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The energy and time efficiency of wireless sensor networks (WSNs) is frequently affected by the low reliability of their links. To mitigate the outage probability, cooperation topologies are used. However, these topologies have particular challenges since the relay consumes energy in assisting a foreign communication, and the successful transmissio...
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Context 1
... υ S 1 , υ S 2 and υ e denote the number of packets destined to S 1 in B SR , the number of packets destined to S 2 in B SR , and the number of packets in the buffer B SR destined to the receiver with the link unavailable, respectively. For example, in a time slot, if S 1 R is available, S 2 R is unavailable, and Q TR = 5 being three packets destined for S 1 and two destined for S 2 , then υ S 1 = 3, υ S 2 = 2, and υ e = 2. Figure 6 shows the strategy and method used to model all the possibilities in this scenario. Based on BSI/CSI, the relay sends a reference signal to the transmitters and three possibilities can happen: • As in Scenario 2, if both links are not available, the new packets from nodes S 1 and S 2 are lost. ...
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Citations
... To achieve reliable communication and reduce delay, the authors in [21] proposed a delay-sensitive buffer-aided relay selection based on channel-based greedy scheduling in vehicular networks. Because of the low implementation complexity of buffer-aided relay selection, the authors in [22] use buffer-aided relay selection to improve the reliability of bidirectional wireless sensor network communications. These buffer-aided relay selection schemes described above are all based on MP. ...
This paper investigates the problem of buffer-aided relay selection to achieve reliable and secure communications in a two-hop amplify-and-forward (AF) network with an eavesdropper. Due to the fading of wireless signals and the broadcast nature of wireless channels, transmitted signals over the network may be undecodable at the receiver end or have been eavesdropped by eavesdroppers. Most available buffer-aided relay selection schemes consider either reliability or security issues in wireless communications; rarely is work conducted on both reliability and security issues. This paper proposes a buffer-aided relay selection scheme based on deep Q-learning (DQL) that considers both reliability and security. By conducting Monte Carlo simulations, we then verify the reliability and security performances of the proposed scheme in terms of the connection outage probability (COP) and secrecy outage probability (SOP), respectively. The simulation results show that two-hop wireless relay network can achieve reliable and secure communications by using our proposed scheme. We also performed comparison experiments between our proposed scheme and two benchmark schemes. The comparison results indicate that our proposed scheme outperforms the max-ratio scheme in terms of the SOP.
... How to ensure people's growing demand for communication traffic and rationally solve the problem of spectrum resource shortage are the main issues that people need to deal with in today's society. Fortunately, the arrival of relay communication technology and device to device (D2D) communication technology has brought solutions to the above problems [7,8]. ...
... ,min , , q q k q max P P P (8) ,min , ,max n n k n P P P (9) ,min q P and ,max q P , respectively, represent the minimum transmission power and maximum transmission power allowed by the RUE of the relay communication user equipment; ...
The sudden explosive growth of data in intelligent devices and existing communication networks has brought great challenges to existing communication networks. On the one hand, D2D (device to device) technology greatly improves the utilization of spectrum resources; on the other hand, it improves the communication quality of users. It has become an important part of the future communication network. Aiming at the problem that the existing D2D communication network system has complex user interference, and the communication quality of cellular users is difficult to guarantee, a D2D communication network interference coordination scheme based on improved Stackelberg is proposed. Using resource allocation and power control to solve the interference coordination problem, this paper proposes an improved Stackelberg model based on DQN (deep Q network), establishes the master–slave game between cellular users and multiplexing resource users (D2D users; relay communication users), optimizes the cost parameters in the Stackelberg mode and improves the transmission power and resource allocation scheme of multiplexing resource users. The simulation results show that compared with similar algorithms, the algorithm proposed in this paper has the best performance in guaranteeing the QoS of cellular users in the system and has good interference management capability for D2D communication networks.
