Interworking Gateway ECN Rate Adaptation
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Solution Overview
Problem
Wireless communication systems face challenges in providing explicit congestion notification (ECN) functionality across disparate networks, leading to inconsistent rate adaptation due to variations in network capabilities, where ECN is only effective when both endpoints support it, and outdated or non-compliant networks can cause interference and packet dropping.
Innovation Solution
An interworking gateway is introduced to facilitate ECN transparency by receiving congestion indications, modifying media to remove ECN markings, and requesting data rate adjustments from user equipment (UEs) to ensure seamless communication across ECN-capable and non-ECN-capable networks, enabling local rate adaptation without relying on other operators' network upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECN functionality is implemented end-to-end between UEs, then rate adaptation can be achieved, but communication fails when either endpoint or intermediate networks do not support ECN
Solution Approach 1:
The gateway acts as an intermediary between ECN-capable and non-ECN networks. It receives ECN-marked packets from ECN-capable networks, removes the ECN markings, and forwards them to non-ECN networks. This mediator approach enables ECN functionality to work reliably in heterogeneous network environments where not all endpoints or intermediate networks support ECN, resolving the contradiction between reliability and adaptability.
2Measurement precision
If ECN markings are preserved end-to-end, then congestion notification is accurate, but outdated or non-compliant network equipment causes packet dropping
Solution Approach 1:
The gateway extracts the ECN markings from packets at the appropriate network boundary. By removing ECN markings before packets enter non-ECN-capable networks, the system preserves congestion notification accuracy in ECN-capable segments while preventing packet dropping in non-compliant network segments. This extraction approach resolves the contradiction between measurement precision and reliability.
3Adaptability or versatility
If local rate adaptation is implemented at the gateway, then dependency on other operators' network upgrades is reduced, but additional network infrastructure is required
Solution Approach 1:
The gateway serves as an intermediary that implements local rate adaptation by monitoring ECN markings in incoming packets and dynamically adjusting the data rate of outgoing packets to the UE. This mediator functionality enables the network to achieve rate adaptation locally without requiring upgrades to other operators' networks, resolving the contradiction between adaptability and device complexity by concentrating the complex functionality in a single gateway element.
Data Source
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AI summary
A method for providing communications at an interworking gateway. From a first UE in a first network, a data rate adjustment request is received at the interworking gateway. The data rate adjustment request is provided from the first UE responsive to receipt of a congestion indication in media provided from a second UE in a second network.The rate adjustment request is processed so as to provide integration of Explicit Congestion Notification (ECN) functionality between the first and second networks.