Random access method and device, terminal and network side equipment

Abstract

The invention discloses a random access method and device, a terminal and network side equipment, and belongs to the technical field of communication, and the random access method comprises the steps that the terminal receives a first message; the terminal obtains PRACH resource configuration information corresponding to a downlink signal combination based on the first message, and determines a lead code according to the PRACH resource configuration information; and the terminal uses the lead code to send a second message on the PRACH resource associated with the first downlink signal or the first downlink signal combination.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a random access method, apparatus, terminal, and network-side equipment. Background Technology

[0002] In cell-free networks, due to the dense deployment of transmit / receive points (TRPs), terminals may receive or detect multiple downlink signals (such as synchronization signal and PBCH block (SSB) signals). In some scenarios, for the random access process of multiple downlink signals, the terminal can only adopt a repetitive transmission method, sending the Physical Random Access Channel (PRACH) multiple times on multiple random access time resources, resulting in high terminal overhead. Alternatively, in some scenarios, when the terminal needs to trigger the transmission of signals within the coverage area of ​​multiple downlink signals (such as uplink wake-up signal (UL-WUS)), the terminal needs to perform multiple signal transmissions, resulting in high terminal resource overhead and transmission power consumption. Summary of the Invention

[0003] This application provides a random access method, apparatus, terminal, and network-side device, which can solve the problem in related technologies where, in the random access process for multiple downlink signals, the terminal repeatedly initiates multiple PRACHs, or when the terminal triggers signal transmission within the coverage area of ​​multiple downlink signals, multiple signal transmissions are required, resulting in high terminal overhead.

[0004] Firstly, a random access method is provided, executed by a terminal, the method comprising:

[0005] The terminal receives the first message;

[0006] The terminal obtains the Physical Random Access Channel (PRACH) resource configuration information corresponding to the downlink signal combination based on the first message, and determines the preamble according to the PRACH resource configuration information;

[0007] The terminal uses the preamble to send a second message on the PRACH resource associated with the first downlink signal or a combination of first downlink signals, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0008] Secondly, a random access method is provided, executed by a network-side device, the method comprising:

[0009] The network-side device sends a first message to the terminal. The first message is used to indicate the PRACH resource configuration information corresponding to the downlink signal combination. The PRACH resource configuration information is used by the terminal to determine the preamble.

[0010] The network-side device receives a second message sent by the terminal on a PRACH resource associated with a first downlink signal or a combination of first downlink signals using the preamble, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0011] Thirdly, a random access device is provided, comprising:

[0012] The first receiving module is used to receive the first message;

[0013] The processing module is used to obtain 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;

[0014] A first transmitting module is configured to transmit a second message using the preamble on a PRACH resource associated with a first downlink signal or a combination of first downlink signals, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0015] Fourthly, a random access device is provided, comprising:

[0016] The second sending module is used to send a first message to the terminal. The first message is used to indicate the PRACH resource configuration information corresponding to the downlink signal combination. The PRACH resource configuration information is used by the terminal to determine the preamble.

[0017] The second receiving module is configured to receive a second message sent by the terminal on a PRACH resource associated with the first downlink signal or a combination of the first downlink signals using the preamble, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0018] Fifthly, a random access device is provided, the device being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0019] In a sixth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0020] In a seventh aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is configured to receive a first message; the processor is configured to obtain 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; the communication interface is further configured to send a second message using the preamble on a PRACH resource associated with the first downlink signal or the first downlink signal combination, wherein the first downlink signal combination includes the first downlink signal, and the first downlink signal combination is any downlink signal combination.

[0021] Eighthly, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the second aspect.

[0022] A ninth aspect provides a network-side device, including a processor and a communication interface, wherein the communication interface is configured to send a first message to a terminal, the first message indicating 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 to receive a second message sent by the terminal on a PRACH resource associated with a first downlink signal or a first downlink signal combination using the preamble, the first downlink signal combination including the first downlink signal, the first downlink signal combination being any downlink signal combination.

[0023] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0024] Eleventhly, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method as described in the first aspect, and the network-side device can be used to perform the steps of the method as described in the second aspect.

[0025] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0026] In a thirteenth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the method as described in the first or second aspect.

[0027] In this embodiment, the terminal receives a first message, obtains PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information. Further, the terminal sends a second message using the preamble on the PRACH resources associated with the first downlink signal or the first downlink signal combination. 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, eliminating the need to initiate multiple PRACHs based on a single downlink signal, effectively reducing terminal overhead and energy consumption. Alternatively, when the terminal triggers signal transmission within the coverage area of ​​multiple downlink signals, the terminal can perform signal transmission based on the downlink signal combination, thereby eliminating the need for multiple signal transmissions, effectively reducing terminal resource overhead and energy consumption, and also helping to improve the transmission rate between the terminal and network-side devices. Attached Figure Description

[0028] Figure 1a This is a block diagram of a wireless communication system applicable to embodiments of this application;

[0029] Figure 1b This is one of the schematic diagrams illustrating the relationship between RO and SSB in related technologies;

[0030] Figure 1c This is the second diagram illustrating the relationship between RO and SSB in related technologies;

[0031] Figure 2 This is one of the flowcharts of a random access method provided in the embodiments of this application;

[0032] Figure 3a This is one of the schematic diagrams illustrating the mapping relationship between an SSB / SSB combination and a PRACH resource that can be applied to the embodiments of this application;

[0033] Figure 3b This is the second schematic diagram of the mapping relationship between an SSB / SSB combination and a PRACH resource that can be applied to the embodiments of this application;

[0034] Figure 3c This is a schematic diagram of the preamble of SSB combination configured based on the FeatureCombinationPreambles framework in the embodiments of this application;

[0035] Figure 3d This is one of the schematic diagrams of RO resource pool partitioning applicable to the embodiments of this application;

[0036] Figure 3e This is a second schematic diagram of an RO resource pool partitioning method applicable to the embodiments of this application;

[0037] Figure 3fThis is a second flowchart of a random access method provided in an embodiment of this application;

[0038] Figure 3g This is the third flowchart of a random access method provided in the embodiments of this application;

[0039] Figure 3h This is the fourth flowchart of a random access method provided in the embodiments of this application;

[0040] Figure 3i This is the fifth flowchart of a random access method provided in the embodiments of this application;

[0041] Figure 4 This is the sixth flowchart of a random access method provided in the embodiments of this application;

[0042] Figure 5 This is a structural diagram of a random access device provided in an embodiment of this application;

[0043] Figure 6 This is a structural diagram of another random access device provided in an embodiment of this application;

[0044] Figure 7 This is a structural diagram of a communication device provided in an embodiment of this application;

[0045] Figure 8 This is a structural diagram of a terminal provided in an embodiment of this application;

[0046] Figure 9 This is a structural diagram of a network-side device provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0048] 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.

[0049] 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.

[0050] It is worth noting that the technologies described in this application are 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 this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0051] Figure 1aThis diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home devices (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game consoles, personal computers (PCs), ATMs, or self-service machines, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side equipment 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (AS), or Wireless Fidelity (WiFi) nodes, etc.In this context, a base station may be referred to as a Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), or any other suitable term in the relevant field, as long as the same technical effect is achieved. The base station is not limited to any specific technical terminology. It should be noted that in this application embodiment, only a base station in an NR system is used as an example for introduction, and the specific type of base station is not limited.

[0052] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (or L-NEF), and Binding Support Function. Support Functions (BSF), Application Functions (AF), Location Management Functions (LMF), Gateway Mobile Location Centres (GMLC), and Network Data Analytics Functions (NWDAF), etc. It should be noted that this application embodiment only uses core network equipment in the NR system as an example and does not limit the specific type of core network equipment. If the name of the core network equipment mentioned in this application embodiment changes in subsequent protocol versions (e.g., 6G), it will still be within the scope of protection of this application.

[0053] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0054] To better understand the technical solution of this application, the relevant concepts that may be involved in the embodiments of this application are explained below.

[0055] 1. Cell-free, massively multi-input multiple-output (MIMO) networks:

[0056] Cell-free massive MIMO (MMIMO) systems break away from the traditional cell concept in MMIMO systems. Instead of being deployed at a single macro base station, a large number of antennas are distributed across a wide area, and UEs are similarly distributed across this area. These antennas are called Transmit-Receive Points (TRPs) or Access Points (APs). Theoretically, each UE can communicate with every TRP. With the help of a fronthaul network and a Central Processing Unit (CPU), the geographically dispersed TRPs can collectively serve a smaller number of UEs. The CPU uses channel statistics for joint detection. This technology holds promise for next-generation indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping malls, stadiums, subways, hospitals, community centers, and university campuses.

[0057] 2. Cell search and synchronization process in NR technology:

[0058] In existing 5G NR technology, 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 NR has a wide spectrum range, to reduce the complexity of the search, the UE performs SSB searches at certain frequency intervals specified in the protocol; this frequency interval is called the synchronization raster. The UE detects the received power (SS Reference Signal Received Power, SS-RSRP) of the synchronization signal at the corresponding frequency point according to the synchronization raster, and selects any SSB whose SS-RSRP is higher than the threshold rsrp-ThresholdSSB. By demodulating the primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH) signals in the selected SSB, the UE completes cell selection and synchronization with the base station, and then performs random access.

[0059] Mapping rules from SSB to RO in 3.5G NR:

[0060] The terminal receives System Information Block (SIB) 1 by receiving SSB. SIB1 contains various parameters for initial access, PRACH resources, and SSB-RO associations configured within it. In NR, a cell can configure multiple frequency division multiplex (FDM) physical random access channel transmission opportunities (PRACH transmission occasions, also called PRACH Occasions, or simply ROs) at a single PRACH transmission time domain location. At any given time, the number of ROs available for FDM can be {1, 2, 4, 8}, determined by the higher-layer parameter msg1-FDM.

[0061] The random access preamble can only be transmitted on the time-domain resources configured by the parameter PRACHConfigurationIndex and the frequency-domain resources configured by the parameter msg1-FDM. PRACH frequency-domain resources n RA ∈{0,1,…,M-1}, where M equals the higher-layer parameter msg1-FDM. At initial access, the PRACH frequency domain resource n RAStarting with the lowest frequency RO resource within the initial active uplink bandwidth part, number them in ascending order; otherwise, use the PRACH frequency domain resource n. RA Number the resources in ascending order, starting with the lowest frequency RO resource within the active uplink bandwidth part. For example, in... Figure 1b In this context, the number of ROs in FDM at a given time is 8 (msg1-FDM=8). The RO resources are numbered sequentially from low to high frequency as RO#0~RO#7.

[0062] In NR, there is an association between ROs and the actual transmitted synchronization signal / physical broadcast channel blocks (SS / PBCH blocks, SSBs). ROs are associated with SSBs in the order of frequency domain (from low to high frequency) followed by time domain. An SSB may be associated with multiple consecutive ROs, or multiple SSBs may be associated with one RO (in which case, different SSBs correspond to different preambles). The number of SSBs associated with each RO is N, which is configured by the network through the parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, as follows: Figure 1c As shown. 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 a RO. For example, the value n4 represents the number of preambles associated with each SSB on a RO, and n8 represents the number of preambles associated with each SSB on a RO.

[0063] The specific mapping rules between SSB and preamble index are as follows: (1) When N < 1, an SSB is mapped to 1 / N consecutive valid ROs. On each associated valid RO, starting from the preamble index 0, the SSB is associated with R consecutive contention-based preambles (CB-preambles) for 4-step RACH (or Type-1 random access) or 2-step RACH (or Type-2 random access) configured separately with 4-step random access. Starting from the preamble index R, it is associated with Q consecutive CB-preambles for 2-step random access configured together with 4-step random access. (2) When N ≥ 1, N SSBs are mapped to one valid RO. On this valid RO, starting from the preamble index 0, the SSB is associated with R consecutive contention-based preambles (CB-preambles) for 4-step RACH (or Type-1 random access) or 2-step RACH (or Type-2 random access) configured separately with 4-step random access. Starting from the preamble index R, it is associated with Q consecutive CB-preambles for 2-step random access configured together with 4-step random access. (2) When N ≥ 1, N SSBs are mapped to one valid RO. On this valid RO, starting from the preamble index 0, the SSB is associated with R consecutive contention-based preambles (CB-preambles) for 2-step random access. Initially, SSBn is associated with R consecutive CB-preambles for four-step random access, or with two-step random access preambles configured separately for four-step random access; from the preamble Initially, SSBn is associated with Q consecutive CB-preambles configured for two-step random access, which are co-configured with four-step random access. Where 0 ≤ n ≤ N-1, It is determined by the four-step random access parameter totalNumberOfRA-Preambles, or by the two-step random access parameter msgA-TotalNumberOfRA-Preambles configured separately from the four-step random access parameter, and is an integer multiple of N.

[0064] After all SSBs have completed one round of association with RO, they constitute an SSB-RO mapping cycle. An SSB-RO association period may contain one or more SSB-RO mapping cycles. An SSB-RO association pattern period may contain one or more SSB-RO association periods. The SSB-RO mapping repeats with the association pattern period as the cycle, and the maximum association pattern period is 160ms.

[0065] Typically, base stations can use different beams to transmit different SSBs. The number of SSBs is configured via the `ssb-PositionsInBurst` parameter; for FR2, the maximum number of SSBs is 64. The UE selects the RO / "RO and preamble combination" associated with the SSB with the strongest signal based on the strength of the received downlink beam / SSB, and then transmits `Msg1`. In this way, the network can determine the SSB selected by the UE based on the received preamble's RO / "RO and preamble combination" and transmit `Msg2` on the corresponding downlink beam to ensure the quality of downlink signal reception.

[0066] by Figure 1b For example, at any given time, there are 8 ROs in the FDM, and 4 SSBs are actually transmitted, namely SSB#0, SSB#1, SSB#2, and SSB#3. Each SSB is associated with 2 ROs. If the UE determines to send PRACH / Msg1 on the RO corresponding to SSB#0, then the UE selects one RO from RO#0 and RO#1 to send the PRACH.

[0067] by Figure 1c For example, at a given moment, the number of ROs in an FDM is 2, and the actual number of SSBs transmitted is 8, namely SSB#0, SSB#1, ..., SSB#7, with each pair of SSBs associated with one RO. When multiple SSBs share a single RO, the Preamble sets associated with these multiple SSBs are different; that is, the same Preamble cannot simultaneously belong to different Preamble sets associated with different SSBs. Figure 1c Taking RO#0 as an example, RO#0 has a total of 60 preambles, of which the preambles with indices 0 to 29 are associated with SSB#0, and the preambles with indices 30 to 59 are associated with SSB#1.

[0068] Before sending PRACH, the UE first selects an SSB with an RSRP higher than a threshold based on the RSRP of the received beam (SSB). If multiple SSBs have RSRPs higher than the threshold, the terminal can select any SSB with an RSRP higher than the threshold. If there are no SSBs with RSRPs higher than the threshold, the UE selects an SSB based on the implementation.

[0069] Based on the network (NW) configuration, the UE obtains the mapping between SSBs and ROs. After selecting an SSB, the RO corresponding to the selected SSB is used as the RO for transmitting PRACH / Preamble / Msg1. If the selected SSB is associated with multiple ROs, the terminal can choose one of the ROs to transmit PRACH / Preamble / Msg1.

[0070] 4. Feature Combination Preambles

[0071] FeatureCombinationPreambles define a set of preambles for a specific feature. The 3GPP TS 38.331 protocol specifies the following features: redCap-r17, smallData-r17, nsag-r17, msg3-Repetitions-r17, msg1-Repetitions-r18, eRedCap-r18, spare2, and spare1. In the RRC configuration information, the featureCombination-r17 field indicates which one or more of the above features the configured preamble is used for, and also indicates the location of these specific preambles (the parameter startPreambleForThisPartition-r17 indicates the starting preamble index; the parameter numberOfPreamblesPerSSB-ForThisPartition-r17 indicates the number of these preambles, i.e., how many preamble indexes they occupy; and the parameter ssb-SharedRO-MaskIndex-r17 indicates which ROs the preambles corresponding to these features are configured on).

[0072] 5. Random Access Procedure

[0073] In the prior art, there are procedures that include contention-based random access procedures and non-contention-based random access procedures.

[0074] In the contention-based 4-step random access procedure (RACH), the UE first sends MSG1 to the network, containing the preamble. After detecting the preamble, the network sends MSG2 / Random Access Response (RAR) message, containing the number of the preamble detected by the network and the uplink radio resources allocated to the UE to send MSG3. After receiving MSG2, the UE confirms that at least one of the preamble numbers carried in MSG2 matches the number of the preamble it sent. Then, according to the resources indicated by RAR, it sends MSG3 containing contention resolution information. After receiving MSG3, the network sends MSG4 containing contention resolution information. Upon receiving MSG4, the UE confirms that the resolution information is consistent with what it sent in MSG3, thus completing the 4-step random access procedure.

[0075] The network includes UL grant information in the RAR to indicate the scheduling information for the MSG3 Physical Uplink Shared Channel (PUSCH), and also includes information such as the Random Access Preamble ID (RACH preamble ID, RAPID), the Temporary Cell Radio Network Temporary Identifier (TC-RNTI), and Timing Advance (TA). If the network does not receive the MSG3 PUSCH, it can schedule the retransmission of the MSG3 PUSCH in the Physical Downlink Control Channel (PDCCH) scrambled with TC-RNTI.

[0076] In a contention-based random access procedure, different UEs randomly select a preamble for transmission. This means different UEs might select the same preamble on the same time-frequency radio resources, a situation known as UE preamble conflict. In this case, different UEs will receive the same RAR (Registered Access Request). Therefore, different UEs will transmit the MSG3 PUSCH according to the scheduling information in the RAR ULgrant. Repetitive transmission of the MSG3 PUSCH is not supported in Rel-15 / 16 random access. The network can only resolve one UE's PUSCH (containing contention resolution information) on a single MSG3 PUSCH scheduling resource. Therefore, the network will include the contention resolution information received in MSG3 in MSG4. If the contention resolution information received by the UE in MSG4 matches the contention resolution information sent by the UE in MSG3 PUSCH, the UE considers the contention resolution successful. If they do not match, the contention resolution is considered unsuccessful.

[0077] If contention resolution fails, the UE will reselect RACH transmission resources, perform PRACH transmission, and attempt another random access attempt.

[0078] 6. PDCCH command triggers RACH

[0079] The PDCCH order is a technique used by the base station (eNB / gNB) to force the UE to initiate the RACH process. When the base station detects that the UE has lost downlink synchronization and has downlink data for the UE, it will trigger the UE to initiate RACH through the PDCCH order. In this case of loss of synchronization, the base station initiates the PDCCH order by sending Downlink Control Information (DCI) format 1_0, along with PRACH preamble and RACH Occasion information on the SSB beam index where the UE is camped. If the gNB finds that its Medium Access Control (MAC) layer buffer has downlink data to be sent to the UE, and the loss of synchronization is due to the UE's time alignment timer expiring, then the gNB will trigger the PDCCH order to resynchronize with the UE.

[0080] If the gNB receives downlink data from the UE but detects that the UE has lost synchronization, it will send a PDCCH order via DCI Format 1_0. This order includes the SSB index, ra-PreambleIndex, and PRACH Mask Index (4-step RACH) / msgA-SSB-SharedRO-MaskIndex (2-step RACH) information to indicate the UE-specific RACH preamble. Based on the specific preamble indicated by the PDCCH order, the UE initiates the RACH procedure to re-complete synchronization and RRC configuration.

[0081] In related technologies, when a terminal receives or detects multiple good SSB signals, for the random access process of multiple SSBs, the terminal can only adopt a repetitive transmission method, sending PRACH / UL-WUS multiple times on multiple random access opportunity resources, resulting in a large overhead for the terminal. In view of this, the embodiments of this application provide a random access method.

[0082] It should be noted that the TRP or TRP set mentioned in this application can be a TRP or TRP set associated with a specific signal, or a TRP or TRP set associated with a certain type or group of reference signals. The TRP can also be generalized to a repeater / Timing Advance Group (TAG) / cell (such as a small cell in a non-terrestrial network, NTN) / Integrated Access and Backhaul (IAB) / beamforming / Quasi co-location (QCL) assumption / Transmission Configuration Indicator state (TCI state) or other signal-associated transmission units for a specific purpose. The TRP mentioned in this application can also correspond to a carrier / carrier group, an SSB / SSB group, a Bandwidth Part (BWP) / BWPgroup, a frequency resource / frequency resource group, or a certain transmission mode.

[0083] The SSB described in this application can also be called any module that includes at least one of a synchronization signal, a broadcast signal, a physical broadcast channel (PBCH), a downlink broadcast channel for other system messages, and a control channel. 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), etc.

[0084] The SSB combination described in this application, also called an SSB set or SSB group, represents a collection of SSBs. The SSBs included in an SSB combination can be of one type (e.g., an SSB for a specific scenario or to meet specific needs), or multiple types of SSBs. It can also include only first-level SSBs, only second-level SSBs, or both first-level and second-level SSBs. The SSB combination described in this application can include one or more TRP SSBs.

[0085] The PRACH resources described in this application include RO resources, preamble resources, PRACH scrambling sequences, and PRACH sequence interleaving resources.

[0086] The PRACH signal or preamble described in this application may also be other uplink signals, such as the WUS signal, used to trigger, request, or activate the transmission of other signals.

[0087] The random access method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0088] Please refer to Figure 2 , Figure 2 This is a flowchart of a random access method provided in an embodiment of this application, wherein the method is applied to a terminal. Figure 2 As shown, the method includes the following steps:

[0089] Step 201: The terminal receives the first message.

[0090] It should be noted that the first message was sent by the network-side device.

[0091] Step 202: The terminal obtains the PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determines the preamble according to the PRACH resource configuration information.

[0092] Optionally, the first message may be a system message (e.g., SIB1) associated with a downlink signal (e.g., SSB), a system message from a neighboring cell, an RRC message, downlink control information, etc.

[0093] In this embodiment, the first message can indicate the PRACH resource configuration information corresponding to the downlink signal combination. For example, the first message can indicate the mapping relationship between the downlink signal combination and PRACH resources through configuration item information, and / or indicate the mapping relationship between the downlink signal and PRACH resources, etc. It should be noted that the above mapping relationship can be configured by the network-side device or predefined by the protocol. Therefore, when the terminal receives the first message, it can obtain the PRACH resource configuration information corresponding to the downlink signal combination based on 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.

[0094] Understandably, the PRACH resource configuration information (e.g., preamble configuration and preamble-to-downlink signal association) can be configured through the current TRP or through other TRPs; the PRACH resource configuration information can be applied to multiple TRPs, for example, a preamble can trigger the transmission of specific downlink signals for multiple TRPs. The PRACH resources described in this embodiment include RO resources, preamble resources, PRACH scrambling sequences, PRACH sequence interleaving resources, etc.

[0095] Furthermore, the terminal determines the preamble based on the PRACH resource configuration information.

[0096] Optionally, determining the preamble based on the PRACH resource configuration information includes at least one of the following:

[0097] The terminal determines the preamble based on the indication of the PRACH resource configuration information;

[0098] The terminal selects a preamble from the range of preambles indicated by the PRACH resource configuration information.

[0099] 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 required preamble. Alternatively, the PRACH resource configuration information indicates a range of preambles, and the terminal selects a suitable preamble within this range as the required preamble. It is understood that the PRACH resource configuration information indicating the preamble and / or the preamble range can be provided to the terminal by the network-side device through the PRACH resource configuration information, thereby making the determination of the preamble more flexible during the terminal's random access process.

[0100] Step 203: The terminal sends a second message using the preamble on the PRACH resource associated with the first downlink signal or the first downlink signal combination, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any downlink signal combination.

[0101] 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.

[0102] Optionally, the first downlink signal or the first downlink signal combination is a downlink signal or downlink signal combination whose measurement result satisfies the first condition.

[0103] In some implementations...

[0104] The first downlink signal combination is a combination of the N downlink signals with the best measurement results, where N is an integer greater than 1;

[0105] 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.

[0106] The measurement results may include, but are not limited to, RSRP, RSRQ, SINR, SNR, SIR, etc.

[0107] The first measurement metrics include, but are not limited to, power, channel quality, signal-to-noise ratio, and interference level.

[0108] For example, the first downlink signal combination includes N downlink signals. These N downlink signals may be the top N downlink signals with the best measurement results under the first measurement metric, or the top N downlink signals whose measurement results reach a predefined measurement threshold.

[0109] Alternatively, the measurement results of all downlink signals in the first downlink signal combination under the first measurement metric are greater than or equal to a preset threshold. In some embodiments, the first downlink signal combination may also refer to a function calculation result of the measurement results of the downlink signals in the combination under the first measurement metric that is greater than or equal to a preset threshold. The function includes, but is not limited to, averaging, median, maximum, minimum, arbitrary values, and weighted averages (the weights of which are indicated by the network-side device or predefined by the protocol). The preset threshold may be specifically configured for the first downlink signal combination, or it may be the same as the threshold defined for the measurement results of a single resource (e.g., SSB) in the first downlink signal combination.

[0110] In this embodiment, the terminal receives a first message, obtains PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determines a preamble according to the PRACH resource configuration information. Further, the terminal sends a second message using the preamble on the PRACH resources associated with the first downlink signal or the first downlink signal combination. Consequently, the network-side device can treat a downlink signal combination consisting of multiple downlink signals as a whole, configure the PRACH resource configuration information of the downlink signal combination, and indicate this to the terminal through the 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, eliminating the need to initiate multiple PRACHs based on a single downlink signal. This effectively reduces the terminal's overhead and energy consumption and also helps improve the transmission performance and transmission rate between the terminal and the network-side device.

[0111] Optionally, the first message includes configuration information. The terminal obtains PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determines the preamble according to the PRACH resource configuration information, including:

[0112] The terminal performs a first operation, which includes at least one of the following:

[0113] When the configuration information indicates the mapping relationship between the downlink signal combination and PRACH resources, the terminal determines the first RO resource pool based on the configuration information, and determines the first RO resource associated with the first downlink signal combination in the first RO resource pool according to the preset rules. The terminal determines the preamble corresponding to the first downlink signal combination from the first RO resource according to the first information, and the first information is indicated by the first message.

[0114] When the configuration information indicates the mapping relationship between downlink signals and PRACH resources, the terminal determines the first RO resource based on the mapping relationship between the first downlink signals and PRACH resources, and determines the preamble associated with the first downlink signal combination on the first RO resource according to the second information;

[0115] The first information and the second information are indicated through the first message.

[0116] In one implementation, the network-side device may treat downlink signal combinations as independent downlink resources (which can be considered a virtual resource), configure a mapping relationship between individual downlink signal combinations and PRACH resources, and instruct the terminal to provide this configuration information via a first message. Upon receiving the first message, the terminal can obtain the configuration information and determine a first RO resource pool based on the mapping relationship between the downlink signal combinations and PRACH resources indicated by the configuration information. For example, the first RO resource pool may be composed of all RO resources corresponding to the downlink signal combinations according to the mapping relationship. Further, the terminal determines the first RO resource associated with a 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 determines the preamble corresponding to the first downlink signal combination from the first RO resource according to the first information.

[0117] It should be noted that the configuration information may be a public RACH resource configuration (similar to the RACH-ConfigCommon configuration in NR), or a resource configuration related to requesting system messages (such as the SI-RequestConfig configuration in NR), or other possible configuration parameters. The above examples are not intended to limit the configuration information of this application.

[0118] Optionally, when downlink signals and downlink signal combinations share the same RO resource pool, the preset rule includes a first rule, which indicates the mapping relationship between a first signal set and RO resources. The first signal set includes downlink signals and downlink signal combinations, and the mapping relationship between the first signal set and RO resources is related to at least one of the following:

[0119] (1) The index of the downlink signal; for example, it may be mapped to the RO resource in ascending order of the downlink signal index, or in descending order of the downlink signal index, or mapped to the RO resource in a certain predefined pattern or order.

[0120] (2) The identifier of the downlink signal combination; for example, it can be mapped to RO resources in ascending order of downlink signal combination identifiers, or in descending order of downlink signal combination identifiers, or mapped to RO resources according to a certain predefined pattern or order. The identifier of the downlink signal combination can be an index of the downlink signal combination, or a downlink signal combination pattern identifier.

[0121] (3) The number of downlink signals contained in the downlink signal combination; for example, the downlink signal combination is mapped to RO resources in order of the number of downlink signals contained in the downlink signal combination from small to large (or from large to small); or the downlink signal combination is mapped to RO resources in a certain predefined pattern or order according to the number of downlink signals contained in the downlink signal combination.

[0122] (4) The index of the downlink signal in the downlink signal combination; for example, based on the smallest downlink signal index (or the largest downlink signal index, or the sum of all downlink signal indices) in the downlink signal combination, the downlink signal combination is mapped to RO resources in ascending order (or descending order, or a predefined pattern or 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 second largest) downlink signal index in the downlink signal combination, and so on.

[0123] (5) The order of the downlink signals and the downlink signal combinations; for example, the downlink signals can be arranged first and the downlink signal combinations can be arranged later and mapped to the RO resources, or the downlink signal combinations can be arranged first and the downlink signals can be arranged later and mapped to the RO resources.

[0124] It should be noted that the first rule may be predefined or may be indicated to the terminal by the network-side device. For example, the first message may carry the first rule or may be indicated through other indication information.

[0125] In this embodiment, the mapping relationship between downlink signals and downlink signal combinations and RO resources indicated by the first rule can be configured based on the above-mentioned various methods, thereby making the configuration of the mapping relationship more flexible. When downlink signals and downlink signal combinations share the RO resource pool, based on the first rule, the terminal can determine the RO resources 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 resources associated with that downlink signal combination, so that the terminal can initiate random access on the PRACH resources associated with that downlink signal combination, effectively saving terminal power consumption.

[0126] Optionally, when the network-side device configures an independent RO resource pool for the downlink signal combination, i.e., it does not share the RO resource pool with the downlink signal, the preset rule may include a second rule. The second rule is used to indicate the mapping relationship between the downlink signal combination and the RO resources. The mapping relationship between the downlink signal combination and the RO resources is related to at least one of the following:

[0127] (1) The identifier of the downlink signal combination; for example, it can be mapped to RO resources in ascending order of downlink signal combination identifiers, or in descending order of downlink signal combination identifiers, or mapped to RO resources according to a certain predefined pattern or order. The identifier of the downlink signal combination can be an index of the downlink signal combination, or a downlink signal combination pattern identifier.

[0128] (2) The number of downlink signals contained in the downlink signal combination; for example, the downlink signal combination is mapped to RO resources in order of the number of downlink signals contained in the downlink signal combination from small to large (or from large to small); or the downlink signal combination is mapped to RO resources in a certain predefined pattern or order according to the number of downlink signals contained in the downlink signal combination.

[0129] (3) The index of the downlink signal in the downlink signal combination. For example, based on the smallest downlink signal index (or the largest downlink signal index, or the sum of all downlink signal indices) in the downlink signal combination, the downlink signal combination is mapped to RO resources in ascending order (or descending order, or some predefined pattern or 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 second largest) downlink signal index in the downlink signal combination, and so on.

[0130] It should be noted that the second rule can be predefined, or it can be indicated to the terminal by the network-side device. For example, the first message carries the first rule, or it can be indicated through other indication information.

[0131] In this embodiment, the mapping relationship between downlink signal combinations and RO resources indicated by the second rule can be configured based on the above-mentioned various methods, thereby making the configuration of the mapping relationship more flexible. When the network-side device additionally configures a separate RO resource pool for the downlink signal combination, based on this second rule, the terminal can determine the RO resources 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 resources associated with that downlink signal combination, so that the terminal can initiate random access on the PRACH resources associated with that downlink signal combination, effectively saving terminal power consumption.

[0132] Optionally, the first information includes at least one of the following:

[0133] (1) The number of downlink signal combinations;

[0134] (2) The identifier of the downlink signal combination;

[0135] (3) Preamble configuration information for each downlink signal combination; including the total number of preambles corresponding to each downlink signal combination. The number of preambles and / or the preamble start position (corresponding preamble index) for random access (CBRA and / or CFRA and / or four-step RACH and / or two-step RACH and / or Group A / Group B) are at least one of the following: the number of preambles and / or the preamble start position (corresponding preamble index); 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.

[0136] (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.

[0137] (5) Functions of preambles; for example, preambles are used for system information (SI) requests, including requests for SIB information, or master information (MI) requests, including requests for MIB information; or for wake-up, including preamble signals for WUS, which the terminal sends to wake up specific behaviors on the network side.

[0138] In another implementation, the terminal obtains the PRACH resource configuration information corresponding to the downlink signal combination based on the first message, and determines the preamble according to the PRACH resource configuration information. Specifically, the downlink signal combination does not have 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. The network-side device indicates the configuration information indicating this mapping relationship to the terminal through the first message. A certain downlink signal combination is defined as a first downlink signal combination, which includes a first downlink signal. Upon receiving the first message, the terminal can obtain the aforementioned configuration information. Based on the mapping relationship between the first downlink signal and the PRACH resource indicated by the configuration information, the terminal determines the RO resource associated with the first downlink signal. Further, the terminal determines the preamble corresponding to the first downlink signal combination on the RO resource according to the second information.

[0139] Optionally, the second information includes at least one of the following:

[0140] (1) The identifier of the first downlink signal combination;

[0141] (2) The downlink signals included in the first downlink signal combination, that is, which downlink signals are included in the first downlink signal combination;

[0142] (3) Preamble configuration information corresponding to the first downlink signal combination; the preamble configuration includes at least one of the following: preamble start position, number of preambles, preamble index, and position of the last preamble. The preamble start position is also the preamble start position corresponding to the first downlink signal combination (e.g., it can be determined based on the corresponding preamble index); the number of preambles is also the total number of preambles in the first downlink signal combination, including preambles used for CBRA / CFRA / two-step RACH / four-step RACH / Group A / Group B; the position of the last preamble can be determined based on the preamble index. It should be noted that the preamble configuration can be the same or different across different downlink signal combinations, i.e., it can be configured as a common parameter shared by the downlink signal combinations, or configured specifically for each downlink signal combination.

[0143] (4) The number of all downlink signal combinations that include the first downlink signal;

[0144] (5) Identifiers of all downlink signal combinations containing the first downlink signal; it should be noted that the identifiers of all downlink signal combinations are the identifiers of each downlink signal combination containing the first downlink signal, that is, there are multiple identifiers, rather than all downlink signal combinations corresponding to one specific identifier.

[0145] (6) The preamble mapping order of all downlink signal combinations including the first downlink signal on the first RO resource;

[0146] (7) Preamble configuration information for all downlink signal combinations corresponding to the first downlink signal, wherein the preamble configuration information may refer to the previous description and will not be repeated here;

[0147] (8) Random access type; including at least one of four-step RACH (Type-1 RACH), two-step RACH (Type-2 RACH), CBRA, and CFRA;

[0148] (9) The function of the preamble can also be described in the previous description, and will not be repeated here.

[0149] Optionally, the preamble mapping order is related to at least one of the following:

[0150] (1) An identifier for a downlink signal combination containing the first downlink signal; for example, the identifiers of the downlink signal combinations containing the first downlink signal may be mapped to RO resources in ascending order, or in descending order, or according to a predefined pattern or order. The identifier of the downlink signal combination may be an index of the downlink signal combination or a downlink signal combination pattern identifier.

[0151] (2) The number of downlink signals contained in the downlink signal combination containing the first downlink signal; for example, mapping all downlink signal combinations containing the first downlink signal to RO resources in ascending (or descending) order according to the number of downlink signals contained in each of them; or mapping the downlink signal combinations to RO resources according to a certain predefined pattern or order.

[0152] (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 RO resources according to the smallest downlink signal index (or the largest downlink signal index, or the sum of all downlink signal indices) among these downlink signal combinations, in ascending order (or descending order, or some predefined pattern or 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 second largest) downlink signal index among the downlink signal combinations, and so on.

[0153] In this embodiment of the application, without configuring a separate mapping relationship between downlink signal combinations and PRACH resources, i.e. only configuring the mapping relationship between downlink signals and PRACH resources, the downlink signal combination is associated with a portion of the preambles on the PRACH resources (e.g., RO resources) to which the downlink signals included in the downlink signal combination are mapped. This determines the preambles associated with the downlink signal combination, which helps the terminal quickly determine the preambles and enables the terminal to initiate random access on the PRACH resources associated with the downlink signals based on these preambles.

[0154] Optionally, when the downlink signal combination is used as a feature (based on, for example, a FeatureCombinationPreambles framework similar to NR, configuring preamble resources corresponding to each downlink signal (SSB) combination), the second information includes at least one of the following:

[0155] The feature identifier of the downlink signal combination; for example, in the FeatureCombinationPreambles field, it indicates that the feature type is ssbCombination (i.e., downlink signal combination);

[0156] The identifier of the first downlink signal combination;

[0157] The downlink signals included in the first downlink signal combination;

[0158] The preamble configuration information corresponding to the first downlink signal combination;

[0159] The index of the RO mask corresponding to the first downlink signal combination represents the distribution of the preamble on the RO; it is used to indicate which RO or which ROs have deployed the preamble corresponding to the first combination; for example, configuring a parameter similar to NR's ssb-SharedRO-MaskIndex in the feature combination configuration (similar to NR's FeatureCombinationPreambles) field to indicate which RO or which ROs have deployed the preamble corresponding to the first combination.

[0160] It should be noted that the identifier 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 in the previous description, and will not be repeated here.

[0161] In this embodiment of the application, the content of the second information is defined when the downlink signal combination is used as a feature. Thus, 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. In other words, the method of how the terminal determines the preamble associated with the downlink signal combination when the downlink signal combination is used as a feature is defined, which helps the terminal to quickly determine the preamble.

[0162] Optionally, if the configuration information indicated by the first message includes a PRACH resource identifier, and the PRACH resource identifier is a specific identifier, the terminal performs the first operation described above. The specific implementation of the first operation is as described above and will not be repeated here.

[0163] It should be noted that the PRACH resource identifier includes, but is not limited to, numerical values ​​(e.g., indexes), letters, images, etc. For example, when the PRACH resource identifier is a numerical value, the specific identifier can be 0. Optionally, when the terminal determines the 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: downlink signal combination identifier, downlink signal identifier in the downlink signal combination, PRACH resource identifier, and PRACH mask index (MaskIndex).

[0164] In this embodiment of the application, the network-side device can configure the correspondence between downlink signal combinations and PRACH resources, and instruct the terminal with the configuration information through a first message, so that the terminal can determine the PRACH resources corresponding to the downlink signal combinations based on the configuration information.

[0165] In some implementations, the configuration information may be a proprietary RACH configuration (similar to NR's RACH-ConfigDedicated configuration), which may be indicated by the network-side device through system messages or RRC messages (i.e., the first message).

[0166] For example, based on the NR framework, the terminal obtains downlink signal combinations and corresponding PRACH preamble resources in the downlink signal resource configuration (similar to NR's RACH-ConfigDedicated configuration ssb-ResourceList); for example, the SSB resource configuration (similar to NR's ssb-ResourceList) includes SSB combinations and corresponding preamble resources (PRACH resource identifier, such as NR's ra-PreambleIndex parameter).

[0167] In some implementations, the configuration information may be for beam failure recovery scenarios, such as BeamFailureRecoveryConfig configuration, which may be indicated by the network-side device through RRC messages or downlink control information (i.e., the first message).

[0168] For example, based on the NR framework, the terminal obtains the RO-Preamble resource associated with the downlink signal combination in the PRACH-ResourceDedicatedBFR of BeamFailureRecoveryConfig; for example, the PRACH-ResourceDedicatedBFR includes the mapping relationship between the downlink signal combination and the RO-preamble resource (PRACH resource identifier, such as the ra-PreambleIndex parameter of NR).

[0169] In some implementations, the configuration information may also be a PDCCH order (such as a PDCCHorder triggered in NR), which can be indicated by the network-side device through downlink control information (i.e., the first message); the terminal determines the PRACH resources and the corresponding SSB combination by receiving the configuration information, and sends the PRACH signal (Msg1 / MsgA).

[0170] Optionally, when the RACH resource identifier is a numerical value, the RACH 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.

[0171] When the PRACH resource identifier is 0, the terminal selects the preamble resource for CBRA, that is, the terminal performs the first operation mentioned above, which will not be described in detail here.

[0172] Optionally, if the PRACH resource identifier is not a specific identifier (e.g., 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, in a PDCCH order-triggered RACH scenario (and other communication scenarios, not listed here), if the PRACH resource identifier is greater than 0, the terminal selects the CFRA preamble resource corresponding to the PRACH resource identifier.

[0173] Optionally, the PRACH resource identifier can be a binary sequence of more than 6 bits, where 0 to 63 represent the preamble index corresponding to the downlink signal, and a PRACH resource identifier greater than 63 represents the preamble index corresponding to the downlink signal combination.

[0174] In this embodiment of the application, after the terminal sends the second message, the method further includes:

[0175] The terminal receives a third message sent by the network-side device, the third message being a response message to the second message.

[0176] Optionally, the third message may be, for example, Msg2, MsgB, SIB information, MIB information, PBCH, RRC configuration information, or a first reference signal (e.g., SSB, which may refer to on-demand SSB, second-level SSB, etc.; or reference signals such as CSI-RS, TRS, DMRS, PRS, PTRS, etc.).

[0177] For example, when the preamble in the second message is associated with a certain downlink signal combination as UL-WUS, and the third message is the first reference signal, then:

[0178] When the first reference signal is an SSB, the network-side device sends all the SSBs in the SSB combination associated with the preamble;

[0179] When the first reference signal is another reference signal that is quasi-co-located with the SSB (e.g., CSI-RS), the network side transmits all reference signals of any SSB quasi-co-located in the SSB combination associated with the preamble;

[0180] When the first reference signal is on-demand SSB, the UE can obtain the resource configuration information from the system message of the neighboring cell (i.e., the first message), and then obtain the mapping relationship between SSB and RO-preamble resources.

[0181] For example, when the third message is not a reference signal associated with the second message, such as Msg2, the third message sends all reference signals (such as DMRS) and quasi-co-addresses the reference signal associated with the second message.

[0182] In this embodiment, by using PRACH resource configuration information based on downlink signal combinations, the terminal can initiate PRACH based on downlink signal combinations composed of multiple downlink signals. The network-side device can adjust the downlink signal transmission direction according to RO-preamble information to better align with the terminal's direction. Furthermore, the network-side device can determine the cooperating TRP cluster of the serving terminal (e.g., each TRP corresponds to a downlink signal or downlink signal combination) based on RO-preamble information, and initiate MTRP joint transmission starting with Msg2 / MsgB, improving transmission rate and reliability. Additionally, UL-WUS based on multiple SSBs can trigger the transmission of on-demand SSB / SIB / CSI-RS signals or on-demand SIB / MIB messages with a single transmission, eliminating the need for repetition and reducing terminal resource overhead and implementation complexity.

[0183] To better understand the technical solution of this application, the following explanation and illustration will be provided through several specific embodiments.

[0184] For example, in some implementations:

[0185] In the first configuration, the parameter ssb-combinationPatternNumber is defined, which represents the total number of SSB combination patterns.

[0186] If N≥1, for each valid RO resource, the nth (0≤n≤N-1) preamble resource associated with an SSB or SSB combination is obtained from the preamble index. In the beginning, among them Indicated by the four-step RACH parameter totalNumberOfRA-Preambles, or by the two-step RACH parameter msgA-TotalNumberOfRA-Preambles indicated by the four-step RACH, and is an integer multiple of N.

[0187] Furthermore, the parameter `perPattern-CB-PreamblesPerSSB` can be defined to represent the number of CB-preambles corresponding to each SSB combination pattern. The `perPattern-CB-PreamblesPerSSB` parameter can default to the same parameter as the one defined in `ssb-perRACH-OccasionAndCB-PreamblesPerSSB`, or it can indicate a single numerical value, or a vector where each value represents the number of CB-preambles corresponding to each SSB combination pattern.

[0188] Furthermore, for SSB combinations, the number of CB-preambles used for four-step RACH and two-step RACH can be indicated respectively.

[0189] For example, set the parameters totalNumberOfRA-Preambles=64, ssb-perRACH-Occasion=N=4, ssb-Number=3, and ssb-combinationPatternNumber=2. (The rest of the text appears to be a list of parameters and doesn't translate directly.) Figure 3a As shown, the nth SSB or SSB combination starts from the sequence number. The initial (i.e., when 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, the preambles are in the following order: SSB1-preamble, SSB2-preamble, SSB3-preamble, SSB combination pattern1-preamble, and SSB combination pattern2-preamble. 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}, and RO#2 is associated with {SSB combination pattern#1, SSB combination pattern#2, SSB#0, SSB#1}.

[0190] Additionally, in the first configuration (e.g., SI-RequestConfig), preamble resource parameters for SI-request, MI-request, and WUS based on SSB combinations can be specified, including at least one of the following:

[0191] (1) The first index is used to indicate the preamble index for SI-request, MI-request, and WUS to start the preamble, such as parameter ra-PreambleStartIndex;

[0192] Define N SSBs or SSB combinations as associated with a RO resource. When N≥1, for the i-th SSB or SSB combination (i=0,…,N-1), the preamble index = ra-PreambleStartIndex+i is used for SI requests. For N<1, the preamble index = ra-PreambleStartIndex is used for SI requests.

[0193] (2) First time resources, used to indicate the time resources for sending SI-request, MI-request, WUS to request the network to send System Information Block (SIB), Master Information Block (MIB), and downlink reference signal, such as the parameter ra-AssociationPeriodIndex;

[0194] (3) First indication information, used to indicate the RO resources sent by SI-request, MI-request, WUS, such as parameter ra-ssb-OccasionMaskIndex.

[0195] Based on the first configuration information associated with the first SSB combination, the terminal sends a preamble sequence indicated by the first sequence number on the RO resource indicated by the first indication information within the time indicated by the first time resource. This is used to trigger the network to send system information (SIB or MIB information) associated with the first SSB combination within the scope of the first SSB combination, or to trigger the network to send all SSBs contained in the first SSB combination.

[0196] After receiving the preamble sequence, the network side sends system information (SIB or MIB information) associated with the first SSB combination based on the association between the preamble index and the SSB combination, or sends all SSBs contained in the first SSB combination to the network.

[0197] In this embodiment, when the SSB (i.e., the downlink signal) and the SSB combination (i.e., the downlink signal combination) share the RO resource pool, and the network side is configured with a 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. This eliminates the need to initiate multiple PRACHs based on a single downlink signal, effectively reducing the terminal's overhead and energy consumption.

[0198] Alternatively, in some implementations:

[0199] (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 it can indicate a single value, or it can indicate a vector, in which each value represents the number of CB-preambles corresponding to each SSB combination pattern; further, for SSB combinations, the number of CB-preambles used for four-step RACH and two-step RACH can be indicated respectively.

[0200] On each valid RO mapped to SSBn, the number of CB-preambles is determined by the parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB. For an SSB combination pattern associated with SSBn (i.e., an SSB combination containing SSB n, for example, an SSB combination pattern of SSB n + SSB m), it is mapped to a preamble sequentially from front to back according to a default rule, which includes at least one of the following: SSB combination pattern index from smallest to largest, number of SSBs in an SSB combination from smallest to largest, (minimum) SSB index of an SSB combination from smallest to largest, and sum of SSB indices of an SSB combination from smallest to largest.

[0201] On the effective RO associated with SSB, the preamble mapping position of SSB and SSB combination is as follows: Figure 3b As shown, there are two configuration options:

[0202] Opt1 (Option 1): Within the CB-preamble range of each SSB, from front to back, the order is SSB preamble, and the preamble of SSB combinations (as described above);

[0203] Opt2 (Option 2): In each SSB Within each preamble range, after the CB-preamble range originally defined for each SSB, the preambles of the SSB combinations are arranged sequentially from front to back (in the order described above).

[0204] For example, such as Figure 1b As shown, the number of CB-preambles associated with SSB is defined as 40, and the number of CB-preambles associated with each SSB combination is perPattern - CB-PreamblesPerSSB = 10. Therefore, on the effective RO#0 associated with SSB#0:

[0205] ① When Opt1 is configured, the CB-preamble range of SSB#0 is preamble index 0 to 19, the CB-preamble range of SSB combination pattern1 is preamble index 20 to 29, and the CB-preamble range of SSB combination pattern2 is preamble index 30 to 39.

[0206] ② When Opt2 is configured, the CB-preamble range of SSB#0 is preamble index 0 to 39, the CB-preamble range of SSB combination pattern1 is preamble index 40 to 49, and the CB-preamble range of SSB combination pattern2 is preamble index 50 to 59.

[0207] (2) Alternatively, in the first configuration, the starting preamble index of the CB-preamble corresponding to each SSB combination pattern is indicated (or, the starting preamble index and the corresponding number of CB-preambles), and the range of CB-preamble corresponding to each SSB combination pattern i is from the starting preamble index of the pattern i to the starting preamble index-1 of the next SSB or SSB combination.

[0208] In this implementation, when SSBs and SSB combinations share the RO resource pool and the network side does not configure separate PRACH resources for SSB combinations, the terminal determines the PRACH resources associated with the first SSB combination (including the first SSB) based on the mapping relationship between the first SSB and PRACH resources, and initiates random access based on the first SSB combination. This eliminates the need to initiate multiple PRACHs, effectively reducing the terminal's overhead and energy consumption.

[0209] Alternatively, in some implementations:

[0210] The terminal receives the SIB, obtains the RACH-ConfigCommon configuration, determines that the feature type in the FeatureCombinationPreamblesfield is an SSB combination (featureCombination = ssbCombination), and obtains the pattern / composition of the SSB combination (ssbCombinationPattern), for example, a combination of SSB#0 + SSB#1.

[0211] Furthermore, the terminal obtains the preamble configuration parameters of the SSB combination, including the starting preamble index (startPreambleForThisPartition), the number of preambles (nrofPreambleForThisPartition), and the distribution on the RO (ssb-SharedRO-MaskIndex), and determines the corresponding preamble range.

[0212] For example, the parameter is assigned the following value:

[0213] featureCombination=ssbCombination;

[0214] ssbCombinationPattern={0,1};

[0215] startPreambleForThisPartition=12;

[0216] nrofPreambleForThisPartition=10;

[0217] ssb-SharedRO-MaskIndex=RO1 Only;

[0218] totalNumberOfRA-Preambles=60;

[0219] ssb-perRACH-OccasionAndCB-PreamblesPerSSB=two+n12.

[0220] So, if Figure 3c As shown, the preamble range of the SSB combination pattern of SSB#0+SSB#1 is as follows: Figure 3c As shown in the area where SSB combination mode 1 is located, preamble indices 12-21 and preamble indices 42-51 are configured on RO#1.

[0221] In this implementation, a new PRACH resource corresponding to an SSB combination is configured under the functional combination preamble framework. The terminal can determine information such as the preamble based on the configured PRACH resource corresponding to the SSB combination, which helps the terminal initiate a random access procedure based on the SSB combination.

[0222] Alternatively, in some implementations:

[0223] The network indicates a set of PRACH configurations, in which the RO resource pools of SSB and SSB combinations are distinguished in at least one of the following ways: FDM, TDM, RO group.

[0224] FDM method: such as Figure 3dAs shown, for example, if an SSB (i.e., the single SSB marked in the figure) and an SSB combination (i.e., the SSB combination marked in the figure) allocate RO resources in the frequency domain at a ratio of 3:1, then the RO resource pool of the SSB combination is {RO#3, RO#7, RO#11}.

[0225] TDM method: such as Figure 3d As shown, for example, if an SSB (i.e., the single SSB marked in the figure) and an SSB combination (i.e., the SSB combination marked in the figure) allocate RO resources in the time domain at a ratio of 2:1, then the RO resource pool of the SSB combination is {RO#8, RO#9, RO#10, RO#11}.

[0226] Furthermore, within the RO resource pool of the SSB combination, the mapping between the SSB combination and the RO resources is performed according to the second rule.

[0227] RO group method: such as Figure 3e As shown, for example, the RO resource pool of SSB (i.e., the single SSB marked in the figure) corresponds to RO group#1, and the RO resource pool of SSB combination (i.e., the SSB combination marked in the figure) corresponds to RO group#2. Then the RO resource pool of SSB combination is {RO#1-0, RO#1-1, RO#1-2, RO#1-3, RO#1-4, RO#1-5}.

[0228] Within each RO group, RO resource identifiers can be arranged in ascending order in the time domain and ascending order in the frequency domain (e.g., ...). Figure 3e (as shown); or, first arrange them from low to high in the frequency domain, and then from small to large in the time domain.

[0229] Furthermore, within the RO resource pool of the SSB combination, the mapping between the SSB combination and the RO resources is performed according to the second rule.

[0230] In this implementation, the network side can configure a separate RO resource pool for SSB combinations. When the network side indicates a set of PRACH configurations, the terminal uses a certain method to distinguish between the RO resource pools of SSBs and SSB combinations, thereby ensuring that the terminal can accurately determine the RO resources corresponding to the SSB combination.

[0231] Alternatively, in some implementations:

[0232] (1) The terminal obtains the ssb-perRACHOccasion parameter, i.e., parameter N, from the RACH-ConfigDedicated configuration. When N<1, one SSB or SSB combination is mapped to 1 / N RO resources; when N≥1, N consecutive SSBs or SSB combinations are associated with one RO resource. RO resources can also be called PRACH Occasions or RACH Occasions.

[0233] For example, set the parameters totalNumberOfRA-Preambles=64, ssb-perRACH-Occasion=N=4, ssb-Number=3, ssb-combinationPatternNumber=2. For example, if {RO#1,RO#2,RO#3} is a RO resource pool (i.e., resource set) used 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}.

[0234] (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 associated with the SSB combination (i.e., ra-PreambleIndex), wherein the range of ra-PreambleIndex is 0 to N_max, and N_max is the maximum number of SSBs + the number of SSB combinations - 1.

[0235] In this implementation, when SSBs and SSB combinations 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 on the corresponding RO resource based on the SSB combination, effectively saving terminal energy consumption and overhead?

[0236] Alternatively, in some implementations:

[0237] Please refer to Figure 3f :

[0238] Step 1: The network-side device sends the first message (i.e., PDCCH order DCI 1_0) to the UE;

[0239] 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 procedure.

[0240] Specifically, the UE obtains the SSB index or SSB combination pattern, as well as the PRACH resource identifier ra-PreambleIndex, from the first message;

[0241] If ra-PreambleIndex>0, then the UE uses the preamble index indicated by ra-PreambleIndex to send the preamble (i.e., Msg1) and initiate the CFRA random access procedure.

[0242] Alternatively, if ra-PreambleIndex = 0, then the UE uses the CBRA preamble index, sends the preamble (i.e., Msg1), and initiates the CBRA random access procedure.

[0243] If the fourth information indicates an SSB combination pattern, then the UE sends Msg1 according to the protocol predefined method, including at least one of the following:

[0244] Method 1: Send Msg1 repetition based on all SSB directions in the SSB combination pattern;

[0245] Method 2: Send Msg1 in a direction predefined by the SSB combination pattern.

[0246] Step 3: The terminal receives Msg2 from the network side;

[0247] Step 4: The terminal receives the RRC reconfiguration message sent by the network side and performs RRC reconfiguration according to the message.

[0248] In this embodiment, the terminal can select the corresponding random access method based on whether the PRACH resource identifier indicated in the first message is 0, so that the terminal can initiate PRACH in different ways, making the terminal's random access method more flexible.

[0249] Alternatively, in some implementations:

[0250] The terminal receives the first message and sends a preamble based on SSB combination (i.e., the second message) as a UL-WUS signal to trigger the transmission of on-demand SSB / SIB / CSI-RS signals or on-demand SIB / MIB messages.

[0251] For example, please refer to Figure 3g :

[0252] Step 1: The network-side device sends a synchronization signal (e.g., PSS, SSS signal) that does not contain PBCH to the UE;

[0253] Step 2: The terminal sends the preamble of the first SSB combination based on the pre-configured preamble information;

[0254] 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.

[0255] In this implementation, the terminal can trigger on-demand MIB or PBCH message transmission based on the WUS signal of the SSB combination, avoiding multiple signal transmissions and effectively saving terminal resource overhead and energy consumption.

[0256] For example, please refer to Figure 3h :

[0257] Step 1: The network-side device sends system information (MIB, or common SIB information) to the UE;

[0258] Step 2: The terminal sends the preamble of the first SSB combination based on the configured preamble information;

[0259] Step 3: The network-side device receives the preamble of the first SSB combination from the terminal and sends the Specific on-demand SIB system information associated with the first SSB combination, such as the XDD duplex configuration, DTX-DRX configuration, etc. associated with the first SSB combination.

[0260] In this implementation, 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, effectively improving the transmission performance between the terminal and the network side.

[0261] For example, please refer to Figure 3i :

[0262] Step 1: The neighboring network-side device or other network-side device sends the first message (e.g., SIB system information) to the UE;

[0263] Step 2: Based on the SSB and RO-preamble configuration information of the cell notified by the neighboring cell network side device, the terminal sends the preamble of the first SSB combination of the cell to the cell network side device;

[0264] Step 3: The network-side equipment in this cell receives the preamble of the first SSB combination from the terminal and sends a first downlink signal (e.g., on-demand SSB) associated with the first SSB combination.

[0265] For example, in an NTN scenario, satellite SSBs are periodically transmitted, while terrestrial cell SSBs are transmitted on-demand. The satellite equipment can send a first message to the UE, informing the UE of the SSBs and RO-preamble configuration information of all terrestrial cells within the satellite's coverage area. When the UE needs to access a terrestrial cell, it sends the preamble corresponding to the SSB combination of all SSBs in that cell, triggering the transmission of SSBs for that cell and thus enabling access to that cell.

[0266] In addition, the UE can also trigger the transmission of specific downlink signals (on demand SIB1 / SSB, etc.) from multiple TRP / network-side devices by sending a WUS signal (e.g., preamble).

[0267] In this implementation, the terminal can trigger the network side to send downlink signals associated with the SSB combination based on the WUS signal of the SSB combination, without having to send multiple signals for a single SSB, thus effectively improving the transmission performance between the terminal and the network side.

[0268] Please refer to Figure 4 , Figure 4 This is a flowchart of a random access method provided in an embodiment of this application. The method is applied to a network-side device, such as... Figure 4 As shown, the method includes the following steps:

[0269] Step 401: The network-side device sends a first message to the terminal. The first message is used to indicate the PRACH resource configuration information corresponding to the downlink signal combination. The PRACH resource configuration information is used to determine the preamble.

[0270] Step 402: The network-side device receives a second message sent by the terminal on the PRACH resource associated with the first downlink signal or the first downlink signal combination using the preamble, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any downlink signal combination.

[0271] Optionally, the first message further includes configuration information, which indicates at least one of the following:

[0272] Mapping relationship between downlink signals and PRACH resources;

[0273] Mapping relationship between downlink signal combinations and PRACH resources;

[0274] PRACH resource identifier.

[0275] Optionally, when the configuration information is used to indicate the mapping relationship between the downlink signal combination and PRACH resources, the first message is further used to indicate first information, which is used to determine the preamble corresponding to the first downlink signal combination;

[0276] The first information includes at least one of the following:

[0277] The number of downlink signal combinations;

[0278] The identifier of the downlink signal combination;

[0279] The preamble configuration corresponding to the downlink signal combination;

[0280] Random access type;

[0281] The function of the preamble.

[0282] Optionally, the network-side device indicates a preset rule to the terminal. The preset rule is used by the first RO resource pool to determine the first RO resource associated with the first downlink signal combination. The first RO resource is the RO resource associated with the first downlink signal combination.

[0283] Optionally, the preset rule includes a first rule, which indicates the mapping relationship between a first signal set and RO resources. The first signal set includes downlink signals and combinations of downlink signals, and the mapping relationship between the first signal set and RO resources is related to at least one of the following:

[0284] The index of the downlink signal;

[0285] The identifier of the downlink signal combination;

[0286] The number of downlink signals included in the downlink signal combination;

[0287] The index of the downlink signal in the downlink signal combination;

[0288] The order in which the downlink signals and the combinations of downlink signals are arranged.

[0289] Optionally, the preset rule includes a second rule, which indicates the mapping relationship between downlink signal combinations and RO resources. The mapping relationship between downlink signal combinations and RO resources is related to at least one of the following:

[0290] The identifier of the downlink signal combination;

[0291] The number of downlink signals included in the downlink signal combination;

[0292] The index of the downlink signal included in the downlink signal combination.

[0293] Optionally, when the configuration information is used to indicate the mapping relationship between the downlink signal and the PRACH resource, the first message further includes second information, the second information being used to determine the preamble associated with the first downlink signal combination on the first RO resource, wherein the first RO resource is an RO resource determined based on the mapping relationship between the first downlink signal and the PRACH resource;

[0294] The second information includes at least one of the following:

[0295] The identifier of the first downlink signal combination;

[0296] The downlink signals included in the first downlink signal combination;

[0297] The preamble configuration information corresponding to the first downlink signal combination;

[0298] The number of all downlink signal combinations including the first downlink signal;

[0299] An identifier for all downlink signal combinations including the first downlink signal;

[0300] The preamble mapping order of all downlink signal combinations including the first downlink signal on the first RO resource;

[0301] The preamble configuration information includes all downlink signal combinations corresponding to the first downlink signal;

[0302] Random access type;

[0303] The function of a preamble;

[0304] Alternatively, when the downlink signal combination is a feature, the second information includes at least one of the following:

[0305] Characteristic identifiers of downlink signal combinations;

[0306] The identifier of the first downlink signal combination;

[0307] The downlink signals included in the first downlink signal combination;

[0308] The preamble configuration information corresponding to the first downlink signal combination;

[0309] The index of the RO mask corresponding to the first downlink signal combination.

[0310] Optionally, the preamble configuration information includes at least one of the following:

[0311] Preamble start position;

[0312] Preamble index;

[0313] Number of preambles.

[0314] Optionally, the preamble mapping order is related to at least one of the following:

[0315] An identifier for a downlink signal combination that includes the first downlink signal;

[0316] The number of downlink signals included in the downlink signal combination that includes the first downlink signal;

[0317] An index containing the downlink signal combination of the first downlink signal.

[0318] 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:

[0319] Downlink signal combination identifier, downlink signal identifier in downlink signal combination, PRACH resource identifier, and PRACH mask index.

[0320] 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.

[0321] Optionally, the method further includes:

[0322] The network-side device sends a third message to the terminal, which is a response message to the second message.

[0323] 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.

[0324] 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.

[0325] The random access method provided in this application can be executed by a random access device. This application uses an example of a random access device executing the random access method to illustrate the random access device provided in this application.

[0326] This application provides a random access device. As an example, the random access device may be a communication device or a component within a communication device, such as a chip. The communication device may be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal may include, but is not limited to, the type of terminal 11 listed above, and the network-side device may include, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0327] The random access device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, such as a Central Processing Unit (CPU), microprocessor, Digital Signal Processor (DSP), Artificial Intelligence (AI) processor, Graphics Processing Unit (GPU), Application Specific Integrated Circuit (ASIC), or network processor.

[0328] (Network Processor, NP), Field Programmable Gate Array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving module and the transmitting module can be implemented by a communication interface, which may include one or more of the following: transceiver, pins, circuits, bus, radio frequency unit, etc.

[0329] For details, see Figure 5 When the random access device is a terminal or a component within a terminal, the random access device 500 includes:

[0330] The first receiving module 501 is used to receive the first message;

[0331] The processing module 502 is used to obtain 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;

[0332] The first transmitting module 503 is configured to transmit a second message using the preamble on a PRACH resource associated with a first downlink signal or a combination of first downlink signals, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0333] Optionally, the first message includes configuration information, and the processing module 502 is further configured to perform at least one of the following:

[0334] When the configuration information indicates the mapping relationship between the downlink signal combination and PRACH resources, a first RO resource pool is determined based on the configuration information, and a first RO resource associated with the first downlink signal combination is determined in the first RO resource pool according to a preset rule. The preamble corresponding to the first downlink signal combination is determined from the first RO resource according to the first information.

[0335] When the configuration information indicates the mapping relationship between downlink signals and PRACH resources, a first RO resource is determined based on the mapping relationship between the first downlink signals and PRACH resources, and a preamble associated with the first downlink signal combination on the first RO resource is determined according to the second information.

[0336] The first information and the second information are indicated through the first message.

[0337] Optionally, the preset rule includes a first rule, which indicates the mapping relationship between a first signal set and RO resources. The first signal set includes downlink signals and combinations of downlink signals, and the mapping relationship between the first signal set and RO resources is related to at least one of the following:

[0338] The index of the downlink signal;

[0339] The identifier of the downlink signal combination;

[0340] The number of downlink signals included in the downlink signal combination;

[0341] The index of the downlink signal in the downlink signal combination;

[0342] The order in which the downlink signals and the combinations of downlink signals are arranged.

[0343] Optionally, the preset rule includes a second rule, which indicates the mapping relationship between downlink signal combinations and RO resources. The mapping relationship between downlink signal combinations and RO resources is related to at least one of the following:

[0344] The identifier of the downlink signal combination;

[0345] The number of downlink signals included in the downlink signal combination;

[0346] The index of the downlink signal in the downlink signal combination.

[0347] Optionally, the first information includes at least one of the following:

[0348] The number of downlink signal combinations;

[0349] The identifier of the downlink signal combination;

[0350] The preamble configuration information corresponding to the downlink signal combination;

[0351] Random access type;

[0352] The function of the preamble.

[0353] Optionally, the second information includes at least one of the following:

[0354] The identifier of the first downlink signal combination;

[0355] The downlink signals included in the first downlink signal combination;

[0356] The preamble configuration information corresponding to the first downlink signal combination;

[0357] The number of all downlink signal combinations including the first downlink signal;

[0358] An identifier for all downlink signal combinations including the first downlink signal;

[0359] The preamble mapping order of all downlink signal combinations including the first downlink signal on the first RO resource;

[0360] The preamble configuration information includes all downlink signal combinations corresponding to the first downlink signal;

[0361] Random access type;

[0362] The function of the preamble.

[0363] Optionally, the preamble mapping order is related to at least one of the following:

[0364] An identifier for a downlink signal combination that includes the first downlink signal;

[0365] The number of downlink signals included in the downlink signal combination that includes the first downlink signal;

[0366] The index of the downlink signal in the downlink signal combination that includes the first downlink signal.

[0367] Optionally, when the downlink signal combination is a feature, the second information includes at least one of the following:

[0368] The characteristic identifier of the downlink signal combination;

[0369] The identifier of the first downlink signal combination;

[0370] The downlink signals included in the first downlink signal combination;

[0371] The preamble configuration information corresponding to the first downlink signal combination;

[0372] The index of the RO mask corresponding to the first downlink signal combination.

[0373] Optionally, the preamble configuration information includes at least one of the following:

[0374] Preamble start position;

[0375] Preamble index;

[0376] Number of preambles.

[0377] Optionally, if the configuration information includes a PRACH resource identifier, and the PRACH resource identifier is a specific identifier, the processing module 502 performs the first operation.

[0378] Optionally, when 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: downlink signal combination identifier, downlink signal identifier in the downlink signal combination, PRACH resource identifier, and index of the PRACH mask.

[0379] Optionally, when the RACH resource identifier is a numerical value, the RACH 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.

[0380] Optionally, if the PRACH resource identifier is not a specific identifier, the device selects the preamble resource corresponding to the PRACH resource identifier according to the configuration information.

[0381] Optionally, the processing module 502 is further configured to perform at least one of the following:

[0382] The preamble is determined based on the indication of the PRACH resource configuration information;

[0383] Select a preamble within the range indicated by the PRACH resource configuration information.

[0384] Optionally, where:

[0385] The first downlink signal combination is a combination of the N downlink signals with the best measurement results, where N is an integer greater than 1; and / or,

[0386] The measurement result of the downlink signal in the first downlink signal combination under the first measurement metric is greater than or equal to the preset threshold first measurement metric.

[0387] Optionally, the first receiving module 501 is further configured to:

[0388] Receive a third message sent by the network-side device, wherein the third message is a response message to the second message.

[0389] The random access device 500 provided in this application embodiment can achieve... Figure 2 The various processes implemented on the terminal in the method embodiment achieve the same technical effect, and will not be described again here to avoid repetition.

[0390] See Figure 6 When the random access device is a network-side device or a component of a network-side device, the random access device 600 includes:

[0391] The second sending module 601 is used to send a first message to the terminal. The first message is used to indicate the PRACH resource configuration information corresponding to the downlink signal combination. The PRACH resource configuration information is used to determine the preamble.

[0392] The second receiving module 602 is configured to receive a second message sent by the terminal on a PRACH resource associated with a first downlink signal or a combination of first downlink signals using the preamble, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0393] Optionally, the first message includes configuration information, which indicates at least one of the following:

[0394] Mapping relationship between downlink signals and PRACH resources;

[0395] Mapping relationship between downlink signal combinations and PRACH resources;

[0396] PRACH resource identifier.

[0397] Optionally, when the configuration information is used to indicate the mapping relationship between the downlink signal combination and PRACH resources, the first message is further used to indicate first information, which is used to determine the preamble corresponding to the first downlink signal combination;

[0398] The first information includes at least one of the following:

[0399] The number of downlink signal combinations;

[0400] The identifier of the downlink signal combination;

[0401] The preamble configuration information corresponding to the downlink signal combination;

[0402] Random access type;

[0403] The function of the preamble.

[0404] Optionally, the device 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 first RO resource pool associated with the first downlink signal combination.

[0405] Optionally, the preset rule includes a first rule, which indicates the mapping relationship between a first signal set and RO resources. The first signal set includes downlink signals and combinations of downlink signals, and the mapping relationship between the first signal set and RO resources is related to at least one of the following:

[0406] The index of the downlink signal;

[0407] The identifier of the downlink signal combination;

[0408] The number of downlink signals included in the downlink signal combination;

[0409] The index of the downlink signal in the downlink signal combination;

[0410] The order in which the downlink signals and the combinations of downlink signals are arranged.

[0411] Optionally, the preset rule includes a second rule, which indicates the mapping relationship between downlink signal combinations and RO resources. The mapping relationship between downlink signal combinations and RO resources is related to at least one of the following:

[0412] The identifier of the downlink signal combination;

[0413] The number of downlink signals included in the downlink signal combination;

[0414] The index of the downlink signal included in the downlink signal combination.

[0415] Optionally, when the configuration information is used to indicate the mapping relationship between the downlink signal and the PRACH resource, the first message further includes second information, the second information being used to determine the preamble associated with the first downlink signal combination on the first RO resource, wherein the first RO resource is an RO resource determined based on the mapping relationship between the first downlink signal and the PRACH resource;

[0416] The second information includes at least one of the following:

[0417] The identifier of the first downlink signal combination;

[0418] The downlink signals included in the first downlink signal combination;

[0419] The preamble configuration information corresponding to the first downlink signal combination;

[0420] The number of all downlink signal combinations including the first downlink signal;

[0421] An identifier for all downlink signal combinations including the first downlink signal;

[0422] The preamble mapping order of all downlink signal combinations including the first downlink signal on the first RO resource;

[0423] The preamble configuration information includes all downlink signal combinations corresponding to the first downlink signal;

[0424] Random access type;

[0425] The function of a preamble;

[0426] Alternatively, when the downlink signal combination is a feature, the second information includes at least one of the following:

[0427] Characteristic identifiers of downlink signal combinations;

[0428] The identifier of the first downlink signal combination;

[0429] The downlink signals included in the first downlink signal combination;

[0430] The preamble configuration information corresponding to the first downlink signal combination;

[0431] The index of the RO mask corresponding to the first downlink signal combination.

[0432] Optionally, the preamble configuration information includes at least one of the following:

[0433] Preamble start position;

[0434] Preamble index;

[0435] Number of preambles.

[0436] Optionally, the preamble mapping order is related to at least one of the following:

[0437] An identifier for a downlink signal combination that includes the first downlink signal;

[0438] The number of downlink signals included in the downlink signal combination that includes the first downlink signal;

[0439] An index containing the downlink signal combination of the first downlink signal.

[0440] 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:

[0441] Downlink signal combination identifier, downlink signal identifier in downlink signal combination, PRACH resource identifier, and PRACH mask index.

[0442] 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.

[0443] Optionally, the second sending module 601 is further configured to:

[0444] A third message is sent to the terminal, which is a response message to the second message.

[0445] The random access device 600 provided in this application embodiment can achieve Figure 4 The various processes implemented by the network-side device in the method embodiment achieve the same technical effect, and will not be described again here to avoid repetition.

[0446] like Figure 7 As shown in the illustration, this application also provides a communication device 700, including a processor 701 and a memory 702. The memory 702 stores programs or instructions that can run on the processor 701. For example, when the communication device 700 is a terminal, the program or instructions executed by the processor 701 implement the various steps of the above-described random access method embodiment and achieve the same technical effect. When the communication device 700 is a network-side device, the program or instructions executed by the processor 701 implement the various steps of the above-described random access method embodiment and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0447] This application embodiment also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement, for example... Figure 2 The steps in the method embodiment shown are illustrated. This terminal embodiment corresponds to the above-described terminal-side method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. The terminal can be... Figure 5 The random access device shown. Specifically, Figure 8 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0448] The terminal 800 includes, but is not limited to, at least some of the following components: radio frequency unit 801, network module 802, audio output unit 803, input unit 804, sensor 805, display unit 806, user input unit 807, interface unit 808, memory 809, and processor 810.

[0449] Those skilled in the art will understand that the terminal 800 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 810 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 8 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0450] It should be understood that, in this embodiment, the input unit 804 may include a graphics processor 8041 and a microphone 8042. The graphics processor 8041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 806 may include a display panel 8061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. 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 may include two parts: a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0451] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 801 can transmit it to the processor 810 for processing; in addition, the radio frequency unit 801 can send uplink data to the network-side device. Typically, the radio frequency unit 801 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0452] The memory 809 can be used to store software programs or instructions, as well as various data. The memory 809 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 809 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 809 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0453] Processor 810 may include one or more processing units; optionally, processor 810 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 810.

[0454] The radio frequency unit 801 is used to receive the first message;

[0455] The processor 810 is configured to obtain physical random access channel (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.

[0456] The radio frequency unit 801 is also configured to transmit a second message using the preamble on a PRACH resource associated with the first downlink signal or a combination of first downlink signals, wherein the first downlink signal combination includes the first downlink signal and the first downlink signal combination is any combination of downlink signals.

[0457] It should be noted that the terminal provided in this application embodiment is capable of achieving Figure 2 The entire process of the method embodiment described herein, and the same or corresponding technical effects achieved, will not be repeated here to avoid duplication.

[0458] This application embodiment also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement, for example... Figure 4 The steps of the method embodiment shown are illustrated. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0459] Specifically, embodiments of this application also provide a network-side device, which may be... Figure 6 The random access device shown. For example... Figure 9 As shown, the network-side device 900 includes: an antenna 91, a radio frequency (RF) device 92, a baseband device 93, a processor 94, and a memory 95. The antenna 91 is connected to the RF device 92. In the uplink direction, the RF device 92 receives information through the antenna 91 and transmits the received information to the baseband device 93 for processing. In the downlink direction, the baseband device 93 processes the information to be transmitted and sends it to the RF device 92. The RF device 92 processes the received information and transmits it through the antenna 91.

[0460] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 93, which includes a baseband processor.

[0461] Baseband device 93 may include, for example, at least one baseband board on which multiple chips are disposed, such as Figure 9 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 95 via a bus interface to call the program in the memory 95 and execute the network device operations shown in the above method embodiment.

[0462] The network-side device may also include a network interface 96, such as a Common Public Radio Interface (CPRI).

[0463] Specifically, the network-side device 900 in this application embodiment further includes: instructions or programs stored in memory 95 and executable on processor 94, wherein processor 94 calls the instructions or programs in memory 95 to execute. Figure 6 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0464] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described random access method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0465] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0466] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described random access method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0467] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0468] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described random access method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0469] This application also provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the random access method described above, and the network-side device can be used to perform the steps of the random access method described above.

[0470] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0471] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0472] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A random access method, characterized by, The method comprises: a terminal receiving a first message; the terminal obtaining physical random access channel (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; the terminal sending a second message by using the preamble on PRACH resource associated with a 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.

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, which comprises: the terminal performing a first operation, wherein the first operation comprises 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, 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 where the configuration information indicates a mapping relationship between a 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; wherein 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 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: an index of the downlink signal; an identifier of the downlink signal combination; a number of downlink signals contained 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.

4. The method of claim 2, 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, wherein the mapping relationship between the downlink signal combination and the RO resource is related to at least one of the following: an identifier of the downlink signal combination; a number of downlink signals contained in the downlink signal combination; an index of a downlink signal in the downlink signal combination.

5. The method according to any one of claims 2-4, characterized in that, The first information comprises at least one of the following: a number of downlink signal combinations; an identifier of the downlink signal combination; preamble configuration information corresponding to the downlink signal combination; a random access type; a function of a preamble.

6. The method of claim 2, wherein, The second information comprises at least one of the following: an identifier of the first downlink signal combination; a downlink signal contained in the first downlink signal combination; preamble configuration information corresponding to the first downlink signal combination; a number of all downlink signal combinations containing the first downlink signal; identifiers of all downlink signal combinations containing the first downlink signal; a preamble mapping order of all downlink signal combinations containing the first downlink signal on the first RO resource; preamble configuration information corresponding to all downlink signal combinations containing 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 identification of the downlink signal combination containing the first downlink signal; a number of downlink signals contained in the downlink signal combination containing the first downlink signal; an index of the downlink signal in the downlink signal combination containing 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 identification of the downlink signal combination; an identification 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 according to claim 7 or 8, characterized in that, 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 identification, the PRACH resource identification is a specific identification, and the terminal performs the first operation.

11. The method according to any one of claims 1-10, characterized in that, 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 identification, a downlink signal identification in the downlink signal combination, a PRACH resource identification, and an index of a PRACH mask.

12. The method of claim 11, wherein, In a case where the RACH resource identification is a numerical value, the PRACH resource identification 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 identification is not a specific identification, the terminal selects a preamble resource corresponding to the PRACH resource identification 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, Wherein: The first downlink signal combination is a downlink signal combination formed by N downlink signals with the best measurement results, N being an integer greater than 1; and / or 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.

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: Including: The network side device sends 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; 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; The random access type; The 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: The feature identification of the downlink signal combination; The identification of the first downlink signal combination; The downlink signal included in the first downlink signal combination; The preamble configuration information corresponding to the first downlink signal combination; The index of the 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: The preamble starting position; The preamble index; The number of preambles.

25. The method of claim 23, wherein, The preamble mapping order is related to at least one of the following: The identification of the downlink signal combination containing the first downlink signal; The number of downlink signals contained in the downlink signal combination containing the first downlink signal; The 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 the mapping relationship between the downlink signal and the PRACH resource, the configuration information further includes at least one of the following: The downlink signal combination identification, the downlink signal combination downlink signal identification, the PRACH resource identification, the PRACH mask index.

27. The method of claim 26, wherein, In the case where the PRACH resource identification is a numerical value, the PRACH resource identification 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 number.

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. An apparatus for random access, the apparatus comprising: Including: A first receiving module for receiving a first message; A processing module for obtaining downlink signal combination corresponding PRACH resource configuration information 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 the PRACH resource associated with the first downlink signal or the first downlink signal combination, wherein the first downlink signal combination includes the first downlink signal, and the first downlink signal combination is 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 the mapping relationship between the downlink signal combination and the PRACH resource, determine a first RO resource pool based on the configuration information, and determine a first RO resource associated with the first downlink signal combination in 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; In the case where the configuration information indicates the mapping relationship between the downlink signal and the PRACH resource, determine a first RO resource based on the mapping relationship between the first downlink signal and the PRACH resource, and determine the preamble associated with the first downlink signal combination on the first RO resource according to the second information; Wherein, 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 at least one of the following: Determine the preamble according to the indication of the PRACH resource configuration information; select a preamble within a preamble range 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. An apparatus for random access, the apparatus comprising: comprising: The 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 to determine a preamble. The second receiving module is 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: a mapping relationship between a downlink signal and a PRACH resource; a mapping relationship between a downlink signal combination and a PRACH resource; a 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, characterized by comprise 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 the steps of the random access method according to any one of claims 1-16.

37. A network-side device, comprising: comprise 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 the steps of the random access method according to any one of claims 17-28.

38. A readable storage medium characterized by, The readable storage medium stores programs or instructions, the programs or instructions being executed by the processor to implement the steps of the random access method according to any one of claims 1-16, or to implement the steps of the random access method according to any one of claims 17-28.

39. A computer program product, characterised in that, The computer program product is stored in a storage medium, the computer program product being executed by at least one processor to implement the steps of the random access method according to any one of claims 1-16, or to implement the steps of the random access method according to any one of claims 17-28.

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