SimpleCore: an appeal for less complex core networks

Transcription

1 Handle with care 2016 DOCOMO Communications Laboratories Europe GmbH All rights reserved Unauthorized photocopy/replication and removal from company premises are prohibited Appropriate disposal by security BOX/shredder SimpleCore: an appeal for less complex core networks 5G PPP 1 st 5G Architecture Workshop April 6 th, 2016 Copyright 2016 DOCOMO Communications Laboratories Europe GmbH

2 Motivation: Need for a paradigm shift due to business and technical situation : 2019 traffic prediction : traffic consumption 20% others 20-30% outside 80% video 70-80% indoor Video works well with best effort and changing IPs (buffering, DASH, ) Indoor traffic: low/no mobility (nomadic behavior) Observation: for a large fraction of traffic Best effort is good enough Mobility support is not needed (no IP address preservation needed) Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 2

3 Problem statement HTTP Video streaming Twitter A lot of applications work well with a best effort, no mobility support model More than best effort* S10 OFCS S6a Gz HSS MME OCS S11 Gy S1 -MME enb LTE Ext. IP Net P-GW S-GW S1 -U SGi X2 Gx S5/S8 Rx PCRF Best effort Gxc However, the mobile network applies a one size fits all solution. Every packet stream gets mechanisms for Traffic differentiation (bearers) Mobility support (stable IP address) even if not needed! Problem statement How to support best effort, no mobility traffic (like HTTP, DASH video, ) more efficiently than with current EPC: Less overhead in data plane processing Less signaling effort *IP level QoS, traffic differentiation, mobility support Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 3

4 SimpleCore concept Service Provider (SP) PDN 10.*.*.* -> DCM PDN router SGi 10.1.*.* -> A 10.2.*.* -> B SGi Peering router B D A E * -> D * -> D * -> E * -> E enb enb enb enb x x x x enb LTE X SimpleCore Topologically correct IP for UE IP packets can be routed enb change IP address changes Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 4

5 5G and Standardization Related use cases are Broadband access in dense areas/everywhere, Massive IoT (NGMN 5G White Paper) Mobility on demand, SMARTER Service Continuity (3GPP SMARTER) Related technologies are Network Functions Virtualization (as standardized in ETSI NFV) Network slicing (3GPP SMARTER TR22.891; 3GPP FS_NextGen TR ) Such technologies, e.g. allow for providing a basic service that is connectionless, best effort and without support for node mobility extended capabilities if explicitly requested by an application Carrier-grade slice enb MME https, vpn, AAA User A SGW PGW enb Video, http AAA User B Best effort slice Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 5

6 Mobility-needed/mobility-less application in parallel Voice call* *example only (for more than best effort ) UE application behaviour Internet surfing time SIPTO EPC + SIPTO Connected time EPC-ATTACH e.g. API call on UE EPC bearer on demand Better than best effort SimpleCore Best effort SimpleCore-ATTACH EPC-ATTACH* EPC-DETACH* time Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 6

7 Experimentation: IP push protocols GCM: google TM cloud messaging Client App seems to hold connection to GCM connection server Client identification via unique ID assigned in registration with GCM Messages are sent to unique ID APNs: TM Push Notification service Client App seems to hold a connection to APNs server Client identification via device token Messages are pushed via Apple s own servers to client Works via WiFi and cellular Unique ID of client App IP address changes are no problem Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 7

8 Experimentation: Google Hangouts TM Demo setup Smartphone, 3 WIFI APs Cloud Chat-bot regularly sends messages to smartphone via Google Hangouts TM Time: 17:16:43 Time: 17:17:02 Time: 17:17:18 AP1 AP2 AP3 IP address changes are no problem and messages are received in a timely manner Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 8

9 Video Position [ms] Experimentation: DASH video Demo setup: Smartphone, 3 WIFI APs Smartphone changes access point every 5 seconds Wifi Cellular Internet Buffer Status during video streaming Cellular NW A Access Point Video Seg 4-6 Cellular NW B Video server Android smartphone Access Point 2 Internet Access Point 3 Cellular NW C IP address changes are no problem and no stalling was observed Session time [s] Playout Position Buffer Position AP Change 1und1 AP Change EUL1 AP Change EUL2 Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 9

10 Conclusion Today's mobile core networks are highly complex due to backwards compatibility and the requirement to always deliver the best possible service 4G core network provides mobility support and QoS to all traffic Traffic intensive applications (>80% of traffic) like video / web surfing can handle node mobility at application layer and anyway traverse the best effort Internet Such applications (70% of traffic) are mainly consumed indoors, by quasi-static users Technologies like network slicing and virtualization allow to adapt to such properties - Slice with extended capabilities like mobility support - Default basic slice is connectionless, best-effort, no mobility network "SimpleCore" provides a solution for such basic slice using a hierarchical IP address assignment, where a UE s IP address will change when doing handover between enbs Experiments with push notifications and video streaming provided promising results Copyright 2016 DOCOMO Communications Laboratories Europe GmbH 10

11 Dr. Wolfgang Kiess Dr. Gerald Kunzmann Dr. Srisakul Thakolsri DOCOMO Communications Laboratories Europe GmbH Landsberger Strasse Munich, Germany Phone: +49 (89) Copyright 2016 DOCOMO Communications Laboratories Europe GmbH