One Way Latency Considerations for MPTCP
draft-song-mptcp-owl-06

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MPTCP                                                           F. Song
Internet Draft                                                 H. Zhang
Intended status: Informational              Beijing Jiaotong University
Expires: Dec 18, 2019                                           H. Chan
                                                                 A. Wei
                                                    Huawei Technologies
                                                          June 19, 2019

                 One Way Latency Considerations for MPTCP
                          draft-song-mptcp-owl-06

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Abstract

   This document discusses the use of One Way Latency (OWL) for
   enhancing multipath TCP (MPTCP). Several usages of OWL, such as
   retransmission policy and crucial data scheduling are analyzed. Two
   kinds of OWL measurement approaches are also provided and compared.
   More explorations related with OWL will be contribute to the
   performance of MPTCP.

Table of Contents

   1. Introduction ................................................ 2
   2. Conventions and Terminology.................................. 3
   3. Potential Usages of OWL in MPTCP............................. 3
      3.1. Crucial Data Scheduling................................. 4
      3.2. Congestion control...................................... 5
      3.3. Packet Retransmission................................... 6
      3.4. Bandwidth Estimation.................................... 6
      3.5. Shared Bottleneck Detection............................. 7
   4. OWL Measurements in TCP...................................... 7
   5. Security Considerations...................................... 8
   6. IANA Considerations ......................................... 8
   7. References .................................................. 8
      7.1. Normative References.................................... 8
      7.2. Informative Reference................................... 8
   Authors' Addresses ............................................. 9

1. Introduction

   The terminal hosts and the intermediate devices in the Internet both 
   have been equipped with more and more physical networkinterfaces 
   basically. The efficiency of interfaces, which had been widely 
   used in packet forwarding at the terminal hosts, had been confirmed 
   and utilized [RFC6419]. In addition,in order to aggregate more 
   bandwidths,reduce packet delays, and provide better service, the 
   increased capacity provided by multiple paths created by multiple 
   interfaces is used. Unlike traditional TCP [RFC0793], 
   many transport layer protocols, such as MPTCP [RFC6182] [RFC6824]
   enable the terminal hosts to concurrently transfer data on top of 
   multiple paths to greatly increase the overall throughput.

   Round-trip time (RTT) is commonly used in congestion control and
   loss recovery mechanism for data transmission. However,the key issue
   with data transmission is simply the delay in data transmission along
   the path that does not include the return. The uplink and downlink 
   delays between two peers can be very different. RTT can be

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   easily influenced by the latency in the oppsite direction along a 
   path, which does not accurately reflect the delay in data 
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