{"title":"A new framework to provide quality of service in MPLS network","authors":"A. Foronda, L.C. Pykosz, C. Ohta, M. Yoshimoto","doi":"10.1109/ITS.2006.4433419","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433419","url":null,"abstract":"Traffic engineering (TE) is an important mechanism to maximize network resources and provide Quality of Service (QoS) for different Internet applications and multi protocol label switching (MPLS) enables TE in IP networks. However, the exact framework of MPLS is not specified in the Internet Engineering Task Force (IETF). In this paper, we present a new MPLS framework to guarantee QoS parameters for different types of flow and at the same time, improve the utilization of network resources. Our approach sets up a label switched path (LSP) based on the delay required for the applications and estimates the necessary bandwidth to guarantee this delay. We compare the analytical model with simulations carried out in ns-2 simulator and the results show that with our proposed framework it is possible to guarantee the delay required and improve the use of network resources.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"26-27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116775787","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}
{"title":"Custom error control schemes for energy efficient bluetooth sensor networks","authors":"J. H. Kleinschmidt, W. C. Borelli, M. Pellenz","doi":"10.1109/ITS.2006.4433410","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433410","url":null,"abstract":"This paper analyzes the effect of custom error control schemes on the energy efficiency in Bluetooth sensor networks. The energy efficiency metric considers in just one parameter the energy and reliability constraints of the wireless sensor networks. New packet types are introduced using some error control strategies in the AUX1 packet, such as Hamming and BCH codes, with and without CRC for error detection. Two adaptive techniques are proposed that change the error control strategy based on the number of hops traversed by a packet through the network. The performance results are obtained through simulations in a channel with Rayleigh fading for networks with different number of hops, showing that error control can improve the energy efficiency of a Bluetooth-based sensor network.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117111983","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}
{"title":"A three-dimensional microcellular propagation street model using vectorial analysis in UHF band","authors":"Edgar Silva, G. Carrijo","doi":"10.1109/ITS.2006.4433324","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433324","url":null,"abstract":"In this work we present a vectorial analysis of the three dimensional (3D) street waveguide model in UHF band. For such model the street is modeled as a 3D multislit waveguide and an ideal dipole is assumed to be the transmitting aerial. Horizontal and vertical polarizations are investigated in terms of direct incidence, ground reflection, multiple reflections on the lateral borders of the waveguide and lateral-ground (wall-road) reflections. A comparison is made between different transmitting aerial heights. After that, slits are inserted and comparisons and analysis are made. Comparisons provided with measured data show that a 3D multislit analysis together with a vectorial and gain analysis can be a very useful tool toward increasing theoretical analysis in spite of empirical analysis in the field of prediction.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127519132","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}
{"title":"Admission control for VoIP over HSDPA in a mixed traffic scenario","authors":"A. Braga, S. Wanstedt, Mårten Ericson","doi":"10.1109/ITS.2006.4433245","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433245","url":null,"abstract":"Transporting voice over IP, instead of traditional CS voice, is a necessary prerequisite for an all IP network. Among the hurdles that need to be overcome are the QoS demands of VoIP, which comprise timely and error free delivery of comparatively low rate packet streams. One way to provide the necessary QoS for VoIP is some admission control strategy, where an incoming connection that cannot have its quality requirements fulfilled is blocked. This paper comprises a proposal and evaluation of a call admission control framework aiming at improving system capacity and/or service priorization by providing QoS guarantees for speech users in HSDPA. The main focus is the control of packet delay, since it is a crucial requirement for real-time services. The results show that admission control is able to provide performance improvements and mitigation of the effects from overloaded conditions, in a mixed traffic scenario comprised of VoIP and Web users.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116425574","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}
{"title":"On recurrent neural networks for auto-similar traffic prediction: A performance evaluation","authors":"José Maria P. Menezes, Guilherme A. Barreto","doi":"10.1109/ITS.2006.4433332","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433332","url":null,"abstract":"The NARX network is a recurrent neural architecture commonly used for input-output modelling of nonlinear systems. The input of the NARX network is formed by two tapped-delay lines, one sliding over the input signal and the other one over the output signal. Currently, when applied to nonlinear time series prediction, the NARX architecture is designed as a plain Focused Time Delay Neural Network (FTDNN); thus, limiting its predictive abilities. In this paper, we propose a strategy that allows the original NARX architecture to fully exploit its computational resources to improve prediction performance. We use real-world VBR video traffic time series to evaluate the proposed approach in multi-step-ahead prediction tasks. The results show that the proposed approach consistently outperforms standard neural network based predictors, such as the FTDNN and Flman architectures.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129067947","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}
{"title":"Advanced downlink receivers for GERAN","authors":"V. Bril, P. Diniz, R. Vieira","doi":"10.1109/ITS.2006.4433381","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433381","url":null,"abstract":"This article proposes several types of interference cancellation for the downlink connection in the GSM mobile communications system. The solutions are in the class of dual antenna interference cancellation (DAIC) which utilize two antennas in the mobile station in order to improve the network performance in the link level. The performance of the receivers introduced here are compared with the conventional and the single antenna interference cancellation (SAIC). The results show that the DAIC receivers bring about substantial reduction in the bit-error-rate (BER) in the downlink connection.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"108 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130571343","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}
{"title":"Packet scheduling for Voice over IP over HSDPA in mixed traffic scenarios with different end-to-end delay budgets","authors":"A. Braga, E. Rodrigues, F. Cavalcanti","doi":"10.1109/ITS.2006.4433247","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433247","url":null,"abstract":"By means of dynamic system-level simulations, this work evaluates whether the studied Packet Scheduling (PS) algorithms are capable of guaranteeing the quality of service (QoS) of the voice over IP (VoIP) on a scenario where the VoIP and Web browsing services will compete for the same resources and there is a maximum allowed end-to-end delay for VoIP packets. Two sets of algorithms were considered: QoS-differentiated and non-QoS-differentiated algorithms. It was verified the system capacity gains when the VoIP delay budget is increased. Regarding the PS performance, those algorithms able to perform QoS differentiation presented better performance in terms of system capacity and QoS compared to those non-QoS-differentiated algorithms. Among the former category, those that take into consideration delay requirements of the VoIP service presented the best overall capacity for all traffic mixes and delay budgets.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123869213","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}
{"title":"A mathematical framework to describe interpolated adaptive volterra filters","authors":"E. Batista, O. J. Tobias, R. Seara","doi":"10.1109/ITS.2006.4433400","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433400","url":null,"abstract":"The major drawback for using adaptive Volterra filters in practical applications is the large number of adaptive filter weights required. Many research works can be found in the open literature aiming at reducing the computational burden of Volterra filters. Within this group, interpolated structures also have the purpose of reducing the computational overload. Such structures have been presented in an ad hoc manner in previous works. This paper proposes a formal mathematical framework to describe such a class of simplified adaptive Volterra filters. In addition, new insights on such structures are presented leading to a better understanding on interpolated adaptive Volterra filters. Numerical simulations are shown aiming to assess the performance of these computationally less-demanding structures of implementation.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121940662","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}
Y. Iano, D. Gara Caetano, R. Arthur, E. Carrara, C. Akamine
{"title":"Performance comparison of convolutional and turbo convolutional codes for ISDB-T in AWGN and Brazilian channels","authors":"Y. Iano, D. Gara Caetano, R. Arthur, E. Carrara, C. Akamine","doi":"10.1109/ITS.2006.4433299","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433299","url":null,"abstract":"This work intends to demonstrate the improvements applied in the integrated system digital broadcasting-terrestrial (ISDB-T). The turbo processing has been considered one of the most promising techniques for the improvement of performance in communication systems. The use of turbo convolutional codes (TCCs) combined with soft decision demapping is proposed for reduction of signal to noise rate (SNR) threshold at reception. Some simulations are done using AWGN and typical multipath Brazilian channels. Therefore, it is concluded that the proposed Turbo ISDB-T performance is better than the conventional ISDB-T in those cases.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121779692","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}
{"title":"Enhanced opportunistic beamforming for Jakes-correlated fading channels","authors":"I. R. Baran, B. Uchôa-Filho","doi":"10.1109/ITS.2006.4433422","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433422","url":null,"abstract":"In multiuser communication systems all users can estimate their instantaneous signal-to-noise ratio (SNR) and send this information to the base station (BS), which in turn decides to which user a data packet should be sent. For a large number of users, the channel conditions seen by different users vary independently and, consequently, it is likely that at any one time slot the scheduler will find at least one user whose channel is in favorable conditions (large SNR), yielding what is called multiuser diversity. In fading channels, where the fluctuation dynamics of the channel are limited, opportunistic beamforming (OBF) which employs multiple antennas at the BS can be used. By varying the antenna gains (power and phase) in a random manner, to induce faster and larger fluctuations in fading channels, OBF achieves multiuser diversity. In this paper we propose an enhancement of OBF to improve the overall throughput. By saving at the BS the sequence of antenna gains for each user, along with the corresponding SNRs, for as long as the channel time-coherence is significant, the proposed system can adopt for the selected user the most appropriate antenna gain in the memory, rather than the current gain, as in the original OBF approach. Computer simulation results for the Jakes-correlated fading channels indicate a favorable throughput performance. Moreover, the new approach requires only BS updates, facilitating its adoption.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115897612","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}