IPv6 Moving Network Testbed with Micro-Mobility Support

Transcription

1 IPv6 Moving Network Testbed with Micro-Mobility Support Miklós Aurél Rónai 1, Kristóf Fodor 1, Ralf Tönjes 2 Ericsson Research, 1 Traffic Lab (Hungary), 2 Eurolab (Germany) {Miklos.Ronai, Kristof.Fodor, Ralf.Toenjes}@ericsson.com 28 June

2 Scenario Multitude of radio access networks available (GPRS, UMTS, WLAN, ) Moving vehicles with many passengers interconnected built-in devices Powerful smartphones/pdas and laptops used outside and inside of vehicles GPRS Internet UMTS WLAN Efficient mobility management for devices having the same mobility pattern is needed! 28 June

3 Moving networks network segments that can change their point of attachment to the Internet; Mobile Router (MR) special gateway to the Internet; handles mobility of the network; Problem GPRS Internet UMTS movement of the network: Moving network mobility management has to support transparency, roaming and multiaccess; movement of the users inside (large vehicles); MR WLAN 28 June

4 MR-HA tunneling CN IETF NEMO proposal; bi-directional tunnel; between MR and its HA; HAMN HAMR Internet MR BCMP for local mobility MN seamless IP handovers; anchor point and user registry co-located with MR; BARn ANP MR UR based on tunneling; BAR1 MN 28 June

5 Ericsson s testbed Based on MIPL stack; Internet Internet CN USB camera 2 types of HOs between ARs of the access system (radio unaware, radio aware); VGGSN HA MR Vertical HO to GPRS; Vertical HO to UMTS; MRHA-BCMP interworking; Local BCMP handoffs inside the IVAN; BAR2 UMTS S VMN BAR1 GPRS FB AR1 AR2 MRHA MRHA MRHA tunnel tunnel MRHA tunnel tunnel MR ANP UR Support for mobility unaware nodes (LFN) inside the IVAN; hub LFN 28 June

6 IP Handover types 1. Type 1: Radio unaware IP handover (no interaction between IP layer and radio) IP detection time Radio handover decision Radio HO time IP HO time Type 2: Reactive IP handover (IP layer notified after radio handover) Radio handover decision Radio HO time IP HO signaling trigger Type 3: Proactive IP handover (IP layer notified before radio handover) handover preparation signaling at IP layer trigger Radio handover decision Radio HO time IP HO signaling trigger Old New Old New Old New 28 June

7 IP Handover types 2. Type 4: Make-before-break handover (new is up before old link goes down) Old Radio handover decision Link setup time IP HO signaling New trigger 28 June

8 IP Handover Types Summary Type 1: Radio unaware IP handover (no interaction between IP layer and radio) The original Mobile IP model. It is usable mainly for portability Type 2: Reactive IP handover (IP layer notified after radio handover) Typical assumption for basic IP mobility protocols (BCMP unplanned HO) Type 3: Proactive IP handover (IP layer notified before radio handover) Typical assumption today for fast handover protocols (BCMP planned HO) Type 4: Make-before-break handover (new is up before old link goes down) Very good performance, but puts special requirements on radio 28 June

9 Measurements Radio unaware IP Handover number of HO outage times intervals of HO outage times Histogram of handover outage time when ARs disappear periodically Average outage time: 4080 ms 28 June

10 Measurements Make-before-break IP handover Radio interfaces of both access routers turned on; MR and access routers on the same radio channel; UDP packets sent in every 2 milliseconds; Handover in every 2 seconds; 0.7 % of packet loss in average outage time: 1.4 ms; 28 June

11 Measurements Comparison HO outage time (milliseconds) Type 1 HO Type 2 HO (BCMP) Type 3 HO (BCMP) Type 4 HO 28 June

12 Measurements UMTS Network Ping packets from home agent to local fixed node inside the moving network; Downloading file from the Internet to the local fixed node; Video streaming from correspondent node to the local fixed node; Average delay: 220 ms Average bandwidth: kbit/s 28 June

13 Conclusion We built a moving network testbed supporting horizontal and vertical handovers; We combined macro-mobility (MIPv6) protocol with micromobility protocol (BCMP); Radio unaware IP handover performs very poor; Make-before-break IP handovers are desired, but needs special radio; It is crucial to take some information from the radio (e.g.,triggers) into account to improve handovers (reactive, proactive IP handovers); 3G provides enough bandwidth for real time video; 28 June

14 Thank you for your attention! 28 June