Efficient resource allocation for device to-device
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This document summarizes a study on efficient resource allocation for device-to-device (D2D) communication underlying an LTE network. It describes the network model including Evolved Packet Core components. It also outlines the radio resource and access technologies used in LTE such as OFDMA. The document defines the problem of intelligently selecting shared radio blocks to improve network throughput. It presents the simulation methodology used to evaluate random and heuristic D2D resource assignment algorithms. The results demonstrate that a greedy heuristic algorithm improves network performance in terms of total throughput without harming the primary network.
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Handover could be horizontal or vertical and per user requirement. MIH (media independent handover) though provide vertical handover but on other hand 802.11had provided us fast and secure connection oriented handover from one access point to another with in same mobility domain.
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A bipartite graph based proportional fair scheduling strategy to improve thr...
The fifth-generation wireless communication is expected to provide a huge amount of capacity to cater to the need of an increasing number of mobile consumers, which can be satisfied by device-to-device (D2D) communication. Reusing the cellular user’s resources in an efficient manner helps to increase the spectrum efficiency of the network but it leads to severe interference. The important point in reusing cellular user resources is that D2D communication should not affect the cellular user’s efficiency. After achieving this requirement, the focus is now turned toward the allocation of resources to D2D communication. This resource allocation strategy is to be designed in such a way that it will not affect communication among the cellular user (CU). This scheme improves various performance objectives. This paper aims at designing a proportional fair resource allocation algorithm based on the bipartite graph which maintains the quality of service (QoS) of CUs while providing D2D communication. This algorithm can be merged with any other scheme of resource allocation for improving QoS and adopting changing channels. In this scheme, a D2D pair can be allocated with one or more than one resource blocks. The MATLAB simulations analyze the performance of the proposed scheme.
LTE.ppt
LTE is a cellular technology standard that improves on 3G networks with higher data rates, lower latency, and improved spectral efficiency. It uses OFDMA in the downlink and SC-FDMA in the uplink. The LTE architecture features enhanced Node Bs (eNBs) that connect directly to the core network through an S1 interface without intermediary nodes. Key network entities include the Mobility Management Entity (MME) for signaling and mobility, Home Subscriber Server (HSS) for user data, and gateways that interface with packet data networks. LTE aims to provide low latency communication with short setup times through an optimized frame structure.
optical space division multiplexing
Optical space division multiplexing uses multiple cores or modes in optical fibers to increase transmission capacity. A history of the technology was provided, noting the progression from single mode fibers to coherent detection and polarization multiplexing. Limits with single mode fibers were discussed, along with ways that multi-core and multi-mode fibers can overcome capacity constraints through spatial multiplexing across fiber cores and modes. Recent demonstrations showed record capacities of 57.6 Tb/s over multi-mode fiber and 24 Tb/s over hollow-core fiber. Integration challenges with spatial division multiplexing were also outlined.
Design of time division multiplexing/wavelength division multiplexing passiv...
This paper presents the design of time division multiplexing-wavelength division multiplexing-passive optical network (TDM-WDM PON). In this design, the current TDM PON is incorporated with the proposed WDM-PON in order to design a high-capacity network with lower loss requirements. The design has been simulated using OptiSystem software. The upstream wavelength for WDM is between 1,530.334 to 1,542.142 nm while for TDM is 1,310 nm. The downstream wavelength for WDM is from 1,569.865 to 1,581.973 nm, while for TDM is 1,490 nm. Based on the result, it is found that the proposed network is capable to support up to 64 customers with a bit rate of 2.5 Gbps.
Modelling and QoS-Achieving Solution in full-duplex Cellular Systems
The global bandwidth scarcity and the ever-growing demand for fast wireless services have motivated the quest for new techniques that enhance the spectral efficiency (SE) of wireless systems. Most conventional SE increasing methods (e.g., adaptive modulation and coding) have already been exhausted. Single-channel full-duplex (SCFD) communication is a new attractive approach in which each node may simultaneously receive and transmit over the same frequency channel, and thus, it has the potential to double the current SE figures. In this paper, we derive a model for the signal-to-interference-plus-noise ratio (SINR) in a SCFD-based cellular system with imperfect self-interference cancellation. Furthermore, given a set of uplink and downlink quality of service requirements, we answer the following two fundamental questions. First, is this set achievable in the SCFD-based cellular system? Second, if the given set is achievable, what is the optimal achieving policy? To that end, we provide a unified model for the SCFD-based cellular system, and give insights in the matrix of interference channel gains. Simulation results suggest that depending on the locations of the users, a combination of full-duplex and half-duplex modes over the whole network is more favourable policy
DEVICE-TO-DEVICE (D2D) COMMUNICATION UNDER LTE-ADVANCED NETWORKS
Device-to-Device (D2D) communication is a new technology that offer many advantages for the LTEadvanced
network such us wireless peer-to-peer services and higher spectral efficiency. It is also
considered as one of promising techniques for the 5G wireless communications system and used in so
many different fields such as network traffic offloading, public safety, social services and applications such
as gaming and military applications . The goal of this paper is to present advances on the current 3GPP
LTE-advanced system related to Device-to-Device (D2D). In this paper, we provide an overview of the
D2D types based on the communication spectrum of D2D transmission, namely Inband D2D
communication and Outband D2D communication. Then we present the advantages and disadvantages of
each D2D mode. Moreover, architecture and protocol enhancements for D2D communications under
LTE-A network are described.
Markovian Queueing Model for Throughput Maximization in D2D-Enabled Cellular ...
Device-to-Device (D2D) communication has been considered a key enabling technol- ogy that can facilitate spectrum sharing in 4G and 5G cellular networks. In order to meet the high data rate demands of these new generation cellular networks, this paper considers the optimization of available spectrum resource through dynamic spectrum access. The utilization of continuous-time Markov chain (CTMC) model for efficient spectrum access in D2D-enabled cellular networks is investigated for the purpose of determining the impact of this model on the capacity improvement of cellular networks. The paper considers the use of CTMC model with both queueing and non-queueing cases called 13-Q CTMC and 6-NQ CTMC respectively with the aim of improving the overall capacity of the cellular network under a fairness constraint among all users. The proposed strategy consequently ensures that spectrum access for cellular and D2D users is optimally coordinated by designing optimal spectrum access probabilities. Numerical simulations are performed to observe the impact of the proposed Markovian queueing model on spectrum access and consequently on the capacity of D2D-enabled cellular networks. Results showed that the proposed 13-Q CTMC provide a more spectrumefficient sharing scheme, thereby enabling better network performances and larger capabilities to accommodate more users.
Lte training an introduction-to-lte-basics
The document provides an overview of LTE (Long Term Evolution) technology. It discusses that LTE was standardized by 3GPP in 2008 to improve the performance and efficiency of wireless networks. Key aspects of LTE include the use of OFDMA for downlink and SC-FDMA for uplink, support for flexible bandwidths, and an evolved packet core network architecture. LTE aims to provide higher speeds, lower latency, and more efficient use of spectrum compared to previous 3G technologies.
1 s2.0-s1389128620312354-main
This document discusses resource allocation for dense millimeter wave (mmWave) cellular networks assisted by device-to-device (D2D) communication. It formulates the problem into two sub-problems: 1) joint access and backhaul resource allocation and 2) joint D2D access and forwarding link resource allocation. It proposes using game theory to model the sub-problems as non-cooperative games and develops centralized and decentralized algorithms to obtain resource allocation solutions. Simulation results show the algorithms can effectively mitigate the impact of blockages on network performance.
Performance evaluation of VLC system using new modulation approach
This document evaluates the performance of a new modulation scheme called catenated-OFDM for visible light communications (VLC) systems. Catenated-OFDM involves transmitting multiple OFDM signals simultaneously over different optical bands. The proposed system is simulated using Optisys software. Results show the system can achieve transmission distances of up to 12 meters for 2 dBm input power with 3 optical bands and a data rate of 10 Gbps. Higher data rates, up to 15 Gbps, are also possible. Increasing the number of optical bands or decreasing the data rate improves the receiver sensitivity. The catenated-OFDM approach shows potential for high-speed optical wireless communications.
The Coexistence of Device -to- Device (D2D) Communication under Heterogeneous...
This document discusses device-to-device (D2D) communication in heterogeneous networks (HetNets). It contains 3 key contributions:
1. Analyzing whether D2D communication can improve throughput in HetNets when small cells reuse the same spectrum as macro cells. A sequential max search algorithm is proposed for resource allocation.
2. Proposing ways to enhance energy efficiency in D2D-powered HetNets through dynamic mode selection, resource allocation, and power control. Both dedicated and reuse modes of D2D communication are considered.
3. Developing a stochastic analytical model to quantify the impact of LTE scheduler type on D2D communication in HetNets.
An Efficient Data Communication Using Conventional Codes
The BER performance of conventional FFT-OFDM system is compared with DWT-OFDM system and DCT-OFDM system in an AWGN environment and Saleh-Valenzuela (SV) channel model at 60 GHz. Several wavelets such as Haar, Daubechies, Symlet, biorthogonal are considered. The BER is calculated for signaling format BPSK and the performance is analyzed at 60 GHz. Simulation results show that DCT based scheme yields the lowest average bit error rate. While out of all wavelet mother used Haar and Daubechies wavelet based scheme yields lower BER than FFT-OFDM for an AWGN channel. But it may include the implementation of forward error correction techniques such as convolution codes. An efficient channel estimation algorithm may be included for performance evaluation of DCT-OFDM and DWT- OFDM working at 60 GHz band. We introduce the Interfacing Techniques for Accessing data transfer data delivery. By using our approach we are increasing the efficiency of the data communication.
LTE optimization
This document describes the design of an LTE network optimization project by a group of students from Taiz University. It includes an introduction to LTE, the network planning process, and LTE system architecture. The network planning section discusses coverage planning including link budget calculations and propagation models, as well as capacity planning considering factors like interference levels and supported modulation schemes. The document also provides an overview of LTE system architecture components including the user equipment, E-UTRAN, EPC, and functions of each. It concludes with a section on LTE radio frequency optimization methods.
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
The document analyzes the system capacity and spectral efficiency of a fixed-grid optical network using different modulation formats. It simulates a fixed-grid network using polarization division multiplexing and transmits 100-200 Gbps data rates using PM-QPSK, PM-8QAM, and PM-16QAM modulation. The achieved spectral efficiencies were 2, 3, and 4 bits/s/Hz respectively. The modulation formats provided system capacities of 8-9, 12-13.5, and 16-18 Tbps, reaching transmission distances of 3000, 1300, and 700 km with a bit error rate below 2x10-3. It examines the received optical power and bandwidth requirements for different modulations in a fixed grid
Broadcast Scheduling Protocols in Multi-Hop Mobile Ad hoc Networks
When packets are sending in multi-hop mobile unintended networks numerous problems occur like flooding, rebroadcast, broadcast latency, power conservation and collision. If multiple transmission of packets simultaneously in MANETs that using the slot assignments approach, when additional channels are transmitting at the same time as the first slot allocations, interference may occur at the nodes. Because of the multi-hops data transfer, the network performance is hampered by the constrained bandwidth and therefore the self-initiated topological alterations. Therefore, a broadcast algorithm is important within the mobile ad hoc network for collision control and reliable communication. This paper proposes two new broadcasting protocols: modify SRBS and DSB algorithms. The planned algorithms outperform context of efficiency, reliability, traffic overload and reachability in highly mobile networks is an enhanced performance within the different environments. Evaluation of simulation results with other well-known exiting protocols as DFCN and PEGSP algorithms shows that the proposed protocol performance is best within the wireless network and channel bandwidths are well utilized within the network.
BROADCAST SCHEDULING PROTOCOLS IN MULTIHOP MOBILE AD HOC NETWORKS
When packets are sending in multi-hop mobile unintended networks numerous problems occur like
flooding, rebroadcast, broadcast latency, power conservation and collision. If multiple transmission of
packets simultaneously in MANETs that using the slot assignments approach, when additional channels are
transmitting at the same time as the first slot allocations, interference may occur at the nodes. Because of
the multi-hops data transfer, the network performance is hampered by the constrained bandwidth and
therefore the self-initiated topological alterations. Therefore, a broadcast algorithm is important within the
mobile ad hoc network for collision control and reliable communication. This paper proposes two new
broadcasting protocols: modify SRBS and DSB algorithms. The planned algorithms outperform context of
efficiency, reliability, traffic overload and reachability in highly mobile networks is an enhanced
performance within the different environments. Evaluation of simulation results with other well-known
exiting protocols as DFCN and PEGSP algorithms shows that the proposed protocol performance is best
within the wireless network and channel bandwidths are well utilized within the network.
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
Carrier aggregation and integration of heterogeneous networks allow the mobile user equipment to benefit from wider bandwidth and radio coverage of different access technologies. However, these technologies have increased handoff scenario probability through user equipment’s mobility, leading to high outage probability and low throughput. Handover is an important aspect of mobility management which allows users to migrate from one cell to another without losing connections. But no lone access technology meets the requirements of providing seamless communication without loss and delay. Therefore, high-quality service continuity and reliable user equipment access to network anywhere and at any time require the
design of an appropriate handover decision algorithm. In this paper, a multi-criteria based handover decision-making algorithm is proposed to evade loss of communication and provide better performance to the system. It adaptively makes handover decisions based on different decision criteria (load, availability of resources, and the handover scenario type) in addition to signal interference to noise ratio. The multicriteria handover decision making algorithm-based method chooses among the cells that satisfy the requirements for the handover. As compared to some existing handover decision algorithms, simulation result shows that this algorithm improves system performance in terms of handover failure by 93%, 72%,
and 58%; radio link failure reduction by 77%, 43%, and 22%; and handover ping–pong by 81%, 59%, and 36% over the conventional received signal strength, received wireless transmission line, and multiinfluence factor hand over decisions respectively.
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
Carrier aggregation and integration of heterogeneous networks allow the mobile user equipment to benefit from wider bandwidth and radio coverage of different access technologies. However, these technologies have increased handoff scenario probability through user equipment’s mobility, leading to high outage probability and low throughput. Handover is an important aspect of mobility management which allows users to migrate from one cell to another without losing connections. But no lone access technology meets the requirements of providing seamless communication without loss and delay. Therefore, high-quality service continuity and reliable user equipment access to network anywhere and at any time require the
design of an appropriate handover decision algorithm. In this paper, a multi-criteria based handover decision-making algorithm is proposed to evade loss of communication and provide better performance to the system. It adaptively makes handover decisions based on different decision criteria (load, availability of resources, and the handover scenario type) in addition to signal interference to noise ratio. The multicriteria handover decision making algorithm-based method chooses among the cells that satisfy the requirements for the handover. As compared to some existing handover decision algorithms, simulation result shows that this algorithm improves system performance in terms of handover failure by 93%, 72%,
and 58%; radio link failure reduction by 77%, 43%, and 22%; and handover ping–pong by 81%, 59%, and 36% over the conventional received signal strength, received wireless transmission line, and multiinfluence factor hand over decisions respectively.
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
In this article, the performance of a fixed grid network is examined for various modulation formats to estimate the system's capacity and spectral efficiency. The optical In-phase Quadrature Modulator (IQM) structure is used to build a fixed grid network modulation, and the homodyne detection approach is used for the receiver. Data multiplexing is accomplished using the Polarization Division Multiplexed (PDM) technology. 100 Gbps, 150 Gbps, and 200 Gbps data rates are transmitted under these circumstances utilizing various modulation formats. Various pre-processing and signal recovery steps are explained by using modern digital signal processing systems. The achieved spectrum efficiencies for PM-QPSK, PM-8 QAM, and PM-16 QAM, respectively, were 2, 3, and 4 (bits/s)/Hz. Different modulation like PM-QPSK, PM-8-QAM, and PM-16-QAM each has system capacities of 8-9, 12-13.5, and 16-18 Tbps and it reaches transmission distances of 3000, 1300, and 700 kilometers with acceptable Bit Error Rate (BER≤ 2× 10-3) respectively. Peak optical power for received signal detection and full width at half maximum is noted for the different modulations under a fixed grind network.
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A bipartite graph based proportional fair scheduling strategy to improve thr...
A bipartite graph based proportional fair scheduling strategy to improve thr...
Design of time division multiplexing/wavelength division multiplexing passiv...
Design of time division multiplexing/wavelength division multiplexing passiv...
Modelling and QoS-Achieving Solution in full-duplex Cellular Systems
Modelling and QoS-Achieving Solution in full-duplex Cellular Systems
DEVICE-TO-DEVICE (D2D) COMMUNICATION UNDER LTE-ADVANCED NETWORKS
DEVICE-TO-DEVICE (D2D) COMMUNICATION UNDER LTE-ADVANCED NETWORKS
Markovian Queueing Model for Throughput Maximization in D2D-Enabled Cellular ...
Markovian Queueing Model for Throughput Maximization in D2D-Enabled Cellular ...
Performance evaluation of VLC system using new modulation approach
Performance evaluation of VLC system using new modulation approach
The Coexistence of Device -to- Device (D2D) Communication under Heterogeneous...
The Coexistence of Device -to- Device (D2D) Communication under Heterogeneous...
An Efficient Data Communication Using Conventional Codes
An Efficient Data Communication Using Conventional Codes
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
Wireless Communication fundamentals and 4G Technology
Wireless Communication fundamentals and 4G Technology
Broadcast Scheduling Protocols in Multi-Hop Mobile Ad hoc Networks
Broadcast Scheduling Protocols in Multi-Hop Mobile Ad hoc Networks
BROADCAST SCHEDULING PROTOCOLS IN MULTIHOP MOBILE AD HOC NETWORKS
BROADCAST SCHEDULING PROTOCOLS IN MULTIHOP MOBILE AD HOC NETWORKS
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
MULTI-CRITERIA HANDOVER DECISION FOR HETEROGENEOUS NETWORKS: CARRIER AGGREGAT...
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network
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International Conference on Telecommunications
This paper proposes a full-duplex device-to-device collaboration scheme for low-latency wireless video distribution in cellular networks. The scheme utilizes cache-enabled user devices and full-duplex radios to bring content closer to users, avoid traffic congestion, and increase throughput and quality of service. The paper analyzes collaboration probabilities, system throughput, and latency for two scenarios: bidirectional full-duplex and three-node full-duplex. Simulation results show improvements in throughput and latency compared to traditional half-duplex systems, with potential for further gains if self-interference is fully canceled.
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Ip addressing
This document provides an overview of network addressing concepts including:
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2. It outlines the different classes of IP addresses (A, B, C, D, E) and their address ranges.
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Millimeter-Waves is a new spectrum range that operators should have a look on it, 5G is coming in 2020 and there is no spectrum in sweet spectrum range for this technology.
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Oqpsk
This document discusses offset quadrature phase-shift keying (OQPSK) modulation. It begins by explaining the drawback of traditional quadrature phase-shift keying (QPSK), which is that both the in-phase and quadrature components change simultaneously, resulting in abrupt 180-degree phase changes and large spectral side lobes. It then introduces OQPSK modulation as a modification of QPSK where the quadrature component is offset by one bit period, preventing simultaneous changes in both components and replacing the 180-degree phase jumps with multiple 90-degree phase shifts. This results in better performance for applications using high power amplifiers or satellites. Diagrams are provided to illustrate the difference between the phase transitions of QPSK and O
NAT Scneario
This document describes network address translation (NAT) and different NAT types. It includes a course on Cisco CCNA about NAT taught at Tehran Institute of Technology. The course covers introduction to NAT and private vs public addresses. It then describes static NAT, dynamic NAT, and port address translation. The document provides examples of configuring static and dynamic NAT on routers to allow internal hosts to access the internet using public IP addresses.
Tele operation systems
I. The document discusses tele-operation systems and the challenges posed by time delays in such systems. It describes various control infrastructure methods that have been developed to address these challenges, including wave variables methods, Smith predictor methods, and sliding mode control methods.
II. The key components of bilateral teleoperation systems are described, including the human operator, master controller, slave manipulator and environment. General issues around communication, control and network infrastructure for teleoperation are also covered.
III. Simulation results are presented demonstrating the position, velocity, force and error responses between the master and slave systems for a teleoperation scenario.
CCNA Routing Protocols
My Cisco Training Courses @ MFT.Info
in this chapter I focused on Routing protocols in CCNA Technologies , consider that this info has been presented @ Workshop Teaching , So if you wanna know more about this scenarios feedback me to give you LAB Scenarios,
good luck.
Basic Configurations on Router
This document is a course document for the Cisco CCNA course taught at the Tehran Institute of Technology. It covers topics such as managing device names and passwords, console and interface configurations, and connecting two routers using point-to-point serial connections either back-to-back or over long distances using CSU/DSU modems. The document provides configuration examples for setting passwords, interface settings like IP addresses and descriptions, and serial interface settings for clock rate and bandwidth.
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“I’m still / I’m still / Chaining from the Block”
“An Outlook of the Ongoing and Future Relationship between Blockchain Technologies and Process-aware Information Systems.” Invited talk at the joint workshop on Blockchain for Information Systems (BC4IS) and Blockchain for Trusted Data Sharing (B4TDS), co-located with with the 36th International Conference on Advanced Information Systems Engineering (CAiSE), 3 June 2024, Limassol, Cyprus.
Generative AI Deep Dive: Advancing from Proof of Concept to Production
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
A tale of scale & speed: How the US Navy is enabling software delivery from l...
Rapid and secure feature delivery is a goal across every application team and every branch of the DoD. The Navy’s DevSecOps platform, Party Barge, has achieved:
- Reduction in onboarding time from 5 weeks to 1 day
- Improved developer experience and productivity through actionable findings and reduction of false positives
- Maintenance of superior security standards and inherent policy enforcement with Authorization to Operate (ATO)
Development teams can ship efficiently and ensure applications are cyber ready for Navy Authorizing Officials (AOs). In this webinar, Sigma Defense and Anchore will give attendees a look behind the scenes and demo secure pipeline automation and security artifacts that speed up application ATO and time to production.
We will cover:
- How to remove silos in DevSecOps
- How to build efficient development pipeline roles and component templates
- How to deliver security artifacts that matter for ATO’s (SBOMs, vulnerability reports, and policy evidence)
- How to streamline operations with automated policy checks on container images
Climate Impact of Software Testing at Nordic Testing Days
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex Proofs
This paper presents Reef, a system for generating publicly verifiable succinct non-interactive zero-knowledge proofs that a committed document matches or does not match a regular expression. We describe applications such as proving the strength of passwords, the provenance of email despite redactions, the validity of oblivious DNS queries, and the existence of mutations in DNA. Reef supports the Perl Compatible Regular Expression syntax, including wildcards, alternation, ranges, capture groups, Kleene star, negations, and lookarounds. Reef introduces a new type of automata, Skipping Alternating Finite Automata (SAFA), that skips irrelevant parts of a document when producing proofs without undermining soundness, and instantiates SAFA with a lookup argument. Our experimental evaluation confirms that Reef can generate proofs for documents with 32M characters; the proofs are small and cheap to verify (under a second).
Paper: https://eprint.iacr.org/2023/1886
Removing Uninteresting Bytes in Software Fuzzing
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
By Design, not by Accident - Agile Venture Bolzano 2024
As presented at the Agile Venture Bolzano, 4.06.2024
Goodbye Windows 11: Make Way for Nitrux Linux 3.5.0!
As the digital landscape continually evolves, operating systems play a critical role in shaping user experiences and productivity. The launch of Nitrux Linux 3.5.0 marks a significant milestone, offering a robust alternative to traditional systems such as Windows 11. This article delves into the essence of Nitrux Linux 3.5.0, exploring its unique features, advantages, and how it stands as a compelling choice for both casual users and tech enthusiasts.
Elizabeth Buie - Older adults: Are we really designing for our future selves?
Elizabeth Buie - Older adults: Are we really designing for our future selves?
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zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex Proofs
zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex Proofs
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By Design, not by Accident - Agile Venture Bolzano 2024
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Goodbye Windows 11: Make Way for Nitrux Linux 3.5.0!
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Elizabeth Buie - Older adults: Are we really designing for our future selves?
Efficient resource allocation for device to-device
- 1. Efficient Resource Allocation for Device-to-Device Communication Underlaying LTE Network Course name: Mobile Communications Advisor: Dr. Ghorashi Lecturer: M. Naslcheraghi April, 2015
- 2. Network Model Evolved Packet Core (EPC) Mobility Management Entity (MME) Serving Gateway (SGW) packet data network (PDN) Packet Gateway (P-GW)
- 3. Radio Resource and Access Technology LTE has adopted Orthogonal Frequency Division Multiplex (OFDM) multiple access scheme for DL (from eNodeB to UEs) is OFDM access (OFDMA) The radio access technology in UL is single carrier frequency division multiple access (SC-FDMA)
- 4. Channel Model • distant dependent macroscopic pathloss and shadow fading pathloss: • radiation pattern: • Total Pathloss: • The linear gain between the eNodeB and UE: • For D2D communication, the gain between two Ues:
- 5. PROBLEM DEFINITION intelligent selection of the shared RB would result in better performance in termsof network throughput We deny D2D connections if the the maximum distance between D2D is higher than 25m
- 9. Pathloss and Shadow fading
- 10. CQI , SINR, MCS • SINR is calculated from the received signal power and interference power level. • CQI are calculated from the SINRs at the UEs and then fed back to eNodeB. • modulation and coding schemes (MCS) (QPSK, 16QAM, 64QAM) are considered with varying coding rates ranging from 1/8 to 4/5.
- 11. RBs, Scheduling, Throuput • number of RBs is 100 for 20MHz bandwidth. UL and DL bandwidth is divided equally into m RBs. • Three different scheduling algorithms are employed for the primary cellular network: Round Robin (RR), Maximum Carrier to Interference ratio (Max C/I) and Proportional Fair (PF) with CQI feedback. • The throughput is calculated by mapping the SINR to the ideal link- adaptation based LTE link-level capacity as follows:
- 12. RESULTS – Scenario 1
- 13. RESULTS – Scenario 2
- 14. Comparisons between random and heuristic D2D RB as-signment algorithms
- 15. Impact of number of D2D connections on network through-put
- 16. CONCLUSION • The network performance improves when D2D communications share radio resources with the primary network. However, D2D transmitter causes interference to the UE receiver during the DL period and to the mmobile eNodeB during the UL phase. • greedy heuristic algorithm improves network performance in terms sum of cell and D2D throughput without causing significance harm to the primary cellular network for all standard scheduling algorithms of the primary network. • With the increase of D2D connections, although the cell throughput has decreased, the sum of cell and D2D throughput has increased significantly with the proposed algorithm. • As • the eNodeB remains in control of D2D connections, D2D communication is a promising integration for LTE Advanced network.
- 17. Reference • Efficient Resource Allocation for Device-to-Device Communication Underlaying LTE Network, 2010 IEEE 6th International Conference on Wireless and Mobile Computing, Networking and Communications 978-1-4