Multipath Networking at Transport Layer. Babil (Golam Sarwar), Roksana Boreli (NICTA) Emmanuel Lochin (ISAE)
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1 Multipath Networking at Transport Layer Babil (Golam Sarwar), Roksana Boreli (NICTA) Emmanuel Lochin (ISAE)
2 Background New generation devices with multiple interfaces: e.g. iphone, Android, Various technologies e.g. WiMAX, WiFi, 3G,... User has various outgoing interfaces with various technologies How can we take benefit of this multiple connectivity in a Web2.0 and HTML5 context?
3 Our Proposal Idea: using multipath protocol MPTCP (Multipath TCP) CMT-SCTP (Concurrent Multipath SCTP) And many others in many layers Extending capabilities of MP protocols with: Path selection Dynamic CC selection Selectable reliability Switch between various reliability flavours and levels ARQ, FEC, selective retransmission, Objective: enhancing Quality of Experience (QoE)
4 What are the metrics? How to make the best use of availability of several interfaces at a time to improve user s QoE in terms of: Good-put (application throughput) Delivery delay Delivery ratio Our preferred protocol: CMT-SCTP Provides data simultaneous data transmission over multiple paths Partial Reliable transmission Message oriented transmission
5 Big Picture We propose a combination of: Information collection element From the network (e.g. RTT, loss ) From the user (e.g. data type, desired reliability, CC ) Decision Making element Execution element Decision Making could be based on: Path characteristics Object type Congestion Control of preference Desired reliability Price user is willing to pay Battery consumption Security
6 Block Representation of the Problem DE Interfaces Interface Selection Optional Optional DE Path Setup Path Selection Types of data objects QoE Available Interfaces Cost (Euros) Available E2E paths their characteristics Set Path For each data EE IE IE IE IE IE IE = Information Collection Entity DE = Decision Making Entity EE = Execution Entity Source: SAIL Project Meeting, Feb, 2011 Command Data
7 What do we need? Model of packet scheduling mechanism present inside MP Protocols (SCTP for instance) Objective: to model packets scheduling at the sender side and expectation of the windows How to assess the correct parameters? Simulations expected to infer such models To cross-check models and results
8 Simple Multipath Scenario Interface 0 Path 1 (p 1 ) Interface 0 Host A (e.g. Webserver) Host B (e.g. Firefox) Interface 1 Path 2 (p 2 ) Interface 1 If either of host A or B is multi-homed, they can benefit from multipath data delivery.
9 A Little on Jargons About SCTP features: TCP is byte-stream oriented, while SCTP is message oriented TCP has head-of-line-blocking, SCTP does not SCTP provides multi-homing, TCP does not Path (physical) Flow, Sub-flow (logical) Stream (logical)
10 Byte-stream vs. Message Oriented Data Send Data - Write() Receive Data - Read() Byte-stream Transmission (TCP) d 1 d 2 d 1 +d 2 Data remains sequential but boundaries may not be maintained. Message Based Transmission (SCTP, UDP) d 1 d 1 d 2 d 2 Data remains sequential and strict boundaries are maintained.
11 A Little on Jargons About SCTP features: TCP is byte-stream oriented, while SCTP is message oriented TCP has head-of-line-blocking, SCTP does not SCTP provides multi-homing, TCP does not Path (physical) Flow, Sub-flow (logical) Stream (logical)
12 Flow, Sub-flows and Streams in Multipath Interface 0 Path 1 (p 1 ) Interface 0 Host A (e.g. Webserver) Host B (e.g. Firefox) Physical Representation of Data Transmission Interface 1 Path 2 (p 2 ) Interface 1 Logical Representation of Data Transmission.
13 On the benefit of multi-stream/flow Traditional HTML5 Page Traditional HTML5 Data Delivery Bytes SND VID INDEX TXT IMG GET Time t 0 t 1 t 2 t 3 t 4 t 5 t 6 Most common HTML5 contents are: 1. Text 2. Image 3. Audio 4. Video Individual text, image, video and audio data are transmitted in individual packets using a single transmission path at a time.
14 Proposed Multipath Data Transmission Scheme Bytes Traditional HTML5 Data Delivery Proposed Multipath HTML5 Data Delivery Bytes VID SND Over Path 1 Over Path 2 TXT IMG Over Path 1 Over Path 2 INDEX INDEX GET Time GET Time t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 0 t 1 t 2 t 3 t 4 t 5 t 6 Individual text, image, video and audio data are transmitted in individual packets using a single transmission path at a time. Multiplexed text, image, video and audio data are transmitted within single packets using a multiple transmission paths at a time.
15 Next Step Proof of concept with illustrative simulations Measurements scenario (TBD) Analytical models of the data scheduling between sender s windows Finite state machine as an entry point for Model Checking State diagrams of data exchange Allows to use Formal Method (Advanced UML) in order to obtain a proof of protocol and to better model Use of Dynamic Weighted Fair Queuing (WFQ) (based on RTT, loss) Implementation in Linux/FreeBSD
16 Current Progress NS-2 simulations of MP protocols Preliminary measurements Figure: NS-2 simulation of reliable and ordered delivery of a single object over 2 paths using CMT- SCTP.
17 Thanks for Your Attention
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