a first preamble structure that is different from a second preamble structure that is used by the second group of apparatuses, and provide the generated frame to the transceiver circuit for transmission.