Communication method and device and storage medium

Abstract

The embodiment of the invention provides a communication method and device and a storage medium, in the method, terminal equipment sends indication information to network equipment, and the indication information indicates the network equipment to send a second reference signal; and the network equipment determines at least one second reference signal based on the first reference signal associated with the first access resource and sends the at least one second reference signal to the terminal equipment, and the terminal equipment initiates random access based on the at least one second reference signal. The terminal equipment triggers the network equipment to send the high-frequency second reference signal through the indication information, so that the network equipment only needs to send part of the high-frequency second reference signal, and the system overhead is reduced.

Description

Technical Field

[0001] This application belongs to the field of communication technologies, and particularly relates to a communication method, apparatus, and storage medium. Background Art

[0002] When a terminal device accesses a new radio (NR) network, it needs to go through processes such as cell search, obtaining system information, and random access. The terminal device learns about the cell information through the system information of the cell, so as to ensure correct operation within the cell after accessing the cell. During the cell search process, the network device needs to continuously send synchronization signal / physical broadcast channel block (SSB) in each beam direction so that the terminal device can search for the SSB. The terminal device can obtain downlink synchronization, physical cell identifier (PCI), and new system information of the cell through the SSB.

[0003] As the communication frequency increases, the number of communication beams will increase significantly. If the network device needs to continuously send SSB in each beam direction, it will result in a large system overhead. Summary of the Invention

[0004] This application relates to a communication method, apparatus, and storage medium, which can reduce system overhead.

[0005] In a first aspect, an embodiment of this application provides a communication method, including:

[0006] Sending indication information, where the indication information instructs the network device to send a second reference signal;

[0007] Receiving at least one second reference signal;

[0008] Initiating random access based on the at least one second reference signal.

[0009] In a possible implementation manner, receiving the at least one second reference signal within a first time window, where a start moment of the first time window is after a sending moment of the indication information.

[0010] In a possible implementation manner, the initiating random access based on the at least one second reference signal includes:

[0011] Determining a third reference signal based on the at least one second reference signal, where the third reference signal is a reference signal whose signal quality in the at least one second reference signal meets a preset condition;

[0012] Initiate random access based on the third reference signal.

[0013] In a possible implementation, the initiating random access based on the third reference signal includes:

[0014] Receive second system information at the frequency point where the third reference signal is located;

[0015] Initiate random access based on the second system information.

[0016] In a possible implementation, the method further includes:

[0017] Receive first system information, where the first system information includes a first association relationship, the first association relationship being the association relationship between the index of the first reference signal and the first access resource, and the frequency point where the first reference signal is located is lower than the frequency point where the second reference signal is located;

[0018] The sending of the indication information includes:

[0019] Send the indication information on the first access resource.

[0020] In a possible implementation, the initiating random access based on the third reference signal includes:

[0021] Initiate random access on a second access resource associated with the third reference signal, where the time-frequency position of the second access resource associated with the third reference signal is determined based on resource configuration information.

[0022] In a possible implementation, the first system information further includes a second association relationship and the resource configuration information, the second association relationship including the association relationship between the index of the second reference signal and the second access resource, and the resource configuration information being the configuration information of the second access resource.

[0023] In a possible implementation, the first system information further includes a second association relationship, the second association relationship including the association relationship between the index of the second reference signal and the second access resource;

[0024] The initiating random access based on the third reference signal includes:

[0025] Send first information, where the first information is used to feedback the third reference signal;

[0026] Receive resource configuration information, the resource configuration information being the configuration information of the second access resource associated with the third reference signal;

[0027] Initiate random access on the second access resource associated with the third reference signal, where the time-frequency position of the second access resource associated with the third reference signal is determined based on the resource configuration information.

[0028] In a possible implementation manner, the method further includes:

[0029] Receive second information, where the second information is used to trigger the terminal device to send the first information.

[0030] In a second aspect, an embodiment of the present application provides a communication method, including:

[0031] Receive indication information, where the indication information instructs the network device to send a second reference signal;

[0032] Determine at least one second reference signal;

[0033] Send the at least one second reference signal.

[0034] In a possible implementation manner, the method further includes:

[0035] Send first system information, where the first system information includes a first association relationship, and the first association relationship is the association relationship between the index of the first reference signal and the first access resource, and the frequency point where the first reference signal is located is lower than the frequency point where the second reference signal is located;

[0036] The receiving the indication information includes:

[0037] Receive the indication information on the first access resource;

[0038] The determining at least one second reference signal includes:

[0039] Determine the at least one second reference signal based on the first reference signal associated with the first access resource.

[0040] In a possible implementation manner, the first system information further includes a second association relationship, and the second association relationship is the association relationship between the index of the second reference signal and the second access resource.

[0041] In a possible implementation manner, the first system information further includes resource configuration information, and the resource configuration information is the configuration information of the second access resource.

[0042] In a possible implementation manner, the method further includes:

[0043] Receive first information, where the first information is used to feedback a third reference signal, and the third reference signal is a reference signal whose signal quality in the at least one second reference signal meets a preset condition;

[0044] Send resource configuration information, where the resource configuration information is the configuration information of the second access resource associated with the third reference signal.

[0045] In a possible implementation manner, the method further includes:

[0046] Send second information, where the second information is used to trigger the terminal device to send the first information.

[0047] In a third aspect, an embodiment of the present application provides a communication device, including:

[0048] A first sending module, configured to send indication information on a first access resource, where the indication information indicates that the network device sends a second reference signal;

[0049] A first receiving module, configured to receive at least one second reference signal;

[0050] A second sending module, configured to initiate random access based on the at least one second reference signal.

[0051] In a fourth aspect, an embodiment of the present application provides a communication device, including:

[0052] A first receiving module, configured to receive indication information, where the indication information indicates that the network device sends a second reference signal;

[0053] A determining module, configured to determine at least one second reference signal;

[0054] A first sending module, configured to send the at least one second reference signal.

[0055] In a fifth aspect, an embodiment of the present application provides a communication device, including: a processor and a memory;

[0056] The memory stores computer-executable instructions;

[0057] The processor executes the computer-executable instructions stored in the memory to implement the communication method described in the first aspect or the second aspect.

[0058] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a computer, the communication method described in the first aspect or the second aspect is implemented.

[0059] In a seventh aspect, an embodiment of the present application provides a computer program product, including a computer program, and when the computer program is executed by a computer, the communication method described in the first aspect or the second aspect is implemented.

[0060] In an eighth aspect, an embodiment of the present application provides a chip, on which a computer program is stored. When the computer program is executed by the chip, the communication method described in the first aspect or the second aspect is implemented.

[0061] In a possible implementation manner, the chip is a chip in a chip module.

[0062] An embodiment of the present application provides a communication method, device, and storage medium. In this method, a terminal device sends indication information to a network device, and the indication information instructs the network device to send a second reference signal. After receiving the indication information, the network device determines at least one second reference signal and sends at least one second reference signal to the terminal device. The terminal device initiates random access based on the at least one second reference signal. The terminal device triggers the network device to send a high-frequency second reference signal through the indication information, so that the network device only needs to send a part of the high-frequency second reference signals, reducing the system overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a schematic structural diagram of an SSB in the related art;

[0064] Figure 2 It is a schematic diagram of the relationship between a beam and an SSB in the related art;

[0065] Figure 3 It is a schematic diagram of possible SSB positions within one SS burst set period in the related art;

[0066] Figure 4 It is a schematic diagram of the random access process in the related art;

[0067] Figure 5 It is a schematic diagram of an architecture of a communication system provided by an embodiment of the present application;

[0068] Figure 6 It is a schematic diagram of a process of a communication method provided by an embodiment of the present application;

[0069] Figure 7 It is a schematic diagram of a process of another communication method provided by an embodiment of the present application;

[0070] Figure 8 It is an example diagram of the positions of multiple beams provided by an embodiment of the application;

[0071] Figure 9 It is a schematic diagram of the structure of communication device 10 provided by an embodiment of the present application;

[0072] Figure 10 It is a schematic diagram of the structure of communication device 20 provided by an embodiment of the present application;

[0073] Figure 11Schematic diagram of the communication device 30 provided by the embodiments of the present application. Detailed implementation manners

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0075] In the present application, "at least one" means one or more. "A plurality" means two or more.

[0076] The descriptions such as "first" and "second" that appear in the present application are only for indicating and distinguishing the described objects, without an order, and do not particularly limit the number of objects in the embodiments of the present application, and cannot constitute any limitation to the embodiments of the present application. For example, the first reference signal is a reference signal with a lower frequency point, and the second reference signal is a reference signal with a higher frequency point. The use of descriptions such as "first" and "second" is only to distinguish reference signals with different frequency points, rather than indicating differences in the priority or importance of these two reference signals, etc.

[0077] In the present application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to give examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, the use of the word "exemplary" is intended to present concepts in a specific manner.

[0078] To more clearly illustrate the present application, the related technologies involved in the present application will be introduced first below.

[0079] In NR, the initial access function includes: 1. The function and process for a terminal device to initially find a cell when entering the system coverage area. 2. The function and procedure for a terminal device in the idle / inactive state to access the network, usually to request connection establishment, which can be called random access. To a large extent, similar functions are also used in other situations. For example, when a terminal device moves within the system coverage area, the basic network signal used to initially find a cell can also be used to find a new cell. In addition, when a terminal device accesses a new cell, the same basic random access process as that for initial access can be used. The random access process can also be used by a terminal device in the connected state. For example, to request resources for uplink transmission or re-establish uplink synchronization.

[0080] Cell search encompasses the functions and processes for a terminal device to find new cells. Cell search is performed when the terminal device initially enters the coverage area of the system. To enable mobility, devices moving within the system also continuously perform cell search when they are connected to the network and in the idle / inactive state. Taking SSB-based cell search as an example, it can be used for initial cell search and idle / inactive state mobility, and also for connected state mobility.

[0081] To enable the terminal device to find a cell when entering the system and to find new cells when moving within the system, 5G NR introduces a new resource block - the SSB block, which is jointly composed of the primary synchronization signals (PSS), secondary synchronization signals (SSS), and physical broadcast channel (PBCH). Like all NR downlink transmissions, SSB transmission is based on orthogonal frequency division multiplexing (OFDM). That is, SSB is transmitted on a set of time / frequency resources (resource elements) within the basic OFDM grid.

[0082] As Figure 1 shown, the SSB occupies a total of 4 OFDM symbols in the time domain and 240 subcarriers in the frequency domain. The PSS is transmitted in the first OFDM symbol of the SSB and occupies 127 subcarriers in the frequency domain, with the remaining subcarriers being empty. The SSS is transmitted in the third OFDM symbol of the SSB and occupies the same set of subcarriers as the PSS. There are eight and nine empty subcarriers on each side of the SSS. The PBCH is transmitted within the second, third, and fourth OFDM symbols of the SSB; among them, on the second and fourth OFDM symbols, the PBCH occupies 240 subcarriers, and on the third OFDM symbol, the PBCH is transmitted on both sides of the SSS, with 48 subcarriers occupied on each side. Therefore, the total number of resource elements used for PBCH transmission by each SSB is equal to 576.

[0083] The de-modulation reference signal (DMRS) is located within the PBCH mapping area and is a reference signal within the PBCH channel.

[0084] To limit the need for the terminal device to search for SSBs with different parameter sets simultaneously, in many cases, only one SS block parameter set is defined for a given frequency band.

[0085] Table 1

[0086]

[0087]

[0088] Table 1 lists different parameter sets applicable to SSB transmission, the corresponding SSB bandwidth and duration, and the frequency range applicable to each specific parameter set. Regardless of the frequency range, the 60 kHz parameter set cannot be used for SSB transmission. In contrast, the 240 kHz parameter set can be used for SSB transmission, but other downlink transmissions are not currently supported. The reason for supporting the 240 kHz parameter set is because each SSB enables a very short duration. This is related to the case of beam scanning with a large number of beams having a corresponding large amount of time-division multiplexed SSBs.

[0089] In Long Term Evolution (LTE), the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS) are always located at the center of the carrier. Therefore, once an LTE device finds the PSS / SSS, it has found the carrier, and it inherently knows the center frequency of the found carrier. The disadvantage of this method, i.e., always positioning the PSS / SSS at the center of the carrier, forces terminal devices without prior knowledge of the carrier position in the frequency domain to search for the PSS / SSS ("carrier raster") at all possible carrier positions. To allow for faster cell search, NR has adopted a different approach, i.e., not always positioning the PSS / SSS at the center of the carrier, which means that the possible SSB positions coincide with the carrier raster, and within each frequency band, the set of possible SSB positions is more limited, called the "synchronization raster". Terminal devices therefore do not need to search for SSBs at every position in the carrier raster, but only need to search for SSBs on the sparser synchronization raster. Since the carrier can still be located at any position on the denser carrier raster, the SSB may not end up at the center of the carrier. The SSB may not even end up aligned with the resource block grid. Therefore, once an SSB is found, the terminal device must be explicitly notified of the exact frequency domain position of the SSB within the carrier. This is done partly by information in the SSB itself, more specifically, the information carried by the Physical Broadcast Channel (PBCH), and partly in the remaining broadcast system information.

[0090] The SSB is transmitted periodically with a period ranging from 5 milliseconds to 160 milliseconds. However, a terminal device performing initial cell search, and a terminal device in an inactive / idle state performing cell search mobility, can assume that the SSB repeats at least every 20 milliseconds. This allows a terminal device searching for the SSB in the frequency domain to know how long it must stay on each frequency before concluding that there is no PSS / SSS and it should move to the next frequency within the synchronization raster. The 20 ms SSB period is four times the corresponding 5 ms period of LTE PSS / SSS transmission. The longer SSB period is chosen to allow enhanced NR network energy performance and generally follows a lean design paradigm. The disadvantage of the longer SS block period is that the device must stay on each frequency for a longer time to conclude that there is no PSS / SSS on that frequency. However, this can be compensated for by the sparse synchronization raster discussed above, which reduces the number of frequency domain positions on which the terminal device must search for the SSB. Although a terminal device performing initial cell search can assume that the SSB repeats at least every 20 milliseconds, there may be reasons to use a shorter or longer SSB period in some cases:

[0091] (1) A shorter SSB period may be used to search for the device's cell more quickly in the connected mode.

[0092] (2) A longer SSB period can be used to further enhance network energy performance. A terminal device performing initial access may not find a carrier with an SSB period greater than 20 ms. However, such a carrier can still be used by a terminal device in the connected mode, for example, as a secondary carrier in a carrier aggregation scenario.

[0093] It should be noted that a secondary carrier can even be deployed without any SSB.

[0094] A key difference between the SS and the corresponding LTE signal is that beam scanning can be applied to SSB transmission, i.e., the SSB can be transmitted in different beams in a time-division multiplexing manner, as Figure 2 shown.

[0095] The set of SSBs within a beam sweep is called an SS burst set. The SSB period is the time between SSB transmissions within a particular beam, i.e., effectively the periodicity of the SS burst set. Since a terminal device located in a certain downlink beam may only be able to "see" a single SSB and has no knowledge of any other SSBs transmitted from the cell. By applying beamforming to the SSB, the coverage of a single SSB transmission is increased. The beam sweep used for SSB transmission also supports receiver beam sweep for receiving uplink random access transmissions as well as downlink beamforming for random access responses. Although the period of the SS burst set is flexible, with a minimum period of 5 ms and a maximum period of 160 ms, each SS burst set is always restricted to a 5-ms time interval, whether in the first half or the second half of a 10-ms (duration of a radio frame).

[0096] The maximum number of SSBs within an SS burst set is different for different frequency bands:

[0097] (1) For frequency bands below 3 GHz, there can be at most four SSBs within an SS burst set, enabling an SSB beam sweep of up to four beams;

[0098] (2) For frequency bands between 3 GHz and 6 GHz, there can be at most eight SSBs within an SS burst set, allowing beam sweeping of up to eight beams;

[0099] (3) For higher frequency bands (FR2), there can be at most 64 SSBs within an SS burst set, enabling beam sweeping of up to 64 beams.

[0100] For higher frequency bands, there are two reasons why the maximum number of SSBs in the SS burst set and the maximum number of beams that the SSB can sweep across are larger:

[0101] (1) Using a large number of beams with a narrower beam width is generally more relevant to higher frequencies;

[0102] (2) Since the duration of the SSB depends on the SS block parameter set, a large number of SSBs within the SS burst set means a very large SSB overhead for lower frequencies, and 15 or 30 kHz must be used for lower SS block parameter sets.

[0103] The set of possible SSB positions in the time domain varies between different SS block parameter sets. For example, Figure 3shows the possible SSB positions within the SS burst set period for the 15 kHz parameter set. It can be seen that any of the first four time slots may have SSB transmissions. Additionally, there can be at most two SSB transmissions in each time slot, with the first possible SSB position corresponding to symbols 2 to 5 and the second possible SSB position corresponding to symbols 8 to 11. Finally, note that the first and last two OFDM symbols of the time slot are not occupied by SSB transmissions. This allows these OFDM symbols to be used for downlink and uplink control signaling for terminal devices already connected to the network. The same applies to all SS block parameter sets. It should be noted that Figure 3 the shown SSB positions are possible SSB positions, i.e., the SSB does not necessarily Figure 3 transmit at all of the positions shown. If fewer SSBs than the maximum number of SSBs are transmitted, the transmitted SSBs do not have to be transmitted at consecutive SSB positions. Instead, Figure 3 any subset of the set of possible SS block positions shown in Figure 3 can be used for actual SSB transmissions. In the case of having four SSBs within the SS burst set, these SSB positions can be as two SSBs within each of the first two time slots, or as one SSB within each of the

[0104] four time slots shown in

[0105] The PSS and SSS of the SSB depend only on the physical cell identity. Thus, the PSS and SS of all SSBs within a cell are the same, and a terminal device cannot use it to determine the relative position of the acquired SSB within the set of possible SSB positions. For this reason, each SSB, more specifically, the PBCH, includes a "time index" that explicitly provides the relative position of the SSB within the sequence of possible SSB positions. Knowing the relative position of the SSB is important for the following reasons: (1) it enables the terminal device to determine the frame timing; (2) different SSBs (actually different beams) can be associated with different random access channel (RACH) opportunities. This, in turn, is a prerequisite for using network-side beamforming during random access reception.The PSS and SSS are physical signals with specific structures, while the PBCH is a more traditional physical channel on which explicit channel coding information is transmitted. The PBCH carries the master information block (MIB), which contains a small amount of information required by the terminal device to be able to obtain the remaining system information broadcast by the network. The following table lists the information carried in the PBCH. Note that the information carried in the PBCH will vary slightly depending on whether the operator is operating in the lower frequency band (FR1) or the higher frequency band (FR2). As mentioned before, the SSB time index identifies the position of the SSB in the SS burst set. Each SSB has a well-defined position in the SS burst set, which is included in the first half or the second half of the 5 ms frame in sequence. From the SSB time index, combined with the half-frame bit (see below), the terminal device can determine the frame boundary.

[0106] Table 2 Information Carried by PBCH

[0107] Information Number of bits SSB time index 0(FR1) / 3(FR2) Cell barring flag 2 First PDSCH DMRS position 1 SIB1 parameter set 1 SIB1 configuration 8 CRB grid offset 5(FR1) / 4(FR2) Half-frame bit 1 System frame number (SFN) 10 Cyclic redundancy check (CRC) 24

[0108] The SSB time index is provided to the terminal device in two parts: (1) an implicit part, encoded in the scrambling applied to the PBCH; (2) an explicit part, contained in the PBCH payload.

[0109] Eight different scrambling patterns can be used for the PBCH, allowing the implicit indication of up to eight different SSB time indices. This is sufficient for operations below 6 GHz (FR1), where there can be up to 8 SSBs in an SS burst set. For operations in the higher NR frequency range (FR2), up to 64 SSBs can be set in an SS burst, which means three additional bits are required to indicate the SSB time index. These three bits, only required for operations above 10 GHz, are included as explicit information in the PBCH payload.

[0110] The CellBarred flag consists of two bits: the first bit, which can be regarded as the actual cell barred flag, indicates whether the terminal device is allowed to access the cell; assuming the terminal device is not allowed to access the cell, the second bit, also known as the same-frequency reselection flag, indicates whether access to other cells on the same frequency is allowed.

[0111] If it is detected that a cell is barred and access to other cells on the same frequency is not allowed, the terminal device can and should immediately restart cell search on a different carrier frequency. By setting the cell barred flag for the NR operator in an NSA deployment, the network can prevent NR devices from attempting to access the system through the NR operator.

[0112] Assume that the mapping type of DMRS is type A, and the physical downlink share channel (PDSCH) DMRS position indicates the time domain position of the first DMRS symbol.

[0113] The system information block (SIB) 1 parameter set provides information about the subcarrier spacing used for transmitting the so-called SIB1, which is part of the system information. The same parameter set is also used for downlink message 2 and message 4, which are part of the random access procedure. Although NR supports four different parameter sets (15 kHz, 30 kHz, 60 kHz, and 120 kHz) for data transmission, for a given frequency band, only two possible parameter sets are available. Therefore, one bit is sufficient to signal the SIB1 parameter set.

[0114] The SIB1 configuration provides information about the search space, the corresponding control resource set (CORESET), and other physical downlink control channel (PDCCH) related parameters that the terminal device needs to monitor for SIB1 scheduling. The common resource block (CRB) grid offset provides information about the frequency offset between the SSB and the CRB grid. The frequency domain position of the SSB relative to the carrier is flexible and does not even have to be aligned with the carrier CRB grid. However, for SIB1 reception, the terminal device needs to know the CRB grid. Therefore, information about the frequency offset between the SSB and the CRB grid must be provided within the PBCH so that it is available to the terminal device before SIB1 reception. Note that the CRB grid offset only provides the offset between the SSB and the CRB grid. Then, information about the absolute position of the SSB within the entire carrier is provided in SIB1.

[0115] The half-frame bit indicates whether the SSB is located in the first or second 5 ms part of the 10 ms frame. As described above, the half-frame bit, together with the SSB time index, allows the device to determine the unit frame boundary. All the above information, including the CRC, is jointly channel coded and rate matched to fit the PBCH payload of the SSB. Although all the above information is carried in the PBCH and is jointly channel coded and CRC protected, strictly speaking, some information does not belong to the MIB. It is assumed that the MIB is the same within an 80 ms time interval (eight subframes) and for all SSBs within the SS burst set. Therefore, for different SSBs within the SS burst set, the SSB time index, the half-frame bit, and the four least significant bits of the SFN are PBCH information carried outside the MIB.

[0116] System information is a collective term for all general (non-device-specific) information required for the normal operation of a terminal device in a network. Usually, system information is carried in different SIBs, and each SIB consists of different types of system information. In LTE, all system information is periodically broadcast throughout the cell area to make it always available, but it also means that this information is transmitted even when there is no terminal device in the cell. For NR, a different approach is adopted, in which, except for the very limited information carried in the MIB, system information is divided into two parts: SIB1 and other SIBs. Among them, SIB1 is sometimes also called remaining minimum system information (RMSI) and contains the system information that a terminal device needs to know before accessing the system. SIB1 is always periodically broadcast throughout the cell area. An important task of SIB1 is to provide the information required for a terminal device to perform initial random access. SIB1 is provided through normal scheduling PDSCH transmission with a period of 160 milliseconds. As mentioned above, PBCH / MIB provides information about the parameter set used for SIB1 transmission, as well as the search space and the corresponding CORESET for scheduling SIB1. In this CORESET, the terminal device then monitors the scheduling of SIB1, which is indicated by the special system information RNTI (SI-RNTI). Other SIBs (excluding SIB1) contain the system information that a terminal device does not need to know before accessing the system. These SIBs can also be periodically broadcast like SIB1. Alternatively, these SIBs can be transmitted on demand, that is, only when explicitly requested by a connected terminal device. This means that the network can avoid periodically broadcasting these SIBs in a cell where there is currently no terminal device resident, thereby improving the network energy performance.

[0117] Random access

[0118] Once a terminal device finds a cell, it can access the cell, which is done as part of the random access process.

[0119] The random access process is as Figure 4As shown, the terminal device first completes downlink synchronization by reading the MIB and SIB1. By reading SIB1, the terminal determines the resources for sending a preamble to the network device to indicate its intention to access the network, and the terminal sends a random access preamble (i.e., Message 1) to the network device. If the network device correctly receives Message 1, it will send a random access response message (i.e., Message 2) scrambled with a random access radio network temporary identity (RA-RNTI), indicating the received preamble and providing a timing alignment instruction. After sending Message 1, the terminal can use the RA-RNTI to monitor for Message 2 from the network device to descramble the message. Message 2 may contain a timing advance (TA), a temporary cell radio network temporary identity (TC-RNTI), power adjustment, and an indication of the resources for the terminal to send Message 3. Then, the terminal sends its identity and an RRC connection request (i.e., Message 3) to the network device through the uplink scheduling indication in Message 2. Finally, the network device can notify the terminal of the completion of the initial access process through Message 4. Otherwise, the terminal can determine that the initial access process has failed. The purpose of the terminal device and the network device exchanging Message 3 and Message 4 is to avoid potential conflicts caused by multiple terminal devices in the cell simultaneously transmitting the same preamble.

[0120] Once the random access process is completed, the terminal device is in the connected state, and communication between the network devices can continue using normal dedicated transmissions. The basic random access process is also used in other contexts of NR, such as: (1) for handovers when synchronization with a new cell needs to be established; (2) to re-establish uplink synchronization with the current cell if synchronization is lost due to no uplink transmissions from the terminal device for too long; (3) to request uplink scheduling if dedicated scheduling request resources are not configured for the terminal device. Part of the basic random access process is also used during the beam recovery process.

[0121] Beam establishment during initial access

[0122] A key feature of NR initial access is the ability to establish a suitable beam pair during the initial access phase and apply receiver-side analog beam scanning for preamble reception. This is achieved by the possibility of associating different SSB time indices with different RACH opportunities and / or different preamble sequences. Since different SSB time indices correspond to SSB transmissions in different downlink beams, this means that the network will be able to determine the downlink beam in which the corresponding device is located based on the received preamble. This beam can then be used as the initial beam for subsequent downlink transmissions to the device. Additionally, if the association between the SSB time index and the RACH opportunity is such that a given time-domain RACH opportunity corresponds to a specific SSB time index, the network will know in a timely manner when to send a preamble to devices within a specific range, at which time the downlink beam will occur. Assuming beam correspondence, the network can focus the uplink receiver beam in the corresponding direction for beamformed preamble reception. In practice, this means that the receiver beam will sweep across the coverage area, synchronized with the corresponding downlink beam scanning used for SSB transmission. Note that beam scanning for preamble transmission is relevant only when analog beamforming is applied at the receiving end. If digital beamforming is applied, beamformed preamble reception can be performed from multiple directions simultaneously. To associate a specific SSB time index with a specific RACH opportunity and a specific set of preambles, the random access configuration of the cell specifies the number of SSB time indices for each RACH opportunity. This number can be greater than 1, indicating that multiple SSB time indices correspond to a single RACH opportunity. However, it can also be less than 1, indicating that a single SSB time index corresponds to multiple RACH opportunities.

[0123] For ease of understanding, the communication system architecture of the embodiments of the present application will be described below.

[0124] Figure 5 A schematic diagram of an architecture of the communication system provided by the embodiments of the present application. As Figure 5 shown, the architecture includes a network device 501 and a terminal 502.

[0125] The network device in this application is a device with wireless transceiver functions, including but not limited to: evolved Node B (eNB or eNodeB) in Long Term Evolution (LTE), base station (gNodeB or gNB) or multi-transmission and receiving points (M-TRP) in New Radio (NR), base stations in subsequent evolved systems, access nodes in Wireless Fidelity (WiFi) systems, wireless relay nodes, wireless backhaul nodes, etc. The base station can be: macro base station, micro base station, pico base station, small cell, relay station, or balloon station, etc. Multiple base stations can support the networks of the same technology mentioned above, or can also support the networks of different technologies mentioned above. The base station can include one or more co-located or non-co-located TRPs.

[0126] The terminal in this application is a device with wireless transceiver functions. The terminal can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, satellites, etc.). The terminal can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a vehicle-mounted terminal device, a wireless terminal in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, a wearable terminal device, etc. The terminal involved in the embodiments of this application can also be referred to as user equipment (UE), access terminal, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile platform, remote station, remote user equipment, mobile device, wireless communication device, UE agent or UE device, etc. The terminal can also be fixed or mobile.

[0127] As the communication frequency increases, the number of communication beams will increase significantly. If the network device needs to continuously send SSBs in each beam direction, it will result in a large system overhead.

[0128] To solve the above technical problems, the present application provides a communication method. The terminal device triggers the network device to send a high-frequency second reference signal with indication information, and the network device determines at least one high-frequency second reference signal, so that the network device does not need to send all high-frequency reference signals, reducing system overhead.

[0129] Next, the technical solutions shown in the present application will be described in detail through specific embodiments. It should be noted that the following several embodiments can exist independently or be combined with each other. For the same or obvious content, it will not be repeated in different embodiments.

[0130] Figure 6 It is a schematic flowchart of a communication method provided by an embodiment of the present application. Please refer to Figure 6 and the method includes:

[0131] S601. The terminal device sends indication information to the network device, and the indication information instructs the network device to send a second reference signal.

[0132] In other words, the network device receives the indication information sent by the terminal device.

[0133] The second reference signal can be an SSB in the THz band or sub-THz band (such as 100 - 300 GHz).

[0134] After accessing the network device through the first frequency, the terminal device can send indication information to the network device. The first frequency is lower than the frequency of the second reference signal.

[0135] S602. The network device determines at least one second reference signal.

[0136] After the terminal device accesses the network device, the network device can determine the range where the terminal device is located based on the access information of the terminal device, and then determine at least one second reference signal from multiple second reference signals to be sent based on the range where the terminal device is located.

[0137] Specifically, the network device can determine a beam subset from multiple second beams based on the range where the terminal device is located. The beam subset includes at least one second beam, and the coverage range of the beams in the beam subset can include the range where the terminal device is located, and determine the reference signal transmitted in at least one second beam as the second reference signal.

[0138] S603. The network device sends at least one second reference signal to the terminal device.

[0139] In other words, the terminal device receives at least one second reference signal sent by the network device.

[0140] In a possible implementation, the terminal device may receive at least one second reference signal within a first time window, and the start time of the first time window is after the transmission time of the indication information.

[0141] It should be noted that the granularity of time in this application can be a time slot or a symbol.

[0142] S604. The terminal device initiates random access based on at least one second reference signal.

[0143] In a possible implementation, the terminal device may initiate random access in the following manner:

[0144] The terminal device determines a third reference signal based on at least one second reference signal, where the third reference signal is a reference signal among at least one second reference signal whose signal quality meets a preset condition; and initiates random access based on the third reference signal.

[0145] Exemplarily, the preset condition may refer to the received power being greater than or equal to a power threshold. That is, the third reference signal is a reference signal among at least one second reference signal whose received power is greater than or equal to the power threshold.

[0146] The number of third reference signals may be one or more. When the number of third reference signals is multiple, the terminal device may select one from the multiple third reference signals for random access.

[0147] In Figure 6 In the shown embodiment, the terminal device sends indication information to the network device, and the indication information instructs the network device to send a second reference signal; the network device determines at least one second reference signal and sends at least one second reference signal to the terminal device, and the terminal device initiates random access based on at least one second reference signal. The terminal device triggers the network device to send a high-frequency second reference signal through the indication information, so that the network device only needs to send some high-frequency second reference signals, reducing the system overhead.

[0148] Figure 7 It is a schematic flowchart of another communication method provided by the embodiments of this application. Please refer to Figure 7 , and this method includes:

[0149] S701. The network device sends first system information to the terminal device.

[0150] In other words, the terminal device receives the first system information sent by the network device.

[0151] The terminal device may receive the first system information sent by the network device after accessing the network device.

[0152] After the terminal device accesses the network device through the first frequency, it receives the first system information sent by the network device. The first frequency is lower than the frequency of the second reference signal.

[0153] The first system information may include a first association relationship, which is the association relationship between the index of the first reference signal and the first access resource.

[0154] The first association relationship may include the association relationships between the indices of multiple first reference signals and multiple first access resources, and the index of the first reference signal and the first access resource may correspond one by one.

[0155] The first reference signal may be an SSB in the GHz band, such as a band of 100 GHz and below.

[0156] The first access resource may be a RACH occasion or other uplink resource transmission occasions (such as dedicated resources introduced additionally for indication information).

[0157] The first system information may further include the configuration information of multiple first access resources, and the configuration information is used to indicate the time-frequency position of the first access resource.

[0158] S702. The terminal device sends indication information to the network device on the first access resource, and the indication information instructs the network device to send a second reference signal.

[0159] In other words, the network device receives the indication information sent by the terminal device on the first access resource.

[0160] The frequency point where the second reference signal is located is higher than the frequency point where the first reference signal is located, that is, the frequency point where the first reference signal is located is lower than the frequency point where the second reference signal is located.

[0161] The first access resource carrying the indication information is one of the multiple first access resources in the first association relationship.

[0162] Based on the first system information, the terminal device can determine the time-frequency position of the first access resource, and then can send indication information to the network device on the first access resource.

[0163] S703. The network device determines at least one second reference signal based on the first reference signal associated with the first access resource.

[0164] The network device can determine the range where the terminal device is located based on the coverage range of the first beam associated with the first reference signal (that is, the first reference signal is transmitted in the first beam), and then determine at least one second reference signal from multiple second reference signals to be sent based on the range where the terminal device is located.

[0165] S704. The network device sends at least one second reference signal to the terminal device.

[0166] S705. The terminal device initiates random access based on at least one second reference signal.

[0167] It should be noted that the execution processes of S704 to S705 can refer to the execution processes of S603 to S604, which will not be elaborated here.

[0168] In Figure 7 In the illustrated embodiment, the network device sends the first system information, and the first system information includes a first association relationship, where the first association relationship is the association relationship between the index of the first reference signal and the first access resource. After receiving the first system information, the terminal device sends indication information to the network device on the first access resource, and the indication information instructs the network device to send a second reference signal, and the frequency band where the second reference signal is located is higher than the frequency band where the first reference signal is located; the network device determines at least one second reference signal based on the first reference signal associated with the first access resource, and sends at least one second reference signal to the terminal device, and the terminal device initiates random access based on at least one second reference signal. The terminal device triggers the network device to send a high-frequency second reference signal through the indication information, and the network device determines that only some high-frequency second reference signals need to be sent based on the first access resource, reducing the system overhead.

[0169] In Figure 7 Based on the illustrated embodiment, below, in combination with Figure 8 it is described in detail how to determine at least one second reference signal.

[0170] In Figure 8 Among them, the beam with a wider beam width is the first beam, and the beam with a narrower beam width is the second beam. The frequency band where the first beam is located is lower than the frequency band where the second beam is located. Exemplarily, the first beam can be a GHz beam, and the second beam can be a THz beam.

[0171] The terminal device accesses the network device and receives the first system information sent by the network device. The first system information includes a first association relationship, where the first association relationship is the association relationship between the first SSB and the first RACH opportunity. Among them, there are four first SSBs, namely first SSB1, first SSB2, first SSB3, and first SSB4. First SSB1 is associated with RACH opportunity 1, first SSB2 is associated with RACH opportunity 2, first SSB3 is associated with RACH opportunity 3, and first SSB4 is associated with RACH opportunity 4. As Figure 7 shown, first SSB1 is transmitted in the first beam 1, first SSB2 is transmitted in the first beam 2, first SSB3 is transmitted in the first beam 3, and first SSB4 is transmitted in the first beam 4.

[0172] After the terminal device receives the first system information, it sends indication information to the network device on RACH occasion 2. Based on RACH occasion 2, the network device can determine that the terminal device is within the coverage area of the first beam 2. Based on the coverage area of the first beam 2, the network device determines a beam subset among multiple second beams (such as Figure 8 the shaded beams in the figure), and determines the reference signal transmitted on the beams in the beam subset as the second reference signal.

[0173] Based on any of the above embodiments, the following describes in detail how to perform random access in three ways.

[0174] Method 1: The first system information does not include the second association relationship and resource configuration information

[0175] The second association relationship is the association relationship between the index of the second reference signal and the second access resource, and the resource configuration information is the configuration information of the second access resource.

[0176] The second association relationship may include the association relationships between the indices of multiple second reference signals and multiple second access resources, and the index of the second reference signal and the second access resource may be in one-to-one correspondence.

[0177] The second access resource may be a RACH occasion.

[0178] The resource configuration information may indicate the time-frequency position of the second access resource.

[0179] In this method, the terminal device can receive the second system information at the frequency point where the third reference signal is located, and initiate random access based on the second system information.

[0180] The second system information may include the second association relationship and resource configuration information. The terminal device can determine the time-frequency position of the second access resource associated with the third reference signal based on the second system information, and then initiate random access at the determined time-frequency position.

[0181] Method 2: The first system information includes the second association relationship and resource configuration information

[0182] The terminal device can initiate random access on the second access resource associated with the third reference signal. The time-frequency position of the second access resource associated with the third reference signal is determined based on the resource configuration information.

[0183] Specifically, after the terminal device determines the third reference signal, it can determine the time-frequency position of the second access resource associated with the third reference signal based on the second association relationship and resource configuration information, and then initiate random access at the determined time-frequency position.

[0184] Method 3: The second association relationship is included in the first system information

[0185] The terminal device may send first information to the network device. The first information is used to feed back a third reference signal, and the network device sends resource configuration information to the terminal device. The terminal device initiates random access on a second access resource associated with the third reference signal, and the time-frequency position of the second access resource associated with the third reference signal is determined based on the resource configuration information.

[0186] The resource configuration information may be the resource configuration information of the third reference signal or the resource configuration information of multiple second reference signals.

[0187] In a possible implementation manner, after determining the third reference signal, the terminal device may actively report the third reference signal to the network device to obtain corresponding resource configuration information; or the terminal device may also send the first information to the network device after receiving the second information sent by the network device, where the second information is used to trigger the terminal device to send the first information.

[0188] The reception time of the second information may be after the termination time of the first time window.

[0189] It should be noted that the granularity of the time in the embodiments of the present application may be a time slot or a symbol.

[0190] In the embodiments of the present application, the terminal device triggers the network device to send a high-frequency second reference signal through a low-frequency first access resource, so that the network device only needs to send a part of the high-frequency second reference signals, reducing the system overhead.

[0191] Figure 9 It is a schematic structural diagram of a communication device 10 provided in an embodiment of the present application. Please refer to Figure 9 and the device 10 includes:

[0192] A first sending module 11, configured to send indication information, where the indication information indicates that the network device sends a second reference signal;

[0193] A first receiving module 12, configured to receive at least one second reference signal;

[0194] A second sending module 13, configured to initiate random access based on at least one second reference signal.

[0195] In a possible implementation manner, at least one second reference signal is received within a first time window, where the start time of the first time window is after the sending time of the indication information.

[0196] In a possible implementation manner, the second sending module 13 is specifically configured to:

[0197] Determine a third reference signal based on at least one second reference signal, where the third reference signal is a reference signal among the at least one second reference signal whose signal quality meets a preset condition;

[0198] Initiate random access based on the third reference signal.

[0199] In a possible implementation manner, the second sending module 13 is specifically configured to:

[0200] Receive second system information at the frequency point where the third reference signal is located;

[0201] Initiate random access based on the second system information.

[0202] In a possible implementation manner, the apparatus 10 further includes:

[0203] A second receiving module, configured to receive first system information, where the first system information includes a first association relationship, and the first association relationship is an association relationship between the index of a first reference signal and a first access resource, and the frequency point where the first reference signal is located is lower than the frequency point where the second reference signal is located;

[0204] The second sending module 13 is specifically configured to:

[0205] Send the indication information on the first access resource.

[0206] In a possible implementation manner, the second sending module 13 is specifically configured to:

[0207] Initiate random access on a second access resource associated with the third reference signal, where the time-frequency position of the second access resource associated with the third reference signal is determined based on resource configuration information.

[0208] In a possible implementation manner, the first system information further includes a second association relationship and resource configuration information, the second association relationship includes an association relationship between the index of a second reference signal and a second access resource, and the resource configuration information is configuration information of the second access resource.

[0209] In a possible implementation manner, the first system information further includes a second association relationship, and the second association relationship includes an association relationship between the index of a second reference signal and a second access resource; the second sending module 13 is specifically configured to:

[0210] Send a first message, where the first message is used to feedback the third reference signal;

[0211] Receive resource configuration information, where the resource configuration information is configuration information of a second access resource associated with the third reference signal;

[0212] Initiate random access on the second access resource associated with the third reference signal, and the time-frequency position of the second access resource associated with the third reference signal is determined based on the resource configuration information.

[0213] In a possible implementation manner, the apparatus 10 further includes:

[0214] A third receiving module, configured to receive second information, where the second information is used to trigger the terminal device to send first information.

[0215] The communication apparatus 10 may execute the steps performed by the terminal in the foregoing method embodiments, and the implementation principles and beneficial effects are similar, and will not be elaborated herein.

[0216] Figure 10 This is a schematic structural diagram of the communication apparatus 20 provided in the embodiments of the present application. As Figure 10 shown, the apparatus 20 includes:

[0217] A first receiving module 21, configured to receive indication information, where the indication information indicates that the network device sends a second reference signal;

[0218] A determining module 22, configured to determine at least one second reference signal;

[0219] A first sending module 23, configured to send at least one second reference signal.

[0220] In a possible implementation manner, the apparatus 20 further includes:

[0221] A second sending module, configured to send first system information, where the first system information includes a first association relationship, and the first association relationship is an association relationship between the index of the first reference signal and the first access resource, and the frequency band where the first reference signal is located is lower than the frequency band where the second reference signal is located;

[0222] The first receiving module 21 is specifically configured to: receive the indication information on the first access resource;

[0223] The determining module 22 is specifically configured to: determine at least one second reference signal based on the first reference signal associated with the first access resource.

[0224] In a possible implementation manner, the first system information further includes a second association relationship, and the second association relationship is an association relationship between the index of the second reference signal and the second access resource.

[0225] In a possible implementation manner, the first system information further includes resource configuration information, and the resource configuration information is the resource configuration information of the second access resource.

[0226] In a possible implementation manner, the apparatus 20 further includes:

[0227] A second receiving module, configured to receive first information, where the first information is used to feedback a third reference signal, and the third reference signal is a reference signal whose signal quality meets a preset condition among at least one second reference signal;

[0228] A third sending module, configured to send resource configuration information, where the resource configuration information is configuration information of a second access resource associated with the third reference signal.

[0229] In a possible implementation manner, the apparatus 20 further includes:

[0230] A fourth sending module, configured to send second information, where the second information is used to trigger the terminal device to send the first information.

[0231] The communication apparatus 20 may execute the steps performed by the network device in the foregoing method embodiment, and its implementation principle and beneficial effects are similar, which will not be elaborated here.

[0232] Figure 11 FIG. is a schematic structural diagram of a communication apparatus 30 provided in an embodiment of the present application. Please refer to Figure 11 , the communication apparatus 30 may include: a transceiver 31, a memory 32, and a processor 33. The transceiver 31 may include: a transmitter and / or a receiver. The transmitter may also be referred to as a sender, a transmitter, a transmitting port, a transmitting interface, or other similar descriptions, and the receiver may also be referred to as a receiver, a receiver, a receiving port, a receiving interface, or other similar descriptions. Exemplarily, the transceiver 31, the memory 32, and the processor 33 are interconnected with each other through a bus 34.

[0233] The memory 32 is used to store program instructions;

[0234] The processor 33 is used to execute the program instructions stored in the memory, so that the communication apparatus 30 executes the steps performed by the terminal or the network device in the foregoing method embodiment.

[0235] The transceiver 31 is used to execute the transceiver function of the communication apparatus 30 in the foregoing communication method.

[0236] The communication apparatus 30 may be a chip, a module, an integrated development environment (IDE), etc.

[0237] The communication apparatus 30 may execute the steps performed by the terminal or the network device in the foregoing method embodiment, and its implementation principle and beneficial effects are similar, which will not be elaborated here.

[0238] An embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a computer, cause the communication method of any one of the above to be executed.

[0239] An embodiment of the present application may also provide a computer program product, which can be executed by a processor and, when executed by the computer, causes the communication method of any one of the above to be executed.

[0240] All or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a readable memory. When the program is executed, it executes the steps including the above method embodiments; and the foregoing memory (storage medium) includes: Read Only Memory (ROM), Random Access Memory (RAM), flash memory, hard disk, solid state drive, magnetic tape, floppy disk, optical disc, and any combination thereof.

[0241] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processing unit of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0242] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0243] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing in the processFigure 1 one process or multiple processes and / or blocks Figure 1 steps of functions specified in one block or multiple blocks.

[0244] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A communication method, characterized in that, Including: Sending indication information, where the indication information instructs a network device to send a second reference signal; Receiving at least one second reference signal; Initiating random access based on the at least one second reference signal.

2. The method according to claim 1, characterized in that, Receiving the at least one second reference signal within a first time window, where a start moment of the first time window is after a sending moment of the indication information.

3. The method according to claim 1 or 2, characterized in that, The initiating random access based on the at least one second reference signal includes: Determining a third reference signal based on the at least one second reference signal, where the third reference signal is a reference signal among the at least one second reference signals whose signal quality meets a preset condition; Initiating random access based on the third reference signal.

4. The method according to claim 3, wherein The initiating random access based on the third reference signal includes: Receiving second system information at a frequency point where the third reference signal is located; Initiating random access based on the second system information.

5. The method according to claim 3, characterized in that The method further includes: Receiving first system information, where the first system information includes a first association relationship, the first association relationship being an association relationship between an index of a first reference signal and a first access resource, and a frequency point where the first reference signal is located is lower than a frequency point where the second reference signal is located; The sending the indication information includes: Sending the indication information on a first access resource.

6. The method according to claim 5, characterized in that, The initiating random access based on the third reference signal includes: Initiating random access on a second access resource associated with the third reference signal, where a time-frequency position of the second access resource associated with the third reference signal is determined based on resource configuration information.

7. The method according to claim 6, wherein The first system information further includes a second association relationship and the resource configuration information, the second association relationship including an association relationship between an index of a second reference signal and a second access resource, and the resource configuration information being configuration information of the second access resource.

8. The method according to claim 5, characterized in that, The first system information further includes a second association relationship, the second association relationship including an association relationship between an index of a second reference signal and a second access resource; The initiating random access based on the third reference signal includes: Sending first information, where the first information is used to feedback the third reference signal; Receiving resource configuration information, where the resource configuration information is configuration information of a second access resource associated with the third reference signal; Initiating random access on a second access resource associated with the third reference signal, where a time-frequency position of the second access resource associated with the third reference signal is determined based on the resource configuration information.

9. The method according to claim 8, characterized in that, The method further includes: Receiving second information, where the second information is used to trigger the terminal device to send the first information.

10. A communication method, characterized in that, Including: Receiving indication information, where the indication information instructs a network device to send a second reference signal; Determining at least one second reference signal; Sending the at least one second reference signal.

11. The method according to claim 10, wherein The method further includes: Sending first system information, where the first system information includes a first association relationship, the first association relationship being an association relationship between an index of a first reference signal and a first access resource, and a frequency point where the first reference signal is located is lower than a frequency point where the second reference signal is located; The receiving the indication information includes: Receive the indication information on a first access resource; The determining of at least one second reference signal includes: Determine the at least one second reference signal based on a first reference signal associated with the first access resource.

12. The method according to claim 11, characterized in that, The first system information further includes a second association relationship, where the second association relationship is an association relationship between an index of a second reference signal and a second access resource.

13. The method according to claim 12, wherein The first system information further includes resource configuration information, where the resource configuration information is the resource configuration information of the second access resource.

14. The method according to claim 12, wherein The method further includes: Receive first information, where the first information is used to feed back a third reference signal, and the third reference signal is a reference signal among the at least one second reference signal whose signal quality meets a preset condition; Send resource configuration information, where the resource configuration information is the configuration information of a second access resource associated with the third reference signal.

15. The method according to claim 14, wherein The method further includes: Send second information, where the second information is used to trigger the terminal device to send the first information.

16. A communication device, characterized in that, Includes: A first sending module, configured to send indication information, where the indication information instructs the network device to send a second reference signal; A first receiving module, configured to receive at least one second reference signal; A second sending module, configured to initiate random access based on the at least one second reference signal.

17. A communication device, characterized in that, Includes: A first receiving module, configured to receive indication information, where the indication information instructs the network device to send a second reference signal; A determining module, configured to determine at least one second reference signal; A first sending module, configured to send the at least one second reference signal.

18. A communication device, characterized in that, Includes: A processor and a memory; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1-9, or the method according to any one of claims 10-15.

19. A computer-readable storage medium, characterized in that, Computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by the processor, the method according to any one of claims 1-9, or the method according to any one of claims 10-15 is implemented.

20. A computer program product, characterized in that, Includes a computer program, and when the computer program is executed by the processor, the method according to any one of claims 1-9, or the method according to any one of claims 10-15 is implemented.

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