Bandwidth Allocation for TDM-PON Mobile Fronthaul Latency
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Solution Overview
Problem
In TDM-PON systems for mobile fronthaul, uplink signals exceeding the transmission capacity are discarded due to latency requirements, limiting the number of termination apparatuses that can transmit data within the designated time.
Innovation Solution
A bandwidth allocation apparatus that acquires request information, determines possible bandwidth allocation, and allocates bandwidth to maximize the number of termination apparatuses capable of transmitting data within the designated time, using a head position acquisition unit to define bandwidth allocation times and prioritize apparatuses for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth is allocated to maximize the number of termination apparatuses transmitting data within designated time, then the number of apparatuses meeting latency requirements is improved, but the transmission capacity constraint causes some apparatuses to have their signals discarded
Solution Approach 1:
The patent changes the parameter of bandwidth allocation by introducing a selection mechanism that identifies termination apparatuses capable of transmitting within the designated time based on available transmission capacity. The bandwidth allocation amount definition unit calculates and allocates bandwidth dynamically to selected apparatuses, changing the allocation parameters to maximize the number of successful transmissions while respecting the transmission capacity constraint C.
2Productivity
If transmission capacity is increased to accommodate more uplink signals, then the number of apparatuses that can transmit within latency requirement is improved, but the transmission speed of the PON link becomes a limiting factor
Solution Approach 1:
The patent segments the total transmission capacity C among multiple termination apparatuses based on their individual bandwidth requirements and timing constraints. Instead of treating the PON link as a single resource, the bandwidth allocation amount definition unit divides the capacity into allocable portions for different apparatuses, selecting which apparatuses receive bandwidth allocation to maximize the number of successful transmissions within the latency requirement.
3Adaptability or versatility
If all termination apparatuses are allocated bandwidth, then the number of apparatuses attempting transmission is improved, but the total transmission speed exceeds the PON link capacity causing signal discard
Solution Approach 1:
The patent applies partial action by allocating bandwidth to only those termination apparatuses that can transmit within the designated time, rather than allocating to all apparatuses. The bandwidth allocation amount definition unit determines the subset of apparatuses that can be served within the transmission capacity constraint C, providing bandwidth allocation only to this partial set, thereby avoiding signal discard while still maximizing the number of successful transmissions.
Data Source
AI summary
A bandwidth allocation apparatus includes a request information acquisition unit configured to acquire request information indicating a required amount for a bandwidth allocation by using a communication link separated from a data link used in data communication, a determination unit configured to determine, on the basis of the request information, whether the bandwidth allocation that allows transmission of data within the designated time, to a termination apparatus is possible, and a bandwidth-allocation amount definition unit configured to, in a case where the bandwidth allocation to the termination apparatus is determined not to be possible, specify some termination apparatuses to which the bandwidth allocation that allows transmission of data within the designated time, is possible, define a bandwidth allocation amount for a specified termination apparatus, and allocate the defined bandwidth allocation amount to the specified termination apparatus.