IPv6 in 2G and 3G Networks. John Loughney. North American IPv6 Forum 2004

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1 IPv6 in 2G and 3G Networks John Loughney North American IPv6 Forum 2004

2 Introduction Relevant IPv6 Status in the IETF Relevant IPv6 Status in 3GPP Relevant IPv6 Status in 3GPP2 Conclusion

3 What IPv6 Brings Resolves the address space limitation of IPv4 Enables global peer-to-peer services across different networks What is possible with IPv4 in limited scale, is globally possible with IPv6 Less complexity in network maintenance No private address spaces No NATs (savings both in equipment and maintenance costs) End-to-end security features are easier to deploy with global addresses EN D-TO -EN D PHONE CALL EN D-TO -EN D IP M U LTIM ED IA CO N N ECTIO N 1080::1:1:2:ABBA:CAFE IP v6 1080::AAAA:1:2:3:4

4 IPv6 Products Gaining Momentum Symbian 7.0 supports IPv6. Microsoft WinXP and Windows server 2003 supports IPv6. Linux, HP-UX, AIX, VMS, & Solaris 8 shipping IPv6. Most infrastructure vendors support IPv6 Nokia shipping IPv6 in IPSO 3.3 Cisco announced IPv6 support from IOS 12.2(1)T. Applications Sendmail, Apache Web server and Squid webcache are IPv6 enabled. New breed of applications such as 3Degrees are IPv6 only. For a current list see:

5 Dual Stack Handsets One common misconception is that IPv6 stack, especially dual stack, is heavy on terminals. IPv6 TCP/IP stack size is comparable to IPv4 TCP/IP stack. Dual stack (IPv4 and IPv6) size is NOT multiple times the size of IPV4 stack. Dual stack (v4/v6) is comparable (only about 15% bigger than) IPv4 TCP/IP stack. Direct correspondence between IPv4 socket library and IPv6 socket library porting does not require major changes in applications.

6 Peer-to-peer type of applications. Push-to-Talk SIP based multimedia and VoIP Peer-to-peer games IPsec VPNs Applications Benefiting from IPv6

7 IPv6 in

8 IPv6 in 3GPP Specifications Support for IPv6 (for user traffic) was fully introduced in 3GPP Release 99. IPv6 address allocation mechanism was updated in 2002 to allocate a globally unique (/64) prefix (instead of a single address) for every primary PDP context. IP Multimedia Subsystem (IMS) - multimedia service infrastructure introduced in Release 5 specifies IPv6 as the only IP version in the IMS to avoid IPv4-IPv6 transition and interworking problems.

9 Transition to IPv6 in 3GPP networks 3GPP networks have specific requirements and scenarios for transition. Analyzed in the IETF v6ops Working Group Transition Scenarios for 3GPP Networks - RFC GPP Analysis - draft-ietf-v6ops-3gpp-analysis-10.txt GPRS transition scenarios: 1. Dual Stack UE connecting to IPv4 and IPv6 nodes 2. IPv6 UE connecting to an IPv6 node through an IPv4 network 3. IPv4 UE connecting to an IPv4 node through an IPv6 network 4. IPv6 UE connecting to an IPv4 node 5. IPv4 UE connecting to an IPv6 node IMS transition scenarios: 1. UE connecting to a node in an IPv4 network through IMS 2. Two IPv6 IMS connected via an IPv4 network

10 Client,Private IPv4 address 1 There can be NO NATs betw een the PoC term inaland PoC Server! PoC and NATs The UDP inactivity timer in NAT can cause the public UDP port 6538 to be assigned to a different mobile, if the mobile does not send any data within a certain amount of time, e.g. in 40 seconds PoC Server,Public IPv4 address 3 Client,Private IPv4 address 2 N A T UDP port = 6538 Even though PoC connections use a PoC server in the network, private addresses cause problems similar to other SIP signaling cases. UDP inactivity timers are used with NATs and cause some problems: The mobile would need to send keep-alive packets to every used public UDP socket in about 30 seconds. This generates unnecessary overhead traffic and would be very bad for the battery life. The mobiles could easily use up all of the operators public IPv4-addresses due to the refreshments, the public UDP ports can t be assigned to new mobiles. Thus, for performance reasons, NATs should not be used for PoC!!

11 Private IPv4 Inter-Operator PoC Connectivity with IPv4 Operator1 NAT Public IPv4 Public IPv4 Operator5 NAT Private IPv4 Private IPv4 Operator2 Public IPv4 Public IPv4 Operator6 Private IPv4 NAT NAT Private IPv4 Operator3 NAT Public IPv4 Public IPv4 Operator7 NAT Private IPv4 Private IPv4 Operator4 NAT Public IPv4 Public IPv4 Operator8 NAT Private IPv4 Lots of PoC users require port reservations that can use much of the operator s public IPv4 address space. Current GPRS networks use private addresses almost exclusively.

12 IMS - IP Multimedia Subsystem GGSN IMS (IPv6) WLAN Fixed netw ork IP Multimedia Subsystem (IMS) is an architecture for mobile multimedia services. IMS is an application that needs IPv6 to be successful and widely deployed. For roaming and inter-operator cases. IMS uses Session Initiation Protocol (SIP) IMS enables peer-to-peer applications

13 M ulti-country/operator SIP-connectivity network IMS with IPv6 CSCF SIP Signaling: A s address = Public IPv6 Address 1 Public IP-routing dom ain (inter-operator connections) CSCF Client, Public IPv6 address 1 Media from B to A: Sent to Public IPv6 Address 1 Client, Public IPv6 address 2 Peer-to-peer connections can be expanded to inter-operator and inter-country w henever the operator wants to do so

14 HLR needs to support provisioning of PDP-contexts with type = IPv6 HLR DNS IPv6 basics (for IMS services) APNs supporting IPv6 and IPv6 over IPv4 tunneling. DNS supporting IPv6 APNs & IPv6 address records (AAAA records) IPv6 capable servers (e.g. IMS) Turning IPv6 on is quite simple GGSN & SGSN supporting IPv6 HLR, DNS and Firewall sw update HLR, DNS and GGSN configurations IPv6 server site has an IPv6-capable router IPv6-capable terminals DNS HLR CSCF CPS site router with IPv6 over IPv4 tunneling (may not be needed) SGSN IMS APN GGSN Native IPv6 or IPv6-in-IPv4 tunnels IMS APN GGSN SGSN Support for IPv6 PDP context signaling in SGSN. IPv6 capable Firewalls IPv6 capable terminals

15 IPv6 in

16 3GPP2 IS-835C specifies Simple IPv6 /64 addresses through PPP. no duplicate address detection. Mobile IP MIPv6 is now RFC 3775! IPv6 in 3GPP2 3GPP2 will incorporate this now that MIPv6 has after RFC status in the IETF. 3GPP2 standardization plan for MIPv6 is to be part of IS-835 Rel D (to be published mid-2004) 3GPP2 may also need some context transfers between PDSN s when MIPv6 is deployed. 3GPP2 and 3GPP are Co-operating on IMS 3GPP2 IMS supports both IPv4 and IPv6

17 Transition Scenarios for 3GPP2 Operators Many possible scenarios for network transition. Simple IPv4 -> Simple IPv6 Mobile IPv4 -> Simple IPv6 Mobile IPv4 -> Mobile IPv6 Various choices for upgrading network Upgrade mobile terminals and PDSNs and some services to dualstack. Leave operator core network as IPv4. Upgrade only mobile terminals and some services to dual-stack. Employ transition mechanism on mobile.

18 IPv4 and IPv6 Network DST PDSN Operator Network EDGE ROUTER IPv4/IPv6 Host IPv6 IPv6 Internet IPv6 Host Operator IPv6 Services Operator IPv4 Services ROUTER1 ROUTER2 IPv4 IPv4 Internet IPv4/IPv6 Host Operator Network IPv4/IPv6 Host IPv4 Host

19 Mobile Perspective Dual-Stack Mobile can open an IPv4 only, IPv6 only or both IPv4 and IPv6 connection with the PDSN. Mobile can add or remove IP or IPv6 NCPs at any time. Mobile will use DNS to determine the address family of the end-host. Mobile will decide to use either IPv4 or IPv6 based on the address family of the end-host. Network Perspective PDSN and Edge router must be upgraded to dual-stack. PDSN can tunnel IPv6 packets over IPv4 if the operator core network is IPv4 only. PDSN IPv4 -> dual-stack upgrades are usually software upgrades.

20 Dual Stack Access DST IPv6 packets PDSN Operator Network EDGE ROUTER IPv4/IPv6 Host IPv6 IPv6 Internet IPv6 Host IPv6 tunneled over IPv4 ROUTER1 IPv4/IPv6 Host ROUTER2 Operator IPv6 Services Operator IPv4 Services IPv4 IPv4 Internet IPv6 packets IPv4 packets Operator Network IPv4/IPv6 Host IPv4 Host

21 Advantages of Dual-Stack Does not require tunneling on the wireless link. Pricing issues on wireless usage. Bandwidth and latency issues on the wireless link Services can be upgraded to IPv6 in a phased manner. Use of DNS records (AAAA or A records) is the central control point for transitioning services. Software upgrades required for network entities, for the most part.

22 IPv6 resolves IPv4 address space limitations and enables peer-to-peer connectivity in global scale Co-existence of IPv4 and IPv6. 1.Enable IPv6 in end nodes and networks 2.Make applications use IPv6. Summary Enabling IPv6 in mobile network is relatively straight-forward. IMS era is here Commercial IMS network elements & IMS services (file sharing, peerto-peer gaming,...) piloting in 2004 Wide-scale, commercial IMS deployment in from 2005 onwards IPv6 is an important enabler for IMS However, IPv6 can be used for more than just IMS. Connecting People