Multi-RAT Base Station CPRI Link Segmentation
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Solution Overview
Problem
Conventional multi-mode base stations can only support a single radio access technology over the CPRI link between the Radio Equipment Controller (REC) and the Radio Equipment (RE), limiting their ability to handle multiple radio access technologies simultaneously.
Innovation Solution
The method and device enable a base station to support multiple radio access technologies by determining the radio access technologies supported by its ports and transmitting data accordingly, using a bidirectional or dual-star link mode to facilitate the transmission of service and control data across multiple radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a CPRI link is used between REC and RE in a conventional multi-mode base station, then data transmission is established, but only a single radio access technology can be supported
Solution Approach 1:
The CPRI link is segmented into multiple virtual channels, where each virtual channel is assigned to a specific radio access technology. The REC divides the physical link into separate logical paths for different RATs (e.g., GSM, UMTS, LTE), allowing simultaneous support for multiple technologies while using a single physical connection.
Solution Approach 2:
The CPRI link is designed to serve multiple functions by implementing a multi-tenant architecture where a single physical interface handles multiple radio access technologies. The link layer protocol is enhanced to identify and route data for different RATs through the same physical medium, making the link universal rather than dedicated to a single technology.
2Adaptability or versatility
If multiple REC-RE interfaces are created for each radio access technology, then multi-mode support is achieved, but the number of physical cables and interfaces increases
Solution Approach 1:
Multiple logical interfaces for different radio access technologies are merged into a single physical CPRI interface. The system combines GSM, UMTS, LTE, and other RAT-specific interfaces into one unified physical connection between REC and RE, reducing the number of cables while maintaining full multi-mode functionality through virtualization and logical channel separation.
Data Source
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AI summary
The present invention provides a method and device for data transmission. The method for data transmission includes: when a base station supports multiple radio access technologies, determines radio access technologies respectively supported by two ports of the RE, and transmits data corresponding to the radio access technologies respectively through the two ports. With the technical solutions provided in embodiments of the present invention, the base station can support multiple radio access technologies and transmit service data and control data corresponding to multiple radio access technologies.