... chế độ FDD và TDD.1.2 So sánh côngnghệLTE với côngnghệ Wimax và những triển vọng cho công nghệ LTE 1.2.1 So sánh côngnghệLTE với côngnghệ WimaxVề công nghệ, LTE và WiMax có một số khác ... Minh Tâm40 Đồ án tốt nghiệp CôngnghệLTEchomạngdiđộngbăng rộng CHƯƠNG 1 GIỚI THIỆU VỀ CÔNGNGHỆ VÀ MỤC TIÊU THIẾT KẾ LTE 1.1 Giới thiệu về côngnghệ LTE LTE là thế hệ thứ tư tương lai ... Minh Tâm28 Đồ án tốt nghiệp CôngnghệLTEchomạngdiđộngbăng rộng Hình 1.1 - Kiến trúc của mạng LTE - Độ dài băngthông linh hoạt: có thể hoạt động với các băng 1.25 MHz, 1.6 MHz, 2.5 MHz,...
... đối với công nghiệp Viễn Thôngdi động. Mạng thông tin diđộng thế hệ ba ra đời đã khắc phục được các nhược điểm của các mạngthông tin diđộng thế hệ trước đó. Tuy nhiên, mạngdiđộng này ... tác với 2.4. CÔNGNGHỆ TRÊN IP VÀ IP DIĐỘNG Trong hệ thốngthông tin diđộng 4G thì IP diđộng (MIP: Mobile IP) là một vấn đề rất quan trọng. Vấn đề thách thức đối với IP diđộng là phải ... độ truyền dữ liệu trong mạng 4G 2.2. MÔ HÌNH MẠNG 4G 2.2.1. Ưu nhược điểm của cấu trúc mạng 3G và 3,5G a) Mạng thông tin diđộng thế hệ ba WCDMA Mạng thông tin diđộng thế hệ ba ra đời đã...
... chế độ FDD và TDD.1.2 So sánh côngnghệLTE với côngnghệ Wimax và những triển vọng cho công nghệ LTE 1.2.1 So sánh côngnghệLTE với côngnghệ WimaxVề công nghệ, LTE và WiMax có một số khác ... Minh Tâm44 Đồ án tốt nghiệp CôngnghệLTEchomạngdiđộngbăng rộng CHƯƠNG 1 GIỚI THIỆU VỀ CÔNGNGHỆ VÀ MỤC TIÊU THIẾT KẾ LTE 1.1 Giới thiệu về côngnghệ LTE LTE là thế hệ thứ tư tương lai ... nghiệp CôngnghệLTEchomạngdiđộngbăng rộng động thế hệ thứ tư (4G). Tuy vẫn còn khá mới mẻ nhưng mạngdiđộngbăngrộng 4G đang được kỳ vọng sẽ tạo ra nhiều thay đổi khác biệt so với những mạng...
... 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. ... Basic Input-Output System or CAI-BIOS) will go the wayas the computer industries did in the past. A compact multi-dimensional broadband wirelessmodel will be adopted for the system design and ... one track and generatesthe 4Gmobile. In the following sections, we will discuss some detailed implementation issuesincluding system architecture, reference model, protocol stack as well as system...
... 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 ... with respect to timeslots, radio frames andsystem frame numbering (SFN). Depending on the resource allocation, the configuration ofradio frames or timeslots becomes different. All physical channels ... theinteroperability of UEs of different providers with UTRANs from different telecommunica-tion operators. In particular, this chapter focuses on the radio interface.The radio interface is characterized...
... (OCCCH): bi-directional channel for transmittingcontrol information between UEs.† ODMA Dedicated Control Channel (ODCCH): a point-to-point bi-directional channelthat transmits dedicated control ... 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 ... 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...
... 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. ... PSTN.The IP Multimedia Media Gateway Function (IM-MGW) terminates bearer channelsfrom a switched-circuit network and media streams from a packet network. It typicallysupports media conversion, ... mechanisms for data transcoding to support interworking between entities using differentdata encoding formats.The transport stratum in a 3G system, which aims at supporting multimedia services,should...
... service.† Macro-diversity procedure: Before a mobile is handed over to another radio channel themacro-diversity mode may be activated. In this mode, the mobile is assigned an additionalradio channel, ... simultaneously transmitted on two radio channels. In addition,the downlink information is transmitted to the mobile by two different radio channels. Forthis macro-diversity technique to work, the ... datagram, etc.3.4 UMTS Terrestrial Radio Access NetworkAs discussed before, the UMTS Terrestrial Radio Access Network (UTRAN) [14] is one ofthe several possible radio access networks (RANs) that...
... ‘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 ... multi-mode UI)MultimediaMutimedia services enabled by:† more bandwidth (GPRS, 3G, etc)† Moore’s law and handset evolution† imaging – colour, standard formats, etc.† audio – download clips,...
... 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...
... 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 ... 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, ... propagation channels thus have different frequency response characteristicsthrough which transmitted signals suffer from different delay, amplitude, and phase distor-tions in each channel....
... 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 ... 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 ... 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...
... cell boundary differed according to the expected downlinkorthogonality. If the area control is used in both the up and downlinks, the cell boundaries arenot always coincident, and different BSs ... 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...
... systems practically indistinguishable from future genera-tion systems. Indeed, it is expected that it will be more difficult to identify distinct generationgaps and such a distinction may only ... development of other radiosystems. In conjunction with the future development of 3Gwireless there may be aninterrelationship with other radio systems, for example wireless LANs, digital videobroadcast, ... future development of 3Gwireless and future development of other radiosystems. Present digital cellular systems have evolved by adding more and more systemcapabilities and enhancements to make...