Information sending and receiving method, device and system

Abstract

The embodiment of the invention provides an information sending and receiving method, device and system, which can provide a synchronization signal and a PBCH (Physical Broadcast Channel) for a narrowband terminal and reduce resource overhead at the same time. In the method, a network device determines and sends a synchronization signal, first information and second information, the synchronization signal is shared by a broadband terminal and a narrowband terminal, the first information is carried by a first physical broadcast channel (PBCH), the second information is carried by a second PBCH, and the bandwidth occupied by the second PBCH is smaller than the bandwidth occupied by the first PBCH. The working bandwidth of the broadband terminal is greater than or equal to the bandwidth occupied by the first PBCH, and the working bandwidth of the narrowband terminal is greater than or equal to the bandwidth occupied by the second PBCH.

Description

[0001] This application is a divisional application. The application number of the original application is 202080104991.1, and the original application date is September 30, 2020. The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of communications, and in particular to methods, devices, and systems for sending and receiving information. Background Art

[0003] Currently, the fifth generation (5G) mobile communication system's new radio (NR) defines a synchronization signal / physical broadcast channel block (SS / PBCH block, SSB). The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH).

[0004] like Figure 1 As shown, in the time domain, one SSB occupies four consecutive orthogonal frequency division multiplexing (OFDM) symbols. In the frequency domain, it occupies 240 consecutive subcarriers, which are numbered from 0 to 239 in ascending order of frequency.

[0005] However, the above solution is mainly used for broadband terminals. When narrowband terminals are introduced into the system, if this solution is continued, some problems may occur. Summary of the Invention

[0006] The present application provides a method, device and system for sending and receiving information suitable for narrowband terminals.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, a method for transmitting information is provided. The method is applied to a first communication system, wherein a network device determines and transmits a synchronization signal, first information, and second information. The first information is carried via a first physical broadcast channel (PBCH), and the second information is carried via a second PBCH, and the first information and the second information are different.

[0009] Based on this solution, in the first communication system, the network device sends a synchronization signal, first information, and second information, and the first information is carried by the first PBCH, and the second information is carried by the second PBCH. On the one hand, since the bandwidth occupied by the synchronization signal is small, the working bandwidth of the narrowband terminal can include the bandwidth occupied by the synchronization signal, so the narrowband terminal can receive the synchronization signal. In addition, the narrowband terminal can receive the first PBCH and the second PBCH, or receive the second PBCH, according to its working bandwidth, thereby receiving the first information and the second information, or receiving the second information. Therefore, for the narrowband terminal, the present application can provide it with the synchronization signal and the information carried by the PBCH. On the other hand, the working bandwidth of the broadband terminal in the first communication system can also include the bandwidth occupied by the synchronization signal, so the broadband terminal can also receive the synchronization signal. In other words, the synchronization signal can be shared by the narrowband terminal and the broadband terminal, so there is no need to provide the narrowband terminal and the broadband terminal with their own synchronization signals, thereby reducing resource overhead.

[0010] In some possible designs, the second information includes at least one of the following: first sub-information, which is used to schedule the first system information block SIB1, or to configure the first physical downlink control channel PDCCH, which is used to schedule the first SIB1; second sub-information, which is used to indicate whether the cell corresponding to the second PBCH is a prohibited cell; third sub-information, which is used to indicate whether selection of a co-frequency cell of a prohibited cell is allowed; and fourth sub-information, which is used to indicate whether the system information is updated.

[0011] Based on this scheme, when the first sub-information is included in the second information, the first PDCCH for scheduling the first SIB1 can be configured for the narrowband terminal, so that when the second PDCCH for scheduling the second SIB1 is configured for the broadband terminal in the first information, the number of resource blocks occupied by the control resource set corresponding to the second PDCCH can be not restricted, thereby not affecting the configuration flexibility of the second PDCCH and the demodulation performance of the second PDCCH; when the second sub-information or the third sub-information is included in the second information, an independent cell prohibition indication or same-frequency reselection indication can be provided for the narrowband terminal, thereby improving the configuration flexibility; when the fourth sub-information is included in the second information, the fourth sub-information is used to indicate that the system information is updated, and the terminal device receives the updated system information. When the fourth sub-information is used to indicate that the system information is not updated, the terminal device does not need to receive the system information, thereby reducing unnecessary reception of system information and saving power consumption of the terminal device.

[0012] In some possible designs, the first information includes the system frame number of the frame in which the aforementioned synchronization signal is located, and the second information does not include the system frame number; or, the first information includes N high bits of the system frame number, and the second information does not include N high bits of the system frame number, where N is a positive integer.

[0013] Based on this solution, when the terminal device can receive the first information and the first information includes the system frame number, the second information may not include the system frame number. When the first information includes N high-order bits of the system frame number, the second information may not include the N high-order bits of the system frame number. At this time, the terminal device can multiplex the system frame number included in the first information or the N high-order bits of the system frame number to reduce signaling overhead.

[0014] In some possible designs, the second information includes the system frame number of the frame in which the synchronization signal is located or the N high-order bits of the system frame number. For example, when the operating bandwidth of the terminal device is less than the bandwidth occupied by the first PBCH, the second information includes the system frame number of the frame in which the synchronization signal is located or the N high-order bits of the system frame number.

[0015] In some possible designs, the bandwidth occupied by the second PBCH is smaller than the bandwidth occupied by the first PBCH.

[0016] Based on the above two possible designs, when the bandwidth occupied by the second PBCH is smaller than the bandwidth occupied by the first PBCH, the narrowband terminal may not be able to receive the first information on the first PBCH, and thus cannot obtain the system frame number of the frame where the synchronization signal is located. In this case, the second information includes the system frame number of the frame where the synchronization signal is located or the N high-order bits of the system frame number, so that the narrowband terminal can obtain the system frame number or its N high-order bits, and thus perform subsequent processing according to the system frame number or its N high-order bits, for example, receiving subsequent system information and paging messages, initiating random access, etc.

[0017] In some possible designs, the aforementioned synchronization signal and the first PBCH constitute an SSB, the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, the time domain position of the second PBCH is the same as the time domain position of the SSB, or is included in the time domain position of the SSB; or, the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB.

[0018] Based on this possible design, the time domain position of the second PBCH is included in the time domain position of the SSB composed of the synchronization signal and the first PBCH, and the frequency domain position is adjacent to the frequency domain position of the SSB, thereby reducing the impact of the second PBCH on the energy saving mechanism of the network equipment through frequency division multiplexing. Alternatively, the time domain position of the second PBCH is different from the time domain position of the SSB composed of the synchronization signal and the first PBCH, so that the occupation of spectrum resources can be reduced through time division multiplexing.

[0019] In some possible designs, the first information includes fifth sub-information. When the frequency domain position of the second PBCH is adjacent to the frequency domain position of the aforementioned SSB, the fifth sub-information is used to indicate that the frequency domain position of the second PBCH is located at the high frequency position and / or low frequency position of the frequency domain position of the SSB; when the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the fifth sub-information is used to indicate that the time domain position of the second PBCH is located before and / or after the time domain position of the SSB.

[0020] In some possible designs, the first information includes sixth sub-information, where the sixth sub-information is used to indicate that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell. Alternatively, the sixth sub-information is used to indicate that the second PBCH does not exist in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell.

[0021] Based on this possible design, the terminal device receives the second information when the sixth sub-information indicates that there is a second PBCH in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell, and does not receive the second information when the sixth sub-information indicates that there is no second PBCH in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell. The implementation on the network device side is more flexible. The terminal device can receive or not receive the second information according to the sixth sub-information, and can avoid blind reception when the network device does not send the second information, thereby reducing the power consumption of the terminal device.

[0022] In some possible designs, the first information includes seventh sub-information, which indicates the number of resource blocks occupied by the control resource set CORESET corresponding to the second PDCCH. When the number is greater than the first threshold, there is a second PBCH in the first communication system, and the second PDCCH is used to schedule the second SIB1.

[0023] Based on this possible design, the number of RBs occupied by the CORSET corresponding to the second PDCCH implicitly indicates whether there is a second PBCH in the system, which can reduce signaling overhead. At the same time, the terminal device can first determine whether there is a second PBCH, and will not receive the second information if it does not exist, thereby reducing the waste of terminal power consumption.

[0024] In some possible designs, a network device sends first information and second information, including: the network device encodes the first information according to a first cyclic redundancy check code CRC to obtain the encoded first information, and encodes the second information according to a second CRC to obtain the encoded second information, the number of bits of the first CRC is different from the number of bits of the second CRC; the network device sends the encoded first information and the encoded second information.

[0025] Based on this possible design, the second information is coded and modulated using a CRC checksum, ensuring the performance of the second PBCH through the CRC's strong error detection capability. Furthermore, the CRC system message is small and simple to use, which can reduce the implementation complexity of the solution.

[0026] In some possible designs, the second information is represented by a sequence. Based on this possible design, the second information carried by the second PBCH is represented by a sequence. When receiving the second information, the terminal device does not need to perform complex decoding operations, but can only perform simple correlation operations. This can reduce the processing complexity of the terminal device, thereby reducing the requirements for the terminal device hardware and further reducing the cost of the terminal device.

[0027] In some possible designs, the synchronization signal includes a secondary synchronization signal SSS, and an EPRE ratio of energy per resource element (EPRE) between the second PBCH and the SSS is X decibels, where X is greater than or equal to 0. Based on this possible design, since in the NR system, the SSS and the first PBCH have the same EPRE, that is, the ratio between the EPRE of the first PBCH and the EPRE of the SSS is 0 dB, when X is greater than 0, the EPRE of the second PBCH is greater than the EPRE of the first PBCH, that is, the transmit power of the second PBCH is higher, thereby achieving better coverage performance compared to the first PBCH.

[0028] In some possible designs, the bandwidth occupied by the second PBCH is smaller than the bandwidth occupied by the first PBCH.

[0029] In a second aspect, a method for receiving information is provided. This method is applied to a first communication system. In this method, a terminal device receives a synchronization signal from a network device, obtains a cell identifier based on the synchronization signal, and receives first information and second information based on the cell identifier, or receives the second information based on the cell identifier. The first information is carried via a first PBCH, and the second information is carried via a second PBCH. The first information and the second information are different. The technical effects of the second aspect can be found in the technical effects of the first aspect described above and will not be repeated here.

[0030] In some possible designs, the second information includes at least one of the following: first sub-information, which is used to schedule the first system information block SIB1, or to configure the first physical downlink control channel PDCCH, which is used to schedule the first SIB1; second sub-information, which is used to indicate whether the cell corresponding to the second PBCH is a prohibited cell; third sub-information, which is used to indicate whether selection of a co-frequency cell of a prohibited cell is allowed; and fourth sub-information, which is used to indicate whether the system information is updated.

[0031] In some possible designs, the first information includes the system frame number of the frame in which the aforementioned synchronization signal is located, and the second information does not include the system frame number; or, the first information includes N high bits of the system frame number, and the second information does not include N high bits of the system frame number, where N is a positive integer.

[0032] In some possible designs, the second information includes the system frame number of the frame in which the synchronization signal is located or the N high-order bits of the system frame number. For example, when the operating bandwidth of the terminal device is less than the bandwidth occupied by the first PBCH, the second information includes the system frame number of the frame in which the synchronization signal is located or the N high-order bits of the system frame number.

[0033] In some possible designs, the aforementioned synchronization signal and the first PBCH constitute an SSB, the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, the time domain position of the second PBCH is the same as the time domain position of the SSB, or is included in the time domain position of the SSB; or, the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB.

[0034] In some possible designs, the first information includes fifth sub-information. When the frequency domain position of the second PBCH is adjacent to the frequency domain position of the aforementioned SSB, the fifth sub-information is used to indicate that the frequency domain position of the second PBCH is located at the high frequency position and / or low frequency position of the frequency domain position of the SSB; when the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the fifth sub-information is used to indicate that the time domain position of the second PBCH is located before and / or after the time domain position of the SSB.

[0035] Optionally, the terminal device receives the second information based on the cell identifier, which may include: the terminal device determines the frequency domain position of the second PBCH based on the fifth sub-information, and receives the second information at the frequency domain position of the second PBCH based on the cell identifier; or, the terminal device determines the time domain position of the second PBCH based on the fifth sub-information, and receives the second information at the time domain position of the second PBCH based on the cell identifier.

[0036] In some possible designs, the first information includes sixth sub-information, where the sixth sub-information is used to indicate that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell. Alternatively, the sixth sub-information is used to indicate that the second PBCH does not exist in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell.

[0037] Optionally, when the sixth sub-information is used to indicate that there is a second PBCH in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell, the terminal device receives the first information and the second information according to the cell identifier, which may include: the terminal device receives the first information according to the cell identifier, and receives the second information according to the sixth sub-information included in the first information.

[0038] In some possible designs, the first information includes seventh sub-information, which indicates the number of resource blocks occupied by the control resource set CORESET corresponding to the second PDCCH. The information receiving method also includes: when the number is greater than the first threshold, the terminal device determines that there is a second PBCH in the first communication system, and the second PDCCH is used to schedule the second SIB1.

[0039] In some possible designs, the terminal device receives the first information and the second information according to the cell identifier, including: the terminal device receives the encoded first information and the encoded second information according to the cell identifier, performs a CRC check on the encoded first information according to the first CRC to obtain the first information, and performs a CRC check on the encoded second information according to the second CRC to obtain the second information, the number of bits of the first CRC is different from the number of bits of the second CRC.

[0040] In some possible designs, the second information is represented by a sequence.

[0041] In some possible designs, the synchronization signal includes a secondary synchronization signal SSS, and an energy per resource element (EPRE) ratio between the second PBCH and the SSS is X decibels, where X is greater than or equal to 0.

[0042] Among them, the technical effects brought about by any possible design of the second aspect can refer to the technical effects brought about by the corresponding design of the above-mentioned first aspect, and will not be repeated here.

[0043] In a third aspect, a communication device is provided for implementing the various methods described above. The communication device may be the network device described in the first aspect, or a device including the network device described above, or a device included in the network device described above, such as a chip; or the communication device may be the terminal device described in the second aspect, or a device including the terminal device described above, or a device included in the terminal device described above, such as a chip. The communication device includes modules, units, or means corresponding to the methods described above, which may be implemented by hardware, software, or by executing corresponding software implementations in hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

[0044] In a fourth aspect, a communication device is provided, comprising: a processor and a memory; the memory is configured to store computer instructions, and when the processor executes the instructions, the communication device performs the method described in any of the above aspects. The communication device may be the network device described in the first aspect, or a device including the network device, or a device included in the network device, such as a chip; or the communication device may be the terminal device described in the second aspect, or a device including the terminal device, or a device included in the terminal device, such as a chip.

[0045] In a fifth aspect, a communication device is provided, comprising: a processor; the processor is configured to be coupled to a memory and, after reading instructions from the memory, execute the method described in any of the above aspects in accordance with the instructions. The communication device may be the network device described in the first aspect, or a device including the network device, or a device included in the network device, such as a chip; or the communication device may be the terminal device described in the second aspect, or a device including the terminal device, or a device included in the terminal device, such as a chip.

[0046] In a sixth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium. When the computer-readable storage medium is run on a computer, the computer can execute the method described in any one of the above aspects.

[0047] In a seventh aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method described in any one of the above aspects.

[0048] In an eighth aspect, a communication device is provided, comprising: an interface circuit and at least one processor. The interface circuit may be a code / data read / write interface circuit, the interface circuit being configured to receive computer-executable instructions (the computer-executable instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor; the processor being configured to execute the computer-executable instructions to perform the method described in any of the above aspects. The communication device may be the network device described in the first aspect, or a device including the network device, or a device included in the network device, such as a chip; or the communication device may be the terminal device described in the second aspect, or a device including the terminal device, or a device included in the terminal device, such as a chip.

[0049] In a ninth aspect, a communication device (for example, a chip or a chip system) is provided, wherein the communication device includes a processor for implementing the functions involved in any of the above aspects. In one possible design, the communication device also includes a memory for storing necessary program instructions and data. When the communication device is a chip system, it can be composed of a chip or include a chip and other discrete devices.

[0050] Among them, the technical effects brought about by any design method in the third to ninth aspects can refer to the technical effects brought about by different design methods in the above-mentioned first or second aspects, and will not be repeated here.

[0051] In a tenth aspect, a communication system is provided, which includes the terminal device described in the above aspect and the network device described in the above aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural diagram of an existing SSB;

[0053] Figure 2 A schematic diagram of the structure of an existing time-frequency resource grid;

[0054] Figure 3 A schematic diagram comparing the operating bandwidth of a narrowband terminal and the SSB occupied bandwidth;

[0055] Figure 4 A schematic diagram comparing the operating bandwidth of a narrowband terminal and the SSB occupied bandwidth;

[0056] Figure 5 A schematic structural diagram of a first communication system provided in an embodiment of the present application;

[0057] Figure 6 A schematic diagram of the structure of the terminal device and network device provided in the embodiment of the present application;

[0058] Figure 7 A flowchart of a method for sending and receiving information provided in an embodiment of the present application;

[0059] Figure 8a A schematic diagram of the frequency domain position of a second PBCH provided in an embodiment of the present application;

[0060] Figure 8b A schematic diagram of the frequency domain position of another second PBCH provided in an embodiment of the present application;

[0061] Figure 8c A schematic diagram of the frequency domain position of another second PBCH provided in an embodiment of the present application;

[0062] Figure 9a A schematic diagram of the time domain position of a second PBCH provided in an embodiment of the present application;

[0063] Figure 9b A schematic diagram of the time domain position of another second PBCH provided in an embodiment of the present application;

[0064] Figure 9c A schematic diagram of the time domain position of another second PBCH provided in an embodiment of the present application;

[0065] Figure 10 A schematic diagram of the structure of another network device provided in an embodiment of the present application;

[0066] Figure 11 A schematic diagram of the structure of another terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] To facilitate understanding of the solutions in the embodiments of this application, a brief introduction or definition of the relevant technologies is first given as follows:

[0068] 1. Internet of Things (IoT):

[0069] IoT stands for "Internet of Things." It extends the internet's user-side capabilities to any object, enabling information exchange and communication between them. This type of communication is also known as machine-type communications (MTC). The communicating nodes are called IoT terminals or IoT devices. Typical IoT applications include connected vehicles, smart communities, industrial monitoring and control, smart metering, smart grids, smart agriculture, smart transportation, smart homes, and environmental monitoring.

[0070] Because the IoT needs to be applied in a variety of scenarios, from outdoor to indoor, above ground to underground, it places many unique requirements on IoT design. For example, in some scenarios, IoT terminals are used in environments with poor coverage. For example, electricity and water meters are often installed indoors or even in basements, where wireless network signals are weak. Therefore, coverage enhancement technologies are needed. Alternatively, in some scenarios, the number of IoT terminals far exceeds the number of devices used for interpersonal communication, necessitating large-scale deployment. Therefore, IoT terminals must be available and used at a very low cost. Furthermore, in some scenarios, IoT terminals transmit very small data packets and are not sensitive to latency, requiring low-speed data rates. Furthermore, in most cases, IoT terminals are battery-powered, yet in many scenarios, they are required to last for more than ten years without battery replacement, requiring them to operate with extremely low power consumption.

[0071] 2.NR:

[0072] In NR, the basic unit in the frequency domain is a subcarrier, and the subcarrier spacing (SCS) can be 15kHz, 30kHz, etc. In the NR physical layer, the unit of uplink or downlink frequency domain resources is the physical resource block (PRB), and each PRB consists of 12 consecutive subcarriers in the frequency domain.

[0073] For example, the NR downlink time-frequency resource grid is as follows: Figure 2 As shown. Among them, = represents the number of downlink RBs. Each element on the resource grid is called a resource element (RE). An RE is the smallest physical resource, consisting of a subcarrier within an OFDM symbol. The uplink time-frequency resource grid is similar to the downlink time-frequency resource grid and will not be described in detail here.

[0074] The basic time unit for NR downlink resource scheduling is a time slot. Generally speaking, a time slot consists of 14 OFDM symbols in time. In the time domain, NR transmission is organized into 10 millisecond (ms) frames. Each frame is identified by a system frame number (SFN), and the SFN period is equal to 1024. Each frame consists of 10 subframes with a length of 1ms, and each subframe includes one or more time slots. The number of time slots included in each subframe is determined by the subcarrier spacing. When the subcarrier spacing is 15kHz, each subframe contains one time slot.

[0075] 3. NR SSB:

[0076] Among them, NR SSB is as described in the background technology. Figure 1 As shown, including PSS, SSS, and PBCH, the first OFDM symbol numbered 0 carries PSS, subcarriers numbered 0 to 55 and 183 to 239 are set to 0, and subcarriers numbered 56 to 182 are subcarriers occupied by PSS; OFDM symbols numbered 1 and 3 carry PBCH, and there is a modulation and demodulation reference signal (DMRS) corresponding to PBCH in every 4 consecutive subcarriers; OFDM symbol numbered 2 carries SSS and PBCH, subcarriers numbered 56 to 182 are subcarriers occupied by SSS, subcarriers numbered 0 to 47 and 192 to 239 are subcarriers occupied by PBCH, and the remaining subcarriers are set to 0.

[0077] The PBCH carries the master information block (MIB), which includes the system frame number, which is carried by the systemFrameNumber field and is used for synchronization between the terminal device and the network. It should be noted that the MIB includes the six most significant bits (MSBs) of the 10-bit system frame number.

[0078] Optionally, the MIB may also include one or more of the following information:

[0079] Subcarrier Spacing: Carried by the subCarrierSpacingCommon field, it is used to indicate the subcarrier spacing used by system information block (SIB) 1 (SIB1), message 2 or message 4 during the initial access process, paging messages, and broadcast system information (SI) messages.

[0080] Subcarrier offset: carried by the ssb-SubcarrierOffset field and used to calculate the subcarrier offset from subcarrier 0 of the common resource block (CRB) to subcarrier 0 of the SSB.

[0081] DMRS position indication: carried by the dmrs-TypeA-Position field, used to indicate the position of the first DMRS in the uplink or downlink.

[0082] The PDCCH configuration for scheduling SIB1 is carried by the pdcch-ConfigSIB1 field, indicating the control resource set (CORESET) 0 and search space configuration information for receiving SIB1.

[0083] Cell barring indication: carried by the cellBarred field, used to indicate whether the cell is a barred cell (barred cell).

[0084] Intra-frequency reselection indication: carried by the intraFreqReselection field, indicating that when the highest-level cell is prohibited or regarded as prohibited by the terminal device, the terminal device is allowed to select other cells with the same frequency as the prohibited cell during cell selection / reselection.

[0085] Spare field: spare, which occupies 1 bit.

[0086] In addition to the MIB, the PBCH also carries another payload. This payload is transmitted in the PBCH transport block as part of the channel coding. That is, this payload is outside the MIB coding and is added at the physical layer before the MIB coding. This payload occupies 8 bits and is used to carry the 4 least significant bits of the system frame number, the SSB index, etc. Currently, there are 2 idle bits in this 8-bit payload.

[0087] It should be noted that, for the convenience of description, in the following embodiments, the PBCH included in the NR SSB is referred to as the first PBCH; the PDCCH configured by the pdcch-ConfigSIB1 field in the MIB carried by the first PBCH is referred to as the second PDCCH; the other part of the payload carried in the first PBCH other than the MIB is referred to as the first payload; the SIB scheduled by the second PDCCH is referred to as the second SIB1, wherein the first PDCCH and the first SIB1 will be described in subsequent embodiments, and the second SIB1 can be understood as the SIB1 for broadband terminals. This is explained uniformly here and will not be repeated below.

[0088] Since large bandwidth places high demands on baseband processing hardware, such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), fast Fourier transforms (FFTs), buffers, and uplink and downlink processing modules, narrow bandwidth can relax these hardware requirements, thereby reducing costs. Therefore, to support relatively low-cost IoT applications, the most direct approach is to reduce the operating bandwidth of the terminal, that is, to use narrowband terminals to implement IoT applications. Narrowband terminals that implement IoT applications can also be called IoT terminals or IoT devices.

[0089] However, when a narrowband terminal is introduced into the system, if a new narrowband SSB including PSS, SSS and PBCH that is different from the aforementioned NR SSB is introduced for the narrowband terminal, the network resource overhead is large.

[0090] It is understandable that after the narrowband terminal is introduced into the system, the narrowband terminal does not have to be used to complete the Internet of Things application, and can also have other uses, that is, the application scenario of this application is not limited to the IoT scenario.

[0091] Based on this, this application considers multiplexing the PSS and SSS of NR SSB when introducing narrowband terminals, and redesigning PBCH for narrowband terminals.

[0092] In a possible implementation, for a narrowband terminal with an operating bandwidth of about 5 MHz, when the subcarrier spacing is 15 kHz, Figure 1 The frequency domain bandwidth occupied by PSS and SSS is about 2MHz, and the frequency domain bandwidth occupied by the first PBCH is about 3.6MHz. Therefore, this type of narrowband terminal can fully receive NR SSB, such as Figure 3 As shown. At this time, for the PBCH design for narrowband terminals, a relatively simple solution is to reuse the first PBCH. However, through analysis, this solution may have the following problems:

[0093] 1) It affects the configuration flexibility of network equipment and the demodulation performance of the PDCCH that schedules SIB1.

[0094] In the MIB carried by the first PBCH, the configuration information of the PDCCH that schedules SIB1 is carried through the pdcch-ConfigSIB1 field. The number of resource blocks (RBs) occupied by the CORESET corresponding to the PDCCH that schedules SIB1 configured by this parameter is 24, 48, or 96. When it occupies a minimum of 24 RBs, the corresponding frequency domain bandwidth is 4.32MHz. If a narrowband terminal with a working bandwidth of about 5MHz supports reading the MIB carried by the first PBCH and the second SIB1, it is necessary to restrict the configuration of the network device, for example, restricting the network device to configure the number of RBs occupied by the CORESET corresponding to the PDCCH that schedules the second SIB1 (i.e., the second PDCCH) to 24. This restriction affects the configuration flexibility of the network device. In addition, configuring the number of RBs to 24 will affect the demodulation performance of the second PDCCH.

[0095] 2) It is impossible to provide cell barring indication or same-frequency reselection indication for narrowband terminals.

[0096] In the MIB carried by the first PBCH, the cellBarred or intraFreqReselection fields carry the cell barring indication or intra-frequency reselection indication respectively. This function is used to temporarily prevent the terminal from accessing the cell during maintenance. The earlier the notification of this indication is, the sooner the terminal can know whether it is allowed to access the cell, avoiding more unnecessary reception. For example, in the prior art, if the MIB indicates that the terminal is prohibited from accessing the cell, the terminal will stop receiving the SIB1 of the cell. If the SIB1 indicates that the access to the cell is prohibited, the terminal will not know until after receiving the MIB and SIB1, which will increase the power consumption of the terminal receiving SIB1.

[0097] As can be seen from the above introduction, there are only a few idle bits in the MIB carried by the first PBCH, only one bit, and this one bit cannot be used to provide a cell barring indication or a same-frequency reselection indication for a narrowband terminal. If a narrowband terminal reuses the cell barring indication or the same-frequency reselection indication in the MIB, it will affect the configuration flexibility of the network equipment. For example, when the network equipment indicates cell barring, it prevents both broadband terminals and narrowband terminals from accessing the cell, and it is impossible to configure different cell barring indications or same-frequency reselection indications for the same cell for broadband terminals and narrowband terminals.

[0098] In another possible implementation, for a narrowband terminal with an operating bandwidth of about 2 MHz, when the subcarrier spacing is 15 kHz, Figure 1 It can be seen that this type of narrowband terminal can fully receive the PSS and SSS of the NR SSB, but cannot receive the complete first PBCH, such as Figure 4 shown.

[0099] At this time, for the PBCH design for narrowband terminals, a relatively simple solution is to reuse the first PBCH within the PSS and SSS frequency domain bandwidth. However, after numerical analysis, the first PBCH within the PSS and SSS frequency domain bandwidth accounts for about 50% of the complete first PBCH. If only the first PBCH within the PSS and SSS frequency domain bandwidth is received, the demodulation performance of the first PBCH will be reduced, and the coverage performance will also be reduced. In addition, this implementation method also has Figure 3 Problem in the scenario shown.

[0100] From the above analysis, it can be concluded that narrowband terminals may not be able to directly use the existing NR SSB. Therefore, the following embodiments of the present application provide an information sending and receiving method to design a reasonable PBCH suitable for narrowband terminals.

[0101] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. In the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B. The "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, a and b and c, where a, b, c can be single or multiple.

[0102] 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, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0103] like Figure 5As shown, a first communication system 10 provided in an embodiment of the present application is provided. The first communication system 10 includes at least one network device 20 and one or more terminal devices 30 connected to the network device 20. Optionally, different terminal devices 30 can communicate with each other.

[0104] Optionally, the first communication system 10 may be an NR system or a new future-oriented network system. For example, the embodiment of the present application may be applicable to IoT applications of the NR system, and the embodiment of the present application is not specifically limited to this. In actual applications, the first communication system is not limited to this, and is described uniformly here, and will not be repeated below. In addition, the term "system" and "network" can be interchangeable.

[0105] by Figure 5 Taking the interaction between the network device 20 shown and any terminal device 30 as an example, in the embodiment of the present application, the network device determines and sends a synchronization signal, first information, and second information, wherein the first information is carried by a first PBCH and the second information is carried by a second PBCH, and the first information and the second information are different. Accordingly, the terminal device receives the synchronization signal from the network device and obtains a cell identifier based on the synchronization signal. Thereafter, the terminal device receives the first information and the second information based on the cell identifier, or receives the second information based on the cell identifier.

[0106] Based on this solution, in the first communication system, the network device sends a synchronization signal, first information, and second information, and the first information is carried by the first PBCH, and the second information is carried by the second PBCH. On the one hand, since the bandwidth occupied by the synchronization signal is relatively small, the working bandwidth of the narrowband terminal can include the bandwidth occupied by the synchronization signal, so the narrowband terminal can receive the synchronization signal. In addition, the narrowband terminal can receive the first PBCH and the second PBCH, or receive the second PBCH, according to its working bandwidth, thereby receiving the first information and the second information, or receiving the second information. Therefore, for the narrowband terminal, the present application can provide it with the synchronization signal and the information carried by the PBCH; on the other hand, the working bandwidth of the broadband terminal in the first communication system can also include the bandwidth occupied by the synchronization signal, so the broadband terminal can also receive the synchronization signal. In other words, the synchronization signal can be shared by the narrowband terminal and the broadband terminal, so there is no need to provide separate synchronization signals for the narrowband terminal and the broadband terminal, thereby reducing resource overhead.

[0107] Optionally, the network device 20 in the embodiment of the present application is a device that connects the terminal device 30 to the wireless network. The network device 20 can be a node in a radio access network, which can also be called a base station or a radio access network (RAN) node (or device). For example, the network equipment may include a next generation node B (gNB) in a 5G system, or may also include a transmission reception point (TRP), a home base station (e.g., a home evolved NodeB, or a home Node B, HNB), a base band unit (BBU), a base band pool (BBU pool), or a WiFi access point (AP); or may also include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (CloudRAN) system; or may include equipment that implements base station functions in a non-terrestrial network (NTN), that is, it may be deployed on a high-altitude platform or a satellite. In the NTN, the network equipment may serve as a layer 1 (L1) relay, or as a base station, or as a distributed unit (DU), or as an integrated access and backhaul (IAT). Alternatively, it may include a device that implements a base station function in the IoT, such as a device that implements a base station function in a vehicle-to-everything (V2X), device-to-device (D2D), or machine-to-machine (M2M), but the embodiments of the present application are not limited thereto.

[0108] Optionally, the base station in the embodiment of the present application may include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, etc., and the embodiment of the present application does not make specific limitations on this.

[0109] Optionally, the network device 20 in the embodiment of the present application may also refer to a centralized unit (CU) or a distributed unit (DU), or the network device may be composed of a CU and a DU. Multiple DUs can share one CU. A DU can also be connected to multiple CUs. CU and DU can be understood as a division of the base station from a logical functional perspective. Among them, the CU and DU can be physically separated or deployed together, and the embodiment of the present application does not specifically limit this. The CU and DU can be connected through an interface, such as an F1 interface. The CU and DU can be divided according to the protocol layer of the wireless network. For example, the functions of the RRC protocol layer, the service data adaptation protocol stack (SDAP) protocol layer, and the packet data convergence protocol (PDCP) protocol layer are set in the CU, while the functions of the radio link control (RLC) protocol layer, the media access control (MAC) protocol layer, the physical (PHY) protocol layer, etc. are set in the DU.

[0110] It is understandable that the division of CU and DU processing functions according to this protocol layer is only an example, and they can also be divided in other ways.

[0111] Optionally, the terminal device 30 in the embodiment of the present application may be a device with a relatively small working bandwidth for implementing wireless communication functions, such as a terminal or a chip that can be used in a terminal. The terminal may be a user equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a terminal agent, or a terminal device in an NR network or a future evolved PLMN. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device or wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical care, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Alternatively, the terminal may be a terminal with communication capabilities in the IoT, such as a terminal in V2X (e.g., a vehicle-to-everything (V2X) device), a terminal in D2D communication, or a terminal in M2M communication. The terminal may be mobile or fixed.

[0112] Optionally, the network device 20 and the terminal device 30 in the embodiment of the present application can also be referred to as a communication device, which can be a general device or a dedicated device, and the embodiment of the present application does not make specific limitations on this.

[0113] Optional, such as Figure 6 , which is a schematic diagram of the structure of the network device 20 and the terminal device 30 provided in an embodiment of the present application.

[0114] The terminal device 30 includes at least one processor ( Figure 6 The exemplary embodiment includes a processor 301 as an example) and at least one transceiver ( Figure 6 Optionally, the terminal device 30 may further include at least one memory ( Figure 6 The example includes a memory 302 as an example), at least one output device ( Figure 6 The example includes an output device 304 as an example) and at least one input device ( Figure 6 The example is explained by taking an input device 305 as an example).

[0115] The processor 301, the memory 302 and the transceiver 303 are connected via a communication line. The communication line may include a path for transmitting information between the above components.

[0116] The processor 301 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. In a specific implementation, as an embodiment, the processor 301 may also include multiple CPUs, and the processor 301 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0117] The memory 302 may be a device having a storage function. For example, it may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 302 may exist independently and be connected to the processor 301 via a communication line. The memory 302 may also be integrated with the processor 301.

[0118] Optionally, the memory 302 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 301. Specifically, the processor 301 is used to execute the computer-executable instructions stored in the memory 302, thereby implementing the information sending and receiving method described in the embodiment of the present application.

[0119] Alternatively, optionally, in an embodiment of the present application, the processor 301 may also perform processing-related functions in the method provided in the following embodiments of the present application, and the transceiver 303 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiments of the present application.

[0120] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code or computer program code, which is not specifically limited in the embodiments of the present application.

[0121] The transceiver 303 can be any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access networks (RAN), or wireless local area networks (WLAN). The transceiver 303 includes a transmitter (Tx) and a receiver (Rx).

[0122] Output device 304 communicates with processor 301 and can display information in a variety of ways. For example, output device 304 can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector.

[0123] The input device 305 communicates with the processor 301 and can accept user input in various ways. For example, the input device 305 can be a mouse, keyboard, touch screen device, or sensor device.

[0124] The network device 20 includes at least one processor ( Figure 6 The exemplary embodiment includes a processor 201 as an example), and at least one transceiver ( Figure 6 The network device 20 may further include at least one memory ( Figure 6 The example includes a memory 202 as an example) and at least one network interface ( Figure 6The exemplary embodiment includes a network interface 204 as an example for explanation). The processor 201, the memory 202, the transceiver 203 and the network interface 204 are connected via a communication line. The network interface 204 is used to connect to the core network device via a link (such as an S1 interface), or to connect to the network interface of other network devices via a wired or wireless link (such as an X2 interface). Figure 6 In addition, the description of the processor 201, the memory 202 and the transceiver 203 can refer to the description of the processor 301, the memory 302 and the transceiver 303 in the terminal device 30, and will not be repeated here.

[0125] It is understandable that Figure 6 The illustrated structure does not constitute a specific limitation on the terminal device 30 or the network device 20. For example, in other embodiments of the present application, the terminal device 30 or the network device 20 may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0126] The following will be combined Figures 1 to 6 ,by Figure 5 Taking the interaction between the network device 20 shown and any terminal device 30 as an example, the information sending and receiving method provided in the embodiment of the present application is explained in detail.

[0127] It is understood that in the embodiments of the present application, the terminal device and / or the network device may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, the various steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all of the operations in the embodiments of the present application need to be performed.

[0128] It is understandable that in various embodiments of the present application, the interaction between the network device and the terminal device can also be applied to the interaction between the CU and the terminal device, or the interaction between the DU and the terminal device. It is understandable that the interaction mechanism between the network device and the terminal device in various embodiments of the present application can be appropriately modified to apply to the interaction between the CU or DU and the terminal device.

[0129] It should be noted that the message names between various devices or functions or the names of various parameters in the messages in the following embodiments of the present application are only examples. Other names may also be used in specific implementations, and the embodiments of the present application do not specifically limit this.

[0130] It should be noted that, in the following embodiments of the present application, unless otherwise specified, the terminal device refers to a narrowband terminal, which is uniformly described here and will not be repeated in the following embodiments.

[0131] It can be understood that the operating bandwidth of the broadband terminal in the following embodiments of the present application is greater than the operating bandwidth of the narrowband terminal. For example, the broadband terminal can be a smartphone in an existing 4G or 5G communication system, etc. The present application does not specifically limit the form of the broadband terminal.

[0132] It should be noted that in the following embodiments of the present application, "bandwidth" refers to the frequency domain bandwidth, and "occupied bandwidth" refers to the bandwidth occupied in the frequency domain. They are explained uniformly here and will not be repeated in the following embodiments.

[0133] like Figure 7 As shown, a method for sending and receiving information provided by the present application is applied to the aforementioned first communication system, and the method includes the following steps:

[0134] S701: A network device determines a synchronization signal, first information, and second information.

[0135] The synchronization signal includes the PSS and SSS. Optionally, the synchronization signal is shared by the broadband terminal and the narrowband terminal.

[0136] The first information is carried by the first PBCH. It is understood that, as described above, the first PBCH is the PBCH of the NRSSB. Therefore, the synchronization signal and the first PBCH carrying the first information constitute the NRSSB. In addition, the first information includes the MIB and the first payload. Of course, the first information may also include other information, which is not specifically limited in this application.

[0137] It should be noted that this application does not limit the information block consisting of the synchronization signal and the first PBCH carrying the first information to be called NR SSB or SSB. It can also have other names, and this application does not make specific limitations on the name.

[0138] The second information is carried by a second PBCH. The second PBCH is a PBCH for narrowband terminals. The second PBCH and the first PBCH are different PBCHs in the same communication system (the first communication system). The bandwidth occupied by the second PBCH is less than or equal to the bandwidth occupied by the first PBCH.

[0139] The second information is different from the first information. Optionally, the second information includes some or all parameters of the first information. Of course, the second information may also include parameters that are not present in the first information. It should be noted that when the second information and the first information include the same parameters, the values of the same parameters may be different.

[0140] That is, the network device can determine the NR SSB and the second information carried by the second PBCH. The NR SSB can be used for broadband terminals in the first communication system, and the synchronization signal of the NR SSB and the second information carried by the second PBCH are used for narrowband terminals in the first communication system. In some embodiments, part or all of the first information carried by the first PBCH is also used for narrowband terminals, which will be explained in subsequent embodiments and will not be repeated here.

[0141] It should be noted that the second PBCH in this application can also be called an additional PBCH, and the two can replace each other. This application does not make any specific restrictions on this.

[0142] Optionally, the synchronization signal, the first PBCH, and the second PBCH in this application can form an information block, or the synchronization signal and the second PBCH can form an information block. The information block can be understood as a new SSB that is different from the NR SSB, or it can have other names. This application does not make specific limitations on this.

[0143] S702: The network device sends a synchronization signal, first information, and second information. Correspondingly, the terminal device receives the synchronization signal, first information, and second information from the network device; or the terminal device receives the synchronization signal and second information from the network device.

[0144] It can be understood that the synchronization signal, the first information, and the second information are public information at the cell level. In step S702, it can be considered that the network device broadcasts the synchronization signal, the first information, and the second information, and the terminal device under the coverage of the network device can receive the information broadcast by the network device.

[0145] Among them, in step S702, the terminal device is a narrowband terminal, and the information broadcast by the network device received by the terminal device includes: the terminal device receives a synchronization signal from the network device, and obtains a cell identifier based on the synchronization signal, and then receives the first information and the second information based on the cell identifier, or receives the second information based on the cell identifier. This application does not specifically limit the method in which the terminal device obtains the cell identifier based on the synchronization signal and then receives the information carried by the PBCH based on the cell identifier. In one implementation method, it can be similar to the method in which a broadband terminal receives an NR SSB, which is not described here.

[0146] Optionally, when the working bandwidth of the terminal device is greater than or equal to the bandwidth occupied by the first PBCH, the terminal device receives the first information and the second information according to the cell identifier, that is, the terminal device receives the synchronization signal, the first information, and the second information; when the working bandwidth of the terminal device is less than the bandwidth occupied by the first PBCH, the terminal device receives the second information according to the cell identifier, that is, the terminal device receives the synchronization signal and the second information.

[0147] Optionally, after receiving the second information, or the first information and the second information, the terminal device can perform subsequent processing based on the received information, such as receiving SIB1 based on the first information or the second information, obtaining information required for random access, etc. This application does not make specific limitations on this.

[0148] Optionally, the broadband terminal in the first communication system can receive the synchronization signal and the first information carried by the first PBCH, or can receive the NR SSB to achieve downlink synchronization and network access in the broadband.

[0149] Based on this solution, in the first communication system, the network device sends a synchronization signal, first information, and second information, and the first information is carried by the first PBCH, and the second information is carried by the second PBCH. On the one hand, since the bandwidth occupied by the synchronization signal is relatively small, the working bandwidth of the narrowband terminal can include the bandwidth occupied by the synchronization signal, so the narrowband terminal can receive the synchronization signal. In addition, the narrowband terminal can receive the first PBCH and the second PBCH, or receive the second PBCH, according to its working bandwidth, thereby receiving the first information and the second information, or receiving the second information. Therefore, for the narrowband terminal, the present application can provide it with the synchronization signal and the information carried by the PBCH; on the other hand, the working bandwidth of the broadband terminal in the first communication system can also include the bandwidth occupied by the synchronization signal, so the broadband terminal can also receive the synchronization signal. In other words, the synchronization signal can be shared by the narrowband terminal and the broadband terminal, so there is no need to provide separate synchronization signals for the narrowband terminal and the broadband terminal, thereby reducing resource overhead.

[0150] The following describes the relevant features of the second information and the second PBCH under different operating bandwidths of the terminal device, which will be introduced from the following four aspects:

[0151] 1. The content of the second information;

[0152] 2. The time-frequency position of the second PBCH;

[0153] 3. Whether there is a notification mechanism for the second PBCH;

[0154] 4. Transmission mechanism of the second information.

[0155] The following first introduces the second information and the second PBCH when the working bandwidth of the terminal device is greater than or equal to the bandwidth occupied by the first PBCH (for example, the working bandwidth of the terminal device is 5 MHz).

[0156] The contents of the second information are as follows:

[0157] Since the working bandwidth of the terminal device is greater than the bandwidth occupied by the NR SSB, the terminal device can completely receive the first PBCH and obtain the MIB in the first information carried by the first PBCH. Figure 3 In the analysis of the scenario shown, if the PDCCH configuration, cell barring indication, or intra-frequency reselection indication for the MIB scheduling SIB1 in the first information is reused, the configuration flexibility of the network device and the demodulation performance of the PDCCH scheduling SIB1 will be affected, or the cell barring indication or intra-frequency reselection indication cannot be provided to narrowband terminals. Based on this, the second information can include at least one of the first sub-information, the second sub-information, the third sub-information, or the fourth sub-information.

[0158] For the first sub-information:

[0159] The first sub-information is used to schedule the first SIB1. In this case, the first sub-information may exemplarily include time-frequency resource location information, repetition count, modulation and coding scheme (MCS), redundancy version (RV), etc. of the first SIB1. Alternatively, the first sub-information is used to configure a first PDCCH, which is used to schedule the first SIB1. The first SIB1 may be understood as a SIB1 for narrowband terminals.

[0160] Optionally, when the first sub-information schedules the first SIB1, it can also be called scheduling information; when the first sub-information is used to configure the first PDCCH, it can also be called PDCCH configuration information for scheduling SIB1. They can be interchangeable, and this application does not make any specific restrictions on this.

[0161] For the second sub-information:

[0162] The second sub-information is used to indicate whether the cell corresponding to the second PBCH is a prohibited cell, or in other words, to indicate whether the narrowband terminal is allowed to access the cell corresponding to the second PBCH.

[0163] It should be noted that the second sub-information is not the same as the cell barring indication in the MIB of the first information. The cell barring indication in the MIB of the first information is used to indicate whether a broadband terminal (or an NR terminal) is allowed to access the cell corresponding to the first PBCH. The cell corresponding to the second PBCH and the cell corresponding to the first PBCH are the same cell, and the cell has two SIB1s, the first SIB1 and the second SIB1. The first SIB1 is used for narrowband terminals, and the second SIB1 is used for broadband terminals.

[0164] Optionally, the second sub-information may also be referred to as cell barring indication information, and the two may replace each other, which is not specifically limited in this application.

[0165] For the third child information:

[0166] The third sub-information is used to indicate whether to allow selection of a cell on the same frequency as a prohibited cell. Specifically, it can be used to indicate whether the terminal device is allowed to select a cell on the same frequency as the prohibited cell during cell selection or reselection when the highest-level cell is prohibited or deemed prohibited by the terminal device.

[0167] It should be noted that the third sub-information is not the same as the intra-frequency reselection indication in the MIB of the first information. The intra-frequency reselection indication in the MIB of the first information is used to indicate whether the broadband terminal is allowed to select the intra-frequency cell of the prohibited cell.

[0168] Optionally, the third sub-information may also be referred to as same-frequency reselection indication information, and the two may replace each other, which is not specifically limited in this application.

[0169] For the fourth child information:

[0170] The fourth sub-information is used to indicate whether the system information is updated.

[0171] Optionally, the fourth sub-information may include a value tag. When the network device sends system information, the system information will correspond to a value tag. After receiving the system information, the terminal device will store the system information and the value tag corresponding to the system information. When the system information changes, the value of the value tag will change, so that when the value of the value tag included in the fourth sub-information changes, the fourth sub-information can be used to indicate that the system information has been updated, and when the value of the value tag has not changed, the fourth sub-information can be used to indicate that the system information has not been updated. Thus, after receiving the fourth sub-information, the terminal device re-receives the updated system information when the value of the value tag changes compared to its previously stored value, and does not receive the system information when the value of the value tag has not changed compared to its previously stored value.

[0172] Based on this solution, when the fourth sub-information is used to indicate that the system information is updated, the terminal device receives the updated system information. When the fourth sub-information is used to indicate that the system information is not updated, the terminal device does not need to receive the system information, thereby reducing unnecessary reception of system information and saving power consumption of the terminal device.

[0173] Optionally, the fourth sub-information may also be referred to as system information change indication information, and the two may replace each other, and this application does not make any specific limitations on this.

[0174] Optionally, the first sub-information, the second sub-information, or the third sub-information may be understood as differentiated information from the first information, and the fourth sub-information may be understood as narrowband terminal-specific indication information.

[0175] Optionally, the second information does not include the system frame number of the frame where the synchronization signal is located, or the second information does not include N high-order bits of the system frame number, where N is a positive integer, for example, 6.

[0176] It should be noted that the synchronization signal, the first information, and the second information are located in the same frame. Therefore, the system frame number of the frame where the synchronization signal is located can also be called the system frame number of the frame where the first information or the second information is located.

[0177] It is understandable that since the terminal device can receive the first information, the first information includes the MIB. When the system frame number is included in the MIB, the system frame number may not be included in the second information. When the N high-order bits of the system frame number are included in the MIB, the N high-order bits of the system frame number may not be included in the second information. The terminal device can reuse the system frame number or the N high-order bits of the system frame number included in the MIB of the first information. In addition, the terminal device can also reuse the subcarrier spacing, subcarrier offset, DMRS position indication, etc. included in the MIB of the first information.

[0178] In summary, the second information can include differentiated information compared to the first information. Furthermore, there is no need to include information that is identical to the first information in the second information. The terminal device can reuse this identical information in the first information, thereby reducing signaling overhead. This does not affect the configuration flexibility of the network device or the demodulation performance of the second PDCCH, and can provide independent cell barring indications or same-frequency reselection indications for narrowband terminals.

[0179] The time-frequency position of the second PBCH is as follows:

[0180] In the following embodiments, the time-frequency position of the second PBCH will be described with reference to the SSB (i.e., NR SSB) composed of the synchronization signal and the first PBCH.

[0181] In one possible implementation, the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, and the time domain position of the second PBCH is the same as or included in the time domain position of the SSB. In other words, the OFDM symbols occupied by the second PBCH are part of or all of the OFDM symbols occupied by the SSB.

[0182] Optionally, the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, which can be: the frequency domain position of the second PBCH is located at a high frequency position and / or a low frequency position of the frequency domain position of the SSB.

[0183] For example, taking the time domain position of the second PBCH as the same as the time domain position of the SSB as an example, the frequency domain position of the second PBCH is located at the low frequency position, high frequency position, low frequency and high frequency position of the SSB as shown in the following diagrams respectively. Figure 8a 、 Figure 8b ,and Figure 8c As shown, the box filled with slashes represents the second PBCH.

[0184] Optionally, the relationship between the frequency domain position of the second PBCH and the frequency domain position of the SSB may be predefined by a protocol. In this case, the network device does not need to indicate the frequency domain position of the second PBCH to the terminal device, saving signaling overhead. Alternatively, the relationship between the frequency domain position of the second PBCH and the frequency domain position of the SSB may be determined by the network device. In this case, the network device may send indication information to the terminal device to indicate the frequency domain position of the second PBCH.

[0185] Optionally, the network device may include fifth sub-information in the first information or the second information, where the fifth sub-information is used to indicate that the frequency domain position of the second PBCH is located at a high frequency position and / or a low frequency position of the frequency domain position of the SSB. Accordingly, the terminal device receiving the second information based on the cell identifier may include: the terminal device determining the frequency domain position of the second PBCH based on the fifth sub-information, and receiving the second information at the frequency domain position of the second PBCH based on the cell identifier.

[0186] Optionally, when the fifth sub-information is included in the first information, the fifth sub-information may be represented by one idle bit in the MIB included in the first information. For example, when the value of the bit is "1", it indicates that the fifth sub-information indicates that the frequency domain position of the second PBCH is located at a high-frequency position of the frequency domain position of the SSB; when the value of the bit is "0", it indicates that the fifth sub-information indicates that the frequency domain position of the second PBCH is located at a low-frequency position of the frequency domain position of the SSB. Alternatively, when the value of the bit is "0", it indicates that the fifth sub-information indicates that the frequency domain position of the second PBCH is located at a high-frequency position of the frequency domain position of the SSB; when the value of the bit is "1", it indicates that the fifth sub-information indicates that the frequency domain position of the second PBCH is located at a low-frequency position of the frequency domain position of the SSB.

[0187] Alternatively, the fifth sub-information may be represented by two idle bits in the first payload included in the first information. The values of the two idle bits and the content indicated by the fifth sub-information may be as shown in Table 1 below.

[0188] Table 1

[0189] Idle bit value The content indicated by the fifth sub-information 00 none 01 The frequency domain position of the second PBCH is located at the low frequency position of the frequency domain position of the SSB 10 The frequency domain position of the second PBCH is located at the high frequency position of the frequency domain position of the SSB 11 The frequency domain position of the second PBCH is located at the low frequency position and high frequency position of the frequency domain position of the SSB

[0190] It is understandable that there may be other corresponding relationships between the values of the two idle bits and the content indicated by the fifth sub-information, which is not limited to Table 1, and this application does not make specific limitations on this.

[0191] Optionally, when the fifth sub-information is included in the second information, the network device and the terminal device may agree to assume that the frequency domain position of the second PBCH is adjacent to one side of the frequency domain position of the SSB (i.e., located at the high frequency position or low frequency position of the SSB) when the terminal device initially accesses, and the fifth sub-information included in the second information is carried by the part of the second PBCH located on the adjacent side. After the terminal device obtains the fifth sub-information on the adjacent side based on the assumption, if the fifth sub-information indicates that the frequency domain position of the second PBCH is adjacent to both sides of the frequency domain position of the SSB (i.e., located at the high frequency position and low frequency position of the SSB), the terminal device may receive the second information in a frequency hopping manner when subsequently receiving the second information to obtain frequency diversity gain.

[0192] Optionally, in some embodiments, the time-frequency position of the second PBCH in this implementation can also be described as: the frequency domain position of the second PBCH is adjacent to the frequency domain position of the first PBCH, and the time domain position of the second PBCH is the same as or included in the first time domain position, wherein the first time domain position includes the time domain position of the synchronization signal and the time domain position of the first PBCH. In this case, the relevant features of the time-frequency position of the second PBCH described above with reference to the SSB composed of the synchronization signal and the first PBCH can also be appropriately modified and applied to this description, and will not be repeated here.

[0193] Based on this possible implementation, the time domain position of the second PBCH is included in the time domain position of the SSB composed of the synchronization signal and the first PBCH, and the frequency domain position is adjacent to the frequency domain position of the SSB, so that the impact of the second PBCH on the energy-saving mechanism of the network device is reduced by frequency division multiplexing. Among them, the energy-saving mechanism of the network device means that when there is no business in the system, the network device can turn off other OFDM symbols except for the OFDM symbols occupied by public signals such as SSB that must be sent. That is, when there is no business in the system, the network device can not send anything on these OFDM symbols and turn off the RF module, thereby achieving the purpose of saving power consumption of the network device. In this implementation, the time domain position of the second PBCH is included in the time domain position of the NR SSB, which does not affect the network device's execution of OFDM symbol-level shutdown at time domain positions other than the SSB, that is, it does not affect the energy-saving mechanism of the network device.

[0194] In another possible implementation, the time domain position of the second PBCH is adjacent to the time domain position of the SSB (i.e., NR SSB) composed of the synchronization signal and the first PBCH, and the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB, or part of or all of the bandwidth occupied.

[0195] Optionally, the number of OFDM symbols occupied by the second PBCH is smaller than the number of OFDM symbols occupied by the SSB.

[0196] Optionally, the time domain position of the second PBCH being adjacent to the time domain position of the SSB may be: the time domain position of the second PBCH is located before and / or after the time domain position of the SSB.

[0197] For example, taking the frequency domain position of the second PBCH as the same as the frequency domain position of the SSB, and the second PBCH occupying 2 OFDM symbols as an example, the time domain position of the second PBCH is located before, after, before, and after the time domain position of the SSB as shown in the schematic diagrams respectively. Figure 9a 、 Figure 9b ,and Figure 9c As shown, the box filled with slashes represents the second PBCH.

[0198] Optionally, the determination of the relationship between the time domain position of the second PBCH and the time domain position of the SSB may have the following three situations:

[0199] Case 1: The relationship between the time domain position of the second PBCH and the time domain position of the SSB can be predefined by the protocol. In this case, the network device does not need to indicate the time domain position of the second PBCH to the terminal device, saving signaling overhead.

[0200] Case 2: The relationship between the time domain position of the second PBCH and the time domain position of the SSB can be determined by the network device. At this time, the network device can send indication information to the terminal device to indicate the time domain position of the second PBCH.

[0201] Optionally, the network device may include fifth sub-information in the first information, where the fifth sub-information is used to indicate that the time domain position of the second PBCH is before and / or after the time domain position of the SSB. Accordingly, the terminal device receiving the second information based on the cell identifier may include: the terminal device determining the time domain position of the second PBCH based on the fifth sub-information, and receiving the second information at the time domain position of the second PBCH based on the cell identifier.

[0202] Optionally, the fifth sub-information can be represented by 1 idle bit in the MIB included in the first information, or can be represented by 2 idle bits in the first payload included in the first information. Please refer to the relevant instructions for the fifth sub-information to indicate the frequency domain position of the second PBCH, which will not be repeated here.

[0203] Case 3: The relationship between the time domain position of the second PBCH and the time domain position of the SSB is related to the time domain position of the SSB.

[0204] Optionally, if there are idle time domain resources adjacent to the time domain position of the SSB before the time domain position of the SSB, the time domain position of the second PBCH is located before the time domain position of the SSB and is adjacent to the time domain position of the SSB; if there are idle time domain resources adjacent to the time domain position of the SSB after the time domain position of the SSB, the time domain position of the second PBCH is located after the time domain position of the SSB and is adjacent to the time domain position of the SSB; if there are idle time domain resources adjacent to the time domain position of the SSB both before and after the time domain position of the SSB, the time domain position of the second PBCH is located before and after the time domain position of the SSB and is adjacent to the time domain position of the SSB.

[0205] Optionally, in some embodiments, the time-frequency position of the second PBCH in this implementation can also be described as: the time domain position of the second PBCH is adjacent to the second time domain position, the second time domain position includes the time domain position of the synchronization signal and / or the time domain position of the first PBCH, and the frequency domain position of the second PBCH is the same as the frequency domain position of the first PBCH or is included in the frequency domain position of the first PBCH. In this case, the relevant features of the time-frequency position of the second PBCH described above with reference to the SSB composed of the synchronization signal and the first PBCH can also be appropriately modified and applied to this description, and will not be repeated here.

[0206] Based on this possible implementation method, the time domain position of the second PBCH is different from the time domain position of the SSB composed of the synchronization signal and the first PBCH, and the occupation of spectrum resources can be reduced through time division multiplexing.

[0207] The notification mechanism for whether the second PBCH exists is described as follows:

[0208] In one possible implementation, the terminal device may be explicitly notified through signaling that the second PBCH exists in the first communication system.

[0209] Optionally, the first information may include sixth sub-information, and the sixth sub-information may be used to indicate any one of the following:

[0210] There is a second PBCH in the first communication system;

[0211] The cell corresponding to the second PBCH is a non-barred cell;

[0212] There is a second PBCH in the first communication system, and the cell corresponding to the second PBCH is a non-barred cell.

[0213] It should be noted that, in the present application, the existence of the second PBCH is equivalent to the existence of the second information. Therefore, when the sixth sub-information is used to indicate the existence of the second PBCH in the first communication system, it is also equivalent to the sixth sub-information being used to indicate the existence of the second information in the first communication system, or in other words, the sixth sub-information is used to indicate that the network device has sent the second information carried by the second PBCH.

[0214] Optionally, the sixth sub-information is used to indicate that when the cell corresponding to the second PBCH is a non-barred cell, the narrowband terminal is allowed to access the cell corresponding to the second PBCH. In this case, the second information may not include the second sub-information, thereby saving signaling overhead occupied by the second sub-information.

[0215] Optionally, in this case, the terminal device receives the first information and the second information according to the cell identifier, which may include: the terminal device receives the first information according to the cell identifier, and then receives the second information according to the sixth sub-information included in the first information, that is, the terminal device may first receive the first information, and receive the second information when the sixth sub-information included in the first information indicates that there is a second PBCH in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell.

[0216] It can be understood that when the sixth sub-information is only used to indicate that the cell corresponding to the second PBCH is a non-prohibited cell, after the terminal device confirms that it is allowed to access the cell corresponding to the second PBCH based on the sixth sub-information, if the terminal device wants to access the cell, it needs to receive the second information first. At this time, it can also be considered that the terminal device receives the second information based on the sixth sub-information.

[0217] Optionally, in some implementation scenarios of the present application, a second PBCH may be defined in the protocol, but the second PBCH does not exist in the first communication system, or the network device does not send the second information. In this case, the sixth sub-information may be used to indicate any one of the following:

[0218] There is no second PBCH in the first communication system;

[0219] The cell corresponding to the second PBCH is a prohibited cell;

[0220] The second PBCH does not exist in the first communication system, and the cell corresponding to the second PBCH is a prohibited cell.

[0221] It should be noted that, in the present application, the absence of the second PBCH is equivalent to the absence of the second information. Therefore, when the sixth sub-information is used to indicate that the second PBCH does not exist in the first communication system, it is also equivalent to the sixth sub-information being used to indicate that the second information does not exist in the first communication system, or in other words, the sixth sub-information is used to indicate that the network device has not sent the second information carried by the second PBCH.

[0222] Optionally, the sixth sub-information is used to indicate that when the cell corresponding to the second PBCH is a prohibited cell, the narrowband terminal is prohibited from accessing the cell corresponding to the second PBCH. In this case, even if the network device sends the second information, the terminal device cannot access the cell. Therefore, in this case, the network device may not send the second information, and accordingly, the terminal device does not receive the second information, thereby saving signaling overhead.

[0223] Optionally, the reason why the second PBCH does not exist in the first system or the network device does not send the second information may be one or more of the following: for narrowband terminals, the cell corresponding to the second PBCH is under maintenance, and narrowband terminals are prohibited from accessing; the network device is highly loaded, and broadband terminals are prioritized, and narrowband terminals are prohibited from accessing. Of course, other reasons are possible, and this application does not specifically limit them.

[0224] Optionally, in this case, after the terminal device receives the first information according to the cell identifier, when the sixth sub-information indicates that there is no second PBCH in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell, the terminal device may not receive the second information to avoid waste of power consumption of the terminal device.

[0225] Optionally, the sixth sub-information may be represented by one idle bit in the MIB included in the first information. For example, when the value of this bit is "1", it indicates that the sixth sub-information indicates that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell. When the value of this bit is "0", it indicates that the sixth sub-information indicates that the second PBCH does not exist in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell.

[0226] Alternatively, the sixth sub-information may be represented by two idle bits in the first payload included in the first information. The values of the two idle bits and the content indicated by the sixth sub-information may be as shown in Table 2 below.

[0227] Table 2

[0228] Idle bit value Content indicated by the sixth sub-information 00 The second PBCH does not exist in the first communication system, and the cell corresponding to the second PBCH is a prohibited cell 01 The second PBCH does not exist in the first communication system 10 There is a second PBCH in the first communication system 11 There is a second PBCH in the first communication system, and the cell corresponding to the second PBCH is a non-prohibited cell

[0229] It is understandable that there may be other corresponding relationships between the values of the two idle bits and the content indicated by the sixth sub-information, which is not limited to Table 2, and this application does not make specific limitations on this.

[0230] Based on this solution, the terminal device receives the second information when the sixth sub-information indicates that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell; and does not receive the second information when the sixth sub-information indicates that the second PBCH does not exist in the first communication system and / or the cell corresponding to the second PBCH is a prohibited cell. The implementation on the network device side is more flexible. The terminal device can receive or not receive the second information based on the sixth sub-information, and can avoid blind reception when the network device does not send the second information, thereby reducing the power consumption of the terminal device.

[0231] In another possible implementation, the terminal device may be implicitly notified of the presence of the second PBCH in the first communication system.

[0232] Optionally, the first information may include seventh sub-information, where the seventh sub-information indicates the number of RBs occupied by the CORESET corresponding to the second PDCCH. When the number of RBs is greater than the first threshold, it indicates that the second PBCH exists in the first communication system.

[0233] Optionally, the bandwidth of the first threshold RBs is smaller than but close to the working bandwidth of the terminal device, for example, the first threshold may be 24; or, the bandwidth of the first threshold RBs is larger than the working bandwidth of the terminal device.

[0234] Optionally, the seventh sub-information may be configuration information of the PDCCH scheduling SIB1 carried by the pdcch-ConfigSIB1 field in the MIB included in the first information.

[0235] Optionally, in this case, the terminal device receives the first information and the second information according to the cell identifier, which may include: the terminal device receives the first information according to the cell identifier, and then determines the number of RBs occupied by the CORESET corresponding to the second PDCCH according to the seventh sub-information included in the first information; when the number of RBs is greater than the first threshold, it is determined that there is a second PBCH in the first communication system, and the second information is received.

[0236] Optionally, when the number of RBs occupied by the CORESET corresponding to the second PDCCH is less than or equal to the first threshold, the second PBCH may not exist in the first communication system, or the network device may not have the second information. At this time, the narrowband terminal and the broadband terminal share the synchronization signal and the first PBCH.

[0237] Based on this possible implementation method, the number of RBs occupied by the CORSET corresponding to the second PDCCH implicitly indicates whether there is a second PBCH in the system, which can reduce signaling overhead. At the same time, the terminal device can first determine whether there is a second PBCH, and will not receive the second information if it does not exist, thereby reducing the waste of terminal power consumption.

[0238] The transmission mechanism of the second information is described as follows:

[0239] In a possible implementation manner, before the network device sends the first information and the second information, the first information and the second information are encoded.

[0240] Optionally, the network device may encode the first information according to a first cyclic redundancy check (CRC) to obtain the encoded first information, and may encode the second information according to a second CRC to obtain the encoded second information, wherein the number of bits of the first CRC is different from the number of bits of the second CRC.

[0241] Optionally, the number of bits of the first CRC is greater than the number of bits of the second CRC. For example, the number of bits of the first CRC is 24, and the number of bits of the second CRC is 16. When the second information is encoded and modulated using the second CRC with a smaller number of bits, more bits can be used for the second information, that is, the second information can include more content or parameters.

[0242] Optionally, the network device encodes the first information according to the first CRC, which may include: the network device generates the first CRC, appends the first CRC after the transport block (TB) corresponding to the first information, encodes the TB corresponding to the first information and the first CRC, and obtains the encoded first information. Similarly, the network device encodes the second information according to the second CRC, which may include: the network device generates the second CRC, appends the second CRC after the TB corresponding to the second information, encodes the TB corresponding to the second information and the second CRC, and obtains the encoded second information.

[0243] It should be noted that the TB corresponding to the first information is the TB including the first information, and the TB corresponding to the second information is the TB including the second information.

[0244] Optionally, the network device may generate a first CRC based on a first CRC generation polynomial and generate a second CRC based on a second CRC generation polynomial. This application does not specifically limit the manner in which the network device generates a CRC.

[0245] Accordingly, in this implementation, the network device sending the first information and the second information may include: the network device sending the encoded first information and the encoded second information.

[0246] Optionally, in this implementation, the terminal device receives the first information and the second information according to the cell identifier, which may include: the terminal device receives the encoded first information and the encoded second information according to the cell identifier, and then performs a CRC check on the encoded first information according to the first CRC to obtain the first information, and performs a CRC check on the encoded second information according to the second CRC to obtain the second information.

[0247] Optionally, the terminal device performs a CRC check on the encoded first information according to the first CRC to obtain the first information, which may include: the terminal device decodes the encoded first information to obtain first decoded information containing the first CRC, and uses the first CRC to perform a CRC check on the first decoded information. After the check is successful, the first information is obtained according to the first decoded information. Similarly, the terminal device performs a CRC check on the encoded second information according to the second CRC to obtain the second information, which may include: the terminal device decodes the encoded second information to obtain second decoded information containing the second CRC, and uses the second CRC to perform a CRC check on the second decoded information. After the check is successful, the second information is obtained according to the second decoded information.

[0248] Optionally, the first CRC and second CRC used by the terminal device may be generated by the terminal device, wherein the first CRC generated by the terminal device is identical to the first CRC generated by the network device, and the second CRC generated by the terminal device is identical to the second CRC generated by the network device. Based on this possible implementation, the second information is coded and modulated using a CRC checksum, and the performance of the second PBCH is guaranteed by the CRC's strong error detection capability. In addition, the CRC system message is relatively small and simple to use, which can reduce the implementation complexity of the solution.

[0249] In another possible implementation manner, the second information may be represented by a sequence.

[0250] Optionally, the sequence representing the second information may be a long sequence occupying one or more OFDM symbols, or multiple short sequences, each short sequence occupying one OFDM symbol. Alternatively, the sequence representing the second information may be a product of different types of sequences.

[0251] It can be understood that the number of OFDM symbols occupied by the sequence representing the second information is less than or equal to the total number of OFDM symbols occupied by the first PBCH and the synchronization signal. Different sequences represent different second information.

[0252] Optionally, the long sequence or short sequence may be a Zadoff-Chu sequence, an m sequence, a gold sequence, etc. This application does not specifically limit the type of sequence.

[0253] Based on this possible implementation method, the second information carried by the second PBCH is represented by a sequence. The terminal device does not need to perform complex decoding operations when receiving the second information, but can perform simple correlation operations. Therefore, the processing complexity of the terminal device can be reduced, thereby reducing the requirements for the terminal device hardware and further reducing the cost of the terminal device.

[0254] The above is an introduction to the case where the working bandwidth of the terminal device is greater than the bandwidth occupied by the first PBCH. The following introduces the second information and the second PBCH when the working bandwidth of the terminal device is less than the bandwidth occupied by the first PBCH.

[0255] The contents of the second information are as follows:

[0256] Because the terminal device's operating bandwidth is smaller than the bandwidth occupied by the first PBCH, the terminal device cannot receive the first information carried by the first PBCH. Therefore, the second information includes parameters necessary for the terminal device to access the network device, namely, the system frame number of the frame containing the aforementioned synchronization signal or the N high-order bits of the system frame number. In addition, the second information may also include one or more of the aforementioned subcarrier spacing, subcarrier offset, DMRS position indication, first sub-information, second sub-information, third sub-information, and fourth sub-information.

[0257] Based on this solution, when the narrowband terminal is unable to receive the first information carried on the first PBCH, the second information includes the system frame number of the frame where the synchronization signal is located or the N high-order bits of the system frame number, so that the narrowband terminal can obtain the system frame number or its N high-order bits, and thus perform subsequent processing according to the system frame number or its N high-order bits, for example, receiving subsequent system information and paging messages, initiating random access, etc.

[0258] The time-frequency position of the second PBCH is as follows:

[0259] In the following embodiments, the time-frequency position of the second PBCH will be described with reference to the SSB (i.e., NR SSB) composed of the synchronization signal and the first PBCH.

[0260] In one possible implementation, the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, and the time domain position of the second PBCH is the same as the time domain position of the SSB, or is included in the time domain position of the SSB.

[0261] In another possible implementation, the time domain position of the second PBCH is adjacent to the time domain position of the SSB composed of the synchronization signal and the first PBCH, and the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB.

[0262] In which case, when the operating bandwidth of the terminal device is greater than the bandwidth occupied by the first PBCH, the time-frequency position description of the second PBCH may be appropriately modified to apply thereto. For example, the relationship between the time domain position or frequency domain position of the second PBCH and the time domain position or frequency domain position of the SSB composed of the synchronization signal and the first PBCH may be predefined by the protocol, or may be indicated by the network device to the terminal device. In this case, since the terminal device cannot receive the first information, the indication may be carried in other broadcast information sent before the second information is sent. This application does not make specific limitations on this.

[0263] The notification mechanism for whether the second PBCH exists is described as follows:

[0264] In one possible implementation, the terminal device may be explicitly notified of the presence of the second PBCH in the first communication system via signaling. Unlike when the operating bandwidth of the terminal device is greater than the first PBCH, the terminal device cannot receive the first information. Therefore, the signaling may be sent in other broadcast information sent before the second information is sent, and this application does not impose specific limitations on this.

[0265] In another possible implementation, the terminal device may be implicitly notified of the presence of the second PBCH in the first communication system. For details, see the above description of the case where the operating bandwidth of the terminal device is greater than the first PBCH, which will not be repeated here.

[0266] The transmission mechanism of the second information is described as follows:

[0267] Among them, the transmission mechanism of the second information is similar to the transmission mechanism of the second information when the working bandwidth of the terminal device is greater than the first PBCH. Please refer to the above related instructions and will not be repeated here.

[0268] In addition, in some implementation scenarios of the present application, regardless of whether the operating bandwidth of the terminal device is greater than the bandwidth of the first PBCH, the ratio between the energy per resource element (EPRE) of the second PBCH and the EPRE of the SSS included in the synchronization signal is X decibels (dB), where X is greater than or equal to 0. Based on this solution, since in the NR system, the SSS and the first PBCH have the same EPRE, that is, the ratio between the EPRE of the first PBCH and the EPRE of the SSS is 0 dB, when X is greater than 0, the EPRE of the second PBCH is greater than the EPRE of the first PBCH, that is, the transmit power of the second PBCH is higher, thereby achieving better coverage performance compared to the first PBCH.

[0269] In summary, in the first communication system, the network device sends a synchronization signal, first information, and second information, with the first information carried by the first PBCH and the second information carried by the second PBCH. A narrowband terminal can receive the first PBCH and the second PBCH, or the second PBCH, depending on its operating bandwidth, thereby receiving the first information and the second information, or the second information, for subsequent processing, such as downlink synchronization and initiating random access. Furthermore, a broadband terminal in the first communication system can receive the synchronization signal and the first information carried by the first PBCH to achieve synchronization and network access for the broadband terminal, thereby ensuring system integrity.

[0270] In the above method embodiment, the action of the network device can be Figure 6The processor 201 in the network device 20 shown calls the application code stored in the memory 202 to instruct the network device to execute; in the above method embodiment, the action of the terminal device can be performed by Figure 6 The processor 301 in the terminal device 30 shown calls the application code stored in the memory 302 to instruct the terminal device to execute, and this embodiment does not impose any limitation on this.

[0271] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0272] It can be understood that in the above embodiments, the methods and / or steps implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be used for the terminal device, and the methods and / or steps implemented by the network device can also be implemented by components that can be used for the network device.

[0273] The above description primarily describes the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. Accordingly, the embodiments of the present application also provide a communication device for implementing the various methods described above. The communication device can be a terminal device in the method embodiments described above, or a device including such a terminal device, or a component usable in a terminal device; or the communication device can be a network device in the method embodiments described above, or a device including such a network device, or a component usable in a network device. It will be understood that, to implement the aforementioned functions, the communication device includes hardware structures and / or software modules corresponding to the respective functions. Those skilled in the art will readily appreciate that, in conjunction with the various exemplary units and algorithm steps described in the embodiments disclosed herein, the present application can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Professionals may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0274] In the embodiment of the present application, the functional modules of the communication device can be divided according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0275] For example, the communication device is taken as the network device in the above method embodiment. Figure 10 1 shows a schematic diagram of the structure of a network device 100. The network device 100 includes a processing module 1001 and a transceiver module 1002. The transceiver module 1002, which may also be called a transceiver unit, is used to implement sending and / or receiving functions, and may be, for example, a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0276] Optionally, the network device 100 may further include a storage module ( Figure 10 ), for storing program instructions and data.

[0277] Optionally, the transceiver module 1002 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the network device in the above method embodiment; the processing module 1001 may be used to execute the processing steps (such as determination, acquisition, etc.) performed by the network device in the above method embodiment.

[0278] Among them, the processing module 1001 is used to determine the synchronization signal, the first information, and the second information, the first information is carried by the first PBCH, the second information is carried by the second PBCH, and the first information and the second information are different; the transceiver module 1002 is used to send the synchronization signal, the first information, and the second information.

[0279] Optionally, the processing module 1001 is also used to encode the first information according to the first CRC to obtain the encoded first information, and to encode the second information according to the second CRC to obtain the encoded second information, and the number of bits of the first CRC is different from the number of bits of the second CRC; the transceiver module 1002 is specifically used to send the encoded first information and the encoded second information.

[0280] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0281] In this embodiment, the network device 100 is presented in the form of various functional modules divided in an integrated manner. Here, "module" can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and / or other devices that can provide the above functions. In a simple embodiment, those skilled in the art can imagine that the network device 100 can be used Figure 6 The form of network device 20 is shown.

[0282] for example, Figure 6The processor 201 in the network device 20 shown can call the computer-executable instructions stored in the memory 202 to enable the network device 20 to execute the method in the above method embodiment.

[0283] Specifically, Figure 10 The functions / implementation processes of the processing module 1001 and the transceiver module 1002 can be realized by Figure 6 The processor 201 in the network device 20 shown calls the computer execution instructions stored in the memory 202 to implement. Or, Figure 10 The function / implementation process of the processing module 1001 can be achieved by Figure 6 The processor 201 in the network device 20 shown calls the computer execution instructions stored in the memory 202 to implement, Figure 10 The function / implementation process of the transceiver module 1002 can be achieved by Figure 6 The embodiment is implemented by the transceiver 203 in the network device 20 shown.

[0284] Since the network device 100 provided in this embodiment can execute the method in the above method embodiment, the technical effects that can be obtained can refer to the above method embodiment and will not be repeated here.

[0285] Or, for example, take the communication device as the terminal device in the above method embodiment. Figure 11 1 shows a schematic diagram of the structure of a terminal device 110. The terminal device 110 includes a processing module 1101 and a transceiver module 1102. The transceiver module 1102, which may also be called a transceiver unit, is used to implement the sending and / or receiving functions, and may be, for example, a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0286] Optionally, the terminal device 110 may further include a storage module ( Figure 11 ), for storing program instructions and data.

[0287] Optionally, the transceiver module 1102 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the terminal device in the above method embodiment; the processing module 1101 may be used to execute the processing steps (such as determination, acquisition, etc.) performed by the terminal device in the above method embodiment.

[0288] Among them, the transceiver module 1102 is used to receive a synchronization signal from a network device; the processing module 1101 is used to obtain a cell identifier based on the synchronization signal; the transceiver module 1102 is also used to receive first information and second information based on the cell identifier, or to receive second information based on the cell identifier, the first information is carried through the first PBCH, the second information is carried through the second PBCH, and the first information and the second information are different.

[0289] Optionally, the transceiver module 1102 is specifically used to receive the encoded first information and the encoded second information according to the cell identifier; the processing module 1101 is also used to perform a CRC check on the encoded first information according to the first CRC to obtain the first information, and to perform a CRC check on the encoded second information according to the second CRC to obtain the second information, and the number of bits of the first CRC is different from the number of bits of the second CRC.

[0290] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0291] In this embodiment, the terminal device 110 is presented in the form of various functional modules divided in an integrated manner. Here, "module" can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and / or other devices that can provide the above functions. In a simple embodiment, those skilled in the art can imagine that the terminal device 110 can be used Figure 6 The terminal device 30 is shown in the form.

[0292] for example, Figure 6 The processor 301 in the terminal device 30 shown can call the computer-executable instructions stored in the memory 302 to enable the terminal device 30 to execute the method in the above method embodiment.

[0293] Specifically, Figure 11 The functions / implementation processes of the processing module 1101 and the transceiver module 1102 can be realized by Figure 6 The processor 301 in the terminal device 30 shown calls the computer execution instructions stored in the memory 302 to implement. Or, Figure 11 The function / implementation process of the processing module 1101 can be achieved by Figure 6 The processor 301 in the terminal device 30 shown calls the computer execution instructions stored in the memory 302 to implement, Figure 11 The function / implementation process of the transceiver module 1102 can be achieved by Figure 6 It is implemented by the transceiver 303 in the terminal device 30 shown.

[0294] Since the terminal device 110 provided in this embodiment can execute the method in the above method embodiment, the technical effects that can be obtained can refer to the above method embodiment and will not be repeated here.

[0295] Optionally, an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), which includes a processor for implementing the method in any of the above method embodiments. In one possible design, the communication device also includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the above method embodiments. Of course, the memory may not be in the communication device. In another possible design, the communication device also includes an interface circuit, which is a code / data read / write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in the memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor. When the communication device is a chip system, it can be composed of a chip, or it can include chips and other discrete devices, and the embodiment of the present application does not specifically limit this.

[0296] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more media integrated therein. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)). In the embodiment of the present application, the computer may include the aforementioned device.

[0297] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and implement other changes to the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0298] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

Claims

1. A method for sending information, characterized in that: include: Determining a synchronization signal, first information, and second information, wherein the synchronization signal is shared by a wideband terminal and a narrowband terminal, the first information is carried by a first physical broadcast channel (PBCH), the second information is carried by a second PBCH, a bandwidth occupied by the second PBCH is smaller than a bandwidth occupied by the first PBCH, an operating bandwidth of the wideband terminal is greater than or equal to a bandwidth occupied by the first PBCH, and an operating bandwidth of the narrowband terminal is greater than or equal to a bandwidth occupied by the second PBCH; The synchronization signal, the first information, and the second information are sent.

2. The method according to claim 1, characterized in that The first information includes the system frame number of the frame in which the synchronization signal is located, and the second information does not include the system frame number; or The first information includes N high-order bits of the system frame number, and the second information does not include the N high-order bits of the system frame number, where N is a positive integer.

3. The method according to claim 1 or 2, characterized in that The second information includes at least one of the following: First sub-information, where the first sub-information is used to schedule a first system information block SIB1, or to configure a first physical downlink control channel PDCCH, where the first PDCCH is used to schedule the first SIB1; Second sub-information, where the second sub-information is used to indicate whether the cell corresponding to the second PBCH is a prohibited cell; third sub-information, where the third sub-information is used to indicate whether selection of a same-frequency cell as the prohibited cell is allowed; The fourth sub-information is used to indicate whether the system information is updated.

4. The method according to any one of claims 1 to 3, characterized in that The synchronization signal and the first PBCH constitute a synchronization signal / physical broadcast channel block SSB; The frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, and the time domain position of the second PBCH is the same as the time domain position of the SSB, or is included in the time domain position of the SSB; Alternatively, the time domain position of the second PBCH is adjacent to the time domain position of the SSB, and the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB.

5. The method according to claim 4, characterized in that The first information includes fifth sub-information; When the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, the fifth sub-information is used to indicate that the frequency domain position of the second PBCH is located at a high frequency position and / or a low frequency position of the frequency domain position of the SSB; When the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the fifth sub-information is used to indicate that the time domain position of the second PBCH is located before and / or after the time domain position of the SSB.

6. The method according to any one of claims 1 to 3, characterized in that The first information includes sixth sub-information, and the sixth sub-information is used to indicate that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell.

7. The method according to any one of claims 1 to 3, characterized in that The first information includes seventh sub-information, and the seventh sub-information indicates the number of resource blocks occupied by the control resource set CORESET corresponding to the second PDCCH. When the number is greater than the first threshold, the second PBCH exists in the first communication system, and the second PDCCH is used to schedule the second SIB1.

8. The method according to any one of claims 1 to 3, characterized in that The network device sending the first information and the second information includes: The network device encodes the first information according to a first cyclic redundancy check code (CRC) to obtain encoded first information, and encodes the second information according to a second CRC to obtain encoded second information, where the number of bits of the first CRC is different from the number of bits of the second CRC; The network device sends the encoded first information and the encoded second information.

9. The method according to any one of claims 1 to 3, characterized in that The second information is represented by a sequence.

10. The method according to any one of claims 1 to 3, characterized in that The synchronization signal includes a secondary synchronization signal SSS, and a ratio between the energy per resource element EPRE of the second PBCH and the EPRE of the SSS is X decibels, where X is greater than or equal to 0.

11. A method for receiving information, characterized in that: The method comprises: receiving a synchronization signal from a network device, wherein the synchronization signal is shared by a broadband terminal and a narrowband terminal; Acquiring a cell identifier according to the synchronization signal; The first information and the second information are received according to the cell identifier, or the second information is received according to the cell identifier, the first information is carried by a first physical broadcast channel PBCH, the second information is carried by a second PBCH, the bandwidth occupied by the second PBCH is smaller than the bandwidth occupied by the first PBCH, the working bandwidth of the broadband terminal is greater than or equal to the bandwidth occupied by the first PBCH, and the working bandwidth of the narrowband terminal is greater than or equal to the bandwidth occupied by the second PBCH.

12. The method according to claim 11, characterized in that The method is applied to a narrowband terminal, and the receiving of the first information and the second information according to the cell identifier, or the receiving of the second information according to the cell identifier, includes: When the operating bandwidth of the narrowband terminal is greater than or equal to the bandwidth occupied by the first PBCH, receiving the first information and the second information according to the cell identifier; or When the operating bandwidth of the narrowband terminal is smaller than the bandwidth occupied by the first PBCH, the second information is received according to the cell identifier.

13. The method according to claim 11 or 12, characterized in that The first information includes the system frame number of the frame in which the synchronization signal is located, and the second information does not include the system frame number; or, the first information includes N high bits of the system frame number, and the second information does not include N high bits of the system frame number, where N is a positive integer.

14. The method according to claim 13, characterized in that The second information includes at least one of the following: First sub-information, where the first sub-information is used to schedule a first system information block SIB1, or to configure a first physical downlink control channel PDCCH, where the first PDCCH is used to schedule the first SIB1; Second sub-information, where the second sub-information is used to indicate whether the cell corresponding to the second PBCH is a prohibited cell; third sub-information, where the third sub-information is used to indicate whether selection of a same-frequency cell as the prohibited cell is allowed; The fourth sub-information is used to indicate whether the system information is updated.

15. The method according to any one of claims 11 to 14, characterized in that: The synchronization signal and the first PBCH constitute a synchronization signal / physical broadcast channel block SSB; The frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, and the time domain position of the second PBCH is the same as the time domain position of the SSB, or is included in the time domain position of the SSB; Alternatively, the time domain position of the second PBCH is adjacent to the time domain position of the SSB, and the frequency domain position of the second PBCH is the same as the frequency domain position of the SSB, or is included in the frequency domain position of the SSB.

16. The method according to claim 15, characterized in that The first information includes fifth sub-information; When the frequency domain position of the second PBCH is adjacent to the frequency domain position of the SSB, the fifth sub-information is used to indicate that the frequency domain position of the second PBCH is located at a high frequency position and / or a low frequency position of the frequency domain position of the SSB; When the time domain position of the second PBCH is adjacent to the time domain position of the SSB, the fifth sub-information is used to indicate that the time domain position of the second PBCH is located before and / or after the time domain position of the SSB.

17. The method according to any one of claims 11 to 14, characterized in that The first information includes sixth sub-information, and the sixth sub-information is used to indicate that the second PBCH exists in the first communication system and / or the cell corresponding to the second PBCH is a non-prohibited cell.

18. The method according to any one of claims 11 to 14, characterized in that: The first information includes seventh sub-information, and the seventh sub-information indicates the number of resource blocks occupied by the control resource set CORESET corresponding to the second PDCCH. When the number is greater than the first threshold, the second PBCH exists in the first communication system, and the second PDCCH is used to schedule the second SIB1.

19. The method according to any one of claims 11 to 14, characterized in that: The receiving the first information and the second information according to the cell identifier includes: The terminal device receives the encoded first information and the encoded second information according to the cell identifier; The terminal device performs a CRC check on the encoded first information according to a first cyclic redundancy check code CRC to obtain the first information, and performs a CRC check on the encoded second information according to a second CRC to obtain the second information, wherein the number of bits of the first CRC is different from the number of bits of the second CRC.

20. The method according to any one of claims 11 to 14, characterized in that The second information is represented by a sequence.

21. The method according to any one of claims 11 to 14, characterized in that The synchronization signal includes a secondary synchronization signal SSS, and a ratio between the energy per resource element EPRE of the second PBCH and the EPRE of the SSS is X decibels, where X is greater than or equal to 0.

22. A communication device, characterized in that: The method comprises a module for executing the method according to any one of claims 1 to 10, or a module for executing the method according to any one of claims 11 to 21.

23. A communication device, characterized in that: The communication device includes: a processor, wherein the processor is configured to execute the computer program or instruction, so that the communication device performs the method according to any one of claims 1 to 10, or the communication device performs the method according to any one of claims 11 to 21.

24. A computer-readable storage medium, characterized in that The method comprises a computer program or an instruction, which, when executed on a communication device, causes the communication device to execute the method according to any one of claims 1 to 10, or causes the communication device to execute the method according to any one of claims 11 to 21.

25. A computer program product, characterized in that The method comprises a computer program or an instruction, which, when executed on a communication device, causes the communication device to execute the method according to any one of claims 1 to 10, or causes the communication device to execute the method according to any one of claims 11 to 21.

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