Bandwidth Allocation Apparatus for Low Latency and High Efficiency
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Solution Overview
Problem
Existing bandwidth allocation systems struggle to simultaneously achieve low latency for Low Layer Split (LLS) and high bandwidth utilization efficiency for High Layer Split (HLS) and Fiber to the Home (FTTH) applications using the same Time Division Multiplexing-Passive Optical Network (TDM-PON) system, as they require different cycle durations for dynamic bandwidth allocation.
Innovation Solution
A bandwidth allocation apparatus and method that acquires scheduling information for low-latency uplink data and receives requested amounts for non-low-latency data, allocating bandwidth in separate cycles to accommodate both cooperative DBA for LLS and SR-DBA for HLS and FTTH, allowing for flexible allocation based on available bandwidth and predetermined data amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single dynamic bandwidth allocation cycle is used for both LLS and HLS/FTTH, then low latency for LLS can be achieved, but bandwidth utilization efficiency for HLS and FTTH deteriorates
Solution Approach 1:
The patent divides the bandwidth allocation into two separate cycles: a first dynamic bandwidth allocation cycle for LLS that operates with shorter duration to achieve low latency, and a second dynamic bandwidth allocation cycle for HLS and FTTH that operates with longer duration to achieve high bandwidth utilization efficiency. This segmentation allows each service type to have optimized allocation parameters suitable for its specific requirements.
Solution Approach 2:
The system dynamically adjusts the bandwidth allocation cycle duration based on the service type. For LLS services requiring low latency, a shorter allocation cycle is used. For HLS and FTTH services where bandwidth utilization is more critical, a longer allocation cycle is employed. This dynamic adaptation enables the system to optimize performance for different service categories simultaneously.
2Productivity
If separate bandwidth allocation cycles are used for LLS and HLS/FTTH, then bandwidth utilization efficiency for HLS and FTTH is improved, but latency for LLS increases
Solution Approach 1:
The patent implements separate allocation cycles where the first cycle for LLS operates independently with optimized short duration parameters, while the second cycle for HLS and FTTH operates with longer duration parameters. This segmentation ensures that LLS latency requirements are met without compromising the bandwidth utilization efficiency of HLS and FTTH services.
Solution Approach 2:
The system changes the temporal parameter (allocation cycle duration) based on the service type. The first allocation cycle uses a shorter duration parameter optimized for low-latency LLS traffic, while the second allocation cycle uses a longer duration parameter optimized for bandwidth-efficient HLS and FTTH traffic. This parameter adaptation resolves the contradiction between latency and utilization efficiency.
3Loss of time
If cooperative DBA is used for LLS, then low latency transmission is achieved, but complexity of bandwidth allocation system increases
Solution Approach 1:
The patent segments the bandwidth allocation into two distinct processes: cooperative DBA for LLS and SR-DBA for HLS and FTTH. By separating these allocation mechanisms, the system can apply the simpler SR-DBA to the majority of traffic (HLS and FTTH) while using the more complex cooperative DBA only where necessary (LLS), thereby limiting the overall complexity increase.
Solution Approach 2:
The system implements a universal bandwidth allocation framework that can handle both cooperative DBA and SR-DBA modes within a single apparatus. The OLT is designed to support multiple allocation schemes, allowing it to function universally for different service types without requiring separate dedicated systems for each protocol.
4Productivity
If SR-DBA is used for HLS and FTTH, then bandwidth utilization efficiency is improved, but latency requirement for LLS cannot be met
Solution Approach 1:
The patent divides traffic into two categories and applies different allocation schemes: SR-DBA is applied to HLS and FTTH traffic to maximize bandwidth utilization efficiency, while cooperative DBA is applied to LLS traffic to ensure low latency transmission. This segmentation allows each service type to benefit from the allocation scheme best suited to its requirements.
Solution Approach 2:
The system applies different quality characteristics to different traffic types through the dual-cycle allocation mechanism. LLS traffic receives the low-latency treatment of cooperative DBA with shorter allocation cycles, while HLS and FTTH traffic receives the high-utilization treatment of SR-DBA with longer allocation cycles. This local optimization resolves the contradiction between latency and utilization efficiency.
Data Source
AI summary
A bandwidth allocation apparatus includes an acquisition unit acquiring scheduling information related to transmission of uplink data from a first subscriber line termination apparatus corresponding to a subscriber line termination apparatus needing to transfer uplink data with low latency, a requested amount reception unit receiving, from second subscriber line termination apparatus corresponding to a subscriber line termination apparatus not needing to transfer uplink data with low latency, information representing a requested amount related to transmission of uplink data from the second subscriber line termination apparatus, in a requested amount reception cycle corresponding to a cycle equal to or longer than a predetermined maximum round-trip time, and an allocation unit allocating, in an allocation amount determination cycle shorter than the requested amount reception cycle, a bandwidth to the uplink data from the first subscriber line termination apparatus on a basis of the scheduling information, and allocating, in the allocation amount determination cycle, a bandwidth to the uplink data from the second subscriber line termination apparatus on a basis of the information representing the requested amount.