O-RU PRACH Detection Controls U-Plane Transmission
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Solution Overview
Problem
In O-RAN fronthaul systems, when no user equipment (UE) is present in a cell, interference from other cells and device noise are synthesized by the fronthaul multiplexer, leading to deteriorated demodulation performance in the radio access network node due to the transmission of uplink signals regardless of the presence or absence of UE.
Innovation Solution
A wireless device and an intermediate device that detect PRACH signals from user devices and control the transmission of U-Plane signals based on the detection results, ensuring that signals are only transmitted when a user device is present, thereby preventing interference and noise synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink signals are transmitted from multiple O-RUs regardless of UE presence, then the system maintains continuous signal transmission capability, but interference and device noise are synthesized by the FHM, deteriorating demodulation performance
Solution Approach 1:
The O-RU performs preliminary detection of PRACH signals before transmitting uplink signals to the FHM. By detecting the presence of UE through PRACH signal detection in advance, the system determines whether uplink signal transmission is necessary, thereby preventing the synthesis of interference and device noise when no UE is present.
Solution Approach 2:
The system dynamically controls the transmission of uplink signals based on real-time detection results. The O-RU adjusts its transmission behavior according to whether UE is detected, making the signal transmission dynamic rather than static, thus avoiding continuous transmission of harmful signals when unnecessary.
2Productivity
If the FHM synthesizes signals from multiple O-RUs continuously, then the system maintains signal processing capability, but demodulation performance deteriorates due to synthesis of interference when no UE is present
Solution Approach 1:
The O-RU performs preliminary detection of PRACH signals before transmitting uplink signals to the FHM. By detecting the presence of UE through PRACH signal detection in advance, the system determines whether uplink signal transmission is necessary, thereby preventing the synthesis of interference and device noise when no UE is present.
Solution Approach 2:
The system implements feedback control where the O-RU's transmission decision is based on detection feedback. The detection result of PRACH signals provides feedback to control whether uplink signals are transmitted, creating a closed-loop system that adjusts signal processing based on actual UE presence.
Data Source
AI summary
In order to appropriately transmit a signal, based on presence or absence of a user device, a wireless device according to the present disclosure communicates with an intermediate device that duplicates or synthesizes and transmits a signal between a radio access network node communicating with the user device via the wireless device, and a plurality of the wireless devices, detects a PRACH signal transmitted from the user device, and performs transmission of a U-Plane signal to the radio access network node via the intermediate device, based on a detection result of the PRACH signal by a detection unit.