Wireless communication method and device

Abstract

The embodiment of the present application provides a wireless communication method and device, which can improve flexibility in paging or sending broadcast messages. The method includes: a network device determines a method for paging or sending a broadcast message to a terminal device, and the determined method is one of a first method and a second method; wherein, in the first method, a first parameter set is used for paging or sending a broadcast message at a specific frequency point, and in the second method, a second parameter set is used for paging or sending a broadcast message at a specific frequency point; according to the determined method, at the specific frequency point, the network device pages the terminal device or sends the broadcast message.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a wireless communication method and device. Background Art

[0002] In a Long Term Evolution (LTE) system, a network device and a terminal device may determine a paging timing at which the network device pages the terminal device within a paging cycle.

[0003] In future New Radio (NR) systems, higher communication flexibility is required.

[0004] How to improve flexibility in paging or other message sending is an urgent problem to be solved. Summary of the invention

[0005] The present application provides a wireless communication method and device, which can improve flexibility in paging or sending broadcast messages.

[0006] In a first aspect, a wireless communication method is provided, comprising:

[0007] The network device determines a method for paging or sending a broadcast message to the terminal device, where the determined method is one of a first method and a second method;

[0008] Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency;

[0009] According to the determined method, at the specific frequency point, the network device pages the terminal device or sends the broadcast message.

[0010] Therefore, in an embodiment of the present application, there is a first method corresponding to the first parameter set and a second method corresponding to the second parameter set that can be used for network devices to perform paging or send broadcast messages, which can enhance the flexibility of the network device to paging or send broadcast messages to terminal devices.

[0011] In combination with the first aspect, in a possible implementation manner of the first aspect, before the network device determines a manner of paging or sending a broadcast message to the terminal device, the method further includes:

[0012] The network device determines a paging opportunity for paging the terminal device;

[0013] The network device determines a method for paging or sending a broadcast message to a terminal device, including: the network device determines a method for paging the terminal device at the paging opportunity.

[0014] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the first parameter set and the second parameter set respectively include at least one of the time position, time length, subcarrier spacing and interval between time positions required for paging or sending the broadcast message.

[0015] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, the network device paging or sending the broadcast message to the terminal device includes:

[0016] At the time position, a PDCCH and / or a PDSCH for paging is sent.

[0017] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, each time position corresponds to a single beam scan.

[0018] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the first parameter set refers to the parameter set used for actually sending the synchronization signal block; and the second parameter set does not refer to the parameter set used for actually sending the synchronization signal block.

[0019] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the method further includes:

[0020] The network device sends first information to the terminal device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

[0021] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

[0022] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the network device determines a manner of paging or sending a broadcast message to the terminal device, including:

[0023] According to the current paging opportunity or the time period for sending the broadcast message, the network device determines the way of performing paging or sending the broadcast message to the terminal device.

[0024] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the method further includes:

[0025] The network device sends second information to the terminal device, where the second information is used to notify the association between the method of performing paging or sending the broadcast message and the time period.

[0026] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

[0027] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the network device determines a manner of paging or sending a broadcast message to the terminal device, including:

[0028] The method of performing paging or sending a broadcast message is determined according to whether a synchronization signal block is sent or a candidate sending time position of a synchronization signal block is sent within the time range of performing paging or sending a broadcast message.

[0029] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, determining a manner of performing paging or sending a broadcast message according to whether a synchronization signal block or a candidate sending time position with a synchronization signal block is sent within a time range for performing paging or sending a broadcast message includes:

[0030] Sending a synchronization signal block or a candidate sending time position having a synchronization signal block within a time range for performing paging or sending a broadcast message, and determining that the manner of performing paging or sending a broadcast message is the first manner;

[0031] If no synchronization signal block is sent or there is no candidate sending time position with a synchronization signal block within the time range for performing paging or sending a broadcast message, the method for performing paging or sending a broadcast message is determined to be the second method.

[0032] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, the network device paging or sending a broadcast message to the terminal device at the specific frequency according to the determined method includes:

[0033] When the determined manner is the first manner, at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, of a synchronization signal block actually sent at the specific frequency point is determined as at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, required for performing paging or sending a broadcast message at the specific frequency point;

[0034] According to at least one of the determined time length, time position, subcarrier spacing and interval between time positions, paging or sending a broadcast message to the terminal device at the specific frequency point.

[0035] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, paging or sending a broadcast message to the terminal device at the specific frequency point according to the determined time length and / or position includes:

[0036] At the specific frequency point, the same beam parameter setting as that for sending the synchronization signal block is used to page the terminal device or send a broadcast message.

[0037] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the network device paging or sending a broadcast message to the terminal device according to the determined method includes:

[0038] When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N consecutive time positions at the specific frequency point.

[0039] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0040] In combination with the first aspect or any of the foregoing possible implementations, in another possible implementation of the first aspect, the network device paging or sending a broadcast message to the terminal device according to the determined method includes:

[0041] When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N time positions, and at least two adjacent time positions among the N time positions are discontinuous.

[0042] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, the N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

[0043] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, in each time slot, the starting points of the T time positions are the Sth symbol of each time slot, where S is an integer greater than or equal to 1.

[0044] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, in each time slot, the end point of the T time positions is the Pth last symbol of each time slot, where P is an integer greater than or equal to 1.

[0045] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, when T is greater than 1, any two time positions of the T time positions are discontinuous.

[0046] In combination with the first aspect or any one of the foregoing possible implementations, in another possible implementation of the first aspect, when T is greater than 1, there are at least two consecutive time positions among the T time positions.

[0047] In combination with the first aspect or any one of the above possible implementations, in another possible implementation of the first aspect, in the same time slot, the at least two consecutive time positions are separated from the at least two adjacent consecutive time positions by at least one symbol.

[0048] In a second aspect, a wireless communication method is provided, including:

[0049] The terminal device determines a mode in which the network device pages the terminal device or sends a broadcast message, where the determined mode is one of a first mode and a second mode;

[0050] Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency;

[0051] According to the determined method, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

[0052] Therefore, in an embodiment of the present application, there is a first method corresponding to the first parameter set and a second method corresponding to the second parameter set that can be used for network devices to perform paging or send broadcast messages, which can enhance the flexibility of the network device to paging or send broadcast messages to terminal devices.

[0053] In conjunction with the second aspect, in a possible implementation manner of the second aspect, before the terminal device determines a manner in which the network device pages the terminal device or sends a broadcast message, the method further includes:

[0054] The terminal device determines a paging timing for the network device to page the terminal device;

[0055] The terminal device determines the manner in which the network device pages the terminal device or sends a broadcast message, including: the terminal device determines the manner in which the network device pages the terminal device within the paging opportunity.

[0056] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, the first parameter set and the second parameter set respectively include at least one of the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message.

[0057] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including:

[0058] At the time position, the terminal device monitors the PDCCH and / or PDSCH used for paging.

[0059] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, the first parameter set refers to the parameter set used for actually sending the synchronization signal block; the second parameter set does not refer to the parameter set used for actually sending the synchronization signal block.

[0060] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the method further includes:

[0061] The terminal device receives first information sent by the terminal device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

[0062] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, the first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

[0063] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the terminal device determines a manner in which a network device pages the terminal device or sends a broadcast message, including:

[0064] According to the current paging opportunity for paging or the time period for sending a broadcast message, the terminal device determines the manner in which the network device pages the terminal device or sends a broadcast message.

[0065] In combination with the second aspect or any of the above possible implementations, in another possible implementation of the second aspect, the method further includes: the terminal device receives second information sent by the network device, where the second information is used to notify an association between a method of performing paging or sending a broadcast message and a time period; or

[0066] The association between the manner in which the network device performs paging or broadcasting to the terminal device and the time period is preset on the terminal device.

[0067] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, the second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

[0068] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the terminal device determines a manner in which a network device pages the terminal device or sends a broadcast message, including:

[0069] According to whether a synchronization signal block or a candidate sending time position of a synchronization signal block is sent within a time range in which the network device paging or sending a broadcast message to the terminal device, the terminal device determines the manner in which the network device pages or sends a broadcast message to the terminal device.

[0070] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, according to whether a synchronization signal block or a candidate sending time position with a synchronization signal block is sent within a time range in which the network device paging or sending a broadcast message to the terminal device, the terminal device determines a manner in which the network device pages or sends a broadcast message to the terminal device, including:

[0071] Determine, within the time range in which the network device performs paging or broadcast message transmission to the terminal device, a candidate transmission time position in which the network device transmits a synchronization signal block or has a synchronization signal block, and determine that the mode of performing paging or sending a broadcast message is the first mode;

[0072] Within the time range in which the network device pages or sends a broadcast message to the terminal device, determine a candidate sending time position in which the network device does not send a synchronization signal block or does not have a synchronization signal block, and determine that the method for paging or sending a broadcast message is the second method.

[0073] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including:

[0074] When the determined manner is the first manner, at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for actually sending the synchronization signal block by the network device at the specific frequency point is determined as at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for the network device to page the terminal device or send a broadcast message at the specific frequency point;

[0075] According to the determined time length, time position and / or subcarrier spacing, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

[0076] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including:

[0077] When the determined mode is the second mode, at the specific frequency point, at N consecutive time positions, the paging or broadcast message sent by the network device to the terminal device is monitored.

[0078] In combination with the second aspect or any possible implementation method above, in another possible implementation method of the second aspect, the N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0079] In combination with the second aspect or any of the foregoing possible implementations, in another possible implementation of the second aspect, the method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including:

[0080] When the determined method is the second method, at N time positions, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device, and there are at least two adjacent time positions among the N time positions that are discontinuous.

[0081] In combination with the second aspect or any possible implementation method above, in another possible implementation method of the second aspect, the N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

[0082] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, in each time slot, the starting points of the T time positions are the Sth symbol of each time slot, where S is an integer greater than or equal to 1.

[0083] In combination with the second aspect or any one of the above possible implementations, in another possible implementation of the second aspect, in each time slot, the end point of the T time positions is the Pth last symbol of each time slot, where P is an integer greater than or equal to 1.

[0084] In combination with the second aspect or any one of the foregoing possible implementations, in another possible implementation of the second aspect, when T is greater than 1, any two time positions of the T time positions are discontinuous.

[0085] In combination with the second aspect or any one of the foregoing possible implementations, in another possible implementation of the second aspect, when T is greater than 1, there are at least two consecutive time positions among the T time positions.

[0086] In combination with the second aspect or any one of the foregoing possible implementations, in another possible implementation of the second aspect, the at least two consecutive time positions are separated from the at least two adjacent consecutive time positions by at least one symbol.

[0087] In a third aspect, a network device is provided, which is used to execute the method in the first aspect or any possible implementation of the first aspect. Specifically, the network device includes a functional module for executing the method in the first aspect or any possible implementation of the first aspect.

[0088] In a fourth aspect, a terminal device is provided, which is used to execute the method in the second aspect or any possible implementation of the second aspect. Specifically, the terminal device includes a functional module for executing the method in the second aspect or any possible implementation of the second aspect.

[0089] In a fifth aspect, a network device is provided, comprising a processor, a memory, and a transceiver. The processor, the memory, and the transceiver communicate with each other through an internal connection path to transmit control and / or data signals, so that the network device executes the method in the first aspect or any possible implementation of the first aspect.

[0090] In a sixth aspect, a terminal device is provided, comprising a processor, a memory, and a transceiver. The processor, the memory, and the transceiver communicate with each other through an internal connection path to transmit control and / or data signals, so that the terminal device executes the method in the second aspect or any possible implementation of the second aspect.

[0091] In a seventh aspect, a computer-readable medium is provided for storing a computer program, wherein the computer program includes instructions for executing any one of the above methods or any possible implementations.

[0092] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute any one of the above methods or any possible implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0094] Figure 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application.

[0095] Figure 2 It is a schematic flowchart of a wireless communication method according to an embodiment of the present application.

[0096] Figure 3 This is a time slot distribution diagram of the synchronization signal block according to an embodiment of the present application.

[0097] Figure 4 This is a distribution diagram of synchronization signal blocks within a time slot according to an embodiment of the present application.

[0098] Figure 5 It is a schematic relationship diagram of the candidate positions of the synchronization signal block and the possible positions of the paging or broadcast message according to an embodiment of the present application.

[0099] Figure 6 It is a schematic relationship diagram between the actual sending position of the synchronization signal block and the actual occupied position of the paging or broadcast message according to an embodiment of the present application.

[0100] Figure 7 It is a schematic relationship diagram between the actual sending position of the synchronization signal block and the actual occupied position of the paging or broadcast message according to an embodiment of the present application.

[0101] Figure 8 It is a schematic diagram of an unknown time for paging or sending a broadcast message according to an embodiment of the present application.

[0102] Fig. 9 It is a schematic block diagram of a network device according to an embodiment of the present application.

[0103] Fig.10 It is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0104] Fig.11 is a schematic block diagram of a system chip according to an embodiment of the present application.

[0105] Fig.12 It is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0106] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0107] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or future 5G system.

[0108] Figure 1 A wireless communication system 100 applied in an embodiment of the present application is shown. The wireless communication system 100 may include a network device 110. The network device 100 may be a device that communicates with a terminal device. The network device 100 may provide communication coverage for a specific geographical area, and may communicate with a terminal device (e.g., UE) located in the coverage area. Optionally, the network device 100 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (EvolutionalNode B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network-side device in a future 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

[0109] The wireless communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. The terminal device 120 may be mobile or fixed. Optionally, the terminal device 120 may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolved PLMN, etc.

[0110] Optionally, terminal devices 120 may perform device-to-device (D2D) communication with each other.

[0111] Optionally, the 5G system or network may also be referred to as a New Radio (NR) system or network.

[0112] Figure 1 One network device and two terminal devices are shown exemplarily. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include another number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0113] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0114] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0115] Figure 2 is a schematic flow chart of a wireless communication method 200 according to an embodiment of the present application. The method 200 may optionally be applied to Figure 1 The system shown is not limited thereto. The method 200 includes at least part of the following contents.

[0116] In 210, the network device determines a method for paging or sending a broadcast message to the terminal device, and the determined method is one of a first method and a second method; wherein, in the first method, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second method, a second parameter set is used for paging or sending a broadcast message at a specific frequency.

[0117] Specifically, the network device can select a method for paging or sending a broadcast message to the terminal device from a first method and a second method, wherein the purpose of selecting the method for paging or sending a broadcast message is to determine a parameter set used for paging or sending a broadcast message to the terminal device, and the network device can page or send a broadcast message to the terminal device according to the parameter set corresponding to the selected method.

[0118] Optionally, the first parameter set corresponding to the first mode and the second parameter set corresponding to the second mode may include the same parameter type, but the value of at least one type of parameter may be different. Specifically, the value of at least one of the time position, time length, subcarrier spacing, and interval between time positions may be different.

[0119] For example, the length of the time position corresponding to the first parameter set is different from the length of the time position corresponding to the second parameter set. The length of the time position corresponding to the first parameter set is 4 symbols, and the length of the time position corresponding to the second parameter set is 2 symbols.

[0120] For example, the number of time positions corresponding to the first parameter set and the number of time positions corresponding to the second parameter set are: the number of time positions corresponding to the first parameter set is 2, and the number of time positions corresponding to the second parameter set is 4.

[0121] For example, the length of the time position corresponding to the first parameter set is different from the subcarrier spacing corresponding to the second parameter set. The subcarrier spacing corresponding to the first parameter set is 30KHZ, and the subcarrier spacing corresponding to the second parameter set is 15KHZ.

[0122] Alternatively, the first parameter set corresponding to the first mode and the second parameter set corresponding to the second mode may include the same parameter types and the same parameter values.

[0123] Optionally, the first parameter set and the second parameter set respectively include at least one of a time position, a time length, a subcarrier spacing, and an interval between time positions required for performing paging or sending a broadcast message.

[0124] Optionally, the time position mentioned in the embodiment of the present application may include at least one symbol, and when it includes multiple symbols, the multiple symbols may be continuous.

[0125] Optionally, each time position corresponds to a single beam scan, and different time positions of a paging or broadcast message may correspond to different beams.

[0126] Optionally, the network device paging the terminal device may mean sending a physical downlink control channel (PDCCH) and / or a physical downlink shared channel (PDSCH) for paging at a corresponding time position.

[0127] Optionally, the broadcast message mentioned in the embodiment of the present application may refer to carrying RMSI, OSI or on-demand system information.

[0128] Optionally, when performing paging, a time position mentioned in an embodiment of the present application can be used to carry frequency-division multiplexed PDSCH and PDCCH, or, different symbols at a time position are used to carry PDSCH and PDCCH respectively, or, a time position is only used to carry PDCCH or PDSCH, or, PDSCH occupies multiple symbols at a time position, and PDCCH is frequency-division multiplexed with PDSCH in at least some of the multiple symbols.

[0129] Optionally, the time length mentioned in the embodiment of the present application can be represented by the number of symbols. The time length mentioned in the present application can be the time length occupied by a single beam scan, or it can be the time length occupied by a complete beam scan (including multiple beams).

[0130] Optionally, the interval between the time positions mentioned in the embodiments of the present application may be the interval between the center symbols of the two time positions, or may be the interval between the first symbols of the two time positions, the interval between the last symbols of the two time positions, or the interval between the last symbol of the previous time position and the first symbol of the next time position.

[0131] Optionally, corresponding to a downlink beam (or a time position), the time length of paging or sending a broadcast message can be 2, 4, 7 symbols or the time length corresponding to a time slot.

[0132] Optionally, the first parameter set and the second parameter set may have different values ​​for at least one of the time position, time length, subcarrier spacing and time position interval respectively.

[0133] It should be understood that the first parameter set and the second parameter set may also include other parameters in addition to at least one of the time position, time length, subcarrier spacing and time position interval, and the embodiments of the present application do not specifically limit this.

[0134] Optionally, the specific frequency mentioned in the embodiment of the present application may be a frequency for communicating with a terminal device.

[0135] Optionally, in an embodiment of the present application, for different frequency points, parameter values ​​of the first parameter set and / or the second parameter set may be different.

[0136] Optionally, the first parameter set refers to a parameter set used to actually send the synchronization signal block.

[0137] Optionally, the second parameter set does not refer to a parameter set used to actually send the synchronization signal block.

[0138] It should be understood that although the second parameter set does not refer to the parameter set actually used to send the synchronization signal block, it does not mean that the parameter values ​​of the second parameter set and the first parameter set must be different. The second parameter set does not refer to the parameter set actually used by the synchronization signal block, which only means that when the network device or terminal device obtains the second parameter set or presets the second parameter set, the factor of sending the synchronization signal block is not considered, but other factors may be considered, which happens to make the parameter values ​​of the first parameter set the same as the parameter values ​​of the second parameter set.

[0139] For ease of understanding, the sending of the synchronization signal block is described in detail below.

[0140] The synchronous signal block (SS Block or SSB) is transmitted periodically. Within the SSBlock period, the SS burst set of a specific frequency point can be limited to a time window of 5ms. The maximum number of SS Blocks is L, where

[0141] For the frequency range within 3 GHz, L = 4.

[0142] For the frequency range from 3 GHz to 6 GHz, L = 8,

[0143] Corresponding to the frequency domain range of 6 GHz to 52.6 GHz, L=64.

[0144] In the 5ms time window, for different subcarrier spacings and different operating frequency bands, the time slot distribution of SSBlock can be as follows: Figure 2 shown.

[0145] in, Figure 3 The first row shows the time slot distribution of SS Block when the subcarrier spacing is 15KHZ and L=4. Figure 3 The second row shows the time slot distribution of SS Block when the subcarrier spacing is 15KHZ and L=8. Figure 3 The third row shows the time slot distribution of SS Block when the subcarrier spacing is 30KHZ and L=4. Figure 3 The fourth row shows the time slot distribution of SS Block when the subcarrier spacing is 30KHZ and L=8. Figure 3 The fifth row shows the time slot distribution of SS Block when the subcarrier spacing is 240KHZ and L=64.

[0146] Figure 4 The pattern distribution within one time slot of 15KHZ, 30KHZ, 120KHZ and 240KZ is shown.

[0147] like Figure 4 As shown, in the case of 15KHZ and 30KZH, at least 1 or 2 symbols are reserved at the beginning of 14 symbols for downlink control, and at least two symbols are reserved at the end for example, a guard interval or uplink control.

[0148] In the case of 120 kHz, at least 2 symbols are reserved at the beginning of 14 symbols for downlink control, and at least two symbols are reserved at the end for example, a guard interval or uplink control.

[0149] In the case of 240KHZ, across two consecutive time slots, at least 4 symbols are reserved at the beginning of the first time slot for downlink control, and at least 4 symbols are reserved at the end of the second time slot for example, a guard interval or uplink control.

[0150] Optionally, before the network device determines the method for paging the terminal device, the network device determines a paging opportunity for paging the terminal device; the network device determines the method for paging the terminal device at the paging opportunity.

[0151] Optionally, the paging occasion mentioned in the embodiment of the present application may be used to send PDSCH and / or PDCCH.

[0152] If the paging occasion is used to send PDSCH and PDCCH, PDSCH and PDCCH can be sent at the same time position (occupying the same symbol), and at this time, PDSCH and PDCCH can be frequency division multiplexed.

[0153] Alternatively, if the paging occasion is used to send PDSCH and PDCCH, PDSCH can be sent at different time positions. For example, PDCCH can be sent first through multiple beams, and then PDSCH can be sent through multiple beams. For example, PDCCH or PDSCH can be sent once on different symbols through the same or different beams, and then PDCCH and PDSCH can be sent once on other different symbols using the same or different beams, and so on.

[0154] Optionally, when the terminal device monitors paging, the terminal device may attempt to receive a paging message in a specific subframe (called PO) of a specific frame (called PF) within its paging cycle. The paging occasion (Paging Occasion, PO) may be a subframe, on which there may be a PDCCH that is scrambled using a paging radio network temporary identity (Paging RNTI RadioNetwork Temporary Identity, P-RNTI) and indicates a Paging message. When discontinuous reception (DRX) is used, the terminal device may only need to detect one PO in each DRX cycle, that is, for each terminal device, only one subframe may be used to send Paging in each Paging cycle. The DRX cycle may be the same as the Paging cycle. A paging frame (Paging Frame, PF) may be a radio frame that may contain one or more POs.

[0155] It should be understood that the paging occasion introduced above is only a specific implementation of the present application, and in order to facilitate the understanding of the present application, it should not constitute a special limitation on the scope of the present application.

[0156] In 220, according to the determined method, the network device pages or sends a broadcast message to the terminal device at the specific frequency.

[0157] In 230, the terminal device determines a method in which the network device pages the terminal device or sends a broadcast message, and the determined method is one of a first method and a second method.

[0158] Optionally, the terminal device determines a paging occasion for the network device to page the terminal device; the terminal device determines a manner in which the network device pages the terminal device within the paging occasion.

[0159] In 240, according to the determined method, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

[0160] Optionally, in a determined manner and at a corresponding time position, the terminal device monitors the PDCCH and / or PDSCH used for paging.

[0161] Optionally, the network device sends first information to the terminal device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

[0162] Accordingly, the terminal device can receive the first information sent by the network device. Based on the first information, the terminal device can obtain the way in which the network device pages the terminal device or sends a broadcast message, or obtain the first parameter set and / or the second parameter set.

[0163] Optionally, the first information is carried in remaining minimum system information (Remaining Minimum System Information, RMSI), other system information (Other System Information, OSI), on-demand system information or radio resource control (Radio Resource Control, RRC) message.

[0164] For example, when used for paging, the first information may be carried in a remaining minimum system information (RMSI), other system information (OSI), on-demand system information, or a radio resource control (RRC) message.

[0165] When used for sending a broadcast message, the first information may be carried in remaining minimum system information (Remaining Minimum System Information, RMSI), other system information (Other System Information, OSI), and on-demand system information.

[0166] Optionally, the network device determines the manner of paging or sending a broadcast message to the terminal device according to the current paging opportunity or the time period in which the broadcast message is sent. Correspondingly, the terminal device may also determine the manner of paging or sending a broadcast message to the terminal device according to the current time period in which the network device paging or sending a broadcast message to the terminal device.

[0167] Specifically, the method of paging or sending a broadcast message is related to the paging opportunity or the time period in which the broadcast message is sent. For example, the first method may be used in the first time period, the second method may be used in the second time period adjacent to the first time period, and the first method may be used in the subsequent third time period, and so on.

[0168] Optionally, the network device sends a second message to the terminal device, and the second message is used to notify the association between the mode of paging or sending a broadcast message and the time period. The terminal device can obtain the association between the mode of paging or sending a broadcast message to the terminal device and the time period based on the second message sent by the network device.

[0169] Optionally, the second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

[0170] For example, when used for paging, the second information may be carried in a remaining minimum system information (RMSI), other system information (OSI), on-demand system information, or a radio resource control (RRC) message.

[0171] When used for sending a broadcast message, the second information may be carried in remaining minimum system information (Remaining Minimum System Information, RMSI), other system information (Other System Information, OSI), and on-demand system information.

[0172] Optionally, the association between the manner in which the network device pages the terminal device or sends a broadcast message and the time period can also be preset on the network device and the terminal device respectively, so the network device does not need to send the second information to notify the terminal device of the association.

[0173] Optionally, the network device or terminal device may determine the manner of performing paging or sending a broadcast message based on whether a synchronization signal block or a candidate sending time position of a synchronization signal block is sent within the time range for performing paging or sending a broadcast message.

[0174] Among them, if a synchronization signal block or a candidate sending time position with a synchronization signal block is sent within the time range for paging or sending a broadcast message, the method for determining to perform paging or send a broadcast message is the first method; if a synchronization signal block or a candidate sending time position without a synchronization signal block is not sent within the time range for paging or sending a broadcast message, the method for determining to perform paging or send a broadcast message is the second method.

[0175] Among them, the terminal device determines whether the network device has sent a synchronization signal block within the time range when the network device pages the terminal device or sends a broadcast message. It can be determined based on whether the synchronization signal block is actually detected, or based on the notification message of the network device.

[0176] Optionally, when the determined method is the first method, the network device will determine at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing and the interval of the time position of the synchronization signal block actually sent at the specific frequency point as the time length, at least part of the symbols of the time position, the subcarrier spacing and the time position required for paging or sending a broadcast message at the specific frequency point; and according to at least one of the determined time length, time position, subcarrier spacing and time position, page the terminal device or send a broadcast message at the specific frequency point.

[0177] Among them, at this specific frequency point, the network equipment can use the same beam parameter setting as that for sending the synchronization signal block to page the terminal device or send a broadcast message.

[0178] If SSB multiplexes the beam with paging or broadcast messages, no additional beam scanning cycle is required; when not multiplexed, independent time length, time position or subcarrier spacing is used to better match the load of paging or broadcast messages.

[0179] Of course, the network device may also use a beam parameter device that is different from that used to send the synchronization signal to page the terminal device or send a broadcast message.

[0180] Correspondingly, when the determined method is the first method, the terminal device will determine at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing and the interval of the time position for the network device to actually send the synchronization signal block at the specific frequency point as at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing and the interval of the time position used by the network device to page or send a broadcast message to the terminal device at the specific frequency point; according to the determined time length, time position, subcarrier spacing and / or time position interval, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

[0181] The following description is made by taking the case where the subcarrier spacing is 15 KHz and L=4 as an example.

[0182] Specifically, the location of paging or sending broadcast messages refers to the maximum L = 4 SSB candidate locations. Corresponding to each candidate location, the symbol positions occupied by the possible 2-symbol, 4-symbol or 7-symbol paging messages are as follows: Figure 5 described.

[0183] If the corresponding SSB is transmitted, the corresponding paging message or broadcast message is also transmitted. Otherwise, if the SSB at a certain position is not actually transmitted, the paging message or broadcast message is not transmitted at that position. Figure 6 As shown, the SSB at the 1st and 4th positions are transmitted, and the 1st and 4th positions also page the terminal or send a broadcast message.

[0184] Optionally, when the number of symbols occupied by an actual sending position or candidate sending position of a synchronization signal block is L times the number of symbols occupied by a time position of a broadcast message or a paging message, all the symbols occupied by the time position of the broadcast message or the paging message belong to the symbols occupied by the actual sending position or the candidate sending position of the synchronization signal block, where L is an integer greater than or equal to 1.

[0185] In this implementation, the network device may indicate which actual transmission positions or candidate positions of the synchronization signal block are used for simultaneously transmitting paging or broadcast messages. The indication may be performed in a bit mapping manner. Assuming that the number of actual transmission positions or candidate positions of the synchronization signal block is also N, N*L bits may be used to indicate which symbols may be used for transmitting paging or broadcast messages.

[0186] In addition, if Figure 7As shown, there are 4 available SSB symbols at each available SSB candidate position. When a paging message or a broadcast message is transmitted using 4 symbols, the 4 symbols at the SSB position in the SSB distribution pattern in a time slot can be reused. When a paging message or a broadcast message is transmitted using 2 symbols, the transmission of two paging messages can reuse a group of the 4 symbols available in the pattern.

[0187] Although, Figures 5 to 7 It mainly shows the cases where paging or sending a broadcast message occupies 2 symbols, 4 symbols and 7 symbols, but the paging or sending a broadcast message in the embodiment of the present application can also occupy other numbers of symbols, such as 5 symbols or 6 symbols.

[0188] Optionally, for the SSB pattern of 30KHz, 120KHZ or 240KHZ, due to the limitation of the SSB pattern, adjacent SSB candidate positions have continuous symbols, so there may not be more than 4 symbols for paging transmission or broadcast message sending; the optimal number of symbols for paging transmission or broadcast message is 4.

[0189] Optionally, in the beam corresponding to each SS block, the transmission duration of paging or sending a broadcast message is 2, 4, 7 symbols or the duration corresponding to a slot. Preferably, when the transmission duration of paging or sending a broadcast message is 2 or 4 symbols, the paging or sending a broadcast message is sent within the symbol occupied by the SS Block; and the paging or sending a broadcast message is frequency-division multiplexed with the SS Block.

[0190] Optionally, the duration of paging or sending broadcast messages on all SS Blocks is the same.

[0191] The above has introduced how to page or send a broadcast message to a terminal device when the determined mode is the first mode. The following will introduce how to page or send a broadcast message to a terminal device when the determined mode is the second mode.

[0192] In an implementation manner, when the determined mode is the second mode, paging is performed or broadcast messages are sent at N consecutive time positions at the specific frequency point.

[0193] Optionally, the N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot of the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1. For example, Figure 8 The first row is shown in .

[0194] For example, for paging, from a determined time starting point, the paging messages are arranged continuously according to the duration until the paging messages corresponding to all SSBs are sent. The determined time starting point can be the starting point of the PO slot (that is, the first symbol), or it can be an offset starting symbol position in the slot within the Poslot; the starting point can be pre-agreed between the network and the terminal, or notified by the network to the terminal.

[0195] In another implementation, when the mode is determined to be the second mode, paging or broadcast messages are sent at N time positions, and at least two adjacent time positions among the N time positions are discontinuous. Figure 8 The second to seventh rows are shown in FIG.

[0196] Optionally, the N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

[0197] Optionally, in each time slot, the starting point of the T time positions is the Sth symbol of each time slot, where S is an integer greater than or equal to 1. Figure 6 As shown in the second to seventh rows, where S is greater than 1.

[0198] Optionally, in each time slot, the end point of the T time positions is the Pth last symbol of each time slot, where P is an integer greater than or equal to 1. Figure 6 As shown in the third to seventh rows of , where P is greater than 1.

[0199] Optionally, when T is greater than 1, any two time positions of the T time positions are discontinuous. Figure 8 As shown in the fifth to sixth rows of .

[0200] For example, taking paging as an example, from the starting point of the determined PO, according to the duration of the paging message, K paging messages are transmitted non-continuously starting from the Mth symbol in each slot in the PO, and the interval between two adjacent paging messages can be N symbols; until the paging corresponding to all the actually transmitted SSBs is sent. M can be 1, 2, 3, N can be 1, 2, 3, and K = 1-3.

[0201] Optionally, when T is greater than 1, there are at least two consecutive time positions in the T time positions. Figure 8 The second to fourth rows are shown in FIG.

[0202] For example, taking paging as an example, from the determined PO time starting point, according to the duration of the paging message, K paging message transmissions are arranged continuously starting from the Mth symbol in each slot in the PO; until the paging transmissions corresponding to all the SSBs actually transmitted are completed. Among them, M can be 1, 2, 3, and K = 1-3.

[0203] Optionally, in the same time slot, the at least two consecutive time positions are separated from the at least two adjacent consecutive time positions by at least one symbol. Figure 8 The second to fourth rows are shown in FIG.

[0204] It should be understood that the first parameter set introduced above refers to the parameter set used for actually sending the synchronization signal block, and the second parameter set is not referred to the parameter set used for actually sending the synchronization signal block as an example for description. However, the embodiments of the present application are not limited to this, and both the first parameter set and the second parameter set refer to the parameter set used for actually sending the synchronization signal block.

[0205] For example, the first parameter set and the second parameter set both refer to the parameters used for actually sending different signal blocks for a certain parameter, but the values ​​of the parameter are different. For example, the actual time length of the synchronization signal block actually sent is 4 symbols, and the time position lengths corresponding to the first parameter set and the second parameter set are both less than or equal to 4 symbols, where the time position length corresponding to the first parameter set is 2 symbols, and the time position length corresponding to the second parameter set is 4 symbols.

[0206] For example, the first parameter set and the second parameter set respectively refer to different parameters of the synchronization signal block actually sent. For example, the first parameter set refers to the subcarrier spacing of the synchronization signal block actually sent, and the second parameter set refers to the length of the time position of the synchronization signal block actually sent.

[0207] Therefore, in an embodiment of the present application, there is a first method corresponding to the first parameter set and a second method corresponding to the second parameter set that can be used for network devices to perform paging or send broadcast messages, which can enhance the flexibility of the network device to paging or send broadcast messages to terminal devices.

[0208] Fig. 9 is a schematic block diagram of a network device 300 according to an embodiment of the present application. Fig. 9 As shown, the network device 300 includes a processing unit 310 and a communication unit 320; wherein,

[0209] The processing unit 310 is used to: determine a method for paging or sending a broadcast message to a terminal device, wherein the determined method is one of a first method and a second method;

[0210] Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency;

[0211] The communication unit 320 is used to: perform paging or send the broadcast message to the terminal device at the specific frequency according to the determined method.

[0212] It should be understood that the network device 300 may correspond to the network device in the method embodiment, and may implement the corresponding operations implemented by the network device in the method embodiment, which will not be described in detail here for the sake of brevity.

[0213] Fig.10 4 is a schematic block diagram of a terminal device 400 according to an embodiment of the present application. Fig.10 As shown, the terminal device 400 includes a processing unit 410 and a communication unit 420; wherein,

[0214] The processing unit 410 is used to: determine a mode in which the network device pages the terminal device or sends a broadcast message, wherein the determined mode is one of a first mode and a second mode;

[0215] Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency;

[0216] The communication unit 420 is used to: monitor the paging or broadcast message sent by the network device to the terminal device at the specific frequency point according to the determined method.

[0217] It should be understood that the terminal device 400 can correspond to the terminal device in the method embodiment and can implement the corresponding operations implemented by the terminal device in the method embodiment. For the sake of brevity, it will not be repeated here.

[0218] Fig.11 It is a schematic structural diagram of the system chip 600 according to an embodiment of the present application. Fig.11 The system chip 600 includes an input interface 601 , an output interface 602 , and the processor 603 and the memory 604 can be connected via an internal communication connection line. The processor 603 is used to execute the code in the memory 604 .

[0219] Optionally, when the code is executed, the processor 603 implements the method executed by the network device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0220] Optionally, when the code is executed, the processor 603 implements the method executed by the terminal device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0221] Fig.12 is a schematic block diagram of a communication device 700 according to an embodiment of the present application. Fig.12 As shown, the communication device 700 includes a processor 710 and a memory 720. The memory 720 may store program codes, and the processor 710 may execute the program codes stored in the memory 720.

[0222] Alternatively, if Fig.12 As shown, the communication device 700 may include a transceiver 730, and the processor 710 may control the transceiver 730 to communicate externally.

[0223] Optionally, the processor 710 may call program codes stored in the memory 720 to execute corresponding operations of the network device in the method embodiment, which will not be described in detail here for the sake of brevity.

[0224] Optionally, the processor 710 may call program codes stored in the memory 720 to execute corresponding operations of the terminal device in the method embodiment, which will not be described in detail here for the sake of brevity.

[0225] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0226] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. 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 erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0227] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0228] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0229] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0230] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0231] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0232] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0233] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless communication method, characterized in that: include: The network device determines a method for paging or sending a broadcast message to the terminal device, where the determined method is one of a first method and a second method; Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency; wherein the first parameter set refers to a parameter set used for actually sending a synchronization signal block, and the second parameter set does not refer to a parameter set used for actually sending a synchronization signal block; According to the determined method, at the specific frequency point, the network device pages the terminal device or sends the broadcast message.

2. The method according to claim 1, characterized in that Before the network device determines a mode for paging or sending a broadcast message to the terminal device, the method further includes: The network device determines a paging opportunity for paging the terminal device; The network device determines a method for paging or sending a broadcast message to a terminal device, including: the network device determines a method for paging the terminal device at the paging opportunity.

3. The method according to claim 1, characterized in that The first parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message, and the second parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message.

4. The method according to claim 3, characterized in that The network device paging or sending the broadcast message to the terminal device includes: At the time position, a PDCCH and / or a PDSCH for a paging or broadcast message is transmitted.

5. The method according to claim 3, characterized in that: Each time position corresponds to a single beam scan.

6. The method according to claim 1, characterized in that The first parameter set is associated with one or more parameters of the actual sending of the synchronization signal block.

7. The method according to claim 6, characterized in that The second parameter set is not associated with the parameters of the synchronization signal block actually sent.

8. The method according to claim 1, characterized in that The method further comprises: The network device sends first information to the terminal device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

9. The method according to claim 8, characterized in that The first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

10. The method according to any one of claims 1 to 9, characterized in that The network device determines a method for paging or sending a broadcast message to the terminal device, including: According to the current paging opportunity or the time period for sending the broadcast message, the network device determines the way of performing paging or sending the broadcast message to the terminal device.

11. The method according to claim 10, characterized in that The method further comprises: The network device sends second information to the terminal device, where the second information is used to notify the association between the method of performing paging or sending the broadcast message and the time period.

12. The method according to claim 11, characterized in that The second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

13. The method according to any one of claims 1 to 5, characterized in that The network device determines a method for paging or sending a broadcast message to the terminal device, including: The method of performing paging or sending a broadcast message is determined according to whether a synchronization signal block is sent or a candidate sending time position of a synchronization signal block is sent within the time range of performing paging or sending a broadcast message.

14. The method according to claim 13, characterized in that Determining a method for performing paging or sending a broadcast message according to whether a synchronization signal block or a candidate transmission time position of a synchronization signal block is transmitted within a time range for performing paging or sending a broadcast message includes: Sending a synchronization signal block or a candidate sending time position having a synchronization signal block within a time range for performing paging or sending a broadcast message, and determining that the manner of performing paging or sending a broadcast message is the first manner; If no synchronization signal block is sent or there is no candidate sending time position with a synchronization signal block within the time range for performing paging or sending a broadcast message, the method for performing paging or sending a broadcast message is determined to be the second method.

15. The method according to any one of claims 1 to 5, characterized in that The method of determining, at the specific frequency point, the network device paging or sending a broadcast message to the terminal device includes: When the determined manner is the first manner, at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, of a synchronization signal block actually sent at the specific frequency point is determined as at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, required for performing paging or sending a broadcast message at the specific frequency point; According to at least one of the determined time length, time position, subcarrier spacing and interval between time positions, paging or sending a broadcast message to the terminal device at the specific frequency point.

16. The method according to claim 15, characterized in that According to the determined time length and / or position, paging or sending a broadcast message to the terminal device at the specific frequency point includes: At the specific frequency point, the same beam parameter setting as that for sending the synchronization signal block is used to page the terminal device or send a broadcast message.

17. The method according to any one of claims 1 to 9, characterized in that The network device paging or sending a broadcast message to the terminal device according to the determined manner includes: When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N consecutive time positions at the specific frequency point.

18. The method according to claim 17, characterized in that The N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

19. The method according to any one of claims 1 to 9, characterized in that The network device paging or sending a broadcast message to the terminal device according to the determined manner includes: When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N time positions, and at least two adjacent time positions among the N time positions are discontinuous.

20. The method according to claim 19, characterized in that The N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

21. The method according to claim 20, characterized in that In each of the time slots, the starting points of the T time positions are the Sth symbol of each of the time slots, where S is an integer greater than or equal to 1.

22. The method according to claim 20, characterized in that In each of the time slots, the end point of the T time positions is the Pth last symbol of each of the time slots, where P is an integer greater than or equal to 1.

23. The method according to claim 20, characterized in that When T is greater than 1, any two time positions of the T time positions are discontinuous.

24. The method according to claim 20, characterized in that When T is greater than 1, there are at least two consecutive time positions among the T time positions.

25. The method according to claim 24, characterized in that In the same time slot, the at least two consecutive time positions are spaced apart from the at least two adjacent consecutive time positions by at least one symbol.

26. A wireless communication method, characterized in that: include: The terminal device determines a mode in which the network device pages the terminal device or sends a broadcast message, where the determined mode is one of a first mode and a second mode; Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency; wherein the first parameter set refers to a parameter set used for actually sending a synchronization signal block, and the second parameter set does not refer to a parameter set used for actually sending a synchronization signal block; According to the determined method, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

27. The method according to claim 26, characterized in that Before the terminal device determines the manner in which the network device pages the terminal device or sends a broadcast message, the method further includes: The terminal device determines a paging timing for the network device to page the terminal device; The terminal device determines the manner in which the network device pages the terminal device or sends a broadcast message, including: the terminal device determines the manner in which the network device pages the terminal device within the paging opportunity.

28. The method according to claim 26, characterized in that The first parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message, and the second parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message.

29. The method according to claim 28, characterized in that The terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including: At the time position, the terminal device monitors the PDCCH and / or PDSCH for paging or broadcast messages.

30. The method according to claim 26, characterized in that The first parameter set is associated with one or more parameters of the actual sending of the synchronization signal block.

31. The method according to claim 30, characterized in that The second parameter set is not associated with the parameters of the synchronization signal block actually sent.

32. The method according to claim 26, characterized in that The method further comprises: The terminal device receives first information sent by the network device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

33. The method according to claim 32, characterized in that The first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

34. The method according to any one of claims 26 to 33, characterized in that The terminal device determines a mode in which a network device pages the terminal device or sends a broadcast message, including: According to the current paging opportunity for paging or the time period for sending a broadcast message, the terminal device determines the manner in which the network device pages the terminal device or sends a broadcast message.

35. The method according to claim 34, characterized in that The method further includes: the terminal device receiving second information sent by the network device, the second information being used to notify the association between the mode of performing paging or sending a broadcast message and the time period; or The association between the manner in which the network device performs paging or sends a broadcast message to the terminal device and the time period is preset on the terminal device.

36. The method according to claim 35, characterized in that The second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

37. The method according to any one of claims 26 to 29, characterized in that The terminal device determines a mode in which a network device pages or sends a broadcast message to the terminal device, including: The terminal device determines the manner in which the network device pages or sends a broadcast message to the terminal device according to whether a synchronization signal block is sent or a candidate sending time position of a synchronization signal block is sent within the time range in which the network device paging or sending a broadcast message to the terminal device.

38. The method according to claim 37, characterized in that The terminal device determines, according to whether a synchronization signal block or a candidate transmission time position having a synchronization signal block is sent within a time range in which the network device paging or sending a broadcast message to the terminal device, a manner in which the network device pages or sends a broadcast message to the terminal device, including: Determine, within the time range in which the network device performs paging or broadcast message transmission to the terminal device, a candidate transmission time position in which the network device transmits a synchronization signal block or has a synchronization signal block, and determine that the mode of performing paging or sending a broadcast message is the first mode; Within the time range in which the network device pages or sends a broadcast message to the terminal device, determine a candidate sending time position in which the network device does not send a synchronization signal block or does not have a synchronization signal block, and determine that the method for paging or sending a broadcast message is the second method.

39. The method according to any one of claims 26 to 29, characterized in that The method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including: When the determined manner is the first manner, at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for actually sending the synchronization signal block by the network device at the specific frequency point is determined as at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for the network device to page the terminal device or send a broadcast message at the specific frequency point; According to the determined time length, time position and / or subcarrier spacing, at the specific frequency point, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device.

40. The method according to any one of claims 26 to 33, characterized in that The method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including: When the determined mode is the second mode, at the specific frequency point, at N consecutive time positions, the paging or broadcast message sent by the network device to the terminal device is monitored.

41. The method according to claim 40, characterized in that The N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

42. The method according to any one of claims 26 to 33, characterized in that The method of determining, at the specific frequency point, the terminal device monitors the paging or broadcast message sent by the network device to the terminal device, including: When the determined method is the second method, at N time positions, the terminal device listens to the paging or broadcast message sent by the network device to the terminal device, and there are at least two adjacent time positions among the N time positions that are discontinuous.

43. The method according to claim 42, characterized in that The N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

44. The method according to claim 43, characterized in that In each of the time slots, the starting points of the T time positions are the Sth symbol of each of the time slots, where S is an integer greater than or equal to 1.

45. The method according to claim 43, characterized in that In each of the time slots, the end point of the T time positions is the Pth last symbol of each of the time slots, where P is an integer greater than or equal to 1.

46. ​​The method according to claim 43, characterized in that When T is greater than 1, any two time positions of the T time positions are discontinuous.

47. The method according to claim 43, characterized in that When T is greater than 1, there are at least two consecutive time positions among the T time positions.

48. The method according to claim 47, characterized in that In the same time slot, the at least two consecutive time positions are spaced apart from the at least two adjacent consecutive time positions by at least one symbol.

49. A network device, characterized in that: It includes a processing unit and a communication unit; wherein, The processing unit is used to: determine a mode of paging or sending a broadcast message to the terminal device, wherein the determined mode is one of a first mode and a second mode; Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency; wherein the first parameter set refers to a parameter set used for actually sending a synchronization signal block, and the second parameter set does not refer to a parameter set used for actually sending a synchronization signal block; The communication unit is used to: paging or sending the broadcast message to the terminal device at the specific frequency according to the determined method.

50. The apparatus according to claim 49, characterized in that The processing unit is further configured to: Determining a paging opportunity for paging the terminal device; The communication unit is further used to determine a method for paging the terminal device at the paging opportunity.

51. The apparatus according to claim 49, characterized in that The first parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message, and the second parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message.

52. The device according to claim 51, characterized in that The communication unit is further configured to: At the time position, a PDCCH and / or a PDSCH for a paging or broadcast message is transmitted.

53. The device according to claim 51, characterized in that Each time position corresponds to a single beam scan.

54. The apparatus according to claim 49, characterized in that The first parameter set is associated with one or more parameters of the actual sending of the synchronization signal block.

55. The device according to claim 54, characterized in that The second parameter set is not associated with the parameters of the synchronization signal block actually sent.

56. The apparatus according to claim 49, characterized in that The communication unit is further configured to: Sending first information to the terminal device, wherein the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

57. The device according to claim 56, characterized in that The first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

58. Apparatus according to any one of claims 49 to 57, characterised in that The processing unit is further configured to: The manner of performing paging or sending the broadcast message to the terminal device is determined according to the paging opportunity of the current paging or the time period in which the broadcast message is sent.

59. The device according to claim 58, characterized in that The communication unit is further configured to: Sending second information to the terminal device, wherein the second information is used to notify the association between the method of performing paging or sending the broadcast message and the time period.

60. The device according to claim 59, characterized in that The second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

61. Apparatus according to any one of claims 49 to 53, characterised in that The processing unit is further configured to: The method of performing paging or sending a broadcast message is determined according to whether a synchronization signal block is sent or a candidate sending time position of a synchronization signal block is sent within the time range of performing paging or sending a broadcast message.

62. The device according to claim 61, characterized in that The processing unit is further configured to: Sending a synchronization signal block or a candidate sending time position having a synchronization signal block within a time range for performing paging or sending a broadcast message, and determining that the manner of performing paging or sending a broadcast message is the first manner; If no synchronization signal block is sent or there is no candidate sending time position with a synchronization signal block within the time range for performing paging or sending a broadcast message, the method for performing paging or sending a broadcast message is determined to be the second method.

63. Apparatus according to any one of claims 49 to 53, characterised in that The communication unit is further configured to: When the determined manner is the first manner, at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, of a synchronization signal block actually sent at the specific frequency point is determined as at least one of a time length, at least a portion of symbols in a time position, a subcarrier spacing, and an interval between time positions, required for performing paging or sending a broadcast message at the specific frequency point; According to at least one of the determined time length, time position, subcarrier spacing and interval between time positions, paging or sending a broadcast message to the terminal device at the specific frequency point.

64. The device according to claim 63, characterized in that The communication unit is further configured to: At the specific frequency point, the same beam parameter setting as that for sending the synchronization signal block is used to page the terminal device or send a broadcast message.

65. Apparatus according to any one of claims 49 to 57, characterised in that The communication unit is further configured to: When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N consecutive time positions at the specific frequency point.

66. The device according to claim 65, characterized in that The N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

67. Apparatus according to any one of claims 49 to 57, characterised in that The communication unit is further configured to: When the determined mode is the second mode, paging or broadcasting messages are sent to the terminal device at N time positions, and at least two adjacent time positions among the N time positions are discontinuous.

68. The device according to claim 67, characterized in that The N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

69. The device according to claim 68, characterized in that In each of the time slots, the starting points of the T time positions are the Sth symbol of each of the time slots, where S is an integer greater than or equal to 1.

70. The apparatus of claim 68, wherein: In each of the time slots, the end point of the T time positions is the Pth last symbol of each of the time slots, where P is an integer greater than or equal to 1.

71. The apparatus according to claim 68, characterized in that When T is greater than 1, any two time positions of the T time positions are discontinuous.

72. The apparatus according to claim 68, characterized in that When T is greater than 1, there are at least two consecutive time positions among the T time positions.

73. The device according to claim 72, characterized in that In the same time slot, the at least two consecutive time positions are spaced apart from the at least two adjacent consecutive time positions by at least one symbol.

74. A terminal device, characterized in that: It includes a processing unit and a communication unit; wherein, The processing unit is used to: determine a mode in which the network device pages the terminal device or sends a broadcast message, wherein the determined mode is one of a first mode and a second mode; Wherein, in the first mode, a first parameter set is used for paging or sending a broadcast message at a specific frequency, and in the second mode, a second parameter set is used for paging or sending a broadcast message at a specific frequency; wherein the first parameter set refers to a parameter set used for actually sending a synchronization signal block, and the second parameter set does not refer to a parameter set used for actually sending a synchronization signal block; The communication unit is used for: monitoring the paging or broadcast message sent by the network device to the terminal device at the specific frequency point according to the determined method.

75. The device according to claim 74, characterized in that The processing unit is further configured to: Determining a paging timing for the network device to page the terminal device; Determine the manner in which the network device pages the terminal device within the paging occasion.

76. The apparatus according to claim 74, characterized in that The first parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message, and the second parameter set includes at least one of the following parameters: the time position, time length, subcarrier spacing and interval between time positions required for paging or sending a broadcast message.

77. The device according to claim 76, characterized in that The communication unit is further configured to: At the time position, the PDCCH and / or PDSCH for paging or broadcast messages are monitored.

78. The apparatus according to claim 74, characterized in that The first parameter set is associated with one or more parameters of the actual sending of the synchronization signal block.

79. The device according to claim 78, characterized in that The second parameter set is not associated with the parameters of the synchronization signal block actually sent.

80. The apparatus of claim 74, wherein: The communication unit is further used to: receive first information sent by the network device, where the first information is used to notify a method of performing paging or sending a broadcast message, or to notify the first parameter set and / or the second parameter set.

81. The device according to claim 80, characterized in that The first information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

82. Apparatus according to any one of claims 74 to 81, characterised in that The processing unit is further configured to: The manner in which the network device performs paging or sends a broadcast message to the terminal device is determined according to the current paging opportunity or the time period in which the broadcast message is sent.

83. The device according to claim 82, characterized in that The communication unit is further used to: receive second information sent by the network device, where the second information is used to notify the association between the mode of performing paging or sending broadcast messages and the time period; or The association between the manner in which the network device performs paging or broadcasting to the terminal device and the time period is preset on the terminal device.

84. The device according to claim 83, characterized in that The second information is carried in remaining minimum system information RMSI, other system information OSI, on-demand system information or radio resource control RRC message.

85. Apparatus according to any one of claims 74 to 77, characterised in that The processing unit is further configured to: The manner in which the network device pages or sends a broadcast message to the terminal device is determined based on whether a synchronization signal block is sent or a candidate sending time position of a synchronization signal block within the time range in which the network device paging or sending a broadcast message to the terminal device.

86. The device according to claim 85, characterized in that The processing unit is further configured to: Determine, within the time range in which the network device performs paging or broadcast message transmission to the terminal device, a candidate transmission time position in which the network device transmits a synchronization signal block or has a synchronization signal block, and determine that the mode of performing paging or sending a broadcast message is the first mode; Within the time range in which the network device pages or sends a broadcast message to the terminal device, determine a candidate sending time position in which the network device does not send a synchronization signal block or does not have a synchronization signal block, and determine that the method for paging or sending a broadcast message is the second method.

87. Apparatus according to any one of claims 74 to 77, characterised in that The communication unit is further configured to: When the determined manner is the first manner, at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for actually sending the synchronization signal block by the network device at the specific frequency point is determined as at least one of the time length, at least part of the symbols of the time position, the subcarrier spacing, and the interval of the time position for the network device to page the terminal device or send a broadcast message at the specific frequency point; According to the determined time length, time position and / or subcarrier spacing, at the specific frequency point, the paging or broadcast message sent by the network device to the terminal device is monitored.

88. Apparatus according to any one of claims 74 to 81, characterised in that The communication unit is further configured to: When the determined mode is the second mode, at the specific frequency point, at N consecutive time positions, the paging or broadcast message sent by the network device to the terminal device is monitored.

89. The device according to claim 88, characterized in that The N time positions occupy Q time slots, and the starting point of the N time positions is the Mth symbol of the first time slot among the Q time slots, wherein Q is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

90. The apparatus according to any one of claims 74 to 81, characterized in that The communication unit is further configured to: When the determined method is the second method, at N time positions, the paging or broadcast message sent by the network device to the terminal device is monitored, and there are at least two adjacent time positions among the N time positions that are discontinuous.

91. The device according to claim 90, characterized in that The N time positions occupy R time slots, each time slot includes T time positions, wherein R is an integer greater than or equal to 1, and T is an integer greater than or equal to 1.

92. The device according to claim 91, characterized in that In each of the time slots, the starting points of the T time positions are the Sth symbol of each of the time slots, where S is an integer greater than or equal to 1.

93. The device according to claim 91, characterized in that In each of the time slots, the end point of the T time positions is the Pth last symbol of each of the time slots, where P is an integer greater than or equal to 1.

94. The device according to claim 91, characterized in that When T is greater than 1, any two time positions of the T time positions are discontinuous.

95. The apparatus according to claim 91, characterized in that When T is greater than 1, there are at least two consecutive time positions among the T time positions.

96. The device according to claim 95, characterized in that In the same time slot, the at least two consecutive time positions are spaced apart from the at least two adjacent consecutive time positions by at least one symbol.

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