JP2020022167A - Data transmission method, terminal, and base station - Google Patents

Abstract

To disclose a data transmission method, a terminal, and a base station and provide a method capable of executing a transmission of feedback information in a scene that an unlicensed carrier wave is independently operated.SOLUTION: A method includes the steps of: determining M time units for an up-link transmission in the unlicensed carry wave by a terminal and N time units for a down-link transmission in an unlicensed carry wave (both of M and N are positive integers) and receiving down-link data transmitted from a base station by the terminal at the N time units; transmitting feedback information corresponding to the down-link data of K time units of a top in the N time units to the base station by a first time unit in the M time units by the terminal (K is a positive integer of N or less), and including that the first time unit is positioned at a position rear from the K time units of the top, and a difference of a start time point of the first time unit and the start time point of the last time unit in the K time units of the top is a feedback process delay of a system or more.SELECTED DRAWING: Figure 9

Description

  The present invention relates to the field of communications, and more specifically, to a data transmission method, a terminal, and a base station.

  A physical downlink shared channel (PDSCH: Physica1 Downlink Share Channel 1) in a long term evolution (LTE) system supports a hybrid automatic repeat request (HARQ: Hybrid Automatic Repeat Request) function. After establishing a communication connection with the base station, the terminal receives downlink control signaling (DCI: Downlink control 1) and transmits scheduling information (eg, physical resource position and quantity, content of modulation coding level, etc.) corresponding to PDSCH. Can be included). The terminal receives the PDSCH based on the scheduling information, and demodulates and decodes a transport block (TB: Transport Block) carried therein. If the decoding result is correct, the terminal can feed back ACK (Acknowledgment) information to the base station. If the decoding result is an error, the terminal can feed back NACK (Negative Acknowledgement) information to the base station so that the base station retransmits the TB.

  The ACK information or the NACK information may be transmitted via a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).

  On the other hand, the LTE system uses carrier aggregation (CA) technology to realize bandwidth expansion, that is, aggregates a plurality of LTE carrier (CC: Component Carrier) to increase the transmission bandwidth. Can be realized. In contrast to the carrier aggregation technique, a license assisted access (LAA) technique is provided in the related art to realize the aggregation of the license carrier and the unlicensed carrier.

  In subsequent improvements, the unlicensed carrier may operate independently, independent of the licensed carrier, i.e., the terminal may obtain complete system information only on the unlicensed carrier, complete uplink and downlink synchronization, scheduling It can receive information, receive downlink data, transmit uplink data, transmit necessary feedback information, and so on. At present, there has been no clear solution on which process achieves independent operation of the LTE system on an unlicensed carrier. Here, there is no corresponding solution for how to transmit the feedback information.

  Embodiments of the present invention provide a data transmission method, a terminal, and a base station, and can transmit feedback information using an unlicensed carrier.

According to a first aspect, there is provided a data transmission method, the method comprising:
The terminal determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer; N is a positive integer;
The terminal receives downlink data transmitted from the base station in the N time units;
The terminal transmits feedback information corresponding to downlink data of the first K time units in the N time units to the base station in a first time unit in the M time units, wherein: , K is a positive integer equal to or less than N, and the first time unit is located after the first K time units, and at the start time of the first time unit and the first K time units. The difference from the start time of the last time unit is greater than or equal to the feedback processing delay of the system.

In a possible embodiment of the first aspect, the method comprises:
The terminal receives indication information at the start of the N time units, and the indication information indicates the N time units for downlink transmission and the M time units for uplink transmission. It is further included that it is used especially for.

In a possible embodiment of the first aspect, the terminal transmits to the base station the downlink data of the first K time units of the N time units in the first time unit of the M time units. Sending feedback information corresponding to
The terminal generates cascaded C × K bit information according to the time unit order and uses the information as feedback information, where C is the maximum number of codewords supported by downlink transmission of the system;
The terminal transmitting the feedback information to the base station in the first time unit.

According to a second aspect, there is provided a data transmission method, the method comprising:
The base station determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer. , N is a positive integer, and
The base station transmits downlink data to the terminal in the N time units;
The base station receives feedback information corresponding to the first K time unit downlink data in the N time units transmitted from the terminal in a first time unit in the M time units. Where K is a positive integer equal to or less than N, the first time unit is located after the first K time units, and the start time of the first time unit and the first K time units are The difference between the start time of the last time unit and the start time of the last time unit is equal to or more than the feedback processing delay of the system.

In a possible embodiment of the second aspect, the method comprises:
The base station transmits indication information to a terminal at the start of the N time units, where the indication information is the N time units for downlink transmission and the M time periods for uplink transmission. It further includes being used to indicate a unit.

  In a possible embodiment of the second aspect, the feedback information is C × K bit information cascaded according to time unit order, where C is the maximum number of codewords supported by the downlink transmission of the system. is there.

In a possible embodiment of the second aspect, the method comprises:
The method further includes the base station setting a guard period for the uplink transmission and the downlink transmission.

  According to a third aspect, a terminal is provided, comprising a determination module, a receiving module and a transmitting module, configured to execute corresponding embodiments of the first and second aspects.

  According to a fourth aspect, a terminal is provided, comprising a processor, a receiver, a transmitter and a memory, configured to execute corresponding embodiments of the first and second aspects, and Each member of the terminal according to the third aspect can correspond to a corresponding module of the terminal according to the third aspect.

  According to a fifth aspect, a base station is provided, comprising a determining module, a transmitting module and a receiving module, configured to perform corresponding embodiments of the first and second aspects.

  According to a sixth aspect, a base station is provided, comprising a processor, a receiver, a transmitter and a memory, configured to perform corresponding embodiments of the first and second aspects, and Each member of the base station according to the sixth aspect can correspond to a corresponding module of the base station according to the fifth aspect.

  In the first to sixth aspects and corresponding embodiments, a possible solution is that the first time unit is the last time unit in the M time units.

In a first aspect to a sixth aspect and corresponding embodiments, as another possible solution, if the length of the M time units is greater than or equal to the feedback processing delay, the first time unit may be A first time unit after the feedback processing delay, based on the last time unit in the N time units,
If the length of the M time units is less than the feedback processing delay, the first time unit is the last time unit in the M time units.

  Here, the downlink data includes at least one of broadcast information, a synchronization signal, a reference signal, downlink control signaling, and downlink service data.

  Here, the downlink control signaling includes scheduling information, and the scheduling information is used for scheduling the M time-based uplink transmissions.

  As a possible solution, the scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units may be used to schedule one time unit uplink transmission in the M time units. Used.

  As another possible solution, the scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units schedules a plurality of time unit uplink transmissions in the M time units. Used for

  Preferably, the time unit may be a subframe or a time slot.

  Preferably, the M time units are continuous time units, the N time units are continuous time units, and the N time units and the M time units are continuous. Time units, where the N time units precede the M time units.

  Based on the above technical solution, in the data transmission method, the terminal and the base station according to the embodiment of the present invention, a feasible method of transmitting feedback information in a scene operating independently on an unlicensed carrier is provided and improved. By transmitting feedback information corresponding to a plurality of time units for downlink transmission within one time unit for link transmission, feedback efficiency can be improved.

FIG. 2 is a schematic diagram of an LTE carrier aggregation technology. FIG. 4 is a schematic diagram of a time unit for transmitting feedback information according to an embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a time unit for transmitting feedback information according to another embodiment of the present invention. 4 is a schematic flowchart of a data transmission method according to one embodiment of the present invention. 9 is a schematic flowchart of a data transmission method according to another embodiment of the present invention. FIG. 3 is a schematic block diagram of a terminal according to one embodiment of the present invention. FIG. 10 is a schematic block diagram of a terminal according to another embodiment of the present invention. FIG. 3 is a schematic block diagram of a base station according to one embodiment of the present invention. FIG. 9 is a schematic block diagram of a base station according to another embodiment of the present invention.

  In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings necessary for describing the embodiments or the prior art will be briefly described below. Only some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

  Hereinafter, the technical solutions according to the embodiments of the present invention will be clearly and fully described with reference to the drawings of the embodiments of the present invention. And not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

  As used herein, the terms "member," "module," "system," and the like, refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or running software. Used. For example, a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. As shown in the figures, an application running on a computing device and the computing device may be a component. One or more components may reside in a process and / or execution thread, and components may be located on one computer or distributed between two or more computers. Also, these components may execute on the various computer readable media described above that store various data structures. A member may, for example, include one or more groups of data (eg, data from two members interacting with another member between a local system, a distributed system and / or a network, eg, the Internet, which interacts with other systems via signals). Communication can be by local and / or remote processes based on the signals that it has.

  It should be understood that the technical solutions in the embodiments of the present invention are various communication systems, for example, a Global System of Mobile Communication (GSM) system, a Code Division Multiple Access (CDMA) system. , A wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS) system, a long term evolution type (LTE: Long Term Emulsion DTE system, Long Term Evolution DTE system) ： Frequency Division Duplex) System, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), Worldwide Wireless Access (WiMAX) And 5G communication systems in the future.

  Each embodiment of the present invention will be described in combination with a terminal. The terminal can communicate with one or more core networks via a radio access network (RAN), the terminal can be a user equipment (UE), an access terminal, a subscriber unit, a subscriber site, It may be a mobile site, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The access terminal has a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) site, a personal digital processing (PDA: Personal1 Assistant1), and a wireless communication function. It may be a handheld device, a computing device or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a future 5G network, or the like.

  The present invention will be described with reference to each embodiment in combination with a base station. The base station may be a device for communicating with a terminal, such as a base station (BTS: Base Transceiver Station) in a GSM system or CDMA, a base station (NB: NodeB) in a WCDMA system, and an evolved base station in an LTE system. (ENB or eNodeB: Evolutional NodeB), or the base station may be a relay station, an access point, an in-vehicle device, a wearable device, and a network-side device in a future 5G network.

  Hereinafter, related technologies and concepts according to embodiments of the present invention will be briefly described.

Carrier aggregation technology With the development of communication technology, long-term evolution technology upgrade (LTE-Advanced, LTE-A) technology evolves from LTE technology. In the Release 10 system of LTE-A, bandwidth extension is realized by using CA technology, that is, a maximum of five LTE carriers CC1 to CC5 shown in FIG. Can be realized. Depending on the capability of the terminal and the amount of data it transmits, the base station can set the number of carriers that it aggregates and transmits for each terminal, and the aggregated carriers are called member carriers. Is also good.

  For one terminal, the aggregated member carriers include: (1) A primary carrier (PCell: Primary Cell), in which there is only one primary carrier, the terminal performs an initial connection establishment process or a start connection re-establishment process on the primary carrier, and the terminal uses only the primary carrier to transmit the PDCCH. The terminal receives the common search space and transmits the PUCCH only on the primary carrier. (2) A sub-carrier (SCell: Secondary Cell) in which all member carriers other than the main carrier are sub-carriers, and the terminal receives DCI and PDSCH on the sub-carrier and transmits PUSCH on the sub-carrier. it can.

  The method, the terminal and the base station according to the embodiment of the present invention may be applied to a scene that operates without using a license carrier and independently using an unlicensed carrier (this scene will be described below as an example). Also, the present invention may be applied to the above-described carrier aggregation scene, and is not limited thereto in the embodiment of the present invention.

Feedback of ACK information or NACK information After establishing a communication connection with the base station, the terminal receives DCI and receives scheduling information corresponding to the PDSCH (for example, it may include contents such as physical resource position and quantity, modulation coding level, etc.). Can) get. The terminal receives the PDSCH based on the scheduling information and demodulates and decodes the TB carried therein. If the decoding result is correct, the terminal can feed back ACK information to the base station. If the decoding result is an error, the terminal can feed back NACK information to the base station so that the base station retransmits the TB.

  The ACK information or the NACK information may be transmitted via a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH). If the UE does not transmit the PUSCH in the uplink subframe, the ACK information or NACK transmitted in the subframe can be transmitted only through the PUCCH.

  It should be understood that the feedback information referred to herein may include ACK information and / or NACK information.

  In a scene in which the license carrier is not used and the unlicensed carrier is used independently, the base station and the terminal transmit M time units for uplink transmission on the unlicensed carrier and downlink transmission on the unlicensed carrier. Operate in N time units, where M is a positive integer and N is a positive integer.

  It should be understood that in the embodiment of the present invention, the time unit may be a frame, a subframe, a time slot, or even a symbol, and is not limited in the embodiment of the present invention. Preferably, the time unit is a subframe or a time slot.

  As a preferred design, M time units are continuous time units, N time units are continuous time units, and N time units and M time units are continuous. Time units, where N time units precede M time units. Of course, embodiments of the present invention are not limited to this.

  In the embodiment of the present invention, the M time units and the N time units may be predetermined by the base station and the terminal. More preferably, M and N may be determined by the base station and notified to the terminal.

  Specifically, after determining that the unlicensed carrier is in the idle state, the base station performs data transmission using the unlicensed carrier. Based on the amount of service to be transmitted, the base station determines that the time length dedicated to downlink transmission during the current transmission is N time units and the time length dedicated to uplink transmission is M time periods. Determine the unit. The base station may transmit indication information to the terminal at the start of N time units, where the indication information includes N time units for downlink transmission and M time units for uplink transmission. Used to indicate Correspondingly, the terminal receives the indication information at the start of N time units.

  As described above, whether previously promised or notified via the base station, the terminal and the base station first establish M time units for uplink transmission on the unlicensed carrier and downlink time transmission on the unlicensed carrier. N time units are determined.

  Next, the base station transmits downlink data to the terminal in N time units. The downlink data may include at least one of broadcast information, a synchronization signal, a reference signal, downlink control signaling, and downlink service data.

  In one embodiment, the downlink control signaling can include scheduling information, which is used to schedule M time-based uplink transmissions. Here, as shown in FIG. 2, the scheduling information transmitted in each time unit for uplink transmission scheduling in N time units is used to schedule uplink transmission in one time unit in M time units. It may be used to As shown in FIG. 3, scheduling information transmitted in each time unit for uplink transmission scheduling in N time units is used to schedule uplink transmissions in a plurality of time units in M time units. May be used.

  In other words, the scheduling information transmitted in one time unit for downlink transmission may schedule data transmission in only one time unit for uplink transmission, or may be used for uplink transmission. May be scheduled in a plurality of time units.

  In the examples shown in FIG. 2 and FIG. 3, the scheduling processing delay is described using four time unit lengths as an example. In the prior art, the scheduling delay is typically 4 ms. If the time unit is a subframe, the scheduling delay corresponds to four time units. Naturally, if the scheduling processing delay is not an integer multiple of the length of the time unit, the difference in the number of time units between the time unit for scheduling and the scheduled time unit is obtained by dividing the scheduling processing delay by the length of each time unit. Rounding up the value.

  Next, the terminal transmits the feedback information corresponding to the first K time units of downlink data in the N time units to the base station in the first time unit of the M time units, K is a positive integer less than or equal to N, the first time unit is located after the first K time units, and the start time of the first time unit and the last time in the first K time units Is greater than or equal to the feedback processing delay of the system. In response to this, the base station transmits feedback information corresponding to the first K downlink data in the N time units transmitted from the terminal in the first time unit in the M time units. Receive.

  Also, as one embodiment, as shown in FIGS. 4 and 5, the first time unit may always be the last time unit of the M time units.

  Specifically, K is equal to N if the length of the M time units is greater than or equal to the feedback processing delay.

  As shown in FIG. 4, M and N are both 5, the first time unit is the last time unit in the M time units, and the terminal performs downlink transmission in the first time unit. Feedback information corresponding to downlink data in all (5) time units can be transmitted.

  If the length of the M time units is smaller than the feedback processing delay, the difference in the number of time units between the last time unit in the M time units and the last time unit in the first K time units is , Rounding up a value obtained by dividing the feedback processing delay by the length of each time unit.

  As shown in FIG. 5, N is 7, M is 3, the first time unit is the last time unit in the M time units, and the terminal is in the first time unit for downlink transmission. For example, feedback information corresponding to downlink data in the first six time units can be transmitted. The feedback information corresponding to the downlink data in the seventh time unit for downlink transmission may be transmitted by another method, for example, by transmitting another signaling or another scheduling method, and the like. It is not limited in the embodiment.

  As another embodiment, as shown in FIGS. 6 and 5, when the length of the M time units is equal to or longer than the feedback processing delay, the first time unit is the last of the N time units. Is the first time unit after the feedback processing delay based on the time unit of, and when the length of the M time units is smaller than the feedback processing delay, the first time unit is the M time units. Last time unit.

  If the length of the M time units is greater than or equal to the feedback processing delay, as shown in FIG. 6, M and N are both 5, and the first time unit is the fourth of the M time units. The time unit, where the fourth time unit in the M time units is the first time unit after the feedback processing delay, based on the last time unit in the N time units. The terminal may transmit feedback information corresponding to downlink data in all (5) time units for downlink transmission in the first time unit.

  If the length of the M time units is smaller than the feedback processing delay, as shown in FIG. 5, N is 7, M is 3, and the first time unit is the last of the M time units. It is a unit of time. Since the specific processing is similar to the processing method of the previous embodiment, the description is omitted here.

  It should be understood that, in the above two embodiments, the feedback processing delay is both described as an example of four time unit lengths. In the prior art, the feedback processing delay is typically 4 ms. If the time unit is a subframe, the feedback processing delay corresponds to four time units. Of course, if the feedback processing delay is not an integer multiple of the length of the time unit, the difference in the number of time units between the first time unit for feedback and the last time unit fed back is the feedback processing delay, Rounded up by the unit length.

In the embodiment of the present invention, the terminal transmits the feedback information corresponding to the first K time unit downlink data in the N time units to the base station in the first time unit in the M time units. The thing is
The terminal generates C × K-bit information cascaded according to the time unit order as feedback information, where C is the maximum number of codewords supported by downlink transmission of the system;
The method may include the terminal transmitting feedback information to the base station in the first time unit.

  Specifically, the terminal receives downlink data within N time units for downlink transmission and transmits Cx to the base station in the first time unit of M time units for uplink transmission. Transmit K-bit information ACK and / or NACK feedback information. In the current LTE system, C is equal to 1 or 2 and is shown in FIG. 7 (C equals 1 and K equals 6) and FIG. 8 (C equals 2 and K equals 6), respectively. Here, one time unit for downlink transmission corresponds to C-bit feedback information, and C × K-bit information is cascaded in time unit order.

  If the terminal does not receive downlink data in a certain time unit for downlink transmission, the corresponding time unit feedback information is set to NACK. When C = 2, the terminal receives only one codeword in a certain time unit for downlink transmission, and the ACK / NACK information corresponding to the time unit for downlink transmission is set in the following two types. There is a method.

  Method 1: Feedback information of a scheduled codeword is set to ACK or NACK according to the decoding result, and feedback information of an unscheduled codeword is set to NACK.

  Method 2: The feedback information of the scheduled codeword is set to ACK or NACK according to the decoding result, and the feedback information of the unscheduled codeword is set in the same manner as the feedback information of the scheduled codeword.

  In an embodiment of the present invention, a base station can set a guard period (GP) for uplink transmission and downlink transmission. The length of the GP is Tms, and transmitting the downlink data to the terminal by the base station in N time units may include:

  In scheme 1, the base station transmits the downlink data to the terminal in N time units, where the last Tms of the last time unit in the N time units is used for transmitting the downlink data. I can't.

  Specifically, the base station controls itself, that is, the base station does not transmit downlink data in the last Tms of the last time unit in N time units for downlink transmission. The terminal does not need to know the length of the GP, receives downlink data in a manner in which there is no GP, or uses an enhanced physical downlink control channel (EPDCCH), a physical downlink shared channel (EPDCCH), or a physical downlink shared channel (EPDCCH). Blind detection is performed on PDSCH (Physical Downlink Shared Channel).

  In scheme 2, the base station transmits downlink data to the terminal in N time units, and the last L symbols of the last time unit in the N time units are not used for transmission of downlink data. , L symbols are greater than or equal to Tms, and the length of the L symbols is greater than Tms, times other than the last Tms in the L symbols are used to transmit placeholders.

  Specifically, the base station determines that the last L symbols in the last time unit of the N downlink time units for downlink transmission are not used for transmission of downlink data, , Including the transmission of PDSCH and EPDCCH, and the time length of L symbols is equal to or longer than Tms. The base station notifies the terminal of the value of L. If the time length of the L symbols is greater than Tms, the base station sends a placeholder for the first segment in the L symbols to avoid occupying the channel.

  It should be understood that a specific process in which the terminal performs uplink data transmission in M time units in the embodiment of the present invention is not described. The uplink transmission process is similar to the conventional unlicensed carrier uplink transmission process. The uplink data may include uplink service data, uplink control signaling, a detection signal, a synchronization preamble (Preamble) sequence, and the like, and a description thereof will be omitted herein.

  In a data transmission method according to an embodiment of the present invention, a feasible method of transmitting data in a scene where an unlicensed carrier operates independently is provided, thereby expanding the application range of the unlicensed carrier and improving uplink transmission. In this case, feedback information corresponding to a plurality of time units for downlink transmission within one time unit may be transmitted, thereby improving the efficiency of feedback.

  The complete process of the embodiment of the present invention has been described above. Hereinafter, a method for transmitting data from the terminal and the base station in the embodiment of the present invention will be described.

FIG. 9 shows a data transmission method 100 according to one embodiment of the present invention. Method 100 is performed by a terminal,
The terminal determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer and N Is a positive integer,
S120, in which the terminal receives downlink data transmitted from the base station in the N time units,
The terminal transmits feedback information corresponding to the first K time units of downlink data in the N time units to the base station in a first time unit in the M time units, wherein: K is a positive integer less than or equal to N, the first time unit is located after the first K time units, and the start time of the first time unit and the last time in the first K time units S130 in which the difference from the start time in the time unit is equal to or longer than the delay of the feedback processing of the system.

  In a data transmission method according to an embodiment of the present invention, a feasible method of transmitting feedback information in a scene where an unlicensed carrier operates independently is provided, and a downlink is transmitted within one time unit for uplink transmission. Feedback information corresponding to a plurality of time units for transmission may be transmitted, thereby improving feedback efficiency.

Also, as an example, prior to S110, the method 100 may include:
The terminal receives indication information at the start of the N time units, and the indication information indicates the N time units for downlink transmission and the M time units for uplink transmission. Can be further included.

Also, as one embodiment, the terminal sends feedback corresponding to the first K time units of the N time units to the base station in the first time unit of the M time units. S130 for transmitting information is
The terminal generates C × K-bit information cascaded according to the time unit order as the feedback information, wherein C is the maximum number of codewords supported by downlink transmission of the system;
A terminal may include transmitting the feedback information to the base station in the first time unit.

FIG. 10 shows a data transmission method 200 according to another embodiment of the present invention. Method 200 is performed by a base station,
A base station determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer; S210 where N is a positive integer;
S220 in which the base station transmits downlink data to the terminal in the N time units;
The base station receives feedback information corresponding to the first K time unit downlink data in the N time units transmitted from the terminal in the first time unit in the M time units, Where K is a positive integer equal to or less than N, the first time unit is located after the first K time units, and the start time of the first time unit and the first K time units S230 in which the difference from the start time of the last time unit in the unit is equal to or longer than the feedback processing delay of the system.

  In a data transmission method according to an embodiment of the present invention, a feasible method of transmitting feedback information in a scene where an unlicensed carrier operates independently is provided, and a downlink is transmitted within one time unit for uplink transmission. Feedback information corresponding to a plurality of time units for transmission may be transmitted, thereby improving feedback efficiency.

Also, in one embodiment, after S210, the method 200 includes:
A base station transmits indication information to a terminal at the start of the N time units, where the indication information is the N time units for downlink transmission and the M time units for uplink transmission. May be further included.

  In one embodiment, the feedback information is C × K-bit information cascaded according to a time unit order, where C is the maximum number of codewords supported by the downlink transmission of the system.

Also, in one embodiment, the method 200 includes:
The method may further include a base station setting a guard period for the uplink transmission and the downlink transmission.

Also, the length of the guard period is Tms, and the base station transmits downlink data to the terminal in the N time units in S220,
The base station transmits the downlink data to the terminal in the N time units, wherein a last Tms of a last time unit in the N time units is used for transmitting the downlink data. Not be able to
Or, the base station transmits the downlink data to the terminal in the N time units, and the last L symbols of the last time unit in the N time units correspond to the transmission of the downlink data. And the length of the L symbols is greater than or equal to Tms, and the length of the L symbols is greater than Tms, a time other than the last Tms in the L symbols transmits a placeholder. Used by the base station to notify the terminal of the value of L.

  It should be understood that in various embodiments of the present invention, the size of each process does not imply an order of execution, and the order of execution of each process should be determined by its function and internal logic. However, it does not constitute any limitation on the implementation process of the embodiments of the present invention.

  The data transmission method according to the embodiment of the present invention has been described above in detail. Hereinafter, a terminal device and a base station that transmit data according to the embodiment of the present invention will be described.

FIG. 11 shows a terminal 300 according to one embodiment of the present invention. The terminal 300
Configured to determine M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer; , N is a positive integer;
A receiving module 320 configured to receive downlink data transmitted from the base station in the N time units determined by the determining module 310;
In the first time unit of the M time units determined by the determination module 310, feedback information corresponding to the first K time unit downlink data of the N time units is transmitted to the base station. Configured to transmit, where K is a positive integer less than or equal to N, wherein the first time unit is located after the first K time units, and a start time of the first time unit; And a transmission module 330 in which a difference between the start time of the last time unit and the start time of the last K time units is equal to or longer than a feedback processing delay of the system.

In one embodiment, the receiving module 320 further includes:
The N time units may be configured to receive indication information at the start of the N time units, wherein the indication information is the N time units for downlink transmission and the M time units for uplink transmission. Used to indicate time units.

Further, as one embodiment, the transmission module 330 is specifically,
Generate C × K-bit information cascaded according to the time unit order as the feedback information, where C is the maximum number of codewords supported by the downlink transmission of the system,
It may be configured to transmit the feedback information to the base station in the first time unit.

  It should be noted that, in embodiments of the present invention, the receiving module 320 may be implemented by a receiver, the transmitting module 330 may be implemented by a transmitter, and the determining module 310 may be implemented by a processor. As shown in FIG. 12, the terminal 400 may include a processor 410, a receiver 420, a transmitter 430, and a memory 440. Here, the memory 440 may be used to store codes executed by the processor 410 and the like.

  The components of the terminal 400 are connected via a bus system 450. The bus system 450 includes a power bus, a control bus, and a status signal bus in addition to the data bus.

  Since the terminal 300 shown in FIG. 11 or the terminal 400 shown in FIG. 12 can realize each process realized in the embodiments of FIGS. 1 to 10, in order to avoid repetition, the description will Omitted.

  It should be noted that the above method embodiments of the present invention may be applied to or implemented by a processor. The processor may be an integrated circuit chip and has a signal processing function. In the implementation process, each step in the embodiment of the above method may be completed by a hardware integrated logic circuit or a command in a software form in a processor. The above-mentioned processor is a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA: Field Programmable Gate device) or other programmable logic. It may be a discrete gate or transistor logic device, a discrete hardware member. Each method, step, and logic block diagram disclosed in the embodiments of the present invention can be realized or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the disclosed method in combination with the embodiments of the present invention may be implemented and completed by a hardware decoding processor, or may be directly embodied to be performed and completed by a combination of hardware and software modules in a decoding processor. May be done. The software modules may be located on mature storage media in the art, such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines it with the hardware to complete the steps of the method.

It is understood that the memory in embodiments of the present invention may be a volatile storage device or a non-volatile storage device, or may include both a volatile storage device and a non-volatile storage device.
Here, the nonvolatile storage device is a read-only memory (ROM: Read-Only Memory), a programmable read-only memory (PROM: Programmable ROM), and an erasable programmable read-only memory (EPROM: Erasable).
(PROM), electrically erasable programmable read only memory (EEPROM) or flash memory. The volatile storage device may be a random access memory (RAM: Random Access Memory) functioning as an external cache memory. By way of example and not limitation, many forms of RAM are available, eg, static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access. Memory (SDRAM: Synchronous DRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM: Double Data Rate SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM: Enhanced SDRAM), Synchronous Link Dynamic Random Access Memory (SLDRAM) : Synclink DRAM) and a direct RAM bus random access memory (DR RAM: Direct Rambus RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memory.

FIG. 13 shows a base station 500 according to one embodiment of the present invention. The base station 500
Configured to determine M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer; , N is a positive integer;
A transmission module 520 configured to transmit downlink data to the terminal in the N time units determined by the determination module 510;
Feedback corresponding to the first K time unit downlink data of the N time units transmitted from the terminal in the first time unit of the M time units determined by the determination module 510 Receiving the information, wherein K is a positive integer less than or equal to N, wherein the first time unit is located after the first K time units, and a start of the first time unit is provided. A receiving module 530 having a difference between the time point and the start time point of the last time unit in the first K time units that is equal to or greater than a feedback processing delay of the system.

In one embodiment, the transmission module 520 further includes:
The N time units may be configured to transmit indication information to a terminal at the start of the N time units, where the indication information includes the N time units for downlink transmission and the M time units for uplink transmission. Used to indicate time units.

  Also, in one embodiment, the feedback information may be C × K bit information cascaded in time unit order, where C is the maximum number of codewords supported by the system downlink transmission. is there.

Further, as one embodiment, the base station 500 includes:
The apparatus may further include a configuration module configured to configure a guard period for the uplink transmission and the downlink transmission.

  Note that, in embodiments of the present invention, the receiving module 530 may be implemented by a receiver, the transmitting module 520 may be implemented by a transmitter, and the determining module 510 may be implemented by a processor. As shown in FIG. 14, the base station 600 can include a processor 610, a receiver 620, a transmitter 630, and a memory 640. Here, the memory 640 may be used to store codes executed by the processor 610 and the like.

  The components of the base station 600 are connected via a bus system 650. The bus system 650 includes a power bus, a control bus, and a status signal bus in addition to the data bus.

  The base station 500 shown in FIG. 13 or the base station 600 shown in FIG. 14 can realize each process realized in the embodiments of FIGS. 1 to 10 described above. Description is omitted.

  In each method, terminal, and base station according to the embodiment of the present invention, as one embodiment, the first time unit is the last time unit in the M time units.

Further, in each method, terminal and base station in the embodiment of the present invention, as another embodiment, when the length of the M time units is equal to or longer than the feedback processing delay, the first time unit is The first time unit after the feedback processing delay based on the last time unit of the N time units, and if the length of the M time units is smaller than the feedback processing delay, Is the last time unit in the M time units. In each method, terminal and base station according to the embodiment of the present invention, the downlink data is broadcast information, a synchronization signal, a reference signal, and a downlink signal. It includes at least one of control signaling and downlink service data.

  Also, in each method, terminal and base station in an embodiment of the present invention, the downlink control signaling includes scheduling information, and the scheduling information is used for scheduling the M time-based uplink transmissions.

  Also, in each method, terminal and base station in the embodiment of the present invention, the scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units is one of the M time units. Used for scheduling uplink transmission in units of time.

  Also, in each method, terminal and base station in the embodiment of the present invention, the scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units is a plurality of scheduling information in the M time units. Used for scheduling uplink transmission in units of time.

  In each method, terminal and base station according to the embodiment of the present invention, the time unit is a subframe or a time slot.

  Those skilled in the art will appreciate that the example units and algorithm steps described in combination with the embodiments disclosed herein may be implemented in electronic hardware or a combination of computer software and electronic hardware. I can understand. Whether these functions are implemented in hardware or software depends on the particular application of the technical solution and the design commitments. Although expert technicians may implement the described functionality using different methods for each particular application, such implementations should not be deemed to be beyond the scope of the present invention.

  For the purpose of convenience and concise description, those skilled in the art may refer to the corresponding processes in the above-described method embodiments for specific operation processes of the above-described systems, devices and units, and clearly omit the description herein. can do.

  It is to be understood that in some embodiments provided by the present application, the disclosed systems, devices, and methods may be implemented in other manners. The embodiments of the device described above are only exemplary, for example, the division of the units is only a logic functional division, and there may be other division schemes in actual implementation, for example, a plurality of units or members. May be combined or integrated into another system, or some features may be ignored or not performed. Also, the interconnections or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices or units, and may be electrical, mechanical or other forms. You may.

  The unit described as a separate member may or may not be physically separated, and the member indicated as a unit may be a physical unit or a physical unit. It may not be a strategic unit, that is, it may be located in one place or distributed over a plurality of network units. Here, depending on actual needs, some or all of the units can be selected to achieve the purpose of the solution of this embodiment.

  In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may physically exist alone, and two or more units may be one. It may be integrated into a unit.

When the functions are implemented in the form of a software functional unit and sold or used as an independent product, the functions may be stored in one computer-readable storage medium.
Based on such an understanding, the technical solution of the present invention may be realized essentially in the form of a software product, or a part contributing to the prior art or a part of the technical solution may be realized in the form of a software product. The computer software product may be implemented on a single computer device (which may be a personal computer, server, or network device, etc.) by performing all or some steps of the method according to each embodiment of the present invention. It is stored in a storage medium containing some commands to be executed. The storage medium includes various media capable of storing a program code, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

  The above are only the preferred embodiments of the present invention, and do not limit the present invention, and those skilled in the art may have various kinds of modifications and changes of the present invention. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (12)

A data transmission method,
The terminal determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer and N is Must be a positive integer
The terminal receives downlink data transmitted from the base station in the N time units;
The terminal transmits feedback information corresponding to downlink data of the first K time units in the N time units to the base station in a first time unit in the M time units, wherein: , K is a positive integer equal to or less than N, and the first time unit is located after the first K time units, and at the start time of the first time unit and the first K time units. The difference from the start of the last time unit is greater than or equal to the system feedback processing delay,
The terminal receives another signaling transmitted from the base station, and the another signaling includes feedback information corresponding to downlink data in a time unit after a Kth time unit in the N time units. Indicating the transmission method,
The terminal transmits feedback information corresponding to downlink data in a time unit after a K-th time unit in the N time units to the base station based on a transmission scheme indicated by the another signaling. The data transmission method, comprising: The method of claim 1, wherein the first time unit is the last time unit of the M time units. The method comprises:
The terminal receives indication information at the start of the N time units, and the indication information indicates the N time units for downlink transmission and the M time units for uplink transmission. The method according to any of the preceding claims, further comprising: The method according to any one of claims 1 to 3, wherein the downlink data includes at least one of broadcast information, a synchronization signal, a reference signal, downlink control signaling, and downlink service data. . The method of claim 4, wherein the downlink control signaling includes scheduling information, wherein the scheduling information is used to schedule the M time-based uplink transmissions. The scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units is used for scheduling uplink transmission in one time unit in the M time units. The method according to claim 5. The scheduling information transmitted in each time unit for uplink transmission scheduling in the N time units is used for scheduling uplink transmission in a plurality of time units in the M time units. The method according to claim 5. The terminal transmits feedback information corresponding to the first K time units of downlink data in the N time units to the base station in the first time unit in the M time units,
The terminal generates cascaded C × K bit information according to the time unit order and uses the information as feedback information, where C is the maximum number of codewords supported by downlink transmission of the system;
The method according to any one of claims 1 to 7, comprising: the terminal transmitting the feedback information to the base station in the first time unit. The method according to claim 1, wherein the time unit is a subframe or a time slot. A data transmission method,
A base station determines M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer; N is a positive integer;
The base station transmits downlink data to the terminal in the N time units;
The base station receives feedback information corresponding to the first K time units of downlink data in the N time units transmitted from the terminal in a first time unit of the M time units. Where K is a positive integer equal to or less than N, the first time unit is located after the first K time units, and the start time of the first time unit and the first K time units are The difference of the time unit from the start time of the last time unit is not less than the feedback processing delay of the system, and
The base station transmits another signaling to the terminal, wherein the another signaling is a feedback information transmission scheme corresponding to downlink data in time units after the Kth time unit in the N time units. To instruct,
The base station receiving feedback information corresponding to downlink data in a time unit after a K-th time unit in the N time units transmitted from the terminal. A terminal,
Is configured to determine M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer. , N is a positive integer;
A receiving module configured to receive downlink data transmitted from a base station in the N time units determined by the determining module;
Sending feedback information corresponding to the first K time unit downlink data in the N time units to the base station in the first time unit in the M time units determined by the determination module. Wherein K is a positive integer less than or equal to N, the first time unit is located after the first K time units, and a start time of the first time unit and A transmission module wherein a difference between the start time of the last time unit and the start time of the last K time units is equal to or more than a feedback processing delay of the system;
The receiving module is further configured to receive another signaling transmitted from the base station, wherein the another signaling is downlink data in a time unit after a Kth time unit in the N time units. Indicate the feedback information transmission method corresponding to
The transmitting module further transmits feedback information corresponding to downlink data in a time unit after a K-th time unit in the N time units to the base station based on a transmission scheme indicated by the another signaling. The terminal, wherein the terminal is configured to: A base station,
Is configured to determine M time units for uplink transmission on the unlicensed carrier and N time units for downlink transmission on the unlicensed carrier, where M is a positive integer. , N is a positive integer;
A transmission module configured to transmit downlink data to a terminal in the N time units determined by the determination module;
Feedback information corresponding to the first K time unit downlink data of the N time units transmitted from the terminal in the first time unit of the M time units determined by the determination module. Where K is a positive integer less than or equal to N, wherein the first time unit is located after the first K time units, and a start time of the first time unit And a receiving module in which a difference between the start time of the last time unit in the first K time units and the start time of the last time unit is equal to or greater than a feedback processing delay of the system.
The transmitting module is further configured to transmit another signaling to the terminal, wherein the another signaling is a feedback corresponding to downlink data in time units after a Kth time unit in the N time units. Indicate the information transmission method,
The base station, wherein the receiving module further receives feedback information corresponding to downlink data in a time unit after a K-th time unit in the N time units transmitted from the terminal.

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