Passive Optical Network Bandwidth Allocation via ONU Indication
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Solution Overview
Problem
Traditional passive optical network systems face inefficiencies and increased complexity in downstream bandwidth transmission due to the need for all ONUs to parse data, leading to unnecessary processing and energy consumption, especially when bandwidth scheduling is not efficiently communicated.
Innovation Solution
The method involves an OLT performing downstream bandwidth allocation and sending results with ONU indication information, allowing only the intended ONU to process and receive traffic data within its allocated bandwidth, thereby reducing unnecessary parsing and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all ONUs parse downstream data to determine frame headers, then data can be correctly identified and routed, but processing complexity and energy consumption increase significantly
Solution Approach 1:
The patent segments the downstream data transmission process into two distinct phases: a control phase where the OLT transmits bandwidth allocation information containing destination identifiers, and a data phase where only the intended ONU processes its allocated data. This segmentation eliminates the need for all ONUs to parse every downstream frame, thereby reducing processing complexity while maintaining reliable data identification through the control information mechanism.
2Reliability
If all ONUs parse downstream data frame by frame, then data can be correctly routed, but energy consumption increases due to unnecessary processing
Solution Approach 1:
The patent implements preliminary action by having the OLT transmit bandwidth allocation control information before the actual data transmission. This control information预先 specifies which ONUs should process which data, allowing ONUs to skip parsing operations for data not intended for them. This preliminary notification mechanism maintains accurate data routing while dramatically reducing energy consumption by eliminating unnecessary parsing operations.
3Adaptability or versatility
If OLT performs real-time bandwidth scheduling without notifying ONUs, then scheduling flexibility is improved, but ONU processing efficiency decreases due to serial processing
Solution Approach 1:
The patent introduces a feedback mechanism where the OLT notifies ONUs of bandwidth scheduling results through control information transmission. This feedback loop allows ONUs to receive real-time scheduling decisions and process data in parallel based on their allocated bandwidth, transforming the system from serial processing to parallel processing while maintaining scheduling flexibility through the OLT's control capability.
4Reliability
If frame header parsing is performed on all downstream data, then data can be correctly identified, but time consumption increases due to serial processing
Solution Approach 1:
The patent segments the data processing task by dividing downstream transmission into control information phases and data phases. During control information phases, the OLT transmits bandwidth allocation details that identify destination ONUs. During data phases, only the designated ONUs process their allocated data, eliminating the time-consuming serial parsing performed by all ONUs on every frame while maintaining accurate data identification through the control information mechanism.
Data Source
AI summary
A downstream bandwidth transmission method for a passive optical network includes: an optical line terminal (OLT) sends downstream bandwidth allocation information in a downstream frame to a plurality of optical network units (ONUs); where the downstream bandwidth allocation information comprises a plurality of downstream bandwidth entries for the plurality of ONUs, each downstream bandwidth entry in the downstream bandwidth allocation information comprises ONU indication information for a respective ONU and downstream bandwidth feature information for the respective ONU, such that each of the plurality of ONUs receives respective traffic data within a downstream bandwidth allocated to the respective ONU.