The third edition now covers the key features of 3gpp release 6 ensuring it remains the leading principal resource in this constantly progressing area. Umts combines three different terrestrial air interfaces, gsms mobile application part map core, and the gsm family of speech codecs the air interfaces are called umts terrestrial radio access utra. Wcdma air interface free download as powerpoint presentation. A knowledge of the structure and usage of the physical channels in the downlink and uplink directions, together with a knowledge of spreading and modulation, provides a good background for understanding how the wcdma radio network works. In the currently most popular variant for cellular mobile telephones, wcdma imt direct spread is used.
Jun 17, 2005 the rrm problem for umts is presented, and more specifically, for the fdd mode, which is based on a wcdma scheme. An rnc may connect to several rncs through the iur interface. The wcdma specification has been created in 3gpp the 3 rd generation partnership project, which is the joint standardization project from europe, japan, korea, the usa and china. Understanding the wcdma radio interface is essential for engineers dealing with umts radio networks. The training presents functionality related with the use of r99 dedicated channels, as well as, hspa. One of the main air interface for 3g system is referred as wide band cdma wcdma.
The wcdma technology provides the umts system some of the new functionalities on the air interface. What is umts network architecture radio access radio interface frequency bands umts cdma modulation data channels umts tdd tdsdcdma handover. The same air interface wcdma is to be used in europe and asia including japan and korea using the frequency bands around 2 ghz. Wcdma air interface as well as wcdma the other air interfaces that can be used are edge and cdma2000. Lucent technologies proprietary 1 objectives describe the requirements and drivers behinds the wcdma air. Download lte air interface protocols ebook pdf or read online books in pdf, epub, and mobi format. Wcdma air interface error detection and correction. Wcdma supports aac music, amr speech and mpeg4 and h.
Umts through wcdma can be summarized like a revolution of the air interface accompanied by a revolution in the network of their architecture. Offers many improvements over 2nd generation ncdma systems. It is a complete set of specifications in which a detailed protocol defines how a mobile phone communicates with the base station or nodeb. Asynchronous bs operation fast tpc variable data rate transmission orthogonal multi spreading factors. Wcdma technology has emerged as the most widely adopted third generation air interface.
Sadowsky general dynamics c4 systems 8201 east mcdowell road, md h2171 scottsdale, az 85257 480 441 1534 email protected abstract wcdma is a 3rd generation wireless communication system developed for terrestrial cellular systems. Base stations are referred to as nodeb and control equipment for. The tta1 and tta2 air interface proposals later renamed. Utran umts terrestrial radio access network handles all radio related functionality wcdma is radio interface standard here. Wcdma was adopted as a standard by the itu under the name imt2000 direct spread.
In order to satisfy the future service and application needs several technical enhancements are being studied and standardized for wcdma in 3gpp. In the uncoordinated case it is 3gpp recommended practice that the center. Lucent technologies proprietary 2 objectives describe the requirements and drivers behinds the wcdma air interface. Click download or read online button to lte air interface protocols book pdf for free now. Wcdma air interface course gives the detailed description of the wcdma fdd technology and its use in the umts network. Abstractwe devise our concept of ofdm hsdpa interface for umts downlink and consider channel aware transmission from base station to multiple users in. Fma2 is a singlecarrier wideband cdma solution using a 4. Wideband code division multiple access wcdma providing different signaling rate services with multi code modulation scheme and with effective multiplexing of user data is emerging as one of the important air interface for third generation 3g wireless communication systems. Wcdma air interface fundamentals telecommunications radio.
Comparison between cdma and tdma air interface for. More specifically, the different aspects that are covered include. Concept of an ofdm hsdpa air interface for umts downlink. The training focuses on physical layer operation and procedures and other functions closely related with the physical layer.
Wide band cdma technology is selected for utran air interface. Pdf wcdma system standardization, interfaces and power control. Wcdma power control with the long geosatellite round. The lte air interface physical layer offers data transport services to higher layers.
Wcdma system standardization, interfaces and power control. The iucs, iups, iub, and iur interfaces are implemented on the atm network. The mobile user objective system muos is a geosatellite communications system derived from the terrestrial cellular wcdma air interface. Lucent technologies proprietary 1 wcdma air interface fundamentals prepared by. Radio resource management strategies in umts wiley online books. Gsm europe and large parts of the world, cdmaone americas, damps. Introduces the mobile communications sector and umts, including the evolution towards 4g systems, with an overview of the qos concept which is key for the definition. Short for wideband cdma codedivision multiple access, a 3g technology that increases data transmission rates in gsm systems by using the cdma air interface instead of tdma. Below table shows some of the key parameters of wcdma air interface. The wcdma air interface was initially designed to support a wide variety of services with different qos requirements having a maximum bit rate of 2 mbs. It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher. For other wideband cdma proposals it can be written as w zeon pdf driver trialcdma.
Pdf a framework for umts air interface analysis researchgate. Feasibility study of a wcdma direct airtoground link in. Wcdma wideband code division multiple access wcdma the air radio interface standard for umts wideband direct sequence spread spectrum variable orthogonal spreading for multiple access ovsf three types of interface. The access to these services is through the use of a transport channel via the mac sublayer. In wcdma air interface all users belonging to a cell are separated by codes, this allows the users to transmit in the same frequency and at the same time. The ue accesses the fixed part of the network through the uu interface. The physical layer has interface to both mac and rrc sublayer. As an ofdma technology lte assumes small nominal guard band 10 %, excluding 1. Wideband code division multiple access wcdma is the physical layer used for universal terrestrial radio access utra fdd mode. The operator license can be shared highly efficiently between lte and gsm portions with the rf sharing solution. It is one of the air interface used with umts mobile communication standard which allows communication between ue and node b. The downside to picking wcdma is that it will stop your phone from using 2g networks at all so if youre in an area with no 3g support, then your phone will have no data signal but if youre in an area that you know has good 3g signal, then selecting this will save power. Pdf an integrated approach is presented for uplink and downlink air. Wcdma open loop power control in wcdma attempt to make a rough estimation of path loss by measuring downlink beacon signal problem far too inaccurate fast fading is essentially uncorrelated between uplink and downlink due to large frequency separation of uplink and downlink band of wcdma fdd mode.
This is the electrical interface between the usim smartcard and the me. Download pdf lte air interface protocols free online. Difference between cdma and cdma pdf semantic scholar. The physical layer is expected to perform the following functions in order to provide the data transport service. This is the wcdma radio interface, which is the subject of the main part of this book. Wcdma air interface 102 enlzt 123 7279 r4a radio base station rbs user equipment ue pccpch primary common control physical channel sch synchronization channel pcpich primary common pilot channel common physical channels dpdch dedicated physical data channel dpcch dedicated physical control channel dedicated physical channels pich page indicator. Practical tips on wcdma measurements this is a practical wideband code division multiple access wcdma measurement. The lte air interface is well scalable in terms of bandwidth. Layer 2 consists of medium access control mac radio link control rlc the broadcast multicast control bmc packet data convergence protocol pdcp 3. Lowest layer in this interface is physical layer, phy. By providing a deep understanding of the wcdma air interface, the practical approach of this third. Wcdma is based on cdma and is the technology used in umts. All air interface options are part of itus imt2000.
Instead of assigning specific frequencies or time slots to each user, the systems users are distinguished by assigning codes. Wcdma innerloop power control in wcdma uplink bs performs frequent estimates of the received signaltointerference ratio sir and compares it to a target sir if the measured sir is higher than the target sir, bs will command ms to lower the power if sir is too low, it will command ms to increase its power openloop power control. Every rnc is connected to sgsn through the iups interface, and to an msc through the iucs interface. Wideband code division multiple access, along with umtsfdd, utrafdd, or imt2000 cdma direct spread is an air interface standard found in 3g mobile telecommunications networks. Nokia siemens networks lte 1800 mhz introducing lte with. This radio interface has great capability on which third generation of mobile c. Two kinds of codes are used in wcdma operation, the channelization or spreading codes and the scrambling codes. The protocols used in the air interface, from the viewpoint of the mobile. Highly regarded as the book on the air interface of 3g cellular systems wcdma for umts has again been fully revised and updated.
Recent years have witnessed the rapid progress in handheld devices. April 24, 2001 ece371vv wcdma 19 conclusion wcdma is the air interface standard proposed by arib and etsi for 3rd generation mobile systems. Request pdf umts air interface introductionumts air interfacecdma2000 air interfacecompatibility issuesenhancing 3g capabilitiesconclusions references and further reading find, read and cite. Overview of umtswcdma technology standardization, cdma technology, wcdma features, spreading and coding, wcdam air interface protocol, uplink physical channels, pdf file.
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