The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
La demande d'appels augmente soudainement et considérablement à la suite d'une catastrophe majeure, car les gens veulent vérifier si leurs familles et amis se trouvent dans la zone sinistrée. De nombreuses tentatives d'appel dans les systèmes cellulaires mobiles sont bloquées en raison des ressources limitées en fréquences radio. Dans cet article, comme solution à ce problème, la limitation du temps d'attente des appels est étudiée et une méthode de limite de temps d'attente dynamique (DHTL), qui fait varier la limite de temps d'attente de manière dynamique en fonction du nombre de tentatives d'appel, est proposée. L'effet de la limitation du temps d'attente est d'abord étudié à l'aide d'une simulation informatique avec un modèle de charge de trafic constante et élevée. Cette simulation montre que le temps de garde moyen des appels diminue à mesure que la limite de temps de garde est réduite. Mais cela montre également que limiter le temps d'attente réduit considérablement le nombre d'appels bloqués et les terminaisons d'appel forcées lors du transfert. Ensuite, une méthode d'estimation simple de la limite de temps de maintien, qui réduit le taux de blocage au taux normal pour une demande d'appel croissante, est décrite. Enfin, les résultats d'une simulation sont présentés, qui montrent que la méthode DHTL conserve de bonnes performances dans des conditions de fluctuation soudaine et importante de la charge de trafic.
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Kazunori OKADA, "Limiting the Holding Time in Mobile Cellular Systems during Heavy Call Demand Periods in the Aftermath of Disasters" in IEICE TRANSACTIONS on Fundamentals,
vol. E85-A, no. 7, pp. 1454-1462, July 2002, doi: .
Abstract: Call demand suddenly and greatly increases in the aftermath of a major disaster, because people want to check on their families and friends in the stricken area. Many call attempts in mobile cellular systems are blocked due to the limited radio frequency resources. In this paper, as a solution to this problem, limiting the holding time of calls is investigated and a dynamic holding time limit (DHTL) method, which varies the holding time limit dynamically based on the number of call attempts, is proposed. The effect of limiting the holding time is investigated first using a computer simulation with a constant and heavy traffic load model. This simulation shows that the average holding time of calls is decreased as the holding time limit is reduced. But it also shows limiting the holding time decreases the number of calls blocked and forced call terminations at handover considerably. Next, a simple estimation method for the holding time limit, which reduces the blocking rate to the normal rate for increasing call demand, is described. Finally, results are given of a simulation, which show that the DHTL method keeps good performance for a sudden and great traffic load fluctuation condition.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e85-a_7_1454/_p
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@ARTICLE{e85-a_7_1454,
author={Kazunori OKADA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Limiting the Holding Time in Mobile Cellular Systems during Heavy Call Demand Periods in the Aftermath of Disasters},
year={2002},
volume={E85-A},
number={7},
pages={1454-1462},
abstract={Call demand suddenly and greatly increases in the aftermath of a major disaster, because people want to check on their families and friends in the stricken area. Many call attempts in mobile cellular systems are blocked due to the limited radio frequency resources. In this paper, as a solution to this problem, limiting the holding time of calls is investigated and a dynamic holding time limit (DHTL) method, which varies the holding time limit dynamically based on the number of call attempts, is proposed. The effect of limiting the holding time is investigated first using a computer simulation with a constant and heavy traffic load model. This simulation shows that the average holding time of calls is decreased as the holding time limit is reduced. But it also shows limiting the holding time decreases the number of calls blocked and forced call terminations at handover considerably. Next, a simple estimation method for the holding time limit, which reduces the blocking rate to the normal rate for increasing call demand, is described. Finally, results are given of a simulation, which show that the DHTL method keeps good performance for a sudden and great traffic load fluctuation condition.},
keywords={},
doi={},
ISSN={},
month={July},}
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TY - JOUR
TI - Limiting the Holding Time in Mobile Cellular Systems during Heavy Call Demand Periods in the Aftermath of Disasters
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1454
EP - 1462
AU - Kazunori OKADA
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E85-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 2002
AB - Call demand suddenly and greatly increases in the aftermath of a major disaster, because people want to check on their families and friends in the stricken area. Many call attempts in mobile cellular systems are blocked due to the limited radio frequency resources. In this paper, as a solution to this problem, limiting the holding time of calls is investigated and a dynamic holding time limit (DHTL) method, which varies the holding time limit dynamically based on the number of call attempts, is proposed. The effect of limiting the holding time is investigated first using a computer simulation with a constant and heavy traffic load model. This simulation shows that the average holding time of calls is decreased as the holding time limit is reduced. But it also shows limiting the holding time decreases the number of calls blocked and forced call terminations at handover considerably. Next, a simple estimation method for the holding time limit, which reduces the blocking rate to the normal rate for increasing call demand, is described. Finally, results are given of a simulation, which show that the DHTL method keeps good performance for a sudden and great traffic load fluctuation condition.
ER -