IMS Multimedia Telephony service has been standardized in 3GPP as the replacement of the circuit switched telephony service in cellular networks. The multimedia telephony service consists of several service components such as voice, video and text. ‘IMS Multimedia Telephony over Cellular Systems’ provides a comprehensive overview of the service that will enable enriched telephony for mobile users. Enriched telephony fulfils the user’s desire to communicate in new ways, for example by sharing pictures and video clips.
In addition to an overview of the Multimedia Telephony service, the book focuses on the modern media processing methods, which allows the quality of the packet switched voice and video telephony not only to match but also possibly exceed the quality of circuit switched telephony. Such key components as adaptive jitter buffering and adaptation of conversational media are explained in detail.
- Detailed description of how Multimedia Telephony sessions are set-up and controlled
- Analysis showing the capacity and quality of VoIP and Multimedia Telephony in cellular networks
- Coverage of other IMS services such as PoC specified by 3GPP and OMA
- Description of suitable QoS and radio bearers for Multimedia Telephony
- Explanation of the modern radio interface, especially High Speed Packet Access, which is based on concepts such as link adaptation and fast hybrid ARQ
The possibilities for the current and future standards covered in this book make it an indispensable resource for engineers, designers and researchers in VoIP, telecommunication companies and universities teaching and conducting research in telecommunications. It will also be of interest to managers needing an in-depth knowledge of the engineering and key issues of this complex technology, and students aspiring to develop a career in this area.
The innovation of voice communication with electrical means by Alexander Graham Bell initiated the era of Public Switched Telephone Networks (PSTN), and revolutionized the way people in modern civilization would communicate. The important elements of PSTN are fullduplex conversational service, narrowband speech and Circuit Switching (CS). The success of PSTN provided a strong impetus for seeking improvements and modifications to the basic conversational service to provide a richer experience, better convenience and wider availability to the user, in a variety of ways. The evolution of digital signal processing allowed conversion of analog signals to digital format to take advantage of digital communication and switching techniques. The development of the Integrated Service Digital Network (ISDN) provisioned different services, speech telephony, video telephony and data, over the same interface of a single network. Intelligent networking provided enhancement to basic services and cellular systems added the freedom from desktop telephony. Needless to say, these innovations have also been strong stimulants for industrial growth.