Cooperative Dynamic Bandwidth Allocation for Low-Latency Optical Mobile Networks
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Solution Overview
Problem
Current optical access networks face challenges in achieving low-latency data transmission when combined with mobile networks, particularly in supporting augmented and virtual reality services, due to the lack of efficient bandwidth allocation methods that can reduce upstream latency.
Innovation Solution
A cooperative dynamic bandwidth allocation (CO-DBA) method is introduced, where a separated base station and a time division multiplexing (TDM)-based optical access network share bandwidth allocation information to enable low-latency data transmission. This involves the central unit (CU) and/or digital unit (DU) receiving bandwidth requests from user equipment (UE), determining scheduling, and transmitting allocation information to the optical line terminal (OLT) and optical network unit (ONU), allowing for advanced bandwidth allocation and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional bandwidth allocation methods are used in optical access networks combined with mobile networks, then system complexity is reduced, but upstream latency increases and low-latency services cannot be supported
Solution Approach 1:
The patent implements advance bandwidth allocation where the OLT determines and allocates upstream bandwidth for future time-slots before the actual data transmission occurs. The OLT receives bandwidth requests from ONUs, calculates appropriate bandwidth allocation in advance, and communicates this allocation to the ONUs before they need to transmit data, thereby reducing upstream latency while maintaining manageable system complexity through structured advance planning
Solution Approach 2:
The patent divides the optical access network into segmented time-slots for different operations: uplink data transmission time-slots, bandwidth request time-slots, and bandwidth allocation notification time-slots. This segmentation allows the system to handle bandwidth allocation and data transmission separately in advance, reducing upstream latency for data while keeping the overall system complexity manageable through structured temporal division
2Speed
If advance bandwidth allocation is implemented to reduce upstream latency, then data transmission speed improves, but system complexity and coordination requirements increase
Solution Approach 1:
The patent merges the mobile network base station functions with the optical access network OLT functions into a unified scheduling entity. The OLT performs both optical access network bandwidth allocation and mobile network uplink scheduling, eliminating the need for complex coordination between separate entities and enabling fast advance bandwidth allocation that improves data transmission speed while managing complexity through functional integration
Solution Approach 2:
The OLT is designed with multi-functionality to handle both traditional optical access network tasks and mobile network scheduling tasks. It can process bandwidth requests from multiple types of ONUs, allocate bandwidth for different service types (enhanced mobile broadband, ultra-reliable low-latency communications, massive machine-type communications), and manage multiple time-slots, thereby improving data transmission speed across diverse services while managing complexity through a universal scheduling platform
Data Source
AI summary
A cooperative dynamic bandwidth allocation (CO-DBA) method in a structure in which a mobile network and an optical access network are combined allows the mobile network and the optical access network to share mobile scheduling information in advance and allocate bandwidths in advance, and thus prevent a latency in upstream transmission of mobile traffic.