Yanru Wang, K. K. Chai, Yue Chen, J. Schormans, J. Loo
{"title":"Energy-aware Restricted Access Window control with retransmission scheme for IEEE 802.11ah (Wi-Fi HaLow) based networks","authors":"Yanru Wang, K. K. Chai, Yue Chen, J. Schormans, J. Loo","doi":"10.1109/WONS.2017.7888774","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888774","url":null,"abstract":"Restricted Access Window (RAW) has been introduced to IEEE 802.11ah MAC layer to decrease collision probability. However, the inappropriate application of RAW for different groups of devices would increase uplink energy consumption and decrease data rate. In this paper, we study an energy efficient RAW optimization problem for IEEE 802.11ah based uplink communications. We first present a novel retransmission scheme that utilizes the next empty slot to retransmit for collided devices, and formulate the problem based on overall energy consumption and the data rate of each RAW by applying probability theory and Markov Chain. Then, we derive the energy efficiency of the uplink transmission. Last but not the least, an energy-aware window control algorithm to adapt the RAW size is proposed to optimize the energy efficiency by identifying the number of slots in each RAW for different group scales. Simulation results show that our proposed algorithm outperforms existing RAW on uplink energy efficiency and delivery ratio.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129313092","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}
David Rodenas-Herráiz, Paul R. A. Fidler, Tao Feng, Xiaomin Xu, S. Nawaz, K. Soga
{"title":"A handheld diagnostic system for 6LoWPAN networks","authors":"David Rodenas-Herráiz, Paul R. A. Fidler, Tao Feng, Xiaomin Xu, S. Nawaz, K. Soga","doi":"10.1109/WONS.2017.7888754","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888754","url":null,"abstract":"The successful deployment of low-power wireless sensor networks (WSNs) in real application environments is a much broader exercise than just the simple instrumentation of the intended monitoring site. Many problems, from node malfunctions to connectivity issues, may arise during commissioning of these networks. These need to be corrected on the spot, often within limited time, to avoid undesired delays in commissioning and yet a fully functional system does not guarantee that no new problems will occur after leaving the site. In this paper we present the first ever (to our knowledge) implementation of a handheld diagnostic system for fast on-site commissioning of low-power IPv6 (6LoWPAN) WSNs as well as troubleshooting of network problems during and after deployment. This system can be used where traditional solutions are insufficient to ascertain the root causes of any problems encountered at no additional complexity in the implementation of the WSN. The embedded diagnosis capability in our system is based on a lightweight decision tree that distills the functioning of communication protocols in use by the network, with a major focus on interoperable IPv6 standards and protocols for low-power WSNs. To show the applicability of our system, we present a set of experiments based on results from a real deployment in a large construction site. Through these experiments, important performance insights are gained that can be used as guidelines for improvement of operation and maintenance of 6LoWPAN networks.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128632771","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}
J. Ott, Ljubica Kärkkäinen, Ermias Andargie Walelgne, A. Keränen, Esa Hyytiä, J. Kangasharju
{"title":"On the sensitivity of geo-based content sharing to location errors","authors":"J. Ott, Ljubica Kärkkäinen, Ermias Andargie Walelgne, A. Keränen, Esa Hyytiä, J. Kangasharju","doi":"10.1109/WONS.2017.7888691","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888691","url":null,"abstract":"A number of opportunistic content sharing services were developed that exploit device-to-device contacts for infrastructure-less operation. All of them depend, like geo-based ad-hoc routing protocols, on mobile devices knowing their respective positions to accurately perform data replication. In this paper, we explore the impact of different types of location errors on the performance of such a service. We use a GPS error distribution for mobiles derived from real-world measurements, consider different frequencies for GPS readings, and account for only subsets of mobile devices actively using GPS. We carry out extensive simulation studies using synthetic mobility models as well as real-world traces to assess the impact of different types of errors. We find that, overall, opportunistic content sharing is quite robust provided that a sufficient number of nodes support GPS and allow the others to have a rough estimate of where they are. Whether or not the GPS position is prone to errors affects some scenarios and is almost negligible in others.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132821231","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 dynamic and autonomous channel selection strategy for interference avoidance in 802.11","authors":"Francesco Maturi, F. Gringoli, R. Cigno","doi":"10.1109/WONS.2017.7888756","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888756","url":null,"abstract":"The coexistence of different technologies within the same spectrum swaths, as well as the distributed, non-coordinated channel assignment for WLANs is becoming not only an important research topic, but also a matter of sustainability for the trend we witness in moving all last-hop communications on wireless links to unleash the users from their wires and tethers. This work proposes, implements and evaluates a strategy that allows an entire 802.11 Basic Service Set (BSS) to dynamically hop between the available channels always selecting the “best” one. The selection not only guarantees the hopping BSS performances well above what can be achieved with a static selection, but it also minimizes the interference toward other BSSs, so that the overall performance of the system maximizes resource utilization. The performance of the protocol and strategy we propose is tested with an implementation on off-the-shelf 802.11g cards; the experiments are run in labs and around the campus of the University of Trento.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123115670","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}
Harith Kharrufa, H. Al-Kashoash, Yaarob Al-Nidawi, Maria Quezada Mosquera, A. Kemp
{"title":"Dynamic RPL for multi-hop routing in IoT applications","authors":"Harith Kharrufa, H. Al-Kashoash, Yaarob Al-Nidawi, Maria Quezada Mosquera, A. Kemp","doi":"10.1109/WONS.2017.7888753","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888753","url":null,"abstract":"The Routing Protocol for Low Power and Lossy Networks (RPL) has become the standard routing protocol for the Internet of Things (IoT). This paper investigates the use of RPL in dynamic networks and presents an enhanced RPL for different applications with dynamic mobility and diverse network requirements. This implementation of RPL is designed with a new dynamic Objective-Function (D-OF) to improve the Packet Delivery Ratio (PDR), end-to-end delay and energy consumption while maintaining low packet overhead and loop-avoidance. We propose a controlled reverse-trickle timer based on received signal strength identification (RSSI) readings to maintain high responsiveness with minimum overhead and consult the objective function when a movement or an inconsistency is detected to help nodes make an informed decision. Simulations are done using Cooja with random waypoint mobility scenario for healthcare applications considering multi-hop routing. The results show that the proposed dynamic RPL (D-RPL) adapts to the nodes mobility and has a higher PDR, slightly lower end-to-end delay and reasonable energy consumption compared to related existing protocols.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130886839","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}
Nouman Ashraf, Waqar Asif, H. K. Qureshi, M. Lestas
{"title":"Active energy management for harvesting enabled wireless sensor networks","authors":"Nouman Ashraf, Waqar Asif, H. K. Qureshi, M. Lestas","doi":"10.1109/WONS.2017.7888757","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888757","url":null,"abstract":"In this work, we propose a novel control based scheme for energy management in wireless sensor networks with energy harvesting capability. The problem is viewed as a queue control problem where the objective is to maintain a reference energy level of the energy storage device. A validated nonlinear queueing model is considered and a robust nonlinear controller is considered whose convergence properties are established analytically. The proposed control algorithm incorporates predictions of the energy to be harvested which are generated using the recently proposed Accurate Solar Irradiance Prediction Model (ASIM). The combined control and prediction scheme is evaluated using analysis and simulations. Preliminary simulation results conducted on the NS-3 simulator demonstrate the ability of the scheme to achieve its design objective as the energy level oscillates about values close to the desired level.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114432144","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":"On the application of LoRa LPWAN technology in Sailing Monitoring System","authors":"Lingling Li, Jiuchun Ren, Qian Zhu","doi":"10.1109/WONS.2017.7888762","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888762","url":null,"abstract":"Sailing Monitoring System operating in the sea area has the basic transmission requirement of low power and long range. LoRa Low Power Wide Area Network (LPWAN) technology can be seen as an alternative solution to address this problem. This study focuses on transmission performance of LoRa technology and attempts to apply LoRa technology to Sailing Monitoring System. Experiments of LoRa technology parameters' (e.g. spread factor and bandwidth) influences on data transmission time and coverage were set up. Then, the optimal parameters of LoRa technology are used in Sailing Monitoring System, and the evaluation of system's performances is given. The measurements were conducted in Brazil Olympics sailing venue for two cases, and system's performance of coverage and packet loss rate in sea area are analyzed. It shows that the system based on LoRa technology can achieve the intended purpose of system design and meet the basic requirement of system applications. In the concluding section, measurement results are summarized and the future research directions are presented.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122028561","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}
J. H. Ziegeldorf, Martin Henze, Jens Bavendiek, Klaus Wehrle
{"title":"TraceMixer: Privacy-preserving crowd-sensing sans trusted third party","authors":"J. H. Ziegeldorf, Martin Henze, Jens Bavendiek, Klaus Wehrle","doi":"10.1109/WONS.2017.7888771","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888771","url":null,"abstract":"Crowd-sensing promises cheap and easy large scale data collection by tapping into the sensing and processing capabilities of smart phone users. However, the vast amount of fine-grained location data collected raises serious privacy concerns among potential contributors. In this paper, we argue that crowd-sensing has unique requirements w.r.t. privacy and data utility which renders existing protection mechanisms infeasible. We hence propose TraceMixer, a novel location privacy protection mechanism tailored to the special requirements in crowd-sensing. TraceMixer builds upon the well-studied concept of mix zones to provide trajectory privacy while achieving high spatial accuracy. First in this line of research, TraceMixer applies secure two-party computation technologies to realize a trustless architecture that does not require participants to share locations with anyone in clear. We evaluate TraceMixer on real-world datasets to show the feasibility of our approach in terms of privacy, utility, and performance. Finally, we demonstrate the applicability of TraceMixer in a real-world crowd-sensing campaign.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133438898","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":"Unnecessary handover minimization in two-tier heterogeneous networks","authors":"Mohanad Alhabo, Li X. Zhang","doi":"10.1109/WONS.2017.7888692","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888692","url":null,"abstract":"Ultra-dense deployment of small cells (SC) can be foreseen in 5G network under the coverage area of the macrocell (MC). A mobile user equipment (UE) should be able to discover adjacent SCs to perform the handover (HO). This process can be done by frequent neighbour cell scanning. However, extensive scanning for every SC in a dense deployment scenario is a resource wasting strategy, which results in a power dissipation of the UE battery and also lowers the throughput gain. This also means that a high number of SCs would be available for the UE to HO to. Hence, the probability of unnecessary HO will increase and in turn degrade the UE's quality of service (QoS). This paper aims to minimize unnecessary HOs in two tier heterogeneous network with dense deployment of SCs. In the proposed method, we utilise the actual distance between the UE and the SCs and the UE angle of movement to construct a shortened candidate list which helps in reducing the signal overhead of scanning and the number of unnecessary HOs. UE's movement velocity threshold based on average human walking speed is used to control the HO to the SC. Simulation results show that the proposed algorithm outperformed the conventional HO method with reduced unnecessary HOs and increased throughput for the network particularly for medium to high speed UEs resulting in good UE QoS.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122969181","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}
Yasaman Ghasempour, N. Prasad, M. Khojastepour, S. Rangarajan
{"title":"Novel combinatorial results on downlink MU-MIMO scheduling with applications","authors":"Yasaman Ghasempour, N. Prasad, M. Khojastepour, S. Rangarajan","doi":"10.1109/WONS.2017.7888765","DOIUrl":"https://doi.org/10.1109/WONS.2017.7888765","url":null,"abstract":"In this paper we consider the classical problem of downlink (DL) multiuser (MU) multi-input-multi-output (MIMO) scheduling with linear transmit precoding. This problem was formulated over a decade ago and has been deeply studied since then. Moreover, MU-MIMO with linear transmit precoding is being increasingly pursued as a key technology by the industry, with a strong emphasis on efficient scheduling algorithms. However, the intractable combinatorial nature of the problem has mostly restricted algorithm design to the realm of simple greedy heuristics. Such algorithms do not exploit any underlying structure in the problem. Recently, it has been formally shown that in general this problem is even hard to approximate. Our significant contribution in this work is to consider the practically most important choices of linear precoding and power allocation and show that the resulting problems can be cast as ones where a difference of two submodular set functions has to be maximized. This opens up a new framework for MU-MIMO scheduler design. We use this framework to design an algorithm and demonstrate that significant gains can be achieved at a reasonable complexity. Our framework can also incorporate analog receive beamforming which is deemed to be essential in mmWave MIMO systems.","PeriodicalId":110653,"journal":{"name":"2017 13th Annual Conference on Wireless On-demand Network Systems and Services (WONS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126915523","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}