2011 Third International Workshop on Cross Layer Design最新文献

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SAFH - Smooth Adaptive Frequency Hopping 平滑自适应跳频

2011 Third International Workshop on Cross Layer Design Pub Date : 2011-11-01 DOI: 10.1109/IWCLD.2011.6123078

Sami Ben Cheikh, Tim Esemann, H. Hellbruck

{"title":"SAFH - Smooth Adaptive Frequency Hopping","authors":"Sami Ben Cheikh, Tim Esemann, H. Hellbruck","doi":"10.1109/IWCLD.2011.6123078","DOIUrl":"https://doi.org/10.1109/IWCLD.2011.6123078","url":null,"abstract":"Wireless systems based on WLAN (802.11), ZigBee (802.15.4) and Bluetooth (802.15.1) are continuously deployed in new applications covering consumer, industry or medical fields. Especially, Bluetooth is recommended by the Health-Care-Organization for medical applications as frequency hopping is considered as a robust scheme. However dealing with frequency-dynamic sources of interference in the 2.4GHz ISM band is important due to the increase of wireless devices. Adaptive frequency hopping (AFH) suggested by the Bluetooth standard and implemented in many of todays products identifies and avoids using bad channels. It is a good and established coexistence mechanism in the presence of frequency-static sources of interference such as WLANs when the 2.4GHz band is not crowded. However, AFH is facing problems in a crowded 2.4GHz band, especially when the interference is dynamic. We developed a cross-layer algorithm SAFH (Smooth Adaptive Frequency Hopping) that is inspired by entropy maximization and the conventional Bluetooth AFH. SAFH assigns usage probabilities to all channels based on an exponential smoothing filter for frame error rates to estimate and predict the channel conditions. The application layer can adapt SAFH by parameter settings in a cross-layer approach. SAFH achieves low average frame error rate and responds fast to changing channel conditions if required from the application. Simulative Evaluation in the presence of different types of interference (802.11b, 802.15.4 and 802.15.1) shows that our algorithm outperforms conventional frequency hopping and AFH. Additionally, SAFH works smoothly and stable exploiting frequency diversity compared to previous approaches like entropy-maximization based adaptive frequency hopping and Utility Based Adaptive Frequency Hopping (UBAFH).","PeriodicalId":149596,"journal":{"name":"2011 Third International Workshop on Cross Layer Design","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116404469","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: 18

A cross-layer approach to clustering and relay assignment based on Vehicle Routing Problem 基于车辆路由问题的跨层聚类和中继分配方法

2011 Third International Workshop on Cross Layer Design Pub Date : 2011-11-01 DOI: 10.1109/IWCLD.2011.6123080

Amir Minayi Jalil, V. Meghdadi, J. Cances

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引用次数: 1

Effect of initial states on statistical time-access fairness index of one-bit feedback fair scheduler 初始状态对bit反馈公平调度统计时访问公平指标的影响

2011 Third International Workshop on Cross Layer Design Pub Date : 2011-08-23 DOI: 10.1145/2021216.2021225

F. Ishizaki

引用次数: 2

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