Fronthaul U-Plane Modulation Compression for DU-RU Bandwidth
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Solution Overview
Problem
The increasing demand for transmission capacity in wireless communication systems, particularly in 5G networks, has led to a significant increase in the bandwidth requirements for the fronthaul interface between the DU and RU, resulting in higher installation costs and latency issues due to the separation of the DU and RU functions.
Innovation Solution
Implementing a modulation compression scheme that utilizes a shifting operation based on designated equations for binary phase shift keying (BPSK) and non-BPSK to optimize data transmission through the fronthaul interface, allowing for efficient data processing and reduced bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station is divided into DU and RU with increased transmission capacity, then the functionality and flexibility of the wireless communication system is improved, but the bandwidth requirements for the fronthaul interface increase leading to higher installation costs
Solution Approach 1:
The patent applies parameter changes by transforming the data representation format through modulation compression. It changes the numerical parameters of data (from standard format to modulation-compressed format using BPSK mapping) to reduce the bandwidth requirement while maintaining the same information content, thereby resolving the contradiction between functionality and bandwidth consumption
2Adaptability or versatility
If the base station is divided into DU and RU with increased transmission capacity, then the functionality and flexibility of the wireless communication system is improved, but the installation costs increase
Solution Approach 1:
By changing the data format parameter through modulation compression, the patent reduces the bandwidth requirement, which directly lowers installation costs for the fronthaul interface while preserving the functional benefits of DU-RU architecture
3Adaptability or versatility
If the base station is divided into DU and RU, then the functionality of the wireless communication system is improved, but latency issues occur due to the separation of DU and RU functions
Solution Approach 1:
The patent applies preliminary action by performing modulation compression at the DU before transmitting data to the RU. This pre-processing of data reduces the transmission time and bandwidth requirements, thereby mitigating latency issues that arise from the physical separation of DU and RU functions
Data Source
AI summary
According to an embodiment, a method performed by a distributed unit (DU) may comprise generating, based on a modulation compression scheme, a modulation value corresponding to information bits. The method may comprise generating, based on a shifting operation corresponding to the modulation compression scheme, user plane (U-plane) data corresponding to the modulation value. The method may comprise transmitting, to a radio unit (RU) through a fronthaul interface, a U-plane message comprising the generated U-plane data. In a case of binary phase shift keying (BPSK), the modulation compression scheme may be set to perform the shifting operation based on a designated first equation. In a case of non-BPSK, the modulation compression scheme may be set to perform the shifting operation based on a designated second equation.