Xem 1-6 trên 6 kết quả Umts interfaces
  • 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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  • 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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  • Security was perceived by some in the first days of GSM as an unnecessary expense. Certainly, initially, all involved considered protection of user data from eavesdropping as more important than authentication of the user, though some questioned whether the perceived complexity of introducing encryption over the radio interface was justified.

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  • A PLMN can be regarded as an independent telecommunications entity. ▪ A PLMN is defined as: ▫ One or more switches with: ▫ Switches act as the interface to ▪ a common numbering plan ▪ a common routing plan external networks ▪ The PLMN can be separated into ▫ Core Network ▫ Access Network

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  • Having dealt with in-depth analysis of SS#7, GSM and GPRS networks I started to monitor UTRAN interfaces approximately four years ago. Monitoring interfaces means decoding the data captured on the links and analysing how the different data segments and messages are related to each other. In general I wanted to trace all messages belonging to a single call to prove if the network elements and protocol entities involved worked fine or if there had been failures or if any kind of suspicious events had influenced the normal call proceeding or the call’s quality of service.

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  • TOWARDS ‘ALL IP’ AND SOME CONCLUDING REMARKS This concluding chapter provides first an introduction to some of the planned release 5 enhancements to UMTS and the GPRS/EDGE RAN (GERAN). These can be seen as the first step towards ‘all IP’. The challenges when having to deliver real-time IP services over an air interface, in particular voice over IP services, are summarised and possible solutions to achieve spectrum efficiencies similar to those of optimised cellular voice services are outlined.

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