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SIGMOBILE
 
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Contents

Abstracts from Volume 1, Number 2 of MC2R


GSM Network Signaling
(Tutorial Paper)

Yi-Bing Lin
liny@csie.nctu.edu.tw

Dept. Comp. Sci. & Info. Engr., National Chaio Tung University, Hsinchu, Taiwan

GSM is a wireless digital signaling network standard designed by standardization committees from the major European telecommunications operators and manufacturers. This article introduces the software platform for GSM network signaling protocol called Mobile Application Part (MAP). We describe the MAP services, the MAP protocol machine, the MAP dialog model, and then illustrate the MAP specific service primitives by an example.}


Wireless Media Access Control for Highly Mobile Information Servers: Simulation and Performance Evaluation

Kui W. Moka Alvin S. Limb
mok@cs.columbia.edu lim@cc.gatech.edu

aDepartment of Computer Science, Columbia University, New York, New York USA
bComputer Sciences Department, Clark Atlanta University, Atlanta, Georgia USA

Innovations of modern digital radio technology has enabled many large mobile and distributed information systems, such as inventory tracking systems, to provide readily accessible voice and data services to end users despite mobility of data servers. These systems often contain components that are equipped with radio frequency identification (RFID) tags and interrogators for wireless connectivity. However, there are usually large number of these tagged items in these systems that are highly mobile. The wireless connections among them are also prone to failure. In this paper, we evaluate and compare the performance of two RF tag data access protocols in a single channel per cell implementation: slotted ALOHA Time Division Multiple Access (ALOHA/TDMA) and Direct Sequence Code Division Multiple Access (DS/CDMA).

We use a discrete event simulation model to study the impact of these protocols on data service under a diversity of highly mobile operating conditions. Mobile conditions are captured separately by various levels of burst error, uplink and downlink disconnections, and tag population. The results show that performance of (DS/CDMA) dominates in all mobile conditions. In the most general cases, (DS/CDMA) outperforms (ALOHA/TDMA) by 1.5 times faster message time. (DS/CDMA) is particularly superior in the case of pure uplink disconnections. For burst error and pure downlink disconnections, (DS/CDMA) renders as much as 2.0 times and 4.5 times faster message time respectively.


A Fast Dynamic Channel Assignment Algorithm for Packet Services in DECT

Antonio Capone Luigi Musumeci
capone@elet.polimi.it musumeci@elet.polimi.it

Politecnico di Milano, Dipartimento di Elettronica e Informazione, Milano, Italy

In this paper we consider the use of DECT access for packet data services. DECT systems are characterized by a dynamic channel selection algorithm which allows to reuse the available radio resources in a flexible way. The standard channel allocation procedure results inefficient for packet data applications characterized by short and frequent messages, which determine fast varying traffic conditions. We propose an enhanced dynamic channel selection algorithm, which allows to fulfil the requirements of packet access in a more efficient way. The performance characteristics of the new and standard algorithm have been evaluated by simulation, and refer both to a scenario for only packet data services and an integrated scenario for voice and data services.

The ACM Special Interest Group on Mobility of Systems, Users, Data and Computing A Publication of SIGMOBILE A Publication of SIGMOBILE