Sideseadmed (IRT0040) loeng 4/2012. Avo

Transcription

1 Sideseadmed (IRT0040) loeng 4/2012 Avo 1

2 Internet Evolution BACKBONE ACCESS NETWORKS WIRELESS NETWORKS

3 OSI mudeli arendus 3

4 Access technologies PAN / CAN: Bluedooth, Zigbee, IrDA ( WiFi ) LAN: WLAN ( Flarion ) MAN: Flash-OFDM WAN: 3G/4G ( InmarsatBGAN ) GAN: Satellite 4

5 General Problems (1) Network detection NIC needs to be active Example #1: WiFi needs to be active How to detect an alternative network while a connection is active? 5

6 General Problems (2) Network subscription Networks needs to be preconfigured WiFi: al lot of different authentication methods, access data for each network ( Certificate (Key, Password, ( solutions 3G/4G: SIM card (Multi-SIM Usually, contract with provider(s) required Quality evaluation of connected and unconnected networks 6

7 General Problems (3) Seamless handover? Fast intra-technology or inter-technology handover Make-before-Break scenarios (. etc Mobility solution (e.g. MIPv4/v6, SIP 7

8 Break-before-Make

9 Make-before-Break

10 IEEE Standardid RFC 5184 Unified Layer 2 (L2) Abstractions for Layer 3 (L3)-Driven Fast Handover 10

11 Quality Evaluation Depends on many factors Signal strength and noise level; SNR, related to channel coding Radio propagation and channel multiplexing Moving speed Network interferences (e.g. different WiFi ( channel networks on the same ( problem Collisions (e.g. in WiFi hidden node Network load 11

12 FLASH-OFDM Fast low-latency access with seamless handoff orthogonal frequency division multiplexing F-OFDM, is a system that is based on OFDM and specifies also higher protocol layers 12

13 IEEE == is an IEEE standard. The standard supports algorithms enabling seamless handover between networks of the same type as well as handover between different network types also called Media independent handover (MIH) or vertical handover. The standard provides information to allow handing over to and from cellular, GSM, GPRS, WiFi, Bluetooth, and networks through different handover mechanisms

14 Clean slate approach Redesigning the Internet in Clean slate approach has attractedconsiderable attention. In clean slate approach, several network architectures are proposed, which are not based on the layered model. 14

15 Cross-layer collaboration Layered model with cross-layer collaboration and split of the data plane and the control plane 15

16 Cross-layer collaboration (1) introducing the layer-5 to provide the applications with more abstract communication paths, (2) Introducing cross-layer collaboration for efficient processing in each layer, (3) splitting the node identifier and the node locator for mobility, multihoming and security, (4) splitting the data plane and the control plane for manageability (5) introducing a recursive layered model to support network virtualization 16

17 Media Independent Handover (MIH) is a standard being developed by IEEE to enable the handover of IP sessions from one layer 2 access technology to another, to achieve mobility of end user devices. 17

18 M I H (1) 18

19 M I H (2) 19

20 802.21: Key Services Link Layer Triggers State Change Predictive Network Initiated Handover Commands Client Initiated Network Initiated Vertical Handovers Network Information Available Networks Neighbor Maps Network Services

21 IEEE IETF seosed Applications (VoIP/RTP) Connection Management Handover Policy Handover Management Mobility Management Protocols MIH Function Smart Triggers Handover Messages Information Service L2 Triggers and Events Handover Messages Information Service WLAN Cellular WMAN Protocol and Device Hardware 21

22 Service Access Points

23 Existing: Handover Services Higher Layer Transport Higher Layer Transport MIH Users Higher Layer Higher Layer Transport MIH Users Higher Layer Higher Layer Transport MIH Users MIH Function MIH Function Information Repository MIH Function 3GPP/ 3GPP2 Interface MGMT DATA 802 Interface DATA MGMT 802 Interface 3GPP / 3GPP2 Network Multi RAT Mobile Node 802 Network Legend MIH Message Transport MIH Local Interface 23

24 Technology-Enabled Care Services Personal Health Maintenance Older Adult Data Analysis & Archiving Service Provider Adult Child Improved Communications Healthcare Professional Preventive Interventions

25 Home for Life Senior (Quality of Life) Supportive Services Safety Wellness Health Socialization Physical Environment

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27 StrokeNet

28 MT WY ID WA OR NV CA AZ ND SD NE CO NM OK KS AR MO IA MN WI IL IN KY TN MS GA FL SC NC VA WV OH MI MD DE CT RI MA ME VT NH AK Telehealth Resource Centers HI Mid-Atlantic TRC Northeast TRC Upper Midwest TRC

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