Random access method, device and system

Abstract

The invention provides a random access method, device and system, which are applied to the field of wireless communication. The random access method provided by the invention comprises the following steps: receiving first control information; the first control information is used for indicating the number of repeated sending times of the first feedback information and a first reserved resource; wherein the number of repeated sending times of the first feedback information is greater than or equal to 1; the first feedback information is used for indicating a decoding result of the message BMsgB or the message 4Msg4; the first reserved resource is one reserved resource in one or more reserved resources; each reserved resource in the one or more reserved resources is used for sending the first feedback information once. And determining one or more reserved resources according to the first control information. Based on the random access method provided by the invention, the first feedback information can be repeatedly sent, and coverage enhancement is carried out on a channel bearing the first feedback information, namely a channel bearing MsgB / Msg4 feedback information.

Description

[0001] This application is a divisional application. The application number of the original application is 202310182890.1, and the original application date is February 17, 2023. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of wireless communications, and in particular to a random access method, device and system. Background Art

[0003] In wireless communication systems, compared with terrestrial communications, satellite communications have longer communication distances and greater path losses, which results in lower link budgets. In view of this, further coverage enhancement is needed to enable direct connection between terminal devices on the ground and base stations deployed on satellites. Summary of the invention

[0004] Embodiments of the present application provide a random access method, apparatus, and system for enhancing coverage of a channel carrying feedback information corresponding to Msg4 / MsgB.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a random access method is provided, which can be performed by a second communication device, which can be a terminal device or a component of the terminal device (such as a processor, a chip, or a chip system, etc.). The following is an example of the second communication device performing the method, which includes: the second communication device receives first control information; the first control information is used to indicate the number of repeated transmissions of the first feedback information and the first reserved resource; wherein the number of repeated transmissions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate the decoding result of the message BMsgB or the message 4Msg4; the first reserved resource is one of the one or more reserved resources; the number of the one or more reserved resources is the same as the number of repeated transmissions of the first feedback information; each of the one or more reserved resources is used to transmit the first feedback information once. The second communication device determines one or more reserved resources according to the first control information.

[0007] Based on the random access method provided in the embodiment of the present application, the second communication device can determine the number of repeated transmissions of the first feedback information and the reserved resources for sending the first feedback information according to the first control information, thereby achieving repeated transmission of the first feedback information and performing coverage enhancement on the channel carrying the first feedback information, i.e., the channel carrying the feedback information of MsgB / Msg4.

[0008] In combination with the first aspect above, in one possible design, the method further includes: the second communication device receives MsgB or Msg4, and then sends the first feedback information through one or more reserved resources. Based on this solution, the second communication device can send the first feedback information through the reserved resources to achieve coverage enhancement of the channel carrying the first feedback information.

[0009] In combination with the first aspect above, in a possible design, the method further includes: the second communication device sends first indication information; the first indication information is used to indicate the ability to repeatedly send the first feedback information. Based on this solution, the second communication device can indicate its ability to repeatedly send the first feedback information, so that the first communication device can indicate an appropriate number of repeated transmissions of the first feedback information according to the ability of the second communication device.

[0010] In combination with the first aspect above, in a possible design, the method further includes: the second communication device sends a second indication information; the second indication information is used to indicate a request to repeatedly send the first feedback information. Based on this solution, the second communication device can request the first communication device to repeatedly send the first feedback information, so that the first communication device determines that the second communication device can repeatedly send the first feedback information.

[0011] In combination with the first aspect above, in a possible design, the second indication information is used to indicate a request to repeatedly send the first feedback information, including: the second indication information is used to indicate the number of times the first feedback information is requested to be repeatedly sent. Based on this solution, the second communication device can indicate to the first communication device the number of times it requests to repeatedly send the first feedback information, so that the first communication device can indicate an appropriate number of times the first feedback information is repeatedly sent.

[0012] In combination with the first aspect above, in a possible design, the first control information includes third indication information; the third indication information is used to determine the first index and the second index, the first index is the index corresponding to the first resource, and the second index is the index corresponding to the first reserved resource; the number of repeated transmissions of the first feedback information is the same as the number of symbols of the first resource. Based on this solution, the number of repeated transmissions of the first feedback information and the first reserved resource can be indicated by one piece of information, saving signaling overhead.

[0013] In combination with the first aspect above, in a possible design, the method further includes: the second communication device determines the first index according to the third indication information, and determines the first resource according to the first index; when the number of symbols of the first resource is less than the first preset threshold, determines the second index according to the first index. Based on this scheme, the third indication information can use the first index to indicate the first resource with a smaller number of symbols, implicitly indicating the number of repetitions of the first feedback information.

[0014] In combination with the first aspect above, in a possible design, the first control information includes fourth indication information and fifth indication information; the fourth indication information is used to indicate the number of repeated transmissions of the first feedback information, and the fifth indication information is used to indicate the first reserved resource. Based on this solution, the number of repeated transmissions of the first feedback information and the first reserved resource can be indicated respectively through two pieces of information.

[0015] In combination with the first aspect above, in a possible design, the method further includes: the second communication device receives sixth indication information; the sixth indication information is used to indicate one or more candidate repetition transmission times; the fourth indication information is used to indicate the number of repetition transmission times of the first feedback information, including: the fourth indication information is an index corresponding to the number of repetition transmission times of the first feedback information in one or more candidate repetition transmission times. Based on this solution, the first communication device can directly send an index to indicate the number of repetition transmission times of the first feedback information, saving signaling overhead.

[0016] In combination with the above first aspect, in one possible design, the size of each reserved resource is the same.

[0017] In combination with the first aspect above, in one possible design, among the multiple reserved resources, the positional relationship between the reserved resources other than the first reserved resource and the first reserved resource in the time domain and / or frequency domain corresponds to the number of repeated transmissions of the first feedback information. Based on this solution, the second communication device can determine other reserved resources based on the positional relationship and the first reserved resource.

[0018] In combination with the above-mentioned first aspect, in a possible design, the method also includes: the second communication device receives seventh indication information; the seventh indication information is used to indicate the correspondence between the position relationship and the number of repeated sending times of the first feedback information.

[0019] In combination with the first aspect, in a possible design, the multiple reserved resources satisfy at least one of the following relationships:

[0020] Among the multiple reserved resources, two time-frequency resources that are adjacent in the time domain are continuous in the time domain;

[0021] Among the multiple reserved resources, two adjacent reserved resources in the frequency domain are continuous in the frequency domain;

[0022] Among the multiple reserved resources, the interval between two adjacent reserved resources in the time domain is the same;

[0023] Among the multiple reserved resources, the interval between two adjacent reserved resources in the frequency domain is the same.

[0024] In combination with the above-mentioned first aspect, in a possible design, the method also includes: the second communication device receives eighth indication information; the eighth indication information is used to indicate the interval between two adjacent reserved resources in the time domain, and / or the interval between two adjacent reserved resources in the frequency domain.

[0025] In a second aspect, a random access method is provided, which can be executed by a first communication device, which can be a network device or a component of the network device (such as a processor, a chip, or a chip system, etc.). The following is an example of the first communication device executing the method, which includes: the first communication device determines the first control information; the first control information is used to indicate the number of repeated transmissions of the first feedback information and the first reserved resource; the number of repeated transmissions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate the decoding result of the message BMsgB or the message 4Msg4; the first reserved resource is one of the one or more reserved resources; the number of the one or more reserved resources is the same as the number of repeated transmissions of the first feedback information; each of the one or more reserved resources is used for the transmission of the first feedback information once. The first communication device sends the first control information.

[0026] Based on the random access method provided in the embodiment of the present application, the first communication device can indicate the number of repeated transmissions of the first feedback information and the reserved resources for sending the first feedback information through the first control information, thereby achieving repeated reception of the first feedback information and enhancing the coverage of the channel carrying the first feedback information, that is, carrying the feedback information of MsgB / Msg4.

[0027] In combination with the above second aspect, in a possible design, the method further includes: the first communication device sends MsgB or Msg4. Then the first communication device receives the first feedback information through one or more reserved resources. Based on this solution, the first communication device can receive the first feedback information through the reserved resources to achieve coverage enhancement of the channel carrying the first feedback information.

[0028] In combination with the above second aspect, in a possible design, the method further includes: the first communication device receives first indication information; the first indication information is used to indicate the ability to repeatedly send the first feedback information. Based on this solution, the first communication device can determine the ability of the second communication device to repeatedly send the first feedback information, thereby indicating an appropriate number of repeated transmissions of the first feedback information.

[0029] In combination with the above second aspect, in a possible design, the method further includes: the first communication device receives second indication information; the second indication information is used to indicate a request to repeatedly send the first feedback information. Based on this solution, the first communication device can determine that the second communication device can repeatedly send the first feedback information.

[0030] In combination with the above-mentioned second aspect, in a possible design, the second indication information is used to indicate a request to repeatedly send the first feedback information, including: the second indication information is used to indicate the number of times the first feedback information is requested to be repeatedly sent. Based on this scheme, the first communication device can determine the number of times the second communication device requests to repeatedly send the first feedback information, thereby determining an appropriate number of times the first feedback information is repeatedly sent.

[0031] In combination with the above second aspect, in a possible design, the first control information includes third indication information; the third indication information is used to determine the first index and the second index, the first index is the index corresponding to the first resource, and the second index is the index corresponding to the first reserved resource; the number of repeated transmissions of the first feedback information is the same as the number of symbols of the first resource. Based on this solution, the number of repeated transmissions of the first feedback information and the first reserved resource can be indicated by one piece of information, saving signaling overhead.

[0032] In combination with the above second aspect, in a possible design, the first control information includes fourth indication information and fifth indication information; the fourth indication information is used to indicate the number of repeated transmissions of the first feedback information, and the fifth indication information is used to indicate the first reserved resource. Based on this solution, the number of repeated transmissions of the first feedback information and the first reserved resource can be indicated by two pieces of information, respectively.

[0033] In combination with the above second aspect, in a possible design, the method further includes: the first communication device sends sixth indication information; the sixth indication information is used to indicate one or more candidate repetition transmission times; the fourth indication information is used to indicate the number of repetition transmission times of the first feedback information, including: the fourth indication information is an index corresponding to the number of repetition transmission times of the first feedback information in one or more candidate repetition transmission times. Based on this solution, the second communication device can directly send an index to indicate the number of repetition transmission times of the first feedback information, saving signaling overhead.

[0034] In combination with the above second aspect, in one possible design, the size of each reserved resource is the same.

[0035] In combination with the above second aspect, in one possible design, among the multiple reserved resources, the positional relationship between the reserved resources other than the first reserved resource and the first reserved resource in the time domain and / or frequency domain corresponds to the number of repeated transmissions of the first feedback information. Based on this solution, the second communication device can determine other reserved resources based on the positional relationship and the first reserved resource.

[0036] In combination with the above-mentioned second aspect, in a possible design, the method also includes: the first communication device sends seventh indication information; the seventh indication information is used to indicate the correspondence between the position relationship and the number of repeated sending times of the first feedback information.

[0037] In combination with the second aspect, in a possible design, the multiple reserved resources satisfy at least one of the following relationships:

[0038] Among the multiple reserved resources, two reserved resources that are adjacent in the time domain are continuous in the time domain;

[0039] Among the multiple reserved resources, two adjacent reserved resources in the frequency domain are continuous in the frequency domain;

[0040] Among the multiple reserved resources, the interval between two adjacent reserved resources in the time domain is the same;

[0041] Among the multiple reserved resources, the interval between two adjacent reserved resources in the frequency domain is the same.

[0042] In combination with the above-mentioned second aspect, in a possible design, the method also includes: the first communication device sends eighth indication information; the eighth indication information is used to indicate the interval between two adjacent reserved resources in the time domain, and / or the interval between two adjacent reserved resources in the frequency domain.

[0043] In a third aspect, a communication device is provided for implementing the method described in the first aspect. The communication device may be the second communication device described in the first aspect, or a device including the second communication device, or a device included in the second communication device, such as a chip.

[0044] The communication device includes a module, unit, or means corresponding to the above method, which can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0045] In combination with the third aspect above, in a possible design, the communication device includes a transceiver module and a processing module. The transceiver module is used to receive first control information; the first control information is used to indicate the number of repeated transmissions of the first feedback information and the first reserved resource; wherein the number of repeated transmissions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate the decoding result of the message BMsgB or the message 4Msg4; the first reserved resource is one of the one or more reserved resources; the number of the one or more reserved resources is the same as the number of repeated transmissions of the first feedback information; each of the one or more reserved resources is used to transmit the first feedback information once. The processing module is used to determine one or more reserved resources according to the first control information.

[0046] In combination with the above-mentioned third aspect, in a possible design, the transceiver module is also used to receive MsgB or Msg4; and send the first feedback information through one or more reserved resources.

[0047] In combination with the third aspect above, in a possible design, the transceiver module is also used to send first indication information; the first indication information is used to indicate the ability to repeatedly send first feedback information.

[0048] In combination with the above-mentioned third aspect, in a possible design, the transceiver module is also used to send a second indication information; the second indication information is used to indicate a request to repeat sending the first feedback information.

[0049] In combination with the above-mentioned third aspect, in a possible design, the second indication information is used to indicate a request to repeatedly send the first feedback information, including: the second indication information is used to indicate the number of times the request to repeatedly send the first feedback information.

[0050] In combination with the above-mentioned third aspect, in a possible design, the first control information includes third indication information; the third indication information is used to determine the first index and the second index, the first index is the index corresponding to the first resource, and the second index is the index corresponding to the first reserved resource; the number of repeated transmissions of the first feedback information is the same as the number of symbols of the first resource.

[0051] In combination with the above-mentioned third aspect, in a possible design, the processing module is also used to determine the first index based on the third indication information, and determine the first resource based on the first index; when the number of symbols of the first resource is less than the first preset threshold, determine the second index based on the first index.

[0052] In combination with the above-mentioned third aspect, in a possible design, the first control information includes fourth indication information and fifth indication information; the fourth indication information is used to indicate the number of repeated sending times of the first feedback information, and the fifth indication information is used to indicate the first reserved resources.

[0053] In combination with the above-mentioned third aspect, in a possible design, the transceiver module is also used to receive sixth indication information; the sixth indication information is used to indicate the number of repeated transmissions of one or more candidates; the fourth indication information is used to indicate the number of repeated transmissions of the first feedback information, including: the fourth indication information is an index corresponding to the number of repeated transmissions of the first feedback information in one or more candidate repeated transmissions.

[0054] In combination with the third aspect above, in one possible design, the size of each reserved resource is the same.

[0055] In combination with the above-mentioned third aspect, in a possible design, among multiple reserved resources, the positional relationship between the reserved resources other than the first reserved resources and the first reserved resources in the time domain and / or frequency domain corresponds to the number of repeated transmissions of the first feedback information.

[0056] In combination with the above-mentioned third aspect, in a possible design, the transceiver module is also used to receive seventh indication information; the seventh indication information is used to indicate the correspondence between the position relationship and the number of repeated sending times of the first feedback information.

[0057] In combination with the third aspect, in a possible design, the multiple reserved resources satisfy at least one of the following relationships:

[0058] Among the multiple reserved resources, two time-frequency resources that are adjacent in the time domain are continuous in the time domain;

[0059] Among the multiple reserved resources, two adjacent reserved resources in the frequency domain are continuous in the frequency domain;

[0060] Among the multiple reserved resources, the interval between two adjacent reserved resources in the time domain is the same;

[0061] Among the multiple reserved resources, the interval between two adjacent reserved resources in the frequency domain is the same.

[0062] In combination with the above-mentioned third aspect, in a possible design, the transceiver module is also used to receive eighth indication information; the eighth indication information is used to indicate the interval between two adjacent reserved resources in the time domain, and / or the interval between two adjacent reserved resources in the frequency domain.

[0063] In a fourth aspect, a communication device is provided for implementing the method described in the second aspect. The communication device may be the first communication device described in the second aspect, or a device including the first communication device, or a device included in the first communication device, such as a chip.

[0064] The communication device includes a module, unit, or means corresponding to the above method, which can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0065] In combination with the above-mentioned fourth aspect, in a possible design, the device includes a transceiver module and a processing module; the processing module is used to determine the first control information; the first control information is used to indicate the number of repeated transmissions of the first feedback information and the first reserved resource; the number of repeated transmissions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate the decoding result of the message BMsgB or the message 4Msg4; the first reserved resource is one of the one or more reserved resources; the number of the one or more reserved resources is the same as the number of repeated transmissions of the first feedback information; each of the one or more reserved resources is used for the transmission of the first feedback information once; the transceiver module is used to send the first control information.

[0066] In combination with the above-mentioned fourth aspect, in a possible design, the transceiver module is also used to send MsgB or Msg4; and receive the first feedback information through one or more reserved resources.

[0067] In combination with the fourth aspect above, in a possible design, the transceiver module is also used to receive first indication information; the first indication information is used to indicate the ability to repeatedly send first feedback information.

[0068] In combination with the above-mentioned fourth aspect, in a possible design, the transceiver module is also used to receive second indication information; the second indication information is used to indicate a request to repeat sending the first feedback information.

[0069] In combination with the above-mentioned fourth aspect, in a possible design, the second indication information is used to indicate a request to repeatedly send the first feedback information, including: the second indication information is used to indicate the number of times a request is repeatedly sent to send the first feedback information.

[0070] In combination with the above-mentioned fourth aspect, in a possible design, the first control information includes third indication information; the third indication information is used to determine the first index and the second index, the first index is the index corresponding to the first resource, and the second index is the index corresponding to the first reserved resource; the number of repeated transmissions of the first feedback information is the same as the number of symbols of the first resource.

[0071] In combination with the above-mentioned fourth aspect, in a possible design, the first control information includes fourth indication information and fifth indication information; the fourth indication information is used to indicate the number of repeated sending times of the first feedback information, and the fifth indication information is used to indicate the first reserved resources.

[0072] In combination with the above-mentioned fourth aspect, in a possible design, the transceiver module is also used to send sixth indication information; the sixth indication information is used to indicate the number of repeated sendings of one or more candidates; the fourth indication information is used to indicate the number of repeated sendings of the first feedback information, including: the fourth indication information is an index corresponding to the number of repeated sendings of the first feedback information in one or more candidate repeated sendings.

[0073] In combination with the fourth aspect above, in one possible design, the size of each reserved resource is the same.

[0074] In combination with the above-mentioned fourth aspect, in a possible design, among multiple reserved resources, a positional relationship between the reserved resources other than the first reserved resource and the first reserved resource in the time domain and / or frequency domain corresponds to the number of repeated transmissions of the first feedback information.

[0075] In combination with the above-mentioned fourth aspect, in a possible design, the transceiver module is also used to send seventh indication information; the seventh indication information is used to indicate the correspondence between the position relationship and the number of repeated sending times of the first feedback information.

[0076] In combination with the fourth aspect, in a possible design, the multiple reserved resources satisfy at least one of the following relationships:

[0077] Among the multiple reserved resources, two reserved resources that are adjacent in the time domain are continuous in the time domain;

[0078] Among the multiple reserved resources, two adjacent reserved resources in the frequency domain are continuous in the frequency domain;

[0079] Among the multiple reserved resources, the interval between two adjacent reserved resources in the time domain is the same;

[0080] Among the multiple reserved resources, the interval between two adjacent reserved resources in the frequency domain is the same.

[0081] In combination with the above-mentioned fourth aspect, in a possible design, the transceiver module is also used to send an eighth indication information; the eighth indication information is used to indicate the interval between two adjacent reserved resources in the time domain, and / or the interval between two adjacent reserved resources in the frequency domain.

[0082] In a fifth aspect, a communication device is provided, comprising: a processor, the processor being used to execute instructions stored in a memory, and when the processor executes the instructions, the communication device executes the method described in any one of the above aspects. The communication device may be the second communication device in the above first aspect. Alternatively, the communication device may be the first communication device in the above second aspect.

[0083] In a possible design, the communication device further includes a memory for storing computer instructions. Optionally, the processor and the memory are integrated together, or the processor and the memory are separately provided.

[0084] In one possible design, the memory is coupled to the processor and is outside the communication device.

[0085] In a sixth aspect, a communication device is provided, comprising: a processor and an interface circuit, the interface circuit being used to communicate with a module outside the communication device; the processor being used to execute the method described in any one of the above aspects through a logic circuit or by running a computer program or instruction. The communication device may be the second communication device in the above first aspect. Alternatively, the communication device may be the first communication device in the above second aspect.

[0086] Alternatively, the interface circuit can be a code / data read / write interface circuit, which is used to receive computer execution instructions (the computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor so that the processor runs the computer execution instructions to execute the method described in any of the above aspects.

[0087] In some possible designs, the communication device may be a chip or a chip system.

[0088] In the seventh aspect, the present application provides a computer-readable storage medium, which stores instructions. When the instructions are executed, the random access method performed by the second communication device in the above-mentioned first aspect or a possible design of the first aspect is executed, or, when the instructions are executed, the random access method performed by the first communication device in the above-mentioned second aspect or a possible design of the second aspect is executed.

[0089] In an eighth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the random access method executed by the second communication device in the above-mentioned first aspect or a possible design of the first aspect, or enables the computer to execute the above-mentioned second aspect or a random access method executed by the first communication device in a possible design of the second aspect.

[0090] In a ninth aspect, a communication device is provided (for example, the communication device may be a chip or a chip system), the communication device including a processor for implementing the functions involved in any of the above aspects. In one possible design, the communication device also includes a memory for storing necessary program instructions and data. When the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.

[0091] In a tenth aspect, a communication system is provided, the communication system comprising a first communication device and a second communication device, wherein the second communication device is used to implement the method described in the first aspect, and the second communication device is used to implement the method described in the second aspect.

[0092] Among them, the technical effects brought about by any design method in the third aspect to the tenth aspect can refer to the technical effects brought about by the different design methods in the above-mentioned first aspect to the second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] Figure 1 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0094] Figure 2 A schematic diagram of a satellite communication network architecture provided in an embodiment of the present application;

[0095] Figure 3 A schematic diagram of the structure of a terminal device and a network device provided in an embodiment of the present application;

[0096] Figure 4 A schematic diagram of the structure of another terminal device provided in an embodiment of the present application;

[0097] Figure 5 An interactive schematic diagram of a random access method provided in an embodiment of the present application;

[0098] Figure 6 A schematic diagram of a positional relationship between multiple reserved resources provided in an embodiment of the present application;

[0099] Figure 7 A schematic diagram of another positional relationship between multiple reserved resources provided in an embodiment of the present application;

[0100] Figure 8 A schematic diagram of another positional relationship between multiple reserved resources provided in an embodiment of the present application;

[0101] Fig. 9 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0102] Due to the limited capabilities of terminal devices, the current focus of coverage enhancement is uplink communication. In the random access process of terrestrial communications, in order to achieve uplink coverage enhancement, the repeated transmission of message 3 (message3, Msg3) is introduced. However, for the positive feedback (acknowledgement, ACK) / negative feedback (negative acknowledgement, NACK) corresponding to message 4 (message4, Msg4) / message B (messageB, MsgB), since the link budget is sufficient for decoding, no corresponding retransmission mechanism is introduced. Among them, ACK / NACK is carried by the physical uplink control channel (physical uplink control channel, PUCCH).

[0103] In order to achieve further coverage enhancement, it is necessary to enhance the coverage of the PUCCH carrying ACK / NACK corresponding to Msg4 / MsgB in the satellite communication scenario. This application proposes a method for achieving this type of coverage enhancement. It should be noted that the solution in this application can also be applied to terrestrial communications, and can be used to enhance the coverage of the PUCCH carrying ACK / NACK corresponding to Msg4 / MsgB on the ground.

[0104] In order to facilitate understanding of the technical solutions of the embodiments of the present application, a brief introduction to the related technologies of the present application is first given as follows.

[0105] 1. Random access:

[0106] Terminal devices can complete uplink synchronization through random access, which is an important part of communication.

[0107] On the one hand, random access can be divided into contention based random access procedure (CBRA) and contention-free random access (CFRA) depending on whether competition is required. The contention-based random access procedure means that the network device does not allocate a dedicated preamble and physical random access channel (PRACH) resources to the terminal device, but the terminal device randomly selects a preamble within a specified range and initiates random access. The non-contention-based random access procedure means that the terminal device initiates random access using a specified preamble on a specified PRACH resource according to the instructions of the network device.

[0108] On the other hand, according to the different steps of interactive information, random access can be divided into four-step random access (4-step random access channel, 4-step RACH) and two-step random access (2-step random access channel, 2-step RACH). Two-step random access combines the steps of interactive information in four-step random access, reducing the steps and time required for the random access process compared to four-step random access.

[0109] The following introduces contention-based four-step random access (CBRA with 4-step RA), which includes the following steps:

[0110] Step 1: The terminal device sends a preamble to the network device on the PRACH resource, which is also called sending message 1 (Msg1). The preamble and PRACH resource are determined by the terminal device according to the system information broadcast by the network device.

[0111] Step 2: After receiving Msg1 sent by the terminal device, the network device sends message 2 (message 2, Msg2) to the terminal device according to the random access preamble sent by the terminal device. Msg2 is also called a random access response (RAR) message, which is the response of the network device to the received Msg1. Msg 2 includes the time-frequency resource location, modulation and coding mode and other configuration information used by the terminal device to send Msg3.

[0112] Step 3: After receiving Msg2, the terminal device sends message 3 (message 3, Msg3) to the network device in the corresponding time-frequency resources according to the configuration information in Msg2. Msg3 is used for contention resolution. Its transmission content is a high-level message with unfixed content. If multiple different terminal devices use the same random access preamble for random access, Msg3 and Msg4 can jointly determine whether there is a conflict.

[0113] Step 4: After receiving Msg3, the network device replies with message 4 (message 4, Msg4) to the terminal device. The information content included in Msg4 is not fixed and needs to correspond to the information content included in Msg3 to be used together for contention resolution. For example, assuming that Msg3 sent by the terminal device includes a cell-radio network temporary identifier (C-RNTI), correspondingly, if the terminal device detects the C-RNTI sent in Msg3 in Msg4, it is considered that the contention for random access is successful and the next communication process continues.

[0114] The following introduces contention-based two-step random access (CBRA with 2-step RA), which includes the following steps:

[0115] Step 1: The terminal device sends a preamble and a physical uplink shared channel (PUSCH) payload to the network device, which is also called sending message A (MsgA).

[0116] Step 2: The network device sends message B (message B, MsgB) to the terminal device. MsgB is a contention resolution message in response to MsgA.

[0117] Among them, MsgA assumes the functions of Msg1 and Msg3 in the contention-based four-step random access, and MsgB assumes the functions of Msg2 and Msg4 in the contention-based four-step random access.

[0118] The following introduces non-contention-based four-step random access (CFRA with 4-step RA), which includes the following steps:

[0119] Step 1: The terminal device sends a preamble code, namely Msg1, to the network device, wherein the preamble code is allocated to the terminal device by the network device.

[0120] Step 2: The network device sends a response message of Msg1, namely Msg2, to the terminal device.

[0121] The following introduces non-contention-based two-step random access (CFRA with 2-step RA), which includes the following steps:

[0122] Step 1: The terminal device sends MsgA to the network device, where the preamble and PUSCH payload are allocated to the terminal device by the network device.

[0123] Step 2: The network device sends MsgB to the terminal device, where MsgB is a response message of MsgA.

[0124] In the above-mentioned various random access processes, after the network device sends Msg4 or MsgB to the terminal device, the terminal device needs to send feedback information of Msg4 or MsgB to the network device to feedback the decoding result of Msg4 or MsgB. For example, the terminal device can send ACK to the network device to indicate successful decoding, or can send NACK to the network device to indicate failed decoding.

[0125] Among them, the feedback information of Msg4 or MsgB is carried by PUCCH. The PUCCH resources used to send the feedback information of Msg4 are indicated by the physical downlink control channel (PDCCH) that schedules Msg4. Specifically, the PDCCH used to schedule Msg4 will indicate an index. After the terminal device receives the PDCCH that schedules Msg4, it calculates another index based on the index indicated therein and a set of calculation methods defined by the protocol, and uses the other index obtained as the index corresponding to the PUCCH resource in Table 1 below, thereby sending the feedback information of Msg4 through the PUCCH resource corresponding to the index.

[0126] Table 1

[0127]

[0128] in, Indicates the size of the random access portion of the bandwidth.

[0129] Similarly, in the above-mentioned scheme for determining the PUCCH resources for sending feedback information of Msg4, Msg4 is replaced by MsgB, that is, the scheme for determining the PUCCH resources for sending feedback information of MsgB.

[0130] 2. Satellite Communications

[0131] Satellite communication is an important communication scenario in the 5th-Generation (5G) and future communication systems. Compared with terrestrial communication, satellite communication has a wider coverage, longer communication distance, and greater path loss, while the transmission power and number of antennas of terminal devices on the ground are limited. Therefore, the link budget between the terminal devices on the ground and the base stations deployed on the satellite (which can be referred to as satellite base stations) is low. Based on this, further coverage enhancement is needed to achieve direct connection between terminal devices on the ground and satellite base stations.

[0132] Due to the limited capabilities of terminal devices, the current focus of coverage enhancement is on uplink communications. In the random access of terrestrial communications, repeated transmission of Msg3 is introduced to achieve uplink coverage enhancement. However, for the feedback information of Msg4 or MsgB, since the link budget is sufficient for decoding, no corresponding retransmission mechanism is introduced.

[0133] In order to achieve further coverage enhancement, it is necessary to enhance the coverage of the PUCCH carrying the feedback information of Msg4 or MsgB in the satellite communication scenario. However, there is currently no design solution to enhance the channel. The embodiments of the present application provide a random access method, device and system for solving the coverage problem of the channel carrying the feedback information of Msg4 or MsgB and enhancing the channel.

[0134] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. And, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the differences. At the same time, in the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0135] The technical solution of the embodiment of the present application can be used for various communication systems, and the communication system can be a third generation partnership project (3GPP) communication system, for example, a long term evolution (LTE) system, a 5G system, an Internet of Things (IoT) system, a non-terrestrial network (NTN) system, a vehicle to everything (V2X) system, or a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, or other similar new systems for the future, such as the sixth generation (6G) system, which is not specifically limited in the embodiment of the present application. In addition, the term "system" can be interchangeable with "network".

[0136] It should be noted that the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0137] like Figure 1 As shown, a communication system 10 provided in an embodiment of the present application is provided. The communication system 10 includes a first communication device 20 and a second communication device 30. The first communication device 20 can communicate with the second communication device 30 in a wireless manner.

[0138] Understandably, Figure 1 It is only a schematic diagram and does not limit the number of the first communication device 20 or the second communication device 30 in the communication system 10 . The communication system 10 may include at least one first communication device 20 and at least one second communication device 30 .

[0139] Optionally, different first communication devices 20 can communicate with each other. Optionally, different second communication devices 30 can communicate with each other. The first communication device 20 and / or the second communication device 30 can be fixed or movable.

[0140] Optionally, the first communication device 20 and the second communication device 30 in the embodiment of the present application can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; can also be deployed on an airplane, balloon, or artificial satellite in the air. The embodiment of the present application does not limit the application scenarios of the first communication device 20 and the second communication device 30.

[0141] Optionally, the first communication device 20 and the second communication device 30 in the embodiment of the present application can communicate through an authorized spectrum, or can communicate through an unlicensed spectrum, or can communicate through both the authorized spectrum and the unlicensed spectrum. The first communication device and the second communication device can communicate through a spectrum below 6 gigahertz (GHz), or can communicate through a spectrum above 6 GHz, or can use a spectrum below 6 GHz and a spectrum above 6 GHz at the same time. The embodiment of the present application does not limit the spectrum resources used between the first communication device 20 and the second communication device 30.

[0142] Optionally, the first communication device 20 or the second communication device 30 in the embodiment of the present application may be a general device or a dedicated device, and the embodiment of the present application does not specifically limit this.

[0143] Optionally, the first communication device 20 and the second communication device 30 may be different types of devices. For example, one of the first communication device 20 and the second communication device 30 is a network device, and the other is a terminal device.

[0144] Optionally, the network device in the embodiment of the present application is a device that connects a terminal device to a wireless network. The network device in the embodiment of the present application may include various forms of base stations, for example, a macro base station, a micro base station (also called a small station), a relay station, an access point, a transmitting point (TP), an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5G mobile communication system, a device that implements the base station function in a communication system that evolves after 5G, a mobile switching center, and a device that performs the base station function in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, etc.; it may also be a network device in an NTN communication system, that is, it may be deployed on a high-altitude platform or a satellite; it may also be a module or unit that completes part of the functions of a base station, for example, it may be a centralized unit (CU) in a cloud radio access network (C-RAN) system, or it may be a distributed unit (DU). The embodiments of the present application do not limit the specific technology and specific device form used by the network device. All or part of the functions of the network device can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). In this application, unless otherwise specified, the network device refers to the radio access network (RAN) device.

[0145] Optionally, the terminal device in the embodiment of the present application may be a device with wireless transceiver function, which may also be referred to as a terminal. The terminal device may specifically refer to user equipment (UE), access terminal, subscriber unit, user station, mobile station, customer-premises equipment (CPE), remote station, remote terminal, mobile device, mobile terminal, user terminal, wireless communication device, user agent or user device, etc. The terminal device may also be a satellite phone, a cellular phone, a smart phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless data card, a wireless modem, a tablet computer, a computer with wireless transceiver function, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a communication device carried on a high-altitude aircraft, a wearable device, a drone, a robot, a smart point of sale (POS) machine, a machine type communication device, a terminal device in D2D, a vehicle-mounted terminal device in V2X, an on-board unit (OBU), a vehicle-mounted communication terminal (telematics box, T-box), a vehicle or a road side unit (RSU), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a remote medical device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical care ... The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device. For example, the terminal device may also be a chip or a module. All or part of the functions of the terminal device may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform).

[0146] by Figure 1 Taking the interaction between the first communication device 20 and the second communication device 30 shown as an example, in the random access method provided in the embodiment of the present application, the first communication device 20 determines the first control information, and the first control information is used to indicate the number of repeated transmissions of the first feedback information and the first reserved resource. Among them, the number of repeated transmissions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate the decoding result of MsgB or Msg4; the first reserved resource is one of the one or more reserved resources; the number of one or more reserved resources is the same as the number of repeated transmissions of the first feedback information; each of the one or more reserved resources is used to send the first feedback information once. The first communication device 20 sends the first control information to the second communication device 30. After receiving the first control information, the second communication device 30 determines one or more reserved resources according to the first control information. The specific implementation and technical effects of this scheme will be described in detail in the subsequent method embodiments, and will not be repeated here.

[0147] Optional, Figure 1 The communication system 10 shown may be applied in a satellite communication network architecture. Figure 2 is a schematic diagram of the architecture of an exemplary satellite communication network suitable for the communication system 10.

[0148] exist Figure 2 In the network architecture shown, the terminal equipment on the ground accesses the network through an air interface (the air interface can be various types of air interfaces, such as a 5G air interface). Figure 2 As shown in (a) and (b) in the figure, the base station can be deployed on the satellite or on the ground. The satellite can be connected to the ground station via a wireless link. The base station deployed on the ground can be connected to the ground station to communicate with the satellite. The ground station or the base station deployed on the ground can be connected to the core network by wire or wireless means. There can be a wireless link between satellites. If the satellite only has the transparent forwarding function (that is, the corresponding base station is deployed on the ground), only transparent forwarding can be achieved between satellites. If the base station or part of the base station function is deployed on the satellite, the satellites can complete the signaling interaction and user data transmission between base stations, such as Figure 2 As shown in (c) in . Figure 2 The description of each network element and the interfaces between them are as follows:

[0149] Terminal equipment: including mobile devices that support the new air interface, such as mobile phones, pads and other mobile devices, which can access the satellite network through the air interface and initiate calls, surf the Internet and other services.

[0150] Base station: mainly provides wireless access services, dispatches wireless resources to access terminal devices, provides reliable wireless transmission protocols and data encryption protocols, etc.

[0151] Core network: responsible for user access control, mobility management, session management, user authentication, billing and other services. It consists of multiple functional units and can be divided into control plane and data plane functional entities.

[0152] Ground station: responsible for forwarding signaling and business data between base stations deployed on satellites and the core network.

[0153] Air interface: The wireless link between the terminal device and the base station.

[0154] Xn interface: The interface between base stations, mainly used for signaling interaction such as switching.

[0155] NG interface: The interface between the base station and the core network, which mainly interacts with the core network's non-access stratum (NAS) signaling and user service data.

[0156] It should be noted that Figure 2 The Xn interface and NG interface in are interfaces in the 5G communication system. Figure 2 The network architecture shown is applied in a 4th-Generation (4G) communication system, in which the Xn interface is called the X2 interface and the NG interface is the S1 interface.

[0157] in, Figure 2 The terminal device in the communication system 10 may be the second communication device 30, Figure 2 The base station in can be the first communication device 20 in the communication system 10.

[0158] Optional, if Figure 1 The first communication device 20 in the embodiment is a network device. The first communication device 20 may be implemented as follows: Figure 3 The structure of the network device shown in Figure 1. Figure 1 The second communication device 30 in the embodiment is a terminal device. The second communication device 30 may be implemented as follows: Figure 3 The structure of the terminal device shown.

[0159] The terminal device includes at least one processor 401 and at least one transceiver 403 (also referred to as a communication interface 403 ). Optionally, the terminal device may also include at least one memory 402 , at least one output device 404 , or at least one input device 405 .

[0160] Processor 401, memory 402 and transceiver 403 are connected via a communication line. The communication line may include a path to transmit information between the above components.

[0161] Processor 401 may be a general-purpose central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor. In a specific implementation, as an embodiment, processor 401 may also include multiple CPUs, and processor 401 may be a single-core processor or a multi-core processor. The processor here may refer to one or more devices, circuits or processing cores for processing data.

[0162] The memory 402 may be a device with a storage function. For example, it may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory 402 may exist independently and be connected to the processor 401 through a communication line. The memory 402 may also be integrated with the processor 401.

[0163] The memory 402 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 401. Specifically, the processor 401 is used to execute the computer-executable instructions stored in the memory 402, thereby implementing the random access method described in the embodiment of the present application.

[0164] Alternatively, optionally, in an embodiment of the present application, the processor 401 may also perform processing-related functions in the random access method provided in the following embodiments of the present application, and the transceiver 403 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiments of the present application.

[0165] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code or computer program code, which is not specifically limited in the embodiments of the present application.

[0166] The transceiver 403 may be any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, wireless access network, or wireless local area network (WLAN), etc. The transceiver 403 includes a transmitter (Tx) and a receiver (Rx).

[0167] The output device 404 communicates with the processor 401 and can display information in a variety of ways. For example, the output device 404 can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector.

[0168] The input device 405 communicates with the processor 401 and can accept user input in various ways. For example, the input device 405 can be a mouse, a keyboard, a touch screen device, or a sensor device.

[0169] The network device includes at least one processor 301, at least one transceiver 303 (also referred to as a communication interface 303), and at least one network interface 304. Optionally, the network device may also include at least one memory 302. The processor 301, the memory 302, the transceiver 303, and the network interface 304 are connected via a communication line. The network interface 304 is used to connect to a core network device via a link (e.g., an S1 interface), or to connect to a network interface of other network devices via a wired or wireless link (e.g., an X2 interface). Figure 3 In addition, the description of the processor 301, the memory 302 and the transceiver 303 may refer to the description of the processor 401, the memory 402 and the transceiver 403 in the terminal device, which will not be repeated here.

[0170] Combination Figure 3 The schematic diagram of the structure of the terminal device shown is exemplary. Figure 4A specific structural form of the terminal device provided in the embodiment of the present application.

[0171] Wherein, in some embodiments, Figure 3 The functions of the processor 401 can be Figure 4 The processor 410 in is implemented.

[0172] In some embodiments, Figure 3 The function of the transceiver 403 can be achieved by Figure 4 The antenna 1, antenna 2, mobile communication module 450, wireless communication module 460, etc. in the embodiment are implemented. The mobile communication module 450 can provide solutions for wireless communication technologies including LTE, NR or future mobile communication applied on the terminal device. The wireless communication module 460 can provide solutions for wireless communication technologies including WLAN (such as Wi-Fi network), Bluetooth (blue tooth, BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication (near field communication, NFC), infrared, etc. applied on the terminal device. In some embodiments, the antenna 1 of the terminal device is coupled to the mobile communication module 450, and the antenna 2 is coupled to the wireless communication module 460, so that the terminal device can communicate with the network and other devices through wireless communication technology.

[0173] In some embodiments, Figure 3 The function of the memory 402 can be achieved by Figure 4 It can be implemented by the internal memory 421 or the external memory connected to the external memory interface 420.

[0174] In some embodiments, Figure 3 The output device 404 in the function can be Figure 4 The display screen 494 is implemented in.

[0175] In some embodiments, Figure 3 The function of the input device 405 can be realized by a mouse, keyboard, touch screen device or Figure 4 This is achieved by the sensor module 480 in.

[0176] In some embodiments, Figure 4As shown, the terminal device may also include one or more of an audio module 470, a camera 493, a button 490, a subscriber identity module (SIM) card interface 495, a universal serial bus (USB) interface 430, a charging management module 440, a power management module 441 and a battery 442.

[0177] Understandably, Figure 4 The structure shown does not constitute a specific limitation on the terminal device. For example, in other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0178] The following will be combined Figures 1 to 4 ,by Figure 1 Taking the interaction between the first communication device 20 and any second communication device 30 as an example, the random access method provided in the embodiment of the present application is described in detail.

[0179] It should be noted that the message names between network elements or the names of parameters in the messages in the following embodiments of the present application are merely examples, and other names may be used in specific implementations, and the embodiments of the present application do not impose any specific limitations on this.

[0180] like Figure 5 As shown, a random access method provided in an embodiment of the present application is provided. Figure 5 In the example, the first communication device and the second communication device are used as the execution subjects of the interaction indication to illustrate the method, but the present application does not limit the execution subjects of the interaction indication. Figure 5 The first communication device in the method may also be a chip, a chip system, or a processor that supports the communication device to implement the method, or may be a logic module or software that can implement all or part of the functions of the first communication device; Figure 5 The second communication device in the random access method may also be a chip, a chip system, or a processor that supports the communication device to implement the method, or may be a logic module or software that can implement all or part of the functions of the second communication device. The random access method includes steps S501-S503:

[0181] S501. A first communication device determines first control information, where the first control information is used to indicate the number of repetitions of first feedback information and a first reserved resource. The number of repetitions of the first feedback information is greater than or equal to 1; the first feedback information is used to indicate a decoding result of MsgB or Msg4; the first reserved resource is one of the one or more reserved resources; the number of the one or more reserved resources is the same as the number of repetitions of the first feedback information; each of the one or more reserved resources is used for the transmission of the first feedback information once.

[0182] S502: The first communication device sends first control information to the second communication device, and correspondingly, the second communication device receives the first control information.

[0183] S503: The second communication device determines one or more reserved resources according to the first control information.

[0184] Based on the random access method provided in the embodiment of the present application, the second communication device can determine the number of repeated transmissions of the first feedback information and the reserved resources for sending the first feedback information according to the first control information, thereby achieving repeated transmission of the first feedback information, and can enhance the coverage of the channel carrying the first feedback information, that is, the channel carrying the feedback information of the downlink signal during the random access process.

[0185] In S501, the first communication device determines the first control information, which can also be referred to as the first communication device obtaining the first control information or the first communication device generating the first control information. The first control information is used to indicate the number of repetitions of the first feedback information and the first reserved resources. The first feedback information and the first reserved resources are introduced in detail below.

[0186] In an embodiment of the present application, the first feedback information is feedback information of a downlink signal during a random access process, and can indicate a decoding result of a downlink signal during a random access process. Exemplarily, in a two-step random access scenario, the first feedback information can be used to indicate a decoding result of MsgB. In a four-step random access scenario, the first feedback information can be used to indicate a decoding result of Msg4.

[0187] Further, if the random access process introduces other downlink signals, the first feedback information may also be feedback information of the other downlink signals, used to indicate the decoding results of the other downlink signals. For example, assuming that the introduced downlink signals are called Msg5, Msg6, Msg7 or Msg8, etc., the first feedback information may also be used to indicate the feedback results of the downlink signals such as Msg5, Msg6, Msg7 or Msg8.

[0188] For ease of introduction, the random access method provided in the embodiment of the present application is applied to a two-step random access scenario or a four-step random access scenario to expand the introduction of the random access method provided in the embodiment of the present application. It can be understood that if other new random access forms appear, the random access method provided in the embodiment of the present application can also be applied to the new random access scenario. Msg1 / Msg3 / MsgA appearing below can be replaced with other uplink information in other random access scenarios, and MsgB / Msg4 appearing below can be replaced with other downlink information in other random access scenarios.

[0189] Optionally, the first feedback information may indicate that MsgB or Msg4 is decoded successfully, or may indicate that MsgB or Msg4 is decoded unsuccessfully. Exemplarily, the first feedback information may be an ACK indicating that decoding is successful, or a NACK indicating that decoding is unsuccessful.

[0190] In the embodiment of the present application, the first feedback information may be sent by the second communication device to the first communication device. Before the second communication device sends the first feedback information to the first communication device, the first communication device may indicate the number of repeated transmissions of the first feedback information by sending the first control information to the first communication device. The number of repeated transmissions of the first feedback information indicated by the first communication device through the first control information may be understood as the number of first feedback information that the first communication device expects to receive from the second communication device.

[0191] The number of times the first feedback information is repeatedly sent indicated by the first control information may be greater than or equal to 1.

[0192] The following introduces several specific implementation methods provided in an embodiment of the present application, in which the first communication device determines the number of repeated transmissions of the first feedback information indicated by the first control information.

[0193] Implementation method 1: The first communication device may determine the number of repeated transmissions of the first feedback information indicated by the first control information according to a signal received from the second communication device.

[0194] In this implementation, the first communication device may determine the number of repetitions of the first feedback information indicated by the first control information based on parameters such as the quality / strength of the signal from the second communication device. Wherein, if the value of the signal parameter is higher, it means that the quality of the channel used by the second communication device to send the signal to the first communication device is better, and the first communication device may determine a lower number of repetitions of the first feedback information when the value of the signal parameter is higher. If the value of the signal parameter is higher, it means that the quality of the channel used by the second communication device to send the signal to the first communication device is worse, and the first communication device may determine a higher number of repetitions of the first feedback information when the value of the signal parameter is higher.

[0195] Optionally, the first communication device can establish a mapping relationship between the number of repeated transmissions of the first feedback information and the value of the signal parameter (or the interval in which the value of the signal parameter is located), thereby determining the number of repeated transmissions of the first feedback information indicated by the first control information based on the value of the parameter of the signal from the second communication device.

[0196] Exemplarily, assuming that the signal parameter is signal quality, in a two-step random access scenario, the first communication device may determine the number of repeated transmissions of the first feedback information indicated in the first control information based on the signal quality of MsgA from the second communication device. In a four-step random access scenario, the first communication device may determine the number of repeated transmissions of the first feedback information indicated in the first control information based on the signal quality of Msg1 and / or Msg3 from the second communication device. Specifically, if the quality of the signal sent by the second communication device to the first communication device is good, the first communication device may determine a smaller number of repeated transmissions of the first feedback information. If the quality of the signal sent by the second communication device to the first communication device is poor, the first communication device may determine a larger number of repeated transmissions of the first feedback information.

[0197] Implementation method 2: The first communication device may determine the number of times the first feedback information is repeatedly sent indicated by the first control information according to the capability of the second communication device to repeatedly send the first feedback information.

[0198] Based on this solution, the second communication device can indicate its ability to repeatedly send the first feedback information, so that the first communication device can indicate an appropriate number of repeated transmissions of the first feedback information according to the capability of the second communication device.

[0199] Optionally, before the first communication device sends the first control information to the second communication device, the second communication device may send first indication information to the first communication device; the first indication information is used to indicate the ability of the second communication device to repeatedly send the first feedback information. The first communication device determines the ability of the second communication device to repeatedly send the first feedback information based on the received first indication information, and determines the number of repeated transmissions of the first feedback information indicated by the first control information based on the ability of the second communication device to repeatedly send the first feedback information.

[0200] In one possible implementation, the first indication information may indicate whether the second communication device has the ability to repeatedly send the first feedback information multiple times or not. If the first communication device determines, based on the first indication information, that the second communication device has the ability to repeatedly send the first feedback information multiple times, the first communication device determines that the number of repeated transmissions of the first feedback information indicated by the first control information may be greater than or equal to 2. If the first communication device determines, based on the first indication information, that the second communication device does not have the ability to repeatedly send the first feedback information multiple times, the first communication device determines that the number of repeated transmissions of the first feedback information indicated by the first control information may be equal to 1.

[0201] For example, the first indication information may be a 1-bit field. When the bit value is 1, it indicates that the second communication device has the ability to repeatedly send the first feedback information multiple times. When the bit value is 2, it indicates that the second communication device does not have the ability to repeatedly send the first feedback information multiple times.

[0202] In another possible implementation, the first indication information may indicate one or more times of repeating the first feedback information supported by the second communication device. Alternatively, the first indication information may indicate the maximum number of times the second communication device supports repeating the first feedback information (or, indicate the maximum number of times the second communication device supports repeating the first feedback information). Correspondingly, the first communication device may select one from the one or more times of repeating the first feedback information supported by the second communication device according to the first indication information, as the number of times the first feedback information is repeated as indicated by the first control information. Alternatively, the first communication device may determine a value that does not exceed the maximum number of times the second communication device supports repeating the first feedback information according to the first indication information, as the number of times the first feedback information is repeated as indicated by the first control information.

[0203] For example, assuming that the first indication information indicates that the second communication device supports repeated transmission of the first feedback information 2 times, 4 times, and 8 times, the first communication device may determine 4 times as the number of repeated transmissions of the first feedback information indicated by the first control information according to the first indication information. For another example, assuming that the first indication information indicates that the second communication device supports repeated transmission of the first feedback information up to 8 times, the first communication device may determine that the number of repeated transmissions of the first feedback information indicated by the first control information cannot exceed 8 times according to the first indication information.

[0204] Implementation method three: the first communication device may determine the number of repeated transmissions of the first feedback information indicated by the first control information according to the request of the second communication device to repeatedly transmit the first feedback information.

[0205] Based on this solution, the second communication device may request the first communication device to repeatedly send the first feedback information, so that the first communication device determines that the second communication device may repeatedly send the first feedback information.

[0206] In this implementation, before the first communication device sends the first control information to the second communication device, the second communication device may send the second indication information to the first communication device; the second indication information is used to indicate that the second communication device requests to repeatedly send the first feedback information. Optionally, the second indication information may indicate that the second communication device requests to repeatedly send the first feedback information multiple times. The first communication device may determine, based on the second indication information, that the second communication device requests to repeatedly send the first feedback information multiple times, thereby determining that the number of repeated transmissions of the first feedback information indicated by the first control information may be greater than or equal to 2.

[0207] For example, the second indication information may be a specific field carried in a message sent by the second communication device to the first communication device. After receiving the message, if the first communication device determines that the message contains the specific field, it determines that the second communication device requests to repeatedly send the first feedback information multiple times.

[0208] Alternatively, the second indication information may indicate the number of times the second communication device requests to repeatedly send the first feedback information (or referred to as the number of times the second indication information requests to repeatedly send the first feedback information). The number of times the second indication information requests to repeatedly send the first feedback information may be understood as the number of times the second communication device expects to repeatedly send the first feedback information. The first communication device may determine the number of times the first feedback information is repeatedly sent as indicated by the first control information based on the number of times the second indication information requests to repeatedly send the first feedback information.

[0209] For example, assuming that the second indication information indicates that the second communication device requests to repeatedly send the first feedback information twice, the first communication device may determine 2 as the number of repeated transmissions of the first feedback information indicated by the first control information according to the second indication information.

[0210] Optionally, in a two-step random access scenario, the first indication information or the second indication information may be carried in MsgA sent from the second communication device to the first communication device. In a four-step random access scenario, the first indication information or the second indication information may be carried in Msg3 sent from the second communication device to the first communication device.

[0211] At present, the way for a terminal device to request repeated sending of Msg3 is to indicate it through the selection of the preamble code resources or preamble code used for sending. The network side can know whether the terminal device requests to repeat sending of Msg3 through the received preamble code or the resources of the received preamble code. However, this method requires different resources or preamble codes to distinguish terminal devices that request or do not request repeated sending of Msg3. In the case of the same total resources or available preamble codes, the capacity of random access will decrease. Based on this defect, in an embodiment of the present application, the second communication device can use MsgA / Msg3 to inform the first communication device that it can repeatedly send the first feedback information, which will not occupy the preamble code resources or preamble code, and will not cause a decrease in the capacity of random access.

[0212] Optionally, the above implementation method 1 can be applied in combination with the above implementation method 2 or implementation method 3. For example, assuming that in a four-step random access scenario, the Msg3 sent by the second communication device to the first communication device includes the first indication information, and the first indication information indicates that the second communication device supports repeated transmission of the first feedback information 2 times, 4 times and 8 times. After the first communication device receives Msg3, it is determined that the signal quality of Msg3 is poor, and the first communication device can select the maximum 8 times from 2 times, 4 times and 8 times as the number of repeated transmissions of the first feedback information indicated by the first control information. For another example, assuming that in a four-step random access scenario, the Msg3 sent by the second communication device to the first communication device includes the second indication information, and the second indication information indicates that the second communication device requests to repeat the transmission of the first feedback information 4 times. After the first communication device receives Msg3, it is determined that the signal quality of Msg3 is poor. It is inferred that if the first feedback information is received 4 times, it is not enough to successfully decode the first feedback information. Then the first communication device can determine the number of repeated transmissions of the first feedback information indicated by the first control information to be 6 times, 8 times or 10 times, etc., which is more than 4 times. For another example, assuming that in a two-step random access scenario, the second communication device sends a second indication information to the first communication device in an MsgA, and the second indication information indicates that the second communication device requests to repeatedly send the first feedback information multiple times. After the first communication device receives the MsgA, it determines that the signal quality of the MsgA is good, and it is inferred that receiving the first feedback information once is sufficient to decode the first feedback information. Then, the first communication device can determine the number of repeated transmissions of the first feedback information indicated by the first control information to be 1 time.

[0213] Optionally, the number of times the first feedback information is repeatedly sent indicated by the first indication information or the second indication information may be determined by the second communication device according to the sixth indication information sent by the first communication device. The sixth indication information is used to indicate one or more candidate repeated sending times. After receiving the sixth indication information, the second communication device may select one or more candidate repeated sending times from one or more candidate repeated sending times as the number of times the first feedback information is repeatedly sent indicated by the first indication information or the second indication information.

[0214] Optionally, the sixth indication information may be carried in a system information (system information) broadcast by the first communication device, such as system information block 1 (system information block 1, SIB1).

[0215] In a possible implementation, after the second communication device receives the sixth indication information, the first indication information or the second indication information may be used to indicate the indexes corresponding to the number of times the selected one or more candidate repeated transmissions are respectively sent. It should be noted that this implementation does not constitute a limitation on the first indication information or the second indication information. When the second communication device receives the sixth indication information, the first indication information or the second indication information may also directly indicate the numerical value of the number of times the first feedback information is repeatedly sent.

[0216] Exemplarily, it is assumed that the sixth indication information indicates that the number of repetitions of the three candidates is 2, 4, and 8, respectively, wherein 2 corresponds to index 0, 4 corresponds to index 1, and 8 corresponds to index 2. After receiving the sixth indication information, the second communication device selects 4 as the number of repetitions of the first feedback information requested by the second indication information, thereby sending the second indication information indicating index 1 to the first communication device.

[0217] Optionally, if the second communication device does not receive the sixth indication information, the first indication information or the second indication information may directly indicate the value of the number of times the first feedback information is repeatedly sent. For example, the first indication information may directly indicate that the second communication device supports repeatedly sending the first feedback information 2 times, 4 times, and 8 times.

[0218] Optionally, if the second communication device does not receive the sixth indication information, the second communication device may select one or more default candidate repetition numbers from one or more default candidate repetition numbers, and indicate the indexes corresponding to the selected one or more default candidate repetition sending times through the first indication information or the second indication information.

[0219] The default candidate repetition number may be pre-agreed upon by the first communication device and the second communication device, or may be specified by a protocol.

[0220] For example, it is assumed that the default candidate repetition times include 2 times, 4 times, and 8 times, where 2 times corresponds to index 0, 4 times corresponds to index 1, and 8 times corresponds to index 2. The second communication device selects 2 times and 4 times as the number of times indicated by the first indication information that supports repeated sending of the first feedback information according to its own ability to repeatedly send the first feedback information, and thus sends the first indication information indicating index 0 and index 1 to the first communication device.

[0221] Among them, a possible implementation method in which the first indication information or the second indication information indicates the index corresponding to one or more selected candidate repeated transmission times (or default candidate repeated transmission times) may be that the first indication information or the second indication information is the index corresponding to one or more selected candidate repeated transmission times (or default candidate repeated transmission times).

[0222] Based on this solution, the second communication device can directly send an index to indicate the number of repeated transmissions of the first feedback information, thereby saving signaling overhead.

[0223] The first feedback information and the first control information indicate the number of times the first feedback information is repeatedly sent, as described above. The first reserved resource is described in detail below.

[0224] In an embodiment of the present application, in order for the second communication device to successfully repeat the first feedback information, the first communication device needs to reserve one or more resources for the second communication device. The number of the one or more reserved resources (i.e., one or more resources reserved for the repeated transmission of the first feedback information) is the same as the number of repeated transmissions of the first feedback information indicated by the first control information. Each of the one or more reserved resources is used for the transmission of the first feedback information once. For the second communication device, one reserved resource is used for the transmission of the first feedback information once. For the first communication device, one reserved resource is used for the reception of the first feedback information once.

[0225] The first reserved resource is one of the one or more reserved resources. The first communication device may indicate the first reserved resource through first control information.

[0226] It can be understood that, when the number of reserved resources is one, the first reserved resource is the only resource reserved by the first communication apparatus for the first communication apparatus for sending the first feedback information.

[0227] In an embodiment of the present application, in one or more reserved resources, each reserved resource has the same size. It should be noted that the same size of each reserved resource does not require that the time domain resources and frequency domain resources of each reserved resource are the same. Exemplarily, it is assumed that the first reserved resource occupies 2 symbols in the time domain and 2 subcarriers in the frequency domain. Another reserved resource may occupy 2 symbols in the time domain and 2 subcarriers in the frequency domain, or may occupy 4 symbols in the time domain and 1 subcarrier in the frequency domain, or may occupy 1 symbol in the time domain and 4 subcarriers in the frequency domain.

[0228] Optionally, the reserved resource may be a resource used to send an uplink signal during a random access process. Exemplarily, the reserved resource may be a PUCCH resource.

[0229] In S502, the first communication device sends the first control information to the second communication device. Correspondingly, the second communication device receives the first control information.

[0230] Optionally, in a two-step random access scenario, the first control information may be control information for scheduling Msg B, such as a PDCCH for scheduling Msg B. In a four-step random access scenario, the first control information may be control information for scheduling Msg4, such as a PDCCH for scheduling Msg4.

[0231] In S503, the second communication device may determine the number of repetitions of the first feedback information indicated by the first control information and the first reserved resource. Further, the second communication device may determine one or more reserved resources based on the first reserved resource, and determine the number of times it actually sends the first feedback information based on the number of repetitions of the first feedback information indicated by the first control information.

[0232] The following introduces different ways in which the first control information indicates the number of repeated transmissions of the first feedback information and the first reserved resources.

[0233] In a possible implementation, the first control information includes fourth indication information and fifth indication information, wherein the fourth indication information is used to indicate the number of times the first feedback information is repeatedly sent, and the fifth indication information is used to indicate the first reserved resource.

[0234] The fourth indication information may indicate the number of repeated transmissions of the first feedback information by displaying or implicitly indicating. Optionally, the fourth indication information may reuse an existing domain (or field) to indicate the number of repeated transmissions of the first feedback information. Alternatively, the fourth indication information may also be a newly added domain. Alternatively, the fourth indication information may also be a joint indication of multiple domains.

[0235] For example, the fourth indication information may reuse 1 to 2 bits in the existing field 1 to indicate the number of repeated transmissions of the first feedback information. Exemplarily, the fourth indication information may reuse bits in a downlink assignment index (DAI) field.

[0236] For another example, the fourth indication information may jointly indicate the number of repetitions of the first feedback information through a bit in field 1 and a bit in field 2. Exemplarily, in a four-step random access scenario, field 1 may be a modulation and coding scheme (MSC) field indicating the transmission of Msg4, and field 2 may be a field indicating a hybrid automatic repeat request (HARQ) process number of the transmission of Msg4. In a two-step random access scenario, field 1 may be an MSC field indicating the transmission of MsgB, and field 2 may be a field indicating a HARQ process number of the transmission of MsgB.

[0237] Optionally, the fourth indication information may be an index corresponding to the number of repeated transmissions of the first feedback information among one or more candidate repeated transmission times indicated by the sixth indication information. After receiving the fourth indication information, the second communication device may determine the number of repeated transmissions of the first feedback information indicated by the fourth indication information in combination with the sixth indication information.

[0238] Exemplarily, it is assumed that the sixth indication information indicates that the number of repetitions of the three candidates is 2, 4, and 8, respectively, wherein 2 corresponds to index 0, 4 corresponds to index 1, and 8 corresponds to index 2. The fourth indication information may directly indicate index 0, and the second communication device may determine, based on index 0, that the number of repetitions of the first feedback information indicated by the fourth indication information is 2.

[0239] Based on this solution, the first communication device can directly send an index to indicate the number of repeated transmissions of the first feedback information, thereby saving signaling overhead.

[0240] Optionally, the fourth indication information may directly indicate a value of the number of times the first feedback information is repeatedly sent. For example, the fourth indication information may directly indicate that the number of times the first feedback information is repeatedly sent is 2 times.

[0241] Optionally, in this implementation, the fifth indication information may be used to determine a second index. The second index is an index corresponding to the first reserved resource. The second communication device may determine the corresponding first reserved resource according to the second index.

[0242] Specifically, the second communication device and the first communication device may be pre-configured with the same resource configuration table. In the resource configuration table, different indexes correspond to different resources. The first communication device determines that the index corresponding to the first reserved resource in the resource configuration table is the second index, thereby sending the fifth indication information for determining the second index to the second communication device. After receiving the fifth indication information, the second communication device determines the second index, and determines the resource corresponding to the second index in the resource configuration table as the first reserved resource.

[0243] Optionally, the fifth indication information may be the second index. Alternatively, the fifth indication information may be the third index. In this case, the second communication device and the first communication device may pre-agree on a set of calculation methods, which are used to calculate the index in the resource configuration table. After receiving the third index, the second communication device substitutes the third index into the set of calculation methods for calculation, and the second index may be obtained, thereby determining the resource corresponding to the second index in the resource configuration table as the first reserved resource.

[0244] In another possible implementation, the first control information includes third indication information; the third indication information is used to determine the first index and the second index, the first index is the index corresponding to the first resource, and the second index is the index corresponding to the first reserved resource; the number of repetitions of the first feedback information is the same as the number of symbols of the first reserved resource. In other words, the third indication information can be used to determine the number of repetitions of the first feedback information and the first reserved resource.

[0245] Based on this solution, the number of repetitions of the first feedback information and the first reserved resource can be indicated by one piece of information, saving signaling overhead. In addition, since the first communication device does not need to additionally indicate the first feedback information, the impact on the existing domain in the downlink information during the random access process can be reduced.

[0246] Specifically, the second communication device and the first communication device can pre-configure the same resource configuration table. In the resource configuration table, different indexes correspond to different resources. The first communication device determines that the index corresponding to the first reserved resource in the resource configuration table is the second index, thereby sending the third indication information used to determine the first index and the second index to the second communication device. After receiving the third indication information, the second communication device determines the first index and the second index, and then determines the number of symbols of the resource corresponding to the first index in the resource configuration table (i.e., the first resource) as the number of repeated transmissions of the first feedback information indicated by the first control information, and determines the resource corresponding to the second index in the resource configuration table as the first reserved resource.

[0247] Optionally, the second index may be determined according to the first index. In this case, the second communication device may determine the first index according to the third indication information, thereby determining the index corresponding to the first index, ie, the second index, according to a mapping relationship between preconfigured indexes or a set of calculation methods.

[0248] Optionally, the third indication information may be the first index. Alternatively, the third indication information may be the fourth index. In this case, the second communication device and the first communication device may pre-agree on a set of calculation methods, which are used to calculate the index in the resource configuration table. After receiving the fourth index, the second communication device substitutes the fourth index into the set of calculation methods for calculation, and the first index may be obtained, and then the second index may be obtained based on the first index.

[0249] Exemplarily, assuming that the resource configuration table is Table 1, the third indication information is index 1, and the second communication device substitutes index 1 into the pre-agreed calculation method to calculate index 0. In the pre-configured mapping relationship, index 0 corresponds to index 11. The second communication device determines that the number of symbols of the PUCCH resource corresponding to index 0 in Table 1 is 2, thereby determining that the number of repeated transmissions of the first feedback information indicated by the first control information is 2. The second communication device determines that the PUCCH resource corresponding to index 11 in Table 1 starts from symbol 0, occupies 14 symbols, and has a PRB offset of 0, and the resource is the first reserved resource.

[0250] It can be seen that, based on this solution, the third indication information can implicitly indicate the number of repetitions of the first feedback information through the first index.

[0251] Optionally, in a scenario where the second index can be determined based on the first index, the second communication device can determine whether the first index or the resource corresponding to the first index meets the preset condition. If it is determined that the preset condition is met, the second index is further determined based on the first index, and the number of symbols of the resource corresponding to the first index is determined as the number of repeated transmissions of the first feedback information indicated by the first control information. If it is determined that the preset condition is not met, the resource corresponding to the first index is determined as the first reserved resource, and the second index does not need to be determined based on the first index.

[0252] The preset condition may be that the number of symbols of the first resource is less than (or does not exceed) a first preset threshold value. Alternatively, the preset condition may be that the value of the first index is less than (or does not exceed) a second preset threshold value.

[0253] Exemplarily, assuming that the preset condition is that the number of symbols of the first resource is less than 14, if the second communication device determines in the resource configuration table that the number of symbols of the resource corresponding to the first index is 4, the second index is further determined according to the first index, and the number of repeated transmissions of the first feedback information indicated by the first control information is determined to be 4. If the second communication device determines in the resource configuration table that the number of symbols of the resource corresponding to the first index is 14, the resource corresponding to the first index is determined as the first reserved resource.

[0254] When long sequences are used for downlink resources, more symbols are occupied and the decoding performance is better, while short sequences occupy fewer symbols than long sequences and the decoding performance is relatively poor. Therefore, for downlink information that needs to be sent repeatedly, long sequences can generally be used, and the number of symbols occupied by the corresponding resources is greater than a certain threshold. Therefore, based on this solution, when the number of symbols of the resource corresponding to the obtained first index is less than the threshold, the number of symbols of the resource can be used to implicitly indicate the repetition of the first feedback information, and the second index can be further obtained through the first index to determine the first reserved resource.

[0255] Optionally, the second communication device may determine whether the first index or the first resource corresponding to the first index meets a preset condition, and may also determine whether the second index or the resource corresponding to the second index meets another preset condition. If at least one of the two preset conditions is not met, the first resource is determined as the first reserved resource.

[0256] Among them, one preset condition may be that the number of symbols of the first resource is less than (or does not exceed) a first preset threshold. Alternatively, one preset condition may be that the value of the first index is less than (or does not exceed) a second preset threshold. Another preset condition may be that the number of symbols of the resource corresponding to the second index is not less than (or greater than) a third preset threshold. Alternatively, another preset condition may be that the value of the second index is not less than (or exceeds) a fourth preset threshold. Among them, the third preset threshold may be the same as or different from the first preset threshold. The fourth preset threshold may be the same as or different from the second preset threshold.

[0257] Exemplarily, in the above two implementations of indicating the number of repetitions of the first feedback information and the first reserved resource, the resource configuration table preconfigured by the second communication device and the first communication device can refer to Table 1. Of course, the second communication device and the first communication device can also preconfigure other resource configuration tables.

[0258] Exemplarily, in the above two implementation methods of indicating the number of repeated transmissions of the first feedback information and the first reserved resource, the second communication device and the first communication device pre-agreed on a set of calculation methods for calculating the index in the resource configuration table, can refer to the calculation method for calculating the index in Table 1 in the existing protocol. Of course, the second communication device and the first communication device can also pre-agreed on other calculation methods.

[0259] The above describes that the first control information indicates the number of repetitions of the first feedback information and the first reserved resource. The following describes how the second communication device determines the actual number of repetitions of the first feedback information and one or more reserved resources.

[0260] Regarding the actual number of repeated transmissions of the first feedback information, if the ability of the second communication device to repeatedly transmit the first feedback information cannot meet the number of repeated transmissions of the first feedback information indicated by the first control information, the second communication device may transmit the first feedback information according to the maximum number of repeated transmissions of the first feedback information supported by the second communication device.

[0261] For example, assuming that the first control information indicates that the number of repetitions of sending the first feedback information is 2 times, but the second communication device can only support sending the first feedback information once, then the second communication device can send the first feedback information once.

[0262] If the capability of the second communication apparatus to repeatedly send the first feedback information can meet the number of repeated transmissions of the first feedback information indicated by the first control information, the second communication apparatus may send the first feedback information according to the number of repeated transmissions of the first feedback information indicated by the first control information.

[0263] For example, assuming that the first control information indicates that the number of repetitions of the first feedback information is 2 times, and the second communication device supports sending the first feedback information twice, the second communication device can send the first feedback information twice as indicated by the first control information.

[0264] Regarding determining the one or more reserved resources, firstly, the second communication device may determine the number of repetitions of sending the first feedback information indicated by the first control information as the number of the one or more reserved resources.

[0265] It can be understood that when the number of reserved resources is one, the first reserved resource is the only resource reserved by the first communication device for the first communication device for sending the first feedback information. After the second communication device determines the first reserved resource according to the first control information, there is no need to determine the reserved resource again.

[0266] In the case where there are multiple reserved resources, among the multiple reserved resources, the reserved resources except the first reserved resource have a positional relationship with the first reserved resource in the time domain and / or frequency domain. After the second communication device determines the first reserved resource according to the first control information, it can determine other reserved resources according to the first reserved resource and the positional relationship, thereby determining multiple reserved resources.

[0267] Optionally, the positional relationship between the first reserved resource and the other reserved resources may be pre-agreed between the first communication device and the second communication device. Alternatively, the first communication device may indicate to the second communication device through indication information sent to the second communication device. The indication information may be sent in a unicast or broadcast manner. For example, the indication information may be carried in the first control information, or may be carried in a broadcast system message, or may be carried in MsgB / Msg4.

[0268] Optionally, the positional relationship between the first reserved resource and the other reserved resources may be that the multiple reserved resources are arranged continuously in the time domain, and the time domain position of the first reserved resource among the multiple reserved resources is the frontmost or the backmost. Alternatively, the multiple reserved resources may be arranged in the time domain at a certain interval, and the time domain position of the first reserved resource among the multiple reserved resources is the frontmost or the backmost. Generally speaking, the arrangement of multiple reserved resources in the time domain has a relatively small impact on other users, while the arrangement of multiple reserved resources in the frequency domain can enable the user to complete feedback faster with less delay. Optionally, the arrangement may be both in the time domain and in the frequency domain.

[0269] For example, Figure 6 As shown, assuming that there are 4 reserved resources, the first reserved resource and the other 3 reserved resources can be arranged continuously in the time domain, or can be arranged at a certain interval.

[0270] Optionally, the position relationship between the first reserved resource and the other reserved resources may be that the multiple reserved resources are arranged continuously in the frequency domain, and the frequency domain position of the first reserved resource among the multiple reserved resources is at the top or the bottom. Alternatively, the multiple reserved resources may be arranged in the frequency domain at a certain interval, and the frequency domain position of the first reserved resource among the multiple reserved resources is at the top or the bottom.

[0271] For example, Figure 7 As shown, assuming that there are 4 reserved resources, the first reserved resource and the other 3 reserved resources can be continuous in the frequency domain, or can be arranged at a certain interval.

[0272] Optionally, the positional relationship between the first reserved resource and the other reserved resources may correspond to the number of repeated transmissions of the first feedback information indicated by the first control information.

[0273] Optionally, the positional relationship between the first reserved resource and the other reserved resources, and the correspondence between the number of repeated transmissions of the first feedback information indicated by the first control information may be pre-agreed between the first communication device and the second communication device. Alternatively, the first communication device may indicate to the second communication device via an indication message sent to the second communication device. For example, the first communication device sends seventh indication information to the second communication device, and the seventh indication information is used to indicate the correspondence between the positional relationship and the number of repeated transmissions of the first feedback information. The seventh indication information may be sent in a unicast or broadcast manner. For example, the seventh indication information may be carried in the first control information, or may be carried in a broadcast system message, or may be carried in MsgB / Msg4.

[0274] Exemplarily, it is assumed that the first communication device and the second communication device agree that, when the number of repeated transmissions of the first feedback information indicated by the first control information is equal to 2, another reserved resource is arranged continuously with the first reserved resource in the time domain. When the number of repeated transmissions of the first feedback information indicated by the first control information is equal to 4, one reserved resource is arranged continuously with the first reserved resource in the time domain, and the other two reserved resources are arranged continuously with the first reserved resource in the frequency domain. When the number of repeated transmissions of the first feedback information indicated by the first control information is equal to 8, three reserved resources are arranged continuously with the first reserved resource in the time domain, and the other four reserved resources are arranged continuously with the first reserved resource in the frequency domain. In this example, when the number of repeated transmissions of the first feedback information indicated by the first control information is equal to 4, the schematic diagram of the positional relationship between multiple reserved resources can be as follows. Figure 8 shown.

[0275] For another example, the first communication device may agree with the second communication device that, when the number of repetitions of the first feedback information indicated by the first control information is less than or equal to 4, the other reserved resources are arranged continuously with the first reserved resources in the time domain, and when the number of repetitions of the first feedback information indicated by the first control information is greater than 4, the other reserved resources are arranged continuously with the first reserved resources in the frequency domain. Of course, in this example, the continuous arrangement may also be replaced by arrangement at a certain interval.

[0276] That is, multiple reserved resources can satisfy at least one of the following relationships:

[0277] Among the multiple reserved resources, two time-frequency resources that are adjacent in the time domain are continuous in the time domain.

[0278] Among the multiple reserved resources, two adjacent reserved resources in the frequency domain are continuous in the frequency domain.

[0279] Among the multiple reserved resources, the interval between two adjacent reserved resources in the time domain is the same.

[0280] Among the multiple reserved resources, the interval between two adjacent reserved resources in the frequency domain is the same.

[0281] Optionally, the first communication device may send eighth indication information to the second communication device; the eighth indication information is used to indicate the interval between two adjacent reserved resources in the time domain, and / or the interval between two adjacent reserved resources in the frequency domain. The eighth indication information may be sent in a unicast or broadcast manner. For example, the eighth indication information may be carried in the first control information, or may be carried in a broadcast system message, or may be carried in MsgB / Msg4.

[0282] Optionally, after sending the first control information, the first communication device may also send MsgB or Msg4 to the second communication device. In the two-step random access scenario, the first communication device sends MsgB, and in the four-step random access scenario, the first communication device sends Msg4.

[0283] Further, after receiving MsgB or Msg4, the second communication device can send the first feedback information through the reserved resources. If the actual number of repeated transmissions of the first feedback information determined by the second communication device is less than the number of repeated transmissions of the first feedback information indicated by the first control information, the second communication device can select a reserved resource from one or more reserved resources to send the first feedback information (for example, a reserved resource can be randomly selected, or a reserved resource with a forward time domain position can be selected). If the actual number of repeated transmissions of the first feedback information determined by the second communication device is the same as the number of repeated transmissions of the first feedback information indicated by the first control information, the second communication device can send the first feedback information through each reserved resource.

[0284] Correspondingly, after sending MsgB or Msg4, the first communication device can try to receive the first feedback information at each reserved resource. In other words, the first communication device can receive the first feedback information through one or more reserved resources.

[0285] It should be noted that in the above method embodiment, the first control information can be replaced by the corresponding downlink information, and the random access method provided in the embodiment of the present application can still be applied. For example, in the scenario of two-step random access, the first control information can be replaced by MsgB, and MsgB indicates the number of repeated transmissions of the first feedback information and the first reserved resource. In the scenario of four-step random access, the first control information can be replaced by Msg4, and Msg4 indicates the number of repeated transmissions of the first feedback information and the first reserved resource. Its specific implementation can refer to the above method embodiment.

[0286] The embodiment of the present application may also provide another random access method. The random access method includes steps S901-S902:

[0287] S901. The second communication device determines the number of repeated transmissions of the first signal from the first communication device.

[0288] S902. The second communication device determines the number of repeated transmissions of the first feedback information according to the number of repeated transmissions of the first signal.

[0289] The first feedback information may be specifically described in S501 and will not be elaborated here.

[0290] The first signal is a downlink signal sent by the first communication device to the second communication device during the random access process before the second communication device sends the first feedback information. Exemplarily, in a two-step random access scenario, the first signal may be Msg3. In a four-step random access scenario, the first signal may be MsgA.

[0291] For S901, optionally, the second communication device may determine the number of repeated transmissions of the first signal according to indication information from the first communication device indicating the number of repeated transmissions of the first signal. Exemplarily, the first communication device may indicate through the indication information that the number of repeated transmissions of the first signal is N, where N may be an integer greater than or equal to 1.

[0292] Alternatively, the second communication device may determine the number of repeated transmissions of the first signal according to the number of times the first signal is received.

[0293] For S902, in a possible implementation, the second communication device can pre-agree with the first communication device on the relationship between the number of repeated transmissions of the first signal and the number of repeated transmissions of the first feedback information, and the second communication device can determine the number of repeated transmissions of the first feedback information based on the pre-agreed relationship and the number of repeated transmissions of the first signal.

[0294] Exemplarily, assuming that the number of repetitions of the first feedback information is M, the number of repetitions of the first signal is N, the second communication device can pre-agreed with the first communication device that M=2*N or M=N+K, wherein the value of K is also pre-agreed by the second communication device and the first communication device.

[0295] In another possible implementation, the first communication device may send indication information to the second communication device to indicate the relationship between the number of repeated transmissions of the first signal and the number of repeated transmissions of the first feedback information. The second communication device may determine the number of repeated transmissions of the first feedback information based on the indication information and the number of repeated transmissions of the first signal.

[0296] Optionally, the first communication device may send the indication information in a broadcast or unicast form. If sent in a broadcast form, the indication information may be carried in a system message, such as SIB1. If sent in a unicast form, the indication information may be carried in information used to schedule MsgB / Msg4, or the indication information may be carried in MsgB / Msg4.

[0297] Exemplarily, assuming that the number of repetitions of the first feedback information is M, the number of repetitions of sending the first signal is N, the first communication device sends indication information to the second communication device, indicating that M=2*N.

[0298] In another possible implementation, the second communication device may jointly determine the number of repeated transmissions of the first feedback information according to a pre-agreed relationship between the second communication device and the first communication device and a value in the pre-agreed relationship indicated by the first communication device.

[0299] Optionally, the first communication device may send the indication information in a broadcast or unicast form. If sent in a broadcast form, the indication information may be carried in a system message, such as SIB1. If sent in a unicast form, the indication information may be carried in information used to schedule MsgB / Msg4, or the indication information may be carried in MsgB / Msg4.

[0300] Exemplarily, assuming that the number of repetitions of the first feedback information is M and the number of repetitions of the first signal is N, the second communication device and the first communication device may pre-agreed that M=N+K. The value of K may be indicated by indication information sent by the first communication device to the second communication device.

[0301] In another possible implementation, the second communication device may jointly determine the number of times the first feedback information is repeatedly sent based on a pre-agreed relationship with the first communication device and a value in the pre-agreed relationship determined by the second communication device.

[0302] Optionally, in this implementation, the value in the pre-agreed relationship determined by the second communication device itself may be generated by itself, or may be a value selected from one or more candidate values ​​indicated to the second communication device by the first communication device.

[0303] Further, in this implementation, the second communication device may indicate the numerical value in the pre-agreed relationship determined by itself to the first communication device. Optionally, the second communication device may directly indicate the numerical value, or may indicate the index corresponding to the numerical value. The index corresponding to the numerical value may be determined based on the indexes corresponding to one or more candidate numerical values ​​indicated by the first communication device to the second communication device.

[0304] Optionally, the information indicating the value sent by the second communication device to the first communication device may be carried in MsgA (two-step random access scenario) or Msg3 (four-step random access scenario).

[0305] Exemplarily, assuming that the number of repetitions of the first feedback information is M, and the number of repetitions of the first signal is N, the second communication device can pre-agree with the first communication device that M=N+K. The value of K can be generated by the second communication device itself, and the value of K is indicated to the first communication device through indication information. Alternatively, the value of K can be a value selected by the second communication device from one or more candidate values ​​indicated by the first communication device. Assuming that in one or more candidate values, the value of K corresponds to index 1, the second communication device can indicate index 2 to the first communication device through indication information.

[0306] Optionally, the second communication device may also determine one or more reserved resources, and the one or more reserved resources are used to send the first feedback information. The specific determination method can refer to the introduction of S501-S503 above, which will not be repeated here.

[0307] It should be noted that if other random access forms emerge, the random access method including S901-S902 provided in the embodiment of the present application can also be applied to the newly emerged random access scenario. Msg3 / MsgA appearing in the introduction of S901-S902 can be replaced with other uplink information in other random access scenarios, and MsgB / Msg4 appearing below can be replaced with other downlink information in other random access scenarios.

[0308] It can be understood that in each of the above embodiments, the method and / or step implemented by the first communication device can also be implemented by a component (such as a chip or circuit) that can be used for the first communication device, or a device including the above first communication device. The method and / or step implemented by the second communication device can also be implemented by a component (such as a chip or circuit) that can be used for the second communication device, or a device including the above second communication device.

[0309] Accordingly, the embodiments of the present application also provide a communication device for implementing the above embodiments. It is understandable that the communication device includes a hardware structure and / or software module corresponding to each function in order to implement the above functions. It should be easily appreciated by those skilled in the art that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0310] The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0311] In the case of dividing each functional module into corresponding functional modules, Fig. 9 A possible structural diagram of the communication device involved in the above embodiment is shown. Fig. 9 As shown, the device 900 includes a transceiver module 901 and a processing module 902 .

[0312] Taking the communication device 900 as the second communication device in the above embodiment as an example, in a possible implementation, the transceiver module 901 is used to execute S501-S503, S901-S902, and / or other processes of the technical solution described herein, the second communication device executes methods related to receiving and sending information / data and methods related to sending information / data. The processing module 902 is used to execute S501-S503, and / or other processes of the technical solution described herein, the second communication device executes methods related to processing information / data.

[0313] Taking the communication device 900 as the first communication device in the above embodiment as an example, in a possible implementation, the transceiver module 901 is used to execute S501-S503, S901-S902, and / or other processes of the technical solution described herein, the method related to receiving and sending information / data and the method related to sending information / data executed by the first communication device. The processing module 902 is used to execute S501-S503, and / or other processes of the technical solution described herein, the method related to processing information / data executed by the first communication device.

[0314] It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0315] In this embodiment, the communication device 900 is presented in the form of dividing various functional modules in an integrated manner. The "module" here may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and / or other devices that can provide the above functions.

[0316] In a simple embodiment, those skilled in the art will appreciate that the communication device 900 may be used Figure 3 The terminal device is shown in the form of.

[0317] for example, Figure 3 The processor 401 in the terminal device shown can call the computer execution instruction stored in the memory 402 to enable the communication device 900 to execute the random access method in the above method embodiment. Specifically, Fig. 9 The functions / implementation processes of the transceiver module 901 and the processing module 902 can be Figure 3 The processor 401 shown calls the computer execution instructions stored in the memory 402 to implement. Or, Fig. 9 The function / implementation process of the processing module 902 in Figure 3 The processor 401 shown calls the computer execution instructions stored in the memory 402 to implement, Fig. 9 The function / implementation process of the transceiver module 901 can be Figure 3 The communication interface 403 is shown.

[0318] In a simple embodiment, those skilled in the art will appreciate that the communication device 900 may be used Figure 3 The form of the network device shown.

[0319] for example, Figure 3The processor 301 in the network device shown can call the computer execution instruction stored in the memory 302 to enable the communication device 900 to execute the random access method in the above method embodiment. Specifically, Fig. 9 The functions / implementation processes of the transceiver module 901 and the processing module 902 can be Figure 3 The processor 301 shown calls the computer execution instructions stored in the memory 302 to implement. Or, Fig. 9 The function / implementation process of the processing module 902 in Figure 3 The processor 301 shown calls the computer execution instructions stored in the memory 302 to implement, Fig. 9 The function / implementation process of the transceiver module 901 can be Figure 3 The communication interface 303 is shown.

[0320] Since the communication device 900 provided in this embodiment can execute the above communication method, the technical effects that can be obtained can refer to the above method embodiments and will not be repeated here.

[0321] It should be noted that one or more of the above modules or units can be implemented by software, hardware or a combination of the two. When any of the above modules or units is implemented by software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flow. The processor can be built into an SoC (system on chip) or an ASIC, or it can be an independent semiconductor chip. In addition to the core used to execute software instructions for calculation or processing within the processor, it can further include necessary hardware accelerators, such as a field programmable gate array (FPGA), a programmable logic device (PLD), or a logic circuit that implements a dedicated logic operation.

[0322] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of a CPU, a microprocessor, a DSP chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, a SoC, an FPGA, a PLD, a dedicated digital circuit, a hardware accelerator or a non-integrated discrete device, which can run the necessary software or not rely on the software to execute the above method flow.

[0323] Optionally, an embodiment of the present application further provides a chip system, including: at least one processor and an interface, the at least one processor is coupled to a memory through the interface, and when the at least one processor executes a computer program or instruction in the memory, the method in any of the above method embodiments is executed. In one possible implementation, the communication device also includes a memory. Optionally, the chip system can be composed of chips, or can include chips and other discrete devices, which is not specifically limited in the embodiments of the present application.

[0324] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software programs, all or part of the embodiments may be implemented in the form of computer program products.

[0325] The present application provides a computer program product including one or more computer instructions, which, when executed on a communication device, enables any method of the embodiments of the present application to be executed.

[0326] When the computer program instructions are loaded and executed on the computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0327] The computer instructions may be stored in a computer-readable storage medium. The embodiment of the present application provides a computer-readable storage medium, in which instructions are stored, and when the computer-readable storage medium is run on a communication device, any method of the embodiment of the present application is executed.

[0328] Computer instructions can be transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer-readable storage media can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available media integrated therein. Available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media [e.g., digital versatile discs (DVD)], or semiconductor media (e.g., solid state drives (SSD)), etc.

[0329] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in a claim. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0330] Although the present application has been described in conjunction with specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. 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 communication method, characterized in that: Applied to a first communication device, the method comprises: receiving first indication information sent by a second communication device, where the first indication information is used to indicate a capability of the second communication device to repeatedly send first feedback information; The number of times the first feedback information is repeatedly sent indicated by the first control information is determined according to the capability of the second communication apparatus to repeatedly send the first feedback information.

2. The method according to claim 1, characterized in that The method further comprises: Send MsgB or the Msg4.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: Receive second indication information; the second indication information is used to indicate a request to repeatedly send the first feedback information.

4. The method according to claim 3, characterized in that The second indication information is used to indicate a request to repeatedly send the first feedback information, and includes: The second indication information is used to indicate the number of times of requesting to repeatedly send the first feedback information.

5. A communication method, characterized in that: Applied to a second communication device, the method comprises: Sending first indication information to the first communication device, where the first indication information is used to indicate a capability of the second communication device to repeatedly send the first feedback information; First control information is received, where the number of times the first feedback information is repeatedly sent indicated by the first control information is determined based on a capability of the second communication device to repeatedly send the first feedback information.

6. The method according to claim 5, characterized in that The method further comprises: Receive the MsgB or Msg4.

7. The method according to claim 5 or 6, characterized in that: The method further comprises: Send second indication information; the second indication information is used to indicate a request to repeatedly send the first feedback information.

8. The method according to claim 7, characterized in that The second indication information is used to indicate a request to repeatedly send the first feedback information, and includes: The second indication information is used to indicate the number of times of requesting to repeatedly send the first feedback information.

9. A communication device, characterized in that: The communication device is used to implement the method according to any one of claims 1 to 8.

10. A communication device, characterized in that: The communication device comprises: a processor, wherein the processor is configured to execute instructions stored in a memory; when the instructions are executed by the processor, the communication device executes the method according to any one of claims 1 to 8.

11. The device according to claim 10, characterized in that The communication device further comprises the memory.

12. A computer-readable storage medium, characterized in that: Instructions are stored thereon, and when the instructions are executed by a computer, the method according to any one of claims 1 to 8 is executed.

13. A computer program product, characterized in that The computer program product comprises instructions, and when the instructions are executed by a computer, the method according to any one of claims 1 to 8 is performed.

14. A chip, characterized in that: The chip includes: a processor, and the processor is used to execute instructions so that a device including the chip performs the method according to any one of claims 1-8.

15. The chip according to claim 14, characterized in that: The chip further comprises a memory, wherein the memory is used to store the instructions.

16. A communication system, characterized in that: The communication system includes a terminal device and a network device, wherein the terminal device is used to execute the method according to any one of claims 5 to 8, and the network device is used to execute the method according to any one of claims 1 to 4.

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