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- posterNovember 2024
Poster: Estimating Cell Load from End-user Crowdsourced Measurements in a Real-world Cellular Network
IMC '24: Proceedings of the 2024 ACM on Internet Measurement ConferencePages 757–758https://doi.org/10.1145/3646547.3689665Optimizing mobile networks in the rapidly evolving field of wireless communication is increasingly challenging due to two main issues associated with current methods. First, the technical complexity of the Radio Access Network (RAN) with multiple ...
- keynoteMay 2022
Cellular Security: Why is it difficult?
ASIA CCS '22: Proceedings of the 2022 ACM on Asia Conference on Computer and Communications SecurityPage 392https://doi.org/10.1145/3488932.3522770In the last 10 years, I have been working on various cellular security problems publishing more than 10 papers. The topics include privacy [1, 5, 11], accounting [2, 3, 4], service security [3], Middleboxes and IPV6 [4], automatic performance analysis [...
- posterMay 2022
Passive Drone Localization Using LTE Signals
WiSec '22: Proceedings of the 15th ACM Conference on Security and Privacy in Wireless and Mobile NetworksPages 295–297https://doi.org/10.1145/3507657.3529658Drones raise significant privacy and security threats, by intruding into the airspace of private properties or unauthorized regions. Being able to detect and localize the encroaching drones is essential to build geofencing systems to prevent drone ...
- research-articleNovember 2021
QCI Adaptive Load Balancing in Heterogeneous Wireless Networks of Indoor Environments
Q2SWinet '21: Proceedings of the 17th ACM Symposium on QoS and Security for Wireless and Mobile NetworksPages 11–16https://doi.org/10.1145/3479242.3487311Compatibility and wide availability of WLAN make its integration with 3GPP-based networks (LTE, 5G), the most cost efficient solution to meet high service demands and ubiquitous radio coverage. In a heterogeneous network, seamless mobility, provisioning ...
- research-articleNovember 2021
Performance Evaluation of Cooperative LTE-DSRC Vehicular Network
PE-WASUN '21: Proceedings of the 18th ACM Symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, & Ubiquitous NetworksPages 25–32https://doi.org/10.1145/3479240.3488528Intelligent Transport Systems (ITS) are fundamental to reaching the concept of smart cities. However, the incoming development of vehicular applications will originate an increase in long-term evolution (LTE) traffic demand, so an approach consists of ...
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- research-articleOctober 2019
Experiences: Design, Implementation, and Deployment of CoLTE, a Community LTE Solution
MobiCom '19: The 25th Annual International Conference on Mobile Computing and NetworkingArticle No.: 45, Pages 1–16https://doi.org/10.1145/3300061.3345446In this paper we introduce CoLTE, a solution for LTE-based community networks. CoLTE is a lightweight, Internet-only LTE core network (EPC) designed to facilitate the deployment and operation of small-scale, community owned and operated LTE networks in ...
- demonstrationOctober 2019
Demo: An All-in-One Community LTE Network
MobiCom '19: The 25th Annual International Conference on Mobile Computing and NetworkingArticle No.: 68, Pages 1–3https://doi.org/10.1145/3300061.3343371We will introduce and demonstrate CoLTE, an all-in-one solution for LTE-based community networks. CoLTE is a lightweight, Internet-only LTE core network (EPC) based on OpenAirInterface. CoLTE is designed to facilitate the deployment and operation of ...
- posterOctober 2019
Poster: Characterizing Performance and Power for mmWave 5G on Commodity Smartphones
S3'19: Proceedings of the 2019 on Wireless of the Students, by the Students, and for the Students WorkshopPage 14https://doi.org/10.1145/3349621.3355729During the first half of this year, three major operators in the US have announced their 5G deployment, which indicates the advent of next generation networks. To reduce the time to market, carriers utilize 5G NR for data plane operations while ...
- research-articleAugust 2019
An Active-Passive Measurement Study of TCP Performance over LTE on High-speed Rails
- Jing Wang,
- Yufan Zheng,
- Yunzhe Ni,
- Chenren Xu,
- Feng Qian,
- Wangyang Li,
- Wantong Jiang,
- Yihua Cheng,
- Zhuo Cheng,
- Yuanjie Li,
- Xiufeng Xie,
- Yi Sun,
- Zhongfeng Wang
MobiCom '19: The 25th Annual International Conference on Mobile Computing and NetworkingArticle No.: 18, Pages 1–16https://doi.org/10.1145/3300061.3300123High-speed rail (HSR) systems potentially provide a more efficient way of door-to-door transportation than airplane. However, they also pose unprecedented challenges in delivering seamless Internet service for on-board passengers. In this paper, we ...
- demonstrationJune 2019
CASTLE over the Air -- Distributed Scheduling for Cellular Data Transmissions (demo)
- Sandesh Dhawaskar Sathyanarayana,
- Jihoon Lee,
- Jinsung Lee,
- Youngbin Im,
- Parisa Rahimzadeh,
- Xiaoxi Zhang,
- Max Hollingsworth,
- Carlee Joe-Wong,
- Dirk Grunwald,
- Sangtae Ha
MobiSys '19: Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and ServicesPages 673–674https://doi.org/10.1145/3307334.3328576We present the demonstration of a fully distributed scheduling framework called CASTLE (Client-side Adaptive Scheduler That minimizes Load and Energy) that jointly optimizes the spectral efficiency of cellular networks and battery consumption of smart ...
- demonstrationJune 2019
This is Your President Speaking: Spoofing Alerts in 4G LTE Networks (demo)
- Max Hollingsworth,
- Gyuhong Lee,
- Jihoon Lee,
- Jinsung Lee,
- Youngbin Im,
- Eric Wustrow,
- Dirk Grunwald,
- Sangtae Ha
MobiSys '19: Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and ServicesPages 663–664https://doi.org/10.1145/3307334.33285724G LTE networks across the world (e.g., United States, Europe, and South Korea) use the same mechanism to broadcast emergency alerts. These alerts include AMBER, severe weather alerts, and the (unblockable) Presidential Alert in the US. We demonstrate ...
- research-articleJune 2019
CASTLE over the Air: Distributed Scheduling for Cellular Data Transmissions
- Jihoon Lee,
- Jinsung Lee,
- Youngbin Im,
- Sandesh Dhawaskar Sathyanarayana,
- Parisa Rahimzadeh,
- Xiaoxi Zhang,
- Max Hollingsworth,
- Carlee Joe-Wong,
- Dirk Grunwald,
- Sangtae Ha
MobiSys '19: Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and ServicesPages 417–429https://doi.org/10.1145/3307334.3326086This paper presents a fully distributed scheduling framework called CASTLE (Client-side Adaptive Scheduler That minimizes Load and Energy), which jointly optimizes the spectral efficiency of cellular networks and battery consumption of smart devices. To ...
- research-articleJune 2019
This is Your President Speaking: Spoofing Alerts in 4G LTE Networks
- Gyuhong Lee,
- Jihoon Lee,
- Jinsung Lee,
- Youngbin Im,
- Max Hollingsworth,
- Eric Wustrow,
- Dirk Grunwald,
- Sangtae Ha
MobiSys '19: Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and ServicesPages 404–416https://doi.org/10.1145/3307334.3326082Modern cell phones are required to receive and display alerts via the Wireless Emergency Alert (WEA) program, under the mandate of the Warning, Alert, and Response Act of 2006. These alerts include AMBER alerts, severe weather alerts, and (unblockable) ...
- research-articleFebruary 2019
Towards Self-Driving Radios: Physical-Layer Control using Deep Reinforcement Learning
HotMobile '19: Proceedings of the 20th International Workshop on Mobile Computing Systems and ApplicationsPages 69–74https://doi.org/10.1145/3301293.3302374Modern radios, such as 5G New Radio, feature a large set of physical-layer control knobs in order to support an increasing number of communication scenarios spanning multiple use cases, device categories and wireless environments. The challenge however ...
- research-articleOctober 2018Best Paper
SkyCore: Moving Core to the Edge for Untethered and Reliable UAV-based LTE Networks
MobiCom '18: Proceedings of the 24th Annual International Conference on Mobile Computing and NetworkingPages 35–49https://doi.org/10.1145/3241539.3241549The advances in unmanned aerial vehicle (UAV) technology have empowered mobile operators to deploy LTE base stations (BSs) on UAVs, and provide on-demand, adaptive connectivity to hotspot venues as well as emergency scenarios. However, today's evolved ...
- ArticleDecember 2017
QoE Metric Based Resource Allocation for Dynamic Adaptive Streaming over HTTP in LTE Networks
MOBIMEDIA'17: Proceedings of the 10th EAI International Conference on Mobile Multimedia CommunicationsPages 297–301https://doi.org/10.4108/eai.13-7-2017.2270548Dynamic Adaptive Streaming over HTTP (DASH) is the main business mode of video service because of its convenient deployment, low cost, and adaptability to different user requirements. Meanwhile Quality of Experience (QoE) has become the main evaluation ...
- ArticleDecember 2017
An Improved Model based on Viewer Response to Time-varying Video Quality for Video Telephony over LTE
MOBIMEDIA'17: Proceedings of the 10th EAI International Conference on Mobile Multimedia CommunicationsPages 321–328https://doi.org/10.4108/eai.13-7-2017.2270097The advent of LTE network’s full deployment has led to a proliferation of mobile video services due to the greatly improved network conditions. One area of intense research is video telephony. Apparently operators are highly concerned about the quality ...
- ArticleDecember 2017
The Listen before Talk based coexistence performance analysis over the unlicensed spectrum under multiple LTE small bases
MOBIMEDIA'17: Proceedings of the 10th EAI International Conference on Mobile Multimedia CommunicationsPages 53–56https://doi.org/10.4108/eai.13-7-2017.2270045oAn analytical model is proposed to evaluate the Listen Before Talk (LBT) based coexistence scheme over the unlicensed spectrum under multiple LTE small bases (SBSs). Based on the proposed model, the expressions of the occupancy time of the LTE/WiFi/...
- research-articleNovember 2017
System Level Evaluation and Validation of the ns-3 LTE Module in 3GPP Reference Scenarios
Q2SWinet '17: Proceedings of the 13th ACM Symposium on QoS and Security for Wireless and Mobile NetworksPages 59–64https://doi.org/10.1145/3132114.3132117LTE networks represent the latest generation implementation of communications technologies for mobile users. As such, simulation tools are essential in the development of new radio resource management (RRM) techniques for LTE. In this paper, we evaluate ...
- research-articleNovember 2017
Modular Redundancy for Cloud based IMS Robustness
MobiWac '17: Proceedings of the 15th ACM International Symposium on Mobility Management and Wireless AccessPages 75–82https://doi.org/10.1145/3132062.3132064IMS (IP Multimedia Subsystem) is an emerging architectural framework that delivers a number of multimedia services -- ranging from voice/video over LTE, interactive gaming and many more -- in operational LTE network. Network operators are embracing ...