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1997 IEEE 47th Vehicular Technology Conference. Technology in Motion最新文献

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Adaptive schemes for packet data in a DS-CDMA environment DS-CDMA环境中分组数据的自适应方案
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600484
O. Sallent, R. Agustí
{"title":"Adaptive schemes for packet data in a DS-CDMA environment","authors":"O. Sallent, R. Agustí","doi":"10.1109/VETEC.1997.600484","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600484","url":null,"abstract":"This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme for improving the throughput of the conventional DS-CDMA slotted-ALOHA system. For this purpose a mobile-assisted algorithm is envisaged to control the change of the transmission rate according to the traffic load. This algorithm revealed that the optimum behavior may be almost reached at a low complexity cost. Moreover, the proposed algorithm was found to be robust to intercell interference.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131800786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Cellular OFDM/CDMA downlink performance in the link and system levels 蜂窝OFDM/CDMA下行链路性能在链路和系统级别
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600450
A. Toskala, J. Castro, L. Chalard, S. Hamalainen, K. Kalliojarvi
{"title":"Cellular OFDM/CDMA downlink performance in the link and system levels","authors":"A. Toskala, J. Castro, L. Chalard, S. Hamalainen, K. Kalliojarvi","doi":"10.1109/VETEC.1997.600450","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600450","url":null,"abstract":"The link and system level performance of a cellular OFDM/CDMA downlink is evaluated. A system level simulator is built to utilise the link level simulation results and to derive the actual network capacity. Three service transmission rates, i.e., 12 kbits/s, 144 kbits/s and 2 Mbits/s have been studied in the evaluation of the suitability of OFDM/CDMA as an UMTS multiple access method. The work has been performed within the European Union ACTS program in the FRAMES project.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"77 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131073683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
On the capacity of a GSM frequency hopping network with intelligent underlay-overlay 基于智能底层叠加的GSM跳频网络容量研究
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605882
T. T. Nielsen, J. Wigard, P. Mogensen
{"title":"On the capacity of a GSM frequency hopping network with intelligent underlay-overlay","authors":"T. T. Nielsen, J. Wigard, P. Mogensen","doi":"10.1109/VETEC.1997.605882","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605882","url":null,"abstract":"This paper describes a method to increase the capacity of a digital cellular network, like GSM, without having to increase the number of available frequencies or base stations. The idea is to split the frequency spectrum into two bands. One consisting of frequencies that can only be used when a high C/I ratio is ensured, the super frequencies, and the other consisting of frequencies that can be used throughout the whole cell, the regular frequencies. The minimum frequency reuse distance of the super frequencies can therefore be smaller than the reuse distance of the regular layer frequencies. By combining this reuse partitioning with frequency hopping, an increase in the network capacity in terms of carried traffic per cell is achieved. Simulations have indicated that for slow moving mobiles a gain of approximately 35% is achieved by this new feature when compared with a frequency hopping network. For faster moving mobiles the simulated gain is lower, approximately 26%. Modifications are proposed to optimise the simulated algorithms, to improve the capacity in terms of carried traffic per cell even further.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131162573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Performance analysis of two-level priority reservation handoff scheme in mobile cellular radio systems 移动蜂窝无线电系统中两级优先保留切换方案的性能分析
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600475
Qing-An Zeng, K. Mukumoto, A. Fukuda
{"title":"Performance analysis of two-level priority reservation handoff scheme in mobile cellular radio systems","authors":"Qing-An Zeng, K. Mukumoto, A. Fukuda","doi":"10.1109/VETEC.1997.600475","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600475","url":null,"abstract":"In this paper we propose a handoff scheme with two-level priority for the reservation of handoff request calls (HRCs) in mobile cellular radio systems. We assume two types of mobile subscribers (MSs) with different distributions of moving speed, that is, users with low average moving speed (e.g. pedestrians) and high average moving speed (e.g. cars). A fixed number of channels in each cell are reserved for HRCs. The remaining channels are shared by both originating calls (OCs) and HRCs. Both kinds of HRCs make their own queues. Out of the channels reserved for HRCs, some are reserved exclusively for the high speed HRCs. The system is modeled by a three-dimensional Markov chain. We apply the successive over-relaxation (SOR) method to obtain blocking probabilities (BPs) of calls, forced termination probabilities (FTPs) and average length of the queues for HRCs. It is shown that FTPs of HRCs can be smaller than BP of OCs and FTP of high speed HRCs is smaller than that of the low speed ones.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133153438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A new medium access control scheme for wireless ATM networks 一种新的无线ATM网络介质访问控制方案
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596367
Yong Jin Kim, Jang-Kyung Kim, Young Hee Lee
{"title":"A new medium access control scheme for wireless ATM networks","authors":"Yong Jin Kim, Jang-Kyung Kim, Young Hee Lee","doi":"10.1109/VETEC.1997.596367","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596367","url":null,"abstract":"We study medium access control (MAC) requirements for the wireless ATM and propose a new MAC scheme named the dynamic slot allocation multiple access (DSAMA) for wireless ATM networks. For a transparent and seamless transport of ATM traffic, the DSAMA supports a variety of service classes, bit rates, and QoS levels associated with ATM. The DSAMA provides a reliable, predictable aspects of medium access similar to those obtained in time division multiple access (TDMA) but is extended for the support of multirate CBR traffic. The DSAMA is a collision-free MAC scheme, and it enables one to limit the maximum slot access delay for multirate CBR traffic to the period of the traffic for guaranteed QoS.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133563945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Determination of optimal handover boundaries in a cellular network based on traffic distribution analysis of mobile measurement reports 基于移动测量报告流量分布分析的蜂窝网络最优切换边界确定
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596369
C. Chandra, T. Jeanes, W. Leung
{"title":"Determination of optimal handover boundaries in a cellular network based on traffic distribution analysis of mobile measurement reports","authors":"C. Chandra, T. Jeanes, W. Leung","doi":"10.1109/VETEC.1997.596369","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596369","url":null,"abstract":"Traffic distributions in a cellular network tend to follow periodic patterns where local congestions occur. By optimizing handover boundaries between neighboring cells, opportunities for load sharing can be exploited to maximize the capacity of the cellular network as a whole. We propose a method for determining optimal handover boundaries by analyzing historical measurement reports data, as an indication of traffic distribution patterns within the network; and modeling the problem as an optimization problem with a set of nonlinear constraints.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133656493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Analysis of parameter sensitivity in a ray-tracing propagation environment 射线追踪传播环境中参数灵敏度分析
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600440
Shuai Wang, J. D. Reed
{"title":"Analysis of parameter sensitivity in a ray-tracing propagation environment","authors":"Shuai Wang, J. D. Reed","doi":"10.1109/VETEC.1997.600440","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600440","url":null,"abstract":"Ray-tracing has become increasingly popular for dense urban microcell prediction, and the results are generally better than can be obtained with other techniques, but questions remain on the sensitivity of the ray tracing algorithms to a number of parameters, including: building materials, environmental parameters, and various types of errors. A number of parameters are tested for its sensitivity to changes in the error of a nominal prediction.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132448409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Performance of multicarrier joint detection CDMA mobile communications systems 多载波联合检测CDMA移动通信系统性能研究
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605887
P. Jung, F. Berens, J. Blanz, J. Plechinger
{"title":"Performance of multicarrier joint detection CDMA mobile communications systems","authors":"P. Jung, F. Berens, J. Blanz, J. Plechinger","doi":"10.1109/VETEC.1997.605887","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605887","url":null,"abstract":"For future mobile communications, an appropriately chosen multiple access scheme is a critical issue. To support robust frequency planning, multi-operator scenarios, system coexistence and hierarchical cell structures, frequency division multiple access (FDMA) and multicarrier techniques are viable choices. Further multiple access schemes presently under discussion are code division multiple access (CDMA) and time division multiple access (TDMA). A mobile radio system concept deploying a hybrid frequency and time divided code division multiple access (F/T/CDMA) scheme with a multicarrier CDMA (MC-CDMA) component, called MC/JD-CDMA, is proposed and performance results for the uplink are presented. Attractive features of the proposed system concept are the possibility to flexibly offer voice and data services with different bit rates, soft capacity, as well as inherent frequency and interferer diversity.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"34 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132672977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
TCP (transmission control protocol) over wireless links 无线链路上的TCP(传输控制协议)
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605396
A. Chan, D. Tsang, S. Gupta
{"title":"TCP (transmission control protocol) over wireless links","authors":"A. Chan, D. Tsang, S. Gupta","doi":"10.1109/VETEC.1997.605396","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605396","url":null,"abstract":"The congestion control policy of the transmission control protocol (TCP) works well today over a wide range of networks. However, if a TCP connection consists of erroneous links, for example, in wireless environment, degradation in throughput and delay performance can be significant. We use simple analysis on the TCP window dynamics to determine the end-to-end throughput of a TCP connection with a wireless link and to demonstrate the impact of high error rate in a wireless environment. To improve the performance of the TCP in a wireless environment, a simple modification to the TCP, which uses negative acknowledgment as an explicit notification for packet corruption is proposed. The performance of the proposed \"NACK\"-based scheme is compared with an existing modified version, LHACK, for both binary and Rayleigh fading channels.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"7 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132733132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 24
Effects of building heights on predictions in Munich using a multiple vertical-knife-edges propagation model 建筑高度对慕尼黑多重垂直刀口传播模型预测的影响
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596360
E. Lachat, J. Wagen, Jingming Li
{"title":"Effects of building heights on predictions in Munich using a multiple vertical-knife-edges propagation model","authors":"E. Lachat, J. Wagen, Jingming Li","doi":"10.1109/VETEC.1997.596360","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596360","url":null,"abstract":"This paper investigates the effects of the building heights on the results of our MCOR prediction tool in the area of Munich (Germany). The goal is to compare predictions performed assuming buildings having a constant height and either (1) predictions considering the buildings with their real heights or (2) measurements. The three dimensional building layout (contour and height) and the topographical data are the geometrical inputs of the prediction tool. The study shows that predictions performed with the real building heights can be well approximated by predictions made with buildings having a constant height. The errors between the two predictions are Gaussian with a standard deviation of about 4 dB. A reasonable approximation of the constant value for the building height is given by the mean building height. Another good approximation of the constant building height value is obtained from a statistical analysis based on a set of measurement points.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131869142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
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