Communication method and apparatus

Abstract

The application relates to a communication method and device, belonging to the field of communication. The method can reduce the bit number carried by a physical broadcast channel message by carrying part of bits of system frame number information in the physical broadcast channel message, thereby reducing the configuration overhead of random access of a terminal device. In addition, the bit number carried by the physical broadcast channel message is reduced, so that the physical broadcast channel message can be sent on a narrower frequency band, and a terminal device with limited bandwidth can receive the physical broadcast channel message on the narrower frequency band. Therefore, the scheme is helpful for random access configuration of a terminal device with limited bandwidth.

Description

Technical Field

[0001] This application relates to the field of communications, and more specifically, to a communication method and apparatus. Background Technology

[0002] The primary goal of initial access (IA) is to allocate necessary communication resources and establish a reliable communication link for a terminal device when it first accesses or re-accesses the network. The random access procedure is particularly important during initial access. Random access can be used to resolve the time-frequency synchronization problem between the terminal device and network devices (i.e., uplink synchronization) and to allocate uplink resources to the terminal device for further communication.

[0003] However, how to reduce the configuration overhead of terminal devices for random access is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a communication method and apparatus that can reduce the configuration overhead of terminal devices performing random access.

[0005] Firstly, a communication method is provided. The method provided in the first aspect can be executed by a first device. Unless otherwise specified, the first device in this application can be a communication device (e.g., a terminal device), a component within the communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description assumes the first device is a terminal device.

[0006] The method includes: receiving a physical broadcast channel message, wherein the physical broadcast channel message includes a first portion of system frame number information bits; and performing random access based on the first portion of bits.

[0007] As an example, system frame number information can include M bits, where M is a positive integer. The M bits can be understood as all the bits in the system frame number information. Taking the new radio (NR) system as an example, the system frame number information can include M = 10 bits. 10 bits can identify 0 to 1023, a total of 1024 system frame numbers.

[0008] As an example, the first set of bits can be P bits, where P is a positive integer less than M. Taking the NR system as an example, the first set of bits (i.e., P bits) can be a portion of the M = 10 bits of the system frame number information, where P is less than 10.

[0009] In some examples, the first part of the bits may include one or more bits of the least significant bit in the system frame number information. For example, the first part of the bits may be P bits of the least significant bit (LSB) of the M-bit information (i.e., the system frame number information).

[0010] Compared to the traditional approach of carrying all bits (i.e., M bits) of system frame number information in the physical broadcast channel message, the method provided in the first aspect reduces the number of bits carried in the physical broadcast channel message by carrying only a portion (i.e., P bits) of the system frame number information, thereby reducing the configuration overhead for random access by the terminal device. Furthermore, by reducing the number of bits carried in the physical broadcast channel message, the above approach allows the physical broadcast channel message to be transmitted on a narrower frequency band, enabling bandwidth-constrained terminal devices to receive the physical broadcast channel message on a narrower frequency band they support.

[0011] In some implementations, the method further includes: receiving first information, the first information including a second part of the system frame number information bits, the first information being carried on at least one of the following signaling: control information of a system information block, a system information block, control information of a random access response, a random access response, control information of a radio resource control connection confirmation message, or a radio resource control connection confirmation message.

[0012] As an example, the second part of the bits can be the MP bits other than the first part of the bits (i.e., P bits) in the system frame number information (i.e., M bits). Taking the NR system as an example, the system frame number information can include M = 10 bits. The second part of the bits can be any of the aforementioned 10 bits except for the P bits, that is, the second part of the bits can be 10 - P bits.

[0013] The above scheme uses the second part of the system frame number information (e.g., the remaining bits of the system frame number information excluding the first part) to indicate the first part of the system frame number information, enabling the terminal device to obtain the complete system frame number information and proceed with subsequent processes. As an example, the terminal device can achieve complete frame synchronization with the network device based on the complete system frame number information. For instance, in an NR system, the terminal device can synchronize with the network device for 1024 radio frames based on 10 bits of system frame number information. Thus, the terminal device can send messages to or receive messages from the network device on specific radio frames configured by the network device. For example, the terminal device can receive paging messages from the network device on radio frames indicated by the paging configuration.

[0014] In some implementations, the first information is carried in the control information of the system information block and / or the system information block; wherein, random access includes: sending a preamble based on the first part of bits and the second part of bits.

[0015] The above scheme enables the terminal device to obtain complete system frame number information by using the control information of the system information block and / or the second part of the system frame number information indicated by the system information block (e.g., the remaining bits of the system frame number information excluding the first part of the bits). Based on the complete system frame number information, the terminal device can find the random access resource for transmitting the preamble, and thus transmit the preamble.

[0016] In some implementations, the first portion of bits is P bits, where P is a positive integer; wherein, before performing random access, the method further includes: receiving second information, the second information being used to indicate a first random access period, wherein the number of radio frames in the first random access period is less than or equal to 2. P The random access process includes sending a preamble during the first random access period.

[0017] The above scheme limits the length of the random access period indicated by the network device to 2. P Within this timeframe, the terminal device can determine the random access resource for sending the preamble and send the preamble within the random access period. Even when the terminal device has not obtained complete system frame number information, the above scheme enables the terminal device to send the preamble.

[0018] In some implementations, the first portion of bits is P bits, where P is a positive integer; wherein, before performing random access, the method further includes: receiving third information, which indicates a second random access period, a first offset, and a second offset, wherein the difference between the first offset and the second offset is 2. P The random access includes sending a preamble on the first frame and the second frame in the second random period, respectively, wherein the offset of the first frame in the second random access period is the first offset, and the offset of the second frame in the second random access period is the second offset.

[0019] Based on the above scheme, the terminal device can access the device at 2 during the random access period. P Using radio frames as intervals, multiple random access resources are determined for transmitting the preamble, and the preamble is then transmitted. This scheme enables the terminal device to transmit the preamble even when it has not obtained complete system frame number information.

[0020] In some implementations, the method is applied to a first terminal, where the first part of the bits is P bits, and P is a positive integer. After random access is performed, the method further includes: receiving control information of a random access response, wherein the control information of the random access response includes indication information of a first system frame number period, where the number of radio frames in the first system frame number period is equal to 2. P When the first system frame number period is the same as the system frame number period in which the first terminal sends the preamble, the random access response is received.

[0021] Based on the above scheme, the control information of the random access response can instruct a terminal device to send the first system frame number period of the preamble. In this way, by determining whether the first system frame number period is the same as the system frame number period for which the first terminal sends the preamble, the first terminal can identify whether the control information of the random access response is its own control information, thereby determining whether to receive the random access response scheduled by the control information. Compared to the scheme that instructs a terminal device to send a radio frame containing the preamble, the above implementation, by instructing a terminal device to send the first system frame number period of the preamble, can enable multiple terminal devices to identify whether the control information of the random access response is intended for themselves, even with a large random access response window, using fewer bits.

[0022] In some implementations, the indication information of the first system frame number period is used to indicate a third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

[0023] The above scheme can save signaling overhead by indicating the first system frame number period with a small number of bits.

[0024] In some implementations, the method further includes: receiving fourth information, which is control information for instructing a terminal that transmits a preamble in a third random access period to use a first frequency domain resource to monitor the random access response, and control information for instructing a terminal that transmits a preamble in a fourth random access period to use a second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

[0025] By configuring the fourth information, terminal devices sending preambles in different random access periods can use different frequency domain resources to monitor the control information of the random access response. Correspondingly, when a network device sends control information for a random access response to a terminal device sending a preamble in a certain random access period, it can use the corresponding frequency domain resources; different random access periods correspond to different frequency domain resources. Thus, even if the time domain unit of the actual random access response control information falls within the random access response windows of two terminal devices simultaneously, because these two terminal devices use different frequency domain resources to monitor the random access response control information, they can identify the control information of the random access response sent to themselves.

[0026] In some implementations, the physical broadcast channel message is received within a first frequency band, the width of which is the frequency band width supported by a first type of terminal, and the frequency band width supported by the first type of terminal is smaller than the frequency band width supported by a second type of terminal.

[0027] By restricting the physical broadcast channel message to the first frequency band, both type 1 and type 2 terminals can receive and parse the message, thus achieving unified configuration for bandwidth-limited type 1 terminals and bandwidth-unlimited type 2 terminals. Furthermore, the physical broadcast channel message carries a portion of the system frame number information; due to its smaller bit count, it can be transmitted within the bandwidth-limited first frequency band.

[0028] Secondly, a communication method is provided. The method provided in this application can be executed by a second device. Unless otherwise specified, the second device in this application can be a communication device (e.g., a network device, or more specifically, an access network device), a component within a communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description uses a network device as an example.

[0029] The method includes: generating a physical broadcast channel message, wherein the physical broadcast channel message includes a first portion of system frame number information bits; and sending the physical broadcast channel message.

[0030] In some implementations, the system frame number information has M bits, where M is a positive integer, and the first part of the bits has P bits, where P is a positive integer less than M.

[0031] In some implementations, the method further includes: sending first information, which includes a second portion of the system frame number information bits, the first information being carried on at least one of the following signaling: control information of a system information block, a system information block, control information of a random access response, a random access response, control information of a radio resource control connection confirmation message, or a radio resource control connection confirmation message.

[0032] In some implementations, the first portion of bits is P bits, where P is a positive integer; the method further includes: sending second information, which indicates a first random access period in which the number of radio frames is less than or equal to 2. P .

[0033] In some implementations, the first part of the bits is P bits, where P is a positive integer; the method further includes: sending third information, which indicates a second random access period, a first offset, and a second offset, wherein the difference between the first offset and the second offset is 2. P In this second random period, both the first frame and the second frame are used to send a preamble. The offset of the first frame in the second random access period is the first offset, and the offset of the second frame in the second random access period is the second offset.

[0034] In some implementations, the first part of bits is P bits, where P is a positive integer. The method further includes: sending control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P The random access response is sent to a first terminal, which is the terminal that sends the preamble within the first system frame number period.

[0035] In some implementations, the indication information of the first system frame number period is used to indicate a third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

[0036] In some implementations, the method further includes: sending fourth information, which is control information for instructing a terminal that sends a preamble in a third random access period to use a first frequency domain resource to monitor the random access response, and control information for instructing a terminal that sends a preamble in a fourth random access period to use a second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

[0037] In some implementations, the physical broadcast channel message is transmitted within a first frequency band, the width of which is the frequency band width supported by a first type of terminal, and the frequency band width supported by the first type of terminal is smaller than the frequency band width supported by a second type of terminal.

[0038] The beneficial effects of the second aspect and any implementation thereof are as described above, and will not be repeated here.

[0039] Thirdly, a communication method is provided. The method provided in this third aspect can be executed by a first device. Unless otherwise specified, the first device in this application can be a communication device (e.g., a terminal device), a component within the communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description will use a first terminal as an example.

[0040] The method includes: receiving a physical broadcast channel message, wherein the physical broadcast channel message includes P bits, where P is a positive integer, and the P bits are part of the system frame number information; and receiving control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P When the first system frame number period is the same as the system frame number period in which the first terminal sends the preamble, the random access response is received.

[0041] Based on the above scheme, the control information of the random access response can instruct a terminal device to send the first system frame number period of the preamble. In this way, by determining whether the first system frame number period is the same as the system frame number period for which the first terminal sends the preamble, the first terminal can identify whether the control information of the random access response is its own control information, thereby determining whether to receive the random access response scheduled by the control information. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the third aspect described above, by instructing a terminal device to send the first system frame number period of the preamble, can enable multiple terminal devices to identify whether the control information of the random access response is intended for themselves, even with a large random access response window, using fewer bits.

[0042] In some implementations, the indication information of the first system frame number period is used to indicate a third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

[0043] The above scheme can save signaling overhead by indicating the first system frame number period with a small number of bits.

[0044] Fourthly, a communication method is provided. The method provided in this application can be executed by a second device. Unless otherwise specified, the second device in this application can be a communication device (e.g., a network device, or more specifically, an access network device), a component within a communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description uses a network device as an example.

[0045] The method includes: sending a physical broadcast channel message, wherein the physical broadcast channel message includes P bits, where P is a positive integer, and the P bits are part of the system frame number information; and sending control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P The random access response is sent to a first terminal, which is the terminal that sends the preamble within the first system frame number period.

[0046] In some implementations, the indication information of the first system frame number period is used to indicate a third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

[0047] The beneficial effects of the fourth aspect and any implementation thereof are similar to those of the third aspect and any implementation thereof, and will not be repeated here.

[0048] Fifthly, a communication method is provided. The method provided in the fifth aspect can be executed by a first device. Unless otherwise specified, the first device in this application can be a communication device (e.g., a terminal device), a component within the communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description assumes the first device is a first terminal.

[0049] The method includes: receiving control information of a random access response, wherein the control information of the random access response includes indication information of a fifth random access period; and receiving the random access response when the fifth random access period is a random access period in which the first terminal sends a preamble.

[0050] Based on the above scheme, the control information of the random access response can instruct a terminal device to send the fifth random access period of the preamble. In this way, by determining whether the fifth random access period is the random access period in which the first terminal sends the preamble, it can identify whether the control information of the random access response is its own control information, thereby determining whether to receive the random access response scheduled by the control information. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the fifth aspect described above, by instructing a terminal device to send the fifth random access period of the preamble, can enable multiple terminal devices to identify whether the control information of the random access response is intended for itself, even with a large random access response window, using fewer bits.

[0051] In some implementations, the indication information of the fifth random access period is used to indicate a fourth offset, which indicates the offset between the fifth random access period and the random access period that sends the control information for the random access response.

[0052] The above scheme can save signaling overhead by indicating the fifth random access period with a small number of bits.

[0053] Sixthly, a communication method is provided. The method provided in the sixth aspect can be executed by a second device. Unless otherwise specified, the second device in this application can be a communication device (e.g., a network device, or more specifically, an access network device), a component within a communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description uses a network device as an example.

[0054] The method includes: sending control information for a random access response, wherein the control information for the random access response includes indication information for a fifth random access period; and sending the random access response to a first terminal, the first terminal being a terminal that sends a preamble during the fifth random access period.

[0055] In some implementations, the indication information of the fifth random access period is used to indicate a fourth offset, which indicates the offset between the fifth random access period and the random access period that sends the control information for the random access response.

[0056] The beneficial effects of the sixth aspect and any implementation thereof are similar to those of the fifth aspect and any implementation thereof, and will not be repeated hereafter.

[0057] In a seventh aspect, a communication device is provided, including a processing circuit (or processor) and an input / output interface (also referred to as an interface circuit), the input / output interface being used for inputting and / or outputting signals, and the processing circuit being used to execute any one of the first to sixth aspects, or any possible implementation of any one of the first to sixth aspects.

[0058] In some implementations, the processing circuitry is used to communicate with other devices via interface circuitry and to execute any of the first to sixth aspects, or any possible implementation of any of the first to sixth aspects.

[0059] Eighthly, a communication device is provided. This communication device may include units, modules, or means for performing the functions of the communication device.

[0060] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the first aspect and any possible implementation of the first aspect. These modules, units, or means may be hardware circuits, software, or a combination of hardware circuits and software.

[0061] For example, the apparatus includes a transceiver unit. The transceiver unit is configured to receive a physical broadcast channel message, wherein the physical broadcast channel message includes a first portion of system frame number information bits; the transceiver unit is also configured to perform random access based on the first portion of bits.

[0062] In some implementations, the transceiver unit is further configured to: receive first information, the first information including a second part of the system frame number information bits, the first information being carried on at least one of the following signaling: control information of a system information block, a system information block, control information of a random access response, a random access response, control information of a radio resource control connection confirmation message, or a radio resource control connection confirmation message.

[0063] In some implementations, the first information is carried in the control information of the system information block and / or the system information block; wherein, the transceiver unit is specifically used to: send a preamble based on the first part of the bits and the second part of the bits.

[0064] In some implementations, the first part of the bits is P bits, where P is a positive integer; wherein, the transceiver unit is further configured to: receive second information, the second information being used to indicate a first random access period, wherein the number of radio frames in the first random access period is less than or equal to 2. P Specifically, the transceiver unit is used to send a preamble during the first random access period.

[0065] In some implementations, the first part of the bits is P bits, where P is a positive integer; wherein, the transceiver unit is further configured to: receive third information, the third information being used to indicate a second random access period, a first offset, and a second offset, the difference between the first offset and the second offset being 2. P Specifically, the transceiver unit is used to transmit preambles on the first frame and the second frame in the second random access period, respectively. The offset of the first frame in the second random access period is the first offset, and the offset of the second frame in the second random access period is the second offset.

[0066] In some implementations, the device is applied to a first terminal, where the first part of the bits is P bits, where P is a positive integer. The transceiver unit is further configured to: receive control information of a random access response, wherein the control information of the random access response includes indication information of a first system frame number period, where the number of radio frames in the first system frame number period is equal to 2. P When the first system frame number period is the same as the system frame number period in which the first terminal sends the preamble, the random access response is received.

[0067] In some implementations, the transceiver unit is further configured to: receive fourth information, which is control information for instructing a terminal that transmits a preamble in a third random access period to use a first frequency domain resource to monitor the random access response, and control information for instructing a terminal that transmits a preamble in a fourth random access period to use a second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

[0068] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the second aspect and any possible implementation of the second aspect, which may be hardware circuits, software, or a combination of hardware circuits and software.

[0069] For example, the apparatus includes a transceiver unit and a processing unit. The processing unit is used to generate a physical broadcast channel message, wherein the physical broadcast channel message includes a first portion of system frame number information bits; the transceiver unit is used to transmit the physical broadcast channel message.

[0070] In some implementations, the transceiver unit is further configured to: transmit first information, the first information including a second part of the system frame number information bits, the first information being carried on at least one of the following signaling: control information of a system information block, a system information block, control information of a random access response, a random access response, control information of a radio resource control connection confirmation message, or a radio resource control connection confirmation message.

[0071] In some implementations, the first part of the bits is P bits, where P is a positive integer; wherein, the transceiver unit is further configured to: transmit second information, the second information being used to indicate a first random access period, wherein the number of radio frames in the first random access period is less than or equal to 2. P .

[0072] In some implementations, the first part of the bits is P bits, where P is a positive integer; wherein, the transceiver unit is further configured to: transmit third information, which indicates a second random access period, a first offset, and a second offset, wherein the difference between the first offset and the second offset is 2. P In this second random period, both the first frame and the second frame are used to send a preamble. The offset of the first frame in the second random access period is the first offset, and the offset of the second frame in the second random access period is the second offset.

[0073] In some implementations, the first part of the bits is P bits, where P is a positive integer. The transceiver unit is further configured to: transmit control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, where the number of radio frames in the first system frame number period is equal to 2. P The random access response is sent to a first terminal, which is the terminal that sends the preamble within the first system frame number period.

[0074] In some implementations, the transceiver unit is further configured to: transmit fourth information, which is control information for instructing a terminal that transmits a preamble in a third random access period to use a first frequency domain resource to monitor the random access response, and control information for instructing a terminal that transmits a preamble in a fourth random access period to use a second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

[0075] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the third aspect and any possible implementation of the third aspect, which may be hardware circuits, software, or a combination of hardware circuits and software.

[0076] For example, the device includes a transceiver unit. The transceiver unit can be configured to: receive a physical broadcast channel message, wherein the physical broadcast channel message includes P bits, where P is a positive integer, and the P bits are part of system frame number information; and receive control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. PWhen the first system frame number period is the same as the system frame number period in which the first terminal sends the preamble, the random access response is received.

[0077] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the fourth aspect and any possible implementation of the fourth aspect, which may be hardware circuits, software, or a combination of hardware circuits and software.

[0078] For example, the device includes a transceiver unit. The transceiver unit can be used to: transmit a physical broadcast channel message, wherein the physical broadcast channel message includes P bits, where P is a positive integer, and the P bits are part of system frame number information; and transmit control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P The random access response is sent to a first terminal, which is the terminal that sends the preamble within the first system frame number period.

[0079] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the fifth aspect and any possible implementation of the fifth aspect, which may be hardware circuits, software, or a combination of hardware circuits and software.

[0080] For example, the device includes a transceiver unit. The transceiver unit can be used to: receive control information of a random access response, wherein the control information of the random access response includes indication information of a fifth random access period; and, if the fifth random access period is a random access period in which the first terminal sends a preamble, receive the random access response.

[0081] In some implementations, the communication device may include modules, units, or means for performing the methods / operations / steps / actions described in the sixth aspect and any possible implementation of the sixth aspect, which may be hardware circuits, software, or a combination of hardware circuits and software.

[0082] For example, the device includes a transceiver unit. The transceiver unit can be used to: transmit control information for a random access response, wherein the control information for the random access response includes indication information for a fifth random access period; and transmit the random access response to a first terminal, the first terminal being a terminal that transmits a preamble during the fifth random access period.

[0083] Ninthly, a computer-readable storage medium is provided that stores a computer program or instructions that, when executed, cause any one of the first to sixth aspects, or any possible implementation of any one of the first to sixth aspects, to be executed (or implemented).

[0084] In a tenth aspect, a computer program product is provided, comprising a computer program or instructions that, when executed, cause any one of the first to sixth aspects, or any possible implementation of any one of the first to sixth aspects, to be executed (or implemented).

[0085] Eleventhly, a communication device is provided, comprising a processor for executing (or implementing) any of the first to sixth aspects, or any possible implementation of any of the first to sixth aspects, by executing a computer program (or computer-executable instructions) stored in a memory, and / or by logic circuitry.

[0086] In one possible implementation, the device also includes a memory. In another possible implementation, the processor and memory are integrated together. In yet another possible implementation, the memory is located outside the device. The processor may include one or more processors.

[0087] In some possible implementations, the memory may be used to store part or all of the necessary computer program or instructions for implementing any of the first to sixth aspects, or for any possible implementation of any of the first to sixth aspects, to provide the functionality.

[0088] In one possible implementation, the communication device further includes a communication interface for communicating with other devices, such as transmitting or receiving data and / or signals. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, input / output interface, or other types of communication interface.

[0089] In one implementation, the communication device of the seventh, eighth or eleventh aspect mentioned above may be a terminal device or a communication module in a terminal device, or a chip or chip system in a terminal device.

[0090] In one implementation, the communication device of the seventh, eighth or eleventh aspect mentioned above may be a network device or a communication module in a network device, or a chip or chip system in a network device.

[0091] In a twelfth aspect, a chip is provided, including a processor for invoking a computer program or computer instructions in a memory to cause the processor to execute or implement any of the first to sixth aspects described above, or any possible implementation of any of the first to sixth aspects.

[0092] In some implementations, the processor is coupled to the memory via an interface.

[0093] In a thirteenth aspect, a communication system is provided, comprising a first device and a second device. The first device is configured to execute the first aspect and any possible implementation thereof, and the second device is configured to execute the second aspect and any possible implementation thereof. Alternatively, the first device is configured to execute the third aspect and any possible implementation thereof, and the second device is configured to execute the fourth aspect and any possible implementation thereof. Alternatively, the first device is configured to execute the fifth aspect and any possible implementation thereof, and the second device is configured to execute the sixth aspect and any possible implementation thereof.

[0094] The description of the beneficial effects of any of the seventh to thirteenth aspects can be referred to the description of the corresponding beneficial effects of the first to sixth aspects. Attached Figure Description

[0095] Figure 1 This is a schematic diagram of a communication system.

[0096] Figure 2 This is a schematic diagram of another communication system.

[0097] Figure 3 This is a schematic diagram of yet another communication system.

[0098] Figure 4 This is a schematic diagram of another type of communication system.

[0099] Figure 5 This is a schematic diagram of the time-frequency resources in the random access procedure.

[0100] Figure 6 This is a schematic flowchart of the random access method.

[0101] Figure 7 This is a schematic flowchart of a communication method provided in an embodiment of this application.

[0102] Figure 8 This is a schematic flowchart of some random access procedures provided in the embodiments of this application.

[0103] Figure 9This is a schematic block diagram of some random access messages provided in the embodiments of this application.

[0104] Figure 10 This is a schematic diagram of some random access resource configurations provided in the embodiments of this application.

[0105] Figure 11 This is a schematic diagram illustrating the identification of downlink control information (DCI) by multiple terminal devices in accordance with embodiments of this application.

[0106] Figure 12 This is a schematic diagram of time-frequency resources from synchronization signal block (SSB) to RAR provided in an embodiment of this application.

[0107] Figure 13 This is a schematic flowchart illustrating another communication method provided in an embodiment of this application.

[0108] Figure 14 This is a schematic flowchart illustrating another communication method provided in the embodiments of this application.

[0109] Figure 15 This is a schematic block diagram of a communication device provided in an embodiment of this application.

[0110] Figure 16 This is a schematic diagram of another communication device provided in an embodiment of this application.

[0111] Figure 17 This is a schematic diagram of a chip system provided in an embodiment of this application.

[0112] Figure 18 This is a schematic diagram of another chip system provided in an embodiment of this application. Detailed Implementation

[0113] In this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0114] I. In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can mean: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b, and c. Here, a, b, and c can each be single or multiple.

[0115] II. In this application, the terms "first," "second," and various numerical designations (e.g., #1, #2, etc.) indicate distinctions made for ease of description and are not intended to limit the scope of the embodiments of this application. For example, they may distinguish different messages, rather than describing a specific order or sequence. It should be understood that such descriptions can be interchanged where appropriate to describe solutions other than those in the embodiments of this application.

[0116] Third, in this application, descriptions such as "when," "under the circumstances," and "if" all refer to the device making corresponding processing under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment action when implementing it, nor do they imply any other limitations.

[0117] IV. In this application, "instruction" or "for instruction" can include both direct (or explicit) and indirect (or implicit) instruction. When describing instruction information as indicating A, it can include whether the instruction information directly or indirectly indicates A, but does not necessarily mean that the instruction information carries A. For example, in the case of indirect (or implicit) instruction, the receiving end of the instruction information can obtain A based on the parameters indicated by the instruction information, combined with other rules or parameters, or through deduction.

[0118] V. The indication methods involved in the embodiments of this application should be understood to cover various methods that enable the party to be indicated to obtain the information to be indicated. The information to be indicated can be sent as a whole or divided into multiple sub-information and sent separately. Moreover, the sending period and / or sending time of these sub-information can be the same or different. This application does not limit the sending method, for example.

[0119] VI. In this application, "protocol" can refer to standard protocols in the field of communications, such as 5G protocols, new radio (NR) protocols, and related protocols applied to future communication systems; this application does not limit this term. "Predefined" can include predefined terms, such as protocol definitions. "Preconfiguration" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device; this application does not limit the implementation method.

[0120] VII. In this application, "communication" can also be described as "data transmission," "information transmission," "data processing," etc. "Transmission" includes "sending" and / or "receiving." For example, transmission can be uplink transmission, such as a terminal device sending a signal to a network device; transmission can also be downlink transmission, such as a network device sending a signal to a terminal device; transmission can also be sidelink transmission, such as a terminal device sending a signal to another terminal device. For example, "transmission" can be air interface level transmission, or it can be signal transmission from a chip input (I) / output (O) port, rather than air interface level transmission.

[0121] 8. In this application, terms such as “message”, “information”, “signal” or “information element (IE)” can be used interchangeably. There are no restrictions on the name of the message or information, as long as it can achieve the corresponding function.

[0122] 9. "Sending information to XX (device)" can be understood as the destination of the information being that device. This can include sending information directly or indirectly to that device. "Receiving information from XX (device), or receiving information from XX (device)" can be understood as the source of the information being that device. This can include receiving information directly or indirectly from that device. Information may undergo necessary processing between the source and destination, such as format changes, but the destination can understand the valid information from the source. Similar expressions in this application can be understood in a similar way, and will not be repeated here. In addition, "sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. In other words, "sending" or "receiving" can be performed between devices, for example, network devices and terminal devices can send or receive information through an air interface, or "sending" or "receiving" can be performed within a device, for example, through a bus, wiring, or interface between components, modules, chips, software modules, or hardware modules within the device.

[0123] 10. In this application, terms such as "exemplarily" and "for example" are used to indicate examples, illustrations, or descriptions to present concepts in a specific manner. Any embodiment or design described as an "example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. In the embodiments of this application, the terms "of," "corresponding (relevant)," "corresponding," and "associated" may sometimes be used interchangeably, and it should be noted that their intended meanings are consistent unless their distinctions are emphasized.

[0124] XI. In this application, configuration can be signaling configuration or can be described as configuring signaling. For example, signaling configuration includes configuration using signaling sent by network devices, which can be radio resource control (RRC) messages, downlink control information (DCI) messages, or system information blocks (SIBs). Another example is signaling configuration between network devices. These network devices can include access network devices, core network devices, or management plane devices, etc. Optionally, signaling configuration can also be configured to terminal devices or network devices using pre-configured signaling, or configured to terminal devices or network devices through pre-configuration. Here, pre-configuration refers to defining or configuring the values ​​of corresponding parameters in advance using a protocol, and storing them in the terminal device or network device during communication. Pre-configured messages can be modified or updated when the terminal device or network device is connected to the network.

[0125] 12. This application will present various aspects, embodiments, or features relating to systems that may include multiple devices, components, modules, etc. Each system may include devices, components, modules, etc., other than those illustrated, and / or may not include all and all of the devices, components, modules, etc. discussed in conjunction with the accompanying drawings.

[0126] Thirteen, the business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0127] XIV. In the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The terms "comprising," "including," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0128] The technical solutions of this application embodiment can be applied to various communication systems, including but not limited to: Long Term Evolution (LTE) systems, NR systems, and 5G (5G) systems. th This includes various mobile communication systems such as 5G, narrowband Internet of Things (NB-IoT), enhanced machine-type communication (eMTC), enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), satellite communication systems, LTE-machine-to-machine (LTE-M) systems, and other systems that evolve after 5G, such as future mobile communication systems.

[0129] The following describes the solutions of embodiments of this application with reference to the accompanying drawings.

[0130] Figure 1 This is a schematic diagram of a communication system 100. (For example...) Figure 1 As shown, the communication system 100 includes a wireless access network 110 and a core network 120. Optionally, the communication system 100 may also include an Internet 130. The wireless access network 110 may include at least one access network device (such as...). Figure 1 111a and 111b in the above), may also include at least one terminal device (such as Figure 1(112a-112j in the original text). The terminal device connects to the access network device wirelessly. The access network device connects to the core network 120 wirelessly or via a wired connection. The core network 120 may include one or more core network devices. The core network device and the access network device may be independent physical devices, or the functions of the core network device and the logical functions of the access network device may be integrated on the same physical device, or a single physical device may integrate some of the functions of the core network device and some of the functions of the access network device. Terminal devices and access network devices can be interconnected via wired or wireless means. Terminal devices can communicate wirelessly with each other, with each other, and with each other via air interface resources. For example, air interface resources may include at least one of time-domain resources, frequency-domain resources, code resources, and spatial resources. Figure 1 This is a schematic diagram. The communication system 100 may also include other access network equipment, such as wireless repeater equipment and wireless backhaul equipment. Figure 1 It is not shown in the middle.

[0131] Access network equipment can be any device with wireless transceiver capabilities. For example, access network equipment can be a base station used to connect terminal devices to a radio access network (RAN). Access network equipment is sometimes also referred to as access network element, access network node, RAN node, or RAN. It is understood that the names of devices with access network functionality may differ in systems employing different wireless access technologies. For ease of description, devices that provide wireless communication access functionality to terminal devices can be collectively referred to as base stations or RANs.

[0132] Access network equipment can be used for the 3rd Generation Partnership Project (3GPP). rd Cellular systems related to the Generation Partnership Project (3GPP), such as 4G mobile communication systems, 5G mobile communication systems, non-terrestrial network (NTN) systems, or future communication systems, etc. Access network equipment can also be access network equipment in open RAN (O-RAN or ORAN), cloud radio access network (CRAN), or wireless fidelity (Wi-Fi) systems, or access network equipment in communication systems that integrate two or more of the above systems.

[0133] When the access network device is an access network device in an NTN system, the access network device can be in regeneration mode or transparent transmission mode, and this application does not limit it.

[0134] For example, access network equipment includes, but is not limited to: various forms of macro base stations (such as...) Figure 1 111a), micro base stations or indoor stations (such as Figure 1 Access network equipment includes 111b), picocells, small cells, balloon stations, relay stations, access points, etc., in LTE. It can also include evolved node B (eNB or eNodeB) in LTE, access points (APs), wireless relay nodes, wireless backhaul nodes, transmission points (TRPs or TPs), or transmission reception points (TRPs) in Wi-Fi systems, terminal equipment implementing network functions in device-to-device (D2D) or vehicle-to-everything (V2X) systems, next-generation node B (gNB) or transmission points (TRPs or TPs) in 5G systems, one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, network nodes constituting a gNB or transmission point, such as baseband units (BBUs) or distributed units (DUs), and access network equipment, servers, or vehicle-mounted equipment in networks evolving after 5G.

[0135] Optionally, access network equipment may also include servers, wearable devices, vehicles, or in-vehicle equipment. For example, access network equipment in V2X technology can be a roadside unit (RSU).

[0136] Access network equipment can also be modules or units that perform some of the functions of a base station. For example, it can be a central unit (CU) or a DU.

[0137] In this embodiment, the apparatus for implementing the functions of the access network device can be the access network device itself, or it can be an apparatus capable of supporting the access network device in implementing the functions, such as a chip system, which can be installed in the access network device. The chip system can be composed of chips, or it can include chips and other discrete components.

[0138] In another possible scenario, multiple access network devices collaborate to assist the terminal in achieving wireless access, with each access network device performing a portion of the base station's functions. For example, the access network devices can be CU, DU, CU (control plane, CP), CU (user plane, UP), or radio unit (RU), etc. CU and DU can be configured separately or included in the same network element, such as in a BBU. RU can be included in radio equipment or radio units, such as in a remote radio unit (RRU), active antenna unit (AAU), or remote radio head (RRH).

[0139] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an open radio access network (O-RAN) system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software modules and hardware modules. The embodiments of this application do not limit the specific technology or specific device form used in the access network equipment.

[0140] Terminal equipment can be a device that provides voice and / or data connectivity to a user; alternatively, it can be an entity on the user side used to receive or transmit signals. Terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as on ships); and it can be deployed in the air (e.g., on airplanes, balloons, and satellites). Terminal equipment can also be referred to as user equipment (UE), access terminal, terminal, subscriber unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, wireless network equipment, user agent, or user device. In this application embodiment, terminal devices include, but are not limited to: cellular phones, mobile phones, wireless data cards, wireless modems, tablets, laptop computers, notebook computers, handheld computers, mobile internet devices (MIDs), computers with wireless transceiver capabilities, cordless phones, session initiation protocol (SIP) phones, smartphones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handsets with wireless communication capabilities, computing devices or other devices connected to wireless modems, in-vehicle devices (e.g., cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed trains, etc.), wearable devices (e.g., smartwatches, smart bracelets, pedometers, smart glasses, etc.), satellite terminals, terminal devices in the Internet of Things or the Internet of Vehicles, as well as any form of terminal in future networks, relay user equipment, or terminals in future evolved public land mobile networks (PLMNs), etc.Terminal devices can also be virtual reality (VR) devices, augmented reality (AR) devices, smart point-of-sale (POS) machines, customer-premises equipment (CPE), light user equipment (UE), reduced capability user equipment (REDCAPUE), machine type communication (MTC) terminals, terminal devices in industrial control, terminal devices in self-driving, terminal devices in telemedicine, terminal devices in smart grids, wireless terminals in transportation safety, terminal devices in smart cities, terminal devices in smart homes, tactile terminal devices, smart home devices (e.g., refrigerators, televisions, air conditioners, electricity meters, etc.), smart robots, robotic arms, workshop equipment, wireless terminals in self-driving, or flying devices (e.g., smart robots, hot air balloons, drones, airplanes), etc. The terminal device can also be a vehicle device, such as a complete vehicle device, an in-vehicle module, an in-vehicle chip, an on-board unit (OBU), or a telematics box (T-BOX). The terminal device can also be other devices with terminal functions; for example, it can be a device that functions as a terminal in D2D communication. This application does not limit the scope of the embodiments.

[0141] In this application embodiment, the device for implementing the functions of the terminal device can be the terminal device itself, or it can be any device capable of supporting the terminal device in implementing those functions, such as a chip or chip system. This device can be installed in the terminal device. The chip system can consist of chips or include chips and other discrete components. In the technical solution of this application embodiment, the device for implementing the functions of the terminal device is the terminal device, which can also be called a terminal.

[0142] The roles of base stations and terminals can be relative, for example, Figure 1The helicopter or drone 112i can be configured as a mobile base station. For terminals 112j that access the wireless access network 110 via 112i, terminal 112i is a base station; however, for base station 111a, 112i is a terminal, meaning that 111a and 112i communicate via a wireless air interface protocol. Of course, 111a and 112i can also communicate via a base station-to-base station interface protocol; in this case, relative to 111a, 112i is also a base station. Therefore, both base stations and terminals can be collectively referred to as communication devices. Figure 1 111a and 111b in the diagram can be referred to as communication devices with base station functionality. Figure 1 The 112a-112j in the text can be referred to as communication devices with terminal functions.

[0143] Access network devices and terminal devices can communicate via wireless links. The transmission link from the access network device to the terminal device can be called a downlink (DL) or downlink channel, used for transmitting downlink signals. The transmission link from the terminal device to the access network device can be called an uplink (UL) or uplink channel, used for transmitting uplink signals. The transmission link from one terminal device to another can be called a sidelink (SL) or sidelink channel, used for transmitting sidelink signals.

[0144] Communication between access network devices and terminal devices can follow a specific protocol layer structure. This protocol layer may include a control plane protocol layer and a user plane protocol layer. The control plane protocol layer may include at least one of the following: radio resource control (RRC) layer, packet data convergence protocol (PDCP) layer, radio link control (RLC) layer, media / medium access control (MAC) layer, or physical (PHY) layer, etc. The user plane protocol layer may include at least one of the following: service data adaptation protocol (SDAP) layer, PDCP layer, RLC layer, MAC layer, or physical layer, etc.

[0145] For example, the RRC layer of the access network device and the RRC layer of the terminal device can exchange RRC signaling or other messages. As another example, the PHY layer of the access network device can send a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) to the PHY layer of the terminal device, and so on. Similarly, the PHY layer of the terminal device can send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) to the PHY layer of the access network device, and so on.

[0146] Figure 2 This is a schematic block diagram of another communication system. This communication system may also be called an O-RAN system or other names. This communication system may include a core network, access network equipment, etc. Figure 2 (referred to as RAN in the original text) and UE. As an example, the communication system may also include... Figure 2 Other components besides those shown are not specifically limited in this application.

[0147] Access network devices can communicate with the core network (CN) via a backhaul link. For example, a BBU in an access network device communicates with the core network via a backhaul link. Access network devices can also communicate with UEs via an air interface. For example, an RU in an access network device communicates with at least one UE via an air interface. The BBU communicates with at least one RU via a fronthaul link. The BBU and RU may or may not be co-located; this application does not limit this. The BBU may include at least one CU and at least one DU, and the CU and DU can communicate with each other via at least one midhaul link.

[0148] For example, the CU can be used to perform functions of the upper layer. For instance, the upper layer may include layer 2 (L2) and / or layer 3 (L3). The DU can be used to perform functions of layer 1 (L1) and / or part of L2. The RU can be used to perform computational and digital radio frequency (RF) functions of L1. In some possible implementations, the DU can be deployed as a single unit, i.e., the DU can perform the functions of the DU and RU described above.

[0149] For example, the CU and / or DU may include a chassis platform, motherboard, peripheral devices or cooling devices, etc. The motherboard may include processing units, memory, internal I / O interfaces or external connection ports, etc.

[0150] The processing unit can be a processor, such as one or more of the following: a central processing unit (CPU), an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a microprocessor unit (MPU), a microcontroller unit (MCU), a graphics processing unit (GPU), a field-programmable gate array (FPGA), an artificial intelligence processor (AI processor), a multi-core processor, or a neural processing unit (NPU). Exemplarily, the processor can also be an x86 processor, a non-x86 processor, an advanced instruction set computer (RISC) machine (ARM processor), or another type of processor.

[0151] In some possible implementations, the processor may connect to one or more hardware accelerators. As an example, the hardware accelerator may support interconnection with x86 or non-x86 processors. For instance, the hardware accelerator could be an FPGA, GPU, or other accelerator. Exemplarily, the processor and the hardware accelerator may have a peripheral component interconnect (PCI) express (PCIe) interface and communicate through this PCIe interface. Exemplarily, the hardware accelerator may communicate with the outside world via a gigabit Ethernet (GbE) interface.

[0152] For example, components of a hardware accelerator may include: software, hardware, or a memory for a system debugging interface, or a single-board management controller.

[0153] For example, a DU system can be implemented using a processor (e.g., a multi-core processor) and one or more hardware accelerators. For instance, portions of the DU protocol stack can be implemented in software running on the processor, while computationally intensive L1 and L2 functions can be offloaded to FPGA- and / or GPU-based hardware accelerators. Alternatively, all L1 functions can be offloaded to FPGA- and / or GPU-based hardware accelerators, while other protocol stack components are implemented in software running on the processor. Yet another example is that the entire protocol stack is implemented in software running on the processor.

[0154] For example, the RU may include an O-RAN processing unit (OPU), a digital processing unit (DPU), and an RF processing unit.

[0155] As an example, an OPU can be used to receive enhanced common public radio interface (eCPRI) frames from the O-RAN fronthaul, and / or to perform fronthaul interface, lowest-level L1 operations (e.g., encoding, scrambling, modulation, layer mapping, or precoding), synchronization, beamforming, or resource unit mapping, etc. Exemplarily, the OPU can be implemented as a CPU, FPGA, or ASIC. Exemplarily, the OPU can also be referred to as a RAN fronthaul link processing unit or other names.

[0156] As an example, a DPU can be used to perform synchronization, digital downconversion (DDC), digital upconversion (DUC), crest factor reduction (CFR), or digital pre-distortion (DPD), etc. In this way, the DPU can reduce the peak-to-average power ratio (PAPR) and / or adjacent channel leakage ratio (ACLR) of the RF front end. Exemplarily, the DPU may include an FPGA and / or an ASIC. The DPU can also be implemented in other forms.

[0157] As an example, an RF processing unit may include a transceiver module, an upconverter, a downconverter, a power amplifier (PA), a low noise amplifier (LNA), a transmit (Tx) filter, a receive (Rx) filter, or other devices.

[0158] For example, the transceiver module can be used to perform operations such as analog-to-digital conversion, digital-to-analog conversion, RF sampling, and frequency conversion using RF signals, intermediate frequency (IF) signals, and local oscillator (LO) signals in up-conversion and down-conversion.

[0159] The aforementioned physical device can also be a logic module, and the aforementioned logic module can also be a physical device; this application does not impose any limitations.

[0160] In some possible scenarios, O-RAN can incorporate artificial intelligence (AI). For ease of understanding, the following will combine... Figure 3 Let me introduce it.

[0161] Figure 3 This is a schematic diagram of yet another communication system. This system may include a RAN intelligent controller (RIC).

[0162] For example, a near-real-time RAN intelligent controller (RIC) can be used for model training and inference. For instance, it can be used to train an AI model and then use that AI model for inference. As an example, the near-real-time RIC can obtain network-side and / or terminal-side information from RAN nodes (e.g., CU, CU-CP, CU-UP, DU, and / or RU) and / or terminals. This information can be used as training data or inference data.

[0163] In some possible implementations, the near real-time RIC can deliver inference results to RAN nodes and / or terminals. Furthermore, in some possible implementations, inference results can be exchanged between CUs and DUs, and / or between DUs and RUs. For example, the near real-time RIC can deliver inference results to a DU, which then forwards the inference results to an RU.

[0164] For example, a non-real-time (NRT) RIC can be used for model training and inference. For instance, it can be used to train an AI model and then use that model for inference. The NRT RIC can obtain network-side and / or terminal-side information from RAN nodes (e.g., CU, CU-CP, CU-UP, DU, and / or RU) and / or terminals. This information can be used as training data or inference data, and the inference results can be delivered to the RAN nodes and / or terminals. Furthermore, in some possible implementations, inference results can be exchanged between CUs and DUs, and / or between DUs and RUs; for example, the NRT RIC delivers the inference results to the DU, which then sends the inference results to the RU.

[0165] In some examples, the near real-time RIC and non-real-time RIC described above can be configured as separate network elements. In other examples, the near real-time or non-real-time RIC can be part of other devices. For example, the near real-time RIC is set in a RAN node (e.g., in a CU or DU). As another example, the non-real-time RIC can be set in operations, administration and management (OAM) systems, cloud servers, core network devices, or other network devices.

[0166] Figure 4 This is a schematic diagram of another communication system. In the above communication system, network elements can be connected via interfaces (e.g., NG, Xn) or air interfaces. As an example, one or more AI modules can be configured in one or more devices in the core network, access network, terminal, or OAM. For ease of description, Figure 4 Only one AI module is shown in the document, but this application does not limit the specific number of AI modules.

[0167] In some examples, an access network node can be a single network element or multiple network elements. For example, an access network node may include a CU and a DU. As an example, the CU and / or DU may be configured with one or more AI modules. Optionally, the CU may be split into CU-CP and CU-UP. One or more AI models may be configured in the CU-CP and / or CU-UP.

[0168] AI modules can implement corresponding AI functions. AI modules deployed in different network elements can be the same or different. The model of an AI module can be configured with different parameters, enabling the AI ​​module to achieve different functions. The model of an AI module can be configured based on one or more of the following parameters: structural parameters (e.g., at least one of the following: number of neural network layers, neural network width, inter-layer connections, neuron weights, neuron activation function, or bias in the activation function), input parameters (e.g., type and / or dimension of input parameters), or output parameters (e.g., type and / or dimension of output parameters). The bias in the activation function can also be referred to as the bias of the neural network.

[0169] An AI module may have one or more models. A model can infer an output, which may include one or more parameters. The learning, training, or inference processes of different models may be deployed on different nodes or devices, or they may be deployed on the same node or device; this application does not impose any restrictions.

[0170] To better understand the embodiments of this application, the following is an introduction to the technical terms involved in the embodiments of this application.

[0171] 1. Initial Connection:

[0172] With the increasing diversity of wireless communication applications, future wireless communication processes may introduce numerous new technologies to meet the diverse needs of scenarios such as high speed, low latency, and massive connectivity. Initial access is crucial for a terminal device's initial connection to the network. The initial access process determines whether the terminal device can successfully register with the network and establish a connection with network devices (e.g., base stations) to enable subsequent data transmission and service access.

[0173] The primary goal of initial access is to allocate necessary communication resources and establish a reliable communication link for a terminal device when it first accesses or re-accesses the network. The random access procedure is particularly important during initial access. Random access can resolve time-frequency synchronization issues between the terminal device and network devices and allocate uplink resources to the terminal device for further communication. Depending on the different requirements of the access procedure, random access can be divided into contention-based random access (CBRA) and contention-free random access (CFRA).

[0174] Taking a 5G communication system as an example, in the initial access process, the terminal device searches for the synchronization signal block (SSB) to obtain the basic information required for access, such as frequency, timing synchronization, and system information. The SSB may include the master information block (MIB), which can also be called the master system message or other names.

[0175] As an example, a terminal device can obtain other system messages necessary for cell access by decoding the SSB, such as System Information Block 1 (SIB1). For ease of understanding, the following will illustrate this further. Figure 5 This section provides a specific example of a terminal device receiving an SSB.

[0176] Figure 5 This is a schematic diagram of the time-frequency resources used in the random access procedure. See also... Figure 5 In the upper part, the terminal device can first receive the SSB and obtain the frequency domain resources and detection timing of the control resource set #0 (CORESET #0) for scheduling SIB1 from the MIB in the SSB. Based on the frequency domain resources and detection timing of CORESET #0, the terminal device can detect the PDCCH of SIB1 to obtain the scheduling information of SIB1. Further, the terminal device can obtain SIB1 based on the scheduling information of SIB1. As an example, the scheduling information may include at least one of the following: resource location, resource size, or modulation and coding scheme, etc.

[0177] SIB1 is used to instruct the terminal device to initiate resource configuration for random access. As an example, SIB1 may include carrier position, carrier bandwidth, initial uplink bandwidth part (BWP) and initial downlink BWP configuration, etc.

[0178] For example, the initial uplink BWP (or initial ULBWP) configuration described above may include a random access channel (RACH) configuration. As an example, the RACH configuration may include resource configurations for transmitting a random access (RA) preamble, such as time-frequency resources for the RACH occasion (RO) and available random access preambles. For example, the aforementioned random access preamble may also be referred to as a preamble, physical random access channel (PRACH) preamble, preamble sequence, random access sequence, message 1 (MSG1 or Msg1), or other names, without limitation in this application. For example, the aforementioned RACH configuration may also be referred to as PRACH configuration or RACH common configuration.

[0179] See Figure 5 The lower half of the configuration, the initial ULBWP setup, can include multiple Remote Access Points (ROs) on periodic RACH slots. The terminal device can randomly select an RO and a preamble to initiate random access. For example... Figure 5 As shown, assuming the shaded RO is the RO selected by the terminal device, the terminal device can initiate random access on this RO.

[0180] Taking a 5G communication system as an example, terminal devices can send preambles on the PRACH. Sending a preamble can be understood as the terminal device sending an access request to the network device. For example, the preamble can be a Zadoff-Chu sequence sent within a short period. The preamble can have good autocorrelation and cross-correlation properties, which helps the network device accurately detect the access request.

[0181] Figure 6 This is a schematic flowchart illustrating the random access method. Among them, Figure 6 (a) shows a schematic flowchart of the four-step random access method. See also Figure 6 In (a), the terminal device can send Msg1 to the network device. This Msg1 may include a random access (RA) preamble. The following section combines... Figure 6 Section (a) continues to describe the subsequent operations of the four-step random access.

[0182] For example, after receiving the preamble, the network device can send a random access response (RAR) message to the terminal device.

[0183] As an example, RAR may include the identifier of the preamble received by the network side, the timing adjustment indication for uplink synchronization, the temporary network side identity, and the indication information of uplink resources for the terminal device to send message 3 (MSG3 or Msg3).

[0184] For example, the aforementioned preamble identifier could be a random access preamble identifier (RAPID). For example, the aforementioned timing adjustment indication for uplink synchronization could be a time advance (TA) indication. For example, the aforementioned temporary network-side identifier could be a temporary cell radio network temporary identifier (RNTI) (TC-RNTI). For example, the aforementioned indication information for scheduling uplink resources for the terminal device to transmit Msg3 could be UL grant information.

[0185] For example, the TC-RNTI can be a temporary identifier assigned by the network device to a terminal device to distinguish the random access procedures of different terminal devices. In some examples, each terminal device's Msg1 can be mapped to a corresponding TC-RNTI, and the network device identifies the terminal device through the TC-RNTI and sends a RAR message to that terminal device.

[0186] In some possible implementations, network devices can broadcast RAR messages on the PDSCH via the PDCCH. For example, the reception and decoding of RAR messages can be indicated by the DCI (denoted as RARDCI) carried on the PDCCH. As an example, the PDCCH scrambled by RA-RNTI can indicate in which time slot the terminal device receives the RAR message and provide scheduling information for the RAR message (e.g., including the time-frequency resources of the RAR message, etc.).

[0187] For example, the aforementioned RAR message may also be called message 2 (MSG2 or Msg2) or other names, which are not limited in this application.

[0188] For CBRA, if multiple terminal devices use the same preamble, subsequent steps are required to resolve the conflict. For example, after successfully receiving a RAR message, a terminal device can send an RRC connection request message based on the allocated uplink resources. This RRC connection request message can be used to request an RRC connection and / or request conflict resolution. For example, this RRC connection request message can also be called Msg3 or other names, which are not limited in this application.

[0189] For example, in response to an RRC connection request message, the network device can send message 4 (MSG4 or Msg4) to the terminal device, thereby establishing an RRC connection. Based on the above four steps, the terminal device successfully accesses the network and can then perform subsequent communication and data transmission.

[0190] The above is a brief example of a four-step random access method in a 5G NR system. The initial access method in this application is not limited to the four-step random access method described above; for example, this application can also be applied to a two-step random access method or other random access methods proposed in the future.

[0191] As an example, the essence of two-step random access can be simply understood as follows: when the terminal device sends the preamble, it also sends the content used for conflict resolution contained in Msg3 of the four-step random access method to the network side. The network side can then send the content contained in Msg2 and Msg4 of the four-step random access method to the terminal device. For easier understanding, the following will combine... Figure 6 Section (b) provides an example of a two-step random access method.

[0192] See Figure 6 In (b), the terminal device can send message A (messageA, MSGA, or MsgA) to the network device.

[0193] As an example, the MsgA may include at least one of the following: RA preamble, or the identity information of the terminal device, etc.

[0194] In some examples, the time-frequency resources used to transmit MsgA can be configured with SIB1. For example, SIB1 can be used to indicate the association between the time-frequency resources used to transmit the preamble and the time-frequency resources used to transmit other information in MsgA.

[0195] For example, the MsgA mentioned above may have other names, which are not limited in this application.

[0196] See Figure 6 In (b), the network side can send message B (messageB, MSGB, or MsgB) to the terminal device.

[0197] For example, MsgB may include at least one of the following: an identifier of the preamble received by the network side, a timing adjustment indication for uplink synchronization, a temporary network-side identity, or information for contention resolution, etc. As an example, the identifier of the preamble may be RAPID. As an example, the temporary network-side identity may be TC-RNTI. For example, MsgB may have other names, which are not limited in this application.

[0198] 2. SSB:

[0199] SSB is an information structure proposed by NR. SSB can also be called synchronization signal / physical broadcast channel block, synchronization signal block, SSB signal, SSB beam, or other names.

[0200] For example, an SSB may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). When the terminal device is moving, it can continuously perform cell search and measurement based on the SSB, select an appropriate SSB beam, and thus achieve initial access and mobility management for the terminal device.

[0201] For example, each SSB can occupy four consecutive symbols in the time domain and 20 resource blocks (RBs) in the frequency domain. The 20 RBs can include 240 subcarriers. As an example, with a subcarrier spacing (SCS) of 15 kHz, an SSB can occupy a bandwidth of 3.6 MHz.

[0202] The PSS and SSS can occupy the first and third symbols of the SSB, respectively. Both the PSS and SSS can occupy 127 subcarriers. The PBCH can occupy the second and fourth symbols of the entire SSB, as well as the third symbol and 48 subcarriers at each end of the frequency domain resources. The PBCH can carry two parts of resources: a payload, including higher-layer payloads and physical layer payloads; and a demodulation reference signal (DMRS). For example, the higher-layer payload may include the MIB.

[0203] Unless otherwise specified, the term "symbol" in this application can be understood as a time-domain symbol, that is, a unit in the time domain. For example, a symbol can be an orthogonal frequency division multiplexing (OFDM) symbol.

[0204] As an example, the PSS can be used for coarse synchronization and to carry some parameters of the physical cell identifier (PCI). For example, the PSS can carry an M-sequence of length 127, specifically three different sequences. As an example, the SSS can be used for secondary synchronization and to carry the remaining parameters of the PCI. For example, the SSS can carry a Gold sequence of length 127, specifically 336 different sequences. As an example, the PBCH can carry broadcast system messages (e.g., MIB). Broadcast system messages can be called synchronization broadcast signals or other names.

[0205] For example, the PBCH may include 24 bits of broadcast control channel (BCCH) - broadcast channel (BCH), 8 bits of physical layer timing-related information, and 24 bits of cyclic redundancy check (CRC) information.

[0206] For example, in a 5G communication system (or NR communication system), messages on the PBCH (referred to as "PBCH messages") may include information as shown in Table 1.

[0207] Table 1

[0208] Number of bits / Number of RBs SFN 10 SIB1 Configuration 8 CRC 24 total 56 RB size 48

[0209] The information indicating the SFN (hereinafter referred to as "SFN information") can occupy 10 bits. The information indicating the SIB1 configuration (hereinafter referred to as "SIB1 configuration information") can occupy 8 bits. The CRC information can occupy 24 bits. The PBCH message may also include other information. As an example, the total number of bits in the PBCH message can be 56. The PBCH message can occupy a total of 48 RBs. It is understood that the various information and bit numbers shown in Table 1 are only examples and are not intended to limit this application.

[0210] 3. System Frame Number (SFN):

[0211] In NR communication systems, SFN is a key parameter. SFN can be understood as a cyclic counter in the communication network, using 10 bits to identify the frame number during wireless communication. Thus, the SFN can cyclically increment within 1024 unique numbers (ranging from 0 to 1023). Each SFN corresponds to a complete radio frame. In the NR standard, the length of a radio frame (or system frame) can be 10 milliseconds (ms); in other words, the radio frame can have a period of 10 ms.

[0212] The function of a SFN is similar to that of a system frame number in an LTE system. As an example, SFNs can be used for frame-level timing synchronization and radio resource management. For instance, when a terminal device accesses the network, it can obtain SFN information (e.g., 10 bits in length) by broadcasting system messages (e.g., MIBs) to synchronize with network timing. Furthermore, network devices can use SFNs for radio resource management, such as scheduling transmission time slots or scheduling uplink and downlink data transmissions, and other scheduling control operations.

[0213] During initial access, the terminal device can determine the uplink resource location for Msg1 or MsgA based on the SFN, that is, determine the uplink resources used to transmit Msg1 or MsgA. Taking Msg1 as an example, in the current NR standard, the PRACH period (or PRACH resource period) can be 10ms to 160ms, that is, one PRACH period can include 1 to 16 radio frames. The PRACH period can be periodically and continuously distributed across 1024 radio frames that can be indicated by the 10 bits of the SFN information.

[0214] In some examples, the terminal device can determine the starting radio frame of the PRACH period based on the SFN in the PBCH, and determine the position of the radio frame used to transmit Msg1 based on the offset of the radio frame used to transmit Msg1 within the PRACH period. For example, assuming the PRACH period is 160ms, this indicates that the SFN of the starting radio frame of the PRACH period is 16a, where a is an integer from 0 to 63. The terminal device can determine the SFN of the radio frame receiving the PBCH through the SFN indicated by the PBCH, thereby determining the position of the starting radio frame of the PRACH period.

[0215] The above examples are for illustrative purposes only. In other examples, the terminal device may determine the location of the radio frame used to transmit Msg1 in other ways based on the PRACH period and the offset of the radio frame used to transmit Msg1 within the PRACH period.

[0216] 4. Low-bandwidth terminal equipment:

[0217] In traditional 5G NR technology, communication equipment typically requires full connectivity capabilities, including high-speed data transmission and low latency. Release 17 introduced reduced capability (RedCap) technology. RedCap technology limits the capabilities of communication equipment, providing a lighter-weight access solution for terminal devices that do not require full capabilities. By simplifying the functions of communication equipment, RedCap technology reduces the complexity and cost of the equipment, enabling devices using RedCap technology (or "RedCap devices") to access the communication network without full communication capabilities.

[0218] As an example, a RedCap device can be a low-cost, simple device that still needs to access a communication network. For instance, a RedCap device could be an IoT device.

[0219] In future communication networks, there may be terminal devices that only perform uplink and downlink transmissions within a narrow bandwidth (e.g., X MHz). For example, X may be 3, 5, or other values. For ease of description, these terminal devices may be referred to as Type I terminals (or narrowband terminal devices, bandwidth-limited terminal devices, low-capacity terminal devices, kernel terminal devices, or other names).

[0220] The bandwidth of a Type I terminal is constrained during a certain uplink or downlink transmission. Possible reasons include: limitations of the Type I terminal's own capabilities; energy-saving requirements of the Type I terminal, etc. This application does not limit the reasons for the bandwidth limitation of the Type I terminal. Furthermore, conceptually, the Type I terminal may or may not belong to the RedCap device category; this application does not make any limitation.

[0221] For ease of description, this application refers to terminal devices capable of uplink and downlink transmissions outside the aforementioned narrower bandwidth (e.g., X MHz) as second-type terminals (or broadband terminal devices, bandwidth-unrestricted terminal devices, high-capacity terminal devices, nested terminal devices, or other names). In other words, a second-type terminal is a terminal device that supports a bandwidth greater than that supported by a first-type terminal. It is understood that a second-type terminal can be a device corresponding to a first-type terminal. Compared to second-type terminals, first-type terminals are more energy-efficient and less susceptible to interference from signals outside the X MHz range.

[0222] The first communication method provided in the embodiments of this application is described below. This communication method can reduce the configuration overhead of terminal devices for random access.

[0223] Figure 7This is a schematic flowchart of a communication method 700 provided in an embodiment of this application. Optional operations in method 700 are shown with dashed lines. The nodes involved in method 700 are described below.

[0224] First device: Unless otherwise specified, the first device in this application can be a communication device (e.g., a terminal device), a component of the communication device (e.g., a processor, chip, or chip system), or a logic module or software capable of implementing some or all of the functions of the communication device. For ease of description, the following description will take a terminal device as the first device.

[0225] Second device: Unless otherwise specified, the second device in this application can be a communication device (e.g., a network device, or more specifically, an access network device), a component of a communication device (e.g., a processor, chip, or chip system), or a logic module or software that can implement some or all of the functions of the communication device. For ease of description, the following description uses a network device as an example of the second device.

[0226] The following is combined Figure 7 This section introduces the various operations of method 700.

[0227] S710, the network device generates a PBCH message. This PBCH message may include the first part of the SFN information bits.

[0228] For ease of understanding, the total number of bits in an SFN message can be denoted as M, where M is a positive integer. Thus, the total number of bits in an SFN message can be represented as M bits.

[0229] The first part of the bits can be a portion of the M bits, meaning the number of bits in the first part (denoted as P) is less than M. SFN information can be used to indicate the SFN. For example, P can be equal to 1, 2, ..., M-1.

[0230] Taking the NR system as an example, the SFN information in the NR system can have a total of 10 bits (i.e., M = 10), thus indicating 1024 SFNs. The number of bits in the first part (denoted as P) can be a positive integer less than 10. That is, P can be equal to 1, 2, 3, 4, 5, 6, 7, 8, or 9.

[0231] The above example uses M=10, but in this application, M can be equal to 10, or less than or greater than 10, and this application does not impose any limitation. For example, in future communication systems, all bits of SFN information may still be 10 bits (i.e., M=10), or more or less than 10 bits (i.e., M is greater than 10 or M is less than 10), and this application does not impose any limitation.

[0232] Furthermore, SFN is the radio frame number in the NR system. In future communication systems, the radio frame number may still be named SFN, or it may be named other information; the embodiments of this application do not limit this. In this application, SFN can be replaced with or understood as information indicating a radio frame in a future communication system. As an example, SFN can be replaced with or understood as the radio frame number. For ease of understanding, this application describes it as the name of the radio frame number.

[0233] Furthermore, the radio frame is the fundamental period of data transmission in an NR system. In future communication systems, the fundamental period of data transmission may still be named the radio frame, or it may be named using other time units. The radio frame in this application can be replaced with or understood as the "fundamental period of data transmission" in future communication systems. For ease of understanding, this application describes it as the radio frame as the name of the fundamental period of data transmission.

[0234] The following are some examples of PBCH messages.

[0235] Among them, PBCH messages can be messages carried on some or all of the PBCH.

[0236] As an example (1), the PBCH message can carry basic access-related information. As an example (2), the PBCH message can be the first message of bearer system information received by the terminal device after obtaining downlink synchronization.

[0237] In future communication networks, a message that satisfies at least one of the following: (1) a message carrying basic access-related information, or (2) a message received after the terminal device has obtained downlink synchronization. This message may still be called a PBCH message, or it may have other names. The PBCH message in this application can be understood as, or replaced by, the name of a message in a future communication network that satisfies at least one of (1) to (2) above. For ease of understanding, this application describes the message that satisfies at least one of (1) to (2) above as a PBCH message.

[0238] In S720, the network device sends a PBCH message to the terminal device. Correspondingly, the terminal device receives the PBCH message from the network device.

[0239] In this application, PBCH message can also be replaced with "PBCH information", "PBCH", "kernel PBCH message", "core PBCH information", "core PBCH" or other names. For example, "network device sends PBCH message to terminal device" can be understood as network device sending PBCH to terminal device.

[0240] In some examples, PBCH messages can be carried within an SSB. Therefore, PBCH messages in this application can be replaced with an SSB. This SSB can also be called the core SSB or other names.

[0241] S750, the terminal device performs random access based on this first part of bits.

[0242] The first part of the bits can be P bits. P bits can distinguish 2... P A radio frame. In some possible implementations, the S750 includes: the terminal device can implement 2 via the first part of the bits in the PBCH message. P Synchronization at the level of one wireless frame, thus achieving 2 P The preamble is transmitted in one of the radio frames.

[0243] For example, 2 P Synchronization at the wireless frame level can be understood as the terminal device being able to obtain 2 P The starting position of a wireless frame, or what can be understood as the position between the network device and the terminal device, 2 P Align the start positions of each wireless frame.

[0244] As a concrete example, if P=3, then the terminal device can achieve synchronization at the level of 8 radio frames. If a radio frame lasts for 10ms, then the terminal device can achieve synchronization for 80ms.

[0245] As another concrete example, if P=4, then the terminal device can achieve synchronization at the level of 16 radio frames. If a radio frame lasts for 10ms, then the terminal device can achieve synchronization for 160ms.

[0246] Compared to the conventional approach of carrying all bits of the SFN (i.e., M bits) in the PBCH message, method 700 reduces the number of bits carried in the PBCH message by carrying only a portion of the SFN (i.e., P bits), thereby reducing the configuration overhead for random access by the terminal device. Furthermore, by reducing the number of bits carried in the PBCH message, this approach allows the PBCH message to be transmitted on a narrower frequency band, enabling bandwidth-constrained terminal devices to receive the PBCH message on a narrower frequency band. Therefore, this approach facilitates random access configuration for bandwidth-constrained terminal devices.

[0247] In some possible implementations, the method also includes: S740.

[0248] S740, the terminal device receives first information from the network device. This first information may include the second portion of the SFN information. As an example, the first information can be understood as a field carrying the second portion of the bits.

[0249] Correspondingly, the network device sends the first information to the terminal device.

[0250] The second part of the bits can be a portion of the M bits in the SFN information. For example, the second part of the bits and the aforementioned first part of the bits can constitute all the bits of the SFN information (i.e., M bits). Thus, method 700 can also be understood as follows: in S710, the network device sends a portion of the SFN information (i.e., the first part of the bits) to the terminal device; in S740, the network device sends another portion of the SFN information (i.e., the second part of the bits) to the terminal device. For example, the second part of the bits can be MP bits excluding the P bits (i.e., the first part of the bits) in the M bits.

[0251] Taking the NR system as an example, the SFN information in the NR system can have a total of 10 bits (i.e., M = 10), thus indicating 1024 SFNs. The number of bits in the first part is P; the number of bits in the second part can be 10 - P. P can be a positive integer less than or equal to 10.

[0252] In some examples, the first information may be carried in at least one of the following signaling:

[0253] • Control information in the system information block;

[0254] • System information block;

[0255] • RAR control information;

[0256] ·RAR;

[0257] • Control information for RRC connection confirmation messages;

[0258] • RRC connection confirmation message.

[0259] For example, the system information block can indicate random access resources to the terminal device. As an example, the system information block can be SIB1 (or, the PDSCH of SIB1). As an example, the random access resources can be one or more ROs.

[0260] In future communication systems, the information indicating random access resources to terminal devices can still be called SIB1, or it can have other names. In this application, SIB1 can be replaced with or understood as information indicating random access resources to terminal devices in future communication systems. For ease of understanding, the following description uses SIB1 as an example.

[0261] For example, RAR can be Msg2 in a four-step random access procedure, MsgB in a two-step random access procedure, or a message used to respond to a preamble in a future proposed random access procedure. As an example, RAR can be understood as RARPDSCH.

[0262] For example, the RRC connection acknowledgment message can be the MsgB in a four-step random access process, or it can be a message used to resolve conflicts or respond to RRC connection request messages in a future proposed random access process. As an example, the RRC connection acknowledgment message can be understood as the RRC connection acknowledgment message PDSCH.

[0263] For example, control information for a message (e.g., SIB1, RAR, or RRC connection acknowledgment message) can be used to schedule the terminal device to receive the message. As an example, the control information can be DCI (or PDCCH). For ease of understanding, the following description uses DCI as the control information.

[0264] Below, we will introduce relevant examples of how the first information is carried in various signaling messages.

[0265] Signaling Example 1: The first information is carried on SIB1.

[0266] As an example, SIB1 can be the SIB1 corresponding to the preamble in S750. Specifically, the SIB1 corresponding to the PBCH message can be understood as the SIB1 configured by the terminal device in the PBCH message, and the SIB1 received there. For example, the terminal device performs blind detection of SIB1DCI based on the SIB1 configuration in the PBCH message; and receives SIB1 based on SIB1DCI.

[0267] In some examples, the first information may be a field added to SIB1 relative to the current protocol, which can be used to carry the second part of the SFN information bits.

[0268] Taking an SFN message with 10 bits (i.e., M=10) and P=4 as an example, the PBCH message can carry 4 bits of the LSB of the SFN message (i.e., the first part of the bits); the newly added field in the SIB1 of the PBCH message can carry the remaining 6 bits of the SFN message (i.e., the second part of the bits).

[0269] For example, the newly added field (i.e., the first information) may be called the addSFN field, the remaining SFN field, or other names. This application does not limit the specific name of the newly added field.

[0270] In other examples, the first piece of information may be a field that SIB1 already has in the current protocol, which can be modified. This modified field can be used to carry information specified by the current protocol, as well as the second set of bits.

[0271] For example, the HyperSFN-r17 field in the current protocol's SIB1 message can be modified. The modified HyperSFN-r17 field can be used to carry hyperSFN information, as well as the second part of the SFN information. Taking a 10-bit SFN information field (i.e., M=10) and P=4 as an example, the PBCH message can carry 4 bits of the SFN information's LSB; the HyperSFN-r17 field in the corresponding SIB1 of the PBCH message can occupy 16 bits. Of these, 10 bits are hyperSFN information, used to indicate hyperSFN; the remaining 6 bits are the second part of the information.

[0272] For example, the field used to carry the second part of the bits (i.e., the first information) may be one or more other fields besides the HyperSFN-r17 field, and this application does not limit it.

[0273] In some possible implementations of signaling example 1, S750 includes: the terminal device sending a preamble based on the first part of bits and the second part of bits. This preamble can be carried in Msg1 of a four-step random access method, MsgA of a two-step random access method, or in a random access message of a future proposed random access method.

[0274] Based on the first and second part of the bits, the terminal device can obtain all bits (i.e., M bits) of the SFN information, and thus can send the preamble on the corresponding random access resource based on the SFN indicated by the SFN information.

[0275] As an example, see Figure 8 In (a) of the signaling example, it is assumed that the SFN information has a total of 10 bits (i.e., M = 10). In signaling example 1, the network device can indicate the P-bit SFN information to the terminal device through the PBCH message, and then indicate the 10-P-bit SFN information to the terminal device through SIB1; the terminal device can send a preamble to the network device based on the complete SFN information.

[0276] Signaling Example 2: The first information is carried in SIB1DCI.

[0277] In some examples, the SIB1DCI can be the SIB1DCI corresponding to the PBCH message in S710. Here, the SIB1DCI corresponding to the PBCH message can be understood as the terminal device blindly detecting the SIB1DCI based on the SIB1 configuration in the PBCH message.

[0278] As an example, SIB1DCI can be understood as a DCI scrambled with system information (SI)-RNTI (SI-RNTI), and the format of this DCI can be 1_0. Or, SIB1DCI can be a DCI scrambled with SI-RNTI in format 1_0.

[0279] For example, the first information may be a field added to SIB1DCI relative to the current protocol or a field of the current protocol. For instance, SIB1DCI may include the fields shown in Table 2.

[0280] Table 2

[0281]

[0282]

[0283] Table 2 above is for illustrative purposes only. SIB1DCI may include some or all of the fields shown in Table 2, and SIB1DCI may also include other fields besides those shown in Table 2. Furthermore, the number of bits in Table 2 above can be modified, and the fields (or entries) can also be modified.

[0284] For example, the first information mentioned above may be called the remaining SFN indicator or other names, and this application does not limit the specific name of the first information mentioned above.

[0285] In some possible implementations of signaling example 2, S750 includes: the terminal device sending a preamble based on the first part of bits and the second part of bits.

[0286] Based on the first and second part of the bits, the terminal device can obtain all bits (i.e., M bits) of the SFN information, and thus can send the preamble on the corresponding random access resource based on the SFN indicated by the SFN information.

[0287] As an example, see Figure 8 In (b) of the signaling example, it is assumed that the SFN information has a total of 10 bits (i.e., M = 10). In signaling example 2, the network device can indicate the P-bit SFN information to the terminal device through the PBCH message, then indicate the 10-P-bit SFN information to the terminal device through SIB1DCI, and then send SIB1 to the terminal device; the terminal device can send a preamble to the network device based on the complete SFN information.

[0288] The preamble can be carried in Msg1 of the four-step random access method, MsgA of the two-step random access method, or in the random access message of a future proposed random access method.

[0289] Signaling Example 3: The first message is carried on RARDCI.

[0290] In some possible implementations, S750 includes: the terminal device sending a preamble to the network device based on the first part of the bits.

[0291] For example, the RARDCI in signaling example 3 can be the RAR DCI corresponding to the preamble in S750. Here, the RAR DCI corresponding to the preamble can be understood as the network device sending the RARDCI to the terminal device in response to the preamble.

[0292] In some examples, the RAR DCI can be the Msg2DCI in a four-step random access process.

[0293] As an example, Msg2DCI can be understood as a RA-RNTI scrambled DCI, and the format of this DCI can be 1_0. Or, Msg2DCI can be a RA-RNTI scrambled DCI format 1_0.

[0294] For example, the first information may be a field added to Msg2DCI relative to the current protocol or a field of the current protocol. For instance, Msg2DCI may include the fields shown in Table 3.

[0295] Table 3

[0296] Fields (Entries) Number of bits Frequency domain resource allocation variable Time-domain resource allocation 4 VRB to PRB mapping 1 MSC 5 TB scaling 2 reserve 10 First Information 6

[0297] Table 3 above is for illustrative purposes only. Msg2DCI may include some or all of the fields shown in Table 3, and may also include other fields besides those in Table 3. Furthermore, the number of bits in Table 3 above can be modified, and the fields (or entries) can also be modified.

[0298] For example, the first information mentioned above may be called the remaining SFN indicator or other names, and this application does not limit the specific name of the first information mentioned above.

[0299] In other examples, the RAR DCI can be the MsgBDCI in two-step random access.

[0300] As an example, MsgBDCI can be understood as a DCI scrambled with MsgB-RNTI, and the format of this DCI can be 1_0. Or, MsgBDCI can be a DCI scrambled with MsgB-RNTI in format 1_0.

[0301] For example, the first information may be a field added to MsgBDCI relative to the current protocol or a field of the current protocol. For instance, MsgBDCI may include the fields shown in Table 4.

[0302] Table 4

[0303] Fields (Entries) Number of bits Frequency domain resource allocation variable Time-domain resource allocation 4 VRB to PRB mapping 1 MSC 5 TB scaling 2 The least significant bit of the SFN containing the random access resource 2 reserve 8 First Information 6

[0304] Table 4 above is for illustrative purposes only. MsgBDCI may include some or all of the fields shown in Table 4, and may also include other fields besides those in Table 4. Furthermore, the number of bits in Table 4 above can be modified, as can the individual fields (or entries).

[0305] For example, the first information mentioned above may be called the remaining SFN indicator or other names, and this application does not limit the specific name of the first information mentioned above.

[0306] As an example, see Figure 8 In (c) of the signaling example, assume that the SFN information has a total of 10 bits (i.e., M = 10). In signaling example 3, the network device can indicate the P-bit SFN information to the terminal device via the PBCH message, and then send SIB1; the terminal device can send a preamble to the network device based on the P-bit SFN information (i.e., the first part of the bits); the network device can indicate the 10-P-bit SFN information to the terminal device via RARDCI, and also send RAR to the terminal device.

[0307] In the case of signaling example 3 applied to the four-step random access method, the preamble can be carried in Msg1, the RARDCI can be Msg2DCI, and the RAR can be Msg2.

[0308] In the case of signaling example 3 applied to the two-step random access method, the preamble can be carried in MsgA, the RARDCI can be MsgBDCI, and the RAR can be MsgB.

[0309] Signaling Example 4: The first message is carried in RAR.

[0310] In some possible implementations, S750 includes: the terminal device sending a preamble to the network device based on the first part of the bits.

[0311] For example, the RAR in signaling example 4 can be the RAR corresponding to the preamble in S750. Here, the RAR corresponding to the preamble can be understood as the network device sending the RAR to the terminal device based on the preamble. For instance, the network device can first send RARDCI to the terminal device based on the preamble, and then send the RAR to the terminal device.

[0312] In some examples, RAR can be Msg2 in a four-step random access.

[0313] For example, the first information can be a field added to Msg2 relative to the current protocol or a field of the current protocol. The first information can be carried in the content of Msg2. For example, Msg2 may include... Figure 9 The field shown in (a) is shown in the table.

[0314] See Figure 9 , Figure 9 The eight fence-like symbols at the top represent eight bits, each bit being associated with... Figure 9 Field alignment in [the code / framework]. For example, in [the context of the code / framework]. Figure 9 In (a), the length or size of the R field is 1 bit; the length of the logical channel identifier (LCID) field is 6 bits. Field R can represent a reserved field. The subheader field can be an octet in length. The timing advance command (TAC) field can be 7 or 6 bits in length. The UL authorization field can be 3 or 8 bits in length. The TC-RNTI field can be 8 bits in length.

[0315] For example, the first information mentioned above may be called the remaining SFN or other names, and this application does not limit the specific name of the first information mentioned above.

[0316] The above Figure 9 (a) in the example is only; Msg2 can include Figure 9 Msg2 may include some or all of the fields shown in (a) above, and may also include fields other than those shown in (a). Figure 9 Other fields besides (a) in the above. Furthermore, the above... Figure 9 The number of bits in each field in (a) can be modified, and each field can also be modified.

[0317] In other examples, RAR can be MsgB in two-step random access.

[0318] For example, the first information can be carried in the MAC protocol data unit (PDU) of the MsgB. For instance, the MACPDU can be a backoff indicator (BI) MAC subPDU, a subPDU containing a fallback RAR, a subPDU containing a success RAR, etc. Specific examples will not be listed further.

[0319] As an example, see Figure 8 In (d), it is assumed that the SFN information has a total of 10 bits (i.e., M = 10). In signaling example 4, the network device can indicate the P-bit SFN information to the terminal device through the PBCH message, and then send SIB1; the terminal device can send a preamble to the network device based on the P-bit SFN information (i.e., the first part of the bits); the network device can indicate the 10-P-bit SFN information to the terminal device through RAR.

[0320] In the case of signaling example 4 applied to the four-step random access method, the preamble can be carried in Msg1, and the RAR can be Msg2.

[0321] In the case of signaling example 4 applied to the two-step random access method, the preamble can be carried in MsgA, and the RAR can be MsgB.

[0322] Signaling Example 5: The first information is carried in the RRC Connection Acknowledgment Message (DCI).

[0323] In some possible implementations, S750 includes: the terminal device sending a preamble to the network device based on a first set of bits. This preamble may be carried as Msg1 in a four-step random access method. In response to Msg1, the network device may send a RAR to the terminal device. This RAR may be Msg2 in a four-step random access method. Based on Msg2, the terminal device may send Msg3 to the network device.

[0324] In some examples, the RRC connection acknowledgment message DCI can be the Msg4DCI corresponding to the aforementioned Msg3. The Msg4DCI corresponding to Msg3 can be understood as the network device sending the Msg4DCI to the terminal device based on Msg3.

[0325] As an example, Msg4DCI can be understood as a DCI scrambled with TC-RNTI, and the format of this DCI can be 1_0. Or, Msg4DCI can be a DCI format 1_0 scrambled with TC-RNTI.

[0326] For example, the first information may be a field added to Msg4DCI relative to the current protocol or a field of the current protocol. For instance, Msg4DCI may include the fields shown in Table 5.

[0327] Table 5

[0328]

[0329] Table 5 above is for illustrative purposes only. Msg4DCI may include some or all of the fields shown in Table 5, and may also include other fields besides those shown in Table 5. Furthermore, the number of bits in Table 5 above can be modified, and the fields (or entries) can also be modified.

[0330] For example, the first information mentioned above may be called the remaining SFN indicator or other names, and this application does not limit the specific name of the first information mentioned above.

[0331] As an example, see Figure 8 In example (e), assuming the SFN information has 10 bits (i.e., M = 10), in signaling example 5, the network device can indicate the P-bit SFN information to the terminal device via the PBCH message, and then send SIB1; the terminal device can send a preamble (or Msg1) to the network device based on the P-bit SFN information. In response to this preamble, the network device can send RAR (or Msg2) to the terminal device. Based on the RAR, the terminal device can send Msg3 to the network device. The network device can indicate the 10-P-bit SFN information to the terminal device via Msg4DCI, and also send Msg4 to the terminal device.

[0332] Signaling Example 6: The first information is carried in the RRC connection confirmation message.

[0333] In some possible implementations, S750 includes: the terminal device sending a preamble to the network device based on a first set of bits. This preamble may be carried as Msg1 in a four-step random access method. In response to Msg1, the network device may send a RAR to the terminal device. This RAR may be Msg2 in a four-step random access method. Based on Msg2, the terminal device may send Msg3 to the network device.

[0334] In some examples, the RRC connection acknowledgment message can be Msg4, which corresponds to Msg3 mentioned above. Here, Msg4, corresponding to Msg3, can be understood as the network device sending Msg4 to the terminal device based on Msg3. For example, the network device can first send Msg4DCI to the terminal device based on Msg3, and then send Msg4 to the terminal device.

[0335] For example, the first information can be a field added to Msg4 relative to the current protocol or a field of the current protocol. The first information can be carried in the content of Msg4. For example, Msg4 may include... Figure 9 The field shown in (b) is shown in the table.

[0336] For example, in Figure 9 In (b), the UE contention resolution identity field has a length or size of 48 bits or other bit count. The first information may occupy 8 bits or other bit counts.

[0337] For example, the first information mentioned above may be called the remaining SFN or other names, and this application does not limit the specific name of the first information mentioned above.

[0338] The above Figure 9 (b) in the example is only; Msg4 can include Figure 9 Msg4 may also include, except for, some or all of the fields shown in (b) above. Figure 9 Other fields besides (b) in the above. Furthermore, the above... Figure 9 The number of bits in each field in (b) can be modified, and each field can also be modified.

[0339] Based on the above signaling examples 1 to 6, after receiving the first information, the terminal device can obtain the complete SFN information (i.e., M bits) and then proceed with the subsequent process.

[0340] In other examples, the first information can be carried in multiple signaling messages. For example, the first information can be carried in SIB1DCI and SIB1, where the first information in SIB1DCI contains a portion of the second set of bits, and the first information in SIB1 contains the remaining portion of the second set of bits.

[0341] The following are some examples of configuring random access resources on network devices.

[0342] In some possible implementations, the network device configures a random access period x and an offset y for the terminal device. Within the random access period x, the terminal device can determine that a random access resource exists in a radio frame with offset y, and then transmit a preamble on that random access resource. The aforementioned random access period x can also be understood as the length x of the random access period.

[0343] Unless otherwise specified, the term "random access period" in this application can be understood as a specific random access period, or in other words, a specific time period. Thus, the length of the random access period can be understood as a duration of time.

[0344] For example, the random access period can be a PRACH period. In future communication networks, the period during which network devices configure resources for random access by terminal devices may still be called the PRACH period, or it may have other names. The PRACH period in this application can be replaced with or understood as the period during which network devices configure resources for random access by terminal devices in future communication networks. For ease of understanding, this application describes it as the period during which network devices configure resources for random access by terminal devices as the PRACH period.

[0345] If the terminal device does not obtain complete SFN information before sending the preamble, traditional methods of configuring random access resources may prevent the terminal device from determining the random access resources to use for sending the preamble. For ease of understanding, the following will explain... Figure 10 Let me introduce one possible scenario.

[0346] See Figure 10 If the first part of the bits is 3 bits, the terminal device can achieve synchronization at the level of 8 radio frames through the first part of the bits. For ease of understanding, these 8 radio frames can be referred to as radio frame #0 to radio frame #7. If the length of the PRACH period configured by the network device is greater than 8 frames (for example, the length of the PRACH period is 16 frames), the terminal device cannot determine which 8 radio frames the radio frame indicated by the offset y belongs to based on the offset y. As an example, see Figure 10 In (a), the offset y configured by the network device is 9, and the terminal device cannot determine whether the random access resource is in radio frame #1 of the first 8 radio frames or in radio frame #1 of the last 8 radio frames.

[0347] Taking a wireless frame length of 10ms as an example, Figure 10 The two sets of frames shown in (a) (each set consists of radio frames #0 to #7) can be understood as 0 to 160 ms. Figure 10 The situation shown in (a) can also be understood as follows: 3 bits of SFN information can indicate the SFN within 80ms. If the PRACH period (or the length of the PRACH period) is 160ms, the terminal device cannot distinguish whether the radio frame containing random access resources is within 0-80ms or within 80ms-160ms.

[0348] The following two examples, denoted as Configuration Example 1 and Configuration Example 2, demonstrate how improving the network device configuration enables the terminal device to determine the random access resources used to send the preamble.

[0349] Configuration Example 1:

[0350] In some possible implementations, method 700 also includes: S730a.

[0351] S730a, the network device sends second information to the terminal device. This second information can be used to indicate the first PRACH cycle. Correspondingly, the terminal device receives the second information from the network device.

[0352] The number of radio frames in the first PRACH cycle can be less than or equal to 2. P For example, if the first part of the bits is P = 3 bits, the first PRACH period can include at most 8 radio frames. Thus, in Figure 10 In the case shown in (a), the length of the PRACH period configured by the network device for the terminal device is less than or equal to 8 radio frames. Therefore, for any offset y configured by the network device, the terminal device can determine which of the 8 radio frames the offset y indicates, that is, which radio frame contains the random access resources.

[0353] In some possible implementations, the S750 includes: the terminal device sending a preamble to the network device during the first PRACH cycle.

[0354] In some examples, the second information can indicate the length x of the PRACH period. Thus, the terminal device can determine the first PRACH period to be sent for the preamble based on this length x, thereby realizing the indication of the first PRACH period by the second information. Wherein, the length x of the PRACH period indicated by the second information is less than or equal to 2. P .

[0355] For example, the second information can also indicate the offset y. In this way, the terminal device can determine to send the first PRACH period based on the length x of the PRACH period and the offset y, and based on the offset y, find the radio frame containing the random access resource in the first PRACH period, and send the preamble on the random access resource.

[0356] In some examples, the second information can indicate the PRACH configuration by carrying a PRACH configuration index, which may include the length x and offset y of the PRACH cycle, etc.

[0357] As an example, the PRACH configuration index and PRACH configuration table in the current protocol can remain unchanged. It is agreed that network devices select the PRACH configuration index within the coverage area of ​​the P-bit SFN information; that is, the length x of the PRACH period is less than or equal to 2. P The PRACH configuration index corresponds to the PRACH configuration. Further, the network device can execute S730a, that is, indicate the PRACH configuration index to the terminal device via the second information.

[0358] For example, if the first part of the bits is P = 3 bits, the network device can select a PRACH configuration index where x is less than or equal to 8, and send this PRACH configuration index to the terminal device via the second information. Taking a radio frame of 10ms as an example, the above example can also be understood as the length of the PRACH period in the PRACH configuration that the network device configures for the terminal device being less than or equal to 80ms.

[0359] As another example, based on the P bits indicated by the PBCH message, the PRACH configuration index and PRACH configuration table in the current protocol can be reorganized, removing PRACH configuration indices that exceed the coverage of the P bits of SFN information; that is, the length x of the PRACH period is greater than 2. P The PRACH configuration index corresponds to the PRACH configuration. Further, the network device can execute S730a, that is, indicate the PRACH configuration index to the terminal device via the second information.

[0360] For example, if the first part of the bits is P = 2 bits, the PRACH configuration index can include PRACH configuration indices where x is less than or equal to 4. As another example, if the first part of the bits is P = 3 bits, the PRACH configuration index can include PRACH configuration indices where x is less than or equal to 8. Yet another example, if the first part of the bits is P = 5 bits, the PRACH configuration index can include PRACH configuration indices where x is less than or equal to 32.

[0361] For example, the second information may be carried in a PRACH message, SIB1DCI, or SIB1.

[0362] The above scheme limits the length of the random access period indicated by the network device to 2. P Within this timeframe, the terminal device can determine the random access resource (SFN) for sending the preamble and then send the preamble. Even when the terminal device has not obtained complete SFN information, this scheme enables the terminal device to send the preamble.

[0363] Configuration Example 2:

[0364] In some possible implementations, method 700 also includes: S730b.

[0365] In S730b, the network device sends third information to the terminal device. This third information can be used to indicate a second PRACH cycle, a first offset, and a second offset. Correspondingly, the terminal device receives the third information from the network device.

[0366] The difference between configuration example 1 and configuration example 2 is that configuration example 2 adds a second PRACH cycle to 2. P The relationship between them is not limited, and the number of radio frames in the second PRACH cycle can be less than, equal to, or greater than 2. P .

[0367] The first offset can be the offset of the first frame (or the first radio frame) in the second PRACH period; the second offset can be the offset of the second frame (or the second radio frame) in the second PRACH period. The terminal device can send a preamble on the first frame and the second frame respectively. That is, the aforementioned S750 may include: the terminal device sending a preamble to the network device on the first frame and the second frame in the second PRACH period respectively.

[0368] In some examples, the difference between the first offset and the second offset is 2. P In other words, there can be a 2-second interval between the first frame and the second frame. P A wireless frame. For example, see Figure 10 In (b), assuming the first part of the bits is P = 3 bits, the first offset y1 can be 1, and the second offset y2 can be 9. The network device indicates the aforementioned first offset y1 and second offset y2 through the third information, which is equivalent to instructing the terminal device to offset y1 and y2 every 2 bits. P The preamble is transmitted on the second radio frame (i.e., radio frame #1) of the first eight radio frames. Thus, even if the terminal device cannot explicitly determine which eight radio frames the radio frame indicated by the first offset y1 is in, or which eight radio frames the radio frame indicated by the second offset y2 is in, the terminal device can still transmit the preamble on radio frame #1 of the first eight radio frames (i.e., the first frame) and radio frame #1 of the last eight radio frames (i.e., the second frame), thereby satisfying the network device configuration.

[0369] Taking a wireless frame length of 10ms as an example, Figure 10 The two sets of frames shown in (b) (each set consists of radio frames #0 to #7) can be understood as 0 to 160 ms. Figure 10The situation shown in (b) can also be understood as follows: the 3-bit SFN information can indicate the SFN within 80ms. If the PRACH period (or the length of the PRACH period) is 160ms, the terminal device cannot distinguish whether the radio frame containing random access resources is within 0-80ms or 80ms-160ms. However, the network device can configure the terminal device to send the preamble in both the 0-80ms and 80ms-160ms ranges using two offsets, thereby avoiding the terminal device's inability to send the preamble due to incomplete SFN information carried in the PBCH message.

[0370] The length of the second PRACH cycle is 2. P For example, twice the length of the second PRACH cycle. It's understandable that the length of the second PRACH cycle is 2... P In cases where the length is three times or more than three times, the first and second offsets can be two adjacent offsets from a plurality of offsets arranged in ascending order. For example, if the length of the second PRACH cycle is 16, 2 P =4, then the third piece of information can indicate the length of the PRACH cycle x = 16 and four offsets 1, 5, 9, and 13. The first and second offsets can be 1 and 5; or 5 and 9; or 9 and 13, respectively.

[0371] In some examples, the third information can indicate the length x of the PRACH period. Thus, the terminal device can determine the second PRACH period to be transmitted based on this length x, thereby achieving the indication of the second PRACH period by the third information.

[0372] In some examples, the third information can indicate the PRACH configuration by carrying a PRACH configuration index, which may include the length x of the PRACH cycle, a first offset y1 and a second offset y2, and so on.

[0373] In other examples, the third information can indicate the PRACH configuration by carrying a PRACH configuration index, which may include the length x of the PRACH period. The PRACH configuration may also include a first offset y1 or a second offset y2. The terminal device can calculate another offset (e.g., the second offset y2) based on one offset included in the PRACH configuration (e.g., the first offset y1) and the number of bits in the first portion (i.e., P). As an example, the terminal device can calculate based on y1 + y2 = 2... P To perform the above calculations.

[0374] Based on the above scheme, the terminal device can access the device at 2 during the random access period. PUsing radio frames as intervals, multiple random access resources are determined for transmitting the preamble, and the preamble is then transmitted. This scheme enables the terminal device to transmit the preamble even when it has not obtained complete SFN information.

[0375] This application does not limit the implementation scenarios of configuration examples 1 and 2. For example, even if the terminal device has not obtained complete SFN information, the network device and the terminal device can still execute configuration examples 1 and 2. As another example, even if the terminal device has obtained complete SFN information, the network device and the terminal device can still execute configuration examples 1 and 2.

[0376] The following is an example of how terminal devices can recognize RAR DCI.

[0377] After sending the preamble, the terminal device can monitor the RAR DCI within the RAR window. If the length of the RAR window is one radio frame, two different terminal devices can receive the RAR DCI by using the same RNTI blind detection PDCCH on different radio frames.

[0378] As an example, this application designates the terminal device in method 700 as the first terminal and another terminal device different from the first terminal as the second terminal. The first terminal can transmit a preamble on one radio frame (denoted as SFN#1); the second terminal can transmit a preamble on another radio frame (denoted as SFN#2). The RAR window of the first terminal is SFN#2, while the RAR window of the second terminal is SFN#3. Therefore, since the RAR windows of the first terminal and the second terminal do not overlap, no conflict will occur even if the first terminal and the second terminal use the same RNTI blind detection PDCCH.

[0379] Taking MsgB as an example in RAR, in Release 16, because the MsgB window (or the MsgB monitoring window) is extended from one radio frame to four radio frames, two bits are introduced into the MsgB-RNTI scrambled DCI format 1_0 (or MsgB DCI). These two bits can be the lowest two bits of the SFN where the preamble was previously transmitted by the terminal device (e.g., the first terminal or the second terminal). These two bits can indicate four SFNs, thereby avoiding collisions.

[0380] As an example, suppose the first terminal sends a preamble on SFN#1, and its RAR window can be SFN#2 to SFN#5; the second terminal sends a preamble on SFN#2, and the first terminal's RAR window can be SFN#3 to SFN#6. Thus, within SFN#3 to SFN#5, if the network device uses the same RNTI scrambling for both RARDCI#1 sent to the first terminal and RARDCI#2 sent to the second terminal, both RARDCI#1 and RARDCI#2 can be received by both the first and second terminals. That is, the first terminal may receive both RARDCI#1 and RARDCI#2; the second terminal may also receive both RARDCI#1 and RARDCI#2. By carrying the least significant two bits of SFN#1 in RARDCI#1, the first terminal can determine that RARDCI#1 was sent to the first terminal, and the second terminal can determine that RARDCI#1 was not sent to the second terminal. Accordingly, by carrying the least significant two bits of SFN#2 in RARDCI#2, the first terminal can determine that RARDCI#2 was not sent to itself, and the second terminal can determine that RARDCI#2 was sent to itself. Therefore, by carrying the least significant two bits of the SFN where the preamble was previously transmitted by the terminal device, RARDCI can, within a MsgB window of less than 40ms, enable multiple terminal devices using the same RNTI to monitor the PDCCH and sending preambles on different random access resources to identify whether the RARDCI was sent to them.

[0381] However, if the RAR (e.g., MsgB or Msg2) window continues to expand (e.g., to 16 radio frames), the above scheme, using 2 bits, makes it impossible for multiple terminal devices to identify whether the RARDCI is the one sent to them.

[0382] Figure 11 This is a schematic diagram illustrating the identification of RARDCI by multiple terminal devices according to an embodiment of this application. See also... Figure 11 Assume the first terminal sends a preamble on the preceding SFN#1; the second terminal sends a preamble on the following SFN#1. After sending the preamble, the first terminal can monitor the RARDCI on RAR window #1; after sending the preamble, the second terminal can monitor the RARDCI on RAR window #2. The lengths of RAR window #1 and RAR window #2 can be the same.

[0383] Depend on Figure 11It is evident that RAR window #1 and RAR window #2 overlap in the time domain. Assuming that during the overlapping portion, the network device broadcasts RARDCI, since the lengths of RAR window #1 and RAR window #2 exceed four radio frames, and the RARDCI carries 2 bits of SFN #1, neither the first nor the second terminal can identify whether the RARDCI is a DCI sent to itself.

[0384] The terminal device in method 700 can be referred to as the first terminal. In some possible implementations, method 700 also includes: S760.

[0385] S760, the network device sends RARDCI to the first terminal. Correspondingly, the first terminal receives the RARDCI from the network device.

[0386] The following four examples, denoted as DCI Example 1 to DCI Example 4, are presented from the perspective of the first terminal. DCI Example 1 to DCI Example 4 explain in detail how the first terminal identifies whether the RARDCI is a DCI sent to itself.

[0387] DCI Example 1:

[0388] For example, the length is 2 P The time period can be called an SFN cycle; in other words, the number of radio frames in an SFN cycle can be equal to 2. P .

[0389] In DCI Example 1, RARDCI may include indication information for the first SFN cycle. This indication information can be used to indicate the first SFN cycle. The first SFN cycle can be a specific SFN cycle; for example, the first SFN cycle can be an SFN cycle before the first terminal executes S760.

[0390] In some possible implementations, method 700 also includes: S770.

[0391] S770, the network device sends a RAR to the first terminal. Correspondingly, if the first SFN period is the SFN period in which the first terminal sends the preamble, the first terminal receives the RAR from the network device.

[0392] In other words, if the first terminal is the terminal that sends the preamble during the first SFN period, then the first terminal can receive the RAR scheduled by the DCI based on the DCI received by S760.

[0393] In some possible implementations, prior to S770, method 700 further includes: the first terminal determining whether the first SFN period is the SFN period for the first terminal to transmit the preamble. If the first SFN period is the SFN period for the first terminal to transmit the preamble, then the first terminal can execute S770, i.e., receive the RAR; if the first SFN period is not the SFN period for the first terminal to transmit the preamble, then the first terminal may not receive the RAR scheduled by the RARDCI in S760, but instead continue to monitor other RARDCIs on the RAR window.

[0394] Based on the above scheme, RARDCI can instruct a terminal device to send the first SFN period of the preamble. In this way, the first terminal can determine whether the RARDCI is its own DCI by judging whether the first SFN period is the SFN period for sending the preamble, and thus determine whether to receive the RAR scheduled by the DCI. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the above DCI example 1, by instructing a terminal device to send the first SFN period of the preamble, can enable multiple terminal devices to identify whether the RARDCI is a DCI sent to them with fewer bits, even when the RAR window is large.

[0395] In some examples, the indication information of the first SFN period can be used to indicate a third offset. This third offset can indicate the offset between the first SFN period and the SFN period that sent the RARDCI.

[0396] As an example, a third offset of 1 can indicate that the first SFN period is the SFN period preceding the one in which RARDCI was sent. See also Figure 11 The first terminal can determine that the received RARDCI is its own DCI based on the information indicating that the third offset is 1, and thus execute S770, that is, receive the RAR scheduled by the DCI.

[0397] For example, the indication information for the first SFN cycle can be called the SFN Offset Indicator or other names. For instance, the indication information for the first SFN cycle used to indicate that the third offset is equal to 1 can be represented as SFNOffsetIndicator = 1.

[0398] In some examples, RARDCI may also include the lowest two bits of the SFN where the preamble was transmitted before the first terminal. In other words, DCI example 1 can be understood as RARDCI adding indication information of the first SFN period to the original lowest two bits of the SFN.

[0399] In other examples, RARDCI may exclude the lowest two bits of the random access resource (SFN) where the preamble was transmitted before the first terminal, and this application does not limit this.

[0400] The above scheme can indicate the first SFN period with a small number of bits, saving signaling overhead.

[0401] DCI Example 2:

[0402] In some possible implementations, prior to S750, the method 700 also includes S715.

[0403] S715, the network device sends the fourth information to the first terminal. Correspondingly, the first terminal receives the fourth information from the network device.

[0404] Optionally, the fourth information can be used to instruct terminals transmitting preambles in different random access periods to use different frequency domain resource monitoring (RARDCI) methods. For example, the fourth information can instruct a terminal transmitting a preamble in a third random access period to use a first frequency domain resource monitoring (RARDCI), and instruct a terminal transmitting a preamble in a fourth random access period to use a second frequency domain resource monitoring (RARDCI).

[0405] The first frequency domain resource and the second frequency domain resource can be different. For example, the first frequency domain resource and the second frequency domain resource can be understood as two different frequency points.

[0406] The third and fourth random access periods can be different. For example, the third random access period can be a random access period before or after the fourth random access period. The length of the third random access period can be the same as or different from the length of the fourth random access period; this application does not impose any restrictions.

[0407] In some examples, the second part of the SFN information can be carried in SIB1DCI or SIB1.

[0408] In other examples, the second part of the SFN information can be carried in RARDCI, RAR, Msg4DCI, or Msg4. As an example, the DCI example 2 described above can be combined with configuration example 1. For instance, the length of the third random access period can be less than or equal to 2. P In other words, the third random access period may include less than or equal to 2 P 2 radio frames. Accordingly, the length of the fourth random access period can be less than or equal to 2. P In other words, the fourth random access period may include less than or equal to 2 P One wireless frame.

[0409] In some possible implementations, the network device may transmit the RARDCI on a first frequency domain resource, which is sent to a terminal that transmits a preamble on a third random access period. If the first terminal transmits a preamble on the third random access period, S760 includes: the first terminal receiving the RARDCI on the first frequency domain resource.

[0410] In some other possible implementations, the network device may transmit the RARDCI on the second frequency domain resources, which is sent to the terminal that transmits the preamble on the fourth random access period. If the first terminal transmits the preamble on the fourth random access period, S760 includes: the first terminal receiving the RARDCI on the second frequency domain resources.

[0411] For example, the fourth information may be carried in at least one of the following signaling methods: PBCH message, SIB1DCI, or SIB1.

[0412] By configuring the fourth information, terminal devices sending preambles on different random access cycles can use different frequency domain resources to monitor RARDCI. Correspondingly, when a network device sends RARDCI to a terminal device sending a preamble on a specific random access cycle, it can use the corresponding frequency domain resources; different random access cycles correspond to different frequency domain resources. Thus, even if the time domain unit of the actual RARDCI transmission falls within the RAR window of two terminal devices simultaneously, because these two terminal devices use different frequency domain resources to monitor RARDCI, they can identify the RARDCI sent to themselves.

[0413] Optionally, this fourth information can be used to instruct terminals transmitting preambles on different SFN periods to use different frequency domain resources to monitor RARDCI. For example, the fourth information can instruct a terminal transmitting a preamble on a first SFN period to use a first frequency domain resource to monitor RARDCI, and instruct a terminal transmitting a preamble on a second SFN period to use a second frequency domain resource to monitor RARDCI. A description of the SFN period can be found in DCI Example 1.

[0414] The first frequency domain resource and the second frequency domain resource can be different. For example, the first frequency domain resource and the second frequency domain resource can be understood as two different frequency points.

[0415] The first SFN period and the second SFN period can be different. For example, the first SFN period can be an SFN period before or after the second SFN period.

[0416] In some possible implementations, the network device may transmit a RARDCI on a first frequency domain resource, which is sent to a terminal that transmits a preamble in the first SFN period. If the first terminal transmits a preamble in the first SFN period, S760 includes: the first terminal receiving the RARDCI on the first frequency domain resource.

[0417] In some other possible implementations, the network device may transmit the RARDCI on the second frequency domain resource, which is sent to the terminal that transmits the preamble on the second SFN period. If the first terminal transmits the preamble on the second SFN period, S760 includes: the first terminal receiving the RARDCI on the second frequency domain resource.

[0418] For example, the fourth information may be carried in at least one of the following signaling methods: PBCH message, SIB1DCI, or SIB1.

[0419] By configuring the fourth information, terminal devices transmitting preambles on different SFN cycles can use different frequency domain resources to monitor RARDCI. Correspondingly, when a network device sends RARDCI to a terminal device transmitting a preamble on a specific SFN cycle, it can use the corresponding frequency domain resources; different SFN cycles correspond to different frequency domain resources. Thus, even if the actual time domain unit of the RARDCI transmission falls within the RAR windows of two terminal devices simultaneously, because these two terminal devices use different frequency domain resources to monitor RARDCI, they can identify the RARDCI sent to themselves.

[0420] DCI Example 3:

[0421] In DCI Example 3, RARDCI may include the lowest N bits of the SFN where the random access resource for the first terminal's preamble is located. Here, N is an integer greater than 2.

[0422] In some examples, N can be greater than or equal to the base-2 logarithm of the RAR window. For example, if the RAR window is 16 radio frames, N...

[0423] As an example, the aforementioned N bits can be carried in the "least significant bit of the SFN containing the random access resource" shown in Table 4. The number of bits in the "least significant bit of the SFN containing the random access resource" can be modified to N.

[0424] DCI Example 4:

[0425] In DCI Example 4, RARDCI may include indication information for the fifth random access period. This indication information can be used to indicate the fifth random access period. The fifth random access period can be a specific random access period; for example, the fifth random access period can be an SFN period before the first terminal executes S760.

[0426] In some possible implementations, method 700 also includes: S770.

[0427] S770, the network device sends a RAR to the first terminal. Correspondingly, if the fifth random access period is the random access period in which the first terminal sends the preamble, the first terminal receives the RAR from the network device.

[0428] In other words, if the first terminal is the terminal that sends the preamble during the fifth random access period, then the first terminal can receive the RAR scheduled by the DCI based on the DCI received by S760.

[0429] In some possible implementations, prior to S770, method 700 further includes: the first terminal determining whether the fifth random access period is a random access period in which the first terminal transmits a preamble. If the fifth random access period is a random access period in which the first terminal transmits a preamble, then the first terminal can execute S770, i.e., receive the RAR; if the fifth random access period is not a random access period in which the first terminal transmits a preamble, then the first terminal may not receive the RAR scheduled by the RARDCI in S760, but instead continue to monitor other RARDCIs on the RAR window.

[0430] Based on the above scheme, the RARDCI can instruct a terminal device to send the fifth random access period of the preamble. Thus, by determining whether the fifth random access period is the same random access period in which the first terminal sends the preamble, it can identify whether the RARDCI is its own DCI, and thereby determine whether to receive the RAR scheduled by that DCI. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the DCI example 4 above, by instructing a terminal device to send the fifth random access period of the preamble, can enable multiple terminal devices to identify whether the RARDCI is a DCI sent to them, even with a large RAR window, using fewer bits.

[0431] In some examples, the indication information of the fifth random access period can be used to indicate the fourth offset. This fourth offset can indicate the offset between the fifth random access period and the random access period that sent the RARDCI.

[0432] As an example, a fourth offset of 1 indicates that the fifth random access period is the previous random access period after the one that sent the RARDCI. See also Figure 11 Assuming the length x of the random access period is 8 radio frames, the first terminal can determine that the received RARDCI is its own DCI based on the information indicating that the fourth offset is 1, and thus execute S770, that is, receive the RAR scheduled by the DCI.

[0433] For example, the indication information for the fifth random access period can be called the PRACH Offset Indicator or other names. For instance, the indication information for the fifth random access period used to indicate that the fourth offset is equal to 1 can be represented as PRACHOffsetIndicator = 1.

[0434] In some examples, RARDCI may also include the lowest two bits of the SFN where the preamble of the first terminal was transmitted. In other words, DCI example 4 can be understood as RARDCI adding an indication of the fifth random access cycle to the original lowest two bits of the SFN.

[0435] In other examples, RARDCI may exclude the lowest two bits of the random access resource (SFN) where the preamble was transmitted before the first terminal, and this application does not limit this.

[0436] The above scheme can save signaling overhead by indicating the fifth random access period with a small number of bits.

[0437] Section 4 of the terminology explanation introduces Type 1 and Type 2 terminals. In future communication networks, Type 1 terminals with limited bandwidth may be used in the same scenario as Type 2 terminals with unlimited bandwidth. As an example, the initial BWP of a Type 1 terminal does not exceed QMHz; the initial BWP of a Type 2 terminal is not limited to QMHz and can be greater than QMHz.

[0438] Current solutions indicate dedicated initial uplink resources for RedCap devices in the public SIB1. The RedCap device then sends a preamble in the RO of this dedicated initial uplink resource to initiate uplink access. In these solutions, RedCap devices and normal terminal devices (i.e., terminal devices not belonging to the RedCap group) use the same specifications and larger bandwidth configuration information for access, resulting in an overall initial access bandwidth requirement of at least 20MHz. When the terminal device's operating bandwidth is limited and less than the minimum bandwidth of the current configuration information, the above solutions will not function correctly.

[0439] In some examples of method 700, PBCH messages can be received and transmitted within the first frequency band.

[0440] The width of the first frequency band can be the frequency band width supported by the first type of terminal. The width of the first frequency band can be denoted as QMHz, where QMHz can be the bandwidth supported by the first type of terminal. For example, the first frequency band can be a specific frequency band with a bandwidth of QMHz. Exemplarily, Q can be 3, 5, or other values. A description of the first type of terminal can be found above, such as in the relevant content of Section 4 of the Terminology Explanation, here.

[0441] The bandwidth supported by the first type of terminal may be smaller than that supported by the second type of terminal. For example, the bandwidth supported by the first type of terminal is QMHz; the bandwidth supported by the second type of terminal is greater than QMHz. The meaning of the second type of terminal can be found in Terminology Explanation 4, and will not be repeated here.

[0442] For example, the location of the first frequency band in the frequency domain may be specified by the protocol, configured by the network device, pre-configured in the first type of terminal or the second type of terminal, or determined by other means, and this application does not limit it.

[0443] The terminal device and the first terminal in method 700 may belong to the first type of terminal or the second type of terminal mentioned above, and this application does not limit them.

[0444] By restricting PBCH messages to the first frequency band, both Type 1 and Type 2 terminals can receive and parse these messages, thus achieving unified configuration for bandwidth-constrained Type 1 terminals and bandwidth-unconstrained Type 2 terminals. Furthermore, the PBCH message carries a portion of the SFN information; due to its smaller bit count, it can be transmitted within the bandwidth-constrained first frequency band. For ease of understanding, the following explanation... Figure 12 This section presents an example of an application scenario for Method 700.

[0445] Figure 12 This is a schematic diagram of time-frequency resources from SSB to RAR provided in an embodiment of this application. See also... Figure 12 Shaded time-frequency resources can be confined within the first frequency band. Unshaded time-frequency resources can be within the first frequency band, outside the first frequency band, or partially within and partially outside the first frequency band; this application does not impose any limitations.

[0446] In some possible scenarios, Q MHz (i.e., the bandwidth of the first frequency band) may be Figure 12The portion between the two dashed lines in the diagram. For ease of description, the channels within the first frequency band of the PBCH can be denoted as PBCH0; the channels outside the first frequency band can be denoted as PBCH1. Alternatively, a PBCH satisfying the frequency domain bandwidth within the first frequency band can be denoted as PBCH0; a PBCH satisfying the frequency domain bandwidth outside the first frequency band can be denoted as PBCH1. As an example, the aforementioned PBCH0 can be called a narrowband PBCH or other names; the aforementioned PBCH1 can be called a wideband PBCH or other names.

[0447] In some examples, the PBCH message in method 700 can be Figure 12 The complete PBCH message in the signal refers to a PBCH message that can be carried on both PBCH0 and PBCH1. In other words, the PBCH message is not limited to the first frequency band. In the example above, the network device broadcasts the SSB uniformly to terminals with various capabilities (e.g., including first-type terminals and second-type terminals). Thus, second-type terminals can receive and decode the complete PBCH message. However, the PBCH messages received by first-type terminals within Q MHz are essentially punctured PBCH messages, resulting in poor decoding performance, which may affect the access performance of first-type terminals. Furthermore, for the communication system, the PBCH message is transmitted after encoding. The portion transmitted within Q MHz (i.e., PBCH0) and the portion transmitted outside Q MHz (i.e., PBCH1) constitute the complete codeword of the encoded PBCH message. In other words, the PBCH messages within Q MHz (i.e., PBCH0) and outside Q MHz (i.e., PBCH1) carry the same payload.

[0448] As an example, the aforementioned PBCH message can be carried in an SSB, and the time-frequency resources of the PBCH message can be as follows: Figure 12 As shown. Alternatively, PBCH messages can be carried in an SSB, and the time-frequency resources of PBCH messages are not limited to... Figure 12 In some other examples, the PBCH message may be carried in signals other than the SSB, and this application does not limit the time-frequency resources of the PBCH message.

[0449] In the example above, PBCH0 and PBCH1, as a whole, carry the complete PBCH message. The bandwidth of the PBCH message in this example is similar to that of a traditional PBCH message.

[0450] In other examples, the PBCH message of method 700 can be a portion within the first frequency band, i.e., the message carried on PBCH0 (referred to as the "PBCH0 message"). In the above examples, the bandwidth of the PBCH0 message can be limited to Q MHz.

[0451] This application does not limit the relative position of the time-frequency resources of PBCH0 and PBCH1. For example, PBCH0 and PBCH1 can be continuous in the frequency domain, and PBCH1 can use fewer time-domain resources (e.g., fewer symbols) than PBCH0. Alternatively, PBCH0 and PBCH1 can use exactly the same time-domain resources. Yet another example is that PBCH0 can use more time-domain resources than PBCH1. Still another example is that PBCH0 and PBCH1 can be discontinuous in the frequency domain (or, in other words, separated). Further details will not be elaborated upon below.

[0452] As an example, data carried on PBCH0 (e.g., a message or information) can be referred to as PBCH0 message (or PBCH0 data, or PBCH0 information). Data carried on PBCH1 (e.g., a message or information) can be referred to as PBCH1 message (or PBCH1 data, or PBCH1 information).

[0453] The bandwidth of the first frequency band can be QMHz. This allows the first type of terminal to receive the complete PBCH0 message, thus improving decoding performance. The second type of terminal can receive PBCH0 messages within QMHz, as well as PBCH1 messages outside QMHz, thereby obtaining more configuration information.

[0454] For example, see Figure 12 The PBCH0 message can be used to determine SIB1_0. For example, the PBCH0 message can be used to detect SIB1_0DCI, and SIB1_0DCI can be used to schedule the terminal device to receive SIB1_0. For example, PBCH0 can indicate the common search space (CSS) of SIB1_0DCI, and the control resource set (CORESET) corresponding to the CSS. In this way, the terminal device can blindly detect SIB1_0DCI based on the CSS and the corresponding CORESET.

[0455] As an example, SIB1_0 can be SIB1 (or, the PDSCH of SIB1). As an example, SIB1_0DCI can be the DCI of SIB1 (or, the PDCCH of SIB1). As an example, SIB1_0 can be called narrowband SIB1 or other names; SIB1_0DCI can be called narrowband SIB1DCI or other names.

[0456] For example, see Figure 12The PBCH1 message can be used to determine SIB1_1. For example, the PBCH1 message can be used to detect SIB1_1DCI, and SIB1_1DCI can be used to schedule the terminal device to receive SIB1_1. For example, PBCH1 can indicate the CSS of SIB1_1DCI and the corresponding CORESET. In this way, the terminal device can blindly detect SIB1_1DCI based on the CSS and the corresponding CORESET.

[0457] As an example, SIB1_1 can be SIB1 (or, the PDSCH of SIB1). Alternatively, SIB1_1 can be other than SIB2. As an example, SIB1_1DCI can be the DCI of SIB1 (or, the PDCCH of SIB1). As an example, SIB1_1 can be called Broadband SIB1 or other names; SIB1_1DCI can be called Broadband SIB1DCI or other names.

[0458] See in some examples Figure 12 SIB1_0 is used to indicate a first random access configuration. This first random access configuration can be used for random access by a first type of terminal and / or a second type of terminal within a first frequency band. SIB1_1 can be used to indicate a second random access configuration. For example, this second random access configuration can be used for random access by a second type of terminal.

[0459] For example, the first random access configuration may be used to indicate (e.g., include) at least one of the following: a first random access resource, the association between an SSB and a RO, or the configuration of a preamble (e.g., including the format of the preamble), etc. As an example, the first random access resource may be a PRACH resource (e.g., including a RO). For example, the aforementioned first random access resource may be located within a first frequency band, thereby enabling the terminal device to perform random access based on the first random access resource within the first frequency band.

[0460] For example, the second random access configuration can be used to indicate (e.g., include) at least one of the following: a second random access resource, the association between an SSB and a RO, or the configuration of a preamble (e.g., including the format of the preamble), etc. As an example, the second random access resource can be a PRACH resource (e.g., including a RO). For example, the aforementioned second random access resource can be located within the first frequency band, or outside the first frequency band, or partially within and partially outside the first frequency band; this application does not impose any limitations.

[0461] For example, see Figure 12 The first random access resource in the first random access configuration is Figure 12The "RO 0" marked in shaded text is shown; the second random access resource in the second random access configuration is... Figure 12 It is shown as “RO 1” without the shaded marking.

[0462] It is understandable that the above Figure 12 This is an example for ease of understanding. The application scenarios of this application are not limited to the above scenarios. For example, SIB1_0 can be used to indicate a first random access configuration and a second random access configuration. The first random access configuration can be used for random access by a first type of terminal within a first frequency band. The second random access configuration can be used for random access by a second type of terminal. The second type of terminal can perform random access within the first frequency band, or random access outside the first frequency band, or random access partially within the first frequency band and partially outside the first frequency band.

[0463] As an example, a terminal device (e.g., a Type 1 or Type 2 terminal) can send a preamble on RO 0. After receiving the preamble, the network device can send RAR 0 to the terminal device.

[0464] As an example, the second type of terminal can send a preamble on RO 1. After receiving the preamble, the network device can send RAR 1 to the second type of terminal.

[0465] The random access procedure within the first frequency band, i.e., the procedure by which a terminal device (e.g., a first-type terminal or a second-type terminal) performs random access via PBCH0 messages, SIB1_0, RO 0, and RAR 0, can be referred to as the kernel RACH procedure or other names.

[0466] The above combination Figures 7 to 12 The first communication method provided by the embodiments of this application was introduced. The second communication method provided by the embodiments of this application is described below. This communication method can enable a first terminal to effectively identify whether the RARDCI is a DCI sent to itself using a small number of bits.

[0467] Figure 13 This is a schematic flowchart of another communication method 800 provided in this application embodiment. For a description of the nodes involved in method 800, please refer to the description of the nodes in method 700, which will not be repeated here. Method 800 is described using the example of a first device as a first terminal and a second device as a network device. The following description, in conjunction with… Figure 13 This section introduces the various operations of method 800.

[0468] S810, the network device sends a PBCH message to the first terminal. Correspondingly, the first terminal receives the PBCH message from the network device.

[0469] The PBCH message may include P bits, where P is a positive integer, and these P bits may be part of the SFN information. Further descriptions of the PBCH message can be found in the descriptions of the PBCH message in method 700, such as S710 and S720, and will not be repeated here.

[0470] In S820, the network device sends a RARDCI to the first terminal. Correspondingly, the first terminal receives the RARDCI from the network device.

[0471] The aforementioned RARDCI may include indication information for the first SFN period. The number of radio frames in this first SFN period is equal to 2. P For details regarding the various terms and other related descriptions in S820, please refer to the description of DCI Example 1 in S760, which will not be repeated here.

[0472] S830, the network device sends a RAR to the first terminal. Correspondingly, if the first SFN period is the SFN period in which the first terminal sends the preamble, the first terminal receives the RAR.

[0473] For example, if the first terminal is the terminal that sends the preamble during the first SFN period, then the first terminal executes S830.

[0474] For the various terms and other related descriptions in S830 above, please refer to the description in S770 of DCI Example 1, which will not be repeated here.

[0475] Furthermore, method 800 can also be combined with some implementations of method 700. For example, method 800 may include at least one of the following: S715, S730a, S730b, S740, or S750. See the relevant descriptions in method 700 for details. As another example, the PBCH message in method 800 may be transmitted or received within a first frequency band; see [link to relevant documentation] for details. Figure 12 Related descriptions.

[0476] Based on the above scheme, RARDCI can instruct a terminal device to send the first SFN period of the preamble. In this way, the first terminal can determine whether the RARDCI is its own DCI by judging whether the first SFN period is the SFN period for sending the preamble, and thus determine whether to receive the RAR scheduled by the DCI. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the above DCI example 1, by instructing a terminal device to send the first SFN period of the preamble, can enable multiple terminal devices to identify whether the RARDCI is a DCI sent to them with fewer bits, even when the RAR window is large.

[0477] The following describes a third communication method provided in the embodiments of this application. This communication method can enable the first terminal to effectively identify whether the RARDCI is a DCI sent to itself using a small number of bits.

[0478] Figure 14 This is a schematic flowchart of another communication method 900 provided in this application embodiment. For a description of the nodes involved in method 900, please refer to the description of the nodes in method 700, which will not be repeated here. Method 900 is described using the example of a first device as a first terminal and a second device as a network device. The following description, in conjunction with… Figure 14 This section introduces the various operations of method 900.

[0479] S910, the network device sends RARDCI to the first terminal. Correspondingly, the first terminal receives RARDCI from the network device.

[0480] The RARDCI may include indication information for the fifth random access cycle. For the various terms and other related descriptions in S910 above, please refer to the description of DCI Example 4 in S760; further details will not be repeated here.

[0481] S920, the network device sends a RAR to the first terminal. Correspondingly, if the fifth random access period is the random access period in which the first terminal sends the preamble, the first terminal receives the RAR from the network device.

[0482] For example, if the first terminal is a terminal that sends a preamble during the fifth random access period, then the first terminal executes S920.

[0483] For the various terms and other related descriptions in S920 above, please refer to the description in S770 of DCI Example 4, which will not be repeated here.

[0484] Furthermore, method 900 can also be combined with some implementations of method 700. For example, method 900 may include at least one of the following: S710, S715, S720, S730a, S730b, S740, or S750. See the relevant descriptions in method 700 for details. As another example, the PBCH message in method 900 may be transmitted or received within a first frequency band; see [link to relevant documentation] for details. Figure 12 Related descriptions.

[0485] Based on the above scheme, the RARDCI can instruct a terminal device to send the fifth random access period of the preamble. Thus, by determining whether the fifth random access period is the same random access period in which the first terminal sends the preamble, it can identify whether the RARDCI is its own DCI, and thereby determine whether to receive the RAR scheduled by that DCI. Compared to the scheme of instructing a terminal device to send a radio frame containing the preamble, the DCI example 4 above, by instructing a terminal device to send the fifth random access period of the preamble, can enable multiple terminal devices to identify whether the RARDCI is a DCI sent to them, even with a large RAR window, using fewer bits.

[0486] The following, combined with Figures 15 to 18 This application provides a detailed description of the communication device provided in the embodiments. The descriptions of the device embodiments correspond to the descriptions of the method embodiments; therefore, for content not described in detail, please refer to the above method embodiments. For the sake of brevity, some content will not be repeated.

[0487] This application embodiment can divide the communication device into functional modules according to the above method example. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware, software, or a combination of both. The module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation. The following description uses the division of functional modules according to each function as an example.

[0488] Figure 15 This is an exemplary block diagram of the communication device 10 provided in the embodiments of this application.

[0489] like Figure 15 As shown, for example, the communication device 10 may include a chip system 110, a memory 120, a bus 130, a power management module 140, or a transceiver 150, etc.

[0490] The chip system 110 can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed through integrated logic circuits in the hardware of the chip system 110 or through software instructions.

[0491] By way of example and not limitation, chip system 110 may include circuitry or chips responsible for signal processing (such as a modem chip, also known as a baseband chip, or a system-on-chip (SoC) chip or system-in-package (SIP) chip containing a modem core).

[0492] Optionally, the chip system 110 may also include a memory (such as a cache) for storing instructions and data. In some embodiments, the memory in the chip system 110 is a cache memory. This memory can store instructions or data that the chip system 110 has just used or that are used repeatedly. If the chip system 110 needs to use the instruction or data again, it can retrieve it directly from this memory. This avoids repeated accesses, reduces the waiting time of the chip system 110, and thus improves the efficiency of the system.

[0493] In some embodiments, the chip system 110 may include one or more interfaces. Interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0494] The memory 120 may include random access memory (RAM) and read-only memory (ROM). The memory 120 may store computer-readable and computer-executable code, including instructions that, when executed, cause the processor to perform the various functions of this application.

[0495] Optionally, the code may include instructions for implementing various aspects of the embodiments of this application, such as instructions for performing random access. The code may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, the code may not be directly executable by the chip system 110, but may enable a computer (e.g., at compile and execution time) to perform the functions of this application. In some cases, memory 120 may contain a basic I / O system that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0496] For example, the chip system 110 executes various functional applications and data processing of the communication device 10 by running instructions stored in the memory 120. For instance, when the communication device 10 transfers files with other devices (which may also be terminals or access network devices), the chip system 110 of the communication device 10 can call the computer-executable program code stored in the memory 120 to implement the communication method provided in the embodiments of this application.

[0497] In addition, the memory 120 can be integrated into the chip system 110 or independent of the chip system 110.

[0498] For example, bus 130 may be USB, used to support communication between various parts of communication device 10.

[0499] The power management module 140 is used to receive charging input from the charger. Optionally, the power management module 140 can also supply power to the communication device 10 while charging it (e.g., the battery module of the communication device 10). By way of example and not limitation, the power management module 140 can also supply power to other devices besides the communication device 10.

[0500] Transceiver 150 can communicate bidirectionally via one or more antennas, wired links, or wireless links. For example, transceiver 150 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 150 may also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna. Transceiver 150 may include a receiver and a transmitter, the receiver performing the function of receiving information and the transmitter performing the function of transmitting information.

[0501] In some cases, a wireless device may include a single antenna. However, in other cases, a device may have more than one antenna, such as... Figure 15 Antennas 1 and 2 shown may be capable of simultaneously transmitting or receiving multiple wireless transmissions. Exemplarily, antennas 1 and 2 are used to transmit and receive electromagnetic wave signals. Each antenna in communication device 10 can be used to cover one or more communication frequency bands. Different antennas can also be multiplexed to improve antenna utilization. For example, antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antennas can be used in conjunction with a tuning switch. Communication device 10 can transfer files to other devices via wireless communication functions.

[0502] In one design, the communication device 10 may correspond to the first device in the above method embodiment.

[0503] The device 10 can implement the steps or processes corresponding to those performed by the first device in the above method embodiments. The transceiver 150 can be used to perform transmission and reception related operations of the first device in the above method embodiments, such as performing step S720 in the above method embodiments. The chip system 110 can be used to perform processing related operations of the first device in the above method embodiments.

[0504] In another design, the communication device 10 may correspond to the second device in the above method embodiment.

[0505] The device 10 can implement the steps or processes corresponding to those performed by the second device in the above method embodiments. The transceiver 150 can be used to perform transmission and reception related operations of the second device in the above method embodiments, such as performing step S720 in the above method embodiments. The chip system 110 can be used to perform processing related operations of the second device in the above method embodiments.

[0506] In a design where the communication device 10 corresponds to a second device (e.g., a terminal device), the communication device 10 may include, for example: Figure 15 The short-range communication module 164, sensor 161, display 162, or camera 163 shown are examples of such modules.

[0507] The short-range communication module 164 may include modules that support short-range communication, such as Wi-Fi and Bluetooth.

[0508] For example, sensor 161 may include pressure sensor, gyroscope sensor, barometric pressure sensor, magnetic sensor, accelerometer, distance sensor, proximity sensor, fingerprint sensor, temperature sensor, touch sensor, ambient light sensor, bone conduction sensor, etc.

[0509] For example, display 162 is used to display images, videos, etc. The display includes a display panel. The display panel may be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a mini light-emitting diode (LED), a microLED, a microOLED, a quantum dot light-emitting diode (QLED), etc. For example, in this embodiment, the display can be used to display the interface required by the communication device 10. For example, the communication device 10 implements display functions through a graphics processing unit (GPU), a display, and an application processor. The GPU is a microprocessor for image processing, connected to the display and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The chip system 110 may include one or more GPUs that execute program instructions to generate or modify display information.

[0510] For example, camera 163 is used to acquire images, videos, etc.

[0511] Understandable, Figure 15 The structure shown does not constitute a specific limitation on the communication device 10. The specific structure of the terminal equipment and / or access network equipment can be referred to Figure 15 As shown. In some embodiments, the communication device 10 may also include a... Figure 15 This could mean having more or fewer components, combining some components, separating some components, or having different component arrangements. Or, Figure 15 Some of the components shown can be implemented in hardware, software, or a combination of software and hardware. Terminal devices and / or access network devices can be implemented in… Figure 15 The components were added or removed based on the given structure.

[0512] Figure 16 This is a schematic block diagram of the communication device 20 provided in the embodiments of this application.

[0513] like Figure 16As shown, the communication device 20 may include a baseband unit 210, which can communicate with external devices via a cellular radio frequency (RF) transceiver 220 (e.g., if the communication device 20 is a terminal device, the baseband unit 210 can communicate with access network devices via the cellular RF transceiver 220; or, if the communication device 20 is an access network device, the baseband unit 210 can communicate with terminal devices and / or core network devices via the cellular RF transceiver 220).

[0514] Exemplarily, baseband unit 210 may include a computer-readable medium / memory. Baseband unit 210 may be responsible for general processing, including the execution of software stored on the computer-readable medium / memory. When executed by baseband unit 304, the software causes baseband unit 210 to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by baseband unit 210 during software execution.

[0515] Optionally, the baseband unit 210 further includes a receiving unit 201, a management unit 202, and a transmitting unit 203. When the communication device 20 is used to implement the functions of the first device, the management unit 202 includes one or more of these components. Figure 16 The sub-units shown are as follows. For example, a random access sub-unit, wherein the generation sub-unit can be used for the random access operation in the above method embodiments. The units within the management unit 201 can be stored in a computer-readable medium / memory and / or configured as hardware within the baseband unit 210. The management unit 201 can also be referred to as a processing unit. The receiving unit 201 and the transmitting unit 203 can be referred to as transceiver units.

[0516] When the communication device 20 is used to implement the function of the first device in the above method embodiments, the receiving unit 201 is used to execute the receiving step of the first device, the sending unit 203 is used to execute the sending step of the first device, and the management unit 202 is used to execute the processing step of the first device.

[0517] For example, when the communication device 20 is used to implement the function of the first device in the above method embodiments, the receiving unit 201 is used to receive a physical broadcast channel message, wherein the physical broadcast channel message includes a first part of the system frame number information bits; the management unit 202 is used to perform random access based on the first part of the bits.

[0518] For example, when the device 20 is used to perform Figure 7 , Figure 13 or Figure 14When the method is in use, the receiving unit 201 can be used to execute the step of receiving information in the method; the management unit 202 can be used to execute the processing step in the method; and the sending unit 203 can be used to execute the step of sending information in the method.

[0519] When the communication device 20 is used to implement the function of the second device in the above method embodiments, the receiving unit 201 is used to execute the receiving step of the second device, the sending unit 203 is used to execute the sending step of the second device, and the management unit 202 is used to execute the processing step of the second device.

[0520] For example, when the communication device 20 is used to implement the function of the second device in the above method embodiments, the management unit 202 is used to generate a physical broadcast channel message, wherein the physical broadcast channel message includes a first part of the system frame number information bits; and the sending unit 203 is used to send the physical broadcast channel message.

[0521] For example, when the device 20 is used to perform Figure 7 , Figure 13 or Figure 14 When the method is in use, the receiving unit 201 can be used to execute the step of receiving information in the method; the management unit 202 can be used to execute the processing step in the method; and the sending unit 203 can be used to execute the step of sending information in the method.

[0522] For a more detailed description of the receiving unit 201, management unit 202 and sending unit 203, please refer to the relevant descriptions in the above method embodiments, which will not be repeated here.

[0523] As an example and not a limitation, the chip system in this application is as follows: Figure 17 As shown, Figure 17 This is a schematic block diagram of the chip system 30 provided in the embodiments of this application. The chip system includes, but is not limited to, a modem chip, also known as a baseband chip, or a system-on-chip (SoC) chip or system-in-package (SIP) chip containing a modem core.

[0524] from Figure 17 As can be seen, the chip system (or processing system) includes a processor 310 and an input / output interface 330.

[0525] The processor 310 can be a processing circuit in a chip system (including at least one processor core, such as...). Figure 17(Shown as processor core 1 and processor core 2, etc.). Optionally, processor 310 can be coupled to memory 320 to call instructions in memory 320, enabling the chip system to implement the methods and functions of the various embodiments of this application. Input / output interface 330 can be an input / output circuit in the chip system, outputting information processed by the chip system, or inputting data or signaling information to be processed into the chip system for processing.

[0526] As one approach, the chip system is used to implement the operations performed by the first or second device in the various method embodiments described above.

[0527] For example, processor 310 is used to implement the processing-related operations performed by the first device or the second device in the above method embodiments, as described in the foregoing embodiments; input / output interface 330 is used to implement the sending and / or receiving-related operations performed by the first device or the second device in the above method embodiments, as described in the foregoing embodiments.

[0528] As an example and not a limitation, the chip system in this application is as follows: Figure 18 As shown, Figure 18 This is a schematic block diagram of the chip system 40 provided in an embodiment of this application.

[0529] from Figure 18 As can be seen, the chip system (or processing system) includes an input / output interface 410 and logic circuits 420. The input / output interface 410 can be an input / output circuit within the chip system, outputting processed information or inputting data or signaling information to be processed into the chip system for processing. For details, please refer to the description in the foregoing embodiments, for example, performing... Figure 7 , Figure 13 or Figure 14 The embodiment described above; the logic circuit 420 is used to execute the communication method described above, and can be referred to the description in the foregoing embodiment for details.

[0530] As one approach, the chip system is used to implement the operations performed by the first or second device in the various method embodiments described above.

[0531] For example, logic circuit 420 is used to implement processing-related operations performed by the first device or the second device in the above method embodiments; input / output interface 410 is used to implement sending and / or receiving-related operations performed by the first device or the second device in the above method embodiments.

[0532] This application also provides a computer-readable storage medium storing computer instructions for implementing the methods executed by the device in the above-described method embodiments.

[0533] For example, when the computer program is executed by a computer, it enables the computer to implement the methods performed by the first or second device in the various embodiments of the above methods.

[0534] This application also provides a computer program product comprising instructions which, when executed by a computer, implement the methods performed by the first or second device in the above-described method embodiments.

[0535] This application also provides a communication system, including the aforementioned first device and second device.

[0536] The explanations and beneficial effects of the relevant contents in any of the devices provided above can be found in the corresponding method embodiments provided above, and will not be repeated here.

[0537] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0538] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0539] In the several embodiments provided in this application, the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0540] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0541] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0542] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A communication method, characterized in that, include: Receive a physical broadcast channel message, wherein the physical broadcast channel message includes a first part of the system frame number information bits; Random access is performed based on the first set of bits.

2. The method according to claim 1, characterized in that, The system frame number information has M bits, where M is a positive integer, and the first part of the bits has P bits, where P is a positive integer less than M.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Receive first information, the first information including the second part of the system frame number information bits, the first information being carried in at least one of the following signaling: control information of system information block, system information block, control information of random access response, random access response, control information of radio resource control connection confirmation message, or radio resource control connection confirmation message.

4. The method according to claim 3, characterized in that, The first information is carried in the control information of the system information block and / or the system information block itself; The random access process includes: Based on the first part of the bits and the second part of the bits of the system frame number information, a preamble is sent.

5. The method according to any one of claims 1 to 4, characterized in that, The first part consists of P bits, where P is a positive integer; Prior to the random access procedure, the method further includes: Receive second information, the second information being used to indicate a first random access period, wherein the number of radio frames in the first random access period is less than or equal to 2. P ; The random access process includes: During the first random access period, a preamble is sent.

6. The method according to any one of claims 1 to 4, characterized in that, The first part consists of P bits, where P is a positive integer; Prior to the random access procedure, the method further includes: Receive third information, which indicates a second random access period, a first offset, and a second offset, wherein the difference between the first offset and the second offset is 2. P ; The random access process includes: Preambles are transmitted on the first frame and the second frame within the second random access period, respectively. The offset of the first frame within the second random access period is the first offset, and the offset of the second frame within the second random access period is the second offset.

7. The method according to any one of claims 1 to 6, characterized in that, The method is applied to a first terminal, where the first portion of bits is P bits, and P is a positive integer. After the random access is performed, the method further includes: The system receives control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P ; When the first system frame number period is the same as the system frame number period in which the first terminal sends the preamble, the random access response is received.

8. The method according to claim 7, characterized in that, The indication information of the first system frame number period is used to indicate the third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

9. The method according to any one of claims 1 to 6, characterized in that, The method further includes: The system receives fourth information, which is control information for instructing a terminal that sends a preamble in the third random access period to use a first frequency domain resource to monitor the random access response, and control information for instructing a terminal that sends a preamble in the fourth random access period to use a second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

10. The method according to any one of claims 1 to 9, characterized in that, The physical broadcast channel message is received within a first frequency band, the width of which is the frequency band width supported by a first type of terminal, and the frequency band width supported by the first type of terminal is smaller than the frequency band width supported by a second type of terminal.

11. A communication method, characterized in that, include: Generate a physical broadcast channel message, wherein the physical broadcast channel message includes a first part of the system frame number information bits; Send the physical broadcast channel message.

12. The method according to claim 11, characterized in that, The system frame number information has M bits, where M is a positive integer, and the first part of the bits has P bits, where P is a positive integer less than M.

13. The method according to claim 11 or 12, characterized in that, The method further includes: Send first information, the first information including the second part of the system frame number information bits, the first information being carried in at least one of the following signaling: control information of system information block, system information block, control information of random access response, random access response, control information of radio resource control connection confirmation message, or radio resource control connection confirmation message.

14. The method according to any one of claims 11 to 13, characterized in that, The first part consists of P bits, where P is a positive integer; The method further includes: Send a second message, the second message being used to indicate a first random access period, wherein the number of radio frames in the first random access period is less than or equal to 2. P .

15. The method according to any one of claims 11 to 13, characterized in that, The first part consists of P bits, where P is a positive integer; The method further includes: Send a third message, which indicates a second random access period, a first offset, and a second offset, wherein the difference between the first offset and the second offset is 2. P In this process, the first frame and the second frame within the second random access period are both used to send a preamble. The offset of the first frame within the second random access period is the first offset, and the offset of the second frame within the second random access period is the second offset.

16. The method according to any one of claims 11 to 15, characterized in that, The first part of the bits consists of P bits, where P is a positive integer. The method further includes: The system sends control information for a random access response, wherein the control information for the random access response includes indication information for a first system frame number period, wherein the number of radio frames in the first system frame number period is equal to 2. P ; The random access response is sent to a first terminal, which is the terminal that sends the preamble within the first system frame number period.

17. The method according to claim 16, characterized in that, The indication information of the first system frame number period is used to indicate the third offset, which indicates the offset between the first system frame number period and the system frame number period that sends the control information of the random access response.

18. The method according to any one of claims 11 to 15, characterized in that, The method further includes: Send a fourth message, which is control information for instructing the terminal that sends a preamble in the third random access period to use the first frequency domain resource to monitor the random access response, and control information for instructing the terminal that sends a preamble in the fourth random access period to use the second frequency domain resource to monitor the random access response, wherein the first frequency domain resource and the second frequency domain resource are different.

19. The method according to any one of claims 11 to 18, characterized in that, The physical broadcast channel message is transmitted within a first frequency band, the width of which is the frequency band width supported by a first type of terminal, and the frequency band width supported by the first type of terminal is smaller than the frequency band width supported by a second type of terminal.

20. A communication device, characterized in that, It includes at least one module or at least one unit, said at least one module or said at least one unit being used to perform the method of any one of claims 1 to 19.

21. A communication device, characterized in that, include: At least one processor, the at least one processor being configured to execute a computer program or instructions to cause the method of any one of claims 1 to 19 to be performed.

22. The communication device according to claim 21, characterized in that, The communication device further includes a memory for storing the computer program or the instructions.

23. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program or instructions, and when the computer program or instructions are run, the method of any one of claims 1 to 19 is performed.

24. A computer program product, characterized in that, Includes a computer program or instructions, which, when executed, implement the method as described in any one of claims 1 to 19.

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