Mobile RSVP Srinivas Guntupalli Vivekananda Tadala Amar Agrawal
Outline • RSVP • Problems in mobile environment • Mobile IP • Resource Pre-reservation • Common Path Identification • Mobile Proxy • Conclusion
RSVP R2 R1 R5 Sender Receiver 2 R4 R3 PATH RESV Receiver 1
Problems with Mobility • New packet path QoS breaks. • Resources may not be available for the new path. • Handoff latency. • Different QoS mechanisms.
QoS Requirements • Minimize handoff delay. • Localize changes to only affected parts of the packet path. • Release any old QoS state after handoff as early as possible. • Deal with multiple QoS mechanisms deployed.
Mobile IP • Handles mobility. • Home Agent, Foreign Agent. • Care-of-Address. • Tunneling : IP-in-IP Encapsulation • Triangular Routing problem. • RSVP packets hidden from intermediate routers.
Triangular Routing Problem 3 2 Home Agent Foreign Agent 4 MIPv6 Mobile Host 1 5 Sender
RSVP Tunnel Sender Home Agent Foreign Agent Mobile Host Path Tunnel Path IP-in-IP (Path) Path Tunnel Resv Resv Tunnel Resv Conf. IP-in-IP (Resv) Resv
Resource Pre-Reservations • Minimize QoS re-establishment delay after handoff. • When and Where? • MRSVP – Active / Passive reservations. • Multicast support. • Call dropping rate Vs Call admission rate.
Common Path Identification • New reservation path overlaps significantly with old path. • Changes must therefore be localized. • Smart Anchor point / Merge point. • MIPv6 : Change filters along the reservation path if MN moves to a new location (CoA).
Mobile Proxy • Refresh overhead over battery-starved mobile host. • Delegate responsibility to a mobile proxy. • Handles reservations on behalf of MH. • Transparent to QoS mechanism (IntServ, DiffServ) deployed in the network. • Normally located at access point.
MRSVP Sender 1. Spec 2. PATH 3a 2 3a. Active RESV Router 3b. Passive RESV 3b 3a Router 2 2 Router 2 2 2 3b 3a 3b 1 1 Spec Spec Proxy Proxy Proxy Proxy MN
MRSVP - Handoff Sender Active Reservation Router Passive Reservation Router Router Proxy Proxy Proxy Proxy Handoff MN MN
MRSVP – After Handoff Sender Active Reservation Router Passive Reservation Router Router Proxy Proxy Proxy Proxy MN
MRSVP with Multicast Sender 1. Spec 2. IGMP Router 2 Router Router 2 2 1 1 Spec Spec Proxy Proxy Proxy Proxy MN
MRSVP with Multicast Sender 1. PATH 2a. Active RESV 2b. Passive RESV 2a 1 Router 2b 2a Router 1 1 Router 1 1 1 2b 2a 2b Proxy Proxy Proxy Proxy MN
Conclusion • QoS for mobile hosts using RSVP over Mobile IP. • Advance reservations, common path identification and mobile proxy. • QoS at the cost of call admission.
References • A. Terzis, J. Krawczyk, J. Wroclawski, and L. Zhang. Rsvp operation over ip tunnels. RFC 2746, Jan 2000. • Anup Kumar Talukdar, B. R. Badrinath, and Arup Acharya. Mrsvp: a resource reservation protocol for an integrated services network with mobile hosts. Wirel. Netw., 7(1):5–19, 2001. • Wen-Tsuen Chen and Li-Chi Huang. Rsvp mobility support: A signaling protocol for integrated services internet with mobile hosts. pages 1283–1292, 2000. • Chien-Chao Tseng, Gwo-Chuan Lee, Ren-Shiou Liu, and Tsan-Pin Wang. Hmrsvp: a hierarchical mobile rsvp protocol. Wirel. Netw., 9(2):95–102, 2003. • Ed. H. Chaskar. Requirements of a quality of service solution for mobile ip. RFC 3583, Sep 2003. • Nen-Fu Huang andWhai-En Chen. Rsvp extensions for real-time services in hierarchical mobile ipv6. Mob. Netw. Appl., 8(6):625–634, 2003.