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SHIP: Performance. Reference: “SHIP mobility management hybrid SIP-HIP scheme” So, J.Y.H.; Jidong Wang; Jones, D.; Sixth International Conference on 23-25 May 2005 Page(s):226 - 230 Digital Object ID 10.1109/SNPD-SAWN.2005.68. Background .

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ship performance

SHIP: Performance

Reference: “SHIP mobility management hybrid SIP-HIP scheme”

So, J.Y.H.; Jidong Wang; Jones, D.;

Sixth International Conference on 23-25 May 2005

Page(s):226 - 230

Digital Object ID 10.1109/SNPD-SAWN.2005.68

  • In the current wireless networks, wireless management can be handled in Data Link Layer or Physical Layer
  • In the 4G wireless networks, handover between different wireless networks can’t be handle by the old method
  • Network Layer and Application Layer are the most suitable layers for the mobility management
session initiation protocol
Session Initiation Protocol
  • An Application Layer protocol used to create or tear down multimedia session
  • Can perform mobility support that is independent of the underlying wireless technology and network layer element in the Application Layer
  • The best choice for real-time application only
session initiation protocol cont
Session Initiation Protocol (cont.)
  • Application Layer protocol will get lowest priority in networking model and so a long delay in hand-off will occur
  • Doesn’t support mobility in other connections that aren’t created under SIP
  • Hybrid SIP and other protocols are considered by many research
  • changing addresses or ports, adding a media stream, deleting a media stream, etc.
    • re-INVITE
host identify protocol
Host Identify Protocol
  • Introduces a new namespace - Host Identity and a new layer - Host Identity Layer
  • HI (Host Identifier) is represented with a 128-bit long HIT (Host Identity Tag)
  • HI that is a cryptographic key of a public-private key-pair will be used to identify node and endpoint instead of IP addresses
host identify protocol cont
Host Identify Protocol (cont.)
  • 4-way handshake
  • Diffie-Hellman authenticated key is exchanged during handshake
  • Diffie-Hellman key is used to establish a pair of IPsec ESP (Encapsulated Security Payload) SAs (Security Associations) between hosts
4 way handshake of hip
4-way handshake of HIP

Initiator Responder

I1: trigger exchange

Select pre-computed R1

R1: puzzle, D-H, key, sig

Check sig Remain stateless

Solve puzzle

I2: solution, D-H, {key}, sig

Compute D-H Check puzzleCheck sig

R2: sig

Check sig Compute D-H

Security Context established

ESP protected messages

hip packet structure
HIP packet structure
  • Packets traveling in the network doesn’t contain the actual HI information
hip packet structure cont
HIP packet structure (cont.)
  • Arriving packets is identified and mapped to the correct SA using the SPI (Security Parameter Index) value in the IPsec header
hip mobility
HIP - mobility
  • DNS may not be able to update immediately
  • RVS (Rendezvous Server) is similar to the HA in Mobile IP
  • DNS will carry the mapping between FQDN and the corresponding RVS IP addresses
  • Direct mapping between HI and IP addresses of the host will be stored in RVS
hi ip mapping
HI-IP Mapping

A.DNS only

B.DNS with RVS

hip mid session mobility
HIP - Mid-session mobility
  • Send the UPDATE package with REA (Readdress) parameter to the other nodes and its RVS
  • Critical scenarios
    • Double jump problem
    • IP address changes during the 4-way handshakes
    • Solved by involving RVS
ship hybrid sip hip
  • Pre-session
    • SIP location server will return the HI address instead of an IP address
    • Until the mapping of the SIP, URI and HI address is changed, no updates are required in the SIP location server
  • Mid-session
    • HIP UPDATE package with REA parameter will be sent to the corresponding host
    • SIP doesn’t need to send re-INVITE message
handoff signaling delay
Handoff Signaling Delay

SIP =140 bytes; HIP = 80 bytes; Mobile IP = 56 bytes

handoff signaling delay cont
Handoff Signaling Delay (cont.)
  • Hybrid SIP-Mobile IP need to use HA to re-direct the packet until the SIP re-INVITE progress is completed
    • Two handoff processes are needed in one handoff
  • Handoff only needs to be processed once in SHIP
handoff signaling overhead cont
Handoff Signaling Overhead (cont.)
  • Overhead of hybrid SIP-Mobile IP scheme will be the sum of the Mobile IP and SIP as two handoff processes are needed
  • SHIP has been shown to outperform than hybrid SIP-Mobile IP
  • This paper has proposed SHIP for future IP based wireless networks
  • SHIP avoids the re-INVITE message in SIP and therefore, its signaling message is smaller
  • SHIP also provides multi-homing support, which does not exist in hybrid SIP-Mobile IP
  • Session Initiation Protocol
    • RFC-3261
  • HIP Working Group (Internet-Draft)
  • Host Identity Protocol - Extended Abstract
    • Ericsson Research, NomadicLab (WWRF8bis)
  • Mobility support in wireless Internet
    • Wireless Communications (IEEE)