YANG model for NETCONF Event Notifications
draft-ahuang-netconf-notif-yang-05
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| Document | Type | Active Internet-Draft (individual) | |
|---|---|---|---|
| Authors | Alex Huang Feng , Pierre Francois , Thomas Graf , Benoît Claise | ||
| Last updated | 2024-06-18 | ||
| RFC stream | (None) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Yang Validation | 0 errors, 1 warnings | ||
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draft-ahuang-netconf-notif-yang-05
Network Working Group A. Huang Feng
Internet-Draft P. Francois
Updates: RFC5277 RFC8639 RFC7951 RFC9254 (if INSA-Lyon
approved) T. Graf
Intended status: Standards Track Swisscom
Expires: 19 December 2024 B. Claise
Huawei
17 June 2024
YANG model for NETCONF Event Notifications
draft-ahuang-netconf-notif-yang-05
Abstract
This document defines the structure of NETCONF Event Notification in
a YANG model to be used in NETCONF environments. The definition of
this YANG model allows the encoding of NETCONF Event Notifications in
YANG compatible encodings such as JSON and CBOR.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 19 December 2024.
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Copyright Notice
Copyright (c) 2024 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
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Relationship to past documents . . . . . . . . . . . . . . . 3
2.1. Relationship to RFC5277 . . . . . . . . . . . . . . . . . 3
2.2. Relationship to RFC8639 . . . . . . . . . . . . . . . . . 4
2.3. Relationship to RFC7951 . . . . . . . . . . . . . . . . . 4
2.4. Relationship to RFC9254 . . . . . . . . . . . . . . . . . 4
3. Differences to draft-ietf-netconf-notification-messages . . . 4
4. NETCONF Notification structure . . . . . . . . . . . . . . . 5
4.1. XML Structure . . . . . . . . . . . . . . . . . . . . . . 5
4.2. JSON Structure . . . . . . . . . . . . . . . . . . . . . 5
4.3. CBOR Structure . . . . . . . . . . . . . . . . . . . . . 6
5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1. YANG Tree Diagram . . . . . . . . . . . . . . . . . . . . 8
5.2. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 10
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
7.1. URI . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2. YANG module name . . . . . . . . . . . . . . . . . . . . 10
7.3. YANG SID-file . . . . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. .sid file . . . . . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
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1. Introduction
NETCONF Event Notifications [RFC5277] and YANG-Push [RFC8639] allow
NETCONF [RFC6241] servers and YANG-Push publishers to send
notifications to a data collection. The NETCONF client and the YANG-
Push receiver decodes the message and optionally validates the header
and the content before forward it to the next process. This schema
validation process ensures to not break the data processing chain.
The structure of a NETCONF Event notification has been defined in
[RFC5277] using a XML Schema [W3C.REC-xml-20001006] allowing NETCONF
nodes to validate the header schema of the notification message when
it is encoded in XML. However, when these notifications are sent
using YANG-Push [RFC8639][RFC8641], they can be encoded in other
encodings such as JSON [RFC7951] or CBOR [RFC9254]. In such cases,
the model defined in [RFC5277] cannot be used to validate the
notification header.
This document defines the content of the header of such notifications
allowing implementations to validate the schema of the notifications
when they are encoded in other encodings than XML. A YANG 1.1
[RFC7950] model is defined for such purposes.
This document updates [RFC5277], [RFC8639] and [RFC7951] specifying
how a Notification header should be encoded. RESTCONF Notifications
[RFC8040] are out of scope of this document.
2. Relationship to past documents
This section exposes the relationship to [RFC5277], [RFC8639],
[RFC7951] and [RFC9254].
2.1. Relationship to RFC5277
[RFC5277] defines a mechanism for NETCONF nodes to send notifications
to a collector. These are the key relationships between the current
document and [RFC5277]:
* Section 2.1 of [RFC5277] defines how to configure a subscription
to receive NETCONF Event Notifications. The RPCs are defined in
the XML schema in Section 3.4 of [RFC5277]. This document does
not update or add any new RPCs to this schema.
* The notification structure is defined in Section 4 of [RFC5277]
using a XML schema. This document defines the structure of the
notification in XML, JSON and CBOR in Section 4. In XML, the same
structure is used.
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2.2. Relationship to RFC8639
Subscribed Notifications [RFC8639] defines a mechanism on top of
[RFC5277] to stream notifications from the NETCONF node. These are
the key relationships between the current document and [RFC8639]:
* Section 1.4 of [RFC8639] states that the the solution uses the
notification structure defined in [RFC5277]. This document
replaces this structure using a YANG module allowing JSON and CBOR
encodings.
2.3. Relationship to RFC7951
[RFC7951] defines how YANG data is encoded using JSON. These are the
key relationship points between the current document and [RFC7951]:
* [RFC7951] does not define explicitely how a YANG notification
should be encoded using JSON encoding. This document specifies
the structure of such notification for JSON when these are used in
a NETCONF [RFC6241] environment.
2.4. Relationship to RFC9254
[RFC9254] defines how YANG data is encoded using CBOR. These are the
key relationship points between the current document and [RFC9254]:
* [RFC9254] does not define explicitely how a YANG notification
should be encoded using CBOR encoding. [RFC9254] states that
Notifications are container-like instances which does not follow
how notifications are encoded in XML and JSON encodings. This
document replaces this statement and ensures consistency between
the different notification structures in YANG. This structure is
to be used within NETCONF [RFC6241] environments.
3. Differences to draft-ietf-netconf-notification-messages
Note to the RFC-Editor: Please remove this section before publishing.
[I-D.ietf-netconf-notification-messages] proposes a structure to send
multiple notifications in a single message. Unlike
[I-D.ietf-netconf-notification-messages], this document defines a
YANG module to encode NETCONF Notifications with encodings other than
XML, which is currently not existing. The structure for NETCONF
notifications is defined in [RFC5277] using a XSD, but there is no
YANG module defining the structure of the notification message sent
by a server when the message is encoded in JSON [RFC7951] or CBOR
[RFC9254].
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4. NETCONF Notification structure
This section defines how NETCONF YANG Notifications are structured in
XML, JSON and CBOR encodings. The same namespace "ietf-notification"
is used to be compliant with [RFC5277].
4.1. XML Structure
The same structure as defined in Section 4 of [RFC5277] is used. The
structure uses the XML namespace that has been defined in [RFC5277]:
urn:ietf:params:xml:ns:netconf:notification:1.0
Two child nodes within the "notification" container are expected,
representing the event time and the notification payload. The
"eventTime" node is defined within the same XML namespace as the
"notification" element and is compliant with [RFC3339].
The name and namespace of the payload element are determined by the
YANG module containing the notification statement representing the
notification message.
The following example shows a "push-update" notification defined in
the YANG module of YANG-Push [RFC8641] encoded in XML:
<notification xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">
<eventTime>2022-09-02T10:59:55.32Z</eventTime>
<push-update xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-push">
<id>1011</id>
<datastore-contents>
<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
<interface>
<name>eth0</name>
<oper-status>up</oper-status>
</interface>
</interfaces>
</datastore-contents>
</push-update>
</notification>
Figure 1: XML-encoded notification
4.2. JSON Structure
A YANG notification encoded in JSON is structured as a root
"notification" container. The namespace of this container is the
name of the YANG module "ietf-notification" defined in Section 5.
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Two child nodes within the "ietf-notification:notification" container
are expected, representing the event time and the notification
payload. The "eventTime" node is defined within the same namespace
as the "ietf-notification:notification" container and is compliant
with [RFC3339].
The following example shows a "push-update" notification defined in
the YANG module of YANG-Push [RFC8641] encoded in JSON:
{
"ietf-notification:notification": {
"eventTime": "2023-02-10T08:00:11.22Z",
"ietf-yang-push:push-update": {
"id": 1011,
"datastore-contents": {
"ietf-interfaces:interfaces": [
{
"interface": {
"name": "eth0",
"oper-status": "up"
}
}
]
}
}
}
}
Figure 2: JSON-encoded notification
When Notifications are implemented within RESTCONF [RFC8040]
environments, the namespace of a notification stays "ietf-
restconf:notification" as defined in Section 6.4 of [RFC8040].
4.3. CBOR Structure
YANG data can be represented in CBOR using Names or SIDs in keys.
The following sections shows how these messages are encoded in both
cases.
4.3.1. CBOR encoded messages
Notifications encoded using keys is similar to JSON encoding as
defined in Section 3.3 of [RFC9254]. The key of the element can be
the element itself or be namespace-qualified. In the latter case,
the namespace of the notification container uses the YANG module name
"ietf-notification" defined in Section 5.
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Two child nodes within the "ietf-notification:notification" container
are expected, representing the event time and the notification
payload. The "eventTime" node is defined within the same namespace
as the "ietf-notification:notification" container and is compliant
with [RFC3339].
The following example shows a "push-update" notification defined in
the YANG module of YANG-Push [RFC8641] encoded in CBOR using names as
keys. The example uses the CBOR diagnostic notation as defined in
section 3.1 of [RFC9254]:
{
"ietf-notification:notification": {
"eventTime": "2023-02-10T08:00:11.22Z",
"ietf-yang-push:push-update": {
"id": 1011,
"datastore-contents": {
"ietf-interfaces:interfaces": [
{
"interface": {
"name": "eth0",
"oper-status": "up"
}
}
]
}
}
}
}
Figure 3: CBOR-encoded notification using diagnostic notation
4.3.2. CBOR encoded messages using YANG-SIDs
A Notification encoded using YANG-SIDs replaces the names of the keys
of the CBOR encoded message for a 63 bit unsigned integer. This is
defined in Section 3.2 of [RFC9254] and a process for SID allocation
is defined in [I-D.ietf-core-sid].
Two child nodes within the root container are expected, representing
the event time and the notification payload. The root container and
the "eventTime" node uses a SID and the content of the "eventTime" is
compliant with [RFC3339].
This is an example of YANG-CBOR encoded notification using YANG SIDs
[RFC9254]. The Figure 4 shows the message using the CBOR diagnostic
notation as defined in section 3.1 of [RFC9254]:
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{
2551: {
1: "2023-02-10T08:00:11.22Z",
"ietf-yang-push:push-update": {
"id": 1011,
"datastore-contents": {
"ietf-interfaces:interfaces": [
{
"interface": {
"name": "eth0",
"oper-status": "up"
}
}
]
}
}
}
}
Figure 4: CBOR-encoded notification using YANG SIDs in CBOR
diagnostic notation
5. YANG Module
5.1. YANG Tree Diagram
This YANG module adds a structure with one leaf for the datetime as
defined in section 2.2.1 of [RFC5277]. The name of the leaf matches
the definition of the XSD element name defined in Section 4 of
[RFC5277].
module: ietf-notification
structure notification:
+-- eventTime yang:date-and-time
5.2. YANG Module
The YANG module uses the same namespace from the XML Schema defined
in Section 4 of [RFC5277] allowing to use this YANG module to also
validate already implemented XML encoded NETCONF Event Notifications.
<CODE BEGINS> file "ietf-notification@2024-06-17.yang"
module ietf-notification {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:netconf:notification:1.0";
prefix inotif;
import ietf-yang-types {
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prefix yang;
reference
"RFC 6991: Common YANG Data Types";
}
import ietf-yang-structure-ext {
prefix sx;
reference
"RFC 8791: YANG Data Structure Extensions";
}
organization "IETF NETCONF (Network Configuration) Working Group";
contact
"WG Web: <https://datatracker.ietf.org/group/netconf/>
WG List: <mailto:netconf@ietf.org>
Authors: Alex Huang Feng
<mailto:alex.huang-feng@insa-lyon.fr>
Pierre Francois
<mailto:pierre.francois@insa-lyon.fr>
Thomas Graf
<mailto:thomas.graf@swisscom.com>
Benoit Claise
<mailto:benoit.claise@huawei.com>";
description
"Defines NETCONF Event Notification structure as defined in
RFC5277 and RFC7950. This YANG module uses the same namespace
from the XML schema defined in Section 4 of RFC5277 to be able to
validate already implemented XML encoded messages.
This module can be used to validate XML encoded notifications
[RFC7950], JSON encoded messages [RFC7951] and CBOR encoded
messages [RFC9254]. Refer to Section 4 of RFC XXXX for more
details.
Copyright (c) 2024 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.";
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revision 2024-06-17 {
description
"First revision";
reference
"RFC XXXX: NETCONF Event Notification YANG";
}
sx:structure notification {
leaf eventTime {
type yang:date-and-time;
mandatory true;
description
"The date and time the event was generated by the event
source. This parameter is of type dateTime and compliant
to [RFC3339]. Implementations must support time zones.
The leaf name in camel case matches the name of the XSD
element defined in Section 4 of RFC5277.";
}
}
}
<CODE ENDS>
6. Security Considerations
The security considerations for the NETCONF Event notifications are
described in [RFC5277]. This documents adds no additional security
considerations.
7. IANA Considerations
This document describes the URI used for the IETF XML Registry and
registers a new YANG module name.
7.1. URI
IANA is requested to add this document as a reference in the
following URI in the IETF XML Registry [RFC3688].
URI: urn:ietf:params:xml:ns:netconf:notification:1.0
Registrant Contact: The IESG.
XML: N/A; the requested URI is an XML namespace.
Reference: RFC5277; RFC-to-be
7.2. YANG module name
This document registers the following YANG module in the YANG Module
Names Registry [RFC6020], within the "YANG Parameters" registry:
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name: ietf-notification
namespace: urn:ietf:params:xml:ns:netconf:notification:1.0
prefix: inotif
reference: RFC-to-be
7.3. YANG SID-file
IANA is requested to register a new ".sid" file in the "IETF YANG SID
Registry" [I-D.ietf-core-sid]:
SID range entry point: TBD
SID range size: 50
YANG module name: ietf-notification
reference: RFC-to-be
A ".sid" file is proposed in Appendix A.
8. Acknowledgements
The authors would like to thank Per Anderson, Andy Bierman, Carsten
Bormann, Mohamed Boucadair, Tom Petch, Jason Sterne, Kent Watsen and
Rob Wilton for their review and valuable comments.
9. References
9.1. Normative References
[I-D.ietf-core-sid]
Veillette, M., Pelov, A., Petrov, I., Bormann, C., and M.
Richardson, "YANG Schema Item iDentifier (YANG SID)", Work
in Progress, Internet-Draft, draft-ietf-core-sid-24, 22
December 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-core-sid-24>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3339] Klyne, G. and C. Newman, "Date and Time on the Internet:
Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002,
<https://www.rfc-editor.org/info/rfc3339>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
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[RFC5277] Chisholm, S. and H. Trevino, "NETCONF Event
Notifications", RFC 5277, DOI 10.17487/RFC5277, July 2008,
<https://www.rfc-editor.org/info/rfc5277>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<https://www.rfc-editor.org/info/rfc6241>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG",
RFC 7951, DOI 10.17487/RFC7951, August 2016,
<https://www.rfc-editor.org/info/rfc7951>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8639] Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard,
E., and A. Tripathy, "Subscription to YANG Notifications",
RFC 8639, DOI 10.17487/RFC8639, September 2019,
<https://www.rfc-editor.org/info/rfc8639>.
[RFC8641] Clemm, A. and E. Voit, "Subscription to YANG Notifications
for Datastore Updates", RFC 8641, DOI 10.17487/RFC8641,
September 2019, <https://www.rfc-editor.org/info/rfc8641>.
[RFC8791] Bierman, A., Björklund, M., and K. Watsen, "YANG Data
Structure Extensions", RFC 8791, DOI 10.17487/RFC8791,
June 2020, <https://www.rfc-editor.org/info/rfc8791>.
[RFC9254] Veillette, M., Ed., Petrov, I., Ed., Pelov, A., Bormann,
C., and M. Richardson, "Encoding of Data Modeled with YANG
in the Concise Binary Object Representation (CBOR)",
RFC 9254, DOI 10.17487/RFC9254, July 2022,
<https://www.rfc-editor.org/info/rfc9254>.
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[W3C.REC-xml-20001006]
Bray, T., Paoli, J., Sperberg-McQueen, M., and E. Maler,
"Extensible Markup Language (XML) 1.0 (Second Edition)",
W3C, October 2000,
<https://www.w3.org/TR/2000/REC-xml-20001006>.
9.2. Informative References
[I-D.ietf-netconf-notification-messages]
Voit, E., Jenkins, T., Birkholz, H., Bierman, A., and A.
Clemm, "Notification Message Headers and Bundles", Work in
Progress, Internet-Draft, draft-ietf-netconf-notification-
messages-08, 17 November 2019,
<https://datatracker.ietf.org/doc/html/draft-ietf-netconf-
notification-messages-08>.
[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<https://www.rfc-editor.org/info/rfc8040>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
Appendix A. .sid file
Note to the RFC-Editor: Please remove this section before publishing.
For CBOR encoding using YANG-SIDs identifiers, a ".sid" file is
requested to IANA in Section 7.3.
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<CODE BEGINS> file "ietf-notification@2024-05-27.sid"
{
"ietf-sid-file:sid-file": {
"module-name": "ietf-notification",
"module-revision": "2024-05-27",
"description": "NETCONF Event Notification structure",
"dependency-revision": [
{
"module-name": "ietf-yang-types",
"module-revision": "2013-07-15"
},
{
"module-name": "ietf-yang-structure-ext",
"module-revision": "2020-06-17"
}
],
"assignment-range": [
{
"entry-point": "2550",
"size": "50"
}
],
"item": [
{
"namespace": "module",
"identifier": "ietf-notification",
"sid": "2550"
},
{
"namespace": "data",
"identifier": "/ietf-notification:notification",
"sid": "2551"
},
{
"namespace": "data",
"identifier": "/ietf-notification:notification/eventTime",
"sid": "2552"
}
]
}
}
<CODE ENDS>
Figure 5: .sid file for "ietf-notification" module
Authors' Addresses
Huang Feng, et al. Expires 19 December 2024 [Page 14]
Internet-Draft NETCONF Event Notification YANG June 2024
Alex Huang Feng
INSA-Lyon
Lyon
France
Email: alex.huang-feng@insa-lyon.fr
Pierre Francois
INSA-Lyon
Lyon
France
Email: pierre.francois@insa-lyon.fr
Thomas Graf
Swisscom
Binzring 17
CH-8045 Zurich
Switzerland
Email: thomas.graf@swisscom.com
Benoit Claise
Huawei
Email: benoit.claise@huawei.com
Huang Feng, et al. Expires 19 December 2024 [Page 15]