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ES2564177T3 - Establecimiento de llamada de telecomunicación de medios mixtos - Google Patents

Establecimiento de llamada de telecomunicación de medios mixtos

Info

Publication number
ES2564177T3
ES2564177T3 ES08101341.9T ES08101341T ES2564177T3 ES 2564177 T3 ES2564177 T3 ES 2564177T3 ES 08101341 T ES08101341 T ES 08101341T ES 2564177 T3 ES2564177 T3 ES 2564177T3
Authority
ES
Spain
Prior art keywords
call
mobile station
mixed media
video
response
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
ES08101341.9T
Other languages
English (en)
Inventor
Michael David Stanmore Crook
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3G Licensing SA
Original Assignee
3G Licensing SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9902366&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ES2564177(T3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 3G Licensing SA filed Critical 3G Licensing SA
Application granted granted Critical
Publication of ES2564177T3 publication Critical patent/ES2564177T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

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    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • G—PHYSICS
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    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/022—Means for monitoring or calibrating
    • G01S1/026—Means for monitoring or calibrating of associated receivers
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    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
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    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/06—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
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    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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    • G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
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    • G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
    • G06F21/74—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information operating in dual or compartmented mode, i.e. at least one secure mode
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    • G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
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Abstract

Estación móvil apta para videotelefonía en respuesta a una interrupción de una llamada en curso de telecomunicaciones de medios mixtos, comprendiendo la estación móvil: - una interfaz de radiofrecuencia (23) configurada para comunicar por medio de una red de telecomunicaciones de radio; - un transmisor (30) configurado para transmitir datos que llevan por lo menos un primer y un segundo medios a una estación móvil remota durante una primera llamada de telecomunicaciones de medios mixtos; - un procesador (16) en comunicación con la interfaz de radiofrecuencia (23) configurado para recibir una indicación de que la transmisión de datos a la estación móvil remota en la primera llamada de telecomunicaciones de medios mixtos está siendo interrumpida; - estando el procesador (16) además configurado, en respuesta a la indicación, para iniciar una segunda llamada a la estación móvil remota, no soportando la segunda llamada los segundos medios.

Description

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DESCRIPCION
Establecimiento de llamada de telecomunicacion de medios mixtos.
Campo de la invencion
La presente invencion se refiere a tecnicas de establecimiento de llamada, interfaces de hardware y software interfaces y metodos para operar las mismas, para la transmision de datos de medios mixtos a traves de redes de telecomunicaciones. Mas particularmente, aunque no exclusivamente, la presente invencion se refiere a tecnicas para establecer llamadas que consisten en datos de voz y de video, a traves de redes de telecomunicaciones, y a una interfaz de hardware y software y metodo para operar la misma.
Antecedentes de la invencion
Son conocidos en la tecnica dispositivos, tales como videotelefonos, sistemas de conferencia de video y sistemas de transmision/comunicacion de datos de medios mixtos. Dependiendo de la aplicacion particular y de la calidad de servicio que sean necesarios, la transmision combinada de medios mixtos, por ejemplo, voz y video, puede requerir ancho de banda al lfmite de o superior a lo que esta actualmente disponible.
Las soluciones a este problema se han centrado en general en soluciones basadas en hardware. Se hace referencia al lector a la patente US n° 5.543.939 (a Harvey et al) y a la patente US n° 5.371.534 (a Dagdeviren et al) en este sentido.
Un problema con los enfoques basados en hardware es que la infraestructura de telecomunicacion existente a menudo necesita complementarse o modificarse ffsicamente, por ejemplo aumentando o sustituyendo la lfnea terrestre de cobre existente con fibra optica.
Aunque dichas soluciones pueden ser ffsicamente practicas, pueden ser economicamente prohibitivas.
La patente US n° 5.889.842 describe un sistema de comunicacion que tiene un primer terminal de comunicacion y un segundo terminal de comunicacion conectados a una red. La comunicacion puede realizarse mediante el primer y segundo terminales de comunicacion en una pluralidad de modos. El primer terminal de comunicacion tiene una unidad de deteccion para detectar llamadas que son rechazadas por el segundo terminal de comunicacion y que se realizan en un primer modo cuando se ha establecido un segundo modo. Basandose en la unidad de deteccion, una primera unidad llamante llama al segundo terminal de comunicacion en el segundo modo. Usando el segundo modo, cuando se acepta la llamada desde la primera unidad llamante, una unidad de instruccion de conmutacion de modo ordena al segundo terminal de comunicacion conmutar desde el segundo modo al primer modo. Basandose en una respuesta a una instruccion desde la unidad de instruccion de conmutacion de modo, una segunda unidad llamante llama al segundo terminal de comunicacion en el primer modo.
Por lo tanto, es deseable implementar una transmision de datos, particularmente audio/vfdeo, de medios mixtos que no requiera modificacion significativa de la propia infraestructura de comunicaciones.
La comunicacion audiovisual introduce cuestiones de privacidad y presentacion asf como la capacidad para comunicar senales visuales. Para conseguir la aceptacion generalizada, los servicios de videotelefono necesitaran tratar estas cuestiones incorporando controles y procedimientos particulares adaptados para tratar con comunicacion de vfdeo/audio.
Por consiguiente, un objetivo de la invencion es proporcionar un metodo y aparato para establecer y manejar llamadas de medios mixtos que permitan la transmision de datos de medios mixtos, preferentemente usando sustancialmente infraestructuras de red existentes, que sean relativamente sencillos de implementar. Es un objeto adicional de la invencion proporcionar una interfaz de videotelefono y un metodo para operar la misma que trate por lo menos alguna de las cuestiones de los factores humanos pertinentes a la comunicacion de video y de audio combinados.
Para los fines de describir las siguientes formas de realizacion preferidas de la invencion, se proporcionara la siguiente descripcion en el contexto del modelo del Grupo Especial Movil (GSM). Sin embargo, esto no debe interpretarse como una aplicacion limitante. Otras redes pueden ser apropiadas para la operacion segun la invencion.
Divulgacion de la invencion
Segun un primer aspecto de la presente invencion, se proporciona un terminal de comunicaciones que comprende: unos medios de transmisor adaptados para transmitir datos a un terminal de comunicacion remoto; y
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unos medios de procesador adaptados para, en respuesta a la recepcion de un activador, iniciar una llamada de voz a dicho terminal de comunicacion remoto,
caracterizado por que:
dicho terminal de comunicacion comprende un videotelefono; dicho terminal de comunicacion remoto comprende un videotelefono;
dichos medios de transmisor estan adaptados para transmitir datos de video a dicho videotelefono remoto durante una llamada de video establecida con dicho videotelefono remoto;
dicho activador se recibe durante dicha llamada de video establecida; y
dicho activador indica cambios en los datos a comunicar,
en el que dichos medios de procesador estan adaptados para iniciar dicha llamada de voz a dicho videotelefono remoto en respuesta a la recepcion de dicho activador durante dicha llamada de video establecida.
Segun un segundo aspecto de la presente invencion, se proporciona un metodo que incluye las etapas siguientes:
transmitir datos a un terminal de comunicacion remoto;
recibir un activador;
iniciar una llamada de voz a dicho terminal de comunicacion remoto, en respuesta a la recepcion de dicho activador,
caracterizado por que:
dicho terminal de comunicacion comprende un videotelefono; dicho terminal de comunicacion remoto comprende un videotelefono;
dicha etapa de transmision comprende transmitir datos de video a dicho videotelefono remoto durante una llamada de video establecida con dicho videotelefono remoto;
dicho activador se recibe durante dicha llamada de video establecida; y
dicho activador indica cambios en los datos a comunicar,
en el que dicha llamada de voz se inicia a dicho videotelefono remoto en respuesta a la recepcion de dicho activador durante dicha llamada de video establecida.
Segun unas formas de realizacion de la presente invencion se proporciona un videotelefono para transferir entre canales de comunicacion de diferente ancho de banda, que comprende:
unos medios de transmisor para establecer comunicaciones de datos con un videotelefono remoto en un primer canal que tiene un primer ancho de banda;
unos medios de procesador para recibir un activador durante dicha comunicacion establecida en dicho primer canal que indica cambios en los datos a comunicar, estando adaptados ademas los medios de procesador, en respuesta a dicha indicacion, para establecer comunicaciones de datos a dicho videotelefono remoto en un segundo canal, teniendo dicho segundo canal un segundo ancho de banda, en el que dicho primer ancho de banda es superior a dicho segundo ancho de banda.
Segun unas formas de realizacion de la presente invencion se proporciona un metodo para transferir entre canales de comunicacion de diferente ancho de banda, incluyendo el metodo las etapas siguientes:
establecer comunicaciones de datos con un videotelefono remoto en un primer canal que tiene un primer ancho de banda;
recibir un activador durante dicha comunicacion establecida en dicho primer canal que indica cambios en los datos a comunicar;
establecer comunicaciones de datos a dicho videotelefono remoto en un segundo canal, despues de que se
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interrumpen dichas comunicaciones de datos a dicho videotelefono remoto en el primer canal, teniendo dicho segundo canal un segundo ancho de banda, en el que dicho primer ancho de banda es superior a dicho segundo ancho de banda.
Breve descripcion de los dibujos
Seran evidentes caracterfsticas y ventajas de diversas formas de realizacion de la invencion a partir de la siguiente descripcion, proporcionada solo a tftulo de ejemplo, de formas de realizacion preferidas de la invencion, que hacen referencia a los dibujos adjuntos en los que:
la figura 1 ilustra el procedimiento de establecimiento de llamada segun una forma de realizacion de la presente invencion;
la figura 2 ilustra el flujo de llamada para pasar de modo de video a voz,
la figura 3 ilustra un diagrama de bloques simplificado de los elementos funcionales de la estacion movil aptos para su uso con la invencion;
la figura 4 ilustra un diagrama de flujo de un protocolo de negociacion para establecer llamadas de videotelefono;
la figura 5 ilustra una visualizacion de videotelefono de los llamantes durante una llamada de audio y antes del establecimiento de una llamada de videotelefono;
la figura 6 ilustra una visualizacion de videotelefono de los llamantes durante la fase de video de una llamada mientras se envfa un grafico estatico por defecto a una estacion movil de videotelefono receptora;
la figura 7 ilustra una visualizacion de videotelefono de los llamantes mientras se transmite y recibe video en directo a una estacion movil de videotelefono de los receptores;
la figura 8 ilustra una visualizacion de videotelefono de los llamantes mientras graban una imagen fija de un receptor durante una llamada de videotelefono;
la figura 9 ilustra una interfaz de pantalla de videotelefono cuando se graba una imagen de video capturada;
la figura 10 ilustra una interfaz de videotelefono de los receptores de ejemplo cuando se recibe una solicitud de consentimiento de llamada de videotelefono entrante; y
la figura 11 ilustra una pantalla de videotelefono de los llamantes mientras se congela su transmision de video en directo.
La figura 3 muestra un diagrama de bloques esquematico de los elementos funcionales principales que son comunes a las diversas formas de realizacion de un dispositivo de videotelefono adecuado para uso con la presente invencion. Los elementos funcionales individuales son conocidos cada uno individualmente y no se describiran en detalle. Un procesador principal 16 puede ser un microprocesador programable convencional, ejemplos de los cuales son bien conocidos en la tecnica, o una unidad de fin especial o configurada especialmente tal como un procesador de senales digitales. Una memoria de solo lectura (ROM) 17 esta conectada al procesador 16 y se usa para almacenar programas de control, datos e imagenes. La ROM 17 puede implementarse mediante cualquier tecnologfa apropiada, por ejemplo, usando una PROM flash. Una memoria de acceso aleatorio (RAM) 25 esta conectada al procesador 16 mediante el bus 24. Esta se usa como almacenamiento de funcionamiento y para el almacenamiento de datos e imagenes capturadas usando la camara de video (CCD) 11.
Las senales que corresponden a los datos capturados mediante la camara se pasan mediante una interfaz de camara 12 al procesador 16. La interfaz de camara 12 proporciona tambien el codec de video 18 con una representacion digital de los datos capturados desde la camara 11. Esta puede procesarse adecuadamente para visualizacion y/o transmision al sistema de comunicaciones movil. Una luz indicadora (no mostrada) puede conectarse al procesador 16 para informar la captura satisfactoria de datos y/o imagenes desde la camara 11 y puede usarse tambien durante la conferencia de video para indicar que el dispositivo opera correctamente.
La interfaz de camara 12 lleva a cabo todo el acondicionamiento de senal necesario al recibir imagenes desde la camara 11. El acondicionamiento de senal dependera de la configuracion precisa de la camara pero incluira preferentemente acondicionamiento de senal para posibilitar conversion de analogico a digital precisa con suficiente almacenamiento en memoria intermedia de los datos capturados. La camara 11 incluira toda la circuiterfa de soporte necesaria para producir que una camara completamente funcional entregue una senal de video formateada apropiadamente.
La camara 11 puede fijarse en una orientacion predeterminada en el dispositivo de comunicaciones movil (no
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mostrado). Como alternativa, la camara 11 puede proporcionarse con un mecanismo adecuado para permitir el ajuste de la orientacion de la camara para posibilitar al usuario apuntar la camara en diversas direcciones. Esta funcion puede estar asistida por alimentacion si se desea.
Un boton de encendido/apagado 13 esta conectado mediante una interfaz adecuada a un modulo de control de alimentacion 14. El modulo de control de alimentacion 14 responde a la operacion de este boton en un estado de alimentacion reducida para conectar una baterfa 15 al procesador 16. El modulo de control de alimentacion 14 puede controlar tambien la carga de la baterfa 15. El modulo de control de alimentacion 14 controlara tambien los requisitos de alimentacion cuando se conecta una fuente de alimentacion CA/CC convencional al videotelefono.
Una interfaz de visualizacion 19 conecta el visor 22 mediante el bus 24 al procesador 16. La interfaz de visualizacion 19 responde a instrucciones desde el procesador 16 para controlar el visor integrado 22 de una manera convencional.
El visor 22 esta provisto con una pantalla tactil 21. Una interfaz de pantalla tactil 20 acopla el visor tactil al procesador 16 mediante el bus 24. La pantalla tactil 21 es un mecanismo que es independiente del visor de video 22. Por ejemplo, puede colocarse una membrana de pantalla tactil transparente a traves del visor 22 y conectarse y calibrarse apropiadamente.
El procesador 16 puede disponerse para transmitir al visor 22 un menu de elementos seleccionables por el usuario, tales como iconos, botones, texto, etc., y es sensible a la localizacion en la que se toca la pantalla para introducir la seleccion del usuario de un elemento de menu particular. La pantalla tactil puede entonces usarse como una interfaz de usuario dinamica y reconfigurable, la funcion de la cual se describira en mas detalle a continuacion. La entrada de la pantalla tactil puede usarse en lugar de o ademas de la entrada de comando mediante un teclado externo o comando de voz (si la estacion movil esta equipada con hardware y software apropiados). Ademas, el area de la pantalla tactil o parte de la misma, puede configurarse como un area de trazado de fin general para permitir la entrada de datos y comandos escritos.
Una interfaz de audio 26 conecta los medios de receptor de audio, que consisten en uno o mas microfonos 27a y medios de transmisor de audio tales como uno o mas auriculares y/o altavoces 27b al procesador 16 y lleva a cabo todo el acondicionamiento de senal necesario segun se requiera para emitir y recibir senales de audio.
Una interfaz de radiofrecuencia (RF) 23 esta tambien conectada mediante el bus 24 para convertir cualquier dato a transmitir en senales para controlar un transmisor de RF 30, y convierte las senales desde un receptor de RF 31 en datos a pasarse mediante el bus a las interfaces pertinentes. El transmisor de RF 30 y el receptor de RF 31 estan conectados a una antena de radio 29. En consecuencia, esta interfaz de RF 23 posibilita comunicaciones inalambricas entre el videotelefono y el sistema de comunicaciones movil.
El procesador 16 esta programado por medio de programas de control y datos almacenados en la ROM 17 y en uso, la RAM 25, para recibir senales desde la camara 11 mediante la interfaz de camara 12, para interpretar estas senales y para deducir datos de las mismas que se visualizan en un visor 22 y que pueden almacenarse en la RAM 25 o cualquier otro dispositivo de memoria adecuado.
Se muestra un ejemplo de un visor de videotelefono que opera segun la invencion en las figuras 5 a 11. Se muestran diversas configuraciones de visualizacion que corresponden a diferentes estados de comunicacion de un dispositivo de videotelefono de los emisores.
Para establecer y manejar una llamada multimedia, la invencion proporciona el siguiente procedimiento, que se proporciona a modo de ejemplo. El servicio basico proporcionado virtualmente mediante todas las redes de telecomunicaciones, incluyendo GSM, es transmision del habla (telefonfa). GSM proporciona tambien otros servicios incluyendo comunicacion de datos a diversas velocidades, incluyendo una velocidad de llamada de voz de hasta 9600 bps y una velocidad de conexion de Datos de Conmutacion de Circuitos de Alta Velocidad (HSCSD) de hasta 56.000 bps. Los datos pueden enviarse a la ISDN, Redes de Datos Publicas de Conmutacion de Paquetes y Redes de Datos Publicas de Conmutacion de Circuitos usando una variedad de tecnicas de acceso y protocolos de comunicaciones. Otros servicios de datos incluyen el facsfmil Grupo 3 y el Servicio de Mensajes Cortos (SMS).
Los servicios complementarios aumentan aquellos anteriormente enumerados. Estos incluyen (bajo las especificaciones de la Fase 1 actual) diferentes tipos de reenvfo de llamada, retencion de llamada y restriccion de llamada para llamadas entrantes o salientes. Las especificaciones de la Fase 2 incluyen servicios complementarios tales como llamada en espera y conversaciones de multiples partes.
Una red GSM comprende un numero de entidades funcionales. La operacion de estas es conocida por el experto en la materia y por brevedad se hara referencia unicamente en terminos generales a continuacion. Para un analisis mas detallado, se hace referencia al lector a “The GSM System for Mobile Communications’’, Mouly y Pautet, Cel & Sys, 1992, y a las especificaciones tecnicas de GSM publicadas por el Instituto Europeo de Normas de Telecomunicaciones (ETSI).
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Ademas de los componentes analizados con referencia a la figura 3, un dispositivo o estacion movil (MS) de comunicaciones moviles de videotelefono incluye un terminal movil que contiene un Modulo de Identidad de Abonado (SIM). El SIM (tarjeta) proporciona una manera de identificar de manera unica un usuario que no esta restringido o ligado a un terminal movil de GSM particular. El equipo movil se identifica mediante un numero de Identidad de Equipo Movil Internacional (IMEI). El SIM incorpora un numero de Identidad de Abonado Movil Internacional (IMSI).
La estacion movil comunica con un Centro de Conmutacion Movil (MSC) mediante un Subsistema de Estacion Base (BSS). El MSC se comporta como un nodo de conmutacion convencional de una red PSTN o ISDN y proporciona funcionalidad de abonado movil incluyendo registro, autenticacion, actualizacion de localizacion, traspasos y encaminamiento de llamada. El MSC es el enlace entre la estacion movil (mediante la BSS) y las redes de cableado permanente. El Registro de Localizacion Domestico (HLR) y el Registro de Localizacion de Servicios (SLR) proporcionan funcionalidad de encaminamiento de llamada y de itinerancia. El HLR maneja la informacion administrativa relacionada con cada abonado junto con la localizacion ffsica actual de la estacion movil.
El nivel de enlace de radio de GSM usa una combinacion de Acceso Multiple por Division en el Tiempo (TDMA) y de Acceso Multiple por Division de Frecuencia (FDMA). La porcion del espectro de frecuencia asignada a GSM corresponde a porciones de 25 MHz del espectro, divididas en 124 frecuencias de portadora espaciadas en 200 KHz.
Se asigna una o mas frecuencias de portadora a cada estacion base y cada una de las frecuencias portadora se divide en tiempo usando TDMA. Las unidades de transmision de datos se denominan periodos de rafaga, agrupandose 8 periodos de rafaga en una trama de TDMA. Esta trama forma la unidad basica para la definicion de canales de GSM logicos.
Hay dos tipos de canales: canales especializados y canales comunes. Los canales especializados (tales como el canal de trafico: TCH) estan asignados a una estacion movil particular. Los canales comunes se usan mediante las estaciones moviles en modo en reposo.
Se usa un canal de trafico (TCH) para transmitir informacion del habla y de datos. Estos canales se definen usando una multi-trama de 26 tramas (es decir; un grupo de 26 tramas de TDMA). De las 26 tramas, 24 se usan para trafico, 1 se usa para lo que se conoce como el Canal de Control Asociado Lento (SACCH) y 1 no se usa. Los canales de trafico para el enlace ascendente y el enlace descendente estan separados por tres periodos de rafaga.
Los datos de senalizacion pueden transportarse en paralelo con transmision de datos de usuario. El canal de SACCH puede llevar aproximadamente 2 mensajes por segundo en cada direccion y muestra un retardo de transmision de aproximadamente 0,5 s. Este canal se usa para comunicar informacion de tara no urgente que esta generalmente relacionada con datos de rendimiento de recepcion usados para realizar decisiones de traspaso.
Los otros datos de tara se transmiten por medio del propio TCH. Estos datos incluyen mensajes relacionados con el progreso del establecimiento de llamada, informacion de autenticacion o senalizacion para iniciar un traspaso. Esto se denomina Senalizacion Asociada Rapida (FACCH). El receptor de la estacion movil y de la estacion base pueden distinguir entre estos datos transmitiendose ambos en el TCH por medio de una 'bandera de robo'. La transmision de datos de FACCH durante la transmision de trafico produce la perdida de datos de usuario (en localizaciones conocidas en el flujo de datos) cuyas perdidas en reflejo normalmente se experimentan como errores de transmision.
Los canales comunes se usan para intercambiar informacion de senalizacion. La informacion de senalizacion se usa para indicar a la estacion movil que se ha de conmutar en el modo especializado (es decir; comunicacion de datos) o para senalizar otros procedimientos administrativos.
Los tipos de trafico a los que se refiere principalmente la invencion son datos de voz (audio) y de video. Como con todas las otras comunicaciones que usan GSM, las senales de audio se codifican y transmiten digitalmente mediante la red de GSM como un flujo de datos digital.
Para la codificacion del habla, GSM usa un enfoque de Codificador Predictivo Lineal - Excitado por Pulso Regular (RPE-LPE) para digitalizar el habla antes de transmision. Esta tecnica se basa en la informacion de latencia de muestras anteriores para predecir la muestra actual. Los coeficientes de la combinacion lineal de las muestras anteriores, mas una forma codificada del residuo, la diferencia entre la muestra predicha y la real, se usan para representar la senal.
La entrada del habla sin procesar se divide en muestras de 20 ms, cada una de las cuales se codifica como 260 bits. Los datos del habla digitalizados codificados se endurecen frente a errores usando codificacion convolucional e intercalacion de bloques. El codec del habla produce un bloque de 260 de bits para cada 20 ms de muestra del habla. Ya que la respuesta de frecuencia del oido humano es variable a traves del espectro, no todos los datos del habla codificados son de igual significado en terminos de reproduccion del habla y comprension por el sistema
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auditivo humano. Por lo tanto, algunos bits de este bloque son mas importantes que otros en terminos de calidad y comprension del habla percibida. Por consiguiente, los bits se dividen en tres clases que reflejan su importancia para y efecto en la calidad y comprension de audio percibido resultante. Cada clase se procesa segun diferentes codigos de correccion de errores. Este procedimiento se analiza en mas detalle en la referencia anteriormente proporcionada y en otras partes en la bibliograffa.
Cada muestra se intercala para reducir el efecto de errores de rafaga. La senal digital se modula a continuacion en la portadora analogica usando Modulacion por Desplazamiento Mfnimo de filtro Gaussiano (GMSK).
El metodo anterior para codificar digitalmente los datos del habla puede ser especffico para informacion de voz o de audio. Los algoritmos usados para codificacion y modulacion de canal pueden ser diferentes para datos y para diferentes tasas de datos.
Para digitalizacion y codificacion de video, se usa preferentemente el siguiente procedimiento. Para una descripcion detallada, se hace referencia al lector al numero de patente GB 2 306 840 B (Universidad de Strathclyde) la divulgacion de la cual se incorpora en el presente documento por referencia.
La tecnica de transformacion de compresion de datos de video (SCT) implementa un codec de video particularmente adecuado para uso en un canal de tasa de bits ultra baja. La SCT implementa una representacion de secuencias de video mediante la aplicacion coordinada de cuantificacion de vector (VQ), compensacion de movimiento (MC) y (opcionalmente) codificacion residual (RE).
En resumen, el metodo es como sigue: se crea un libro de codigos extrayendo parches de referencia desde uno o mas fotogramas de imagen de biblioteca. Estos fotogramas de imagen de biblioteca contienen preferentemente caracterfsticas que es probable que esten contenidas en el fotograma de imagen a comprimir. Los grupos de pfxeles (32x32, 16x16 y 8x8) se conocen como parches de pfxeles. Un fotograma de imagen a comprimir se sub-divide en un conjunto de bloques de datos contiguos o parches de imagen a un primer nivel. La imagen se subdivide a continuacion unas dos veces mas, a diferentes niveles para proporcionar un conjunto de parches de pfxeles de diferente tamano. La subdivision es de tal manera que los parches solapan en sus bordes. Cada parche de imagen se le asigna un vector de posicion que puede ser adecuadamente el centro del parche.
Todos los parches se normalizan para brillo y contraste. Para cada parche de imagen normalizado, se buscan entradas con tamano en correspondencia en el libro de codigos para identificar la que se asemeja mas estrechamente al parche de imagen. El fndice del libro de codigos de cada uno de los parches de referencia coincididos se almacena junto con el vector de posicion y los factores de normalizacion de brillo/contraste para el parchen de imagen coincidido, como una codificacion comprimida. Se realiza algun tipo de gestion de error y se hace referencia al lector al numero de patente de RU GB 2 306 840 B para detalles adicionales. La tecnica de compresion implica la provision de algun fotograma de imagen de referencia arbitrario que puede tomarse como una primera aproximacion (pobre) al fotograma de imagen a comprimir. Se realiza un calculo de error comparando los errores entre el fotograma de referencia y el fotograma a comprimir. Este conjunto de errores se compara a continuacion con el conjunto de errores obtenido para los parches de referencia.
A partir de esta comparacion, se identifica el parche de referencia de libro de codigos que conduce a la mayor reduccion en errores. La codificacion comprimida correspondiente se almacena en una representacion de imagen comprimida. Tambien, la imagen de referencia se actualiza anadiendo el parche de referencia seleccionado a la misma.
Este proceso se repite recursivamente de modo que los parches de referencia se anaden continuamente al fotograma de imagen de referencia que conduce a una mejora gradual en la calidad del fotograma de referencia. En paralelo, las codificaciones comprimidas se anaden a la representacion comprimida. La recursividad se mantiene hasta que la calidad del fotograma de referencia alcanza algun umbral predeterminado. En el contexto de transmision de audio/vfdeo combinados, el primer fotograma capturado mediante el videotelefono de transmision se comprime como se ha descrito anteriormente usando alguna imagen de referencia arbitraria inicial que se almacena en memoria. Se obtiene un conjunto de codificaciones comprimidas como se ha senalado anteriormente y se almacena en memoria intermedia. Estos datos se transmiten a continuacion a la memoria intermedia del videotelefono de recepcion donde se decodifican y anaden a la imagen de referencia para visualizacion. Los datos se anaden tambien a la imagen de referencia almacenada en la memoria del videotelefono de transmision.
Mientras la estacion movil de transmision (en lo sucesivo denominada como un videotelefono) comprime el primer fotograma de imagen capturado, su camara captura un segundo fotograma de imagen. Despues de la transmision del primer conjunto de datos de parche, el proceso de compresion se repite pero esta vez busca parches que proporcionaran la mejor mejora en la 'nueva' imagen de referencia con relacion al segundo fotograma de imagen capturado. Las codificaciones comprimidas de estos parches se almacenan de nuevo en memoria intermedia antes de la transmision al videotelefono de recepcion. El proceso se repite para cada fotograma recien capturado de manera que el fotograma de imagen de referencia rastrea continuamente cambios en los fotogramas de imagen capturados.
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La forma de realizacion preferida de la presente invencion utiliza una variante de los protocolos controlados de flujo de bits H323, H324 y H340 conocidos para transmision de datos multimedia. La variante opera esencialmente segun las normas anteriormente indicadas. Las comunicaciones bajo, por ejemplo, la norma H323 corresponden a una mezcla de audio, video, datos y senales de control. Por lo tanto el protocolo es apto para operaciones asimetricas con respecto a diferentes algoritmos de codificacion y decodificacion para diferentes medios. Las normas anteriormente mencionadas incluyen funciones de control de llamada relacionadas con senalizacion, establecimiento de llamada, intercambio de capacidad y senalizacion de comandos e indicaciones, y mensajes para abrir y describir el contenido de canales logicos. Unas capas de control formatean los flujos de datos en mensajes que se emiten a la interfaz de red.
Haciendo referencia a la figura 1, se muestra un ejemplo de los procesos de control de flujo segun un proceso de consentimiento de comunicacion multimedia particular de la invencion. Las tecnicas descritas en el presente documento permiten tanto la notificacion o negociacion como el establecimiento de una llamada de voz/video combinados usando el servicio complementario que corresponde a Retencion de Llamada.
En la figura 1, las llamadas de voz corresponden a lineas unicas y las llamadas de video/audio (datos) a lineas dobles. Haciendo referencia a la figura 1, un llamante inicia una llamada de voz convencional (etapas a) a d) en la figura 1). Una vez establecida cualquier abonado puede elegir pasar a modo de video. Esto activara el proceso de consentimiento como se describe a continuacion. En la etapa e) el llamante conmuta a modo de video, que usa una conexion HSCSD. Esto se hace poniendo el videotelefono de los llamantes la llamada en espera e iniciando una segunda llamada (HSCSD) al mismo numero. La gestion de llamadas de red, usando el servicio complementario de Llamada en Espera, asegura que la llamada llega como una llamada en espera al destino correcto y se identifica como una llamada de datos (etapas f) y g)). El videotelefono de los receptores presenta al abonado con la opcion de pasar a modo de video o permanecer en modo de voz h). Si el receptor elige consentir a modo de video i), el videotelefono de los receptores pone la llamada de voz en espera y responde la llamada de datos. Los videotelefonos de los llamantes y receptores sincronizan a continuacion el flujo de datos como una llamada de video, liberan la llamada de voz y posibilitan el video localmente.
En este punto, puede transmitirse el video estatico o dinamico pre-grabado o como alternativa video en directo. El modo de video especffico dependera de la respuesta del llamante/receptor durante el proceso de negociacion de la llamada de video.
La figura 2 ilustra una trayectoria de flujo de llamada para pasar de modo de video a modo de voz. Las dos llamadas se identifican de la misma manera como anteriormente, mediante el uso de lineas unicas para la llamada de voz y lineas dobles para la llamada de video. Para llamadas iniciadas mediante el abonado llamado, la secuencia puede invertirse.
Si el llamante selecciona modo de voz, el videotelefono que llama libera la llamada de video y realiza una nueva llamada (de voz) al mismo numero que la llamada original. Esto tendra un retardo ya que la conexion de radio debe liberarse y volverse a establecer. Si el usuario que selecciona el modo de voz no inicio la llamada, el videotelefono debera informar tambien que tiene que cobrarsele al usuario por la llamada en curso, dandole la opcion de cancelar la solicitud antes de llevar a cabo estas acciones. El metodo anteriormente descrito puede modificarse ligeramente, dependiendo del tipo de red que se este usando. Sin embargo, dichas variaciones se consideran que caen dentro del alcance de la invencion.
Junto con el metodo de gestion de llamadas multimedia, descrito anteriormente, un aspecto importante de la presente invencion se refiere a la interaccion del usuario durante el proceso de comunicacion de audio/vfdeo. Las comunicaciones de audio se basan en un subconjunto relativamente limitado de atributos de comunicacion verbal que incluyen aspectos tales como tono, inflexion y contenido. Mejorar los servicios de telecomunicacion para incluir video introduce cuestiones complejas de interaccion de usuario y factores humanos. Por esta razon, una cuestion clave en relacion con los procedimientos de gestion de llamada de voz y de video combinados anteriormente descritos es el del control de usuario. Esto es importante en terminos de iniciar/negociar llamadas de video y de audio combinadas asf como el gestion de una llamada de videotelefono en curso.
Debe mencionarse que los metodos ilustrados en la figuras 1 y 2 pueden implementarse cada uno para transferir tanto desde voz a video como desde video a voz; como tal, los metodos se han de entender como formas de realizacion alternativas. En redes, en las que no es posible poner en espera llamadas de datos, se prefiere que se use el metodo de la figura 2 para transferir de video a voz.
La figura 4 muestra un diagrama de flujo simplificado que ilustra un protocolo de negociacion de llamada de video y audio combinados o metodo para operar una interfaz de videotelefono. El escenario ilustrado y descrito es el de un llamante que desea realizar una llamada de video/audio a un receptor. En la siguiente descripcion, el software de videotelefono al que se hace referencia es parte del sistema operativo Windows® CE de Microsoft®, conocido de otra manera como Rapier. El uso de esta interfaz no se considera que sea limitante ya que el metodo puede implementarse en diferentes plataformas usando una diversidad de sistemas operativos alternativos. Las
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visualizaciones de pantalla se proporcionan tambien a modo de ejemplo unicamente.
En la actualidad, una llamada de video puede realizarse unicamente cuando una unica llamada de audio esta en curso. Si una llamada de conferencia esta en curso o una llamada esta en retencion, la opcion de video no estara disponible. Esta limitacion puede depender del tipo de red y de los procedimientos de gestion de canal asociados.
Las figuras 5 a 11 muestran visualizaciones de pantalla de videotelefono en diferentes etapas de una llamada de video y audio combinados. Haciendo referencia a la figura 5, una vez que se elige la parte o receptor llamado deseado, la mayor parte de la entrada de comandos se realiza por medio de una tecla multifuncion 50. La funcion de esta tecla es sensible al contexto.
Haciendo referencia a la figura 4, un llamante activa una rutina de marcado 39 en su videotelefono. Esto establece una llamada de audio entre el llamante y receptor para una llamada de voz convencional. Desde el punto de vista de los llamantes, en este momento, el visor de estado 251 (vease la figura 5) muestra un temporizador de llamada y la pantalla esta subtitulada “Llamada de audio...”.
Para iniciar una llamada de video, el llamante presiona la tecla multifuncion 50 que, durante la comunicacion de audio (vease la figura 4), esta marcada “video”. Como se muestra en la figura 6, el subtftulo “Llamada de video” se visualiza a continuacion en la barra de tftulo del visor del dispositivo. La llamada de audio actual se pone en espera mientras se inicia una llamada de datos. La parte de llamada de video de la interfaz se lanza a continuacion. En este momento el area de visor de video del receptor 52 de la pantalla de los llamantes esta en blanco (vease la figura 5). Una vista en miniatura de la imagen que se observa mediante la camara de videotelefono de los llamantes se visualiza en la pantalla de imagen local de los llamantes 51. Esto permite al llamante previsualizar una imagen de video en directo de si mismos antes de que se envfe el video en directo.
Suponiendo que el receptor haya consentido una llamada de video y no se rechaza la solicitud de consentimiento de video, puede visualizarse un logo 600, u otro grafico estatico o dinamico prealmacenado (41 en la figura 4) en la estacion movil de los llamantes y/o de los recetores. Esto se muestra indirectamente en la figura 6 en la cual puede transmitirse una imagen fija por defecto al videotelefono de los receptores. Durante este tiempo el llamante puede aun ver la imagen en miniatura equivalente 51 generada mediante su propio videotelefono. Esto continua hasta que la parte de receptor consiente la transmision de video en directo. El grafico o imagen por defecto particular enviado mediante el llamante puede seleccionarse para una pluralidad de ficheros almacenados y establecerse por medio de un menu de preferencias de video. Este grafico por defecto se envfa al videotelefono del receptor y permanecera allf hasta que el llamante consienta la transmision de video en directo. Durante este tiempo, el cuadro de envfo 53 en el videotelefono del llamante presenta la cadena de texto “Fijo por defecto” (vease la figura 6).
Desde el punto de vista de los receptores, cuando la parte llamante inicia o solicita una llamada de video durante una llamada de audio, se visualiza un cuadro de dialogo (vease la figura 10) en la pantalla del dispositivo receptor. Pueden usarse tambien senales audibles o visuales tales como parpadeo de retroiluminacion o un tono de advertencia para notificar a un receptor que un llamante ha solicitado video. Una vez que se ha notificado al receptor de la solicitud de llamada de videotelefono entrante, el o ella tienen un numero de opciones. Con referencia a la figura 4, el receptor puede aceptar la llamada de video mutua 42, o denegar la conexion completamente 43 caso en el que la llamada se termina 401. En una forma de realizacion preferida, tocar “rechazar” 94 rechaza la llamada de video y vuelve a la pantalla de llamada de audio. Un cuadro de dialogo se visualizara brevemente en el videotelefono de los llamantes que indica que la solicitud de video se ha denegado.
Suponiendo que se acepta la llamada de video, por ejemplo, tocando el receptor la tecla multifuncion 93 “Aceptar”, se visualiza una imagen generada o activada por el receptor en el telefono de los llamantes. Esto puede ser una instantanea fija o un logo 600 (vease la figura 6) que el receptor ha elegido visualizar hasta que el o ella consienten transmitir video en directo. Como alternativa, el receptor puede aceptar inmediatamente la llamada de video y empezar a transmitir video en directo como se muestra en la figura 7. En este caso, el cuadro de envfo de los receptores (no mostrado) presenta la cadena de texto “Video en directo” y el visor de los llamantes muestra una imagen en directo de la parte llamada 52. Durante este tiempo es posible que la imagen recibida por el receptor sea aun una imagen estatica por defecto 51 enviada desde el llamante. El video en directo desde el llamante se visualizara unicamente de manera similar cuando este se active por la parte llamante. La figura 7 muestra la situacion, en la que el llamante ha permitido la transmision del video en directo. En este momento, la tecla multifuncion 50 presenta el texto “Congelar”. Tocar la tecla multifuncion “Congelar” detiene la transmision de video.
El receptor puede aceptar la llamada de video bajo un numero de diferentes circunstancias. Al consentir video, puede transmitirse una imagen estatica o dinamica de vuelta al llamante (45 en la figura 4). Como alternativa, puede transmitirse un mensaje o senal de consentimiento de vuelta a la estacion movil de los llamantes. Esto puede usarse para activar temporalmente la visualizacion de un grafico residente localmente en la estacion movil de los llamantes mientras se establece la llamada de video.
Las opciones que tiene tanto al receptor que consiente como al llamante reflejan las caracterfsticas variables de comunicacion persona a persona y posiblemente la naturaleza de la informacion que se va a comunicar. Los
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ejemplos proporcionados en la presente memoria pretenden ser ilustrativos y es posible que otras situaciones puedan requerir protocolos de consentimiento/aceptacion ligeramente diferentes que se consideran dentro del alcance de la invencion.
Por ejemplo, el receptor puede elegir pasar a video inmediatamente (48 en la figura 4) sin ningun retardo intermedio. Como alternativa, el receptor puede no desear transmitir una imagen en directo de si mismo. Esto puede ser por un numero de razones que incluye tal vez que el receptor no esta en una situacion conveniente o apropiada o tal vez simplemente no desea que el llamante le vea. La transmision de informacion visual puede proporcionar informacion de localizacion o senales que el receptor puede desear que permanezcan confidenciales. En este caso, el receptor puede elegir, como alternativa, transmitir o provocar visualizar en la estacion movil de los llamantes, tal vez un grafico estatico o dinamico que les represente a si mismos, su proveedor de servicio o cualquier otro grafico que pueda seleccionarse y transmitirse 47. Un elemento clave en este punto es que el receptor ha indicado una voluntad parcial de participar en alguna forma de interaccion de video, pero no intercambio de video en directo real. De nuevo, el grafico puede posiblemente estar residente en la estacion movil de los llamantes y activarse mediante una senal de mensajerfa enviada mediante el receptor. Una forma de realizacion de este tipo serfa menos exigente en terminos de ancho de banda, y el grafico podrfa adaptarse para adecuar el gusto, tipo de comunicacion asf como vincularse posiblemente a la identidad del llamante (identificado por medio del CLI).
Cuando un receptor de llamada de videotelefono no desee transmitir video en directo inmediato al llamante, puede introducirse un retardo (46 en la figura 4) al establecer el enlace de video o la transmision de datos de video en directo. El retardo puede pre-programarse o determinarse de otra manera mediante el usuario. Esta funcionalidad es un subconjunto de gestion de llamadas que tiene lugar durante la llamada de video en directo. Durante este periodo de retardo, la tecla multifuncion de los llamantes esta subtitulada “Directo” y se envfa una imagen por defecto al receptor. Tocar dicha tecla hace pasar de transmitir la imagen fija por defecto a transmitir video en directo desde el telefono de los llamantes.
Durante una llamada de video, el altavoz esta preferentemente siempre activo y se transmite audio entre los telefonos desde el momento que se establece la llamada de datos.
Un requisito adicional es la capacidad de revisar el estado de la transmision en cualquier momento durante la llamada de videotelefono. Esto se muestra en 49 en la figura 4 donde el receptor o el llamante pueden suspender la parte de video de la llamada, regresar a voz unicamente, introducir un retardo en transmision de video o terminar la llamada. Una situacion de este tipo puede vincularse a otro tipo de transmision de datos (por ejemplo, en forma de un fichero de datos o similar) a traves del canal de comunicacion junto con la conversacion. En un caso de este tipo, por razones de ancho de banda y de velocidad cualquier usuario puede suspender la trasmision de video y ejecutar transferencia de datos en el canal de comunicacion de baja tasa de bits. Como se muestra mediante la lfnea discontinua, una vez que se inicia audio/vfdeo, el protocolo puede ser simetrico en relacion con el llamante y receptor.
La transmision de video en directo se indica mediante el texto “Video en directo” en el cuadro de envfo 53 en la figura 7. En este contexto la tecla multifuncion 50 esta subtitulada “Congelar”. Tocar esta congela la imagen que se esta transmitiendo actualmente y la visualizacion es como se muestra en la figura 11. Esto permite que se cree una imagen fija de alta calidad en el videotelefono de los receptores y permite tambien que el llamante pare de enviar video en directo si se desea privacidad. El audio esta aun activo mientras el video esta congelado, a medida que se recibe el video desde la parte de receptor mediante el llamante. Durante una congelacion, se visualiza la cadena de texto “Fotograma congelado” en el cuadro de envfo 53 y se subtitula de nuevo la tecla multifuncion 50 “En directo”. Tocar la tecla multifuncion en este estado vuelve a transmitir video en directo.
La funcionalidad de negociacion de llamada de video es simetrica con respecto al llamante y al receptor ya que cualquier parte puede desear interrumpir la transmision de video en directo.
La interfaz y el hardware del videotelefono pueden incluir tambien funcionalidad que permita a un usuario grabar el video y/o audio entrante. Haciendo referencia a la figura 8, esta opcion esta disponible mediante un cuadro de dialogo 55 que se activa mediante teclas de software en el visor. La opcion 'tomar instantanea' esta en gris y no disponible mientras que la llamada de video se esta conectando. Deja de estar en gris tan pronto como una imagen, ya sea en directo, fija o congelada, se reciba desde la parte llamada. Seleccionar esta opcion almacena la imagen actualmente recibida desde la parte llamada y abre un cuadro de dialogo (vease la figura 9) que permite al usuario introducir un nombre de fichero 90 y tipo de fichero 91 para el fichero de imagen grabado. Una vez que se graba el fichero, se toca la tecla “ok” y el dispositivo regresa para presentar la pantalla del videotelefono. Se seguirfa un procedimiento similar cuando se graba video en directo.
Hay otras situaciones, en las que el procedimiento de negociacion de consentimiento de llamada puede variarse. Sin embargo, aquellas anteriormente mencionadas y descritas con referencia a la forma de realizacion preferida, representan las mas comunes. Un elemento clave es el alto grado de control que todas las partes tienen al negociar la llamada de videotelefono.
Esta forma de realizacion de la invencion usa un servicio complementario convencional (retencion de llamada). No se requieren cambios en la operacion de estos servicios en la red. Sin embargo, las alternativas incluyen que el MSC incluya funcionalidad para soportar la capacidad de modo de conmutacion. Una variacion adicional podrfa ser liberar siempre la primera llamada antes de establecer la segunda. Aunque la presente invencion se centra 5 principalmente en pasar de una llamada de voz a una llamada de voz/vfdeo, el metodo se usarfa siempre que se requiera cambiar de voz a datos.
Aunque la presente invencion se ha descrito a tftulo de ejemplo unicamente y haciendo referencia a las posibles formas de realizacion de la misma, se apreciara que pueden realizarse mejoras y/o modificaciones a la misma sin 10 apartarse, por ello, del alcance de la invencion como se expone en las reivindicaciones adjuntas.
Aunque la descripcion anterior se ha proporcionado en el contexto de procedimientos de gestion de llamadas de GSM, con modificacion adecuada, la invencion puede implementarse en otras redes, tales como redes de la tercera generacion.
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Aunque en la descripcion anterior se ha hecho referencia a integrantes o componentes que tienen equivalentes conocidos, y dichos equivalentes se incorporan a la presente memoria como si se expusieran individualmente.

Claims (11)

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    REIVINDICACIONES
    1. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos, comprendiendo la estacion movil:
    - una interfaz de radiofrecuencia (23) configurada para comunicar por medio de una red de telecomunicaciones de radio;
    - un transmisor (30) configurado para transmitir datos que llevan por lo menos un primer y un segundo medios a una estacion movil remota durante una primera llamada de telecomunicaciones de medios mixtos;
    - un procesador (16) en comunicacion con la interfaz de radiofrecuencia (23) configurado para recibir una
    indicacion de que la transmision de datos a la estacion movil remota en la primera llamada de
    telecomunicaciones de medios mixtos esta siendo interrumpida;
    - estando el procesador (16) ademas configurado, en respuesta a la indicacion, para iniciar una segunda llamada a la estacion movil remota, no soportando la segunda llamada los segundos medios.
  2. 2. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de
    telecomunicaciones de medios mixtos segun la reivindicacion 1, en la que la estacion movil esta configurada para
    iniciar la liberacion de la primera llamada de telecomunicaciones de medios mixtos en respuesta a la recepcion de la indicacion.
  3. 3. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 2, en la que la estacion movil esta configurada para iniciar la liberacion de la primera llamada de telecomunicaciones de medios mixtos antes del inicio de la segunda llamada a la estacion movil remota.
  4. 4. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 2, en la que la estacion movil esta configurada para iniciar la liberacion de la primera llamada de telecomunicaciones de medios mixtos tras el inicio de la segunda llamada a la estacion movil remota.
  5. 5. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 1, en la que la estacion movil esta configurada para poner en espera la primera llamada de telecomunicaciones de medios mixtos en respuesta a la recepcion de la indicacion.
  6. 6. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 1, en la que la primera llamada de telecomunicaciones de medios mixtos usa un canal de datos y la segunda llamada usa un canal de voz.
  7. 7. Estacion movil apta para videotelefonfa en respuesta a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 1, en la que el primer y segundo medios corresponden a unos medios de audio y de imagen de video, respectivamente.
  8. 8. Metodo para responder a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos mediante una estacion movil apta para videotelefonfa que tiene una interfaz de radiofrecuencia (23) a una red de telecomunicaciones de radiofrecuencia, comprendiendo el metodo:
    - transmitir, por medio de la red de telecomunicaciones de radiofrecuencia, unos datos que llevan por lo menos un primer y segundo medios a una estacion movil remota durante una primera llamada de telecomunicaciones de medios mixtos;
    - recibir una indicacion de que la transmision de datos a la estacion movil remota en la primera llamada de telecomunicaciones de medios mixtos esta siendo interrumpida; y
    - en respuesta a la indicacion, iniciar una segunda llamada a la estacion movil remota, no soportando la segunda llamada el segundo medio.
  9. 9. Metodo para responder a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 8, comprendiendo ademas el metodo:
    - iniciar la liberacion de la primera llamada de telecomunicaciones de medios mixtos en respuesta a la etapa de recepcion de la indicacion.
  10. 10. Metodo para responder a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos segun la reivindicacion 9, en el que el inicio de la liberacion de la primera llamada de telecomunicaciones de medios mixtos se realiza antes del inicio de la segunda llamada a la estacion movil remota.
    5 11. Metodo para responder a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos
    segun la reivindicacion 9, en el que el inicio de la liberacion de la primera llamada de telecomunicaciones de medios mixtos se realiza tras el inicio de la segunda llamada a la estacion movil remota.
  11. 12. Metodo para responder a una interrupcion de una llamada en curso de telecomunicaciones de medios mixtos 10 segun la reivindicacion 8, comprendiendo ademas el metodo la etapa de poner en espera la primera llamada de telecomunicaciones de medios mixtos en respuesta a la recepcion de la indicacion.
ES08101341.9T 2000-11-01 2001-10-16 Establecimiento de llamada de telecomunicación de medios mixtos Expired - Lifetime ES2564177T3 (es)

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GB0026700A GB2370188A (en) 2000-11-01 2000-11-01 Mixed-media telecommunication call set-up
GB0026700 2000-11-01

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EP1921855A3 (en) 2010-09-01
EP1334614A1 (en) 2003-08-13
US20040218035A1 (en) 2004-11-04
EP1921855B1 (en) 2015-12-09
US7995091B2 (en) 2011-08-09
WO2002037848A1 (en) 2002-05-10
GB2370188A (en) 2002-06-19
EP2334066A1 (en) 2011-06-15
EP2787724A1 (en) 2014-10-08
CN1801926A (zh) 2006-07-12
US7102663B2 (en) 2006-09-05
CN1473430A (zh) 2004-02-04
CN100466718C (zh) 2009-03-04
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US20060114315A1 (en) 2006-06-01
EP1921855A2 (en) 2008-05-14

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