European Transactions on Telecommunications最新文献_第5页

Optimal, heuristic and Q-learning based DSA policies for cellular networks with coordinated access band 具有协调访问频带的蜂窝网络的最优启发式和基于q学习的DSA策略

European Transactions on Telecommunications Pub Date : 2010-12-01 DOI: 10.1002/ett.1456

H. Kamal, M. Coupechoux, P. Godlewski, J. Kélif

{"title":"Optimal, heuristic and Q-learning based DSA policies for cellular networks with coordinated access band","authors":"H. Kamal, M. Coupechoux, P. Godlewski, J. Kélif","doi":"10.1002/ett.1456","DOIUrl":"https://doi.org/10.1002/ett.1456","url":null,"abstract":"Due to the increasing demands for higher data rate applications, also due to the actual spectrum crowd situation, Dynamic Spectrum Access (DSA) turned into an active research topic. In this paper, we analyse DSA in cellular networks context, where a Coordinated Access Band (CAB) is shared between Radio Access Networks (RANs). We propose a Semi-Markov Decision Process (SMDP) approach to derive the optimal DSA policies in terms of operator reward. In order to overcome the limitations induced by optimal policy implementation, we also propose two simple, though sub-optimal, DSA algorithms: a Q-learning (QL) based algorithm and a heuristic algorithm. The achieved reward using the latter is shown to be very close to the optimal case and thus to significantly exceed the reward obtained with Fixed Spectrum Access (FSA). The rewards achieved by using the QL-based algorithm are shown to exceed those obtained by using FSA. Higher rewards and better spectrum utilisation with DSA optimal and heuristic methods are, however, obtained at the price of a reduced average user throughput. Copyright © 2010 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"106 1","pages":"694-703"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87947753","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

Persistent resource allocations for VoIP traffic in packet-switching mobile cellular networks 分组交换移动蜂窝网络中VoIP业务的持久资源分配

European Transactions on Telecommunications Pub Date : 2010-12-01 DOI: 10.1002/ett.1455

Klaus Sambale, K. Klagges, R. R. Rad

{"title":"Persistent resource allocations for VoIP traffic in packet-switching mobile cellular networks","authors":"Klaus Sambale, K. Klagges, R. R. Rad","doi":"10.1002/ett.1455","DOIUrl":"https://doi.org/10.1002/ett.1455","url":null,"abstract":"It is expected that future IMT-Advanced systems will operate packet-switched due to the dominance of data services. However, it is inherent to packet-switched systems to not cope well with voice services as periodic resource usage patterns are not signalled efficiently. In this paper, we present a simple technique to reduce the signalling overhead for resource allocations especially for voice-over-IP (VoIP) traffic thus increasing the VoIP capacity of the system, considerably. The proposed technique assigns persistent resource allocation (PRA) per VoIP connection that are valid for a fix number of frames. Resource allocations for succeeding frames have to be signalled by new PRAs. This supersedes any procedures for deallocation of PRAs and associated error handling. Within our work we introduce an analytical model to evaluate the possible VoIP capacity gains. Additionally, we show results of event-driven simulations to validate the analysis. The PRA technique is applicable to all packet-switched systems. We show exemplary results for the WiMAX system. In this paper, we present a simple technique called persistent resource allocation (PRA) to reduce the signalling overhead in packet-switching mobile radio networks, especially for VoIP traffic. The figure shows our idea: resource allocations for mobile station (MS) 42 are signalled in frame n (solid lines) and remain valid in frame up to frame (dashed lines). The parameter k matches the period length of packet arrival in number of frames and m limits the life time (time-to-live) of the PRA. Copyright © 2010 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"9 1","pages":"750-759"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84384381","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: 1

Optimal soft frequency reuse and dynamic sub-carrier assignments in cellular OFDMA networks 蜂窝OFDMA网络中最优软频率复用和动态子载波分配

European Transactions on Telecommunications Pub Date : 2010-12-01 DOI: 10.1002/ett.1434

M. Bohge, J. Gross, A. Wolisz

引用次数: 10

openWNS - a simulation platform for IMT-advanced systems openWNS - imt先进系统的仿真平台

European Transactions on Telecommunications Pub Date : 2010-12-01 DOI: 10.1002/ett.1451

Daniel Bültmann, M. Mühleisen, Sebastian Max, K. Klagges, M. Schinnenburg, B. Walke

引用次数: 3

Network coding and evolutionary theory for performance enhancement in wireless cooperative clusters 无线协作集群性能增强的网络编码和进化理论

European Transactions on Telecommunications Pub Date : 2010-12-01 DOI: 10.1002/ett.1435

L. Militano, F. Fitzek, A. Iera, A. Molinaro

{"title":"Network coding and evolutionary theory for performance enhancement in wireless cooperative clusters","authors":"L. Militano, F. Fitzek, A. Iera, A. Molinaro","doi":"10.1002/ett.1435","DOIUrl":"https://doi.org/10.1002/ett.1435","url":null,"abstract":"SUMMARY Cooperation over short-range wireless links among user devices, which download remote contents through cellular links, is a paradigm quickly gaining ground, given that it can answer several technological and design issues that next-generation wireless applications will raise. Among others, energy consumption, data rate and data transfer time are parameters that will likely benefit from this novel communication concept. This paper presents a WLAN-based cooperative scenario, conceived to support file-sharing services, in which a sub-set of cluster nodes access, through their cellular radio interface, portions of a file to be successively exchanged among all cluster members over wireless local area network (WLAN) links. Besides showing the beneficial effects of cooperation, this paper also focuses on the performance enhancement that can be achieved when using the network coding paradigm, whose deployment revealed to be very effective in the depicted scenario. The selection of the nodes acting as sources for file injection into the cluster is a critical aspect for the effectiveness of the whole system. Therefore, the potentialities offered by the evolutionary theory applied to the specific problem are investigated and an ad hoc conceived Genetic Algorithm (GA) designed. Either the service time (the time needed for all nodes to receive the complete file) or the energy consumption for the nodes is used as objective function, showing in both cases the fast convergence for the algorithm that makes it preferable to either exhaustive searches or random choices. Copyright © 2010 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"97 1","pages":"725-737"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78083647","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: 22

Analytic performance evaluation of MIMO OFDM with pilot-aided channel estimation on doubly selective channels 双选择性信道上带导频辅助信道估计的MIMO OFDM分析性能评价

European Transactions on Telecommunications Pub Date : 2010-11-01 DOI: 10.1002/ett.1436

C. Carbonelli, S. Franz

引用次数: 5

Terminal node self-protection scheme by using unidirectional splitter-based ring 终端节点自保护方案采用基于单向分离器的环

European Transactions on Telecommunications Pub Date : 2010-11-01 DOI: 10.1002/ett.1437

Wu Jia, Song Yu, Yongjun Zhang, Hua Zhang, W. Gu

引用次数: 3

Performance analysis of best-path selection scheme for multi-hop amplify-and-forward relaying 多跳放大转发中继最佳路径选择方案的性能分析

European Transactions on Telecommunications Pub Date : 2010-11-01 DOI: 10.1002/ett.1411

S. Ikki, M. Ahmed

引用次数: 19

Generalised approach for performance analysis of SIR-based multiple selection diversity over constant correlated alpha - µ fading channels 恒定相关alpha - μ衰落信道上基于sir的多选择分集性能分析的广义方法

European Transactions on Telecommunications Pub Date : 2010-11-01 DOI: 10.1002/ett.1417

J. Anastasov, M. Stefanovic, S. Panic, Aleksandar V. Mosic

引用次数: 5

A field study on the fusion of terrestrial and satellite location methods in urban cellular networks 城市蜂窝网络中地面与卫星定位方法融合的实地研究

European Transactions on Telecommunications Pub Date : 2010-11-01 DOI: 10.1002/ett.1433

F. Barceló, I. Martín-Escalona, Cyrille Manente

{"title":"A field study on the fusion of terrestrial and satellite location methods in urban cellular networks","authors":"F. Barceló, I. Martín-Escalona, Cyrille Manente","doi":"10.1002/ett.1433","DOIUrl":"https://doi.org/10.1002/ett.1433","url":null,"abstract":"This work studies the improvement in service coverage obtained by three different approaches to combining two triangulation (terrestrial and satellite) location methods for cellular networks in an urban environment. The paper assumes that the terrestrial cellular network uses enhanced observed time difference (E-OTD) in 2G or observed time difference of arrival (OTDOA) in 3G, while the satellite GNSS uses the assisted global positioning system (A-GPS), but the analysis can be easily generalised to other triangulation methods. A straightforward analytical model is presented to evaluate the service coverage resulting from each of the three approaches. The model is fed with actual coverage figures, gathered from test measurements carried out in Paris (France) for several urban scenarios. Numerical results show that the three approaches lead to improvements in all the tested scenarios, and that the improvement obtained by the increasing complexity of the fusion approach depends highly on the coverage of each individual method and on the joint probability function of individual performances. Copyright © 2010 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"30 1","pages":"632-639"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82316101","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