WO2018028057A1

WO2018028057A1 - Data transmission method and communication apparatus

Info

Publication number: WO2018028057A1
Application number: PCT/CN2016/104365
Authority: WO
Inventors: 彭金磷; 王龙保; 胡远洲; 董朋朋; 王宗杰; 张鹏
Original assignee: 华为技术有限公司
Priority date: 2016-08-09
Filing date: 2016-11-02
Publication date: 2018-02-15

Abstract

The present invention relates to the technical field of wireless communications, and specifically discloses a data transmission method and a communication apparatus. The data transmission method provided by embodiments of the present invention comprises: a sending device sends initial transmission data of first data on m minimum scheduling time units by means of a first process, m being a positive integer greater than 1; a receiving device receives the first data on the m minimum scheduling time units and performs decoding; the receiving device feeds back acknowledge information of the first data to the sending device according to the decoding result; the sending device determines, according to the received acknowledge information of the first data, whether to retransmit the first data, and if yes, retransmits the first data on n minimum scheduling time units, n being a positive integer, and n being less than m. Such a HARQ retransmission mechanism, in which a retransmission resource is smaller than an initial transmission resource and repeated retransmission attempts are made until a receiving device performs accurate decoding, can achieve matching between the retransmission resource and a wireless channel, and thus avoid wasting the retransmission resource.

Description

Data transmission method and communication device

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and a communication device.

Background technique

The uplink data and the downlink data in the long term evolution (LTE) system are respectively carried by a physical uplink shared channel (PUSCH) and a physical downlink shared channel (PDSCH). In order to ensure the reliability and transmission efficiency of data transmission, the LTE system adopts two key technologies: adaptive modulation and coding (AMC) and hybrid automatic repeat request (HARQ).

The AMC is a process of determining a modulation and coding scheme (MCS) of data transmission according to channel state information (CSI), wherein the CSI is estimated based on reference signals (RS) measurements. For uplink communication, the base station first estimates the uplink CSI according to the RS measurement sent by the user equipment (UE), then determines the MCS of the uplink data communication according to the CSI, and finally notifies the UE by using the downlink control channel; and for the downlink communication, the base station first sends the uplink communication. The RS is used by the UE to estimate the downlink CSI and report the downlink CSI to the base station. Finally, the base station determines the MCS of the downlink data communication according to the obtained CSI. The PUSCH and PDSCH of the current LTE system generally affect the selection of the MCS by controlling the initial block error rate (IBLER) target value (for example, 10%).

For reliable transmission of data, the LTE system introduces HARQ technology based on AMC. HARQ is a technology that combines forward error correction (FEC) and automatic repeat request (ARQ). The receiving device can correct part of the error data through FEC technology. For the error data that cannot be corrected. Receiving device sends The device requests to retransmit the data of the original transport block (TB). In order to enable continuous data transmission between the transmitting device and the receiving device using the HARQ technology, a multi-HARQ process mechanism may be introduced. When the data of one HARQ process is waiting for feedback from the receiving end, data transmission may be continued through other HARQ processes. .

In an actual LTE system, accurate CSI cannot be obtained due to non-ideal measurement estimation algorithm, and the channel selected based on the MCS and data transmission selected based on the CSI is not caused by the delay from measuring CSI to data transmission. match. The above problem is particularly severe in scenarios where the channel is highly degraded in high-speed mobile channels or in scenarios where dynamic interference such as time division duplex (TDD) changes rapidly. Therefore, there is still a large room for spectrum efficiency improvement in HARQ in current LTE systems.

Summary of the invention

Embodiments of the present invention provide a data transmission method and a communication device to improve spectral efficiency of data transmission.

The embodiment of the present invention can be specifically implemented by the following technical solutions:

In a first aspect, an embodiment of the present invention provides a data transmission method, including: transmitting, by using a first process, initial data of a first data, where m is a positive integer greater than one, on m minimum scheduling time units. Receiving confirmation information of the first data, the confirmation information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received, and sent by the first process on the n minimum scheduling time units The retransmission data of the first data, where n is a positive integer and n is less than m.

The embodiment of the present invention achieves matching between the retransmission resource and the wireless channel by using a HARQ retransmission mechanism in which the retransmission resource is smaller than the initial transmission resource and attempts to be correctly decoded by the receiving device by multiple retransmission attempts, thereby avoiding retransmission of resources. Waste, improving spectrum efficiency.

In a possible design, the interval between two adjacent minimum scheduling time units in the m minimum scheduling time units is greater than or equal to a loopback delay of a data transmission (Round Trip Time, RTT). The RTT of the data transmission is a loopback delay for transmitting data from the transmitting device to the acknowledgment information for receiving the data. With this HARQ timing mechanism, synchronous HARQ can be implemented, which can effectively reduce the control information overhead of HARQ.

In a possible design, when n is greater than 1, the time interval of two adjacent minimum scheduling time units in the above n minimum scheduling time units is greater than or equal to the RTT of one data transmission.

In a possible design, the method further includes: the minimum scheduling time unit for transmitting the initial data or the retransmitted data of the first data by using the first process is further used to send the second data by using the second process. By performing space division multiplexing on the first data and the second data, the spectral efficiency of the digital transmission can be further improved.

In a possible design, the difference between the process number of the second process and the process ID of the first process is fixed. When the difference between the process ID of the second process and the process ID of the first process is fixed, the corresponding control information only needs to carry the process ID of one process, and the receiving device can derive another according to the process number of the process. The process number of the process, which saves the overhead of control information.

In one possible design, the above m minimum scheduling time units are consecutive in the time domain. With this HARQ timing, since the minimum scheduling time unit of one data transmission is continuous in time, the time of data transmission can be effectively reduced.

In a possible design, the difference between the process number of the second process and the process ID of the first process is not fixed. For scenes in which m minimum scheduling time units are consecutive in the time domain, two processes that may cause space division multiplexing are caused by two processes in which space division multiplexing may occur, one for initial transmission and the other for space division multiplexing. The number of minimum scheduling time units used is different. By making the difference between the process numbers of the second process and the first process unfixed, the resources of the space division can be fully utilized to improve the spectrum efficiency.

In a possible design, the method further includes: transmitting control information, the control information including information for determining a process number of the first process and a process number of the second process. The difference between the process IDs of the first process and the second process is not fixed, and is carried in the control information. The information of the process number of the first process and the second process facilitates the receiving device to correctly receive the data.

In a possible design, the method further includes: transmitting control information, the control information controlling the initial transmission of the first data, or controlling the retransmission of the first data, or simultaneously controlling the initial transmission and the weight of the first data. Transmitting, or controlling, data transmission of one of the above m or one of the n minimum scheduling time units.

In one possible design, the above control information includes at least one of the value information of m and the value information of n.

In a possible design, the method further includes: determining a redundancy version RV, the RV is used to control initial transmission of the first data, or to control retransmission of the first data, or to control the m or the above n Data transmission of a minimum scheduling time unit in the minimum scheduling time unit.

In a second aspect, the embodiment of the present invention provides another method for data transmission, which is a method performed by a receiving device corresponding to the method of the first aspect, and thus can also implement the data transmission method of the first aspect. The benefits. The method includes: receiving, by the first process, initial transmission data of the first data on the m minimum scheduling time units, where m is a positive integer greater than 1; sending the confirmation information of the first data, the confirmation information is used for confirming Whether the first data transmitted on the m minimum scheduling time units is correctly received; receiving retransmission data of the first data on n minimum scheduling time units, where n is a positive integer and n is less than m.

In a possible design, the time interval of two adjacent minimum scheduling time units in the m minimum scheduling time units is greater than or equal to the RTT of one data transmission. The RTT of the data transmission is a loopback delay from the sending of the data to the sending device to the receipt of the acknowledgment information.

In one possible design, the method further comprises: receiving, by the second process, the second data on a minimum scheduling time unit that receives the first data.

In a possible design, the process number of the second process described above and the process of the first process described above The difference between the numbers is fixed.

In one possible design, the above m minimum scheduling time units are consecutive in the time domain.

In a possible design, the difference between the process number of the second process and the process ID of the first process is not fixed.

In a possible design, the method further comprises: receiving control information, the control information comprising information for determining a process number of the first process and a process number of the second process.

In a possible design, the method further includes: receiving control information, controlling the initial transmission of the first data, or controlling retransmission of the first data, or simultaneously controlling initial transmission and weight of the first data. Transmitting, or controlling, data transmission of one of the above m or one of the n minimum scheduling time units.

In one possible design, determining the redundancy version RV as described above includes: determining the RV in a predefined manner; or determining the RV by receiving control information including information for determining the RV.

In a third aspect, the embodiment of the present invention further provides a communication device, which implements the function of the transmitting device in the data transmission method of the first aspect, and thus can also realize the beneficial effects of the data transmission method of the first aspect. The function of the communication device may be implemented by hardware, or may be implemented by hardware corresponding software. The hardware or software includes at least one module corresponding to the functions described above.

In one possible design, the communication device includes a processor and a transceiver. a processor, configured to determine a value of m, m is a positive integer greater than 1, and a transceiver configured to send initial data of the first data through the first process on the m minimum scheduling time units; the transceiver further uses Receiving the Confirmation information of the first data, the confirmation information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received; the processor is further configured to determine a value of n, n is a positive integer, and n is less than m; the transceiver is further configured to send retransmission data of the first data through the first process on the n minimum scheduling time units.

In a possible design, the time interval of two adjacent minimum scheduling time units in the m minimum scheduling time units is greater than or equal to the RTT of one data transmission.

In a possible design, the transceiver is further configured to send the second data by using the second process on the minimum scheduling time unit that sends the first data.

In a possible design, the difference between the process number of the second process and the process ID of the first process is fixed.

In a possible design, the transceiver is further configured to: send control information, where the control information includes information for determining a process ID of the first process and a process ID of the second process.

In a possible design, the transceiver is further configured to: send control information, where the control information controls initial transmission of the first data, or controls retransmission of the first data, or simultaneously controls initial transmission of the first data. And retransmitting, or controlling data transmission of one of the above m or one of the n minimum scheduling time units.

In a possible design, the processor is further configured to: determine a redundancy version RV, the RV is used to control initial transmission of the first data, or control retransmission of the first data, or control the m or the foregoing Data of one of the n minimum scheduling time units transmission.

In a fourth aspect, the embodiment of the present invention further provides a communication device, which implements the function of the receiving device in the data transmission method of the second aspect, and thus can also achieve the beneficial effects of the data transmission method of the second aspect. The function of the communication device may be implemented by hardware, or may be implemented by hardware corresponding software. The hardware or software includes at least one module corresponding to the functions described above.

In one possible design, the communication device includes a processor and a transceiver. a processor, configured to determine a value of m, m is a positive integer greater than 1; a transceiver, configured to receive initial data of the first data through the first process on the m minimum scheduling time units; the transceiver further uses And acknowledgment information for transmitting the first data, the acknowledgment information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received; the processor is further configured to determine a value of n, where n is A positive integer, and n is less than m; the transceiver is further configured to receive retransmission data of the first data on the n minimum scheduling time units.

In a possible design, the transceiver is further configured to: receive, by the second process, the second data on a minimum scheduling time unit that receives the first data.

In a possible design, the above transceiver is further configured to: receive control information, the control signal The information includes information for determining the process number of the first process and the process number of the second process.

In a possible design, the transceiver is further configured to: receive control information, where the control information controls initial transmission of the first data, or controls retransmission of the first data, or simultaneously controls initial transmission of the first data. And retransmitting, or controlling data transmission of one of the above m or one of the n minimum scheduling time units.

In a possible design, the processor is further configured to: determine a redundancy version RV, the RV is used to control initial transmission of the first data, or control retransmission of the first data, or control the m or the foregoing Data transmission of one of the n minimum scheduling time units.

In a fifth aspect, an embodiment of the present invention provides a communication system, where the system includes the communication device of the third aspect and the communication device of the fourth aspect.

In a sixth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the communication device of the third aspect, which includes a program designed to perform the above aspects.

In a seventh aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the communication device of the fourth aspect, which includes a program designed to perform the above aspects.

Embodiments of the present invention achieve rematch between retransmission resources and radio channels by adopting a HARQ retransmission mechanism in which retransmission resources are smaller than the initial transmission resources and through multiple retransmission attempts until the receiving device correctly decodes, thereby avoiding retransmission. The waste of resources increases the efficiency of the spectrum.

DRAWINGS

1 is a schematic flowchart of data transmission by using a HARQ transmission mechanism according to an embodiment of the present invention;

2 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a timing of a HARQ process according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another HARQ process sequence according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of RV control data transmission according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of timing of a HARQ process in a space division multiplexing scenario according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of timing of a HARQ process in another space division multiplexing scenario according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of still another HARQ process sequence according to an embodiment of the present invention;

FIG. 8a is a schematic diagram of still another HARQ process sequence according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic timing diagram of a HARQ process of a TDD system according to an embodiment of the present invention;

10 is a timing diagram of a HARQ process of another TDD system according to an embodiment of the present invention;

FIG. 11 is a timing diagram of another HARQ process of a TDD system according to an embodiment of the present invention;

11a is a timing diagram of another HARQ process of a TDD system according to an embodiment of the present invention;

FIG. 12 is a timing diagram of another HARQ process of a TDD system according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a communication apparatus according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of another communication apparatus according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present invention; FIG.

FIG. 16 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope shall fall within the scope of the present invention.

The flow of data transmission using the HARQ transmission mechanism is as shown in FIG. 1. The information bit sequence is subjected to channel coding to generate a coded bit sequence, and the coded bit sequence is stored in the HARQ buffer; according to the redundancy version (redundancy version, initial transmission or retransmission) RV) extracting the coded bit sequence line rate matching from the HARQ buffer to obtain a physical channel bit sequence; modulating the physical channel bit sequence to generate a physical channel symbol sequence; and mapping the physical channel symbol sequence to a corresponding time frequency Transfer on the resource.

In order to solve the problems in the existing AMC and HARQ technologies and improve the spectrum efficiency of data transmission, embodiments of the present invention provide a data transmission method as shown in FIG. 2, which includes: transmitting devices at m minimum Sending, by the first process, the initial data of the first data, where m is a positive integer greater than 1; the receiving device receives the initial data of the first data and performs decoding on the m minimum scheduling time units; Receiving, by the receiving device, the acknowledgement information of the first data to the sending device according to the decoding result; the sending device determines, according to the received confirmation information of the first data, whether to retransmit the first data, and if retransmission is to be performed, n The first data is retransmitted on the minimum scheduling time unit, where n is a positive integer and n is less than m. The minimum scheduling time unit may be understood as a minimum unit that implements scheduling in the time domain, and may be, for example, a 1 ms transmission time interval (TTI), a subframe (Subframe), or a symbol level short TTI or a high frequency in an LTE system. The short TTIs and the sub-frames of the large sub-carriers in the system may also be the slots and the mini-slots in the 5G system, but the embodiment of the present invention does not limit this.

According to the HARQ retransmission mechanism of the embodiment of the present invention, the retransmission resource is smaller than the initial transmission resource. The source passes multiple retransmission attempts until the receiving device correctly decodes, thereby achieving matching between the retransmission resource and the wireless channel, avoiding waste of retransmission resources, and improving spectrum efficiency.

The transmitting device and the receiving device in the embodiments of the present invention may be any one of the transmitting end device and the receiving end device that performs data transmission in a wireless manner. The transmitting device and the receiving device may be any device with wireless transceiver function, including but not limited to: a base station NodeB, an evolved base station eNodeB, a base station in a fifth generation (5th) communication system, and a WiFi system. Access node, wireless relay node, wireless backhaul node, and user equipment (UE). The UE may also be referred to as a terminal terminal, a mobile station (MS), a mobile terminal (MT), etc., and the UE may be connected to one or more cores via a radio access network (RAN). The network communicates, and the UE can also directly communicate wirelessly with other UEs.

The data transmission method provided by the embodiment of the present invention can be applied to downlink data transmission, and can also be applied to uplink data transmission, and can also be applied to device to device (D2D) data transmission. For downlink data transmission, the transmitting device is a base station, and the corresponding receiving device is a UE. For uplink data transmission, the transmitting device is a UE, and the corresponding receiving device is a base station. For data transmission of D2D, the transmitting device is a UE, and the corresponding receiving device is also a UE. The embodiment of the present invention does not limit the application scenario.

The data transmission method provided by the embodiment of the present invention can be applied to any communication system adopting HARQ technology, and can be applied to a frequency division duplex (FDD) system or a TDD system; and can be applied to an LTE system. It can also be applied to future 5G communication systems. This embodiment of the present invention does not limit this.

The data transmission method in Fig. 2 will be described in detail below.

201. The sending device sends the initial data of the first data by using the first process on the m minimum scheduling time units.

For uplink or downlink data transmission of the LTE system, the scheduler may be more in the cell according to the CSI information, the service type, the buffer size in the data queue, and the priority of the user to which the UE belongs. The UEs perform scheduling to determine the MCS of the scheduled UE, the allocated resources, and the HARQ process used. It can be understood that the scheduler can also determine a transport block size (TBS) according to the code modulation mode, the number of allocated resource blocks (RBs), and the size of m. In the LTE system, the scheduler is a logical function module inside the base station. For downlink data transmission, the scheduler and the sending device belong to the same physical device. For uplink data transmission and D2D data transmission, the scheduler and the sending device belong to different physical entities. device.

The sending device acquires data from the queue buffer according to the determined TBS, adds a MAC header and a Cyclic Redundancy Check (CRC), determines whether to segment according to the data size, and adds a CRC in each data segment. Each data segment is further input into a channel coding module as shown in FIG. 1 for encoding. Common coding methods for encoding data channels include turbo coding, convolutional coding, low-density parity-check (LDPC) coding, and polar code.

The sending device allocates m initial scheduling time units according to the scheduling result, and sends initial data of the first data on the first process, where the value of m can be associated with a specific scenario. The value of m can be determined in a predefined manner, for example, the value of m or the value of m is specified in the standard protocol. The value of m can also be dynamically determined by the scheduler. For example, the scheduler can dynamically determine the value of m according to the current available resource situation and the service characteristics of the data. When the scheduler and the sending device belong to different physical devices, for example, the uplink data transmission, the value of the dynamically determined m of the scheduler may be notified to the sending device by using a message, where the message may be a Radio Resource Control (RRC) message. Any one of a Media Access Control Control Element (MAC CE) and physical layer control signaling.

FIG. 3 and FIG. 4 are schematic diagrams showing the timing of a HARQ process of a data transmission method according to an embodiment of the present invention, where m is equal to 4 and the process ID of the first process is 0.

As shown in FIG. 3, each minimum scheduling time unit corresponds to a unique process number, the process number of the 0th minimum scheduling time unit is 0, and the process number of the first minimum scheduling time unit is 1, the second minimum. The process number of the scheduling time unit is 2, and the process number of the third minimum scheduling time unit 3, the process number of the 4th minimum scheduling time unit is 0, the process number of the 5th minimum scheduling time unit is 1, and so on. Assuming that the Round Trip Time (RTT) of the acknowledgment information sent from the transmitting device to the acknowledgment information received is less than or equal to the length of time that the four minimum scheduling time units have elapsed, the transmitting device transmits data through the process 0 for the next time. The acknowledgment information of the data sent by process 0 this time can be received before, so that the continuous transmission of data on the process can be ensured.

Optionally, as shown in FIG. 3, the time interval of two adjacent minimum scheduling time units in the m minimum scheduling time units for the initial transmission of the first data is greater than or equal to the RTT of one data transmission. With this HARQ process timing, a fixed timing relationship between different processes can be maintained, so that the overhead of control information for data transmission can be reduced.

Optionally, as shown in FIG. 4, the m minimum scheduling time units for the initial transmission of the first data are consecutive in the time domain. With this HARQ process timing, the digital transmission delay can be effectively reduced.

The initial transmission of the first data may be controlled by an RV, such as RV0 in FIG. 3 and FIG. 4, according to RV0, data is obtained from the HARQ buffer of the first process for rate matching, and a physical channel bit sequence is obtained, and then the physical channel is obtained. The bit sequence is modulated into a sequence of physical channel symbols, and finally mapped to corresponding time-frequency resources in the m minimum scheduling time units.

The initial transmission of the first data can also be controlled by a plurality of RVs, each of which controls the data transmission of a minimum scheduling time unit. As shown in Figure 5, RV0 is used to control the data transmission of the 0th minimum scheduling time unit; RV1 is used to control the data transmission of the 1st minimum scheduling time unit; RV2 is used to control the data transmission of the 2nd minimum scheduling time unit. ; RV3 is used to control the data transmission of the third minimum scheduling time unit.

In order to enable the receiving device to demodulate and decode the received initial data of the first data, the sending device may send the control information to the receiving device, where the control information may include the value information of the m for determining the value of the m. The value information of the m may be a specific value of m, an index value of the value of m, or other forms of information for determining the value of m. The control information may further include RV information, and the receiving end determines the value of the RV and further determines the RV according to the RV. The value of the first data determines the location of the first data of the first data in the HARQ buffer, so as to send the received data to the decoder for decoding. The control information may further include HARQ process number information, such as the asynchronous HARQ shown in FIG. 4, and the HARQ process number is carried by the control information, which can bring greater scheduling flexibility to the scheduler; but for the synchronization shown in FIG. HARQ, because there is a fixed timing relationship between different processes, the control information may not carry the process number, thereby effectively reducing the overhead of the control information.

The foregoing control information may be sent only once in the initial transmission of the first data, for controlling initial transmission of the first data; the control information may also be sent in each minimum scheduling time unit for controlling each minimum scheduling time. Unit data transfer. When the control information is sent in each of the minimum scheduling time units, the control information may further include information indicating that the current minimum scheduling time unit is the first minimum scheduling time unit of the m minimum scheduling time units. The control information may not include the value information of m, and instead includes a decoding indication information, which is used to indicate whether the receiving device needs to decode after receiving the data in the minimum scheduling time unit, and indirectly indicates The value of m. For example, 1 bit indicates whether decoding is to be performed, 1 indicates that decoding is required, 0 indicates that decoding is not required, or 0 indicates that decoding is required, and 1 indicates that decoding is not required.

Optionally, the minimum scheduling time unit for transmitting the initial data of the first data by using the first process may further be used to send the second data by using the second process, where the first data and the second data use the same time-frequency resource. The space division multiplexing is performed, where the second data may be the initial data of the second data or the retransmission data of the second data. It can be understood that the m minimum scheduling time units that transmit the initial data of the first data may have a part of the minimum scheduling time unit for the transmission of the second data, and a part of the minimum scheduling time unit is used for the transmission of the third data, and even A part of the minimum scheduling time unit is used for the transmission of the fourth data, which is not limited by the embodiment of the present invention.

When the time interval between two adjacent minimum scheduling time units in the m minimum scheduling time units is greater than or equal to the RTT of one data transmission, the difference between the process number of the first process and the process number of the second process is fixed. As a predefined constant, as shown in FIG. 6, the constant is 4, the corresponding process number of the first process is 0, and the process number of the second process is 4. When the above m minimum adjustments When the time unit is continuous in the time domain, the difference between the process number of the first process and the process number of the second process is not fixed, so that the process numbers of the two processes of the space division multiplexing can be freely numbered. To achieve effective reuse of resources, as shown in Figure 7, process 0 can be spatially multiplexed with process 4, or can be spatially multiplexed with process 7. When the difference between the process ID of the first process and the process ID of the second process is not fixed, in order for the receiving device to accurately know the process number of the two processes of the space division multiplexing, it may be sent to the receiving device. The control information includes the process ID of the first process and the process ID of the second process, and is used to determine the process ID of the first process and the process ID of the second process.

202. The receiving device receives the initial data of the first data and performs decoding on the m minimum scheduling time units by using the first process.

Specifically, after receiving the initial data of the first data on the m minimum scheduling time units, the receiving device performs decoding, and if the decoding succeeds, generates a positive acknowledgment information ACK, and if the decoding fails, generates a negative acknowledgment information. NACK.

The data transmission method of the embodiment of the present invention can greatly reduce the decoding overhead and the feedback signaling overhead of the receiving device, compared to the decoding of the data on each of the minimum scheduling time units. In addition, since the joint channel estimation can be performed by multiple minimum scheduling time units, the density of the reference signal can be reduced, thereby reducing the control channel overhead and improving the spectrum efficiency, while achieving the same channel estimation accuracy.

The manner in which the receiving device determines the value of m may be one or a combination of the following manners: a predefined manner; a semi-static determination by a message; and a dynamic determination by a message. The predefined manner here may be to specify the value of m or the value of m in the standard protocol, and the value of m may be associated with a specific scenario. The message in the message semi-statically determined or dynamically determined by the message may be one or more of the following message types: RRC message, MAC CE, and physical layer control signaling. The receiving device may determine the value of m in a predefined manner, may also be semi-statically determined by receiving the RRC message, or may be dynamically determined by receiving the MAC CE or the physical control signaling, or may determine an initial value by using a predetermined manner. Then semi-static or dynamic by receiving messages Modify the value of m. The RRC message, the MAC CE, and the physical layer control signaling may be sent by the sending device to the receiving device, or may be sent by the scheduler to the receiving device. The scheduler is usually a logical function entity in the base station, but the embodiment of the present invention does not limit this.

203. The receiving device feeds back, to the sending device, the confirmation information of the first data.

The receiving device feeds back the acknowledgement information of the first data to the transmitting device according to the decoding result in 202, and the acknowledgement information may be a positive acknowledgement message ACK or a negative acknowledgement message NACK.

The receiving device may feed back the confirmation information at the kth minimum scheduling time unit after receiving the data of the last minimum scheduling time unit in the current data transmission. Here, the data transmission can be either initial transmission or retransmission. For the initial transmission, the last minimum scheduling time unit is the mth minimum scheduling time unit of the current transmission; for the retransmission, the last minimum scheduling time unit. This is the nth minimum scheduling time unit of this transmission. Taking k equal to 4 as an example, if the data of the last minimum scheduling time unit in the current data transmission is received in the 12th minimum scheduling time unit, the receiving end feeds back the confirmation information in the 16th minimum scheduling time unit.

For the scenario of space division multiplexing as shown in FIG. 6 or FIG. 7, the receiving device may also feed back the confirmation information of the second data to the transmitting device while feeding back the confirmation information of the first data to the transmitting device. The confirmation information of the first data is fed back by the first process, and the confirmation information of the second data is fed back by the second process. It can be understood that, since the last minimum scheduling time unit of one transmission of the first data and the last minimum scheduling time unit of one transmission of the second data may not be aligned in time, the receiving device may separately feed back to the sending device. The confirmation information of the second data is not fed back the confirmation information of the first data; or the receiving device separately feeds back the confirmation information of the first data to the transmitting device without feeding back the confirmation information of the second data.

204. The sending device sends retransmission data of the first data by using the first process on the n minimum scheduling time units, where n is a positive integer, and n is less than m.

Specifically, the sending device determines, according to the received confirmation information of the first data, whether to retransmit the first data. When the acknowledgement information is ACK, it indicates that the first data has been correctly received by the receiving device, and the first data does not need to be retransmitted, and the corresponding first process is HARQ. The cache will be released and the first process can be used to transfer new data. When the acknowledgement information is NACK, indicating that the first data has not been correctly received by the receiving device, the sending device sends the retransmitted data of the first data by using the first process on the n minimum scheduling time units. The retransmission data of the first data may be obtained in the HARQ cache of the first process according to the retransmitted RV. For the specific processing, refer to the related description in FIG. 1 . Each retransmission of the first data can be controlled by a different RV or by the same RV. The number n of minimum scheduling time units used for each retransmission of the first data may be the same or different, for example, the number n of the minimum scheduling time units used for the first retransmission and the second retransmission may be Different embodiments of the present invention do not limit this.

In FIGS. 3 and 4, n is equal to 1, but n is not limited to 1. When n is greater than 1, similar to the m minimum scheduling time units in the initial transmission, the two adjacent minimum scheduling time units in the n minimum scheduling time units for retransmitting the first data may be consecutive in the time domain. It may also be that the interval between two adjacent minimum scheduling time units is greater than or equal to the RTT of one data transmission.

Optionally, in order to enable the receiving device to demodulate and decode the retransmitted data of the received first data, the sending device may send the control information to the receiving device, where the control information may include the value information of n, and may also include The RV information may also include HARQ process number information. For a detailed description of the control information, reference may be made to the previous description of the control information of the initial transmission of the first data.

Optionally, for the synchronous HARQ shown in FIG. 3, the current process number may be directly determined according to the current time, because the HARQ timing is fixed, and the coded modulation mode of the fixed retransmission and the RB are consistent with the initial transmission, if receiving The device determines the value of n in a predefined manner or semi-statically through the RRC message. The transmission of the first data may be sent by the sending device to the receiving device once at the time of initial transmission, and may not be transmitted when the first data is retransmitted. Then send control information.

Optionally, the minimum scheduling time unit for transmitting the retransmission data of the first data by using the first process may further be used to send the second data by using the second process, where the first data and the second data use the same time-frequency resource. Performing space division multiplexing, where the second data may be the first pass of the second data The data may also be retransmitted data of the second data. For the timing relationship of the first process and the second process and related control methods, reference may be made to the related description in 201.

The timing relationship between the HARQ processes shown in FIG. 4 is sequential incrementing and cyclic data transmission, regardless of whether new or retransmission is used. Figure 8 provides a schematic diagram of a different HARQ timing than that shown in Figure 4, in which the retransmission has a higher priority than the initial transmission. As shown in FIG. 8, since the retransmission data has a higher priority than the initial transmission data, the retransmission data of the process 0 on the seventh minimum scheduling time unit will be a new transmission of the four consecutive minimum scheduling time units of the process 1. The data is separated, and it can also be understood that the data on the partial minimum scheduling time unit of process 1 is delayed.

In addition to the delayed transmission of the above-mentioned new data due to the priority of the retransmission being higher than the initial transmission, the arrival of some urgent or high priority data in the system may also result in delayed transmission of the above new data. The ultra-reliable and low-latency communications (URLLC) service requires very high reliability and very short delays. Usually, the reliability requirement is 99.999% and the delay requirement is within 1 ms. If the new data currently being transmitted is an enhanced mobile broadband (eMBB) service, the data transmission requirement of the URLLC service is suddenly received, since the current resources have been allocated and used to transmit the eMBB service data, in order to satisfy the URLLC service. For the data delay requirement, the network side can transmit the data of the URLLC service by means of the URLLC service preempting the transmission resource of the eMBB service. There are four specific preemption methods:

(1) Delay the transmission of the transmitted eMBB data. As shown in FIG. 8a, the 21st minimum scheduling time unit is to transmit the URLLC service data, and the original transmission data of the process 0 is delayed to be transmitted to the 22nd minimum scheduling time unit. For another example, the data of the process 1 (new transmission or retransmission) of the eMBB service needs to be transmitted on the four minimum scheduling time units numbered 1, 2, 3, and 4, and suddenly the URLLC service data needs to be numbered as The minimum scheduling time unit of 2 is transmitted. For this reason, the eMMB data originally scheduled to be transmitted on the minimum scheduling time units numbered 2, 3, and 4 is sequentially postponed to the minimum scheduling time units numbered 3, 4, and 5. transmission.

(2) Delay transmission of eMBB data on the affected minimum scheduling time unit. For example, The data of the process 1 (new transmission or retransmission) of the eMBB service needs to be transmitted on the four minimum scheduling time units numbered 1, 2, 3 and 4, and suddenly the URLLC service data needs to be at the minimum number 2 The scheduling time unit is transmitted. For this reason, the eMMB data originally scheduled to be transmitted on the minimum scheduling time unit numbered 3 and 4 continues to be transmitted on the minimum scheduling time unit numbered 3 and 4, and the original plan is numbered 2 The data transmitted on the minimum scheduling time unit is delayed to the minimum scheduled time unit numbered 5 for transmission.

(3) Delay transmission of the affected eMBB data. The URLLC service data may only need a part of resources on a minimum scheduling time unit. For example, only a few resource blocks (RBs) are needed, and even only a few resource elements (RE elements) are needed. The eMBB service data to be transmitted on the resource is delayed in transmission, and other data on the resource that is not preempted by the URLLC service data continues to be transmitted using the original resource.

(4) The affected eMBB data is no longer transmitted, and this part of the eMBB data is directly destroyed.

Optionally, for the manner that the three possible URLLCs of the foregoing (1) to (3) preempt the eMBB resources, the network side may send the control information to the terminal to indicate the specific resource location used by the delayed transmission data, and/ Or which part of the data is specifically transmitted, and/or the transport format used, wherein the transport format may include at least one of an encoding mode, a modulation mode, a code rate, and a redundancy version number.

The foregoing URLLC service data preempts the transmission resource of the eMBB service data, which is only an example, and is used to indicate that the high-priority service preempts the resources of the low-priority service. The embodiment of the present invention does not limit which service is a high priority service, and which service is a low priority service.

The above embodiments can be applied to an FDD system as well as to a TDD system.

For the particularity of the TDD system, based on the design idea of the present invention, there may be the following embodiments: FIG. 9 is a schematic diagram of HARQ timing of downlink data transmission in which one data transmission is mapped to multiple discrete minimum scheduling time units, and FIG. 10 is once. A HARQ timing diagram of uplink data transmission in which data transmission is mapped to a plurality of discrete minimum scheduling time units, and FIG. 11 is a HARQ timing diagram of downlink data transmission in which one data transmission is mapped to a plurality of consecutive minimum scheduling time units, 12 is a HARQ timing diagram of uplink data transmission in which one data transmission is mapped to a plurality of consecutive minimum scheduling time units. For the scenario in which data transmission is performed on one consecutive data transmission time unit in FIG. 11 and FIG. 12, the scheduling algorithm can be used to control the minimum number of scheduling time units available for newly transmitting or retransmitting data, thereby avoiding one time. Multiple consecutive minimum scheduling time units in a new or retransmission are transmitted across the gap.

FIG. 11a is a schematic diagram of HARQ timing of downlink data transmission in which one data transmission is mapped to a plurality of consecutive minimum scheduling time units, wherein the last minimum scheduling time unit of process 0 of the eMBB service is preempted by the URLLC service data, thereby causing the process of the eMBB service. The data of the last minimum scheduling time unit of 0 is delayed until the next minimum scheduling time unit is transmitted. As mentioned above, there are four ways for the URLLC service to seize the resources of the eMBB service, which is not described here.

Each p1 minimum scheduling time unit performs an uplink and downlink handover, and the uplink and downlink handovers are separated by an interval Gap, and the uplink and downlink are stopped during the Gap. The p1 minimum scheduling time units can all be used for downlink data transmission, as shown in FIG. 9 and FIG. 11, and can also be used for uplink data transmission. As shown in FIG. 10 and FIG. 12, p1 is equal to 4. The p1 minimum scheduling time unit may also be partially used for uplink data transmission, and partially for downlink data transmission. For example, two minimum scheduling units are used for uplink data transmission, and two minimum scheduling units are used for downlink data transmission. By performing only one uplink and downlink handover through such multiple minimum scheduling time units, the overhead of Gap can be effectively saved. P2 is the delay required by the receiving device to receive data, decode and feed back the decoded result. The value of p2 depends on the processing capability of the hardware. Here, p2 is assumed to be equal to 1. The corresponding process number p can be equal to p1+p2, as shown in FIG. 9 to FIG. 12, p=5, that is, continuous transmission of data is realized by 5 processes.

As shown in FIG. 9 and FIG. 11, for downlink communication, four minimum scheduling time units for downlink transmission are separated from the uplink control channel by one Gap, and acknowledgement information of downlink data transmission is aggregated and transmitted on the uplink control channel. As shown in FIG. 10 and FIG. 12, for uplink communication, 4 Gaps are allocated between the minimum scheduling time unit for uplink transmission and the downlink control channel, and the acknowledgement information of the uplink data transmission and the scheduling information are aggregated and transmitted on the downlink control channel. .

The above mainly focuses on the interaction between the network elements themselves and from the interaction between the network elements. The method of data transmission provided by the example is introduced. It can be understood that each network element, such as a transmitting device, a receiving device, etc., in order to implement the above functions, includes hardware structures and/or software modules corresponding to the respective functions. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of computer software or hardware or a combination of hardware and computer software, in conjunction with the elements and methods of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware, computer software or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

FIG. 13 is a schematic structural diagram of a possible communication apparatus according to an embodiment of the present invention. The communication device realizes the function of the transmitting device in the embodiment of the data transmission method described above, and thus can also realize the beneficial effects of the above data transmission method. In the embodiment of the present invention, the communication device may be a UE, a base station, or another transmitting device that uses data communication of the HARQ technology. The communication device includes a processor 1301 and a transceiver 1302.

The processor 1301 is configured to determine a value of m, where m is a positive integer greater than 1.

The transceiver 1302 is configured to send, by using the first process, initial data of the first data on the m minimum scheduling time units.

The transceiver 1302 is further configured to receive the acknowledgement information of the first data, where the acknowledgement information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received.

The processor 1301 is further configured to determine a value of n, n is a positive integer, and n is less than m.

The transceiver 1302 is further configured to send retransmission data of the first data by using the first process on the n minimum scheduling time units.

Specifically, how the processor 1301 determines the values of m and n can refer to the related description in the foregoing method embodiments.

The transceiver 1302 is further configured to send second data by using a second process on a minimum scheduling time unit that sends the first data, where the second data is spatially multiplexed with the first data.

The transceiver 1302 can also be configured to send control information, which can include determining The process ID of the first process and the process ID of the second process. The foregoing control information may be used to control initial transmission of the first data, or control retransmission of the first data, or simultaneously control initial transmission and retransmission of the first data, or control data transmission of a minimum scheduling time unit. The above control information may further include at least one of the value information of m and the value information of n.

The processor 1301 can also be configured to determine a redundancy version RV for controlling initial transmission of the first data, or controlling retransmission of the first data, or controlling data transmission of a minimum scheduling time unit.

It will be understood that Figure 13 only shows one design of the communication device. In practical applications, the communication device can include any number of processors and transceivers, and all communication devices that can implement embodiments of the present invention are within the scope of the present invention.

FIG. 14 is a schematic structural diagram of another possible communication apparatus according to an embodiment of the present invention. The communication device realizes the functions of the communication device in the above embodiment of the data transmission method, and thus can also realize the advantageous effects of the above data transmission method. In the embodiment of the present invention, the communication device may be a UE, a base station, or another transmitting device that uses data communication of the HARQ technology. The communication device includes a processing unit 1401 and a transceiver unit 1402. The processing unit 1401 implements related functions in the processor 1301, and the transceiver unit 1402 implements related functions in the transceiver 1302.

FIG. 15 is a schematic structural diagram of still another possible communication apparatus according to an embodiment of the present invention. The communication device realizes the function of the receiving device in the embodiment of the data transmission method described above, and thus can also achieve the beneficial effects of the above data transmission method. In the embodiment of the present invention, the communication device may be a UE, a base station, or another receiving device that uses data communication of the HARQ technology. The communication device includes a processor 1501 and a transceiver 1502.

The processor 1501 is configured to determine a value of m, where m is a positive integer greater than 1.

The transceiver 1502 is configured to receive initial data of the first data by using the first process on the m minimum scheduling time units.

The transceiver 1502 is further configured to send the acknowledgement information of the first data, where the acknowledgement information is used for confirming Whether the first data transmitted on the m minimum scheduling time units is correctly received.

The processor 1501 is further configured to determine a value of n, n is a positive integer, and n is less than m.

The transceiver 1502 is further configured to receive retransmission data of the first data on the n minimum scheduling time units.

Specifically, how the processor 1501 determines the values of m and n can refer to the related description in the foregoing method embodiments.

The transceiver 1502 is further configured to receive second data by using a second process on a minimum scheduling time unit that receives the first data, the second data being spatially multiplexed with the first data.

The transceiver 1502 is further configured to receive control information, where the control information may include information for determining a process number of the first process and a process number of the second process. The foregoing control information may be used to control initial transmission of the first data, or control retransmission of the first data, or simultaneously control initial transmission and retransmission of the first data, or control data transmission of a minimum scheduling time unit. The above control information may further include at least one of the value information of m and the value information of n.

The processor 1501 can also be configured to determine a redundancy version RV for controlling initial transmission of the first data, or controlling retransmission of the first data, or controlling data transmission of a minimum scheduling time unit. The processor 1501 may determine the RV in a predefined manner, or determine the RV by receiving control information including information for determining the RV.

It will be understood that Figure 15 only shows one design of the communication device. In practical applications, the communication device can include any number of processors and transceivers, and all communication devices that can implement embodiments of the present invention are within the scope of the present invention.

FIG. 16 is a schematic structural diagram of another possible communication apparatus according to an embodiment of the present invention. The communication device realizes the function of the receiving device in the embodiment of the data transmission method described above, and thus can also achieve the beneficial effects of the above data transmission method. In the embodiment of the present invention, the communication device may be a UE, a base station, or another receiving device that uses data communication of the HARQ technology. The communication device includes a processing unit 1601 and a transceiver unit 1602. The processing unit 1601 implements the related functions in the processor 1501, and the transceiver unit 1602 implements the transceiver 1502. Related functions in .

The processor for executing the above communication device of the embodiment of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array (FPGA). Or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or perform various exemplary logical functions and modules described in connection with the present disclosure.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions. The software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art. In the medium. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a user equipment, base station, or MCE. Of course, the processor and the storage medium may also reside as discrete components in the user equipment.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program or related information from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the protection, any modifications, equivalent substitutions, improvements, etc., which are made on the basis of the technical solutions of the present invention, are included in the scope of the present invention.

Claims

A data transmission method, comprising:

Transmitting initial data of the first data by the first process on the m minimum scheduling time units, where m is a positive integer greater than one;

Receiving confirmation information of the first data, the confirmation information being used to confirm whether the first data sent on the m minimum scheduling time units is correctly received;

Transmitting data of the first data by the first process on the n minimum scheduling time units, where n is a positive integer and n is less than m.
The method according to claim 1, wherein a time interval of two adjacent minimum scheduling time units of the m minimum scheduling time units is greater than or equal to a loopback delay RTT of a data transmission.
The method of claim 2, further comprising:

The minimum scheduling time unit for transmitting the initial data or the retransmission data of the first data by using the first process is further used to send the second data by using the second process.
The method according to claim 3, wherein the difference between the process number of the second process and the process number of the first process is fixed.
The method of claim 1 wherein said m minimum scheduling time units are contiguous in the time domain.
The method of claim 5, further comprising:

The minimum scheduling time unit for transmitting the initial data or the retransmission data of the first data by using the first process is further used to send the second data by using the second process.
The method according to claim 6, wherein the difference between the process number of the second process and the process number of the first process is not fixed.
The method of claim 7 further comprising:

Transmitting control information, the control information including a process number for determining the first process and Information about the process number of the second process.
The method of any of claims 1-8, further comprising:

Transmitting control information, the control information controlling initial transmission of the first data, or controlling retransmission of the first data, or simultaneously controlling initial transmission and retransmission of the first data, or controlling the m Or data transmission of one of the n minimum scheduling time units.
The method according to claim 9, wherein the control information comprises at least one of value information of m and value information of n.
The method according to any one of claims 1 to 10, further comprising:

Determining a redundancy version RV for controlling initial transmission of the first data, or controlling retransmission of the first data, or controlling one of the m or the n minimum scheduling time units Data transmission of the minimum scheduling time unit.
A data transmission method, comprising:

Receiving, by the first process, initial transmission data of the first data on the m minimum scheduling time units, where m is a positive integer greater than 1;

Sending confirmation information of the first data, the confirmation information being used to confirm whether the first data sent on the m minimum scheduling time units is correctly received;

Retransmitting data of the first data is received on n minimum scheduling time units, where n is a positive integer and n is less than m.
The method according to claim 12, wherein a time interval of two adjacent minimum scheduling time units of the m minimum scheduling time units is greater than or equal to a loopback delay RTT of a data transmission.
The method of claim 13 further comprising:

The second data is received by the second process on a minimum scheduling time unit that receives the first data.
The method of claim 14, wherein the process of the second process The difference between the number and the process number of the first process is fixed.
The method of claim 12 wherein said m minimum scheduling time units are contiguous in the time domain.
The method of claim 16 further comprising:

The second data is received by the second process on a minimum scheduling time unit that receives the first data.
The method according to claim 17, wherein the difference between the process number of the second process and the process number of the first process is not fixed.
The method of claim 18, further comprising:

Receiving control information, the control information including information for determining a process number of the first process and a process number of the second process.
The method of any of claims 12-19, further comprising:

Receiving control information, the control information controlling initial transmission of the first data, or controlling retransmission of the first data, or simultaneously controlling initial transmission and retransmission of the first data, or controlling the m Or data transmission of one of the n minimum scheduling time units.
The method according to claim 20, wherein the control information comprises at least one of value information of m and value information of n.
The method according to any one of claims 12 to 21, further comprising:

Determining a redundancy version RV for controlling initial transmission of the first data, or controlling retransmission of the first data, or controlling one of the m or the n minimum scheduling time units Data transmission of the minimum scheduling time unit.
A communication device, comprising:

a processor, configured to determine a value of m, where m is a positive integer greater than one;

a transceiver, configured to send, by using a first process, initial data of the first data on the m minimum scheduling time units;

The transceiver is further configured to receive acknowledgement information of the first data, where the acknowledgement information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received;

The processor is further configured to determine a value of n, n is a positive integer, and n is less than m;

The transceiver is further configured to send retransmission data of the first data by using the first process on the n minimum scheduling time units.
The communication device of claim 23, wherein the transceiver is further for performing the method of any of claims 2-10.
The communication device according to claim 23, wherein said processor is further for performing the method of claim 11.
A communication device, comprising:

a processor, configured to determine a value of m, where m is a positive integer greater than one;

a transceiver, configured to receive initial data of the first data by using the first process on the m minimum scheduling time units;

The transceiver is further configured to send acknowledgement information of the first data, where the acknowledgement information is used to confirm whether the first data sent on the m minimum scheduling time units is correctly received;

The processor is further configured to determine a value of n, n is a positive integer, and n is less than m;

The transceiver is further configured to receive retransmission data of the first data on n minimum scheduling time units.
The communication device of claim 26, wherein the transceiver is further for performing the method of any of claims 13-21.
The communication device of claim 26, wherein the processor is further for performing the method of claim 22.