Distributed Optical Line Terminal Bandwidth Allocation
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Solution Overview
Problem
In access networks, the aggregation of network users leads to complexity, expense, and high power consumption due to the oversubscription of uplink and shared downlink connections, which is challenging to manage effectively with traditional access multiplexer architectures.
Innovation Solution
Implementing a distributed architecture with a layered dynamic bandwidth assignment (DBA) system that controls oversubscription between remote PHY units and central access multiplexers, using a central unit and remote unit apparatus to dynamically allocate bandwidth based on upstream reports from optical network users, ensuring efficient bandwidth management across aggregated links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network users are aggregated to a traditional access multiplexer for dynamic bandwidth allocation, then bandwidth management effectiveness is improved, but device complexity, expense, and power consumption increase
Solution Approach 1:
The patent divides the traditional centralized access multiplexer into distributed network units (NUs), each capable of independent bandwidth management. This segmentation allows bandwidth allocation to be performed locally at each NU rather than requiring a single complex centralized device, thereby maintaining effective bandwidth management while reducing overall system complexity and power consumption at any single point.
2Productivity
If network users are aggregated to a traditional access multiplexer for dynamic bandwidth allocation, then bandwidth management effectiveness is improved, but power consumption increases
Solution Approach 1:
By segmenting the centralized access multiplexer into multiple distributed NUs, the power consumption burden is distributed across many low-power units rather than concentrated in one high-power device. Each NU performs bandwidth management for its local users with minimal power consumption, collectively achieving effective system-wide bandwidth management while significantly reducing total power requirements.
Solution Approach 2:
Each network unit autonomously performs bandwidth management for its own users without requiring constant centralized control. The NUs independently allocate bandwidth based on local user demands, eliminating the need for a power-intensive centralized processing system while maintaining effective bandwidth management across the entire network.
3Productivity
If uplink and shared downlink connections are oversubscribed to serve more users, then network capacity is improved, but link overload risk increases
Solution Approach 1:
The patent implements dynamic bandwidth allocation at each network unit, where bandwidth assignments are continuously adjusted based on real-time user demands and link conditions. This dynamic approach allows the system to safely oversubscribe connections by allocating bandwidth flexibly - granting more bandwidth when demand is low and restricting it when demand approaches link capacity - thereby increasing network capacity while preventing link overload.
Solution Approach 2:
The system employs feedback mechanisms where each network unit monitors its uplink and downlink traffic conditions and adjusts bandwidth allocations accordingly. This feedback loop enables the NUs to detect approaching link capacity limits and reduce allocations before overload occurs, allowing safe oversubscription that maximizes network capacity while maintaining reliability.
Data Source
AI summary
Examples relate to apparatuses, methods, and computer programs for a remote unit and a central unit of an optical line terminal. In particular, a central unit apparatus for an optical line terminal comprises one or more interfaces configured to communicate with one or more remote unit apparatuses via one or more communication links. The apparatus further comprises a processor configured to receive information on one or more upstream reports from the remote unit apparatuses, the upstream reports relate to one or more optical networks used by the remote unit apparatuses to communicate with a plurality of optical network users. The processor further determines information on bandwidth assignments for the plurality of optical network users based on the information on the one or more upstream reports and transmits the information on bandwidth assignments to the one or more remote unit apparatuses.