Signal transmission method, terminal device and network device

Abstract

The present application discloses a signal transmission method, a terminal device and a network device, the method comprising: the network device sends a synchronization signal block index to the terminal device, the synchronization signal block index is used to indicate the target time position used by the network device to send the synchronization signal block; the network device sends a beam index of the synchronization signal block to the terminal device, the beam index is used to indicate the beam used by the network device to send the synchronization signal block. Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, so that the terminal device can know the beam used to send the synchronization signal block according to the beam index, thereby realizing measurement based on the beam.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of wireless communications, and more specifically, to a signal transmission method, a terminal device, and a network device. Background Art

[0002] In the 5G system or the New Radio (NR) system, the network device can send a synchronization signal block (Synchronous Signal Block, SS Block or SSB) to the terminal device. The synchronization signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH).

[0003] In the NR system, network equipment and terminal devices can communicate through unlicensed frequency bands.

[0004] In the NR system, how to transmit synchronization signal blocks in unlicensed frequency bands is an urgent problem to be solved. Summary of the invention

[0005] The embodiments of the present application provide a signal transmission method, terminal device and network device, which can realize the transmission of synchronization signal blocks on unlicensed frequency bands.

[0006] In a first aspect, a signal transmission method is provided, comprising: a network device sends a synchronization signal block index to a terminal device, wherein the synchronization signal block index is used to indicate a target time position used by the network device to send the synchronization signal block; the network device sends a beam index of the synchronization signal block to the terminal device, wherein the beam index is used to indicate a beam used by the network device to send the synchronization signal block.

[0007] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, so that the terminal device can perform relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index according to the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0008] In a possible implementation, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the synchronization signal block to the terminal device at the target time position, and the synchronization signal block carries the beam index.

[0009] In a possible implementation, the synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in an information field of the PBCH.

[0010] In a possible implementation, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0011] In a possible implementation, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0012] In one possible implementation, the network device sends the beam index to the terminal device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block, including: the network device sends the beam index to the terminal device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0013] In one possible implementation, the at least one time domain symbol includes at least one of the following time domain symbols: at least one time domain symbol occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal SSS in the synchronization signal block.

[0014] In one possible implementation, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0015] In a possible implementation, the network device sends the beam index to the terminal device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: the network device sends the beam index to the terminal device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one of the frequency bands occupied by the synchronization signal block.

[0016] In one possible implementation, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0017] In one possible implementation, before the network device sends a synchronization signal block index to the terminal device, the method further includes: the network device monitors whether the carrier on the unlicensed frequency band is idle based on M candidate time positions of the synchronization signal block; and the network device determines the target time position among the M candidate time positions based on the monitoring result.

[0018] In one possible implementation, the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single sending cycle of the synchronization signal block.

[0019] In a possible implementation manner, before each candidate time position in the at least one candidate time position, the network device detects that a carrier on the unlicensed frequency band is idle.

[0020] In one possible implementation, the network device listens to whether the carrier on the unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block, including: the network device listens to whether the carrier on the unlicensed frequency band is idle before each candidate time position of the M candidate time positions, until the carrier on the unlicensed frequency band is heard to be idle before N candidate time positions, or the carrier on the unlicensed frequency band is heard before the last candidate time position of the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

[0021] In one possible implementation, when carrier sensing is performed before each candidate time position, the first beam direction sensed by the network device is consistent with the second beam direction, wherein the second beam direction is: the transmission beam direction expected to be adopted when sending the synchronization signal block at each candidate time position.

[0022] In one possible implementation, when the candidate time positions for actually sending the synchronization signal block are multiple time positions including the target time position, when the synchronization signal block is sent at any two candidate time positions among the multiple candidate time positions, different transmission beams are used.

[0023] In one possible implementation, the network device monitors whether the carrier on the unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block, including: the network device periodically monitors the carrier on the unlicensed frequency band according to the M candidate time positions according to the sending period of the synchronization signal block.

[0024] In one possible implementation, the method further includes: the network device performs rate matching on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

[0025] In a second aspect, a signal transmission method is provided, including: a terminal device receives a synchronization signal block index sent by a network device, wherein the synchronization signal block index is used to indicate a target time position used by the network device to send the synchronization signal block; the terminal device receives a beam index of the synchronization signal block sent by the network device, wherein the beam index is used to indicate a beam used by the network device to send the synchronization signal block.

[0026] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, thereby performing relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0027] In a possible implementation, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the synchronization signal block sent by the network device at the target time position, and the synchronization signal block carries the beam index.

[0028] In a possible implementation, the synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in an information field of the PBCH.

[0029] In a possible implementation, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0030] In a possible implementation, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0031] In a possible implementation, the terminal device receives the beam index sent by the network device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block, including: the terminal device receives the beam index sent by the network device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0032] In one possible implementation, the at least one time domain symbol includes at least one of the following time domain symbols: at least one time domain symbol occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal SSS in the synchronization signal block.

[0033] In one possible implementation, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the beam index sent by the network device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0034] In a possible implementation, the terminal device receives the beam index sent by the network device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: the terminal device receives the beam index sent by the network device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band in the frequency bands occupied by the synchronization signal block.

[0035] In one possible implementation, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0036] In one possible implementation, the method also includes: the terminal device determines M candidate time positions of a synchronization signal block, the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all candidate time positions within a single sending cycle of the synchronization signal block; the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions to obtain the synchronization signal block sent at a target time position among the M candidate time positions.

[0037] In one possible implementation, the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions, including: on the carrier in the unlicensed frequency band, detecting the synchronization signal block at each of the M candidate time positions in turn until a synchronization signal block is acquired at N candidate time positions, or until a synchronization signal block is detected at the last candidate time position among the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

[0038] In one possible implementation, the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions, including: the terminal device periodically receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions according to the sending period.

[0039] In one possible implementation, the method further includes: the terminal device performs rate matching on channels or signals that are not the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

[0040] In a third aspect, a terminal device is provided, which can perform the operations of the terminal device in the first aspect or any optional implementation of the first aspect. Specifically, the terminal device may include a module unit for performing the operations of the terminal device in the first aspect or any possible implementation of the first aspect.

[0041] In a fourth aspect, a network device is provided, which can perform the operations of the network device in the second aspect or any optional implementation of the second aspect. Specifically, the network device may include a module unit for performing the operations of the network device in the second aspect or any possible implementation of the second aspect.

[0042] In a fifth aspect, a terminal device is provided, the terminal device comprising: a processor, a transceiver, and a memory. The processor, the transceiver, and the memory communicate with each other through an internal connection path. The memory is used to store instructions, and the processor is used to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the execution causes the terminal device to execute the method in the first aspect or any possible implementation of the first aspect, or the execution causes the terminal device to implement the terminal device provided by the third aspect.

[0043] In a sixth aspect, a network device is provided, the network device comprising: a processor, a transceiver and a memory. The processor, the transceiver and the memory communicate with each other through an internal connection path. The memory is used to store instructions, and the processor is used to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the execution causes the network device to execute the method in the second aspect or any possible implementation of the second aspect, or the execution causes the network device to implement the network device provided in the fourth aspect.

[0044] In a seventh aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a program, wherein the program enables a terminal device to execute the signal transmission method of the first aspect and any one of its various implementation methods.

[0045] In an eighth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a program, wherein the program enables a network device to execute the signal transmission method of the second aspect and any one of its various implementation methods.

[0046] In the ninth aspect, a system chip is provided, which includes an input interface, an output interface, a processor and a memory, wherein the processor is used to execute instructions stored in the memory. When the instructions are executed, the processor can implement the method in the aforementioned first aspect or any possible implementation of the first aspect.

[0047] In the tenth aspect, a system chip is provided, which includes an input interface, an output interface, a processor and a memory. The processor is used to execute instructions stored in the memory. When the instructions are executed, the processor can implement the method in the aforementioned second aspect or any possible implementation of the second aspect.

[0048] In an eleventh aspect, a computer program product comprising instructions is provided, and when the computer program product is run on a computer, the computer is caused to execute the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0049] In a twelfth aspect, a computer program product comprising instructions is provided. When the computer program product is run on a computer, the computer is caused to execute the method in the above-mentioned second aspect or any possible implementation manner of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application.

[0051] Figure 2 It is a schematic flowchart of the distribution of synchronization signal blocks according to an embodiment of the present application.

[0052] Figure 3 It is a schematic flowchart of the distribution of synchronization signal blocks according to an embodiment of the present application.

[0053] Figure 4 It is a schematic flowchart of a signal transmission method according to an embodiment of the present application.

[0054] FIG5(a) and FIG5(b) are schematic diagrams of resources for sending beam indexes according to an embodiment of the present application.

[0055] FIG6(a) and FIG6(b) are schematic diagrams of resources for sending beam indexes according to an embodiment of the present application.

[0056] FIG. 7( a ) and FIG. 7( b ) are schematic diagrams of resources used to send beam indexes according to an embodiment of the present application.

[0057] FIG8(a) and FIG8(b) are schematic diagrams of resources for sending beam indexes according to an embodiment of the present application.

[0058] Fig. 9 is a schematic flowchart of a signal transmission method according to another embodiment of the present application.

[0059] Fig.10 It is a schematic block diagram of a network device according to an embodiment of the present application.

[0060] Fig.11 It is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0061] Fig.12 is a schematic block diagram of a system chip according to an embodiment of the present application.

[0062] Fig.13 It is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] 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.

[0066] Optionally, terminal devices 120 may perform device-to-device (D2D) communication with each other.

[0067] Optionally, the 5G system or network may also be referred to as a New Radio (NR) system or network.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 (that is, the candidate time position of the synchronization signal block) is L, where:

[0072] For the frequency domain within 3 GHz, L=4.

[0073] For the frequency domain range from 3 GHz to 6 GHz, L=8.

[0074] Corresponding to the frequency domain range of 6 GHz to 52.6 GHz, L=64.

[0075] 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 As shown, each line-filled block may be a time slot.

[0076] in, Figure 2 The first row shows the time slot distribution of SS Block when the subcarrier spacing is 15KHZ and L=4. Figure 2 The second row shows the time slot distribution of SS Block when the subcarrier spacing is 15KHZ and L=8. Figure 2 The third row shows the time slot distribution of SS Block when the subcarrier spacing is 30KHZ and L=4. Figure 2 The fourth row shows the time slot distribution of SS Block when the subcarrier spacing is 30KHZ and L=8. Figure 2 The fifth row shows the time slot distribution of SS Block when the subcarrier spacing is 240KHZ and L=64.

[0077] Figure 3 The figure shows the pattern distribution of the synchronization signal blocks in the time slot under the subcarrier spacing of 15KHZ, 30KHZ, 120KHZ and 240KHZ. Figure 3 In the example, each block can represent a symbol (also called a time domain symbol, symbol position, or time domain symbol position, etc.), the first block in each row represents the first symbol of a time slot, and 14 consecutive symbols constitute a time slot. Four consecutive symbols filled with the same line can be considered as a candidate time position of the synchronization signal block.

[0078] in, Figure 3 The first row shows the pattern distribution of the synchronization signal blocks within the time slot when the subcarrier spacing is 15KHZ. Figure 3The second and third rows show the pattern distribution of the synchronization signal blocks within the time slot when the subcarrier spacing is 30KHZ. Figure 3 The fourth row shows the pattern distribution of the synchronization signal blocks within the time slot when the subcarrier spacing is 120KHZ. Figure 3 The fifth row shows the pattern distribution of the synchronization signal blocks within the time slot when the subcarrier spacing is 240KHZ.

[0079] like Figure 3 As shown, at subcarrier spacings of 15 kHz and 30 kHz, 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.

[0080] At a subcarrier spacing 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.

[0081] At a subcarrier spacing of 240 kHz, 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.

[0082] In the licensed frequency band, the network device may indicate in advance to the terminal device at which candidate time position or positions among the L candidate time positions the network device will send a synchronization signal block to the terminal device.

[0083] In unlicensed frequency bands, Carrier Sense Multiple Access / Collision Detection (CSMA / CD) and Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) can be used. Before transmitting wireless signals, the transmitting node can use the listen before talk (LBT) mechanism to monitor the channel and determine whether the channel is idle.

[0084] In an unlicensed frequency band, if a network device needs to send a signal to a terminal device, it needs to monitor the carrier of the unlicensed frequency band. In specific implementation, the network device can generate a random number before monitoring. If the carrier is always idle within the time range corresponding to the generated random number, the signal can be sent.

[0085] Therefore, in an unlicensed frequency band, when sending a synchronization signal block, if the network device indicates in advance to the terminal device at which candidate time position or positions the network device will send the synchronization signal block to the terminal device, wherein a specific candidate time position corresponds to a specific transmission beam, if the network device cannot seize the pre-specified candidate time position, it is impossible to use the specific transmission beam to send the synchronization signal block, and the terminal device will not be able to receive the synchronization signal block sent by the specific transmission beam at the candidate time position pre-specified by the network device, and cannot achieve synchronization, as well as measurement of the specific beam, etc. To this end, the embodiments of the present application provide such Figure 4 The method 400 shown and the method 500 shown in FIG. 5 can solve this problem.

[0086] Figure 4 It is a schematic flowchart of the signal transmission method of an embodiment of the present application. Figure 4 The method shown may be performed by a network device, which may be, for example, Figure 1 The network device 110 shown in FIG. Figure 3 As shown, the signal transmission method includes:

[0087] In 410, the network device sends a synchronization signal block index to the terminal device, wherein the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block.

[0088] The network device sends the synchronization signal block index to the terminal device, so that the terminal device can receive the synchronization signal block and synchronize according to the time position indicated by the synchronization signal block index.

[0089] In 420, the network device sends the beam index of the synchronization signal block to the terminal device, wherein the beam index is used to indicate the beam used by the network device to send the synchronization signal block.

[0090] Specifically, after the network device determines the target time position for sending the synchronization signal block among multiple candidate time positions that can be used to send the synchronization signal block, it still indicates to the terminal device the target time position used to send the synchronization signal block through the synchronization signal block index (SS Block index or SSBindex). When sending a synchronization signal block on an unlicensed frequency band, if the network device cannot seize the pre-designated candidate time position, it is impossible to use a specific transmission beam to send the synchronization signal block. Therefore, the network device can use a beam index to indicate to the terminal device the beam used to send the synchronization signal block. Therefore, the terminal device can know the beam used to send the synchronization signal block based on the beam index, and thus perform mobility measurement based on the beam.

[0091] The embodiments of the present application provide three methods for sending the beam index, which are described below respectively.

[0092] Method 1

[0093] Optionally, in 420, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the synchronization signal block to the terminal device at the target time position, wherein the synchronization signal block carries the beam index.

[0094] In this embodiment, the network device carries the beam index in the synchronization signal block, and the terminal device can obtain the beam index by receiving the synchronization signal block.

[0095] Optionally, the synchronization signal block includes PBCH, and the beam index is carried in the information domain of the PBCH.

[0096] For example, the beam index may be carried in a payload field in a physical broadcast channel (PBCH) of the synchronization signal block.

[0097] Method 2

[0098] Optionally, in 420, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0099] Optionally, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0100] Optionally, in 420, the network device sends the beam index to the terminal device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block, including: the network device sends the beam index to the terminal device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0101] That is, the beam index may occupy at least one frequency band of two adjacent frequency bands and occupy at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0102] Among them, optionally, the at least one time domain symbol may include at least one of the following: at least one symbol of the time domain symbols occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal (Primary Synchronization Signal, PSS) in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal (Secondary Synchronization Signal, SSS) in the synchronization signal block.

[0103] For example, as shown in FIG5(a), the synchronization signal block includes PBCH, PSS and SSS. Among them, the frequency band occupied by the beam index includes a frequency band adjacent to the frequency band of the synchronization signal block, and the time domain symbols occupied by the beam index include symbols occupied by PBCH and symbols occupied by PSS. For another example, as shown in FIG5(b), the frequency band occupied by the beam index includes another frequency band adjacent to the frequency band of the synchronization signal block, and the time domain symbols occupied by the beam index include symbols occupied by PBCH and symbols occupied by PSS.

[0104] It should be understood that the relative time-frequency resource positions of PBCH, PSS and SSS shown in Figures 5(a) and 5(b) are merely examples, and the time-frequency resources occupied by PBCH, PSS and SSS may also be as shown in Figures 6(a) and 6(b), for example.

[0105] Method 3

[0106] Optionally, in 420, the network device sends the beam index of the synchronization signal block to the terminal device, including: the network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0107] Optionally, in 420, the network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: the network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band of the frequency bands occupied by the synchronization signal block.

[0108] That is, the beam index may occupy at least one time domain symbol of the two adjacent time domain symbols and occupy at least one frequency band of the two frequency bands adjacent to the frequency band of the synchronization signal block.

[0109] Optionally, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0110] For example, as shown in FIG7(a), the synchronization signal block includes PBCH, PSS and SSS. The time domain symbol occupied by the beam index includes a time domain symbol adjacent to the time domain of the synchronization signal block, and the frequency band occupied by the beam index includes the frequency band occupied by the PSS. For another example, as shown in FIG7(b), the time domain symbol occupied by the beam index includes another time domain symbol adjacent to the time domain of the synchronization signal block, and the frequency band occupied by the beam index includes the maximum frequency band occupied by PBCH.

[0111] The relative time-frequency resource positions of PBCH, PSS and SSS shown in Figures 7(a) and 7(b) are merely examples. The time-frequency resources occupied by PBCH, PSS and SSS may also be as shown in Figures 8(a) and 8(b), for example.

[0112] Optionally, in an embodiment of the present application, the maximum frequency band (bandwidth) occupied by the PBCH in the synchronization signal block can be 20 PRBs, the frequency band (bandwidth) occupied by the PSS can be 12 PRBs, and the frequency band (bandwidth) occupied by the SSS can be 12 PRBs.

[0113] Taking Figures 6 and 8 as examples, a synchronization signal block occupies four symbols, the first symbol transmits PSS, occupying 12 PRBs; the third symbol transmits SSS, occupying 12 PRBs; and the second to fourth symbols transmit PBCH. Among them, the frequency band occupied by PBCH in the second and fourth symbols includes 20 PRBs, and the frequency band occupied in the third symbol includes 8 PRBs, and the 8 PRBs are symmetrically distributed at both ends of the frequency band of SSS. For example, in the third symbol in Figure 8 (a), among the 20 PRBs, the first 4 PRBs transmit PBCH, the middle 12 PRBs transmit SSS, and the last 4 PRBs transmit PBCH.

[0114] Optionally, before 410, that is, before the network device sends the synchronization signal block index to the terminal device, the method also includes: the network device monitors whether the carrier on the unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block; and the network device determines the target time position among the M candidate time positions based on the monitoring results.

[0115] Optionally, the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single sending cycle of the synchronization signal block.

[0116] Among them, M is an integer greater than or equal to 1. When M is greater than 1, the M candidate time positions can be multiple consecutive candidate time positions (that is, there are no other candidate time positions between the candidate time positions, but it does not mean that there are no symbols not used for the candidate time positions). For example, when the subcarrier spacing is 15KHZ and L=4, the M candidate time positions can be two candidate time positions in a time slot, or can be the second candidate time position of the previous time slot of two time slots, and the first candidate time position of the next time slot.

[0117] Alternatively, the M candidate time positions may be a plurality of discontinuous candidate time positions (i.e., other candidate time positions may be interspersed between the candidate time positions). For example, when the subcarrier spacing is 15KHZ and L=4, the M candidate time positions may include the first candidate time position of the previous time slot of the two time slots, and the first candidate time position of the next time slot.

[0118] Optionally, the network device listens to whether the carrier on the unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block, including: the network device listens to whether the carrier on the unlicensed frequency band is idle before each candidate time position of the M candidate time positions in turn, until the carrier on the unlicensed frequency band is heard to be idle before N candidate time positions, or the carrier on the unlicensed frequency band is heard before the last candidate time position of the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

[0119] For example, Figure 2 and Figure 3 As shown, when the subcarrier spacing is 15KHZ, L=4, if M=2, since there are spacing symbols between adjacent candidate time positions regardless of whether the candidate time positions are continuous or discontinuous, when carrier sensing can be performed on the M candidate time positions, carrier sensing can be performed before each candidate time position in the time order of the candidate time positions.

[0120] It should be understood that if there is no spaced symbol between two adjacent candidate time positions in the M candidate time positions (for example, Figure 3The 2nd, 4th and 5th rows in the time slot represent the continuous candidate time positions existing in the time slot). If the synchronization signal block is sent at the previous candidate time position between the two adjacent candidate time positions, there is no need to perform carrier sensing at the next candidate time position. Among them, the description mentioned in the embodiment of the present application that "the network device can monitor whether the carrier on the unlicensed frequency band is idle before each of the M candidate time positions in turn, until the carrier on the unlicensed frequency band is sensed to be idle before N candidate time positions, or until the carrier on the unlicensed frequency band is sensed before the last candidate time position in the M candidate time positions" takes into account the general situation. The situation where there is no symbol interval between two adjacent candidate time positions and there is no need to perform carrier sensing due to the sending of a synchronization signal block at the previous candidate time position is also within the protection scope of this description.

[0121] Optionally, when performing carrier sensing before each candidate time position, the first beam direction sensed by the network device is consistent with the second beam direction, wherein the second beam direction is: the transmitting beam direction expected to be adopted when sending the synchronization signal block at each candidate time position.

[0122] Specifically, when the network device performs carrier monitoring before a candidate time position, if it is expected to use beam direction A to send a synchronization signal block at the candidate time position, the carrier can be monitored in beam direction A.

[0123] Optionally, when the candidate time positions for actually sending the synchronization signal block are multiple time positions including the target time position, when the synchronization signal block is sent at any two candidate time positions among the multiple candidate time positions, different transmission beams are used.

[0124] Optionally, before each candidate time position in the at least one candidate time position, the network device detects that the carrier on the unlicensed frequency band is idle.

[0125] Optionally, the network device periodically monitors the carrier on the unlicensed frequency band according to the M candidate time positions according to the sending period of the synchronization signal block.

[0126] Correspondingly, the terminal device periodically receives signals on the carrier of the unlicensed frequency band based on the M candidate time positions according to the sending cycle.

[0127] Optionally, the network device performs rate matching on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

[0128] Accordingly, the terminal device performs rate matching on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

[0129] Specifically, since the M candidate time positions are possible positions that can be used to send the main synchronization signal block in the unlicensed frequency band, when performing rate matching on the unlicensed frequency band, the network device and the terminal device can assume that the M candidate time positions are occupied by the synchronization signal block and perform rate matching on other channels or signals, thereby achieving the correctness of rate matching.

[0130] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, thereby performing relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0131] Fig. 9 It is a schematic flowchart of the signal transmission method of an embodiment of the present application. Fig. 9 The method shown can be executed by a terminal device, which can be, for example, Figure 1 The terminal device 120 shown in FIG. Fig. 9 As shown, the signal transmission method includes:

[0132] In 910, the terminal device receives a synchronization signal block index sent by a network device, where the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block.

[0133] In 920, the terminal device receives the beam index of the synchronization signal block sent by the network device, where the beam index is used to indicate the beam used by the network device to send the synchronization signal block.

[0134] After the terminal device receives the beam index of the synchronization signal block sent by the network device in the above manner, it can perform measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, it can perform mobility measurements (for example, radio resource management (Radio Resource Management, RRM), radio link monitoring (Radio link Monitoring, RLM), or beam management-related measurements.

[0135] For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks having the same transmission beam in at least one transmission cycle.

[0136] For another example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks having the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0137] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, thereby performing relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0138] Optionally, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the synchronization signal block sent by the network device at the target time position, and the synchronization signal block carries the beam index.

[0139] Optionally, the synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information domain of the PBCH.

[0140] Optionally, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0141] Optionally, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0142] Optionally, the terminal device receives the beam index sent by the network device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block, including: the terminal device receives the beam index sent by the network device on at least one of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0143] Optionally, the at least one time domain symbol includes at least one of the following time domain symbols: at least one time domain symbol occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal SSS in the synchronization signal block.

[0144] Optionally, the terminal device receives the beam index of the synchronization signal block sent by the network device, including: the terminal device receives the beam index sent by the network device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0145] Optionally, the terminal device receives the beam index sent by the network device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: the terminal device receives the beam index sent by the network device on at least one of the two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band among the frequency bands occupied by the synchronization signal block.

[0146] Optionally, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0147] Optionally, the method also includes: the terminal device determines M candidate time positions of the synchronization signal block, the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all candidate time positions within a single sending cycle of the synchronization signal block; the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions to obtain the synchronization signal block sent at a target time position among the M candidate time positions.

[0148] Optionally, the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions, including: on the carrier in the unlicensed frequency band, detecting the synchronization signal block at each of the M candidate time positions in turn until a synchronization signal block is acquired at N candidate time positions, or until a synchronization signal block is detected at the last candidate time position among the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

[0149] Optionally, the terminal device receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions, including: the terminal device periodically receives signals on a carrier in an unlicensed frequency band based on the M candidate time positions according to the sending period.

[0150] Optionally, the method also includes: the terminal device performs rate matching on channels or signals that are not the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

[0151] It should be understood that the specific process of the terminal device receiving the paging of the network device can refer to the aforementioned Figure 2 For the sake of brevity, the relevant descriptions of network devices in are not repeated here.

[0152] It should also be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0153] The above describes in detail the data retransmission method according to the embodiment of the present application. Figures 10 to 13 , describing the technical features described in the device and method embodiments according to the embodiments of the present application are applicable to the following device embodiments.

[0154] Fig.10 1 is a schematic block diagram of a network device 1000 according to an embodiment of the present application. Fig.10 As shown, the network device 1000 includes a sending unit 1010. The sending unit 1010 is used for:

[0155] Sending a synchronization signal block index to a terminal device, where the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block;

[0156] A beam index of the synchronization signal block is sent to the terminal device, where the beam index is used to indicate the beam used by the network device to send the synchronization signal block.

[0157] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, thereby performing relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0158] Optionally, the sending unit 1010 is specifically used to: send the synchronization signal block to the terminal device at the target time position, and the synchronization signal block carries the beam index.

[0159] Optionally, the synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information domain of the PBCH.

[0160] Optionally, the sending unit 1010 is specifically used to send the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0161] Optionally, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0162] Optionally, the sending unit 1010 is specifically used to send the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0163] Optionally, the at least one time domain symbol includes at least one of the following time domain symbols: at least one time domain symbol occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal SSS in the synchronization signal block.

[0164] Optionally, the sending unit 1010 is specifically used to send the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0165] Optionally, the sending unit 1010 is specifically used to send the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band of the frequency bands occupied by the synchronization signal block.

[0166] Optionally, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0167] Optionally, the network device also includes a listening unit, which is used to: based on the M candidate time positions of the synchronization signal block, listen to whether the carrier on the unlicensed frequency band is idle; and determine the target time position among the M candidate time positions according to the listening result.

[0168] Optionally, the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single sending cycle of the synchronization signal block.

[0169] It should be understood that the network device 1000 may correspond to the network device in the method 400 and may implement the operations implemented by the network device in the method 400 . For the sake of brevity, details will not be given here.

[0170] Fig.11 1 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application. Fig.11 As shown, the terminal device 1100 includes a receiving unit 1110. The receiving unit 1110 is used for:

[0171] Receiving a synchronization signal block index sent by a network device, where the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block;

[0172] Receive a beam index of the synchronization signal block sent by the network device, where the beam index is used to indicate the beam used by the network device to send the synchronization signal block.

[0173] Therefore, when sending a synchronization signal block on an unlicensed frequency band, the network device uses a beam index to indicate to the terminal device the beam used to send the synchronization signal block, thereby performing relevant measurements based on the transmission beam of the synchronization signal block indicated by the beam index. For example, each measurement cycle may include at least one transmission cycle, and the terminal device may average the measurement results of the synchronization signal blocks with the same transmission beam in multiple transmission cycles in multiple measurement cycles.

[0174] Optionally, the receiving unit 1110 is specifically used to: receive the synchronization signal block sent by the network device at the target time position, and the synchronization signal block carries the beam index.

[0175] Optionally, the synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information domain of the PBCH.

[0176] Optionally, the receiving unit 1110 is specifically used to: receive the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

[0177] Optionally, the bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

[0178] Optionally, the receiving unit 1110 is specifically used to receive the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

[0179] Optionally, the at least one time domain symbol includes at least one of the following time domain symbols: at least one time domain symbol occupied by the PBCH in the synchronization signal block, the time domain symbol occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbol occupied by the secondary synchronization signal SSS in the synchronization signal block.

[0180] Optionally, the receiving unit 1110 is specifically used to receive the beam index sent by the network device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

[0181] Optionally, the receiving unit 1110 is specifically used to receive the beam index sent by the network device on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band of the frequency bands occupied by the synchronization signal block.

[0182] Optionally, the at least one frequency band includes at least one of: a maximum frequency band occupied by a PBCH in the synchronization signal block, a frequency band occupied by a PSS in the synchronization signal block, and a frequency band occupied by an SSS in the synchronization signal block.

[0183] Optionally, the terminal device further includes a determining unit, configured to determine M candidate time positions of a synchronization signal block, where the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all candidate time positions within a single sending cycle of the synchronization signal block;

[0184] The receiving unit 1110 is further used to: based on the M candidate time positions determined by the determining unit, receive signals on a carrier in an unlicensed frequency band to obtain the synchronization signal block sent at a target time position among the M candidate time positions.

[0185] It should be understood that the terminal device 1100 can correspond to the terminal device in method 500 and can implement the operations implemented by the terminal device in method 500. For the sake of brevity, they will not be repeated here.

[0186] Fig.12 1 is a schematic structural diagram of a communication device 1200 according to an embodiment of the present application. Fig.12As shown, the communication device includes a processor 1210, a transceiver 1220 and a memory 1230, wherein the processor 1210, the transceiver 1220 and the memory 1230 communicate with each other through an internal connection path. The memory 1230 is used to store instructions, and the processor 1210 is used to execute the instructions stored in the memory 1230 to control the transceiver 1220 to receive or send signals.

[0187] Optionally, the processor 1210 may call program codes stored in the memory 1230 to execute corresponding operations of the method 400 executed by the network device in the method embodiment, which will not be described in detail here for the sake of brevity.

[0188] Optionally, the processor 1210 may call program code stored in the memory 1230 to execute corresponding operations of the method 500 executed by the terminal device in the method embodiment, which will not be described in detail here for the sake of brevity.

[0189] 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.

[0190] 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.

[0191] Fig.13 It is a schematic structural diagram of the system chip of an embodiment of the present application. Fig.13 The system chip 1300 includes an input interface 1301, an output interface 1302, at least one processor 1303, and a memory 1304. The input interface 1301, the output interface 1302, the processor 1303, and the memory 1304 are interconnected through an internal connection path. The processor 1303 is used to execute the code in the memory 1304.

[0192] Optionally, when the code is executed, the processor 1303 may implement the method 400 executed by the network device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0193] Optionally, when the code is executed, the processor 1303 may implement the method 400 executed by the terminal device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0194] It should be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0195] It should also be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. 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.

[0196] 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.

[0197] 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.

[0198] 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 unit 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.

[0199] 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.

[0200] In addition, each functional unit in each embodiment of the present application may be integrated into one monitoring unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0201] 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.

[0202] 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 signal transmission method, characterized in that: The method comprises: The network device sends a synchronization signal block index to the terminal device, where the synchronization signal block index is used to indicate a target time position used by the network device to send the synchronization signal block; The network device sends a beam index of the synchronization signal block to the terminal device, where the beam index is used to indicate a beam used by the network device to send the synchronization signal block; Before the network device sends the synchronization signal block index to the terminal device, the method further includes: The network device monitors whether the carrier on the unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block; The network device determines the target time position from the M candidate time positions according to the monitoring result.

2. The method according to claim 1, characterized in that The network device sending the beam index of the synchronization signal block to the terminal device includes: The network device sends the synchronization signal block to the terminal device at the target time position, and the synchronization signal block carries the beam index.

3. The method according to claim 2, characterized in that The synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information field of the PBCH.

4. The method according to claim 1, characterized in that: The network device sending the beam index of the synchronization signal block to the terminal device includes: The network device sends the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

5. The method according to claim 4, characterized in that The bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

6. The method according to claim 4 or 5, characterized in that: The network device sends the beam index to the terminal device on at least one of two frequency bands adjacent to a frequency band occupied by the synchronization signal block, including: The network device sends the beam index to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

7. The method according to claim 6, characterized in that The at least one time domain symbol includes at least one of the following time domain symbols: At least one of the time domain symbols occupied by the PBCH in the synchronization signal block, the time domain symbols occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbols occupied by the secondary synchronization signal SSS in the synchronization signal block.

8. The method according to claim 1, characterized in that The network device sending the beam index of the synchronization signal block to the terminal device includes: The network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

9. The method according to claim 8, characterized in that The network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: The network device sends the beam index to the terminal device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band of the frequency bands occupied by the synchronization signal block.

10. The method according to claim 9, characterized in that The at least one frequency band includes at least one of the following: The maximum frequency band occupied by the PBCH in the synchronization signal block, the frequency band occupied by the PSS in the synchronization signal block, and the frequency band occupied by the SSS in the synchronization signal block.

11. The method according to claim 1, characterized in that: The M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single sending cycle of the synchronization signal block.

12. The method according to claim 11, characterized in that Before each candidate time position of the at least one candidate time position, the network device detects that a carrier on the unlicensed frequency band is idle.

13. The method according to claim 11 or 12, characterized in that: The network device monitors whether a carrier on an unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block, including: The network device listens to whether the carrier on the unlicensed frequency band is idle before each candidate time position among the M candidate time positions in turn, until the carrier on the unlicensed frequency band is idle before N candidate time positions, or until the carrier on the unlicensed frequency band is listened to before the last candidate time position among the M candidate time positions, where N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

14. The method according to claim 12, characterized in that When carrier sensing is performed before each candidate time position, the first beam direction sensed by the network device is consistent with the second beam direction, wherein the second beam direction is: the transmission beam direction expected to be adopted when sending the synchronization signal block at each candidate time position.

15. The method according to any one of claims 1, 11, 12 and 14, characterized in that When the candidate time positions for actually sending the synchronization signal block are multiple time positions including the target time position, when the synchronization signal block is sent at any two candidate time positions among the multiple candidate time positions, different transmission beams are used.

16. The method according to any one of claims 1, 11, 12 and 14, characterized in that The network device monitors whether a carrier on an unlicensed frequency band is idle based on the M candidate time positions of the synchronization signal block, including: The network device periodically monitors the carrier on the unlicensed frequency band according to the M candidate time positions according to the sending period of the synchronization signal block.

17. The method according to any one of claims 1, 11, 12 and 14, characterized in that The method further comprises: The network device performs rate matching on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

18. A signal transmission method, characterized in that: The method comprises: The terminal device receives a synchronization signal block index sent by a network device, where the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block; The terminal device receives a beam index of the synchronization signal block sent by the network device, where the beam index is used to indicate a beam used by the network device to send the synchronization signal block; Wherein, the method further comprises: The terminal device determines M candidate time positions of a synchronization signal block, where the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all candidate time positions within a single transmission cycle of the synchronization signal block; Based on the M candidate time positions, the terminal device receives signals on a carrier in an unlicensed frequency band to obtain the synchronization signal block sent at a target time position among the M candidate time positions.

19. The method according to claim 18, characterized in that The terminal device receives the beam index of the synchronization signal block sent by the network device, including: The terminal device receives the synchronization signal block sent by the network device at the target time position, and the synchronization signal block carries the beam index.

20. The method according to claim 19, characterized in that The synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information field of the PBCH.

21. The method according to claim 18, characterized in that The terminal device receives the beam index of the synchronization signal block sent by the network device, including: The terminal device receives the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

22. The method according to claim 21, characterized in that The bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

23. The method according to claim 21 or 22, characterized in that The terminal device receives the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block, including: The terminal device receives the beam index sent by the network device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

24. The method according to claim 23, characterized in that The at least one time domain symbol includes at least one of the following time domain symbols: At least one of the time domain symbols occupied by the PBCH in the synchronization signal block, the time domain symbols occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbols occupied by the secondary synchronization signal SSS in the synchronization signal block.

25. The method according to claim 18, characterized in that The terminal device receives the beam index of the synchronization signal block sent by the network device, including: The terminal device receives the beam index sent by the network device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

26. The method according to claim 25, characterized in that The terminal device receives the beam index sent by the network device on at least one time domain symbol of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block, including: The terminal device receives the beam index sent by the network device on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one of the frequency bands occupied by the synchronization signal block.

27. The method according to claim 26, characterized in that The at least one frequency band includes at least one of the following: The maximum frequency band occupied by the PBCH in the synchronization signal block, the frequency band occupied by the PSS in the synchronization signal block, and the frequency band occupied by the SSS in the synchronization signal block.

28. The method according to claim 18, characterized in that The terminal device receives a signal on a carrier in an unlicensed frequency band based on the M candidate time positions, including: On the carrier of the unlicensed frequency band, the synchronization signal block is detected at each of the M candidate time positions in turn until the synchronization signal block is acquired at N candidate time positions, or until the synchronization signal block is detected at the last candidate time position among the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

29. The method according to claim 18 or 28, characterized in that The terminal device receives a signal on a carrier in an unlicensed frequency band based on the M candidate time positions, including: The terminal device receives signals on a carrier in an unlicensed frequency band periodically based on the M candidate time positions according to the sending period.

30. The method according to claim 18 or 28, characterized in that The method further comprises: The terminal device performs rate matching on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

31. A network device, characterized in that: The network equipment includes: A sending unit, configured to send a synchronization signal block index to a terminal device, wherein the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block; The sending unit is further used to send a beam index of the synchronization signal block to the terminal device, where the beam index is used to indicate a beam used by the network device to send the synchronization signal block; The network device further includes a monitoring unit, which is used to: Based on the M candidate time positions of the synchronization signal block, monitoring whether the carrier on the unlicensed frequency band is idle; According to the monitoring result, the target time position is determined among the M candidate time positions.

32. The network device according to claim 31, characterized in that: The sending unit is specifically used for: The synchronization signal block is sent to the terminal device at the target time position, and the synchronization signal block carries the beam index.

33. The network device according to claim 32, characterized in that: The synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information field of the PBCH.

34. The network device according to claim 31, characterized in that The sending unit is specifically used for: The beam index is sent to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

35. The network device according to claim 34, characterized in that: The bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

36. The network device according to claim 34 or 35, characterized in that: The sending unit is specifically used for: The beam index is sent to the terminal device on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

37. The network device according to claim 36, characterized in that: The at least one time domain symbol includes at least one of the following time domain symbols: At least one of the time domain symbols occupied by the PBCH in the synchronization signal block, the time domain symbols occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbols occupied by the secondary synchronization signal SSS in the synchronization signal block.

38. The network device according to claim 31, characterized in that The sending unit is specifically used for: The beam index is sent to the terminal device on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

39. The network device according to claim 38, characterized in that: The sending unit is specifically used for: The beam index is sent to the terminal device on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band occupied by the synchronization signal block.

40. The network device according to claim 39, characterized in that: The at least one frequency band includes at least one of the following: The maximum frequency band occupied by the PBCH in the synchronization signal block, the frequency band occupied by the PSS in the synchronization signal block, and the frequency band occupied by the SSS in the synchronization signal block.

41. The network device according to claim 31, characterized in that The M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single sending cycle of the synchronization signal block.

42. The network device according to claim 41, characterized in that Before each candidate time position of the at least one candidate time position, the network device detects that a carrier on the unlicensed frequency band is idle.

43. The network device according to claim 41 or 42, characterized in that: The listening unit is specifically used for: Before each of the M candidate time positions, the carrier on the unlicensed frequency band is listened to in turn to see whether it is idle, until the carrier on the unlicensed frequency band is listened to to be idle before N candidate time positions, or until the carrier on the unlicensed frequency band is listened to before the last candidate time position among the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

44. The network device according to claim 42, characterized in that When carrier sensing is performed before each candidate time position, the first beam direction sensed by the sensing unit is consistent with the second beam direction, wherein the second beam direction is: the transmission beam direction expected to be adopted when sending the synchronization signal block at each candidate time position.

45. The network device according to any one of claims 31, 41, 42 and 44, characterized in that: When the candidate time positions for actually sending the synchronization signal block are multiple time positions including the target time position, when the synchronization signal block is sent at any two candidate time positions among the multiple candidate time positions, different transmission beams are used.

46. ​​The network device according to any one of claims 31, 41, 42 and 44, characterized in that: The listening unit is specifically used for: According to the transmission period of the synchronization signal block, the carrier on the unlicensed frequency band is periodically monitored according to the M candidate time positions.

47. The network device according to any one of claims 31, 41, 42 and 44, characterized in that: The network device further includes a processing unit, configured to: Rate matching is performed on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

48. A terminal device, characterized in that: The terminal device comprises: A receiving unit, configured to receive a synchronization signal block index sent by a network device, wherein the synchronization signal block index is used to indicate a target time position used by the network device to send a synchronization signal block; The receiving unit is further used to receive a beam index of the synchronization signal block sent by the network device, where the beam index is used to indicate a beam used by the network device to send the synchronization signal block; The terminal device further includes a determining unit. The determining unit is configured to determine M candidate time positions of a synchronization signal block, where the M candidate time positions are at least part of the L candidate time positions of the synchronization signal block, and the L candidate time positions are all the candidate time positions within a single transmission cycle of the synchronization signal block; The receiving unit is further used to: based on the M candidate time positions determined by the determining unit, receive signals on a carrier in an unlicensed frequency band to obtain the synchronization signal block sent at a target time position among the M candidate time positions.

49. The terminal device according to claim 48, characterized in that: The receiving unit is specifically used for: The synchronization signal block sent by the network device is received at the target time position, and the synchronization signal block carries the beam index.

50. The terminal device according to claim 49, characterized in that: The synchronization signal block includes a physical broadcast channel PBCH, and the beam index is carried in the information field of the PBCH.

51. The terminal device according to claim 48, characterized in that: The receiving unit is specifically used for: The beam index sent by the network device is received on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block.

52. The terminal device according to claim 51, characterized in that: The bandwidths of the two frequency bands adjacent to the frequency band occupied by the synchronization signal block are the same.

53. The terminal device according to claim 51 or 52, characterized in that: The receiving unit is specifically used for: The beam index sent by the network device is received on at least one of two frequency bands adjacent to the frequency band occupied by the synchronization signal block and on at least one time domain symbol of the time domain symbols occupied by the synchronization signal block.

54. The terminal device according to claim 53, characterized in that: The at least one time domain symbol includes at least one of the following time domain symbols: At least one of the time domain symbols occupied by the PBCH in the synchronization signal block, the time domain symbols occupied by the primary synchronization signal PSS in the synchronization signal block, and the time domain symbols occupied by the secondary synchronization signal SSS in the synchronization signal block.

55. The terminal device according to claim 48, characterized in that: The receiving unit is specifically used for: The beam index sent by the network device is received on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block.

56. The terminal device according to claim 55, characterized in that: The receiving unit is specifically used for: The beam index sent by the network device is received on at least one of two time domain symbols adjacent to the time domain symbol occupied by the synchronization signal block and on at least one frequency band occupied by the synchronization signal block.

57. The terminal device according to claim 56, characterized in that: The at least one frequency band includes at least one of the following: The maximum frequency band occupied by the PBCH in the synchronization signal block, the frequency band occupied by the PSS in the synchronization signal block, and the frequency band occupied by the SSS in the synchronization signal block.

58. The terminal device according to claim 48, characterized in that: The receiving unit is specifically used for: On the carrier of the unlicensed frequency band, the synchronization signal block is detected at each of the M candidate time positions in turn until the synchronization signal block is acquired at N candidate time positions, or until the synchronization signal block is detected at the last candidate time position among the M candidate time positions, wherein N is the number of candidate time positions at which the network device expects to send the synchronization signal block, and N is a positive integer less than or equal to M.

59. The terminal device according to claim 48 or 58, characterized in that: The receiving unit is specifically used for: According to the sending cycle, signal reception is performed on a carrier in an unlicensed frequency band periodically based on the M candidate time positions.

60. The terminal device according to claim 48 or 58, characterized in that: The terminal device further includes a processing unit, configured to: Rate matching is performed on channels or signals other than the synchronization signal block in a manner assuming that the M candidate time positions are occupied by the synchronization signal block.

61. A network device, characterized in that: The device comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver communicate with each other through an internal connection path; wherein, The memory is used to store instructions; The processor is configured to execute instructions stored in the memory to control the transceiver to perform the method according to any one of claims 1 to 17.

62. A terminal device, characterized in that: The device comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver communicate with each other through an internal connection path; wherein, The memory is used to store instructions; The processor is configured to execute instructions stored in the memory to control the transceiver to perform the method according to any one of claims 18 to 30.

63. A computer-readable storage medium having instructions stored thereon, the instructions being used to cause a network device to execute the method according to any one of claims 1 to 17.

64. A computer-readable storage medium having instructions stored thereon, the instructions being used to cause a terminal device to execute the method according to any one of claims 18 to 30.

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