Pub Date : 2006-12-11DOI: 10.1109/PIMRC.2006.254244
T. Ohseki, N. Fuke, H. Ishikawa, Y. Takeuchi
In this paper, we present a multihop mobile communications system utilizing fixed relay stations to enhance the coverage of the service area. A multihop mobile communications system was originally proposed as a system in which only mobile stations relay communication between other mobile stations and a base station to solve the problem of poor coverage expected in a future cellular system. In the system, however, a probability of a mobile station being able to connect with a base station via their relay functions is governed by a probability of mobile stations existing in its neighborhood. Therefore, we introduce fixed stations as relay stations in addition to relay functions of mobile stations to enhance the probability of link conductivity between a base station and a mobile station. By adopting this multihop architecture, a mobile station which needs relay functions can choose relay stations among fixed relay stations or other mobile stations. Moreover, we also examine its time slot allocation methods. We confirmed that the ratio of successful connection between mobile stations and base stations improved about 0.15 by introducing just 4 fixed relay stations in a certain environment
{"title":"Multihop Mobile Communications System Adopting Fixed Relay Stations and its Time Slot Allocation Schemes","authors":"T. Ohseki, N. Fuke, H. Ishikawa, Y. Takeuchi","doi":"10.1109/PIMRC.2006.254244","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254244","url":null,"abstract":"In this paper, we present a multihop mobile communications system utilizing fixed relay stations to enhance the coverage of the service area. A multihop mobile communications system was originally proposed as a system in which only mobile stations relay communication between other mobile stations and a base station to solve the problem of poor coverage expected in a future cellular system. In the system, however, a probability of a mobile station being able to connect with a base station via their relay functions is governed by a probability of mobile stations existing in its neighborhood. Therefore, we introduce fixed stations as relay stations in addition to relay functions of mobile stations to enhance the probability of link conductivity between a base station and a mobile station. By adopting this multihop architecture, a mobile station which needs relay functions can choose relay stations among fixed relay stations or other mobile stations. Moreover, we also examine its time slot allocation methods. We confirmed that the ratio of successful connection between mobile stations and base stations improved about 0.15 by introducing just 4 fixed relay stations in a certain environment","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"355 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122044937","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254320
M. Sarkiss, Y. Yuan-Wu
In this paper, linear scalable dispersion (LSD) code is investigated for multiple input multiple output multi-carrier code division multiple access (MIMO MC-CDMA) systems. The code already introduced in MIMO systems is extended to the MC-CDMA downlink transmission. It provides a flexible compromise between diversity and spatial multiplexing in Rayleigh and Ricean fading channels; therefore, it realizes high transmission rate while benefiting from transmit diversity. In this context, we show through simulations that LSD scheme improves significantly the performance in different channel conditions
{"title":"Linear Scalable Dispersion Codes for Downlink MIMO MC-CDMA Systems","authors":"M. Sarkiss, Y. Yuan-Wu","doi":"10.1109/PIMRC.2006.254320","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254320","url":null,"abstract":"In this paper, linear scalable dispersion (LSD) code is investigated for multiple input multiple output multi-carrier code division multiple access (MIMO MC-CDMA) systems. The code already introduced in MIMO systems is extended to the MC-CDMA downlink transmission. It provides a flexible compromise between diversity and spatial multiplexing in Rayleigh and Ricean fading channels; therefore, it realizes high transmission rate while benefiting from transmit diversity. In this context, we show through simulations that LSD scheme improves significantly the performance in different channel conditions","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124826408","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254185
J. Suhonen, M. Kuorilehto, Marko Hännikäinen, T. Hämäläinen
This paper presents an energy-efficient multi-hop routing protocol for wireless sensor networks. The protocol uses cost metrics to create gradients from a source to a destination node. The cost metrics consist of energy, node load, delay, and link reliability information that provide a trade-off between performance and energy usage. A node can query routes from its neighbors, which allows efficient recovery from route losses. The protocol is the first cost-field based WSN routing protocol suitable for low processing and memory capacity nodes that is tested in a practical real-world environment. The protocol performance is evaluated on full scale prototype implementation consisting of 38 ultra-low power nodes in indoor environment. Compared to traditional flooding, the protocol requires only 25% of the bandwidth, while having smaller end-to-end delays
{"title":"Cost-Aware Dynamic Routing Protocol for Wireless Sensor Networks - Design and Prototype Experiments","authors":"J. Suhonen, M. Kuorilehto, Marko Hännikäinen, T. Hämäläinen","doi":"10.1109/PIMRC.2006.254185","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254185","url":null,"abstract":"This paper presents an energy-efficient multi-hop routing protocol for wireless sensor networks. The protocol uses cost metrics to create gradients from a source to a destination node. The cost metrics consist of energy, node load, delay, and link reliability information that provide a trade-off between performance and energy usage. A node can query routes from its neighbors, which allows efficient recovery from route losses. The protocol is the first cost-field based WSN routing protocol suitable for low processing and memory capacity nodes that is tested in a practical real-world environment. The protocol performance is evaluated on full scale prototype implementation consisting of 38 ultra-low power nodes in indoor environment. Compared to traditional flooding, the protocol requires only 25% of the bandwidth, while having smaller end-to-end delays","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129589197","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254030
L. Berlemann, C. Hoymann, G. Hiertz, B. Walke
The coexistence of IEEE 802.16 (WiMAX) and IEEE 802.11 (WiFi) in shared radio spectrum is an acute problem. In license-exempt frequency bands, the frame-based medium access of 802.16 requires rigorous protection against interference from wireless local area networks in order to operate properly when sharing spectrum. We focus here on the unlicensed U-NII frequency band at 5 GHz and consider therefore the distributed medium access of 802.11(a) as competitor for spectrum utilization. We expect 802.16 systems to be available in laptops soon and then to provide wireless VoIP services that 802.11 cannot support satisfactorily well. Therefore, this paper describes approaches for enabling a reliable operation of 802.16 when sharing unlicensed spectrum with 802.11. We propose software upgrades to the medium access control of the 802.16 BS. Thereby, no 802.11 frame transmissions are required by an 802.16 system. Coexistence between 802.16 and 802.11 is enabled without any data exchange between both standards. Our solution of the described coexistence problem implies the possibility to guarantee quality-of-service within the 802.16 system although operating in unlicensed frequencies
{"title":"Unlicensed Operation of IEEE 802.16: Coexistence with 802.11(A) in Shared Frequency Bands","authors":"L. Berlemann, C. Hoymann, G. Hiertz, B. Walke","doi":"10.1109/PIMRC.2006.254030","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254030","url":null,"abstract":"The coexistence of IEEE 802.16 (WiMAX) and IEEE 802.11 (WiFi) in shared radio spectrum is an acute problem. In license-exempt frequency bands, the frame-based medium access of 802.16 requires rigorous protection against interference from wireless local area networks in order to operate properly when sharing spectrum. We focus here on the unlicensed U-NII frequency band at 5 GHz and consider therefore the distributed medium access of 802.11(a) as competitor for spectrum utilization. We expect 802.16 systems to be available in laptops soon and then to provide wireless VoIP services that 802.11 cannot support satisfactorily well. Therefore, this paper describes approaches for enabling a reliable operation of 802.16 when sharing unlicensed spectrum with 802.11. We propose software upgrades to the medium access control of the 802.16 BS. Thereby, no 802.11 frame transmissions are required by an 802.16 system. Coexistence between 802.16 and 802.11 is enabled without any data exchange between both standards. Our solution of the described coexistence problem implies the possibility to guarantee quality-of-service within the 802.16 system although operating in unlicensed frequencies","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129624041","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254152
J. Orriss, R. Verdone
We investigate a hierarchical wireless hybrid network, implementing two different network paradigms: ad hoc and infrastructure-based systems, where mobile gateways, equipped with both cellular and infrastructure-less air interfaces, allow integration of the two separate paradigms. The paper reports results achieved through a mathematical analysis of the topology of wireless links, providing the distribution of the number of lowest-level nodes attached to the highest level. Nodes have a maximum capacity, and seek service at the upper level through a retry mechanism where the nodes are addressed according to a ranked list based on the level of received power. The mathematical analysis provides a means to allow access control, depending on the maximum number of radio resource units available at each node and the maximum number of retries at each level. Wireless nodes at different levels are uniformly distributed over the bi-dimensional plane with different densities; path loss and shadowing are included with different propagation parameters, different air interfaces are used, and different hard capacities characterise the nodes at the different levels. With respect to other papers recently presented by the authors to other conferences, this work focuses on the role of the node capacity limitations and the maximum number of retries
{"title":"A Statistical Analysis of the Effect of Capacity Limitation and Retry for Hierarchical Wireless Hybrid Networks","authors":"J. Orriss, R. Verdone","doi":"10.1109/PIMRC.2006.254152","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254152","url":null,"abstract":"We investigate a hierarchical wireless hybrid network, implementing two different network paradigms: ad hoc and infrastructure-based systems, where mobile gateways, equipped with both cellular and infrastructure-less air interfaces, allow integration of the two separate paradigms. The paper reports results achieved through a mathematical analysis of the topology of wireless links, providing the distribution of the number of lowest-level nodes attached to the highest level. Nodes have a maximum capacity, and seek service at the upper level through a retry mechanism where the nodes are addressed according to a ranked list based on the level of received power. The mathematical analysis provides a means to allow access control, depending on the maximum number of radio resource units available at each node and the maximum number of retries at each level. Wireless nodes at different levels are uniformly distributed over the bi-dimensional plane with different densities; path loss and shadowing are included with different propagation parameters, different air interfaces are used, and different hard capacities characterise the nodes at the different levels. With respect to other papers recently presented by the authors to other conferences, this work focuses on the role of the node capacity limitations and the maximum number of retries","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127032550","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254016
P. Kuo, Peter J. Smith
In this paper, we are interested in evaluating the probability of adaptation error (PAE) in MIMO systems using adaptive modulation or transmission rate. We attack the problem from two distinct perspectives. Firstly, for a certain rate-feedback system, the PAE is computed by building a Markov model for the channel capacity. The transition probabilities between rate states during the feedback period are approximated using a novel analytical result for the level crossing rate (LCR) of MIMO capacity. Secondly, the impact of channel estimation error on adaptive modulation over eigenmodes is considered. By utilizing the joint dynamic statistics of the eigenvalues, the instantaneous probabilities of choosing inappropriate modulation schemes can be calculated
{"title":"On the Probability of Adaptation Error in MIMO Systems","authors":"P. Kuo, Peter J. Smith","doi":"10.1109/PIMRC.2006.254016","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254016","url":null,"abstract":"In this paper, we are interested in evaluating the probability of adaptation error (PAE) in MIMO systems using adaptive modulation or transmission rate. We attack the problem from two distinct perspectives. Firstly, for a certain rate-feedback system, the PAE is computed by building a Markov model for the channel capacity. The transition probabilities between rate states during the feedback period are approximated using a novel analytical result for the level crossing rate (LCR) of MIMO capacity. Secondly, the impact of channel estimation error on adaptive modulation over eigenmodes is considered. By utilizing the joint dynamic statistics of the eigenvalues, the instantaneous probabilities of choosing inappropriate modulation schemes can be calculated","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127493986","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254374
L. Anttila, M. Valkama, M. Renfors
When targeting receiver integrability and flexibility, the choice of the front-end architecture is in key position. Instead of the traditional superheterodyne architecture, more recent I/Q or quadrature receiver front-ends are receiving increasingly more interest. One crucial aspect in quadrature receiver front-ends is the amplitude and phase matching of the analog I and Q signal branches. I/Q mismatches result in incomplete image signal or mirror frequency attenuation which must be enhanced using additional analog or digital signal processing. This paper presents and analyzes a novel DSP-based blind (non-data-aided) technique for I/Q imbalance compensation, utilizing a property of the ideal baseband equivalent called circularity. The weights of the compensator are computed directly from the estimates of the second-order moments of the mismatched baseband equivalent received signal. This algorithm is further simplified, with minimal loss in performance, yielding an extraordinarily simple yet effective compensation technique which ideally triples the dB value of the analog front-end image rejection ratio. The algorithms are applicable to any I/Q receiver structure, whether single-channel or multi-channel, and are in fact totally independent of any specific structure or characteristic (other than circularity) of the ideal baseband equivalent signal
{"title":"Blind Moment Estimation Techniques for I/Q Imbalance Compensation in Quadrature Receivers","authors":"L. Anttila, M. Valkama, M. Renfors","doi":"10.1109/PIMRC.2006.254374","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254374","url":null,"abstract":"When targeting receiver integrability and flexibility, the choice of the front-end architecture is in key position. Instead of the traditional superheterodyne architecture, more recent I/Q or quadrature receiver front-ends are receiving increasingly more interest. One crucial aspect in quadrature receiver front-ends is the amplitude and phase matching of the analog I and Q signal branches. I/Q mismatches result in incomplete image signal or mirror frequency attenuation which must be enhanced using additional analog or digital signal processing. This paper presents and analyzes a novel DSP-based blind (non-data-aided) technique for I/Q imbalance compensation, utilizing a property of the ideal baseband equivalent called circularity. The weights of the compensator are computed directly from the estimates of the second-order moments of the mismatched baseband equivalent received signal. This algorithm is further simplified, with minimal loss in performance, yielding an extraordinarily simple yet effective compensation technique which ideally triples the dB value of the analog front-end image rejection ratio. The algorithms are applicable to any I/Q receiver structure, whether single-channel or multi-channel, and are in fact totally independent of any specific structure or characteristic (other than circularity) of the ideal baseband equivalent signal","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129975023","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254474
Sebastian Max, Yunpeng Zang, Hans-Jürgen Reumerman
Simulation is one possibility to assess the performance of new medium access protocols for wireless communications. While the new algorithms are usually implemented in a very realistic way, the physical layer is emulated as a simple model. Often, this simplification is invalid in complex scenarios, where interference and non line of sight conditions degrade the signal quality. A complete physical layer implementation including the error correction, modulation, channel equalization and different channel pulse responses is not feasible in a layer two simulator. Hence, its characteristic is mapped onto a computational efficient stochastical model. The presented method differs from other error models in the way it is enriched with data to compute the packet error rates: The physical layer under examination, the WiMedia OFDM ultra wideband physical layer, is simulated in a detailed physical simulator and the error rates are derived then using an error analysis
{"title":"OFDM-UWB Physical Layer Emulation for Event-Based MAC Simulation","authors":"Sebastian Max, Yunpeng Zang, Hans-Jürgen Reumerman","doi":"10.1109/PIMRC.2006.254474","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254474","url":null,"abstract":"Simulation is one possibility to assess the performance of new medium access protocols for wireless communications. While the new algorithms are usually implemented in a very realistic way, the physical layer is emulated as a simple model. Often, this simplification is invalid in complex scenarios, where interference and non line of sight conditions degrade the signal quality. A complete physical layer implementation including the error correction, modulation, channel equalization and different channel pulse responses is not feasible in a layer two simulator. Hence, its characteristic is mapped onto a computational efficient stochastical model. The presented method differs from other error models in the way it is enriched with data to compute the packet error rates: The physical layer under examination, the WiMedia OFDM ultra wideband physical layer, is simulated in a detailed physical simulator and the error rates are derived then using an error analysis","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131027813","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.254029
R. Funada, H. Harada, M. Otani
3.4-4.2 and 4.4-4.9 GHz microwave bands are regarded as promising candidates in the possible frequency bands that can be assigned to the 4G mobile communication systems. In order to contribute to the frequency allocation, we conducted radio propagation experiments by use of 3.35 GHz carrier frequency in macro-cellular environments. For the experiments, we developed a measurement system calculating received signal power and delay power profiles by employing 215-1 PN sequences with a sampling rate of 160 Msample/s, which enables the high accuracy of radio propagation measurements. This paper describes an outline of the radio propagation experiments, and presents the results of rms delay spread distribution, in addition to the evaluation of two propagation models: Walfisch-Ikegami (WI) and extended WI models
{"title":"Measurement of 3GHz-band Radio Propagation in Macro Cellular Environments","authors":"R. Funada, H. Harada, M. Otani","doi":"10.1109/PIMRC.2006.254029","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254029","url":null,"abstract":"3.4-4.2 and 4.4-4.9 GHz microwave bands are regarded as promising candidates in the possible frequency bands that can be assigned to the 4G mobile communication systems. In order to contribute to the frequency allocation, we conducted radio propagation experiments by use of 3.35 GHz carrier frequency in macro-cellular environments. For the experiments, we developed a measurement system calculating received signal power and delay power profiles by employing 215-1 PN sequences with a sampling rate of 160 Msample/s, which enables the high accuracy of radio propagation measurements. This paper describes an outline of the radio propagation experiments, and presents the results of rms delay spread distribution, in addition to the evaluation of two propagation models: Walfisch-Ikegami (WI) and extended WI models","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130655872","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 : 2006-12-11DOI: 10.1109/PIMRC.2006.253976
Y. Shimizu, F. Nuno
Ubiquitous wireless networks and wireless sensor networks, which consist of access points and a number of wireless terminals with simple functions, provide users with a wide range of applications such as environment monitoring and traffic surveillance. In these networks, even though each terminal sends only small data amounts at comparatively long transmission intervals, traffic loads are significant due to the very large number of terminals. The access point must be capable of accommodating the great many wireless terminals, while providing high throughput performance. This can be achieved by employing DSA, a typical centralized media access control scheme, since it has high resource utilization efficiency. In this paper, we propose a novel DSA scheme that employs both a polling-based method and a random access method; it improves throughput by using the feature that most terminals tend to send data periodically. In this scheme, the access point polls the terminals to decrease the random accesses made by the terminals as much as possible. Simulations verify that the proposed scheme offers better throughput performance than the conventional scheme
{"title":"Performance Evaluation of Novel DSA Scheme that Combines Polling Method with Random Access Method","authors":"Y. Shimizu, F. Nuno","doi":"10.1109/PIMRC.2006.253976","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.253976","url":null,"abstract":"Ubiquitous wireless networks and wireless sensor networks, which consist of access points and a number of wireless terminals with simple functions, provide users with a wide range of applications such as environment monitoring and traffic surveillance. In these networks, even though each terminal sends only small data amounts at comparatively long transmission intervals, traffic loads are significant due to the very large number of terminals. The access point must be capable of accommodating the great many wireless terminals, while providing high throughput performance. This can be achieved by employing DSA, a typical centralized media access control scheme, since it has high resource utilization efficiency. In this paper, we propose a novel DSA scheme that employs both a polling-based method and a random access method; it improves throughput by using the feature that most terminals tend to send data periodically. In this scheme, the access point polls the terminals to decrease the random accesses made by the terminals as much as possible. Simulations verify that the proposed scheme offers better throughput performance than the conventional scheme","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"21 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132974399","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}
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