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Lucent Technologies


Latest Content From Lucent Technologies

Whitepaper: Design Tools for Transparent Optical Networks

by Lucent TechnologiesJan 01, 2008

Optical technology pledges to revolutionize data networking by providing massive bandwidth for data transport at minimal cost. A key to cost diminution is to increase transparency, that is, to keep a data stream encoded as an optical signal for as long as possible. This white paper elaborates Bell Labs-developed software gears that help design wavelength-switched optical networks. The software tools concurrently minimize the cost of the designed network, reduce the time and cost to perform the


Whitepaper: Query Translation From XPath to SQL in the Presence of Recursive DTDs

by Lucent TechnologiesJan 01, 2008

This paper has proposed a new approach to translating a practical class of xpath queries over (recursive) dtds to sql queries with a simple lfp operator found in many commercial rdbms. The novelty of the approach consists in a notion of regular xpath expressions capable of capturing dtd recursion and xpath recursion in a uniform framework; an efficient algorithm for translating an xpath query over a recursive dtd to an equivalent regular xpath expression; an efficient algorithm for rewriting a


Whitepaper: MPLS Network Tuning: Enabling Hitless Network Engineering

by Lucent TechnologiesJan 01, 2008

MPLS traffic engineering has primarily focused on efficient route setups. However, as data traffic explodes, there is an increased demand for tools that enable network-wide tuning in order to maintain high levels of end-to-end network efficiency. This paper published by Lucent Technologies describes that Multi-Protocol Label Switching (MPLS) traffic engineering has primarily focused on efficient route setups. However, as data traffic explodes, there is an increased demand for tools that enable


Whitepaper: Capacity of Differential Versus Non-Differential Unitary Space-Time Modulation for MIMO Channels

by Lucent TechnologiesJan 01, 2008

Considerable volume of work has followed the prediction that the use of multiple antennas in transmitting and receiving signals can result to substantial increases in information throughput. The underlying assumptions of this effort have been that the receiver knows the channel through some training scheme and that the channel coefficients are statistically independent. This paper published by Lucent Technologies describes Differential Unitary Space-Time Modulation (DUSTM) and its earlier


Whitepaper: Signaling-Free Optical Burst Switching

by Lucent TechnologiesJan 01, 2008

In WDM mesh networks, wavelengths on a link are exclusively assigned to demands with no sharing. This can lead to poor utilization because data traffic often tends to be bursty with long periods of low traffic rates. This paper published by Lucent Technologies describes that Optical Burst Switching (OBS) improves utilization, but is not well supported by today’s technologies. The paper presents a scheme that avoids signaling and cross-connect set-ups, dramatically reducing the delays and


Whitepaper: Rapid Mesh Restoration in GMPLS and a Performance Study

by Lucent TechnologiesJan 01, 2008

There is a trend towards making optical networks more easily manageable by adopting GMPLS, a suite of generalized IP-like control protocols. Included in this are protocols for shared (mesh) restoration. This paper published by Lucent Technologies describes trend towards making optical networks more easily manageable by adopting GMPLS, a suite of generalized IP-like control protocols. Included in this are protocols for shared (mesh) restoration. Unlike the traditional 1+1 protection scheme which


Whitepaper: Design and Implementation of a WLAN/CDMA2000 Internetworking Architecture

by Lucent TechnologiesJan 01, 2008

The Internet has emerged as an all-pervasive technology that continues to experience tremendous growth and popularity. The ever increasing dependence on this technology has sparked the interest to make it truly ubiquitous - available anywhere, any time. This paper published by Lucent Technologies explains the combination of 3G and WLAN wireless technologies offers the possibility of achieving anywhere, anytime Internet access, bringing benefits to both end-users and service providers. In this


Whitepaper: A Fully Abstract May Testing Semantics for Concurrent Objects

by Lucent TechnologiesJan 01, 2008

Abadi and Cardelli’s object calculus is a minimal language for investigating features of object languages such as encapsulated state, subtyping, and self variables. Gordon and Hankin added concurrent features to the object calculus, to produce the concurrent object calculus. This paper published by Lucent Technologies provides a fully abstract semantics for a variant of the concurrent object calculus. The paper defines testing for concurrent object components and then characterizes it using


Whitepaper: Fast Transfer of Channel State Information in Wireless Systems

by Lucent TechnologiesJan 01, 2008

In time-division duplex systems, where the basestation and mobiles share the same frequency band for transmission, the basestation can exploit reciprocity to obtain the forward channel from pilots received over the reverse channel. This paper published by Lucent Technologies describes the knowledge of accurate and timely Channel State Information (CSI) at the transmitter is becoming increasingly important in wireless communication systems. While it is often assumed that the receiver needs to


Whitepaper: Communication Over a Wireless Network With Random Connections

by Lucent TechnologiesJan 01, 2008

This paper published by Lucent Technologies analyzes a network of nodes in which pairs communicate over a shared wireless medium. Authors are interested in the maximum total aggregate traffic flow possible as given by the number of users multiplied by their data rate. The model differs substantially from the many existing approaches in that the channel connections in network are entirely random: they assume that, rather than being governed by geometry and a decay-versus-distance law, the