ES2611935T3 - Mejoras del canal de acceso aleatorio para dispositivos LTE - Google Patents
Mejoras del canal de acceso aleatorio para dispositivos LTE Download PDFInfo
- Publication number
- ES2611935T3 ES2611935T3 ES13760373.4T ES13760373T ES2611935T3 ES 2611935 T3 ES2611935 T3 ES 2611935T3 ES 13760373 T ES13760373 T ES 13760373T ES 2611935 T3 ES2611935 T3 ES 2611935T3
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- packet aggregation
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- evolved node
- packets
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- 230000002776 aggregation Effects 0.000 claims abstract description 94
- 238000004220 aggregation Methods 0.000 claims abstract description 94
- 238000000034 method Methods 0.000 claims abstract description 44
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 25
- 230000007774 longterm Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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Abstract
Un equipo de usuario (110) para ser utilizado en una red LTE, comprendiendo dicho equipo de usuario (110): un transceptor de RF (120) para proporcionar una interfaz aérea LTE para comunicarse con una estación base que opera como Nodo B evolucionado (150); una circuitería de procesamiento (110) conectada al transceptor de RF (120) y configurada para, si el modo de agregación de paquetes background (de segundo plano) está activado y el dispositivo no tiene asignados actualmente recursos del enlace ascendente para la transmisión de peticiones de planificación al Nodo B evolucionado (150), iniciar un temporizador de agregación de paquetes, almacenar temporalmente los paquetes background que tienen un requisito de latencia laxo, y solicitar recursos del enlace ascendente del Nodo B evolucionado (150) a través de un procedimiento de acceso aleatorio para transmitir los paquetes almacenados temporalmente al expirar el temporizador de agregación de paquetes; caracterizado por que la circuitería de procesamiento (110) está configurada para, si el modo de agregación de paquetes background está habilitado, solicitar recursos del enlace ascendente del Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente antes de que expire el temporizador de agregación de paquetes si el número de paquetes background que han sido almacenados temporalmente excede un umbral especificado.
Description
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DESCRIPCION
Mejoras del canal de acceso aleatorio para dispositivos LTE Antecedentes
Los sistemas celulares LTE (Evolucion a Largo Plazo), tal como se expone en las especificaciones de la LTE del Proyecto de Asociacion de Tercera Generacion (3GPP), proporcionan cuatro clases de calidad de servicio (QoS) diferentes, denominadas clases de trafico. Son la clase conversacional, la clase de streaming (flujo continuo), la clase interactiva, y la clase background (de segundo plano). El principal factor de distincion entre estas clases de QoS es en que medida es sensible el trafico al retardo. La clase conversacional se dedica al trafico muy sensible al retardo, en tanto que la clase background es la clase de trafico mas insensible al retardo.
En los sistemas LTE, un terminal movil, denominado equipo de usuario (UE), adquiere inicialmente recursos del enlace ascendente (UL) desde la estacion base, denominada nodo B evolucionado (eNB), para la transmision de datos mediante la ejecucion de un procedimiento de acceso aleatorio (RA) utilizando el canal ffsico de acceso aleatorio (PRACH). El PRACH es un conjunto espedfico de recursos de tiempo-frecuencia asignados por el eNB para ser utilizados por los UE en la ejecucion del procedimiento de RA. Si la red no le asigna al UE recursos de peticion de planificacion (SR) periodica, el UE utiliza tambien el proceso de acceso aleatorio con el fin de adquirir recursos del enlace ascendente para todas las transmisiones de datos subsiguientes.
Los recursos PRACH son compartidos tanto entre los usuarios que se encuentran en modo conectado como entre los usuarios que estan en modo en espera. Como los mismos recursos PRACH son utilizados por multiples UE para el procedimiento de acceso aleatorio, se pueden producir colisiones. Lo deseable es que el PRACH opere con tasas de colision muy bajas, pero si aumenta el numero de usuarios aumentan la tasa de colisiones y la tasa de errores. El estandar LTE especifica un mecanismo de back-off (contencion) para la retransmision de preambulos para el usuario general con el fin de evitar mas colisiones, pero no existe ninguna solucion espedfica para los usuarios que estan utilizando trafico background. Como se ha indicado mas arriba, el trafico background es diferente en el sentido de que no tiene un requisito estricto de latencia y consiste en transmisiones de paquetes relativamente muy pequenas.
El documento US 2009/0225739 A1 proporciona un metodo de peticion de recursos basado en un temporizador en un sistema de telecomunicaciones moviles. El metodo de peticion de recursos incluye los pasos de permanecer en un modo de espera a que ocurra un evento mientras un temporizador de un terminal esta en marcha; transmitirle a una estacion base, cuando el temporizador expira al alcanzar un umbral de tiempo predeterminado, informacion de planificacion que incluye informacion sobre la cantidad de paquetes que se encuentran en una memoria de almacenamiento temporal del terminal; e inicializar el temporizador.
El documento WO 2009/116939 A2 se refiere a la prohibicion de peticiones de planificacion innecesarias para concesiones del enlace ascendente. Se pueden prohibir las peticiones de planificacion (SR) de transmision en el enlace ascendente para un flujo de datos, un grupo de canales logicos (por ejemplo, VoIP configurada con asignacion de recursos semipersistentes) u otras agrupaciones de prioridad mas baja, pero sin embargo se pueden conceder para el trafico de prioridad mas alta (por ejemplo, datos conectados a un portador radioelectrico de senalizacion (SRB)). Tambien se consigue una planificacion mas eficaz permitiendo que un planificador de transmision del enlace ascendente distinga entre flujos o grupos (por ejemplo, LCG) de distinta prioridad sin necesidad de un informe de estado de la memoria intermedia (BSR). Como resultado, cuando se planifica un recurso semipersistente para los datos de prioridad mas baja, existe menos retardo para los datos de alta prioridad, al tiempo que se elimina la senalizacion de control del enlace ascendente y del enlace descendente, esto es, hay menos peticiones de planificacion (SR) y concesiones del enlace ascendente para los datos de prioridad mas baja.
El documento US 2007/0070936 A1 esta relacionado con un dispositivo movil de comunicaciones que incluye un procesador configurado para establecer una conexion de red con un servidor en una red, y un generador de datos controlado por el procesador, configurado para generar periodicamente una unidad de datos a una tasa con un penodo fijo. El dispositivo movil de comunicaciones incluye tambien un transceptor configurado para transmitir, a traves de la conexion de red, la unidad de datos durante una de la pluralidad de ranuras, siendo cada una de las ranuras una fraccion del periodo fijo.
El documento US 2012/0057476 A1 esta relacionado con la comunicacion maquina a maquina (M2M). Los dispositivos determinan la intensidad de la senal del enlace ascendente para un dispositivo M2M utilizando una red inalambrica de acceso. Los uno o mas dispositivos identifican un modo de transmision por defecto del enlace ascendente que requiere que el dispositivo M2M emplee empaquetamiento de intervalos de tiempo de transmision (TTI) cuando la intensidad de la senal del enlace ascendente es inferior a un umbral determinado, e identifican un modo de transmision por defecto del enlace ascendente que requiere que el dispositivo M2M no emplee empaquetamiento TTI cuando la intensidad de la senal del enlace ascendente no esta por debajo del umbral particular. El uno o mas dispositivos almacenan en una memoria el modo de transmision por defecto para el dispositivo M2M. El uno o mas dispositivos recuperan de dicha memoria y durante una ventana de activacion asociada al dispositivo M2M, el modo de transmision por defecto para el dispositivo M2M y construyen, para el dispositivo M2M, una concesion de planificacion del enlace ascendente en funcion del modo de transmision por
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defecto almacenado.
Resumen
La invencion se define mediante la materia objeto de las reivindicaciones independientes. Los modos de realizacion ventajosos son objeto de las reivindicaciones dependientes.
Breve descripcion de los dibujos
La Fig. 1 ilustra un UE y un eNB de acuerdo con algunos modos de realizacion.
La Fig. 2 ilustra el procedimiento de acceso aleatorio de acuerdo con algunos modos de realizacion.
Las Fig. 3A-3B ilustran un algoritmo a modo de ejemplo para realizar la agregacion de paquetes background de acuerdo con algunos modos de realizacion.
Descripcion detallada
La siguiente descripcion y los dibujos ilustran suficientemente algunos modos de realizacion espedficos para permitir que aquellos experimentados en la tecnica los pongan en practica. Otros modos de realizacion pueden incorporar cambios estructurales, logicos, electricos, de proceso, y otros. Algunas partes y caractensticas de algunos modos de realizacion pueden incluirse en, o ser sustituidas por, las de otros modos de realizacion. Los modos de realizacion que se describen en las reivindicaciones comprenden todos los equivalentes disponibles de dichas reivindicaciones.
Como el trafico background consiste en paquetes pequenos con un requisito de latencia laxo, en la presente solicitud se divulga una tecnica para agregar paquetes de trafico background por parte de los usuarios de trafico background en lugar de ejecutar un procedimiento de RA para solicitar un recurso del UL para cada nuevo paquete. Un ejemplo de modo de realizacion de la tecnica es como sigue. La red o el eNB les informan a los UE con trafico background que utilicen un temporizador, denominado en la presente solicitud temporizador de agregacion de paquetes. Cuando el UE obtiene el valor para inicializar el temporizador de agregacion de paquetes, denominado valor de inicializacion del temporizador de agregacion de paquetes, se activa el temporizador. A continuacion, para los nuevos paquetes del UL que llegan debidos al trafico background el UE comienza a agregar o almacenar en memoria temporal todos los paquetes que llegan mientras se consume el tiempo del temporizador. Al expirar el temporizador, se solicitan mediante el procedimiento de RA los recursos del UL para transmitir todos los paquetes background almacenados temporalmente. El temporizador se reinicia entonces con el valor del temporizador de agregacion de paquetes para comenzar el proceso de nuevo. A continuacion se analizan otros modos de realizacion y variaciones de esta tecnica.
Sistema LTE de ejemplo
La Fig. 1 muestra un ejemplo de un UE 100 y un eNB 150. El UE 100 y el eNB 150 incorporan una circuitena de procesamiento 110 y 160, respectivamente, cada una de las cuales pretende representar cualquier tipo de configuracion de hardware/software capaz de realizar las funciones de procesamiento tal como se describen mas abajo. La circuitena de procesamiento 110 del UE 100 esta conectada a uno o una pluralidad o transceptores 120 de RF (radiofrecuencia), cada uno de los cuales esta conectado a una de una pluralidad de antenas 130. La circuitena de procesamiento 160 del eNB 150 esta conectada a una pluralidad de transceptores 170 de RF, cada uno de los cuales esta conectado a una de una pluralidad de antenas 180. El UE 100 puede ser, por ejemplo, un telefono movil u otro dispositivo informatico portatil. La Fig. 1 muestra una interfaz 111 de usuario, que podna ser, por ejemplo, un teclado o una pantalla tactil. La interfaz 111 de usuario le permite al usuario del dispositivo comunicarse con la circuitena de procesamiento 110, comunicacion que puede incluir establecer ciertos parametros, tal como se explica mas abajo. Tambien se muestra un indicador 112 de batena que le indica el estado de carga de la batena a la circuitena de procesamiento 110.
La capa ffsica de la LTE se basa en multiplexacion por division en frecuencias ortogonales (OFDM) para el enlace descendente y una tecnica asociada, multiplexacion por division de frecuencia en portadora unica (SC-FDM) para el enlace ascendente. De acuerdo con las especificaciones LTE del 3GPP, las transmisiones en el enlace descendente y el enlace ascendente se organizan en tramas de radio, cada una de las cuales tiene una duracion de 10 ms. Cada trama de radio esta constituida por 10 subtramas, y cada subtrama consta de dos ranuras consecutivas de 0,5 ms. Cada ranura comprende seis sfmbolos OFDM para un prefijo dclico extendido y siete sfmbolos OFDM para un prefijo dclico normal. Tanto en el enlace ascendente como en el enlace descendente, los datos se multiplexan en tiempo y en frecuencia mapeando los sfmbolos OFDM sobre una malla de recursos de tiempo/frecuencia que consiste en unidades elementales denominadas elementos de recursos (RE) que dentro de una trama de radio se identifican de forma unica mediante el puerto de antena, la posicion de la subportadora, y el mdice del sfmbolo OFDM. Un grupo de elementos de recursos correspondientes a doce subportadoras consecutivas dentro de una sola ranura recibe el nombre de bloque de recursos (RB).
Cuando un UE se encuentra en estado conectado, todos los recursos del enlace ascendente y del enlace descendente son asignados por el eNB. A nivel ffsico, los recursos son segregados en canales ffsicos
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independientes. Al UE se le asignan recursos en el canal ffsico de control del enlace ascendente (PUCCH) para solicitar recursos para la transmision de datos al eNB sobre el canal ffsico compartido del enlace ascendente (PUSCH). Si al UE no se le han asignado recursos en el PUCCH para transmitir dicha peticion planificacion, el UE puede utilizar un procedimiento de acceso aleatorio para la peticion de planificacion.
En un sistema LTE, se reservan recursos espedficos de tiempo-frecuencia para ser utilizados por los UE al ejecutar el procedimiento de acceso aleatorio, que reciben el nombre de canal ffsico de acceso aleatorio (PRACH). La localizacion del PRACH en la malla de tiempo-frecuencia se les difunde a los UE en un bloque de informacion del sistema (SIB). El acceso aleatorio puede ser utilizado por un UE con diversos propositos, que incluyen: el acceso inicial para establecer una conexion con un eNB, la transicion de un estado inactivo a un estado conectado, el establecimiento o restablecimiento de la sincronizacion con el eNB, incluyendo la recepcion de un parametro de avance temporal para compensar el tiempo requerido para que las transmisiones del enlace ascendente lleguen al eNB, y durante un proceso de traspaso a una nueva celda.
El procedimiento de acceso aleatorio comienza cuando el movil transmite un preambulo de acceso aleatorio en el canal ffsico de acceso aleatorio (PRACH). Con ello se inicia un intercambio de mensajes entre el movil y la estacion base, que puede ser no basado en contencion o basado en contencion. Como resultado del procedimiento, el movil recibe recursos para la transmision en el enlace ascendente, un valor inicial para el avance temporal del enlace ascendente y, si no tiene ya uno, un C-RNTI (identificador temporal de red radio espedfico de la celda) que identifica al UE y le permite al UE descodificar la informacion en el canal ffsico de control del enlace descendente (PDCCH) destinada a el. La Fig. 2 ilustra los pasos realizados al ejecutar el procedimiento de RA basado en contencion. En el paso A1, el UE transmite un preambulo de acceso aleatorio utilizando el PRACH. La transmision del preambulo le indica al eNB la presencia de un UE que esta ejecutando un procedimiento de acceso aleatorio, y tambien le permite al eNB estimar el retardo de transmision entre el UE y el eNB para ajustar la temporizacion del enlace ascendente. En el paso A2, el eNB le transmite al equipo de usuario la respuesta de acceso aleatorio que incluye un comando de avance temporal con el fin de permitirle ajustar la temporizacion de su transmision en el enlace ascendente en funcion de la estimacion de temporizacion obtenida en el paso A1, y tambien le asigna al terminal los recursos del enlace ascendente necesarios a utilizar en el siguiente paso. La transmision del paso A2 se realiza sobre un recurso del PDSCH identificado con una transmision del PDCCH reservada para las respuestas de acceso aleatorio. Si el eNB detecta una colision debido a que hay multiples UE intentando un acceso aleatorio, la respuesta de acceso aleatorio puede incluir tambien un comando de back-off que le indica a un UE que espere antes de intentar el acceso aleatorio de nuevo. En el paso A3, el UE le transmite al eNB un mensaje de identificacion utilizando un recurso del
PUSCH asignado al UE en el paso A2. El mensaje de identificacion tambien puede incluir una peticion de
planificacion. En el paso A4, el eNB le transmite al UE un mensaje de concesion utilizando el PDSCh, lo cual resuelve cualquier contienda ocasionada por multiples UE que estan ejecutando un procedimiento de acceso
aleatorio utilizando el mismo preambulo y que reciben la misma respuesta de acceso aleatorio del eNB. Si el
procedimiento de acceso aleatorio se ejecuta con exito, se le conceden al UE recursos del enlace ascendente. Un procedimiento de acceso aleatorio no basado en contencion implicana unicamente los pasos A1 y A2 utilizando un preambulo dedicado asignado al UE por el eNB.
Cuando un UE necesita transmitir trafico background, se puede transmitir una peticion de planificacion a traves del PUCCH con el fin de obtener recursos del PUSCH para transmitir el trafico background si al UE se le han asignado recursos del PUCCH, o dicho trafico se puede incluir con otros datos si al UE ya se le han asignado recursos del PUSCH. Si al UE no se le han asignado dichos recursos del enlace ascendente, se puede utilizar el procedimiento de acceso aleatorio. Como en el paso A1 del procedimiento de acceso aleatorio hay multiples UE que utilizan el mismo recurso del PRACH, tal como se ha descrito mas arriba, con diversos propositos, el uso reiterado del procedimiento de acceso aleatorio para transmitir paquetes background pequenos incrementa la probabilidad de colisiones entre los UE al intentar acceder al PRAcH. Ademas, ejecutar un procedimiento de acceso aleatorio multiple para transmitir cada uno de los paquetes background pequenos representa una carga para la fuente de alimentacion de la batena limitada de un UE. La tecnica de agregacion de paquetes background como se describe en la presente solicitud mejora ambos problemas.
En las Fig. 3A-3B se ilustra un ejemplo de un algoritmo que puede ser utilizado por un UE. El UE esta configurado para operar opcionalmente en un modo de agregacion de paquetes background en el que los paquetes background se almacenan temporalmente en lugar de ser transmitidos inmediatamente utilizando un procedimiento de acceso aleatorio para solicitar recursos del enlace ascendente. Cuando en el modo de agregacion de paquetes background se inhibe el acceso del UE al PRACH, si dicho acceso es para transmitir trafico background el Ue debe esperar a que expire el temporizador de agregacion de paquetes background, en cuyo momento los paquetes almacenados temporalmente pueden ser transmitidos utilizando un procedimiento de acceso aleatorio. En el paso B1, el UE comprueba si se ha recibido un valor de inicializacion del temporizador de agregacion de paquetes desde el eNB u otra entidad de red. Dicho valor de inicializacion recibido se utiliza en un comando desde el eNB para que el UE pase al modo de agregacion de paquetes. En otros modos de realizacion, el comando se puede transmitir como algun otro tipo de mensaje. En determinados modos de realizacion, el eNB puede difundir el valor del temporizador de agregacion de paquetes u otro comando mediante el bloque de informacion maestro (MIB) o mediante un bloque de informacion del sistema (SIB).
Si se ha recibido un valor de inicializacion, en el paso B2 el UE comprueba si el valor recibido es un comando
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procedente del eNB u otra entidad de red para salir del modo de agregacion de paquetes. Dicho comando puede tomar la forma de un valor de inicializacion especificado (por ejemplo, el valor cero) o un mensaje de instruccion expUcita. Si se ha recibido un comando de salida, el UE sale del modo de agregacion de paquetes y en el paso B3 detiene el temporizador de agregacion de paquetes antes de volver al paso B1. Si el valor de inicializacion recibido no es un comando de salida, en el paso B4 el UE almacena el valor. En paralelo con los pasos descritos mas arriba, en el paso B5 el UE comprueba tambien si se detecta alguna condicion para entrar de forma autonoma en el modo de agregacion de paquetes background. Semejantes condiciones pueden incluir, por ejemplo, un estado de batena baja o un nivel excesivo de trafico background. Si cualquiera de las vfas indica que el Ue va a entrar en el modo de agregacion de paquetes background, en el paso B6 el UE activa el temporizador de agregacion de paquetes en caso de que no estuviera ya en marcha y entra en el modo de agregacion de paquetes background. A continuacion, en el paso B7 el UE inicia (o continua) el almacenamiento de los paquetes background en la memoria de almacenamiento temporal de agregacion ejecutando un procedimiento de acceso aleatorio para su transmision. Dicho almacenamiento temporal continua hasta que el temporizador de agregacion de paquetes expira, tal como se determina en el paso B8, instante en el que, en el paso B9, se ejecuta un procedimiento de acceso aleatorio para transmitir los paquetes almacenados temporalmente. A continuacion, en el paso B10 el UE comprueba si se da alguna condicion de salida para salir del modo de agregacion de paquetes background. Semejantes condiciones pueden incluir, por ejemplo, un comando desde el eNB, un comando de usuario mediante una entrada del usuario, y/o la ausencia de condiciones para entrar de forma autonoma en el modo de agregacion de paquetes si dichas condiciones fueran las unicas responsables de que el UE iniciara el modo. Si se dan las condiciones de salida indicadas, en el paso B12 el UE sale del modo de agregacion de paquetes y vuelve a los pasos B1 y B5. En caso contrario, en el paso B11 el UE reinicia el temporizador de agregacion de paquetes con el valor de inicializacion almacenado y vuelve al paso B7.
En un ejemplo de modo de realizacion, un dispositivo actuando como un UE en una red LTE incluye: un transceptor de RF para proporcionar una interfaz aerea LTE para la comunicacion con una estacion base actuando como un Nodo B mejorado/evolucionado (eNB); y una circuitena de procesamiento conectada al transceptor de RF y configurada para, si al dispositivo no se le han asignado aun recursos del enlace ascendente para la transmision de peticiones de planificacion al eNB, iniciar un temporizador de agregacion de paquetes y transmitir los paquetes background que tienen un requisito de latencia laxo almacenando temporalmente los paquetes background hasta que expire el temporizador de agregacion de paquetes, en cuyo momento se le solicitan al eNB mediante un procedimiento de acceso aleatorio recursos del enlace ascendente para transmitir los paquetes background almacenados temporalmente. La circuitena de procesamiento se puede configurar para reiniciar, despues de la expiracion y mientras se encuentre en el modo de agregacion de paquetes, el temporizador de agregacion de paquetes con un valor de inicializacion del temporizador de agregacion de paquetes almacenado. El dispositivo se puede configurar para operar opcionalmente en modo de agregacion de paquetes background, en el que los paquetes background se almacenan temporalmente hasta que el temporizador de agregacion de paquetes expira, o para no operar en modo de agregacion de paquetes background.
La circuitena de procesamiento de este ejemplo de modo de realizacion puede estar configurada, ademas, para: recibir el valor de inicializacion del temporizador de agregacion de paquetes desde el eNB (u otra entidad de red) y almacenar el valor recibido; solicitarle al eNB un valor menor de inicializacion del temporizador de agregacion de paquetes si la tasa a la que se estan recibiendo los paquetes background para transmision excede un umbral especificado; entrar en modo de agregacion de paquetes background tras haber recibido del eNB un valor positivo de inicializacion del temporizador de agregacion de paquetes; salir del modo de agregacion de paquetes background tras haber recibido del eNB un comando apropiado, en donde el comando recibido del eNB para salir del modo de agregacion de paquetes puede ser un valor de inicializacion del temporizador de agregacion de paquetes especificado; entrar en el modo de agregacion de paquetes background tras haber recibido un comando de usuario mediante una entrada del usuario; solicitarle al eNB recursos del enlace ascendente para transmitir los paquetes background almacenados temporalmente antes de que expire el temporizador de agregacion de paquetes si el numero de paquetes background que se han almacenado temporalmente excede un umbral especificado; cuando esta operando en modo de agregacion de paquetes, reiniciar el temporizador de agregacion de paquetes si se recibe del eNB un nuevo valor de inicializacion del temporizador de agregacion de paquetes; recibir el valor de inicializacion del temporizador de agregacion de paquetes en un bloque de informacion maestro (MIB) o un bloque de informacion del sistema (SIB) enviado por el eNB; y/o entrar en el modo de agregacion de paquetes background si la tasa a la que se estan ejecutando procedimientos de acceso aleatorio para la transmision de trafico background excede un umbral especificado. El dispositivo del ejemplo de modo de realizacion tambien puede incluir un indicador de carga de la batena con la circuitena de procesamiento configurada para entrar en el modo de agregacion de paquetes background si el indicador de carga de la batena indica un nivel bajo de batena.
En un modo de realizacion, se puede vaciar la memoria de almacenamiento temporal para agregacion de paquetes background antes de que expire el temporizador de agregacion de paquetes background, incluso mientras se esta en el modo de agregacion de paquetes background, si se satisfacen ciertas condiciones. De acuerdo con un modo de realizacion de la invencion, el UE transmite los paquetes background almacenados temporalmente mediante un procedimiento de acceso aleatorio antes de que expire el temporizador de agregacion de paquetes si el numero de paquetes background que se han almacenado temporalmente excede un umbral especificado. En otro ejemplo, los paquetes almacenados temporalmente pueden ser transmitidos antes de que expire el temporizador de agregacion
de paquetes background mientras se esta en el modo de agregacion de paquetes background si los recursos del enlace ascendente se le han asignado al UE por alguna otra razon.
Los modos de realizacion descritos mas arriba se pueden implementar en varias configuraciones de hardware que pueden incluir un procesador para ejecutar instrucciones que ponen en practica las tecnicas descritas. Esas 5 instrucciones pueden estar contenidas en un medio de almacenamiento apropiado desde el que se transfieren a una memoria u otro medio ejecutable por un procesador.
Las antenas a las que se hace referencia en la presente solicitud pueden comprender una o mas antenas direccionales u omnidireccionales, incluyendo, por ejemplo, antenas dipolo, antenas monopolo, antenas de parche, antenas de cuadro, antenas de parche microstrip (microtira) u otros tipos de antenas apropiadas para la transmision 10 de senales de RF. En algunos modos de realizacion, en lugar de dos o mas antenas se puede utilizar una sola antena con multiples aberturas. En estos modos de realizacion, cada abertura se puede considerar como una antena separada. En algunos modos de realizacion de multiples entradas-multiples salidas (MIMO), las antenas se pueden separar de forma efectiva para aprovechar la diversidad espacial y las diferentes caractensticas de canal que pueden resultar entre cada una de las antenas y las antenas de una estacion transmisora. En algunos modos de 15 realizacion MIMO, las antenas pueden estar separadas por hasta 1/10 de una longitud de onda o mas.
La materia objeto se ha descrito conjuntamente con los modos de realizacion espedficos anteriores. Se debe tener en cuenta que estos modos de realizacion tambien se pueden combinar de cualquier forma que se considere ventajosa. Asimismo, para aquellos experimentados en la tecnica resultaran evidentes muchas alternativas, variaciones y modificaciones.
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Claims (14)
- 5101520253035404550REIVINDICACIONES1. Un equipo de usuario (110) para ser utilizado en una red LTE, comprendiendo dicho equipo de usuario (110):un transceptor de RF (120) para proporcionar una interfaz aerea LTE para comunicarse con una estacion base que opera como Nodo B evolucionado (150);una circuitena de procesamiento (110) conectada al transceptor de RF (120) y configurada para, si el modo de agregacion de paquetes background (de segundo plano) esta activado y el dispositivo no tiene asignados actualmente recursos del enlace ascendente para la transmision de peticiones de planificacion al Nodo B evolucionado (150), iniciar un temporizador de agregacion de paquetes, almacenar temporalmente los paquetes background que tienen un requisito de latencia laxo, y solicitar recursos del enlace ascendente del Nodo B evolucionado (150) a traves de un procedimiento de acceso aleatorio para transmitir los paquetes almacenados temporalmente al expirar el temporizador de agregacion de paquetes;caracterizado por quela circuitena de procesamiento (110) esta configurada para, si el modo de agregacion de paquetes background esta habilitado, solicitar recursos del enlace ascendente del Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente antes de que expire el temporizador de agregacion de paquetes si el numero de paquetes background que han sido almacenados temporalmente excede un umbral especificado.
- 2. El equipo de usuario (110) de la reivindicacion 1 en el que la circuitena de procesamiento (110) esta configurada para reiniciar el temporizador de agregacion de paquetes a un valor de inicializacion del temporizador de agregacion de paquetes almacenado, despues de expirar mientras permanece en el modo de agregacion de paquetes background.
- 3. El equipo de usuario (110) de la reivindicacion 2 en el que la circuitena de procesamiento (110) esta configurada para recibir el valor de inicializacion del temporizador de agregacion de paquetes desde el Nodo B evolucionado (150) y almacenar el valor recibido.
- 4. El equipo de usuario (110) de la reivindicacion 3 en el que la circuitena de procesamiento (110) esta configurada para solicitar un valor menor de inicializacion del temporizador de agregacion de paquetes desde el Nodo B evolucionado (150) si la tasa a la que se estan recibiendo los paquetes background para su transmision excede un umbral especificado.
- 5. El equipo de usuario (110) de la reivindicacion 3 en el que la circuitena de procesamiento (110) esta configurada para entrar en un modo de agregacion de paquetes background en el que los paquetes background se almacenan temporalmente tras haber recibido un valor positivo de inicializacion del temporizador de agregacion de paquetes desde el Nodo B evolucionado (150).
- 6. El equipo de usuario (110) de la reivindicacion 5 en el que la circuitena de procesamiento (110) esta configurada para salir del modo de agregacion de paquetes background tras haber recibido un comando apropiado desde el Nodo B evolucionado (150).
- 7. El equipo de usuario (110) de la reivindicacion 6 en el que el comando recibido desde el Nodo B evolucionado (150) para salir del modo de agregacion de paquetes background es un valor cero de inicializacion del temporizador de agregacion de paquetes.
- 8. El equipo de usuario (110) de la reivindicacion 1 que comprende, ademas: un indicador (112) de carga de batena; yen donde la circuitena de procesamiento (110) esta configurada para entrar en un modo de agregacion de paquetes background en el que los paquetes background se almacenan temporalmente si el indicador (112) de carga de la batena indica un estado de baja potencia.
- 9. El equipo de usuario (110) de la reivindicacion 1 en el que la circuitena de procesamiento (110) esta configurada para entrar en un modo de agregacion de paquetes background en el que los paquetes background se almacenan temporalmente al recibir un comando de usuario a traves de una entrada de usuario (111).
- 10. El equipo de usuario (110) de la reivindicacion 3 en el que la circuitena de procesamiento (110) es para reiniciar el temporizador de agregacion de paquetes si se recibe un nuevo valor de inicializacion del temporizador de agregacion de paquetes desde el Nodo B evolucionado (150).
- 11. El equipo de usuario (110) de la reivindicacion 3 en el que la circuitena de procesamiento (110) es para recibir el valor de inicializacion del temporizador de agregacion de paquetes en un bloque de informacion maestro enviado por el Nodo B evolucionado (150).510152025303540
- 12. El equipo de usuario (110) de la reivindicacion 3 en el que la circuitena de procesamiento (110) es para recibir el valor de inicializacion del temporizador de agregacion de paquetes en un bloque de informacion del sistema enviado por el Nodo B evolucionado (150).
- 13. Un metodo para operar un equipo de usuario (110) en una red de Evolucion a Largo Plazo LTE, que comprende los pasos de:si el modo de agregacion de paquetes background esta habilitado y el equipo de usuario (110) tiene asignados actualmente recursos del enlace ascendente por parte de un Nodo B evolucionado (150), transmitir los paquetes background que tienen un requisito de latencia laxo utilizando los recursos del enlace ascendente actualmente asignados;si el modo de agregacion de paquetes background esta habilitado y el equipo de usuario (110) no tiene asignados actualmente recursos para transmitirle peticiones de planificacion al Nodo B evolucionado (150), iniciar un temporizador de agregacion de paquetes, almacenar temporalmente los paquetes background que tienen un requisito de latencia laxo hasta que expire el temporizador de agregacion de paquetes, y al expirar el temporizador de agregacion de paquetes, solicitar recursos del enlace ascendente desde el Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente mediante un procedimiento de acceso aleatorio y transmitir los paquetes background almacenados temporalmente sobre los recursos del enlace ascendente asignados;caracterizado por quesi el modo de agregacion de paquetes background esta habilitado, solicitar recursos del enlace ascendente desde el Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente antes de que expire el temporizador de agregacion de paquetes si el numero de paquetes background almacenados temporalmente excede un umbral especificado.
- 14. Un medio legible por ordenador que almacena instrucciones que, al ser ejecutadas por la circuitena de procesamiento (110) de un equipo de usuario (100), hacen que el equipo de usuario (110) en una red de Evolucion a Largo Plazo LTE lleve a cabo los pasos de:si el modo de agregacion de paquetes background esta habilitado y el equipo de usuario (110) tiene asignados actualmente recursos del enlace ascendente por parte de un Nodo B evolucionado (150), transmitir los paquetes background que tienen un requisito de latencia laxo utilizando los recursos del enlace ascendente actualmente asignados;si el modo de agregacion de paquetes background esta habilitado y el equipo de usuario (110) no tiene asignados actualmente recursos para transmitirle peticiones de planificacion al Nodo B evolucionado (150), iniciar el temporizador de agregacion de paquetes, almacenar temporalmente los paquetes background que tienen un requisito de latencia laxo hasta que expire el temporizador de agregacion de paquetes, y al expirar el temporizador de agregacion de paquetes, solicitar recursos del enlace ascendente desde el Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente mediante un procedimiento de acceso aleatorio y transmitir los paquetes background almacenados temporalmente sobre los recursos del enlace ascendente asignados;caracterizado por quesi el modo de agregacion de paquetes background esta habilitado, solicitar recursos del enlace ascendente desde el Nodo B evolucionado (150) para transmitir los paquetes background almacenados temporalmente antes de que expire el temporizador de agregacion de paquetes si el numero de paquetes background almacenados temporalmente excede un umbral especificado
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- 2012-08-22 US US13/591,865 patent/US9655086B2/en active Active
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- 2012-08-31 US US13/600,675 patent/US20130242887A1/en not_active Abandoned
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