eCPRI Fronthaul Interface for Multi-RAT Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in enhancing the stability of fronthaul transmission, particularly between the digital unit (DU) and radio unit (RU), especially when failures occur, and there is a need for efficient deployment and transmission methods that support multiple radio access technologies (RAT) and reduce fronthaul capacity.
Innovation Solution
The implementation of an enhanced common public radio interface (eCPRI)-based fronthaul interface for global system for mobile communications (GSM) that enables efficient packet transmission and mapping between GSM packets and extended antenna-carriers (eAxC), supporting multi-RAT through an eCPRI-based fronthaul interface, which includes generating frames, acquiring packets, and transmitting messages between DUs and RUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fronthaul transmission capacity is increased to support multiple RATs and enhance stability, then transmission reliability and versatility improve, but device complexity and infrastructure cost increase
Solution Approach 1:
The base station is segmented into distributed units (DU) and radio units (RU) that can be independently deployed and managed. The DU handles higher-layer protocols while the RU handles radio frequency operations, allowing the system to scale and adapt to different RATs without requiring complete system redesign, thus improving reliability while controlling complexity.
Solution Approach 2:
The fronthaul interface is designed with multi-RAT support capability, allowing a single infrastructure to handle multiple radio access technologies (GSM, UMTS, LTE, 5G). This universal interface uses standardized protocols and flexible resource allocation to maintain transmission stability across different RATs without proportionally increasing system complexity.
2Ease of manufacture
If fronthaul capacity is reduced to lower infrastructure cost, then deployment efficiency improves, but transmission reliability and multi-RAT support capability deteriorate
Solution Approach 1:
The system dynamically adjusts fronthaul transmission parameters such as bandwidth allocation, sampling rates, and protocol overhead based on the active RAT and traffic demands. This allows the fronthaul capacity to be optimized for each specific use case, enabling reliable multi-RAT support while minimizing unnecessary capacity provisioning and reducing deployment costs.
3Adaptability or versatility
If function split is applied to divide base station into DU and RU, then system flexibility and deployment options improve, but control plane and user plane stability during failure scenarios worsen
Solution Approach 1:
The fronthaul interface implements comprehensive feedback mechanisms including heartbeat signals, error detection and correction protocols, and automatic failure detection and recovery procedures. When failures occur in either DU or RU, the feedback system enables rapid detection and coordination of recovery actions, maintaining control plane stability despite the distributed architecture's inherent vulnerability to component failures.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transmission rate than a 4th generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the present disclosure, an apparatus of a distributed unit (DU) in a wireless communication system includes at least one transceiver, and at least one processor coupled with the at least one transceiver, and the at least one processor is configured to: generate a frame of global system for mobile communications (GSM); acquire a GSM packet corresponding to a timeslot of the frame, based on packetizing of the frame of the GSM; and control the DU to transmit a message including the GSM packet to a radio unit (RU) through an enhanced common public radio interface (eCPRI)-based fronthaul interface, and the message includes data corresponding to the GSM packet, information regarding a number of the frame, and/or information regarding a number of the timeslot.