The physical layer combines the tfi to tfci in the physical control channel, the exception to this is the use of blind transport format. Umtswcdma physical layer technical overview syed ismail. Huawei huawei e3372 lte usb stick product description. Physical layer wcdma for umts wiley online library. Umts long term evolution lte technology introduction.
Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set. When mapping data onto physical layer, mac chooses. Physical layer is the lowest layer within the open systems interconnection osi reference model, including the transmission of signals and the activation and deactivation of physical. From 2 mbps umts to 100 mbps lte to 1 gbps lte advanced 4g lte and lte advanced distinguishing features.
The purpose of this project is to examine how ltes physical layer throughput is a. Services umts most of 3g licenses in europe required operator to deploy. Modeling a 4g lte system in matlab idin motedayenaval. The umts physical layer model consists of an endtoend transmittertoreceiver simulation of the frequency division duplex fdd downlink physical layer for several dedicated channels dch as specified by the 3gpp standard release 99. The physical layer offers different transport channels to mac. Creates physical signals, which support the lowestlevel aspects of the. Long term evolution protocol overview nxp semiconductors. Spreading of the lowbandwidth data signal to produce the wideband cdma signal consists of two steps.
The information travels as far as the transport channel processor in the receiver, but is completely invisible to higher layers. As they tranverse between layers they map to other layer frames. Cell search and cell selection in umts lte application note. The physical layer itself maintains the continuous connection model, especially on the downlink, where there is continuous transmission. The umts physical layer and rf interface is totally different to that of gsm. Carrier frequency synchronization in the downlink of 3gpp lte. Wideband code division multiple access wcdma is the physical layer used for universal terrestrial radio access utra fdd mode. Umts radio interface physical layer free download as powerpoint presentation. Performance of tcp over umts common and dedicated channels. The sublayer mac is located on the top of the physical layer. Osi model 7 layers explained pdf layers functionsthe open systems interconnection model osi model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to their.
In the link layer, there are several rlc blocks, indicating the multiplicity of actions that can simultaneously take place in a 3g mobile. Chockalingam dept of ece, iisc, bangalore tfi and tfci transmitter transport chl 1 transport chl 2 transport block transport block transport block transport block tfi tfi tfci coding and multiplexing physical layer higher layer dpcch qchl dpdch ichl physical control chl physical data chl e. The downlink transmission utilizes orthogonal frequency division multiple access ofdma as the physical layer technique which enables high data rate transmission in frequency selective fading scenarios. A transport channel is characterized by how the information is transferred over the radio interface. Transport formats in umts radio network controllers software implementation masters thesis espoo, january 7, 2008 supervisor. Physical channels and modulation release the present document has been developed within the 3 rd generation partnership project 3gpp tm and may be further elaborated for the purposes of 3gpp. The radio access specifications provide for frequency division duplex fdd and time division duplex tdd variants, and several chip rates are provided for in the tdd option, allowing utra technology to operate in a wide range of bands and coexist with other radio access technologies. Transport channels and their mapping to the physical channels. By doing this, the payload data as well as the control and status data can be carried in an efficient manner.
Physical channels are defined in the physical layer. Umts t errestrial radio access network eutran is one of the 4th. Step by step guide on wimax physical layer transmitter pdf files. The cross reference between gsm, umts, 3gpp and etsi identities can be. Summary this chapter describes the wideband code division multiple access wcdma. According to statistics2, the most common english surname is smith, which corresponds to physical layer cell identity group 0. In any case of existing or perceived difference in contents between such versions, the reference version is the portable document format pdf. The physical layer is expected to perform the following functions in order to provide the data transport service.
Lte physicallayer overview peter wang january, 16, 2011 2. High speed packet access hspa technology syed ismail shah iqra university islamabad, pakistan. However, one of the drawbacks of ofdma is its vulnerability to carrier frequency offset cfo. It uses cdma as the multiple access scheme and modulation based on phase shift. The main features provided by wcdma physical layer are. Transport formats in umts radio network controllers. Umts networks andreas mitschelethiel, jens muckenheim nov.
Frequency division duplex fdd and time division duplex tdd. The access to these services is through the use of transport channels via the mac sublayer. Sends this information to the physical channel processor in the form of physical control channels. Huawei e3372 lte usb stick product description issue 02 20150119 commercial in confidence page 6 of 22 1 overview huawei e3372 lte usb stick hereinafter referred to as the e3372 as a. It continues to provide updated descriptions of the 3gpp standard including the physical layer, radio protocols on layers and a system architecture description. The umts channels are communication channels used by third generation 3g wireless universal mobile telecommunications system umts networks. Umts terrestrial radio access network eutran is one of the 4th. Simulating the long term evolution physical layer christian mehlfuhr er, martin wrulich, josep colom ikuno, dagmar bosanska, markus rupp institute of communications and radiofrequency engineering vienna university of technology gusshausstrasse 25389, a1040 vienna, austria email. Mac offers different logical channels to the radio link control rlc sub layer of layer 2. It compiles in a clear fashion the main technical features of the physical layer standard together with a description of the basics of digital communications and spread spectrum technology on which umts relies. However, the assignment of the transport format combination set is done by l3. Lte also k nown as evolved utra and evolved utran provides new physical layer concepts and protocol architecture for umts. Umts overview david tipper associate professor graduate telecommunications and networking program university of pittsburgh 2720 slides 12 telcom 2720 2 umts etsi proposed gsmnatdma gprs evolution under name universal mobile telecom.
Comprehending the technology behind the umts wideband cdma physical layer the physical layer of the universal mobile telecommunications system umts wideband codedivision multiple access wcdma standard uses direct sequence spread spectrum dsss modulation with a chip rate of 3. Umts is an umbrella term for the third generation radio technologies developed within 3gpp. Protocol and physical layer, qualcomm umts university. The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard. Basics of osi and tcpip layers pdf file function of router ofdm versus ofdma main difference remote radio head or rrh 11a physical layer inside.
The data is sent by transport block from mac layer to physical layer. This book describes the physical layer of umts universal mobile telecommunication system which is one of the five members of the imt2000 family of standards. In this paper, the study of lte phy layer performance evaluation is. In the fdd mode a physical channel is characterized by the code, frequency and in the uplink the relative phase iq. As shown in the figure, there are three types of umts channels viz. Lte physical layer which in itself is a very large and featurerich topic, particularly as there are different modes of operation fddtdd and different downlink and uplink access technologies ofdma, scfdma, along with. Communication with higher layers, logical channels is used and for exchanging information with.
In addition the test cases specified in the standard are described together with their implications on any practical frontend design. A short section on the system architecture, the layer structure of the radio interface and its interworking with higher layers, and the bearer services provided in umts follows. This application note introduces lte fdd and tdd technology and related testing aspects. Third edition edited by harri holma and antti toskala both of nokia, finland. Radio interface protocol architecture for 3g mobile. This tutorial on umts covers umts logical channels, transport channels and physical channels. The wcdma technology provides the umts system some of the new functionalities on the air interface. Lte provides a packet switched model at the sap, but retains a circuit switched model at the phy. I have actually debugged the file mr alex rodriguez has uploaded in the fex. Umts rel 99 physical layer simulation file exchange. Umts channels logical,transport,physical umts channels. Wcdma for umts radio access for third generation mobile communication edited by harri holma and antti toskala.
866 479 1084 92 1180 824 236 146 715 1168 482 225 982 973 706 274 343 1068 905 656 490 1101 260 67 1012 899 1517 442 955 280 553 434 1167 381