Service and system enhancements for TDMA digital cellular systems

Austin, M.D.; Buckley, Annette; Coursey, Cameron; Hartman, P.; Kobylinski, R.; Majmundar, Milap; Raith, K.; Seymour, James P.

doi:10.1109/98.772975

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…2G, was first developed in the 1980s with the main purpose of providing voice calls to mobile users [30], [31]. GSM adopted the same well-consolidated solutions to manage voice calls over fixed telephone network, i.e., circuit-switched digital communications, for an easy compatibility between fixed and mobile networks [32]. [34], [35].…”

Section: A From Phone Calls In 2g To Mobile Data In 3gmentioning

confidence: 99%

Softwarization and virtualization in 5G mobile networks: Benefits, trends and challenges

Condoluci

Mahmoodi

2018

Computer Networks

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The promise behind the effective deployment of 5G networks is an architecture able to provide flexibility, reconfigurability and programmability in order to support, with fine granularity, a wide and heterogeneous set of 5G use cases. This dictates a radical change in the design of mobile systems which, being usually based on the use of static deployment of vendor equipment characterized by monolithic functionality deployed at specific network locations, fail in providing the above mentioned features. By decoupling network functionalities from the underlying hardware, softwarization and virtualization are two disruptive paradigms considered to be at the basis of the design process of 5G networks. This paper analyses and summarizes the role of these two paradigms in enhancing the network architecture and functionalities of mobile systems. With this aim, we analyze several 5G application scenarios in order to derive and classify the requirements to be taken into account in the design process of 5G network.We provide an overview on the recent advances by standardization bodies in considering the role of softwarization and virtualization in the next-to-come mobile systems. We also survey the proposals in literature by underlining the recent proposals exploiting softwarization and virtualization for the network design and functionality implementation of 5G networks. Finally, we conclude the paper by suggesting a set of research challenges to be investigated.

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Section: A From Phone Calls In 2g To Mobile Data In 3gmentioning

confidence: 99%

Softwarization and virtualization in 5G mobile networks: Benefits, trends and challenges

Condoluci

Mahmoodi

2018

Computer Networks

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“…Therefore, and . The likelihood function is given by (10) where is the total number of trials and . In this work, listeners 6 speech sentences 54.…”

Section: Appendixmentioning

confidence: 99%

Improving the transcoding capability of speech coders

Kang

Kim

Cox

2003

IEEE Trans. Multimedia

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With the trend of merging various communication networks, a need arises to provide transcoding between different speech coding formats. Presently this means cross tandeming the two coders in each case. This results in both quality loss and extra delay. A possible alternative is using a bitstream mapping approach that directly converts parameter values. For several standard coders having a similar coding structure, it should be possible to generate comparable or better quality without adding much delay or complexity. This paper proposes a bitstream mapping method between ITU-T Recommendation G.729 and TIA IS-641. Informal listening tests and the perceptual subjective quality measure (PSQM) scores show that the proposed method has better quality than the cross tandeming method, while it has at least 5 ms less delay and six times less computation.

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“…These systems extend the capabilities of existing services and systems to provide an orderly and planned transition into broad-band wireless. Examples include EDGE [Enhanced Data Rates for Global System for Mobile (GSM) Evolution] [1], [2], UWC-136 [3]- [5], [8], and CDMA2000 [6], [7]. EDGE is a high-data-rate extension of GSM.…”

Section: A Evolution Of Second-generation Cellular Systems To Highermentioning

confidence: 99%

“…By using eightlevel phase shift keying (8-PSK) in 200-kHz carriers and advanced link quality control schemes, EDGE is capable of providing data rates in excess of 384 kp/s in outdoor vehicular environments [1], [2]. On the other hand, UWC-136 has been adopted by the Universal Wireless Communications Consortium (UWCC) for evolving the Telecommunications Industry Association (TIA) Interim Standard 136 (IS-136) time-division multiple-access (TDMA)-based technology [3]- [5], and is capable of providing data rates up to 384 kb/s and 2 Mb/s in the outdoor and indoor environments, respectively. CDMA2000 is an evolution from the TIA IS-95 code-division multiple-access (CDMA) standard, and supports data rates up to 2 Mb/s [6], [7].…”

Section: A Evolution Of Second-generation Cellular Systems To Highermentioning

confidence: 99%

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Voice access of global information for broad-band wireless: technologies of today and challenges of tomorrow

Lee

2001

Proc. IEEE

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The rapid development of the Internet and the World Wide Web has created a global network that will soon become a physical embodiment of the entire human knowledge and a complete integration of the global information activities. The traditional approach to access the network is through a computer physically tied to the network. As broad-band wireless takes off, the traditional tethered approach will gradually become obsolete. It is believed that one of the most natural and user-friendly approaches for accessing the network will be via human voice, and the integration of spoke language processing technologies with broad-band wireless technologies will be a key to the evolution of a broad-band wireless information community. This paper offers a vision of the above concept. Technical considerations and some typical example applications of accessing the information and services using voice in a broad-band wireless environment are discussed. Fundamentals of spoken language processing technologies that are crucial in such a broad-band wireless environment are briefly reviewed. Technical challenges caused by the unique nature of wireless mobile communications are also presented along with some possible solutions.

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Service and system enhancements for TDMA digital cellular systems

Cited by 9 publications

References 5 publications

Softwarization and virtualization in 5G mobile networks: Benefits, trends and challenges

Softwarization and virtualization in 5G mobile networks: Benefits, trends and challenges

Improving the transcoding capability of speech coders

Voice access of global information for broad-band wireless: technologies of today and challenges of tomorrow

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