Communication method and communication device

Abstract

A communication method and a communication device. The method comprises: a first device receives first information, the first information indicating a first resource and indicating whether to perform random access on the first resource; and then on the basis of the first information, the first device performs random access or does not perform random access on the first resource. The first resource comprises a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit comprises a first sub-band for uplink transmission and a second sub-band for downlink transmission, and the first frequency domain resource is located in the first frequency domain unit.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 5, 2024, with application number 202410168567.3 and invention name “A Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to a communication method and a communication device. Background Art

[0003] With the rapid development of the fifth-generation mobile communication technology, new radio (NR), a variety of communication needs have emerged. To meet the needs of emerging services, a full-duplex (FD) solution has been proposed to improve the uplink coverage of the time-division duplex (TDD) system.

[0004] Random access is a step in the process of connecting a terminal device to the network. This process allows the terminal device to synchronize uplink time with the network device. For initial access, the terminal device can establish a radio resource control (RRC) connection with the network device through this process, enabling the transmission of uplink and downlink service data. Currently, random access (RA) is supported for terminal devices on subband full-duplex (SBFD) symbols / timeslots. However, during random access on SBFD symbols / timeslots, uplink and downlink transmissions can interfere with each other, affecting transmission performance.

[0005] Summary of the Invention

[0006] In order to solve the above technical problems, the present application provides a communication method and a communication device to improve random access performance.

[0007] In the first aspect, a communication method is provided. The method can be executed by a first device, or it can also be executed by other entities, and this application does not limit this. For the convenience of description, the following is an example of execution by the first device. Among them, the first device can be a terminal device, or a chip or circuit in the terminal device (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system in package (SIP) chip containing a modem core), etc., or a functional module in the terminal device that can call and execute a program, etc.

[0008] The method includes: receiving first information, the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource correspond to each other, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, and the first information also indicates whether random access is performed on the first resource; according to the first information, random access or no random access is performed on the first resource.

[0009] In a second aspect, a communication method is provided. The method can be performed by a second device, or it can also be performed by other entities, and this application does not limit this. For the convenience of description, the following is an example of execution by the second device. The second device can be a network device, or a chip or circuit in the network device, or a central unit (CU) or distributed unit (DU) in the network device, or a functional module in the network device that can call and execute a program. Exemplarily, the network device includes a base station.

[0010] The method includes: determining first information, the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource correspond to each other, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, and the first information also indicates whether random access is performed on the first resource; sending the first information.

[0011] Exemplarily, the first time domain unit includes a sub-band full duplex (SBFD) time domain unit (eg, an SBFD time slot or an SBFD symbol), or a single frequency full duplex (SFFD) time unit (eg, an SFFD time slot or an SFFD symbol).

[0012] For example, in the frequency domain, the second subband may be located above or below the first subband. Optionally, the second subband may include a third subband and a fourth subband, and the third subband and the fourth subband are located on both sides of the first subband in the time domain.

[0013] Exemplarily, the first device may be an inactive terminal, an idle terminal, or a connected terminal, and this application does not limit the activation state or connection state of the first device. Optionally, the first device supports sub-band duplexing, including SBFD and SFFD.

[0014] According to the above scheme, the second device can determine and indicate the first resource to the first device, and indicate whether to randomly access the first resource. Correspondingly, the first device can determine the location of the first resource by interpreting the information from the second device, and at the same time determine whether to randomly access the first resource. In this implementation method, the second device can decide whether the first resource is used for the initial access of the first device based on the cross-link interference (CLI) interference situation of the cell evaluated by itself, especially the initial access of an inactive terminal or an idle terminal. This can effectively control the CLI interference level caused by the random access of the first device in the cell, and improve the random access performance of the first device.

[0015] In certain implementations of the first aspect or the second aspect, the first information includes second information and third information, the second information indicates the first resource, and the third information indicates whether random access is performed on the first resource.

[0016] Based on the above scheme, the second device can use the first information to simultaneously indicate the first resource and indicate whether random access is performed on the first resource, or the second device can also use the second information and the third information to respectively indicate the first resource and indicate whether random access is performed on the first resource, further subdivide the first information, and provide multiple possible implementation methods.

[0017] In certain implementations of the first aspect or the second aspect, random access or non-random access on the first resource is performed according to the first information, including: when the first information indicates random access on the first resource and the first device is in an idle state or an inactive state, the first device randomly accesses the first resource.

[0018] Based on the above scheme, for an idle terminal or an inactive terminal, if the first information indicates random access on the first resource, the first device randomly accesses the first resource. In particular, considering that the second device cannot control the CLI interference caused by the idle terminal or the inactive terminal, the first information indicates whether the first device can randomly access the first resource, that is, contention based random access (CBRA), so as to simultaneously take into account the initial random access performance of the idle terminal or the inactive terminal and the effective control of CLI interference.

[0019] Optionally, when the first information indicates random access on the first resource and the first device is in a non-idle state or a connected state, the first device randomly accesses the first resource.

[0020] In certain implementations of the first aspect or the second aspect, random access or non-random access on the first resource is performed according to the first information, including: when the first information indicates random access on the first resource and the first device is in a non-idle state, the first device does not randomly access the first resource.

[0021] Based on the above scheme, for non-idle terminals or inactive terminals, if the first information indicates random access on the first resource, the first device randomly accesses the first resource. In particular, considering that the second device cannot control the CLI interference caused by the idle terminal or the inactive terminal, the first information indicates whether the first device can randomly access the first resource, so as to take into account the initial random access performance of the idle terminal or the inactive terminal and the effective control of CLI interference.

[0022] Optionally, when the first information indicates random access on the first resource and the first device is in a non-idle state, the first device does not perform CBRA on the first resource and may perform contention free random access (CFRA).

[0023] Optionally, when the first information indicates no random access on the first resource, and / or the first device is in a non-idle state or an activated state, the first device does not randomly access the first resource.

[0024] In certain implementations of the first aspect or the second aspect, the second part of the first time domain resource is located in the second time domain unit, the second part is the time domain resource of the second resource, and the second time domain unit is only used for uplink transmission; wherein, the first information indicates no random access on the second resource; or, in the case where the second resource partially overlaps with the third resource, the first information indicates random access on the non-overlapping resource, the non-overlapping resource is a resource that does not overlap at all between the second resource and the third resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured; or, in the case where the second resource does not overlap with the third resource, the first information indicates random access on the second resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

[0025] Exemplarily, the second time domain unit includes an uplink (UL) time domain unit, such as a UL time slot or a UL symbol.

[0026] Based on the above scheme, for the random access resources located in the SBFD time domain unit and the UL time domain unit, the second device can instruct the first device through the first information not to use the random access resources on the UL time domain unit for random access, or instruct the first device to perform random access on the non-overlapping random access resources on the UL time domain unit, so as to increase the resources for random access of the first device as much as possible, thereby enhancing the access capability of the first device. At the same time, instructing the first device not to perform random access on the overlapping random access resources on the UL time domain unit can effectively control signal transmission interference.

[0027] In certain implementations of the first aspect or the second aspect, the method further includes: when the first information indicates random access on the first resource, determining a first time-frequency physical random access channel occasion (PRACH occasion, RO) from the first resource; and sending a preamble code on the first RO.

[0028] Exemplarily, the first information is further used to indicate that the first RO is used for CBRA; or, the first information is further used to indicate that the first RO is used for CFRA.

[0029] Based on the above solution, when the first information indicates random access on the first resource, the first device can select a first RO from the first resource to send a random access preamble to implement random access. Furthermore, based on the first information indicating that the first RO is used for CBRA or CFRA, the first device can selectively select random access in the CBRA or CFRA manner to ensure random access performance while minimizing signal interference.

[0030] In a third aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0031] The method includes: receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit; obtaining second information, determining a first RO based on the first information and the second information, the first RO being located in the first resource; and randomly accessing the first RO.

[0032] Exemplarily, the first time domain unit includes an SBFD time domain unit (e.g., an SBFD time slot or an SBFD symbol), or a single frequency full duplex (SFFD) time unit (e.g., an SFFD time slot or an SFFD symbol), and the second time domain unit includes an uplink (UL) time domain unit, such as a UL time slot or a UL symbol.

[0033] For example, in the frequency domain, the second sub-band may be located above or below the first sub-band. Optionally, the second sub-band includes a third sub-band and a fourth sub-band, and the third sub-band and the fourth sub-band are located on both sides of the first sub-band in the time domain.

[0034] According to the above solution, the first device can determine the first resource for random access by receiving the first information, and can also determine the first RO from the first resource in combination with the second information. For example, the first device can send a random access preamble on the first RO to achieve uplink synchronization and complete the random access process. This implementation method selects the first RO for random access based on the second information, effectively controlling the CLI interference level caused by the random access of the first device in the cell, while improving the random access performance of the first device.

[0035] In certain implementations of the third aspect, obtaining the second information includes: receiving the second information from the second device, that is, the second device may indicate the second information to the first device through signaling.

[0036] Optionally, the second information may be predefined or preconfigured, which is not limited in this application.

[0037] In certain implementations of the third aspect, the second information indicates a first threshold, and the first threshold includes one or more of the following: a reference signal receiving power (RSRP) threshold, a path loss threshold, or a transmit power threshold; determining the first RO based on the first information and the second information includes: obtaining a first measurement result; determining a first comparison result based on the first measurement result and the first threshold; determining the first RO based on the first comparison result and a first mapping relationship, the first mapping relationship indicating a mapping relationship between M comparison results and N RO sets, the M comparison results include the first comparison result, the first resource includes N RO sets, the N RO sets include the first RO set, the first RO set includes the first RO, and M and N are both integers greater than or equal to 1.

[0038] Based on the above solution, a comparison result is obtained by comparing the signal measurement result with the first threshold, thereby determining a corresponding RO set and selecting a first RO for random access from the RO set to achieve uplink synchronization and complete the random access process. The first RO determined for random access in this manner can not only effectively control the CLI interference level caused by random access by the first device in the cell, but also improve the random access performance of the first device.

[0039] In certain implementations of the third aspect, the second information indicates a frequency distance threshold, and determining the first RO based on the first information and the second information includes: determining the first RO based on a first comparison result and a second comparison result, the first comparison result being a comparison result of the frequency distance threshold and the first distance, the second comparison result being a comparison result of the frequency distance threshold and the second distance, the first distance being a distance between the first RO and a first frequency point, the second distance being a distance between the second RO and the first frequency point, and the first frequency point being located in the second sub-band.

[0040] Optionally, the first frequency point may be located in the first sub-band, for example, a frequency point adjacent to a downlink sub-band.

[0041] Based on the above scheme, the first device determines the first RO for random access by comparing the distances between multiple ROs (for example, the first RO and the second RO) and the first frequency point, and the size relationship between the distances and the frequency distance threshold. The first RO for random access determined in this way can not only effectively control the CLI interference level caused by the random access of the first device in the cell, but also improve the random access performance of the first device.

[0042] It should be understood that the distance between the first RO and the first frequency point (i.e., the first distance) is greater than or equal to the frequency distance threshold, and the distance between the second RO and the first frequency point (i.e., the second distance) is less than or equal to the frequency distance threshold; or, the first distance is greater than or equal to the frequency distance threshold, the second distance is greater than or equal to the frequency distance threshold, and the first distance is greater than or equal to the second distance. In this case, the second RO can also be used for random access. In comparison, the effect of using the first RO for random access is better.

[0043] In certain implementations of the third aspect, the second information indicates a frequency distance threshold, and determining the first RO based on the first information and the second information includes: randomly selecting an RO from a set of ROs that meet a distance comparison requirement as the first RO, and a distance between the first RO and the first frequency point (i.e., the first distance) satisfies a relationship with the frequency distance threshold.

[0044] Optionally, the first frequency point may be located in the first sub-band, for example, a frequency point adjacent to a downlink sub-band.

[0045] Based on the above solution, the first device can select one or more ROs associated with the SSB, and arbitrarily select an RO from them, calculate the distance between the RO and the first frequency point, and if the distance is greater than or equal to the frequency distance threshold, the first device can use the first RO for random access. In this case, the distance between other ROs in the first resource and the first frequency point, as well as the relationship between the distance and the frequency distance threshold, can no longer be considered. Compared with the above-mentioned comparison of the distances between multiple ROs and the first frequency point, as well as the relationship between the distance and the frequency distance threshold, to ultimately determine the first RO, this implementation method can reduce the random access delay of the first device and improve random access performance while effectively controlling CLI interference.

[0046] In certain implementations of the third aspect, the second information indicates a frequency distance threshold; when the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, the first RO is used for contention-based random access (CBRA), and the second frequency point is located in the second subband; or, when the distance between the first RO and the second frequency point is less than the frequency distance threshold, the first RO is used for contention-free random access (CFRA).

[0047] Optionally, the second frequency point may be located in the first sub-band, for example, a frequency point adjacent to a downlink sub-band.

[0048] Based on the above solution, if the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, it indicates that the performance of random access on the first RO is high and the cross-link interference is low, and the first RO can be used for CBRA. Conversely, if the distance between the first RO and the second frequency point is less than the frequency distance threshold, it indicates that the performance of random access on the first RO is poor and the cross-link interference is large, and the first RO can be used for CFRA. This implementation method can effectively control the CLI interference level caused by random access of the first device in the cell and improve the random access performance of the first device.

[0049] In a fourth aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0050] The method includes: receiving first information, the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first subband; obtaining a first measurement resource, the first measurement resource includes a second time domain resource and a second frequency domain resource, the second time domain resource and the second frequency domain resource correspond to each other, the second time domain resource is located in the first time domain unit, and the second frequency domain resource is located in the second subband; measuring the signal strength on the first measurement resource to obtain a first measurement result; and determining whether to perform random access on the first resource based on the first measurement result.

[0051] Optionally, the resources used for signal measurement (eg, first measurement resources) may be periodic, or in other words, the present application does not limit the number of first measurement resources.

[0052] Optionally, the resources used for signal measurement (eg, first measurement resources) may be located in a SBFD time domain unit, such as a SBFD time slot or a SBFD symbol, and the frequency domain resources may be located in a resource element (RE) corresponding to the SBFD time domain unit.

[0053] Based on the above solution, the first device obtains a first measurement resource and performs signal monitoring on the first measurement resource to obtain a first measurement result. Based on the first measurement result, the first device then determines whether to perform random access on the first resource. In this implementation, the decision on whether to use the first resource for random access is based on the strength of the signal interference detected by the first device. This effectively controls the level of CLI interference caused by random access by the first device within the cell, thereby improving the random access performance of the first device.

[0054] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource according to the first measurement result includes: performing random access on the first resource if the first measurement result is greater than or equal to a first signal strength threshold.

[0055] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource according to the first measurement result includes: if the first measurement result is less than a first signal strength threshold, not performing random access on the first resource.

[0056] Based on the above scheme, by comparing the size relationship between the first measurement result and the first signal strength threshold, it is determined whether to randomly access the first resource. For example, when the first measurement result is greater than or equal to the first signal strength threshold, it means that the downlink signal is strong enough, and the first device can use the first resource for random access; conversely, when the first measurement result is less than the first signal strength threshold, it means that the downlink signal is weak enough, and the first device does not use the first resource for random access, which can effectively reduce the interference caused by the random access of the first device and ensure the random access performance of the first device.

[0057] In certain implementations of the fourth aspect, the method also includes: obtaining a second measurement resource, the second measurement resource includes a third time domain resource and a third frequency domain resource, the third time domain resource and the third frequency domain resource correspond to each other, the third time domain resource is located in the first time domain unit, and the third frequency domain resource is located in the first subband; measuring the signal strength on the second measurement resource to obtain a second measurement result; and determining whether to perform random access on the first resource based on the first measurement result and the second measurement result.

[0058] Based on the above solution, a second measurement resource located within the first subband is introduced. Signal monitoring is performed on the second measurement resource to obtain a second measurement result. Based on the first and second measurement results, a determination is then made as to whether to perform random access on the first resource. In this implementation, the decision on whether to use the first resource for random access is based on the strength of signal interference detected by the first device. This effectively controls the level of CLI interference caused by random access by the first device within the cell, thereby improving the random access performance of the first device.

[0059] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the first measurement result and the second measurement result includes: when the first measurement result is greater than or equal to the first signal strength threshold and the second measurement result is less than or equal to the second signal strength threshold, performing random access on the first resource.

[0060] Based on the above scheme, by comparing the size relationship between the first measurement result and the first signal strength threshold, and the size relationship between the second measurement result and the second signal strength threshold, it is determined whether to randomly access the first resource. For example, when the first measurement result is greater than or equal to the first signal strength threshold, it means that the downlink signal is strong enough. At the same time, when the second measurement result is less than or equal to the second signal strength threshold, it means that the uplink signals of other UEs interfere with the downlink signal at this frequency position weakly enough. In this case, the first device can use the first resource for random access, which can effectively reduce the interference caused by the random access of the first device and ensure the random access performance of the first device.

[0061] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the first measurement result and the second measurement result includes: when the first measurement result is less than a first signal strength threshold and / or the second measurement result is greater than a second signal strength threshold, not performing random access on the first resource.

[0062] Based on the above scheme, by comparing the size relationship between the first measurement result and the first signal strength threshold, and the size relationship between the second measurement result and the second signal strength threshold, it is determined whether to randomly access the first resource. For example, when the first measurement result is less than the first signal strength threshold, it means that the downlink signal is weak enough. In addition, when the second measurement result is greater than the second signal strength threshold, it means that the uplink signals of the remaining UEs interfere strongly enough with the downlink signal at the frequency position. In this case, the first device does not use the first resource for random access, thereby avoiding interference caused by random access of the first device.

[0063] In certain implementations of the fourth aspect, the second subband includes a third subband and a fourth subband, and the third subband and the fourth subband are respectively located on both sides of the first subband in the frequency domain; a third measurement resource is obtained, the third measurement resource includes a fourth time domain resource and a fourth frequency domain resource, the fourth time domain resource and the fourth frequency domain resource correspond to each other, the fourth time domain resource is located in the first time domain unit, the fourth frequency domain resource is located in the third subband, and the second frequency domain resource is located in the fourth subband; the signal strength is measured on the third measurement resource to obtain a third measurement result; and based on the first measurement result and the third measurement result, it is determined whether to randomly access the first resource.

[0064] Based on the above solution, a third measurement resource located within the third subband is introduced. Signal monitoring is performed on the third measurement resource to obtain a third measurement result. Based on the first and third measurement results, a determination is then made as to whether to perform random access on the first resource. In this implementation, the decision on whether to use the first resource for random access is based on the strength of signal interference detected by the first device. This effectively controls the level of CLI interference caused by random access by the first device within the cell, thereby improving the random access performance of the first device.

[0065] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the first measurement result and the third measurement result includes: when the first measurement result is greater than or equal to the first signal strength threshold and the third measurement result is greater than or equal to the third signal strength threshold, performing random access on the first resource.

[0066] Optionally, the first signal strength threshold and the third signal strength threshold may be the same or different, which is not limited in this application.

[0067] Based on the above scheme, by comparing the size relationship between the first measurement result and the first signal strength threshold, as well as the size relationship between the third measurement result and the third signal strength threshold, it is determined whether to perform random access on the first resource. For example, when the first measurement result is greater than or equal to the first signal strength threshold, and when the third measurement result is greater than or equal to the third signal strength threshold, it indicates that the downlink signal is strong enough, then the first device can use the first resource for random access, which can avoid interference caused by the random access of the first device and improve the random access performance of the first device.

[0068] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the first measurement result and the third measurement result includes: when the first measurement result is less than a first signal strength threshold, and / or the third measurement result is less than a third signal strength threshold, not performing random access on the first resource.

[0069] Based on the above scheme, by comparing the size relationship between the first measurement result and the first signal strength threshold, as well as the size relationship between the third measurement result and the third signal strength threshold, it is determined whether to randomly access the first resource. For example, when the first measurement result is less than the first signal strength threshold, or the third measurement result is less than the third signal strength threshold, indicating that the downlink signal is weak enough, the first device does not use the first resource for random access, thereby avoiding interference caused by random access of the first device.

[0070] In certain implementations of the fourth aspect, without random access on the first resource, a fourth measurement resource is obtained, the fourth measurement resource includes a fifth time domain resource and a fifth frequency domain resource, the fifth time domain resource and the fifth frequency domain resource correspond to each other, the fifth time domain resource is located in the first time domain unit, and the fifth frequency domain resource is located in the third sub-band; a fifth measurement resource is obtained, the fifth measurement resource includes a sixth time domain resource and a sixth frequency domain resource, the sixth time domain resource and the sixth frequency domain resource correspond to each other, the sixth time domain resource is located in the first time domain unit, and the sixth frequency domain resource is located in the fourth sub-band; the signal strength is measured on the fourth measurement resource to obtain a fourth measurement result; the signal strength is measured on the fifth measurement resource to obtain a fifth measurement result; and based on the fourth measurement result and the fifth measurement result, it is determined whether to perform random access on the first resource.

[0071] It should be noted that the third measurement resource and the fourth measurement resource are located in the third subband and are different from each other, and the fifth measurement resource and the second measurement resource are located in the fourth subband and are different from each other. Optionally, the first measurement resource and the third measurement resource can be considered as a group of measurement resources, and the fourth measurement resource and the fifth measurement resource can be considered as a group of measurement resources. In other words, when the first device finds that the interference is high after measuring the signal on the first group of measurement resources, it can continue to measure the next group of measurement resources until it finds a measurement resource with lower interference intensity, and then perform random access on the random access resource after the measurement resource. This ensures random access performance while effectively controlling CLI interference.

[0072] Based on the above solution, a fourth measurement resource located within the third subband and a fifth measurement resource located within the fourth subband are introduced. Signal monitoring is performed on the fourth measurement resource to obtain a fourth measurement result, and signal monitoring is performed on the fifth measurement resource to obtain a fifth measurement result. Based on the fourth and fifth measurement results, a determination is then made as to whether to perform random access on the first resource. In this implementation, the decision on whether to use the first resource for random access is made based on the strength of signal interference detected by the first device. This effectively controls the level of CLI interference caused by random access by the first device within the cell, thereby improving the random access performance of the first device.

[0073] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the fourth measurement result and the fifth measurement result includes: when the fourth measurement result is greater than or equal to a fourth signal strength threshold and the fifth measurement result is greater than or equal to a fifth signal strength threshold, performing random access on the first resource.

[0074] Optionally, the fourth signal strength threshold and the fifth signal strength threshold may be the same or different, which is not limited in this application.

[0075] Based on the above scheme, by comparing the size relationship between the fourth measurement result and the fourth signal strength threshold, as well as the size relationship between the fifth measurement result and the fifth signal strength threshold, it is determined whether to perform random access on the first resource. For example, when the fourth measurement result is greater than or equal to the fourth signal strength threshold, and when the fifth measurement result is greater than or equal to the fifth signal strength threshold, it indicates that the downlink signal is strong enough, then the first device can use the first resource for random access, which can avoid interference caused by the random access of the first device and improve the random access performance of the first device.

[0076] In certain implementations of the fourth aspect, determining whether to perform random access on the first resource based on the fourth measurement result and the fifth measurement result includes: randomly accessing the first resource when the fourth measurement result is less than a fourth signal strength threshold and / or the fifth measurement result is less than a fifth signal strength threshold.

[0077] Based on the above scheme, by comparing the size relationship between the fourth measurement result and the fourth signal strength threshold, as well as the size relationship between the fifth measurement result and the fifth signal strength threshold, it is determined whether to randomly access the first resource. For example, when the fourth measurement result is less than the fourth signal strength threshold, or the fifth measurement result is less than the fifth signal strength threshold, indicating that the downlink signal is weak enough, the first device does not use the first resource for random access, thereby avoiding interference caused by random access of the first device.

[0078] In a fifth aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0079] The method includes: acquiring a first resource and a second resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource correspond to each other, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, the time domain resource of the second resource is located on the second time domain unit, and the second resource is predefined or preconfigured.

[0080] The time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

[0081] The format length of the random access preamble sent on the first resource and the second resource is greater than the format length of the random access preamble sent on the third resource; or the first resource and the second resource support physical random access channel (PRACH) repeated transmission, and the third resource does not support PRACH repeated transmission, or the maximum number of PRACH repeated transmissions supported by the first resource and the second resource is different from the maximum number of PRACH repeated transmissions supported by the third resource; or the corresponding RSRP thresholds for determining the number of repetitions (for example, 2, 4, 8, or other values) of the first resource and the second resource are greater than the corresponding RSRP thresholds for determining the number of repetitions (for example, 2, 4, 8, or other values) of the third resource; or the time domain resource corresponding to the RO in the first resource and the second resource is greater than the time domain resource corresponding to the RO in the third resource, or the preamble length corresponding to the first resource and the second resource is greater than the preamble length corresponding to the third resource; or the maximum transmit power on the first resource and the second resource (or the maximum transmit power allowed for the UE to transmit PRACH) is less than the maximum transmit power on the third resource (or the maximum transmit power allowed for the UE to transmit PRACH); or the transmit power on the first resource and the second resource is less than the transmit power on the third resource.

[0082] In a sixth aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0083] The method includes: obtaining a first measurement result; determining a first RO or a second RO based on the first measurement result and a first threshold; wherein the first RO is located in a first resource and the second RO is located in a second resource; wherein the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, a second part of the first time domain resource is located in a second time domain unit, the second part is a time domain resource of the second resource, and the second time domain unit is only used for uplink transmission.

[0084] Exemplarily, the first time domain unit includes an SBFD time domain unit (e.g., an SBFD time slot or an SBFD symbol), or an SFFD time unit (e.g., an SFFD time slot or an SFFD symbol), and the second time domain unit includes a UL time domain unit, such as a UL time slot or a UL symbol.

[0085] In certain implementations of the sixth aspect, a first apparatus obtains second information, where the second information indicates a first threshold, where the first threshold includes one or more of the following: an RSRP threshold, a path loss threshold, or a transmit power threshold. The second information may be predefined or preconfigured, or may be indicated by the second apparatus through signaling.

[0086] Based on the above solution, the first device obtains a first measurement result through signal measurement, and determines random access on the first resource or random access on the second resource by comparing the first measurement result with a first threshold.

[0087] In certain implementations of the sixth aspect, determining the first RO or the second RO based on the first measurement result and the first threshold includes one or more of the following: when the first measurement result is greater than or equal to the RSRP threshold, the first RO is located in the first resource; when the first measurement result is less than or equal to the RSRP threshold, the second RO is located in the second resource; when the first measurement result is less than or equal to the path loss threshold, the first RO is located in the first resource; when the first measurement result is greater than or equal to the path loss threshold, the second RO is located in the second resource; when the first measurement result is less than or equal to the transmit power threshold, the first RO is located in the first resource; or, when the first measurement result is greater than or equal to the transmit power threshold, the second RO is located in the second resource.

[0088] Based on the above scheme, if the first measurement result indicates that the RSRP measurement value is greater than or equal to the RSRP threshold, or the path loss value is less than or equal to the path loss threshold, and the transmit power is less than or equal to the transmit power threshold, it means that the signal quality is high and the CLI interference level is small, which means that the first device can randomly access the first resource; conversely, if the first measurement result indicates that the RSRP measurement value is less than the RSRP threshold, or the path loss value is greater than the path loss threshold, and the transmit power is greater than the transmit power threshold, it means that the signal quality is poor, the path loss is serious, and the CLI interference level is high, which means that the first device can not use the first resource for random access, which can effectively control the CLI interference level caused by the random access of the first device in the cell, and improve the random access performance of the first device.

[0089] In certain implementations of the sixth aspect, determining the first RO or the second RO based on the first measurement result and the first threshold includes one or more of the following: when the first signal measurement result is less than the RSRP threshold, the first RO is located in the first resource; when the first signal measurement result is greater than or equal to the RSRP threshold, the second RO is located in the second resource; when the first signal measurement result is greater than or equal to the path loss threshold, the first RO is located in the first resource; when the first signal measurement result is less than or equal to the path loss threshold, the first RO is located in the second resource; when the first signal measurement result is greater than or equal to the transmit power threshold, the first RO is located in the first resource; or, when the first signal measurement result is less than or equal to the transmit power threshold, the second RO is located in the second resource.

[0090] Based on the above scheme, considering that the PRACH resources on the SBFD time domain unit may be used to expand PRACH coverage, such as using a longer random access preamble code or allowing a larger repetition level, in this case, the judgment logic for determining the PRACH resources used for random access between the first threshold and the first measurement result will change. For example, when the coverage of the first device is limited (for example, the RSRP is small), the first device can select the PRACH resources on the SBFD time domain unit (ie, the first resource). This implementation method can improve the random access performance of the first device.

[0091] In certain implementations of the sixth aspect, the second information indicates a frequency distance threshold; when the first RO is located in the first resource, the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, and the second frequency point is located in the second subband; or, when the second RO is located in the second resource, the distance between the second RO and the second frequency point is less than or equal to the frequency distance threshold, and the second frequency point is located in the second subband.

[0092] Optionally, the second frequency point may also be located in the first sub-band, for example, a frequency point adjacent to the downlink sub-band.

[0093] Based on the above scheme, if the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, it means that the CLI interference level is low, and the first device can randomly access the first resource; conversely, if the distance between the first RO and the second frequency point is less than or equal to the frequency distance threshold, it means that the CLI interference level is high, and the first device can perform random access without using the first resource, which can effectively control the CLI interference level caused by the random access of the first device in the cell and improve the random access performance of the first device.

[0094] In a seventh aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0095] The method includes: receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, the first information also indicating that M of the N FDM-ROs of the first resource are used for contention-based random access (CBRA), where N is greater than or equal to M, and both are positive integers; and / or, the first information indicating that K of the N FDM-ROs of the first resource are used for contention-free random access (CFRA), where K is a positive integer less than or equal to N; determining, based on the first information, CBRA on the M FDM-ROs, and / or, using the K FDM-ROs for CFRA.

[0096] In an eighth aspect, a communication method is provided. The method may be performed by a second device, or may be performed by other entities, and this application does not limit this. For ease of description, the following description is taken as an example of execution by a second device. The second device may be a network device, or a chip or circuit in a network device, or a CU or DU in a network device, or a functional module in a network device that can call and execute a program. Exemplarily, the network device includes a base station.

[0097] The method includes: determining first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, the first information also indicating that M of the N frequency division multiplexing random access opportunities (FDM-RO) of the first resource are used for CBRA, where M is a positive integer less than or equal to N; and / or the first information indicating that K of the N FDM-ROs of the first resource are used for CFRA, where K is a positive integer less than or equal to N; sending the first information.

[0098] Optionally, this application does not limit the size relationship between M and K.

[0099] For example, the value of N may be 1, 2, 4, or 8. The value of M may be {1, 2, 3, 4} or {1, 2, 3, 4, 5, 6, 7, 8}. The value of K may be {1, 2, 3, 4} or {1, 2, 3, 4, 5, 6, 7, 8}.

[0100] Exemplarily, the first time domain unit includes an SBFD time domain unit (eg, an SBFD time slot or an SBFD symbol), or an SFFD time unit (eg, an SFFD time slot or an SFFD symbol).

[0101] For example, in the frequency domain, the second subband may be located above or below the first subband. Optionally, the second subband may include a third subband and a fourth subband, and the third subband and the fourth subband are located on both sides of the first subband in the time domain.

[0102] Exemplarily, the first device may be an inactive terminal, an idle terminal, or a connected terminal, and the present application does not limit the active state or the connected state of the first device. Optionally, the first device supports sub-band duplexing.

[0103] According to the above solution, the second device can determine and indicate the first resource to the first device, as well as whether an RO is used for CBRA or CFRA in the first resource. Correspondingly, the first device can determine the location of the first resource by interpreting the information from the second device, and simultaneously determine that CBRA can be performed on M FDM-ROs in the first resource, and / or determine that CFRA can be performed on K FDM-ROs in the first resource. In this implementation, the second device can determine the RO for CBRA or CFRA in the first resource for the first device based on the CLI interference situation of the cell evaluated by itself, especially for the initial access of an inactive terminal or an idle terminal. This can effectively control the CLI interference level caused by random access of the first device in the cell, thereby improving the random access performance of the first device.

[0104] In certain implementations of the eighth aspect, the M FDM-ROs are the ROs farthest from the second subband among the N FDM-ROs; the sum of the distances between the M FDM-ROs and the second subband is the minimum value of the sum of the distances between any M FDM-ROs among the N FDM-ROs and the second subband.

[0105] For example, assuming M=1 and N=2, it can be understood that: for the two FDM-ROs in the first resource (for example, FDM-RO#1 and FDM-RO#2), the distance between FDM-RO#1 and the second subband is greater than the distance between FDM-RO#2 and the second subband (downlink subband), then FDM-RO#1 is selected.

[0106] For example, assuming M=2, N=4, it can be understood that: the 4 FDM-ROs in the first resource (for example, FDM-RO#1 and FDM-RO#2, FDM-RO#3 and FDM-RO#4), the distance between FDM-RO#1 and FDM-RO#4 and the second subband decreases successively from FDM-RO#1 to FDM-RO#4, then FDM-RO#1 and FDM-RO#2 are selected.

[0107] Based on the above solution, one or more frequency division ROs farthest from the downlink subband may be selected for CBRA, which may reduce CLI.

[0108] In a ninth aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0109] The method includes: receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first subband; obtaining a first measurement resource, the first measurement resource including a second time domain resource and a second frequency domain resource, the second time domain resource and the second frequency domain resource corresponding to each other, the second time domain resource being located in the first time domain unit, and the second frequency domain resource being located in the second subband; measuring signal strength on the first measurement resource to obtain a first measurement result; and determining whether to perform random access on the first resource according to the first measurement result;

[0110] For example, when random access is determined on the first resource, and the second subband can be located above or below the first subband, the first resource is located in the center of the first subband, at the farthest position from the second subband. The resource used to send the random access response (RAR) is located at the bottom of the second subband. The resource used to send message 3 (msg3) is located in the center of the first subband, the resource used to send message 4 (msg4) is located at the bottom of the second subband, and the resource used to send message (msg5) is located at the center of the first subband. In other words, the resource location for sending the PUSCH can be located in the center of the first subband, and the resource location for sending the PDSCH can be located at the bottom of the second subband. This can effectively control CLI interference while improving random access performance.

[0111] For example, when random access is determined on the first resource, if the second subband includes the third and fourth subbands, and the third and fourth subbands are located on either side of the first subband in the time domain, then the first resource can be located in the center of the first subband, farthest from the second subband, the resource used to send the RAR is located at the top of the third subband or the bottom of the fourth subband, the resource used to send msg3 is located in the center of the first subband, the resource used to send msg4 is located at the top of the third subband or the bottom of the fourth subband, or the bottom of the fourth subband, and the resource used to send msg5 is located at the center of the first subband. In other words, the resource location for the first device to send the physical uplink shared channel (PUSCH) can be located in the center of the first subband, and the resource location for the second device to send the physical downlink shared channel (PDSCH) can be located at the top of the third subband or the bottom of the fourth subband. This can effectively control CLI interference while improving random access performance.

[0112] In a tenth aspect, a communication method is provided. This method can be performed by a first device, or by another entity, and this application does not limit this. For ease of description, the following description uses the first device as an example. The first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0113] The method includes: receiving first information, the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource correspond to each other, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, the second part of the first time domain resource is located in the second time domain unit, the second part is the time domain resource of the second resource, the second time domain unit is only used for uplink transmission, the first information also indicates whether random access is performed on the first resource; random access or no random access is performed on the first resource according to the first information.

[0114] Exemplarily, the first information indicates not to perform random access on the second resource; or,

[0115] Exemplarily, when the second resource partially overlaps with the third resource, the first information indicates random access on the non-overlapping resource, the non-overlapping resource is a resource that does not overlap at all between the second resource and the third resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured; or,

[0116] Exemplarily, when the second resource and the third resource do not overlap, the first information indicates random access on the second resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

[0117] In an eleventh aspect, a first apparatus is provided. The communication apparatus has the functions of implementing the first aspect. For example, the communication apparatus includes a module, unit, or means corresponding to performing the operations involved in the first aspect. The module, unit, or means may be implemented by software, hardware, or a combination of software and hardware.

[0118] In one possible design, the first device includes: a transceiver unit for receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, and the first information also indicating whether random access is performed on the first resource; a processing unit for randomly accessing or not randomly accessing the first resource according to the first information.

[0119] The transceiver unit can perform the reception and transmission processing in the aforementioned first aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned first aspect.

[0120] In a twelfth aspect, a second device is provided. The communication device has the functions of implementing the second aspect above. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the second aspect above. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0121] In one possible design, the second device includes: a processing unit for determining first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, and the first information also indicating whether random access is performed on the first resource; a transceiver unit for sending the first information.

[0122] The transceiver unit can perform the reception and transmission processing in the aforementioned second aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned second aspect.

[0123] In a thirteenth aspect, a first device is provided. The communication device has the functions of implementing the third aspect above. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the third aspect above. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0124] In one possible design, the first device includes: a receiving unit for receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit; a processing unit for obtaining second information and determining a first RO based on the first information and the second information, the first RO being located in the first resource; the processing unit is also used for random access on the first RO.

[0125] The transceiver unit can perform the receiving and sending processing in the aforementioned third aspect, and the processing unit can perform other processing except receiving and sending in the aforementioned third aspect.

[0126] In a fourteenth aspect, a first device is provided. The communication device has the functions of implementing the fourth aspect. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the fourth aspect. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0127] In one possible design, the first device includes: a receiving unit for receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first subband; a processing unit for obtaining a first measurement resource, the first measurement resource including a second time domain resource and a second frequency domain resource, the second time domain resource and the second frequency domain resource corresponding to each other, the second time domain resource being located in the first time domain unit, and the second frequency domain resource being located in the second subband; the processing unit is further used to measure the signal strength on the first measurement resource to obtain a first measurement result; the processing unit is further used to determine whether to perform random access on the first resource based on the first measurement result.

[0128] The transceiver unit can perform the receiving and sending processing in the aforementioned fourth aspect, and the processing unit can perform other processing except receiving and sending in the aforementioned fourth aspect.

[0129] In a fifteenth aspect, a first device is provided. The communication device has the functions of implementing the fifth aspect above. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the fifth aspect above. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0130] In one possible design, the first device includes: a processing unit, used to obtain a first resource and a second resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, the time domain resource of the second resource is located on the second time domain unit, and the second resource is predefined or preconfigured. Among them, the format length of the random access preamble code sent on the first resource is greater than the format length of the random access preamble code sent on the second resource; or, the first resource uses PRACH repeated transmission, and the second resource does not use PRACH repeated transmission; or, the reference signal received power RSRP threshold used by the first resource to determine the number of repetitions is greater than the RSRP threshold used by the second resource to determine the number of repetitions; or, the time domain resources of the first resource are greater than the time domain resources of the second resource; or, the maximum transmit power on the first resource (or the maximum transmit power allowed for the UE to use) is less than the maximum transmit power on the second resource; or, the transmit power on the first resource is less than the transmit power on the second resource.

[0131] The transceiver unit can perform the reception and transmission processing in the aforementioned fifth aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned fifth aspect.

[0132] In a sixteenth aspect, a first device is provided. The communication device has the functions of implementing the sixth aspect above. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the sixth aspect above. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0133] In one possible design, the first device includes: a processing unit, used to obtain a first measurement result; the processing unit is also used to determine a first RO or a second RO based on the first measurement result and a first threshold; wherein the first RO is located in the first resource and the second RO is located in the second resource; wherein the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first part of the first time domain resource is located in the first time domain unit, the second part of the first time domain resource is located in the second time domain unit, the second part is the time domain resource of the second resource, and the second time domain unit is only used for uplink transmission.

[0134] The transceiver unit can perform the reception and transmission processing in the aforementioned sixth aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned sixth aspect.

[0135] In a seventeenth aspect, a first device is provided. The communication device has the functions of implementing the seventh aspect above. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the seventh aspect above. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0136] In one possible design, the first device includes: a transceiver unit, used to receive first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, the first information also indicating that M of the N FDM-ROs of the first resource are used for contention-based random access CBRA, where N is greater than or equal to M, and both are positive integers; and / or, the first information indicates that K of the N FDM-ROs of the first resource are used for contention-free random access CFRA, where K is a positive integer less than or equal to N; a processing unit, used to determine, based on the first information, CBRA on the M FDM-ROs, and / or, CFRA on the K FDM-ROs.

[0137] The transceiver unit can perform the receiving and sending processing in the aforementioned seventh aspect, and the processing unit can perform other processing in addition to receiving and sending in the aforementioned seventh aspect.

[0138] In an eighteenth aspect, a second device is provided. The communication device is capable of implementing the functions of the eighth aspect. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the eighth aspect. The module, unit, or means can be implemented through software, hardware, or a combination of software and hardware.

[0139] In one possible design, the second device includes: a processing unit, used to determine first information, the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, the first information also indicates that M of the N FDM-ROs of the first resource are used for CBRA, where M is a positive integer less than or equal to N; and / or, the first information indicates that K of the N FDM-ROs of the first resource are used for CFRA, where K is a positive integer less than or equal to N; a transceiver unit, used to send the first information.

[0140] The transceiver unit can perform the receiving and sending processing in the aforementioned eighth aspect, and the processing unit can perform other processing in addition to receiving and sending in the aforementioned eighth aspect.

[0141] In a nineteenth aspect, a first device is provided. The communication device is capable of implementing the functions of the ninth aspect. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the ninth aspect. The module, unit, or means can be implemented through software, hardware, or a combination of software and hardware.

[0142] In one possible design, the first device includes: a transceiver unit for receiving first information, where the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, and the first time domain resource is located in a first time domain unit, and the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first subband; a processing unit for obtaining a first measurement resource, the first measurement resource includes a second time domain resource and a second frequency domain resource, the second time domain resource and the second frequency domain resource correspond to each other, the second time domain resource is located in the first time domain unit, and the second frequency domain resource is located in the second subband; measuring the signal strength on the first measurement resource to obtain a first measurement result; the processing unit is also used to determine whether to randomly access the first resource based on the first measurement result.

[0143] For example, if random access is determined on the first resource and the second subband can be located above or below the first subband, the first resource is located in the center of the first subband, farthest from the second subband, the resource used to send the RAR is located at the bottom of the second subband, the resource used to send msg3 is located in the center of the first subband, the resource used to send msg4 is located at the bottom of the second subband, and the resource used to send msg5 is located at the center of the first subband. In other words, the resource location for sending the PUSCH can be located in the center of the first subband, and the resource location for sending the PDSCH can be located at the bottom of the second subband, which can effectively control CLI interference while improving random access performance.

[0144] For example, when random access is determined on the first resource, if the second subband includes the third and fourth subbands, and the third and fourth subbands are located on either side of the first subband in the time domain, then the first resource can be located in the center of the first subband, at the farthest position from the second subband, the resource used to send the RAR is located at the top of the third subband or the bottom of the fourth subband, the resource used to send msg3 is located in the center of the first subband, the resource used to send msg4 is located at the top of the third subband or the bottom of the fourth subband, or the bottom of the fourth subband, and the resource used to send msg5 is located in the center of the first subband. In other words, the resource location for the first device to send the PUSCH can be located in the center of the first subband, and the resource location for the second device to send the PDSCH can be located at the top of the third subband or the bottom of the fourth subband. This can effectively control CLI interference while improving random access performance.

[0145] The transceiver unit can perform the receiving and sending processing in the aforementioned ninth aspect, and the processing unit can perform other processing in addition to receiving and sending in the aforementioned ninth aspect.

[0146] In a twentieth aspect, a first device is provided. The communication device has the functions of implementing the ninth aspect. For example, the communication device includes a module, unit, or means corresponding to performing the operations involved in the ninth aspect. The module, unit, or means can be implemented by software, hardware, or a combination of software and hardware.

[0147] In one possible design, the first device includes: a transceiver unit for receiving first information, the first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource and the first frequency domain resource corresponding to each other, the first part of the first time domain resource being located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, the second part of the first time domain resource being located in a second time domain unit, the second part being the time domain resource of the second resource, the second time domain unit being used only for uplink transmission, and the first information also indicating whether random access is performed on the first resource; a processing unit for randomly accessing or not randomly accessing the first resource according to the first information.

[0148] Exemplarily, the first information indicates not to perform random access on the second resource; or,

[0149] Exemplarily, when the second resource partially overlaps with the third resource, the first information indicates random access on the non-overlapping resource, the non-overlapping resource is a resource that does not overlap at all between the second resource and the third resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured; or,

[0150] Exemplarily, when the second resource and the third resource do not overlap, the first information indicates random access on the second resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

[0151] The transceiver unit can perform the reception and transmission processing in the aforementioned tenth aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned tenth aspect.

[0152] In a twenty-first aspect, a communication device is provided. The communication device may be the first device or the second device described above. The communication device includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transmit and receive signals. The memory is configured to store a computer program. The processor is configured to retrieve and execute the computer program from the memory, so that the communication device performs the method of any possible implementation of any of the first to tenth aspects described above.

[0153] Optionally, there are one or more processors and one or more memories.

[0154] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0155] Optionally, the communication device further includes a transmitter (transmitter) and a receiver (receiver).

[0156] In aspect 22, a communication system is provided. The communication system includes a first device and a second device, wherein the first device is configured to execute the method in any possible implementation of aspect 1, aspect 3 through aspect 7, aspect 9, or aspect 10, and the second device is configured to execute the method in any possible implementation of aspect 2 or aspect 8.

[0157] Exemplarily, the first device may be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program.

[0158] Exemplarily, the second device may be a network device, or a chip or circuit in the network device, or a CU or DU in the network device, or a functional module in the network device that can call and execute a program.

[0159] In a twenty-third aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer program code or instructions, and when the computer program code or instructions are executed, the method in any possible implementation manner of the first to tenth aspects is implemented.

[0160] In a twenty-fourth aspect, a chip is provided. The chip includes at least one processor coupled to a memory, the memory being configured to store a computer program, wherein when the computer program is executed, the method of any possible implementation of aspects 1 to 10 is implemented.

[0161] Illustratively, the chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0162] In a twenty-fifth aspect, a computer program product is provided, comprising computer program code or instructions, which, when executed, implements the method in any possible implementation manner of the first to tenth aspects.

[0163] In a twenty-sixth aspect, a computer program is provided, which, when executed, implements the method in any possible implementation manner of the first to tenth aspects.

[0164] It should be understood that the beneficial effects of the above-mentioned aspects 11 to 26 can be referred to the above-mentioned aspects 1 to 10 and any possible implementation method thereof, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0165] FIG1 is a schematic diagram of a communication system applicable to the present application;

[0166] FIG2 shows a schematic diagram of the time-frequency division of the SBFD scheme;

[0167] FIG3 shows a schematic diagram of the configuration of SBFD dedicated uplink and downlink time slots;

[0168] FIG4 shows a schematic flow chart of a four-step random access process;

[0169] FIG5 shows a schematic flow chart of a two-step random access process;

[0170] FIG6 shows a schematic diagram of configuring PRACH on a UL time slot;

[0171] FIG7 shows a schematic diagram of PRACH time-frequency resources;

[0172] FIG8 is a schematic diagram showing the association relationship between RO and SSB;

[0173] FIG9 is an interactive flow chart of a communication method provided in an embodiment of the present application;

[0174] FIG10 is a schematic diagram of PRACH resources on SBFD time slots and UL time slots provided in an embodiment of the present application;

[0175] FIG11 is an interactive flow chart of another communication method provided in an embodiment of the present application;

[0176] FIG12 is a schematic diagram of the positional relationship between the first resource and the RO provided in an embodiment of the present application;

[0177] FIG13 is a schematic diagram of random access resources for CBFA or CBRA provided in an embodiment of the present application;

[0178] FIG14 is an interactive flow chart of another communication method provided in an embodiment of the present application;

[0179] FIG15 is a schematic diagram of the positional relationship between measurement resources and PRACH resources provided in an embodiment of the present application;

[0180] FIG16 is a schematic diagram of the positional relationship of messages sent during the random access process provided by an embodiment of the present application;

[0181] FIG17 is a schematic diagram of the position of the first frequency point provided in an embodiment of the present application;

[0182] FIG18 is a schematic block diagram of a communication device provided in an embodiment of the present application;

[0183] Figure 19 is a schematic block diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0184] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0185] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR) and future communication systems, vehicle-to-other devices (V2X), where V2X may include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., long term evolution-vehicle (LTE-V), Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), etc. things, IoT), long term evolution-machine (LTE-M), machine to machine (M2M), etc.

[0186] Figure 1 is a schematic diagram of a communication system applicable to the present application. As shown in Figure 1 , communication system 100 includes at least one network device, such as network device 110 shown in Figure 1 ; communication system 100 may also include at least one terminal device, such as terminal device 120 and / or terminal device 130 shown in Figure 1 . Network device 110 and terminal device 120 or terminal device 130 can communicate via a wireless link, thereby exchanging information. It will be appreciated that network devices and terminal devices may also be referred to as communication devices or communication apparatuses.

[0187] A network device is a network-side device with wireless transceiver functions. A network device may be a device in a radio access network (RAN) that provides wireless communication functions for terminal devices, and is called a RAN device. The RAN may be a cellular system related to the 3rd Generation Partnership Project (3GPP), such as a 5G mobile communication system, or a future-oriented evolution system (such as a 6G mobile communication system). The RAN may also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. For example, the network device may be a base station, an evolved NodeB (eNodeB), a next-generation NodeB (gNB) in a 5G mobile communication system, a base station that has been subsequently evolved by 3GPP, a transmission reception point (TRP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. In communication systems using different radio access technologies (RATs), the names of devices with base station functions may be different. For example, in an LTE system, it may be referred to as an eNB or eNodeB, and in a 5G system or an NR system, it may be referred to as a gNB. This application does not limit the specific name of the base station. The network device may include one or more co-sited or non-co-sited transmitting and receiving points. For another example, the network device may include at least one of the following items: one or more centralized units (CU), one or more distributed units (DU), and one or more radio units (RU). In different systems, CU (or CU-CP and CU-UP), DU, or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, CU may also be referred to as O-CU (Open CU), DU may also be referred to as O-DU (Open DU), CU-CP may also be referred to as O-CU-CP, CU-UP may also be referred to as O-CU-UP, and RU may also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU, and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the functions of the CU may be implemented by one entity or different entities.For example, the functions of the CU are further divided, that is, the control plane and user plane are separated and implemented through different entities, namely the control plane CU entity (i.e., CU-CP entity) and the user plane CU entity (i.e., CU-UP entity). The CU-CP entity and CU-UP entity can be coupled with the DU to jointly complete the functions of the access network device. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer. In this way, some functions of the wireless access network device can be implemented through multiple network function entities. These network function entities can be network elements in hardware devices, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). The network device may also include an active antenna unit (AAU). The AAU implements some physical layer processing functions, RF processing, and related functions of the active antenna. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, therefore, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU, or, sent by DU+AAU. It can be understood that the network device can be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into a network device in the access network (radio access network, RAN), or the CU can be divided into a network device in the core network (core network, CN), and this application does not limit this. For example, in the vehicle to everything (V2X) technology, the access network device can be a road side unit (RSU). Multiple access network devices in the communication system can be base stations of the same type or different types. The base station can communicate with the terminal device, or it can communicate with the terminal device through a relay station. In the embodiments of the present application, the apparatus for implementing the network device function may be the network device itself, or may be an apparatus capable of supporting the network device in implementing the function, such as a chip system or a combination of devices or components capable of implementing the access network device function, which may be installed in the network device. In the embodiments of the present application, the chip system may be composed of a chip or may include a chip and other discrete components.

[0188] A terminal device is a user-side device with wireless transceiver capabilities. It can be a fixed device, mobile device, handheld device (such as a mobile phone), wearable device, in-vehicle device, or a wireless device built into any of the above devices (such as a communication module, modem, or chip system). Terminal devices are used to connect people, objects, and machines, and can be used in a wide range of scenarios, such as cellular communications, device-to-device (D2D) communications, vehicle-to-everything (V2X) communications, machine-to-machine / machine-type communications (M2M / MTC) communications, the Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical care, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, drones, robots, and other scenarios. Exemplarily, the terminal device can be a handheld terminal in cellular communication, a communication device in D2D, an Internet of Things device in MTC, a surveillance camera in intelligent transportation and smart cities, or a communication device on a drone, etc. The terminal device may sometimes be referred to as user equipment (UE), user terminal, user device, user unit, user station, terminal, access terminal, access station, UE station, remote station, mobile device or wireless communication device, etc. The terminal device may also be a terminal device in an IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection. In an embodiment of the present application, IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrowband (NB) technology. In an embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device, or a device that can support the terminal device to realize the function, such as a chip system or a combination device or component that can realize the function of the terminal device. The device can be installed in the terminal device.

[0189] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0190] For example, the communication system 100 may further include an application function (AF) network element, which is a control plane network function provided by the operator network and is used to provide application layer information; the communication system 100 may further include a session management function (SMF) network element, which is a control plane network function provided by the operator network. In the embodiment of the present application, when the communication system 100 includes the AF network element and the SMF network element, the AF can send service-related information to the network device via the SMF.

[0191] To facilitate understanding of the embodiments of the present application, the terms or technologies involved in the present application are first explained.

[0192] 1. TDD;

[0193] TDD divides time domain resources into uplink and downlink. For example, a possible TDD uplink / downlink configuration is DDDSU, where D represents a downlink timeslot, where every symbol is a downlink symbol; U represents an uplink timeslot, where every symbol is an uplink symbol; and S represents a special timeslot, which at least includes flexible symbols. Limited uplink time domain resource allocation leads to reduced uplink coverage and increased latency in TDD.

[0194] 2. SBFD;

[0195] In the SBFD scheme, a carrier is divided into multiple overlapping or non-overlapping subbands, and the transmission directions of different subbands can be different. That is, a carrier includes a non-overlapping first subband and a second subband, and the transmission directions of the first subband and the second subband are different. It should be noted that the first subband and the second subband refer to two types of subbands with different transmission directions, and do not mean that a carrier contains only two subbands. For example, a carrier includes subband #1 and subband #2, where the transmission directions of subband #1 and subband #2 are different. Alternatively, a carrier includes subband #1, subband #2, and subband #3, where the transmission directions of subband #1 and subband #3 are the same, and the transmission directions of subband #1 and subband #2 are different.

[0196] In this application, SBFD includes subband overlapping full duplex and subband non-overlapping full duplex.

[0197] 3. Sub-band;

[0198] A subband is a partial frequency band in a carrier, that is, one or more consecutive PRBs in the frequency domain. In this application, the subband used for uplink transmission is called an uplink subband, and the subband used for downlink transmission is called a downlink subband. A subband can also be understood as a frequency resource. Currently, the base station supports FD SBFD, that is, it can simultaneously transmit on the uplink subband and receive on the downlink subband in one time slot. The terminal device only supports half-duplex (HF) SBFD, that is, it can only transmit on the uplink subband or only receive on the downlink subband in one time slot.

[0199] 4. SBFD time unit;

[0200] The frequency resources on the SBFD time unit include uplink frequency resources and downlink frequency resources, wherein the uplink frequency resources are used for uplink transmission and the downlink frequency resources are used for downlink transmission. It can be understood that the SBFD time unit includes subbands for uplink transmission and downlink transmission, and the base station can use the subbands on the SBFD time unit to perform SBFD operation. In the embodiment of the present application, when the time unit is a symbol, the SBFD time unit is an SBFD symbol. When the time unit is a time slot, or a subframe, or a half-frame, or a frame, or a mini-subframe, or a mini-time slot, or a transmission occasion (TO), the SBFD time unit may refer to a time unit containing an SBFD symbol.

[0201] It should be noted that the frequency domain resources on the SBFD time unit of the present application may include downlink (DL) subbands and uplink (UL) subbands. In order to avoid cross-link interference between downlink transmission on the DL subband and uplink transmission on the UL subband, a guard band may be defined between the DL subband and the UL subband. The present application does not limit whether there is a guard band between the DL subband and the UL subband, and if the guard band exists, whether transmission can be performed on the guard band. In addition, the present application does not limit whether the DL subband and the UL subband can overlap.

[0202] 5. Non-SBFD time unit;

[0203] The frequency resource corresponding to each of all the symbols contained in the non-SBFD time unit is used only for downlink transmission or only for uplink transmission. In the embodiment of the present application, when the time unit is a symbol, the non-SBFD time unit is a non-SBFD symbol. When the time unit is a time slot, or a subframe, or a half frame, or a frame, or a mini-subframe, or a mini-time slot, or a TO, the non-SBFD time unit may refer to a time unit that does not contain an SBFD symbol. As an example, all the symbols in the non-SBFD time unit are downlink symbols, or all the symbols in the non-SBFD time unit are uplink symbols, or all the symbols in the non-SBFD time unit are flexible symbols, or part of the symbols in the non-full-duplex time unit are downlink symbols and part of the uplink symbols, or part of the symbols in the non-full-duplex time unit are downlink symbols, part of the uplink symbols and part of the flexible symbols, or part of the symbols in the non-full-duplex time unit are downlink symbols and part of the flexible symbols, or part of the symbols in the non-full-duplex time unit are uplink symbols and part of the flexible symbols. For example, the rectangular blocks filled with bars in FIG2 represent a set of time-frequency resources for uplink transmission. The time slots occupied by them in the time domain are called uplink time units. The transmission direction of all frequency resources on these time units is uplink. These time units can be called non-SBFD time units.

[0204] Figure 2 shows a schematic diagram of the time-frequency partitioning of the SBFD scheme. The horizontal axis represents the time domain, including SBFD time units, non-SBFD time units #1, and non-SBFD time units #2. The vertical axis represents the frequency domain, including the uplink BWP. In Figure 2, rectangles filled with left slashes represent time-frequency resources for downlink transmission, while rectangles filled with vertical bars represent time-frequency resources for uplink transmission. Frequency resources in SBFD time units include uplink and downlink subbands. Non-SBFD time unit #1 can be a downlink symbol or a flexible symbol, while non-SBFD time unit #2 can be an uplink symbol or a flexible symbol.

[0205] 6. SBFD dedicated uplink and downlink time slot configuration;

[0206] According to the different configurations of the uplink subband and downlink subband in a time slot, illustratively, the SBFD dedicated uplink and downlink time slot configurations may include the following three types: XXXXX, XXXXU and DXXXU, where D represents the downlink time unit, all symbols in the downlink time unit are downlink symbols, and the uplink subband cannot be configured on the downlink symbol; U represents the uplink time unit, all symbols in the uplink time unit are uplink symbols, and the downlink subband cannot be configured on the uplink symbol; X represents the SBFD time unit, and each symbol in the SBFD time unit can be configured with at least one uplink subband and at least one downlink subband at the same time.

[0207] It should be understood that the number of Xs in XXXXX, XXXXU, and DXXXU is only an example description, and the number of Xs can be configured by the network device according to actual conditions. In addition, XXXXX, XXXXU, and DXXXU can be configured through cell-level uplink and downlink time slot configuration signaling and UE-level uplink and downlink time slot configuration signaling.

[0208] Figure 3 shows a schematic diagram of the SBFD dedicated uplink and downlink time slot configuration. Figure 3 (a) is a possible example of XXXXX, Figure 3 (b) is a possible example of XXXXU, and Figure 3 (c) is a possible example of DXXXU. In this configuration method, the UE is invisible to the uplink and downlink subbands configured on the flexible symbols, that is, the UE does not know the frequency resource locations of the uplink and downlink subbands. Therefore, if the UE determines to perform downlink transmission on the flexible symbols, the base station should ensure that the UE is instructed to perform downlink reception only in the downlink subband configured with the flexible symbols. If the UE determines to perform uplink transmission on the flexible symbols, the base station should ensure that the UE is instructed to perform uplink transmission only in the uplink subband configured with the flexible symbols.

[0209] 7. Time and frequency resources;

[0210] In the embodiment of the present application, data or information may be carried by time-frequency resources, wherein the time-frequency resources may include resources in the time domain (i.e., time-domain resources) and resources in the frequency domain (i.e., frequency-domain resources).

[0211] In the time domain, the time domain resources may include one or more time domain units (or, may also be referred to as time units), and a time unit may include several time domain resources. A time domain unit is, for example, a radio frame (RF), and the time domain resources included in the time domain unit are, for example, a subframe, a frame, a half subframe or a half frame, a slot, a mini-slot, a partial slot, or an orthogonal frequency division multiplexing (OFDM) symbol, etc. Alternatively, a time domain unit may also be a collection of one or more time domain resources, for example, a time domain unit is one or more OFDM symbols in a time slot, for example, the number of the one or more is 6, 7, 12 or 14, etc. One or more time units may be continuous or discrete in time. In addition, the duration of a time slot may be related to a sub-carrier space (SCS) interval. For example, when the subcarrier spacing is 15kHz, the duration of a time slot is 1 millisecond (ms); when the subcarrier spacing is 30kHz, the duration of a time slot is 0.5ms; when the subcarrier spacing is 60kHz, the duration of a time slot is 0.25ms. Similarly, when the subcarrier spacing is 15*2 μ kHz, the length of a time slot is 2 -μ ms, μ = 0, 1, 2, .... μ is a non-negative integer.

[0212] In the frequency domain, frequency domain resources can include one or more frequency domain units. A frequency domain unit can be an RE, a resource block (RB), a subchannel, a resource pool, a bandwidth, a bandwidth part (BWP), a component carrier (CC), a channel, or an interlace RB, etc.

[0213] 8. Random access;

[0214] Terminal devices use random access procedures to acquire uplink synchronization and access the network for communication. Random access includes contention-based random access (CBRA) (also known as four-step random access) and non-contention-based random access (CFRA) (also known as two-step random access). Non-contention-based access is typically used when the terminal device has successfully received radio resource control (RRC) signaling.

[0215] The random access process refers to the process from the time the terminal device sends a random access preamble (preamble) to try to access the network to the time the basic signaling connection is established with the network. It should be noted that before the terminal device selects the RO to send the preamble, the terminal device needs to select an uplink carrier. For example, when the supplementary uplink (SUL) or normal uplink (NUL) is configured, the terminal device can choose to work on SUL or NUL. After selecting the uplink carrier, the terminal device (such as a terminal device in an RRC connected state) may need to perform a bandwidth partial BWP operation. For example, when the RO is not configured on the activated uplink BWP of the terminal device, the terminal device needs to switch the activated uplink BWP to the initial uplink BWP. After selecting the uplink carrier or BWP operation, the terminal device needs to select the random access (RA) type, which can be understood as the terminal device needs to choose whether to perform two-step random access or four-step random access. Furthermore, after determining the RA type, the terminal device needs to select RACH resources: the terminal device can select the RO based on the selected synchronization signal block (SSB) and the mapping relationship between the SSB and the RO. For example, one SSB can correspond to multiple ROs, or multiple SSBs can be mapped to one RO; for another example, one SSB corresponds to one or more preambles, and different SSBs can use different preambles.

[0216] Figure 4 shows a schematic flow chart of a contention-based random access method. The execution subjects of the method shown in Figure 4 can be a first device and a second device, wherein the first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program, and the second device can be a network device, or a chip or circuit in the network device, or a CU or DU in the network device, or a functional module in the network device that can call and execute a program. As shown in Figure 4, the method includes the following steps.

[0217] S410: The first device sends a random access preamble to the second device.

[0218] Accordingly, the second device receives the random access preamble code sent by the first device.

[0219] Exemplarily, the first device sends a preamble, namely Msg1, to the second device on the PRACH resource. It should be understood that before step S410, the first device can obtain the resource configuration for sending the PRACH by reading the system information block (SIB), which mainly includes configuration information such as the time-frequency resource location, the mapping relationship between SSB and RO, and the mapping relationship between preamble and SSB.

[0220] S420: The second device sends the RAR to the first device.

[0221] Accordingly, the first device receives the RAR from the second device.

[0222] Exemplarily, the second device sends a RAR, namely Msg2, to the first device based on the preamble. The RAR may include indication information indicating the uplink resources for sending message 3 (Msg3). It can be understood that after the first device receives the RAR, it can know the uplink resources for sending Msg3.

[0223] It should be understood that before executing step S420, or in other words, after sending Msg1, the first device initiates a random access response window and monitors the RAR sent by the second device within the window. If the first device successfully detects its own RAR, random access is successful, and the first device can continue to send Msg3 according to the RAR instruction, that is, execute step S430. If the UE does not receive its own RAR, random access fails, and the first device re-initiates the random access process according to the fallback parameters indicated by the second device until the maximum number of random access attempts is reached.

[0224] S430: The first device sends Msg3 to the second device.

[0225] Accordingly, the second device receives Msg3 from the first device.

[0226] Exemplarily, the first device sends Msg3 based on the RAR. The main function of Msg3 is to send an RRC connection establishment request. Msg3 may include layer 2 (L2) information and / or layer 3 (L3) information, such as an RRC connection establishment request message; and also, for example, a beam failure recovery (BFR) MAC control element (CE).

[0227] S440: The second device sends a contention resolution message to the first device.

[0228] Accordingly, the first device receives a contention resolution message from the second device.

[0229] The contention resolution message includes an identifier (ID) of the first device. Optionally, the contention resolution message may also be referred to as message 4 (Msg4), which carries the contention resolution identifier and air interface parameter configuration for the first device.

[0230] For example, if the first device successfully resolves contention, the second device sends a contention resolution message to the first device. If the first device successfully receives Msg4, and Msg4 carries its own contention resolution identifier, random access is successful; otherwise, random access fails. If successful, the first device can continue to send Msg5, the main function of which is to send an RRC establishment complete command. If unsuccessful, the first device re-initiates the random access process according to the fallback parameters indicated by the second device until the maximum number of random access attempts is reached.

[0231] Optionally, in response to the physical downlink share channel (PDSCH) carrying Msg4, the first device may send corresponding hybrid automatic retransmission quest-acknowledgement (HARQ-ACK) information through the physical uplink control channel (PUCCH).

[0232] Furthermore, when the second device determines from Msg3 that the random access is contention-based random access, it saves information of first devices that need to contend, and when resolving contention through Msg4, it performs contention resolution on these contending first devices.

[0233] It should be noted that FIG4 is only a schematic diagram provided for the convenience of explaining the four-step random access process and does not constitute any limitation on the protection scope of this application. For a specific description of the four-step random access process, reference can be made to the introduction in the current related art.

[0234] Figure 5 shows a schematic flow chart of a two-step random access process. The execution subject of the method shown in Figure 5 can be a first device and a second device, wherein the first device can be a terminal device, or a chip or circuit in the terminal device, or a functional module in the terminal device that can call and execute a program, and the second device can be a network device, or a chip or circuit in the network device, or a CU or DU in the network device, or a functional module in the network device that can call and execute a program. As shown in Figure 5, the method includes the following steps.

[0235] S510: The first device sends a message A (MsgA) to the second device.

[0236] Accordingly, the second device receives message A from the first device.

[0237] The MsgA includes a preamble part and a PUSCH part. The preamble part is sent on a PRACH resource (such as the RO mentioned above), and the PUSCH resource can carry L2 or L3 information, such as a BFR MAC CE or an RRC connection establishment request message.

[0238] S520: The second device sends a message B (MsgB) to the first device.

[0239] Accordingly, the first device receives message B from the second device.

[0240] The MsgB message may include a success RAR (success RAR) or a fallback RAR (fallback RAR).

[0241] Exemplarily, when the first device receives the fallback RAR, the first device needs to fall back to the four-step random access process and send Msg3 to the second device, that is, execute step S430 of FIG. 4 above.

[0242] Optionally, in addition to the above-mentioned fallback process from two-step random access to four-step random access, if the second device chooses to perform a two-step random access process when triggering random access, after the preamble of the two-step random access process reaches the maximum number of transmissions, the first device can also fallback to the four-step random access process to attempt access, thereby increasing the access success rate of the first device and ensuring the access performance of the first device.

[0243] As mentioned above, the UE sends a preamble sequence on the RO. An RO can be considered as a time-frequency resource for transmitting the preamble. An RO can support code division multiplexing transmission of multiple preamble sequences, and an NR cell supports multiple ROs. Unlike LTE, NR introduces multi-beam operation, so the random access process of NR is based on beam transmission. For example, for UEs in the initial access phase, its transmission is mainly based on the SSB beam. For UEs in the connected state, it can also be based on the CSI-RS beam. NR can support the base station to send SSBs in multiple beam directions. For example, in frequency range 1 (FR1), it can support up to 8 SSBs. The UE can select one of the SSBs and use this SSB beam to send the PRACH. Regarding how the UE selects the SSB to send the PRACH, for example, if the base station does not configure the reference signal received power RSRP threshold, the UE can select any SSB to send the PRACH. Otherwise, it can select any SSB from the SSB(s) that exceed the RSRP threshold to send the PRACH.

[0244] Figure 6 shows a schematic diagram of configuring PRACH on a UL time slot. As shown in Figure 6, the horizontal axis represents the time domain, including the SBFD time slot and the UL time slot, the vertical axis represents the frequency domain, and the dotted box in the UL time slot can represent the PRACH resource. For example, the base station can configure PRACH in the UL time slot by sending a RACH-ConfigGeneric information element, and the UE can use the PRACH for random access. For example, the UE obtains the period, frame number, subframe number, time slot number, number of ROs in the time slot, etc. of the PRACH in the time domain according to the parameter prach-ConfigurationIndex carried in the RACH-ConfigGeneric, thereby determining the time domain position of the PRACH. For another example, the UE can obtain the starting position and frequency division multiplexing number of the PRACH in the frequency domain according to the parameters msg1-FrequencyStart and msg1-FDM carried in the RACH-ConfigGeneric, respectively, thereby determining the frequency domain position of the PRACH.

[0245] FIG7 shows a schematic diagram of the time-frequency resources of PRACH. As shown in FIG7( a ), the three topmost blocks in the figure may represent the radio frame where the PRACH is located, and the time domain distance between two adjacent blocks is the PRACH period. The middle layer represents the 10 subframes contained in a radio frame where the PRACH is located, for example, subframes 0-9, where subframes 4 and subframe 9 represent the subframes where the PRACH is located. The bottom layer represents the time slot structure of subframe 4 where the PRACH is located, and the time slot structure includes two PRACH slots (for example, PRACH slot#1 and PRACH slot#2). Each small block is one RO, that is, each PRACH slot contains six ROs. As shown in FIG7( b ), the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. Each block represents one RO, and the number of ROs may be 1, 2, 4, or 8. For example, four ROs may be arranged starting from the frequency domain position specified by msg1-FrequencyStart.

[0246] It should be understood that during the Msg1 transmission process of step S410 above, the UE can select an RO to transmit the Preamble sequence based on the index of the SSB. Therefore, in the NR standard, in addition to specifying the PRACH position, the RO-SSB mapping relationship is also specified (one SSB index can be associated with multiple ROs, or multiple SSB indexes are associated with one RO). For example, the network device can configure the mapping relationship of N SSBs to 1 RO through the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB. When N is less than 1, 1 SSB is associated with 1 / N ROs; when N is greater than 1, N SSBs are associated with 1 RO (1 SSB is associated with 1 / N ROs).

[0247] Figure 8 shows a schematic diagram of the association relationship between RO and SSB. As shown in Figure 8 (a), when N=1 / 2, one SSB is associated with 2 ROs. As shown in Figure 8 (b), when N=2, one RO is associated with 2 SSBs. Therefore, when one SSB index is associated with multiple ROs, the UE can select one of the multiple ROs and select the preamble sequence to be transmitted on the RO. Furthermore, after determining the association relationship between RO and SSB, the UE starts RO-SSB mapping in the order of frequency domain first, then time domain, first same time slot, then same frame, and finally different frames. As shown in Figure 8 (c), where the horizontal axis represents the time domain and the vertical axis represents the frequency domain, the SSB set used by the base station can be {SSB i , SSB i+1 , SSB i+2 , SSB i+3}, msg1-FDM=4 and N=1 / 4, 1 SSB is associated with 4 ROs, and the RO set is recorded as {RO0, RO1, RO2, RO3}. 16 ROs complete a complete RO-SSB mapping cycle. The mapping order of RO-SSB can be arranged from the frequency domain corresponding to a certain RO time domain position, that is, SSB i The corresponding RO0-RO3 occupies the first RO time domain position of the PRACH time slot at the beginning of the same frame, corresponding to the four RO positions in the frequency domain, SSB i+1 The corresponding RO0-RO3 occupies the second RO time domain position of the starting PRACH time slot, corresponding to the 4 RO positions in the frequency domain, SSB i+1 The corresponding RO0-RO3 occupies the second RO time domain position of the PRACH time slot at the beginning of the same frame, corresponding to the four RO positions in the frequency domain, SSB i+2 The corresponding RO0-RO3 occupies the first RO time domain position of the second PRACH time slot of the same frame, corresponding to the four RO positions in the frequency domain, SSB i+3 The corresponding RO0-RO3 occupy the second RO time domain position of the second PRACH time slot of the same frame, corresponding to the four RO positions in the frequency domain.

[0248] Currently, random access is supported on SBFD symbols / timeslots, including the transmission of Msg1 or MsgA. However, the following issues may arise when supporting the transmission of Msg1 or MsgA on SBFD symbols / timeslots:

[0249] (1) Uplink transmission in the uplink subband of an SBFD symbol / time slot will generate cross-link interference (CLI) on downlink transmission in the downlink subband of the current cell or neighboring cells, i.e., UE-UE interference. This results in poor downlink transmission performance in the SBFD symbol / time slot, especially for users in poor coverage areas such as the cell edge. To ensure the success rate of random access, users increase their transmit power, which leads to stronger UE-UE interference.

[0250] (2) Uplink transmissions in the uplink subband of SBFD symbols / timeslots are affected by CLI (CLI) caused by downlink transmissions in the downlink subband of the same cell or neighboring cells, resulting in poor uplink transmission performance in SBFD symbols / timeslots. Supporting PRACH transmission in SBFD symbols / timeslots can lead to problems such as a decrease in UE random access success rate, especially for users in poor coverage areas such as the cell edge, where the random access success rate is significantly reduced.

[0251] It is important to note that the base station can effectively control the UE-UE interference caused by connected UEs but cannot control the UE-UE interference caused by idle UEs. The degree of UE-UE interference caused by idle UEs varies in different situations, depending on the PRACH resource location, the number of accessed users, user density, application scenarios, etc. In different situations, the losses and benefits of initial access of idle UEs to PRACH resources in SBFD time slots (hereinafter referred to as SBFD-PRACH resources) vary.

[0252] In summary, during random access in SBFD symbols / timeslots, uplink and downlink transmissions interfere with each other, impacting transmission performance. Furthermore, random access performance varies depending on different circumstances (e.g., PRACH resource location, number of accessing users, user density, and application scenarios). Addressing the performance degradation caused by Msg1 or MsgA transmissions during random access in SBFD time slots / symbols, or enabling base stations to flexibly control SBFD-PRACH resources for initial access, remains a challenge.

[0253] In order to solve the above technical problems, the present application provides a communication method and a communication device, which can effectively improve random access performance.

[0254] The communication method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The embodiment provided in the present application can be applied to the communication system shown in Figure 1 above. The technical solution of the present application will be specifically described in conjunction with Figure 9. The execution subject can be a first device or a second device, wherein the first device can be a terminal device, or a communication module in the terminal device, or a circuit or chip responsible for the communication function in the terminal device (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip), or a logical node, logical module or software that can implement all or part of the functions of the access network device, and the second device can be a network device, or a CU or distributed unit DU in the network device, or a module in the network device (such as a circuit, chip or chip system, etc.), or a logical node, logical module or software that can implement all or part of the functions of the access network device.

[0255] FIG9 is a flow chart of a communication method provided by an embodiment of the present application. As shown in FIG9 , the method 900 includes the following steps.

[0256] S910: The second device sends first information to the first device.

[0257] Accordingly, the first device receives the first information from the second device.

[0258] The first information indicates a first resource, and the first information further indicates whether random access is performed on the first resource.

[0259] Exemplarily, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first part of the first time domain resource is located in a first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first frequency domain unit.

[0260] It should be understood that the first resource may be referred to as a random access resource (eg, a PRACH resource) and is used for random access.

[0261] Exemplarily, the first device may be an inactive UE, an idle UE, or a connected UE, and this application does not limit the active state or the connected state of the first device. Optionally, the first device is a terminal supporting sub-band duplexing.

[0262] Exemplarily, the first time domain unit may be an SBFD time domain unit (e.g., an SBFD time slot or an SBFD symbol), or a single frequency full duplex (SFFD) time unit, and the first frequency domain unit may be a component carrier (CC). As shown in FIG10(a), the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit) and the UL time slot (i.e., the second time domain unit, which may also be referred to as the UL time domain unit), and the vertical axis represents the frequency domain, including the first subband and the second subband (i.e., the first frequency domain unit), wherein the first uplink subband may be referred to as an uplink subband and the second may be referred to as a downlink subband. The first resource may be a resource located in the SBFD time slot, i.e., the dotted box in the SBFD time slot may represent a PRACH resource.

[0263] Optionally, the second subband includes a third subband and a fourth subband, and the third subband and the fourth subband are located on both sides of the first subband in the time domain. As shown in Figure 10(a), the third subband can be considered to be located above the first subband, and the fourth subband can be considered to be located below the first subband, that is, the third subband and the fourth subband are both downlink subbands.

[0264] Optionally, the first information may be a broadcast message or a message specifically sent to the first device, which is not limited in this application.

[0265] For example, the first information may include two fields, such as a first field and a second field. The first field may be a PRACH-configuration-index, which is used to indicate the first resource. The second field may be a newly added field, which is used to indicate whether random access is performed on the first resource. The second field may be represented by a bit, where bit "1" indicates random access on the first resource, and bit "0" indicates not random access on the first resource, or not random access on the first resource, or vice versa. For another example, the value of the second field is enable, which indicates that an idle UE or an inactive UE can randomly access the first resource, and the value of the second field is disable, which indicates that an idle UE or an inactive UE cannot randomly access the first resource. For another example, the first information may include a bitmap, in which the bit position corresponding to the indication of random access on the first resource may have a value of "1", and the bit position corresponding to the indication of not random access on the first resource may have a value of "0", or vice versa.

[0266] In one implementation, the first information includes second information and third information, the second information indicates the first resource, and the third information indicates whether random access is performed on the first resource.

[0267] For example, the second information may include a first field, and the third information may include a second field. The first field and the second field may be represented by bits, where the value of the first field may be "1" to indicate the time-frequency position of the first resource, the value of the second field may be "1" to indicate random access on the first resource, and the value of the second field may be "0" to indicate no random access on the first resource.

[0268] S920: The first device randomly accesses or does not randomly access the first resource according to the first information.

[0269] It should be understood that if the first information in step S910 indicates random access on the first resource, the first device randomly accesses the first resource; or, if the first information in step S910 indicates not random access on the first resource, the first device does not randomly access the first resource.

[0270] Exemplarily, after receiving the first information, the first device parses the first information and determines the time-frequency domain position of the first resource, such as the dotted box shown in Figure 10, and parses the first information and determines whether the first resource can be used for random access, that is, determines whether a random preamble code is sent on the first resource, that is, whether message 1 or message A is sent on the first resource.

[0271] In one implementation, when the first information indicates random access on a first resource and the first device is in an idle state or an inactive state, the first device performs random access on the first resource. Taking the first device as a UE as an example, since the second device (e.g., a base station) cannot control UE-UE interference caused by idle or inactive UEs, the base station can instruct the idle or inactive UE via the first information whether to perform CBRA on the first resource, thereby minimizing transmission interference and ensuring random access performance.

[0272] In one implementation, when the first information indicates random access on the first resource and the first device is in a non-idle state or a connected state, the first device may perform random access on the first resource. Taking the first device as a UE as an example, since the second device (e.g., a base station) can better control UE-UE interference caused by a connected UE, the base station can instruct the non-idle UE or the connected UE to perform random access on the first resource through the first information, such as CBRA or CFRA, to minimize transmission interference and ensure random access performance.

[0273] In one implementation, when the first information indicates random access on the first resource and the first device is in a non-idle state, the first device does not perform random access on the first resource. Taking the first device as a UE as an example, since the second device (e.g., a base station) can better control UE-UE interference caused by connected UEs, the base station can instruct the non-idle UE not to perform random access on the first resource through the first information, thereby minimizing transmission interference and ensuring random access performance.

[0274] In one implementation, when the first information indicates random access on a first resource and the first device is in a non-idle state, the first device does not perform CBRA on the first resource but may perform CFRA. Taking the first device as a UE as an example, since the second device (e.g., a base station) can better control UE-UE interference caused by connected UEs, the base station can instruct the non-idle UE through the first information not to perform CBRA on the first resource, thereby minimizing transmission interference and ensuring random access performance.

[0275] In one implementation, when the first information indicates not to perform random access on the first resource, and / or the first device is in a non-idle state or an active state, the first device does not perform random access on the first resource.

[0276] It should be understood that in the embodiment of the present application, the first time domain resource may include a first part and other parts (such as a second part or a third part, etc.), where the first part of the first time domain resource is located in the first time domain resource, and the other parts of the first time domain resource other than the first part (such as the second part or the third part, etc.) may be located in the first time domain unit, or may also be located in other time domain units, such as the second time domain unit, etc. For example, the first part, the second part, and the third part of the first time domain resource may be located in the SBFD time domain unit, the SBFD time domain unit, and the UL time domain unit in sequence, or the first part, the second part, and the third part of the first time domain resource may be located in the SBFD time domain unit, the UL time domain unit, and the UL time domain unit in sequence, or the first part, the second part, the third part, and the fourth part of the first time domain resource may be located in the SBFD time domain unit, the SBFD time domain unit, the UL time domain unit, and the UL time domain unit in sequence, etc., and this application is not limited to this.

[0277] In one implementation, the second portion of the first time domain resource is located in a second time domain unit, and the second portion is a time domain resource of the second resource, wherein the second time domain unit is used only for uplink transmission. In this case, in conjunction with Figures 10(b) and (c), the resources used by the first apparatus for random access include one or more of the following:

[0278] (1) The first information indicates that random access is not performed on the second resource, or in other words, the second resource is an invalid resource and cannot be used for random access. It should be understood that this method is applicable to terminals that support SBFD or SFFD. For example, the first information may be prach-ConfigurationIndex, which is used to indicate time domain location information such as the period, frame number, subframe number, time slot number, and number of ROs in the time slot of the first resource and the second resource in the time domain. For ease of distinction, the first information here may be the first prach-ConfigurationIndex, and the time domain location information of the PRACH resource on the UL time domain unit shown in FIG6 may be indicated by the second prach-ConfigurationIndex.

[0279] As shown in (b) of Figure 10, the first part of the first time domain resource is located on the SBFD time slot, that is, the first resource is located on the SBFD time slot, and the second part of the first time domain resource is located on the UL time slot, that is, the second resource is located on the UL time slot. At this time, the second device can indicate not to randomly access the second part by sending the first information, that is, the first device cannot randomly access the second resource on the UL time slot, that is, the RO included in the second resource can be regarded as an invalid RO, which means that the first device cannot use the invalid RO to send a random access preamble (preamble), and the second device does not need to receive and detect the preamble.

[0280] (2) When the second resource and the third resource partially overlap, the first information indicates random access on non-overlapping resources. The non-overlapping resources are resources that do not overlap at all between the second resource and the third resource. In other words, the overlapping resources between the second resource and the third resource cannot be used for random access. The overlapping resources can be regarded as invalid resources, and the RO included in the overlapping resources can be regarded as an invalid RO. The time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured. It should be understood that the method for determining the third resource can refer to the PRACH resource shown in Figure 6 above.

[0281] As shown in (c) of Figure 10, the first part of the first time domain resource is located on the SBFD time slot, that is, the first resource is located on the SBFD time slot, and the second part of the first time domain resource is located on the UL time slot, that is, the second resource is located on the UL time slot, wherein the second resource and the third resource are partially overlapped. At this time, the second device can indicate random access to the non-overlapping part of the second resource and the third resource by sending the first information, or in other words, the first information indicates random access to the non-overlapping part of the second resource and the third resource on the UL time slot.

[0282] (3) When the second resource and the third resource do not overlap, the first information indicates random access on the second resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

[0283] As shown in FIG10( b ), the first portion of the first time domain resource is located in the SBFD time slot, that is, the first resource is located in the SBFD time slot, and the second portion of the first time domain resource is located in the UL time slot, that is, the second resource is located in the UL time slot. The two do not overlap. In this case, the second device can randomly access the second portion by sending the first information instruction. In other words, the first device can randomly access the second resource in the UL time slot. Optionally, the first device can also randomly access the first resource in the SBFD time slot, which is not limited in this application.

[0284] In this application, the first resource and the second resource configured by the first prach-ConfigurationIndex, and the third resource configured by the second prach-ConfigurationIndex, may satisfy one or more of the following:

[0285] (1) The format length of the random access preamble sent on the first resource and the second resource is greater than the format length of the random access preamble sent on the third resource; the first PRACH-ConfigurationIndex indicates the format length of the random access preamble sent on the first resource and the second resource and the time domain position of the first resource, and the second PRACH-configuration-index signaling indicates the format length of the random access preamble sent on the third resource and the time domain position of the third resource, wherein the PRACH-configuration-index signaling is carried in the SIB signaling

[0286] (2) The first resource and the second resource support repeated transmission of the physical random access channel (PRACH), while the third resource does not support repeated transmission of the PRACH, or the maximum number of repeated transmissions supported by the first resource is different from the maximum number of repeated transmissions supported by the second resource;

[0287] (3) the corresponding RSRP thresholds of the first resource and the second resource used to determine the number of repetitions (e.g., 2, 4, 8, or other values) are greater than the corresponding RSRP threshold of the third resource used to determine the number of repetitions (e.g., 2, 4, 8, or other values);

[0288] For example, the threshold #1 for judging whether the first resource and the second resource are not repeated or are repeated twice is greater than the threshold #2 for judging whether the third resource is not repeated or is repeated twice, or the threshold #3 for judging whether the first resource and the second resource are repeated twice or are repeated four times is greater than the threshold #4 for judging whether the third resource is repeated twice or is repeated four times, and so on.

[0289] (4) The time domain resource corresponding to the RO in the first resource and the second resource is greater than the time domain resource corresponding to the RO in the third resource, or the preamble length corresponding to the first resource and the second resource is greater than the preamble length corresponding to the third resource;

[0290] (5) The maximum power allowed for the UE to transmit PRACH on the first resource and the second resource is less than the maximum power allowed for the UE to transmit PRACH on the third resource, where the maximum transmit power can be understood as the maximum transmit power configured by the base station for the first device (e.g., UE) to transmit RPACH. For example, the base station directly indicates a power value, which represents the maximum PRACH power or represents a fallback value of the maximum transmit power configured by the base station for the first device (e.g., UE) to transmit uplink data;

[0291] (6) During a random access process, the power of the first device in sending the PRACH on the first resource and the second resource is less than the power of sending the PRACH on the third resource.

[0292] In one possible implementation, when the first information indicates random access on the first resource, the first device may determine a first RO from the first resource and then send a random access preamble on the first RO. Optionally, the first information may also indicate that the first RO is used for contention-based random access (CBRA); or the first information may also indicate that the first RO is used for contention-free random access (CFRA). The implementation of determining the first RO from the first resource may refer to prior art or the relevant description below, and is not limited in this application.

[0293] Based on the above scheme, the second device (such as a base station) sends a first information to the first device (such as a terminal) to indicate whether the first resource can be used for initial access by idle or inactive terminals based on the CLI interference situation of the cell evaluated by itself. This can effectively control the UE-UE interference level caused by random access of idle or inactive terminals in the cell, achieve a compromise between enhanced terminal access capability and interference control, improve random access performance, and reduce transmission interference.

[0294] FIG11 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG11 , the method 1100 includes the following steps.

[0295] S1110, the second device sends first information to the first device.

[0296] Accordingly, the first device receives the first information from the second device.

[0297] Among them, the first information indicates the first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first time domain resource is located in the first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first frequency domain unit.

[0298] It should be understood that for the first information and the first resource, reference may be made to the relevant description of the above method 900 and will not be further explained here.

[0299] S1120: The first device obtains second information, and determines a first RO according to the first information and the second information.

[0300] The second information indicates a first threshold, and the first threshold includes one or more of the following: an RSRP threshold, a path loss threshold, a transmit power threshold, or a frequency distance threshold.

[0301] It can be understood that RSRP refers to the power value of the reference signal received at the receiving end, which can represent signal strength or signal quality. Path loss refers to the attenuation of signal strength caused by various factors during signal transmission. For example, path loss represents the difference between transmit power and receive power. Transmit power can refer to the output power or transmit power of the signal. One implementation method is that the base station broadcasts the transmit power of the reference signal to the UE, and the UE calculates the RSRP using the measured received reference signal power and the transmit power of the reference signal broadcast by the base station. The frequency distance can refer to the frequency distance between the PRACH resource in the uplink subband and the downlink subband, or it can refer to the frequency distance between the PRACH resource in the uplink subband and the predefined frequency point. The predefined frequency point can be located in the uplink subband, or it can be located in the downlink subband. This application does not limit this. In other words, the first RO should be the RO as far away from the downlink subband as possible, which can effectively reduce CLI interference and improve random access performance.

[0302] In the first example, the second information can be predefined or preconfigured, where predefinition can include predefinition, such as protocol definition, and preconfiguration can be achieved by pre-saving corresponding codes, tables, functions, texts, strings or other methods that can be used to indicate the second information in the first device. This application does not limit its specific implementation method.

[0303] In a second example, the second information may be configured through signaling. For example, the second device sends the second information to the first device, and correspondingly, the first device receives the second information from the second device and parses the second information to obtain the first threshold.

[0304] Next, a specific implementation manner in which the first device determines the first RO according to the first information and the second information is described.

[0305] In a first implementation manner, the first device obtains a first measurement result, determines a first comparison result according to the first measurement result and a first threshold, and determines a first RO according to the first comparison result and a first mapping relationship.

[0306] Among them, the first mapping relationship indicates a mapping relationship between M comparison results and N RO sets, the M comparison results include the first comparison result, the first resource includes N RO sets, the N RO sets include the first RO set, the first RO set includes the first RO, and M and N are both integers greater than or equal to 1.

[0307] Optionally, the first measurement result obtained by the first device may be a measurement result obtained by the first device measuring a signal (such as an SSB beam), or may be a measurement result received from other third-party devices, such as a measurement result obtained by a third-party device measuring a signal.

[0308] In one example, the first mapping relationship can be predefined or preconfigured, where predefinition can include predefinition, such as protocol definition, and preconfiguration can be achieved by pre-saving corresponding codes, tables, functions, texts, strings or other methods that can be used to indicate the first mapping relationship in the first device. This application does not limit its specific implementation method.

[0309] In another example, the first mapping relationship may be configured through signaling. For example, the second device sends the first mapping relationship to the first device, and correspondingly, the first device receives the first mapping relationship from the second device.

[0310] In this implementation, the first threshold includes an RSRP threshold, a path loss threshold, or a transmit power threshold as an example for illustration.

[0311] It should be noted that in this application, when comparing A and B, the description of "when A is greater than or equal to B, execute method A, when A is less than or equal to B, execute method B" can be specifically implemented as "when A is greater than or equal to B, execute method A; or, when A is less than B, execute method B", or "when A is greater than B, execute method A; or, when A is less than or equal to B, execute method B", and this application does not limit this. For the sake of convenience of description, the implementation methods provided in this application are all explained using "when A is greater than or equal to B, execute method A; or, when A is less than B, execute method B" as an example.

[0312] The first mapping relationship is exemplified in table form below. If the first threshold is an RSRP threshold, the first mapping relationship refers to a mapping relationship between an RSRP measurement value and an RO set as shown in Table 1. For example, the first device compares the RSRP measurement value of an SSB or other reference signal with the RSRP threshold, determines the RO resource location for random access based on the comparison result, and also determines the SSB beam used for random access based on the correspondence between the SSB and the RO.

[0313] Table 1

[0314] As shown in Table 1, the comparison results include comparison result #1, comparison result #2, comparison result #3, and comparison result #4, and the RO sets include RO set #1 and RO set #2. A row in Table 1 represents a mapping relationship between a comparison result and its corresponding RO set.

[0315] For example, the RO sets corresponding to comparison results #1 and #2 can be seen in Figure 12(a). The frequency domain includes two downlink subbands and one uplink subband. The large dashed box in the SBFD time slot represents the first resource, and the small dashed box in the first resource represents one RO. The frequency distance between RO set #1 and the downlink subband is greater than the frequency distance between RO set #2 and the downlink subband. That is, RO set #1 includes 10 small dashed boxes in the upper and lower rows, i.e., 10 ROs, and RO set #2 includes 10 small dashed boxes in the middle two rows, i.e., 10 ROs. If the RSRP value measured by the first device for the SSB beam is greater than or equal to RSRP threshold #1, RO set #1 can be determined according to the first mapping relationship in Table 1, and the first device can select an RO from the ROs in the upper and lower rows of the figure as the first RO. Alternatively, if the RSRP value measured by the first device for the SSB beam is less than RSRP threshold #1, RO set #2 can be determined according to the first mapping relationship in Table 1, and the first device can select an RO from the ROs in the middle two rows of the figure as the first RO.

[0316] For example, the RO sets corresponding to comparison results #3 and #4 can be seen in Figure 12(b). The frequency domain includes one downlink subband and one uplink subband. The large dashed box in the SBFD time slot represents the first resource, and the small dashed box in the first resource represents one RO. The frequency distance between RO set #1 and the downlink subband is less than the frequency distance between RO set #2 and the downlink subband. That is, RO set #1 includes the 10 small dashed boxes in the bottom two rows, i.e., 10 ROs, and RO set #2 includes the 10 small dashed boxes in the top two rows, i.e., 10 ROs. If the RSRP value measured by the first device for the SSB beam is greater than or equal to RSRP threshold #1, RO set #1 and RO set #2 can be determined according to the first mapping relationship in Table 1, and the first device can select an RO from all ROs in the figure as the first RO. Alternatively, if the RSRP value measured by the first device for the SSB beam is less than RSRP threshold #1, RO set #2 can be determined according to the first mapping relationship in Table 1, and the first device can select an RO from the ROs in the middle two rows in the figure as the first RO.

[0317] For example, the RO sets corresponding to comparison results #5 to #12 can be seen in (c) of Figure 12. The frequency domain includes one downlink subband and one uplink subband. The large dashed box on the SBFD time slot represents the first resource, and the small dashed box in the first resource represents one RO. The frequency distances between RO set #1, RO set #2, RO set #3, and RO set #4 and the downlink subband gradually increase. That is, RO set #1 includes the five small dashed boxes in the bottom row, RO set #2 includes the five small dashed boxes in the second-to-last row, RO set #3 includes the five small dashed boxes in the second row, and RO set #4 includes the five small dashed boxes in the first row. That is, each RO set includes five ROs. If the first device measures the SSB beam, If the RSRP measurement value is greater than or equal to RSRP threshold #2 and less than RSRP threshold #1, RO set #2 can be determined according to the first mapping relationship in Table 1, and then the first device can select an RO from the ROs in the third row of the figure as the first RO; alternatively, if the RSRP measurement value of the SSB beam measured by the first device is greater than or equal to RSRP threshold #3 and less than RSRP threshold #2, RO set #3 and RO set #4 can be determined according to the first mapping relationship in Table 1, and then the first device can select an RO from the ROs in the upper two rows of the figure as the first RO.

[0318] Optionally, as shown in FIG12( c ), RO set #1 and RO set #2 may be frequency division multiplexed RO sets with different frequency indices, where RO set #1 is closer to the downlink subband than RO set #2 (the frequency distance between the two is smaller).

[0319] Optionally, if there is no RO that meets the above requirements, the first device will not use the first resource for initial random access.

[0320] It should be noted that a small RSRP measurement value indicates poor signal quality, and the corresponding UE may cause strong interference. In this case, an RO with a frequency farther away from the downlink sub-band can be used. A large RSRP measurement value indicates good signal quality, and the corresponding UE is more likely to cause weak interference. In this case, an RO closer to the downlink sub-band can be used, or an RO random access can be arbitrarily selected to reduce the interference of PRACH transmission with high PRACH transmit power on the downlink UE in the SBFD time slot.

[0321] The first mapping relationship is exemplified in table form below. If the first threshold is a path loss threshold, the first mapping relationship refers to a mapping relationship between a path loss measurement value and an RO set, as shown in Table 2. For example, the first device compares the path loss measurement value of an SSB or other reference signal with the path loss threshold, determines the RO resource location for random access based on the comparison result, and also determines the SSB beam used for random access based on the correspondence between the SSB and the RO.

[0322] Table 2

[0323] As shown in Table 2, the comparison results include comparison result #1, comparison result #2, comparison result #3, and comparison result #4, and the RO sets include RO set #1 and RO set #2. A row in Table 2 represents a mapping relationship between a comparison result and its corresponding RO set.

[0324] For example, if the path loss measurement value of the SSB beam measured by the first device is greater than or equal to the path loss threshold #1, RO set #1 can be determined according to the first mapping relationship in Table 2, and then the first device can select an RO from RO set #1 as the first RO; or, if the path loss measurement value of the SSB beam measured by the first device is less than the path loss threshold, RO set #2 can be determined according to the first mapping relationship in Table 2, and then the first device can select an RO from RO set #2 as the first RO.

[0325] Optionally, if there is no RO that meets the above requirements, the first device will not use the first resource for initial random access.

[0326] The first mapping relationship is exemplified in table form below. If the first threshold is a transmit power threshold, the first mapping relationship refers to a mapping relationship between a transmit power estimate and an RO set, as shown in Table 3. For example, the first device calculates a transmit power estimate based on a path loss obtained by measuring an SSB or other reference signal, compares the estimated transmit power with the power threshold, and determines the RO resource location for random access based on the comparison result. At the same time, the SSB beam used for random access can also be determined based on the correspondence between the SSB and the RO.

[0327] Table 3

[0328] As shown in Table 3, the comparison results include comparison result #1, comparison result #2, comparison result #3, and comparison result #4, and the RO sets include RO set #1 and RO set #2. A row in Table 3 represents a mapping relationship between a comparison result and its corresponding RO set.

[0329] Exemplarily, if the estimated transmit power value of the SSB beam measured by the first device is greater than or equal to the path loss threshold #1, RO set #1 can be determined according to the first mapping relationship in Table 3, and then the first device can select an RO from RO set #1 as the first RO; or, if the estimated path loss value of the SSB beam measured by the first device is less than the path loss threshold, RO set #2 can be determined according to the first mapping relationship in Table 3, and then the first device can select an RO from RO set #2 as the first RO.

[0330] Optionally, if there is no RO that meets the above requirements, the first device will not use the first resource for initial random access.

[0331] It should be noted that the above Tables 1 to 3 are only examples given for ease of understanding, and other schemes are not excluded. Optionally, the present application does not limit the number of first mapping relationships in Tables 1 to 3 (for example, a row in a table), or in other words, the present application does not limit the number of comparison results in Tables 1 to 3, for example, the comparison results, or RO sets, etc. can be increased or decreased. For example, the multiple tables in Tables 1 to 3 can be combined into one table, or any of the above tables can be split into multiple tables, for example, comparison results #1 to comparison results #4, comparison results #5 to comparison results #8, and comparison results #9 to comparison results #12 in Table 1 can be independently formed into new tables, or Table 1 can be split into multiple other tables for example, and the present application does not limit this, nor does the splitting method limit it.

[0332] It should be noted that, based on the above method, the first RO is located in the SBFD time domain unit. Optionally, the first device in the present application can also determine the second RO on the PRACH resource (i.e., the second resource) on the UL time domain unit and randomly access the second RO. The following examples illustrate the implementation method of determining random access on the first RO or the second RO in two scenarios.

[0333] Scenario 1: Exemplarily, the first device obtains a second measurement result, and determines a first RO or a second RO according to the second measurement result and a first threshold, wherein the first RO is located in a first resource and the second RO is located in a second resource.

[0334] For example, when the second measurement result is greater than or equal to the RSRP threshold, the first RO is located on the first resource, that is, the first device randomly accesses the first resource.

[0335] For example, when the second measurement result is less than or equal to the RSRP threshold, the second RO is located on the second resource, that is, the first device randomly accesses the second resource;

[0336] For example, when the second measurement result is less than or equal to the path loss threshold, the first RO is located on the first resource, that is, the first device randomly accesses the first resource.

[0337] For example, when the second measurement result is greater than or equal to the path loss threshold, the second RO is located on the second resource, that is, the first device randomly accesses the first resource.

[0338] Based on the above example, the first device can randomly access the first resource or the second resource, while ensuring random access performance and reducing signal interference.

[0339] Scenario 2: Exemplarily, the first device obtains a second measurement result, and determines a first RO or a second RO according to the second measurement result and a first threshold, wherein the first RO is located in the first resource and the second RO is located in the second resource.

[0340] For example, when the second measurement result is less than or equal to the RSRP threshold, the first RO is located on the first resource, that is, the first device randomly accesses the first resource.

[0341] For example, when the second measurement result is greater than or equal to the RSRP threshold, the second RO is located on the second resource, that is, the first device randomly accesses the second resource;

[0342] For example, when the second measurement result is greater than or equal to the path loss threshold, the first RO is located on the first resource, that is, the first device randomly accesses the first resource.

[0343] For example, when the second measurement result is less than or equal to the path loss threshold, the second RO is located on the second resource, that is, the first device randomly accesses the first resource.

[0344] Based on the above example, considering that the PRACH resources on the SBFD time domain unit may be used to expand PRACH coverage, such as using a longer random access preamble or allowing a larger repetition level, the logic of determining the PRACH resources for random access by judging the threshold and the measurement value may change. In particular, when the UE coverage is limited (such as when the RSRP is small), the UE can select the PRACH resources on the UL time domain unit for random access to ensure random access performance.

[0345] In a second implementation, the first device determines a first RO based on a first comparison result and a second comparison result, where the first comparison result is a comparison result of a frequency distance threshold and a first distance, and the second comparison result is a comparison result of a frequency distance threshold and a second distance, where the first distance is the distance between the first RO and a first frequency point, and the second distance is the distance between the second RO and the first frequency point. The first frequency point is within the second sub-band. Optionally, the first frequency point may also be within the first sub-band, for example, a frequency point immediately adjacent to the second sub-band.

[0346] Exemplarily, the first comparison result indicates that the frequency distance threshold is greater than or equal to the first distance, and the second comparison result indicates that the frequency distance threshold is less than the second distance, which means that the distance between the first RO and the first frequency point is greater than or equal to the frequency threshold, and the distance between the second RO and the first frequency point is less than the frequency threshold, that is, the first RO is farther away from the downlink sub-band, and the second RO is closer to the downlink sub-band, and random access on the first RO causes less interference than random access on the second RO.

[0347] Optionally, the first device randomly selects an RO, ie, a first RO, from a set of ROs that meet a distance-frequency threshold comparison condition.

[0348] Optionally, this implementation may further include a third comparison result or a fourth comparison result. Accordingly, the third comparison result is the result of comparing the frequency distance threshold and the third distance, and the fourth comparison result is the result of comparing the frequency distance threshold and the fourth distance. The third distance is the distance between the third RO and the first frequency, and the fourth distance is the distance between the fourth RO and the first frequency. The first frequency is located within the second sub-band. Optionally, the first frequency may also be located within the first sub-band, for example, a frequency immediately adjacent to the second sub-band. It should be understood that the distance between the third RO and the first frequency is less than the frequency threshold, and the distance between the fourth RO and the first frequency is also less than the frequency threshold. That is, the third and fourth ROs are closer to the downlink sub-band, and random access on the first RO causes less interference than random access on the third and fourth ROs.

[0349] It should be noted that the first frequency point can be located in the second sub-band (downlink sub-band) or in the first sub-band (uplink sub-band). In addition, the first frequency point can be one or two, and the position of the first frequency point will affect the selection of the RO for random access. Below, in combination with Figure 17, examples are given of how the position of the first frequency point affects the selection of the RO for random access through case one and case two, respectively. As shown in Figure 17, the first sub-band (for example, the uplink sub-band) on the SBFD time domain unit includes a first resource (for example, PRACH, corresponding to the large dotted box), wherein the small dotted box refers to the RO selected on the PRACH resource for sending the preamble, and the small black dot in the figure indicates the position of the first frequency point (or also includes the second frequency point).

[0350] Case 1: A scenario in which the frequency domain unit corresponding to the SBFD time domain unit includes one downlink subband.

[0351] For example, in FIG17( a ), the first frequency point is located in the second sub-band, and the first RO can be determined based on the above solution, that is, an RO whose frequency distance from the second sub-band is greater than or equal to the frequency threshold is selected as the first RO.

[0352] For example, in (b) of Figure 17, the first frequency point is located in the first sub-band, and the first device can select an RO far away from the second sub-band for random access based on the relationship between the PRACH resource, the first frequency point position and the second sub-band position. For example, in (b) of Figure 17, the distance between the first frequency point located in the first sub-band and the second sub-band is greater than the distance between any RO on the PRACH resource and the second sub-band, then the first device can select one or more ROs associated with the SSB, and arbitrarily select an RO therefrom, calculate the distance between the RO and the first frequency point, and if the distance is less than or equal to the frequency distance threshold, the first device can use the first RO for random access.

[0353] Optionally, if the distance between the first RO and the first frequency point is less than or equal to the frequency distance threshold, and the distance between the second RO and the first frequency point is greater than the frequency distance threshold, indicating that the first RO is farther from the second subband, the first RO is selected for random access.

[0354] For example, in (c1) of Figure 17 , the first frequency point is located in the frequency band corresponding to the PRACH resource. The first device may select one or more ROs associated with the SSB, and arbitrarily select an RO from among them to calculate the distance between the RO and the first frequency point. If the distance between the first frequency point and the second subband is smaller than the distance between the RO and the second subband, then if the distance between the first frequency point and the RO is less than or equal to the frequency distance threshold, the first device may use the RO for random access. If the distance between the first frequency point and the second subband is larger than the distance between the RO and the second subband, then if the distance between the first frequency point and the RO is greater than or equal to the frequency distance threshold, the first device may use the RO for random access.

[0355] For example, in (c2) of Figure 17 , the first frequency point is located in the frequency band corresponding to the PRACH resource. The first device may select one or more ROs associated with the SSB, arbitrarily select an RO from among them, and calculate the distance between the RO and the first frequency point. If the distance between the first frequency point and the second subband is smaller than the distance between the RO and the second subband, the first device may use the RO for random access. If the distance between the first frequency point and the second subband is larger than the distance between the RO and the second subband, the first device may not use the RO for random access.

[0356] It should be noted that the frequency distance threshold in this implementation can be one or two. If there are two frequency thresholds, corresponding different ROs are allocated.

[0357] For example, in (d) of FIG17 , the distance between the first frequency point in the first subband and the second subband is smaller than the distance between any RO on the PRACH resource and the second subband. In this case, the first device may select one or more ROs associated with the SSB, and arbitrarily select one RO from them. The distance between the RO and the first frequency point is calculated. If the distance is greater than or equal to the frequency distance threshold, the first device may use the first RO for random access.

[0358] Optionally, if the distance between the first RO and the first frequency point is greater than or equal to a frequency distance threshold, and if the distance between the second RO and the first frequency point is less than the frequency distance threshold, the first device may use the first RO for random access.

[0359] In summary, the first device can select an RO that is far away from the second sub-band from the PRACH resources for random access, thereby reducing CLI interference while ensuring random access performance.

[0360] Case 2: The frequency domain unit corresponding to the SBFD time domain unit includes two downlink subbands.

[0361] For example, in (e) of FIG17 , there are two first frequency points, each located in the second sub-band. Then, the first RO can be determined based on the above scheme, that is, the RO whose frequency distance is greater than or equal to the frequency distance threshold is selected as the first RO (both distance associations meet the requirements);

[0362] For example, in (f) of Figure 17 , there are two first frequency points, both located in the first sub-band and not in the frequency band corresponding to the PRACH resource. In this case, the first RO can be determined based on the above solution, that is, the RO with a frequency distance greater than or equal to the frequency threshold is selected as the first RO (both distance associations meet the requirements);

[0363] For example, in (g) of Figure 17, there is one first frequency point, which is located at the center of the first subband or at the frequency band corresponding to the PRACH resource or at the center of the frequency band corresponding to the PRACH resource, then the RO with a frequency distance less than or equal to the frequency threshold is selected as the first RO.

[0364] It should be noted that, for the two first frequency points, there may be one frequency distance threshold or two frequency distance thresholds, which correspond one to one with the two first frequency points.

[0365] In summary, the first device can select an RO that is far away from the second sub-band from the PRACH resources for random access, thereby reducing CLI interference while ensuring random access performance.

[0366] Optionally, placing the first frequency point on the far left in the figure is only an example given for ease of understanding, and this application does not limit its specific position.

[0367] Optionally, in a possible design, when the distance between the first RO and the second frequency point is greater than or equal to a frequency distance threshold, the first RO may be used for CBRA; or, when the distance between the first RO and the second frequency point is less than the frequency distance threshold, the first RO is used for CFRA.

[0368] In other words, the first resource located on the SBFD time domain unit is used for random access, wherein the first resource includes multiple ROs. If the distance between the RO and the second frequency point in the downlink subband on the SBFD time domain unit is greater than or equal to the frequency distance threshold, the RO can be used for CBRA; or, if the distance between the RO and the second frequency point in the downlink subband on the SBFD time domain unit is less than the frequency distance threshold, the RO can be used for CFRA.

[0369] For example, as shown in (a) of FIG13 , the time domain includes an SBFD time slot and a UL time slot, and the frequency domain includes two downlink subbands and one uplink subband. The dotted box in the figure represents a PRACH resource, which is used for random access by the first device. The large dotted box on the SBFD time slot represents the first resource, and the small dotted box in the first resource is farther from the downlink subband than the large dotted box. That is, if the distance between the first RO in the first resource and the second frequency point in the downlink subband is greater than or equal to the frequency distance threshold, the first RO is considered to be located in the small dotted box, and the PRACH resource in the small dotted box is used for CBRA; if the distance between the first RO in the first resource and the second frequency point in the downlink subband is less than the frequency distance threshold, the first RO is considered to be located in the large dotted box, and the PRACH resource in the large dotted box can be used for CFRA.

[0370] Therefore, the first device can select, based on the obtained frequency distance threshold, an RO whose location is greater than (or greater than or equal to) the frequency distance threshold from the boundary of the downlink subband (i.e., the second subband) or a frequency point in any given downlink subband (i.e., the second subband) as the RO that sends the preamble in the CBRA case, and the remaining ROs or all ROs can be used as the RO that sends the preamble in the CFRA case.

[0371] Based on the above approach, the first RO is located within the SBFD time domain unit. Optionally, the first apparatus in the present application may further determine a second RO on a PRACH resource (i.e., a second resource) on the UL time domain unit and perform random access on the second RO. The following example illustrates an implementation method in which the first apparatus determines random access on the first RO or the second RO.

[0372] Exemplarily, the first device obtains a second measurement result, and determines a first RO or a second RO according to the second measurement result and a first threshold, wherein the first RO is located in the first resource and the second RO is located in the second resource.

[0373] For example, the distance between the first RO and the second frequency point is greater than or equal to a frequency distance threshold, and the second frequency point is located in the second sub-band.

[0374] For example, the distance between the second RO and the second frequency point is less than or equal to the frequency distance threshold, and the second frequency point is located in the second sub-band.

[0375] Optionally, the second frequency point may also be located in the first sub-band, for example, a frequency point adjacent to the second sub-band.

[0376] Based on the above example, the first device determines random access on the first resource or the second resource based on the distance between the RO and the second frequency point and the comparison result between the frequency distance thresholds, which can improve the random access performance while reducing signal interference as much as possible.

[0377] For example, as shown in FIG13( b ), the time domain includes an SBFD time slot and a UL time slot. The frequency domain corresponding to the SBFD time slot includes two downlink subbands and one uplink subband. The dotted box in the figure represents a PRACH resource, which is used for random access by the first device. The large dotted box on the SBFD time slot represents the first resource. The small dotted box in the first resource is farther from the downlink subband than the large dotted box. That is, the RO in the large dotted box is suitable for CFRA, or in other words, the RO in the large dotted box is suitable for random access by UEs with low interference levels. The RO in the small dotted box is suitable for CBRA, or in other words, the RO in the small dotted box is suitable for random access by UEs with high interference levels. In comparison, the dotted box on the UL time slot represents a PRACH resource. For UEs with strong or particularly strong interference levels, random access can be performed directly on the PRACH resources in the UL time slot instead of on the PRACH resources in the SBFD time slot, thereby ensuring random access performance while reducing signal interference.

[0378] That is, if there is no RO that meets the above threshold requirement, the first device will not use the first resource on the SBFD time slot for initial random access, and may use the second resource on the UL time slot for initial random access to ensure random access performance.

[0379] S1130: The first device randomly accesses the first RO.

[0380] For example, based on the first RO determined in the above steps, the first device sends a random access preamble on the first RO. For specific implementation, refer to the relevant description of the above method 400 or 500. Random access on the first RO can minimize signal interference caused by uplink and downlink transmissions and improve random access performance.

[0381] Based on the above scheme, by comparing the measurement results with the first threshold, the RO for random access is determined, and then the random access preamble code is sent on the RO. By controlling the average UE-UE interference level caused by random access in the cell, a compromise between UE access capability enhancement and interference control is achieved, that is, while ensuring random access performance, signal interference is reduced.

[0382] Figure 14 is a flow chart of a communication method provided by an embodiment of the present application. As shown in Figure 14, the method 1400 includes the following multiple steps. In this implementation, the first device first detects and then determines whether to perform random access. For example, the first device first detects the downlink signal power of the base station or the uplink interference power from other UEs on the measurement resource (the measurement resource is a downlink resource), and then decides whether to use the PRACH resource on the SBFD time domain unit to send the preamble based on the measurement result.

[0383] S1410: The second device sends first information to the first device.

[0384] Accordingly, the first device receives the first information from the second device.

[0385] Among them, the first information indicates the first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first time domain resource is located in the first time domain unit, the first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first subband.

[0386] It should be understood that for the first information and the first resource, reference may be made to the relevant description of the above method 900 and will not be further explained here.

[0387] As shown in (a) of Figure 15, the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit), and the vertical axis represents the frequency domain, including a first subband (such as an uplink subband) and a second subband (such as a downlink subband) (i.e., the first subband and the second subband are regarded as the first frequency domain unit), wherein the first resource is the PRACH resource of the uplink subband located on the SBFD time slot, that is, the dotted box in the UL subband on the SBFD time slot can represent the PRACH resource. For example, the first resource is located at the top of the UL, that is, the first resource is the farthest distance from the downlink subband, which can reduce transmission interference as much as possible and ensure random access performance.

[0388] S1420: The first device obtains a first measurement resource.

[0389] In the first example, the first measurement resource can be predefined or preconfigured, where predefinition can include predefinition, such as protocol definition, and preconfiguration can be achieved by pre-saving corresponding codes, tables, functions, texts, strings or other methods that can be used to indicate the first measurement resource in the first device. This application does not limit its specific implementation method.

[0390] In a second example, the second information may be configured through signaling. Exemplarily, the second device sends information to the first device, and correspondingly, the first device receives the information from the second device and parses the information to obtain the first measurement resource.

[0391] Optionally, the resources used for signal measurement (eg, first measurement resources) may be periodic, or in other words, the present application does not limit the number of first measurement resources.

[0392] Optionally, the resources used for signal measurement (eg, first measurement resources) may be located in an SBFD time domain unit, such as an SBFD time slot or an SBFD symbol, and occupy REs corresponding to the SBFD time domain unit in the frequency domain.

[0393] As shown in FIG15( a ), a dotted box within a downlink (DL) subband in an SBFD time slot may represent a first measurement resource. For example, a first device may detect the downlink signal power of a base station on the first measurement resource to determine interference of the first device on other UEs.

[0394] Optionally, the present application does not limit the position of the first measurement resource in the downlink subband. For example, the first measurement resource may be located in the second subband of the SBFD time slot or SBFD symbol, and may be adjacent to the first subband.

[0395] S1430: The first device measures signal strength on a first measurement resource to obtain a first measurement result.

[0396] Exemplarily, the UE determines the resource closest to the current moment among the measurement resources indicated by the base station, receives a signal on this resource, calculates the power of the received signal, compares the power with the threshold indicated by the base station, and obtains a first measurement result.

[0397] S1440. The first device determines whether to perform random access on the first resource according to the first measurement result.

[0398] The first measurement result may be obtained by measuring a downlink signal from a network device.

[0399] Optionally, the first signal strength threshold may be predefined or preconfigured, wherein predefinition may include predefinition, such as protocol definition, and preconfiguration may be achieved by pre-saving corresponding codes, tables, functions, texts, strings or other methods that can be used to indicate the first signal strength threshold in the first device. This application does not limit its specific implementation method.

[0400] Optionally, the first signal strength threshold may be configured via signaling. For example, the second device sends information to the first device, and correspondingly, the first device receives the information from the second device and parses the information to obtain the first signal strength threshold.

[0401] In an example, random access is performed on the first resource when the first measurement result is greater than or equal to a first signal strength threshold.

[0402] For example, the second device sends downlink data on the designated first measurement resource. If the signal strength measured by the first device is greater than the first signal strength threshold, it means that the downlink signal is strong enough, and the first device can use the PRACH resource on the SBFD time domain unit for random access without causing strong interference. Optionally, the first device uses the RO that meets the random access requirements and is closest to the detection time to send the preamble (which means that the association relationship between the SSB beam and the RO in the current protocol is met).

[0403] In another example, when the first measurement result is less than the first signal strength threshold, random access is not performed on the first resource.

[0404] That is to say, the first device receives a signal on a first measurement resource and measures the calculated signal power. If the measurement result meets the threshold comparison condition, the first device may select an RO located after the first measurement resource for sending a preamble; conversely, if the measurement result does not meet the threshold comparison condition, the first device may not perform random access, or the first device may continue to perform signal detection on the periodic measurement resource until the measurement result meets the threshold condition and then randomly accesses.

[0405] Optionally, in a possible design, the method also includes: the first device obtains a second measurement resource, the second measurement resource includes a third time domain resource and a third frequency domain resource, the third time domain resource and the third frequency domain resource correspond to each other, the third time domain resource is located in the first time domain unit, and the third frequency domain resource is located in the first subband; measuring the signal strength on the second measurement resource to obtain a second measurement result; and determining whether to randomly access the first resource based on the first measurement result and the second measurement result.

[0406] The second measurement result may be obtained by measuring uplink signals from other terminals.

[0407] Optionally, the second signal strength threshold may be predefined or preconfigured, or may be indicated by signaling, which is not specifically limited in this application.

[0408] Optionally, the resources used for signal measurement (eg, second measurement resources) may be periodic, or in other words, the present application does not limit the number of second measurement resources.

[0409] Optionally, the resources used for signal measurement (eg, second measurement resources) may be located in an SBFD time domain unit, such as an SBFD time slot or an SBFD symbol, and occupy REs corresponding to the SBFD time domain unit in the frequency domain.

[0410] Exemplarily, the second device ensures that downlink data is not sent on the designated first measurement resource. If the signal strength measured by the first device (i.e., the first measurement result) is less than the second signal strength threshold, it means that the uplink signals of the remaining UEs interfere weakly with the downlink signal at the frequency position. The first device can use the PRACH resource on the SBFD time domain unit for random access without causing strong interference.

[0411] For example, when the first measurement result is greater than or equal to a first signal strength threshold, and the second measurement result is less than or equal to a second signal strength threshold, random access is performed on the first resource.

[0412] For example, when the first measurement result is less than a first signal strength threshold, and / or the second measurement result is greater than a second signal strength threshold, random access is not performed on the first resource.

[0413] As shown in Figure 15(b), the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit), and the vertical axis represents the frequency domain, including one first subband (e.g., an uplink subband) and two second subbands (e.g., a downlink subband) (i.e., the first subband and the second subband are considered the first frequency domain unit). Optionally, the second subband includes a third subband and a fourth subband, which are located on either side of the first subband in the time domain. The third subband can be considered to be located above the first subband, and the fourth subband can be considered to be located below the first subband, i.e., both the third subband and the fourth subband are downlink subbands. The first resource is the PRACH resource in the uplink subband in the SBFD time slot. The large dashed box in the UL subband in the SBFD time slot represents the PRACH resource. The dashed box in the downlink (DL) subband in the SBFD time slot represents the first measurement resource, and the small dashed box in the uplink (UL) subband in the SBFD time slot represents the second measurement resource. For example, the first device can detect the downlink signal power of the base station on the first measurement resource to determine the interference of the first device on other UEs, and detect the uplink signal power of other UEs on the second measurement resource to determine the interference of other UEs on the first device, which can reduce transmission interference as much as possible and ensure random access performance.

[0414] Optionally, the present application does not limit the location of the first measurement resource within the third subband, nor the location of the second measurement resource within the first resource. For example, the first measurement resource may be located in the third subband of an SBFD time slot or SBFD symbol, adjacent to the first subband, and the second measurement resource may be located in the first subband of the SBFD time slot or SBFD symbol.

[0415] Optionally, in one possible design, the second subband includes a third subband and a fourth subband, and the third subband and the fourth subband are respectively located on either side of the first subband in the frequency domain. The method further includes: the first device obtains a third measurement resource, the third measurement resource includes a fourth time domain resource and a fourth frequency domain resource, the fourth time domain resource and the fourth frequency domain resource correspond to each other, the fourth time domain resource is located in the first time domain unit, the fourth frequency domain resource is located in the third subband, and the second frequency domain resource is located in the fourth subband; measuring the signal strength on the third measurement resource to obtain a third measurement result; and determining whether to perform random access on the first resource based on the first measurement result and the third measurement result.

[0416] Optionally, the resources used for signal measurement (eg, third measurement resources) may be periodic, or in other words, the present application does not limit the number of third measurement resources.

[0417] Optionally, the resources used for signal measurement (eg, third measurement resources) may be located in an SBFD time domain unit, such as an SBFD time slot or an SBFD symbol, and occupy REs corresponding to the SBFD time domain unit in the frequency domain.

[0418] For example, when the first measurement result is greater than or equal to the first signal strength threshold, and the third measurement result is greater than or equal to the third signal strength threshold, random access is performed on the first resource.

[0419] Optionally, the first signal strength threshold and the third signal strength threshold may be the same or different, which is not limited in this application.

[0420] For example, when the first measurement result is less than the first signal strength threshold, and / or the third measurement result is greater than the third signal strength threshold, random access is not performed on the first resource.

[0421] As shown in (c) of Figure 15, the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit), and the vertical axis represents the frequency domain, including a first sub-band (such as an uplink sub-band) and two second sub-bands (such as downlink sub-bands) (i.e., the first sub-band and the second sub-band are regarded as the first frequency domain unit), wherein the first resource is the PRACH resource of the uplink sub-band located on the SBFD time slot, that is, the dotted box in the UL sub-band on the SBFD time slot can represent the PRACH resource. The dotted box in the third sub-band on the SBFD time slot can represent the third measurement resource, and the small dotted box in the fourth sub-band on the SBFD time slot can represent the first measurement resource. For example, the first device can detect the downlink signal power of the base station on the first measurement resource and the third measurement resource to determine the interference of the first device on other UEs, thereby reducing transmission interference as much as possible and ensuring random access performance.

[0422] Optionally, the present application does not limit the position of the first measurement resource in the fourth subband and the position of the third measurement resource in the third subband. For example, the first measurement resource and the third measurement resource may be located in the fourth subband and the third subband of the SBFD time slot or SBFD symbol, respectively, and may be adjacent to the first subband. For example, the first measurement resource and the third measurement resource may be located at the starting position of the SBFD time slot or SBFD symbol, or at the same position as the starting position of the time domain unit where the PRACH resource is located.

[0423] Optionally, in one possible design, when random access is not performed on the first resource, the method further includes: the first device obtains a fourth measurement resource, the fourth measurement resource includes a fifth time domain resource and a fifth frequency domain resource, the fifth time domain resource corresponds to the fifth frequency domain resource, the fifth time domain resource is located in the first time domain unit, and the fifth frequency domain resource is located in the third sub-band; obtains a fifth measurement resource, the fifth measurement resource includes a sixth time domain resource and a sixth frequency domain resource, the sixth time domain resource corresponds to the sixth frequency domain resource, the sixth time domain resource is located in the first time domain unit, and the sixth frequency domain resource is located in the fourth sub-band; measures the signal strength on the fourth measurement resource to obtain a fourth measurement result; measures the signal strength on the fifth measurement resource to obtain a fifth measurement result; and determines whether to perform random access on the first resource based on the fourth measurement result and the fifth measurement result.

[0424] Optionally, the resources used for signal measurement (eg, the fourth measurement resource and / or the fifth measurement resource) may be periodic, or in other words, the present application does not limit the number of the fourth measurement resources and / or the fifth measurement resources.

[0425] Optionally, the resources used for signal measurement (eg, the fourth measurement resource and / or the fifth measurement resource) may be located in an SBFD time domain unit, such as an SBFD time slot or an SBFD symbol, and occupy REs corresponding to the SBFD time domain unit in the frequency domain.

[0426] Optionally, the fourth signal strength threshold and the fifth signal strength threshold may be the same or different, which is not limited in this application.

[0427] Optionally, the first signal strength threshold and the fifth signal strength threshold may be the same, and the third signal strength threshold and the fourth signal strength threshold may be the same, which is not limited in this application.

[0428] For example, when the fourth measurement result is greater than or equal to the fourth signal strength threshold, and the fifth measurement result is greater than or equal to the fifth signal strength threshold, random access is performed on the first resource.

[0429] For example, when the fourth measurement result is less than the fourth signal strength threshold, and / or the fifth measurement result is less than the fifth signal strength threshold, random access is not performed on the first resource.

[0430] As shown in (d) of Figure 15, the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit), and the vertical axis represents the frequency domain, including a first sub-band (e.g., an uplink sub-band) and two second sub-bands (e.g., the downlink sub-band) (i.e., the first sub-band and the second sub-band are regarded as the first frequency domain unit), wherein the first resource is the PRACH resource of the uplink sub-band located on the SBFD time slot, i.e., the dotted box in the UL sub-band on the SBFD time slot can represent the PRACH resource. Compared with (c) of Figure 15, a fourth measurement resource located in the third sub-band on the SBFD time slot and a fifth measurement resource located in the fourth sub-band on the SBFD time slot are newly added. It should be noted that the first measurement resource and the fifth measurement resource are different, and the third measurement resource and the fourth measurement resource are different. For example, the first device can detect the downlink signal power of the base station on the fourth measurement resource and the fifth measurement resource to determine the interference of the first device on other UEs, thereby reducing transmission interference as much as possible and ensuring random access performance.

[0431] Optionally, the present application does not limit the position of the fourth measurement resource in the third subband and the position of the fifth measurement resource in the fifth subband. The fourth measurement resource and the fifth measurement resource are respectively located after the third measurement resource and the first measurement resource in the time domain. Optionally, the fourth measurement resource and the fifth resource may be respectively located in the fourth subband and the third subband of the SBFD time slot or SBFD symbol, and may be adjacent to the first subband.

[0432] It should be pointed out that the arrow in the above Figure 15 represents the PRACH resource associated with the measurement resource that can be used for random access. That is to say, the detection result on the current measurement resource indicates that random access can be performed on the first resource. The first device can send a random access preamble code to the second device at the position pointed by the arrow (or the PRACH resource position after the measurement resource) to achieve random access.

[0433] Optionally, the second device can allocate the RACH resources in the uplink subband on the SBFD time domain unit and the PRACH resources farther away from the downlink subband to important channels such as PRACH and PUCCH, and allocate the RACH resources in the uplink subband on the SBFD time domain unit and the PRACH resources closer to the downlink subband to less important channels such as PUSCH.

[0434] It should be noted that if the measurement result obtained by the first device in the current measurement resource detection indicates that random access is not performed on the first resource, the first device can continue to use other measurement resources for signal detection until the measurement result indicates that random access can be performed on the first resource. For example, in (d) of Figure 15, the third measurement resource and the fourth measurement resource are located in the third sub-band, and the two are different. The fifth measurement resource and the second measurement resource are located in the fourth sub-band, and the two are different. Optionally, the first measurement resource and the third measurement resource can be regarded as a group of measurement resources, and the fourth measurement resource and the fifth measurement resource can be regarded as a group of measurement resources. That is to say, when the first device finds that the interference is large after measuring the signal on the first group of measurement resources, it can continue to measure the next group of measurement resources until it finds a measurement resource with lower interference intensity, and then perform random access on the random access resource after the measurement resource. This application does not limit the number / number of groups of measurement resources on the SBFD time domain unit.

[0435] In other words, if there are multiple measurement resources (for example, see (d) of Figure 15, in the time domain, the fifth measurement resource is included after the first measurement resource, and the fourth measurement resource is included after the third measurement resource), then the first measurement resource is associated with the first resource (such as PRACH resource #1) between it and the fifth measurement resource, that is, signal detection on the first measurement resource is used to determine whether PRACH resource #1 can be used for random access of the first device. Similarly, the third measurement resource is associated with the first resource (such as PRACH resource #2) between it and the fourth measurement resource, that is, signal detection on the third measurement resource is used to determine whether PRACH resource #2 can be used for random access of the first device, and so on.

[0436] It should be understood that the frequency division multiplexing RO occupying the lowest frequency position in the frequency division multiplexing RO of the PRACH resource (which can be referred to as SBFD-PRACH) on the SBFD time domain unit starts from the lowest RE or lowest RB of the uplink subband on the SBFD time domain unit, or the frequency division multiplexing RO occupying the highest frequency position in the frequency division multiplexing RO of the SBFD-PRACH ends at the highest RE or highest RB of the uplink subband, or the center frequency position of the PRACH is aligned with the center frequency position of the uplink subband (the deviation does not exceed a given threshold, and the specific number can be predefined), or the PRACH does not occupy one or more RBs or REs closest to the downlink subband (the specific number can be predefined).

[0437] Based on the above solution, the first device obtains a first measurement resource and performs signal monitoring on the first measurement resource to obtain a first measurement result. Based on the first measurement result, the first device then determines whether to perform random access on the first resource. In this implementation, the decision on whether to use the first resource for random access is based on the strength of the signal interference detected by the first device. This effectively controls the level of CLI interference caused by random access by the first device within the cell, thereby improving the random access performance of the first device.

[0438] For the solutions shown in Figures 9, 11, and 14 above, the first device can select a first RO for random access in a first resource (e.g., a PRACH resource) within a first subband (uplink subband) on an SBFD time domain unit. Specifically, the first device can send a preamble on the first RO.

[0439] In one implementation, after receiving the first RO, the second device can determine one or more of the following: resources for sending RAR, resources for sending msg3, resources for sending msg4, or resources for sending msg5, so as to implement a complete random access process, which can effectively control CLI interference while improving random access performance.

[0440] For example, the frequency domain resources corresponding to the SBFD time domain unit include one uplink subband and two downlink subbands, namely, the first subband, the third subband, and the fourth subband. The third and fourth subbands can be referred to as second subbands, with the third subband located above the first subband and the fourth subband located below the first subband. After receiving the preamble from the first device on the first RO, the second device can determine one or more of the following: the resource for sending the RAR is located at the top of the third subband or the bottom of the fourth subband, farthest from the first subband; the resource for sending msg3 is located in the middle of the first subband and farthest from the second subband; the resource for sending msg4 is located at the top of the third subband or at the bottom of the fourth subband or at the bottom of the fourth subband and farthest from the first subband; and the resource for sending msg5 is located at the very center of the first subband and farthest from the second subband. It can be understood that the resource position for the first device to send PUSCH can be located in the middle of the first subband, and the resource position for the second device to send PDSCH can be located at the top of the third subband or the bottom of the fourth subband, which can effectively control CLI interference while improving random access performance.

[0441] For another example, the frequency domain resources corresponding to the SBFD time domain unit include an uplink subband and a downlink subband, namely, a first subband and a second subband. This application does not limit the frequency domain locations of the first subband and the second subband. For example, the first subband may be located above the second subband, or the first subband may be located below the second subband. Then, after receiving the preamble from the first device on the first RO, the second device may determine one or more of the following: if the first subband is located above the second subband, then the resources used to send the RAR are located at the bottom of the second subband, the resources used to send msg3 are located in the middle of the first subband and at the farthest distance from the second subband, the resources used to send msg4 are located at the bottom of the second subband, and the resources used to send msg5 are located in the middle of the first subband and at the farthest distance from the second subband. In other words, the resource location for the first device to send the PUSCH may be located in the middle of the first subband, and the resource location for the second device to send the PDSCH may be located at the bottom of the second subband. Alternatively, if the first subband is below the second subband, the resources used to send the RAR are located at the top of the second subband and farthest from the first subband, the resources used to send msg3 are located in the middle of the first subband and farthest from the second subband, the resources used to send msg4 are located at the top of the second subband and farthest from the first subband, and the resources used to send msg5 are located in the middle of the first subband and farthest from the second subband. In other words, the resources used by the first device to send the PUSCH can be located in the middle of the first subband, and the resources used by the second device to send the PDSCH can be located at the bottom of the second subband. This can effectively control CLI interference while improving random access performance.

[0442] 16 , an example is given below to illustrate the positional relationship of resources for sending preamble, RAR, msg3, msg4, and msg5 during random access on the SBFD time domain unit.

[0443] FIG16 is a schematic diagram illustrating the positional relationship of messages sent during a random access process according to an embodiment of the present application. As shown in FIG16(a), the horizontal axis represents the time domain, including the SBFD time slot (i.e., the first time domain unit), and the vertical axis represents the frequency domain, including a first subband (e.g., an uplink subband) and two second subbands (i.e., the third subband and the fourth subband, i.e., the downlink subband) (i.e., the first subband and the second subband are considered the first frequency domain unit). The first resource is a PRACH resource located in the uplink subband of the SBFD time slot. The large dashed box in the UL subband of the SBFD time slot represents the PRACH resource. The third subband and the fourth subband located in the SBFD time slot each include measurement resources (see the third measurement resource and the first measurement resource shown in FIG15(c)). For example, the first device can detect the downlink signal power of the base station on the first measurement resource and the third measurement resource, and obtain corresponding first and third measurement results, which are used to determine the interference of the first device on other UEs. For specific implementation methods, please refer to the relevant description above. Assuming that the first measurement result is greater than or equal to the first signal strength threshold, and the third measurement result is greater than or equal to the third signal strength threshold, it means that the signal quality is good and the CLI interference caused is low. The first device can select a position after the first measurement resource or the third measurement resource in the first resource for random access. For example, in the small dotted box within the large dotted box in the figure, the first device sends msg1 or msgA to the second device, carrying preamble. Correspondingly, the second device sends RAR on the resource corresponding to the second dotted box within the third subband. Correspondingly, the first device sends msg3 on the resource corresponding to the second small dotted box within the first subband. Correspondingly, the second device sends msg4 on the resource corresponding to the third dotted box within the third subband. Correspondingly, the first device sends msg5 on the resource corresponding to the third small dotted box within the first subband until the random access process is completed.

[0444] As shown in Figure 16(a), the first resource is located in the middle of the first subband, farthest from the downlink subbands (i.e., the third and fourth subbands). The resource used to send the RAR is located at the top of the third subband or the bottom of the fourth subband. The resource used to send msg3 is located in the middle of the first subband. The resource used to send msg4 is located at the top of the third subband or the bottom of the fourth subband or the bottom of the fourth subband. The resource used to send msg5 is located in the middle of the first subband. In other words, the resource location for sending the PUSCH can be located in the middle of the first subband, and the resource location for sending the PDSCH can be located at the top of the third subband or the bottom of the fourth subband. This can effectively control CLI interference while improving random access performance.

[0445] As shown in FIG16(b), the time domain includes an SBFD time slot and a UL time slot. The frequency domain corresponding to the SBFD time slot includes a downlink subband and an uplink subband. The first resource is a PRACH resource located in the uplink subband of the SBFD time slot. That is, the large dashed box in the UL subband of the SBFD time slot represents the PRACH resource. The second subband located in the SBFD time slot includes measurement resources (see the first measurement resource shown in FIG15(a)). For example, the first device can detect the downlink signal power of the base station on the first measurement resource and obtain a corresponding first measurement result, which is used to determine the interference of the first device on other UEs. For specific implementation methods, please refer to the relevant description above. Assuming that the first measurement result is greater than or equal to the first signal strength threshold, it means that the signal quality is good and the CLI interference caused is low. The first device can select a position after the first measurement resource in the first resource for random access. For example, in the small dotted box within the large dotted box in the figure, the first device sends msg1 or msgA to the second device, carrying preamble. Correspondingly, the second device sends RAR on the resource corresponding to the second dotted box in the second subband. Correspondingly, the first device sends msg3 on the resource corresponding to the second small dotted box in the first subband. Correspondingly, the second device sends msg4 on the resource corresponding to the third dotted box in the third subband. Correspondingly, the first device sends msg5 on the resource corresponding to the third small dotted box in the first subband until the random access process is completed.

[0446] As shown in Figure 16(b), the first resource is located in the middle of the first subband, farthest from the downlink subband (i.e., the second subband). The resource used to send the RAR is located at the bottom of the second subband. The resource used to send msg3 is located in the middle of the first subband, the resource used to send msg4 is located at the bottom of the second subband, and the resource used to send msg5 is located in the middle of the first subband. In other words, the resource location for sending the PUSCH can be located in the middle of the first subband, and the resource location for sending the PDSCH can be located at the bottom of the second subband. This can effectively control CLI interference while improving random access performance.

[0447] It should be noted that in this application, unless otherwise specified or logically conflicting, the terms and / or descriptions of different embodiments are consistent and can be referenced from each other. The technical features of different embodiments can be combined to form new embodiments based on their inherent logical relationships. For example, the above-mentioned second device determines and allocates transmission resources for the first device during the random access process, which can be applied to the schemes shown in Figures 9, 11, and 14. That is, the two can be combined or referenced with each other, and the specific implementation method will not be described again.

[0448] The communication method embodiment of the present application is described in detail above with reference to Figures 1 to 17 . The communication device embodiment of the present application will be described in detail below with reference to Figures 18 and 19 . It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for portions not described in detail, reference can be made to the aforementioned method embodiment.

[0449] Figure 18 is a schematic diagram of a communication device provided in accordance with an embodiment of the present application. As shown in Figure 18, a communication device 1800 includes a processing module 1810 and a communication module 1820. The communication device 1800 can be a first device, which can be a terminal device, or a communication device applied to a terminal device or used in conjunction with a terminal device and capable of implementing a method executed by the terminal device, such as a chip, a chip system or circuit, etc.; or, the communication device 1800 can be a second device, which can be a network device, or a communication device applied to a network device or used in conjunction with a network device and capable of implementing a method executed by the network device, such as a chip, a chip system or circuit, a DU or a CU, etc.

[0450] The communication module 1820 may also be referred to as a transceiver module, transceiver, transceiver unit, or transceiver device. The processing module 1810 may also be referred to as a processor, processing board, processing unit, or processing device. Optionally, the communication module 1820 is configured to perform the sending and receiving operations of the first or second device in the above-described method. The components in the communication module 1820 that implement the receiving function may be considered a receiving unit, and the components in the communication module 1820 that implement the transmitting function may be considered a transmitting unit. That is, the communication module 1820 includes a receiving unit and / or a transmitting unit. Optionally, the processing module 1810 is configured to implement the processing functions of the first or second device in the above-described method.

[0451] In addition, it should be noted that the aforementioned communication module and / or processing module can be implemented by a virtual module, for example, the processing module can be implemented by a software functional unit or a virtual device, and the communication module can be implemented by a software function or a virtual device. Alternatively, the processing module or the communication module can also be implemented by a physical device, for example, if the device is implemented using a chip / circuit (such as an integrated circuit or a logic circuit, etc.). The communication module can be an input and output circuit and / or a communication interface, performing input operations (corresponding to the aforementioned receiving operations) and output operations (corresponding to the aforementioned sending operations); the processing module is an integrated processor or microprocessor or circuit (such as an integrated circuit or a logic circuit, etc.).

[0452] The division of modules in this application is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the examples of this application may be integrated into a single processor, exist physically as separate modules, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in either hardware or software functional modules.

[0453] FIG19 is a schematic diagram of another communication device provided in an embodiment of the present application. As shown in FIG19 , optionally, the communication device 1900 can be the aforementioned first device or second device, or a chip or chip system or circuit for the aforementioned first device or second device. Optionally, in the present application, the chip system can be composed of chips, or can include chips and other discrete devices. Among them, the first device can be a terminal device, and the second device can be a network device, etc.

[0454] The communication device 1900 can be used to implement the functions of any device (e.g., terminal device, network device) in the communication system described in the above examples. The communication device 1900 may include at least one processing circuit 1910. Optionally, the processing circuit 1910 is coupled to a memory, and the memory may be located within the device, or the memory may be integrated with the processor, or the memory may be located outside the device. For example, the communication device 1900 may also include at least one memory 1920. The memory 1920 stores the necessary computer programs, computer programs or instructions and / or data for implementing any of the above examples; the processing circuit 1910 may execute the computer program stored in the memory 1920 to complete the method in any of the above examples.

[0455] The communication device 1900 may also include a transceiver circuit 1930, and the communication device 1900 can exchange information with other devices through the transceiver circuit 1930. Exemplarily, the transceiver circuit 1930 can be a transceiver, circuit, bus, module, pin or other type of communication interface. When the communication device 1900 is a chip-type device or circuit, the transceiver circuit 1930 in the device 1900 can also be an input-output circuit, or an interface circuit, which can input information (or receive information) and output information (or send information). When the communication device 1900 is a network device or a terminal device, the transceiver circuit 1930 can be a transmitter, a receiver or a transceiver, or a communication interface, which is not limited here.

[0456] The processing circuit 1910 may be one or more processors, or all or part of the processing circuits in one or more processors. The processing circuit 1910 may be an integrated processor, microprocessor, integrated circuit, or logic circuit, and the processor may determine output information based on input information.

[0457] Coupling in this application refers to an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, and is used for information exchange between devices, units, or modules. Processing circuit 1910 may operate in conjunction with memory 1920 and transceiver circuit 1930. This application does not limit the specific connection medium between the processing circuit 1910, memory 1920, and transceiver circuit 1930.

[0458] Optionally, as shown in FIG19 , the processing circuit 1910, the memory 1920, and the transceiver circuit 1930 are interconnected via a bus 1940. Optionally, the bus may include an address bus, a data bus, a control bus, and other types of buses. Furthermore, for ease of illustration, FIG19 shows one bus 1940, but this does not mean that there is only one bus or only one type of bus.

[0459] It should be understood that the processors mentioned in the embodiments of the present application may be the following devices or the circuit portions of the following devices used for processing functions: a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0460] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: 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), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0461] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0462] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0463] An embodiment of the present application further provides a computer-readable storage medium storing computer instructions for implementing the method executed by the first device or the second device in the above embodiment.

[0464] An embodiment of the present application further provides a computer program product, which includes: computer program code or instructions, which, when executed by a computer, implements the method performed by the first device or the second device in the above embodiment.

[0465] An embodiment of the present application further provides a communication system, which includes the first device or the second device in the above embodiment.

[0466] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above and will not be described again here.

[0467] To facilitate understanding of the above embodiments provided in this application, the following points are explained:

[0468] 1) In this application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0469] 2) In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple, respectively.

[0470] 3) Throughout this application, the terms "first," "second," and various numerical references (e.g., #1, #2, etc.) are used to distinguish between different messages for ease of description and are not intended to limit the scope of the embodiments of this application. For example, they are used to distinguish between different messages, rather than to describe a specific order or precedence. It should be understood that such references are interchangeable, where appropriate, to allow for the description of scenarios beyond the embodiments of this application.

[0471] 4) In this application, descriptions such as "when...", "in the case of...", and "if" all mean that the device will perform corresponding processing under certain objective circumstances. They do not limit the time, nor do they require the device to perform judgment actions when implementing them, nor do they mean that there are other limitations.

[0472] 5) In this application, "indicate" or "used to indicate" can include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used to indicate A, it can include that the indication information directly indicates A or indirectly indicates A, and does not necessarily mean that the indication information carries A.

[0473] The indication methods involved in the embodiments of this application should be understood to encompass various methods that enable the party to be indicated to obtain information about the information to be indicated. The information to be indicated can be sent as a whole or divided into multiple sub-information and sent separately. The transmission period and / or timing of these sub-information can be the same or different. This application does not limit the transmission method, for example.

[0474] In the embodiments of the present application, the "indication information" may be an explicit indication, i.e., a direct indication via signaling, or may be obtained based on parameters indicated by the signaling, in combination with other rules, other parameters, or by deduction. It may also be an implicit indication, i.e., based on a rule or relationship, or based on other parameters, or by deduction. This application does not impose specific limitations on this.

[0475] 6) In this application, "protocol" may refer to a standard protocol in the field of communications, such as 5G protocol, NR protocol, and related protocols used in future communication systems, which is not limited in this application. "Predefined" may include pre-definition. For example, protocol definition. "Preconfiguration" can be implemented by pre-saving corresponding codes, tables, or other methods that can be used to indicate relevant information in the device, and this application does not limit its implementation method.

[0476] 7) In this application, "communication" may also be described as "data transmission", "information transmission", "data processing", etc. "Transmission" includes "sending" and "receiving".

[0477] 8) In this application, "sending information to XX (device)" can be understood as the destination of the information being the device. This can include sending information directly or indirectly to the device. "Receiving information from XX (device)" can be understood as the source of the information being the device, which can include receiving information directly or indirectly from the device. The information may undergo necessary processing between the source and destination, such as format changes, but the destination can still understand the valid information from the source.

[0478] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0479] In this application, under the premise of no logical contradiction, the examples can reference each other, for example, the methods and / or terms between method embodiments can reference each other, for example, the functions and / or terms between device embodiments can reference each other, for example, the functions and / or terms between device examples and method examples can reference each other.

[0480] It should be understood that in some of the above embodiments, the devices in the existing network architecture are mainly used as examples for illustrative description, and the specific form of the devices is not limited in the embodiments of the present application. For example, devices that can achieve the same functions in the future are applicable to the embodiments of the present application.

[0481] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0482] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be described again here.

[0483] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0484] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0485] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0486] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0487] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: receiving first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, a first part of the first time domain resource being located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource being located in the first frequency domain unit, and the first information further indicating whether random access is performed on the first resource; Random access or non-random access is performed on the first resource according to the first information.

2. A communication method, characterized in that: include: Determine first information, where the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, and the first information further indicates whether random access is performed on the first resource; The first information is sent.

3. The method according to claim 1 or 2, characterized in that The first information includes second information and third information, the second information indicates the first resource, and the third information indicates whether random access is performed on the first resource.

4. The method according to any one of claims 1 to 3, characterized in that Randomly accessing or not randomly accessing the first resource according to the first information includes: When the first information indicates random access on the first resource and the first device is in an idle state or an inactive state, the first device randomly accesses the first resource.

5. The method according to any one of claims 1 to 3, characterized in that Randomly accessing or not randomly accessing the first resource according to the first information includes: When the first information indicates random access on the first resource and the first device is in a non-idle state, the first device does not perform random access on the first resource.

6. The method according to claim 5, characterized in that The second part of the first time domain resource is located in the second time domain unit, the second part is the time domain resource of the second resource, and the second time domain unit is only used for uplink transmission; wherein, The first information indicates not to perform random access on the second resource; or In a case where the second resource partially overlaps with the third resource, the first information indicates random access on non-overlapping resources, where the non-overlapping resources are resources that do not overlap at all between the second resource and the third resource, a time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured; or In the case that the second resource and the third resource do not overlap, the first information indicates random access on the second resource, the time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

7. The method according to claim 6, characterized in that The first time domain unit includes a sub-band full-duplex (SBFD) time domain unit, and the second time domain unit includes an uplink (UL) time domain unit.

8. The method according to any one of claims 1 to 7, characterized in that The second sub-band includes a third sub-band and a fourth sub-band, and the third sub-band and the fourth sub-band are located on both sides of the first sub-band in the time domain.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: When the first information indicates random access on the first resource, determining a first time-frequency physical random access channel opportunity RO from the first resource; A preamble is sent on the first RO.

10. The method according to claim 9, characterized in that The first information is further used to indicate that the first RO is used for contention-based random access (CBRA); or, The first information is further used to indicate that the first RO is used for contention-free random access (CFRA).

11. A communication method, characterized in that: include: receiving first information, where the first information indicates a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, the first time domain resource being located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource being located in the first frequency domain unit; Acquire second information, and determine a first time-frequency physical random access channel opportunity (RO) according to the first information and the second information, where the first RO is located in the first resource; Random access is performed on the first RO.

12. The method according to claim 11, characterized in that The second information indicates a first threshold, where the first threshold includes one or more of the following: a reference signal received power (RSRP) threshold, a path loss threshold, or a transmit power threshold; Determining a first RO according to the first information and the second information includes: obtaining a first measurement result; determining a first comparison result according to the first measurement result and the first threshold; The first RO is determined according to the first comparison result and a first mapping relationship, where the first mapping relationship indicates a mapping relationship between M comparison results and N RO sets, the M comparison results include the first comparison result, the first resource includes the N RO sets, the N RO sets include the first RO set, the first RO set includes the first RO, and M and N are both integers greater than or equal to 1.

13. The method according to claim 11 or 12, characterized in that The second information indicates a frequency distance threshold, and determining a first RO according to the first information and the second information includes: The first RO is determined according to a first comparison result and a second comparison result, where the first comparison result is a comparison result of the frequency distance threshold and the first distance, and the second comparison result is a comparison result of the frequency distance threshold and the second distance. The first distance is a distance between the first RO and a first frequency point, and the second distance is a distance between the second RO and the first frequency point. The first frequency point is located in the second sub-band.

14. The method according to any one of claims 11 to 13, characterized in that The second information indicates a frequency distance threshold; When the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, the first RO is used for contention-based random access (CBRA), and the second frequency point is located in the second subband; or, In a case where the distance between the first RO and the second frequency point is less than the frequency distance threshold, the first RO is used for contention-free random access (CFRA).

15. The method according to any one of claims 11 to 14, characterized in that The first time domain unit includes a sub-band full-duplex (SBFD) time domain unit.

16. The method according to any one of claims 11 to 15, characterized in that The second sub-band includes a third sub-band and a fourth sub-band, and the third sub-band and the fourth sub-band are located on both sides of the first sub-band in the time domain.

17. A communication method, characterized in that: include: receiving first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, the first time domain resource being located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource being located in the first subband; Acquire a first measurement resource, where the first measurement resource includes a second time domain resource and a second frequency domain resource, the second time domain resource corresponds to the second frequency domain resource, the second time domain resource is located in the first time domain unit, and the second frequency domain resource is located in the second subband; Measuring signal strength on the first measurement resource to obtain a first measurement result; Determine whether to perform random access on the first resource according to the first measurement result.

18. The method according to claim 17, characterized in that Determining whether to perform random access on the first resource according to the first measurement result includes: In a case where the first measurement result is greater than or equal to a first signal strength threshold, random access is performed on the first resource.

19. The method according to claim 17 or 18, characterized in that Determining whether to perform random access on the first resource according to the first measurement result includes: When the first measurement result is less than a first signal strength threshold, random access is not performed on the first resource.

20. The method according to any one of claims 17 to 19, characterized in that The method further comprises: Acquire a second measurement resource, where the second measurement resource includes a third time domain resource and a third frequency domain resource, the third time domain resource corresponds to the third frequency domain resource, the third time domain resource is located in the first time domain unit, and the third frequency domain resource is located in the first subband; Measuring the signal strength on the second measurement resource to obtain a second measurement result; Determine whether to perform random access on the first resource according to the first measurement result and the second measurement result.

21. The method according to claim 20, characterized in that Determining, according to the first measurement result and the second measurement result, whether to perform random access on the first resource includes: When the first measurement result is greater than or equal to a first signal strength threshold, and the second measurement result is less than or equal to a second signal strength threshold, random access is performed on the first resource.

22. The method according to any one of claims 17 to 19, characterized in that The second sub-band includes a third sub-band and a fourth sub-band, and the third sub-band and the fourth sub-band are respectively located on both sides of the first sub-band in the frequency domain; Acquire a third measurement resource, where the third measurement resource includes a fourth time domain resource and a fourth frequency domain resource, the fourth time domain resource corresponds to the fourth frequency domain resource, the fourth time domain resource is located in the first time domain unit, the fourth frequency domain resource is located in the third subband, and the second frequency domain resource is located in the fourth subband; Measuring the signal strength on the third measurement resource to obtain a third measurement result; Determine whether to perform random access on the first resource according to the first measurement result and the third measurement result.

23. The method according to claim 22, characterized in that Determining, according to the first measurement result and the third measurement result, whether to perform random access on the first resource includes: When the first measurement result is greater than or equal to a first signal strength threshold, and the third measurement result is greater than or equal to a third signal strength threshold, random access is performed on the first resource.

24. The method according to claim 22 or 23, characterized in that In the case of no random access on the first resource, Acquire a fourth measurement resource, where the fourth measurement resource includes a fifth time domain resource and a fifth frequency domain resource, the fifth time domain resource corresponds to the fifth frequency domain resource, the fifth time domain resource is located in the first time domain unit, and the fifth frequency domain resource is located in the third subband; Acquire a fifth measurement resource, where the fifth measurement resource includes a sixth time domain resource and a sixth frequency domain resource, the sixth time domain resource corresponds to the sixth frequency domain resource, the sixth time domain resource is located in the first time domain unit, and the sixth frequency domain resource is located in the fourth subband; Measuring signal strength on the fourth measurement resource to obtain a fourth measurement result; Measuring the signal strength on the fifth measurement resource to obtain a fifth measurement result; Determine whether to perform random access on the first resource according to the fourth measurement result and the fifth measurement result.

25. The method according to claim 24, characterized in that Determining, according to the fourth measurement result and the fifth measurement result, whether to perform random access on the first resource includes: When the fourth measurement result is greater than or equal to a fourth signal strength threshold, and the fifth measurement result is greater than or equal to a fifth signal strength threshold, random access is performed on the first resource.

26. The method according to claim 24 or 25, characterized in that Determining, according to the fourth measurement result and the fifth measurement result, whether to perform random access on the first resource includes: When the fourth measurement result is less than a fourth signal strength threshold, and / or the fifth measurement result is less than a fifth signal strength threshold, random access is not performed on the first resource.

27. A communication method, characterized in that: include: Acquire a first resource and a second resource, where the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, and a first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, and the time domain resource of the second resource is located in the second time domain unit, and the second resource is predefined or preconfigured.

28. The method according to claim 27, characterized in that The time domain resource of the third resource is located on the second time domain unit, and the third resource is predefined or preconfigured.

29. The method according to claim 28, characterized in that The format length of the random access preamble sent on the first resource and the second resource is greater than the format length of the random access preamble sent on the third resource; or, The first resource and the second resource support repeated transmission of a physical random access channel (PRACH), and the third resource does not support repeated transmission of the PRACH, or the maximum number of repeated transmissions supported by the first resource and the second resource is different from the maximum number of repeated transmissions supported by the third resource; or The RSRP thresholds corresponding to the first resource and the second resource used to determine the number of repetitions are greater than the RSRP threshold corresponding to the third resource used to determine the number of repetitions; or The time domain resource corresponding to the time-frequency physical random access channel opportunity RO in the first resource and the second resource is greater than the time domain resource corresponding to the RO in the third resource, or the preamble length corresponding to the first resource and the second resource is greater than the preamble length corresponding to the third resource; or The maximum transmit power on the first resource and the second resource is less than the maximum transmit power on the third resource; or, The transmission power on the first resource and the second resource is less than the transmission power on the third resource.

30. A communication method, characterized in that: include: obtaining a first measurement result; Based on the first measurement result and the first threshold, the first time-frequency physical random access channel opportunity RO or the second RO is determined, wherein the first RO is located in the first resource, the second RO is located in the second resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, the first part of the first time domain resource is located in the first time domain unit, the second part of the first time domain resource is located in the second time domain unit, the second part is the time domain resource of the second resource, and the second time domain unit is used for uplink transmission.

31. The method according to claim 30, characterized in that The method further comprises: Second information is obtained, where the second information indicates a first threshold, where the first threshold includes one or more of the following: a corresponding reference signal received power (RSRP) threshold, a path loss threshold, or a transmit power threshold.

32. The method according to claim 31, wherein Determining a first RO or a second RO according to the first measurement result and the first threshold includes one or more of the following: When the first measurement result is greater than or equal to the RSRP threshold, the first RO is located in the first resource; When the first measurement result is less than the RSRP threshold, the second RO is located in the second resource; When the first measurement result is less than or equal to the path loss threshold, the first RO is located in the first resource; When the first measurement result is greater than the path loss threshold, the second RO is located in the second resource; When the first measurement result is less than or equal to the transmit power threshold, the first RO is located in the first resource; or, When the first measurement result is greater than the transmit power threshold, the second RO is located in the second resource.

33. The method according to claim 31 or 32, characterized in that The second information indicates a frequency distance threshold; When the first RO is located in the first resource, the distance between the first RO and the second frequency point is greater than or equal to the frequency distance threshold, and the second frequency point is located in the second subband; or When the second RO is located in the second resource, the distance between the second RO and the second frequency point is less than or equal to the frequency distance threshold, and the second frequency point is located in the second sub-band.

34. A communication method, characterized in that: include: receiving first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, a first part of the first time domain resource being located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource being located in the first frequency domain unit; The first information further indicates that M frequency division multiplexing random access opportunities FDM-RO of the first resource are used for contention-based random access (CBRA), where N is greater than or equal to M, and both are positive integers; and / or, The first information further indicates that K FDM-ROs out of the N FDM-ROs of the first resource are used for contention-free random access CFRA, where K is a positive integer less than or equal to N; Determine CBRA on the M FDM-ROs and / or CFRA on the K FDM-ROs according to the first information.

35. A communication method, characterized in that: include: Determine first information, where the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource is located in the first frequency domain unit; The first information further indicates that M frequency division multiplexing random access opportunities FDM-RO of the first resource are used for contention-based random access (CBRA), where N is greater than or equal to M, and both are positive integers; and / or, The first information further indicates that K FDM-ROs out of the N FDM-ROs of the first resource are used for contention-free random access CFRA, where K is a positive integer less than or equal to N; The first information is sent.

36. The method according to claim 35, characterized in that The M FDM-ROs are the ROs farthest from the second subband among the N FDM-ROs, and the sum of the distances between the M FDM-ROs and the second subband is the minimum value of the sum of the distances between any M FDM-ROs among the N FDM-ROs and the second subband.

37. A communication method, characterized in that: include: receiving first information indicating a first resource, the first resource including a first time domain resource and a first frequency domain resource, the first time domain resource corresponding to the first frequency domain resource, the first time domain resource being located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit including a first subband for uplink transmission and a second subband for downlink transmission, and the first frequency domain resource being located in the first subband; Acquire a first measurement resource, where the first measurement resource includes a second time domain resource and a second frequency domain resource, the second time domain resource corresponds to the second frequency domain resource, the second time domain resource is located in the first time domain unit, and the second frequency domain resource is located in the second subband; Measuring signal strength on the first measurement resource to obtain a first measurement result; Determine whether to perform random access on the first resource according to the first measurement result.

38. A communication method, characterized in that: include: Receive first information, where the first information indicates a first resource, the first resource includes a first time domain resource and a first frequency domain resource, the first time domain resource corresponds to the first frequency domain resource, a first part of the first time domain resource is located in a first time domain unit, a first frequency domain unit corresponding to the first time domain unit includes a first subband for uplink transmission and a second subband for downlink transmission, the first frequency domain resource is located in the first frequency domain unit, a second part of the first time domain resource is located in a second time domain unit, the second part is a time domain resource of the second resource, the second time domain unit is used only for uplink transmission, and the first information further indicates whether random access is performed on the first resource; Random access or non-random access is performed on the first resource according to the first information.

39. A communication device, characterized in that: The communication device is a first device, configured to implement the method as described in any one of claims 1, 3-34, 37-38.

40. The communication device according to claim 39, wherein: The first device includes any one of the following: a terminal device or a chip.

41. A communication device, characterized in that The communication device is a second device, configured to implement the method as described in any one of claims 2-10, 35-36.

42. The communication device according to claim 41, wherein: The second device includes any one of the following: a network device, a chip, a central unit CU or a distributed unit DU.

43. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program or instructions, and when the computer program or instructions are executed, the method according to any one of claims 1 to 38 is implemented.

44. A computer program product, characterized in that The invention comprises instructions, which, when executed on a computer, enable the method according to any one of claims 1 to 38 to be implemented.

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