نتایج جستجو برای: utran

تعداد نتایج: 89  

Journal: :IEEE Personal Commun. 2000
Martin Haardt Werner Mohr

mobile subscribers has increased much faster than anticipated. This trend is expected to continue in the future. According to the Universal Mobile Telecommunication System (UMTS) Forum [1], there will be around 400 million mobile subscribers worldwide in the year 2000 and almost 1800 million subscribers in the year 2010. In recent years, the number of subscribers to analog firstgeneration mobil...

Journal: :Wireless Personal Communications 2005
Apostolis K. Salkintzis Fotini-Niovi Pavlidou Frank H. P. Fitzek Vijay K. Varma

The evolution and successful deployment of Wireless Local Area Networks (WLANs) and Wireless Personal Area Networks (WPANs) worldwide has paved the way to more intense standardization and R&D activities, that target even more sophisticated and advanced WLAN/ WPAN systems. Standardization activities within the IEEE 802.11 working group are well underway for evolving the dominant WLAN standard in...

2009
Markus Laner Markus Rupp Philipp Svoboda

In modern 3 Generation (3G) networks such as Universal Mobile Telecommunication System (UMTS) Wide-band Code Division Multiple Access (WCDMA) is used for communication radio links. Power control is a very important issue in WCDMA, it reduces interference and power consumption of the transmission and therefore it needs to be addressed in relation with throughput maximization. Due to this fact UM...

چکیده: در بحث مدیریت منابع رادیوئی نسل­های مختلف شبکه‌های سلولی، عملکرد تلفن همراه در وضعیت بیکار و چگونگی انجام فرایند­های انتخاب سلول و انتخاب مجدد سلول اهمیت دارد. در این مقاله بر اساس آخرین استانداردهای 3GPP و به‌صورت کاربردی پارامترهای مؤثر در انتخاب سلول و انتخاب مجدد سلول در محدوده شبکه‌های سلولی نسل دوم تا چهارم و نواحی همپوشانی آن­ها مورد بررسی قرار می­گیرند. سپس عملکرد تلفن همراه در م...

2011
Evangelos Rekkas Filippo Tosato Woon Hau Chin Eli De Poorter Opher Yaron

This deliverable brings forward how cooperation between network nodes and elements can be used for energy-aware cooperative decision and control. It builds on the cooperation enablers which were studied in D3.1 and presents system models which will be used in future research. Along with these models, mechanisms for energy-efficient cooperative designs are presented. COoperative aNd Self growing...

Journal: :IJDST 2012
Ioan Sorin Comsa Mehmet Aydin Sijing Zhang Pierre Kuonen Jean-Frédéric Wagen

The use of the intelligent packet scheduling process is absolutely necessary in order to make the radio resources usage more efficient in recent high-bit-rate demanding radio access technologies such as Long Term Evolution (LTE). Packet scheduling procedure works with various dispatching rules with different behaviors. In the literature, the scheduling disciplines are applied for the entire tra...

2011
Sonia Jazmín Ponce Rojas Sergio Vidal Beltrán José Iván Zamudio Castro Mariana A. Eslava Gutierrez

This paper examines theoretical and experimental performance of a node B, based on the key quality parameters considered for design, planning and network optimization. Such as power levels of the ratio of chip energy to interference Ec/Io, Received Signal Code Power (RSCP). Also consider the commitment that exists between coverage and quality with an intelligent network of WCDMA. INTRODUCTION W...

2005
Gerhard Wunder Chan Zhou Stephen Kaminski

We devise our concept of OFDM HSDPA interface for UMTS downlink and consider channel aware transmission from base station to multiple users in a single cell using feedback reports. We provide strategies to cope with the necessary control information in upand downlink. We verify our concept with simulations that show the potential of our scheme. I. OVERVIEW UMTS EVOLUTION There are currently sig...

Journal: :Annales UMCS, Informatica 2011
Lukasz Kucharzewski Zbigniew Kotulski

Heterogeneous wireless networks increasingly encroach on our lives. Various technologies and mobile applications more often than usual are now used by mobile users. Intensive development of mobile networks not only sets new standards for radio, but increasingly focuses on providing security for traffic transmitted in wireless networks. Security in wireless networks has never been the primary ob...

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