ES2463216B2 - Conexiones de redes de datos en paquetes para dispositivos inalámbricos de prioridad múltiple - Google Patents

Conexiones de redes de datos en paquetes para dispositivos inalámbricos de prioridad múltiple Download PDF

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Publication number
ES2463216B2
ES2463216B2 ES201330676A ES201330676A ES2463216B2 ES 2463216 B2 ES2463216 B2 ES 2463216B2 ES 201330676 A ES201330676 A ES 201330676A ES 201330676 A ES201330676 A ES 201330676A ES 2463216 B2 ES2463216 B2 ES 2463216B2
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pdn
priority
pdn connection
nas signaling
network
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ES2463216R1 (es
ES2463216A2 (es
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Vivek Gupta
Puneet Jain
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Apple Inc
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Intel Corp
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    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
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Abstract

Se desvele un dispositivo y un procedimiento para formar una conexión de red de datos en paquetes (PDN) en un equipo de usuario (UE) configurado en modo de prioridad de acceso dual. El procedimiento comprende el envío, desde el UE a una entidad de gestión de movilidad (MME), de un mensaje de petición de conectividad PDN que incluye un indicador de sustitución de prioridad de señalización NAS para indicar que la conexión PDN tiene un modo diferente de prioridad de señalización NAS al de una conexión PDN existente. La conexión PDN existente está operativa en un primer modo de prioridad de señalización. La conexión PDN existente se desactive en el UE. En el UE se establece una nueva conexión PDN, que actúa en un segundo modo de prioridad de señalización NAS.

Description

DESCRIPCIÓN
Conexiones de redes de datos en paquetes para dispositivos inalámbricos de prioridad múltiple.
ANTECEDENTES
Las máquinas o dispositivos inalámbricos de tipo Máquina a Máquina (M2M) (referidos en lo sucesivo como dispositivos M2M) pueden comunicarse de forma principal o exclusiva con otros dispositivos M2M, con una intervención humana escasa o inexistente. Entre los ejemplos de dispositivos M2M pueden incluirse detectores inalámbricos, instrumentos de medida para llevar un seguimiento de los vehículos de una flota o para medir el uso de servicios como la electricidad o el gas, y así sucesivamente. En muchos casos, estos dispositivos M2M pueden conectarse con una red inalámbrica y comunicarse con un servidor de red por medio de una red inalámbrica de área extensa. Por ejemplo, los dispositivos M2M pueden usarse con la norma 802.16 del Institute of Electronics and Electrical Engineers (IEEE), IEEE Std. 802.162009, publicada el 29 de mayo de 2009 (WiMAX), así como en redes de Proyecto de Asociación de Tercera Generación (3GPP). En el lenguaje de 3GPP Evolución a Largo Plazo (“LTE”) versión 10 (marzo de 2011) (la “Norma LTE”), las comunicaciones M2M pueden referirse alternativamente como “comunicaciones de tipo máquina (MTC)”.
Desde una perspectiva de red, las comunicaciones M2M pueden considerarse comunicaciones de prioridad relativamente baja debido a la tolerancia de dispositivos M2M para transferencias de datos infrecuentes y latencia relativamente alta. Por ejemplo, los detectores de servicios públicos pueden enviar un informe, que comprende algunos bits, a una frecuencia de una vez al día. La ventana de tiempo de suministro del informe puede considerarse aceptable dentro de un periodo de varios minutos a varias horas. La alta latencia y la comunicación infrecuente permiten que operadoras de red proporcionen acceso a dispositivos M2M a sus redes por un coste relativamente bajo en comparación con los usuarios de anchura de banda superior y baja latencia típicas.
Sin embargo, muchos tipos de dispositivos M2M que normalmente se comunican con un nivel de baja prioridad pueden tener raras ocasiones en las que necesitan comunicarse con un nivel de prioridad que es superior a una prioridad baja.
BREVE DESCRIPCIÓN DE LOS DIBUJOS
Las características y ventajas de la invención serán evidentes a partir de la descripción detallada que se ofrece a continuación, tomada en conjunción con los dibujos adjuntos, que ilustran conjuntamente, a modo de ejemplo, las características de la invención; y, en los que:
La FIG. 1 ilustra un diagrama de bloques de una red inalámbrica de Proyecto de Asociación de Tercera Generación (3GPP);
la FIG. 2 ilustra un diagrama de bloques de un diagrama de flujo entre un equipo de usuario (UE) y un controlador de red de acuerdo con una forma de realización de la presente invención;
la FIG. 3a proporciona una tabla de ejemplo que ilustra un elemento de información (IE) de propiedades del dispositivo de acuerdo con una forma de realización de la presente invención;
la FIG. 3b proporciona una tabla de ejemplo que proporciona información adicional para el IE de propiedades del dispositivo de acuerdo con una forma de realización de la presente invención;
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En situaciones de congestión o sobrecarga, el operador puede restringir el acceso desde UE configurados para EAB a la vez que permite el acceso desde otros UE. Los UE configurados para EAB se consideran más tolerantes a las restricciones de acceso que otros UE. Cuando un operador determina que es apropiado aplicar EAB, la red difunde la información necesaria para proporcionar control de EAB para los UE de un tipo específico o situados en un área específica.
Sin embargo, en algunos casos, puede ser necesario sustituir la configuración de Prohibición de Acceso Extendido, normalmente en conjunción con una capacidad de sustitución de prioridad dual tal como se describe anteriormente. Normalmente, los UE que están configurados para prioridad de acceso baja también están configurados para EAB. En consecuencia, cuando se desea sustituir una prioridad baja para una comunicación iniciada por un UE, también puede ser conveniente sustituir una configuración EAB con el fin de permitirque prosiga la comunicación.
En la FIG. 2 se ilustra un diagrama de conexión de ejemplo entre el UE 150 y la red 100 (FIG. 1). Tal como ilustra el diagrama 200, el UE puede enviar un mensaje de petición de conectividad en una red de datos en paquetes (PDN) 204 a un controlador de red 206. En una forma de realización, el controlador de red puede ser una MME. Sin embargo, pueden configurarse también otros tipos de servidores para actuar como controlador de red, entre ellos S-GW, P-GW y PCRF.
El mensaje de petición de conectividad PDN 204 puede ser una petición de un UE 150 A o B para establecer una conexión PDN con una red de datos en paquetes para permitir que el UE 150 intercambie datos con una PDN, como internet. El controlador de red 206 puede controlar el establecimiento y/o el mantenimiento de conexiones PDN entre el UE 150 A o B y el EPC
160. El controlador de red 206 puede estar dispuesto en el EPC 160 con el que el UE 150 A o B intenta establecer una conexión PDN. Este aspecto se abordará más ampliamente en lospárrafos siguientes.
Si la RAN 110 o el EPC 160 están congestionados y no son capaces de soportar una nueva conexión PDN asociada con el mensaje de petición de conectividad PDN 204, el controlador de red 206 puede responder con un mensaje de rechazo de conectividad PDN 208 para rechazar el mensaje de petición de conectividad PDN 204. En este caso no puede establecerse una conexión PDN entre el UE 150 A o B y la RAN 110. En un ejemplo, a un mensaje de petición deconectividad PDN puede asociársele un mensaje de petición NAS, como, por ejemplo, un mensaje de petición de registro, un mensaje de petición de actualización de área de seguimiento o un mensaje de petición de servicio extendido.
En algunos casos, para tipos de dispositivos especiales, como dispositivos MTC, el controlador de red 206 puede proporcionar, en el mensaje de rechazo de conectividad PDN 208, un valor de tiempo de espera (WT). El valor WT se conoce también como tiempo de espera extendido. El valor WT puede medirse mediante un temporizador EWTA que está asociado con el dispositivo, que se conoce también como “temporizador de reducción de potencia”. El temporizador de reducción de potencia asociado con gestión de sesión (ESM) de sistema de paquetes evolucionado (EPS) se refiere según la especificación 3GPP LTE como temporizador T3396. El temporizador T3396 puede configurarse para iniciar la ejecución para la duración del tiempo de espera que es recibida del controlador de red. El temporizador T3396 puede mantener el dispositivo MTC “en espera”, por ejemplo, absteniéndose de enviar comunicaciones a la red, hasta que el tiempo de espera expire, momento en el cual se permiteal dispositivo MTC volver a enviar la petición a la red. Este aspecto se expondrá más ampliamente en los párrafos posteriores.
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desactivar los contextos de portador EPS existentes para la conexión PDN existente localmente sin notificación al UE y seguir con el procedimiento solicitado de conectividad PDN.
Aunque se han proporcionado varios ejemplos para una señalización NAS de prioridad dual, no pretenden ser limitativos. Es posible tener cualquier número de prioridades. Por ejemplo, losbits 1, 3 y 4 del IE de propiedades del dispositivo pueden usarse también para indicar una prioridad. En este ejemplo, pueden indicarse ocho niveles de prioridad diferentes en el IE de propiedades del dispositivo. Un número mayor de niveles de prioridad puede permitir que una carga de tráfico en una red inalámbrica sea gestionada más eficazmente al proporcionar un acceso rápido a los dispositivos con la máxima prioridad, y permitir que dispositivos con la prioridad mínima se comuniquen cuando exista una carga de tráfico relativamente baja. El mayor número de niveles de prioridad puede permitir también que los dispositivos de prioridadbaja usen la red a un coste relativamente bajo, ya que sólo se permitirá a los dispositivos usar la red durante periodos de bajo uso y tráfico bajo.
En otra forma de realización, puede comunicarse un mensaje de petición de conectividad PDN, del UE a la MME, con un APN diferente, para establecer la nueva conexión PDN con la MME. Esto permite al UE cambiar el modo de prioridad de señalización NAS estableciendo conexiones PDN con diferentes prioridades de señalización NAS usando diferentes APN. La capacidad de cambiar a una conexión PDN con una prioridad de señalización NAS diferenteque está usando un APN diferente puede usarse también para reducir la carga de señalización en la red y puede conseguirse en menos tiempo que el establecimiento de una nueva conexión PDN.
En ambos casos, la nueva conexión PDN puede tener un segundo modo de prioridad de señalización NAS que es mayor que el primer modo de prioridad de señalización NAS. Por ejemplo, el primer modo de prioridad de señalización NAS puede ser una prioridad baja, y elsegundo modo de prioridad de señalización NAS puede ser una prioridad normal. El modo de prioridad de señalización NAS incrementado puede permitir al UE comunicarse con una latencia menor que un PDN con un modo de prioridad de señalización NAS inferior cuando la red tiene una carga de tráfico mayor que un umbral seleccionado. La cantidad real de tráfico puede depender de las capacidades de la red.
Cuando se envía una petición de conectividad PDN para una PDN seleccionada a una red, y serealiza una determinación de que la PDN solicitada no puede ser aceptada por la red, la MME puede configurarse para enviar un mensaje de rechazo de conectividad PDN al UE. El mensaje puede incluir un valor de causa de ESM que indique el motivo del rechazo de la conectividad PDN solicitada. Por ejemplo, la Especificación Técnica (TS) 3GPP 24.301 V. 11.0.0 (2011-09) Sección 6.5.1.4 desvela una serie de diferentes códigos de causa de ESM que pueden ser enviados por un IE de causa de ESM en el mensaje de rechazo de conectividad PDN al UE. Si el valor de causa de ESM es #26 “recursos insuficientes”, la red puede incluir un valor para el temporizador T3396 para permitir que el UE reduzca la potencia de las peticiones adicionalesde conectividad PDN, tal como se ha expuesto anteriormente. El valor para el temporizador T3396 puede ser enviado en un IE de temporizador T3396.
Una primera petición de conectividad PDN puede ser enviada con un indicador de prioridad baja, con un mensaje de rechazo de conectividad PDN enviado desde la MME al UE con valor de causa #26 y un valor para el temporizador T3396. A continuación, un UE de prioridad dual puede enviar una segunda petición de conectividad PDN con un indicador de prioridad superior,como, por ejemplo, una prioridad normal. Si se envía un mensaje de rechazo de conectividad PDN para el segundo intento con el indicador de prioridad superior con valor de causa #26, entonces se recibirá un valor actualizado para el temporizador T3396. Si el mensaje de petición
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baja ajustado a un estado en el que la MS o el UE no están configurados para prioridad baja de señalización NAS; y enviar un mensaje de petición de modificación de recursos de portador para la conexión PDN con el indicador de prioridad baja ajustado a un estado en el que la MS o el UE no están configurados para prioridad baja de señalización NAS.
La MS o el UE pueden tener circuitos informáticos que están configurados además para determinar que existe una conexión PDN que está establecida con el indicador de prioridad baja ajustado a un estado en el que la MS o el UE no están configurados para prioridad baja de señalización NAS; y enviar un mensaje de petición de asignación de recursos de portador para la conexión PDN con el indicador de prioridad baja ajustado a un estado en el que la MS o el UE no están configurados para prioridad baja de señalización NAS.
La MS o el UE pueden tener circuitos informáticos que están configurados además para establecer múltiples conexiones PDN con diferentes prioridades de señalización NAS usando el APN específico.
La MS o el UE pueden incluir una antena, una pantalla de visualización táctil, un altavoz, un micrófono, un procesador gráfico, un procesador de aplicaciones, memoria interna o un puerto de memoria no volátil.
Varias técnicas, o determinados aspectos o partes de las mismas, pueden tomar la forma de código de programa (es decir, instrucciones) comprendido en medios tangibles, como disquetes flexibles, CD-ROM, discos duros, medios de almacenamiento legibles por el ordenador no temporales o cualquier otro medio de almacenamiento legible por la máquina en el que, cuando el código de programa es cargado y ejecutado por una máquina, como un ordenador, la máquina se convierte en un aparato que sirve para poner en práctica las diversas técnicas. En el caso de ejecución del código de programa en ordenadores programables, el dispositivo de cómputo puede incluir un procesador, un medio de almacenamiento legible por el procesador (que incluye memoria y/o elementos de almacenamiento volátiles y no volátiles), al menos un dispositivo de entrada y al menos un dispositivo de salida. La memoria y/o los elementos de almacenamiento volátiles y no volátiles pueden ser RAM, EPROM, unidad flash, unidad óptica, disco óptico magnético u otro medio para almacenar datos electrónicos. La estación de base y el dispositivo móvil pueden incluir también un módulo transceptor, un módulo contador, un módulo de procesamiento y/o un módulo de reloj o módulo temporizador. Uno o más programas que pueden implementar o usar las diversas técnicas descritas en la presente memoria descriptiva pueden usar una interfaz de programación de aplicaciones (API), controles reutilizables y similares. Dichos programas pueden implementarse en un lenguaje de programación procedimental de alto nivel u orientado a objetos para comunicarse con un sistema informático. Sin embargo, el o los programas pueden implementarse en ensamblador o lenguaje máquina, si se desea. En cualquier caso, el lenguaje puede ser un lenguaje compilado
o intérprete, y estar combinado con implementaciones de hardware.
Debe entenderse que muchas de las unidades funcionales descritas en esta memoria descriptiva se han denominado módulos, con el fin de realzar especialmente su independencia de implementación. Por ejemplo, un módulo puede implementarse como un circuito de hardware que comprende circuitos VLSI personalizados o matrices de puertas, semiconductores disponibles en el comercio como, por ejemplo, chips lógicos, transistores u otros componentes discretos. Un módulo puede implementarse también en dispositivos de hardware programables como matrices de puertas programables de campo, lógica de matricesprogramable, dispositivos lógicos programables o similares.
Los módulos también pueden implementarse en software para su ejecución por varios tipos de
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