Wireless Device Beam Sweep Transmission for Hidden Terminal Problem
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Solution Overview
Problem
In wireless communication systems using high-frequency bands like the 60 GHz band, the hidden terminal problem occurs due to narrow beamwidths, leading to interference between signals, as other devices may not detect the transmission and assume the channel is idle, causing collisions.
Innovation Solution
Implementing a wireless communication device that performs beam sweep transmission using a determination controller to assess the unlicensed frequency band availability and transmits signals at different phases in the time domain before starting data transmission, ensuring the channel is clear and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow beamwidth is used for high-frequency wireless communication, then communication reliability is improved, but the hidden terminal problem occurs leading to signal collisions
Solution Approach 1:
The patent applies preliminary action by performing beam sweep transmission before actual data transmission. The base station transmits beam sweep signals in advance to occupy the channel and notify other devices of the upcoming transmission. This preliminary action allows receiving devices to detect the transmission intent before the main data signal is sent, preventing hidden terminal collisions while maintaining narrow beamwidth for reliable communication.
2Reliability
If beam sweep transmission is performed before data transmission, then the hidden terminal problem is reduced, but transmission time is increased
Solution Approach 1:
The patent implements periodic action by structuring the transmission process into distinct phases: beam sweep transmission occurs periodically before data transmission, and the cycle repeats for subsequent transmissions. The beam sweep signals are transmitted at regular intervals to maintain channel occupancy notification, creating a periodic pattern that balances collision prevention with efficient time utilization.
Data Source
AI summary
A wireless communication device that communicates wirelessly with another wireless communication device, the wireless communication device includes, a determination controller configured to determine whether or not an unlicensed frequency band is available, a signal generator configured to generate a first signal, and a transmitter configured to, when the unlicensed frequency band is available, transmit the first signal at different phases in a time domain using the unlicensed frequency band before starting to transmit a data signal.