PON Bandwidth Allocation for Low Latency Registration
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Solution Overview
Problem
The existing Passive Optical Network (PON) systems face delays in data transmission due to the quiet window during the ONU registration process, which cannot meet the low delay requirements of mobile services, especially for 5G applications, as it causes collisions and delays in uplink data transmission.
Innovation Solution
A data processing method and apparatus for PON systems that allocate a partial bandwidth to registered ONUs for sending data within a noisy window, allowing registered ONUs to send data frames while unregistered ONUs send registration signals, thereby reducing transmission delays and optimizing bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a quiet window is used during ONU registration to prevent collision, then registration reliability is improved, but uplink data transmission delay increases
Solution Approach 1:
The uplink bandwidth is segmented into multiple sub-bands, where some sub-bands are reserved for registration signals and others for data transmission. This allows registered ONUs to transmit data in sub-bands not occupied by registration signals, eliminating the need for a complete quiet window and reducing transmission delay while maintaining registration reliability.
Solution Approach 2:
The patent transitions from temporal segmentation (quiet window in time domain) to frequency-domain segmentation by dividing the uplink bandwidth into multiple sub-bands. This dimensional change allows simultaneous registration and data transmission in different frequency resources, resolving the contradiction between registration reliability and data transmission delay.
2Reliability
If the quiet window duration is increased to accommodate maximum distance difference, then registration completeness is improved, but system productivity deteriorates
Solution Approach 1:
The uplink bandwidth is divided into multiple sub-bands, with specific sub-bands allocated for registration signals. This segmentation allows the registration process to occur in parallel with data transmission in other sub-bands, reducing the impact on system productivity while ensuring complete registration of all ONUs regardless of distance.
Solution Approach 2:
The patent changes the parameter of bandwidth allocation by dynamically assigning different sub-bands for registration versus data transmission. This parameter change allows the system to maintain registration completeness for ONUs at maximum distance while minimizing the impact on overall system productivity through efficient resource utilization.
3Productivity
If multiple ONUs are allowed to register in the same quiet window, then registration efficiency is improved, but collision probability increases
Solution Approach 1:
The uplink bandwidth is segmented into multiple sub-bands, with dedicated sub-bands for registration signals. Multiple ONUs can simultaneously transmit registration signals in different sub-bands without collision, while registered ONUs can transmit data in other sub-bands. This segmentation resolves the contradiction by enabling parallel registration processes while maintaining reliability.
Solution Approach 2:
The patent moves from single-dimensional time-based quiet windows to two-dimensional time-frequency resource allocation. By assigning different frequency sub-bands for registration signals, multiple ONUs can register simultaneously in the same time window without collision, improving registration efficiency while maintaining reliability through frequency division.
Data Source
AI summary
Provided are a data processing method and apparatus for a Passive Optical Network (PON) system and a PON system. The method includes: a first partial bandwidth is allocated to a first Optical Network Unit (ONU) within a first time window, the first ONU having completed registration and being in a working state; and a first data frame from the first ONU is received within a time corresponding to the first partial bandwidth, and a second data frame from a second ONU is detected within the first time window, the second ONU having not completed registration.