Random access method and apparatus, terminal, and network side device

Abstract

The present application relates to the technical field of communications, and discloses a random access method and apparatus, a terminal, and a network side device. The random access method of embodiments of the present application comprises: a terminal receives a first message; the terminal acquires, on the basis of the first message, PRACH resource configuration information corresponding to a downlink signal combination, and determines a preamble on the basis of the PRACH resource configuration information; and the terminal uses the preamble to send a second message on a PRACH resource associated with a first downlink signal or a first downlink signal combination.

Description

Random access method, device, terminal and network side equipment

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to Chinese Patent Application No. 202411363616.5, filed on September 27, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and specifically relates to a random access method, device, terminal and network side equipment. BACKGROUND

[0004] In a cell free network, due to dense Transmit / Receive Point (TRP) deployment, a terminal can receive or detect multiple downlink signals (such as Synchronization Signal and PBCH block (SSB) signals). In some scenarios, for a random access process of multiple downlink signals, the terminal can only use a repeated sending manner to send a Physical Random Access Channel (PRACH) multiple times on multiple random access occasion resources, resulting in a large terminal overhead. Or in some scenarios, when the terminal needs to trigger a signal (such as an uplink Wake-up signal (UL-WUS)) in the coverage range of multiple downlink signals to be sent, the terminal needs to send the signal multiple times, resulting in a large terminal resource overhead and sending energy consumption overhead. SUMMARY

[0005] Embodiments of the present application provide a random access method, device, terminal and network side equipment, which can solve the problem of a large terminal overhead in the related art that, for a random access process of multiple downlink signals, the terminal repeatedly initiates multiple PRACHs, or when the terminal needs to trigger a signal in the coverage range of multiple downlink signals to be sent, the terminal needs to send the signal multiple times.

[0006] In a first aspect, a random access method is provided, which is performed by a terminal, and the method comprises:

[0007] The terminal receives a first message;

[0008] The terminal obtains physical random access channel (PRACH) resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information;

[0009] The terminal sends a second message using the preamble on PRACH resources associated with the first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0010] In a second aspect, a random access method is provided, which is performed by a network side device, and the method includes:

[0011] The network side device sends a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used by the terminal to determine a preamble;

[0012] The network side device receives a second message sent by the terminal using the preamble on PRACH resources associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0013] In a third aspect, a random access apparatus is provided, which includes:

[0014] A first receiving module is configured to receive a first message.

[0015] A processing module is configured to acquire PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determine a preamble according to the PRACH resource configuration information.

[0016] A first sending module is configured to send a second message using the preamble on PRACH resources associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0017] In a fourth aspect, a random access apparatus is provided, which includes:

[0018] A second sending module is configured to send a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used by the terminal to determine a preamble.

[0019] A second receiving module is configured to receive a second message sent by the terminal using the preamble on PRACH resources associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0020] In a fifth aspect, a random access apparatus is provided, which is configured to perform the steps of the method of the first aspect, or implement the steps of the method of the second aspect.

[0021] In a sixth aspect, a terminal is provided, which comprises a processor and a memory, the memory storing programs or instructions executable on the processor, which when executed by the processor implement the steps of the method of the first aspect.

[0022] In a seventh aspect, a terminal is provided, which comprises a processor and a communication interface, wherein the communication interface is configured to receive a first message; the processor is configured to acquire PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determine a preamble according to the PRACH resource configuration information; and the communication interface is further configured to send a second message using the preamble on a PRACH resource associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0023] In an eighth aspect, a network side device is provided, which comprises a processor and a memory, the memory storing programs or instructions executable on the processor, which when executed by the processor implement the steps of the method of the second aspect.

[0024] In a ninth aspect, a network side device is provided, which comprises a processor and a communication interface, wherein the communication interface is configured to send a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used by the terminal to determine a preamble; and receive a second message sent by the terminal using the preamble on a PRACH resource associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0025] In a tenth aspect, a readable storage medium is provided, which stores programs or instructions, which when executed by a processor implement the steps of the method of the first aspect, or implement the steps of the method of the second aspect.

[0026] In an eleventh aspect, a wireless communication system is provided, which comprises a terminal and a network side device, the terminal being configured to perform the steps of the method of the first aspect, and the network side device being configured to perform the steps of the method of the second aspect.

[0027] In a twelfth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface and the processor are coupled, the processor is configured to run programs or instructions to implement the method in the first aspect or implement the method in the second aspect.

[0028] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement the steps of the method in the first aspect or the second aspect.

[0029] In the embodiments of the present application, the terminal receives a first message, obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information. Further, the terminal transmits a second message by using the preamble on the PRACH resource associated with the first downlink signal or the first downlink signal combination. Furthermore, the terminal can determine the PRACH resource configuration information based on the downlink signal combination, initiate the PRACH based on the downlink signal combination, and does not need to initiate multiple PRACHs based on a single downlink signal, thereby effectively reducing the terminal's overhead and energy consumption. Or, when the terminal triggers signal transmission in multiple downlink signal coverage ranges, the terminal can perform signal transmission based on the downlink signal combination, thereby no longer needing to perform multiple signal transmissions, effectively reducing the terminal's resource overhead and energy consumption, and also helping to improve the transmission rate between the terminal and the network side device. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1a is a block diagram of a wireless communication system to which embodiments of the present application can be applied;

[0031] FIG. 1b is a schematic diagram of an association relationship between an RO and an SSB in the related art;

[0032] FIG. 1c is a schematic diagram of an association relationship between an RO and an SSB in the related art;

[0033] FIG. 2 is a flowchart of a random access method according to an embodiment of the present application;

[0034] FIG. 3a is a schematic diagram of an SSB / SSB combination and PRACH resource mapping relationship according to an embodiment of the present application;

[0035] FIG. 3b is a schematic diagram of an SSB / SSB combination and PRACH resource mapping relationship according to an embodiment of the present application;

[0036] FIG. 3c is a schematic diagram of a preamble of an SSB combination configured based on a FeatureCombinationPreambles framework in an embodiment of the present application;

[0037] Figure 3d is one of the RO resource pool division schematic diagrams applicable to the embodiments of the present application;

[0038] Figure 3e is another of the RO resource pool division schematic diagrams applicable to the embodiments of the present application;

[0039] Figure 3f is a flow chart of a random access method provided by the embodiments of the present application;

[0040] Figure 3g is a flow chart of a random access method provided by the embodiments of the present application;

[0041] Figure 3h is a flow chart of a random access method provided by the embodiments of the present application;

[0042] Figure 3i is a flow chart of a random access method provided by the embodiments of the present application;

[0043] Figure 4 is a flow chart of a random access method provided by the embodiments of the present application;

[0044] Figure 5 is a structure diagram of a random access apparatus provided by the embodiments of the present application;

[0045] Figure 6 is a structure diagram of another random access apparatus provided by the embodiments of the present application;

[0046] Figure 7 is a structure diagram of a communication device provided by the embodiments of the present application;

[0047] Figure 8 is a structure diagram of a terminal provided by the embodiments of the present application;

[0048] Figure 9 is a structure diagram of a network side device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0050] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0051] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0052] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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) or 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 in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems. th

[0053] ​FIG. 1a shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a terminal-side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a notebook computer, a Personal Digital Assistant (PDA), a palm computer, a netbook, an Ultra-mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, a wearable device, a flight vehicle, a Vehicle User Equipment (VUE), a shipboard device, a Pedestrian User Equipment (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture, etc.), a game console, a Personal Computer (PC), a kiosk, or a self-service machine, etc. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, smart clothes, etc. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. The access network device can also be referred to as a Radio Access Network (RAN) device, a radio access network function, or a radio access network unit. The access network device can include a base station, a Wireless Local Area Network (WLAN) Access Point (AP), or a Wireless Fidelity (WiFi) node, etc.The base station can be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a relay station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home Node B (HNB), a home evolved Node B, a transmit / receive point (TRP), or some other suitable terminology in the art, and is not limited to a particular technical terminology, provided that the same technical effect is achieved. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0054] The core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), etc. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in the subsequent protocol version (for example, 6G), it is also within the protection scope of the present application.

[0055] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices together, and the embodiments of the present application do not make a specific limitation. It can be understood that the function modules can be network elements in a hardware device, can be software function modules running on a special hardware, or can be virtualized function modules instantiated on a platform (for example, a cloud platform).

[0056] In order to better understand the technical solutions of the present application, the related concepts that may be involved in the embodiments of the present application are explained as follows.

[0057] 1. Cell free massive MIMO network:

[0058] The cell free massive MIMO system breaks the concept of cell in the traditional massive MIMO system, and a large number of antennas are distributed on a wide area instead of being deployed at the same macro base station, and UEs are also distributed on the wide area. These antennas are called transmit-receive points (TRPs) or access points (APs), and theoretically each UE can communicate with each TRP, with the help of a front-end network and a central processing unit (CPU), a large number of geographically dispersed TRPs can jointly serve a small number of UEs, and the CPU utilizes channel statistical information for joint detection. It is expected to be applied to the next generation of indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping centers, stadiums, subways, hospitals, community centers or university campuses, etc.

[0059] 2. Cell search and synchronization process in NR technology:

[0060] In related 5G NR technology, in order to achieve downlink synchronization, the UE needs to obtain the frequency point of the access carrier by searching for a synchronization block (SS / PBCH Block, SSB). Since the frequency spectrum range of NR is very wide, in order to reduce the complexity of the search, the UE searches for the SSB according to a certain frequency interval specified by the protocol, which is called the synchronization raster. The UE detects the received power of the synchronization signal (SS Reference Signal Received Power, SS-RSRP) on the corresponding frequency point according to the synchronization raster, and selects any SSB whose SS-RSRP is higher than the threshold value rsrp-ThresholdSSB. By demodulating the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH) signal in the selected SSB, the cell selection and synchronization with the base station are completed, and then the random access is performed.

[0061] 3. Mapping rule of SSB to RO in 5G NR:

[0062] The terminal further receives the system information block (SIB) 1 by receiving the SSB, and the SIB 1 contains various parameters for initial access, PRACH resources, and SSB-RO association relationship, which are configured in the system information block SIB1. In NR, a cell can configure multiple frequency division multiplexing (FDM) physical random access channel transmission opportunities (PRACH transmission occasions, or PRACH Occasions for short, ROs) in one transmission PRACH time domain location. At one time, the number of FDM ROs can be {1, 2, 4, 8}, which is determined by the high-level parameter msg1-FDM.

[0063] The random access preamble (Preamble) can only be transmitted on the time domain resource configured by the parameter PRACHConfigurationIndex and the frequency domain resource configured by the parameter msg1-FDM. The PRACH frequency domain resource n RA ∈{0,1,…,M-1}, where M is equal to the high-level parameter msg1-FDM. When initially accessing, the PRACH frequency domain resource n RARO resources are numbered in ascending order from the lowest frequency RO resource within the initial active uplink bandwidth part, otherwise, PRACH frequency domain resource n RA RO resources are numbered in ascending order from the lowest frequency RO resource within the active uplink bandwidth part. For example, in FIG. 1b, the number of FDM ROs at one time is 8 (msg1-FDM = 8), and the RO resources are numbered in order from low to high in frequency as RO#0 ~ RO#7.

[0064] In NR, there is an association relationship between RO and the actual transmitted synchronization signal / physical broadcast channel block (SS / PBCH block, SSB). RO is associated to SSB in the order of frequency domain (from low frequency to high frequency) and then time domain. One SSB can be associated with multiple consecutive ROs, or multiple SSBs can be associated with one RO (in this case, different SSBs correspond to different preambles), and the number of SSBs associated with each RO is N, which is configured by the network through the parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, as shown in the following FIG. 1c. For example, oneEighth represents N = 1 / 8, that is, one SSB is associated with 8 consecutive ROs; eight represents N = 8, that is, 8 SSBs are associated with one RO. {n4, n8, n12, …} represents the number of preambles associated with each SSB on one RO, for example, the value n4 represents that the number of preambles associated with each SSB on one RO is 4, and n8 represents that the number of preambles associated with each SSB on one RO is 8.

[0065] The specific mapping rule of SSB and preamble index is: (1) When N < 1, one SSB is mapped to 1 / N consecutive valid ROs, and on each associated valid RO, from preamble index 0, the SSB is associated with R consecutive CB-preambles for 4-step RACH (or Type-1 random access), or CB-preambles for 2-step RACH (or Type-2 random access) respectively configured for 4-step RACH, and from preamble index R, it is associated with Q consecutive CB-preambles for 2-step RACH commonly configured with 4-step RACH. (2) When N ≥ 1, N SSBs are mapped to one valid RO, and on this valid RO, from preamble index 0, the N SSBs are associated with R consecutive CB-preambles for 4-step RACH (or Type-1 random access), or CB-preambles for 2-step RACH (or Type-2 random access) respectively configured for 4-step RACH, and from preamble index R, it is associated with Q consecutive CB-preambles for 2-step RACH commonly configured with 4-step RACH. Initially, SSBn is associated with R consecutive CB-preambles for four-step random access, or for two-step random access respectively configured with four-step random access; from Initially, SSBn is associated with Q consecutive CB-preambles for two-step random access commonly configured with four-step random access. Where 0≤n≤N-1, is determined by four-step random access parameter totalNumberOfRA-Preambles, or two-step random access parameter msgA-TotalNumberOfRA-Preambles respectively configured with four-step random access, is an integer multiple of N.

[0066] After all SSBs are associated with a round of ROs, an SSB-RO mapping cycle is formed. An SSB-to-RO association period can contain one or more SSB-RO mapping cycles. An SSB-to-RO association pattern period can contain one or more SSB-to-RO association periods, and the mapping of SSBs to ROs repeats in an association pattern period, and the association pattern period is at most 160 ms.

[0067] Generally, the base station can use different beams to transmit different SSBs, and the number of SSBs is configured by the ssb-PositionsInBurst parameter, and the maximum number of SSBs is 64 for FR2. The UE selects the RO / “RO and preamble combination” associated with the SSB with good signal according to the strength of the received downlink beam / SSB, and transmits Msg1. In this way, the network can determine the SSB selected by the UE according to the RO / “RO and preamble combination” of the received preamble. And send Msg2 on the downlink beam corresponding to the SSB to ensure the quality of the received downlink signal.

[0068] Taking Figure 1b as an example, the number of FDM ROs at one time is 8, and the actual number of transmitted SSBs is 4, i.e. SSB#0, SSB#1, SSB#2, SSB#3, each SSB is associated with 2 ROs. If the UE determines to transmit PRACH / Msg1 on the RO corresponding to SSB#0, the UE selects one of RO#0 and RO#1 to transmit PRACH.

[0069] For example, in FIG. 1c, the number of ROs of FDM at one time is 2, and the number of actually transmitted SSBs is 8, i.e., SSB#0, SSB#1, …, SSB#7, and each 2 SSBs are associated with one RO. When multiple SSBs share one RO, the preamble set associated with the multiple SSBs is different, i.e., the same preamble cannot belong to the preamble set associated with different SSBs at the same time. For example, in FIG. 1c, RO#0 has 60 preambles, in which the preambles with indexes 0-29 are associated with SSB#0, and the preambles with indexes 30-59 are associated with SSB#1.

[0070] Before the UE transmits the PRACH, the UE first selects an SSB with a RSRP higher than a threshold according to the received beam (SSB); if there are multiple SSBs with a RSRP higher than the threshold, the terminal can select any SSB with a RSRP higher than the threshold; when there is no SSB with a RSRP higher than the threshold, the UE selects an SSB based on implementation.

[0071] Based on network (NW) configuration, the UE obtains the correspondence between SSB and RO. After selecting the SSB, the RO corresponding to the selected SSB is used as the RO for transmitting the PRACH / Preamble / Msg1. If the selected SSB is associated with multiple ROs, the terminal can select one of the ROs for transmitting the PRACH / Preamble / Msg1.

[0072] 4. Feature Combination Preambles

[0073] FeatureCombinationPreambles defines a set of preambles for a specific feature, and the following features are defined in 3GPP TS 38.331 protocol: redCap-r17, smallData-r17, nsag-r17, msg3-Repetitions-r17, msg1-Repetitions-r18, eRedCap-r18, spare2, spare1. In the RRC configuration information, the field featureCombination-r17 indicates which feature or features the configured preambles are used for, and indicates the location of these special preambles (the parameter startPreambleForThisPartition-r17 indicates the starting preamble index; the parameter numberOfPreamblesPerSSB-ForThisPartition-r17 indicates the number of preambles, that is, how many preamble indexes are occupied; the parameter ssb-SharedRO-MaskIndex-r17 indicates which ROs are configured with preambles corresponding to these features).

[0074] 5. Random access procedure

[0075] In the related art, there are random access procedures containing contention and non-contention.

[0076] In the contention 4-step random access process (RACH), the UE first sends MSG1 containing a preamble to the network; after the network detects the preamble, it sends MSG2 / Random Access Response (RAR) message containing the number of preambles detected by the network and the uplink radio resource allocated to the UE to send MSG3; after the UE receives MSG2, it confirms that at least one of the preamble numbers carried in MSG2 is consistent with the preamble number it sent, and then sends MSG3 containing contention resolution information according to the resource indicated by the RAR; after the network receives MSG3, it sends MSG4 containing contention resolution information; after the UE receives MSG4, it confirms that the resolution information is consistent with the information it sent in MSG3, that is, the 4-step random access is completed.

[0077] The network includes UL grant information in the RAR for indicating MSG3 Physical Uplink Shared Channel (PUSCH) scheduling information, and includes random access preamble identification (RACH preamble ID, RAPID), temporary cell radio network temporary identifier (TC-RNTI), timing advance (TA), and the like. If the network does not receive the MSG3 PUSCH, the retransmission of the MSG3 PUSCH can be scheduled in a physical downlink control channel (PDCCH) scrambled by the TC-RNTI.

[0078] For the contention-based random access procedure, different UEs randomly select preambles for transmission, so that different UEs can select the same preamble for transmission on the same time-frequency radio resource, which can be understood as preamble collision of the UEs. In this case, different UEs can receive the same RAR, and then the different UEs can perform MSG3 PUSCH transmission according to the scheduling information in the RAR UL grant. In Rel-15 / 16 random access, repeated transmission of the MSG3 PUSCH is not supported, and the network can only decode the PUSCH (containing contention resolution information) sent by one UE on one MSG3 PUSCH scheduling resource, so the network can include the contention resolution information received in the MSG3 in the MSG4. If the contention resolution information in the MSG4 received by the UE matches the contention resolution information sent by the UE in the MSG3 PUSCH, the UE considers that the contention resolution is successful. If they do not match, it is considered that the contention resolution is unsuccessful.

[0079] If the contention resolution is unsuccessful, the UE reselects the RACH transmission resource, performs PRACH transmission, and performs the next random access attempt.

[0080] 6. PDCCH instruction triggers RACH

[0081] A PDCCH order is a technique used by a base station eNB / gNB to force a UE to trigger a RACH procedure. When the base station finds that a UE is out of synchronization in the downlink and has downlink data for the UE, it will trigger the UE to initiate RACH through the PDCCH order. In this out-of-synchronization case, the base station initiates the PDCCH order by sending a downlink control information (DCI) format format 1_0 and PRACH preamble and RACH Occasion information on the SSB beam index in which the UE resides. If the gNB finds that there is downlink data to be sent to the UE in the buffer of the medium access control (MAC) layer of the gNB, and the UE is out of synchronization due to the expiration of the time alignment timer, the gNB will trigger the PDCCH order to resynchronize with the UE.

[0082] If the gNB has downlink data for the UE to arrive, but detects that the UE is out of synchronization, it will send a PDCCH order through a DCI Format 1_0, including SSB index, ra-PreambleIndex, and PRACH Mask Index (4-step RACH) / msgA-SSB-SharedRO-MaskIndex (2-step RACH) information, to indicate a UE-specific RACH preamble. The UE initiates the RACH procedure based on the specific preamble indicated by the PDCCH order, re-completes synchronization and RRC configuration.

[0083] In the related art, when a terminal receives or detects multiple better SSB signals, for a random access procedure for multiple SSBs, the terminal can only use a repeated sending manner to send PRACH / UL-WUS multiple times on multiple random access occasion resources, causing a large terminal overhead. To this end, an embodiment of the present application provides a random access method.

[0084] It should be noted that the TRP or TRP set described in the present application can be a TRP or TRP set associated with a certain specific signal, or a TRP or TRP set associated with a certain reference signal or a certain group of reference signals. The TRP and the like can also be generalized as one or a group of repeaters / timing advance groups (TAGs) / cells (such as non-terrestrial networks (NTN), small cells) / integrated access backhaul (IAB) / beams / quasi co-location (QCL) assumptions / TCI states or other signals associated with a certain specific purpose. The TRP described in the present application can also correspond to one carrier / carrier group or one SSB / SSB group, or one BWP / BWP group, or one frequency resource / frequency resource group, or a certain transmission mode.

[0085] The SSB described in the present application can also be referred to as any module containing at least one of a synchronization signal, a broadcast signal, a physical broadcast channel (PBCH), a downlink broadcast channel of other system messages and a control channel thereof. The SSB can also be other reference signals such as CSI-RS, tracking reference signal (TRS), positioning reference signal (PRS), phase tracking reference signal (PTRS), demodulation reference signal (DMRS) and the like.

[0086] The SSB combination described in the present application can also be called SSB set or SSB group, and represents a set of SSB combinations. The SSBs contained in the SSB combination can be a type of SSB (for example, a certain specific scenario or SSBs meeting certain requirements), or multiple types of SSBs, and can only contain first-level SSBs, only contain second-level SSBs, or contain both first-level SSBs and second-level SSBs. The SSB combination described in the present application can contain SSBs of one or more TRPs.

[0087] The PRACH resource described in the present application includes RO resource, preamble resource, PRACH scrambling code sequence, PRACH sequence interleaving method resource, and the like.

[0088] The PRACH signal or preamble described in the present application can also be other uplink signals, such as WUS signals, used to trigger or request or activate the transmission of other signals.

[0089] The random access method provided by the embodiments of the present application will be described in detail below in combination with the accompanying drawings, some embodiments and application scenarios.

[0090] Please refer to FIG. 2, which is a flowchart of a random access method provided by an embodiment of the present application, and the method is applied to a terminal. As shown in FIG. 2, the method includes the following steps:

[0091] Step 201, the terminal receives a first message.

[0092] It should be noted that the first message is sent by a network side device.

[0093] Step 202, the terminal obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information.

[0094] Optionally, the first message can be a system message (for example, SIB1) associated with a downlink signal (for example, SSB), a system message of a neighboring cell, an RRC message, a downlink control information, and the like.

[0095] In the embodiments of the present application, the first message can indicate PRACH resource configuration information corresponding to the downlink signal combination, for example, the first message can indicate a mapping relationship between the downlink signal combination and the PRACH resource through configuration item information, and / or indicate a mapping relationship between the downlink signal and the PRACH resource, etc. It should be noted that the mapping relationship can be configured by the network side device or predefined by the protocol. Further, the terminal can obtain the PRACH resource configuration information corresponding to the downlink signal combination based on the first message when receiving the first message. It should be noted that the terminal obtains the PRACH resource configuration information corresponding to one or more downlink signal combinations based on the first message.

[0096] It can be understood that the PRACH resource configuration information (for example, preamble configuration and preamble-to-downlink signal association) can be configured by the current TRP or other TRP; the PRACH resource configuration information can be applicable to multiple TRPs, for example, one preamble can trigger the transmission of multiple TRP-specific downlink signals. The PRACH resource in the embodiments of the present application includes RO resource, preamble resource, PRACH scrambling code sequence, PRACH sequence interleaving manner resource, etc.

[0097] Further, the terminal determines the preamble according to the PRACH resource configuration information.

[0098] Optionally, the determining the preamble according to the PRACH resource configuration information comprises at least one of the following:

[0099] The terminal determines the preamble according to the indication of the PRACH resource configuration information;

[0100] The terminal selects the preamble in the preamble range indicated by the PRACH resource configuration information.

[0101] For example, the PRACH resource configuration information directly indicates the preamble, and the terminal determines the preamble indicated by the PRACH resource configuration information as the preamble to be used. Alternatively, the PRACH resource configuration information indicates the preamble range, and the terminal selects a suitable preamble in the indicated preamble range as the preamble to be used. It can be understood that the PRACH resource configuration information indicating the preamble and / or the preamble range can be indicated by the network side device to the terminal through the PRACH resource configuration information, so that the determination mode of the preamble in the random access process of the terminal is more flexible.

[0102] Step 203, the terminal sends a second message using the preamble on a PRACH resource associated with the first downlink signal or first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0103] Optionally, the second message includes but is not limited to Msg1 (PRACH signal), MsgA (PRACH signal + PUSCH signal), UL-WUS wake-up signal, SRS signal, or other signals containing the preamble.

[0104] Optionally, the first downlink signal or first downlink signal combination is a downlink signal or downlink signal combination whose measurement result meets a first condition.

[0105] In some embodiments,

[0106] The first downlink signal combination is a downlink signal combination composed of the N best downlink signals, N being an integer greater than 1.

[0107] The measurement result of the downlink signal in the first downlink signal combination under the first measurement metric is greater than or equal to a preset threshold.

[0108] Wherein, the measurement result can include but is not limited to RSRP, RSRQ, SINR, SNR, SIR, etc.

[0109] The first measurement metric includes but is not limited to power, channel quality, signal-to-noise ratio, interference size, etc.

[0110] For example, the first downlink signal combination includes N downlink signals, which can be the first N best in terms of measurement result under the first measurement metric, or the first N that meet a predefined measurement threshold, among all downlink signals received or detected by the terminal.

[0111] Alternatively, the measurement result of the downlink signal in the first downlink signal combination under the first measurement metric is greater than or equal to a preset threshold. In some embodiments, the first downlink signal combination can also refer to the function calculation result of the measurement result of the downlink signal in the downlink signal combination under the first measurement metric being greater than or equal to a preset threshold. Wherein, the function includes but is not limited to taking the average, taking the median (median), taking the maximum, taking the minimum, taking any value, taking the weighted average (whose weight is indicated by the network side device or predefined by the protocol), etc. The preset threshold can be specifically configured for the first downlink signal combination, or the same as the threshold of the measurement result defined for a single resource of the downlink signal (such as SSB) in the first downlink signal combination.

[0112] In the embodiments of the present application, the terminal receives a first message, obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information. Further, the terminal transmits a second message by using the preamble on the PRACH resource associated with the first downlink signal or the first downlink signal combination. Furthermore, the network side device can configure the PRACH resource configuration information of the downlink signal combination as a whole based on a plurality of downlink signals, and indicate the terminal through the first message, so that the terminal can determine the PRACH resource configuration information based on the downlink signal combination, initiate the PRACH based on the downlink signal combination, and does not need to initiate the PRACH multiple times based on a single downlink signal, thereby effectively reducing the overhead and energy consumption of the terminal, and also helping to improve the transmission performance and transmission rate between the terminal and the network side device.

[0113] Optionally, the first message includes configuration information, and the terminal obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information, including:

[0114] The terminal performs a first operation, and the first operation includes at least one of the following:

[0115] In the case where the configuration information indicates the mapping relationship between the downlink signal combination and the PRACH resource, the terminal determines a first RO resource pool based on the configuration information, and determines a first RO resource associated with the first downlink signal combination in the first RO resource pool according to a preset rule, determines a preamble corresponding to the first downlink signal combination from the first RO resource according to first information, and the first information is indicated by the first message.

[0116] In the case where the configuration information indicates the mapping relationship between the downlink signal and the PRACH resource, the terminal determines a first RO resource based on the mapping relationship between the first downlink signal and the PRACH resource, and determines a preamble associated with the first downlink signal combination on the first RO resource according to second information.

[0117] Among them, the first information and the second information are indicated by the first message.

[0118] In an embodiment, the network-side device can configure a mapping relationship between the downlink signal combination and the PRACH resource as an independent downlink signal combination (which can be considered as a virtual resource), and indicate the configuration information to the terminal through a first message. The terminal can obtain the configuration information upon receiving the first message, and determine the first RO resource pool based on the mapping relationship between the downlink signal combination and the PRACH resource indicated by the configuration information. For example, the terminal can determine the first RO resource pool as the RO resource corresponding to all downlink signal combinations according to the mapping relationship. Further, the terminal can determine the first RO resource associated with the first downlink signal combination (any one of the downlink signal combinations corresponding to the mapping relationship) from the first RO resource pool according to a preset rule, and determine the preamble corresponding to the first downlink signal combination from the first RO resource according to the first information.

[0119] It should be noted that the configuration information can be a common RACH resource configuration (similar to the RACH-ConfigCommon configuration in NR), or a related resource configuration for requesting system information (such as the SI-RequestConfig configuration in NR), and can also be other possible configuration parameters. The above examples are not a limitation on the configuration information of the present application.

[0120] Optionally, when the downlink signal and the downlink signal combination share the same RO resource pool, the preset rule includes a first rule for indicating a mapping relationship between the first signal set and the RO resource, the first signal set including the downlink signal and the downlink signal combination, and the mapping relationship between the first signal set and the RO resource being related to at least one of the following:

[0121] (1) The index of the downlink signal; for example, the RO resource can be mapped in the order from small to large according to the index of the downlink signal, or in the order from large to small, or in a certain predefined pattern or order.

[0122] (2) The identification of the downlink signal combination; for example, the RO resource can be mapped in the order from small to large according to the identification of the downlink signal combination, or in the order from large to small, or in a certain predefined pattern or order. The identification of the downlink signal combination can be the index of the downlink signal combination or the identification of the downlink signal combination pattern.

[0123] (3) the number of downlink signals included in the downlink signal combination; for example, the downlink signal combinations are mapped to RO resources according to the number of downlink signals included in the downlink signal combination in ascending order (or descending order) or according to a certain predefined mode or order.

[0124] (4) the index of the downlink signal in the downlink signal combination; for example, the downlink signal combinations are mapped to RO resources according to the index of the downlink signal in the downlink signal combination in ascending order (or descending order or a certain predefined mode or order) according to the smallest downlink signal index (or the largest downlink signal index or the sum of all downlink signal indexes) in the downlink signal combination. It should be noted that when the smallest downlink signal index (or the largest downlink signal index) of several downlink signal combinations is the same, the downlink signal combinations can be mapped according to the second smallest (or second largest) downlink signal index in the downlink signal combination, and so on.

[0125] (5) the arrangement order of the downlink signal and the downlink signal combination; for example, the downlink signal combinations and the downlink signal can be mapped to RO resources in the order of arranging the downlink signal first and then arranging the downlink signal combination, or in the order of arranging the downlink signal combination first and then arranging the downlink signal.

[0126] It should be noted that the first rule can be predefined or indicated to the terminal by the network side device, for example, the first message carries the first rule or is indicated by other indication information.

[0127] In the embodiments of the present application, the mapping relationship between the downlink signal and the downlink signal combination indicated by the first rule can be configured based on the above-mentioned multiple ways, so that the configuration of the mapping relationship is more flexible. In the case of sharing the RO resource pool by the downlink signal and the downlink signal combination, based on the first rule, the terminal can determine the RO resource associated with a certain downlink signal combination, and determine the preamble corresponding to the downlink signal combination from the RO resource associated with the downlink signal combination based on the first information, so that the terminal can initiate random access on the PRACH resource associated with the downlink signal combination, effectively saving the terminal energy consumption.

[0128] Optionally, when the network side device additionally configures a separate RO resource pool for the downlink signal combination, that is, does not share the RO resource pool with the downlink signal, the preset rule can include a second rule, the second rule is used to indicate the mapping relationship between the downlink signal combination and the RO resource, and the mapping relationship between the downlink signal combination and the RO resource is related to at least one of the following:

[0129] (1) the identity of the downlink signal combination; for example, the downlink signal combination can be mapped to the RO resource in ascending order of the identity of the downlink signal combination, or in descending order of the identity of the downlink signal combination, or in a certain predefined pattern or order. The identity of the downlink signal combination can be the index of the downlink signal combination, or the identity of the downlink signal combination pattern.

[0130] (2) the number of downlink signals included in the downlink signal combination; for example, the downlink signal combination is mapped to the RO resource in ascending (or descending) order of the number of downlink signals included in the downlink signal combination; or the downlink signal combination is mapped to the RO resource in a certain predefined pattern or order according to the number of downlink signals included in the downlink signal combination.

[0131] (3) the index of the downlink signal in the downlink signal combination. For example, the downlink signal combination is mapped to the RO resource in ascending (or descending, or a certain predefined pattern or order) order according to the smallest downlink signal index (or the largest downlink signal index, or the sum of all downlink signal indexes) in the downlink signal combination. It should be noted that when the smallest downlink signal index (or the largest downlink signal index) of several downlink signal combinations is the same, the downlink signal combination can be mapped according to the second smallest (or the second largest) downlink signal index, and so on.

[0132] It should be noted that the second rule can be predefined or indicated by the network side device to the terminal, for example, the first message carries the first rule, or is indicated by other indication information.

[0133] In the embodiments of the present application, the mapping relationship between the downlink signal combination indicated by the second rule and the RO resource can be configured based on the above-mentioned multiple ways, so that the configuration of the mapping relationship is more flexible. In the case that the network side device additionally configures an independent RO resource pool for the downlink signal combination, based on the second rule, the terminal can determine the RO resource associated with a certain downlink signal combination, and based on the first information, determine the preamble corresponding to the downlink signal combination from the RO resource associated with the downlink signal combination, so that the terminal can initiate random access on the PRACH resource associated with the downlink signal combination, effectively saving the terminal energy consumption.

[0134] Optionally, the first information includes at least one of the following:

[0135] (1) the number of downlink signal combinations;

[0136] (2) the identity of the downlink signal combination;

[0137] (3) The preamble configuration information corresponding to each of the downlink signal combinations; including the total number of preambles corresponding to the downlink signal combination At least one of the preamble quantity and / or preamble starting position (corresponding preamble index) of the random access (CBRA and / or CFRA and / or four-step RACH and / or two-step RACH and / or Group A / Group B); wherein the preamble configuration can be the same or different on different downlink signal combinations, that is, it can be configured as a common parameter shared by downlink signal combinations, or configured for each downlink signal combination;

[0138] (4) Random access type; including at least one of four-step RACH (i.e. Type-1 RACH), two-step RACH (i.e. Type-2 RACH), CBRA, and CFRA;

[0139] (5) The function of the preamble; for example, the preamble is used for system message request (System Information (SI) request), including for requesting SIB information, or master information request (Master Information (MI) request), including for requesting MIB information; or for wake-up, including preamble signals for WUS, which are sent by the terminal to wake up the specific behavior of the network side.

[0140] For the terminal to obtain the PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determine the preamble according to the PRACH resource configuration information, in another embodiment, the downlink signal combination does not configure a separate mapping relationship between the downlink signal combination and the PRACH resource, that is, the network side device only configures the mapping relationship between the downlink signal and the PRACH resource, and the network side device indicates the configuration information indicating the mapping relationship to the terminal through the first message. Define a certain downlink signal combination as a first downlink signal combination, which includes a first downlink signal in the first downlink signal combination. The terminal can obtain the above configuration information upon receiving the first message, determine the RO resource associated with the first downlink signal based on the mapping relationship between the first downlink signal and the PRACH resource indicated by the configuration information, and further determine the preamble corresponding to the first downlink signal combination on the RO resource according to the second information.

[0141] Optionally, the second information includes at least one of the following:

[0142] (1) The identifier of the first downlink signal combination;

[0143] (2) the downlink signals included in the first downlink signal combination, i.e., which downlink signals are included in the first downlink signal combination;

[0144] (3) preamble configuration information corresponding to the first downlink signal combination; the preamble configuration includes at least one of the following: preamble starting position, preamble quantity, preamble index, and position of the last preamble. The preamble starting position is the preamble starting position corresponding to the first downlink signal combination (for example, which can be determined according to the corresponding preamble index); the preamble quantity is the total number of preambles in the first downlink signal combination, including preambles for CBRA / for CFRA / for two-step RACH / for four-step RACH / Group A / Group B; the position of the last preamble can be determined according to the preamble index. It should be noted that the preamble configuration can be the same or different on different downlink signal combinations, i.e., it can be configured as a common parameter shared by downlink signal combinations or configured for each downlink signal combination;

[0145] (4) the number of all downlink signal combinations containing the first downlink signal;

[0146] (5) the identification of all downlink signal combinations containing the first downlink signal; it should be noted that the identification of all downlink signal combinations, i.e., the identification of each downlink signal combination containing the first downlink signal, i.e., there are multiple identifications, rather than a specific identification corresponding to all downlink signal combinations;

[0147] (6) preamble mapping order of all downlink signal combinations containing the first downlink signal on the first RO resource;

[0148] (7) preamble configuration information corresponding to all downlink signal combinations containing the first downlink signal; the preamble configuration information can be referred to in the foregoing description and will not be described here;

[0149] (8) random access type; including at least one of four-step RACH (Type-1 RACH), two-step RACH (Type-2 RACH), CBRA, and CFRA;

[0150] (9) function of the preamble; the function of the preamble can be referred to in the foregoing description and will not be described here.

[0151] Optionally, the preamble mapping order is related to at least one of the following:

[0152] (1) the identity of the downlink signal combination containing the first downlink signal; for example, the identity of the downlink signal combination containing the first downlink signal can be mapped to the RO resource in ascending order, or in descending order, or in a certain predefined pattern or order. Wherein, the identity of the downlink signal combination can be the index of the downlink signal combination, or the downlink signal combination mode identity.

[0153] (2) the number of downlink signals contained in the downlink signal combination containing the first downlink signal; for example, all downlink signal combinations containing the first downlink signal are mapped to the RO resource according to the number of downlink signals contained in each downlink signal combination in ascending (or descending) order; or the number of downlink signals contained in the downlink signal combination is mapped to the RO resource in a certain predefined pattern or order.

[0154] (3) the index of the downlink signal in the downlink signal combination containing the first downlink signal; for example, all downlink signal combinations containing the first downlink signal are mapped to the RO resource according to the smallest downlink signal index (or the largest downlink signal index, or the sum of all downlink signal indexes) in the downlink signal combination in ascending (or descending, or a certain predefined pattern or order) order. It should be noted that when the smallest downlink signal index (or the largest downlink signal index) of several downlink signal combinations is the same, the downlink signal combinations can be mapped according to the order of the second smallest (or the second largest) downlink signal index in the downlink signal combination, and so on.

[0155] In the embodiments of the present application, in the case where no separate downlink signal combination and PRACH resource mapping relationship is configured for the downlink signal combination, i.e., only the mapping relationship between the downlink signal and the PRACH resource is configured, the downlink signal combination is associated with part of the preambles on the PRACH resource (such as the RO resource) to which the downlink signal contained in the downlink signal combination is mapped, and thus the preamble associated with the downlink signal combination is determined, which helps the terminal to quickly determine the preamble, and thus the terminal can initiate random access on the PRACH resource associated with the downlink signal based on the preamble.

[0156] Optionally, in the case where the downlink signal combination is a feature (based on, for example, the FeatureCombinationPreambles framework in NR to configure the preamble resource corresponding to each downlink signal (SSB) combination), the second information includes at least one of the following:

[0157] an identity of the first downlink signal combination;

[0158] an identity of the first downlink signal combination;

[0159] downlink signals included in the first downlink signal combination;

[0160] preamble configuration information corresponding to the first downlink signal combination;

[0161] an index of an RO mask corresponding to the first downlink signal combination, i.e., indicating distribution of preambles on ROs; used to indicate which RO(s) is / are deployed with preambles corresponding to the first combination; for example, an ssb-SharedRO-MaskIndex parameter similar to NR is configured in a feature combination configuration (FeatureCombinationPreambles similar to NR) field to indicate which RO(s) is / are deployed with preambles corresponding to the first combination.

[0162] It should be noted that the identity of the first downlink signal combination, the downlink signals included in the first downlink signal combination, and the preamble configuration corresponding to the first downlink signal combination can be referred to the foregoing description and will not be described here.

[0163] In the embodiments of the present application, the content of the second information is defined when the downlink signal combination is used as a feature, so that the terminal determines the RO resource corresponding to the first downlink signal in the first downlink signal combination according to the mapping relationship between the downlink signal and the PRACH resource indicated by the configuration information, and determines the preamble associated with the first downlink signal combination on the first RO resource according to the second information, which defines the way for the terminal to determine the preamble associated with the downlink signal combination when the downlink signal combination is used as a feature, and helps the terminal to quickly determine the preamble.

[0164] Optionally, in the case where the configuration information indicated by the first message includes a PRACH resource identity and the PRACH resource identity is a specific identity, the terminal performs the first operation described above, and the specific implementation of the first operation can be referred to the foregoing description and will not be described here.

[0165] It should be noted that the PRACH resource identifier includes but is not limited to a numerical value (for example, an index), a letter, a picture, and the like. Illustratively, in the case of the PRACH resource identifier being a numerical value, the specific identifier can be 0. Alternatively, in the case that the terminal determines the downlink signal combination and the corresponding PRACH resource configuration information based on the configuration information in the first message, the configuration information includes at least one of the following: a downlink signal combination identifier, a downlink signal identifier in the downlink signal combination, a PRACH resource identifier, and a PRACH mask index (MaskIndex).

[0166] In the embodiments of the present application, the network side device can configure the correspondence between the downlink signal combination and the PRACH resource, and indicate the configuration information to the terminal through the first message, so that the terminal can determine the PRACH resource corresponding to the downlink signal combination based on the configuration information.

[0167] In some embodiments, the configuration information can be a dedicated RACH configuration (similar to the RACH-ConfigDedicated configuration of NR), which can be indicated by the network side device through a system message or an RRC message (i.e., the first message).

[0168] For example, based on the NR framework, the terminal obtains the downlink signal combination and the corresponding PRACH preamble resource in the downlink signal resource configuration (similar to the ssb-ResourceList of the RACH-ConfigDedicated configuration of NR); for example, the SSB combination and the corresponding preamble resource (PRACH resource identifier, such as the ra-PreambleIndex parameter of NR) are included in the SSB resource configuration (similar to the ssb-ResourceList of NR).

[0169] In some embodiments, the configuration information can be a configuration for a beam (beam) failure recovery scenario, such as the BeamFailureRecoveryConfig configuration, which can be indicated by the network side device through an RRC message or a downlink control information (i.e., the first message).

[0170] For example, based on the NR framework, the terminal obtains the downlink signal combination associated RO-preamble resource in the PRACH-ResourceDedicatedBFR of the BeamFailureRecoveryConfig; for example, the mapping relationship between the downlink signal combination and the RO-preamble resource (PRACH resource identifier, such as the ra-PreambleIndex parameter of NR) is included in the PRACH-ResourceDedicatedBFR.

[0171] In some embodiments, the configuration information can also be a PDCCH order (such as a PDCCH order triggered in NR), which can be indicated by the network side device through a downlink control information (i.e., the first message); the terminal determines the PRACH resource and the corresponding SSB combination by receiving the configuration information, and sends a PRACH signal (Msg1 / MsgA).

[0172] Optionally, in the case where the RACH resource identifier is a numerical value, the PRACH resource identifier is an integer greater than or equal to 0, and the integer is less than the sum of the number of downlink signals and the number of downlink signal combinations.

[0173] In the case where the PRACH resource identifier is 0, the terminal selects a preamble resource for CBRA, i.e., the terminal performs the first operation described above, which will not be repeated here.

[0174] Optionally, in the case where the PRACH resource identifier is not a specific identifier (for example, the PRACH resource identifier is a numerical value greater than 0), the terminal selects the preamble resource corresponding to the PRACH resource identifier according to the configuration information. For example, for a PDCCH order-triggered RACH scenario (of course, other communication scenarios are also possible, which will not be listed here), if the PRACH resource identifier is greater than 0, the terminal selects the CFRA preamble resource corresponding to the PRACH resource identifier.

[0175] Optionally, the PRACH resource identifier can be a binary sequence greater than 6 bits, where 0-63 represents the preamble index corresponding to the downlink signal, and the PRACH resource identifier greater than 63 represents the preamble index corresponding to the downlink signal combination.

[0176] In the embodiments of the present application, after the terminal sends the second message, the method further comprises:

[0177] The terminal receives a third message sent by the network side device, and the third message is a response message of the second message.

[0178] Optionally, the third message is, for example, Msg2, MsgB, SIB information, MIB information, PBCH, RRC configuration information, a first reference signal (for example, SSB, which can refer to on-demand SSB, second-level SSB, etc.; or reference signals such as CSI-RS, TRS, DMRS, PRS, and PTRS).

[0179] Exemplarily, when the preamble in the second message is associated to a certain downlink signal combination as UL-WUS, the third message is a first reference signal, then:

[0180] When the first reference signal is SSB, the network side device sends all the SSBs in the SSB combination associated with the preamble;

[0181] When the first reference signal is other reference signal (such as CSI-RS) quasi co-located with SSB, the network side sends all the reference signals quasi co-located with any SSB in the SSB combination associated with the preamble;

[0182] Wherein, when the first reference signal is on-demand SSB, the UE can obtain the resource configuration information from the system message (i.e. the first message) of the neighboring cell, and then obtain the mapping relationship between the SSB and the RO-preamble resource.

[0183] For another example, when the third message is not the reference signal associated with the second message, such as Msg2, the third message sends all the reference signals (such as DMRS) quasi co-located with the reference signal associated with the second message.

[0184] In the embodiments of the present application, based on the PRACH resource configuration information of the downlink signal combination, the terminal can initiate PRACH based on the downlink signal combination composed of multiple downlink signals, and the network side device can adjust the downlink signal transmission direction according to the RO-preamble information, and better align the direction of the terminal; in addition, the network side device can determine the cooperative TRP cluster (such as one downlink signal or downlink signal combination corresponding to each TRP) serving the terminal according to the RO-preamble information, and start MTRP joint transmission from Msg2 / MsgB, thereby improving the transmission rate and reliability. In addition, the UL-WUS based on multiple SSBs can trigger the transmission of on-demand SSB / SIB / CSI-RS signals or on-demand SIB / MIB messages by one-time transmission, without using the repetition mode, thereby reducing the resource overhead and implementation complexity of the terminal.

[0185] In order to better understand the technical solutions of the present application, the technical solutions of the present application are explained and described below through several specific embodiments.

[0186] For example, in some embodiments:

[0187] In the first configuration, a parameter ssb-combinationPatternNumber is defined, which represents the total number of SSB combination patterns.

[0188] If N≥1, on each valid RO resource, the preamble resource associated with the nth(0≤n≤N-1) SSB or SSB combination starts from , where indicated by the two-step RACH parameter msgA-TotalNumberOfRA-Preambles, respectively, is an integer multiple of N.

[0189] Further, a parameter perPattern-CB-PreamblesPerSSB can be defined, which represents the number of CB-preambles corresponding to each SSB combination pattern. The perPattern-CB-PreamblesPerSSB parameter can be defaulted to the same parameter as defined in the ssb-perRACH-OccasionAndCB-PreamblesPerSSB parameter, or indicate a separate value, or indicate a vector, where each value in the vector represents the number of CB-preambles corresponding to each SSB combination pattern, respectively.

[0190] Further, for SSB combinations, the number of CB-preambles for four-step RACH and two-step RACH can be indicated separately.

[0191] For example, set the parameter totalNumberOfRA-Preambles = 64, ssb-perRACH-Occasion = N = 4, ssb-Number = 3, ssb-combinationPatternNumber = 2. As shown in FIG. 3a, the nthSSB or SSB combination starts from the sequence number The start (i.e. n = 0, 1, 2, 3, starting from preamble index 0, 16, 32, 48 respectively) includes 16 preambles, starting from the preamble index 0 of the first valid RO, in order from front to back, SSB1-preamble, SSB2-preamble, SSB3-preamble, SSB combination pattern1-preamble, SSB combination pattern2-preamble cycle, for example, as shown in the figure, RO#0 is associated with {SSB#0, SSB#1, SSB#2, SSB combination pattern#1}, RO#1 is associated with {SSB combination pattern#2, SSB#0, SSB#1, SSB#2}, RO#2 is associated with {SSB combination pattern#1, SSB combination pattern#2, SSB#0, SSB#1}.

[0192] In addition, in the first configuration (for example, SI-RequestConfig), preamble resource parameters for SI-request, MI-request, WUS based on SSB combination can be indicated, including at least one of the following:

[0193] (1) The first index is used to indicate the preamble index of the preamble start for SI-request, MI-request, WUS, for example, the parameter ra-PreambleStartIndex;

[0194] Define N SSBs or SSB combinations associated with one RO resource, when N ≥ 1, for the i-th SSB or SSB combination (i = 0, …, N-1), the preamble with preamble index = ra-PreambleStartIndex+i is used for SI request, and for N <1, the preamble with preamble index = ra-PreambleStartIndex is used for SI request;

[0195] (2) The first time resource is used to indicate the time resource for sending SI-request, MI-request, WUS to request the network to send system information (System Information Block, SIB), master information block (Master Information Block, MIB), downlink reference signal, for example, the parameter ra-AssociationPeriodIndex;

[0196] (3) A first indication information, used to indicate the RO resource for sending SI-request, MI-request, WUS, for example, the parameter ra-ssb-OccasionMaskIndex.

[0197] The terminal sends the preamble sequence indicated by the first sequence number on the RO resource indicated by the first indication information in the time indicated by the first time resource based on the first configuration information associated with the first SSB combination, to trigger the network to send the system information (SIB or MIB information) associated with the first SSB combination in the range of the first SSB combination, or to trigger the network to send all SSBs contained in the first SSB combination.

[0198] After receiving the preamble sequence, the network side sends the system information (SIB or MIB information) associated with the first SSB combination according to the association relationship between the preamble index and the SSB combination, or triggers the network to send all SSBs contained in the first SSB combination.

[0199] In the embodiment, in the case that the SSB (i.e. the downlink signal) shares the RO resource pool with the SSB combination (i.e. the downlink signal combination) and the network side configures the mapping relationship between the SSB combination and the PRACH resource, the terminal can determine the PRACH resource associated with the first SSB combination based on the mapping relationship, and initiate random access based on the first SSB combination, so as to avoid initiating multiple PRACHs based on a single downlink signal, effectively reducing the terminal's overhead and energy consumption.

[0200] Alternatively, in some embodiments:

[0201] (1) In the first configuration, the parameter perPattern-CB-PreamblesPerSSB is defined to represent the number of CB-preambles corresponding to each SSB combination pattern. The perPattern-CB-PreamblesPerSSB parameter can be defaulted to the same parameter as the number of CB-preambles defined in the ssb-perRACH-OccasionAndCB-PreamblesPerSSB parameter, or indicate a separate numerical value, or indicate a vector, each numerical value in the vector representing the number of CB-preambles corresponding to each SSB combination pattern in turn; further, for the SSB combination, the number of CB-preambles for four-step RACH and two-step RACH can be indicated respectively.

[0202] On each valid RO where SSBn is mapped, the CB-preamble number is determined by ssb-perRACH-OccasionAndCB-PreamblesPerSSB parameter, for SSB combination pattern associated with SSBn (i.e. SSB combination contains SSB n, for example SSB combination pattern is SSB n+SSB m), the preambles are mapped in order from front to back according to default rule, which includes at least one of the following: SSB combination pattern index from small to large, SSB number of SSB combination from small to large, (minimum) SSB index of SSB combination from small to large, sum of SSB index of SSB combination from small to large.

[0203] On valid RO associated with SSB, the preamble mapping position of SSB and SSB combination is shown in Figure 3b, there are two configuration options:

[0204] Opt1 (Option one): In the CB-preamble range of each SSB, SSB preamble, preamble of SSB combination (order as above) are sequentially arranged from front to back;

[0205] Opt2 (Option two): In the CB-preamble range of each SSB, In the CB-preamble range of each SSB, after the CB-preamble range originally defined by SSB, preamble of SSB combination (order as above) are sequentially arranged from front to back.

[0206] For example, as shown in Figure 1b, the CB-preamble number associated with SSB is defined as 40, and the CB-preamble number associated with each SSB combination group is perPattern-CB-PreamblesPerSSB=10, then on valid RO#0 associated with SSB#0:

[0207] ① In the case of configuration Opt1, the CB-preamble range of SSB#0 is preamble index 0~19, the CB-preamble range of SSB combination pattern1 is preamble index 20~29, and the CB-preamble range of SSB combination pattern2 is preamble index 30~39.

[0208] In the case of Opt2, the CB-preamble range of SSB#0 is preamble index 0~39, the CB-preamble range of SSB combination pattern1 is preamble index 40~49, and the CB-preamble range of SSB combination pattern2 is preamble index 50~59.

[0209] (2) Alternatively, in the first configuration, the starting preamble index (or the starting preamble index and the number of corresponding CB-preambles) of the CB-preambles corresponding to each SSB combination pattern is indicated, and the CB-preamble range corresponding to each SSB combination pattern i is from the starting preamble index of the pattern i to the starting preamble index of the next SSB or SSB combination-1.

[0210] In this embodiment, in the case that the SSB and the SSB combination share the RO resource pool and the network side does not additionally configure separate PRACH resources for the SSB combination, the terminal determines the PRACH resource associated with the first SSB combination (including the first SSB) according to the mapping relationship between the first SSB and the PRACH resource, initiates random access based on the first SSB combination, and does not need to initiate multiple PRACHs, thereby effectively reducing the terminal's overhead and energy consumption.

[0211] Alternatively, in some embodiments:

[0212] The terminal receives the SIB, acquires the RACH-ConfigCommon configuration, determines that the feature type in the FeatureCombinationPreambles field is SSB combination (featureCombination = ssbCombination), and acquires the pattern / constitution (ssbCombinationPattern) of the SSB combination, for example, the combination of SSB#0+SSB#1.

[0213] Further, the terminal acquires the preamble configuration parameters of the SSB combination, including the starting preamble index (startPreambleForThisPartition), the number of preambles (nrofPreambleForThisPartition), the distribution on the RO (ssb-SharedRO-MaskIndex), and determines the corresponding preamble range.

[0214] For example, the parameter assignment is as follows:

[0215] featureCombination = ssbCombination;

[0216] ssbCombinationPattern = {0, 1};

[0217] startPreambleForThisPartition = 12;

[0218] nrofPreambleForThisPartition = 10;

[0219] ssb-SharedRO-MaskIndex = RO1 Only;

[0220] totalNumberOfRA-Preambles = 60;

[0221] ssb-perRACH-OccasionAndCB-PreamblesPerSSB = two + n12.

[0222] Then, as shown in FIG. 3c, the preamble range of the SSB combination pattern of SSB#0 + SSB#1 is shown in the area where SSB combination pattern 1 is located in FIG. 3c, and the preamble index 12~21 and the preamble index 42~51 configured on RO#1.

[0223] In this embodiment, the SSB combination corresponding PRACH resource is newly defined based on the function combination preamble framework, and the terminal can determine the preamble and other information according to the configured SSB combination corresponding PRACH resource, which helps the terminal to initiate the random access process based on the SSB combination.

[0224] Alternatively, in some embodiments:

[0225] The network indicates a set of PRACH configurations, wherein the RO resource pool of the SSB and the SSB combination is distinguished in at least one of the following ways: FDM, TDM, RO group.

[0226] FDM mode: as shown in FIG. 3d, for example, the SSB (i.e. single SSB indicated in the figure) and the SSB combination (i.e. SSB combination indicated in the figure) are allocated RO resources in the frequency domain according to the ratio of 3:1, then the RO resource pool of the SSB combination is {RO#3, RO#7, RO#11}.

[0227] TDM manner: as shown in FIG. 3d, for example, SSB (i.e., single SSB indicated in the figure) and SSB combination (i.e., SSB combination indicated in the figure) are allocated RO resources in the time domain in a ratio of 2:1, and the RO resource pool of the SSB combination is {RO#8, RO#9, RO#10, RO#11}.

[0228] Further, in the RO resource pool of the SSB combination, the mapping of the SSB combination and the RO resource is performed according to the second rule.

[0229] RO group manner: as shown in FIG. 3e, for example, the RO resource pool of SSB (i.e., single SSB indicated in the figure) corresponds to RO group#1, and the RO resource pool of SSB combination (i.e., SSB combination indicated in the figure) corresponds to RO group#2, and the RO resource pool of the SSB combination is {RO#1-0, RO#1-1, RO#1-2, RO#1-3, RO#1-4, RO#1-5}.

[0230] In each RO group, the RO resource identifier can be arranged in the order of time domain from small to large and frequency domain from low to high (as shown in FIG. 3e); or, first arranged in the order of frequency domain from low to high, and then arranged in the order of time domain from small to large.

[0231] Further, in the RO resource pool of the SSB combination, the mapping of the SSB combination and the RO resource is performed according to the second rule.

[0232] In this embodiment, the network side can configure a separate RO resource pool for the SSB combination. In the case that the network side indicates a set of PRACH configurations, the terminal adopts which manner to distinguish the RO resource pool of the SSB and the SSB combination, so as to guarantee that the terminal can accurately determine the RO resource corresponding to the SSB combination.

[0233] Alternatively, in some embodiments:

[0234] (1) The terminal obtains the ssb-perRACHOccasion parameter in the RACH-ConfigDedicated configuration, that is, the parameter N. When N < 1, one SSB or SSB combination is mapped to 1 / N RO resources; when N ≥ 1, the continuous N SSBs or SSB combinations are associated with one RO resource. The RO resource can also be referred to as PRACH occasion (PRACH Occasion) or RACH occasion.

[0235] For example, set the parameter totalNumberOfRA-Preambles = 64, ssb-perRACH-Occasion = N = 4, ssb-Number = 3, ssb-combinationPatternNumber = 2. For example, {RO#1, RO#2, RO#3} is the RO resource pool (i.e. resource set) for CFRA, then RO#1 is associated with {SSB#0, SSB#1, SSB#2, SSB combination pattern#1}, RO#2 is associated with {SSB combination pattern#2, SSB#0, SSB#1, SSB#2}, and RO#3 is associated with {SSB combination pattern#1, SSB combination pattern#2, SSB#0, SSB#1}.

[0236] (2) The terminal obtains the CFRA-SSB-Resource parameter in the RACH-ConfigDedicated configuration, which is used to indicate the SSB combination pattern and the preamble resource (i.e. ra-PreambleIndex) associated with the SSB combination, wherein the range of the ra-PreambleIndex is 0 to N_max, and N_max is the maximum SSB number + SSB combination number - 1.

[0237] In this embodiment, when the SSB and the SSB combination are associated with the same RO resource pool, how does the terminal determine the RO resource corresponding to the SSB combination to ensure that the terminal can initiate random access based on the SSB combination on the corresponding RO resource, effectively saving the terminal energy consumption and overhead.

[0238] Alternatively, in some embodiments:

[0239] Please refer to FIG. 3f:

[0240] Step 1: The network side device sends a first message (i.e. PDCCH order DCI 1_0) to the UE;

[0241] Step 2: The terminal receives the first message from the network side, obtains the fourth information based on the first message, and sends Msg1 according to the fourth information to initiate the CFRA or CBRA random access process.

[0242] Specifically, the UE obtains the SSB index or SSB combination pattern and the PRACH resource identifier ra-PreambleIndex from the first message;

[0243] If ra-PreambleIndex > 0, the UE transmits the preamble (i.e. Msg1) using the preamble index indicated by ra-PreambleIndex to initiate CFRA random access procedure;

[0244] Or, if ra-PreambleIndex = 0, the UE transmits the preamble (i.e. Msg1) using the preamble index of CBRA to initiate CBRA random access procedure.

[0245] Wherein, if the fourth information indicates SSB combination pattern, the UE transmits Msg1 according to the protocol predefined manner, including at least one of the following:

[0246] Manner one: transmitting Msg1 repetition based on all SSB directions in SSB combination pattern;

[0247] Manner two: transmitting Msg1 based on the predefined direction of SSB combination pattern.

[0248] Step 3: the terminal receives the Msg2 feedback by the network side;

[0249] Step 4: the terminal receives the RRC reconfiguration message sent by the network side, and performs RRC reconfiguration according to the message.

[0250] In this embodiment, the terminal can select the corresponding random access mode according to whether the PRACH resource identifier indicated in the first message is 0, so that the terminal can initiate PRACH in different ways, making the random access mode of the terminal more flexible.

[0251] Or, in some embodiments:

[0252] The terminal receives the first message, and transmits the preamble based on SSB combination (i.e. the second message) as UL-WUS signal to trigger the transmission of on-demand SSB / SIB / CSI-RS signals or on-demand SIB / MIB messages.

[0253] For example, please refer to FIG. 3g:

[0254] Step 1: the network side device transmits synchronization signal (such as PSS, SSS signal) not containing PBCH to UE;

[0255] Step 2: the terminal transmits the preamble of the first SSB combination based on the preconfigured preamble information;

[0256] Step 3: The network side device receives the preamble of the first SSB combination from the terminal, and sends broadcast information (PBCH information) or MIB system information associated with the first SSB combination.

[0257] In this embodiment, the terminal can trigger on-demand MIB or PBCH message sending based on the WUS signal of the SSB combination, avoid multiple signal sending, and effectively save terminal resource overhead and energy consumption.

[0258] For another example, please refer to FIG. 3h:

[0259] Step 1: The network side device sends system information (MIB or common SIB information) to the UE.

[0260] Step 2: The terminal sends the preamble of the first SSB combination based on the configured preamble information.

[0261] Step 3: The network side device receives the preamble of the first SSB combination from the terminal, and sends Specific on-demand SIB system information associated with the first SSB combination, such as XDD duplex configuration, DTX-DRX configuration, etc. associated with the first SSB combination.

[0262] In this embodiment, the terminal can trigger the network side to send the Specific on-demand SIB associated with the SSB combination based on the WUS signal of the SSB combination, and effectively improve the transmission performance between the terminal and the network side.

[0263] For another example, please refer to FIG. 3i:

[0264] Step 1: The network side device of the neighboring area or other network side device sends a first message (such as SIB system information) to the UE.

[0265] Step 2: The terminal sends the preamble of the first SSB combination of the cell to the network side device of the cell based on the SSB and RO-preamble configuration information of the cell notified by the network side device of the neighboring area.

[0266] Step 3: The network side device of the cell receives the preamble of the first SSB combination from the terminal, and sends the first downlink signal (such as on-demand SSB) associated with the first SSB combination.

[0267] For example, in the NTN scenario, the satellite SSB is a periodically transmitted SSB, and the SSB of the ground cell is an on-demand transmitted SSB. The first message can be sent by the satellite device to the UE, informing the UE of the SSB and RO-preamble configuration information of all ground cells in the satellite coverage range. When the UE needs to access a ground cell, a preamble corresponding to an SSB combination composed of all SSBs of the cell is sent to trigger the SSB transmission of the cell, and then the cell is accessed.

[0268] In addition, the UE can also trigger the specific downlink signal transmission (on-demand SIB1 / SSB, etc.) of the multiple TRPs / network side devices by sending a WUS signal (for example, a preamble).

[0269] In this embodiment, the terminal can trigger the network side to send the downlink signal associated with the SSB combination based on the WUS signal of the SSB combination, without multiple transmissions for a single SSB, effectively improving the transmission performance between the terminal and the network side.

[0270] Please refer to FIG. 4, which is a flowchart of a random access method provided by an embodiment of the present application, the method being applied to a network side device. As shown in FIG. 4, the method comprises the following steps:

[0271] Step 401: The network side device sends a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used to determine a preamble.

[0272] Step 402: The network side device receives a second message sent by the terminal using the preamble on the PRACH resource associated with the first downlink signal or the first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0273] Optionally, the first message further comprises configuration information, the configuration information being used to indicate at least one of the following:

[0274] A mapping relationship between the downlink signal and the PRACH resource;

[0275] A mapping relationship between the downlink signal combination and the PRACH resource;

[0276] A PRACH resource identifier.

[0277] Optionally, in the case where the configuration information is used to indicate the mapping relationship between the downlink signal combination and the PRACH resource, the first message further comprises first information, the first information being used to determine the preamble corresponding to the first downlink signal combination.

[0278] The first information comprises at least one of:

[0279] The number of the downlink signal combinations;

[0280] The identifier of the downlink signal combination;

[0281] The preamble configuration corresponding to the downlink signal combination;

[0282] The random access type;

[0283] The function of the preamble.

[0284] Optionally, the network-side device indicates a preset rule to the terminal, and the preset rule is used for the first RO resource pool to determine the first RO resource associated with the first downlink signal combination, and the first RO resource is an RO resource associated with the first downlink signal combination.

[0285] Optionally, the preset rule comprises a first rule, and the first rule is used for indicating a mapping relationship between a first signal set and an RO resource, the first signal set comprises a downlink signal and a downlink signal combination, and the mapping relationship between the first signal set and the RO resource is related to at least one of:

[0286] The index of the downlink signal;

[0287] The identifier of the downlink signal combination;

[0288] The number of downlink signals in the downlink signal combination;

[0289] The index of the downlink signal in the downlink signal combination;

[0290] The arrangement order of the downlink signal and the downlink signal combination.

[0291] Optionally, the preset rule comprises a second rule, and the second rule is used for indicating a mapping relationship between a downlink signal combination and an RO resource, and the mapping relationship between the downlink signal combination and the RO resource is related to at least one of:

[0292] The identifier of the downlink signal combination;

[0293] The number of downlink signals in the downlink signal combination;

[0294] The index of the downlink signal in the downlink signal combination.

[0295] Optionally, in the case that the configuration information is used to indicate the mapping relationship between the downlink signals and the PRACH resources, the first message further comprises second information, the second information being used to determine the preamble associated with the first downlink signal combination on the first RO resource, the first RO resource being the RO resource determined based on the mapping relationship between the first downlink signal and the PRACH resource;

[0296] The second information comprises at least one of the following:

[0297] An identifier of the first downlink signal combination;

[0298] A downlink signal comprised in the first downlink signal combination;

[0299] Preamble configuration information corresponding to the first downlink signal combination;

[0300] A number of all downlink signal combinations containing the first downlink signal;

[0301] Identifiers of all downlink signal combinations containing the first downlink signal;

[0302] Preamble mapping orders of all downlink signal combinations containing the first downlink signal on the first RO resource;

[0303] Preamble configuration information corresponding to all downlink signal combinations containing the first downlink signal;

[0304] A random access type;

[0305] A function of the preamble;

[0306] Or, in the case that the downlink signal combination is a feature, the second information comprises at least one of the following:

[0307] An identifier of the feature of the downlink signal combination;

[0308] An identifier of the first downlink signal combination;

[0309] A downlink signal comprised in the first downlink signal combination;

[0310] Preamble configuration information corresponding to the first downlink signal combination;

[0311] An index of an RO mask corresponding to the first downlink signal combination.

[0312] Optionally, the preamble configuration information comprises at least one of the following:

[0313] A starting position of the preamble;

[0314] A preamble index;

[0315] Number of preambles.

[0316] Optionally, the preamble mapping order is related to at least one of the following:

[0317] An identifier for a downlink signal combination that includes the first downlink signal;

[0318] The number of downlink signals included in the downlink signal combination that includes the first downlink signal;

[0319] An index containing the downlink signal combination of the first downlink signal.

[0320] Optionally, if the configuration information includes the mapping relationship between the downlink signal and PRACH resources, the configuration information further includes at least one of the following:

[0321] Downlink signal combination identifier, downlink signal identifier in downlink signal combination, PRACH resource identifier, and PRACH mask index.

[0322] Optionally, when the PRACH resource identifier is a numerical value, the PRACH resource identifier is an integer greater than or equal to 0, and the integer is less than the sum of the number of downlink signals and the number of downlink signal combinations.

[0323] Optionally, the method further includes:

[0324] The network-side device sends a third message to the terminal, which is a response message to the second message.

[0325] It should be noted that the random access method provided in this application embodiment is applied to network-side devices, and is in contrast to the random access method applied to the terminal side described above. The relevant concepts and specific implementation processes involved in this application embodiment can be referred to the description in the above terminal-side method embodiment, and will not be repeated here.

[0326] In this embodiment, the network-side device can treat a combination of multiple downlink signals as a whole to configure the PRACH resource configuration information of the downlink signal combination and instruct the terminal through a first message. Thus, the terminal can determine the PRACH resource configuration information based on the downlink signal combination and initiate PRACH based on the downlink signal combination, without having to initiate multiple PRACH based on a single downlink signal. The network-side device also does not need to perform multiple signal receptions. Alternatively, when the terminal triggers signal transmission within the coverage area of ​​multiple downlink signals, the terminal does not need to perform multiple signal transmissions, and the network-side device does not need to perform multiple signal receptions. This can effectively reduce the overhead and energy consumption of the network-side device and also help improve the transmission rate between the terminal and the network-side device.

[0327] The random access method provided in the embodiments of the present application can be executed by a random access device. The embodiments of the present application take the random access device as an example to illustrate the random access device provided in the embodiments of the present application.

[0328] The embodiments of the present application provide a random access device. As an example, the random access device can be a communication device or a component in the communication device, such as a chip. The communication device can be a terminal, a network side device, a server or the like. For example, the terminal can include but is not limited to the types of the terminal 11 listed above, the network side device can include but is not limited to the types of the network side device 12 listed above, and the embodiments of the present application do not make specific limitations.

[0329] The random access device includes a receiving module, a sending module and a processing module. The receiving module, the sending module and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. For example, the processor can include a general purpose processor, a special purpose processor, a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor

[0330] (Network Processor, NP), a field programmable gate array (FPGA) or other programmable logic devices, a gate circuit, a transistor, a discrete hardware component, etc. The receiving module and the sending module can be implemented by a communication interface, which can include one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, etc.

[0331] Specifically, referring to FIG. 5, when the random access device is a terminal or a component in the terminal, the random access device 500 includes:

[0332] The first receiving module 501 is configured to receive a first message.

[0333] The processing module 502 is configured to acquire PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determine a preamble according to the PRACH resource configuration information.

[0334] The first sending module 503 is configured to send a second message by using the preamble on a PRACH resource associated with the first downlink signal or a first downlink signal combination, wherein the first downlink signal combination comprises the first downlink signal, and the first downlink signal combination is any downlink signal combination.

[0335] Optionally, the first message comprises configuration information, and the processing module 502 is further configured to perform at least one of the following:

[0336] In a case where the configuration information indicates a mapping relationship between the downlink signal combination and the PRACH resource, the first RO resource pool is determined based on the configuration information, the first RO resource associated with the first downlink signal combination is determined in the first RO resource pool according to a preset rule, and the preamble corresponding to the first downlink signal combination is determined from the first RO resource according to the first information;

[0337] In a case where the configuration information indicates a mapping relationship between the downlink signal and the PRACH resource, the first RO resource is determined based on the mapping relationship between the first downlink signal and the PRACH resource, and the preamble associated with the first downlink signal combination on the first RO resource is determined according to the second information;

[0338] The first information and the second information are indicated by the first message.

[0339] Optionally, the preset rule comprises a first rule, and the first rule is used to indicate a mapping relationship between a first signal set and an RO resource, wherein the first signal set comprises a downlink signal and a downlink signal combination, and the mapping relationship between the first signal set and the RO resource is related to at least one of the following:

[0340] an index of the downlink signal;

[0341] an identifier of the downlink signal combination;

[0342] a number of downlink signals contained in the downlink signal combination;

[0343] an index of a downlink signal in the downlink signal combination;

[0344] an arrangement order of the downlink signal and the downlink signal combination.

[0345] Optionally, the preset rule comprises a second rule, and the second rule is used to indicate a mapping relationship between a downlink signal combination and an RO resource, wherein the mapping relationship between the downlink signal combination and the RO resource is related to at least one of the following:

[0346] an identifier of the downlink signal combination;

[0347] a number of downlink signals contained in the downlink signal combination;

[0348] an index of the downlink signal in the downlink signal combination.

[0349] Optionally, the first information comprises at least one of:

[0350] a number of the downlink signal combinations;

[0351] an identity of the downlink signal combination;

[0352] preamble configuration information corresponding to the downlink signal combination;

[0353] a random access type;

[0354] a function of the preamble.

[0355] Optionally, the second information comprises at least one of:

[0356] an identity of the first downlink signal combination;

[0357] a downlink signal included in the first downlink signal combination;

[0358] preamble configuration information corresponding to the first downlink signal combination;

[0359] a number of all downlink signal combinations containing the first downlink signal;

[0360] identities of all downlink signal combinations containing the first downlink signal;

[0361] a preamble mapping order of all downlink signal combinations containing the first downlink signal on the first RO resource;

[0362] preamble configuration information corresponding to all downlink signal combinations containing the first downlink signal;

[0363] a random access type;

[0364] a function of the preamble.

[0365] Optionally, the preamble mapping order is related to at least one of:

[0366] an identity of the downlink signal combination containing the first downlink signal;

[0367] a number of downlink signals included in the downlink signal combination containing the first downlink signal;

[0368] an index of the downlink signal in the downlink signal combination containing the first downlink signal.

[0369] Optionally, in the case that the downlink signal combination is a feature, the second information comprises at least one of:

[0370] an identifier of the downlink signal combination;

[0371] an identifier of the first downlink signal combination;

[0372] a downlink signal included in the first downlink signal combination;

[0373] preamble configuration information corresponding to the first downlink signal combination;

[0374] an index of an RO mask corresponding to the first downlink signal combination.

[0375] Optionally, the preamble configuration information comprises at least one of:

[0376] a preamble starting position;

[0377] a preamble index;

[0378] a preamble quantity.

[0379] Optionally, in a case where the configuration information comprises a PRACH resource identifier, and the PRACH resource identifier is a specific identifier, the processing module 502 performs the first operation.

[0380] Optionally, in a case where the terminal determines the downlink signal combination and the corresponding PRACH resource configuration information based on the configuration information in the first message, the configuration information comprises at least one of: an identifier of the downlink signal combination, an identifier of a downlink signal in the downlink signal combination, a PRACH resource identifier, and an index of a PRACH mask.

[0381] Optionally, in a case where the RACH resource identifier is a numerical value, the PRACH resource identifier is an integer greater than or equal to 0, and the integer is less than a sum of the downlink signal and the quantity of the downlink signal combination.

[0382] Optionally, in a case where the PRACH resource identifier is not the specific identifier, the apparatus selects a preamble resource corresponding to the PRACH resource identifier according to the configuration information.

[0383] Optionally, the processing module 502 is further configured to perform at least one of:

[0384] determine a preamble according to an indication of the PRACH resource configuration information;

[0385] select a preamble within a range of preambles indicated by the PRACH resource configuration information.

[0386] Optionally, wherein:

[0387] The first downlink signal combination is a downlink signal combination composed of N downlink signals with the best measurement results, N being an integer greater than 1; and / or,

[0388] The measurement result of the downlink signal in the first downlink signal combination under a first measurement metric is greater than or equal to a preset threshold first measurement metric.

[0389] Optionally, the first receiving module 501 is further configured to:

[0390] receive a third message sent by the network-side device, the third message being a response message of the second message.

[0391] The random access apparatus 500 provided by the embodiments of the present application can implement each process implemented by the terminal in the method embodiment of FIG. 2 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0392] Referring to FIG. 6, when the random access apparatus is a network-side device or a component in the network-side device, the random access apparatus 600 includes:

[0393] The second sending module 601 is configured to send a first message to the terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used to determine a preamble.

[0394] The second receiving module 602 is configured to receive a second message sent by the terminal using the preamble on a PRACH resource associated with the first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0395] Optionally, the first message includes configuration information, and the configuration information is used to indicate at least one of the following:

[0396] a mapping relationship between a downlink signal and a PRACH resource;

[0397] a mapping relationship between a downlink signal combination and a PRACH resource;

[0398] a PRACH resource identifier.

[0399] Optionally, in the case where the configuration information is used to indicate the mapping relationship between the downlink signal combination and the PRACH resource, the first message is further used to indicate first information, the first information being used to determine a preamble corresponding to a first downlink signal combination.

[0400] The first information includes at least one of the following:

[0401] a number of the downlink signal combinations;

[0402] an identifier of the downlink signal combination;

[0403] preamble configuration information corresponding to the downlink signal combination;

[0404] a random access type;

[0405] a function of the preamble.

[0406] Optionally, the apparatus is further configured to indicate a preset rule to the terminal, the preset rule being used to determine a first RO resource associated with the first downlink signal combination, the first RO resource being a RO resource pool.

[0407] Optionally, the preset rule comprises a first rule, the first rule being used to indicate a mapping relationship between a first signal set and a RO resource, the first signal set comprising a downlink signal and a downlink signal combination, the mapping relationship between the first signal set and the RO resource being related to at least one of the following:

[0408] an index of the downlink signal;

[0409] an identifier of the downlink signal combination;

[0410] a number of downlink signals contained in the downlink signal combination;

[0411] an index of a downlink signal in the downlink signal combination;

[0412] an arrangement order of the downlink signal and the downlink signal combination.

[0413] Optionally, the preset rule comprises a second rule, the second rule being used to indicate a mapping relationship between a downlink signal combination and a RO resource, the mapping relationship between the downlink signal combination and the RO resource being related to at least one of the following:

[0414] an identifier of the downlink signal combination;

[0415] a number of downlink signals contained in the downlink signal combination;

[0416] an index of a downlink signal contained in the downlink signal combination.

[0417] Optionally, in a case where the configuration information is used to indicate the mapping relationship between the downlink signal and the PRACH resource, the first message further comprises second information, the second information being used to determine a preamble associated with the first downlink signal combination on a first RO resource, the first RO resource being a RO resource determined based on the mapping relationship between the first downlink signal and the PRACH resource;

[0418] wherein the second information comprises at least one of the following:

[0419] an identity of the first downlink signal combination;

[0420] downlink signals included in the first downlink signal combination;

[0421] preamble configuration information corresponding to the first downlink signal combination;

[0422] a number of all downlink signal combinations containing the first downlink signal;

[0423] identities of all downlink signal combinations containing the first downlink signal;

[0424] a preamble mapping order of all downlink signal combinations containing the first downlink signal on the first RO resource;

[0425] preamble configuration information corresponding to all downlink signal combinations containing the first downlink signal;

[0426] a random access type;

[0427] a function of a preamble;

[0428] Alternatively, in a case where the downlink signal combination is as a feature, the second information comprises at least one of:

[0429] an identity of a feature of the downlink signal combination;

[0430] an identity of the first downlink signal combination;

[0431] downlink signals included in the first downlink signal combination;

[0432] preamble configuration information corresponding to the first downlink signal combination;

[0433] an index of an RO mask corresponding to the first downlink signal combination.

[0434] Optionally, the preamble configuration information comprises at least one of:

[0435] a preamble starting position;

[0436] a preamble index;

[0437] a number of preambles.

[0438] Optionally, the preamble mapping order is related to at least one of:

[0439] an identity of a downlink signal combination containing the first downlink signal;

[0440] a number of downlink signals included in a downlink signal combination containing the first downlink signal;

[0441] an index of a downlink signal combination comprising the first downlink signal.

[0442] Optionally, in the case that the configuration information comprises the mapping relationship between the downlink signal and the PRACH resource, the configuration information further comprises at least one of the following:

[0443] an index of a downlink signal combination, an index of a downlink signal in the downlink signal combination, an index of a PRACH resource, an index of a PRACH mask.

[0444] Optionally, in the case that the index of the PRACH resource is a numerical value, the index of the PRACH resource is an integer greater than or equal to 0, and the integer is less than the sum of the number of downlink signals and the number of downlink signal combinations.

[0445] Optionally, the second sending module 601 is further configured to:

[0446] send a third message to the terminal, the third message being a response message of the second message.

[0447] The random access device 600 provided by the embodiments of the present application can implement each process of the network side device in the method embodiment of Figure 4 and achieve the same technical effects. To avoid repetition, the details are not described herein.

[0448] As shown in Figure 7, the embodiments of the present application further provide a communication device 700, comprising a processor 701 and a memory 702, wherein the memory 702 stores programs or instructions executable on the processor 701. For example, when the communication device 700 is a terminal, the programs or instructions are executed by the processor 701 to implement each step of the above random access method embodiments and achieve the same technical effects. When the communication device 700 is a network side device, the programs or instructions are executed by the processor 701 to implement each step of the above random access method embodiments and achieve the same technical effects. To avoid repetition, the details are not described herein.

[0449] The embodiments of the present application further provide a terminal, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to run programs or instructions to implement the steps in the method embodiment shown in Figure 2. The terminal embodiment corresponds to the above terminal side method embodiment, and each implementation process and implementation manner of the above method embodiment can be applied to the terminal embodiment and achieve the same technical effects. The terminal can be the random access device shown in Figure 5. Specifically, Figure 8 is a hardware structure schematic diagram of a terminal implementing the embodiments of the present application.

[0450] The terminal 800 includes, but is not limited to, at least part of components such as a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and a processor 810.

[0451] Those skilled in the art can understand that the terminal 800 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 810 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG. 8 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which are not described here.

[0452] It should be understood that in the embodiments of the present application, the input unit 804 can include a graphics processor 8041 and a microphone 8042, and the graphics processor 8041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 806 can include a display panel 8061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 807 includes at least one of a touch panel 8071 and other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 can include two parts of a touch detection device and a touch controller. The other input devices 8072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, which are not described here.

[0453] In the embodiments of the present application, the radio frequency unit 801 can transmit downlink data from the network side device to the processor 810 for processing after receiving the downlink data. In addition, the radio frequency unit 801 can send uplink data to the network side device. Generally, the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0454] The memory 809 can be used to store software programs or instructions and various data. The memory 809 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 809 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 809 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0455] The processor 810 can include one or more processing units; optionally, the processor 810 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 810.

[0456] The radio frequency unit 801 is configured to receive a first message.

[0457] The processor 810 is configured to acquire physical random access channel (PRACH) resource configuration information corresponding to downlink signal combination based on the first message, and determine a preamble according to the PRACH resource configuration information.

[0458] The radio frequency unit 801 is further configured to send a second message using the preamble on PRACH resources associated with the first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

[0459] It should be noted that the terminal provided in the embodiments of the present application can implement all the processes of the method embodiments described in FIG. 2 and achieve the same or corresponding technical effects. To avoid repetition, details are not described herein.

[0460] The embodiments of the present application further provide a network side device, comprising a processor and a communication interface, the communication interface and the processor are coupled, the processor is configured to run programs or instructions to implement the steps of the method embodiments shown in FIG. 4. The network side device embodiments correspond to the network side device method embodiments described above, and each implementation process and implementation manner of the method embodiments described above can be applied to the network side device embodiments, and the same technical effects can be achieved.

[0461] Specifically, the embodiments of the present application further provide a network side device, which can be the random access apparatus shown in FIG. 6. As shown in FIG. 9, the network side device 900 comprises an antenna 91, a radio frequency device 92, a baseband device 93, a processor 94 and a memory 95. The antenna 91 is connected with the radio frequency device 92. In the uplink direction, the radio frequency device 92 receives information through the antenna 91 and sends the received information to the baseband device 93 for processing. In the downlink direction, the baseband device 93 processes the information to be sent and sends it to the radio frequency device 92, and the radio frequency device 92 processes the received information and sends it out through the antenna 91.

[0462] The method performed by the network side device in the above embodiments can be implemented in the baseband device 93, which comprises a baseband processor.

[0463] The baseband device 93 may, for example, comprise at least one baseband board, and a plurality of chips are arranged on the baseband board, as shown in FIG. 9. One of the chips is, for example, a baseband processor, which is connected with the memory 95 through a bus interface to call programs in the memory 95 and perform the network device operations shown in the above method embodiments.

[0464] The network side device can further comprise a network interface 96, which is, for example, a common public radio interface (Common Public Radio Interface, CPRI).

[0465] Specifically, the network side device 900 of the embodiment of the present application further comprises instructions or programs stored on the storage 95 and executable on the processor 94, the processor 94 invokes the instructions or programs in the storage 95 to execute the method performed by each module shown in FIG. 6 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0466] The embodiment of the present application further provides a readable storage medium, the readable storage medium stores programs or instructions, the programs or instructions are executed by a processor to implement various processes of the above random access method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0467] The processor is the processor in the terminal in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0468] The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface and the processor are coupled, the processor is used to run programs or instructions to implement various processes of the above random access method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0469] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0470] The embodiment of the present application further provides a computer program / program product, the computer program / program product is stored in a storage medium, the computer program / program product is executed by at least one processor to implement various processes of the above random access method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0471] The embodiment of the present application further provides a communication system, including a terminal and a network side device, the terminal can be used to execute the steps of the random access method as described above, and the network side device can be used to execute the steps of the random access method as described above.

[0472] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the methods and apparatuses of the present application can be carried out by specific hardware, software, or a combination thereof, and that the scope of the application is not limited to the specific order of execution of the steps described in the examples. In addition, features described in relation to certain examples can be combined in other examples.

[0473] From the above description of the embodiments, it is clear that the above-mentioned method can be realized by means of a computer software product and a general hardware platform, of course, it can also be realized by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disc, optical disc, etc.), and includes a plurality of instructions for making the terminal or network side device execute the method described in each embodiment of the present application.

[0474] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, not restrictive, and those skilled in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A random access method, comprising: receiving, by a terminal, a first message; obtaining, by the terminal, PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determining a preamble according to the PRACH resource configuration information; sending, by the terminal, a second message using the preamble on a PRACH resource associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

2. The method of claim 1, wherein, The first message comprises configuration information, and the terminal obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information, comprising: The terminal performs a first operation, and the first operation comprises at least one of the following: In the case that the configuration information indicates the mapping relationship between the downlink signal combination and the PRACH resource, the terminal determines a first RO resource pool based on the configuration information, and determines a first RO resource associated with the first downlink signal combination in the first RO resource pool according to a preset rule, and determines the preamble corresponding to the first downlink signal combination from the first RO resource according to first information; In the case that the configuration information indicates the mapping relationship between the downlink signal and the PRACH resource, the terminal determines a first RO resource based on the mapping relationship between the first downlink signal and the PRACH resource, and determines the preamble associated with the first downlink signal combination on the first RO resource according to second information; The first information and the second information are indicated by the first message.

3. The method of claim 2, wherein, The preset rule comprises a first rule, and the first rule is used to indicate the mapping relationship between a first signal set and an RO resource, the first signal set comprising a downlink signal and a downlink signal combination, and the mapping relationship between the first signal set and the RO resource being related to at least one of the following: The index of the downlink signal; The identification of the downlink signal combination; The number of downlink signals contained in the downlink signal combination; The index of the downlink signal in the downlink signal combination; The arrangement order of the downlink signal and the downlink signal combination.

4. The method of claim 2, wherein, The preset rule comprises a second rule, and the second rule is used to indicate the mapping relationship between a downlink signal combination and an RO resource, and the mapping relationship between the downlink signal combination and the RO resource being related to at least one of the following: The identification of the downlink signal combination; The number of downlink signals contained in the downlink signal combination; The index of the downlink signal in the downlink signal combination.

5. The method of any one of claims 2-4, wherein, The first information comprises at least one of the following: The number of downlink signal combinations; The identification of the downlink signal combination; The preamble configuration information corresponding to the downlink signal combination; The random access type; The function of the preamble.

6. The method of claim 2, wherein, The second information comprises at least one of the following: The identification of the first downlink signal combination; The downlink signal contained in the first downlink signal combination; The preamble configuration information corresponding to the first downlink signal combination; The number of all downlink signal combinations containing the first downlink signal; an identifier of all downlink signal combinations comprising the first downlink signal; a preamble mapping order of all downlink signal combinations comprising the first downlink signal on the first RO resource; preamble configuration information corresponding to all downlink signal combinations comprising the first downlink signal; a random access type; a use of the preamble.

7. The method of claim 6, wherein, The preamble mapping order is related to at least one of the following: an identifier of the downlink signal combination comprising the first downlink signal; a number of downlink signals included in the downlink signal combination comprising the first downlink signal; an index of the downlink signal in the downlink signal combination comprising the first downlink signal.

8. The method of claim 2, wherein, In a case where the downlink signal combination is taken as a feature, the second information includes at least one of the following: a feature identifier of the downlink signal combination; an identifier of the first downlink signal combination; a downlink signal included in the first downlink signal combination; preamble configuration information corresponding to the first downlink signal combination; an index of an RO mask corresponding to the first downlink signal combination.

9. The method of claim 7 or 8, wherein, The preamble configuration information includes at least one of the following: a preamble starting position; a preamble index; a number of preambles.

10. The method of claim 2, wherein, In a case where the configuration information includes a PRACH resource identifier, the PRACH resource identifier is a specific identifier, the terminal performs the first operation.

11. The method of any one of claims 1-10, wherein, In a case where the terminal determines a downlink signal combination and corresponding PRACH resource configuration information based on the configuration information in the first message, the configuration information includes at least one of the following: a downlink signal combination identifier, a downlink signal identifier in a downlink signal combination, a PRACH resource identifier, and an index of a PRACH mask.

12. The method of claim 11, wherein, In a case where the RACH resource identifier is a numerical value, the PRACH resource identifier is an integer greater than or equal to 0, and the integer is less than the sum of the downlink signal and the number of downlink signal combinations.

13. The method of claim 12, wherein, In a case where the PRACH resource identifier is not a specific identifier, the terminal selects a preamble resource corresponding to the PRACH resource identifier according to the configuration information.

14. The method of any one of claims 1-13, wherein, The determination of the preamble according to the PRACH resource configuration information includes at least one of the following: The terminal determines the preamble according to an indication of the PRACH resource configuration information. The terminal selects a preamble within a preamble range indicated by the PRACH resource configuration information.

15. The method of any one of claims 1-14, wherein: the first downlink signal combination is a downlink signal combination formed by N downlink signals with best measurement results, N being an integer greater than 1; and / or a measurement result of a downlink signal in the first downlink signal combination under a first measurement metric is greater than or equal to a preset threshold.

16. The method of any one of claims 1-15, wherein, The method further includes: The terminal receives a third message sent by the network-side device, the third message being a response message of the second message.

17. A random access method, comprising: a network-side device sending a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to a downlink signal combination, the PRACH resource configuration information being used to determine a preamble; The network side device receives a second message sent by the terminal using the preamble on a PRACH resource associated with the first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, and the first downlink signal combination being any downlink signal combination.

18. The method of claim 17, wherein, The first message comprises configuration information, and the configuration information is used to indicate at least one of the following: a mapping relationship between a downlink signal and a PRACH resource; a mapping relationship between a downlink signal combination and a PRACH resource; an identifier of a PRACH resource.

19. The method of claim 18, wherein, In a case where the configuration information is used to indicate the mapping relationship between the downlink signal combination and the PRACH resource, the first message is used to indicate first information, and the first information is used to determine a preamble corresponding to the first downlink signal combination; The first information comprises at least one of the following: a number of the downlink signal combinations; an identifier of the downlink signal combination; preamble configuration corresponding to the downlink signal combination; a random access type; a function of the preamble.

20. The method of claim 19, wherein, The network side device indicates a preset rule to the terminal, and the preset rule is used to determine a first RO resource associated with the first downlink signal combination from a first RO resource pool, and the first RO resource is an RO resource in the first RO resource pool.

21. The method of claim 20, wherein, The preset rule comprises a first rule, and the first rule is used to indicate a mapping relationship between a first signal set and an RO resource, the first signal set comprising a downlink signal and a downlink signal combination, and the mapping relationship between the first signal set and the RO resource being related to at least one of the following: an index of the downlink signal; an identifier of the downlink signal combination; a number of downlink signals included in the downlink signal combination; an index of a downlink signal in the downlink signal combination; an arrangement order of the downlink signal and the downlink signal combination.

22. The method of claim 20, wherein, The preset rule comprises a second rule, and the second rule is used to indicate a mapping relationship between a downlink signal combination and an RO resource, and the mapping relationship between the downlink signal combination and the RO resource being related to at least one of the following: an identifier of the downlink signal combination; a number of downlink signals included in the downlink signal combination; an index of a downlink signal included in the downlink signal combination.

23. The method of claim 18, wherein, In a case where the configuration information is used to indicate the mapping relationship between the downlink signal and the PRACH resource, the first message further comprises second information, and the second information is used to determine a preamble associated with the first downlink signal combination on a first RO resource, the first RO resource being an RO resource determined based on the mapping relationship between the first downlink signal and the PRACH resource; The second information comprises at least one of the following: an identifier of the first downlink signal combination; a downlink signal included in the first downlink signal combination; preamble configuration information corresponding to the first downlink signal combination; a number of all downlink signal combinations comprising the first downlink signal; identifiers of all downlink signal combinations comprising the first downlink signal; a preamble mapping order of all downlink signal combinations comprising the first downlink signal on the first RO resource; The preamble configuration information corresponding to all downlink signal combinations containing the first downlink signal; A random access type; A function of the preamble; Or, in the case where the downlink signal combination is a feature, the second information includes at least one of the following: A feature identifier of the downlink signal combination; An identifier of the first downlink signal combination; A downlink signal included in the first downlink signal combination; Preamble configuration information corresponding to the first downlink signal combination; An index of an RO mask corresponding to the first downlink signal combination.

24. The method of claim 23, wherein, The preamble configuration information includes at least one of the following: A preamble starting position; A preamble index; A preamble quantity.

25. The method of claim 23, wherein, The preamble mapping order is related to at least one of the following: An identifier of a downlink signal combination containing the first downlink signal; A quantity of downlink signals contained in the downlink signal combination containing the first downlink signal; An index of the downlink signal combination containing the first downlink signal.

26. The method of claim 18, wherein, In the case where the configuration information includes a mapping relationship between the downlink signal and the PRACH resource, the configuration information further includes at least one of the following: A downlink signal combination identifier, a downlink signal identifier in the downlink signal combination, a PRACH resource identifier, an index of a PRACH mask.

27. The method of claim 26, wherein, In the case where the PRACH resource identifier is a numerical value, the PRACH resource identifier is an integer greater than or equal to 0, and the integer is less than the sum of the downlink signal and the downlink signal combination quantity.

28. The method of any one of claims 17-27, wherein, The method further includes: The network side device sends a third message to the terminal, and the third message is a response message of the second message.

29. A random access device, comprising: A first receiving module for receiving a first message; A processing module for obtaining PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determining a preamble according to the PRACH resource configuration information; A first sending module for sending a second message using the preamble on a PRACH resource associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination including the first downlink signal, and the first downlink signal combination being any downlink signal combination.

30. The apparatus of claim 29, wherein, The first message includes configuration information, and the processing module is further configured to perform at least one of the following: In the case where the configuration information indicates a mapping relationship between the downlink signal combination and the PRACH resource, a first RO resource pool is determined based on the configuration information, a first RO resource associated with the first downlink signal combination is determined in the first RO resource pool according to a preset rule, and a preamble corresponding to the first downlink signal combination is determined from the first RO resource according to first information; In the case where the configuration information indicates a mapping relationship between the downlink signal and the PRACH resource, a first RO resource is determined based on the mapping relationship between the first downlink signal and the PRACH resource, and a preamble associated with the first downlink signal combination on the first RO resource is determined according to second information; The first information and the second information are indicated by the first message.

31. The apparatus of claim 29, wherein, The processing module is further configured to perform at least one of the following: determine a preamble according to indication of the PRACH resource configuration information; select a preamble within a range of preambles indicated by the PRACH resource configuration information.

32. The apparatus of any one of claims 29-31, wherein, The first receiving module is further configured to: receive a third message sent by the network-side device, the third message being a response message of the second message. 33.A random access apparatus, comprising: a second sending module configured to send a first message to a terminal, the first message being used to indicate PRACH resource configuration information corresponding to downlink signal combination, the PRACH resource configuration information being used to determine a preamble; a second receiving module configured to receive a second message sent by the terminal using the preamble on PRACH resource associated with a first downlink signal or a first downlink signal combination, the first downlink signal combination comprising the first downlink signal, the first downlink signal combination being any downlink signal combination.

34. The apparatus of claim 33, wherein, The first message comprises configuration information, the configuration information being used to indicate at least one of the following: mapping relationship between downlink signal and PRACH resource; mapping relationship between downlink signal combination and PRACH resource; PRACH resource identifier.

35. The apparatus of claim 33 or 34, wherein, The second sending module is further configured to: send a third message to the terminal, the third message being a response message of the second message. 36.A terminal, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the random access method according to any one of claims 1-16. 37.A network-side device, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the random access method according to any one of claims 17-28. 38.A readable storage medium, the readable storage medium storing programs or instructions, the programs or instructions being executed by a processor to implement steps of the random access method according to any one of claims 1-16, or implement steps of the random access method according to any one of claims 17-28. 39.A computer program product, the computer program product being stored in a storage medium, the computer program product being executed by at least one processor to implement steps of the random access method according to any one of claims 1-16, or implement steps of the random access method according to any one of claims 17-28. 40.A chip, comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being configured to run programs or instructions to implement steps of the random access method according to any one of claims 1-16, or implement steps of the random access method according to any one of claims 17-28.

Images