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检索条件"任意字段=14th ACM Symposium on Access Control Models and Technologies"

共 462 条记录，以下是191-200 订阅

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IEEE 802.11 DCF MAC Protocol for Cognitive Radio Networks: Cooperative Basic access Vs RTS/CTS 14

IEEE 802.11 DCF MAC Protocol for Cognitive Radio Networks: C...

引用

International symposium on Communications and Information technologies

作者： Dappuri, Bhasker Venkatesh, T. G. Indian Inst Technol Madras Dept Elect Engn Madras 600036 Tamil Nadu India

ISBN: (纸本)9781479944163

In this paper we study the role of control/status channel in MAC protocol of cognitive radio networks. To this end we consider three channel access schemes of IEEE 802.11 DCF namely (i) the Basic access mechanism that uses no control channel and (ii) RTS-CTS mechanism, that uses a control channel for contention and (iii) cooperative Basic access scheme that uses a dedicated channel for status update. We calculate and compare different metrics like throughput, mean delay, dropped packets etc of secondary users through extensive simulation.

关键词： Cognitive Radio IEEE 802.11 MAC protocol Wireless LAN Simulation

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Adaptive flow control proxy for enhancing downlink TCP throughput in infrastructure WLANs 14

Adaptive flow control proxy for enhancing downlink TCP throu...

引用

14th International symposium on Communications and Information technologies, ISCIT 2014

作者： Jian, Zhang Tianhao, Guo Jilong, Liu Mingwu, Yao School of Telecommunications Engineering Xidian University Xi'an China

ISBN: (纸本)9781479944163

WLANs (Wireless Local Area Networks) are widely used for Internet access. But the WLANs in locations such as airports and large conventions usually suffer poor performance in terms of downlink TCP (Transmission control Protocol) throughput To alleviate these problems, we propose an AFCP (Adaptive Flow control Proxy) approach, which acts like a TCP Proxy and monitors the traffic flowing through the AP. Using NS-3 simulations, we demonstrate that AFCP can improve the downlink TCP performance, provide good uplink/downlink fairness and promote the total throughput of WLAN. © 2014 IEEE.

关键词： Transmission control protocol

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What Are the Most Important Challenges for access control in New Computing Domains, such as Mobile, Cloud and Cyber-physical Systems? 14

What Are the Most Important Challenges for Access Control in...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Bauer, Lujo Kerschbaum, Florian Carnegie Mellon Univ Pittsburgh PA 15213 USA SAP Karlsruhe Germany

ISBN: (纸本)9781450329392

We are seeing a significant shift in the types and characteristics of computing devices that are commonly used. Today, more smartphones are sold than personal computers. An area of rapid growth are also cloud systems; and our everyday lives are invaded by sensors like smart meters and electronic tickets. the days when most computing resources were managed directly by a computer's operating system are over---data and computation is distributed, and devices are typically always connected via the *** light of this shift, it is important to revisit the basic security properties we desire of computing systems and the mechanisms that we use to provide them. A building block of most of the security we enjoy in today's systems is access control. this panel will examine the challenges we face in adapting the access control models, techniques, and tools produced thus far to today's and tomorrow's computing environments. Key characteristics of these new systems that may require our approach to access control to change is that in many (e.g., cloud) systems users do not directly control their data; that a vast population of users operating mobile and other new devices has very little education in their use; and that cyber-physical systems permeate our environment to the point where they are often invisible to their *** control comprises enforcement systems, specification languages, and policy-management tools or approaches. In each of these areas the shifting computing landscape leaves us examining how current technology can be applied to new contexts or looking for new technology to fill the gap. Enforcement of access-control policy based on a trusted operating system, for example, does not cleanly translate to massively distributed, heterogeneous computing environments; to environments with many devices that are minimally administered or administered with minimal expertise; and to potentially untrusted clouds that hold sensitive data and computations that belo

关键词： Panel access control Challenges

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Adaptive Flow control Proxy for Enhancing Downlink TCP throughput in Infrastructure WLANs

Adaptive Flow Control Proxy for Enhancing Downlink TCP Throu...

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International symposium on Communications and Information technologies

作者： Zhang Jian Guo Tianhao Liu Jilong Yao Mingwu Xidian Univ Sch Telecommun Engn Xian Peoples R China

ISBN: (纸本)9781479944163

WLANs (Wireless Local Area Networks) are widely used for Internet access. But the WLANs in locations such as airports and large conventions usually sutTer poor perfonnance in terms of downlink TCP (Transmission control Protocol) throughput. To alleviate these problems, we propose an AFCP (Adaptive Flow control Proxy) approach, which acts like a TCP Proxy and monitors the traffic flowing through the AP. Using NS-3 simulations, we demonstrate that AFCP can improve the downlink TCP perfonnance, provide good uplink/downlink fairness and promote the total throughput of WLAN.

关键词： TCP uplink/downlink fairness IEEE 802.11 AFCP infrastructure WLAN NS-3

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A Novel Scheme to Ease the Problem of OBSS Networks Based on Admission control and TPC 14

A Novel Scheme to Ease the Problem of OBSS Networks Based on...

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International symposium on Communications and Information technologies

作者： Wu, Jie Jiang, Ting Beijing Univ Posts & Telecommun Key Lab Univ Wireless Commun Beijing Peoples R China

ISBN: (纸本)9781479944163

Since wireless local area network (WLAN) can support high transmission rate with low cost, the use of WLAN is increasing rapidly. the WLAN has become very congested, and in the dense environment, Overlapping BSS (basic set service) problem may be introduced, which will severely degrade the performance of the network. Transmission power control (TPC) of AP (access Point) is considered as one of the techniques which can relieve the problem. We proposed a novel scheme to ease the OBSS problem mainly based on admission control (AC) and transmission power control. Besides in our scheme we also consider load balancing among APs to improve system performance. Ongoing NS2 simulations demonstrate that the scheme that we proposed is more effective than traditional 802.11 scheme.

关键词： WLAN OBSS problem transmission power control load balancing

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MAC Protocol Designs for OFDMA-PONs 14

MAC Protocol Designs for OFDMA-PONs

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International symposium on Communications and Information technologies

作者： Lim, Wansu Shin, Seokjoo Yang, Yeon-Mo Kumoh Natl Inst Technol Sch Elect Engn 61 Daehak Ro Yangho Dong Gumi 730701 Gyeongbuk South Korea Chosun Univ Dept Comp Engn Gwangju 501759 South Korea

ISBN: (纸本)9781479944163

this paper provides specifications of the parameters defining the design of medium access control (MAC) protocols for orthogonal frequency division multiple access (OFDMA) passive optical networks (PONs). Network architecture has been designed for MAC evaluation based on the wired-wireless converged topology, extendable in reach, subcarriers and optical network units (ONUs), the upstream and downstream bitrates and modulation formats and the explored bandwidth allocation schemes. Dynamic bandwidth allocation (DBA) in synergy with queue scheduling in ONUs, can handle rapidly fluctuating traffic while decreasing packet delay. the former is achieved using the granularity of OFDMA and time division multiple access (TDMA) sustained by capacity control. the foreseen functionalities have been attained by the extension of the upcoming 10-Gigabit-capable passive optical network (XG-PON) frame structures. the MAC requirements enabling wireless backhauling are uniquely explored with respect to centralization at the Optical Line Terminal (OLT).

关键词： Next generation access networks orthogonal frequency division multiplexing (OFDM) passive optical networks (PONs) medium access control (MAC) protocol

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A Dynamic Risk-based access control Architecture for Cloud Computing

A Dynamic Risk-based Access Control Architecture for Cloud C...

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14th IEEE/IFIP Network Operations and Management symposium (NOMS)

作者： dos Santos, Daniel Ricardo Westphall, Carla Merkle Westphall, Carlos Becker Univ Fed Santa Catarina Networks & Management Lab Florianopolis SC Brazil

ISBN: (纸本)9781479909131

Cloud computing is a distributed computing model that still faces problems. New ideas emerge to take advantage of its features and among the research challenges found in the cloud, we can highlight Identity and access Management. the main problems of the application of access control in the cloud are the necessary flexibility and scalability to support a large number of users and resources in a dynamic and heterogeneous environment, with collaboration and information sharing needs. this paper proposes the use of risk-based dynamic access control for cloud computing. the proposal is presented as an access control model based on an extension of the XacmL standard with three new components: the Risk Engine, the Risk Quantification Web Services and the Risk Policies. the risk policies present a method to describe risk metrics and their quantification, using local or remote functions. the risk policies allow users and cloud service providers to define how to handle risk-based access control for their resources, using different quantification and aggregation methods. the model reaches the access decision based on a combination of XacmL decisions and risk analysis. A prototype of the model is implemented, showing it has enough expressivity to describe the models of related work. In the experimental results, the prototype takes between 2 and 6 milliseconds to reach access decisions using a risk policy. A discussion on the security aspects of the model is also presented.

关键词： Cloud computing

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Delay Efficient Emergency access control Protocol in Medical Implant Communication 14

Delay Efficient Emergency Access Control Protocol in Medical...

引用

International symposium on Communications and Information technologies

作者： thapa, Anup Kwak, Kyung Sup Inha Univ Dept Informat & Commun Inchon South Korea

ISBN: (纸本)9781479944163

In order to find out current operating channel of the hub during emergency in medical implant communication, an implant node sequentially sends an empty frame in all the available channels until it receives an acknowledgement. the channel scanning process by sending an empty frame in advance, however, adds higher overhead if the probability of transmission in the correct channel is high and/or payload size is small. In such scenario, the direct data transmission technique in which node transmits data directly without empty frame in advance could exhibit better performance. In this paper, to save emergency packet suffering from inappropriate delay, we propose to use these two transmission schemes adaptively. Nodes select their transmission mode by taking into account both the probability of successful transmission and the payload size. We find payload threshold value that serves as switching criterion between two schemes during various network conditions. through rigorous analysis and simulation, we show that the proposed scheme significantly enhances the delay performance.

关键词： access control

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Re-thinking Networked Privacy, Security, Identity and access control in our Surveillance States 14

Re-thinking Networked Privacy, Security, Identity and Access...

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19th acm symposium on access control models and technologies (SacmAT)

作者： Clement, Andrew Univ Toronto Fac Informat 140 St George St Toronto ON M5S 3G6 Canada

ISBN: (纸本)9781450329392

Mass surveillance activities by the security agencies of the Five Eyes countries (e.g. NSA, CSEC, etc) pose a significant challenge to those who care about the privacy, security and other democratic rights related to our burgeoning digitally mediated communications. the on-going media coverage of the Snowden documents has brought unprecedented attention to longstanding concerns about whether and how individuals can exercise effective control over their personal information as we increasingly lead our lives on-line. the revelations are also undermining comfortable assumptions about the institutions and infrastructures we depend on for the efficient and equitable functioning of a democratic society. We've seen agencies mandated to protect our networks compromise once trusted security standards, and secretly hoard vulnerabilities for later exploitation rather than fix them. We are witnesses to government and their corporate partners secretly accessing massive amounts of our data, and grudgingly acknowledge their activities only when forced to by whistleblowers. How can we restore trust in the organizations we interact with and hand our personal data to on a daily basis? How can we require them to be more open, transparent and accountable? What are the technically viable options that can help achieve the reliable protections that many regard as fundamental and wish they could take for granted?Drawing on recent research, this talk will review some of the key surveillance challenges we face in the areas of internet routing and identity authentication. the *** project provides a mapping tool for visualizing the routes data packets take across the internet backbone, and in particular where one's own traffic may be subject to NSA interception at key internet routing choke points. It further documents patterns of "boomerang routing", whereby domestic Canadian traffic is often routed via the US, exposing it to foreign surveillance, and compares the data privacy transpare

关键词： Surveillance Privacy Security

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iA-MAC: improved Adaptive Medium access control protocol for Wireless Body Area Networks 14

iA-MAC: improved Adaptive Medium Access Control protocol for...

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International symposium on Communications and Information technologies

作者： Ahmad, Ashfaq Javaid, Nadeem Khan, Zahoor Ali Imran, Muhammad Alnuem, Mohammed COMSATS Inst Informat Technol Islamabad Pakistan Dalhousie Univ FE Internetworking Program Halifax NS Canada King Saud Univ Coll Comp & Informat Sci Ryadh Saudi Arabia

ISBN: (纸本)9781479944163

this paper presents improved Adaptive Medium access control (iA-MAC) protocol for Wireless Body Area Networks (WBANs). In addition to the adaptive guard band assignment technique, the newly proposed protocol has an improved as well as adaptive sleep/wakeup mechanism. We consider a simple temperature measuring application, where sensors (nodes) sense human body for updated information. If the current readings are within normal range, nodes stay in idle state (do not access channel). On the other hand, if the current sensed information is within high range then nodes switch to active state and access the channel because critical information needs to be transmitted as soon as possible. Besides the normal and high ranges of temperature, if the current sensed temperature lies with pre-high range then nodes access for channel if and only if the current sensed data is not duplicated version of the previously sensed data. Moreover, iA-MAC uses well defined synchronization mechanism to avoid collisions between data as well as control packets. Simulation results show that performance of the newly proposed iA-MAC protocol is better than its existing counter part protocols in terms of the selected performance metrics.

关键词： Channel access TDMA Wireless Body Sensor Networks IEEE 802.15.4

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