eNodeB Downlink Throughput Optimization via RTT Segmentation
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Solution Overview
Problem
Current wireless communication systems face issues with data loss, congestion, and battery power loss due to inefficient data transmission, particularly in high-data-volume environments like LTE networks, where downlink throughput is limited by round trip time variations and congestion, making it difficult to maintain reliable and efficient data transfer.
Innovation Solution
The implementation of a method that uses an evolved nodeB base station to monitor communication links and apply corrections by determining the difference between TCP and L2 air-interface round trip times, applying techniques such as delaying acknowledgments, dropping packets, or providing explicit congestion notifications to optimize downlink throughput and prevent congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If round trip time is used as a metric for data transmission optimization, then transmission timing can be managed, but it leads to inaccurate throughput measurement and failed detection of actual downlink deterioration
Solution Approach 1:
The patent segments the round trip time measurement into two distinct components: air-interface round trip time (measuring only radio transmission delay) and TCP layer round trip time (including processing and protocol overhead). By separating these measurements, the system can accurately attribute throughput variations to specific network layers, resolving the measurement accuracy problem caused by using aggregate RTT values.
Solution Approach 2:
The patent introduces an intermediary metric called air-interface RTT that acts as a mediator between the physical transmission layer and the TCP protocol layer. This intermediary measurement allows the system to isolate radio interface performance from higher-layer protocol effects, enabling accurate detection of downlink deterioration without the noise introduced by TCP processing variations.
2Productivity
If data transmission rate is increased to improve productivity, then downlink throughput increases, but congestion and data loss occur
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors air-interface RTT and compares it against threshold values. When RTT exceeds the threshold, indicating congestion or deterioration, the system automatically adjusts transmission parameters such as reducing data rate or increasing retransmission attempts. This closed-loop feedback ensures high throughput while maintaining transmission reliability by dynamically adapting to network conditions.
Solution Approach 2:
The patent applies dynamic adjustment of transmission parameters based on real-time network conditions. Instead of using fixed transmission rates, the system dynamically modifies data rates, buffer sizes, and retransmission strategies according to the measured air-interface RTT. This dynamic approach allows the system to maximize throughput during good conditions while preventing congestion and data loss during deteriorating conditions.
3Productivity
If transmission corrections are applied to optimize downlink throughput, then data transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies local quality by implementing corrections specifically at the base station (eNodeB) for downlink transmissions, rather than requiring changes throughout the entire communication stack. The base station independently measures air-interface RTT and applies appropriate corrections such as adjusting scheduling algorithms or modifying transmission parameters, isolating the complexity to a single network element while maintaining overall system efficiency.
Data Source
AI summary
A device, a method, a system, and a computer program product for transmitting data packets are disclosed. A communication link between a first device and a second device is established in accordance with a transmission control protocol for transmission of a data packet between the first device and the second device. The communication link is monitored during transmission of the data packet from the second device to the first device. Based on the monitoring, at least one correction of the communication link is performed during transmission of an acknowledgement of a receipt of the data packet by the first device to the second device.