5,364 research outputs found
Adaptive access class barring for efficient mMTC
Get PDF[EN] In massive machine-type communications (mMTC), an immense number of wireless devices communicate autonomously to provide users with ubiquitous access to information and services. The current 4G LTE-A cellular system and its Internet of Things (IoT) implementation, the narrowband IoT (NB-IoT), present appealing options for the interconnection of these wireless devices. However, severe congestion may arise whenever a massive number of highly-synchronized access requests occur. Consequently, access control schemes, such as the access class barring (ACB), have become a major research topic. In the latter, the precise selection of the barring parameters in a real-time fashion is needed to maximize performance, but is hindered by numerous characteristics and limitations of the current cellular systems. In this paper, we present a novel ACB configuration (ACBC) scheme that can be directly implemented at the cellular base stations. In our ACBC scheme, we calculate the ratio of idle to total available resources, which then serves as the input to an adaptive filtering algorithm. The main objective of the latter is to enhance the selection of the barring parameters by reducing the effect of the inherent randomness of the system. Results show that our ACBC scheme greatly enhances the performance of the system during periods of high congestion. In addition, the increase in the access delay during periods of light traffic load is minimal.This research has been supported in part by the Ministry of Economy and Competitiveness of Spain under Grant TIN2013-47272-C2-1-R and Grant TEC2015-71932-REDT. The research of I. Leyva-Mayorga was partially funded by grant 383936 CONACYT-GEM 2014.Leyva-Mayorga, I.; Rodríguez-Hernández, MA.; Pla, V.; Martínez Bauset, J.; Tello-Oquendo, L. (2019). Adaptive access class barring for efficient mMTC. Computer Networks. 149:252-264. https://doi.org/10.1016/j.comnet.2018.12.003S25226414
Metoecus paradoxus (Linnaeus, 1760) (Coleoptera: Ripiphoridae), a new species for the fauna of Israel
Get PDFThe Ripiphoridae (wedge-shaped beetles) contain approximately 450 species worldwide. Like the Meloidae, many wedge-shaped beetles are hypermetamorphic parasitoids. The majority of them attack wasps and bees whilst others attack cockroaches and beetles (Ptinidae and Cerambycidae) (Batelka et al. 2018). The first record of a ripiphorid species from Israel was published by Sahlberg (1912), who reported that Ptilophorus dufourii (Latreille, 1817) was collected at Dayr Aban (a village East of Bet Shemesh, Judean Hills) by Unio Saalas. Pic (1927) mentioned Pterydrias debilis Reitter, 1895, and Bodenheimer (1937) records two species for Israel, Macrosiagon bimaculata (Fabricius, 1787) and Macrosiagon ferruginea (Fabricius, 1781). Argaman and Mendel (1988) reported two Ripiphoridae species as new for Israel, Ripidius vaulogeri Chobaut, 1893 and Evaniocera dufouri Latreille, 1817, but the latter had been already published by Sahlberg (1912). Chikatunov et al. (2006) added Macrosiagon praeusta (Gebler, 1829) and Ripiphorus subdipterus Bosc, 1792 to the list of Israeli wedge-shaped beetles. Metoecus paradoxus (Linnaeus, 1760), commonly referred to as ‘the wasp nest beetle’, is hereby recorded in Israel for the first time. On the 23rd of June 2018 a large nest of Vespula germanica (Fabricius, 1793) was removed by the second author from the vicinity of Merom Golan (a kibbutz at the Golan Heights in the northern part of Israel; 33°08'N 35°46'E). The ruined nest was then exposed to pesticides. Near the nest a female of M. paradoxus was observed. Soon afterward a search inside the ruined nest yielded dead and still alive adults and pupae of M. paradoxus. In total, 33 specimens of M. paradoxus were found: nine pupae and seven newly hatched adults (five females and two males) were found inside closed cells, and 16 adults (14 females and three males) were found freely in the nest. A male and three females were found alive. The living females were observed and photographed while laying eggs on different parts of the nest. A pair of adults is currently deposited at the collection of the first author, housed at the Steinhardt Museum of Natural History, Tel Aviv University.
Cite as: Rittner, O. & Dafny, R. 2018. Metoecus paradoxus (Linnaeus, 1760) (Coleoptera: Ripiphoridae), a new species for the fauna of Israel. Israel Journal of Entomology 48 (1): 79–83.
DOI: 10.5281/zenodo.1342522
urn:lsid:zoobank.org:pub:DB09FE29-BBBB-4996-92F7-455FA 9166DE
A hybrid method for the QoS analysis and parameter optimization in time-critical random access wireless sensor networks
Get PDF[EN] Evolution in electronics has led to the development of complex applications in wireless sensor networks
(WSNs), where efficient and swift event reporting is needed. In time-critical applications, achieving an adequate
report latency is particularly relevant as it allows a proper reaction from the network to the occurring
phenomena. It is evident that mean report latency is insufficient as a QoS indicator for time-critical applications.
Instead, high percentiles or the whole distribution are much better suited. In certain applications such as target
tracking and positioning, the transmission of a certain number of event packets is required to accurately
characterize the occurring phenomena. Building on this, we present a hybrid method for obtaining the
probability distribution of report latency in random access (RA) WSN protocols. In this method, the distribution
of the number of detecting nodes is obtained by simulation, which then allows us to obtain the desired QoS
parameters analytically. In this study, we use our method to obtain and optimize the event report latency and
energy consumption in RA WSNs. Results show that modifying the transmission parameters during backoff
increases the robustness of RA event reporting and also enhances the performance of the WSN in environments
where multiple types of events can be detected.This work has been supported by the Ministry of Economy and Competitiveness of Spain through the project TIN2013-47272-C2-1-R, by CONACyT under project Basic Science 183370 and by IPN SIP project 20150584. The research of Israel Leyva-Mayorga is partially funded by grant 383936 CONACYT-Gobierno del Estado de Mexico 2014Leyva-Mayorga, I.; Pla, V.; Martínez Bauset, J.; Rivero-Angeles, ME. (2017). A hybrid method for the QoS analysis and parameter optimization in time-critical random access wireless sensor networks. Journal of Network and Computer Applications. 83:190-203. https://doi.org/10.1016/j.jnca.2017.01.027S1902038
A new record for the darkling beetle fauna of Israel: Akis subtricostata Redtenbacher, 1850 (Coleoptera: Tenebrionidae)
Get PDFThe distribution range of Akis subtricostata covers Iran, Iraq, Syria (Löbl et al. 2008; Eleyjian 2010) and Turkey (Keskin & Yağmur 2008). Löbl et al. (2008) does not list this species for Jordan; however, it has already been recorded from a few localities in this area. Katbeh-Bader (1996) mentioned it from Dhulayl and Waitzbauer et al. (2004) referred to the area of Petra and Wadi Arava (which is treated here as 'Arava Valley). The senior author collected three specimens of Akis subtricostata (Fig. 1) in the southern area of the 'Arava Valley, Israel on the 12th of September 2014. This is the first record of this species in Israel. Further examination of the Akis specimens deposited in the Steinhardt Museum of Natural History Tel Aviv University, Israel (TAU), revealed three more specimens, all collected in 1968 by J. Klapperich (Bonn) during his 1956–1969 trip to Jordan. Bytinski-Salz (1969: 186) noted on Klapperich’s collecting effort that “the material has been distributed to specialists, but nothing has been published so far”. These three specimens are now the earliest known record from Jordan. It seems that these specimens were sent from Europe back to Israel without being taxonomically treated, and so Akis subtricostata remained unknown from Jordan until the publication of Katbeh-Bader (1996), which was based on a single specimen from Dhulayl. In Israel, the beetles were collected around midnight with a flashlight. They were seen wandering actively on semi stabilized sand dunes near Samar.
Cite as: Rittner, O. & Mienis, H.K. 2015. A new record for the darkling beetle fauna of Israel: Akis subtricostata Redtenbacher, 1850 (Coleoptera: Tenebrionidae). Israel Journal of Entomology 44–45: 61–62.
DOI: 10.5281/zenodo.31200
urn:lsid:zoobank.org:pub:404E0ED8-78C2-42F3-AE94-FAF 4E893D90
Efficient Random Access Channel Evaluation and Load Estimation in LTE-A with Massive MTC
Get PDF© 2019 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works."[EN] The deployment of machine-type communications (MTC) together with cellular networks has a great potential to create the ubiquitous Internet-of-Things environment. Nevertheless, the simultaneous activation of a large number of MTC devices (named UEs herein) is a situation difficult to manage at the evolved Node B (eNB). The knowledge of the joint probability distribution function (PDF) of the number of successful and collided access requests within a random access opportunity (RAO) is a crucial piece of information for contriving congestion control schemes. A closed-form expression and an efficient recursion to obtain this joint PDF are derived in this paper. Furthermore, we exploit this PDF to design estimators of the number of contending UEs in an RAO. Our numerical results validate the effectiveness of our recursive formulation and show that its computational cost is considerably lower than that of other related approaches. In addition, our estimators can be used by the eNBs to implement highly efficient congestion control methods.This work was supported in part by the Ministry of Economy and Competitiveness of Spain under Grants TIN2013-47272-C2-1-R and TEC2015-71932-REDT. The work of L. Tello-Oquendo was supported in part by the Universitat Politecnica de Valencia under the Programa de Ayudas de Investigacion y Desarrollo (PAID). The work of I. Leyva-Mayorga was supported in part by the CONACYT-Gobierno del Estado de Mexico under Grant 383936. The review of this paper was coordinated by Dr. Y. Ji.Tello-Oquendo, L.; Pla, V.; Leyva-Mayorga, I.; Martínez Bauset, J.; Casares-Giner, V.; Guijarro, L. (2019). Efficient Random Access Channel Evaluation and Load Estimation in LTE-A with Massive MTC. IEEE Transactions on Vehicular Technology. 68(2):1998-2002. https://doi.org/10.1109/TVT.2018.2885333S1998200268
Filtering Methods for Efficient Dynamic Access Control in 5G Massive Machine-Type Communication Scenarios
Get PDF[EN] One of the three main use cases of the fifth generation of mobile networks (5G) is massive machine-type communications (mMTC). The latter refers to the highly synchronized accesses to the cellular base stations from a great number of wireless devices, as a product of the automated exchange of small amounts of data. Clearly, an efficient mMTC is required to support the Internet-of-Things (IoT). Nevertheless, the method to change from idle to connected mode, known as the random access procedure (RAP), of 4G has been directly inherited by 5G, at least, until the first phase of standardization. Research has demonstrated the RAP is inefficient to support mMTC, hence, access control schemes are needed to obtain an adequate performance. In this paper, we compare the benefits of using different filtering methods to configure an access control scheme included in the 5G standards: the access class barring (ACB), according to the intensity of access requests. These filtering methods are a key component of our proposed ACB configuration scheme, which can lead to more than a three-fold increase in the probability of successfully completing the random access procedure under the most typical network configuration and mMTC scenario.This research has been supported in part by the Ministry of Economy and Competitiveness of Spain under Grant TIN2013-47272-C2-1-R and Grant TEC2015-71932-REDT. The research of I. Leyva-Mayorga was partially funded by grant 383936 CONACYT-GEM 2014.Leyva-Mayorga, I.; Rodríguez-Hernández, MA.; Pla, V.; Martínez Bauset, J. (2019). Filtering Methods for Efficient Dynamic Access Control in 5G Massive Machine-Type Communication Scenarios. Electronics. 8(1):1-18. https://doi.org/10.3390/electronics8010027S11881Laya, A., Alonso, L., & Alonso-Zarate, J. (2014). Is the Random Access Channel of LTE and LTE-A Suitable for M2M Communications? A Survey of Alternatives. IEEE Communications Surveys & Tutorials, 16(1), 4-16. doi:10.1109/surv.2013.111313.00244Biral, A., Centenaro, M., Zanella, A., Vangelista, L., & Zorzi, M. (2015). The challenges of M2M massive access in wireless cellular networks. Digital Communications and Networks, 1(1), 1-19. doi:10.1016/j.dcan.2015.02.001Tello-Oquendo, L., Leyva-Mayorga, I., Pla, V., Martinez-Bauset, J., Vidal, J.-R., Casares-Giner, V., & Guijarro, L. (2018). Performance Analysis and Optimal Access Class Barring Parameter Configuration in LTE-A Networks With Massive M2M Traffic. IEEE Transactions on Vehicular Technology, 67(4), 3505-3520. doi:10.1109/tvt.2017.2776868Tavana, M., Rahmati, A., & Shah-Mansouri, V. (2018). Congestion control with adaptive access class barring for LTE M2M overload using Kalman filters. Computer Networks, 141, 222-233. doi:10.1016/j.comnet.2018.01.044Lin, T.-M., Lee, C.-H., Cheng, J.-P., & Chen, W.-T. (2014). PRADA: Prioritized Random Access With Dynamic Access Barring for MTC in 3GPP LTE-A Networks. IEEE Transactions on Vehicular Technology, 63(5), 2467-2472. doi:10.1109/tvt.2013.2290128De Andrade, T. P. C., Astudillo, C. A., Sekijima, L. R., & Da Fonseca, N. L. S. (2017). The Random Access Procedure in Long Term Evolution Networks for the Internet of Things. IEEE Communications Magazine, 55(3), 124-131. doi:10.1109/mcom.2017.1600555cmWang, Z., & Wong, V. W. S. (2015). Optimal Access Class Barring for Stationary Machine Type Communication Devices With Timing Advance Information. IEEE Transactions on Wireless Communications, 14(10), 5374-5387. doi:10.1109/twc.2015.2437872Tello-Oquendo, L., Pacheco-Paramo, D., Pla, V., & Martinez-Bauset, J. (2018). Reinforcement Learning-Based ACB in LTE-A Networks for Handling Massive M2M and H2H Communications. 2018 IEEE International Conference on Communications (ICC). doi:10.1109/icc.2018.8422167Leyva-Mayorga, I., Rodriguez-Hernandez, M. A., Pla, V., Martinez-Bauset, J., & Tello-Oquendo, L. (2019). Adaptive access class barring for efficient mMTC. Computer Networks, 149, 252-264. doi:10.1016/j.comnet.2018.12.003Kalalas, C., & Alonso-Zarate, J. (2017). Reliability analysis of the random access channel of LTE with access class barring for smart grid monitoring traffic. 2017 IEEE International Conference on Communications Workshops (ICC Workshops). doi:10.1109/iccw.2017.7962744Leyva-Mayorga, I., Tello-Oquendo, L., Pla, V., Martinez-Bauset, J., & Casares-Giner, V. (2016). Performance analysis of access class barring for handling massive M2M traffic in LTE-A networks. 2016 IEEE International Conference on Communications (ICC). doi:10.1109/icc.2016.7510814Arouk, O., & Ksentini, A. (2016). General Model for RACH Procedure Performance Analysis. IEEE Communications Letters, 20(2), 372-375. doi:10.1109/lcomm.2015.2505280Zhang, Z., Chao, H., Wang, W., & Li, X. (2014). Performance Analysis and UE-Side Improvement of Extended Access Barring for Machine Type Communications in LTE. 2014 IEEE 79th Vehicular Technology Conference (VTC Spring). doi:10.1109/vtcspring.2014.7023042Cheng, R.-G., Chen, J., Chen, D.-W., & Wei, C.-H. (2015). Modeling and Analysis of an Extended Access Barring Algorithm for Machine-Type Communications in LTE-A Networks. IEEE Transactions on Wireless Communications, 14(6), 2956-2968. doi:10.1109/twc.2015.2398858Widrow, B., Glover, J. R., McCool, J. M., Kaunitz, J., Williams, C. S., Hearn, R. H., … Goodlin, R. C. (1975). Adaptive noise cancelling: Principles and applications. Proceedings of the IEEE, 63(12), 1692-1716. doi:10.1109/proc.1975.1003
On the accurate performance evaluation of the LTE-A random access procedure and the access class barring scheme
Get PDF[EN] The performance evaluation of the random access (RA) in LTE-A has recently become a major research topic as these networks are expected to play a major role in future 5G networks. Up to now, the key performance indicators (KPIs) of the RA in LTE-A have been obtained either by performing a large number of simulations or by means of analytic models that, oftentimes, sacrifice precision in exchange for simplicity. In this paper, we present an analytical model for the performance evaluation of the LTE-A RA procedure that incorporates the access class barring (ACB) scheme. By means of this model, each and every one of the KPIs suggested by the 3GPP can be obtained with minimal error when compared with results obtained by simulation. To the best of our knowledge, this paper presents the most accurate analytical model, which can be easily adapted to incorporate modifications of network parameters and/or extensions to the LTE-A system. In addition, our model of the ACB scheme can be easily incorporated to other analytic models of similar nature without further modifications.This work was supported in part by the Ministry of Economy and Competitiveness of Spain under Grant TIN2013-47272-C2-1-R and Grant TEC2015-71932-REDT. The research of I. Leyva-Mayorga was supported under Grant 383936 CONACYT-Gobierno del Estado de Mexico 2014. The research of L. Tello-Oquendo was supported in part by Programa de Ayudas de Investigacion y Desarrollo, Universitat Politecnica de Valencia.Leyva-Mayorga, I.; Tello-Oquendo, L.; Pla, V.; Martínez Bauset, J.; Casares-Giner, V. (2017). On the accurate performance evaluation of the LTE-A random access procedure and the access class barring scheme. IEEE Transactions on Wireless Communications. 16(12):7785-7799. https://doi.org/10.1109/TWC.2017.2753784S77857799161
Slicing a single wireless collision channel among throughput- and timeliness-sensitive services
Get PDFThe fifth generation (5G) of wireless systems has a platform-driven approach, aiming to support heterogeneous connections with very diverse requirements. The shared wireless resources should be sliced in a way that each user perceives that its requirements have been met. Heterogeneity challenges the traditional notion of resource efficiency, as the resource usage has to cater for, e.g., rate maximization for one user and a timeliness requirement for another user. This paper treats a model for radio access network (RAN) uplink, where a throughput-demanding broadband user shares wireless resources with an intermittently active user that wants to optimize the timeliness, expressed in terms of latency-reliability or Age of Information (AoI). We evaluate the trade-offs between throughput and timeliness for Orthogonal Multiple Access (OMA) as well as Non-Orthogonal Multiple Access (NOMA) with successive interference cancellation (SIC). We observe that NOMA with SIC, in a conservative scenario with destructive collisions, is just slightly inferior to that of OMA, which indicates that it may offer significant benefits in practical deployments where the capture effect is frequently encountered. On the other hand, finding the optimal configuration of NOMA with SIC depends on the activity pattern of the intermittent user, to which OMA is insensitive. </p
Spectrum slicing for multiple access channels with heterogeneous services
Get PDFWireless mobile networks from the fifth generation (5G) and beyond serve as platforms for flexible support of heterogeneous traffic types with diverse performance requirements. In particular, the broadband services aim for the traditional rate optimization, while the time-sensitive services aim for the optimization of latency and reliability, and some novel metrics such as Age of Information (AoI). In such settings, the key question is the one of spectrum slicing: how these services share the same chunk of available spectrum while meeting the heterogeneous requirements. In this work we investigated the two canonical frameworks for spectrum sharing, Orthogonal Multiple Access (OMA) and Non-Orthogonal Multiple Access (NOMA), in a simple, but insightful setup with a single time-slotted shared frequency channel, involving one broadband user, aiming to maximize throughput and using packet-level coding to protect its transmissions from noise and interference, and several intermittent users, aiming to either to improve their latency-reliability performance or to minimize their AoI. We analytically assessed the performances of Time Division Multiple Access (TDMA) and ALOHA-based schemes in both OMA and NOMA frameworks by deriving their Pareto regions and the corresponding optimal values of their parameters. Our results show that NOMA can outperform traditional OMA in latency-reliability oriented systems in most conditions, but OMA performs slightly better in age-oriented systems.</p
El Tlacuache Núm. 662 (2015). 662 Año 13 (2015) febrero. El Tlacuache
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