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Open-source-based 5G Access Network Security Vulnerability Automated Verification Framework
Jewon Jung, Jaemin Shin, Sugi Lee, Yusung Kim
http://doi.org/10.5626/JOK.2023.50.6.531
Recently, various open sources based on 5G standards have emerged, and are widely used in research to find 5G control plane security vulnerabilities. However, leveraging those open sources requires extensive knowledge of complex source code, wireless communication devices, and massive 5G security standards. Therefore, in this paper, we propose a framework for the automatic verification of security vulnerabilities in the 5G control plane. This framework builds a 5G network using commercial Software Defined Radio (SDR) equipment and open-source software and implements a Man-in-the-Middle (MitM) attacker to deploy a control plane attack test bed. It also implements control plane message decoding and correction modules to execute message spoofing attacks and automatically classifies security vulnerabilities in 5G networks. In addition, a GUI-based web user interface is implemented so that users can create MitM attack scenarios and check the verification results themselves.
Quality Adaptation Scheme Based on Stability to Improve QoE of HTTP Adaptive Streaming in Wireless Networks
Minsu Kim, Heekwang Kim, Kwangsue Chung
http://doi.org/10.5626/JOK.2019.46.3.268
With the recent development of networks, the demand for video streaming has also been increasing, and more attention has been focused on HTTP adaptive streaming. HTTP adaptive streaming can guarantee QoE (Quality of Experience) because the client is provided with the options of selecting the quality adaptively according to the network state. However, in wireless networks, bandwidth is inaccurately measured due to high delay and packet loss. The existing quality adaptation schemes degrade the QoE because these schemes select quality using the measured bandwidth. In this paper, a quality adaptation scheme based on stability is proposed to improve QoE of HTTP adaptive streaming. The proposed scheme calculates the buffer underflow probability and the instability using the changes in the video quality and buffer and selects the quality according to the defined quality adaptation region. Experimental results established that the proposed scheme improves QoE as compared to the existing schemes by high average video quality and fewer quality changes.
RANSAC-based Time Synchronization over Wireless Networks
Junyoup Hwang, Daehyeon Wi, Jungjin Lee
http://doi.org/10.5626/JOK.2018.45.7.626
This paper describes a method to improve the quality of time synchronization for synchronous video streaming over a wireless network using a Simple Network Time Protocol (SNTP) with the RANdom SAmple Consensus (RANSAC) Algorithm. Time synchronization is mostly accomplished by using the NTP server. Speed and accuracy are important in synchronizing the video play module; however, NTP is limited because too much time is spent to operate the module. It also requires a complex structure and algorithms for customization. And SNTP, which is easy to implement, is also inappropriate for the wireless network because there is no filtering process for network failure. Our method refined those timestamps of SNTP using RANSAC, so that it achieves a stable synchronization, with 5 milliseconds of accuracy, which takes less than 5 seconds. This method enables high- quality time synchronization with a simple implementation for any kind of system, and will be useful for IoT devices.
Jitter-based Rate Control Scheme for Seamless HTTP Adaptive Streaming in Wireless Networks
Yunho Kim, Jiwoo Park, Kwangsue Chung
http://doi.org/10.5626/JOK.2017.44.6.628
HTTP adaptive streaming is a technique that improves the quality of experience by storing various quality videos on the server and requesting files of the appropriate quality based on network bandwidth. However, it is difficult to measure the actual bandwidth in wireless networks with frequent bandwidth changes and high loss rate. Frequent quality changes and playback interruptions due to bandwidth measurement errors degrade the quality of experience. We propose a technique to estimate the available bandwidth by measuring the jitter, which is the derivation of delay, on a packet basis and assigning a weight according to jitter. The proposed scheme reduces the number of quality changes and mitigates the buffer underflow by reflecting less bandwidth change when high jitter occurs due to rapid bandwidth change. The experimental results show that the proposed scheme improves the quality of experience by mitigating buffer underflow and reducing the number of quality changes in wireless networks.
Modified RTT Estimation Scheme for Improving Throughput of Delay-based TCP in Wireless Networks
Hyunsoo Kang, Jiwoo Park, Kwangsue Chung
In a wireless network, TCP causes the performance degradation because of mistaking packet loss, which is caused by characteristics of wireless link and throughput oscillation due to change of devices connected on a limited bandwidth. Delay based TCP is not affected by packet loss because it controls window size by using the RTT. Therefore, it can solve the problem of unnecessary degradation of the rate caused by misunderstanding reason of packet loss. In this paper, we propose an algorithm for improving the remaining problems by using delay based TCP. The proposed scheme can change throughput adaptively by adding the RTT, which rapidly reflects the network conditions to BaseRTT. It changes the weight of RTT and the increases and decreases window size based on the remaining amount of the buffer. The simulation indicated that proposed scheme can alleviate the throughput oscillation problem, as compared to the legacy TCP Vegas.
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