Communication method, terminal, network device, system, storage medium, and program product

Abstract

The present disclosure relates to a communication method, a terminal, a network device, a system, a storage medium, and a program product. The communication method comprises: a terminal receives at least one first reference signal, and determines a first random access occasion and / or a first preamble corresponding to the first reference signal. The present disclosure can improve the communication efficiency.

Description

Communication methods, terminals, network devices, systems, storage media and software products Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to communication methods, terminals, network devices, systems, storage media, and program products. Background Technology

[0002] In communication scenarios, high-frequency bands and massive MIMO (Massively Multi-Sized Antenna Arrays) are introduced to improve spectral efficiency. Massive MIMO can provide greater beamforming gain to compensate for the transmission losses caused by high-frequency bands. Summary of the Invention

[0003] This disclosure provides communication methods, terminals, network devices, systems, storage media, and program products.

[0004] According to a first aspect of the present disclosure, a communication method is proposed, the method comprising: a terminal receiving at least one first reference signal, and determining a first random access timing and / or a first preamble corresponding to the first reference signal.

[0005] According to a second aspect of the present disclosure, a communication method is proposed, the method comprising: a network device sending at least one first reference signal, the first reference signal corresponding to a first random access timing and / or a first preamble.

[0006] According to a third aspect of the present disclosure, a terminal is provided, comprising: a transceiver module for receiving at least one first reference signal; and a processing module for determining a first random access timing and / or a first preamble corresponding to the first reference signal.

[0007] According to a fourth aspect of the present disclosure, a network device is provided, comprising: a transceiver module for transmitting at least one first reference signal, the first reference signal corresponding to a first random access timing and / or a first preamble.

[0008] According to a fifth aspect of the present disclosure, a terminal is provided, comprising: one or more processors; wherein the terminal is configured to execute the first aspect and any one of the communication methods in the first aspect.

[0009] According to a sixth aspect of the present disclosure, a network device is provided, comprising: one or more processors; wherein the network device is configured to perform the second aspect and any one of the communication methods in the second aspect.

[0010] According to a seventh aspect of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the terminal is configured to implement the first aspect and any one of the communication methods in the first aspect, and the network device is configured to implement the second aspect and any one of the communication methods in the second aspect.

[0011] According to an eighth aspect of the present disclosure, a storage medium is provided that stores instructions which, when executed on a communication device, cause the communication device to perform a communication method as described in the first aspect and any one thereof, or the second aspect and any one thereof.

[0012] According to a ninth aspect of the present disclosure, a program product is provided, comprising: a computer program, which, when executed by a communication device, causes the communication device to perform a communication method as described in the first aspect and any one of the first aspects or the second aspect and the second aspect.

[0013] This disclosure enables better random access and improves communication efficiency by receiving at least one first reference signal through a terminal and determining the first random access timing and / or first preamble corresponding to the first reference signal. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0015] Figure 1a is a schematic diagram of the near and far fields illustrating an exemplary embodiment of the present disclosure.

[0016] Figure 1b is a schematic diagram illustrating far-field UE receiving electromagnetic waves according to an exemplary embodiment of the present disclosure.

[0017] Figure 1c is a schematic diagram illustrating near-field UE receiving electromagnetic waves according to an exemplary embodiment of this disclosure.

[0018] Figure 1d is a schematic diagram of the RO corresponding to the SSB as illustrated in an exemplary embodiment of this disclosure.

[0019] Figure 1e is a schematic diagram of a communication system architecture according to an embodiment of the present disclosure.

[0020] Figure 2 is a schematic diagram of a communication method interaction according to an embodiment of the present disclosure.

[0021] Figure 3 is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0022] Figure 4 is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0023] Figure 5 is a schematic diagram of a communication method interaction according to an embodiment of the present disclosure.

[0024] Figure 6a is a schematic diagram of the structure of the terminal proposed in an embodiment of this disclosure.

[0025] Figure 6b is a schematic diagram of the structure of the network device proposed in an embodiment of this disclosure.

[0026] Figure 7a is a schematic diagram of the structure of a communication device proposed in an embodiment of this disclosure.

[0027] Figure 7b is a schematic diagram of the chip structure proposed in an embodiment of this disclosure. Detailed Implementation

[0028] This disclosure provides communication methods, terminals, network devices, systems, storage media, and program products.

[0029] In a first aspect, embodiments of this disclosure propose a communication method, the method comprising: a terminal receiving at least one first reference signal, and determining a first random access timing and / or a first preamble corresponding to the first reference signal.

[0030] In some alternative embodiments of the first aspect, the method further includes: if the measured value corresponding to the first reference signal is greater than a first threshold value, the terminal initiates a random access procedure based on the first random access opportunity and / or the first preamble.

[0031] In some alternative embodiments of the first aspect, the method further includes: the terminal receiving at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

[0032] In some alternative embodiments of the first aspect, different second reference signal resources correspond to different beams; or, different ports of the same second reference signal resource correspond to different beams.

[0033] In some alternative embodiments of the first aspect, different second reference signals among the at least one second reference signal correspond to different second reference signal resources; or, different second reference signals among the at least one second reference signal correspond to different ports of the same second reference signal resource.

[0034] In some alternative embodiments of the first aspect, the terminal receives the at least one second reference signal when the following conditions are met: the measured value corresponding to the first reference signal is greater than a second threshold value; and / or, the measured value corresponding to the first reference signal is less than a third threshold value.

[0035] In some optional embodiments of the first aspect, the method further includes: the terminal determining a second random access timing and / or a second preamble corresponding to the second reference signal when at least one of the following conditions is met, and initiating a random access procedure based on the second random access timing and / or the second preamble: the measurement value corresponding to the second reference signal is greater than a fourth threshold value; the difference between the measurement value corresponding to the second reference signal and the measurement value corresponding to the first reference signal is greater than a fifth threshold value.

[0036] In some alternative embodiments of the first aspect, the method further includes: the terminal determining a threshold value based on the Master Information Block (MIB) or the System Information Block (SIB), the threshold value including at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

[0037] In some alternative embodiments of the first aspect, the method further includes: the terminal determining information about the second reference signal resource and / or port information corresponding to the second reference signal resource; wherein the second reference signal resource is associated with the first reference signal.

[0038] In some optional embodiments of the first aspect, the terminal determines the information of the second reference signal resource or the port information corresponding to the second reference signal resource in the following ways: determining based on a protocol, wherein the protocol specifies the information of the second reference signal resource or the port information corresponding to the second reference signal resource; or determining based on first information sent by a network device, wherein the first information indicates at least one of the following: the quantity of the second reference signal resource; the identifier of the second reference signal resource; the quantity of ports corresponding to the second reference signal resource; the port identifier corresponding to the second reference signal resource; or determining based on a protocol and the first information sent by a network device, wherein the protocol specifies the time-frequency position occupied by the reference signal resource and / or the time-frequency position occupied by the port corresponding to the reference signal resource, wherein the first information indicates at least one of the following: the identifier of the reference signal resource; the quantity of the reference signal resource; the quantity of ports corresponding to the identifier of the reference signal resource; the port identifier corresponding to the identifier of the reference signal resource; the offset value between the first time-domain unit position of the reference signal resource and the time-domain unit position of the first reference signal; wherein the reference signal resource includes at least one second reference signal resource.

[0039] In some alternative embodiments of the first aspect, the first information is carried by at least one of the following: a demodulation reference signal (DMRS) sequence in the synchronization signal block (SSB); a physical broadcast channel (PBCH) carrying a median block (MIB); downlink control information (DCI) transmitted in the common search space of the control resource set (CORESET#0); a PDSCH scheduled by the DCI in CORESET#0; and an SIB.

[0040] In some alternative embodiments of the first aspect, the second random access opportunity and / or the second preamble is determined in the following manner: if there are multiple second reference signal resources, then the second random access opportunity and / or the second preamble corresponding to each second reference signal resource is determined; if there is only one second reference signal resource and the second reference signal resource corresponds to multiple ports, then the second random access opportunity and / or the second preamble corresponding to each port is determined.

[0041] In a second aspect, a communication method is provided, the method comprising: a network device transmitting at least one first reference signal, the first reference signal corresponding to a first random access timing and / or a first preamble.

[0042] In some alternative embodiments of the second aspect, the network device receives a first preamble sent by the terminal during a first random access opportunity, wherein the terminal sends the first preamble based on the first random access opportunity when the measured value corresponding to the first reference signal is greater than a first threshold value.

[0043] In some alternative embodiments of the second aspect, the method further includes: the network device sending at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

[0044] In some alternative embodiments of the second aspect, different second reference signal resources correspond to different beams; or, different ports of the same second reference signal resource correspond to different beams.

[0045] In some alternative embodiments of the second aspect, different second reference signals among the at least one second reference signal correspond to different second reference signal resources; or, different second reference signals among the at least one second reference signal correspond to different ports of the same second reference signal resource.

[0046] In some alternative embodiments of the second aspect, the network device receives a second preamble sent by the terminal during a second random access timing. The terminal sends the second preamble based on the second random access timing if at least one of the following conditions is met: the measured value corresponding to the second reference signal is greater than a fourth threshold value; the difference between the measured value corresponding to the second reference signal and the measured value corresponding to the first reference signal is greater than a fifth threshold value.

[0047] In some alternative embodiments of the second aspect, the method further includes: the network device configuring a threshold value based on the Master Information Block (MIB) or System Information Block (SIB), the threshold value including at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

[0048] In some alternative embodiments of the second aspect, the method further includes: the network device sending first information, the first information being used to determine information of a second reference signal resource and / or port information corresponding to the second reference signal resource; wherein the second reference signal resource is associated with the first reference signal.

[0049] In some alternative embodiments of the second aspect, the first information is used to indicate at least one of the following: the number of the second reference signal resources; the identifier of the second reference signal resources; the number of ports corresponding to the second reference signal resources; the port identifier corresponding to the second reference signal resources; or, the protocol specifies the time-frequency position occupied by the reference signal resources and / or the time-frequency position occupied by the ports corresponding to the reference signal resources, wherein the first information is used to indicate at least one of the following: the identifier of the reference signal resources; the number of reference signal resources; the number of ports corresponding to the identifier of the reference signal resources; the port identifier corresponding to the identifier of the reference signal resources; the offset value between the first time-domain unit position of the reference signal resources and the time-domain unit position of the first reference signal; wherein the reference signal resources include at least one second reference signal resource.

[0050] In some alternative embodiments of the second aspect, the first information is carried by at least one of the following: the demodulation reference signal (DMRS) sequence in the synchronization signal block (SSB); the MIB carried by the physical broadcast channel (PBCH); the downlink control information (DCI) transmitted in the common search space of the control resource set (CORESET#0); the PDSCH scheduled by the DCI in CORESET#0; and the SIB.

[0051] In some alternative embodiments of the second aspect, when there are multiple second reference signal resources, the second random access timing and / or the second preamble is the second random access timing and / or the second preamble corresponding to each of the second reference signal resources; when there is one second reference signal resource and the second reference signal resource corresponds to multiple ports, the second random access timing and / or the second preamble is the second random access timing and / or the second preamble corresponding to each of the ports.

[0052] Thirdly, a terminal is provided, comprising: a transceiver module for receiving at least one first reference signal; and a processing module for determining a first random access timing and / or a first preamble corresponding to the first reference signal.

[0053] Fourthly, a network device is provided, comprising: a transceiver module for transmitting at least one first reference signal, the first reference signal corresponding to a first random access timing and / or a first preamble.

[0054] Fifthly, a terminal is provided, comprising: one or more processors; wherein the terminal is configured to execute the first aspect and any one of the communication methods in the first aspect.

[0055] A sixth aspect provides a network device, comprising: one or more processors; wherein the network device is configured to perform the second aspect and any one of the communication methods described in the second aspect.

[0056] A seventh aspect provides a communication system, including a terminal and a network device, wherein the terminal is configured to implement the first aspect and any one of the communication methods in the first aspect, and the network device is configured to implement the second aspect and any one of the communication methods in the second aspect.

[0057] Eighthly, a storage medium is provided that stores instructions, which, when executed on a communication device, cause the communication device to perform a communication method as described in the first aspect and any one thereof, or the second aspect and any one thereof.

[0058] Ninth aspect, a program product is provided, comprising: a computer program, which, when executed by a communication device, causes the communication device to perform a communication method as described in the first aspect and any one of the first aspects or the second aspect and the second aspect.

[0059] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in an optional implementation of the first or second aspect.

[0060] Eleventhly, embodiments of this disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to perform the methods described in the optional implementations of the first or second aspect above.

[0061] It is understood that the terminals, access network devices, first network elements, other network elements, core network devices, communication systems, storage media, program products, computer programs, chips, or chip systems involved in the embodiments of this disclosure are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0062] This disclosure provides communication methods, terminals, network devices, systems, storage media, and program products. In some embodiments, the terms "communication method" and "information processing method" can be used interchangeably, as can the terms "communication device" and "information processing device" and "communication device," and the terms "information processing system" and "communication system."

[0063] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0064] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. The technical environments of different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0065] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0066] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0067] In the embodiments of this disclosure, "multiple" refers to two or more.

[0068] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0069] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of B); in some embodiments, B (execute B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, C, etc.

[0070] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0071] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0072] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0073] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0074] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0075] In some embodiments, the apparatus and device may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "body", etc.

[0076] In some embodiments, "network" can be interpreted as devices included in the network, such as access network devices, core network devices, etc.

[0077] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)," "base station (BS)," "radio base station," or "fixed station." In some embodiments, it may also be understood as "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," or "bandwidth part (BWP)."

[0078] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," etc.

[0079] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0080] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0081] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0082] In communication scenarios, high-frequency bands and massive MIMO (Massively Multi-Sized Antenna Arrays) are introduced to improve spectral efficiency. Massive MIMO can provide greater beamforming gain to compensate for the transmission losses caused by high-frequency bands.

[0083] For an antenna array (whose aperture is denoted as D), its electromagnetic (EM) field can be divided into a near field and a far field. As shown in Figure 1a, which is a schematic diagram of the near and far fields illustrating an exemplary embodiment of this disclosure, the boundary between the near and far fields is shown. This is called the Rayleigh distance. Here, λ represents the wavelength. The size of the near-field range depends on both the antenna aperture (D) and the wavelength (λ). If the terminal is in the far field, the electromagnetic wave received by the terminal may be a plane wave, and the beam directed at the terminal is a two-dimensional (2D) directional beam pointing towards the terminal. If the terminal is in the near field, then the electromagnetic wave received by the terminal may be a spherical wave, and the beam directed at the terminal is a three-dimensional (3D) beam surrounding the terminal. In Figure 1a, ∞ represents positive infinity.

[0084] Figure 1b is a schematic diagram illustrating far-field UE electromagnetic wave reception according to an exemplary embodiment of this disclosure. As shown in Figure 1b, for a UE in the far field, the electromagnetic waves arriving at the UE from its different antenna ports or elements are plane waves, and the beam targeting the UE is a two-dimensional (2D) directional beam pointing towards the target UE. For any path in multipath propagation, the time and phase of arrival at the UE receiving antenna array are equally spaced.

[0085] Figure 1c is a schematic diagram illustrating near-field UE electromagnetic wave reception according to an exemplary embodiment of this disclosure. As shown in Figure 1c, if the UE is located in the near field, the electromagnetic wave received by the UE is a spherical wave, and the beam targeting the UE is a three-dimensional (3D) beam surrounding the target UE. For any path in multipath propagation, the time and phase of arrival at the UE receiving antenna array will no longer be equally spaced.

[0086] In other words, for a far-field terminal, multiple ports arrive at the terminal in the same direction. For a near-field terminal, different ports arrive at the terminal in different directions.

[0087] In some embodiments, if a base station has 32 transmit beam directions, it may only need to transmit 32 reference signal resources based on the 32 beam directions from any one port. However, for near-field terminals, the distance to the terminal from the first beam direction transmitted by the base station at the first port is different from the distance from the first beam direction transmitted by the base station at the second port. Therefore, the base station needs to transmit 32 beam directions separately at each port. If the base station still transmits the reference signals for beam measurement in a single-port manner, the scanning time of the terminal will increase to a multiple of the number of ports.

[0088] In some embodiments, the base station transmits a multi-port reference signal. The terminal can measure the Layer 1 reference signal received power (L1-RSRP) or the Layer 1 signal to interference plus noise ratio (L1-SINR) corresponding to different ports of the same reference signal, and report each port / port group of each reference signal resource identifier and the corresponding L1-RSRP / L1-SINR.

[0089] In some embodiments, each Synchronization Signal Block (SSB) corresponds to a different SSB index, and the terminal can obtain downlink synchronization based on the different transmission times corresponding to the SSB index.

[0090] In some embodiments, each SSB can occupy four consecutive symbols, in the following order: Primary Synchronization Signal (PSS), PBCH, Secondary Synchronization Signal (SSS) + PBCH (the middle 12 Resource Blocks (RBs) are the SSS, and the four RBs on each side are the PBCH; that is, the SSB occupies 20 RBs), and PBCH. Some subcarriers in the PBCH are DMRS. The subcarrier spacing of the synchronization signal blocks can be 15 kHz, 30 kHz, 120 kHz, and 240 kHz. All synchronization signal blocks are transmitted within a 5-millisecond (ms) timeframe. To support beam transmission, each beam needs to transmit an SSB when there is a beam. Therefore, the maximum number of synchronization signal blocks that can be transmitted within 5 ms is 4 (below 3 GHz), 8 (3 GHz to 7 GHz), or 64 (above 24 GHz). These multiple SSBs within 5 ms are called an SSB Burst Set. The period of the SSB burst set can be 5ms, 10ms, 20ms, 40ms, etc.

[0091] Example as follows:

[0092] a) At 15kHz, the time-domain distribution of the synchronization signal block is as follows: symbols 2-5 and 8-11 are occupied in every 14 symbols. At 15kHz, the maximum number of synchronization signal blocks is 4 or 8. That is, the starting symbol position of each synchronization signal block is {2,8}+14*n, where n is 0,1 or 0,1,2,3. Here, {} represents a set, and {2,8} means it can be any value in the set, i.e., either 2 or 8.

[0093] b) At 30kHz, the time-domain distribution of the synchronization signal block is as follows: symbols 2-5 and 8-11 are occupied in every 14 symbols. At 30kHz, the maximum number of synchronization signal blocks is 4 or 8. That is, the starting symbol position of each synchronization signal block is {2,8}+14*n, where n is 0,1 or 0,1,2,3.

[0094] c) At 30kHz, the time-domain distribution of the synchronization signal block is as follows: symbols 4-7, 8-11, 16-21, and 20-23 are occupied out of every 28 symbols. However, at 30kHz, the maximum number of synchronization signal blocks is 4 or 8. That is, the starting position of each synchronization signal block is {4,8,16,20}+28*n, where n is 0 or n=0 or 1.

[0095] d) At 120kHz, the time-domain distribution of the synchronization signal blocks is as follows: symbols 4-7, 8-11, 16-21, and 20-23 are occupied out of every 28 symbols. At 120kHz, the maximum number of synchronization signal blocks is 64. That is, the starting position of each synchronization signal block is {4,8,16,20} + 28*n, where n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

[0096] e) At 240kHz, the time-domain distribution of the synchronization signal blocks is as follows: symbols 8-11, 12-15, 16-21, 20-23, 32-35, 36-39, 40-43, and 44-47 are occupied out of every 56 symbols. At 240kHz, the maximum number of synchronization signal blocks is 64. That is, the starting position of each synchronization signal block is {8,12,16,20,32,36,40,44} + 56*n, where n = 0, 1, 2, 3, 5, 6, 7, 8.

[0097] In this case, the SSB is fixed in position. The terminal receives the SSB and obtains the SSB index from the DMRS sequence in the SSB or the payload in the DMRS sequence and PBCH. Then, it can determine which symbol in which slot the SSB corresponds to within 5ms, thus achieving downlink synchronization.

[0098] In some embodiments, during initial synchronization between the UE and the base station, the UE detects one of the SSBs sent by the base station, obtains the SSB index, and thus knows the symbol position of the SSB. Therefore, the UE and the base station achieve downlink symbol synchronization. To achieve uplink synchronization, the UE needs to send a random access preamble (RA preamble). The selection of this preamble and the RA Occasion (RO) at which it is sent are determined based on the SSB received by the user, the actual SSBs sent by the base station, and the set of RO positions. Here, RO can refer to time-frequency resources.

[0099] For example, the specific process is as follows:

[0100] Step 1: The UE detects that the SSB index of the SSB it received is SSB#1.

[0101] Step 2: The UE receives the System Information Block (SIB) 1 message sent by the base station, indicating which SSB information the base station actually transmitted. The base station uses two 8-bit segments to indicate which SSBs were actually transmitted. Since the maximum transmittable position of an SSB is 64, these 64 SSBs are divided into 8 groups, with the 8 SSB positions within each group being consecutive. That is, SSB#0 to #7 are the first group, SSB#8 to #15 are the second group, and so on, with SSB#56 to #63 being the eighth group. The first 8-bit segment indicates which groups have SSBs transmitted. For example, if the first 8-bit segment is 00000001 (the left side is the high-order bit, and the right side is the low-order bit), it means that only the first group has SSBs transmitted. The second 8-bit segment indicates which positions of the SSBs were transmitted within those groups. For example, if the second 8-bit segment is 10011011, it means that SSB#0, #1, #3, #4, and #7 were transmitted within the first group.

[0102] Thirdly, through the first and second steps, the UE knows that the SSB#1 it received is the second of the five SSBs sent by the base station.

[0103] Fourth, the UE receives SIB1 from the base station to obtain the SSB-perRACH-Occasion information for each SSB. This information identifies how many actual SSBs need to allocate the preamble within a RO. The value is SSB-perRACH-Occasion{1 / 8, 1 / 4, 1 / 2, 1, 2, 4, 8, 16}. When this parameter is 1 / 8, it means the SSB occupies 8 consecutive ROs. When this parameter is 8, it means 8 actual consecutive SSBs share the RO but use different preambles. For example, 64 preambles are divided into 8 consecutive groups, with each SSB corresponding to one group of preambles. Simultaneously, the UE receives SIB1 from the base station to obtain the number of ROs in the FDM, which can be one of {1, 2, 4, 8}. If the value is 2, it means there are two ROs in different frequency domains at the same time. The RO numbering is frequency domain first, then time domain. For example, when SSB-perRACH-Occasion is 2 and the number of ROs in Frequency Division Multiplexing (FDM) is 2, the ROs corresponding to SSB can be as shown in Figure 1d. Figure 1d is a schematic diagram of the ROs corresponding to SSB shown in an exemplary embodiment of this disclosure. In Figure 1d, the horizontal axis represents time and the vertical axis represents frequency.

[0104] In some embodiments, for near-field terminals, the optimal transmission beams corresponding to different antenna ports are different. Since the SSBs in the above embodiments are all single-port transmissions, if all transmission beams corresponding to that port are not suitable for the near-field terminal, then one or more Channel State Information-Reference Signal (CSI-RS) resources can be associated with each SSB. These CSI-RS resources can be transmitted based on a different port than the SSB, thereby achieving better coverage for the near-field terminal. However, how to enable near-field terminals to perform better random access remains a problem that needs to be solved.

[0105] Therefore, this disclosure provides a communication method in which a terminal receives at least one first reference signal and determines a first random access opportunity and / or a first preamble corresponding to the first reference signal, thereby achieving better random access and improving communication efficiency.

[0106] Figure 1e is a schematic diagram of a communication system architecture according to an embodiment of the present disclosure.

[0107] As shown in Figure 1e, the communication system 100 includes a terminal 101 and a network device 102.

[0108] In some embodiments, terminal 101 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0109] In some embodiments, network device 102 may include at least one of access network device and core network device.

[0110] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation eNB (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved node B (HeNB), radio backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a Wi-Fi system.

[0111] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0112] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0113] In some embodiments, a core network device may be a single device comprising one or more network elements, or it may be multiple devices or a group of devices, each comprising all or part of the aforementioned one or more network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0114] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0115] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1e, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1e are illustrative. The communication system may include all or some of the main bodies in FIG1e, or it may include other main bodies outside of FIG1e. The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection may be in any way, such as direct connection or indirect connection, wired connection or wireless connection.

[0116] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0117] Figure 2 is a schematic diagram of a communication method interaction according to an embodiment of the present disclosure. As shown in Figure 2, this embodiment of the present disclosure relates to a communication method for a communication system 100, the method including:

[0118] In step S2101, network device 102 sends at least one first reference signal to terminal 101.

[0119] In some embodiments, terminal 101 receives at least one first reference signal sent by network device 102.

[0120] In some embodiments, the first reference signal may be SSB, but is not limited thereto.

[0121] In step S2102, terminal 101 measures at least one first reference signal.

[0122] In some embodiments, the terminal can measure the first reference signal, thereby determining whether to initiate a random access procedure based on the first random access timing and / or the first preamble corresponding to the first reference signal, and determining whether to receive at least one second reference signal, and initiating a random access procedure based on the second random access timing and / or the second random access preamble corresponding to the second reference signal. In other words, the terminal can receive the first reference signal and, based on the measurement value corresponding to the first reference signal, better initiate a random access procedure to improve communication efficiency.

[0123] In some embodiments, the measured values ​​corresponding to the first reference signal may include L1-RSRP, L1-SINR, Layer 3 reference signal received power (L3-RSRP), Layer 3 Reference Signal Received Quality (L3-RSRQ), Layer 3 signal to interference plus noise ratio (L3-SINR), reference signal received power (RSRP), signal to interference plus noise ratio (SINR), and reference signal received quality (RSRQ), but are not limited thereto.

[0124] In some embodiments, if the measured value of the first reference signal is greater than a first threshold value, the terminal may initiate a random access procedure based on the first random access opportunity and / or the first preamble corresponding to the first reference signal. The method by which the terminal determines the first random access opportunity and / or the first preamble corresponding to the first reference signal to initiate a random access procedure can be referred to in the embodiment of step S2103 below.

[0125] In some embodiments, the first threshold value may be determined based on an SIB or a Master Information Block (MIB). For example, a network device may indicate the first threshold value in an SIB or MIB, and a terminal may receive the MIB or SIB sent by the network device and determine the first threshold value from it.

[0126] In some embodiments, if the measured value corresponding to the first reference signal is greater than the second threshold value, the terminal may receive at least one second reference signal.

[0127] In some embodiments, the reference signal resource corresponding to the second reference signal is a second reference signal resource, which is associated with the first reference signal. That is, if the measured value corresponding to the first reference signal is greater than a second threshold value, the terminal can receive the second reference signal on the second reference signal resource associated with the first reference signal.

[0128] In some embodiments, the second reference signal resource may be a CSI-RS resource, and correspondingly, the second reference signal may be a CSI-RS, but is not limited thereto.

[0129] In some embodiments, the second threshold value may be determined based on an SIB or a MIB. For example, a network device may indicate the second threshold value in an SIB or MIB, and a terminal may receive the MIB or SIB sent by the network device and determine the second threshold value therefrom.

[0130] In some embodiments, the second threshold value and the first threshold value may be the same or different.

[0131] For example, the following threshold values ​​may also be indicated in the SIB or MIB:

[0132] Threshold 1: The terminal selects an SSB for 4-step random access. Threshold 1 is used for initial random access and random access during beam failure recovery. Threshold 1 can also be referred to as rsrp-ThresholdSSB.

[0133] Threshold 2: This threshold is used for both initial random access and beam failure recovery when the terminal selects CSI-RS for 4-step random access. It's primarily used for initial random access, including handover scenarios. Threshold 2 can also be referred to as rsrp-ThresholdCSI-RS.

[0134] Threshold 3: Used by the terminal to select an SSB for a two-step random access process. Threshold 3 can also be called msgA-RSRP-ThresholdSSB.

[0135] Threshold 4: Whether to use the terminal's normal uplink (NUL) carrier or supplementary uplink (SUL) carrier for random access. Threshold 4 can also be called rsrp-ThresholdSSB-SUL.

[0136] Threshold 5: Used by the terminal to choose between 4-step random access and 2-step random access. This threshold can also be referred to as msgA-RSRP-Threshold.

[0137] Threshold 6: Used by the terminal to select whether to resend message (Msg)1 twice, where Msg1 is the random access preamble. Threshold 6 can also be called rsrp-ThresholdMsg1-RepetitionNum2.

[0138] Threshold 7: Used by the terminal to select whether to retransmit Msg 1 4 times. Msg 1 is the random access preamble. Threshold 7 can also be called rsrp-ThresholdMsg1-RepetitionNum4.

[0139] Threshold 8: Used by the terminal to select whether to retransmit Msg 1 8 times. Msg 1 is the random access preamble. Threshold 8 can also be called rsrp-ThresholdMsg1-RepetitionNum8.

[0140] Threshold 9: Used by the terminal to select whether to retransmit Msg 3, which is the Physical Uplink Shared Channel (PUSCH) used for contention resolution. Threshold 9 can also be called rsrp-ThresholdMsg3.

[0141] In some embodiments, the first threshold value and the second threshold value are the same.

[0142] Optionally, the first threshold value and the second threshold value can both be equal to rsrp-ThresholdSSB.

[0143] In some embodiments, if the measured value corresponding to the first reference signal is less than the third threshold value, the terminal may receive at least one second reference signal.

[0144] In some embodiments, the third threshold value may be determined based on an SIB or a MIB. For example, a network device may indicate the third threshold value in an SIB or MIB, and a terminal may receive the MIB or SIB sent by the network device and determine the third threshold value therefrom.

[0145] In some embodiments, the third threshold value and the first threshold value may be the same or different.

[0146] In some embodiments, the third threshold value may be the same as the first threshold value; for example, both the third threshold value and the first threshold value may be greater than rsrp-ThresholdSSB.

[0147] Optionally, the first threshold value and the third threshold value can be the same and greater than the second threshold value.

[0148] Optionally, the second threshold value can be rsrp-ThresholdSSB.

[0149] Optionally, the first threshold value and the third threshold value are the same, which can be rsrp-ThresholdSSB, and are greater than the second threshold value.

[0150] Optionally, the first threshold value and the third threshold value are the same and greater than the second threshold value, which can be rsrp-ThresholdSSB.

[0151] In step S2103, terminal 101 determines the first random access timing and / or the first random access preamble corresponding to the first reference signal.

[0152] Optionally, terminal 101 determines a first random access opportunity corresponding to the first reference signal. For example, the terminal may determine a first random access opportunity corresponding to the first reference signal and initiate a random access procedure based on the determined first random access opportunity and any selectable preamble. For example, the terminal may send any selectable preamble at the determined first random access opportunity.

[0153] Optionally, terminal 101 determines a first random access preamble corresponding to the first reference signal. For example, the terminal may determine the first random access preamble corresponding to the first reference signal and initiate a random access procedure based on the determined first random access preamble and any selectable random access timing. For example, the terminal may send the determined first random access preamble at any selectable random access timing.

[0154] Optionally, terminal 101 determines the first random access opportunity and the first random access preamble corresponding to the first reference signal. For example, the terminal may determine the first random access opportunity and the first random access preamble corresponding to the first reference signal, and initiate a random access procedure based on the first random access opportunity and the first random access preamble corresponding to the first reference signal. For example, the terminal may send the determined first random access preamble at the determined first random access opportunity.

[0155] In some embodiments, terminal 101 may determine the first random access timing and / or the first random access preamble corresponding to the first reference signal based on SIB1. For example, the implementation methods of the above embodiments can be referred to, and will not be repeated in this disclosure.

[0156] In some embodiments, the number of first random access opportunities can be one or more, that is, the first reference signal can correspond to one or more first random access opportunities. Each first random access opportunity can include time-domain resources and frequency-domain resources. For example, the terminal determines the first random access opportunity corresponding to the first reference signal by determining a set of time-domain resources and frequency-domain resources. The terminal can send a preamble on the determined time-domain resources and frequency-domain resources to initiate a random access procedure.

[0157] In some embodiments, the number of first preambles can be one or more, that is, the first reference signal can correspond to one or more first preambles.

[0158] It is understood that the first preamble can also be called the first random access preamble, and this disclosure does not limit the name.

[0159] In some embodiments, if the measured value corresponding to the first reference signal is greater than the first threshold value, the terminal may initiate a random access procedure based on the first random access opportunity and / or the first preamble.

[0160] In step S2104, terminal 101 determines the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource.

[0161] In some embodiments, the information of the second reference signal resource may include the identifier of the second reference signal resource, the quantity of the second reference signal resource, etc. For example, the terminal can determine the time-frequency position occupied by the second reference signal resource based on the identifier, quantity, and other information of the second reference signal resource, and thus receive at least one second reference signal at the time-frequency position of the second reference signal resource.

[0162] In some embodiments, the port information corresponding to the second reference signal resource may include the port identifier corresponding to the second reference signal resource, the number of ports corresponding to the second reference signal resource, etc. For example, the terminal can determine the time-frequency position occupied by the port corresponding to the second reference signal resource based on the port identifier, the number of ports, and other port information, and thus receive at least one second reference signal at the time-frequency position occupied by the port corresponding to the second reference signal resource.

[0163] In some embodiments, the terminal may determine information about the second reference signal resource and / or port information corresponding to the second reference signal resource based on a protocol. For example, the protocol may specify information about the second reference signal resource or port information corresponding to the second reference signal resource. For example, the protocol may specify at least one of the following: the identifier of the second reference signal resource, the quantity of the second reference signal resource, the port identifier corresponding to the second reference signal resource, and the quantity of ports corresponding to the second reference signal resource.

[0164] In some embodiments, the terminal may determine information about the second reference signal resource and / or port information corresponding to the second reference signal resource based on first information sent by the network device. For example, the network device may send first information to the terminal, and the terminal may receive the first information sent by the network device. The first information may be used to indicate at least one of the following: the number of second reference signal resources; the identifier of the second reference signal resource; the number of ports corresponding to the second reference signal resource; and the port identifier corresponding to the second reference signal resource.

[0165] In some embodiments, the terminal can determine the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource based on the protocol and the first information sent by the network device. For example, the protocol specifies the time-frequency position occupied by the reference signal resource and / or the time-frequency position occupied by the port corresponding to the reference signal resource. The first information is used to indicate at least one of the following: a reference signal resource identifier; a number of reference signal resources; a number of ports corresponding to the reference signal resource identifier; a port identifier corresponding to the reference signal resource identifier; and an offset value between the first time-domain unit position of the reference signal resource and the time-domain unit position of the first reference signal. Wherein, the reference signal resource includes at least one second reference signal resource. It is understood that the second reference signal resource and / or port specified in the protocol are candidate reference signal resources and / or candidate ports for transmitting the second reference signal, while the second reference signal resource and / or port actually used for transmitting the second reference signal can be indicated by the first information of the network device. That is, the second reference signal resource actually used for transmitting the second reference signal can be determined from the candidate reference signal resources specified in the protocol. The port actually used for transmitting the second reference signal can be determined from the candidate ports specified in the protocol. For example, it can be determined by the first information.

[0166] Optionally, the first information may indicate the number of second reference signal resources. For example, suppose the protocol specifies that one first reference signal is associated with eight second reference signal resources. If the first information indicates that the number of second reference signal resources is four, then the second reference signal resources can be the first four of the eight second reference signal resources associated with the first reference signal, and the time-frequency positions occupied by these first four second reference signal resources can be the time-frequency positions occupied by these first four second reference signal resources. The time-frequency positions of these first four second reference signal resources are already specified in the protocol.

[0167] Optionally, the first information may indicate the identifier of the second reference signal resource. For example, suppose the protocol specifies that one first reference signal is associated with eight second reference signal resources. The first information may include eight bits, each bit corresponding to one second reference signal resource associated with the first reference signal. When the bit value is a first value, it indicates that the second reference signal resource corresponding to that bit is a second reference signal resource that will carry a reference signal; when the bit value is a second value, it indicates that the second reference signal resource corresponding to that bit is not a second reference signal resource that will carry a reference signal. For example, the first value may be 1, and the second value may be 0, but it is not limited to this. The time-frequency positions occupied by the eight second reference signal resources associated with the first reference signal are specified in the protocol, so the terminal can determine the time-frequency positions of the second reference signal resources. For example, the eight second reference signal resources associated with the first reference signal are reference signal resource #1, reference signal resource #2, reference signal resource #3, ..., reference signal resource #7, and reference signal resource #8, respectively. The eight bits included in the first information, from right to left, correspond to reference signal resource #1, reference signal resource #2, reference signal resource #3, ..., reference signal resource #7, and reference signal resource #8, respectively. If the bits included in the first information are 00000001, then the second reference signal resource carrying the reference signal is reference signal resource #1, and the time-frequency position occupied by the second reference signal resource is the time-frequency position occupied by reference signal resource #1 as specified in the protocol. If the bits included in the first information are 00000101, then the second reference signal resources carrying the reference signal are reference signal resource #1 and reference signal resource #3, and the time-frequency positions occupied by the second reference signal resources are the time-frequency positions occupied by reference signal resource #1 and reference signal resource #3 as specified in the protocol. This disclosure does not provide a complete list of examples, but is not limited thereto.

[0168] Optionally, the first information may indicate the number of ports corresponding to the second reference signal resource. For example, suppose the protocol specifies that one first reference signal is associated with one second reference signal resource, and the second reference signal resource corresponds to eight ports. If the first information indicates that the number of ports corresponding to the second reference signal resource is four, then the ports corresponding to the second reference signal resource are the first four of the eight ports corresponding to the second reference signal resource associated with the first reference signal, and the time-frequency positions occupied by these first four ports are already specified in the protocol.

[0169] Optionally, the first information may indicate the port identifier corresponding to the second reference signal resource. For example, suppose the protocol specifies that a first reference signal is associated with one second reference signal resource, and the second reference signal resource corresponds to 8 ports. The first information may include 8 bits, each bit corresponding to one port of the second reference signal resource associated with the first reference signal. When the bit value is a first value, it indicates that the port corresponding to the bit is a port of the second reference signal resource that carries the reference signal; when the bit value is a second value, it indicates that the port corresponding to the bit is not a port of the second reference signal resource that carries the reference signal. For example, the first value may be 1, and the second value may be 0, but it is not limited to this. The time-frequency positions occupied by the 8 ports of the second reference signal resource associated with the first reference signal are specified in the protocol, so the terminal can determine the time-frequency positions occupied by the ports of the second reference signal resource that carry the reference signal. For example, the eight ports corresponding to the second reference signal resource associated with the first reference signal are port #1, port #2, port #3, ..., port #7, port #8, and the eight bits included in the first information, from right to left, correspond to port #1, port #2, port #3, ..., port #7, port #8, respectively. If the bits included in the first information are 00000001, then the port corresponding to the second reference signal resource that carries the reference signal is port #1, and the time-frequency position occupied by the second reference signal resource is the time-frequency position occupied by port #1 as specified in the protocol. If the bits included in the first information are 00000101, then the ports corresponding to the second reference signal resource that carry the reference signal are port #1 and port #3, and the time-frequency positions occupied by the second reference signal resource are the time-frequency positions occupied by port #1 and port #3 as specified in the protocol. This disclosure does not provide a complete list of examples, but is not limited thereto.

[0170] It is understood that the specific values ​​of 4, 8, etc., mentioned above are all exemplary and are not limited in this disclosure.

[0171] In some embodiments, the time-frequency location may include the occupied symbol location and subcarrier location. For example, the time-frequency location occupied by the reference signal resource may be the symbol location and subcarrier location occupied by the reference signal resource. As another example, the time-frequency location occupied by the port corresponding to the reference signal resource may be the symbol location and subcarrier location occupied by the port corresponding to the reference signal resource.

[0172] It is understood that the ports in the various embodiments of this disclosure can also be replaced by port groups, antenna arrays, antenna array groups, antenna elements, antenna element groups, etc., and this disclosure does not limit them.

[0173] In some embodiments, if a network device sends first information to a terminal for determining information about a second reference signal resource and / or port information corresponding to the second reference signal resource, the first information may be carried by at least one of the following: a demodulation reference signal (DMRS) sequence in the SSB; a MIB carried in the Physical Broadcast Channel (PBCH); downlink control information (DCI) sent in the common search space of type #0 of the control resource set (CORESET) #0; a physical downlink shared channel (PDSCH) scheduled by the DCI in CORESET #0; and an SIB.

[0174] In step S2105, network device 102 sends at least one second reference signal to terminal 101.

[0175] In some embodiments, terminal 101 receives at least one second reference signal sent by network device 102.

[0176] In some embodiments, the description of the second reference signal may refer to step S2102. However, it is understood that the embodiments in step S2102 are optional. For example, the terminal may receive at least one second reference signal if the measured value corresponding to the first reference signal is greater than a second threshold value. It may also receive at least one second reference signal if the measured value corresponding to the first reference signal resource is less than a third threshold value. Alternatively, it may directly receive the second reference signal without determining whether to receive it based on the measured value corresponding to the first reference signal.

[0177] In some embodiments, different second reference signal resources correspond to different beams; or, different ports of the same second reference signal resource correspond to different beams. It is understood that the beams here refer to the transmit beams on the network device side.

[0178] In some embodiments, a beam can be referred to as quasi-co-location (QCL) Type D, spatial Rx parameter or spatial reception parameter, spatial Tx parameter or spatial transmission parameter, spatial setting, spatial relation information, spatial reception filter, spatial transmission filter, spatial domain filter, TCI state, indicated TCI state, joint TCI state, downlink TCI state, uplink TCI state, unified TCI state, common TCI state, etc.

[0179] Optionally, the second reference signal resource can be a single-port or multi-port reference signal resource. For example, the number of ports of the second reference signal resource can be 1. Different second reference signal resources can correspond to different beams. For example, the terminal can use the same or different beams to receive the second reference signal on different second reference signal resources, thereby accurately receiving the second reference signal and facilitating accurate measurement of the second reference signal.

[0180] Optionally, the second reference signal resource can be a multi-port reference signal resource. At least two different ports of the same second reference signal resource correspond to different beams. For example, a terminal can use the same or different beams to receive the second reference signal on the same second reference signal resource at different ports.

[0181] In some embodiments, at least one second reference signal corresponds to a different second reference signal resource; or, at least one second reference signal corresponds to a different port of the same second reference signal resource; or, at least.

[0182] Optionally, at least one second reference signal may correspond to a different second reference signal resource. For example, a first reference signal may be associated with multiple different second reference signal resources, and the second reference signals received by the terminal may be second reference signals on these multiple different second reference signal resources respectively.

[0183] Optionally, at least one second reference signal may correspond to different ports of the same second reference signal resource. For example, a first reference signal may be associated with a second reference signal resource, and the second reference signals received by the terminal may be second reference signals received separately at multiple ports of the second reference signal resource.

[0184] Optionally, multiple second reference signals in the same group of at least one second reference signal may correspond to the same second reference signal resource, while second reference signals in different groups may correspond to different second reference signal resources. For example, a first reference signal may be associated with multiple second reference signal resources, and each second reference signal resource may be a multi-port reference signal resource. The second reference signal received by the terminal may be a second reference signal received by multiple ports of each of the multiple second reference signal resources. For example, a first reference signal may be associated with second reference signal resource A and second reference signal resource B. Second reference signal resource A is a multi-port reference signal resource, and the ports corresponding to second reference signal resource A include port A1 and port A2. Second reference signal resource B is a multi-port reference signal resource, and the ports corresponding to second reference signal resource B include port B1 and port B2. The at least one second reference signal received by the terminal may be a second reference signal received at ports A1, A2, B1, and B2 respectively.

[0185] It is understood that the "same group" described in this embodiment is only for ease of understanding, and the terminal may not group the second reference signal.

[0186] Optionally, some of the at least one second reference signal corresponds to the same second reference signal resource, while others correspond to different second reference signal resources. For example, the first reference signal is associated with second reference signal resources A, B, and C. Second reference signal resource C is a multi-port reference signal resource, and the ports corresponding to second reference signal resource C include port C1 and port C2. The terminal can receive one second reference signal in first reference signal resource A and another in second reference signal resource B; that is, for this portion of the second reference signals, different second reference signals correspond to different second reference signal resources. The terminal can receive multiple second reference signals in a third reference signal resource, for example, receiving second reference signals at ports C1 and C2 respectively; that is, for this portion of the second reference signals, different second reference signals correspond to the same second reference signal resource.

[0187] In some embodiments, the terminal may not need to switch the receiving beam when receiving the first reference signal and the second reference signal, that is, the first reference signal and the second reference signal may be in a QCL relationship.

[0188] In step S2106, terminal 101 measures at least one second reference signal.

[0189] In some embodiments, the terminal can measure at least one second reference signal, thereby determining whether to initiate a random access procedure based on the second random access timing and / or the second preamble corresponding to the second reference signal, based on the measured value corresponding to the second reference signal. In other words, the terminal can receive the second reference signal and, based on the measured value corresponding to the second reference signal, better initiate a random access procedure to improve communication efficiency.

[0190] In some embodiments, if the measured value corresponding to the second reference signal is greater than the fourth threshold value, the terminal can determine the second random access opportunity and / or the second preamble corresponding to the second reference signal, and initiate a random access procedure based on the second random access opportunity and / or the second preamble.

[0191] In some embodiments, the measured values ​​corresponding to the second reference signal may include L1-RSRP, L1-SINR, Layer 3 reference signal received power (L3-RSRP), Layer 3 Reference Signal Received Quality (L3-RSRQ), Layer 3 signal to interference plus noise ratio (L3-SINR), reference signal received power (RSRP), signal to interference plus noise ratio (SINR), and reference signal received quality (RSRQ), but are not limited thereto.

[0192] In some embodiments, the fourth threshold value can be determined based on the MIB or SIB. For example, a network device can indicate the fourth threshold value via the MIB or SIB, and a terminal can receive the MIB or SIB and determine the fourth threshold value from it.

[0193] In some embodiments, if the difference between the measured value corresponding to the second reference signal and the measured value corresponding to the first reference signal is greater than the fifth threshold, the terminal can determine the second random access opportunity and / or the second preamble corresponding to the second reference signal, and initiate a random access procedure based on the second random access opportunity and / or the second preamble.

[0194] In some embodiments, the fifth measurement value may be determined based on the MIB or SIB. For example, a network device may indicate the fifth threshold value via the MIB or SIB, and a terminal may receive the MIB or SIB and determine the fifth threshold value therefrom.

[0195] In some embodiments, the fourth threshold, the fifth threshold, and the first, second, and third thresholds described above may be the same or different, and this disclosure does not limit this. At least one of the first to fifth thresholds may be determined based on MIB or SIB.

[0196] In step S2107, terminal 101 determines the second random access timing and / or the second preamble.

[0197] In some embodiments, if the terminal determines that it needs to initiate a random access procedure based on a second random access timing and / or a second preamble, the terminal may determine the second random access timing and / or the second preamble after determining the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource.

[0198] In some embodiments, the second random access timing and / or the second preamble may be determined in the following manner:

[0199] If there are multiple second reference signal resources, then determine the second random access opportunity and / or the second preamble corresponding to each second reference signal resource;

[0200] If there is only one second reference signal resource and the second reference signal resource corresponds to multiple ports, then determine the second random access timing and / or the second preamble for each port.

[0201] In some embodiments, if there are multiple second reference signal resources, then a second random access timing and / or a second preamble corresponding to each second reference signal resource is determined.

[0202] For example, multiple second reference signal resources can be used to equally divide all the first random access opportunities and / or first preambles as second random access opportunities and / or second preambles. Assume there are two first random access opportunities, RO#1 and RO#2. Assume there are 32 first preambles. Assume there are four second reference signal resources. Then the first and second second reference signal resources can share RO#1 and each correspond to 16 different first preambles out of the 32 first preambles. That is, the first second reference signal resource can correspond to 16 preambles out of the 32 preambles of RO#1, and the second second reference signal resource can correspond to the other 16 preambles out of the 32 preambles of RO#1. The third and fourth second reference signal resources can share RO#2 and correspond to 16 different first preambles out of the 32 first preambles, respectively. That is, the third second reference signal resource can correspond to 16 preambles out of the 32 preambles of RO#2, and the fourth second reference signal resource can correspond to the other 16 preambles out of the 32 preambles of RO#2.

[0203] For example, multiple second reference signal resources can be used to equally divide a portion of the first random access opportunity and the first preamble as the second random access opportunity and / or the second preamble. For instance, network devices or protocols can instruct the terminal to equally divide a certain amount of the first random access opportunity and / or the first preamble as the second random access opportunity and / or the second preamble corresponding to the multiple second reference signal resources. For example, half of the first random access opportunity and / or the first preamble can be equally divided as the second random access opportunity and / or the second preamble. Assume there are two first random access opportunities, RO#1 and RO#2. Assume there are 32 first preambles. Assume there are four second reference signal resources.

[0204] For example, four second reference signal resources can share RO#1, occupying 32 preambles of RO#1, meaning each second reference signal resource can occupy 8 preambles. In this case, RO#2 and its 32 preambles can be used in other scenarios. For example, they can be used by far-field terminals.

[0205] For example, four second reference signal resources can share RO#2, occupying 32 preambles of RO#2, meaning each second reference signal resource can occupy 8 preambles. In this case, RO#1 and its 32 preambles can be used in other scenarios. For example, they can be used by far-field terminals.

[0206] In some embodiments, if the number of second reference signal resources is one and the second reference signal resources correspond to multiple ports, then the second random access timing and / or the second preamble corresponding to each port is determined.

[0207] For example, multiple ports of a second reference signal resource can equally divide all the first random access opportunities and / or first preambles to serve as the second random access opportunities and / or second preambles. Assume there are two first random access opportunities, RO#1 and RO#2. Assume there are 32 first preambles. Assume the second reference signal resource has four ports. Then, the first port and the second port can share RO#1 and each correspond to 16 different first preambles out of the 32 preambles. That is, the first port can correspond to 16 preambles out of the 32 preambles of RO#1, and the second port can correspond to the other 16 preambles out of the 32 preambles of RO#1. The third and fourth ports can share RO#2 and correspond to 16 different first preambles out of the 32 first preambles, respectively. That is, the third port can correspond to 16 preambles out of the 32 preambles of RO#2, and the fourth port can correspond to the other 16 preambles out of the 32 preambles of RO#2.

[0208] For example, multiple ports corresponding to one port can equally divide a portion of the first random access opportunity and the first preamble to serve as the second random access opportunity and / or the second preamble. For instance, network devices or protocols can instruct the terminal to equally divide a certain amount of the first random access opportunity and / or the first preamble as the second random access opportunity and / or the second preamble corresponding to multiple second ports of the second reference signal resource. For example, 1 / 2 of the first random access opportunity and / or the first preamble can be equally divided as the second random access opportunity and / or the second preamble corresponding to multiple second ports. Assume the number of first random access opportunities is 2, RO#1 and RO#2. Assume the number of first preambles is 32. Assume the number of ports corresponding to the second reference signal resource is 4.

[0209] For example, four ports can share RO#1, occupying 32 preambles of RO#1, meaning each port can occupy 8 preambles. In this case, RO#2 and its 32 preambles can be used in other scenarios. For example, they can be used by far-field terminals.

[0210] For example, four ports can share RO#2, occupying 32 preambles of RO#2, meaning each port can occupy 8 preambles. In this case, RO#1 and its 32 preambles can be used in other scenarios. For example, they can be used by far-field terminals.

[0211] In some embodiments, the terminal may initiate random access based on a second random access opportunity and / or a second random access preamble.

[0212] Optionally, the terminal can determine the second random access timing corresponding to the second reference signal, and initiate a random access procedure based on the determined second random access timing and any selectable preamble. For example, the terminal can send any selectable preamble at the determined second random access timing.

[0213] Optionally, the terminal may determine the second random access preamble corresponding to the second reference signal, and initiate a random access procedure based on the determined second random access preamble and any selectable random access timing. For example, the terminal may send the determined second random access preamble at any selectable random access timing.

[0214] Optionally, the terminal can determine the second random access timing and the second random access preamble corresponding to the second reference signal, and initiate a random access procedure based on the second random access timing and the second random access preamble corresponding to the second reference signal. For example, the terminal can send the determined second random access preamble at the determined second random access timing.

[0215] Step S2108, terminal 101 sends a random access procedure.

[0216] In some embodiments, terminal 101 may initiate a random access procedure based on a first random access opportunity and / or a first preamble.

[0217] Optionally, the terminal may send any optional preamble during the first random access opportunity. The network device may receive any optional preamble during the first random access opportunity.

[0218] Optionally, the terminal may send the first random access preamble at any selectable random access time. The network device may receive the first random access preamble at any selectable random access time.

[0219] Optionally, the terminal may send the first random access preamble at the first random access opportunity. The network device may receive the first random access preamble at the determined first random access opportunity.

[0220] In some embodiments, terminal 101 may initiate a random access procedure based on a second random access opportunity and / or a second preamble.

[0221] Optionally, the terminal may send any optional preamble during the second random access opportunity. The network device may receive any optional preamble during the second random access opportunity.

[0222] Optionally, the terminal may send the second random access preamble at any selectable random access time. The network device may receive the second random access preamble at any selectable random access time.

[0223] Optionally, the terminal may send the second random access preamble at the second random access opportunity. The network device may receive the second random access preamble at the determined second random access opportunity.

[0224] The communication method involved in the embodiments of this disclosure may include at least one of steps S2101 to S2108. For example, steps S2101 and S2103 may be implemented as independent embodiments, but are not limited thereto. As another example, steps S2101 to S2103 and step S2108 may be implemented as separate embodiments. Again, steps S2101 and steps S2103 to S2108 may be implemented as separate embodiments.

[0225] In some embodiments, steps S2102 and steps S2104 to S2108 are optional and may be omitted or replaced in different embodiments.

[0226] In some embodiments, steps S2104 to S2107 are optional and may be omitted or replaced in different embodiments.

[0227] In some embodiments, step S2102 is optional and may be omitted or replaced in different embodiments.

[0228] In some embodiments, other optional implementations described before or after the specification corresponding to FIG2 may be referred to.

[0229] Figure 3 is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3, this embodiment of the present disclosure relates to a communication method executed by terminal 101, the method including:

[0230] Step S3101: Obtain at least one first reference signal.

[0231] The optional implementation of step S3101 can be found in the optional implementation of step S2101 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0232] In some embodiments, terminal 101 receives at least one first reference signal sent by network device 102, but is not limited thereto, and may also receive at least one first reference signal sent by other entities.

[0233] In some embodiments, terminal 101 acquires at least one first reference signal as defined by a protocol.

[0234] In some embodiments, terminal 101 obtains at least one first reference signal from upper layer(s).

[0235] In some embodiments, terminal 101 performs processing to obtain at least one first reference signal.

[0236] In some embodiments, step S3101 is omitted, and terminal 101 autonomously implements at least one function indicated by the first reference signal, or the above function is default or default.

[0237] Step S3102: Measure at least one first reference signal.

[0238] The optional implementation of step S3102 can be found in the optional implementation of step S2102 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0239] Step S3103: Determine the first random access timing and / or the first random access preamble corresponding to the first reference signal.

[0240] The optional implementation of step S3103 can be found in the optional implementation of step S2103 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0241] Step S3104: Determine the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource.

[0242] The optional implementation of step S3104 can be found in the optional implementation of step S2104 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0243] Step S3105: Obtain at least one second reference signal.

[0244] The optional implementation of step S3105 can be found in the optional implementation of step S2105 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0245] In some embodiments, terminal 101 receives at least one second reference signal sent by network device 102, but is not limited thereto, and may also receive at least one second reference signal sent by other entities.

[0246] In some embodiments, terminal 101 acquires at least one second reference signal as defined by the protocol.

[0247] In some embodiments, terminal 101 obtains at least one second reference signal from upper layer(s).

[0248] In some embodiments, terminal 101 performs processing to obtain at least one second reference signal.

[0249] In some embodiments, step S3105 is omitted, and terminal 101 autonomously implements the function indicated by at least one second reference signal, or the above function is default or default.

[0250] Step S3106: Measure at least one second reference signal.

[0251] The optional implementation of step S3106 can be found in the optional implementation of step S2106 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0252] Step S3107: Determine the second random access timing and / or the second preamble.

[0253] The optional implementation of step S3107 can be found in the optional implementation of step S2107 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0254] Step S3108: Send a first preamble or any optional preamble at the first random access opportunity; or send a second preamble or any optional preamble at the second random access opportunity; or send a first preamble or a second preamble at any optional random access opportunity.

[0255] The optional implementation of step S3108 can be found in the optional implementation of step S2108 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0256] Optionally, the terminal may send any optional preamble during the first random access opportunity. The network device may receive any optional preamble during the first random access opportunity.

[0257] Optionally, the terminal may send the first random access preamble at any selectable random access time. The network device may receive the first random access preamble at any selectable random access time.

[0258] Optionally, the terminal may send the first random access preamble at the first random access opportunity. The network device may receive the first random access preamble at the determined first random access opportunity.

[0259] Optionally, the terminal may send any optional preamble during the second random access opportunity. The network device may receive any optional preamble during the second random access opportunity.

[0260] Optionally, the terminal may send the second random access preamble at any selectable random access time. The network device may receive the second random access preamble at any selectable random access time.

[0261] Optionally, the terminal may send the second random access preamble at the second random access opportunity. The network device may receive the second random access preamble at the determined second random access opportunity.

[0262] The communication method involved in the embodiments of this disclosure may include at least one of steps S3101 to S3108. For example, steps S3101 and S3103 may be implemented as independent embodiments, but are not limited thereto. As another example, steps S3101 to S3103 and step S3108 may be implemented as separate embodiments. Again, steps S3101 and steps S3103 to S3108 may be implemented as separate embodiments.

[0263] In some embodiments, steps S3102 and S3104 to S3108 are optional and may be omitted or replaced in different embodiments.

[0264] In some embodiments, steps S3104 to S3107 are optional and may be omitted or replaced in different embodiments.

[0265] In some embodiments, step S3102 is optional and may be omitted or replaced in different embodiments.

[0266] In some embodiments, other optional implementations may be described before or after the specification corresponding to Figure 3.

[0267] Figure 4 is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 4, this embodiment of the present disclosure relates to a communication method executed by a network device 102, the method comprising:

[0268] Step S4101: Send at least one first reference signal.

[0269] The optional implementation of step S4101 can be found in the optional implementation of step S2101 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0270] In some embodiments, network device 102 sends at least one first reference signal to terminal 101, but is not limited thereto; it may also send at least one first reference signal to other entities.

[0271] Step S4102: Send at least one second reference signal.

[0272] The optional implementation of step S4102 can be found in the optional implementation of step S2105 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0273] In some embodiments, network device 102 sends at least one second reference signal to terminal 101, but is not limited thereto; it may also send at least one second reference signal to other entities.

[0274] Step S4103: Obtain a first preamble or any optional preamble at the first random access opportunity; or, obtain a second preamble or any optional preamble at the second random access opportunity; or, obtain a first preamble or a second preamble at any optional random access opportunity.

[0275] The optional implementation of step S4103 can be found in the optional implementation of step S2108 in Figure 2, as well as other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0276] The communication method involved in the embodiments of this disclosure may include at least one of steps S4101 to S4103. For example, step S4101 may be implemented as a standalone embodiment, but is not limited thereto. As another example, step S4102 may be implemented as a separate embodiment.

[0277] In some embodiments, steps S4102 to S4103 are optional and may be omitted or replaced in different embodiments.

[0278] In some embodiments, steps S4101 and S4103 are optional and may be omitted or substituted in different embodiments.

[0279] In some embodiments, other optional implementations may be described before or after the specification corresponding to Figure 4.

[0280] Figure 5 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 5, the embodiments of the present disclosure relate to a communication method, which includes:

[0281] In step S5101, network device 102 sends at least one first reference signal to terminal 101.

[0282] In step S5102, terminal 101 determines the first random access timing and / or the first preamble corresponding to the first reference signal.

[0283] In some embodiments, the above methods may include the methods of the embodiments related to the communication system 100, terminal 101, and network device 102, which will not be described again here.

[0284] This disclosure provides a communication method as follows:

[0285] In some embodiments, the terminal receives at least one first reference signal (e.g., SSB) and determines a first random access occasion (RO occasion) and / or a first preamble (preamble) corresponding to the at least one first reference signal.

[0286] In some embodiments, the first random access timing may include one or more ROs.

[0287] In some embodiments, each RO corresponds to a time-domain and frequency-domain resource.

[0288] In some embodiments, the first preamble may include one or more preambles.

[0289] In some embodiments, the terminal determines a first threshold. If the measurement value corresponding to the first SSB is greater than the first threshold, the terminal initiates a random access procedure based on the first random access opportunity and the first preamble corresponding to the first SSB.

[0290] In some embodiments, the terminal determines a first threshold based on the MIB or SIB.

[0291] In some embodiments, the terminal determines a first threshold. If the SSB measured by the terminal satisfies the conditions associated with the first threshold, the terminal receives at least one second reference signal (e.g., CSI-RS). The terminal may receive the CSI-RS corresponding to any SSB, or the CSI-RS corresponding to the K SSBs with the largest measured values, where K is greater than or equal to 1.

[0292] In some embodiments, the second reference signal resource corresponding to the second reference signal is associated with the first reference signal.

[0293] In some embodiments, at least one associated CSI-RS resource is associated with an SSB, which can be divided into two cases:

[0294] Scenario 1: A CSI-RS resource is configured with one or more ports, with different ports corresponding to different beams.

[0295] Scenario 2: Multiple CSI-RS resources, each configured with one or two ports (the same number of ports as a traditional CSI-RS used for beam measurement). Each CSI-RS resource corresponds to a different beam.

[0296] In some embodiments, based on the above-associated CSI-RS resource, restriction 1 can be added: the terminal does not need to switch the receiving beam when receiving the reference signal on the SSB and the CSI-RS resource associated with the SSB, that is, the terminal can assume that the CSI-RS and the SSB have a QCL relationship.

[0297] In some embodiments, regarding the first threshold, it should be noted that the terminal may obtain many other thresholds through the MIB or SIB, such as the following traditional thresholds.

[0298] i.rsrp-ThresholdSSB: This threshold is used by the terminal to select the SSB for 4-step random access, for both initial random access and beam failure recovery random access.

[0299] ii.rsrp-ThresholdCSI-RS: This threshold is used by the terminal to select CSI-RS for 4-step random access, for both initial random access and beam failure recovery. When used for initial random access, it primarily includes handover scenarios.

[0300] iii.msgA-RSRP-ThresholdSSB: This threshold is used by the terminal to select the SSB for two-step random access.

[0301] iv.rsrp-ThresholdSSB-SUL: This threshold is used for random access on the terminal's NUL or SUL carrier.

[0302] v.msgA-RSRP-Threshold: This threshold is used by the terminal to choose between 4-step random access or 2-step random access.

[0303] vi.rsrp-ThresholdMsg1-RepetitionNum2: This threshold is used by the terminal to select whether to retransmit Msg 1 twice. Msg 1 is the random access preamble.

[0304] vii.rsrp-ThresholdMsg1-RepetitionNum4: This threshold is used by the terminal to select whether to retransmit Msg 1 4 times. Msg 1 is the random access preamble.

[0305] viii.rsrp-ThresholdMsg1-RepetitionNum8: This threshold is used by the terminal to select whether to retransmit Msg 1 8 times. Msg 1 is the random access preamble.

[0306] ix.rsrp-ThresholdMsg3: This threshold is used by the terminal to choose whether to retransmit Msg 3, which is the PUSCH used for contention resolution.

[0307] In some embodiments, the first threshold we propose is expected to satisfy at least one of the following:

[0308] The RSRP of the SSB is found to be greater than the first threshold, which is greater than or equal to rsrp-ThresholdSSB. Since the RSRP value of the SSB is measured and compared with rsrp-ThresholdSSB, it is to prevent the terminal from correctly receiving PBCH and DMRS in the SSB if it is lower than this threshold.

[0309] The threshold of the largest SSB found is lower than the second threshold, and the second threshold is greater than rsrp-ThresholdSSB. This is because if an SSB with a large RSRP can be found, it means that the SSB has good coverage for the terminal, and there is no need to further search for the beam corresponding to CSI-RS.

[0310] In some embodiments, the terminal determines the number of second reference signal resources, or the number of ports corresponding to the second reference signal resources.

[0311] In some embodiments, the terminal determines the number of second reference signal resources or the number of ports corresponding to the second reference signal resources based on protocol specifications or base station indication information. The base station indication information may only indicate at least one of the following: reference signal resource ID, number of ports, and offset between the first symbol of the reference signal resource and the SSB. After the reference signal resource ID, number of ports, or position of the first symbol of the reference signal resource are determined, the specific symbol bit value and subcarrier position occupied by the reference signal resource, as well as the subcarrier position corresponding to each port, can be based on protocol specifications.

[0312] In some embodiments, the base station indication information indication method includes at least one of the following:

[0313] Information carried by the DMRS sequence in the SSB or information carried by the PBCH payload (MIB)

[0314] Information carried by the type #0 Common search space of CORESET#0

[0315] SIB information carried by the PDSCH of the DCI scheduler in CORESET#0

[0316] In some embodiments, the indication information may take the form of, for example, that the protocol specifies a maximum of 8 CSI-RS resources associated with an SSB, or a maximum of one CSI-RS resource associated with an SSB, and that resource corresponds to a maximum of 8 ports. The indication information may then take the form of...

[0317] i. Only indicate the number of CSI-RS resources. For example, if it indicates 4, then it refers to the first 4 out of 8. The location of the time and frequency resources corresponding to the first 4 has been specified by the protocol.

[0318] ii. Indicates the CSI-RS resource index, for example, 8 bits, where each bit corresponds to a resource. Bit "1" indicates that the CSI-RS resource is sent, and bit "0" indicates that the CSI-RS resource is not sent.

[0319] iii. Indicate the number of ports. For example, if it indicates 4, then it refers to the first 4 out of 8 ports. The time and frequency resource locations corresponding to the first 4 ports have been defined by the protocol.

[0320] iv. Indicator port index, for example, 8 bits, each bit corresponds to a resource, bit "1" indicates that the CSI-RS resource is sent, bit "0" indicates that the CSI-RS resource is not sent.

[0321] In some embodiments, different second reference signals in at least one second reference signal correspond to different CSI-RS resources, or different second reference signals in at least one second reference signal correspond to different ports / port groups or different subarray units of the base station for the same CSI-RS resource (hereinafter described by port).

[0322] In some embodiments, the terminal measures the measurement value corresponding to the CSI-RS resource. If the measurement value is greater than a third threshold, the second RO and / or the second preamble corresponding to the CSI-RS resource are determined.

[0323] In some embodiments, the first threshold and the third threshold may be the same or different. For example, the third threshold is a threshold value for random access to the random access resource corresponding to the CSI-RS, but this threshold value may be the same as or different from the first threshold.

[0324] In some embodiments, the first condition is that the measurement value corresponding to the CSI-RS resource is greater than a third threshold; the second condition is that the difference between the measurement value corresponding to the CSI-RS resource and the measurement value of the SSB corresponding to the CSI-RS resource is greater than a fourth threshold. At least one of the two conditions can be satisfied to determine the second RO / preamble based on the CSI-RS resource.

[0325] In some embodiments, after determining the number of resources or ports, how to determine the second RO or second preamble corresponding to the second reference signal.

[0326] In some embodiments, if there are multiple CSI-RS resources, a second RO or a second preamble is determined for each resource. For example, the first RO may include 2 ROs, the first preamble may include 32 preambles, and the number of CSI-RS resources may be 4.

[0327] Method 1: The first and second resources share the first RO of the two ROs, and each corresponds to 16 different preambles out of 32 preambles; the third and fourth resources share the second RO of the two ROs, and each corresponds to 16 different preambles out of 32 preambles.

[0328] Method 2: Method 1 is equivalent to multiple CSI-RS resources allocating the first RO and the first preamble. Method 2, however, allows multiple CSI-RS resources to allocate only a portion of the first RO and the first preamble. Therefore, the base station can further instruct or the protocol can further specify that multiple resources can allocate, for example, 1 / 2 of the first RO and the first preamble. In this case, four resources share one of the two ROs, and each resource occupies eight different preambles out of 32. The remaining RO and the corresponding 32 preambles are reserved for other uses, such as for use by far-field terminals.

[0329] In some embodiments, if a CSI-RS resource corresponds to multiple ports, then a second RO or a second preamble is determined for each port. Similarly, different ports correspond to different resources.

[0330] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0331] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0332] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0333] Figure 6a is a schematic diagram of the structure of a terminal proposed in an embodiment of this disclosure. As shown in Figure 6a, the terminal 6100 may include at least one of a transceiver module 6101 and a processing module 6102. The transceiver module 6101 is used to receive at least one first reference signal and determine a first random access timing and / or a first preamble corresponding to the first reference signal.

[0334] In some embodiments, the method further includes: if the measured value corresponding to the first reference signal is greater than the first threshold value, the terminal initiates a random access procedure based on the first random access opportunity and / or the first preamble.

[0335] In some embodiments, the method further includes: the terminal receiving at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

[0336] In some embodiments, different second reference signal resources correspond to different beams; or, different ports of the same second reference signal resource correspond to different beams.

[0337] In some embodiments, different second reference signals in at least one second reference signal correspond to different second reference signal resources; or, different second reference signals in at least one second reference signal correspond to different ports of the same second reference signal resource.

[0338] In some embodiments, the terminal receives at least one second reference signal when the following conditions are met: the measured value corresponding to the first reference signal is greater than a second threshold value; and / or, the measured value corresponding to the first reference signal is less than a third threshold value.

[0339] In some embodiments, the method further includes: the terminal determining a second random access timing and / or a second preamble corresponding to the second reference signal when at least one of the following conditions is met, and initiating a random access procedure based on the second random access timing and / or the second preamble: the measurement value corresponding to the second reference signal is greater than a fourth threshold value; the difference between the measurement value corresponding to the second reference signal and the measurement value corresponding to the first reference signal is greater than a fifth threshold value.

[0340] In some embodiments, the method further includes: the terminal determining a threshold value based on the Master Information Block (MIB) or the System Information Block (SIB), wherein the threshold value includes at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

[0341] In some embodiments, the method further includes: the terminal determining information about the second reference signal resource and / or port information corresponding to the second reference signal resource; wherein the second reference signal resource is associated with the first reference signal.

[0342] In some embodiments, the terminal determines the information of the second reference signal resource or the port information corresponding to the second reference signal resource in the following ways: determining based on a protocol, wherein the protocol specifies the information of the second reference signal resource or the port information corresponding to the second reference signal resource; or determining based on first information sent by the network device, wherein the first information indicates at least one of the following: the quantity of the second reference signal resource; the identifier of the second reference signal resource; the quantity of ports corresponding to the second reference signal resource; the port identifier corresponding to the second reference signal resource; or determining based on a protocol and the first information sent by the network device, wherein the protocol specifies the time-frequency position occupied by the reference signal resource and / or the time-frequency position occupied by the port corresponding to the reference signal resource, and the first information indicates at least one of the following: the identifier of the reference signal resource; the quantity of the reference signal resource; the quantity of ports corresponding to the identifier of the reference signal resource; the port identifier corresponding to the identifier of the reference signal resource; the offset value between the first time-domain unit position of the reference signal resource and the time-domain unit position of the first reference signal; wherein the reference signal resource includes at least one second reference signal resource.

[0343] In some embodiments, the first information is carried by at least one of the following: the demodulation reference signal (DMRS) sequence in the synchronization signal block (SSB); the MIB carried by the physical broadcast channel (PBCH); the downlink control information (DCI) transmitted in the common search space of the control resource set (CORESET#0); the PDSCH scheduled by the DCI in CORESET#0; and the SIB.

[0344] In some embodiments, the second random access opportunity and / or the second preamble is determined in the following manner: if there are multiple second reference signal resources, the second random access opportunity and / or the second preamble corresponding to each second reference signal resource is determined; if there is only one second reference signal resource and the second reference signal resource corresponds to multiple ports, the second random access opportunity and / or the second preamble corresponding to each port is determined.

[0345] Figure 6b is a schematic diagram of the network device proposed in an embodiment of this disclosure. As shown in Figure 6b, the network device 6200 may include at least one of a transceiver module 6201 and a processing module 6202. The transceiver module 6201 is used to transmit at least one first reference signal, the first reference signal corresponding to a first random access opportunity and / or a first preamble.

[0346] In some embodiments, the network device receives a first preamble sent by the terminal at a first random access timing, wherein the terminal sends the first preamble based on the first random access timing when the measured value corresponding to the first reference signal is greater than a first threshold value.

[0347] In some embodiments, the method further includes: the network device sending at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

[0348] In some embodiments, different second reference signal resources correspond to different beams; or, different ports of the same second reference signal resource correspond to different beams.

[0349] In some embodiments, different second reference signals in at least one second reference signal correspond to different second reference signal resources; or, different second reference signals in at least one second reference signal correspond to different ports of the same second reference signal resource.

[0350] In some embodiments, the network device receives a second preamble sent by the terminal during a second random access opportunity. The terminal sends the second preamble based on the second random access opportunity when at least one of the following conditions is met: the measured value corresponding to the second reference signal is greater than a fourth threshold value; the difference between the measured value corresponding to the second reference signal and the measured value corresponding to the first reference signal is greater than a fifth threshold value.

[0351] In some embodiments, the method further includes: the network device configuring threshold values ​​based on the Master Information Block (MIB) or System Information Block (SIB), wherein the threshold values ​​include at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

[0352] In some embodiments, the method further includes: a network device sending first information, the first information being used to determine information about a second reference signal resource and / or port information corresponding to the second reference signal resource; wherein the second reference signal resource is associated with a first reference signal.

[0353] In some embodiments, the first information is used to indicate at least one of the following: the number of second reference signal resources; the identifier of the second reference signal resources; the number of ports corresponding to the second reference signal resources; the port identifier corresponding to the second reference signal resources; or, if the protocol specifies the time-frequency position occupied by the reference signal resources and / or the time-frequency position occupied by the ports corresponding to the reference signal resources, the first information is used to indicate at least one of the following: the identifier of the reference signal resources; the number of reference signal resources; the number of ports corresponding to the identifier of the reference signal resources; the port identifier corresponding to the identifier of the reference signal resources; the offset value between the first time-domain unit position of the reference signal resources and the time-domain unit position of the first reference signal; wherein, the reference signal resources include at least one second reference signal resource.

[0354] In some embodiments, the first information is carried by at least one of the following: the demodulation reference signal (DMRS) sequence in the synchronization signal block (SSB); the MIB carried by the physical broadcast channel (PBCH); the downlink control information (DCI) transmitted in the common search space of the control resource set (CORESET#0); the PDSCH scheduled by the DCI in CORESET#0; and the SIB.

[0355] In some embodiments, when there are multiple second reference signal resources, the second random access timing and / or the second preamble is the second random access timing and / or the second preamble corresponding to each second reference signal resource; when there is one second reference signal resource and the second reference signal resource corresponds to multiple ports, the second random access timing and / or the second preamble is the second random access timing and / or the second preamble corresponding to each port.

[0356] Figure 7a is a schematic diagram of a communication device according to an embodiment of this disclosure. The communication device 7100 can be a network device, a terminal, or a chip, chip system, or processor that supports the network device in implementing any of the above methods; alternatively, the network device can be an access network device, a core network device, etc. Optionally, the terminal can be a user equipment, etc. The communication device 7100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0357] As shown in Figure 7a, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control the communication device, execute programs, and process program data. The communication device 7100 is used to execute any of the above methods. Optionally, the communication device can be a base station, a baseband chip, a terminal, a terminal chip, a DU, or a CU, etc.

[0358] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memories 7102 may also be located outside the communication device 7100.

[0359] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the transceivers 7103 perform communication steps such as sending and / or receiving in the above-described method, such as steps S2101 and S2102, but are not limited thereto. The processor 7201 performs other steps, such as steps S2103 and S2104, but is not limited thereto.

[0360] In some embodiments, a transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0361] In some embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuit 7104 is connected to the memory 7102, and the interface circuit 7104 can be used to receive signals from the memory 7102 or other devices, and can be used to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 can read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0362] The communication device 7100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 7100 described in this disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7a. The communication device may be a standalone device or a part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal, smart terminal, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0363] Figure 7b is a schematic diagram of the chip structure proposed in an embodiment of this disclosure. For cases where the communication device 7100 can be a chip or a chip system, please refer to the schematic diagram of the chip 7200 shown in Figure 7b, but it is not limited thereto.

[0364] Chip 7200 includes one or more processors 7201, which are used to perform any of the above methods.

[0365] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to memory 7203, and the interface circuit 7202 can be used to receive signals from memory 7203 or other devices, and the interface circuit 7202 can be used to send signals to memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in memory 7203 and send the instructions to processor 7201.

[0366] In some embodiments, the interface circuit 7202 performs communication steps such as sending and / or receiving in the above method, such as steps S2101 and S2102, but is not limited thereto. The processor 7201 performs other steps, such as steps S2103 and S2104, but is not limited thereto.

[0367] In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc., can be used interchangeably.

[0368] In some embodiments, chip 7200 further includes one or more memories 7203 for storing instructions. Optionally, all or part of the memories 7203 may be located outside of chip 7200.

[0369] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 7100, cause the communication device 7100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0370] This disclosure also provides a program product that, when executed by the communication device 7100, causes the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0371] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method, characterized in that, The method includes: The terminal receives at least one first reference signal and determines the first random access timing and / or the first preamble corresponding to the first reference signal.

2. The method according to claim 1, characterized in that, The method further includes: If the measured value corresponding to the first reference signal is greater than the first threshold value, the terminal initiates a random access procedure based on the first random access opportunity and / or the first preamble.

3. The method according to claim 1, characterized in that, The method further includes: The terminal receives at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

4. The method according to claim 3, characterized in that, Different second reference signal resources correspond to different beams; or, Different ports of the same second reference signal resource correspond to different beams.

5. The method according to any one of claims 3-4, characterized in that, Different second reference signals in the at least one second reference signal correspond to different second reference signal resources; or, The different second reference signals in the at least one second reference signal correspond to different ports of the same second reference signal resource.

6. The method according to any one of claims 3-5, characterized in that, The terminal receives the at least one second reference signal under the following conditions: The measured value corresponding to the first reference signal is greater than the second threshold value; and / or, The measured value corresponding to the first reference signal is less than the third threshold value.

7. The method according to any one of claims 3-6, characterized in that, The method further includes: The terminal determines the second random access opportunity and / or the second preamble corresponding to the second reference signal and initiates a random access procedure based on the second random access opportunity and / or the second preamble when at least one of the following conditions is met: The measured value corresponding to the second reference signal is greater than the fourth threshold value; The difference between the measured value corresponding to the second reference signal and the measured value corresponding to the first reference signal is greater than the fifth threshold value.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: The terminal determines a threshold value based on the Master Information Block (MIB) or the System Information Block (SIB), and the threshold value includes at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

9. The method according to any one of claims 1-8, characterized in that, The method further includes: The terminal determines the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource; The second reference signal resource is associated with the first reference signal.

10. The method according to claim 9, characterized in that, The terminal determines the information of the second reference signal resource or the port information corresponding to the second reference signal resource in the following manner: Based on the protocol, the protocol specifies information about the second reference signal resource or port information corresponding to the second reference signal resource; or, Based on first information sent by the network device, the determination is made, wherein the first information indicates at least one of the following: the quantity of the second reference signal resource; the identifier of the second reference signal resource; the quantity of ports corresponding to the second reference signal resource; the port identifier corresponding to the second reference signal resource; or, Based on the protocol and the first information sent by the network device, the protocol specifies the time-frequency position occupied by the reference signal resource and / or the time-frequency position occupied by the port corresponding to the reference signal resource. The first information is used to indicate at least one of the following: reference signal resource identifier; number of reference signal resources. The number of ports corresponding to the reference signal resource identifier; the port identifier corresponding to the reference signal resource identifier; the offset between the first time-domain unit position of the reference signal resource and the time-domain unit position of the first reference signal; wherein, the reference signal resource includes at least one second reference signal resource.

11. The method according to claim 10, characterized in that, The first information is carried by at least one of the following: The demodulation reference signal DMRS sequence in the synchronization signal block SSB; The MIB carried by the Physical Broadcast Channel (PBCH); Downlink control information (DCI) sent in the common search space of control resource set CORESET#0 (type#0); PDSCH of DCI scheduling in CORESET#0; SIB.

12. The method according to claim 7, characterized in that, The second random access timing and / or the second preamble are determined in the following manner: If there are multiple second reference signal resources, then determine the second random access opportunity and / or the second preamble corresponding to each second reference signal resource; If there is only one second reference signal resource and the second reference signal resource corresponds to multiple ports, then the second random access timing and / or the second preamble corresponding to each port is determined.

13. A communication method, characterized in that, The method includes: The network device sends at least one first reference signal, the first reference signal corresponding to a first random access opportunity and / or a first preamble.

14. The method according to claim 13, characterized in that, The network device receives a first preamble sent by the terminal during a first random access opportunity, wherein the terminal sends the first preamble based on the first random access opportunity when the measured value corresponding to the first reference signal is greater than a first threshold value.

15. The method according to claim 13, characterized in that, The method further includes: The network device sends at least one second reference signal, wherein the reference signal resource corresponding to the second reference signal is a second reference signal resource, and the second reference signal resource is associated with the first reference signal.

16. The method according to claim 15, characterized in that, Different second reference signal resources correspond to different beams; or, Different ports of the same second reference signal resource correspond to different beams.

17. The method according to any one of claims 15-16, characterized in that, Different second reference signals in the at least one second reference signal correspond to different second reference signal resources; or, The different second reference signals in the at least one second reference signal correspond to different ports of the same second reference signal resource.

18. The method according to any one of claims 15-17, characterized in that, The network device receives a second preamble sent by the terminal during a second random access opportunity. The terminal sends the second preamble based on the second random access opportunity under at least one of the following conditions: The measured value corresponding to the second reference signal is greater than the fourth threshold value; The difference between the measured value corresponding to the second reference signal and the measured value corresponding to the first reference signal is greater than the fifth threshold value.

19. The method according to any one of claims 13-18, characterized in that, The method further includes: The network device configures threshold values ​​based on the Master Information Block (MIB) or System Information Block (SIB), and the threshold values ​​include at least one of a first threshold value, a second threshold value, a third threshold value, a fourth threshold value, and a fifth threshold value.

20. The method according to any one of claims 13-19, characterized in that, The method further includes: The network device sends first information, which is used to determine the information of the second reference signal resource and / or the port information corresponding to the second reference signal resource; The second reference signal resource is associated with the first reference signal.

21. The method according to claim 20, characterized in that, The first information is used to indicate at least one of the following: the number of the second reference signal resources; the identifier of the second reference signal resources; the number of ports corresponding to the second reference signal resources; and the port identifier corresponding to the second reference signal resources. or, The protocol specifies the time-frequency location occupied by the reference signal resource and / or the time-frequency location occupied by the port corresponding to the reference signal resource. The first information is used to indicate at least one of the following: reference signal resource identifier; number of reference signal resources; The number of ports corresponding to the reference signal resource identifier; the port identifier corresponding to the reference signal resource identifier; the offset between the first time-domain unit position of the reference signal resource and the time-domain unit position of the first reference signal; wherein, the reference signal resource includes at least one second reference signal resource.

22. The method according to any one of claims 20-21, characterized in that, The first information is carried by at least one of the following: The demodulation reference signal DMRS sequence in the synchronization signal block SSB; The MIB carried by the Physical Broadcast Channel (PBCH); Downlink control information (DCI) sent in the common search space of control resource set CORESET#0 (type#0); PDSCH of DCI scheduling in CORESET#0; SIB.

23. The method according to claim 18, characterized in that, When there are multiple second reference signal resources, the second random access opportunity and / or the second preamble is the second random access opportunity and / or the second preamble corresponding to each second reference signal resource. When there is one second reference signal resource and the second reference signal resource corresponds to multiple ports, the second random access timing and / or the second preamble is the second random access timing and / or the second preamble corresponding to each port.

24. A terminal, characterized in that, include: Transceiver module, used to receive at least one first reference signal; The processing module is used to determine the first random access timing and / or the first preamble corresponding to the first reference signal.

25. A network device, characterized in that, include: The transceiver module is configured to transmit at least one first reference signal, the first reference signal corresponding to a first random access timing and / or a first preamble.

26. A terminal, characterized in that, include: One or more processors; The processor is used to execute the communication method according to any one of claims 1-12.

27. A network device, characterized in that, include: One or more processors; The processor is used to execute the communication method according to any one of claims 13-23.

28. A communication system, characterized in that, include: A terminal and a network device, wherein the terminal is configured to implement the communication method of any one of claims 1-12, and the network device is configured to implement the communication method of any one of claims 13-23.

29. A storage medium, characterized in that, include: The storage medium stores instructions that, when executed on a communication device, cause the communication device to perform the communication method as described in any one of claims 1-12 or 13-23.

30. A program product, characterized in that, include: A computer program, when executed by a communication device, causes the communication device to perform the communication method as described in any one of claims 1-12 or 13-23.

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