Gated Adaptive CoDel for Time-Sensitive Network
draft-jaehwoon-icc-gacodel-00

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ICCRG                                                       Jaehwoon Lee
Internet-Draft                                        Dongguk University
Intended status: Informational                              Chongho Yoon
Expires: July 30, 2020                        Korea Aerospace University
                                                        January 31, 2020

           Gated Adaptive CoDel for Time-Sensitive Network
                     draft-jaehwoon-icc-gacodel-00

Abstract
   
   This draft proposes a gated adaptive CoDel algorithm that can operate
   in the Time-Sensitive Network (TSN) environment. Here, we define
   Virtual sojourn time, virtual Interval and virtaul Target that are
   only operate on non-blocking part of TSN.

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 Jaehwoon Lee              Expires July 30, 2020              [Page 1]
Internet-Draft          Gated Adaptive CoDel for TSN       Jan. 31, 2020

Table of Contents

   1.  Introduction.................................................2
   2.  Conventions and Terminology..................................3
     2.1.  Conventions used in this document........................3
     2.2.  Terminology  ............................................3
   3.  Gated adaptive Codel for TSN.................................3
   4.  Security Considerations......................................3
   5.  IANA Considerations..........................................3
   6. References....................................................4
   Author's Address.................................................4

1.  Introduction

   Bufferbloat means that there are excess number of packets stored in
   the buffer in the bottleneck part of the packet-switched network. 
   End-to-end latency, therefore, increases sharply due to the 
   bufferbloat[1]. CoDel AQM is one of the active queue management (AQM) 
   technique used to resolve the bufferbloat problem[2]. When a packet 
   enters the buffer, CoDel records the current time in the packet by 
   using the timestamp and computes the sojourn time on dequeue. Sojourn
   time, together with the initial INTERVAL and TARGET values set by the 
   user, is used to determine whether to discard the packet or not.
   
   Time-sensitive network (TSN) provides the deterministic arrival 
   service without delay for time-sensitive control traffic based on the 
   time triggered scheduling that is synchronized with the Time 
   Triggered Ethernet (TTE)[3-4]. In TSN, time is considered to be 
   slotted. Each slot is further divided into two minislots. The first 
   minislot is used to transmit time-sensitive control traffic. The 
   other is used to transmit asynchronous traffic. In other words, from 
   the point of view of asynchronous traffic, the gate is periodically 
   blocked at the time interval is assigned to the time-sensitive 
   control traffic. TSN provides reasonable scheduling to asynchronous 
   traffic through credit based shaper and strict priority algorithm[5]. 
   However, as the size of the first mini slot gets larger, the 
   bandwidth for asynchronous traffic decreases, and bufferbloat 
   phenomenon worsens . CoDel can resolve the bufferbloat problem that 
   may occur when transmitting the asynchronous traffic in TSN 
   environment. In this case, gated scheduler asks CoDel whether to 
   transmit the packet based on timing and scheduling information. When 
   the packet can be transmitted without being discarded, gated 
   
   
 Jaehwoon Lee              Expires July 30, 2020              [Page 2]
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