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Key re-establishment protocols in hierarchical wireless sensor networks 分层无线传感器网络中的密钥重建协议
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357989
An-Ni Shen, Song Guo
{"title":"Key re-establishment protocols in hierarchical wireless sensor networks","authors":"An-Ni Shen, Song Guo","doi":"10.1109/EW.2009.5357989","DOIUrl":"https://doi.org/10.1109/EW.2009.5357989","url":null,"abstract":"Many applications of wireless sensor network require secure data communications, especially in a hostile environment. In order to protect the sensitive data and the sensor readings, secret keys should be used to encrypt the exchanged messages between communicating nodes. Traditional asymmetric key cryptosystems are infeasible in WSN due to its low capacity at each senor node. In this paper, we propose a new key distribution scheme for hierarchical WSNs with renewable network devices. Compared to some of the existing schemes, our methods possess the following features that are particularly beneficial to the resource-constrained large-scale WSNs: (1) robustness to the node capture attack, (2) flexibility on key establishment for adding new network devices, (3) scalability in terms of storage cost, and (4) low communication overhead.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114821136","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
Flexible scheduling for Real-Time services in High-Speed Packet Access cellular networks 高速分组接入蜂窝网络中实时业务的灵活调度
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357977
M. Andreozzi, G. Stea, Andrea Bacioccola, Roberto Rossi
{"title":"Flexible scheduling for Real-Time services in High-Speed Packet Access cellular networks","authors":"M. Andreozzi, G. Stea, Andrea Bacioccola, Roberto Rossi","doi":"10.1109/EW.2009.5357977","DOIUrl":"https://doi.org/10.1109/EW.2009.5357977","url":null,"abstract":"This paper presents the HYbrid Channel-Aware and Real-Time scheduler (HY-CART) for UMTS High-Speed Packet Access networks. The latter works for both downlink and uplink scheduling, with slightly different embodiments due to the different technology constraints. Its basic principle is to select users based on their channel conditions when the deadlines are far ahead: as the deadlines approach, they become progressively more important. Furthermore, resources for scheduled users are allocated sparingly, i.e. enough to serve packets whose deadline is actually near, so as to make room for a possibly larger number of simultaneous users, and keeping into account the user channel state. Simulative evaluation shows that HY-CART performs better than the previous work, allowing more users to be served with the same resources.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"20 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116718946","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
Performance & capacity of mobile broadband WiMAX (802.16e) deployed via High Altitude Platform 通过高空平台部署的移动宽带WiMAX (802.16e)的性能和容量
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357976
A. Imran, R. Tafazolli
{"title":"Performance & capacity of mobile broadband WiMAX (802.16e) deployed via High Altitude Platform","authors":"A. Imran, R. Tafazolli","doi":"10.1109/EW.2009.5357976","DOIUrl":"https://doi.org/10.1109/EW.2009.5357976","url":null,"abstract":"This paper investigates the performance and capacity of a WiMAX 802.16e cellular system deployed via High Altitude Platform (HAP WiMAX) through extensive simulations. HAP WiMAX link performance is evaluated for a wide range of channel conditions in terms of elevation angle and signal to noise ratio (SNR) through a comprehensive link level simulator based on 802.16e. The obtained results are then used to investigate HAP WiMAX cellular system performance in terms of user capacity, cell throughput and Grade of Service (GoS) by modelling a multi cellular scenario. The performance is evaluated for frequency reuse of 1 and 3 with and without Adaptive Coding and Modulations (ACM) for two different user data rates. Simulation results show that, cell throughputs as high as 3.6 Mbps per cell can be achieved for 5MHz channel bandwidth while attaining an acceptable GoS with a minimum frequency reuse of 3 in a HAP WiMAX 802.16e system.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131109529","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
Optimal and heuristic DSA policies for cellular networks with Coordinated Access Band 具有协调接入频带的蜂窝网络最优启发式DSA策略
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358013
M. Coupechoux, H. Kamal, P. Godlewski, J. Kélif
{"title":"Optimal and heuristic DSA policies for cellular networks with Coordinated Access Band","authors":"M. Coupechoux, H. Kamal, P. Godlewski, J. Kélif","doi":"10.1109/EW.2009.5358013","DOIUrl":"https://doi.org/10.1109/EW.2009.5358013","url":null,"abstract":"Due to the increasing demands for higher data rate applications, also due to the actual spectrum crowd situation, DSA (Dynamic Spectrum Access) turned into an active research topic. In this paper, we analyze DSA in cellular networks context, where a CAB (Coordinated Access Band) is shared between RANs (Radio Access Networks). We propose an SMDP (Semi Markov Decision Process) 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 a simple, though sub-optimal, DSA heuristic. The achieved reward is shown to be very close to the optimal case and thus to significantly exceed the reward obtained with FSA (Fixed Spectrum Access). Higher rewards and better spectrum utilization with DSA optimal and heuristic methods are however obtained at the price of a reduced average user throughput.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128211714","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
Energy saving potential using active networking on Linux mobile phones 在Linux手机上使用主动网络的节能潜力
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358008
K. Revsbech, J. Heide, K. Hjgaard-Hansen, G. P. Perrucci, F. Fitzek
{"title":"Energy saving potential using active networking on Linux mobile phones","authors":"K. Revsbech, J. Heide, K. Hjgaard-Hansen, G. P. Perrucci, F. Fitzek","doi":"10.1109/EW.2009.5358008","DOIUrl":"https://doi.org/10.1109/EW.2009.5358008","url":null,"abstract":"This work investigates the deployment of active networking on mobile devices. The objective is to determine the possibility of decreasing energy consumption on mobile devices accessing Internet services, by use of active networking. The approach is to move the TCP/IP stack from the mobile device onto an access point. To enable this a light-weight protocol based on Bluetooth has been implemented to facilitate the link between the mobile device and the access point. A design and implementation that is transparent to user applications and runs on the mobile device is presented. The performed tests indicate a decrease in the energy consumption of 25%.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130042667","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
Performance of proportional fair frequency and time domain scheduling in LTE uplink LTE上行链路中比例公平频域调度性能
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358001
F. Calabrese, C. Rosa, K. Pedersen, P. Mogensen
{"title":"Performance of proportional fair frequency and time domain scheduling in LTE uplink","authors":"F. Calabrese, C. Rosa, K. Pedersen, P. Mogensen","doi":"10.1109/EW.2009.5358001","DOIUrl":"https://doi.org/10.1109/EW.2009.5358001","url":null,"abstract":"Channel-aware scheduling is one of the advanced features introduced in the uplink of Long Term Evolution (LTE) in order to improve the system spectral efficiency. In the uplink of LTE channel-aware scheduling is possible thanks to the transmission of sounding reference signals. In this paper the performance of frequency and time domain scheduling in LTE uplink is investigated. In particular, we focus on the performance impact of various scheduling metrics which try to achieve proportional fairness in throughput or resource allocation. Our analysis shows that a combination of a throughput-based metric in the time domain and an SINR-based metric in the frequency domain is able to provide the highest performance. For example, in a noise-limited propagation environment with high inter-site distance the sector throughput gain compared to performing throughput-based proportional fair scheduling in both time and frequency domain is above 20%.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125687895","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: 34
Closed loop transmission for LTE system downlink LTE系统下行链路闭环传输
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357983
Xiaojia Lu, Jin Han, M. Juntti
{"title":"Closed loop transmission for LTE system downlink","authors":"Xiaojia Lu, Jin Han, M. Juntti","doi":"10.1109/EW.2009.5357983","DOIUrl":"https://doi.org/10.1109/EW.2009.5357983","url":null,"abstract":"This paper studies the downlink closed loop transmission in the 3G long term evolution (LTE) system. We propose a precoding matrix selection algorithm from a finite codebook. The precoding, antenna selection, adaptive modulation and coding (AMC) require the channel information fed back from receiver to optimize the system performance. We study the codebook design and precoding matrix selection in LTE system, particularly the single user (SU) in a fading channel scenario. As a comparison to precoding, the antenna subset selection is investigated. The link adaption based on the instantaneous signal-to-noise ratio is also studied. The proposed rank and link adaption algorithm select the precoding matrix and AMC that maximize the spectral efficiency under a certain frame error rate constraint.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131898307","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
Channel quality indication for adaptive resource scheduling in Multihop OFDMA systems 多跳OFDMA系统中自适应资源调度的信道质量指示
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357969
R. Schoenen, D. Bultmann, Zhouyun Xu
{"title":"Channel quality indication for adaptive resource scheduling in Multihop OFDMA systems","authors":"R. Schoenen, D. Bultmann, Zhouyun Xu","doi":"10.1109/EW.2009.5357969","DOIUrl":"https://doi.org/10.1109/EW.2009.5357969","url":null,"abstract":"IMT-advanced systems of the future will be based on OFDMA and frequency divicion duplex will be widely used. Multihop techniques, e.g. the use of fixed relays, are also considered a key technology. The OFDMA resources have the dimensions time, frequency and space. In all these dimensions a radio channel is variable due to fading. On the other hand a complete utilization of the channel capacity close to the Shannon bound is required. Therefore all channel adaptive modulation and coding schemes require good channel state information. For FDD this needs to be signalled back from user terminals to base stations or relays, so that the adaptive scheduling algorithms there can decide optimally. This is performed by channel quality indication. This paper discusses a multimode-capable multistage CQI concept for IMT-advanced systems, shows measurements from simulation and provides the system view including CQI.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131493522","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: 8
On the impact of 2G and 3G network usage for mobile phones' battery life 关于2G和3G网络使用对手机电池寿命的影响
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357972
G. P. Perrucci, F. Fitzek, Giovanni Sasso, Wolfgang Kellerer, Jörg Widmer
{"title":"On the impact of 2G and 3G network usage for mobile phones' battery life","authors":"G. P. Perrucci, F. Fitzek, Giovanni Sasso, Wolfgang Kellerer, Jörg Widmer","doi":"10.1109/EW.2009.5357972","DOIUrl":"https://doi.org/10.1109/EW.2009.5357972","url":null,"abstract":"Over the last years mobile phones had a remarkable evolution. From a simple device for voice communication, it became a full blown multimedia device with multiple features and appealing services. In parallel with the introduction of novel services, mobile devices became more and more energy-hungry reducing the operational time for the user. To extend the battery life of mobile phones is one of the top priorities for mobile phones' manufacturers. This paper presents results of power and energy consumption measurements conducted on mobile phones for 2G and 3G networks. The services under investigation were text messaging, voice and data. The paper reports larger energy consumption in 3G networks for text messaging and voice services than energy consumption in 2G networks. On the other side the 3G networks become more energy friendly when large volumes of data have to be downloaded. The results imply that mobile phones should switch the network in dependency of the service used to save the maximum amount of energy. As this handover consumes energy, we include its analysis in our measurements.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124910585","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: 120
Performance of equal gain combining for quantized estimates of Rayleigh fading channels 等增益组合在瑞利衰落信道量化估计中的性能
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357987
U. H. Rizvi, F. Yilmaz, Mohamed-Slim Alouini, G. Janssen, J. Weber
{"title":"Performance of equal gain combining for quantized estimates of Rayleigh fading channels","authors":"U. H. Rizvi, F. Yilmaz, Mohamed-Slim Alouini, G. Janssen, J. Weber","doi":"10.1109/EW.2009.5357987","DOIUrl":"https://doi.org/10.1109/EW.2009.5357987","url":null,"abstract":"Recently radio frequency (RF) level antenna diversity combining has been proposed as a low cost and power efficient alternative to conventional antenna diversity combining. In RF level diversity combining the diversity weights are implemented in the hardware by making use of circuit elements such as phase shifters and variable gain amplifiers, while channel estimation is performed in the digital baseband domain. In this paper, we analyze the performance of an RF level equal gain combiner. Two alternative but numerically equivalent representations of the probability density function and characteristic function of the combined signal amplitude for binary phase shift keying signals (BPSK) over Rayleigh fading channels are derived. The newly derived characteristic function is then used to evaluate the error probability. Finally, we compare the performance with binary frequency shift keying (BFSK) and differential binary phase shift keying (DBPSK) schemes with diversity reception. It is shown that for only 3 level phase compensation, BPSK exhibits superior performance to both BFSK and DBPSK.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116810905","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
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