In this paper, we aim to study a 𝒍-user quantum multiple access wiretap channel with an arbitrary number of wiretappers under one-shot setting. In this regard, we first introduce the general quantum multiple access wiretap channel and the simplified proposed channel. Then, we calculate an achievable secrecy rate region for the main channel with two users. The encoding process uses the superposition and wiretap coding techniques, and the decoding technique is based on the simultaneous decoder. Also, Convex splitting is used to satisfy security requirements. At last, we extend the results to the l-user case.

In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with one obtained by Hou-Koetter-Kramer, for the channel with relay-source feedback.

In this paper, we want to investigate classical-quantum multiple access wiretap channels (CQ-MA-WTC) under one-shot setting. In this regard, we analyze the CQ-MA-WTC using a simultaneous position-based decoder for reliable decoding and using a newly introduced technique to decode securely. Also, for the sake of comparison, we analyze the CQ-MA-WTC using Sen’s one-shot joint typicality lemma for reliable decoding. The simultaneous position-based decoder tends to a multiple hypothesis testing problem. Also, using convex splitting to analyze the privacy criteria in a simultaneous scenario becomesproblematic. To overcome both problems, we first introduce a new channel that can be considered as a dual to the CQ-MA-WTC. This channel is called a point-to-point quantum wiretap channel with multiple messages (PP-QWTC). In the following, as a strategy to solve the problem, we also investigate and analyze quantum broadcast channels (QBC) in the one-shot regime.

In this paper, we want to derive achievable secrecy rate regions for quantum interference channels with classical inputs under a one-shot setting. The main idea to this end is to use the combination of superposition and rate splitting for the encoding scheme and construct a decoding scheme based on simultaneous decoding.

In recent years, we are constantly facing the increase of Internet of Things devices in the fields of health, agriculture, industry and other applications. The using of these networks will increase by improving the quality of service. Usually, data are generated heterogeneously by IoT’s sensors at different times with   different sizes and priorities, and none of previous works in this field do not consider all these modes together; on the other hand, these studies either have worked on the queue model and priority package selection, or on the channel access methods and its prioritization. Therefore, in our proposed model in this paper, with the aim of improving quality of service, thight scheduling of delay-sensitive packets, and also avoiding starvation for lower priority packets, we consider an architecture including two levels of prioritization. In the first level, the packet is selected for sending based on a type of dynamic prioritization and relative to its delay deadline field. Since in this paper the application of Internet of Things in health care is considered, the sensors generate data both of modes, periodically (fixed) and on demand (critical), and therefore, two queue models D /G/1 and M/G/1 are used. In addition, the second level includes channel prioritization. At this level, by using a control channel and setting the waiting time of the sending node for listening to the channel, we have sending the packet through the control channel. Furthermore, a consolidated channel hopping model has been used for nodes to use the available bandwidth. Also, a buffer to keep the information of the last connection of the node helps to send and receive faster with less number of switching. After simulating and comparing this model with the 802.11 standard and similar media access protocols, significant improvements in increasing the packet delivery rate, operational throughput, and also reducing the end-to-end delay are showed.