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2012 IEEE 75th Vehicular Technology Conference (VTC Spring)最新文献

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Power-Delay Tradeoff Improvement with Adaptive Modulation Scheme under Practical Power Model 实用功率模型下自适应调制方案的功率延迟权衡改进
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-07-16 DOI: 10.1109/VETECS.2012.6240218
Yan Chen, Shunqing Zhang, Shugong Xu
{"title":"Power-Delay Tradeoff Improvement with Adaptive Modulation Scheme under Practical Power Model","authors":"Yan Chen, Shunqing Zhang, Shugong Xu","doi":"10.1109/VETECS.2012.6240218","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240218","url":null,"abstract":"In this paper, we focus on the power-delay tradeoff for downlink transmission systems. In particular, we target to design the adaptive modulation scheme that achieves the optimal power-delay tradeoff under practical concerns, such as the practical power consumption model of a base station and the dynamics of user traffic. The optimal modulation level selection problem is formulated in a Markov decision problem and a cross-layer approach is adopted to take both queue and channel dynamics into consideration. Simulation results show that the proposed policy achieves about 20% power saving for the same delay performance, compared with fixed modulation level schemes. In addition, the impact of the practical power consumption model under dynamic traffic does change the optimal modulation level selection philosophy.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129442339","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: 0
Protocol Impact of LTE Relays on User Performance LTE中继对用户性能的协议影响
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-07-16 DOI: 10.1109/VETECS.2012.6240068
R. Susitaival
{"title":"Protocol Impact of LTE Relays on User Performance","authors":"R. Susitaival","doi":"10.1109/VETECS.2012.6240068","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240068","url":null,"abstract":"Relays are introduced for LTE Rel-10 in order to improve cell edge bitrates and coverage. 3GPP has specified both inband and outband relays. In this paper, we study the protocol level aspects of relays as well as cell-edge performance of a mobile terminal with system simulations. The results indicate that when a user is performing TCP downloads and uploads, in addition to potential subframe split between the backhaul and access link, also the adopted protocol solution and increased delays have impact on the user performance. Due to this, the bitrates may degrade even with outband relays if the UE having decent macro coverage is connected to a relay. However, when the UE has bad macro coverage, then there are gains from both inband and outband relays.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122645369","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: 0
Location-Aided Transmit Strategy in Bidirectional Relay over MISO Rician Channels MISO信道双向中继的定位辅助传输策略
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-07-16 DOI: 10.1109/VETECS.2012.6239929
Dong Xu, Z. Bai, G. Bruck, P. Jung
{"title":"Location-Aided Transmit Strategy in Bidirectional Relay over MISO Rician Channels","authors":"Dong Xu, Z. Bai, G. Bruck, P. Jung","doi":"10.1109/VETECS.2012.6239929","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239929","url":null,"abstract":"In this paper, performance of location-aided transmit strategy in bidirectional relay networks over Rician fading channel is studied. This work is based on a three node relay system, where on the relay node, multiple antennas are deployed, and single antenna on other nodes. The idea of the location-aided transmit strategy is to acquire angle-of-arrival (AoA) of signal through relative location of devices, and to make use of the AoA in designing transmit beamformers. It is presented in this paper that this practical method for low-cost systems yields good system performance in terms of spectral efficiency when Line-of-Sight components exist in the propagation channel. In addition, the achievable rate performance of such relay network system in the broadcasting phase, which is impacted by Rician K-factor and the relative position between devices, are analyzed.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127058203","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: 0
Voice-Centric LTE Femtocells and Improper Graph Colorings 以语音为中心的LTE飞蜂窝和不正确的图形着色
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-07-16 DOI: 10.1109/VETECS.2012.6240302
L. Garcia, K. Pedersen, P. Mogensen
{"title":"Voice-Centric LTE Femtocells and Improper Graph Colorings","authors":"L. Garcia, K. Pedersen, P. Mogensen","doi":"10.1109/VETECS.2012.6240302","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240302","url":null,"abstract":"This paper addresses carrier-based inter-cell interference coordination (CB-ICIC) among LTE femtocells operating on a single carrier. CB-ICIC is in many ways linked to the widely investigated dynamic channel assignment problem, which is often studied in the context of graph coloring. The investigation revolves around the sensible definition of the underlying graph, i.e. the network model, rather than focusing on the coloring algorithms and their properties. Ultimately, we posit that improper online graph-coloring suffices and is actually preferable. In short, settling for less-than-optimal configurations avoids uncontrolled service interruptions. Such disruptions tend to raise understandable concerns when it comes to fully autonomous selection of operational CCs. Our results dispel such concerns by showing that conservative methods can achieve most of the benefits of unrestricted off-line coloring algorithms with a very modest number (2-3) of CCs to choose from.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124562370","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: 2
Interference Alignment: Improved Design Via Precoding Vectors 干涉对准:基于预编码向量的改进设计
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240141
Yasser Fadlallah, A. Aïssa-El-Bey, K. Amis, R. Pyndiah
{"title":"Interference Alignment: Improved Design Via Precoding Vectors","authors":"Yasser Fadlallah, A. Aïssa-El-Bey, K. Amis, R. Pyndiah","doi":"10.1109/VETECS.2012.6240141","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240141","url":null,"abstract":"The degree of freedom of the Single Input Single Output (SISO) fading interference channel is asymptotically upperbounded by K/2. This upperbound can be achieved using the Interference Alignment approach (IA), proposed by Cadambe et al., In this work, a new optimized design of the IA scheme is presented. It involves introducing, for each user, a combination matrix so as to maximize the sum rate of the network. The optimal design is obtained via an iterative algorithm proposed in the K-user IA network, and a convergence to a local optimum is achieved. Numerical results enable us to evaluate the performance of the new algorithm and to compare it with other designs.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114984929","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: 4
Synchronization of Wireless Sensor Networks Using Natural Environmental Signals Based on Noise-Induced Phase Synchronization Phenomenon 基于噪声相位同步现象的自然环境信号无线传感器网络同步
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240066
M. Harashima, Hiroyuki Yasuda, M. Hasegawa
{"title":"Synchronization of Wireless Sensor Networks Using Natural Environmental Signals Based on Noise-Induced Phase Synchronization Phenomenon","authors":"M. Harashima, Hiroyuki Yasuda, M. Hasegawa","doi":"10.1109/VETECS.2012.6240066","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240066","url":null,"abstract":"We show that the wireless sensor networks can be synchronized by natural environmental signals, such as temperature, humidity and so on. The proposed synchronization scheme is based on the noise-induced phase synchronization theory; the phases of the periodical limit cycle orbits of nonlinear oscillators synchronize with each other by adding a common noise signal to the oscillators. Based on this theory, we synchronize the clocks of the wireless sensor nodes by tuning them according to the phase of their nonlinear oscillator to which natural environmental signals are added as noise. In this paper, first we analyze cross-correlation of the natural environmental signals measured by ZigBee wireless sensor nodes, which are arranged outdoor at about 20m intervals, and show that the cross- correlation among the signals sensed at different sensor nodes are around 0.8 or higher. According to this result, we analyze possibility of the noise- induced phase synchronization with changing cross- correlation between the additive noises, and clarify that the nonlinear oscillators can be synchronized in the cases that the cross-correlation becomes around 0.8 or higher. Finally, we investigate feasibility of the noise-induced phase synchronization by actual data of natural environmental signals sensed at each sensor node and show it is possible to synchronize wireless sensor nodes without any interactions or communications among them.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115771567","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
Detection and Protection of Macro-Users in Dominant Area of Co-Channel CSG Cells 同信道CSG小区优势区宏用户的检测与保护
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240234
Yuanye Wang, K. Pedersen, F. Frederiksen
{"title":"Detection and Protection of Macro-Users in Dominant Area of Co-Channel CSG Cells","authors":"Yuanye Wang, K. Pedersen, F. Frederiksen","doi":"10.1109/VETECS.2012.6240234","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240234","url":null,"abstract":"Co-channel deployment of Closed Subscriber Group (CSG) home-cells or Home E-UTRAN NodeBs (HeNBs) will create coverage holes for macro connected user that is not part of the CSG. In this paper, we address the problem of detecting the macro-cell coverage hole and protecting the macro-users that are located inside such a coverage hole. To reduce the impact of HeNB interference on the macro-cell performance, the HeNBs can be partially muted on some subframes, leading to Time Domain (TDM) muting. With TDM muting, macro-users in the coverage hole can be protected by scheduling them only on the muted subframes that are free of HeNB interference. Different methods for coverage hole detection are considered, and their performance is evaluated under the downlink transmission of a Long Term Evolution (LTE) network. These methods are based on user measurements. Recommendations on the coverage hole detection will be provided based on the obtained results.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124257025","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
Analysis of CQI Prediction for MU-MIMO in LTE Systems LTE系统中MU-MIMO的CQI预测分析
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240035
B. Badic, R. Balraj, T. Scholand, Z. Bai, Stanislaus Iwelski
{"title":"Analysis of CQI Prediction for MU-MIMO in LTE Systems","authors":"B. Badic, R. Balraj, T. Scholand, Z. Bai, Stanislaus Iwelski","doi":"10.1109/VETECS.2012.6240035","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240035","url":null,"abstract":"The aim of this paper is to get an insight of multiuser multiple-input and multiple-output (MU-MIMO) channel quality indicator (CQI) prediction for long term evolution (LTE) systems. MU-MIMO CQI predictions have been investigated for LTE Release 8 (rank one, Transmission Mode 5) and for LTE Release 9 (adaptive rank, Transmission Mode 8) at the link level. The relationship between CQI reporting and channel conditions is analytically analysed and demonstrated. The tradeoff between the performance gain and the feedback overhead w.r.t. MUMIMO CQI prediction is investigated as well. The results have shown how MU-MIMO CQI prediction is influenced by channel correlation and that significant improvements can be achieved through rank adaption and receiver choice. The results have also shown the potentially most efficient system configuration (feedback design and CQI prediction scheme) to facilitate MUMIMO transmission for practical LTE systems.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117206191","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: 10
SafeTRIP: A Bi-Directional Communication System Operating in S-Band for Road Safety and Incident Prevention SafeTRIP:用于道路安全和事故预防的s波段双向通信系统
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240099
M. Celidonio, D. D. Zenobio, E. Fionda, Guillermo Grau Panea, Sebastien Grazzini, B. Niemann, L. Pulcini, S. Scalise, E. Sergio, S. Titomanlio
{"title":"SafeTRIP: A Bi-Directional Communication System Operating in S-Band for Road Safety and Incident Prevention","authors":"M. Celidonio, D. D. Zenobio, E. Fionda, Guillermo Grau Panea, Sebastien Grazzini, B. Niemann, L. Pulcini, S. Scalise, E. Sergio, S. Titomanlio","doi":"10.1109/VETECS.2012.6240099","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240099","url":null,"abstract":"SafeTRIP is a project in progress partially financed by the Seventh Framework Programme's (FP7) European research and development activities in the subtheme of Sustainable Surface Transportation. SafeTRIP intends to implement a demonstrator of an integrated system, from data collection to service provision, that aims at optimising the use of road transport infrastructures. In this paper a general overview of the SafeTRIP architecture is presented. A detailed analysis and description of the functionalities characterizing the main elements of the system and a brief description of infomobility services such as alerting, disaster recovery and dynamic traffic data is given. A relevant part of this architecture is the Satellite Communication System which operates through the W2A Geostationary Satellite. To have an idea of the potentialities of the proposed system, a summary of functional requirements and performances relating to different types of services implemented is reported.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"114 46","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120825564","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: 4
Utility-Based Dynamic Multi-Service Bandwidth Allocation in Heterogeneous Wireless Networks 异构无线网络中基于效用的动态多业务带宽分配
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240014
Wenchao Fei, Hui Tian, Rongrong Lian
{"title":"Utility-Based Dynamic Multi-Service Bandwidth Allocation in Heterogeneous Wireless Networks","authors":"Wenchao Fei, Hui Tian, Rongrong Lian","doi":"10.1109/VETECS.2012.6240014","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240014","url":null,"abstract":"This paper presents a dynamic bandwidth allocation scheme for multiple services in heterogeneous networks. A utility function is introduced first, whose parameters are determined by the modified multi-state Analytic Hierarchy Process (AHP) which adapts to different load levels according to dynamic thresholds. Based on this, a bandwidth allocation algorithm is proposed for Constant Bit Rate (CBR) and Variable Bit Rate (VBR) services depending on not only utility fairness among different networks, but also the fairness between new arrival and ongoing services. Simulation results show that the proposed algorithm is effective in guaranteeing both the fairness of the edge users and the network system performance, i.e. keeping low block probability in the wireless network system.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121057829","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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