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3rd IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2023

作者： Sarkar, Subhojit Dutta, Rathindra Nath Ghosh, Sasthi C. Indian Statistical Institute Advanced Computing and Microelectronics Unit Kolkata India

ISBN: (纸本)9798350333732

Unmanned Aerial Vehicles (UAVs) are a potential platform for deploying millimeter wave (mmWave) base stations. Their high spatial flexibility makes them an attractive choice for the deployment in disaster management scenarios, and for offloading in crowded areas. Apart from the stringent propagation requirements of mmWaves, one challenge that has to be addressed is the limited power onboard a UAV, which is used to hover and move the device, and of course, to transmit data. In this paper, we deal with the deployment of UAVs with an aim to minimising their displacement in subsequent time. We take into consideration user mobility, and propose LazyUAV, a Set-Cover based geometric approach to minimise UAV displacement, while maintaining maximal coverage. Via extensive simulations, we demonstrate the effectiveness of our approach. © 2023 IEEE.

关键词： Millimeter waves

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Uniform k-Circle Formation by Fat Robots 25th

Uniform k-Circle Formation by Fat Robots

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25th International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2023

作者： Das, Bibhuti Mukhopadhyaya, Krishnendu Advanced Computing and Microelectronics Unit Indian Statistical Institute Kolkata India

ISBN: (纸本)9783031442735

In this paper, we study the uniform k-circle formation by a swarm of mobile robots with dimensional extent. For some k> 0, the k-circle formation problem asks the robots to form disjoint circles. Each circle must be centered at one of the pre-fixed points given in the plane. Each circle should contain exactly k distinct robot positions. The k-circle formation problem has already been studied for punctiform robots in the plane. In this paper, the robots are represented by transparent unit disks in the plane. They are autonomous, anonymous, homogeneous, and silent. The robots are oblivious and execute Look-Compute-Move (LCM) cycle under a fair asynchronous scheduler. The direction and orientation of one of the axes are agreed upon by the robots. In this setting, we have characterized all the initial configurations and values of k for which the uniform k-circle formation problem is deterministically unsolvable. For the remaining configurations and values of k, a deterministic distributed algorithm has been proposed that solves the uniform k-circle formation problem within finite time. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Distributed computer systems

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Obstacle Aware Link Selection for Stable Multicast D2D Communications 3rd

Obstacle Aware Link Selection for Stable Multicast D2D Comm...

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3rd International Conference on Computer and Communication Engineering, CCCE 2023

作者： Dutta, Rathindra Nath Ghosh, Sasthi C. Advanced Computing and Microelectronics Unit Indian Statistical Institute Kolkata India

ISBN: (纸本)9783031352980

The rapid growth of multimedia applications requiring high bandwidth has paved the way for millimeter-wave (mmWave) device-to-device (D2D) communications. In many modern applications, such as video streaming, same data packets need to be delivered to a group of users. Multicasting these packets has a clear advantage over repeated unicast. Establishing a stable multicast route for mmWave D2D communications is a challenging task as presence of obstacles can easily break a link. In this work we devise a mechanism for constructing a stable route for D2D multicast communications in presence of static as well as dynamic obstacles. This requires some knowledge about the blockage probabilities due to the obstacles. We then present a way of learning these blockage probabilities using the Dempster-Shafer evidential theory framework. We show the effectiveness of our proposed scheme over an existing approach through extensive simulations. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Multicasting

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Joint Base Station and Reflector Placement in an urban mmWave Network 3

Joint Base Station and Reflector Placement in an urban mmWav...

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3rd IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2023

作者： Dutta, Rathindra Nath Sarkar, Subhojit Ghosh, Sasthi C. Indian Statistical Institute Advanced Computing and Microelectronics Unit Kolkata India

ISBN: (纸本)9798350333732

Millimeter-wave (mmWave) technology is expected to be the backbone of future communication networks. However, for all its benefits, mmWave communication comes with its fair share of challenges. In this context, the obstacle free strict line-of-sight (LOS) requirement is one of the primary hurdles that has to be crossed. One way to deal with this problem is to densely deploy small range base stations, called gNBs, to overcome outage due to obstacles. Reflectors have been proposed to augment the transmission environment, and reflect mmWaves bypassing the obstacles. Evidently, they can be used to increase the coverage area that do not have LOS with the available gNBs. We argue that considering the placement of gNBs and reflectors independently may lead to suboptimal solution. In this paper, we consider an urban deployment scenario, and attempt to maximally cover it by jointly placing the gNBs and reflectors. Given the hardness of the joint problem, we first develop a set cover based greedy solution and also provide a linear programming (LP) relaxation based solution. With extensive simulations, we show that with fixed number of available gNBs and reflectors to be placed, both our joint placement solutions can achieve a larger coverage compared to an existing approach. © 2023 IEEE.

关键词： Base stations

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Improved Lower Bound for L(1, 2)-Edge-Labeling of Infinite 8-Regular Grid 9th

Improved Lower Bound for L(1, 2)-Edge-Labeling of Infinite ...

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The 9th International Conference on Mathematics and computing (ICMC 2023)

作者： Koley, Subhasis Ghosh, Sasthi C. Advanced Computing and Microelectronics unit Indian Statistical Institute 203 B. T. Road Kolkata700108 India

ISBN: (纸本)9789819930791

Let us take two given integers h and k where h, k≥ 0 and a graph G= (V(G), E(G) ). An L(h, k)-edge-labeling for G is defined as a function f′: E(G) → { 0, 1, ⋯, n} such that ∀ e1, e2∈ E(G), | f′(e1) - f′(e2) | ≥ h when d′(e1, e2) = 1 and | f′(e1) - f′(e2) | ≥ k when d′(e1, e2) = 2 where d′(e1, e2) denotes the distance between e1 and e2 in G. If there is no other way to connect e1 and e2 with less than k′- 1 number of edges in G, then d′(e1, e2) = k′. The objective is to find the span which is the least value of n obtained over all such L(h, k)-edge-labeling for G, and it is denoted as λh,k′(G). Motivated from the channel assignment problem in wireless network, L(h, k)-edge-labeling has been studied for various infinite regular grid graphs. For infinite 8-regular grid T8, it is known in the existing literature that 25≤λ1,2′(T8)≤28. But the lower and upper bounds obtained there are not identical. Here, we improve the lower bound and prove that λ1,2′(T8)≥28 and eventually it is proved that λ1,2′(T8)=28. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2023.

关键词： Combinatorial optimization

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Mobility Aware Path Selection for Millimeterwave 5G Networks in the Presence of Obstacles 3rd

Mobility Aware Path Selection for Millimeterwave 5G Network...

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3rd International Conference on Computer and Communication Engineering, CCCE 2023

作者： Sarkar, Subhojit Ghosh, Sasthi C. Advanced Computing and Microelectronics Unit Indian Statistical Institute 203 B. T. Road Kolkata700108 India

ISBN: (纸本)9783031352980

An often overlooked metric in millimeterwave communication is the so-called stability of assigned links. Links can fail due to obstacles (both static and dynamic), and user mobility. Handling static obstacles is easy;the challenge comes in tracking dynamic obstacles which may impede transmission in the near future. Most works in literature track dynamic obstacles by using additionally deployed hardware like radars and cameras, which add to deployment cost. Our approach requires no such additional hardware. We handle multiple static obstacles, and a single dynamic obstacle, to allocate stable transmission paths which are unlikely to break in the near future. We then adopt a holistic approach to the problem of transmission path allocation, by assigning paths that are estimated to be active for the longest possible time, albeit at the cost of some individual throughput. In other words, we do not always select the best link based on instantaneous system parameters;rather, we can counter-intuitively choose slower, but more stable links. To achieve this, we consider user mobility, and obstacles which may cause links to fail prematurely. We demonstrate the accuracy with which dynamic obstacle trajectories can be captured by our proposed approach. By further simulation studies, we show that our approach leads to the assignment of more stable links as compared to the traditional received signal strength based greedy approach. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： 5G mobile communication systems

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A Geometry-Based Strategic Placement of RISs in Millimeter Wave Device to Device Communication 3rd

A Geometry-Based Strategic Placement of RISs in Millimeter...

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3rd International Conference on Computer and Communication Engineering, CCCE 2023

作者： Sau, Lakshmikanta Ghosh, Sasthi C. Advanced Computing and Microelectronics Unit Indian Statistical Institute 203 B. T. Road Kolkata700108 India

ISBN: (纸本)9783031352980

Recently, reconfigurable intelligent surfaces (RISs) have been introduced in millimeter wave (mmWave) device to device (D2D) communication scenarios to provide seamless connection and high data rate to a pair of proximity users. However, such high data rate can be achieved, only if the concerned device pair resides in close proximity and a direct line of sight (LoS) link exists between them. The proximity and the LoS link is necessary because of the high propagation and penetration losses of the mmWaves. The direct LoS link between a pair of devices may be blocked easily by static obstacles like buildings and trees. If there is no such direct LoS link between a pair of devices, we can use RIS to form an indirect LoS link between them. However, in that case, proper placement of RISs is necessary to provide such indirect LoS link. In this work, we develop a RIS placement strategy to serve those device pairs who do not have any direct LoS links. In order to provide an indirect LoS link for a requesting device pair, we first use some basic ideas from computational geometry to find out the candidate zones for placing RISs. Next we find the candidate zones for all such requesting device pairs considering the fact that two or more candidate zones may overlap and create a new candidate zone. We construct a graph where each candidate zone represents a vertex and there exist an edge between two overlapping candidate zones. We convert the RIS placement problem to a clique partitioning problem of the graph and use a greedy algorithm to get a near optimal solution. From simulation results, we can see that the strategically placed RISs give better performance in comparison to an existing deployment strategy, which places RISs only on the walls of the building. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Millimeter waves

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Double reflections Assisted RIS Deployment and Energy-efficient Group Selection in mmWaves D2D Communication

arXiv

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arXiv 2025年

作者： Sau, Lakshmikanta Ghosh, Sasthi C. The Advanced Computing & Microelectronics Unit Indian Statistical Institute Kolkata700108 India

Reconfigurable intelligent surfaces (RISs) offer a viable way to improve the performance of the multi-hop device-to-device (D2D) communication. However, due to the substantial propagation and penetration losses of the millimeter waves (mmWaves), a direct line of sight (LoS) link and close proximity of a device pair are required for a high data rate. Static obstacles like trees and buildings can easily impede the direct LoS connectivity between a device pair. Hence, RIS placement plays a crucial role in establishing an indirect LoS link between them. Therefore, in this work, we propose a set cover-based RIS deployment strategy for both single and double RIS-assisted D2D communication. In particular, we have demonstrated that permitting reflections via two consecutive RISs can greatly lower the RIS density in the environment, preventing resource waste and enabling the service of more obstructed device pairs. After the RIS deployment, for information transfer, we also propose an energy-efficient group selection criteria. Moreover, we prove that sometimes double reflections are more beneficial than single reflection, which is counter-intuitive. Numerical results show that our approach outperforms a random and a recent deployment strategy. © 2025, CC BY-NC-SA.

关键词： Clutter (information theory)

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Energy-efficient UAV movement and user-UAV association in multi-UAV networks

arXiv

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arXiv 2025年

作者： Ghosh, Subhadip Mukherjee, Priyadarshi Ghosh, Sasthi C. Advanced Computing and Microelectronics Unit Indian Statistical Institute Kolkata700108 India

These days, unmanned aerial vehicle (UAV)-based millimeter wave (mmWave) communication systems have drawn a lot of attention due to the increasing demand for faster data rates. Given the susceptibility of mmWave signals to obstacles and high propagation loss of mmWaves, ensuring line-of-sight (LoS) connectivity is critical for maintaining robust and efficient communication. Furthermore, UAVs have limited power resource and limited capacity in terms of number of users it can serve. Most significantly different users have different delay requirements and they keep moving while interacting with the UAVs. In this paper, first, we have provided an efficient solution for the optimal movement of the UAVs, by taking into account the energy efficiency of the UAVs as well as the mobility and delay priority of the users. Next, we have proposed a greedy solution for the optimal user-UAV assignment. After that, the numerical results show how well the suggested solution performs in comparison to the current benchmarks in terms of delay suffered by the users, number of unserved users, and energy efficiency of the UAVs. © 2025, CC BY-NC-SA.

关键词： Unmanned aerial vehicles (UAV)

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Fault Secured JPEG-Codec Hardware Accelerator with Piracy Detective Control using Secure Fingerprint Template 36

Fault Secured JPEG-Codec Hardware Accelerator with Piracy De...

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36th IEEE International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology Systems, DFT 2023

作者： Chaurasia, Rahul Reddy Asireddy, Abhinav Sengupta, Anirban Indian Institute of Technology Computer Science and Engineering Indore India Indian Institute of Technology Department of Computer Science and Engineering Indore India Indian Statistical Institute Advanced Computing and Microelectronics Unit Kolkata India

ISBN: (纸本)9798350315004

This paper presents a novel methodology to design fault secured JPEG-compression-decompression (codec) hardware accelerator with piracy detective control using secure fingerprint template of intellectual property (IP) vendor. In the proposed approach, firstly, the fault secured schedule for JPEG-codec design is generated from its behavioral description. Subsequently, in order to enable detective control against piracy, secure digital template corresponding to fingerprint biometric of IP vendor is generated and implanted into the design. In order to do so, firstly, fingerprint features are transformed based on IP vendor specified key-set. Subsequently, the generated secure fingerprint template in the form of encoded hardware security constraints is implanted into the design during behavioral/ high-level synthesis phase of integrated circuit (IC) design. The implanted hardware security constraints thereby ensure the seamless detection and isolation of fake/pirated design versions during piracy detection process, before their conjunction into system on chip (SoC) of electronic systems. The proposed approach achieves the following: i) fault secured hardware accelerator for JPEG-codec with integrated piracy detective control at negligible design cost overhead ii) higher resiliency against tampering attack and iii) lower probability of coincidence (indicating definitive proof of ownership for genuine IP vendor). © 2023 IEEE.

关键词： Fault detection

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