Radio Unit Synchronization Topology Switching After Local Clock Loss
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Solution Overview
Problem
In disaggregated network architectures, radio units (RUs) lose synchronization from local sources, leading to unsynchronized states and RF transmission deactivation, causing service outages until synchronization is reacquired.
Innovation Solution
The RU switches to a synchronization topology that includes a distributed unit (DU) in the synchronization chain, allowing network timing distribution via direct or indirect connections, avoiding carrier deactivation and maintaining RF transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RU uses a local synchronization source, then the RU can operate independently without network timing distribution, but the RU loses synchronization and must deactivate RF transmissions causing service outages
Solution Approach 1:
The DU acts as an intermediary in the synchronization chain, receiving timing information from the O-RAN network and distributing it to the RU. This mediator role allows the RU to maintain synchronization through the DU without directly depending on local sources, thus preventing service outages while maintaining reliable timing distribution.
Solution Approach 2:
The synchronization topology is made dynamic by allowing the RU to switch between different synchronization sources (local source vs. network timing via DU). This dynamic capability enables the system to adapt to changing conditions, maintaining service continuity by transitioning to network timing distribution when local synchronization is lost.
2Productivity
If the RU switches to include the DU in the synchronization chain, then network timing distribution is enabled avoiding carrier deactivation, but the synchronization topology becomes more complex
Solution Approach 1:
The synchronization function is segmented into separate components: the O-RAN network generates timing information, the DU receives and processes it, and the RU uses it for synchronization. This segmentation allows each component to perform its specific function independently, simplifying the overall system architecture despite the distributed nature of the synchronization chain.
Solution Approach 2:
The DU serves multiple functions: it acts as a synchronization intermediary for the RU, maintains connection to the O-RAN network for timing information, and manages the switch between different synchronization topologies. This multi-functionality reduces the need for additional dedicated components, managing complexity while enabling service continuity.
3Reliability
If the RU maintains synchronization with a local source, then the RU can avoid network dependency, but synchronization loss leads to RF transmission deactivation and throughput impact
Solution Approach 1:
The system performs preliminary action by establishing the synchronization chain through the DU before synchronization is lost. The RU is pre-configured to use network timing distribution via the DU, so when local synchronization fails, the transition is seamless and RF transmissions continue without interruption, maintaining both independence and throughput.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a radio unit (RU) may synchronize a clock to a local synchronization source. The RU may send, to a distributed unit (DU), a notification to switch to a synchronization topology that includes the DU in a synchronization chain based at least in part on losing synchronization between the clock and the local synchronization source. The RU may receive timing information from the DU responsive to the notification. The RU may synchronize the clock to the timing information received from the DU. Numerous other aspects are described.