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".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Para implementar a transferência suave em sistemas de comunicação celular que empregam acesso múltiplo por divisão de código (CDMA), é necessário estabelecer linhas de comunicação entre o comutador e múltiplas estações base e distribuir os dados de comunicação através destas múltiplas conexões para as estações base simultaneamente. Isto significa que, quando o soft handoff é realizado com a mesma quantidade de recursos de linha de comunicação que o hard handoff, a probabilidade de bloqueio é maior do que para o hard handoff, e a qualidade do serviço é, portanto, pior. Além disso, os handoffs ocorrem com mais frequência à medida que o tamanho das células diminui, e isso aumenta a probabilidade de terminações forçadas. Os switches devem ser dotados de maior capacidade de processamento para acomodar os handoffs mais frequentes. Pode-se esperar que o uso do método de transferência de filas, em geral, mitigue a probabilidade de encerramento forçado em comparação com o método de transferência imediata. Nesse sentido, propomos um método de transferência de filas priorizadas que dá prioridade às estações móveis (MSs) de movimento rápido como forma de mitigar as terminações forçadas ainda mais do que o método de filas não prioritárias, sem aumentar sensivelmente a carga de processamento. Em seguida, comparamos as características de tráfego do nosso método proposto com as de três outros métodos em sistemas de microcélulas - método imediato, método de filas não prioritárias e método convencional de transferência direta sem múltiplas conexões - por simulação computacional. Aqui, considerando que o método proposto dá prioridade às chamadas de movimento rápido, as características de tráfego para estes métodos foram avaliadas separadamente para MSs de movimento lento e rápido. Os resultados revelam que o método proposto pode reduzir a probabilidade de terminação forçada e a probabilidade total de falha de chamada mais do que o método de fila não prioritária, sem ter um impacto apreciável nas chamadas lentas.
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Noriteru SHINAGAWA, Takehiko KOBAYASHI, Keisuke NAKANO, Masakazu SENGOKU, "Evaluation of Teletraffic in Cellular Communication Systems Using Multi-Connections for Soft Handoff" in IEICE TRANSACTIONS on Fundamentals,
vol. E83-A, no. 7, pp. 1318-1327, July 2000, doi: .
Abstract: To implement soft handoff in cellular communication systems that employ code division multiple access (CDMA), it is necessary to establish communication lines between the switch and multiple base stations and distribute the communication data via these multi-connections to the base stations simultaneously. This means that, when soft handoff is performed with the same amount of communication line resources as hard handoff, the blocking probability is higher than for hard handoff, and service quality is thus worse. Furthermore, handoffs occur more frequently as the size of cells becomes smaller, and this increases the probability of forced terminations. Switches must be endowed with greater processing capacity to accommodate the more frequent handoffs. The use of the queuing handoff method can be expected, in general, to mitigate forced termination probability compared with the immediate handoff method. In this regard, we propose a prioritized queuing handoff method that gives priority to fast-moving mobile stations (MSs) as a way to mitigate forced terminations even more than the non-priority queuing method without appreciably increasing the processing load. We then compare the traffic characteristics of our proposed method with these of three other methods in micro cell systems--immediate method, non-priority queuing method, and conventional hard handoff method without multi-connections--by computer simulation. Here, considering that the proposed method gives priority to fast-moving calls, traffic characteristics for these methods were evaluated separately for slow- and fast-moving MSs. The results reveal that proposed method can reduce the forced termination probability and total call failure probability more than non-priority queuing method without having an appreciable impact on slow-moving calls.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e83-a_7_1318/_p
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@ARTICLE{e83-a_7_1318,
author={Noriteru SHINAGAWA, Takehiko KOBAYASHI, Keisuke NAKANO, Masakazu SENGOKU, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Evaluation of Teletraffic in Cellular Communication Systems Using Multi-Connections for Soft Handoff},
year={2000},
volume={E83-A},
number={7},
pages={1318-1327},
abstract={To implement soft handoff in cellular communication systems that employ code division multiple access (CDMA), it is necessary to establish communication lines between the switch and multiple base stations and distribute the communication data via these multi-connections to the base stations simultaneously. This means that, when soft handoff is performed with the same amount of communication line resources as hard handoff, the blocking probability is higher than for hard handoff, and service quality is thus worse. Furthermore, handoffs occur more frequently as the size of cells becomes smaller, and this increases the probability of forced terminations. Switches must be endowed with greater processing capacity to accommodate the more frequent handoffs. The use of the queuing handoff method can be expected, in general, to mitigate forced termination probability compared with the immediate handoff method. In this regard, we propose a prioritized queuing handoff method that gives priority to fast-moving mobile stations (MSs) as a way to mitigate forced terminations even more than the non-priority queuing method without appreciably increasing the processing load. We then compare the traffic characteristics of our proposed method with these of three other methods in micro cell systems--immediate method, non-priority queuing method, and conventional hard handoff method without multi-connections--by computer simulation. Here, considering that the proposed method gives priority to fast-moving calls, traffic characteristics for these methods were evaluated separately for slow- and fast-moving MSs. The results reveal that proposed method can reduce the forced termination probability and total call failure probability more than non-priority queuing method without having an appreciable impact on slow-moving calls.},
keywords={},
doi={},
ISSN={},
month={July},}
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TY - JOUR
TI - Evaluation of Teletraffic in Cellular Communication Systems Using Multi-Connections for Soft Handoff
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1318
EP - 1327
AU - Noriteru SHINAGAWA
AU - Takehiko KOBAYASHI
AU - Keisuke NAKANO
AU - Masakazu SENGOKU
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E83-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 2000
AB - To implement soft handoff in cellular communication systems that employ code division multiple access (CDMA), it is necessary to establish communication lines between the switch and multiple base stations and distribute the communication data via these multi-connections to the base stations simultaneously. This means that, when soft handoff is performed with the same amount of communication line resources as hard handoff, the blocking probability is higher than for hard handoff, and service quality is thus worse. Furthermore, handoffs occur more frequently as the size of cells becomes smaller, and this increases the probability of forced terminations. Switches must be endowed with greater processing capacity to accommodate the more frequent handoffs. The use of the queuing handoff method can be expected, in general, to mitigate forced termination probability compared with the immediate handoff method. In this regard, we propose a prioritized queuing handoff method that gives priority to fast-moving mobile stations (MSs) as a way to mitigate forced terminations even more than the non-priority queuing method without appreciably increasing the processing load. We then compare the traffic characteristics of our proposed method with these of three other methods in micro cell systems--immediate method, non-priority queuing method, and conventional hard handoff method without multi-connections--by computer simulation. Here, considering that the proposed method gives priority to fast-moving calls, traffic characteristics for these methods were evaluated separately for slow- and fast-moving MSs. The results reveal that proposed method can reduce the forced termination probability and total call failure probability more than non-priority queuing method without having an appreciable impact on slow-moving calls.
ER -