Evaluating the GPRS Radio Interface for Different Quality of Service...
Figure 8 i ves iga es he impac of he maximum umber of GPRS user per cell o he performa ce of GPRS for he dy amic cha el alloca io scheme wi h 1 PDCH reserved. Of course, he expec ed umber of GPRS users should be less ha he maximum umber i order o avoid he rejec io of ew GPRS sessio s. O he o her ha d, he maximum umber of ac ive GPRS sessio s mus be limi ed for guara eei g quali y of service for every ac ive GPRS sessio eve u der high raffic. he radeoff be wee i creasi g performa ce for allowi g more ac ive GPRS sessio s a d he i creasi g blocki g probabili y for GPRS users is illus ra ed by he curves of Figure 8. Co clusio s his paper prese ed a discre e-eve simula or o he IP level for he Ge eral Packe Radio Service (GPRS). Wi h he simula or, we provided a comprehe sive performa ce s udy of he radio resource shari g by circui swi ched GSM co ec io s a d packe swi ched GPRS sessio s u der a s a ic a d a dy amic cha el alloca io scheme. I he dy amic scheme we assumed a reserved umber of physical cha els perma e ly alloca ed o GPRS a d he remai i g cha els o be o -dema d cha els ha ca be used by GSM voice service a d GPRS packe s.
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An activation code for the Teacher' s Resource Centre provides access to extra material, while the presentation kit allows the Student' s Book and Activity Book to be projected on to a screen. The Teacher' s Book contains reduced pages of the Student' s Book and Activity Book and also has lesson plans with clearly marked objectives and competencies.
2110 руб -30% 1477 руб
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Units contain humorous stories told through different genres, which use everyday language as well as catchy songs, chants and raps at the lower levels.
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Laser is now a five-level course, with the addition of two new levels, A1+ and A2, designed to cater to younger exam students, and now covers the entire span of secondary education.
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Show what you can do' game; and instructions as to how to get the most out of the resources from Teacher' s Resource Pack 8 assessment worksheets for each level helps you record children' s progress. Class Audio CDs contain all the listening material for the Student Book, including catchy songs and chants, and engaging stories Access to Premium online resources, including Phonics programme resources Набор из книги для учителя и аудио дисков с аудиозаписями к учебнику. Teacher' s Book contains: clear objectives and an overview of language and vocabulary for each unit; an Ideas Bank; extra activities, including indoor and outdoor activities; a '
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Culture pages in the Student' s Book give students an insight into the English-speaking world. A new testing programme and improved teacher' s notes give more support for teachers.
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Complete with class audio CDs featuring pronunciation practice and a range of international accents.
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Wide variety of interesting activities.
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The Online Workbook allows students to practise language online and on the move and see their progress. The Student' s Resource Centre gives access to additional material such as audio, video, answer key, glossary, phrase banks and worksheets. The Student' s Book Premium Pack contains the Student' s Book and webcode access to online components.
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