Secure MISO Cognitive-Based Mobile Edge Computing With Wireless Power Transfer

Abstract

The finite battery capacity, limited spectrum resource and the transmission security are three challenges in designing mobile edge computing (MEC) systems. In this paper, a framework for wireless powered secure multiple-input single-output (MISO) cognitive-based MEC-enabled networks is proposed, which integrates several technologies: physical-layer security, cooperative relaying, cognitive radio (CR), wireless power transfer (WPT) and MEC. Two optimization problems are formulated to maximize the number of computation bits (NCB) of the mobile device (MD) and minimize the total transmission power (TTP) of the primary transmitter (PT) and the SBS, respectively. The formulated problems are non-convex and hard to solve. Two two-phase methods with block coordinate decent (BCD) and Lagrangian dual decomposition methods are proposed to jointly design the beamforming vector of the PT, beamforming matrix of the secondary base station (SBS), the central processing unit (CPU) frequency, the transmit power, the number of the offloaded bits and the offloading time of the MD. Simulation results are presented to show the effectiveness of the proposed methods. INDEX TERMS Mobile edge computing, cognitive radio, physical-layer security, wireless power transfer, MISO.

Robust Secure Wireless Powered MISO Cognitive Mobile Edge Computing

“…Obviously, WPT, CR and MEC can be combined to construct a WPT-CR based MEC system, which can simultaneously alleviate the energy and the spectrum limitations of the MEC. A WPT-CR based MEC system was studied in [12], [13], [16]. In [13], the MD sensed the status of the primary transmitter (PT) and adjusted its parameters based on the sensing results to access the spectrum for WPT and task offloading.…”

“…The MD first harvested energy from the PT's transmission, then, it cooperatively relayed the PT's residual data in exchange for the spectrum access opportunity for WPT and task offloading. The WPT-CR based MEC framework in [12] was extended to a multi-antenna scenario in [16], in which the PT and the secondary base station (SBS) were equipped with multiple antennas. Moreover, the physical layer security of the PT's transmission was taken into consideration.…”

“…• We propose a robust secure wireless powered MISO cognitive MEC system, which consists of a multi-antenna PT, a multi-antenna SBS, a single-antenna primary receiver (PR) and a single-antenna MD. Different from [16], we consider underlay scheme, i.e., the SBS and the MD simultaneously transmit with the PT over the same spectrum. The transmission security and the interference temperature of the PT and PR, and the calculation deadline of the MD are considered.…”

“…Having obtained f * , p * u , we solve the dual problem (16) to calculate the minimum amount of the energy that the MD needed. We adopt subgradient based method is to obtain the optimal λ opt for problem (16). One subgradient for problem (16) is given as…”

Developmental Proposal of a Generic Architecture for Cognitive Internet of Things

“…The cognitive network and the cognitive computing can be incorporated to the IoT, which can form Cognitive Internet of Things (CIoT) [21,22,23,24,25,26]. By merging the edge computing vision [27,28] as well as cognitive services which is based on artificial intelligence, a new idea named edge cognitive computing [29] came into existence. This is expected to provide cognitive computing in the network at the edge [30].…”