Discussion on mobility management 5G standardization and role of ICN

Transcription

1 Discussion on mobility management 5G standardization and role of ICN

2 CT4 study item 3GPP CT4 has initiated a study item to study different mobility management protocols for potential replacement of GTP tunnels between s (N9 Interface) in the 3GPP 5G system architecture of Release 16 (5G Phase 2) References: 3GPP TS (V15.1.0): GPRS Tunnelling Protocol User Plane (GTPv1-U) 3GPP TR (V15.0.0): 5G System Phase 1; CT4 Aspects 3GPP TS (V15.0.0): System Architecture for the 5G System 3GPP TS ( V15.0.0): Policy and Charging Control Framework for the 5G System, Stage 2 ETSI GR NGP 004 (V1.1.1): Next Generation Protocol (NGP): Evolved Architecture for mobility using Identity Oriented Networks Several protocol candidates in IETF: SRv6, LISP, ILA, hicn etc Document prepared in DMM WG as submission to CT4 for consideration

3 Identified objectives wrt GTP-U Definition of a simplified and more efficient mobility management with: No tunnels, no anchors (neither in UP nor in CP) No operation for static/mobile consumers Latency-optimized user plane updates Access-agnostic approach Seamless integration of hetnet

4 Mobility architectures Locator-based ID/Loc separation ID-based Mapping information ID GTP UE#1 GTP#1 Mapping information ID GTP UE#1 GTP#2 UE#2 GTP#3 Mapping System ID Locator UE#1 #1 #2 # /c1 /c2 = content prefixes (eg. b001::/64) hicn FIB hicn FIB Name Faces FW St Name Faces FW St /c1 #1, LoadBal. #2 /c1 /c2 #2 Min. Lat. #2 Min. Lat. UE#1 #1 GTP#1 GTP#2 #3 #1 node id #1 UE#1 #1 #3 #1 /c2 UE#1 #1 #3 #1 /c1 UE#2 #2 GTP-U SRv6 GTP#3 Decentralized; control plane sig. #4 #2 Locators used as identifiers: semantic overloading that complexifies mobility (anchors/tunnels) Lack of flexibility, complex management of synch, does not allow dynamic offload at edge node id #2 UE#2 #2 Decentralized; control plane sig. #4 LISP (ILSR/ILNP) ILA SRv6 #2 Mapping system where to keep udpated / verify Loc/ID binding Challenges : scalability, latency for the verification, issues in caching and synchronization of a distributed mapping system UE#2 #2 /c1 #4 Fully distributed; forwarding plane sig. #2 (draft-vonhugo-5gandip-ip-issues-03) ICN hicn no anchors (neither in UP nor in CP) No operation for static/mobile cons. latency-optimized user plane updates access-agnostic approach seamless integration of hetnet /c1

5 5G Service Based Architecture NEF AUSF NRF PCF UDM AF N1 AMF N2 N4 SMF N4 UE gnb N3 N9 MOBILITY MANAGEMENT

6 Mobile network architecture Internet MEC CELL SITE ACCESS BACKHAUL CORE INTERNET

7 Mobility management subsystem PDU Session Internet Anchor (PSA) USER PLANE Intermediate (-I, optional) N9 N3 UE gnb AMF CELL SITE ACCESS BACKHAUL CORE INTERNET N2 N1 N4 N4 SMF IP address advertisement CONTROL PLANE

8 SSC modes

9 Deployment options Two modes of integration for alternative data planes: 1 «INTERWORKING» MODEL deployment in MEC (within a ) 2 INTEGRATED MODEL replacement of GTP-U in N9 (and N3) interfaces

10 Deployment options Two modes of integration for alternative data planes: 1 «INTERWORKING» MODEL deployment in MEC (within a ) 2 INTEGRATED MODEL replacement of GTP-U in N9 (and N3) interfaces

11 1.a) Integration in MEC Deployment close to the edge Best would be to have symmetrical path Return path require detour due to IP anchoring Local breakout for content prefixes using the UL-CL Internet N3 UE gnb UL-CL N9 PSA AMF CELL SITE ACCESS BACKHAUL CORE INTERNET N2 N9 N4 PSA N4 SMF IP address advertisement N1

12 1.b) hicn as a Internet N9 PSA UE gnb N3 AMF CELL SITE ACCESS BACKHAUL CORE INTERNET N2 N4 N4 SMF IP address advertisement N1

13 Deployment options Two modes of integration for alternative data planes: 1 «INTERWORKING» MODEL deployment in MEC (within a ) 2 INTEGRATED MODEL replacement of GTP-U in N9 (and N3) interfaces

14 2.a) Replacement of N9 interface Internet N3 UE gnb N9 N3 UE gnb CELL SITE ACCESS BACKHAUL CORE INTERNET

15 Impact on protocol stack N3 N9 Application PDU (IP) PDU (IP) relay decap relay GTP-U GTP-U GTP-U GTP-U AN protocol layers AN protocol layers UDP IP UDP IP UDP New data plane UDP IP IP L2 L2 L2 L2 L1 L1 L1 L1 UE gnb

16 + Anchorless mobility Offloading of local communications No traffic on backhaul Internet UE gnb N3 N9 UE gnb N3 hicn CELL SITE ACCESS BACKHAUL CORE INTERNET

17 2.b) Replacement of N9 and N3 interfaces Internet N3 UE gnb N9 UE gnb CELL SITE ACCESS BACKHAUL CORE INTERNET

18 Impact on protocol stack N3 N9 Application PDU AN protocol layers AN protocol layers decap relay GTP-U UDP IP L2 PDU decap GTP-U New data plane New data plane UDP IP L2 L2 L2 L1 L1 L1 L1 UE gnb