Communication method and apparatus for access

Abstract

The embodiments of the present application relate to the field of wireless communications, and provide a communication method and apparatus for access, which can enable access for small-bandwidth terminal devices. The method comprises: receiving a PBCH, and receiving random access information according to the PBCH. The PBCH is configured for carrying first information and second information, wherein the first information is obtained by performing rate matching on a coded bit output by channel coding, the first information indicates a time-frequency resource configured for carrying random access information, the second information is a redundant part obtained by performing redundancy coding on the first information, the total number of REs occupied by the first information and the second information is X times the number of REs occupied by the first information, and X is a positive integer greater than 1.

Description

Communication method and apparatus for access

[0001] The present application claims priority from the Chinese patent application No. 202411258950.4 filed with the State Intellectual Property Office on September 6, 2024 and entitled "Communication method and apparatus for access", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of wireless communication, and more particularly, to a communication method and apparatus for access. BACKGROUND

[0003] When initially accessing, a terminal needs some minimum system information in order to synchronize the terminal and configure the terminal to communicate with the system. Part of the system information can be provided through a periodically broadcasted synchronization signal block (SSB) (or also referred to as a synchronization signal / physical broadcast channel block (SS / PBCH block)). The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0004] In the time domain, the SSB occupies 4 orthogonal frequency division multiplexing (OFDM) symbols; the first OFDM symbol is used to carry the PSS, the second and fourth OFDM symbols are used to carry the PBCH, and the third OFDM symbol is used to carry the SSS signal and part of the PBCH. In the frequency domain, the SSB occupies 240 subcarriers. Taking one resource block (RB) including 12 subcarriers as an example, the SSB occupies 20 RBs in the frequency domain.

[0005] Therefore, the bandwidth of the terminal needs to meet 20 RBs to receive the SSB, that is, when the bandwidth of the terminal is less than 20 RBs, the complete SSB cannot be received; that is, a small-bandwidth terminal device (such as a terminal device with a bandwidth less than 20 RBs) cannot implement access based on the SSB. SUMMARY

[0006] The application provides a communication method and device for access, which can realize access of a small-bandwidth terminal device.

[0007] In a first aspect, an embodiment of the application provides a communication method for access, which can be executed by a terminal-side communication device. In the absence of special description, the "terminal-side communication device" in the application can refer to a terminal device, a component (for example, a communication module, a processor, a circuit, a chip, or a chip system) in the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device. The method comprises the following steps: receiving a physical broadcast channel (PBCH), and receiving random access information according to the PBCH. The PBCH is used to carry first information and second information. The first information is obtained by rate matching of channel coding output coding bits, and the first information indicates time-frequency resources for carrying random access information. The second information is a redundant part obtained by redundancy coding of the first information. The total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the first information, and X is a positive integer greater than 1.

[0008] Based on the scheme, the terminal device can receive the PBCH from the network device. The PBCH is used to carry effective information (that is, the first information, which is obtained by rate matching of channel coding output coding bits, and the first information indicates time-frequency resources for carrying random access information) and redundant information (the second information, which is a redundant part obtained by redundancy coding of the first information). The total number of resource elements (REs) occupied by the effective information and the redundant information is X times the number of REs occupied by the effective information, and X is a positive integer greater than 1.

[0009] That is, the number of REs occupied by the valid information is less than the number of REs occupied by the redundant information; therefore, even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, the time-frequency resource used to carry the random access information can be acquired, so that the random access information is received on the time-frequency resource used to carry the random access information, and the random access is initiated based on the random access information, so that the terminal device accesses the network. In other words, for a terminal device with a small bandwidth (such as a terminal device whose bandwidth contains a number of REs less than the total number of resource elements REs occupied by the valid information and the redundant information), the terminal device can access the network as long as the valid information is received; therefore, the network device can set appropriate time-frequency resources for the valid information, so that the valid information mapped on the time-frequency resources can be successfully received by the terminal device with a small bandwidth, so that the terminal device with a small bandwidth accesses the network. In one possible design, when the bandwidth of the terminal device is greater than or equal to a preconfigured bandwidth, receiving the PBCH includes: receiving a synchronization signal, the synchronization signal including the PBCH, the PBCH carrying the first information and the second information; the communication method further includes: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information; and performing redundant decoding on the first information and the second information to obtain the first information.

[0010] In one possible design, when the bandwidth of the terminal device is less than the preconfigured bandwidth, receiving the PBCH includes: receiving a synchronization signal, the synchronization signal including the PBCH, the PBCH carrying the first information; the communication method further includes: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0011] Based on the above two possible designs, after receiving the synchronization signal from the network device, the terminal device can determine whether the complete PBCH (i.e., carrying the first information and the second information) is received according to the size relationship between the bandwidth receiving capability of the terminal device and the preconfigured bandwidth. And according to the determination result, a suitable processing manner is selected to process the synchronization signal, so as to obtain the first information; since the first information indicates the time-frequency resource used to carry the random access information, therefore, the terminal device can receive the random access information on the time-frequency resource used to carry the random access information, and initiate the random access based on the random access information, so that the terminal device accesses the network. That is, in this application, terminal devices with different bandwidths can access the network.

[0012] For example, when the bandwidth of the terminal device is less than the preconfigured bandwidth, it indicates that the terminal device cannot receive the redundancy information carried by the PBCH, but the first information carried by the PBCH is valid information (i.e., the PBCH carries the first information (the first information is the coded bits obtained by rate matching the output of channel coding) and the second information (the second information is the redundancy part obtained by redundancy coding the first information; wherein the total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the valid information, and X is a positive integer greater than 1)), so even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, i.e., the time-frequency resource used to carry the random access information can be obtained, the random access information can be received based on the time-frequency resource used to carry the random access information, and the random access can be initiated based on the random access information, so that the terminal device accesses the network. When the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, it indicates that the terminal device can receive the complete PBCH (i.e., carrying the valid information and the redundancy information), so the second information obtained by redundancy coding is also carried in the PBCH, so the PBCH also needs to be inversely redundancy coded (i.e., redundancy decoded) during the receiving process to remove the second information, thereby obtaining the first information; and further accessing the network.

[0013] In a second aspect, an embodiment of the present application provides a communication method for access, which can be executed by a network side communication device. In the absence of special description, the "network side communication device" in the present application can refer to a network device, a component (such as a communication module, a processor, a circuit, a chip, or a chip system) in the network device, or a logic module or software capable of realizing all or part of the functions of the network device. The method comprises: transmitting a PBCH and transmitting random access information. The PBCH is used to carry first information and second information. The first information is obtained by rate matching the output of channel coding, and indicates a time-frequency resource used to carry the random access information. The second information is a redundancy part obtained by redundancy coding the first information. The total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the first information, and X is a positive integer greater than 1.

[0014] Based on the scheme, the network device can transmit the PBCH to the terminal device, so that the terminal device receives the PBCH from the network device. The PBCH carries valid information (i.e., the first information, which is obtained by rate matching the output of channel coding, and indicates a time-frequency resource used to carry the random access information) and redundancy information (i.e., the second information, which is a redundancy part obtained by redundancy coding the first information). The total number of resource elements (REs) occupied by the valid information and the redundancy information is X times the number of REs occupied by the valid information, and X is a positive integer greater than 1.

[0015] That is, the number of REs occupied by the valid information is less than the number of REs occupied by the redundant information; therefore, even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, the time-frequency resource used to carry the random access information can be acquired, so that the random access information is received on the time-frequency resource used to carry the random access information, and the random access is initiated based on the random access information, so that the terminal device accesses the network. In other words, for a terminal device with a small bandwidth (such as a terminal device whose bandwidth contains a number of REs less than the total number of resource elements REs occupied by the valid information and the redundant information), the terminal device can access the network as long as the valid information is received; therefore, the network device can set appropriate time-frequency resources for the valid information, so that the valid information mapped on the time-frequency resources can be successfully received by the terminal device with a small bandwidth, so that the terminal device with a small bandwidth accesses the network.

[0016] In a third aspect, an embodiment of the present application provides a communication method for access, which can be executed by a terminal-side communication apparatus. In the present application, the "terminal-side communication apparatus" can refer to a terminal device, a component (such as a communication module, a processor, a circuit, a chip, or a chip system) in the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device. The method comprises the following steps: receiving a synchronization signal; processing the synchronization signal according to the size relationship between the bandwidth of the terminal device and a preconfigured bandwidth to obtain first information; and receiving random access information according to the first information. The synchronization signal comprises a PBCH, the PBCH is used to carry the first information and second information, the first information is obtained by rate matching the coded bits output by channel coding, the first information indicates a time-frequency resource used to carry the random access information, the second information is a redundant part obtained by redundantly encoding the first information, the total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the first information, and X is a positive integer greater than 1.

[0017] Based on the scheme, after receiving the synchronization signal from the network device, the terminal device can determine whether the complete PBCH is received according to the size relationship between the bandwidth receiving capability of the terminal device and the preconfigured bandwidth, and process the synchronization signal according to the determination result to obtain the first information. Since the first information indicates the time-frequency resource used to carry the random access information, the terminal device can receive the random access information on the time-frequency resource used to carry the random access information, and initiate the random access based on the random access information, so that the terminal device accesses the network. That is, the terminal devices with different bandwidths can access the network in the present application.

[0018] Exemplarily, when the bandwidth of the terminal device is less than the preconfigured bandwidth, it indicates that the terminal device cannot receive the redundancy information (i.e., the second information) carried by the PBCH, but the first information carried by the PBCH is valid information (i.e., the PBCH carries the first information (the first information is coded bits output by channel coding after rate matching) and the second information (the second information is a redundancy part of the first information obtained after redundancy coding; wherein the total number of resource elements (REs) occupied by the first information and the second information is X times of the number of REs occupied by the valid information, and X is a positive integer greater than 1)), so even if the terminal device cannot receive the redundancy information, as long as the valid information is received, i.e., the time-frequency resource for carrying the random access information can be obtained, the random access information is received based on the time-frequency resource for carrying the random access information, and the random access is initiated based on the random access information, so that the terminal device accesses the network.

[0019] When the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, it indicates that the terminal device can receive the complete PBCH (i.e., the valid information and the redundancy information), at this time, the PBCH also carries the second information obtained after redundancy coding, so in the receiving process, the PBCH also needs to be subjected to inverse redundancy coding (i.e., redundancy decoding) to remove the second information, so as to obtain the first information; and further access the network.

[0020] In a possible design, when the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the PBCH carries the first information and the second information; the first information is obtained by processing the synchronization signal, including: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information; and performing redundancy decoding on the first information and the second information to obtain the first information.

[0021] Based on the possible design, when the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, it indicates that the terminal device can receive the complete PBCH (i.e., the valid information and the redundancy information), at this time, the PBCH also carries the second information obtained after redundancy coding, so in the receiving process, the PBCH also needs to be subjected to inverse redundancy coding (i.e., redundancy decoding) to remove the second information, so as to obtain the first information; and further access the network.

[0022] In a possible design, when the bandwidth of the terminal device is less than the preconfigured bandwidth, the PBCH carries the first information; the first information is obtained by processing the synchronization signal, including: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0023] Based on the possible design, when the bandwidth of the terminal device is less than the preconfigured bandwidth, it indicates that the terminal device cannot receive the redundancy information (i.e., the second information) carried by the PBCH, but the first information carried by the PBCH is valid information (i.e., the PBCH carries the first information (the first information is the coded bits output by channel coding after rate matching) and the second information (the second information is the redundancy part of the first information obtained after redundancy coding; wherein the total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the valid information, and X is a positive integer greater than 1)), so even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, i.e., the time-frequency resource used to carry the random access information can be obtained, the random access information can be received based on the time-frequency resource used to carry the random access information, and the random access can be initiated based on the random access information, so that the terminal device accesses the network.

[0024] In combination with the first aspect to the third aspect, in a possible design, the PBCH is used to carry the first information and the second information, which can be understood as that the function of the PBCH is to carry the first information and the second information, but the PBCH received by the terminal device does not necessarily carry the first information and the second information. For example, whether the PBCH received by the terminal device carries the first information and the second information can be determined according to the size relationship between the bandwidth of the terminal device and the bandwidth occupied by the PBCH (i.e., the bandwidth occupied by the first information and the second information, such as the preconfigured bandwidth).

[0025] For example, when the bandwidth of the terminal device is greater than or equal to the bandwidth occupied by the PBCH, the terminal device can receive the PBCH carrying the first information and the second information. That is, at this time, the PBCH carries the first information and the second information. When the bandwidth of the terminal device is less than the bandwidth occupied by the PBCH, the terminal device can only receive the PBCH carrying the first information. That is, at this time, the PBCH only carries the first information. In combination with the first aspect to the third aspect, in a possible design, the first information is carried in the first RB set, and the number of RBs in the first RB set is less than the number of RBs in the preconfigured bandwidth.

[0026] Based on the possible design, it can be understood that the preconfigured bandwidth is usually the bandwidth of the signal sent by the network device to the terminal device, such as the bandwidth of the PBCH, so that the number of RBs in the first RB set used to carry the first information is less than the number of RBs in the preconfigured bandwidth, thereby ensuring that the terminal device can successfully receive the first information.

[0027] In combination with the first aspect to the third aspect, in a possible design, the maximum index of the RB in the first RB set is less than the maximum index of the RB in the preconfigured bandwidth, and / or the minimum index of the RB in the first RB set is greater than the minimum index of the RB in the preconfigured bandwidth.

[0028] Based on the possible design, the first RB set can be located at any position in the preconfigured bandwidth. As the maximum index of the RB in the first RB set is less than the maximum index of the RB in the preconfigured bandwidth, and / or the minimum index of the RB in the first RB set is greater than the minimum index of the RB in the preconfigured bandwidth. Different implementation schemes are provided for the network device to send the first information on the PBCH.

[0029] In combination with the first aspect to the third aspect, in a possible design, the second information is carried in a second RB set, and the second RB set does not overlap with the first RB set, and the first RB set is used to carry the first information.

[0030] Based on the possible design, the position of the second RB set is different from the position of the first RB set, so as to avoid that the terminal device fails to successfully receive the first information due to the overlap between the first RB set and the second RB set.

[0031] In combination with the first aspect to the third aspect, in a possible design, the second RB set includes a first RB subset and a second RB subset; the maximum index of the RB in the first RB subset is less than the minimum index in the first RB set, and the minimum index of the RB in the first RB subset is greater than or equal to the minimum index of the RB in the preconfigured bandwidth; and / or the minimum index of the RB in the second RB subset is greater than the maximum index in the first RB set, and the maximum index of the RB in the second RB subset is less than or equal to the maximum index of the RB in the preconfigured bandwidth.

[0032] Based on the possible design, the second RB set includes the first RB subset and the second RB subset; and the first RB subset and the second RB subset can be located at two ends of the frequency domain position of the first RB set, so that when the bandwidth of the terminal device is small, the second information can be discarded preferentially, and the probability of successfully receiving the first information is improved.

[0033] In combination with the first aspect to the third aspect, in a possible design, any RB in the first RB set and the second RB set includes a first RE set and a second RE set; the first RE set in the first RB set is used to carry the first information, the first RE set in the second RB set is used to carry the second information, and the second RE set is used to carry a reference signal.

[0034] In combination with the first aspect to the third aspect, in a possible design, the frequency domain position of the second RE set is related to a cell identifier corresponding to the network device.

[0035] In a fourth aspect, a communication apparatus is provided for implementing various methods. The communication apparatus can be the terminal-side communication apparatus in the first aspect or the third aspect, or the network-side communication apparatus in the second aspect, or a chip or chip system included in the terminal-side communication apparatus or the network-side communication apparatus. The communication apparatus includes modules, units, or means corresponding to the methods, which can be implemented by hardware, software, or by a combination of hardware and software.

[0036] In some possible design, the communication apparatus can include a processing module and a transceiver module. The processing module can be configured to implement the processing functions in any of the above aspects and any possible implementation thereof. The transceiver module can include a receiving module and a sending module, which are configured to implement the receiving function and the sending function in any of the above aspects and any possible implementation thereof.

[0037] In some possible design, the transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0038] In a fifth aspect, a communication apparatus is provided, including a processor and a memory. The memory is configured to store computer instructions, which, when executed by the processor, cause the communication apparatus to perform the method in any of the above aspects. The communication apparatus can be the terminal-side communication apparatus in the first aspect or the third aspect, or the network-side communication apparatus in the second aspect, or a chip or chip system included in the terminal-side communication apparatus or the network-side communication apparatus. The communication apparatus includes modules, units, or means corresponding to the methods, which can be implemented by hardware, software, or by a combination of hardware and software. The hardware or software includes one or more modules or units corresponding to the functions.

[0039] In a sixth aspect, a communication apparatus is provided, including a processor and a communication interface. The communication interface is configured to communicate with modules outside the communication apparatus. The processor is configured to execute computer programs or instructions, so as to cause the communication apparatus to perform the method in any of the above aspects. The communication apparatus can be the terminal-side communication apparatus in the first aspect or the third aspect, or the network-side communication apparatus in the second aspect, or a chip or chip system included in the terminal-side communication apparatus or the network-side communication apparatus. The communication apparatus includes modules, units, or means corresponding to the methods, which can be implemented by hardware, software, or by a combination of hardware and software. The hardware or software includes one or more modules or units corresponding to the functions.

[0040] In a seventh aspect, a communication apparatus is provided, which comprises at least one processor; the processor is configured to execute computer programs or instructions, so that the communication apparatus performs the method in any one of the aspects. The communication apparatus can be the terminal-side communication apparatus in the first aspect or the third aspect, or the network-side communication apparatus in the second aspect, or a device included in the terminal-side communication apparatus or the network-side communication apparatus, such as a chip or a chip system. The communication apparatus comprises modules, units or means corresponding to the method, which can be implemented by hardware, software or by executing corresponding software by hardware. The hardware or software comprises one or more modules or units corresponding to the functions.

[0041] In some possible designs, the communication apparatus comprises a memory, which is configured to store necessary programs, instructions and / or data. The memory can be coupled with the processor, or can be independent of the processor.

[0042] In some possible designs, when the apparatus is a chip system, the apparatus can be composed of a chip, or can comprise a chip and other discrete devices.

[0043] It can be understood that, when the communication apparatus in any one of the fourth aspect to the seventh aspect is a chip, the sending action / function of the communication apparatus can be understood as outputting information, and the receiving action / function of the communication apparatus can be understood as inputting information.

[0044] The terminal-side communication apparatus can be a terminal device, or a communication module in the terminal device, or a chip responsible for communication functions in the terminal device, such as a modem chip (also referred to as a baseband chip), or a system on chip (SoC) chip or a system in a package (SIP) chip comprising a modem module.

[0045] In addition, the network-side communication apparatus can be a network device, or a communication module in the network device, or a circuit or chip responsible for communication functions in the network device, or a functional module capable of invoking and executing programs in the network device.

[0046] In an eighth aspect, a computer-readable storage medium is provided, which stores computer programs or instructions, and when the computer programs or instructions are executed on a communication apparatus, the communication apparatus can perform the method in any one of the aspects.

[0047] In a ninth aspect, a computer program product is provided, which comprises instructions, and when the instructions are executed on a communication apparatus, the communication apparatus can perform the method in any one of the aspects.

[0048] In a tenth aspect, a communication system is provided, which includes the terminal-side communication apparatus (or an apparatus included in the terminal-side communication apparatus, such as a chip or a chip system) in the first aspect or the third aspect and the network-side communication apparatus (or an apparatus included in the network-side communication apparatus, such as a chip or a chip system) in the second aspect.

[0049] The technical effects brought by any one of the fourth aspect to the tenth aspect can refer to the technical effects brought by the first aspect or the second aspect or the third aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0050] FIG. 1 is a schematic diagram of an architecture of a wireless communication system suitable for embodiments of the present application;

[0051] FIG. 2 is another schematic diagram of an architecture of a wireless communication system suitable for embodiments of the present application;

[0052] FIG. 3 is a schematic diagram of yet another architecture of a wireless communication system suitable for embodiments of the present application;

[0053] FIG. 4 is a schematic diagram of a flow of a signal transmission according to an embodiment of the present application;

[0054] FIG. 5 is a schematic diagram of a flow of a random access according to an embodiment of the present application;

[0055] FIG. 6 is a schematic diagram of a transmission of a beam according to an embodiment of the present application;

[0056] FIG. 7 is a schematic diagram of a structure of a synchronization signal block (SSB) (or also referred to as a synchronization signal / physical broadcast channel block (SS / PBCH block)) according to an embodiment of the present application;

[0057] FIG. 8 is a schematic diagram of a flow of a communication method for access according to an embodiment of the present application;

[0058] FIG. 9 is a schematic diagram of another flow of a signal transmission according to an embodiment of the present application;

[0059] FIG. 10 is a schematic diagram of a flow of another communication method for access according to an embodiment of the present application;

[0060] FIG. 11 is a schematic diagram of a relationship between a preconfigured bandwidth and a first RB set according to an embodiment of the present application;

[0061] FIG. 12 is a schematic diagram of another structure of an SSB according to an embodiment of the present application;

[0062] FIG. 13 is a diagram illustrating a distribution of a de-modulation reference signal (DMRS) according to an embodiment of the present application;

[0063] FIG. 14 is a diagram illustrating a terminal device according to an embodiment of the present application;

[0064] FIG. 15 is a diagram illustrating a communication method according to an embodiment of the present application;

[0065] FIG. 16 is a diagram illustrating a communication apparatus according to an embodiment of the present application;

[0066] FIG. 17 is a diagram illustrating a communication apparatus according to an embodiment of the present application;

[0067] FIG. 18 is a diagram illustrating a communication apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] In the description of the present application, unless otherwise specified, " / " means that the objects before and after the " / " are in an "or" relationship, for example, A / B can mean A or B; "and / or" in the present application is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean: A alone, A and B together, B alone, of which A and B can be singular or plural.

[0069] In the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or the like means any combination of the items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0070] In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, "first", "second" and the like are used to distinguish the same or similar items with basically the same function and role. The skilled in the art can understand that "first", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.

[0071] In the present embodiments, the word "exemplary" or "for example" is used to mean "an example of" rather than "an ideal". Any embodiment or design described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0072] It is to be understood that the terminology "including", "having" and "includes" and / or "has" and any variations thereof used herein are intended to cover a non-exclusive inclusion, such that a process, method, system, product or apparatus that comprises a list of steps or units are not necessarily limited to those explicitly stated, but can include other not expressly listed or inherent steps or units.

[0073] It is to be understood that the terminology "including", "having" and "includes" and / or "has" and any variations thereof used herein are intended to cover a non-exclusive inclusion, such that a process, method, system, product or apparatus that comprises a list of steps or units are not necessarily limited to those explicitly stated, but can include other not expressly listed or inherent steps or units.

[0074] It is to be understood that the terms "when", "if", and "while" used herein are intended to convey the meaning of "upon the occurrence of", "upon the happening of", and "upon the performance of", respectively, and not the meaning of "at the time of", "if at the time of", and "while at the time of", respectively, and are not intended to require the performance of an action at a particular time.

[0075] It is to be understood that some optional features of the present embodiments, in some scenarios, can be implemented independently of other features, such as the scheme it is based on at present, to solve the corresponding technical problems and achieve the corresponding effects, and in some scenarios, can be combined with other features according to the needs. Correspondingly, the devices given in the present embodiments can also realize these features or functions accordingly, which will not be repeated here.

[0076] It can be understood that, in this application, "indication" can include direct indication and indirect indication, and can also include explicit indication and implicit indication. When describing "a certain indication information indicates A" or "indication information of A", it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information. The information indicated by certain information is called to-be-indicated information, and there are many ways to indicate the to-be-indicated information in the specific implementation process, for example but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or the index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can be achieved by means of the arrangement order of various information agreed in advance (for example, specified by a protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common part of various information can be identified and uniformly indicated, so as to reduce the indication overhead caused by separately indicating the same information. In addition, the specific indication method can also be various existing indication methods, for example but not limited to, the above indication methods and various combinations thereof. As described above, for example, when multiple information of the same type needs to be indicated, the indication methods of different information can not be the same. In the specific implementation process, the required indication method can be selected according to the specific needs, and the selected indication method is not limited by the embodiments of the application. In this way, the indication method involved in the embodiments of the application should be understood as covering various methods that can enable the to-be-indicated party to know the to-be-indicated information. The to-be-indicated information can be sent as a whole, or can be divided into multiple sub-information and sent separately, and the sending period or sending time of the sub-information can be the same or different. The specific sending method is not limited by the application. The sending period or sending time of the sub-information can be pre-defined, for example, pre-defined according to a protocol, or configured by the transmitting end device by sending configuration information to the receiving end device.

[0077] In the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, or indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, or indirect receiving from YY through the air interface by other units or modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. In other words, sending and receiving can be carried out between devices, such as between network devices and terminal devices, or can be carried out within a device, such as between components, modules, chips, software modules or hardware modules within a device through a bus, wire or interface.

[0078] In the present application, "predefined" can mean standard protocol predefined, or can also mean pre-agreed or pre-negotiated between devices. In the present application, "protocol" can refer to standard protocols in the field of communication, which can include 5G protocol, NR protocol and related protocols applied to future communication systems, and the present application does not limit it. "Predefined" can include predefinition. For example, protocol definition. "Pre-configuration" can be realized by pre-saving corresponding codes, tables or other ways that can be used to indicate related information in the device, and the present application does not limit its implementation.

[0079] In the present application, the words such as "exemplarily" and "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is used to present the concept in a specific way. In the embodiments of the present application, "of", "corresponding" and "corresponding" can be used interchangeably at times. It should be pointed out that when there is no emphasis on their differences, the meanings they express are consistent.

[0080] In the present application, the same or similar parts of each embodiment can be mutually referred to, unless otherwise specified. In the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to, unless otherwise specified and logically conflicted. Different embodiments can be combined to form new embodiments according to their inherent logical relationship. The implementation modes of the present application described below do not constitute a limitation on the protection scope of the present application.

[0081] The technical solutions provided in the present application can be used in various communication systems, which can be a third generation partnership project (3rd generation partnership project, 3GPP) related cellular system, for example, a fourth generation (4th generation, 4G) long term evolution (long term evolution, LTE) system, an evolved LTE system (LTE-Advanced, LTE-A) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD), a universal mobile communication system (universal mobile telecommunication system, UMTS), a fifth generation (5th generation, 5G) new radio (new radio, NR) system, a vehicle to everything (vehicle to everything, V2X) system, a system of LTE and NR hybrid networking, or a device-to-device (device-to-device, D2D) system, a machine to machine (machine to machine, M2M) communication system, an internet of things (internet of things, IoT), a narrowband internet of things (narrow band-internet of things, NB-IoT), and a future communication system.

[0082] Alternatively, the communication system can also be a non-3GPP communication system, for example, an open radio access network (open radio access network, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), a wireless fidelity (wireless fidelity, WiFi) system, or a communication system fused by multiple communication systems described above, which is not limited in the present application.

[0083] Figure 1 is a schematic diagram of the architecture of a communication system to which embodiments of the present application are applied. Figure 1 shows a schematic diagram of a possible, non-limiting, architecture of a system. As shown in Figure 1, the communication system includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one RAN node (e.g. 110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal device (e.g. 120a-120j in Figure 1, collectively referred to as 120). Other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1), etc., can also be included in the RAN 100. The terminal devices 120 are connected to the RAN nodes 110 wirelessly. The RAN nodes 110 are connected to the core network 200 through wireless or wired means. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be different physical devices respectively, or can be the same physical device integrated with the logical functions of the core network and the logical functions of the radio access network.

[0084] The RAN 100 can be a 3GPP related cellular system, such as a 4G, 5G mobile communication system, or a future-oriented evolved system. The RAN 100 can also be an open radio access network (O-RAN or ORAN), a CRAN, or a wireless fidelity (Wi-Fi) system. The RAN 100 can also be a communication system that combines two or more of the above systems.

[0085] The RAN nodes 110, which can also be referred to as network devices, RAN entities, or access nodes, etc., are part of the communication system to help terminal devices to access wirelessly. The RAN nodes 110 in the communication system can be the same type of nodes or different types of nodes. In some scenarios, the roles of the RAN nodes 110 and the terminal devices 120 are relative, e.g. the network element 120i in Figure 1 can be a helicopter or a drone, which can be configured as a mobile base station. For a terminal device 120j that accesses the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal device. The RAN nodes 110 and the terminal devices 120 are sometimes collectively referred to as communication apparatuses, e.g. the network elements 110a and 110b in Figure 1 can be understood as communication apparatuses with base station functions, and the network elements 120a-120j can be understood as communication apparatuses with terminal functions.

[0086] Terminal device, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), fixed wireless access (FWA), customer premise equipment (CPE), etc. The terminal device is a device including a wireless communication function (providing voice / data connectivity to users). For example, handheld devices with wireless connection functions, vehicle-mounted devices, machine type communication (MTC) terminals, etc. At present, the terminal device can include: mobile phone, tablet computer, notebook computer, palm computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self driving (e.g. drone, vehicle), wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, or wireless terminal in smart home, etc. For example, the wireless terminal in self driving can be a drone, helicopter, or airplane, etc. For example, the wireless terminal in Internet of Vehicles can be a vehicle-mounted device, whole vehicle device, vehicle-mounted module, vehicle, or ship, etc. The wireless terminal in industrial control can be a camera, robot, or mechanical arm, etc. The wireless terminal in smart home can be a television, air conditioner, sweeping machine, sound box, or set-top box, etc. The terminal device can also be a device or module with corresponding communication function accessing the above-mentioned communication system. The terminal device is usually provided with a communication module, circuit or chip for executing corresponding communication functions, and is also configured with program instructions for executing corresponding communication functions.

[0087] It should be noted that the terminal device can be a device or apparatus with a chip, or a device or apparatus integrated with a circuit, or a chip, chip system, module or control unit in the above-mentioned devices or apparatus, which is not limited in the present application. It should be noted that in the present application, when referring to the terminal device, it can refer to the terminal device itself, or the chip, functional module or integrated circuit in the terminal device that completes the method provided in the present application, which is not limited in the present application.

[0088] The RAN is a device deployed in a wireless access network to provide wireless communication functions for terminal devices. The RAN can also be referred to as a RAN entity, an access node, a network node, a network device, or a communication apparatus, etc.

[0089] Specifically, the RAN can be a network device of a 3GPP related cellular system. For example, a 4G mobile communication system, a 5G mobile communication system, or a future communication system. The RAN can also be a network device in an open access network (open RAN, O-RAN or ORAN) or a cloud radio access network (CRAN). Alternatively, the RAN can also be a network device in a communication system obtained by fusing two or more of the above communication systems.

[0090] The RAN includes, but is not limited to, an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, home evolved NodeB, or home NodeB, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WiFi) system, a macro base station, a micro base station, a wireless relay node, a donor node, a radio controller in a CRAN scenario, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP) in a future communication network, a TRP, a TP, or one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G mobile communication system. Or, the RAN can also be a network device in a 5G mobile communication system. For example, a future communication network, a TRP, a TP, or one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G mobile communication system. Or, the RAN can also be a network node constituting a gNB or a transmission point. For example, a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately provided, or can be included in the same network element. For example, a BBU. The RU can be included in a radio frequency device or a radio frequency unit. For example, in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). Or, the RAN can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, in a V2X technology, the RAN can be a road side unit (RSU).

[0091] It should be noted that in different systems, the CU (or centralized unit-control plane (CU-CP) and centralized unit-user plane (CU-UP)), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (O-RAN or ORAN) system, the CU can also be referred to as an open centralized unit (O-CU) or an open CU, the DU can also be referred to as an open distributed unit (O-DU), the CU-CP can also be referred to as an open centralized unit-control plane (O-CU-CP) or an open CU-CP, the CU-UP can also be referred to as an open centralized unit-user plane (O-CU-UP) or an open CU-UP, and the RU can also be referred to as an open radio unit (O-RU). The specific application is not limited. Any one of the CU, CU-CP, CU-UP, DU and RU in the present application can be realized by a software module, a hardware module, or a combination of a software module and a hardware module.

[0092] As shown in (a) of FIG. 2, the ORAN system includes a core network, a network device and a UE. Optionally, the ORAN system can also include other components in addition to the components shown in (a) of FIG. 2, and the specific application is not limited.

[0093] The network device can communicate with the core network (CN) through a backhaul (BH) link. The network device can communicate with the UE through an air interface. Specifically, the BBU in the network device communicates with the core network through the backhaul link. The RU in the network device communicates with at least one UE through the air interface. The BBU communicates with at least one RU through a fronthaul link, and the BBU and the RU can be co-located or not co-located. The BBU includes at least one CU and at least one DU, and the CU and the DU can communicate through at least one midhaul link.

[0094] In a possible implementation, as shown in (b) of FIG. 2, the CU is a logical node carrying radio resource control (RRC), a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, and other control functions of the network device. The CU can be connected to network nodes such as a core network through some interfaces. For example, an E2 interface. Optionally, the CU can have part of the functions of the core network. The CU (for example, the PDCP layer and / or higher layer of the CU) is connected to the DU (for example, the radio link control (RLC) layer and lower layer of the DU) through some interfaces. For example, an F1 interface. Optionally, the F1 interface can provide control plane (C-Plane) and user plane (U-Plane) functions (for example, interface management, system information management, UE context management, RRC message transmission, and the like). F1AP is an application protocol of the F1 interface, which defines signaling procedures of the F1 in some examples. The F1 interface supports control plane F1-C and user plane F1-U.

[0095] Optionally, as shown in (b) of FIG. 2, the CU can be split into a CU-CP and a CU-UP, wherein the CU-CP is a logical node carrying the control plane part of PDCP (PDCP-C) layer of the RRC layer and the packet data convergence protocol layer, used to implement the control plane function of the CU. The CU-CP can interact with a network element in the core network for implementing the control plane function. The network element in the core network for implementing the control plane function can be an access and mobility function network element, such as an access and mobility management (AMF) in a 5G system. The AMF network element is used to be responsible for the mobility management in the mobile network, such as the location update of the terminal device, the registration network of the terminal device, the handover of the terminal device, etc. The CU-UP is a logical node carrying the user plane part of PDCP (PDCP-U) layer of the SDAP layer and the packet data convergence protocol layer, used to implement the user plane function of the CU. The CU-UP can interact with a network element in the core network for implementing the user plane function. The network element in the core network for implementing the user plane function, for example, a user plane function (UPF) in a 5G system, is used to be responsible for the forwarding and receiving of data in the terminal device. The above configuration of the CU and the DU is only an example, and in actual application, the CU and the DU can also be configured to have functions according to needs. For example, the CU or the DU can be configured to have more functions of the protocol layer, or the CU or the DU can be configured to have part of the processing function of the protocol layer. For example, part of the function of the RLC layer and the function of the protocol layer above the RLC layer are set in the CU, and the remaining function of the RLC layer and the function of the protocol layer below the RLC layer are set in the DU. For another example, the function of the CU or the DU can be divided according to the service type or other system requirements, for example, according to the delay, the function that needs to meet the delay requirement of the processing time is set in the DU, and the function that does not need to meet the delay requirement is set in the CU.

[0096] In a possible implementation, as shown in (b) of FIG. 2, the DU is a logical node carrying an RLC layer, a medium access control (MAC) layer, a higher physical layer (Higher PHY), and other functions. In some examples, the DU can control at least one RU. The DU is connected with the RU through some interfaces, which can be a front-haul interface. In some examples, the Higher PHY includes parts of physical (PHY) layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, and the like.

[0097] In a possible implementation, as shown in (b) of FIG. 2, the RU is a logical node carrying a lower physical layer (Lower PHY) and radio frequency (RF) processing. In some examples, the RU can be a 3GPP transmission reception point (TRP) or a remote radio head (RRH) or other similar functional entity. In some examples, the Lower-PHY includes parts of PHY processing, such as fast fourier transform (FFT), inverse fast fourier transformation (IFFT), digital beamforming and filtering, and the like. The RU communicates with one or more UEs through a wireless link.

[0098] The DU and the RU can or can not be co-located. The DU and the RU exchange control plane information and user plane information via a lower-layer split-CUS-plane (LLS-CUS) interface over a fronthaul link. The LLS-CUS can include a lower-layer split control (LLS-C) interface and a lower-layer split user (LLS-U) interface that provide control plane (C-Plane) and user plane (U-Plane), respectively. In some examples, the control plane (C-Plane) refers to real-time control between the DU and the RU. The DU and the RU have a lower-layer split management (LLS-M) interface of the fronthaul link to exchange management information, and the management plane (M-Plane) refers to non-real-time management operations between the DU and the RU. In addition, the LLS-M interface can also interact with a management system to exchange information.

[0099] The DU and the RU can cooperate to jointly implement the functions of the PHY layer. One DU can be connected to one or more RUs. The functions of the DU and the RU can be configured in multiple ways according to design. For example, the DU is configured to implement baseband functions, and the RU is configured to implement mid- radio functions. For another example, the DU is configured to implement high-layer functions in the PHY layer, and the RU is configured to implement low-layer functions in the PHY layer or to implement the low-layer functions and radio functions. The high-layer functions in the PHY layer can include a portion of the functions of the PHY layer that are closer to the MAC layer, and the low-layer functions in the PHY layer can include another portion of the functions of the PHY layer that are closer to the mid-radio side.

[0100] In different systems, the CU (or CU-CP and CU-UP), the DU, or the RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, the CU-CP, the CU-UP, the DU, and the RU are taken as examples for description in this application.

[0101] It should be noted that the network device can be a device or apparatus with a chip, or a device or apparatus integrated with a circuit, or a chip, a chip system, a module or a control unit in the above-mentioned device or apparatus, and the specific application is not limited. It should be noted that in this application, when referring to the network device, it can refer to the network device itself, or the chip, functional module or integrated circuit in the network device that completes the method provided in the application, and the specific application is not limited.

[0102] Referring to FIG. 3, it is a structural schematic diagram of a communication network element between a terminal device and a network device in the embodiment of the present application. The terminal device 10 includes a processor 101, a memory 102 and a transceiver 103, and the transceiver 103 includes a transmitter 1031, a receiver 1032 and an antenna 1033. The network device 20 includes a processor 201, a memory 202 and a transceiver 203, and the transceiver 203 includes a transmitter 2031, a receiver 2032 and an antenna 2033. The receiver 1032 can be used to receive transmission control information through the antenna 1033, and the transmitter 1031 can be used to send transmission feedback information to the network device 20 through the antenna 1033. The transmitter 2031 can be used to send transmission control information to the terminal device 10 through the antenna 2033, and the receiver 2032 can be used to receive transmission feedback information sent by the terminal device 10 through the antenna 2033. The memory 102 and the memory 202 store computer program codes.

[0103] In order to facilitate the understanding of the technical solutions of the embodiments of the present application, first, a brief introduction of the related technologies of the present application is as follows.

[0104] 1. Signal transmission:

[0105] The signal transmission in the communication system can include the flow as shown in FIG. 4: the sending end device can generate information a with a length of A bits by inputting a signal source into a load generation module; then, the information a is scrambled to obtain information a' with a length of A bits; then, the information a' is cyclic redundancy check (CRC) encoded to generate information b with a length of A+L bits; wherein, the information b is obtained by adding a CRC sequence with a length of L to the information a'. Then, the information b is channel encoded to generate information c with a length of N bits; then, the information c is rate matched to generate information d with a length of E bits; then, the information d is scrambled again to obtain information d' with a length of E bits; then, the information d' is modulated to generate information e with a length of H bits; further, the information e is resource mapped and outputted.

[0106] Correspondingly, the receiving end device can receive information from the channel, and sequentially perform de-modulation reference signal (DMRS), channel estimation, and channel equalization on the information to obtain information g with a length of H bits; then perform de-modulation on the information g to generate information i with a length of E bits; then perform secondary descrambling on the information i to obtain information i' with a length of E bits; then perform de-rate matching on the information i' to obtain information k with a length of N bits; then perform channel decoding on the information k to generate information Then perform CRC check on the information to obtain information with a length of A bits Then perform de-modulation on the information to obtain information with a length of A bits

[0107] Exemplarily, the channel coding scheme (or channel coding type) mainly includes: block code, convolutional code (such as tail biting convolutional coding (TBCC)), turbo code (or simply referred to as Turbo code), low density parity check (LDPC) code, and polar code (or simply referred to as Polar code), etc.

[0108] Exemplarily, modulation refers to a process of processing information and adding it to a carrier to make it suitable for channel transmission. Correspondingly, demodulation is the inverse process of modulation; demodulation can also be referred to as detection.

[0109] Among them, different modes correspond to different modulation methods. For example, the modulation method can include one or more of the following: multicarrier modulation, single-carrier modulation, quadrature amplitude modulation (QAM), pulse amplitude modulation (PAM), phase shift keying (PSK) modulation, amplitude shift keying (ASK) modulation.

[0110] 2. Reference signal (RS):

[0111] Reference signals are also called pilot signals. In a communication system, it is necessary to transmit and receive data, acquire system synchronization and feedback channel information, estimate uplink or downlink channels. Channel estimation refers to the process of reconstructing or recovering received signals to compensate for signal distortion caused by channel fading and noise. It uses reference signals known by the transmitter and receiver to track the time and frequency domain changes of the channel. The reference signals are also called reference signals, which are distributed in different resource elements (REs) in the time-frequency two-dimensional space within the orthogonal frequency division multiplexing (OFDM) symbol, and have known amplitude and phase.

[0112] At the physical layer, uplink communication can include transmission of uplink physical channels and uplink signals (or also referred to as uplink reference signals). The uplink physical channels include random access channels (PRACH), physical uplink control channels (PUCCH), physical uplink shared channels (PUSCH), etc., and the uplink signals include sounding reference signals (SRS), physical uplink control channel-demodulation reference signals (PUCCH-DMRS), physical uplink shared channel-demodulation reference signals (PUSCH-DMRS), phase tracking reference signals (PTRS), uplink positioning reference signals (UL-PRS), etc.

[0113] At the physical layer, the downlink communication can include transmission of downlink physical channels and downlink signals (or, also referred to as downlink reference signals). Among them, the downlink physical channels include a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), etc., and the downlink signals include a primary synchronization signal (PSS) / secondary synchronization signal (SSS), a physical downlink control channel de-modulation reference signal (PDCCH-DMRS), a physical downlink shared channel de-modulation reference signal (PDSCH-DMRS), a phase tracking reference signal (PTRS), a channel state information reference signal (CSI-RS), a cell reference signal (CRS), a time / frequency tracking reference signal (TRS), a positioning reference signal (PRS), etc.

[0114] It should be understood that the reference signals listed above are only examples and should not constitute any limitation on the present application. The present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0115] 3. Access in NR:

[0116] In NR, after the terminal device (such as user equipment (user equipment, UE)) is powered on or needs to re-access the network, it needs to scan the synchronization signal / physical broadcast channel block (synchronization signal / physical broadcast channel block, SSB) from the network device (such as a base station), and perform downlink time and frequency synchronization. This process is called cell search. Further, after determining that the SSB is received, the SIB carried by the system information block (system information blocks, SIB) indicated by the SSB can be received based on the resource, and then the random access configuration information indicated by the SIB can be initiated to initiate random access, so as to realize the terminal device to access the network.

[0117] For example, as shown in FIG. 5, the initial access process of the terminal device can include the steps S501-S503 shown in FIG. 5 as follows:

[0118] S501, the network device sends the SSB; correspondingly, the terminal device receives the SSB from the network device.

[0119] For example, the content carried on the physical broadcast channel block (physical broadcast channel block, PBCH) included in the SSB is called the master system information block (master information block, MIB). Among them, the MIB can indicate the main information such as the search space (searchSpaceZero) and the control resource set (controlResourceSetZero) of the SIB.

[0120] Specifically, the SSB used to indicate SIB1 can also be called: define SSB (cell defining SSB, CD SSB) (protocol term: CORESET for Type0-PDCCH CSS is present; wherein CORESET is control resource set; PDCCH is physical downlink control channel; CSS is common search space). In addition, the SSB that does not indicate SIB1 can also be called non-cell defining SSB (non-cell defining SSB, NCD SSB) (protocol term: CORESET for Type0-PDCCH CSS set is not present).

[0121] Exemplarily, the network device can broadcast the SSB in a broadcast manner, and further, the network device can periodically broadcast the SSB. The terminal device can be a terminal device located in a signal coverage range of the network device, so as to be able to receive the SSB broadcast by the network device.

[0122] S502, the network device sends the SIB, and correspondingly, the terminal device receives the SIB from the network device.

[0123] Exemplarily, the network device can broadcast the SIB in a broadcast manner.

[0124] Exemplarily, the SIB can include SIB1, and further, the SIB can also include SIB2, SIB4, PDCCH space search (searchSpace1), etc. Wherein, the SIB1 is used to carry the configuration information of random access.

[0125] S503, the terminal device initiates random access (RA) based on the configuration information of random access.

[0126] Exemplarily, the terminal device can select the random access resource associated with the SSB received by the terminal device in the configuration information of random access. Wherein, the random access resource includes time domain resource, frequency domain resource, and code domain resource (such as random access preamble). Further, the random access signal, also known as message 1 (Msg1) / message A (Msg A), is sent based on the random access resource. That is, the terminal device can initiate random access based on the random access resource.

[0127] Exemplarily, the purpose of random access is to enable the terminal device to access the network and obtain uplink synchronization. Specifically, the random access process can be divided into four-step random access (4-step RA) and two-step random access (4-step random access, 2-step RA). Specifically, the random access process can refer to the related description of the current NR random access process, which will not be repeated here.

[0128] 4, SSB:

[0129] The network device (e.g., a base station) can periodically transmit SSBs. One SSB period includes one SSB burst set, and the relative positions of the SSB burst set in each SSB period are the same. Therefore, the SSB period can also be understood as the period of the SSB burst set. One SSB burst set includes multiple SSBs. Each SSB has an index. In one SSB period, the indexes of different SSBs are different. As shown in (a) of FIG. 6, the length of one SSB period is denoted as T SSB The first SSB period includes one SSB burst set, as shown by the thick square box in the first period in (a) of FIG. 6. The SSB burst set includes K SSBs, and the indexes of the K SSBs are denoted as SSB#0, SSB#1, …, and SSB#K-1, respectively, where K is a positive integer and K≥2. In the second SSB period, one SSB burst set is also included, as shown by the thick square box in the second period in (a) of FIG. 6. The SSB burst set is the same as the SSB burst set included in the first period, and the relative positions of the SSBs with the same indexes in different SSB burst sets are the same.

[0130] Generally, the length of the SSB period is fixed; for example, the length of the SSB period can be 20 milliseconds (ms), unless the network device changes its own transmission configuration. In addition, the SSB period can also be referred to as the period of the SSB, or can also be referred to as the period. The embodiments of the present application are not limited thereto. In the embodiments of the present application, the SSB period is taken as an example for description, and the following is uniformly described. The subsequent description is not repeated.

[0131] For the network device, the network device transmits the SSBs using spatial domain transmission parameters (i.e., beams used for transmitting signals, or also referred to as transmission beams). Specifically, the network device can use different spatial domain transmission parameters to transmit different SSBs in the same period. For example, taking the SSBs in the first period in (a) of FIG. 6 as an example, the network device can use spatial domain transmission parameter #0 (or also referred to as beam #0, or also referred to as transmission beam #0) to transmit SSB #0; similarly, the network device can use spatial domain transmission parameter #1 (or also referred to as beam #1) to transmit SSB #1, …, and use spatial domain transmission parameter #K-1 (or also referred to as beam #K-1) to transmit SSB #K-1. Wherein the beam directions corresponding to spatial domain transmission parameter #0, spatial domain transmission parameter #1, …, and spatial domain transmission parameter #K-1 can be different, so that the network device covers terminal devices in different beam directions. When K = 8, it can also be considered that the network device uses beam #0 to transmit SSB #0, uses beam #1 to transmit SSB #1, …, and uses beam #7 to transmit SSB #7. For SSBs in adjacent periods, such as the K SSBs in the second period in (a) of FIG. 6, the network device can still continue the transmission manner in the first period, i.e., uses spatial domain transmission parameter #0 to transmit SSB #0; uses spatial domain transmission parameter #1 to transmit SSB #1, …, and uses spatial domain transmission parameter #K-1 to transmit SSB #K-1. That is, the network device can use the same spatial domain parameter to transmit SSBs with the same index in different periods. Or, each SSB index corresponds to a spatial domain transmission parameter.

[0132] As shown in (b) of FIG. 6, when K = 8, in a certain period, if terminal device #1 and terminal device #2 can both receive SSBs from the network device, based on the positions of terminal device #1 and terminal device #2, the signal strengths of the received SSBs carried on different beams are different. As shown in (b) of FIG. 6, the signal of the SSB carried on beam #1 received by terminal device #1 is the strongest, and the signal of the SSB carried on beam #7 received by terminal device #2 is the strongest.

[0133] For a terminal device, the terminal device can receive and detect an SSB, if a reference signal received power (RSRP) of a certain SSB is greater than an RSRP threshold, and after the terminal device successfully demodulates and decodes, the terminal device can first determine an index of the SSB, that is, which SSB in a period is the SSB. Then, the terminal device determines configuration information of the terminal device for initiating random access according to the SSB, that is, a random access channel (RACH) opportunity (RO). The RO is a time-frequency resource used for transmitting an uplink access signal in a random access process, and belongs to an uplink resource.

[0134] Specifically, the association between the SSB index and the RO enables the network device to use the corresponding spatial domain receiving parameter (that is, a beam for receiving a signal, or also referred to as a receiving beam) to aim at the terminal device when the terminal device initiates an uplink access signal on the RO. For example, the network device transmits an SSB with an index of SSB#0 in the direction of beam#0. When a terminal device is in the direction of beam#0, the terminal device can receive the SSB with the index of SSB#0. The terminal device can measure the RSRP of the SSB, and after the RSRP of the SSB meets a certain condition, the terminal device can initiate an uplink access signal (such as Msg1) on the RO associated with the index SSB#0. The network device can use beam#0 to receive on the RO associated with SSB#0, so as to ensure that the signal power or energy of the received uplink access signal is relatively high, and improve the success rate of random access of the terminal device.

[0135] The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH. As shown in (a) of FIG. 7, in the time domain, the SSB occupies 4 OFDM symbols; the first OFDM symbol is used to carry the PSS, the second OFDM symbol and the fourth OFDM symbol are used to carry the PBCH, and the third OFDM symbol is used to carry the SSS signal and part of the PBCH. In the frequency domain, the SSB occupies 240 subcarriers.

[0136] Specifically, the PSS occupies 1 OFDM symbol in the time domain, the 1 OFDM symbol being the first OFDM symbol of the 4 OFDM symbols, for example, the 1 OFDM symbol can be OFDM symbol #0; the PSS occupies 127 subcarriers in the frequency domain. The SSS occupies 1 OFDM symbol in the time domain, the 1 OFDM symbol being the third OFDM symbol of the 4 OFDM symbols, for example, the 1 OFDM symbol can be OFDM symbol #2; the SSS occupies 127 subcarriers in the frequency domain. Wherein, the 127 subcarriers occupied by the PSS and the 127 subcarriers occupied by the SSS are the 57th-183rd subcarriers of the 240 subcarriers occupied by the SSB, for example, the 127 subcarriers can be subcarrier #56-subcarrier #182.

[0137] The PBCH occupies 3 OFDM symbols in the time domain, the 3 OFDM symbols being the 1st-4th OFDM symbols of the 4 OFDM symbols, for example, the 3 OFDM symbols are OFDM symbol #1-OFDM symbol #3. Wherein, for the PBCH on OFDM #1 and OFDM symbol #3, it occupies 240 subcarriers in the frequency domain, for example, the 240 subcarriers can be subcarrier #0-subcarrier #239; and subcarrier #0, subcarrier #4, subcarrier #8, …, subcarrier #236 in the subcarrier #0-subcarrier #239 carry DMRS. For the PBCH on OFDM #2, it occupies 96 subcarriers in the frequency domain, for example, the 96 subcarriers can be subcarrier #0-subcarrier #47, subcarrier #192-subcarrier #239. And subcarrier #0, subcarrier #4, subcarrier #8, …, subcarrier #44 in the subcarrier #0-subcarrier #47 carry DMRS. Subcarrier #192, subcarrier #196, subcarrier #200, …, subcarrier #236 in the subcarrier #192-subcarrier #239 carry DMRS. In addition to the above, the remaining subcarriers can be set to 0. That is, the time-frequency resources occupied by the SSB can include the contents shown in Table 1:

[0138] Table 1

[0139] Since one resource element (RE) occupies 1 subcarrier in the frequency domain, a resource block (RB) includes 12 consecutive subcarriers in the frequency domain, taking RE as a basic unit; therefore, the 240 subcarriers occupied by the SSB in the frequency domain can correspond to 20 RBs; the bandwidth occupied by the SSB includes 20 RBs. At this time, the time-frequency resource occupied by the SSB can be as shown in (b) of FIG. 7. The following takes 20 RBs included in the bandwidth occupied by the SSB as RB#0-RB#19 as an example for introduction.

[0140] The PSS and the SSS both occupy 12 RBs (that is, RB#4-RB15); of which, 12 REs (that is, RE#0-RE#11) in RB#4 and RB#15 can be divided into two parts, of which, RE#0-RE#5 are used to carry the PSS or the SSS, and RE#6-RE#11 can be set to 0. In addition, the 12 RBs occupied by the PSS occupy OFDM symbol #0 in the time domain, and the 12 RBs occupied by the PSS occupy OFDM symbol #2 in the time domain.

[0141] The PBCH occupies 3 OFDM symbols in the time domain, which are the 1st-4th OFDM symbols, for example, the 3 OFDM symbols are OFDM symbol #1-OFDM symbol #3. For the PBCH carried on OFDM #1 and OFDM symbol #3, it occupies 20 RBs (that is, RB#0-RB#19). For the PBCH carried on OFDM #2, it occupies 8 RBs, that is, RB#0-RB#3 and RB#17-RB#19. Of which, for the RB used to carry the PBCH, 12 REs in each RB can be divided into two parts, RE#0-RE#2, RB#4-RB#6, and RB#8-RB#10 are used to carry the DMRS, and RE#3, RE#7, RE#11 are used to carry the PBCH.

[0142] When the frequency is 30 mega hertz (MHz), the bandwidth corresponding to 20 RBs is 7.2 MHz; that is, when the bandwidth of the terminal device is greater than or equal to 7.2 MHz, the complete PBCH in the SSB can be received, and then access can be implemented based on the SIB indicated by the PBCH.

[0143] However, for a terminal device with a bandwidth less than 7.2 MHz, such as a terminal device with a bandwidth of 5 MHz (which corresponds to 13 RBs), or a small bandwidth terminal device (such as a reduced capability (RedCap) terminal device), the terminal device cannot receive a complete PBCH and thus cannot access the network. Therefore, a new SSB mapping scheme needs to be redesigned.

[0144] Based on this, the embodiments of the present application provide a communication device and apparatus for access, and a terminal device can receive a PBCH from a network device. The PBCH carries valid information (i.e., first information, which is a rate-matched coded bit output by channel coding, and the first information indicates a time-frequency resource for carrying random access information) and redundant information (second information, which is a redundant part obtained by redundant coding of the first information). The total number of resource elements (REs) occupied by the valid information and the redundant information is X times the number of REs occupied by the valid information, and X is a positive integer greater than 1.

[0145] That is, the number of REs occupied by the valid information is less than the number of REs occupied by the redundant information. Therefore, even if the terminal device cannot receive a complete PBCH, as long as the valid information is received, the time-frequency resource for carrying random access information can be obtained, and the random access information can be received on the time-frequency resource for carrying random access information, and the random access can be initiated based on the random access information, so that the terminal device accesses the network.

[0146] In other words, for a small bandwidth terminal device (such as a terminal device with a bandwidth containing a number of REs less than the total number of resource elements (REs) occupied by the valid information and the redundant information), the terminal device can access the network as long as the valid information is received. Therefore, the network device can set appropriate time-frequency resources for the valid information, so that the valid information mapped on the time-frequency resources can be successfully received by the small bandwidth terminal device, thereby enabling the small bandwidth terminal device to access the network.

[0147] The embodiments provided by the present application will be described in detail below with reference to the accompanying drawings. The embodiments provided by the present application can be applied to the communication system shown in FIG. 1, without limitation.

[0148] In the following embodiments, the terminal side communication device is taken as an example of a terminal device, and the network side communication device is taken as an example of a network device, to exemplarily illustrate the interaction between the terminal side communication device and the network side communication device. The terminal device can be replaced by a component (such as a chip or a chip system or a circuit) of the terminal device, and the network device can be replaced by a component (such as a chip or a chip system or a circuit) of the network device.

[0149] Referring to FIG. 8, FIG. 8 is a flow diagram of a communication method for accessing according to an embodiment of the present application. The method shown in FIG. 8 can include the following steps S801-S802.

[0150] S801, the network device sends a PBCH to the terminal device; correspondingly, the terminal device receives the PBCH from the network device.

[0151] The PBCH is used to carry first information and second information. The first information is obtained by rate matching the coded bits output by channel coding, and the first information indicates time-frequency resources for carrying random access information. The second information is a redundant part obtained by redundancy coding the first information. The total number of REs occupied by the first information and the second information is X times the number of REs occupied by the first information, where X is a positive integer greater than 1.

[0152] For example, the first information is obtained by rate matching the coded bits output by channel coding. It can be understood that the network device can sequentially perform payload generation, scrambling, CRC encoding, channel coding, and rate matching on the original data, and the output information is the first information.

[0153] Specifically, the implementation of payload generation, scrambling, CRC encoding, channel coding, and rate matching can refer to the introduction of the related parameters in FIG. 4 described above, and will not be described here.

[0154] It can be understood that the information output after channel coding and rate matching has a length of E. In the current 3GPP protocol, the value of E is usually 864 bits. However, in the present application, the length of the information output by rate matching can be set to E' bits, where E' = E / X. That is, the length of the first information is E' bits.

[0155] For example, the second information is a redundant part obtained by redundancy coding the first information, which can also be understood as: the second information is the redundant information in the information obtained by redundancy coding the first information. That is, the information output by redundancy coding includes valid information and redundant information. The second information is the redundant information, and the first information is the valid information. For example, the total number of REs occupied by the first information and the second information is X times the number of REs occupied by the first information, which can also be understood as: the total length of the first information and the second information is X times the length of the first information. Since the length of the first information is E', the total length of the first information and the second information is E' * X = E bits.

[0156] That is, in this application, the length of the information output by rate matching (i.e., the first information) is currently 1 / X of the length of the information output by rate matching in the 3GPP protocol. Further, the first information can be subjected to redundancy coding to obtain a redundant part in the information. The information output by redundancy coding is the PBCH. That is, the information output by redundancy coding includes the first information and the second information. For example, the first information can be located before the second information. For example, the information output by rate matching (i.e., the first information) is f0, f1, f2, …, f E′-1 For example, the information output after redundancy coding is f0, f1, f2, …, f E′*X-1 , the first information is f0, f1, f2, …, f E′-1 , and the second information is f E′ , f E′+1 , f E′+2 , …, f E′*X-1 .

[0157] For example, the value of X can be previously agreed between the network device and the terminal device. For example, the network device can determine and inform the terminal device; or the network device can determine and inform the terminal device; or the value of X can be predefined by a protocol. For example, the value of X can be 2; or the value of X can also be any other possible value, such as 3, 4, etc., which is not limited in this application.

[0158] Optionally, secondary scrambling can also be performed before redundancy coding; that is, at this time, the second information is the redundant part of the first information obtained by redundancy coding, which can be replaced by: the second information is the redundant part of the information obtained by secondary scrambling and redundancy coding of the first information.

[0159] Specifically, under this optional scheme, the signal transmission process can be as shown in FIG. 9, that is, the original data is subjected to load generation, secondary scrambling, CRC coding, channel coding, and rate matching in sequence, and the information output after rate matching is the first information; further, the first information can be subjected to secondary scrambling and redundancy coding in sequence, and the information output after rate matching includes the first information and the second information.

[0160] For example, the information output by rate matching (i.e., the first information) is f0, f1, f2, …, f E′-1 For example, the information output after secondary scrambling is f'0, f'1, f'2, …, f' E′-1 , and further, the information obtained after redundancy coding is f'0, f'1, f'2, …, f' E′*X-1 ; wherein the first information is f'0, f'1, f'2, …, f' E′-1 , and the second information is f' E′ , f' E′+1f', f E′+2 f', f E′*X-1 .

[0161] Specifically, the implementation of the payload generation, the sequential scrambling, the CRC encoding, the channel encoding, the rate matching, and the secondary scrambling can refer to the introduction of the related parameters in FIG. 4, and will not be described here again.

[0162] It should be noted that the redundancy encoding in the present application can also be referred to as other names, such as redundancy increase, sequence increase, etc., which are not limited in the present application. For the convenience of description, the redundancy encoding is taken as an example for description below, and the unified description will not be described again.

[0163] For example, the PBCH is used to carry the first information and the second information, which can be understood as that the function of the PBCH is to carry the first information and the second information; however, the PBCH received by the terminal device may not necessarily carry the first information and the second information. For example, whether the PBCH received by the terminal device carries the first information and the second information can be determined according to the size relationship between the bandwidth of the terminal device and the bandwidth occupied by the PBCH (i.e., the bandwidth occupied by the first information and the second information, such as the preconfigured bandwidth).

[0164] For example, when the bandwidth of the terminal device is greater than or equal to the bandwidth occupied by the PBCH, the terminal device can receive the PBCH carrying the first information and the second information. That is, at this time, the PBCH carries the first information and the second information. When the bandwidth of the terminal device is less than the bandwidth occupied by the PBCH, the terminal device can only receive the PBCH carrying the first information. That is, at this time, the PBCH only carries the first information.

[0165] For example, the PBCH is used to carry the first information and the second information, which can also be understood as that the first information and the second information can be carried on the PBCH. That is, after the redundancy encoding outputs the first information and the second information, the first information and the second information can be carried on the PBCH and transmitted.

[0166] Specifically, after the redundancy encoding outputs the first information and the second information, the network device can perform resource mapping on the first information and the second information, so that the first information and the second information are carried on the PBCH, and then the PBCH is transmitted. Alternatively, after the redundancy encoding outputs the first information and the second information, as shown in FIG. 9, the network device can sequentially perform modulation and resource mapping on the first information and the second information, so that the first information and the second information are carried on the PBCH, and then the PBCH is transmitted.

[0167] Specifically, the ratio relationship between the valid part (i.e., the information output after the first information is modulated) and the redundant part (i.e., the information output after the second information is modulated) in the information output after the first information and the second information are modulated is the same as the ratio relationship between the first information and the second information. For example, taking the length of the information output after the first information and the second information are modulated as M bits, the information length of the valid part is M / X bits. For example, the information output after the first information and the second information are modulated is q0, q1, q2, …, qM-1. M-1 , wherein the first information can be q0, q1, q2, …, qM-1. X-1 , the second information can be qM, qM+1, qM+2, …, q2M-1. X , qM+1, qM+2, …, q2M-1. X+1 , qM+1, qM+2, …, q2M-1. X+2 , qM+1, qM+2, …, q2M-1. M-1 .

[0168] Based on the above description of "the PBCH carrying the first information and the second information", it can be understood that the network device sends the PBCH to the terminal device, which means that the network device generates the load, scrambles, CRC encodes, channel encodes, rate matches, twice scrambles, and redundancy encodes the original data in sequence to output the first information and the second information, and performs resource mapping on the first information and the second information so that they are carried in the PBCH, and further sends the PBCH.

[0169] Alternatively, the network device sends the PBCH to the terminal device, which can also be understood as: the network device generates the load, scrambles, CRC encodes, channel encodes, rate matches, twice scrambles, and redundancy encodes the original data in sequence to output the first information and the second information, and modulates and performs resource mapping on the first information and the second information in sequence so that they are carried in the PBCH, and further sends the PBCH.

[0170] Optionally, the network device sends the PBCH to the terminal device, which includes that the network device sends the SSB to the terminal device, and correspondingly, the terminal device receives the SSB from the network device. The SSB includes the PBCH.

[0171] Illustratively, the network device can send the SSB in a broadcast or unicast manner, and / or the network device can periodically send the SSB.

[0172] Specifically, the implementation of the network device periodically sending the SSB can be referred to the related description of (a) in FIG. 6 above, which will not be described here.

[0173] It should be understood that the first information and the second information are carried in the PBCH in the present application, and in fact, the first information and the second information can also be carried in other information, which is not limited in the present application; as long as the total length of the first information and the second information is X times the information length of the first information.

[0174] S802, the network device sends random access information to the terminal device; correspondingly, the terminal device receives the random access information from the network device according to the PBCH.

[0175] Optionally, since the first information indicates the time-frequency resource of the random access information, the terminal device receives the random access information from the network device according to the PBCH, which can also be understood as that the terminal device receives the random access information on the time-frequency resource.

[0176] Exemplarily, the random access information can include information for carrying configuration information of random access. It can be understood that the configuration information of random access is usually carried in SIB (such as SIB1); therefore, the random access information can be SIB. That is, the above step S802 can be replaced by: the network device sends SIB to the terminal device; correspondingly, the terminal device receives the SIB from the network device according to the PBCH.

[0177] Specifically, the implementation of SIB and the configuration information of random access can be referred to the related description in the above FIG. 5, which will not be repeated here.

[0178] Optionally, after step S802, as shown in FIG. 10, the communication method for access further includes step S803:

[0179] S803, the terminal device initiates RA based on the random access information.

[0180] The implementation of step S803 is the same as the implementation of the above step S503, and the specific implementation can be referred to the related description of the above step S503, which will not be repeated here.

[0181] The embodiment of the present application provides a communication method for access, and the terminal device can receive the PBCH from the network device; the PBCH carries valid information (i.e. the first information, the first information is the coded bits output by channel coding after rate matching, and the first information indicates the time-frequency resource for carrying random access information) and redundant information (the second information, the second information is the redundant part obtained by redundant coding of the first information). The total number of resource elements (RE) occupied by the valid information and the redundant information is X times the number of RE occupied by the valid information, and X is a positive integer greater than 1.

[0182] That is, the number of REs occupied by the valid information is less than the number of REs occupied by the redundant information; therefore, even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, the time-frequency resource used to carry the random access information can be acquired, so that the random access information is received on the time-frequency resource used to carry the random access information, and the random access is initiated based on the random access information, so that the terminal device accesses the network. In other words, for a terminal device with a small bandwidth (such as a terminal device whose bandwidth contains a number of REs less than the total number of resource elements REs occupied by the valid information and the redundant information), the terminal device can access the network as long as the valid information is received; therefore, the network device can set appropriate time-frequency resources for the valid information, so that the valid information mapped on the time-frequency resources can be successfully received by the terminal device with a small bandwidth, so that the terminal device with a small bandwidth accesses the network.

[0183] The above is a general description of the scheme provided by the embodiments of the present application. The "first information" involved in the above embodiments will be described in detail below. Specifically, the mapping manner of the first information can be described in detail.

[0184] Optionally, the first information is carried in a first RB set. The number of RBs in the first RB set is less than the number of RBs of the preconfigured bandwidth.

[0185] Exemplarily, when the network device does not perform modulation operation after redundancy encoding, but directly performs resource mapping on the first information, the first information is carried in the first RB set. It can be understood that the network device performs resource mapping on the first information, and maps the first information in the first RB set.

[0186] When the network device performs modulation and resource mapping operations in sequence after redundancy encoding, the first information is carried in the first RB set. It can be understood that the network device modulates the first information, and performs resource mapping on the information obtained after modulation, and carries the information in the first RB set.

[0187] For convenience of description, the information related to the first information (such as the first information or the information obtained after modulation of the first information) input by the resource mapping module will be collectively referred to as PBCH#P in the following description. The unified description will not be repeated here. That is, the PBCH#P is carried in the first RB set.

[0188] Exemplarily, the preconfigured bandwidth refers to the bandwidth configured for sending a synchronization resource block; wherein the preconfigured bandwidth is greater than or equal to the bandwidth occupied by the information carried (or carried) on the PBCH.

[0189] In addition, when the network device transmits the PBCH through other information, such as the other information indicating (or including) the PBCH; the preconfigured bandwidth can also be understood as a bandwidth configured for transmitting the other information. At this time, the preconfigured bandwidth is greater than or equal to the bandwidth occupied by the other information. For example, the other information can be an SSB; at this time, the preconfigured bandwidth can also be understood as a bandwidth configured for transmitting the SSB. At this time, the preconfigured bandwidth is greater than or equal to the bandwidth occupied by the SSB.

[0190] It can be understood that the bandwidth occupied by the SSB and the number of RBs contained in the bandwidth occupied by the PBCH are usually the same, so when the other information is the SSB, the preconfigured bandwidth refers to the bandwidth configured for transmitting the PBCH; or in other words, the preconfigured bandwidth refers to the bandwidth configured for transmitting the SSB.

[0191] For the convenience of description, the following is to take the preconfigured bandwidth equal to the bandwidth occupied by the information carried (or borne) on the PBCH. In this unified description, no further description is given. At this time, the number of RBs contained in the preconfigured bandwidth is greater than the number of RBs in the first RB set, in other words, the number of RBs in the first RB set is less than the number of RBs contained in the preconfigured bandwidth. That is, the first RB set includes part of the RBs in the preconfigured bandwidth.

[0192] Optionally, the first RB set includes a plurality of consecutive RBs. That is, the PBCH#P is mapped on a plurality of consecutive RBs.

[0193] Optionally, the maximum index of the RB in the first RB set is less than the maximum index of the RB in the preconfigured bandwidth, and / or the minimum index of the RB in the first RB set is greater than the minimum index of the RB in the preconfigured bandwidth.

[0194] Exemplarily, the first RB set can include a plurality of consecutive RBs with smaller RB indexes among the RBs contained in the preconfigured bandwidth; as shown in (a) of FIG. 11, the minimum index of the RB in the first RB set can be equal to the minimum index of the RB in the preconfigured bandwidth; since the number of RBs in the first RB set is less than the number of RBs contained in the preconfigured bandwidth, at this time, the first RB set also satisfies that the maximum index of the RB in the first RB set is less than the maximum index of the RB in the preconfigured bandwidth. Specifically, taking the preconfigured bandwidth including 20 RBs (i.e., RB#0-RB#19) and the first RB set including 10 RBs as an example, at this time, the first RB set can include RB#0-RB#9.

[0195] Alternatively, the first RB set can include a plurality of consecutive RBs with larger RB indexes in the 20 RBs included in the pre-configured bandwidth; as shown in (b) of FIG. 11, the largest index of the RBs in the first RB set can be equal to the largest index of the RBs in the pre-configured bandwidth; since the number of the RBs in the first RB set is less than the number of the RBs included in the pre-configured bandwidth, at this time, the first RB set also satisfies: the smallest index of the RBs in the first RB set is larger than the smallest index of the RBs in the pre-configured bandwidth. Specifically, taking the pre-configured bandwidth including 20 RBs (i.e., RB#0-RB#19) and the first RB set including 10 RBs as an example, at this time, the first RB set can include RB#10-RB#19.

[0196] Alternatively, the first RB set can include a plurality of consecutive RBs with indexes of the RBs in the 20 RBs included in the pre-configured bandwidth; as shown in (c) of FIG. 11, the smallest index of the RBs in the first RB set can be larger than the smallest index of the RBs in the pre-configured bandwidth, and the largest index of the RBs in the first RB set can be smaller than the largest index of the RBs in the pre-configured bandwidth. Specifically, taking the pre-configured bandwidth including 20 RBs (i.e., RB#0-RB#19) and the first RB set including 10 RBs as an example, at this time, the first RB set can include RB#6-RB#14.

[0197] Based on the relationship among the RB, the RE, and the subcarrier, it can be known that the first RB set includes a plurality of REs, and further, the first RB set includes a plurality of subcarriers in the frequency domain. For example, the plurality of subcarriers can be any plurality of subcarriers in the pre-configured bandwidth. Alternatively, the plurality of subcarriers can be determined based on the subcarrier set (or the RB set) for carrying the PSS and / or the subcarrier set (or the RB set) for carrying the SSS.

[0198] Specifically, when the network device transmits the PBCH through the SSB (or when the network device transmits the PBCH#P through the SSB), the PSS and the SSS are also carried on the pre-configured bandwidth, so that the index of the plurality of subcarriers included in the first RB set can be determined based on the subcarrier set (or the RB set) for carrying the PSS and / or the subcarrier set (or the RB set) for carrying the SSS. Among them, based on the above, it can be known that the subcarrier set for carrying the PSS and the SSS both include subcarrier#56-subcarrier#182.

[0199] Optionally, the plurality of subcarriers included in the first RB set overlap or do not overlap with subcarrier#56-subcarrier#182.

[0200] (1) If there is no overlap between the plurality of subcarriers included in the first RB set and the subcarrier set used to carry the PSS or the SSS:

[0201] As an example, the smallest index of the plurality of subcarriers included in the first RB set is greater than the largest index in the subcarrier set used to carry the PSS (and / or the subcarrier set used to carry the SSS), and the largest index of the plurality of subcarriers included in the first RB set can be less than or equal to the largest index of the subcarriers in the SSB occupied bandwidth.

[0202] As an example, since the SSB occupied bandwidth includes subcarrier #0 to subcarrier #239, when there is no overlap between the plurality of subcarriers included in the first RB set and subcarrier #56 to subcarrier #182, the smallest index of the plurality of subcarriers included in the first RB set can be greater than 182, and the largest index of the plurality of subcarriers included in the first RB set can be less than or equal to 239. For example, the plurality of subcarriers included in the first RB set can include subcarrier #201 to subcarrier #230, or the plurality of subcarriers included in the first RB set can include subcarrier #192 to subcarrier #239.

[0203] As another example, the largest index of the plurality of subcarriers included in the first RB set is less than the smallest index in the subcarrier set used to carry the PSS (and / or the subcarrier set used to carry the SSS), and the smallest index of the plurality of subcarriers included in the first RB set can be greater than or equal to the smallest index of the subcarriers in the SSB occupied bandwidth.

[0204] As an example, the smallest index of the plurality of subcarriers included in the first RB set can be greater than or equal to 0, and the largest index of the plurality of subcarriers included in the first RB set can be less than 56. For example, the plurality of subcarriers included in the first RB set can include subcarrier #0 to subcarrier #55, or the plurality of subcarriers included in the first RB set can include subcarrier #5 to subcarrier #44.

[0205] (2) If there is overlap between the plurality of subcarriers included in the first RB set and the subcarrier set used to carry the PSS or the SSS:

[0206] As an example, the smallest index of the plurality of subcarriers included in the first RB set is less than or equal to the largest index in the subcarrier set used to carry the PSS (and / or the subcarrier set used to carry the SSS), and the largest index of the plurality of subcarriers included in the first RB set can be less than or equal to the largest index of the subcarriers in the SSB occupied bandwidth.

[0207] For example, the maximum index of the plurality of subcarriers included in the first RB set can be less than or equal to 182, and the minimum index of the plurality of subcarriers included in the first RB set can be greater than or equal to 0. For example, the plurality of subcarriers included in the first RB set can include subcarrier #0 ~ subcarrier #182, or the plurality of subcarriers included in the first RB set can include subcarrier #0 ~ subcarrier #172, or the plurality of subcarriers included in the first RB set can include subcarrier #5 ~ subcarrier #172.

[0208] As another example, the maximum index of the plurality of subcarriers included in the first RB set can be less than or equal to the minimum index of the subcarrier set used to carry the PSS (and / or the subcarrier set used to carry the SSS), and the minimum index of the plurality of subcarriers included in the first RB set can be greater than or equal to the minimum index of the subcarriers in the SSB occupied bandwidth.

[0209] For example, the maximum index of the plurality of subcarriers included in the first RB set can be less than or equal to 182, and the minimum index of the plurality of subcarriers included in the first RB set can be greater than or equal to 56. For example, the plurality of subcarriers included in the first RB set can include subcarrier #56 ~ subcarrier #182, or the plurality of subcarriers included in the first RB set can include subcarrier #56 ~ subcarrier #172, or the plurality of subcarriers included in the first RB set can include subcarrier #78 ~ subcarrier #182.

[0210] As another example, the maximum index of the plurality of subcarriers included in the first RB set can be less than or equal to the minimum index of the subcarrier set used to carry the PSS (and / or the subcarrier set used to carry the SSS), and the minimum index of the plurality of subcarriers included in the first RB set can be greater than or equal to the minimum index of the subcarriers in the SSB occupied bandwidth.

[0211] For example, the maximum index of the plurality of subcarriers included in the first RB set can be less than or equal to 182, and the minimum index of the plurality of subcarriers included in the first RB set can be greater than or equal to 56. For example, the plurality of subcarriers included in the first RB set can include subcarrier #56 ~ subcarrier #182, or the plurality of subcarriers included in the first RB set can include subcarrier #56 ~ subcarrier #172, or the plurality of subcarriers included in the first RB set can include subcarrier #78 ~ subcarrier #182.

[0212] It should be understood that the above description of the first RB set including a plurality of subcarriers in the frequency domain is only an example of a possible implementation of the frequency domain resource of the PBCH#P, and does not mean that the frequency domain resource of the PBCH#P only includes the implementation in the above example. In fact, the frequency domain resource of the PBCH#P can also include other possible implementations in addition to the above examples, which are not limited by the present application.

[0213] For example, the time domain resource of the PBCH#P is not limited in the present application, i.e., the PBCH#P can be carried in one or more time units; wherein when the PBCH#P is carried in a plurality of time units, the plurality of time units can be consecutive time units or non-consecutive time units. The present application is not limited.

[0214] Specifically, the time unit can include but is not limited to: radio frame, subframe, slot, mini slot, sub slot, symbol, time window composed of a plurality of frames or subframes. The time window composed of a plurality of frames or subframes can be, for example, a system information (SI) window.

[0215] Optionally, when the network device transmits the PBCH through the SSB (or when the network device transmits the PBCH#P through the SSB), the time unit for carrying the PBCH#P can be one or more of the OFDM symbols #0-#3 in the 4 OFDM symbols occupied by the SSB.

[0216] For example, the time unit for carrying the PBCH#P can be OFDM symbol #1 and / or OFDM symbol #3, and the plurality of subcarriers included in the first RB set can be any of the plurality of subcarriers #0-#239. Alternatively, the time unit for carrying the PBCH#P can be OFDM symbol #0 and / or OFDM symbol #2, and the plurality of subcarriers included in the first RB set can not overlap with the plurality of subcarriers #56-#182.

[0217] The above is a description of the "first information", and the "second information" involved in the above embodiments will be described in detail below. Specifically, the mapping manner of the second information can be described in detail.

[0218] Optionally, the second information is carried in the second RB set. The second RB set does not overlap with the first RB set.

[0219] For example, when the network device does not perform modulation operation after the redundancy coding, but directly performs resource mapping on the second information, the second information is carried in the second RB set. It can be understood that the network device performs resource mapping on the second information, and maps the second information in the second RB set.

[0220] When the network device performs modulation and resource mapping operations in sequence after the redundancy coding, the second information is carried in the second RB set. It can be understood that the network device modulates the second information, and performs resource mapping on the information obtained after modulation, and carries the information in the second RB set.

[0221] For convenience of description, the information related to the second information (such as the second information or the information obtained after modulation of the second information) input by the resource mapping module will be collectively referred to as PBCH#S in the following description. The unified description will not be repeated here. That is, the PBCH#S is carried in the second RB set.

[0222] For example, the total number of RBs included in the first RB set and the second RB set is less than or equal to the number of RBs included in the preconfigured bandwidth. Specifically, the implementation of the preconfigured bandwidth can refer to the related description of the above embodiments, which will not be repeated here.

[0223] For convenience of description, the preconfigured bandwidth is equal to the bandwidth occupied by the information carried (or carried) on the PBCH in the following description. In other words, the number of RBs included in the preconfigured bandwidth is equal to the number of RBs occupied by the PBCH#S and the PBCH#. That is, the total number of RBs included in the first RB set and the second RB set is equal to the number of RBs included in the preconfigured bandwidth. The unified description will not be repeated here.

[0224] At this time, the number of RBs in the second RB set is less than the number of RBs included in the preconfigured bandwidth. That is, the second RB set includes part of the RBs in the preconfigured bandwidth.

[0225] For example, the second RB set can be implemented based on the following two scenarios:

[0226] Scenario one, the multiple RBs included in the second RB set can be consecutive RBs.

[0227] As an example, the maximum index of the RB in the first RB set can be less than the minimum index of the RB in the second RB set,

[0228] For example, the minimum index of the RBs in the first RB set can be greater than or equal to the minimum index of the RBs in the preconfigured bandwidth, and the maximum index of the RBs in the second RB set can be less than or equal to the maximum index of the RBs in the preconfigured bandwidth. For example, the preconfigured bandwidth includes 20 RBs (i.e., RB#0-RB#19); at this time, the first RB set can include RB#0-RB#8, and the second RB set can include RB#10-RB#19; or the first RB set can include RB#2-RB#9, and the second RB set can include RB#10-RB#17.

[0229] For another example, the minimum index of the RBs in the first RB set can be greater than the maximum index of the RBs in the second RB set.

[0230] For example, the minimum index of the RBs in the first RB set can be greater than or equal to the minimum index of the RBs in the preconfigured bandwidth, and the maximum index of the RBs in the second RB set can be less than or equal to the maximum index of the RBs in the preconfigured bandwidth. For example, the preconfigured bandwidth includes 20 RBs (i.e., RB#0-RB#19); at this time, the first RB set can include RB#0-RB#8, and the second RB set can include RB#10-RB#19; or the first RB set can include RB#2-RB#9, and the second RB set can include RB#10-RB#17.

[0231] In combination with the above two examples, optionally, the number of RBs included in the first RB set can be greater than the number of RBs included in the second RB set; or the number of RBs included in the first RB set can be less than the number of RBs included in the second RB set; or the number of RBs included in the first RB set can be equal to the number of RBs included in the second RB set.

[0232] For example, the first RB set includes RB#0-RB#3, and the second RB set includes RB#4-RB#6; or the first RB set includes RB#0-RB#3, and the second RB set includes RB#4-RB#8; or the first RB set includes RB#0-RB#3, and the second RB set includes RB#5-RB#6.

[0233] Optionally, the second RB set includes a plurality of subcarriers in the frequency domain. For example, the plurality of subcarriers included in the second RB set can be part or all of the remaining subcarriers in the subcarriers used to carry the PBCH in the SSB, except for the plurality of subcarriers included in the first RB set.

[0234] For example, the first RB set includes a plurality of subcarriers from subcarrier #56 to subcarrier #182; at this time, the second RB set can include part or all of subcarriers from subcarrier #183 to subcarrier #239; or the second RB set can include part or all of subcarriers from subcarrier #0 to subcarrier #55.

[0235] For example, the first RB set includes a plurality of subcarriers from subcarrier #56 to subcarrier #182; at this time, the second RB set can include part or all of subcarriers from subcarrier #183 to subcarrier #239; or the second RB set can include part or all of subcarriers from subcarrier #0 to subcarrier #55.

[0236] For example, when the second RB set includes part or all of subcarriers in the remaining subcarriers in the SSB used to carry the PBCH except the plurality of subcarriers included in the first RB set, the time unit used to carry the PBCH#S can be one or more of OFDM symbol #1, OFDM symbol #2, or OFDM symbol #3 in the 4 OFDM symbols occupied by the SSB.

[0237] Scenario two, the plurality of RBs included in the second RB set can be non-continuous RBs.

[0238] Optionally, the second RB set includes a first RB subset and a second RB subset.

[0239] In the first RB subset, the maximum index of the RBs is less than the minimum index in the first RB set, and the minimum index of the RBs in the first RB subset is greater than or equal to the minimum index of the RBs in the preconfigured bandwidth; and / or, in the second RB subset, the minimum index of the RBs is greater than the maximum index in the first RB set, and the maximum index of the RBs in the second RB subset is less than or equal to the maximum index of the RBs in the preconfigured bandwidth.

[0240] That is, in the first RB subset and the second RB subset, the RB indexes in one of the RB subsets are all greater than the maximum index in the first RB set, and the RB indexes in the other RB subset are all less than the maximum index in the first RB set; that is, the first RB set includes a plurality of continuous RBs with intermediate index values in the preconfigured bandwidth; and the second RB set includes a plurality of RBs located at both ends in the preconfigured bandwidth.

[0241] For example, the preconfigured bandwidth includes 20 RBs (i.e., RB#0-RB#19), and the first RB set includes RB#4-RB#14; at this time, the first RB subset can include RB#15-RB#19, and the second RB subset can include RB#0-RB#3; or the first RB set can include RB#17-RB#19, and the second RB set can include RB#0-RB#2. Or, the first RB subset can include RB#0-RB#3, and the second RB subset can include RB#15-RB#19; or the first RB set can include RB#0-RB#2, and the second RB set can include RB#16-RB#19.

[0242] Optionally, the first RB set can include more RBs than the second RB set; or the first RB set can include less RBs than the second RB set; or the first RB set can include the same number of RBs as the second RB set.

[0243] For example, the first RB set includes RB#6-RB#12, and the second RB set includes RB#4-RB#5 and RB#13-RB#14; or the first RB set includes RB#6-RB#12, and the second RB set includes RB#4 and RB#13; or the first RB set includes RB#6-RB#12, and the second RB set includes RB#2-RB#5 and RB#13-RB#15.

[0244] Optionally, the first RB subset can include more RBs than the second RB subset; or the first RB subset can include less RBs than the second RB subset; or the first RB subset can include the same number of RBs as the second RB subset.

[0245] For example, the first RB subset includes 3 RBs, and the second RB subset can include 3 RBs; or the second RB subset can include 4 RBs; or the second RB subset can include 2 RBs.

[0246] Optionally, the first RB subset and the second RB subset respectively include a plurality of subcarriers in the frequency domain.

[0247] For example, when a network device transmits PBCH via SSB (or, when a network device transmits PBCH#P and PBCH#S via SSB), the subcarriers occupied by PBCH#S (i.e., the multiple subcarriers included in the first RB subset and the second RB subset) can be some or all of the remaining subcarriers among the 240 subcarriers occupied by the SSB that are used to carry PBCH, excluding the multiple subcarriers included in the first RB subset. For example, this application does not limit the time-domain resources of PBCH#S; that is, PBCH#S can be carried in one or more time units. When PBCH#S is carried in multiple time units, these multiple time units can be consecutive or non-consecutive time units. This application does not impose any restrictions.

[0248] For example, when the multiple subcarriers included in the second RB set can be some or all of the remaining subcarriers in the SSB used to carry PBCH, excluding the multiple subcarriers included in the first RB set, the time unit used to carry PBCH#S can be one or more of OFDM symbol #1, OFDM symbol #2, or OFDM symbol #3 out of the four OFDM symbols occupied by the SSB.

[0249] Taking the time unit used to carry PBCH#P (i.e., the time unit of PBCH#P, or in other words, the time unit included in the first RB set in the time domain) as an example, where OFDM symbol #1 and OFDM symbol #3 are among the four OFDM symbols occupied by the SSB, and the subcarriers included in the first RB set in the frequency domain are subcarriers #56 to #182, then the time unit used to carry PBCH#S (i.e., the time unit of PBCH#S, or in other words, the time unit included in the second RB set in the time domain) can include one or more of OFDM symbols #1 to #3. Wherein, if the time unit used to carry PBCH#S includes OFDM symbol #1 and / or OFDM symbol #3, then the subcarriers occupied by PBCH#S can be any subcarrier among the 240 subcarriers occupied by the SSB, excluding the multiple subcarriers included in the first RB set. If the time unit used to carry PBCH#S includes OFDM symbol #2, then the subcarrier occupied by PBCH#S can be any subcarrier among the 240 subcarriers, excluding the multiple subcarriers included in the first RB set and the subcarriers occupied by SSS.

[0250] Specifically, as shown in FIG. 12, the time domain resource of the PBCH#P is the OFDM symbol #1 and the OFDM symbol #3 of the 4 OFDM symbols occupied by the SSB, the frequency domain resource of the PBCH#P is the continuous multiple subcarriers in the middle of the subcarriers #0 to the subcarriers #239, the time domain resource of the PBCH#S is the OFDM symbol #1 to the OFDM symbol #3 of the 4 OFDM symbols occupied by the SSB, and the frequency domain resource of the PBCH#P is the multiple subcarriers at both ends of the subcarriers #0 to the subcarriers #239. At this time, the time-frequency resources of the PBCH#P and the PBCH#S can include the contents shown in the following Table 2.

[0251] Table 2

[0252] As shown in Table 2, that is, the subcarriers included in the first RB set (that is, the frequency domain resource of the PBCH#P) can include the subcarriers #56 to the subcarriers #182. The subcarriers included in the second RB set (the frequency domain resource of the PBCH#S) can include the subcarriers #0 to the subcarriers #55 and the subcarriers #183 to the subcarriers #239. Among them, the subcarriers included in the first RB subset can include the subcarriers #0 to the subcarriers #55; correspondingly, the subcarriers included in the second RB subset can include the subcarriers #183 to the subcarriers #239. Alternatively, the subcarriers included in the first RB subset can include the subcarriers #183 to the subcarriers #239; correspondingly, the subcarriers included in the second RB subset can include the subcarriers #0 to the subcarriers #55.

[0253] At this time, the PSS, the SSS, and the PBCH#P all occupy 12 RBs. When the frequency is 30MHz, the bandwidth corresponding to 12 RBs is 4.3MHz; that is, when the subcarrier spacing (SCS) = 30kHz, the terminal device with a bandwidth of 4.3MHz can receive the first information carried by the PBCH, and then receive the random access information based on the time-frequency resource of the random access information indicated by the first information in the PBCH, and then initiate random access according to the random access information, so as to access the network.

[0254] In combination with the above two scenarios, optionally, any RB in the first RB set and the second RB set includes a first RE set and a second RE set. Among them, the first RE set in the first RB set is used to carry the first information, the first RE set in the second RB set is used to carry the second information, and the second RE set is used to carry the reference signal.

[0255] Optionally, the frequency domain position of the second RE set is related to the cell identifier (Cell ID) of the network device. That is, the position of the DMRS is related to the Cell ID, and the starting position of the DMRS is Among them, Cell ID (Identifier or Identity).

[0256] Specifically, since one RB includes 12 REs; therefore, the first RE set and the second RE set together include 12 REs. Exemplarily, taking the 12 REs included in one RB as RE#0-RE#11 for example, as shown in (a) of FIG. 13, the second RE set can include RE#0, RE#4, RE#8; at this time, the first RE set includes RE#1-RE#3, RE#5-RE#7, RE#9-RE#11. Alternatively, as shown in (b) of FIG. 13, the second RE set can include RE#1, RE#5, RE#9; at this time, the first RE set includes RE#1, RE#2-RE#4, RE#6-RE#8, RE#10-RE#11. Alternatively, as shown in (c) of FIG. 13, the second RE set can include RE#2, RE#6, RE#10; at this time, the first RE set includes RE#0-RE#1, RE#3-RE#5, RE#11. Alternatively, as shown in (d) of FIG. 13, the second RE set can include RE#3, RE#7, RE#11; at this time, the first RE set includes RE#0-RE#2, RE#4-RE#6, RE#8-RE#10.

[0257] The implementation of the terminal device receiving the PBCH involved in the above embodiment is described in detail below. Exemplarily, based on different implementations of the terminal device, the terminal device can receive the PBCH in the following two ways:

[0258] One possibility is that in the implementation, if the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the PBCH received by the terminal device carries information related to the first information and the second information; therefore, the terminal device needs to perform redundant decoding in the process of receiving the PBCH, and eliminate the second information, so as to obtain the first information.

[0259] Optionally, the terminal device receives the PBCH from the network device, including: the terminal receives a synchronization signal (such as SSB) from the network device; wherein the synchronization signal includes the PBCH, and the PBCH carries the first information and the second information. At this time, the communication method for access further includes: the terminal device performs channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information; and further performs redundant decoding on the first information and the second information to obtain the first information.

[0260] Exemplarily, in a possible implementation, the receiving procedure of the signal can be as shown in FIG. 9, that is, after the terminal device receives the synchronization signal, the terminal device performs DMRS detection, channel estimation, and channel equalization on the synchronization signal in sequence to obtain the first information and the second information; wherein, if modulation is also performed at the encoding end (that is, the network device), after the channel equalization, the terminal device also needs to demodulate the output information to obtain the first information and the second information. Further, the terminal device can perform redundant decoding on the first information and the second information, and eliminate the second information to obtain the first information. Optionally, the terminal device can also perform secondary descrambling, rate dematching, channel decoding, CRC checking, and primary descrambling on the first information in sequence to obtain the data in the first information.

[0261] Exemplarily, in the channel estimation process, the terminal device can extract the pilot DMRS in the PBCH (that is, PBCH#S and PBCH#P) according to the resource mapping position of the PBCH#S and the PBCH#P to complete the pilot and data channel coefficient estimation.

[0262] Specifically, the implementation of the DMRS detection, the channel estimation, the channel equalization, the demodulation, the secondary descrambling, the rate dematching, the channel decoding, the CRC checking, and the primary descrambling can refer to the related description of FIG. 4, and will not be described here again.

[0263] Exemplarily, in this possible implementation, since the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the process of the terminal device accessing the network can also be referred to as frequency domain access or frequency domain fast access. For example, as shown in FIG. 14, in the process of the frequency domain access (or frequency domain fast access), the terminal device can receive all the information (that is, PSS, SSS, PBCH#P, and PBCH#S) on the preconfigured bandwidth. The implementation of the PSS, the SSS, the PBCH#P, and the PBCH#S in FIG. 14 can refer to the related description in FIG. 12, and will not be described here again.

[0264] In another possible implementation, if the bandwidth of the terminal device is less than the preconfigured bandwidth, the PBCH received by the terminal device can only carry information related to the first information, so that the terminal device does not need to perform redundant decoding in the process of receiving the PBCH, and the decoding procedure in FIG. 4 can be used to obtain the first information.

[0265] Exemplarily, based on the foregoing, only the PBCH#P in the PBCH#S and the PBCH#P carried by the PBCH is valid information; therefore, a suitable resource mapping position can be set for the PBCH#P to enable the terminal device to receive the PBCH#P.

[0266] For convenience of description, the resource mapping position of the PBCH#P is taken as an example and described uniformly below according to the table 2, and will not be described here again.

[0267] Optionally, the terminal device receives the PBCH from the network device, including: the terminal receives a synchronization signal (such as SSB) from the network device; wherein the synchronization signal includes the PBCH, and the PBCH carries the first information. At this time, the communication method for access further includes: the terminal device performs channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0268] Exemplarily, in a possible implementation, the signal receiving process can be as shown in FIG. 4, that is, after the terminal device receives the synchronization signal, the terminal device performs DMRS detection, channel estimation, and channel equalization on the synchronization signal in sequence to obtain the first information; wherein if modulation is also performed at the encoding end (that is, the network device), demodulation needs to be performed on the output information after channel equalization to obtain the first information. Optionally, the terminal device can further perform secondary descrambling, rate dematching, channel decoding, CRC checking, and primary descrambling on the first information in sequence to obtain the data in the first information.

[0269] Exemplarily, in the channel estimation process, since the bandwidth of the terminal device is smaller than the preconfigured bandwidth, the terminal device cannot receive the complete PBCH, but receives PBCH#P. At this time, the terminal device can extract the pilot DMRS in PBCH#P according to the resource mapping position of PBCH#P, and complete the pilot and data channel coefficient estimation.

[0270] Specifically, the implementation of DMRS detection, channel estimation, channel equalization, demodulation, secondary descrambling, rate dematching, channel decoding, CRC checking, and primary descrambling can refer to the related description of FIG. 4 above, and will not be described here again.

[0271] Exemplarily, for a terminal device with a smaller bandwidth (such as a terminal device with a bandwidth smaller than the preconfigured bandwidth), the demodulation performance of the terminal device (such as a RedCap terminal device) is also relatively weak in general. Therefore, in this possible implementation, the terminal device can not parse PBCH#P by receiving SSB only once, therefore, the terminal device can receive multiple periods of SSBs and parse the multiple SSBs to obtain PBCH#P, thereby improving the demodulation performance of SSB. At this time, the process of the terminal device accessing the network can also be referred to as time domain access or narrowband time domain access. For example, as shown in FIG. 14, in the process of time domain access (or narrowband time domain access), the terminal device can receive part of the information on the preconfigured bandwidth, such as PSS, SSS, and PBCH#P. Wherein, the implementation of PSS, SSS, PBCH#P, and PBCH#S in FIG. 14 can refer to the related introduction in FIG. 12 above, and will not be described here again.

[0272] In the above embodiment, a possible implementation of the communication method for access provided in the present application is provided. Another possible implementation of the communication method for access provided in the present application is described in detail as follows.

[0273] Referring to FIG. 15, a flowchart of another communication method for access provided in an embodiment of the present application is shown in FIG. 15. The method can include steps S1501-S1503.

[0274] S1501, the network device sends a synchronization signal to the terminal device; correspondingly, the terminal device can receive the synchronization signal from the network device.

[0275] The synchronization signal includes a PBCH. The PBCH is used to carry first information and second information. The first information is obtained by rate matching the coded bits output by channel coding. The first information indicates time-frequency resources for carrying random access information. The second information is a redundant part of the first information obtained by redundancy coding. The total number of REs occupied by the first information and the second information is X times the number of REs occupied by the first information. X is a positive integer greater than 1.

[0276] The synchronization signal can be an SSB. The implementation of the synchronization signal (e.g., SSB) and the PBCH (e.g., the first information and the second information carried by the PBCH) can be referred to the related description of the above embodiment, which is not described herein again.

[0277] S1502, the terminal device processes the synchronization signal according to the size relationship between the bandwidth of the terminal device and the preconfigured bandwidth to obtain the first information.

[0278] In a possible implementation, if the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the synchronization information received by the terminal device carries information related to the first information and the second information. That is, when the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the PBCH received by the terminal device carries the first information and the second information. Therefore, the terminal device needs to perform redundancy decoding after receiving the synchronization information to remove the second information, thereby obtaining the first information.

[0279] Optionally, the processing of the synchronization signal by the terminal device to obtain the first information includes: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information; and performing redundancy decoding on the first information and the second information to obtain the first information.

[0280] In a possible implementation, the receiving process of the signal can be as shown in FIG. 14. The implementation of the terminal device obtaining the first information can be referred to the related description of FIG. 14, which is not described herein again.

[0281] In another possible implementation, if the bandwidth of the terminal device is smaller than the preconfigured bandwidth, the synchronization signal received by the terminal device can only carry information related to the first information, that is, when the bandwidth of the terminal device is smaller than the preconfigured bandwidth, the PBCH received by the terminal device only carries the first information. Thus, the terminal device does not need to perform redundant decoding after receiving the synchronization signal, and can obtain the first information by using the decoding process in FIG. 4.

[0282] Optionally, the terminal device processes the synchronization signal to obtain the first information, including: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0283] For example, in a possible implementation, the receiving process of the signal can be as shown in FIG. 4, that is, the terminal device can obtain the first information by referring to the related description of FIG. 4, which is not repeated here.

[0284] S1503. The terminal device receives random access information according to the first information.

[0285] The implementation of step S1503 is similar to the implementation of step S802, and details can be referred to the related description of step S802, which is not repeated here.

[0286] The embodiment of the present application provides a communication method for access. After receiving the synchronization signal from the network device, the terminal device can determine whether the terminal device has received complete PBCH according to the size relationship between the bandwidth receiving capability of the terminal device and the preconfigured bandwidth. The terminal device can process the synchronization signal by selecting a suitable processing mode according to the determination result, so as to obtain the first information. Since the first information indicates the time-frequency resource for carrying random access information, the terminal device can receive the random access information on the time-frequency resource for carrying the random access information, and initiate random access based on the random access information, so that the terminal device accesses the network. That is, the terminal device with different bandwidths can access the network in the present application.

[0287] For example, when the bandwidth of the terminal device is less than the preconfigured bandwidth, it indicates that the terminal device cannot receive the redundancy information carried by the PBCH, but the first information carried by the PBCH is valid information (i.e., the PBCH carries the first information (the first information is the coded bits output by channel coding after rate matching) and the second information (the second information is the redundancy part of the first information obtained by redundancy coding; wherein the total number of resource elements (REs) occupied by the first information and the second information is X times the number of REs occupied by the valid information, and X is a positive integer greater than 1)), so even if the terminal device cannot receive the complete PBCH, as long as the valid information is received, that is, the time-frequency resource used to carry the random access information can be obtained, the random access information can be received based on the time-frequency resource used to carry the random access information, and the random access can be initiated based on the random access information, so that the terminal device accesses the network.

[0288] When the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, it indicates that the terminal device can receive the complete PBCH (i.e., the valid information and the redundancy information carried by the PBCH), so the second information obtained by redundancy coding is also carried in the PBCH, and therefore the PBCH needs to be subjected to inverse redundancy coding (i.e., redundancy decoding) during the receiving process to remove the second information, thereby obtaining the first information; and the terminal device further accesses the network.

[0289] It should be noted that the implementation of each parameter (such as the first RB set, the second RB set, the first RB subset, the second RB subset, the first RE set, and the second RE set) in the above embodiments is exemplary and only represents some possible implementations, and does not mean that the parameters only include the implementations in the above embodiments. In fact, the parameters can also be any other possible implementation other than the examples in the above embodiments, and the present application does not limit this.

[0290] In addition, the "number" and "index" in the above embodiments represent the same meaning, that is, the number and the index can be replaced with each other; or there can be other names such as serial numbers, and the present application does not limit this.

[0291] It should be noted that each embodiment of the present application can be independently implemented or combined for implementation, and is not limited. If there is no special description and no logical conflict, the terms and / or descriptions provided in different embodiments of the present application are consistent with each other and can be mutually referenced. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0292] The above describes the scheme provided by the embodiments of the present application mainly from the perspective of interaction between devices. It can be understood that, in order to implement the above functions, each device comprises a hardware structure and / or software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0293] It can be understood that, in order to implement the above functions, the communication apparatus comprises a hardware structure and / or software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0294] The embodiments of the present application can divide the functional modules of each device according to the above method examples, for example, each functional module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or software functional module. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical functional division. There can be another division manner when actually implemented.

[0295] FIG. 16 shows a structural schematic diagram of a communication apparatus 1600. The communication apparatus 1600 comprises a processing module 1601 and a transceiver module 1602. The communication apparatus can be used to implement the functions of the terminal side communication apparatus (such as the terminal device described in the above FIGS. 8-15) or the network side communication apparatus (such as the network device described in the above FIGS. 8-15).

[0296] In some embodiments, the communication apparatus 1600 can further comprise a storage module (not shown in FIG. 16) for storing programs, instructions and / or data.

[0297] In some embodiments, the transceiver module 1602, which can also be referred to as a transceiver unit, is used to implement the sending and / or receiving functions. The transceiver module 1602 can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.

[0298] In some embodiments, the transceiver module 1602 can include a receiving module and / or a transmitting module for performing the receiving and transmitting type steps, respectively, performed by the terminal-side communication apparatus (e.g., the terminal device described above with reference to FIGS. 8-15) or the network-side communication apparatus (e.g., the network device described above with reference to FIGS. 8-15) in the method embodiments described above, and / or for supporting other processes for the techniques described herein; and the processing module 1601 can be configured to perform the processing type (e.g., determining, etc.) steps performed by the terminal-side communication apparatus (e.g., the terminal device described above with reference to FIGS. 8-15) or the network-side communication apparatus (e.g., the network device described above with reference to FIGS. 8-15) in the method embodiments described above, and / or for supporting other processes for the techniques described herein.

[0299] When the communication apparatus 1600 is configured to implement the functions of the terminal-side communication apparatus (e.g., the terminal device), then:

[0300] In some embodiments, the transceiver module 1602 is configured to receive a PBCH, the PBCH carrying first information and second information, the first information being rate matched from channel coded output, the first information indicating time-frequency resources for carrying random access information, the second information being a redundancy portion of the first information obtained by redundancy coding, a total number of resource elements (REs) occupied by the first information and the second information being X times a number of REs occupied by the first information, X being a positive integer greater than 1; and the transceiver module 1602 is further configured to receive the random access information based on the PBCH.

[0301] Optionally, the first information is carried in a first RB set, a number of RBs in the first RB set being less than a number of RBs in the preconfigured bandwidth.

[0302] Optionally, a maximum index of RBs in the first RB set is less than a maximum index of RBs in the preconfigured bandwidth, and / or a minimum index of RBs in the first RB set is greater than a minimum index of RBs in the preconfigured bandwidth.

[0303] Optionally, the second information is carried in a second RB set, the second RB set not overlapping the first RB set, the first RB set being used to carry the first information.

[0304] Optionally, the second RB set includes a first RB subset and a second RB subset; a maximum index of RBs in the first RB subset is less than a minimum index in the first RB set, and a minimum index of RBs in the first RB subset is greater than or equal to a minimum index of RBs in the preconfigured bandwidth; and / or a minimum index of RBs in the second RB subset is greater than a maximum index in the first RB set, and a maximum index of RBs in the second RB subset is less than or equal to a maximum index of RBs in the preconfigured bandwidth.

[0305] Optionally, each of the first RB set and the second RB set includes a first RE set and a second RE set; the first RE set in the first RB set is used to carry the first information, the first RE set in the second RB set is used to carry the second information, and the second RE set is used to carry a reference signal.

[0306] Optionally, the transceiver 1602 is further configured to receive the PBCH from the network device, and the frequency domain position of the second RE set is related to a cell identity corresponding to the network device.

[0307] Optionally, when the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the transceiver 1602 is further configured to receive the synchronization signal, and the processing module 1601 is configured to perform channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information, and perform redundancy decoding on the first information and the second information to obtain the first information.

[0308] Optionally, when the bandwidth of the terminal device is less than the preconfigured bandwidth, the transceiver 1602 is further configured to receive the synchronization signal, and the processing module 1601 is configured to perform channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0309] In some other embodiments, the transceiver 1602 is configured to receive the synchronization signal, wherein the synchronization signal includes the PBCH, the PBCH carries the first information and the second information, the first information is obtained by rate matching of channel encoded output coded bits, the first information indicates time-frequency resources used to carry random access information, the second information is a redundancy part obtained by redundancy encoding of the first information, a total number of resource elements (REs) occupied by the first information and the second information is X times a number of REs occupied by the first information, and X is a positive integer greater than 1.

[0310] The processing module 1601 is configured to process the synchronization signal according to a size relationship between the bandwidth of the terminal device and the preconfigured bandwidth to obtain the first information, and the transceiver 1602 is further configured to receive the random access information according to the first information.

[0311] Optionally, when the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the processing module 1601 is configured to perform channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information, and perform redundancy decoding on the first information and the second information to obtain the first information.

[0312] Optionally, when the bandwidth of the terminal device is less than the preconfigured bandwidth, the processing module 1601 is configured to perform channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information.

[0313] When the communication apparatus 1600 is configured to implement the functions of the network-side communication apparatus (e.g., a network device) described above, the transceiver module 1602 is configured to:

[0314] In some embodiments, the transceiver module 1602 is configured to transmit a PBCH, the PBCH carrying first information and second information, the first information being rate-matched from channel-encoded output, the first information indicating time-frequency resources for carrying random access information, the second information being a redundancy part of the first information obtained through redundancy encoding, the first information and the second information occupying a total number of REs being X times the number of REs occupied by the first information, X being a positive integer greater than 1; and the transceiver module 1602 is further configured to transmit the random access information.

[0315] Optionally, the first information is carried in a first RB set, the number of RBs in the first RB set being less than the number of RBs in the preconfigured bandwidth.

[0316] Optionally, the maximum index of the RBs in the first RB set is less than the maximum index of the RBs in the preconfigured bandwidth, and / or the minimum index of the RBs in the first RB set is greater than the minimum index of the RBs in the preconfigured bandwidth.

[0317] Optionally, the second information is carried in a second RB set, the second RB set not overlapping with the first RB set, and the first RB set being used to carry the first information.

[0318] Optionally, the second RB set includes a first RB subset and a second RB subset; the maximum index of the RBs in the first RB subset is less than the minimum index in the first RB set, and the minimum index of the RBs in the first RB subset is greater than or equal to the minimum index of the RBs in the preconfigured bandwidth; and / or the minimum index of the RBs in the second RB subset is greater than the maximum index in the first RB set, and the maximum index of the RBs in the second RB subset is less than or equal to the maximum index of the RBs in the preconfigured bandwidth.

[0319] Optionally, any one of the first RB set and the second RB set includes a first RE set and a second RE set; the first RE set in the first RB set is used to carry the first information, the first RE set in the second RB set is used to carry the second information, and the second RE set is used to carry a reference signal.

[0320] Optionally, the transceiver module 1602 is further configured to receive the PBCH from the network device, the frequency domain position of the second RE set being related to a cell identity corresponding to the network device.

[0321] Wherein, all relevant content of each step involved in the above method embodiments can be cited to the function description of the corresponding functional module, which will not be repeated here.

[0322] In the present application, the communication apparatus (i.e. the terminal-side communication apparatus (such as the terminal device described in the above Figs. 8-15) or the network-side communication apparatus (such as the network device described in the above Figs. 8-15)) 1600 is presented in the form of dividing various functional modules in an integrated manner. The "module" here can refer to a specific application-specific integrated circuit (ASIC), a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.

[0323] In some embodiments, when the communication apparatus 1600 in Fig. 16 is a chip or a chip system, the functions / implementation processes of the transceiver module 1602 can be implemented through the input / output interface (or the communication interface) of the chip or the chip system, and the functions / implementation processes of the processing module 1601 can be implemented through the processor (or the processing circuit) of the chip or the chip system.

[0324] Since the communication apparatus 1600 provided by the present embodiment can perform the above method, the technical effects it can obtain can refer to the above method embodiments, which will not be repeated here.

[0325] As another possible product form, the terminal-side communication apparatus (such as the terminal device described in the above Figs. 8-15) or the network-side communication apparatus (such as the network device described in the above Figs. 8-15) described in the present application can adopt the component structure shown in Fig. 17, or include the components shown in Fig. 17. Fig. 17 is a component diagram of a communication apparatus 1700 provided by an embodiment of the present application. The communication apparatus 1700 can be a terminal-side communication apparatus or a chip or a system-on-chip in the terminal-side communication apparatus; or it can be a network-side communication apparatus or a chip or a system-on-chip in the network-side communication apparatus. As shown in Fig. 17, the communication apparatus 1700 includes a processor 1701, a transceiver 1702, and a communication line 1703.

[0326] Further, the communication apparatus 1700 can further include a memory 1704. The processor 1701, the memory 1704, and the transceiver 1702 can be connected through the communication line 1703.

[0327] The processor 1701 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 1701 can also be a device having a processing function, such as a circuit, a device, or a software module, without limitation.

[0328] The transceiver 1702 is configured to communicate with another device or another communication network. The other communication network can be an Ethernet network, a radio access network (RAN), a wireless local area network (WLAN), or the like. The transceiver 1702 can be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0329] The communication line 1703 is configured to connect different components in the communication device 1700, so that the different components can communicate. The communication line 1703 can be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, or the like. For ease of representation, only one thick line is used in FIG. 17, but it does not mean that there is only one bus or only one type of bus.

[0330] The memory 1704 can be a device having a storage function, configured to store instructions and / or data. The instructions can be a computer program.

[0331] The memory 1704 can be a read-only memory (ROM) or other type of static storage device that can store static information and / or instructions that are not to be changed, a random access memory (RAM) or other type of dynamic storage device that can store information and / or instructions for execution by the processor 1701, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk storage or other magnetic storage devices, etc., without limitation.

[0332] It is noted that the memory 1704 can be independent of the processor 1701 or integrated with the processor 1701. The memory 1704 can be used to store instructions or program codes or some data, etc. The memory 1704 can be located in the communication apparatus 1700 or located outside the communication apparatus 1700, without limitation. The processor 1701 is configured to execute the instructions stored in the memory 1704 to implement the communication method for accessing provided by the embodiments described below.

[0333] In an example, the processor 1701 can include one or more CPUs, such as CPU0 and CPU1 in FIG. 17.

[0334] In some embodiments, in hardware implementation, those skilled in the art can conceive that the communication apparatus 1700 can adopt the form of the communication apparatus 1700 shown in FIG. 17.

[0335] As an example, the functions / implementation processes of the processing module 1601 in FIG. 16 can be implemented by the processor 1701 in the communication apparatus 1700 shown in FIG. 17 invoking the computer-executed instructions stored in the memory 1704. The functions / implementation processes of the transceiver module 1602 in FIG. 16 can be implemented by the transceiver 1702 in the communication apparatus 1700 shown in FIG. 17.

[0336] As an optional implementation manner, the communication apparatus 1700 includes multiple processors, for example, in addition to the processor 1701 in FIG. 17, the processor 1707 can also be included.

[0337] As an optional implementation, the communication apparatus 1700 further includes an output device 1705 and an input device 1706. Exemplarily, the input device 1706 is a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc. For example, the input device 1706 can be a keyboard, a mouse, a microphone, a joystick, a touch screen device, a sensor device, etc. The output device 1705 is a display screen, a speaker, etc.

[0338] It should be noted that the communication apparatus 1700 can be a desktop computer, a laptop computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a similar structure to that shown in FIG. 17. In addition, the constituent structures shown in FIG. 17 do not constitute limitation on the communication apparatus, which can include more or fewer components than those shown in the figure, or combine certain components, or have different arrangement of components.

[0339] In embodiments of the present application, a chip system can be composed of a chip, or can include a chip and other discrete devices.

[0340] As still another possible product form, the terminal-side communication apparatus (such as the terminal device described in FIGS. 8-15) or the network-side communication apparatus (such as the network device described in FIGS. 8-15) described in embodiments of the present application can be implemented by a general bus architecture. For ease of illustration, refer to FIG. 18, which is a structural schematic diagram of a communication apparatus 1800 provided in embodiments of the present application. The communication apparatus 1800 includes a processor 1801 and a transceiver 1802. The communication apparatus 1800 can be a terminal-side communication apparatus, or a chip or chip system therein; or the communication apparatus 1800 can be a network-side communication apparatus, or a chip or module therein. FIG. 18 only shows main components of the communication apparatus 1800. In addition to the processor 1801 and the transceiver 1802, the communication apparatus can further include a memory 1803.

[0341] Optionally, the processor 1801 is mainly used for processing communication protocols and communication data, and controlling the whole communication apparatus, executing software programs, and processing data of the software programs. The memory 1803 is mainly used for storing software programs and data. The transceiver 1802 can include a radio frequency circuit and an antenna. The radio frequency circuit is mainly used for conversion between a baseband signal and a radio frequency signal, and processing of the radio frequency signal. The antenna is mainly used for transceiving radio frequency signals in the form of electromagnetic waves.

[0342] Optionally, the processor 1801, the transceiver 1802, and the memory 1803 can be connected through a communication bus.

[0343] When the communication device is powered on, the processor 1801 can read the software program in the memory 1803, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 1801 performs baseband processing on the data to be transmitted, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit converts the baseband signal into a radio frequency signal, and transmits the radio frequency signal in the form of electromagnetic waves through the antenna. When data is transmitted to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1801. The processor 1801 converts the baseband signal into data and processes the data.

[0344] In some embodiments, the transceiver 1802 can include a transmitter and / or a receiver, wherein the transmitter is configured to implement the transmission operations in the above method embodiments; and the receiver is configured to implement the receiving operations in the above method embodiments.

[0345] For example, when the communication device is a chip, the chip can not include the memory 1803, that is, the communication device includes the processor 1801 and the transceiver 1802. At this time, the transceiver 1802 is the input and output interface of the chip, wherein the transmitter in the transceiver corresponds to the output interface of the chip, and the receiver in the transceiver corresponds to the input interface of the chip.

[0346] In some embodiments, the communication device further includes a processor, which is configured to implement the method in any of the above method embodiments.

[0347] As a possible implementation, the communication device further includes a memory. The memory is used to save necessary computer programs or instructions. The processor can call the computer programs or instructions in the memory to make the communication device execute the method in any of the above method embodiments. Of course, the memory can also be external to the communication device.

[0348] As another possible implementation, the communication device further includes an interface circuit, which is a code / data read-write interface circuit. The interface circuit is used to receive computer execution instructions (computer execution instructions are stored in the memory, which can be directly read from the memory or can pass through other devices) and transmit them to the processor.

[0349] As yet another possible implementation, the communication device further includes a communication interface, which is used to communicate with modules outside the communication device.

[0350] It can be understood that the communication apparatus can be a chip or a chip system, when the communication apparatus is a chip system, the communication apparatus can be composed of a chip, or can include a chip and other discrete devices, and embodiments of the present application do not make specific limitations.

[0351] The present application also provides a computer readable storage medium, which stores a computer program or instructions, and the computer program or instructions realize the functions of any of the method embodiments when executed by a computer.

[0352] The present application also provides a computer program product, which realizes the functions of any of the method embodiments when executed by a computer.

[0353] Those skilled in the art can understand that, for the convenience and brevity of description, the specific working processes of the above-described system, apparatus and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0354] It can be understood that the system, apparatus and method described in the present application can also be implemented in other ways. For example, the apparatus embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, apparatus or unit, and can be electrical, mechanical or other forms.

[0355] The units described as separate components can or can not be physically separate, that is, can be located in one place, or can be distributed on a plurality of network units. The components shown as units can or can not be physical units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment.

[0356] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0357] In the embodiments described above, all or some of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the embodiments can be implemented in the form of a computer program product storing computer program instructions. The computer program instructions are executed in a computer to implement the procedures or functions described in the embodiments of the present application. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer program 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 program instructions can be transmitted from a website, a computer, a server or a data center to another website, computer, server or data center through a wired (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or data storage device including one or more servers, data centers, etc. integrated with the medium. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state drive (SSD)), etc. In the embodiments of the present application, the computer can include the device described above.

[0358] Although the present application is described herein in conjunction with various embodiments, it is understood that other variations of the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from an inspection of the drawings, the disclosure, and the appended claims. The word "comprising" does not exclude other components or steps not listed in the claims. The word "a" or "an" does not exclude a plurality. A single processor or other unit can fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to an advantage.

Claims

A communication method for access, characterized by The method comprises: receiving a physical broadcast channel (PBCH), the PBCH being used to carry first information and second information, the first information being rate-matched from channel-encoded output bits, the first information indicating time-frequency resources for carrying random access information, the second information being a redundancy part of the first information obtained through redundancy encoding, a total number of resource elements (REs) occupied by the first information and the second information being X times a number of REs occupied by the first information, X being a positive integer greater than 1; receiving the random access information according to the PBCH. The method of claim 1, wherein The method is performed by a terminal device, and when a bandwidth of the terminal device is greater than or equal to a preconfigured bandwidth, the PBCH is received, comprising: receiving a synchronization signal, the synchronization signal comprising the PBCH, the PBCH carrying the first information and the second information; The method further comprises: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information and the second information; performing redundancy decoding on the first information and the second information to obtain the first information. The method of claim 1, wherein The method is performed by a terminal device, and when a bandwidth of the terminal device is less than a preconfigured bandwidth, the PBCH is received, comprising: receiving a synchronization signal, the synchronization signal comprising the PBCH, the PBCH carrying the first information; The method further comprises: performing channel estimation, channel equalization, and demodulation on the synchronization signal to obtain the first information. A communication method for access, characterized by The method comprises: sending a physical broadcast channel (PBCH), the PBCH being used to carry first information and second information, the first information being rate-matched from channel-encoded output bits, the first information indicating time-frequency resources for carrying random access information, the second information being a redundancy part of the first information obtained through redundancy encoding, a total number of resource elements (REs) occupied by the first information and the second information being X times a number of REs occupied by the first information, X being a positive integer greater than 1; sending the random access information. A communication method for access, characterized by The method of the terminal device comprises: receiving a synchronization signal, the synchronization signal comprising a physical broadcast channel (PBCH), the PBCH being used to carry first information and second information, the first information being rate-matched from channel-encoded output bits, the first information indicating time-frequency resources for carrying random access information, the second information being a redundancy part of the first information obtained through redundancy encoding, a total number of resource elements (REs) occupied by the first information and the second information being X times a number of REs occupied by the first information, X being a positive integer greater than 1; processing the synchronization signal according to a size relationship between a bandwidth of the terminal device and a preconfigured bandwidth to obtain the first information; receiving the random access information according to the first information. The method according to claim 5, characterized in that When the bandwidth of the terminal device is greater than or equal to the preconfigured bandwidth, the PBCH carries the first information and the second information; The processing of the synchronization signal to obtain the first information comprises: channel estimation, channel equalization and demodulation on the synchronization signal to obtain the first information and the second information; performing redundancy decoding on the first information and the second information to obtain the first information. The method according to claim 5, characterized in that When the bandwidth of the terminal device is less than the preconfigured bandwidth, the PBCH carries the first information. The processing of the synchronization signal to obtain the first information comprises: channel estimation, channel equalization and demodulation on the synchronization signal to obtain the first information. The method according to any one of claims 1 to 7, characterized in that The first information is carried in a first resource block (RB) set, and the number of RBs in the first RB set is less than the number of RBs in the preconfigured bandwidth. The method of claim 8, wherein The maximum index of the RBs in the first RB set is less than the maximum index of the RBs in the preconfigured bandwidth, and / or the minimum index of the RBs in the first RB set is greater than the minimum index of the RBs in the preconfigured bandwidth. The method according to any one of claims 1 to 9, characterized in that The second information is carried in a second RB set, and the first RB set and the second RB set do not overlap. The method of claim 10, wherein The second RB set comprises a first RB subset and a second RB subset. The maximum index of the RBs in the first RB subset is less than the minimum index of the RBs in the first RB set, and the minimum index of the RBs in the first RB subset is greater than or equal to the minimum index of the RBs in the preconfigured bandwidth. The minimum index of the RBs in the second RB subset is greater than the maximum index of the RBs in the first RB set, and the maximum index of the RBs in the second RB subset is less than or equal to the maximum index of the RBs in the preconfigured bandwidth. The first RB set and the second RB set each comprise a first RE set and a second RE set. The method according to claim 10 or 11, characterized in that The first RE set in the first RB set is used to carry the first information, the first RE set in the second RB set is used to carry the second information, and the second RE set in the first RB set and the second RB set is used to carry a reference signal. The communication apparatus comprises a transceiver module and a processing module, A communication device, characterized by The transceiver module is configured to perform the receiving or transmitting in the method of any one of claims 1-3, 8-12, or the receiving or transmitting in the method of any one of claims 4, 8-12, or the receiving or transmitting in the method of any one of claims 5-12. The processing module is configured to perform the processing in the method of any one of claims 1-3, 8-12, or the processing in the method of any one of claims 4, 8-12, or the processing in the method of any one of claims 5-12. The communication apparatus comprises a processor, and the processor is configured to run a computer program or instructions to cause the communication apparatus to perform the method of any one of claims 1-3, 8-12, or the method of any one of claims 4, 8-12, or the method of any one of claims 5-12. A communication device characterized by comprising: ​ The apparatus of claim 14, wherein The communication device further comprises a memory for storing computer programs or instructions required for performing the method according to any one of claims 1-3, 8-12, or for storing computer programs or instructions required for performing the method according to any one of claims 4, 8-12, or for storing computer programs or instructions required for performing the method according to any one of claims 5-12. A computer-readable storage medium, characterized by A computer readable storage medium stores computer instructions or programs which, when run on a computer, cause the method according to any one of claims 1-3, 8-12 to be performed, or cause the method according to any one of claims 4, 8-12 to be performed, or cause the method according to any one of claims 5-12 to be performed. A computer program product, characterized by The computer program product comprises computer programs or instructions; when part or all of the computer instructions are run on a computer, cause the method according to any one of claims 1-3, 8-12 to be performed, or cause the method according to any one of claims 4, 8-12 to be performed, or cause the method according to any one of claims 5-12 to be performed.

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