Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
a remote CN. When a configurable amount of time has been expired after all remote bindings have been
expired, the dormant state watchdog initiates dormant state transition, notifying the MT dormant state
manager block. However, for demonstration purposes, the dormant state transition is triggered manually
from the NCP and indicated to the paging module through the MTNM and the MT dormant state
manager. This allows dormant registration without waiting for expiration of remote binding entries.
Optionally, automatic dormant state transition might be supported in the dormant state watchdog, based
on timers and remote CNs' binding cache entries' lifetime for the respective MN. Also, in case of mobile
terminal initiated active registration with the network is to be shown, this is also done via the NCP for
demonstration purposes. Optionally, detection of packets to be sent from an application and automatic
active registration initiation might be supported.
4.1.2.6.2 Common ID handler
Independent of L2 identifiers for addressing or paging purposes, the IP paging concept deploys a common
paging identifier, allowing the MT to be identified independent of access technology specifics. A
structure for a common IP paging identifier has been proposed, allowing paging attendants implemented
with ARs to map the generic IP paging request messages to access technology specific addressing and to
build IPv6 Solicited Node Multicast Addresses for individual access technologies and their respective
interface identifiers. On IP level, this common identifier is used to address and to identify mobile
terminals on IP layer. According to the previous specifications, MAC address parts of each interface
implemented in the mobile terminal are included in the common paging ID, which is to be built by the
common ID handler block. To gather information on each interface’s MAC address, the common ID
handler block requests a list of interface addresses from the respective MTNM entity. The derivation of
the common paging ID is to be done on module loading time, assuming that the interfaces do not change
afterwards. An enhanced mechanism could trigger the common ID handler to build a new ID when a new
interface has been brought up in the mobile terminal. To take hot-plugging of networking interfaces into
consideration for future systems, the Common ID handler requests MAC addresses of available access
interfaces each time the mobile enters dormant mode. This allows always for updated and valid MAC
addresses to be incorporated into the common paging identifier. In addition to MAC address info of
implemented access interfaces, the MTNM provides the Common ID handler with information on the
current Access Router, since this information is kept updated in the MTNM.
4.1.2.6.3 MT dormant state manager
The mobile terminal dormant state manager is the high-level entity for maintenance of dormant/active
state as well as for initiation of the signalling procedure for state transition purposes. On receipt of a
notification from the dormant mode watchdog to enter the dormant mode, the dormant state manager
initiates the signalling procedure by contacting the signalling state machine block. After the Paging Agent
discovery phase and the dormant registration procedure have been initiated, an intermediate state should
be entered, indicating that the mobile is going to enter a dormant mode. Active or passive session
initiation while being in this intermediate state would cause immediate re -establishment of active state
behaviour. When the dormant registration has completed successfully, active session initiation would
cause initiation of the normal dormant de-registration procedure. Incoming packets can reach a dormant
mobile terminal, which has entered dormant state before, only after a successful paging and deregistration
procedure, including re -establishment of system information.
Furthermore, this block should store information on the discovered Paging Agent address.
4.1.2.6.4 Signalling state machine
The signalling state machine block has the responsibility to handle the PA discovery and the registration
procedure, therefore representing an abstraction layer between the dormant state manager and the actual
signalling procedure. High granularity states should be maintained within this block. To initiate the
signalling procedure for dormant mode registration, the respective notification comes always from the
‘high-level’ dormant state manager. In case of having entered the dormant mode before, an incoming
paging request is directly to be processed from the signalling state machine, common paging ID matching
is to be checked with the common paging ID block and high-level actions are to be requested from the
dormant state manager.
4.1.2.7 Registration Module
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