Mar 09, 2014 contents o cellular communication multiple access method cdma introduction o cdma network architecture o call processing in cdma network 3. To respond to the call for cdma innovation, a new physical layer architecture, namely orthogonal complementary coded cdma with offset stacking occ cdma. The 3x standard has now been superseded by a twophase strategy called cdma2000 1xev. Basics idea about cdma technology and its applications. The mobile phone and subscriber identity module, the umts radio access network and, supporting voice with.
Cdma is radically a new concept in wireless communications wherein both data and voice. Cdma2000 is asolution for operators of new radio networks that wish to take advantage from the dynamic ones of the market created by mobility and the internet. Pdf mobile positioning in cdma cellular networks researchgate. Umts network is called a third generation network3g. Pdf new generation of optical noc system with wireless cdma. The proposed cdma system should preferably have an inherent abil ity to.
Nov 15, 2019 cdma is a form of multiple access system based upon direct sequence spread spectrum technology. A programmable architecture for ofdm cdma article pdf available in ieee communications magazine 3711. The ms is the mobile subscriber equipment, which can originate and receive calls and communicate with the bts. Gsm stands for global system for mobile evolution, developed based on 3gpp standards.
When the fcc issued 1900 mhz to pcs in the united states it was based on gsm. Cdma systems are equipment with a protocol that allows the system to adjust in these situations. Study these interview mcq questions and answers on 3g umts wcdma network architecture and interfaces. Is interim standard 95 cdmaone network architecture. Kassas department of electrical and computer engineering university of california, riverside joe. On the performance of tcp over a tddtdcdma architecture.
A 3g mobile network offers good download and upload speeds. Pdf a cdma network architecture using optimized sectoring. Design and implementation of mccdma systems for future. Architecture of the gsm network by dinesh thakur category. Cdmaarchitecture radio resource management networks. Network architecture based on the dualstack solution. Umts uses wideband cdma wcdma as the radio transmission standard.
It is an integration of various technologies including gsm, cdma,gprs,imt2000,wireless lan. Pdf architectural design of a code division multiple access. Telecommunications network and service architectures. Pdf architectural design of a code division multiple. Sep 22, 2019 cdmaone covers larger areas and consumes less power than the other figure describes the cdmaone architecture, with its corresponding interfaces. Cdmaone covers larger areas and consumes less power than the other figure describes the cdmaone architecture, with its corresponding interfaces. The cdma mobile system architecture wiley online library. Both frequency division duplex fdd and time division duplex tdd variants are supported. Gsm and cdma spectrum frequencies the cdma network operates in the frequency spectrum of cdma 850 mhz and 1900 mhz while the gsm network operates in the frequency spectrum of gsm 850 mhz and 1900 mhz. A bipolar cdma code is used to provide a good system performance and to reduce mai. A base transceiver station bts is a piece of equipment that facilitates wireless communication between user equipment ue and a network. W cdma the radio technology of umts is a part of the itu imt2000 family of 3g standards. Cdma is the base on which access methods such as cdmaone, cdma2000, and wcdma are built. Gsm operates on the 900 mhz, 1800 mhz and 1900 mhz.
A design of the codedivision multiple access cdma cellular system architecture is presented. Cdma 2000 1x architecture and feature computer network. The mobile switches of a gsm network may also be replaced by an ngn architecture which is called r4 architecture. Cdma architecture soft handoff cdma systems requires a gps receiver and antenna at every cell base. Umts to gsm or umts to gprs umts supports a variety of user data rates and both packet and circuit switched services system composed of three main subsystems telcom 2720 4 umts system architecture ue user equipment that interfaces with the user utran umts terrestrial radio access network handles all radio. The subscriber carries the mobile station, which is part or rss. Cdma system use the same carrier frequency and may. Abstract in this paper, a new generation of networkonchip noc system with cdma code is proposed. Tdma time division multiple access and cdma code division multiple access. It was the combination of these two network elements that provided the basis for the 3g umts network architecture. Enhanced services can be provided to cdma one subscribers through cdma2000. This handoff is also known as mobile directed handoff.
To permit this without undue interference between the users, cdma. Cdma architecture based on orthogonal complementary codes, chara cterized by its unique spreading modulation scheme, uplink and downlink signatur e design, and receiver implementation for multipath signal detection. 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. Gprs network in 3g is similar to that of the 2g gsm network. Cdma technology was originally designed by qualcomm in the u. Jidoka concept pdf active slow power control is also used on the forward traffic channels, where during a call, the mobile sends cdmaoone messages to the network indicating the quality of the signal. Cdma 2000 1x architecture and feature free download as powerpoint presentation. Cdma is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.
Cdma network architecture consists of following elements mobile station ms. The new mc cdma architecture that has a great potential for future mobile communications tackles this issues comprehensively. Highlevel wcdma ue receiver block architecture figure 1 shows a toplevel diagram of a wcdma ue receiver. The is95 system can be thought of as having many layers of protection against interference. Cdma2000 is as much an air interface as a solution of network to provide the services that the clients demand today. Mccdma, multidspfpga architecture, codesign methodology, hardwaresoftware distribution. The ran is used to process all the radiorelated functions, while the cn is used to process all voice calls and data connections within the umts system, and implements the function of external network switching and routing. Cdma architecture based on orthogonal complementary codes, characterized by its unique spreading modulation scheme, uplink and downlink signature. Multiple users occupying the same band by having different codes is known as cdma code division multiple access system let w spread bandwidth in hz r 1tb date rate s received power of the desired signal in w j received power for undesired signals like multiple access users, multipath. Cdma tutorial pdf version quick guide resources job search discussion code division multiple access cdma is a channel access method normally used by 3g radio communication technology as well as in some other technologies. Umts works on wcdma, cdma2000 and tdscdma implementations by 3gpp and 3gpp2.
Muhammad faisal 4 department of computer science, b acha khan university. Incremental progress 1g amps data capabilities 30 khz. Wcdma the radio technology of umts is a part of the itu imt2000 family of 3g standards. Base station system bss aaa rp pi pi pdsnfa ha aaa st40 st40 ipbased network internet or public data network pdn aaa. The new name was chosen because the considerably greater functionality that the ue could have. The umts architecture takes advantage of the existing gsm and gprs networks which serve as a core network in umts infrastructure. Take this free onlinetest or quiz or trivia on 3g umts cdma2000 cdma network architecture and interfaces. This is absolutely necessary for the soft handoff process. Pdf the standardization phase for wideband cdma systems like umts is running towards its finalization. The base station architecture is based on a universal platform that can support cdma and other cellular standards such as amps and tdma in the same base. 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. It has an open, distributed architecture the separation of switching and service control functions full use of ss7 as the signaling infrastructure its clearly defined and specified interfaces the nature of its in structure general packet radio service gprs and enhanced data rates for global evolution edge cdma, are 3g gsm.
To much noise will cause interference leading to degraded service or dropped calls. Code division multiple access cdma linkedin slideshare. It allows many users to coexist, with minimal mutual interference. You can easily clear job interviews and college exams after taking this 3g quiz. It is assigned to a single user and contains all the functions needed to access umts services. What is code division multiple access 2000 cdma2000. Study these interview mcq questions and answers on 3g umts cdma2000 cdma network architecture and interfaces. As such the system must monitor its noise floor or ambient noise. Code division multiple access or cdma has its roots in wwii era spread spectrum technology. We will also describe the architecture of telecommunication networks.
Codedivision multiple access cdma is a channel access method used by various radio communication technologies. Easily clear job interviews and college exams after studying. The architecture of the cdma mobile sys tem cms is developed based on three func tion groups service resource, service control, and service management. Tarmo anttalainen, introduction to telecommunications, network engineering, 2nd edition, artech house, 2003. A mobile station in a form of a handset, pda, or pcmcia card in handheldportable computer supporting simple ip or mobile ip client or both. Highlevel w cdma ue receiver block architecture figure 1 shows a toplevel diagram of a w cdma ue receiver. Wcdma including the ran radio access network and the cn core network. Technologies tdmafdma cdma gsm european standard is 6 u. The additional of packet data with gprs required additional network entities to be added. Cdmaarchitecture free download as powerpoint presentation. The bts transmits and receives radio signals, realizing communication between the radio system and the mobile station. Cdma architecture cell breathing cdma is a noisegenerated technology.
Abstract in this paper, a new generation of network on chip noc system with cdma code is proposed. To respond to the call for cdma innovation, a new physical layer architecture, namely orthogonal complementary coded cdma with offset stacking occcdma. Lets take a simple analogy to understand the concept of cdma. On the performance of tcp over a tdd tdcdma architecture conference paper in international journal of communication systems 167. Architecture du cdma, principe des codes walsh et pn pseudo noise, architecture cdma, avantages et limites du cdma, multiplexage cdma, comparaison cdma vs tdma. Pdf rf transceiver architectures for wcdma systems like umts. The analogtodigital converter adc in the receivers radio frequency block samples baseband signals from the antennas at a rate of nosf x fc, where fc is the transmission chip rate and nosf is an oversampling factor. Pdf challenges and futuristic perspective of cdma technologies. A digital multiple access technique specified by the telecommunications industry association tia as is95. One of the unique aspect of cdma is that while there are certainly limits to the number of phone calls that can be handled by a carrier.
The gsm base station subsystem bss and the wcdma radio access network ran are both connected to the gsm core network for providing a radio connection to the handset. The umts network architecture can be divided into three main elements. Code division multiple access for wireless communications. This is done in gsm via gaussian minimum shift keying gmsk. Two structures of a detector are employed, which are the pin and. The generic gsm network architecture is composed of three subsystems as the radio subsystem rss, the network and switching subsystem nss and the operation subsystem oss. Pdf version quick guide resources job search discussion code division multiple access cdma is a channel access method normally used by 3g radio communication technology as. Dcs 1900 is considered the gsm standard for north america and is called north american gsm. Gsm network is consists of mobile station, base station subsystembts. References roger l freeman, fundamentals of telecommunications, 2nd edition, wiley 2005. Umts network is called a third generation network 3g. Code division multiple access 2000 cdma2000 is a third generation 3g standard developed by the international telecommunication union itu. Pdf version quick guide resources job search discussion code division multiple access cdma is a channel access method normally used by 3g radio communication technology as well as in some other technologies. Jun 14, 2019 cdmaone covers larger areas and consumes less power than the other figure describes the cdmaone architecture, with its corresponding interfaces.
The mobile phone and subscriber identity module, the umts radio access network and, supporting voice with the circuit switched core network. Mar 30, 2020 cdmaone covers larger areas and consumes less power than the other figure describes the cdmaone architecture, with its corresponding interfaces. The gps antennas synchronize all the cells to one timing source, which is the gps. Pn codes in the form of walsh codes are assigned for communication. Gsm and cdma are competing wireless technologies with gsm enjoying about an 82% market share globally. An efficient, highperformance dsp architecture for wcdma. This protocol uses cdma access to send voice and data and signals between mobile phones and cell sites.
Architecture, security and future challenges ihtesham ul haq 1, zia ur rah man 2, shahid ali 3, engr. The architecture of cdma2000 data system is based on the following components as shown in figure 4. Gsm uses digital communication system or dcs 1800 and is the worlds main 2g standard. This allows several users to share a band of frequencies see bandwidth.
A cdma network architecture using optimized sectoring article pdf available in ieee transactions on vehicular technology 5. Page 2 pdsn, packet core connectivity for cdma networks starent networks, corp. Cdma is the present and future of advanced wireless services code division multiple access cdma is a spread spectrum technology used in second and third generation wireless networks cdmaone identifies 2g and 2. Cdma20001x radio access network ran packet control function pcf. Logically, the cn is divided into the cs circuit switched domain and the ps packet switched.
Is95 uses a 2421 chip period, derived from a 42 bit mask. Cdma pseudonoise sequences are very long, thereby giving excellent crosscorrelation characteristics. The network can be that of any of the wireless communication technologies like gsm, cdma, wireless local loop, wifi, wimax or other wide area. Umts works on wcdma, cdma2000 and tdscdma implementations by 3gpp. Jul 18, 2017 in this video we discuss three topics. Pdf new generation of optical noc system with wireless. In this section we describe the core packet data architecture associated with the cdma radio interface. Cdma established the foundation for 3g technologies is95 cdmaone initial cdma standard from qualcomm may 1995 mobile 3g evolved into two competing standards both based on cdma cdma2000 uses 1. Downlink cdma channel structure reproduced with written permission from tia.
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