Re: [alto] Cellular information exposure discussion (Fwd: New Version Notification for draft-huang-alto-mowie-for-network-aware-app-04.txt

[[e-mail]]

Hi Richard,

Thanks for this information.

Just out of curiosity, are the proposed extensions currently discussed in the 3GPP?

Cheers,
Med

De : alto <[e-mail]> De la part de Y. Richard Yang
Envoyé : mardi 19 juillet 2022 20:14
À : IETF ALTO <[e-mail]>
Objet : [alto] Cellular information exposure discussion (Fwd: New Version Notification for draft-huang-alto-mowie-for-network-aware-app-04.txt


Hi ALTO WG,

During the weekly meeting today, the design team discussed about the document, and suggested that the authors update the WG on a new version of the MOWIE draft, which was uploaded last week and focuses on cellular network information exposure to network-aware applications. The links to the new version and the diff showing the updates can be found below. Any comments, feedback, or interests in working together are welcome and greatly appreciated.

Using this email, we also want to include that there are two quite relevant pieces of work:
W1. PBE-CC: Congestion Control via Endpoint-Centric, Physical-Layer Bandwidth Measurements (https://arxiv.org/abs/2002.03475), by Yaxiong Xie, Prof. Jamieson, and Prof. Rexford;
W2. Achieving Consistent Low Latency for Wireless Real-Time Communications with the Shortest Control Loop (paper to be made public soon), by Zili, and Prof. Mingwei and team.

It helps to use this email to point out a bigger picture of the problem space and related work. One perspective is that the problem space consists of 3 components:
C1. What cellular-network information should be collected to be sent to the applications?
C2. How is the cellular information sent to the applications?
C3. How do the applications use the information?

It is important to note that the full exploration of the problem space is not included in the current charter. However, this is an important problem space and hence it helps  to keep track of the progress and potential impacts on ALTO.

For C1, the impact will be the list of performance metrics. For C3, the current ALTO charter does not include items to define application behaviors, but it can be a point of discussion related to deployment.

The most relevant component is C2. We discussed the following design points for C2:
D-broadcast: network broadcasts its state
D-pass-bounce: network marks its state on pass-through packets and the receiver bounces the state back to the sender
D-direct-send: network sends its state to app directly
Here by state it can be transformed state.

Current ALTO is designed as D-direct-send. Due to lacking of deployment of D-direct-send in cellular network, aforementioned W1 uses D-broadcast; the D-pass-bounce design need at least a round trip time and couples network feedback flow with data flow, leading to the aforementioned W2 work.

Many of us feel that the time is ready for introducing a highly efficient, flexible channel for network state exposure to applications, led by IETF, and the ALTO team can be a good starting point. As a first step, a systematic evaluation, which (1) surveys the design space and (2) introduces the use cases/benchmarking scenarios, can be a good starting point.

If there is time available in the coming 114 meeting, we can discuss more during the presentation. Otherwise, on-list discussion is a good starting point. We will follow up with more analysis on the list soon but use this email to get the conversation started.

Thanks,

Richard on behalf of Tuesday meeting team



---------- Forwarded message ---------
From: <[e-mail]<mailto:[e-mail]>>
Date: Mon, Jul 11, 2022 at 2:14 PM
Subject: New Version Notification for draft-huang-alto-mowie-for-network-aware-app-04.txt
To: Y. Richard Yang <[e-mail]<mailto:[e-mail]>>, Gang Li <[e-mail]<mailto:[e-mail]>>, Sabine Randriamasy <[e-mail]<mailto:[e-mail]>>, Yixue Lei <[e-mail]<mailto:[e-mail]>>, Yuhang Jia <[e-mail]<mailto:[e-mail]>>, Yunbo Han <[e-mail]<mailto:[e-mail]>>, Yunfei Zhang <[e-mail]<mailto:[e-mail]>>



A new version of I-D, draft-huang-alto-mowie-for-network-aware-app-04.txt
has been successfully submitted by Y. Richard Yang and posted to the
IETF repository.

Name:           draft-huang-alto-mowie-for-network-aware-app
Revision:       04
Title:          MoWIE for Network Aware Applications
Document date:  2022-07-11
Group:          Individual Submission
Pages:          25
URL:            https://www.ietf.org/archive/id/draft-huang-alto-mowie-for-network-aware-app-04.txt
Status:         https://datatracker.ietf.org/doc/draft-huang-alto-mowie-for-network-aware-app/
Htmlized:       https://datatracker.ietf.org/doc/html/draft-huang-alto-mowie-for-network-aware-app
Diff:           https://www.ietf.org/rfcdiff?url2=draft-huang-alto-mowie-for-network-aware-app-04

Abstract:
   With the quick deployment of 5G networks in the world, cloud-based
   interactive applications (services) such as cloud gaming have gained
   substantial attention and are regarded as potential killer
   applications.  To ensure users' quality of experience (QoE), a cloud
   interactive service may require not only high bandwidth (e.g., high-
   resolution media transmission) but also low delay (e.g., low latency
   and low lagging).  However, the bandwidth and delay experienced by a
   mobile and wireless user can be dynamic, as a function of many
   factors, and unhandled changes can substantially compromise the
   user's QoE.  In this document, we investigate network-aware
   applications (NAA), which realize cloud based interactive services
   with improved QoE, by efficient utilization of a solution named
   Mobile and Wireless Information Exposure (MoWIE).  In particular,
   this document demonstrates, through realistic evaluations, that
   mobile network information such as MCS (Modulation and Coding Scheme)
   can effectively expose the dynamicity of the underlying network and
   can be made available to applications through MoWIE; using such
   information, the applications can then adapt key control knobs such
   as media codec scheme, encapsulation, and application layer
   processing to minimize QoE deduction.  Based on the evaluations, we
   discuss how the MoWIE features can define extensions of the ALTO
   protocol, to expose more lower-layer and finer grain network
   dynamics.




The IETF Secretariat


--
Richard
--
Richard

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