Low Power Radio Device Channel Sensing for Interference Avoidance
Solution Overview
Problem
Low power radio devices face interference and transmission failures due to high power radio devices, leading to increased retransmission rates and energy consumption, as their signals are not recognizable in shared wireless environments.
Innovation Solution
A radio resource sharing method for low power radio devices that involves buffering frames, detecting the state of radio resources in a medium interframe space (MIFS), and adjusting transmission times based on the state, with adaptive setting of MIFS considering interference from multiple wireless connection protocols to minimize collisions and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low power radio device transmits continuously without checking channel state, then transmission efficiency is improved, but collision and interference with high power radio devices increases
Solution Approach 1:
The low power radio device performs channel sensing in the MIFS period before transmitting data frames. This preliminary action of detecting channel state allows the device to avoid transmissions that would collide with high power radio devices, thereby improving both transmission efficiency and reliability by preventing collisions before they occur.
Solution Approach 2:
The device continuously monitors the channel state during MIFS periods and uses this feedback information to adjust its transmission decisions. When the channel is detected as busy, the device defers transmission; when idle, it proceeds with transmission. This feedback mechanism enables adaptive transmission behavior that resolves the contradiction between efficiency and reliability.
2Adaptability or versatility
If low power radio device uses standard interframe space, then protocol compatibility is maintained, but transmission collisions with high power radio devices occur
Solution Approach 1:
The invention applies different interframe space durations selectively: using standard SIFS for protocol compatibility while extending to MIFS for channel sensing and collision avoidance. This local differentiation allows the device to maintain protocol compatibility where needed while improving reliability through extended sensing periods in interference-prone environments with high power radio devices.
3Reliability
If low power radio device performs carrier sensing before each transmission, then collision avoidance is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous carrier sensing, the low power radio device performs sensing periodically during MIFS periods between transmissions. This periodic action reduces energy consumption compared to continuous monitoring while still providing adequate collision avoidance by checking channel state at regular intervals when the device intends to transmit.
4Reliability
If low power radio device transmits at higher power to overcome interference, then signal recognizability is improved, but energy consumption and interference to other devices increases
Solution Approach 1:
The device performs preliminary channel sensing during MIFS to detect the presence of high power radio devices before transmitting. This advance detection allows the low power device to choose appropriate transmission parameters or defer transmission, avoiding the need to continuously increase power to overcome interference, thereby reducing energy consumption while maintaining signal recognizability when transmission is appropriate.
Data Source
AI summary
A low power radio device and a radio resource sharing method for the low power radio device are provided. In the low power radio device, a channel state (CS) is detected by carrier sensing before transmission of each frame to reduce interference and a need of retransmission of each frame, accordingly, reducing energy consumption.