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Transcript
ICSI USAIA - Ubiquitous Service Access Internet Architecture Joachim Sokol, ZT IK 2 Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 1 ICSI Some Problems • packets in tunnel not subject for IntServe behavior RSVP tunnel and UDP encapsulation •service classes do not cover additional delay of handoff procedure location dependent service class. QoS is valid only at one location (re-negotiation for others) location independent service class. QoS must be set-up in advance (passive/active reservation) • packets in transit to the previous FA are lost, when MH moves to a new FA buffer management for Mobile IP (request to previous FA to buffer data) • Receiver initiated RESV messages must also follow the detour through tunnel between HA and care-of-address IP-in-IP Tunnel between HA and FA must be used in reverse direction for all RSVP related control traffic. Non-RSVP related data must follow normal routed path. Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 2 ICSI RSVP und MobileIP HA MH Receiver CH Sender Home Network Control & Data in IP in IP Tunnel Foreign Network Backup PATH/RESV message before movement tunneled PATH/RESV message after movement FA Foreign Agent HA Home Agent Internet/Intranet FA MH CH Correspondent Host Sender MH Mobile Host Receiver ICSI - Network Services and Application Sokol, 10/2000 3 ICSI What is necessary ? • hierarchical mobility management to allow fast handoff for real-time communication avoiding complexity wherever possible (additional servers, protocols) • QoS QoS setup in advance with quantitative description of requested QoS termination of RSVP at well-defined location de-coupling of QoS and Mobility (movement do not influence QoS) intelligent CAC backward compatibility to existing approaches as much as possible • end system allow for seamless (wireless) communication policy-based driven communication Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 4 ICSI USAIA Base Stations (Router) transmitting Beacons Ads Provider/domain networks equipped with services and hierarchical mobility management with SFAs and DFA or MPLS capable LSRs CN Slow, Fast Mobility SFA Cellular (D)FA Service availability is the goal ! Internet SFA Most used service will be audio or voice based during movement Cellular HA (D)FA Local, (cells) , AD (subnetworks) Mobility technology, provider independent access Global Mobility (Ads) Cellular SFA (D)MA Access is the killer app ! Local CN Integrated Service Model with Advanced QoS Setup Internet/Intranet MPLS / (DiffServ) ICSI - Network Services and Application Differentiated Services / (MPLS) SFA Subnet Foreign Agent DFA Domain Foreign Agent CN Correspondent Host MPLS Multi Protocol Label Switching Sokol, 10/2000 5 ICSI USAIA Applications Administration Services Network Management Internet/Intranet Local IntServ/ RSVP AD MPLS/ DiffServ Global (DiffServ) Mobility Management ICSI - Network Services and Application QoS Management Sokol, 10/2000 6 . ICSI USAIA contributions from • Joachim Sokol (Siemens AG) • Scott Shenker (ACIRI) • Dietmar Tutsch (TU Berlin) • Jörg Widmer (University Mannhein) • Michael Bahr (Siemens AG) • Henry Owen, Vasos Vassiliou (Georgia Institute of Technology) Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 7 ICSI USAIA Motivation IP equipment (chipsets, networking boxes, ..) are getting more and more cheap wireless access will be common access technology to the Internet information access on current location developing countries without expensive telco infrastructure emergency areas ISP competition on differentiation of available services IP will be the dominating technology of all kind of traffic easy and fast setup of (access-) networks necessary emergencies, events, connectivity in unserved markets, provision of networks with new services Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 8 ICSI USAIA stationary case mobile case QoS 1 2 QoS 3 t0 t 1 2 3 4 5 6 7 t0 t 1) start application at time t0 at location L0. QoS is not available (like busy phone call) 1) start application at time t0 at location L0. QoS is not available like busy phone call) 2) re-start, QoS available at location L0 3) handoff to location L1, no QoS available 3) end application 2) re-start, QoS available at location L0 4) handoff to location L2, partial QoS available 5) and 6) like 3) and 2) 7) end application Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 9 ICSI USAIA T P P (Q (ti,Li,r)) = a P (Q (T, L 1 , r)) t=2 Q (t,L,r) = {0,1} QoS user gets at location L at time t0 <= t <=T for request r a = 1 de-coupling QoS and Mobility Mechanisms: • new handoff protocol LHP for QoS support • modified RSVP for signaling in advance • overlapping cell areas • bandwidth partitioning in BS • control layer in end system • extension of Controlled-Load Service Class • load-dependent refresh time interval for reservation in advance Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 10 ICSI USAIA RSVP ext Application Proxy IP Higher Layer IP bandwidth control ==> RSVP ext LHP Control WST1 WST2 ... wired • MN extended for control layer • sense signal strength • triggers RSVP for advanced reservation • Local Handoff Protocol (LHP) continuous reservation (active/passive) initial reservation best effort MAC / PHYS • beacons indicating available BW • load balancing (frequency of beacons) • passive reservations • RSVP termination in BS for passive reservation • mapping to DiffServ / MPLS • passive reservations with modified RSVP • Local Handoff Protocol (LHP) • bandwidth partitioning (BE shares passive area) • QoS range in Controlled Load Service Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 11 ICSI USAIA Old BS New BS MN Router/local CHs Beacon [QoS] Announce Data Announce_Ack .. . Passive RESV RESV_Conf . . . Announce [T] Announce_Ack Notify Data Gratuitous ARP Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 12 ICSI USAIA active reservation passive reservation movement path BS3 BS3 BS3 BS1 BS1 BS1 timeout BS2 BS2 Internet/Intranet BS2 active reservation active and passive reservation (1) (2) ICSI - Network Services and Application passive reservation turns into active (3) Sokol, 10/2000 13 ICSI USAIA current work • extensions for ns tool for modified RSVP, LHP • prototype (Linux) based on HUT (Helsinki University of Technology) • mathematical description of USAIA (Markow chains) • Ph.D. for derivation of “mobile” related parameters for CLS • mapping to future generation of wireless networks (3G, 4G, 5G ?) • generic study of “reservation of in advance” mechanisms Internet/Intranet ICSI - Network Services and Application Sokol, 10/2000 14 ICSI GPRS AD local global SGSN QoS “islands” Server RAN BS per cell Site 1 B S C Multicast “islands” ubiqitious and arbitrary access HLR GPRS backbone SGSN PDN (Internet) Site 2 RAN MSC/VLR SGSN Site 3 Tunnel RAN Internet/Intranet GGSN ICSI - Network Services and Application BSC: Base Station Controller GGSN: Gateway GPRS Support Node HLR: Home Location Register MSC: Mobile Switching Center PDN: Packet data network SGSN: Serving GPRS Support Node VLR: Visitor Location Register Sokol, 10/2000 15 ICSI UMTS U-plane Application E.g., IP, PPP, OSP E.g., IP, PPP, OSP Relay Relay PDCP PDCP GTP-U GTP-U GTP-U GTP-U RLC RLC UDP/IP UDP/IP UDP/IP UDP/IP MAC MAC AAL5 AAL5 L2 L2 L1 L1 ATM ATM L1 L1 Uu MS Internet/Intranet Iu-PS UTRAN ICSI - Network Services and Application Gn 3G-SGSN Gi 3G-GGSN Sokol, 10/2000 16