Internet DRAFT - draft-sfc-sinha-5g-bearer-dc-wifi
draft-sfc-sinha-5g-bearer-dc-wifi
Service Function Chaining Sunil Kumar Sinha
Internet-Draft Infinite Computing Solutions
Intended status: Informational Amardeep Sinha
Expires: December 9, 2018 Reliance Jio Infocomm Limited
Yogesh Chandeshware
Mavenir
Devendra Kumar Singh
Ericsson
June 10, 2018
5G System Split Bearer in Dual Connectivity of WiFi
draft-sfc-sinha-5g-bearer-dc-wifi-00
Abstract
This document attempts the case for new work that needs to be
developed for 5G users to improve faster download and upload of
user's data in a scenario of dual-connectivity for non-3GPP access
outlinig the poor wifi coverage issues. This document also outlines
the faster user data mechanism accompanying non-3GPP access of 5G
user device via split bearer in case of a poor coverage.
Status of This Memo
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This Internet-Draft will expire on December 9, 2018
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Table of Contents:
1. Introduction................................................2
2. Conventions and Terminology.................................2
3. User data flow for Dual Connectivity for non-3GPP Access and
problem statement...........................................2
3.1 5G System Architecture..................................2
3.2 QoS.....................................................3
3.3 Dual Connectivity.......................................3
3.4 Problem Statement.......................................3
4. Proposal for Split Bearer in Dual-Connectivity of
Non-3GPP access.............................................4
5. IANA Considerations.........................................5
6. Security Considerations.....................................5
7. Privacy Considerations .....................................5
8. Acknowledgements............................................5
9. References1.................................................5
9.1. Normative References...................................6
9.2. Informative References.................................6
Authors' Addresses.............................................7
1. Introduction
5G System has been evolved to serve user in more efficient way of
meeting higher download and upload of user data, 5G Users accessing
the network via wireline and wireless, in addition to Residential
Gateway RG and IoT support.In 5G System, access and user experience
are a challenging for poor radio coverage for both wi-fi and RAN.
The proposal in this document address to the problem of non-3GPP
access only when having poor coverage.
2. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [1].
3. User data flow for Dual Connectivity for non-3GPP Access and problem
statement
3.1 5G System Architecture
5G System supporting UE access to the network function and services
via non-3GPP is shown in Figure-1. An example of such access is
like WLAN or Wi-Fi. The N3IWF interface connect UE with 5G core
network via N2 and N3 interface.
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+-------------------------------+
| |
| +------------------+ |
| | |N8 |N15
| | | |
+------+ | | +------+ N13 +-----+ |
| NSSF |---+ | | | AUSF |-------| UDM | |
+------+ | | | +------+ +-----+ |
| | | | | |
| | | | | |
N22| | | |N12 |N10 +-----+ N5 +----+
| | | +---+ | | PCF |------| AF |
| | | | | +-----+ +----+
| | | | | |
+--------+ +-------+ +-----+ |
UE---|AP|N3IWF|-----| AMF |------------| SMF |-------+
+--------+ N2 +-------+ N11 +-----+ N7
| |
|N3 |N4
| |
| +-----+ N6 +-------------+
+------------------------------| UPF |--------| Service N/W |
+-----+ +-------------+
Figure 1 : Simplified 5G System Architecture for Wi-Fi access
3.2 QoS
QFI is defined as QoS Flow ID is a identity to QoS flow in the 5G
System. All data traffic within a PDU session are each labelled or
identified by QFI, implies same QFI labelled data flow will receive
same traffic forwarding treatment like scheduling, priority, etc.
Data flow is via N3 (and N3 and N9) interface, being encapsulated
end-to-end. This flow is controlled by SMF, who provides QoS profile
during session establishment to R(AN) and provide the PDR to the UPF.
Please Note that like 4G System, default QoS flow is applied to each
PDU session and retain till lifetime span of connectivity. In case
of non-3GPP access QFI is delivered to N3IWF entity (or NG-RAN) for
every time User Plane of the PDU session is established, modified or
activated.
3.3 Dual Connectivity
Dual connectivity (DC) concept developed for 3GPP access,
functionality support the network to make use of additional radio
resource to achieve required throughput in downlink and uplink of
user data. Same concept has been introduced in this document for
non-3GPP access via Access-Point acting as master-AP and
Secondary-AP.
3.4 Problem Statement
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Problem statement 1: 5G user accessing network over wifi connection
often have non-coverage issue resulting in poor user experience
Proposal made in this document to make user of wifi access nearest
to user and delivering the user data without affecting user
experience.
4. Proposal for Split Bearer in Dual-Connectivity in Non-3GPP access
Referring to document [20160157293 A1], the solution proposed in this
document to solve the degrade wifi radio resource connected to UE.
N3IWF /WLC acting as a Wi-Fi aggregation point will deliver user-data
via more than one AP (Access Point).
As shown in figure 2 below,in case of wifi dual connectivity (DC),
different from 3GPP standard, N3IWF have full control to on the
deliver of user data by splitting it into multiple Access Points.
'Wifi Aggregation' functionality of WLC. 5G user being served by
multiple Access Points and each of these Access Points has
independent connectivity with N3IWF, which is different from DC
functionality of 3GPP.
Master-AP
+-----+
| AP1 |-----+
+-----+ |
| |
|Y1 |Y2
+-----+ |
| |
| +-----+ N2 +-----+ N11 +-----+
UE |N3IWF|------| AMF |-------| SMF |
| +-----+ +-----+ +-----+
| | | |
+-----+ | | |
| | | |
|Y1 Y2| | |
| | |N3 |N4
+-----+ | | |
| AP2 |-----+ | |
+-----+ | |
Secondary-AP | |
| +-----+ N6 +-------------+
+---------------------| UPF |------| Service N/W |
+-----+ +-------------+
Figure 2: Bearer split in Dual-Connectivity in Non-3GPP access
N3IWF have enhanced aggregation feature of governing single user
data on multiple Access Points. That is N3IWF control user data
delivery via two Access Points namely Master-AP and Secondary-AP.
Based on Wi-Fi radio resource condition, N3IWF SHOULD take decision
to split user data delivery via multiple Access-Points.
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N3IWF MUST also completely switch all the user data to Secondary-AP
and releasing them from Master-AP. Thereafter Secondary-AP will be
referred as Master-AP.
5. IANA Considerations
None.
6. Security Considerations
Security considerations related to the 5G Systems are discussed in
[NGMN]. Due to the request for intrinsic realization of security
such aspects have to be considered by design for architecture and
protocols.
Especially as a joint usage of resources and network functions by
different separate logical network slices (e.g. in terms of virtual
network functions) seems to be inevitable in the framework of 5G the
need for strong security measures in such an environment is a major
challenge.
7. Privacy Considerations
Support of full privacy of the users (customers and tenants / end
service providers) is a basic feature of the next generation trusted
and reliable communications offering system. Such a high degree of
ensured privacy shall be reflected in the proposed architecture and
protocol solutions.
Especially as Identifiers and mapping of locators to them are
addressed some privacy concerns arise. Mobility solutions tend to
expose unique identifiers. A solution inside the mobile network
exposes these identifiers to the network operator, which is not a big
deal since the network operator already has information about the
device's location. In contrast, an IP level solution exposes both
the identifiers and the locations at the IP layer. That means that
web sites, for example, can now track the device's successive
locations by watching the IP address. Solutions such as transporting
the identifiers not as part of the IP header should be considered.
8. Acknowledgements
This work has been partially performed in the framework of the
cooperation Config. Contributions of the project partners are
gratefully acknowledged. The project consortium is not liable for
any use that may be made of any of the information contained therein.
Comments, constructive critisms from Karthik Palaniswamy and
Nagesh V. J. are respectfully acknowledged.
9. References
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9.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
9.2. Informative References
[TS23.501]
"3GPP TS23.501, System Architecture for the 5G System
(Release 15)", March 2018.
[TS36.300]
"3GPP TS36.300, Evolved Universal Terrestrial Radio Access
(E-UTRA) and Evolved Universal Terrestrial Radio Access
Network (E-UTRAN); Overall description", March 2018.
[20160157293 A1]
"Method to Provide Dual Connectivity Using LTE Master
eNodeB and Wi-Fi Based Secondary eNodeB", June,2016.
[TS23.502]
"3Procedures for the 5G System", March 2018.
[TS23.228]
"IP Multimedia Subsystem (IMS)", March 2018.
[TR38.801]
"Study on new radio access technology: Radio
access architecture and interfaces", March 2017.
[TR23.793]
"Study on Access Traffic Steering, Switch and Splitting
support in the 5G system architecture.", April 2018.
[TR23.793]
"Study on Access Traffic Steering, Switch and Splitting
support in the 5G system architecture.", April 2018.
[ETSI GR NGP 004]
"Next Generation Protocol (NGP):Evolved Architecture for
mobility using. Identity Oriented Networks.",January 2018
[ETSI GR NGP 001]
"Next Generation Protocol (NGP); Scenario Definitions".
,May 2017
[NGMN] NGMN Alliance, "NGMN White Paper", February 2015.
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Authors' Addresses
Sunil Kumar Sinha
FF-01, Rainbow Residency,
Green Glan layout,
Bellandur, Bangalore
Karnataka,
India
Email: sunilkumarsinha9@gmail.com
Amardeep Sinha
C-1003, Yashodeep Heights,
Sec-29C, Airoli,
Navi-Mumbai, Maharashtra,
India
Email: sinha.amardeep@gmail.com
Yogesh Chandeshware
Shasi Nivas, 1st Street , F main,
Vijaya Vank Colony Extn,
Banaswadi, Bangalore
Karnataka,
India
Email: yogeshjc017@gmail.com
Devendra Kumar Singh
C-411, Dodabakundi , Outer Ring Road,
Near Alpine Eco Apartment,
Ferns City,
Chinnapalya, Bengaluru,
India
Email: dev.singh.raj@gmail.com
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