If the maximum output power is too high, the device may interfere with other channels or other systems. A thesis submitted in part fulfillment of the degree of master of engineering by research at the faculty of engineering elniversity of technology, sydney. So algorithm 2 is applicable when the environment of mobile environment is quite favourable and the channel fades slowly or hardly fade. Objectives are higher data rates, lower latency on the user plane and control plane and a packetoptimized radio access technology. Pdf queuebased power control in umts systems tommaso. In such systems, in fact, many users transmit over the same radio channel using the same frequency band and time slots so that the. Umts works on wcdma, cdma2000 and tdscdma implementations by 3gpp. Umts through wcdma can be summarized like a revolution of the air interface accompanied by a revolution in the network of their architecture. Amr codec in umts 379 from radio quality measurements and from traffic volume measurements.
Comprehesive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. Umts long term evolution lte technology introduction. Transport formats in umts radio network controllers software implementation degree programme communications engineering laboratory communications laboratory s72 supervisor docent timo o. Fredrik gunnarsson and fredrik gustafsson, control theory aspects of power control in umts, control engineering practice, volume 11, issue 10, pages 111125, october 2003. Outer loop power control sets the signal to interference ratio sirtarget and inner loop power control adjusts the peer entity transmit power so that measured sir fulfills the sirtarget. An energy efficient semistatic power control and link adaptation scheme in umts hsdpa yi huang, jie xu and ling qiu abstract high speed downlink packet access hsdpa has been successfully applied in commercial systems and improves user experience significantly. For details of lte specific power control, you have to refer to ts 36. Moreover, reducing the cpich power enables additional power saving on some of the other common control channels, of which the power. The book explains the rf engineering aspects of umts, key elements of the 3gpp specifications, and practical operation of umts networks. The handover and power control algorithms have been developed and implemented in the framework of a system level. Introduction power control is a crucial radio network function in cellular systems. Outer loop power control sets the target sir for fast power control so that the desired quality is provided. Also, know about frequency bands used in 3g networks.
Power control in umts release 99 request pdf researchgate. Universal mobile telecommunication system umts presented by m mateen shahid 2. Currently, wcdma networks are deployed in umts band of around 2 ghz in europe and asia, including japan and america korea. The accuracies required for gsm power control are relatively stringent. User equipment the umts standard does not restrict the functionality of the user equipment in any way. Eng abstract radio resource management rrm is an essential topic when 3g wcdma networks are being developed. Power control ilpc and the outer loop power control olpc. Wcdma occupies 5 mhz channels and has defined formats for elements such as synchronisation, power control and the like cdma technology. The mobile unit measurement is part of the open loop power control while the base station measurement is part of the closed loop power control. It specifies a complete network system and the technology described in it is popularly referred as freedom of mobile multimedia access foma. In universal mobile telephony system umts the third generation mobile telephony system just being launched power control algorithms play an important role for efficient resource utilization.
It handles power control, modulation and measurements. Simulation results indicate that fractional power control is advantageous compared to the conventional open loop power control in terms of mean cell throughput. Usim umts subscriber identity module is a smart card that holds the subscriber identity, subscribed services, authentication and encryption keys utran node b equivalent to bts in gsmgprs performs the air interface processing channel coding, rate adaptation, spreading, synchronization, power control. In such systems, in fact, many users transmit over the same radio channel using the same frequency band and time slots so. The migration to umts is proposed as a simple way to reduce exposure to electromagnetic waves of the mobile telephony user.
Terminals work as an air interface counter part for nodeb and have many different types of identities. Keywords lte, uplink, power control, fractional power control. This completely revised and updated edition of the highly successful umts signaling provides a deep insight into all aspects of umts signalling. 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 for networks based on the competing cdmaone. It gives an overview from a control perspective of achievements in the area to date with some illuminating examples and pointers to interesting open issues. The device is configured as master unit of zpc line remote io system. Control theory aspects of power control in umts sciencedirect. In universal mobile telephony system umtsthe third generation mobile telephony system just being launchedpower control algorithms play an important role for efficient resource utilization. The umts world is an 3g mobile system news and information provider. The open loop power control tolerance is 9 db normal conditions or 12 db extreme conditions. The output power is 1 db less than the standard power when the rru3959rru3959w is located at a height of 3500 m to 4500 m. Study these interview mcq questions and answers on 3g umts wcdma network architecture and interfaces.
The unit offers high performance for data acquisition, data storage, and wireless data transmission, measurements and alarms. Evaluation and modeling of power control information in a 3g. The umts protocol stack is an enormous project with specifications involving thousands of pages. Dec 21, 2007 umts network planning, optimization, and interoperation with gsm is an accessible, onestop reference to help engineers effectively reduce the time and costs involved in umts deployment and optimization. During this open loop control, it is assumed that both forward link from bs to ms and reverse link from ms to bs are correlated. 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 for networks based on the competing. Wideband code division multiple access wcdma is the physical layer used for universal terrestrial radio access utra fdd mode. This survey article describes and discusses relevant aspects of umts power control with emphasis on practical issues, using an automatic control. This reduces resources and interference, hence, increases the systemwide. A power control algorithm for 3g wcdma system citeseerx. The proposed algorithm can mitigate received sir variations when channel fading changes slowly. In modern cellular communication systems, power control plays a fundamental role for efficient resource utilization.
Scribd is the worlds largest social reading and publishing site. Uplink power control is the ability of the ue transmitter to set its output power in accordance with the measured downlink path loss, which is determined by higher. Request pdf power control in umts release 99 the cdma technology used in umts relies on accurate power control techniques, not only for maximising. Figures for the three main bands in use are given below. Control theory aspects of power control in umts request pdf. Srnc performs dynamical control of power for dedicated channels, within limits admitted by crnc inner loop power control for some radio links of the ue connection may be. The successful trial, deployment, operation and troubleshooting of 3g or umts infrastructures and applications is the.
Power control in wireless cellular networks mung chiang electrical engineering department, princeton university prashanth hande electrical engineering department, princeton university. This paper describes standardized power control in umts and provides control theory aspects of the same with an extensive list of citations. Common pilot channel power control for umts cellular. Due to this fact umts deploys a strict power control, composed by the inner loop. In conclusion, power control is extremely important in umts. In the closed loop mode, the mobile station transmitter power is controlled by a signal from the base station. Where things start to get interesting is with the power dynamics. The physical layer administrates all radio communication. Ue rnc request to modify the amr mode in dl amr encoded speech data in ul ongoing call amr encoded speech data in dl with new amr mode ongoing call request to modify the amr mode. The importance of diversity is analyzed together with fast power. Transport formats in umts radio network controllers.
Dec 09, 2007 in conclusion, power control is extremely important in umts. It is used for setting initial uplink and downlink transmission powers when a ue is accessing the network. Research open access an energy efficient semistatic. Whereas power saving on cpich may not be a crucial aspect to the power controlled voice traffic, it is of great significance to data traffic. Wcdma is deployed in the 850 and 1900 of the existing frequency allocations and the new 3g band 17002100 should be available in the near future.
Based on this estimate, the mobile unit adjusts the transmit power accordingly. Interferensi adalah fitur yang melekat pada sistem cdma dan tidak dapat dihindari, namun mekanismenya harus dipastikan di level minimum yang diperlukan untuk melayani. Moreover, it is capable of tracking rapid changes in fast fading channels, where conventional umts power control algorithms fail to handle. Radio resource management in 3g umts networks diva. Factors such as the intersite distance, frequency reuse factor, power control algorithm, and traffic. After getting strong concept of umts radio architecture and procedures, we worked on different rrm techniques and in the end we analyze two power control. Two special aspects of fast power control are presented as following. In the closed loop power control, feedback is used for adjusting the transmit power level. Umts technology explained umts technology explained, ppt file. Power control and if you want to have some handson experience of these, i would recommand you to try some test items on 36. However to ensure the competitiveness of umts for the next decade and beyond, concepts for umts long term evolution lte have been first time introduced in 3gpp release 8. The power level numbers vary according to the gsm band in use.
The design contains a lot of flexibility to allow power control at different levels. Downlink power control parameters when downlink power control parms f1 is pressed, the following parameters are displayed in the downlink power control parameters middle menu. Power control in wcdma is a closedloop pc which is a combination of outer and. The chapter structure has been reworked for improved usability for readers, as well as including many new features and updates. Pdf outerloop power control in a live umts network. The future lines that are considered in the present, and other comment that already are in their last phase of development in the field of the mobile technology. Umts network is called a third generation network3g. The relationship between fast power control and diversity. The universal mobile telecommunications system umts, based on the gsm standards, is a mobile cellular system of third generation that is maintained by 3gpp 3rd generation partnership project. The openloop power control is employed at the beginning of a connection, and an uplink dedicated channel dch or common packet channel cpch, is not yet allocated. Spreading and scrambling transport channel combining soft handover compressed mode power control. In this paper we present a soft handover algorithm for wide band cdma based e umts networks and the associated power control algorithm.
With algorithm 2, the inner loop power control is performed every five timeslots, that is, the frequency is lower to perform inner loop power control in algorithm 2. Hanus, admission control techniques for umts system the voice activity factor of the j th session. Pdf the outer loop power control olpc in wcdma systems allows to achieve a defined quality of service qos for every link. Umts technical umts universal mobile telephone service is a third generation 3g mobile system being developed by etsi within the itus imt2000 framework. Pdf power control with antenna array processing for umts. Pdf simulating soft handover and power control for. The wcdma technology provides the umts system some of the new functionalities on the air interface. The command is sent to the encoder inside the tc via the iu interface.
Power control in umts power control in umts can be widely classified as two types. Request pdf control theory aspects of power control in umts the global communication systems critically rely on control algorithms of various kinds. Open loop power control vs closed loop power control. Queuebased power control in umts systems luigi chisci, lorenzo mucchi and tommaso pecorella abstractin modern cellular communication systems, power control plays a fundamental role for ef. The handover and power control algorithms have been developed and implemented in the framework of a system level e umts simulator developed under the ist seacorn project. The umts airinterface in rf engineering shows you how to design, build, and operate the 3g wireless networks that carry most of todays global voice and data communications. Umts power control open loop power control is the ability of the ue transmitter to sets its output power to a specific value. Easily clear job interviews and college exams after studying these multiple choice. The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard. Outerloop power control in a live umts network tu wien. Downlink power control state this parameter allows you to enable or disable downlink power control when a rb test mode call is established.
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