Wired RRU Link Bypasses X2 Congestion for Railway Handovers
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Solution Overview
Problem
In high-speed railway scenarios, frequent cell handovers in mobile terminals lead to congestion and transmission delays on the X2 interface between baseband units (BBUs), affecting the validity and timeliness of user data, potentially causing handover failures.
Innovation Solution
Establishing a wired link between remote radio units (RRUs) belonging to different BBUs to bypass the X2 interface and external transmission network, allowing direct wired transmission of coordination information between BBUs, thereby improving transmission performance and avoiding congestion and delay impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordination information is transmitted through the X2 interface between BBUs, then the transmission follows the standard external network protocol, but congestion occurs and transmission delay increases
Solution Approach 1:
The patent introduces RRUs as intermediary devices to establish a direct wired transmission path between BBUs. Instead of transmitting coordination information directly through the X2 interface between BBUs, the information is routed through RRUs (BBU1→RRU1→RRU2→BBU2), creating a dedicated transmission channel that bypasses the congested external network and eliminates transmission delays while maintaining reliability
Solution Approach 2:
The patent segments the traditional BBU-to-BBU direct transmission path into multiple hops through RRUs. By dividing the transmission journey into smaller segments (BBU1 to RRU1, RRU1 to RRU2, RRU2 to BBU2), the system creates a distributed transmission network that avoids single-point congestion and improves overall transmission reliability
2Productivity
If coordination information is transmitted through the external transmission network, then network flexibility is maintained, but transmission delay and congestion occur
Solution Approach 1:
The patent uses RRUs as intermediary nodes to create a dedicated wired transmission path that bypasses the external transmission network for coordination information. This intermediary path (BBU1→RRU1→RRU2→BBU2) enables high-speed direct communication between BBUs, dramatically improving transmission efficiency and eliminating the delays associated with external network routing
Solution Approach 2:
The patent creates a parallel transmission path that copies the essential coordination function outside the traditional X2 interface. By establishing an alternative wired path through RRUs, the system replicates the coordination information exchange capability without relying on the congested external network, thereby improving productivity
Data Source
AI summary
A communication apparatus acting as a baseband unit (BBU) or being applicable to a BBU, and having instructions for obtaining first coordination information to be sent to a second BBU, determining, based on preset link information, a transmission link corresponding to the second BBU, the transmission link including a first remote radio unit (RRU) and a second RRU, the first RRU belonging to the BBU, the second RRU belonging to the second BBU, and the first RRU and the second RRU being connected through a wired link, sending the first coordination information to the first RRU, sending indication information to the first RRU, the indication information indicating to the first RRU to send the first coordination information to the second RRU through the wired link, the indication information having an identifier of the second RRU.