First International Conference on Wireless Internet (WICON'05)最新文献

Proposal of a base station diversity technique based on TCP performance 提出了一种基于TCP性能的基站分集技术

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.27

K. Naito, K. Mori, Hideo Kobayashi

{"title":"Proposal of a base station diversity technique based on TCP performance","authors":"K. Naito, K. Mori, Hideo Kobayashi","doi":"10.1109/WICON.2005.27","DOIUrl":"https://doi.org/10.1109/WICON.2005.27","url":null,"abstract":"The performance of TCP degrades rapidly in wireless communications environment, because TCP misunderstands the segment loss which is occurred by transmission errors as a network congestion. As improvement technique for TCP, we propose a new cellular system. In our proposed system, it supports a base station diversity technique, and a wireless terminal evaluates its own wireless environment and TCP performance. When the received signal power of a wireless terminal is small, the performance of TCP deteriorates under the influence of transmission errors. Then the wireless terminal with small received signal power connects to two or more base stations, in order to maintain the good performance of TCP. And it receives multiple frames of the same data from some base stations, and it performs the maximum likelihood ratio combining and decodes data. It seems that use of a base station diversity is effective also as a provision not only against decrease of received signal power but the fading, and the performance of TCP improve. In this paper, we evaluate the characteristics of TCP in the proposed base station diversity system, and it is shown clearly that the proposed system improves the performance of TCP greatly.","PeriodicalId":146688,"journal":{"name":"First International Conference on Wireless Internet (WICON'05)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126406643","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: 3

Transmission of VoIP traffic in multihop ad hoc IEEE 802.11b networks: experimental results 多跳自组织IEEE 802.11b网络中VoIP流量的传输:实验结果

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.34

Sergio Armenia, L. Galluccio, A. Leonardi, S. Palazzo

引用次数: 41

Energy-efficient wakeup scheduling for maximizing lifetime of IEEE 802.15.4 networks 实现IEEE 802.15.4网络寿命最大化的节能唤醒调度

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.14

Diba Mirza, M. Owrang, C. Schurgers

引用次数: 37

An opportunistic scheduler to balance performance measures and energy consumption in wireless networks: design and implementation 在无线网络中平衡性能度量和能耗的机会调度器:设计与实现

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.8

Yu Dong, David K. Y. Yau, John C.S. Lui

{"title":"An opportunistic scheduler to balance performance measures and energy consumption in wireless networks: design and implementation","authors":"Yu Dong, David K. Y. Yau, John C.S. Lui","doi":"10.1109/WICON.2005.8","DOIUrl":"https://doi.org/10.1109/WICON.2005.8","url":null,"abstract":"Energy management is critical for emerging tiny wireless mobile devices such as sensors and PDAs, which are power limited by the capacity of their batteries. The energy cost of wireless transmission is high, being superlinear in the communication distance. Even an idle node that is turned on but otherwise not engaged in any activity may consume a significant amount of energy. Based on the observation that reduced communication distance between two communicating parties can significantly reduce the energy cost of the communication, we propose a motion prediction algorithm that exploits the movement history of a sender node to predict the likelihood that the node may move closer to the receiver by a given deadline. If the likelihood is high, then the transmission is postponed until the mobile node moves closer to the receiver at a future time. To reduce unproductive energy use by an idle node, we propose a sleep/wakeup algorithm that adoptively puts the node into sleep mode. However, while a mobile node is sleeping, it may miss critical opportunities for position update and motion prediction. The objective of this paper is then to realize an opportunistic scheduler that can balance the energy consumption by an idle system and the performance of motion prediction in saving energy for network transmission. The proposed system has been prototyped on an actual sensor network platform. Experimental results show that our opportunistic scheduler can achieve significant energy savings in terms of both network communication and keeping the system awake as necessary.","PeriodicalId":146688,"journal":{"name":"First International Conference on Wireless Internet (WICON'05)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129928222","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

TCP-ELN: on the protocol aspects and performance of explicit loss notification for TCP over wireless networks TCP- eln:关于无线网络上TCP显式丢失通知的协议方面和性能

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.31

G. Buchholcz, T. Ziegler, T. V. Do

引用次数: 24

On the fidelity of IEEE 802.11 commercial cards 关于IEEE 802.11商用卡的保真度

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.23

A. D. Stefano, Alessandro Scaglione, G. Terrazzino, I. Tinnirello, V. Ammirata, L. Scalia, G. Bianchi, Giuseppe Costantino Giaconia

{"title":"On the fidelity of IEEE 802.11 commercial cards","authors":"A. D. Stefano, Alessandro Scaglione, G. Terrazzino, I. Tinnirello, V. Ammirata, L. Scalia, G. Bianchi, Giuseppe Costantino Giaconia","doi":"10.1109/WICON.2005.23","DOIUrl":"https://doi.org/10.1109/WICON.2005.23","url":null,"abstract":"The IEEE 802.11 DCF protocol is known to be fair in terms of long-term resource repartition among the contending stations. However, when considering real scenarios, where commercial 802.11 cards interact, very unpredictable as well as sometimes surprising behaviors emerge. Motivation of this paper is to investigate the reasons of the very evident disagreement between the theoretical IEEE 802.11 DCF protocol models and its practical implementations. In particular, we try to characterize the card behavior not only in terms of perceived throughput, but also in terms of low-level channel access operations. In fact, the simple throughput analysis does not allow to identify what affecting parameters, both in terms of transceivers architectures and MAC layer deployments, determine the performance differentiation among the cards. To this purpose, we implemented a tunable DCF network card, in which all MAC parameters are programmable and all the baseband signals are available, and we used this card as a probe instrument. We registered the low-level access operations of commercial cards in terms of access times revealed by the carrier sense function of our probe card. By comparing these times, we surprisingly proved that the most evident performance differences are not due to PHY layer issues, but to the MAC implementations, which often seem to do not respect the standard specifications.","PeriodicalId":146688,"journal":{"name":"First International Conference on Wireless Internet (WICON'05)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127126258","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: 24

Optimized multicast based on multipoint relaying 基于多点中继的优化组播

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.25

S. Cho, C. Adjih

{"title":"Optimized multicast based on multipoint relaying","authors":"S. Cho, C. Adjih","doi":"10.1109/WICON.2005.25","DOIUrl":"https://doi.org/10.1109/WICON.2005.25","url":null,"abstract":"Applications requiring the use of multicast such as military battlefield communication, rescue operations, conferencing, multi-user games, and context-aware applications, are becoming increasingly successful. To ensure broad popularization of these applications, they should be available regardless of time and place. Because wireless mobile ad hoc networks can automatically create a wide wireless network, which can extend an existing wired network, they are an ideal solution to support this concept of multicast, anytime, anywhere. To provide multicast services for mobile ad hoc networks, many protocols have been proposed. Their internal mechanisms are different but all protocols strive to achieve the same goal: efficient and reliable multicast packet delivery. However, there is often a trade-off between reliability and efficiency. Indeed, multicast packet delivery paths tend to become fragile with respect to mobility when they are optimized for bandwidth and become inefficient with respect to bandwidth when designed to be resilient to mobility. To improve the trade-off between efficiency and reliability, we use MPRs (multi point relays), the basic mechanism of OLSR for optimization, OLSR being one the main RFC in IETF Manet WG. Our approach is to build multicast delivery paths using MPRs to transmit multicast packets from multicast source to group members. Extensive simulation results shows that the proposed algorithm improves the reliability of multicasting without degrading noticeably the efficiency.","PeriodicalId":146688,"journal":{"name":"First International Conference on Wireless Internet (WICON'05)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127743392","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: 10

Interworking of cellular networks and hotspot wireless LANs via integrated accounting system 通过综合计费系统实现蜂窝网络和热点无线局域网的互通

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.17

T. Janevski, A. Tudzarov, P. Stojanovski, D. Temkov, G. Stojanov, D. Kantardziev, M. Pavlovski, T. Bogdanov

引用次数: 7

A comparison of HTB based channel-aware schedulers for 802.11 systems 802.11系统中基于HTB的通道感知调度器的比较

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.1

R. Garroppo, S. Giordano, S. Lucetti, G. Risi

{"title":"A comparison of HTB based channel-aware schedulers for 802.11 systems","authors":"R. Garroppo, S. Giordano, S. Lucetti, G. Risi","doi":"10.1109/WICON.2005.1","DOIUrl":"https://doi.org/10.1109/WICON.2005.1","url":null,"abstract":"The 802.11 commercial devices adopt a simple FIFO scheduler, which does not allow to isolate flows addressed to different destinations. This characteristic leads to the well-known performance anomaly of 802.11: when one or more STAs experiment poor radio channel conditions, they increase the time spent to transmit a single packet leading to an inefficient use of the shared medium. These phenomena have as a consequence the worsening of the performance of all the STAs sharing the wireless medium independently of their radio channel conditions. In this scenario, the paper proposes an architecture for a scheduling algorithm to implement in the AP for the downlink traffic, based on Hierarchical Token Bucket (HTB). The peculiarity of the proposed architecture is its ability to take into account, besides the transport service class required by the destination user, the channel quality experimented by the destination mobile STAtion (STA). Starting from this architecture two scheduling schemes are then proposed: the wireless HTB (WHTB) and the time-based WHTB (TWHTB). Both schemes are implemented in a prototype of AP. Hence, the performance of the proposed scheduling algorithms are experimentally evaluated and compared with those obtained with standard scheduling algorithm, which do not take into account information on channel quality. Finally, the paper presents a comparison in terms of implementation issues highlighted by the two proposed schemes, during the developing phase and the experimental analysis.","PeriodicalId":146688,"journal":{"name":"First International Conference on Wireless Internet (WICON'05)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127079247","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

A cross-layer optimization framework for multicast in multi-hop wireless networks 一种多跳无线网络多播跨层优化框架

First International Conference on Wireless Internet (WICON'05) Pub Date : 2005-07-10 DOI: 10.1109/WICON.2005.2

Jun Yuan, Zongpeng Li, Wei Yu, Baochun Li

引用次数: 72