Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215546
Francesco Pantisano, M. Bennis, W. Saad, M. Latva-aho, R. Verdone
Underlay femtocells promise to enhance the coverage and rate performance of next-generation wireless networks. Nevertheless, many concerns still remain in the context of shared-spectrum operations and quality of service (QoS) provisioning at the macrocell users. In this paper, we introduce a novel approach for cooperative femtocell-to-femtocell interference management based on interference draining. Accordingly, a group of femtocells can decide to cooperate and improve their downlink rate, by exploiting the available frequency-spatial directions, and still guarantee a minimum target QoS at the closest MUEs. To address this problem, we use tools from cooperative game theory that enable the femtocells to decide, in a distributed manner, on whether to cooperate or not. In the proposed framework, each femtocell access point individually decides its own cooperative strategy, and maximizes a utility function that captures the cooperative gains and the limitations due to the macrocell users QoS targets. We show that, using the proposed approach, the femtocells can self-organize into a network partition composed of disjoint groups of femtocells which form the recursive core of the cooperative game. Simulation results show significant gains in terms of average payoff per femtocell, reaching up to 23%, for a network of K = 140 FBSs, relative to the non-cooperative approach.
{"title":"Enabling macrocell-femtocell coexistence through interference draining","authors":"Francesco Pantisano, M. Bennis, W. Saad, M. Latva-aho, R. Verdone","doi":"10.1109/WCNCW.2012.6215546","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215546","url":null,"abstract":"Underlay femtocells promise to enhance the coverage and rate performance of next-generation wireless networks. Nevertheless, many concerns still remain in the context of shared-spectrum operations and quality of service (QoS) provisioning at the macrocell users. In this paper, we introduce a novel approach for cooperative femtocell-to-femtocell interference management based on interference draining. Accordingly, a group of femtocells can decide to cooperate and improve their downlink rate, by exploiting the available frequency-spatial directions, and still guarantee a minimum target QoS at the closest MUEs. To address this problem, we use tools from cooperative game theory that enable the femtocells to decide, in a distributed manner, on whether to cooperate or not. In the proposed framework, each femtocell access point individually decides its own cooperative strategy, and maximizes a utility function that captures the cooperative gains and the limitations due to the macrocell users QoS targets. We show that, using the proposed approach, the femtocells can self-organize into a network partition composed of disjoint groups of femtocells which form the recursive core of the cooperative game. Simulation results show significant gains in terms of average payoff per femtocell, reaching up to 23%, for a network of K = 140 FBSs, relative to the non-cooperative approach.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124044725","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215493
Milo Spadacini, S. Savazzi, M. Nicoli, S. Nicoli
Wireless machine-to-machine (M2M) networks are becoming a relevant topic in the field of home automation and advanced security systems. A wireless network for indoor intrusion detection is based on several sensors that are deployed over the monitored area for detecting possible risky situations and triggering appropriate actions in response. The network needs to support traffic patterns with different characteristics and quality constraints. Namely, it should provide a periodic low-power monitoring service and, in case of intrusion detection, a real-time alarm propagation mechanism over inherently unreliable wireless links subject to fluctuations of the signal power. Following the guidelines introduced by recent standardization, this paper proposes the design of a wireless network prototype able to satisfy the specifics of the intrusion detection application. A proprietary medium access control is developed based on the low-power SimpliciTI radio stack. Network performance is assessed by experimental measurements using a test-bed operating at 868MHz in an indoor office environment with severe multipath and non line-of-sight propagation conditions.
{"title":"Wireless networks for smart surveillance: Technologies, protocol design and experiments","authors":"Milo Spadacini, S. Savazzi, M. Nicoli, S. Nicoli","doi":"10.1109/WCNCW.2012.6215493","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215493","url":null,"abstract":"Wireless machine-to-machine (M2M) networks are becoming a relevant topic in the field of home automation and advanced security systems. A wireless network for indoor intrusion detection is based on several sensors that are deployed over the monitored area for detecting possible risky situations and triggering appropriate actions in response. The network needs to support traffic patterns with different characteristics and quality constraints. Namely, it should provide a periodic low-power monitoring service and, in case of intrusion detection, a real-time alarm propagation mechanism over inherently unreliable wireless links subject to fluctuations of the signal power. Following the guidelines introduced by recent standardization, this paper proposes the design of a wireless network prototype able to satisfy the specifics of the intrusion detection application. A proprietary medium access control is developed based on the low-power SimpliciTI radio stack. Network performance is assessed by experimental measurements using a test-bed operating at 868MHz in an indoor office environment with severe multipath and non line-of-sight propagation conditions.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121161275","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215527
Bjoern Dusza, Christoph Ide, C. Wietfeld
Due to its advantageous properties in multipath propagation scenarios, the Orthogonal Frequency Division Multiple Access (OFDMA) radio transmission scheme is widely spread in current broadband wireless networks. Exemplary emerging systems based on this technology are the UMTS Long Term Evolution (LTE), Mobile WiMAX and some popular WiFi variants (e.g. IEEE 802.11n). Although analytical and simulative investigations have shown that the increased symbol time of OFDMA (compared with single carrier systems) allows for a wider delay spread without causing Inter Symbol Interference (ISI) it is quite hard to quantify this improvement under realistic circumstances. In this paper, we present the results of a measurement campaign in which we investigated the influence of multipath fading channels, interferences and velocity on the available User Datagram Protocol (UDP) data rate of an IEEE 802.16e conform Mobile WiMAX System. Therefore, a sophisticated laboratory setup was used which is based on a radio channel emulator. From that, optimum switching points for the Adaptive Modulation and Coding (AMC) scheme are derived. The results show, that for vehicular radio channels the choice of the most suitable modulation and coding scheme, and therefore the maximum available data rate, does strongly depend on the environmental parameter such as delay spread and user velocity. In particular, it can be seen that the use of a strong forward error correction is more important than a higher order modulation scheme if high data rates are required by real time multimedia applications.
{"title":"Interference aware throughput measurements for mobile WiMAX over vehicular radio channels","authors":"Bjoern Dusza, Christoph Ide, C. Wietfeld","doi":"10.1109/WCNCW.2012.6215527","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215527","url":null,"abstract":"Due to its advantageous properties in multipath propagation scenarios, the Orthogonal Frequency Division Multiple Access (OFDMA) radio transmission scheme is widely spread in current broadband wireless networks. Exemplary emerging systems based on this technology are the UMTS Long Term Evolution (LTE), Mobile WiMAX and some popular WiFi variants (e.g. IEEE 802.11n). Although analytical and simulative investigations have shown that the increased symbol time of OFDMA (compared with single carrier systems) allows for a wider delay spread without causing Inter Symbol Interference (ISI) it is quite hard to quantify this improvement under realistic circumstances. In this paper, we present the results of a measurement campaign in which we investigated the influence of multipath fading channels, interferences and velocity on the available User Datagram Protocol (UDP) data rate of an IEEE 802.16e conform Mobile WiMAX System. Therefore, a sophisticated laboratory setup was used which is based on a radio channel emulator. From that, optimum switching points for the Adaptive Modulation and Coding (AMC) scheme are derived. The results show, that for vehicular radio channels the choice of the most suitable modulation and coding scheme, and therefore the maximum available data rate, does strongly depend on the environmental parameter such as delay spread and user velocity. In particular, it can be seen that the use of a strong forward error correction is more important than a higher order modulation scheme if high data rates are required by real time multimedia applications.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133515079","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215488
Nourddine Azzaoui, L. Clavier
We consider channel modeling issues in the context where communicating objects are evolving in impulsive environments. It was shown recently that α-stable random processes are attractive solution for representing the ultra wide band communication channel in relatively large spatial areas. In this paper, we consider the α-stable channel modeling in an evolutionary context where the model features depend on spatial locations. We introduce a methodological approach consisting of two parametric and non parametric components: the latter can be seen as black box model to describe the spatial evolution and it can be learned from historical observations of the transfer function. The other component concerns the frequency dependence and has an auto-regressive structure.
{"title":"UWB channel modeling for objects evolving in impulsive environnements","authors":"Nourddine Azzaoui, L. Clavier","doi":"10.1109/WCNCW.2012.6215488","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215488","url":null,"abstract":"We consider channel modeling issues in the context where communicating objects are evolving in impulsive environments. It was shown recently that α-stable random processes are attractive solution for representing the ultra wide band communication channel in relatively large spatial areas. In this paper, we consider the α-stable channel modeling in an evolutionary context where the model features depend on spatial locations. We introduce a methodological approach consisting of two parametric and non parametric components: the latter can be seen as black box model to describe the spatial evolution and it can be learned from historical observations of the transfer function. The other component concerns the frequency dependence and has an auto-regressive structure.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114287018","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215475
M. Siekkinen, J. Nurminen, Antti Ylä-Jääski
We explore the idea of accounting energy consumption of networks on packet-level. IP packets would collect the information of energy that they consumed at each hop and convey it further when travelling through the network. We describe a mechanism to do this accounting and analyze a few use cases including one where packets are given priorities based on how energy efficiently they have travelled the network. Our conclusion is that it would create incentives for Internet service providers (ISPs) to provide a more energy efficient service. In addition to creating incentives, the energy counters in packets could also be used in mechanisms to reduce the energy consumption. We also discuss the limitations and challenges in implementing and deploying such a scheme.
{"title":"Creating green incentives and mechanisms through packet-level energy accounting","authors":"M. Siekkinen, J. Nurminen, Antti Ylä-Jääski","doi":"10.1109/WCNCW.2012.6215475","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215475","url":null,"abstract":"We explore the idea of accounting energy consumption of networks on packet-level. IP packets would collect the information of energy that they consumed at each hop and convey it further when travelling through the network. We describe a mechanism to do this accounting and analyze a few use cases including one where packets are given priorities based on how energy efficiently they have travelled the network. Our conclusion is that it would create incentives for Internet service providers (ISPs) to provide a more energy efficient service. In addition to creating incentives, the energy counters in packets could also be used in mechanisms to reduce the energy consumption. We also discuss the limitations and challenges in implementing and deploying such a scheme.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121416375","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215498
P. Bithas, Athanasios S. Lioumpas, A. Alexiou
Towards the realization of the Internet of Things (IoT), cellular networks are expected to play a fundamental role, providing the ubiquitous coverage and global internetworking. However, due to the physical limitations, namely energy consumption or hardware complexity, of many of these objects, the direct communication with the cellular infrastructure is hindered. In this sense, cluster-based networks have been introduced as an efficient solution, offering coverage extension and energy savings. The energy efficiency and performance of these networks can be further enhanced if the devices can choose between two or more cluster-heads towards their connection to the infrastructure. In this paper, we propose a novel cluster-head (CH) selection algorithm, where the nodes can switch between different CHs, according to the corresponding signal strength, in order to maintain a predefined quality of service constraint. We show that the network reliability significantly increases, especially when considering mobile scenarios, where the connection to a CH may be not feasible, due to shadowing. In addition, the CHs are equipped with multiple antennas for enhanced performance. The performance of this scheme is theoretically investigated over correlated Nakagami-m multipath fading channels, subject also to shadowing. By considering Gamma distributed shadow effects, convenient expressions for important statistical metrics are obtained. The theoretical analysis is accompanied by representative performance evaluation results, complemented by equivalent computer simulated ones, which validate the accuracy of the proposed analysis.
{"title":"Enhancing the efficiency of cluster-based networks through MISO techniques","authors":"P. Bithas, Athanasios S. Lioumpas, A. Alexiou","doi":"10.1109/WCNCW.2012.6215498","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215498","url":null,"abstract":"Towards the realization of the Internet of Things (IoT), cellular networks are expected to play a fundamental role, providing the ubiquitous coverage and global internetworking. However, due to the physical limitations, namely energy consumption or hardware complexity, of many of these objects, the direct communication with the cellular infrastructure is hindered. In this sense, cluster-based networks have been introduced as an efficient solution, offering coverage extension and energy savings. The energy efficiency and performance of these networks can be further enhanced if the devices can choose between two or more cluster-heads towards their connection to the infrastructure. In this paper, we propose a novel cluster-head (CH) selection algorithm, where the nodes can switch between different CHs, according to the corresponding signal strength, in order to maintain a predefined quality of service constraint. We show that the network reliability significantly increases, especially when considering mobile scenarios, where the connection to a CH may be not feasible, due to shadowing. In addition, the CHs are equipped with multiple antennas for enhanced performance. The performance of this scheme is theoretically investigated over correlated Nakagami-m multipath fading channels, subject also to shadowing. By considering Gamma distributed shadow effects, convenient expressions for important statistical metrics are obtained. The theoretical analysis is accompanied by representative performance evaluation results, complemented by equivalent computer simulated ones, which validate the accuracy of the proposed analysis.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116635379","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215495
Nicola Accettura, M. Palattella, M. Dohler, L. Grieco, G. Boggia
Machine-to-machine (M2M) communications refer to the ability of devices to communicate with each other without human intervention. Being arguably the most industrial branch of the emerging Internet of Things (IoT), it has some very stringent requirements on reliability, low-power and often delay. With cellular M2M today still being relatively power hungry, we concentrate in this paper on capillary M2M which is also more cost-efficient. Capillary M2M systems however are known to suffer from poor reliability and unbounded delay. To this end, we argue for a communication stack composed of latest IEEE and IETF protocols, which allows meeting the stringent requirements. Notably, the emerging IEEE 802.15.4e MAC coupled with a suitable IETF 6LoWPAN adaption and IETF ROLL routing protocol is shown to allow for aggressive duty cycling without jeopardizing reliability and delays.
{"title":"Standardized power-efficient & internet-enabled communication stack for capillary M2M networks","authors":"Nicola Accettura, M. Palattella, M. Dohler, L. Grieco, G. Boggia","doi":"10.1109/WCNCW.2012.6215495","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215495","url":null,"abstract":"Machine-to-machine (M2M) communications refer to the ability of devices to communicate with each other without human intervention. Being arguably the most industrial branch of the emerging Internet of Things (IoT), it has some very stringent requirements on reliability, low-power and often delay. With cellular M2M today still being relatively power hungry, we concentrate in this paper on capillary M2M which is also more cost-efficient. Capillary M2M systems however are known to suffer from poor reliability and unbounded delay. To this end, we argue for a communication stack composed of latest IEEE and IETF protocols, which allows meeting the stringent requirements. Notably, the emerging IEEE 802.15.4e MAC coupled with a suitable IETF 6LoWPAN adaption and IETF ROLL routing protocol is shown to allow for aggressive duty cycling without jeopardizing reliability and delays.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124676667","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215506
Jong-Ho Lee, Oh-Soon Shin
In this paper, we propose a distributed beamforming approach to full-duplex relay (FDR) in multiuser multiple-input multiple-output (MIMO) relaying systems. In the proposed scheme, each mobile station (MS) and relay station (RS) performs distributed transmit beamforming and receive combining to suppress the self-interference at the RS as well as the multiuser interference at the MS's, while the base station (BS) performs zero-forcing beamforming with water-filling power allocation. Using the channel reciprocity between the uplink and downlink in time division duplex (TDD) systems, the distributed beamforming is realized in an iterative way without the need for additional information exchange among nodes. Numerical results are presented to verify that the proposed scheme provides substantial performance improvement compared with the half-duplex relay (HDR).
{"title":"Distributed beamforming approach to full-duplex relay in multiuser MIMO transmission","authors":"Jong-Ho Lee, Oh-Soon Shin","doi":"10.1109/WCNCW.2012.6215506","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215506","url":null,"abstract":"In this paper, we propose a distributed beamforming approach to full-duplex relay (FDR) in multiuser multiple-input multiple-output (MIMO) relaying systems. In the proposed scheme, each mobile station (MS) and relay station (RS) performs distributed transmit beamforming and receive combining to suppress the self-interference at the RS as well as the multiuser interference at the MS's, while the base station (BS) performs zero-forcing beamforming with water-filling power allocation. Using the channel reciprocity between the uplink and downlink in time division duplex (TDD) systems, the distributed beamforming is realized in an iterative way without the need for additional information exchange among nodes. Numerical results are presented to verify that the proposed scheme provides substantial performance improvement compared with the half-duplex relay (HDR).","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116741003","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}
Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215508
A. Cattoni, H. Nguyen, J. Duplicy, D. Tandur, B. Badic, R. Balraj, F. Kaltenberger, I. Latif, Ankit Bhamri, G. Vivier, I. Z. Kovacsk, P. Horváth
The market success of broadband multimedia-enabled devices such as smart phones, tablets, and laptops is increasing the demand for wireless data capacity in mobile cellular systems. In order to meet such requirements, the introduction of advanced techniques for increasing the efficiency in spectrum usage was required. Multi User -Multiple Input Multiple Output (MU-MIMO) and Carrier Aggregation (CA) are two important techniques addressed by 3GPP for LTE and LTE-Advanced. The aim of the EU FP7 project on “Spectrum Aggregation and Multi-user-MIMO: real-World Impact” (SAMURAI) is to investigate innovative techniques in the area of MU-MIMO and CA with particular focus on the practical, real-life, implementation and system deployment aspects. In the present paper, we provided an overview of the up-to-date SAMURAI contributions together with a description of the SAMURAI demonstrators developed as core part of the project.
{"title":"Multi-user MIMO and Carrier Aggregation in 4G systems: The SAMURAI approach","authors":"A. Cattoni, H. Nguyen, J. Duplicy, D. Tandur, B. Badic, R. Balraj, F. Kaltenberger, I. Latif, Ankit Bhamri, G. Vivier, I. Z. Kovacsk, P. Horváth","doi":"10.1109/WCNCW.2012.6215508","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215508","url":null,"abstract":"The market success of broadband multimedia-enabled devices such as smart phones, tablets, and laptops is increasing the demand for wireless data capacity in mobile cellular systems. In order to meet such requirements, the introduction of advanced techniques for increasing the efficiency in spectrum usage was required. Multi User -Multiple Input Multiple Output (MU-MIMO) and Carrier Aggregation (CA) are two important techniques addressed by 3GPP for LTE and LTE-Advanced. The aim of the EU FP7 project on “Spectrum Aggregation and Multi-user-MIMO: real-World Impact” (SAMURAI) is to investigate innovative techniques in the area of MU-MIMO and CA with particular focus on the practical, real-life, implementation and system deployment aspects. In the present paper, we provided an overview of the up-to-date SAMURAI contributions together with a description of the SAMURAI demonstrators developed as core part of the project.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121892137","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}
Pub Date : 2012-03-03DOI: 10.1109/WCNCW.2012.6215520
Osama Attia, T. Elbatt
In this paper, we analyze the performance of cooperative content caching in vehicular ad hoc networks (VANETs). In particular, we characterize, using analysis and simulations, the behavior of the probability of outage (i.e. not finding a requested data chunk at a neighbor) under freeway vehicular mobility. First, we introduce a formal definition for the probability of outage in the context of cooperative content caching. Second, we characterize, analytically, the outage probability under vehicular and random mobility scenarios. Next, we verify the analytical results using simulations and compare the performance under a number of plausible mobility scenarios. This provides key insights into the problem and the involved trade-offs and enable us to assess the potential opportunity offered by the, somewhat structured, vehicular mobility that can be exploited by cooperative content caching schemes. The presented numerical results exhibit complete agreement between the analytical and simulation studies. Finally, we observe that vehicular mobility creates opportunities for enhanced outage performance under practically relevant scenarios.
{"title":"On the role of vehicular mobility in cooperative content caching","authors":"Osama Attia, T. Elbatt","doi":"10.1109/WCNCW.2012.6215520","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215520","url":null,"abstract":"In this paper, we analyze the performance of cooperative content caching in vehicular ad hoc networks (VANETs). In particular, we characterize, using analysis and simulations, the behavior of the probability of outage (i.e. not finding a requested data chunk at a neighbor) under freeway vehicular mobility. First, we introduce a formal definition for the probability of outage in the context of cooperative content caching. Second, we characterize, analytically, the outage probability under vehicular and random mobility scenarios. Next, we verify the analytical results using simulations and compare the performance under a number of plausible mobility scenarios. This provides key insights into the problem and the involved trade-offs and enable us to assess the potential opportunity offered by the, somewhat structured, vehicular mobility that can be exploited by cooperative content caching schemes. The presented numerical results exhibit complete agreement between the analytical and simulation studies. Finally, we observe that vehicular mobility creates opportunities for enhanced outage performance under practically relevant scenarios.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"90 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122852233","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：