Wireless communication method, terminal device, and network device

Abstract

Provided are a wireless communication method, a terminal device, and a network device. The wireless communication method comprises: a terminal device detects a synchronization signal sent by a network device; and when detecting a first synchronization signal, the terminal device determines, on the basis of the first synchronization signal, at least one antenna port associated with the first synchronization signal.

Description

Wireless communication method, terminal device and network device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal equipment, and network equipment. Background Art

[0002] With the advancement of communication technology, communication systems are placing higher demands on wireless network coverage. To address this, some communication systems are considering introducing distributed antenna systems (DAS) to quickly and flexibly build wireless networks that meet user needs. However, how terminal devices and network equipment establish communication connections in DAS scenarios is currently unclear.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method, terminal device, and network device. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, including: a terminal device detecting a synchronization signal sent by a network device; after the terminal device detects a first synchronization signal, the terminal device determines at least one antenna port associated with the first synchronization signal based on the first synchronization signal.

[0006] In a second aspect, a method for wireless communication is provided, comprising: a network device sending a synchronization signal; wherein the synchronization signal comprises a first synchronization signal, and the first synchronization signal is used to determine at least one antenna port associated with the first synchronization signal.

[0007] In a third aspect, a terminal device is provided, comprising: a first detection module for detecting a synchronization signal sent by a network device; and a first determination module for determining at least one antenna port associated with the first synchronization signal based on the first synchronization signal after the terminal device detects the first synchronization signal.

[0008] In a fourth aspect, a network device is provided, comprising: a first sending module, configured to send a synchronization signal; wherein the synchronization signal comprises a first synchronization signal, and the first synchronization signal is used to determine at least one antenna port associated with the first synchronization signal.

[0009] In a fifth aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0010] In the sixth aspect, a network device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the network device executes part or all of the steps in the method of the second aspect.

[0011] In a seventh aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0012] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a computer to execute part or all of the steps in the methods of the above aspects.

[0013] In a ninth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a computer to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0014] In a tenth aspect, an embodiment of the present application provides a computer program, which can be operated to enable a computer to execute part or all of the steps in the methods of the above aspects.

[0015] In the eleventh aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0016] In an embodiment of the present application, the terminal device can determine the antenna port associated with the first synchronization signal based on the detected first synchronization signal, which is beneficial for the terminal device to subsequently establish a connection with the network device on the antenna port associated with the first synchronization signal, thereby facilitating the improvement of data transmission throughput and the improvement of communication reliability and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 1A-1C are diagrams illustrating system architecture examples of wireless communication systems to which embodiments of the present application may be applied.

[0018] 2A-2C are diagrams illustrating system architecture examples of wireless communication systems to which embodiments of the present application may be applied.

[0019] FIG3 is an example diagram of the mapping relationship between SSB and RO.

[0020] FIG4 is a flow chart of a four-step random access process.

[0021] FIG5 is a flow chart of a two-step random access process.

[0022] FIG6 is a flowchart of a wireless communication method provided in an embodiment of the present application.

[0023] FIG7 is a schematic flow chart of a wireless communication method provided in another embodiment of the present application.

[0024] FIG8 is a flowchart of a wireless communication method provided in yet another embodiment of the present application.

[0025] FIG9 is a schematic diagram of a network structure based on a distributed antenna system provided in an embodiment of the present application.

[0026] FIG10 is a schematic diagram of a network structure based on a distributed antenna system provided in another embodiment of the present application.

[0027] FIG11 is a schematic diagram of synchronization signal transmission provided in an embodiment of the present application.

[0028] FIG12 is a schematic diagram of synchronization signal transmission provided by another embodiment of the present application.

[0029] FIG13 is a schematic diagram of the structure of the terminal device provided in an embodiment of the present application.

[0030] FIG14 is a schematic diagram of the structure of the network device provided in an embodiment of the present application.

[0031] FIG15 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] Communication system architecture

[0033] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, advanced long term evolution (LTE-A) system, new radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum (LTE-U) system on unlicensed spectrum, NR-based access to unlicensed spectrum (NR-U) system on unlicensed spectrum, non-terrestrial networks (NTN) system, universal mobile telecommunication system (UMTS), wireless local area networks (WLAN), wireless fidelity (WLAN), etc. fidelity (WiFi), fifth-generation communication (5G) systems or other communication systems, such as future communication systems, such as sixth-generation communication (6G) systems, and satellite communication systems.

[0034] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0035] The communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0036] The communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as a dedicated spectrum.

[0037] The embodiments of the present application can be applied to NTN systems as well as terrestrial networks (TN) systems. As an example and not a limitation, NTN systems include NR-based NTN systems and IoT-based NTN systems.

[0038] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, where the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0039] In an embodiment of the present application, the terminal device may be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a next-generation communication system such as a terminal device in an NR network, or a terminal device in a future-evolved public land mobile network (PLMN) network, etc.

[0040] In an embodiment of the present application, a terminal device may be a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device with wireless connection capabilities, an in-vehicle device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, a UE may be used to act as a base station. For example, a UE may act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. Cellular phones and smart home devices communicate with each other without relaying the communication signal through a base station.

[0041] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0042] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0043] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem or chip provided in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device-to-device D2D, vehicle-to-everything (V2X), machine-to-machine (M2M) communication device that performs the base station function, a network side device in a 6G network, a device that performs the base station function in a future communication system, etc. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

[0044] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0045] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0046] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0047] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. In some embodiments of the present application, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. In some embodiments of the present application, the network device may also be a base station set up in a location such as land or water.

[0048] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0049] In some embodiments, communication system scenarios may include both TN and NTN. NTN typically uses satellite communications to provide communication services to terrestrial users. Currently, NTN systems include NR-NTN and IoT-NTN systems, and may include other NTN systems in the future. For ease of understanding, the following describes communication scenarios for TN and NTN, respectively, with reference to the accompanying figures.

[0050] For example, Figure 1A is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. As shown in Figure 1A, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or also referred to as a communication terminal device or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices located within the coverage area.

[0051] Figure 1A exemplarily shows a network device and two terminal devices. In some embodiments of the present application, the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0052] For example, FIG1B is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1B , a terminal device 1101 and a satellite 1102 are included, and wireless communication can be performed between the terminal device 1101 and the satellite 1102. The network formed between the terminal device 1101 and the satellite 1102 can also be referred to as an NTN. In the architecture of the communication system shown in FIG1B , the satellite 1102 can have the function of a base station, and the terminal device 1101 and the satellite 1102 can communicate directly. In this system architecture, the satellite 1102 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1102 may be included in the communication system, and each network device 1102 may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0053] For example, FIG1C is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1C , it includes a terminal device 1201, a satellite 1202, and a base station 1203. Wireless communication can be performed between the terminal device 1201 and the satellite 1202, and communication can be performed between the satellite 1202 and the base station 1203. The network formed between the terminal device 1201, the satellite 1202, and the base station 1203 can also be referred to as an NTN. In the architecture of the communication system shown in FIG1C , the satellite 1202 may not have the function of a base station, and the communication between the terminal device 1201 and the base station 1203 needs to be transferred through the satellite 1202. In this system architecture, the base station 1203 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1203 may be included in the communication system, and each network device 1203 may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0054] It should be noted that Figures 1A-1C are only examples of the system to which the present application is applicable. Of course, the method shown in the embodiment of the present application can also be applied to other systems, such as 5G communication systems, LTE communication systems, etc., and the embodiment of the present application does not make specific limitations on this.

[0055] In some embodiments of the present application, the wireless communication system shown in Figures 1A-1C may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but the embodiments of the present application are not limited to this.

[0056] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1A as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function. The network device 110 and the terminal device 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0057] With the development of communication technology, the communication system architecture may also change. For example, in future evolved communication systems such as Beyond 5G (B5G) or 6G, distributed multiple-input multiple-output (Distributed MIMO, also known as distributed antenna system) scenarios and / or massive multiple-input multiple-output (Massive MIMO, also known as massive antenna matrix system) scenarios may be introduced. In some cases, Distributed MIMO and / or Massive MIMO may also support cell-free or terminal-centric (UE-centric) networking scenarios. It should be understood that the above scenarios are applicable to TN and / or NTN. These communication system architectures are exemplarily introduced below in conjunction with Figures 2A-2C.

[0058] For example, FIG2A is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. The system architecture may include one or more of the following: a distributed antenna port (Distributed Antenna Port, Distributed AP, or distributed antenna port cluster), a central processing unit (CPU), and a switch module. As shown in FIG2A , the communication system may include multiple distributed antenna ports (or distributed antenna port clusters), and different distributed antenna ports (or distributed antenna port clusters) are connected to the CPU through a switch module. The terminal device selects a suitable distributed antenna port (or distributed antenna port cluster) to serve it according to its location area. FIG2A exemplarily shows 2 CPUs, 2 switch modules, 10 distributed antenna ports and 1 terminal device. In some embodiments of the present application, the communication system may include other numbers of CPUs, and / or other numbers of switch modules, and / or other numbers of distributed antenna ports (or distributed antenna port clusters), and / or other numbers of terminal devices. The embodiments of the present application are not limited to this.

[0059] Exemplarily, Figure 2B is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application. Please refer to Figure 2B, which includes a terminal device and a satellite cluster, and wireless communication can be carried out between the terminal device and the satellite cluster. The network formed between the terminal device and the satellite cluster can also be referred to as NTN. In the architecture of the communication system shown in Figure 2B, at least one satellite in the satellite cluster (for example, a satellite located in a central position) can have the function of a base station, and the terminal device and the satellite cluster can communicate directly. Under the system architecture, a satellite with a base station function can be referred to as a network device. In some embodiments of the present application, a plurality of satellite clusters may be included in the communication system. In some embodiments, each satellite cluster may include one or more network devices. In some embodiments, each satellite cluster or each network device may include other numbers of terminal devices within its coverage area, and the embodiments of the present application are not limited to this.

[0060] Exemplarily, Figure 2C is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Please refer to Figure 2C, which includes a terminal device, a satellite cluster and a base station. Wireless communication can be carried out between the terminal device and the satellite cluster, and communication can be carried out between the satellite cluster and the base station. The network formed between the terminal device, the satellite cluster and the base station can also be referred to as NTN. In the architecture of the communication system shown in Figure 2C, the satellite cluster may not have the function of a base station, and the communication between the terminal device and the base station needs to be transited by the satellite cluster. Under this system architecture, the base station can be referred to as a network device. In some embodiments of the present application, the communication system may include multiple satellite clusters. In some embodiments, a network device may be associated with one or more satellite clusters. In some embodiments, the communication system may include multiple network devices, and / or each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0061] Initial access process

[0062] To achieve uplink synchronization with network devices, the terminal device can perform an initial access process. The following describes the initial access process using the NR system as an example.

[0063] In the NR system, the initial access process of the terminal device can be completed by detecting the synchronization signal block (synchronization signal / PBCH block, SSB or SS / PBCH block) on the synchronization raster.

[0064] In some embodiments, one SSB may include 4 symbols in the time domain.

[0065] In some embodiments, an SSB may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0066] Exemplarily, an SSB may be transmitted through a discovery signal transmission opportunity window or an SSB transmission opportunity window. The discovery signal transmission opportunity window or the SSB transmission opportunity window occurs periodically, and the period may be configured by the network device through high-level parameters. In some embodiments, the discovery signal transmission opportunity window or the SSB transmission opportunity window may include a set of candidate locations for SSB transmission. A set of SSB transmission opportunities (also referred to as an SSB burst set) may include one or more SSBs. A set of SSB transmission opportunities should complete transmission within one half frame (5ms).

[0067] It should be understood that the physical-layer cell identities determined based on the SSBs transmitted in a group of SSB transmission opportunities are all the same. This is because the physical-layer cell ID is determined based on the PSS sequence and SSS sequence included in the SSB. For the same SSB, the PSS sequence and SSS sequence included are the same, so the physical-layer cell ID determined based on the same SSB is the same.

[0068] Specifically, the PSS included in an SSB includes 3 sequences, and the terminal device determines the SSS includes 336 sequences, and the terminal device determines The physical layer cell ID is determined based on formula (1).

[0069] For the FR1 band, a group of SSB transmission opportunities can contain up to eight SSBs, requiring up to three bits to indicate the indexes of these eight SSBs. As an implementation method, these three bits can be implicitly carried by the demodulation reference signal (DMRS) sequence of the PBCH. There are eight different PBCH DMRS sequences, corresponding to eight different SSB indices.

[0070] For the FR2 band, a maximum of 64 SSBs can be configured in a group of SSB transmission opportunities, and 6 bits are required to indicate the index of these 64 SSBs. As an implementation method, the lower 3 bits of these 6 bits can be carried by the DMRS sequence of the PBCH, and the additional upper 3 bits can be directly indicated by the PBCH payload content.

[0071] Different SSBs can be indicated by different SSB indexes. One of the main functions of the SSB index is to allow the UE to obtain system timing information. In addition, the SSB index has another function, which is to indicate the quasi co-location (QCL) relationship between SSBs. QCL means that the large-scale parameters of the channel experienced by the symbols on a certain antenna port can be inferred from the channel experienced by the symbols on another antenna port. The large-scale parameters may include delay spread, average delay, Doppler spread, Doppler shift, average gain, and spatial reception parameters. In the NR system, considering the possible QCL relationship between various reference signals, the above-mentioned large-scale channel parameters can be divided into different QCL types, which facilitates the system to be configured according to different scenarios where the terminal equipment is located. For example, the QCL type in the NR system can include four different QCL types: QCL type A, QCL type B, QCL type C, and QCL type D. The definitions of different QCL type configurations are as follows:

[0072] 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread};

[0073] 'QCL-TypeB': {Doppler shift, Doppler spread};

[0074] 'QCL-TypeC': {Doppler shift, average delay};

[0075] 'QCL-TypeD': {spatial Rx parameter}.

[0076] Specifically speaking of SSBs, in the 5G NR system, SSBs carried by different beams constitute an SSB burst set. Different SSB indices correspond to different SSB time domain position information within the burst set, and also correspond to specific SSB transmission beam information. SSBs with the same SSB index can be considered to have a QCL relationship, and the corresponding types are 'QCL-TypeA' and 'QCL-TypeD'; in other words, SSBs with the same SSB index experience the same or similar large-scale parameters of the channel, including Doppler shift, Doppler spread, average delay, delay spread, and spatial reception parameters. The UE can assume that the network device uses the same beam to transmit these SSBs; SSBs corresponding to different SSB indices are not considered to have a QCL relationship, because they may come from different transmission beams of the network device and experience different channel transmission characteristics.

[0077] During the initial access process, the terminal device attempts to search for the SSB through the predefined possible time-frequency positions of the SSB, and then obtains time and frequency synchronization, radio frame timing, and cell ID (such as physical layer cell ID) through the detected SSB. The network device will indicate the SSB actually sent in an SSB burst set through, for example, indication information in a system message. Accordingly, after accessing the network, the terminal device can determine the SSB actually sent in an SSB burst set through the indication information sent by the network device.

[0078] In some embodiments, when receiving a physical downlink shared channel (PDSCH), the terminal device should perform rate matching on candidate positions that may be used to transmit an SSB. That is, if the terminal device receives scheduling information indicating that a first PDSCH is to be received on a first time-frequency resource, and the second time-frequency resource included in the first time-frequency resource is used to transmit an SSB or the second time-frequency resource may be used to transmit an SSB, the terminal device should assume that the second time-frequency resource is not used for PDSCH transmission. The unit of the resource unit included in the second time-frequency resource may be a resource element (RE) or a physical resource block (PRB).

[0079] In some embodiments, the terminal device may also obtain resource configuration during the random access process based on the received cell system message. Random access is a very important process during the initial access process. In addition to completing functions such as establishing a radio resource control (RRC) connection, maintaining uplink synchronization, and cell handover, the random access process also undertakes functions such as beam management and system message request.

[0080] The resource configuration in the random access process may include physical random access channel (PRACH) resource configuration, also known as PRACH transmission opportunity (RO). RO is the time-frequency resource that carries the random access preamble sequence (Preamble). If the UE supports two-step RACH transmission, the resource configuration in the random access process may also include physical uplink shared channel (PUSCH) resource configuration, also known as PUSCH transmission opportunity (PO). Among them, message A (MsgA) in the two-step RACH includes MsgA Preamble and MsgA PUSCH, RO is the time-frequency resource used to carry MsgA Preamble, and PO is the time-frequency resource used to carry MsgA PUSCH.

[0081] The NR system features support for downlink multi-beams. Before a network device communicates with a terminal device, it needs to know the terminal device's beam so it can set the appropriate beam direction for subsequent data transmission. Since the PRACH during random access is the first message sent by the terminal device to the network device, the PRACH can be used to report the terminal device's beam. As an implementation method, the terminal device's beam can be determined by mapping the SSB to the RO.

[0082] In the NR system, the following mapping ratios between SSBs and ROs are supported: 1) one-to-one mapping; 2) many-to-one mapping; and 3) one-to-many mapping. Figure 3 shows a schematic diagram of the mapping relationship between SSBs and ROs, where the SSB is on the initial bandwidth part (BWP) of the downlink and the RO is on the initial BWP of the uplink. For example, the SSB is on the downlink BWP#0 in Figure 3, and the RO is on the uplink BWP#0 in Figure 3. In the example of Figure 3, SSBs and ROs of the same shape indicate a mapping relationship. For example, SSB#0 is mapped to RO#0, SSB#1 is mapped to RO#1, and so on.

[0083] Before the terminal device initiates random access, the terminal device will measure and evaluate the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, after determining the SSB with the strongest or stronger signal (for example, the terminal device determines that SSB#1 is the SSB with the strongest signal), the terminal device can determine the RO corresponding to the SSB with the strongest or stronger signal based on the mapping relationship between SSB and RO, and send the preamble on the RO. Taking the case where the terminal device determines that SSB#1 is the SSB with the strongest signal as an example, the terminal device can determine that the PRACH transmission opportunity corresponding to SSB#1 is RO#1 based on the mapping relationship between SSB and RO, and send the preamble on RO#1. Afterwards, if the network device successfully receives the preamble, the network device can obtain the SSB selected by the terminal device based on the resource information of the successful reception of the preamble. For example, the network device can determine that the preamble is associated with SSB#1 based on the association relationship, so that the beam information corresponding to the subsequent communication can be determined based on SSB#1.

[0084] For ease of understanding, the processes of the four-step random access process and the two-step random access process are respectively introduced below with reference to FIG4 and FIG5 .

[0085] Figure 4 is a flow chart of a four-step random access process. As shown in Figure 4, the four-step random access process may include steps S410 to S440.

[0086] In step S410 (the first step), the terminal device sends a random access preamble sequence (Preamble, also called message 1, Msg1, etc.) to the network device on the PRACH resource on the uplink initial BWP.

[0087] In step S420 (second step), after detecting Msg1, the network device sends a PDCCH scrambled with a random access radio network temporary identifier (RA-RNTI) to the terminal device. The PDCCH can be sent through resources in the Type1-PDCCH common search space (CSS) on the downlink initial BWP. The PDSCH scheduled by the PDCCH may include a random access response (RAR, also known as message 2, Msg2, etc.) corresponding to the preamble sent by the terminal device.

[0088] Accordingly, the terminal device uses the RA-RNTI to detect the PDCCH on the Type 1-PDCCH CSS on the downlink initial BWP. After detecting the PDCCH, the terminal device determines whether the RAR sent to it by the network device is included based on the PDSCH scheduled by the PDCCH. The RAR may include information such as the uplink authorization of message 3 (Msg3), the timing advance command (TA command), and the temporary RNTI (TC-RNTI). In some embodiments, the Type 1-PDCCH CSS is configured by the network device through system messages and / or higher-layer parameters.

[0089] In step S430 (step 3), after receiving the RAR, the terminal device sends message 3 (Msg3) on the uplink resource indicated by the RAR. In some embodiments, this step supports HARQ retransmission. That is, if the network device does not correctly receive Msg3, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg3. The PDCCH can carry DCI format 0_0.

[0090] In step S440 (the fourth step), the network device sends a message 4 (Msg4) to the terminal device, which includes a contention resolution message. In some embodiments, this step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device may use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg4. The PDCCH may carry DCI format 1_0. If the terminal device correctly receives Msg4 and determines that the Msg4 is a message for the terminal device, the random access process of the terminal device is successful, otherwise the random access process fails. The terminal device needs to initiate the random access process again from the first step.

[0091] Figure 5 is a schematic flow chart of a two-step random access process. As shown in Figure 5, the two-step random access process may include step S510 and step S520.

[0092] In step S510 (first step), the terminal device sends a message A (MsgA) to the network device on the RO and PO on the uplink initial BWP, where the MsgA includes the MsgA Preamble and the MsgA PUSCH.

[0093] In step S520 (second step), after detecting MsgA, the network device sends a PDCCH encrypted with MsgB-RNTI to the terminal device through the resources in the Type1-PDCCH CSS on the downlink initial BWP. The PDSCH scheduled by the PDCCH may include a random access response (also called message B, MsgB, etc.) corresponding to the MsgA sent by the terminal device.

[0094] If the network device only detects the MsgA Preamble and does not receive the MsgA PUSCH, the PDSCH scheduled by the PDCCH may include the fallback RAR corresponding to the MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses the MsgB-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the downlink initial BWP, and after detecting the PDCCH, determines whether the PDSCH scheduled by the PDCCH includes the success RAR (successRAR) or fallback RAR sent by the network device to itself.

[0095] If the terminal device correctly receives the successful RAR, the terminal device will feedback ACK information to the network device, and the random access process of the terminal device will be successful. Alternatively, if the terminal device receives a fallback RAR, the terminal device will send Msg3 on the uplink resource indicated by the fallback RAR after receiving the fallback RAR, and the two-step random access process will fall back to the four-step random access process. Alternatively, if the terminal device does not receive any RAR, the random access process fails, and the terminal device needs to initiate the random access process again from the first step.

[0096] As mentioned earlier, with the advancement of communication technologies, communication systems are placing higher demands on wireless network coverage. Some communication systems (such as B5G and 6G systems, which are evolving into future generations) are considering introducing distributed antenna systems (DAS) to quickly and flexibly build wireless networks that meet user needs. However, how terminal devices and network equipment establish communication connections in DAS scenarios is currently unclear.

[0097] In response to the above problems, an embodiment of the present application provides a wireless communication method, terminal device and network device, so that the terminal device can determine the antenna port associated with the first synchronization signal based on the detected first synchronization signal, which is beneficial for the terminal device to subsequently establish a connection with the network device on the antenna port associated with the first synchronization signal, thereby facilitating the improvement of data transmission throughput and the improvement of communication reliability and efficiency.

[0098] Before introducing the technical solutions of the embodiments of the present application, for ease of understanding, relevant concepts of the distributed antenna system involved in the embodiments of the present application are first introduced.

[0099] In embodiments of the present application, a channel or signal may be transmitted via an antenna port (AP). For example, a channel or signal between a network device and a terminal device may be transmitted via an AP. Typically, taking data transmission as an example, one antenna port may be used to transmit one data stream. Communication between a network device and a terminal device may be performed via one or more antenna ports.

[0100] In some embodiments, an antenna port may correspond to one or a group of physical antennas.

[0101] In some embodiments, the relationship between multiple antenna ports used to transmit communications between a network device and a terminal device may be distributed antenna ports. For example, at least two antenna ports among the multiple antenna ports are distributed antenna ports; or any two antenna ports among the multiple antenna ports are distributed antenna ports.

[0102] Taking distributed antenna ports as an example, in some embodiments, multiple antenna ports or multiple antenna port sets (antenna port clusters) used for communication transmission can be geographically separated, or in other words, the channels or signals transmitted by the multiple antenna ports or multiple antenna port sets used for communication transmission do not have a QCL relationship.

[0103] In some embodiments, the fact that channels or signals transmitted by multiple antenna ports used for communication transmission do not have a QCL relationship may include: channels or signals transmitted by at least two of the multiple antenna ports do not have a QCL relationship, or channels or signals transmitted by any two of the multiple antenna ports do not have a QCL relationship. In other words, the characteristics of the distributed antenna ports may include: channels or signals transmitted by at least two of the multiple antenna ports do not have a QCL relationship, or channels or signals transmitted by any two of the multiple antenna ports do not have a QCL relationship.

[0104] Taking the QCL relationship associated with the distributed antenna port as the first QCL relationship as an example, in some embodiments, the characteristics of the distributed antenna port may include: the channels or signals transmitted through at least two antenna ports among the multiple antenna ports do not have the first QCL relationship, or the channels or signals transmitted through any two antenna ports among the multiple antenna ports do not have the first QCL relationship.

[0105] The embodiments of the present application do not limit the large-scale channel parameters associated with the first QCL relationship type. For example, the large-scale channel parameters associated with the first QCL relationship type may include one of the following: {Doppler shift, Doppler spread, average delay, delay spread}; {Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameter}; {Doppler shift, Doppler spread}; {Doppler shift, Doppler spread, spatial reception parameter}; {Doppler shift, average delay}; {Doppler shift, average delay, spatial reception parameter}; and {spatial reception parameter}.

[0106] In some embodiments, the relationship between multiple antenna ports used to transmit communications between the network device and the terminal device may be centralized antenna ports. For example, any two antenna ports among the multiple antenna ports are centralized antenna ports.

[0107] Taking centralized antenna ports as an example, in some embodiments, channels or signals transmitted by multiple antenna ports or multiple antenna port sets used for communication transmission have a QCL relationship. For example, channels or signals transmitted by any two antenna ports among the multiple antenna ports used for communication transmission have a QCL relationship.

[0108] Taking the QCL relationship associated with the centralized antenna port as the second QCL relationship as an example, in some embodiments, the characteristics of the centralized antenna port may include: channels or signals transmitted by any two antenna ports among the multiple antenna ports have the second QCL relationship.

[0109] The embodiments of the present application do not limit the large-scale channel parameters associated with the second QCL relationship type. For example, the large-scale channel parameters associated with the second QCL relationship type may include one of the following: {Doppler shift, Doppler spread, average delay, delay spread}; {Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameter}; {Doppler shift, Doppler spread}; {Doppler shift, Doppler spread, spatial reception parameter}; {Doppler shift, average delay}; {Doppler shift, average delay, spatial reception parameter}; and {spatial reception parameter}.

[0110] In some embodiments, the first QCL relationship type and the second QCL relationship type are associated with the same large-scale channel parameters. For example, the large-scale channel parameters associated with the first QCL relationship type and the second QCL relationship type are both {Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameter}.

[0111] In some embodiments, the first QCL relationship type and the second QCL relationship type are associated with different large-scale channel parameters. For example, the large-scale channel parameters associated with the first QCL relationship type are {Doppler shift, average delay, spatial reception parameter}, and the large-scale channel parameters associated with the second QCL relationship type are {Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameter}.

[0112] In some embodiments, a network for wireless communication may include one or more antenna port sets, which may also be referred to as antenna port clusters. An antenna port set may include one or more antenna ports, and one or more antenna ports in the antenna port set may be used to transmit channels or signals, such as transmitting communication signals between a network device and a terminal device.

[0113] In some embodiments, an antenna port set may be a distributed antenna port set, or in other words, an antenna port set includes multiple antenna ports, wherein the multiple antenna ports include at least two antenna ports that do not have a first QCL relationship. For example, at least two antenna ports included in an antenna port set do not have the first QCL relationship, or any two antenna ports included in an antenna port set do not have the first QCL relationship.

[0114] In some embodiments, an antenna port set may be a centralized antenna port set, or in other words, the antenna ports included in an antenna port set have a second QCL relationship. For example, any two antenna ports included in an antenna port set have a second QCL relationship.

[0115] In some embodiments, an antenna port set may include multiple antenna ports that are geographically close to each other. Optionally, the multiple antenna ports may be distributed antenna ports; or the multiple antenna ports may be centralized antenna ports; or some of the multiple antenna ports may be distributed antenna ports and some may be centralized antenna ports.

[0116] It should be understood that in an embodiment of the present application, the communication network may include one or more antenna ports, and the channel or signal may be transmitted through one or more antenna ports; or, the communication network may include one or more antenna port sets, and the channel or signal may be transmitted through one or more antenna port sets.

[0117] It should be understood that in the embodiments of the present application, the frequency resources used for channel or signal transmission may be referred to as carriers. For example, the frequency resources used for downlink channel or signal transmission may be referred to as downlink carriers, and the frequency resources used for uplink channel or signal transmission may be referred to as uplink carriers. The embodiments of the present application do not limit the frequency resources contained in the carrier. For example, the carrier may include a continuous frequency resource for channel or signal transmission; or, the carrier may include multiple discontinuous frequency resources for channel or signal transmission. The embodiments of the present application do not limit the units of the frequency resources contained in the carrier. As an example and not a limitation, the units of the frequency resources may be resource blocks, resource elements, etc.

[0118] It should be understood that in an embodiment of the present application, the carrier and the cell may not have an associated relationship, for example, the carrier is not associated with the cell; or, the carrier and the cell may have an associated relationship, for example, "downlink carrier" can be replaced with "downlink cell" and "uplink carrier" can be replaced with "uplink cell".

[0119] From the above description, it can be seen that in a distributed antenna system, multiple antenna ports or multiple antenna port sets used for communication transmission are geographically separated, or in other words, multiple antenna ports or multiple antenna port sets used for communication transmission do not have a QCL relationship. In addition, the concept of cells may no longer exist in future communication systems. Then, as a possible implementation method, the terminal device can select one or more antenna ports (or antenna port sets) that are closer to itself to serve itself based on its geographical location, thereby achieving better data transmission throughput. However, in these scenarios, how to establish a communication connection between the terminal device and the network device is a problem that needs to be solved.

[0120] Based on the above introduction to concepts such as distributed antenna systems and distributed antenna ports, the following describes the method embodiments of the present application. It should be noted that the present embodiments do not limit the application scenarios of the technical solutions of the present application. For example, the present application can be applied to the initial access process of a terminal device, such as the four-step random access process or the two-step random access process. Alternatively, the present embodiments can be applied to TN scenarios or NTN scenarios.

[0121] Figure 6 is a flow chart illustrating a wireless communication method according to an embodiment of the present application. The method illustrated in Figure 6 is described from the perspective of interaction between a terminal device and a network device. The terminal device and network device may be, for example, any of the terminal devices and network devices described in Figures 1A-1C , or any of the terminal devices and network devices described in Figures 2A-2C .

[0122] The method shown in Figure 6 may include step S610. In step S610, the terminal device detects a synchronization signal sent by the network device.

[0123] The network device may send one or more synchronization signals, and accordingly, the terminal device may detect the one or more synchronization signals sent by the network device, so as to perform subsequent operations according to the detected synchronization signals, such as performing random access.

[0124] In some embodiments, the synchronization signal sent by the network device may include a synchronization signal block (SSB), or in other words, the network device may send a synchronization signal to the terminal device in the form of an SSB, so that the terminal device performs uplink synchronization according to the SSB. However, the embodiments of the present application are not limited thereto. In some embodiments, the synchronization signal sent by the network device may be in a form other than SSB, as long as the synchronization signal is used for uplink synchronization of the terminal device. For example, the synchronization signal may be a synchronization signal such as PSS or SSS, or the synchronization signal may be a synchronization signal with other names.

[0125] That is to say, in the embodiment of the present application, the synchronization signal sent by the network device may be the same as the synchronization signal block or synchronization signal in the existing system, or may be different from the synchronization signal block or synchronization signal in the existing system. The embodiment of the present application is not limited to this.

[0126] In some embodiments, the synchronization signal (one or more synchronization signals) sent by the network device may include a first synchronization signal. The first synchronization signal may be any one or more synchronization signals among the synchronization signals sent by the network device.

[0127] In some embodiments, the first synchronization signal may include the synchronization signal with the strongest received signal strength detected by the terminal device. For example, if the synchronization signals detected by the terminal device include SSB 0, SSB 1, and SSB 2, and the received signal strength of SSB 1 is the strongest, then the first synchronization signal may include SSB 1.

[0128] In some embodiments, the first synchronization signal may include a synchronization signal whose received signal strength detected by the terminal device exceeds a certain threshold. For example, the first synchronization signal may include a synchronization signal whose received signal strength detected by the terminal device exceeds -50dBm. Assuming that the synchronization signals detected by the terminal device include SSB 0, SSB 1, and SSB 2, where the received signal strengths of SSB 0 and SSB 1 exceed the threshold (e.g., -50dBm), the first synchronization signal may include SSB 0 and SSB 1.

[0129] In some embodiments, the first synchronization signal is sent based on an association relationship between the synchronization signal and the antenna port.

[0130] In some embodiments, the first synchronization signal may be used to determine at least one antenna port associated with the first synchronization signal. For example, the terminal device may determine at least one antenna port associated with the first synchronization signal based on the detected first synchronization signal.

[0131] As an implementation method, the terminal device and / or the network device may determine at least one antenna port associated with the first synchronization signal based on the association relationship between the synchronization signal and the antenna port. That is, there may be an association relationship (or mapping relationship, corresponding relationship, etc.) between the synchronization signal and the antenna port, and the terminal device and / or the network device may determine the antenna port associated with a certain synchronization signal based on the association relationship, or determine the synchronization signal associated with a certain antenna port. A detailed description of the association relationship between the synchronization signal and the antenna port can be found later and will not be repeated here.

[0132] Taking the example of a terminal device detecting a first synchronization signal and determining its associated antenna port based on the first synchronization signal, in some embodiments, referring to Figure 6 , the method provided in the embodiment of the present application may further include step S620, which is an optional step.

[0133] In step S620, after detecting the first synchronization signal, the terminal device determines at least one antenna port associated with the first synchronization signal based on the first synchronization signal. In other words, the at least one antenna port associated with the first synchronization signal can be explicitly or implicitly determined (or indicated) by the first synchronization signal.

[0134] As an implementation manner, determining, according to the first synchronization signal, at least one antenna port associated with the first synchronization signal may include determining, according to the first synchronization signal, an identifier of the at least one antenna port associated with the first synchronization signal.

[0135] The embodiments of the present application do not specifically limit the implementation method for determining at least one antenna port associated with the first synchronization signal based on the first synchronization signal. For example, the identifier of the at least one antenna port associated with the first synchronization signal can be determined based on one or more of the following information: an index of the first synchronization signal, a synchronization signal sequence corresponding to the first synchronization signal, and information transmitted in a downlink channel associated with the first synchronization signal.

[0136] As an example, the identifier of at least one antenna port associated with the first synchronization signal can be determined based on the index of the first synchronization signal. For example, when the association relationship between the synchronization signal and the antenna port is indicated by the index of the synchronization signal and the identifier of the antenna port, the identifier of at least one antenna port associated with the first synchronization signal can be determined based on the index of the first synchronization signal and the association relationship. Assuming that the index of the first synchronization signal is x0, the identifier of the at least one antenna port determined based on the index of the first synchronization signal may be x0, and of course it may be other identifiers, as long as the identifier is determined based on the index of the first synchronization signal.

[0137] As another example, the identifier of at least one antenna port associated with the first synchronization signal can be determined based on the synchronization signal sequence corresponding to (associated with) the first synchronization signal. The embodiment of the present application does not limit the type of the synchronization signal sequence corresponding to the first synchronization signal. Exemplarily, the synchronization signal sequence corresponding to the first synchronization signal may include a primary synchronization signal sequence and / or a secondary synchronization signal sequence. In this case, the identifier of at least one antenna port associated with the first synchronization signal is determined based on the synchronization signal sequence of the first synchronization signal and may include one or more of the following: the identifier of at least one antenna port associated with the first synchronization signal is determined based on the primary synchronization signal sequence and the secondary synchronization signal sequence of the first synchronization signal; the identifier of at least one antenna port associated with the first synchronization signal is determined based on the primary synchronization signal sequence of the first synchronization signal; and the identifier of at least one antenna port associated with the first synchronization signal is determined based on the secondary synchronization signal sequence of the first synchronization signal. As a specific implementation method, the identifier of at least one antenna port associated with the first synchronization signal can be determined based on the synchronization signal sequence ID of the first synchronization signal, for example, based on the primary synchronization signal sequence ID and the secondary synchronization signal sequence ID of the first synchronization signal; or based on the primary synchronization signal sequence ID of the first synchronization signal; or based on the secondary synchronization signal sequence ID of the first synchronization signal, etc.

[0138] As another example, the identifier of at least one antenna port associated with the first synchronization signal can be determined according to the index of the first synchronization signal, information transmitted in the downlink channel associated with the first synchronization signal, and so on.

[0139] In some embodiments, the transmission position of the first synchronization signal is predefined. For example, the transmission position of the first synchronization signal is predefined in N time units, where N is a positive integer.

[0140] The embodiments of the present application do not limit the specific length of the N time units. In some embodiments, the N time units may be a radio frame. In some embodiments, the N time units may be a synchronization signal transmission period. In other words, the transmission position of the first synchronization signal may be predefined within a radio frame or a synchronization signal transmission period.

[0141] The embodiments of the present application do not limit the units of time units. In some embodiments, the units of time units mentioned in the embodiments of the present application may be milliseconds, seconds, microseconds, etc. In some embodiments, the time units mentioned in the embodiments of the present application may be frames, half frames, time slots, symbols, etc. In some embodiments, the time units mentioned in the present application may be time units determined according to subcarrier spacing, for example, time units determined according to specific subcarriers (such as the subcarrier spacing of synchronization signals) or predefined subcarrier spacing.

[0142] In some embodiments, the terminal device can determine the boundary of the N time units based on the detected first synchronization signal. Taking the N time units as a radio frame as an example, assuming that the length of a radio frame includes N time units, starting from the first time unit in the N time units, each time unit includes 2 synchronization signals (such as SSBs). When the terminal device searches for SSB 0 or SSB 1, it can be determined that the time unit carrying SSB 0 or SSB 1 is the first time unit in a radio frame, thereby determining the boundary of the radio frame and obtaining the radio frame timing.

[0143] In some embodiments, the at least one antenna port associated with the first synchronization signal may be determined based on predefined or preconfigured information. For example, the at least one antenna port associated with the first synchronization signal may be determined based on a predefined or preconfigured association relationship, which may be used to indicate an association relationship between the synchronization signal and the antenna port.

[0144] In an embodiment of the present application, the terminal device can determine the antenna port associated with the first synchronization signal based on the detected first synchronization signal, which is beneficial for the terminal device to subsequently establish a connection with the network device on the antenna port associated with the first synchronization signal, thereby facilitating the improvement of data transmission throughput and the improvement of communication reliability and efficiency.

[0145] Figure 7 is a flow chart of a wireless communication method provided by another embodiment of the present application. The method shown in Figure 7 may include steps S710 and S720, which are described below.

[0146] In step S710, the terminal device detects a synchronization signal sent by the network device. For example, the terminal device detects one or more synchronization signals sent by the network device. The one or more synchronization signals sent by the network device include a first synchronization signal, which can be one or more synchronization signals detected by the terminal device.

[0147] For a detailed description of step S710, please refer to the previous description of step S610, which will not be repeated here for the sake of brevity.

[0148] In step S720, the terminal device sends a random access signal through at least one random access transmission opportunity.

[0149] In some embodiments, at least one random access transmission opportunity for transmitting a random access signal is determined based on an association between the random access transmission opportunity and an antenna port. As an implementation, the terminal device may determine, based on a detected first synchronization signal, at least one antenna port associated with the first synchronization signal, and then determine the at least one random access transmission opportunity based on the at least one antenna port associated with the first synchronization signal.

[0150] In some embodiments, at least one random access transmission opportunity for sending a random access signal is determined based on an association between the random access transmission opportunity and a synchronization signal. As an implementation, at least one random access transmission opportunity for sending a random access signal is determined based on a first synchronization signal detected by a terminal device and an association between the random access transmission opportunity and the synchronization signal.

[0151] The association relationship between the random access transmission opportunity and the antenna port, and the association relationship between the random access transmission opportunity and the synchronization signal can be found in the following introduction and will not be described in detail here.

[0152] In some embodiments, the random access signal sent by the terminal device may include, for example, a preamble.

[0153] In some embodiments, the random access signal sent by the terminal device may include, for example, a preamble and uplink information.

[0154] In some embodiments, if the first synchronization signal detected or determined by the terminal device is a synchronization signal, the terminal device may initiate random access through the random access transmission opportunity set associated with the antenna port associated with the synchronization signal. For example, the terminal device may initiate random access through the random access transmission opportunity set associated with the antenna port set associated with the synchronization signal; or the terminal device may initiate random access through the random access transmission opportunity set associated with the antenna port associated with the synchronization signal.

[0155] In some embodiments, if the first synchronization signal detected or determined by the terminal device is a plurality of synchronization signals, the terminal device may initiate random access through at least one random access transmission opportunity set from among a plurality of random access transmission opportunity sets associated with antenna ports associated with the plurality of synchronization signals. For example, the terminal device may initiate random access through at least one random access transmission opportunity set from among a plurality of random access transmission opportunity sets associated with a plurality of antenna port sets associated with the plurality of synchronization signals; or the terminal device may initiate random access through at least one random access transmission opportunity set from among a plurality of random access transmission opportunity sets associated with a plurality of antenna ports associated with the plurality of synchronization signals.

[0156] 7 , in some embodiments, the method provided in the embodiment of the present application may further include step S730. In step S730, the network device sends a random access response to the terminal device.

[0157] In some embodiments, the random access response is a response to a random access signal sent by the terminal device.

[0158] In some embodiments, the random access response is sent by the network device via at least one antenna port associated with the first synchronization signal. In some embodiments, the random access response may be sent by the network device via an antenna port in an antenna port set to which the at least one antenna port associated with the first synchronization signal belongs.

[0159] Figure 8 is a flow chart of a wireless communication method provided by another embodiment of the present application. The method shown in Figure 8 may include steps S810 and S820, which are described below.

[0160] In step S810, the terminal device detects a synchronization signal sent by the network device. For example, the terminal device detects one or more synchronization signals sent by the network device. The one or more synchronization signals sent by the network device include a first synchronization signal, which can be one or more synchronization signals detected by the terminal device.

[0161] For a detailed description of step S810, please refer to the previous description of step S610, which will not be repeated here for the sake of brevity.

[0162] In step S820, the terminal device sends indication information (such as the third indication information mentioned below) to the network device. The indication information is used to determine (or indicate) the antenna port selected by the terminal device and / or the synchronization signal selected by the terminal device. For example, the indication information can be used to determine M antenna ports and / or N synchronization signals selected by the terminal device, where N and M are positive integers.

[0163] In some embodiments, the above-mentioned indication information is used to determine the M antenna ports selected by the terminal device, which may include: the above-mentioned indication information may be used to indicate the identifiers of the M antenna ports selected by the terminal device.

[0164] In some embodiments, the M value may be predefined or preconfigured. In some embodiments, the M value may be determined based on a threshold value (such as a third threshold value), which may be predefined or preconfigured.

[0165] In some embodiments, the M antenna ports selected by the terminal device can be M antenna ports with signal strengths ranging from strong to weak, that is, the M antenna ports selected by the terminal device can be the M antenna ports with the strongest signal strengths among the multiple antenna ports associated with the terminal device.

[0166] In some embodiments, the M antenna ports selected by the terminal device may be M antenna ports that are greater than or equal to a certain threshold value (such as a third threshold value). In other words, the number of M is determined according to the threshold value.

[0167] In some embodiments, if the number of antenna ports determined by the terminal device is less than M, the indication bit may be a preset value or a filler value.

[0168] In some embodiments, the threshold value (such as the third threshold value) used to determine M may be a value indicating signal strength. For example, the threshold value may be a signal strength greater than -50 dBm.

[0169] In some embodiments, the above-mentioned indication information is used to determine the N synchronization signals selected by the terminal device, which may include: the above-mentioned indication information may be used to indicate the index of the N synchronization signals selected by the terminal device.

[0170] In some embodiments, the N value may be predefined or preconfigured. In some embodiments, the N value may be determined based on a threshold value (such as a fourth threshold value), which may be predefined or preconfigured.

[0171] In some embodiments, the N synchronization signals selected by the terminal device may be N synchronization signals with received signal strengths ranging from strong to weak, that is, the N synchronization signals selected by the terminal device may be the N synchronization signals with the strongest signal strengths detected by the terminal device.

[0172] In some embodiments, the N synchronization signals selected by the terminal device may be N synchronization signals greater than or equal to a certain threshold value (eg, a fourth threshold value). In other words, the number N is determined according to the threshold value.

[0173] In some embodiments, if the number of synchronization signals determined by the terminal device is less than N, the indication bit may be a preset value or a filler value.

[0174] In some embodiments, the threshold value (eg, the fourth threshold value) used to determine N may be a value indicating received signal strength. For example, the threshold value may be a received signal strength greater than -50 dBm.

[0175] The embodiment of the present application does not specifically limit the manner in which the indication information in step S820 is carried. For example, the indication information may be carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, or an uplink transmission after the random access process is completed.

[0176] As an example, the indication information may be carried in a preamble. As another example, the indication information may be carried in Msg3. As yet another example, the indication information may be carried in Msg5 after the random access procedure is completed. As yet another example, the indication information may be carried in uplink scheduling after the random access procedure is completed. As yet another example, the indication information may be carried in uplink information in a two-step random access procedure, etc.

[0177] In some embodiments, before detecting the synchronization signal sent by the terminal device, the terminal device may attempt to search for the synchronization signal based on predefined possible time-frequency positions of the synchronization signal.

[0178] In some embodiments, after the terminal device detects the first synchronization signal, it can obtain time and frequency synchronization and timing based on the detected first synchronization signal, and determine at least one antenna port associated with the first synchronization signal.

[0179] It should be noted that the processes of the wireless communication methods mentioned in the above embodiments can be combined, such as partially or completely, and the embodiments of the present application are not limited to this. For example, the wireless communication method provided in the embodiments of the present application may include the above steps S610, S620, and S720. Alternatively, the wireless communication method provided in the embodiments of the present application may include the above steps S610, S720, and S820.

[0180] It should also be noted that, after combining the steps of various embodiments, the embodiments of the present application do not specifically limit the order in which the steps are executed. For example, if the wireless communication method includes steps S610, S620, and S720 described above, step S720 may be executed after step S620. If the wireless communication method includes steps S610, S720, and S820 described above, step S820 may be executed after step S720, before step S720, or simultaneously with step S720.

[0181] The above describes the steps of the wireless communication method. The following describes in detail the various relationships involved in the embodiments of this application. The relationships mentioned below are related to the architecture of the distributed antenna system. In other words, the relationships mentioned in the embodiments of this application may vary under different distributed antenna system architectures. To facilitate understanding, the following first describes the architectures of two distributed antenna systems involved in the embodiments of this application.

[0182] Figure 9 is a schematic diagram of a network structure based on a distributed antenna system provided by an embodiment of the present application. In the network shown in Figure 9, the communication network includes one or more antenna port sets. As an example and not a limitation, Figure 9 illustrates an example in which two antenna port sets are included in the communication network. As an example, the communication network includes antenna port set 0 and antenna port set 1, and each antenna port set includes multiple antenna ports within a certain geographical area. The number of antenna ports included in different antenna port sets can be the same or different, and this application does not limit this. In this example, the different antenna ports included in an antenna port set are geographically different, so it can be considered that any two antenna ports in the antenna port set do not have a first QCL relationship, or in other words, the antenna ports included in the antenna port set are distributed antenna ports.

[0183] In some embodiments, the antenna ports included in an antenna port set can be divided into two types: primary antenna ports and secondary antenna ports. The number of primary antenna ports included in an antenna port set can be one or more, and the number of secondary antenna ports included in an antenna port set can also be one or more. By way of example and not limitation, in Figure 9, antenna port set 0 and antenna port set 1 each include one primary antenna port, and all antenna ports other than the primary antenna port are secondary antenna ports.

[0184] Figure 10 is a schematic diagram of another network structure based on a distributed antenna system provided in an embodiment of the present application. In the network shown in Figure 10, the communication network includes one or more antenna ports. As an example and not a limitation, Figure 10 illustrates an example in which 14 antenna ports are included in the communication network. As an example, the communication network includes multiple antenna ports within a certain geographical area. In some embodiments, the number of physical antennas associated with different antenna ports included in the communication network may be the same or different, and this application does not limit this. In this example, the geographical locations of different antenna ports are different, so it can be considered that any two antenna ports do not have a first QCL relationship, or in other words, the antenna ports included in the communication network are distributed antenna ports.

[0185] In some embodiments, the antenna ports included in the communication network shown in Figure 10 do not distinguish between primary antenna ports and secondary antenna ports. However, the embodiments of the present application are not limited thereto. In some embodiments, the antenna ports included in the communication network may also include primary antenna ports and secondary antenna ports.

[0186] The following describes the wireless communication methods involved in the embodiments of the present application under two distributed antenna system architectures, respectively, in conjunction with Example 1 and Example 2. Example 1 can be applied to the network architecture shown in FIG9 , and Example 2 can be applied to the network architecture shown in FIG10 .

[0187] Example 1: Associating synchronization signals with antenna port sets

[0188] To enable a terminal device to access a wireless communication network based on a distributed antenna system, the network device may transmit a synchronization signal through an antenna port in an antenna port set. Taking the communication network shown in FIG9 as an example, the network device may transmit a synchronization signal through an antenna port in antenna port set 0 and / or antenna port set 1, as shown in FIG11.

[0189] It should be understood that the synchronization signal sent by the network device may refer to a synchronization signal block or other forms of synchronization signal. In some embodiments, the synchronization signal sent by the network device may be the same as the synchronization signal in the existing system or may be different from the synchronization signal in the existing system, and this application is not limited to this.

[0190] After the network device sends the synchronization signal, the terminal device can detect the synchronization signal sent by the network device. The synchronization signal sent by the network device can include a first synchronization signal, which can be, for example, any one or more synchronization signals among the synchronization signals sent by the network device.

[0191] In some embodiments, the first synchronization signal may be, for example, a synchronization signal with the strongest received signal strength detected by the terminal device.

[0192] In some embodiments, the first synchronization signal may be, for example, a synchronization signal whose received signal strength detected by the terminal device exceeds a first threshold. It should be noted that the embodiment of the present application does not specifically limit the value of the first threshold. The first threshold may be a value set according to actual conditions. For example, the first threshold is -50dBm. It should also be noted that the embodiment of the present application does not limit the configuration method of the first threshold. For example, the first threshold may be predefined or preconfigured, or may be configured by the network device through high-layer signaling (such as RRC signaling), or may be determined based on the implementation of the terminal device.

[0193] In some embodiments, after the terminal device detects the first synchronization signal, at least one antenna port associated with the first synchronization signal can be determined based on the first synchronization signal.

[0194] In some embodiments, at least one antenna port associated with the first synchronization signal is an antenna port in a first antenna port set, wherein the first synchronization signal is associated with the first antenna port set.

[0195] The first antenna port set can be any antenna port set in the wireless communication network system. Taking the network system shown in Figure 9 as an example, the first antenna port set can be antenna port set 0 in Figure 9 or antenna port set 1 in Figure 9.

[0196] The first antenna port set may include one or more antenna ports. In some embodiments, when the first antenna port set includes multiple (two or more) antenna ports, at least two of the multiple antenna ports included in the first antenna port set may be distributed antenna ports, or in other words, at least two of the multiple antenna ports included in the first antenna port set are geographically separated or do not have a first QCL relationship. In some embodiments, any two of the multiple antenna ports included in the first antenna port set are distributed antenna ports, or in other words, any two of the multiple antenna ports included in the first antenna port set are geographically separated or do not have a first QCL relationship.

[0197] In some embodiments, the association of the first synchronization signal with the first antenna port set may mean that there is an association relationship or mapping relationship between the first synchronization signal and the first antenna port set, and the first antenna port set can be determined based on the first synchronization signal, or the first synchronization signal can be determined based on the first antenna port set.

[0198] In some embodiments, the association relationship between the first synchronization signal and the first antenna port set is indicated by a first association relationship. In other words, the first association relationship can be used to indicate the association relationship between the synchronization signal and the antenna port set, such as indicating antenna port sets associated with different synchronization signals.

[0199] That is, in the embodiment of the present application, different antenna port sets can be associated with different synchronization signals. The association relationship between the different antenna port sets and the different synchronization signals can be indicated by a first association relationship. The first association relationship is introduced below.

[0200] In some embodiments, the first association relationship may indicate the association relationship between the synchronization signal and the antenna port set by indicating the index of the synchronization signal and the identifier of the antenna port set. For example, the first association relationship may include: SSB 0 is associated with antenna port set 0, SSB 1 is associated with antenna port set 1, etc.

[0201] In some embodiments, in the first association relationship, one synchronization signal may be associated with one antenna port set, that is, there may be a one-to-one correspondence between the synchronization signal and the antenna port set. For example, SSB 0 is associated with antenna port set 0, and SSB 1 is associated with antenna port set 1.

[0202] In some embodiments, in the first association relationship, a synchronization signal can be associated with multiple antenna port sets, that is, there can be a one-to-many correspondence between synchronization signals and antenna port sets. For example, SSB 0 is associated with both antenna port set 0 and antenna port set 1.

[0203] In some embodiments, in the first association relationship, multiple synchronization signals can be associated with one antenna port set, that is, there can be a many-to-one correspondence between synchronization signals and antenna port sets. For example, SSB 0 and SSB 1 are both associated with antenna port set 0.

[0204] In some embodiments, the first association relationship may include one or more of the following: a correspondence between a synchronization signal and an antenna port set; a correspondence between a synchronization signal and multiple antenna port sets; a correspondence between multiple synchronization signals and an antenna port set; a one-to-one correspondence between multiple synchronization signals and multiple antenna port sets; a correspondence between a synchronization signal index and an antenna port set identifier; a correspondence between a synchronization signal index and multiple antenna port set identifiers; a correspondence between multiple synchronization signal indices and an antenna port set identifier; and a one-to-one correspondence between multiple synchronization signal indices and multiple antenna port set identifiers.

[0205] In some embodiments, the first association relationship may be predefined or preconfigured. For example, the first association relationship may be predefined by a protocol. In some embodiments, the first association relationship may be configured by the network device through high-layer signaling.

[0206] In some embodiments, the terminal device determining, based on the first synchronization signal, at least one antenna port associated with the first synchronization signal may include the terminal device determining, based on the first synchronization signal, an identifier of a first antenna port set. For example, the terminal device determines, based on the first synchronization signal and the first association relationship, the identifier of the first antenna port set associated with the first synchronization signal.

[0207] In some embodiments, the terminal device determining, based on the first synchronization signal, at least one antenna port associated with the first synchronization signal may include the terminal device determining, based on the first synchronization signal, an identifier of at least one antenna port in the first antenna port set. For example, the terminal device determines, based on the first synchronization signal and the first association relationship, the first antenna port set associated with the first synchronization signal or the identifier of the first antenna port set, and further determines, from the first antenna port set, an identifier of at least one antenna port in the first antenna port set (such as an identifier of a primary antenna port or an identifier of a secondary antenna port in the first antenna port set).

[0208] That is, in some embodiments, the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined based on the first synchronization signal. The embodiments of the present application do not specifically limit the implementation method of determining the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set based on the first synchronization signal. For example, the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set can be explicitly or implicitly determined by the first synchronization signal.

[0209] As an implementation, the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set may be determined based on one or more of the following information: an index of the first synchronization signal, a synchronization signal sequence corresponding to the first synchronization signal, and information transmitted in a downlink channel associated with the first synchronization signal. For a detailed description of how to use the above information to determine the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set, please refer to the previous text and, for the sake of brevity, will not be repeated here.

[0210] As mentioned above, the first synchronization signal is sent by the network device to the terminal device. The sending of the first synchronization signal is introduced below.

[0211] In some embodiments, the first synchronization signal may be sent based on a first association relationship. In this case, the terminal device determining at least one antenna port associated with the first synchronization signal based on the first synchronization signal may include: the terminal device determining a first antenna port set based on the first synchronization signal and the first association relationship.

[0212] In some embodiments, the first synchronization signal is sent through some antennas in the first antenna port set. For example, the first antenna port set includes antenna port 0, antenna port 1, and antenna port 2. The first synchronization signal may be sent through antenna port 0, antenna port 1, or both antenna port 0 and antenna port 2.

[0213] In some embodiments, the first synchronization signal is transmitted via all antenna ports (all antenna ports) in the first antenna port set. That is, all antenna ports in the first antenna port set are used to transmit the first synchronization signal. For example, the first antenna port set includes antenna port 0, antenna port 1, and antenna port 2, where antenna port 0, antenna port 1, and antenna port 2 all transmit the first synchronization signal.

[0214] In some embodiments, the first antenna port set may include a primary antenna port. In this case, the first synchronization signal may be sent via the primary antenna port. For example, the first antenna port set may include one or more primary antenna ports, each of which may be used to send the first synchronization signal.

[0215] In some embodiments, the first antenna port set may include a secondary antenna port, for example, one or more secondary antenna ports. In some embodiments, the secondary antenna ports in the first antenna port set do not transmit synchronization signals, for example, the secondary antenna ports do not transmit the first synchronization signal or other synchronization signals.

[0216] In some embodiments, a primary antenna port in the first antenna port set may transmit a synchronization signal, while a secondary antenna port in the first antenna port set may not transmit a synchronization signal. For example, the primary antenna port may transmit a first synchronization signal, while the secondary antenna port may not transmit a first synchronization signal.

[0217] In some embodiments, some antenna ports in the first antenna port set do not transmit synchronization signals that are not associated with the first antenna port set. For example, if the first synchronization signal has a one-to-one correspondence with the first antenna port set, some antenna ports in the first antenna port set do not transmit synchronization signals other than the first synchronization signal. As an example, the first antenna port set includes antenna port 0, antenna port 1, and antenna port 2, and antenna port 0 does not transmit synchronization signals other than the first synchronization signal, or antenna port 0 and antenna port 1 do not transmit synchronization signals other than the first synchronization signal.

[0218] In some embodiments, all antenna ports in the first antenna port set do not transmit synchronization signals that are not associated with the first antenna port set. For example, if the first synchronization signal has a one-to-one correspondence with the first antenna port set, then all antenna ports in the first antenna port set do not transmit synchronization signals other than the first synchronization signal. As an example, the first antenna port set includes antenna port 0, antenna port 1, and antenna port 2, and antenna port 0, antenna port 1, and antenna port 2 do not transmit synchronization signals other than the first synchronization signal.

[0219] In some embodiments, the primary antenna port and / or the secondary antenna port in the first antenna port set do not transmit synchronization signals that are not associated with the first antenna port set. For example, the primary antenna port in the first antenna port set does not transmit synchronization signals that are not associated with the first antenna port set; or the secondary antenna port in the first antenna port set does not transmit synchronization signals that are not associated with the first antenna port set; or, both the primary antenna port and the secondary antenna port in the first antenna port set do not transmit synchronization signals that are not associated with the first antenna port set.

[0220] In some embodiments, a second association relationship is established between the first antenna port set and the first random access transmission opportunity set, and / or a second association relationship is established between the first synchronization signal and the first random access transmission opportunity set, wherein at least one random access transmission opportunity in the first random access transmission opportunity set is used to transmit a random access signal (e.g., a preamble).

[0221] That is, in this embodiment of the present application, different antenna port sets can be associated with different random access transmission opportunity sets. The association between these different antenna port sets and different random access transmission opportunity sets can be indicated by a second association relationship. Alternatively, in this embodiment of the present application, different synchronization signals can be associated with different random access transmission opportunity sets. The association between these different synchronization signals and different random access transmission opportunity sets can be indicated by a second association relationship. The second association relationship is described below.

[0222] In some embodiments, the association between the antenna port set and the random access transmission opportunity set is directly indicated, for example, the second association is directly used to indicate the association between the antenna port set and the random access transmission opportunity set. In some embodiments, the association between the antenna port set and the random access transmission opportunity set is indirectly indicated, for example, the second association indirectly indicates the association between the antenna port set and the random access transmission opportunity set by indicating the association between the antenna port set and the synchronization signal, and the association between the synchronization signal and the random access transmission opportunity set. As an example, antenna port set 0 is associated with SSB 0, which is associated with random access transmission opportunity set 0. Therefore, antenna port set 0 is associated with random access transmission opportunity set 0. As another example, antenna port set 1 is associated with SSB 1, which is associated with random access transmission opportunity set 1. Therefore, antenna port set 1 is associated with random access transmission opportunity set 1.

[0223] In some embodiments, the second association relationship may indicate the association relationship between the antenna port set and the random access transmission opportunity set by indicating the identifier of the antenna port set and the identifier of the random access transmission opportunity set. For example, the second association relationship may include: antenna port set 0 is associated with random access transmission opportunity set 0, antenna port set 1 is associated with random access transmission opportunity set 1, etc.

[0224] In some embodiments, in the second association relationship, one antenna port set may be associated with one random access transmission opportunity set. That is, there may be a one-to-one correspondence between antenna port sets and random access transmission opportunity sets. For example, antenna port set 0 is associated with random access transmission opportunity set 0, and antenna port set 1 is associated with random access transmission opportunity set 1.

[0225] In some embodiments, in the second association relationship, one antenna port set can be associated with multiple random access transmission opportunity sets. That is, there can be a one-to-many correspondence between antenna port sets and random access transmission opportunity sets. For example, antenna port set 0 is associated with both random access transmission opportunity set 0 and random access transmission opportunity set 1.

[0226] In some embodiments, in the second association relationship, multiple antenna port sets can be associated with one random access transmission opportunity set. That is, there can be a many-to-one correspondence between antenna port sets and random access transmission opportunity sets. For example, antenna port set 0 and antenna port set 1 are both associated with random access transmission opportunity set 0.

[0227] In some embodiments, the second association relationship may indicate the association relationship between the synchronization signal and the random access transmission opportunity set by indicating the index of the synchronization signal and the identifier of the random access transmission opportunity set. For example, the second association relationship may include: SSB 0 is associated with random access transmission opportunity set 0, SSB 1 is associated with random access transmission opportunity set 1, etc.

[0228] In some embodiments, in the second association relationship, one synchronization signal may be associated with one random access transmission opportunity set, that is, there may be a one-to-one correspondence between synchronization signals and random access transmission opportunity sets. For example, SSB 0 is associated with random access transmission opportunity set 0, and SSB 1 is associated with random access transmission opportunity set 1.

[0229] In some embodiments, in the second association relationship, a synchronization signal can be associated with multiple random access transmission opportunity sets. That is, there can be a one-to-many correspondence between synchronization signals and random access transmission opportunity sets. For example, SSB 0 is associated with both random access transmission opportunity set 0 and random access transmission opportunity set 1.

[0230] In some embodiments, in the second association relationship, multiple synchronization signals may be associated with one random access transmission opportunity set, that is, there may be a many-to-one correspondence between synchronization signals and random access transmission opportunity sets. For example, both SSB 0 and SSB 1 are associated with random access transmission opportunity set 0.

[0231] In some embodiments, the second association relationship may include one or more of the following: a correspondence between an antenna port set and a random access transmission opportunity set; a correspondence between an antenna port set and multiple random access transmission opportunity sets; a correspondence between multiple antenna port sets and a random access transmission opportunity set; a one-to-one correspondence between multiple antenna port sets and multiple random access transmission opportunity sets; a correspondence between an antenna port set identifier and a random access transmission opportunity set identifier; a correspondence between an antenna port set identifier and multiple random access transmission opportunity set identifiers; a correspondence between multiple antenna port set identifiers and a random access transmission opportunity set identifier; a correspondence between multiple antenna port set identifiers and multiple a one-to-one correspondence between a random access transmission opportunity set identifier; a correspondence between a synchronization signal and a random access transmission opportunity set; a correspondence between a synchronization signal and multiple random access transmission opportunity sets; a correspondence between multiple synchronization signals and a random access transmission opportunity set; a one-to-one correspondence between multiple synchronization signals and multiple random access transmission opportunity sets; a correspondence between a synchronization signal index and a random access transmission opportunity set identifier; a correspondence between a synchronization signal index and multiple random access transmission opportunity set identifiers; a correspondence between multiple synchronization signal indices and a random access transmission opportunity set identifier; and a one-to-one correspondence between multiple synchronization signal indices and multiple random access transmission opportunity set identifiers.

[0232] In some embodiments, the second association relationship may be predefined or preconfigured. For example, the second association relationship may be predefined by a protocol. In some embodiments, the second association relationship may be configured by the network device through high-layer signaling.

[0233] In some embodiments, the terminal device may transmit a random access signal through at least one random access transmission opportunity in the first random access transmission opportunity set, where the at least one random access transmission opportunity is determined based on the second association relationship. Alternatively, the terminal device may determine at least one random access transmission opportunity in the first random access transmission opportunity set based on the second association relationship, and transmit the random access signal through the at least one random access transmission opportunity.

[0234] In some embodiments, a terminal device may transmit a random access signal to at least one antenna port in a first antenna port set. Alternatively, at least one antenna port in the first antenna port set may be used to detect a first random access transmission opportunity set associated with the first antenna port set. For example, at least one antenna port in the first antenna port set may be used to monitor whether a random access signal is transmitted on resources in the first random access transmission opportunity set associated with the first antenna port set; and / or at least one antenna port in the first antenna port set may be used to receive a random access signal transmitted on resources in the first random access transmission opportunity set associated with the first antenna port set.

[0235] In some embodiments, the terminal device may send a random access signal to at least one antenna port in the first antenna port set, which may include one or more of the following: the terminal device sends a random access signal to the antenna port that sends the first synchronization signal in the first antenna port set; the terminal device sends a random access signal to some antenna ports in the first antenna port set; the terminal device sends a random access signal to all antenna ports in the first antenna port set; the terminal device sends a random access signal to the main antenna port in the first antenna port set; the terminal device sends a random access signal to the auxiliary antenna port in the first antenna port set.

[0236] In some embodiments, when a terminal device transmits a random access signal to an antenna port in the first antenna port set that transmits a first synchronization signal, it can be understood that the antenna port that transmits the first synchronization signal and the antenna port that detects the random access signal are the same antenna port. For example, if the first synchronization signal is transmitted on antenna port 0 in the first antenna port set, then subsequent random access signal detection will also be performed on antenna port 0 in the first antenna port set.

[0237] In some embodiments, when a terminal device transmits a random access signal to all antenna ports in a first antenna port set, all antenna ports in the first antenna port set may be used to detect the random access signal. As an implementation, a secondary antenna port in the first antenna port set may detect the random access signal and report the detection result to the primary antenna port; the primary antenna port in the first antenna port set may detect the random access signal and perform random access response scheduling based on the detected random access signal.

[0238] In some embodiments, when the terminal device sends a random access signal to a primary antenna port in the first antenna port set, one or more primary antenna ports in the first antenna port set may be used to detect the random access signal.

[0239] In some embodiments, when the terminal device sends a random access signal to a secondary antenna port in the first antenna port set, one or more secondary antenna ports in the first antenna port set may be used to detect the random access signal.

[0240] In some embodiments, the secondary antenna ports in the first antenna port set do not detect the random access transmission opportunity set associated with the first antenna port set. In other words, the secondary antenna ports in the first antenna port set do not detect random access signals.

[0241] In some embodiments, at least one antenna port in the first antenna port set can be used to detect a first random access transmission opportunity set associated with the first antenna port set, and the at least one antenna port does not detect a random access transmission opportunity set that is not associated with the first antenna port set.

[0242] In some embodiments, a terminal device sending a random access signal to at least one antenna port in the first antenna port set may mean that a transmit spatial filter used by the terminal device to send the random access signal partially overlaps or completely overlaps with a receive spatial filter of the at least one antenna port. For example, a terminal device sending a random access signal to a primary antenna port in the first antenna port set may mean that a transmit spatial filter used by the terminal device to send the random access signal partially overlaps or completely overlaps with a receive spatial filter of the primary antenna port in the first antenna port set.

[0243] In some embodiments, a terminal device sending a random access signal to at least one antenna port in the first antenna port set may mean that the resource from which the terminal device sends the random access signal is associated with the at least one antenna port. For example, a terminal device sending a random access signal to a primary antenna port in the first antenna port set may mean that the resource from which the terminal device sends the random access signal is associated with the primary antenna port in the first antenna port set.

[0244] In some embodiments, the terminal device sending a random access signal to at least one antenna port in the first antenna port set may mean that the transmit beam direction used by the terminal device to send the random access signal has an associated relationship with the receive beam direction of the at least one antenna port. For example, the terminal device sending a random access signal to a primary antenna port in the first antenna port set may mean that the transmit beam direction used by the terminal device to send the random access signal has an associated relationship with the receive beam direction of the primary antenna port in the first antenna port set.

[0245] In some embodiments, the terminal device may transmit a random access signal through at least one random access transmission opportunity in the first random access transmission opportunity set, which may include: the terminal device transmits the random access signal to at least one antenna port in the first antenna port set through at least one random access transmission opportunity in the first random access transmission opportunity set. The at least one antenna port in the first antenna port set may be one or more of the following: an antenna port in the first antenna port set that transmits a first synchronization signal, some antenna ports in the first antenna port set, all antenna ports in the first antenna port set, a primary antenna port in the first antenna port set, and a secondary antenna port in the first antenna port set.

[0246] In some embodiments, after sending the random access signal, the terminal device may further detect a random access response, where the random access response is a response to the random access signal sent by the terminal device.

[0247] This application does not specifically limit the antenna port for sending a random access response. For example, the random access response is sent via at least one antenna port in the first antenna port set. Exemplarily, the at least one antenna port in the first antenna port set can be one or more of the following: an antenna port in the first antenna port set that sends a first synchronization signal, some antenna ports in the first antenna port set, all antenna ports in the first antenna port set, a primary antenna port in the first antenna port set, and a secondary antenna port in the first antenna port set.

[0248] As a specific implementation, a primary antenna port in the first antenna port set may be used to send a random access response. As another specific implementation, the primary antenna port in the first antenna port set may schedule a secondary antenna port to send a random access response. For example, the primary antenna port may schedule a secondary antenna port that has detected a random access signal to send a random access response.

[0249] In some embodiments, at least one antenna port in the first antenna port set may be used to transmit first indication information, which may be used to determine the first antenna port set and / or a transmitted synchronization signal. The first indication information is described in detail below.

[0250] In some embodiments, the first indication information can be used to determine at least one of the following information: an identifier of the first antenna port set; an identifier of the antenna ports included in the first antenna port set; an identifier of the primary antenna port in the first antenna port set; an identifier of the secondary antenna port in the first antenna port set; an identifier of the antenna port that sends the first synchronization signal in the first antenna port set; an identifier of the antenna port that detects the random access signal in the first antenna port set; an identifier of the antenna port that sends the random access response in the first antenna port set; an index of the synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of the synchronization signal associated with the first antenna port set; an index of the synchronization signal for which the antenna ports in the first antenna port set need to perform rate matching when performing data transmission; the type of quasi-co-location relationship associated with the first antenna port set; and an association relationship between the first antenna port set and the first random access transmission opportunity set.

[0251] In some embodiments, the first indication information used to determine the transmitted synchronization signal may include the first indication information being used to indicate a synchronization signal associated with the first antenna port set, so as to determine the synchronization signal transmitted by the first antenna port set. For example, at least one antenna port in the first antenna port set may send the first indication information, where the first indication information indicates that the transmitted synchronization signal is SSB 0 by indicating that the synchronization signal associated with the first antenna port set is SSB 0.

[0252] In some embodiments, the first indication information used to determine the transmitted synchronization signal may include the first indication information being used to indicate the synchronization signal transmitted in the communication network in which the first antenna port set is located. For example, the communication network in which the first antenna port set is located includes a first antenna port set and a second antenna port set, the first antenna port set is associated with SSB 0, and the second antenna port set is associated with SSB 1. At least one antenna port in the first antenna port set may send the first indication information, where the first indication information indicates that the transmitted synchronization signals are SSB 0 and SSB 1.

[0253] The embodiments of the present application do not specifically limit the at least one antenna port that transmits the first indication information. For example, the at least one antenna port that transmits the first indication information may be one or more of the following: an antenna port in the first antenna port set that transmits the first synchronization signal, an antenna port in the first antenna port set that detects the random access signal, and all antenna ports in the first antenna port set.

[0254] In some embodiments, the antenna ports in the first antenna port set may perform rate matching on resources used for synchronization signal transmission when scheduling data transmission.

[0255] As an implementation method, when scheduling data transmission, the antenna ports in the first antenna port set may perform rate matching on the resources for synchronization signal transmission associated with the first antenna port set. For example, the first antenna port set is associated with SSB 0, and the antenna ports in the first antenna port set schedule a first time-frequency resource for data transmission. The SSB 0 transmission occupies a second time-frequency resource. If the first time-frequency resource and the second time-frequency resource at least partially overlap in the time domain and / or frequency domain, the overlapping portion is not used for data transmission.

[0256] As another implementation, when scheduling data transmission, the antenna ports in the first antenna port set may perform rate matching on the resources of the synchronization signal transmitted in the communication network in which the first antenna port set is located. For example, the SSBs transmitted in the communication network in which the first antenna port set is located include SSB 0 and SSB 1, and the antenna ports in the first antenna port set schedule a first time-frequency resource for data transmission. The transmission of SSB 0 and SSB 1 occupies a third time-frequency resource. If the first time-frequency resource and the third time-frequency resource at least partially overlap in the time domain and / or frequency domain, the overlapping portion is not used for data transmission.

[0257] For ease of understanding, the following takes the synchronization signal as the SSB in the NR system and the random access transmission opportunity set as the RO set in the NR system as an example, and describes the initial access process in Example 1 in combination with the network architecture shown in Figure 9.

[0258] The communication network includes a first AP set (such as AP set 0 in Figure 9) and a second AP set (such as AP set 1 in Figure 9). The APs in the first AP set transmit SSB 0, and the APs in the first AP set do not transmit SSB 1; the APs in the second AP set transmit SSB 1, and the APs in the second AP set do not transmit SSB 0. Optionally, the positions of SSB 0 and SSB 1 in the radio frame are the same as the positions of SSB 0 and SSB 1 in the radio frame in the NR system. Optionally, the identifier of the AP set is determined according to the SSB index, that is, the identifier of the first AP set associated with SSB 0 is 0, and the identifier of the second AP set associated with SSB 1 is 1.

[0259] The first AP set is associated with the first RO set, and the second AP set is associated with the second RO set.

[0260] During initial access, the terminal device attempts to search for an SSB using the predefined possible time-frequency locations of the SSB. In the scenario shown in Figure 9, the terminal device may detect SSB 1 and, through the detected SSB 1, obtain time and frequency synchronization, radio frame timing, and determine the identity of the second AP set. Accordingly, the terminal device can initiate random access to the network device through an RO in the second RO set.

[0261] Alternatively, the terminal device may also detect SSB 0 and SSB 1, and obtain time and frequency synchronization, wireless frame timing, and determine the first AP set identifier and the second AP set identifier through the detected SSB 0 and SSB 1. Accordingly, the terminal device may initiate random access to the network device through an RO in the first RO set; or, the terminal device may initiate random access to the network device through an RO in the second RO set; or, the terminal device may select an AP set associated with an SSB with a stronger signal, such as the second AP set, based on the received signal strengths of SSB 0 and SSB 1, and initiate random access to the network device through an RO in the second RO set associated with the second AP set.

[0262] In some cases, the primary AP in the first AP set transmits SSB 0, while the secondary AP does not transmit SSB 0; the primary AP in the second AP set transmits SSB 1, while the secondary AP does not transmit SSB 1. Accordingly, the primary AP in the first AP set detects ROs in the first RO set, while the secondary AP does not detect ROs in the first RO set; the primary AP in the second AP set detects ROs in the second RO set, while the secondary AP does not detect ROs in the second RO set.

[0263] In other cases, all APs in the first AP set transmit SSB 0, and all APs in the second AP set transmit SSB 1. Accordingly, all APs in the first AP set detect ROs in the first RO set, and all APs in the second AP set detect ROs in the second RO set.

[0264] In the four-step random access process, the terminal device initiates random access including sending a random access preamble sequence.

[0265] When the master AP in the AP set detects the random access preamble sequence transmitted on the RO, the network device schedules the master AP to send the RAR corresponding to the random access preamble sequence to the terminal device; after receiving the RAR, the terminal device sends message 3 to the master AP; after receiving message 3, the network device schedules the master AP to send message 4 to the terminal device, thereby completing random access. Optionally, this embodiment is applicable to the case where the master AP in the AP set transmits an SSB associated with the AP set.

[0266] Alternatively, when a secondary AP in an AP set detects a random access preamble sequence transmitted on an RO, the secondary AP reports the detection result to a network device, which then schedules the primary AP in the AP set to send a RAR corresponding to the random access preamble sequence to a terminal device. After receiving the RAR, the terminal device sends message 3 to the primary AP. After receiving message 3, the network device schedules the primary AP to send message 4 to the terminal device, thereby completing random access. Optionally, this embodiment is applicable to a situation where the primary AP in an AP set transmits an SSB associated with the AP set, and the secondary AP does not transmit an SSB associated with the AP set.

[0267] Alternatively, when a secondary AP in an AP set detects a random access preamble sequence transmitted on an RO, the network device schedules the secondary AP to send a RAR corresponding to the random access preamble sequence to the terminal device; after receiving the RAR, the terminal device sends message 3 to the secondary AP; after receiving message 3, the network device schedules the secondary AP to send message 4 to the terminal device, thereby completing random access. Optionally, this embodiment is applicable to a case where a secondary AP in an AP set transmits an SSB associated with the AP set.

[0268] In the two-step random access process, the terminal device initiates random access including sending a random access preamble sequence and uplink information.

[0269] When the master AP in the AP set detects the random access preamble sequence and uplink information transmitted on the RO, the network device schedules the master AP to send the RAR corresponding to the successful random access to the terminal device, thereby completing the random access. When the master AP in the AP set detects the random access preamble sequence transmitted on the RO but does not detect the uplink information, the network device schedules the master AP to send the RAR corresponding to the random access preamble sequence to the terminal device, and falls back to the four-step random access process. Optionally, this embodiment is applicable to the case where the master AP in the AP set transmits an SSB associated with the AP set.

[0270] Alternatively, when the secondary AP in the AP set detects the random access preamble sequence and uplink information transmitted on the RO, the secondary AP reports the detection result to the network device, and the network device schedules the primary AP in the AP set to send the RAR corresponding to the successful random access to the terminal device, thereby completing the random access; when the secondary AP in the AP set detects the random access preamble sequence transmitted on the RO but does not detect the uplink information, the network device schedules the primary AP in the AP set to send the RAR corresponding to the random access preamble sequence to the terminal device, and falls back to the four-step random access process. Optionally, this embodiment is applicable to the case where the primary AP in the AP set transmits the SSB associated with the AP set, and the secondary AP does not transmit the SSB associated with the AP set.

[0271] Alternatively, when a secondary AP in the AP set detects the random access preamble sequence and uplink information transmitted on the RO, the network device schedules the secondary AP to send a RAR corresponding to a successful random access to the terminal device, thereby completing the random access. When a secondary AP in the AP set detects the random access preamble sequence transmitted on the RO but does not detect uplink information, the network device schedules the secondary AP to send a RAR corresponding to the random access preamble sequence to the terminal device, and falls back to the four-step random access process. Optionally, this embodiment is applicable to the case where a secondary AP in the AP set transmits an SSB associated with the AP set.

[0272] Example 2: Synchronization signal associated with antenna port

[0273] To enable terminal devices to access a wireless communication network based on a distributed antenna system, network devices can send synchronization signals through antenna ports in the communication network. Taking the communication network shown in Figure 10 as an example, network devices can send synchronization signals through one or more antenna ports from antenna port 0 to antenna port 13, as shown in Figure 12.

[0274] It should be understood that the synchronization signal sent by the network device may refer to a synchronization signal block or other forms of synchronization signal. In some embodiments, the synchronization signal sent by the network device may be the same as the synchronization signal in the existing system or may be different from the synchronization signal in the existing system, and this application is not limited to this.

[0275] After the network device sends the synchronization signal, the terminal device can detect the synchronization signal sent by the network device. The synchronization signal sent by the network device can include a first synchronization signal, which can be, for example, any one or more synchronization signals among the synchronization signals sent by the network device.

[0276] In some embodiments, the first synchronization signal may be, for example, a synchronization signal with the strongest received signal strength detected by the terminal device.

[0277] In some embodiments, the first synchronization signal may be, for example, a synchronization signal whose received signal strength detected by the terminal device exceeds a second threshold. It should be noted that the embodiment of the present application does not specifically limit the value of the second threshold. The second threshold may be a value set according to actual conditions. For example, the second threshold is -50dBm. It should also be noted that the embodiment of the present application does not limit the configuration method of the second threshold. For example, the second threshold may be predefined or preconfigured, or may be configured by the network device through high-layer signaling (such as RRC signaling), or may be determined based on the implementation of the terminal device.

[0278] In some embodiments, the second threshold and the first threshold mentioned above may be the same. For example, the second threshold and the first threshold may both be -50 dBm.

[0279] In some embodiments, the second threshold and the first threshold mentioned above may be different. For example, the second threshold is set to -50 dBm, and the first threshold is set to -55 dBm.

[0280] In some embodiments, after the terminal device detects the first synchronization signal, at least one antenna port associated with the first synchronization signal can be determined based on the first synchronization signal.

[0281] In some embodiments, at least one antenna port associated with the first synchronization signal is a second antenna port, wherein the first synchronization signal is associated with the second antenna port.

[0282] The second antenna port can be any antenna port in the wireless communication network system. Taking the network system shown in Figure 10 as an example, the second antenna port can be antenna port 0 in Figure 10, antenna port 2 in Figure 10, or antenna port 12 in Figure 10, etc.

[0283] In some embodiments, associating the first synchronization signal with the second antenna port may mean that there is an association relationship or mapping relationship between the first synchronization signal and the second antenna port, and the second antenna port can be determined according to the first synchronization signal, or the first synchronization signal can be determined according to the second antenna port.

[0284] In some embodiments, the association between the first synchronization signal and the second antenna port is indicated by a third association relationship. In other words, the third association relationship can be used to indicate the association between the synchronization signal and the antenna port, such as indicating the antenna ports associated with different synchronization signals.

[0285] That is, in the embodiment of the present application, different antenna ports can be associated with different synchronization signals. The association relationship between different antenna ports and different synchronization signals can be indicated by a third association relationship. The third association relationship is introduced below.

[0286] In some embodiments, the third association relationship may indicate the association relationship between the synchronization signal and the antenna port by indicating the index of the synchronization signal and the identifier of the antenna port. For example, the third association relationship may include: SSB 0 is associated with antenna port 0, SSB 1 is associated with antenna port 1, etc.

[0287] In some embodiments, in the third association relationship, one synchronization signal can be associated with one antenna port, that is, there can be a one-to-one correspondence between the synchronization signal and the antenna port. For example, SSB 0 is associated with antenna port 0, and SSB 1 is associated with antenna port 1.

[0288] In some embodiments, in the third association relationship, a synchronization signal can be associated with multiple antenna ports, that is, there can be a one-to-many correspondence between synchronization signals and antenna ports. For example, SSB 0 is associated with both antenna port 0 and antenna port 1.

[0289] In some embodiments, in the third association relationship, multiple synchronization signals can be associated with one antenna port, that is, there can be a many-to-one correspondence between synchronization signals and antenna ports. For example, SSB 0 and SSB 1 are both associated with antenna port 0.

[0290] In some embodiments, the third association relationship may include one or more of the following: a correspondence between a synchronization signal and an antenna port; a correspondence between a synchronization signal and multiple antenna ports; a correspondence between multiple synchronization signals and one antenna port; a one-to-one correspondence between multiple synchronization signals and multiple antenna ports; a correspondence between a synchronization signal index and an antenna port identifier; a correspondence between a synchronization signal index and multiple antenna port identifiers; a correspondence between multiple synchronization signal indexes and one antenna port identifier; and a one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

[0291] In some embodiments, the third association relationship may be predefined or preconfigured. For example, the third association relationship may be predefined by a protocol. In some embodiments, the third association relationship may be configured by the network device through high-layer signaling.

[0292] In some embodiments, the terminal device determining, based on the first synchronization signal, at least one antenna port associated with the first synchronization signal may include the terminal device determining an identifier of the second antenna port based on the first synchronization signal. For example, the terminal device determines the identifier of the second antenna port associated with the first synchronization signal based on the first synchronization signal and the third association relationship.

[0293] That is, in some embodiments, the identifier of the second antenna port is determined based on the first synchronization signal. The embodiments of the present application do not specifically limit the implementation of determining the identifier of the second antenna port based on the first synchronization signal. For example, the identifier of the second antenna port can be determined explicitly or implicitly through the first synchronization signal.

[0294] As an implementation, the identifier of the second antenna port can be determined based on one or more of the following information: an index of the first synchronization signal, a synchronization signal sequence corresponding to the first synchronization signal, and information transmitted in a downlink channel associated with the first synchronization signal. For a detailed description of how to use this information to determine the identifier of the second antenna port, please refer to the previous article and, for the sake of brevity, will not be repeated here.

[0295] As mentioned above, the first synchronization signal is sent by the network device to the terminal device. The sending of the first synchronization signal is introduced below.

[0296] In some embodiments, the first synchronization signal may be sent based on a third association relationship. In this case, the terminal device determining at least one antenna port associated with the first synchronization signal based on the first synchronization signal may include: the terminal device determining a second antenna port based on the first synchronization signal and the third association relationship.

[0297] In some embodiments, the second antenna port does not send synchronization signals that are not associated with the second antenna port. For example, if the first synchronization signal has a one-to-one correspondence with the second antenna port, the second antenna port does not send synchronization signals other than the first synchronization signal.

[0298] In some embodiments, a fourth association relationship is established between the second antenna port and the second random access transmission opportunity set, and / or a fourth association relationship is established between the first synchronization signal and the second random access transmission opportunity set, wherein at least one random access transmission opportunity in the second random access transmission opportunity set is used to transmit a random access signal (e.g., a preamble).

[0299] That is, in this embodiment of the present application, different antenna ports can be associated with different random access transmission opportunity sets. The association between these different antenna ports and different random access transmission opportunity sets can be indicated by a fourth association relationship. Alternatively, in this embodiment of the present application, different synchronization signals can be associated with different random access transmission opportunity sets. The association between these different synchronization signals and different random access transmission opportunity sets can be indicated by a fourth association relationship. The fourth association relationship is described below.

[0300] In some embodiments, the association relationship between the antenna port and the random access transmission opportunity set is directly indicated. For example, the fourth association relationship is directly used to indicate the association relationship between the antenna port and the random access transmission opportunity set. In some embodiments, the association relationship between the antenna port and the random access transmission opportunity set is indirectly indicated. For example, the fourth association relationship indirectly indicates the association relationship between the antenna port and the random access transmission opportunity set by indicating the association relationship between the antenna port and the synchronization signal, and the association relationship between the synchronization signal and the random access transmission opportunity set. As an example, antenna port 0 is associated with SSB 0, and SSB 0 is associated with random access transmission opportunity set 0. Therefore, antenna port 0 is associated with random access transmission opportunity set 0. As another example, antenna port 1 is associated with SSB 1, and SSB 1 is associated with random access transmission opportunity set 1. Therefore, antenna port 1 is associated with random access transmission opportunity set 1.

[0301] In some embodiments, the fourth association relationship may indicate the association relationship between the antenna port and the random access transmission opportunity set by indicating the identifier of the antenna port and the identifier of the random access transmission opportunity set. For example, the fourth association relationship may include: antenna port 0 is associated with random access transmission opportunity set 0, antenna port 1 is associated with random access transmission opportunity set 1, etc.

[0302] In some embodiments, in the fourth association, one antenna port may be associated with one random access transmission opportunity set. That is, there may be a one-to-one correspondence between antenna ports and random access transmission opportunity sets. For example, antenna port 0 may be associated with random access transmission opportunity set 0, and antenna port 1 may be associated with random access transmission opportunity set 1.

[0303] In some embodiments, in the fourth association relationship, one antenna port can be associated with multiple random access transmission opportunity sets. That is, there can be a one-to-many correspondence between antenna ports and random access transmission opportunity sets. For example, antenna port 0 is associated with both random access transmission opportunity set 0 and random access transmission opportunity set 1.

[0304] In some embodiments, in the fourth association relationship, multiple antenna ports can be associated with one random access transmission opportunity set, that is, there can be a many-to-one correspondence between antenna ports and random access transmission opportunity sets. For example, antenna port 0 and antenna port 1 are both associated with random access transmission opportunity set 0.

[0305] In some embodiments, the fourth association relationship may indicate the association relationship between the synchronization signal and the random access transmission opportunity set by indicating the index of the synchronization signal and the identifier of the random access transmission opportunity set. For example, the fourth association relationship may include: SSB 0 is associated with random access transmission opportunity set 0, SSB 1 is associated with random access transmission opportunity set 1, etc.

[0306] In some embodiments, in the fourth association, one synchronization signal may be associated with one random access transmission opportunity set. That is, there may be a one-to-one correspondence between synchronization signals and random access transmission opportunity sets. For example, SSB 0 is associated with random access transmission opportunity set 0, and SSB 1 is associated with random access transmission opportunity set 1.

[0307] In some embodiments, in the fourth association relationship, a synchronization signal can be associated with multiple random access transmission opportunity sets. That is, there can be a one-to-many correspondence between synchronization signals and random access transmission opportunity sets. For example, SSB 0 is associated with both random access transmission opportunity set 0 and random access transmission opportunity set 1.

[0308] In some embodiments, in the fourth association relationship, multiple synchronization signals can be associated with one random access transmission opportunity set, that is, there can be a many-to-one correspondence between synchronization signals and random access transmission opportunity sets. For example, SSB 0 and SSB 1 are both associated with random access transmission opportunity set 0.

[0309] In some embodiments, the fourth association relationship may include one or more of the following: a correspondence between an antenna port and a random access transmission opportunity set; a correspondence between an antenna port and multiple random access transmission opportunity sets; a correspondence between multiple antenna ports and a random access transmission opportunity set; a one-to-one correspondence between multiple antenna ports and multiple random access transmission opportunity sets; a correspondence between an antenna port identifier and a random access transmission opportunity set identifier; a correspondence between an antenna port identifier and multiple random access transmission opportunity set identifiers; a correspondence between multiple antenna port identifiers and a random access transmission opportunity set identifier; a correspondence between multiple antenna port identifiers and multiple random access transmission opportunity sets; a correspondence between multiple antenna port identifiers and multiple random access transmission opportunity sets. One-to-one correspondence between set identifiers; correspondence between a synchronization signal and a random access transmission opportunity set; correspondence between a synchronization signal and multiple random access transmission opportunity sets; correspondence between multiple synchronization signals and a random access transmission opportunity set; one-to-one correspondence between multiple synchronization signals and multiple random access transmission opportunity sets; correspondence between a synchronization signal index and a random access transmission opportunity set identifier; correspondence between a synchronization signal index and multiple random access transmission opportunity set identifiers; correspondence between multiple synchronization signal indices and a random access transmission opportunity set identifier; and one-to-one correspondence between multiple synchronization signal indices and multiple random access transmission opportunity set identifiers.

[0310] In some embodiments, the fourth association relationship may be predefined or preconfigured. For example, the fourth association relationship may be predefined by a protocol. In some embodiments, the fourth association relationship may be configured by the network device through high-layer signaling.

[0311] In some embodiments, the terminal device may transmit a random access signal through at least one random access transmission opportunity in the second random access transmission opportunity set, where the at least one random access transmission opportunity is determined based on the fourth association relationship. In other words, the terminal device may determine at least one random access transmission opportunity in the second random access transmission opportunity set based on the fourth association relationship, and transmit the random access signal through the at least one random access transmission opportunity.

[0312] In some embodiments, the terminal device may send a random access signal to the second antenna port. Alternatively, the second antenna port may be used to detect a second random access transmission opportunity set associated with the second antenna port. For example, the second antenna port may be used to monitor whether a random access signal is transmitted on resources in the second random access transmission opportunity set associated with the second antenna port; and / or the second antenna port may be used to receive a random access signal transmitted on resources in the second random access transmission opportunity set associated with the second antenna port.

[0313] In some embodiments, the second antenna port may be used to detect a second random access transmission opportunity set associated with the second antenna port, and the second antenna port does not detect a random access transmission opportunity set not associated with the second antenna port.

[0314] In some embodiments, the terminal device sending the random access signal to the second antenna port may mean that a transmitting spatial filter of the terminal device sending the random access signal partially or completely overlaps with a receiving spatial filter of the second antenna port.

[0315] In some embodiments, the terminal device sending the random access signal to the second antenna port may mean that a resource over which the terminal device sends the random access signal is associated with the second antenna port.

[0316] In some embodiments, the terminal device sending the random access signal to the second antenna port may mean that a transmission beam direction used by the terminal device to send the random access signal is associated with a reception beam direction of the second antenna port.

[0317] In some embodiments, the terminal device may send a random access signal through at least one random access transmission opportunity in the second random access transmission opportunity set, which may include the terminal device sending a random access signal to the second antenna port through at least one random access transmission opportunity in the second random access transmission opportunity set.

[0318] In some embodiments, after sending the random access signal, the terminal device may further detect a random access response, where the random access response is a response to the random access signal sent by the terminal device.

[0319] This application does not specifically limit the antenna port for sending the random access response. For example, the random access response is sent via the second antenna port.

[0320] In some embodiments, the second antenna port can be used to transmit second indication information, and the second indication information can be used to determine the second antenna port and / or the transmitted synchronization signal. The second indication information is described in detail below.

[0321] In some embodiments, the second indication information can be used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network in which the second antenna port is located; an index of a synchronization signal associated with the second antenna port; an index of a synchronization signal for which the second antenna port needs to perform rate matching when performing data transmission; a type of quasi-co-location relationship associated with the second antenna port; and an association relationship between the second antenna port and a second random access transmission opportunity set.

[0322] In some embodiments, the second indication information used to determine the transmitted synchronization signal may include the second indication information being used to indicate a synchronization signal associated with the second antenna port to determine the synchronization signal transmitted by the second antenna port. For example, the second antenna port may send the second indication information, and the second indication information indicates that the transmitted synchronization signal is SSB 0 by indicating that the synchronization signal associated with the second antenna port is SSB 0.

[0323] In some embodiments, the second indication information used to determine the transmitted synchronization signal may include the second indication information being used to indicate the synchronization signal transmitted in the communication network in which the second antenna port is located. For example, the communication network in which the second antenna port is located includes a first antenna port and a second antenna port, the first antenna port is associated with SSB 0, and the second antenna port is associated with SSB 1. The second antenna port may send the second indication information, where the second indication information indicates that the transmitted synchronization signals are SSB 0 and SSB 1.

[0324] In some embodiments, the second antenna port may perform rate matching on resources used for synchronization signal transmission when scheduling data transmission.

[0325] As an implementation, when scheduling data transmission, the second antenna port may perform rate matching on the resources for synchronization signal transmission associated with the second antenna port. For example, the second antenna port is associated with SSB 0, and the second antenna port schedules a first time-frequency resource for data transmission. The SSB 0 transmission occupies a second time-frequency resource. If the first time-frequency resource and the second time-frequency resource at least partially overlap in the time domain and / or frequency domain, the overlapping portion is not used for data transmission.

[0326] As another implementation, when scheduling data transmission, the second antenna port may perform rate matching on resources of synchronization signals transmitted in the communication network in which the second antenna port is located. For example, the SSBs transmitted in the communication network in which the second antenna port is located include SSB 0 and SSB 1. The second antenna port schedules a first time-frequency resource for data transmission, and the transmission of SSB 0 and SSB 1 occupies a third time-frequency resource. If the first time-frequency resource and the third time-frequency resource at least partially overlap in the time domain and / or frequency domain, the overlapping portion is not used for data transmission.

[0327] In some embodiments, the terminal device may send (report) the selected synchronization signal and / or antenna port to the network device. In other words, the terminal device may send (report) the detected synchronization signal and / or antenna port to the network device.

[0328] As an implementation method, the terminal device can send third indication information to the network device, where the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, where N and M are positive integers.

[0329] In some embodiments, the third indication information is used to determine the M antenna ports selected by the terminal device, including: the third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; wherein the M value is predefined or preconfigured, or the M value is determined based on a third threshold value, which is predefined or preconfigured.

[0330] In some embodiments, the M antenna ports selected by the terminal device can be M antenna ports with signal strengths ranging from strong to weak, that is, the M antenna ports selected by the terminal device can be the M antenna ports with the strongest signal strengths among the multiple antenna ports associated with the terminal device.

[0331] In some embodiments, the M antenna ports selected by the terminal device may be M antenna ports that are greater than or equal to a third threshold value. In other words, the number M is determined according to the third threshold value.

[0332] In some embodiments, the third threshold value may be a value indicating signal strength. For example, the threshold value may be a signal strength greater than -50 dBm.

[0333] In some embodiments, if the number of antenna ports determined by the terminal device is less than M, the indication bit may be a preset value or a filler value.

[0334] In some embodiments, the third indication information is used to determine the N synchronization signals selected by the terminal device, including: the third indication information is used to indicate the index of the N synchronization signals selected by the terminal device; wherein the N value is predefined or preconfigured, or the N value is determined based on a fourth threshold value, which is predefined or preconfigured.

[0335] In some embodiments, the N synchronization signals selected by the terminal device may be N synchronization signals with received signal strengths ranging from strong to weak, that is, the N synchronization signals selected by the terminal device may be the N synchronization signals with the strongest signal strengths detected by the terminal device.

[0336] In some embodiments, the N synchronization signals selected by the terminal device may be N synchronization signals that are greater than or equal to a fourth threshold value. In other words, the number N is determined according to the fourth threshold value.

[0337] In some embodiments, the fourth threshold value may be a value indicating the received signal strength. For example, the threshold value may be a received signal strength greater than -50 dBm.

[0338] In some embodiments, if the number of synchronization signals determined by the terminal device is less than N, the indication bit may be a preset value or a filler value.

[0339] The embodiment of the present application does not specifically limit the carrying method of the third indication information. Exemplarily, the third indication information can be carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

[0340] As an example, the third indication information may be carried in a preamble. As another example, the third indication information may be carried in Msg 3. As yet another example, the third indication information may be carried in Msg 5 after the random access procedure is completed. As yet another example, the third indication information may be carried in uplink scheduling after the random access procedure is completed. As yet another example, the third indication information may be carried in uplink information in a two-step random access procedure, etc.

[0341] For ease of understanding, the following takes the synchronization signal as the SSB in the NR system and the random access transmission opportunity set as the RO set in the NR system as an example, and describes the initial access process in Example 2 in combination with the network system architecture shown in Figure 10.

[0342] As shown in Figure 10, the communication network includes 14 APs, which transmit SSB 0 to SSB 13 respectively. Each AP only transmits the SSB associated with the AP, for example, the first AP only transmits SSB 0, the second AP only transmits SSB 1, and so on. Optionally, the positions of SSB 0 to SSB 13 in the radio frame are the same as the positions of SSB 0 to SSB 13 in the radio frame in the NR system. Optionally, the AP identifier is determined according to the SSB index, for example, the first AP associated with SSB 0 has an identifier of 0, and the second AP associated with SSB 1 has an identifier of 1.

[0343] The first AP is associated with a first RO set, the second AP is associated with a second RO set, and so on.

[0344] During the initial access process, the terminal device attempts to search for SSBs through predefined possible time-frequency positions of SSBs. In the scenario shown in Figure 10, the terminal device may detect SSBs 6, SSB 7, SSB 11, and SSB 12, and obtain time and frequency synchronization, radio frame timing, and determine the identifier of the corresponding AP (i.e., AP 6, AP 7, AP 11, and AP 12) through at least one of the detected SSBs. Accordingly, the terminal device may initiate random access to the network device through an RO in at least one RO set associated with these APs. For example, the terminal device may select the twelfth RO set associated with AP 12 based on signal strength to initiate random access to the network device; or, the terminal device may select multiple RO sets associated with multiple APs based on a signal strength threshold to initiate random access to the network device respectively. For example, the terminal device may select the twelfth RO set and the seventh RO set associated with AP 12 and AP 7 based on a signal strength threshold to initiate random access to the network device respectively.

[0345] The following description will be made by taking an example in which the terminal device selects the twelfth RO set associated with AP 12 to initiate random access to the network device.

[0346] In the four-step random access process, the terminal device initiates random access including sending a random access preamble sequence.

[0347] When AP 12 detects the random access preamble sequence transmitted on the RO, the network device schedules AP 12 to send the RAR corresponding to the random access preamble sequence to the terminal device. After receiving the RAR, the terminal device sends message 3 to the master AP. After receiving message 3, the network device schedules AP 12 to send message 4 to the terminal device, thereby completing random access. Optionally, the terminal device reports the identifier of the AP that can be used for communication with the terminal device to the network device using at least one of the following information: the random access preamble sequence, message 3, message 5 after the random access process is completed, and uplink scheduling after the random access process is completed.

[0348] In the two-step random access process, the terminal device initiates random access including sending a random access preamble sequence and uplink information.

[0349] When AP 12 detects the random access preamble and uplink information transmitted on the RO, the network device schedules AP 12 to send a RAR corresponding to a successful random access to the terminal device, thereby completing the random access. When AP 12 detects the random access preamble transmitted on the RO but does not detect uplink information, the network device schedules AP 12 to send the RAR corresponding to the random access preamble to the terminal device, falling back to the four-step random access process. Optionally, the terminal device reports the identifier of an AP that can be used for communication with the terminal device to the network device using at least one of the following information: random access preamble, uplink information, message 3, message 5 after the random access process is completed, and uplink scheduling after the random access process is completed.

[0350] Optionally, the terminal device may report AP 6, AP 7, AP 11 and AP 12; or, the terminal device may report the optimal M APs according to signal strength, where M is a positive integer and is predefined or configured by the network device.

[0351] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 12. The device embodiment of the present application is described in detail below in conjunction with Figures 13 to 15. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0352] FIG13 is a schematic diagram of the structure of a terminal device according to an embodiment of the present application. The terminal device 1300 shown in FIG13 may include a first detection module 1310 and a first determination module 1320.

[0353] The first detection module 1310 may be configured to detect a synchronization signal sent by a network device.

[0354] The first determination module 1320 can be used to determine at least one antenna port associated with the first synchronization signal according to the first synchronization signal after the terminal device detects the first synchronization signal.

[0355] Optionally, the at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

[0356] Optionally, the first synchronization signal is sent according to a first association relationship, and the first determination module is further used to: determine the first antenna port set according to the first synchronization signal and the first association relationship.

[0357] Optionally, the first association relationship includes at least one of the following: a correspondence between a synchronization signal and an antenna port set; a correspondence between a synchronization signal and multiple antenna port sets; a correspondence between multiple synchronization signals and an antenna port set; a one-to-one correspondence between multiple synchronization signals and multiple antenna port sets; a correspondence between a synchronization signal index and an antenna port set identifier; a correspondence between a synchronization signal index and multiple antenna port set identifiers; a correspondence between multiple synchronization signal indexes and an antenna port set identifier; a one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

[0358] Optionally, the first determination module is further used to: determine the identifier of the first antenna port set based on the first synchronization signal; or determine the identifier of at least one antenna port in the first antenna port set based on the first synchronization signal.

[0359] Optionally, the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined based on one or more of the following information: the index of the first synchronization signal; the synchronization signal sequence corresponding to the first synchronization signal; and the information transmitted in the downlink channel associated with the first synchronization signal.

[0360] Optionally, the first synchronization signal is sent through some antenna ports in the first antenna port set; or, the first synchronization signal is sent through all antenna ports in the first antenna port set; or, the first antenna port set includes a main antenna port, and the first synchronization signal is sent through the main antenna port.

[0361] Optionally, some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, all antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, the first antenna port set includes a main antenna port, and the main antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, the first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

[0362] Optionally, there is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the terminal device also includes: a second determination module, used to determine at least one random access transmission opportunity in the first random access transmission opportunity set based on the second association relationship; a first sending module, used to send a random access signal through the at least one random access transmission opportunity.

[0363] Optionally, the first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

[0364] Optionally, the second association relationship is predefined or preconfigured.

[0365] Optionally, the terminal device sends a random access signal through the at least one random access transmission opportunity, including at least one of the following situations: the terminal device sends a random access signal to the antenna port that sends the first synchronization signal in the first antenna port set; or, the terminal device sends a random access signal to some antenna ports in the first antenna port set; or, the terminal device sends a random access signal to all antenna ports in the first antenna port set; or, the terminal device sends a random access signal to the main antenna port in the first antenna port set; or, the terminal device sends a random access signal to the secondary antenna port in the first antenna port set.

[0366] Optionally, the terminal device also includes a second detection module, which is used to: detect a random access response sent through at least one antenna port in the first antenna port set; or, the first antenna port set includes a main antenna port, and detect a random access response sent through the main antenna port; wherein the random access response is a response to the random access signal sent by the terminal device.

[0367] Optionally, at least one antenna port in the first antenna port set is used to transmit first indication information, and the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; an identifier of the antenna ports included in the first antenna port set; an identifier of the primary antenna port in the first antenna port set; an identifier of the secondary antenna port in the first antenna port set; an identifier of the antenna port in the first antenna port set that sends the first synchronization signal; an identifier of the antenna port in the first antenna port set that detects the random access signal; an identifier of the antenna port in the first antenna port set that sends the random access response; an index of the synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of the synchronization signal associated with the first antenna port set; an index of the synchronization signal for which the antenna ports in the first antenna port set need to perform rate matching when performing data transmission; a type of quasi-co-location relationship associated with the first antenna port set; and an association relationship between the first antenna port set and the first random access transmission opportunity set.

[0368] Optionally, the first indication information is transmitted through the antenna port that sends the first synchronization signal in the first antenna port set; or the first indication information is transmitted through the antenna port that detects the random access signal in the first antenna port set; or the first indication information is transmitted through all antenna ports in the first antenna port set.

[0369] Optionally, when the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

[0370] Optionally, the at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

[0371] Optionally, the first synchronization signal is sent according to a third association relationship, and the first determination module is further used to: determine the second antenna port according to the first synchronization signal and the third association relationship.

[0372] Optionally, the third association relationship includes at least one of the following: a correspondence between a synchronization signal and an antenna port; a correspondence between a synchronization signal and multiple antenna ports; a correspondence between multiple synchronization signals and one antenna port; a one-to-one correspondence between multiple synchronization signals and multiple antenna ports; a correspondence between a synchronization signal index and an antenna port identifier; a correspondence between a synchronization signal index and multiple antenna port identifiers; a correspondence between multiple synchronization signal indexes and one antenna port identifier; a one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

[0373] Optionally, the first determination module is further used to: determine an identifier of the second antenna port according to the first synchronization signal.

[0374] Optionally, the identifier of the second antenna port is determined based on one or more of the following information: the index of the first synchronization signal; the synchronization signal sequence corresponding to the first synchronization signal; and information transmitted in the downlink channel associated with the first synchronization signal.

[0375] Optionally, the first synchronization signal is sent through the second antenna port; and / or the second antenna port does not send a synchronization signal that is not associated with the second antenna port.

[0376] Optionally, there is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the terminal device also includes: a third determination module, used to determine at least one random access transmission opportunity in the second random access transmission opportunity set based on the fourth association relationship, and send a random access signal through the at least one random access transmission opportunity; and / or, a third detection module, used to detect a random access response sent through the second antenna port; wherein the random access response is a response to the random access signal sent by the terminal device.

[0377] Optionally, the terminal device sends a random access signal through the at least one random access transmission opportunity, including: the terminal device sends a random access signal to the second antenna port through the at least one random access transmission opportunity.

[0378] Optionally, the first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

[0379] Optionally, the fourth association relationship is predefined or preconfigured.

[0380] Optionally, the second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network in which the second antenna port is located; an index of a synchronization signal associated with the second antenna port; an index of a synchronization signal that the second antenna port needs to rate match when performing data transmission; a type of quasi-co-site relationship associated with the second antenna port; and an association relationship between the second antenna port and a second random access transmission opportunity set.

[0381] Optionally, the terminal device also includes: a second sending module, used to send third indication information to the network device, and the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, where N and M are positive integers.

[0382] Optionally, the third indication information is used to determine the M antenna ports selected by the terminal device, including: the third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; wherein, the M value is predefined or preconfigured, or, the M value is determined based on a third threshold value, and the third threshold value is predefined or preconfigured.

[0383] Optionally, the third indication information is used to determine the N synchronization signals selected by the terminal device, including: the third indication information is used to indicate the index of the N synchronization signals selected by the terminal device; wherein, the N value is predefined or preconfigured, or, the N value is determined based on a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

[0384] Optionally, the third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

[0385] Optionally, the first antenna port set associated with the first synchronization signal is determined based on predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined based on predefined or preconfigured information.

[0386] FIG14 is a schematic diagram of the structure of a network device according to an embodiment of the present application. The network device 1400 shown in FIG14 may include a first sending module 1410 .

[0387] The first sending module 1410 may be configured to send a synchronization signal; wherein the synchronization signal includes a first synchronization signal, and the first synchronization signal is used to determine at least one antenna port associated with the first synchronization signal.

[0388] Optionally, the at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

[0389] Optionally, the first synchronization signal is sent according to a first association relationship, and the first synchronization signal and the first association relationship are used to determine the first antenna port set.

[0390] Optionally, the first association relationship includes at least one of the following: a correspondence between a synchronization signal and an antenna port set; a correspondence between a synchronization signal and multiple antenna port sets; a correspondence between multiple synchronization signals and an antenna port set; a one-to-one correspondence between multiple synchronization signals and multiple antenna port sets; a correspondence between a synchronization signal index and an antenna port set identifier; a correspondence between a synchronization signal index and multiple antenna port set identifiers; a correspondence between multiple synchronization signal indexes and an antenna port set identifier; a one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

[0391] Optionally, the first synchronization signal is used to determine the identifier of the first antenna port set; or, the first synchronization signal is used to determine the identifier of at least one antenna port in the first antenna port set.

[0392] Optionally, the identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined based on one or more of the following information: the index of the first synchronization signal; the synchronization signal sequence corresponding to the first synchronization signal; and the information transmitted in the downlink channel associated with the first synchronization signal.

[0393] Optionally, the first synchronization signal is sent through some antenna ports in the first antenna port set; or, the first synchronization signal is sent through all antenna ports in the first antenna port set; or, the first antenna port set includes a main antenna port, and the first synchronization signal is sent through the main antenna port.

[0394] Optionally, some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, all antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, the first antenna port set includes a main antenna port, and the main antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, the first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

[0395] Optionally, there is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the network device also includes: a first receiving module 1420, used to receive a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set; wherein, the at least one random access transmission opportunity is determined based on the second association relationship.

[0396] Optionally, the first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

[0397] Optionally, the second association relationship is predefined or preconfigured.

[0398] Optionally, the network device receives a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set, including at least one of the following situations: the network device receives the random access signal through the antenna port that sends the first synchronization signal in the first antenna port set; or, the network device receives the random access signal through some antenna ports in the first antenna port set; or, the network device receives the random access signal through all antenna ports in the first antenna port set; or, the network device receives the random access signal through the main antenna port in the first antenna port set; or, the network device receives the random access signal through the secondary antenna port in the first antenna port set.

[0399] Optionally, the network device also includes a second sending module, which is used to: send a random access response through at least one antenna port in the first antenna port set; or, the first antenna port set includes a main antenna port, and sends a random access response through the main antenna port; wherein the random access response is a response to the random access signal sent by the terminal device.

[0400] Optionally, at least one antenna port in the first antenna port set is used to transmit first indication information, and the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; an identifier of the antenna ports included in the first antenna port set; an identifier of the primary antenna port in the first antenna port set; an identifier of the secondary antenna port in the first antenna port set; an identifier of the antenna port in the first antenna port set that sends the first synchronization signal; an identifier of the antenna port in the first antenna port set that detects the random access signal; an identifier of the antenna port in the first antenna port set that sends the random access response; an index of the synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of the synchronization signal associated with the first antenna port set; an index of the synchronization signal for which the antenna ports in the first antenna port set need to perform rate matching when performing data transmission; a type of quasi-co-location relationship associated with the first antenna port set; and an association relationship between the first antenna port set and the first random access transmission opportunity set.

[0401] Optionally, the first indication information is transmitted through the antenna port that sends the first synchronization signal in the first antenna port set; or the first indication information is transmitted through the antenna port that detects the random access signal in the first antenna port set; or the first indication information is transmitted through all antenna ports in the first antenna port set.

[0402] Optionally, when the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

[0403] Optionally, the at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

[0404] Optionally, the first synchronization signal is sent according to a third association relationship, and the first synchronization signal and the third association relationship are used to determine the second antenna port.

[0405] Optionally, the third association relationship includes at least one of the following: a correspondence between a synchronization signal and an antenna port; a correspondence between a synchronization signal and multiple antenna ports; a correspondence between multiple synchronization signals and one antenna port; a one-to-one correspondence between multiple synchronization signals and multiple antenna ports; a correspondence between a synchronization signal index and an antenna port identifier; a correspondence between a synchronization signal index and multiple antenna port identifiers; a correspondence between multiple synchronization signal indexes and one antenna port identifier; a one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

[0406] Optionally, the first synchronization signal is used to determine an identifier of the second antenna port.

[0407] Optionally, the identifier of the second antenna port is determined based on one or more of the following information: the index of the first synchronization signal; the synchronization signal sequence corresponding to the first synchronization signal; and information transmitted in the downlink channel associated with the first synchronization signal.

[0408] Optionally, the first synchronization signal is sent through the second antenna port; and / or the second antenna port does not send a synchronization signal that is not associated with the second antenna port.

[0409] Optionally, there is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the network device also includes: a second receiving module for receiving a random access signal; and / or a third sending module for sending a random access response through the second antenna port; wherein the random access signal is sent through at least one random access transmission opportunity in the second random access transmission opportunity set, the at least one random access transmission opportunity is determined based on the fourth association relationship, and the random access response is a response to the random access signal sent by the terminal device.

[0410] Optionally, the random access signal is sent to the second antenna port through the at least one random access transmission opportunity.

[0411] Optionally, the first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

[0412] Optionally, the fourth association relationship is predefined or preconfigured.

[0413] Optionally, the second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network in which the second antenna port is located; an index of a synchronization signal associated with the second antenna port; an index of a synchronization signal that the second antenna port needs to rate match when performing data transmission; a type of quasi-co-site relationship associated with the second antenna port; and an association relationship between the second antenna port and a second random access transmission opportunity set.

[0414] Optionally, the network device also includes: a third receiving module, used to receive third indication information sent by the terminal device, and the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, where N and M are positive integers.

[0415] Optionally, the third indication information is used to determine the M antenna ports selected by the terminal device, including: the third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; wherein, the M value is predefined or preconfigured, or, the M value is determined based on a third threshold value, and the third threshold value is predefined or preconfigured.

[0416] Optionally, the third indication information is used to determine the N synchronization signals selected by the terminal device, including: the third indication information is used to indicate the index of the N synchronization signals selected by the terminal device; wherein, the N value is predefined or preconfigured, or, the N value is determined based on a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

[0417] Optionally, the third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

[0418] Optionally, the first antenna port set associated with the first synchronization signal is determined based on predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined based on predefined or preconfigured information.

[0419] Figure 15 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 15 indicate that the unit or module is optional. Apparatus 1500 may be used to implement the method described in the above method embodiment. Apparatus 1500 may be a chip, a terminal device, or a network device.

[0420] The device 1500 may include one or more processors 1510. The processor 1510 may support the device 1500 to implement the method described in the method embodiment above. The processor 1510 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0421] The apparatus 1500 may further include one or more memories 1520. The memories 1520 store programs that can be executed by the processor 1510, causing the processor 1510 to perform the methods described in the above method embodiments. The memories 1520 may be independent of the processor 1510 or integrated into the processor 1510.

[0422] The apparatus 1500 may further include a transceiver 1530. The processor 1510 may communicate with other devices or chips via the transceiver 1530. For example, the processor 1510 may transmit and receive data with other devices or chips via the transceiver 1530.

[0423] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0424] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0425] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0426] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0427] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0428] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0429] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0430] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0431] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0432] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0433] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0434] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0435] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0436] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0437] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0438] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0439] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: The terminal device detects the synchronization signal sent by the network device; After the terminal device detects the first synchronization signal, the terminal device determines at least one antenna port associated with the first synchronization signal according to the first synchronization signal.

2. The method according to claim 1, characterized in that The at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

3. The method according to claim 2, characterized in that The first synchronization signal is sent according to a first association relationship, and the terminal device determines at least one antenna port associated with the first synchronization signal according to the first synchronization signal, including: The terminal device determines the first antenna port set according to the first synchronization signal and the first association relationship.

4. The method according to claim 3, characterized in that The first association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port set; A correspondence between a synchronization signal and multiple antenna port sets; The correspondence between multiple synchronization signals and an antenna port set; One-to-one correspondence between multiple synchronization signals and multiple antenna port sets; A correspondence between a synchronization signal index and an antenna port set identifier; A correspondence between a synchronization signal index and multiple antenna port set identifiers; A correspondence between multiple synchronization signal indexes and an antenna port set identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

5. The method according to any one of claims 2 to 4, characterized in that: The terminal device determines, according to the first synchronization signal, at least one antenna port associated with the first synchronization signal, including: The terminal device determines the identifier of the first antenna port set according to the first synchronization signal; or, The terminal device determines an identifier of at least one antenna port in the first antenna port set based on the first synchronization signal.

6. The method according to claim 5, characterized in that The identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

7. The method according to any one of claims 2 to 6, characterized in that: The first synchronization signal is sent through some antenna ports in the first antenna port set; or, The first synchronization signal is sent through all antenna ports in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the first synchronization signal is sent through the primary antenna port.

8. The method according to any one of claims 2 to 7, characterized in that: Some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, All antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, The first antenna port set includes a primary antenna port, and the primary antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, The first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

9. The method according to any one of claims 2 to 8, characterized in that: There is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the method further includes: The terminal device determines at least one random access transmission opportunity in the first random access transmission opportunity set according to the second association relationship; The terminal device sends a random access signal through the at least one random access transmission opportunity.

10. The method according to claim 9, characterized in that The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

11. The method according to claim 9 or 10, characterized in that: The second association relationship is predefined or preconfigured.

12. The method according to any one of claims 9 to 11, characterized in that: The terminal device sends a random access signal through the at least one random access transmission opportunity, including at least one of the following situations: The terminal device sends a random access signal to the antenna port in the first antenna port set that sends the first synchronization signal; or, The terminal device sends a random access signal to some antenna ports in the first antenna port set; or, The terminal device sends a random access signal to all antenna ports in the first antenna port set; or, The terminal device sends a random access signal to a primary antenna port in the first antenna port set; or, The terminal device sends a random access signal to a secondary antenna port in the first antenna port set.

13. The method according to any one of claims 9 to 12, characterized in that: The method further comprises: The terminal device detects a random access response sent through at least one antenna port in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the terminal device detects a random access response sent through the primary antenna port; The random access response is a response to a random access signal sent by the terminal device.

14. The method according to any one of claims 2 to 13, characterized in that At least one antenna port in the first antenna port set is used to transmit first indication information, where the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; identifiers of antenna ports included in the first antenna port set; an identifier of a primary antenna port in the first antenna port set; an identifier of a secondary antenna port in the first antenna port set; an identifier of an antenna port in the first antenna port set that sends the first synchronization signal; an identifier of an antenna port in the first antenna port set for detecting a random access signal; an identifier of an antenna port in the first antenna port set that sends a random access response; An index of a synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of a synchronization signal associated with the first antenna port set; An index of a synchronization signal for which rate matching is required for the antenna ports in the first antenna port set when performing data transmission; a type of quasi co-location relationship associated with the first antenna port set; The association relationship between the first antenna port set and the first random access transmission opportunity set.

15. The method according to claim 14, characterized in that The first indication information is transmitted through an antenna port in the first antenna port set that sends the first synchronization signal; or The first indication information is transmitted through an antenna port in the first antenna port set that detects a random access signal; or The first indication information is transmitted through all antenna ports in the first antenna port set.

16. The method according to any one of claims 2 to 15, characterized in that When the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

17. The method according to claim 1, characterized in that The at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

18. The method according to claim 17, characterized in that The first synchronization signal is sent according to the third association relationship, and the terminal device determines at least one antenna port associated with the first synchronization signal according to the first synchronization signal, including: The terminal device determines the second antenna port according to the first synchronization signal and the third association relationship.

19. The method according to claim 18, characterized in that The third association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port; The correspondence between a synchronization signal and multiple antenna ports; The correspondence between multiple synchronization signals and one antenna port; One-to-one correspondence between multiple synchronization signals and multiple antenna ports; A correspondence between a synchronization signal index and an antenna port identifier; A correspondence between a synchronization signal index and multiple antenna port identifiers; A correspondence between multiple synchronization signal indexes and an antenna port identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

20. The method according to any one of claims 17 to 19, characterized in that The terminal device determines, according to the first synchronization signal, at least one antenna port associated with the first synchronization signal, including: The terminal device determines the identifier of the second antenna port based on the first synchronization signal.

21. The method according to claim 20, characterized in that The identifier of the second antenna port is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

22. The method according to any one of claims 17 to 21, characterized in that The first synchronization signal is sent through the second antenna port; and / or, The second antenna port does not send a synchronization signal that is not associated with the second antenna port.

23. The method according to any one of claims 17 to 22, characterized in that There is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the method further includes: The terminal device determines at least one random access transmission opportunity in the second random access transmission opportunity set according to the fourth association relationship, and sends a random access signal through the at least one random access transmission opportunity; and / or, The terminal device detects a random access response sent through the second antenna port; The random access response is a response to a random access signal sent by the terminal device.

24. The method according to claim 23, characterized in that The terminal device sending a random access signal through the at least one random access transmission opportunity includes: The terminal device sends a random access signal to the second antenna port through the at least one random access transmission opportunity.

25. The method according to claim 23 or 24, characterized in that The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

26. The method according to any one of claims 23 to 25, characterized in that The fourth association relationship is predefined or preconfigured.

27. The method according to any one of claims 17 to 26, characterized in that The second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network where the second antenna port is located; an index of a synchronization signal associated with the second antenna port; An index of a synchronization signal for which the second antenna port needs to perform rate matching when performing data transmission; a type of quasi co-location relationship associated with the second antenna port; An association relationship between the second antenna port and a second random access transmission opportunity set.

28. The method according to any one of claims 17 to 27, characterized in that The method further comprises: The terminal device sends third indication information to the network device, where the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, where N and M are positive integers.

29. The method according to claim 28, characterized in that The third indication information is used to determine the M antenna ports selected by the terminal device, including: The third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; The M value is predefined or preconfigured, or the M value is determined according to a third threshold value, and the third threshold value is predefined or preconfigured.

30. The method according to claim 28 or 29, characterized in that The third indication information is used to determine the N synchronization signals selected by the terminal device, including: The third indication information is used to indicate the indexes of the N synchronization signals selected by the terminal device; The N value is predefined or preconfigured, or the N value is determined according to a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

31. The method according to any one of claims 28 to 30, characterized in that The third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

32. The method according to any one of claims 1 to 31, characterized in that The first antenna port set associated with the first synchronization signal is determined according to predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined according to predefined or preconfigured information.

33. A wireless communication method, characterized in that: include: The network device sends a synchronization signal; The synchronization signal includes a first synchronization signal, and the first synchronization signal is used to determine at least one antenna port associated with the first synchronization signal.

34. The method according to claim 33, characterized in that The at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

35. The method according to claim 34, characterized in that The first synchronization signal is sent according to a first association relationship, and the first synchronization signal and the first association relationship are used to determine the first antenna port set.

36. The method according to claim 35, characterized in that The first association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port set; A correspondence between a synchronization signal and multiple antenna port sets; The correspondence between multiple synchronization signals and an antenna port set; One-to-one correspondence between multiple synchronization signals and multiple antenna port sets; A correspondence between a synchronization signal index and an antenna port set identifier; A correspondence between a synchronization signal index and multiple antenna port set identifiers; A correspondence between multiple synchronization signal indexes and an antenna port set identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

37. The method according to any one of claims 34 to 36, characterized in that The first synchronization signal is used to determine an identifier of the first antenna port set; or, the first synchronization signal is used to determine an identifier of at least one antenna port in the first antenna port set.

38. The method according to claim 37, characterized in that The identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

39. The method according to any one of claims 34 to 38, characterized in that The first synchronization signal is sent through some antenna ports in the first antenna port set; or, The first synchronization signal is sent through all antenna ports in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the first synchronization signal is sent through the primary antenna port.

40. The method according to any one of claims 34 to 39, characterized in that Some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, All antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, The first antenna port set includes a primary antenna port, and the primary antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, The first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

41. The method according to any one of claims 34 to 40, characterized in that There is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the method further includes: The network device receives a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set; The at least one random access transmission opportunity is determined according to the second association relationship.

42. The method according to claim 41, characterized in that The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

43. The method according to claim 41 or 42, characterized in that The second association relationship is predefined or preconfigured.

44. The method according to any one of claims 41 to 43, characterized in that The network device receives a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set, including at least one of the following situations: The network device receives a random access signal through an antenna port in the first antenna port set that sends the first synchronization signal; or, The network device receives a random access signal through some antenna ports in the first antenna port set; or, The network device receives a random access signal through all antenna ports in the first antenna port set; or, The network device receives a random access signal through a primary antenna port in the first antenna port set; or, The network device receives a random access signal through a secondary antenna port in the first antenna port set.

45. The method according to any one of claims 41 to 44, characterized in that The method further comprises: The network device sends a random access response through at least one antenna port in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the network device sends a random access response through the primary antenna port; The random access response is a response to a random access signal sent by a terminal device.

46. ​​The method according to any one of claims 34 to 45, characterized in that At least one antenna port in the first antenna port set is used to transmit first indication information, where the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; identifiers of antenna ports included in the first antenna port set; an identifier of a primary antenna port in the first antenna port set; an identifier of a secondary antenna port in the first antenna port set; an identifier of an antenna port in the first antenna port set that sends the first synchronization signal; an identifier of an antenna port in the first antenna port set for detecting a random access signal; an identifier of an antenna port in the first antenna port set that sends a random access response; An index of a synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of a synchronization signal associated with the first antenna port set; An index of a synchronization signal for which rate matching is required for the antenna ports in the first antenna port set when performing data transmission; a type of quasi co-location relationship associated with the first antenna port set; The association relationship between the first antenna port set and the first random access transmission opportunity set.

47. The method according to claim 46, characterized in that The first indication information is transmitted through an antenna port in the first antenna port set that sends the first synchronization signal; or The first indication information is transmitted through an antenna port in the first antenna port set that detects a random access signal; or The first indication information is transmitted through all antenna ports in the first antenna port set.

48. The method according to any one of claims 34 to 47, characterized in that When the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

49. The method according to claim 33, characterized in that The at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

50. The method according to claim 49, characterized in that The first synchronization signal is sent according to a third association relationship, and the first synchronization signal and the third association relationship are used to determine the second antenna port.

51. The method according to claim 50, characterized in that The third association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port; The correspondence between a synchronization signal and multiple antenna ports; The correspondence between multiple synchronization signals and one antenna port; One-to-one correspondence between multiple synchronization signals and multiple antenna ports; A correspondence between a synchronization signal index and an antenna port identifier; A correspondence between a synchronization signal index and multiple antenna port identifiers; A correspondence between multiple synchronization signal indexes and an antenna port identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

52. The method according to any one of claims 49 to 51, characterized in that The first synchronization signal is used to determine an identifier of the second antenna port.

53. The method according to claim 52, characterized in that The identifier of the second antenna port is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

54. The method according to any one of claims 49 to 53, characterized in that The first synchronization signal is sent through the second antenna port; and / or, The second antenna port does not send a synchronization signal that is not associated with the second antenna port.

55. The method according to any one of claims 49 to 54, characterized in that There is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the method further includes: The network device receives a random access signal; and / or The network device sends a random access response through the second antenna port; The random access signal is transmitted through at least one random access transmission opportunity in the second random access transmission opportunity set. The at least one random access transmission opportunity is determined according to the fourth association relationship, and the random access response is a response to a random access signal sent by the terminal device.

56. The method according to claim 55, characterized in that The random access signal is sent to the second antenna port through the at least one random access transmission opportunity.

57. The method according to claim 55 or 56, characterized in that The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

58. The method according to any one of claims 55 to 57, characterized in that The fourth association relationship is predefined or preconfigured.

59. The method according to any one of claims 49 to 58, characterized in that The second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network where the second antenna port is located; an index of a synchronization signal associated with the second antenna port; An index of a synchronization signal for which the second antenna port needs to perform rate matching when performing data transmission; a type of quasi co-location relationship associated with the second antenna port; An association relationship between the second antenna port and a second random access transmission opportunity set.

60. The method according to any one of claims 49 to 59, characterized in that The method further comprises: The network device receives third indication information sent by the terminal device, and the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, wherein N and M are positive integers.

61. The method according to claim 60, characterized in that The third indication information is used to determine the M antenna ports selected by the terminal device, including: The third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; The M value is predefined or preconfigured, or the M value is determined according to a third threshold value, and the third threshold value is predefined or preconfigured.

62. The method according to claim 60 or 61, characterized in that The third indication information is used to determine the N synchronization signals selected by the terminal device, including: The third indication information is used to indicate the indexes of the N synchronization signals selected by the terminal device; The N value is predefined or preconfigured, or the N value is determined according to a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

63. The method according to any one of claims 60 to 62, characterized in that The third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

64. The method according to any one of claims 33 to 63, characterized in that The first antenna port set associated with the first synchronization signal is determined according to predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined according to predefined or preconfigured information.

65. A terminal device, characterized in that: include: A first detection module, used to detect a synchronization signal sent by a network device; The first determination module is used to determine at least one antenna port associated with the first synchronization signal according to the first synchronization signal after the terminal device detects the first synchronization signal.

66. The terminal device according to claim 65, characterized in that: The at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

67. The terminal device according to claim 66, characterized in that: The first synchronization signal is sent according to the first association relationship, and the first determination module is further used for: The first antenna port set is determined according to the first synchronization signal and the first association relationship.

68. The terminal device according to claim 67, characterized in that: The first association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port set; A correspondence between a synchronization signal and multiple antenna port sets; The correspondence between multiple synchronization signals and an antenna port set; One-to-one correspondence between multiple synchronization signals and multiple antenna port sets; A correspondence between a synchronization signal index and an antenna port set identifier; A correspondence between a synchronization signal index and multiple antenna port set identifiers; A correspondence between multiple synchronization signal indexes and an antenna port set identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

69. The terminal device according to any one of claims 66-68, characterized in that: The first determining module is further configured to: determining an identifier of the first antenna port set according to the first synchronization signal; or, An identifier of at least one antenna port in the first antenna port set is determined according to the first synchronization signal.

70. The terminal device according to claim 69, characterized in that: The identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

71. The terminal device according to any one of claims 66-70, characterized in that: The first synchronization signal is sent through some antenna ports in the first antenna port set; or, The first synchronization signal is sent through all antenna ports in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the first synchronization signal is sent through the primary antenna port.

72. The terminal device according to any one of claims 66 to 71, characterized in that: Some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, All antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, The first antenna port set includes a primary antenna port, and the primary antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, The first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

73. The terminal device according to any one of claims 66-72, characterized in that: There is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the terminal device further includes: A second determining module, configured to determine at least one random access transmission opportunity in the first random access transmission opportunity set according to the second association relationship; The first sending module is configured to send a random access signal through the at least one random access transmission opportunity.

74. The terminal device according to claim 73, characterized in that: The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

75. The terminal device according to claim 73 or 74, characterized in that: The second association relationship is predefined or preconfigured.

76. The terminal device according to any one of claims 73-75, characterized in that: The terminal device sends a random access signal through the at least one random access transmission opportunity, including at least one of the following situations: The terminal device sends a random access signal to the antenna port in the first antenna port set that sends the first synchronization signal; or, The terminal device sends a random access signal to some antenna ports in the first antenna port set; or, The terminal device sends a random access signal to all antenna ports in the first antenna port set; or, The terminal device sends a random access signal to a primary antenna port in the first antenna port set; or, The terminal device sends a random access signal to a secondary antenna port in the first antenna port set.

77. The terminal device according to any one of claims 73-76, characterized in that: The terminal device further includes a second detection module, wherein the second detection module is configured to: detecting a random access response sent through at least one antenna port in the first antenna port set; or, The first antenna port set includes a primary antenna port, and detecting a random access response sent through the primary antenna port; The random access response is a response to a random access signal sent by the terminal device.

78. The terminal device according to any one of claims 66-77, characterized in that: At least one antenna port in the first antenna port set is used to transmit first indication information, where the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; identifiers of antenna ports included in the first antenna port set; an identifier of a primary antenna port in the first antenna port set; an identifier of a secondary antenna port in the first antenna port set; an identifier of an antenna port in the first antenna port set that sends the first synchronization signal; an identifier of an antenna port in the first antenna port set for detecting a random access signal; an identifier of an antenna port in the first antenna port set that sends a random access response; An index of a synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of a synchronization signal associated with the first antenna port set; An index of a synchronization signal for which rate matching is required for the antenna ports in the first antenna port set when performing data transmission; a type of quasi co-location relationship associated with the first antenna port set; The association relationship between the first antenna port set and the first random access transmission opportunity set.

79. The terminal device according to claim 78, characterized in that: The first indication information is transmitted through an antenna port in the first antenna port set that sends the first synchronization signal; or The first indication information is transmitted through an antenna port in the first antenna port set that detects a random access signal; or The first indication information is transmitted through all antenna ports in the first antenna port set.

80. The terminal device according to any one of claims 66-79, characterized in that: When the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

81. The terminal device according to claim 65, characterized in that: The at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

82. The terminal device according to claim 81, characterized in that: The first synchronization signal is sent according to the third association relationship, and the first determination module is further used for: The second antenna port is determined according to the first synchronization signal and the third association relationship.

83. The terminal device according to claim 82, characterized in that: The third association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port; The correspondence between a synchronization signal and multiple antenna ports; The correspondence between multiple synchronization signals and one antenna port; One-to-one correspondence between multiple synchronization signals and multiple antenna ports; A correspondence between a synchronization signal index and an antenna port identifier; A correspondence between a synchronization signal index and multiple antenna port identifiers; A correspondence between multiple synchronization signal indexes and an antenna port identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

84. The terminal device according to any one of claims 81-83, characterized in that: The first determining module is further configured to: An identifier of the second antenna port is determined according to the first synchronization signal.

85. The terminal device according to claim 84, characterized in that: The identifier of the second antenna port is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

86. The terminal device according to any one of claims 81-85, characterized in that: The first synchronization signal is sent through the second antenna port; and / or, The second antenna port does not send a synchronization signal that is not associated with the second antenna port.

87. The terminal device according to any one of claims 81-86, characterized in that: There is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the terminal device further includes: a third determining module, configured to determine at least one random access transmission opportunity in the second random access transmission opportunity set according to the fourth association relationship, and send a random access signal through the at least one random access transmission opportunity; and / or, A third detection module, configured to detect a random access response sent through the second antenna port; The random access response is a response to a random access signal sent by the terminal device.

88. The terminal device according to claim 87, characterized in that: The terminal device sending a random access signal through the at least one random access transmission opportunity includes: The terminal device sends a random access signal to the second antenna port through the at least one random access transmission opportunity.

89. The terminal device according to claim 87 or 88, characterized in that: The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

90. The terminal device according to any one of claims 87-89, characterized in that: The fourth association relationship is predefined or preconfigured.

91. The terminal device according to any one of claims 81-90, characterized in that: The second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network where the second antenna port is located; an index of a synchronization signal associated with the second antenna port; An index of a synchronization signal for which the second antenna port needs to perform rate matching when performing data transmission; a type of quasi co-location relationship associated with the second antenna port; An association relationship between the second antenna port and a second random access transmission opportunity set.

92. The terminal device according to any one of claims 81 to 91, characterized in that: The terminal device further includes: The second sending module is used to send third indication information to the network device, and the third indication information is used to determine the M antenna ports selected by the terminal device and / or the N synchronization signals selected by the terminal device, wherein N and M are positive integers.

93. The terminal device according to claim 92, characterized in that: The third indication information is used to determine the M antenna ports selected by the terminal device, including: The third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; The M value is predefined or preconfigured, or the M value is determined according to a third threshold value, and the third threshold value is predefined or preconfigured.

94. The terminal device according to claim 92 or 93, characterized in that: The third indication information is used to determine the N synchronization signals selected by the terminal device, including: The third indication information is used to indicate the indexes of the N synchronization signals selected by the terminal device; The N value is predefined or preconfigured, or the N value is determined according to a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

95. The terminal device according to any one of claims 92-94, characterized in that: The third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

96. The terminal device according to any one of claims 65-95, characterized in that: The first antenna port set associated with the first synchronization signal is determined according to predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined according to predefined or preconfigured information.

97. A network device, characterized in that: include: A first sending module, used for sending a synchronization signal; The synchronization signal includes a first synchronization signal, and the first synchronization signal is used to determine at least one antenna port associated with the first synchronization signal.

98. The network device according to claim 97, characterized in that: The at least one antenna port is an antenna port in a first antenna port set, and the first synchronization signal is associated with the first antenna port set.

99. The network device according to claim 98, characterized in that: The first synchronization signal is sent according to a first association relationship, and the first synchronization signal and the first association relationship are used to determine the first antenna port set.

100. The network device according to claim 99, characterized in that: The first association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port set; A correspondence between a synchronization signal and multiple antenna port sets; The correspondence between multiple synchronization signals and an antenna port set; One-to-one correspondence between multiple synchronization signals and multiple antenna port sets; A correspondence between a synchronization signal index and an antenna port set identifier; A correspondence between a synchronization signal index and multiple antenna port set identifiers; A correspondence between multiple synchronization signal indexes and an antenna port set identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port set identifiers.

101. The network device according to any one of claims 98-100, characterized in that: The first synchronization signal is used to determine an identifier of the first antenna port set; or, the first synchronization signal is used to determine an identifier of at least one antenna port in the first antenna port set.

102. The network device according to claim 101, characterized in that: The identifier of the first antenna port set or the identifier of at least one antenna port in the first antenna port set is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

103. The network device according to any one of claims 98 to 102, characterized in that: The first synchronization signal is sent through some antenna ports in the first antenna port set; or, The first synchronization signal is sent through all antenna ports in the first antenna port set; or, The first antenna port set includes a primary antenna port, and the first synchronization signal is sent through the primary antenna port.

104. The network device according to any one of claims 98 to 103, characterized in that: Some antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, All antenna ports in the first antenna port set do not send synchronization signals that are not associated with the first antenna port set; or, The first antenna port set includes a primary antenna port, and the primary antenna port does not send a synchronization signal that is not associated with the first antenna port set; or, The first antenna port set includes a secondary antenna port, and the secondary antenna port does not send a synchronization signal that is not associated with the first antenna port set.

105. The network device according to any one of claims 98 to 104, characterized in that: There is a second association relationship between the first antenna port set and the first random access transmission opportunity set, and / or there is a second association relationship between the first synchronization signal and the first random access transmission opportunity set, and the network device further includes: A first receiving module, configured to receive a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set; The at least one random access transmission opportunity is determined according to the second association relationship.

106. The network device according to claim 105, characterized in that The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a first threshold.

107. The network device according to claim 105 or 106, characterized in that: The second association relationship is predefined or preconfigured.

108. The network device according to any one of claims 105-107, characterized in that: The network device receives a random access signal through at least one random access transmission opportunity in the first random transmission opportunity set, including at least one of the following situations: The network device receives a random access signal through an antenna port in the first antenna port set that sends the first synchronization signal; or, The network device receives a random access signal through some antenna ports in the first antenna port set; or, The network device receives a random access signal through all antenna ports in the first antenna port set; or, The network device receives a random access signal through a primary antenna port in the first antenna port set; or, The network device receives a random access signal through a secondary antenna port in the first antenna port set.

109. The network device according to any one of claims 105-108, characterized in that: The network device further includes a second sending module, wherein the second sending module is configured to: Sending a random access response through at least one antenna port in the first antenna port set; or, The first antenna port set includes a primary antenna port, and a random access response is sent through the primary antenna port; The random access response is a response to a random access signal sent by a terminal device.

110. The network device according to any one of claims 98 to 109, characterized in that: At least one antenna port in the first antenna port set is used to transmit first indication information, where the first indication information is used to determine at least one of the following information: an identifier of the first antenna port set; identifiers of antenna ports included in the first antenna port set; an identifier of a primary antenna port in the first antenna port set; an identifier of a secondary antenna port in the first antenna port set; an identifier of an antenna port in the first antenna port set that sends the first synchronization signal; an identifier of an antenna port in the first antenna port set for detecting a random access signal; an identifier of an antenna port in the first antenna port set that sends a random access response; An index of a synchronization signal transmitted in the communication network in which the first antenna port set is located; an index of a synchronization signal associated with the first antenna port set; An index of a synchronization signal for which rate matching is required for the antenna ports in the first antenna port set when performing data transmission; a type of quasi co-location relationship associated with the first antenna port set; The association relationship between the first antenna port set and the first random access transmission opportunity set.

111. The network device according to claim 110, characterized in that: The first indication information is transmitted through an antenna port in the first antenna port set that sends the first synchronization signal; or The first indication information is transmitted through an antenna port in the first antenna port set that detects a random access signal; or The first indication information is transmitted through all antenna ports in the first antenna port set.

112. The network device according to any one of claims 98 to 111, characterized in that: When the first antenna port set includes two or more antenna ports, at least two antenna ports in the first antenna port set are distributed antenna ports, or any two antenna ports in the first antenna port set are distributed antenna ports.

113. The network device according to claim 97, characterized in that: The at least one antenna port includes a second antenna port, and the first synchronization signal is associated with the second antenna port.

114. The network device according to claim 113, characterized in that: The first synchronization signal is sent according to a third association relationship, and the first synchronization signal and the third association relationship are used to determine the second antenna port.

115. The network device according to claim 114, characterized in that The third association relationship includes at least one of the following: The correspondence between a synchronization signal and an antenna port; The correspondence between a synchronization signal and multiple antenna ports; The correspondence between multiple synchronization signals and one antenna port; One-to-one correspondence between multiple synchronization signals and multiple antenna ports; A correspondence between a synchronization signal index and an antenna port identifier; A correspondence between a synchronization signal index and multiple antenna port identifiers; A correspondence between multiple synchronization signal indexes and an antenna port identifier; A one-to-one correspondence between multiple synchronization signal indexes and multiple antenna port identifiers.

116. The network device according to any one of claims 113-115, characterized in that: The first synchronization signal is used to determine an identifier of the second antenna port.

117. The network device according to claim 116, characterized in that The identifier of the second antenna port is determined according to one or more of the following information: an index of the first synchronization signal; a synchronization signal sequence corresponding to the first synchronization signal; The information transmitted in the downlink channel associated with the first synchronization signal.

118. The network device according to any one of claims 113-117, characterized in that: The first synchronization signal is sent through the second antenna port; and / or, The second antenna port does not send a synchronization signal that is not associated with the second antenna port.

119. The network device according to any one of claims 113-118, characterized in that: There is a fourth association relationship between the second antenna port and the second random access transmission opportunity set, and / or there is a fourth association relationship between the first synchronization signal and the second random access transmission opportunity set, and the network device further includes: A second receiving module is configured to receive a random access signal; and / or A third sending module, configured to send a random access response through the second antenna port; The random access signal is sent through at least one random access transmission opportunity in the second random access transmission opportunity set, the at least one random access transmission opportunity is determined according to the fourth association relationship, and the random access response is a response to the random access signal sent by the terminal device.

120. The network device according to claim 119, characterized in that The random access signal is sent to the second antenna port through the at least one random access transmission opportunity.

121. The network device according to claim 119 or 120, characterized in that: The first synchronization signal includes a synchronization signal with the strongest received signal strength detected by the terminal device or a synchronization signal with a received signal strength exceeding a second threshold.

122. The network device according to any one of claims 119-121, characterized in that: The fourth association relationship is predefined or preconfigured.

123. The network device according to any one of claims 113-122, characterized in that: The second antenna port is used to transmit second indication information, and the second indication information is used to determine at least one of the following information: an identifier of the second antenna port; an index of a synchronization signal transmitted in the communication network where the second antenna port is located; an index of a synchronization signal associated with the second antenna port; An index of a synchronization signal for which the second antenna port needs to perform rate matching when performing data transmission; a type of quasi co-location relationship associated with the second antenna port; An association relationship between the second antenna port and a second random access transmission opportunity set.

124. The network device according to any one of claims 113-123, characterized in that: The network device also includes: A third receiving module is used to receive third indication information sent by the terminal device, and the third indication information is used to determine the terminal device The selected M antenna ports and / or the selected N synchronization signals by the terminal device, wherein N and M are positive integers.

125. The network device according to claim 124, characterized in that The third indication information is used to determine the M antenna ports selected by the terminal device, including: The third indication information is used to indicate the identifiers of the M antenna ports selected by the terminal device; The M value is predefined or preconfigured, or the M value is determined according to a third threshold value, and the third threshold value is predefined or preconfigured.

126. The network device according to claim 124 or 125, characterized in that: The third indication information is used to determine the N synchronization signals selected by the terminal device, including: The third indication information is used to indicate the indexes of the N synchronization signals selected by the terminal device; The N value is predefined or preconfigured, or the N value is determined according to a fourth threshold value, and the fourth threshold value is predefined or preconfigured.

127. The network device according to any one of claims 124-126, characterized in that: The third indication information is carried in one or more of the following transmissions: a random access signal, an uplink transmission scheduled by a random access response, and an uplink transmission after the random access process is completed.

128. The network device according to any one of claims 97-127, characterized in that: The first antenna port set associated with the first synchronization signal is determined according to predefined or preconfigured information; or the second antenna port associated with the first synchronization signal is determined according to predefined or preconfigured information.

129. A terminal device, characterized in that: The device comprises a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method as described in any one of claims 1 to 32.

130. A network device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the network device executes the method as described in any one of claims 33-64.

131. A device, characterized in that: It comprises a processor, which is used to call a program from a memory so that the device executes the method as described in any one of claims 1-64.

132. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory so that a device equipped with the chip executes a method as described in any one of claims 1 to 64.

133. A computer-readable storage medium, characterized in that: A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 64.

134. A computer program product, characterized in that It comprises a program which causes a computer to execute the method as claimed in any one of claims 1 to 64.

135. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1-64.

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