Reliability enhancement for LTE using MPQUIC in a mixed traffic scenario: A novel MPQUIC Selective Redundant Scheduling implementation
Authors
Markmøller, Christian ; Mogensen, Rasmus Suhr
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Pages
108
Abstract
Automatiserede systemer bliver stadig mere udbredte, og selvkørende køretøjer skaber et voksende behov for sikker og stabil kommunikation mellem køretøjer og infrastruktur. Nogle funktioner kræver, at beskeder leveres med høj pålidelighed. Denne afhandling undersøger, om transportlagets multi‑forbindelse (at bruge flere netværksveje samtidig) over LTE (4G‑mobilnet) kan understøtte sådan kommunikation i scenarier med blandet netværkstrafik, hvor datastrømme har forskellige krav. Vi finder, at moderne flerbanede transportprotokoller som MPTCP (Multipath TCP) og den nyere MPQUIC (Multipath QUIC) i deres standardudformning ikke er tilstrækkelige, fordi deres standard planlægningsmekanismer (schedulere) ikke kan sikre den ønskede pålidelighed i blandede trafikmønstre. MPQUIC er dog et godt udgangspunkt. Vi udvider derfor MPQUIC med en ny Selective Redundant Scheduler (SRE), som kan sende kopier af udvalgte data over flere forbindelser, men kun når det er nødvendigt for at opfylde pålidelighedskrav. Indledende tests i miljøer med pakkeforlis og varierende forsinkelse, baseret på reelle LTE‑målinger, viser, at SRE giver markant bedre pålidelighed end MPQUICs standardschedulere og samtidig er mere båndbreddeeffektiv end en fuldt redundant planlægger, der duplikerer al trafik. Arbejdet har resulteret i IPR (intellectual property rights).
Automated systems are becoming more common, and self-driving vehicles increase the need for secure and stable communication between vehicles and infrastructure. Some functions require messages to be delivered with high reliability. This thesis investigates whether transport-layer multi-connectivity (using multiple network paths at once) over LTE (4G mobile networks) can support such communication in scenarios with mixed network traffic, where data flows have different requirements. We find that state-of-the-art multipath transport protocols such as MPTCP (Multipath TCP) and the newer MPQUIC (Multipath QUIC) are not suitable in their default form, because their standard scheduling mechanisms cannot ensure the desired reliability under mixed traffic. However, MPQUIC provides a solid foundation. We extend MPQUIC with a novel Selective Redundant Scheduler (SRE) that can send copies of selected data across multiple paths only when needed to meet reliability targets. Initial tests in environments with packet loss and varying delays, based on real LTE measurements, show that SRE achieves much higher reliability than MPQUIC’s standard schedulers while using bandwidth more efficiently than a fully redundant scheduler that duplicates all traffic. This work has resulted in IPR (intellectual property rights).
[This abstract was generated with the help of AI]
Documents