Upstream Bandwidth Allocation by Arrival-Period Estimation
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Solution Overview
Problem
Existing bandwidth allocation methods in TDM-PON systems fail to account for processing latency and data gaps, leading to delays in upstream data transmission, particularly in mobile wireless communication systems.
Innovation Solution
A bandwidth allocation device and method that estimates the start position and length of upstream data arrival periods by considering processing latency and data amounts, using radio resource information and traffic monitoring to optimize bandwidth allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the OLT waits for required transmission amount notifications from all ONUs before determining bandwidth allocation, then the allocation can be accurately based on actual needs, but control delay increases
Solution Approach 1:
The OLT performs preliminary bandwidth allocation based on previously received required transmission amount notifications before the current allocation cycle begins. This allows the OLT to proactively allocate bandwidth without waiting for all ONUs to submit their requests, thereby reducing control delay while maintaining reasonable allocation accuracy based on historical data
Solution Approach 2:
The bandwidth allocation system dynamically adjusts between waiting for complete notifications (for accuracy) and making preliminary allocations (for speed). The OLT uses dynamic time-division multiplexing to allocate bandwidth in multiple phases within a single allocation cycle, allowing flexible adaptation to different ONU transmission needs while minimizing overall control delay
2Device complexity
If the transmission-permitted period does not account for processing latency and data gaps, then the allocation control is simpler, but upstream data transmission efficiency decreases
Solution Approach 1:
The OLT preliminarily determines the start position and length of transmission-permitted periods by accounting for processing latency and data gaps before actual data transmission begins. This preliminary calculation ensures that the allocated time periods are sufficient for complete data transmission without requiring complex real-time adjustments during transmission
Solution Approach 2:
The system uses feedback from required transmission amount notifications to continuously refine the estimation of processing latency and data gap characteristics. By monitoring actual transmission patterns and adjusting the transmission-permitted period calculations based on this feedback, the system optimizes transmission efficiency without requiring overly complex control mechanisms
Data Source
AI summary
A bandwidth allocation device is included in a communication system having a terminal station device and a terminal device and relaying upstream data, which is received from a communication terminal by a lower device connected to the terminal device, to an upper device connected to the terminal station device. The bandwidth allocation device includes a transmission-permitted period start position determining unit configured to estimate a start position of an arrival period in which the upstream data arrives at the terminal device from the lower device; a transmission-permitted period length determining unit configured to estimate a length of the arrival period based on an amount of upstream data to be transmitted from the lower device to the terminal device; and a bandwidth allocation unit configured to allocate a bandwidth to the terminal device based on the estimated start position and the estimated length of the arrival period.