Data transmission method and device

Abstract

A data transmission method and apparatus, wherein the method comprises: a terminal device sends a message 1 to a first network device, the message 1 includes a random access preamble; the terminal device receives a DCI from the first network device and a message 2 scheduled by the DCI; the message 2 includes downlink data, the DCI and / or the message 2 include first information, the first information is used to schedule ACK / NACK feedback information of the message 2; the terminal device sends the ACK / NACK feedback information to the first network device according to the first information. Through the above method, the first information is used to schedule ACK / NACK feedback information, so the terminal device can send the ACK / NACK feedback information of the message 2 to the first network device in the MT‑EDT scenario according to the first information included in the DCI and / or the message 2, which can improve the robustness of downlink data transmission in the message 2.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a data transmission method and device. Background Art

[0002] In communication systems such as the Long Term Evolution (LTE) system, in order to transmit data between a terminal device and a base station, a radio resource control (RRC) connection must be established through a random access (RA) process. After the RRC connection is established, data can be transmitted between the terminal device and the base station.

[0003] The machine type communication (MTC) system or narrow band internet of things (NB-IoT) system currently under discussion is different from the traditional LTE system. Its data transmission is characterized by a small amount of data and uncertain data arrival time. In the 5th generation (5G) mobile communication standard that has been formulated, the mobile originated early data transmission (MO-EDT) technology is proposed based on the random access process. The MO-EDT technology is mainly a technology for uplink data transmission. If the amount of data that the terminal device needs to send is small and can be transmitted in one transmission block (TB), the terminal device can trigger the MO-EDT process and transmit the uplink data through message 3 in the MO-EDT process. In the MO-EDT process, the base station can send downlink data to the terminal device through message 4 in the MO-EDT process. After the MO-EDT process ends, the terminal device will release the connection with the base station and remain idle. It can be seen from the above process that the MO-EDT process is only for the scenario of uplink data transmission. Although the base station can also transmit downlink data in message 4, it can only be used for the scenario where the current base station has downlink data to be sent. It does not support the scenario where the base station actively sends downlink data.

[0004] To this end, in view of the uncertainty of the arrival time of downlink data in MTC systems or NB-IoT systems, a downlink data transmission scheme based on a random access process, namely mobile terminated early data transmission (MT-EDT) technology, is currently being discussed. When the base station and core network equipment need to transmit downlink data, the MT-EDT process can be actively triggered, and the downlink data can be sent through message 2 in the MT-EDT process. However, in this scheme, after the terminal device receives the downlink data through message 2, how to send feedback information of message 2 including the downlink data to the base station has not yet had a clear solution, which is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a data transmission method and apparatus to solve the problem of how a terminal device sends feedback information of message 2 during the MT-EDT process.

[0006] In a first aspect, an embodiment of the present application provides a data transmission method, including: a terminal device sends a message 1 to a first network device, wherein the message 1 includes a random access preamble code; the terminal device receives downlink control information DCI from the first network device and a message 2 scheduled by the DCI; the message 2 includes downlink data, and the DCI and / or the message 2 include first information, and the first information is used to schedule confirmation ACK / negative confirmation NACK feedback information of the message 2; the terminal device sends the ACK / NACK feedback information to the first network device according to the first information.

[0007] Through the above method, the first information is used to schedule ACK / NACK feedback information. Therefore, the terminal device can send ACK / NACK feedback information of message 2 to the first network device in the MT-EDT scenario according to the first information included in the DCI and / or message 2, which can improve the robustness of the downlink data transmission in message 2.

[0008] In one possible design, the terminal device sends the ACK / NACK feedback information to the first network device according to the first information, including: the terminal device determines the time-frequency resources, subcarrier spacing, and number of repetitions of the ACK / NACK feedback information; the terminal device sends the ACK / NACK feedback information according to the time-frequency resources, subcarrier spacing, and number of repetitions; wherein the DCI or the message 2 includes the first information, and the first information includes one or more of the following:

[0009] First indication information, where the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; and second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0010] In the above method, by indicating the subcarrier spacing of the subcarriers transmitting the ACK / NACK feedback information and the number of repetitions through DCI or the message 2, flexible scheduling of the ACK / NACK feedback information can be achieved.

[0011] In one possible design, the DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated or set by a system message; or, when the first information only includes the second indication information, the subcarrier spacing of the subcarrier transmitting the ACK / NACK feedback information is indicated or set by a system message.

[0012] In the above method, when the first information includes only part of the scheduling information, the other part may be indicated or set by the system message, thereby reducing the overhead of the first information and improving resource utilization.

[0013] In one possible design, when the DCI includes the first information, the DCI includes at least one of a first field for transmitting first indication information and a second field for transmitting second indication information; the first indication information is a state value of a bit included in the first field, and the second indication information is a state value of a bit included in the second field;

[0014] Different state values ​​of the bits included in the first field are used to indicate different subcarrier spacings;

[0015] Different state values ​​of the bits included in the second field are used to indicate different numbers of repetitions.

[0016] In one possible design, when the message 2 includes the first information, the first information also includes one or more of the following:

[0017] third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information;

[0018] fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information;

[0019] fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information;

[0020] Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information;

[0021] Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

[0022] In the above method, more indication information can be carried by message 2, the scheduling granularity can be finer, and the scheduling is more flexible.

[0023] In one possible design, the DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0024] In the above method, the first information can be carried together by DCI and the message 2, which can improve resource utilization.

[0025] In one possible design, before the terminal device sends message 1 to the first network device, the method also includes: the terminal device receives a first paging message from the first network device, the first paging message includes resource indication information, the resource indication information is used to indicate the random access channel RACH resources allocated to the terminal device, and the RACH resources are used to carry the message 1; the RACH resources are allocated based on second information, and the second information includes capability information of the terminal device and related to paging.

[0026] In the above method, RACH resources are allocated according to the second information, so that RACH resources matching the capabilities of the terminal device can be allocated to the terminal device, thereby improving resource utilization efficiency.

[0027] In one possible design, the second information includes one or more of the following:

[0028] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0029] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0030] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

[0031] In one possible design, before the terminal device receives the first paging message from the first network device, the method also includes: the terminal device sends the second information to the first network device.

[0032] In a second aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the first aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0033] In a possible implementation, the communication device includes: a processor configured to support the communication device to perform the corresponding functions of the terminal device in the communication method shown above. The communication device may also include a memory, which may be coupled to the processor and stores necessary program instructions and data for the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and the first network device, etc.

[0034] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0035] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0036] In the third aspect, the present application also provides a data transmission method, including: a first network device receives a message 1 from a terminal device, and the message 1 includes a random access preamble code; the first network device sends downlink control information DCI and a message 2 scheduled by the DCI to the terminal device; the DCI and / or the message 2 include first information, and the first information is used to schedule confirmation ACK / negative confirmation NACK feedback information of the message 2; the first network device receives the ACK / NACK feedback information from the terminal device.

[0037] Through the above method, the first information is used to schedule ACK / NACK feedback information. Therefore, the terminal device can send ACK / NACK feedback information of message 2 to the first network device in the MT-EDT scenario according to the first information included in the DCI and / or message 2, which can improve the robustness of the downlink data transmission in message 2.

[0038] In one possible design, the DCI or the message 2 includes the first information, and the first information includes one or more of the following: first indication information, the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; second indication information, the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0039] In one possible design, when the DCI includes the first information, the DCI includes at least one of a first field for transmitting first indication information and a second field for transmitting second indication information; the first indication information is a state value of a bit included in the first field, and the second indication information is a state value of a bit included in the second field;

[0040] Different state values ​​of the bits included in the first field are used to indicate different subcarrier spacings;

[0041] Different state values ​​of the bits included in the second field are used to indicate different numbers of repetitions.

[0042] In one possible design, when the message 2 includes the first information, the first information also includes one or more of the following:

[0043] third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information;

[0044] fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information;

[0045] fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information;

[0046] Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information;

[0047] Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

[0048] In one possible design, the DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated or set by a system message; or, when the first information only includes the second indication information, the subcarrier spacing of the subcarrier transmitting the ACK / NACK feedback information is indicated or set by a system message.

[0049] In one possible design, the DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0050] In one possible design, before the first network device receives message 1 from the terminal device, the method also includes: the first network device receives a second paging message from a second network device, the second paging message includes second information, the second information includes capability information of the terminal device and related to paging; the first network device allocates a random access channel RACH resource to the terminal device according to the second information, and determines a first paging message to be sent to the terminal device according to the second paging message, the first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource; the first network device sends the first paging message to the terminal device.

[0051] In one possible design, the second information includes one or more of the following:

[0052] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0053] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0054] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

[0055] In one possible design, before the first network device receives the second paging message from the second network device, the method also includes: the first network device receives the second information from the terminal device and sends the second information to the second network device.

[0056] In a fourth aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the third aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0057] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding function of the first network device in the communication method shown above. The communication device may also include a memory, which may be coupled to the processor and stores necessary program instructions and data for the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a terminal device, etc.

[0058] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0059] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0060] In a fifth aspect, the present application also provides a data transmission method, comprising: a first network device receives a second paging message from a second network device, the second paging message includes second information, the second information includes capability information of the terminal device and related to paging; the first network device allocates a random access channel RACH resource to the terminal device according to the second information, and determines a first paging message to be sent to the terminal device according to the second paging message, the first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource; the first network device sends the first paging message to the terminal device.

[0061] In the above method, RACH resources are allocated according to the second information, so that RACH resources matching the capabilities of the terminal device can be allocated to the terminal device, thereby improving resource utilization efficiency.

[0062] In one possible design, the second information includes one or more of the following:

[0063] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0064] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0065] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for user plane CIoT EPS optimization.

[0066] In one possible design, before the first network device receives the second paging message from the second network device, the method also includes: the first network device receives the second information from the terminal device and sends the second information to the second network device.

[0067] In a sixth aspect, the present application also provides a data transmission method, comprising: a terminal device receives a first paging message from a first network device, the first paging message includes resource indication information, the resource indication information is used to indicate a random access channel RACH resource, the RACH resource is allocated based on second information, and the second information includes capability information required for paging of the terminal device; the terminal device sends a random access preamble code to the first network device based on the RACH resource.

[0068] In the above method, RACH resources are allocated according to the second information, so that RACH resources matching the capabilities of the terminal device can be allocated to the terminal device, thereby improving resource utilization efficiency.

[0069] In one possible design, the second information includes one or more of the following: first capability information, used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0070] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0071] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for user plane CIoT EPS optimization.

[0072] In one possible design, before the terminal device receives the first paging message from the first network device, the method also includes: the terminal device sends the second information to the first network device.

[0073] In the seventh aspect, the present application also provides a data transmission method, including: a terminal device receives downlink control information DCI from a first network device and a downlink message scheduled by the DCI; the DCI or the downlink message includes second indication information, and the second indication information is used to determine the number of repetitions of ACK / NACK feedback information; the terminal device sends the ACK / NACK feedback information to the first network device according to the number of repetitions.

[0074] In the above method, flexible scheduling of ACK / NACK feedback information can be achieved by carrying the number of repetitions of ACK / NACK feedback information in DCI or the downlink message.

[0075] In an eighth aspect, the present application also provides a data transmission method, comprising: a first network device sends downlink control information DCI and a downlink message scheduled by the DCI to a terminal device; the DCI or the downlink message includes second indication information, and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information; the first network device receives the ACK / NACK feedback information from the terminal device.

[0076] In a ninth aspect, the present application further provides a communication device, which has the function of implementing any method provided in any one of the fifth to eighth aspects. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0077] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of any of the above methods. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a terminal device or a first network device, etc.

[0078] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0079] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0080] In the tenth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-readable instructions are stored. When a computer reads and executes the computer-readable instructions, the computer executes the method in any one of the possible designs described above.

[0081] In the eleventh aspect, an embodiment of the present application provides a chip, which is connected to a memory and is used to read and execute a software program stored in the memory to implement a method in any possible design mentioned above.

[0082] In a twelfth aspect, an embodiment of the present application provides a chip system, which includes a processor and may also include a memory, for implementing the method in any of the above possible designs. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0083] In the thirteenth aspect, an embodiment of the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes the method in any possible design described above.

[0084] On the fourteenth aspect, an embodiment of the present application provides a system, which includes the terminal device provided in the second aspect and the first network device provided in the fourth aspect.

[0085] On the fourteenth aspect, an embodiment of the present application provides a system, which includes the first device in the third aspect and the second device in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 A schematic diagram of a communication system applicable to the method of an embodiment of the present application;

[0087] Figure 2 It is a schematic diagram of the random access process flow in the prior art;

[0088] Figure 3 A schematic diagram of a data transmission method flow chart provided in an embodiment of the present application;

[0089] Figure 4 A schematic diagram of a data transmission method flow chart provided in an embodiment of the present application;

[0090] Figure 5 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0091] Figure 6 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0093] The embodiments of the present application can be applied to wireless communication systems, and in particular to mobile communication systems supporting NB-IoT or eMTC, such as new radio (NR) systems, long term evolution (LTE) systems, advanced long term evolution (LTE-A) systems, evolved long term evolution (evolved long term evolution, eLTE) systems, future communication systems and other communication systems, without limitation herein.

[0094] In the embodiments of the present application, the terminal device may be a device with wireless transceiver function or a chip that can be set in any device, and may also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc.

[0095] The access network equipment can be an evolutionary node B (eNB) in the LTE system, a base transceiver station (BTS) in the global system of mobile communication (GSM) system or code division multiple access (CDMA), or a base station (nodeB, NB) in the wideband code division multiple access (WCDMA) system, etc.

[0096] To facilitate understanding of the embodiments of the present application, first Figure 1 The communication system shown in the figure is used as an example to describe in detail the communication system applicable to the embodiments of the present application. Figure 1 A schematic diagram of a communication system applicable to the method of an embodiment of the present application is shown. Figure 1 As shown, the access network device and terminal devices 1 to 5 form a communication system, in which the access network device sends information to one or more terminal devices among terminal devices 1 to 5. In addition, terminal devices 4 to 5 also form a communication system.

[0097] Figure 1 In the system shown, the access network device can use the MT-EDT process to send downlink data to the terminal device, thereby improving data transmission efficiency. MT-EDT is a downlink data transmission scheme proposed based on the traditional random access process. The traditional random access process generally includes the following steps:

[0098] Step 1: The terminal device sends a random access preamble to the access network device to initiate a random access process. The random access preamble is also called message 1 (msg 1).

[0099] Step 2: The access network device sends a random access response (RAR) to the terminal device. The RAR is also called message 2 (msg 2) of the random access process.

[0100] Specifically, if the access network device successfully detects the random access preamble sent by the terminal device, it sends a random access response corresponding to the random access preamble. The RAR may include information such as uplink grant (UL grant), and the uplink grant may be used to schedule message 3.

[0101] Step 3: The terminal device sends message 3 to the access network device according to the uplink authorization in the RAR.

[0102] Specifically, if the terminal device successfully receives the RAR in the RAR monitoring window, it transmits EDT message 3 (message 3, msg 3) on the resources specified by the uplink grant in the RAR.

[0103] Step 4: The access network device sends a contention resolution message to the terminal device. This message may also be referred to as message 4 (msg 4).

[0104] Through the above process, the terminal device enters the connected state, so that data can be transmitted between the access network device. However, the above process is time-consuming and involves a lot of signaling interactions, which will increase the time delay of the terminal device and the energy consumption of the terminal device.

[0105] To this end, in view of the characteristics of the MTC system or NB-IoT system that the arrival time of downlink data is uncertain and the amount of downlink data is small, when the access network device needs to transmit downlink data, the downlink data can be sent through message 2 in the MT-EDT process. Specifically, Figure 2 As shown, the MT-EDT process currently discussed may have the following steps:

[0106] Step 201: The access network device sends a paging message to the terminal device.

[0107] The paging message includes information such as a radio network temporary identity (RNTI).

[0108] Step 202: The terminal device sends a message 1 to the access network device, where the message 1 includes a random access preamble code.

[0109] Step 203: The access network device sends downlink control information (DCI) encrypted with the RNTI to the terminal device.

[0110] The DCI is used to schedule a message 2 to be sent by the access network device.

[0111] Step 203: The access network device sends message 2 to the terminal device, where message 2 includes downlink data.

[0112] In the prior art, message 2 does not include downlink data, but only includes signaling such as uplink grant (UL grant), so the terminal device does not need to send feedback information of message 2. Since message 2 in the MT-EDT process includes downlink data, the terminal device also needs to send feedback information, so that the access network device determines whether the terminal device has received the message data sent through message 2, so the MT-EDT process may also include step 204.

[0113] Step 204: The terminal device sends an acknowledgement (ACK) / negative acknowledgement (NACK) feedback information of message 2 to the access network device.

[0114] Optionally, after the terminal device successfully receives message 2, the terminal device releases the connection with the access network device and remains in an idle state.

[0115] Optionally, after the terminal device successfully receives message 2, if the terminal device has uplink data, the terminal device monitors the DCI sent by the access network device, and sends the uplink data to the access network device after receiving the DCI.

[0116] In the above process, the ACK / NACK feedback information sent by the terminal device needs to be scheduled by the access network device. Since there is no method for scheduling ACK / NACK feedback information in the MT-EDT process in the prior art, an embodiment of the present application provides a method for scheduling how the terminal device sends ACK / NACK feedback information, which will be described in detail below.

[0117] Embodiment 1:

[0118] In the first embodiment, ACK / NACK feedback information may be scheduled through DCI. Specifically, in combination with the above description, Figure 3 The figure is a flow chart of a data transmission method provided in an embodiment of the present application. Figure 3 In the process shown, the first network device may be an access network device, and the second network device may be a core network device. Figure 3 , the method comprising:

[0119] Step 301: A first network device sends a first paging message to a terminal device.

[0120] The first paging message may carry the first RNTI and information such as the non-access stratum (NAS) identifier of the paged terminal device. The NAS identifier may be an identifier such as the System Architecture Evolution Temporary Mobile Station Identifier (S-TMSI).

[0121] The first paging message may also include resource indication information, where the resource indication information is used to indicate a random access channel (RACH) resource and a first radio network temporary identity (RNTI) corresponding to the RACH resource. The first RNTI may be used to scramble the DCI.

[0122] The first paging message may also include downlink data indication information, where the downlink data indication information is used to indicate that downlink data needs to be sent to the terminal device.

[0123] It should be noted that before sending the first paging message, the first network device also receives a second paging message from the second network device, the second paging message is used to instruct the first network device to page the terminal device. The second paging message is sent by the second network device after acquiring the downlink data of the terminal device.

[0124] Step 302: The terminal device receives a first paging message from a first network device.

[0125] If the terminal device determines that the first paging message includes the NAS identifier of the terminal device, and the first paging message includes the first RNTI, the terminal device may send message 1 on the RACH resource, that is, step 303 .

[0126] Step 303: The terminal device sends a message 1 to the first network device, where the message 1 includes a random access preamble code.

[0127] Step 304: The first network device receives message 1 from the terminal device, and sends a DCI to the terminal device.

[0128] The DCI shown may be scrambled using the first RNTI.

[0129] The DCI may be used to schedule message 2. For details on how the DCI schedules message 2, please refer to the description in the prior art and will not be repeated here.

[0130] Furthermore, the DCI may include first information, where the first information is used to schedule ACK / NACK feedback information of the message 2. There may be multiple implementation methods for the first information, which are described below respectively.

[0131] In a first possible implementation manner, the first information includes first indication information but does not include second indication information, and the number of repetitions of the ACK / NACK feedback information indicated by the second indication information is indicated by a system message or is set.

[0132] The first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0133] In this implementation, the DCI may include a first field for transmitting first indication information, where the first indication information is a state value of the bits included in the first field, and different state values ​​of the bits included in the first field are used to indicate different subcarrier spacings.

[0134] For example, the first field includes 1 bit. When the state value of the bit included in the first field is '0', it indicates that the uplink subcarrier spacing is 3.75 kHz; when the state value of the bit included in the first field is '1', it indicates that the uplink subcarrier spacing is 15 kHz.

[0135] In this implementation, the content included in the DCI can be referred to as shown in Table 1.

[0136] Table 1

[0137]

[0138] In Table 1, the format N0 / format N1 distinguishing identification field is used to indicate the specific format of the DCI; the NPDCCH order indication field is used to indicate whether the current DCI scheduling is a random access process triggered by the NPDCCH order; the scheduling delay field is used to determine the start time of the DCI scheduled message transmission; the resource allocation field is used to indicate the resource allocation of the DCI scheduled message, such as the allocation of time domain resources; the modulation and coding strategy field is used to indicate the modulation order of the DCI scheduled message; the repetition number field is used to indicate the number of repetitions used for the transmission of the DCI scheduled message; the new data indication field is used to indicate whether the currently scheduled transmission is a new transmission or a retransmission; the HARQ-ACK resource field is used to indicate the time-frequency resource location for the transmission of ACK / NACK feedback information; the DCI repetition number field is used to indicate the number of repetitions of the DCI.

[0139] When the format of DCI is DCI format N1, the bits occupied by the first field may be the bits occupied by the format N0 / format N1 distinguishing identification field in the original DCI format N1, or the bits occupied by the NPDCCH order indication field. At this time, the DCI only includes one of the format N0 / format N1 distinguishing identification field and the NPDCCH order indication field, as shown in Table 1. Through this method, scheduling is more flexible, and compared with the existing DCI format, the number of DCI bits is not increased, which can ensure DCI demodulation performance and does not increase the complexity of demodulating and decoding DCI of the terminal device.

[0140] When the format of the DCI is a newly defined DCI format, that is, a format other than DCI format N0 and DCI format N1, the DCI may simultaneously include a format N0 / format N1 distinguishing identification field and a NPDCCH order indication field, and also include a first field, that is, a first field is added on the basis of all the fields included in the existing DCI format N1. For details, please refer to Table 2.

[0141] Table 2

[0142]

[0143]

[0144] In a second possible implementation manner, the first information includes the second indication information but does not include the first indication information, and the subcarrier spacing indicated by the first indication information is indicated by a system message or is set.

[0145] In this implementation, the DCI may include a second field for transmitting second indication information, where the second indication information is a state value of the bits included in the second field, and different state values ​​of the bits included in the second field are used to indicate different numbers of repetitions of the ACK / NACK feedback information.

[0146] For example, the second field includes 1 bit. When the state value of the bit included in the second field is '0', it indicates that the ACK / NACK feedback information is repeated 2 times; when the state value of the bit included in the first field is '1', it indicates that the ACK / NACK feedback information is repeated 4 times.

[0147] In this implementation, the DCI may include a second field for transmitting second indication information, and one of the different state values ​​of the bit included in the second field indicates that the number of repetitions of the ACK / NACK feedback information is the same as the number of repetitions of the ACK / NACK feedback information indicated in the system message. For example, the number of repetitions of the ACK / NACK feedback information indicated in the system message is 4, and the second field includes 1 bit. When the state value of the bit included in the second field is '0', it indicates that the number of repetitions of the ACK / NACK feedback information is the same as the number of repetitions of the ACK / NACK feedback information indicated in the system message, that is, the number of repetitions of the ACK / NACK feedback information is 4; when the state value of the bit included in the first field is '1', it indicates that the number of repetitions of the ACK / NACK feedback information is 2.

[0148] In this implementation, when the format of DCI is DCI format N1, the content included in DCI can refer to that shown in Table 3.

[0149] Table 3

[0150] Fields included in DCI Bit width Identification of format N0 or format N1 or NPDCCH order indication 1 Second field 1 Scheduling delay 3 Resource Allocation 3 Modulation and coding strategies 4 Repetitions 4 New data indication 1 HARQ-ACK Resources 4 DCI repetition times 2

[0151] In Table 3, the meanings of the format N0 / format N1 distinction identification field, NPDCCH order indication field, scheduling delay field, resource allocation field, modulation and coding strategy field, repetition number field, new data indication field, HARQ-ACK resource field and DCI repetition number field can all be referred to the previous description and will not be repeated here.

[0152] When the format of DCI is DCI format N1, the bits occupied by the second field can be the bits occupied by the format N0 / format N1 distinguishing identification field in the original DCI format N1, or the bits occupied by the NPDCCH order indication field. At this time, the DCI only includes one of the format N0 / format N1 distinguishing identification field and the NPDCCH order indication field. Through this method, scheduling is more flexible, and compared with the existing DCI format, the number of DCI bits is not increased, which can ensure the DCI demodulation performance, and does not increase the complexity of the terminal device demodulating and decoding the DCI.

[0153] In this implementation, when the format of the DCI is a newly defined DCI format, that is, a format other than DCI format N0 and DCI format N1, the number of bits included in the second field may be greater than or equal to 1, for example, 1 or 2 or 3. In this implementation, the DCI may include both the format N0 / format N1 distinction identification field and the NPDCCH order indication field, or may include one of the fields, for details, refer to Table 4.

[0154] Table 4

[0155] Fields included in DCI Bit width Identifier to distinguish between format N0 and format N1 1 or 0 NPDCCH order instructions 1 or 0 Second field 1 or 2 or 3 Scheduling delay 3 Resource Allocation 3 Modulation and coding strategies 4 Repetitions 4 New data indication 1 HARQ-ACK Resources 4 DCI repetition times 2

[0156] In Table 4, when the bit width of the identification field for distinguishing format N0 or format N1 is 0, it indicates that the field is not included in the DCI; when the bit width of the identification field for distinguishing format N0 or format N1 is 1, it indicates that the field is included in the DCI; correspondingly, when the bit width of the NPDCCHorder indication field is 0, it indicates that the field is not included in the DCI; when the bit width of the NPDCCHorder indication field is 1, it indicates that the field is included in the DCI.

[0157] According to the current power control mechanism of ACK / NACK feedback information, when the number of repetitions of ACK / NACK feedback information is greater than 2, the ACK / NACK feedback information is transmitted at full power. If the initial system message or RRC signaling indicates that the number of repetitions of ACK / NACK feedback information is greater than 2, when the terminal device is close to the first network device, full-power transmission will cause greater uplink interference, affecting the uplink services of other terminal devices, thereby affecting the system uplink throughput.

[0158] If the number of repetitions of ACK / NACK feedback information is indicated by system message or RRC signaling, the terminal device needs to re-acquire the system message or receive RRC reconfiguration information to obtain updated parameters, which will increase the power consumption of the terminal device. In the embodiment of the present application, the number of repetitions of ACK / NACK feedback information is indicated by DCI, which is relatively more flexible and can avoid the uplink interference problem caused by full-power transmission of ACK / NACK feedback information.

[0159] In a third possible implementation manner, the first information includes first indication information and second indication information.

[0160] In this implementation, the DCI may include a first field for transmitting the first indication information and a second field for transmitting the second indication information. The first field and the second field may refer to the previous description and will not be described in detail here.

[0161] For example, in this implementation, when the format of the DCI is DCI format N1, the content included in the DCI can refer to that shown in Table 3.

[0162] Table 5

[0163]

[0164]

[0165] In Table 5, when the bit width of the identification field for distinguishing format N0 or format N1 is 0, it indicates that the field is not included in the DCI; when the bit width of the identification field for distinguishing format N0 or format N1 is 1, it indicates that the field is included in the DCI; correspondingly, when the bit width of the NPDCCHorder indication field is 0, it indicates that the field is not included in the DCI; when the bit width of the NPDCCHorder indication field is 1, it indicates that the field is included in the DCI.

[0166] In this implementation, the DCI can simultaneously indicate the number of repetitions of the ACK / NACK feedback information and the subcarrier spacing of the ACK / NACK feedback information, thereby further improving the flexibility of scheduling.

[0167] Step 305: The first network device sends message 2 to the terminal device.

[0168] The message 2 includes downlink data and may also include signaling sent to the terminal device.

[0169] Step 306: The terminal device receives the DCI from the first network device and the message 2 scheduled by the DCI.

[0170] Step 307: The terminal device sends the ACK / NACK feedback information to the first network device according to the first information.

[0171] Step 308: The first network device receives ACK / NACK feedback information from the terminal device.

[0172] Specifically, the terminal device may determine the time-frequency resources of the ACK / NACK feedback information according to the DCI, and determine at least one of the subcarrier spacing and the number of repetitions of the ACK / NACK feedback information according to the first information; wherein, if only the subcarrier spacing of the ACK / NACK feedback information is determined according to the first information, then the number of repetitions of the ACK / NACK feedback information may be determined by a system message, or the number of repetitions of the ACK / NACK feedback information is preset; if only the number of repetitions of the ACK / NACK feedback information is determined according to the first information, then the subcarrier spacing of the ACK / NACK feedback information may be determined by a system message, or the subcarrier spacing of the ACK / NACK feedback information is preset. The terminal device may send the ACK / NACK feedback information according to the time-frequency resources, subcarrier spacing and number of repetitions.

[0173] It should be noted that, in the embodiment of the present application, the terminal device sends ACK / NACK feedback information of message 2 to the first network device in the following ways:

[0174] Method 1: If the terminal device correctly receives message 2, the ACK / NACK feedback information is ACK, and the terminal device sends ACK to the first network device; if the terminal device does not correctly receive message 2, the ACK / NACK feedback information is NACK, and the terminal device sends NACK to the first network device.

[0175] Method 2: If the terminal device correctly receives message 2, the ACK / NACK feedback information is ACK, and the terminal device sends ACK to the first network device; if the terminal device does not correctly receive message 2, the terminal device does not perform the sending operation, and the terminal device can immediately not send NACK to the first network device.

[0176] Method three: If the terminal device correctly receives message 2, the ACK / NACK feedback information is ACK, and the terminal device does not perform a sending operation, which can be understood as the terminal device not sending ACK to the first network device; if the terminal device does not correctly receive message 2, the ACK / NACK feedback information is NACK, and the terminal device sends NACK to the first network device.

[0177] Optionally, when the terminal device sends ACK / NACK feedback information of message 2 to the first network device, it can send a scheduling request at the same time. The scheduling request is used to request the first network device to allocate uplink channel resources. For example, when there is a scheduling request, the terminal device can determine a complex symbol sequence based on the first sequence and the modulation symbol of the ACK / NACK feedback information. The complex symbol sequence is obtained by multiplying the modulation symbol of the ACK / NACK feedback information by the first sequence element by element, and the terminal device transmits the complex symbol sequence at the ACK / NACK resource position. Accordingly, the first network device receives the complex symbol sequence, detects the first sequence, and determines that the terminal device has sent a scheduling request.

[0178] Optionally, when the terminal device sends ACK / NACK feedback information of message 2 to the first network device, a buffer status report (BSR) or data size can be sent at the same time. The buffer status report or data size is used to provide the first network device with information about the amount of data available for transmission in the uplink buffer. For example, when the amount of data corresponding to the BSR is the first amount of data, the terminal device can determine a complex symbol sequence based on the first sequence and the modulation symbol of the ACK / NACK feedback information. The complex symbol sequence is obtained by multiplying the modulation symbol of the ACK / NACK feedback information by the first sequence element by element, and the terminal device transmits the complex symbol sequence at the ACK / NACK resource position. Accordingly, the first network device receives the complex symbol sequence, detects the first sequence, and determines that the amount of data of the terminal device is the first amount of data. Similarly, different sequences can be used to correspond to different amounts of data.

[0179] Embodiment 2:

[0180] In the embodiment of the present application, in addition to scheduling ACK / NACK feedback information through DCI, ACK / NACK feedback information can also be scheduled through message 2. Figure 3 In the process shown, if ACK / NACK feedback information is scheduled through message 2, at this time, in step 304, the DCI sent by the first network device to the terminal device does not include the first information. Correspondingly, in step 305, the message 2 sent by the first network device to the terminal device includes the first information. The other steps in embodiment 2 may be the same as those in embodiment 1, and the specific description may refer to embodiment 1, which will not be repeated here.

[0181] The first information included in message 2 is used to schedule ACK / NACK feedback information of the message 2. There may be multiple implementation methods for the first information, which are described below respectively.

[0182] In a first possible implementation manner, the first information includes first indication information but does not include second indication information, and the number of repetitions of the ACK / NACK feedback information indicated by the second indication information is indicated by a system message or is set.

[0183] In a second possible implementation manner, the first information includes the second indication information but does not include the first indication information, and the subcarrier spacing of the ACK / NACK feedback information indicated by the first indication information is indicated by a system message or is set.

[0184] In a third possible implementation manner, the first information includes first indication information and second indication information.

[0185] Exemplarily, since message 2 includes more bits, it can carry more information. Therefore, when message 2 includes the first information, the first information may also include one or more of the following:

[0186] The third indication information is used to determine the position of the subcarrier for transmitting the ACK / NACK feedback information; wherein the position of the subcarrier is used to indicate the frequency domain resource position of the ACK / NACK feedback information, indicating which subcarrier is used to transmit the ACK / NACK feedback information. For example, assuming that the subcarrier interval of the ACK / NACK feedback information is 15kHz, there are 12 subcarriers in the 180kHz bandwidth, and the subcarrier index value set is 0 to 11, the third indication information can be the index of the subcarrier. When the third indication information is 1, it indicates that the position of the subcarrier is the position corresponding to the subcarrier with an index of 2.

[0187] Fourth indication information, the fourth indication information is used to determine the scheduling delay of the ACK / NACK feedback information; the scheduling delay is the time between the end of message 2 transmission and the start of ACK / NACK feedback information transmission.

[0188] Fifth indication information, the fifth indication information is used to determine a target receiving power of the ACK / NACK feedback information; the terminal device can thereby determine a sending power for sending the ACK / NACK feedback information according to the target receiving power.

[0189] Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information;

[0190] Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

[0191] As an example, the terminal device may determine the transmission power for sending ACK / NACK feedback information according to the fifth indication information and / or the sixth indication information. For example, the target receiving power of the ACK / NACK feedback information determined according to the fifth indication information is p0, the path loss compensation factor of the ACK / NACK feedback information is α, α is determined according to the sixth indication information or indicated by a system message or preset, and the transmission power of the ACK / NACK feedback information p=min{p max , 10log10(M)+p0+α·PL}, where p max is the maximum transmission power of the terminal device configured by the first network device, M is a preset value related to the subcarrier spacing of the ACK / NACK feedback information, and PL is the downlink path loss estimated by the terminal device.

[0192] It should be noted that in an embodiment of the present application, when message 2 includes first information, the first information can be carried by a media access control (MAC) control element (CE) or a MAC protocol data unit (PDU) in message 2, and can be multiplexed into message 2 together with downlink data.

[0193] Embodiment three:

[0194] In the embodiment of the present application, ACK / NACK feedback information can also be jointly scheduled by DCI and message 2. In this implementation, the first information includes a first part and a second part. Figure 3 In the process shown, in step 304, the DCI sent by the first network device to the terminal device includes the first part. Correspondingly, in step 305, the message 2 sent by the first network device to the terminal device includes the second part. The other steps in the third embodiment may be the same as those in the first embodiment, and the specific steps may refer to the description in the first embodiment, which will not be repeated here.

[0195] In a first possible implementation manner, the indication information included in each of the first part and the second part is complete indication information, that is, all bits of an indication information are included in the first part or in the second part.

[0196] For example, the first part may include first indication information, and the second part may include second indication information.

[0197] For another example, the first part may include the second indication information, and the second part includes the first indication information.

[0198] Exemplarily, the second part may also include one or more of third indication information, fourth indication information, fifth indication information, sixth indication information, and seventh indication information.

[0199] In a second possible implementation manner, the first part and the second part may be combined to include the first indication information, and the first part and the second part may also be combined to include the second indication information.

[0200] In this implementation, the first indication information includes bits that can be divided into a first sub-part and a second sub-part, the first part includes the first sub-part, and the second part includes the second sub-part; correspondingly, the second indication information includes bits that can be divided into a third sub-part and a fourth sub-part, the first part includes the third sub-part, and the second part includes the fourth sub-part.

[0201] For example, the second indication information uses 3 bits to indicate the number of repetitions of the ACK / NACK feedback information, and the 3 bits can be divided into a first sub-part and a second sub-part, the first sub-part is 1 most significant bit, and the second sub-part is the remaining 2 bits. The DCI includes the first sub-part, and the message 2 includes the second sub-part, that is, the DCI uses 1 bit to indicate the most significant bit of the number of repetitions of the ACK / NACK feedback information, and the message 2 uses 2 bits to indicate the lower 2 bits of the number of repetitions of the ACK / NACK feedback information.

[0202] Of course, the above is just an example. When the second indication information uses X+Y bits to indicate the number of repetitions of the ACK / NACK feedback information, the DCI may also include the least significant X bits of the number of repetitions of the ACK / NACK feedback information, and the message 2 may include the remaining most significant Y bits of the number of repetitions of the ACK / NACK feedback information, where X and Y are both integers greater than 0.

[0203] The above examples are also applicable to the case of the first indication information. It can be deduced based on the above examples how to jointly indicate the first indication information, which will not be described in detail here.

[0204] For the first indication information to the seventh indication information in this embodiment, reference may be made to the descriptions in Embodiment 1 and Embodiment 2, and will not be repeated here.

[0205] In the previous embodiment, it is described how to schedule the ACK / NACK feedback information of message 2. Figure 3In the process, in step 301, the first paging message sent by the first network device to the terminal device includes resource indication information for indicating RACH resources. In the prior art, when the first network device allocates RACH resources, it allocates them according to the method agreed in the standard. The allocated RACH resources may not match the capabilities of the terminal device. For this reason, a resource allocation method is also provided in an embodiment of the present application to solve the above problem, which will be described in detail below.

[0206] It should be noted that the fourth embodiment can be combined with any of the above embodiments one to three, or can be implemented as a separate solution, and the embodiments of the present application are not limited to this.

[0207] Embodiment 4:

[0208] like Figure 4 The figure is a flow chart of a data transmission method provided in an embodiment of the present application. Figure 4 In the process shown, the first network device may be an access network device, and the second network device may be a core network device. Figure 4 , the method comprising:

[0209] Step 401: The terminal device sends second information to the first network device.

[0210] The second information includes capability information of the terminal device and related to paging. In other words, the second information includes capability information of the terminal device and required for paging. For example, the second information may include one or more of the following:

[0211] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0212] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0213] The third capability information is used to indicate whether the terminal device supports EDT for user-plane cellular Internet of Things (CIoT) Evolved Packet System (EPS) optimization.

[0214] Combined with the above capability information, for example, the early data transmission optimized for the user plane CIoT EPS carries the uplink data through the RRC connection resumption request (RRCConnectionResumeRequest) message. The early data transmission optimized for CIoT EPS and the normal random access process are distinguished by different random access resources. The early data transmission optimized for CIoT EPS corresponds to the first random access resource, and the normal random access process corresponds to the second random access resource. The terminal device initiates the early data transmission process optimized for CIoT EPS through the first random access resource, and the terminal device initiates the normal random access process through the second random access resource.

[0215] Exemplarily, the second information may also include one or more of the following:

[0216] The fourth capability information is used to indicate whether the terminal device supports the hybrid deployment mode in multi-carrier deployment.

[0217] The fifth capability information is used to indicate the terminal device category, and the terminal device category may be NB1 or NB2 or other categories.

[0218] Step 402: The first network device forwards the second information to the second network device.

[0219] After completing the above process, when the second network device determines that downlink data needs to be sent to the terminal device, the following steps may also be included:

[0220] Step 403: The second network device sends a second paging message to the first network device.

[0221] The second paging message includes the second information. The second paging message may also include other information, which can be specifically referred to in the description of the prior art and will not be described in detail here.

[0222] Step 404: The first network device receives a second paging message from the second network device, and allocates RACH resources to the terminal device according to second information in the second paging message.

[0223] For example, the second information includes the first capability information, and the first capability information indicates that the terminal device supports random access on a non-anchor carrier, then the first network device can allocate RACH resources on the non-anchor carrier to the terminal device. The second information includes the second capability information, and the second capability information indicates that the terminal device supports the use of preamble format 2, then the first network device can allocate RACH resources corresponding to preamble format 2 to the terminal device. The second information includes the third capability information, and the third capability information indicates that for the user plane CIoT EPS optimization, when the terminal device supports EDT, the first network device can allocate RACH resources corresponding to EDT to the terminal device. For the above situations, the first network device can also allocate RACH resources on the anchor carrier to the terminal device.

[0224] When the second information does not include the first capability information, the second capability information and the third capability information, the first network device may allocate a RACH resource located on the anchor carrier to the terminal device.

[0225] For the definition of anchor carrier and non-anchor carrier, for example, in the NB-IoT system, for frequency division duplex (FDD), the anchor carrier refers to the carrier on which the terminal device assumes that there is narrowband primary synchronization signal (NPSS) / narrowband secondary synchronization signal (NSSS) / narrowband physical broadcast channel (NPBCH) / narrowband system information block (SIB-NB) transmission; for time division duplex (TDD), the anchor carrier refers to the carrier on which the terminal device assumes that there is NPSS / NSSS / NPBCH transmission.

[0226] In the NB-IoT system, for FDD, the non-anchor carrier refers to the carrier on which the terminal device assumes there is no NPSS / NSSS / NPBCH / SIB-NB transmission. For TDD, the non-anchor carrier refers to the carrier on which the terminal device assumes there is no NPSS / NSSS / NPBCH transmission.

[0227] For the definition of preamble format 2, for example, in the NB-IoT system, preamble format 2 is a new preamble format introduced in Rel-15, the purpose is to support a larger cell radius, the cell radius is greater than 100km, preamble format 2 includes 6 symbol groups in the time domain, each symbol group includes 1 cyclic prefix (CP) and 3 symbols, the CP length is 800μs, and the length of each symbol is also 800μs. The subcarrier spacing of preamble format 2 is 1.25kHz.

[0228] Step 405: The first network device determines a first paging message to be sent to the terminal device according to the second paging message, and sends the first paging message to the terminal device.

[0229] The first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource.

[0230] In the above solution, the first network device allocates RACH resources according to the second information of the terminal device, so that RACH resources matching the capabilities of the terminal device can be allocated, thereby improving resource utilization efficiency.

[0231] The embodiment described above is for the downlink data transmission scenario of MT-EDT. The embodiment of the present application also provides a method that can be applied to the scenario of normal downlink data transmission. The so-called normal downlink data transmission scenario may refer to the scenario of downlink data transmission between the terminal device and the first network device when the terminal device is in the RRC connection state.

[0232] Embodiment five:

[0233] Step 1: The first network device sends a DCI to the terminal device.

[0234] The format of the DCI may be DCI format N1. The DCI is used to schedule a downlink message.

[0235] In a possible implementation manner, the DCI may include second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0236] When the DCI includes the number of repetitions of the ACK / NACK feedback information of the downlink message, the specific implementation method can refer to Figure 3 In the process shown, the implementation method when DCI includes the second indication information is not repeated here.

[0237] Step 2: The first network device sends a DCI scheduling downlink message to the terminal device.

[0238] In a possible implementation manner, when the DCI does not include the second indication information, the downlink message may include the second indication information.

[0239] Step three: The terminal device receives the DCI from the first network device and the downlink message scheduled by the DCI.

[0240] The downlink message includes downlink data that needs to be transmitted to the terminal device.

[0241] Step 4: The terminal device sends the ACK / NACK feedback information to the first network device according to the number of repetitions.

[0242] Step 5: The first network device receives ACK / NACK feedback information from the terminal device.

[0243] In the above method, the number of repetitions of the ACK / NACK feedback information of the downlink message carried in the DCI or downlink message is used to flexibly adjust the number of repetitions of the ACK / NACK feedback information, improve the power control of the ACK / NACK feedback information, and avoid uplink interference to other terminal devices caused by the ACK / NACK feedback information when transmitting at full power.

[0244] It should be noted that when the downlink message includes the first information, the first information may be indicated by the MACCE or MAC PDU in the downlink message, and may be multiplexed into the downlink message together with the downlink data.

[0245] Optionally, in a possible implementation, when the DCI includes the second indication information, the downlink message may also include at least one of the first indication information and the third indication information to the seventh indication information. The specific contents of the first indication information and the third indication information to the seventh indication information may refer to the description in Embodiments 1 to 3, and will not be repeated here.

[0246] Optionally, in a possible implementation, when the DCI includes the second indication information and the downlink message does not include the first indication information of the subcarrier spacing of the subcarrier for determining the ACK / NACK feedback information, the DCI may also include the first indication information. When the DCI includes the first indication information and the second indication information, the specific implementation method may refer to Figure 3 In the process shown, the implementation method when DCI includes the first indication information and the second indication information is not repeated here.

[0247] Optionally, in a possible implementation manner, the DCI and the downlink message may be jointly included to include the first indication information, and the DCI and the downlink message may also be jointly included to include the second indication information.

[0248] When the DCI and the downlink message can be jointly included to include the first indication information, the first indication information includes bits that can be divided into a first sub-part and a second sub-part, the DCI includes the first sub-part, and the downlink message includes the second sub-part; correspondingly, when the DCI and the downlink message can be jointly included to include the second indication information, the second indication information includes bits that can be divided into a third sub-part and a fourth sub-part, the DCI includes the third sub-part, and the downlink message includes the fourth sub-part.

[0249] For example, the second indication information uses 3 bits to indicate the number of repetitions of the ACK / NACK feedback information, and the 3 bits can be divided into a first sub-part and a second sub-part, the first sub-part is 1 most significant bit, and the second sub-part is the remaining 2 bits. The DCI includes the first sub-part, and the downlink message includes the second sub-part, that is, the DCI uses 1 bit to indicate the most significant bit of the number of repetitions of the ACK / NACK feedback information, and the downlink message uses 2 bits to indicate the lower 2 bits of the number of repetitions of the ACK / NACK feedback information.

[0250] For Embodiments 1 to 5, the format of the DCI used to schedule message 2 or downlink message may be format N1. The DCI may be monitored by the terminal device in a Type-2 common search space (CSS). Accordingly, the first network device sends the DCI to the terminal device in the Type-2 CSS for scheduling message 2 or downlink message.

[0251] For Embodiments 2 to 5, the specific manner in which the terminal device sends ACK / NACK feedback information of message 2 to the first network device may refer to the description in Embodiment 1.

[0252] In the embodiments provided by the present application, the methods provided by the embodiments of the present application are introduced from the perspective of interaction between various devices. In order to implement the functions in the methods provided by the embodiments of the present application, the terminal device and the first network device may include a hardware structure and / or a software module to implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0253] Same as above idea, Figure 5As shown, the embodiment of the present application also provides a device 500 for implementing the functions of the terminal device or the first network device in the above method. For example, the device can be a software module or a chip system. In the embodiment of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices. The device 500 may include: a processing unit 501 and a communication unit 502.

[0254] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0255] For example, when the apparatus 500 implements Figure 3 Or the function of the terminal device in the process shown in 4:

[0256] A communication unit 502 is configured to send a message 1 to a first network device, wherein the message 1 includes a random access preamble; receive downlink control information DCI from the first network device and a message 2 scheduled by the DCI; the message 2 includes downlink data, and the DCI and / or the message 2 include first information, and the first information is used to schedule ACK / NACK feedback information of the message 2;

[0257] The processing unit 501 is configured to determine the ACK / NACK feedback information;

[0258] The communication unit 502 is configured to send the ACK / NACK feedback information to the first network device according to the first information.

[0259] In a possible design, the processing unit 501 is specifically used for:

[0260] Determine the time-frequency resources, subcarrier spacing, and number of repetitions of the ACK / NACK feedback information;

[0261] The communication unit 502 is specifically configured to send the ACK / NACK feedback information according to the time-frequency resources, subcarrier spacing, and number of repetitions;

[0262] The DCI or the message 2 includes the first information, and the first information includes one or more of the following:

[0263] first indication information, where the first indication information is used to determine a subcarrier spacing of a subcarrier for transmitting the ACK / NACK feedback information;

[0264] Second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0265] In one possible design, the DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated or set by a system message; or, when the first information only includes the second indication information, the subcarrier spacing of the subcarrier transmitting the ACK / NACK feedback information is indicated or set by a system message.

[0266] In one possible design, when the DCI includes the first information, the DCI includes at least one of a first field for transmitting first indication information and a second field for transmitting second indication information; the first indication information is a state value of a bit included in the first field, and the second indication information is a state value of a bit included in the second field;

[0267] Different state values ​​of the bits included in the first field are used to indicate different subcarrier spacings;

[0268] Different state values ​​of the bits included in the second field are used to indicate different numbers of repetitions.

[0269] In one possible design, when the message 2 includes the first information, the first information also includes one or more of the following: third indication information, the third indication information is used to determine the position of the subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, the fourth indication information is used to determine the scheduling delay of the ACK / NACK feedback information; fifth indication information, the fifth indication information is used to determine the target receiving power of the ACK / NACK feedback information; sixth indication information, the sixth indication information is used to determine the path loss compensation factor for transmitting the ACK / NACK feedback information; seventh indication information, the seventh indication information is used to determine the timing advance for transmitting the ACK / NACK feedback information.

[0270] In one possible design, the DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0271] In one possible design, before the communication unit 502 sends the message 1 to the first network device, the communication unit 502 is further configured to:

[0272] Receive a first paging message from the first network device, the first paging message including resource indication information, the resource indication information being used to indicate a random access channel RACH resource allocated for the terminal device, the RACH resource being used to carry the message 1; the RACH resource is allocated based on second information, the second information including capability information of the terminal device and related to paging.

[0273] In one possible design, the second information includes one or more of the following:

[0274] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0275] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0276] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

[0277] In one possible design, before the communication unit 502 receives the first paging message from the first network device, the communication unit 502 is further configured to:

[0278] The second information is sent to the first network device.

[0279] For example, when the apparatus 500 implements Figure 3 Or the function of the first network device in the process shown in 4 is:

[0280] The communication unit 502 is configured to receive a message 1 from a terminal device, wherein the message 1 includes a random access preamble;

[0281] The processing unit 501 is configured to determine first information, where the first information is used for ACK / NACK feedback information of the scheduling message 2;

[0282] The communication unit 502 is used to send downlink control information DCI and the message 2 scheduled by the DCI to the terminal device; the DCI and / or the message 2 include the first information; and receive the ACK / NACK feedback information from the terminal device.

[0283] In one possible design, the DCI or the message 2 includes the first information, and the first information includes one or more of the following:

[0284] first indication information, where the first indication information is used to determine a subcarrier spacing of a subcarrier for transmitting the ACK / NACK feedback information;

[0285] Second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0286] In one possible design, when the DCI includes the first information, the DCI includes at least one of a first field for transmitting first indication information and a second field for transmitting second indication information; the first indication information is a state value of a bit included in the first field, and the second indication information is a state value of a bit included in the second field;

[0287] Different state values ​​of the bits included in the first field are used to indicate different subcarrier spacings;

[0288] Different state values ​​of the bits included in the second field are used to indicate different numbers of repetitions.

[0289] In one possible design, when the message 2 includes the first information, the first information also includes one or more of the following: third indication information, the third indication information is used to determine the position of the subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, the fourth indication information is used to determine the scheduling delay of the ACK / NACK feedback information; fifth indication information, the fifth indication information is used to determine the target receiving power of the ACK / NACK feedback information; sixth indication information, the sixth indication information is used to determine the path loss compensation factor for transmitting the ACK / NACK feedback information; seventh indication information, the seventh indication information is used to determine the timing advance for transmitting the ACK / NACK feedback information.

[0290] In one possible design, the DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated or set by a system message; or, when the first information only includes the second indication information, the subcarrier spacing of the subcarrier transmitting the ACK / NACK feedback information is indicated or set by a system message.

[0291] In one possible design, the DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

[0292] In one possible design, before the communication unit 502 receives the message 1 from the terminal device, the communication unit 502 is further used to: receive a second paging message from a second network device, where the second paging message includes second information, where the second information includes capability information of the terminal device and related to paging;

[0293] The processing unit 501 is further configured to allocate a random access channel RACH resource to the terminal device according to the second information, and determine a first paging message to be sent to the terminal device according to the second paging message, wherein the first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource;

[0294] The communication unit 502 is further configured to send the first paging message to the terminal device.

[0295] In one possible design, the second information includes one or more of the following:

[0296] The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier;

[0297] The second capability information is used to indicate whether the terminal device supports the use of preamble format 2;

[0298] The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

[0299] In one possible design, before the communication unit 502 receives the second paging message from the second network device, the communication unit 502 is further configured to:

[0300] Receive the second information from the terminal device, and send the second information to the second network device.

[0301] like Figure 6 The device 600 provided in the embodiment of the present application is shown. Figure 6 The device shown can be Figure 5A hardware circuit implementation of the device shown in FIG. Figure 3-4 In the flowchart shown, the functions of the terminal device or the first network device in the above method embodiment are executed. Figure 6 Only the main components of the communication device are shown.

[0302] Figure 6 The device 600 shown includes at least one processor 620, which is used to implement the embodiment of the present application. Figure 3-4 Any of the methods.

[0303] The device 600 may also include at least one memory 630 for storing program instructions and / or data. The memory 630 is coupled to the processor 620. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 620 may operate in coordination with the memory 630. The processor 620 may execute program instructions stored in the memory 630. At least one of the at least one memory may be included in the processor.

[0304] The device 600 may also include a communication interface 610 for communicating with other devices via a transmission medium, so that the device in the device 600 can communicate with other devices. In the embodiment of the present application, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces. In the embodiment of the present application, the transceiver may be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit. The processor 620 uses the communication interface 610 to send and receive data, and is used to implement Figure 3-4 The method executed by the terminal device or the first network device in the corresponding embodiment can be specifically referred to the previous description and will not be repeated here.

[0305] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) that contain computer-usable program code.

[0306] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0307] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0308] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A data transmission method, characterized in that: include: The terminal device sends a message 1 to the first network device, where the message 1 includes a random access preamble code; The terminal device receives downlink control information DCI from the first network device and message 2 scheduled by the DCI; the message 2 includes downlink data, the DCI and / or the message 2 includes first information, and the first information is used to schedule confirmation ACK / negative confirmation NACK feedback information of the message 2; The terminal device sends the ACK / NACK feedback information to the first network device according to the first information; wherein the terminal device determines the time-frequency resources, subcarrier spacing and number of repetitions of the ACK / NACK feedback information; the terminal device sends the ACK / NACK feedback information according to the time-frequency resources, subcarrier spacing and number of repetitions; wherein the DCI or the message 2 includes the first information, and the first information includes one or more of the following: first indication information, the first indication information is used to determine the subcarrier spacing of the subcarrier for transmitting the ACK / NACK feedback information; second indication information, the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

2. The method according to claim 1, characterized in that The DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated by a system message or is set; or, When the first information only includes the second indication information, the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information is indicated or set by a system message.

3. The method according to claim 1 or 2, characterized in that: When the message 2 includes the first information, the first information also includes one or more of the following: third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information; fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information; Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information; Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

4. The method according to claim 1, characterized in that: The DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; The first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

5. The method according to any one of claims 1 to 2, characterized in that: Before the terminal device sends message 1 to the first network device, the method further includes: The terminal device receives a first paging message from the first network device, the first paging message including resource indication information, the resource indication information being used to indicate a random access channel RACH resource allocated for the terminal device, the RACH resource being used to carry the message 1; the RACH resource is allocated based on second information, the second information including capability information of the terminal device and related to paging.

6. The method according to claim 5, characterized in that The second information includes one or more of the following: The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier; The second capability information is used to indicate whether the terminal device supports the use of preamble format 2; The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

7. The method according to claim 5, characterized in that Before the terminal device receives the first paging message from the first network device, the method further includes: The terminal device sends the second information to the first network device.

8. A data transmission method, characterized in that: include: The first network device receives a message 1 from the terminal device, wherein the message 1 includes a random access preamble; The first network device sends downlink control information DCI and message 2 scheduled by the DCI to the terminal device; the DCI and / or the message 2 include first information, and the first information is used to schedule confirmation ACK / negative confirmation NACK feedback information of the message 2; The first network device receives the ACK / NACK feedback information from the terminal device; wherein the DCI or the message 2 includes the first information, and the first information includes one or more of the following: first indication information, where the first indication information is used to determine a subcarrier spacing of a subcarrier for transmitting the ACK / NACK feedback information; Second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

9. The method according to claim 8, characterized in that in, When the message 2 includes the first information, the first information also includes one or more of the following: third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information; fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information; Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information; Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

10. The method according to claim 9, characterized in that The DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated by a system message or is set; or, When the first information only includes the second indication information, the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information is indicated or set by a system message.

11. The method according to claim 8, characterized in that The DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; The first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

12. The method according to any one of claims 8 to 11, characterized in that: Before the first network device receives the message 1 from the terminal device, the method further includes: The first network device receives a second paging message from a second network device, where the second paging message includes second information, where the second information includes capability information of the terminal device and related to paging; The first network device allocates a random access channel RACH resource to the terminal device according to the second information, and determines a first paging message to be sent to the terminal device according to the second paging message, wherein the first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource; The first network device sends the first paging message to the terminal device.

13. The method according to claim 12, characterized in that The second information includes one or more of the following: The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier; The second capability information is used to indicate whether the terminal device supports the use of preamble format 2; The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

14. The method according to claim 12, characterized in that Before the first network device receives the second paging message from the second network device, the method further includes: The first network device receives the second information from the terminal device, and sends the second information to the second network device.

15. A communication device, characterized in that: include: A communication unit, configured to send a message 1 to a first network device, wherein the message 1 includes a random access preamble; receive downlink control information DCI from the first network device and a message 2 scheduled by the DCI; the message 2 includes downlink data, the DCI and / or the message 2 includes first information, and the first information is used to schedule ACK / NACK feedback information of the message 2; a processing unit, configured to determine the ACK / NACK feedback information; The communication unit is further configured to send the ACK / NACK feedback information to the first network device according to the first information; wherein the processing unit is specifically configured to: Determine the time-frequency resources, subcarrier spacing, and number of repetitions of the ACK / NACK feedback information; The communication unit is specifically configured to send the ACK / NACK feedback information according to the time-frequency resources, subcarrier spacing, and number of repetitions; The DCI or the message 2 includes the first information, and the first information includes one or more of the following: first indication information, where the first indication information is used to determine a subcarrier spacing of a subcarrier for transmitting the ACK / NACK feedback information; Second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

16. The device according to claim 15, characterized in that The DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated by a system message or is set; or, When the first information only includes the second indication information, the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information is indicated or set by a system message.

17. The device according to claim 15 or 16, characterized in that When the message 2 includes the first information, the first information also includes one or more of the following: third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information; fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information; Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information; Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

18. The device according to claim 15, characterized in that The DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; The first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

19. The device according to any one of claims 15 to 16, characterized in that: Before the communication unit sends the message 1 to the first network device, the communication unit is further configured to: Receive a first paging message from the first network device, the first paging message including resource indication information, the resource indication information being used to indicate a random access channel RACH resource allocated for the terminal device, the RACH resource being used to carry the message 1; the RACH resource being allocated based on second information, the second information including capability information of the terminal device and related to paging.

20. The device according to claim 19, characterized in that The second information includes one or more of the following: The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier; The second capability information is used to indicate whether the terminal device supports the use of preamble format 2; The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

21. The device according to claim 19, characterized in that Before the communication unit receives the first paging message from the first network device, the communication unit is further configured to: The second information is sent to the first network device.

22. A data transmission device, characterized in that: include: A communication unit, configured to receive a message 1 from a terminal device, wherein the message 1 includes a random access preamble; A processing unit, configured to determine first information, where the first information is used for ACK / NACK feedback information of scheduling message 2; The communication unit is further configured to send downlink control information DCI and the message 2 scheduled by the DCI to the terminal device; the DCI and / or the message 2 include the first information; and receive the ACK / NACK feedback information from the terminal device; the DCI or the message 2 includes the first information, and the first information includes one or more of the following: first indication information, where the first indication information is used to determine a subcarrier spacing of a subcarrier for transmitting the ACK / NACK feedback information; Second indication information, where the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

23. The device according to claim 22, characterized in that in, When the message 2 includes the first information, the first information also includes one or more of the following: third indication information, where the third indication information is used to determine a position of a subcarrier for transmitting the ACK / NACK feedback information; fourth indication information, where the fourth indication information is used to determine a scheduling delay for the ACK / NACK feedback information; fifth indication information, where the fifth indication information is used to determine a target received power of the ACK / NACK feedback information; Sixth indication information, where the sixth indication information is used to determine a path loss compensation factor for transmitting the ACK / NACK feedback information; Seventh indication information, where the seventh indication information is used to determine a timing advance for transmitting the ACK / NACK feedback information.

24. The device according to claim 22, characterized in that The DCI includes time-frequency resource information of the ACK / NACK feedback information, and when the first information only includes the first indication information, the number of repetitions of the ACK / NACK feedback information is indicated by a system message or is set; or, When the first information only includes the second indication information, the subcarrier spacing of the ACK / NACK feedback information is indicated or set by a system message; the first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

25. The device according to claim 22, characterized in that The DCI and the message 2 include the first information, the first information includes first indication information and second indication information, the DCI includes the first indication information, and the message 2 includes the second indication information, or the DCI includes the second indication information, and the message 2 includes the first indication information; The first indication information is used to determine the subcarrier spacing of the subcarriers for transmitting the ACK / NACK feedback information; and the second indication information is used to determine the number of repetitions of the ACK / NACK feedback information.

26. The device according to any one of claims 22 to 25, characterized in that Before the communication unit receives the message 1 from the terminal device, the communication unit is further used for: receiving a second paging message from a second network device, wherein the second paging message includes second information, and the second information includes capability information of the terminal device and related to paging; The processing unit is further configured to allocate a random access channel RACH resource to the terminal device according to the second information, and determine a first paging message to be sent to the terminal device according to the second paging message, wherein the first paging message includes resource indication information, and the resource indication information is used to indicate the RACH resource; The communication unit is further used to send the first paging message to the terminal device.

27. The device according to claim 26, characterized in that The second information includes one or more of the following: The first capability information is used to indicate whether the terminal device supports initiating random access on a non-anchor carrier; The second capability information is used to indicate whether the terminal device supports the use of preamble format 2; The third capability information is used to indicate whether the terminal device supports early data transmission EDT for the user plane cellular Internet of Things evolved packet system CIoT EPS optimization.

28. The device according to claim 26, characterized in that Before the communication unit receives the second paging message from the second network device, the communication unit is further configured to: Receive the second information from the terminal device, and send the second information to the second network device.

29. A communication device, characterized in that: include: A memory and a processor, wherein the memory is used to store instructions, and the processor is used to execute the instructions stored in the memory, and the execution of the instructions stored in the memory enables the processor to execute the method according to any one of claims 1 to 14.

30. A computer-readable storage medium, characterized in that: The method comprises computer-readable instructions, and when a communication device reads and executes the computer-readable instructions, the communication device executes the method according to any one of claims 1 to 14.

31. A computer program product, characterized in that The method comprises computer-readable instructions, and when a communication device reads and executes the computer-readable instructions, the communication device executes the method according to any one of claims 1 to 14.

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