Radio-over-Ethernet Line-Rate Synchronization for CPRI Auto-Negotiation
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Solution Overview
Problem
Existing communication systems face challenges in maintaining CPRI bit rate auto-negotiation when transport devices are introduced between communication devices, as there is no defined method to facilitate continuous auto-negotiation in higher layer networks.
Innovation Solution
Implement network devices that synchronize and negotiate line rates using alignment information, including line rate order, iteration time interval, and iteration start time, ensuring both devices reach the same synchronization state and lock the same line rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transport devices are introduced between communication devices, then network flexibility and scalability are improved, but CPRI auto-negotiation capability deteriorates
Solution Approach 1:
The patent introduces alignment information as an intermediary mechanism carried by transport devices to enable CPRI auto-negotiation between communication devices separated by transport equipment. The alignment information includes line rate order, iteration time interval, and iteration start time, which coordinate the negotiation process across multiple devices without requiring direct connection.
Solution Approach 2:
The patent implements preliminary configuration of alignment information in transport devices before CPRI auto-negotiation begins. By pre-setting the line rate order, iteration time interval, and iteration start time in the alignment information, the system ensures that all devices are ready to participate in the negotiation process smoothly, preventing negotiation failures when transport devices are involved.
2Manufacturing precision
If alignment information is exchanged between network devices, then line rate synchronization is improved, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential alignment parameters (line rate order, iteration time interval, iteration start time) from the full CPRI negotiation protocol and encapsulates them in a compact alignment information structure. This extraction allows synchronization to be achieved with minimal data exchange, reducing communication overhead while maintaining precision.
Solution Approach 2:
The alignment information mechanism serves multiple functions simultaneously: it conveys line rate negotiation parameters, establishes synchronization timing, and coordinates iteration processes across different network devices. By making the alignment information multi-functional, the patent reduces the need for separate control signals and minimizes overall communication overhead.
Data Source
AI summary
A method performed by a first network device comprises reaching a synchronization state with a first communication device based on alignment information of a first interface of the first network device. The alignment information of the first interface includes at least one of a line rate order for line rate iteration, an iteration time interval and an iteration start time. The method further comprises determining whether a second network device has reached the synchronization state with a second communication device at a same line rate as the first interface, wherein the second network device includes a second interface, and the second network device tries to reach the synchronization state with the second communication device based on the same alignment information as the first interface of the first network device. The method further comprises locking the same line rate at the first interface of the first network device.