ES2453448A2 - Determinación de tamaño de libro de códigos de HARQ/ACK - Google Patents

Determinación de tamaño de libro de códigos de HARQ/ACK Download PDF

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Publication number
ES2453448A2
ES2453448A2 ES201330358A ES201330358A ES2453448A2 ES 2453448 A2 ES2453448 A2 ES 2453448A2 ES 201330358 A ES201330358 A ES 201330358A ES 201330358 A ES201330358 A ES 201330358A ES 2453448 A2 ES2453448 A2 ES 2453448A2
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Spain
Prior art keywords
harq
server
downlink
cell
ack
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Granted
Application number
ES201330358A
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English (en)
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ES2453448R1 (es
ES2453448B2 (es
Inventor
Hong He
Jong-Kae Fwu
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Apple Inc
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Intel Corp
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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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Abstract

Determinación de tamaño de libro de códigos de HARQ/ACK.#Las formas de realización de la presente descripción describen dispositivos, procedimientos, soportes legibles por ordenador y configuraciones de sistema para determinar un libro de códigos de petición de repetición automática hibrida (HARQ) y acuse de recibo (ACK) en redes de comunicación inalámbricas.

Description

Determinación de tamaño de libro de códigos de HARQ/ACK.
Campo
Las formas de realización de la presente invención se refieren, en general, al campo de las comunicaciones y, más en particular, a la determinación de tamaño de un libro de códigos de petición de repetición automática híbrida y acuse de recibo (HARQ-ACK) en redes de comunicación inalámbricas.
Antecedentes
En la Versión 8 del estándar Long-Term Evolution (LTE) del Third Generation Partnership Project (3GPP) se describe la superposición de información de control de enlace ascendente (UCI) en un canal compartido de enlace ascendente físico (PUSCH). Los recursos de indicador de calidad de canal/indicador de matriz de precodificación (CQI/PMI) se colocan al principio de los recursos de datos del canal compartido de enlace ascendente (UL-SCH) y se aplican secuencialmente a todos los símbolos de acceso múltiple por división de frecuencia de portadora única (SC-FDMA) de una subportadora antes de continuar en la siguiente subportadora. Los datos de UL-SCH se ajustan por variación alrededor de los datos de CQI/PMI. Los recursos de HARQ-ACK se aplican a los símbolos de SC-FDMA perforando los elementos de recursos de datos (REs) del PUSCH. Por lo tanto, reduciendo los REs del PUSCH perforados por los símbolos de HARQ-ACK mejoraría el rendimiento del PUSCH.
En vista de lo anterior, la Versión 8 proporciona un índice de asignación de enlace descendente de 2 bits (DAI) en
formato 0/4 de información de control de enlace descendente (DCI), , que se usa para indicar la cantidad total de asignaciones de enlace descendente (DL) en una ventana de agrupación. Suponiendo que el tamaño de la ventana de agrupación sea M, sólo es necesario realimentar a un dispositivo de transmisión , por ejemplo, una
estación base de nodo mejorado (eNB), bits de HARQ-ACK de , en lugar de bits de M, si la transmisión de PUSCH se ajusta en función de un PDCCH detectado con formato 0/4 de DCI. Por lo tanto, se reducen los bits de
HARQ-ACK inútiles de (M-), correspondientes a subtramas de DL no planificadas por la eNB.
La Versión 10 del estándar LTE (Rel-10) introduce agregación de portadoras, en la que se puede usar más de una portadora de componentes (CC) para transmisiones de datos. En un sistema de duplexación por división de tiempo (TDD) de la Versión 10, el tamaño del libro de códigos de HARQ-ACK, en caso de superposición en PUSCH, se determina por la cantidad de CCs, por su modo de transmisión configurado y por la cantidad de subtramas de enlace descendente en ventana agrupada. Respecto a las configuraciones 1 a 6 de UL-DL de TDD y cuando el formato 3 del PUCCH está configurado para transmisión de HARQ-ACK, el tamaño del libro de códigos de HARQ-ACK se determina por:
, (1)
en la que C es la cantidad de CCs configuradas, C2 es la cantidad de CCs configuradas con un modo de transmisión
de entrada múltiple, salida múltiple (MIMO) que permite la recepción de dos bloques de transporte;
es la cantidad de subtramas de enlace descendente por las que es necesario que el UE realimente bits de HARQ-ACK para la célula servidora de la cth. Respecto a la configuración 1, 2, 3, 4 y 6 de UL-DL de TDD, los UEs supondrán
que en subtrama n de PUSCH es:
, (2)
en la que
se determina por el DAI en formato 0/4 de DCI según la siguiente tabla:
DAI
MSB, LSB
0,0
1
0,1
2
1,0
3
1,1
4
Tabla 1 El DAI se puede comunicar en una subtrama que tiene una asociación predeterminada a subtrama n para cada
célula servidora. Por ejemplo, el DAI se puede comunicar en subtrama n-k’, en la que k’ se define en la siguiente tabla:
Configuración de UL/DL de TDD
Cantidad de subtramas n
0
1 2 3 4 5 6 7 8 9
1
6 4 6 4
2
4 4
3
4 4 4
4
4
4
5
4
6
7 7 5 7 7
5 Tabla 2
Dado que la configuración de UL-DL de TDD de cada célula servidora es siempre idéntica en la Rel-10 y que, sin
duda, no es mayor que el tamaño de la ventana de agrupación, el tamaño de libro de códigos de HARQ-ACK
determinado por
es siempre igual a una cantidad mínima de bits de HARQ-ACK y es la mejor relación entre 10 rendimiento y sobrecarga de HARQ-ACK.
La Versión 11 del estándar LTE del 3GPP, soporta CA interbandas de TDD con CCs que tienen configuraciones de UL-DL diferentes para cada célula servidora. El tener configuraciones de UL-DL diferentes en las distintas células servidoras puede tener como resultado ventanas de agrupación de HARQ-ACK diferentes. Por lo tanto, la
15 determinación de tamaño de libro de códigos de HARQ-ACK en función de la concesión de UL de las versiones anteriores puede no reducir de manera eficaz la sobrecarga de HARQ-ACK.
Breve descripción de los dibujos
20 Las formas de realización se entenderán fácilmente con la siguiente descripción detallada junto con los dibujos adjuntos. Para facilitar la descripción, números de referencia similares indican elementos estructurales similares. Las formas de realización se ilustran a modo de ejemplo y no a modo de limitación en las figuras de los dibujos adjuntos.
La Figura 1 ilustra esquemáticamente una red de comunicación inalámbrica según varias formas de realización.
25 La Figura 2 ilustra una estructura de comunicación de TDD de ejemplo con información de tiempos de HARQ-ACK según varias formas de realización.
La Figura 3 es un diagrama de flujo que ilustra un procedimiento de determinación de un tamaño de libro de códigos 30 de HARQ-ACK que se puede llevar a cabo con un equipo de usuario según varias formas de realización.
La Figura 4 es una tabla de generación de bits de HARQ-ACK según algunas formas de realización.
La Figura 5 representa esquemáticamente un sistema de ejemplo según varias formas de realización. 35
Descripción detallada
Las formas de realización ilustrativas de la presente descripción incluyen procedimientos, sistemas, soportes legibles por ordenador y aparatos para determinar un tamaño de un libro de códigos de HARQ-ACK en redes de 40 comunicación inalámbricas, si bien no se limitan a los mismos. Varias formas de realización pueden proporcionar un equipo de usuario (UE) que funciona conforme a la Versión 11 del LTE del 3GPP (en adelante, “Rel-11”) (y versiones posteriores) con la capacidad de determinar el tamaño de libro de códigos de HARQ-ACK en PUSCH de tal manera que se reduce la sobrecarga de HARQ-ACK a la vez que se mantiene el rendimiento de HARQ-ACK para CA interbandas de CCs de TDD con diferentes configuraciones de UL-DL para distintas células servidoras. De este
45 modo los UEs que se describen pueden determinar por adaptación el tamaño de libro de códigos de HARQ-ACK deseado para perforar los REs del PUSCH que reducirán el impacto negativo en el PUSCH con poca o sin sobrecarga adicional.
Se pueden describir varias formas de realización en relación con configuraciones específicas, por ejemplo,
50 configuraciones de UL-DL de TDD y configuraciones de subtramas especiales; con formatos, por ejemplo, formatos de DCI; con modos, por ejemplo, modos de transmisión, etc. Dichas configuraciones, formatos modos, etc. se pueden definir con arreglo a los documentos de LTE actualmente publicados, por ejemplo, especificaciones técnicas de la Rel-10 y/o la Rel-11.
55 Se describirán varios aspectos de las formas de realización ilustrativas usando términos que normalmente utilizan los expertos en la materia para transmitir la esencia de su trabajo a otros expertos en la materia. No obstante, resultará evidente para los expertos en la materia que se pueden poner en práctica formas de realización alternativas con sólo algunos de los aspectos que se describen. A efectos de explicación, se establecen cantidades, materiales y configuraciones específicos a fin de proporcionar un total entendimiento de las formas de realización ilustrativas. No obstante, para un experto en la materia resultará evidente que se pueden poner en práctica formas de realización alternativas sin los detalles específicos. En otros casos, se omiten o simplifican características muy conocidas a fin de no complicar las formas de realización ilustrativas.
Además, se describirán varias operaciones como operaciones múltiples diferenciadas, a su vez, de un modo que es muy útil para entender las formas de realización ilustrativas. No obstante, el orden de descripción no se debería interpretar que implica que dichas operaciones dependen necesariamente del orden. En particular, no es necesario llevar a cabo dichas operaciones en el orden de presentación.
La expresión “en algunas formas de realización” se usa reiteradamente. Por lo general, la expresión no se refiere a las mismas formas de realización, aunque se puede referir a las mismas formas de realización, por ejemplo, cuando
las características se pueden combinar. Los términos “que comprende”, “que tiene” y “que incluye” son sinónimos, a menos que del contexto se desprenda lo contrario. La expresión “A y/o B” significa (A), (B) o (A y B). La expresión “A/B” significa (A), (B) o (A y B), al igual que la expresión “A y/o B”. La expresión “al menos uno de A, B y C” significa (A), (B), (C), (A y B), (A y C), (B y C) o (A, B y C). La expresión “(A) B” significa (B) o (A y B), es decir, A es opcional.
Si bien en este documento se ilustran y se describen formas de realización específicas, alguien con conocimientos básicos sobre la materia entenderá que las formas de realización específicas que se muestran y se describen se pueden sustituir por una gran variedad de implementaciones alternativas y/o equivalentes sin apartarse del alcance de las formas de realización de la presente descripción. La presente solicitud pretender cubrir cualquier adaptación o variación de las formas de realización que se analizan en este documento. Por lo tanto, se pretende manifiestamente que las formas de realización de la presente descripción se limiten únicamente por medio de las reivindicaciones y de los equivalentes de las mismas.
Según se usa en este documento, el término “módulo” se puede referir a un Circuito Integrado de Aplicación
Específica (ASIC), a un circuito electrónico, a un procesador (compartido, dedicado o de grupo) y/o memoria (compartida, dedicada o de grupo), a un circuito de lógica combinatoria o a otro circuito electrónico que proporcione la funcionalidad que se describe, puede formar parte de los mismos o incluir éstos. En varias formas de realización, el módulo puede ejecutar instrucciones almacenadas en uno o mas soportes legibles por ordenador para proporcionar la funcionalidad que se describe.
La Figura 1 ilustra esquemáticamente una red de comunicación inalámbrica 100 según varias formas de realización.
La red de comunicación inalámbrica 100 (en adelante, “red 100”) puede ser una red de acceso de una red conforme
al LTE del 3GPP, tal como una red universal de acceso radio terrestre evolucionada (E-UTRAN). La red 100 puede incluir una estación base, por ejemplo, una estación base de nodo mejorado (eNB) 104, configurada para comunicación inalámbrica con un equipo de usuario (UE) 108.
Como se muestra en la Figura 1, el UE 108 puede incluir un controlador de realimentación 112 acoplado con un módulo transceptor 116. El módulo transceptor 116 puede estar además acoplado con una o más de una pluralidad de antenas 132 del UE 108 para comunicación inalámbrica con otros componentes de la red 100, por ejemplo, la eNB 104.
En algunas formas de realización, el UE 108 puede ser capaz de utilizar agregación de portadoras (CA) en la que una cantidad de portadoras de componentes (CCs) se agrega para comunicación entre la eNB 104 y el UE 108. El módulo transceptor 116 puede estar configurado para comunicación con la eNB 104 a través de una pluralidad de células servidoras que utilizan una pluralidad respectiva de CCs. Las CCs pueden estar dispuestas en diferentes bandas y pueden estar asociadas a configuraciones de UL-DL de TDD diferentes (en adelante, también denominadas “configuraciones de UL-DL”). Por consiguiente, en algunas formas de realización, al menos dos células servidoras pueden tener configuraciones de UL-DL diferentes.
La Tabla 3 siguiente muestra configuraciones de UL-DL de ejemplo que se pueden utilizar en varias formas de realización de la presente invención.
Configuración de UL-DL de TDD
Cantidad de subtramas
0
1 2 3 4 5 6 7 8 9
0
D S U U U D S U U U
1
D S U U D D S U U D
2
D S U D D D S U D D
3
D S U U U D D D D D
4
D S U U D D D D D D
5
D S U D D D D D D D
6
D S U U U D S U U D
Tabla 3
En la Tabla 3, D es una subtrama para una transmisión de enlace descendente, U es una subtrama para una transmisión de enlace ascendente y S es una subtrama especial que se usa, por ejemplo, para un tiempo de guarda. En algunas formas de realización, una subtrama especial puede incluir tres campos: intervalo de tiempo piloto de enlace descendente (DwPTS), que puede incluir la DCI, período de guarda (GP) e intervalo de tiempo piloto de enlace ascendente (UpPTS).
En un establecimiento de conexión inicial, el UE 108 puede conectar con una célula servidora principal (PCell) de la eNB 104 utilizando una CC principal, que también se puede denominar CC0. Esta conexión se puede usar para varias funciones, tales como seguridad, movilidad, configuración, etc. Posteriormente, el UE 108 puede conectar con una o más células servidoras secundarias (SCells) de la eNB 104 utilizando una o más CCs secundarias. Estas conexiones se pueden usar para proporcionar recursos de radio adicionales.
La Figura 2 ilustra una estructura de comunicación de TDD de ejemplo 200 con información de tiempos de HARQ-ACK según una forma de realización. En la estructura de comunicación de TDD 200, tres células servidoras pueden estar configuradas para comunicación entre la eNB 104 y el UE 108. Por ejemplo, una PCell que tiene la configuración 0 de UL-DL, una SCell 1 que tiene la configuración 2 de UL-DL y una SCell 2 que tiene la configuración 1 de UL-DL. En otras formas de realización, otras cantidades de células servidoras pueden estar configuradas para comunicación entre la eNB 104 y el UE 108.
En la estructura de comunicación de TDD 200, la PCell puede tener una ventana de agrupación, M0, que incluye una subtrama que puede incluir transmisiones de enlace descendente, por ejemplo, transmisiones de PDSCH o transmisiones de PDCCH, que indican liberación de la planificación semipersistente de enlace descendente (SPS), para las que se va a transmitir información de HARQ-ACK correspondiente como una transmisión de PUSCH en una subtrama de enlace ascendente asociada, por ejemplo, subtrama 7 de la SCell 1. La SCell 1 puede tener una ventana de agrupación, M1, que incluye cuatro subtramas que pueden incluir transmisiones de enlace descendente para las que se va a transmitir información de HARQ-ACK correspondiente como una transmisión de PUSCH en una subtrama de enlace ascendente asociada, por ejemplo, subtrama 7 de la SCell 1. La SCell 2 puede tener una ventana de agrupación, M2, que incluye dos subtramas que pueden incluir transmisiones de enlace descendente para las que se va a transmitir información de HARQ-ACK correspondiente como una transmisión de PUSCH en una subtrama de enlace ascendente asociada, por ejemplo, subtrama 7 de la SCell 1. La asociación entre las subtramas de DL de las respectivas ventanas de agrupación y la subtrama de UL que se usará para transmitir la información de HARQ-ACK correspondiente se puede basar en una referencia de tiempos de HARQ predeterminada. Un ejemplo de dichas referencias de tiempos de HARQ se muestra y se analiza a continuación en relación con la Tabla 4.
En el ejemplo que se muestra en la Figura 2, todas las subtramas capaces de llevar transmisiones de enlace descendente para las que se va a transmitir información de HARQ-ACK se muestran como si tuvieran transmisiones de PDSCH. No obstante, en otras formas de realización, la eNB puede no planificar transmisiones de enlace descendente en una o más de dichas subtramas.
La Figura 3 ilustra un procedimiento 300 de determinación de un tamaño de libro de códigos de HARQ-ACK según algunas formas de realización. El procedimiento 300 se puede llevar a cabo por medio de un controlador de realimentación de un UE, por ejemplo, el controlador de realimentación 112 del UE 108. En algunas formas de realización, el UE puede incluir y/o tener acceso a uno o más soportes legibles por ordenador que tienen instrucciones almacenadas en los mismos que, cuando se ejecutan, hacen que el UE o el controlador de realimentación lleven a cabo el procedimiento 300.
En la etapa 304, el controlador de realimentación puede determinar los tiempos de HARQ-ACK y la ventana de agrupación para cada célula servidora configurada. En algunas formas de realización, el controlador de realimentación puede determinar, para cada célula servidora configurada, una cantidad total de subtramas dentro de una ventana de agrupación que está asociada a una subtrama de enlace ascendente. En general, la ventana de agrupación de HARQ-ACK puede incluir tanto subtramas de enlace descendente como subtramas especiales, dado que ambas son capaces de llevar transmisiones de PDSCH. No obstante, en algunas formas de realización, determinadas subtramas especiales se pueden excluir de la ventana de agrupación a fin de reducir el tamaño de libro de códigos de HARQ-ACK. Por ejemplo, subtramas especiales de las configuraciones 0 y 5 con prefijo cíclico (CP) de enlace descendente normal o de las configuraciones 0 y 4 con CP de enlace descendente ampliado se pueden excluir de la ventana de agrupación ya que normalmente no llevan transmisiones de PDSCH. Las
5 configuraciones de subtramas especiales se pueden definir con arreglo a la Tabla 4.2-1 de las Especificaciones Técnicas (TS) del 3GPP 36.211 V10.5.0 (2012-06).
En algunas formas de realización, los tiempos de HARQ-ACK y las ventanas de agrupación, Mc, se pueden determinar según un índice de conjunto de asociación de enlace descendente predeterminado K: {k0, k1, … kM-1}
10 para TDD, como se ilustra en las configuraciones de UL-DL para referencia de tiempos de HARQ de la Tabla 4.
Configuración de UL-DL
Subtrama n
0
1 2 3 4 5 6 7 8 9
0
- - 6 - 4 - - 6 - 4
1
- - 7, 6 4 - - - 7, 6 4 -
2
- - 8, 7, 4, 6 - - - - 8, 7, 4, 6 - -
3
- - 7, 6, 11 6, 5 5, 4 - - - - -
4
- - 12, 8, 7, 11 6, 5, 4, 7 - - - - - -
5
- - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - -
6
- - 7 7 5 - - 7 7 -
Tabla 4
15 En varias formas de realización, cada célula servidora puede tener una referencia de tiempos de HARQ que es igual
o diferente a la configuración de UL-DL de la célula servidora. La configuración de UL-DL de la célula servidora se comunica en el Bloque de Información de Sistema (SIB) 1 de la célula servidora y, por lo tanto, se puede denominar también configuración de SIB1 de la célula servidora. La referencia de tiempos de HARQ de una PCell puede ser igual que la configuración de SIB1 de la PCell, mientras que la referencia de tiempos de HARQ de una SCell se
20 puede seleccionar teniendo en cuenta tanto la configuración de SIB1 de la SCell como la configuración de SIB1 de la PCell según la Tabla 5.
Configuración de UL-DL para referencia de tiempos de HARQ
Configuración de UL-DL de SIB1 de la SCell
0
1 2 3 4 5 6
Configuración de UL-DL de SIB1 de la PCell
0 0 1 2 3 4 5 6
1
1
1
2 4 4 5
1
2
2
2
2
5 5 5
2
3
3
4 5 3 4 5
3
4
4
4
5 4 4 5
4
5
5
5
5
5
5
5
5
6
6
1 2 3 4 5
6
Tabla 5
25 Según la Tabla 5 y en relación con la Figura 2, la PCell usará la configuración 0 de UL-DL para su referencia de tiempos de HARQ, la SCell 1 usará la configuración 2 de UL-DL para su referencia de tiempos de HARQ y la SCell 2 usará la configuración 1 de UL-DL para su referencia de tiempos de HARQ. Si bien esta forma de realización ilustra ambas SCells usando sus configuraciones de SIB1 para la referencia de tiempos de HARQ, una SCell puede usar
30 otras configuraciones de UL-DL para su referencia de tiempos de HARQ en otras formas de realización. Por ejemplo, si la SCell 1 tuviera una configuración de SIB1 de 3 y la PCell tuviera una configuración de SIB1 de 1, la SCell usaría la configuración 4 de UL-DL para su referencia de tiempos de HARQ.
Para ilustrar adicionalmente el uso de las Tablas 4 y 5, téngase en cuenta lo siguiente. Designando la subtrama 7 35 (por ejemplo, n =7) de la SCell 1 como subtrama de enlace ascendente para transmitir información de HARQ-ACK, las subtramas de enlace descendentes asociadas se pueden determinar por medio de n-k, en la que k
K. El tamaño de la ventana de agrupación, Mc, es la cardinalidad del conjunto K de elementos y las subtramas específicas de la ventana de agrupación se determinan por medio de n-k0…n-kM-1. Por lo tanto, el tamaño de la ventana de agrupación de la PCell, M0, es 1 (dado que sólo un elemento está asociado a la configuración 0 de UL-DL, subtrama
40 n = 7 en la Tabla 4) y la subtrama de enlace descendente de M0 es 7 – 6 = 1, por ejemplo, subtrama 1 de DL. El tamaño de la ventana de agrupación de SCell 1, M1, es 4 (dados cuatro elementos de la Tabla 4) y las subtramas de DL de M1 son subtrama 3 (7-4), subtrama 1 (7-6), subtrama 0 (7-7) y subtrama 9 de la trama anterior (7-8). El tamaño de la ventana de agrupación de SCell 2, M2, es 2 (dados dos elementos de la Tabla 4) y las subtramas de DL de M2 son subtrama 0 (7-7) y subtrama 1 (7-6).
En la etapa 308, el controlador de realimentación puede determinar un DAI. El DAI se puede comunicar en una subtrama que tiene una asociación predeterminada a la subtrama de enlace ascendente, n, que llevará la información de HARQ-ACK para las ventanas de agrupación, por ejemplo, subtrama 7 en la SCell 1. En algunas formas de realización, el DAI se puede comunicar en subtrama n-k’, en la que k’ se define en la Tabla 2. En algunas
formas de realización, el DAI se puede usar para determinar según la Tabla 1. El
puede corresponder a un valor máximo de la cantidad de subtramas de enlace descendente planificada dentro de ventanas de
agrupación de la pluralidad de células servidoras. En relación con la Figura 2,
= 4, porque 4 subtramas de enlace descendente están planificadas en SCell 1.
En la etapa 312, el controlador de realimentación puede determinar una cantidad de bits de HARQ-ACK, que corresponde a las células servidoras configuradas, en un PUSCH de la subtrama de enlace ascendente. En algunas formas de realización, el controlador de realimentación puede determinar la cantidad de bits de HARQ-ACK, para
cada célula servidora, en función del , que se basa en el DAI para una asignación de recursos de enlace ascendente, y la cantidad de subtramas de la ventana de agrupación de la célula servidora correspondiente según la configuración de la referencia de tiempos de HARQ.
En algunas formas de realización, la cantidad de bits de HARQ-ACK para la célula servidora de la cth , Oc, se puede determinar por medio de la siguiente ecuación.
Ecuación 1
en la que U es un valor máximo de Uc entre todas las células servidoras configuradas, Uc es la cantidad total de subtramas con transmisiones recibidas (por ejemplo, PDSCHs y PDCCHs, que indican liberación de la SPS de enlace descendente) en la ventana de agrupación (por ejemplo, subtrama(s) n-k en la que kK, como se ha
descrito en relación con la Tabla 4) de la célula servidora de la cth ,
se determina por medio del DAI incluido en la DCI, que puede tener formato 0 ó 4, que asigna el recurso de transmisión de enlace ascendente de la célula servidora en el que la UCI se superpone en el PUSCH (por ejemplo, SCell 1) según la Tabla 1 en subtrama n-k’, en
la que k’ se define en la Tabla 2; = 1 si el modo de transmisión configurado en la célula servidora de la cth
soporta un bloque de transporte y, si no, = 2 y Min(X, Y) = X si X≤Y y, si no, Min(X, Y) = Y.
En formas de realización en las que ninguna de la pluralidad de células servidoras agregadas incluye una
a:
Ecuación 2
Por consiguiente, en algunas formas de realización, se usará la Ecuación 2 para transmisión de HARQ-ACK en una
subtrama n de UL y en el PUSCH ajustado por su concesión de UL asociada a
si ninguna de las configuraciones de la referencia de tiempos de HARQ de las células servidoras agregadas es la configuración 5 y se usará la Ecuación 1 para transmisión de HARQ-ACK en una subtrama n de UL y en el PUSCH ajustado por su
concesión de UL asociada a
si la configuración de la referencia de tiempos de HARQ de cualquiera de las células servidoras agregadas es la configuración 5.
Cabe señalar que, en algunas formas de realización, no se puede usar la Ecuación 1 ni la 2 en situaciones en las que la célula servidora que lleva a cabo la planificación de PUSCH (por ejemplo, SCell 1 en la Figura 2) tiene una configuración 0 de SIB1. En dichas formas de realización, la eNB puede no ser capaz de transmitir DAI en formato 0/4 de DCI y, por lo tanto, el UE no podrá determinar W.
Los bits de realimentación de HARQ-ACK
para la célula servidora de la cth se construyen como sigue, en la que c≥0: la HARQ-ACK, para una transmisión de PDSCH asociada a un mensaje de DCI de un PDDCH o una transmisión de PDCCH, que indica liberación de la SPS de enlace descendente en la subtrama n-k, está asociada a
si el modo de transmisión configurado en la célula servidora de la cth
soporta un bloque de transporte o asociada a
y, si no, a , en la que DAI(k) es el valor de DAI, para asignación de recursos de subtrama de enlace descendente, en formato 1A/1B/1D/1/2/2A/2B/2C de DCI detectado en subtrama n-k dependiendo de la ventana de agrupación de la célula servidora de la cth. Los bits de realimentación de HARQ-ACK sin ninguna transmisión de PDSCH detectada o sin PDCCH detectado, que indique liberación de la SPS de enlace descendente, se pueden establecer en NACK.
A continuación se proporciona un ejemplo, en relación con la Figura 2 y suponiendo que está configurado el modo de transmisión 4 con dos bloques de transporte habilitados. La configuración de la subtrama especial de cada CC es la configuración 3 con prefijo cíclico (CP) de enlace descendente normal. Como se ha indicado anteriormente, la eNB, en este ejemplo, puede transmitir en cada oportunidad dentro de las ventanas de agrupación designadas, por ejemplo, subtrama 1 de PCell, subtramas 9, 0, 1 y 3 de SCell 1 y subtramas 0 y 1 de SCell 2. Además, el UE puede recibir, en subtrama 3 de la SCell 1, la concesión de enlace ascendente para la transmisión de PUSCH en subtrama 7 de la SCell 1. Dado que el valor máximo de la cantidad total de las subtramas planificadas de PDSCH dentro de
las ventanas de agrupación es 4 según los supuestos actuales, el
de la concesión de enlace ascendente para subtrama 7 se establecerá como 4 por medio de la eNB. Según la Ecuación 1, el valor de O0 de los bits de HARQ-ACK para PCell se puede calcular como sigue:
Del mismo modo, los bits de HARQ-ACK para SCell 1 y SCell 2 se pueden determinar como O1 = 8 y O2 = 4, respectivamente. Esto se muestra, gráficamente, en la tabla de generación de bits de HARQ-ACK 400 de la Figura 4 según algunas formas de realización. Si los bits de HARQ-ACK se determinaran según la metodología de la Rel-10, los resultados serían O0 = 8,O1 = 8 y O2 = 8.
En la etapa 316, el controlador de realimentación puede determinar el tamaño de libro de códigos de HARQ-ACK en el PUSCH de la subtrama de enlace ascendente. La determinación del tamaño de libro de códigos de HARQ-ACK se puede realizar agregando la cantidad de bits de HARQ-ACK que corresponde a cada una de la pluralidad de células servidoras según la siguiente ecuación:
Ecuación 2
En el ejemplo que se ha analizado anteriormente, O = 14. En la metodología de la Rel-10, O = 24. Por consiguiente, las formas de realización que se han descrito tienen como resultado una reducción del 42% de la sobrecarga de HARQ-ACK. De este modo, el rendimiento del PUSCH y el rendimiento del sistema se pueden mejorar sin que afecte al rendimiento de HARQ-ACK.
El UE 108 que se describe en este documento se puede implementar en un sistema usando cualquier hardware y/o software adecuado para configurarlo según se desee. La Figura 5 ilustra, para una forma de realización, un sistema de ejemplo 500 que comprende uno o más procesadores 504, lógica de control de sistema 508 acoplada con al menos uno de los procesadores 504, memoria de sistema 512 acoplada con lógica de control de sistema 508, dispositivo de almacenamiento/memoria no volátil (NVM) 516 acoplado con lógica de control de sistema 508, una interfaz de red 520 acoplada con lógica de control de sistema 508 y dispositivos de entrada/salida (I/O) 532 acoplados con lógica de control de sistema 508.
Los procesadores 504 pueden incluir uno o más procesadores de núcleo único o núcleo múltiple. Los procesadores 504 pueden incluir cualquier combinación de procesadores de uso general y procesadores dedicados (por ejemplo, procesadores gráficos, procesadores de aplicaciones, procesadores de banda base, etc).
La lógica de control de sistema 508, para una forma de realización, puede incluir cualquier controlador de interfaz adecuada para proveer cualquier interfaz adecuada al menos a uno de los procesadores 504 y/o a cualquier componente o dispositivo adecuado en comunicación con lógica de control de sistema 508.
La lógica de control de sistema 508, para una forma de realización, puede incluir uno o más controladores de memoria para proporcionar una interfaz a la memoria de sistema 512. La memoria de sistema 512 se puede usar para cargar y almacenar datos y/o instrucciones para el sistema 500. En algunas formas de realización, la memoria de sistema 512 puede incluir lógica de HARQ 524 que, cuando se ejecuta, hace que un controlador de realimentación lleve a cabo las distintas operaciones que se han descrito en este documento. La memoria de sistema 512, para una forma de realización, puede incluir cualquier memoria volátil adecuada, tal como, por ejemplo, una memoria dinámica de acceso aleatorio (DRAM) adecuada.
El dispositivo de almacenamiento/NVM 516 puede incluir uno o más soportes legibles por ordenador no transitorios y tangibles que se usan para almacenar datos y/o instrucciones, por ejemplo, lógica de HARQ 524. El dispositivo de almacenamiento/NVM 516 puede incluir cualquier memoria no volátil adecuada, tal como, por ejemplo, memoria flash y/o puede incluir cualquier dispositivo de almacenamiento no volátil adecuado, tal como una o más unidades de disco duro (HDDs), una o más unidades de disco compacto (CD) y/o una o más unidades de disco versátil digital (DVD).
El dispositivo de almacenamiento/NVM 516 puede incluir un recurso de almacenamiento físicamente parte de un dispositivo en el que está instalado el sistema 500 o mediante el que se puede acceder al mismo, pero no necesariamente una parte del dispositivo. Por ejemplo, se puede acceder al dispositivo de almacenamiento/NVM 516 sobre una red a través de la interfaz de red 520 y/o sobre dispositivos de Entrada/Salida (I/O) 532.
La interfaz de red 520 puede tener un módulo transceptor 522, similar al módulo transceptor 116, para proveer de una interfaz de radio al sistema 500 para comunicación sobre una o más redes y/o con cualquier otro dispositivo adecuado. En varias formas de realización, el módulo transceptor 522 puede estar integrado con otros componentes del sistema 500. Por ejemplo, el módulo transceptor 522 puede incluir un procesador de los procesadores 504, la memoria de la memoria de sistema 512 y el dispositivo de almacenamiento/NVM del dispositivo de almacenamiento/NVM 516. La interfaz de red 520 puede incluir cualquier hardware y/o software inalterable adecuado. La interfaz de red 520 puede incluir una pluralidad de antenas para proporcionar una interfaz de radio de múltiples entradas, múltiples salidas. La interfaz de red 520, para una forma de realización, puede incluir, por ejemplo, un adaptador de red de cable, un adaptador de red inalámbrica, un módem telefónico y/o un módem inalámbrico.
Para una forma de realización, al menos uno de los procesadores 504 puede estar provisto de lógica para uno o más controladores de lógica de control de sistema 508. Para una forma de realización, al menos uno de los procesadores 504 puede estar provisto de lógica para uno o más controladores de lógica de control de sistema 508 para formar un Sistema en Paquete (SiP). Para una forma de realización, al menos uno de los procesadores 504 puede estar integrado en el mismo molde con lógica para uno o más controladores de lógica de control de sistema
508. Para una forma de realización, al menos uno de los procesadores 504 puede estar integrado en el mismo molde con lógica para uno o más controladores de lógica de control de sistema 508 para formar un Sistema en Chip (SoC).
En varias formas de realización, los dispositivos de I/O 532 pueden incluir interfaces de usuario diseñadas para permitir la interacción del usuario con el sistema 500, interfaces de componentes periféricos diseñadas para permitir la interacción de los componentes periféricos con el sistema 500 y/o sensores diseñados para determinar las condiciones ambientales y/o información de posición relacionada con el sistema 500.
En varias formas de realización, las interfaces de usuario podrían incluir, entre otros, un visualizador (por ejemplo, un visualizador de cristal líquido, una pantalla táctil, etc.), un altavoz, un micrófono, una o más cámaras (por ejemplo, una camara fotográfica y/o una cámara de video), una lámpara (por ejemplo, una lámpara de diodos) y un teclado.
En varias formas de realización, las interfaces de componentes periféricos pueden incluir, entre otros, un puerto de memoria no volátil, un puerto de bus serial universal (USB), un conector de audio y una interfaz de suministro de energía.
En varias formas de realización, los sensores pueden incluir, entre otros, un sensor giroscópico, un acelerómetro, un sensor de proximidad, un sensor de luz ambiente y una unidad de posicionamiento. La unidad de posicionamiento puede, asimismo, formar parte de la interfaz de red 520, o interactuar con la misma, para comunicación con componentes de una red de posicionamiento, por ejemplo, un satélite de sistema de posicionamiento global (GPS).
En varias formas de realización, el sistema 500 puede ser una eNB o un ordenador móvil tal como, entre otros, un ordenador portátil, una tableta, un netbook, un smartphone, etc. En varias formas de realización, el sistema 500 puede tener más o menos componentes y/o arquitecturas diferentes.
Si bien, a efectos de descripción, en este documento se han ilustrado y se han descrito determinadas formas de realización, las formas de realización, que se han mostrado y se han descrito, se pueden sustituir por una gran variedad de formas de realización o implementaciones alternativas y/o equivalentes pensadas para lograr los mismos objetivos sin apartarse del alcance de la presente descripción. La presente solicitud pretender cubrir cualquier adaptación o variación de las formas de realización que se analizan en este documento. Por lo tanto, se pretende manifiestamente que las formas de realización, que se describen en este documento, se limiten únicamente por medio de las reivindicaciones y de los equivalentes de las mismas.

Claims (26)

  1. REIVINDICACIONES
    1. Un aparato que comprende:
    un módulo transceptor configurado para comunicarse a través de una pluralidad de células servidoras, en el que al menos dos de las células servidoras tienen configuraciones de enlace ascendente-enlace descendente (UL-DL) de duplexación por división de tiempo (TDD) diferentes; y
    un controlador de realimentación acoplado con el módulo transceptor y configurado para:
    recibir, a través del módulo transceptor, un índice de asignación de enlace descendente (DAI);
    determinar una cantidad de subtramas de enlace descendente dentro de una ventana de agrupación de una primera célula servidora de la pluralidad de células servidoras, en la que las subtramas de enlace descendente de la ventana de agrupación están asociadas a una subtrama de enlace ascendente para la transmisión de información de petición de repetición automática híbrida y acuse de recibo (HARQ-ACK) correspondiente y
    determinar una cantidad de bits de HARQ-ACK, que corresponde a la primera célula servidora, disponible en una canal compartido de enlace ascendente físico (PUSCH) de la subtrama de enlace ascendente en función del DAI y de la cantidad determinada de subtramas de enlace descendente.
  2. 2.
    El aparato de la reivindicación 1, en el que el DAI corresponde a un valor máximo de una cantidad de subtramas de enlace descendente planificadas dentro de ventanas de agrupación de la pluralidad de células servidoras, en el que las subtramas de enlace descendente dentro de las ventanas de agrupación de la pluralidad de células servidoras están asociadas a la subtrama de enlace ascendente y el controlador de realimentación está configurado además para:
    determinar los bits de HARQ-ACK en función del valor máximo.
  3. 3.
    El aparato de la reivindicación 1, en el que el DAI está incluido en información de control de enlace descendente (DCI) que asigna un recurso de transmisión de enlace ascendente de una célula servidora que tiene la subtrama ascendente.
  4. 4.
    El aparato de la reivindicación 3, en el que la DCI tiene un formato que es formato 0 de DCI o formato 4 de DCI.
  5. 5.
    El aparato de la reivindicación 1, en el que al menos una de las subtramas dentro de la ventana de agrupación incluye una transmisión de canal compartido de enlace descendente físico (PDSCH) asociada a un mensaje de información de control de enlace descendente (DCI) de un canal de control de enlace descendente físico (PDCCH) o una transmisión de PDCCH que indica una liberación de la planificación semipersistente de enlace descendente (SPS) a un equipo de usuario (UE) al que corresponde la información de HARQ-ACK.
  6. 6.
    El aparato de la reivindicación 1, en el que
    la cantidad de subtramas de enlace descendente dentro de la ventana de agrupación asociada a la subtrama ascendente no incluye una subtrama especial de las configuraciones 0 y 5 con prefijo cíclico (CP) de enlace descendente normal o de las configuraciones 0 y 4 con CP de enlace descendente ampliado.
  7. 7.
    El aparato de la reivindicación 1, en el que el controlador de realimentación está configurado además para:
    determinar una cantidad de bits de HARQ-ACK que corresponde a cada una de la pluralidad de células servidoras disponible en el PUSCH de la subtrama de enlace ascendente; y
    determinar un tamaño de libro de códigos de HARQ-ACK en el PUSCH de la subtrama de enlace ascendente en función de la cantidad determinada de bits de HARQ-ACK que corresponde a cada una de la pluralidad de células servidoras.
  8. 8.
    El aparato de la reivindicación 7, en el que el controlador de realimentación está configurado para determinar el tamaño de libro de códigos de HARQ-ACK estando configurado para agregar la cantidad determinada de bits de HARQ-ACK que corresponde a cada una de la pluralidad de células servidoras.
  9. 9.
    El aparato de la reivindicación 1, en el que el controlador de realimentación está configurado además para:
    determinar un valor que corresponde al DAI; seleccionar el que sea menor entre el valor determinado o la cantidad determinada de subtramas de enlace descendente como cantidad de bits de HARQ-ACK para la primera célula servidora; y
    determinar el tamaño de libro de códigos de HARQ-ACK en el PUSCH de la subtrama ascendente en función de la cantidad de bits de HARQ-ACK para la primera célula servidora.
  10. 10. El aparato de la reivindicación 9, en el que el controlador de realimentación está configurado además para:
    determinar una cantidad de bloques de transporte soportada por subtrama para un modo de transmisión de la primera célula servidora; y
    determinar la cantidad de bits de HARQ-ACK para la primera célula servidora en función de la cantidad determinada de bloques de transporte soportada por subtrama.
  11. 11. El aparato de la reivindicación 9, en el que el controlador de realimentación está configurado además para:
    determinar una cantidad de bits de HARQ-ACK que corresponde a cada célula servidora de la pluralidad de células servidoras; y
    determinar el tamaño de libro de códigos de HARQ-ACK en función de la cantidad determinada de bits de HARQ-ACK que corresponde a cada célula servidora de la pluralidad de células servidoras.
  12. 12. El aparato de la reivindicación 11, en el que el controlador de realimentación está configurado además para determinar la cantidad de bits de HARQ-ACK que corresponde a cada célula servidora de la pluralidad de células servidoras en función de:
    en la que c es un índice de la primera célula servidora, Oc es la cantidad de bits de HARQ-ACK que corresponde a la
    célula servidora de la cth,
    es la cantidad de subtramas de enlace descendente de una ventana de agrupación de la célula servidora de la cth, en la que la ventana de agrupación se determina según una referencia de tiempos de HARQ de la célula servidora de la cth y excluye subtramas especiales de las configuraciones 0 y 5 con prefijo cíclico
    (CP) de enlace descendente normal y de las configuraciones 0 y 4 con CP de enlace descendente ampliado, es el valor determinado que corresponde al DAI en formato de DCI para asignación de recursos de enlace
    ascendente para la pluralidad de células servidoras y
    es una cantidad de bloques de transporte soportada por subtrama para un modo de transmisión de la célula servidora de la cth .
  13. 13. El aparato de la reivindicación 9, en el que el controlador de realimentación está configurado además para:
    determinar una cantidad de transmisiones de PDSCH y de transmisiones de PDCCH, que indican liberación de la planificación semipersistente (SPS) de enlace descendente, que se recibe en subtramas de ventanas de agrupación de cada una de la pluralidad de células servidoras;
    determinar un máximo de las cantidades determinadas de transmisiones de PDSCH y de transmisiones PDCCH, que indican liberación de la planificación semipersistente (SPS) de enlace descendente, que se recibe en subtramas de ventanas de agrupación de cada una de la pluralidad de células servidoras; y
    determinar la cantidad de bits de HARQ-ACK en función del máximo determinado.
  14. 14. El aparato de la reivindicación 13, en el que el controlador de realimentación está configurado además para determinar la cantidad de bits de HARQ-ACK que corresponde a cada célula servidora en función de:
    en la que c es un índice de células servidoras, Oc es la cantidad de bits de HARQ-ACK que corresponde a la célula servidora de la cth,
    es la cantidad de subtramas de enlace descendente en una ventana de agrupación de la célula servidora de la cth, en la que la ventana de agrupación se determina según una referencia de tiempos de HARQ de la célula servidora de la cth y excluye subtramas especiales de las configuraciones 0 y 5 con prefijo cíclico
    (CP) de enlace descendente normal y de las configuraciones 0 y 4 con CP de enlace descendente ampliado, es el valor que corresponde al DAI, U es el máximo determinado y
    es una cantidad de bloques de transporte soportada por subtrama para el modo de transmisión de la célula servidora de la cth .
  15. 15. El aparato de la reivindicación 14, en el que el controlador de realimentación está configurado además para determinar un tamaño de libro de códigos de HARQ-ACK, O, en función de:
    en la que
    es la pluralidad de células servidoras.
  16. 16. El aparato de la reivindicación 13, en el que el controlador de realimentación está configurado además para:
    si la configuración de la referencia de tiempos de HARQ de al menos una célula servidora de la pluralidad de células servidoras es la configuración 5 de UL-DL, determinar la cantidad de bits de HARQ-ACK que corresponde a cada célula servidora en función de:
    si ninguna de las configuraciones de la referencia de tiempos de HARQ de la pluralidad de células servidoras agregadas es la configuración 5 de UL-DL, determinar la cantidad de bits de HARQ-ACK que corresponde a cada célula servidora de la pluralidad de células servidoras en función de:
    en la que c es un índice de células servidoras, Oc es la cantidad de bits de HARQ-ACK que corresponde a la célula
    servidora de la cth, es la cantidad de subtramas de enlace descendente en la ventana de agrupación de la
    célula servidora de la cth , es el valor que corresponde al DAI en formato de DCI para asignación de recursos
    de enlace ascendente, U es el máximo determinado y
    es una cantidad de bloques de transporte soportada por subtrama para un modo de transmisión de la célula servidora de la cth .
  17. 17.
    El aparato de la reivindicación 1, en el que la subtrama de enlace ascendente está en una segunda célula servidora de la pluralidad de células servidoras.
  18. 18.
    El aparato de la reivindicación 1, en el que la cantidad de bits de HARQ-ACK corresponde a las subtramas de enlace descendente de la ventana de agrupación de la primera célula servidora.
  19. 19.
    El aparato de la reivindicación 18, en el que la asociación de las subtramas de enlace descendente de la ventana de agrupación a la subtrama de enlace ascendente se basa en una referencia de tiempos de HARQ-ACK predeterminada.
  20. 20.
    Uno o más soportes legibles por ordenador que tienen instrucciones almacenadas en los mismos que, cuando se ejecutan, hacen que un equipo de usuario (UE):
    configure una pluralidad de células servidoras para la comunicación, en la que al menos dos de las células servidoras tienen configuraciones de enlace ascendente-enlace descendente (UL-DL) de duplexación de división por tiempo (TDD) diferentes;
    determine un tamaño de una ventana de agrupación para células servidoras individuales de la pluralidad de células servidoras;
    determine un valor que corresponde a una cantidad máxima de subtramas de enlace descendente planificadas dentro de las ventanas de agrupación de la pluralidad de células servidoras; y
    determine un tamaño de un libro de códigos de HARQ-ACK en una primera subtrama de enlace ascendente que está asociada a las ventanas de agrupación de la pluralidad de células servidoras en función del tamaño de la ventana de agrupación y del valor determinado.
  21. 21. El uno o más soportes legibles por ordenador de la reivindicación 20, en los que las instrucciones, cuando se ejecutan, hacen además que el UE:
    reciba un índice de asignación de enlace descendente; y
    determine el valor en función del índice de asignación de enlace descendente.
  22. 22. El uno o más soportes legibles por ordenador de la reivindicación 21, en los que las instrucciones, cuando se ejecutan, hacen además que el UE:
    si la configuración de la referencia de tiempos de HARQ de al menos una célula servidora de la pluralidad de células servidoras es la configuración 5, determine una cantidad de bits de HARQ para ventanas de agrupación de las células servidoras individuales en función de:
    si ninguna de las configuraciones de la referencia de tiempos de HARQ de la pluralidad de células servidoras es la configuración 5, determine la cantidad de bits de HARQ para ventanas de agrupación de las células servidoras individuales en función de:
    en la que c es un índice de la primera célula servidora, Oc es una cantidad de bits de HARQ que corresponde a la
    célula servidora de la cth,
    es una cantidad de subtramas de enlace descendente en la ventana de agrupación de la célula servidora de la cth, en la que la ventana de agrupación se determina según una configuración de la referencia de tiempos de HARQ de la célula servidora de la cth y excluye subtramas especiales de las configuraciones 0 y 5 con prefijo cíclico (CP) de enlace descendente normal y de las configuraciones 0 y 4 con CP
    de enlace descendente ampliado,
    es el valor determinado para la pluralidad de células servidoras, Uc es una cantidad de transmisiones de canal compartido de enlace descendente físico (PDSCH) y de transmisiones de canal de control de enlace descendente físico (PDCCH), que indican liberación de la planificación semipersistente (SPS) de enlace descendente, que se recibe en subtramas de la ventana de agrupación de la célula servidora de la cth, U
    es un máximo de la Uc y es una cantidad de bloques de transporte soportada por subtrama para un modo de
    th
    transmisión de la célula servidora de la c.
  23. 23.
    El uno o más soportes legibles por ordenador de la reivindicación 20, en los que las instrucciones, cuando se ejecutan, hacen además que el UE:
    perfore elementos de recursos del canal compartido de enlace ascendente físico (PUSCH) de la primera subtrama de enlace ascendente en función del tamaño determinado del libro de códigos HARQ-ACK.
  24. 24.
    Uno o más soportes legibles por ordenador que tienen instrucciones que, cuando se ejecutan, hacen que el controlador de realimentación:
    reciba un índice de asignación de enlace descendente (DAI) y
    si la configuración de la referencia de tiempos de HARQ de al menos una célula servidora de una pluralidad de células servidoras configuradas es la configuración 5, determine una cantidad de bits de HARQ-ACK que corresponde a cada célula servidora en función de:
    si ninguna de las configuraciones de la referencia de tiempos de HARQ de la pluralidad de células servidoras agregadas es la configuración 5, determine la cantidad de bits de HARQ-ACK que corresponde a cada célula servidora de la pluralidad de células servidoras en función de:
    en la que c es un índice de la primera célula servidora, Oc es una cantidad de bits de HARQ que corresponde a la
    célula servidora de la cth,
    es una cantidad de subtramas de enlace descendente en la ventana de agrupación de la célula servidora de la cth, en la que la ventana de agrupación se determina según una configuración de la referencia de tiempos de HARQ de la célula servidora de la cth y excluye subtramas especiales de las configuraciones 0 y 5 con prefijo cíclico (CP) de enlace descendente normal y de las configuraciones 0 y 4 con CP
    de enlace descendente ampliado,
    es un valor que corresponde al DAI en formato de DCI para asignación de recursos de enlace ascendente, Uc es una cantidad de transmisiones de canal compartido de enlace descendente físico (PDSCH) y de transmisiones de canal de control de enlace descendente físico (PDCCH), que indican liberación de la planificación semipersistente (SPS) de enlace descendente, que se recibe en subtramas de la
    ventana de agrupación de la célula servidora de la cth, U es un máximo de la Uc y
    es una cantidad de bloques de transporte soportada por subtrama para un modo de transmisión de la célula servidora de la cth .
  25. 25. El uno o más soportes legibles por ordenador de la reivindicación 24, en los que las instrucciones, cuando se ejecutan, hacen además que el controlador de realimentación:
    determine una configuración de Bloque de Información de Sistema 1 (SIB1) para una célula servidora principal (PCell) de la pluralidad de células servidoras;
    determine una configuración de SIB1 para una segunda célula servidora secundaria (SCell) de la pluralidad de células servidoras configuradas y
    determine una referencia de tiempos de HARQ para la SCell en función de la configuración de SIB1 de la PCell y de la configuración de SIB1 de la SCell.
  26. 26. El uno o más soportes legibles por ordenador de la reivindicación 25, en los que las instrucciones, cuando se ejecutan, hacen además que el controlador de realimentación:
    determine una cantidad de subtramas de enlace descendente en la ventana de agrupación de la SCell en función de la referencia de tiempos de HARQ determinada.
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