Enhanced SIP communication services by context sharing

Görtz, Manuel; Ackermann, Ralf; Steinmetz, Ralf

doi:10.1109/eurmic.2004.1333381

Cited by 5 publications

(2 citation statements)

References 9 publications

(10 reference statements)

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“…Goertz, Ackermann, and Steinmetz proposed to implement context sharing during call setup based on SIP [6]. Their idea was to enable the calling party to acquire the callee's current context in order to decide whether or not to initiate a call.…”

Section: Sip-based Distributionmentioning

confidence: 99%

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SIP-based context distribution

Devlić

2010

SIGCOMM Comput. Commun. Rev.

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Context-aware applications need quickly access to current context information, in order to adapt their behavior before this context changes. To achieve this, the context distribution mechanism has to timely discover context sources that can provide a particular context type, then acquire and distribute context information from these sources to the applications that requested this type of information. This paper reviews the state-of-the-art context distribution mechanisms according to identified requirements, then introduces a resource list-based subscription/notification mechanism for context sharing. This SIP-based mechanism enables subscriptions to a resource list containing URIs of multiple context sources that can provide the same context type and delivery of aggregated notifications containing context updates from each of these sources. Aggregation of context is thought to be important as it reduces the network traffic between entities involved in context distribution. However, it introduces an additional delay due to waiting for context updates and their aggregation. To investigate if this aggregation actually pays off, we measured and compared the time needed by an application to receive context updates after subscribing to a particular resource list (using RLS) versus after subscribing to each of the individual context sources (using SIMPLE) for different numbers of context sources. Our results show that RLS aggregation outperforms the SIMPLE presence mechanism with 3 or more context sources, regardless of their context updates size. Database performance was identified as a major bottleneck during aggregation, hence we used in-memory tables & prepared statements, leading to up to 57% database time improvement, resulting in a reduction of the aggregation time by up to 34%. With this reduction and an increase in context size, we pushed the aggregation payoff threshold closer to 2 context sources.

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Section: Sip-based Distributionmentioning

confidence: 99%

“…Both methods return the user's current context in the body of the 200 OK response message. The benefits and drawbacks of using both of these methods are explained in [6]. SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE) [1] has been proposed as the subscription/notification mechanism.…”

Section: Sip-based Distributionmentioning

confidence: 99%

SIP-based context distribution

Devlić

2010

SIGCOMM Comput. Commun. Rev.

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The Digital Call Assistant: Determine Optimal Time Slots for Calls

Görtz

Ackermann

Steinmetz

2004

Interactive Multimedia and Next Generation Networks

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Experimenting with Mobile Context-Aware SIP-based Multimedia Communications

Karmouch

Nayak

Martin

et al. 2007

2007 First International Global Information Infrastructure Symposium

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Advancements in converged networks, technologies, and IP-based multimedia communications are pushing the boundaries of when, where, and how people are able to communicate. As a negative repercussion, the lack of automatic behavior adaptation in wireless communication services is resulting in decreased levels of privacy, safety, security, and overall quality. Such a repercussion can be rectified through the evolution of information technology towards more aware, proactive, reactive, and generally more intelligent mobile devices. The Session Initiation Protocol (SIP) plays a large role in the development and exploration of this idea. We describe a contextaware SIP-based multimedia communication prototype that aims to enable locations to enforce communication policies on mobile devices and allow mobile devices to automatically adapt and negotiate the attributes of a communication session with other communication devices 'on the fly', both pre-session and midsession. Through experimentation we strive to identify the feasibility of such a system and discuss the practical considerations involved.

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Enhanced SIP communication services by context sharing

Cited by 5 publications

References 9 publications

SIP-based context distribution

SIP-based context distribution

The Digital Call Assistant: Determine Optimal Time Slots for Calls

Experimenting with Mobile Context-Aware SIP-based Multimedia Communications

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