A dynamic call admission policy with precision QoS guarantee using stochastic control for mobile wireless networks

Wu, Si; Wong, K. Y. Michael; Li, Bo

doi:10.1109/90.993306

Cited by 118 publications

(1 citation statement)

References 19 publications

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“…Hasta ahora, se han realizado diferentes estudios sobre el efecto de la movilidad en esquemas de Control de Acceso (CAC) [99][100][101]. Dichos trabajos han obtenido expresiones a nivel del desempeño de llamadas con parámetros tales como la Probabilidad de Bloqueo de Nuevas Llamadas y la Probabilidad de Interrupción de Llamadas deTraspaso.…”

Section: Dependencia Entre El Tiempo De Retardo Y La Movilidad De Los...unclassified

Contribución al soporte de Calidad del Servicio en Redes Móviles

Padilla Aguilar

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En esta Tesis se plantea una solución para soportar Calidad de Servicio en Internet. Esta solución, denominada IntServ6, opera sobre redes fijas y móviles basadas en el protocolo IPv6. IntServ6 está fundamentada en la Arquitectura de Servicios Integrados y utiliza el campo de Etiqueta de Flujo de la cabecera IPv6 para identificar los flujos que tienen reservas de recursos en los Encaminadores. La utilización del campo Etiqueta de Flujo de IPv6 no ha sido estandarizada, existiendo hasta el momento sólo ciertas especificaciones de uso y algunas propuestas de su utilización que también fueron estudiadas. Tales propuestas sólo abarcan algunos aspectos de una posible solución pero no plantean soluciones completas. Estos aspectos son entre otros, el formato de interpretación de la Etiqueta de Flujo y algunas definiciones de arquitecturas de QoS descritas de forma muy general. Adicionalmente, IntServ6 posee extensiones para operar sobre redes móviles. Tales extensiones están diseñadas para operar con los protocolos de movilidad existentes de forma que no requieren la alteración de dichos protocolos. Aunque IntServ6 podría operar con el protocolo Mobile IPv6, es preferible su operación sobre HMIPv6 para reducir el tiempo de Traspaso.<br/><br/>Para la evaluación de IntServ6, se obtuvieron diferentes modelos matemáticos y de simulación que permitieron evaluar el rendimiento de la propuesta IntServ6 con respecto al estándar IntServ y, en algunos aspectos, se comparó también con MPLS. Todos los aspectos evaluados arrojaron que definitivamente IntServ6 es superior a IntServ. Así, IntServ6 mejora el rendimiento de los Encaminadores en aspectos como el Ancho de Banda de Memoria y la velocidad de procesamiento, también mejora el Tiempo Medio de Retardo de los paquetes, mejora el Tráfico Servido a cada flujo en Reservas Simples y en las Reservas en Túneles. Por otro lado, IntServ6 reduce considerablemente la dependencia del Retardo de los paquetes con respecto a al movilidad de los usuarios y además no afecta, e incluso reduce levemente el Tiempo de Latencia de Traspaso. This Thesis has obtained an approach to support Quality of Service on Internet. This approach, named IntServ6, operates over wired and wireless All IP Networks based on the IPv6 protocol. IntServ6 is based on the Integrated Services Architecture and it identifies traffic flows (with reservations at the routers), by means of the Flow Label Field allocated in the IPv6 Header. Currently, the use of the Flow Label Field is not standardized; thus, only there exist some general specifications about the use of this field and some proposals about it. However, such proposals only describe some aspects (Flow Label Field Format and general network architectures) but they not take into account many other issues that Internet requires today. In addition, IntServ6 has been designed with extensions to operate over Mobile Networks. Such extensions allow to IntServ6 to obtain a good performance with the current Mobility Protocols without make any modification to them. Although IntServ6 could operate with the Mobile IP protocol, is preferred that it operates with the Hierarchical Mobile IP protocol to reduce the Handoff Latency.<br/><br/>In order to evaluate IntServ6, several mathematical and simulation models were developed. Such models allowed evaluating the performance of IntServ6 and to compare it with the performance of the standard IntServ. In some cases, also IntServ6 was compared with MPLS. All evaluated issues show that IntServ6 is better than IntServ. Thus, IntServ6 improves the router performance in aspects as the Memory Bandwidth and the Processing Rate. IntServ6 reduces the mean packet delay; it also increases the Served Traffic for each flow in Simple Reservations and also in Reservations within Tunnels. On the other hand, IntServ6 reduces the packet delay dependence with the user mobility. Finally, IntServ6 also reduces the Handoff Latency.

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Section: Dependencia Entre El Tiempo De Retardo Y La Movilidad De Los...unclassified

Contribución al soporte de Calidad del Servicio en Redes Móviles

Padilla Aguilar

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Performance analysis of a cell‐based call admission control scheme for QoS support in multimedia wireless networks

Guizani

2010

Int J Communication

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SUMMARYNext generation wireless communication systems, including 3G and 4G technologies, are envisaged to support more mobile users and a variety of high-bandwidth multimedia services. Different multimedia services have diverse bandwidth and quality of service (QoS) requirements from their users that need to be guaranteed by wireless cellular systems. Furthermore, these systems will use micro/pico cellular architecture to provide a higher capacity. As a result of the smaller coverage area of this architecture, handoff events will occur at a much higher rate compared with the present macrocellular systems. In this paper, a multiple-threshold bandwidth reservation scheme combined with a call admission control algorithm is proposed and analyzed. The objective of our work is to achieve better QoS provisioning for mobile users while achieving efficient utilization of the available limited bandwidth. The proposed scheme is modeled as M/M/C/C queueing system and the performance measures, call blocking probability (CBP), and call dropping probability (CDP) are computed. The performance of our scheme is compared with the Complete Sharing (CS) policy. Simulation results show that our scheme surpasses the CS policy in terms of CBP, CDP, and bandwidth utilization.

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Service based CAC with QoS guarantee in mobile wireless cellular networks

Fry

Jamalipour

2005

Int. J. Commun. Syst.

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SUMMARYThe increasing variety and complexity of traffic in today's mobile wireless networks means that there are more restrictions placed on a network in order to guarantee the individual requirements of the different traffic types and users. Call admission control (CAC) plays a vital role in achieving this. In this paper, we propose a CAC scheme for multiple service systems where the predicted call usage of each service is used to make the admission decision. Our scheme enables real-time traffic to be transmitted using shared bandwidth without quality of service (QoS) requirements being exceeded. This ensures that the utilization of the available wireless bandwidth is maximized. Information about the channel usage of each service is used to estimate the capacity of the cell in terms of the number of users that can achieve a certain bit error rate (BER). Priorities assigned to each service are used to allocate the network capacity. An expression for the handoff dropping probability is derived, and the maximum acceptance rate for each service that results in the estimated dropping probability not exceeding its QoS requirements is calculated. Each call is then accepted with equal probability throughout the duration of a control period. Achieved QoS during the previous control period is used to update the new call acceptance rates thus ensuring the dropping probability remains below the specified threshold.Simulations conducted in a wideband CDMA environment with conversational, streaming, interactive and background sources show that the proposed CAC can successfully meet the hard restraint on the dropping probability and guarantee the required BER for multiple services.

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A dynamic call admission policy with precision QoS guarantee using stochastic control for mobile wireless networks

Cited by 118 publications

References 19 publications

Contribución al soporte de Calidad del Servicio en Redes Móviles

Contribución al soporte de Calidad del Servicio en Redes Móviles

Performance analysis of a cell‐based call admission control scheme for QoS support in multimedia wireless networks

Service based CAC with QoS guarantee in mobile wireless cellular networks

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