Problem Statement
The plurality of the communications networks and the emphasis on services frame the problem addressed by this book. Put succinctly, the problem is how best to foster service accessibility of existing services across different networks and how best to foster service innovation by 1 In existing literature, the terms cellular and wireless are used synonymously to refer to the cellular PSTN however, with the advent of the wireless Internet in the form of the IEEE 802.11 wireless network or wireless...
Conclusions
Over the course of their respective lifespan, the public switched telephone network PSTN and the Internet have evolved in divergent ways. The PSTN has been characterized by centralized control of network resources where the intelligence required to process the information resides in the core of the network. The Internet espoused a view that was completely opposite. The network itself was simply considered a transport to move information in the form of bits toward the edges, where more powerful...
Acronyms
Event Detection Point Notification Event Detection Point Request International Mobile Subscriber Identity Intelligent Network Application Protocol International Telecommunications Union Multipurpose Internet Mail Extensions Mobile Station or Mobile Subscriber Services in the PSTN IN Requesting InTernet Services Trigger Detection Point Notification Trigger Detection Point Request
Masking Uneven Conditions
The rate of penetration of pervasive computing technology will vary considerably. The capabilities of entities that provide services to users invisibly will vary considerably. One way to reduce the amount of variation observed by users is to have their computing space compensate for dumb environments in essence, provide a canonical representation of their computing space and ensure that a service, if it is operating in a nonfriendly environment, at least tunes its behavior to fit the...
Design of the EM
The EM is a critical piece in our architecture. All events published in the system by multiple event sources arrive at the EM, where they are mediated. Mediation consists of running a selection process on the event to determine if a consumer is interested in receiving a notification of that class of event. If so, the EM constructs a SIP notification request and dispatches it toward the consumer in a secure fashion. If the selection process did not result in an interested consumer, the event is...
Mapping SIP Protocol State Machine to OBCSM
The 11 PICs of O_BCSM come into play when a call request SIP INVITE message arrives from an upstream SIP client to an originating SIN-enabled SIP entity running the IN call model. This entity will create an O_BCSM object and initialize it in the O_NULL PIC. The next seven IN PICs O_NULL, AUTH_ORIG_ATT, COLLECT_INFO, ANALYZE_INFO, SELECT_ROUTE, AUTH_CALL_SETUP, and CALL_SENT can all be mapped to the SIP Calling state. Figure 5 provides a visual map from the SIP protocol state machine to the...
CMMSS Considerations
When interworking between Internet telephony and PSTN IN networks, the main issue is to translate between the states produced by the Internet telephony signaling and those used in traditional IN environments. Such a translation entails attention to the considerations listed below. In Service Platforms SCP, SN, AD, IN Basic Call State Machines and Transitions Approximates a Traditional Swith IN Basic Call State Machines and Transitions Approximates a Traditional Swith 5.4.1.1 The Concept of a...
Service Architecture for Traditional Telephone Network
The service architecture for the traditional telephone network wireline and wireless is defined around the Intelligent Network IN FAY96 . IN is a conceptual architecture that separates the call control from the service execution. Figure 2.1 shows a simplified IN architecture. In reality, there are more IN entities than depicted in Figure 2.1, but for our discussion, the ones depicted in the figure suffice. Subscribers use telephonic devices that are connected to a telephone switch called the...
Localized Scalability
Scalability is a critical problem in pervasive computing. Depending on the specifics of the smart space implemented, the intensity of interaction among cooperating entities may increase. Although this may be acceptable for a smart space that is confined to a small area, it is prohibitive for one that spans geographical distances. The problem is further compounded if one or more of the cooperating entities are mobile and thus may be limited by the bandwidth, energy, and computing power. In...
Conclusion Lfi
We have implemented PSTN-originated crossover services for the wireline GUR03a and cellular GUR04d, GUR05a components of the PSTN. Our implementation will be discussed in detail in the next chapter, where we will highlight its applicability to ongoing research in the area of pervasive computing. It is important to note that the ontology we have described is not limited to PSTN events culled from the BCSM. The methodology presented here is independent of any call model just an agreement is...
List of Abbreviations and Symbols
Data enhanced Second Generation network Third Generation Partnership Project Call Model Mapping with State Sharing Common Object Request Broker Architecture CTI Computer Telephony Integration GPS Geographical Positioning System HTTP Hypertext Transfer Protocol IANA Internet Assigned Numbers Authority IETF Internet Engineering Task Force IM Instant Message or Instant Messaging INAP Intelligent Network Application Part IP Internet Protocol, also Intelligent Peripheral ITU International...