Dynamic Timeslot Allocation in Optical Access Networks
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Solution Overview
Problem
Conventional optical access networks face inefficiencies in timeslot allocation, leading to bandwidth waste, failure to meet user requirements, and buffer overflow due to fixed-period allocation, especially in EPON and GPON protocols, which do not support optical splitting and result in long delays and difficulties for new devices to go online.
Innovation Solution
A method for dynamic timeslot allocation in optical access networks that adjusts transmission timeslots based on real-time bandwidth requirements, allowing additional timeslots to be allocated within the current period to match user demands, using a central office device to manage unoccupied timeslots and distribute them evenly across sub-periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed-period timeslot allocation is used in EPON/GPON protocols, then network management is simplified, but user bandwidth requirements cannot be met timely and buffer overflow occurs
Solution Approach 1:
The patent transforms the fixed-period timeslot allocation into a dynamic real-time allocation mechanism. The OLT receives bandwidth requirement notifications from ONUs during data transmission, and dynamically adjusts timeslot allocation in real-time based on actual需求的变化，rather than relying on predetermined fixed periods.
Solution Approach 2:
The patent implements a feedback mechanism where ONUs notify the OLT of their bandwidth requirements during data transmission. The OLT receives this feedback information, processes it, and adjusts the timeslot allocation accordingly. This closed-loop feedback system ensures that bandwidth requirements are met timely while maintaining manageable network control.
2Reliability
If additional timeslots are allocated within current period, then user transmission requirements are met timely, but timeslot allocation period must be extended
Solution Approach 1:
The patent segments the timeslot allocation period into multiple sub-periods. This segmentation allows the OLT to allocate additional timeslots within the current period without extending the overall allocation period. The sub-period structure enables flexible, granular timeslot distribution that meets user requirements while maintaining the original period duration.
3Device complexity
If conventional one-to-one connection approach is used, then connection management is simple, but optical splitting cannot be implemented and new devices have difficulty going online
Solution Approach 1:
The patent enables the OLT to serve multiple ONUs simultaneously with dynamic timeslot allocation, transforming the conventional one-to-one connection into a multi-functional system. The OLT can allocate timeslots to multiple ONUs based on their real-time bandwidth requirements, supporting optical splitting and enabling new devices to go online flexibly without increasing connection management complexity.
Data Source
AI summary
A method for timeslot allocation in an optical access network. The method is applied to a central office device. The method includes: receiving a first bandwidth requirement value sent by a first user terminal device when it is determined that an allocated bandwidth is less than a bandwidth required for data transmission and that a difference between the allocated bandwidth and the bandwidth required for data transmission is greater than a specified threshold; obtaining an unoccupied timeslot in each sub-period included in a first timeslot allocation period; updating, based on the first bandwidth requirement value and the unoccupied timeslot, a transmission timeslot occupied by the first user terminal device in each sub-period; and sending the updated transmission timeslot to the first user terminal device.