* Corresponding author, Email: [email protected] Abstract: Data broadcast based asymmetric communication is an appropriate model for many wireless and Internet applications. However, it is not energy efficient for wireless mobile equipments to use data broadcast if the receivers have to stay awake while waiting for a desired data item without knowing when it will appear on the air. For this...

Delay Tolerant Networks (DTNs) are a sub-class of mobile ad hoc networks (MANETs). They are mobile wireless networks that feature inherent connection disruption. In particular such networks are generally non-connected. In this paper we focus on defining a broadcast service which operate on DTNs. A number of protocols solving the problem of broadcasting across DTNs have been proposed in the past...

This paper presents a locality-based dissemination graph algorithm for scalable reliable broadcast. Our algorithm scales in terms of both network and memory usage. Processes only have “local knowledge” about each other. They organize themselves dynamically (right from the bootstrapping phase), according to join, leave or crash events, to form a locality-based dissemination graph. Broadcast mess...

We propose a membership and a reliable broadcast protocol that support several diierent semantics simultaneously and provide good overall performance. The broadcast protocol supports three atomicity semantics|weak, strong, and strict atomicity|and three ordering semantics| unordered, total order, and time order. These result in nine group communicationsemantics and an application can dynamicall...

”One seg” or one-segment digital terrestrial broadcasting service was launched in Japan in 2006. One current use of one-segment broadcasting is providing digital TV programs to mobile phones, portable devices, car navigation systems, and so on. Navigation systems generally provide drivers with point-of-interest information, traffic information, weather reports and so on through cellular phone n...

This paper describes the technical and system building advances in the automatic transcription of Mandarin broadcast speech made at IBM in the first year of the DARPA GALE program. In particular, we discuss the application of minimum phone error (MPE) discriminative training and a new topicadaptive language modeling technique. We present results on both the RT04 evaluation data and two larger c...

Digital television broadcast systems based on MPEG can compress video information from hundreds of megabits to less than 5 Mbps with very little user perceived picture quality degradation. This is the case as long as everything goes well. However, given the complexity of today’s digital television broadcast chain, problems can give rise to poor picture quality being delivered to the end user. T...

This work deals with some interesting issues that arose when the ITC-irst broadcast news transcription system was applied to transcribe the audio track of historical documentary films. Due to an evident acoustic and linguistic mismatch between the broadcast news and the new application domain, the initial word error rate was of 46.4%. By exploiting a limited amount of manually annotated trainin...

Code dissemination in wireless ad hoc network is an important aspect of network deployment. Once deployed, the network nodes may still need software updates to keep up with the changing application demand, thus making wireless broadcast an important aspect of any wireless network deployment. We present FBcast, a new broadcast protocol based on the principles of modern erasure codes. FBcast prov...

Mobile wireless ad-hoc networks lack some basic abilities taken for granted in wired networks, such as the ability to know adjacent nodes. We present a neighbor discovery protocol, with particular application to broadcast flooding. The Neighbor Exchange Protocol (NXP) has two main improvements over simple periodic broadcast schemes: (1) it only sends Hello packets when necessary to maintain top...