WO2020015617A1

WO2020015617A1 - Communication method and device

Info

Publication number: WO2020015617A1
Application number: PCT/CN2019/096065
Authority: WO
Inventors: 徐修强; 王轶; 陈雁; 吕永霞
Original assignee: 华为技术有限公司
Priority date: 2018-07-16
Filing date: 2019-07-16
Publication date: 2020-01-23

Abstract

The present application discloses a communication method and device. In the method, a network device uses search space or a scrambling code of downlink control information (DCI) to indicate to a terminal device a scheme for sending an uplink data packet or receiving a downlink data packet. The method specifically comprises: a network device sending DCI; and on the basis of search space of the DCI or a scrambling code of the DCI, a terminal device determining a scheme for sending an uplink data packet or a scheme for receiving a downlink data packet, wherein the scheme for sending an uplink data packet can be a first scheme for sending an uplink data packet for multiple times or a second scheme for sending an uplink data packet only once, and the scheme for receiving a downlink data packet can be a first scheme for receiving a downlink data packet for multiple times or a second scheme for receiving a downlink data packet only once. In contrast to a scheme in which an additional indication domain is provided in DCI for indicating a scheme for sending an uplink data packet or receiving a downlink data packet, the present scheme can reduce DCI overhead.

Description

Communication method and device

This application claims priority from a patent application filed with the State Intellectual Property Office of China on July 16, 2018, with an application number of 201810779878.8, and a patent filed with the State Intellectual Property Office of China, with an application number of 201811142191.X, on September 28, 2018. The priority of the application, the entire contents of which are incorporated herein by reference, the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of communication technologies, and in particular, to a communication method and device.

Background technique

In the new radio access technology (New Radio Access Technology, New RAT, NR) of the fifth generation mobile communication system, the data packets of some services can be used to repeatedly send data packets, and the data packets of some services are not suitable for repeatedly sending data. In this scenario, the base station needs to notify the terminal device whether the currently transmitted data packet adopts the repeated transmission scheme, and there is currently no related solution on how the base station notifies the terminal device.

Summary of the invention

The present application provides a communication method and apparatus for notifying a terminal device of a scheme of sending an uplink data packet or a scheme of receiving a downlink data packet.

In a first aspect, the present application provides a communication method applied to a terminal device, specifically: the terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to send an uplink data packet; the The terminal device determines a scheme for sending the uplink data packet according to a search space or a scrambling code of the downlink control information, and the scheme for sending the uplink data packet is a first scheme for sending the uplink data packet multiple times or The second solution of sending the uplink data packet only once, the scrambling code is a codeword sequence that scrambles the downlink control information; a search space, also called (search space, SS), the search space It may be an SS in a physical downlink control channel (PDCCH) domain carrying downlink control information; the terminal device sends the uplink data packet to the network device according to the determined sending scheme.

It can be seen from the above that, in the embodiment of the present application, the number of times that a terminal device sends an uplink data packet can be determined according to the scrambling code and search space of the downlink control information. Compared to the manner of adding an additional indication field to the downlink control information, Reduce air interface resources and save downlink control resources.

In an example of the present application, if the search space is the first search space, it is determined that the scheme for sending the uplink data packet is the first scheme; or, if the search space is the second search space, it is determined to send the uplink data packet. The scheme of the uplink data packet is a second scheme, and the first search space is different from the second search space.

In another example of the present application, if the scrambling code is a first scrambling code, it is determined that a scheme for sending the uplink data packet is a first scheme; or, if the scrambling code is a second scrambling code To determine that the scheme for sending the uplink data packet is the second scheme, the first scrambling code is different from the second scrambling code, and the first scrambling code and the second scrambling code are of the same type or different types .

In the embodiment of the present application, the downlink control information may be specifically used to schedule the terminal device to retransmit the uplink data packet, and the method further includes: the terminal device according to the redundant version in the downlink control information The indication field determines the number of retransmission times of the uplink data packet.

It can be seen from the above that, in the embodiment of the present application, in addition to the first solution of instructing the terminal device to send uplink data packets multiple times, the terminal device can additionally instruct the number of times that the terminal device sends uplink data packets, which is flexible and simple to implement.

In a second aspect, a communication method applied to a network device includes: the network device generates downlink control information, and the downlink control information is used to schedule a terminal device to send an uplink data packet; the network device sends the The downlink control information; wherein a search space for sending the downlink control information or a scrambling code for the downlink control information is used to instruct the terminal device to send the uplink data packet, and the terminal device sends the uplink data packet The scheme of the uplink data packet is a first scheme of sending the uplink data packet multiple times or a second scheme of sending the uplink data packet only once, and the scrambling code is a codeword for scrambling the downlink control information. sequence.

In an example of the present application, a search space for sending the downlink control information is a first search space, and the first search space is used to indicate that a scheme in which the terminal device sends the uplink data packet is a first scheme . Alternatively, the search space used to send the downlink control information is a second search space, and the second search space is used to indicate that a scheme in which the terminal device sends the uplink data packet is a second scheme.

In an example of the present application, the scrambling code of the downlink control information is a first scrambling code, and the first scrambling code is used to indicate that a scheme in which the terminal device sends the uplink data packet is a first scheme. . Alternatively, the scrambling code of the downlink control information is a second scrambling code, and the second scrambling code is used to indicate that a scheme in which the terminal device sends the uplink data packet is a second scheme.

In the embodiment of the present application, the downlink control information may be specifically used to schedule the terminal device to retransmit the uplink data packet, wherein a redundant version indication field in the downlink control information is used to indicate the uplink Number of packet retransmissions.

According to a third aspect, a communication method is provided for a terminal device, including: the terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to receive a downlink data packet; The search space or scrambling code of the downlink control information determines a scheme for receiving the downlink data packet, and the scheme for receiving the downlink data packet is a first scheme for receiving the downlink data packet multiple times or only The second scheme of the downlink data packet once, the scrambling code is a codeword sequence for scrambling the downlink control information; and the terminal device receives the downlink data from the network device according to the determined receiving scheme. package.

In an example of the present application, if the search space is a first search space, it is determined that a scheme for receiving the downlink data packet is a first scheme; or, if the search space is a second search space, it is determined to receive the The scheme of the downlink data packet is a second scheme, and the first search space is different from the second search space.

In another example of the present application, if the scrambling code is a first scrambling code, it is determined that a scheme for receiving the downlink data packet is a first scheme; or, if the scrambling code is a second scrambling code Determining that a scheme for receiving the downlink data packet is a second scheme, and the first scrambling code is different from the second scrambling code.

In the embodiment of the present application, the downlink control information is specifically used to schedule the terminal device to receive the downlink data packet that is retransmitted, and the terminal device may further determine the downlink data packet according to the downlink control information. Number of retransmissions. As can be seen from the above, in the embodiment of the present application, the search space or scrambling code of the downlink control information can be used to instruct the terminal device to receive the downlink number of times of packets. Compared with the manner of adding an additional indication field to the downlink control information, It can reduce air interface overhead and save downlink control resources. At the same time, if the terminal device uses a search space or a scrambling code to determine that the terminal device receives the downlink data packet as the first solution, the terminal device may also use the redundant version indication field in the downlink control information to specifically indicate the terminal device. The number of times of receiving downlink data packets is flexible and easy to implement.

In a fourth aspect, the present application provides a communication method applied to a network device, including: the network device generates downlink control information, where the downlink control information is used to schedule a terminal device to receive a downlink data packet; the network device sends the terminal device to the terminal device Sending the downlink control information; wherein a search space for sending the downlink control information or a scrambling code for the downlink control information is used to indicate a scheme for the network device to send a downlink data packet, and the network device sends the The scheme of the downlink data packet is a first scheme of sending the downlink data packet multiple times or a second scheme of sending the downlink data packet only once, and the scrambling code is a code that scrambles the downlink control information. A word sequence; the network device sends the downlink data packet to the terminal device according to the indicated sending scheme.

In an example of the present application, a search space for sending the downlink control information is a first search space, and the first search space is used to indicate that a scheme for sending a downlink data packet is a first scheme. Alternatively, a search space for sending the downlink control information is a second search space, and the second search space is used to indicate that a scheme for sending the downlink data packet is a second scheme.

In another example of the present application, the scrambling code of the downlink control information is a first scrambling code, and the first scrambling code is used to indicate that a scheme for sending the downlink data packet is a first scheme. Alternatively, the scrambling code of the downlink control information is a second scrambling code, and the second scrambling code is used to indicate that a scheme for sending the downlink data packet is a second scheme.

In the embodiment of the present application, the downlink control information is specifically used to schedule the terminal device to receive the downlink data packet that is retransmitted, wherein the redundant version indication field in the downlink control information is used to indicate the downlink Number of packet retransmissions.

In a fifth aspect, the present application provides a communication method applied to a terminal device, including: the terminal device receiving downlink control information from a network device, where the downlink control information is used to schedule the terminal device to retransmit an uplink data packet; the The terminal device determines the number of times the terminal device retransmits the uplink data packet according to the redundant version indication field in the downlink control information; the terminal device retransmits the network device to the network device according to the determined number of retransmissions Upstream packets.

In an example of the present application, the determining, by the terminal device according to a redundant version indication field in the downlink control information, the number of times the terminal device retransmits the uplink data packet includes: The value indicated by the redundant version indication field determines the target retransmission times from a preset set of retransmission times, and the target retransmission times is the number of times that the terminal device retransmits the uplink data packet.

It can be seen from the above that, in the embodiment of the present application, the terminal device may use the redundant version indication field in the downlink control information to determine the number of times that the terminal device sends an uplink data packet. In contrast, the downlink control information additionally includes an indication field It can reduce air interface overhead and save downlink control resources.

According to a sixth aspect, the present application provides a communication method applied to a network device, including: the network device generates downlink control information; the network device sends the downlink control information to a terminal device, and the downlink control information is used to schedule the downlink control information; The terminal device retransmits the uplink data packet, and the redundant version indication field in the downlink control information is used to indicate the number of retransmissions of the uplink data packet.

In an example of the present application, a value indicated by the redundant version indication field indicates a sequence number of a target retransmission number in a preset retransmission number set, and the target retransmission number is a retransmission uplink of the terminal device. The number of packets.

In a seventh aspect, the present application provides a communication method applied to a network device, including: a terminal device receiving downlink control information from the network device, where the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet; Determining, by the terminal device, the number of times that the terminal device receives a retransmission of a downlink data packet according to the redundancy version indication field in the downlink control information; and according to the determined number of retransmissions, the terminal device receives from the network device Downstream packets.

In an example of the present application, the determining, by the terminal device according to a redundant version indication field in the downlink control information, the number of times the terminal device receives and retransmits the downlink data packet includes:

Determining, by the terminal device, a target retransmission number from a preset set of retransmission times according to a value indicated by the redundancy version indication field, and the target retransmission number is the terminal device receiving a retransmission downlink data packet Times.

It can be seen from the above that, in the embodiment of the present application, the network device may use the redundant version indication field existing in the downlink control information to determine the number of times the terminal device receives the retransmitted downlink data packet. Compared with the additional increase in the downlink control information, Indication field can reduce air interface overhead and save downlink control resources.

In an eighth aspect, the present application provides a communication method applied to a network device, including: the network device generates downlink control information; the network device sends the downlink control information to a terminal device, and the downlink control information is used to schedule the The terminal device receives the retransmitted downlink data packet, and the redundant version indication field in the downlink control information is used to indicate the number of times that the terminal device receives the retransmitted downlink data packet; the network device sends the The downlink data packet retransmitted by the terminal device.

In an example of the present application, a value indicated by the redundant version indication field indicates a sequence number of a target retransmission number in a preset retransmission number set, and the target retransmission number is a retransmission of the downlink data packet. Number of passes.

In a ninth aspect, the present application provides a communication device for a terminal device, including: a unit or a means for performing each step of the first aspect, the third aspect, the fifth aspect, or the seventh aspect.

According to a tenth aspect, the present application provides a communication apparatus for a network device, including: a unit or a means for performing each step of the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect.

In an eleventh aspect, the present application provides a communication device for a terminal device, including at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used for For implementing the methods provided in the first aspect, the third aspect, the fifth aspect, or the seventh aspect of the present application.

In a twelfth aspect, the present application provides a communication device for a network device, including at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used for For implementing the method provided by the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect of the present application.

In a thirteenth aspect, the present application provides a communication device for a terminal device including at least one processing element (or chip) for performing the above methods of the first aspect, the third aspect, the fifth aspect, or the seventh aspect.

In a fourteenth aspect, the present application provides a communication device for a network device, including at least one processing element (or chip) for performing the methods in the second, fourth, sixth, or eighth aspects above.

In a fifteenth aspect, the present application provides a program that, when executed by a processor, executes a method in any of the above aspects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application; FIG.

FIG. 2 is an example of data packet transmission provided by an embodiment of the present application; FIG.

FIG. 3 is another example of data packet transmission according to an embodiment of the present application; FIG.

FIG. 4 is a schematic structural diagram of a time slot according to an embodiment of the present application; FIG.

5 is a schematic flowchart of a communication method according to an embodiment of the present application;

6 is a schematic flowchart of a communication method according to an embodiment of the present application;

7a is a schematic flowchart of a communication method according to an embodiment of the present application;

7b is a schematic flowchart of a communication method according to an embodiment of the present application;

8a is a schematic flowchart of a communication method according to an embodiment of the present application;

8b is a schematic flowchart of a communication method according to an embodiment of the present application;

FIG. 9 is an example of a retransmission data packet provided by an embodiment of the present application; FIG.

10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 11 is another schematic structural diagram of a communication device according to an embodiment of the present application; FIG.

FIG. 12 is a schematic structural diagram of a base station according to an embodiment of the present application; FIG.

FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

FIG. 1 illustrates a communication system 100 according to an embodiment of the present application. The communication system 100 may include a network device 101 and a terminal device 102.

Among them, the network device 101 can provide wireless access-related services to the terminal device 102, and realize one or more of the following functions: wireless physical layer functions, resource scheduling and wireless resource management, and quality of service. Qos) management, wireless access control and mobility management functions.

At the same time, in the new radio access technology (New Radio Access Technology, New RAT, NR) of the fifth generation mobile communication system, in order to improve the reliability of data transmission and reduce the delay caused by transmission, the following solutions are proposed : Allow the sender to repeatedly send the same data packet on continuous or non-continuous time resources. The sender may be the network device 101 or the terminal device 102. For example, as shown in FIG. 2, the sending end may repeatedly send data packet 1 at time unit 1, time unit 2, time unit 3, and time unit 4. The maximum number of times a sender repeatedly sends a data packet is fixed. For example, if the resources configured for repetition are available, and the number of repetitions of a data packet that is pre-configured to be sent to the sender is k, then no matter what type of service the sender sends The packets are repeated k times.

Because in NR, there are high-latency required services and low-latency required services. Among them, for low-latency-requiring services, there is no problem in adopting the above solution. For services with high latency requirements, they can also be referred to as delay-sensitive services, such as extremely high-reliability and low-latency communication (URLLC) services. Using the above solution, there may be delays that cannot be met. Asked questions. For example, as shown in Figure 3, for the URLLC service, the delay from the arrival of the data packet to the first transmission does not exceed 1 time unit, which is set to time unit 0, data packet 1 arrives, and re-transmission of pre-configured data packets The number of times is 4 times, and the sending end can repeatedly send data packet 1 at time unit 1, time unit 2, time unit 3, and time unit 4. Set at time unit 3 and data packet 2 arrives, then the sender can only send data packet 2 repeatedly at time unit 5, time unit 6, time unit 7, and time unit 8. It can be obtained that, for data packet 1, from data packet The delay from the arrival of 1 (time unit 0) to the first transmission of data packet 1 (time unit 1) does not exceed 1 time unit, which meets the delay requirements. For data packet 2, the delay from the arrival of data packet 2 (time unit 3) to the first transmission of data packet 2 (time unit 5) is 2 time units, which is greater than 1 time unit and cannot meet the delay requirement.

It can be seen from the above that in the NR system, the data packets of some services can adopt the above-mentioned scheme of repeatedly sending data packets, and the data packets of some services are not suitable for adopting the scheme of repeatedly sending data packets. In this scenario, the base station needs to notify Terminal equipment, whether the currently transmitted data packet adopts the repeated transmission scheme.

Meanwhile, in the communication system shown in FIG. 1, the terminal device 102 sends uplink data or receives downlink data on the resources configured by the network device 101. In one example, the process for the terminal device 102 to send uplink data or receive downlink data may be specifically: first, the terminal device 102 receives downlink control information (down control information) (DCI) sent by the network device 101, and then sends the data according to the network device 101 The resources (or parameters) configured by the DCI to send uplink data or receive downlink data.

In one solution: an additional indication field is added to the DCI, and the indication field is used to indicate the number of repetitions of uplink data or downlink data currently scheduled by the network device 101. Because the physical downlink control channel (PDCCH) resources used to send DCI are scarce, using the above-mentioned method of adding an additional indicator field will bring additional DCI signaling overhead, making the physical downlink control channel resources It is more tense and affects the data scheduling of the network device 101.

Based on the foregoing, an embodiment of the present application provides a communication method that can indicate the number of data packet transmissions without additional DCI signaling overhead. The main principle is: through DCI-related parameters (such as DCI search Space or scrambling code, etc.) to determine the number of repeated transmissions of data scheduled by DCI.

To facilitate understanding, before introducing specific implementations, first introduce the relevant concepts of this application:

1) DCI, which can be specifically used to schedule the terminal device to transmit data packets for the first time and schedule the terminal equipment to retransmit data packets. For example, in an uplink scenario, the DCI can be specifically the DCI that schedules the terminal device to transmit for the first time or to transmit uplink data packets for the first time Or, to schedule the terminal device to retransmit the DCI of the uplink data packet. In a downlink scenario, the DCI may specifically be a DCI that schedules a terminal device to receive an initial transmission or a first transmission of a downlink data packet, or a DCI that schedules a terminal device to receive a retransmitted downlink data packet.

2) The redundant version indication field, also called (redundancy version, RV), is located in the DCI (a field in the DCI format), and may also be referred to as the DCI including the RV. In the prior art, the RV indication field of DCI is used to indicate the redundant version of the transmitted data packet. In the present invention, when the DCI is used to schedule a terminal device to transmit a data packet for the first time, the RV in the DCI is used to indicate a redundant version. When the DCI is used to schedule a terminal device to retransmit a data packet, the DCI is included in the DCI. RV is used to indicate the number of retransmissions of data packets, and the RV may specifically indicate the number of retransmissions of uplink data packets or the number of retransmissions of downlink data packets.

3) A search space, also known as (search space, SS). The search space may be an SS in the physical downlink control channel (PDCCH) domain of the DCI. In an example, as shown in FIG. 4, in the NR system, the network device and the terminal device can perform uplink and downlink data transmission in a slot unit. Each time slot may be composed of a control resource set (control resource set, CORESET) and a downlink data region. The CORESET may be composed of an SS, and the SS may be a common search space (common search space, CSS) or a UE-specific search space (UE-specific search space, UESS), the common search space and the UE-specific search space. Both can carry scheduling DCI. For the definition of the search space, please refer to the existing 3GPP standards, for example, 3GPP TS 38.213.

4) Scrambling code: A codeword sequence for scrambling DCI. For example, the scrambling code may be specifically used for scrambling cyclical redundancy check (CRC) bits of DCI, and the scrambling code may be a radio network temporary identity (RNTI) The RNTI may be specifically a cell-RNTI (cell-RNTI, C-RNTI), a configured scheduling RNTI (CS-RNTI), a Y-RNTI, a modulation and coding scheme RNTI (modulation and coding scheme, MCS-RNTI) Ultra-reliable and low-latency communication RNTI (URLLC-RNTI, U-RNTI) or other types of RNTI.

5) The first scheme for sending the uplink data packet multiple times: the terminal device sends multiple times for an uplink data packet on multiple continuous or non-continuously configured time resources. The first scheme of sending uplink data multiple times is also referred to as repetition (also referred to as repeated transmission) or aggregation (also referred to as aggregated transmission) of uplink data packets. The number of times the same uplink data packet is sent may be referred to as a repetition number or an aggregation factor, and the number of repetitions or an aggregation factor may be a network device through high-level signaling (for example, radio resource control (RRC) signaling), the redundant versions of the uplink data packets sent by the terminal device multiple times may be the same or different. The time-frequency resources used for repetition or aggregation can be configured by the network device. In an example of the present application, the network device may pre-configure the number of times K1 the terminal device sends an uplink data packet. If the terminal device determines that the current scheme of sending the uplink data packet is the first scheme of sending the uplink data packet multiple times, the The maximum number of times is determined by the number of repetitions or the aggregation factor configured by high-level signaling. In an example of the present application, if the terminal device determines that the current scheme for sending uplink data packets is the first scheme for sending uplink data packets multiple times, the maximum number of times to send uplink data packets may be determined by the redundancy version indication field in the DCI, For example, the redundancy version in DCI indicates that the terminal device sends K2 times the uplink data packet, and the terminal device can send the uplink data packet K3 times, and the K3 is less than or equal to K2.

6) The second scheme of sending the uplink data packet only once: The terminal device sends the uplink data packet only once on the configured time resource, and the second scheme of sending the uplink data packet only once can be referred to as not sending the uplink data packet once. The data packets are repeated, or the uplink data packets are not aggregated.

7) The third scheme for receiving downlink data packets multiple times: the terminal device receives multiple times for the following row data packets on multiple consecutive or non-continuously configured time resources. The third solution of receiving downlink data packets multiple times is also referred to as repeating or aggregating downlink data packets. The number of times that the same downlink data packet is received can be referred to as the number of repetitions or the aggregation factor. The number of repetitions or the aggregation factor can be configured by the network device through the upper layer. The redundant versions of the downlink data packets received by the terminal device multiple times may be the same or different .

8) The fourth scheme for receiving the downlink data packet only once: the terminal device receives the next time data packet only once on the configured time resource. The scheme of receiving the downlink data packet only once is also referred to as not repeating the downlink data packet, or not aggregation of the downlink data packet.

9) Network device: It can be a device that connects a terminal device to a wireless network in the network. The network device is a node in a radio access network, and may also be called a base station, and may also be called a radio access network (RAN) node (or device). At present, some examples of network equipment are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home NodeB, or home NodeB, HNB), baseband unit , BBU), or wireless fidelity (Wifi) access point (access point, AP), etc. In addition, in a network structure, the network device may include a centralized unit (CU) node and a distributed unit (DU) node. This structure separates the protocol layer of the eNB in a long term evolution (LTE) system. Some protocol layer functions are centrally controlled by the CU. The remaining part or all of the protocol layer functions are distributed in the DU. Centralized control of DU.

10) Terminal equipment: also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a way to provide voice and / or data connectivity to users Devices, such as handheld devices with wireless connectivity, in-vehicle devices, etc. At present, some examples of terminal devices are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality Augmented reality (AR) equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self-driving, wireless terminal equipment in remote surgery, and smart grid ( A wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, and the like.

11) Communication system: It can be various radio access technology (RAT) systems, such as, for example, code division multiple access (CDMA), time division multiple access (TDMA), frequency Frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (FDMA, SC-FDMA), and other systems. The term "system" is used interchangeably with "network." The CDMA system can implement wireless technologies such as universal wireless terrestrial access (UTRA) and CDMA2000. UTRA may include Wideband CDMA (WCDMA) technology and other CDMA modified technologies. CDMA2000 can cover the Interim Standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards. The TDMA system can implement wireless technologies such as the Global System for Mobile Communication (GSM). OFDMA system can implement such as evolved universal wireless land access (evolved UTRA, E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMA terminal equipment), IEEE 802.20, Wireless technologies such as Flash OFDMA. UTRA and E-UTRA are UMTS and UMTS evolved versions. 3GPP is a new version of UMTS using E-UTRA in long term evolution (LTE) and various versions based on LTE evolution. In addition, the communication system can also be applied to future-oriented communication technologies. The system architecture and service scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those of ordinary skill in the art may know that with the network The evolution of the architecture and the emergence of new business scenarios. The technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

In addition, it should be understood that in the description of this application, the words "first" and "second" are used only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating Or imply order.

In order to facilitate understanding, an introduction is made to an application scenario of the processes shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b provided in the embodiments of the present application, but this application scenario is not intended as an application to this application. The limit.

In order to ensure the reliability of data transmission, the data transmission can be divided into a data first transmission process and a data retransmission process, and the first data transmission can also be referred to as the first data transmission. During the first transmission of data, the sender may send one or more data packets. During the retransmission of data, the sender may send one or more data packets. The sender may be the network shown in Figure 1. Device 101 or terminal device 102. For example, as shown in FIG. 9, the transmission process of data packet 1 can be divided into the first transmission process of data packet 1 or the retransmission process of data packet 1, and during the first transmission process of data packet 1, the sending end can send one or more Data packet. During the retransmission of data packet 1, the sending end may send one or more data packets.

In the embodiment of the present application, the processes shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b can be specifically applied to the first transmission process of the data packet, and can also be specifically applied to the data packet. During retransmission. When the processes provided in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b are applied to the retransmission process of the data packet, if the sending end is a network device, the following implementation of this application The "network equipment sends downlink data packets" described in the example can be specifically referred to as network equipment retransmission downlink data packets, and accordingly, "terminal equipment receives downlink data packets" can be specifically referred to as terminal equipment receiving retransmitted downlink data packets . The “terminal device sends an uplink data packet” may be specifically referred to as a terminal device retransmitting an uplink data packet, and accordingly, the “network device receives a downlink data packet” may be referred to as a network device receiving a retransmitted uplink data packet. When the processes provided in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, and FIG. 8a to FIG. 8b of this application are applied to the initial transmission process of a data packet, if the sending end is a network device, "the network device sends a downlink data packet ", Which may specifically be the first or first time that a network device sends a downlink data packet. Correspondingly," the terminal device receives a downlink data packet ", specifically, the terminal device receives the first or first time transmitted downlink data packet. The "terminal device sends an uplink data packet" may specifically be the first or first time the terminal device sends an uplink data packet, and the "network device receives the uplink data packet" may specifically mean that the network device receives the first or first transmission of the uplink data packet. It should be noted that the above application scenario is only an example of the application scenario of this application, and is not intended to limit the application scenario of this application. The method provided in this embodiment of the application can also be applied to other application scenarios, for example, data is not distinguished In the application scenarios of initial transmission and retransmission.

As shown in FIG. 5, this application provides a communication method. The communication method is mainly applied to a scheme for instructing a terminal device to send an uplink data packet. The scheme for a terminal device to send an uplink data packet may be a first scheme for sending an uplink data packet multiple times. Or the second solution of sending the uplink data packet only once.

As shown in FIG. 5, the method may specifically be:

Step S501: The network device generates a DCI, where the DCI is used to schedule a terminal device to send an uplink data packet. In an example of the present application, in an uplink scenario, a network device may send a DCI to a terminal device. When the terminal device receives the DCI, it will send an uplink data packet according to the DCI scheduling.

In another example of the present application, the DCI may specifically be activation DCI, which is used to activate uplink data transmission of a terminal device. For example, in an uplink license-free scenario, a network device may pre-allocate resources used by a terminal device for sending data in an unauthorized manner. For convenience of description, the above-mentioned resources may be referred to as license-free transmission resources, and the license-free transmission resources may include transmission resources and transmission parameters. For example, in an example of the present application, the configuration parameters of the license-free transmission resource include at least one or more of the following:

Period (Periodicity, P), offset parameters of time domain resources (Offset), time domain resource allocation (Time domain resource allocation), frequency domain resource allocation (Frequency domain domain resource allocation), user specific demodulation reference signal configuration information (UE -Specific (DMRS configuration), modulation and coding strategy (An MCS value), number of repetitions K (Number of repetitions K), K> = 1, power control related parameters (parameters) and redundancy version (Redundancy Version) sequence.

Uplink authorization-free transmission is also called uplink transmission without dynamic scheduling, uplink transmission without dynamic grant, or configuration authorized transmission with uplink transmission. According to the different resource allocation methods, uplink license-free transmission can be divided into two types: the first type of license-free transmission (also known as the first type of configured authorization (Configured Grant Type 1) transmission) and the second type of license-free transmission (also It is called the second type of configuration authorization (Configured Grant Type 2) transmission). For the first type of unlicensed transmission, only RRC signaling is used to configure unlicensed resources, and DCI is not required for resource configuration. For the second type of unlicensed transmission, RRC signaling and DCI need to be used to configure the unlicensed resources. Among them, RRC signaling is used to configure parameters including period, and DCI is used to activate and deactivate the second type of unlicensed transmission configuration. The DCI used for activation includes other parameters such as time-frequency allocation. The UE can use the configured unlicensed transmission resource only after receiving the activated DCI. Parameters used to configure the RRC signaling for the first type of unlicensed transmission, RRC signaling used to configure the second type of unlicensed transmission, and parameters configured for DCI. For details, see the standard 3GPP TS 38.331. To repeat.

The DCI in the embodiment of the present application may specifically be a DCI configured to activate the second type of unauthorized transmission. In the second type of unlicensed transmission, after receiving the DCI for activating the second type of unlicensed transmission configuration, as long as there is an uplink data transmission requirement, the UE can use the DCI and configure the second type of unlicensed transmission for RRC signaling. The configured parameters send data. It can be understood that the DCI used to activate the second type of unlicensed transmission configuration is not sent for a certain uplink data transmission requirement, but after it activates the second type of unlicensed transmission configuration, the UE has any uplink data transmission requirements It is possible to use the second type of unlicensed transmission mode for uplink data transmission. Therefore, the DCI used to activate the second type of unlicensed transmission configuration can also be understood as a type of DCI used to schedule the terminal device to send data. It should be noted that since the channel used by the UE for unlicensed transmission is a physical uplink shared channel (PUSCH), and the configuration of the unlicensed transmission resource requires RRC signaling, therefore, the UE uses an unlicensed The channel used to send data is called higher-layer configured PUSCH (Higher Layer Configured PUSCH), and can also be called configured authorized PUSCH (Configured Grant PUSCH, CG PUSCH). The transmission of unlicensed data is called higher-layer configured transmission (Higher Layer Configured Transmission). In an example of the application, the DCI in step S501 further includes DCI used for scheduling retransmission in the unlicensed transmission mode. For example, when the UE transmits uplink data packet A in the first type of unlicensed transmission mode or the second type of unlicensed transmission mode, the network device may send a DCI for scheduling the retransmission for the uplink data packet A to schedule the UE to perform the DCI based on the DCI. The configured parameters instead of continuing to retransmit packet A using the original license-free transmission configuration.

In an example of the present application, the network device may determine a search space for sending DCI according to a scheme for scheduling the terminal device to send uplink data packets. For example, if the network device determines that the scheme for scheduling the terminal device to send uplink data packets is to send multiple times In the first solution of the uplink data packet, the network device may determine that the search space for sending the DCI is the first search space. Accordingly, in step S502, the network device may send the DCI using the first search space. If the network device determines that the scheme for scheduling the terminal device to send the uplink data packet is the second scheme for sending the uplink data packet only once, the network device may determine that the search space used to send the DCI is the second search space. Accordingly, in In step S502, the network device may use the second search space to send the DCI, the first search space is different from the second search space, and the first search space is used to instruct the terminal device to send an uplink data packet. In a solution, the second search space is used to instruct the terminal device to send an uplink data packet as a second solution.

In another example of the present application, the network device may determine the scramble code of the DCI according to a scheme for scheduling the terminal device to send uplink data packets, for example, if the network device determines that the scheme for scheduling the terminal device to send uplink data packets is multiple times In a first scheme for sending an uplink data packet, the network device may scramble the DCI using a first scrambling code. Accordingly, in step S502, the network device may send the DCI scrambled using the first scrambling code. If the network device determines that the scheme for scheduling the terminal device to send the uplink data packet is the second scheme for sending the uplink data packet only once, the network device may use the second scrambling code to scramble the DCI. Accordingly, in step S502 , The network device may send the DCI scrambled using a second scrambling code, where the first scrambling code is used to instruct the terminal device to send the uplink data packet as the first solution, and the second scrambling code The scrambling code is used to indicate that a scheme in which the terminal device sends the uplink data packet is a second scheme.

It should be further explained that, in the embodiment of the present application, if the DCI is specifically used to schedule a terminal device to retransmit uplink data packets, the network device may use the RV of the DCI to indicate the number of retransmissions of the uplink data, and the redundant version indicates The field is used to indicate the number of times to retransmit uplink data packets. For example, in an example of this application, the network device may use the value indicated by the redundant version indication field to indicate the number of times to retransmit uplink data. For example, RV = 10 is available. , Instruct the terminal device to retransmit the uplink data packet 2 times, and RV = 11 can be used to instruct the terminal device to retransmit the uplink data packet 3 times. In another example of the present application, the network device may use a value indicated by the redundant version indication field to indicate a target retransmission number, a sequence number in a preset retransmission number set, and the target retransmission number is a terminal device. Number of retransmissions of uplink packets. For example, the entire set of retransmission times includes three retransmission times, respectively, the number of retransmissions corresponding to candidate value 1, the number of retransmissions corresponding to candidate value 2, and the number of retransmissions corresponding to candidate value 3. The network device may use RV = 01 to indicate the number of retransmissions corresponding to candidate value 1, use RV = 10 to indicate the number of retransmissions corresponding to candidate value 2, and use RV = 11 to indicate the number of retransmissions corresponding to candidate value 3. Step S502: The network device sends DCI.

Step S503: The terminal device receives the DCI.

Step S504: The terminal device determines a scheme for sending an uplink data packet according to the search space or scrambling code of the DCI.

In the embodiment of the present application, the search space of the terminal device may be configured in advance as a first search space and a second search space. The terminal device can monitor the DCI in the first search space and the second search space. If DCI is monitored in the first search space, the search space of the DCI may be determined as the first search space, otherwise, the search space of the DCI is determined as the second search space.

In the embodiment of the present application, the scrambling code of the terminal device may be configured in advance as a first scrambling code and a second scrambling code. After receiving the DCI, the terminal device can use the first scrambling code and the second scrambling code to descramble the DCI. If the first scrambling code is used to successfully descramble the DCI, the DCI scrambling code can be determined. Is the first scrambling code; otherwise, it is determined that the scrambling code of the DCI is the second scrambling code.

In an example of the present application, if the search space is a first search space, a scheme for sending the uplink data packet is determined to be a first scheme; if the search space is a second search space, it is determined to send the uplink data The package scheme is a second scheme, and the first search space is different from the second search space. For example, the first search space may be a public search space, the second search space may be a terminal device-specific search space, or the first search space is a terminal device-specific search space, and the second search space is a public search space.

In another example of the present application, if the scrambling code is a first scrambling code, determine a scheme for sending the uplink data packet as a first scheme; if the scrambling code is a second scrambling code, determine A scheme for sending the uplink data packet is a second scheme, and the first scrambling code is different from the second scrambling code.

In the embodiment of the present application, after receiving the DCI, the terminal device may determine a scheme for sending an uplink data packet according to a search space or a scrambling code of the DCI. In an example of the present application, the terminal device may determine a scheme for sending an uplink data packet according to a search space of the DCI. For example, if a search space for sending the DCI is a first search space, the terminal device sends uplink data The packet scheme may be a first scheme. If the search space used to send the DCI is a second search space, the terminal device may determine that the scheme for sending an uplink data packet is a second scheme, and the first search space and the second search space are The spaces are different. For example, the first search space may be a public search space, the second search space may be a UE-specific search space, or the first search space is a UE-specific search space and the second search space is a public search space. In another example of the present application, the terminal device may use a scramble code of DCI to determine a scheme for sending an uplink data packet. For example, if the scramble code of the DCI is a first scrambling code, it may be determined that the terminal device sends an uplink data packet. The data packet scheme is the first scheme. If the DCI scrambling code is the second scrambling code, it can be determined that the terminal device sends an uplink data packet as the second scheme. The first scrambling code and the second scrambling code are the same. The scrambling codes are different, and the types of the first scrambling code and the second scrambling code are the same or different.

In the embodiment of the present application, a new data indication (NDI) field in the DCI received by the terminal device may be used to determine whether the DCI is used to schedule the terminal device to initially transmit uplink data packets or retransmit uplink data. package. For example, in one example, if the NDI of the DCI is a first value, the terminal device may determine that the current DCI schedules the terminal device to initially transmit an uplink data packet. If the NDI of the DCI is a second value, the terminal device may determine that the current DCI schedules the terminal device to retransmit the uplink data packet, and the first value is different from the second value. In another example of this application, for the same Hybrid Automatic Repeat Request (HARQ) process of a terminal device, the terminal device may also determine whether the NDI values in adjacent DCIs carrying the same HARQ process number are the same ( Or called flipping) to determine whether the current DCI schedules the terminal device to initially transmit uplink data packets or retransmit uplink data packets. For example, if the values of NDI in adjacent DCI are the same (or the value of NDI in adjacent DCI is not reversed), it can be determined that the current DCI schedules the terminal device to retransmit uplink data packets. Different values (or NDI values in adjacent DCIs are reversed) can determine that the current DCI schedules the terminal device to initially transmit uplink data packets.

Further, if the DCI sent by the network device is specifically a DCI for scheduling the terminal device to retransmit the uplink data packet, the terminal device may use the redundant version indication field of the DCI to determine the number of times to retransmit the uplink data packet. For example, in the embodiment of the present application, the terminal device may select a target retransmission number from a preset set of retransmission times according to the value indicated by the redundant version indication field, and the target retransmission number is the terminal device retransmission number. Number of transmissions of uplink data packets. The above example is still used. The entire set of retransmission times includes 3 retransmission times, which are the retransmission times corresponding to candidate value 1, the retransmission times corresponding to candidate value 2, and the retransmission times corresponding to candidate value 3. . If RV = 11, the terminal device can determine the number of retransmissions corresponding to the candidate value 3 as the target retransmission number. Similarly, if RV = 10, the terminal device can determine the number of retransmissions corresponding to the candidate value 2 as the target retransmission number. Number of passes. In an embodiment, the candidate value may be a sequence number or an index of a certain number of retransmission times in a set of retransmission times.

Optionally, in an example of this application, the network device may also use the value represented by RV to specifically indicate the number of times the terminal device retransmits the uplink data. For example, using RV = 10, it means that the number of times the terminal device retransmits the uplink data is 2 times. Correspondingly, when receiving the DCI, the terminal device may determine the number of times the terminal device retransmits the uplink data packet according to the value indicated by the redundancy version indication field in the DCI.

Optionally, in another example of the present application, the network device may use the redundancy version indication field to indicate an adjustment factor f, and the adjustment factor f is used to determine the number of retransmissions of uplink data. For example, the network device may configure the number of retransmissions K1 for the terminal device through high-level signaling. After receiving the DCI for scheduling retransmission, the terminal device determines the uplink according to the adjustment factors f and K1 indicated by the redundant version indication field in the DCI. The number of data retransmissions K2, for example, K2 = floor (f * K1) or K2 = ceil (f * K1), where floor and ceil respectively represent downward or upward rounding, and the value of the adjustment factor f can be 0.5, 1,2 and other integers or non-integer.

As can be seen from the above, in the embodiments of the present application, the search space or scrambling code of the DCI may be used to determine the number of times that the terminal device retransmits the uplink data packet. In contrast, an additional indication field is added to the DCI to indicate the retransmission uplink The number of data packets can reduce air interface overhead, reduce DCI overhead, and save physical downlink control channel resources.

Regarding the process shown in FIG. 5 above, this application provides a specific implementation manner. In this implementation manner, a first solution that a terminal device can send uplink data packets multiple times is referred to as multiple aggregation or repetition of uplink data. The second solution that the terminal device sends the uplink data packet only once is called no aggregation or repetition of the uplink data, and specifically provides the following two implementations:

First implementation: The terminal device determines whether the terminal device performs aggregation or repeated transmission when sending an uplink data packet according to the DCI according to the search space where the DCI is received.

In the embodiments of the present application, the search space where the DCI is located is also referred to as the search space where the PDCCH is located, or the search space where the UL grant is located.

In an example of the present application, if the search space is a common search space, the terminal device aggregates or repeatedly sends uplink data packets multiple times according to the aggregation factor or the number of repetitions configured by the upper layer when sending data; if the search space is a UE-specific search Space, the terminal device does not perform aggregation or repeated transmission when sending uplink data packets, or only sends one aggregation or one repeated or single transmission of uplink data packets.

In another example of the present application, if the search space is a UE-specific search space, the terminal device sends data in multiple aggregations or repetitions according to an aggregation factor or the number of repetitions configured by a higher layer when transmitting data; if the search space is a public search Space, the terminal device does not perform aggregation or repeated transmission when transmitting data, or only transmits one aggregation or one repeated or single transmission of data.

Second implementation: The terminal device determines whether the terminal device performs aggregation or repeated transmission when transmitting an uplink data packet according to the DCI or the uplink authorization according to the RNTI used to scramble the DCI or uplink authorization, or is called whether to transmit Multiple aggregations or repetitions of the uplink data packet:

In an example of the present application, if it is the first RNTI, the terminal device sends multiple aggregations or repetitions of uplink data packets according to the aggregation factor or repetition number configured by the upper layer when sending data; if it is the second RNTI, the terminal When the device sends uplink data packets, no aggregation or repeated transmission is performed, or only one aggregation or one repeated or single transmission of the data packets is sent.

The first RNTI may be C-RNTI or CS-RNTI or Y-RNTI or MCS-C-RNTI or U-RNTI or other types of RNTI. The second RNTI may also be C-RNTI or CS-RNTI or Y-RNTI. Or MCS-C-RNTI or U-RNTI or other types of RNTI, and the first RNTI is different from the second RNTI.

In the embodiments of the present application, the aggregation or repetitive dynamic switching is implemented in an implicit manner without increasing the DCI signaling overhead, so as to quickly match the different requirements for delay and reliability of different data transmissions to improve data. Transmission effect.

As shown in FIG. 6, this application provides a communication method. The communication method is mainly applied to a scheme for instructing a terminal device to receive a downlink data packet. The scheme for a terminal device to receive a downlink data packet may be a third scheme for receiving a downlink data packet multiple times. , Or the fourth scheme for receiving downlink data packets only once, as shown in FIG. 6, the method may specifically be:

Step S601: The network device generates a DCI, which is used to schedule a terminal device to receive a downlink data packet.

In an example of the present application, the network device may determine a search space for transmitting DCI according to a scheme in which the terminal device receives a downlink data packet. For example, if the network device determines that the scheme for scheduling the terminal device to receive downlink data packets is the third scheme for multiple receptions, the search space for transmitting DCI may be the first search space. Accordingly, in step S602, the network device may The DCI is transmitted using a first search space, where the first search space is used to instruct the terminal device to receive a downlink data packet as a third solution. If the scheme for the network equipment to schedule the terminal equipment to receive the downlink data packet is the fourth scheme for only receiving once, then the search space for transmitting DCI may be the second search space. Accordingly, in step S602, the network equipment may use the second The search space transmits DCI, and the second search space is used to instruct the terminal device to receive a downlink data packet as a fourth solution. The first search space is different from the second search space. For example, the first search space may be a public search space, the second search space may be a UE-specific search space, or the first search space may be a UE-specific search space. The second search space may be a public search space.

It can be understood that the scheme in which the first search space indicates that the terminal device receives the downlink data packet is the third scheme, and it can also be understood that the first search space indicates that the downlink data is sent multiple times. The understanding of the second search space is similar.

In another example of the present application, the network device may determine a scrambling code used to scramble the DCI according to a scheme in which the terminal device receives a downlink data packet. For example, if the network device determines that the scheme for scheduling the terminal device to receive the downlink data packet is the third scheme for multiple receptions, the DCI may be scrambled by using the first scrambling code. Accordingly, in step S602, the first The scrambled DCI is scrambled, and the first scrambling code is used to indicate that a scheme in which the terminal device receives the downlink data packet is a third scheme. If the network device determines that the scheme for scheduling the terminal device to receive the downlink data packet is the fourth scheme for only receiving once, then the DCI may be scrambled using the second scrambling code. Accordingly, in step S602, the second scrambling code is used to send After scrambled DCI, the second scrambling code is used to indicate that a scheme in which the terminal device receives the downlink data packet is a fourth scheme.

It can be understood that the scheme in which the first scrambling code indicates that the terminal device receives the downlink data packet is the third scheme, and it can also be understood that the first scrambling code indicates that the downlink data is sent multiple times. The understanding of the second scrambling code is similar.

Step S602: The network device sends DCI.

Step S603: The terminal device receives the DCI.

Step S604: The terminal device determines a scheme for receiving a downlink data packet according to the search space or scrambling code of the DCI.

In the embodiment of the present application, for the process of determining the search space or scrambling code of the DCI by the terminal device, reference may be made to the description of step S504 above, and details are not described herein again.

In an example of the present application, if the search space is a first search space, it is determined that a scheme for receiving the downlink data packet is a third scheme; if the search space is a second search space, it is determined that the downlink data is received. The package solution is the fourth solution. The first search space is different from the second search space. For example, the first search space may be a public search space, and the second search space may be a UE-specific search space. Or, the first search space is a UE-specific search space, and the second search space is a public search space.

In another example of the present application, if the scrambling code is a first scrambling code, determine a scheme for receiving the downlink data packet as a first scheme; if the scrambling code is a second scrambling code, determine A scheme for receiving the downlink data packet is a second scheme, and the first scrambling code is different from the second scrambling code.

Further, in the embodiment of the present application, if the DCI is specifically used to schedule a terminal device to receive a retransmitted downlink data packet, the network device may also use the redundancy version indication field of the DCI to instruct the terminal device to receive the number of retransmitted downlink data packets. For example, in an example of the present application, the network device may use the value indicated by the redundant version indication field of the DCI to indicate the sequence number of the target retransmission times in a preset retransmission times set, the preset retransmission times Collections can be pre-configured. For example, the entire set of preset retransmission times includes three retransmission times, respectively, the number of retransmissions corresponding to candidate value 1, the number of retransmissions corresponding to candidate value 2, the number of retransmissions corresponding to candidate value 3, and the candidate value. The size may be specifically the number of retransmission times. For example, in the embodiment of the present application, the network device may use RV = 10 to indicate the number of retransmissions corresponding to candidate value 2, and use RV = 11 to indicate the number corresponding to candidate value 3. Number of retransmissions. Correspondingly, after the terminal device receives the DCI for scheduling the terminal device to receive the retransmitted downlink data packets, the terminal device may use the value indicated by the redundant version indication field of the DCI to indicate that the target retransmission number is within a preset retransmission time. The serial number in the collection. For example, RV = 10, the number of retransmissions corresponding to the candidate value 2 may be determined as the target number of retransmissions.

Optionally, in the embodiment of the present application, the network device may use the DCI redundant version indication field. The indicated value directly indicates the number of times that the terminal device receives downlink data. For example, the network device may use RV = 10 to indicate the terminal device. The number of times a downlink packet is received is two. Correspondingly, after receiving the DCI, the terminal device can use the redundant version indication field of the DCI to determine the number of times to receive downlink data packets. For example, if DCI has RV = 10, the terminal device may determine that the number of times that the downlink data packet is currently received is two.

Step S605: The network device sends a downlink data packet according to the indicated receiving scheme.

In the embodiment of the present application, if it is determined in step S601 that the number of downlink data packets received by the terminal device is multiple times, the network device may send the downlink data packets multiple times. If it is determined in step S601 that the number of downlink data packets received by the terminal device is one time, the network device may send the downlink data packets only once.

Step S606: The terminal device receives a downlink data packet according to the determined receiving scheme.

As can be seen from the above, in the embodiments of the present application, the search space or scrambling code of the DCI can be used to determine the number of times that the terminal device receives the downlink data packet. In contrast, an additional indication field is added to the DCI to instruct the terminal device to receive the downlink data packet. The number of data packets can reduce air interface overhead, reduce DCI overhead, and save physical downlink control channel resources.

For the process shown in FIG. 6 above, this application provides a specific implementation manner. In this implementation manner, a third solution that a terminal device may receive downlink data packets multiple times is referred to as multiple aggregation or repetition of downlink data. The fourth solution that the terminal device receives the downlink data packet only once is called no aggregation or repetition of the downlink data, and specifically provides the following two implementations:

First implementation manner: The terminal device determines whether the terminal device performs aggregation or repeated reception when receiving data according to the received DCI or PDCCH or downlink scheduling (DL scheduling), or whether the terminal device receives data. Aggregate or repeat multiple times:

In one example, if the search space is a common search space, the terminal device receives data in multiple aggregations or repetitions according to an aggregation factor or the number of repetitions configured at a high level when receiving data; if the search space is a UE-specific search space, then When the terminal device receives data, it only receives one aggregation of data or one repeated or single transmission.

In another example, if the search space is a UE-specific search space, the terminal device receives the data according to an aggregation factor or the number of repetitions configured at a high level, and the data is aggregated or repeated multiple times; if the search space is a common search space, The terminal device does not perform aggregation or repeated reception when receiving data, or receives only one aggregation or one repeated or single transmission of data.

The second implementation manner: The terminal device determines whether the terminal device performs aggregation or repeated reception when receiving data according to the DCI or downlink scheduling, or whether it receives data multiple times. Aggregate or repeat:

In one example, if it is the first RNTI, the terminal device receives data in multiple aggregations or repetitions according to the aggregation factor or the number of repetitions configured by the higher layer; if it is the second RNTI, the terminal device is receiving data No aggregation or repeated reception is performed, or only one aggregation or one repeated or single transmission of data is received.

In the embodiment of the present application, on the premise that the DCI signaling overhead is not increased, aggregation or repetitive dynamic switching is implemented to quickly match different data transmission requirements for different delays and reliability, and improve the data transmission effect.

Based on the above, as shown in FIG. 7a, the present application also provides a communication method, which can be used in the process of data retransmission. The communication method is mainly used to instruct the terminal device to retransmit the uplink data packets, as shown in FIG. 7a. The method is specifically:

Step S701: The network device generates DCI.

Step S702: The network device sends the DCI, the DCI is used to schedule the terminal device to retransmit the uplink data packet, and the redundancy version indication field in the DCI is used to indicate the number of retransmissions of the uplink data packet.

In the embodiment of the present application, regarding how the network device uses the redundant version indication field of the DCI to instruct the terminal device to retransmit the uplink data packet, refer to the introduction in FIG. 5.

Step S703: The terminal device receives the DCI.

Step S704: The terminal device determines the number of times the terminal device retransmits the uplink data packet according to the redundancy version indication field in the DCI.

In the embodiment of the present application, if the redundant version indication field in the DCI indicates K2 times, the terminal device may determine that the number of retransmissions of the uplink data packet is K3 times, and the K3 may be less than or equal to the K2.

In the embodiment of the present application, for how the terminal device determines the number of times of retransmitting the uplink data packet according to the DCI redundant version indication field, refer to the description in FIG. 5 described above. Further, the terminal device may retransmit the uplink data packet according to the determined sending times.

Since the DCI originally includes a redundant version indication field, it is used to indicate a redundant version. In the embodiment of the present application, the redundant version indication field is used to indicate the number of times that the terminal device retransmits the uplink data packet. That is, in the embodiment of the present application, the redundant version indication field is no longer used to indicate the redundant version. Instead, it is used to indicate the number of retransmissions of uplink data packets. Because in the existing scheme, the DCI includes a redundant version indication field, that is, in the embodiment of the present application, the number of times that the terminal device can send an uplink data packet without increasing the DCI overhead can be reduced. The air interface overhead saves the resources of the physical downlink control channel.

For the process shown in FIG. 7a above, this application provides a specific implementation. In this specific implementation: When receiving a DCI or PDCCH or uplink grant for scheduling data retransmission, the terminal device may The indication field indicating the redundant version determines the aggregation factor or number of repetitions used when retransmitting the data.

In an example of the present application, the terminal device may directly determine the aggregation factor or the number of repetitions through the redundant version indication field. For example, when the RV indication field is 00, the aggregation factor or repetition number is 1, and when the RV indication field is 01, the The aggregation factor is 2.

In another example of the present application, the terminal device may also determine, through a redundant version indication domain, one aggregation factor or repetition times from multiple candidate values of aggregation factors or repetition times configured at a higher layer, for example, four candidate values are configured at a higher layer. , 1, 2, 4, 8 respectively, when the RV indication field is 00, it is used to indicate that the aggregation factor or the number of repetitions determined by the terminal device is the first of the four candidate values, namely 1, when the RV indication field is At 01, it is used to indicate that the aggregation factor or repetition determined by the terminal device is the second of the four candidate values, namely 2, when the RV indication field is 10, it is used to indicate the aggregation factor or repetition determined by the terminal device. The number of times is the third of the four candidate values, that is, 4, when the RV indication field is 11, it is used to indicate that the aggregation factor or the number of repetitions determined by the terminal device is the fourth of the four candidate values, that is, 8.

In another example of the present application, the terminal device may determine the adjustment factor f through the redundant version indication field, and further determine the aggregation factor or the number of repetitions according to the determined adjustment factor f. An implementation manner is that the terminal may determine the number of retransmissions of the uplink data packet K2 according to the determined adjustment factor f and the aggregation factor or the number of repetitions K1 configured by the high-level parameters, for example, K2 = floor (f * K1) or K2 = ceil (f * K1), where floor and ceil represent rounding down or up respectively, and the value of the adjustment factor can be an integer such as 0.5, 1, 2, or a non-integer.

It should be noted that, in the embodiment of the present application, when the terminal device performs aggregation repetition and receives aggregation or repetition according to aggregation, the following method can be used to determine the redundancy version used by the nth aggregation or repetition:

The first method is to determine the indication domain according to the redundancy version carried by the DCI used to schedule the initial transmission or the first transmission of the data.

Specifically, in the embodiment of the present application, the redundant version indication field carried by the DCI that schedules the initial transmission or first transmission of the data may be determined first, the redundant version of the initial transmission may be determined, and then the first n aggregations or repetitions, the redundant version used indicates the domain.

For example, as shown in Table 1, the value of n can be any one of {0,1,2, ..... K-1}, if used to schedule the RV carried in the DCI for initial transmission or first transmission = 0, and the value of n modulo 4 is 0. Then, it can be determined that the n-th aggregation or repetition is used, and the redundant version indication field used is 0.

Table 1

For another example, as described in Table 2, the value of n is any one of {1, 2 ..... K}, if RV = 0 carried in the DCI used for scheduling the initial transmission or the first transmission, and The value of (n-1) modulo 4 is 0. Then, the nth aggregation or repetition can be determined, and the redundancy version indication field used is 0.

Table 2

The second method: determine according to the RV used in the initial transmission or the last aggregation or repetition in the first transmission.

Specifically, in the embodiment of the present application, the redundant version indication field used in the first transmission or the last aggregation or repetition in the first transmission may be determined first, and then the n-th aggregation or retransmission is determined according to the value of n modulo 4. The redundant version used indicates the domain.

For example, as shown in Table 3, the value of n is any one of {0,1,2, ..... K-1}. If the initial transmission or the last aggregation in the first transmission or the redundancy used is repeated, The remaining version indication field is 0, and the value of n modulo 4 is 2, then the nth aggregation or repetition can be determined, and the used redundant version indication field is 1.

table 3

For another example, as shown in Table 4, the value of n is any one of {1, 2… ..K}, if the initial transmission or the last aggregation in the first transmission or the redundancy version used indicates The domain is 0, and the value of (n-1) modulo 4 is 1, then the nth aggregation or repetition can be determined, and the redundant version used indicates that the domain is 3.

Table 4

The third method: Determine according to the sequence of redundant versions configured at a high level.

Specifically, the sequence of redundant versions configured at a high level may be {RV-1, RV-2, RV-3, RV-4}, and the redundant version of the nth iteration or aggregation is the (nmod4) th in the sequence +1 value, for example, when n mod 4 = 0, the redundant version is the first value in the sequence of redundant versions configured at a high level, that is, RV-1; when n mod 4 = 1, the redundant version is configured at a high level The second value in the redundant version sequence, RV-2; and so on. The sequence of redundant versions for high-level configuration can be {0,2,3,1}, or {0,3,0,3} or {0,0,0,0}, etc.

In the embodiment of the present application, in an implicit manner, the dynamic adjustment of the aggregation factor or the number of repetitions is implemented without increasing the premise of DCI signaling overhead, so as to quickly match the different requirements for delay and reliability of different data transmissions. Improve data transmission.

Based on the above, as shown in FIG. 7b, the present application further provides a communication method, which can be used in the process of data retransmission. The communication method is mainly used to instruct the terminal device to retransmit the uplink data packet, as shown in FIG. 7b. The method is specifically:

Step S711: The network device generates DCI, where the DCI is used to schedule the terminal device to retransmit uplink data packets. The DCI carries a repetition number field and does not carry a redundant version field. The repetition number field is used to indicate the uplink data packet. Number of retransmissions.

Step S712: The network device sends the DCI.

Step S713: The terminal device receives the DCI.

Step S714: The terminal device determines the number of times the terminal device retransmits the uplink data packet according to the repetition number field in the DCI.

In the embodiment of the present application, if the number of retransmissions determined according to the repetition number field in the DCI is K4, the terminal device may determine that the number of retransmissions of uplink data packets is K5, and the K5 may be less than or equal to the K4 .

Further, the terminal device may retransmit the uplink data packet according to the determined sending times.

In an embodiment of the present application, when generating a DCI for scheduling a terminal device to retransmit uplink data packets, the network device may replace the redundant version field in the existing DCI format (for example, DCI format 0_0 / 0_1). It is a repetition number field with the same number of bits without changing the DCI format type. For example, when a terminal device is scheduled to retransmit uplink datagrams, the redundant version field in the existing DCI format 0_0 will be replaced with the same number of repetitions field. In other scenarios, the redundant version field will not be replaced. . Since the number of repetitions field is replaced by a redundant version field, the DCI overhead (the length of the DCI bit) and the type of the DCI format will not be increased, and the number of times that the terminal device sends an uplink data packet is indicated by the number of repetitions field. It can reduce the air interface overhead and save the resources of the physical downlink control channel.

Regarding the process shown in FIG. 7b, the present application provides a specific implementation. In this specific implementation, when a terminal device receives a DCI or a PDCCH or an uplink grant for scheduling data retransmission, according to the repetition carried in the DCI The number of times field determines the aggregation factor or number of repetitions used when retransmitting the data.

In an example of the present application, the terminal device may directly determine the aggregation factor or the number of repetitions through the repetition number field. For example, when the number of repetitions field is 00, the aggregation factor or number of repetitions is 1, and when the number of repetitions field is 01, the aggregation factor is indicated. Is 2.

In another example of the present application, the terminal device may further determine an aggregation factor or the number of repetition times from multiple aggregation factors or the number of repetition times candidates configured in the upper layer through the repetition number field. For example, four candidate values are configured in the upper layer, respectively. When it is 1, 2, 4, 8 and the number of repetitions field is 00, it is used to indicate the aggregation factor or the number of repetitions is the first of the four candidate values, which is 1, when the number of repetitions field is 01, it is used to refer to aggregation The factor or the number of repetitions is the second of the four candidate values, which is 2, when the repetition number field is 10, it is used to indicate that the aggregation factor or the number of repetitions is the third of the four candidate values, which is 4, when the repetition is When the number of times is 11, it is used to indicate that the aggregation factor or the number of repetitions is the fourth of the four candidate values, which is 8.

In another example of the present application, the terminal device may determine the adjustment factor f through the repetition number field, and further determine the aggregation factor or the number of repetitions according to the determined adjustment factor f. An implementation manner is that the terminal may determine the number of retransmissions of the uplink data packet K4 according to the determined adjustment factor f and the aggregation factor or repetition number K1 configured by the high-level parameters, for example, K4 = floor (f * K1) or K4 = ceil (f * K1), where floor and ceil represent rounding down or up respectively, and the value of the adjustment factor can be an integer such as 0.5, 1, 2, or a non-integer.

It should be noted that, in the embodiment of the present application, how to determine the redundant version used for the n-th aggregation or repetition can be specifically referred to the description of the specific implementation manner shown in FIG. 7a above.

In the embodiment of the present application, by replacing the redundant version field in the DCI with the repetition number field with the same number of bits, the dynamic adjustment of the aggregation factor or the number of repetitions is achieved without increasing the DCI signaling overhead, so as to quickly match Different data transmission has different requirements on delay and reliability, which improves the data transmission effect.

Based on the above, as shown in FIG. 8a, the present application further provides a communication method, which can be used in the process of data packet retransmission. The communication method is mainly used to indicate the number of times to retransmit downlink data packets. The method specifically includes:

Step S801: The network device generates DCI, the DCI is used to schedule the terminal device to retransmit downlink data packets, and the redundant version indication field of the DCI is used to indicate the number of times that the downlink data packet is received for retransmission.

Step S802: The network device sends DCI.

Step S803: The terminal device receives the DCI.

Step S804: The terminal device determines, according to the redundancy version indication field in the DCI, the number of times the terminal device receives the retransmitted downlink data packet.

Regarding how the network device uses the redundant version indication field of the DCI to instruct the terminal device to receive the retransmission downlink data packet times, and how the terminal device determines the number of times to receive the retransmitted downlink data packet according to the DCI redundant version indication field, See the introduction of the method shown in Figure 6 above.

Step S805: The network device sends a downlink data packet according to the indicated number of retransmissions.

Step S806: The terminal device receives a downlink data packet according to the determined number of retransmissions.

It can be seen from the above that in the embodiment of the present application, the number of times that a terminal device receives a downlink data packet can be instructed without additional DCI overhead, thereby reducing air interface overhead and saving resources of a physical downlink control channel.

In the embodiment of the present application, for the process shown in FIG. 8a above, the present application provides an implementation manner, specifically: when the terminal device receives DCI or PDCCH or downlink scheduling for scheduling data retransmission, it is carried according to the DCI The indication field for indicating a redundant version determines the aggregation factor or number of repetitions used when receiving a retransmission of the data. Regarding how to determine the aggregation factor or the number of repetitions according to the redundant version indication field, and how to determine the n-th aggregation or repetition, the redundant version used can be specifically referred to the description of the specific implementation manner shown in FIG. 7a above.

In the embodiment of the present application, the implicit adjustment of the aggregation factor or the number of repetitions is implemented without increasing the premise of DCI signaling overhead, so as to quickly match different data transmission requirements for delay and reliability, and improve Data transmission effect.

Based on the above, as shown in FIG. 8b, the present application also provides a communication method, which can be used in the process of retransmitting a data packet. The communication method is mainly used to determine the number of times to retransmit a downlink data packet. The method specifically includes:

Step S811: the network device generates DCI, the DCI is used to schedule the terminal device to receive the retransmitted downlink data packet, the DCI carries a repetition number field and does not carry a redundant version field, and the repetition number field is used to indicate receiving a retransmission Number of downlink packets.

Step S812: The network device sends DCI.

Step S813: The terminal device receives the DCI.

Step S814: The terminal device determines, according to the repetition number field in the DCI, the number of times the terminal device receives the retransmitted downlink data packet.

Step S815: The network device sends a downlink data packet according to the indicated number of retransmissions.

Step S816: The terminal device receives a downlink data packet according to the determined number of retransmissions.

As can be seen from the above, in the embodiment of the present application, the redundant version field in the existing DCI is replaced by the number of repetitions field with the same number of bits, and the terminal can be instructed without additional DCI overhead and DCI format type. The number of times the device receives downlink data packets, thereby reducing air interface overhead and saving resources on the physical downlink control channel.

In the embodiment of the present application, with regard to the process shown in FIG. 8b, the present application provides an implementation manner, specifically: when the terminal device receives DCI or PDCCH for downlink data retransmission scheduling or downlink scheduling, according to the DCI The field carrying the number of repetitions determines the aggregation factor or number of repetitions used when receiving the retransmission of the data. Regarding how to determine the aggregation factor or the number of repetitions according to the repetition number field, and how to determine the n-th aggregation or repetition, the redundant version used can refer to the specific implementation manner shown in FIG. 7b above.

In the embodiment of the present application, by replacing the redundant version field in the DCI with the number of repetitions field having the same number of bits, and using the number of repetitions field to indicate the number of retransmissions, the aggregation factor or Dynamic adjustment of the number of repetitions to quickly match the different requirements of different data transmissions on delay and reliability, and improve data transmission results.

It should be noted that, in the embodiment of the present application, with respect to the processes shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b, the order of execution between different steps is not limited. In 8a, step S805 may be located after step S804, and step S805 may also be located before step S804.

In the embodiment of the present application, the processes shown in FIG. 5, FIG. 6, FIG. 7 a, FIG. 7 b, FIG. 8 a, and FIG. 8 b may be specifically applied to a request-scheduled transmission scenario, and may also be used for semi-static scheduling. In the scenario of semi-persistent scheduling (SPS) transmission, it can also be applied to the scenario of license-free transmission. The principle of semi-static scheduling is that before a network device sends downlink data, the network device may first send an activated DCI, which is used to schedule downlink data transmission and indicate time-frequency domain resources of the downlink data. Correspondingly, after receiving the activated DCI, the terminal device may receive the downlink data sent by the base station on the corresponding time-frequency domain resources according to the indication of the DCI. Subsequent network devices may continue to send downlink data according to the pre-configured period P. Accordingly, the terminal device may continue to receive downlink data according to the pre-configured period P. It can be seen that in the SPS technology, a network device can realize multiple downlink data transmissions by sending an activated DCI. Compared with the prior art, the network device sends an activated DCI before sending downlink data each time, which can reduce signaling overhead. The DCI in the embodiment of the present application may specifically be activated DCI in an SPS scenario.

The authorization-free transmission scenario may also be referred to as a scheduling-free transmission scenario, a dynamic scheduling-free transmission scenario, a dynamic authorization-free transmission scenario, or a high-level configuration transmission scenario. Regarding the license-free transmission scenario, refer to the description of step S501 above, which is not repeated here.

In the embodiment of the present application, the processes shown in FIG. 5, FIG. 6, FIG. 7 a, FIG. 7 b, FIG. 8 a, and FIG. 8 b may also be applied to the initial transmission of data or the scenario of data retransmission. The first transmission of data can also be called the first transmission of data. The specific process is as follows: In wireless communication systems, in order to ensure the reliability of data transmission, the following mechanism is generally used. The sending end sends a data packet, and the receiving end receives the downlink. Data packet, and determine whether the data packet can be correctly demodulated, if the data packet can be demodulated correctly, a positive acknowledgement (for example, ACK) is sent back to the transmitting end; otherwise, a negative acknowledgement (for example, NACK) is fed back To the sender. If the sender receives a negative acknowledgement, the sender will retransmit the above data packet. In the embodiment of the present application, a process in which a sender first sends a data packet is referred to as initial transmission or first transmission of data, and a process of retransmitting a data packet according to feedback negative acknowledgement information is referred to as data retransmission. The transmitting end may be a network device 101 in the communication system shown in FIG. 1, or may be a terminal device 102 in the communication system shown in FIG. 1.

In the embodiment of the present application, in the uplink scenario, for the initial transmission or retransmission of an uplink data packet, the first scheme in which the uplink data packet is transmitted multiple times or the second scheme in which the uplink data packet is transmitted only once may be adopted. In the embodiment of the present application, the processes shown in FIG. 5, FIG. 7 a, and FIG. 7 b may be specifically applied to an initial transmission or retransmission process of an uplink data packet. In the downlink scenario, for the first transmission or retransmission of the next row data packet, the third scheme in which the downlink data packet is transmitted multiple times, or the fourth scheme in which the downlink data packet is transmitted only once may be adopted. In the embodiment of the present application, the processes shown in FIG. 6, FIG. 8 a, and FIG. 8 b may be specifically applied to a process of initial transmission or retransmission of a downlink data packet.

In an example of the present application, for the first transmission and retransmission of the data packet 1, the first solution of sending the data packet 1 multiple times may be adopted. Or, for the first transmission of the data packet 1, the second scheme of sending the data packet 1 once is adopted, and for the retransmission of the data packet 1, the first scheme of sending the data packet 1 multiple times is adopted. Alternatively, for the first transmission of data packet 1, the first scheme of transmitting data packet 1 multiple times is adopted, and for the retransmission of data packet 1, the second scheme of transmitting data packet 1 only once is adopted. Alternatively, for the first transmission and retransmission of data packet 1, the second solution of transmitting data packet 1 at a time is adopted. For the first transmission and retransmission of data 1, the first aspect of data packet 1 is taken and sent multiple times, as shown in FIG. 9.

For example, in the embodiment of the present application, the process shown in FIG. 5 may be applied to the first transmission or initial transmission of data, that is, the DCI or PDCCH or uplink grant received by the terminal device is used to schedule the terminal device for the first time or for the first time. send data.

In the embodiment of the present application, the process shown in FIG. 5 above may also be used for data retransmission, that is, the DCI or PDCCH or uplink grant received by the terminal device is used to schedule the terminal device to retransmit the data, that is, the initial transmission of data. When the first transmission is multiple aggregations or repetitions, the retransmission of the data may be multiple aggregations or repetitions, or one aggregation or one repetition or single transmission. The terminal device may determine according to the method in the first embodiment; When the terminal device determines that the retransmission is also multiple aggregations or repetitions, the number of aggregations or repetitions may be the same as the initial transmission or the first transmission, or may be the aggregation factor or the number of repetitions configured at a higher level.

For another example, in the embodiment of the present application, the process shown in FIG. 6 above may be used for the first transmission or initial transmission of data, that is, the DCI or PDCCH or downlink scheduling received by the terminal device is used to schedule the first or first reception of the terminal device. data.

In the embodiment of the present application, the above-mentioned process shown in FIG. 6 can also be used for data retransmission, that is, DCI or PDCCH or downlink scheduling received by the terminal device is used to schedule retransmission of data received by the terminal device, that is, data. When the initial transmission or the first transmission is multiple aggregations or repetitions, the retransmission of the data may be multiple aggregations or repetitions, or one aggregation or one repetition or single transmission. The terminal device may perform the method according to the second embodiment. OK; if the terminal device determines that the retransmission is also multiple aggregations or repetitions, the number of aggregations or repetitions may be the same as the initial transmission or the first transmission, or it may be the aggregation factor or the number of repetitions configured at a higher level.

In the embodiment of the present application, when the terminal receives DCI, it can determine whether the received DCI is a DCI for scheduling data retransmission according to the RNTI type used when the CRC bits of the DCI are scrambled and the NDI field in the DCI. If it is determined that the CRC (Cyclic Redundancy Check) bit of the DCI is used for scrambling, the RNTI used for the unauthorized transmission is a RNTI (Radio Network Temparory Identifier), such as CS-RNTI ( Configured Scheduling (RNTI), and the New Data Indicator (NDI) field carried in the DCI is set to 1, then the terminal determines that the DCI is a DCI for scheduling data retransmission. If the terminal device determines that the CRC of the CRC bits of the DCI is scrambled with C-RNTI (Cell RNTI), and the NDI domain carried in the DCI is compared with the previous DCI scrambled with C-RNTI The NDI domain is not toggled, so the terminal determines that the DCI is used for scheduling data retransmission, where the DCI and the previous DCI scrambled using C-RNTI carry the same HARQ process number.

Similar to the above concept, as shown in FIG. 10, an embodiment of the present application provides a communication device 1000. The communication device 1000 may include a transceiver unit 1001 and a processing unit 1002.

In an example of the present application, the communication device 1000 can be applied to a terminal device, and is configured to execute the steps in FIG. 5, FIG. 6, FIG. 7 a, FIG. 7 b, FIG. 8 a, and FIG.

For example, specifically, the transceiver unit 1001 may be configured to receive downlink control information from a network device, and the downlink control information may be used to schedule the terminal device to send an uplink data packet; and the processing unit 1002 may be configured to be configured according to the downlink control information. Search for a space or a scrambling code to determine a scheme for sending the uplink data packet, and the scheme for sending the uplink data packet may be a first scheme for sending the uplink data packet multiple times or only send the uplink data packet once In the second solution, the scrambling code is a codeword sequence that scrambles the downlink control information; the transceiver unit 1001 is further configured to send the uplink data packet to the network device according to the determined sending scheme.

For example, specifically, the transceiver unit 1001 may be configured to receive downlink control information from a network device, and the downlink control information may be used to schedule the terminal device to receive a downlink data packet; and the processing unit 1002 may be configured to be configured according to the downlink control information. Search space or scrambling code to determine a scheme for receiving the downlink data packet, and the scheme for receiving the downlink data packet may be a first scheme for receiving the downlink data packet multiple times or only receiving the downlink data packet once In the second solution, the scrambling code is a codeword sequence for scrambling the downlink control information; the transceiver unit 1001 is further configured to receive a downlink data packet from the network device according to the determined receiving scheme. .

For example, specifically, the transceiver unit 1001 may be configured to receive downlink control information from a network device, and the downlink control information may be used to schedule the terminal device to retransmit an uplink data packet; the processing unit 1002 may be configured to receive the downlink control information according to the downlink control information. The redundant version indication field in the frame determines the number of retransmissions of the uplink data packet; the transceiver unit 1001 is further configured to send the uplink data packet to the network device according to the determined number of retransmissions.

As another example, specifically, the transceiver unit 1001 may be configured to receive downlink control information from a network device, and the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet; the processing unit 1002 may be configured to The redundant version indication field in the downlink control information determines the number of times that the downlink data packet is received and retransmitted; the transceiver unit 1001 is further configured to receive the downlink data packet from the network device according to the determined number of retransmissions.

In another example of the present application, the communication device 1000 may be used in a network device, and is configured to execute the steps in FIG. 5, FIG. 6, FIG. 7 a, FIG. 7 b, FIG. 8 a, and FIG.

For example, specifically, the processing unit 1002 may be used to generate downlink control information, and the downlink control information is used to schedule a terminal device to send an uplink data packet; the transceiver unit 1001 may be used to send the downlink control information to the terminal device; , A search space for sending the downlink control information or a scrambling code of the downlink control information is used to indicate a scheme in which the terminal device sends the uplink data packet, and a scheme in which the terminal device sends the uplink data packet The scrambling code may be a first scheme for sending the uplink data packet multiple times or a second scheme for sending the uplink data packet only once, and the scrambling code is a codeword sequence for scrambling the downlink control information.

For example, specifically, the processing unit 1002 may be used to generate downlink control information, and the downlink control information is used to schedule a terminal device to receive a downlink data packet; the transceiver unit 1001 may be used to send the downlink control information to the terminal device; A search space for sending the downlink control information or a scrambling code of the downlink control information is used to instruct the terminal device to receive a downlink data packet solution, and the terminal device may receive a downlink data packet solution multiple times A first scheme for receiving the downlink data packet or a second scheme for receiving the downlink data packet only once, the scrambling code is a codeword sequence for scrambling the downlink control information; the transceiver unit 1001, And is further configured to send the downlink data packet to the terminal device according to the indicated receiving scheme.

For example, specifically, the processing unit 1002 is configured to generate downlink control information. The transceiver unit 1001 is configured to send the downlink control information to the terminal device, where the downlink control information is used to schedule the terminal device to retransmit the uplink data packet, and the redundant version indication field in the downlink control information is used to indicate the retransmission. Number of transmissions of uplink data packets.

For example, specifically, the processing unit 1002 is configured to generate downlink control information; the transceiver unit 1001 is configured to send the downlink control information to a terminal device, and the downlink control information is used to schedule the terminal device to receive retransmitted downlink data Packet, the redundant version indication field in the downlink control information is used to indicate the number of times that the terminal device receives and retransmits downlink data packets; the transceiver unit 1001 is further configured to send the terminal device to the terminal device according to the indicated number of retransmissions Sending the downlink data packet.

In this embodiment of the present application, for the specific introduction of the transceiver unit 1001 and the processing unit 1002, reference may be made to the descriptions of FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, and FIG. 8a and FIG. 8b.

Similar to the above concept, as shown in FIG. 11, the present application further provides a communication device 1100, which can be applied to the networks shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b The device can also be applied to the terminal devices shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, and FIG. 8a and FIG. 8b, which is not limited herein.

The communication device 1100 may include a processor 1101 and a memory 1102. Further, the apparatus may further include a receiver 1104 and a transmitter 1105. Furthermore, the apparatus 1100 may further include a bus system 1103.

The processor 1101, the memory 1102, the receiver 1104, and the transmitter 1105 may be connected through a bus system 1103. The memory 1102 is used to store instructions, and the processor 1101 is used to execute instructions stored in the memory 1102 to control the receiver 1104. Receive the signal and control the transmitter 1105 to send the signal to complete the steps of the network device or the terminal device in the above method.

The receiver 1104 and the transmitter 1105 may be the same or different physical entities, or may be the same physical entity, and may be collectively referred to as a transceiver. The memory 1102 may be integrated in the processor 1101, or may be provided separately from the processor 1101.

As an implementation manner, the functions of the receiver 1104 and the transmitter 1105 may be considered to be implemented through a transceiver circuit or a dedicated chip for transceiver. The processor 1101 may be considered to be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

As another implementation manner, it may be considered to use a computer to implement the network device or terminal device provided in the embodiment of the present application. The program code that is to implement the functions of the processor 1101, the receiver 1104, and the transmitter 1105 is stored in a memory, and the general-purpose processor implements the functions of the processor 1101, the receiver 1104, and the transmitter 1105 by executing the code in the memory.

For the concepts, explanations, and detailed descriptions and other steps related to the technical solution provided by the embodiment of the present invention related to this device, refer to the description of the content in the foregoing method or other embodiments, and will not be repeated here.

For example, in an example of the present application, the device 1100 may be applied to a terminal device, and the communication device 1100 may be used to execute the steps in the process shown in FIG. 5 above, where the terminal device is the main execution body, for example, the receiver 1104, Configured to receive downlink control information from a network device, where the downlink control information is used to schedule the terminal device to send an uplink data packet; and the processor 1101 is configured to determine transmission according to a search space or a scrambling code of the downlink control information The scheme of the uplink data packet, the scheme of sending the uplink data packet includes a first scheme of sending the uplink data packet multiple times and a second scheme of sending the uplink data packet only once, the scrambling code A codeword sequence for scrambling the downlink control information; a transmitter 1105 is configured to send the uplink data packet to the network device according to the determined sending scheme.

For another example, in an example of the present application, the device may be used for a network device, and the communication device 1100 may be used to execute the steps in the process shown in FIG. 5 above, where the network device is the main execution body, for example, the processor 1101, In generating downlink control information, the downlink control information is used to schedule a terminal device to send an uplink data packet; a transmitter 1105 is used to send the downlink control information to the terminal device; The scrambling code of the search space or the downlink control information is used to indicate a scheme for the terminal device to send the uplink data packet, and the scheme for the terminal device to send the uplink data packet includes sending the uplink data packet multiple times. In the first scheme and the second scheme in which the uplink data packet is sent only once, the scrambling code is a codeword sequence for scrambling the downlink control information.

As another example, in an example of the present application, the communication device 1100 may be applied to a terminal device, and the communication device 1100 may be used to perform the steps in the process shown in FIG. 6 above, where the terminal device is the main execution body, such as a receiver 1104, configured to receive downlink control information from a network device, where the downlink control information is used to schedule the terminal device to receive a downlink data packet; and a processor 1101, configured to search space or a scrambling code according to the downlink control information, Determining a scheme for receiving the downlink data packet, the scheme for receiving the downlink data packet includes a first scheme for receiving the downlink data packet multiple times and a second scheme for receiving the downlink data packet only once, the plus The scrambling code is a codeword sequence for scrambling the downlink control information; the receiver 1104 is further configured to receive a downlink data packet from the network device according to the determined receiving scheme.

For another example, in an example of the present application, the communication device 1100 may be applied to a network device, and the communication device 1100 is configured to execute the steps in the process shown in FIG. 6 that use the network device as an execution subject, for example, processing A transmitter 1101 is configured to generate downlink control information, and the downlink control information is used to schedule a terminal device to receive a downlink data packet; a transmitter 1105 is configured to send the downlink control information to the terminal device; and used to send the downlink control information The search space of the downlink control information or the scrambling code of the downlink control information is used to instruct the terminal device to receive a downlink data packet solution. The terminal device receives a downlink data packet solution including receiving the downlink data packet multiple times. The first scheme and the second scheme that receives the downlink data packet only once, the scrambling code is a codeword sequence that scrambles the downlink control information; the transmitter 1105 is further configured to receive the downlink data packet according to the indicated receiving scheme. Sending the downlink data packet to the terminal device.

As another example, in an example of the present application, the communication device 1100 may be applied to a terminal device, and the communication device 1100 may be used to execute steps in the process shown in FIG. For example, the receiver 1104 is configured to receive downlink control information from a network device, and the downlink control information is used to schedule the terminal device to retransmit an uplink data packet; and the processor 1101 is configured to be based on a redundancy in the downlink control information. The remaining version indication field determines the number of retransmissions of the uplink data packet; the transmitter 1105 is configured to send the uplink data packet to the network device according to the determined number of retransmissions.

As another example, in an example of the present application, the communication device 1100 may be applied to a network device, and the communication device 1100 may be used to execute the steps shown in FIG. 7a and FIG. 7b with the network device as an execution subject. For example, the processor 1101 is configured to generate downlink control information; the transmitter 1105 is configured to send the downlink control information to a terminal device, and the downlink control information is used to schedule the terminal device to retransmit uplink data packets, and the downlink The redundant version indication field in the control information is used to indicate the number of retransmissions of uplink data packets.

For another example, in an example of the present application, the communication device 1100 may be applied to a terminal device, and the communication device 1100 may be used to execute the steps shown in FIG. 8a and FIG. 8b with the terminal device as an execution main body. For example, the receiver 1104 is configured to receive downlink control information from a network device, and the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet; the processor 1101 is configured to receive the downlink control information according to the downlink control information. The redundant version indication field determines the number of times that the terminal device receives the retransmitted downlink data packet, and the receiver 1104 receives the downlink data from the network device according to the determined number of retransmissions. package.

As another example, in an example of the present application, the communication device 1100 may be applied to a network device, and the communication device 1100 may be used to execute steps in the process shown in FIG. For example, the processor 1101 is configured to generate downlink control information; the transmitter 1105 may be configured to send the downlink control information to a terminal device, and the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet, so that The redundant version indication field in the downlink control information is used to indicate the number of times that the terminal device receives and retransmits downlink data packets; the sender 1105 is further configured to send the terminal device to the terminal device according to the indicated number of retransmissions. Downstream packets.

For the introduction of the processor 1101, the transmitter 1105, and the receiver 1104, reference may be made to the specific descriptions shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, and FIG. 8b, and details are not described herein again.

Based on the above concept, as shown in FIG. 12, the present application also provides a schematic structural diagram of a network device, such as a base station. The base station may be applied to the scenario of the communication system shown in FIG. 1, and the base station may be the network device shown in FIG. 5, FIG. 6, FIG. 7 a, FIG. 8 a, and FIG. 8 b. The base station may be configured to execute the steps shown in FIG. 5, FIG. 6, FIG. 7 a, FIG. 7 b, FIG. 8 a, and FIG. Specifically, the base station 1200 may include one or more radio frequency units, such as a remote radio unit (RRU) 1201 and one or more baseband units (BBU) (also referred to as a digital unit, digital unit). , DU) 1202. The RRU 1201 may be a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 12011 and a radio frequency unit 12012. The RRU1201 part can be used for receiving and transmitting radio frequency signals and converting radio frequency signals to baseband signals, for example, for sending downlink control information to a terminal device. The BBU1202 part can be used for baseband processing and control of base stations. The RRU1201 and the BBU1202 may be physically located together or physically separated, that is, a distributed base station.

The BBU1202 is the control center of the base station and can also be called a processing unit, which is used to complete baseband processing power, such as channel coding, multiplexing, modulation, and spread spectrum waiting. For example, the BBU (processing unit) may be used to control the base station to execute the method in the process shown in FIG. 5, FIG. 6, FIG. 7a, FIG. 7b, FIG. 8a, or FIG. 8b.

In one example, the BBU1202 may be composed of one or more boards, and multiple boards may jointly support a single access system wireless access network (such as an NR network), or may separately support wireless access networks of different access systems. Go online. The BBU 1202 may further include a memory 12021 and a processor 12022. The memory 12021 is used to store necessary instructions and data. For example, the memory 12021 stores the instruction of “instructing the terminal device to send an uplink data packet or receive a downlink data packet according to a search space or a scrambling code” in the foregoing embodiment, and the processor 12022 is configured to control a base station to perform a necessary action. The memory 12021 and the processor 12022 are used to serve one or more single boards. That is, a memory and a processor may be separately set on each board, or multiple boards may share the same memory and processor. In addition, the necessary circuits can be set on each board.

Similar to the above concept, FIG. 13 provides a schematic structural diagram of a terminal device. The terminal device is applicable to the processes shown in FIG. 5, FIG. 7, FIG. 7a, FIG. 7b, FIG. 8a, or FIG. 8b. Steps of executing the main body. For convenience of explanation, FIG. 13 shows only the main components of the terminal device. As shown in FIG. 13, the terminal device 1300 may include a processor, a processor, a memory, and a control circuit. Optionally, the terminal device 1300 may further include an antenna and / or an input / output device. The processor may be used for processing communication protocols and communication data, and controlling user equipment, executing software programs, and processing data of the software programs. The memory may store software programs and / or data. The control circuit can be used for converting baseband signals to radio frequency signals and processing radio frequency signals. The control circuit and the antenna can also be called a transceiver, which can be used to send and receive radio frequency signals in the form of electromagnetic waves. Input-output devices, such as touch screens, display screens, keyboards, etc., can be used to receive data input by the user and output data to the user.

In the embodiment of the present application, the processor may read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When the data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. After the radio frequency circuit processes the baseband signal, the radio frequency signal is sent out as an electromagnetic wave through the antenna. When data is sent to the user equipment, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

Those skilled in the art can understand that, for ease of description, FIG. 11 shows only one memory and a processor. In an actual user equipment, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, which is not limited in the embodiment of the present application.

As an optional implementation manner, the processor may include a baseband processor and a central processor. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control the entire user equipment and execute software programs. Processing data from software programs. The processor in FIG. 13 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit may also be independent processors, which are interconnected through technologies such as a bus. Those skilled in the art can understand that the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing communication protocols and communication data may be built in the processor or stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

Exemplarily, in the embodiment of the present application, the antenna and the control circuit having a transmitting and receiving function may be used as the transmitting and receiving unit 1301 of the terminal device 1300, and the processor having the processing function may be regarded as the processing unit 1302 of the terminal device 1300. As shown in FIG. 13, the terminal device 1300 may include a transceiver unit 1301 and a processing unit 1302. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, and the like. Optionally, the device for implementing the receiving function in the transceiver unit 1301 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit 1301 may be regarded as a transmitting unit, that is, the transceiver unit 1301 includes a receiving unit and a transmitting unit. Exemplarily, the receiving unit may also be called a receiver, a receiver, a receiving circuit, and the like, and the sending unit may also be called a transmitter, a transmitter, or a transmitting circuit.

It should be understood that the network device in each of the foregoing device embodiments corresponds exactly to the network device or terminal device in the terminal device and method embodiments, and the corresponding module or unit performs the corresponding steps, such as the sending module (transmitter) method execution method implementation For the steps sent in the example, the receiving module (receiver) executes the steps received in the method embodiment. Other steps than sending and receiving can be performed by the processing module (processor). For the function of the specific module, refer to the corresponding method embodiment. The sending module and the receiving module can form a transceiver module, and the transmitter and the receiver can form a transceiver to realize the transmitting and receiving function together; the processor can be one or more.

According to the method provided in the embodiment of the present application, an embodiment of the present invention further provides a communication system, which includes the foregoing network device and terminal device.

Based on the above embodiments, an embodiment of the present application further provides a computer storage medium. A software program is stored in the storage medium, and the software program can implement any one or more of the foregoing when read and executed by one or more processors. The method provided by the embodiment. The computer storage medium may include various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

Based on the above embodiments, an embodiment of the present application further provides a chip that includes a processor, and is configured to implement a function involved in any one or more of the foregoing embodiments, such as obtaining or processing information involved in the foregoing method, or Message. Optionally, the chip further includes a memory, which is used to execute necessary program instructions and data executed by the processor. The chip may be composed of a chip, or may include a chip and other discrete devices.

It should be understood that, in the embodiment of the present invention, the processor may be a central processing unit (Central Processing Unit), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and special-purpose integrations. Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory may include read-only memory and random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory.

In addition to the data bus, the bus system may also include a power bus, a control bus, and a status signal bus. However, for the sake of clarity, various buses are marked as a bus system in the figure. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method disclosed in combination with the embodiments of the present invention may be directly implemented by a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the foregoing method in combination with its hardware. To avoid repetition, it will not be described in detail here.

Claims

A communication method, comprising:

The terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to send an uplink data packet;

Determining, by the terminal device, a scheme for sending the uplink data packet according to a search space or a scrambling code of the downlink control information, and the scheme for sending the uplink data packet is a first scheme for sending the uplink data packet multiple times. A scheme or a second scheme that sends the uplink data packet only once, the scrambling code is a codeword sequence that scrambles the downlink control information;

The terminal device sends the uplink data packet to the network device according to the determined sending scheme.
The method according to claim 1, wherein the determining, by the terminal device, a scheme for sending the uplink data packet according to a search space of the downlink control information comprises:

If the search space is a first search space, determining a scheme for sending the uplink data packet as a first scheme;

Alternatively, if the search space is a second search space, it is determined that a scheme for sending the uplink data packet is a second scheme, and the first search space is different from the second search space.
The method according to claim 1, wherein the determining, by the terminal device, a scheme for sending the uplink data packet according to the scrambling code of the downlink control information comprises:

If the scrambling code is a first scrambling code, determining a scheme for sending the uplink data packet as a first scheme;

Alternatively, if the scrambling code is a second scrambling code, it is determined that a scheme for sending the uplink data packet is a second scheme, and the first scrambling code is different from the second scrambling code.
The method according to any one of claims 1 to 3, wherein the downlink control information is specifically used to schedule the terminal device to retransmit the uplink data packet, and the method further comprises:

Determining, by the terminal device, the number of retransmissions of the uplink data packet according to a redundancy version indication field in the downlink control information.
The method according to claim 4, wherein the determining, by the terminal device, the number of retransmissions of the uplink data packet according to a redundant version indication field in the downlink control information comprises:

Determining the number of retransmissions of the uplink data packet according to the adjustment factor indicated by the redundant version indication field and a pre-configured number of retransmissions.
A communication method, comprising:

The network device generates downlink control information, where the downlink control information is used to schedule a terminal device to send an uplink data packet;

Sending, by the network device, the downlink control information to the terminal device;

The search space for sending the downlink control information or the scrambling code for the downlink control information is used to instruct the terminal device to send the uplink data packet, and the terminal device sends the uplink data packet. The solution is a first solution that sends the uplink data packet multiple times or a second solution that sends the uplink data packet only once, and the scrambling code is a codeword sequence that is scrambled by the downlink control information.
The method according to claim 6, wherein a search space for sending the downlink control information is a first search space, and the first search space is used to instruct the terminal device to send the uplink data packet. The plan is the first plan.
The method according to claim 6, wherein a search space for sending the downlink control information is a second search space, and the second search space is used to instruct the terminal device to send the uplink data packet. The plan is the second plan.
The method according to claim 6, wherein the scrambling code of the downlink control information is a first scrambling code, and the first scrambling code is used to instruct the terminal device to send the uplink data packet. The plan is the first plan.
The method according to claim 6, wherein the scrambling code of the downlink control information is a second scrambling code, and the second scrambling code is used to instruct the terminal device to send the uplink data packet. The plan is the second plan.
The method according to any one of claims 5, 6, and 8, wherein the downlink control information is specifically used to schedule the terminal device to retransmit the uplink data packet, wherein the downlink control information includes The redundant version indication field is used to determine the number of retransmission times of the uplink data packet.
The method according to claim 11, wherein the redundant version indication field in the downlink control information is used to indicate an adjustment factor, and the adjustment factor is used to adjust a pre-configured number of retransmissions.
A communication method, comprising:

The terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to receive a downlink data packet;

Determining, by the terminal device, a scheme for receiving the downlink data packet according to a search space or a scrambling code of the downlink control information, and the scheme for receiving the downlink data packet is a first time that the downlink data packet is received multiple times A scheme or a second scheme that receives the downlink data packet only once, the scrambling code is a codeword sequence that scrambles the downlink control information;

The terminal device receives a downlink data packet from the network device according to the determined receiving scheme.
The method according to claim 13, wherein the determining, by the terminal device, a scheme for receiving the downlink data packet according to a search space of the downlink control information comprises:

If the search space is a first search space, determining a scheme for receiving the downlink data packet as a first scheme;

Alternatively, if the search space is a second search space, it is determined that a scheme for receiving the downlink data packet is a second scheme, and the first search space is different from the second search space.
The method according to claim 13, wherein the determining, by the terminal device, a scheme for receiving the downlink data packet according to the scrambling code of the downlink control information, comprises:

If the scrambling code is a first scrambling code, determining a scheme for receiving the downlink data packet as a first scheme;

Alternatively, if the scrambling code is a second scrambling code, it is determined that a scheme for receiving the downlink data packet is a second scheme, and the first scrambling code is different from the second scrambling code.
The method according to any one of claims 12 to 15, wherein the downlink control information is specifically used to schedule the terminal device to receive the downlink data packet for retransmission, and the method further comprises:

The terminal device determines the number of retransmissions of the downlink data packet according to the downlink control information.
The method according to claim 16, wherein the terminal device determines the number of retransmissions of the downlink data packet according to the downlink control information:

Determining the number of retransmissions of the downlink data packet according to the adjustment factor indicated by the redundant version indication field in the downlink control information and a pre-configured number of retransmissions.
A communication method, comprising:

The network device generates downlink control information, where the downlink control information is used to schedule a terminal device to receive a downlink data packet;

Sending, by the network device, the downlink control information to the terminal device;

The search space for sending the downlink control information or the scrambling code for the downlink control information is used to instruct the network device to send the downlink data packet, and the network device sends the downlink data packet to the network. The scheme includes a first scheme for sending the downlink data packet multiple times or a second scheme for sending the downlink data packet only once, and the scrambling code is a codeword sequence for scrambling the downlink control information;

The network device sends the downlink data packet to the terminal device according to the indicated sending scheme.
The method according to claim 18, wherein a search space for sending the downlink control information is a first search space, and the first search space is used to indicate that a scheme for sending the downlink data packet is a first Program.
The method according to claim 18, wherein a search space for sending the downlink control information is a second search space, and the second search space is used to indicate that a scheme for sending the downlink data packet is a second Program.
The method according to claim 18, wherein the scrambling code of the downlink control information is a first scrambling code, and the first scrambling code is used to indicate that a scheme for sending the downlink data packet is a first Program.
The method according to claim 18, wherein the scrambling code of the downlink control information is a second scrambling code, and the second scrambling code is used to indicate that a scheme for sending the downlink data packet is a second Program.
The method according to any one of claims 18, 19, and 21, wherein the downlink control information is specifically used to schedule the terminal device to receive the downlink data packet that is retransmitted, wherein the downlink control information The redundant version indication field in is used to determine the number of retransmission times of the downlink data packet.
The method according to claim 23, wherein the redundant version indication field is used to indicate an adjustment factor, and the adjustment factor is used to adjust a pre-configured number of retransmissions to determine the downlink data packet. Number of retransmissions.
A communication method, comprising:

The terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to retransmit an uplink data packet;

Determining, by the terminal device, the number of times to retransmit the uplink data packet according to a redundant version indication field in the downlink control information;

The terminal device retransmits the uplink data packet to the network device according to the determined number of retransmissions.
The method according to claim 4 or 25, wherein the determining, by the terminal device, the number of times to retransmit the uplink data packet according to a redundant version indication field in the downlink control information, comprises:

The terminal device determines a target retransmission times from a preset set of retransmission times according to a value indicated by the redundancy version indication field, and the target retransmission times is the number of times to retransmit the uplink data packet.
A communication method, comprising:

Network equipment generates downlink control information;

The network device sends the downlink control information to a terminal device, the downlink control information is used to schedule the terminal device to retransmit an uplink data packet, and a redundancy version indication field in the downlink control information is used to indicate the uplink Number of packet retransmissions.
The method according to claim 11 or 27, wherein the value indicated by the redundant version indication field indicates a sequence number of the target retransmission times in a preset retransmission times set, and the target retransmission times is The number of retransmissions of the uplink data packet.
A communication method, comprising:

The terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet;

Determining, by the terminal device, the number of times to receive a retransmitted downlink data packet according to a redundant version indication field in the downlink control information;

The terminal device receives a downlink data packet from the network device according to the determined number of retransmissions.
The method according to claim 16 or 29, wherein the determining, by the terminal device according to a redundancy version indication field in the downlink control information, the number of times to receive a retransmitted downlink data packet comprises:

The terminal device determines a target retransmission number from a preset set of retransmission times according to a value indicated by the redundancy version indication field, and the target retransmission number is the number of times that a downlink data packet is received for retransmission.
A communication method, comprising:

Network equipment generates downlink control information;

The network device sends the downlink control information to a terminal device, where the downlink control information is used to schedule the terminal device to receive a retransmitted downlink data packet, and a redundant version indication field in the downlink control information is used to indicate a retransmission. The number of times a downlink data packet was transmitted;

Sending, by the network device, the downlink data packet to the terminal device according to the indicated number of retransmissions.
The method according to claim 23 or 31, wherein the value indicated by the redundant version indication field indicates a sequence number of the target retransmission times in a preset set of retransmission times, and the target retransmission times is Number of times a downlink packet was received and retransmitted.
A communication method, comprising:

The terminal device receives downlink control information from a network device, and the downlink control information is used to schedule the terminal device to retransmit an uplink data packet, wherein the downlink control information does not carry a redundant version field;

Determining, by the terminal device, the number of times to retransmit the uplink data packet according to a repetition number field in the downlink control information;

The terminal device retransmits the uplink data packet to the network device according to the determined number of retransmissions.
A communication method, comprising:

The network device generates downlink control information, where the downlink control information carries a repetition number field and does not carry a redundant version field;

The network device sends the downlink control information to a terminal device, the downlink control information is used to schedule the terminal device to retransmit an uplink data packet, and a redundancy version indication field in the downlink control information is used to indicate the uplink Number of packet retransmissions.
A communication device, comprising a processor and a memory;

The memory is configured to store a computer execution instruction;

The processor is configured to execute a computer execution instruction stored in the memory, so that the communication device implements a function of the following device in the method according to any one of claims 1 to 34: the network device, or, Mentioned terminal equipment.
A computer-readable storage medium, wherein the storage medium stores computer instructions, and when the computer instructions are executed by a computer, the computer causes the computer to execute the method according to any one of claims 1 to 34. .
A computer program product, wherein the computer program product includes computer instructions, and when the computer instructions are executed by a computer, the computer causes the computer to execute the method according to any one of claims 1 to 34.