MXPA03008878A

Power control for point-to-multipoint services provided in communication systems.

Abstract

To enable point-to-multipoint communication services in an existing cellular communication system infrastructure, each member subscriber station, i.e., a subscriber station participating in such a service, is receiving a forward link shared channel, and in certain embodiments additionally a forward link dedicated channel. Because transmission on the forward link channels from neighboring sectors presents interference to the transmission from the sector serving the subscriber station, it is desirable to control the forward link channel transmission power to the minimum acceptable power. Additionally, a transmission form each member subscriber station on a reverse link channel presents interference to other subscriber stations. Therefore, it is desirable to control the reverse link channel transmission to the minimum signal level. Consequently, a method and apparatus for a per control that enables point-to-multipoint services in an existing infrastructure of a wireless cellular telephone system is disclosed.

MXPA03008878A, drawing sheet 1 — Sheet 1 of 4

Term

Term ended

Expired 28 March 2022, 4.5 years ago.

16 claims: 6 independent, 10 dependent

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NOVEDAD DE LA INVENCIÓN Habiendo descrito la presente invención, se considera como novedad, y por lo tanto, se reclama como propiedad lo contenido en las siguientes:REIVINDICACIONES I.- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones, que comprende: determinar los 10 sectores cuya área de cobertura contienen estaciones de abonado activas que pertenecen a un grupo;y transmitir comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo desde los sectores determinados. 15
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- El método de conformidad con la reivindicación 1, caracterizado porque dichos comandos de control de energía de enlace inverso de transmisión sobre un canal compartido de enlace directo desde los sectores determinados comprende:20 la perforación de los comandos de control de energía de enlace inverso en el canal compartido de enlace directo.
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- El método de conformidad con la reivindicación 1, caracterizado porque dichos 25 comandos de control de energía de enlace inverso de transmisión sobre un canal compartido de enlace directo desde los sectores determinados comprenden:insertar los comandos de control de energía de enlace inverso en el canal compartido a 5 un enlace directo.
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- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones, que comprende:recibir a una estación de abonado que pertenece a un grupo con 10 canal compartido de enlace directo;ajustar en una estación de abonado activa que pertenece al grupo de energía de transmisión de enlace inverso de conformidad con los comandos de control de energía de enlace inverso contenidos en el canal 15 compartido de enlace directo.
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- El método de conformidad con la reivindicación 4, caracterizado porque comprende además:ignorar a una estación de abonado pasiva que pertenece al grupo los comandos de control de 20 energía de enlace inverso contenidos en el canal compartido de enlace directo.
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- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende:transmitir datos 25 de usuario sobre un canal compartido de enlace directo;y transmitir comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo.
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- El método de conformidad con la 5 reivindicación 6, caracterizado porque dichos comandos de control de energía de enlace inverso de transmisión sobre un canal dedicado de enlace directo comprende:perforar los comandos de control de energía de enlace inverso en el canal 10 dedicado de enlace directo.
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- El método de conformidad con la reivindicación 6, caracterizado porque dichos comandos de control de energía de enlace inverso de transmisión sobre un canal dedicado de enlace 15 directo comprende:insertar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo.
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9,- Un método para controlar la energía para los servicios múltiples de punto a punto en un 20 sistema de comunicaciones que comprende:recibir en una estación de abonado que pertenece a un grupo un canal compartido de enlace directo;recibir en la estación de abonado un canal dedicado de enlace directo y ajustarlo a una 25 estación de abonado activa que pertenece al grupo la energía de transmisión de enlace inverso de conformidad con los comandos de control de energía de enlace inverso contenidos en el canal dedicado de enlace inverso.
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- Un método para controlar la energía para los servicios múltiples de punto a punto en un sistema de comunicaciones que comprende:determinar sectores cuya área de cobertura contiene estaciones de abonado activas que pertenecen a un grupo;y transmitir comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo desde los sectores determinados.
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- El método de conformidad con la reivindicación 10, caracterizado porque dichos comandos de control de energía de enlace inverso de transmisión sobre un canal dedicado de enlace directo desde los sectores determinados comprende:perforar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo.
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- El método de conformidad con la reivindicación 10, caracterizado porque dichos comandos de control de energía de enlace inverso de transmisión sobre un canal dedicado de enlace directo desde los sectores determinados comprende:insertar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 5
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- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende:recibir en una estación de abonado que pertenece a un grupo un canal compartido de enlace directo;recibir en 10 cada estación de abonado activo que pertenece a un canal dedicado de enlace directo;y ajustarlos a la energía de transmisión de enlace inverso de la estación de abonado activa de conformidad con los comandos de control de energía de enlace inverso 15 contenidos en el canal dedicado del enlace directo.
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- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende:supervisar en un 20 sector al menos un canal de enlace inverso para detectar una calidad métrica de un canal compartido de enlace directo;y ajustar la energía de canal compartido de enlace directo de conformidad con la peor calidad métrica. 25 15.- El método de conformidad con la reivindicación 14, caracterizado porque dicho ajuste de canal compartido de enlace directo de conformidad con la peor calidad métrica comprende: disminuir la energía del canal compartido de enlace directo por una segunda cantidad si la calidad métrica de todos de al menos un canal de enlace inverso indica una disminución en la energía. 16 .- El método de conformidad con la reivindicación 14, caracterizado porque dicho ajuste de la energía del canal compartido de enlace directo de conformidad con la peor calidad métrica comprende: incrementar la energía del canal compartido de enlace directo en una segunda cantidad si la calidad métrica de al menos uno de al menos un canal de enlace indica un incremento en energía. 17 .- Un método para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: determinar en cada estación de abonado que pertenece a un grupo una calidad métrica de un canal compartido de enlace directo;y transmitir la calidad métrica determinada. ' 18 .- El método de conformidad con la reivindicación 17, caracterizado porque dicha transmisión de la calidad métrica determinada comprende: transmitir la calidad métrica determinada si la calidad métrica determinada es menor que el umbral. 19,- El método de conformidad con la reivindicación 18, caracterizado porque dicha transmisión de la calidad métrica determinada si la calidad métrica determinada es menor que el umbral comprende: transmitir la calidad métrica determinada si la calidad métrica determinada es menor que un umbral predeterminado. 20 .- El método de conformidad con la reivindicación 18, caracterizado porque comprende incrementar el umbral en una primera cantidad si una información enviada sobre el canal compartido de enlace directo se recibe con un decodificador métrico suficiente. 21,- El método de conformidad con la reivindicación 18, caracterizado porque comprende: disminuir el umbral en una segunda cantidad si una información enviada sobre el canal compartido de enlace directo se recibe con un decodificador de métrica insuficiente. 22 .- El método de conformidad con la reivindicación 17, caracterizado porque dicha transmisión de la calidad de métrica determinada comprende: transmitir la calidad métrica determinada sobre un canal dedicado de enlace 5 inverso, asignado a dicha estación de abonado. 23,- El método de conformidad con la reivindicación 17, caracterizado porque dicha transmisión de la calidad métrica determinada comprende: transmitir la calidad métrica 10 determinada sobre un canal común de enlace inverso, supervisado por la estación de abonado. 24 .- El método de conformidad con la reivindicación 23, caracterizado porque dicha transmisión de la calidad métrica determinada 15 comprende: la solicitud de una estación de abonado de una asignación de un canal dedicado de enlace inverso sobre el canal común de enlace inverso supervisado por la estación de abonado;y transmitir la calidad métrica determinada sobre el 20 canal dedicado de enlace inverso. 25 .- El método de conformidad con la reivindicación 24, caracterizado porque dicha solicitud por una estación de abonado de una asignación de un canal dedicado de enlace inverso 25 comprende: solicitar una estación de abonado una 74 asignación de un canal dedicado de enlace inverso sobre un canal de acceso. 26 .- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: medios para determinar sectores cuya área de cobertura contiene estaciones de abonado activas que pertenecen a un grupo;y medios para transmitir comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo desde los sectores determinados. 27 .- El aparato de conformidad con la reivindicación 26, caracterizado porque dichos medios para transmitir los comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo desde los sectores determinados comprende: medios para perforar los comandos de control de energía de enlace inverso en el canal compartido de enlace directo. 28 .- El aparato de conformidad con la reivindicación 26, caracterizado porque dichos medios para transmitir los comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo desde los sectores determinados comprende: medios para insertar los comandos de control de energía del enlace inverso en el canal compartido de enlace directo. 29 .- Un aparato para controlar la energía para servicios múltiples de punto a punto en un 5 sistema de comunicaciones que comprende: medios para recibir en una estación de abonado que pertenece a un grupo un canal compartido de enlace directo;medios para ajustar en una estación de abonado activa que pertenece al grupo de energía 10 de transmisión de enlace inverso de conformidad con los comandos de control de energía de enlace inverso contenidos en el canal compartido de enlace directo. 30,- El aparato de conformidad con la 15 reivindicación 29, caracterizado porque comprende: medios para ignorar en una estación de abonado pasiva que pertenece al grupo los comandos de control de energía de enlace inverso contenidos en el canal compartido de enlace directo. 20 31.- Un aparato para controlar la energía para los servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: medios para transmitir datos de usuario sobre un canal compartido de enlace directo;y medios para 25 transmitir comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo. 32.- El aparato de conformidad con la reivindicación 31, caracterizado porque dichos 5 medios para transmitir los comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo comprende: medios para perforar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 10 33.- El aparato de conformidad con la reivindicación 31, caracterizado porque dichos medios para transmitir los comandos de control de energía en el enlace inverso sobre un canal dedicado de enlace directo comprende: medios para 15 insertar el comando de control de energía de enlace inverso en el canal dedicado de enlace directo. 34.- Un aparato para controlar la energía para servicios múltiples de punto a punto en un 20 sistema de comunicaciones que comprende: medios para recibir una estación de abonado que pertenece a un grupo un canal compartido de enlace directo;medios para recibir en la estación de abonado un canal dedicado de enlace directo;y medios para 25 ajustar a una estación de abonado activa que pertenece al grupo la energía de transmisión de enlace inverso de conformidad con los comandos de control de energía de enlace inverso contenidos en el canal dedicado de enlace directo. 35.- Un aparato para controlar la energía para los servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: medios para determinar sectores cuya área de cobertura contienen estaciones de abonado activas que pertenecen a un grupo;y medios para transmitir comandos de control de energía de enlace inversos sobre un anal dedicado de enlace directo desde los sectores determinados. 3 6.- El aparato de conformidad con la reivindicación 35, caracterizado porque dichos medios para transmitir los comandos de control de energía de enlace inversos sobre un canal dedicado de enlace directo desde los sectores determinados comprende: medios para perforar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 37 . - El aparato de conformidad con la reivindicación 35, caracterizado porque dichos medios para transmitir los comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo desde los sectores determinados que comprende: medios para insertar los comandos de control de energía de enlace inverso en el canal dedicado al enlace directo. 5 38.- Un aparato para controlar la energía para los servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: medios para recibir en una estación de abonado que pertenece a un grupo un canal compartido de enlace 10 directo;medios para recibir en cada estación de abonado activa que pertenecen a un grupo un canal dedicado de enlace directo;y medios para ajustar en la estación de abonado activa la energía de transmisión del enlace inverso de conformidad con 15 los comandos de control de energía del enlace inverso contenidos en el canal dedicado de enlace directo. 39 .- Un aparato para controlar la energía para servicios múltiples de punto a punto en un 20 sistema de comunicaciones que comprende: medios para supervisar en un sector al menos un canal de enlace inverso para detectar una calidad métrica de un canal compartido de enlace directo;y medios para ajustar la energía del canal compartido de 25 enlace directo de conformidad con la calidad métrica peor. 40 . El aparato de conformidad con la reivindicación 39, caracterizado porque dichos medios para ajustar el canal compartido de enlace 5 directo de conformidad con la peor calidad métrica comprende: medios para disminuir la energía de canal compartido de enlace directo en una segunda cantidad si la calidad métrica de todos de al menos un canal de enlace inverso indica una 10 disminución en la energía. 41 .- El aparato de conformidad con la reivindicación 39, caracterizado porque dichos medios para ajustar la energía de canal compartido de enlace directo de conformidad con la peor 15 calidad métrica comprende: medios para incrementar la energía en el canal compartido de enlace directo en una segunda cantidad si la calidad métrica de al menos un canal de enlace inverso indica incrementar la energía. 20 42.- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: medios para determinar en cada estación de abonado que pertenece a un grupo una calidad métrica de un 25 canal compartido de enlace directo y medios para transmitir la calidad métrica determinada. 43 .- El aparato de conformidad con la reivindicación 42, caracterizado porque dichos medios para transmitir la calidad métrica 5 determinada comprende: medios para transmitir la calidad métrica determinada si la calidad métrica determinada es menor a un umbral. 44 .- El aparato de conformidad con la reivindicación 43, caracterizado porque dichos 10 medios para transmitir la calidad métrica determinada si la calidad métrica determinada es menor que el umbral comprende: medios para ’ transmitir la calidad métrica determinada si la calidad métrica determinada es menor que un umbral 15 predeterminado. 45 .- El aparato de conformidad con la reivindicación 43, caracterizado porque comprende: medios para incrementar el umbral en una primera cantidad si una información enviada sobre el canal 20 compartido de enlace directo se recibe con una matriz de decodificador suficiente. 46 .- El aparato de conformidad con la reivindicación 43, caracterizado porque comprende: medios para disminuir el umbral en una segunda 25 cantidad si una información enviada sobre el canal compartido de enlace directo se recibe con una matriz de decodificador insuficiente. 47 .- El aparato de conformidad con la reivindicación 42, caracterizado porque dichos medios para transmitir la calidad métrica determinada comprende: medios para transmitir la calidad métrica determinada sobre un canal dedicado de enlace inverso asignado a dicha estación de abonado. 48 .- El aparato de conformidad con la reivindicación 42, caracterizado porque dichos medios para transmitir la calidad métrica determinada comprende: medios para transmitir la calidad métrica determinada sobre un canal común de enlace inverso supervisado por la estación de abonado. 49 .- El aparato de conformidad con la reivindicación 48, caracterizado porque dichos medios para transmitir la calidad métrica determinada comprende: medios para que una estación de abonado solicite una asignación de un canal dedicado de enlace inverso sobre el canal común de enlace inverso supervisado por la estación de abonado;y medios para transmitir la calidad métrica determinada sobre el canal dedicado de enlace inverso. 50 .- El aparato de conformidad con la reivindicación 49, caracterizado porque dichos medios para que una estación de abonado solicite una asignación de un canal dedicado de enlace inverso que comprende: medios para que una estación de abonado solicite una asignación de un canal dedicado de enlace inverso sobre un canal de acceso. 51 .- Un aparato para controlar la energía para los servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: una unidad de control en una red de acceso configurada para determinar sectores cuya área de cobertura contiene estaciones de abonado activas que pertenecen a un grupo;y un sector acoplado de manera comunicativa a dicha unidad de control, configurada para transmitir comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo. 52 .- El aparato de conformidad con la reivindicación 51, caracterizado porque dicho sector transmite los comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo para estar configurado para perforar los comandos de control de energía de enlace inverso en el canal compartido de enlace directo. 53 .- El aparato de conformidad con la reivindicación 51, caracterizado porque dicho sector transmite los comandos de control de energía de enlace inverso sobre un canal compartido de enlace directo al estar configurados para insertar los comandos de control de energía de enlace inverso en el canal compartido de enlace directo. 54 .- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: una estación de abonado configurada para: recibir un canal compartido de enlace directo;y ajustar la energía de transmisión de enlace inverso de conformidad con los comandos de control de energía del enlace inverso contenidos en el canal compartido de enlace directo. 55 .- El aparato de conformidad con la reivindicación 54, caracterizado porque dicha estación de abonado además está configurada para ignorar los comandos de control de energía de enlace inverso contenidos en el canal compartido 84 de enlace directo si dicha estación de abonado no transmite sobre un enlace inverso. 56 .- Un aparato para controlar la energía para servicios múltiples de punto a punto en un 5 sistema de comunicaciones que comprende: un sector configurado para transmitir datos de usuario sobre un canal compartido de enlace directo;y transmitir comandos de control de energía de enlace inverso sobre un canal dedicado de enlace 10 directo. 57 .- El aparato de conformidad con la reivindicación 56, caracterizado porque dicho sector transmite comandos de control de energía de enlace inverso sobre un canal dedicado de enlace 15 directo al estar configurado para perforar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 58 .- El aparato de conformidad con la reivindicación 56, caracterizado porque dicho 20 sector transmite comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo al estar configurado para insertar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 25 59.- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: una estación de abonado configurada para: recibir un canal compartido de enlace directo;recibir un 5 canal dedicado de enlace directo;y ajustar la energía de transmisión de enlace inverso de conformidad con los comandos de control de energía de enlace inverso contenidos en el canal dedicado de enlace directo. 10 60.- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende: una unidad de control en una red de acceso configurada para determinar los sectores cuya área de
15
15 cobertura confieren estaciones de abonado activas que pertenecen a un grupo; y un sector acoplado de manera comunicativa a dicha unidad de control, configurada para transmitir comandos de control de energía de enlace inverso sobre un canal dedicado 20 de enlace directo desde sectores determinados. 61 .- El aparato de conformidad con la reivindicación 60, caracterizado porque dichas transmisiones de comandos de control de energía de enlace inverso sobre un canal dedicado de enlace 25 directo al ser configurado para perforar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 62 .- El aparato de conformidad con la reivindicación 60, caracterizado porque dicho 5 sector transmite comandos de control de energía de enlace inverso sobre un canal dedicado de enlace directo al estar configurado para insertar los comandos de control de energía de enlace inverso en el canal dedicado de enlace directo. 10 63.- Un aparato para controlar la energía para servicios múltiples de punto a punto en un sistema de comunicaciones que comprende:un sector configurado para supervisar al menos un canal de enlace inverso para detectar una calidad métrica 15 de un canal compartido de enlace directo;y una unidad de control en una red de acceso acoplada de manera comunicativa a dicho sector, configurada para ajustar la energía del canal compartido de enlace directo de conformidad con la peor calidad 20 métrica. 64 .- El aparato de conformidad con la reivindicación 63, caracterizado porque dicha unidad de control ajusta la energía de canal compartido de enlace directo al estar configurada 25 para disminuir la energía en el canal compartido de enlace directo en una segunda cantidad si la calidad métrica de todas de al menos un canal de enlace inverso indica disminución en la energía. 65 .- El aparato de conformidad con la 5 reivindicación 63, caracterizado porque dicha unidad de control ajusta la energía en el canal compartido de enlace directo al estar configurado para incrementar la energía en el canal compartido de enlace directo en una segunda cantidad si la 10 calidad métrica de al menos uno de al menos un canal de enlace inverso indica incremento en la energía. 66 .- Un aparato para controlar la energía para los servicios múltiples de punto a punto en 15 un sistema de comunicaciones, que comprende: una estación de abonado configurada para: determinar una calidad métrica de un canal compartido de enlace directo y transmitir la calidad métrica determinada.
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20 67.- El aparato de conformidad con la reivindicación 66, caracterizado porque dicha estación de abonado transmite la calidad métrica determinada al estar configurada para transmitir la calidad métrica determinada, si la calidad 25 métrica determinada es menor que un umbral. 68 .- El aparato de conformidad con la reivindicación 66, caracterizado porque dicha estación de abonado transmite la calidad métrica determinada al estar configurada para transmitir 5 la calidad métrica determinada si la calidad métrica determinada es menor que un umbral predeterminado. 69 .- El aparato de conformidad con la reivindicación 67, caracterizado porque dicha 10 estación de abonado además está configurada para incrementar el umbral a una primera cantidad si una información enviada sobre el canal compartido de enlace directo se recibe con suficiente decodificador métrico. 15 7 0.- El aparato de conformidad con la reivindicación 67, caracterizado porque dicha estación de abonado está configurada adicionalmente para disminuir el umbral en una segunda cantidad s i se envía una información 20 sobre el canal compartido de enlace directo y se recibe con insuficiente decodificador métrico. 71 .- El aparato de conformidad con la reivindicación 66, caracterizado porque dicha estación de abonado está configurada 25 adicionalmente para transmitir la calidad métrica determinada sobre un canal dedicado de enlace inverso, asignado a dicha estación de abonado. 72 .- El aparato de conformidad con la reivindicación 66, caracterizado porque dicha estación de abonado está configurada adicionalmente para transmitir la calidad métrica determinada sobre un canal común de enlace inverso supervisado por la estación de abonado. 73 .- El aparato de conformidad con la reivindicación 66, caracterizado porque dicha estación de abonado está configurada adicionalmente para:solicitar una asignación de un canal dedicado de enlace inverso sobre el canal común de enlace inverso supervisado por la estación de abonado;y transmitir la calidad métrica determinada sobre el canal dedicado de enlace inverso. 7 4.- El aparato de conformidad con la reivindicación 73, caracterizado porque dicha estación de abonado está configurada adicionalmente para solicitar una asignación de un canal dedicado de enlace inverso sobre un canal de acceso.

Independent claims16

162 paragraphs in 1 section, as filed

(54) Title: POWER CONTROL FOR POINT TO MULTIPLE POINT SERVICES PROVIDED IN WIRELESS SYSTEMS.

(54) Title: POWER CONTROL FOR POINT-TO-MULTIPOINT SERVICES PROVIDED IN COMMUNICATION SYSTEMS.

(57) Summary

To enable point-to-multi-point communication services in an existing cellular communication system infrastructure, each subscriber station of the element, for example, a subscriber station participating in such a service, is receiving a shared channel over direct loops, and also in certain modalities, a channel dedicated to the direct link. Since the transmission on the forward link channels that comes from surrounding sectors presents interference with the transmission that comes from the sector that serves the subscribing station, it is advisable to control the transmission power of the forward link channel to obtain a minimum acceptable power . In addition, a transmission mode of each subscriber station of the element that is on a reverse link channel exhibits interference with other subscriber stations. Therefore, it is recommended to control the transmission of the reverse link channel to obtain a minimum signal level. Accordingly, a method and apparatus for a control allowing point-to-multiple-point services in an existing infrastructure in a wireless cellular telephone system is described.

(57) Abstract

To enable point-to-multipoint communication Services in an existing cellular communication system infrastructure, each member subscriber station, ie, a subscriber station participating in such a Service, is receiving a forward link shared channel, and in certain embodiments additionally a forward link dedicated channel. Because transmission on the forward link channels from neighboring sectors presents interference to the transmission from the sector serving the subscriber station, it is to control the forward link channel transmission power to the minimum acceptable power. Additionally, a transmission form each member subscriber station on a reverse link channel presents interference to other subscriber stations. Therefore, it is desirable to control the reverse link channel transmission to the minimum signal level. Consequently, a method and apparatus for a per control that enables point-to-multipoint Services in an existing infrastructure of a wireless cellular telephone system is disclosed.

09/27/2003 23:37

4/50 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World In tellectual Property Organization International Burean (43) International Publication Date

October 2002 (10.10.2002)

PCT (MlllliHIllH (10) International Publication Number

WO 02/080401 A2 - * ....

ΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙίΙΙΙΙΙΙΙΗ ^ zv W080 / Z0OA1 (51) International PatentClassification7: H04B7 / O0 (21) International Application Number: PCT / US02 / 09825 (22) International Filing Date: 28 Mureh 2002 (28.03.2002) (25) Filing Language: English (26) Publication Language; English (30) Prlorlty Data:

60 / 279,970 March 28, 2001 (03/28/2001) US (71) Applicant: QUALCOMMINCORPORATED [US / US]; 5775 Morehouse Drive, San Diego, CA 92121-1714 (US).

(72) Inventor: CIIEN, Tan; 5415 Harvest Run Drive, San Diego. CA 92130 (US). TIEDEMANN, Edwsrd, G., IIP, 656 Barreta Mili Road, Concord, NIA 01742 (US). WANG, Jun; 13203 Winsianley Way, San Diego, CA 92130 (US).

(74) Agenta: WADSWORTH, Philip, R. et al .; Qualcomm Tncmporated, 5775 Morehouse Drive, CA 92121-1714 (US).

(81) Designaled States (ηαΐίοηοΐ): AE, AG, AL AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, ES, E, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, OM, PH, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VN, YU, ΖΑ, ΖΜ, zw.

(84) Designated States (regional): ARITO patent (GH, GM, KE, LS, MW, MZ, SD, SL SZ, TZ, UG, ZM, ZW), Eurasian patent (AM, AZ, BY¡ KG, KZ, MD, RU, TJ, TM), European patent (AT, BE, CH, CY, DE, DK, ES, H, FR, GB, GR, ΙΕ, ΓΓ, LU, MC, NL, PT, SE, TR), OAPI patent (BF, BJ, CF, CG, Cl, CM, GA, GN, GQ, GW, ML, MR. ΝΈ, SN, TD, TG).

Published:

- vfithout inlernational search repori and io be republished upan receipl of that report

Pbriwo-lctler cades and other abbrevialions, refer to the Guidance Notes on Codes and dbbreviations appearing at the beginning of each regular issue of the PCT Gazette.

(54) Tifie: POWER CONTROL FOR POINT-TO-MULTIPOINT SERVICES PROVIDED IN COMMUNICATION SYSTEMS

(57) Abstraen To enable point-to-multipoint communication Services in an existing cellular communication systetninfrastructure, each member subscriber station, Le., A subscriber station participating in such a Service, is receiving a forwari link shared channel, and in certain embodiments additionally a forwari link dedicated channel. Because transmission on the forwari link channels from neighboring seclors presents interference to the transmission from the sector serving the subscriber station, it is desirable to control the forward link channel transraission power to the minitnum acceptahle power. Additionally, a transmission lines each metnber subscriber station on a reverse link channel present interference to the other subscriber stations. Thercfore, it is desirable to control the reverse link channel transmission to the minimum signal levcl. Consequently, a method and apparatus for a per control that enables point-to-multipoint Services in an existing iofrastnicture of a wireless cellular telephone system is disclosed.

ENERGY CONTROL FOR MULTIPLE POINT-TO-POINT SERVICES PROVIDED IN COMMUNICATIONS SYSTEMS

Field of Invention

The present invention relates to multiple point-to-point services in a wired or wireless communication system. More specifically, the present invention relates to a method and apparatus for controlling power in a point-to-point multi-service communication system.

Background of the Invention

Communication systems have been developed to allow the transmission of information signals from a source station to a physically different destination station. In the transmission information signal from the originating station on a communication channel, the information signal is first converted into a form suitable for efficient transmission on the communication channel. Conversion or modulation of the information signal involves varying a parameter of a carrier wave in accordance with the information signal in such a way that the spectrum of the resulting modulated carrier is confined within the parameter of the channel bandwidth. communications. At the destination station the original information signal is replicated from the modulated carrier wave received on the communication channel. Such replication is generally achieved using a process inverse to the modulation process used at the home station.

Modulation also facilitates multiple access, that is, simultaneous transmission and / or reception of various signals over a common communication channel. Communications and multiple access systems often include a plurality of remote subscriber terminals that require intermittent service of a relatively short duration rather than continuous access to the common communication channel. Various multiple access techniques are known in the art such as time division multiple access (TDMA), frequency division multiple access (FDMA) and amplitude modulation multiple access (AM). Another type of multiple access technique is a code division multiple access (CDMA) spread spectrum system that complies with the Mobile Base Station Compatibility Standard.

TIA / EIA / IS-95 for the Cellular Dual Mode Broadband Spread Spectrum System, hereinafter referred to as the IS-95 standard. The use of CDMA techniques in a multiple access communication system is described in US Patent No. 4,901,307, entitled DISSEMINATION SPECTRUM MULTIPLE ACCESS COMMUNICATION SYSTEM WITH THE USE OF A SATELLITE OR LAND REPEATERS, and the US Patent No. 5,103,459, entitled SYSTEM AND METHOD FOR GENERATING WAVE FORMS IN A TELEPHONE SYSTEM

CDMA CELL, both assigned to the applicant of the present invention.

A multiple access communication system can be wired or wireless and can carry voice and / or data. An example of a communication system that carries both voice and data is a system in accordance with the IS-95 standard, which specifies the transmission of voice and data over a communication channel. A method for transmitting data in fixed-size code channel frames is described in detail in US Patent No. 5,504,773, entitled METHOD AND APPARATUS FOR THE FORMATION OF DATA FOR TRANSMISSION, assigned to the applicant of the present invention. In accordance with the IS-95 standard, data or voice is divided into code channel frames that are 20 milliseconds wide with data rates as high as 14.4 kbps. Additional examples of a method of a communications system that carry both voice and data include communications systems that conform to the Third Generation Participation Project (3GPP), set out in a set of documents that includes documents with Nos. 3G TS 25.211 , 3G TS 25.212, 3G 5S 25.213 and 3G 5S 25.214 (the W-CDMA standard), or the TR-45.5 Physical Layer Standard for cdma2000 Spread Spectrum Systems (IS-2000 standard).

In a multiple access communication system, communications between users are carried out through one or more base stations. A first user at a subscriber station communicates with a second user at a second subscriber station by transmitting data on a reverse link to the base station.

The base station receives the data and can route the data to another base station. The data is transmitted on a direct link from the same base station, or the other base station, to the second subscriber station. Similarly, communication can take place between a first user at a mobile subscriber station and a second user at a station on a land line. A base station receives data from the user on a reverse link and routes the data through a public switched telephone network (PSTN) to the second user.

In a wireless communication system it is of utmost importance to make the most of a communication system capacity in terms of the number of simultaneous telephone calls that can be handled. The capacity in a spread spectrum communications system can be maximized if the transmission power of each subscriber station is controlled such that each transmitted signal reaches a base station receiver at the same signal level. However, if a signal transmitted by a subscriber station reaches the base station receiver at a power level that is too low, good quality communication cannot be achieved due to interference from other subscriber stations. On the other hand, if a signal transmitted from a subscriber station is at an energy level that is too high when received at the base station, communication with this particular subscriber station is acceptable, however this high energy signal acts as interference with other subscriber stations. This interference can adversely affect communications with other subscriber stations. Therefore, each subscriber station needs to transmit the minimum signal level expressed as an example, a signal-to-noise ratio, that allows the recovery of the transmitted data.

Consequently, the transmission energy of each subscriber station within the coverage area of a base station is controlled by the base station to produce the same nominal signal energy received at the base station. In an ideal case, the total signal energy received at the base station equals the nominal energy received from each subscriber station multiplied by the number of subscriber stations transmitting within the coverage area of the base station plus the energy received at the base station from the subscriber stations in the coverage area of the nearby base stations.

The energy received is determined by an attenuation of the energy transmitted by a loss of path of the link. Path loss can be characterized by two separate phenomena: average path loss and gradual fading. In many communication systems, eg IS-95, WCDMA, IS-2000, the forward link and the reverse link are assigned with separate frequencies, that is, the forward link operates on a different frequency than the reverse link. However, because the frequencies and the forward link and the reverse link are within the same general frequency band, there is a strong correlation between the average path loss of the two links. On the other hand, fading is an independent phenomenon for the forward link and the reverse link and varies as a function of time.

In an exemplary CDMA system, each subscriber station estimates a forward link path loss based on the total energy at the input to the subscriber station. Total power is the sum of power from all base stations operating on the same frequency assignment as perceived by the subscriber station. From the estimate of the average forward link path loss, the subscriber station sets the transmission level of the reverse link signal. The reverse link channel for a subscriber station may suddenly improve compared to the forward link channel for the same subscriber station due to independent fading of the two channels, the signal as received at the base station from this station of subscriber could increase in energy. This increase in energy causes additional interference on all signals that share the same frequency assignment. In this way, a rapid response of the transmission power from the subscriber station to the sudden upgrade in the channel would improve the performance of the system. Therefore, it is necessary to have a base station that continuously contributes to the power control mechanism of the subscriber station.

In this way, the transmission power of the subscriber station is controlled by one or more base stations. Each base station, with which the subscriber station is in communication, measures the strength of the signal received from the subscriber station. The measured signal strength is compared to a desired signal strength level for that particular subscriber station. At each base station a power setting command is generated and sent to the subscriber station on the forward link. In response to the power adjustment command at the base station, the subscriber station increases or decreases the transmit power of the subscriber station by a predetermined amount. This method makes a rapid response to a change in the channel and improves the performance of the average system. Note that in a typical cellular system, the base stations are not directly connected and each base station in the system does not know the power level at which the other base stations receive the signal from the subscriber station.

When a subscriber station is in communication with more than one base station, power setting commands are provided from each base station. The subscriber station acts on these multiple base station power setting commands to avoid transmitting power levels that may adversely interfere with other subscriber station communications, and still provide sufficient power to support communication from the subscriber's station to at least one of the base stations. This power control mechanism is accomplished by causing the subscriber station to increase its transmit signal level only if each of the base stations with which the subscriber station is in communication requests an increase in power level. The subscriber station lowers the transmit signal level of the subscriber station if any base station, with which the subscriber station is in communication, requests that the power be lowered. In US Patent No. 5,056,109, entitled METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION ENERGY IN A SYSTEM

CDMA CELLULAR MOBILE TELEPHONE, filed on October 8, 1991, assigned to the applicant of the present invention, describes a system for the control of energy of the subscriber station and base station.

In addition to the reverse link energy control described above, it is also desirable to control the relative energy used in each traffic channel transmitted over a forward link by the base station. To enable such control, each remote station measures the energy of traffic channels received from a base station, generates control information in response, and transmits the control information back to the base station. The primary reason for providing such control is to fix certain locations where the forward link might be in unusual poor condition. Unless the power transmitted to the poor subscriber station is increased, the signal quality may become unacceptable. An example of such a location is a point where the path loss to one or two neighboring base stations is roughly the same as the path loss to the active base station, ie, a base station communicating with subscriber station. At such a location, the total interference can increase three times over the interference that is observed by a subscriber station at a point relatively close to the active base station. Furthermore, the interference coming from neighboring base stations does not gradually attenuate in unison with the signal from the active base station, as would be the case for interference coming from the active base station. A subscriber station in such a situation may require 3 to 4 dB additional signal power from the active base station 15 to achieve adequate performance. At another time, the subscriber station may be located where the signal-to-interference ratio is often not good. In such a case, the base station can transmit the desired signal 20 using lower than normal transmission power, reducing interference to other signals transmitted by the system.

The wireless communication service described in the previous paragraphs is an example of point-to-point communications. In contrast, a point-to-multiple-point service is a service where the information transmitted by an information source was created for a plurality of mobile stations. The basic model of a point-to-multiple point system comprises a set of users, a group of which receives service from one or more information sources, in which information is provided with a certain content, for example, news, movies, sporting and similar events, which will be transmitted to users. Each subscriber station participation of the user in the point-to-multipoint service (a member subscriber station) monitors a shared forward link channel. Because the information source fixedly determines the content, users generally do not return the communication.

Examples of the common use of such point-to-point multi-service communication systems are television transmission, radio transmission, and the like. Alternatively, the information source is a user, a member of a group, who transmits information created for the other members of the selected group. If the user wants to talk, he presses a button to talk (PTT). Typically, the voice of the speaking users is routed from the subscriber station to a receiving station on a dedicated reverse link. The transceiver station then transmits the voice of the user speaking on the shared forward link channel. As is the case with the point-to-point communication system, such a communication system allows both land line and wireless subscriber stations to access the system. Such a point-to-multiple-point service is also known as a group service. Examples. of the use of the group service communications system is in dispatch services, such as local police radio systems, radio taxi dispatch systems, Federal Intelligence Agency and secret service operations, and in communications systems general military.

The point-to-multi-point service communication systems mentioned in the preceding paragraph are generally highly specialized communication systems built for one purpose. With recent advances in the wireless cell phone system there has been an interest in using the existing infrastructure of point-to-point cell phone systems primarily 5 for multiple point-to-point services.

As used herein, the term cellular system includes the operation of a system on both cellular and personal communication system (PCS) frequencies.

The power control mechanism for subscriber stations acting as point-to-point units described above does not directly apply to multiple point-to-point services. As discussed, wireless cell phone systems assign a dedicated forward and reverse link between two or more communicating users. In contrast, multiple point-to-point services typically rely on the allocation of a shared forward link that will be monitored by all users in the group. Additionally, in a point-to-multiple-point service, in general, most subscriber stations are passive (ie just listening) at any time. When a subscriber station is passive, it does not necessarily have an established reverse link on which it transmits information to the base station. Because the energy control method in existing infrastructure is based on a point-to-point communications model, there is a need in the art for a method and apparatus to control energy that enables group services in an infrastructure. existing wireless cellular phone system.

Summary of the Invention

In one aspect of the invention, the needs raised in previous paragraphs are solved by controlling the energy of the reverse link channel by determining sectors whose coverage area contains active subscriber stations belonging to a group; and transmit reverse link power control commands on a forward link common channel from the determined sectors. The forward link common channel is received at each subscriber station belonging to a group; and the reverse link transmission energy is adjusted in the active subscriber stations belonging to a group in accordance with the reverse link energy control commands contained in the forward link common channel.

In another aspect of the invention, the needs outlined in the preceding paragraphs are addressed by controlling reverse link channel power in a point-to-multiple point communication system by transmitting user data over a common forward link channel; and transmitting reverse link power control commands on a dedicated forward link channel. The needs mentioned in previous paragraphs are additionally solved by receiving at each subscriber station belonging to a group a common direct link channel; receiving at each subscriber station belonging to a group a dedicated forward link channel; and adjusting the reverse link transmission energy in the active subscriber stations belonging to a group in accordance with the reverse link energy control commands contained in the dedicated forward link channel.

In another aspect of the invention, the aforementioned needs are solved by controlling the energy in a reverse link channel in a point-to-multi-point communication system by determining in the access network sectors whose coverage area 5 contains active subscriber stations belonging to a group; and transmitting reverse link power control commands on a dedicated forward link channel from the determined sectors. The above-mentioned needs are further solved by receiving at each subscriber station belonging to a group a common forward link channel; receiving at each active subscriber station belonging to a group a dedicated forward link channel 15; and adjusting the reverse link transmission energy in the active subscriber stations belonging to a group in accordance with the reverse link energy control commands that are contained in the dedicated channel of the forward link.

In one aspect of the invention, the needs mentioned in previous paragraphs are solved by controlling the channel energy of a forward link in a communication system from point to multiple points by monitoring in a sector at least one reverse link channel to detect a metric. quality of a shared direct link channel; and adjusting the shared channel power on the forward link according to the worst quality metric 5.

In another aspect of the invention, the aforementioned needs are solved by controlling the energy of the forward link channel in a multiple point-to-point communication system 10 of each subscriber station that belongs to a group of a quality metric of a channel. direct link sharing; conveying the determined quality metric.

Brief Description of Figures

Figure 1 illustrates a conceptual diagram of a group service communication system;

Figure 2 illustrates a conceptual diagram of a forward link channel with a fixed data rate; and

Figure 3 illustrates a conceptual diagram of a variable data rate forward link channel.

Detailed Description of the Invention

Definitions

The word exemplary as used herein means that it functions as an example, or illustration. Any embodiment described herein as exemplary should not necessarily be construed as being preferred or advantageous over other embodiments.

The term "point-to-point communication" as used herein means a communication between two subscriber stations over a dedicated transfer communication channel and a dedicated reverse communication channel.

The term "point-to-multi-point communication service" as used herein means a communication wherein a plurality of subscriber stations receive communication from, typically, an originating source. Said services can comprise, for example, group service, where the source is a subscriber station, a transmission service, where the source is a central station, or a multiple transmission service, where the receiver comprises a subset of the plurality of subscriber stations.

The term "access network" as used herein means a connection of base stations (BS) and one or more base station controllers. 5 The access network carries data packets between multiple subscriber stations. The access network can further be connected to additional networks outside the access network, such as a corporate intra-network or the Internet, and can carry data packets between each access terminal and said external networks.

The term "base station" as used herein means the hardware with which the subscriber stations communicate. Cell refers to the hardware of a geographic coverage area, depending on the context in which the term is used. A sector is a division of a cell. Because a sector has the attributes of a cell, the teachings described in cell terms are easily extended to sectors.

The term "subscriber station" as used herein means the hardware with which an access network communicates. A subscriber station can be mobile or stationary. A subscriber station can be any data device that communicates over a wireless channel or through a wired channel, for example using fiber optics or coaxial cables. The subscriber station can additionally be any of several types of devices including, but not limited to, a PC card, compact flash memory, internal or external modem, or a wireline or wireless telephone. A subscriber station that is in the process of establishing an active traffic channel connection with a BS is said to be in a connection establishment state. A subscriber station that has established an active traffic channel connection with a BS is called an active subscriber station, and is said to be in a traffic state.

The term "forward channel / link" as used herein means a communication channel / link through which a base station sends signals to a subscriber station.

The term "reverse channel / link" as used herein means a communication link / channel through which the base station sends signals to the base station.

The term "physical channel" as used herein means a communications path over which a signal travels described in terms of modulation coding and characteristics.

The term "logical channel" as used herein means a communications path within the protocol layers of any base station or subscriber station.

The term "communications channel" as used herein means a physical channel or a logical channel in accordance with the context.

The term "soft handover" as used herein means a communication between a subscriber station and two or more sectors, where each sector belongs to a different cell. Reverse link communication is received by both sectors, and forward link communication is carried out simultaneously on the two or more transfer links of the sectors.

The term "smoother handoff" as used herein means a communication between a subscriber station and two or more sectors, where each sector belongs to the same cell. Reverse link communication is received in both sectors, and forward link communication is carried simultaneously on one of two or more transfer links 5 of the sector.

The term "perforation" is used herein to mean the replacement of the first information content of a first size with a second information content of a first size.

The term "dedicated channel" as used herein means a channel modulated by specific information towards an individual subscriber station.

The term common channel as used herein means a channel modulated by information shared between all subscriber stations.

The term user data or payload as used herein means the data other than the control data.

The term control data as used herein means data that enables the operation of entities in a communications system. '

Description

Figure 1 illustrates a conceptual diagram of a communication system 100 capable of providing multiple point-to-point services in accordance with the embodiments of the present invention. For tutoring purposes !, the following description illustrates a group call; however, one skilled in the art understands how to apply the described concepts for other multiple point-to-point services. A (home) group is defined by group membership, comprising subscriber station users who talk to each other often enough to establish the calling group. The calling group is said to be in the idle state when no member is active or idle, for example all members are off or not participating in the calling group. The calling group is idle when at least one member participates in the group. The calling group is in the active state when one of at least one initiates a group call. A group call is divided into active and silent periods. The group call is in the active period when there are transmissions between the members without long free periods. The calling group is in the silent period when no member transmits any traffic during a period that exceeds the longest free period.

In an active period, a group user at a member subscriber station, for example, a member subscriber station 102 (1) communicates user information (voice or data) to 10 other group users at member subscriber stations 102 ( 2) through 102 (5) through an access network comprising base stations 104 and a controller 110. For the sake of accuracy, the term member subscriber station is used hereinafter to mean subscriber at a subscriber station unless otherwise indicated. Although the term base station is used, one of skill in the art knows that the modalities apply equally to all 20 sectors. Base stations 104 are connected to controller 110 via reverse paths 112. The term reverse path is used to mean a communication link between a controller and a base station. Reverse path 112 may be implemented in various types of connection including for example an El or TI, wireline or microwave, fiber optic, and other types of connection known to one of ordinary skill in the art. Controller 110 connects to interface unit 114, which interfaces communication system 100 with other services (not shown), for example, a public switched telephone network (PSTN); a Packed Data Service Node (PDSN), and other services 10 known to one of skill in the art.

When a member subscriber station, eg, subscriber station 102 (1), wishes to transmit user data to the group over the reverse link, the member subscriber station 15 needs to request a reverse link assignment and transmission request. In one embodiment, the subscriber station 102 (1), sends an access channel message requesting a reverse link to the base station, eg, base station 104 (1). The access message is sent over an access channel. The access channel is a reverse link channel used by the subscriber stations to communicate with the base station. The access channel is used for short signaling message exchanges as call, search response and registration sources. The subscriber station sends out an access attempt on a series of access probes. Each access probe carries the same information, but is transmitted at a higher energy level than the previous one. Access probes continue until receiving a confirmation from the base station at the subscriber station. However, one skilled in the art recognizes that other access provisions 10 apply in the same manner as those described in provisional application serial number 60 / 279,970, entitled METHOD AND APPARATUS FOR GROUP CALLS USING COMMON AND DEDICATED CHANNELS. IN WIRELESS NETWORKS, filed on March 28, 2001, assigned to the applicant of the present invention.

Once the communicating (active) member subscriber station 102 (1) receives an assigned reverse link channel 108 (1), the subscriber station 102 (1) can transmit information to a base station 104 (1) . The reverse link assignment is detailed in a previously mentioned provisional application with serial number 60 / 279,970, entitled METHOD AND APPARATUS FOR 25 GROUP CALLS USING DEDICATED CHANNELS AND

COMMON IN WIRELESS NETWORKS, filed on March 28, 2001, assigned to the applicant of the present invention, are equally applicable. Base station 104 (1) routes for received information to base stations 104 (2) and 104 (3), and transmits the received information on a shared forward link channel 106 (1) to the user (102 (2). Base stations 104 (2) and 104 (3) transmit the routed information on shared forward link channels 106 (2) and 106 (3). To receive the information from the active member subscriber station 102 (1), all the member subscriber stations of an active group, that is, the subscriber stations 102 (1) to 102 (5) are assigned to monitor the channels Forward link 106 shares from its individual base stations 104 during active group calls. In general, shared forward link channels 106 (1), 106 (2), and

106 (3) assigned by the respective base stations or 104 (1), 104 (2) and 104 (3) are different from each other. However, to allow for improved reception of member subscriber stations 102 located in overlapping coverage areas, forward link shared channel 106 can be transmitted asynchronously by more than one sector or base station 104. The method for improved reception of the shared channel as a direct link in overlapping coverage areas is described in the pending application with serial number 09 / 933,607, entitled METHOD AND SYSTEM FOR A TRANSFER IN A TRANSMISSION COMMUNICATIONS SYSTEM, filed on August 20, 2001, assigned to the applicant for the present invention.

In one embodiment, forward link shared channel 106 is modulated by user information created for group member subscriber stations and control data, necessary for call maintenance, eg, signaling information, information of power control and other information known to those of skill in the art. However, the limited capacity of the forward link shared channel can prevent modulation by both call information and call information. Accordingly, in another embodiment, only user information is transmitted on the shared forward link channel 106, and the call maintenance information may be modulated on a further forward link channel. In this case, each subscriber station 102 must monitor, in addition to the forward link shared channel, additional forward link channels, which comprise the call maintenance information. Said additional channel may be a dedicated channel or a common channel, as described in the previously mentioned provisional application with serial number 60 / 279,970, entitled METHOD AND APPARATUS FOR GROUP CALLS USING DEDICATED AND COMMON CHANNELS IN WIRELESS NETWORKS, filed on 28 March 2001, assigned to the applicant of the present invention and apply in the same way.

In one embodiment, the passive subscriber stations 102 (2), 102 (3), and 102 (4) do not establish reverse links for any of the base stations 104. Note that if the subscriber stations 102 (2), 102 (3) ) and 102 (4) are completely passive, individual base stations may not know if the subscriber stations are in their corresponding coverage areas. Even if a subscriber station registers with the base station when it enters the coverage area of a base station, the base station has no way of knowing when the subscriber station has left the coverage area of the base station.

Even if the subscriber stations 102 (2), 102 (3) and 102 (4) are passive, they can still use the reverse link channel to communicate with the base stations. In the preferred embodiment, passive subscriber stations 102 (2), 102 (3), and

102 (4) use the access channel to broadcast signals to the base station if they do not need more power from the forward link transmission channel. Said use of a reverse link channel is described in the provisional application mentioned in previous paragraphs with serial number 60 / 279,970, 15 entitled METHOD AND APPARATUS FOR GROUP CALLS

USING COMMON AND DEDICATED CHANNELS IN A WIRELESS NETWORK, filed on March 28, 2001, assigned to the applicant of the present invention applies in the same way.

It is well known in the art that base stations can be divided into two or more sectors. Accordingly, where the term "base station" is used herein, it implies that the term may refer to an entire base station or a single sector of a multi-sector base station. Additionally, although in the previous description the common information was provided with the subscriber station 102 (1), one skilled in the art understands that the concepts described apply in the same way for the common information provided by a source connected to the communication system 100. via interface unit 110.

A standard cellular system comprises a plurality of base stations, each of which provides communication for subscriber stations located within a limited coverage area. In addition to the plurality of base stations it provides coverage to a complete service area. However, if the forward link shared channel is broadcast over each base station within the system at all times, the cost of the system can be very high. A more economical and efficient way that provides overall superior capacity for the system is to transmit the forward link shared channel only from base stations where the coverage areas are a subscriber station participating in a located point-to-multipoint service. Consequently, the corresponding resources are available for other point-to-point or point-to-multipoint services. Furthermore, other users within the coverage area of base stations that do not transmit the forward link shared channel are not subject to interference from them.

As the description of the point-to-multi-point communication system indicates, to take full advantage of capacity, power control of the forward link transmission channel is required. Additionally, a power control of any dedicated forward link or reverse link channels is required.

Reverse Link Power Control

Reverse link power control is the method of controlling the energy of the channels that comprise the reverse link. In reverse link power monitoring, the station metric quality of the signal received from the subscriber station transmitting on a reverse link channel, compares the measured quality metric with a threshold (a set point) and requests that the active subscriber station increases or decreases the transmitted power level in accordance with the result of the comparison. The term "active (talker) subscriber station" as used herein means a subscriber station that transmits user data on a reverse traffic channel. As discussed above, in a group call, only one or a few subscriber stations belonging to a group transmit user data over a reverse link once. Consequently, no passive subscriber station member (the listener) has established the reverse link traffic channel to any of the base stations. The term passive as used herein means a subscriber station that monitors a shared forward link channel and any additional forward link channels if the additional forward link channel is transmitted, and does not transmit any user data over the reverse link. . Of course, passive subscriber stations can transmit non-user data, for example, control and feedback data on a suitable reverse link channel. The further reverse handover channel may comprise a dedicated channel on which the subscriber station receives, for example, signaling information, power control information, header information, and different types of information known to one skilled in the art. Channel assignment 5 for the shared forward link channel and optional additional forward link channels are dependent on the communication system. Thus, for example, in a communication system conforming to the IS10 2000 standard, examples of transfer channel assignments are listed in Table 1.

TABLE 1

<td></td><td>Transfer link</td><td></td><td>Reverse link</td>

<td>Group</td><td>Common</td><td>Dedicated</td><td></td>

<td>II</td><td>F-SCH</td><td>None</td><td>No reverse link transmission by listeners1</td>

<td></td><td>F-BCCH</td><td>None</td><td>No reverse link transmission by listeners1</td>

<td> 10</td><td>F-CCCH</td><td>None</td><td>No reverse link transmission by listeners1</td>

<td>III</td><td>F-SCH</td><td>F-CPCCH for the speaker</td><td>No reverse link transmission by listeners1</td>

<td></td><td></td><td>F-CPCCH for everyone</td><td>R-DCCH or R-FCH or combination2</td>

<td> 15</td><td>F-BCCH</td><td>F-CPCCH for the speaker</td><td>No reverse link transmission by listeners1</td>

<td></td><td></td><td>F-CPCCH for everyone</td><td>R-DCCH or R-FCH or combination2</td>

<td></td><td>F-CCCH</td><td>F-CPCCH or for the speaker</td><td>No reverse link transmission by listeners1</td>

<td> 20</td><td></td><td>F-CPCCH for everyone</td><td>R-DCCH or R-FCH or combination2</td>

Notes: 1The necessary system data is transmitted by the listeners using the reverse access channel (R-ACH)F the Reverse Enhanced Access Channel (R-EACH) or the Common Control Channel (R-CCH).

2For example, the speaker uses the R-FCH, the listeners use the R-DCCH

Abbreviations:

<td></td><td>F-SCH</td><td>Complementary transfer channel</td>

<td></td><td>F-BCCH</td><td>Transfer Transmission Channel</td>

<td></td><td>F-CCCH</td><td>Common transfer control channel</td>

<td></td><td>F-DCCH</td><td>Dedicated transfer control channel</td>

<td></td><td>F-FCH</td><td>Fundamental transfer channel</td>

<td></td><td>F-CPCCH</td><td>Transfer common power control channel</td>

<td> 10</td><td>R-DCCH</td><td>Reverse dedicated control channel</td>

<td></td><td>R-FCH</td><td>Reverse fundamental channel</td>

One skilled in the art recognizes that the channel assignment determined in Table 1 for both the transfer channels and the channels is for tutorial purposes only. Consequently, the additional combinations of the shared forward link channel and the optional additional forward link channel exist as described in an also pending application with serial number XX / XXX, XXX, entitled METHOD AND APPARATUS FOR MANAGING CHANNELS FOR SERVICES POINT-TO-POINT MULTIPLE IN A COMMUNICATIONS SYSTEM, presented on March 28,

2002, assigned to the applicant for the present invention. Additionally, one skilled in the art will be able to adapt the ideas of the invention described in the embodiments presented to communication systems in accordance with other standards.

In a channel assignment method using both the shared forward link channel and the dedicated forward link channels assigned individually, i.e. group 1 of Table 1, all sectors whose coverage area contain subscriber stations that participate in the group of the group call use a power control subchannel, for example, F-PCSCH, which is used at a predetermined rate, for example, 800 bits per second (bps) on each individually allocated dedicated forward link channel, eg, F-DCCH or ΓΓΟΗ for subscriber stations transmitting on a reverse link.

In a channel assignment method that uses only the common forward link traffic channel, that is, group II of Table 1, in one embodiment, the sectors whose coverage area contains only the listeners participating in the call do not they transmit reverse energy control signals. The sectors whose coverage area contains the active subscriber stations use a subchannel, for example, a transfer power control subchannel (F-PCSCH), which is punctured at a predetermined rate, for example 800 bits per second ( bps) over the common forward link traffic channel, for reverse link power control. In an alternate mode, the power control information is not punctured within the common forward link traffic channel like an F-PCSCH, however the power control information is transmitted as an understream of a common power control channel. (F-CPCCH), that is, the power control information is inserted at a predefined position within the common forward link power control channel. The active subscriber stations process the received F-PCSCH by the F-CPCCH understream and adjust the transmission power accordingly. Passive subscriber stations in the sectors transmitting the subchannel achieve the information from F-PCSCH or F-CPCCH. A control unit located in the individual sector, in a base station that comprises the sector, in the controller, or any other element that comprises the access network, determines whether a coverage area of a sector contains the active subscriber station.

In a channel assignment method that uses a shared forward link channel and the subscriber stations transmitting on a reverse link, for example group III of Table 1 in one mode, the sectors whose coverage area contains only the The listeners participating in the call do not transmit any reverse energy control signal. The sectors whose coverage area contains the active subscriber stations use a dedicated power control subchannel, for example the F-PCSCH, towards each of the subscriber stations transmitting on a reverse link.

Direct Link Power Control

Forward link power control is the method of controlling the power of the channels that comprise the forward link. In a forward link shared channel, each subscriber station group call member measures a received common forward link traffic channel quality metric and transmits feedback information to the sectors transmitting the forward link traffic channel. common for the member subscriber station. 5 In one embodiment, the quality metric comprises a signal-to-noise ratio that is expressed in terms of energy per bit over interference (Eb/ Nt). However, one of skill in the art understands that other metric qualities, eg, bit-error ratio, frame-error ratio, and other metric qualities known in the art can be used. The feedback is transmitted over a reverse link established between the member subscriber station and the sector. Each sector receives feedback from those member subscriber stations in the coverage area of the sector transmitting on the reverse link and adjusts the transmission level to ensure that the desired quality of service (QoS) is delivered to all 20 stations. member subscriber. A control unit located in the individual sector, in a base station that comprises the sector, of the controller, or any other element that comprises the access network, determines the level of transmission.

As discussed above, the forward link condition for each subscriber station is different. Therefore, the sector is likely to receive conflicting forward link quality measurements from each subscriber station.

The industry must then process the conflicting forward link quality measurements and perform a forward link shared channel power adjustment. The industry adjusts the shared channel 10 to the direct link to satisfy the power requirement with the subscriber's station, which reports the worst metric quality of the direct link.

In the manner described in paragraph 15 above, all member subscriber stations report the quality metric by updating the quality metric measure. To decrease the reverse link signaling load and increase the battery life of a subscriber station, in another embodiment, the subscriber stations report the measured metric quality to the base station only if the measured metric quality is not satisfactory; in this way, each member subscriber station measures the metric quality and compares the measured metric quality with a threshold. If the metric quality is lower than the threshold, the subscriber station refrains from reporting the metric quality. Consequently, only subscriber stations with a measured metric quality below the threshold report the metric quality. The base station then adjusts the power of the common forward link traffic channel to meet the power requirement with the subscriber station, which supports the worst forward link quality metric.

When the subscriber station determines the metric quality of the forward link channel, the subscriber station needs to feed back the metric quality of the forward link to the base station on a reverse link. As discussed above, only active subscriber stations transmit a reverse link traffic channel, which can be used for feedback. Consequently, passive subscriber stations do not have a reverse link traffic channel established at any base station. However, passive remote stations may need to use a reverse link to communicate to the base stations the information necessary for the maintenance of the call, eg, handoff messages, power control, and other information known to one of ordinary skill in the art. Additionally, passive subscriber stations may wish to communicate, therefore passive subscriber stations need to use a reverse link to request a reverse traffic channel assignment.

The different exemplary modalities of reverse link channel assignment in a communications system in accordance with the IS-2000 standard are listed in Table 1, and will be discussed in that context. Additionally, one skilled in the art will be able to adapt the ideas of the invention described in the present embodiments to communication systems in accordance with other standards.

According to one embodiment, each passive subscriber station is assigned to a dedicated reverse link channel, eg the dedicated control channel (R-DCCH), by joining an active group (eg group I, group III from table 1). The subscriber station uses the R-DCCH to signal both regular calls (eg forward link pilot notification) and group call related signaling (eg quality metric reporting link transmission channel direct, requests a reverse link traffic channel allocation). When transmitting the R-DCCH, the member subscriber station also transmits a reverse pilot channel (R-PCH) and a reverse power control subchannel (R-PCSCH). The R-PCSCH carries feedback on a common transmit forward link channel quality metric.

In one embodiment, the data rate on the forward link shared channel is fixed; the industry uses full speed transfer power role (800 bps in accordance with the IS-2000 standard and 1600 bps in accordance with the W_CDMA standard). Forward link 200 for a fixed rate as illustrated in FIG. 2 is defined in terms of frames 202. A frame is a structure that comprises a specified period of time. Because the data rate is fixed, each frame 202 that transmits with the same energy Pt. Therefore, the current power control method can measure the metric quality of the forward link shared channel. A forward link shared channel quality metric may comprise, for example, a signal for interference to noise ratio (SINR) expressed, for example, as energy per bit over noise (Eb / Nt). A required target decoder of the member subscriber station performance metric determines a required forward link shared channel quality metric for that subscriber station. Said metric decoder 10 can be, for example, a decoded frame error ratio (FER), a bit error rate (VER), and / or another metric decoder known to one skilled in the art. The member subscriber station measures the average quality for the shared channel 15 of the forward link, compares the metric quality against a fixed or adaptation threshold, and sends power control commands in accordance with the comparison results. In one embodiment, the power control commands 204 comprise a stream of up or down commands (similar to FPC_MODE = '000' in accordance with the IS-2000 standard). The metric quality measurement and comparison can be carried out reliably by the subscriber station, because, as discussed, the data rates over the forward link shared channel are fixed, therefore not they change without notification to the member subscriber station. In an exemplary embodiment of an adaptation threshold setting, the threshold increases in a first step, for example,

0.5 dB, when a forward link shared channel data frame is correctly referenced. This threshold decreases a smaller step, for example 0.5 dB / (l / FERwanted-l), when the data frame on the forward link shared channel is incorrectly referred to. The FERdesired represents the desired frame erasure rate for the forward link shared channel.

In another embodiment, using the forward link shared channel and individually assigned dedicated transfer traffic channels, the forward link shared channel quality metric can be determined from the highest assigned dedicated transfer traffic channel quality metric of individually used by the member subscriber station. Because the transmitted rates over the forward link shared channel and the individually assigned dedicated transfer traffic channels are different, a suitable rate retransmission between the forward link shared channel and the assigned dedicated transfer traffic channels of 5 individually must be done. Forward link shared channel quality metric is determined by improving the individually allocated dedicated transfer traffic channel quality metric in accordance with rate retransmission 10.

The sector receives the power control commands transmitted on the reverse link dedicated channel and, in accordance with the modality, decreases a power transmission level of the forward link shared channel by an amount, for example 0.5 dB, when feedback from the subscriber station from all members requests to decrease power. The sector increases a transmission level of energy by the same amount when at least one member subscriber station requests to increase the energy.

In another embodiment, the feedback is in a form of messages on R-DCCH.

In another embodiment, the sectors use a split feedback on the Forward Link Shared Channel and the individually assigned dedicated transfer traffic channels and the dedicated transfer traffic channels are assigned. Split feedback splits the reverse link current power control commands into two undercurrents. As discussed, the power control stream in accordance with the IS-2000 comprises a stream of 800 bps. In this way, the first substream can comprise, for example, power control commands sent at 400 bps, the second substream then comprises, power control commands sent at 400 bps. Substreams can be formed, for example, by assigning even-numbered feedback bits to the first substream and even-numbered feedback bits to the second substream. The first substream carries the power control commands for the forward link shared channel, the second substream carries the power control commands for the dedicated transfer traffic channels. In accordance with this method, the feedback current power control commands for the forward link shared channel from each member subscriber station within the same sector may be in the form of an up and down command sequence (similar a FPC_MODE = '001' 0 Ό10 'according to IS-2000) or a stream of Erase Indicator Bits (EIB) (similar to FPC_MODE =' 110 'according to IS2000). From this set of feedback for the Shared Transfer Channel, the sector can establish the transmission level for that Shared Direct Link Channel to meet quality requirements and conserve energy consumption. EIBA feedback also provides the base station with rapid feedback on the reception of the subscriber station member of the Direct Link Shared Channel. This specific feedback makes it easier for the physical layer to initiate retransmission before the NAK (negative acknowledge) from higher layers, if such retransmission is desired and feasible. Feedback on dedicated channels is processed in accordance with any method applicable to the point-to-point control power control method.

The sector receives the energy control bits and, according to the modality, increases its energy transmission level of the traffic channel that transmits transmission by a first amount, for example, 0.5 dB, when the feedback is at least. least one 10 member subscriber station requests power increase or indicates a clearing. The sector decreases the power transmission level by a second amount, when each member subscriber station requests the power decrease or indicates no erasure.

In another embodiment, the data rate on the forward link shared channel is transmitted with a variable data rate, as illustrated in Figure 3. Because the data rate is variable, each frame 300 is transmitted with a energy P corresponding to the data rate transmitted in said frame. In this way, for example, frame 300 (n) a full rate frame, is transmitted with a 25 energy Pt3, a frame of average speed 300 (1) is transmitted with an energy Pt2, and a frame of speed 300 (2) is transmitted with an energy Pft. To enable the subscriber station power control to correctly estimate the metric quality of the shared channel of the forward link, the feedback power control commands for useful link power control on its channel, for example, a power transfer control subchannel 10 (F-PCSCH), which is punched at a predetermined rate, for example 800 (bps) in the common forward link traffic channel with constant energy. In an alternative embodiment, the power control information is not pierced in the common forward link traffic channel as

F-PCSCH, however, the power control information is transmitted as a substream of a Common Transfer Power Control Channel (F-CPCCH), that is, the power control information is incested at a defined position previously in the common power control channel of the common forward link. The power control bits for reverse link power control can be used to measure the metric quality of the Forward Link Shared Channel.

In one embodiment, the feedback power control commands for forward link power control can be messaged on the R-DCCH individually.

In one embodiment, the feedback power control commands for forward link power control can be sent as an EIB over an R-PCSCH. In one embodiment, the energy control bits that correspond to a frame are grouped to form an EIB area. In another embodiment, some bits in a frame are grouped together to form an EIB while the remaining bits carry a detailed amount of SINR deficit or excess detected by the member MS. In one embodiment, if there are no individually assigned dedicated channels, all power control commands sent over the R-PCSCH are used to control the Forward Link Shared Channel.

Alternatively, the passive member subscriber station is R-DCCH unassigned. (For example, group II, group III from table 1). Member subscriber stations use access paths, eg R-ACH, R-EACH or control channels, eg R-CCCH, or to send any information to the base station.

Accordingly, in accordance with one embodiment, instead of providing energy control feedback in a direct current form of energy commands, the energy control feedback is provided in a form of modulated messages on R-ACH, R -EACH or the R-CCCH. This alternative is attractive because member subscriber stations do not continuously update the metric quality of a forward link shared channel, but instead send a message. feedback only when the updated quality metric falls below a certain threshold. In one embodiment, the message is sent when an average frame error rate (FER) over the 50 most recent frames is 4% or higher. However, one of skill in the art recognizes that, in an alternative embodiment, the message can be generated each time the quality of the metric is updated. Within the message, various' fields or quality indications can be included. For example, there may be a field that indicates the intensity at which the subscriber station perceives the pilot signal from the base station. Alternatively, there may be a field that indicates the strength or quality at which the subscriber station receives the forward link transmission channel. There may be a field indicating the signal strength or quality of the pilot channel and forward link transmission channel. There may be a field that indicates the difference between a ratio of the signal strength to the strength of the forward link transmission channel; the quality of the group calling channels, or the desired increase in the received signal relative to the noise-to-interference ratio, and other related information known to those skilled in the art.

The base station periodically lowers the. forward link shared channel transmission energy level first by an amount if the sector does not receive a feedback message from a subscriber station to a member requesting an energy increase. The base station increases the forward link shared channel transmission energy level 25 by a second amount when it receives a message requesting the energy increase from one or more member subscriber stations.

Message-based power control is slower than bit-current power control. Consequently, a member subscriber station requires faster power control, for example, due to the worsening of the link condition and consequently of the received signal, the member subscriber station can use a message carried on the R -ACH, REACH, or control channels, eg R-CCCH, to request the assignment of a reverse pilot channel R-PCH and R-PCSCH. Alternatively, the base station may determine that a particular member subscriber station consistently requires adjustment in the transmission power level. The base station then assigns the particular member subscriber station the R-PCH and R-PCSCH. Furthermore, the R-PCH / R-PCSCH can be controlled by gate. The term "composite control" as used herein means the activation of R-PCH / R-PCSCH transmission only in predetermined power control groups (PCG). If the link condition deteriorates further, the subscriber station may request, or receive assigned an R-DCCH, R-FCH, or a combination.

If there are no individually assigned F-DCCHs, (eg Group II or Group III in Table 1), all bits carried on the R-PCSCH are used for forward link shared channel power control. In one embodiment, the PC bits that correspond to a frame are grouped to send a single EIB. In another embodiment, some bits in frame time are pooled to send an EIB while the others carry a detailed amount of the S / (N + I) deficit or surplus detected by the member MS.

Dedicated Direct Link Channel

As analyzed in the co-pending application with serial number XX / XXX, XXX, entitled METHOD AND APPARATUS FOR MANAGING MULTIPLE SERVICES FROM POINT TO POINT IN A COMMUNICATIONS SYSTEM, filed on March 28, 2002, the shared direct link channel was modulates by traffic information, signaling messages necessary to maintain the call, (for example, a pilot intensity measurement message, transfer direction message, handover completion message and other messages known to those skilled in the art), and messages related to the group call (for example, the start and end of a call, the request and guarantee of a right to transmit 5 and other messages known to one of ordinary skill in the art). Because F-SCH (s) is a common channel, a common channel must be employed, addressing information from the appropriate subscriber station, so that the subscriber station 10 can discern the common information from the information directed towards the station. subscriber. Since the signaling messages and the subscriber station header that give direction negatively affect the traffic capacity, alternatively, the forward link shared channel is modulated only by the traffic information and the messages of signaling is carried over an additional forward link channel. The additional forward link channel 20 is a dedicated channel that is assigned to each individual member subscriber station.

Because the dedicated forward link channels are assigned individually to each member subscriber station, the transmission power level of the dedicated channels can be controlled through methods applicable to point-to-point communication. In this way, the subscriber station determines the quality metric of the dedicated forward link channel, reports it to a base station, and the base station adjusts the energy level of the dedicated forward link channel.

The base station can use the determined transmission energy level of the dedicated forward link channel to determine a transmission energy level of the forward link shared channel by retransmission or appropriate rate of information transmitted on the forward link shared channel and the dedicated forward link channel for each member subscriber station. The base station then adjusts the forward link shared channel transmission power level to meet the subscriber station with the highest power requirement.

Because the dedicated forward link channel is modulated by signaling and header information, insufficient activity may fit on the forward link channel to ensure sufficient accuracy of determining the transmission energy level of the forward link channel. dedicated via speed relay accordingly, the base station monitors activity on both the shared forward link channel and the dedicated forward link channel and sends live-alive frames on the dedicated forward link channel to ensure sufficient activity for rate retransmission accuracy .

Those skilled in the art will recognize that although various modalities described in terms of flow charts and methods, as performed 15 solely for pedagogical purposes. The methods can be performed via apparatus, in which one embodiment comprises a processor that interfaces with a transmitter, a receiver and other suitable AT and / or AP blocks.

Those skilled in the art will understand that information and signals can be represented using a variety of various technologies and techniques. For example, data, command, information, signal, bit, symbol, and chip instructions that may be referenced through the above description may be represented through voltages, currents, electromagnetic waves, magnetic fields, or particles, optical fields or particles or any combination thereof.

Those skilled in the art will further appreciate that the various illustrative logic algorithm blocks, modules, circuits, and steps described in conjunction with the embodiments described herein may be implemented as electronic hardware, computer software, or combinations of both. To more clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described in the preceding paragraphs generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the particular application and the design constraints that are imposed on the overall system. Those skilled in the art can implement the described functionality in various ways for each particular application, but such implementation decisions should not be construed as separate from the scope of the present invention.

The various illustrative logic blocks, modules, and circuits described in conjunction with the embodiments described herein may be implemented or performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a grid. programmable communications bridge (FPGA) or other programmable logic devices, a discrete communications bridge or logic transistor, discrete hardware components or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but alternatively, the processor can be any conventional processor, controller, microcontroller or static machine. A processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors together with a core DSP or any other similar configuration.

The steps of a method or algorithm described in connection with the modalities described herein can be modeled directly in the hardware, in a software module executed by a processor, or in a combination of both, a software module can receive in the RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard drives, removable drives, a CD-ROM, or any other forms of storage medium known in the art. A storage medium is coupled to the processor so that the processor can read information from the processor and write information to the storage medium.

Alternatively, the storage medium can be integral to the processor. The processor and the storage medium can receive in an ASIC. The ASIC can reside in a user terminal. In an alternative, the processor and the storage medium can reside as discrete components in a user terminal.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art and the generic principles defined herein can be applied to other embodiments without departing from the spirit and scope of the invention. Thus, the present invention was not created to be limited to modalities. described herein, but the broadest scope consistent with the principles 10 and novel features described herein should be conferred.

A portion of the description in this patent document contains material, which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction of any of the patent document or the patent description, as it appears in the patent file of the 20 Registered and Patent Office or in its records. Otherwise, all copyrights are reserved.

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27997001	United States of America	P	2001-03-28
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US2002141365A1	United States of America	A1	2002-10-03
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Power control for point-to-multipoint services provided in communication systems.

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