Tài liệu Điện thoại di động băng thông rộng không dây P1 docx

... depicts this multi-dimensional and re-configurable radio [1], while Figure 1.6shows its open interfaces. As wireless goes multi-dimensional, different standards come outeveryday for different applications. ... Fuelled by many emerging technologies including digital signal processing,software definable radio, intelligent antennas, superconductor devices as well as digitaltransceiver, the future wireless ... story will be totally different. Why? Because by that time, the wirelessinfrastructure (not just for communications) will be totally multi-dimensional, whether intechnologies (diversified and harmonised),...

Tài liệu Điện thoại di động băng thông rộng không dây P3 docx

... ﬁeld indicates thecommon logical channel type, or if a dedicated logical channel is used.† UE Id Mux: for dedicated type logical channels, the UE Id ﬁeld in the MAC header is usedto distinguish ... (OCCCH): bi-directional channel for transmittingcontrol information between UEs.† ODMA Dedicated Control Channel (ODCCH): a point-to-point bi-directional channelthat transmits dedicated control ... and channelization code for TDD) may bedivided between different access service classes in order to provide different priorities ofRACH usage. In addition it is possible for more than one ASC...

Tài liệu Điện thoại di động băng thông rộng không dây P8 docx

... volumes measured over a 200-m distanceBroadband Wireless Mobile: 3G and Beyond282Figure 5.11 Cumulative distributions of the path losses for different traffic conditions (hb¼ 4m,hm¼1.3 m, ... from the direct wave and the wave reflected off the ground and inco-herent components. As noted by Durgin et al. [25], these additive signals produce a distribu-tion in which deeper fading occurs ... has been reported that these variations will differ depending on the volume oftraffic even in LOS terrain [122]. Figure 5.11 shows the path loss distribution results onRayleigh probability paper...

Tài liệu Điện thoại di động băng thông rộng không dây P2 pptx

... segmentation.UMTS Air Interface 21Table 2.2.2 Coding schemes for transport channels in FDDTransport channel Coding scheme Coding rateConvolutional coding Turbo coding No coding CC TCBCH X ––1/2 –PCH X ––1/2 ... dependent on thechannel coding scheme.The following channel coding schemes can be applied to transport channels:† convolutional coding† turbo coding† no coding.The coding schemes applied are ... next step, coding. The channelcoding deﬁnes a maximum size for the block to be coded (code block), depending on thecoding that would be used. The possibilities are, convolutional coding with a...

Tài liệu Điện thoại di động băng thông rộng không dây P4 pdf

... ofadditional radio channels with different structure, different encoding and different modulationfrom the typical GSM channels. These radio channels provide for increased capacity on theradio interface. ... the radio interface and the management of the radio interface. In particular, the protocolsacross the MT – AN interface support the transfer of detailed radio-related information tocoordinate ... GSM/EDGE Radio Access Network (GERAN)Apart from the legacy GSM radio access network and the UMTS terrestrial radio accessnetwork (see section 3.4), 3GPP Rel-4 supports an evolved GSM radio access...

Tài liệu Điện thoại di động băng thông rộng không dây P5 pptx

... radio multiplexing technology, which deals with the way the radioresources are divided and allocated to several mobile users. However, W-CDMA also speci-ﬁes some aspects related to the radio ... each one possibly based on different RAN technology.3.4.7.2 Independence between the transport network and radio access networkAs indicated in Figure 3.13(a), the radio access network is typically ... uplink direction is not provided because it is assumedthat uplink resources on Gb are suitably dimensioned, and are signiﬁcantly greater than thecorresponding uplink resources on the radio interface....

Tài liệu Điện thoại di động băng thông rộng không dây P6 pdf

... multimedia.4.2.2.5 Next generation of WAPThe next generation of WAP will include:† XHTML† TCP† colour graphics† animation† large ﬁle downloading† location-smart services† streaming media† ... ‘cards’ on the handset display. A very important advantageof WAP is that it aims to provide standardised support for wireless data applications. So eachhandset developed according to the WAP standard ... applications plus telephony-speciﬁc features as well as providingstandardised support for wireless data applications.WAP is also applicable to many different wireless beares and infrastructures (see...

Tài liệu Điện thoại di động băng thông rộng không dây P7 ppt

... networks,automatic service discovery will be a very important feature in future wireless networkscenarios. With service discovery, devices may automatically discover network servicesincluding their properties, ... ingredients, for example a MP3 piece of music can becharged with micropayments assigning revenue directly to the musicians.Emerging Wireless Applications and Protocols 259‘Open Source’ paradigm ... communications have traditionally been divided into manufacturer/operatorproprietary part, and into public interfaces deﬁned in standards. Typically the proprietarypart is where the differentations...

Tài liệu Điện thoại di động băng thông rộng không dây P9 doc

... cellular radio systems.However, designing a teletraffic profile is exceedingly difficult because the teletraffic volumediffers in different regions and districts, and it also varies, depending on ... is important. Code division multiple access (CDMA) is used in IMT-2000. Fortime division multiple access (TDMA), a lot of research on technology to counter fadinghas been studied. It also has ... technologies is difficult, even for experts.Cellular radio systems face some difficulties handling teletraffic, which do not occur inwired-communication services. In cellular radio systems, frequency...

Tài liệu Điện thoại di động băng thông rộng không dây P10 pptx

... when not applying sitediversity, successful reception rate is essentially the same for all regions and fair service canbe provided. Accordingly, the application of site diversity reception generates ... and downlink of cellular radio systems are not coincidentbecause these system structures are different. When traffic is uneven, it influences on commu-nication quality differently for the two types ... [44,75,134]. In multimedia communica-tions, the volume of teletraffic is greatly different in the up and downlink. Therefore,controlling a cell area as DCC affects the links differently. We calculated...

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