Random access method, device and system

Abstract

Disclosed are a random access method, device and system, which belong to the technical field of communications and can solve the problem that UE cannot access a cell due to the fact that a base station cannot receive a random access channel sent by the UE. The method comprises the following steps: determining the sending times M of the RACH; and sending the RACH to the network equipment for M times, wherein M is a positive integer. The method is applied to a random access scene.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a random access method, device and system. Background Art

[0002] The New Radio (NR) system supports two types of random access (RA) procedures, namely the 4-step RA type of message queue 1 (MSG1) and the 2-step RA type of message queue A (MSGA). Both types of RA procedures support contention based random access (CBRA) and contention free random access (CFRA).

[0003] For CBRA, the user equipment (UE) can monitor and measure multiple synchronization signal blocks (Synchronization Signal and PBCH block, SSB) or beams, and select an SSB (or beam) with the best signal to reside and receive the transmitted signal, and use the physical random access channel (PRACH) resources associated with the SSB for random access. For CFRA, if the base station specifies the PRACH associated with a certain SSB, the UE selects the specified PRACH resource for random access, otherwise the UE selects the PRACH resource associated with the SSB with the best signal for random access.

[0004] However, for UE with reduced complexity in terms of the number of receiving antennas and transmitting antennas, supported bandwidth, time and ability to process data and signals, i.e., reduced capability UE (RedCap UE), the uplink coverage of the UE will be reduced due to the reduction in the number of transmitting antennas and supported bandwidth. Therefore, during the random access process of the RedCap UE, the base station may not be able to receive the random access channel sent by the Red Cap UE, which may result in the RedCap UE being unable to access the cell. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a random access method, device and system, which can solve the problem that the UE cannot access the cell because the base station cannot receive the random access channel sent by the UE.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, a random access method is provided, which is applied to a UE, and the method includes: determining a number of times M of sending a random access channel (RACH); sending M RACHs to a network device, where M is a positive integer.

[0008] In a second aspect, a random access device is provided, which includes a determination module and a sending module; the determination module is used to determine the number of RACH transmissions M; the sending module is used to send M RACHs to a network device, where M is a positive integer.

[0009] In a third aspect, a random access method is provided, which is applied to a network device. The method includes: on M RACH resources, receiving in combination or independently receiving M RACHs sent by a UE, where M is an integer greater than 1.

[0010] In a fourth aspect, a random access device is provided, comprising a receiving unit; the receiving unit is used to combine and receive or independently receive M RACHs sent by a UE on M RACH resources, where M is an integer greater than 1.

[0011] In a fifth aspect, a UE is provided, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0012] In a sixth aspect, a network device is provided, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the third aspect.

[0013] In a seventh aspect, an embodiment of the present application provides a communication system, the communication system comprising the random access device in the second aspect and the random access device in the fourth aspect. Alternatively, the communication system comprises the UE in the fifth aspect and the network device in the sixth aspect.

[0014] In an eighth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the third aspect are implemented.

[0015] In the ninth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a network device program or instruction to implement the method described in the first aspect, or to implement the method described in the third aspect.

[0016] In an embodiment of the present application, the number of times M that RACH is sent can be determined; and M RACHs are sent to the network device, where M is a positive integer. Through this scheme, during the random access process of the UE, the UE can determine the number of times M that RACH is sent, and determine that after the UE sends M RACHs, the network device can receive the RACH sent by the UE, so that the UE can successfully access the cell. For RedCap UE, the uplink coverage of the RedCap UE can be enhanced by sending multiple RACHs, so that the RedCap UE can access the cell, thereby reducing the delay for the RedCap UE to complete the random access process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a block diagram of a wireless communication system provided by an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of a random access process provided by an embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of a process of establishing a beam pair between a base station and a UE provided in an embodiment of the present application;

[0020] Figure 4 It is a flowchart of a random access method provided by an embodiment of the present application;

[0021] Figure 5 is a structural schematic diagram of a random access device provided in an embodiment of the present application;

[0022] Figure 6 It is a structural diagram of a network device provided in an embodiment of the present application;

[0023] Figure 7 It is a hardware schematic diagram of a communication device provided in an embodiment of the present application;

[0024] Figure 8 is a hardware schematic diagram of a UE provided in an embodiment of the present application;

[0025] Fig. 9 It is a hardware schematic diagram of the network device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0028] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0029] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. However, the following description describes a New Radio (NR) system for illustrative purposes, and the NR terminology is used in most of the following descriptions, although these technologies can also be applied to applications other than NR system applications, such as the 6th generation (6 th Generation, 6G) communication system.

[0030] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes UE11 and a network device 12. Among them, UE 11 can also be called UE device or user UE (User Equipment, UE), UE 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device) or a vehicle-mounted device (VUE), a pedestrian UE (PUE) and other UE-side devices, and wearable devices include: bracelets, headphones, glasses, etc. It should be noted that the specific type of UE11 is not limited in the embodiment of the present application. The network device 12 can be a base station or a core network, wherein the base station can be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0031] The following first explains the relevant technologies involved in the embodiments of the present application.

[0032] In the embodiment of the present application, the triggering cause for the UE to perform random access (or random access) may include the following events:

[0033] 1. Initial access from RRC_IDLE (radio resource control, RRC) idle state;

[0034] 2.RRC Connection Re-establishment procedure;

[0035] 3. When the uplink (UL) synchronization status is "non-synchronized", downlink (DL) data or UL data arrival during RRC_CONNECTED when UL synchronization status is "non-synchronized";

[0036] 4. UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SRavailable;

[0037] 5.SR failure;

[0038] 6. Request by RRC upon synchronous reconfiguration (eg handover);

[0039] 7. Transition from RRC_INACTIVE to RRC_CONNECTED

[0040] 8. To establish time alignment for a secondary TAG;

[0041] 9. Request other system information (SI);

[0042] 10. Beam failure recovery;

[0043] 11. Consistent UL listen before talk (LBT) failure on Special Cell (SpCell).

[0044] In the embodiment of the present application, the NR system supports two types of random access procedures, namely, the 4-step RA type (4-step RACH) of MSG1 and the 2-step RA type (2-step RACH) of MSGA. Both types of RA procedures support CBRA and CFRA, which may include: Figure 2 There are four access processes shown.

[0045] It should be noted that, in the embodiment of the present application, CB and CF may be trigger conditions for the UE to perform RACH.

[0046] In the embodiment of the present application, the UE may select the type of random access when the random access process is started according to the configuration of the network device, specifically:

[0047] - When the network device does not configure CFRA resources for the UE, the UE can select between the 2-step RA type and the 4-step RA type according to the reference signal received power (RSRP) threshold;

[0048] -When the network device configures CFRA resources for 4-step RA type to the UE, the UE can perform random access with 4-step RA type;

[0049] -When the network device configures CFRA resources for the 2-step RA type to the UE, the UE can perform random access with the 2-step RA type.

[0050] In the embodiment of the present application, there is a mapping relationship between PRACH and SSB. Generally, a 5G cell can transmit multiple SSBs, that is, transmit multiple beams in different directions, wherein SSBs with different index numbers (index, also referred to as index values) (ie, SSB index) can correspond to different beams. The UE can monitor and measure these SSBs / beams, and select an SSB or beam with the best signal to reside and send and receive signals. If the UE wants to obtain better uplink and downlink transmission performance, the UE needs to establish a beam pair with the base station (ie, network equipment), which may include a transmitting beam and a receiving beam. Among them,

[0051] Uplink (UE->network device): beam pair means the network device receives beams and the UE sends beams;

[0052] Downlink (network device -> UE): beam pair means that the UE receives the beam and the network device sends the beam.

[0053] In the embodiment of the present application, PRACH resources in different time domains, PRACH resources in different frequency domains or different preambles can be associated with SSB indexes, so that the UE can complete the process of establishing a beam pair with the network device during the initial access process. That is, the network device can determine which SSB is the best downlink beam for the current UE through the detected PRACH resources (including at least one of the time domain and the frequency domain) or the preamble index.

[0054] For example, Figure 3 As shown:

[0055] 1) The cell broadcasts 5 SSBs, whose index numbers (i.e., index values) are SSB 1, SSB 2, SSB 3, SSB 4, and SSB5 respectively;

[0056] 2) The UE determines through measurement that the RSRP of SSB 2 is the strongest. For the UE, the downlink beam pair has been formed at this time (the base station sends beam SSB2, and the UE receives beam), but the network equipment does not know this information yet;

[0057] 3) The UE sends the PRACH associated with SSB 2 in the beam direction corresponding to the SSB 2 with the strongest (largest) RSRP. The UE can select the PRACH resource or the preamble resource according to the association between the PRACH and the SSB index.

[0058] 4) After receiving PRACH (including time domain resources, frequency domain resources and preamble index), the network device can determine that downlink SSB2 is the best (optimal) downlink beam for the UE based on the association relationship (also called mapping relationship) between PRACH and SSB index.

[0059] The random access method provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0060] like Figure 4 As shown, an embodiment of the present application provides a random access method, which includes the following steps 201 to 203.

[0061] Step 201: UE determines the number of times M of sending RACH.

[0062] Wherein, M is a positive integer.

[0063] In the embodiment of the present application, before the UE initiates random access, the UE may first determine the number of RACH transmissions M, and then send M RACHs to the network device according to the number of transmissions M, thereby accessing the cell.

[0064] It should be noted that, in the embodiment of the present application, RACH may be PRACH, which may be determined according to actual use requirements and is not limited in the embodiment of the present application.

[0065] Optionally, in the embodiment of the present application, the UE may determine the number of transmissions M through different determination methods. Specifically, the determination method of the UE to determine the number of transmissions M may include the following determination method 1, determination method 2, and determination method 3. The following are exemplary descriptions of these three determination methods.

[0066] Determination method 1: The UE obtains the number of transmissions M from the first information sent by the network device.

[0067] The first information may include at least one of the following: a master information block (MIB), a system information block (SIB), an RRC message, and a physical downlink control channel (PDCCH).

[0068] It can be understood that in determination mode 1, the network device can instruct the UE to send 1 or more RACHs (i.e., instruct the UE to send M RACHs) through the above first information. In other words, the network device can explicitly instruct the UE to send the number of RACHs when initiating random access through the first information.

[0069] Optionally, in the embodiment of the present application, when the above-mentioned first information includes PDCCH, the PDCCH may be a PDCCH order (PDCCH order) that triggers RACH.

[0070] Optionally, in an embodiment of the present application, the above-mentioned MIB can be an enhanced MIB of the existing MIB, or a newly introduced MIB; correspondingly, the SIB can be an enhanced SIB of the existing SIB, or a newly introduced SIB; the RRC message can be an enhanced RRC message of the existing RRC message, or a newly introduced RRC message.

[0071] Optionally, in an embodiment of the present application, when the UE is a RedCap UE, the MIB may be a newly introduced MIB, the SIB may be a newly introduced SIB, the RRC message may be a newly introduced RRC message, and the PDCCH may be a newly introduced PDCCH.

[0072] Determination method two: The UE determines the number of transmissions M based on the N SSBs sent by the network device that meet the first preset condition.

[0073] It can be understood that in the second determination method, the network device can instruct the UE to send one or more RACHs (i.e., instruct the UE to send M RACHs) through the SSB sent to the UE. In other words, the network device can implicitly instruct the UE to send the number of RACHs when initiating random access through the SSB sent to the UE.

[0074] In an embodiment of the present application, the above-mentioned N SSBs may be SSBs that meet the first preset condition among the SSBs sent in an SSB transmission cycle of the network device (an SSB transmission cycle of the network device assumed by the UE).

[0075] It should be noted that in an embodiment of the present application, the UE may assume that the SSB transmission period of the network device is 20 milliseconds (ms), while the actual SSB transmission period of the network device may be 5ms or 10ms. Therefore, the UE may receive multiple SSBs in one SSB transmission period of the assumed network device.

[0076] Optionally, in the embodiment of the present application, the first preset condition may include at least one of the following:

[0077] The index values ​​of SSB are the same;

[0078] Transmission on a physical broadcast channel (PBCH) having the same demodulation reference signal (DMRS);

[0079] The index value of the SSB is the same as the value modulo the quasi co-location (QCL) of the SSB;

[0080] The DMRS of the PBCH transmitting the SSB has the same value modulo the QCL of the SSB;

[0081] Determined based on the RSRP of the SSB;

[0082] UE confirmed;

[0083] Predefined.

[0084] It should be noted that, in the embodiment of the present application, when the above-mentioned first preset condition includes "the index value of the SSB is the same", the above-mentioned N SSBs may be SSBs with the same SSB index; when the first preset condition includes "transmitted on a PBCH with the same DMRS", the DMRS in the PBCH transmitting the N SSBs are the same (specifically, the DMRS in the PBCH transmitting the N SSBs have the same sequence); when the first preset condition includes "the index value of the SSB is the same as the value modulo the QCL of the SSB", the above-mentioned N SSBs are transmitted by the formula The obtained value / result is the same; when the first preset condition includes "the value of the DMRS of the PBCH transmitting the SSB modulo the QCL of the SSB is the same", the above N SSBs are calculated by the formula The values / results obtained are the same.

[0085] Among them, the DMRS of the PBCH transmitting SSB (i.e. ) can be carried in PBCH. ) can be a predefined value, and different subcarrier spacing (SCS) corresponds to Can be different. The specific value of can be shown in the following Table 1.

[0086] Table 1

[0087]

[0088] Optionally, in an embodiment of the present application, when the UE receives multiple SSBs sent by the network device in one SSB transmission cycle, the UE may determine the above-mentioned N SSBs according to actual usage requirements (that is, the above-mentioned N SSBs may be SSBs determined by the UE); the UE may also determine the above-mentioned N SSBs according to the RSRP of the multiple SSBs (that is, the above-mentioned N SSBs are the SSBs determined by the UE according to the RSRP of the SSBs), and the UE may also select a predefined (for example, specified by the protocol) SSB (that is, the above-mentioned N SSBs are predefined SSBs).

[0089] Exemplarily, assume that the UE receives 6 SSBs sent by the network device within one SSB transmission cycle, including 3 times of SSB#1 (ie, N1=3) and 3 times of SSB#2 (ie, N2=3).

[0090] Then, when the first preset condition is determined by the UE: the UE may select N=N1, N=N2 or N=N1+N2 according to the implementation of the UE, which may be specifically determined by the UE;

[0091] When the first preset condition is determined according to the RSRP of the SSB: the UE may select the SSB with a larger RSRP (i.e., stronger), for example, if the RSRP of SSB#1>the RSRP of SSB#2, then select SSB#1 (i.e., N=N1); if the RSRP of SSB#1=the RSRP of SSB#2, then select the SSB with a smaller or larger SSB index value (SSB index), or the UE may autonomously decide to select SSB#1 or SSB#2;

[0092] When the above-mentioned first preset condition is predefined: the UE can select SSB from SSB#1 and SSB#2 according to the predefined conditions (for example, protocol provisions). If the protocol stipulates that all selections are allowed, the UE can select SSB#1 and SSB#2 (ie, N=N1+N2).

[0093] Optionally, in the above-mentioned determination method 2, the UE may use the above-mentioned N SSBs to perform combined measurement of signals.

[0094] Optionally, in the above determination method 2, the number of sending times M may be equal to N, that is, M=N.

[0095] It should be noted that in the embodiment of the present application, in the above-mentioned determination method 1 and determination method 2, the number of sending times M is determined according to the indication of the network device (explicit indication or implicit indication), that is, the method for determining the number of sending times M is determined according to the indication of the network device.

[0096] Determination method three: The UE determines the number of transmissions M based on the RSRP measured from the SSB sent by the network device.

[0097] In the embodiment of the present application, in the above-mentioned method three, the UE can determine the number of transmissions M based on the RSRP of the SSB measured by it to determine whether the network device can receive the RACH sent by the UE.

[0098] It should be noted that the RSRP of the SSB involved in determining method three is the RSRP of a single SSB.

[0099] In addition, in the above determination method three, the number of transmissions M is determined based on the RSRP of the SSB measured by the UE, that is, the number of transmissions M is determined based on the measurement results of the UE.

[0100] Optionally, for the above determination method 3, the implementation method of the UE determining the number of transmission times M may include two possible methods, namely, method 1 and method 2. The two possible methods are exemplarily described below.

[0101] Mode 1: If the sum of Q RSRPs is greater than or equal to the first threshold, the number of transmission times M is determined to be Q, that is, M=Q.

[0102] Wherein, Q is a positive integer, and Q is less than or equal to the maximum number of transmission times of RACH (hereinafter denoted as M_max), that is, Q≤M_max.

[0103] It can be understood that in the above method 1, the number of transmissions M can satisfy the following formula:

[0104]

[0105] Among them, RSRP-ThresholdSSB can be the above-mentioned first threshold, which represents the threshold value of RSRP of SSB.

[0106] It should be noted that in method 1, for the SSB measured by the UE, if the sum of the RSRPs of the M_max SSBs is still less than the first threshold, the UE can determine that the network device cannot receive the RACH sent through the SSB, so the UE can abandon the SSB and re-measure other SSBs.

[0107] Optionally, in an embodiment of the present application, the maximum number of transmissions of the RACH (ie, M_max) may be a preset number of transmissions corresponding to the RSRP of the SSB.

[0108] In the embodiment of the present application, the RSRP of the SSB is different, and M_max may be different. The value of M_max may refer to the value shown in Table 2.

[0109] Table 2

[0110]

[0111] Mode 2: If the RSRP of the SSB is greater than or equal to the second threshold, the UE may determine that the number of transmissions M is the first preset number; or,

[0112] If the RSRP of the SSB is greater than or equal to the third threshold and less than the second threshold, the UE may determine that the number of transmissions M is the second preset number of times; or

[0113] If the RSRP of the SSB is less than the third threshold, the UE may determine that the number of transmissions M is a third preset number of times;

[0114] The second threshold may be greater than the third threshold, the first preset number may be less than the second preset number, and the second preset number may be less than the third preset number.

[0115] It can be understood that in method 2, after the UE measures the RSRP of the SSB, the UE can directly determine the number of transmissions M according to the interval in which the RSRP of the SSB is located.

[0116] Exemplarily, assuming that the second threshold is X1 decibel (dB), the second threshold is X2dB, the first preset number is 2, the second preset number is 4, and the third preset number is 8. Then when the RSRP of the SSB is higher than X1dB, the UE can determine that the number of transmissions M=2; when the RSRP of the SSB is lower than X1dB and higher than X2dB, the UE can determine that the number of transmissions M=4; otherwise, the UE can determine that the number of transmissions M=8.

[0117] Step 202: The UE sends M RACHs to the network device.

[0118] In the embodiment of the present application, after the UE determines the above-mentioned number of transmissions M, the UE may send M RACHs to the network device, thereby initiating random access.

[0119] Optionally, in the embodiment of the present application, the above step 202 can be specifically implemented by the following step 202a.

[0120] Step 202a: The UE sends a RACH on each of the M RACH resources.

[0121] In the embodiment of the present application, after the UE determines the number of transmissions M, the UE may transmit a RACH once on each of the M RACH resources, thereby transmitting M RACHs to the network device.

[0122] In the embodiment of the present application, the RACH resource may be a PRACH resource, which may be determined according to actual usage requirements and is not limited in the embodiment of the present application.

[0123] It should be noted that, in the embodiment of the present application, the M RACH resources may include time domain resources, frequency domain resources and code domain resources, wherein the code domain resources may include a preamble index value (preamble index) of Msg.1.

[0124] Optionally, in the embodiment of the present application, the preamble index of each RACH resource in the above M RACH resources may be completely the same, partially the same, or completely different, which may be determined according to actual use requirements and is not limited in the embodiment of the present application.

[0125] Optionally, in an embodiment of the present application, the above-mentioned M RACH resources may be resources associated with N SSBs sent by the network device that meet the first preset condition, and the M RACH resources are time division multiplexed (TDMed) resources.

[0126] It should be noted that the above-mentioned N SSBs may be the SSBs used when the UE accesses a cell.

[0127] In addition, for the description of the first preset condition, please refer to the detailed description of the first preset condition in the above embodiment. To avoid repetition, it will not be repeated here.

[0128] Optionally, in the embodiment of the present application, the M RACH resources may be continuous in the time domain and time-division multiplexed resources.

[0129] In the embodiment of the present application, the UE does not expect that the PRACH resources associated with any two SSBs of the N SSBs that meet the first preset condition sent by the network device are frequency division multiplexed (FDMed) and / or code division multiplexed (CDMed) resources, or the UE does not expect any SSB of the N SSBs to be associated with multiple time division multiplexed (TDMed) PRACH resources. If this happens, the UE can select the PRACH resource according to actual usage requirements.

[0130] It should be noted that code division multiplexing resources refer to resources using different preamble indexes on the same time-frequency resources.

[0131] Optionally, in a possible implementation, if there is at least one RACH resource that is code division multiplexed and / or frequency division multiplexed among the RACH resources associated with N SSBs that meet the first preset condition sent by the network device, the UE sends a RACH once on one of the RACH resources associated with the N SSBs.

[0132] It can be understood that if there are RACH resources (specifically PRACH resources) corresponding to one or more SSBs among the above N SSBs that are frequency division multiplexed and / or code division multiplexed resources, the UE selects one RACH resource from these RACH resources to send RACH.

[0133] Exemplarily, the UE may select one PRACH resource according to actual implementation, or the UE may select a PRACH resource associated with a smaller / larger SSB (specifically, an SSB index), or the UE may select a PRACH resource associated with an SSB with a larger (stronger) RSRP. The specific method may be determined according to actual usage requirements, and the embodiments of the present application are not limited thereto.

[0134] Optionally, in another possible implementation, if there is at least one first SSB among the N SSBs sent by the network device that meet the first preset condition, the UE can send a RACH once on each of the M RACH resources in the RACH resources associated with the N SSBs.

[0135] Among them, each of the at least one first SSB can be an SSB associated with multiple time-division multiplexed RACH resources, and the M RACH resources can include at least one RACH resource among the RACH resources associated with the at least one first SSB.

[0136] It can be understood that if at least one of the N SSBs is associated with K (K>1) PRACH resources, and the K PRACH resources are time-division multiplexed resources, the UE can send a PRACH on all of the K PRACH resources, or the UE can send a PRACH on k (1≤k<K) PRACH resources.

[0137] Optionally, in the embodiments of the present application, the UE can select k PRACH resources from the K PRACH resources according to actual usage requirements, or the UE can select the k PRACH resources that appear first or last in time among the K PRACH resources. It can be specifically determined according to actual usage requirements, and the embodiments of the present application do not make any limitations.

[0138] Optionally, in the embodiments of the present application, the resources for sending the M RACHs can be determined in different ways, specifically including the following determination method a and determination method b.

[0139] Determination method a: The resources for sending the M RACHs (i.e., the M RACH resources) can be determined according to the first information.

[0140] Determination method b: The resources for sending the M RACHs can have a first association relationship with the N SSBs sent by the network device that meet the first preset condition.

[0141] Among them, the first association relationship can be determined according to the first information, and the first information can include at least one of the following: MIB, SIB, RRC message, PDCCH.

[0142] It should be noted that in the embodiments of the present application, for the relevant descriptions of the MIB, SIB, RRC message, and PDCCH, reference can be specifically made to the detailed descriptions in the above embodiments. To avoid repetition, they will not be elaborated here.

[0143] Next, taking the PRACH resources and SSBs as examples, an exemplary description of the determination method b is given.

[0144] Exemplarily, for a traditional UE, the UE can determine based on the above-mentioned first association relationship: the PRACH resource associated with SSB#1 is PRACH#1, the PRACH resource associated with SSB#2 is PRACH#1, the PRACH resource associated with SSB#3 is PRACH#3, and the PRACH resource associated with SSB#4 is PRACH#4.

[0145] As another example, for a RedCap UE, if it uses SSB#1 and SSB#2 for beam pair, the UE can determine based on the above-mentioned first association relationship: the PRACH resource associated with SSB#1 and SSB#2 is PRACH#5, wherein the RedCap UE can send x1 times (for example, x1>=2) PRACH on PRACH#5; or, the PRACH resources associated with SSB#1 and SSB#2 are PRACH#5 and PRACH#6, wherein the RedCap UE can send x2 times (for example, x2>=1) on PRACH#5 and x3 times (for example, x3>=1) on PRACH#6.

[0146] Optionally, in the embodiment of the present application, the RACH resources configured by the network device for the RedCap UE and the RACH resources configured for the traditional UE may be independent and non-overlapping resources, that is, at least one of the time domain, frequency domain, and code domain of these resources is different. Thus, the network device can distinguish whether the UE initiating random access is a ReCap UE or a traditional UE by detecting the RACH resources.

[0147] Step 203: The network device receives M RACHs sent by the UE in combination or independently on M RACH resources.

[0148] Wherein, M is an integer greater than 1.

[0149] In the embodiment of the present application, after the UE sends M RACHs, the network device may receive the M RACHs sent by the UE in a combined manner or independently on M RACH resources.

[0150] It should be noted that, in the embodiment of the present application, when M=1, the network device can directly receive the RACH sent by the UE.

[0151] Optionally, in the embodiment of the present application, if the preamble index values ​​(preamble index) corresponding to the M RACH resources are different, then the manner in which the network device receives the M RACHs sent by the UE may be different.

[0152] Case 1: If the preamble sequence index values ​​corresponding to the M RACH resources are the same, the network device can receive M RACHs sent by the UE in combination or independently on the M RACH resources.

[0153] In the embodiment of the present application, if the preamble indexes corresponding to the above-mentioned M RACH resources (specifically, M PRACH resources) are the same, then the network device can receive the transmission of the M RACHs in combination or independently, that is, on the M RACH resources, receive the M RACHs sent by the UE in combination or independently.

[0154] Case 2: If the preamble sequence index values ​​corresponding to the M RACH resources are different, the network device can independently receive M RACHs sent by the UE on the M RACH resources.

[0155] In the embodiment of the present application, if the preamble indexes corresponding to the above-mentioned M RACH resources (specifically, M PRACH resources) are different, then the network device can independently receive the transmission of the M RACHs, that is, independently receive M RACHs sent by the UE on the M RACH resources.

[0156] Optionally, in the embodiment of the present application, the above step 203 can be specifically implemented by the following steps 203a and 203b.

[0157] Step 203a: The network device determines the type of UE according to the M RACH resources.

[0158] Step 203b: The network device receives M RACHs sent by the UE in combination or independently on M RACH resources according to the type of the UE.

[0159] In an embodiment of the present application, if the RACH resources configured for the RedCap UE and the RACH resources configured for the traditional UE are independent and non-overlapping resources, that is, at least one of the time domain, frequency domain, and code domain of these resources is different, then the network device can determine whether the UE initiating random access (that is, the UE sending the RACH) is a ReCap UE or a traditional UE based on the above-mentioned M RACH resources, so that the network device can choose to combine the reception or independently receive the M RACHs sent by the UE.

[0160] For example, when the network device determines that the UE for random access is a ReCap UE, the network device can combine and receive M RACHs sent by the UE. If the network device determines that the UE for random access is a traditional UE, the network device can independently receive M RACHs sent by the UE.

[0161] Optionally, in an embodiment of the present application, if the network device cannot determine whether the UE initiating random access is a RedCap UE or a traditional UE based on the above-mentioned M RACH resources, then the network device can independently receive the M RACHs sent by the UE. In this case, the network device can determine whether the UE initiating random access is a RedCap UE or a traditional UE in subsequent transmissions (e.g., Msg.3 in 4-step RACH or Msg.APUSCH in 2-step RACH).

[0162] It should be noted that, in the embodiment of the present application, if the RACH resources configured by the network device for the RedCap UE and the RACH resources configured for the traditional UE are overlapping resources, the network device cannot determine the type of UE initiating random access through the RACH resources.

[0163] The embodiment of the present application provides a random access method. During the random access process of the UE, the UE can determine the number of times M that the RACH is sent, and determine that after the UE sends M RACHs, the network device can receive the RACH sent by the UE, so that the UE can successfully access the cell. For RedCap UE, the uplink coverage of the RedCap UE can be enhanced by sending multiple RACHs, so that the RedCap UE can access the cell, thereby reducing the delay of the RedCap UE to complete the random access process.

[0164] Optionally, in the embodiment of the present application, before the above step 201, the random access method provided in the embodiment of the present application may further include the following step 204. The above step 201 may be specifically implemented by the following step 201a.

[0165] Step 204: The UE determines a method for determining the number of transmission times M according to the triggering condition of the RACH.

[0166] The above determination method may be determined according to an instruction of a network device, or may be determined according to a measurement result of a UE.

[0167] Step 201a: The UE determines the number of transmission times M according to the determination method.

[0168] In the embodiment of the present application, before the UE determines the above-mentioned number of transmissions M, the UE may first determine a determination method for the number of transmissions M according to the triggering condition of the RACH, and then determine the number of transmissions M using a determination method corresponding to the triggering condition of the RACH.

[0169] It should be noted that when the above-mentioned determination method is "determined according to the indication of the network device", the relevant description of the determination method can be found in the detailed description of determination method one and determination method two in the above-mentioned embodiment; when the above-mentioned determination method is "determined according to the measurement result of the UE", the relevant description of the determination method can be found in the detailed description of determination method three in the above-mentioned embodiment. To avoid repetition, it will not be repeated here.

[0170] Optionally, in an embodiment of the present application, the triggering conditions of the RACH may include CFRA (i.e., contention-free random access) and CBRA (i.e., contention-based random access).

[0171] Optionally, in an embodiment of the present application, when the trigger condition of RACH is CFRA, the above determination method may be determined according to an instruction of a network device; when the trigger condition of RACH is CBRA, the above determination method may be determined according to an instruction of a network device, or may be determined according to a measurement result of a UE.

[0172] Exemplarily, for CFRA, the number of transmissions M may be indicated by a PDCCH order or configured by an RRC message; for CBRA, if the SIB indicates the number of transmissions M, the UE determines the M value indicated by the SIB as the number of transmissions M, otherwise, the UE determines the number of transmissions M based on the measured SSB.

[0173] Optionally, in an embodiment of the present application, for the above-mentioned M RACH resources, if the QCLs (quasi co-locations) corresponding to the above-mentioned M RACH resources are different, then the beam directions of RACH sent by the UE on the M RACH resources may be different. Specifically, two implementation methods may be included, namely, the first method and the second method. The following are exemplary descriptions of these two possible implementation methods.

[0174] Method 1: If the above-mentioned M RACH resources correspond to the same QCL, the beam direction of sending the M RACHs on the M RACH resources is the beam direction corresponding to the second SSB (specifically, it can be the beam direction corresponding to the index value of the second SSB).

[0175] Among them, the above-mentioned second SSB can meet at least one of the following conditions: the index value of SSB is maximum / minimum, and the RSRP of SSB is maximum.

[0176] Optionally, in the embodiment of the present application, when there are multiple SSBs with larger RSRP, the UE can determine the second SSB according to the SSB index. For example, the UE can select the SSB with the smallest or largest SSB index among the multiple SSBs as the second SSB. The specific determination can be based on actual usage requirements, and the embodiment of the present application is not limited.

[0177] The second method: If the above M RACH resources correspond to different QCLs, the beam directions for transmitting M RACHs on these M RACH resources have a second association relationship with the third SSB.

[0178] Among them, the above second association relationship can be determined according to the first information.

[0179] It should be noted that in the embodiments of the present application, for the relevant description of the above first information, specific details can be referred to the detailed description in the above embodiments. To avoid repetition, it will not be elaborated here.

[0180] Exemplarily, the first information (such as at least one of MIB, SIB, RRC message, PDCCH) can indicate that y1 (1 <= y1 < M) PRACH resources are related to SSB#i, y2 (1 <= y2 < M) PRACH resources are related to SSB#j, and i ≠ j, y1 + y2 + ym = M (m = 1, 2, 3). Then, the UE can determine the beam directions for transmitting M RACHs according to the beam directions corresponding to SSB#i and SSB#j.

[0181] It should be noted that for the random access method provided in the embodiments of the present application, the execution entity can be a random access device, or a control module or functional module in the random access device for executing the random access method. In the embodiments of the present application, the random access method is executed by the random access device as an example to illustrate the random access device provided in the embodiments of the present application.

[0182] As Figure 5 shown, the embodiments of the present application provide a random access device 300, which includes a determination module 301 and a transmission module 302. The determination module 301 is used to determine the number of transmissions M of the RACH; the transmission module 302 is used to send the RACH M times to the network device, where M is a positive integer.

[0183] Optionally, the determination module 301 is specifically configured to obtain the number of transmissions M from the first information sent by the network device; where the first information includes at least one of the following: MIB, SIB, RRC message, PDCCH.

[0184] Optionally, the determination module 301 is specifically configured to determine the number of transmissions M according to N SSBs sent by the network device that meet the first preset condition.

[0185] Optionally, the determination module 301 is specifically configured to determine the number of transmissions M according to the RSRP measured on the SSB sent by the network device.

[0186] Optionally, the determination module 301 is specifically configured to determine that the number of transmissions M is Q if the sum of Q RSRPs is greater than or equal to a first threshold, where Q is a positive integer and is less than or equal to a maximum number of transmissions of RACH.

[0187] Optionally, the maximum number of transmissions is a preset number of transmissions corresponding to RSRP.

[0188] Optionally, the determination module 301 is specifically used to determine that the number of transmissions M is a first preset number of times if the RSRP is greater than or equal to a second threshold; or, the determination module 301 is specifically used to determine that the number of transmissions M is a second preset number of times if the RSRP is greater than or equal to a third threshold and less than the second threshold; or the determination module 301 is specifically used to determine that the number of transmissions M is a third preset number of times if the RSRP is less than a third threshold; wherein the second threshold is greater than the third threshold, the first preset number is less than the second preset number, and the second preset number is less than the third preset number.

[0189] Optionally, the determination module 301 is further used to determine a method for determining the number of transmission times M according to a trigger condition of the RACH before determining the number of transmission times M of the RACH, wherein the determination method is determined according to an instruction of a network device or determined according to a measurement result of a UE; the determination module 301 is specifically used to determine the number of transmission times M according to the determination method.

[0190] Optionally, the sending module 302 is specifically configured to send a RACH once on each RACH resource of the M RACH resources.

[0191] Optionally, the M RACH resources are resources associated with N SSBs sent by the network device that meet the first preset condition, and the M RACH resources are time-division multiplexed resources.

[0192] Optionally, the sending module 302 is specifically used to send a RACH once on one of the RACH resources associated with the N SSBs if there is at least one RACH resource of code division multiplexing and / or frequency division multiplexing among the RACH resources associated with the N SSBs that meet the first preset condition sent by the network device.

[0193] Optionally, the sending module 302 is specifically used to send a RACH once on each of the M RACH resources in the RACH resources associated with the N SSBs if there is at least one first SSB among the N SSBs sent by the network device that meet the first preset condition; wherein each first SSB is an SSB associated with multiple time-division multiplexed RACH resources, and the M RACH resources include at least one RACH resource among the RACH resources associated with at least one first SSB.

[0194] Optionally, resources for sending M RACHs are determined based on first information; or, resources for sending M RACHs have a first association relationship with N SSBs sent by the network device that meet a first preset condition, and the first association relationship is determined based on the first information; wherein the first information includes at least one of the following: MIB, SIB, RRC message, PDCCH.

[0195] Optionally, the first preset condition includes at least one of the following:

[0196] The index values ​​of SSB are the same;

[0197] Transmitted on PBCH with the same DMRS;

[0198] The index value of SSB is the same as the value modulo the QCL of SSB;

[0199] The DMRS of the PBCH transmitting the SSB has the same value modulo the QCL of the SSB;

[0200] Determined based on the RSRP of the SSB;

[0201] Random access device determination;

[0202] Predefined.

[0203] Optionally, if M RACH resources correspond to the same QCL, the beam direction of sending M RACHs on the M RACH resources is the beam direction corresponding to the second SSB, and the second SSB satisfies at least one of the following conditions: the index value of the SSB is maximum / minimum, and the RSRP of the SSB is maximum; or, if the M RACH resources correspond to different QCLs, the beam direction of sending M RACHs on the M RACH resources has a second association relationship with the third SSB, and the second association relationship is determined based on the first information.

[0204] The random access device provided in the embodiment of the present application can implement each process performed by the UE in the above-mentioned random access method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0205] The embodiment of the present application provides a random access device. During the random access process of the UE, the random access device can determine the number of times M of RACH transmission and determine that after M RACH transmissions, the network device can receive the RACH transmitted by the UE, so that the UE can successfully access the cell. For RedCap UE, the uplink coverage of the RedCap UE can be enhanced by transmitting multiple RACHs, so that the RedCap UE can access the cell, thereby reducing the delay of the RedCap UE to complete the random access process.

[0206] The random access device in the embodiment of the present application may be a device, or a component, an integrated circuit, or a chip in a UE. The device may be a mobile UE or a non-mobile UE. For example, the mobile UE may include but is not limited to the types of UE 11 listed above, and the non-mobile UE may be a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0207] The random access device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0208] The random access device provided in the embodiment of the present application can implement each process that the UE can implement in the above method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0209] Optionally. Figure 6 As shown, an embodiment of the present application provides a random access device 400, which includes a receiving unit 401. The receiving unit 401 is used to receive M RACHs sent by a UE in combination or independently on M RACH resources, where M is an integer greater than 1.

[0210] Optionally, the receiving unit 401 is specifically configured to, if the preamble sequence index values ​​corresponding to the M RACH resources are the same, receive M RACHs sent by the UE on the M RACH resources in combination or independently; or,

[0211] The receiving unit 401 is specifically configured to independently receive M RACHs sent by the UE on the M RACH resources if the preamble sequence index values ​​corresponding to the M RACH resources are different.

[0212] Optionally, the receiving unit includes a determining subunit and a receiving subunit; the determining subunit is used to determine the type of UE according to M RACH resources; the receiving subunit is used to combine and receive or independently receive M RACHs sent by the UE on the M RACH resources according to the type of UE determined by the determining subunit.

[0213] An embodiment of the present application provides a random access device. Since the random access device can combine and receive or independently receive M RACHs sent by a UE on M RACH resources, the random access device can determine the type of the UE initiating random access according to the manner of receiving the M RACHs sent by the UE, so that the UE can successfully access the cell.

[0214] Alternatively, if Figure 7 As shown, the embodiment of the present application further provides a communication device 500, including a processor 501, a memory 502, and a program or instruction stored in the memory 502 and executable on the processor 501. For example, when the communication device 500 is a UE, the program or instruction is executed by the processor 501 to implement each process of the above-mentioned random access method embodiment, and can achieve the same technical effect. When the communication device 500 is a network device, the program or instruction is executed by the processor 501 to implement each process of the above-mentioned random access method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0215] Figure 8 A schematic diagram of the hardware structure of a UE for implementing an embodiment of the present application.

[0216] The UE 100 includes but is not limited to components such as a radio frequency unit 101, a network module 102, an audio output unit 103, an input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, and a processor 110.

[0217] Those skilled in the art will appreciate that UE 100 may also include a power source (such as a battery) for supplying power to various components, and the power source 111 may be logically connected to the processor 110 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 8 The UE structure shown in the figure does not constitute a limitation on the UE. The UE may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0218] It should be understood that in the embodiment of the present application, the input unit 104 may include a graphics processor (Graphics Processing Unit, GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 107 includes a touch panel 1071 and other input devices 1072. The touch panel 1071 is also called a touch screen. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0219] In the embodiment of the present application, the radio frequency unit 101 receives downlink data from the network device and sends it to the processor 110 for processing; in addition, the uplink data is sent to the network device. Generally, the radio frequency unit 101 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0220] The memory 109 can be used to store software programs or instructions and various data. The memory 109 can mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area can store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 109 can include a high-speed random access memory, and can also include a non-volatile memory, wherein the non-volatile memory can be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0221] The processor 110 may include one or more processing units; optionally, the processor 110 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, etc., and the modem processor mainly processes wireless communications, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 110.

[0222] The processor 110 is used to determine the number of times M that RACH is sent; the radio frequency unit 101 is used to send M times of RACH to the network device, where M is a positive integer.

[0223] Optionally, the processor 110 is specifically configured to obtain a transmission count M from first information sent by a network device; wherein the first information includes at least one of the following: MIB, SIB, RRC message, PDCCH.

[0224] Optionally, the processor 110 is specifically configured to determine a sending count M based on N SSBs sent by the network device that meet a first preset condition.

[0225] Optionally, the processor 110 is specifically configured to determine the number of transmissions M according to an RSRP obtained by measuring an SSB sent by the network device.

[0226] Optionally, the processor 110 is specifically configured to determine that the number of transmissions M is Q if the sum of Q RSRPs is greater than or equal to a first threshold, where Q is a positive integer and is less than or equal to a maximum number of transmissions of the RACH.

[0227] Optionally, the maximum number of transmissions is a preset number of transmissions corresponding to RSRP.

[0228] Optionally, the processor 110 is specifically used to determine that the number of transmissions M is a first preset number of times if the RSRP is greater than or equal to a second threshold; or the determination module 301 is specifically used to determine that the number of transmissions M is a second preset number of times if the RSRP is greater than or equal to a third threshold and less than the second threshold; or the determination module 301 is specifically used to determine that the number of transmissions M is a third preset number of times if the RSRP is less than a third threshold; wherein the second threshold is greater than the third threshold, the first preset number is less than the second preset number, and the second preset number is less than the third preset number.

[0229] Optionally, the processor 110 is further used to determine a method for determining the number of times M of sending RACH according to a trigger condition of RACH before determining the number of times M of sending RACH, where the determination method is determined according to an instruction of a network device or according to a measurement result of a UE; the processor 110 is specifically used to determine the number of times M of sending according to the determination method.

[0230] Optionally, the sending module 302 is specifically configured to send a RACH once on each RACH resource of the M RACH resources.

[0231] Optionally, the M RACH resources are resources associated with N SSBs sent by the network device that meet the first preset condition, and the M RACH resources are time-division multiplexed resources.

[0232] Optionally, the radio frequency unit 101 is specifically used to send a RACH once on one of the RACH resources associated with the N SSBs if there is at least one RACH resource that is code division multiplexed and / or frequency division multiplexed among the RACH resources associated with N SSBs that meet the first preset condition sent by the network device.

[0233] Optionally, the radio frequency unit 101 is specifically used to send a RACH once on each of M RACH resources among the RACH resources associated with the N SSBs if there is at least one first SSB among the N SSBs sent by the network device that meet the first preset condition; wherein each first SSB is an SSB associated with multiple time-division multiplexed RACH resources, and the M RACH resources include at least one RACH resource among the RACH resources associated with at least one first SSB.

[0234] Optionally, resources for sending M RACHs are determined based on first information; or, resources for sending M RACHs have a first association relationship with N SSBs sent by the network device that meet a first preset condition, and the first association relationship is determined based on the first information; wherein the first information includes at least one of the following: MIB, SIB, RRC message, PDCCH.

[0235] Optionally, the first preset condition includes at least one of the following:

[0236] The index values ​​of SSB are the same;

[0237] Transmitted on PBCH with the same DMRS;

[0238] The index value of SSB is the same as the value modulo the QCL of SSB;

[0239] The DMRS of the PBCH transmitting the SSB has the same value modulo the QCL of the SSB;

[0240] Determined based on the RSRP of the SSB;

[0241] UE confirmed;

[0242] Predefined.

[0243] Optionally, if M RACH resources correspond to the same QCL, the beam direction of sending M RACHs on the M RACH resources is the beam direction corresponding to the second SSB, and the second SSB satisfies at least one of the following conditions: the index value of the SSB is maximum / minimum, and the RSRP of the SSB is maximum; or, if the M RACH resources correspond to different QCLs, the beam direction of sending M RACHs on the M RACH resources has a second association relationship with the third SSB, and the second association relationship is determined based on the first information.

[0244] The embodiment of the present application provides a UE, because in the random access process of the UE, the UE can determine the number of times M of RACH transmission, and determine that after the UE sends M RACHs, the network device can receive the RACH sent by the UE, so that the UE can successfully access the cell. For RedCap UE, the uplink coverage of the RedCap UE can be enhanced by sending multiple RACHs, so that the RedCap UE can access the cell, thereby reducing the delay of the RedCap UE to complete the random access process.

[0245] It should be noted that in the embodiment of the present application, the structural diagram of the random access device (for example, the above Figure 5) can be implemented by the above-mentioned processor 110; the sending module 302 in the structural diagram of the above-mentioned random access device can be implemented by the above-mentioned radio frequency unit 301.

[0246] Specifically, the embodiment of the present application also provides a network device. Fig. 9 As shown, the network device 600 includes: an antenna 61, a radio frequency device 62, and a baseband device 63. The antenna 61 is connected to the radio frequency device 62. In the uplink direction, the radio frequency device 62 receives information through the antenna 61 and sends the received information to the baseband device 63 for processing. In the downlink direction, the baseband device 63 processes the information to be sent and sends it to the radio frequency device 62. The radio frequency device 62 processes the received information and sends it out through the antenna y1.

[0247] The radio frequency device 62 may be used to receive, in combination or independently, M RACHs sent by the UE on M RACH resources, where M is an integer greater than 1.

[0248] Optionally, the radio frequency device 62 is specifically used to combine and receive or independently receive M RACHs sent by the UE on the M RACH resources if the preamble sequence index values ​​corresponding to the M RACH resources are the same; or, the radio frequency device 62 is specifically used to independently receive M RACHs sent by the UE on the M RACH resources if the preamble sequence index values ​​corresponding to the M RACH resources are different.

[0249] Optionally, the radio frequency device 62 is specifically configured to determine the type of the UE according to the M RACH resources; and according to the type of the UE, receive M RACHs sent by the UE in combination or independently on the M RACH resources.

[0250] An embodiment of the present application provides a network device. Since the network device can receive M RACHs sent by a UE in combination or independently on M RACH resources, the network device can determine the type of UE initiating random access according to the manner of receiving the M RACHs sent by the UE, so that the UE can successfully access the cell.

[0251] It should be noted that in the embodiment of the present application, the structural diagram of the random access device (for example, the above Figure 6 ) can be implemented by the above-mentioned radio frequency device 62.

[0252] The frequency band processing device may be located in a baseband device 63 . The method performed by the network device in the above embodiment may be implemented in the baseband device 63 . The baseband device 63 includes a processor 64 and a memory 65 .

[0253] The baseband device 63 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig. 9 As shown, one of the chips is, for example, a processor 64, which is connected to a memory 65 to call a program in the memory 55 to execute the network device operations shown in the above method embodiment.

[0254] The baseband device 63 may further include a network interface 66 for exchanging information with the radio frequency device 62 . The interface may be, for example, a common public radio interface (CPRI).

[0255] Specifically, the network device of the embodiment of the present invention further includes: instructions or programs stored in the memory 65 and executable on the processor 64, and the processor 64 calls the instructions or programs in the memory 65 to execute. Fig. 9 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0256] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned random access method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0257] The processor is the processor in the UE in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0258] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a network device program or instruction to implement each process of the above-mentioned random access method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0259] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0260] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0261] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for enabling a UE (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0262] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A random access method, applied to a user equipment UE, characterized in that: The method comprises: Determine a method for determining the number of times M of sending the random access channel RACH according to a triggering condition of the random access channel RACH, wherein the triggering condition of the RACH is a contention-free random access CFRA or a contention-based random access CBRA; According to the determination method, determine the number of transmissions M, where M is a positive integer; Send M RACHs to the network device.

2. The method according to claim 1, characterized in that When the trigger condition of the RACH is CFRA, the determination method is determined according to an RRC message; When the trigger condition of the RACH is CBRA, the determination method is determined according to the RRC message and the measurement result of the UE.

3. The method according to claim 1 or 2, characterized in that: The determining the number of times M of RACH transmissions includes: Obtaining the sending number M from the first information sent by the network device; The first information includes at least one of the following: a master information block MIB, a system information block SIB, a radio resource control RRC message, and a physical downlink control channel PDCCH.

4. The method according to any one of claims 1 to 3, characterized in that: The determining the number of times M of RACH transmissions includes: The number of transmissions M is determined based on the reference signal received power RSRP measured for the SSB sent by the network device.

5. The method according to claim 4, characterized in that The determining the number of transmissions M according to the RSRP obtained by measuring the SSB sent by the network device includes: If the RSRP is greater than or equal to the second threshold, determining the number of transmissions M to be a first preset number; or, If the RSRP is greater than or equal to the third threshold and less than the second threshold, determining the number of transmissions M to be a second preset number; or If the RSRP is less than a third threshold, determining the number of transmissions M to be a third preset number; The second threshold is greater than the third threshold, the first preset number of times is less than the second preset number of times, and the second preset number of times is less than the third preset number of times.

6. The method according to any one of claims 1 to 5, characterized in that: The sending M RACHs to the network device includes: A RACH is sent once on each of the M RACH resources.

7. The method according to any one of claims 1 to 6, characterized in that: The M RACH resources are resources associated with N SSBs sent by the network device and meeting the first preset condition, and the M RACH resources are time division multiplexed resources.

8. The method according to claim 6, characterized in that The sending a RACH on each RACH resource of the M RACH resources includes: If there is at least one RACH resource of code division multiplexing and / or frequency division multiplexing among the RACH resources associated with the N SSBs that meet the first preset condition sent by the network device, a RACH is sent once on one RACH resource among the RACH resources associated with the N SSBs; or, If there is at least one first SSB among the N SSBs sent by the network device that meet the first preset condition, sending a RACH once on each of the M RACH resources among the RACH resources associated with the N SSBs; Each first SSB is an SSB associated with multiple time-division multiplexed RACH resources, and the M RACH resources include at least one RACH resource among the RACH resources associated with the at least one first SSB.

9. The method according to claim 7, characterized in that: The first preset condition includes: the index values ​​of the SSBs are the same.

10. The method according to any one of claims 1 to 7, characterized in that: The M RACH resources correspond to the same QCL.

11. The method according to any one of claims 1 to 10, characterized in that: The beam direction for sending the M RACHs on the M RACH resources is the beam direction corresponding to the second SSB.

12. The method according to claim 11, characterized in that The second SSB is determined according to the RSRP of the SSB or the index of the SSB, and the second SSB satisfies at least one of the following conditions: the index value of the SSB is the largest, the index value of the SSB is the smallest, and the RSRP of the SSB is the largest.

13. A random access device, characterized in that: The random access device comprises a determination module and a sending module; The determining module is used to determine a determination method for the number of transmission times M of the random access channel RACH according to a triggering condition of the random access channel RACH, wherein the triggering condition of the RACH is a contention-free random access CFRA or a contention-based random access CBRA; Used to determine the sending number M according to the determination method, where M is a positive integer; The sending module is used to send M RACHs to the network device.

14. The random access device according to claim 13, characterized in that: When the trigger condition of the RACH is CFRA, the determination method is determined according to an RRC message; When the trigger condition of the RACH is CBRA, the determination method is determined according to the RRC message and the measurement result of the UE.

15. The random access device according to claim 13 or 14, characterized in that: The determining module is specifically configured to obtain the sending number M from the first information sent by the network device; The first information includes at least one of the following: a system information block SIB and a radio resource control RRC message.

16. The random access device according to any one of claims 13 to 15, characterized in that: The determination module is specifically used to determine the number of transmissions M based on the reference signal received power RSRP measured for the SSB sent by the network device.

17. The random access device according to claim 16, characterized in that: The determining module is specifically configured to determine that the number of transmissions M is a first preset number of times if the RSRP is greater than or equal to a second threshold; or The determining module is specifically configured to determine that the number of transmissions M is a second preset number of times if the RSRP is greater than or equal to a third threshold and less than a second threshold; or The determining module is specifically configured to determine that the number of transmissions M is a third preset number of times if the RSRP is less than a third threshold; The second threshold is greater than the third threshold, the first preset number of times is less than the second preset number of times, and the second preset number of times is less than the third preset number of times.

18. The random access device according to any one of claims 13 to 17, characterized in that: The sending module is specifically configured to send a RACH on each of the M RACH resources.

19. The random access device according to claims 13 to 18, characterized in that: The M RACH resources are resources associated with N SSBs sent by the network device and meeting the first preset condition, and the M RACH resources are time-division multiplexed resources.

20. The random access device according to claim 19, characterized in that: The first preset condition includes: the index values ​​of the SSBs are the same.

21. The random access device according to claims 13 to 20, characterized in that: The M RACH resources correspond to the same QCL.

22. The random access device according to any one of claims 13 to 21, characterized in that: The beam direction for sending the M RACHs on the M RACH resources is the beam direction corresponding to the second SSB.

23. The random access device according to claim 22, characterized in that: The second SSB is determined according to the RSRP of the SSB or the index of the SSB, and the second SSB satisfies at least one of the following conditions: the index value of the SSB is the largest, the index value of the SSB is the smallest, and the RSRP of the SSB is the largest.

24. A random access method, applied to a network device, characterized in that: The method comprises: On M random access channel RACH resources, M RACHs sent by user equipment UE are received in combination or independently, where M is an integer greater than 1, and the number of times the RACH is sent is determined according to a determination method corresponding to a trigger condition of the RACH, where the trigger condition of the RACH is contention-free random access CFRA or contention-based random access CBRA.

25. The method according to claim 24, characterized in that When the trigger condition of the RACH is CFRA, the determination method is determined according to an RRC message; When the trigger condition of the RACH is CBRA, the determination method is determined according to the RRC message and the measurement result of the UE.

26. The method according to claim 24 or 25, characterized in that The method also includes: the network side device sends first information, and the first information includes at least one of the following: a system information block SIB and a radio resource control RRC message.

27. The method according to claims 24 to 26, characterized in that The step of receiving, in combination or independently, M RACHs sent by a user equipment UE on M random access channel RACH resources includes: A RACH is received once on each of the M RACH resources.

28. The method according to any one of claims 24 to 27, characterized in that The M RACH resources are resources associated with N SSBs sent by the network device that meet a first preset condition, and the M RACH resources are time division multiplexed resources.

29. The method according to claim 28, characterized in that The first preset condition includes: the index values ​​of the SSBs are the same.

30. The method according to any one of claims 24 to 29, characterized in that The M RACH resources correspond to the same QCL.

31. The method according to any one of claims 24 to 30, characterized in that The beam direction of the M RACHs received on the M RACH resources is the beam direction corresponding to the second SSB, and the second SSB is determined according to the RSRP of the SSB or the index of the SSB.

32. The method according to claim 31, characterized in that The second SSB satisfies at least one of the following conditions: the index value of the SSB is the largest, the index value of the SSB is the smallest, and the RSRP of the SSB is the largest.

33. The method according to any one of claims 24 to 32, characterized in that The preamble sequence index values ​​corresponding to the M RACH resources are the same; or, If the preamble sequence index values ​​corresponding to the M RACH resources are different.

34. A random access device, characterized in that: The random access device comprises a receiving unit; The receiving unit is used to combine and receive or independently receive M RACHs sent by a user equipment UE on M random access channel RACH resources, where M is an integer greater than 1, and the number of times the RACH is sent is determined according to a determination method corresponding to a trigger condition of the RACH, and the trigger condition of the RACH is a contention-free random access CFRA or a contention-based random access CBRA.

35. The random access device according to claim 34, characterized in that: The M RACH resources are resources associated with N SSBs sent by the network device that meet a first preset condition, and the M RACH resources are time division multiplexed resources.

36. The random access device according to claim 35, characterized in that: The first preset condition includes: the index values ​​of the SSBs are the same.

37. The random access device according to any one of claims 34 to 36, characterized in that: The M RACH resources correspond to the same QCL.

38. The random access device according to any one of claims 34 to 37, characterized in that: The beam direction of the M RACHs received on the M RACH resources is the beam direction corresponding to the second SSB.

39. The random access device according to any one of claims 34 to 38, characterized in that: The preamble sequence index values ​​corresponding to the M RACH resources are the same; or, the preamble sequence index values ​​corresponding to the M RACH resources are different.

40. A user equipment UE, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the random access method according to any one of claims 1 to 12.

41. A network device, characterized in that: It includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the random access method as described in any one of claims 24 to 33.

42. A communication system, characterized in that: comprising the random access device according to any one of claims 13 to 23, and the random access device according to any one of claims 34 to 39; or, The communication system comprises the UE according to claim 40 and the network device according to claim 41.

43. A readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the random access method according to any one of claims 1 to 12, or implements the steps of the random access method according to any one of claims 24 to 33.

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