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IP-paging architecture

Within the framework of the IST Moby Dick project, a concept for IP-based paging support has been specified, implemented and tested. Based on some functional and non-functional requirements, the paging architecture components as well as protocol messages and parameters have been specified in consideration of the design goals. As a result, an IP paging concept has been specified, which integrates modularly with the Mobile-IPv6 platform without being dependent on it. The concept's framework has been discussed within the Internet Engineering Task Force (IETF) and the Internet Research Task Force (IRTF).

Based on the architecture and protocol concept, protocol message parameters have been specified to allow the integration and operation with the Moby Dick platform and associated access technologies (IEEE802.3, IEEE802.11 and TD-CDMA).

A prototype of the paging components has been implemented, which is based on a dedicated Paging Agent node, paging attendant modules, which are to be integrated with individual Access Routers, and a paging module for the mobile terminal, which interfaces efficiently to the MTNM-module to synchronise with other functions (e.g. registration) and to retrieve access related information.

Since one of the design goals was to integrate the paging architecture modularly without the need to change existing architecture and protocol components, but to make use of existing functions for the integration, the specification included the use of the Mobile-IPv6 protocol's alternate care-of-address (alt-CoA) registration. This registration support is part of the Mobile-IPv6 protocol specification, but was not available in the protocol implementation used in the Moby Dick project (implementation of Helsinki University of Technology). Hence, some parts of the Open Source Mobile-IPv6 implementation have been extended to implement the alt-CoA registration support.

One function of the concept's paging attendants is to allow mapping of the technology independent paging protocol, which is used between the Paging Agent node and individual paging attendants, to technology specific paging on the access links served by individual Access Routers. Since the focus of paging related activities in Moby Dick was on the design of the framework and the common core protocol and less on technology specific paging functions and optimisation, support for integration of the Moby Dick access technologies has been specified for support on IP layer. Mapping to optimised technology specific dormant mode and paging support on access technologies' link-layer is allowed by the concept but is future work. However, efficient mapping and addressing on IP layer has been specified and implemented for IEEE802.3, IEEE802.11 and TD-CDMA. Since TD-CDMA support is integrated with a Radio Gateway, which is physically separated from the respective IP-subnet's associated Access Router, operation between the paging attendant and the Radio Gateway has been specified in a generic way without introducing proprietary protocol messages for control and management purposes. This allows smooth migration to a collocated architecture in the future, which has the Access Router and the TD-CDMA Radio Gateway functions integrated in one physical node representing a TD-CDMA Access Router.

More information on the Moby Dick project can be found at:

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Nec Europe Ltd.
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