applying ipv6 to lte networks
TRANSCRIPT
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Applying IPv6 to LTE Net-work
2015.9.8
Deoknyong Ko ([email protected])New Connectivity TF
Network Technology R&D CenterSKtelecom
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What’s the first thingsthat pops into your mindwhen you hear the word, Korea?
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What’s the first thingsthat pops into your mindwhen you hear the word, Korea?
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Which country invented the Internet for the first time in the world ?
Which country was next ?
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Which country invented the Mobile IPv6 Internet for the first time in the world ?
Which country was next ?
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What’s the first thingsthat pops into your mindwhen you hear the word, Korea?
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※ The Market Share of Mo-bile Subscribers in Korea
SKtelecom 50.5%KT
LG U+
Wired Broadband Mobile Platform Semiconductor
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Background
IPv6 Transition Schemes
Contents
FAQ
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Background
IPv6 Transition Schemes
Contents
FAQ
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Korean Status in The Past
France
United States
Japan
Germany
Romania
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Korean Government’s Encour-age
Sub-ject Company Networks Date
Operator
SKtelecom On Commercial '14.9.25SKbroadband On Field Trial ’12.5.29
KT PreparingLGU+ On Commercial
(Only Voice)
PortalNaver PreparingDaum On Commercial '14.9.25Nate Preparing
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Summary of Applying IPv6Sub-
ject Purpose NetworksTransi-
tion Scheme
Date Sub-scribers
Wired Field Trial HFC, G-PON Dual Stack
’12.5.29
1 thou-sand
Wireless Commercial LTE Only IPv6 '14.9.25 670 thou-sands
IPv4 Networks
Dual Stack(IPv4/IPv6)
Only IPv6Networks
IPv4 Networks
※ Subscribers by Jan. 2015
Only IPv6Networks
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Why Did SKT Decide toAdopt IPv6 ?
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Why Did SKT Decide toAdopt IPv6 ?
CapEx for NAT equipment
※ Reference: http://www.google.com/intl/en/IPv6/index.html
∙ LTE device has 2 different IPv4 addresses by default in SKT.∙ The number of connected device could exponentially increase.
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Difficult to operate duplicated networks
Why Did SKT Decide toAdopt IPv6 ?
NetworkA
NetworkB
NetworkA
NetworkB
PDN-GW#1
PublicNetwork
PDN-GW#2
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Korean government’s encourage-ment
Why Did SKT Decide toAdopt IPv6 ?
※ The statistics of IPv6 users. (http://6lab.cisco.com/stats)
United States
Norway
GermanyBelgium
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Which Networks to be migrated IPv6?
Applying IPv6 to only primary networks.Legacy network will be replaced to LTE or G-PON.Sub-
ject Net-
works Applying IPv6 Note
WirelessLTE O Commercial
WCDMA XWi-Fi X
WiredG-PON O Field TrialHFC X
xDLS X
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Contents
Background
IPv6 Transition Schemes
FAQ
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Summary of IPv6 Transition Schemes
Subject Transition Schemes
Backbone Dual StackAccess Networks
(LTE EPC) NAT64, 464XLAT
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Transition Scheme for Backbone
Dual stack can support both IPv4 and IPv6 access networks.
There is no issue.
We don’t even need to apply Only-IPv6 to the backbone.
Dual Stack(Backbone)
IPv4 Access Networks
(WCDMA, Wi-Fi)
IPv6Access Network
(LTE)
PublicNetwork
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Case#1: IPv6 is enabled on contents server (End-to-End IPv6 connectivity)
Transition Scheme for Access Network
Case#2: IPv6 is not enabled on contents servers
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PDN-GW
Dual StackNetwork
LTE Device(Only IPv6)
Dual Stack
Only IPv6
Case#1: IPv6 is enabled on contents server (End-to-End IPv6 connectivity)
Transition Scheme for Access Network (contd)
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Transition Scheme for Access Network (contd)
Case#2: IPv6 is not enabled on contents servers
PDN-GW
PublicNetwork
NAT64
DNS64
LTE Device(Only IPv6)
Only IPv4
Only IPv4
SKT should support that only-IPv6 subscribers can connect to
only-IPv4 contents server.NAT64, DNS64
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Algorithm of NAT64, DNS64
PDN-GW
PublicNetwork
NAT64
DNS64
LTE Device(IPv6-Only)
IPv4-Only
IPv4-Only
① Customer tries to connect to www.naver.com② LTE device asks DNS64 server what is an IP address of www.naver.com③ DNS64 server responds ‘64:ff9b::www.naver.com’④ LTE device tries to connect to ‘64:ff9b::www.naver.com’⑤ NAT64 translate IPv6 packet to IPv4 packet
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Drawback of NAT64 AlgorithmSome applications are Hard Coded as only IPv4 address instead of domain name. ∙ IPv6 LTE device doesn’t ask DNS64 server.
∙ Only IPv6 LTE device can’t interpret an IPv4 address.
Error occurred !!
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464XLAT OverviewRFC 6877, “464XLAT: Combination of state-ful and stateless translation” (Information Track)Provided by Android OS by default
T-Mobile USA and SKT adopted
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464XLAT Architecture464XLAT has two operations, CLAT and PLAT
Sub-ject CLAT PLAT
Full Name Customer-side transla-tor
Provider-side transla-tor
Location In cellphone In operator’s networkTransla-
tion IPv4 IPv6 IPv6 IPv4
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464XLAT Operation
Subject Inter-face Source Address
Data Packet
LTE DataOriginal Allocated from P-GW (e.g. 2001:290::1)
CLAT“192.0.0.4” (dummy IPv4 address)
“LTE data interface ::464” (e.g. 2001:290::464)
Voice Packet LTE IMS Allocated from P-GW (e.g. 2001:2b8::1)
LTE device has 3 outgoing interfaces
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464XLAT Operation (contd)
If android OS find a hard coded for IPv4 address(1.2.3.4), android OS will transfer packet via CLAT interface.
CLAT PLAT(5.6.7.8)
Content Server
(1.2.3.4)Src: 192.0.0.4Dest: 1.2.3.4
Src: 2001:290::464Dest: 64:ff9b::1.2.3.4
Src: 2001:290::464Dest: 64:ff9b::1.2.3.4
Src: 5.6.7.8Dest: 1.2.3.4
Src: 5.6.7.8Dest: 1.2.3.4
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Verify 464XLAT Schemes
Verified 15 hundreds applications while preparing the commercial service.
A few applications have trouble due to customer’s circumstance.
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Background
IPv6 Transition Schemes
Contents
FAQ
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Which handset OSs and models are supported an IPv6 service?
∙ We applied to only android OS not iOS.∙ We applied to Galaxy Note 4 first. (‘14.9.24)∙ We have applied to all new devices including tablet since then.
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Do you support IMS service(VoLTE) also?
∙ Of course. ∙ We support an IPv6 service of LTE Data and LTE Voice.
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Do you support international roaming service?
∙ Not yet. ∙ We don’t have a plan to launch now.
Do you support Wi-Fi service?
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Do you support tethering ser-vice?∙ Yes.
∙ LTE device allocates an IPv4 ad-dress not IPv6 address to laptop.
LTE Device(IPv6 Address)Laptop
(IPv4 Address)
PublicIPv6 Network
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Do you satisfy the quality of IPv6 data and IMS service compared to IPv4 ?
∙ Yes. ∙ We can’t find the quality differ-ence between IPv4 and IPv6 ser-vice.
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Can I know about the increase of IPv6 users and IP deploy-ment since commercial service ? ∙ I’m sorry but, I can’t inform that.
∙ IPv6 users and the CapEx for IP de-ployment are restricted document.
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Can I know about the increase of IPv6 traffic since commercial service ?
∙ Recent IP equipment(ex> Router, P-GW) can’t distinguish between IPv4 traffic and IPv6 traffic.
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Do you inform your customers that they are serviced by IPv6 ?∙ No.
∙ Our aim is that our customer can’t recognize which service is pro-vided.
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How to utilize the collected Public IPv4 addresses ?
∙ Private IPv4 addresses were used to VoLTE Service. ∙ We are currently allocating Public IPv4 addresses to VoLTE service to raise voice quality.
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Do you have a plan to launch the new BM based on IPv6 ?
∙ Yes. ∙ We are developing the cellular based IoT Service (ex> MTC, NB CIoT).
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