SIP-Based Vertical Handoff Between WWANs and WLANs 1 WLAN-UMTS - - PowerPoint PPT Presentation

sip based vertical handoff between wwans and wlans
SMART_READER_LITE
LIVE PREVIEW

SIP-Based Vertical Handoff Between WWANs and WLANs 1 WLAN-UMTS - - PowerPoint PPT Presentation

SIP-Based Vertical Handoff Between WWANs and WLANs 1 WLAN-UMTS Interworking Architecture Loosely coupled integration architecture WWANs and WLANs are connected through the Internet, and each is an independent IP wireless access domain.


slide-1
SLIDE 1

1

SIP-Based Vertical Handoff Between WWANs and WLANs

slide-2
SLIDE 2

2

WLAN-UMTS Interworking Architecture

  • Loosely coupled integration architecture
  • WWANs and WLANs are connected through the

Internet, and each is an independent IP wireless access domain.

  • Tightly coupled integration architecture
  • WLANs are incorporated into WWANs as part of its

radio access subsystem.

slide-3
SLIDE 3

3

slide-4
SLIDE 4

4

SIP Terminal Mobility

  • Pre-call mobility
  • Re-registers its new IP address with its “home” by

sending a REGISTER message

  • Mid-call mobility
  • Sends an INVITE message about the terminal’s new IP

address and updated session parameters

slide-5
SLIDE 5

5

WLAN-to-UMTS Vertical Handoff

slide-6
SLIDE 6

6

UMTS-to-WLAN Vertical Handoff

slide-7
SLIDE 7

7

Analysis of Handoff Delay

  • There are two types of delays associated with the

handoff process

  • Wireless component delay: the delay introduced by the

error-prone wireless links in the UMTS and WLAN access networks for the correct transmission of the associated handoff messages

  • Processing delay: the queueing delay due to the load in

the computing entities, such as the CSCF servers, SIP servers, and even the mobile host in the signaling path

slide-8
SLIDE 8

8

Analysis of Handoff Delay

  • Let the handoff delay during mid-call terminal

mobility be DHandoff , which can be divided into

  • The delay during the attachment procedures
  • The delay due to location update using the SIP INVITE

message.

  • For handoff to UMTS networks,
  • For handoff to WLAN
slide-9
SLIDE 9

9

Analysis of Handoff Delay

  • DSIP-UMTS and DSIP-WLAN are the transmission delays
  • f SIP location update
slide-10
SLIDE 10

10

Analysis of Handoff Delay

slide-11
SLIDE 11

11

Analysis of Handoff Delay