Synchronization signal transmission method, device and equipment

Abstract

The invention discloses a synchronization signal transmission method, device and equipment, and belongs to the technical field of communication. The synchronization signal transmission method comprises: a terminal receiving 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 being a synchronization signal sent by a single transmit receive point (TRP), and the second type of synchronization signal being a synchronization signal sent by a TRP cluster, the TRP cluster comprises at least two TRPs; and the terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal. The terminal can receive two types of synchronization signals, namely the first type of synchronization signals sent by the single TRP and the second type of synchronization signals sent by the TRP cluster in a cooperative manner, so that the terminal improves the reliability and success rate of the terminal accessing the network by receiving multiple types of synchronization signals.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a synchronization signal transmission method, device and equipment. Background Art

[0002] The cell-free massive MIMO (Multiple-Input Multiple-Output) system breaks the concept of cells and distributes a large number of antennas over a wide area, and the terminals are also distributed over this wide area. These antennas are called Transmit-Receive Points (TRP) or Access Points (AP). In theory, each terminal can communicate with each AP. The cell-free massive MIMO network is expected to be applied to the next generation of indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping malls, stadiums, subways, hospitals, community centers or university campuses.

[0003] However, the number or sending method of synchronization signal blocks (SSB) in the related art is difficult to 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

[0004] 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.

[0005] In a first aspect, a synchronization signal transmission method is provided, the method comprising:

[0006] 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;

[0007] The terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal.

[0008] In a second aspect, a synchronization signal transmission method is provided, the method comprising:

[0009] 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.

[0010] In a third aspect, a synchronization signal transmission device is provided, the device comprising:

[0011] 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, wherein the TRP cluster includes at least two TRPs;

[0012] The first measurement module is used to measure the received synchronization signal to obtain a measurement result of the synchronization signal.

[0013] In a fourth aspect, a synchronization signal transmission device is provided, the device comprising:

[0014] 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.

[0015] 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.

[0016] In a 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 described in the second aspect are implemented.

[0017] 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.

[0018] In an embodiment of the present application, 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 by a single TRP, and the second type of synchronization signal is a synchronization signal sent by 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, a first type of synchronization signal sent by a single TRP and a second type of synchronization signal sent by a TRP cluster in cooperation, the terminal improves the reliability and success rate of the terminal accessing the network by receiving multiple types of synchronization signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0020] Figure 2 is a schematic diagram of a SSB beam scanning process based on a TDM method in an embodiment of the present application;

[0021] Figure 3 is a flowchart of a synchronization signal transmission method in an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of sending a synchronization signal in an embodiment of the present application;

[0023] Figure 5 is a schematic diagram of a synchronization signal sent in a TDM manner in an embodiment of the present application;

[0024] Figure 6 is another schematic diagram of a synchronization signal sent in a TDM manner in an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of another synchronization signal sent in a TDM manner in an embodiment of the present application;

[0026] Figure 8 is a schematic diagram of a synchronization signal sent in an FDM manner in an embodiment of the present application;

[0027] Fig. 9 is a flowchart of another synchronization signal transmission method in an embodiment of the present application;

[0028] Fig.10 is a structural diagram of a synchronization signal transmission device in an embodiment of the present application;

[0029] Fig.11 is a structural diagram of another synchronization signal transmission device in an embodiment of the present application;

[0030] Fig.12 is a structural diagram of a communication device in an embodiment of the present application;

[0031] Fig.13 is a schematic diagram of the structure of a terminal in an embodiment of the present application;

[0032] Fig.14 It is a structural diagram of a network side device in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0034] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0035] The term "indication" in this application can be 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, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0036] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. The following description describes a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, but these technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6G) communication system.

[0037] Figure 1A block diagram of a wireless communication system applicable to the embodiments of the present application is shown. The wireless communication system includes a terminal device 11 and a network side device 12. Among them, the terminal device 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) equipment, a robot, a wearable device (Wearable Device), a vehicle-mounted equipment (VUE), a pedestrian terminal (PUE), a smart home (home equipment with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (personal computer, PC), a teller machine or a self-service machine and other terminal side devices, and the wearable device includes: a smart watch, a smart bracelet, a smart headset, a smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), a smart wristband, a smart clothing, etc. It should be noted that the specific type of the terminal device 11 is not limited in the embodiment 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 B node, a home evolved B node, a transmitting and receiving point (TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary, it should be noted that in the embodiment of the present application, only the base station in the NR system is 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 (Mobility Management Entity, MME), access mobility management function (Access and Mobility Management Function, AMF), session management function (Session Management Function, SMF), user plane function (UserPlane Function, UPF), policy control function (Policy Control Function, PCF), policy and charging rules function unit (Policy and Charging Rules Function, PCRF), edge application service discovery function (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data storage (Unified Data Repository, UDR), home user server (Home Subscriber Server, HSS), centralized network configuration (CNC), network storage function (Network Repository Function, NRF), network exposure function (Network Exposure Function, NEF), local NEF (Local NEF, or L-NEF), binding support function (Binding Support Function, BSF), Application Function (AF), etc. It should be noted that in the embodiment 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.

[0038] To facilitate understanding of the technical solutions provided by the present application, the main technical concepts involved in the embodiments of the present application are briefly described below.

[0039] Cell search and synchronization process in NR technology:

[0040] In 5G NR technology, SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS) and the physical broadcast channel signal (PBCH). Among them, SSB occupies 4 orthogonal frequency division multiplexing (OFDM) symbols in the time domain and 20 RBs in the frequency domain. SSB uses code division multiplexing (CDM) between different cells, and the cell to which SSB belongs is distinguished according to different physical cell IDs.

[0041] In order to achieve downlink synchronization, the terminal (User Equipment, UE) needs to obtain the frequency of the access carrier by searching the SSB. Since the spectrum range of NR is very wide, in order to reduce the complexity of the search, the terminal performs SSB search 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 point according to the synchronization raster, and selects any SSB whose SS-RSRP is higher than the threshold value rsrp-ThresholdSSB. By demodulating the primary synchronization signal PSS, secondary synchronization signal SSS and physical broadcast channel PBCH signal in the selected SSB, the terminal completes the cell selection and synchronization with the base station, and then performs random access.

[0042] 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 sweep so that the synchronization signal covers the service range of the entire cell. The SSBs required to complete a beam sweep constitute an SSB Burst Set. Figure 2 As shown, in 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 radio frame (5ms), and the beam directions of SSB signals with different (time domain resources) in the same SSB burst set are different.

[0043] Two-step RACH and four-step RACH:

[0044] In the related art, the random access process can be divided into a contention-based random access process and a non-contention-based random access process. The random access process can be a four-step random access process (also called a Type-1 random access process) or a two-step random access process (also called a Type-2 random access process).

[0045] In the competitive 4-step random access process (Random Access Channel, RACH), the UE first sends Msg1 to the network, including preamble; after the network detects the preamble, it will send Msg2 / RAR (Random Access Response) message, including the number of the preamble detected by the network, and the uplink wireless resources allocated to the UE to send msg3; after receiving Msg2, the UE confirms that at least one of the numbers of the preamble carried in Msg2 is consistent with the number of the preamble sent by itself, and then sends Msg3 containing contention resolution information according to the resources indicated by RAR; after the network receives Msg3, it will send Msg4 containing contention resolution information; after receiving Msg4, the UE confirms that the contention resolution information is consistent with that sent in Msg3, that is, the 4-step random access is completed. Among them, the network includes UL grant information in RAR to indicate Msg3 PUSCH scheduling information, and includes RAPID (RACH preamble ID), TC-RNTI, TA and other information. If the network does not receive Msg3PUSCH, it can schedule the retransmission of Msg3 Physical Uplink Shared Channel (PUSCH) in the TC-RNTI scrambled PDCCH.

[0046] For the contention random access process, different terminals randomly select preambles for transmission, so different terminals may select the same preamble to send on the same time-frequency radio resource (RO resource). This situation can be understood as a preamble conflict of the terminal. In this case, different terminals will receive the same RAR. At this time, different terminals will transmit Msg3 PUSCH according to 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, so the network will include the contention resolution information received in Msg3 in Msg4. If the contention resolution information in Msg4 received by the terminal matches the contention resolution information sent by the terminal in Msg3 PUSCH, the terminal considers that the contention resolution is successful. If they do not match, the contention resolution is considered unsuccessful. If the contention resolution is unsuccessful, the terminal reselects the RACH transmission resource, sends the physical random access channel (PRACH), and makes the next random access attempt.

[0047] In NR Rel-16, the two-step random access process 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 message to the terminal. If the terminal does not receive Msg B within a certain period of time, the UE will accumulate 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 MsgA is sent reaches a certain threshold, the terminal will switch from the 2-step random access process to the 4-step random access process. Msg A includes the Msg Apreamble part and the Msg A PUSCH part. The preamble part is sent on the RO used for 2-stepRACH, and the PUSCH part is sent on the Msg A PUSCH resources associated with the sending of the Msg A preamble and the RO. MsgAPUSCH resources are a set of PUSCH resources configured relative to each PRACH slot, including time-frequency resources and demodulation reference signal (DMRS) resources.

[0048] Cell switching:

[0049] Cell switching refers to the process of a terminal switching from one cell to another. Cell switching includes L3-based cell switching and L1 / 2-based cell switching. Specifically, the process of L3-based cell switching is as follows:

[0050] 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;

[0051] Step 2: The network side device determines whether cell switching is required based on the cell quality reported by the terminal side;

[0052] Step 3: If the network side device determines that a cell handover is required, a handover request command is sent to the target cell; the target cell feeds back the RRC reconfiguration signaling to the serving cell;

[0053] 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;

[0054] 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 indication and SSB index, performs downlink synchronization at the frame level, time slot level and symbol level, and adjusts the automatic gain control AGC parameters according to the received power of the SSB;

[0055] Step 6: After downlink synchronization, the terminal performs uplink synchronization through RACH until a random receive response (RAR) is received to obtain TA, and the uplink synchronization is completed;

[0056] Step 7: After the above steps are completed, the target cell sends a cell switching completion indication to the serving cell.

[0057] From the above process, it can be seen that the terminal needs to detect 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. The switching takes a long time. In order to reduce the switching delay, the protocol further supports L1 / 2-based cell switching.

[0058] 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 switching command to the terminal based on the L1 measurement results. The terminal switches to the target cell based on the switching command indication and RRC pre-configuration. The specific process is as follows:

[0059] Step 1: The network side device CU pre-configures the L1 measurement reporting configuration and the configuration parameters of the candidate cell to the terminal;

[0060] Step 2: After the L1 measurement result meets the conditions, the terminal performs L1 reporting;

[0061] Step 3: The network side device DU notifies the terminal to switch through the L1 / 2 switching command (HO cmd);

[0062] Step 4: The terminal applies the pre-configured target cell configuration parameters and automatically switches to the target cell.

[0063] Cell measurement:

[0064] 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 will be 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 SIB2 / SIB4 is not configured with the nrofSS-BlocksToAverage parameter, or SIB2 / SIB4 is not configured with the absThreshSS-BlocksConsolidation parameter, 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 higher than the threshold absThreshSS-BlocksConsolidation.

[0065] In the related art, if a terminal wants to obtain distributed cooperative transmission, it needs to access the network first, and then in the connected state, it can 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 in the random access phase of the idle state. In addition, in the Cell free network, when the super cell range becomes larger and the TRPs contained become denser, the number of synchronization signals needs to increase. The synchronization signal in 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, there may be coverage problems or greater interference in 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 to perform random access or cell switching based on the measurement results.

[0066] 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, 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 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, a first type of synchronization signal sent by a single TRP and a 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. 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.

[0067] Furthermore, the terminal receives at least one of the first type of synchronization signal and the second type of synchronization signal, and can receive the signal in a connected state and an idle state, so that the present application can obtain a collaborative gain in the transmission of the random access phase in the idle state. In one embodiment, it is determined whether to perform neighboring cell synchronization signal measurement based on the location where the terminal resides, thereby reducing the terminal measurement behavior and complexity related to the connected cell switching or idle cell measurement in the Cellfree network.

[0068] The following is a detailed description of the synchronization signal transmission method provided in the embodiment of the present application through some embodiments and their application scenarios in combination with the accompanying drawings.

[0069] In a first aspect of the embodiment of the present application, a synchronization signal transmission method is provided, the method is applied to a terminal, see Figure 3 As shown, it is a flowchart of an implementation method of a synchronization signal transmission method provided in an embodiment of the present application, and the method may include the following steps:

[0070] 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, wherein the first type of synchronization signal is a synchronization signal sent by a single transmission and reception 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;

[0071] Step S320: the terminal measures the received synchronization signal to obtain a measurement result of the synchronization signal.

[0072] In the embodiment of the present application, the terminal may be Figure 1 The terminal device 11 in the network side device may be Figure 1 The access network device or core network device in the embodiment. 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.

[0073] In specific implementation, the network side device can send the synchronization signal through a single TRP, or through multiple TRPs (i.e., a TRP cluster) to send the synchronization signal in collaboration. Figure 4 As shown, synchronization signal 1, synchronization signal 2, synchronization signal 4 and synchronization signal 5 are all sent by a single TRP (TRP1 or TRP2), belonging to the first type of synchronization signal. Synchronization signal 3 is sent by TRP1 and TRP2 in collaboration, belonging to the second type of synchronization signal.

[0074] After receiving the synchronization signal, the terminal performs measurement to obtain the measurement result of the synchronization signal, and 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 by a TRP cluster in collaboration, the terminal improves the reliability and success rate of the terminal accessing the network by receiving multiple types of synchronization signals.

[0075] 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's access to the network.

[0076] In an optional embodiment, the synchronization signal received by the terminal includes a first type of synchronization signal and a second type of synchronization signal. In order to distinguish the types of the synchronization signals, the terminal further performs the following steps S330 and S340:

[0077] Step S330: The terminal receives first configuration information sent by the network side device;

[0078] Step S340: Determine the type of the received synchronization signal according to the first configuration information.

[0079] 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;

[0080] 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:

[0081] 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);

[0082] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively;

[0083] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0084] 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;

[0085] The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence;

[0086] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0087] The frequency domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0088] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0089] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0090] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0091] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0092] A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal;

[0093] A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal;

[0094] A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0095] 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. The detection thresholds can be configured for the first type of synchronization signal and the second type of synchronization signal, respectively, wherein the synchronization signals configured with the same detection threshold are synchronization signals of the same type. Then, 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 a specific implementation, the 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, the first detection threshold threshold1=X is configured for the first type of synchronization signal, and the second detection threshold threshold threshold2=Y is configured for the second type of synchronization signal, wherein the first detection threshold and the second detection threshold can be the same, or the first detection threshold and the second detection threshold can be different. In addition, the first detection threshold can also be configured for the first type of synchronization signal in the first configuration information, and the offset compared to the first detection threshold can be indicated. For example, if the offset of the detection threshold indicated is 3dB, it means that the second detection threshold is 3dB higher than the first detection threshold.

[0096] 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.

[0097] (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 identification of the synchronization signal, 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 is different from the first type of synchronization signal ID range (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).

[0098] Specifically, the IDs of the first type of synchronization signal and the second type of synchronization signal can be defined uniformly or separately. In an example, the uniform definition means that the IDs of the first type of synchronization signal and the second type of synchronization signal are defined as 1 to 16, where 1 to 8 are the first type of synchronization signal IDs and 9 to 16 are the second type of synchronization signal IDs; the separate definitions mean that the first type of synchronization signal IDs are 1-1 to 1-8 and the second type of synchronization signal IDs are 2-1 to 2-8.

[0099] (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 (such as TDM) of each type of synchronization signal, 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, Figure 5 As shown in the figure, 16 synchronization signals are used as a transmission cycle. The first 8 synchronization signals are the first type of synchronization signals, which are sent separately by each TRP in TDM mode. The interval between adjacent synchronization signals is δ 1 The last 8 synchronization signals are the second type of synchronization signals, which are sent by multiple TRPs in TDM mode. The interval between adjacent synchronization signals is δ 2 (δ 2 Can be compared with δ 1 The same, or configured separately); the time domain offset offset of the first type of synchronization signal and the second type of synchronization signal sending start time is Δ t .

[0100] In a specific implementation, if the first type of synchronization signal and the second type of synchronization signal are separated in time domain position, then the frequency domain positions may completely overlap, partially overlap, or not overlap at all. Figure 6 As shown, the first type of synchronization signal and the second type of synchronization signal are separated in the time domain position; wherein, the second type of synchronization signal A completely overlaps with the frequency domain position of the first type of synchronization signal, the second type of synchronization signal B and the second type of synchronization signal C partially overlap with the frequency domain position of the first type of synchronization signal, and the second type of synchronization signal D does not overlap with the frequency domain position of the first type of synchronization signal. Moreover, within the respective time domain positions of the first type of synchronization signal and the second type of synchronization signal, the same type of synchronization signal can be sent in the form of TDM, FDM or CDM. Figure 7 As shown, the first type of synchronization signal and the second type of synchronization signal are separated in the time domain position, and the first type of synchronization signal and the second type of synchronization signal are respectively sent in the FDM mode in their respective time domain positions.

[0101] (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 of each type of synchronization signal (such as FDM), 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.

[0102] In a specific implementation, if the two types of synchronization signals are separated in frequency domain position, the time domain positions may completely overlap, partially overlap, or not overlap at all, such as Figure 8 As shown, the first type of synchronization signal and the second type of synchronization signal are separated in the frequency domain position; wherein, the second type of synchronization signal A completely overlaps with the time domain position of the first type of synchronization signal, the second type of synchronization signal B and the second type of synchronization signal C partially overlap with the time domain position of the first type of synchronization signal, and the second type of synchronization signal D does not overlap with the time domain position of the first type of synchronization signal. Moreover, within their respective time domain positions, the same type of synchronization signal can be sent in the form of TDM, FDM or CDM.

[0103] In an optional embodiment, after obtaining the measurement result of the synchronization signal, the terminal performs step S350:

[0104] Step S350: The terminal selects one or more synchronization signals to initiate random access PRACH according to the measurement result of the synchronization signal.

[0105] In the embodiment of the present application, the measurement result of the synchronization signal can reflect the communication quality of the synchronization signal, so according to 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 signal received by the terminal includes two types, and 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 according to the measurement result, a synchronization signal is selected from the received synchronization signal for random access. If the terminal can distinguish the type of the received synchronization signal, then according to the measurement result of the synchronization signal, and in combination with the selection information associated with the type of the synchronization signal (for example, the priority of the type of the synchronization signal), one or more synchronization signals are selected to initiate random access.

[0106] It can be understood 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 implementation method 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 independently, 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 situations: 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 implementation method two is used to respectively explain the process of selecting a synchronization signal to initiate random access, and the implementation method three is used to explain the process of selecting multiple synchronization signals of the same type to initiate random access, and the implementation methods four and five are used to explain the random process of multiple different types of synchronization signals.

[0107] In an optional embodiment, in order to ensure that the random access process can be successfully completed, the terminal further performs the following steps:

[0108] Step S360: 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:

[0109] 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;

[0110] Item C-2: Priority, used to indicate the priority of the synchronization signal type for random access;

[0111] 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.

[0112] 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 failures due to access conflicts.

[0113] 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 detecting the preamble in Msg 1 or Msg A. 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.

[0114] 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 according to 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 implementation modes 2 to 5, one or more synchronization signals can be selected to initiate random access PRACH based on the priority.

[0115] For item C-3, the first condition is used to indicate the condition for the terminal to select a synchronization signal type with a lower priority to initiate random access. For example, if the first condition may be that the measurement result of the high-priority synchronization signal does not meet the detection threshold, then the synchronization signal type with a lower priority is selected for random access. In the following implementation modes 2 to 5, one or more synchronization signals may be selected to initiate random access PRACH based on the first condition.

[0116] In an optional embodiment, the terminal further performs the following steps:

[0117] 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.

[0118] In the embodiment of the present application, the network side device can dynamically indicate or adjust the detection threshold of a certain type of synchronization signal; for example, when most terminals choose to access the second type of synchronization signal, the network side can increase the detection threshold of the second type of synchronization signal and indicate it to the terminal through the first indication information, and then the terminal selects one or more synchronization signals to initiate random access according to the adjusted detection threshold. Therefore, by adjusting the detection threshold, the access behavior of the terminal can be adjusted, resource overhead can be reduced, and access reliability can be reduced due to overly concentrated access requests, which is conducive to load balancing between different synchronization signal resources.

[0119] 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.

[0120] (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.

[0121] (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 result, the terminal may access the synchronization signal sent by the TRP cluster collaboratively, resulting in higher overhead, and the access reliability and success rate may also be reduced due to centralized access. Therefore, by distinguishing the two types of synchronization signals, one or more synchronization signals are selected to initiate random access in combination with the measurement results of the synchronization signal and the selection information associated with the synchronization signal type, so as to reduce 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.

[0122] Mode 1: According to the detection threshold configured by the first configuration information, one or more synchronization signals are selected to initiate random access. For example, the first detection threshold of the first type of synchronization signal is X, and the second detection threshold of the second type of synchronization signal is Y. The first type of synchronization signal greater than the first detection threshold X and the second type of synchronization signal greater than the second detection threshold Y are selected to initiate random access. For another example, the indicated first detection threshold is X, and the offset of the first detection threshold is A. Then, the first type of synchronization signal greater than the first detection threshold X and the second type of synchronization signal greater than the second detection threshold (X+A) are selected to initiate random access.

[0123] Mode 2: Select one or more synchronization signals to initiate random access according to the first indication information. For example, when most terminals select the second type of synchronization signal for access, the network side device can increase the detection threshold of the second type of synchronization signal and indicate it to the terminal, and then the terminal selects one or more synchronization signals to initiate random access according to the adjusted detection threshold.

[0124] Mode 3: According to the priority or the first condition of the synchronization signal type configured in the third configuration, one or more synchronization signals are selected to initiate random access. For example, if the priority of the first type of synchronization signal is higher than that of the second type of synchronization signal, 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 preferentially selects the first type of synchronization signal whose measurement results meet the detection threshold.

[0125] In an optional embodiment, after obtaining the measurement result of the synchronization signal, the terminal performs the following steps S370 to S390:

[0126] 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;

[0127] Step S380: the terminal determines random access information according to the second indication information;

[0128] 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;

[0129] The random access information includes at least one of the following:

[0130] Item D-1: random access method, wherein the random access method is two-step random access or four-step random access;

[0131] Item D-2: Priority of random access method;

[0132] Item D-3: Disable indication of random access method.

[0133] In an embodiment of the present application, the random access process may be a four-step random access process or a two-step random access process. The network side device may 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 is then possible to determine 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 the two-step random access success rate is relatively high, which can indicate that two-step random access is given priority.

[0134] Specifically, for the random access method D-1, the network side device can indicate the corresponding random access method for a certain type of synchronization signal, and can also 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 can indicate the terminal to access through a four-step random access method in the first indication information (such as a system message associated with the first type of synchronization signal); or, when the terminal selects the second type of synchronization signal to initiate random access PRACH, the network side device can indicate the terminal to access through a two-step random access method in the first indication information (such as a system message associated with the second type of synchronization signal). For another example, when the terminal selects synchronization signal #1 to initiate initial access, the network side device can indicate in the first indication information that it accesses through a four-step random access method on synchronization signal #1.

[0135] For the priority of the random access method in item D-2, the network side device may indicate the priority or ranking of the random access type for a certain type of synchronization signal or a single synchronization signal. For example, 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 should access by the two-step random access method first.

[0136] For the indication of the prohibition of random access method D-3, the network side can 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 can indicate 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).

[0137] In an optional embodiment, in order to obtain the cell measurement amount, the terminal performs the following steps:

[0138] 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;

[0139] 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.

[0140] In an embodiment of the present application, the second condition is used for the synchronization signal selection threshold for calculating the cell measurement quantity, for example, the reference signal received power RSRP selection threshold. A plurality of synchronization signals are included in the cell, so when calculating the cell measurement quantity, it is necessary to select the synchronization signal that meets the second condition, so as to linearly average the measurement results of the synchronization signal that meets the second condition to obtain the cell measurement quantity. For example, the second condition selects the threshold value H, and the synchronization signal whose measurement result is greater than the selected threshold value H is determined as the synchronization signal that meets the second condition. In the case of 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, and then the measurement results of the first type of synchronization signal are screened by threshold 1, and the measurement results of the second type of synchronization signal are screened by threshold 2, and finally the area measurement quantity is calculated based on the screened synchronization signal.

[0141] Based on the calculation method of the cell measurement amount in the implementation of the present application, the terminal performs neighbor cell synchronization signal measurement in an idle state according to the resident position, which specifically corresponds to implementation mode six below; the terminal performs neighbor cell synchronization signal measurement in a connected state, and determines whether to perform cross-cell switching based on the measurement result of the neighbor cell synchronization signal, which specifically corresponds to implementation mode seven below.

[0142] Next, the synchronization signal transmission method proposed in the above embodiment is described through the following implementation method.

[0143] Implementation Method 1

[0144] This implementation describes that the terminal selects one or more synchronization signals to initiate random access PRACH according to the synchronization signal measurement result without distinguishing the synchronization signal type. Specifically, it includes steps A1 to A3:

[0145] Step A1: The terminal determines the PRACH transmit power corresponding to each of the selected one or more synchronization signals;

[0146] Step A2: The terminal determines the PRACH transmission opportunity RO and preamble preamble corresponding to each of the selected one or more synchronization signals;

[0147] Step A3: The terminal initiates PRACH with the determined PRACH transmit power and using the determined RO and preamble.

[0148] In the embodiment of the present application, the PRACH transmit power refers to the transmit power of Msg 1 or Msg A sent when the terminal initiates PRACH. Since the terminal does not distinguish the type of synchronization signal, in step A1, for the selected one or more synchronization signals, the PRACH transmit power corresponding to each synchronization signal is determined using the same calculation method, that is, whether it is a first type of synchronization signal or a second type of synchronization signal, the PRACH transmit power is determined using the same calculation method.

[0149] Each synchronization signal corresponds to a corresponding RO and preamble, and the synchronization signal corresponding to the RO and preamble is configured by the network side device through configuration information or agreed upon by the protocol. In one embodiment, when the synchronization signal corresponding to the RO and preamble is configured by the network side device, the network side device sends the 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.

[0150] 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 Msg2 / 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 reception space parameters of synchronization signal #i. If the terminal successfully receives Msg 2 with multiple synchronization signals and passes the verification, it selects any Msg 2 to respond and sends Msg3; if the listening windows of multiple Msg 1s are all timed out, it is considered that the transmission of Msg 1 has failed, and Msg1 transmission is re-executed. (2) The process of two-step random access 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 are timed out, it is considered that the Msg A transmission has failed and Msg A transmission is re-executed.

[0151] Optionally, the terminal determines the PRACH transmit power through the following steps B1 and B2:

[0152] 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;

[0153] Step B2: The terminal determines the PRACH transmit power according to the second configuration information, and the PRACH transmit power is calculated according to the following equation:

[0154] P PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0155] 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.

[0156] In the embodiment of the present application, the terminal does not distinguish the type of synchronization signal, and the PRACH transmit power of all synchronization signals is calculated in the same way. Therefore, the PRACH transmit power offset refers to the PRACH transmit power offset of all synchronization signals, that is, all synchronization signals calculate the PRACH transmit power of the synchronization signal based on the same PRACH transmit power offset.

[0157] Implementation Method 2

[0158] This implementation manner describes that the terminal selects a synchronization signal to initiate random access PRACH when distinguishing the types of synchronization signals, including steps C1 to C3:

[0159] Step C1: When the terminal selects a synchronization signal to initiate PRACH according to the synchronization signal measurement result, the terminal determines the type of the selected synchronization signal and determines the PRACH transmission power;

[0160] Step C2: the terminal determines the RO and preamble corresponding to the selected synchronization signal;

[0161] Step C3: The terminal initiates PRACH using the determined RO and preamble with the determined PRACH transmit power.

[0162] In an embodiment of the present application, the PRACH transmit power of different types of synchronization signals is determined in different ways. Therefore, the PRACH transmit power of the type of synchronization signal is determined according to the PRACH transmit power calculation method corresponding to the synchronization signal type. Each synchronization signal corresponds to a corresponding RO and preamble, and 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, 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 may initiate PRACH using the determined RO and preamble, which may be a four-step random access or a two-step random access.

[0163] Optionally, when the terminal distinguishes the type of synchronization signal, the terminal determines the PRACH transmit power through the following steps D1 and D2:

[0164] Step D1: 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 of synchronization signal and the second type of synchronization signal.

[0165] Step D2: 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:

[0166] P PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c}

[0167] 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 of the first type of synchronization signal or the second type of synchronization signal.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.

[0168] 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. The configuration is specifically carried out 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 may be the same, the first PRACH transmit power offset and the second PRACH transmit power offset may also be different, and the first PRACH transmit power offset and the second PRACH transmit power offset may 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.

[0169] In the embodiment of the present application, since the second type of synchronization signal requires multiple TRPs to be sent, the resource consumption is high, and the gain of receiving PRACH is greater than that of a single TRP, and thus 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 initiate PRACH with a lower PRACH transmit power.

[0170] Implementation Method 3

[0171] This implementation manner describes that the terminal selects multiple synchronization signals of the same type to initiate random access PRACH when distinguishing the types of synchronization signals, including steps E1 to E3:

[0172] Step E1: 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 the same type, the terminal determines the PRACH transmit power according to the types to which the selected multiple synchronization signals belong;

[0173] Step E2: the terminal determines the RO and preamble corresponding to each of the selected multiple synchronization signals;

[0174] Step E3: The terminal initiates multiple PRACHs using the determined multiple ROs and preambles according to the determined PRACH transmit power.

[0175] In an embodiment of the present application, the calculation method of the PRACH transmission power of the same type of synchronization signals is the same. When the selected multiple synchronization signals belong to the same type, the PRACH transmission power of each synchronization signal is determined according to the calculation method of the PRACH transmission power corresponding to the synchronization signal of this type. Each synchronization signal corresponds to a corresponding RO and preamble, and the RO and preamble corresponding to the synchronization signal are configured by the network side 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 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.

[0176] Implementation Method 4

[0177] This implementation mode describes that when the terminal distinguishes the type of synchronization signal and cannot identify the ID information of the TRP, the terminal selects multiple synchronization signals to initiate random access PRACH, specifically including:

[0178] 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.

[0179] In the embodiment of the present application, since the types of the multiple selected synchronization signals 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 the 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.

[0180] 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. When the terminal initiates PRACH, it can only select synchronization signal 1 to initiate PRACH, or select synchronization signal 2, synchronization signal 3, and synchronization signal 4 to initiate PRACH.

[0181] Implementation Method 5

[0182] This implementation mode describes that when the terminal distinguishes the type of synchronization signal and can identify the ID information of TRP, the terminal selects multiple synchronization signals to initiate random access PRACH, including steps F1 to F4:

[0183] Step F1: 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 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;

[0184] Step F2: the terminal determines the RO and preamble corresponding to each selected first type synchronization signal and each selected second type synchronization signal;

[0185] Step F3: In the case where 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 with the first PRACH transmit power and using the RO and preamble of each selected first type synchronization signal; or, the terminal determines the 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;

[0186] 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.

[0187] 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 there are first-class synchronization signals and second-class synchronization signals sent by the same TR signal P in the selected multiple synchronization signals. In other words, when the TRP corresponding to the first target ID belongs to the TRP cluster corresponding to the second target ID, it means that there are first-class synchronization signals and second-class synchronization signals sent by the same TRP in the selected multiple synchronization signals. At this time, step F3 is executed, and only one of the first-class synchronization signal and the first-class 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 there are no first-class synchronization signals and second-class synchronization signals sent by the same TRP in the selected multiple synchronization signals. At this time, step F4 is executed, and the first-class synchronization signal and the first-class synchronization signal can be selected at the same time to initiate PRACH.

[0188] In a specific manner, determining the second target ID includes the following two methods:

[0189] Mode 1: The terminal determines the second target ID according to a generation rule or association relationship of the identifier of the synchronization signal;

[0190] Mode 2: 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, and the indication mode includes at least one of the following:

[0191] Item G-1: indicated solely by the first signal or the second signal in the second type of synchronization signal;

[0192] Item G-2: indicated by the first signal and the second signal in the second type of synchronization signal;

[0193] Item G-3: indicated by the physical broadcast channel PBCH information in the second type of synchronization signal;

[0194] One of the first signal and the second signal is a primary synchronization signal PSS, and the other is a secondary synchronization signal SSS.

[0195] In the embodiment of the present application, the terminal determines the second target ID according to the generation rule or association relationship of the identification of the synchronization signal in the first configuration information. The first ID (i.e., the cell ID) is indicated in the synchronization signal, and then the terminal obtains the second target ID according to the generation rule or association relationship of the identification of the synchronization signal and the first ID.

[0196] 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 second type of synchronization signal of item G-1 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 by PSS (first signal): Or the second ID can be calculated by SSS (second signal):

[0197] 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 respectively, 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

[0198] Regarding the PBCH information indication in the second type of synchronization signal of 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. Among them, the PBCH information carried in the second type of synchronization signal in whole or in part means that the PBCH carries the indication information of the second target ID, 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 mode L, L is indicated through the PBCH, which means that the current cell includes L collaborative TRP clusters.

[0199] Implementation Method 6

[0200] This embodiment describes that when a terminal is in an idle state and resides at a cell edge, the terminal performs adjacent cell synchronization signal measurement. Specifically, it includes steps K1 to K3:

[0201] 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 adjacent cell synchronization signal information;

[0202] Step K2: When the terminal resides in a TRP cluster at the edge of a cell, the terminal performs adjacent cell synchronization signal measurement according to the fifth configuration information;

[0203] Step K3: 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 synchronization signals of adjacent cells;

[0204] The neighboring cell synchronization signal information includes at least one of the following:

[0205] The time-frequency resource location of the synchronization signal;

[0206] Sync raster;

[0207] Synchronization signal type;

[0208] Synchronous signal measurement interval;

[0209] A first ID, where the first ID is a cell ID;

[0210] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0211] 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 adjacent cell synchronization signal measurement is to measure the first type of synchronization signal and the second type of synchronization signal having a mapping relationship in the adjacent cell. Finally, the adjacent cell synchronization signal measurement result is obtained by linearly averaging the measurement result of the synchronization signal screened out according to the above-mentioned second condition. The mapping relationship between the cell synchronization signal index set or TRP cluster and the adjacent cell synchronization signal information can be a mapping relationship between all the synchronization signal index sets or TRP clusters in the cell and the adjacent cell synchronization signal information, or a mapping relationship between the synchronization signal index set or 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.

[0212] In specific implementation, the adjacent cell synchronization signal measurement can be that when the terminal resides in the TRP cluster at the edge of the cell, the adjacent cell synchronization signal measurement is automatically turned on (i.e., step K2); or when the terminal receives the second indication information sent by the network side device, the adjacent cell synchronization signal measurement is turned on (i.e., step K3). The second indication information sent by the network side device indicates whether the terminal turns on the adjacent cell synchronization signal measurement by indicating in the PBCH or system message associated with the synchronization signal, for example, in the PBCH associated with the synchronization signal at the edge of the cell (determined by the synchronization signal index set, or determined according to the second ID), an information bit is used to indicate whether the terminal turns on the neighboring cell measurement.

[0213] 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 a TRP cluster at the edge of the cell, the terminal performs adjacent cell synchronization signal measurement, and when the terminal resides in a non-edge TRP cluster inside the cell, no adjacent cell measurement is performed. This can reduce unnecessary adjacent cell measurements, which is beneficial to terminal energy saving and complexity reduction.

[0214] Implementation Method 7

[0215] This implementation describes that the terminal measures the synchronization signal of the neighboring cell in the connected state, and determines whether to perform inter-cell handover according to the measurement result of the synchronization signal of the neighboring cell. Specifically, it includes steps M1 to M3:

[0216] Step M1: the terminal receives the sixth configuration information or the seventh configuration information sent by the network side device;

[0217] Step M2: the terminal performs neighboring cell synchronization signal measurement according to the sixth configuration information or the seventh configuration information;

[0218] Step M3: The terminal determines whether to perform cell switching based on the measurement result of the synchronization signal of the adjacent cell;

[0219] 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;

[0220] The seventh configuration information is used to represent at least one of the following:

[0221] Item H-1: the cell synchronization signal index set or the mapping relationship between the currently connected synchronization signal and the synchronization signal information of the adjacent cell;

[0222] Item H-2: the mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the Sync raster of the adjacent cell;

[0223] Item H-3: 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 adjacent cell;

[0224] Item H-4: 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;

[0225] 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;

[0226] Item H-6: mapping relationship between the first ID and the second ID and the first ID of one or more adjacent cells;

[0227] Item H-7: mapping relationship between the first ID and the second ID and the first ID and / or the second ID of one or more adjacent cells;

[0228] Item H-8: mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell;

[0229] Item H-9: 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;

[0230] 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;

[0231] 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.

[0232] In an embodiment of the present application, when the terminal performs cross-cell switching, it only needs to measure the synchronization signal sent by some TRPs in the adjacent cell, 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.

[0233] If the measurement result of the synchronization signal of the neighboring cell meets the preset threshold, L1 or L3 reporting is 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 other candidate cell resources to reduce switching delay and signaling overhead.

[0234] In a second aspect, a synchronization signal transmission method is provided, which is applied to a network side device, see Fig. 9 FIG. 1 is a flowchart of a synchronization signal transmission method provided in an embodiment of the present application, and the method includes at least the following steps:

[0235] Step S910: 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.

[0236] 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, 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; then the received synchronization signal is measured to obtain the 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 by the TRP cluster in collaboration, the terminal improves the reliability and success rate of the terminal's access to the network by receiving multiple types of synchronization signals.

[0237] In an optional embodiment, it also includes:

[0238] 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;

[0239] 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:

[0240] 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);

[0241] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively;

[0242] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0243] 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;

[0244] The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence;

[0245] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0246] The frequency domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0247] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0248] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0249] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0250] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0251] A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal;

[0252] A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal;

[0253] A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0254] In an optional embodiment, it also includes:

[0255] The network side device sends second configuration information; wherein the second configuration information is used to characterize the PRACH transmit power offset.

[0256] In an optional embodiment, it also includes:

[0257] 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:

[0258] 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;

[0259] Priority, used to indicate the priority of the synchronization signal type for random access;

[0260] 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.

[0261] In an optional embodiment, it also includes:

[0262] 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.

[0263] In an optional embodiment, it also includes:

[0264] 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:

[0265] A random access method, wherein the random access method is a two-step random access or a four-step random access;

[0266] Priority of random access method;

[0267] Indication of disabling of random access method.

[0268] In an optional embodiment, it also includes:

[0269] 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.

[0270] In an optional embodiment, it also includes:

[0271] 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.

[0272] In an optional embodiment, at least one of the following is also included:

[0273] 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;

[0274] 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;

[0275] The neighboring cell synchronization signal information includes at least one of the following:

[0276] The time-frequency resource location of the synchronization signal;

[0277] Sync raster;

[0278] Synchronization signal type;

[0279] Synchronous signal measurement interval;

[0280] A first ID, where the first ID is a cell ID;

[0281] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0282] In an optional embodiment, it also includes:

[0283] The network side device sends sixth configuration information or seventh configuration information;

[0284] 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;

[0285] The seventh configuration information is used to represent at least one of the following:

[0286] 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;

[0287] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the adjacent cell sync raster;

[0288] 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;

[0289] 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;

[0290] 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;

[0291] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0292] 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;

[0293] A mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell;

[0294] 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;

[0295] 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;

[0296] 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.

[0297] 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.

[0298] In a third aspect, a synchronization signal transmission device is provided, and the device is applied to a terminal, such as Fig.10 As shown, the synchronization signal transmission device 1000 includes:

[0299] 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 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;

[0300] The first measurement module 1020 is used to measure the received synchronization signal to obtain a measurement result of the synchronization signal.

[0301] In an optional embodiment, the device further includes:

[0302] A second receiving module, used to receive first configuration information sent by the network side device;

[0303] A first determining module, configured to determine a type of a received synchronization signal according to the first configuration information;

[0304] 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;

[0305] 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:

[0306] 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);

[0307] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively;

[0308] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0309] 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;

[0310] The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence;

[0311] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0312] The frequency domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

[0313] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0314] The frequency domain range of each of the first type of synchronization signal and the second type of synchronization signal;

[0315] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0316] A frequency domain interval between the first type of synchronization signal and the second type of synchronization signal;

[0317] A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal;

[0318] A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal;

[0319] A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0320] In an optional embodiment, the device further includes:

[0321] 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.

[0322] In an optional embodiment, the access module includes:

[0323] A second determination module is used to determine the PRACH transmit power corresponding to each of the selected one or more synchronization signals;

[0324] A third determination module is used to determine the PRACH transmission opportunity RO and preamble preamble corresponding to each of the selected one or more synchronization signals;

[0325] The first initiating submodule is configured to initiate PRACH according to the determined PRACH transmit power and using the determined RO and preamble.

[0326] In an optional embodiment, the device further includes:

[0327] 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 characterize the PRACH transmission power offset.

[0328] In an optional embodiment, the terminal determines the PRACH transmit power, including:

[0329] 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:

[0330] P PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0331] 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.

[0332] In an optional embodiment, the access module includes:

[0333] A fourth determination module, 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;

[0334] A fifth determination module, used to determine the RO and preamble corresponding to a selected synchronization signal;

[0335] The second initiating submodule is used to initiate PRACH according to the determined PRACH transmission power and using the determined RO and preamble.

[0336] In an optional embodiment, the access module includes:

[0337] A sixth determination 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 the PRACH transmit power according to the type to which the selected multiple synchronization signals belong;

[0338] A seventh determination module, used to determine the RO and preamble corresponding to each of the selected multiple synchronization signals;

[0339] The third initiating submodule is configured to initiate multiple PRACHs using the determined PRACH transmit power and the determined multiple ROs and preambles.

[0340] In an optional embodiment, the access module includes:

[0341] The fourth initiating submodule is used 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.

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

[0343] 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, 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;

[0344] A ninth determination module, configured to determine an RO and a preamble corresponding to each selected first type synchronization signal and each selected second type synchronization signal;

[0345] 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, 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;

[0346] The sixth initiating submodule is used for, 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.

[0347] In an optional embodiment, the device comprises:

[0348] A fourth receiving module is used 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:

[0349] 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;

[0350] Priority, used to indicate the priority of the synchronization signal type for random access;

[0351] 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.

[0352] In an optional embodiment, the device comprises:

[0353] 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.

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

[0355] 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;

[0356] a tenth determining module, configured to determine random access information according to the second indication information;

[0357] 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;

[0358] The random access information includes at least one of the following:

[0359] A random access method, wherein the random access method is a two-step random access or a four-step random access;

[0360] Priority of random access method;

[0361] Indication of disabling of random access method.

[0362] In an optional embodiment, the device comprises:

[0363] The 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.

[0364] In an optional embodiment, the terminal determines the PRACH transmit power, including:

[0365] 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:

[0366] P PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,b,f,c +offset+PL b,f,c};

[0367] 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 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.

[0368] In an optional embodiment, the device comprises:

[0369] An eighth receiving module, configured to receive 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;

[0370] The first calculation module is used for the terminal to calculate the cell measurement amount by using the first type of synchronization signal or the second type of synchronization signal that meets the second condition.

[0371] In an optional embodiment, the eighth determining module includes:

[0372] A first determination submodule, configured to determine a second target ID according to a generation rule or association relationship of an identifier of a synchronization signal;

[0373] 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, wherein the indication method includes at least one of the following:

[0374] is indicated solely by the first signal or the second signal in the second type of synchronization signal;

[0375] indicated by a first signal and a second signal in the second type of synchronization signal;

[0376] Indicated by the physical broadcast channel PBCH information in the second type of synchronization signal;

[0377] One of the first signal and the second signal is a primary synchronization signal PSS, and the other is a secondary synchronization signal SSS.

[0378] In an optional embodiment, the device comprises:

[0379] A ninth receiving module, 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;

[0380] A second measurement module, configured to, when the terminal resides in a TRP cluster at the edge of a cell, cause the terminal to perform adjacent cell synchronization signal measurement according to the fifth configuration information;

[0381] A tenth receiving module, configured to receive second indication information sent by the network side device, where the second indication information is used to indicate whether the UE turns on the measurement of the synchronization signal of the adjacent cell;

[0382] The neighboring cell synchronization signal information includes at least one of the following:

[0383] The time-frequency resource location of the synchronization signal;

[0384] Sync raster;

[0385] Synchronization signal type;

[0386] Synchronous signal measurement interval;

[0387] A first ID, where the first ID is a cell ID;

[0388] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0389] In an optional embodiment, the device comprises:

[0390] an eleventh receiving module, configured to receive the sixth configuration information or the seventh configuration information sent by the network side device;

[0391] A third measurement module, configured to perform adjacent cell synchronization signal measurement according to the sixth configuration information or the seventh configuration information;

[0392] An eleventh determination module, configured to determine whether to perform cell switching based on the measurement result of the synchronization signal of the adjacent cell;

[0393] 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;

[0394] The seventh configuration information is used to represent at least one of the following:

[0395] 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;

[0396] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the adjacent cell sync raster;

[0397] 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;

[0398] 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;

[0399] 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;

[0400] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0401] 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;

[0402] A mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell;

[0403] 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;

[0404] 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;

[0405] 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.

[0406] The synchronization signal transmission device provided in the embodiment of the present application can implement the various processes implemented by the corresponding synchronization signal transmission method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0407] In a fourth aspect, a synchronization signal transmission device is provided, and the device is applied to a terminal, such as Fig.11 As shown, the synchronization signal transmission device 1100 includes:

[0408] The first sending module 1110 is used for the 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.

[0409] In an optional embodiment, the device further includes:

[0410] a second sending module, configured to send first configuration information, wherein 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;

[0411] 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:

[0412] 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);

[0413] a generation rule of the identifiers of the first type of synchronization signal and the second type of synchronization signal respectively;

[0414] an association relationship between the identifier of the first type of synchronization signal and the identifier of the second type of synchronization signal;

[0415] 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;

[0416] The first type of synchronization signal and the second type of synchronization signal are respectively sent in a sequence;

[0417] The time domain positions of the first type of synchronization signal and the second type of synchronization signal respectively;

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

[0419] The time domain range of each of the first type of synchronization signal and the second type of synchronization signal;

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

[0421] A time domain interval between the first type of synchronization signal and the second type of synchronization signal;

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

[0423] A time domain offset between the transmission start time of the first type of synchronization signal and the second type of synchronization signal;

[0424] A frequency domain offset between respective frequency domain starting positions of the first type of synchronization signal and the second type of synchronization signal;

[0425] A quasi co-site QCL relationship between the first type of synchronization signal and the second type of synchronization signal.

[0426] In an optional embodiment, the device further includes:

[0427] The third sending module is used to send second configuration information; wherein the second configuration information is used to characterize the PRACH transmission power offset.

[0428] In an optional embodiment, the device further includes:

[0429] A fourth sending module is used to send 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:

[0430] 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;

[0431] Priority, used to indicate the priority of the synchronization signal type for random access;

[0432] 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.

[0433] In an optional embodiment, the device further includes:

[0434] 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.

[0435] In an optional embodiment, the device further includes:

[0436] 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:

[0437] A random access method, wherein the random access method is a two-step random access or a four-step random access;

[0438] Priority of random access method;

[0439] Indication of disabling of random access method.

[0440] In an optional embodiment, the device further includes:

[0441] 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.

[0442] In an optional embodiment, the device further includes:

[0443] 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.

[0444] In an optional embodiment, the device further includes:

[0445] 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;

[0446] A ninth sending module, configured to send second indication information, where the second indication information is used to indicate whether the UE turns on the neighboring cell synchronization signal measurement;

[0447] The neighboring cell synchronization signal information includes at least one of the following:

[0448] The time-frequency resource location of the synchronization signal;

[0449] Sync raster;

[0450] Synchronization signal type;

[0451] Synchronous signal measurement interval;

[0452] A first ID, where the first ID is a cell ID;

[0453] The second ID is the TRP cluster ID of the TRP cluster in the cell.

[0454] In an optional embodiment, the device further includes:

[0455] a tenth sending module, configured to send the sixth configuration information or the seventh configuration information;

[0456] 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;

[0457] The seventh configuration information is used to represent at least one of the following:

[0458] 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;

[0459] The mapping relationship between the cell synchronization signal index set or the currently connected synchronization signal and the adjacent cell sync raster;

[0460] 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;

[0461] 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;

[0462] 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;

[0463] A mapping relationship between the first ID and the second ID and the first ID of one or more neighboring cells;

[0464] 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;

[0465] A mapping relationship between the first ID and the second ID and the Sync raster of the adjacent cell;

[0466] 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;

[0467] 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;

[0468] 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.

[0469] The synchronization signal transmission device provided in the embodiment of the present application can implement the various processes implemented by the corresponding synchronization signal transmission method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0470] like Fig.12 As shown, the embodiment of the present application further provides a communication device 1200, including a processor 1201 and a memory 1202, and 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 is executed by the processor 1201 to implement the various steps of the above-mentioned synchronization signal transmission method embodiment, and can achieve the same technical effect. When the communication device 1200 is a network side device, the program or instruction is executed by the processor 1201 to implement the various steps 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.

[0471] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 3 The steps of the synchronization signal transmission method in the method embodiment shown. This terminal embodiment corresponds to the above terminal method embodiment, and each implementation process and implementation method of the above method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Fig.13 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0472] 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 a processor 1310.

[0473] Those skilled in the art will appreciate that the terminal 1300 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 1310 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.13 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0474] It should be understood that in the 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 the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the 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 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.

[0475] 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.

[0476] 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, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 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. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory 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.

[0477] The processor 1310 may include one or more processing units; optionally, the processor 1310 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 1310.

[0478] Among them, the radio frequency unit 1301 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, wherein the first type of synchronization signal is a synchronization signal sent through a single sending 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 a measurement result of the synchronization signal.

[0479] 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 sending 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.

[0480] 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 a TRP cluster, the reliability and success rate of the terminal's access to the network are improved by receiving multiple types of synchronization signals.

[0481] 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.

[0482] The present application embodiment also provides a network side device. Fig.14 As shown, 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).

[0483] Specifically, the network side device 1400 of the embodiment of the present application further includes: instructions or programs stored in the memory 1403 and executable on the processor 1401, and the processor 1401 calls the instructions or programs in the memory 1403 to execute Figure 3 The synchronization signal transmission method shown in the figure achieves the same technical effect and will not be described here to avoid repetition.

[0484] 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.

[0485] 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-transient readable storage medium.

[0486] 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.

[0487] 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.

[0488] 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.

[0489] 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.

[0490] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0491] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0492] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A synchronization signal transmission method, It is characterized in that include: 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 BWPb of carrier f on serving cell C; PL b,f,c It is the path loss of the activated ULBWPb 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 BWPb of carrier f on serving cell C; PL b,f,c It is the path loss of the activated UL BWPb of carrier f obtained based on the DL RS associated with 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that include: 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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 according to claim 20, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, wherein 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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.

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