Wireless Fronthaul SRS Ordering for Lower DU Memory Load
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Solution Overview
Problem
The increasing data transmission capacity in wireless communication systems, particularly in 5G, leads to a high memory burden in digital units (DUs) due to the storage of sounding reference signals (SRS) and requires efficient management of fronthaul interfaces between digital units (DUs) and radio units (RUs).
Innovation Solution
A method and device for controlling SRS transmission on the fronthaul interface by configuring a transmission order of user plane messages through a management plane, utilizing a configuration message that includes information for extended antenna-carriers (eAxCs), and exchanging capability information between DUs and RUs to optimize SRS handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission capacity is increased in wireless communication system, then data rate is improved, but memory burden of DU increases due to storage of SRS
Solution Approach 1:
The patent extracts the SRS storage function from the DU by implementing a separate buffer in the RU. The RU now stores the SRS received from the terminal and forwards it to the DU, eliminating the need for DU to allocate memory for SRS storage while maintaining the ability to process SRS for channel estimation.
Solution Approach 2:
The patent introduces the RU as an intermediary between the terminal and DU for SRS handling. The RU acts as a buffer holder that receives SRS from the terminal, stores it temporarily, and forwards it to the DU when needed, thereby reducing the memory burden on the DU while preserving full SRS functionality.
2Productivity
If function split is applied to separate base station into DU and RU, then transmission capacity is improved, but device complexity increases due to fronthaul interface management
Solution Approach 1:
The patent segments the base station functions into DU and RU with clearly defined interfaces. The fronthaul interface is divided into distinct planes (management plane for configuration, user plane for data transmission), allowing each unit to operate independently with well-specified responsibilities, thereby managing complexity through functional segmentation.
Solution Approach 2:
The patent implements dynamic capability exchange between DU and RU where the DU can query RU capabilities and configure the RU accordingly. This dynamic adaptation allows the system to optimize performance based on actual hardware capabilities while maintaining a standardized interface framework, reducing complexity through flexible configuration rather than rigid design.
Data Source
AI summary
A method of performed by a digital unit (DU) in a wireless communication system includes transmitting, to a radio unit (RU), a configuration message on a management plane, and receiving, from the RU, a plurality of user plane messages based on the configuration message, and the configuration message is used to configure a transmission order of the plurality of user plane messages, and the plurality of user plane messages correspond to a plurality of extended antenna-carriers (eAxCs).