Dormant Mode Host Alerting ("IP Paging") Problem Statement
RFC 3132
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RFC - Informational
(June 2001; No errata)
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James Kempf
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Last updated |
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2013-03-02
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IETF
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RFC 3132 (Informational)
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Network Working Group J. Kempf
Request for Comments: 3132 Sun Microsystems
Category: Informational June 2001
Dormant Mode Host Alerting ("IP Paging") Problem Statement
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This memo describes paging, assesses the need for IP paging, and
presents a list of recommendations for Seamoby charter items
regarding work on paging. The results are specifically directed
toward the task undertaken by the design team, and are not meant to
be the definitive word on paging for all time, nor to be binding on
Seamoby or other working groups, should the situation with regard to
IP mobility protocols or radio link support undergo a major change.
1.0 Introduction
The IESG has requested that the Seamoby Working Group develop a
problem statement about the need for additional protocol work to
support alerting of dormant mode mobile hosts, commonly known as IP
paging, for seamless IP mobility. The paging design team interpreted
this as direction to examine whether location of a mobile node in
power saving mode can be supported by the existing Mobile IPv4 and
Mobile IPv6 protocols given existing radio link protocols.
Many existing radio link protocols and mobile systems support
location of and radio link establishment with mobile nodes that are
in power saving mode and hence are not actively listening for
delivery of IP packets all the time or are not listening on the radio
channels normally associated with delivering IP traffic to mobile
nodes. This alerting functionality allows mobile nodes to reduce
power consumption and decreases signaling load on the network for
tracking mobiles that are not actively participating in IP packet
generation or reception.
Kempf Informational [Page 1]
RFC 3132 Dormant Mode Host Alerting Problem Statement June 2001
When a mobile is in low power consumption mode, special steps need to
be taken to locate the mobile and alert it. These steps differ
depending on the radio link, but the generic name for this process is
paging, a term that is commonly used in cellular telephony.
In this document, after some initial definitions and material related
to more clearly explaining what paging is, we assess the need for
paging in existing IP mobility protocols (namely Mobile IP [1] [2]).
We then develop a list of work items for the Seamoby working group
related to this need. Note that the discussion in this document and
the conclusions regarding work items are directed toward existing IP
mobility protocols and existing radio link protocols. Should a major
change occur in radio link support or the available IP mobility
protocols, such as the introduction of a micromobility protocol for
IP, the issues examined in this document may need to be revisited.
2.0 Definitions
The following definitions are relevant with respect to clarifying the
paging functionality:
Dormant Mode - A state in which the mobile restricts its ability
to receive normal IP traffic by reducing monitoring of radio
channels. This allows the mobile to save power and reduces
signaling load on the network.
Time-slotted Dormant Mode - A dormant mode implementation in which
the mobile alternates between periods of not listening for any
radio traffic and listening for traffic. Time-slotted dormant
mode implementations are typically synchronized with the network
so the network can deliver traffic to the mobile during listening
periods. Additionally, the mobile may be restricted to listening
on specific signaling channels that, according to current
practice, are not typically used to carry IP traffic.
Paging - As a consequence of a mobile-bound packet destined for a
mobile currently in dormant mode, signaling by the network through
radio access points directed to locating the mobile and alerting
it to establish a last hop connection. This messaging is in
addition to simply delivering the packet to the mobile, i.e., last
hop routing of packets is NOT considered to be paging.
Paging Area - Collection of radio access points that are signaled
to locate a dormant mode mobile node. A paging area does not
necessarily correspond to an IP subnet. A dormant mode mobile
node may be required to signal to the network when it crosses a
paging area boundary, in order that the network can maintain a
rough idea of where the mobile is located.
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