Browsing by Author "Quek, Tony Q. S."

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Effective Service Architecture and Antenna Allocation Mechanism for CoMP Transmissions in Ultra Dense Networks
(2019-09-01)
Tseng, Chun-Kai
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Wu, Sau-Hsuan
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Chao, Hsi-Lu
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Quek, Tony Q. S.
;
Gan, Chai-Hien
A practical and effective service deployment method is proposed for coordinated multi-point (CoMP) transmissions in ultra-dense networks (UDN). Despite the potential of UDN for throughput enhancement, the throughput of edge users is still considerably deteriorated by interferences from adjacent cells. Applying the CoMP transmissions among cells appears to be a feasible solution to resolve this issue. However, the nature of the almost randomly deployed locations of small cell base stations (BSs) and their limited numbers of antennas make it difficult to design an effective resource coordination mechanism for the CoMP services in UDN. Reconsidering this problem from an antenna allocation viewpoint, we present a simple yet effective approach to improve the cell-edge throughput under a centralized radio access network architecture. The first step is to partition the entire service area into multiple subareas, and the second step is to allocate the antenna degrees of freedom to each subarea. To improve the scalability of this service method, a two-tier service deployment method is further introduced based on the BS clustering and service area partitioning of the entire network. The simulation results show that the proposed service architecture can provide a significant improvement on the cell-edge throughput while still maintaining a good average throughput in the UDN.
GRAAD: Group Anonymous and Accountable D2D Communication in Mobile Networks
(2018-02-01)
Hsu, Ruei-Hau
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Lee, Jemin
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Quek, Tony Q. S.
;
Chen, Jyh-Cheng
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資訊工程學系
Device-to-device (D2D) communication is mainly launched by the transmission requirements between devices for specific applications such as proximity services in long-term evolution advanced networks, and each application will form a group of registered devices for the network-covered and network-absent D2D communications. During the applications of D2D communication, each device needs to identify the other devices of the same group in proximity by their group identity. This leads to the exposure of group information, by which the usage of applications can be analyzed by eavesdroppers. Hence, this paper introduces network-covered and network-absent authenticated key exchange protocols for D2D communications to guarantee accountable group anonymity, end-to-end security to network operators, as well as traceability and revocability for accounting and management requirements. We formally prove the security of those protocols, and also develop an analytic model to evaluate the quality of authentication protocols by authentication success rate in D2D communications. Besides, we implement the proposed protocols on android mobile devices to evaluate the computation costs of the protocols. We also evaluate the authentication success rate by the proposed analytic model and prove the correctness of the analytic model via simulation. Those evaluations show that the proposed protocols are feasible to the performance requirements of D2D communications.
Reconfigurable Security: Edge-Computing-Based Framework for IoT
(2018-09-01)
Hsu, Ruei-Hau
;
Lee, Jemin
;
Quek, Tony Q. S.
;
Chen, Jyh-Cheng
;
交大名義發表
In various scenarios, achieving security between IoT devices is challenging since the devices may have different dedicated communication standards and resource constraints as well as various applications. In this article, we first provide requirements and existing solutions for IoT security. We then introduce a new reconfigurable security framework based on edge computing, which utilizes a near-user edge device, that is, a security agent, to support security functions as IoT resources for the security requirements of all protocol layers including multiple applications on an IoT device. This framework is designed to overcome the challenges including high computation costs, low flexibility in key management, and low compatibility in deploying new security algorithms in IoT, especially when adopting advanced cryptographic primitives. We also provide the design principles of the reconfigurable security framework, the exemplary security protocols for anonymous authentication and secure data access control, and the performance analysis in terms of feasibility and usability. The reconfigurable security framework paves a new way to strengthen IoT security by edge computing.