OLT Packet Feature Detection for Timely ONU Awakening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In passive optical networks (PONs), optical network units (ONUs) cannot be awoken in time due to high delay requirements and small initial traffic rates, which is not supported by the existing PON port traffic detection method, leading to inadequate Quality of Service (QoS) and difficulty in configuring threshold values.
Innovation Solution
A method where the optical line terminal (OLT) receives a preset packet feature indicating the need to wake an ONU from an energy-saving mode, using a forced wake-up indication to awaken the ONU based on specific packet features, such as voice or video services, eliminating the need for an awaking threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If PON port traffic detection method is used to trigger awaking event, then energy-saving mode can be implemented, but QoS requirement cannot be met due to periodic sampling delay
Solution Approach 1:
The OLT performs preliminary classification of service packets into different queues based on QoS requirements before traffic detection. High-priority packets (voice, video) are separated into dedicated queues that can trigger immediate awaking events, while low-priority packets go into standard queues. This preliminary action enables the system to respond immediately to time-sensitive traffic without being constrained by periodic sampling intervals.
Solution Approach 2:
The traffic detection mechanism is segmented into multiple independent detection paths: one for high-priority packets (voice/video) and another for standard packets. The high-priority path uses event-driven detection that can trigger immediate awaking, while the standard path uses periodic sampling. This segmentation allows the system to meet strict QoS requirements for time-sensitive services while maintaining energy-saving benefits for less critical traffic.
2Reliability
If PON port traffic detection with threshold is used, then awaking can be triggered, but threshold configuration is difficult and requires network-specific analysis
Solution Approach 1:
The system changes the detection parameter from traffic rate threshold to packet type classification. Instead of comparing traffic volume against configurable thresholds, the OLT classifies packets based on their type (voice, video, data) using existing QoS classification mechanisms. This parameter change eliminates the need for complex threshold configuration while maintaining reliable awaking triggers, as packet type classification is already established in PON systems for QoS management.
Solution Approach 2:
The invention introduces service packet classification as an intermediary mechanism between traffic detection and awaking trigger. The classification process acts as a mediator that translates various service types into standardized queue assignments, which then feed into the traffic detection mechanism. This intermediary layer simplifies configuration by using existing QoS classification rules rather than requiring new threshold parameters.
3Reliability
If PON port traffic detection is used, then awaking can be triggered, but initial service traffic rate is too small to reach threshold
Solution Approach 1:
The OLT performs preliminary classification of service packets into different queues based on QoS requirements before traffic detection. High-priority packets (voice, video) are separated into dedicated queues that can trigger immediate awaking, while low-priority packets go into standard queues. This preliminary action enables the system to respond immediately to time-sensitive traffic without being constrained by periodic sampling intervals.
Solution Approach 2:
The system dynamically adjusts the detection mechanism based on service characteristics. For new services with initially low traffic rates, the system uses event-driven detection on high-priority queues that triggers immediately upon receiving any voice or video packet. This dynamic adaptation allows the system to respond to service initialization needs without being constrained by fixed threshold values that assume steady-state traffic patterns.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention disclose a method for awaking an optical network unit in a passive optical network, including: receiving, by an optical line terminal OLT, a service packet corresponding to an ONU in an energy-saving mode, where the service packet carries a packet feature, and the packet feature indicates a service type of the service packet; detecting, by the OLT, the packet feature of the service packet; and when the packet feature of the service packet is a preset packet feature of needing to awake the ONU, awaking, by the OLT, the ONU in the energy-saving mode. According to the technical solutions provided in the embodiments of the present invention, an ONU can be awoken from an energy-saving mode in time when a traffic rate at an initial service stage is small, and a high QoS requirement of a service is met.