High-Frequency CCA Detection for 5G Hidden Node Mitigation
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Solution Overview
Problem
In high-frequency scenarios, especially above 6 GHz, the beamforming technology used in 5G NR systems leads to hidden node problems due to poor signal penetration and attenuation, causing misjudgment of channel availability during clear channel assessment (CCA), resulting in interference and reduced transmission efficiency.
Innovation Solution
A signal transmission method that includes performing clear channel assessment (CCA) detection, exchanging information with counterpart devices through indication signals, and adjusting transmission parameters to mitigate hidden node issues by ensuring accurate channel availability determination, using techniques like beamforming and modified LBT processes tailored for high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamforming technology is used in high-frequency scenarios (above 6 GHz), then transmission directionality and signal focus are improved, but hidden node problems occur due to poor signal penetration and attenuation causing misjudgment of channel availability
Solution Approach 1:
The patent applies preliminary action by performing Clear Channel Assessment (CCA) detection before data transmission to check channel availability. The sending device performs CCA detection on the target channel before transmitting data, and the receiving device performs CCA detection before sending indication signals. This preliminary channel assessment prevents hidden node conflicts by ensuring the channel is clear before transmission begins.
Solution Approach 2:
The patent implements feedback mechanisms where receiving devices send indication signals back to sending devices to confirm channel status and reception readiness. The feedback loop includes the receiving device detecting channel availability, sending an indication signal to the sending device, and the sending device adjusting its transmission based on this feedback. This closed-loop feedback system resolves hidden node problems by ensuring both parties confirm channel availability before and during transmission.
2Measurement precision
If CCA detection is performed on the target channel, then channel availability is assessed, but hidden node devices cannot detect the detection signal and misjudge the channel as idle
Solution Approach 1:
The patent introduces an intermediary indication signal mechanism that mediates between sending and receiving devices. The receiving device acts as an intermediary by detecting the CCA detection signal and sending an indication signal to the sending device, confirming that the channel is truly idle. This intermediary feedback resolves the hidden node problem by providing indirect verification of channel availability that overcomes the limitations of direct CCA detection in high-frequency beamforming scenarios.
3Reliability
If indication signals are exchanged between sending and receiving devices, then hidden node issues are mitigated, but transmission latency increases due to additional signaling overhead
Solution Approach 1:
The patent applies partial action by implementing indication signal exchange only when necessary - specifically when the receiving device needs to confirm channel availability to the sending device. The mechanism is triggered conditionally based on channel detection results rather than being continuously active. This selective application of the indication signal mechanism provides hidden node mitigation only when needed, minimizing unnecessary signaling overhead and latency while maintaining reliability.
Data Source
AI summary
A signal transmission method includes: performing (101) a clear channel assessment (CCA) detection on a predetermined spectrum to obtain a CCA detection result; exchanging (102) information with a counterpart device; and performing data transmission according to at least one of the detection result and the exchanged information.