Synchronization signal transmission method and apparatus, and device

Abstract

The present application belongs to the technical field of communications. Disclosed are a synchronization signal transmission method and apparatus, and a device. The synchronization signal transmission method in the embodiments of the present application comprises: a terminal receiving at least one of a first-type synchronization signal and a second-type synchronization signal, which are transmitted from a network-side device, wherein the first-type synchronization signal is a synchronization signal that is transmitted by means of a single transmit-receive point (TRP), the second-type synchronization signal is a synchronization signal that is transmitted by means of a TRP cluster, and the TRP cluster comprises at least two TRPs; and the terminal measuring the received synchronization signal, so as to obtain a measurement result of the synchronization signal. Since a terminal can receive two types of synchronization signals, which are a first-type synchronization signal that is transmitted by means of a single TRP and a second-type synchronization signal that is collaboratively transmitted by means of a TRP cluster, respectively, the terminal receives a plurality of types of synchronization signals, so that the reliability and success rate of the terminal accessing a network are increased.

Description

Synchronous signal transmission method, device and equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202311576299.0 and titled “A method, device and apparatus for transmitting a synchronization signal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a synchronization signal transmission method, device and equipment. Background Art

[0004] Cell-free massive MIMO (Multiple-Input Multiple-Output) systems eliminate the concept of cells and instead distribute a large number of antennas over a wide area, with terminals similarly distributed across this wide area. These antennas are called Transmit-Receive Points (TRPs) or Access Points (APs). In theory, each terminal can communicate with every AP. Cell-free massive MIMO networks are expected to be applied to next-generation indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping malls, stadiums, subways, hospitals, community centers, and university campuses.

[0005] However, the number or sending method of synchronization signal blocks (SSB) in the related art cannot meet the coverage requirements of the Cell-free network, resulting in low reliability and success rate of terminal access to the network. Summary of the Invention

[0006] The embodiments of the present application provide a synchronization signal transmission method, apparatus, and device, which can improve the reliability and success rate of terminal access to the network.

[0007] In a first aspect, a synchronization signal transmission method is provided, the method comprising:

[0008] The terminal receives at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network side device, where the first type of synchronization signal is a synchronization signal sent through a single transmission and reception point (TRP), and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, where the TRP cluster includes at least two TRPs.

[0009] The terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal.

[0010] In a second aspect, a synchronization signal transmission method is provided, the method comprising:

[0011] The network side device sends at least one of a first type of synchronization signal and a second type of synchronization signal, wherein the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

[0012] According to a third aspect, a synchronization signal transmission device is provided, the device comprising:

[0013] a first receiving module, configured to receive at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network-side device, wherein the first type of synchronization signal is a synchronization signal sent via a single transmission reception point (TRP), and the second type of synchronization signal is a synchronization signal sent via a TRP cluster, wherein the TRP cluster includes at least two TRPs;

[0014] The first measurement module is used to measure the received synchronization signal to obtain a measurement result of the synchronization signal.

[0015] In a fourth aspect, a synchronization signal transmission device is provided, the device comprising:

[0016] The first sending module is used to send at least one of a first type of synchronization signal and a second type of synchronization signal, wherein the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

[0017] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the synchronization signal transmission method as described in the first aspect are implemented.

[0018] In the sixth aspect, a network side device is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the synchronization signal transmission method as described in the second aspect are implemented.

[0019] In the seventh aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the synchronization signal transmission method described in the first aspect or the steps of the synchronization signal transmission method described in the second aspect are implemented.

[0020] In the eighth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the steps of the synchronization signal transmission method described in the first aspect, or the steps of the synchronization signal transmission method described in the second aspect.

[0021] In the ninth aspect, a computer program / program product is provided, which is stored in a storage medium and executed by at least one processor to implement the steps of the synchronization signal transmission method described in the first aspect, or the steps of the synchronization signal transmission method described in the second aspect.

[0022] In a tenth aspect, an electronic device is provided, wherein the electronic device is configured to execute the steps of the synchronization signal transmission method as described in the first aspect, or the steps of the synchronization signal transmission method as described in the second aspect.

[0023] In an embodiment of the present application, a terminal receives at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network-side device, where the first type of synchronization signal is a synchronization signal sent via a single TRP and the second type of synchronization signal is a synchronization signal sent via a TRP cluster. The terminal then measures the received synchronization signal to obtain a synchronization signal measurement result. Because the terminal can receive two types of synchronization signals, namely, the first type of synchronization signal sent via a single TRP and the second type of synchronization signal sent collaboratively via a TRP cluster, the terminal improves the reliability and success rate of network access by receiving multiple types of synchronization signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a block diagram of a wireless communication system to which embodiments of the present application may be applied;

[0025] FIG2 is a schematic diagram of an SSB beam scanning process based on a TDM method in an embodiment of the present application;

[0026] FIG3 is a flowchart of a synchronization signal transmission method according to an embodiment of the present application;

[0027] FIG4 is a schematic diagram of sending a synchronization signal in an embodiment of the present application;

[0028] FIG5 is a schematic diagram of a synchronization signal sent in a TDM manner in an embodiment of the present application;

[0029] FIG6 is a schematic diagram of another synchronization signal sent in a TDM manner in an embodiment of the present application;

[0030] FIG7 is a schematic diagram of another synchronization signal sent in a TDM manner in an embodiment of the present application;

[0031] FIG8 is a schematic diagram of a synchronization signal sent in an FDM manner in an embodiment of the present application;

[0032] FIG9 is a flowchart of another synchronization signal transmission method in an embodiment of the present application;

[0033] FIG10 is a schematic structural diagram of a synchronization signal transmission device according to an embodiment of the present application;

[0034] FIG11 is a schematic structural diagram of another synchronization signal transmission device in an embodiment of the present application;

[0035] FIG12 is a schematic structural diagram of a communication device in an embodiment of the present application;

[0036] FIG13 is a schematic structural diagram of a terminal in an embodiment of the present application;

[0037] FIG14 is a schematic structural diagram of a network-side device in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0039] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0040] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0041] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to applications other than NR system applications, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0042] FIG1 shows a block diagram of a wireless communication system applicable to embodiments of the present application. The wireless communication system includes a terminal device 11 and a network-side device 12 . The terminal device 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device (Wearable Device), a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines, or furniture, etc.), a game console, a personal computer (PC), an ATM or a self-service machine, and other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the specific type of the terminal device 11 is not limited in the embodiments of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (RAN), a radio access network function, or a radio access network unit. The access network device 12 may include a base station, a WLAN access point, or a WiFi node, etc. The base station may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home node B, a home evolved node B, a transmitting and receiving point (TRP), or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.The core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data storage (UDR), home user server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), application function ( It should be noted that in the embodiments of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0043] To facilitate understanding of the technical solutions provided by this application, the main technical concepts involved in the embodiments of this application are briefly described below.

[0044] Cell search and synchronization process in NR technology:

[0045] In 5G NR technology, the SSB includes the Primary Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS), and the Physical Broadcast Channel (PBCH). The SSB occupies four Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and 20 RBs in the frequency domain. SSBs are code-division multiplexed (CDM) between different cells, and the cells to which the SSBs belong are distinguished based on different physical cell IDs.

[0046] To achieve downlink synchronization, the terminal (User Equipment, UE) needs to obtain the frequency of the access carrier by searching for the SSB. Since the NR spectrum range is very wide, to reduce the complexity of the search, the terminal performs SSB searches according to a certain frequency interval specified by the protocol. This frequency interval is called the synchronization raster. The terminal detects the received power (SS-RSRP) of the synchronization signal on the corresponding frequency according to the synchronization raster and selects any SSB whose SS-RSRP is higher than the threshold value (rsrp-ThresholdSSB). By demodulating the primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH) signal in the selected SSB, the terminal completes cell selection and synchronizes with the base station, and then performs random access.

[0047] NR uses beam forming to increase the coverage distance of wireless signals. At the same time, since the coverage angle of each beam is limited, NR uses beam sweeping to cover the service range of the entire cell. A cell usually needs to send multiple SSBs to complete a beam scan so that the synchronization signal covers the service range of the entire cell. The SSBs required to complete a beam scan constitute an SSB burst set. As shown in Figure 2, within the same cell, NR uses time division multiplexing (TDM) to perform SSB beam scanning. The transmission time of each SSB burst set is within half a wireless frame (5ms), and the beam directions of SSB signals of different (time domain resources) in the same SSB burst set are different.

[0048] Two-step RACH and four-step RACH:

[0049] In related technologies, random access procedures can be divided into contention-based random access procedures and non-contention-based random access procedures. The random access procedure can be a four-step random access procedure (also called a Type-1 random access procedure) or a two-step random access procedure (also called a Type-2 random access procedure).

[0050] In the contention-based 4-step Random Access Channel (RACH) process, the UE first sends Msg1 to the network, containing a preamble. After the network detects the preamble, it sends Msg2 / RAR (Random Access Response) containing the preamble number detected by the network and the uplink radio resources allocated to the UE for sending 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, based on the resources indicated by the 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 contention resolution information matches the contention resolution information it sent in Msg3, completing the 4-step random access process. The network includes UL grant information in the RAR to indicate the PUSCH scheduling information for Msg3, and also contains information such as the RAPID (RACH preamble ID), TC-RNTI, and TA. If the network does not receive the Msg3 PUSCH, it can schedule the retransmission of the Msg3 Physical Uplink Shared Channel (PUSCH) in the TC-RNTI scrambled PDCCH.

[0051] During the contention-based random access process, different terminals randomly select preambles for transmission. This can lead to different terminals selecting the same preamble for transmission on the same time-frequency radio resource (RO resource), a situation considered a preamble conflict. In this case, different terminals will receive the same RAR. In this case, different terminals will transmit Msg3 PUSCH based on the scheduling information in the RAR UL grant. The network can only decode the PUSCH (including contention resolution information) sent by one terminal on a Msg3 PUSCH scheduling resource. Therefore, the network includes the contention resolution information received in Msg3 in Msg4. If the contention resolution information received in Msg4 matches the contention resolution information sent by the terminal in Msg3 PUSCH, the terminal considers contention resolution successful. If they do not match, contention resolution is unsuccessful. If contention resolution is unsuccessful, the terminal reselects a RACH transmission resource, transmits on the Physical Random Access Channel (PRACH), and makes the next random access attempt.

[0052] In NR Rel-16, the two-step random access procedure 2-step RACH was introduced. The first step is that the terminal sends Msg A to the network side. After receiving Msg A, the network side sends Msg B to the terminal. If the terminal does not receive Msg B within a certain period of time, the UE will increment the counter that counts the number of times Msg A is sent and resend Msg A. If the counter that counts the number of times Msg A is sent reaches a certain threshold, the terminal will switch from the 2-step random access procedure to the 4-step random access procedure. Msg A includes the Msg A preamble part and the Msg A PUSCH part. The preamble part is sent on the RO used for 2-step RACH, and the PUSCH part is sent on the Msg A PUSCH resources associated with the sending of the Msg A preamble and RO. MsgA PUSCH resources are a set of PUSCH resources configured relative to each PRACH slot, including time-frequency resources and demodulation reference signal (DMRS) resources.

[0053] Cell switching:

[0054] Cell handover refers to the process of a terminal switching from one cell to another. Cell handover includes L3-based cell handover and L1 / 2-based cell handover. Specifically, the process of L3-based cell handover is as follows:

[0055] Step 1: The terminal obtains the cell quality by measuring the RS (SSB and CSI-RS) of the current serving cell and neighboring cells, and reports it;

[0056] Step 2: The network side device determines whether cell switching is required based on the cell quality reported by the terminal side;

[0057] Step 3: If the network-side device determines that a cell handover is required, it sends a handover request command to the target cell; the target cell feeds back the RRC reconfiguration signaling to the serving cell;

[0058] Step 4: The serving cell sends the RRC configuration information of the target cell to the terminal. After receiving the configuration signaling of the target cell, the terminal performs RRC reconfiguration.

[0059] Step 5: The terminal decodes the DMRS and PBCH of the PBCH according to the first SSB of the target cell after RRC reconfiguration, obtains the system frame number, half-frame indicator and SSB index, performs downlink synchronization at the frame level, timeslot level and symbol level, and adjusts the automatic gain control (AGC) parameters according to the received power of the SSB.

[0060] Step 6: After downlink synchronization, the terminal performs uplink synchronization through RACH until it receives the random receive response (RAR) and obtains the TA. Uplink synchronization is completed;

[0061] Step 7: After the above steps are completed, the target cell sends a cell handover completion indication to the serving cell.

[0062] As can be seen from the above process, the terminal needs to continuously monitor the downlink reference signal of the neighboring cell to obtain the cell quality and report it to the base station to determine whether to switch. This makes the switching process time-consuming. To reduce the switching latency, the protocol further supports L1 / 2-based cell switching.

[0063] LTM (L1 / 2-triggered mobility) was introduced in R18. In LTM, the network side device CU configures candidate target cells for the terminal in advance. The network side device DU sends the LTM handover command to the terminal based on the L1 measurement results. The terminal switches to the target cell based on the handover command instruction and RRC pre-configuration. The specific process is as follows:

[0064] Step 1: The network side device CU pre-configures the L1 measurement reporting configuration and candidate cell configuration parameters to the terminal;

[0065] Step 2: After the L1 measurement result meets the conditions, the terminal performs L1 reporting;

[0066] Step 3: The network-side device DU notifies the terminal to switch via the L1 / 2 handover command (HO cmd);

[0067] Step 4: The terminal applies the pre-configured target cell configuration parameters and automatically switches to the target cell.

[0068] Cell measurement:

[0069] In the NR system, there is a concept of multiple beams, so it is necessary to measure the measurement quantities of multiple beams. Only the beam measurement quantities that exceed the threshold are used for the final measurement quantity calculation. For multi-beam cell reselection, including reselection from E-UTRA to NR, the cell channel measurement is derived from the SSB beam: if the SIB2 / SIB4 parameter nrofSS-BlocksToAverage is not configured, or the SIB2 / SIB4 parameter absThreshSS-BlocksConsolidation is not configured, or the highest beam measurement value is less than or equal to absThreshSS-BlocksConsolidation. The cell measurement value is considered to be the highest beam measurement value, and each beam measurement quantity is defined in 38.215. Otherwise, the cell measurement quantity is the linear average of the nrofSS-BlocksToAverage highest beam measurement quantity powers that are above the threshold absThreshSS-BlocksConsolidation.

[0070] In related technologies, in order to obtain distributed cooperative transmission, the terminal must first access the network and then, in the connected state, perform cooperative transmission on the service channel. It is impossible to obtain cooperative transmission gain in the transmission of Msg1 to Msg4 or Msg A and Msg B during the random access phase in the idle state. In addition, in a Cell-free network, as the range of the super cell becomes larger and the number of TRPs included becomes denser, the number of synchronization signals needs to increase. The synchronization signal within the super cell is sent separately by a single TRP (per-TRP) using TDM. Due to the synchronization cycle, the maximum number of synchronization signals is limited, especially in the medium and high frequencies, which may cause coverage problems or greater interference within the same cell. In addition, the range of each super cell in the Cell-free network is large, and the terminal needs to frequently measure the synchronization signals of adjacent cells in order to perform random access or cell switching based on the measurement results.

[0071] Therefore, an embodiment of the present application provides a synchronization signal transmission method, in which a terminal receives at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network side device, the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster; and then the received synchronization signal is measured to obtain a measurement result of the synchronization signal. Since the terminal can receive two types of synchronization signals, namely, the first type of synchronization signal sent by a single TRP and the second type of synchronization signal sent collaboratively by the TRP cluster, the terminal improves the reliability and success rate of the terminal's access to the network by receiving multiple types of synchronization signals. In addition, it can be understood that the second type of synchronization signal is sent through a TRP cluster, so the second type of synchronization signal has better coverage performance and signal strength.

[0072] Furthermore, the terminal receives at least one of the first type of synchronization signal and the second type of synchronization signal in both the connected state and the idle state, thereby enabling the present application to obtain cooperative gain during transmission during the random access phase of the idle state. In one embodiment, whether to perform neighboring cell synchronization signal measurement is determined based on the location of the terminal, thereby reducing the terminal measurement behavior and complexity associated with connected cell handover or idle cell measurement in a cell-free network.

[0073] The synchronization signal transmission method provided in the embodiment of the present application is described in detail below through some embodiments and their application scenarios in combination with the accompanying drawings.

[0074] In a first aspect of an embodiment of the present application, a synchronization signal transmission method is provided. The method is applied to a terminal. FIG3 is a flowchart of an implementation of a synchronization signal transmission method provided in an embodiment of the present application. The method may include the following steps:

[0075] Step S310: The terminal receives at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network-side device, where the first type of synchronization signal is a synchronization signal sent through a single transmission reception point (TRP), and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, where the TRP cluster includes at least two TRPs.

[0076] Step S320: The terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal.

[0077] In the embodiment of the present application, the terminal may be the terminal device 11 in Figure 1, and the network side device may be the access network device or core network device in Figure 1. For examples of the terminal device 11 and the network side device 12, please refer to the above text and will not be repeated here.

[0078] In specific implementations, network-side devices can send synchronization signals through a single TRP or through the collaborative transmission of synchronization signals by multiple TRPs (i.e., a TRP cluster). As shown in Figure 4, synchronization signals 1, 2, 4, and 5 are all sent by a single TRP (TRP1 or TRP2) and belong to the first type of synchronization signals. Synchronization signal 3 is sent by the collaborative transmission of TRP1 and TRP2 and belongs to the second type of synchronization signal.

[0079] After receiving the synchronization signal, the terminal performs measurement to obtain the measurement result of the synchronization signal. The measurement result of the synchronization signal can reflect the communication quality of the synchronization signal. Specifically, the measurement result of the synchronization signal may include at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal to Interference Noise Ratio (SINR), Signal to Noise Ratio (SNR), Signal to Interference Ratio (SIR), and path loss. Since the terminal can receive two types of synchronization signals, namely the first type of synchronization signal sent by a single TRP and the second type of synchronization signal sent collaboratively by a TRP cluster, the terminal improves the reliability and success rate of the terminal's access to the network by receiving multiple types of synchronization signals.

[0080] In addition, since the second type of synchronization signal is sent through the TRP cluster, the second type of synchronization signal has better coverage performance and signal strength. In this way, the terminal receives multiple types of synchronization signals and obtains corresponding measurement results. That is, the terminal can obtain the collaborative gain of multiple TRPs during transmission in the initial access phase, which also improves the reliability and success rate of the terminal accessing the network.

[0081] In an optional embodiment, the synchronization signal received by the terminal includes a first type synchronization signal and a second type synchronization signal. In order to distinguish the types of the synchronization signals, the terminal further performs the following steps S330 and S340:

[0082] Step S330: The terminal receives first configuration information sent by the network-side device;

[0083] Step S340: Determine the type of the received synchronization signal according to the first configuration information.

[0084] The first configuration information includes: at least one of detection threshold indication information and a sending rule, wherein the detection threshold indication information is used to indicate the detection threshold of each of the first type synchronization signal and the second type synchronization signal, and the sending rule includes the sending rule of each of the first type synchronization signal and the second type synchronization signal;

[0085] The sending rules of the first type synchronization signal and the second type synchronization signal respectively include at least one of the following:

[0086] a transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM);

[0087] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal;

[0088] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0089] the number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal;

[0090] The sending order of the first type of synchronization signal and the second type of synchronization signal respectively;

[0091] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0092] frequency domain positions of the first type of synchronization signal and the second type of synchronization signal;

[0093] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0094] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0095] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0096] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0097] A time domain offset between the transmission start time of the first type synchronization signal and the second type synchronization signal;

[0098] A frequency domain offset between respective frequency domain starting positions of the first type synchronization signal and the second type synchronization signal;

[0099] A quasi-co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0100] In an embodiment of the present application, the first type of synchronization signal is sent through a single TRP, and the second type of synchronization signal is sent through a TRP cluster. Detection thresholds can be configured for the first type of synchronization signal and the second type of synchronization signal, respectively, wherein synchronization signals configured with the same detection threshold are synchronization signals of the same type. Furthermore, the type of the received synchronization signal is determined by the respective detection thresholds of the first type of synchronization signal and the second type of synchronization signal. In specific implementation, respective detection thresholds can be configured for the first type of synchronization signal and the second type of synchronization signal in the first configuration information. For example, a first detection threshold threshold1 = X is configured for the first type of synchronization signal, and a second detection threshold threshold2 = Y is configured for the second type of synchronization signal. The first detection threshold and the second detection threshold can be the same or different. Furthermore, a first detection threshold can be configured for the first type of synchronization signal in the first configuration information, and an offset compared to the first detection threshold can be indicated. For example, if the offset of the detection threshold indicated is 3 dB, it means that the second detection threshold is 3 dB higher than the first detection threshold.

[0101] The first type of synchronization signal and the second type of synchronization signal are sent by the network side device according to the sending rules, and then the type of the received synchronization signal can be determined according to the respective sending rules of the first type of synchronization signal and the second type of synchronization signal. Specifically, the first type of synchronization signal and the second type of synchronization signal can be sent through three methods: CDM, TDM, and frequency division multiplexing (FDM). In the CDM method, the identifiers of the first type of synchronization signal and the second type of synchronization signal (such as the synchronization signal ID and sequence) are different; in the TDM method, the time domain resources used to send the first type of synchronization signal and the second type of synchronization signal are different or the synchronization raster is different; in the FDM method, the frequency domain resources used to send the first type of synchronization signal and the second type of synchronization signal are different or the synchronization raster is different.

[0102] (1) When the first type of synchronization signal and the second type of synchronization signal are sent in CDM mode, the CDM sending rules are indicated by the network side or predefined by the protocol. The sending rules include information such as the generation rules or association relationship of the CDM mode and the synchronization signal identifier, the ID calculation method or configuration rules. For example, the second type of synchronization signal sequence can be obtained by performing a fixed cyclic shift on the first type of synchronization signal sequence; or, the second type of synchronization signal ID and the first type of synchronization signal ID range are different (for example, the second type of synchronization signal ID is 9 to 16, and the first type of synchronization signal ID is 1 to 8).

[0103] Specifically, the IDs of the first-type synchronization signal and the second-type synchronization signal can be defined uniformly or separately. In one example, the uniform definition means that the IDs of the first-type synchronization signal and the second-type synchronization signal are defined as 1 to 16, where 1 to 8 are the first-type synchronization signal IDs and 9 to 16 are the second-type synchronization signal IDs; the separate definition means that the IDs of the first-type synchronization signal are 1-1 to 1-8, and the IDs of the second-type synchronization signal are 2-1 to 2-8.

[0104] (2) When the first type of synchronization signal and the second type of synchronization signal are sent in TDM mode, the TDM sending rules are indicated by the network side or predefined by the protocol. The sending rules include the sending mode of each type of synchronization signal (such as TDM), the number of the first type of synchronization signal and the second type of synchronization signal, the sending order, the time domain position, the time domain range, the sending interval, the time domain offset (offset) of the start time of the two types of synchronization signals, the Quasi Co-located (QCL) relationship and other information. For example, as shown in Figure 5, with 16 synchronization signals as a sending cycle, the first 8 synchronization signals are the first type of synchronization signals, which are sent separately by each TRP in TDM mode, and the adjacent synchronization signal sending interval is δ1; the last 8 synchronization signals are the second type of synchronization signals, which are sent by multiple TRPs in TDM mode, and the adjacent synchronization signal sending interval is δ2 (δ2 can be the same as δ1, or configured separately); the time domain offset offset between the start time of the first type of synchronization signal and the second type of synchronization signal is Δ t .

[0105] In a specific implementation, if the first type of synchronization signal and the second type of synchronization signal are separated in time domain position, the frequency domain positions may completely overlap, partially overlap, or not overlap at all. As shown in Figure 6, the first type of synchronization signal and the second type of synchronization signal are separated in time domain position; wherein, the frequency domain position of the second type of synchronization signal A completely overlaps with the frequency domain position of the first type of synchronization signal, the frequency domain position of the second type of synchronization signal B and the second type of synchronization signal C partially overlaps with the frequency domain position of the first type of synchronization signal, and the frequency domain position of the second type of synchronization signal D does not overlap with the frequency domain position of the first type of synchronization signal. Moreover, within their respective time domain positions, the first type of synchronization signal and the second type of synchronization signal can be sent in TDM, FDM, or CDM mode. As shown in Figure 7, the first type of synchronization signal and the second type of synchronization signal are separated in time domain position, and the first type of synchronization signal and the second type of synchronization signal each use FDM mode to send synchronization signals within their respective time domain positions.

[0106] (3) When the first type of synchronization signal and the second type of synchronization signal are sent in FDM mode, the FDM sending rules are indicated by the network side or predefined by the protocol. The sending rules include the sending mode (such as FDM) of each type of synchronization signal, the number of the first type of synchronization signal and the second type of synchronization signal, the frequency domain position, the frequency domain range, the frequency domain interval, the frequency domain offset (offset) of the frequency domain starting position of the two types of synchronization signals, the time domain offset, the quasi-co-location relationship, and other information.

[0107] In a specific implementation, if the two types of synchronization signals are separated in the frequency domain, their time domain positions may completely overlap, partially overlap, or not overlap at all. As shown in Figure 8, the first type of synchronization signal and the second type of synchronization signal are separated in the frequency domain; wherein the time domain position of the second type of synchronization signal A completely overlaps with the time domain position of the first type of synchronization signal, the time domain position of the second type of synchronization signal B and the second type of synchronization signal C partially overlaps with the time domain position of the first type of synchronization signal, and the time domain position of the second type of synchronization signal D does not overlap with the time domain position of the first type of synchronization signal. Furthermore, within their respective time domain positions, the same type of synchronization signal can be transmitted using TDM, FDM, or CDM.

[0108] In an optional embodiment, after obtaining the measurement result of the synchronization signal, the terminal performs step S350:

[0109] Step S350: The terminal selects one or more synchronization signals to initiate random access PRACH according to the measurement result of the synchronization signal.

[0110] In an embodiment of the present application, the measurement result of the synchronization signal can reflect the communication quality of the synchronization signal. Therefore, based on the measurement result of the synchronization signal, one or more synchronization signals are selected from the received synchronization signals to initiate random access. Specifically, the synchronization signals received by the terminal include two types. The type of the synchronization signal can be transparent to the terminal (that is, the terminal can distinguish the type of the received synchronization signal) or not transparent to the terminal (that is, the terminal does not distinguish the type of the received synchronization signal). If the terminal does not distinguish the type of the received synchronization signal, then based on the measurement result, a synchronization signal is selected from the received synchronization signals for random access. If the terminal can distinguish the type of the received synchronization signal, then based on the measurement result of the synchronization signal and in combination with the selection information associated with the synchronization signal type (for example, the priority of the synchronization signal type), one or more synchronization signals are selected to initiate random access.

[0111] It is understandable that the random access process is different when the terminal can distinguish the type of synchronization signal and when it cannot distinguish the type of synchronization signal. Specifically, the random access process when the terminal does not distinguish the type of synchronization signal is described in the first embodiment below. For the case where the terminal distinguishes the type of synchronization signal, considering that a TRP can not only send the first type of synchronization signal alone, but also cooperate with other TRPs to send the second type of synchronization signal, in order to ensure that the network side device can identify which synchronization signal the terminal is based on to initiate random access, the terminal cannot simultaneously initiate PRACH in the RO and preamble corresponding to the first type of synchronization signal and the second type of synchronization signal sent by the same TRP. Therefore, the random access when the terminal distinguishes the type of synchronization signal can be divided into three cases: selecting a synchronization signal to initiate random access, selecting multiple synchronization signals of the same type to initiate random access, and multiple different types of synchronization signals to initiate random access; specifically, the following embodiment 2 will respectively explain the process of selecting a synchronization signal to initiate random access, the embodiment 3 will explain the process of selecting multiple synchronization signals of the same type to initiate random access, and the embodiments 4 and 5 will explain the process of initiating random access by multiple different types of synchronization signals.

[0112] In an optional embodiment, to ensure that the random access process can be successfully completed, the terminal further performs the following steps:

[0113] Step S360: The terminal receives third configuration information sent by the network-side device, where the third configuration information is used to represent at least one of the following items of each of the first type of synchronization signal and the second type of synchronization signal:

[0114] Item C-1: RO and preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal;

[0115] Item C-2: Priority, used to indicate the priority of the synchronization signal type for random access;

[0116] Item C-3: The first condition is used to indicate the condition that the terminal selects a synchronization signal type with a lower priority to initiate random access, and the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

[0117] In an embodiment of the present application, the terminal receives the third configuration information sent by the network side device to select one or more synchronization signals to initiate random access PRACH according to the third configuration information, as well as the respective RO and preamble of each synchronization signal, thereby reducing access conflicts to avoid random access failure due to access conflicts.

[0118] Specifically, for item C-1, the RO of the synchronization signal refers to the time-frequency wireless resource used when the terminal initiates random access PRACH; the preamble is included in Msg 1 or Msg A, and is used by the network-side device to reply with corresponding response information after Msg 1 or Msg A detects the preamble. Different synchronization signals have different ROs and preambles. In specific implementation, after selecting the synchronization signal, the terminal determines the RO and preamble corresponding to the synchronization signal according to the third configuration information, and initiates random access PRACH according to the corresponding RO and preamble. In the following embodiments one to five, the RO and preamble of each selected one or more synchronization signals can be determined based on the RO and preamble corresponding to each synchronization signal belonging to the first type of synchronization signal or the second type of synchronization signal represented in the third configuration information.

[0119] For item C-2, after receiving multiple synchronization signals and obtaining the measurement results of each synchronization signal, the terminal selects one or more synchronization signals to initiate random access PRACH based on the priority of the synchronization signal type for random access. For example, if the priority of the first type of synchronization signal is higher than the priority of the second type of synchronization signal, then when the measurement results of the first type of synchronization signal and the measurement results of the second type of synchronization signal both meet their respective detection thresholds, the terminal gives priority to the first type of synchronization signal whose measurement results meet the detection threshold. Therefore, by configuring the priority of the synchronization signal type for random access, it is possible to avoid excessively concentrated access requests leading to reduced access reliability, which is beneficial to load balancing between different synchronization signal resources. In the following embodiments 2 to 5, one or more synchronization signals can be selected to initiate random access PRACH based on this priority.

[0120] For item C-3, the first condition indicates the condition under which the terminal selects a lower-priority synchronization signal type for random access. For example, if the first condition is that the measurement result of a high-priority synchronization signal does not meet the detection threshold, then the lower-priority synchronization signal type is selected for random access. In Embodiments 2 to 5 below, one or more synchronization signals may be selected to initiate random access (PRACH) based on this first condition.

[0121] In an optional embodiment, the terminal further performs the following steps:

[0122] The terminal receives first indication information sent by the network side device, and the first indication information is used to: indicate the adjusted detection threshold of the first type of synchronization signal or the second type of synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type of synchronization signal or the second type of synchronization signal.

[0123] In an embodiment of the present application, a network-side device can dynamically indicate or adjust the detection threshold for a certain type of synchronization signal. For example, when most terminals select the second type of synchronization signal for access, the network can increase the detection threshold for the second type of synchronization signal and indicate this to the terminal via first indication information. The terminal then selects one or more synchronization signals based on the adjusted detection threshold to initiate random access. Therefore, by adjusting the detection threshold, the terminal's access behavior can be adjusted, resource overhead can be reduced, and access reliability can be reduced due to overly concentrated access requests, thereby facilitating load balancing between different synchronization signal resources.

[0124] In combination with the first configuration information, the third configuration information and the first indication information, a method for the terminal to select one or more synchronization signals is described, specifically, including two cases: the terminal distinguishes whether to distinguish the type of synchronization signal; and the terminal does not distinguish whether to distinguish the type of synchronization signal.

[0125] (1) In the case where the terminal does not distinguish the type of synchronization signal, since the terminal does not distinguish the type of synchronization signal, it is equivalent to selecting all synchronization signals as synchronization signals of the same type. Therefore, the terminal selects one or more synchronization signals in two specific ways. Method 1: According to the detection threshold configured in the first configuration information, one or more synchronization signals are selected to initiate random access. For example, if the detection threshold is configured to be X, one or more synchronization signals whose measurement results of the synchronization signals are greater than the detection threshold X are selected to initiate random access. Method 2: Sort the detection results of the synchronization signals and select the first M (M is greater than or equal to 1) synchronization signals with the largest detection results to initiate random access.

[0126] (2) When the terminal distinguishes the type of synchronization signal, since the second type of synchronization signal is sent through the TRP cluster, although the second type of synchronization signal has better coverage performance and signal strength, it needs to occupy multiple TRPs and occupies more resources. If the terminal selects the synchronization signal only based on the synchronization signal measurement results, the terminal may concentrate on accessing the synchronization signal sent by the TRP cluster collaboration, resulting in higher overhead, and the access reliability and success rate may also be reduced due to concentrated access. Therefore, by distinguishing the two types of synchronization signals, combining the measurement results of the synchronization signal and the selection information associated with the synchronization signal type to select one or more synchronization signals to initiate random access, so as to achieve the reduction of resource overhead and access conflicts by adjusting the terminal's access behavior. Specifically, when the terminal distinguishes the type of synchronization signal, the terminal selects one or more synchronization signals in three specific ways.

[0127] Method 1: Based on the detection threshold configured in the first configuration information, one or more synchronization signals are selected to initiate random access. For example, if the first detection threshold of a first-type synchronization signal is X and the second detection threshold of a second-type synchronization signal is Y, first-type synchronization signals greater than the first detection threshold X and second-type synchronization signals greater than the second detection threshold Y are selected to initiate random access. For another example, if the indicated first detection threshold is X and the offset of the first detection threshold is A, first-type synchronization signals greater than the first detection threshold X and second-type synchronization signals greater than the second detection threshold (X + A) are selected to initiate random access.

[0128] Method 2: One or more synchronization signals are selected based on the first indication information to initiate random access. For example, when most terminals select the second type of synchronization signal for access, the network-side device can increase the detection threshold for the second type of synchronization signal and indicate this to the terminal. The terminal then selects one or more synchronization signals based on the adjusted detection threshold to initiate random access.

[0129] Mode 3: One or more synchronization signals are selected for random access based on the priority of the synchronization signal type configured in the third configuration or the first condition. For example, if the priority of the first type of synchronization signal is higher than that of the second type of synchronization signal, and if the measurement results of the first type of synchronization signal and the second type of synchronization signal both meet their respective detection thresholds, the terminal prioritizes the first type of synchronization signal whose measurement results meet the detection threshold.

[0130] In an optional embodiment, after obtaining the measurement result of the synchronization signal, the terminal performs the following steps S370 to S390:

[0131] Step S370: The terminal receives second indication information sent by the network-side device, where the second indication information is associated with the synchronization signal selected by the terminal, or is associated with the type of the synchronization signal selected by the terminal;

[0132] Step S380: The terminal determines random access information according to the second indication information;

[0133] Step S390: The terminal selects one or more synchronization signals according to the measurement result of the synchronization signal, and initiates a random access PRACH according to the random access information;

[0134] The random access information includes at least one of the following:

[0135] Item D-1: Random access method, where the random access method is two-step random access or four-step random access;

[0136] Item D-2: Priority of random access method;

[0137] Item D-3: Indication of disabling of random access method.

[0138] In an embodiment of the present application, the random access process can be a four-step random access process or a two-step random access process. The network side device can indicate random access information for different types of synchronization signals or for different synchronization signals through the first indication information, and then the terminal initiates random access PRACH according to the random access information. It can then be determined whether it is a two-step random access or a four-step random access based on the synchronization signal type or the synchronization signal, which helps to improve the success rate and efficiency of random access and shorten the access delay and signaling overhead. For example, the second type of synchronization signal sent by the TRP cluster collaboration has better performance and a relatively high success rate of two-step random access, which can indicate that two-step random access is given priority.

[0139] Specifically, for the D-1 random access method, the network side device may indicate the corresponding random access method for a certain type of synchronization signal, or may indicate the corresponding random access method for a single synchronization signal. For example, when the terminal selects the first type of synchronization signal to initiate random access PRACH, the network side device may indicate in the first indication information (such as the system message associated with the first type of synchronization signal) that the terminal accesses through a four-step random access method; or, when the terminal selects the second type of synchronization signal to initiate random access PRACH, the network side device may indicate in the first indication information (such as the system message associated with the second type of synchronization signal) that the terminal accesses through a two-step random access method. For another example, when the terminal selects synchronization signal #1 to initiate initial access, the network side device may indicate in the first indication information that the terminal accesses through a four-step random access method on synchronization signal #1.

[0140] With respect to the priority of random access methods D-2, the network device may indicate the priority or ranking of random access types for a certain type of synchronization signal or a single synchronization signal. For example, when a terminal selects a second type of synchronization signal to initiate random access PRACH, the network device may indicate in the first indication information (such as a system message associated with the second type of synchronization signal) that the terminal prioritizes access via two-step random access.

[0141] For the indication of prohibition of random access methods in item D-3, the network side may indicate the prohibited random access type for a certain type of synchronization signal or a single synchronization signal. For example, when the terminal selects the first type of synchronization signal to initiate random access PRACH, the network side device may instruct the terminal not to access through the two-step random access method in the first indication information (such as the system message associated with the first type of synchronization signal).

[0142] In an optional embodiment, to obtain the cell measurement value, the terminal performs the following steps:

[0143] The terminal receives a second condition sent by the network side device, where the second condition is used as a synchronization signal selection threshold for calculating a cell measurement amount;

[0144] The terminal calculates the cell measurement amount using the first type of synchronization signal or the second type of synchronization signal that meets the second condition.

[0145] In an embodiment of the present application, the second condition is used as a synchronization signal selection threshold for calculating the cell measurement quantity, for example, a reference signal received power (RSRP) selection threshold. A cell includes multiple synchronization signals, so when calculating the cell measurement quantity, it is necessary to select a synchronization signal that meets the second condition, so as to linearly average the measurement results of the synchronization signals that meet the second condition to obtain the cell measurement quantity. For example, the second condition selects a threshold value H, and a synchronization signal whose measurement result is greater than the selection threshold value H is determined to be a synchronization signal that meets the second condition. When distinguishing the types of synchronization signals, different second conditions can be configured for the first type of synchronization signal and the second type of synchronization signal, respectively. For example, the second condition of the first type of synchronization signal is defined as threshold 1, and the second condition of the second type of synchronization signal is defined as threshold 2. Then, the measurement results of the first type of synchronization signal are filtered using threshold 1, and the measurement results of the second type of synchronization signal are filtered using threshold 2, and finally, the cell measurement quantity is calculated based on the filtered synchronization signals.

[0146] Based on the calculation method of the cell measurement amount implemented in this application, the terminal performs neighboring cell synchronization signal measurement according to the resident position in the idle state, which specifically corresponds to the sixth implementation method below; the terminal performs neighboring cell synchronization signal measurement in the connected state, and determines whether to perform inter-cell switching based on the measurement result of the neighboring cell synchronization signal, which specifically corresponds to the seventh implementation method below.

[0147] Next, the synchronization signal transmission method proposed in the above embodiment is described through the following implementation method.

[0148] Implementation Method 1

[0149] This embodiment describes how a terminal selects one or more synchronization signals to initiate a random access PRACH based on the synchronization signal measurement results without distinguishing the synchronization signal types. Specifically, it includes steps A1 to A3:

[0150] Step A1: The terminal determines the PRACH transmit power corresponding to each of the selected one or more synchronization signals;

[0151] Step A2: The terminal determines the PRACH transmission opportunity RO and preamble corresponding to each of the selected one or more synchronization signals;

[0152] Step A3: The terminal initiates PRACH using the determined RO and preamble according to the determined PRACH transmit power.

[0153] In the embodiment of the present application, the PRACH transmit power refers to the transmit power of Msg 1 or Msg A sent by the terminal when initiating PRACH. Since the terminal does not distinguish the type of synchronization signal, in step A1, the PRACH transmit power corresponding to each synchronization signal is determined using the same calculation method for the selected one or more synchronization signals. That is, regardless of whether it is a first-type synchronization signal or a second-type synchronization signal, the PRACH transmit power is determined using the same calculation method.

[0154] Each synchronization signal has a corresponding RO and preamble. The RO and preamble corresponding to the synchronization signal are configured by the network device through configuration information or agreed upon by the protocol. In one embodiment, when the RO and preamble corresponding to the synchronization signal are configured by the network device, the network device sends the third configuration information to the terminal. After receiving the third configuration information, the terminal determines the RO and preamble of each of the selected multiple synchronization signals based on the third configuration information.

[0155] In specific implementation, the terminal may initiate random access PRACH by four-step random access or two-step random access. (1) The process of four-step random access is as follows: after the terminal sends Msg 1 according to the selected N (N is greater than or equal to 1) synchronization signals, it opens the RAR listening window and uses the synchronization signal number #i (i is one of the N synchronization signals) as the quasi-co-location reference to perform Msg 2 / RAR listening; if the terminal successfully receives Msg 2 with synchronization signal #i and passes the verification, it sends Msg 3 according to the transmission space parameters corresponding to the synchronization signal #i reception space parameters. If the terminal successfully receives Msg 2 with multiple synchronization signals and passes the verification, it selects any one of the Msg 2 to respond and sends Msg 3; if the listening windows of multiple Msg 1s all time out, it is considered that the Msg 1 transmission has failed and Msg 1 transmission is re-executed. (2) The two-step random access process is as follows: after the terminal sends Msg A according to the selected N synchronization signals, it opens the RAR listening window and performs Msg B / RAR listening based on the synchronization signal number #i as the co-location reference; if the listening windows of multiple Msg Bs all time out, it is considered that Msg A transmission has failed and Msg A transmission is executed again.

[0156] Optionally, the terminal determines the PRACH transmit power through the following steps B1 and B2:

[0157] Step B1: The terminal receives second configuration information sent by the network side device; wherein the second configuration information is used to represent the PRACH transmit power offset;

[0158] Step B2: The terminal determines the PRACH transmit power according to the second configuration information. The PRACH transmit power is calculated according to the following equation: PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0159] Among them, P CMAX,f,c (i) is the maximum transmission power configured for the UE on carrier f in the serving cell C within the transmission opportunity RO i; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c is the path loss of the activated UL BWP b of carrier f obtained based on the DL RS associated with the PRACH transmission on the activated DL BWP of serving cell C, and offset represents the PRACH transmit power offset. b,f,c It is calculated based on the transmission power of the synchronization signal and the detection result. The PL of different synchronization signals b,f,c May be different.

[0160] In the embodiment of the present application, the terminal does not distinguish between the types of synchronization signals, and the PRACH transmit power of all synchronization signals is calculated using the same calculation method. Therefore, the PRACH transmit power offset refers to the PRACH transmit power offset of all synchronization signals, that is, the PRACH transmit power of all synchronization signals is calculated based on the same PRACH transmit power offset.

[0161] Implementation Method 2

[0162] This embodiment describes how a terminal selects a synchronization signal to initiate a random access PRACH after distinguishing the types of synchronization signals, including steps C1 to C3:

[0163] Step C1: When the terminal selects a synchronization signal according to the synchronization signal measurement result to initiate a PRACH, the terminal determines the type of the selected synchronization signal and determines the PRACH transmit power;

[0164] Step C2: The terminal determines the RO and preamble corresponding to the selected synchronization signal;

[0165] Step C3: The terminal initiates PRACH using the determined RO and preamble according to the determined PRACH transmit power.

[0166] In an embodiment of the present application, the PRACH transmission power of different types of synchronization signals is determined in different ways. Therefore, the PRACH transmission power of the type of synchronization signal is determined according to the PRACH transmission power calculation method corresponding to the synchronization signal type. Each synchronization signal corresponds to a corresponding RO and preamble, and the synchronization signal corresponding RO and preamble are configured by the network side device through configuration information or protocol agreement. In one embodiment, when the synchronization signal corresponding RO and preamble are configured by the network side device, the network side device sends a third configuration information to the terminal, and after receiving the third configuration information, the terminal determines the RO and preamble of each of the selected multiple synchronization signals according to the third configuration information. Among them, the terminal uses the determined RO and preamble to initiate PRACH, which can be a four-step random access or a two-step random access.

[0167] Optionally, when the terminal distinguishes the type of synchronization signal, the terminal determines the PRACH transmit power through the following steps D1 and D2:

[0168] Step D1: The terminal receives fourth configuration information sent by the network side device, wherein the fourth configuration information is used to represent the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

[0169] Step D2: The terminal determines the PRACH transmit power according to the fourth configuration information and the synchronization signal type. The PRACH transmit power is calculated according to the following equation: PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c}

[0170] Among them, P CMAX,f,c (i) is the maximum transmission power configured for the UE on carrier f of serving cell C within transmission opportunity RO i; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c is the path loss of the activated UL BWP b of carrier f obtained based on the DL RS associated with the PRACH transmission on the activated DL BWP of serving cell C, and offset represents the PRACH transmit power offset of the first type of synchronization signal or the second type of synchronization signal. b,f,cIt is calculated based on the transmission power of the synchronization signal and the detection result. The PL of different synchronization signals b,f,c May be different.

[0171] In an embodiment of the present application, the network side device configures the PRACH transmit power offset for different types of synchronization signals for the PRACH process. Specifically, the configuration is performed in the following two ways: (1) The first PRACH transmit power offset of the first type of synchronization signal and the second PRACH transmit power offset of the second type of synchronization signal are configured in the fourth configuration information, wherein the first PRACH transmit power offset and the second PRACH transmit power offset can be the same, the first PRACH transmit power offset and the second PRACH transmit power offset can also be different, and the first PRACH transmit power offset and the second PRACH transmit power offset can also be equal to 0. (2) The first PRACH transmit power offset of the first type of synchronization signal and the offset compared to the first PRACH transmit power offset are configured in the fourth configuration information. For example, the offset of the first PRACH transmit power offset is -3dB, indicating that the PRACH transmit power of the second type of synchronization signal is 3dB lower than the PRACH transmit power of the first type of synchronization signal.

[0172] In the embodiment of the present application, since the second type of synchronization signal requires multiple TRPs to be sent, resource consumption is high, and the gain of receiving PRACH is greater than that of a single TRP, a lower PRACH transmit power can be used to initiate PRACH. Therefore, by configuring the respective PRACH transmit power offsets of the first type of synchronization signal and the second type of synchronization signal in the fourth configuration information, the PRACH transmit power of the first type of synchronization signal and the second type of synchronization signal is determined, and the terminal can use a lower PRACH transmit power to initiate PRACH.

[0173] Implementation Method 3

[0174] This embodiment describes that a terminal selects multiple synchronization signals of the same type to initiate random access PRACH when differentiating the types of synchronization signals, including steps E1 to E3:

[0175] Step E1: When the terminal selects multiple synchronization signals to initiate PRACH based on the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to the same type, the terminal determines the PRACH transmit power according to the types of the selected multiple synchronization signals;

[0176] Step E2: The terminal determines the RO and preamble corresponding to each of the selected synchronization signals;

[0177] Step E3: The terminal initiates multiple PRACHs using the determined multiple ROs and preambles according to the determined PRACH transmit power.

[0178] In an embodiment of the present application, the calculation method of the PRACH transmit power of synchronization signals of the same type is the same. When multiple selected synchronization signals belong to the same type, the PRACH transmit power of each synchronization signal is determined according to the calculation method of the PRACH transmit power corresponding to the synchronization signal of that type. Each synchronization signal corresponds to a corresponding RO and preamble. The RO and preamble corresponding to the synchronization signal are configured by the network side device through configuration information or protocol agreement. In one embodiment, when the RO and preamble corresponding to the synchronization signal are configured by the network side device, the network side device sends a third configuration information to the terminal. After receiving the third configuration information, the terminal determines the RO and preamble of each of the selected multiple synchronization signals according to the third configuration information.

[0179] Implementation Method 4

[0180] This embodiment describes that when a terminal distinguishes the synchronization signal type and cannot identify the ID information of a TRP, the terminal selects multiple synchronization signals to initiate a random access PRACH, specifically including:

[0181] When the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types, the terminal selects one of the first type of synchronization signal and the second type of synchronization signal to initiate random access PRACH.

[0182] In an embodiment of the present application, since the types of the multiple synchronization signals selected are different, in order to ensure that the network-side device can identify which synchronization signal the terminal is based on to initiate the random access PRACH, the terminal cannot simultaneously use the RO and preamble corresponding to the first type of synchronization signal and the second type of synchronization signal sent by the same TRP to initiate PRACH. Therefore, in the case where the terminal cannot identify the ID information of the TRP, in order to avoid the terminal simultaneously using the RO and preamble corresponding to the first type of synchronization signal and the second type of synchronization signal sent by the same TRP to initiate PRACH, the terminal can only select the first type of synchronization signal or the second type of synchronization signal to initiate random access PRACH. Among them, the ID information for identifying the TRP refers to: identifying the ID of the TRP corresponding to the first type of synchronization signal and the TRP cluster ID corresponding to the second type of synchronization signal.

[0183] For example, the multiple synchronization signals selected by the terminal include: synchronization signal 1, synchronization signal 2, synchronization signal 3, and synchronization signal 4. Among them, synchronization signal 1 belongs to the first type of synchronization signal, and synchronization signal 2, synchronization signal 3, and synchronization signal 4 belong to the second type of synchronization signal. Therefore, when initiating PRACH, the terminal can only select synchronization signal 1 to initiate PRACH, or select synchronization signal 2, synchronization signal 3, and synchronization signal 4 to initiate PRACH.

[0184] Implementation Method Five

[0185] This embodiment describes that when the terminal distinguishes the synchronization signal type and can identify the ID information of the TRP, the terminal selects multiple synchronization signals to initiate random access PRACH, including steps F1 to F4:

[0186] Step F1: When the terminal selects multiple synchronization signals to initiate PRACH based on the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types, the terminal determines a first target ID and a second target ID, where the first target ID is the ID of the TRP corresponding to the selected first type of synchronization signal, and the second target ID is the TRP cluster ID corresponding to the selected second type of synchronization signal;

[0187] Step F2: the terminal determines the RO and preamble corresponding to each selected first type synchronization signal and each selected second type synchronization signal;

[0188] Step F3: When the TRP corresponding to the first target ID belongs to the TRP cluster corresponding to the second target ID, the terminal determines the first PRACH transmit power of the selected first-type synchronization signal, and the terminal initiates PRACH using the RO and preamble of each selected first-type synchronization signal at the first PRACH transmit power; or, the terminal determines the second PRACH transmit power of the selected second-type synchronization signal, and the terminal initiates PRACH using the RO and preamble of each selected second-type synchronization signal at the second PRACH transmit power;

[0189] Step F4: When the TRP corresponding to the first target ID does not belong to the TRP cluster corresponding to the second target ID, the terminal determines the first PRACH transmission power of the selected first type synchronization signal, and the terminal determines the second PRACH transmission power of the selected second type synchronization signal; the terminal initiates PRACH with the first PRACH transmission power using the RO and preamble of each selected first type synchronization signal, and the terminal initiates PRACH with the second PRACH transmission power using the RO and preamble of each selected second type synchronization signal.

[0190] In the embodiment of the present application, the terminal can identify the ID information of the TRP, that is, it can determine the first target ID and the second target ID. Furthermore, by comparing the first target ID and the second target ID, it can be determined whether the first type of synchronization signal and the second synchronization signal sent by the same TR signal P exist in the selected multiple synchronization signals. That is to say, when the TRP corresponding to the first target ID belongs to the TRP cluster corresponding to the second target ID, it means that the first type of synchronization signal and the second synchronization signal sent by the same TRP exist in the selected multiple synchronization signals. At this time, step F3 is executed, and only one of the first type of synchronization signal and the first type of synchronization signal can be selected to initiate PRACH. When the TRP corresponding to the first target ID does not belong to the TRP cluster corresponding to the second target ID, it means that the first type of synchronization signal and the second synchronization signal sent by the same TRP do not exist in the selected multiple synchronization signals. At this time, step F4 is executed, and the first type of synchronization signal and the first type of synchronization signal can be selected at the same time to initiate PRACH.

[0191] In a specific manner, determining the second target ID includes the following two methods:

[0192] Mode 1: The terminal determines the second target ID according to a generation rule or association relationship of the synchronization signal identifier;

[0193] Mode 2: The terminal determines the second target ID according to an indication mode of the TRP cluster ID corresponding to the second type of synchronization signal, where the indication mode includes at least one of the following:

[0194] Item G-1: indicated solely by the first signal or the second signal in the second type of synchronization signal;

[0195] Item G-2: indicated by the first signal and the second signal in the second type of synchronization signal;

[0196] Item G-3: indicated by the physical broadcast channel PBCH information in the second type of synchronization signal;

[0197] One of the first signal and the second signal is a primary synchronization signal PSS, and the other is a secondary synchronization signal SSS.

[0198] In an embodiment of the present application, the terminal determines the second target ID based on the generation rule or association relationship of the synchronization signal identifier in the first configuration information. The first ID (i.e., the cell ID) is indicated in the synchronization signal, and the terminal obtains the second target ID based on the generation rule or association relationship of the synchronization signal identifier and the first ID.

[0199] The terminal determines the second target ID according to the indication method of the TRP cluster ID corresponding to the second type of synchronization signal. Specifically, the first signal or the second signal in the G-1 second type of synchronization signal is separately indicated, which means that the second target ID indication information is carried in the first type of synchronization signal or the second type of synchronization signal, and then the second target ID is obtained based on the indication of the first type of synchronization signal or the second type of synchronization signal. For example, considering that each cell includes three TRP clusters, the second ID can be calculated through the PSS (first signal): Or the second ID can be calculated from the SSS (second signal):

[0200] The common indication of the first signal and the second signal in the second type of synchronization signal in item G-2 refers to the partial indication information of the second target ID carried in the first type of synchronization signal and the second type of synchronization signal, and then the second target ID is obtained based on the indication of the first type of synchronization signal and the second type of synchronization signal. For example, according to PSS (first signal) According to SSS (second signal) The second target ID is

[0201] Regarding the PBCH information indication in the second type of synchronization signal in item G-3, the PBCH information indication in the second type of synchronization signal includes: all or part of the PBCH information in the second type of synchronization signal is carried, and the calculation parameters are carried in the PBCH information in the second type of synchronization signal. The PBCH information carried in whole or in part in the second type of synchronization signal refers to the indication information of the second target ID carried in the PBCH, and then the second target ID is obtained according to the PBCH; the calculation parameters are carried in the PBCH information in the second type of synchronization signal. For example, when the second target ID is obtained through the SSS modulo L, indicating L through the PBCH means that the current cell includes L collaborative TRP clusters.

[0202] Implementation Method 6

[0203] This embodiment describes how a terminal performs adjacent cell synchronization signal measurement when the terminal is in an idle state and resides at a cell edge. Specifically, it includes steps K1 to K3:

[0204] Step K1: The terminal receives fifth configuration information sent by the network-side device, where the fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and neighboring cell synchronization signal information;

[0205] Step K2: When the terminal resides in a TRP cluster at the cell edge, the terminal performs neighboring cell synchronization signal measurement according to the fifth configuration information;

[0206] Step K3: The terminal receives second indication information sent by the network side device, where the second indication information is used to instruct the UE whether to enable neighboring cell synchronization signal measurement;

[0207] The neighboring cell synchronization signal information includes at least one of the following:

[0208] The time-frequency resource location of the synchronization signal;

[0209] Sync raster;

[0210] Synchronization signal type;

[0211] Synchronous signal measurement interval;

[0212] A first ID, where the first ID is a cell ID;

[0213] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0214] In an embodiment of the present application, the adjacent cell synchronization signal includes a first type of synchronization signal and a second type of synchronization signal, and the measurement of the adjacent cell synchronization signal is to measure the first type of synchronization signal and the second type of synchronization signal with a mapping relationship in the adjacent cell. Finally, the adjacent cell synchronization signal measurement result is obtained by linearly averaging the measurement results of the synchronization signal screened out according to the above-mentioned second condition. The mapping relationship between the cell synchronization signal index index set or the TRP cluster and the adjacent cell synchronization signal information can be a mapping relationship between all the synchronization signal index index sets or TRP clusters in the cell and the adjacent cell synchronization signal information, or a mapping relationship between the synchronization signal index index set or the TRP cluster at the edge of the cell and the adjacent cell synchronization signal information. For example, the mapping relationship can be expressed as the cell synchronization signal index set {#1, #5, #6} corresponding to the adjacent cell synchronization signal information #1, the synchronization signal index set {#3, #4, #8} corresponding to the adjacent cell synchronization signal information #2; or, the second ID #A corresponds to the adjacent cell synchronization signal information #1, and the second ID #B corresponds to the adjacent cell synchronization signal information #2.

[0215] In specific implementation, the adjacent cell synchronization signal measurement can be automatically started when the terminal resides in the TRP cluster at the cell edge (i.e., step K2); or it can be started when the terminal receives the second indication information sent by the network side device (i.e., step K3). The second indication information sent by the network side device indicates whether the terminal has started the adjacent cell synchronization signal measurement by indicating in the PBCH or system message associated with the synchronization signal whether the adjacent cell synchronization signal measurement is started. For example, in the PBCH associated with the synchronization signal at the cell edge (determined by the synchronization signal index set, or determined according to the second ID), an information bit is used to indicate whether the terminal has started the adjacent cell measurement.

[0216] In an embodiment of the present application, the terminal can receive the first type of synchronization signal and the second type of synchronization signal sent by the network measurement equipment. When the terminal resides in the TRP cluster at the edge of the cell, it performs adjacent cell synchronization signal measurement, and when it resides in the non-edge TRP cluster inside the cell, it does not perform adjacent cell measurement, thereby reducing unnecessary adjacent cell measurements, which is beneficial to terminal energy saving and complexity reduction.

[0217] Implementation Method Seven

[0218] This embodiment describes that the terminal measures the synchronization signal of the neighboring cell in the connected state and determines whether to perform inter-cell handover based on the measurement result of the synchronization signal of the neighboring cell. Specifically, it includes steps M1 to M3:

[0219] Step M1: the terminal receives the sixth configuration information or the seventh configuration information sent by the network side device;

[0220] Step M2: the terminal performs neighboring cell synchronization signal measurement according to the sixth configuration information or the seventh configuration information;

[0221] Step M3: The terminal determines whether to perform cell handover based on the measurement result of the adjacent cell synchronization signal;

[0222] The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or a neighboring TRP cluster of a neighboring cell;

[0223] The seventh configuration information is used to represent at least one of the following:

[0224] Item H-1: cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells;

[0225] Item H-2: The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the adjacent cell Sync raster;

[0226] Item H-3: the mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the first ID and / or second ID of the neighboring cell;

[0227] Item H-4: The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the time domain and / or frequency domain positions of the synchronization signals of adjacent cells;

[0228] Item H-5: Quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal;

[0229] Item H-6: mapping relationship between the first ID and the second ID and the first ID of one or more adjacent cells;

[0230] Item H-7: mapping relationship between the first ID and the second ID and the first ID and / or second ID of one or more neighboring cells;

[0231] Item H-8: Mapping relationship between the first ID and the second ID and the adjacent cell Sync raster;

[0232] Item H-9: Mapping relationship between the first ID and the second ID and the time domain and / or frequency domain positions of the synchronization signal of the adjacent cell;

[0233] Item H-10: mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured in the adjacent cell;

[0234] The first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

[0235] In an embodiment of the present application, when the terminal performs cross-cell switching, it only needs to measure the synchronization signals sent by some TRPs in the adjacent cells, thereby reducing the resource overhead and complexity of the terminal in the cross-cell process. Specifically, the network measurement device pre-configures the configuration parameters of the cell adjacent to the TRP cluster where the terminal is currently residing and / or the adjacent TRP cluster of the adjacent cell to the terminal through the sixth configuration information. When the LTM switching method is adopted, the terminal measures the synchronization signal of the adjacent cell according to the first ID and the second ID corresponding to the currently accessed synchronization signal, and the sixth configuration information, and obtains the measurement result of the synchronization signal of the adjacent cell. The network measurement device can also configure the mapping relationship of the above items H-1 to H-10 to the terminal through the seventh configuration information, and then the terminal determines the adjacent cell and the TRP cluster in the adjacent cell from the mapping relationships in the seventh configuration information according to the first ID and the second ID corresponding to the currently accessed synchronization signal, and measures the TRP cluster in the adjacent cell to obtain the measurement result of the synchronization signal of the adjacent cell.

[0236] If the measurement result of the synchronization signal of the neighboring cell meets the preset threshold, L1 or L3 reporting will be performed. In addition, the terminal can decide whether to perform cell switching based on the measurement result of the synchronization signal of the neighboring cell, automatically switch to the target cell (or the target TRP cluster of the target cell) and report to the network side. After receiving the switching report, the network side releases the resources of other candidate cells to reduce switching delay and signaling overhead.

[0237] In a second aspect, a synchronization signal transmission method is provided. The method is applied to a network-side device. FIG9 is a flowchart of an implementation of a synchronization signal transmission method provided in an embodiment of the present application. The method includes at least the following steps:

[0238] Step S910: The network side device sends at least one of a first type of synchronization signal and a second type of synchronization signal, where the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

[0239] Through the above steps, the terminal receives at least one of the first type of synchronization signal and the second type of synchronization signal sent by the network-side device, where the first type of synchronization signal is a synchronization signal sent by a single TRP and the second type of synchronization signal is a synchronization signal sent by a TRP cluster; and then measures the received synchronization signal to obtain a measurement result of the synchronization signal. Since the terminal can receive two types of synchronization signals, namely the first type of synchronization signal sent by a single TRP and the second type of synchronization signal sent collaboratively by a TRP cluster, the terminal improves the reliability and success rate of terminal access to the network by receiving multiple types of synchronization signals.

[0240] In an optional embodiment, the method further includes:

[0241] The network-side device sends first configuration information, where the first configuration information includes: at least one of detection threshold indication information and a sending rule, wherein the detection threshold indication information is used to indicate a detection threshold of each of the first-type synchronization signal and the second-type synchronization signal, and the sending rule includes a sending rule of each of the first-type synchronization signal and the second-type synchronization signal;

[0242] The sending rules of the first type synchronization signal and the second type synchronization signal respectively include at least one of the following:

[0243] a transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM);

[0244] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal;

[0245] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0246] the number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal;

[0247] The sending order of the first type of synchronization signal and the second type of synchronization signal respectively;

[0248] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0249] frequency domain positions of the first type of synchronization signal and the second type of synchronization signal;

[0250] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0251] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0252] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0253] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0254] A time domain offset between the transmission start time of the first type synchronization signal and the second type synchronization signal;

[0255] A frequency domain offset between respective frequency domain starting positions of the first type synchronization signal and the second type synchronization signal;

[0256] A quasi-co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0257] In an optional embodiment, the method further includes:

[0258] The network side device sends second configuration information; wherein the second configuration information is used to represent the PRACH transmit power offset.

[0259] In an optional embodiment, the method further includes:

[0260] The network-side device sends third configuration information, where the third configuration information is used to represent at least one of the following items of each of the first-type synchronization signal and the second-type synchronization signal:

[0261] an RO and a preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal;

[0262] Priority, used to indicate the priority of the synchronization signal type for random access;

[0263] The first condition is used to indicate a condition for the terminal to select a synchronization signal type with a lower priority to initiate random access, where the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

[0264] In an optional embodiment, the method further includes:

[0265] The network side device sends first indication information, and the first indication information is used to: indicate the adjusted detection threshold of the first type synchronization signal or the second type synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type synchronization signal or the second type synchronization signal.

[0266] In an optional embodiment, the method further includes:

[0267] The network-side device sends second indication information, where the second indication information is associated with a synchronization signal selected by the terminal, or is associated with a type of synchronization signal selected by the terminal; the second indication information is used for the terminal to determine random access information, where the random access information includes at least one of the following:

[0268] A random access method, wherein the random access method is two-step random access or four-step random access;

[0269] Priority of random access method;

[0270] Indication of disabling of random access method.

[0271] In an optional embodiment, the method further includes:

[0272] The network side device sends fourth configuration information; wherein the fourth configuration information is used to represent the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

[0273] In an optional embodiment, the method further includes:

[0274] The network-side device sends a second condition, where the second condition is used for the terminal to calculate a cell measurement amount using the first-type synchronization signal or the second-type synchronization signal that meets the second condition.

[0275] In an optional embodiment, at least one of the following is further included:

[0276] The network side device sends fifth configuration information, where the fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and adjacent cell synchronization signal information;

[0277] The network side device sends second indication information, where the second indication information is used to instruct the UE whether to enable neighboring cell synchronization signal measurement;

[0278] The neighboring cell synchronization signal information includes at least one of the following:

[0279] The time-frequency resource location of the synchronization signal;

[0280] Sync raster;

[0281] Synchronization signal type;

[0282] Synchronous signal measurement interval;

[0283] A first ID, where the first ID is a cell ID;

[0284] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0285] In an optional embodiment, the method further includes:

[0286] The network side device sends the sixth configuration information or the seventh configuration information;

[0287] The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or a neighboring TRP cluster of a neighboring cell;

[0288] The seventh configuration information is used to represent at least one of the following:

[0289] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells;

[0290] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the adjacent cell sync raster;

[0291] A mapping relationship between a cell synchronization signal index set or a currently connected synchronization signal and the first ID and / or second ID of a neighboring cell;

[0292] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the time domain and / or frequency domain positions of the neighboring cell synchronization signals;

[0293] The quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal;

[0294] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0295] A mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more neighboring cells;

[0296] A mapping relationship between the first ID and the second ID and the adjacent cell Sync raster;

[0297] A mapping relationship between the first ID and the second ID and the time domain and / or frequency domain position of the synchronization signal of the adjacent cell;

[0298] A mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured of the adjacent cell;

[0299] The first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

[0300] The synchronization signal transmission provided in the embodiment of the present application can realize the various processes implemented in the embodiment of the first aspect and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0301] In a third aspect, a synchronization signal transmission device is provided. The device is applied to a terminal. As shown in FIG10 , the synchronization signal transmission device 1000 includes:

[0302] A first receiving module 1010 is configured to receive at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network-side device, wherein the first type of synchronization signal is a synchronization signal sent via a single transmission reception point (TRP), and the second type of synchronization signal is a synchronization signal sent via a TRP cluster, wherein the TRP cluster includes at least two TRPs;

[0303] The first measurement module 1020 is configured to measure the received synchronization signal to obtain a measurement result of the synchronization signal.

[0304] In an optional embodiment, the device further includes:

[0305] A second receiving module is used to receive the first configuration information sent by the network side device;

[0306] a first determining module, configured to determine a type of the received synchronization signal according to the first configuration information;

[0307] The first configuration information includes: at least one of detection threshold indication information and a sending rule, wherein the detection threshold indication information is used to indicate the detection threshold of each of the first type synchronization signal and the second type synchronization signal, and the sending rule includes the sending rule of each of the first type synchronization signal and the second type synchronization signal;

[0308] The sending rules of the first type synchronization signal and the second type synchronization signal respectively include at least one of the following:

[0309] a transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM);

[0310] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal;

[0311] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0312] the number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal;

[0313] The sending order of the first type of synchronization signal and the second type of synchronization signal respectively;

[0314] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0315] frequency domain positions of the first type of synchronization signal and the second type of synchronization signal;

[0316] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0317] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0318] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0319] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0320] A time domain offset between the transmission start time of the first type synchronization signal and the second type synchronization signal;

[0321] A frequency domain offset between respective frequency domain starting positions of the first type synchronization signal and the second type synchronization signal;

[0322] A quasi-co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0323] In an optional embodiment, the device further includes:

[0324] The access module is used for the terminal to select one or more synchronization signals to initiate random access PRACH according to the measurement result of the synchronization signal.

[0325] In an optional embodiment, the access module includes:

[0326] A second determination module is configured to determine the PRACH transmit power corresponding to each of the selected one or more synchronization signals;

[0327] The third determining module is used to determine the PRACH transmission opportunity RO and preamble preamble corresponding to each of the selected one or more synchronization signals;

[0328] The first initiating submodule is configured to initiate PRACH according to the determined PRACH transmit power and using the determined RO and preamble.

[0329] In an optional embodiment, the device further includes:

[0330] The third receiving module is used to receive second configuration information sent by the network side device; wherein the second configuration information is used to represent the PRACH transmit power offset.

[0331] In an optional embodiment, the terminal determines the PRACH transmit power, including:

[0332] The terminal determines the PRACH transmit power according to the second configuration information, where the PRACH transmit power is calculated according to the following equation: PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0333] Among them, P CMAX,f,c(i) is the maximum transmission power configured for the UE on carrier f of serving cell C within transmission opportunity RO i; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c is the path loss of the activated UL BWP b of carrier f obtained based on the DL RS associated with the PRACH transmission on the activated DL BWP of the serving cell C, and offset represents the PRACH transmit power offset.

[0334] In an optional embodiment, the access module includes:

[0335] A fourth determining module is configured to, when the terminal selects a synchronization signal to initiate a PRACH according to the synchronization signal measurement result, determine the type of the selected synchronization signal and determine the PRACH transmit power;

[0336] A fifth determining module, configured to determine an RO and a preamble corresponding to a selected synchronization signal;

[0337] The second initiating submodule is configured to initiate PRACH according to the determined PRACH transmit power and using the determined RO and preamble.

[0338] In an optional embodiment, the access module includes:

[0339] a sixth determining module, configured to, when the terminal selects multiple synchronization signals according to the measurement result of the synchronization signal to initiate the PRACH and determines that the selected multiple synchronization signals belong to the same type, determine, by the terminal, the PRACH transmit power according to the types of the selected multiple synchronization signals;

[0340] a seventh determining module, configured to determine the RO and preamble corresponding to each of the selected plurality of synchronization signals;

[0341] The third initiating submodule is configured to initiate multiple PRACHs using the determined PRACH transmit power and the determined multiple ROs and preambles.

[0342] In an optional embodiment, the access module includes:

[0343] The fourth initiating submodule is configured to select one of the first type of synchronization signal and the second type of synchronization signal to initiate random access PRACH when the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types.

[0344] In an optional embodiment, the access module includes:

[0345] an eighth determination module, configured to, when the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types, determine, by the terminal, a first target ID and a second target ID, where the first target ID is the ID of the TRP corresponding to the selected first type of synchronization signal, and the second target ID is the TRP cluster ID corresponding to the selected second type of synchronization signal;

[0346] a ninth determining module, configured to determine an RO and a preamble corresponding to each selected first-type synchronization signal and each selected second-type synchronization signal;

[0347] a fifth initiating submodule, configured to, when the TRP corresponding to the first target ID belongs to the TRP cluster corresponding to the second target ID, determine, by the terminal, a first PRACH transmit power of the selected first type synchronization signal, and initiate PRACH by using the RO and preamble of each selected first type synchronization signal at the first PRACH transmit power; or, determine, by the terminal, a second PRACH transmit power of the selected second type synchronization signal, and initiate PRACH by using the RO and preamble of each selected second type synchronization signal at the second PRACH transmit power;

[0348] The sixth initiating submodule is used to, when the TRP corresponding to the first target ID does not belong to the TRP cluster corresponding to the second target ID, the terminal determines the first PRACH transmission power of the selected first type synchronization signal, and the terminal determines the second PRACH transmission power of the selected second type synchronization signal; the terminal initiates PRACH with the first PRACH transmission power and the RO and preamble of each selected first type synchronization signal, and the terminal initiates PRACH with the second PRACH transmission power and the RO and preamble of each selected second type synchronization signal.

[0349] In an optional embodiment, the device includes:

[0350] A fourth receiving module is configured to receive third configuration information sent by the network side device, where the third configuration information is used to characterize at least one of the following items of each of the first type of synchronization signal and the second type of synchronization signal:

[0351] an RO and a preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal;

[0352] Priority, used to indicate the priority of the synchronization signal type for random access;

[0353] The first condition is used to indicate a condition for the terminal to select a synchronization signal type with a lower priority to initiate random access, where the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

[0354] In an optional embodiment, the device includes:

[0355] The fifth receiving module is used to receive the first indication information sent by the network side device, wherein the first indication information is used to: indicate the adjusted detection threshold of the first type of synchronization signal or the second type of synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type of synchronization signal or the second type of synchronization signal.

[0356] In an optional embodiment, the device includes:

[0357] a sixth receiving module, configured to receive second indication information sent by the network-side device, where the second indication information is associated with the synchronization signal selected by the terminal, or is associated with the type of the synchronization signal selected by the terminal;

[0358] a tenth determining module, configured to determine random access information according to the second indication information;

[0359] a seventh initiating submodule, configured to select one or more synchronization signals according to the measurement result of the synchronization signal, and initiate a random access PRACH according to the random access information;

[0360] The random access information includes at least one of the following:

[0361] A random access method, wherein the random access method is two-step random access or four-step random access;

[0362] Priority of random access method;

[0363] Indication of disabling of random access method.

[0364] In an optional embodiment, the device includes:

[0365] A seventh receiving module is used to receive fourth configuration information sent by the network side device; wherein the fourth configuration information is used to characterize the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

[0366] In an optional embodiment, the terminal determines the PRACH transmit power, including:

[0367] The terminal determines the PRACH transmit power according to the fourth configuration information and the synchronization signal type, where the PRACH transmit power is calculated according to the following equation: PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0368] Among them, P CMAX,f,c (i) is the maximum transmission power configured for the UE on carrier f of serving cell C within transmission opportunity RO i; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c It is the path loss of the activated UL BWP b of carrier f obtained based on the DL RS associated with PRACH transmission on the activated DL BWP of serving cell C, and offset represents the PRACH transmission power offset of the first type of synchronization signal or the second type of synchronization signal.

[0369] In an optional embodiment, the device includes:

[0370] An eighth receiving module, configured to receive a second condition sent by the network side device, where the second condition is used as a synchronization signal selection threshold for calculating a cell measurement amount;

[0371] The first calculation module is configured to calculate the cell measurement amount by the terminal using the first type of synchronization signal or the second type of synchronization signal that meets the second condition.

[0372] In an optional embodiment, the eighth determining module includes:

[0373] A first determination submodule, configured to determine a second target ID according to a generation rule or association relationship of an identifier of the synchronization signal;

[0374] The second determination submodule is configured to determine, by the terminal, a second target ID according to an indication method of the TRP cluster ID corresponding to the second type of synchronization signal, where the indication method includes at least one of the following:

[0375] indicated solely by the first signal or the second signal in the second type of synchronization signal;

[0376] indicated by both the first signal and the second signal in the second type of synchronization signal;

[0377] Indicated by the physical broadcast channel PBCH information in the second type of synchronization signal;

[0378] One of the first signal and the second signal is a primary synchronization signal PSS, and the other is a secondary synchronization signal SSS.

[0379] In an optional embodiment, the device includes:

[0380] A ninth receiving module is configured to receive fifth configuration information sent by the network side device; the fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and adjacent cell synchronization signal information;

[0381] a second measurement module, configured to, when the terminal resides in a TRP cluster at the edge of a cell, cause the terminal to measure a synchronization signal of an adjacent cell according to the fifth configuration information;

[0382] A tenth receiving module, configured to receive second indication information sent by the network side device, where the second indication information is used to instruct the UE whether to enable neighboring cell synchronization signal measurement;

[0383] The neighboring cell synchronization signal information includes at least one of the following:

[0384] The time-frequency resource location of the synchronization signal;

[0385] Sync raster;

[0386] Synchronization signal type;

[0387] Synchronous signal measurement interval;

[0388] A first ID, where the first ID is a cell ID;

[0389] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0390] In an optional embodiment, the device includes:

[0391] an eleventh receiving module, configured to receive the sixth configuration information or the seventh configuration information sent by the network side device;

[0392] A third measurement module, configured to perform neighboring cell synchronization signal measurement according to the sixth configuration information or the seventh configuration information;

[0393] an eleventh determination module, configured to determine whether to perform cell handover based on a measurement result of a synchronization signal of an adjacent cell;

[0394] The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or a neighboring TRP cluster of a neighboring cell;

[0395] The seventh configuration information is used to represent at least one of the following:

[0396] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells;

[0397] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the adjacent cell Sync raster;

[0398] A mapping relationship between a cell synchronization signal index set or a currently connected synchronization signal and the first ID and / or second ID of a neighboring cell;

[0399] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the time domain and / or frequency domain positions of the neighboring cell synchronization signals;

[0400] The quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal;

[0401] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0402] A mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more neighboring cells;

[0403] A mapping relationship between the first ID and the second ID and the adjacent cell Sync raster;

[0404] A mapping relationship between the first ID and the second ID and the time domain and / or frequency domain position of the synchronization signal of the adjacent cell;

[0405] A mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured of the adjacent cell;

[0406] The first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

[0407] The synchronization signal transmission device provided in the embodiment of the present application can implement the various processes implemented in the corresponding synchronization signal transmission method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0408] In a fourth aspect, a synchronization signal transmission device is provided. The device is applied to a terminal. As shown in FIG11 , the synchronization signal transmission device 1100 includes:

[0409] The first sending module 1110 is used for the network side device to send at least one of the first type of synchronization signal and the second type of synchronization signal, wherein the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

[0410] In an optional embodiment, the device further includes:

[0411] a second sending module, configured to send first configuration information, the first configuration information comprising: at least one of detection threshold indication information and a sending rule, wherein the detection threshold indication information is used to indicate a detection threshold for each of the first type of synchronization signal and the second type of synchronization signal, and the sending rule comprises a sending rule for each of the first type of synchronization signal and the second type of synchronization signal;

[0412] The sending rules of the first type synchronization signal and the second type synchronization signal respectively include at least one of the following:

[0413] a transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM);

[0414] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal;

[0415] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0416] the number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal;

[0417] The sending order of the first type of synchronization signal and the second type of synchronization signal respectively;

[0418] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0419] frequency domain positions of the first type of synchronization signal and the second type of synchronization signal;

[0420] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0421] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0422] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0423] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0424] A time domain offset between the transmission start time of the first type synchronization signal and the second type synchronization signal;

[0425] A frequency domain offset between respective frequency domain starting positions of the first type synchronization signal and the second type synchronization signal;

[0426] A quasi-co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0427] In an optional embodiment, the device further includes:

[0428] The third sending module is used to send second configuration information; wherein the second configuration information is used to represent the PRACH transmit power offset.

[0429] In an optional embodiment, the device further includes:

[0430] a fourth sending module, configured to send third configuration information, where the third configuration information is used to represent at least one of the following items of each of the first type of synchronization signal and the second type of synchronization signal:

[0431] an RO and a preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal;

[0432] Priority, used to indicate the priority of the synchronization signal type for random access;

[0433] The first condition is used to indicate a condition for the terminal to select a synchronization signal type with a lower priority to initiate random access, where the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

[0434] In an optional embodiment, the device further includes:

[0435] The fifth sending module is used to send first indication information, wherein the first indication information is used to: indicate the adjusted detection threshold of the first type of synchronization signal or the second type of synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type of synchronization signal or the second type of synchronization signal.

[0436] In an optional embodiment, the device further includes:

[0437] a sixth sending module, configured to send second indication information, where the second indication information is associated with the synchronization signal selected by the terminal, or is associated with the type of the synchronization signal selected by the terminal; the second indication information is used for the terminal to determine random access information, where the random access information includes at least one of the following:

[0438] A random access method, wherein the random access method is two-step random access or four-step random access;

[0439] Priority of random access method;

[0440] Indication of disabling of random access method.

[0441] In an optional embodiment, the device further includes:

[0442] The seventh sending module is used to send fourth configuration information; wherein the fourth configuration information is used to characterize the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

[0443] In an optional embodiment, the device further includes:

[0444] The network-side device sends a second condition, where the second condition is used for the terminal to calculate a cell measurement amount using the first-type synchronization signal or the second-type synchronization signal that meets the second condition.

[0445] In an optional embodiment, the device further includes:

[0446] an eighth sending module, configured to send fifth configuration information, where the fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and adjacent cell synchronization signal information;

[0447] a ninth sending module, configured to send second indication information, where the second indication information is used to instruct the UE whether to enable neighboring cell synchronization signal measurement;

[0448] The neighboring cell synchronization signal information includes at least one of the following:

[0449] The time-frequency resource location of the synchronization signal;

[0450] Sync raster;

[0451] Synchronization signal type;

[0452] Synchronous signal measurement interval;

[0453] A first ID, where the first ID is a cell ID;

[0454] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0455] In an optional embodiment, the device further includes:

[0456] a tenth sending module, configured to send the sixth configuration information or the seventh configuration information;

[0457] The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or a neighboring TRP cluster of a neighboring cell;

[0458] The seventh configuration information is used to represent at least one of the following:

[0459] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells;

[0460] The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the adjacent cell sync raster;

[0461] A mapping relationship between a cell synchronization signal index set or a currently connected synchronization signal and the first ID and / or second ID of a neighboring cell;

[0462] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the time domain and / or frequency domain positions of the neighboring cell synchronization signals;

[0463] The quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal;

[0464] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0465] A mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more neighboring cells;

[0466] A mapping relationship between the first ID and the second ID and the adjacent cell Sync raster;

[0467] A mapping relationship between the first ID and the second ID and the time domain and / or frequency domain position of the synchronization signal of the adjacent cell;

[0468] A mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured of the adjacent cell;

[0469] The first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

[0470] The synchronization signal transmission device provided in the embodiment of the present application can implement the various processes implemented in the corresponding synchronization signal transmission method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0471] As shown in Figure 12, an embodiment of the present application further provides a communication device 1200, including a processor 1201 and a memory 1202. The memory 1202 stores a program or instruction that can be run on the processor 1201. For example, when the communication device 1200 is a terminal, the program or instruction, when executed by the processor 1201, implements the various steps of the above-mentioned embodiment of the synchronization signal transmission method and can achieve the same technical effect. When the communication device 1200 is a network-side device, the program or instruction, when executed by the processor 1201, implements the various steps of the above-mentioned embodiment of the synchronization signal transmission method and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0472] An embodiment of the present application also provides a terminal, comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instruction to implement the steps of the synchronization signal transmission method in the method embodiment shown in FIG3 . This terminal embodiment corresponds to the aforementioned terminal method embodiment, and the various implementation processes and methods of the aforementioned method embodiment are applicable to this terminal embodiment and can achieve the same technical effects. Specifically, FIG13 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0473] The terminal 1300 includes but is not limited to: a radio frequency unit 1301, a network module 1302, an audio output unit 1303, an input unit 1304, a sensor 1305, a display unit 1306, a user input unit 1307, an interface unit 1308, a memory 1309 and at least some of the components of the processor 1310.

[0474] Those skilled in the art will appreciate that the terminal 1300 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 1310 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG13 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0475] It should be understood that in an embodiment of the present application, the input unit 1304 may include a graphics processing unit (GPU) 13041 and a microphone 13042, and the graphics processor 13041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1306 may include a display panel 13061, and the display panel 13061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1307 includes a touch panel 13071 and at least one of the other input devices 13072. The touch panel 13071 is also called a touch screen. The touch panel 13071 may include two parts: a touch detection device and a touch controller. Other input devices 13072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0476] In the embodiment of the present application, after receiving downlink data from the network-side device, the RF unit 1301 can transmit the data to the processor 1310 for processing. In addition, the RF unit 1301 can send uplink data to the network-side device. Generally, the RF unit 1601 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0477] The memory 1309 can be used to store software programs or instructions and various data. The memory 1309 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 1309 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a 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 RAM bus random access memory (DRRAM). The memory 1309 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0478] Processor 1310 may include one or more processing units. Optionally, processor 1310 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 1310.

[0479] Among them, the radio frequency unit 1301 is used to receive at least one of the first type of synchronization signal and the second type of synchronization signal sent by the network side device, the first type of synchronization signal is a synchronization signal sent through a single transmitting and receiving point TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs, and measures the received synchronization signal to obtain the measurement result of the synchronization signal.

[0480] Processor 1310 is used to receive at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network side device, where the first type of synchronization signal is a synchronization signal sent through a single transmitting and receiving point TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, where the TRP cluster includes at least two TRPs, and measure the received synchronization signal to obtain a measurement result of the synchronization signal.

[0481] Since the terminal 1300 can receive two types of synchronization signals, namely the first type of synchronization signal sent by a single TRP and the second type of synchronization signal sent collaboratively by the TRP cluster, the terminal improves the reliability and success rate of accessing the network by receiving multiple types of synchronization signals.

[0482] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the synchronization signal transmission method described in the method embodiment, and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

[0483] The embodiment of the present application further provides a network side device. As shown in FIG14 , the network side device 1400 includes: a processor 1401, a network interface 1402, and a memory 1403. The network interface 1402 is, for example, a Common Public Radio Interface (CPRI).

[0484] Specifically, the network side device 1400 of the embodiment of the present application also includes: instructions or programs stored in the memory 1403 and executable on the processor 1401. The processor 1401 calls the instructions or programs in the memory 1403 to execute the synchronization signal transmission method shown in FIG9 and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0485] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned synchronization signal transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0486] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0487] An embodiment of the present application further provides a chip, which includes 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 the various processes of the above-mentioned synchronization signal transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0488] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0489] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned synchronization signal transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0490] An embodiment of the present application also provides a synchronization signal transmission communication system, which includes: a terminal and a network side device, wherein the terminal is used to execute the steps executed by the terminal in the above method embodiment, and the network side device is used to execute the steps executed by the network side device in the above method embodiment.

[0491] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0492] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0493] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A synchronization signal transmission method, comprising: The terminal receives at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network side device, wherein the first type of synchronization signal is a synchronization signal sent through a single transmission and reception point TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs; The terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal.

2. The method according to claim 1, wherein: Also includes: The terminal receives first configuration information sent by the network side device; Determining, according to the first configuration information, a type of the received synchronization signal; The first configuration information includes: at least one of detection threshold indication information and sending rules, wherein the detection threshold indication information is used to indicate the detection thresholds of the first type of synchronization signal and the second type of synchronization signal, respectively, and the sending rules include the sending rules of the first type of synchronization signal and the second type of synchronization signal, respectively; The sending rules of the first type of synchronization signal and the second type of synchronization signal respectively include at least one of the following: A transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM); a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively; an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal; The number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal; The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence; The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively; The frequency domain positions of the first type of synchronization signal and the second type of synchronization signal respectively; The time domain range of each of the first type of synchronization signal and the second type of synchronization signal; The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal; A time domain interval between the first type of synchronization signal and the second type of synchronization signal; A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal; A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal; A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal; A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

3. The method according to claim 1 or 2, wherein: Also includes: The terminal selects one or more synchronization signals according to the measurement result of the synchronization signal to initiate random access PRACH.

4. The method according to claim 3, wherein: The terminal selects one or more synchronization signals to initiate a random access PRACH according to the synchronization signal measurement result, including: The terminal determines the PRACH transmit power corresponding to each of the selected one or more synchronization signals; The terminal determines a PRACH transmission opportunity RO and a preamble preamble corresponding to each of the selected one or more synchronization signals; The terminal initiates PRACH according to the determined PRACH transmit power and using the determined RO and preamble.

5. The method according to claim 4, wherein: Also includes: The terminal receives second configuration information sent by the network side device; wherein the second configuration information is used to represent the PRACH transmit power offset.

6. The method according to claim 5, wherein: The terminal determines the PRACH transmit power, including: The terminal determines the PRACH transmit power according to the second configuration information, where the PRACH transmit power is calculated according to the following equation: P PRACH,b,f,c (i)=min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c }; Among them, P CMAX,f,c (i) is the maximum transmission power configured for the UE on carrier f of serving cell C within transmission opportunity RO i; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c is the path loss of the activated UL BWP b of the carrier f obtained based on the DL RS associated with the PRACH transmission on the activated DL BWP of the serving cell C, and offset represents the PRACH transmit power offset.

7. The method according to claim 3, wherein: The terminal selects one or more synchronization signals to initiate a random access PRACH according to the synchronization signal measurement result, including: In a case where the terminal selects a synchronization signal to initiate a PRACH according to the synchronization signal measurement result, the terminal determines a type of the selected synchronization signal and determines a PRACH transmit power; The terminal determines the RO and preamble corresponding to the selected synchronization signal; The terminal initiates the PRACH with the determined PRACH transmit power and using the determined RO and preamble.

8. The method according to claim 3, wherein: The terminal selects one or more synchronization signals to initiate a random access PRACH according to the measurement result of the synchronization signal, including: In a case where the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to the same type, the terminal determines the PRACH transmit power according to the types to which the selected multiple synchronization signals belong; The terminal determines the RO and preamble corresponding to each of the selected multiple synchronization signals; The terminal initiates multiple PRACHs using the determined multiple ROs and preambles according to the determined PRACH transmit power.

9. The method according to claim 3, wherein: The terminal selects one or more synchronization signals to initiate a random access PRACH according to the measurement result of the synchronization signal, including: In a case where the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types, the terminal selects one of the first type of synchronization signal and the second type of synchronization signal to initiate random access PRACH.

10. The method according to claim 3, wherein: The terminal selects one or more synchronization signals to initiate a random access PRACH according to the measurement result of the synchronization signal, including: In a case where the terminal selects multiple synchronization signals to initiate PRACH according to the measurement result of the synchronization signal and determines that the selected multiple synchronization signals belong to different types, the terminal determines a first target ID and a second target ID, wherein the first target ID is an ID of a TRP corresponding to the selected first type of synchronization signal, and the second target ID is a TRP cluster ID corresponding to the selected second type of synchronization signal; The terminal determines the RO and preamble corresponding to each selected first type synchronization signal and each selected second type synchronization signal; In a case where the TRP corresponding to the first target ID belongs to the TRP cluster corresponding to the second target ID, the terminal determines a first PRACH transmit power of the selected first type synchronization signal, and the terminal initiates PRACH with the first PRACH transmit power and using the RO and preamble of each selected first type synchronization signal; or, the terminal determines a second PRACH transmit power of the selected second type synchronization signal, and the terminal initiates PRACH with the second PRACH transmit power and using the RO and preamble of each selected second type synchronization signal; In a case where the TRP corresponding to the first target ID does not belong to the TRP cluster corresponding to the second target ID, the terminal determines the first PRACH transmission power of the selected first type synchronization signal, and the terminal determines the second PRACH transmission power of the selected second type synchronization signal; the terminal initiates PRACH with the first PRACH transmission power, using the RO and preamble of each selected first type synchronization signal, and the terminal initiates PRACH with the second PRACH transmission power, using the RO and preamble of each selected second type synchronization signal.

11. The method according to any one of claims 7 to 10, wherein: Also includes: The terminal receives third configuration information sent by the network side device, where the third configuration information is used to characterize at least one of the following items of the first type of synchronization signal and the second type of synchronization signal: an RO and a preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal; Priority, used to indicate the priority of the synchronization signal type for random access; The first condition is used to indicate a condition for the terminal to select a synchronization signal type with a lower priority to initiate random access, and the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

12. The method according to any one of claims 7 to 10, wherein: Also includes: The terminal receives first indication information sent by the network side device, and the first indication information is used to: indicate the adjusted detection threshold of the first type of synchronization signal or the second type of synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type of synchronization signal or the second type of synchronization signal.

13. The method according to any one of claims 3 to 12, wherein: Also includes: The terminal receives second indication information sent by the network side device, where the second indication information is associated with the synchronization signal selected by the terminal, or is associated with the type of the synchronization signal selected by the terminal; The terminal determines random access information according to the second indication information; The terminal selects one or more synchronization signals to initiate a random access PRACH according to the measurement result of the synchronization signal, including: The terminal selects one or more synchronization signals according to the measurement result of the synchronization signal, and initiates a random access PRACH according to the random access information; The random access information includes at least one of the following: A random access method, wherein the random access method is a two-step random access or a four-step random access; Priority of random access method; Indication of disabling of random access method.

14. The method according to any one of claims 7 to 13, wherein: Also includes: The terminal receives fourth configuration information sent by the network side device; wherein the fourth configuration information is used to characterize the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

15. The method according to claim 14, wherein: The terminal determines the PRACH transmit power, including: The terminal determines, according to the fourth configuration information and the synchronization signal type, a PRACH transmit power, where the PRACH transmit power is calculated according to the following equation: P PRACH,b,f,c (i)=min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c }; Among them, P CMAX,f,c (i) is the maximum transmission power configured for the UE on carrier f of serving cell C within transmission opportunity ROi; P PRACH,target,b,f,c is the PRACH target received power on the activated UL BWP b of carrier f on serving cell C; PL b,f,c It is the path loss of the activated UL BWP b of the carrier f obtained based on the DL RS associated with the PRACH transmission on the activated DL BWP of the serving cell C, and offset represents the PRACH transmission power offset of the first type of synchronization signal or the second type of synchronization signal.

16. The method according to any one of claims 1 to 15, wherein: Also includes: The terminal receives a second condition sent by the network side device, where the second condition is used for a synchronization signal selection threshold for calculating a cell measurement amount; The terminal calculates the cell measurement amount using the first type of synchronization signal or the second type of synchronization signal that meets the second condition.

17. The method according to claim 10, wherein: Determine the second target ID, including: The terminal determines the second target ID according to a generation rule or association relationship of the identification of the synchronization signal; The terminal determines the second target ID according to the indication mode of the TRP cluster ID corresponding to the second type of synchronization signal, where the indication mode includes at least one of the following: is indicated solely by the first signal or the second signal in the second type of synchronization signal; indicated by a first signal and a second signal in the second type of synchronization signal; Indicated by the physical broadcast channel PBCH information in the second type of synchronization signal; One of the first signal and the second signal is a primary synchronization signal PSS, and the other is a secondary synchronization signal SSS.

18. The method according to claim 1, wherein: Also includes: The terminal receives fifth configuration information sent by the network side device; When the terminal resides in a TRP cluster at the edge of a cell, the terminal performs neighboring cell synchronization signal measurement according to the fifth configuration information; The fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and adjacent cell synchronization signal information; The terminal receives second indication information sent by the network side device, where the second indication information is used to indicate whether the UE starts measurement of a synchronization signal of a neighboring cell; The neighboring cell synchronization signal information includes at least one of the following: The time-frequency resource location of the synchronization signal; Sync raster; Synchronization signal type; Synchronous signal measurement interval; A first ID, where the first ID is a cell ID; The second ID is the TRP cluster ID of the TRP cluster in the cell.

19. The method according to claim 1, wherein: Also includes: The terminal receives the sixth configuration information or the seventh configuration information sent by the network side device; The terminal performs neighboring cell synchronization signal measurement according to the sixth configuration information or the seventh configuration information; The terminal determines whether to perform cell switching based on the measurement result of the adjacent cell synchronization signal; The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or an adjacent TRP cluster of an adjacent cell; The seventh configuration information is used to represent at least one of the following: The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells; The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the adjacent cell sync raster; A mapping relationship between a cell synchronization signal index set or a currently connected synchronization signal and a first ID and / or a second ID of a neighboring cell; The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the time domain and / or frequency domain position of the adjacent cell synchronization signal; The quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal; A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells; A mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more neighboring cells; A mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell; A mapping relationship between the first ID and the second ID and the time domain and / or frequency domain position of the synchronization signal of the adjacent cell; A mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured in the adjacent cell; Among them, the first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

20. A synchronization signal transmission method, comprising: The network side device sends at least one of a first type of synchronization signal and a second type of synchronization signal, wherein the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

21. The method according to claim 20, wherein: Also includes: The network side device sends first configuration information, where the first configuration information includes: at least one of detection threshold indication information and a sending rule, wherein the detection threshold indication information is used to indicate the detection threshold of each of the first type of synchronization signal and the second type of synchronization signal, and the sending rule includes the sending rule of each of the first type of synchronization signal and the second type of synchronization signal; The sending rules of the first type of synchronization signal and the second type of synchronization signal respectively include at least one of the following: A transmission mode of the first type of synchronization signal and the second type of synchronization signal, wherein the transmission mode includes any one of code division multiplexing (CDM), time division multiplexing (TDM), and frequency division multiplexing (FDM); a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively; an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal; The number of synchronization signals of the first type of synchronization signal and the number of synchronization signals of the second type of synchronization signal; The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence; The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively; The frequency domain positions of the first type of synchronization signal and the second type of synchronization signal respectively; The time domain range of each of the first type of synchronization signal and the second type of synchronization signal; The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal; A time domain interval between the first type of synchronization signal and the second type of synchronization signal; A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal; A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal; A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal; A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

22. The method according to claim 20 or 21, wherein: Also includes: The network side device sends second configuration information; wherein the second configuration information is used to characterize the PRACH transmit power offset.

23. The method according to any one of claims 20 to 22, wherein: Also includes: The network side device sends third configuration information, where the third configuration information is used to characterize at least one of the following items of the first type of synchronization signal and the second type of synchronization signal: an RO and a preamble corresponding to each synchronization signal belonging to the first type of synchronization signal and the second type of synchronization signal; Priority, used to indicate the priority of the synchronization signal type for random access; The first condition is used to indicate a condition for the terminal to select a synchronization signal type with a lower priority to initiate random access, and the synchronization signal type with a lower priority is one of the first type of synchronization signal and the second type of synchronization signal.

24. The method according to any one of claims 20 to 23, wherein: Also includes: The network side device sends first indication information, where the first indication information is used to: indicate the adjusted detection threshold of the first type of synchronization signal or the second type of synchronization signal, or the first indication information is used to indicate the adjustment amount of the detection threshold of the first type of synchronization signal or the second type of synchronization signal.

25. The method according to any one of claims 20 to 24, wherein: Also includes: The network side device sends second indication information, where the second indication information is associated with the synchronization signal selected by the terminal, or is associated with the type of the synchronization signal selected by the terminal; the second indication information is used for the terminal to determine random access information, where the random access information includes at least one of the following: A random access method, wherein the random access method is a two-step random access or a four-step random access; Priority of random access method; Indication of disabling of random access method.

26. The method according to any one of claims 20 to 25, wherein: Also includes: The network side device sends fourth configuration information; wherein the fourth configuration information is used to characterize the PRACH transmission power offset of each of the first type synchronization signal and the second type synchronization signal.

27. The method according to any one of claims 20 to 26, wherein: Also includes: The network side device sends a second condition, where the second condition is used for the terminal to calculate the cell measurement amount using the first type of synchronization signal or the second type of synchronization signal that meets the second condition.

28. The method of claim 20, wherein: Also includes at least one of the following: The network side device sends fifth configuration information, where the fifth configuration information is used to represent: a mapping relationship between a cell synchronization signal index set or a TRP cluster and adjacent cell synchronization signal information; The network side device sends second indication information, where the second indication information is used to indicate whether the UE starts measurement of a synchronization signal of a neighboring cell; The neighboring cell synchronization signal information includes at least one of the following: The time-frequency resource location of the synchronization signal; Sync raster; Synchronization signal type; Synchronous signal measurement interval; A first ID, where the first ID is a cell ID; The second ID is the TRP cluster ID of the TRP cluster in the cell.

29. The method according to claim 20, wherein: Also includes: The network side device sends sixth configuration information or seventh configuration information; The sixth configuration information includes configuration parameters of a cell adjacent to the TRP cluster in which the terminal currently resides and / or an adjacent TRP cluster of an adjacent cell; The seventh configuration information is used to represent at least one of the following: The cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cells; The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the adjacent cell sync raster; A mapping relationship between a cell synchronization signal index set or a currently connected synchronization signal and a first ID and / or a second ID of a neighboring cell; The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the time domain and / or frequency domain position of the adjacent cell synchronization signal; The quasi-co-location relationship between the synchronization signal to be measured in the adjacent cell and the synchronization signal index set or the currently accessed synchronization signal; A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells; A mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more neighboring cells; A mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell; A mapping relationship between the first ID and the second ID and the time domain and / or frequency domain position of the synchronization signal of the adjacent cell; A mapping relationship between the first ID and the second ID and the sequence number of the synchronization signal to be measured in the adjacent cell; Among them, the first ID is the cell ID, and the second ID is the TRP cluster ID of the TRP cluster in the cell.

30. A synchronization signal transmission device, wherein: include: A first receiving module, configured to receive at least one of a first type of synchronization signal and a second type of synchronization signal sent by a network side device, wherein the first type of synchronization signal is a synchronization signal sent by a single transmission receiving point TRP, and the second type of synchronization signal is a synchronization signal sent by a TRP cluster, and the TRP cluster includes at least two TRPs; The first measurement module is used to measure the received synchronization signal to obtain a measurement result of the synchronization signal.

31. A synchronization signal transmission device, wherein: include: The first sending module is used for a network side device to send at least one of a first type of synchronization signal and a second type of synchronization signal, wherein the first type of synchronization signal is a synchronization signal sent through a single TRP, and the second type of synchronization signal is a synchronization signal sent through a TRP cluster, and the TRP cluster includes at least two TRPs.

32. A terminal, wherein: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the synchronization signal transmission method as described in any one of claims 1 to 19 are implemented.

33. A network side device, wherein: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the synchronization signal transmission method as described in any one of claims 20 to 29 are implemented.

34. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the synchronization signal transmission method as described in any one of claims 1 to 19, or the steps of the synchronization signal transmission method as described in any one of claims 20 to 29 are implemented.

35. A chip, wherein: The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the steps of the synchronization signal transmission method as described in any one of claims 1 to 19, or the steps of the synchronization signal transmission method as described in any one of claims 20 to 29.

36. A computer program product, wherein: The program product is stored in a non-volatile storage medium, and the program product is executed by at least one processor to implement the steps of the synchronization signal transmission method as described in any one of claims 1 to 19, or the steps of the synchronization signal transmission method as described in any one of claims 20 to 29.

37. An electronic device, wherein: The electronic device is configured to perform the steps of the synchronization signal transmission method according to any one of claims 1 to 19, or the steps of the synchronization signal transmission method according to any one of claims 20 to 29.

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