Twelve Scientific Challenges for 6G: Rethinking the Foundations of Communications Theory

Chafii, Marwa; Bariah, Lina; Muhaidat, Sami; Debbah, Mérouane

doi:10.1109/comst.2023.3243918

Cited by 98 publications

(41 citation statements)

References 143 publications

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“…Then, since is not a leaf, ∃ ∈ L | ∈ . Thus, from the shortest path routing assumption, it follows that 2)) but with a lower cost than D * (see (1)). Consequently D * cannot be an optimal solution for .…”

Section: A Mathematical Modelmentioning

confidence: 99%

“…In addition, Registration messages have also a payload, consisting of monitoring data. Since we target UDP as transport protocol for its lightweight, connectionless operation, we recommend the usage of (compressed) JSON to encode these data and fit them into a single message 1 . We can also consider a variant of this approach, in which also Response messages may optionally carry a payload containing updated monitoring data from responder and forwarders.…”

Section: B the Peer Selection Algorithmsmentioning

confidence: 99%

“…The development of the 6G systems requires facing significant technological challenges in different directions [1]. For example, wireless link throughput needs to be scaled up to realize breakthrough applications such as holographic communication based on interactions with so-called digital twins [2].…”

Section: Introductionmentioning

confidence: 99%

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Gossip-Based Monitoring Protocol for 6G Networks

Femminella

Reali

2023

IEEE Trans. Netw. Serv. Manage.

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The service function (SF) area has gained increasing attention in the last years due its ability to combine the advantages of cloud computing with network softwarization. By decoupling SFs from the physical equipment where they are executed, it is possible to make network services scalable and flexible. These advantages become even more evident in the forthcoming 6G networks, where the overall environment is expected to become more dynamic and cloud-based, with SFs deployed as cloud-native functions. However, in order to efficiently manage and compose services using these SFs, it is necessary to monitor the available resources of the nodes where they can be deployed, in addition to exchange information relevant to the operational status of active SFs. To this aim, we propose a lightweight monitoring architecture by using agents in charge of monitoring the status of SFs running in co-located clusters. These monitoring agents exchange their information by means of a gossip protocol, which allows increasing the reliability of the process. In this way, it is possible to keep service decisions as local as possible, limiting the interactions with centralized decision and orchestration platforms, and thus increasing network scalability and responsiveness. Performance evaluation shows the effectiveness of the proposed solution, and demonstrates that the network overhead of the distributed monitoring process is definitely affordable.

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Section: A Mathematical Modelmentioning

confidence: 99%

Section: B the Peer Selection Algorithmsmentioning

confidence: 99%

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Gossip-Based Monitoring Protocol for 6G Networks

Femminella

Reali

2023

IEEE Trans. Netw. Serv. Manage.

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“…In the past ten years, owing to the contributions from both academia and industry, massive multiple-input multipleoutput (MIMO) technique has been well developed and greatly improved the performance of 5G cellular networks [1]. In the future 5G-Advanced and 6G cellular networks, new applications are rapidly emerging, which require much higher data rate, lower latency, and higher reliability [2].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic-Compliant Channel Modeling and Performance Evaluation for Holographic MIMO

Wang¹,

Wang²,

Zhong³

et al. 2023

Preprint

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Recently, the concept of holographic multiple-input multiple-output (MIMO) is emerging as one of the promising technologies beyond massive MIMO. Many challenges need to be addressed to bring this novel idea into practice, including electromagnetic (EM)-compliant channel modeling and accurate performance evaluation. In this paper, an EM-compliant channel model is proposed for the holographic MIMO systems, which is able to model both the characteristics of the propagation channel and the non-ideal factors caused by mutual coupling at the transceivers, including the antenna pattern distortion and the decrease of antenna efficiency. Based on the proposed channel model, a more realistic performance evaluation is conducted to show the performance of the holographic MIMO system in both the single-user and the multi-user scenarios. Key challenges and future research directions are further provided based on the theoretical analyses and numerical results.

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“…In this sense, the context of the transmitted information is used by the receiver on its data stream to infer the most possible message according to its knowledge of possible source messages. Thus, semantic communications can increase reliability, since an error in the bit level does not necessarily imply an error in the semantic level [5].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Semantic-Shannon Communications

Evgenidis¹,

Mitsiou²,

Tegos³

et al. 2023

Preprint

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<p>Recently, semantic communications have been considered as a promising beyond-Shannon paradigm to reduce network traffic and increase reliability, thus making wireless networks more energy efficient, robust, and sustainable. However, the performance is limited by the efficiency of the semantic transceivers, i.e., the achievable “similarity” between the transmitted and the received signal. If a strict similarity requirement holds, semantic transmission may not be applicable, thus Shannon communication is mandatory. In this paper, for the first time in the literature, we propose a multi-carrier Hybrid Semantic-Shannon communication system, where without loss of generality, the case of text transmission is investigated. To this end, a joint semantic-Shannon transmission selection and power allocation optimization problem is formulated, aiming to minimize the transmission delay, while it guarantees a strict similarity threshold. Despite its non-convexity, by utilizing alternating optimization the problem is separated into a convex and a mixed linear integer programming one, both of which can be optimally solved. Moreover, to improve the performance of the proposed hybrid scheme, a novel association of text sentences to subcarriers is proposed based on the sentence’s data size and subcarriers’ channel gains. We show that the proposed association is optimal in terms of transmission time delay. Numerical results and simulations verify the effectiveness of the proposed hybrid semantic-Shannon communication method and the derived sentence-to-subcarrier association, and provide useful insights on the designing parameters of such systems. </p>

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Twelve Scientific Challenges for 6G: Rethinking the Foundations of Communications Theory

Cited by 98 publications

References 143 publications

Gossip-Based Monitoring Protocol for 6G Networks

Gossip-Based Monitoring Protocol for 6G Networks

Electromagnetic-Compliant Channel Modeling and Performance Evaluation for Holographic MIMO

Hybrid Semantic-Shannon Communications

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