A communication method and apparatus

Abstract

This application relates to a communication method and apparatus. The terminal device receives a first synchronization broadcast block located at a first frequency domain position from the network device, and receives a second synchronization broadcast block located at a second frequency domain position from the network device. The terminal device determines a random access channel opportunity corresponding to the second frequency domain position. The terminal device determines, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the random access channel opportunity to which the second synchronization broadcast block is mapped among the random access channel opportunities corresponding to the second frequency domain position, so as to perform random access on the random access channel opportunity to which the second synchronization broadcast block is mapped. Correspondingly, the network device also determines, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the random access channel opportunity to which the second synchronization broadcast block is mapped among the random access channel opportunities corresponding to the second frequency domain position. In this way, when synchronous broadcast block frequency division multiplexing is applied, the network device can know the synchronous broadcast block selected by the terminal device.

Description

Technical Field

[0001] This application relates to the field of mobile communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] In the existing solution, the synchronization broadcast blocks in a synchronization broadcast set are all sent at one frequency domain position. To reduce the power consumption of network devices, frequency division multiplexing of synchronization broadcast blocks can be applied, that is, the synchronization broadcast blocks in the same synchronization broadcast set can be located at multiple frequency domain positions.

[0003] When a terminal device performs random access, it will select a synchronization broadcast block and perform random access at the random access channel opportunity mapped to the synchronization broadcast block. In the case where frequency division multiplexing of synchronization broadcast blocks is applied, if the existing mapping method between synchronization broadcast blocks and random access channel opportunities is followed, the network device may not be able to know the synchronization broadcast block selected by the terminal device. Summary of the Invention

[0004] Embodiments of this application provide a communication method, apparatus, and device for enabling a network device to know the synchronization broadcast block selected by a terminal device when frequency division multiplexing of synchronization broadcast blocks is applied.

[0005] In a first aspect, a first communication method is provided. The method includes: receiving a first synchronization broadcast block located at a first frequency domain position; receiving a second synchronization broadcast block located at a second frequency domain position; determining a random access channel (RACH) opportunity corresponding to the second frequency domain position; determining, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency domain position; and performing random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0006] This method can be executed by a first communication apparatus. The first communication apparatus can be a terminal device, or a chip disposed in the terminal device for implementing the functions of the terminal device, or other components for implementing the functions of the terminal device.

[0007] Through this method, when frequency division multiplexing of synchronization broadcast blocks is applied, the network device can know the synchronization broadcast block selected by the terminal device.

[0008] In an optional embodiment, the method further includes: receiving a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; and determining the RACH opportunity corresponding to the second frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0009] In this way, even if the terminal device switches to a new frequency domain position for random access, it does not need to repeatedly receive SIB1, shortening the delay of the terminal device switching the frequency domain position, accelerating the random access speed of the terminal device, and reducing the energy consumption of the terminal device.

[0010] In an alternative embodiment, determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, and the indexes of the first synchronization broadcast block and the second synchronization broadcast block.

[0011] In an alternative embodiment, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering only the order in the frequency domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering only the order in the frequency domain; or, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering the order in both the frequency domain and the time domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering the order in both the frequency domain and the time domain.

[0012] In an alternative embodiment, the indexes of the first synchronization broadcast block and the second synchronization broadcast block are included in SIB1; or, the index of the first synchronization broadcast block is included in the first synchronization broadcast block, and the index of the second synchronization broadcast block is included in the second synchronization broadcast block.

[0013] In an alternative embodiment, the method further includes: receiving the system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where SIB1 includes the indication information of the RACH opportunity corresponding to the first frequency domain position; wherein, the indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: SIB1 and the second synchronization broadcast block; and determining the RACH opportunity corresponding to the second frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

[0014] In this way, even if the terminal device switches to a new frequency domain position for random access, it does not need to repeatedly receive SIB1, shortening the delay of the terminal device switching the frequency domain position, accelerating the random access speed of the terminal device, and reducing the energy consumption of the terminal device.

[0015] In an alternative embodiment, the transmission situation of the synchronization broadcast block of the second frequency domain position is included in SIB1.

[0016] In an alternative embodiment, the method further includes: receiving a System Information Block type 1 (SIB1) corresponding to a first Synchronization Signal Block (SSB), where the SIB1 includes indication information of a Random Access Channel (RACH) opportunity corresponding to a first frequency-domain position; determining the RACH opportunity corresponding to the first frequency-domain position according to the indication information of the RACH opportunity corresponding to the first frequency-domain position; determining, according to the transmission situation of the synchronization signal block located at the first frequency-domain position, the RACH opportunity to which the first synchronization signal block is mapped among the RACH opportunities corresponding to the first frequency-domain position; performing random access in the RACH opportunity to which the first synchronization signal block is mapped; receiving Radio Resource Control (RRC) signaling or a Physical Downlink Control Channel (PDCCH), where the RRC signaling or the PDCCH includes indication information of a RACH opportunity corresponding to a second frequency-domain position; where determining the RACH opportunity corresponding to the second frequency-domain position includes: determining the RACH opportunity corresponding to the second frequency-domain position according to the indication information of the RACH opportunity corresponding to the second frequency-domain position.

[0017] In this way, even when the terminal device switches to a new frequency-domain position for random access, it does not need to repeatedly receive the SIB1, shortening the delay of the terminal device switching the frequency-domain position, accelerating the random access speed of the terminal device, and reducing the power consumption of the terminal device. In addition, the impact on terminal devices that do not perform frequency-division multiplexing of synchronization signal blocks is reduced.

[0018] In an alternative embodiment, the transmission situation of the SSB at the second frequency-domain position and / or the index of the second synchronization signal block are included in the RRC signaling or the PDCCH.

[0019] In an alternative embodiment, the indication information of the Random Access Opportunity (RO) corresponding to the second frequency-domain position includes at least one of the following items: the indication information in the entire indication information of the RO corresponding to the second frequency-domain position except for the indication information that is the same as the indication information of the RO corresponding to the first frequency-domain position; the frequency-domain start position of the RO corresponding to the second frequency-domain position; the number of frequency-division multiplexing of the RO corresponding to the second frequency-domain position.

[0020] In an alternative embodiment, at least one of the following items is satisfied: the time-domain positions of the RO corresponding to the first frequency-domain position and the RO corresponding to the second frequency-domain position are the same; the RO corresponding to the first frequency-domain position and the RO corresponding to the second frequency-domain position do not overlap; the RO corresponding to the first frequency-domain position and the RO corresponding to the second frequency-domain position are closely arranged in the frequency domain and / or the time domain; compared with the indication information of the RO corresponding to the second frequency-domain position, for the indication information of the RO corresponding to the first frequency-domain position, the frequency-domain start position of the RO corresponding to the first frequency-domain position is different from the frequency-domain start position of the RO corresponding to the second frequency-domain position, and the remaining indication information is the same; the number of frequency-division multiplexing of the RO corresponding to the first frequency-domain position is the same as the number of frequency-division multiplexing of the RO corresponding to the SSB located at the second frequency-domain position.

[0021] In a second aspect, a second communication method is provided. The method includes: transmitting a first synchronization broadcast block located at a first frequency domain position; transmitting a second synchronization broadcast block located at a second frequency domain position; determining, according to the transmission situation of the synchronization broadcast block located at the first frequency domain position, the random access channel (RACH) opportunity to which the first synchronization broadcast block is mapped in the RACH opportunity corresponding to the first frequency domain position; and determining, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency domain position.

[0022] This method may be executed by a second communication device, which may be a network device, or a chip disposed in the network device for implementing the functions of the network device, or other components for implementing the functions of the network device.

[0023] In an optional implementation, the first synchronization broadcast block includes an index of the first synchronization broadcast block, and the second synchronization broadcast block includes an index of the second synchronization broadcast block; or, the method further includes: transmitting a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position, and the index of the first synchronization broadcast block and the index of the second synchronization broadcast block.

[0024] In an optional implementation, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering only the order in the frequency domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering only the order in the frequency domain; or, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering the order in both the frequency domain and the time domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering the order in both the frequency domain and the time domain.

[0025] In an optional implementation, the method further includes: transmitting a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; wherein, the indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: SIB1 and the second synchronization broadcast block.

[0026] In an optional implementation, the transmission situation of the synchronization broadcast block at the second frequency domain position is included in the SIB1.

[0027] In an alternative embodiment, the method further includes: sending System Information Block Type 1 (SIB1) corresponding to the first Synchronization Signal Block (SSB), where SIB1 includes indication information of a Random Access Channel (RACH) opportunity corresponding to a first frequency domain position; when the terminal device performs random access on the RACH opportunity to which the first SSB is mapped, sending Radio Resource Control (RRC) signaling or a Physical Downlink Control Channel (PDCCH) to the terminal device, where the RRC signaling or the PDCCH includes indication information of a RACH opportunity corresponding to a second frequency domain position.

[0028] In an alternative embodiment, the transmission situation of the SSB at the second frequency domain position and / or the index of the second Synchronization Signal Block are included in the RRC signaling or the PDCCH.

[0029] In an alternative embodiment, the indication information of the Random Access Occasion (RO) corresponding to the second frequency domain position includes at least one of the following items: indication information in all the indication information of the RO corresponding to the second frequency domain position except for the indication information identical to the indication information of the RO corresponding to the first frequency domain position; the frequency domain start position of the RO corresponding to the second frequency domain position; the frequency division multiplexing number of the RO corresponding to the second frequency domain position.

[0030] In an alternative embodiment, at least one of the following items is satisfied: the time domain positions of the RO corresponding to the first frequency domain position and the RO corresponding to the second frequency domain position are the same; the RO corresponding to the first frequency domain position and the RO corresponding to the second frequency domain position do not overlap; the RO corresponding to the first frequency domain position and the RO corresponding to the second frequency domain position are closely arranged in the frequency domain and / or the time domain; compared with the indication information of the RO corresponding to the second frequency domain position, for the indication information of the RO corresponding to the first frequency domain position, the frequency domain start position of the RO corresponding to the first frequency domain position is different from the frequency domain start position of the RO corresponding to the second frequency domain position, and the remaining indication information is the same; the frequency division multiplexing number of the RO corresponding to the first frequency domain position is the same as the frequency division multiplexing number of the RO corresponding to the SSB located at the second frequency domain position.

[0031] Regarding the technical effects of the second aspect or various embodiments, reference may be made to the introduction of the technical effects of the first aspect or the corresponding embodiments.

[0032] In a third aspect, a communication device is provided, which may be the first communication device as described above. The communication device is configured to perform the method in the first aspect or any possible implementation manner described above. The communication device may be a terminal device, or a chip or other component disposed in the terminal device. Specifically, the communication device may include modules for performing the method in the first aspect or any possible implementation manner, such as a processing module and a transceiver module. The transceiver module may also be implemented by a transceiver, and the processing module may also be implemented by a processor. If the communication device is a terminal device, the transceiver may be implemented by an antenna, a feeder, a codec, etc. in the terminal device. Alternatively, if the communication device is a chip disposed in the terminal device, the transceiver may be a communication interface in the chip, and the communication interface is connected to a radio frequency transceiver component in the terminal device to implement information transmission and reception through the radio frequency transceiver component.

[0033] In a fourth aspect, a communication device is provided, which may be the second communication device as described above. The communication device is configured to perform the method in the second aspect or any possible implementation manner described above. The communication device may be a network device, or a chip or other component disposed in the network device. Specifically, the communication device may include modules for performing the method in the second aspect or any possible implementation manner, such as a processing module and a transceiver module. The transceiver module may also be implemented by a transceiver, and the processing module may also be implemented by a processor. If the communication device is a network device, the transceiver may be implemented by an antenna, a feeder, a codec, etc. in the network device. Alternatively, if the communication device is a chip disposed in the network device, the transceiver may be a communication interface in the chip, and the communication interface is connected to a radio frequency transceiver component in the network device to implement information transmission and reception through the radio frequency transceiver component.

[0034] In a fifth aspect, a communication device is provided. The communication device may be the first communication device as described above. The communication device includes a processor. Optionally, the communication device may further include a memory for storing computer instructions. The processor and the memory are coupled to each other to implement the method described in the above first aspect or various possible embodiments. Alternatively, the communication device may not include a memory, and the memory may be located outside the communication device. Optionally, the communication device may further include a communication interface for communicating with other devices or apparatuses. The processor, the memory, and the communication interface are coupled to each other to implement the method described in the above first aspect or various possible embodiments. For example, when the processor executes the computer instructions stored in the memory, the communication device is caused to execute the method in the above first aspect or any one of the possible embodiments. The communication device may be a terminal device, or a chip or other component disposed in a terminal device. If the communication device is a terminal device, the transceiver may be implemented through an antenna, a feeder, a codec, etc. in the terminal device. Alternatively, if the communication device is a chip disposed in a terminal device, the transceiver may be a communication interface in the chip, and the communication interface is connected to a radio frequency transceiver component in the terminal device to implement information transmission and reception through the radio frequency transceiver component.

[0035] In a sixth aspect, a communication device is provided. The communication device may be the second communication device as described above. The communication device includes a processor. Optionally, the communication device may further include a memory for storing computer instructions. The processor and the memory are coupled to each other to implement the method described in the above second aspect or various possible embodiments. Alternatively, the communication device may not include a memory, and the memory may be located outside the communication device. Optionally, the communication device may further include a communication interface for communicating with other devices or apparatuses. The processor, the memory, and the communication interface are coupled to each other to implement the method described in the above second aspect or various possible embodiments. For example, when the processor executes the computer instructions stored in the memory, the communication device is caused to execute the method in the above second aspect or any one of the possible embodiments. The communication device may be a network device, or a chip or other component disposed in a network device. If the communication device is a network device, the transceiver may be implemented through an antenna, a feeder, a codec, etc. in the network device. Alternatively, if the communication device is a chip disposed in a network device, the transceiver may be a communication interface in the chip, and the communication interface is connected to a radio frequency transceiver component in the network device to implement information transmission and reception through the radio frequency transceiver component.

[0036] In a seventh aspect, a communication system is provided. The communication system includes the communication device described in the third aspect or the fifth aspect, and includes the communication device described in the fourth aspect or the sixth aspect.

[0037] In an eighth aspect, a computer-readable storage medium is provided, which is used to store computer instructions. When the computer instructions run on a computer, the computer is caused to execute the method described in the first aspect or any possible implementation manner thereof.

[0038] In a ninth aspect, a computer-readable storage medium is provided, which is used to store computer instructions. When the computer instructions run on a computer, the computer is caused to execute the method described in the second aspect or any possible implementation manner thereof.

[0039] In a tenth aspect, a computer program product containing instructions is provided, and the computer program product is used to store computer instructions. When the computer instructions run on a computer, the computer is caused to execute the method described in the first aspect or any possible implementation manner thereof.

[0040] In an eleventh aspect, a computer program product containing instructions is provided, and the computer program product is used to store computer instructions. When the computer instructions run on a computer, the computer is caused to execute the method described in the second aspect or any possible implementation manner thereof. Description of the Drawings

[0041] Figure 1A Schematic diagram of the time-frequency domain position of the synchronization broadcast block when synchronous broadcast block frequency division multiplexing is not applied;

[0042] Figure 1B Schematic diagram of the mapping relationship between the synchronization broadcast block and the random access channel opportunity when synchronous broadcast block frequency division multiplexing is not applied;

[0043] Figure 1C Another schematic diagram of the mapping relationship between the synchronization broadcast block and the random access channel opportunity when synchronous broadcast block frequency division multiplexing is not applied;

[0044] Figure 2A Schematic diagram of the time-frequency domain position of the synchronization broadcast block when synchronous broadcast block frequency division multiplexing is applied;

[0045] Figure 2B Another schematic diagram of the mapping relationship between the synchronization broadcast block and the random access channel opportunity when synchronous broadcast block frequency division multiplexing is applied;

[0046] Figure 2C Schematic diagram of the mapping relationship between the synchronization broadcast block and the random access channel opportunity when synchronous broadcast block frequency division multiplexing is applied;

[0047] Figure 2DAnother schematic diagram of the mapping relationship between the synchronization broadcast block and the random access channel opportunity when applying synchronous broadcast block frequency division multiplexing;

[0048] Figure 3 A schematic diagram of an application scenario of an embodiment of the present application;

[0049] Figure 4 A flowchart of a communication method provided by an embodiment of the present application;

[0050] Figure 5 A flowchart of another communication method provided by an embodiment of the present application;

[0051] Figure 6 A flowchart of yet another communication method provided by an embodiment of the present application;

[0052] Figure 7 A flowchart of still another communication method provided by an embodiment of the present application;

[0053] Figure 8 A schematic block diagram of a terminal device provided by an embodiment of the present application;

[0054] Figure 9 A schematic block diagram of a network device provided by an embodiment of the present application;

[0055] Figure 10 A schematic block diagram of a communication device provided by an embodiment of the present application;

[0056] Figure 11 Another schematic block diagram of a communication device provided by an embodiment of the present application;

[0057] Figure 12 Yet another schematic block diagram of a communication device provided by an embodiment of the present application;

[0058] Figure 13 Still another schematic block diagram of a communication device provided by an embodiment of the present application. Detailed implementation manners

[0059] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0060] Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

[0061] 1) A terminal device, including a device that provides voice and / or data connectivity to a user. Specifically, it includes a device that provides voice to the user, or a device that provides data connectivity to the user, or a device that provides both voice and data connectivity to the user. For example, it may include a handheld device with wireless connection capabilities, or a processing device connected to a wireless modem. The terminal device can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or interact with the RAN for both voice and data. The terminal device may include a user equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device (D2D) communication terminal device, a vehicle-to-everything (V2X) terminal device, a machine-to-machine / machine-type communications (M2M / MTC) terminal device, an Internet of Things (IoT) terminal device, a subscriber unit, a subscriber station, a mobile station, a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, or a user device, etc. For example, it may include a mobile phone (or a so-called "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-integrated mobile device, etc. For example, a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), etc. It also includes restricted devices, such as devices with lower power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners, etc.

[0062] By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. A wearable device, also known as a wearable intelligent device or a smart wearable device, etc., is a general term for devices developed by applying wearable technology to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, shoes, etc. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. A wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can achieve complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart helmets, smart jewelry, etc.

[0063] For the various terminal devices introduced above, if they are located on a vehicle (for example, placed inside or installed inside the vehicle), they can all be considered in-vehicle terminal devices. In-vehicle terminal devices are also known as on-board units (OBUs) for example.

[0064] In the embodiments of the present application, it can also be understood that those capable of data communication with a base station can be regarded as terminal devices.

[0065] 2) A network device, such as an access network (AN) device, such as a base station (e.g., an access point), may refer to a device in the access network that communicates with wireless terminal devices through one or more cells over the air interface. Or, for example, a network device in a V2X technology is a road side unit (RSU). The base station can be used to mutually convert the received air frames and IP packets and act as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. The network device can also coordinate the attribute management of the air interface. For example, the network device can include an evolved NodeB (NodeB or eNB or e-NodeB, evolutional NodeB) in a Long Term Evolution (LTE) system or an LTE-Advanced (LTE-A) system, or can also include a next generation NodeB (gNB) in a 5th generation (5G) New Radio (NR) system (also simply referred to as the NR system), or can also include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (cloud RAN) system.

[0066] 3) The synchronization broadcast block can be a synchronization signal and physical broadcast channel (SS / PBCH) block, and can also be referred to as a synchronization signal block (SSB). The SS / PBCH block is composed of a broadcast channel (BCH) and a synchronization signal, where the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0067] 4) The random access channel (RACH) occasion is the location for the terminal device to perform random access. Before performing random access, the terminal device first needs to perform cell search to obtain the synchronized broadcast block. Next, the terminal device needs to select a synchronized broadcast block and perform random access on the RACH occasion corresponding to the synchronized broadcast block, so that the network device can know the synchronized broadcast block selected by the terminal device. This correspondence between the synchronized broadcast block and the RACH occasion can be referred to as the synchronized broadcast block being mapped to the RACH occasion. The master information block (MIB) is broadcast on the BCH within the synchronized broadcast block. Therefore, obtaining the synchronized broadcast block enables obtaining the MIB corresponding to the synchronized broadcast block. The MIB is configured with parameters of the physical downlink control channel (PDCCH) for scheduling the system information block type 1 (SIB1). To determine the RACH occasion to which the synchronized broadcast block is mapped, the terminal device needs to detect the PDCCH scheduling SIB1 to obtain SIB1. SIB1 is configured with parameters of all possible RACH occasions to which the synchronized broadcast block may be mapped. The terminal device needs to determine the actual RACH occasion to which the synchronized broadcast block is mapped among these RACH occasions. One mapping principle is that the synchronized broadcast block needs to be mapped to consecutive valid RACH occasions.

[0068] 5) The terms "system" and "network" in the embodiments of this application can be used interchangeably. "At least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects, but can also represent a "and" relationship between the front and rear associated objects, subject to the description in this application or the understanding of those skilled in the art. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single (item) or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0069] Also, unless otherwise stated, the ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, time sequence, priority, or importance of multiple objects. For example, the first signaling and the second signaling are only used to distinguish different signaling, rather than indicating differences in the content, transmission order, priority, or importance of these two signaling.

[0070] The foregoing introduced some noun concepts involved in the embodiments of the present application. Next, the technical features involved in the embodiments of the present application will be introduced.

[0071] In the existing solution, the maximum number of synchronous broadcast blocks that can be sent within a 5-millisecond half-frame is a fixed value (for example, 4, 8, or 64). The resources of the optional RACH opportunities for these synchronous broadcast blocks are the same. The terminal device and the network device will determine the RACH opportunities to which these synchronous broadcast blocks are actually mapped according to the actual transmission situation of these synchronous broadcast blocks. For the sake of brevity below, the set of these synchronous broadcast blocks is referred to as a synchronous broadcast set, or in other words, these synchronous broadcast blocks belong to the same synchronous broadcast set. It should be understood that the synchronous broadcast set mentioned in the following description is not necessarily limited to a 5-millisecond half-frame. In the existing solution, the synchronous broadcast blocks in a synchronous broadcast set are all sent at one frequency domain position. For example, as Figure 1A shown, 4 synchronous broadcast blocks in a synchronous broadcast set are sent at the same frequency domain position and 4 different time domain positions, and these 4 synchronous broadcast blocks can be represented as synchronous broadcast block #0, synchronous broadcast block #1, synchronous broadcast block #2, and synchronous broadcast block #3 according to the time domain position.

[0072] As described above, there is a mapping relationship between the synchronous broadcast blocks and the RACH opportunities. In the existing solution, according to the time domain position and the actual transmission situation of the synchronous broadcast blocks in a synchronous broadcast set, these synchronous broadcast blocks are sequentially mapped to consecutive valid RACH opportunities. For example, assuming that a synchronous broadcast block is mapped to a RACH opportunity and the frequency division multiplexing number of the RACH opportunity is 4, when 4 synchronous broadcast blocks in a synchronous broadcast set are all sent, as Figure 1B shown, synchronous broadcast block #0 is mapped to RACH opportunity 1, synchronous broadcast block #1 is mapped to RACH opportunity 2, synchronous broadcast block #2 is mapped to RACH opportunity 3, and synchronous broadcast block #3 is mapped to RACH opportunity 4. It can be seen that the RACH opportunities to which the actually sent synchronous broadcast blocks are mapped are consecutive.

[0073] However, not all of the synchronization broadcast blocks in a synchronization broadcast set may be sent. If none of the synchronization broadcast blocks are mapped to a certain RACH opportunity, then this RACH opportunity will not be used for random access. For example, when synchronization broadcast block #0 is not sent, the first synchronization broadcast block sent in this synchronization broadcast set is synchronization broadcast block #1. At this time, as Figure 1C shown, synchronization broadcast block #1 is mapped to RACH opportunity 1, synchronization broadcast block #2 is mapped to RACH opportunity 2, synchronization broadcast block #3 is mapped to RACH opportunity 3, and RACH opportunity 4 is not utilized. It can be seen that even if there are unsent synchronization broadcast blocks, the RACH opportunities to which the actually sent synchronization broadcast blocks are mapped are still continuous.

[0074] If the synchronization broadcast blocks in a synchronization broadcast set can be sent at multiple frequency positions, the number of times the synchronization broadcast blocks are sent in the time domain can be reduced, thereby increasing the probability of the network device being turned off, which is beneficial to the energy saving of the network device. This method can be called frequency division multiplexing (FDM) of synchronization broadcast blocks. When frequency division multiplexing of synchronization broadcast blocks is applied, as Figure 2A shown, 4 synchronization broadcast blocks in a synchronization broadcast set are sent at two different frequency domain positions and two different time domain positions. These 4 synchronization broadcast blocks can be represented as synchronization broadcast block #0 at frequency domain position 1, synchronization broadcast block #0 at frequency domain position 2, synchronization broadcast block #1 at frequency domain position 1, and synchronization broadcast block #1 at frequency domain position 2 according to the frequency domain position and the time domain position.

[0075] However, when frequency division multiplexing of synchronization broadcast blocks is applied, if the existing mapping scheme is followed and the synchronization broadcast blocks are mapped to continuous valid RACH opportunities according to their time domain positions and actual sending situations, when all 4 synchronization broadcast blocks in a synchronization broadcast set are sent, since the time domain positions of synchronization broadcast block #0 at frequency domain position 1 and synchronization broadcast block #0 at frequency domain position 2 are the same, and the time domain positions of synchronization broadcast block #1 at frequency domain position 1 and synchronization broadcast block #1 at frequency domain position 2 are the same, therefore, as Figure 2B shown, synchronization broadcast block #0 at frequency domain position 1 and synchronization broadcast block #0 at frequency domain position 2 are both mapped to RACH opportunity 1, synchronization broadcast block #1 at frequency domain position 1 and synchronization broadcast block #1 at frequency domain position 2 are both mapped to RACH opportunity 2, and RACH opportunities 3 and 4 are not utilized. If the terminal device performs random access at RACH opportunity 1, the network device cannot distinguish whether the synchronization broadcast block selected by the terminal device is synchronization broadcast block #0 at frequency domain position 1 or synchronization broadcast block #0 at frequency domain position 2.

[0076] To solve this problem, the SIB1 corresponding to the synchronization broadcast blocks located at different frequency domain positions may indicate different RACH opportunities (hereinafter, the RACH opportunity indicated by the SIB1 corresponding to the synchronization broadcast block located at a certain frequency domain position is referred to as the RACH opportunity corresponding to this frequency domain position). In this way, the synchronization broadcast blocks located at different frequency domain positions can be independently mapped, that is, the synchronization broadcast block located at a certain frequency domain position is only mapped to the RACH opportunity corresponding to this frequency domain position. For example, when the 4 synchronization broadcast blocks in a synchronization broadcast set are all sent, as Figure 2C shown, the synchronization broadcast block #0 and the synchronization broadcast block #1 located at frequency domain position 1 are respectively mapped to the RACH opportunity 1 and the RACH opportunity 2 corresponding to frequency domain position 1, and the synchronization broadcast block #0 and the synchronization broadcast block #1 located at frequency domain position 2 are respectively mapped to the RACH opportunity 1 and the RACH opportunity 2 corresponding to frequency domain position 2. Another example is that when the synchronization broadcast block #0 located at frequency domain position 1 is not sent, as Figure 2D shown, the synchronization broadcast block #0 and the synchronization broadcast block #1 located at frequency domain position 2 are respectively mapped to the RACH opportunity 1 and the RACH opportunity 2 corresponding to frequency domain position 2. As the first synchronization broadcast block sent on frequency domain position 1, the synchronization broadcast block #1 located at frequency domain position 1 is mapped to the RACH opportunity 1 corresponding to frequency domain position 1, and the RACH opportunity 2 corresponding to frequency domain position 1 is not utilized. It can be seen that regardless of whether there are unsent synchronization broadcast blocks, for a single frequency domain position, the RACH opportunities to which the actually sent synchronization broadcast blocks are mapped are continuous. Through this mapping method, the network device can identify the synchronization broadcast block selected by the terminal device.

[0077] In addition, before the terminal device performs random access, it is necessary to determine whether there is a synchronization broadcast block whose synchronization signal reference signal received power (SS-RSRP) is higher than the specified threshold. If there is such a synchronization broadcast block, select this synchronization broadcast block and perform random access on the RACH opportunity to which this synchronization broadcast block is mapped. If there is no such synchronization broadcast block, select any synchronization broadcast block and perform random access on the RACH opportunity to which this synchronization broadcast block is mapped.

[0078] In some cases, after the terminal device selects a synchronization broadcast block and obtains the SIB1 corresponding to the synchronization broadcast block, it may reselect another synchronization broadcast block belonging to the same synchronization broadcast set for random access. For example, a terminal device in fast movement may not have performed random access yet, and the SS-RSRP of the currently selected synchronization broadcast block may have changed, so it needs to select a synchronization broadcast block again. Another example is that the terminal device may select another synchronization broadcast block for random access after a random access failure. As described above, SIB1 is used to indicate the RACH opportunities to which the synchronization broadcast block may be mapped.

[0079] When the synchronization broadcast blocks in a synchronization broadcast set are all sent at one frequency domain position, if the terminal device reselects a synchronization broadcast block, since the resources of the RACH opportunities available for the newly selected synchronization broadcast block are the same as those of the previously selected synchronization broadcast block. Therefore, the terminal device can use the previously obtained SIB1 to determine the RACH opportunity to which the newly selected synchronization broadcast block is mapped among the RACH opportunities to which the synchronization broadcast block indicated by this SIB1 may be mapped. That is, the terminal device does not need to obtain again the RACH opportunities to which the synchronization broadcast block may be mapped.

[0080] However, when synchronous broadcast block frequency division multiplexing is applied, if the terminal device reselects a synchronization broadcast block and the newly selected synchronization broadcast block is located at a different frequency domain position from the previously selected synchronization broadcast block, the RACH opportunities to which these two synchronization broadcast blocks may be mapped are different. At this time, the terminal device needs to decode the newly selected synchronization broadcast block to obtain the information of the PDCCH scheduling the SIB1 corresponding to this synchronization broadcast block, and obtain a new SIB1 by detecting the PDCCH, so as to obtain from this new SIB1 the RACH opportunities to which the newly selected synchronization broadcast block may be mapped. Such a method will result in a longer delay for the terminal device to switch the frequency domain position, affect the random access speed of the terminal device, and increase the power consumption of the terminal device.

[0081] In view of this, the technical solutions of the embodiments of the present application are provided. The technical solutions provided by the embodiments of the present application can be applied to the 4th generation (4G) mobile communication technology systems, such as the LTE system, or can be applied to 5G systems, such as the NR system, or can also be applied to next-generation mobile communication systems or other similar communication systems, and specific applications are not limited.

[0082] The following introduces a network architecture to which the embodiments of the present application are applied. Please refer to Figure 3 .

[0083] Figure 3 It includes a network device and a terminal device, and the terminal device is connected to a network device. Of course Figure 3The number of terminal devices in [description] is only an example. In actual applications, a network device can provide services for multiple terminal devices. Figure 3 For the network device in [description], and each terminal device among some or all of the multiple terminal devices can implement the technical solutions provided by the embodiments of the present application. Additionally, Figure 3 Taking the mobile phone as an example for the terminal device in [description], it is not limited to this in actual applications.

[0084] Figure 3 The network device in [description] is, for example, an access network device, such as a base station, or it can also be a device such as an RSU. Among them, the base station corresponds to different devices in different systems. For example, in a 4G system, it can correspond to an eNB, and in a 5G system, it can correspond to a gNB. Of course, the technical solutions provided by the embodiments of the present application can also be applied to future mobile communication systems. Therefore, Figure 3 The network device in [description] can also correspond to the access network device in a future mobile communication system.

[0085] The following introduces the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.

[0086] The embodiments of the present application provide a communication method. Figure 4 The figure is a flowchart of this method. In the following introduction process, this method is applied to the Figure 3 network architecture shown as an example.

[0087] In S401, the terminal device receives a first synchronization broadcast block located at a first frequency domain position from the network device.

[0088] In S402, the terminal device receives a second synchronization broadcast block located at a second frequency domain position from the network device.

[0089] It should be understood that although S401 is before S402 in [[description]], the timing of these steps is not limited to this. S401 can be performed after S402, or can be performed simultaneously with S402. Figure 4 The frequency domain position can also be referred to as a frequency point and can be represented by the channel number marking the synchronization broadcast block, such as the Global Synchronization Channel Number (GSCN).

[0090] The first synchronization broadcast block and the second synchronization broadcast block can belong to the same synchronization broadcast set. In this synchronization broadcast set, in addition to the first synchronization broadcast block and the second synchronization broadcast block, it can also include other synchronization broadcast blocks located at the first frequency domain position and / or other synchronization broadcast blocks located at the second frequency domain position. In addition, in this synchronization broadcast set, it can also include synchronization broadcast blocks located at other frequency domain positions.

[0091] ​

[0092] Taking Figure 2A as an example, the first frequency domain position may be frequency domain position 1, and the second frequency domain position may be frequency domain position 2. The first synchronization broadcast block may be synchronization broadcast block #1 located at frequency domain position 1, and the second synchronization broadcast block may be synchronization broadcast block #1 located at frequency domain position 2.

[0093] In S403, the terminal device determines the RACH opportunity corresponding to the second frequency domain position. In this embodiment, there are different ways to determine the RACH opportunity corresponding to the second frequency domain position, which will be specifically introduced later.

[0094] As described above, the mapping between the synchronization broadcast blocks at different frequency domain positions and the RACH opportunities is independent of each other. That is, there are respectively a RACH opportunity corresponding to the first frequency domain position and a RACH opportunity corresponding to the second frequency domain position. The synchronization broadcast block located at the first frequency domain position will only be mapped to the RACH opportunity corresponding to the first frequency domain position, and the synchronization broadcast block located at the second frequency domain position will only be mapped to the RACH opportunity corresponding to the second frequency domain position. Taking Figure 2C as an example, the RACH opportunities corresponding to frequency domain position 1 are RACH opportunity 1 and RACH opportunity 2 below, and the RACH opportunities corresponding to frequency domain position 2 are RACH opportunity 1 and RACH opportunity 2 above.

[0095] In S404, the terminal device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0096] In S405, the network device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0097] Regarding how to determine the RACH opportunity to which the synchronization broadcast block is mapped according to the transmission situation of the synchronization broadcast block, reference can be made to the corresponding description in the above text, which will not be elaborated here. It should be understood that the mapping relationship between the synchronization broadcast block and the RACH opportunity is not necessarily one-to-one. One synchronization broadcast block can be mapped to multiple RACH opportunities, and multiple synchronization broadcast blocks can also be mapped to one RACH opportunity.

[0098] The synchronization broadcast block located at the second frequency domain position may refer to all the synchronization broadcast blocks in the synchronization broadcast set located at the second frequency domain position. The transmission situation of the synchronization broadcast block refers to whether the synchronization broadcast block is actually transmitted. From Figure 2C and Figure 2D it can be seen that when the transmission situations of the synchronization broadcast blocks in the same synchronization broadcast set are different, the mapping relationships between the transmitted synchronization broadcast blocks and the RACH opportunities are different.

[0099] The transmission status of the synchronization broadcast block located at the second frequency domain position can be included in SIB1 corresponding to the first synchronization broadcast block. In addition, SIB1 corresponding to the first synchronization broadcast block can also include the transmission status of the synchronization broadcast blocks located at other frequency domain positions. For example, SIB1 corresponding to the first synchronization broadcast block can include the transmission status of all the synchronization broadcast blocks in this synchronization broadcast set, or SIB1 corresponding to the first synchronization broadcast block can include the transmission status of the synchronization broadcast blocks located at other frequency domain positions except the first frequency domain position. To reduce the impact on the terminal device that does not perform frequency division multiplexing of synchronization broadcast blocks, the transmission status of the synchronization broadcast block at the second frequency domain position can be included in the reserved bits of SIB1 corresponding to the first synchronization broadcast block. Alternatively, SIB1 can be divided into a first part and a second part. The terminal device that does not perform frequency division multiplexing of synchronization broadcast blocks only decodes the first part, and the terminal device that performs frequency division multiplexing of synchronization broadcast blocks decodes the first part and the second part. The transmission status of the synchronization broadcast block at the second frequency domain position can be included in the second part (i.e., the part that is only decoded by the terminal device that performs frequency division multiplexing of synchronization broadcast blocks).

[0100] In S406, the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0101] It should be understood that although S405 is before S406 in Figure 4 , the timing of these steps is not limited to this. S405 can be performed after S406, or can be performed simultaneously with S406. For example, the network device can first determine the mapping relationship between the synchronization broadcast blocks it actually sends and the RACH opportunities. When the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped, it infers the synchronization broadcast block selected by the terminal device according to the mapping relationship of the RACH opportunity to which the second synchronization broadcast block is mapped in these mapping relationships. Alternatively, the network device can also determine which frequency domain position the RACH opportunity to which the second synchronization broadcast block is mapped belongs to when the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped, then determine the mapping relationship between the synchronization broadcast blocks actually sent at this frequency domain position and the RACH opportunities, and then infer the synchronization broadcast block selected by the terminal device according to the mapping relationship of the RACH opportunity to which the second synchronization broadcast block is mapped in these mapping relationships.

[0102] In this way, the network device can learn the synchronization broadcast block selected by the terminal device.

[0103] As described above, at S404, the terminal device determines the RACH opportunity corresponding to the second frequency domain position. The following will specifically introduce the method that enables the terminal device to determine the RACH opportunity corresponding to the second frequency domain position.

[0104] Method 1

[0105] According to the existing solution, the SIB1 corresponding to each synchronization broadcast block includes the indication information of the RACH opportunity corresponding to the frequency domain position where the synchronization broadcast block is located. This solution can be followed to enable the terminal device to infer the RACH opportunity corresponding to other frequency domain positions based on the indication information of the RACH opportunity corresponding to this frequency domain position. Figure 5 It is the flowchart of this method.

[0106] At S501, the terminal device receives the first synchronization broadcast block located at the first frequency domain position from the network device.

[0107] At S502, the terminal device receives the second synchronization broadcast block located at the second frequency domain position from the network device.

[0108] For the specific descriptions of S501 and S502, the corresponding descriptions in S401 and S402 can be referred to respectively, which will not be elaborated here.

[0109] At S503, the terminal device receives the SIB1 corresponding to the first synchronization broadcast block from the network device. The SIB1 corresponding to the first synchronization broadcast block includes the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0110] The indication information of the RACH opportunity may include frequency domain information and / or time domain information. For example, the indication information of the RACH opportunity may include the frequency domain starting position, the frequency division multiplexing number, and the time domain position. The frequency domain starting position may be the frequency domain position of the RACH opportunity with the lowest frequency domain position among these RACH opportunities. The frequency division multiplexing number is the number of RACH opportunities multiplexed in the frequency domain. Taking Figure 2C as an example, in the indication information of the RACH opportunity corresponding to the frequency domain position 1, the frequency domain starting position is the frequency domain position of the RACH opportunity 1 corresponding to the frequency domain position 1, and the frequency division multiplexing number is 2.

[0111] At S504, the terminal device determines the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0112] Regarding how to infer the RACH opportunity corresponding to the second frequency domain position based on the indication information of the RACH opportunity corresponding to the first frequency domain position, there are the following solutions in this embodiment. These solutions can be used in combination. For example, different solutions can be applied to the frequency domain position and time domain position of the RACH opportunity respectively, and different solutions can also be applied to the frequency domain start position and frequency division multiplexing number of the RACH opportunity respectively. In addition, the examples in each solution can also be used in combination.

[0113] Solution 1: The terminal device can determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position and in combination with a predefined rule. The predefined rule can refer to the association relationship between the frequency domain and / or time domain positions of the RACH opportunities corresponding to different frequency domain positions, or the association relationship between the indication information of the RACH opportunities corresponding to different frequency domain positions.

[0114] For example, it can be pre-agreed that the time domain positions of the RACH opportunities corresponding to different frequency domain positions are the same. Based on this, the terminal device can infer that the time domain position of the RACH opportunity corresponding to the first frequency domain position can be the same as the time domain position of the RACH opportunity corresponding to the second frequency domain position. When there are multiple RACH opportunities corresponding to one frequency domain position, it can be that the RACH opportunities corresponding to different frequency domain positions have the same overall time domain position, or the time domain position of each RACH opportunity is the same.

[0115] For another example, it can be pre-agreed that among the indication information of the RACH opportunities corresponding to different frequency domain positions, other information (such as the frequency division multiplexing number and time domain position) except for the start position in the frequency domain is the same. Based on this, the terminal device can infer that compared with the indication information of the RACH opportunity corresponding to the second frequency domain position, the indication information of the RACH opportunity corresponding to the first frequency domain position has the same other information except for the start position in the frequency domain.

[0116] For yet another example, it can be pre-agreed that the frequency division multiplexing numbers of the RACH opportunities corresponding to different frequency domain positions are the same. Based on this, the terminal device can infer that the frequency division multiplexing number of the RACH opportunity corresponding to the first frequency domain position is the same as the frequency division multiplexing number of the RACH opportunity corresponding to the second frequency domain position.

[0117] Solution 2: The terminal device can determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, the index of the first synchronization broadcast block, and the index of the second synchronization broadcast block, and in combination with a predefined rule. For the specific description of the predefined rule, reference can be made to the corresponding description in Solution 1 above, which will not be elaborated here.

[0118] The index of the first synchronization broadcast block can be the index that only considers the order in the frequency domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block can be the index that only considers the order in the frequency domain of the second synchronization broadcast block. Such an index can be simply referred to as a frequency domain index. Taking Figure 2C as an example, the frequency domain indices of synchronization broadcast block #0 and synchronization broadcast block #1 located at frequency domain position 1 can be 0, and the frequency domain indices of synchronization broadcast block #0 and synchronization broadcast block #1 located at frequency domain position 2 can be 1. Alternatively, the index of the first synchronization broadcast block can be the index that considers the order in both the frequency domain and the time domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block can be the index that considers the order in both the frequency domain and the time domain of the second synchronization broadcast block. Such an index can be simply referred to as an absolute index. Taking Figure 2C as an example, the absolute index of synchronization broadcast block #0 located at frequency domain position 1 can be 0, the absolute index of synchronization broadcast block #1 located at frequency domain position 1 can be 1, the absolute index of synchronization broadcast block #0 located at frequency domain position 2 can be 2, and the absolute index of synchronization broadcast block #1 located at frequency domain position 2 can be 3. In addition, any information that can reflect the sorting of a certain frequency domain position among all the frequency domain positions involved in a synchronization broadcast block can be used to replace the index of the synchronization broadcast block.

[0119] For example, it can be pre-agreed that the time-domain positions and the number of frequency-division multiplexing of RACH opportunities corresponding to different frequency-domain positions are the same, and the RACH opportunities corresponding to adjacent frequency-domain positions are closely arranged in the frequency domain. It should be understood that adjacent frequency-domain positions are not necessarily continuous in the frequency domain. As long as there is no other frequency-domain position for transmitting synchronization broadcast blocks between two frequency-domain positions, they can be regarded as adjacent. The RACH opportunities closely arranged in the frequency domain are not necessarily continuous in the frequency domain either. Having a fixed interval such as a subcarrier interval can be regarded as closely arranged. In this case, if the time-domain position of the RACH opportunity corresponding to the first frequency-domain position is known, the time-domain position of the RACH opportunity corresponding to the second frequency-domain position can be directly determined. As for the frequency-domain position, if the frequency-domain index of the first frequency-domain position is 0 and the frequency-domain index of the second frequency-domain position is 1, the RACH opportunity corresponding to the first frequency-domain position and the RACH opportunity corresponding to the second frequency-domain position are closely arranged. When the frequency-domain start position and the number of frequency-division multiplexing of the RACH opportunity corresponding to the first frequency-domain position are known, the frequency-domain start position of the RACH opportunity corresponding to the second frequency-domain position can be inferred therefrom, and the number of frequency-division multiplexing of the second frequency-domain position can be directly determined according to the number of frequency-division multiplexing of the first frequency-domain position. Or, if the frequency-domain index of the first frequency-domain position is 1 and the frequency-domain index of the second frequency-domain position is 3, the interval in the frequency domain between the RACH opportunity corresponding to the first frequency-domain position and the RACH opportunity corresponding to the second frequency-domain position can also be inferred according to the frequency-domain start position and the number of frequency-division multiplexing of the RACH opportunity corresponding to the first frequency-domain position, so as to determine the frequency-domain start position of the RACH opportunity corresponding to the second frequency-domain position.

[0120] When determining the RACH opportunity corresponding to the second frequency-domain position, the terminal device can consider the subcarrier interval of the RACH and / or the subcarrier interval of the physical uplink shared channel (PUSCH). For example, the difference between the frequency-domain and / or time-domain positions of the RACH opportunities corresponding to different frequency points can be an expression related to the subcarrier interval of the RACH and / or the subcarrier interval of the PUSCH.

[0121] The index of the first synchronization broadcast block and the index of the second synchronization broadcast block can be included in the synchronization broadcast block and / or SIB1. When the index of the first synchronization broadcast block and the index of the second synchronization broadcast block are included in the synchronization broadcast block, they can be included in the payload and / or reserved bits of the synchronization broadcast block. When the index of the first synchronization broadcast block and the index of the second synchronization broadcast block are included in SIB1, they can be included in the reserved bits of SIB1 and / or the part decoded only by the terminal device that performs frequency-division multiplexing of the synchronization broadcast block.

[0122] For example, the index of the first synchronization broadcast block and the index of the second synchronization broadcast block may be included in the payloads of the first synchronization broadcast block and the second synchronization broadcast block, respectively. Alternatively, the index of the first synchronization broadcast block is included in the payload of the first synchronization broadcast block, and the index of the second synchronization broadcast block is included in SIB1 corresponding to the first synchronization broadcast block. Of course, the index of the second synchronization broadcast block is included in the payload of the second synchronization broadcast block, and the index of the first synchronization broadcast block is included in SIB1 corresponding to the second synchronization broadcast block. However, in the embodiments of the present application, the terminal device can perform random access without obtaining SIB1 corresponding to the second synchronization broadcast block. Or, the index of the first synchronization broadcast block and the index of the second synchronization broadcast block may both be included in SIB1 corresponding to the first synchronization broadcast block. In addition, SIB1 corresponding to the first synchronization broadcast block may further include the indexes of other synchronization broadcast blocks. For example, SIB1 corresponding to the first synchronization broadcast block may include the indexes of all synchronization broadcast blocks in this synchronization broadcast set, or SIB1 corresponding to the first synchronization broadcast block may include the indexes of other synchronization broadcast blocks except the first synchronization broadcast block.

[0123] Here, the terminal device may first determine the RACH opportunity corresponding to the first frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, and then determine the RACH opportunity corresponding to the second frequency domain position according to the RACH opportunity corresponding to the first frequency domain position. It is also possible to directly determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position. The present application does not limit this.

[0124] In S505, the terminal device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0125] In S506, the network device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0126] In S507, the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0127] For the specific descriptions of S505, S506, and S507, reference may be made to the corresponding descriptions in S404, S405, and S406 respectively, which will not be elaborated here. In addition, although in Figure 5S506 is located after S503, but the timing of these steps is not limited to this. S506 can be performed before S503 or simultaneously with S503. For example, the network device can first determine the mapping relationship between the actually transmitted synchronization broadcast block and the RACH opportunity. When the terminal device performs random access on the RACH opportunity mapped to the second synchronization broadcast block, the synchronization broadcast block selected by the terminal device can be inferred based on the mapping relationship of the RACH opportunity mapped to the second synchronization broadcast block in these mapping relationships. Or, when the terminal device performs random access on the RACH opportunity mapped to the second synchronization broadcast block, the network device can determine which RACH opportunity corresponding to the frequency domain position the RACH opportunity mapped to the second synchronization broadcast block belongs to, then determine the mapping relationship between the actually transmitted synchronization broadcast block and the RACH opportunity at this frequency domain position, and then infer the synchronization broadcast block selected by the terminal device based on the mapping relationship of the RACH opportunity mapped to the second synchronization broadcast block in these mapping relationships.

[0128] In this way, the terminal device can infer the RACH opportunities corresponding to other frequency domain positions based on the RACH opportunities corresponding to a certain frequency domain position. Therefore, even if the terminal device switches to a new frequency domain position for random access, it does not need to repeatedly receive SIB1, shortening the delay of the terminal device switching the frequency domain position, accelerating the random access speed of the terminal device, and reducing the energy consumption of the terminal device.

[0129] Method 2

[0130] The content included in SIB1 in the existing solution can be extended so that the SIB1 corresponding to each synchronization broadcast block includes not only the indication information of the RACH opportunity corresponding to the frequency domain position where the synchronization broadcast block is located, but also all or part of the indication information of the RACH opportunities corresponding to other frequency domain positions. Or, the content included in the synchronization broadcast block in the existing solution can be extended so that each synchronization broadcast block includes all or part of the indication information of the RACH opportunity corresponding to the frequency domain position where the synchronization broadcast block is located. In the case of only including partial indication information, the terminal device can obtain the remaining indication information through predefined means or the like. Figure 6 It is a flowchart of this method.

[0131] In S601, the terminal device receives the first synchronization broadcast block located at the first frequency domain position from the network device.

[0132] In S602, the terminal device receives the second synchronization broadcast block located at the second frequency domain position from the network device.

[0133] For the specific descriptions of S601 and S602, reference can be made to the corresponding descriptions in S401 and S402 respectively, which will not be elaborated here.

[0134] In S603, the terminal device receives SIB1 corresponding to the first synchronization broadcast block from the network device. The SIB1 corresponding to the first synchronization broadcast block includes indication information of the RACH opportunity corresponding to the first frequency domain position. In addition, the SIB1 corresponding to the first synchronization broadcast block may further include indication information of the RACH opportunity corresponding to the second frequency domain position, which is described in detail in Solution 1 below. Alternatively, the indication information of the RACH opportunity corresponding to the second frequency domain position may also be included in the second SSB, which is described in detail in Solution 2 below. These solutions can be used in combination. For example, different solutions can be applied to the frequency domain position and time domain position of the RACH opportunity respectively, and different solutions can also be applied to the frequency domain start position and frequency division multiplexing number of the RACH opportunity respectively. In addition, the examples in each solution can also be used in combination.

[0135] For the specific description of the indication information of the RACH opportunity, reference can be made to the corresponding description in S503, which will not be elaborated here.

[0136] Solution 1: The indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the SIB1 corresponding to the first synchronization broadcast block. Of course, the indication information of the RACH opportunity corresponding to the second frequency domain position will also be included in the SIB1 corresponding to the second synchronization broadcast block. However, in the embodiments of this application, the terminal device can perform random access without obtaining the SIB1 corresponding to the second synchronization broadcast block. In addition to the indication information of the RACH opportunity corresponding to the second frequency domain position, the SIB1 corresponding to the first synchronization broadcast block may further include indication information of the RACH opportunity corresponding to other frequency domain positions. For example, the SIB1 corresponding to the first synchronization broadcast block may include indication information of the RACH opportunity corresponding to all frequency domain positions, or the SIB1 corresponding to the first synchronization broadcast block may include indication information of the RACH opportunity corresponding to other frequency domain positions except the first frequency domain position. The terminal device can determine which part of the indication information of the RACH opportunity in the SIB1 is the indication information of the RACH opportunity corresponding to the second frequency domain position where the second synchronization broadcast block is located according to the index of the second synchronization broadcast block.

[0137] The indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the reserved bits of SIB1 and / or in the part that can only be decoded by the terminal device performing only synchronous broadcast block frequency division multiplexing. For example, the indication information of the RACH opportunity corresponding to the first frequency domain position may be included in the regular bits of SIB1, and the indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the reserved bits of SIB1. Another example is that the indication information of the RACH opportunity corresponding to the first frequency domain position may be included in the first part of SIB1 (i.e., the part that can be decoded by both the terminal device not performing synchronous broadcast block frequency division multiplexing and the terminal device performing frequency division multiplexing), and the indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the second part of SIB1 (i.e., the part that can only be decoded by the terminal device performing synchronous broadcast block frequency division multiplexing).

[0138] Solution 2: The indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the second synchronous broadcast block. Correspondingly, the indication information of the RACH opportunity corresponding to the first frequency domain position may also be included in the first synchronous broadcast block. In this embodiment, the terminal device may or may not need to obtain the indication information of the RACH opportunity corresponding to the first frequency domain position from the first synchronous broadcast block. From the perspective of the entire system, the indication information of the RACH opportunity corresponding to the first frequency domain position in the first synchronous broadcast block can be used by other terminal devices that have reselected the first synchronous broadcast block.

[0139] The indication information of the RACH opportunity corresponding to the second frequency domain position may be included in the payload and / or reserved bits of the second synchronous broadcast block. Correspondingly, the indication information of the RACH opportunity corresponding to the first frequency domain position may also be included in the payload and / or reserved bits of the first synchronous broadcast block.

[0140] Regardless of which solution, the indication information of the RACH opportunity corresponding to the second frequency-domain position can only be partial indication information of the RACH opportunity corresponding to the second frequency-domain position, and the remaining indication information can be indicated by other means, such as in combination with Method 1. By way of example and not limitation, the terminal device can determine the remaining indication information according to the indication information of the RACH opportunity at the first frequency-domain position through a predefined rule. For example, it can be pre-agreed that the partial indication information of the RACH opportunities corresponding to different frequency-domain positions is the same. At this time, the SIB1 corresponding to the first synchronization broadcast block can include the indication information of the RACH opportunity corresponding to the first frequency-domain position, and the part of the indication information of the RACH opportunity corresponding to the second frequency-domain position that is different from the indication information of the RACH opportunity corresponding to the first frequency-domain position. Of course, the part of the indication information of the RACH opportunity corresponding to the first frequency-domain position that is the same as the indication information of the RACH opportunity corresponding to the second frequency-domain position is also substantially the indication information of the RACH opportunity corresponding to the second frequency-domain position. The above description is only to illustrate that there is no need to repeatedly include this part of the information that is common to the RACH opportunities corresponding to different frequency-domain positions in the SIB.

[0141] For example, it can be pre-agreed that the frequency-division multiplexing number and time-domain position of the RACH opportunity corresponding to the first frequency-domain position are the same as those of the RACH opportunity corresponding to the second frequency-domain position. Then, the indication information of the RACH opportunity corresponding to the first frequency-domain position can include the frequency-domain start position, frequency-division multiplexing number, and time-domain position of the RACH opportunity corresponding to the first frequency-domain position, and the indication information of the RACH opportunity corresponding to the second frequency-domain position can include the frequency-domain start position corresponding to the second frequency-domain position. If combined with the example in Method 1, the first part of SIB1 can include the frequency-domain start position, frequency-division multiplexing number, and time-domain position of the RACH opportunity corresponding to the first frequency-domain position, and the second part of SIB1 can include the frequency-division multiplexing number and frequency-domain start position corresponding to the second frequency-domain position.

[0142] Another example is that it can be pre-agreed that the time-domain positions of the RACH opportunities corresponding to the first frequency-domain position and the second frequency-domain position are the same. Then, the indication information of the RACH opportunity corresponding to the first frequency-domain position can include the frequency-domain start position, frequency-division multiplexing number, and time-domain position of the RACH opportunity corresponding to the first frequency-domain position, and the indication information of the RACH opportunity corresponding to the second frequency-domain position can include the frequency-division multiplexing number and frequency-domain start position corresponding to the second frequency-domain position. If combined with the example in Method 2, the first part of SIB1 can include the frequency-domain start position, frequency-division multiplexing number, and time-domain position of the RACH opportunity corresponding to the first frequency-domain position, and the second synchronization broadcast block can include the frequency-division multiplexing number and frequency-domain start position corresponding to the second frequency-domain position.

[0143] At S604, the terminal device determines the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

[0144] At S605, the terminal device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0145] At S606, the network device determines the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0146] At S607, the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0147] For the specific descriptions of S605, S606, and S607, reference can be made to the corresponding descriptions in S404, S405, and S406 respectively, as well as the corresponding descriptions in S505, S506, and S507, which will not be elaborated here.

[0148] In this way, the terminal device can determine the RACH opportunity corresponding to another frequency domain position according to the information in SIB1 corresponding to the synchronization broadcast block located at a certain frequency domain position. Or, the terminal device can determine the RACH opportunity corresponding to another frequency domain position according to the information in SIB1 corresponding to the synchronization broadcast block located at a certain frequency domain position, in combination with the information in the synchronization broadcast block located at another frequency domain position and / or predefined information. Therefore, even if the terminal device switches to a new frequency domain position for random access, it does not need to repeatedly receive SIB1, shortening the delay of the terminal device switching the frequency domain position, accelerating the random access speed of the terminal device, and reducing the power consumption of the terminal device.

[0149] Method 3

[0150] The design of SIB1 and the synchronization broadcast block in the existing solution can be adopted. After the terminal device completes random access, the network device sends the indication information of the RACH opportunity corresponding to another frequency domain position to the terminal device through radio resource control (RRC) signaling or PDCCH. Figure 7 This is the flowchart of this method.

[0151] At S701, the terminal device receives the first synchronization broadcast block located at the first frequency domain position from the network device.

[0152] At S702, the terminal device receives the second synchronization broadcast block located at the second frequency domain position from the network device.

[0153] For the specific descriptions of S701 and S702, reference can be made to the corresponding descriptions in S401 and S402 respectively, which will not be elaborated here.

[0154] In S703, the terminal device receives the SIB1 corresponding to the first synchronization broadcast block from the network device, and the SIB1 corresponding to the first synchronization broadcast block includes the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0155] For the specific description of S703, reference can be made to the corresponding description in S503, which will not be elaborated here.

[0156] In S704, the terminal device determines the RACH opportunity corresponding to the first frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0157] In S705, the terminal device determines the RACH opportunity to which the first synchronization broadcast block is mapped among the RACH opportunities corresponding to the first frequency domain position according to the transmission situation of the synchronization broadcast block located at the first frequency domain position.

[0158] In S706, the network device determines the RACH opportunity to which the first synchronization broadcast block is mapped among the RACH opportunities corresponding to the first frequency domain position according to the transmission situation of the synchronization broadcast block located at the first frequency domain position.

[0159] In S707, the terminal device performs random access on the RACH opportunity to which the first synchronization broadcast block is mapped.

[0160] For the specific descriptions of S705, S706 and S707, reference can be made to the corresponding descriptions in S404, S405 and S406 respectively, which will not be elaborated here.

[0161] In S708, the terminal device receives RRC signaling or PDCCH from the network device, and the RRC signaling or PDCCH includes the indication information of the RACH opportunity corresponding to the second frequency domain position. In addition, the RRC signaling or PDCCH may also include the indication information of the RACH opportunities corresponding to other frequency domain positions. For example, the RRC signaling or PDCCH may include the indication information of the RACH opportunities corresponding to all frequency domain positions, or the RRC signaling or PDCCH may include the indication information of the RACH opportunities corresponding to other frequency domain positions except the first frequency domain position. The terminal device can determine which part of the indication information of the RACH opportunity in the SIB1 is the indication information of the RACH opportunity corresponding to the second frequency domain position where the second synchronization broadcast block is located according to the index of the second synchronization broadcast block.

[0162] Here, similar to Method 2, the RRC signaling or PDCCH may only include partial indication information of the RACH opportunity corresponding to the second frequency-domain position, and the remaining indication information may be indicated by other means, such as in combination with Method 1 and / or Method 2. By way of example and not limitation, the terminal device may determine the remaining indication information according to the indication information of the RACH opportunity at the first frequency-domain position through a predefined rule. For example, it may be pre-agreed that the partial indication information of the RACH opportunity corresponding to different frequency-domain positions is the same. At this time, the RRC signaling or PDCCH may include the part of the indication information of the RACH opportunity corresponding to the second frequency-domain position that is different from the indication information of the RACH opportunity corresponding to the first frequency-domain position.

[0163] The RRC signaling or PDCCH may further include the transmission status of the synchronization broadcast block located at the second frequency-domain position and / or the index of the second synchronization broadcast block. In addition, the RRC signaling or PDCCH may also include the transmission status of the synchronization broadcast blocks corresponding to other frequency-domain positions and / or the indices of other synchronization broadcast blocks. For example, the RRC signaling or PDCCH may include the transmission status and / or indices of all the synchronization broadcast blocks in this synchronization broadcast set, or the RRC signaling or PDCCH may include the transmission status of the synchronization broadcast blocks located at other frequency-domain positions except the first frequency-domain position and / or the indices of other synchronization broadcast blocks except the first synchronization broadcast block.

[0164] For the specific descriptions of the transmission status of the synchronization broadcast block and the index of the synchronization broadcast block, reference may be made to the corresponding descriptions in S404 and S504 respectively, which will not be elaborated here.

[0165] After the terminal device successfully accesses the cell through S707, it may need to perform random access again. For example, the terminal device may need to return from the RRC inactive state to the RRC connected state. At this time, if the terminal device selects the second synchronization broadcast block located at the second frequency-domain position, it may determine the RACH opportunity to which the second synchronization broadcast block is mapped based on the information received in S708.

[0166] Specifically, in S709, the terminal device determines the RACH opportunity corresponding to the second frequency-domain position according to the indication information of the RACH opportunity corresponding to the second frequency-domain position.

[0167] In S710, the terminal device determines the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency-domain position according to the transmission status of the synchronization broadcast block located at the second frequency-domain position.

[0168] In S711, the network device determines the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0169] In S712, the terminal device performs random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0170] For the specific descriptions of S710, S711, and S712, reference can be made to the corresponding descriptions in S404, S405, and S406, as well as the corresponding descriptions in S505, S506, and S507 respectively, which will not be elaborated here. It should be understood that although S706 and S711 are two steps in Figure 7 and S706 is before S707, and S711 is after S708 and before S712, S706 and S711 can be one step, and the timing of these steps is not limited to this. S706 can be performed after S707 or simultaneously with S707. S711 can be performed before S708 or even S707, can be performed after S711, or can be performed simultaneously with these steps.

[0171] In this way, the terminal device can obtain the RACH opportunities corresponding to other frequency domain positions through RRC signaling or PDCCH after random access. Therefore, if the terminal device needs to perform random access again for some reason after accessing the cell, even if the synchronization broadcast block selected by the terminal device at this time is the synchronization broadcast block at other frequency domain positions, there is no need to repeatedly receive the SIB, which shortens the delay of the terminal device switching the frequency domain position, speeds up the random access speed of the terminal device, and reduces the power consumption of the terminal device.

[0172] In addition, terminal devices that do not perform frequency division multiplexing of synchronization broadcast blocks (including terminal devices that do not support frequency division multiplexing of synchronization broadcast blocks and terminal devices that support frequency division multiplexing of synchronization broadcast blocks but do not perform it) will default that the synchronization broadcast blocks in a synchronization broadcast set are all sent at one frequency domain position. Such terminal devices can only select the synchronization broadcast block located at one frequency domain position during random access and cannot select the synchronization broadcast block located at other frequency domain positions. This method does not require modifying the design of SIB1 and synchronization broadcast blocks in the existing solution, reducing the impact on terminal devices that do not perform frequency division multiplexing of synchronization broadcast blocks.

[0173] In the embodiments of the present application, the degree of association (e.g., similarity) between RACH opportunities corresponding to different frequency domain positions may affect the latency of the terminal to switch the frequency domain position and / or the power consumption of the terminal device. For example, if the degree of association between RACH opportunities corresponding to different frequency domain positions is relatively high, then in Method 1, the terminal device may spend less time and / or less power consumption to determine the RACH opportunity of the second frequency domain position. Or, if the degree of association between RACH opportunities corresponding to different frequency domain positions is relatively high, then in Method 2, the indication information of the RACH opportunities corresponding to other frequency domain positions included in SIB1 may be less. Or, if the degree of association between RACH opportunities corresponding to different frequency domain positions is relatively high, then in Method 3, the indication information of the RACH opportunities corresponding to other frequency domain positions included in RRC signaling or PDCCH may be less. Therefore, the RACH opportunity and the indication information of the RACH opportunity can be designed according to this idea.

[0174] Regarding the RACH opportunity, the following solutions can be considered. These solutions can be used in combination.

[0175] Solution 1: The time domain positions of the RACH opportunities corresponding to different frequency domain positions can be the same. That is, the time domain position of the RACH opportunity corresponding to the first frequency domain position can be the same as the time domain position of the RACH opportunity corresponding to the second frequency domain position. For the specific description of the same time domain position of the RACH opportunity, reference can be made to the corresponding description in S504, which will not be elaborated here.

[0176] Solution 2: The RACH opportunities corresponding to different frequency domain positions can be non-overlapping. That is, the RACH opportunity corresponding to the first frequency domain position can be non-overlapping with the RACH opportunity corresponding to the second frequency domain position. The non-overlap here is not limited to non-overlap in the time domain or non-overlap in the frequency domain, as long as it is non-overlapping in the combined time-frequency domain. Of course, if the time domain positions of the RACH opportunities corresponding to different frequency domain positions are set to be the same, and the RACH opportunities corresponding to different frequency domain positions are set to be non-overlapping, the non-overlap here is equivalent to non-overlap in the frequency domain.

[0177] Solution 3: The RACH opportunities corresponding to adjacent frequency domain positions can be closely arranged in the frequency domain and / or the time domain. That is, the RACH opportunity corresponding to the first frequency domain position can be closely arranged with the RACH opportunity corresponding to the second frequency domain position in the frequency domain and / or the time domain. Of course, if the time domain positions of the RACH opportunities corresponding to different frequency domain positions are set to be the same, the RACH opportunities corresponding to different frequency domain positions can only be closely arranged in the frequency domain. For the specific description of adjacent and closely arranged, reference can be made to the corresponding description in S504, which will not be elaborated here.

[0178] Take Figure 2CFor example, the following RACH opportunities 1 and 2 are the RACH opportunities corresponding to frequency domain position 1, and the upper RACH opportunities 1 and 2 are the RACH opportunities corresponding to frequency domain position 2. It can be seen that the time domain positions of these 4 RACH opportunities are the same, and these RACH opportunities do not overlap with each other and are closely arranged in the frequency domain.

[0179] Regarding the indication information of the RACH opportunity, the following solutions can be considered. These solutions can be used in combination.

[0180] Solution 1: In the indication information of the RACH opportunities corresponding to different frequency domain positions, the starting positions of the frequency domain are different, and other information (for example, the frequency division multiplexing number and the time domain information) can be the same. That is, compared with the indication information of the RACH opportunity corresponding to the second frequency domain position, for the indication information of the RACH opportunity corresponding to the first frequency domain position, the starting position of the frequency domain corresponding to the RACH opportunity of the first frequency domain position is different from the starting position of the frequency domain corresponding to the RACH opportunity of the second frequency domain position, and other information can be the same.

[0181] Solution 2: The time domain positions of the RACH opportunities corresponding to different frequency domain positions can be the same. That is, the time domain position of the RACH opportunity corresponding to the first frequency domain position can be the same as the time domain position of the RACH opportunity corresponding to the second frequency domain position.

[0182] Solution 3: The frequency division multiplexing numbers of the RACH opportunities corresponding to different frequency domain positions can be the same. That is, the frequency division multiplexing number of the RACH opportunity corresponding to the first frequency domain position can be the same as the frequency division multiplexing number of the RACH opportunity corresponding to the second frequency domain position.

[0183] The following describes the apparatus for implementing the above method in the embodiments of the present application with reference to the accompanying drawings. Therefore, the content in the above can be used in the subsequent embodiments, and the repeated content will not be described again.

[0184] Figure 8Schematic block diagram of a terminal device 800 provided by an embodiment of the present application. The terminal device 800 includes a processing module 810 and a transceiver module 820. Exemplarily, the terminal device 800 may be a terminal device, or a chip applied to a terminal device, or other combined devices, components, etc. having the functions of the above terminal device. When the terminal device 800 is a terminal device, the transceiver module 820 may be a transceiver, and the transceiver may include an antenna, a radio frequency circuit, etc. The processing module 810 may be a processor, and the processor may include one or more central processing units (CPUs). When the terminal device 800 is a component having the functions of the above terminal device, the transceiver module 820 may be a radio frequency unit, and the processing module 810 may be a processor, such as a baseband processor. When the terminal device 800 is a chip system, the transceiver module 820 may be an input / output interface of the chip (such as a baseband chip), and the processing module 810 may be a processor of the chip system, which may include one or more central processing units. It should be understood that the processing module 810 in the embodiment of the present application may be implemented by a processor or processor-related circuit components, and the transceiver module 820 may be implemented by a transceiver or transceiver-related circuit components.

[0185] The processing module 810 may be used to perform all operations other than the transceiver operations performed by the terminal device in the above method embodiments, and / or to support other processes of the technologies described herein. The transceiver module 820 may be used to perform all receiving operations performed by the terminal device in the above method embodiments, and / or to support other processes of the technologies described herein.

[0186] The transceiver module 820 may be a functional module that can complete both sending and receiving operations. For example, the transceiver module 820 may be used to perform all sending and receiving operations performed by the terminal device in the above method embodiments. For example, when performing a sending operation, the transceiver module 820 may be regarded as a sending module, and when performing a receiving operation, the transceiver module 820 may be regarded as a receiving module; or, the transceiver module 820 may also be two functional modules, and the transceiver module may be regarded as a collective term for these two functional modules. These two functional modules are a sending module and a receiving module respectively. The sending module is used to complete the sending operation. For example, the sending module may be used to perform all sending operations performed by the terminal device in the above method embodiments. The receiving module is used to complete the receiving operation. For example, the receiving module may be used to perform all receiving operations performed by the terminal device in the above method embodiments.

[0187] The transceiver module 820 is used to receive a first synchronization broadcast block located at a first frequency domain position.

[0188] The transceiver module 820 is further used to receive a second synchronization broadcast block located at a second frequency domain position.

[0189] The processing module 810 is used to determine the random access channel (RACH) opportunity corresponding to the second frequency domain position.

[0190] The processing module 810 is further used to determine, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position.

[0191] The transceiver module 820 is further used to perform random access on the RACH opportunity to which the second synchronization broadcast block is mapped.

[0192] As an alternative implementation manner, the transceiver module 820 is further used to receive the system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, and the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; wherein, the processing module 810 is specifically used to determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position.

[0193] As an alternative implementation manner, the processing module 810 is specifically used to determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, as well as the index of the first synchronization broadcast block and the index of the second synchronization broadcast block.

[0194] As an alternative implementation manner, the index of the first synchronization broadcast block is the index considering only the order in the frequency domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering only the order in the frequency domain of the second synchronization broadcast block; or, the index of the first synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the second synchronization broadcast block.

[0195] As an alternative implementation manner, the index of the first synchronization broadcast block and the index of the second synchronization broadcast block are included in the SIB1; or, the index of the first synchronization broadcast block is included in the first synchronization broadcast block, and the index of the second synchronization broadcast block is included in the second synchronization broadcast block.

[0196] As an alternative implementation manner, the transceiver module 820 is further used to receive the system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, and the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; wherein, the indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: the SIB1 and the second synchronization broadcast block; wherein, the processing module 810 is specifically used to determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

[0197] As an alternative implementation, the transceiver module 820 is further configured to receive the System Information Block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; the processing module 810 is further configured to determine the RACH opportunity corresponding to the first frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position; the processing module 810 is further configured to determine the RACH opportunity to which the first synchronization broadcast block is mapped from the RACH opportunities corresponding to the first frequency domain position according to the transmission situation of the synchronization broadcast block located at the first frequency domain position; the transceiver module 820 is further configured to perform random access in the RACH opportunity to which the first synchronization broadcast block is mapped; the transceiver module 820 is further configured to receive Radio Resource Control (RRC) signaling or Physical Downlink Control Channel (PDCCH), where the RRC signaling or the PDCCH includes indication information of the RACH opportunity corresponding to the second frequency domain position; wherein, the processing module 810 is specifically configured to determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

[0198] Figure 9 FIG. is a schematic block diagram of a network device 900 provided in an embodiment of the present application. The network device 900 includes a processing module 910 and a transceiver module 920. Exemplarily, the network device 900 may be a network device, or a chip applied to a network device, or other combined devices, components, etc. having the functions of the above network device. When the network device 900 is a network device, the transceiver module 920 may be a transceiver, and the transceiver may include an antenna and a radio frequency circuit, etc., and the processing module 910 may be a processor, and the processor may include one or more central processing units (CPUs). When the network device 900 is a component having the functions of the above network device, the transceiver module 920 may be a radio frequency unit, and the processing module 910 may be a processor, such as a baseband processor. When the network device 900 is a chip system, the transceiver module 920 may be an input / output interface of the chip (such as a baseband chip), and the processing module 910 may be a processor of the chip system, and may include one or more central processing units. It should be understood that the processing module 910 in the embodiment of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 920 may be implemented by a transceiver or a transceiver-related circuit component.

[0199] The processing module 910 may be configured to perform all operations other than the transceiver operations performed by the network device in the above method embodiments, and / or to support other processes of the technologies described herein. The transceiver module 920 may be configured to perform all receiving operations performed by the network device in the above method embodiments, and / or to support other processes of the technologies described herein.

[0200] The transceiver module 920 can be a functional module that can perform both transmission and reception operations. For example, the transceiver module 920 can be used to execute all the transmission and reception operations performed by the network device in the above method embodiments. For example, when performing a transmission operation, the transceiver module 920 can be regarded as a transmission module, and when performing a reception operation, the transceiver module 920 can be regarded as a reception module. Alternatively, the transceiver module 920 can also be two functional modules, and the transceiver module can be regarded as the collective name of these two functional modules. These two functional modules are a transmission module and a reception module respectively. The transmission module is used to complete the transmission operation. For example, the transmission module can be used for all the transmission operations performed by the network device in the above method embodiments. The reception module is used to complete the reception operation. For example, the reception module can be used to execute all the reception operations performed by the network device in the above method embodiments.

[0201] The transceiver module 920 is used to transmit a first synchronization broadcast block located at a first frequency domain position.

[0202] The transceiver module 920 is further used to transmit a second synchronization broadcast block located at a second frequency domain position.

[0203] The processing module 910 is used to determine the random access channel (RACH) opportunity to which the first synchronization broadcast block is mapped in the RACH opportunity corresponding to the first frequency domain position according to the transmission situation of the synchronization broadcast block located at the first frequency domain position.

[0204] The processing module 910 is further used to determine the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency domain position according to the transmission situation of the synchronization broadcast block located at the second frequency domain position.

[0205] As an optional implementation manner, the first synchronization broadcast block includes the index of the first synchronization broadcast block, and the second synchronization broadcast block includes the index of the second synchronization broadcast block; or, the transceiver module 920 is further used to transmit a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block. The SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position, as well as the indexes of the first synchronization broadcast block and the second synchronization broadcast block.

[0206] As an optional implementation manner, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering only the order in the frequency domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering only the order in the frequency domain; or, the index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering the order in both the frequency domain and the time domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering the order in both the frequency domain and the time domain.

[0207] As an alternative embodiment, the transceiver module 920 is further configured to send a System Information Block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of a RACH opportunity corresponding to a first frequency domain position; wherein, the indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: SIB1 and the second synchronization broadcast block.

[0208] As an alternative embodiment, the transceiver module 920 is further configured to send a System Information Block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of a RACH opportunity corresponding to a first frequency domain position; the transceiver module 920 is further configured to, when the terminal device performs random access on the RACH opportunity to which the first synchronization broadcast block is mapped, send Radio Resource Control (RRC) signaling or a Physical Downlink Control Channel (PDCCH) to the terminal device, where the RRC signaling or the PDCCH includes indication information of a RACH opportunity corresponding to a second frequency domain position.

[0209] An embodiment of this application further provides a communication device, which may be a terminal device or a circuit. The communication device may be configured to perform the actions performed by the terminal device in the foregoing method embodiment.

[0210] When the communication device is a terminal device, Figure 10 a schematic structural diagram of a simplified terminal device is shown. For ease of understanding and illustration, Figure 10 in which, the terminal device takes a mobile phone as an example. As Figure 10 shown, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input / output device. The processor is mainly configured to process communication protocols and communication data, control the terminal device, execute software programs, process data of software programs, etc. The memory is mainly configured to store software programs and data. The radio frequency circuit is mainly configured to convert baseband signals and radio frequency signals and process radio frequency signals. The antenna is mainly configured to receive and send radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display screen, a keyboard, etc., is mainly configured to receive data input by a user and output data to the user. It should be noted that some types of terminal devices may not have an input / output device.

[0211] When data needs to be sent, after the processor performs baseband processing on the data to be sent, it outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Figure 10Only one memory and one processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor. The embodiments of the present application do not limit this.

[0212] In the embodiments of the present application, an antenna and a radio frequency circuit with transceiver functions may be regarded as the transceiver unit of the terminal device (the transceiver unit may be a functional unit that can implement both the sending function and the receiving function; or, the transceiver unit may also include two functional units, namely a receiving unit that can implement the receiving function and a sending unit that can implement the sending function), and a processor with processing functions may be regarded as the processing unit of the terminal device. As Figure 10 shown, the terminal device includes a transceiver unit 1010 and a processing unit 1020. The transceiver unit may also be referred to as a transceiver, a transceiver machine, a transceiver device, etc. The processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, the devices in the transceiver unit 1010 for implementing the receiving function may be regarded as the receiving unit, and the devices in the transceiver unit 1010 for implementing the sending function may be regarded as the sending unit, that is, the transceiver unit 1010 includes a receiving unit and a sending unit. The transceiver unit may sometimes also be referred to as a transceiver machine, a transceiver, or a transceiver circuit, etc. The receiving unit may sometimes also be referred to as a receiver, a receiver machine, or a receiving circuit, etc. The sending unit may sometimes also be referred to as a transmitter, a transmitter machine, or a transmitting circuit, etc.

[0213] It should be understood that the transceiver unit 1010 is used to perform the sending operation and the receiving operation on the terminal device side in the above method embodiments, and the processing unit 1020 is used to perform other operations on the terminal device except for the transceiver operation in the above method embodiments.

[0214] When the communication device is a chip - type device or circuit, the device may include a transceiver unit and a processing unit. Among them, the transceiver unit may be an input - output circuit and / or a communication interface; the processing unit is an integrated processor, a micro - processor, or an integrated circuit.

[0215] When the communication device in this embodiment is a terminal device, reference may be made to the Figure 11 shown device. Although Figure 11 channel encoders and channel decoders are shown, it can be understood that these modules do not constitute a restrictive description of this embodiment and are only illustrative.

[0216] Figure 12Another form of this embodiment is shown. The processing device 1200 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem. The communication device in this embodiment can serve as the modulation subsystem among them. Specifically, the modulation subsystem may include a processor 1203 and an interface 1204. As another variant, the modulation subsystem includes a memory 1206, a processor 1203, and a program stored on the memory 1206 and executable on the processor. When the processor 1203 executes the program, it implements the method on the terminal device side in the above method embodiment. It should be noted that the memory 1206 can be non-volatile or volatile, and its location can be inside the modulation subsystem or in the processing device 1200, as long as the memory 1206 can be connected to the processor 1203.

[0217] When the device in the embodiment of the present application is a network device, the device can be as Figure 13 shown. The device 1300 includes one or more radio frequency units, such as a remote radio unit (RRU) 1310 and one or more baseband units (BBU) (which can also be referred to as a digital unit, DU) 1320. The RRU 1310 can be referred to as a transceiver module. The transceiver module can include a transmitting module and a receiving module, or the transceiver module can be a module capable of implementing both the transmitting function and the receiving function. Optionally, the transceiver module can also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., and it can include at least one antenna 1311 and a radio frequency unit 1312. The RRU 1310 is mainly used for the transceiver of radio frequency signals and the conversion between radio frequency signals and baseband signals, for example, for sending indication information to the terminal device. The BBU 1310 is mainly used for baseband processing and controlling the base station, etc. The RRU 1310 and the BBU 1320 can be physically set together or physically separated, that is, a distributed base station.

[0218] The BBU 1320 is the control center of the base station and can also be referred to as a processing module, mainly used to complete baseband processing functions such as channel coding, multiplexing, modulation, spreading, etc. For example, the BBU 1320 can be used to control the base station to execute the operation process of the network device in the above method embodiment, for example, to generate the above indication information, etc.

[0219] In one example, the BBU 1320 may be composed of one or more single boards. The multiple single boards may jointly support a radio access network of a single access mode (such as an LTE network), or may separately support radio access networks of different access modes (such as an LTE network, a 5G network, or other networks). The BBU 1320 further includes a memory 1321 and a processor 1322. The memory 1321 is used to store necessary instructions and data. The processor 1322 is used to control the base station to perform necessary operations, for example, to control the base station to execute the operation procedures regarding the network device in the above method embodiments. The memory 1321 and the processor 1322 may serve one or more single boards. That is to say, a memory and a processor may be separately provided on each single board. It is also possible that multiple single boards share the same memory and processor. In addition, necessary circuits may be provided on each single board.

[0220] An embodiment of the present application provides a communication system. The communication system may include the network device involved in the above method embodiment, and include the terminal device involved in the above method embodiment. The terminal device is, for example, Figure 8 the terminal device 800 in Figure 9 the network device 900 in

[0221] An embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the terminal device in the above method embodiments.

[0222] An embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the network device in the above method embodiments.

[0223] An embodiment of the present application further provides a computer program product. The computer program product is used to store a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the terminal device in the above method embodiments.

[0224] An embodiment of the present application further provides a computer program product. The computer program product is used to store a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the network device in the above method embodiments.

[0225] It should be understood that the processor mentioned in the embodiments of the present application may be a CPU, or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0226] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0227] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor.

[0228] It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0229] It should be understood that in various embodiments of the present application, the sequence numbers of the above processes do not indicate the order of execution, and the order of execution 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.

[0230] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0231] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here.

[0232] In several embodiments provided by the present 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 illustrative. For example, the above division of units is only a logical function division, and there can be other division methods in actual implementation. For example, 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be electrical, mechanical, or other forms.

[0233] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0234] In addition, the functional units in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0235] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of this application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0236] As described above, the above is only the specific implementation manner of this application, but the protection scope of the embodiments of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the embodiments of this application can easily think of changes or substitutions, which should all be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that, including: receiving a first synchronization broadcast block located at a first frequency domain position; receiving a second synchronization broadcast block located at a second frequency domain position; determining a random access channel (RACH) opportunity corresponding to the second frequency domain position; determining, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position; performing random access on the RACH opportunity to which the second synchronization broadcast block is mapped; receiving a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; wherein, determining the RACH opportunity corresponding to the second frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position; or, the indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: the SIB1 and the second synchronization broadcast block; wherein, determining the RACH opportunity corresponding to the second frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position; or, determining the RACH opportunity corresponding to the first frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position; determining, according to the transmission situation of the synchronization broadcast block located at the first frequency domain position, the RACH opportunity to which the first synchronization broadcast block is mapped among the RACH opportunities corresponding to the first frequency domain position; performing random access on the RACH opportunity to which the first synchronization broadcast block is mapped; receiving radio resource control (RRC) signaling or a physical downlink control channel (PDCCH), where the RRC signaling or the PDCCH includes the indication information of the RACH opportunity corresponding to the second frequency domain position; wherein, determining the RACH opportunity corresponding to the second frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

2. The method according to claim 1, characterized in that, Determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position includes: determining the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, the index of the first synchronization broadcast block, and the index of the second synchronization broadcast block.

3. The method according to claim 2, characterized in that, The index of the first synchronization broadcast block is the index considering only the order in the frequency domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering only the order in the frequency domain of the second synchronization broadcast block; or, The index of the first synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the second synchronization broadcast block.

4. The method according to any one of claims 1 to 3, characterized in that, The index of the first synchronization broadcast block and the index of the second synchronization broadcast block are included in the SIB1; or, The index of the first synchronization broadcast block is included in the first synchronization broadcast block, and the index of the second synchronization broadcast block is included in the second synchronization broadcast block.

5. A communication method, characterized in that, Comprising: Transmitting a first synchronization broadcast block located at a first frequency domain position; Transmitting a second synchronization broadcast block located at a second frequency domain position; Determining, according to the transmission situation of the synchronization broadcast block located at the first frequency domain position, the RACH opportunity to which the first synchronization broadcast block is mapped in the RACH opportunity corresponding to the first frequency domain position; Determining, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped in the RACH opportunity corresponding to the second frequency domain position; Transmitting a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position, wherein The indication information of the RACH opportunity corresponding to the first frequency domain position is used to determine the RACH opportunity corresponding to the second frequency domain position; Or, The indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: the SIB1 and the second synchronization broadcast block; Or, When the terminal device performs random access on the RACH opportunity to which the first synchronization broadcast block is mapped, sending radio resource control (RRC) signaling or a physical downlink control channel (PDCCH) to the terminal device, where the RRC signaling or the PDCCH includes indication information of the RACH opportunity corresponding to the second frequency domain position.

6. The method according to claim 5, wherein, The first synchronization broadcast block includes the index of the first synchronization broadcast block, and the second synchronization broadcast block includes the index of the second synchronization broadcast block; Or, The method further includes: Transmitting a system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position, and the index of the first synchronization broadcast block and the index of the second synchronization broadcast block.

7. The method according to claim 6, wherein, The index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering only the order in the frequency domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering only the order in the frequency domain; or, The index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering the order in both the frequency domain and the time domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering the order in both the frequency domain and the time domain.

8. A communication device, wherein, Comprising: A transceiver module, configured to receive a first synchronization broadcast block located at a first frequency domain position; The transceiver module is further configured to: receive a second synchronization broadcast block located at a second frequency domain position; A processing module, configured to determine a random access channel (RACH) opportunity corresponding to the second frequency domain position; The processing module is further configured to: determine, according to the transmission situation of the synchronization broadcast block located at the second frequency domain position, the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency domain position; The transceiver module is further configured to: perform random access on the RACH opportunity to which the second synchronization broadcast block is mapped; The transceiver module is further configured to: receive the system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency domain position; The processing module is further configured to: determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position; The indication information of the RACH opportunity corresponding to the second frequency domain position is included in at least one of the following items: the SIB1 and the second synchronization broadcast block; the processing module is further configured to: determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position; The processing module is further configured to: determine the RACH opportunity corresponding to the first frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position; determine, according to the transmission situation of the synchronization broadcast block located at the first frequency domain position, the RACH opportunity to which the first synchronization broadcast block is mapped among the RACH opportunities corresponding to the first frequency domain position; The transceiver module is further configured to: perform random access on the RACH opportunity to which the first synchronization broadcast block is mapped; receive radio resource control (RRC) signaling or a physical downlink control channel (PDCCH), where the RRC signaling or the PDCCH includes indication information of the RACH opportunity corresponding to the second frequency domain position; The processing module is further configured to: determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the second frequency domain position.

9. The device according to claim 8, wherein, The processing module is specifically configured to: determine the RACH opportunity corresponding to the second frequency domain position according to the indication information of the RACH opportunity corresponding to the first frequency domain position, and the indexes of the first synchronization broadcast block and the second synchronization broadcast block.

10. The device according to claim 9, wherein, The index of the first synchronization broadcast block is the index considering only the order in the frequency domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering only the order in the frequency domain of the second synchronization broadcast block; or, The index of the first synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the first synchronization broadcast block, and the index of the second synchronization broadcast block is the index considering the order in both the frequency domain and the time domain of the second synchronization broadcast block.

11. The device according to any one of claims 8 to 10, wherein, The indexes of the first synchronization broadcast block and the second synchronization broadcast block are included in the SIB1; or, The index of the first synchronization broadcast block is included in the first synchronization broadcast block, and the index of the second synchronization broadcast block is included in the second synchronization broadcast block.

12. A communication device, wherein, Including: A transceiver module, configured to send a first synchronization broadcast block located at a first frequency domain position; The transceiver module is further configured to: transmit a second synchronization broadcast block located at a second frequency-domain position; The processing module is configured to determine, according to the transmission situation of the synchronization broadcast block located at the first frequency-domain position, the random access channel (RACH) opportunity to which the first synchronization broadcast block is mapped among the RACH opportunities corresponding to the first frequency-domain position; The processing module is further configured to: determine, according to the transmission situation of the synchronization broadcast block located at the second frequency-domain position, the RACH opportunity to which the second synchronization broadcast block is mapped among the RACH opportunities corresponding to the second frequency-domain position; The transceiver module is further configured to: transmit system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes indication information of the RACH opportunity corresponding to the first frequency-domain position; the indication information of the RACH opportunity corresponding to the first frequency-domain position is used to determine the RACH opportunity corresponding to the second frequency-domain position; The indication information of the RACH opportunity corresponding to the second frequency-domain position is included in at least one of the following items: the SIB1 and the second synchronization broadcast block; The transceiver module is further configured to: when the terminal device performs random access on the RACH opportunity to which the first synchronization broadcast block is mapped, send radio resource control (RRC) signaling or a physical downlink control channel (PDCCH) to the terminal device, where the RRC signaling or the PDCCH includes the indication information of the RACH opportunity corresponding to the second frequency-domain position.

13. The device according to claim 12, wherein, The first synchronization broadcast block includes an index of the first synchronization broadcast block, and the second synchronization broadcast block includes an index of the second synchronization broadcast block; or, The transceiver module is further configured to: transmit system information block type 1 (SIB1) corresponding to the first synchronization broadcast block, where the SIB1 includes the indication information of the RACH opportunity corresponding to the first frequency-domain position, and the indexes of the first synchronization broadcast block and the second synchronization broadcast block.

14. The device according to claim 13, characterized in that, The index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering only the order in the frequency domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering only the order in the frequency domain; or, The index of the first synchronization broadcast block is the index of the first synchronization broadcast block considering the order in both the frequency domain and the time domain, and the index of the second synchronization broadcast block is the index of the second synchronization broadcast block considering the order in both the frequency domain and the time domain.

15. A computer program product, characterized in that, The computer program product includes: computer program code, which, when run on a computer, causes the computer to execute the method according to any one of claims 1 to 7.

16. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions, which, when run, cause a communication device to execute the method according to any one of claims 1 to 7.

17. A communication device, characterized in that, The apparatus includes a processor and a storage medium, and the storage medium stores instructions, which, when run by the processor, cause the apparatus to execute the method according to any one of claims 1 to 7.

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