Centralized Dynamic Bandwidth Allocation for Hybrid Access Networks
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Solution Overview
Problem
Hybrid access networks face complications in upstream bandwidth scheduling due to a lack of coordination between optical line terminals (OLT) and coax line terminals (CLTs) when using both fiber and copper transmission media, leading to potential transmission collisions and inefficient data transfer.
Innovation Solution
The implementation of a centrally managed dynamic bandwidth allocation (DBA) system, where the OLT calculates and compensates for transmission delays between customer premises equipment (CPE) and network elements (NE), ensuring that timeslots are allocated to avoid collisions and synchronize with data arrival, using MPCP messages encapsulated in GEM or XGEM frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate bandwidth scheduling is used for optical and electrical domains, then domain-specific optimization is achieved, but coordination between OLT and CLT deteriorates leading to transmission collisions
Solution Approach 1:
The patent merges the bandwidth scheduling functions of OLT and CLT into a unified centralized DBA system. The OLT performs both optical domain bandwidth allocation and electrical domain bandwidth allocation, eliminating the need for separate scheduling mechanisms and ensuring coordinated resource management across both domains.
Solution Approach 2:
The OLT acts as an intermediary that receives bandwidth requirements from CLT and finalizes the bandwidth allocation. This intermediary role ensures that electrical domain bandwidth requests are coordinated with optical domain resource availability, preventing transmission collisions while maintaining domain-specific optimization.
2Reliability
If centralized bandwidth management is implemented, then transmission coordination is improved, but system complexity increases
Solution Approach 1:
The centralized DBA function is segmented into distinct modules: receiving bandwidth requests from CLT, calculating optimal bandwidth allocation based on optical domain availability, and sending finalized allocation decisions. This segmentation manages OLT processing complexity by organizing the centralized management function into manageable, modular components.
3Productivity
If dynamic bandwidth allocation is used, then resource utilization is optimized, but transmission delay variability increases
Solution Approach 1:
The system implements feedback mechanisms where CLT reports bandwidth requirements to OLT, and OLT provides finalized bandwidth allocation decisions back to CLT. This feedback loop enables dynamic resource utilization optimization while allowing the system to adapt to changing traffic conditions and minimize transmission delays through iterative refinement of bandwidth allocation.
Data Source
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AI summary
An optical line terminal (OLT) configured to receive transmission requests from a plurality of both network elements (NE) and customer premises equipment (CPE), allocate a timeslot to each NE for transmission on an optical distribution network (ODN), and a timeslot to each CPE for transmission on an electrical distribution network (EDN), wherein each NE intermediates between the OLT and the CPEs. Included is a NE configured to transmit a timeslot to a CPE for transmission on an EDN allocated by an OLT, receive data frames from the CPE during the timeslot, and forward the data frames to the OLT without rescheduling. Also included is a method comprising sending a transmission request to an OLT, receiving a timeslot from the OLT for transmission on an EDN in response, transmitting data frames to a NE during the timeslot, wherein the NE forwards the data frames to the OLT without rescheduling.