Xem 1-8 trên 8 kết quả Umts basics
  • UMTS is real. In a continuously growing number of countries we can walk in the stores of mobile network operators or resellers and take UMTS PC cards or even third-generation (3G) phones home and use them instantly. Every day the number of equipments and their feature sets gets broader. The “dream” of multimedia on mobile connections, online gaming, video conferencing, real-time video or even mobile TV becomes reality. With rapid technical innovation the mobile telecommunication sector has continued to grow and evolve strongly....

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  • 1 Introduction to the Content of the Book This book describes how global mobile communication was made. It is written for those who want or need to know how this was achieved e.g.

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  • The Detailed Specification Work Leading to the GSM Phase 1 Standard used for the Opening of Service (1987–1991) Thomas Haug 1 Mid-1987 was a milestone in the work of GSM. I think everybody in the group felt, despite what they might have felt earlier, that the agreement on the basic parameters in the air interface marked the turning point in the work. Another very important event took place in 1987 after years of preparations, i.e. the Memorandum of Understanding (MoU), signed by – initially – 14 operators who made a firm commitment to implement the system by 1991....

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  • Introduction Harri Holma and Antti Toskala Mobile Voice Subscriber Growth Mobile Data Usage Growth Wireline Technologies Evolution Motivation and Targets for LTE Overview of LTE 3GPP Family of Technologies Wireless Spectrum New Spectrum Identified by WRC-07 LTE-Advanced LTE Standardization Antti Toskala Introduction Overview of 3GPP Releases and Process LTE Targets LTE Standardization Phases Evolution Beyond Release 8 LTE-Advanced for IMT-Advanced LTE Specifications and 3GPP Structure References System Architecture Based on 3GPP SAE Atte Länsisalmi and Antti Toskala System Architecture E...

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  • Physical communication channels in wireless technology are inherently insecure. As a wire only has two ends, the wired communication technology has a means of supporting integrity of communication, whereas in wireless communication dedicated technology is needed—even to control a basic point-to-point connection.

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  • UMTS standard: WCDMA/FDD Layer 1 17.1 TRANSPORT CHANNELS AND PHYSICAL CHANNELS (FDD) 17.1.1 Transport channels In the terminology used in wireless communications, ‘transport channels’ are the services offered by Layer 1 to the higher layers. The purpose of this section is to introduce basic terminology and abbreviations used in practice. For more details, see www.3gpp.org. We start with the definition of the channels.

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  • THE UMTS DEVELOPMENT PLATFORM ARCHITECTURE AND DEPLOYMENT SCENARIOS The architecture at the domain and functional levels, as well as the deployment scenarios are presented based on the 3GPP (ETSI) specifications noted in [1,2]. The terminology and basic principles are kept for consistency with a simplified approach in some cases, and for a pragmatic representation of the subject in others.

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  • PACKET ACCESS IN UTRA FDD AND UTRA TDD In this chapter, first a brief introduction to UMTS Terrestrial Radio Access (UTRA) matters is provided, such as fundamental radio access network concepts, basics of, for example, the physical and the MAC layer, and the types of channels defined (namely logical, transport and physical channels). This is followed by a discussion of certain UTRA FDD features, such as soft handover, fast power control and compressed mode operation.

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