Allocation ofsynchronisation channels in a wcdma frame 30 figure 29. This video explains the lte technology basics, ofdma and lte frame structures and types. Lte downlink frame structure long term evolution 4g. The wcdma infrastructure is compatible with gsm mobile radio communication system. Summarizes and surveys current lte technical specifications and implementation options for engineers and newly qualified support staff concentrating on three mobile communication technologies, gsm, 3g wcdma, and ltewhile majorly focusing on radio access network ran technologythis book describes principles of mobile radio technologies that are used in mobile phones and service providers. Tdd frame structure lte any ofdmofdma band is made up of multiple small spaced channels and we call each of these small channels as sub carrier. Again cdma is 2g telecommunication standard and provide very less data rates compared to wcdma which is third g. Lte frame structure lte frame and subframe structure. Wcdma wide band code division multiple access umts before we talk about 4g or gsm. However, nokia and erickson have just signed an agreement with tmobile to upgrade to 3 rd generation wcdma from gsm. Physical channels1 the physical channel is in a 3layer structure by the time. Ltea frame structure radio technology software defined radio.
Comprehesive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. An antenna structure includes a carrier body, a circuit board, a metal coupling sheet, a first grounding part, a second grounding part, and a metal frame. Lte frame structure and resource block architecture. It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher. User equipment ue radio transmission and reception 3gpp ts 36. Frame 0 and frame 5 always downlink in tdd frame 1 and frame 6 is always used as for synchronization in tdd. As wcdma mobile penetration increases, it allows wcdma networks to carry a greater share of voice and data traffic. The frame structure changes depending on the cyclic prefix type, bandwidth and duplexing modes. Summarizes and surveys current lte technical specifications and implementation options for engineers and newly qualified support staff concentrating on three mobile communication technologies, gsm, 3gwcdma, and ltewhile majorly focusing on radio access network ran technologythis book describes principles of mobile radio technologies that are. Primary synchronisation channel allocation in a wcdma system 28 figure 28.
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. Each radio frame is of duration 10ms and composed of 15 slots. The lte frame is nothing but a imaginary grid of time vs frequency, where there are placeholders for different channels and signals, for eg. Physical channels and their structure relative timing between different physical channels in the same link, and relative timing. 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. One of the main reason for this confusion is that even a single cycle of a whole structure requires so many slots and frames, it is really hard to visualize the whole frame structure on a limited space of a sheet of paper or on a. Mbps, where in dsss and cck modulation schemes are employed.
The metal coupling sheet, the first grounding part, and the first slot form a first communication. Fma2 is a singlecarrier wideband cdma solution using a 4. What is wideband code division multiple access wcdma. 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. Umts universal mobile telecommunications system, is the 3g successor to the gsm family of standards including gprs and edge. Lte frame and subframe structure information, overview, or tutorial about the lte frame and subframe structure including lte type 1 and lte type 2 frames. Lte basics part i ofdma and lte frame structures youtube. A high speed 3g mobile wireless technology with capacity to offer higher data rate than cdma.
Space between the chhanel and the next channel is always same regardless of the system bandwidth of the lte band. It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher bandwidth. Base station system model for cell search in a wcdma. The frame structure for the type 2 frames used on lte tdd is somewhat different. Again cdma is 2g telecommunication standard and provide very less data rates compared to wcdma which is. Main differences in lte frame structure between the two modes are. Browse internet while downloading a file from a corporate intranet server in the background research for these was conducted by itu and other. The figures here are only for illustrative purpose only and it may vary in the actual wimax systemstandard. When i am first trying to study gsm, i got so confused about the overal frame structure. Although 3g umts uses a totally different radio access standard, the. N data 2 n data 2 10 2 k bits k 0,7 may 28june1, 2001. Lte frame structure tdd and fdd frame structure of lte. Wcdma was adopted as a standard by the international mobile telecommunications.
Wcdma frame structure structure and function of channels physical channels1. Lte ofdma and downlink frame structure details minimum two dimensional unit is resource element which is made up of one symbol in time domain and one sub carrier in frequency domain. The 10 ms frame comprises two half frames, each 5 ms long. Pdf wcdma system standardization, interfaces and power. Umts uses wideband cdma wcdma as the radio transmission standard. Two slots make one subframe, which is 1ms long 30,720 t s. Fast arq in high speed downlink packet access for wcdma systems. Cell search in frequency division duplex wcdma networks. Noncoherent slot synchronization techniques for wcdma. Wcdma system standardization, interfaces and power control.
Wcdma has the capacity to easily handle bandwidthintensive applications such as video, data, and image transmission necessary for mobile internet services. The subframes may be divided into standard subframes of. The physical layer parameters set by utran may vary between control and data. Layer 2 consists of medium access control mac radio link control rlc the broadcast multicast control bmc packet data convergence protocol pdcp 3.
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. This page covers fixed wimax frame structure as per ofdm technique and mobile wimax frame structure as per ofdma technique. The physical layer has interface to both mac and rrc sublayer. Lowest layer in this interface is physical layer, phy. Wcdma technology provides some advantages for the operator in that it allows the data, but also improves the voice of base. Gsm, in the 2g bands, and has adopted wideband cdma wcdma in. Global system for mobile gsm university of pittsburgh. Lte ofdma and downlink frame structure details teletopix. Pdf wcdma system standardization, interfaces and power control.
Download wcdma wideband code division multiple access, an itu standard derived from code division multiple access cdma is officially known as imt2000 direct spread. The proposed 3g wideband cdma systems are complex in nature. The figure below shows the lte frame structure under time division mode tdd type 2 and frequency division mode fdd type 1. As mentioned as per topologies, tdd and fdd there are two frame structures viz. Jun 03, 20 the lte frame is nothing but a imaginary grid of time vs frequency, where there are placeholders for different channels and signals, for eg. Possibility of fast rate change every 10 ms support of fast power control. 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. In fdd mode, this is done using frame structure type 1. Us20140184449a1 antenna structure for using with a metal. This is also due to another fact that wcdma has to be compatible with gsm while cdma2000 has to be compatible with is 95. A first slot and a second slot are between the metal frame and the carrier body after the parts mentioned above are assembled.
What is the difference between cdma and wcdma networksim. Qualcomm still makes chips for wcdma, cdma, and gsm, but it is pushing for older generations for. Pdf fast arq in high speed downlink packet access for wcdma. A tdma frame is defined on the radio carrier 8 users per carrier channel rate is 270. It is a third generation network developed by ntt docomo and from 2g network cdma. For example, sccpch is transmitted at the multiples of 256 chips delay from the start of cpichstart of frame timing. You must know wcdma which stands for wide band code division multiple access. Radio characteristics measurements including fer, sir, interference power, etc. Wcdma uplink physical layer wcdma downlink physical layer multiplexing and channel coding mcc.
Wcdma umts radio access for third generation mobile communications third edition. Multilevel simulation of wcdma systems for thirdgeneration. Umts system architecture ue user equipment that interfaces with the user utran umts terrestrial radio access network handles all radio related functionality wcdma is radio interface standard here. Oct 08, 2014 the basic difference between the cdma and wcdma is bandwidth,cdma uses 1. Wcdma is a third generation mobile wireless technology offering much higher data speeds to mobile and portable wireless devices than commonly offered in todays market. This is done in gsm via gaussian minimum shift keying gmsk. Voice capacity offered is very high due to interference control mechanisms, including frequency reuse of 1.
1116 1430 821 173 720 356 436 1291 1518 822 29 824 1442 1492 129 603 499 1176 1403 25 1454 451 318 634 1223 350 735 817 99 551 1080 462 218 886 747 168 1325 258 510 1371 516 1312 1291 1430 880