Communication methods, terminal devices and network devices

Abstract

Provided are communication methods, terminal devices and network devices. A communication method comprises: a terminal device receives a synchronization signal and physical broadcast channel block (SSB) sent by a network device, the SSB being used for acquiring system information of the network device, the SSB comprising a first bit field, and the first bit field being used for indicating that the SSB is an NCD SSB. Regardless of whether the SSB sent by the network device comprises system information, the first bit field in the SSB indicates that the SSB is an NCD SSB. In this way, for terminal devices that do not support on-demand SSBs, upon receiving on-demand SSBs, the terminal devices will not erroneously use the SSBs not belonging to them for access and measurement.

Description

Communication method, terminal device and network device TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and more particularly, to a communication method, a terminal device and a network device. BACKGROUND

[0002] When there are different versions of terminal devices in a communication system, a synchronization signal block / physical broadcast channel block (SS / PBCH block, SSB) sent for a version of terminal device may be received by another version of terminal device and used for cell access and measurement by mistake.

[0003] SUMMARY

[0004] The present application provides a communication method, a terminal device and a network device. Each aspect of the present application is described below.

[0005] In a first aspect, a communication method is provided, comprising: receiving, by a terminal device, an SSB sent by a network device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is an NCD SSB.

[0006] In a second aspect, a communication method is provided, comprising: sending, by a network device, an SSB to a terminal device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is an NCD SSB.

[0007] In a third aspect, a communication method is provided, comprising: receiving, by a terminal device, an SSB sent by a network device, the SSB being a first SSB or a second SSB; wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and the first SSB and the second SSB have different formats.

[0008] In a fourth aspect, a communication method is provided, comprising: sending, by a network device, an SSB to a terminal device, the SSB being a first SSB or a second SSB; wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and the first SSB and the second SSB have different formats.

[0009] In a fifth aspect, a terminal device is provided, comprising: a receiving unit configured to receive an SSB transmitted by a network device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is an NCD SSB.

[0010] In a sixth aspect, a network device is provided, comprising: a transmitting unit configured to transmit an SSB to a terminal device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is an NCD SSB.

[0011] In a seventh aspect, a terminal device is provided, comprising: a receiving unit configured to receive an SSB transmitted by a network device, the SSB being a first SSB or a second SSB, wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and the first SSB and the second SSB are different in format.

[0012] In an eighth aspect, a network device is provided, comprising: a transmitting unit configured to transmit an SSB to a terminal device, the SSB being a first SSB or a second SSB, wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and the first SSB and the second SSB are different in format.

[0013] In a ninth aspect, a terminal device is provided, comprising a processor, a memory, and a transceiver, the memory being configured to store one or more computer programs, and the processor being configured to invoke the computer programs in the memory to cause the terminal device to perform some or all of the steps in the method of the first aspect or the third aspect.

[0014] In a tenth aspect, a network device is provided, comprising a processor, a memory, and a transceiver, the memory being configured to store one or more computer programs, and the processor being configured to invoke the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect or the fourth aspect.

[0015] In an eleventh aspect, an embodiment of the present application provides a communication system, comprising the terminal device and / or the network device described above. In some implementations, the communication system further comprises other devices interacting with the terminal device and / or the network device in the schemes provided by the embodiments of the present application.

[0016] In a twelfth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program. The computer program causes a terminal device and / or network device to perform some or all of the steps of the methods in the various aspects described above.

[0017] In a thirteenth aspect, an embodiment of the present application provides a computer program product. The computer program product includes a non-transitory computer readable storage medium storing a computer program. The computer program is operable to cause a terminal device and / or network device to perform some or all of the steps of the methods in the various aspects described above. In some implementations, the computer program product can be a software installation package.

[0018] In a fourteenth aspect, an embodiment of the present application provides a chip. The chip includes a memory and a processor. The processor can invoke and run a computer program from the memory to implement some or all of the steps described in the methods in the various aspects described above.

[0019] In the embodiments of the present application, whether the SSB sent by the network device includes system information or not, the first bit field in the SSB indicates that the SSB is an NCD SSB. Thus, for a terminal device that does not support on-demand SSB, it will not incorrectly use an SSB that does not belong to itself for access and measurement when receiving an on-demand SSB, thereby reducing the impact on its communication. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a schematic diagram of a wireless communication system to which embodiments of the present application are applied.

[0021] FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0022] FIG. 3 is a schematic diagram of SSB beam sweeping and SSB burst set transmission time.

[0023] FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present application.

[0024] FIG. 5 is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0025] FIG. 6 is a schematic block diagram of a network device according to an embodiment of the present application.

[0026] FIG. 7 is a schematic block diagram of a terminal device according to another embodiment of the present application.

[0027] FIG. 8 is a schematic block diagram of a network device according to another embodiment of the present application.

[0028] FIG. 9 is a schematic block diagram of an apparatus for communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Communication system

[0030] The technical solutions in the present application will be described below with reference to the drawings. In order to facilitate understanding, first, the communication terms and communication processes that may be involved in the embodiments of the present application will be introduced with reference to Fig. 1.

[0031] Fig. 1 is a wireless communication system 100 to which the embodiments of the present application are applied. The wireless communication system 100 can include a network device 110 and a terminal device 120. The network device 110 can provide communication coverage for a specific geographical area and can communicate with the terminal device 120 located in the coverage area.

[0032] Fig. 1 exemplarily shows one network device 110 and two terminal devices 120. Alternatively, the wireless communication system 100 can include a plurality of network devices 100, and each network device 100 can include other numbers of terminal devices 110 within its coverage. In addition, the wireless communication system 100 can also include other network entities such as a network controller, a mobility management entity, etc. alternatively.

[0033] In the embodiments of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent or a user apparatus. The terminal device can be, for example, a device that provides voice and / or data connectivity for a user in a communication network, and can be used for connecting people, things and machines, such as household appliances, sensors, electronic tags, etc. with wireless connection function. The terminal device can also be a wireless terminal in a smart home, a wireless terminal in an IWSN, a wireless terminal in smart logistics and smart warehousing, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, etc.

[0034] The network device can be a device for communicating with the terminal device. The network device can also be an access network device or a radio access network device, for example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node or device that accesses the terminal device to the wireless network. The base station can broadly cover various names in the following or can be replaced by the following names, for example: node B (NodeB), evolved node B (eNB), next generation node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), auxiliary station (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), centralized unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes the function of a base station in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, network side device in 6G network, device that undertakes the function of a base station in future communication system, etc. The base station can support the network of the same or different access technology. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0035] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to act as a device that communicates with another base station.

[0036] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on airplanes, balloons and satellites in the air. The scene in which the network device and the terminal device are located is not limited in the embodiments of the present application.

[0037] In some deployments, the network device can refer to a CU or a DU; or the network device includes a CU and a DU. Optionally, the gNB can include an AAU.

[0038] It should be understood that all or part of the functions of the communication device in the present application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform, such as a cloud platform.

[0039] Carrier aggregation

[0040] Carrier aggregation (CA) is a technology to improve the data transmission rate of a wireless communication system. By combining multiple carrier frequency spectrum resources, the total bandwidth is increased to increase the peak data rate of users in uplink and downlink. CA can be used in scenarios involving same frequency bands and different frequency bands. In same frequency band CA, component carriers (CCs) belonging to the same frequency band are aggregated together, where the frequency band can be one of FR1 frequency band or FR2 frequency band. In different frequency band CA, CCs belonging to different frequency bands are aggregated together, where the different frequency bands can include FR1 frequency band and FR2 frequency band, etc.

[0041] CA allows two or more adjacent or non-adjacent CCs to be aggregated to form a wider bandwidth resource, which is collectively used for data scheduling for users. For example, if each carrier bandwidth is 20MHz, by aggregating 5 such carriers, a bandwidth of 100MHz can be obtained, thereby significantly improving the data transmission rate. CA can be classified according to the distribution and combination of spectrum resources, for example, it can include the following types: intra-band contiguous CA, i.e., the aggregated carriers are in the same frequency band and are contiguous; intra-band non-contiguous CA, i.e., the aggregated carriers are in the same frequency band but are not contiguous; inter-band CA, i.e., the aggregated carriers are located in different frequency bands.

[0042] By increasing the effective bandwidth, the data transmission rate of users can be significantly improved, and the system can support more users and higher throughput. CA can effectively utilize scattered spectrum resources and improve the utilization of spectrum resources. In some scenarios, by aggregating carriers of different frequency bands, the coverage performance of the network can be improved.

[0043] The implementation of CA involves multiple technical aspects, such as scheduling and resource management, hardware design and signal processing for multi-carrier support, etc. According to user demand and network conditions, the system using CA dynamically allocates and manages aggregated carriers, and terminal devices and network devices need to support multi-carrier transmission and reception functions.

[0044] In the mobile broadband (MBB) scenario, CA can improve user experience, especially in scenarios with high data rate requirements such as high-definition video streaming, online gaming, etc. In some large-scale Internet of Things (IoT) applications, CA helps to improve network capacity and coverage. In summary, CA provides enterprise users with high-reliability, high-speed wireless network connections.

[0045] SSB

[0046] The SSB plays an important role in the initial access, synchronization and acquisition of broadcast information of the terminal device, such as carrying the cell identity (ID), performing time-frequency synchronization, indicating symbol level / slot level / frame timing, measuring beam signal strength / signal quality, and measuring cell signal strength / signal quality, etc. Among them, the measurement of cell signal strength / signal quality may include, for example, radio resource management (RRM) measurement / channel state information (CSI) measurement, etc. The measurement of beam signal strength / signal quality can be used to perform beam selection, perform beam failure detection, perform beam failure recovery, etc.

[0047] The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), and part or all of a demodulation reference signal (DMRS). The PBCH carries a master information block (MIB), and the MIB information can include a control resource set (CORESET) corresponding to a search space of a physical downlink control channel (PDCCH). The PDCCH is a PDCCH of Type-0 format, which is used to carry a system information block (SIB) 1. The terminal device can determine the PDCCH based on the MIB information, and then acquire the SIB1 on a corresponding physical downlink shared channel (PDSCH) based on the PDCCH. The SIB1 provides key information required by the terminal device in initial access and normal operation, and can ensure that the terminal device correctly synchronizes, selects a suitable cell, performs random access, and acquires basic configuration parameters of the network. Through the SIB1, the terminal device can efficiently communicate with the network device to ensure stable and reliable connection. The SIB1 includes key system information required by the terminal device to access the network, such as public land mobile network (PLMN) information, cell selection information, time and frequency information, access parameters, power control information, cell broadcast information, public alarm information, and other information. Other information includes, for example, cell access restrictions, registration area related information, and the like.

[0048] SSB transmission mode

[0049] In a CA scenario, according to the capability of a terminal device, the system can configure a set of serving cells for the terminal device in a radio resource control (RRC) connected state (RRC_CONNECTED), including a primary cell (PCell) and one or more secondary cells (SCells). The reconfiguration, addition and deletion of the SCells can be performed through RRC signaling. In the system intra-handover or the recovery of the connection from the RRC inactive state (RRC_INACTIVE), the SCells used together with the PCell can be added, deleted, reserved or reconfigured, etc. When a new SCell is added, all the system information required for adding the SCell can be sent through dedicated RRC signaling. Therefore, in the RRC_CONNECTED state, the terminal device does not need to directly obtain the broadcast system information from the SCell. Once the SCell is configured, it can be modified, activated, deactivated or deleted. These management activities of the SCells can be activated or deactivated through RRC signaling or medium access control (MAC) control element (CE) on the PCell, etc.

[0050] Different versions of the standard provide solutions for SCells without transmitting SSBs for intra-band CA and inter-band CA, so that the network device saves a lot of power in the case of low load.

[0051] In the initial access of the terminal device, handover and recovery of the connection from the RRC_INACTIVE state, the SSB can be used for synchronization and measurement. For SCells without transmitting SSBs, the synchronization and measurement on the SCells can rely on the SSB transmitted on the PCell. However, in practical applications, whether it is intra-band CA or inter-band CA, the corresponding base stations of the PCell and the SCell need to be co-located, and the frequency bands used by the PCell and the SCell need to be close. The co-location described here refers to the same or similar address in the physical location, that is, the co-site. At this time, the terminal device can use the time-frequency synchronization obtained from the PCell to demodulate the information on the SCell, and the network device configures the SCell according to the measurement result of the terminal device on the SSB on the PCell. In actual scenarios, the following cases need to support the transmission of SSBs on SCells.

[0052] For example, for a terminal device, the addition of an SCell can occur after initial access, handover, or RRC connection re-establishment, which includes, for example, the terminal device resuming connection from an RRC_INACTIVE state or entering an RRC_CONNECTED state from an RRC idle state (RRC_IDLE), etc. In the case where the terminal device does not measure a reference symbol, such as an SSB, on the SCell, the network device cannot modify or configure the SCell according to the measurement report of the terminal device for the SSB on the SCell, and further, the terminal device cannot perform layer 3 (L3) measurement to reflect the quality of the cell, and can only blindly configure or modify the SCell.

[0053] For example, for a terminal device, the addition of an SCell can occur after initial access, handover, or RRC connection re-establishment, which includes, for example, the terminal device resuming connection from an RRC_INACTIVE state or entering an RRC_CONNECTED state from an RRC idle state (RRC_IDLE), etc. In the case where the terminal device does not measure a reference symbol, such as an SSB, on the SCell, the network device cannot modify or configure the SCell according to the measurement report of the terminal device for the SSB on the SCell, and further, the terminal device cannot perform layer 3 (L3) measurement to reflect the quality of the cell, and can only blindly configure or modify the SCell.

[0054] Therefore, in the case where the base stations corresponding to the PCell and the SCell are not co-located, the terminal device cannot measure the SCell using the measurement result of the PCell. When the terminal device performs initial access, handover, or re-establishes an RRC connection, if the terminal device does not have a measurement result of the SCell, the terminal device cannot perform L3 measurement to obtain a more accurate measurement result regarding cell measurement. If the SCell is blindly added or the configuration information of the SCell is blindly modified, such as modification of the beam direction of the SCell, a lower quality channel can be configured for the terminal device, causing continuous retransmission of information and resulting in waste of resources. For the network device, when the location of the terminal device moves, the network device cannot know that the SCell channel configured for the terminal device is of low quality. In the case where no reference symbol, such as an SSB, is transmitted on the SCell of the terminal device, the terminal device and the network device cannot obtain a measurement result for the cell.

[0055] To this end, in the CA scenario, when the network device adds an SCell for the terminal device, the SSB can be configured to be transmitted in the SCell. Transmitting the SSB on the SCell can help the terminal device to discover and synchronize to the SCell, effectively improve the network capacity, improve the user experience, and increase the probability of the terminal device discovering the SCell. Transmitting the SSB on the SCell can enhance the signal coverage of the SCell, making it easier for the terminal device to discover the SCell, thereby reducing the occurrence of disconnection and handover. The SSB can help the terminal device to quickly synchronize to the SCell, reduce the delay of RRC connection establishment, thereby improving the data transmission efficiency, and also enable more terminal devices to access the SCell, thereby improving the network capacity and alleviating congestion.

[0056] It can be seen that the SSB is crucial for the terminal device to detect and synchronize to a cell in a cellular network. The SSB can provide the basic system information required by the terminal device to initiate communication. In the SCell, the SSB transmission can be used by the user equipment for the following cases, such as time / frequency synchronization of the SCell, RRM measurement of layer 1 (L1) and L3, and activation of the SCell. Of course, since the transmission of the SSB needs to occupy a certain wireless resource, it will increase the power consumption of the network device and increase the interference between cells, affecting the network performance.

[0057] The network device can periodically transmit the SSB for the terminal device to keep synchronization with the network device or the serving cell or perform cell measurement. For the terminal device, since it cannot be guaranteed that the SSB transmitted on the SCell each time is effectively utilized, it may cause waste of resources.

[0058] To this end, on-demand SSB is proposed. Unlike the periodically transmitted SSB, the on-demand SSB is only transmitted within a period of time. For example, the on-demand SSB can include two cases, one is that the network device transmits the SSB within a period of time for the terminal device to perform SSB detection, and the network device can indicate the information of the period of time to the terminal device through control signaling such as RRC signaling or / MAC CE; the other is that the terminal device requests the SSB from the network device on demand, and the network device can transmit the SSB based on the request of the terminal device. In this way, the waste of resources can be reduced.

[0059] In the next generation wireless system (NR), SSBs can include two types, i.e., cell-defined SSB (CD SSB) and non-cell defined SSB (NCD SSB). One of the important differences between CD SSB and NCD SSB is whether it is used to acquire system information. Among them, CD SSB is usually used to acquire system information, the MIB information in the PBCH of CD SSB includes the CORESET information corresponding to the search space of the PDCCH used to acquire SIB1, so that the terminal device can acquire SIB1 based on the CD SSB. The MIB information in the PBCH of NCD SSB does not carry the information of the PDCCH carrying SIB1, so the terminal device cannot acquire system information through NCD SSB. The main role of NCD SSB is to enhance interference cancellation and robustness, for example, the strength of the interference signal can be obtained by measuring PSS and SSS, and NCD SSB can provide timing and synchronization reference to facilitate the terminal device to correctly receive and demodulate the signal from the network device, and NCD SSB is not used to transmit system information. In addition, CD SSB needs to be transmitted on the synchronization raster, and NCD SSB does not require transmission on the synchronization raster, that is, NCD SSB can be transmitted on the synchronization raster or not.

[0060] In lower versions of the standard, for example, Release 18 and earlier versions of the NR system, SSBs are periodically transmitted, and when the parameters of the SSBs, such as the period, are modified, the network device will notify the terminal device through broadcast signaling. For lower version terminal devices, they do not support the detection of on-demand SSBs. Since on-demand SSBs need to be transmitted for a period of time, when the on-demand SSBs stop transmitting or modify the transmission parameters such as the transmission period, the terminal device cannot be notified through traditional signaling, or the terminal device cannot identify the content about the SSB transmission period in the traditional signaling, so the terminal device cannot support on-demand SSBs. Specifically, it can include the following two cases.

[0061] First, for lower version terminal devices, if the SCell of the terminal device is configured not to transmit SSBs, the terminal device is in an RRC_CONNECTED state, and the in-band / inter-band SCell transmits on-demand SSBs for other higher version terminal devices, the lower version terminal device cannot puncture the SSB when performing rate matching when receiving the physical layer PDSCH and physical downlink shared channel (PUSCH), which will cause decoding errors.

[0062] Secondly, for lower version terminal devices, if the SCell of the terminal device is configured to support SSB transmission, when the terminal device is in RRC_IDLE state or RRC_INACTIVE state, the terminal device will not be able to identify the cell if it attempts to search the SCell cell during the period without SSB transmission or when SSB is not triggered, because there is no available SSB to provide the necessary synchronization and system information. However, if the terminal device detects the on-demand SSB after the on-demand SSB is triggered, it can identify the cell and initiate access. Because after the on-demand SSB is triggered, if the on-demand SSB is a CD SSB, the synchronization signals and system information in the CD SSB can support access. However, once the terminal device enters the RRC_CONNECTED state based on the on-demand SSB, after the network device stops transmitting the on-demand SSB, the terminal device can not know that the on-demand SSB has stopped, so as to incorrectly use the on-demand SSB for measurement, thereby causing inaccurate measurement results. Therefore, a possible solution is that once the terminal device enters the RRC_CONNECTED state, the network device can switch the terminal device to other cells before the on-demand SSB transmission stops, to ensure that the terminal device remains connected and continuously receives services, thereby being unaffected by the absence of the on-demand SSB.

[0063] However, when a lower version terminal device accesses the network through an on-demand SSB, and the network device switches the terminal device to other cells before the on-demand SSB stops transmitting, the following problems also arise. First, when the on-demand SSB stops transmitting, the network device needs to schedule the terminal device, release resources, and integrate uplink, downlink, and control resources among terminal devices, increasing the scheduling burden of the network device. Secondly, before the on-demand SSB stops, the terminal device that accesses through the on-demand SSB needs to be able to switch to the correct cell, which increases the latency of the on-demand SSB closing, and the cell switching process also causes a certain amount of latency. Finally, when the terminal device switches to a neighboring cell, measurement and reporting are required, and when measurement is performed, the communication of the terminal device can be suspended, affecting the user communication quality, and frequent measurement and switching will consume the power of the terminal device, especially in the NR system, the terminal device needs to scan in all directions, which is time-consuming and energy-consuming.

[0064] Therefore, the embodiments of the present application provide a communication method, whether the SSB transmitted by the network device includes system information or not, the first bit field in the SSB indicates that the SSB is an NCD SSB, so that for terminal devices that do not support on-demand SSBs, they will not incorrectly use SSBs that do not belong to them for access and measurement when receiving on-demand SSBs.

[0065] In addition, for a terminal device supporting on-demand SSB or a terminal device of a higher version, when it is detected that the on-demand SSB is not a real NCD SSB, it is judged whether the SSB is a real NCD SSB according to other manners, and when the SSB is not a real NCD SSB, access is performed through the SSB, thereby shunting access demand to share the access burden of other cells.

[0066] FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application. The method 200 shown in FIG. 2 can be performed by a terminal device and a network device. As shown in FIG. 2, the method 200 includes part or all of the following steps.

[0067] In step 210, the network device sends an SSB to the terminal device.

[0068] Correspondingly, in step 220, the terminal device receives the SSB sent by the network device.

[0069] The SSB is, for example, an on-demand SSB.

[0070] In the related art, the SSB includes a first bit field, the first bit field indicates a CD SSB when the SSB is a CD SSB, and the first bit field indicates an NCD SSB when the SSB is an NCD SSB, wherein the CD SSB carries system information, and the NCD SSB does not carry system information. In the embodiments of the present application, whether the SSB is a CD SSB or an NCD SSB, that is, whether the SSB carries system information or not, the first bit field indicates that the SSB is an NCD SSB.

[0071] The first bit field can be a certain bit in the MIB information carried on the PBCH in the SSB. For example, when the bit is 1, it indicates that the SSB is a CD SSB, and when the bit is 0, it indicates that the SSB is a CD SSB; or, when the bit is 0, it indicates that the SSB is a CD SSB, and when the bit is 1, it indicates that the SSB is a CD SSB.

[0072] That is, the SSB in steps 210 and 220 can be used to obtain system information of the network device, or in other words, the SSB includes or carries system information, but the first bit field in the SSB is still used to indicate that the SSB is an NCD SSB. The system information can refer to a system information block such as SIB 1, etc.

[0073] Thus, for the terminal device of the lower version which does not support the on-demand SSB, even if it detects the on-demand SSB, since the first bit field of the SSB is used to indicate the NCD SSB, the terminal device will not acquire the system information from the SSB for cell access. Since the terminal device which does not support the on-demand SSB will not access the cell through the on-demand SSB, the problem described above will not occur, avoiding the invalid measurement performed by the terminal device which does not support the on-demand SSB after the on-demand SSB ends transmission but the terminal device does not receive the notification of the SSB transmission stop, considering that the SSB is still transmitting, so as to not affect the traditional user link quality, and the network device does not need to schedule the terminal device to other cells.

[0074] However, for the terminal device of the higher version, for example, the terminal device in the Release 19 and later versions of the NR system, it supports the on-demand SSB. If the first bit field is set to indicate that the SSB is an NCD SSB, the terminal device cannot access through the cell with the on-demand SSB, and all access burdens will be concentrated on other cells, that is, the cell with the on-demand SSB cannot share the access terminal device. Hereinafter, the terminal device in the scheme described below can refer to the terminal device of the higher version, that is, the terminal device which supports the on-demand SSB.

[0075] Therefore, in some implementation manners, the SSB further includes a second bit field, and the second bit field is used to indicate whether the terminal device acquires the system information through the SSB. In the case that the second bit field indicates that the terminal device acquires the system information through the SSB, the terminal device acquires the system information through the SSB.

[0076] That is, when the terminal device receives the SSB, since the first bit field of the SSB indicates that the SSB is an NCD SSB, at this time, if the terminal device is a terminal device which supports the on-demand SSB, the terminal device can further judge whether the SSB is a true NCD SSB or a false NCD SSB according to the second bit field, that is, whether there is corresponding system information on the SSB, or whether the terminal device can acquire the system information through the SSB. If it is judged that the SSB is a true NCD SSB based on the second bit field, the terminal device can not acquire the system information such as SIB1 from the SSB, and if it is judged that the SSB is a false NCD SSB based on the second bit field, the terminal device acquires the system information such as SIB1 from the SSB.

[0077] In the related art, in the case that the first bit field of the SSB indicates that the SSB is a CDS SSB, there is a bit field in the MIB information indicating the detailed information of the CORESET corresponding to the common search space of the PDCCH in Type-0 format, which is used to carry system information such as SIB1; in the case that the first bit field of the SSB indicates that the SSB is a NCD SSB, the bit field in the MIB information can indicate the beam information of the SSB, for example, the detailed information of the SSB burst pattern.

[0078] The second bit field in the embodiments of the present application can be a bit field formed by some bit positions in the MIB information carried on the PBCH in the SSB. For example, the second bit field can be a bit field in the MIB information for indicating the CORESET information or the SSB beam information. Generally, in the case that the first bit field of the SSB indicates that the SSB is a CDS SSB and a NCD SSB, the content indicated by the second bit field is different, while in the embodiments of the present application, in some implementation manners, the second bit field carries first information, which is associated with the characteristics of the SSB itself, for example, the first information is associated with the number of SSBs in the SSB burst.

[0079] That is to say, no matter whether the first bit field indicates that the NCD SSB is a true NCD SSB or a false NCD SSB when the first bit field indicates that the SSB is a NCD SSB, the content indicated by the second bit field is the same, for example, the second bit field includes first information related to the number of SSBs. The first information is, for example, the pattern information of the SSB burst.

[0080] A cell usually needs to send multiple SSBs to complete a beam sweep, so that the SSBs cover the entire service range of the cell. The SSBs needed to complete a beam sweep form an SSB burst. The SSB burst pattern describes the transmission configuration of the SSB burst in time, frequency or space. For example, as shown in FIG. 3, the SSB beam sweep and the SSB burst transmission time are shown. In FIG. 3, (a) shows the spatial beams for transmitting each SSB, and (b) shows the time corresponding to transmitting each SSB. Under different frequency bands and configurations, the SSB burst pattern may be different. For example, under different frequency bands, the maximum number of SSBs that can be included in an SSB burst can be 4, 8 and 64. FIG. 3 takes an SSB burst including 8 SSBs, i.e., SSB 0 to SSB 7, as an example.

[0081] In the case that the on-demand SSB is for certain terminal devices, which need the SSB according to actual situation, the network device sends the on-demand SSB for the terminal devices, in this case, the SSB can be sent in only a few directions, or even in only one direction. Therefore, by the number of SSBs in the SSB burst set, the terminal device can roughly judge whether the system information needs to be acquired through the SSB.

[0082] In some implementations, the second bit field includes one or more first bit positions, and the value of the first bit position is a first value, and the number of the first bit positions is used to indicate whether the terminal device acquires the system information through the SSB.

[0083] In the second bit field, the first bit position refers to a type of bit position with a first value among the plurality of bit positions, and the first value can be 0 or 1, for example. Assuming that 0 represents no transmission of SSB, and 1 represents transmission of SSB. Taking 1 as the first value as an example, when the value of a bit position in the second bit field is 1, it indicates that the SSB corresponding to the bit position is transmitted, and when the value of a bit position in the second bit field is 0, it indicates that the SSB corresponding to the bit position is not transmitted, and the number of first bit positions with the value of 1 can be used to determine the number of SSBs.

[0084] For example, in the case that the number of first bit positions is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information such as SIB1 through the SSB; and / or, in the case that the number of first bit positions is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information such as SIB1 through the SSB. Optionally, the second value is pre-agreed, for example, specified in a standard, or the second value can be sent through high-layer signaling such as RRC signaling or MAC CE. Optionally, the second value can be less than the maximum number of SSBs in the SSB burst set.

[0085] In the case that the terminal device supporting the on-demand SSB detects the SSB, and the actual number of transmitted SSBs represented by the second bit field of the MIB information carried on the PBCH in the SSB is less than a second value, i.e., the number of first bit positions is less than the second value, the terminal device considers the SSB as a false NCD SSB, and thus can acquire the system information through the SSB; in the case that the actual number of transmitted SSBs represented by the second bit field is greater than or equal to the second value, i.e., the number of first bit positions is greater than or equal to the second value, the terminal device considers the SSB as a true NCD SSB, and thus does not need to acquire the system information through the SSB.

[0086] For example, taking the case shown in FIG. 3 as an example, assuming that the second value is 4, the second bit field includes 8 bits, which correspond to SSB 0 to SSB 7 in FIG. 3 in sequence, if the values of the 8 bits are 0000 0011 respectively, the number of first bits with a value of 1 is 2, that is, the number of SSBs is 2, which are SSB 6 and SSB 7 respectively. Since the number of first bits is 2, which is less than the second value 4, the terminal device can consider that the SSB is a false NCD SSB, and the terminal device can acquire SIB 1 on the PDCCH through the CORESET information corresponding to the common search space of the PDCCH indicated by the MIB information carried on the PBCH in the SSB.

[0087] In some implementations, the second value can be determined based on second information, and the second information is associated with a frequency band, that is, the second information is frequency band related information. For example, the second information can include one or more of the following information: a frequency band of the cell, a subcarrier spacing, and a maximum number of SSBs in an SSB burst.

[0088] For example, the second information can include a frequency band used by the current cell, and different frequency bands have a corresponding relationship with different values, for example, the smaller the frequency band, the smaller the corresponding value, that is, the smaller the second value; the larger the frequency band, the larger the corresponding value, that is, the larger the second value. Similarly, the second information can include a maximum number of SSBs in an SSB burst, and different maximum numbers of SSBs have a corresponding relationship with different values, for example, the smaller the maximum number of SSBs, the smaller the corresponding value, that is, the smaller the second value; the larger the maximum number of SSBs, the larger the corresponding value, that is, the larger the second value. Alternatively, the second information can include a subcarrier spacing, wherein different subcarrier spacings have a corresponding relationship with different values.

[0089] In addition, the embodiments of the present application can also indicate whether the SSB supports the above-mentioned scheme.

[0090] For example, in some implementations, the second information of the cell where the terminal device is located needs to satisfy a predetermined condition, and the second information is frequency related information, such as including a frequency band of the cell, a subcarrier spacing, or a maximum number of SSBs in an SSB burst.

[0091] That is, the above scheme is bound with the second information, when the second information satisfies the corresponding condition, for example, the frequency band of the cell is certain specific frequency band, then the above scheme is supported, at this time, the first bit field is set to indicate that when the NCD SSB, the terminal device needs to judge whether the NCD SSB indicated by the first bit field is a true NCD SSB or a false NCD SSB. On the contrary, when the second information does not satisfy the corresponding condition, for example, the frequency band of the cell does not belong to the specific frequency band, then the above scheme is not supported, at this time, the first bit field is set to indicate that when the NCD SSB, the terminal device does not need to judge whether the NCD SSB indicated by the first bit field is a true NCD SSB or a false NCD SSB, but directly considers that the SSB is a true NCD SSB, so as not to use the SSB to obtain system information for access and measurement.

[0092] For another example, in some other implementations, the SSB further includes a third bit field, the third bit field is used to indicate whether the above scheme is supported, that is, whether the first bit field in the SSB not including system information is set to indicate the NCD SSB.

[0093] The third bit field can be a certain bit in the MIB information carried on the PBCH in the SSB, for example, can be a bit originally idle in the MIB information. For example, when the third bit field is 1, it indicates that the above scheme is supported, and when the third bit field is 0, it indicates that the above scheme is not supported; or, when the third bit field is 0, it indicates that the above scheme is supported, and when the third bit field is 1, it indicates that the above scheme is not supported.

[0094] When the third bit field indicates that the above scheme is supported, the first bit field of the SSB including system information is set to indicate the NCD SSB, and the terminal device needs to judge whether the NCD SSB indicated by the first bit field is a true NCD SSB or a false NCD SSB, for example, judges whether the NCD SSB indicated by the first bit field is a true NCD SSB or a false NCD SSB according to the second bit field. On the contrary, when the third bit field indicates that the above scheme is not supported, the first bit field of the SSB including system information is set to indicate the NCD SSB, but the terminal device does not need to judge whether the NCD SSB indicated by the first bit field is a true NCD SSB or a false NCD SSB.

[0095] Since the CD SSB needs to be transmitted on the synchronization raster, and the NCD SSB can be transmitted on the synchronization raster or the non-synchronization raster, optionally, the SSB in the embodiments of the present application can be transmitted on the synchronization raster, that is, the SSB is a SSB transmitted on the synchronization raster. For the SSB transmitted on the non-synchronization raster, the terminal device can process it based on the related art. For example, in the case that the SSB carries system information, the first bit field indicates the CD SSB, and the second bit field indicates the information of the CORESET corresponding to the search space of the PDCCH carrying the system information; in the case that the SSB does not carry system information, the first bit field indicates the NCD SSB, and the second bit field indicates the pattern information of the SSB burst set.

[0096] As described above, since the content indicated by the second bit field is the same regardless of whether the NCD SSB is the true NCD SSB or the false NCD SSB when the first bit field indicates that the SSB is the NCD SSB, for example, the second bit field indicates the pattern information of the SSB burst set. Therefore, when the terminal device determines that the NCD SSB is the false NCD SSB and needs to obtain system information such as SIB1 from the SSB, it needs to know the detailed information of the CORESET corresponding to the search space of the PDCCH carrying the system information. For this purpose, in some implementation manners, the candidate value of the CORESET position corresponding to the search space of the PDCCH carrying the system information can be a preset value. The fixed value can be agreed in advance, for example, specified in the standard, or the fixed value can be sent through high-layer signaling such as RRC signaling or MAC CE.

[0097] The number of candidate values can be one or more. For example, when there is only one candidate value, it can be set as a fixed value, which is equivalent to that the position of the CORESET is fixed; for another example, when there are multiple candidate values, the terminal device can determine the CORESET position corresponding to the system information through blind detection and the like.

[0098] FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present application. The method 600 shown in FIG. 4 can be performed by a terminal device and a network device. As shown in FIG. 2, the method 600 includes part or all of the following steps.

[0099] In step 610, the network device sends an SSB to the terminal device.

[0100] Correspondingly, in step 620, the terminal device receives the SSB sent by the network device.

[0101] The SSB is used to acquire system information of the network device, and the SSB can be a first SSB or a second SSB. The first SSB is transmitted on a synchronization raster, and the second SSB is transmitted on a non-synchronization raster. The formats of the first SSB and the second SSB are different. The format herein can be, for example, rules and conventions that need to be followed when information is transmitted and received, including but not limited to the length of the SSB, the content indicated by the SSB, the information carried, and the like.

[0102] For example, a specific bit field in the first SSB is different from the specific bit field at the same position in the second SSB. For another example, the system information carried by the first SSB is different from the system information carried by the second SSB. For yet another example, the specific bit field in the first SSB is different from the specific bit field in the second SSB, and the system information corresponding to the first SSB is different from the system information corresponding to the second SSB.

[0103] The specific bit field can be, for example, the first bit field and / or the second bit field described above, or other bit fields.

[0104] In some implementations, the first SSB can be the SSB in the method 200 described above, that is, the first bit field of the SSB indicates the NCD SSB regardless of whether the SSB carries system information. The second SSB can be an SSB in the related art, that is, the first bit field indicates the CD SSB when the SSB carries system information, and the first bit field indicates the NCD SSB when the SSB does not carry system information.

[0105] For a terminal device of a lower version that does not support on-demand SSBs, whether the SSB is detected on the synchronization raster or the non-synchronization raster, since the first bit field of the SSB is used to indicate the NCD SSB, the terminal device will not acquire system information using the SSB for cell access. Since the terminal device that does not support on-demand SSBs will not access the cell through the on-demand SSB, invalid measurement performed by the terminal device that does not support on-demand SSBs after accessing the cell through the on-demand SSB and considering that the SSB is still being transmitted because the terminal device does not receive a notification that the transmission of the SSB is stopped is avoided. Therefore, the traditional user link quality is not affected, and the network device does not need to schedule the terminal device to another cell.

[0106] For a terminal device supporting a higher version of on-demand SSB, if an SSB, i.e., a second SSB, is detected on a non-synchronization raster, the terminal device does not need to acquire system information through the SSB when the SSB is an NCD SSB; if an SSB, i.e., a first SSB, is detected on a synchronization raster, the SSB can be a CD SSB or an NCD SSB, a first bit field of the SSB can indicate an NCD SSB, and the terminal device needs to determine whether to acquire system information through the SSB through a second bit field.

[0107] It should be noted that the method 200 and the method 400 described above can be executed alone or in combination, and the corresponding features in the method 200 can also be applied to the method 400.

[0108] The method embodiments of the present application are described in detail above in combination with FIGS. 2 to 4, and the device embodiments of the present application are described in detail below in combination with FIGS. 5 to 9. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, and therefore, the parts not described in detail can be referred to the method embodiments.

[0109] FIG. 5 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 300 shown in FIG. 5 can include a receiving unit 310.

[0110] The receiving unit 310 is configured to receive an SSB transmitted by a network device, the SSB being used to acquire system information of the network device, wherein the SSB includes a first bit field, and the first bit field is used to indicate that the SSB is an NCD SSB.

[0111] In some implementations, the SSB further includes a second bit field, and the second bit field is used to indicate whether the terminal device acquires the system information through the SSB.

[0112] In some implementations, the second bit field carries first information, and the first information is associated with a number of SSBs.

[0113] In some implementations, the first information includes pattern information of an SSB burst set.

[0114] In some implementations, the second bit field includes one or more first bit positions, a value of the first bit position is a first value, and a number of the first bit positions is used to indicate whether the terminal device acquires the system information through the SSB.

[0115] In some embodiments, when the number of the first bit is less than a second value, the second bit field is used to instruct the terminal device to acquire the system information through the SSB; and / or when the number of the first bit is greater than or equal to the second value, the second bit field is used to instruct the terminal device not to acquire the system information through the SSB.

[0116] In some embodiments, the second value is predetermined or is sent through high-layer signaling.

[0117] In some embodiments, the second value is determined based on second information associated with a frequency band.

[0118] In some embodiments, the second information includes one or more of the following: a frequency band of a cell; a subcarrier spacing; a maximum number of SSBs in an SSB burst.

[0119] In some embodiments, second information of a cell where the terminal device is located satisfies a predetermined condition, and the second information is associated with a frequency band.

[0120] In some embodiments, the SSB further includes a third bit field, which is used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB is supported.

[0121] In some embodiments, the SSB is an on-demand SSB, and the terminal device is an on-demand SSB-enabled terminal device.

[0122] In some embodiments, the SSB is transmitted on a synchronization raster.

[0123] In some embodiments, a candidate value of a CORESET location corresponding to a search space of a PDCCH carrying the system information is a preset value.

[0124] In some embodiments, the system information includes SIB1.

[0125] FIG. 6 is a schematic diagram of a network device according to an embodiment of the present application. The network device 400 shown in FIG. 6 includes a sending unit 410.

[0126] The sending unit 410 is configured to send a synchronization signal broadcast channel block (SSB) to a terminal device, where the SSB is used to acquire system information of the network device, and the SSB includes a first bit field, where the first bit field is used to indicate that the SSB is a non-cell-defined synchronization signal broadcast channel block (NCD SSB).

[0127] In some embodiments, the SSB further comprises a second bit field, the second bit field being used to indicate whether the terminal device acquires the system information via the SSB.

[0128] In some embodiments, the second bit field carries first information, the first information being associated with a number of SSBs.

[0129] In some embodiments, the first information comprises pattern information of a SSB burst set.

[0130] In some embodiments, the second bit field comprises one or more first bits, a value of the first bits being a first value, a number of the first bits being used to indicate whether the terminal device acquires the system information via the SSB.

[0131] In some embodiments, in a case that the number of the first bits is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information via the SSB; and / or, in a case that the number of the first bits is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information via the SSB.

[0132] In some embodiments, the second value is pre-agreed or sent via higher layer signaling.

[0133] In some embodiments, the second value is determined based on second information, the second information being associated with a frequency range.

[0134] In some embodiments, the second information comprises one or more of the following: a frequency range of a cell; a subcarrier spacing; a maximum number of SSBs in a SSB burst set.

[0135] In some embodiments, second information of a cell in which the terminal device is located satisfies a predetermined condition, the second information being associated with a frequency range.

[0136] In some embodiments, the SSB further comprises a third bit field, the third bit field being used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB is supported.

[0137] In some embodiments, the SSB is an on-demand SSB, and the terminal device is an on-demand SSB-capable terminal device.

[0138] In some embodiments, the SSB is transmitted on a synchronization raster.

[0139] In some embodiments, a candidate value of a CORESET location corresponding to a search space of the PDCCH carrying the system information is a preset value.

[0140] In some embodiments, the system information comprises a SIB1.

[0141] It can be understood that the receiving unit 310 may, for example, be a transceiver 530. In addition, the terminal device 300 may, for example, further include a processor 510 and a memory 520, as shown in FIG. 9.

[0142] Similarly, the sending unit 410 may, for example, be a transceiver 530. In addition, the network device 400 may, for example, further include a processor 510 and a memory 520, as shown in FIG. 9.

[0143] FIG. 7 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 300 shown in FIG. 7 may, for example, include a receiving unit 710. The receiving unit 710 may, for example, be configured to receive an SSB transmitted by a network device, the SSB being a first SSB or a second SSB. The first SSB may, for example, be transmitted on a synchronization raster, and the second SSB may, for example, be transmitted on a non-synchronization raster. The first SSB and the second SSB may, for example, be different in format.

[0144] In some embodiments, the first SSB and the second SSB are different in format, including that a specific bit field in the first SSB is different from the specific bit field in the second SSB, and / or system information corresponding to the first SSB is different from system information corresponding to the second SSB.

[0145] FIG. 8 is a schematic diagram of a network device according to an embodiment of the present application. The network device 800 shown in FIG. 8 may, for example, include a sending unit 810. The sending unit 810 may, for example, be configured to send an SSB to a terminal device, the SSB being a first SSB or a second SSB. The first SSB may, for example, be transmitted on a synchronization raster, and the second SSB may, for example, be transmitted on a non-synchronization raster. The first SSB and the second SSB may, for example, be different in format.

[0146] In some embodiments, the first SSB and the second SSB are different in format, including that a specific bit field in the first SSB is different from the specific bit field in the second SSB, and / or system information corresponding to the first SSB is different from system information corresponding to the second SSB.

[0147] It can be understood that the receiving unit 710 may, for example, be a transceiver 530. In addition, the terminal device 300 may, for example, further include a processor 510 and a memory 520, as shown in FIG. 9.

[0148] Similarly, the sending unit 810 can be, for example, the transceiver 530. In addition, the network device 400 can further include the processor 510 and the memory 520, as shown in FIG. 9.

[0149] FIG. 9 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present application. The dashed line in FIG. 9 indicates that the unit or module is optional. The apparatus can be used to implement the method described in the above method embodiments. The apparatus can be, for example, a chip, a terminal device, or a network device.

[0150] As shown in FIG. 9, the apparatus 500 can include one or more processors 510. The processor 510 can support the apparatus 500 to implement the method described in the above method embodiments. The processor 510 can be a general purpose processor or a dedicated processor. For example, the processor 510 can be a central processing unit (CPU). Alternatively, the processor 510 can also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0151] The apparatus 500 can further include one or more memories 520. The memory 520 stores a program, which can be executed by the processor 510, so that the processor 510 performs the method described in the above method embodiments. The memory 520 can be independent of the processor 510 or integrated in the processor 510.

[0152] The apparatus 500 can further include a transceiver 530. The processor 510 can communicate with other devices or chips through the transceiver 530. For example, the processor 510 can perform data transceiving with other devices or chips through the transceiver 530.

[0153] Embodiments of the present application provide a communication system. The system includes the terminal device and / or the network device described above. In some implementations, the system further includes other devices that interact with the terminal device and / or the network device.

[0154] The embodiment of the present application further provides a computer readable storage medium for storing a program. The computer readable storage medium can be applied to the terminal or the network device provided by the embodiment of the present application, and the program causes the computer to execute the method performed by the terminal device or the network device in the various embodiments of the present application.

[0155] The embodiment of the present application further provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or the network device provided by the embodiment of the present application, and the program causes the computer to execute the method performed by the terminal device or the network device in the various embodiments of the present application.

[0156] The embodiment of the present application further provides a computer program. The computer program can be applied to the terminal or the network device provided by the embodiment of the present application, and the computer program causes the computer to execute the method performed by the terminal device or the network device in the various embodiments of the present application.

[0157] It should be understood that the terms "system" and "network" can be used interchangeably in the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0158] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained by A, for example, B can be obtained by A; or it can mean that A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or it can mean that A and B have an associated relationship.

[0159] In the embodiments of the present application, "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 that B is determined only according to A, but B can also be determined according to A and / or other information.

[0160] In the embodiments of the present application, the term "corresponding" can mean that there is a direct or indirect corresponding relationship between the two, or it can mean that there is an associated relationship between the two, or it can mean an indication and being indicated, configuration and being configured, and the like.

[0161] In the embodiments of the present application, the "predefined" or "preconfigured" can be realized by pre-storing corresponding codes, tables or other manners that can be used to indicate related information in devices, for example, terminal devices and network devices. The specific implementation manners are not limited in the present application. For example, the predefinition can refer to the definition in a protocol.

[0162] In the embodiments of the present application, the term "and / or" is only used to describe the association relationship of the associated objects, that is, there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0163] In the embodiments of the present application, the "including" can mean direct or indirect including. Alternatively, the "including" mentioned in the embodiments of the present application can be replaced by "indicating" or "used for determining". For example, A includes B can be replaced by A indicates B or A is used for determining B.

[0164] In various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0165] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can be in another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0166] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0167] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0168] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media sets. The available media can be magnetic media such as floppy disk, hard disk, magnetic tape, etc., or optical media such as digital video disc (DVD), or semiconductor media such as solid state disk (SSD), etc.

[0169] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: The terminal device receives a synchronization signal broadcast channel block (SSB) sent by a network device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is a non-cell-defined synchronization signal broadcast channel block (NCD SSB). The SSB further comprises a second bit field, and the second bit field is used to indicate whether the terminal device acquires the system information through the SSB.

2. The method of claim 1, wherein, The second bit field carries first information, and the first information is associated with a number of SSBs.

3. The method of claim 2, wherein, The first information comprises pattern information of an SSB burst set.

4. The method according to claim 2 or 3, characterized in that, The second bit field comprises one or more first bit positions, the value of the first bit position is a first value, and the number of the first bit positions is used to indicate whether the terminal device acquires the system information through the SSB.

5. The method according to any one of claims 2 to 4, characterized in that, 6. The method of claim 5, wherein, in a case where the number of the first bit positions is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information through the SSB; and / or in a case where the number of the first bit positions is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information through the SSB. The second value is predetermined or sent through high-layer signaling. The second value is determined based on second information, and the second information is associated with a frequency range.

7. The method of claim 6, wherein, The second information comprises one or more of the following information:

8. The method according to claim 6 or 7, characterized in that, a frequency range of a cell; 9. The method of claim 8, wherein, a subcarrier spacing; a maximum number of SSBs in an SSB burst set. The second information associated with the frequency range of the cell in which the terminal device is located satisfies a predetermined condition. The SSB further comprises a third bit field, and the third bit field is used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB.

10. The method according to any one of claims 1 to 9, characterized in that, The SSB is an on-demand SSB, and the terminal device is an on-demand SSB-enabled terminal device.

11. The method according to any one of claims 1 to 10, characterized in that, The SSB is transmitted on a synchronization raster.

12. The method according to any one of claims 1 to 11, characterized in that, A candidate value of a control resource set (CORESET) location corresponding to a search space of a physical downlink control channel (PDCCH) carrying the system information is a preset value.

13. The method according to any one of claims 1 to 12, characterized in that, The terminal device receives a synchronization signal broadcast channel block (SSB) sent by a network device, the SSB being a first SSB or 14. The method according to any one of claims 1 to 13, characterized in that, a second SSB; 15. A method of communication, comprising: wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and the formats of the first SSB and the second SSB are different. The formats of the first SSB and the second SSB are different, including: a specific bit field in the first SSB is different from the specific bit field in the second SSB; and / or system information corresponding to the first SSB is different from system information corresponding to the second SSB.

16. The method of claim 15, wherein, The terminal device receives a synchronization signal broadcast channel block (SSB) sent by a network device, the SSB being a first SSB or ​ ​ 17. A method of communication, comprising: ​ The network device transmits a synchronization signal broadcast channel block (SSB) to a terminal device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, the first bit field being used to indicate that the SSB is a non-cell defined synchronization signal broadcast channel block (NCD SSB).

18. The method of claim 17, wherein, The SSB further comprises a second bit field, the second bit field being used to indicate whether the terminal device acquires the system information through the SSB.

19. The method of claim 18, wherein, The second bit field carries first information, the first information being associated with a number of SSBs.

20. The method of claim 18 or 19, wherein, The first information comprises pattern information of a SSB burst set.

21. The method of any one of claims 18-20, wherein, The second bit field comprises one or more first bit positions, a value of the first bit position being a first value, and a number of the first bit positions being used to indicate whether the terminal device acquires the system information through the SSB.

22. The method of claim 21, wherein, in a case where the number of the first bit positions is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information through the SSB; and / or in a case where the number of the first bit positions is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information through the SSB. The second value is predetermined or is transmitted through high-layer signaling.

23. The method of claim 22, wherein, The second value is determined based on second information, the second information being associated with a frequency range.

24. The method of claim 22 or 23, wherein, The second information comprises one or more of the following:

25. The method of claim 24, wherein, a frequency range of a cell; a subcarrier spacing; a maximum number of SSBs in a SSB burst set. The second information associated with the frequency range of the cell in which the terminal device is located satisfies a predetermined condition.

26. The method of any one of claims 17-25, wherein, The SSB further comprises a third bit field, the third bit field being used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB.

27. The method of any one of claims 17-26, wherein, The SSB is an on-demand SSB, and the terminal device is an on-demand SSB-enabled terminal device.

28. The method of any one of claims 17-27, wherein, The SSB is transmitted on a synchronization raster.

29. The method of any one of claims 17-28, wherein, A candidate value of a control resource set (CORESET) location corresponding to a search space of a physical downlink control channel (PDCCH) carrying the system information is a preset value.

30. The method of any one of claims 17-29, wherein, The SSB is one of a first SSB or a second SSB.

31. A method of communication, comprising: The first SSB is transmitted on a synchronization raster, and the second SSB is transmitted on a non-synchronization raster. The formats of the first SSB and the second SSB are different, including: a specific bit field in the first SSB is different from the specific bit field in the second SSB; and / or 32. The method of claim 31, wherein, system information corresponding to the first SSB is different from system information corresponding to the second SSB. The SSB is one of a first SSB or a second SSB. ​ 33. A terminal device, comprising: ​ The receiving unit is configured to receive a synchronization signal broadcast channel block (SSB) sent by a network device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is a non-cell defined synchronization signal broadcast channel block (NCD SSB).

34. The terminal device of claim 33, wherein, The SSB further comprises a second bit field, and the second bit field is used to indicate whether the terminal device acquires the system information through the SSB.

35. The terminal device of claim 34, wherein, The second bit field carries first information, and the first information is associated with a quantity of SSBs.

36. The terminal device of claim 33 or 34, wherein, The first information comprises pattern information of an SSB burst set.

37. The terminal device of any one of claims 33 to 36, wherein, The second bit field comprises one or more first bit positions, a value of the first bit position is a first value, and a quantity of the first bit positions is used to indicate whether the terminal device acquires the system information through the SSB.

38. The terminal device of claim 37, wherein, in a case where the quantity of the first bit positions is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information through the SSB; and / or in a case where the quantity of the first bit positions is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information through the SSB. The second value is predetermined or sent through high-layer signaling.

39. The terminal device of claim 38, wherein, The second value is determined based on second information, and the second information is associated with a frequency range.

40. The terminal device of claim 38 or 39, wherein, The second information comprises one or more of the following information:

41. The terminal device of claim 40, wherein, a frequency range of a cell; a subcarrier spacing; a maximum quantity of SSBs in an SSB burst set. Second information of a cell in which the terminal device is located satisfies a predetermined condition, and the second information is associated with a frequency range.

42. The terminal device of any one of claims 33 to 41, wherein, The SSB further comprises a third bit field, and the third bit field is used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB.

43. The terminal device of any one of claims 33 to 42, wherein, The SSB is an on-demand SSB, and the terminal device is an on-demand SSB supporting terminal device.

44. The terminal device of any one of claims 33 to 43, wherein, The SSB is transmitted on a synchronization raster.

45. The terminal device of any one of claims 33 to 44, wherein, A candidate value of a control resource set (CORESET) location corresponding to a search space of a physical downlink control channel (PDCCH) carrying the system information is a preset value.

46. The terminal device of any one of claims 33 to 45, wherein, The SSB comprises:

47. A terminal device, comprising: a receiving unit configured to receive a synchronization signal broadcast channel block (SSB) sent by a network device, the SSB being a first SSB or a second SSB; wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and formats of the first SSB and the second SSB are different. The formats of the first SSB and the second SSB are different, including:

48. The terminal device of claim 47, wherein, a specific bit field in the first SSB is different from the specific bit field in the second SSB; and / or system information corresponding to the first SSB is different from system information corresponding to the second SSB. The SSB comprises:

49. A network device, comprising: ​ The sending unit is configured to send a synchronization signal broadcast channel block (SSB) to a terminal device, the SSB being used to acquire system information of the network device, wherein the SSB comprises a first bit field, and the first bit field is used to indicate that the SSB is a non-cell-defined synchronization signal broadcast channel block (NCD SSB).

50. The network device of claim 49, wherein, The SSB further comprises a second bit field, and the second bit field is used to indicate whether the terminal device acquires the system information through the SSB.

51. The network device of claim 50, wherein, The second bit field carries first information, and the first information is associated with a quantity of SSBs.

52. The network device of claim 50 or 51, wherein, The first information comprises pattern information of an SSB burst set.

53. The network device of any of claims 50-52, wherein, The second bit field comprises one or more first bit positions, a value of the first bit position is a first value, and a quantity of the first bit positions is used to indicate whether the terminal device acquires the system information through the SSB.

54. The network device of claim 53, wherein, in a case where the quantity of the first bit positions is less than a second value, the second bit field is used to indicate that the terminal device acquires the system information through the SSB; and / or in a case where the quantity of the first bit positions is greater than or equal to the second value, the second bit field is used to indicate that the terminal device does not acquire the system information through the SSB. The second value is predetermined or is sent through high-layer signaling.

55. The network device of claim 54, wherein, The second value is determined based on second information, and the second information is associated with a frequency range.

56. The network device of claim 54 or 55, wherein, The second information comprises one or more of the following information:

57. The network device of claim 56, wherein, a frequency range of a cell; a subcarrier spacing; a maximum quantity of SSBs in an SSB burst set. Second information of a cell in which the terminal device is located satisfies a predetermined condition, and the second information is associated with a frequency range.

58. The network device according to any of claims 49-57, wherein, The SSB further comprises a third bit field, and the third bit field is used to indicate whether the first bit field of the SSB is set to indicate the NCD SSB. 59.The network device according to any one of claims 49-58, characterized by, The SSB is an on-demand SSB, and the terminal device is an on-demand SSB-enabled terminal device. 60.The network device according to any one of claims 49-59, wherein, The SSB is transmitted on a synchronization raster.

61. The network device according to any of claims 49-60, wherein, A candidate value of a control resource set (CORESET) location corresponding to a search space of a physical downlink control channel (PDCCH) carrying the system information is a preset value.

62. The network device according to any of claims 49-61, wherein, The SSB comprises: 63.A network device, characterized by, a sending unit configured to send a synchronization signal broadcast channel block (SSB) to a terminal device, the SSB being a first SSB or a second SSB; wherein the first SSB is transmitted on a synchronization raster, the second SSB is transmitted on a non-synchronization raster, and formats of the first SSB and the second SSB are different. The formats of the first SSB and the second SSB are different, including:

64. The network device of claim 63, wherein, a specific bit field in the first SSB is different from the specific bit field in the second SSB; and / or system information corresponding to the first SSB is different from system information corresponding to the second SSB. ​ 65. A communications device, characterized by A communication device comprising a transceiver, a memory for storing a program, and a processor for invoking the program in the memory and controlling the transceiver to receive or send signals to make the communication device perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

66. An apparatus, comprising: A device comprising a processor for invoking a program from a memory to make the device perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

67. A chip, comprising: A chip comprising a processor for invoking a program from a memory to make the chip perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

68. A computer-readable storage medium, characterized in that, A computer program product having stored thereon a program which causes a computer to perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

69. A computer program product, characterised in that, A computer program for making a computer perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

70. A computer program, characterized in that, The computer program for making a computer perform the method of any one of claims 1 to 14, or the method of claim 15 or 16, or the method of any one of claims 17 to 30, or the method of claim 31 or 32.

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