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University of California
(1019 results)-
White Papers
Data Café: A Dining Car Approach to Educational Research Data Management and Distribution
October 21, 2009, 12:00am PDT
Researchers are investigating the effect of technology-supported instructional methods on the learning process. One team investigating this effect is the Technology In Education (TIE) group at the...
Provided by University of California
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White Papers
SCUBA: Focus and Context for Real-Time Mesh Network Health Diagnosis
February 7, 2008, 12:00am PST
Large-scale wireless metro-mesh networks consisting of hundreds of routers and thousands of clients suffer from a plethora of performance problems. The sheer scale of such networks, the abundance...
Provided by University of California
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White Papers
Pseudo-IP: Providing a Thin Network Layer Protocol for Semi-Intelligent Wireless Devices
January 1, 2011, 12:00am PST
In the near future users will be able to move freely and still have seamless network and Internet connectivity. The authors envision that the Internet of the future will interconnect mobile or...
Provided by University of California
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White Papers
New Adversary and New Threats: Security in Unattended Sensor Networks
January 15, 2009, 12:00am PST
Some Wireless Sensor Networks (WSNs) preclude constant presence of a centralized data collection point, i.e., a sink. In such a disconnected or unattended setting, nodes must accumulate sensed...
Provided by University of California
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White Papers
Privacy-Preserving Revocation Checking
August 13, 2008, 12:00am PDT
Digital certificates signed by trusted Certification Authorities (CAs) are used for multiple purposes, most commonly for secure binding of public keys to names and other attributes of their...
Provided by University of California
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White Papers
PRISM: Privacy-Friendly Routing in Suspicious MANETs (and VANETs)
September 4, 2008, 12:00am PDT
Mobile Ad-Hoc Networks (MANETs) are particularly useful and well-suited for critical scenarios, including military, law enforcement as well as emergency rescue and disaster recovery. When...
Provided by University of California
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White Papers
ABBA: A Balls and Bins Approach to Secure Aggregation in WSNs
June 3, 2008, 12:00am PDT
Sensor networks pledge to solve many monitoring problems: thousands of small inexpensive devices can be easily deployed in any environment and can provide measurements about diverse phenomenons,...
Provided by University of California
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White Papers
ALARM: Anonymous Location-Aided Routing in Suspicious MANETs
September 3, 2007, 12:00am PDT
In many traditional mobile network scenarios, nodes establish communication on the basis of persistent public identities. However, in some hostile and suspicious MANET settings, node identities...
Provided by University of California
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White Papers
Readers Behaving Badly Reader Revocation in PKI-Based RFID Systems
June 28, 2010, 12:00am PDT
Recent emergence of RFID tags capable of performing public key operations motivates new RFID applications, including electronic travel documents, identification cards and payment instruments. In...
Provided by University of California
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White Papers
Enhancing Data Privacy in the Cloud
January 20, 2011, 12:00am PST
Due to its low cost, robustness, flexibility and ubiquitous nature, cloud computing is changing the way entities manage their data. However, various privacy concerns arise whenever potentially...
Provided by University of California
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White Papers
BEDA: Button-Enabled Device Association
July 22, 2007, 12:00am PDT
Secure initial pairing of electronic gadgets is a challenging problem because of the usual lack of a common security infrastructure and the threat of so-called Man-in-The-Middle (MiTM) attacks,...
Provided by University of California
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White Papers
Link-Layer Encryption Effect on Achievable Capacity in Wireless Network Coding
March 8, 2010, 12:00am PST
In recent years, network coding has been enthusiastically promoted for certain wireless settings as a means of improving throughput and achieving higher capacity. Naturally, such proposals focused...
Provided by University of California
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White Papers
Linear-Complexity Private Set Intersection Protocols Secure in Malicious Model
September 3, 2010, 12:00am PDT
Private Set Intersection (PSI) protocols allow one party ("Client") to compute an intersection of its input set with that of another party ("Server"), such that the client learns nothing other...
Provided by University of California
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White Papers
P4P: Practical Large-Scale Privacy-Preserving Distributed Computation Robust Against Malicious Users
May 31, 2010, 12:00am PDT
In this paper the authors introduce a framework for privacy preserving distributed computation that is practical for many real-world applications. The framework is called Peers for Privacy (P4P)...
Provided by University of California
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White Papers
Should Users Be Entitled to Run the Applications of Their Choice on Wireless Networks?
November 30, 2010, 12:00am PST
The authors examine whether wireless ISPs should be able to legally limit the applications used on wireless devices. The analysis is based on wireless network architecture and communications law....
Provided by University of California
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White Papers
Dynamic Resource Discovery for Wireless Sensor Networks
January 1, 2011, 12:00am PST
As sensor networks mature and are increasingly deployed, they will play an integral role in everyday life as the interface between the physical and digital worlds. In contrast to the current...
Provided by University of California
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White Papers
Reverse Traceroute
November 10, 2009, 12:00am PST
Traceroute is the most widely used Internet diagnostic tool today. Network operators use it to help identify routing failures, poor performance, and router misconfigurations. Researchers use it to...
Provided by University of California
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White Papers
Automatic Mutual Exclusion and Atomicity Checks
February 25, 2008, 12:00am PST
This paper provides an introduction to the Automatic Mutual Exclusion (AME) programming model and to its formal study, through the AME calculus. AME resembles cooperative multithreading; in the...
Provided by University of California
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White Papers
Automated Verification of Selected Equivalences for Security Protocols
July 11, 2007, 12:00am PDT
In the analysis of security protocols, methods and tools for reasoning about protocol behaviors have been quite effective. The authors aim to expand the scope of those methods and tools. They...
Provided by University of California
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White Papers
Code-Carrying Authorization
July 11, 2008, 12:00am PDT
In authorization, there is often a wish to shift the burden of proof to those making requests, since they may have more resources and more specific knowledge to construct the required proofs. The...
Provided by University of California
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White Papers
Guessing Attacks and the Computational Soundness of Static Equivalence
July 24, 2009, 12:00am PDT
The indistinguishability of two pieces of data (or two lists of pieces of data) can be represented formally in terms of a relation called static equivalence. Static equivalence depends on an...
Provided by University of California
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White Papers
Logic in Access Control
June 4, 2009, 12:00am PDT
Access control is central to security in computer systems. Over the years, there have been many efforts to explain and to improve access control, sometimes with logical ideas and tools. This paper...
Provided by University of California
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White Papers
AppScale Design and Implementation
January 27, 2009, 12:00am PST
Cloud Computing is a term coined for a recent trend toward service-oriented cluster computing. From a user's perspective, it is an attractive utility-computing paradigm based on Service-Level...
Provided by University of California
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White Papers
MTM2: Scalable Memory Management for Multi-Tasking Managed Runtime Environments
April 30, 2008, 12:00am PDT
Multi-tasking, Managed Runtime Environments (MREs) for modern type-safe, object-oriented programming languages enable isolated, concurrent execution of multiple applications within a single...
Provided by University of California
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White Papers
FIRE: FInding Rogue nEtworks
June 10, 2010, 12:00am PDT
For many years, online criminals have been able to conduct their illicit activities by masquerading behind disreputable Internet Service Providers (ISPs). For example, organizations such as the...
Provided by University of California
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White Papers
Eucalyptus : A Technical Report on an Elastic Utility Computing Archietcture Linking Your Programs to Useful Systems
August 24, 2008, 12:00am PDT
Utility computing, elastic computing, and cloud computing are all terms that refer to the concept of dynamically provisioning processing time and storage space from a ubiquitous "Cloud" of...
Provided by University of California
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White Papers
Control Plane for Advance Bandwidth Scheduling in Ultra High-Speed Networks
January 1, 2011, 12:00am PST
An increasing number of large-scale science and commercial applications are producing colossal amounts of data, on the order of terabytes currently and petabytes in the near future. Since the data...
Provided by University of California
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White Papers
Bayesian Inference for Queueing Networks and Modeling of Internet Services
August 4, 2010, 12:00am PDT
Modern Internet services, such as those at Google, Yahoo!, and Amazon, handle billions of requests per day on clusters of thousands of computers. Because these services operate under strict...
Provided by University of California
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White Papers
An Efficient CDMA Decoder for Correlated Information Sources
January 28, 2010, 12:00am PST
The authors consider the detection of correlated information sources in the ubiquitous Code-Division Multiple-Access (CDMA) scheme. They propose a message-passing based scheme for detecting...
Provided by University of California
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White Papers
The Theory of Intervention Games for Resource Sharing in Wireless Communications
January 16, 2011, 12:00am PST
This paper develops a game-theoretic framework for the design and analysis of a new class of incentive schemes called intervention schemes. The authors formulate intervention games, propose a...
Provided by University of California
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White Papers
Peer-to-Peer Multimedia Sharing Based on Social Norms
February 4, 2011, 12:00am PST
Empirical data shows that in the absence of incentives, a peer participating in a Peer-to-Peer (P2P) network wishes to download content, while avoiding to contribute content in return. This...
Provided by University of California
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White Papers
Fairness Provision in the IEEE 802.11e Infrastructure Basic Service Set
September 13, 2007, 12:00am PDT
Most of the deployed IEEE 802.11e Wireless Local Area Networks (WLANs) use infrastructure Basic Service Set (BSS) in which an Access Point (AP) serves as a gateway between wired and wireless...
Provided by University of California
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White Papers
Hybrid Feature Tracking and User Interaction for Markerless Augmented Reality
January 1, 2008, 12:00am PST
The authors describe a novel markerless camera tracking approach and user interaction methodology for Augmented Reality (AR) on unprepared tabletop environments. They propose a real-time system...
Provided by University of California
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White Papers
On Myopic Sensing for Multi-Channel Opportunistic Access: Structure, Optimality, and Performance
November 5, 2008, 12:00am PST
The authors consider a multi-channel opportunistic communication system where the states of these channels evolve as independent and statistically identical Markov chains (the Gilbert-Elliot...
Provided by University of California
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White Papers
Distributed Fair Scheduling Using Variable Transmission Lengths in Carrier-Sensing-Based Wireless Networks
December 12, 2007, 12:00am PST
The fairness of IEEE 802.11 wireless networks (including Wireless LAN and Ad-hoc networks) is hard to predict and control because of the randomness and complexity of the MAC contentions and...
Provided by University of California
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White Papers
A New Theoretic Foundation for Cross-Layer Optimization
December 14, 2007, 12:00am PST
Cross-layer optimization solutions have been proposed in recent years to improve the performance of network users operating in a time-varying, error-prone wireless environment. However, these...
Provided by University of California
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White Papers
On the Capacity of Non-Coherent Network Coding
November 16, 2010, 12:00am PST
The authors consider the problem of multicasting information from a source to a set of receivers over a network where intermediate network nodes perform randomized network coding operations on the...
Provided by University of California
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White Papers
Strong Robustness of Randomized Rumor Spreading Protocols
March 11, 2010, 12:00am PST
Randomized rumor spreading is a classical protocol to disseminate information across a network. At SODA 2008, a quasirandom version of this protocol was proposed and competitive bounds for its...
Provided by University of California
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White Papers
Interference Alignment on the Deterministic Channel and Application to Fully Connected AWGN Interference Networks
November 16, 2007, 12:00am PST
An interference alignment example is constructed for the deterministic channel model of the K user interference channel. The deterministic channel example is then translated into the Gaussian...
Provided by University of California
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White Papers
Degrees of Freedom of Wireless X Networks
November 19, 2007, 12:00am PST
The authors explore the degrees of freedom of M×N user wireless X networks, i.e. networks of M transmitters and N receivers where every transmitter has an independent message for every receiver....
Provided by University of California
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White Papers
On the Throughput Capacity of Random Wireless Networks
January 1, 2011, 12:00am PST
The authors consider the problem of how throughput in a wireless network with randomly located nodes scales as the number of users n grows. Their results rely on percolation theory arguments. When...
Provided by University of California
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White Papers
On the Sum-Capacity With Successive Decoding in Interference Channels
May 31, 2011, 12:00am PDT
In this paper, the authors investigate the sum-capacity of the two-user Gaussian interference channel with Gaussian superposition coding and successive decoding. They first examine an approximate...
Provided by University of California
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White Papers
A Path Loss Model for Non-Line-of-Sight Ultraviolet Multiple Scattering Channels
March 30, 2010, 12:00am PDT
An UltraViolet (UV) signal transmission undergoes rich scattering and strong absorption by atmospheric particulates. The authors develop a path loss model for a Non-Line-Of-Sight (NLOS) link. The...
Provided by University of California
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White Papers
VAPR: Void Aware Pressure Routing Protocol
August 20, 2010, 12:00am PDT
UnderWater Acoustic Sensor Networks (UW-ASNs) have lately been suggested as a potent means of supporting aquatic applications ranging from environmental monitoring to intrusion detection. A bevy...
Provided by University of California
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White Papers
GeoServ: A Distributed Urban Sensing Platform
December 7, 2010, 12:00am PST
Urban sensing where mobile users continuously gather, process, and share location-sensitive sensor data (e.g., street images, road condition, traffic flow) is emerging as a new network paradigm of...
Provided by University of California
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White Papers
ASCENT: Adaptive Self-Configuring SEnsor Networks Topologies
January 1, 2011, 12:00am PST
Advances in micro-sensor and radio technology will enable small but smart sensors to be deployed for a wide range of environmental monitoring applications. The low per-node cost will allow these...
Provided by University of California
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White Papers
Cooperative MAC for Rate Adaptive Randomized Distributed Space-Time Coding
August 15, 2008, 12:00am PDT
In a distributed wireless network, it is possible to employ several relays and mimic a multiple antenna transmission system. In this paper, the authors propose a MAC layer solution that allows...
Provided by University of California
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White Papers
Experimental Analysis of Scheduling Algorithms for Aggregated Links
June 6, 2008, 12:00am PDT
The authors consider networks with aggregated links that is networks in which physical link segments between two interconnected devices are grouped into a single logical link. Network devices...
Provided by University of California
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White Papers
Efficient Computation of Queueing Delay at a Network Port From Output Link Packet Traces
June 24, 2010, 12:00am PDT
Current Internet core routers provide enough buffer capacity at each output port to keep the link busy for 250 msec. to avoid disrupting TCP flows because of dropped packets. Since link speeds are...
Provided by University of California
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White Papers
Bandwidth Aggregation for Real-Time Applications in Heterogeneous Wireless Networks
January 14, 2009, 12:00am PST
A variety of wireless interfaces are available for today's mobile user to access Internet content. When coverage areas of these different technologies overlap, a terminal equipped with multiple...
Provided by University of California
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White Papers
Reliable Symbol Synchronization in Software-Driven Acoustic Sensor Networks
July 31, 2007, 12:00am PDT
Symbol synchronization in traditional hardware driven communication systems has relied on the transmission of training sequences of symbols just before the beginning of the frame symbols. The use...
Provided by University of California
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White Papers
Design Considerations for Deploying Underwater Sensor Networks
August 1, 2007, 12:00am PDT
The reliance of underwater network deployments on specialized hardware for acoustic communication and modulation has impeded wide scale deployments of underwater sensor networks. This paper...
Provided by University of California
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White Papers
Distributed Rule-Regulated Spectrum Sharing
June 19, 2008, 12:00am PDT
Dynamic spectrum access is a promising technique to use spectrum efficiently. Without being restricted to any prefixed spectrum bands, nodes choose operating spectrum on-demand. Such flexibility,...
Provided by University of California
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White Papers
Towards Real-Time Dynamic Spectrum Auctions
June 19, 2008, 12:00am PDT
In this paper, the authors propose a low-complexity auction framework to distribute spectrum in real-time among a large number of wireless users with dynamic traffic. Their design consists of a...
Provided by University of California
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White Papers
Physical Interference Driven Dynamic Spectrum Management
October 17, 2008, 12:00am PDT
Dynamic spectrum management can drastically improve the performance of wireless networks struggling under increasing user demands. However, performing efficient spectrum allocation is a complex...
Provided by University of California
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White Papers
Traffic-Driven Dynamic Spectrum Auctions
March 26, 2009, 12:00am PDT
Wireless growth has been limited by the shortage of radio spectrum. While the spectrum assigned to legacy technologies remain unused, new prominent technologies such as Mesh/Wi-Fi networks are...
Provided by University of California
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White Papers
Optimus: SINR-Driven Spectrum Distribution Via Constraint Transformation
March 7, 2010, 12:00am PST
The fast, organic growth of wireless networks has created a challenging problem: "How to distribute radio spectrum among network nodes on-demand while avoiding harmful interference?" This spectrum...
Provided by University of California
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White Papers
The Impact of Frequency-Agility on Dynamic Spectrum Sharing
March 7, 2010, 12:00am PST
Designed to adapt spectrum usage on-the-fly, frequency-agile radios can drastically improve performance of wireless networks. Such flexibility, however, comes with a cost of increased hardware...
Provided by University of California
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White Papers
Operator Placement for Snapshot Multi-Predicate Queries in Wireless Sensor Networks
March 14, 2009, 12:00am PDT
This paper aims at minimize the cost of answering snapshot multi-predicate queries in high-communication-cost networks. High-Communication-Cost (HCC) networks is a family of networks where...
Provided by University of California
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White Papers
A Distributed Technique for Dynamic Operator Placement in Wireless Sensor Networks
March 23, 2010, 12:00am PDT
The authors present an optimal distributed algorithm to adapt the placement of a single operator in high communication cost networks, such as a wireless sensor network. Their parameter-free...
Provided by University of California
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White Papers
Nonparametric Belief Propagation for Distributed Tracking of Robot Networks With Noisy Inter-Distance Measurements
November 22, 2009, 12:00am PST
The authors consider the problem of tracking multiple moving robots using noisy sensing of inter-robot and inter-beacon distances. Sensing is local: there are three fixed beacons at known...
Provided by University of California
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White Papers
An Aggregate Network Abstraction for Mobile Devices
September 28, 2009, 12:00am PDT
Mobile devices, as a norm, are equipped with multiple network interfaces, viz. cellular, Wi-Fi and Bluetooth, with Wi-Max networks on the horizon. The authors´ measurement data of connectivity...
Provided by University of California
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White Papers
Distributed ECN-Based Congestion Control
February 25, 2009, 12:00am PST
Following the design philosophy of XCP, VCP is a router-assisted congestion protocol that intends to balance the efficiency and the fairness control in high Bandwidth-Delay Product networks. While...
Provided by University of California
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White Papers
LA-MAC: A Load Adaptive MAC Protocol for MANETs
August 14, 2009, 12:00am PDT
The performance of prevalent MAC protocols in MANETs relies on the level of contention in networks. While contention-based MAC protocols such as CSMA suffer from inefficiency under high...
Provided by University of California
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White Papers
DCP-EW: Distributed Congestion-Control Protocol for Encrypted Wireless Networks
October 1, 2009, 12:00am PDT
VCP suffers from a relatively low speed of convergence and exhibits biased fairness in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback. Their...
Provided by University of California
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White Papers
Cooperative Jamming and Power Allocation for Wireless Relay Networks in Presence of Eavesdropper
September 17, 2010, 12:00am PDT
Relying on physical layer security is an attractive alternative of utilizing cryptographic algorithms at upper layers of protocol stack for secure communications. In this paper, the authors...
Provided by University of California
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White Papers
MAC/PHY Cross-Layer Design and Analysis for Multiple Packet Detector MIMO
September 29, 2009, 12:00am PDT
Coping with collisions is one of the biggest challenges in the design of MAC algorithms for wireless networks. Recent advances in MIMO communications have provided the possibility of decoding...
Provided by University of California
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White Papers
Robust EKF-Based Wireless Congestion Control
September 28, 2009, 12:00am PDT
Many of the recently proposed high performance congestion control protocols rely on an estimation of the available link bandwidths. Specially, XCP and VCP need an explicit knowledge of the link...
Provided by University of California
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White Papers
Rate-Optimal Video Transmission Over MIMO Channels
June 9, 2010, 12:00am PDT
In this paper, the authors propose a low complexity method for optimal video transmission over a quasi-static Rayleigh fading channel utilizing multiple transmit and receive antennas. Under the...
Provided by University of California
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White Papers
A Hybrid Cross-Layer Routing Protocol for MANETs
May 5, 2011, 12:00am PDT
Wireless link effects impose unique challenges to routing protocols in Mobile Ad Hoc NETworks (MANETs). In this paper, the authors propose Hybrid Cross-Layer Routing (HCLR) protocol designed and...
Provided by University of California
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White Papers
Layered Media Multicast Control (LMMC): Real-Time Error Control
January 1, 2011, 12:00am PST
The authors study the problem of real-time error control in layered and replicated media systems. They formulate an optimization problem aimed at minimizing a cost metric defined over the wasted...
Provided by University of California
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White Papers
Transmission of Progressive Images Over Noisy Channels: An End-to-End Statistical Optimization Framework
February 24, 2008, 12:00am PST
The authors present a statistical optimization framework for solving the end-to-end problem of multiple antenna transmission of progressive images over noisy channels. Such channels exhibit...
Provided by University of California
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White Papers
A Study of Connectivity in MIMO Fading Ad-Hoc Networks
April 2, 2008, 12:00am PDT
The authors investigate the connectivity of fading wireless ad-hoc networks with a pair of novel connectivity metrics. Their first metric looks at the problem of connectivity relying on the outage...
Provided by University of California
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White Papers
Detecting MAC Layer Back-Off Timer Violations in Mobile Ad Hoc Networks
January 1, 2011, 12:00am PST
In IEEE 802.11 based ad hoc networks, by simply manipulating the back-off timers and/or wait times prior to transmission, malicious nodes can cause a drastically reduced allocation of bandwidth to...
Provided by University of California
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White Papers
Route Management in Semi-Infrastructured Wireless Networks
March 20, 2010, 12:00am PDT
Wireless network topologies have developed in a considerably different manner than the original vision of the ad-hoc network. Rather than a number of nodes with similar capabilities moving about...
Provided by University of California
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White Papers
SPARTA: Stable and Efficient Spectrum Access in Next Generation Dynamic Spectrum Networks
January 17, 2008, 12:00am PST
Future wireless infrastructure networks will dynamically access spectrum for maximum utilization. However, the fundamental challenge is how to provide stable spectrum access required for most...
Provided by University of California
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White Papers
Understanding the Power of Distributed Coordination for Dynamic Spectrum Management
June 19, 2008, 12:00am PDT
This paper investigates a distributed and adaptive approach to manage spectrum usage in dynamic spectrum access networks. While previous works focus on centralized provisioning, the authors...
Provided by University of California
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White Papers
Traffic-Aware Dynamic Spectrum Access
October 22, 2008, 12:00am PDT
Demand-driven spectrum allocation can drastically improve performance for Wi-Fi access points struggling under increasing user demands. While their frequency agility makes cognitive radios ideal...
Provided by University of California
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White Papers
Preamble Design for Non-Contiguous Spectrum Usage in Cognitive Radio Networks
March 26, 2009, 12:00am PDT
Cognitive radios can significantly improve spectrum efficiency by using locally available spectrum. The efficiency, however, depends heavily on their transceiver design. In particular, being able...
Provided by University of California
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White Papers
Minimum-Energy Multicast Tree in Cognitive Radio Networks
September 1, 2009, 12:00am PDT
The authors address the multicast problem in cognitive radio networks, where secondary users exploit channels temporarily unused by primary users (i.e., spectrum opportunities). The existence of a...
Provided by University of California
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