{"title":"A Hybrid Energy-Aware Video Bitrate Adaptation Algorithm for Mobile Networks","authors":"Fábio Araújo, D. Rosário, E. Cerqueira, L. Villas","doi":"10.23919/WONS.2019.8795455","DOIUrl":"https://doi.org/10.23919/WONS.2019.8795455","url":null,"abstract":"The number of mobile devices that use video streaming applications has been steadily rising year after year. Platforms responsible for providing multimedia service face great challenges in delivering high-quality content for mobile users. One main problem in sharing video flows is the high energy consumption in mobile devices, which reduces their lifetime. A video adaptation approach with Quality of Experience (QoE) support is a key issue to increase the user experience while watching videos as well as reduce the energy consumption in mobile devices. In this paper, we propose a hybrid energy-aware video bitrate adaptation algorithm to deliver videos with high QoE and energy-efficiency for mobile users. Simulation results show the efficiency of the proposed algorithm compared to existing adaptation video bitrate algorithms, reducing the number and duration of stalls, as well as saving energy.","PeriodicalId":185451,"journal":{"name":"2019 15th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128262849","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}
{"title":"Experimental Evaluation of Precision of a Proximity-based Indoor Positioning System","authors":"S. T. Kouyoumdjieva, G. Karlsson","doi":"10.23919/WONS.2019.8795488","DOIUrl":"https://doi.org/10.23919/WONS.2019.8795488","url":null,"abstract":"Bluetooth Low Energy beacons are small transmitters with long battery life that are considered for providing proximity-based services. In this work we evaluate experimentally the performance of a proximity-based indoor positioning system built with off-the-shelf beacons in a realistic environment. We demonstrate that the performance of the system depends on a number of factors, such as the distance between the beacon and the mobile device, the positioning of the beacon as well as the presence and positioning of obstacles such as human bodies. We further propose an online algorithm based on moving average forecasting and evaluate the algorithm in the presence of human mobility. We conclude that algorithms for proximity-based indoor positioning must be evaluated in realistic scenarios, for instance considering people and traffic on the used radio bands. The uncertainty in positioning is high in our experiments and hence the success of commercial context-aware solutions based on BLE beacons is highly dependent on the accuracy required by each application.","PeriodicalId":185451,"journal":{"name":"2019 15th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114867559","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}
{"title":"Grant-Free Access with Multipacket Reception: Analysis and Reinforcement Learning Optimization","authors":"Augustin Jacquelin, Mikhail Vilgelm, W. Kellerer","doi":"10.23919/WONS.2019.8795459","DOIUrl":"https://doi.org/10.23919/WONS.2019.8795459","url":null,"abstract":"Grant-free access has been identified by 3GPP as a potential solution for Industrial Internet-of-Things applications in 5G networks. It allows to decrease overhead and delay, but it is also prone to collisions in the high-load regime. To reduce the effects of collisions, Non-Orthogonal Multiple Access or other Successive Interference Cancellation (SIC) protocols can be applied, allowing to partially recover collisions. In this paper, we abstract the grant-free access protocols with SIC with a $K$-Multipacket Reception ($K$-MPR) model. Based on this abstraction, we analyze its one-frame and steady-state throughput, delay and failure probability under different backoff schemes. Furthermore, we propose a reinforcement learning approach to allocate grant-free resources dynamically in order to maximize the normalized throughput of the protocol. Monte-Carlo simulations are employed to confirm the accuracy of analytical results and to evaluate the throughput, delay, and reliability of the proposed resource allocation approach.","PeriodicalId":185451,"journal":{"name":"2019 15th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124896369","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}
{"title":"A Decentralize Algorithm for Perturbation Minimization in 5G D2D Communication","authors":"Subhankar Ghosal, Sasthi C. Ghosh","doi":"10.23919/WONS.2019.8795481","DOIUrl":"https://doi.org/10.23919/WONS.2019.8795481","url":null,"abstract":"In 5G device to device (D2D) communication, two users residing in close proximity can directly communicate among themselves without the need of a base station. Such a communicating pair of users forms a D2D link which operates on a common channel. Suppose $Y$ dedicated channels are available to support the D2D communications. Since channels are limited resources, we may have to reuse the same channel to multiple links in order to enhance the capacity. But if two links are interfering to each other, they cannot use the same channel to avoid co-channel interference. The interference constraints at a particular time instant $t$ can be modeled in terms of a graph $g(t)$ where each vertex represents a link and two vertices have an edge between them if their corresponding links are interfering to each other. At any time instant, a vertex must be assigned with a channel, otherwise the corresponding user pair can not communicate. Due to the movement of the users, a color/channel assigned at time $t-1$ may not be a valid coloring at time $t$. Hence we may have to recolor some vertices to satisfy the interference constraints. Our objective is to minimize the total number of such recoloring/perturbations $A(t)$ at time $t$. To minimize $A(t)$, we propose a decentralize differential coloring (DDC) algorithm and calculate the asymptotic bound on $A(t)$ produced by DDC. We also compare the value of $A(t)$ produced by DDC with other existing approaches. Results show that DDC produces less perturbations than the existing approaches. Theoretical results have also been validated through simulations.","PeriodicalId":185451,"journal":{"name":"2019 15th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134257997","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}