15.5 IP Micromobility and Paging


15.5 IP Micromobility and Paging

Recent research [18] in Mobile IP has proposed that IP should take support from the underlying wireless network architecture to achieve good performance for handover and paging protocols. Recent IETF work defines requirements for layer 2 (the data link layer of the OSI model) to support optimized layer 3 (the network layer of the OSI model) handover and paging protocols. Layer 2 can send notification to layer 3 that a certain event has happened or is about to happen. The notification is sent using a trigger. Kempf et al. [19] discuss various ways of implementing triggers. A trigger may be implemented using system calls. The operating system may allow an application thread to register callback for a layer 2 trigger, using system calls of an application-programming interface (API). A system call returns when that particular event is fired in layer 2. Each trigger is defined by three parameters:

  1. The event that causes the trigger to fire

  2. The entity that receives the trigger

  3. The parameters delivered with the trigger

Triggers were defined to aid low-latency hand-over in Mobile IP. [20] Another set of triggers was defined in Gurivireddy and coworkers [21] to aid IP paging protocols. CDMA, for example, works in conjunction with Mobile IP to support mobility in IP hosts. IP paging is a protocol used to determine the location of a dormant (a mode that conserves battery by not performing frequent updates) MN. Paging triggers were defined in Gurivireddy and coworkers [22] to aid movement of a MN in multiple IP subnets in the same layer 2 paging area. Paging triggers aid the MN to enter dormant mode in a graceful manner and make best use of paging provided by underlying wireless architecture.

[18]Sarikaya, B. and Gurivireddy, S., Evaluation of CDMA2000 support for IP micro-mobility handover and paging protocols, IEEE Communications Magazine, May 2002, pp. 146–149.

[19]Kempf, J. et al., Requirements for layer 2 protocols to support optimized handover for IP mobility, IETF draft, July 2001.

[20]Kempf, J. et al., Bidirectional edge tunnel handover for IPv6, IETF draft, Sept. 2001.

[21]Gurivireddy, S., Sarikaya, B., and Krywaniuk, A., Layer-2 aided mobility independent dormant host alerting protocol, IETF draft, Sept. 2001

[22]Gurivireddy, S., Sarikaya, B., and Krywaniuk, A., Layer-2 aided mobility independent dormant host alerting protocol, IETF draft, Sept. 2001




Wireless Internet Handbook. Technologies, Standards and Applications
Wireless Internet Handbook: Technologies, Standards, and Applications (Internet and Communications)
ISBN: 0849315026
EAN: 2147483647
Year: 2003
Pages: 239

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net