Re: [Apn] [DMM] Regarding APN Usecase in Mobile Core

Hi Xuesong and all,

    In my understanding, 5GC can establish multiple GTP-u sessions for different services with different requirements, and the requirements should be satisfied E2E. 

    In the backhaul network, the transport network (such as the IPRAN) should be able to provide proper SLA for different GTP-u sessions.

    APN should be able to benefit the SLA negotiation between the 5G system and the underneath transport network.

Best Regards
Zongpeng Du

duzongpeng@foxmail.com & duzongpeng@chinamobile.com

From: Gengxuesong (Geng Xuesong)
Date: 2021-01-21 10:23
To: Uma Chunduri; Lizhenbin
CC: apn@ietf.org; dmm
Subject: Re: [Apn] [DMM] Regarding APN Usecase in Mobile Core
Hi Uma and all,

I have read the document and got a few questions:
In my understanding, in the UPF where traffic policy is enforced, the fine-granularity services are provided. Then what fields in the GTP-u encapsulation indicates the traffic's service requirements? When a GTP-u tunnel goes into a SRv6 policy, according to which fields in the GTP-u encapsulation the DSCP is generated? We know that there are parameters such as 5QI/QCI and QFI, whether they are associated with a GTP-u tunnel?

Best
Xuesong
From: Apn [mailto:apn-bounces@ietf.org] On Behalf Of Uma Chunduri
Sent: Tuesday, January 19, 2021 3:17 AM
To: Lizhenbin <lizhenbin@huawei.com>
Cc: apn@ietf.org; dmm <dmm@ietf.org>
Subject: Re: [Apn] [DMM] Regarding APN Usecase in Mobile Core

Hi Robin,

In-line..

Cheers!
--
Uma C.

On Mon, Jan 18, 2021 at 5:25 AM Lizhenbin <lizhenbin@huawei.com> wrote:
Hi APNers and DMMers,
I remember that in the mobile core scenarios the GTP-u tunnel can be set up according to the user and application requirements, but I do not understand the details. 

[Uma]: Obviously, the best reference for GTP-U is TS 29.281. However, uou should look into https://datatracker.ietf.org/doc/draft-ietf-dmm-5g-uplane-analysis/ where lot more details and other references related this topic was analyzed (primarily started after/during REL-15, when  any other use plane other than GTP-U is worthwhile is debated for 5G N9 interface).

I think when the packet tunneled by GTP-u traverses the APN-based transport network, it may be mapped to the corresponding tunnel according to the user and application requirements to implement the uniform service. If you are familiar with the principle of GTP-u in the mobile core, please help provide some details. 

Best Regards,
Zhenbin (Robin)

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