Communication method and apparatus

Abstract

The present application belongs to the technical field of communications. Provided are a communication method and an apparatus, which are used for implementing system message transmission in future communication systems. The method comprises: on the basis of actual conditions, a sending end selecting an appropriate acquisition mode for a system message and carrying onto a synchronization signal the acquisition mode, such that after receiving the synchronization signal, a receiving end can determine, on the basis of the acquisition mode carried on the synchronization signal, a specific mode to acquire the system message, for example, the receiving end passively receiving the system message or actively requesting for the system message. Therefore, synchronization signals can be reused to indicate acquisition modes of system messages without the need for additionally configuring the acquisition modes, thus reducing the overhead.

Description

Communication method and device Technical Field

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

[0002] Currently, during cell search and synchronization, a terminal can obtain the master information block (MIB) through the synchronization signal and physical broadcast channel (PBCH) block (SSB). The MIB defines the most basic system information of the cell and the parameters required to decode the system information block 1 (SIB1), such as the system frame number, subcarrier spacing indicator, control resource set (CoreSet) 0 for SIB1 reception, and search space configuration. Furthermore, the terminal can obtain SIB1 based on CoreSet0 and search space configuration in the MIB.

[0003] However, in future communication systems, system messages may be transmitted in a variety of different ways. That is, the way a terminal obtains system messages may be different from the above-mentioned way. The specific method of obtaining the system messages is currently a hot topic of discussion.

[0004] Summary of the Invention

[0005] Embodiments of the present application provide a communication method and apparatus for providing a new way to obtain system messages to reduce overhead.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, a communication method is provided, the method comprising: receiving a synchronization signal from a network device, the synchronization signal carrying a method for obtaining a system message; and obtaining the system message based on the method.

[0008] Based on the method of the first aspect, it can be seen that in future communication systems, system messages may have multiple different transmission methods, so that the receiving end (such as a terminal device) can have multiple different ways of obtaining system messages. The sending end (such as a network device) can select an appropriate method for obtaining system messages according to actual conditions, and carry the acquisition method on the synchronization signal, so that after receiving the synchronization signal, the receiving end can determine which method should be used to obtain the system message based on the acquisition method carried on the synchronization signal, such as the receiving end passively receiving the system message or actively requesting the system message. In this way, the synchronization signal can be reused to indicate the acquisition method of the system message, without the need to additionally configure the acquisition method, thereby reducing overhead.

[0009] In one possible design, the acquisition method is any of the following: directly receiving system messages from the network device, or acquiring system messages by sending a first signal. That is, the network device can select an appropriate acquisition method based on actual conditions (e.g., the number of users). For example, when the network is busy (e.g., with a large number of users), the network device can periodically send system messages, in which case the receiving end can directly receive the system messages. Alternatively, when the network is idle (e.g., with a small number of users), the network device can send system messages after receiving a first signal from the receiving end. In this case, the receiving end needs to send the first signal to acquire the system message. In this way, an appropriate method for acquiring system messages can be selected based on actual conditions, thereby reducing energy consumption of the network device.

[0010] In one possible design, the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the acquisition method is carried on the PSS or the SSS. That is, the acquisition method can be flexibly selected based on actual conditions to carry which synchronization signal.

[0011] Optionally, the synchronization signal also carries at least one of the following: a cell identifier of the network device's cell, a cell prohibition identifier, and time information; the cell prohibition identifier indicates whether the network device allows the terminal to reside in the cell, and the time information indicates the time to directly receive system messages or the time to send the first signal. In other words, the receiving end can distinguish between cells based on the cell identifier carried in the synchronization signal; determine whether it can reside in the cell based on the cell prohibition identifier, that is, whether it needs to obtain system messages. For example, when the cell prohibition identifier indicates prohibition, the receiving end does not need to obtain system messages; and determine the time to obtain system messages based on the time information. For example, when the acquisition method is to directly receive system messages from the network device, the time information indicates the time to directly receive system messages; or, when the acquisition method is to obtain system messages by sending the first signal, the time information indicates the time to send the first signal. In this way, the various information carried by the synchronization signal can be flexibly set according to actual conditions to avoid communication redundancy caused by mismatch with actual conditions.

[0012] Furthermore, the cell identifier is carried on the SSS. It can be understood that the cell identifier is used to identify each cell, and the number of cell identifiers is usually large. For example, the cell identifiers in the NR include 1-1008. That is to say, more sequences are usually required to represent different cell identifiers. Due to the large number of sequences, the complexity of the detection at the receiving end will increase, and the receiving end will perform downlink synchronization (coarse synchronization) based on the PSS. Therefore, carrying the cell identifier on the SSS can avoid carrying the cell identifier on the PSS, resulting in a higher complexity of the PSS, which makes it more complex for the receiving end to detect the PSS, and is inconvenient for the receiving end to perform downlink synchronization (coarse synchronization) based on the PSS.

[0013] Furthermore, the cell barring flag and / or time information is carried on the PSS. That is, the PSS can carry the cell barring flag, time information, or the cell barring flag and time information.

[0014] Furthermore, the cell prohibition identifier and / or time information are carried on the SSS. That is, the SSS can carry the cell prohibition identifier, time information, or the cell prohibition identifier and time information. It can be understood that when at least one of the cell prohibition identifier and time information is carried on the SSS, the PSS can carry less information. In this case, the PSS will not carry the acquisition method, cell prohibition identifier, and time information. In this way, the complexity of the receiving end's PSS detection can be reduced, so that the receiving end can perform downlink synchronization based on the PSS.

[0015] Furthermore, when the cell barring flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell barring flag is carried on the SSS. In this way, the cell barring flag and time information can be carried on the PSS or SSS respectively, so as to avoid the situation where both the cell barring flag and time information are carried on the PSS or SSS, causing the PSS or SSS to carry too much information and resulting in higher complexity of the PSS or SSS.

[0016] Furthermore, the SSS includes a first sequence and a second sequence. The first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of a cell barring identifier, time information, and an acquisition method. That is, when the SSS carries multiple pieces of information, the second sequence is used to carry the remaining information in addition to the cell identifier. By using different sequences to carry different information, the multi-sequence feature can be utilized to indicate more information without increasing total resource overhead, avoiding the use of a longer single sequence to indicate each piece of information, which would increase resource overhead.

[0017] Furthermore, the second sequence is used to scramble the first sequence. That is, using the scrambling sequence (the second sequence) to carry part of the information instead of introducing additional resource indication information helps reduce indication resource overhead.

[0018] Furthermore, the second sequence is a Hadamard sequence, which is easy to implement in a terminal due to its simple calculation and low complexity.

[0019] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS. That is, the network device can set different periods for sending the PSS and SSS, such as sending the PSS every 20 milliseconds (ms) and the SSS every 80 ms, that is, sending the SSS only once after sending the PSS three times. In this way, the PSS can indicate whether the network device should send the SSS, so that the receiving end can successfully receive the SSS based on the information indicated by the PSS.

[0020] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0021] In a second aspect, a communication method is provided, the method comprising: sending a synchronization signal carrying a method for obtaining a system message; and sending the system message.

[0022] In a possible design solution, the acquiring method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

[0023] In one possible design scheme, the synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

[0024] Optionally, the synchronization signal also carries at least one of the following: a cell identifier of the cell of the network device, a cell prohibition identifier, and time information; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time for directly receiving the system message, or the time for sending the first signal.

[0025] Furthermore, the cell identity is carried on the SSS.

[0026] Furthermore, the cell barring flag and / or time information is carried on the PSS.

[0027] Furthermore, the cell barring flag and / or time information is carried on the SSS.

[0028] Furthermore, when the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

[0029] Furthermore, the SSS includes a first sequence and a second sequence, the first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of a cell prohibition identifier, time information, and an acquisition method.

[0030] Furthermore, the second sequence is used to scramble the first sequence.

[0031] Furthermore, the second sequence is a Hadamard sequence.

[0032] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS.

[0033] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0034] In one possible design, when the number of service users is greater than or equal to a threshold, the system message is obtained by directly receiving the system message from the network device; or, when the number of service users is less than the threshold, the system message is obtained by sending a first signal. In this way, the method for obtaining system messages can be flexibly determined based on actual circumstances.

[0035] In addition, the technical effects of the method described in the second aspect can also refer to the technical effects of the method described in the first aspect, and will not be repeated here.

[0036] In a third aspect, a communication method is provided, comprising: receiving a synchronization signal from a network device, the synchronization signal carrying a cell barring flag; and determining whether to obtain a system message based on the cell barring flag, wherein the cell barring flag indicates whether a terminal is allowed to reside in a cell of the network device.

[0037] Based on the method in the third aspect, we can see that the cell barring flag is currently obtained through the MIB. This means that the receiving end can only obtain the cell barring flag and determine whether it can access the cell after successfully demodulating the physical broadcast channel (PBCH). This approach can significantly increase the energy consumption of the receiving end. Therefore, by carrying the cell barring flag in the synchronization signal, the receiving end can obtain the cell barring flag after detecting the synchronization signal. In other words, in this case, the receiving end no longer needs to receive and demodulate the PBCH to obtain the cell barring flag. This reduces the energy consumption of the receiving end.

[0038] In one possible design, the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the cell prohibition flag is carried on the PSS or the SSS. That is, the synchronization signal on which the cell prohibition flag is carried can be flexibly selected according to actual conditions.

[0039] In one possible design, the synchronization signal also carries at least one of the following: a cell identifier of a cell of the network device, a method for obtaining system messages, and time information. The method for obtaining system messages is any of the following: directly receiving system messages from the network device or obtaining system messages by sending a first signal. The time information indicates the time of direct system message reception or the time of sending the first signal. In other words, after receiving the synchronization signal, the receiving end can distinguish between cells based on the cell identifier carried in the synchronization signal; determine which method to use for obtaining system messages based on the method for obtaining system messages; and determine the time to obtain system messages based on the time information. In this way, the information carried by the synchronization signal can be flexibly configured based on actual conditions, avoiding communication redundancy caused by mismatches with actual conditions.

[0040] Optionally, the cell identifier is carried on the SSS. It can be understood that the cell identifier is used to identify each cell, and the number of cell identifiers is usually large. For example, the cell identifiers in the NR include 1-1008, that is, more sequences are usually required to represent different cell identifiers. Due to the large number of sequences, the complexity of the detection at the receiving end will increase, and the receiving end will perform downlink synchronization (coarse synchronization) based on the PSS. Therefore, carrying the cell identifier on the SSS can avoid carrying the cell identifier on the PSS, resulting in a higher complexity of the PSS, which makes it more complex for the receiving end to detect the PSS, and is inconvenient for the receiving end to perform downlink synchronization (coarse synchronization) based on the PSS.

[0041] Furthermore, the acquisition method and / or time information is carried on the PSS. In other words, the PSS can carry the acquisition method, time information, or both the acquisition method and time information.

[0042] Furthermore, the acquisition method and / or time information is carried on the SSS. That is, the SSS can carry the acquisition method, time information, or both. It is understandable that when at least one of the acquisition method and time information is carried on the SSS, the PSS can carry less information. In this case, the PSS will not carry the acquisition method, cell barring flag, or time information. This reduces the complexity of the PSS detection at the receiving end, facilitating downlink synchronization based on the PSS.

[0043] Furthermore, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS. In this way, the acquisition method and time information can be carried on the PSS or SSS respectively, avoiding the situation where both the acquisition method and time information are carried on the PSS or SSS, causing the PSS or SSS to carry too much information and resulting in higher complexity of the PSS or SSS.

[0044] Furthermore, the SSS includes a first sequence and a second sequence. The first sequence is used to carry the cell identifier, and the second sequence is used to carry at least one of the following: acquisition method, time information, and cell barring indicator. That is, when the SSS carries multiple pieces of information, the second sequence is used to carry the remaining information in addition to the cell identifier. By using different sequences to carry different information, the multi-sequence feature can be utilized to indicate more information without increasing total resource overhead, avoiding the use of a longer single sequence to indicate each piece of information, which would increase resource overhead.

[0045] Furthermore, the second sequence is used to scramble the first sequence. That is, using the scrambling sequence (the second sequence) to carry part of the information instead of introducing additional resource indication information helps reduce indication resource overhead.

[0046] Furthermore, the second sequence is a Hadamard sequence, which is easy to implement in a terminal due to its simple calculation and low complexity.

[0047] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS. That is, the network device can set different periods for sending the PSS and SSS, such as sending the PSS every 20 milliseconds (ms) and the SSS every 80 ms, that is, sending the SSS only once after sending the PSS three times. In this way, the PSS can indicate whether the network device should send the SSS, so that the receiving end can successfully receive the SSS based on the information indicated by the PSS.

[0048] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0049] In a fourth aspect, a communication method is provided, the method comprising: determining whether a cell of a network device allows a terminal to reside; and sending a synchronization signal, the synchronization signal carrying a cell prohibition flag, the cell prohibition flag being used to indicate whether a cell of the network device allows a terminal to reside.

[0050] In one possible design scheme, the synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the cell prohibition flag is carried on the PSS, or the cell prohibition flag is carried on the SSS.

[0051] In one possible design scheme, the synchronization signal also carries at least one of the following: a cell identifier of a cell of the network device, a method for obtaining a system message, and time information; wherein the acquisition method is any one of the following: directly receiving a system message from the network device, or obtaining a system message by sending a first signal, and the time information is used to indicate the time of directly receiving the system message, or the time of sending the first signal.

[0052] Optionally, the cell identity is carried on the SSS.

[0053] Furthermore, the acquisition method and / or time information is carried on the PSS.

[0054] Furthermore, the acquisition method and / or time information is carried on the SSS.

[0055] Furthermore, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS.

[0056] Furthermore, the SSS includes a first sequence and a second sequence, the first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of an acquisition method, time information, and a cell prohibition identifier.

[0057] Furthermore, the second sequence is used to scramble the first sequence.

[0058] Furthermore, the second sequence is a Hadamard sequence.

[0059] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS.

[0060] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0061] In addition, the technical effects of the method described in the fourth aspect can also refer to the technical effects of the method described in the third aspect, and will not be repeated here.

[0062] In a fifth aspect, a communication device is provided. The communication device includes: a module for executing the method described in the first aspect, such as a transceiver module and a processing module. For example, the transceiver module is configured to receive a synchronization signal from a network device, the synchronization signal carrying a method for obtaining a system message; and the processing module is configured to obtain the system message based on the method.

[0063] Optionally, the transceiver module may include a sending module and a receiving module, wherein the sending module is used to implement the sending function of the communication device described in the fifth aspect, and the receiving module is used to implement the receiving function of the communication device described in the fifth aspect.

[0064] Optionally, the communication device described in the fifth aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device may execute the method described in the first aspect.

[0065] It can be understood that the communication device described in the fifth aspect can be a terminal or a network device, such as a remote device, or a chip (system) or other parts or components that can be set in a terminal or network device, or a device that includes a terminal or network device. This application does not limit this.

[0066] In addition, the technical effects of the communication device described in the fifth aspect can refer to the technical effects of the method described in the first aspect, and will not be repeated here.

[0067] In a sixth aspect, a communication device is provided. The communication device includes: a module for executing the method described in the second aspect, such as a transceiver module and a processing module. For example, the processing module is configured to control the transceiver module to transmit a synchronization signal carrying a method for obtaining a system message; and to transmit the system message.

[0068] Optionally, the transceiver module may include a sending module and a receiving module, wherein the sending module is used to implement the sending function of the communication device described in the sixth aspect, and the receiving module is used to implement the receiving function of the communication device described in the sixth aspect.

[0069] Optionally, the communication device described in the sixth aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device may execute the method described in the second aspect.

[0070] It can be understood that the communication device described in the sixth aspect can be a terminal or a network device, such as a remote device, or a chip (system) or other parts or components that can be set in a terminal or network device, or a device that includes a terminal or network device. This application does not limit this.

[0071] In addition, the technical effects of the communication device described in the sixth aspect can refer to the technical effects of the method described in the second aspect, and will not be repeated here.

[0072] In a seventh aspect, a communication device is provided. The communication device includes: a module for executing the method described in the third aspect, such as a transceiver module and a processing module. For example, the transceiver module is configured to receive a synchronization signal from a network device, the synchronization signal carrying a cell barring flag, the cell barring flag being used to indicate whether a terminal is allowed to reside in a cell of the network device; and the processing module is configured to determine whether to obtain a system message based on the cell barring flag.

[0073] Optionally, the transceiver module may include a sending module and a receiving module, wherein the sending module is used to implement the sending function of the communication device described in the seventh aspect, and the receiving module is used to implement the receiving function of the communication device described in the seventh aspect.

[0074] Optionally, the communication device described in the seventh aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device may execute the method described in the third aspect.

[0075] It can be understood that the communication device described in the seventh aspect can be a terminal or a network device, such as a remote device, or a chip (system) or other parts or components that can be set in a terminal or network device, or a device that includes a terminal or network device. This application does not limit this.

[0076] In addition, the technical effects of the communication device described in the seventh aspect can refer to the technical effects of the method described in the third aspect, and will not be repeated here.

[0077] In an eighth aspect, a communication device is provided. The communication device includes: a module for executing the method described in the fourth aspect, such as a transceiver module and a processing module. For example, the processing module is configured to determine whether a cell of a network device allows a terminal to reside; and the transceiver module is configured to transmit a synchronization signal, the synchronization signal carrying a cell prohibition flag, the cell prohibition flag being configured to indicate whether the cell of the network device allows the terminal to reside.

[0078] Optionally, the transceiver module may include a sending module and a receiving module, wherein the sending module is used to implement the sending function of the communication device described in the eighth aspect, and the receiving module is used to implement the receiving function of the communication device described in the eighth aspect.

[0079] Optionally, the communication device described in the eighth aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device may execute the method described in the fourth aspect.

[0080] It can be understood that the communication device described in the eighth aspect can be a terminal or a network device, such as a remote device, or a chip (system) or other parts or components that can be set in a terminal or network device, or a device that includes a terminal or network device. This application does not limit this.

[0081] In addition, the technical effects of the communication device described in the eighth aspect can refer to the technical effects of the method described in the fourth aspect, and will not be repeated here.

[0082] In a ninth aspect, a communication device is provided, comprising: a processor configured to execute the method described in any possible implementation of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0083] In one possible design solution, the communication device described in aspect 9 may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in aspect 9 to communicate with other communication devices.

[0084] In one possible design, the communication device described in aspect 9 may further include a memory. The memory may be integrated with the processor or provided separately. The memory may be used to store the computer program and / or data involved in the method described in any one of aspect 1, aspect 2, aspect 3, or aspect 4.

[0085] In an embodiment of the present application, the communication device described in aspect nine may be the terminal or network device described in any one of aspect one, aspect two, aspect three, or aspect four, or a chip (system) or other parts or components that may be provided in the terminal or the network device, or a device that includes the terminal or the network device.

[0086] In addition, the technical effects of the communication device described in the ninth aspect can refer to the technical effects of the method described in any one of the implementation methods in the first aspect, the second aspect, the third aspect, or the fourth aspect, and will not be repeated here.

[0087] In a tenth aspect, a communication device is provided. The communication device includes: a processor coupled to a memory, the processor being configured to execute a computer program stored in the memory, so that the communication device performs the method described in any possible implementation of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0088] In one possible design solution, the communication device described in the tenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the tenth aspect to communicate with other communication devices.

[0089] In an embodiment of the present application, the communication device described in the tenth aspect may be the terminal or network device described in any one of the first aspect, the second aspect, the third aspect, or the fourth aspect, or a chip (system) or other parts or components that can be set in the terminal or the network device, or a device that includes the terminal or the network device.

[0090] In addition, the technical effects of the communication device described in the tenth aspect can refer to the technical effects of the method described in any one of the implementation methods of the first aspect, the second aspect, the third aspect, or the fourth aspect, and will not be repeated here.

[0091] In the eleventh aspect, a communication device is provided, comprising: a processor and a memory; the memory is used to store a computer program, and when the processor executes the computer program, the communication device executes the method described in any one of the implementation methods of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0092] In one possible design solution, the communication device described in the eleventh aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the eleventh aspect to communicate with other communication devices.

[0093] In an embodiment of the present application, the communication device described in the eleventh aspect may be the terminal or network device described in any one of the first aspect, the second aspect, the third aspect, or the fourth aspect, or a chip (system) or other parts or components that can be set in the terminal or the network device, or a device that includes the terminal or the network device.

[0094] In addition, the technical effects of the communication device described in the eleventh aspect can refer to the technical effects of the method described in any one of the implementation methods of the first aspect, the second aspect, the third aspect, or the fourth aspect, and will not be repeated here.

[0095] In a twelfth aspect, a communication chip stores instructions, which, when the chip runs on a communication device, enables the method described in any one of the implementation methods of the first aspect, the second aspect, the third aspect or the fourth aspect to be implemented.

[0096] In the thirteenth aspect, a communication chip includes: a logic circuit and a communication interface, the logic circuit is used to execute computer instructions, and the communication interface is used for the communication chip to communicate with other devices or chips, when the logic circuit executes the computer instructions, the method described in any one of the implementation methods of the first aspect, the second aspect, the third aspect or the fourth aspect is implemented.

[0097] In a fourteenth aspect, a communication system is provided, comprising: an apparatus for executing the method described in the first aspect, and / or an apparatus for executing the method described in the second aspect.

[0098] In a fifteenth aspect, a communication system is provided, comprising: an apparatus for executing the method described in the third aspect, and / or an apparatus for executing the method described in the fourth aspect.

[0099] In the sixteenth aspect, a computer-readable storage medium is provided, comprising: a computer program or instructions; when the computer program or instructions are run on a computer, the computer executes the method described in any possible implementation method of the first aspect, the second aspect, the third aspect or the fourth aspect.

[0100] In the seventeenth aspect, a computer program product is provided, comprising a computer program or instructions, which, when executed on a computer, enables the computer to execute the method described in any possible implementation of the first aspect, the second aspect, the third aspect or the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0101] FIG1 is a schematic diagram of the structure of a synchronization signal and a physical broadcast channel block SSB provided in an embodiment of the present application;

[0102] FIG2 is a schematic diagram of a multiplexing method of SSB and system information block 1 SIB1 provided in an embodiment of the present application;

[0103] FIG3 is a schematic diagram of SSB and SIB1 transmission provided in an embodiment of the present application;

[0104] FIG4 is a schematic diagram of the architecture of a communication system according to an embodiment of the present application;

[0105] FIG5 is a second schematic diagram of the architecture of the communication system provided in an embodiment of the present application;

[0106] FIG6 is a flow chart of a communication method according to an embodiment of the present application;

[0107] FIG7 is a schematic diagram of the time interval between the synchronization signal and the first signal under different time division duplex (TDD) ratios provided in an embodiment of the present application;

[0108] FIG8 is a schematic diagram of obtaining system messages according to an embodiment of the present application;

[0109] FIG9 is a second flow chart of the communication method provided in an embodiment of the present application;

[0110] FIG10 is a first structural diagram of a communication device provided in an embodiment of the present application;

[0111] FIG11 is a second structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0112] For ease of understanding, the technical terms involved in the embodiments of this application are first introduced below.

[0113] 1.SSB:

[0114] As shown in Figure 1, NR introduces the concept of SSB during cell search and synchronization. The SSB consists of the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH, and demodulation reference signal (DMRS). The SSB occupies four orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a total of 240 subcarriers in the frequency domain. The PSS, SSS, and PBCH are multiplexed together using time division multiplexing (TDM). The following describes the PSS, SSS, and PBCH.

[0115] 1)PSS:

[0116] The PSS is located on the 127 subcarriers in the middle of the first symbol of the SSB and uses an m-sequence, as expressed by the following formulas (1) to (3): PSS (n) = 1-2x(m); (1) 0≤n<127; (3)

[0117] Among them, x(i+7)=(x(i+4)+x(i))mod 2, [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0]. It can be seen that the PSS sequence is composed of OK, and There are three possible values, namely Therefore, there are three different PSS sequences. The terminal correlates the received signal with the three PSS sequences for peak detection, and can obtain The value of .

[0118] 2) SSS:

[0119] The SSS is located on the 127 subcarriers in the middle of the third symbol of the SSB and uses the Gold sequence, as expressed by the following formulas (4) to (7): SSS (n)=[1-2x0((n+m0)mod 127)][1-2x1((n+m1)mod 127)]; (4) 0≤n<127 (7)

[0120] Among them, x0(i+7)=(x0(i+4)+x0(i))mod 2, x1(i+7)=(x1(i+1)+x1(i))mod 2, [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1], [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1]. It can be seen that based on the SSS sequence, it can be determined And the protocol defines

[0121] After receiving PSS and SSS, it can be determined and based on and The cell identity (ID) can be determined, i.e.

[0122] 3) PBCH:

[0123] PBCH mainly carries the MIB, which defines the most basic system information of the cell and the parameters required for decoding SIB1. The information contained in the MIB includes: system frame number, subcarrier spacing indicator, SS block (block) offset from the common resource boundary k_ssb, cell barred flag (cellBarred), intra-frequency cell reselection flag (intraFreqReselection), CoreSet0 and search space configuration for SIB1 reception, and protocol field pdcch-ConfigSIB1. Among them, the system frame number includes the radio frame number, which is used to indicate network-side timing; the subcarrier spacing is used to indicate the subcarrier spacing used for receiving subsequent SIB1, other system messages, paging, and message 2 or message 4 during the initial access process; the cell barred flag is used to indicate whether the terminal is allowed to access this cell; the intra-frequency cell reselection flag is used to indicate whether the terminal in the intra-frequency cell is allowed to reselect to this cell, that is, when the high-priority cell is barred, it controls the intra-frequency cell reselection.

[0124] It is understandable that NR uses more antennas for enhanced coverage. However, more antennas will result in the antenna radiating very narrow beams, and a single narrow beam cannot cover the entire cell. Therefore, NR introduces a beam scanning method to cover the entire cell. In other words, each cell periodically transmits multiple SSBs in the time domain. Each SSB within the period has a unique number, namely the SSB index. Each SSB beam corresponds to an SSB index. This group of SSB beams is called an SSB burst set.

[0125] It can also be understood that after the terminal successfully receives and demodulates the SSB, it can receive the SIB1 according to the instructions in the PBCH to obtain the relevant configuration information for cell access. As shown in Figure 2, the protocol defines three multiplexing methods for SSB and SIB1. The multiplexing method can be obtained through the pdcch-ConfigSIB1 field in the MIB and the predefined table in the protocol.

[0126] As shown in Figure 3, to reduce terminal access latency, public information (SSB and SIB1) is sent periodically. The protocol defines that the SSB period can be configured by the network side, such as 5ms, 10ms, 20ms, 40ms, 80ms, or 160ms. For terminals accessing initially, the terminal can use the default value of 20ms for reception. SIB1 is also sent periodically, that is, the SIB1 period is 160ms. However, within this 160ms, SIB1 can be periodically repeated multiple times. The default repetition period can be 20ms, and the actual repetition period may depend on the network implementation. In addition, the SIB1 repetition transmission period varies for different SSB and CoreSet multiplexing methods. For example, for SSB and CoreSet multiplexing method 1 in Figure 2, the SIB1 repetition transmission period can be 20ms. For another example, for SSB and CoreSet multiplexing methods 2 or 3 in the figure, the SIB1 repetition transmission period is the same as the SSB period.

[0127] As can be seen, during the cell search and synchronization process, the terminal can obtain the MIB through the PBCH in the SSB. Furthermore, the terminal can obtain SIB1 based on the CoreSet0 and search space configuration in the MIB. However, in future communication systems, system messages may be transmitted in a variety of different ways. In other words, the way the terminal obtains system messages may differ from the above method. The specific method of obtaining system messages is currently a hot topic of discussion.

[0128] In response to the above technical problems, the embodiments of the present application propose the following technical solutions to provide a new method for obtaining system messages to reduce overhead.

[0129] The technical solution in this application will be described below with reference to the accompanying drawings.

[0130] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as 4th generation (4G) mobile communication systems, such as long term evolution (LTE) systems, fifth generation (5G) mobile communication systems, such as new radio (NR) systems, and communication systems evolved after 5G, such as sixth generation (6G) mobile communication systems. They can also be applied to wireless fidelity (WiFi) systems, vehicle to everything (V2X) communication systems, device-to-device (D2D) communication systems, and Internet of Vehicles communication systems.

[0131] This application will present various aspects, embodiments, or features in the context of systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Furthermore, combinations of these aspects may also be used.

[0132] Additionally, in the embodiments of this application, words such as "exemplary" and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner.

[0133] In the embodiments of the present application, "information", "signal", "message", "channel" and "signaling" can sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are matched. "of", "corresponding, relevant" and "corresponding" can sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are matched. In addition, the " / " mentioned in this application can be used to express an "or" relationship.

[0134] In the embodiments of the present application, sometimes a subscript such as W1 may be mistakenly written as a non-subscript form such as W1. When the difference is not emphasized, the meanings to be expressed are the same.

[0135] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0136] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail using the communication system shown in Figure 4 as an example. For example, Figure 4 is a schematic diagram of the architecture of a communication system applicable to the communication method provided in the embodiments of the present application.

[0137] As shown in Figure 4, the communication system includes a terminal device and a network device. The terminal device and the network device can refer to the relevant introduction of "terminal 102" and "network device 101" below, and will not be repeated here.

[0138] To facilitate understanding of the embodiments of the present application, the application scenarios used in the present application are described using the communication system architecture shown in FIG5 as an example. FIG5 is a schematic diagram illustrating a possible, non-limiting system. As shown in FIG5 , the communication system 5000 includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one network device (such as 101a and 101b in FIG5 , collectively referred to as 110) and at least one terminal (such as 102a-102j in FIG5 , collectively referred to as 102). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG5 ). The terminal 102 is connected to the network device 101 wirelessly. The network device 101 is connected to the core network 200 wirelessly or by wire. The core network device in the core network 200 and the network device 101 in the RAN 100 can be different physical devices, or they can be the same physical device that integrates the core network logical functions and the radio access network logical functions.

[0139] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or an evolved system beyond 5G (such as a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a WiFi system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0140] The terminal device and network device provided in the embodiment of the present application can be applied to the network device 101 or to the terminal 102. It is understood that Figure 5 only shows one possible communication system architecture that can be applied in the embodiment of the present application. In other possible scenarios, the communication system architecture may also include other devices.

[0141] The network device 101 is a node in the radio access network (RAN), which can also be called an access network device or a RAN node (or device). The network device 101 is used to help terminals achieve wireless access. Multiple network devices 101 in the communication system 6000 can be nodes of the same type or different types. In some scenarios, the roles of the network device 101 and the terminal 102 are relative. For example, the network element 102i in Figure 5 can be a helicopter or a drone, which can be configured as a mobile base station. For terminals 102j that access the RAN 100 through network element 102i, network element 102i is a base station; however, for base station 101a, network element 102i is a terminal. The network device 101 and the terminal 102 are sometimes referred to as communication devices. For example, network elements 101a and 101b in Figure 5 can be understood as communication devices with base station functions, and network elements 102a-102j can be understood as communication devices with terminal functions.

[0142] In one possible scenario, the network device may be a base station, an evolved NodeB (eNodeB), a transmitting and receiving point (TRP), a transmitting point (TP), a next-generation NodeB (gNB), a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, a satellite, or an access point (AP) in a WiFi system, such as a home gateway, router, server, switch, bridge, etc., an integrated access and backhaul (IAB) node, a mobile switching center, or a network device in a non-terrestrial network (NTN) communication system, i.e., a network device that can be deployed on an aerial platform or a satellite. The network device may be a macro base station (such as 110a in FIG. 5 ), a micro base station or an indoor station (such as 110b in FIG. 5 ), a relay node or a donor node, or a wireless controller in a CRAN scenario. The network device can also be a device that acts as a base station in device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, drone communication, or machine-to-machine communication. Alternatively, the network device can be a server, wearable device, vehicle, or vehicle-mounted device. For example, the access network device in vehicle-to-everything (V2X) technology can be a roadside unit (RSU).

[0143] In another possible scenario, multiple network devices collaborate to assist the terminal in achieving wireless access, and different network devices respectively implement part of the functions of the base station. For example, the network device can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). It can be understood that the network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into a network device in the access network RAN, or the CU can be divided into a network device in the core network CN, without limitation here.

[0144] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0145] In the embodiments of the present application, the form of the network device is not limited. The device used to implement the function of the network device can be a network device; it can also be a device that can support the network device to implement the function, such as a chip system. The device can be installed in the network device or used in conjunction with the network device.

[0146] Terminal 102, which may also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), user device, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal device, wireless communication device, user agent, or user device, may be a device for providing voice or data connectivity to a user, or may be an IoT device. For example, terminal devices include handheld devices with wireless connectivity, vehicle-mounted devices, and the like. Currently, terminals can be: mobile phones, tablet computers, computers with wireless transceiver functions, laptops, PDAs, mobile internet devices (MIDs), wearable devices (such as smart watches, smart bracelets, pedometers, etc.), vehicle-mounted equipment (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed trains, etc.), satellite terminals, virtual reality (VR) devices, augmented reality (AR) devices, smart point of sale (POS) machines, customer-premises equipment (CPE), wireless terminals in industrial control, smart home devices (such as refrigerators, televisions, air conditioners, electricity meters, etc.), intelligent robots, robotic arms, workshop equipment, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, flying equipment (such as intelligent robots, hot air balloons, drones, airplanes), etc. The terminal device may also be other devices with terminal functions. For example, the terminal device may also be a device that serves as a terminal in D2D communication.

[0147] The embodiments of this application do not limit the device form factor of the terminal. The device used to implement the functions of the terminal device can be the terminal device; it can also be a device that supports the terminal device to implement the functions, such as a chip system. The device can be installed in the terminal device or used in conjunction with the terminal device. In the embodiments of this application, the chip system can be composed of chips or include chips and other discrete devices.

[0148] It should be noted that the solutions in the embodiments of the present application can also be applied to other communication systems, and the corresponding names can also be replaced by the names of corresponding functions in other communication systems.

[0149] In a communication system, a network device can select an appropriate method for obtaining system messages based on actual circumstances and transmit this method along with a synchronization signal to a terminal device. This means that a terminal device can obtain system messages based on the method selected by the network device, such as whether the terminal device actively requests system messages or passively receives them. This allows the synchronization signal to be reused to indicate the method for obtaining system messages, eliminating the need for additional configuration of the method and thus reducing overhead.

[0150] For ease of understanding, the communication method provided in the embodiment of the present application will be specifically described below with reference to FIG6 .

[0151] 6 is a flow chart of a communication method according to an embodiment of the present application. The method can be applied to the communication between the terminal device and the network device in the above communication system.

[0152] As shown in FIG6 , the process of the above communication method is as follows:

[0153] S601: A network device sends a synchronization signal, which carries a method for obtaining system information. A terminal device receives the synchronization signal from the network device.

[0154] The synchronization signal includes PSS and / or SSS. For example, when the periods of PSS and SSS are the same, the synchronization signal includes PSS and SSS. For another example, when the periods of PSS and SSS are different, the synchronization signal includes PSS and / or SSS. For example, when PSS is sent every 20 ms and SSS is sent every 80 ms, the synchronization signal includes PSS, or PSS and SSS.

[0155] When the periods of the PSS and SSS are different, the presence of the SSS may be indicated by information carried by the PSS, such as by SSS presence (e.g., ON) / absence (e.g., OFF) information. For example, if the information carried by the PSS indicates that the synchronization signal includes the SSS, the synchronization signal at this time includes both the PSS and the SSS; correspondingly, if the information carried by the PSS indicates that the synchronization signal does not include the SSS, the synchronization signal at this time includes the PSS but does not include the SSS.

[0156] For example, PSS is sent once every 20ms and SSS is sent once every 60ms, that is, SSS is sent once after PSS is sent twice. When PSS is sent at the 20th and 40th ms, the information carried by PSS indicates that the synchronization signal does not contain SSS, that is, the terminal device can detect the information after receiving the PSS, so that the terminal device can no longer receive SSS after receiving PSS. When PSS is sent at the 60th ms, the information carried by PSS indicates that the synchronization signal contains SSS, so that the terminal device can receive SSS after receiving PSS. In this way, PSS and SSS can be sent according to different periods, that is, the number of times SSS is sent can be reduced, which helps to control the overhead of network devices and better control interference.

[0157] It is understood that the PSS and SSS can be transmitted using frequency division multiplexing (FDM) or TDM. The PSS and SSS can be multiplexed using the existing method using FDM or TDM, which will not be described in detail here.

[0158] The synchronization signal carries the method for obtaining the system message, that is, the method for obtaining the system message can be carried on the PSS or SSS.

[0159] System messages contain the most basic information about the network device's cell, and terminal devices can access the cell based on the system messages. System messages may include at least one of the following: the network device's cell's system frame number, subcarrier spacing indication, intra-frequency cell reselection flag, frequency domain offset between synchronization signals and public resources, cell selection information, cell access-related information, serving cell configuration information, other system message scheduling information, connection establishment failure control configuration, and terminal timer configuration.

[0160] Cell selection information includes parameters related to cell selection, such as the S criterion; cell access information includes cell-related information, such as the public land mobile network (PLMN); serving cell configuration information includes air interface configuration information of the serving cell; other system message scheduling information includes scheduling information for system messages other than SIB1, such as periodicity and combination; connection establishment failure control configuration includes some configuration information required by the terminal when connection establishment fails; terminal timer configuration includes configuration values ​​for various timers defined by the protocol. It is understood that the system frame number, subcarrier spacing indicator, and intra-frequency cell reselection flag can be found in the relevant description of "3) PBCH" above and will not be repeated here.

[0161] The acquisition method indicates the method by which the terminal device acquires the system message. There are multiple possible acquisition methods. One possible acquisition method is for the terminal device to directly receive the system message from the network device. Another possible acquisition method is for the terminal device to acquire the system message by sending a first signal. Each of these methods is described below.

[0162] Method 1: The terminal device directly receives the system message from the network device.

[0163] Mode 1 can also be referred to as direct acquisition or passive reception. In Mode 1, the network device can periodically send system messages, such as every 20ms. The network device can also use beam scanning to send system messages, without limitation. It will be understood that in this case, the terminal device only needs to periodically receive system messages sent by the network device.

[0164] Method 2: The terminal device obtains the system message by sending a first signal.

[0165] Method 2 can also be called indirect acquisition or active request. In method 2, the terminal device needs to send a specific signal, such as a first signal, to the network device. After receiving the signal, the network device sends a system message to the terminal device. At this time, the terminal device receives the system message in response.

[0166] It is understood that when there are two acquisition methods (such as Method 1 and Method 2), the acquisition method can be indicated by one bit. For example, 0 indicates that the terminal device directly receives the system message from the network device, and 1 indicates that the terminal device obtains the system message by sending a first signal. For another example, 1 indicates that the terminal device directly receives the system message from the network device, and 0 indicates that the terminal device obtains the system message by sending a first signal. There is no limitation. It is also understood that when there are more methods for the terminal device to obtain the system message from the network device, the number of bits used to indicate the acquisition method can be increased accordingly. For example, when there are four acquisition methods, two bits can be used to indicate them. Specifically, the four acquisition methods are Method #1 to Method #4, and 00, 01, 10, and 11 can be used to indicate Method #1 to Method #4, respectively.

[0167] In addition, the "direct acquisition", "passive reception", "indirect acquisition" and "active request" mentioned in the embodiments of the present application are merely exemplary expressions, and "direct acquisition" and "passive reception" can also be replaced by any possible expressions; "indirect acquisition" and "active request" can also be replaced by any possible expressions, and the embodiments of the present application do not impose any restrictions.

[0168] Optionally, the synchronization signal may also carry at least one of the following: a cell identifier of a cell of the network device, a cell barred identifier (cellBarred), and time information. Each piece of information is introduced below.

[0169] A cell identifier, also known as a cell ID, is used to identify different cells. For example, the cell ID of a cell of a network device may be 100. Currently, there are 1008 cell IDs in NR. It is understood that in future communication systems, the number of cell IDs may increase or decrease, i.e., be greater than or less than 1008, and this is not limited in the embodiments of the present application.

[0170] The cell barring flag is used to indicate whether the cell of the network device allows the terminal to reside, that is, whether the terminal is allowed to access the cell. For example, when the cell barring flag is barred (Bar), it means that the cell of the network device does not allow the terminal to reside. In this case, the terminal device may no longer obtain system information of the cell. Correspondingly, when the cell barring flag is not barred (Not Bar), it means that the cell of the network device allows the terminal to reside. In this case, the terminal device can obtain system information of the cell to access the cell.

[0171] It can be understood that the cell prohibition flag can be indicated by 1 bit, for example: 0 is used to indicate prohibition, that is, the cell of the network device does not allow the terminal to reside at this time, and 1 is used to indicate non-prohibition, that is, the cell of the network device allows the terminal to reside at this time; for example: 0 is used to indicate non-prohibition, and 1 is used to indicate prohibition, with no restriction.

[0172] The time information is used to indicate the time when the terminal device directly receives the system message, ie, the time when the network device sends the system message, or the time when the terminal device sends the first signal, ie, the time when the network device receives the first signal.

[0173] Exemplarily, when the acquisition method is for the terminal device to directly receive the system message from the network device, the time information is used to indicate the time when the terminal device directly receives the system message, thereby ensuring that the terminal device can successfully receive the system message sent by the network device. When the acquisition method is for the terminal device to obtain the system message by sending a first signal, the time information is used to indicate the time when the terminal device sends the first signal, thereby ensuring that the first signal sent by the terminal device can be successfully received by the network device, that is, the terminal device can successfully request the system message.

[0174] It is understood that the time indicated by the time information can be the time interval between the network device sending the synchronization signal and the terminal device receiving the system message, or the time interval between the network device sending the synchronization signal and the terminal device sending the first signal. For example, the time when the terminal device receives the system message or sends the first signal is n+K, where n is the time when the network device sends the synchronization signal and K is the time interval. The time interval can be multiple time slots, for example, the time interval is 5 time slots, 6 time slots, 7 time slots, 8 time slots, or other multiple time slots, without limitation.

[0175] For example, as shown in FIG7 , 0-9 in FIG7 represent different time slots, such as 0 represents the 0th time slot and 1 represents the 1st time slot. D in FIG7 indicates that downlink transmission can be performed, such as downlink transmission can be performed in the 0th time slot. S indicates that both uplink and downlink transmission can be performed, such as uplink and downlink transmission can be performed in the 7th time slot. U indicates that uplink transmission can be performed, such as uplink transmission can be performed in the 9th time slot. For different time division duplex (TDD) configurations, the time interval (K in FIG7 ) can be different. For example, when the TDD ratio is 8:2, the time interval between the time slot (0 in Figure 7) in which the network device sends the synchronization signal and the time slot in which the terminal device sends the first signal can be 8 time slots or 9 time slots, that is, the terminal device can send the first signal in the 8th time slot or the 9th time slot; when the TDD ratio is 4:1, the time interval between the time slot (0 in Figure 7) in which the network device sends the synchronization signal and the time slot in which the terminal device sends the first signal can be 4 time slots, that is, the terminal device can send the first signal in the 4th time slot; when the TDD ratio is 7:3, the time interval between the time slot (0 or 5 in Figure 7) in which the network device sends the synchronization signal and the time slot in which the terminal device sends the first signal can be 4 time slots or 3 time slots, that is, the terminal device can send the first signal in the 4th time slot or the 8th time slot.

[0176] It is understood that the time interval between the network device sending the synchronization signal and the terminal device receiving the system message can be set accordingly based on actual circumstances, and the embodiments of the present application do not impose any limitations thereon. Furthermore, time information can be indicated using N bits, with the value of N being related to the different situations corresponding to the time information and can be set based on the specific situation. For example, the time information includes four situations, such as four different time intervals between the network device sending the synchronization signal and the terminal device receiving the system message. In this case, two bits can be used to indicate the different time intervals, that is, 00, 01, 10, and 11 can be used to indicate these four time intervals, respectively.

[0177] It is also understood that the cell identifier, cell barring identifier, and time information can be carried on either the PSS and / or SSS. That is, the cell identifier, cell barring identifier, and time information can all be carried on the PSS and / or SSS. Alternatively, the cell identifier, cell barring identifier, and time information can be carried in combination on the PSS and / or SSS, as described in detail below.

[0178] In a first possible implementation, the cell identity is carried on the SSS.

[0179] The SSS can have n sequences corresponding to different cell identifiers, where n is the total number of cell identifiers and is an integer greater than 0, such as 1008. The sequence can be a Gold sequence, a Zadoff-Chu (ZC) sequence, or other sequences, without limitation. It is understood that the specific principles of the Gold sequence and the Zadoff-Chu (ZC) sequence can refer to the principles in the prior art and will not be repeated here. In addition, the SSS can also be in other forms, which are not limited in the embodiments of the present application.

[0180] The terminal device can obtain the cell identifier of the cell of the network device by detecting the SSS. Because there are usually many cell identifiers, that is, the indication overhead for indicating the cell identifier is large, therefore, carrying the cell identifier on the SSS can avoid using the PSS to carry the cell identifier, which makes the PSS more complex. In this way, it can be avoided that when the terminal device performs downlink synchronization (coarse synchronization) according to the PSS, the detection complexity of the terminal device is high due to the high complexity of the PSS, resulting in a long downlink synchronization (coarse synchronization) time.

[0181] Optionally, the cell barring identifier and / or time information is carried on the PSS. That is, the PSS may carry the cell barring identifier, time information, or the cell barring identifier and time information. The specific content carried on the PSS may be set accordingly based on actual conditions.

[0182] Furthermore, when the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

[0183] Optionally, the cell prohibition flag and / or time information are carried on the SSS. In other words, the SSS can carry the cell prohibition flag, time information, or the cell prohibition flag and time information. Carrying the cell prohibition flag and / or time information on the SSS can cause the PSS to carry less information. In this way, the high complexity of the PSS can be avoided, allowing the terminal device to complete downlink synchronization faster when performing downlink synchronization based on the PSS.

[0184] Furthermore, when the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

[0185] In a second possible implementation, the cell barring flag and / or time information are carried on the PSS. That is, the PSS may carry the cell barring flag, time information, or the cell barring flag and time information.

[0186] Optionally, when the cell barring flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell barring flag is carried on the SSS.

[0187] It is understood that in the second possible implementation, the cell identity may be carried on the SSS and / or PSS. To avoid high complexity of the PSS, the cell identity may be carried on the SSS.

[0188] In a third possible implementation, the cell barring flag and / or time information is carried on the SSS. That is, the SSS may carry the cell barring flag, time information, or the cell barring flag and time information.

[0189] Optionally, when the cell barring flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell barring flag is carried on the SSS.

[0190] It is understood that in the third possible implementation, the cell identity may be carried on the SSS and / or PSS. To avoid high complexity of the PSS, the cell identity may be carried on the SSS.

[0191] It can be understood that the above content introduces the various information that can be carried by PSS and SSS (acquisition method, cell identifier, cell prohibition identifier and time information). The following introduces the generation method of PSS and SSS carrying various information.

[0192] 1.PSS

[0193] There are n1 sequences in total for PSS, that is, PSS corresponds to n1 sequences. The value of n1 is related to the number of information carried on the PSS and the different situations of each information. For example, if each information has two situations, when the PSS carries 1 information, n1 is 2, that is, 2 sequences can be used to indicate different situations of 1 information; when the PSS carries 2 information, n1 is 4, that is, 4 sequences can be used to indicate different situations of 2 information; when the PSS carries 3 information, n1 is 8, that is, 8 sequences can be used to indicate different situations of 3 information. It can be understood that when the information carried on the PSS includes multiple situations, such as time information including 4 different time intervals, the number of sequences corresponding to the PSS will change accordingly. In addition, the n1 sequences can be orthogonal, and the n1 sequences can be generated based on different cyclic shifts, or generated using different root sequences. The specific implementation can be achieved by reusing the methods in the prior art, which will not be repeated here.

[0194] For example, when the PSS carries the acquisition method and the cell prohibition flag, since the acquisition method includes direct acquisition and indirect acquisition, and the cell prohibition flag includes prohibition and non-prohibition, the PSS has a total of 4 sequences. In this case, the generation method of the PSS can be: PSS (n) = 1-2x(m), m = (n + 29N AC )mod127,N AC ={0,1,2,3}, where x(i+7)=(x(i+4)+x(i))mod 2, [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0195] As shown in Table 1 below, N AC Corresponding to different acquisition methods and cell prohibition signs, for example: when N AC When it is 0, the acquisition mode is indirect acquisition, and the cell prohibition mark is prohibited, that is, the terminal is not allowed to reside; when N AC When it is 1, the acquisition mode is indirect acquisition, and the cell prohibition flag is not prohibited, that is, the terminal is allowed to reside; when N AC When it is 2, the acquisition method is direct acquisition, and the cell prohibition mark is prohibited; when N AC When it is 3, the acquisition mode is indirect acquisition, and the cell prohibition flag is not prohibited. It can be understood that N in Table 1 AC The value and acquisition method of the cell prohibition mark can be interchanged. For example, 0 and 2 are interchanged. When N AC When it is 0, the acquisition method is direct acquisition, the cell prohibition mark is prohibited, when N AC When it is 2, the acquisition method is indirect acquisition, and the cell prohibition mark is prohibited. In other words, you can customize N ACThe acquisition method and cell prohibition identification corresponding to different values ​​are not limited in the embodiments of this application.

[0196] Table 1

[0197] It can be seen that N AC The value of is related to n1, that is, N AC ={0,1,…,n1-1}. When the information carried by PSS changes, the generation method of PSS can be adjusted accordingly, such as changing N AC The value of N, and the value of m AC The coefficient in front is the closest prime number after 127 is divided by n1. For example, when n1 is 2, N AC The previous coefficient can be 61. For example, when n1 is 4, N AC The preceding coefficient can be 29.

[0198] Understandable, N AC The corresponding relationship between the information carried on the PSS (such as the relationship shown in Table 1) can be preset or predefined by the protocol, so that the terminal device can determine the N AC After the value of , the information carried on the PSS can be determined according to the corresponding relationship. In addition, PSS can also be generated in other ways, which are not limited in the embodiments of the present application.

[0199] 2.SSS

[0200] The SSS may include a first sequence and a second sequence. The first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of a cell barring identifier, time information, and an acquisition method. For example, when the SSS carries a cell identifier and time information, the first sequence is used to carry the cell identifier, and the second sequence is used to carry the time information.

[0201] In one possible implementation, the first sequence and the second sequence can be directly combined to form an SSS. For example, the first sequence and the second sequence are both m-sequences, and the two are combined to form a Gold sequence by multiplication. The specific principles of m-sequences and Gold sequences can be referenced to the principles of the prior art and are not further described here.

[0202] In another possible implementation, the second sequence may be used to scramble the first sequence, that is, the second sequence is a scrambling sequence.

[0203] In this case, the SSS sequence can be: SSS (n) = a p (n)b q (n), p={0,1,…,MaxCellId-1}, q={0,1,…,x}.p (n) is the first sequence, and a p (n) can be a Gold sequence or a ZC sequence, and the value of p ranges from 0 to MaxCellId-1, where MaxCellId is the total number of cell identifiers. q (n) is the second sequence (scrambling sequence), and b q (n) can be a Hadamard sequence. The specific principles of the Hadamard sequence can refer to the principles in the prior art and will not be repeated here. The value of q is related to the number of information carried by the second sequence and the different situations of each information. For example, if each information is two situations, when the second sequence carries 1 information, the value of q is 0 or 1; when the second sequence carries 2 information, the value of q is 0 to 3; when the second sequence carries 3 information, the value of q is 0 to 7. It can be understood that when the information carried on the second sequence includes multiple situations, the value of q will change accordingly. It can be seen that the value of x is the total number of different situations minus 1.

[0204] Continuing with the above example, when the SSS carries the cell identity and time information, the SSS sequence can be: SSS (n) = a p (n)b q (n), p={0,1,…,MaxCellId-1}, q={0,1,…,3}. Among them, a p (n) is the first sequence, used to carry the cell identity; b q (n) is the second sequence, used to carry time information. As shown in Table 2 below, q ranges from 0 to 3. Different values ​​of q represent different types of time information. For example, when q is 0, the time information is 3 time slots; when q is 1, the time information is 4 time slots; when q is 2, the time information is 8 time slots; and when q is 3, the time information is 9 time slots. It should be understood that Table 2 is only an example of the correspondence between different values ​​of q and time information. When the second sequence carries different information, the corresponding values ​​of q will change accordingly.

[0205] Table 2

[0206] Understandably, a p The generation of (n) can reuse the existing technology, which will not be described here. N , a p The length of (n) is uncertain. For example, the length of SSS in NR is 127. Therefore, b q (n) It can be a partial sequence or a cyclic repetition based on a short sequence, such as: a p The length of (n) is 127, b q(n) can be a 128-bit Hada code sequence with the first 127 bits, or b q (n) can be repeated cyclically based on the Hadamard code of 64. Taking the Hadamard code sequence based on 128 as an example, b q (n) is generated as follows: q = {0, 1, 2, 3}, S0 = 0, S1 = 31, S2 = 63, S3 = 127. Furthermore, the correspondence between q and the information carried on the SSS (as shown in Table 2) can be preset or predefined by the protocol, so that after determining the value of q, the information carried on the second sequence can be determined. Furthermore, the SSS can be generated in other ways, which are not limited in the embodiments of the present application.

[0207] It can also be understood that when the SSS only carries a cell identifier, or only carries at least one of a cell prohibition identifier, time information, and an acquisition method, the SSS can be represented only by the first sequence, and the specific generation method can reuse the method in the prior art, which will not be repeated here.

[0208] It is also understood that the above description describes how the acquisition method, cell identifier, cell barring identifier, and time information can be carried on the PSS and / or SSS, as well as how the PSS and SSS are generated. The following examples illustrate how each piece of information is carried when the synchronization signal carries different information.

[0209] Example 1: The synchronization signal carries the acquisition method and cell identifier.

[0210] In this case, there are two ways to obtain the synchronization signal bearer and the cell identification, which are described below.

[0211] 1) PSS bearer acquisition method: the SSS carries the cell identity.

[0212] Among them, PSS corresponds to 2 sequences, and these 2 sequences respectively indicate that the terminal device directly receives the system message from the network device, and that the terminal device obtains the system message by sending the first signal. Exemplarily, the correspondence between these 2 sequences and different numerical values ​​(such as 0 and 1) can be set (recorded as correspondence #1), such as sequence #1 corresponds to 0, and sequence #2 corresponds to 1; and then the correspondence between different numerical values ​​and different situations is set (recorded as correspondence #2), such as 0 corresponds to the terminal device directly receiving the system message from the network device, and 1 corresponds to the terminal device obtaining the system message by sending the first signal. In this way, the sequence used by the PSS can be determined according to the actual situation. For example, if the sequence used by the PSS is sequence #1, after receiving the PSS, the terminal device can detect the PSS and obtain the numerical value corresponding to sequence #1, that is, 0; then, it can be determined based on 0 that the system message from the network device is directly received. It can be understood that correspondence #1 and correspondence #2 can be preset or predefined by the protocol.

[0213] In this case, the SSS may only include the first sequence, that is, only the first sequence is used to indicate the cell identity.

[0214] 2) SSS bearer acquisition method and cell identity.

[0215] The first sequence of the SSS indicates a cell identifier, and the second sequence of the SSS indicates an acquisition method. In this case, the PSS may include only one sequence for downlink synchronization (coarse synchronization) of the terminal device.

[0216] Example 2: The synchronization signal carries the acquisition method, cell identifier, and cell prohibition identifier.

[0217] In this case, a time relationship can be pre-set or pre-defined by agreement. For example, the time interval between the time when the network device sends the synchronization signal and the time when the terminal device receives the system message can be pre-defined as 10 time slots. Another example is the time interval between the time when the network device sends the synchronization signal and the time when the terminal device sends the first signal can be pre-defined as 9 time slots. In other words, in this case, the network device does not need to send time information to indicate the time when the terminal device receives the system message or the time when it sends the first signal.

[0218] In Example 2, there are four ways to obtain synchronization signal bearers, cell identification, and cell prohibition identification, which are described below:

[0219] 1) PSS bearer cell prohibition flag, SSS bearer acquisition method and cell identifier.

[0220] The PSS corresponds to two sequences, one indicating whether the network device allows the terminal to reside in the cell (i.e., when the cell barring flag is set to "not prohibited") and the other indicating whether the network device does not allow the terminal to reside in the cell (i.e., when the cell barring flag is set to "prohibited"). The first sequence of the SSS indicates the cell identifier, and the second sequence of the SSS indicates the acquisition method, such as using rows 0 and 63 of the second 128*128 Hadamard sequence.

[0221] 2) PSS bearer acquisition method, SSS bearer cell prohibition flag and cell flag.

[0222] The PSS corresponds to two sequences, one indicating that the terminal device directly receives system messages from the network device and the other indicating that the terminal device obtains system messages by sending a first signal. The first sequence of the SSS indicates the cell identifier, and the second sequence of the SSS indicates the cell barring identifier, such as using the 0th and 63rd rows of the second 128*128 Hadamard sequence.

[0223] 3) PSS bearer acquisition method and cell prohibition identification, SSS bearer cell identification.

[0224] Among them, PSS corresponds to 4 sequences, and the correspondence between each sequence and acquisition method and cell prohibition identifier can be referred to as shown in the aforementioned Table 1. In this case, SSS can only include the first sequence, that is, only the first sequence is used to indicate the cell identifier.

[0225] 4) SSS bearer acquisition method, cell identifier and cell prohibition identifier.

[0226] The first sequence of the SSS indicates the cell identifier, and the second sequence of the SSS indicates the acquisition mode and cell prohibition identifier, such as using the 0th, 31st, 63rd, and 127th rows of the second 128*128 Hadamard sequence for indication. In this case, the PSS may contain only one sequence for downlink synchronization of the terminal device.

[0227] Example 3: The synchronization signal carries the acquisition method, cell identifier, cell prohibition identifier, and time information.

[0228] In this case, there are two ways to obtain synchronization signal carriers, cell identification, cell prohibition identification and time information, which are described below.

[0229] 1) The PSS carries the acquisition method and cell prohibition flag, and the SSS carries the cell flag and time information.

[0230] Among them, PSS corresponds to 4 sequences, and the correspondence between each sequence and the acquisition method and cell prohibition flag can be referred to the aforementioned Table 1. The first sequence of SSS indicates the cell identifier, and the second sequence of SSS indicates time information.

[0231] 2) PSS carries time information, and SSS carries cell identification, acquisition method, and cell prohibition identification.

[0232] The PSS corresponds to L sequences, where the value of L is related to the number of time intervals in the time information. For example, if the time information indicates four time intervals, the PSS corresponds to four sequences. The first sequence of the SSS indicates the cell identifier, and the second sequence of the SSS indicates the acquisition mode and cell barring flag, for example, using rows 0, 31, 63, and 127 of the second 128*128 Hadamard sequence.

[0233] It can be understood that when PSS corresponds to multiple sequences, different situations corresponding to each sequence are set. The implementation principle is similar to the introduction in "Example 1 1)", so you can refer to it for understanding and will not repeat it here.

[0234] It can also be understood that the above-mentioned acquisition method can be configured by default by the network device, or the acquisition method can be dynamically determined by the network device according to actual conditions, which is described in detail below.

[0235] In one possible implementation, the network device may determine the acquisition method based on the number of service users. That is, when the number of service users is greater than or equal to a threshold number, the acquisition method is to directly receive system messages from the network device; or, when the number of service users is less than the threshold number, the acquisition method is to obtain system messages by sending a first signal. This threshold number can be set based on actual circumstances and is not limited in this embodiment of the present application.

[0236] In another possible implementation, the network device may determine the acquisition method based on the amount of user data. That is, when the amount of user data is greater than or equal to a data volume threshold, the acquisition method is to directly receive system messages from the network device; or, when the amount of user data is less than the data volume threshold, the acquisition method is to obtain the system message by sending a first signal. The data volume threshold can be set based on actual circumstances and is not limited in this embodiment of the present application.

[0237] As shown in Figure 8, network devices can choose different acquisition methods for network idle or busy times. For example, when the network is busy, due to a large number of service users or a large amount of user data, the network device can periodically broadcast system messages, and the terminal device can directly receive the system messages. When the network is idle, due to a small number of service users or a small amount of user data, the network device can use on-demand system message transmission, that is, the terminal device sends a first signal, and the network device sends the system message after receiving the first signal. This can better achieve network energy conservation.

[0238] After determining the acquisition method, the network device can send a synchronization signal carrying the acquisition method. Correspondingly, after receiving the synchronization signal from the network device, the terminal device can detect the synchronization signal and obtain the acquisition method.

[0239] S602: The terminal device obtains system information based on the acquisition method.

[0240] Exemplarily, when the acquisition method is to directly receive system messages from a network device, the terminal device can determine at which time unit to receive the system message based on preset or protocol-predefined time information, such as the time interval between the time the network device sends the synchronization signal and the time the terminal device receives the system message, or based on the time information detected in the synchronization signal.

[0241] When the acquisition method is to acquire the system message by sending a first signal, the terminal device can determine the time unit in which to send the first signal based on pre-set or protocol-predefined time information, such as the time interval between the time when the network device sends the synchronization signal and the time when the terminal device sends the first signal, or based on time information detected in the synchronization signal, and send the first signal in the time unit. Accordingly, the network device receives the first signal from the terminal device.

[0242] It can be understood that the above-mentioned time unit can be a radio frame, a subframe, a time slot, or a symbol, and the embodiment of the present application does not limit this.

[0243] It is also understood that when the terminal device transmits the first signal, it may carry information about the optimal beam. The optimal beam may include multiple beams, allowing the network device to select a beam from the optimal beam to transmit the system message. This optimal beam information may be explicitly indicated, such as by carrying a beam index indication in the first signal, or implicitly indicated, such as by synchronizing signals with different beam indices occupying different symbols in the time domain based on the timing relationship between the synchronization signal and the first signal, and accordingly, the transmission of the first signal also corresponds to different symbols.

[0244] S603: The network device sends a system message. The terminal device receives the system message from the network device.

[0245] For example, when the acquisition method is to directly receive system messages from a network device, the network device may repeatedly transmit the system messages using a beam scanning method. Accordingly, the terminal device may receive the system messages. It is understood that the time unit for transmitting system messages may be preset or predefined by a protocol, or determined independently by the network device, and this embodiment of the present application does not impose any limitation thereto.

[0246] When the acquisition method is to acquire the system message by sending a first signal, the network device may send the system message after receiving the first signal from the terminal device. Correspondingly, the terminal device receives the system message.

[0247] In summary, in the embodiments of the present application, the network device can instruct the terminal device which acquisition method to use to obtain system messages by sending a synchronization signal carrying the acquisition method. This ensures that the terminal device uses the correct acquisition method and successfully obtains system messages. Furthermore, the synchronization signal can be reused to indicate the acquisition method of system messages, eliminating the need for additional configuration of the acquisition method, thereby reducing overhead.

[0248] As shown in Figure 9, the embodiment of the present application proposes the following technical solution to reduce the energy consumption of the terminal device. The technical solution will be described below with reference to the accompanying drawings.

[0249] For ease of understanding, the communication method provided in the embodiment of the present application will be specifically described below with reference to FIG9 .

[0250] 9 is a second flow chart of a communication method according to an embodiment of the present application. The method can be applied to the communication between the terminal device and the network device in the above communication system.

[0251] As shown in FIG9 , the process of the above communication method is as follows:

[0252] S901: The network device determines whether the cell of the network device allows the terminal to camp on.

[0253] The network device may determine whether its cell allows the terminal to reside according to actual conditions, and the method by which the network device determines whether its cell allows the terminal to reside may reuse the method in the prior art, which will not be described in detail here.

[0254] S902: The network device sends a synchronization signal, wherein the synchronization signal carries a cell barring flag. Correspondingly, the terminal device receives the synchronization signal from the network device.

[0255] The synchronization signal includes PSS and / or SSS. For PSS and SSS, please refer to the relevant introduction in S601 above and will not be repeated here.

[0256] In a possible implementation, the information carried by the PSS indicates that the synchronization signal includes the SSS. For details, please refer to the relevant introduction in the aforementioned S601, which will not be repeated here.

[0257] The PSS or SSS carries the cell barring flag, that is, the cell barring flag can be carried on the PSS or SSS.

[0258] The cell prohibition flag is used to indicate whether the terminal is allowed to reside in the cell of the network device. The cell prohibition flag is related to the result of S901. That is, if the network device determines in S901 that the terminal is not allowed to reside in the cell of the network device, the cell prohibition flag carried by the synchronization signal is prohibited. Correspondingly, if the network device determines in S901 that the terminal is allowed to reside in the cell of the network device, the cell prohibition flag carried by the synchronization signal is not prohibited. The cell prohibition flag can be referred to the relevant description of S601 above and will not be repeated here.

[0259] By carrying the cell prohibition identifier on the PSS or SSS, the terminal device can obtain the cell prohibition identifier of the cell of the network device by detecting the PSS or SSS after receiving the PSS or SSS, so as to determine whether to access the cell subsequently based on the cell prohibition identifier.

[0260] Optionally, the synchronization signal may also carry at least one of the following: a cell identifier of a cell of the network device, a method for obtaining a system message, and time information. The method for obtaining the system message is any one of the following: directly receiving a system message from the network device, or obtaining the system message by sending a first signal. The system message includes at least one of the following: a system frame number of a cell of the network device, a subcarrier spacing indication, a same-frequency cell reselection identifier, a frequency domain offset between the synchronization signal and the public resource, cell selection information, cell access-related information, service cell configuration information, other system message scheduling information, connection establishment failure control configuration, and terminal timer configuration. The time information is used to indicate the time of directly receiving the system message, or the time of sending the first signal. For the cell identifier, the method for obtaining the system message, and the time information, please refer to the relevant introduction at S601 above, which will not be repeated here.

[0261] It is understood that the cell identifier, acquisition method, and time information can be carried on either the PSS and / or SSS. That is, the cell identifier, acquisition method, and time information can all be carried on the PSS and / or SSS. Alternatively, the cell identifier, acquisition method, and time information can be carried in combination on the PSS and / or SSS, as described in detail below.

[0262] In a first possible implementation, the cell identity is carried on the SSS. For details, please refer to the relevant introduction in the aforementioned S601, which will not be repeated here.

[0263] Optionally, the acquisition method and / or time information is carried on the PSS. That is, the PSS may carry the acquisition method, time information, or both. The specific content carried on the PSS may be configured accordingly based on actual conditions.

[0264] Furthermore, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS.

[0265] Optionally, the acquisition method and / or time information is carried on the SSS. In other words, the SSS may carry the acquisition method, time information, or both. Carrying the acquisition method and / or time information on the SSS allows the PSS to carry less information. This avoids the high complexity of the PSS, allowing the terminal device to complete downlink synchronization more quickly when performing downlink synchronization based on the PSS.

[0266] Furthermore, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS.

[0267] In a second possible implementation, the acquisition mode and / or time information is carried on the PSS.

[0268] Optionally, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS.

[0269] It is understood that in the second possible implementation, the cell identity may be carried on the SSS and / or PSS. To avoid high complexity of the PSS, the cell identity may be carried on the SSS.

[0270] In a third possible implementation, the acquisition mode and / or time information is carried on the SSS.

[0271] Optionally, when the acquisition method is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the acquisition method is carried on the SSS.

[0272] It is understood that in the third possible implementation, the cell identity may be carried on the SSS and / or PSS. To avoid high complexity of the PSS, the cell identity may be carried on the SSS.

[0273] It can be understood that the generation method of PSS and SSS, as well as the carrying method of each information when the synchronization signal carries different information, can refer to the relevant introduction at S601 above, and will not be repeated here.

[0274] It can be seen that the difference between the embodiment of the present application (S902) and the aforementioned embodiment (S601) is that: in the embodiment of the present application, the synchronization signal may include a cell prohibition identifier, or a cell prohibition identifier and other information (recorded as other information #1), and other information #1 includes at least one of a cell identifier, an acquisition method, and time information; in the aforementioned embodiment, the synchronization signal may include an acquisition method, or an acquisition method and other information (recorded as other information #2), and other information #2 includes at least one of a cell identifier, a cell prohibition identifier, and time information. The definition of each information, the generation method of the synchronization signal, and the carrying method in the two embodiments are similar implementation principles, so they can be understood by reference and will not be repeated here.

[0275] After receiving the synchronization signal from the network device, the terminal may detect the synchronization signal to obtain information carried by the synchronization signal, such as a cell barring flag.

[0276] S903: The terminal device determines whether to obtain system information according to the cell prohibition flag.

[0277] For example, if the cell barring flag is set to "barred," it indicates that the network device's cell does not allow the terminal device to reside, meaning the terminal device cannot access the cell. In this case, the terminal device may no longer obtain system messages. Conversely, if the cell barring flag is set to "not barred," it indicates that the network device's cell allows the terminal device to reside, meaning the terminal device can access the cell. In this case, the terminal device may continue to obtain system messages.

[0278] It is understood that if the synchronization signal also carries an acquisition method, the terminal device can directly receive the system message from the network device based on the acquisition method and a predefined time interval, or obtain the system message by sending the first signal. Alternatively, if the synchronization signal also carries an acquisition method and time information, the terminal device can determine the time interval based on the time information, and based on the time interval and the acquisition method, directly receive the system message from the network device, or obtain the system message by sending the first signal.

[0279] In summary, by carrying the cell barring indicator on the synchronization signal, the terminal device can obtain the cell barring indicator after detecting the synchronization signal. In other words, in this case, the receiving end no longer needs to receive and demodulate the PBCH to obtain the cell barring indicator. This can reduce the energy consumption of the terminal device.

[0280] The communication method provided in the embodiment of the present application is described in detail above in conjunction with Figures 6 to 8. The communication device for executing the communication method provided in the embodiment of the present application is described in detail below in conjunction with Figures 10 and 11.

[0281] Figure 10 is a structural diagram of a communication device according to an embodiment of the present application. As shown in Figure 10 , the communication device 1000 includes a transceiver module 1001 and a processing module 1002. For ease of illustration, Figure 10 only shows the main components of the communication device.

[0282] In some embodiments, the communication device 1000 may be applicable to the communication system shown in FIG. 4 , and perform the functions of the terminal device in the communication method shown in FIG. 6 .

[0283] The transceiver module 1001 is used to receive a synchronization signal from a network device, where the synchronization signal carries a method for obtaining a system message; and the processing module 1002 is used to obtain the system message based on the method.

[0284] In a possible design solution, the acquiring method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

[0285] In one possible design scheme, the synchronization signal includes PSS and SSS, and the acquisition method is carried on PSS, or the acquisition method is carried on SSS.

[0286] Optionally, the synchronization signal also carries at least one of the following: a cell identifier of the cell of the network device, a cell prohibition identifier, and time information; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time for directly receiving the system message, or the time for sending the first signal.

[0287] Furthermore, the cell identity is carried on the SSS.

[0288] Furthermore, the cell barring flag and / or time information is carried on the PSS.

[0289] Furthermore, the cell barring flag and / or time information is carried on the SSS.

[0290] Furthermore, when the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

[0291] Furthermore, the SSS includes a first sequence and a second sequence, the first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of a cell prohibition identifier, time information, and an acquisition method.

[0292] Furthermore, the second sequence is used to scramble the first sequence.

[0293] Furthermore, the second sequence is a Hadamard sequence.

[0294] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS.

[0295] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0296] Optionally, the transceiver module 1001 may include a sending module (not shown in FIG10 ) and a receiving module (not shown in FIG10 ). The sending module is used to implement the sending function of the communication device 1000 , and the receiving module is used to implement the receiving function of the communication device 1000 .

[0297] Optionally, the communication device 1000 may further include a storage module (not shown in FIG10 ) storing a program or instruction. When the processing module 1002 executes the program or instruction, the communication device 1000 may perform the functions of the remote UE or remote device in the method shown in FIG6 in the above method.

[0298] It can be understood that the communication device 1000 can be a terminal, such as a remote UE or remote device, or a chip (system) or other parts or components that can be set in the terminal, or a device including a terminal, which is not limited in this application.

[0299] In addition, the technical effects of the communication device 1000 can refer to the technical effects of the communication method shown in Figures 6 to 8, and will not be repeated here.

[0300] In some embodiments, the communication device 1000 may be applicable to the communication system shown in FIG. 4 to perform the functions of the network device in the method shown in FIG. 6 .

[0301] The processing module 1002 is configured to control the transceiver module 1001 to send a synchronization signal carrying a method for obtaining a system message; and to send the system message.

[0302] In a possible design solution, the acquiring method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

[0303] In one possible design scheme, the synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

[0304] Optionally, the synchronization signal also carries at least one of the following: a cell identifier of the cell of the network device, a cell prohibition identifier, and time information; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time for directly receiving the system message, or the time for sending the first signal.

[0305] Furthermore, the cell identity is carried on the SSS.

[0306] Furthermore, the cell barring flag and / or time information is carried on the PSS.

[0307] Furthermore, the cell barring flag and / or time information is carried on the SSS.

[0308] Furthermore, when the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or, when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

[0309] Furthermore, the SSS includes a first sequence and a second sequence, the first sequence is used to carry a cell identifier, and the second sequence is used to carry at least one of a cell prohibition identifier, time information, and an acquisition method.

[0310] Furthermore, the second sequence is used to scramble the first sequence.

[0311] Furthermore, the second sequence is a Hadamard sequence.

[0312] Optionally, the information carried by the PSS indicates that the synchronization signal includes an SSS.

[0313] In one possible design scheme, the system message includes at least one of the following: the system frame number of the cell of the network device, the subcarrier spacing indication, the same-frequency cell reselection identifier, the frequency domain offset of the synchronization signal and the public resource, the cell selection information, the cell access-related information, the service cell configuration information, other system message scheduling information, the connection establishment failure control configuration, and the terminal timer configuration.

[0314] In one possible design scheme, when the number of service users is greater than or equal to a number threshold, the acquisition method is to directly receive system messages from the network device; or, when the number of service users is less than the number threshold, the acquisition method is to obtain system messages by sending a first signal.

[0315] Optionally, the transceiver module 1001 may include a sending module (not shown in FIG10 ) and a receiving module (not shown in FIG10 ). The sending module is used to implement the sending function of the communication device 1000 , and the receiving module is used to implement the receiving function of the communication device 1000 .

[0316] Optionally, the communication device 1000 may further include a storage module (not shown in FIG10 ) storing a program or instruction. When the processing module 1002 executes the program or instruction, the communication device 1000 may perform the functions of the remote UE or remote device in the method shown in FIG6 in the above method.

[0317] It can be understood that the communication device 1000 can be a terminal, such as a remote UE or remote device, or a chip (system) or other parts or components that can be set in the terminal, or a device including a terminal, which is not limited in this application.

[0318] In addition, the technical effects of the communication device 1000 can refer to the technical effects of the communication method shown in Figures 6 to 8, and will not be repeated here.

[0319] It can be understood that in the embodiment of the present application, the communication device can also be the O-CU, O-DU, or O-RU in the aforementioned ORAN, or a combination of O-CU, O-DU, or O-RU.

[0320] For example, in some embodiments, the O-RU may send a synchronization signal carrying a method for obtaining system messages; the O-CU generates system messages, and the O-DU and O-RU send system messages.

[0321] Figure 11 is a second structural diagram of a communication device provided in an embodiment of the present application. Exemplarily, the communication device may be a terminal, or a chip (system) or other component or assembly that can be provided in a terminal. As shown in Figure 11, the communication device 1100 may include a processor 1101. Optionally, the communication device 1100 may further include a memory 1102 and / or a transceiver 1103. The processor 1101 is coupled to the memory 1102 and the transceiver 1103, such as by a communication bus.

[0322] The following is a detailed introduction to the various components of the communication device 1100 with reference to FIG11 :

[0323] The processor 1101 is the control center of the communication device 1100 and can be a single processor or a collective term for multiple processing elements. For example, the processor 1101 can be one or more central processing units (CPUs), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more digital signal processors (DSPs) or one or more field programmable gate arrays (FPGAs).

[0324] Optionally, the processor 1101 may execute various functions of the communication device 1100 , such as executing the communication method shown in FIG. 6 , by running or executing a software program stored in the memory 1102 and calling data stored in the memory 1102 .

[0325] In a specific implementation, as an embodiment, the processor 1101 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG11 .

[0326] In a specific implementation, as an embodiment, the communication device 1100 may also include multiple processors, such as the processor 1101 and the processor 1104 shown in FIG11 . Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0327] Among them, the memory 1102 is used to store the software program for executing the solution of this application, and the execution is controlled by the processor 1101. The specific implementation method can refer to the above method embodiment and will not be repeated here.

[0328] Alternatively, the memory 1102 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, an optical disc storage (including a compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 1102 may be integrated with the processor 1101 or exist independently and be coupled to the processor 1101 via an interface circuit (not shown in FIG. 11 ) of the communication device 1100, which is not specifically limited in this embodiment of the present application.

[0329] Transceiver 1103 is used for communication with other communication devices. For example, if communication device 1100 is a terminal, transceiver 1103 can be used to communicate with a network device or another terminal device. For another example, if communication device 1100 is a network device, transceiver 1103 can be used to communicate with a terminal or another network device.

[0330] Optionally, the transceiver 1103 may include a receiver and a transmitter (not shown separately in FIG11 ), wherein the receiver is used to implement a receiving function, and the transmitter is used to implement a transmitting function.

[0331] Optionally, the transceiver 1103 may be integrated with the processor 1101 or exist independently and be coupled to the processor 1101 through an interface circuit (not shown in FIG. 11 ) of the communication device 1100 . This embodiment of the present application does not specifically limit this.

[0332] It is understandable that the structure of the communication device 1100 shown in FIG11 does not constitute a limitation on the communication device, and an actual communication device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0333] In addition, the technical effects of the communication device 1100 can refer to the technical effects of the methods described in the above method embodiments, and will not be repeated here.

[0334] It should be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0335] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0336] The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (such as infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0337] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. A and B can be singular or plural. Furthermore, the character " / " as used herein generally indicates an "or" relationship between the associated objects, but it may also indicate an "and / or" relationship. For specific understanding, please refer to the context.

[0338] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0339] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0340] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0341] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0342] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0343] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0344] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0345] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0346] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: The method comprises: receiving a synchronization signal from a network device, wherein the synchronization signal carries a method for obtaining a system message; Based on the acquisition method, the system message is acquired.

2. The method according to claim 1, characterized in that The acquisition method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

3. The method according to claim 1 or 2, characterized in that: The synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

4. The method according to claim 3, characterized in that: The synchronization signal also carries at least one of the following: a cell identifier, a cell prohibition identifier, and time information of the cell of the network device; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time to directly receive the system message, or the time to send the first signal.

5. The method according to claim 4, characterized in that The cell identity is carried on the SSS.

6. The method according to claim 4 or 5, characterized in that: The cell prohibition flag and / or the time information are carried on the PSS.

7. The method according to claim 4 or 5, characterized in that: The cell prohibition flag and / or the time information are carried on the SSS.

8. The method according to claim 6 or 7, characterized in that: When the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

9. The method according to any one of claims 5 to 8, characterized in that: The SSS includes a first sequence and a second sequence, the first sequence is used to carry the cell identifier, and the second sequence is used to carry at least one of the cell prohibition identifier, the time information, and the acquisition method.

10. The method according to claim 9, characterized in that The second sequence is used to scramble the first sequence.

11. The method according to any one of claims 3 to 10, characterized in that: The information carried by the PSS indicates that the synchronization signal includes the SSS.

12. A communication method, characterized in that: The method comprises: Sending a synchronization signal carrying a method for obtaining system messages; The system message is sent.

13. The method according to claim 12, characterized in that The acquisition method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

14. The method according to claim 12 or 13, characterized in that The synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

15. The method according to claim 14, characterized in that The synchronization signal also carries at least one of the following: a cell identifier, a cell prohibition identifier, and time information of the cell of the network device; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time to directly receive the system message, or the time to send the first signal.

16. The method according to claim 15, characterized in that The cell identity is carried on the SSS.

17. The method according to claim 15 or 16, characterized in that The cell prohibition flag and / or the time information are carried on the PSS.

18. The method according to claim 15 or 16, characterized in that The cell prohibition flag and / or the time information are carried on the SSS.

19. The method according to claim 17 or 18, characterized in that When the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

20. The method according to any one of claims 16 to 19, characterized in that The SSS includes a first sequence and a second sequence, the first sequence is used to carry the cell identifier, and the second sequence is used to carry at least one of the cell prohibition identifier, the time information, and the acquisition method.

21. The method according to claim 20, characterized in that The second sequence is used to scramble the first sequence.

22. The method according to any one of claims 14 to 21, characterized in that The information carried by the PSS indicates that the synchronization signal includes the SSS.

23. A communication device, characterized in that: The device comprises: A transceiver module, used for receiving a synchronization signal from a network device, wherein the synchronization signal carries a method for obtaining a system message; A processing module is used to obtain the system message based on the acquisition method.

24. The device according to claim 23, characterized in that The acquisition method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

25. The device according to claim 23 or 24, characterized in that The synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

26. The device according to claim 25, characterized in that The synchronization signal also carries at least one of the following: a cell identifier, a cell prohibition identifier, and time information of the cell of the network device; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time to directly receive the system message, or the time to send the first signal.

27. The device according to claim 26, characterized in that The cell identity is carried on the SSS.

28. The device according to claim 26 or 27, characterized in that The cell prohibition flag and / or the time information are carried on the PSS.

29. The device according to claim 26 or 27, characterized in that The cell prohibition flag and / or the time information are carried on the SSS.

30. The device according to claim 28 or 29, characterized in that When the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

31. The device according to any one of claims 27 to 30, characterized in that The SSS includes a first sequence and a second sequence, the first sequence is used to carry the cell identifier, and the second sequence is used to carry at least one of the cell prohibition identifier, the time information, and the acquisition method.

32. The device according to claim 31, characterized in that The second sequence is used to scramble the first sequence.

33. The device according to any one of claims 25 to 32, characterized in that The information carried by the PSS indicates that the synchronization signal includes the SSS.

34. A communication device, characterized in that: The device comprises: The processing module is used to control the transceiver module to send a synchronization signal carrying a method for obtaining a system message; and send the system message.

35. The device according to claim 34, characterized in that The acquisition method is any one of the following: directly receiving the system message from the network device, or acquiring the system message by sending a first signal.

36. The device according to claim 34 or 35, characterized in that The synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and the acquisition method is carried on the PSS, or the acquisition method is carried on the SSS.

37. The device according to claim 36, characterized in that The synchronization signal also carries at least one of the following: a cell identifier, a cell prohibition identifier, and time information of the cell of the network device; wherein the cell prohibition identifier is used to indicate whether the cell of the network device allows the terminal to reside, and the time information is used to indicate the time to directly receive the system message, or the time to send the first signal.

38. The device according to claim 37, characterized in that The cell identity is carried on the SSS.

39. The device according to claim 37 or 38, characterized in that The cell prohibition flag and / or the time information are carried on the PSS.

40. The device according to claim 37 or 38, characterized in that The cell prohibition flag and / or the time information are carried on the SSS.

41. The device according to claim 39 or 40, characterized in that When the cell prohibition flag is carried on the PSS, the time information is carried on the SSS; or when the time information is carried on the PSS, the cell prohibition flag is carried on the SSS.

42. The device according to any one of claims 38 to 41, characterized in that The SSS includes a first sequence and a second sequence, the first sequence is used to carry the cell identifier, and the second sequence is used to carry at least one of the cell prohibition identifier, the time information, and the acquisition method.

43. The device according to claim 42, characterized in that The second sequence is used to scramble the first sequence.

44. The device according to any one of claims 36 to 43, characterized in that The information carried by the PSS indicates that the synchronization signal includes the SSS.

45. A communication device, characterized in that: The communication device comprises: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method as described in any one of claims 1-11, or executes the method as described in any one of claims 12-22.

46. ​​A communication chip, characterized in that: Instructions are stored therein, and when the chip runs on a communication device, the method according to any one of claims 1 to 11 or the method according to any one of claims 12 to 22 is implemented.

47. A communication system, characterized in that: The communication system comprises: an apparatus for executing the method according to any one of claims 1 to 11, and / or an apparatus for executing the method according to any one of claims 12 to 22.

48. A computer-readable storage medium, characterized in that The computer-readable storage medium comprises a computer program or an instruction. When the computer program or the instruction is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 11, or execute the method according to any one of claims 12 to 22.

49. A computer program product, characterized in that The computer program product comprises a computer program or instructions, and when the computer program or instructions are executed by a communication device, the method according to any one of claims 1 to 11 or the method according to any one of claims 12 to 22 is executed.

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