SATNAC 2008 Conference Papers
The Intelligent IP Edge
Title: Reliable
Communication Across Ad Hoc Networks
Authors: Francois
Daniels (University of the
Abstract: This
paper presents a fully decentralised peer-to-peer voice communication tool
intended for use across mobile ad hoc networks (MANET) by mobile distributed
groups who desired collaboration. We examined the synergy between MANETs and
peer-to-peer virtual overlay networks which allowed the creation of ad hoc
applications. One style of communication considered suitable for task oriented
distributed group collaboration is push-to-talk. This research was focused on
providing a push-to-talk communication platform suitable for deployment across
MANETs. The research methodology employed was a proof of concept approach
within a classical experimental computer science paradigm. We have developed a
prototype which used JXTA, a peer-to-peer virtual overlay network, to provide
push-to-talk functionality across MANETs. Guaranteed delivery of messages was
provided via a peer-to-peer voicemail delivery system. While the system did
what intended we show that JXTA had a problem with the efficient delivery of
voice samples.
Title: Aggregation Efficacy
of Resource List Servers in IMS Presence Services
Authors: Michael
Pitman (
Abstract: The IP
Multimedia Subsystem (IMS) is the Internet Protocol-based Service-provisioning
framework for mobile and fixed-line convergence, as specified by the Third
Generation Partnership Project (3GPP). The provision of novel applications and
services to subscribers is an important growth area for telecoms providers in
an age of connection commoditisation. Presence is an important growth service
in IMS and is likely to become both an important stand-alone service, and plug
incomponent for other applications. The aspect of the presence architecture
examined here, Resource List Servers, forms part of the presence framework,
improving the bandwidth use for constrained wireless links. This paper covers
the presence architecture and signalling in the IMS, before examining the operation
of a Resource List Server. The operational states of the RLS are examined, and
different methods for aggregation are discussed. Results of simulated
aggregation are presented and discussed.
Title: Bridging the Gap
between peer-to-peer and Conventional SIP Networks
Authors: Mosiuoa
Tsietsi (
Abstract: The Peer-to-Peer SIP (P2P SIP) protocol, which is still being standardised in the IETF, holds much promise for enabling many diverse forms of realtime multimedia communications in completely, or partially, decentralised environments. The final specification will likely feature a distributed storage API for manipulating records belonging to the SIP overlay network, as well as a multi-protocol routing layer. Though great pains have been taken to add support for different types of peer-to-peer platforms in order to realise a truly protocol-agnostic architecture, significantly less effort has been invested in resolving the issue of how these networks will interoperate, if at all, with conventional SIP networks. This paper describes the precise nature of the problem of interoperation among these different types of networks, and presents a solution which is based on dynamic updates in DNS. The solution is described within the context of the P2P SIP architecture called OverCord, and describes how this architecture was extended to support this type of interoperation.