Multi-quiet zone ONU registration for 5G latency
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Solution Overview
Problem
Current passive optical network (PON) technologies face challenges in achieving low-latency ONU registration, particularly for 5G wireless services, as the typical 250 μs quiet zone exceeds the required 150 μs latency, leading to delays in wireless service reception.
Innovation Solution
Implementing a multi-quiet zone-based ONU registration method that uses a short 102 μs quiet zone, adjusting for ONU distance variations, and incorporating a multi-quiet zone dynamic bandwidth allocation engine to synchronize OLT and CU/DU devices, ensuring low-latency registration through a collaborative process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 250 μs quiet zone is used for ONU registration in typical PON, then legacy ONUs can be registered, but the latency requirement of 150 μs for 5G wireless services cannot be satisfied
Solution Approach 1:
The patent divides a single 250 μs quiet zone into multiple shorter quiet zones (e.g., first quiet zone of 102 μs, second quiet zone of 102 μs, third quiet zone of 102 μs). This segmentation allows the system to satisfy the 150 μs latency requirement for 5G wireless services by completing ONU registration within the first quiet zone, while still accommodating legacy ONUs that require the full 250 μs registration time through subsequent quiet zones.
2Loss of time
If a short 102 μs quiet zone is used for low-latency registration, then 5G wireless service latency requirement is satisfied, but legacy ONUs that require 250 μs cannot be registered
Solution Approach 1:
The patent segments the quiet zone into multiple intervals, where the first quiet zone (102 μs) serves low-latency 5G wireless services and subsequent quiet zones (additional 102 μs each) serve legacy ONUs requiring longer registration time. This segmentation enables the system to support multiple service types with different latency requirements within a single PON infrastructure.
Solution Approach 2:
The patent implements dynamic bandwidth allocation that adapts to different service types. The system dynamically assigns different quiet zone configurations based on service requirements: 5G wireless services receive allocation in the first quiet zone with 102 μs duration, while legacy services are allocated in subsequent quiet zones. This dynamic adaptation allows the system to optimize performance for different service types without compromising compatibility.
Data Source
AI summary
Disclosed is a method of registering a new optical network unit (ONU) to be performed by an optical line terminal (OLT). The method includes transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU, receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message, transmitting a serial number request message to a service region in which ONUs are present based on the received scheduling information, and when the serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits a serial number request message. The transmitting of the serial number request message is performed through a multi-quiet zone of a short period.