Transmission Control Apparatus Optimizing Downstream Data Efficiency
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Solution Overview
Problem
Conventional Gigabit Ethernet PON systems face inefficiencies in downstream data transmission due to the need for increased Gate frames in networks with a large number of optical network units, which prolongs data transmission times and reduces efficiency.
Innovation Solution
A transmission control apparatus that calculates and notifies each optical network unit of a transmission wait time based on round trip time and distance, allowing them to delay Report frame transmission and reducing the number of Gate frames required, thereby improving downstream data transmission efficiency without modifying grant periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of Gate frames is increased to support more ONUs, then the network can accommodate more connected units, but the downstream data transmission time is prolonged and transmission efficiency deteriorates
Solution Approach 1:
The OLT transmits a single Gate frame in advance that contains transmission wait time information for all ONUs. Each ONU uses this pre-provided wait time to delay its Report frame transmission appropriately, eliminating the need for multiple sequential Gate frames and thereby resolving the contradiction between supporting multiple ONUs and maintaining downstream transmission efficiency
Solution Approach 2:
The invention changes the parameter of Gate frame transmission from multiple frames sent sequentially to a single frame containing wait time parameters for all ONUs. This parameter transformation allows the system to accommodate multiple ONUs while keeping downstream data transmission time constant, thus resolving the efficiency deterioration issue
2Quantity of substance
If multiple Gate frames are transmitted to accommodate more ONUs, then more units can be supported, but the grant period is occupied longer reducing downstream data transmission time
Solution Approach 1:
The invention merges the function of multiple Gate frames into a single Gate frame by incorporating transmission wait time information for all ONUs in one frame. This consolidation reduces the number of Gate frames from multiple to one, freeing up grant period time for downstream data transmission and eliminating the time loss contradiction
Solution Approach 2:
By providing all necessary transmission wait time information in a single preliminary Gate frame, the system eliminates the need for subsequent Gate frames, thereby recovering the time that would have been spent transmitting multiple frames and making it available for downstream data transmission
Data Source
AI summary
In a transmission control apparatus, connected communication devices are detected to find round trip time of transmission to each of the detected communication devices, and the order of each communication device is determined on the basis of the round trip time of transmission to that communication device depending upon the distance thereto. On the basis of the round trip times of transmission to, and the orders of, the communication devices, transmission wait times are determined for delaying transmission of control signals from the communication devices to notify the communication devices of the transmission wait times. When starting communication with the communication devices, timer start signals prompting the communication devices to start counting the transmission wait time are transmitted to the communication devices.