Random access method, communication apparatus, and communication device

Abstract

This application provides a random access method, communication device, and communication equipment. The method includes: determining a mapping ratio based on the number of a first transmission resource group and a second transmission resource group in a resource cycle; the first transmission resource group consists of multiple consecutive Remote Routers (ROs) in the time domain and a preamble; the second transmission resource group consists of multiple consecutive Remote Points (POs) in the time domain and a DMRS resource. Then, a first mapping relationship between the first and second transmission resource groups is determined based on the mapping ratio L. A random access message including a first preamble and first random access information is sent; the first preamble is repeatedly transmitted on multiple ROs in a first transmission resource group, and the first random access information is repeatedly transmitted on multiple POs in the second transmission resource group corresponding to the first transmission resource group. This method can enhance the coverage of data transmission during random access and meet reliability requirements.

Description

Technical Field

[0001] This application relates to communication technology, and more particularly to a random access method, communication device, and communication equipment. Background Technology

[0002] In the two-step random access process, the terminal device first sends a preamble and data, and the terminal device receives the network's random access response message in the second step.

[0003] With the expansion of mobile communication system applications (such as satellite communication), the requirements for uplink signal coverage are becoming increasingly stringent. How to enhance the coverage of random access messages during random access to meet communication needs is a problem that needs to be solved. Summary of the Invention

[0004] This application provides a random access method, communication device, and communication equipment, which can enhance the coverage of data transmission during random access and meet reliability requirements.

[0005] Firstly, a random access method is provided, including:

[0006] Based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle, the mapping ratio L between the first transmission resource group and the second transmission resource group is determined. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The second transmission resource group is used to carry random access information. L, K1, and K2 are all positive integers.

[0007] Based on the mapping ratio L, a first mapping relationship is determined. The first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In the first mapping relationship, L of the first transmission resource groups correspond to one of the second transmission resource groups.

[0008] Send a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0009] In one optional implementation, determining the first mapping relationship based on the mapping ratio L includes:

[0010] Based on the mapping ratio L and the mapping rule, the first mapping relationship is determined.

[0011] The mapping rule is that, according to the order of the first transmission resource group and the order of the second transmission resource group, every L first transmission resource groups correspond to one second transmission resource group in sequence.

[0012] In one optional implementation, every K1 consecutive ROs in the time domain in a resource period constitutes an RO group, and ROs belonging to the same RO group have the same frequency domain resources. In a resource period, the indexes of the RO groups are arranged from smallest to largest in the frequency domain order and then in the time domain order. One RO group and one preamble constitute a first transmission resource group.

[0013] In one alternative implementation, the first transmission resource group is arranged in the following order during a resource cycle:

[0014] First, within a RO group, the preambles are arranged in ascending order of their indexes. Each RO group is used to carry multiple preambles, and these multiple preambles belong to different first transmission resource groups.

[0015] Secondly, arrange them sequentially according to the order of the RO groups.

[0016] That is, the sequential arrangement of the first transmission resource group in this resource cycle is as follows:

[0017] For the first transmission resource group with the same RO group, the first transmission resource group is arranged in ascending order according to the index of the preamble;

[0018] For different first transmission resource groups of RO groups, the first transmission resource groups are arranged sequentially according to the order of the RO groups.

[0019] In one optional implementation, every K2 consecutive POs in the time domain in a resource period constitute a PO group, and POs belonging to the same PO group have the same frequency domain resources. In a resource period, the PO groups are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One PO group and one preamble constitute one first transmission resource group.

[0020] In one alternative implementation, the second transmission resource group is arranged in the following order during a resource cycle:

[0021] First, sort them in ascending order of frequency domain resources of the PO group;

[0022] Secondly, within a PO group, the demodulation reference signal resources are arranged in ascending order of their indexes, wherein each PO group is used to carry multiple demodulation reference signals, and the demodulation reference signal resources of the multiple demodulation reference signals belong to different second transmission resource groups.

[0023] Finally, sort them in ascending order of time-domain resources according to the PO group.

[0024] In one optional implementation, a demodulation reference signal resource consists of a demodulation reference signal port and a demodulation reference signal sequence, and the indexes of the demodulation reference signal resource are arranged sequentially first according to the index order of the demodulation reference signal port and then according to the index order of the demodulation reference signal sequence.

[0025] That is, for demodulation reference signal resources with the same demodulation reference signal sequence, the index of the demodulation reference signal resource increases sequentially in ascending order of the demodulation reference signal port index; for demodulation reference signal resources with different demodulation reference signal sequences, the index of the demodulation reference signal resource increases sequentially in ascending order of the demodulation reference signal sequence index.

[0026] In one alternative implementation, K1 and K2 are predefined; or, the method further includes:

[0027] Receive first indication information from the network device, the first indication information being used to indicate a first value of K1 and a second value of K2.

[0028] In one alternative implementation, the method further includes:

[0029] Receive a second indication information from the network device, the second indication information being used to indicate the first value of K1;

[0030] Based on the first value of K1, determine the second value of K2;

[0031] or,

[0032] Receive a third indication information from the network device, the third indication information being used to indicate a second value for K2;

[0033] Based on the second value of K2, determine the first value of K1.

[0034] In one optional implementation, determining the second value of K2 based on the first value of K1 includes:

[0035] Based on the first value of K1 and the second mapping relationship, determine the second value of K2;

[0036] or,

[0037] The first value of K1 is determined based on the second value of K2, including:

[0038] Based on the second value of K2 and the second mapping relationship, determine the first value of K1.

[0039] The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, wherein the first value corresponds to the second value in the second mapping relationship.

[0040] In one alternative implementation, the second mapping relationship is predefined; alternatively, the method further includes:

[0041] Receive configuration information from the network device, which is used to configure the second mapping relationship.

[0042] Secondly, a random access method, the method comprising:

[0043] Based on the mapping ratio L between the first transmission resource group and the second transmission resource group within the resource period, a first mapping relationship is determined. This first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In this first mapping relationship, L of the first transmission resource groups correspond to one of the second transmission resource groups. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The second transmission resource group is used to carry random access information. L, K1, and K2 are all positive integers.

[0044] A random access message is received, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0045] In one possible implementation, determining the first mapping relationship based on the mapping ratio L between the first transmission resource group and the second transmission resource group within a resource cycle includes:

[0046] Based on the mapping ratio L and the mapping rule, the first mapping relationship is determined.

[0047] The mapping rule is that, according to the order of the first transmission resource group and the order of the second transmission resource group, every L first transmission resource groups correspond to one second transmission resource group in sequence.

[0048] In one possible implementation, every K1 consecutive ROs in the time domain in a resource period constitute a RO group, and ROs belonging to the same RO group have the same frequency domain resources. In a resource period, the indexes of the RO group are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One RO group and one preamble constitute a first transmission resource group.

[0049] In one possible implementation, the first transmission resource group is arranged in the following order during a resource cycle:

[0050] First, within a RO group, the preambles are arranged in ascending order of their indexes. Each RO group is used to carry multiple preambles, and these multiple preambles belong to different first transmission resource groups.

[0051] Secondly, arrange them sequentially according to the order of the RO groups.

[0052] That is, for the first transmission resource group with the same RO group, the first transmission resource group is arranged in ascending order of the preamble index;

[0053] For different first transmission resource groups of RO groups, the first transmission resource groups are arranged sequentially according to the order of the RO groups.

[0054] In one possible implementation, every K2 consecutive POs in the time domain in a resource period constitute a PO group, and POs belonging to the same PO group have the same frequency domain resources. In a resource period, the PO groups are arranged from smallest to largest according to frequency domain order and then according to time domain order. One PO group and one demodulation reference signal resource constitute a second transmission resource group.

[0055] In one possible implementation, the second transmission resource group is arranged in the following order during a resource cycle:

[0056] First, sort them in ascending order of frequency domain resources of the PO group;

[0057] Secondly, within a PO group, the demodulation reference signal resources are arranged in ascending order of their indexes, wherein each PO group is used to carry multiple demodulation reference signals, and the demodulation reference signal resources of the multiple demodulation reference signals belong to different second transmission resource groups.

[0058] Finally, sort them in ascending order of time-domain resources according to the PO group.

[0059] In one possible implementation, a demodulation reference signal resource consists of a demodulation reference signal port and a demodulation reference signal sequence, and the indexes of the demodulation reference signal resource are arranged sequentially first according to the index order of the demodulation reference signal port and then according to the index order of the demodulation reference signal sequence.

[0060] That is, for demodulation reference signal resources with the same demodulation reference signal sequence, the index of the demodulation reference signal resource increases sequentially in ascending order of the demodulation reference signal port index; for demodulation reference signal resources with different demodulation reference signal sequences, the index of the demodulation reference signal resource increases sequentially in ascending order of the demodulation reference signal sequence index.

[0061] In one possible implementation, K1 and K2 are predefined; or, the method further includes:

[0062] Determine the first value of K1 and the second value of K2;

[0063] Send a first indication message, which is used to indicate the first value of K1 and the second value of K2.

[0064] In one possible implementation, the method further includes:

[0065] Determine the first value of K1 and the second value of K2;

[0066] Send a second indication message to indicate the first value of K1, or send a third indication message to indicate the second value of K2.

[0067] In one possible implementation, determining the first value of K1 and the second value of K2 includes:

[0068] Based on the second mapping relationship, determine the first value of K1 and the second value of K2.

[0069] The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, wherein the first value corresponds to the second value in the second mapping relationship.

[0070] In one possible implementation, the second mapping relationship is predefined, or the method further includes:

[0071] Determine the second mapping relationship.

[0072] Send configuration information, which is used to configure the second mapping relationship.

[0073] Thirdly, a communication device includes:

[0074] The processing module is used to determine the mapping ratio L between the first transmission resource group and the second transmission resource group based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The second transmission resource group is used to carry random access information. L, K1, and K2 are all positive integers.

[0075] The processing module is also used to determine a first mapping relationship based on the mapping ratio. The first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In the first mapping relationship, L of the first transmission resource groups correspond to one of the second transmission resource groups.

[0076] The transceiver module is used to send a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0077] In one optional implementation, the processing module is specifically used to determine the first mapping relationship according to the mapping ratio L and the mapping rule, wherein the mapping rule is that every L first transmission resource groups correspond to one second transmission resource group in sequence according to the arrangement order of the first transmission resource groups and the arrangement order of the second transmission resource groups.

[0078] In one optional implementation, the transceiver module is further configured to receive first indication information from the network device, the first indication information being used to indicate a first value of K1 and a second value of K2.

[0079] In one optional implementation, the transceiver module is further configured to receive second indication information from the network device, the second indication information being used to indicate the first value of K1; the processing module is also further configured to determine the second value of K2 based on the first value of K1.

[0080] In one optional implementation, the transceiver module is specifically used to determine the second value of K2 based on the first value of K1 and the second mapping relationship.

[0081] The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, wherein the first value corresponds to the second value in the second mapping relationship.

[0082] In one optional implementation, the transceiver module is further configured to receive third indication information from the network device, the third indication information being used to indicate a second value of K2; the processing module is also further configured to determine a first value of K1 based on the second value of K2.

[0083] In one optional implementation, the transceiver module is specifically used to determine the first value of K1 based on the second value of K2 and the aforementioned second mapping relationship.

[0084] In one optional implementation, the transceiver module is further configured to receive configuration information from a network device, the configuration information being used to configure the second mapping relationship.

[0085] Fourthly, a communication device, comprising:

[0086] The processing module is used to determine a first mapping relationship based on the mapping ratio L between the first transmission resource group and the second transmission resource group within the resource period. The first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In the first mapping relationship, L of the first transmission resource groups correspond to one of the second transmission resource groups. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The PO is used to carry random access information, and the demodulation reference signal resource is used to demodulate the random access information. L, K1, and K2 are all positive integers.

[0087] The transceiver module is used to receive a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0088] In one optional implementation, the processing module is specifically used to determine the first mapping relationship according to the mapping ratio L and the mapping rule, wherein the mapping rule is that every L first transmission resource groups correspond to one second transmission resource group in sequence according to the arrangement order of the first transmission resource groups and the arrangement order of the second transmission resource groups.

[0089] In an optional implementation, the processing module is further configured to determine a first value of K1 and a second value of K2. The transceiver module is further configured to send first indication information, which indicates the first value of K1 and the second value of K2.

[0090] In one optional implementation, the processing module determines a first value for K1 and a second value for K2. The transceiver module is further configured to send second indication information to indicate the first value of K1, or to send third indication information to indicate the second value of K2.

[0091] In one optional implementation, the processing module is specifically used to determine a first value of K1 and a second value of K2 according to a second mapping relationship, wherein the second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, and the first value corresponds to the second value in the second mapping relationship.

[0092] In one optional implementation, the processing module is further configured to determine a second mapping relationship, and the transceiver module is further configured to send configuration information for configuring the second mapping relationship.

[0093] Fifthly, a processing apparatus is provided, comprising: a logic circuit and a communication interface, wherein the communication interface is used to acquire data to be processed and / or output processed data, and the logic circuit is used to obtain processed data from the data to be processed, so that the processing apparatus performs the method of the first aspect and any possible implementation thereof, or performs the method of the second aspect and any possible implementation thereof.

[0094] In one feasible design, the communication interface includes an input interface and an output interface.

[0095] A sixth aspect provides a communication device including a processor and a memory. The processor is used to read instructions stored in the memory and to receive and transmit signals via a transceiver to execute the methods of the first aspect and any possible implementation thereof, or to execute the methods of the second aspect and any possible implementation thereof.

[0096] In a seventh aspect, a computer program product is provided, comprising: a computer program (also referred to as code or instructions) that, when run, causes a computer to perform the methods of the first aspect and any possible implementation thereof, or to perform the methods of the second aspect and any possible implementation thereof.

[0097] Eighthly, a computer-readable medium is provided that stores a computer program (also referred to as code or instructions) that, when run on a computer, causes the computer to perform the methods of the first aspect and any possible implementation thereof, or to perform the methods of the second aspect and any possible implementation thereof.

[0098] Ninthly, a communication system is provided, which may include at least one communication device provided in a third aspect and at least one communication device provided in a second aspect. Attached Figure Description

[0099] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0100] Figure 1 This is a schematic diagram of a communication system applicable to embodiments of this application;

[0101] Figure 2 This is a schematic flowchart of a four-step random access process provided in an embodiment of this application;

[0102] Figure 3 This is a schematic flowchart of a two-step random access process provided in an embodiment of this application;

[0103] Figure 4 This is a schematic diagram of a PO within a resource cycle provided in an embodiment of this application;

[0104] Figure 5 This is a schematic flowchart of a random access method provided in an embodiment of this application;

[0105] Figure 6 This is a schematic diagram of a RO group within a resource cycle provided in an embodiment of this application;

[0106] Figure 7 This is a schematic diagram of a PO group within a resource cycle provided in an embodiment of this application;

[0107] Figure 8 This is a schematic diagram of the first mapping relationship provided in an embodiment of this application;

[0108] Figure 9 This is a schematic diagram of the communication device provided in the embodiments of this application;

[0109] Figure 10 This is a schematic diagram of the structure of the terminal device provided in the embodiments of this application;

[0110] Figure 11 This is a schematic diagram of the network device provided in the embodiments of this application.

[0111] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0112] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0113] The names used in the embodiments of this application are explained below.

[0114] Network equipment: A device with wireless transceiver capabilities. This includes, but is not limited to: evolved node Bs (eNBs or eNodeBs) in Long Term Evolution (LTE), base stations (gNodeBs or gNBs) or transmission receiving points (TRPs) in New Radio (NR) technology, base stations in subsequent evolution systems, access nodes, wireless relay nodes, and wireless backhaul nodes in Wireless Fidelity (WiFi) systems. Base stations can be: macro base stations, micro base stations, pico base stations, small cells, relay stations, or satellite stations, etc. Multiple base stations can support networks using the same technology mentioned above, or they can support networks using different technologies mentioned above. A base station can contain one or more TRPs.

[0115] Terminal devices are devices with wireless transceiver capabilities. Terminal devices can be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; they can also be deployed on water (such as ships); and in the air (such as airplanes, balloons, and satellites). Terminal devices can be mobile phones, tablets, computers with wireless transceiver capabilities, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, vehicle-mounted terminal devices, wireless terminals in self-driving vehicles, wireless terminal devices in remote medical care, wireless terminal devices in smart grids, wireless terminal devices in transportation safety, wireless terminal devices in smart cities, wireless terminal devices in smart homes, wearable terminal devices, etc. The terminal equipment involved in the embodiments of this application may also be referred to as a terminal, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile device, UE terminal equipment, wireless communication equipment, UE agent, or UE device, etc. The terminal equipment may also be fixed or mobile.

[0116] Figure 1 This is a schematic diagram of a communication system 100 applicable to the random access method provided in the embodiments of this application. The communication system 100 includes at least one network device, such as... Figure 1 The network device 101 shown, the communication system 100 also includes at least one terminal device, such as Figure 1 The terminal device 102 shown can send random access messages using the random access method provided in this application embodiment, thereby enhancing the coverage of data transmission during the random access process.

[0117] The following describes the relevant technologies and terms involved in the embodiments of this application.

[0118] I. Four-step random access process

[0119] Terminal devices can first achieve time and frequency synchronization with the network by detecting synchronization signals and physical broadcast channel blocks (SSBs). Figure 2This is a schematic flowchart illustrating the random access process for terminal devices. After completing time-frequency synchronization, the terminal device can execute the following... Figure 2 The random access procedure is illustrated. The terminal device first determines the physical random access channel (PRACH) occasion (RO) and the random access preamble based on SIB 1. The RO is the time-frequency resource used to carry the random access preamble; it can also be called a physical random access channel transmission opportunity, but this application is not limited to this. The terminal device sends the preamble, i.e., the random access request message (Msg.1), on an RO. That is, Msg.1 includes the preamble and the RO carrying it. The preamble is used by the network device to detect Msg.1, and the RO is used by the network device to calculate the radio network temporary identifier (RA-RNTI) based on the time and frequency of the RO. If the network device correctly receives the terminal device's Msg.1, it sends a random access response message (Msg.2) to the terminal device, which is scrambled with the RA-RNTI. The network device and the terminal device can calculate the RA-RNTI respectively based on the time and frequency of the RO. After sending Msg.1, the terminal device can use the RA-RNTI to detect Msg.2 from the network device. Msg.2 may include time advance (TA), temporary cell-RNTI (TC-RNTI), power adjustment, and uplink grant information (UL grant) for the terminal device to send Random Access Message 3 (Msg.3). Upon receiving Msg.2, the terminal device can send Msg.3 to the network device based on the uplink grant information in Msg.2. Msg.3 includes the terminal device's identity information and radio resource control (RRC) connection establishment information (hereinafter referred to as random access information). Finally, the network device can send Msg.4 to the terminal device. Msg.4 is used for contention resolution, and the network device can use Msg.4 to notify the terminal device that the random access procedure is complete. Otherwise, if the terminal device does not detect Msg.4, it considers the random access procedure to have failed.

[0120] II. Two-step random access process

[0121] With the increasing application scenarios, such as non-terrestrial networks (NTNs) like satellite communication, there are high round-trip times (RTTs) (e.g., up to 600ms for geostationary satellites) and propagation delay differences (e.g., up to 16ms for geostationary satellites). To reduce the number of interactions between terminal devices and network devices during connection establishment and connection restoration, and to reduce the latency of terminal devices accessing the network, a two-step random access procedure is proposed in mobile communication systems.

[0122] Figure 3 This is a schematic flowchart of a two-step random access procedure. The two-step random access procedure includes the terminal device sending a random access message A (Msg.A) to the network device and the terminal device receiving a random access message B (Msg.B) from the network device. Msg.A includes a preamble carried on the RO (equivalent to the preamble carried on the RO in Msg.1 of the four-step random access procedure), random access information carried on the physical uplink shared channel (PUSCH) occasion (PO) (equivalent to the random access information carried in Msg.3 of the four-step random access procedure), and demodulation reference signal resources for demodulating this random access information. Similar to the four-step random access procedure, the terminal device can determine the RO resource and preamble based on SIB1. For the PUSCH carrying the random access information in Msg.A, the protocol specifies that the network device configures the PO through system information; the PO can also be called a PUSCH transmission opportunity, but this application is not limited to this.

[0123] It should be understood that, in the embodiments of this application, the terminal device sending a preamble on the RO can be referred to as the terminal device transmitting PRACH on the RO, that is, the PRACH consists of the RO and the preamble. The terminal device sending random access information and DMRS on the PO can be referred to as the terminal device transmitting PUSCH on the PO. The PUSCH consists of random access information and DMRS, and the DMRS is used to demodulate the random access information.

[0124] Terminal devices can determine the time-frequency location of each PO using system information from network devices. For example... Figure 4As shown, in the time domain, the terminal device can determine the time offset between the start time of the first PUSCH time slot and the PRACH time slot, as well as the number of PUSCH time slots in each resource period. For each PUSCH time slot, it can determine the number m of time division multiplexing (TDM) POs in each PUSCH time slot, and the guard period (GP) between adjacent time-domain POs. In the frequency domain, the terminal device can determine the frequency start point of the first PUSCH time slot. For each PUSCH time slot, it can determine the number n of frequency division multiplexing (FDM) POs in each PUSCH time slot, the number of RBs occupied by each PO, and the guard band (GB) between adjacent frequency-domain POs. Furthermore, the terminal device can transmit PUSCHs within a PO. Each PUSCH includes random access information (such as UE identity information and RRC connection establishment information) and DMRS resources. Multiple PUSCHs can be carried for the same PO time-frequency resources, and different PUSCHs can be distinguished by different DMRS resources. DMRS resources include DMRS sequences and antenna ports for transmitting DMRS (called DMRS ports). Two PUSCHs within the same PO may correspond to different DMRS ports and / or different DMRS sequences. For example... Figure 4 As shown, the same PO resource can carry four PUSCHs, each corresponding to a different DMRS resource. These are: DMRS resource 0, composed of DMRS port 0 and DMRS sequence 0 (i.e., the DMRS resource of DMRS sequence 0 sent through DMRS port 0); DMRS resource 1, composed of DMRS port 1 and DMRS sequence 0; DMRS resource 2, composed of DMRS port 0 and DMRS sequence 1; and DMRS resource 3, composed of DMRS port 1 and DMRS sequence 1. A mapping relationship exists between preambles and POs; one or more preambles correspond to one PO. The terminal device can select a corresponding preamble and PO to send Msg.A to the network device.

[0125] With the expansion of mobile communication system application scenarios (such as satellite communication scenarios), the requirements for the coverage of uplink signal transmission are becoming increasingly stringent. This application proposes repeatedly transmitting the preamble in Msg.A on multiple consecutive ROs in the time domain and repeatedly transmitting the random access information in Msg.A on multiple consecutive POs in the corresponding time domain. This enhances the coverage of data transmission during the random access process and meets the reliability requirements of random access messages.

[0126] The random access method provided in this application will be described below with reference to the accompanying drawings.

[0127] Figure 5 This is a schematic flowchart of a random access method provided in an embodiment of this application.

[0128] S501, the terminal device determines the mapping ratio L between the first transmission resource group and the second transmission resource group based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle.

[0129] Terminal devices can determine the resource period containing ROs and POs based on the uplink and downlink time-domain resource configurations of the network and the resource configuration of Msg.A. The resource locations and number of ROs and POs remain unchanged in different resource periods. The resource period can also be called the resource pattern period, that is, the time-frequency resource mapping pattern of ROs and POs remains unchanged in different resource periods.

[0130] The first transmission resource group (TRP) consists of a single origin (RO) group and a preamble. An RO group comprises K1 consecutive ROs in the time domain. The K1 ROs in a first TRP group are used to repeatedly transmit the preamble within that group. Different first TRP groups have different RO groups and / or preambles. For example, first TRP 1 consists of RO group 1 and preamble 1, first TRP 2 consists of RO group 1 and preamble 2, and first TRP 3 consists of RO group 2 and preamble 1. Then, first TRP 1 and first TRP 2 have the same RO group but different preambles; first TRP 1 and first TRP 3 have different RO groups but the same preamble; and first TRP 2 and first TRP 3 have different RO groups and different preambles.

[0131] The second transport resource group consists of one point of interest (PO) group and one DMRS resource. A PO group comprises K² consecutive POs in the time domain. The K² POs in a second transport resource group are used for repeated transmission of random access information and DMRS, with the DMRS resource being the DMRS resource within that second transport resource group. A DMRS resource consists of a DMRS port and a DMRS sequence. Different second transport resource groups have different PO groups and / or DMRS resources.

[0132] After determining the resource period, the terminal device can first determine the number of first transmission resources based on the number of Original Routers (ROs) within a resource period and the number of preambles corresponding to each RO. One RO can carry multiple preambles, and the number of preambles corresponding to an RO refers to the number of preambles that an RO can carry. Specifically, the number of first transmission resources can be the product of the number of ROs and the number of preambles corresponding to each RO. The terminal device can also determine the number of second transmission resources based on the number of Original Points (POs) within a resource period and the number of DMRS resources corresponding to each PO. One PO can carry multiple DMRSs, and each DMRS has different resources, such as a different antenna port (which can be called a DMRS port) and / or a different DMRS sequence. The number of DMRS resources corresponding to a PO refers to the number of DMRSs that a PO can carry. Specifically, the number of second transmission resources can be the product of the number of POs and the number of DMRS resources corresponding to each PO. Secondly, the terminal device determines the number N of the first transmission resource group within the resource period based on the number of repeated transmissions K1 of PRACH in Msg.A and the number of first transmission resources. And the terminal device determines the number M of the second transmission resource group within the resource period based on the number of repeated transmissions K2 of PUSCH in Msg.A and the number of second transmission resources within the resource period.

[0133] The terminal equipment determines the first transmission resource group and the second transmission resource group included within the resource period. That is, it determines the grouping of the first transmission resource and the second transmission resource within the resource period.

[0134] In the time domain, every K1 consecutive ROs form an RO group, and ROs belonging to the same RO group have the same frequency domain resources. In one resource period, the RO groups are arranged in ascending order first according to the frequency domain and then according to the time domain. An RO group and a preamble form a first transmission resource group. An RO group and different preambles can form different first transmission resource groups.

[0135] For example Figure 6 As shown, taking a resource period containing 16 ROs and K1 with a value of 2 as an example, for multiple ROs with the same frequency domain resources but different time domain resources, every two consecutive ROs in the time domain form an RO group, such as... Figure 6As shown, RO0, RO4, RO8, and RO12 are four ROs with the same frequency domain resources but different time domain resources. Each pair of consecutive ROs forms an RO group; therefore, RO0 and RO4 belong to the same RO group, and RO8 and RO12 belong to the same RO group. After the terminal device determines the RO grouping, it can determine that the RO groups are first arranged in frequency domain order, then in ascending order of frequency domain resources. Alternatively, the RO groups are first arranged in ascending order of frequency domain resource index, then in ascending order of time domain resource index. The frequency domain resource index can increase sequentially from smallest to largest frequency, and the time domain resource index can increase sequentially from earliest to latest time. For example... Figure 6 As shown, the four RO groups with the smallest time-domain resource index (i.e., the earliest time) are arranged in ascending order of frequency-domain resource index: RO group 0 consists of RO0 and RO4; RO group 1 consists of RO1 and RO5; RO group 2 consists of RO2 and RO6; and RO group 3 consists of RO3 and RO7. The next multiple RO groups with different frequency-domain resources on the time-domain resource are RO group 4 consisting of RO8 and RO12; RO group 5 consisting of RO9 and RO13; RO group 6 consisting of RO10 and RO14; and RO group 7 consisting of RO11 and RO15.

[0136] like Figure 6 In the RO groups shown, one RO group and one preamble form a first transmission resource group. For example, if each RO group corresponds to 4 preambles, then one RO group and each preamble form a first transmission resource group. Figure 6 In the RO groups shown, each RO group corresponds to preamble 0, preamble 1, preamble 2, and preamble 3. For example, RO group 0 and preamble 0 form the first transmission resource group 0; RO group 0 and preamble 1 form the first transmission resource group 1; RO group 0 and preamble 2 form the first transmission resource group 2; and RO group 0 and preamble 3 form the first transmission resource group 3. The other RO groups are similar; each RO group and each of the four preambles forms a first transmission resource group, as shown below. Figure 6 The 8 RO groups and 4 preambles shown together form 32 first transmission resource groups. A terminal device can select one first transmission resource group to transmit PRACH. For example, the terminal device can select first transmission resource group 1, consisting of RO group 0 and preamble 1, to transmit PRACH. PRACH includes RO group 0 and preamble 1. That is, the terminal device repeatedly transmits preamble 1 in RO group 0; specifically, the terminal device transmits preamble 1 on RO0 and RO4 within RO group 0. The terminal device repeats the transmission of preamble 1 twice within RO group 0.

[0137] It should be understood that Figure 6This is merely an example of RO grouping within a resource period provided in this application embodiment. This application does not limit the number of ROs or RO groups included within a resource period.

[0138] In the time domain, every K2 consecutive POs form a PO group, and POs belonging to the same PO group have the same frequency domain resources. In a resource period, the index of the PO group is arranged from small to large first according to the frequency domain order and then according to the time domain order. A PO group and a preamble form a second transmission resource group.

[0139] For example, Figure 7 The resource period shown includes 16 POs, with K2 taking the value of 2. PO0 and PO4 form PO group 0; PO1 and PO5 form PO group 1; PO2 and PO6 form PO group 2; PO3 and PO7 form PO group 3, and so on for other PO groups. However, this application is not limited to this. Figure 7 This is merely an example of a PO group within a resource period provided in this application embodiment. This application does not limit the number of POs or PO groups included within a resource period.

[0140] like Figure 7 In the PO groups shown, one PO group and one DMRS resource form a second transport resource group. For example, if each PO group corresponds to 4 DMRS resources, then one PO group and each DMRS resource form a second transport resource group. Figure 7 The 8 PO groups and 4 DMRS resources shown constitute 32 second transmission resource groups. The terminal device can select one second transmission resource group to repeatedly transmit the PUSCH. The terminal device repeatedly transmits the PUSCH on the PO groups within the selected second transmission resource group. The PUSCH includes random access information and DMRS; that is, the terminal device transmits the random access information and the DMRS used to demodulate the random access information once for each PO in the selected second transmission resource. The random access information and the DMRS carried by different POs in the second transmission resource are the same. The DMRS repeatedly transmitted by the terminal device is sent using the DMRS resources (including the DMRS antenna port and DMRS sequence) in the second transmission resource group; that is, the DMRS is the DMRS sequence sent by the terminal device through the DMRS antenna port, and this DMRS is used to demodulate the random access information. For example, the terminal device can select the second transmission resource group 1, which consists of PO group 0 and DMRS resource 1, to transmit PUSCH. The terminal device repeatedly transmits PUSCH in PO group 0, that is, the terminal device sends random access information on PO0 in PO group 0 and sends the DMRS sequence of DMRS resource 1 using the DMRS port of DMRS resource 1, and sends the random access information on PO4 and sends the DMRS sequence of DMRS resource 1 using the DMRS port of DMRS resource 1.

[0141] After determining the number N of the first transmission resource group and the number M of the second transmission resource group within a resource cycle, the terminal device determines the mapping ratio L of the first transmission resource group and the second transmission resource group based on N and M, wherein the mapping ratio... This indicates that the result of N / M is rounded up. In a resource cycle, L first transmission resource groups correspond to one second transmission resource group.

[0142] Optionally, the terminal device may obtain the number of first transmission resources K1 in the first transmission resource group and the number of second transmission resources K2 in the second transmission resource group through one of the following methods.

[0143] In Method 1, the values ​​of K1 and K2 are predefined. For example, the value of K1 (the number of times the preamble sequence in Msg.A is repeatedly transmitted) and the value of K2 (the number of times the random access information in Msg.A is repeatedly transmitted) in the first transmission resource group can be predefined through protocol predefinition. The terminal device determines the number of the first and second transmission resource groups within a resource period based on the predefined values ​​of K1 and K2, thereby determining the mapping ratio between the first and second transmission resource groups within the resource period.

[0144] Method 2: The network device sends a first indication message to the terminal device, which is used to indicate the first value of K1 and the second value of K2.

[0145] Accordingly, the terminal device receives the first indication information, determines the first value of K1 and the second value of K2 based on the first indication information, and thus determines the mapping ratio between the first transmission resource group and the second transmission resource group within the resource period.

[0146] Optionally, the first indication information may be higher-layer signaling sent by the network device to the terminal device. For example, the first indication information may be an RRC message or a medium access control (MAC) control element (CE) signaling.

[0147] Method 3: The network device sends a second indication message to the terminal device, the second indication message indicating a first value for K1. Accordingly, the terminal device receives the second indication message from the network device, determines the first value for K1 based on the second indication message, and determines the second value for K2 based on the first value for K1.

[0148] Optionally, the terminal device determines the second value of K2 based on the first value of K1 and the second mapping relationship. The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, and the first value of K1 corresponds to the second value of K2 in the second mapping relationship.

[0149] For example, the second mapping relationship can be as shown in Table 1. The second mapping relationship includes the mapping relationship between the four values ​​of K1 and the four values ​​of K2, as shown in Table 1. Specifically, when K1 is 1, K2 is 2; when K1 is 2, K2 is 4; when K1 is 4, K2 is 8; and when K1 is 8, K2 is 16. For instance, the network device indicates that K1 is 4 (i.e., the first value is 4) through the second indication information. After receiving this second indication information, the terminal device determines that K1 is 4. Then, according to the second mapping relationship shown in Table 1, the terminal device determines that K2 is 8 (i.e., the second value is 8). Based on the values ​​of K1 (4) and K2 (8), the terminal device determines the number of the first transmission resource group and the number of the second transmission resource group within the resource period, thereby determining the mapping ratio between the first and second transmission resource groups.

[0150] Table 1

[0151] K1 K2 1 2 2 4 4 8 8 16

[0152] It should be understood that Table 1 is only an example of the second mapping relationship provided in the embodiments of this application. In specific implementations, the values ​​of K1 and K2 can be determined according to the specific implementation situation, and this application does not limit them.

[0153] Optionally, the second mapping relationship can be predefined, or it can be configured by the network device sending configuration information. Accordingly, the terminal device receives the configuration information from the network device and determines the second mapping relationship based on the configuration information. Optionally, the configuration information can be higher-layer signaling, such as RRC messages or MAC CE signaling.

[0154] Method 4: The network device sends a third indication message to the terminal device, which indicates a second value for K2. Accordingly, the terminal device receives the third indication message from the network device, determines the second value for K2 based on the third indication message, and determines the first value for K1 based on the second value for K2.

[0155] Optionally, the terminal device determines the first value of K1 based on the second value of K2 and the second mapping relationship. The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, and the first value of K1 in the second mapping relationship corresponds to the second value of K2.

[0156] For example, as shown in Table 1 above, the network device indicates that the value of K2 is 16 (i.e., the second value is 16) through the third indication information. After receiving the third indication information, the terminal device determines that the value of K2 is 16. Then, according to the second mapping relationship shown in Table 1, the terminal device determines that the value of K1 is 8 (i.e., the first value is 8). Based on the values ​​of K2 (16) and K1 (8), the terminal device determines the number of the first transmission resource group and the number of the second transmission resource group within the resource period, thereby determining the mapping ratio between the first transmission resource group and the second transmission resource group.

[0157] In methods 3 and 4, the second mapping relationship can be, besides being a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, also a mapping relationship between multiple values ​​of K1 and one or more scaling factors (the mapping relationship between the values ​​of K1 and the scaling factors can be many-to-one or one-to-one, and a scaling factor can be uniquely determined based on the value of K1), or a mapping relationship between multiple values ​​of K2 and one or more scaling factors (the mapping relationship between the values ​​of K2 and the scaling factors can be many-to-one or one-to-one, and a scaling factor can be uniquely determined based on the value of K2), or there may be no second mapping relationship, and a scaling factor can be pre-configured for the terminal device or configured by the network for the terminal device. The aforementioned scaling factor is used to indicate the ratio between K1 and K2, or the ratio between K2 and K1. In this case, the network device can indicate K1 to the terminal device, and the terminal device determines K2 based on K1 and the scaling factor; or, the network device can indicate K2 to the terminal device, and the terminal device determines K1 based on K2 and the scaling factor. For example, assuming the scaling factor is the ratio between K1 and K2, and the scaling factor is 0.5, if the network device indicates that K1 is 4 for the terminal device, then the terminal device can determine that K2 = K1 / 0.5 = 4 / 0.5 = 8.

[0158] According to the above scheme, the terminal device and the network device can determine the number of first transmission resources in the first transmission resource group and the number of second transmission resources in the second transmission resource group, so that the terminal device and the network device can reach a consensus and improve the reliability of random access messages.

[0159] S502, the terminal device and the network device respectively determine the first mapping relationship according to the mapping ratio L, in which L first transmission resource groups correspond to one second transmission resource group.

[0160] After determining the mapping ratio L, the terminal device determines the mapping relationship between the first transmission resource group and the second transmission resource group, i.e., the first mapping relationship, based on the mapping ratio.

[0161] It should be noted that the step numbers in this embodiment are not intended to limit the order of the steps; the order of the steps is determined by their logical relationships. For example, this application does not limit the order in which the network device executes S502 and the terminal device executes S502. For instance, the network device can execute S502 before S501. The network device can determine the mapping ratio between the first transmission resource group and the second transmission resource group according to network requirements, and determine the first mapping relationship between the first transmission resource group and the second transmission resource group according to the mapping ratio.

[0162] The network device can also determine the number of first transmission resources and the number of second transmission resources in each resource cycle based on the mapping ratio, and notify the terminal device so that the terminal device can determine the number of first transmission resource groups and the number of second transmission resource groups based on the number of first transmission resources, the number of second transmission resources, and K1 and K2, thereby determining the first mapping relationship. This allows the network device and the terminal device to reach a consensus on the first mapping relationship. The following description uses the terminal device determining the first mapping relationship as an example; the method by which the network device determines the first mapping relationship is the same as that of the terminal device, and will not be repeated here for brevity.

[0163] Optionally, the terminal device determines the first mapping relationship based on the mapping ratio and mapping rules. The mapping rules stipulate that every L first transmission resource groups are sequentially mapped to one second transmission resource group, according to the order of the first and second transmission resource groups.

[0164] In a resource cycle, the first transport resource group is arranged in the following order:

[0165] For the first transmission resource group with the same RO group, the first transmission resource group is arranged in ascending order according to the preamble index;

[0166] For the first transmission resource groups with different RO groups, the first transmission resource groups are arranged sequentially according to the order of the RO groups. Since the RO groups are arranged in the order of frequency domain first and then time domain, that is, RO groups with the same time domain resources but different frequency domain resources are arranged in order of frequency domain resources from smallest to largest, and RO groups with the same frequency domain resources but different frequency domain resources are arranged in order of time domain resources from smallest to largest. Therefore, for the first transmission resource groups with different RO groups, they are arranged sequentially in the order of the RO groups, first in the frequency domain and then in the time domain.

[0167] In a resource cycle, the second transport resource group is arranged in the following order:

[0168] First, sort them in ascending order of frequency domain resources according to PO group;

[0169] Secondly, within a PO group, the DMRS resources are arranged in ascending order of their indexes. Each PO group is used to carry multiple DMRSs, and the DMRS resources of these multiple DMRSs belong to different second transport resource groups.

[0170] Finally, sort them in ascending order according to the time-domain resource index of the PO group.

[0171] In other words, the PO groups are arranged first according to the frequency domain resource order, then the DMRS resource index order, and finally the time domain resource order.

[0172] Optionally, a DMRS resource consists of a DMRS port and a DMRS sequence. The indices of the DMRS resources are arranged first according to the index order of the DMRS ports and then according to the index order of the DMRS sequences. That is, for DMRS resources with the same DMRS sequence, the indices of the DMRS resources increase sequentially from the smallest to the largest DMRS port index; for DMRS resources with the same DMRS port, the indices increase sequentially from the smallest to the largest DMRS sequence index.

[0173] The terminal device first determines the arrangement order of the first transmission resource group and the second transmission resource group, and then determines the first mapping relationship between the first transmission resource group and the second transmission resource group according to the mapping ratio.

[0174] like Figure 8 As shown, one RO group corresponds to 64 preambles. That is, one RO group and each of the 64 preambles form a first transmission resource group, resulting in 64 first transmission resource groups. The first transmission resource groups are arranged in the following order: First, within an RO group, the first transmission resources (i.e., the first transmission resources with the same RO group) are arranged in ascending order according to the preamble index within that group. Second, they are arranged in ascending order according to the RO group index. Specifically, the first RO group (RO group 0) contains 64 preambles, from preamble 0 to preamble 63. Then, RO group 1 contains 64 preamble sequences, from preamble 65 to preamble 127. RO group 2 contains 64 preamble sequences, from preamble 128 to 191, and so on, arranging the 64 preamble sequences in each RO group according to the RO group order. If the index order of the RO groups increases sequentially according to the arrangement order of the RO groups, the first transmission resource group with RO group index i and preamble index j is denoted as A. i,j The order of the first transmission resource group is as follows: A 0,0 A 0,1 A 0,2 A 0,64 A 1,0 A1,1 A 1,2 A 1,64 A 2,0 A 2,1 A 2,2 A 2,64 A 3,0 A 7,64 .

[0175] like Figure 8 As shown, one PO group corresponds to 8 DMRSs. That is, one PO group and each preamble in the 8 DMRSs form a second transmission resource group. Therefore, one PO group and 8 DMRSs together form 8 second transmission resource groups. The second transmission resource groups are arranged in the above order. First, the second transmission resource groups are arranged in ascending order of the frequency domain resources of the PO groups. That is, after arranging one DMRS resource in the first PO group, the second DMRS resource is arranged in the second PO group, such as... Figure 8 As shown, the first second transmission resource group consists of PO group 0 and DMRS0 (i.e., the DMRS resource with index 0), the second second transmission resource group consists of PO group 1 and DMRS0, and so on. The eighth second transmission resource group consists of PO group 7 and DMRS0, and the ninth second transmission resource group consists of PO group 0 and DMRS1 (i.e., the DMRS resource with index 1). Within each PO group, the second transmission resource groups are arranged in ascending order of the DMRS resource index. A DMRS resource consists of a DMRS port and a DMRS sequence; therefore, the DMRS resources are first arranged according to the DMRS port index order, and then according to the DMRS sequence index order. After each of the eight PO groups in the frequency domain multiplexing has eight second transmission resource groups, the second transmission resource groups are then arranged in ascending order of the time domain resource index of the PO group. That is, as... Figure 8 After arranging 8 second transmission resources in each of the PO groups 0 to 7, the second transmission resource groups are then sorted in the next time-domain resource of the FDM's 8 PO groups, namely PO groups 8 to PO groups 15. If the index order of the PO groups increases sequentially according to the arrangement order of the PO groups, the second transmission resource group with PO group index i and DMRS resource index j is denoted as B. i,j The order of the first transmission resource group is as follows: B 0,0 B 1,0 B 2,0 B 7,0 B 0,1 B 1,1 B 2,1 B 7,1 B 0,2 B 1,2 B 2,2 B7,2 B 0,7 B 1,7 B 2,7 …, B 7,7 .

[0176] After determining the order of the first and second transmission resource groups, the terminal device determines the first mapping relationship between the first and second transmission resource groups based on the mapping ratio. For example, if the terminal device determines the mapping ratio L to be 1 in S501, then the terminal device will sequentially map each first transmission resource group to one second transmission resource group according to the order of the first and second transmission resource groups. Figure 8 In this process, the terminal device can determine the first first transmission resource group A. 0,0 The first transmission resource group consists of RO group 0 and preamble 0, and this first transmission resource group is related to the first second transmission resource group B. 0,0 (corresponding to the second transmission resource group consisting of PO group 0 and DMRS0); the second first transmission resource group A 0,1 The first transmission resource group A consists of RO group 0 and preamble 1. 0,1 With the second second transport resource group B 1,0 (That is, the second transmission resource group consisting of PO group 1 and DMRS0) corresponds to this; and so on, the eighth first transmission resource group A 0,7 The first transmission resource group (A) consists of RO group 0 and preamble 7. 0,8 With the eighth second transport resource group B 7,0 (That is, the second transmission resource group consisting of PO group 7 and DMRS0). The ninth first transmission resource group A. 0,9 The first transmission resource group A consists of RO group 0 and preamble 9. 0,9 With the Ninth Second Transmission Resource Group B 0,1 (That is, the second transmission resource group consisting of PO group 0 and DMRS1) corresponds to this. Similarly, the first transmission resource group and the second transmission resource group correspond sequentially. The terminal device can select a pair of corresponding first and second transmission resource groups in the first mapping relationship to transmit the PRACH (PRACH includes the RO group and preamble) and PUSCH (PUSCH includes random access information and DMRS) in Msg.A respectively.

[0177] S503, the terminal device sends a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group corresponding to the first transmission resource.

[0178] In other words, in the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource carrying the first random access information.

[0179] For example, the first mapping relationship is as follows Figure 8 As shown, the terminal device selects the first transmission resource consisting of RO group 0 and preamble 10, and the second transmission resource consisting of PO group 2 and DMRS1, from the first mapping relationship to transmit Msg.A. The terminal device repeatedly transmits preamble 10 (an example of the first preamble) on each RO in RO group 0, and repeatedly transmits PUSCH on each PO in PO group 2. The PUSCH includes first random access information and DMRS, where the DMRS is the DMRS sequence corresponding to DMRS1 transmitted using the antenna port corresponding to DMRS1. This DMRS is used to demodulate the first random access information.

[0180] Accordingly, the network device receives the random access message from the terminal device. Specifically, the network device detects a preamble sequence on each RO group. If a first preamble from the terminal device is detected on an RO group, the network device receives the first random access information and DMRS from the terminal device on the second transmission resource group corresponding to the first transmission resource group formed by the first preamble and the RO group, according to the first mapping relationship, and demodulates the first random access information according to the DMRS.

[0181] According to the above scheme, the terminal device can determine the mapping ratio between the first and second transmission resource groups based on the number of the first and second transmission resource groups within a resource cycle. This mapping ratio determines the first mapping relationship between the first and second transmission resource groups, enabling the terminal device and network device to reach a consensus on the first mapping relationship. The first transmission resource group includes multiple consecutive Remote Routers (ROs) in the time domain, and the second transmission resource group includes multiple consecutive Remote Points (POs) in the time domain. This allows the terminal device to repeatedly transmit the preamble in Msg.A on multiple consecutive ROs in the time domain and repeatedly transmit the random access information in Msg.A on multiple consecutive POs in the corresponding time domain. This enhances the coverage of data transmission during random access and meets the reliability requirements of random access messages.

[0182] Figure 9 This is a schematic flowchart of a communication device 900 provided in an embodiment of this application. The communication device 900 includes a processing module 901 and a transceiver module 902.

[0183] In one embodiment, the communication device 900 corresponds to the terminal device in the above method embodiments, and is used to perform the steps performed by the terminal device in the above method embodiments or to implement the functions of the terminal device in the above method embodiments.

[0184] When the communication device 900 corresponds to the aforementioned terminal device, the processing module 901 is used to determine the mapping ratio L between the first transmission resource group and the second transmission resource group based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The PO is used to carry random access information, and the demodulation reference signal resource is used to demodulate the random access information. L, K1, and K2 are all positive integers.

[0185] The processing module 901 is further configured to determine a first mapping relationship based on the mapping ratio, wherein L of the first transmission resource groups correspond to one of the second transmission resource groups in the first mapping relationship;

[0186] The transceiver module 902 is used to send a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0187] The communication device can be a chip configured in a terminal device. When the communication device is a chip configured in a terminal device, the transceiver module 902 can be an input / output interface, and the processing module 901 can be the logic circuit of the chip. Optionally, the communication device may further include a storage module for storing program instructions. The processing module 901 can be used to execute the program instructions stored in the storage unit to enable the transceiver module 902 to implement the random access method provided in the embodiments of this application.

[0188] In another embodiment, the communication device 900 corresponds to the network device in the above method embodiment, and is used to perform the steps performed by the network device in the above method embodiment or to implement the functions of the network device in the above method embodiment.

[0189] When the communication device 900 corresponds to the aforementioned network device, the processing module 901 is used to determine a first mapping relationship based on the mapping ratio between the first transmission resource group and the second transmission resource group within a resource period. In the first mapping relationship, L first transmission resource groups correspond to one second transmission resource group. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The PO is used to carry random access information, and the demodulation reference signal resource is used to demodulate the random access information. L, K1, and K2 are all positive integers.

[0190] The transceiver module 902 is used to receive a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

[0191] The communication device can be a chip configured in a network device. When the communication device is a chip configured in a network device, the transceiver module 902 can be an input / output interface, and the processing module 901 can be the logic circuit of the chip. Optionally, the communication device may further include a storage module for storing program instructions. The processing module 901 can be used to execute the program instructions stored in the storage unit to enable the transceiver module 902 to implement the random access method provided in the embodiments of this application.

[0192] The communication device provided in this embodiment can be used to execute the technical solutions of the above method embodiments. Its implementation principle and technical effects are similar, and will not be described again here.

[0193] Figure 10 This is a schematic diagram of the structure of a terminal device provided in an embodiment of the present invention, such as... Figure 10 As shown, the terminal device 1000 in this embodiment includes a processor 1001, a memory 1002, and a transceiver 1003. The transceiver 1003 is used to receive or send information, and the memory 1002 is used to store computer execution instructions. The processor 1001 is used to execute the computer execution instructions stored in the memory 1002 and control the transceiver to receive or send information, thereby implementing the various steps performed by the terminal device in the random access method provided in the above embodiment. For details, please refer to the relevant descriptions in the foregoing method embodiments.

[0194] Alternatively, the memory 1002 can be either standalone or integrated with the processor 1001.

[0195] When the memory 1002 is set up independently, the terminal device also includes a bus 1003 for connecting the memory 1002 and the processor 1001.

[0196] The terminal device provided in this application embodiment can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar, and will not be described again here.

[0197] Figure 11 This is a schematic diagram of the structure of a network device provided in an embodiment of the present invention, such as... Figure 11 As shown, the network device 1100 in this embodiment includes: a processor 1101, a memory 1102, and a transceiver 1103; wherein, the transceiver 1103 is used to receive or send information, and the memory 1102 is used to store computer execution instructions. The processor 1101 is used to execute the computer execution instructions stored in the memory 1102 and control the transceiver 1103 to receive or send information, so as to implement the various steps performed by the network device in the random access method provided in the above embodiment. For details, please refer to the relevant descriptions in the foregoing method embodiments.

[0198] Alternatively, the memory 1102 can be either standalone or integrated with the processor 1101.

[0199] When the memory 1102 is set up independently, the network device also includes a bus 1103 for connecting the memory 1102 and the processor 1101.

[0200] The network device provided in this application embodiment can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar, and will not be described again here.

[0201] This application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the random access method provided in the above embodiments.

[0202] This application embodiment may also provide a computer program product that can be executed by a processor. When the computer program product is executed, the random access method provided in the above embodiments can be implemented.

[0203] The communication device, computer-readable storage medium, and computer program product of this application embodiment can execute the method executed by the terminal device described above. The specific implementation process and beneficial effects are described above and will not be repeated here.

[0204] All or part of the steps in the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a readable memory. When the program is executed, it performs the steps of the above-described method embodiments; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid-state drive, magnetic tape, floppy disk, optical disk, and any combination thereof.

[0205] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processing unit of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0206] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0207] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0208] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A random access method, characterized by, include: Based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle, the mapping ratio L between the first transmission resource group and the second transmission resource group is determined. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The second transmission resource group is used to carry random access information. L, K1, and K2 are all positive integers. Based on the mapping ratio L, a first mapping relationship is determined. The first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In the first mapping relationship, L first transmission resource groups correspond to one second transmission resource group. Send a random access message, the random access message including a first preamble and first random access information, the first preamble being repeatedly transmitted on K1 ROs of a first transmission resource group, the first random access information being repeatedly transmitted on K2 POs of a second transmission resource group, and the first transmission resource group carrying the first preamble corresponding to the second transmission resource group carrying the first random access information in the first mapping relationship.

2. The method of claim 1, wherein, Determining the first mapping relationship based on the mapping ratio L includes: The first mapping relationship is determined according to the mapping ratio L and the mapping rule, wherein the mapping rule is that every L first transmission resource groups are sequentially matched with one second transmission resource group according to the arrangement order of the first transmission resource groups and the arrangement order of the second transmission resource groups.

3. The method according to claim 1 or 2, characterized in that, In one resource period, every K1 consecutive ROs in the time domain form an RO group, and ROs belonging to the same RO group have the same frequency domain resources. In one resource period, the RO groups are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One RO group and one preamble form one first transmission resource group.

4. The method of claim 3, wherein, For the first transmission resource group with the same RO group, the first transmission resource group is arranged in ascending order according to the index of the preamble; For different first transmission resource groups of RO groups, the first transmission resource groups are arranged sequentially according to the order of the RO groups.

5. The method according to any one of claims 1 to 4, characterized in that, In one resource period, every K2 consecutive POs in the time domain form a PO group, and POs belonging to the same PO group have the same frequency domain resources. In one resource period, the PO groups are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One PO group and one demodulation reference signal resource form a first transmission resource group.

6. The method of claim 5, wherein, In one resource cycle, the second transmission resource group is arranged in the following order: First, the frequency domain resources of the PO group are arranged in ascending order; Secondly, in one of the PO groups, the demodulation reference signal resources are arranged in ascending order of their indexes, wherein each of the PO groups is used to carry multiple demodulation reference signals, and the demodulation reference signal resources of the multiple demodulation reference signals belong to different second transmission resource groups. Finally, the resources of the PO group are sorted in ascending order according to their time domain.

7. The method of claim 6, wherein, One of the demodulation reference signal resources consists of a demodulation reference signal port and a demodulation reference signal sequence. For demodulation reference signal resources with the same demodulation reference signal sequence, the index of the demodulation reference signal resource increases sequentially in ascending order of the index of the demodulation reference signal port; For demodulation reference signal resources with different demodulation reference signal sequences, the index of the demodulation reference signal resource increases sequentially in ascending order of the index of the demodulation reference signal sequence.

8. The method according to any one of claims 1 to 7, characterized in that, K1 and K2 are predefined; or, The method further includes: Receive first indication information from the network device, the first indication information being used to indicate a first value of K1 and a second value of K2.

9. The method according to any one of claims 1 to 7, characterized in that, The method further includes: Receive a second indication information from the network device, the second indication information being used to indicate a first value of K1; Based on the first value of K1, determine the second value of K2; or, Receive third indication information from the network device, the third indication information being used to indicate a second value of K2; The first value of K1 is determined based on the second value of K2.

10. The method according to claim 9, characterized in that, The step of determining the second value of K2 based on the first value of K1 includes: Based on the first value of K1 and the second mapping relationship, determine the second value of K2; or, The step of determining the first value of K1 based on the second value of K2 includes: Based on the second value of K2 and the second mapping relationship, determine the first value of K1. The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, wherein the first value corresponds to the second value in the second mapping relationship.

11. The method of claim 10, wherein, The second mapping relationship is predefined, or the method further includes: Receive configuration information from a network device, the configuration information being used to configure the second mapping relationship.

12. A random access method, comprising: include: A first mapping relationship is determined based on the mapping ratio L between the first transmission resource group and the second transmission resource group within the resource period. The first mapping relationship is used to indicate the mapping relationship between the first transmission resource group and the second transmission resource group. In the first mapping relationship, L first transmission resource groups correspond to one second transmission resource group. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The second transmission resource group is used to carry random access information. L, K1, and K2 are all positive integers. A random access message is received, the random access message including a first preamble and first random access information, the first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group, and the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information in the first mapping relationship.

13. The method of claim 12, wherein, The step of determining the first mapping relationship based on the mapping ratio L between the first transmission resource group and the second transmission resource group within the resource cycle includes: The first mapping relationship is determined based on the mapping ratio L and the mapping rule. The mapping rule is that, according to the order of the first transmission resource group and the order of the second transmission resource group, every L first transmission resource groups are sequentially matched with one second transmission resource group.

14. The method according to claim 12 or 13, characterized in that, In one resource period, every K1 consecutive ROs in the time domain form an RO group, and ROs belonging to the same RO group have the same frequency domain resources. In one resource period, the RO groups are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One RO group and one preamble form one first transmission resource group.

15. The method according to claim 14, characterized in that, For the first transmission resource group with the same RO group, the first transmission resource group is arranged in ascending order of the preamble index; For different first transmission resource groups of RO groups, the first transmission resource groups are arranged sequentially according to the order of the RO groups.

16. The method according to any one of claims 12 to 15, characterized in that, In one resource period, every K2 consecutive POs in the time domain form a PO group, and POs belonging to the same PO group have the same frequency domain resources. In one resource period, the PO groups are arranged from smallest to largest according to the frequency domain order and then according to the time domain order. One PO group and one demodulation reference signal resource form a second transmission resource group.

17. The method of claim 16, wherein, In one resource cycle, the second transmission resource group is arranged in the following order: First, the frequency domain resources of the PO group are arranged in ascending order; Secondly, in one of the PO groups, the demodulation reference signal resources are arranged in ascending order of their indexes, wherein each of the PO groups is used to carry multiple demodulation reference signals, and the demodulation reference signal resources of the multiple demodulation reference signals belong to different second transmission resource groups. Finally, the resources of the PO group are sorted in ascending order according to their time domain.

18. The method of claim 17, wherein, One of the demodulation reference signal resources consists of a demodulation reference signal port and a demodulation reference signal sequence. For demodulation reference signal resources with the same demodulation reference signal sequence, the index of the demodulation reference signal resource increases sequentially in ascending order of the index of the demodulation reference signal port; For demodulation reference signal resources with different demodulation reference signal sequences, the index of the demodulation reference signal resource increases sequentially in ascending order of the index of the demodulation reference signal sequence.

19. The method according to any one of claims 12 to 18, characterized in that, K1 and K2 are predefined; or, The method further includes: Determine the first value of K1 and the second value of K2; Send a first indication message, which is used to indicate a first value of K1 and a second value of K2.

20. The method of any one of claims 12-18, wherein, The method further includes: Determine the first value of K1 and the second value of K2; Send a second indication message, which indicates the first value of K1, or send a third indication message, which indicates the second value of K2.

21. The method of claim 19 or 20, wherein, Determining the first value of K1 and the second value of K2 includes: Based on the second mapping relationship, determine the first value of K1 and the second value of K2. The second mapping relationship is a mapping relationship between multiple values ​​of K1 and multiple values ​​of K2, wherein the first value corresponds to the second value in the second mapping relationship.

22. The method of claim 21, wherein, The second mapping relationship is predefined, or the method further includes: Determine the second mapping relationship. Send configuration information, which is used to configure the second mapping relationship.

23. A communications device, characterized by include: The processing module is used to determine the mapping ratio L between the first transmission resource group and the second transmission resource group based on the number of the first transmission resource group and the number of the second transmission resource group in a resource cycle. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The PO is used to carry random access information, and the demodulation reference signal resource is used to demodulate the random access information. L, K1, and K2 are all positive integers. The processing module is further configured to determine a first mapping relationship based on the mapping ratio, wherein L first transmission resource groups correspond to one second transmission resource group in the first mapping relationship; The transceiver module is used to send a random access message, which includes a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

24. A communications device, characterized by include: The processing module is used to determine a first mapping relationship based on the mapping ratio between the first transmission resource group and the second transmission resource group within a resource period. In the first mapping relationship, L first transmission resource groups correspond to one second transmission resource group. The first transmission resource group consists of K1 consecutive physical random access channel transmission opportunities RO in the time domain and a preamble. The second transmission resource group consists of K2 consecutive uplink shared channel transmission opportunities PO in the time domain and a demodulation reference signal resource. The PO is used to carry random access information, and the demodulation reference signal resource is used to demodulate the random access information. L, K1, and K2 are all positive integers. The transceiver module is used to receive random access messages, which include a first preamble and first random access information. The first preamble is repeatedly transmitted on K1 ROs of a first transmission resource group, and the first random access information is repeatedly transmitted on K2 POs of a second transmission resource group. In the first mapping relationship, the first transmission resource group carrying the first preamble corresponds to the second transmission resource group carrying the first random access information.

25. A communication device, characterized in that, include: Processor and memory; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the communication device to perform the method of any one of claims 1 to 11, or the method of any one of claims 12 to 22.

26. A chip, characterized by Includes at least one logic circuit and an input / output interface; The logic circuit is used to control the input / output interface and execute the method of any one of claims 1 to 11, or execute the method of any one of claims 12 to 22.

27. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method of any one of claims 1 to 11, or to implement the method of any one of claims 12 to 22.

28. A computer program product, characterised in that, Includes instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 11, or the method of any one of claims 12 to 22.

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