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have several connections with each having its own QoS characteristics 80216 defines four kinds of QoS:
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UGS (Unsolicited Grant Service) Supports constant bit-rate services such as T1 emulation and VoIP without silence suppression rtPS (Real-Time Polling Service) Provides irregularly timed variable-sized packets for MPEG and VoIP with silence suppression nrtPS (Non-real-time Polling Service) Supports consistent variable-sized packets for services such as FTP BE (Best Effort Service) Supports low-priority applications
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There is no uniform global licensed spectrum for WiMAX, although the WiMAX Forum has published three licensed spectrum profiles, ie, 23 GHz, 25 GHz, and 35 GHz Since November 2007, the Radiocommunication Sector of the International Telecommunication Union (ITU-R) has decided to include WiMAX technology in the IMT2000 set of standards, enabling spectrum owners (specifically in the 25 269 GHz band at this stage) to use Mobile WiMAX equipment in any country that recognizes the IMT-2000 (ITU-R Recommendation M1457)
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LTE (Long Time Evolution of UTRAN) is a mobile technology upgrade project for 3G networks initiated in 2004 to provide faster data speeds and new services through new radio access technology optimized for IP-based traffic LTE is part of the GSM evolutionary path beyond 3G, following EDGE, UMTS/W-CDMA, and HSPA UTRAN stands for Universal Terrestrial Radio Access Network Performance targets included the average downlink user throughput of 100 Mbps (3X-4X Release 6 HSDPA levels) and 50 Mbps average uplink throughput (2X-3X HSUPA levels) The LTE architecture is called EPS (Evolved Packet System), and includes E-UTRAN (Evolved UTRAN) for access and EPC (Evolved Packet Core) in the core LTE will be extremely flexible, using a number of defined channel bandwidths between 125 and 20 MHz LTE downlinks use orthogonal frequency division multiple access (OFDMA) to achieve high peak data rates in the high spectrum bandwidth and support data modulation schemes QPSK, 16QAM, and 64QAM LTE uplinks use SC-FDMA (single carrier-frequency division multiple access) and support BPSK, QPSK, 8PSK, and 16QAM modulation, while E-UTRA defines the radio interface To suit as many frequency band allocation arrangements as possible, both paired (FDD) and unpaired (TDD) band operation is supported
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LTE can co-exist with earlier 3GPP radio technologies, even in adjacent channels, and calls can be handed over to and from all 3GPP s previous radio access technologies The first LTE standards were approved by the 3GPP in January 2008, to be included in 3GPP Release 8 Although some operators are planning to deploy their first LTE networks in 2010, most LTE deployment is not expected to begin until 2011 or even later LTE systems will coexist with 2G/3G systems including GSM, EDGE, and UMTS Multimode devices will likely function across LTE/3G or even LTE/3G/2G, depending on market circumstances There is useful and updated LTE information on the 3GPP website (www3gpporg, accessed September 11, 2009) 26 Basics of Digital Communications Systems
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Communications systems can be designed as bandwidth efficient, power efficient, or cost efficient, but not all at the same time Some tradeoffs must be considered in digital RF communications design Power efficiency describes the ability of the system to reliably send information at the lowest practical power level For example, designers of hand-held cellular phones put a high priority on power efficiency because these phones need to run on a battery Cost is also a high priority because cellular phones must be low-cost to encourage more users Bandwidth efficiency describes the ability of a modulation scheme to accommodate data within a limited (as small as possible) bandwidth For designers of digital terrestrial microwave radios, their highest priority is good bandwidth efficiency with low BER (bit-error-rate) Microwave radios have plenty of power available and are not typically concerned with power efficiency They are not especially concerned with receiver cost or complexity because they do not have to build and sell a huge number of units As you have already seen in this chapter, spectrum is a very expensive and highly controlled commodity and therefore bandwidth efficiency is very important
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