Evaluation Test Cases for Interactive Real-Time Media over Wireless Networks
RFC 8869

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Internet Engineering Task Force (IETF)                         Z. Sarker
Request for Comments: 8869                                   Ericsson AB
Category: Informational                                           X. Zhu
ISSN: 2070-1721                                                    J. Fu
                                                           Cisco Systems
                                                            January 2021

  Evaluation Test Cases for Interactive Real-Time Media over Wireless
                                Networks

Abstract

   The Real-time Transport Protocol (RTP) is a common transport choice
   for interactive multimedia communication applications.  The
   performance of these applications typically depends on a well-
   functioning congestion control algorithm.  To ensure a seamless and
   robust user experience, a well-designed RTP-based congestion control
   algorithm should work well across all access network types.  This
   document describes test cases for evaluating performances of
   candidate congestion control algorithms over cellular and Wi-Fi
   networks.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8869.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
   2.  Cellular Network Specific Test Cases
     2.1.  Varying Network Load
       2.1.1.  Network Connection
       2.1.2.  Simulation Setup
       2.1.3.  Expected Behavior
     2.2.  Bad Radio Coverage
       2.2.1.  Network Connection
       2.2.2.  Simulation Setup
       2.2.3.  Expected Behavior
     2.3.  Desired Evaluation Metrics for Cellular Test Cases
   3.  Wi-Fi Networks Specific Test Cases
     3.1.  Bottleneck in Wired Network
       3.1.1.  Network Topology
       3.1.2.  Test/Simulation Setup
       3.1.3.  Typical Test Scenarios
       3.1.4.  Expected Behavior
     3.2.  Bottleneck in Wi-Fi Network
       3.2.1.  Network Topology
       3.2.2.  Test/Simulation Setup
       3.2.3.  Typical Test Scenarios
       3.2.4.  Expected Behavior
     3.3.  Other Potential Test Cases
       3.3.1.  EDCA/WMM usage
       3.3.2.  Effect of Heterogeneous Link Rates
   4.  IANA Considerations
   5.  Security Considerations
   6.  References
     6.1.  Normative References
     6.2.  Informative References
   Contributors
   Acknowledgments
   Authors' Addresses

1.  Introduction

   Wireless networks (both cellular and Wi-Fi [IEEE802.11]) are an
   integral and increasingly more significant part of the Internet.
   Typical application scenarios for interactive multimedia
   communication over wireless include video conferencing calls in a bus
   or train as well as live media streaming at home.  It is well known
   that the characteristics and technical challenges for supporting
   multimedia services over wireless are very different from those of
   providing the same service over a wired network.  Although the basic
   test cases as defined in [RFC8867] have covered many common effects
   of network impairments for evaluating RTP-based congestion control
   schemes, they remain to be tested over characteristics and dynamics
   unique to a given wireless environment.  For example, in cellular
   networks, the base station maintains individual queues per radio
   bearer per user hence it leads to a different nature of interactions
   between traffic flows of different users.  This contrasts with a
   typical wired network setting where traffic flows from all users
   share the same queue at the bottleneck.  Furthermore, user mobility
   patterns in a cellular network differ from those in a Wi-Fi network.
   Therefore, it is important to evaluate the performance of proposed
   candidate RTP-based congestion control solutions over cellular mobile