RU Random Access Preamble Detection for Fronthaul Bandwidth Relief
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Solution Overview
Problem
The increasing demand for wireless communication capacity and the separation of base station functions into distributed units (DUs) and radio units (RUs) have led to a need for efficient identification of random access signals in the fronthaul interface, which is challenging due to the increased bandwidth requirements and installation costs.
Innovation Solution
The implementation of a radio unit (RU) and distributed unit (DU) with processors and memory, enabling the exchange of control plane messages containing extension type information for random access preamble detection, along with the transmission and detection of uplink messages, to facilitate efficient detection and reporting of random access preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If function split is applied to separate base station into DU and RU, then transmission capacity and flexibility are improved, but fronthaul bandwidth requirements and installation costs increase
Solution Approach 1:
The patent extracts the random access preamble detection function from the DU and relocates it to the RU. By taking out this specific function to the RU, the DU's processing burden is reduced, and the RU can perform detection locally without requiring extensive fronthaul bandwidth to transmit all detection data back to the DU.
Solution Approach 2:
The patent segments the base station functions into DU and RU with specific division: RU handles physical layer functions including the extracted preamble detection, while DU handles higher layer functions. This segmentation allows optimized resource allocation and reduces the bandwidth required for fronthaul communication by processing data locally at the RU.
2Adaptability or versatility
If function split is applied to separate base station into DU and RU, then system flexibility is improved, but installation costs increase
Solution Approach 1:
By extracting the preamble detection function to the RU, the system achieves better flexibility in function distribution without requiring excessive fronthaul bandwidth. This extraction reduces the complexity and cost of installation by minimizing the bandwidth infrastructure needed while maintaining the flexibility benefits of function split.
3Productivity
If RU performs random access preamble detection, then detection efficiency is improved, but control plane message complexity increases
Solution Approach 1:
The patent extracts the preamble detection function to the RU, which improves detection efficiency by performing detection locally. The control plane message complexity is managed by defining clear extension type information structures that the RU uses to communicate detection results to the DU, ensuring the added functionality doesn't overwhelm the control plane.
Solution Approach 2:
The patent introduces extension type information as a parameter change in the control plane messages. This allows the RU to perform advanced detection functions while communicating results to the DU in a structured manner that manages message complexity through standardized extension fields rather than completely new message types.
Data Source
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AI summary
A device of a radio unit (RU) can comprise a transceiver, at least one processor, and a memory for storing instructions. The instructions, when executed individually or collectively by the at least one processor, can cause the device to: acquire, from a distributed unit (DU), a control plane message comprising extension type information for detecting a random access preamble; and transmit, to the DU, an uplink message comprising information about random access preambles. The random access preambles can be detected on the basis of the extension type information. The extension type information can comprise indication information for detection random access preambles, and information about the maximum number of reporting random access preambles.