1 / 15

IPv6 in 3GPP Evolved Packet System draft-korhonen-v6ops-3gpp-eps-04

IPv6 in 3GPP Evolved Packet System draft-korhonen-v6ops-3gpp-eps-04. Jouni Korhonen , Jonne Soininen , Basavaraj Patil , Teemu Savolainen , Gabor Bajko , Kaisu Iisakkila V6OPS IETF #79. Overview. Describes 3GPP Release-8 Evolved Packet System and Evolved Packet Core architectures.

mingan
Download Presentation

IPv6 in 3GPP Evolved Packet System draft-korhonen-v6ops-3gpp-eps-04

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. IPv6 in 3GPP Evolved Packet Systemdraft-korhonen-v6ops-3gpp-eps-04 JouniKorhonen, JonneSoininen, BasavarajPatil, TeemuSavolainen, Gabor Bajko, KaisuIisakkila V6OPS IETF #79

  2. Overview • Describes 3GPP Release-8 Evolved Packet System and Evolved Packet Core architectures. • And some Release-9 and -10 IPv6 related features. • Explains how IPv6 is supported in the architecture and the different types of bearers. • Explains some of the basic concepts and terminology of 3GPP IP access. • Mostly about “what is already there ” not about all possible enhancements..

  3. Some Common Terminology.. • EPC = Evolved Packet Core • RAN = Radio Access Network • EPS = Evolved Packet System (EPC + RAN) • eNodeB = evolved NodeB i.e. base station in EPS • 3GPP Access = radio system developed by 3GPP • Non-3GPP Access = radio system not developed by 3GPP • UE = User Equipment i.e., a mobile host, wireless device • APN = Access Point Name • PDN = Packet Data Network i.e. an IP network • SGSN = Serving GPRS Support Node • GGSN = Gateway GPRS Support Node • SGW = Service Gateway • PDN-GW = Packet Data Network Gateway • MME = Mobility Management Entity • Release-x = named version of the GPRS/EPS architecture (eg. Rel-8, Rel-9 etc)

  4. Basic Evolved Packet System Architecture • Architecture supports EUTRAN and legacy 2G/3G accesses as well. • PtP link is established between the UE and the P-GW. • User-plane traffic always tunneled over the transport network. • User-plane addressing independent of transport network addressing and IP versions. MME S1-MME S11 PDN / IP Services UE eNodeB SGW PDN-GW LTE-Uu S1-U S5/S8 SGi Dual-Stack EPS Bearer

  5. PDN Connection • A PDN Connection is an association between an UE and a PDN, represented by one IPv4 address and/or one /64 IPv6 prefix. • A PDN is identified by an APN and a PDN is accessed via a PDN-GW • A PDN is responsible for the IP address/prefix management. • On an UE a PDN Connection is equivalent (or visible to an IP stack) as a network interface. • Pre-Release-8 “equivalent” for a PDN Connection is the PDP Context (used in GPRS). APN points to a specific PDN-GW and “names” the PDN.. Operator Core & RAN SGi PDN S5/S8 UE PDN-GW Point-to-point connection UE sees the PDN Connection as an interface with an address/prefix that belongs to the PDN.. PDN-GW is UE’s first-hop router and mobility anchor for the address/prefix.. Addresses/prefixes belong topologically to a PND..

  6. EPS Bearer Model • A logical concept of a bearer has been defined as an aggregate of one or more IP flows related to one or more services. • The EPS bearer is between the UE and the PDN-GW, and used to transport IP (v4 and/or v6) packets. • The UE performs the binding of the UL IP flows and the PDN-GW performs the binding of the DL IP flows.

  7. Access Point Name concept • UEsand network use APNs to identify a network (e.g. internet, corporate  intra-network, etc) and to some extent the associated services in that  network. Example “internet.example.com” • APNsare piggybacked on the administration of the DNS namespace. Release-8 uses extensively S-NAPTR, where are pre-Release-8 was just A/AAAA. • During the connection (bearer) setup, APNs are used (by SGSN/MME) to  discover the gateway (GGSN/PDN-GW) that provides the IP connectivity  to the network identifier by the APN, supported protocols, topological location collocation properties of gateways.

  8. Access Point Name concept cont’d • UE would just request an APN e.g. for “internet” or request nothing.. • MME either figures out the “default” APN for the UE/subscriber.. or • ..MME would substitute a full domain name of the APN received from the UE • MME would then: • Query a NAPTR for the domain • Select the NAPTR which matches the required protocols and such.. • Query A/AAAA for both SGW and PDN-GW • Push the “selected” PDN-GW address to “selected“ SGW $ORIGIN epc.mnc123.mcc345.3gppnetwork.org. ... internet.apn IN NAPTR 10 1 "a" "x-3gpp-pgw:x-s5-gtp" "" topoff.b1.gw1.nodes IN NAPTR 20 2 "a" "x-3gpp-pgw:x-s5-pmip” "" topoff.b1.gw2.nodes ... topoff.b1.gw1.nodes IN A 192.0.2.113 IN A 192.0.2.114 IN AAAA 2001:db8:0:c:0:0:0:0 IN AAAA 2001:db8:0:d:0:0:0:0 topoff.b2.gw2.nodes IN A 192.0.2.143 IN A 192.0.2.144 IN AAAA 2001:db8:0:2a:0:0:0:0 ... DNS MME S11 PDN / IP Services UE eNodeB SGW PDN-GW S5/S8 SGi

  9. IP configuration and address management • IPv4 Address Configuration. • Two methods: DHCPv4 or within the EPS bearer setup signaling (the common way) • DHCP is optional on both the UE and the P-GW. • IPv6 Address Configuration. • One method: Stateless Address Autoconfiguration after the bearer setup. • A single /64 prefix is only supported. • Additional configuration either using: • Stateless DHCPv[46]; or • Using protocol configuration options during NAS signaling (“layer-2” control signaling).

  10. EPS Bearer Types • IPv4 only bearer. • The bearer is configured with one IPv4 address. • The link is “IPv4 only”. • IPv6 only bearer. • The bearer is configured with one /64 prefix. • The link is “IPv6 only”. • IPv4v6 bearer. • The bearer is configured with both IPv4 address and one /64 prefix. • New bearer type since Release-8. • The link is “dual-stack”. • V4v6 bearer type is the default in Rel-8 and beyond • Rel 9 has also introduced the DS PDP context type for UTRAN and EDGE

  11. PDN Connection Establishment MME SGW UE eNodeB PDN-GE HSS/AAA • Attach request • Auth/AuthZ phase • Create Session Request • Create Session Response • Initial context setup request/Attach accept • Radio bearer reconfig • Initial context setup response • Direct transfer • Attach complete • UE starts sending UL data • Modify bearer request • Modify bearer response • DL data transmission starts 1) 1) Authentication and Authorization 2) 3) 3) 4) 4) 5) Address/ prefix allocation RB Setup 6) 7) 8) 9) UL Data 10) 11) 12) DL Data 13)

  12. Dual-Stack Approach for IP Access • Networks prior to Release-8 • Dual-stack connectivity possible by opening two parallel PDP Contexts of types IPv4 and IPv6. • Shows up as two separate layer-2 connections. • Networks from Release-8 onwards. • A single IPv4v6 PDN Connection in addition to having separate v4 and v6 PDN connections. • Shows up as one layer-2 connection with both IPv4 and IPv6 addresses to the IP stack.

  13. A peek to Release-9 and -10 • Release-9 will introduce IPv4v6 PDP Context type also for GPRS (i.e. 3G, HSPA, ..): • Means Gn/Gp interfaces and GTPv1 are updated to understand the new PDP Type. • Release-10 will introduce prefix delegation: • Based on RFC3633. • Due 3GPP link model and architectural decisions some more work in IETF is needed. • See draft-ietf-dhc-pd-exclude.

  14. Dual-stack approach In Rel 8 and beyond networks DS-PDN S-GW P-GW eNodeB BS Type v4v6 PDN connection MME In Pre Rel 8 networks IPv4-APN IPv4-PDP Context IPv4-PDN GGSN SGSN IPv6-APN IPv6-PDN IPv6-PDP Context GGSN

More Related