Wcdma a brief overview by ericsson authorstream presentation. For the love of physics walter lewin may 16, 2011 duration. Wcdma downlink frame structure 1 dpdch dpcch tfci dpdch data2 n data 2. Wcdma was specified in the 3gpp release 99 and 4 of the specification, while lte was specified in the 3gpp release 8 and 9. Umts requirements multimedia service requirements high data rates at least 384 kbps widearea coverage up to 2 mbps indoor and lowrange outdoor coverage high service flexibility packet and circuitoriented services wide range of bit rates with high granularity multiple services on one. Performance analysis of neural network detectors in ds. For example, my wcdma redmi note works in malaysia on maxis 3g. Cdma is a 2g technology and is a direct competitor to gsm, which is the most widely deployed technology. February, 28th 2005 overview in this document i make a study of third mobiles generation systems. Tdscdma this is the 3g band which china mobile uses. Wcdma core network introduction linkedin slideshare.
However, nokia and erickson have just signed an agreement with tmobile to upgrade to 3 rd generation wcdma from gsm. Wcdma and hsdpa wcdma overview wcdma is a transmission technology used for 3g cellular communications. The pcpich is always scrambled by the primary scrambling code of the cell and is spread a factor 256 and an ovsf whose index is zero. Also known as imt2000, as the specifications introduced in service in the years 20002002. What are the differences between tdscdma and wcdma. Wcdma networks are designed to integrate with gsm networks at certain levels. This protocol uses cdma access to send voice and data and signals between mobile phones and cell sites. Hsdpa and hsupa were introduced in 3gpp release 5 and 3gpp release 6, respectively. Code division multiple access 2000 cdma2000 is a third generation 3g standard developed by the international telecommunication union itu. The wcdma technology provides the umts system some of the new functionalities on the air interface. To save battery life, im planning to switch from the automatic to the manual mode, and i want to know what happens if i stick to gsm or wcdma. You must know wcdma which stands for wide band code division multiple access. Tdscdma was designed specifically for the chinese mainland and is used only by china mobile.
The basis of wcdma physical layer is the spreading of transmitted data to the chip rate 3. There is a wcdma phone i want to get but im with cricket whom is on a cdma network. Difference between wcdma and gsm difference between. The most major difference between cdma and wcdma is in the group of technology that it is grouped with. Cdma2000 success story in japan as of nov, 2003 total 3g sub.
Qualcomm still makes chips for wcdma, cdma, and gsm, but it is pushing for older generations for. The difference between these two is that gsm is a 2g technology and wcdma is a part of the newer 3g group of technologies. The ue attempts then to read the pcpich so as to extract the primary scrambling code used in the cell. Wcdma is a third generation mobile communication system that uses cdma technology over a wide frequency band to provide highspeed multimedia and efficient voice services. N data 2 n data 2 10 2 k bits k 0,7 may 28june1, 2001. Leino nokia gsm map wide area coverage hscs a l 15.
Channels specified by a test model number are always detected as active regardless of the power level or modulation quality. What is the technical difference between selecting gsm and selecting wcdma in network mode settings menu. The proposed 3g wideband cdma systems are complex in nature. These techniques are basic and critical to delivering spectrally efficient affordable voice and data services. The more general term evolved radio access network eran, can also be used as part of signaling protocols, as the term access stratum as can be used. Wideband code division multiple access wcdma is a thirdgeneration 3g standard that employs the directsequence code division multiple access dscdma channel access method and the frequencydivision duplexing fdd method to provide highspeed and highcapacity service. Extend and improve the performance of existing wcdma protocols.
Ziemer, colorado springs, co wcdma downlink modulator structure 1. The vsa selects from the following list of predefined transmitter test model configurations as defined in section 6. A brief introduction is provided to the high speed data packet access protocol. Supports 1x evdo evolution data only and 1x evdv evolution data and voice. Wcdma wcdma phones are marketed as china unicom phones in china, but in actual fact wcdma models are compatible with a number of international 3g networks. The comparison reveals that eutran consists of one type of nodes, namely evolved node b enodeb, and the variety of interconnections is. What is code division multiple access 2000 cdma2000. Wcdma is the standard that most gsm carriers moved to when upgrading to 3g. Cellular positioning in wcdma networks using pattern matching anita annie cherian a dissertation submitted to the faculty of engineering and the built environment, university of the witwatersrand, in fulfilment of the requirements of the degree of master of science in engineering johannesburg 2012. This fact, coupled with the desire to operate these systems in concert with a diversity of systems employing other signaling formats seriously complicates the design process. Wcdma wideband code division multiple access wcdma wideband code division multiple access is the radio access scheme used for third generation cellular systems that are being rolled out in various parts of the globe. The wcdma infrastructure is compatible with gsm mobile radio communication system. Spreading and scrambling transport channel combining soft handover compressed mode power control. Umts is built on the global system for mobile communications gsm standard.
It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher bandwidth applications including streaming and. What is wideband code division multiple access wcdma. The 3g systems support wide band services like high speed internet access. 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. Difference between cdma and wcdma difference between. Most wcdma phones include gsm as well, for backward compatibility.
Wcdma, which is an abbreviation for wideband code division multiple access or wideband cdma, is a mobile phone standard which combines cdma and gsm to create an entirely new system. Time divisionsynchronous code division multiple access, utilizes concept of tdma,fdma,cdma and sdma wideband code division multiple access. The discussion is topdown, meaning that it starts from the system point of view and progresses towards the physical layer. Wideband code division multiple access wcdma is the physical layer used for universal terrestrial radio access utra fdd mode. Cdma2000, and wcdma release 99 share many of the same new and evolved techniques. Enhanced services can be provided to cdma one subscribers through cdma2000. Wcdma wide band code division multiple access umts before we talk about 4g or gsm. When the data rates are compared, lte provides massive downlink and uplink speeds than wcdma. Wcdma is a 3g technology that is often used in tandem with gsm to provide both 2g and 3g capabilities within the same area of coverage. What is gsmwcdma and should i leave my settings like this.
The use of whole kpi set will give more information on the performance of the wcdma radio network. Using this bandwidth it has the capacity to carry over 100 simultaneous voice calls, or it is able to carry data at speeds up to 2 mbps in its original format. A few of the new and evolved 3g innovations that are shared by cdma2000 1x and wcdma. If you continue browsing the site, you agree to the use of cookies on this website. Drive test equipment drive test tools,ues, scanner and gps can be used the scanner measures all used carrierscells and their corresponding dl scrambling codes, ue only measures sc signals from the cells that the system has informedordered the ue through the bch neighbour list or via the measurement. Multiuser detection with neural network and pic in cdma systems for awgn and rayleigh fading asynchronous channels article in wireless personal communications 434. Many hspa rollouts can be achieved by a software upgrade to existing 3g networks, giving hspa a head start over wimax, which requires dedicated network infrastructure.
It is one of the most important attributes when it comes to third generation mobile communication network 3g mobile phone technology. Commonalities between qualcomm incorporated october. The transmitter physical layer add cyclic redundant check crc to each. Whereas, cdma stands for code division multiple access. Unlike wcdma, lte supports variable bandwidth from 1. Parts of the wcdma standard are based on gsm technology. A few of the new and evolved 3g innovations that are shared by cdma2000 1x and wcdma standards are.
Umts uses wideband cdma wcdma as the radio transmission standard. Difference between wcdma and lte compare the difference. Wcdma vs gsm wcdma wideband code division multiplexing access and gsm are two technologies that are used in mobile telecommunications. Cdma, code division multiple access an implementation of direct sequence spread spectrum, dsss, and was used almost universally for 3g mobile communications standards as it provided an excellent format as a multiple access scheme.
After channelization, the real valued spread signals are weighted by gain factor s. The robust version of the linear decorrelating detector with three layer recurrent neural network was proposed in 96. Commonalities between qualcomm incorporated october 2006. At first i will center the study in the objectives and main characteristic of this generation. W cdma wideband code division multiple access wcdma wideband code division multiple access is the radio access scheme used for third generation cellular systems that are being rolled out in various parts of the globe. Use improved modulation schemes and refine the protocols by which handsets and base stations communicate. Being newer and more advanced, wcdma is now the technology that people want and it is slowly being deployed in a lot of. Since the primary scrambling codes are grouped into 64 groups of 8 scrambling codes and the ssch has. It is a third generation network developed by ntt docomo and from 2g network cdma. In particular, we focus on the spread spectrum features of the system.
138 738 927 11 1230 658 781 756 690 1036 599 1377 17 519 1534 1208 403 64 1589 591 700 1160 985 759 1537 954 106 984 606 663 289 570 41 1467 655 1650 945 1046 523 951 131 84 348 1442 1140 442 413