Communication method, network device, terminal, communication system, and storage medium

Abstract

Embodiments of the present disclosure provide a communication method, a network device, a terminal, a communication system, and a storage medium. The method is executed by the network device. The method comprises: sending first information to a terminal, wherein the first information is used for indicating: a first cell associated with a synchronization signal block-less secondary cell (SSB-less Scell); and the terminal accessing the SSB-less Scell acquiring, by means of the first cell, time information for time synchronization. Thus, synchronization between a terminal and a network can be realized when an SSB-less Scell does not send an SSB.

Description

Communication method, network device, terminal, communication system and storage medium Technical Field The present disclosure relates to the field of communication technology, and in particular to a communication method, a network device, a terminal, a communication system and a storage medium. Background Art In the field of communication technology, in order to save network energy, the New Radio (NR) supports a secondary cell (SSB-less SCell) with reduced synchronization signal blocks, that is, the secondary cell (Scell) does not send a synchronization signal block (SSB). Summary of the invention When the SSB-less Scell ​​does not send SSB, how to achieve synchronization between the terminal and the network is an issue that needs to be considered. Embodiments of the present disclosure provide a communication method, a network device, a terminal, a communication system, and a storage medium. According to a first aspect of an embodiment of the present disclosure, a communication method is provided, the method being executed by a network device, the method comprising: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. According to a second aspect of an embodiment of the present disclosure, a communication method is provided, the method being executed by a terminal, the method comprising: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization. According to a third aspect of an embodiment of the present disclosure, a communication method is provided, the method comprising: The network device sends first information to the terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, the network device comprising: The transceiver module is configured as follows: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. According to a fifth aspect of an embodiment of the present disclosure, a terminal is provided, the terminal including: The processing module is configured as follows: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization. According to the sixth aspect of an embodiment of the present disclosure, a communication system is provided, wherein the communication system includes a network device and a terminal; the network device is configured to implement the method described in the first aspect, and the terminal is configured to implement the method described in the second aspect. According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, the network device comprising: one or more processors; The network device is used to execute the method described in the first aspect. According to an eighth aspect of an embodiment of the present disclosure, a terminal is provided, the terminal including: one or more processors; The terminal is used to execute the method described in the second aspect. According to a ninth aspect of an embodiment of the present disclosure, a storage medium is provided, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method provided by the first aspect, the second aspect or the third aspect. The technical solution provided by the embodiment of the present disclosure can achieve synchronization between the terminal and the network when the SSB-less Scell ​​does not send the SSB. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention. FIG. 1a is a schematic diagram showing an architecture of a communication system according to an exemplary embodiment; FIG2a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 3a is a schematic flow chart of a communication method according to an exemplary embodiment; FIG4a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 4b is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 5a is a schematic diagram of a communication system according to an exemplary embodiment; Fig. 6a is a schematic diagram showing the structure of a terminal according to an exemplary embodiment; FIG6b is a schematic diagram showing the structure of a network device according to an exemplary embodiment; FIG7a is a schematic structural diagram of a UE according to an exemplary embodiment; Fig. 7b is a schematic structural diagram of a communication device according to an exemplary embodiment. DETAILED DESCRIPTION Embodiments of the present disclosure provide a communication method, a network device, a terminal, a communication system, and a storage medium. In a first aspect, an embodiment of the present disclosure provides a communication method, the method being executed by a network device, the method comprising: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. In the above embodiment, since the first information indicates the first cell associated with the secondary cell SSB-less Scell ​​in which the synchronization signal block is reduced, after the terminal receives the first information, the terminal accessing the SSB-less Scell ​​can obtain time information for time synchronization through the first cell. In this way, time synchronization between the terminal accessing the SSB-less Scell ​​and the network can be achieved. In combination with some embodiments of the first aspect, in some embodiments, sending the first information to the terminal includes: The first information is sent to the terminal through radio resource control RRC signaling. In the above embodiment, the first information may be sent to the terminal via RRC signaling. In combination with some embodiments of the first aspect, in some embodiments, the first cell is configured in units of secondary cells Scells. In the above embodiment, the first cell may be configured for each secondary cell. In combination with some embodiments of the first aspect, in some embodiments, the secondary cell configuration ScellConfig information element IE of the RRC signaling indicates the first cell. In combination with some embodiments of the first aspect, in some embodiments, the first cell is a serving cell in an activated state and / or in a non-dormant state. In combination with some embodiments of the first aspect, in some embodiments, sending the first information to the terminal includes: The first information is sent to the terminal through a media access control MAC control element CE. In the above embodiment, the first information may be sent to the terminal via a media access control MAC control element CE. In combination with some embodiments of the first aspect, in some embodiments, the MAC CE is used to activate an SSB-less Scell. In combination with some embodiments of the first aspect, in some embodiments, the MAC CE is used to activate at least two SSB-less Scells, and each of the at least two SSB-less Scells is associated with a first cell. In combination with some embodiments of the first aspect, in some embodiments, each of the at least two SSB-less Scells is associated with a first cell according to the size relationship of the corresponding SSB-less SCell index. In combination with some embodiments of the first aspect, in some embodiments, the first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index. In a second aspect, an embodiment of the present disclosure provides a communication method, which is executed by a terminal, and the method includes: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization. In combination with some embodiments of the second aspect, in some embodiments, determining, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell includes one of the following: determining that the first information is received, and determining to obtain the time information from the first cell; Determine that the first information is not received, and determine to obtain the time information from the second cell. In combination with some embodiments of the second aspect, in some embodiments, it is determined that the priority of obtaining the time information from the second cell and obtaining the time information from an activated service cell in the same frequency band as the SSB-less Scell ​​is higher than the priority of obtaining the time information from the SpCell. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: Determine to select the second cell, select a service cell that is already activated before the SSB-less SCell is activated as the second cell, or select a cell that is activated at the same time as the SSB-less SCell as the second cell. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: Receive the first information sent by the network device. In combination with some embodiments of the second aspect, in some embodiments, the receiving the first information sent by the network device includes: The first information sent by the network device is received through radio resource control RRC signaling. In combination with some embodiments of the second aspect, in some embodiments, the first cell is configured in units of secondary cells Scells. In combination with some embodiments of the second aspect, in some embodiments, the secondary cell configuration Scell ​​Config information element IE of the RRC signaling indicates the first cell. In combination with some embodiments of the second aspect, in some embodiments, the receiving the first information sent by the network device includes: The first information sent by the network device is received through the media access control MAC control element CE. In combination with some embodiments of the second aspect, in some embodiments, the MAC CE is used to activate an SSB-less Scell. In combination with some embodiments of the second aspect, in some embodiments, the MAC CE is used to activate at least two SSB-less Scells, and each of the at least two SSB-less Scells is associated with a first cell. In combination with some embodiments of the second aspect, in some embodiments, each of the at least two SSB-less Scells is associated with a first cell according to the size relationship of the corresponding SSB-less SCell index. In combination with some embodiments of the second aspect, in some embodiments, the first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index. In combination with some embodiments of the second aspect, in some embodiments, the first cell and the second cell are serving cells in an activated state and / or in a non-dormant state. In combination with some embodiments of the second aspect, in some embodiments, the SSB-less Scell ​​and the first cell are activated through the same MAC CE; the activation processing time for activating the SSB-less Scell ​​includes the sum of the activation processing time for activating the first cell and the first offset duration. In combination with some embodiments of the second aspect, in some embodiments, the first cell is activated before the SSB-less Scell, and the time interval between activating the second cell and activating the SSB-less Scell ​​is a second offset duration. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: Before the SSB-less Scell ​​is activated, the activation state configured or designated as the first cell is maintained. In combination with some embodiments of the second aspect, in some embodiments, an asynchronous Async secondary cell Scell ​​cannot be configured as the SSB-less Scell ​​and / or the first cell. In combination with some embodiments of the second aspect, in some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; and the method further includes: The second cell is determined from the serving cell of the SCell or sPcell in the same frequency band intra-band. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: The activation of the Async Scell ​​is delayed until the second cell is determined. In combination with some embodiments of the second aspect, in some embodiments, the Async Scell ​​is configured as the SSB-less Scell ​​and / or the first cell; the SSB-less Scell ​​and the first cell are in the same frequency band; and the method further includes: The time information is determined based on the configuration information of the carrier aggregation time slot offset ca-SlotOffset of the SSB-less Scell ​​and / or the first cell and the downlink timing information of the first cell. In combination with some embodiments of the second aspect, in some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; and the method further includes: Determine the second cell from a serving cell of an SCell or sPcell in the same frequency band intra-band; It is determined that the second cell is not determined from the serving cell of the SCell or sPcell of the intra-band, and the time information is determined based on the downlink timing information of the sPCell and the configuration information of the ca-SlotOffset of the SSB-less SCell. In a third aspect, an embodiment of the present disclosure provides a communication method, the method comprising: The network device sends first information to the terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. In a fourth aspect, an embodiment of the present disclosure provides a network device, the network device comprising: The transceiver module is configured as follows: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. In a fifth aspect, an embodiment of the present disclosure provides a terminal, the terminal comprising: The processing module is configured as follows: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization. In a sixth aspect, an embodiment of the present disclosure provides that the communication system includes a network device and a terminal; the network device is configured to implement the method described in the first aspect, and the terminal is configured to implement the method described in the second aspect. In a seventh aspect, an embodiment of the present disclosure provides a network device, the network device comprising: one or more processors; Among them, the network device is used to execute the method provided by the first aspect. In an eighth aspect, an embodiment of the present disclosure provides a terminal, the terminal including: one or more processors; The terminal is used to execute the method provided by the second aspect. In a ninth aspect, an embodiment of the present disclosure provides a storage medium, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first aspect and the second aspect. In a tenth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first and second aspects. In an eleventh aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first and second aspects. In a twelfth aspect, an embodiment of the present disclosure provides a chip or a chip system. The chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first and second aspects above. It is understandable that the above network devices, terminals, communication systems, storage media, program products, computer programs, chips or chip systems are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods, which will not be repeated here. The embodiments of the present disclosure provide a communication method, a network device, a terminal, a communication system and a storage medium. In some embodiments, the communication method and the information indication method, the information processing method, the information transmission method and other terms can be replaced with each other, and the communication system, the information processing system and other terms can be replaced with each other. The embodiments of the present disclosure are not exhaustive, but are only illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined, for example, some or all of the steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments. In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships. The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun after the article may be understood as a singular expression or a plural expression. In the embodiments of the present disclosure, “plurality” refers to two or more. In some embodiments, the terms “at least one,” “one or more,” “a plurality of,” “multiple,” etc. may be used interchangeably. In some embodiments, the description methods such as "at least one of A and B", "A and / or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc. may include the following technical solutions according to the situation: in some embodiments, A (execute A independently of B); in some embodiments, B (execute B independently of A); in some embodiments, select execution from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). When there are more A, B, C, etc. The same is true for multiple branches. In some embodiments, the recording method of "A or B" may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). When there are more branches such as A, B, C, etc., the above is also similar. The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute unnecessary restrictions due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields", and the "first" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number, and can be one or more. Taking the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different. In some embodiments, “including A”, “comprising A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A. In some embodiments, terms such as "in response to ...", "in response to determining ...", "in the case of ...", "at the time of ...", "when ...", "if ...", "if ...", etc. can be used interchangeably. In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "no more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other. In some embodiments, devices and equipment may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc. In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc. In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station (radio base station)", "fixed station (fixed station)", and in some embodiments may also be understood as "node (node)", "access point (access point)", "transmission point (TP)", "reception point (reception point, RP)", "transmission and / or reception point (transmission / reception point, TRP)" "panel (panel)", "antenna panel (antenna panel)", "antenna array (antenna array)" "cell (cell)", "macro cell (macro cell)", "small cell (small cell)", "femto cell (femto cell)", "pico cell (pico cell)", "sector (sector)", "cell group (cell group)", "serving cell (serving cell)", "carrier (carrier)", "component carrier (component carrier)", "bandwidth part (bandwidth part, BWP)" and the like. In some embodiments, "terminal" or "terminal device" can be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. In some embodiments, acquisition of data, information, etc. may comply with the laws and regulations of the country where the data is obtained. In some embodiments, data, information, etc. may be obtained with the user's consent. In addition, each element, each row, or each column in the table of the embodiments of the present disclosure may be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns may also be implemented as an independent embodiment. FIG. 1 a is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG. 1 a , a communication system 100 includes a terminal 101 and a network device 102 . In some embodiments, the network device 102 may include at least one of an access network device and a core network device. In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited to these. In some embodiments, the access network device may be, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto. In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure may become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs. In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be referred to as a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this. In some embodiments, the core network device may be a device including one or more network elements, or may be a plurality of devices or a group of devices, each including all or part of the one or more network elements. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC). It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. A person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems. The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG. 1a, or part of the subject, but are not limited thereto. The subjects shown in FIG. 1a are examples, and the communication system may include all or part of the subjects in FIG. 1a, or may include other subjects other than FIG. 1a, and the number and form of the subjects are arbitrary, and the connection relationship between the subjects is an example, and the subjects may be connected or disconnected, and the connection may be in any manner, which may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection. The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine-to-Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), systems using other communication methods, and next-generation systems based on them. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G, etc.) for application. In some embodiments, the main application scenarios of 5G are: enhanced mobile ultra-broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communications (mMTC). eMBB still aims at users to obtain multimedia content, services and data, and its demand is growing rapidly. On the other hand, since eMBB may be deployed in different scenarios, such as indoors, in urban areas, and in rural areas, Their capabilities and requirements vary greatly, so they cannot be generalized and must be analyzed in detail in combination with specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, remote medical operations (surgery), traffic safety, etc. Typical features of mMTC include: high connection density, small data volume, latency-insensitive services, low cost and long service life of modules, etc. R15 introduced 5G technology. The energy consumption of 5G base stations is four times that of LTE base stations, so network energy saving is an important means for operators to reduce the cost of operating 5G systems. In some embodiments, in order to save network energy, R15NR supports SSB-less SCell, that is, the SCell cell does not send SSB, and the UE obtains the time reference for the SCell through the primary cell (Pcell) or SCell. At that time, this operation was only used for intra-band SCell. Here, SSB-less SCell mainly means that the absolute frequency (absoluteFrequency) SSB of the SCell is not configured. In some embodiments, for FrequencyInfoDL configuration, if the field "absoluteFrequencySSB" does not exist, then SSB related parameters should not exist, such as ssb-PositionsInBurst, ssb-periodicityServingCell and subcarrierSpacing in ServingCellConfigCommon IE. If this field does not exist, as in TS 38.213

[0013] As described in clause 4.1, the UE obtains the timing reference from the SpCell or SCell (if applicable). This is only supported if the SCell from which the UE obtains the timing reference is in the same frequency band as the cell from which the UE obtains the timing reference (i.e., the SpCell or SCell, respectively). In some embodiments, for FrequencyInfoDL configuration, for SpCellAdd field, if this FrequencyInfoDL is used for SpCell, this field is mandatory. Otherwise, this field is optional and S is required. In some embodiments, it is further supported to configure an SSB-less SCell in an inter-band scenario, that is, the SSB-less SCell obtains a time reference through an inter-band serving cell. The standard agrees that the network side can indicate a reference cell to obtain a time reference, or there is a default cell as the time reference if the reference cell is not explicitly configured. In some embodiments, no reference cell is configured, and the terminal searches for an intra-band cell as a time reference. In some embodiments, how to configure the reference cell and the default state of the reference cell in the inter-band SSB-less SCell scenario, and how to be compatible with the R15 scenario are not considered. The reference cell needs to be in an activated state, how to constrain the network to control the cell state, and how to support SSB-less cells for asynchronous (Async) carrier aggregation (CA) scenarios need to be clarified. FIG2a is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2a, the present disclosure embodiment relates to a communication method, which is used in a communication system 100, and the method includes: Step S2101: The network device sends first information to the terminal; In some embodiments, the terminal receives first information sent by the network device. In some embodiments, the first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks. In some embodiments, the first cell may be a reference cell. In some embodiments, the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. In some embodiments, the network device sends the first information to the terminal via radio resource control RRC signaling. In some embodiments, the first cell is configured in units of secondary cells Scells (per Scell). In some embodiments, the secondary cell configuration ScellConfig information element IE of the RRC signaling indicates the first cell. In some embodiments, the first cell is a serving cell in an activated state and / or in a non-dormant state. Exemplarily, the first cell is not configured with a dormant bandwidth part (BWP), or the currently activated BWP is not a dormant BWP. In some embodiments, the network device sends the first information to the terminal via a media access control MAC control element CE. In some embodiments, the MAC CE is used to activate the SSB-less Scell. In some embodiments, the MAC CE is used to activate at least two SSB-less Scells, each of the at least two SSB-less Scells being associated with a first cell. In some embodiments, each of the at least two SSB-less Scells is associated with a first cell according to a size relationship of a corresponding SSB-less SCell index. In some embodiments, the first information includes identification (ID) information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index (eg, ServCellIndex). In some embodiments, the identification information of the first cell corresponds one-to-one in ascending order of the corresponding SSB-less SCell index. Step S2102: The terminal determines to obtain time information from the first cell or the second cell. In some embodiments, it is determined whether to obtain the time information from the first cell or from the second cell according to the reception result of the first information. In some embodiments, the first cell is a cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks. In some embodiments, the second cell is an activated serving cell or a special cell (SpCell) in the same frequency band as the SSB-less Scell. In some embodiments, the time information is used for time synchronization between the terminal and the network. In some embodiments, it is determined that the first information is received, and it is determined that the time information is obtained from the first cell. In some embodiments, if it is determined that the first cell is configured, the time information is obtained from the first cell; if it is determined that the first cell is not configured, the time information is obtained preferentially from an activated serving cell in the same frequency band as the first cell. If the serving cell is not determined, the time information can be obtained from the SpCell. In some embodiments, it is determined that the first information is not received, and it is determined to obtain the time information from the second cell. In some embodiments, it is determined that the time information is obtained from the second cell, and a priority of obtaining the time information from an activated serving cell in the same frequency band as the SSB-less Scell ​​is higher than a priority of obtaining the time information from the SpCell. In some embodiments, the second cell is determined to be selected, and a serving cell that is already activated before the SSB-less SCell is activated is selected as the second cell, or a cell that is activated simultaneously with the SSB-less SCell is selected as the second cell. In some embodiments, the SSB-less Scell ​​and the first cell are activated by the same MAC CE; the activation processing time for activating the SSB-less Scell ​​includes the sum of the activation processing time for activating the first cell and a first offset duration. The first offset duration may be indicated by the network or specified by the protocol. In some embodiments, the first cell is activated before the SSB-less Scell, and the time interval between activating the first cell and activating the SSB-less Scell ​​is a second offset duration. The second offset duration may be indicated by the network or specified by the protocol. In some embodiments, before the SSB-less Scell ​​is activated, the activation state of the serving cell configured or designated as the first cell is maintained. In some embodiments, if the first cell has been activated before the SSB-less SCell is activated, the serving cell configured as the first cell needs to be activated all the time and cannot be deactivated. In some embodiments, an asynchronous Async secondary cell Scell ​​cannot be configured as the SSB-less Scell ​​and / or the first cell. In some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; and the second cell is determined from a serving cell of an SCell or sPcell in the same intra-band. In some embodiments, activation of the Async Scell ​​is delayed until the second cell is determined. In some embodiments, Async Scell ​​is configured as the SSB-less Scell ​​and / or the first cell; the SSB-less Scell ​​and the first cell are in the same frequency band; the time information is determined based on the configuration information of the carrier aggregation time slot offset ca-SlotOffset of the SSB-less Scell ​​and / or the first cell and the downlink timing information of the first cell. In some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; the second cell is determined from the service cell of the SCell or sPcell of the same frequency band intra-band; it is determined that the second cell is not determined from the service cell of the SCell or sPcell of the same frequency band intra-band, and the time information is determined based on the downlink timing information of the sPCell and the configuration information of the ca-SlotOffset of the SSB-less SCell. In some embodiments, the term "information" can be interchangeably with terms such as "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "field", and "data". In some embodiments, the term "send" can be interchangeable with terms such as "transmit", "report", and "transmit". The information indication method involved in the embodiment of the present disclosure may include at least one of step S2101 to step S2102. For example, step S2101 may be implemented as an independent embodiment, and step S2102 may be implemented as an independent embodiment, but is not limited thereto. FIG3a is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3a, the present disclosure embodiment relates to a communication method, which is executed by a network device, and the method includes: Step S3101: Send first information to the terminal. In some embodiments, the first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. In some embodiments, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. In some embodiments, the sending the first information to the terminal includes: The first information is sent to the terminal through radio resource control RRC signaling. In some embodiments, the first cell is configured in units of secondary cells (Scells). In some embodiments, the secondary cell configuration ScellConfig information element IE of the RRC signaling indicates the first cell. In some embodiments, the first cell is a serving cell in an activated state and / or in a non-dormant state. In some embodiments, the sending the first information to the terminal includes: The first information is sent to the terminal through a media access control MAC control element CE. In some embodiments, the MAC CE is used to activate an SSB-less Scell. In some embodiments, the MAC CE is used to activate at least two SSB-less Scells, each of the at least two SSB-less Scells being associated with a first cell. In some embodiments, each of the at least two SSB-less Scells is associated with a first cell according to a size relationship of a corresponding SSB-less SCell index. In some embodiments, the first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index. FIG4a is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4a, the present disclosure embodiment relates to a communication method, which is executed by a terminal, and the method includes: Step S4101: Obtain first information. In some embodiments, first information sent by a network device is received. In some embodiments, first information sent by a network device is received, but not limited thereto, and first information sent by other entities may also be received. In some embodiments, first information specified by a protocol is obtained. In some embodiments, the first information is obtained from an upper layer(s). In some embodiments, processing is performed to obtain the first information. In some embodiments, the optional implementation of step S4101 can refer to the optional implementation of step S2201 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S4102: Determine to obtain time information from the first cell or the second cell. In some embodiments, the optional implementation of step S4102 can refer to the optional implementation of step S2202 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. The information indication method involved in the embodiment of the present disclosure may include at least one of step S4101 to step S4102. For example, step S4101 may be implemented as an independent embodiment, and step S4102 may be implemented as an independent embodiment, but is not limited thereto. FIG4b is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4b, the present disclosure embodiment relates to a communication method, which is executed by a terminal, and the method includes: Step S4201: Determine whether to obtain time information from the first cell or from the second cell according to the reception result of the first information. In some embodiments, the first information is used to indicate the first cell; the first cell is a cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or a special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization. In some embodiments, the optional implementation of step S4201 can refer to the optional implementation of step S2201 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. In some embodiments, determining, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell comprises one of the following: determining that the first information is received, and determining to obtain the time information from the first cell; Determine that the first information is not received, and determine to obtain the time information from the second cell. In some embodiments, it is determined that the time information is obtained from the second cell, and a priority of obtaining the time information from an activated serving cell in the same frequency band as the SSB-less Scell ​​is higher than a priority of obtaining the time information from the SpCell. In some embodiments, the method further comprises: Determine to select the second cell, select a service cell that is already activated before the SSB-less SCell is activated as the second cell, or select a cell that is activated at the same time as the SSB-less SCell as the second cell. In some embodiments, the method further comprises: Receive the first information sent by the network device. In some embodiments, the receiving the first information sent by the network device includes: The first information sent by the network device is received through radio resource control RRC signaling. In some embodiments, the first cell is configured in units of secondary cells (Scells). In some embodiments, the secondary cell configuration Scell ​​Config information element IE of the RRC signaling indicates the first cell. In some embodiments, the receiving the first information sent by the network device includes: The first information sent by the network device is received through the media access control MAC control element CE. In some embodiments, the MAC CE is used to activate an SSB-less Scell. In some embodiments, the MAC CE is used to activate at least two SSB-less Scells, each of the at least two SSB-less Scells being associated with a first cell. In some embodiments, each of the at least two SSB-less Scells is associated with a first cell according to a size relationship of a corresponding SSB-less SCell index. In some embodiments, the first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index. In some embodiments, the first cell and the second cell are serving cells in an activated state and / or in a non-dormant state. In some embodiments, the SSB-less Scell ​​and the first cell are activated through the same MAC CE; the activation processing time for activating the SSB-less Scell ​​includes the sum of the activation processing time for activating the first cell and a first offset duration. In some embodiments, the first cell is activated before the SSB-less Scell, and the time interval between activating the first cell and activating the SSB-less Scell ​​is a second offset duration. In some embodiments, the method further comprises: Before the SSB-less Scell ​​is activated, the activation state of the serving cell configured or designated as the first cell is maintained. In some embodiments, an asynchronous Async secondary cell Scell ​​cannot be configured as the SSB-less Scell ​​and / or the first cell. In some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; the method further includes: The second cell is determined from the serving cell of the SCell or sPcell in the same frequency band intra-band. In some embodiments, the method further comprises: The activation of the Async Scell ​​is delayed until the second cell is determined. In some embodiments, the Async Scell ​​is configured as the SSB-less Scell ​​and / or the first cell; the SSB-less Scell ​​and the first cell are in the same frequency band; and the method further includes: The time information is determined based on the configuration information of the carrier aggregation time slot offset ca-SlotOffset of the SSB-less Scell ​​and / or the first cell and the downlink timing information of the first cell. In some embodiments, an asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; the method further includes: Determine the second cell from a serving cell of an SCell or sPcell in the same frequency band intra-band; It is determined that the second cell is not determined from the serving cell of the SCell or sPcell of the intra-band, and the time information is determined based on the downlink timing information of the sPCell and the configuration information of the ca-SlotOffset of the SSB-less SCell. FIG5a is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG5a, the present disclosure embodiment relates to a communication method, which is used in a communication system 100, and the method includes one of the following steps: Step S5101: The network device sends first information to the terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell. The optional implementation of step S5101 can refer to the optional implementation of steps S2201 to S2102 in FIG. 2a and other related parts in the embodiment involved in FIG. 2a, which will not be described in detail here. In some embodiments, the above method may include the methods of the above-mentioned communication system side, network device side, terminal side, etc., which will not be repeated here. In order to better understand the embodiments of the present disclosure, some exemplary embodiments are further described below: In some embodiments, the network device configures and indicates a reference cell (corresponding to the first cell). In some embodiments, a reference cell of a SSB-less SCell is configured through RRC signaling, and the reference cell is identified by the serving cell ID, namely, ServCellIndex. The reference cell is configured per SCell and configured in the SCellConfig IE. In some embodiments, the reference cell is configured as a serving cell that is activated and in a non-dormant state as a time reference cell, that is, The cell is not configured with a dormant BWP, or the currently activated BWP is not a dormant BWP. In some embodiments, the reference cell associated with the activated SSB-less Scell ​​is dynamically indicated through the MAC CE, that is, when the SSB-less SCell is activated, the identification information of the reference cell is carried in the MAC CE. In some embodiments, if there are multiple SSb-less SCells activated, the identification information of the reference cells is indicated one by one in the order from small to large of the corresponding SSB-less SCell index. In some embodiments, the identification information of the Reference cell may be an SCell index or a serving cell index ServCellIndex. In some embodiments, for an SSB-less SCell, a reference cell is configured, and the UE uses the reference cell to obtain a time reference (corresponding time information). If not configured, the UE preferentially obtains a time reference from an activated serving cell in the same band of the SSB-less SCell, otherwise it obtains a time reference from the SpCell. In some embodiments, the reference cell is selected as a serving cell that is activated and in a non-dormant state as the time reference cell, that is, the cell is not configured with a dormant BWP, or the currently activated BWP is not a dormant BWP. In some embodiments, a cell that can become a reference cell needs to be an activated cell. In some embodiments, the SSB-less SCell and the reference cell are activated in one MAC CE, and the activation timeline of the SSB-less SCell is to add a time period (corresponding to the first offset duration) based on the timeline of the refernce cell activation, and the value of the time period depends on the RAN4 definition. In some embodiments, the reference cell has been activated before the SSB-less SCell is activated, and the delay between the reference cell activation and the SSB-less SCell activation is a time period (corresponding to the second offset duration), and the value of the time period depends on the RAN4 definition. In some embodiments, before the SSB-less SCell is activated, the reference cell is required to have been activated, and the serving cell configured as the reference cell needs to be activated all the time and cannot be deactivated. In some embodiments, a cell configured as a reference cell cannot be configured with a dormant BWP, or the activated BWP cannot be a dormant BWP. In some embodiments, in an Async CA scenario, a certain SCell may be configured as an Async SCell, that is, there is a timing offset of several slots between the SCell and the PCell. In some embodiments, in the Async CA scenario, the Async SCell cannot be configured as an SSB-less SCell or a reference cell. In some embodiments, in the Async CA scenario, the Async SCell is configured as an SSB-less SCell, but a reference cell cannot be configured. The UE finds a serving cell from an intra-band SCell or sPcell to obtain a time reference. If not found, the UE delays activating the Async SCell until an intra-band SCell or sPcell is found as a time reference cell. In some embodiments, in the Async CA scenario, the SSB-less SCell and / or the reference cell are configured as Async SCell, and the SSB-less SCell and the reference cell are inter-band. The UE obtains the time reference according to the configuration of the ca-SlotOffset of the SSB-less SCell and / or the reference cell and the downlink timing of the reference cell. In some embodiments, in the Async CA scenario, the Async SCell is configured as an SSB-less SCell and no reference cell is configured. The UE finds a serving cell from an intra-band SCell or sPcell to obtain a time reference. If not found, the UE obtains the time reference based on the DL timing of the sPCell and the configuration of the ca-SlotOffset of the SSB-less SCell. In some embodiments, the Async SCell is an SCell configured with ca-SlotOffset. The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step performed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step performed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods. It should be understood that the division of the units or modules in the above device is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the units or modules in the device can be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory inside the device or a memory outside the device. Alternatively, the units or modules in the device may be implemented in the form of hardware circuits, and the functions of some or all of the units or modules may be implemented by designing the hardware circuits. The hardware circuits may be understood as one or more processors. For example, in one implementation, the hardware circuits are application-specific integrated circuits (ASICs), and the functions of some or all of the units or modules may be implemented by designing the logical relationship of components within the circuits. For another example, in another implementation, the hardware circuits may be implemented by programmable logic devices (PLDs). For example, field programmable gate arrays (FPGAs) may include a large number of logic gate circuits, and the connections between the logic gate circuits may be configured by configuration files. The functions of some or all of the above units or modules are realized by a connection relationship. All units or modules of the above devices can be realized in the form of a processor calling software, or in the form of a hardware circuit, or in the form of a processor calling software, and the rest in the form of a hardware circuit. In the disclosed embodiment, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may realize certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the processor loads a configuration document to implement the process of hardware circuit configuration, which may be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it may also be a hardware circuit designed for artificial intelligence, which may be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc. FIG6a is a schematic diagram of the structure of the terminal proposed in the embodiment of the present disclosure. As shown in FIG6a, the terminal 6100 may include: at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the transceiver module is used to send and receive information. Optionally, the transceiver module is used to execute at least one of the communication steps such as sending and / or receiving executed by the terminal in any of the above methods, which will not be repeated here. Optionally, the processing module is used to execute at least one of the other steps executed by the terminal in any of the above methods, which will not be repeated here. FIG6b is a schematic diagram of the structure of the network device proposed in the embodiment of the present disclosure. As shown in FIG6b, the network device 6200 may include: at least one of a transceiver module 6201, a processing module 6202, etc. In some embodiments, the transceiver module is used to send and receive information. Optionally, the transceiver module is used to execute at least one of the communication steps such as sending and / or receiving executed by the network device in any of the above methods, which will not be repeated here. Optionally, the processing module is used to execute at least one of the other steps executed by the network device in any of the above methods, which will not be repeated here. FIG7a is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. The communication device 8100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. The communication device 8100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment. As shown in FIG. 7a , the communication device 8100 includes one or more processors 8101. The processor 8101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and the communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a program, and process the data of the program. The communication device 8100 is used to execute any of the above methods. In some embodiments, the communication device 8100 further includes one or more memories 8102 for storing instructions. Optionally, all or part of the memory 8102 may also be outside the communication device 8100. In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the transceiver 8103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S3101, but not limited thereto), and the processor 8101 performs at least one of the other steps (for example, step S2102, step S3102, but not limited thereto). In some embodiments, the transceiver may include a receiver and / or a transmitter, and the receiver and the transmitter may be separate or integrated. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, etc. may be replaced with each other, the terms such as transmitter, transmission unit, transmitter, transmission circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other. In some embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8102, and the interface circuit 8104 may be used to receive signals from the memory 8102 or other devices, and may be used to send signals to the memory 8102 or other devices. For example, the interface circuit 8104 may read instructions stored in the memory 8102 and send the instructions to the processor 8101. The communication device 8100 described in the above embodiments may be a network device or a terminal, but the communication device described in the present disclosure may be a network device or a terminal. The scope of the communication device 8100 is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 7a. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc. Fig. 7b is a schematic diagram of the structure of the chip 8200 proposed in the embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in Fig. 7b, but it is not limited thereto. The chip 8200 includes one or more processors 8201, and the chip 8200 is used to execute any of the above methods. In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the interface circuit 8202 is connected to the memory 8203. The interface circuit 8202 can be used to receive signals from the memory 8203 or other devices, and the interface circuit 8202 can be used to send signals to the memory 8203 or other devices. For example, the interface circuit 8202 can read instructions stored in the memory 8203 and send the instructions to the processor 8201. In some embodiments, the interface circuit 8202 executes at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S3101, but not limited to this), and the processor 8201 executes at least one of the other steps (for example, step S2102, step S3102, but not limited to this). In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably. In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Optionally, all or part of the memory 8203 may be outside the chip 8200. The present disclosure also proposes a storage medium, on which instructions are stored, and when the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium. The present disclosure also proposes a program product, which, when executed by the communication device 8100, enables the communication device 8100 to execute any of the above methods. Optionally, the program product is a computer program product. The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to execute any one of the above methods.

Claims

1. A communication method, characterized in that: The method is performed by a network device, and the method includes: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell.

2. The method according to claim 1, characterized in that The sending the first information to the terminal includes: The first information is sent to the terminal through radio resource control RRC signaling.

3. The method according to claim 2, characterized in that The first cell is configured in units of secondary cells Scells.

4. The method according to claim 2, characterized in that: The secondary cell configuration ScellConfig information element IE of the RRC signaling indicates the first cell.

5. The method according to claim 2, characterized in that: The first cell is a serving cell in an activated state and / or in a non-dormant state.

6. The method according to claim 1, characterized in that The sending the first information to the terminal includes: The first information is sent to the terminal through a media access control MAC control element CE.

7. The method according to claim 6, characterized in that The MAC CE is used to activate the SSB-less Scell.

8. The method according to claim 7, characterized in that The MAC CE is used to activate at least two SSB-less Scells, and each of the at least two SSB-less Scells is associated with a first cell.

9. The method according to claim 8, characterized in that Each of the at least two SSB-less Scells is associated with a first cell according to a size relationship of a corresponding SSB-less SCell index.

10. The method according to claim 2 or 6, characterized in that: The first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index.

11. A communication method, characterized in that: The method is executed by a terminal, and includes: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization.

12. The method according to claim 11, characterized in that The determining, according to the result of receiving the first information, to obtain the time information from the first cell or from the second cell comprises one of the following: determining that the first information is received, and determining to obtain the time information from the first cell; Determine that the first information is not received, and determine to obtain the time information from the second cell.

13. The method according to claim 12, characterized in that Determine to obtain the time information from the second cell, and the priority of obtaining the time information from an activated serving cell in the same frequency band as the SSB-less Scell ​​is higher than the priority of obtaining the time information from the SpCell.

14. The method according to claim 11 or 12, further comprising: Determine to select the second cell, select a service cell that is already activated before the SSB-less SCell is activated as the second cell, or select a cell that is activated at the same time as the SSB-less SCell as the second cell.

15. The method according to claim 11, characterized in that The method further comprises: Receive the first information sent by the network device.

16. The method according to claim 11, characterized in that The receiving the first information sent by the network device includes: The first information sent by the network device is received through radio resource control RRC signaling.

17. The method according to claim 16, characterized in that The first cell is configured in units of secondary cells Scells.

18. The method according to claim 16, characterized in that The secondary cell configuration Scell ​​Config information element IE of the RRC signaling indicates the first cell.

19. The method according to claim 11, characterized in that The receiving the first information sent by the network device includes: The first information sent by the network device is received through the media access control MAC control element CE.

20. The method according to claim 19, characterized in that The MAC CE is used to activate the SSB-less Scell.

21. The method according to claim 20, characterized in that The MAC CE is used to activate at least two SSB-less Scells, and each of the at least two SSB-less Scells is associated with a first cell.

22. The method according to claim 21, characterized in that Each of the at least two SSB-less Scells is associated with a first cell according to a size relationship of a corresponding SSB-less SCell index.

23. The method according to claim 16 or 19, characterized in that: The first information includes identification information of the first cell; the identification information includes one of the following: a secondary cell Scell ​​index; a serving cell index.

24. The method according to claim 11, characterized in that The first cell and the second cell are serving cells in an activated state and / or in a non-dormant state.

25. The method according to claim 24, characterized in that The SSB-less Scell ​​and the first cell are activated through the same MAC CE; the activation processing time for activating the SSB-less Scell ​​includes the sum of the activation processing time for activating the first cell and a first offset duration.

26. The method according to claim 24, characterized in that The first cell is activated before the SSB-less Scell, and the time interval between activating the first cell and activating the SSB-less Scell ​​is a second offset duration.

27. The method according to any one of claims 16 to 26, characterized in that The method further comprises: Before the SSB-less Scell ​​is activated, the activation state of the serving cell configured or designated as the first cell is maintained.

28. The method according to claim 11, characterized in that An asynchronous secondary cell (Scell) cannot be configured as the SSB-less Scell ​​and / or the first cell.

29. The method according to claim 11, characterized in that An asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; and the method further includes: The second cell is determined from the serving cell of the SCell or sPcell in the same frequency band intra-band.

30. The method according to claim 29, characterized in that The method further comprises: The activation of the Async Scell ​​is delayed until the second cell is determined.

31. The method according to claim 11, characterized in that The Async Scell ​​is configured as the SSB-less Scell ​​and / or the first cell; the SSB-less Scell ​​and the first cell are in the same frequency band; and the method further includes: The time information is determined based on the configuration information of the carrier aggregation time slot offset ca-SlotOffset of the SSB-less Scell ​​and / or the first cell and the downlink timing information of the first cell.

32. The method according to claim 11, characterized in that An asynchronous Async secondary cell Scell ​​is configured as the SSB-less Scell ​​and is not configured as the first cell; and the method further includes: Determine the second cell from a serving cell of an SCell or sPcell in the same frequency band intra-band; It is determined that the second cell is not determined from the serving cell of the SCell or sPcell of the intra-band, and the time information is determined based on the downlink timing information of the sPCell and the configuration information of the ca-SlotOffset of the SSB-less SCell.

33. A communication method, characterized in that: The method comprises: The network device sends first information to the terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell.

34. A network device, characterized in that: The network equipment includes: The transceiver module is configured as follows: Sending first information to a terminal; The first information is used to indicate: a first cell associated with a secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; and the terminal accessing the SSB-less Scell ​​obtains time information for time synchronization through the first cell.

35. A terminal, characterized in that: The terminal comprises: The processing module is configured as follows: Determine, according to a result of receiving the first information, to obtain the time information from the first cell or from the second cell; Among them, the first information is used to indicate the first cell; the first cell is a cell associated with the secondary cell SSB-less Scell ​​with reduced synchronization signal blocks; the second cell is an activated service cell or special cell SpCell in the same frequency band as the SSB-less Scell; and the time information is used for time synchronization.

36. A communication system, characterized in that: The communication system includes a network device and a terminal; the network device is configured to implement the method described in any one of claims 1 to 10, and the terminal is configured to implement the method described in any one of claims 11 to 32.

37. A network device, characterized in that: The network equipment includes: one or more processors; The network device is used to execute the method according to any one of claims 1 to 10.

38. A terminal, characterized in that: The terminal comprises: one or more processors; The terminal is used to execute the method described in any one of claims 11 to 32.

39. A storage medium, characterized in that: The storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method according to any one of claims 1 to 10 and claims 11 to 32.

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