JP2023029640A - User device, network device, and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient solution for data communication between a base station and a user device.

SOLUTION: A method to be performed by a user device includes receiving a downlink scheduling grant corresponding to downlink data transmission in a short time interval unit of a first carrier, receiving the downlink data transmission in a long time interval unit of a second carrier, and transmitting HARQ feedback corresponding to the downlink data transmission in the same time interval unit as the time interval unit in which the downlink data transmission was received. The long time interval unit is determined according to the ratio of the length of the short time interval unit in which the corresponding downlink scheduling grant was received, to the length of the long time interval unit.

SELECTED DRAWING: Figure 10

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD Embodiments of the present disclosure relate generally to wireless communication technologies, and more particularly to data transmission and Hybrid Automatic Repeat reQuest (HARQ) feedback in wireless communication systems supporting Carrier Aggregation (CA). It relates to a method and apparatus for

This section introduces aspects that may facilitate a better understanding of the present disclosure. Accordingly, the statements in this section should be read in this light and should not be understood as an admission to what is in the prior art or not in the prior art.

While standardization of the fourth generation (4G) radio access technology (RAT), Long Term Evolution-Advanced (LTE-A) is underway, Discussions have already begun for Beyond 4G, commonly referred to as 5G. In 5G systems, latency requirements become even more stringent, resulting in short round-trip times (RTT) with fast control signaling and flexible uplink (UL)/downlink (Downlink, DL) ratio support is implemented.

Therefore, a physical subframe structure for 5G systems is proposed, as shown in FIG. As shown, each subframe or Transmission Time Interval (TTI) includes a DL control region, a UL control region, and a DL/UL data transmission region in that order. For example, the DL control region may be used to send a DL scheduling grant or a UL scheduling grant to the user equipment, or HARQ feedback for the user equipment's UL data transmission. may be used by the base station to transmit the The UL control region may be used by user equipment to send HARQ feedback for DL data transmission. The data transmission regions may be used to transmit DL data transmissions from the base station or UL data transmissions from the user equipment according to respective scheduling grants. The control region is placed before the data transmission region to enable fast and cost-effective pipelining at the receiver.

Another proposal of a physical subframe structure for 5G systems is shown in FIG. As shown, each subframe or TTI includes a DL control region, a DL/UL data transmission region, and a UL control region in that order. In this structure, the DL control region is placed before the data transmission placed before the UL control region to minimize HARQ RTT.

LTE-A employs carrier aggregation of multiple component carriers with the same length of subframe/TTI to improve throughput. However, in 5G systems, with higher carrier frequencies, different length sub-carriers/TTIs may be adopted on different carriers even in the high frequency band.

Various embodiments of the present disclosure provide efficient solutions for performing data communication between base stations and user equipment to accommodate TTIs of different lengths in carrier aggregation in 5G systems. With the goal. Other features and advantages of embodiments of the disclosure will also be understood from the following description of specific embodiments, read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the disclosure.

In a first aspect of the present disclosure, in a wireless communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, A method performed at a base station for performing data transmission to a user equipment is provided. The method includes providing at least one downlink scheduling grant corresponding to data transmission to the user equipment in at least one downlink control region of a short TTI on a first carrier and a long TTI on a second carrier. transmitting in a short TTI data transmission region on the first carrier and in a long TTI data transmission region on the second carrier, as indicated by the at least one downlink scheduling grant; , performing downlink data transmission to the user equipment.

In a second aspect of the present disclosure, in a wireless communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, A method implemented in a user equipment for transmitting HARQ feedback to a base station is provided. The method comprises receiving downlink data transmissions from a base station in a long TTI data transmission region on a second carrier and in a short TTI data transmission region on a first carrier; transmitting HARQ feedback for the received downlink data transmission to the base station in at least one uplink control region of a short TTI on one carrier and a long TTI on the second carrier. and including.

In a third aspect of the present disclosure, in a wireless communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, A method performed by a user equipment is provided for performing data transmission to a base station. The method includes at least one uplink scheduling grant for data transmission to the base station in a downlink control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier. and in a short TTI data transmission region on the first carrier and in a long TTI data transmission region on the second carrier, as indicated by the at least one uplink scheduling grant. in performing uplink data transmission to the base station.

In a fourth aspect of the present disclosure, in a wireless communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, A method performed at a base station for transmitting HARQ feedback to a user equipment is provided. The method comprises receiving uplink data transmissions from the user equipment in a short TTI data transmission region on a first carrier and in a long TTI data transmission region on a second carrier; Sending HARQ feedback for the received uplink data transmission to the user equipment in at least one downlink control region of a short TTI on a first carrier and a long TTI on the second carrier. including doing and

In a fifth aspect of the present disclosure, in a communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, user An apparatus is provided at a base station for performing data transmission to the apparatus. The apparatus includes at least one downlink scheduling grant corresponding to data transmission to the user equipment in at least one downlink control region of a short TTI on a first carrier and a long TTI on a second carrier. and in a data transmission region of a short TTI on said first carrier and a long on said second carrier as indicated by said at least one downlink scheduling grant a transmitter configured to perform downlink data transmission to the user equipment in a data transmission region of a TTI.

In a sixth aspect of the present disclosure, in a communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, the base An apparatus is provided in a user equipment for performing HARQ feedback transmission to a station. The apparatus is configured to receive downlink data transmissions from the base station in a long TTI data transmission region on a second carrier and in a short TTI data transmission region on a first carrier. a receiver and HARQ feedback for the received downlink data transmission in an uplink control region of at least one of a short TTI on the first carrier and a long TTI on the second carrier; a transmitter configured to transmit to the base station.

In a seventh aspect of the present disclosure, in a communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, the base An apparatus is provided in a user equipment for performing data transmission to a station. The apparatus includes at least one uplink scheduling grant for data transmission to the base station in at least one downlink control region of a short TTI on a first carrier and a long TTI on a second carrier. in a short TTI data transmission region on the first carrier and in a long TTI on the second carrier, as indicated by the at least one uplink scheduling grant a transmitter configured to perform uplink data transmission to the base station in a data transmission region of a TTI.

In an eighth aspect of the present disclosure, in a wireless communication system that supports carrier aggregation of at least one first carrier to which short TTI is applied and at least one second carrier to which long TTI is applied, An apparatus is provided at a base station for transmitting HARQ feedback to user equipment. The apparatus is configured to receive uplink data transmissions from the user equipment in a long TTI data transmission region on a second carrier and in a short TTI data transmission region on a first carrier. a receiver and, in a downlink control region of at least one of a short TTI on the first carrier and a long TTI on the second carrier, providing HARQ feedback for the received uplink data transmission to the user equipment; a transmitter configured to transmit to.

The above and other aspects, features, and advantages of various embodiments of the present disclosure will become more fully apparent from the following detailed description when read, by way of example, of the accompanying drawings.

FIG. 1 shows the physical subframe structure for the proposed 5G system.

FIG. 2 shows a physical subframe structure for another proposed 5G system.

FIG. 3 shows a flowchart of a method 300 for data transmission, according to some embodiments of the present disclosure.

FIG. 4 shows two examples showing the relationship between scheduling grant transmissions and data transmissions, given the frame structure shown in FIG.

FIG. 5 shows another example showing the relationship between scheduling grant transmission and data transmission, given the frame structure shown in FIG. 2, according to the first embodiment of method 300 .

FIG. 6 shows two examples showing the relationship between scheduling grant transmissions and data transmissions, given the frame structure shown in FIG. 1, according to the second embodiment of method 300 .

FIG. 7 shows another example showing the relationship between scheduling grant transmissions and data transmissions, given the frame structure shown in FIG. 2, according to the second embodiment of method 300 .

FIG. 8 shows two examples showing the relationship between scheduling grant transmissions and data transmissions, given the frame structure shown in FIG.

FIG. 9 shows another example showing the relationship between scheduling grant transmission and data transmission, given the frame structure shown in FIG. 2, according to the third embodiment of method 300 .

FIG. 10 shows a flowchart of a method 1000 for HARQ feedback transmission, according to some embodiments of the present disclosure.

FIG. 11 shows two examples showing the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG.

FIG. 12 shows two examples showing the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG.

FIG. 13 shows an example showing the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG.

FIG. 14 shows another example showing the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG. 2, according to the third embodiment of method 1000 .

FIG. 15 shows two examples illustrating the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG. 1, according to the fourth embodiment of method 1000. FIG.

FIG. 16 shows an example showing the relationship between DL data transmission and HARQ feedback transmission, given the frame structure shown in FIG.

FIG. 17 shows a flowchart of a method 1700 for data transmission, according to some embodiments of the present disclosure.

FIG. 18 shows an example showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 19 shows another example showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 20 shows two examples showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 21 shows another example showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 22 shows an example showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 23 shows another example showing the relationship between UL scheduling and UL data transmission, given the frame structure shown in FIG.

FIG. 24 shows a flowchart of a method 2400 for HARQ feedback transmission, according to some embodiments of the present disclosure.

FIG. 25 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG.

FIG. 26 shows two further examples showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG.

FIG. 27 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG.

FIG. 28 shows two further examples showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG.

FIG. 29 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG.

FIG. 30 shows two further examples showing the relationship between UL data transmissions and HARQ feedback transmissions, given the frame structure shown in FIG. 2, according to the first embodiment of method 2400.

FIG. 31 shows a schematic block diagram of an apparatus 3100 for performing data transmission to user equipment, according to some embodiments of the present disclosure.

FIG. 32 shows a schematic block diagram of an apparatus 3200 for sending HARQ feedback to a base station, according to some embodiments of the present disclosure.

FIG. 33 shows a schematic block diagram of an apparatus 3300 for performing data transmission to a base station, according to some embodiments of the present disclosure.

FIG. 34 shows a schematic block diagram of an apparatus 3400 for transmitting HARQ feedback to user equipment according to some embodiments of the present disclosure.

FIG. 35 shows a schematic block diagram of an apparatus 3500 for performing data transmission according to some embodiments of the disclosure or for transmitting HARQ feedback according to some other embodiments of the disclosure. showing.

Like reference numbers and designations in the various drawings indicate like elements.

The principles and ideas of the present disclosure will now be explained with reference to illustrative embodiments. It should be understood that all of these embodiments are merely provided for those skilled in the art to better understand and further practice the present disclosure, and are not intended to limit the scope of the present disclosure. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield a still further embodiment. For clarity, not all features of actual implementations are described herein.

References herein to "an embodiment," "another embodiment," "a further embodiment," and similar expressions are explained Although embodiments include the particular features, structures, or characteristics, it is intended that not all embodiments necessarily include the particular features, structures, or characteristics described above. Moreover, such phrases are not required to refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in relation to an embodiment, it is within the knowledge of those skilled in the art that such a feature, structure, or feature is described in relation to other embodiments not explicitly described or described. It indicates that a particular feature, structure, or characteristic has an effect.

Terms such as "first" and "second" are used herein to describe various elements, which elements are to be limited by these terms. It should be understood that it is not These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a second element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the terms "comprises," "comprising," "has," "having," "includes," and/or " "including" identifies the presence of a stated feature, element and/or component, etc., but not the presence of one or more other features, elements, components, and/or combinations thereof. or additions are not excluded.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. . For example, the term "base station (BS)" as used herein may refer to eNB, eNodeB, NodeB, or base transceiver station (BTS), Access Node, AN) or an access point (AP). Similarly, the term “user equipment (UE)” as used herein refers to any terminal device with wireless communication capabilities. Terminal devices include mobile phones, cellular phones, smart phones, personal digital assistants (PDAs), portable computers, image capture devices such as digital cameras, game devices, music storage, playback devices, and any device with wireless communication capabilities. Including, but not limited to, portable units or terminals, Internet appliances that enable wireless Internet access and browsing, and the like.

Hereinafter, embodiments of the present disclosure propose novel solutions for data transmission and HARQ feedback applicable to wireless communication systems supporting carrier aggregation of frequency carriers with different TTIs applied.

FIG. 3 shows a flowchart of a method 300 for data transmission, according to some embodiments of the present disclosure. Method 300 includes at least one component carrier on which short TTI is applied (hereinafter referred to as "first carrier") and at least one component carrier on which long TTI is applied (hereinafter referred to as "second carrier"). ) and in a wireless communication system supporting carrier aggregation, in a base station to perform data transmission to a user equipment. Each long TTI and short TTI may include a DL control region, a UL control region, and a data transmission region, but not necessarily in that order. As an example, the DL control region may be used by the base station to send DL scheduling grants or UL scheduling grants to the user equipment. A data transmission region may be used to transmit DL data transmissions from the base station to the user equipment in response to each scheduling grant.

Note that the terms "short" and "long" as used herein simply refer to a relative length relationship in which the long TTI is relatively longer than the short TTI. Also, as used herein, expressions such as "long/short TTI applied carrier" refer to the timing for any transmission on a carrier according to the structure of the corresponding TTI.

As shown in FIG. 3, method 300 begins at block 310, in which the base station determines whether in the DL control region of a long TTI on the second carrier or a short TTI on the first carrier. or in both the long TTI on the second carrier and the short TTI on the first carrier, at least one DL scheduling grant corresponding to data transmission to the user equipment. do.

Next, at block 320, the base station performs data transmission in the long TTI data transmission region on the second carrier and in the short TTI data transmission on the first carrier as indicated by the at least one DL scheduling grant. DL data transmission to the user equipment is performed in the region.

In a first embodiment of method 300, the base station may transmit a DL scheduling grant corresponding to DL data transmission on the second carrier in the DL control region of the long TTI on the second carrier. , in the DL control region of the short TTI on the first carrier, DL scheduling grants corresponding to DL data transmissions on the first carrier may be transmitted. In this embodiment, the base station sends DL data on the first carrier in the short TTI in which the corresponding DL scheduling grant was sent or in the short TTI immediately after the short TTI in which the corresponding DL scheduling grant was sent. Send may be executed. Similarly, the base station may send DL data transmission on the second carrier in the long TTI in which the corresponding DL scheduling grant was sent or in the long TTI immediately after the long TTI in which the corresponding DL scheduling grant was sent. may be executed.

FIG. 4 shows two examples showing the relationship between DL scheduling and data transmission, given the frame structure shown in FIG. Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure.

は、ガードピリオド（ｇｕａｒｄ ｐｅｒｉｏｄ、ＧＰ）を表している。アイコン

は、ＤＬ制御領域を表している。アイコン

は、ＵＬ制御領域を表している。アイコン

は、ＤＬ又はＵＬデータ送信のためのデータ送信領域を表している。ＴＴＩのシーケンスは、基地局とユーザ装置との間の送信のためのタイミングを示している。また、図に示される曲線の矢印は、ＤＬスケジューリングとデータ送信との関係を示している。 In this figure and in Figures 5-9 below, the icon

represents a guard period (GP). icon

represents the DL control area. icon

represents the UL control region. icon

represents the data transmission region for DL or UL data transmission. A sequence of TTIs indicates the timing for transmissions between the base station and the user equipment. Also, the curved arrows shown in the figure indicate the relationship between DL scheduling and data transmission.

As shown in FIG. 4, the base station transmits DL scheduling grants corresponding to DL transmissions on the first carrier in the DL control region of each short TTI, and in the DL control region of each long TTI: Send a DL scheduling grant for DL transmission on the second carrier.

Corresponding to scheduling, DL data transmission on a carrier may be performed in the TTI (including long TTI and short TTI) immediately following the TTI in which the corresponding DL scheduling grant was transmitted on the same carrier. In the example shown in FIG. 4(a), the base station transmits the DL scheduling grant on the first carrier in the DL control region of short TTI0, followed by the DL data transmission region of short TTI1 in the first DL data transmission on each carrier may be performed. Similarly, the base station transmits a DL scheduling grant on the second carrier in the DL control region of long TTI0, followed by DL data transmission on the second carrier in the DL data transmission region of long TTI1. may be executed.

Alternatively, in response to scheduling, DL data transmission on a carrier may be performed in TTIs (including long TTIs and short TTIs) in which the corresponding DL scheduling grant is transmitted on the same carrier. In the example shown in FIG. 4(b), the base station transmits the DL scheduling grant on the first carrier in the DL control region of short TTI0, followed by the DL data transmission region of the same short TTI0 in the second DL data transmission on one carrier may be performed. Similarly, the base station transmits a DL scheduling grant on the second carrier in the DL control region of long TTI0, followed by DL data transmission on the second carrier in the same DL data transmission region of long TTI0. may be executed.

As another alternative, in response to scheduling, DL data transmission on the first carrier may be performed in a short TTI immediately following the short TTI in which the corresponding DL scheduling grant was transmitted, while , DL data transmission on the second carrier may be performed in the long TTI in which the corresponding DL scheduling grant is transmitted. Alternatively, DL data transmission on the first carrier may be performed in the short TTI in which the corresponding DL scheduling grant was sent, while DL data transmission on the second carrier is performed in the corresponding It may be performed in the long TTI immediately following the long TTI in which the DL scheduling grant was sent. This alternative case is not shown in the figure.

FIG. 5 shows another example showing the relationship between DL scheduling and data transmission given the frame structure shown in FIG. 2, according to the first embodiment of method 300 . Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure. The only difference between FIG. 5 and FIG. 4 is the use of different frame structures. In FIG. 5, DL scheduling and data transmission have the same relationship as described above with reference to FIG. 4, so this will not be detailed here.

In a second embodiment of method 300, the base station may transmit a DL scheduling grant corresponding to data transmission on the first carrier in a DL control region of a short TTI on the first carrier; Also, in the DL control region of the short TTI on the first carrier, DL scheduling grants corresponding to data transmission on the second carrier may be transmitted. In this embodiment, the DL data transmission on the first carrier is performed in the short TTI in which the corresponding DL scheduling grant was sent or in the short TTI immediately following the short TTI in which the corresponding DL scheduling grant was sent. May be. Correspondingly, DL data transmission on the second carrier may be performed in long TTIs of index n _long . The index n _long and the index n _short of the short TTI in which the corresponding DL scheduling grant was sent have the relationship n _long =n _short /2, where n _short is an even number.

FIG. 6 shows two examples showing the relationship between DL scheduling and data transmission, given the frame structure shown in FIG. 1, according to the second embodiment of method 300. FIG. Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure.

As shown in FIG. 6, the base station may send DL scheduling grants corresponding to DL transmissions on the first carrier in the DL control region of the short TTI, or the short TTI on the first carrier. DL scheduling grants corresponding to DL transmissions on the second carrier may be transmitted in the DL control region of . In general, the base station may send DL scheduling grants corresponding to DL transmissions on the first carrier in each short TTI, and depending on the ratio of the length of the short TTI to the length of the long TTI, DL scheduling grants corresponding to DL transmissions on the second carrier may be sent every two or more short TTIs.

Corresponding to scheduling, DL data transmission on the first carrier may be performed in the short TTI immediately following the short TTI in which the DL scheduling grant corresponding to the DL data transmission on the first carrier was sent. while DL data transmission on the second carrier may be performed in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the DL scheduling grant corresponding to the DL data transmission on the second carrier was transmitted have the relationship n _long =n _short /2, where n _short is is an even number. In the example shown in FIG. 6(a), the base station sends a DL scheduling grant for DL data transmission on the first carrier in the DL control region of short TTI0, followed by DL data of short TTI1. DL data transmission on the first carrier is performed in the transmission region. After that, the base station transmits another DL scheduling grant on the first carrier in the DL control region of short TTI1, followed by DL data transmission on the first carrier in the DL data transmission region of short TTI2. to run. For DL data transmission on the second carrier, the base station may send a DL scheduling grant in the DL control region of short TTI0 and perform DL data transmission in the DL data transmission region of long TTI0. . The base station then transmits another DL scheduling grant on the second carrier in the DL control region of short TTI2, followed by DL data transmission on the second carrier in the DL data transmission region of long TTI1. may be executed.

Those skilled in the art will appreciate that the number after each "TTI" shown in the figures indicates the index (usually an integer) of that TTI.

Alternatively, corresponding to scheduling, DL data transmission on the first carrier may be performed in a short TTI in which a DL scheduling grant corresponding to DL data transmission on the first carrier is sent; On the other hand, DL data transmission on the second carrier may be performed in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the DL scheduling grant corresponding to the DL data transmission on the second carrier was transmitted have the relationship n _long =n _short /2, where n _short is is an even number. In the example shown in FIG. 6(b), the base station transmits the DL scheduling grant corresponding to the DL data transmission on the first carrier in the DL control region of short TTI 0, followed by the DL scheduling grant of the same short TTI. DL data transmission on the first carrier is transmitted in the data transmission region. After that, the base station transmits another DL scheduling grant on the first carrier in the DL control region of short TTI1, followed by DL data on the first carrier in the DL data transmission region of the same short TTI1. send send. For DL data transmission on the second carrier, the base station transmits a DL scheduling grant on the first carrier in the DL control region of short TTI0, followed by the DL data transmission region of long TTI0: DL data transmission may be transmitted. After that, the base station transmits another DL scheduling grant on the first carrier in the DL control region of short TTI2, followed by DL data transmission on the second carrier in the DL data transmission region of long TTI1. may be sent.

FIG. 7 shows another example showing the relationship between DL scheduling and data transmission when using the frame structure shown in FIG. 2 according to the second embodiment of method 300. In FIG. Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure. The only difference between Figures 6 and 7 is the use of different frame structures. In FIG. 7, DL scheduling and data transmission have the same relationship as described above with reference to FIG. 6, so this will not be detailed here.

In a third embodiment of method 300, a base station, in a DL control region of a long TTI on a second carrier, sends a DL scheduling grant corresponding to data transmission on a first carrier and a DL scheduling grants corresponding to data transmission may be transmitted. In this embodiment, DL data transmission on the second carrier is performed in the long TTI in which the corresponding DL scheduling grant was sent or in the long TTI immediately following the long TTI in which the corresponding DL scheduling grant was sent. be done. Correspondingly, DL data transmission on the first carrier is performed in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long =floor(n _short /2), where n _short is an integer. Alternatively, DL data transmission on the first carrier is performed in a short TTI with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long = floor((n _short −1)/2), where n _short is an integer .

FIG. 8 shows two examples showing the relationship between DL scheduling and data transmission when using the frame structure shown in FIG. 1 according to the third embodiment of method 300. In FIG. Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure.

As shown in FIG. 8, the base station may transmit DL scheduling grants corresponding to DL transmissions on the second carrier in the DL control region of the long TTI on the first carrier. DL scheduling grants corresponding to DL transmissions on the first carrier may also be transmitted in the DL control region of the long TTI on the first carrier.

Corresponding to the scheduling, as shown in FIG. 8(a), the DL data transmission on the second carrier is a long TTI in which the DL scheduling grant corresponding to the DL data transmission on the second carrier has been performed. Executed in the immediately following long TTI. DL data transmission on the first carrier is performed in a short TTI with index n _short . the index n _short and the index n _long of the long TTI in which the DL scheduling grant corresponding to the DL data transmission on the first carrier was transmitted have the relationship n _long =floor(n _short /2), n _short is an integer.

In the example shown in FIG. 8(a), the base station transmits a DL scheduling grant corresponding to DL data transmission on the second carrier in the DL control region of long TTI0, followed by DL data of long TTI1. DL data transmission on the second carrier is performed in the transmission region. The base station then transmits another DL scheduling grant in the DL control region of long TTI1, followed by DL data transmission on the second carrier in the DL data transmission region of long TTI2, and so on. I do. For DL data transmission on the first carrier, the base station transmits a DL scheduling grant in the DL control region of long TTI0 and corresponding to this scheduling DL data transmission of short TTI0 and/or short TTI1. DL data transmission may be performed in the region. The base station then transmits another DL scheduling grant in the DL control region of long TTI1, and corresponding to this scheduling, in the DL data transmission region of short TTI2 and/or short TTI3 on the first carrier. A process such as executing DL data transmission may be performed.

Alternatively, as shown in FIG. 8(b), corresponding to the scheduling, DL data transmission on the second carrier was sent a DL scheduling grant corresponding to the DL data transmission on the second carrier. May be performed in long TTIs. DL data transmission on the first carrier is performed in a short TTI with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long =floor(n _short /2), where n _short is an integer.

In the example shown in FIG. 8(b), the base station transmits a DL scheduling grant corresponding to DL data transmission on the second carrier in the DL control region of long TTI0, followed by DL data of long TTI0. DL data transmission is performed in the transmission domain. The base station then transmits another DL scheduling grant in the DL control region of long TTI1, followed by DL data transmission on the second carrier in the same DL data transmission region of long TTI1, and so on. process. For DL data transmission on the first carrier, the base station transmits a DL scheduling grant in the DL control region of long TTI0 and corresponding to this scheduling DL data transmission of short TTI0 and/or short TTI1. DL data transmission on the first carrier may be performed in the region. The base station then transmits another DL scheduling grant in the DL control region of long TTI1, and corresponding to this scheduling, in the DL data transmission region of short TTI2 and/or short TTI3 on the first carrier. A process such as executing DL data transmission may be performed.

FIG. 9 shows another example showing the relationship between DL scheduling and data transmission when using the frame structure shown in FIG. 2 according to the third embodiment of method 300. In FIG. Note that this example is provided for illustrative purposes only and is not for any limitation of the present disclosure. The difference between Figures 9 and 8 lies in the use of different frame structures and DL data transmission on the first carrier.

DL scheduling and data transmission on the second carrier have the same relationship as described above with reference to FIG. 4, so this will not be detailed here. The following discussion only focuses on the relationship between DL scheduling and data transmission on the first carrier.

As shown in FIG. 9, the base station may transmit DL scheduling grants corresponding to DL transmissions on the first carrier in the DL control region of long TTI with index n _long .

Corresponding to the scheduling, DL data transmission on the first carrier may be performed in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long = floor((n _short −1)/2), where n _short is an integer .

For example, as shown in FIG. 9, the base station transmits a DL scheduling grant corresponding to DL data transmission on the first carrier in the DL control region of long TTI0 on the second carrier, and for this scheduling Correspondingly, DL data transmission on the first carrier may be performed in the DL data transmission regions of short TTI1 and/or short TTI2. The base station then transmits another DL scheduling grant in the DL control region of long TTI1 on the second carrier and, corresponding to this scheduling, in the DL data transmission region of short TTI3 and/or short TTI4: Operations such as performing DL data transmission on the first carrier may be performed.

FIG. 10 shows a flowchart of a method 1000 for sending HARQ feedback, according to some embodiments of the present disclosure. Method 1000 includes at least one component carrier on which short TTI is applied (hereinafter referred to as "first carrier") and at least one component carrier on which long TTI is applied (hereinafter referred to as "second carrier"). ) and in a wireless communication system supporting carrier aggregation, in a user equipment to send HARQ feedback to a base station. Each long TTI and short TTI may include a DL control region, a UL control region, and a data transmission region, but not necessarily in that order. As an example, the DL control region may be used by the user equipment to receive DL scheduling grants or UL scheduling grants from the base station. The UL control region may be used by user equipment to send HARQ feedback for DL data transmission. The data transmission area may be used by user equipment to receive DL data transmissions from the base station.

As shown, the method 1000 begins at block 1010, where a user equipment transmits data in a short TTI data transmission region on a first carrier and in a long TTI data transmission region on a second carrier. In the transmission area, it receives DL data transmissions from the base station.

In block 1020, the user equipment either in the UL control region of the short TTI on the first carrier, or in the UL control region of the long TTI on the second carrier, or the short TTI and the second carrier on the first carrier. HARQ feedback for received DL data transmissions in both UL control regions of the long TTI on 2 carriers is sent to the base station.

In a first embodiment of method 1000, the user equipment for the DL data transmission received on the first carrier immediately after or two short TTIs after the short TTI in which the DL data transmission was received. HARQ feedback may be sent on the first carrier.

Similarly, the user equipment may send HARQ feedback for the DL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the DL data transmission is received, in the second You can send it on your carrier.

FIG. 11 shows two examples showing the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG. 1 according to the first embodiment of method 1000. FIG.

In the example shown in FIG. 11(a), the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in a short TTI immediately after the short TTI in which the DL data transmission was received. and also send HARQ feedback for the DL data transmission received on the second carrier in the long TTI immediately following the long TTI in which the DL data transmission was received.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in short TTI1, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI1, it will subsequently send HARQ feedback for the received DL data transmission in short TTI2. etc. may be performed.

Similarly, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI 0, it will subsequently send HARQ feedback for the received DL data transmission in long TTI 1. Also good. Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in long TTI2, it sends HARQ feedback for the received DL data transmission. etc. may be performed.

In the example shown in FIG. 11(b), the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in two short TTIs after the short TTI in which the DL data transmission was received. and sending HARQ feedback for the DL data transmission received on the second carrier in two long TTIs after the long TTI in which the DL data transmission was received.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in short TTI2, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI 1, then in short TTI 3 it sends HARQ feedback for the received DL data transmission. etc. may be performed.

Similarly, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI 0, it will subsequently send HARQ feedback for the received DL data transmission in long TTI 2. Also good. Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in long TTI1, then in long TTI3, it sends HARQ feedback for the received DL data transmission. etc. may be performed.

In a second embodiment of method 1000, the user equipment for the DL data transmission received on the first carrier immediately after or two short TTIs after the short TTI in which the DL data transmission was received. , may transmit HARQ feedback on the first carrier.

For sending HARQ feedback by the user equipment for DL data transmissions received on the second carrier, there are two alternative options as follows.
• The user equipment may send HARQ feedback on the first carrier for DL data transmissions received on the second carrier in short TTIs of index n _short . The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*(n _long +1)+1, where n _long is an integer. or
• The user equipment may send HARQ feedback on the first carrier for DL data transmissions received on the second carrier in short TTIs of index n _short . The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*(n _long +1), where n _long is an integer.

FIG. 12 shows two examples illustrating the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG. 1 according to the second embodiment of method 1000. FIG.

In the example shown in Figure 12(a), the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in two short TTIs after the short TTI in which the DL data transmission was received. and send HARQ feedback for the DL data transmission received on the second carrier in the short TTI with index n _short . The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*(n _long +1)+1, where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in short TTI2, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI 1, then in short TTI 3 it sends HARQ feedback for the received DL data transmission. etc. may be performed.

For DL data transmission on the second carrier, the user equipment receives DL data transmission on the second carrier from the base station in long TTI0, followed by received DL data in short TTI3. HARQ feedback for transmission may be sent. Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI 1, then in short TTI 5 it sends HARQ feedback for the received DL data transmission. etc. may be performed.

In the example shown in FIG. 12(b), the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in a short TTI immediately after the TTI in which the DL data transmission was received. , in the short TTI with index n _short , HARQ feedback for the DL data transmission received on the second carrier. The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*(n _long +1), where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in short TTI1, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI1, it will subsequently send HARQ feedback for the received DL data transmission in short TTI2. etc. may be performed.

For DL data transmission on the second carrier, the user equipment receives DL data transmission on the second carrier from the base station in long TTI0, followed by received DL data in short TTI2. HARQ feedback for transmission may be sent. Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in short TTI2, the user equipment sends HARQ feedback for the received DL data transmission to the second Processing such as transmission may be performed on one carrier.

In a third embodiment of method 1000, the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in the same short TTI as the short TTI in which the DL data transmission was received. may be sent on any carrier.

For sending HARQ feedback by the user equipment for DL data transmissions received on the second carrier, there are two alternative options as follows.
• The user equipment may send HARQ feedback on the second carrier for the DL data transmission received on the second carrier in the long TTI in which the DL data transmission was received. or
• The user equipment may send HARQ feedback on the first carrier for DL data transmissions received on the second carrier in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*n _long +1, where n _long is an integer.

FIG. 13 shows an example showing the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG.

As shown in FIG. 13, the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in the same short TTI in which the DL data transmission was received, and Send HARQ feedback for the DL data transmission received on the second carrier in the same long TTI in which the transmission was received. In this way the delay between data transmission and HARQ feedback can be minimized.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in the same short TTI0, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI1, then in the same short TTI1, it subsequently sends HARQ feedback for the received DL data transmission. You may perform processing, such as carrying out.

Similarly, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI0, it will subsequently send HARQ feedback for the received DL data transmission in the same long TTI0. can be Subsequently, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in the same long TTI1, it subsequently sends HARQ feedback for the received DL data transmission. You may perform processing, such as carrying out.

FIG. 14 shows another example of the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG. 2 according to the third embodiment of method 1000. In FIG.

As shown, the user equipment sends HARQ feedback for the DL data transmission received on the first carrier in the same short TTI in which the DL data transmission was received, index n _short HARQ feedback for the DL data transmission received on the second carrier in the short TTI with is sent on the first carrier. The index n _short and the index n _long of the long TTI in which the DL data transmission was received have the relationship n _short =2*n _long +1, where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in the same short TTI0, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI1, then in the same short TTI1, it subsequently sends HARQ feedback for the received DL data transmission. You may perform processing, such as carrying out.

For DL data transmission on the second carrier, the user equipment receives DL data transmission on the second carrier from the base station in long TTI0, followed by received DL data in short TTI1. HARQ feedback for transmission may be sent on the first carrier. Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in short TTI3, if the user equipment receives HARQ feedback for the received DL data transmission in the second Processing such as transmission may be performed on one carrier.

In a fourth embodiment of method 1000, the user equipment for the DL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the DL data transmission was received. Transmit HARQ feedback on the second carrier and HARQ feedback for the DL data transmission received on the first carrier in a long TTI with index n _long on the second carrier. , may be sent. The index n _long and the index n _short of the short TTI in which the DL data transmission was received have the relationship n _long =floor(n _short /2)+1, where n _short is an integer.

FIG. 15 shows two examples illustrating the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG. 1 according to the fourth embodiment of method 1000. FIG.

In the example shown in Figure 15(a), the user equipment sends HARQ feedback for the DL data transmission received on the second carrier in the long TTI immediately following the long TTI in which the DL data transmission was received. and also transmit HARQ feedback for the DL data transmission received on the first carrier in the long TTI with index n _long . The index n _long and the index n _short of the short TTI in which the DL data transmission was received have the relationship n _long =floor(n _short /2)+1, where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0 or TTI1, then in long TTI1, the received DL data HARQ feedback for transmission may be sent. Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI2 or TTI3, then in long TTI2, it will subsequently provide HARQ feedback for the received DL data transmission. Processing such as transmission may be performed.

For DL transmission on the second carrier, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI0, then in long TTI1, the received DL data transmission may send HARQ feedback for Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in long TTI2, it sends HARQ feedback for the received DL data transmission. etc. may be performed.

In the example shown in Figure 15(b), the user equipment sends HARQ feedback for the DL data transmission received on the second carrier in two long TTIs after the long TTI in which the DL data transmission was received. on the second carrier, and HARQ feedback for the DL data transmission received on the first carrier in a long TTI with index n _long , on the second carrier do. The index n _long and the index n _short of the short TTI in which the DL data transmission was received have the relationship n _long =floor(n _short /2)+1, where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0 or short TTI1, then in long TTI1, the received DL HARQ feedback for data transmission may be sent. Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI2 or TTI3, then in long TTI2, it will subsequently provide HARQ feedback for the received DL data transmission. Processing such as transmission may be performed.

For DL data transmission on the second carrier, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI0, then in long TTI2, the received DL data HARQ feedback for transmission may be sent on the second carrier. Then, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in long TTI3, if the user equipment receives HARQ feedback for the received DL data transmission, 2 carrier, processing such as transmission may be performed.

In a fifth embodiment of method 1000, the user equipment sends HARQ feedback on the second carrier for the DL data transmission received on the second carrier in the long TTI in which the DL data transmission is received. , and on the second carrier, HARQ feedback for the DL data transmission received on the first carrier in the long TTI with index n _long . The index n _long and the index n _short of the short TTI in which the DL data transmission was received have the relationship n _long =floor((n _short -1)/2)+1, where n _short is an integer.

FIG. 16 shows an example showing the relationship between DL data transmission and HARQ feedback transmission when using the frame structure shown in FIG. 2 according to the fifth embodiment of method 1000 .

As shown, the user equipment sends HARQ feedback for the DL data transmission received on the second carrier in the same long TTI in which the DL data transmission was received, and index n In the long TTI with _long , send HARQ feedback for the DL data transmission received on the first carrier. The index n _long and the index n _short of the short TTI in which the DL data transmission was received have the relationship n _long =floor((n _short −1)/2)+1, where n _long is an integer.

Specifically, as shown, if the user equipment receives a DL data transmission on the first carrier from the base station in short TTI0, then in long TTI0, the received DL data transmission may be sent on the second carrier. Then, if the user equipment receives the next DL data transmission on the first carrier from the base station in short TTI1 or TTI2, then in long TTI1, it will subsequently provide HARQ feedback for the received DL data transmission. , may be processed, such as transmitting on a second carrier.

For DL data transmission on the second carrier, if the user equipment receives a DL data transmission on the second carrier from the base station in long TTI0, then in the same long TTI0, the received DL HARQ feedback for data transmission may be sent. Subsequently, if the user equipment receives the next DL data transmission on the second carrier from the base station in long TTI1, then in the same long TTI1, it subsequently sends HARQ feedback for the received DL data transmission. You may perform processing, such as carrying out.

Note that the examples shown in FIGS. 11-16 are provided for illustrative purposes only and are not intended to be limiting in any way of the present disclosure.

FIG. 17 shows a flowchart of a method 1700 for data transmission, according to some embodiments of the present disclosure. Method 1700 includes at least one component carrier on which short TTI is applied (hereinafter referred to as "first carrier") and at least one component carrier on which long TTI is applied (hereinafter referred to as "second carrier"). ) and in a wireless communication system supporting carrier aggregation, in a user equipment to perform data transmission to a base station. Each long TTI and short TTI may include a DL control region, a UL control region, and a data transmission region, but not necessarily in that order. As an example, the DL control region may be used by user equipment to receive UL scheduling grants. The UL control region may be used by user equipment to send HARQ feedback for DL data transmission. The data transmission regions may be used by user equipments to transmit UL data transmissions according to their scheduling grants.

As shown, the method 1700 begins at block 1710, where the user equipment performs a DL control region in a short TTI on a first carrier or in a DL control region in a long TTI on a second carrier. At least one UL scheduling grant for data transmission to the base station is received in the control region or in the DL control region of both the short TTI on the first carrier and the long TTI on the second carrier.

In block 1720, the user equipment, as indicated by the at least one UL scheduling grant, in the short TTI data transmission region on the first carrier and in the long TTI data transmission region on the second carrier: Perform UL data transmission to the base station.

In a first embodiment of method 1700, a user equipment may receive a UL scheduling grant for data transmission on a first carrier in a DL control region of a short TTI on the first carrier; A UL scheduling grant for data transmission on the second carrier may be received in the DL control region of the long TTI on the second carrier. In this embodiment, the user equipment performs UL data transmission on the first carrier in the short TTI immediately following the short TTI in which the corresponding UL scheduling grant is received and the long TTI in which the corresponding UL scheduling grant is received. UL data transmission may be performed on the second carrier in the long TTI immediately following the TTI.

FIG. 18 shows an example showing the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG.

は、ガードピリオドを表している。アイコン

は、ＤＬ制御領域を表している。アイコン

は、ＵＬ制御領域を表している。アイコン

は、ＤＬ又はＵＬデータ送信のためのデータ送信領域を表している。ＴＴＩのシーケンスは、基地局とユーザ装置との間の送信のためのタイミングを示している。また、図に示される曲線の矢印は、ＵＬスケジューリングとＵＬデータ送信との関係を示している。 In this figure and in Figures 19-23 below, the icon

represents a guard period. icon

represents the DL control area. icon

represents the UL control region. icon

represents the data transmission region for DL or UL data transmission. A sequence of TTIs indicates the timing for transmissions between the base station and the user equipment. Also, the curved arrows shown in the figure indicate the relationship between UL scheduling and UL data transmission.

As shown in FIG. 18, if the user equipment receives a UL scheduling grant for UL data transmission on the first carrier in short TTI0, then in short TTI1, the UL on the first carrier Data transmission may be executed. Then, if the user equipment receives an UL scheduling grant for UL data transmission on the first carrier in short TTI1, then in short TTI2, it performs UL data transmission on the first carrier, and so on. may be processed.

Similarly, if the user equipment receives an UL scheduling grant for UL data transmission on the second carrier in long TTI0, then in long TTI1, it performs UL data transmission on the second carrier. can be Thereafter, if the user equipment receives an UL scheduling grant for UL data transmission on the second carrier in long TTI1, then in long TTI2, the user equipment performs UL data transmission on the second carrier. Also good.

FIG. 19 shows another example showing the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG. The only difference between Figures 18 and 19 is the use of different frame structures. In FIG. 19, UL scheduling and UL data transmission have the same relationship as described above with reference to FIG. 18, so this will not be detailed here.

In a second embodiment of method 1700, the user equipment may receive a UL scheduling grant for data transmission on the first carrier in a DL control region of a short TTI on the first carrier; UL scheduling grants for data transmission on the second carrier may be received in the DL control region of the short TTI on the first carrier. In general, the user equipment receives UL scheduling grants for UL transmission on the first carrier in each short TTI, depending on the ratio of the length of the short TTI to the length of the long TTI, two or more Receive a UL scheduling grant for UL transmission on the second carrier every short TTI.

According to the received UL scheduling grant, the user equipment may perform UL data transmission on the first carrier in the short TTI immediately following the short TTI in which the corresponding UL scheduling grant was received. The user equipment may also perform UL data transmission on the second carrier in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the corresponding UL scheduling grant was received have the relationship n _long =n _short /2, where n _short is an even number. Or, the index n _long and the index n _short of the short TTI in which the corresponding UL scheduling grant was received have a relationship of n _long =1+n _short /2, where n _short is an even number.

FIG. 20 shows two examples illustrating the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG. 1 according to the second embodiment of method 1700. FIG.

As shown, if the user equipment receives an UL scheduling grant for UL data transmission on the first carrier in short TTI 0, then in short TTI 1 it will subsequently transmit UL data on the first carrier. to run. Then, if the user equipment receives an UL scheduling grant for UL data transmission on the first carrier in short TTI1, then in short TTI2, it performs UL data transmission on the first carrier, and so on. process.

For UL data transmission on the second carrier, in the example of FIG. 20(a), if the user equipment receives an UL scheduling grant for UL data transmission on the second carrier in short TTI 0: Subsequently, in long TTI0, UL data transmission on the second carrier is performed. Thereafter, if the user equipment receives an UL scheduling grant for UL data transmission on the second carrier in short TTI2, then in long TTI1 it will subsequently perform UL data transmission on the second carrier.

In the example shown in FIG. 20(b), if the user equipment receives a UL scheduling grant for UL data transmission on the second carrier in short TTI0, then in long TTI1, the second carrier Perform UL data transmission above. Thereafter, if the user equipment receives an UL scheduling grant for UL data transmission on the second carrier in short TTI2, it will subsequently perform UL data transmission on the second carrier in long TTI2.

FIG. 21 shows another example showing the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG. The only difference between Figures 20 and 21 is the use of different frame structures. In FIG. 21, UL scheduling and UL data transmission have the same relationship as described above with reference to FIG. 20, so this will not be detailed here.

In a third embodiment of method 1700, the user equipment, in the DL control region of the long TTI on the second carrier, UL scheduling grant for UL data transmission on the first carrier and and a UL scheduling grant for UL data transmission. According to the received scheduling grant, the user equipment may perform UL data transmission on the first carrier in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding UL scheduling grant was received have the relationship n _long = floor((n _short −1)/2), where n _long is an integer . Also, the user equipment may perform UL data transmission on the second carrier in the long TTI immediately following the long TTI in which the corresponding UL scheduling grant was received.

FIG. 22 shows an example illustrating the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG. 1 according to the third embodiment of method 1700. In FIG.

As shown, the user equipment receives an UL scheduling grant for UL data transmission on the first carrier in long TTI0, and similarly in long TTI0 for UL data transmission on the second carrier. may subsequently perform UL data transmission on the first carrier in short TTI1 and/or short TTI2 and UL data transmission on the second carrier in long TTI1. Data transmission may be executed. Subsequently, if the user equipment receives another UL scheduling grant for UL data transmission on the first carrier in long TTI1, then in short TTI3 and/or short TTI4 on the first carrier UL data transmission may be performed, in long TTI2, UL data transmission on the second carrier may be performed, and so on.

FIG. 23 shows another example showing the relationship between UL scheduling and UL data transmission when using the frame structure shown in FIG. The only difference between Figures 23 and 22 is the use of different frame structures. In FIG. 23, UL scheduling and UL data transmission have the same relationship as described above with reference to FIG. 22, so this will not be detailed here.

Note that the examples shown in FIGS. 18-23 are provided for illustrative purposes only and are not intended to be any limitation of the present disclosure.

FIG. 24 shows a flowchart of a method 2400 for sending HARQ feedback, according to some embodiments of the present disclosure. Method 2400 includes at least one component carrier on which short TTI is applied (hereinafter referred to as "first carrier") and at least one component carrier on which long TTI is applied (hereinafter referred to as "second carrier"). ) and in a wireless communication system supporting carrier aggregation, the base station to send HARQ feedback for UL data transmission to the user equipment. Each long TTI and short TTI may include a DL control region, a UL control region, and a data transmission region, but not necessarily in that order. As an example, the DL control region may be used by the base station to send HARQ feedback to the user equipment. The data transmission region may be used by user equipment to transmit UL data transmissions to the base station.

As shown, method 2400 begins at block 2410, where a base station transmits data in a short TTI data transmission region on a first carrier and in a long TTI data transmission region on a second carrier. In the transmission area, it receives UL data transmissions from user equipments.

In block 2420, the base station either in the DL control region of the short TTI on the first carrier or in the DL control region of the long TTI on the second carrier or the short TTI and the second carrier on the first carrier. HARQ feedback for received UL data transmissions is sent to the user equipment in both DL control regions of the long TTI on 2 carriers.

In a first embodiment of method 2400, the base station may request a UL data transmission received on a first carrier immediately after or two short TTIs after the short TTI in which the UL data transmission is received. HARQ feedback may be sent on the first carrier. Similarly, the base station may provide HARQ feedback for the UL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the UL data transmission was received, in the second You can send it on your carrier.

FIG. 25 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG. 1 according to the first embodiment of method 2400 .

As shown, the base station provides HARQ feedback for the UL data transmission received on the first carrier in two short TTIs after the short TTI in which the UL data transmission was received, the first carrier, and HARQ feedback for the UL data transmission received on the second carrier in two long TTIs after the long TTI in which the UL data transmission was received. may be sent on any carrier.

Specifically, as shown, if the base station receives a UL data transmission on the first carrier in short TTI0, then in short TTI2, the UL data transmission on the first carrier is may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI3. good. For UL data transmission on the second carrier, the base station receives UL data transmission on the second carrier in long TTI0, followed by UL data transmission on the second carrier in long TTI2. HARQ feedback for transmission may be sent. Then, if the base station receives UL data transmission on the second carrier in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI3. good.

FIG. 26 shows two other examples showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG. 2 according to the first embodiment of method 2400 .

As shown, the base station provides HARQ feedback for the UL data transmission received on the first carrier immediately after or two short TTIs after the short TTI in which the UL data transmission was received: for the UL data transmission received on the second carrier either immediately after or two long TTIs after the long TTI in which the UL data transmission was received. HARQ feedback may be sent on the second carrier.

In the example shown in FIG. 26( a ), if the base station receives UL data transmission on the first carrier in short TTI0, then in short TTI2, the UL data transmission on the first carrier is may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI3. good. For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the second carrier in long TTI2. may be sent. Then, if the base station receives a UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI3.

In the example shown in FIG. 26(b), if the base station receives UL data transmission on the first carrier in short TTI0, then in short TTI1, the UL data transmission on the first carrier is may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI2. good. For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the second carrier in long TTI1. may be sent. Then, if the base station receives a UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI2.

In a second embodiment of method 2400, the base station for the UL data transmission received on the first carrier immediately after or two short TTIs after the short TTI in which the UL data transmission is received. HARQ feedback may be sent on the first carrier.

To send HARQ feedback on the first carrier for UL data transmissions received on the second carrier, there are two alternative options as follows.
• The base station may send HARQ feedback in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the UL data transmission was received have the relationship n _short =2*(n _long +1)+1, where n _long is an integer. or
• The base station may send HARQ feedback in short TTIs with index n _short . The index n _short and the index n _long of the long TTI in which the UL data transmission was received have the relationship n _short =2*(n _long +1), where n _long is an integer.

FIG. 27 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG.

As shown, the base station provides HARQ feedback for the UL data transmission received on the first carrier in two short TTIs after the short TTI in which the UL data transmission was received, the first It may be transmitted on the carrier, and HARQ feedback for the UL data transmission received on the second carrier in a short TTI with index n _short may be transmitted on the first carrier. good. The index n _short and the index n _long of the long TTI in which the UL data transmission was received have the relationship n _short =2*(n _long +1)+1, where n _long is an integer.

Specifically, as shown, if the base station receives a UL data transmission on the first carrier in short TTI 0, then in short TTI 2, the base station receives a UL data transmission on the first carrier. may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI3. good. For UL data transmission on the second carrier, if the base station receives UL data transmission in long TTI0, then in short TTI3, HARQ feedback for UL data transmission on the first carrier may be sent. Then, if the base station receives a UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in long TTI5.

FIG. 28 shows two further examples showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG. 2 according to the second embodiment of method 2400.

As shown, the base station provides HARQ feedback for the UL data transmission received on the first carrier immediately after or two short TTIs after the short TTI in which the UL data transmission was received: May transmit on the first carrier, and transmit HARQ feedback for the UL data transmission received on the second carrier in a short TTI with index n _short on the first carrier. You can The index n _short and the index n _long of the long TTI in which the UL data transmission was received have the relationship n _short =2*(n _long +1)+1, where n _long is an integer or n We have the relation _short = 2*(n _long +1), where n _long is an integer.

In the example shown in FIG. 28( a ), if the base station receives a UL data transmission on the first carrier in short TTI 0 , then in short TTI 2 , the UL data transmission on the first carrier is may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI3. good. For UL data transmission on the second carrier, if the base station receives UL data transmission in long TTI0, then in short TTI3, HARQ feedback for UL data transmission on the first carrier may be sent. Then, if the base station receives a UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI5.

In the example shown in FIG. 28(b), if the base station receives UL data transmission on the first carrier in short TTI0, then in short TTI1, the base station receives UL data transmission on the first carrier. may send HARQ feedback for Then, if the base station receives UL data transmission on the first carrier in short TTI1, it may subsequently send HARQ feedback for UL data transmission on the first carrier in short TTI2. good. For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the first carrier in short TTI2. may be sent. Then, if the base station receives the UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the first carrier in short TTI4.

In a third embodiment of method 2400, the base station for the UL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the UL data transmission was received. HARQ feedback may be sent on the second carrier.

There are two alternative options for sending HARQ feedback on the second carrier for UL data transmissions received on the first carrier:
• The base station may send HARQ feedback in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the UL data transmission was received have the relationship n _long = floor((n _short +1)/2)+1, where n _short is an integer. or
• The base station may send HARQ feedback in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the UL data transmission was received have the relationship n _long =floor(n _short /2)+1, where n _short is an integer.

FIG. 29 shows an example showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG. 1 according to the third embodiment of method 2400 .

As shown, the base station provides HARQ feedback for the UL data transmission received on the second carrier in two long TTIs after the long TTI in which the UL data transmission was received, on the second It may be transmitted on the carrier, and HARQ feedback for the UL data transmission received on the first carrier in a long TTI with index n _long may be transmitted on the second carrier. good. The index n _long and the index n _short of the short TTI in which the UL data transmission was received have the relationship n _long = floor((n _short +1)/2)+1, where n _short is an integer.

Specifically, as shown, if the base station receives a UL data transmission on the first carrier in short TTI 0, followed by a UL data transmission on the second carrier in long TTI 1: may send HARQ feedback for Thereafter, if the base station receives UL data transmission on the first carrier in short TTI1 or short TTI2, then in long TTI2 it sends HARQ feedback for UL data transmission on the second carrier. You can For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the second carrier in long TTI2. may be sent. Then, if the base station receives UL data transmission on the second carrier in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI3. good.

FIG. 30 shows two other examples showing the relationship between UL data transmissions and HARQ feedback transmissions when using the frame structure shown in FIG. 2 according to the first embodiment of method 2400.

As shown, the base station provides HARQ feedback for the UL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the UL data transmission was received, may transmit on a second carrier, and transmit HARQ feedback for UL data transmissions received on the first carrier in a long TTI with index n _long on the second carrier; You can The index n _long and the index n _short of the short TTI in which the UL data transmission was received have the relationship n _long = floor((n _short +1)/2)+1, where n _short is an integer, or Or have the relationship n _long =floor(n _short /2)+1, where n _short is an integer.

In the example shown in FIG. 30(a), if the base station receives UL data transmission on the first carrier in short TTI0, then in long TTI1, the UL data transmission on the second carrier is may send HARQ feedback for Thereafter, if the base station receives UL data transmission on the first carrier in short TTI1 or short TTI2, then in long TTI2 it sends HARQ feedback for UL data transmission on the second carrier. You can For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the second carrier in long TTI2. may be sent. Then, if the base station receives UL data transmission on the second carrier in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI3. good.

In the example shown in FIG. 30(b), if the base station receives a UL data transmission on the first carrier in short TTI0 or short TTI1, then in long TTI1, the UL data transmission on the second carrier is HARQ feedback for data transmission may be sent. Thereafter, if the base station receives UL data transmission on the first carrier in short TTI2 or short TTI3, then in long TTI2 it sends HARQ feedback for UL data transmission on the second carrier. You can For UL data transmission on the second carrier, the base station receives UL data transmission in long TTI0, followed by HARQ feedback for UL data transmission on the second carrier in long TTI1. may be sent. Then, if the base station receives a UL data transmission in long TTI1, it may subsequently send HARQ feedback for the UL data transmission on the second carrier in long TTI2.

Note that the examples shown in FIGS. 25-30 are provided for illustrative purposes only and are not intended to be any limitation of the present disclosure.

FIG. 31 supports carrier aggregation of at least one first carrier with short TTI and at least one second carrier with long TTI, according to some embodiments of the present disclosure FIG. 31 shows a schematic block diagram of an apparatus 3100 for performing data transmission to user equipment in a communication system. Apparatus 3100 may be embodied as a base station or at least part of a base station.

Specifically, apparatus 3100 comprises scheduler 3110 and transmitter 3120 . A scheduler 3110 is configured to transmit at least one DL scheduling grant corresponding to data transmission to the user equipment in at least one DL control region of a short TTI on a first carrier and a long TTI on a second carrier. Configured. The transmitter 3120 transmits data to the user equipment in the short TTI data transmission region on the first carrier and in the long TTI data transmission region on the second carrier, as indicated by the at least one DL scheduling grant. configured to perform DL data transmission;

In one embodiment, the scheduler 3110 transmits DL scheduling grants corresponding to data transmissions on the first carrier in the DL control region for short TTIs on the first carrier and for long TTIs on the second carrier. It may be configured to transmit DL scheduling grants corresponding to data transmissions on the second carrier in the DL control region. transmitter 3120 performs DL data transmission on the first carrier in the short TTI in which the corresponding DL scheduling grant was sent or in the short TTI immediately following the short TTI in which the corresponding DL scheduling grant was sent; configured to perform DL data transmission on the second carrier in the long TTI in which the corresponding DL scheduling grant was transmitted or in the long TTI immediately following the long TTI in which the corresponding DL scheduling grant was transmitted Also good.

In another embodiment, the scheduler 3110 transmits DL scheduling grants corresponding to data transmissions on the second carrier in the DL control region of short TTIs on the first carrier and short TTIs on the first carrier. DL control region may be configured to transmit DL scheduling grants corresponding to data transmission on the first carrier. transmitter 3120 performs DL data transmission on the first carrier in the short TTI in which the corresponding DL scheduling grant was sent or in the short TTI immediately following the short TTI in which the corresponding DL scheduling grant was sent; It may be configured to perform DL data transmission on the second carrier in the long TTI with index n _long . The index n _long and the index n _long of the short TTI in which the corresponding DL scheduling grant was sent have the relationship n _long =n _short /2, where n _short is an even number.

In yet another embodiment, the scheduler 3130 provides, in the DL control region of the long TTI on the second carrier, a DL scheduling grant corresponding to data transmission on the second carrier and a and the corresponding DL scheduling grant. transmitter 3120 performs DL data transmission on the second carrier in the long TTI in which the corresponding DL scheduling grant was sent or in the long TTI immediately following the long TTI in which the corresponding DL scheduling grant was sent; It may be configured to perform DL data transmission on the first carrier in the short TTI with index n _short . The index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long =floor(n _short /2), where n _short is an integer. Or, the index n _short and the index n _long of the long TTI in which the corresponding DL scheduling grant was sent have the relationship n _long = floor((n _short −1)/2), where n _short is an integer is.

The scheduler 3110 and transmitter 3120 described above may be configured to perform the corresponding operations or steps described with reference to FIGS. 3-9, which are not detailed here for the sake of brevity.

FIG. 32 supports carrier aggregation of at least one first carrier with short TTI and at least one second carrier with long TTI, according to some embodiments of the present disclosure 32 shows a schematic block diagram of an apparatus 3200 for sending HARQ feedback to a base station in a communication system. Device 3200 may be embodied as a user device or at least part of a user device.

Specifically, device 3200 comprises receiver 3210 and transmitter 3220 . Receiver 3210 is configured to receive DL data transmissions from the base station in the long TTI data transmission region on the second carrier and in the short TTI data transmission region on the first carrier. A transmitter 3220 sends HARQ feedback for received DL data transmissions in the UL control region of at least one of the short TTI on the first carrier and the long TTI on the second carrier to the base station. configured as

In one embodiment, transmitter 3220 provides HARQ feedback for the DL data transmission received on the first carrier in a short TTI immediately after or two short TTIs after the short TTI in which the DL data transmission is received. It may be configured to transmit on one carrier.

In a further embodiment, transmitter 3220 provides HARQ feedback for the DL data transmission received on the second carrier in a long TTI immediately after or two long TTIs after the long TTI in which the DL data transmission was received. It may be configured to transmit on two carriers.

In another embodiment, transmitter 3220 is configured to transmit, on a first carrier, HARQ feedback for DL data transmissions received on a second carrier in any of the following short TTIs: May be. The short TTI of index n _short (index n _short and the index n _long of the long TTI in which the DL scheduling grant was received has the relationship n _short =2*(n _long +1)+1, where n _long is an integer is). Or, the short TTI with index n _short (index n _short and index n _long of the long TTI in which the DL scheduling grant was received has the relationship n _short =2*(n _long +1), where n _long is integer).

In yet another embodiment, the transmitter 3220 provides HARQ feedback for the DL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the DL data transmission was received. , on a second carrier, and configured to transmit, on the second carrier, HARQ feedback for DL data transmissions received on the first carrier in long TTIs of index n _long . May be. The index n _long and the index n _short of the short TTI in which the DL scheduling grant was received have the relationship n _long =floor(n _short /2)+1, where n _short is an integer.

In yet another embodiment, transmitter 3220 transmits, on the first carrier, HARQ feedback for the DL data transmission received on the first carrier in the short TTI in which the DL data transmission was received. It may be configured as follows.

In a further embodiment, transmitter 3220 transmits, on the second carrier, HARQ feedback for the DL data transmission received on the second carrier in the long TTI in which the DL data transmission was received, and index In short TTIs of n _short , HARQ feedback for DL data transmissions received on the second carrier may be configured to be sent on the first carrier. The index n _short and the index n _long of the long TTI in which the DL scheduling grant was received have the relationship n _short =2*n _long +1, where n _long is an integer.

In yet another embodiment, transmitter 3220 transmits, on a second carrier, HARQ feedback for DL data transmissions received on the second carrier in the long TTIs in which the DL data transmissions were received. , on the second carrier, HARQ feedback for DL data transmissions received on the first carrier in long TTIs with index n _long . The index n _long and the index n _short of the short TTI in which the DL scheduling grant was received have the relationship n _long =floor((n _short -1)/2)+1, where n _long is an integer.

The receiver 3210 and transmitter 3220 described above may be configured to perform the corresponding operations or steps described with reference to FIGS. 10-16, but are not detailed here for the sake of brevity.

FIG. 33 illustrates data transmission to a base station in a communication system supporting carrier aggregation of at least one first carrier with short TTI and at least one second carrier with long TTI. shows a schematic block diagram of an apparatus 3300 for performing . Device 3300 may be embodied as a user device or at least part of a user device.

Specifically, device 3300 comprises receiver 3310 and transmitter 3320 . A receiver 3310 receives at least one UL scheduling grant for data transmission to a base station in at least one DL control region of a short TTI on a first carrier and a long TTI on a second carrier. Configured. The transmitter 3320 transmits data to the base station in the short TTI data transmission region on the first carrier and in the long TTI data transmission region on the second carrier, as indicated by the at least one UL scheduling grant. configured to perform UL data transmission;

In one embodiment, the receiver 3310 receives UL scheduling grants for data transmission on the first carrier in the DL control region for short TTIs on the first carrier and long TTIs on the second carrier. It may be configured to receive UL scheduling grants for data transmission on the second carrier in the DL control region. Transmitter 3320 performs UL data transmission on the first carrier in the short TTI immediately following the short TTI in which the corresponding UL scheduling grant is received and in the long TTI immediately following the long TTI in which the corresponding UL scheduling grant is received. It may be configured to perform UL data transmission on the second carrier in the TTI.

In another embodiment, the receiver 3310 receives a UL scheduling grant for data transmission on the first carrier in the DL control region of the short TTI on the first carrier and receives a short TTI on the first carrier. DL control region may be configured to receive UL scheduling grants for data transmission on the second carrier. Transmitter 3320 performs UL data transmission on the first carrier in the short TTI immediately following the short TTI in which the corresponding uplink scheduling grant was received, and on the second carrier in the long TTI with index n _long . It may be configured to perform UL data transmission. The index n _long and the index n _short of the short TTI in which the corresponding UL scheduling grant was received have the relationship n _long = n _short /2, where n _short is even or n _long = It has a relationship of 1+n _short /2, where n _short is even.

In yet another embodiment, the receiver 3310 provides UL scheduling grant for data transmission on the first carrier and UL scheduling grant for data transmission on the second carrier in the DL control region of the long TTI on the second carrier. and UL scheduling grants for Transmitter 3320 transmits a short TTI of index n _short (where index n _short and index n _long of the long TTI in which the corresponding UL scheduling grant was received is n _long =floor((n _short −1)/2) , where n _long is an integer), and perform UL data transmission on the first carrier on the second carrier in the long TTI immediately following the long TTI in which the corresponding UL scheduling grant was received. UL data transmission may be performed.

The receiver 3310 and transmitter 3320 described above may be configured to perform the corresponding operations or steps described with reference to FIGS. 17-23, but are not detailed here for the sake of brevity.

FIG. 34 illustrates HARQ feedback to a user equipment in a communication system supporting carrier aggregation of at least one first carrier with short TTI and at least one second carrier with long TTI. FIG. 34 shows a schematic block diagram of an apparatus 3400 for transmitting. Apparatus 3400 may be embodied as a base station or at least part of a base station.

Specifically, the apparatus comprises receiver 3410 and transmitter 3420 . The receiver 3410 is configured to receive UL data transmissions from the user equipment in the long TTI data transmission region on the second carrier and in the short TTI data transmission region on the first carrier. A transmitter 3420 sends HARQ feedback for received UL data transmissions in the DL control region of at least one of the short TTI on the first carrier and the long TTI on the second carrier to the user equipment. configured as

In one embodiment, the transmitter 3420 provides HARQ feedback for the UL data transmission received on the first carrier in a short TTI immediately after or two short TTIs after the short TTI in which the UL data transmission is received. It may be configured to transmit on one carrier. Further, the transmitter 3420 may transmit HARQ feedback for the UL data transmission received on the second carrier in a long TTI immediately after or two long TTIs after the long TTI in which the UL data transmission was received. above, and may be configured to transmit.

In another embodiment, transmitter 3420 is configured to transmit, on a first carrier, HARQ feedback for UL data transmissions received on a second carrier in any of the following short TTIs: May be. The short TTI of index n _short (index n _short and index n _long of the long TTI in which the UL scheduling grant was received has the relationship n _short =2*(n _long +1)+1, where n _long is an integer is). Or, the short TTI with index n _short (index n _short and index n _long of the long TTI in which the UL scheduling grant was received has the relationship n _short =2*(n _long +1), where n _long is integer).

In yet another embodiment, transmitter 3420 provides HARQ feedback for the UL data transmission received on the second carrier immediately after or two long TTIs after the long TTI in which the UL data transmission was received. , on the second carrier, and transmit on the second carrier HARQ feedback for UL data transmissions received on the first carrier in any of the following long TTIs: may be configured. A long TTI of index n _long (index n _long and index n _short of the short TTI in which the UL data transmission was received has the relationship n _long =floor((n _short +1)/2)+1, where n _short is an integer). Or, the long TTI with index n _long (index n _long and index n _short of the short TTI in which the UL data transmission was received has the relationship n _long =floor(n _short /2)+1 and n _short is an integer).

The receiver 3410 and transmitter 3420 described above may be configured to perform the corresponding operations or steps described with reference to FIGS. 24-30, which are not detailed here for the sake of brevity.

FIG. 35 is a schematic block diagram of an apparatus 3500 for performing data transmission according to some embodiments of the present disclosure or for transmitting HARQ feedback according to some other embodiments of the present disclosure is shown. Apparatus 3500 may be embodied as a base station or at least part of a base station. Alternatively, device 3500 may be embodied as a user device or at least part of a user device.

Apparatus 3500 comprises at least one processor 3510 such as a data processor (DP) and at least one memory (MEM) 3520 coupled to processor 3510 . Apparatus 3500 may further comprise a transmitter TX and receiver RX 3530 coupled to processor 3510 for establishing wireless communication with other devices. MEM 3520 stores program (PROG) 3540 . PROG 3540 includes instructions that, when executed on an associated processor 3510, cause apparatus 3500 to operate in accordance with some embodiments of the present disclosure, such as performing methods 300, 1000, 1700 or 2400 described above. But it's okay. The combination of at least one processor 3510 and at least one MEM 3520 may form processing means 3550 configured to implement some embodiments of the present disclosure.

The MEM 3520 can be of any type suitable for the local technology environment, non-limiting examples include semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. may be implemented using any suitable data storage technology such as

Processor 3510 may be of any type suitable for the local technology environment, and non-limiting examples include general purpose computers, special purpose computers, microprocessors, digital signal processors DSPs, and processors based on multi-core processor architectures. But it's okay.

Additionally, the present disclosure may provide a carrier, which is one of an electrical signal, an optical signal, a radio signal, or a computer-readable medium, containing the computer program described above. The computer readable medium can be, for example, random access memory (RAM), read only memory (ROM), flash memory, magnetic tape, optical compact discs such as CD-ROMs, DVDs, and Blue-ray discs, or electronic memory devices. obtain.

The techniques described herein can be implemented by various means, and an apparatus that performs one or more functions of the corresponding apparatus described in one embodiment can be implemented not only by means of the prior art, but also by one It also comprises means for performing one or more functions of the corresponding apparatus described in the embodiments, which may be separate means for separate functions or means configured to perform two or more functions. can be provided. For example, these techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or combinations thereof. With firmware or software, implementation can be through modules (eg, procedures, functions, and so on) that perform the functions described herein.

The embodiments herein are described above with reference to block diagrams and flowchart illustrations of methods and apparatus. It will be understood that each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, respectively, can be implemented by various means including computer program instructions. These computer program instructions can be a general purpose computer, special purpose computer, or other computer program instructions executed on a computer or other programmable data processing apparatus to produce the means for performing the functions identified in the flowchart blocks. It can be loaded onto a programmable data processing device to generate a machine.

Although this specification contains many specific implementation details, these should not be construed as limitations on the scope of implementation or what may be claimed, rather than specific implementation details of particular implementations. It should be construed as a description of features that may be unique to the embodiments. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Further, features are described above as working in particular combinations, and even if originally claimed as such, one or more features from the claimed combination may in some cases be cut from the combination. and claimed combinations may be directed to sub-combinations or variations of sub-combinations.

It will be apparent to those skilled in the art that as technology advances, the inventive concept can be implemented in various ways. The above-described embodiments are provided to illustrate rather than limit the disclosure, and modifications and variations are possible without departing from the spirit and scope of the disclosure, as those skilled in the art will readily appreciate. It should be understood that Such modifications and variations are considered to come within the scope of the disclosure and appended claims. The protection scope of the present disclosure is defined by the attached claims.

Claims (6)

A method performed by a user device, comprising:
receiving a downlink scheduling grant corresponding to a downlink data transmission in a short time interval unit of a first carrier;
receiving the downlink data transmission in long time interval units on a second carrier;
transmitting Hybrid Automatic Repeat reQuest (HARQ) feedback corresponding to the downlink data transmission in the same time interval unit as the downlink data transmission was received;
including
the long time interval unit is determined according to a ratio of the length of the short time interval unit for which the corresponding downlink scheduling grant was received to the length of the long time interval unit;
Method. A method performed by a user device, comprising:
receiving a downlink scheduling grant corresponding to a downlink data transmission in a first carrier long time interval unit;
receiving the downlink data transmission in short time intervals on a second carrier;
transmitting Hybrid Automatic Repeat reQuest (HARQ) feedback corresponding to the downlink data transmission in the same time interval unit as the downlink data transmission was received;
including
the short time interval unit is determined according to a ratio of the length of the long time interval unit for which the corresponding downlink scheduling grant was received to the length of the short time interval unit;
Method. A method performed by a network device, comprising:
transmitting a downlink scheduling grant corresponding to the downlink data transmission in a short time interval unit of the first carrier;
transmitting the downlink data transmission in long time interval units on a second carrier;
receiving Hybrid Automatic Repeat reQuest (HARQ) feedback corresponding to the downlink data transmission in the same time interval unit as the time interval unit in which the downlink data transmission was sent;
including
the long time interval unit is determined according to a ratio of the length of the short time interval unit in which the corresponding downlink scheduling grant was transmitted to the length of the long time interval unit;
Method. A method performed by a network device, comprising:
transmitting a downlink scheduling grant corresponding to the downlink data transmission in a first carrier long time interval unit;
transmitting the downlink data transmission in short time intervals on a second carrier;
receiving Hybrid Automatic Repeat reQuest (HARQ) feedback corresponding to the downlink data transmission in the same time interval unit as the time interval unit in which the downlink data transmission was sent;
including
the short time interval unit is determined according to a ratio of the length of the long time interval unit in which the corresponding downlink scheduling grant was transmitted to the length of the short time interval unit;
Method. comprising a processor configured to perform the method of claim 1 or 2,
User equipment. comprising a processor configured to perform the method of claim 3 or 4,
network device.

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