Random access resource selection method and communication device

Abstract

This application provides a random access resource selection method and a communication device for selecting a random access resource for an enhanced reduced-capability terminal, which may be applied to a communication system. The method includes: a terminal device determines a first random access resource and sends a message 1 to a network device on the first random access resource. The terminal device is an enhanced reduced-capability first-type terminal, and the first random access resource includes a random access resource of a second-type terminal or a random access resource of a third-type terminal. The second-type terminal is a reduced-capability terminal, and the third-type terminal is a non-reduced-capability terminal, the random access resource of the second-type terminal is used by the second-type terminal for random access to the network device, and the random access resource of the third-type terminal is used by the third-type terminal for random access to the network device, and the message 1 is used by the terminal device for random access to the network device.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to Chinese Patent Application No. 202310165219.6, entitled "RANDOM ACCESS RESOURCE SELECTION METHOD AND COMMUNICATION APPARATUS," filed with the State Intellectual Property Office of the People's Republic of China on February 16, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 202310544153.1, entitled "RANDOM ACCESS RESOURCE SELECTION METHOD AND COMMUNICATION APPARATUS," filed with the State Intellectual Property Office of the People's Republic of China on May 12, 2023, the entire contents of which are incorporated herein by reference.

[0003] This application claims priority to Chinese Patent Application No. 202311010441.5, entitled "RANDOM ACCESS RESOURCE SELECTION METHOD AND COMMUNICATION APPARATUS," filed with the State Intellectual Property Office of the People's Republic of China on August 10, 2023, the entire contents of which are incorporated herein by reference.

[0004] [Technical field] This application relates to the field of communications, and in particular to a random access resource selection method and a communications device. [Background technology]

[0005] In a wireless communication protocol, reduced-capability terminals and non-reduced-capability terminals (which may also be referred to as legacy terminals) are defined. A reduced-capability terminal may perform random access by transmitting Message 1 on a random access resource configured for the reduced-capability terminal, for example, a reduced capability specific message 1 (RedCap Msg1) resource defined in protocol release 17 (R17). A non-reduced-capability terminal may perform random access on a random access resource for the non-reduced-capability terminal. Protocol release 18 (R18) proposes an enhanced reduced-capability terminal. However, R18 does not define a resource for transmitting Message 1. How to select a resource for transmitting Message 1 to realize random access for the enhanced reduced-capability terminal is an urgent problem to be solved. Summary of the Invention

[0006] The embodiments of this application provide a random access resource selection method and a communication device for realizing random access for an enhanced reduced-capability terminal.

[0007] To achieve the above objectives, this application uses the following technical solutions:

[0008] According to a first aspect, a random access resource selection method is provided. The random access resource selection method includes: a terminal device determines a first random access resource; the terminal device is an enhanced, reduced-capability first-type terminal, and the first random access resource includes a random access resource of a second-type terminal or a random access resource of a third-type terminal; the second-type terminal is a reduced-capability terminal, and the third-type terminal is a non-reduced-capability terminal, and the random access resource of the second-type terminal is used by the second-type terminal for random access to the network device, and the random access resource of the third-type terminal is used by the third-type terminal for random access to the network device; the terminal device transmits a message 1 to the network device on the first random access resource; the message 1 is used by the terminal device for random access to the network device.

[0009] According to the access control method provided in the first aspect, a terminal device may determine a first random access resource, where the terminal device is an enhanced capacity reduced first type terminal, the first random access resource is a second type terminal random access resource or a third type terminal random access resource, and the terminal device transmits message 1 on the first random access resource. Message 1 is used by the terminal device for random access to the network device. In this way, when the random access resource of the first type terminal is not configured, the random access resource of the second type terminal or the random access resource of the third type terminal may be used to transmit message 1 to realize random access of the first type terminal.

[0010] In a possible design solution, determining a first random access resource by the terminal device may include: when a random access resource of a first type terminal is not configured for the terminal device, the terminal device determines a first random access resource, the random access resource of the first type terminal is used by the first type terminal to access the network device.

[0011] In a possible design solution, determining the first random access resource by the terminal device may include: when a random access resource of a second type terminal is configured for the terminal device, the terminal device determines the random access resource of the second type terminal as the first random access resource. In this way, when a random access resource of the second type terminal and a random access resource of a third type terminal are configured for the terminal device, message 1 is transmitted by using the random access resource of the second type terminal, thereby reducing overhead.

[0012] In a possible design solution, the random access resource is a random access resource for transmitting Message 1, and determining the first random access resource by the terminal device may include: when a random access resource used by a first type terminal to transmit Message 1 is not configured, the terminal device determines a random access resource used by a second type terminal to transmit Message 1 as the first random access resource.

[0013] When a random access resource of a second type terminal and a random access resource of a third type terminal are configured for a terminal device, the priority of the random access resource of the second type terminal may be higher than the priority of the random access resource of the third type terminal.

[0014] For example, the random access resources of the second type terminals and the random access resources of the third type terminals may be included in the same bandwidth portion BWP.

[0015] Optionally, the method provided in the first aspect may further include: the terminal device receives a system message 1 from a network device, the system message 1 indicating a first random access resource.

[0016] For example, the random access resources of the second type terminal and the random access resources of the third type terminal may be included in different BWPs.

[0017] In a possible design solution, a third-type terminal random access resource may be configured for the terminal device. Determining the first random access resource by the terminal device may include: when the first-type terminal random access resource and the second-type terminal random access resource are not configured for the terminal device, the terminal device determines the third-type terminal random access resource as the first random access resource. In this way, when the second-type terminal random access resource is not configured, the third-type random access resource may be used to realize random access, so as to successfully complete the random access and achieve uplink synchronization.

[0018] In a possible design solution, the method provided in the first aspect may further include: the terminal device receives a message 2 from the network device. The message 2 indicates a timing advance for transmitting information by the terminal device to the network device, a delay for transmitting a message 3 by the terminal device, and a bandwidth occupied by the message 3. The bandwidth is occupied by the terminal device for transmitting the message 3. The delay for transmitting the message 3 by the terminal device is greater than the delay for transmitting the message 3 by the second type terminal and the delay for transmitting the message 3 by the third type terminal, and the bandwidth occupied by the terminal device for transmitting the message 3 is less than the bandwidth occupied by the second type terminal for transmitting the message 3 and the bandwidth occupied by the second type terminal for transmitting the message 3.

[0019] Optionally, the method provided in the first aspect may further include: the terminal device sends a message 3 based on the message 2. The message 3 further indicates that the terminal device is a first type terminal. In this way, the terminal device indicates in the message 3 that the terminal device is a first type terminal, so that the network device can timely obtain the type of the terminal device, and the network device performs resource scheduling based on the type of the terminal device.

[0020] In a possible design solution, the method provided in the first aspect may further include: the terminal device receiving second indication information from the network device, the second indication information indicating that a first type of terminal is authorized to access the network device, and the terminal device may perform a random access procedure after receiving the second indication information, thereby realizing management of different types of terminals by the network device.

[0021] In a possible design solution, before the terminal device determines the first random access resource, the method provided in the first aspect may further include: the terminal device receives third indication information from the network device. The third indication information indicates one or more of the following: the number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device. The terminal device determines to camp on a cell corresponding to the network device based on the third indication information and capability information of the terminal device. In this way, before performing the random access procedure, the terminal device may select to camp on a cell that corresponds to the network device and matches the capability information of the terminal device, thereby improving communication efficiency.

[0022] Optionally, determining, by the terminal device, to camp on the cell corresponding to the network device based on the third indication information and the capability information of the terminal device may include: when the capability information of the terminal device includes the number of receiving antennas of the terminal device, if the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third indication information, the terminal device camps on the cell corresponding to the network device, and / or when the capability information of the terminal device includes a duplex mode of the terminal device, and the duplex mode of the terminal device is a duplex mode supported by the network device, the terminal device camps on the cell corresponding to the network device.

[0023] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0024] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information may include second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0025] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first-type terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second-type terminal supported by the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead.

[0026] In a possible design solution, the method provided in the first aspect may further include: the terminal device receives fourth indication information from the network device; the fourth indication information indicates resources for data transmission between the terminal device and the network device; the bandwidth of the resources for data transmission between the terminal device and the network device is less than or equal to a bandwidth threshold; in this way, the bandwidth of the resources subsequently scheduled by the terminal device can satisfy the bandwidth limitation of the first type terminal on the resources.

[0027] For example, the bandwidth threshold may be determined based on the first type of terminal, for example, the bandwidth threshold may be 5 megahertz.

[0028] According to a second aspect, a random access resource selection method is provided. The random access resource selection method includes: a network device receives a message 1 from a terminal device on a first random access resource; the first random access resource includes a random access resource of a second type terminal or a random access resource of a third type terminal; the terminal device is a first type terminal with reduced capacity, the second type terminal is a reduced-capability terminal, and the third type terminal is a non-reduced-capability terminal; the random access resource of the second type terminal is used by the second type terminal for random access to the network device, and the random access resource of the third type terminal is used by the third type terminal for random access to the network device; the message 1 is used by the terminal device for random access to the network device; the network device transmits a message 2 to the terminal device based on the message 1 to perform random access; the message 2 indicates a timing advance for transmitting information to the network device by the terminal device, and the timing advance is determined based on the message 1.

[0029] According to a random access resource selection method provided in a second aspect, a network device may receive a message 1 from a terminal device on a first random access resource and send a message 2 to the terminal device. The first random access resource is a random access resource for a first type terminal or a random access resource for a second type terminal. In this way, when the random access resource for the first type terminal is not configured, the message 1 may be received on the random access resource for the second type terminal or the random access resource for a third type terminal to realize random access for the first type terminal.

[0030] In a possible design solution, receiving, by the network device, a message 1 from the terminal device on a first random access resource includes: when a random access resource of a first type terminal is not configured, the network device receives the message 1 from the terminal device on the first random access resource; the random access resource of the first type terminal is used by the first type terminal to access the network device; thus, when a random access resource of a second type terminal and a random access resource of a third type terminal are configured for the terminal device, the message 1 may be received by using the random access resource of the second type terminal.

[0031] In a possible design solution, receiving, by the network device, a message 1 from the terminal device on the first random access resource includes: when a random access resource of a second type of terminal is configured, the network device receives a message 1 from the terminal device on the random access resource of the second type of terminal.

[0032] In other words, when a random access resource of a second type terminal and a random access resource of a third type terminal are configured for a terminal device, the priority of the random access resource of the second type terminal may be higher than the priority of the random access resource of the third type terminal.

[0033] Optionally, the random access resources of the second type terminals and the random access resources of the third type terminals may be included in the same bandwidth portion BWP.

[0034] In a possible design solution, the method provided in the second aspect may further include: the network device sends a system message 1 to the terminal device, where the system message 1 indicates a first random access resource. In this way, the first random access resource is indicated by using the system message 1, thereby enabling the network device to allocate resources more flexibly.

[0035] Optionally, the random access resources of the second type terminals and the random access resources of the third type terminals may be included in different BWPs.

[0036] In a possible design solution, the network device configures a third-type terminal random access resource for the terminal device. Receiving, by the network device, a message 1 from the terminal device on the first random access resource includes: when the first-type terminal random access resource and the second-type terminal random access resource are not configured, the network device receives the message 1 from the terminal device on the third-type terminal random access resource. In this way, when the second-type terminal random access resource is not configured, the third-type random access resource may be used to realize random access, so as to successfully complete the random access and achieve uplink synchronization.

[0037] In a possible design solution, message 2 may further indicate a timing advance for transmitting information by the terminal device to the network device, a delay for transmitting message 3 by the terminal device, and a bandwidth of resources occupied by message 3. The delay for transmitting message 3 by the terminal device is greater than the delay for transmitting message 3 by the second type terminal and the delay for transmitting message 3 by the third type terminal. The bandwidth occupied by the terminal device for transmitting message 3 is less than the bandwidth occupied by the second type terminal for transmitting message 3 and the bandwidth occupied by the second type terminal for transmitting message 3.

[0038] Optionally, the method provided in the second aspect may further include: the network device receives a message 3 from the terminal device, where the message 3 further indicates that the terminal device is a first type terminal. In this way, the terminal device indicates in the message 3 that the terminal device is a first type terminal, so that the network device can timely obtain the type of the terminal device, and the network device performs resource scheduling based on the type of the terminal device.

[0039] In a possible design solution, the method provided in the second aspect may further include: the network device sends second indication information to the terminal device, the second indication information indicating that a first type of terminal is authorized to access the network device, and the terminal device may perform a random access procedure after receiving the second indication information, thereby realizing management of different types of terminals by the network device.

[0040] In a possible design solution, before the network device receives the message 1 from the terminal device on the first random access resource, the method provided in the second aspect may further include: the network device generates third indication information, the third indication information indicating one or more of the following: the number of receive antennas of the first type terminal that is restricted from accessing the network device, or the duplex modes supported by the network device; and the network device transmits the third indication information to the terminal device. The network device transmits the third indication information, so that, before performing the random access procedure, the terminal device may select to camp on a cell that corresponds to the network device and matches the capability information of the terminal device, thereby improving communication efficiency.

[0041] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0042] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of transmit / receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information includes second sub-indication information, and the second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0043] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first-type terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second-type terminal supported by the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead.

[0044] In a possible design solution, the method provided in the second aspect may further include: the network device sends fourth indication information to the terminal device, the fourth indication information indicating resources for data transmission between the terminal device and the network device, and a bandwidth of the resources for data transmission between the terminal device and the network device is equal to or less than a bandwidth threshold.

[0045] For example, the bandwidth threshold is 5 megahertz.

[0046] According to a third aspect, a communication method is provided. The communication method includes: a terminal device determines a second random access resource; the terminal device is an enhanced capacity-reduced first type terminal, and the second random access resource includes a first type random access resource applicable to the second type terminal and applicable to a first characteristic set; the second type terminal is a reduced-capability terminal; the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission; the terminal device transmits message 1 to the network device on the second random access resource; message 1 is used by the terminal device for random access to the network device.

[0047] According to a communication method provided in a third aspect, a terminal device may select a resource from the random access resources of the reduced-capability terminal device, and transmit message 1 on the selected resource to perform random access. In this way, when the random access resource of the first type terminal is not configured, the random access resource of the second type terminal or the random access resource of the third type terminal may be used to transmit message 1 to realize the random access of the first type terminal.

[0048] In a possible design solution, determining the second random access resource by the terminal device may include: when a second type of random access resource applicable to the first type of terminal and applicable to the first characteristic set is not configured for the terminal device, the terminal device determines the second random access resource from the first type of random access resource.

[0049] In a possible design solution, the method provided in the third aspect may further include: the terminal device receives first information from the network device, the first information indicating that a first type of random access resource is applicable to the first type of terminal and an SDT procedure triggered by the first type of terminal, and the terminal device can determine a second random access resource based on the instruction of the network device to reduce collisions.

[0050] Optionally, the first information may be carried in the characteristic combination field, in this way no new field is added and resource overhead can be reduced.

[0051] In a possible design solution, the first type of terminal may include a first type of terminal supporting a first type of capability or a first type of terminal supporting a second type of capability. The maximum transmission rate of the first type of terminal supporting the first type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a first parameter, and the baseband bandwidth of the data transmission channel of the first type of terminal supporting the first type of capability is smaller than the baseband bandwidth of the data transmission channel of the second type of terminal. The maximum transmission rate of the first type of terminal supporting the second type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a second parameter. The first parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a first threshold. The second parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a second threshold.

[0052] Optionally, the method provided in the third aspect may further include: the terminal device receives second information from the network device, the second information indicating that the first type of random access resource is applicable to a first type of terminal supporting a first type capability and an SDT procedure triggered by the first type of terminal supporting the first type capability. In this way, scenarios in which the first type of random access resource is applicable may be indicated, thereby allowing the first type of random access resource to be used more flexibly.

[0053] According to a fourth aspect, a communication method is provided. The communication method includes: a network device receives a message 1 from a terminal device on a second random access resource; the terminal device is an enhanced capacity-reduced first type terminal, and the second random access resource includes a first type random access resource applicable to the second type terminal and applicable to a first characteristic set; the second type terminal is a reduced-capability terminal; the first characteristic set includes small data transmission, network slicing, or message 3 retransmission; and the message 1 is used by the terminal device for random access to the network device.

[0054] In a possible design solution, receiving, by the network device, the message 1 from the terminal device on the second random access resource may include: when a second type of random access resource used for a first type of terminal and applicable to the first characteristic set is not configured for the terminal device, the network device receives the message 1 from the terminal device on the first type of random access resource.

[0055] In a possible design solution, the method provided in the fourth aspect may further include: the network device sends first information to the terminal device, where the first information indicates that a first type of random access resource is applicable to the first type of terminal and an SDT procedure triggered by the first type of terminal.

[0056] Optionally, the first information may be carried in a feature combination field.

[0057] In a possible design solution, the first type of terminal may include a first type of terminal supporting a first type of capability or a first type of terminal supporting a second type of capability. The maximum transmission rate of the first type of terminal supporting the first type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a first parameter, and the baseband bandwidth of the data transmission channel of the first type of terminal supporting the first type of capability is smaller than the baseband bandwidth of the data transmission channel of the second type of terminal. The maximum transmission rate of the first type of terminal supporting the second type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a second parameter. The first parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a first threshold. The second parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a second threshold.

[0058] Optionally, the method provided in a fourth aspect may further include: the network device sending second information to the terminal device, where the second information indicates that the first type of random access resource is applicable to a first type terminal supporting the first type capability and an SDT procedure triggered by the first type terminal supporting the first type capability.

[0059] The technical effects of the method provided in the fourth aspect refer to the technical effects of the method provided in the third aspect, and the details will not be described again in this specification.

[0060] According to a fifth aspect, there is provided an access control method. The access control method includes: a terminal device receiving third indication information from a network device; the third indication information indicating one or more of the following: the number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device; and the terminal device determining whether to camp on a cell corresponding to the network device based on the third indication information and capability information of the terminal device. The first type terminal is an enhanced reduced-capability terminal.

[0061] According to an access control method provided in a fifth aspect, a terminal device may receive third instruction information from a network device, and determine whether to visit a cell corresponding to the network device based on the third instruction information and capability information of the terminal device. The third instruction information indicates one or more of the following: the number of receiving antennas of an enhanced reduced-capability terminal that is restricted from accessing the network device, or a duplex mode supported by the network device. In this way, when the capability information of the terminal device does not match the third instruction information, the terminal device can avoid visiting a cell corresponding to the network device. When the capability information of the terminal device matches the third instruction information, the terminal device can visit a cell corresponding to the network device, and access control for the terminal device can be realized.

[0062] In a possible design solution, determining, by the terminal device, whether to reside in the cell corresponding to the network device based on the third indication information and the capability information of the terminal device may include: when the capability information of the terminal device includes the number of receiving antennas of the terminal device, if the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third indication information, the terminal device resides in the cell corresponding to the network device, and / or when the capability information of the terminal device includes a duplex mode of the terminal device, if the duplex mode of the terminal device is a duplex mode supported by the network device, the terminal device resides in the cell corresponding to the network device.

[0063] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0064] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information may include second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0065] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first-type terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second-type terminal supported by the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead.

[0066] In a possible design solution, the third indication information may be carried in the access control field of the system information block.

[0067] According to a sixth aspect, there is provided an access control method. The access control method includes: a network device generates third indication information, the third indication information indicating one or more of the following: a number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device; and the network device transmits the third indication information to a terminal device. The first type terminal is an enhanced reduced-capability terminal.

[0068] According to an access control method provided in a sixth aspect, the network device may generate third instruction information and send the third instruction information to the network device. The third instruction information indicates one or more of the following: the number of receiving antennas of an enhanced reduced-capability terminal that is restricted from accessing the network device, or a duplex mode supported by the network device. In this way, when the third instruction information does not match the capability information of the terminal device, the terminal device can avoid being located in the cell corresponding to the network device. When the capability information of the terminal device matches the third instruction information, the terminal device can be located in the cell corresponding to the network device, and access control for the terminal device can be realized.

[0069] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0070] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information may include second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0071] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first-type terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second-type terminal supported by the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead.

[0072] In a possible design solution, the third indication information may be carried in the access control field of the system information block.

[0073] According to a seventh aspect, a communication method is provided. The communication method includes: a terminal device determines a third random access resource; when the terminal device is an enhanced capacity reduced first type terminal and a random access resource set configured by the network device includes a random access resource applicable to the first type terminal, the third random access resource is a random access resource in the random access resource set applicable to the first type terminal; and the terminal device transmits a message 1 to the network device on the third random access resource.

[0074] According to the method provided in the seventh aspect, when a random access resource applicable to a first type terminal exists, the terminal device may select the random access resource applicable to the first type terminal to perform random access.

[0075] In a possible design solution, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type of terminal within the random access resource set and a characteristic used to trigger the terminal device to perform random access, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission SDT, network slicing, or message 3 retransmission.

[0076] In a possible design solution, when the random access resource set includes random access resources applicable to the second type of terminals but does not include random access resources applicable to the first type of terminals, the third random access resource is a random access resource in the random access resource set that is applicable to the second type of terminals.

[0077] Optionally, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type of terminal by the network device within the random access resource set and a characteristic used to trigger the terminal device to perform random access, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission SDT, network slicing, or message 3 retransmission.

[0078] In a possible design solution, the terminal device selects a third random access resource from the random access resource set based on a characteristic used to trigger the terminal device to perform random access.

[0079] In a possible design solution, when the random access resource set includes random access resources applicable to a first type of terminal and includes random access resources whose applicable characteristics include all the characteristics of the second characteristic set, the third random access resource is a random access resource in the random access resource set whose applicable characteristics include the second characteristic set. When the random access resource set includes random access resources applicable to a first type of terminal and does not include random access resources whose applicable characteristics include all the characteristics of the second characteristic set, the third random access resource is a random access resource in the random access resource set that is applicable to a first type of terminal and that is applicable to some of the characteristics of the second characteristic set and the first characteristic. The second characteristic set includes all first type characteristics used to trigger a terminal device to perform random access. The first characteristic is a characteristic with the highest priority among all first type characteristics applicable to all random access resources whose applicable characteristics are some of the characteristics of the second characteristic set. The first type characteristics are resources other than the random access resources of the extended capacity reduced first type terminal characteristics and the capacity reduced second type terminal characteristics. In this way, when there is a random access resource applicable to all the characteristics of the second characteristic set, the random access resource applicable to all the characteristics of the second characteristic set is selected for random access to better ensure the communication requirements.When there is no random access resource applicable to all the characteristics of the second characteristic set, the random access resource whose applicable characteristic set is the characteristic set of the second characteristic set and satisfies the first characteristic set is preferentially selected for random access to better meet the communication requirements.

[0080] According to an eighth aspect, there is provided a communication method, the communication method including: a network device receiving a message 1 from a terminal device on a third random access resource, the terminal device being an enhanced capacity reduced first type terminal, the third random access resource being a random access resource applicable to the first type terminal within a random access resource set configured by the network device.

[0081] In a possible design solution, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type of terminal within the random access resource set and a characteristic used to trigger the terminal device to perform random access, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission SDT, network slicing, or message 3 retransmission.

[0082] In a possible design solution, when the random access resource set includes random access resources applicable to the second type of terminals but does not include random access resources applicable to the first type of terminals, the third random access resource is a random access resource in the random access resource set that is applicable to the second type of terminals.

[0083] Optionally, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type of terminal by the network device within the random access resource set and a characteristic used to trigger the terminal device to perform random access, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission SDT, network slicing, or message 3 retransmission.

[0084] In a possible design solution, when the random access resource set includes random access resources applicable to a first type of terminal and includes random access resources whose applicable characteristics include all the characteristics of the second characteristic set, the third random access resource is a random access resource in the random access resource set whose applicable characteristics include the second characteristic set. When the random access resource set includes random access resources applicable to a first type of terminal and does not include a random access resource whose applicable characteristics include all the characteristics of the second characteristic set, the third random access resource is a random access resource in the random access resource set that is applicable to a first type of terminal and that is applicable to some of the characteristics of the second characteristic set and the first characteristic. The second characteristic set includes all the characteristics of the first type used to trigger a terminal device to perform random access. The first characteristic is the characteristic with the highest priority among all the characteristics of the first type applicable to all random access resources whose applicable characteristics are some of the characteristics of the second characteristic set.

[0085] The technical effects of the method provided in the eighth aspect refer to the technical effects of the communication method provided in the seventh aspect, and the details will not be described again in this specification.

[0086] According to a ninth aspect, a communication method is provided. The communication method includes: a terminal device determines a fourth random access resource; the fourth random access resource is a random access resource within a random access resource set configured by the network device and applicable to a second characteristic set, the second characteristic set being a set of characteristics used to trigger the terminal device to perform random access; alternatively, the fourth random access resource is a random access resource applicable to some of the characteristics of the second characteristic set and to the first characteristic, and / or the fourth random access resource is a random access resource applicable to the second characteristic within the random access resource set; the first characteristic is a characteristic having the highest priority among all first-type characteristics applicable to all random access resources whose applicable characteristics are some of the characteristics of the second characteristic set; and the second characteristic is a characteristic of a first-type terminal with enhanced capacity reduction, a characteristic of a second-type terminal with capacity reduction, or a characteristic having a higher priority between the characteristic of the first-type terminal with enhanced capacity reduction and the characteristic of the second-type terminal with capacity reduction, applicable to random access resources within the random access resource set. The terminal device sends message 1 to the network device on the fourth random access resource.

[0087] According to a method provided in a ninth aspect, in the communication method, the terminal device may determine a fourth random access resource and transmit the message 1 based on the fourth random access resource. In this way, a random access resource applicable to the entire second characteristic set or applicable to a characteristic having a high characteristic priority may be selected for random access.

[0088] In a possible design solution, the terminal device is a terminal of the first type.

[0089] According to a tenth aspect, a communication method is provided. The communication method includes: a network device receives a message 1 from a terminal device on a fourth random access resource; the fourth random access resource is a random access resource within a random access resource set configured by the network device and applicable to a second characteristic set, the second characteristic set being a set of characteristics used to trigger the terminal device to perform random access; alternatively, the fourth random access resource is a random access resource applicable to some of the characteristics of the second characteristic set and to the first characteristic, and / or the fourth random access resource is a random access resource applicable to the second characteristic within the random access resource set; the first characteristic is a characteristic having the highest priority among all first-type characteristics applicable to all random access resources whose applicable characteristics are some of the characteristics of the second characteristic set; and the second characteristic is a characteristic of a first-type terminal with enhanced capacity reduction applicable to random access resources within the random access resource set, a characteristic of a second-type terminal with capacity reduction, or a characteristic having a higher priority between the characteristic of the first-type terminal with enhanced capacity reduction and the characteristic of the second-type terminal with capacity reduction.

[0090] In a possible design solution, the terminal device is a terminal of the first type.

[0091] The technical effects of the method provided in the tenth aspect refer to the technical effects of the communication method provided in the ninth aspect, and the details will not be described again in this specification.

[0092] According to an eleventh aspect, there is provided a communication device, the communication device being configured to execute the method according to any one of the implementation methods of the first to tenth aspects.

[0093] In this application, the communication apparatus according to the eleventh aspect may be a terminal device according to any one of the first, third, fifth, seventh or ninth aspects, or a network device according to any one of the second, fourth, sixth, eighth or tenth aspects, or a chip (system) or other component that may be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

[0094] It should be understood that the communication device according to the eleventh aspect includes corresponding modules, units, or means for implementing the methods according to any one of the first to tenth aspects. The modules, units, or means may be implemented by hardware, software, or hardware executing corresponding software. The hardware or software includes one or more modules or units configured to perform the functions in the above-mentioned methods.

[0095] According to a twelfth aspect, there is provided a communication device, the communication device including a processor, the processor being configured to execute a method according to any one of possible implementation manners of the first to tenth aspects.

[0096] In a possible design solution, the communication device according to the twelfth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used by the communication device according to the twelfth aspect to communicate with other communication devices.

[0097] In a possible design solution, the communication device according to the twelfth aspect may further include a memory. The memory and the processor may be integrated together or may be located separately. The memory may be configured to store computer programs and / or data for the method according to any one of the first to tenth aspects.

[0098] In this application, the communication apparatus according to the twelfth aspect may be a terminal device according to any one of the first, third, fifth, seventh or ninth aspects, or a network device according to any one of the second, fourth, sixth, eighth or tenth aspects, or a chip (system) or other component that may be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

[0099] According to a thirteenth aspect, there is provided a communication device, the communication device including a processor coupled to a memory, the processor configured to execute a computer program stored in the memory to cause the communication device to perform a method according to any one of the possible implementation manners of the first to tenth aspects.

[0100] In a possible design solution, the communication device according to the thirteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used by the communication device according to the thirteenth aspect to communicate with other communication devices.

[0101] In this application, the communication apparatus according to the thirteenth aspect may be a terminal device according to any one of the first, third, fifth, seventh or ninth aspects, or a network device according to any one of the second, fourth, sixth, eighth or tenth aspects, or a chip (system) or other component that may be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

[0102] According to a fourteenth aspect, there is provided a communication device including a processor and a memory. The memory is configured to store a computer program. When the processor executes the computer program, the communication device is caused to perform a method according to any one of the implementation methods of the first to tenth aspects.

[0103] In a possible design solution, the communication device according to the fourteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used by the communication device according to the fourteenth aspect to communicate with other communication devices.

[0104] In this application, the communication apparatus according to the fourteenth aspect may be a terminal device according to any one of the first, third, fifth, seventh or ninth aspects, or a network device according to any one of the second, fourth, sixth, eighth or tenth aspects, or a chip (system) or other component that may be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

[0105] According to a fifteenth aspect, there is provided a communication device including a processor, the processor being coupled to a memory and configured to read a computer program from the memory and then execute, based on the computer program, a communication method according to any one of the implementations of the first to tenth aspects.

[0106] In a possible design solution, the communication device according to the fifteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used by the communication device according to the fifteenth aspect to communicate with other communication devices.

[0107] In this application, the communication apparatus according to the ninth aspect may be a terminal device according to any one of the first, third, fifth, seventh or ninth aspects, or a network device according to any one of the second, fourth, sixth, eighth or tenth aspects, or a chip (system) or other component that may be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

[0108] According to a sixteenth aspect, there is provided a processor configured to execute a method according to any one of the possible implementations of the first to tenth aspects.

[0109] According to a seventeenth aspect, there is provided a communication system, the communication system including one or more terminal devices and one or more network devices.

[0110] According to an eighteenth aspect, there is provided a computer-readable storage medium containing a computer program or instructions which, when executed on a computer, causes the computer to perform a method according to any one of the possible implementations of the first to tenth aspects.

[0111] According to a nineteenth aspect, there is provided a computer program product comprising a computer program or instructions which, when executed on a computer, cause the computer to carry out a method according to any one of the possible implementations of the first to tenth aspects.

[0112] Furthermore, for the technical effects of the communication devices according to the 11th to 19th aspects, refer to the technical effects of the methods according to the 1st to 10th aspects, and the details will not be described again in this specification. [Brief explanation of the drawings]

[0113] [Figure 1] 1 is a schematic flowchart of contention-based random access according to an embodiment of the present application; [Figure 2] 1 is a schematic flowchart of non-contention based random access according to an embodiment of the present application; [Figure 3] 1 is a diagram of the architecture of a communication system according to an embodiment of the present application; [Figure 4] 1 is a schematic flowchart of a random access resource selection method according to an embodiment of the present application; [Figure 5]1 is a diagram of random access resource distribution according to an embodiment of the present application; [Figure 6] 2 is a diagram of random access resource distribution according to an embodiment of the present application; [Figure 7] 1 is a schematic flowchart of a communication method according to an embodiment of the present application; [Figure 8] 1 is a schematic flowchart 1 of an access control method according to an embodiment of the present application; [Figure 9] 2 is a schematic flowchart 2 of an access control method according to an embodiment of the present application; [Figure 10] 4 is a schematic flowchart of another communication method according to an embodiment of the present application. [Figure 11] 4 is a schematic flowchart of another communication method according to an embodiment of the present application. [Figure 12] 1 is a diagram of the structure of a communication device according to an embodiment of the present application; [Figure 13] 2 is a structure of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0114] A random access procedure may be used to establish a wireless connection between a terminal device and a network device. Random access (RA) includes contention-based RA and non-contention-based RA.

[0115] The contention-based RA and non-contention-based RA are described below with reference to specific procedures.

[0116] 1 is a schematic flowchart of the contention-based RA. As shown in FIG. 1, the contention-based RA includes the following steps S101 to S104.

[0117] S101: A terminal device sends an RA preamble to a network device. In response, the network device receives the RA preamble from the terminal device.

[0118] The RA preamble is used to estimate the uplink time difference between the terminal device and the network device.

[0119] The RA preamble may alternatively be referred to as the first message in the RA process, message 1 (Msg1), or message 1.

[0120] S102: In response to the RA preamble, the network device sends a random access response (RAR) to the terminal device. In response, the terminal device receives the RAR from the network device.

[0121] The RAR includes an uplink time difference between the terminal device and the network device, which is determined by the network device based on the received RA preamble.

[0122] The RAR may further indicate that the network device has successfully received the RA preamble from the terminal device.

[0123] The RAR may alternatively be referred to as message 2 in the RA process, or as message 2 (Msg2) or the second message.

[0124] The RAR may be carried on a physical downlink shared channel (PDSCH).

[0125] It may be understood that RARs corresponding to multiple terminal devices may be carried on the same PDSCH.

[0126] S103: The terminal device sends a message 3 to the network device. In response, the network device receives a message 3 from the terminal device.

[0127] Message 3 may alternatively be referred to as message 3 (Msg3) or the third message.

[0128] Message 3 carries an identifier of the terminal device, which is used to identify the terminal device. The identifier of the terminal device may be used to distinguish whether the terminal device collides with other terminal devices and thus may be used for collision resolution, i.e., contention resolution. For example, the identifier of the terminal device may be the identity (ID) of the terminal device. In another example, the network device is a cell. Assuming that the terminal device is connected to another cell before the terminal device executes S103, the identifier of the terminal device may be the cell radio network temporary identifier (C-RNTI) to which the terminal device is connected. The C-RNTI may be used to identify the terminal device connected to the cell. In other words, in a cell, the C-RNTI has a one-to-one correspondence with the terminal device connected to the cell. Assuming that the terminal device is not connected to another cell before the terminal device executes S103, the identifier of the terminal device may be an identifier from the core network.

[0129] S104: The network device sends a contention resolution message to the terminal device. In response, the terminal device receives a contention resolution message from the network device.

[0130] The conflict resolution message may alternatively be referred to as message 4, message 4 (Msg4), or the fourth message in the RA process.

[0131] The contention resolution message carries the cell radio network temporary identifiers (C-RNTIs) of the terminal devices that successfully contended for the channel.

[0132] For the terminal device, after transmitting message 3, the terminal device starts a contention resolution timer. After the timer starts, the terminal device monitors a physical downlink control channel (PDCCH) within a timing window. In a possible design solution, the duration of the contention resolution timer may be 64 milliseconds (ms).

[0133] Before the contention resolution timer expires, the terminal device continues to monitor the PDCCH to determine whether the contention resolution is successful, that is, to determine whether the terminal device has successfully accessed the network. When the terminal device determines that the contention resolution is successful, the terminal device stops the contention resolution timer. For example, in the following case 1.1 or case 1.2, the terminal device determines that the contention resolution is successful.

[0134] Case 1.1: The terminal device acquires the C-RNTI of the terminal device through PDCCH monitoring based on the contention resolution message. In this case, the terminal device stops the contention resolution timer and discards the temporary C-RNTI.

[0135] Case 1.2: The terminal device obtains the terminal device's temporary C-RNTI through PDCCH monitoring based on the contention resolution message, and the terminal device contention resolution identity carried in the media access control protocol data unit (MAC PDU) received by the terminal device from the PDSCH is the same as the terminal device contention resolution identity carried in message 3, that is, the MAC PDU decoding is successful. In this case, the terminal device stops the contention resolution timer and determines the temporary C-RNTI as the C-RNTI.

[0136] The terminal device does not stop the contention resolution timer before determining that contention resolution is successful. If the contention resolution timer expires, the terminal device discards the temporary C-RNTI and determines that contention resolution has failed. In this case, if the number of RA attempts by the terminal device is less than or equal to the attempt threshold, the terminal device attempts the RA again. If the contention resolution timer expires and the number of RA attempts by the terminal device is greater than the attempt threshold, the RA fails.

[0137] 2 is a schematic flowchart of non-contention-based RA. As shown in FIG. 2, non-contention-based RA includes the following steps S201 to S204.

[0138] S201: A network device allocates an RA preamble to a terminal device.

[0139] In a possible design solution, the RA preamble may be carried in radio resource control (RRC) signaling.

[0140] In another possible design solution, the random access indication may be carried on the PDCCH.

[0141] When sending a random access indication to the terminal device, the network device indicates a synchronization signal and a physical broadcast channel block (SSB) to the UE.

[0142] S202: The terminal device sends a random access preamble to the network device, and the network device receives the random access preamble from the terminal device in response.

[0143] For the implementation method of the random access preamble, please refer to the implementation principle of the random access preamble in S101.

[0144] Before S202, the terminal device may receive system information block 1 (SIB1) and obtain a physical random access channel (PRACH) configuration from SIB1. The PRACH configuration includes a time-frequency location where the terminal device transmits the RA preamble, i.e., a time domain location and a frequency domain location.

[0145] S203: The network device sends a message 2 to the terminal device in response to the message 1. In response, the terminal device receives the message 2 from the network device.

[0146] For the implementation principle of message 2, please refer to the implementation principle of message 2 in S102. For the implementation principle of S203, please refer to the relevant description of S102. The details will not be described again in this specification.

[0147] S204: The terminal device sends Message 3 to the network device. In response, the network device receives Message 3 from the terminal device.

[0148] For example, the terminal device may transmit message 3 to the network device at a preset transmission time based on a timing advance (TA, where TA may alternatively be referred to as timing alignment information).

[0149] For the implementation principle of message 3, please refer to the relevant description of message 3 in S103, and the details will not be described again in this specification.

[0150] It should be noted that in the following embodiments, unless otherwise specified, message 1, message 2, message 3 and message 4 are used for the description.

[0151] In the wireless communication protocol, reduced-capability terminals and non-reduced-capability terminals (which may also be referred to as legacy terminals) are defined. A reduced-capability terminal may perform random access by transmitting Message 1 on a random access resource configured for the reduced-capability terminal, such as a reduced-capability-specific Message 1 resource defined in R17. A non-reduced-capability terminal may perform random access by transmitting Message 1 on a random access resource for the non-reduced-capability terminal, such as a legacy Message 1 resource. In R18, an extended reduced-capability terminal is proposed. However, R18 does not define a resource for transmitting Message 1. How to select a resource for transmitting Message 1 to realize random access for the extended reduced-capability terminal is an urgent problem to be solved. Furthermore, in the wireless communication protocol, corresponding random access resources may be configured for terminal devices with different characteristics, so that the terminal device can perform random access and realize other functions, such as small data transmission. For a reduced-capability terminal device, a corresponding random access resource may currently be configured for the terminal device. After the enhanced reduced-capability terminal device is introduced, the corresponding random access resource may not be configured for the enhanced reduced-capability terminal device. As a result, the enhanced reduced-capability terminal device cannot perform random access or realize other functions, such as small data transmission. How to select a resource for transmitting message 1 to realize the random access of the enhanced reduced-capability terminal is an urgent problem to be solved.

[0152] Different random access resources have different characteristics, or in other words, different random access resources may be applicable to different characteristics. These characteristics may be related to the random access procedure triggered by the terminal device. For enhanced reduced-capability terminal devices, how to select a resource for random access from resources with different characteristics is an urgent problem to be solved.

[0153] To solve the above problem of random access resource selection, an embodiment of this application provides a random access resource selection method. In the random access resource selection method, a terminal device may determine a first random access resource from the random access resources of a first type terminal and / or the random access resources of a second type terminal, and transmit message 1 based on the first random access resource. The terminal device is an enhanced reduced-capability terminal, the second type terminal is a reduced-capability terminal, and the third type terminal is a non-reduced-capability terminal. In this way, random access for the first type terminal can be realized.

[0154] To solve the above-mentioned random access resource selection problem, an embodiment of this application further provides a communication method, in which, for a terminal device that is an enhanced reduced-capability terminal device, the terminal device may select a resource from the random access resources of the reduced-capability terminal device, and send message 1 on the selected resource to perform random access.

[0155] Furthermore, to solve the above-mentioned access control problem, an embodiment of this application further provides an access control method. In the access control method, the network device may send third indication information to the terminal device, and the terminal device may correspondingly receive the third indication information from the network device. The third indication information indicates one or more of the following: a transmission / reception mode of an enhanced reduced-capability terminal that is restricted from accessing the network device, or a duplex mode supported by the network device. After receiving the third indication information, the terminal device may determine whether to visit a cell corresponding to the network device based on a match between the transmission / reception mode or duplex mode of the terminal device and the third indication information. In this way, access control can be realized.

[0156] The technical solutions of this application are described below with reference to the accompanying drawings.

[0157] The technical solutions in the embodiments of this application may be applied to various communication systems, for example, wireless fidelity (Wi-Fi) systems, vehicle-to-everything (V2X) communication systems, device-to-device (D2D) communication systems, vehicular internet communication systems, 4th generation (4G) mobile communication systems such as long term evolution (LTE) systems, worldwide interoperability for microwave access (WiMAX) communication systems, 5th generation (5G) mobile communication systems such as new radio (NR) systems, and future communication systems such as 6th generation (6G) mobile communication systems.

[0158] All aspects, embodiments or features are presented in this application by describing a system that may include multiple devices, components, modules, etc. It is to be appreciated and understood that each system may include other devices, components, modules, etc. and / or may not include all of the devices, components, modules, etc. discussed with reference to the accompanying drawings. Furthermore, combinations of these solutions may be used.

[0159] Furthermore, in the embodiments of this application, terms such as "example" and "for example" are used to denote serving as an example, illustration, or explanation. Any embodiment or design manner described in this application as an "example" should not be described as being preferred or having more advantages than other embodiments or design manners. Rather, the term "example" is intended to present concepts in a particular way.

[0160] The network architectures and service scenarios described in the embodiments of this application are intended to more clearly explain the technical solutions in the embodiments of this application, but are not intended to limit the technical solutions provided in the embodiments of this application. Those skilled in the art may recognize that as network architectures evolve and new service scenarios emerge, the technical solutions provided in the embodiments of this application can also be applied to similar technical problems.

[0161] In order to facilitate understanding of the embodiments of this application, the communication system shown in Figure 3 is first used as an example to describe in detail the communication system applicable to the embodiments of this application. For example, Figure 3 is an architecture diagram of a communication system to which the method according to the embodiments of this application can be applied.

[0162] As shown in FIG. 3, the communication system includes a network device 301 and a terminal device 302 .

[0163] Network device 301 may exchange information with terminal device 302 .

[0164] Furthermore, the communication system shown in Figure 3 may further include other network devices or terminal devices and network elements, for example, the communication system shown in Figure 3 may further include an access and mobility management function (AMF) network element (not shown in Figure 3).

[0165] The network device is a device located on the network side of a communication system and having wireless transceiver functionality, or a chip or chip system that can be disposed in a device. Examples of the network device include, but are not limited to, an access point (AP) in a wireless fidelity (Wi-Fi) system, such as a home gateway, router, server, switch, or bridge, an evolved NodeB (eNB), a radio network controller (RNC), a NodeB (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved NodeB or home NodeB, HNB), a baseband unit (BBU), a wireless relay node, a wireless backhaul node, and a transmission reception point (TRP or TP). Alternatively, the network device may be a 5G system, for example, a gNB or a transmission point (TRP or TP) in a new radio (NR) system, or one antenna panel or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system. Alternatively, the network device may be a network node, for example, a baseband unit (BBU) or a distributed unit (DU) constituting a gNB or a transmission point, a road side unit (RSU) having base station functionality, etc.

[0166] The terminal device is a terminal that accesses a communication system and has wireless transceiver functionality, or a chip or chip system that can be disposed in a terminal. The terminal device may also be called an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of this application may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver functionality, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, an in-vehicle terminal, an RSU with terminal functionality, etc. The terminal device in this application may alternatively be an on-board module, an on-board module assembly, an on-board component, an on-board chip, or an on-board unit that is incorporated into the vehicle as one or more components or units. The vehicle may implement the methods provided in this application using an on-board module, an on-board module assembly, an on-board component, an on-board chip, or an on-board unit that is built into the vehicle.

[0167] It should be noted that the method provided in the embodiment of this application is applicable to the terminal device and network device shown in Figure 3. For specific implementation manner, please refer to the following method embodiment, and the details will not be described in this specification.

[0168] It should be noted that the solutions in the embodiments of this application may also be applied to other communication systems, and the corresponding names may be replaced with the names of corresponding functions in other communication systems.

[0169] It should be understood that Fig. 3 is a simplified diagram of an example only for ease of understanding. The communication system may further include other network devices and / or other terminal devices not shown in Fig. 3.

[0170] Hereinafter, the random access resource selection method provided in the embodiment of this application will be specifically described with reference to FIGS.

[0171] For example, Figure 4 is a schematic flowchart of a random access resource selection method according to an embodiment of this application. The random access resource selection method may be applicable to the communication between the terminal device and the network device shown in Figure 3.

[0172] As shown in FIG. 4, the random access resource selection method includes S401 to S405.

[0173] S401: A terminal device determines a first random access resource.

[0174] The terminal device is an enhanced reduced capability (eRedCap) first type terminal, the first random access resource includes a second type terminal random access resource or a third type terminal random access resource, the second type terminal is a reduced capability (RedCap) terminal, the third type terminal is a non-reduced capability terminal, the second type terminal random access resource is used by the second type terminal for random access to the network device, and the third type terminal random access resource is used by the third type terminal for random access to the network device.

[0175] It may be understood that S401 may be executed when the random access resource of the first type terminal is not configured for the terminal device.

[0176] It can be understood that the bandwidth used for communication by the first type of terminal is smaller than the bandwidth used for communication by the second type of terminal, and the bandwidth used for communication by the first type of terminal is smaller than the bandwidth used for communication by the third type of terminal, and the bandwidth used for communication by the second type of terminal is smaller than the bandwidth used for communication by the third type of terminal.

[0177] The random access resource of the second type terminal being used by the second type terminal for random access to the network device may mean that the random access resource of the second type terminal is used by the second type terminal to transmit message 1 to perform random access to the network device. It may also be understood that when accessing the network device, the second type terminal transmits message 1 by using the random access resource of the second type terminal.

[0178] The random access resource of the third type terminal being used by the third type terminal for random access to the network device may mean that the random access resource of the third type terminal is used by the third type terminal to transmit message 1 to perform random access to the network device. It may also be understood that when accessing the network device, the third type terminal transmits message 1 by using the random access resource of the third type terminal.

[0179] For example, the first type of terminal may be an eRedCap terminal, the second type of terminal may be a RedCap terminal, and the third type of terminal may also be referred to as a legacy terminal.

[0180] For example, when the second type terminal is RedCap, the random access resource of the second type terminal may be a RedCap-specific Message 1 resource defined in R17. The random access resource of the third type terminal may be referred to as a legacy Message 1 resource.

[0181] In a possible design solution, the configuration information may be pre-configured in the terminal device, and the configuration information indicates one or more of the following: random access resources of the second type terminal or random access resources of the third type terminal.

[0182] The configuration information in different cases will be explained below.

[0183] Case 2.1: A second-type terminal random access resource is configured for the terminal device. For example, case 2.1 may include: A second-type terminal random access resource is configured for the terminal device, or a second-type terminal random access resource and a third-type terminal random access resource are configured for the terminal device.

[0184] Optionally, in case 2.1, the priority of the random access resource of the second type terminal may be higher than the priority of the random access resource of the third type terminal.

[0185] In this case, S401 may include: the terminal device determines a first random access resource based on the random access resource of a second type terminal;

[0186] When the random access resource of the second type terminal and the random access resource of the third type terminal are configured for the terminal device, in S401, the terminal device may preferentially determine the random access resource of the second type terminal as the first random access resource. The terminal device preferentially determines the random access resource of the second type terminal as the first random access resource. In other words, the terminal device selects the random access resource by using a backoff mechanism. The bandwidth of the random access resource of the second type terminal is smaller than the bandwidth of the random access resource of the third type terminal. Therefore, when the random access resource of the second type terminal and the random access resource of the third type terminal are configured for the terminal device, the terminal device transmits message 1 on the random access resource of the second type terminal to reduce overhead.

[0187] Optionally, in case 2.1, as shown in FIG. 5, when the random access resource of the second type terminal and the random access resource of the third type terminal are configured for a terminal device, the random access resource of the second type terminal and the random access resource of the third type terminal may be included in the same bandwidth part (BWP).

[0188] When the random access resource of the second type terminal and the random access resource of the third type terminal are included in the same BWP, the method provided in FIG. 4 may further include: the network device sends first indication information to the terminal device, and correspondingly, the terminal device receives the first indication information from the network device.

[0189] The first indication information indicates a first random access resource. In this case, step S401 may include: the terminal device determines the first random access resource based on the first indication information.

[0190] The first indication information may be carried in system message 1, i.e., SIB1, or the first indication information is system message 1.

[0191] Example 1: Assume that a random access resource may be indicated by using an identifier of a random access resource. In this case, the first indication information may indicate the identifier of the random access resource. The terminal device may determine the random access resource indicated by the identifier of the random access resource as the first random access resource. For example, if the first indication information indicates an identifier of a random access resource for a second type terminal, the terminal device may determine the random access resource for the second type terminal as the first random access resource. In another example, if the first indication information indicates an identifier of a random access resource for a third type terminal, the terminal device may determine the random access resource for the third type terminal as the first random access resource.

[0192] Example 2: The first indication information may indicate a first random access resource by using a bit. Assume that the random access resource of a first type terminal is not defined in a protocol, and the random access resource of a second type terminal and the random access resource of a third type terminal are defined. In this case, the first indication information may indicate a random access resource by using 1 bit. For example, the random access resource of a second type terminal may be identified by using "1", and the random access resource of a third type terminal may be identified by using "0". If the first indication information is "1", the terminal device may determine the random access resource of the second type terminal as the first random access resource. If the first indication information is "0", the terminal device may determine the random access resource of the third type terminal as the first random access resource.

[0193] It can be understood that the bit-based indication principle of the first indication information is used only as an example. In actual implementation, the random access resource of the second type terminal may alternatively be identified by using "0", and the random access resource of the third type terminal may alternatively be identified by using "1".

[0194] Furthermore, when three or more types of random access resources are defined in the protocol, two or more bits may be used to indicate the random access resource, the details of which will not be described again in this specification.

[0195] In the embodiment of this application, unless otherwise specified, the random access resource is the resource used to carry Message 1. Details will not be described further below.

[0196] Optionally, as shown in FIG. 6, the random access resources of the second type terminals and the random access resources of the third type terminals may be included in different BWPs.

[0197] For example, the random access resources of the second type of terminal may be included in BWP#1, and the random access resources of the second type of terminal may be included in BWP#2.

[0198] Case 2.2: A third type of terminal random access resource is configured for the terminal device.

[0199] In case 2.2, S401 may include: when the random access resource of the first type terminal and the random access resource of the second type terminal are not configured for the terminal device, the terminal device determines the random access resource of the third type terminal as the first random access resource.

[0200] In this way, when the random access resource of the second type of terminal is not configured, the random access resource of the third type may be used to realize random access, so as to successfully complete the random access, realize uplink synchronization, and improve communication efficiency.

[0201] S402: The terminal device sends Message 1 to the network device on a first random access resource. Correspondingly, the network device receives Message 1 from the terminal device on the first random access resource.

[0202] Message 1 is used by terminal devices for random access to network devices.

[0203] For the implementation principle of message 1, please refer to the relevant description of message 1 in S101 or S202. For the implementation principle of S402, please refer to the relevant description of S101 or S202. The details will not be described again in this specification.

[0204] S403: The network device sends a message 2 to the terminal device based on the message 1. Correspondingly, the terminal device receives the message 2 from the network device.

[0205] In a possible design solution, message 2 may further indicate a TA for transmitting information by the terminal device to the network device, a delay for transmitting message 3 by the terminal device, and a bandwidth occupied by the terminal device for transmitting message 3. The delay for transmitting message 3 by the terminal device is greater than the delay for transmitting message 3 by the second type terminal and the delay for transmitting message 3 by the third type terminal, and the bandwidth occupied by the terminal device for transmitting message 3 is less than the bandwidth occupied by the second type terminal for transmitting message 3 and the bandwidth occupied by the second type terminal for transmitting message 3.

[0206] Since the terminal device is a first type terminal, the delay T of sending message 3 by the terminal device is T=T1+T2+m, where T1 is the delay of sending message 1 by the second type terminal, T2 is the delay of sending message 2 by the second type terminal, and m is the delay caused by the reduction in resource bandwidth of the first type terminal relative to the second type terminal.

[0207] It can be seen that message 3 includes an identifier of the terminal device.

[0208] The identifier of the terminal device in message 3 may be a logical channel identifier (LCID).

[0209] Optionally, the method provided in FIG. 4 may further include S404.

[0210] S404: The terminal device sends a message 3 to the network device based on the message 2. In response, the network device receives the message 3 from the terminal device.

[0211] Message 3 further indicates that the terminal device is a terminal of the first type.

[0212] In this way, the terminal device indicates in message 3 that the terminal device is a first type of terminal, so that the network device can obtain the type of the terminal device in a timely manner, and the network device performs resource scheduling based on the type of the terminal device.

[0213] It may be understood that the method provided in FIG. 4 may be applied to a contention-based RA procedure or may be applied to a non-contention-based RA procedure.

[0214] In some possible design solutions, the terminal device accesses the network device by using a non-contention-based RA procedure. In this case, for the implementation principle of message 3 in S404, please refer to the related description of message 3 in S204. For the implementation principle of S404, please refer to the related description of S204. The details will not be described again in this specification.

[0215] In some other possible design solutions, the terminal device accesses the network device by using a contention-based RA procedure. In this case, for the implementation principle of message 3 in S404, please refer to the related description of message 3 in S103. For the implementation principle of S404, please refer to the related description of S103. The details will not be described again in this specification.

[0216] When the terminal device accesses the network device by using a contention-based RA procedure, after S403, the method provided in FIG. 4 may further include S405.

[0217] S405: The network device sends message 4 to the terminal device. In response, the terminal device receives message 4 from the network device.

[0218] For the implementation principle of message 4 in S405, please refer to the relevant description of message 4 in S104. For the implementation principle of S405, please refer to the relevant description of S104. The details will not be described again in this specification.

[0219] In a possible design solution, the method provided in FIG. 4 may further include step 1.

[0220] Step 1: The network device sends second indication information to the terminal device. The terminal device receives the second indication information from the network device. The second indication information indicates that a first type of terminal is authorized to access the network device.

[0221] The second indication information may be carried in SIB1. For example, the second indication information may indicate an identifier of the first type of terminal in the cell selection parameter of SIB1 to indicate that the first type of terminal is authorized to access the network device. Alternatively, the second indication information may be realized by using a bit. For example, a bit "1" indicates that the first type of terminal is authorized to access the network device. In another example, a bit "0" indicates that the first type of terminal is authorized to access the network device. Alternatively, the second indication information may be realized by using an intra-frequency reselection identifier (IFRI). If the IFRI is present in SIB1, the first type of terminal is authorized to access the network device.

[0222] In this way, the terminal device may perform a random access procedure after receiving the second indication information, and realize management of different types of terminals by the network device.

[0223] Based on the solution provided in FIG. 4, the terminal device may determine a first random access resource, where the terminal device is an enhanced capacity reduced first type terminal, the first random access resource is a second type terminal random access resource or a third type terminal random access resource, and the terminal device transmits Message 1 on the first random access resource. The network device may receive the message on the first random access resource and start to transmit Message 2. In this way, when the random access resource of the first type terminal is not configured, the random access resource of the second type terminal or the random access resource of the third type terminal may be used to transmit Message 1 to realize random access of the first type terminal.

[0224] In a possible design solution, the method provided in FIG. 4 may further include steps 2 to 4 before the network device receives message 1 from the terminal device on the first random access resource.

[0225] Step 2: The network device generates third indication information, which indicates one or more of the following: a transmission / reception mode of an enhanced reduced-capability terminal that is restricted from accessing the network device, or a duplex mode supported by the network device.

[0226] Step 3: The network device sends third instruction information to the terminal device. In response, the terminal device receives third instruction information from the network device.

[0227] The third indication information indicates one or more of the following: a transmission / reception mode of a first type of terminal that is restricted from accessing the network device, or a duplex mode supported by the network device.

[0228] The transmit / receive mode of the first type terminal includes the number of receive antennas of the first type terminal, and may further include the number of transmit antennas of the terminal device. For the first type terminal, the number of transmit antennas of the terminal device is 1. In this case, the transmit / receive mode of the terminal device may be the number of receive antennas of the terminal device.

[0229] The transmit / receive mode of the first type terminal includes that the first type terminal may include one receive antenna or two receive antennas.

[0230] The duplex mode refers to whether two devices communicating with each other can transmit uplink and downlink data synchronously, whether the slots used to transmit uplink data are the same as the slots used to transmit downlink data, or whether the frequencies (center frequencies) used to transmit uplink data are the same as the frequencies used to transmit downlink data. Duplex modes supported by network devices may include half duplex-frequency division duplex (HD-FDD).

[0231] For example, the third indication information may indicate a transmission / reception mode of a first type terminal that is restricted from accessing the network device. Alternatively, the third indication information may indicate a duplex mode supported by the network device. Alternatively, the third indication information may indicate a transmission / reception mode of an enhanced reduced-capability terminal device that is restricted from accessing the network device and a duplex mode supported by the network device.

[0232] In a possible design solution, the third indication information may be carried in a system message, for example, in SIB1 of the system message.

[0233] For example, the third indication information may be carried in the access control field of SIB1.

[0234] The following describes the third indication information by using an example in which the transmission / reception mode of the first type terminal includes the number of receiving antennas of the first type terminal, and the duplex mode supported by the network device includes HD-FDD.

[0235] Optionally, the third indication information may reuse information in protocol release 17 (R17).

[0236] The third instruction information includes first sub-indication information, which indicates the number of receiving antennas of a first type of terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receiving antennas of a second type of terminal that is restricted from accessing the network device.

[0237] If a terminal device with one receiving antenna is restricted from accessing the network device, "cellBarredRedCap11Rx-r17" in the access control field may be used to indicate that a device with one receiving antenna is restricted from accessing the network device. In this case, the first sub-indication information included in the access control field includes "cellBarredRedCap1Rx-r17". If the third indication information indicates that a terminal device with two receiving antennas is restricted from accessing the network device, the information "cellBarredRedCap2Rx-r17" in the access control field may be used to indicate that a terminal device with two receiving antennas is restricted from accessing the network device. In this case, the first sub-indication information includes the information "cellBarredRedCap2Rx-r17".

[0238] Alternatively, optionally, the third indication information may use other information to indicate the number of receive antennas of the first type terminal that is restricted from accessing the network device. The third indication information includes second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first type terminal that is restricted from accessing the network device. For example, the second sub-indication information may be "cellBarredRedCap1Rx-r18" added to the access control field to indicate that a terminal device with one receive antenna is restricted from accessing the network device, and / or the second sub-indication information may be "cellBarredRedCap2Rx-r18" added to the access control field to indicate that a terminal device with two receive antennas is restricted from accessing the network device.

[0239] Optionally, the third indication information may include third sub-indication information. The third sub-indication information indicates a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second type of terminal supported by the network device. If the third indication information indicates that the duplex modes supported by the network device include HD-FDD, the information "halfDuplexRedCapAllowed" in the access control field may be used to indicate that the duplex modes supported by the network device include HD-FDD. In this case, "halfDuplexRedCapAllowed" is used for the third sub-indication information.

[0240] The third indication information may be carried in a master information block (MIB) or SIB1.

[0241] When the third indication information is carried in MIB1, the third indication information may specifically be carried in a cellBarred field.

[0242] Step 4: The terminal device determines whether to visit the cell corresponding to the network device according to the third indication information and the capability information of the terminal device.

[0243] Step 4 will be described below with reference to different cases of instruction information.

[0244] Case 3.1: The third indication information indicates the number of receiving antennas of the terminal device that is barred from accessing the network device.

[0245] In this case, step 4 may include: if the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third indication information, the terminal device is located in the cell corresponding to the network device.

[0246] The number of receiving antennas of the terminal device not matching the number of receiving antennas indicated by the third instruction information means that the number of receiving antennas of the terminal device is not included in the number of receiving antennas indicated by the third instruction information. For example, if the number of receiving antennas indicated by the third instruction information is two receiving antennas and the number of receiving antennas of the terminal device is one receiving antenna, the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third instruction information. In another example, if the number of receiving antennas indicated by the third instruction information is one receiving antenna and the number of receiving antennas of the terminal device is two receiving antennas, the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third instruction information. In another example, if the third instruction information does not indicate the number of receiving antennas and the number of receiving antennas of the terminal device is two receiving antennas and / or one receiving antenna, the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third instruction information. Details will not be described further below.

[0247] Step 4 may further include: if the number of receiving antennas of the terminal device is the same as the number of receiving antennas indicated by the third indication information, the terminal device is not located in the cell corresponding to the network device.

[0248] For example, if the third instruction information indicates that a terminal device having one receive antenna (1 receive, 1Rx) is not restricted from accessing the network device, and if the terminal device has one receive antenna, the terminal device is located in the cell corresponding to the network device.

[0249] In another example, if the third instruction information indicates that a terminal device having one receive antenna is restricted from accessing the network device, and if the terminal device has one receive antenna, the terminal device is not present in the cell corresponding to the network device.

[0250] Case 3.2: The third indication information indicates a duplex mode supported by the network device. In this case, step 4 may include: if the duplex mode of the terminal device is a duplex mode supported by the network device, the terminal device is located in a cell corresponding to the network device.

[0251] Step 4 may further include: If the duplex mode of the terminal device is not a duplex mode supported by the network device, the terminal device does not camp on the cell corresponding to the network device.

[0252] For example, if the third indication information indicates that the duplex mode supported by the network device is HD-FDD, and the duplex mode supported by the terminal device is HD-FDD, the terminal device is located in the cell corresponding to the network device.

[0253] In another example, if the third indication information indicates that the duplex mode supported by the network device is full duplex-frequency division duplex (FD-FDD), and the duplex mode supported by the terminal device is HD-FDD, the terminal device is not present in the cell corresponding to the network device.

[0254] Case 3.3: The third indication information indicates the number of receiving antennas of the enhanced reduced-capability terminal device that is restricted from accessing the network device and the duplex mode supported by the network device. In this case, step 4 may include: If the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third indication information and the duplex mode of the terminal device is the duplex mode supported by the network device, the terminal device is accommodated in the cell corresponding to the network device.

[0255] Step 4 may further include: if the number of receiving antennas of the terminal device is equal to the number of receiving antennas indicated by the third indication information, or the duplex mode of the terminal device is not a duplex mode supported by the network device, the terminal device does not reside in the cell corresponding to the network device.

[0256] In a possible design solution, the method provided in FIG.

[0257] Step 5: The network device sends fourth instruction information to the terminal device. In response, the terminal device receives fourth instruction information from the network device.

[0258] The fourth indication information indicates a resource for data transmission between the terminal device and the network device, wherein the bandwidth of the resource for data transmission between the terminal device and the network device is equal to or less than a bandwidth threshold.

[0259] The fourth indication information may be carried in SIB1.

[0260] The bandwidth threshold may be determined based on the bandwidth requirements of different types of terminal devices. For example, for a first type of terminal whose bandwidth requirement is 5 megahertz or less, the bandwidth threshold may be 5 megahertz. It can be understood that the bandwidth threshold in this specification is used merely as an example. In an actual implementation process, the bandwidth threshold may be other values. Details will not be described again in this specification.

[0261] In this way, the network device sends the third instruction information to the terminal device, so that before performing the random access procedure, the terminal device may select to be located in a cell that corresponds to the network device and matches the capability information of the terminal device, thereby improving communication efficiency.

[0262] In some embodiments, when random access resources for enhanced reduced-capability terminals are not configured in the network, for example, when dedicated random access resources are not configured for enhanced reduced-capability terminals to avoid network resource fragmentation, the terminal device may select a random access resource from random access resources configured for other types of terminal devices to perform random access. For ease of understanding, further description is given below with reference to Figure 7.

[0263] 7 is a schematic flowchart of a communication method according to an embodiment of this application. As shown in FIG. 7, the method includes the following steps:

[0264] S701: A terminal device determines a second random access resource.

[0265] The terminal device is an enhanced capacity-reduced first type terminal, and the second random access resources include first type random access resources applicable to the second type terminal and / or applicable to the first characteristic set. The second type terminal is a reduced capacity terminal. The first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

[0266] For the implementation manner of the first type terminal, the second type terminal and the third type terminal, please refer to the relevant description in the method provided in Figure 4. The details will not be described again in this specification.

[0267] The random access resource being applicable to a second type terminal means that the random access resource is applicable to a terminal device having the characteristics of the second type terminal. In other words, the random access resource is applicable to a reduced-capability terminal. In other words, the second type terminal may perform random access by using the random access resource. Similarly, hereinafter, the random access resource being applicable to a first type terminal means that the random access resource is applicable to a terminal device having the characteristics of the first type terminal. In other words, the random access resource is applicable to a reduced-capability terminal. In other words, the first type terminal may perform random access by using the random access resource.

[0268] The second random access resources including the first type of random access resources applicable to the second type of terminal and / or applicable to the first characteristic set include: the second random access resources include the first type of random access resources applicable to the second type of terminal, the second random access resources include the first type of random access resources applicable to the first characteristic set, or the second random access resources include the first type of random access resources applicable to the second type of terminal and / or applicable to the first characteristic set.

[0269] It may be understood that when the terminal device supports random access, the second random access resource includes a first type of random access resource applicable to the second type of terminal.

[0270] In a possible design solution, the first type of terminal may include a first type of terminal supporting a first type of capability or a first type of terminal supporting a second type of capability. The maximum transmission rate of the first type of terminal supporting the first type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a first parameter, and the baseband bandwidth of the data transmission channel of the first type of terminal supporting the first type of capability is smaller than the baseband bandwidth of the data transmission channel of the second type of terminal. The maximum transmission rate of the first type of terminal supporting the second type of capability is smaller than the transmission rate of the second type of terminal, and the maximum transmission rate of the first type of terminal supporting the first type of capability is determined based on a second parameter. The first parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a first threshold. The second parameter includes one or more of the following: the number of transport layers, a scaling factor, a modulation order, and a second threshold. The terminal reports some first parameters and the network delivers some parameters, so that the network determines the rate of the terminal.

[0271] For the specific implementation principle of the first type terminal supporting the first type capability or the first type terminal supporting the second type capability, please refer to the relevant description in protocol release 3GPP TS38.306, and the details will not be described again in this specification.

[0272] For example, the first threshold may be 3 or 3.2, and the second threshold may be 0.8. The maximum transmission rate of a first type terminal supporting a first type capability may be 10 Mbps (Million bits per second, Mbps), and the maximum transmission rate of a first type terminal supporting a second type capability may be 10 Mbps.

[0273] The transmission rate of the second type terminal may be any possible transmission rate among the transmission rates i of the second type terminal, where i is a positive integer.

[0274] The network slicing feature may be a dedicated network slice access stratum group (NSAG).

[0275] In a possible design solution, S701 may include: when a second type of random access resource applicable to a first type of terminal and applicable to a first characteristic set is not configured for the terminal device, the terminal device determines a second random access resource from the first type of random access resource.

[0276] For example, the terminal device may determine a part or the whole of the first type of random access resource as the second random access resource.

[0277] The terminal device may determine the second random access resource from the first type of random access resource based on the fifth indication information. The fifth indication information may be from the network device. The fifth indication information may be carried in SIB1 and / or other information.

[0278] For example, the fifth indication information may include one sub-information corresponding to each characteristic of the first-type capability terminal, the second-type capability terminal, and the first characteristic set, and the sub-information indicates whether the configured random access resource is applicable to the characteristic. For example, if the random access resource is applicable to the characteristic, the sub-information corresponding to the characteristic is "true." If the random access resource is not applicable to the characteristic, the sub-information corresponding to the characteristic is "false." For example, if the second-type random access resource is applicable to the second-type terminal and the SDT triggered by the first-type terminal, and the second-type random access resource is not applicable to network slicing and message 3 retransmission, the relationship between the characteristics provided in this embodiment of the present application and whether the second-type random access resource is applicable to the characteristic is shown in Table 1 below. Furthermore, the fifth indication information may further include sub-information corresponding to the second-type terminal. If the sub-information corresponding to the second type terminal, the sub-information corresponding to the first type terminal, and the sub-information corresponding to the SDT are all "true," the second type random access resource may be applicable to the SDT procedure triggered by the first type terminal and the second type terminal. For a first type terminal, if the sub-information corresponding to the first type terminal in the fifth indication information is set to "true," the sub-information corresponding to the SDT characteristic is set to "true," and the sub-information corresponding to the second type terminal is set to "true," the first type terminal may select a random access resource and trigger an SDT procedure. That is, the protocol specifies that if sub-information corresponding to a characteristic indicating "true" is received, a terminal that does not support the characteristic cannot perform access. If "true" is indicated for two types of terminals configured using the characteristic, the terminal device can use the resource (which may also be referred to as a random access resource) for access or considers the resource available, as long as the terminal type of the terminal device is one of the two types. [Table 1]

[0279] For example, the fifth indication information may be carried in a Feature Combination field of SIB1. Alternatively, the fifth indication information may be carried in a separate field within SIB1. Alternatively, the fifth indication information may be carried in other information.

[0280] In the embodiments of this application, a characteristic may be understood as a property or a function, and a characteristic set may also be understood as a characteristic combination, a feature combination, or a function combination.

[0281] S702: The terminal device sends Message 1 to the network device on the second random access resource. Correspondingly, the network device receives Message 1 from the terminal device on the second random access resource.

[0282] Message 1 is used by terminal devices for random access to network devices.

[0283] Additionally, message 1 may be further used to trigger a corresponding feature, ie, a function, in the first feature set.

[0284] In a possible design solution, receiving, by the network device, the message 1 from the terminal device on the second random access resource may include: when a second type of random access resource used for a first type of terminal and applicable to the first characteristic set is not configured for the terminal device, the network device receives the message 1 from the terminal device on the first type of random access resource.

[0285] In a possible design solution, the method provided in FIG. 7 may further include S701a.

[0286] S701a: The network device sends first information to the terminal device. Correspondingly, the terminal device receives the first information from the network device.

[0287] The first information indicates that a first type of random access resource is applicable to a first type of terminal and characteristics corresponding to a first characteristic set, for example, an SDT procedure triggered by the first type of terminal.

[0288] In this way, the terminal device can determine the second random access resource based on the instruction of the network device, thereby reducing collisions.

[0289] Optionally, the first information may be carried in the characteristic combination field, in this way no new field is added and resource overhead can be reduced.

[0290] Optionally, the method provided in FIG. 7 may further include S701b.

[0291] S701b: The network device sends the second information to the terminal device. In response, the terminal device receives the second information from the network device.

[0292] The second information indicates that the first type of random access resource is applicable to a first type of terminal supporting a first type of capability and, for example, characteristics corresponding to an SDT procedure triggered by a first type of terminal supporting the first type of capability.

[0293] It may be understood that the first information and the second information may be transmitted together or may be transmitted separately.

[0294] In this way, scenarios in which the first type of random access resource is applicable may be indicated, thereby allowing the first type of random access resource to be used more flexibly.

[0295] The order of the steps above does not limit the order in which the steps are performed, as long as the order is logical. For example, S701a may be performed before or after S701b, or S701a may be performed in parallel with S701b.

[0296] In this embodiment of the application, the first type random access resource and the second type random access resource in this embodiment may be applicable to resources used to transmit a random access preamble in two-step random access, or may be applicable to random access resources in four-step random access. In other words, the random access resource in two-step random access or the random access resource in four-step random access may be used by a terminal to trigger corresponding characteristics through random access. That is, the random access resource may be reused. Furthermore, the characteristics of two-step random access and the characteristics of four-step random access may be reused.

[0297] It may be understood that other steps of the random access procedure may also be performed in the method provided in FIG.

[0298] As shown in (a) of Figure 7, in contention-based random access, the method provided in Figure 7 may further include S703a to S705a. For the implementation principle of S703a to S705a, please refer to the related descriptions in S102 to S104. The details will not be described again in this specification. The difference is that when Message 1 is used to trigger the SDT procedure, Message 2 in S703a may further indicate a data transmission resource to be used to transmit data, and Message 3 in S704a may further include the data to be transmitted.

[0299] As shown in (b) of FIG. 7, for non-contention-based random access, the method provided in FIG. 7 may further include S703b and S704b. For the implementation principles of S703b and S704b, please refer to the related descriptions in S203 and S204. The details will not be described again in this specification. The difference lies in that when message 1 is used to trigger an SDT procedure, message 2 in S703b may further indicate a data transmission resource to be used for transmitting data, and message 3 in S704b may further include the data to be transmitted. In this embodiment of the present application, it can be understood that when a second type of random access resource used for a first type of terminal and applicable to the first characteristic set is configured for the terminal device, determining the second random access resource by the terminal device in S701 may include the following: The terminal device determines the second type of random access resource as the second random access resource.

[0300] It can be understood that message 3 may further include capability information of the terminal device.

[0301] The terminal device may select a resource from the random access resources of the reduced-capability terminal device, and transmit message 1 on the selected resource to perform random access. In this way, when the random access resource of the first type terminal is not configured, the random access resource of the second type terminal or the random access resource of the third type terminal may be used to transmit message 1 to realize the random access of the first type terminal.

[0302] Furthermore, the method provided in FIG. 7 may further include the following steps:

[0303] Step 7-1: The network device sends the third information. Correspondingly, the AMF network element receives the third information.

[0304] The third information indicates the capabilities of the terminal device. For example, the third information may carry capability information of the terminal device for indicating the capabilities of the terminal device. Alternatively, the third information may indicate the capabilities of the terminal device by using a field, or the third information may indicate the capabilities of the terminal device by using one or more bits, for example, by using a bitmap. The third information may alternatively be referred to as capability information. The third information may be carried in message 3 or may be carried in other information. Details will not be described again in this specification.

[0305] Step 7-2: The AMF network element sends a paging message for the terminal device. Correspondingly, the network device receives the paging message for the terminal device.

[0306] The paging message carries fourth information about the terminal device, and the fourth information may indicate a capability of the terminal device.

[0307] For the implementation principle of the fourth information, please refer to the relevant description of the third information, and the details will not be described again in this specification.

[0308] Step 7-3: The network device determines a paging policy based on the fourth information received from the AMF network element.

[0309] For example, the network device determines whether to perform paging based on the fourth information received from the AMF network element.

[0310] For example, if the capabilities of the terminal device conveyed in the paging message match, e.g., are the same as, the capabilities of the terminal device that is authorized to access the network device, the network device sends the paging message to the terminal device.

[0311] For example, if a terminal device having a first type of capability is authorized to access the network device, when the terminal device is a first type of terminal having a first type of capability, the terminal device is authorized to access the network device and the network device sends a paging message to the terminal device.

[0312] It should be noted that if the capabilities of the terminal device conveyed in the paging message do not match, e.g., are different from, the capabilities of the terminal device that are authorized to access the network device, the network device may not send the paging message.

[0313] For example, if a terminal device having a first type of capability is permitted to access a network device, when the terminal device is a terminal of the first type having a second type of capability, the terminal device is not permitted to access the network device.

[0314] For the technical effects of Steps 7-1 to 7-3, refer to the following technical effects related to Fig. 9. The details will not be described again in this specification.

[0315] It can be understood that before S701, the method provided in FIG. 7 may further include step 7-4.

[0316] In some other embodiments, access control needs to be performed on the terminal devices to enable management of different types of terminals by the network device.

[0317] 8 is a schematic flowchart 1 of an access control method according to an embodiment of this application. As shown in FIG. 8, the access control method provided in this embodiment of this application may include S801 to S802.

[0318] S801: The network device sends third instruction information to the terminal device, and the terminal device receives third instruction information from the network device in response.

[0319] For the implementation principle of the third indication information, please refer to the relevant description of the third indication information in step 4. For the implementation principle of S801, please refer to the relevant description in step 4. The details will not be described again in this specification.

[0320] S802: The terminal device determines whether to be present in the cell corresponding to the network device based on the third indication information and the capability information of the terminal device.

[0321] The capability information of the terminal device may indicate the number of receive antennas supported by the terminal device and the duplex modes supported by the terminal device.

[0322] The cell corresponding to a network device is the cell of the network device that can provide service to the terminal device.

[0323] For the implementation principle of S802, please refer to the relevant description in step 5. The details will not be described again in this specification.

[0324] In a possible design solution, the method provided in Figure 8 may further include: the network device generates third indication information.

[0325] Optionally, the network device generating the third indication information may include: the network device generating the third indication information based on configuration information of the network device.

[0326] The configuration information of the network device may include the duplex modes supported by the network device and / or the transmit / receive modes of terminals of a first type that are restricted from accessing the network device.

[0327] For the implementation principle of the duplex mode supported by the network device and the transmission / reception mode of the first type terminal restricted from accessing the network device, please refer to the relevant description of the fourth indication information, and the details will not be described again in this specification.

[0328] When the configuration information of the network device includes a transmission / reception mode restricted by the network device, the third instruction information includes a transmission / reception mode of a first type of terminal that is restricted from accessing the network device.

[0329] If the configuration information of the network device includes a duplex mode supported by the network device, the third indication information includes a duplex mode supported by the network device.

[0330] When the configuration information of the network device includes a transmission / reception mode restricted by the network device and a duplex mode supported by the network device, the third instruction information includes a transmission / reception mode of an extended reduced-capability terminal device restricted from accessing the network device and a duplex mode supported by the network device.

[0331] It may be understood that the third indication information may alternatively be received by the network device from another network device.

[0332] According to the method provided in Fig. 8, the network device may send third indication information to the terminal device to indicate one or more of the following: a transmission / reception mode of the terminal device that is restricted from accessing the network device, and / or a duplex mode supported by the network device. After receiving the third indication information, the terminal device may determine whether to visit the cell corresponding to the network device based on the third indication information. In this way, when the capability information of the terminal device does not match the third indication information, the terminal device can avoid visiting the cell corresponding to the network device; when the capability information of the terminal device matches the third indication information, the terminal device can visit the cell corresponding to the network device, and access control for the terminal device can be realized.

[0333] In order to realize the management of the first type terminals having different capabilities by the network device, for example, when the network device is overloaded, access control needs to be performed on the terminal devices. When the first type terminals include a first type terminal supporting a first type capability and a first type terminal supporting a second type capability, the network device may perform access control on the first type terminals having different capabilities. The following description will be given with reference to FIG. 9.

[0334] 9 is a schematic flowchart 2 of the access control method according to an embodiment of this application. As shown in FIG. 9, the access control method provided in this embodiment of this application may include S901 to S906.

[0335] S901: A network device transmits restriction instruction information to a terminal device, and the terminal device receives restriction instruction information from the network device in response.

[0336] In some possible design solutions, the terminal device may be a first type terminal, and the first type terminal may include a first type terminal supporting a first type capability or a first type terminal supporting a second type capability. For an implementation manner of a first type terminal supporting a first type capability or a first type terminal supporting a second type capability, refer to the relevant description of the first terminal in FIG. 7. Details will not be described again in this specification. It may be understood that the first type terminal may also be a terminal supporting other capabilities. A first type terminal supporting a first type capability or a first type terminal supporting a second type capability is used merely as an example.

[0337] The restriction instruction information indicates that the network device has enabled a function to perform access control based on the capability type supported by the terminal device.

[0338] For example, the barring instruction information may be carried in SIB1. It may be understood that the barring instruction information may alternatively be carried in other information or signaling, and SIB1 herein is used merely as an example.

[0339] S902: The terminal device establishes an RRC connection to the network device.

[0340] The implementation principle of S902 can be referred to the prior art, and the details will not be described again in this specification.

[0341] S903: The terminal device sends capability indication information of the terminal device to the network device. Correspondingly, the network device receives capability indication information from the terminal device.

[0342] The capability indication information indicates the capability of the terminal device. For the content indicated by the capability indication information, refer to the content indicated by the third information in Fig. 7. The details will not be described again in this specification.

[0343] It should be noted that both S901 and S903 are optional steps.

[0344] S904: The network device sends third information. Correspondingly, the AMF network element receives the third information.

[0345] The third information indicates the capability of the terminal device. For the implementation principle of the third information, please refer to the relevant description in the method provided in Figure 7. The details will not be described again in this specification.

[0346] For the relevant description of S904, please refer to the relevant description of step 7-2, and the details will not be described again in this specification.

[0347] It can be understood that S904 may be determined based on S901 and S902, or may be received from another device such as a network device, the details of which will not be described again herein.

[0348] S905: The AMF network element sends a paging message for the terminal device. Correspondingly, the network device receives the paging message for the terminal device.

[0349] The paging message carries fourth information about the terminal device, and the fourth information may indicate a capability of the terminal device.

[0350] For the realization principle of the fourth information, please refer to the relevant description in the method provided in FIG. 7. For the relevant description of S905, please refer to the relevant description of step 7-2. The details will not be described again in this specification. The details will not be described again in this specification.

[0351] S906: The network device determines a paging policy based on the fourth information received from the AMF network element.

[0352] For the relevant description of S906, please refer to the relevant description of step 7-3, and the details will not be described again in this specification.

[0353] According to the method provided in Figure 9, the network device may determine whether to send a paging message to the terminal device based on the capability indication information carried in the paging message. In this way, when the capability information of the terminal device does not match the barring indication information, the terminal device is prevented from accessing the network device, thereby realizing access control for the terminal device.

[0354] It can be understood that the scenarios to which Figure 9 is applicable may further include other scenarios. The scenario in which a network device is overloaded is used merely as an example, and the details will not be described again herein.

[0355] In some possible implementation manners, when there is a random access resource applicable to the first type terminal, the terminal device selects the random access resource applicable to the first type terminal as a resource for random access. The following description is given with reference to Figure 10. As shown in Figure 10, the communication method includes the following steps:

[0356] S1001: A terminal device determines a third random access resource.

[0357] When the terminal device is an enhanced capability reduced first type terminal and the random access resource set configured by the network device includes a random access resource applicable to the first type terminal, the third random access resource is a random access resource applicable to the first type terminal in the random access resource set.

[0358] The random access resource set may include at least one random access resource configured by the network device.

[0359] In a possible design solution, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type of terminal within the random access resource set and a characteristic used to trigger the terminal device to perform random access, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission SDT, network slicing, or message 3 retransmission.

[0360] In a possible design solution, when the random access resource set includes random access resources applicable to the second type of terminals but does not include random access resources applicable to the first type of terminals, the third random access resource is a random access resource in the random access resource set that is applicable to the second type of terminals.

[0361] Optionally, when the random access resource set further includes a random access resource applicable to at least one characteristic in the first characteristic set, the third random access resource is a random access resource applicable to a first type terminal by the network device within the random access resource set and a characteristic used to trigger the terminal device to perform random access, wherein the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

[0362] In a possible design solution, the terminal device selects a third random access resource from the random access resource set based on a characteristic used to trigger the terminal device to perform random access.

[0363] Assume that the random access resource set includes random access resource 1 to random access resource 4. The applicable characteristics of random access resource 1 to random access resource 4 configured by the network device are shown in Table 2. In this case, the third random access resource is random access resource 1 or random access resource 2. [Table 2]

[0364] The following describes the third random access resource with reference to different cases.

[0365] Case 4.1: The third random access resource is a random access resource that includes all first type characteristics whose applicable characteristics are used to trigger the terminal device to perform random access within the random access resource set.

[0366] The first type characteristic is a resource other than the random access resource of the terminal characteristic of the first type of enhanced capacity reduction and the terminal characteristic of the second type of capacity reduction.

[0367] All the first type characteristics used to trigger the terminal device to perform random access are in the second characteristic set. The random access resources configured in Table 2 are used as an example. Assume that the terminal device supports the SDT characteristic and the Message 3 Retransmission characteristic. Since the characteristics to which Random Access Resource 1 is applicable include the SDT characteristic and the Message 3 Retransmission characteristic, Random Access Resource 1 is the third random access resource.

[0368] Case 4.2: Some of the properties of the second property set are all properties of the first type applicable to the third random access resource. In other words, the properties applicable to the third random access resource are some of the properties of the second property set, i.e., the properties applicable to the third random access resource are a subset of the set formed by the second property set.

[0369] In this case, the third random access resource is a random access resource whose applicable characteristics are part of the characteristics of the second characteristic set and are applicable to the first characteristic, where the first characteristic is the characteristic with the highest priority among all the characteristics of the first type applicable to all the random access resources whose applicable characteristics are part of the characteristics of the second characteristic set, i.e., if the random access resource is a subset of the second characteristic set, the random access resource may be selected as the third random access resource.

[0370] S1001 may include: When the random access resource set includes a random access resource applicable to a first type terminal and includes a random access resource whose applicable characteristics include all characteristics of a second characteristic set, the terminal device determines, as a third random access resource, a random access resource in the random access resource set whose applicable characteristics include the second characteristic set.

[0371] When the random access resource set includes a random access resource applicable to a first type of terminal and the applicable characteristics do not include a random access resource that includes all the characteristics of the second characteristic set, the terminal device determines a random access resource that is applicable to the first type of terminal and that is applicable to some of the characteristics of the second characteristic set and the first characteristic as a third random access resource.

[0372] The following uses the random access resources in Table 2 as an example. For example, if the characteristics used to trigger the terminal device to perform random access include the SDT characteristic and the network slicing characteristic, the third random access resource is random access resource 2 because random access resource 1 includes message 3 retransmission (not the characteristic used to trigger the terminal device to perform random access).

[0373] If the characteristics used to trigger the terminal device to perform random access include SDT, message 3 retransmission, and network slicing, assuming that the priority of the SDT characteristic is higher than the priority of the network slicing characteristic, when the resources configured by the network device are those shown in Table 2, the third random access resource is random access resource 1.

[0374] In other words, the terminal device may select a random access resource by using a backoff mechanism, and when a random access resource applicable to a first type terminal exists, the random access resource applicable to the first type terminal is selected as the third random access resource. When a random access resource applicable to the first type terminal does not exist but a random access resource applicable to a second type terminal exists, the random access resource applicable to the second type terminal is selected as the third random access resource.

[0375] In this embodiment of the application, it can be understood that the random access resource being applicable to a feature means that when configuring the random access resource, the network device sets the feature to "true" in the feature combination field, i.e., indicates that the feature associated with the configured random access preamble is the feature. In this embodiment of the application, it can be understood that the feature used by the random access resource may be explicitly indicated by the network device, for example, in a manner similar to the fifth indication information in FIG. 7. The details will not be described again in this specification. Message 3 retransmission may alternatively be referred to as message 3 repetition.

[0376] Furthermore, the priority of a characteristic for a terminal device may be configured by the network device (eg, by using a system message) or may be predefined according to a protocol.

[0377] S1002: The terminal device sends Message 1 to the network device on the third random access resource. Correspondingly, the network device receives Message 1 from the terminal device on the third random access resource. In this way, when a random access resource applicable to all the characteristics of the second characteristic set exists, the random access resource applicable to all the characteristics of the second characteristic set is selected for random access, thereby better ensuring communication requirements. When a random access resource applicable to all the characteristics of the second characteristic set does not exist, a random access resource whose applicable characteristic set is the characteristic set of the second characteristic set and satisfies the first characteristic set is preferentially selected for random access, thereby better meeting communication requirements.

[0378] For the implementation principle of S1002, please refer to the relevant description of S702, and the details will not be described again in this specification.

[0379] According to the method provided in FIG. 10, when there is a random access resource applicable to a first type terminal, the terminal device may select the random access resource applicable to the first type terminal to perform random access.

[0380] It may be understood that when a random access resource applicable to a first type of terminal does not exist in the random access resources configured by the network device and a random access resource applicable to a second type of terminal exists, the third random access resource is a random access resource applicable to the second type of terminal within the random access resources configured by the network device.

[0381] Case 4.3: The third random access resource is a random access resource whose applicable characteristics in the random access resource set include all the first type characteristics used to trigger the terminal device to perform random access. The random access resources configured in Table 2 are used as an example. Assume that the terminal device supports SDT and message 3 retransmission. Since the applicable characteristics of random access resource 1 include SDT and message 3 retransmission, random access resource 1 is the third random access resource.

[0382] Case 4.4: All of the first-type characteristics used to trigger the terminal to perform random access include characteristics applicable to the third random access resource. Alternatively, the characteristics applicable to the third random access resource are a part of all of the first-type characteristics used to trigger the terminal to perform random access, i.e., the characteristics applicable to the third random access resource are a subset of the set formed by all of the first-type characteristics used to trigger the terminal to perform random access.

[0383] That is, the third random access resource is a random access resource whose applicable characteristics are part of the characteristics of the second characteristic set and which is applicable to the first characteristic, the first characteristic being the characteristic with the highest priority among all characteristics of the first type applicable to all random access resources whose applicable characteristics are part of the characteristics of the first characteristic set.

[0384] When the random access resource set includes random access resources applicable to the second type of terminal, if the random access resource set includes random access resources whose applicable characteristics are all the characteristics of the second characteristic set, the terminal device may determine the random access resources in the random access resource set whose applicable characteristics include all the characteristics of the second characteristic set as the third random access resources. That is, if the random access resources in the random access resource set can exhibit all the characteristics of the second characteristic set, the random access resources that can exhibit all the characteristics of the second characteristic set may be used as the third random access resources.

[0385] If the random access resource set does not include a random access resource whose applicable characteristics are all the characteristics of the second characteristic set, the terminal device may determine as the third random access resource a random access resource that is applicable to the second type of terminal and some of the characteristics of the second characteristic set and that is applicable to the first characteristic.

[0386] Referring to the example of random access resources in Table 3, assume that the random access resources configured on the network side include random access resource 6 to random access resource 8. The characteristics to which resource 6 to resource 8 configured by the network device are applicable are shown in Table 3. If the characteristics used to trigger the terminal device to perform random access include SDT and message 3 retransmission, the third random access resource is random access resource 8. [Table 3]

[0387] In some possible embodiments, the terminal device may support random access resources applicable to terminals of a first type and random access resources applicable to terminals of a second type.

[0388] In this embodiment of this application, for the implementation principle of the first type terminal and the second type terminal, please refer to the relevant description in Figure 4. For the implementation principle of the information in the second characteristic set, please refer to the relevant description of the corresponding information in the first characteristic set in Figure 7. The details will not be described again in this specification.

[0389] Furthermore, in this embodiment of the application, the terminal device may further indicate whether the random access resources applicable to the second type terminal can be used for random access of the first type terminal by using separate information, and / or may indicate whether the random access resources applicable to the second characteristic set can be used for random access of the first type terminal.

[0390] Furthermore, in this embodiment of the present application, it can be understood that the random access resource set may further include random access resources applicable to a third type of terminal, for example, an NR terminal or an enhanced mobile broadband (eMBB) terminal. When the random access resources do not include random access resources applicable to the first type of terminal or the second type of terminal, the terminal device may select a third random access resource from the random access resources applicable to the third type of terminal. For an implementation manner of the third type of terminal, please refer to the related description in FIG. 4. The details will not be described again in this specification.

[0391] In some possible embodiments, the terminal device may select a random access resource by referring to the second characteristic set and the resource used for random access. The following description is given with reference to Figure 11. As shown in Figure 11, the communication method includes the following steps:

[0392] S1101: A terminal device determines a fourth random access resource.

[0393] The fourth random access resource is a random access resource that is within a random access resource set configured by the network device and is applicable to a second characteristic set, and the second characteristic set is a set of characteristics used to trigger the terminal device to perform random access.

[0394] Alternatively, the fourth random access resource is a random access resource that is applicable to some of the characteristics of the second characteristic set and to the first characteristic, and / or the fourth random access resource is a random access resource that is applicable to the second characteristic in the random access resource set.

[0395] The second characteristic is a characteristic of a terminal of a first type of enhanced capability reduction applicable to the random access resources in the random access resource set, a characteristic of a terminal of a second type of capability reduction, or a characteristic having a higher priority between the characteristic of a terminal of a first type of enhanced capability reduction and the characteristic of a terminal of a second type of capability reduction.

[0396] For example, if the characteristic applicable to all random access resources in the random access resource set is a characteristic of terminals of a first type with enhanced capability reduction, the second characteristic is a characteristic of terminals of a first type with enhanced capability reduction. If the characteristic applicable to all random access resources in the random access resource set is a characteristic of terminals of a second type with capability reduction, the second characteristic is a characteristic of terminals of a second type with capability reduction. If the random access resource set includes random access resources applicable to terminals of a first type with enhanced capability reduction and terminals of a second type with capability reduction, the second characteristic is a characteristic that has a higher priority between terminals of a first type with enhanced capability reduction and terminals of a second type with capability reduction.

[0397] The priority of terminals of the first type of enhanced capacity reduction may be the same as or different from the priority of terminals of the second type of capacity reduction.

[0398] The second characteristic set may include one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission. It can be understood that the characteristics included in the second characteristic set in this specification are used merely as examples. In an actual implementation, other characteristics may also be included.

[0399] For the principle of realizing the first property, please refer to the related explanation in S1001.

[0400] In a possible design solution, the terminal device is a terminal of the first type.

[0401] For ease of understanding, the fourth random access resource will be described below by using an example with reference to a specific case.

[0402] Case 5: The priority of the characteristics of the terminal of the first type of enhanced capacity reduction or the priority of the characteristics of the terminal of the second type of capacity reduction is not taken into account.

[0403] Case 5.1: If the random access resource set includes a random access resource applicable to the second characteristic set, the random access resource applicable to the second characteristic set is the fourth random access resource. In other words, S1101 includes: The terminal device determines, as the fourth random access resource, a random access resource applicable to the second characteristic set and one of the following: a characteristic of a first type of terminal with extended capacity reduction or a characteristic of a second type of terminal with capacity reduction.

[0404] In this case, it can be understood that the fourth random access resource is applicable to the second characteristic set and is further applicable to the characteristics of a terminal of the first type with enhanced capacity reduction or the characteristics of a terminal of the second type with capacity reduction.

[0405] The random access resources applicable to terminals of the second type may alternatively be described as the random access resources applicable to characteristics of terminals of the second type with reduced capacity, and the random access resources applicable to terminals of the first type may alternatively be described as the random access resources applicable to characteristics of terminals of the first type with enhanced reduced capacity.

[0406] Assuming that the random access resource set includes random access resource 9 to random access resource 11, the characteristics applicable to the random access resources are shown in Table 4. If the second characteristic set corresponding to the terminal device includes SDT, the fourth random access resource is resource 11. [Table 4]

[0407] Case 5.2: The random access resources in the random access resource set are not applicable to all properties of the second property set.

[0408] If there is one random access resource whose applicable characteristics are a subset of the second set of characteristics, the random access resource is a fourth random access resource.

[0409] If there are multiple random access resources whose applicable characteristics are subsets of the second characteristic set, the fourth random access resource is determined according to the priority of the characteristics in the second characteristic set.

[0410] The fourth random access resource is a random access resource whose applicable characteristics are part of the characteristics of the second characteristic set and which is applicable to the first characteristic, the first characteristic being the characteristic having the highest priority among all characteristics of the first type applicable to all random access resources whose applicable characteristics are part of the characteristics of the second characteristic set.

[0411] For example, assume that the characteristics applicable to the random access resources in the random access resource set are those shown in Table 4. If the characteristics supported by the terminal device include the SDT characteristic and the network slicing characteristic, and the priority of the SDT characteristic is higher than the priority of the network slicing characteristic, the fourth random access resource is resource 11.

[0412] In this case, step S1101 may include: The terminal device determines, as a fourth random access resource, a random access resource that is applicable to part of the characteristics of the second characteristic set and is applicable to the first characteristic.

[0413] Further description will be given below with reference to Table 4. Assume that the priority of the SDT property is higher than the priority of network slicing and the priority of message 3 retransmission, and the priority of network slicing is higher than the priority of message 3 retransmission. The second property set of the terminal device includes SDT, network slicing, and message 3 retransmission. In this case, the terminal device first determines that random access resource 9 to random access resource 13 are all selectable, but that SDT has the highest priority. Therefore, the terminal device may further determine that the random access resource selected by the terminal device is one of random access resource 11 and random access resource 12.

[0414] In this case, random access resource 12 is further applicable to message 3 retransmission, so the fourth random access resource determined by the terminal device is random access resource 12. Case 6: The priority of the characteristics of the terminal of the first type of enhanced capacity reduction or the priority of the characteristics of the terminal of the second type of capacity reduction is taken into account.

[0415] Case 6.1: The characteristic to which the fourth random access resource is applicable is the characteristic of a terminal of the first type of enhanced capacity reduction or the characteristic of a terminal of the second type of capacity reduction, in which case the fourth random access resource is the random access resource applicable to the second characteristic in the random access resource set.

[0416] In other words, S1101 may include: If the random access resource set includes a random access resource applicable to a first type of terminal characteristic of extended capacity reduction and a random access resource applicable to a second type of terminal characteristic of capacity reduction, the terminal device may determine the random access resource applicable to the second characteristic in the random access resource set as the random access resource. Hereinafter, Table 4 is used as an example. For example, assuming that the priority of the second type of terminal characteristic is higher than the priority of the first type of terminal characteristic, the fourth random access resource is random access resource 9 or random access resource 10.

[0417] Case 6.2: The characteristics to which the fourth random access resource is applicable include the characteristics of a terminal of the first type with extended capability reduction or the characteristics of a terminal of the second type with capability reduction, and the characteristics in the second characteristic set.

[0418] In other words, step S1101 may include: The terminal device may determine, as the fourth random access resource, a random access resource in which a first type of characteristic applicable in the random access resource set is part of the characteristic of the second characteristic set and is applicable to the second characteristic and the first characteristic.

[0419] If the retransmission of message 3 triggers random access and the priority of the characteristics of the terminal of the second type of capacity reduction is higher than the priority of the characteristics of the terminal of the first type of enhanced capacity reduction, resource 13 including the characteristics of the terminal of the first type of enhanced capacity reduction and the retransmission of message 3 is selected.

[0420] In this embodiment of the application, it can be understood that the random access resource being applicable to a feature means that when configuring the random access resource, the network device sets the feature to "true" in the feature combination field, i.e., indicates that the feature associated with the configured random access preamble is the feature. In this embodiment of the application, it can be understood that the feature used by the random access resource may be explicitly indicated by the network device, for example, in a manner similar to the fifth indication information in FIG. 7. The details will not be described again in this specification. Message 3 retransmission may alternatively be referred to as message 3 repetition.

[0421] Furthermore, the priority of a characteristic for a terminal device may be configured by the network device (eg, by using a system message) or may be predefined according to a protocol.

[0422] S1102: The terminal device sends Message 1 to the network device on the fourth random access resource. In response, the network device receives Message 1 from the terminal device on the fourth random access resource.

[0423] For the implementation principle of S1102, please refer to the relevant description of S702, and the details will not be described again in this specification.

[0424] 11, in the communication method, the terminal device may determine a fourth random access resource and transmit message 1 based on the fourth random access resource. In this way, a random access resource applicable to the entire second characteristic set or applicable to a characteristic having a high characteristic priority may be selected for random access.

[0425] In this embodiment of this application, for the implementation principle of the first type terminal and the second type terminal, please refer to the relevant description in Figure 4. For the implementation principle of the information in the second characteristic set, please refer to the relevant description of the corresponding information in the first characteristic set in Figure 7. The details will not be described again in this specification.

[0426] It may be understood that the random access resources in FIG. 10 or FIG. 11 are random access resources within a random access resource set unless otherwise specified.

[0427] The method provided in the embodiment of this application has been described in detail above with reference to Figures 3 to 11. Hereinafter, a communication device configured to perform the method provided in the embodiment of this application will be described in detail with reference to Figures 12 and 13.

[0428] For example, Figure 12 is a diagram of the structure of a communication device according to an embodiment of this application. As shown in Figure 12, a communication device 1200 includes a processing module 1201 and a transceiver module 1202. For ease of explanation, Figure 12 only shows the main components of the communication device.

[0429] In some embodiments, the communications apparatus 1200 may be used in the communications system shown in FIG. 3 and may perform the functions of a terminal device in the method shown in FIG.

[0430] The processing module 1201 is configured to determine a first random access resource.

[0431] Communications apparatus 1200 is an enhanced reduced-capability first-type terminal, and the first random access resources include random access resources of a second-type terminal or random access resources of a third-type terminal, where the second-type terminal is a reduced-capability terminal and the third-type terminal is a non-reduced-capability terminal, the random access resources of the second-type terminal are used by the second-type terminal for random access to the network device, and the random access resources of the third-type terminal are used by the third-type terminal for random access to the network device.

[0432] The transceiver module 1202 is configured to transmit Message 1 to the network device over the first random access resource, Message 1 being used by the communications apparatus 1200 for random access to the network device.

[0433] In a possible design solution, the processing module 1201 is configured to determine a first random access resource when a random access resource for the first type terminal is not configured for the communication apparatus 1200. The random access resource for the first type terminal is used by the first type terminal to access the network device.

[0434] In a possible design solution, the processing module 1200 is configured to determine the random access resource of the second type terminal as the first random access resource when the random access resource of the second type terminal is configured for the communication device 1200.

[0435] Additionally, the transceiver module 1202 is further configured to receive system message 1 from the network device, where system message 1 indicates a first random access resource.

[0436] In a possible design solution, a random access resource of a third type terminal is configured for the communication device 1200. The processing module 1201 is configured to determine the random access resource of the third type terminal as the first random access resource when the random access resource of the first type terminal and the random access resource of the second type terminal are not configured for the communication device 1200.

[0437] In a possible design solution, the transceiver module 1202 is further configured to receive a message 2 from a network device. The message 2 indicates a timing advance for transmitting information to the network device by the communication device 1200, a delay for transmitting a message 3 by the communication device 1200, and a bandwidth occupied by the communication device 1200 to transmit the message 3. The delay for transmitting the message 3 by the communication device 1200 is greater than the delay for transmitting the message 3 by the second type terminal and the delay for transmitting the message 3 by the third type terminal. The bandwidth occupied by the communication device 1200 to transmit the message 3 is less than the bandwidth occupied by the second type terminal to transmit the message 3 and the bandwidth occupied by the second type terminal to transmit the message 3.

[0438] Optionally, the transceiver module 1202 is further configured to transmit a message 3 based on the message 2. The message 3 further indicates that the communications device 1200 is a first type terminal.

[0439] In a possible design solution, the transceiver module 1202 is further configured to receive second indication information from the network device, the second indication information indicating that a first type of terminal is authorized to access the network device.

[0440] In a possible design solution, the transceiver module 1202 is further configured to receive third indication information from the network device, the third indication information indicating one or more of the following: a number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device. The processing module 1201 is further configured to determine to camp on a cell corresponding to the network device based on the third indication information and capability information of the communication apparatus 1200.

[0441] Optionally, the processing module 1201 is specifically configured to control the communication device 1200 to be in a cell corresponding to the network device when the capability information of the communication device 1200 includes the number of receiving antennas of the communication device 1200 and the number of receiving antennas of the communication device 1200 does not match the number of receiving antennas indicated by the third instruction information, and / or to control the communication device 1200 to be in a cell corresponding to the network device when the capability information of the communication device 1200 includes the duplex mode of the communication device 1200 and the duplex mode of the communication device 1200 is a duplex mode supported by the network device.

[0442] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0443] Optionally, the third indication information includes first sub-indication information, the first sub-indication information indicating the number of receive antennas of a first type of terminal that is restricted from accessing the network device, and the first sub-indication information further indicating the number of receive antennas of a second type of terminal that is restricted from accessing the network device. Alternatively, the third indication information includes second sub-indication information, the second sub-indication information indicating the number of receive antennas of the first type of terminal that is restricted from accessing the network device.

[0444] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second type of terminal supported by the network device.

[0445] Optionally, the transceiver module 1202 may include a receiving module and a transmitting module (not shown in FIG. 12). The transceiver module 1202 is configured to implement transmitting and receiving functions for the communications device 1200.

[0446] Optionally, the communication device 1200 may further include a storage module (not shown in FIG. 12 ). The storage module stores programs or instructions. When the processing module 1201 executes the programs or instructions, the communication device 1200 performs the functions of a terminal device in the communication method shown in any of the design solutions in FIG. 4 .

[0447] It should be understood that the processing module 1201 in the communication device 1200 may be realized by using a processor or processor-related circuit components, and may be a processor or a processing unit, and the transceiver module 1202 may be realized by using a transceiver or transceiver-related circuit components, and may be a transceiver or a transceiver unit.

[0448] It should be noted that the communication device 1200 may be a terminal device, or may be a chip (system) or other part or component that may be disposed in a terminal device, or may be a device that includes a network device, which is not limited in this application.

[0449] Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the random access resource selection method shown in any design solution of Figure 4. The details will not be described again in this specification.

[0450] In some other embodiments, the communications device 1200 may be used in the communications system shown in FIG. 3 and perform the functions of a network device in the method shown in FIG.

[0451] The processing module 1201 is configured to receive a message 1 from a terminal device on a first random access resource by using the transceiver module 1202.

[0452] The first random access resource includes a random access resource of a second type terminal or a random access resource of a third type terminal, where the second type terminal is a reduced-capability terminal and the third type terminal is a non-reduced-capability terminal, the random access resource of the second type terminal is used by the second type terminal for random access to communication device 1200, the random access resource of the third type terminal is used by the third type terminal for random access to communication device 1200, and message 1 is used by the terminal device for random access to communication device 1200.

[0453] The processing module 1201 is configured to perform random access by using the transceiver module 1202 to send a message 2 to the terminal device based on the message 1. The message 2 indicates a timing advance for transmitting information to the communication apparatus 1200 by the terminal device.

[0454] In a possible design solution, the transceiver module 1202 is configured to receive message 1 from a terminal device on a first random access resource when the random access resource for the first type terminal is not configured. The random access resource for the first type terminal is used by the first type terminal to access the communications apparatus 1200.

[0455] In a possible design solution, the transceiver module 1202 is configured to receive message 1 from the terminal device on a random access resource of the second type terminal when the random access resource of the second type terminal is configured for the terminal device.

[0456] In a possible design solution, the transceiver module 1202 is further configured to send a system message 1 to the terminal device, the system message 1 indicating a first random access resource.

[0457] In a possible design solution, communications apparatus 1200 configures a third type terminal random access resource for the terminal device. Transceiver module 1202 is further configured to receive message 1 from the terminal device on the third type terminal random access resource when the first type terminal random access resource and the second type terminal random access resource are not configured for the terminal device.

[0458] In a possible design solution, message 2 may further indicate a timing advance for transmitting information by the terminal device to communication apparatus 1200, a delay for transmitting message 3 by the terminal device, and a bandwidth of resources occupied by the terminal device to transmit message 3. The delay for transmitting message 3 by the terminal device is greater than the delay for transmitting message 3 by the second type terminal and the delay for transmitting message 3 by the third type terminal. The bandwidth occupied by the terminal device to transmit message 3 is less than the bandwidth occupied by the second type terminal to transmit message 3 and the bandwidth occupied by the second type terminal to transmit message 3.

[0459] Optionally, the transceiver module 1202 is further configured to receive a message 3 from the terminal device, wherein the message 3 further indicates that the terminal device is a first type terminal.

[0460] In a possible design solution, the transceiver module 1202 is further configured to transmit second indication information to the terminal device, the second indication information indicating that a first type of terminal is authorized to access the communications apparatus 1200.

[0461] In a possible design solution, the processing module 1201 is further configured to generate third indication information, which indicates one or more of the following: the number of receive antennas of a first type terminal that is restricted from accessing the communication device 1200, or a duplex mode supported by the communication device 1200. The transceiver module 1202 is further configured to transmit the third indication information to the terminal device.

[0462] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0463] Optionally, the third instruction information includes first sub-indication information, which indicates the number of receive antennas of the second-type terminals that are restricted from accessing the communication device 1200, and which further indicates the number of transmit / receive antennas of the second-type terminals that are restricted from accessing the communication device 1200. Alternatively, the third instruction information includes second sub-indication information, which indicates the number of receive antennas of the first-type terminals that are restricted from accessing the communication device 1200.

[0464] Optionally, the third indication information includes third sub-indication information, which indicates a duplex mode of a first type of terminal supported by the communication device 1200, and the third sub-indication information further indicates a duplex mode of a second type of terminal supported by the communication device 1200.

[0465] Optionally, the transceiver module 1202 may include a receiving module and a transmitting module (not shown in FIG. 12). The transceiver module 1202 is configured to implement transmitting and receiving functions for the communications device 1200.

[0466] Optionally, the communication device 1200 may further include a storage module (not shown in FIG. 12 ). The storage module stores programs or instructions. When the processing module 1201 executes the programs or instructions, the communication device 1200 is configured to perform the functions of a network device in the communication method shown in any of the design solutions in FIG. 4 .

[0467] It should be understood that the processing module 1201 in the communication device 1200 may be realized by using a processor or processor-related circuit components, and may be a processor or a processing unit, and the transceiver module 1202 may be realized by using a transceiver or transceiver-related circuit components, and may be a transceiver or a transceiver unit.

[0468] It should be noted that the communication device 1200 may be a network device, a chip (system) or other part or component that may be disposed in a network device, or a device that includes a network device, which is not a limitation in this application.

[0469] Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the random access resource selection method shown in any design solution of Figure 4. The details will not be described again in this specification.

[0470] In some other embodiments, the communications apparatus 1200 may be used in the communications system shown in FIG. 3 and perform the functions of a terminal device in the method shown in FIG.

[0471] The transceiver module 1202 is configured to receive third indication information from the network device, the third indication information indicating one or more of the following: a number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device, where the first type terminal is an enhanced reduced-capability terminal.

[0472] The processing module 1201 is configured to determine whether to be present in a cell corresponding to the network device based on the third indication information and the capability information of the communication device 1200.

[0473] In a possible design solution, the processing module 1201 is specifically configured as follows: if the capability information of the communication device 1200 includes the number of receiving antennas of the communication device 1200 and the number of receiving antennas of the communication device 1200 does not match the number of receiving antennas indicated by the third indication information, the communication device 1200 is located in a cell corresponding to the network device, and / or if the capability information of the communication device 1200 includes a duplex mode of the communication device 1200 and the duplex mode of the communication device 1200 is a duplex mode supported by the network device, the communication device 1200 is located in a cell corresponding to the network device.

[0474] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0475] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information may include second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0476] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second type of terminal supported by the network device.

[0477] In a possible design solution, the third indication information may be carried in the access control field of the system information block.

[0478] Optionally, the transceiver module 1202 may include a receiving module and a transmitting module (not shown in FIG. 12). The transceiver module 1202 is configured to implement transmitting and receiving functions for the communications device 1200.

[0479] Optionally, the communication device 1200 may further include a storage module (not shown in FIG. 12 ). The storage module stores programs or instructions. When the processing module 1201 executes the programs or instructions, the communication device 1200 performs the functions of a terminal device in the communication method shown in any of the design solutions in FIG. 9 .

[0480] It should be understood that the processing module 1201 in the communication device 1200 may be realized by using a processor or processor-related circuit components, and may be a processor or a processing unit, and the transceiver module 1202 may be realized by using a transceiver or transceiver-related circuit components, and may be a transceiver or a transceiver unit.

[0481] It should be noted that the communication device 1200 may be a terminal device, or may be a chip (system) or other part or component that may be disposed in a terminal device, or may be a device that includes a network device, which is not limited in this application.

[0482] Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution in Figure 9. The details will not be described again in this specification.

[0483] In some other embodiments, the communications device 1200 may be used in the communications system shown in FIG. 3 and perform the functions of a network device in the method shown in FIG.

[0484] The processing module 1201 is configured to generate third indication information.

[0485] The third indication information indicates one or more of the following: the number of receive antennas of enhanced reduced capacity terminals that are restricted from accessing the communication device 1200, or the duplex modes supported by the communication device 1200. The first type of terminal is an enhanced reduced capacity terminal.

[0486] The transceiver module 1202 is configured to transmit third indication information to the terminal device.

[0487] Optionally, the number of receiving antennas indicated by the third indication information includes one receiving antenna and / or two receiving antennas, and the duplex mode indicated by the third indication information includes half-duplex frequency division duplex.

[0488] Optionally, the third indication information includes first sub-indication information. The first sub-indication information indicates the number of receive antennas of a first-type terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of receive antennas of a second-type terminal that is restricted from accessing the network device. In this way, the first sub-indication information may be reused to indicate the number of receive antennas used by the first-type terminal to access the network device, thereby reducing overhead. Alternatively, the third indication information may include second sub-indication information. The second sub-indication information indicates the number of receive antennas of the first-type terminal that is restricted from accessing the network device.

[0489] Optionally, the third indication information includes third sub-indication information, where the third sub-indication information indicates a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicates a duplex mode of a second type of terminal supported by the network device.

[0490] In a possible design solution, the third indication information may be carried in the access control field of the system information block.

[0491] Optionally, the transceiver module 1202 may include a receiving module and a transmitting module (not shown in FIG. 12). The transceiver module 1202 is configured to implement transmitting and receiving functions for the communications device 1200.

[0492] Optionally, the communication device 1200 may further include a storage module (not shown in FIG. 12 ). The storage module stores programs or instructions. When the processing module 1201 executes the programs or instructions, the communication device 1200 performs the functions of a network device in the communication method shown in any of the design solutions in FIG. 7 .

[0493] It should be understood that the processing module 1201 in the communication device 1200 may be realized by using a processor or processor-related circuit components, and may be a processor or a processing unit, and the transceiver module 1202 may be realized by using a transceiver or transceiver-related circuit components, and may be a transceiver or a transceiver unit.

[0494] It should be noted that the communication device 1200 may be a network device, a chip (system) or other part or component that may be disposed in a network device, or a device that includes a network device, which is not a limitation in this application.

[0495] Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution in Figure 9. The details will not be described again in this specification.

[0496] In some other embodiments, the communication device provided in the embodiments of this application may further include a unit or module configured to perform the method shown in Fig. 7. Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution of Fig. 7. The details will not be described again in this specification.

[0497] In some other embodiments, the communication device provided in the embodiments of this application may further include a unit or module configured to perform the method shown in Fig. 9. Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution of Fig. 9. The details will not be described again in this specification.

[0498] In some other embodiments, the communication device provided in the embodiments of this application may further include a unit or module configured to perform the method shown in Fig. 10. Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution of Fig. 10. The details will not be described again in this specification.

[0499] In some other embodiments, the communication device provided in the embodiments of this application may further include a unit or module configured to perform the method shown in Fig. 11. Furthermore, the technical effects of the communication device 1200 refer to the technical effects of the access control method shown in any design solution of Fig. 11. The details will not be described again in this specification.

[0500] For example, FIG. 13 is FIG. 2 of the structure of a communication device according to an embodiment of this application. The communication device may be a terminal device or a network device, or a chip (system) or other part or component that may be disposed in the terminal device or the network device. As shown in FIG. 13, the communication device 1300 may include a processor 1301. Optionally, the communication device 1300 may further include a memory 1302 and / or a transceiver 1303. The processor 1301 is coupled to the memory 1302 and the transceiver 1303, and may be connected to the memory 1302 and the transceiver 1303 via a communication bus, for example.

[0501] Each component of the communication device 1300 will be specifically described below with reference to FIG.

[0502] Processor 1301 is the control center of communication device 1300 and may be a single processor or a collective term for multiple processing elements. For example, processor 1301 may be one or more central processing units (CPUs), or application specific integrated circuits (ASICs), or one or more integrated circuits configured to implement embodiments of this application, such as one or more digital signal processors (DSPs) or one or more field programmable gate arrays (FPGAs).

[0503] Optionally, the processor 1301 may perform various functions of the communication device 1300 by executing software programs stored in the memory 1302 and accessing data stored in the memory 1302 .

[0504] In a specific implementation, in an embodiment, the processor 1301 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG.

[0505] In a specific implementation, in an embodiment, communications device 1300 may alternatively include multiple processors, such as processor 1301 and processor 1304 shown in FIG. 13. Each processor may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). A processor herein may refer to one or more devices, circuits, and / or processing cores configured to process data (e.g., computer program instructions).

[0506] The memory 1302 is configured to store a software program for implementing the solution in this application, and the processor 1301 controls the execution. For specific implementation manners, please refer to the above method embodiments. The details will not be described again in this specification.

[0507] Optionally, memory 1302 may be, but is not limited to, read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, or random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other compact disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disc storage media or other magnetic storage devices, or any other medium capable of carrying or storing program code expected in the form of instructions or data structures and accessible by a computer. Memory 1302 may be integrated with processor 1301 or may exist independently and be coupled to processor 1301 through an interface circuit (not shown in FIG. 13 ) of communication device 1300. This is not particularly limited in this embodiment of the present application.

[0508] The transceiver 1303 is configured to communicate with other communication devices. For example, the communication device 1300 is a terminal device, and the transceiver 1303 may be configured to communicate with a network device or other terminal devices. In another example, the communication device 1300 is a network device, and the transceiver 1303 may be configured to communicate with a terminal device or other network devices.

[0509] Optionally, the transceiver 1303 may include a receiver and a transmitter (not shown separately in FIG. 13), where the receiver is configured to implement a receiving function and the transmitter is configured to implement a transmitting function.

[0510] Optionally, the transceiver 1303 may be integrated with the processor 1301 or may exist independently and be coupled to the processor 1301 through an interface circuit (not shown in FIG. 13) of the communication device 1300. This is not particularly limited in this embodiment of the application.

[0511] It should be noted that the configuration of communications device 1300 shown in Figure 13 does not constitute a limitation on the communications device. An actual communications device may include more or fewer components than those shown in the drawing, may combine some components, or may have a different arrangement of components.

[0512] Furthermore, the technical effects of the communication device 1300 refer to the technical effects of the random access resource selection method or the access control method shown in the above method embodiments, and the details will not be described again in this specification.

[0513] It should be understood that the processor in the embodiments of this application may be a central processing unit (CPU), or the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0514] It may be understood that the memory in the embodiments of this application may be volatile memory or nonvolatile memory, or may include volatile memory and nonvolatile memory. Nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) may be used, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM).

[0515] All or part of the above embodiments may be implemented using software, hardware (e.g., circuits), firmware, or any combination thereof. When software is used to implement the embodiments, the above embodiments may be fully or partially implemented in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the program instructions or computer programs are loaded and executed on a computer, the procedures or functions according to the embodiments of this application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., infrared, radio, and microwave) method. The computer-readable storage medium may be any available medium accessible by a computer, or a data storage device such as a server or data center that integrates one or more available media. The usable media may be magnetic media (e.g., floppy disk, hard disk, or magnetic tape), optical media (e.g., DVD), or semiconductor media, which may be a solid-state drive.

[0516] It should be understood that the term "and / or" in this specification describes only an association relationship between related objects and indicates that three relationships may exist. For example, A and / or B may indicate the following three cases: that only A exists, that both A and B exist, and that only B exists, and A and B may be singular or plural. Furthermore, the character " / " in this specification usually indicates an "or" relationship between related objects, but may also indicate an "and / or" relationship. For further details, please refer to the context for understanding.

[0517] In this application, at least one means one or more, and plural means two or more. "At least one of the following items" or similar phrases refers to any combination of items, including a singular item or any combination of multiple items. For example, at least one of a, b, or c may refer to a, b, c, ab, ac, bc, or abc, where a, b, and c may be singular or plural.

[0518] It should be understood that the sequence numbers of the above processes do not mean the execution order in various embodiments of this application. The execution order of the processes should be determined according to the functions and internal logic of the processes, and should not be construed as any limitation on the implementation process of the embodiments of this application.

[0519] Those skilled in the art may recognize that, in combination with the examples described in the embodiments disclosed in this specification, the units and algorithm steps may be realized by electronic hardware or a combination of computer software and electronic hardware. Whether a function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to realize the described functions for each specific application, but the implementation method should not be considered to go beyond the scope of this application.

[0520] For the purpose of convenient and concise description, it can be clearly understood by those skilled in the art that the detailed operation processes of the above systems, devices and units may be referenced to the corresponding processes in the above method embodiments, and the details will not be described again in this specification.

[0521] In some embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are merely examples. For example, the division into units is merely a logical division of function, and other divisions may be used in actual implementations. For example, multiple units or components may be combined or integrated into other systems, or some features may be ignored or not implemented. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be realized by using some interfaces. Indirect couplings or communication connections between devices or units may be realized in electronic, mechanical, or other forms.

[0522] The units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units, and may be located in one place or distributed across multiple network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

[0523] Furthermore, the functional units in the embodiments of this application may be integrated into one processing unit, each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0524] When a function is realized in the form of a software functional unit and sold or used as an independent product, the function may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application may essentially be realized, or a portion of the technical solution or a portion of the technical solution may be realized in the form of a software product. A computer software product is stored in a storage medium and includes some instructions for instructing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method described in the embodiments of this application. The above storage medium includes any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0525] The above description is merely a specific implementation of this application and is not intended to limit the scope of protection of this application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A random access resource selection method, comprising: determining, by a terminal device, a first random access resource, wherein the terminal device is an enhanced reduced-capability first-type terminal, the first random access resource includes a random access resource of a second-type terminal or a random access resource of a third-type terminal, the second-type terminal is a reduced-capability terminal, and the third-type terminal is a non-reduced-capability terminal, the random access resource of the second-type terminal is used by the second-type terminal for random access to a network device, and the random access resource of the third-type terminal is used by the third-type terminal for random access to the network device; sending, by the terminal device, a message 1 to the network device on the first random access resource, the message 1 being used by the terminal device for random access to the network device; A method comprising:

2. The step of determining, by the terminal device, the first random access resource includes:

2. The method of claim 1, comprising: when a random access resource of the first type terminal is not configured for the terminal device, determining, by the terminal device, the first random access resource, the random access resource of the first type terminal to be used by the first type terminal to access the network device.

3. The step of determining, by the terminal device, the first random access resource includes:

3. The method of claim 2, comprising: determining, by the terminal device, the random access resource of the second type terminal as the first random access resource when the random access resource of the second type terminal is configured for the terminal device.

4. The random access resource is a random access resource for transmitting the message 1, and the step of determining the first random access resource by the terminal device includes:

2. The method of claim 1, comprising: when a random access resource used by the first type terminal to transmit the message 1 is not configured, determining, by the terminal device, a random access resource used by the second type terminal to transmit the message 1 as the first random access resource.

5. 5. The method according to claim 1, further comprising the step of receiving, by the terminal device, a system message 1 from the network device, the system message 1 indicating the first random access resource.

6. The random access resource of the third type terminal is configured for the terminal device; The step of determining, by the terminal device, the first random access resource includes:

2. The method of claim 1, comprising: when a random access resource of the first type terminal and a random access resource of the second type terminal are not configured for the terminal device, determining, by the terminal device, the random access resource of the third type terminal as the first random access resource.

7. 7. The method of claim 1, further comprising the step of receiving, by the terminal device, a message 2 from the network device, the message 2 indicating a timing advance for transmitting information to the network device by the terminal device, a delay for transmitting a message 3 by the terminal device, and a bandwidth occupied by the terminal device for transmitting the message 3, wherein the delay for transmitting the message 3 by the terminal device is greater than the delay for transmitting the message 3 by the second type terminal and the delay for transmitting the message 3 by the third type terminal, and the bandwidth occupied by the terminal device for transmitting the message 3 is less than the bandwidth occupied by the second type terminal for transmitting the message 3 and the bandwidth occupied by the second type terminal for transmitting the message 3.

8. 8. The method of claim 7, further comprising the step of: transmitting, by the terminal device, the message 3 based on the message 2, the message 3 further indicating that the terminal device is the first type terminal.

9. 9. The method of claim 1, further comprising the step of receiving, by the terminal device, second indication information from the network device, the second indication information indicating that the first type of terminal is authorized to access the network device.

10. Before determining the first random access resource by the terminal device, receiving, by the terminal device, third indication information from the network device, the third indication information indicating one or more of the following: a number of receiving antennas of a first type of terminal that is restricted from accessing the network device, or a duplex mode supported by the network device; determining, by the terminal device, to be present in a cell corresponding to the network device based on the third indication information and capability information of the terminal device; The method of any one of claims 1 to 9, further comprising:

11. The step of determining, by the terminal device, to be present in the cell corresponding to the network device based on the third indication information and the capability information of the terminal device, includes: When the capability information of the terminal device includes the number of receiving antennas of the terminal device, if the number of receiving antennas of the terminal device does not match the number of receiving antennas indicated by the third indication information, visiting the cell corresponding to the network device by the terminal device; and / or When the capability information of the terminal device includes a duplex mode of the terminal device, if the duplex mode of the terminal device is a duplex mode supported by the network device, camping on the cell corresponding to the network device by the terminal device. The method of claim 10, comprising:

12. 12. The method according to claim 10 or 11, wherein the number of receive antennas indicated by the third indication information comprises one receive antenna and / or two receive antennas, and the duplex mode indicated by the third indication information comprises half-duplex frequency division duplex.

13. The third instruction information includes first sub-instruction information, the first sub-instruction information indicates the number of receiving antennas of a first type of terminal that is restricted from accessing the network device, and the first sub-instruction information further indicates the number of receiving antennas of a second type of terminal that is restricted from accessing the network device, or 13. The method according to claim 10, wherein the third instruction information includes second sub-indication information, and the second sub-indication information indicates the number of receiving antennas of a first type of terminal that is restricted from accessing the network device.

14. 14. The method according to claim 10, wherein the third indication information includes third sub-indication information, the third sub-indication information indicating a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicating a duplex mode of a second type of terminal supported by the network device.

15. A random access resource selection method, comprising: receiving, by a network device, a message 1 from a terminal device on a first random access resource, the first random access resource including a random access resource of a second type terminal or a random access resource of a third type terminal, the terminal device being a reduced-capability first type terminal, the second type terminal being a reduced-capability terminal, and the third type terminal being a non-reduced-capability terminal, the random access resource of the second type terminal being used by the second type terminal for random access to the network device, the random access resource of the third type terminal being used by the third type terminal for random access to the network device, and the message 1 being used by the terminal device for random access to the network device; sending, by the network device, a message 2 to the terminal device based on the message 1, the message 2 indicating a timing advance for transmitting information by the terminal device to the network device, the timing advance being determined based on the message 1; A method comprising:

16. receiving, by the network device, the message 1 from the terminal device on the first random access resource; 16. The method of claim 15, comprising: receiving, by the network device, the message 1 from the terminal device on the first random access resource when the random access resource of the first type terminal is not configured, the random access resource of the first type terminal being used by the first type terminal to access the network device.

17. receiving, by the network device, the message 1 from the terminal device on the first random access resource; 17. The method of claim 16, comprising receiving, by the network device, the message 1 from the terminal device on the random access resource of the second type terminal when the random access resource of the second type terminal is configured for the terminal device.

18. 18. The method of claim 16 or 17, further comprising the step of: sending, by the network device, a system message 1 to the terminal device, the system message 1 indicating the first random access resource.

19. the network device configuring the random access resource of the third type terminal for the terminal device; and receiving the message 1 from the terminal device on the first random access resource by the network device, 16. The method of claim 15, comprising receiving, by the network device, the message 1 from the terminal device on the random access resource of the third type terminal when a random access resource of the first type terminal and a random access resource of the second type terminal are not configured.

20. 20. The method of claim 15, wherein the message 2 further indicates a timing advance for transmitting information by the terminal device to the network device, a delay for transmitting the message 3 by the terminal device, and a bandwidth of resources occupied by the message 3, wherein the delay for transmitting the message 3 by the terminal device is greater than the delay for transmitting the message 3 by the second type terminal and the delay for transmitting the message 3 by the third type terminal, and the bandwidth occupied by the terminal device for transmitting the message 3 is less than the bandwidth occupied by the second type terminal for transmitting the message 3 and the bandwidth occupied by the second type terminal for transmitting the message 3.

21. 21. The method of claim 20, further comprising the step of receiving, by the network device, the message 3 from the terminal device, the message 3 further indicating that the terminal device is the first type terminal.

22. 22. The method of claim 15, further comprising the step of: transmitting, by the network device, second indication information to the terminal device, the second indication information indicating that the first type of terminal is authorized to access the network device.

23. before receiving, by the network device, the message 1 from the terminal device on the first random access resource; generating, by the network device, third indication information, the third indication information indicating one or more of the following: a number of receive antennas of a first type terminal that is restricted from accessing the network device, or a duplex mode supported by the network device; sending, by the network device, the third instruction information to the terminal device; 23. The method of any one of claims 15 to 22, further comprising:

24. 24. The method of claim 23, wherein the number of receive antennas indicated by the third indication includes one receive antenna and / or two receive antennas, and the duplex mode indicated by the third indication includes half-duplex frequency division duplex.

25. The third instruction information includes first sub-indication information, the first sub-indication information indicates the number of receiving antennas of a first type of terminal that is restricted from accessing the network device, and the first sub-indication information further indicates the number of transmitting / receiving antennas of a second type of terminal that is restricted from accessing the network device, or 25. The method according to claim 23 or 24, wherein the third instruction information includes second sub-indication information, and the second sub-indication information indicates the number of receiving antennas of a first type of terminal that is restricted from accessing the network device.

26. 25. The method of claim 23 or 24, wherein the third indication information includes third sub-indication information, the third sub-indication information indicating a duplex mode of a first type of terminal supported by the network device, and the third sub-indication information further indicating a duplex mode of a second type of terminal supported by the network device.

27. 1. A communication method comprising: determining, by a terminal device, second random access resources, the terminal device being an enhanced reduced capacity first type terminal, the second random access resources including first type random access resources applicable to the second type terminal and applicable to a first characteristic set, the second type terminal being a reduced capacity terminal, the first characteristic set including one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission; sending, by the terminal device, a message 1 to the network device on the second random access resource, the message 1 being used by the terminal device for random access to the network device; A method comprising:

28. The step of determining, by the terminal device, the second random access resource includes:

26. The method of claim 25, comprising determining, by the terminal device, the second random access resource from the first type of random access resource when a second type of random access resource applicable to the first type of terminal and applicable to the first characteristic set is not configured for the terminal device.

29. 29. The method of claim 27 or 28, further comprising: receiving, by the terminal device, first information from the network device, the first information indicating that the first type of random access resource is applicable to the first type terminal and an SDT procedure triggered by the first type terminal.

30. 30. The method of claim 29, wherein the first information is carried in a feature combination field.

31. the first type terminal includes a first type terminal supporting a first type capability or a first type terminal supporting a second type capability, a maximum transmission rate of the first type terminal supporting the first type capability is smaller than a transmission rate of the second type terminal, the maximum transmission rate of the first type terminal supporting the first type capability is determined based on a first parameter, a baseband bandwidth of a data transmission channel of the first type terminal supporting the first type capability is smaller than a baseband bandwidth of a data transmission channel of the second type terminal, the maximum transmission rate of the first type terminal supporting the second type capability is smaller than the transmission rate of the second type terminal, and the maximum transmission rate of the first type terminal supporting the first type capability is determined based on a second parameter; 31. The method of any one of claims 27 to 30, wherein the first parameters comprise one or more of the following: a number of transport layers, a scaling factor, a modulation order, and a first threshold; and the second parameters comprise one or more of the following: a number of transport layers, a scaling factor, a modulation order, and a second threshold.

32. 32. The method of claim 31 , further comprising: receiving, by the terminal device, second information from the network device, the second information indicating that the first type of random access resource is applicable to the first type terminal supporting the first type capability and to an SDT procedure triggered by the first type terminal supporting the first type capability.

33. 1. A communication method comprising:

10. A method comprising: receiving, by a network device, a message 1 from a terminal device on a second random access resource, wherein the terminal device is an enhanced capacity-reduced first type terminal, the second random access resource includes a first type random access resource applicable to the second type terminal and applicable to a first characteristic set, the second type terminal is a reduced capacity terminal, the first characteristic set includes small data transmission, network slicing, or message 3 retransmission, and the message 1 is used by the terminal device for random access to the network device.

34. receiving, by the network device, the message 1 from the terminal device on the second random access resource; 34. The method of claim 33, comprising receiving, by the network device, the message 1 from the terminal device on a random access resource of the first type when a random access resource of a second type used for the terminal of the first type and applicable to the first characteristic set is not configured for the terminal device.

35. 35. The method of claim 33 or 34, further comprising: transmitting, by the network device, first information to the terminal device, the first information indicating that the first type of random access resource is applicable to the first type terminal and an SDT procedure triggered by the first type terminal.

36. 36. The method of claim 35, wherein the first information is carried in a feature combination field.

37. the first type terminal includes a first type terminal supporting a first type capability or a first type terminal supporting a second type capability, a maximum transmission rate of the first type terminal supporting the first type capability is smaller than a transmission rate of the second type terminal, the maximum transmission rate of the first type terminal supporting the first type capability is determined based on a first parameter, a baseband bandwidth of a data transmission channel of the first type terminal supporting the first type capability is smaller than a baseband bandwidth of a data transmission channel of the second type terminal, the maximum transmission rate of the first type terminal supporting the second type capability is smaller than the transmission rate of the second type terminal, and the maximum transmission rate of the first type terminal supporting the first type capability is determined based on a second parameter; 37. The method of any one of claims 33 to 36, wherein the first parameters comprise one or more of the following: a number of transport layers, a scaling factor, a modulation order, and a first threshold; and the second parameters comprise one or more of the following: a number of transport layers, a scaling factor, a modulation order, and a second threshold.

38. 38. The method of claim 37, further comprising: transmitting, by the network device, second information to the terminal device, the second information indicating that the first type of random access resource is applicable to the first type terminal supporting the first type capability and to an SDT procedure triggered by the first type terminal supporting the first type capability.

39. 1. A communication method comprising: determining, by a terminal device, a third random access resource, when the terminal device is an enhanced capacity reduced first type terminal and a random access resource set configured by a network device includes a random access resource applicable to the first type terminal, the third random access resource being a random access resource in the random access resource set applicable to the first type terminal; sending, by the terminal device, a message 1 to the network device on the third random access resource; A method comprising:

40. 40. The method of claim 39, wherein when the random access resource set further includes a random access resource applicable to at least one characteristic in a first characteristic set, the third random access resource is a random access resource applicable to the first type terminal and a characteristic used to trigger the terminal device to perform random access in the random access resource set, and the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

41. 41. The method of claim 40, wherein when the random access resource set includes a random access resource applicable to a second type terminal and does not include a random access resource applicable to the first type terminal, the third random access resource is a random access resource in the random access resource set applicable to the second type terminal.

42. 40. The method of claim 39, wherein when the random access resource set further includes a random access resource applicable to at least one characteristic in a first characteristic set, the third random access resource is a random access resource applicable to the first type of terminal by the network device and a characteristic in the random access resource set used to trigger the terminal device to perform random access, the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

43. 43. The method of claim 40, wherein the terminal device selects the third random access resource from the random access resource set based on the characteristic used to trigger the terminal device to perform random access.

44. 1. A communication method comprising:

1. A method comprising: receiving, by a network device, a message 1 from a terminal device on a third random access resource, the terminal device being an enhanced capability reduced first type terminal, the third random access resource being a random access resource applicable to the first type terminal within a random access resource set configured by the network device.

45. 45. The method of claim 44, wherein when the random access resource set further includes a random access resource applicable to at least one characteristic in a first characteristic set, the third random access resource is a random access resource applicable to the first type terminal and a characteristic in the random access resource set used to trigger the terminal device to perform random access, the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

46. 45. The method of claim 44, wherein when the random access resource set includes a random access resource applicable to a second type terminal and does not include a random access resource applicable to the first type terminal, the third random access resource is a random access resource in the random access resource set applicable to the second type terminal.

47. 47. The method of claim 46, wherein when the random access resource set further includes a random access resource applicable to at least one characteristic in a first characteristic set, the third random access resource is a random access resource applicable to the first type terminal by the network device and a characteristic in the random access resource set used to trigger the terminal device to perform random access, the characteristic used to trigger the terminal device to perform random access is a characteristic in the first characteristic set, and the first characteristic set includes one or more of the following characteristics: small data transmission (SDT), network slicing, or message 3 retransmission.

48. 1. A communication method comprising: determining, by the terminal device, a fourth random access resource, the fourth random access resource being a random access resource within a random access resource set configured by the network device and applicable to a second characteristic set, the second characteristic set being a set of characteristics used to trigger the terminal device to perform random access; or the fourth random access resource is a random access resource applicable to a part of the characteristics of the second characteristic set and applicable to the first characteristic, and / or the fourth random access resource is a random access resource applicable to the second characteristic in the random access resource set; the first characteristic is a characteristic having the highest priority among all first-type characteristics applicable to all random access resources whose applicable characteristics are part of the characteristics of the second characteristic set, and the second characteristic is a characteristic of a terminal of a first type of enhanced capacity reduction applicable to random access resources in the random access resource set, a characteristic of a terminal of a second type of capacity reduction, or a characteristic having a higher priority between a characteristic of a terminal of a first type of enhanced capacity reduction and a characteristic of a terminal of a second type of capacity reduction; sending, by the terminal device, a message 1 to the network device on the fourth random access resource; A method comprising:

49. 49. The method of claim 48, wherein the terminal device is a first type terminal.

50. 1. A communication method comprising: receiving, by the network device, a message 1 from the terminal device on a fourth random access resource, the fourth random access resource being a random access resource within a random access resource set configured by the network device and applicable to a second set of characteristics, the second set of characteristics being a set of characteristics used to trigger the terminal device to perform random access; or the fourth random access resource is a random access resource applicable to a part of the characteristics of the second characteristic set and applicable to the first characteristic, and / or the fourth random access resource is a random access resource applicable to the second characteristic in the random access resource set; the first characteristic is a characteristic having the highest priority among all first-type characteristics applicable to all random access resources whose applicable characteristics are part of the characteristics of the second characteristic set, and the second characteristic is a characteristic of a terminal of a first type of enhanced capability reduction applicable to random access resources in the random access resource set, a characteristic of a terminal of a second type of capability reduction, or a characteristic having a higher priority between a characteristic of a terminal of a first type of enhanced capability reduction and a characteristic of a terminal of a second type of capability reduction.

51. 51. The method of claim 50, wherein the terminal device is a first type terminal.

52. A communication device, 51. A communications device, the communications device being configured to perform a random access resource selection method according to any one of claims 1 to 26, or the communications device being configured to perform a communications method according to any one of claims 27 to 38, or the communications device being configured to perform a communications method according to any one of claims 39 to 51.

53. A communication device including a processor and a memory, 52. A communications device, the memory configured to store computer instructions that, when executed by the processor, cause the communications device to perform a random access resource selection method as claimed in any one of claims 1 to 26, or that, when executed by the processor, cause the communications device to perform a communications method as claimed in any one of claims 27 to 38, or that the communications device is configured to perform a communications method as claimed in any one of claims 39 to 51.

54. A communication device including a processor and an interface circuit, the interface circuitry is configured to receive code instructions and transmit the code instructions to the processor; 52. A communications device, wherein the processor is configured to execute the code instructions to perform the random access resource selection method of any one of claims 1 to 26, or to perform the communications method of any one of claims 27 to 38, or the communications device is configured to perform the communications method of any one of claims 39 to 51.

55. A communications device including a processor and a transceiver, 52. A communications device, wherein the transceiver is configured to exchange information between the communications device and other communications devices, and the processor is configured to execute program instructions to perform a random access resource selection method as claimed in any one of claims 1 to 26, or to perform a communications method as claimed in any one of claims 27 to 38, or the communications device is configured to perform a communications method as claimed in any one of claims 39 to 51.

56. 1. A computer-readable storage medium, comprising: The computer-readable storage medium includes a computer program or instruction, 52. A computer-readable storage medium, the computer program or the instructions being configured, when executed on a computer, to cause the computer to perform the random access resource selection method of any one of claims 1 to 26, or to cause the computer to perform the communication method of any one of claims 27 to 38, or to cause the communication device to perform the communication method of any one of claims 39 to 51.

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