Uplink Data Processing in Cascaded Passive Optical Networks
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Solution Overview
Problem
Cascading passive optical network (PON) technologies for applications like FTTR, POL, and FTTM requires intensive processing operations at each stage, leading to increased equipment complexity, energy costs, and limited miniaturization, especially in domestic settings.
Innovation Solution
A method for transmitting data in a downstream optical signal where the data is processed at the service layer, transport layer, and physical layer before transmission, with the service layer encapsulating data in sublayers of the transport layer, thereby reducing the processing load on subsequent PON stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intensive processing operations are performed at each PON stage to maintain protocol stack compatibility, then network functionality and compatibility are improved, but device complexity and energy consumption increase
Solution Approach 1:
The protocol stack processing is segmented between OLT and ONU, with the OLT performing service layer processing and encapsulation, while the ONU performs transport layer and physical layer processing. This segmentation allows each device to handle only specific processing tasks, reducing individual device complexity while maintaining overall network compatibility through coordinated processing.
Solution Approach 2:
The OLT performs preliminary encapsulation of service layer data into transport layer frames before transmission to the ONU. This preliminary action prepares the data in advance, so that the ONU receives pre-processed frames that require minimal additional processing, thereby reducing the processing burden and complexity at the ONU side.
2Reliability
If full protocol stack processing is performed at each PON stage, then data transmission reliability is improved, but energy consumption increases
Solution Approach 1:
Processing operations are segmented and distributed between OLT and ONU based on layer functionality. The OLT handles service layer encapsulation while the ONU handles transport and physical layer processing, eliminating redundant processing at each stage and reducing overall energy consumption while maintaining transmission reliability.
Solution Approach 2:
Instead of performing complete protocol stack processing at each PON stage, only the necessary partial processing specific to each device's role is performed. The OLT performs service layer encapsulation without full transport layer processing, and the ONU performs transport layer processing without redundant service layer operations, reducing energy waste from excessive processing.
3Adaptability or versatility
If heavy equipment with full OLT functionality is deployed in home gateways for cascaded PON, then network functionality is improved, but device size and miniaturization are limited
Solution Approach 1:
The OLT functionality is segmented between the central office OLT and the home gateway ONU. The home gateway ONU performs only transport layer and physical layer processing, which requires minimal hardware, enabling compact form factor and miniaturization while still supporting cascaded PON functionality through coordinated processing with the central office OLT.
Solution Approach 2:
The heavy service layer processing functions are extracted from the home gateway and relocated to the central office OLT. This extraction allows the home gateway equipment to be minimized to only the essential transport and physical layer components, enabling compact domestic deployment while maintaining full network functionality through the distributed processing architecture.
4Productivity
If service layer processing is performed at the OLT before transport layer encapsulation, then processing efficiency in subsequent stages is improved, but the OLT's processing load increases
Solution Approach 1:
Processing tasks are segmented between OLT and ONU based on computational capability and functional requirements. The OLT performs service layer processing which benefits from higher computational power available at the central office, while the ONU performs simpler transport layer processing, optimizing overall system productivity and utilizing available computation power efficiently across the network.
Data Source
AI summary
A method for uplink data transmission, implemented in an apparatus at a boundary between a first passive optical network and a second passive optical network and having a receive protocol stack and a transmit protocol stack. Data is received at a physical layer of the receive stack in a first uplink optical burst originating from the second passive optical network. The method includes in series, at a sublayer of the transport layer of the receive stack, referred to as an encapsulation level, transmitting the data directly to a service layer of the transmit stack, without processing by sublayers above the encapsulation level in the receive stack; successively processing in the transmission stack, by the service layer, by a transport layer and by a physical layer; and transmitting the data in a second uplink optical burst to the first passive optical network.