Mobility Management Concept for Always-Best-Connected Network

Transcription

1 University of Jyväskylä Faculty of Information Technology Department of Mathematical Information Technology Mobility Management Concept for Always-Best-Connected Network Jari Kellokoski University of Jyvskylä

2 Content Research problem Background Always Best Connected Implementation, Measurements and Results On Going Work Summary

3 Research Problem Creation of software architecture that can enable always most suitable connection to IP network (in a heterogeneous network environment) Always Best Connected (ABC) IP Network: what is the best/most suitable In term of cost, throughput, latency, current consumption and large number of other criteria? Performance Analysis Network change time Secure communication Suitability to real-time communication Co-operation with existing/coming standards The proposed solution must work in co-operation with 3GPP and IETF standards such as: Evolved Packet Core, IPSec

4 Background End user devices (mobile phones, tablets) are equipped with more than one radio access (e.g. Cellular, WiFi, Bluetooth) Number of hotspot style networks (specially WiFi) has increased Traditional hotspots such as in airports, hotels, coffee shops And they are also available in large number in home and in companies The Evolved Packet Core (EPC) was introduced in 3GPP Release 8 in 2008 along side with LTE. Key improvements from architecture point of view was all IP model and a simplified structure in every way Most significantly (regarding to ABC) it allows connectivity from non-3gpp access, such as WiMAX, cdma2000 and WiFi How to utilize IETF protocols such as Proxy Mobile IPv6 for seamless handovers between different radio access networks (vertical handovers)?

5 Always Best Connected in terms of EPC Access Gateways: different depending on radio access e.g. LTE, trusted non-3gpp and untrusted non-3gpp Access Network Discover and Selection Function ANDSF will help UE to find suitable access Pros: UE don t need to turn on multiple radios in order to discover networks Cons: User is not in control, dictated by the operator

6 Always Best Connected Big Picture

7 Implementation Android Application Applications can Scan available networks Can switch between networks Prioritize networks Show user applications Show which of the user applications use network Networks are prioritized: 1. Valid ANDSF information is available? 2. Application is part of profile, is the profile active/valid? 3. Application is real-time? Always ask for used accesspoint 4. Known protected WLAN connection is available? 5. Open WLAN connection is available? 6. Use cellular IP connection The Android ABC application permission page

8 Test Setup

9 Results Test done without any optimization and without Mobile IP Service continuity was dependent on application implementation as the IP address was changed during the network WLAN (ms) σ 3G (ms) σ Android Qt WLAN (ms) σ SSL with VPN (Android) SSL tunnel only (Android) IPSec in Linux Android implementation Samsung Galaxy S2 Qt implementation Nokia N900 Linux implementation MiniLaptop with Intel Atom processor

10 Results

11 On Going: Simultaneous Connections/Multihoming Currently Android is not supporting simultaneous connections. Previous connection is closed and all connection related data is flushed before new connection takes place (e.g. switching from 3G to WiFi connection) Internet Egineering Task Force (IETF) working group propose Proxy Mobile IPv6 (RFC 5213) as a baseline for Network Based Localized Mobility Management (NetLMM) This protocol is not supported by default in Android nor is the IPv6 NetLMM and IPv6 require modifications for current Android framework Many mobile devices can be connected by multiple paths, but TCP restricts communications to a single path per transport connection Multipath TCP (MPTCP) and Stream Control Transmission Protocol (SCTP) are trying to loosen the original TCP so that more efficient connection usage would be possible Simultaneous connections are the first step in this direction

12 Simultaneus Connection Results Connection change takes around 204 ms. It close to acceptable for real-time communication Tradeoff is the power consumption

13 Summary ABC Concept is required in All-IP Network environment Standards are levering the path for common Next Generation Network 3GPP Evolved Packed Core: IETF Operator driven solution ANDSF information from the operator Lack of IPSec and Proxy Mobile IP, IPv6 support (Android) Multipath TCP and Stream Control for Multihoming Lack of protocol support (Android) Performance Standard Android: Network switch performance was implementation dependent and by default way too slow for real-time communication (~1 second between WLAN to WLAN in open network, real-time requirement ~ ms) With modified Android: 204 ms connection change time but power consumption trade-off In future: Multihoming in Android Mobility management in Multihoming network environment

14 Publications Efficient Handovers for Machine-to-Machine Communications Between IEEE and 3GPP Evolved Packed Core Networks, Machine-to-Machine Communications and Networking Workshop, 2012, Besancon France Context and Location Aware Always-Best-Connected Concept for Heterogeneous Network, Wireless Days 2012, Dublin, Ireland Challenges of the Always-Best-Connected Enablers for User Equipment in Evolved Packet System, International Congress on Ultra Modern Telecommunications and Control Systems 2012, St Petersburg, Russia Power Consumption Analysis of the Always-Best-Connected User Equipment, New Technologies, Mobility and Security 2012, Istanbul Turkey Real-life Performance Analysis of Always-Best-Connected Network, New Technologies, Mobility and Security 2012, Istanbul Turkey User-Centric Approach to Always-Best-Connected Networks, International Congress on Ultra Modern Telecommunications and Control Systems 2011, Budapest Hungary Location-Based Service with Spatial Data Analysis within IP Multimedia Subsystem, Advances in Future Internet 2011, Nice France Registration Performance Comparison Between IP Multimedia Subsystem and Session Initiation Protocol Networks, International Congress on Ultra Modern Telecommunications and Control Systems 2010 Moscow Russia Call and Messaging Performance Comparison Between SIP AND IP Multimedia Subsystem Networks, The Fourth International Conference on Internet Multimedia Systems Architecture and Applications 2010 Bangalore India