Communication method and communication apparatus

Abstract

The present application provides a communication method and a communication apparatus. The method may comprise: a terminal device receives first information, the first information indicating that a configuration of a synchronization signal / physical broadcast channel (SS / PBCH) block is changed from a first configuration to a second configuration; and the terminal device determines a valid random access channel (RACH) occasion (RO) on the basis of the second configuration. The present technical solution provides an update mechanism for determining the valid RO, thereby achieving reliable transmission of a PRACH.

Description

Communication method and communication apparatus

[0001] This application claims priority to the Chinese Patent Application No. 202411086451.1, filed on August 8, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communications, and more particularly, to a communication method and a communication apparatus. BACKGROUND

[0003] A terminal device can establish an initial connection with a network by sending a random access channel (RACH). For example, the terminal device can determine a time-frequency resource of a random access channel occasion (RO) and send a RACH using the time-frequency resource. The time-frequency resource of the RO is usually related to a synchronization signal / physical broadcast channel (SS / PBCH) block.

[0004] Currently, in some communication scenarios (such as energy saving scenarios), the network supports flexible and variable SS / PBCH block transmission modes. However, the current RO related determination mechanism may not be applicable to this communication scenario. Therefore, there is an urgent need for an RO related determination mechanism that can be applied to this communication scenario to improve the transmission reliability of the RACH. SUMMARY

[0005] The present application provides a communication method and a communication apparatus, which provides an RO determination mechanism that can be applied to flexible and variable SS / PBCH blocks to improve communication reliability.

[0006] In a first aspect, a communication method is provided. The method can be applied to the terminal side, that is, the method can be executed by a terminal device, or can be executed by a component (such as a chip or a chip system or a circuit or a communication module) of the terminal device, and the present application does not limit this. Hereinafter, the terminal device will be mainly taken as an example for description.

[0007] The method can include: receiving first information, the first information indicating that a configuration of a synchronization signal / physical broadcast channel (SS / PBCH) block is changed from a first configuration to a second configuration; and determining a valid random access channel occasion (RO) based on the second configuration.

[0008] Based on the above technical solution, in the case that the configuration of the SS / PBCH block changes from the first configuration to the second configuration, the terminal device determines the valid RO based on the second configuration instead of still using the valid RO determined based on the first configuration. The technical solution proposes an updating mechanism for timely determining the valid RO, and can realize reliable transmission of the RACH.

[0009] In combination with the first aspect, in some implementations of the first aspect, the configuration of the SS / PBCH block includes one or more of the following: a period of a synchronization signal block (SSB) burst set corresponding to the SS / PBCH block, a beam set associated with the SSB burst set corresponding to the SS / PBCH block, or a transmission state of the SSB burst set.

[0010] Based on the above technical solution, the configuration of the SS / PBCH block can contain various parameters, the network device can indicate the change of the configuration of various SS / PBCH blocks, and the terminal device can determine the valid RO based on the changed configuration.

[0011] In combination with the first aspect, in some implementations of the first aspect, the effective time of the valid RO is determined based on the time of receiving the first information, or the effective time of the valid RO is determined based on the effective time of the second configuration.

[0012] In combination with the first aspect, in some implementations of the first aspect, the effective time of the valid RO is: the starting time of the next physical random access channel (PRACH) slot of the slot in which the first information is located; or the starting time of the slot in which the SS / PBCH of the second configuration is located.

[0013] Based on the above technical solution, when the terminal device determines the valid RO based on the second configuration, the terminal device can also determine the effective time of the valid RO, further enhancing the reliability of the transmitted PRACH.

[0014] In combination with the first aspect, in some implementations of the first aspect, the first information is carried in a downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

[0015] Based on the above technical solution, the network device can dynamically adjust the configuration of the SS / PBCH block, supporting flexible transmission modes.

[0016] The second aspect provides a communication method. The method can be applied to the network side, that is, the method can be executed by a network device, or can be executed by a component (such as a chip or a chip system or a circuit or a communication module) of the network device, which is not limited in the present application. The following will be mainly described taking the network device as an example.

[0017] The method can include: sending first information, the first information indicating that a configuration of a synchronization signal physical broadcast channel, SS / PBCH, block is changed from a first configuration to a second configuration, wherein the second configuration is also used to determine a valid random access channel occasion, RO.

[0018] With reference to the second aspect, in some implementations of the second aspect, the configuration of the SS / PBCH block includes one or more of: a periodicity of a synchronization signal block, SSB, burst set to which the SS / PBCH block corresponds, a set of beams associated with the SSB burst set to which the SS / PBCH block corresponds, or a transmission state of the SSB burst set.

[0019] With reference to the second aspect, in some implementations of the second aspect, the effective time of the valid RO is determined based on a time of receiving the first information, or the effective time of the valid RO is determined based on an effective time of the second configuration.

[0020] With reference to the second aspect, in some implementations of the second aspect, the effective time of the valid RO is a start time of a next physical random access channel, PRACH, slot of a slot in which the first information is located, or a start time of a slot in which the SS / PBCH of the second configuration is located.

[0021] With reference to the second aspect, in some implementations of the second aspect, the first information is carried in a downlink control information, DCI, and / or a medium access control-control element, MAC-CE.

[0022] The beneficial effects and possible designs related to the second aspect can be refer to the related description in the first aspect, and will not be repeated here.

[0023] A third aspect provides a communication method. The method can be applied to a terminal side, i.e., the method can be executed by a terminal device, or can be executed by a component (such as a chip or a chip system or a circuit or a communication module) of the terminal device, and the present application does not limit this. Hereinafter, the terminal device will be mainly taken as an example for description.

[0024] The method can include: receiving control information, the control information indicating that a set of beams associated with a synchronization signal block, SSB, burst set to which a synchronization signal physical broadcast channel, SS / PBCH, block corresponds is changed from a first set of beams to a second set of beams; and determining a mapping relationship between the second set of beams and a random access channel occasion, RO, based on the control information.

[0025] Based on the technical solution, in the case that the beam set associated with the SSB burst set is changed from the first beam set to the second beam set, the terminal device can determine the mapping relationship between the RO and the second beam set instead of still using the mapping relationship between the first beam set and the RO. The technical solution proposes an updating mechanism for timely determining the SSB-RO mapping relationship, and can realize reliable PRACH transmission.

[0026] With reference to the third aspect, in some implementations of the third aspect, the effective time of the mapping relationship is determined based on a time of receiving the control information, or the effective time of the mapping relationship is determined based on an effective time of the second beam set.

[0027] With reference to the third aspect, in some implementations of the third aspect, the effective time of the mapping relationship is: a start time of a next physical random access channel (PRACH) slot of a slot in which the control information is located; or a start time of a next SSB-PRACH mapping time interval of the slot in which the control information is located; or a start time of a next PRACH association period of the slot in which the control information is located; or a start time of a next PRACH association pattern period of the slot in which the control information is located; or a start time of a slot in which a SSB / PBCH block associated with the second beam set is located.

[0028] Based on the technical solution, when the terminal device determines the mapping relationship based on the second beam set, the terminal device can also determine the effective time of the mapping relationship, further enhancing the reliability of transmitting the PRACH.

[0029] With reference to the third aspect, in some implementations of the third aspect, the control information is carried in a downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

[0030] Based on the above technical solution, the network device can dynamically adjust the beam set associated with the SSB burst set, supporting flexible transmission modes.

[0031] The fourth aspect provides a communication method. The method can be applied to the network side, that is, the method can be executed by a network device or a component (such as a chip or a chip system or a circuit or a communication module) of the network device, and the present application does not limit this. Hereinafter, the network device will be mainly taken as an example for description.

[0032] The method can include: sending control information, the control information indicating that a beam set associated with a synchronization signal physical broadcast channel (SS / PBCH) block corresponding to a SSB burst set is changed from a first beam set to a second beam set, wherein the control information is also used to determine a mapping relationship between the second beam set and a valid random access channel occasion (RO).

[0033] In some implementations of the fourth aspect, the effective time of the mapping relationship is determined based on a time of receiving the control information, or the effective time of the mapping relationship is determined based on an effective time of the second beam set.

[0034] In some implementations of the fourth aspect, the effective time of the mapping relationship is a start time of a next physical random access channel (PRACH) slot of a slot where the control information is located, or a start time of a next round of SS / PBCH-PRACH mapping time interval of the slot where the control information is located, or a start time of a next PRACH association period of the slot where the control information is located, or a start time of a next PRACH association pattern period of the slot where the control information is located, or a start time of a slot where an SS / PBCH block associated with the second beam set is located.

[0035] In some implementations of the fourth aspect, the control information is carried in a downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

[0036] The beneficial effects and possible designs related to the fourth aspect can be referred to the related description of the third aspect, which will not be repeated here.

[0037] The fifth aspect provides a communication apparatus for performing the method in any of the first aspect to the fourth aspect and any possible implementation thereof. Specifically, the apparatus can include units and / or modules for performing the method in any of the first aspect to the fourth aspect and any possible implementation thereof, such as a processing unit and / or a communication unit.

[0038] In an implementation, the apparatus is a communication device (e.g., a terminal device, or a network device). When the apparatus is a communication device, the communication unit can be a transceiver, or an input / output interface; and the processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0039] In another implementation, the apparatus is a chip, chip system or circuit or communication module for a communication device (e.g., a terminal device, or a network device). When the apparatus is a chip, chip system or circuit for a communication device, the communication unit can be an input / output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc.; and the processing unit can be at least one processor, processing circuit or logic circuit, etc.

[0040] In a sixth aspect, a communication apparatus is provided, the apparatus comprising at least one processor configured to cause the apparatus to perform the method in any one of the first aspect to the fourth aspect and any possible implementation thereof.

[0041] Optionally, the at least one processor is configured to execute computer program or instructions to perform the method in any one of the first aspect to the fourth aspect and any possible implementation thereof.

[0042] Optionally, the apparatus further comprises a memory for storing the computer program or instructions.

[0043] Optionally, the at least one processor is coupled with the memory for storing the computer program or instructions. The memory can be external to the apparatus.

[0044] Optionally, the apparatus further comprises a communication interface through which the processor reads the instructions on the memory. It can be understood that the communication interface is coupled with the processor, and can be used to input the computer program or instructions to the processor, or output the information in the processor.

[0045] For the operations involved in sending and acquiring / receiving, etc., if no special description is given, or if it does not contradict the actual role or inherent logic in the related description, it can be understood as output, input, etc., or as sending and receiving operations performed by the radio frequency circuit and the antenna, which are not limited in the present application.

[0046] In an implementation manner, the apparatus is a communication device (e.g., a terminal device, or a network device).

[0047] In another implementation manner, the apparatus is a chip, a chip system or a circuit or a communication module for a communication device (e.g., a terminal device, or a network device). Optionally, the chip is a Modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core.

[0048] In a seventh aspect, a computer readable storage medium is provided, the computer readable medium having stored thereon computer programs (e.g., program codes) or instructions, which, when run on a communication apparatus, cause the communication apparatus to perform the method in any one of the first aspect to the fourth aspect and any possible implementation thereof.

[0049] In an eighth aspect, a computer program product including instructions, which, when executed on a computer, cause the computer to perform the method of any one of the first aspect to the fourth aspect and any possible implementation thereof.

[0050] In a ninth aspect, a communication system is provided, including a first communication apparatus and a second communication apparatus. The first communication apparatus is configured to perform the method provided in any one of the implementations of the first aspect, and the second communication apparatus is configured to perform the method provided in any one of the implementations of the second aspect; or the first communication apparatus is configured to perform the method provided in any one of the implementations of the third aspect, and the second communication apparatus is configured to perform the method provided in any one of the implementations of the fourth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0051] FIG. 1 is a schematic diagram of an architecture of a communication system 1000 to which embodiments of the present application are applied.

[0052] FIG. 2 is a schematic diagram of various time units.

[0053] FIG. 3 is a schematic diagram of a structure of a time-frequency resource of an SS / PBCH block.

[0054] FIG. 4 is a schematic diagram of an SSB burst set.

[0055] FIG. 5 is a schematic diagram of a transmission period of an SSB burst set.

[0056] FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application.

[0057] FIG. 7 is a schematic diagram of a first method of determining an effective RO taking effect time provided by an embodiment of the present application.

[0058] FIG. 8 is a schematic diagram of a second method of determining an effective RO taking effect time provided by an embodiment of the present application.

[0059] FIG. 9 is a schematic flowchart of another communication method provided by an embodiment of the present application.

[0060] FIG. 10 is a schematic diagram of a mapping relationship provided by an embodiment of the present application.

[0061] FIG. 11 is a schematic diagram of a communication apparatus 1100 provided by an embodiment of the present application.

[0062] FIG. 12 is a schematic diagram of another communication apparatus 1200 provided by an embodiment of the present application.

[0063] FIG. 13 is a schematic diagram of a chip system 1300 provided by an embodiment of the present application. DETAILED DESCRIPTION

[0064] The technical solutions in the present application will be described below with reference to the drawings.

[0065] (1) In this application, "indication" can include direct indication, indirect indication, explicit indication, implicit indication, etc. When describing that certain indication information indicates A, it can be understood that the indication information carries A, carries an identifier of A, carries B having an association relationship with A, carries an identifier of B having an association relationship with A, etc. In other words, if the receiving side of certain indication information can determine A according to the indication information, it can be described that the indication information indicates A, and the specific determination is not limited. When it is understood that the indication information carries A, "indication" can be replaced by "includes", at this time, similar to the expression "sending / receiving indication information, the indication information indicates A", it can be replaced by "sending / receiving A".

[0066] In this application, the information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, wherein the other information has an association relationship with the to-be-indicated information. The to-be-indicated information can also be only indicated a part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be realized by means of the arrangement order of each information agreed in advance (for example, the protocol stipulates), thereby reducing the indication overhead to a certain extent. In addition, the to-be-indicated information can be sent as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending time of these sub-information can be the same or different.

[0067] (2) In this application, the expression " / " is used to represent that the objects before and after the association are in an "or" relationship; for example, A / B can represent A or B. The expression "and / or" is used to represent that the objects before and after the association can be in an "and" association relationship or an "or" association relationship; for example, A and / or B can represent the following cases: A exists alone, B exists alone, A and B exist together, wherein A and B can be single or multiple. "At least one of the following" or similar expressions are used to represent any combination of the listed items; for example, at least one of A, B and (or) C can represent the following cases: A exists alone, B exists alone, C exists alone, A and B exist together, B and C exist together, A and C exist together, A, B and C exist together, wherein A, B and C can be single or multiple.

[0068] (3) In this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which may include direct transmission via the air interface or indirect transmission by other units or modules via the air interface. "Receive information from YY" can be understood as the source of the information being YY, which may include direct reception from YY via the air interface or indirect reception from YY by other units or modules via the air interface. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface. In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via a bus, wiring, or interface.

[0069] (4) In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terms and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0070] (5) In this application, "first," "second," and "#1," "#2," and "#A" are merely for descriptive convenience and are used to distinguish objects, and are not intended to limit the scope of the embodiments of this application. They are not used to describe the order or sequence of features. It should be understood that such described objects can be interchanged where appropriate in order to describe solutions other than those in the embodiments of this application.

[0071] (6) In this application, "predefined" can mean a standard protocol predefined, or it can mean a pre-agreed or pre-negotiated agreement between devices. Here, "protocol" can refer to a standard protocol in the field of communications, for example, it may include fourth-generation (4G) protocols. th Generation 4G network, fifth generation (5G) network th This application does not limit the scope to network protocols such as 5G (generation, 5G), New Radio (NR), 5.5G, and related protocols applied in future communication networks.

[0072] (7) In this application, the words "example," "such as," and "for example" are used to mean that an implementation so described is one among many possible implementations. No inference should be drawn that any other implementation is "preferred" or "constitutes all other implementations." The word "example" is used herein to mean one of a number of possible implementations, and not necessarily the preferred or advantageous implementation. In the embodiments of this application, "of", "corresponding" and "corresponding" are sometimes mixed. It should be pointed out that when there is no emphasis on their differences, the meanings expressed are consistent.

[0073] First, introduce the communication system applicable to this application.

[0074] The technical solutions provided by the present application can be applied to various communication systems, such as: 5th generation (5th generation, 5G) or new radio (new radio, NR) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, etc. The technical solutions provided by the present application can also be applied to future communication network systems. The technical solutions provided by the present application can also be applied to device to device (device to device, D2D) communication, vehicle to everything (vehicle-to-everything, V2X) communication, machine to machine (machine to machine, M2M) communication, machine type communication (machine type communication, MTC), and internet of things (internet of things, IoT) communication system. The technical solutions provided by the present application can also be applied to non-terrestrial communication network (non-terrestrial network, NTN) system such as inter-satellite communication and satellite communication.

[0075] As an example, the satellite communication system includes a satellite base station and a terminal device. The satellite base station provides communication services for the terminal device. The satellite base station can also communicate with the base station. The satellite can act as a base station, and also as a terminal device. Among them, the satellite can refer to unmanned aerial vehicle, hot air balloon, low earth orbit satellite, medium earth orbit satellite, high earth orbit satellite, etc. The satellite can also refer to non-ground base station or non-ground device, etc.

[0076] As an example, V2X communication can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication.

[0077] A device in a communication system can send a signal to another device or receive a signal from another device. Wherein the signal can include information, signaling or data, etc. Wherein the device can also be replaced by an entity, a network entity, a communication device, a communication module, a node, a communication node, etc. In the embodiments of the present application, the device is taken as an example for description.

[0078] The terminal device in the embodiments of the present application can be a device or module with corresponding communication functions for accessing the above-mentioned communication system. The terminal device can include various devices with wireless communication functions, which can be used to connect people, things, machines, etc. The terminal device can be widely used in various scenarios, such as cellular communication, D2D, V2X, end-to-end, M2M, MTC, IoT, virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city UAV, robot, remote sensing, passive sensing, positioning, navigation, autonomous delivery, etc. The terminal device can be a terminal in any of the above scenarios, such as an MTC terminal, an IoT terminal, etc. The terminal device can be a user equipment (UE) of the 3rd generation partnership project (3GPP) standard, a terminal, a fixed device, a mobile station device or a mobile device, a subscriber unit, a handset, a vehicle-mounted device, a wearable device, a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a notebook computer, a wireless modem, a handset, a laptop computer, a computer with wireless transceiver function, a smart book, a vehicle, a satellite, a global positioning system (GPS) device, an aircraft (such as a drone, a helicopter, a multi-copter, a quad-copter, or an airplane, etc.), a ship, a remote control device, a smart home device, an industrial device, a transport vehicle with wireless communication function, a communication module, a road side unit (RSU) with terminal function, or a device built-in in the above-mentioned device (such as a communication module, a modem or a chip in the above-mentioned device, etc.), or other processing devices connected to the wireless modem.

[0079] It should be understood that in some scenarios, the UE can also be used as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X, D2D or end-to-end scenarios, etc.

[0080] In the embodiments of the present application, the device for implementing the function of the terminal device, i.e., the terminal device, can be a terminal device or a device capable of supporting the terminal device to implement the function, such as a chip system or a chip or a circuit or a communication module (i.e., a communication module performing a communication function), which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip or can include a chip and other discrete devices. In addition, the device can also be configured with program instructions for performing corresponding communication functions.

[0081] The network device in the embodiments of the present application can be a device or a module with a corresponding communication function. The network device can be a device for communicating with the terminal device, and the network device can also be referred to as an access network device or a radio access network device, such as a network device, which can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) for accessing the terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmission point, primary station, secondary station, motor slide retainer (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, a modem or a chip for being arranged in the foregoing device or apparatus. The base station can also be a mobile switching center and a device assuming a base station function in D2D, V2X, M2M communication, a network side device in a future communication network, a device assuming a base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network device.

[0082] A base station can be fixed, or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, with one or more cells moving according to the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0083] In some deployments, the network device mentioned in embodiments of the present application can be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane (CU-CP)) and a user plane CU node (central unit-user plane (CU-UP)), and a DU node.

[0084] In some deployments, a plurality of RAN nodes cooperate to assist a terminal device to implement wireless access, and different RAN nodes respectively implement part of the functions of a base station. For example, a RAN node can be a CU, a DU, a CU-CP, a CU-UP, or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can also be included in the same network element, such as a BBU. The RU can be included in a radio frequency device or a radio frequency unit, such as an RRU, an AAU, or an RRH.

[0085] In different systems, the CU (or CU-CP and CU-UP), DU, or RU can also have different names, but those skilled in the art can understand their meanings. For example, the wireless access network can also be an open radio access network (O-RAN) architecture, in which the CU can also be referred to as an open CU (O-CU), the DU can also be referred to as an open DU (O-DU), the CU-CP can also be referred to as an open CU-CP (O-CU-CP), the CU-UP can also be referred to as an open CU-UP (O-CU-UP), and the RU can also be referred to as an open RU (O-RU). Any of the CU (or CU-CP, CU-UP), DU, and RU in the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0086] In the embodiments of the present application, the device for implementing the function of the network device can be the network device, or can be a device capable of supporting the network device to implement the function, such as a chip system or a chip or a circuit or a communication module (i.e., a communication module performing a communication function), which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices. In addition, program instructions for performing corresponding communication functions can also be configured in the device. In the embodiments of the present application, only the device for implementing the function of the network device is taken as an example for description, and the scheme of the embodiments of the present application is not limited.

[0087] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; and can also be deployed on airplanes, balloons and satellites in the air. The scenarios in which the network device and the terminal device are located are not limited in the embodiments of the present application.

[0088] A communication system suitable for the embodiments of the present application is briefly introduced in combination with FIG. 1, as follows.

[0089] Referring to FIG. 1, FIG. 1 is a schematic diagram of a wireless communication system suitable for the embodiments of the present application, as an example. As shown in FIG. 1, the wireless communication system includes a radio access network 100. The radio access network 100 can be a next-generation (for example, future or higher version) radio access network, or a traditional (for example, 5G, 4G, 3G or 2G) radio access network. One or more terminal devices (120a-120j, collectively referred to as 120) can be connected to each other or connected to one or more network devices (110a, 110b, collectively referred to as 110) in the radio access network 100. The network elements in the wireless communication system are connected through an interface (for example, NG, Xn), or connected through an air interface.

[0090] In the communication between the network device and the terminal device, the network device can manage one or more cells, and each cell can include at least one terminal device. The cell can be understood as an area within the coverage range of the wireless signal of the network device.

[0091] FIG. 1 is only a schematic diagram, and the wireless communication system can also include other devices, such as core network devices, wireless relay devices and / or wireless backhaul devices, etc., which are not shown in FIG. 1.

[0092] In order to facilitate the understanding of the embodiments of the present application, the terms involved in the present application are briefly explained.

[0093] 1. Time domain resource

[0094] Currently, the communication system defines time units of various lengths to implement resource scheduling. In the following, various types of time units are exemplarily explained in combination with FIG. 2.

[0095] Referring to FIG. 2, FIG. 2 is a schematic diagram of various time units. In the time domain, the time units defined by NR include: frame, subframe, slot, and symbol. Among them, the length of a frame is fixed at 10 milliseconds (ms), and the frame number ranges from 0 to 1023. The length of a subframe is fixed at 1 ms, and the subframe number ranges from 0 to 9. Regarding the slot, when a normal cyclic prefix (CP) is used, the length is 14 symbols. The length of a symbol is not fixed and is related to the subcarrier spacing (SCS).

[0096] In the data domain, the network is scheduled in units of slots. As mentioned above, the number of symbols contained in a slot is fixed. However, since the length of a symbol is related to the SCS, the length of a slot is not fixed. For example, when SCS = 15 kilo Hertz (kHz), 1 subframe (length 1 ms) includes 1 slot. When SCS = 120 kHz, 1 subframe (length 1 ms) includes 8 slots.

[0097] It should be noted that the above-mentioned time units are exemplary and the present application does not exclude other time units defined in the future.

[0098] 2. SS / PBCH block

[0099] The SS / PBCH block, which can also be referred to as SSB in some implementations, includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The PSS and the SSS can be collectively referred to as synchronization signals. The PBCH can carry demodulation reference signals (DMRS).

[0100] 2.1 SS / PBCH block time-frequency resource structure

[0101] Referring to FIG. 3, FIG. 3 is a schematic diagram of the time-frequency resource structure of an SS / PBCH block. The SSB occupies 4 consecutive symbols in the time domain and 20 resource blocks (RBs) in the frequency domain, where one RB includes 240 subcarriers. For ease of description, the 4 symbols in the time domain are denoted as OS#0-3, and the 240 subcarriers in the frequency domain are denoted as subcarrier #0-239.

[0102] PSS is located in the middle of 127 subcarriers (i.e. subcarriers #56-182) of OS#0. SSS is located in the middle of 127 subcarriers (i.e. subcarriers #56-182) of OS#2. PBCH is located in 240 subcarriers (i.e. subcarriers #0-239) of OS#1 and OS#3, and in the middle of OS#2 (i.e. subcarriers #0-47 and subcarriers #192-239).

[0103] 2.2 SSB burst set

[0104] Referring to FIG. 4, FIG. 4 is a schematic diagram of a SSB burst set. In NR, SS / PBCH blocks are transmitted in the form of beam sweeping, i.e. a base station can transmit a beam direction at a certain time, and through multiple time directions, the entire cell needs to be covered. A round of beam sweeping transmits N SS / PBCH blocks in different directions, and the total N SS / PBCH blocks transmitted in this round are called a SSB burst set, and N is a positive integer.

[0105] UEs continuously perform cell search and measurement based on SS / PBCH blocks when moving in the system, select appropriate SS / PBCH block beams, and achieve UE initial access and mobility management.

[0106] 2.3 SSB burst set transmission period

[0107] Referring to FIG. 5, FIG. 5 is a schematic diagram of a SSB burst set transmission period. NR specifies that the period of a SSB burst set is 20 ms for UE initial access. A SSB burst set period includes a transmission window, and the length of the transmission window is half a frame (i.e. 5 ms). In other words, in a 20 ms SSB burst set period, the network transmits N SS / PBCH blocks in a 5 ms transmission window, and does not transmit for the remaining 15 ms.

[0108] 2.4 Network energy saving (NES) technology of SS / PBCH block

[0109] NES technology supports various techniques for changing signal transmission in the time domain to reduce the overhead and power consumption of the base station side, and achieve the effect of network energy saving. A cell that can support such a technology is called a network energy saving cell (NES cell).

[0110] In some implementations, the base station supports on-demand transmission of SS / PBCH blocks. Unlike always-on SS / PBCH blocks, the base station can support on-demand transmission on a secondary cell, i.e., no SS / PBCH block is transmitted on the secondary cell when there is no demand, the base station transmits an SS / PBCH block and sends signaling to indicate the UE to receive the SS / PBCH block when there is a demand. The demand can be a need for cell measurement, time-frequency synchronization, secondary cell activation, etc. using the SS / PBCH block. In this way, the base station can dynamically decide whether to transmit an SS / PBCH block signal based on whether there is a demand, and compared to the strategy of always transmitting an SS / PBCH block signal, energy saving is achieved.

[0111] In other implementations, the base station can support changing the time-domain characteristics of SS / PBCH blocks on a primary cell or a secondary cell. The base station sends signaling to the UE to inform the UE of the information of the changed time-domain characteristics of the SS / PBCH block (such as lengthening the SSB burst set transmission period), and transmits an SS / PBCH block with different time-domain characteristics. The UE receives the SS / PBCH block according to the new configuration.

[0112] In this way, the base station can dynamically adjust the SSB burst set transmission period, the number and position of beams (for example, in the middle of the night when there are few users, the transmission mode of the SS / PBCH block can be changed to one with a longer period and fewer beams) according to actual demand, and compared to the strategy of always transmitting an SS / PBCH block signal with a fixed period and the number and position of beams being always fixed, energy saving is achieved.

[0113] 3. PRACH

[0114] After completing cell search through SSB, the UE has obtained downlink synchronization with the cell, so the UE can receive downlink data. However, the UE can only obtain uplink resources and perform uplink transmission after obtaining uplink synchronization with the cell. The UE establishes a connection with the cell and obtains uplink synchronization through a random access procedure. Once the random access is completed, the UE is in a connected state, and the UE and the base station can communicate through dedicated transmission.

[0115] Random access is the first information initiated by the UE to the base station after the UE is turned on. It is called random access because from the perspective of the base station, it seems to acquire the first UE signal in a random manner, because it does not know when the user turns on the UE.

[0116] PRACH is an uplink channel used to transmit a random access preamble (PRACH preamble) in the random access procedure.

[0117] Through RRC configuration, the base station stipulates which time-frequency resources the UE can send PRACH on, and these time-frequency resources stipulated by the base station are called RACH transmission occasions (Occasion), abbreviated as RO.

[0118] It should be noted that the RO is a set of time-frequency resources that the UE can select for sending PRACH, and whether to send or not is determined by the UE.

[0119] It should also be noted that the RRC-configured RO includes valid ROs. The UE determines the valid ROs and sends the PRACH preamble on the valid ROs.

[0120] According to the above description of the SSB, the base station will transmit multiple SSB beams, and the UE can search and measure these beams and select a good quality beam for camping. According to the above rules, the UE can determine the RO (time-frequency resource for actually sending PRACH) based on the selected SSB and send PRACH in the beam direction.

[0121] It should be noted that the base station receives PRACH and can determine the beam selected by the UE based on the mapping relationship between SSB-RO for subsequent downlink transmission. Among them, the mapping between SSB-RO follows the following rules:

[0122] First, map in ascending order of PRACH preamble index within an RO; second, map in ascending order of frequency domain RO; then, map in ascending order of time domain RO within a PRACH slot; and finally, map in ascending order of PRACH slot.

[0123] Through the above rules, the UE can one-to-one map the index of the valid RO and the index of the SSB after receiving the RRC configuration information. Then, when the UE sends PRACH preamble on a certain valid RO, the base station can know which SSB the UE selects according to the mapping relationship, thereby achieving bidirectional information exchange.

[0124] From the above description, it can be seen that SSB and PRACH are related, and the related technology defines the related determination process of RO, so that the UE and the base station can achieve information alignment. However, for the case of variable SS / PBCH blocks, such as the NES technology of SS / PBCH blocks, the understanding of the UE and the base station about how to determine PRACH is not clear.

[0125] The method provided by the embodiments of the present application will be described in detail below with reference to the drawings. The embodiments provided by the present application can be applied to the scenario shown in the above figures, without limitation. In addition, the terms involved below can refer to the previous explanation, which will not be repeated hereinafter. In addition, the following is described by way of example with terminal device and network device. The terminal device can be replaced by a terminal device or a component of the terminal device (for example, a chip or a chip system or a circuit or a communication module), and the network device can be replaced by a component of the network device (for example, a chip or a chip system or a circuit or a communication module). In addition, the steps described below can also be divided into steps executed by multiple execution subjects, which can be logically and / or physically separated.

[0126] Referring to FIG. 6, FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application.

[0127] S610, the network device sends first information to the terminal device. Correspondingly, the terminal device receives the first information from the network device.

[0128] The first information indicates that the configuration of the SS / PBCH block is changed from a first configuration to a second configuration. After receiving the first information, the terminal device can receive the SS / PBCH block based on the new second configuration.

[0129] The configuration of the SS / PBCH block can include various parameters. In some implementations, the configuration of the SS / PBCH block can be understood as a parameter set, which includes parameters such as time domain parameters, frequency domain parameters, or spatial domain parameters. For example, the configuration of the SS / PBCH block can include one or more of the following: an SSB burst set period corresponding to the SS / PBCH block, a beam set associated with the SSB burst set corresponding to the SS / PBCH block, and a transmission state of the SSB burst set.

[0130] The first configuration is changed to the second configuration, which can mean the change of any one or more parameters. That is, the SS / PBCH block is changed from the first configuration to the second configuration, in some cases, the time domain, frequency domain, and / or spatial domain characteristics of the SS / PBCH block are changed. In order to facilitate the understanding of the embodiments of the present application, some change cases are described by way of example as follows:

[0131] Case 1: The SSB burst set period corresponding to the SS / PBCH block is changed from a first period to a second period.

[0132] For example, in the first configuration, the network device transmits the SSB burst set with a first period (such as 5ms); in the second configuration, the network device transmits the SSB burst set with a second period (such as 10ms).

[0133] Case 2: The beam set associated with the SSB burst set corresponding to the SS / PBCH block changes from a first beam set to a second beam set.

[0134] Exemplarily, in the first configuration, the network device transmits the SSB by using the beams in the first beam set; in the second configuration, the network device transmits the SSB by using the beams in the second beam set. Wherein, the number and / or position of the beams in the first beam set and the beams in the second beam set can be different.

[0135] Case 3: The transmission state of the SSB burst set corresponding to the SS / PBCH block changes from a first state to a second state.

[0136] Exemplarily, the transmission state of the SSB burst set corresponding to the SS / PBCH block changes from a stop transmitting state to a transmitting state, i.e., the SSB burst set starts transmitting. Exemplarily, the transmission state of the SSB burst set corresponding to the SS / PBCH block changes from a transmitting state to a stop transmitting state, i.e., the SSB burst set stops transmitting.

[0137] The first information can indicate the change of the first configuration to the second configuration in multiple ways. The first information can explicitly, or implicitly, directly or indirectly indicate the change of the first configuration to the second configuration.

[0138] Exemplarily, the first information can include a field (or bit, parameter, information, information field, hereinafter uniformly use "field" as an example) indicating the relevant parameters of the change. For example, the first information includes field #1, which can indicate the transmission state of the SSB burst set by using 1 bit. In the case of the bit being 1, it indicates that the SSB burst set starts transmitting; in the case of the bit being 0, it indicates that the SSB burst set stops transmitting.

[0139] For another example, the first information can comprise a field indicating a relevant parameter of the second configuration after the change. For example, the first information comprises a field #2, and the field #2 indicates a period (i.e., the second period) of the SSB burst set after the change. It should be noted that the period indicated by the field #2 is different from the current period, so that the terminal device can learn from the field #2 that the period of the SSB burst set has changed. For another example, the first information comprises a field #3, and the field #3 indicates a beam set (i.e., the second beam set) after the change. In a possible implementation, the field #3 can indicate the second beam set in the form of a bitmap. For example, the SSB pattern comprises four beams: beam #1, beam #2, beam #3 and beam #4. When the field #3 is set to 0101, it indicates that the second beam set comprises the beam #2 and the beam #4. When the field #3 is set to 1111, it indicates that the second beam set comprises all the four beams. Alternatively, the first information can further comprise a field indicating the number of beams in the second beam set, or the terminal device can learn the number of beams after the change from the bitmap field #3. The SSB pattern can be predefined or preconfigured (e.g., by RRC) by the network device, which is not particularly limited in the present application.

[0140] For another example, the first information can comprise an index indicating the second configuration (or the changed parameter in the second configuration). For example, the first information comprises a field #4, and the field #4 indicates an identity of the second configuration. The terminal device can be configured with multiple SSB candidate configurations, and the frequency domain characteristics, time domain characteristics and / or spatial domain characteristics in the multiple SSB candidate configurations are different. For example, when the network device configures a serving cell, the serving cell is configured with five SSB candidate configurations. When the field #4 is set to 001, it indicates the first SSB candidate configuration, e.g., a period of 5 ms and located in frequency band 1. When the field #4 is set to 010, it indicates the second SSB candidate configuration, e.g., a period of 20 ms and located in frequency band 2. And so on. For another example, the first information comprises a field #5, and the field #5 indicates a period identity corresponding to the second period. The terminal device can be configured with multiple candidate periods, e.g., 5 ms, 10 ms, 20 ms, 40 ms and 80 ms in sequence, so that the field #5 can use three bits, e.g., 001 indicates the candidate period of 5 ms, and 010 indicates the candidate period of 10 ms. The present application does not particularly limit this. It should be noted that the above candidate configurations and candidate periods can be predefined by the protocol or preconfigured (e.g., by RRC) by the base station for the serving cell, which is not particularly limited in the present application.

[0141] It should be noted that the present application does not exclude other possible implementation manners of the first information indicating that the first configuration is changed to the second configuration.

[0142] The network device can send the first information in multiple ways. For example, the first information can be carried in downlink control information (DCI), medium access control - control element (MAC-CE), or a combination thereof. That is, the network device can dynamically adjust the configuration of the SS / PBCH.

[0143] In some possible implementation manners, the first information further indicates a validity time of the second configuration. For example, the first information can indicate a time unit index corresponding to the validity time of the second configuration, or the first information can indicate an offset value between the validity time of the second configuration and the time of receiving the first information. In other possible implementation manners, the validity time (or the offset value) of the second configuration can be predefined or preconfigured. Thus, the terminal device can know from which time point to receive the SS / PBCH block based on the new configuration.

[0144] In S620, the terminal device determines the valid RO based on the second configuration.

[0145] After receiving the first information, the terminal device can receive the SS / PBCH block of the new configuration (the second configuration) based on the first information. As can be known from S610, the time domain characteristics of the SS / PBCH block of the second configuration are changed in some implementation manners, and if the process of determining the valid RO by the terminal device again is not introduced, the terminal device will still use the valid RO determined based on the first configuration to perform PRACH transmission, which may cause transmission failure. In the embodiment of the present application, the terminal device determines the valid RO based on the second configuration, and the present application proposes a determination mechanism for updating the valid RO in time, to realize reliable PRACH transmission.

[0146] The terminal device can determine the valid RO based on the related parameters of the second configuration (such as the SSB burst combination period, etc.). For example, before this step, the network device can send RRC configuration information to the terminal device, and the RRC configuration information indicates the time domain position and the frequency domain position of the RO, and the terminal device determines the RO based on the RRC configuration information. For example, the terminal device can determine the time domain resource of PRACH through the “prach-ConfigurationIndex” parameter, and determine the frequency domain resource of PRACH through the “msg1-FrequencyStart” and “msg1-FDM” parameters, that is, determine the time-frequency domain position of the RO. Then, the terminal device can determine the valid RO in the RO configured by the RRC configuration information based on the second configuration.

[0147] Exemplarily, when the tdd-UL-DL-ConfigCommon parameter is configured in the information element ServingCellConfigCommon in the RRC configuration information, the RO meeting the condition 1 or the condition 2 is a valid RO.

[0148] Condition 1: The RO is located in an UL symbol.

[0149] Condition 2: The RO is after an SS / PBCH block (a second configured SS / PBCH block), and the RO is after at least N gap symbols of the last DL symbol, and the RO is after at least N gap symbols of the last transmitted SS / PBCH block symbol. Wherein, N gap is an RRC configuration parameter.

[0150] When the tdd-UL-DL-ConfigCommon parameter is not configured in the information element ServingCellConfigCommon in the RRC configuration information, the RO meeting the condition a is a valid RO.

[0151] Condition a: The RO is after an SS / PBCH block (a second configured SS / PBCH block), and the RO is after at least N gap symbols of the last received SS / PBCH symbol.

[0152] In some implementations, the effective time of the valid RO determined based on the second configuration is determined based on the time of receiving the first information. In other implementations, the effective time of the valid RO determined based on the second configuration is determined based on the effective time of the second configuration. That is, when the terminal device determines the valid RO based on the second configuration, the terminal device can also determine the effective time of the valid RO, further enhancing the reliability of transmitting the PRACH.

[0153] In a possible implementation, the effective time of the valid RO is the starting time of the next PRACH slot of the slot in which the first information is located. Wherein, the PRACH slot is a slot in which there is an RO and the PRACH can be transmitted. As can be seen from the above, in some embodiments, the terminal device can determine the PRACH slot based on the RRC configuration.

[0154] Exemplarily, referring to FIG. 7, FIG. 7 is a schematic diagram of a first determination of the effective time of the valid RO provided by an embodiment of the present application. The first information indicates that the SSB burst set period is changed from 5 ms to 160 ms. The terminal device receives the first information in the fourth slot, and then the terminal device determines the valid RO based on the second configuration, and the valid RO starts to take effect from the first PRACH slot (i.e., the sixth slot) next.

[0155] In another possible implementation, the effective time of the effective RO is the start time of the time slot in which the second configured SS / PBCH block is located.

[0156] Exemplarily, referring to FIG. 8, FIG. 8 is a schematic diagram of a second determination of the effective time of the effective RO according to an embodiment of the present application. The first information indicates the second configuration of the SS / PBCH block, that is, the corresponding beam set is changed from the first beam set to the second beam set, the first beam set contains 4 beams, and the second beam set contains 32 beams. The effective time of the second configuration is the start time of the next time slot (i.e., the 5th time slot) of the time slot (i.e., the 4th time slot) in which the first information is located. Then the effective RO determined by the terminal device based on the second configuration takes effect from the 5th time slot.

[0157] It should be noted that in the case where the configuration of the SS / PBCH block is changed from the first configuration to the second configuration, the effective RO determined by the terminal device based on the second configuration can be the same as the effective RO corresponding to the first configuration, which is not excluded by the present application.

[0158] It should also be noted that in the embodiments of the present application, the description of the start time of a time slot (such as the 1st time slot) can also be replaced by the end time of the previous time slot of the 1st time slot, which is not particularly limited in the present application.

[0159] Based on the technical solution, in the case where the configuration of the SS / PBCH block is changed from the first configuration to the second configuration, the terminal device will determine the effective RO based on the second configuration, instead of still using the effective RO determined based on the first configuration. The technical solution proposes an updating mechanism for timely determining the effective RO, and can realize reliable transmission of the PRACH.

[0160] The above describes a determination mechanism for timely updating the effective RO in combination with FIGS. 6 to 8. As known from the foregoing introduction of the PRACH, the configuration of the SS / PBCH block also affects the mapping relationship between the SSB-ROs. The present application also proposes an updating mechanism for timely determining the mapping relationship, which is described below in combination with FIGS. 9 and 10.

[0161] Referring to FIG. 9, FIG. 9 is a schematic flowchart of another communication method according to an embodiment of the present application.

[0162] S910, the network device sends control information to the terminal device. Correspondingly, the terminal device receives the control information from the network device.

[0163] The control information indicates that a beam set associated with a SSB burst set corresponding to the SS / PBCH block is changed from a first beam set to a second beam set. The first beam set contains different beams and / or different locations of beams than the second beam set.

[0164] It should be noted that the control information can indicate the second beam set, which is different from the current first beam set, so that the terminal device knows that the first beam set will be changed to the second beam set.

[0165] Exemplarily, the SSB pattern contains a plurality of beams in which the network device can send SS / PBCH blocks, and the first beam set and the second beam set are different subsets in the SSB pattern, respectively.

[0166] The control information can indicate that the first beam set is changed to the second beam set in various ways. The first information can explicitly or implicitly, directly or indirectly indicate that the first beam set is changed to the second beam set.

[0167] Exemplarily, the control information can include a field indicating the second beam set (or bit, parameter, information, information field, hereinafter uniformly referred to as "field" as an example). For example, the control information includes field#a, and field#a can indicate the second beam set in the form of a bit map. For example, the SSB pattern contains four beams: beam#1, beam#2, beam#3, and beam#4. In the case of 0101 in field#a, it indicates that the second beam set contains beam#2 and beam#4; in the case of 1111 in field#a, it indicates that the second beam set contains all four beams.

[0168] For another example, the control information includes field#b, and field#b indicates the number of beams contained in the second beam set, and the terminal device determines the second beam set in the SSB pattern based on a specific rule. The SSB pattern can be predefined or preconfigured by the network device (such as through RRC), which is not particularly limited in the present application.

[0169] For another example, the control information includes field#c, and field#c indicates the index (identification) of the second beam set. The terminal device can be preconfigured with a plurality of beam sets, such as beam set#0, beam set#1, beam set#2, and beam set#3. Field#c is set to 00 to indicate beam set#0, set to 01 to indicate beam set#1, and so on.

[0170] It should be noted that the present application does not exclude other possible implementation manners of the control information indicating that the first beam set is changed to the second beam set.

[0171] The network device can transmit the control information in multiple ways. Exemplarily, the control information can be carried in a downlink control information (DCI), a medium access control - control element (MAC-CE), or a combination thereof. That is, the network device can dynamically adjust the beam set.

[0172] In some possible implementation manners, the control information further indicates an effective time instant of the second beam set. For example, the control information can indicate an index of a time unit corresponding to the effective time instant of the second beam set, or the control information can indicate an offset value between the effective time instant of the second beam set and a time instant at which the control information is received. In another possible implementation manner, the effective time instant of the second beam set (or the offset value) can be predefined or preconfigured. Thus, the terminal device can know from which time instant the SS / PBCH block is received based on the new configuration.

[0173] S920, the terminal device determines a mapping relationship between the second beam set and the RO.

[0174] After the terminal device receives the control information, the terminal device can receive the SS / PBCH block associated with the new beam set (i.e., the second beam set) based on the control information. If the process of determining the mapping relationship by the terminal device again is not introduced, the terminal device still uses the mapping relationship between the first beam set and the RO before, which may cause transmission failure. In the embodiment of the present application, the terminal device determines the mapping relationship between the RO and the second beam set, and the determination mechanism of updating the SSB-RO mapping relationship in a timely manner is proposed, to realize reliable transmission of the PRACH.

[0175] Exemplarily, the first beam set before the change includes SSB beam #1 and SSB beam #2, and the RO has a mapping relationship with the SSB beam #1 and the SSB beam #2. The second beam set after the change includes SSB beam #3 and SSB beam #4, and the terminal device can cancel the mapping relationship between the RO and the SSB beam #1 and the SSB beam #2, and determine the mapping relationship between the RO and the SSB beam #3 and the SSB beam #4 again.

[0176] In some implementation manners, the effective time instant of the mapping relationship is determined based on the time instant at which the control information is received, or the effective time instant of the mapping relationship is determined based on the effective time instant of the second beam set. That is, when the terminal device determines the mapping relationship based on the second beam set, the terminal device can further determine the effective time instant of the mapping relationship, to further enhance the reliability of the transmission of the PRACH.

[0177] In a first possible implementation, the effective time of the mapping relationship is: the starting time of the next PRACH slot of the slot where the control information is located. The SSB-RO mapping relationship can be remapped from the next PRACH slot from the minimum SSB index. This is because not all SSB beams in a PRACH slot can be mapped on the RO.

[0178] In a second possible implementation, the effective time of the mapping relationship is: the starting time of the next round of SS / PBCH-PRACH mapping time interval of the slot where the control information is located. The SS / PBCH-PRACH (or also referred to as SSB-PRACH) mapping time interval (SSB-PRACH mapping cycle) is: the time interval required for all SS / PBCH blocks to be completely mapped to RO once.

[0179] In a third possible implementation, the effective time of the mapping relationship is: the starting time of the next PRACH association period of the slot where the control information is located. The PRACH association period (PRACH association period) is: the minimum integer multiple of the PRACH configuration period, so that each SS / PBCH block actually transmitted by the network device can be mapped to the RO at least once. The PRACH configuration period (PRACH configuration period) is: the period of a round of RO distribution on time-frequency resources according to a certain rule.

[0180] In a fourth possible implementation, the effective time of the mapping relationship is: the starting time of the next PRACH association pattern period of the slot where the control information is located. The PRACH association pattern period (PRACH association pattern period) is: composed of a plurality of PRACH association periods, and is a pattern formed by changes in a plurality of PRACH association periods.

[0181] Exemplarily, refer to FIG. 10, which shows a schematic diagram of the mapping relationship provided by the embodiment of the application.

[0182] In a fifth possible implementation, the effective time of the mapping relationship is: the starting time of the slot where the SS / PBCH block associated with the second beam set is located. Or, the effective time of the mapping relationship is the effective time of the second beam set. In some examples, there is a time interval between the time of receiving the control information and the effective time of the second beam set, and there may be a valid RO in the time interval. At this time, the second beam set has not yet taken effect, and the terminal device can continue to use the mapping relationship before adjustment in this time interval. After the second beam set takes effect, the terminal device uses the mapping relationship between the new second beam set and the RO.

[0183] It should be noted that the starting moment of the time slot where the second beam set associated SS / PBCH block is located can also be replaced by the starting moment of the next PRACH time slot of the first beam set associated SS / PBCH block, or the starting moment of the next SS / PBCH-PRACH mapping time interval, or the starting moment of the next PRACH associated period, or the starting moment of the next PRACH associated pattern period.

[0184] Based on the technical solution, in the case that the beam set associated with the SSB burst set is changed from the first beam set to the second beam set, the terminal device can determine the mapping relationship between the RO and the second beam set, instead of still using the mapping relationship between the first beam set and the RO. The technical solution proposes a determination mechanism for timely updating the SSB-RO mapping relationship, and can realize reliable transmission of PRACH.

[0185] It should be noted that the embodiment shown in FIG. 6 and the embodiment shown in FIG. 9 can be implemented alone or in combination. When the two are implemented in combination, the first information in FIG. 6 and the control information in FIG. 9 can be the same information.

[0186] The above, in combination with FIGS. 6 to 10, details the method provided by the embodiments of the application. In the following, the device provided by the embodiments of the application is described in detail in combination with FIGS. 11 to 13. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, therefore, the content not described in detail can be referred to the method embodiment described above, and for brevity, will not be described here.

[0187] Referring to FIG. 11, as an example, FIG. 11 is a schematic diagram of a communication device 1100 provided by an embodiment of the application. The communication device 1100 includes a transceiver unit 1110. The transceiver unit 1110 can be used to realize the corresponding communication function. The transceiver unit 1110 can also be referred to as a communication interface or a communication unit. Optionally, the communication device 1100 further includes a processing unit 1120. The processing unit 1120 can be used for processing, such as determining which cell group to monitor PDCCH.

[0188] Optionally, the device 1100 can also include a storage unit, which can be used to store instructions and / or data, and the processing unit 1120 can read the instructions and / or data in the storage unit, so that the device realizes the foregoing method embodiments.

[0189] In a first possible design, the apparatus 1100 can be a terminal device in the foregoing embodiments, and the apparatus 1100 can implement the steps or procedures performed by the terminal device in the foregoing method embodiments. In this case, the transceiver 1110 can be configured to perform the operations related to the transceiving (e.g., operations of transmitting and / or receiving data or messages) of the terminal device in the foregoing method embodiments, and the processing unit 1120 can be configured to perform the operations related to the processing (or operations other than the transceiving, e.g., operations other than transmitting and / or receiving data or messages) of the terminal device in the foregoing method embodiments.

[0190] In a possible implementation, the transceiver 1110 is configured to receive first information, the first information indicating that a configuration of a synchronization signal physical broadcast channel (SS / PBCH) block is changed from a first configuration to a second configuration, and the processing unit 1120 is configured to determine a valid random access channel occasion (RO) based on the second configuration.

[0191] Optionally, the configuration of the SS / PBCH block includes one or more of the following: a periodicity of a synchronization signal block (SSB) burst set to which the SS / PBCH block corresponds, a set of beams associated with the SSB burst set to which the SS / PBCH block corresponds, or a transmission state of the SSB burst set.

[0192] Optionally, the valid RO is determined based on a time at which the first information is received, or the valid RO is determined based on a time at which the second configuration takes effect.

[0193] Optionally, the time at which the valid RO takes effect is a start time of a next physical random access channel (PRACH) slot of a slot in which the first information is located, or a start time of a slot in which the SS / PBCH of the second configuration is located.

[0194] Optionally, the first information is carried in a downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

[0195] In another possible implementation, the transceiver 1110 is configured to receive control information, the control information indicating that a set of beams associated with a synchronization signal block (SSB) burst set to which a synchronization signal physical broadcast channel (SS / PBCH) block corresponds is changed from a first set of beams to a second set of beams, and the processing unit 1120 is configured to determine a mapping relationship between the second set of beams and a valid random access channel occasion (RO) based on the control information.

[0196] Optionally, the mapping relationship takes effect based on a time at which the control information is received, or the mapping relationship takes effect based on a time at which the second set of beams takes effect.

[0197] Optionally, the mapping relationship is valid at: a start moment of a next physical random access channel (PRACH) slot of a slot where the control information is located; or a start moment of a next round of SS / PBCH-PRACH mapping time intervals of the slot where the control information is located; or a start moment of a next PRACH association period of the slot where the control information is located; or a start moment of a next PRACH association pattern period of the slot where the control information is located; or a start moment of a slot where a SS / PBCH block associated with the second beam set is located.

[0198] Optionally, the control information is carried in a downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

[0199] In a second possible design, the apparatus 1100 can be a network device in the foregoing embodiments, and the apparatus 1100 can implement steps or procedures corresponding to steps or procedures performed by the network device in the foregoing method embodiments. The transceiver 1110 can be configured to perform operations related to transceiving (e.g., operations of transmitting and / or receiving data or messages) of the network device in the foregoing method embodiments, and the processing unit 1120 can be configured to perform operations related to processing of the network device in the foregoing method embodiments, or operations other than transceiving (e.g., operations other than transmitting and / or receiving data or messages).

[0200] In a possible implementation, the transceiver 1110 is configured to transmit first information, the first information indicating that a configuration of a synchronization signal physical broadcast channel (SS / PBCH) block is changed from a first configuration to a second configuration, and the second configuration is further used to determine a valid random access channel occasion (RO).

[0201] In another possible implementation, the transceiver 1110 is configured to transmit control information, the control information indicating that a beam set associated with a SS / PBCH block burst set corresponding to a SS / PBCH block is changed from a first beam set to a second beam set, and the control information is further used to determine a mapping relationship between the second beam set and a valid random access channel occasion (RO).

[0202] It should be understood that the specific processes by which the units perform the corresponding steps described above have been described in detail in the foregoing method embodiments, and thus will not be described again here for brevity.

[0203] It should also be understood that the apparatus 1100 is embodied in the form of a functional block diagram. The terminology used herein, such as "unit", can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (for example, a shared processor, a dedicated processor, or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combination of logic circuitry and / or other suitable components that support the described functions. In an alternative example, those skilled in the art can understand that the apparatus 1100 can be embodied in the communication device in the above-mentioned embodiments, and can be used to execute the processes and / or steps corresponding to the communication device in the above-mentioned method embodiments. To avoid repetition, details are not described here.

[0204] The apparatus 1100 of each of the above-mentioned schemes has a function of implementing the corresponding steps performed by the communication device (such as a terminal device, and such as a network device) in the above-mentioned methods. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor, which respectively performs the transceiving operations and related processing operations in each of the method embodiments.

[0205] In addition, the above-mentioned transceiver unit 1110 can also be a transceiver circuit (for example, which can include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit.

[0206] It should be noted that the apparatus in FIG. 11 can be a communication device (such as a terminal device, and such as a network device) in the above-mentioned embodiments, or a chip or a chip system, for example, a system on chip (SoC). Among them, the transceiver unit can be an input / output circuit, a communication interface; the processing unit is a processor or microprocessor or integrated circuit integrated on the chip. Not limited here.

[0207] Referring to FIG. 12, as an example, FIG. 12 is a schematic diagram of another communication apparatus 1200 provided by the embodiments of the present application. The apparatus 1200 includes a processor 1210, and the processor 1210 is coupled with a memory 1220, the memory 1220 is used to store computer programs or instructions and / or data, and the processor 1210 is used to execute the computer programs or instructions stored in the memory 1220, or read the data stored in the memory 1220, to execute the methods in the above-mentioned method embodiments.

[0208] Optionally, the processor 1210 is one or more.

[0209] Optionally, the memory 1220 is one or more.

[0210] Optionally, the memory 1220 is integrated with the processor 1210, or is separately arranged.

[0211] Optionally, as shown in FIG. 12, the apparatus 1200 further includes a transceiver 1230 for receiving and / or sending signals. For example, the processor 1210 is configured to control the transceiver 1230 to receive and / or send signals.

[0212] For example, the processor 1210 can have the functions of the processing unit 1120 shown in FIG. 11, the memory 1220 can have the functions of a storage unit, and the transceiver 1230 can have the functions of the transceiving unit 1110 shown in FIG. 11.

[0213] As an example, the apparatus 1200 is configured to implement operations performed by a communication apparatus (e.g., a terminal device, or a network device) in each of the method embodiments.

[0214] For example, the processor 1210 is configured to execute computer programs or instructions stored in the memory 1220 to implement the related operations of the communication apparatus in each of the method embodiments.

[0215] It should be understood that the processor mentioned in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0216] It should also be understood that the memory referred to in the embodiments of the application can be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM). For example, the RAM can be used as an external cache. As an example but not limitation, the RAM includes the following various forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).

[0217] It should be noted that when the processor is a general processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated in the processor.

[0218] It should also be noted that the memory described herein is intended to include, but not limited to, these and any other suitable types of memory.

[0219] Referring to FIG. 13, as an example, FIG. 13 is a schematic diagram of a chip system 1300 provided by an embodiment of the application. The chip system 1300 (or also can be called a processing system) includes a logic circuit 1310 and an input / output interface 1320.

[0220] The logic circuit 1310 can be a processing circuit in the chip system 1300. The logic circuit 1310 can be coupled to a storage unit, invoke instructions in the storage unit, so that the chip system 1300 can implement the methods and functions of the embodiments of the present application. The input / output interface 1320 can be an input / output circuit in the chip system 1300, output the information processed by the chip system 1300, or input the data or signaling information to be processed into the chip system 1300 for processing.

[0221] As an option, the chip system 1300 is configured to implement the operations performed by the communication apparatus (e.g., the terminal device, or the network device) in the above various method embodiments.

[0222] For example, the logic circuit 1310 is configured to implement the processing-related operations performed by the communication apparatus (e.g., the terminal device, or the network device) in the above method embodiments; and the input / output interface 1320 is configured to implement the sending and / or receiving-related operations performed by the communication apparatus (e.g., the terminal device, or the network device) in the above method embodiments.

[0223] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program or instructions for implementing the method performed by the communication apparatus (e.g., the terminal device, or the network device) in the above various method embodiments. For example, the computer program or instructions, when running on the communication apparatus, enable the communication apparatus (e.g., the terminal device, or the network device) to perform the above method (e.g., the method 400 or the method 800).

[0224] The embodiments of the present application also provide a computer program product containing instructions, which, when executed by a computer, implement the method performed by the communication apparatus (e.g., the terminal device, or the network device) in the above various method embodiments. For example, when the computer program or instructions run on the communication apparatus, the communication apparatus (e.g., the terminal device, or the network device) performs the above method (e.g., the method 400 or the method 800).

[0225] The embodiments of the present application also provide a communication system, which includes the terminal device and / or the network device in the above embodiments. For example, the system includes the terminal device and the network device in the embodiment of FIG. 6. For another example, the system includes the terminal device and the network device in the embodiment of FIG. 9.

[0226] The explanations and beneficial effects of the related contents in any of the above apparatuses can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0227] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. For example, the apparatus embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, apparatuses or units, and can be electrical, mechanical or other forms.

[0228] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. For example, the computer can be a personal computer, a server or a network device. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as DVD), or semiconductor media (such as solid state disk (SSD) and the like. For example, the foregoing available media includes but is not limited to: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and various media that can store program codes.

[0229] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: Comprising: receiving first information indicating that a configuration of a synchronization signal physical broadcast channel, SS / PBCH, block is changed from a first configuration to a second configuration; determining a valid random access channel occasion, RO, based on the second configuration.

2. The method of claim 1, wherein, The configuration of the SS / PBCH block comprises one or more of: a periodicity of a synchronization signal block, SSB, burst set corresponding to the SS / PBCH block, a set of beams associated with an SSB burst set corresponding to the SS / PBCH block, and a transmission status of an SSB burst set corresponding to the SS / PBCH block.

3. The method of claim 1 or 2, wherein, The validity time of the valid RO is determined based on a time of receiving the first information, or the validity time of the valid RO is determined based on a validity time of the second configuration.

4. The method of any one of claims 1 to 3, wherein, The validity time of the valid RO is: a start time of a next physical random access channel, PRACH, slot of a slot in which the first information is located; or a start time of a slot in which a SS / PBCH block of the second configuration is located.

5. The method of any one of claims 1 to 4, wherein, The first information is carried in a downlink control information, DCI, and / or a medium access control-control element, MAC-CE.

6. A communication method characterized by comprising: Comprising: receiving control information indicating that a set of beams associated with a synchronization signal physical broadcast channel, SS / PBCH, block burst set is changed from a first set of beams to a second set of beams; determining a mapping relationship between the second set of beams and a random access channel occasion, RO, based on the control information.

7. The method of claim 6, wherein, The validity time of the mapping relationship is determined based on a time of receiving the control information, or the validity time of the mapping relationship is determined based on a validity time of the second set of beams.

8. The method of claim 6 or 7, wherein, The validity time of the mapping relationship is: a start time of a next physical random access channel, PRACH, slot of a slot in which the control information is located; or a start time of a next round of SS / PBCH-PRACH mapping time interval of a slot in which the control information is located; or a start time of a next PRACH association period of a slot in which the control information is located; or a start time of a next PRACH association pattern period of a slot in which the control information is located; or a start time of a slot in which a SS / PBCH block associated with the second set of beams is located.

9. The method of any one of claims 6 to 8, wherein, The control information is carried in a downlink control information, DCI, and / or a medium access control-control element, MAC-CE.

10. A communication method characterized by comprising: Comprising: sending first information indicating that a configuration of a synchronization signal physical broadcast channel, SS / PBCH, block is changed from a first configuration to a second configuration, wherein the second configuration is also used to determine a valid random access channel occasion, RO.

11. The method of claim 10, wherein, The configuration of the SS / PBCH block comprises one or more of: a periodicity of a synchronization signal block, SSB, burst set corresponding to the SS / PBCH block, a set of beams associated with an SSB burst set corresponding to the SS / PBCH block, and a transmission status of an SSB burst set corresponding to the SS / PBCH block.

12. The method of claim 10 or 11, wherein, The validity time of the valid RO is determined based on a time of receiving the first information, or the validity time of the valid RO is determined based on a validity time of the second configuration.

13. The method of any one of claims 10 to 12, wherein, The effective moment of the effective RO is: The starting moment of the next physical random access channel (PRACH) slot of the slot where the first information is located; or The starting moment of the slot where the second configured SS / PBCH block is located.

14. The method of any one of claims 10 to 13, wherein, The first information is carried in downlink control information (DCI) and / or a medium access control-control element (MAC-CE).

15. A method of communication, comprising: Comprise: transmit control information, the control information indicating that the beam set associated with the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / PBCH) block burst set corresponding to the synchronization signal physical broadcast channel (SS / 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The method of claim 15, wherein, ​ 17. The method of claim 15 or 16, wherein, ​ ​ ​ ​ ​ ​ 18. The method of any one of claims 15 to 17, wherein, ​ 19. A communications device, characterized by ​ 20. A communications device, characterized by ​ 21. A computer-readable storage medium, characterized in that, ​ 22. A computer program product, characterised in that, The computer program product comprises computer programs or instructions which, when run on a communication device, cause the communication device to perform the method of any one of claims 1 to 5; or cause the communication device to perform the method of any one of claims 6 to 9; or cause the communication device to perform the method of any one of claims 10 to 14; or cause the communication device to perform the method of any one of claims 15 to 18.

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