Dynamic Bandwidth Allocation in Optical Access Networks
Summary
Dynamic bandwidth allocation (DBA) lies at the heart of modern optical access networks, ensuring that upstream capacity is assigned to multiple users or services in real time. In a typical passive optical network (PON), a central controller at the optical line terminal (OLT) polls distributed optical network units (ONUs) for their instantaneous traffic demand and then grants time-slots or wavelengths in an adaptive manner. This contrasts with static allocation, where fixed shares of bandwidth can lead to under-utilisation at low load or congestion when demand surges. Advances in DBA schemes now encompass hybrid time- and wavelength-division multiplexing, predictive demand forecasting and energy-aware mechanisms that balance throughput, latency and power consumption. Such innovations support the growth of bandwidth-intensive applications—ultra-high-definition video, cloud gaming, virtual reality and industrial Internet of Things—while maintaining stringent quality-of-service guarantees. Moreover, the universality and low operating cost of fibre-to-the-home and fibre-to-the-premises deployments underscore the global significance of flexible DBA: rural and urban operators alike can deliver gigabit services over existing infrastructure. Continued research seeks to refine decision criteria, reduce polling overhead, harmonise upstream and downstream allocations and integrate software-defined networking controls to meet future access demands.
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Dynamic Bandwidth Allocation in Optical Access Networks publication trend
The graph below shows the total number of articles in dynamic bandwidth allocation in optical access networks across all publications each year (not limited to Nature Index journals).
Technical terms
Optical access network: A telecommunications network that delivers data, voice and video services from a central office to end users via optical fibre.
Passive optical network (PON): A point-to-multipoint fibre architecture using passive splitters to serve multiple premises without active electronics in the distribution.
Optical line terminal (OLT): The central node in a PON that manages upstream bandwidth allocation and downstream transmission.
Optical network unit (ONU): The customer-side device that transmits and receives optical signals over the PON and reports queue status to the OLT.
Dynamic bandwidth allocation (DBA): A protocol by which the OLT dynamically assigns upstream time-slots or wavelengths to ONUs based on real-time demand.
Time-division multiplexing (TDM): A technique that divides a transmission channel into time-based slots to separate multiple data streams.
References
- Optimization of the Decision Criterion for Increasing the Bandwidth Utilization by Means of the Novel Effective DBA Algorithm in NG-PON2 Networks. Future Internet (2023).
- Hybrid hierarchical aggregation with semi dynamic optical line terminal distribution algorithms optimization for ethernet passive optical networks. Optical and Quantum Electronics (2023).
- QoS-Aware Multicast for Crowdsourced 360° Live Streaming in SDN Aided NG-EPON. IEEE Access (2022).
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