METHOD OF INDICATING COMBINATION OF RESOURCE UNITS AND COMMUNICATIONS APPARATUS.

Abstract

This application provides a method for indicating the combination of resource units and a communications apparatus. The method includes: determining a physical layer protocol data unit (PPDU), where the PPDU includes a signal field, the signal field includes a resource unit allocation subfield and a combination indication corresponding to the resource unit allocation subfield, the resource unit allocation subfield indicates a plurality of resource units, and the combination indication indicates combination information for the plurality of resource units; and sending the PPDU. The method provided in this application can help one or more users transmit data using a plurality of contiguous or non-contiguous resource units and indicate the combination status of the plurality of resource units to the user. This improves the resource allocation flexibility of a system and enhances the system's spectrum utilization.

Description

METHOD FOR INDICATING THE COMBINATION OF RESOURCE UNITS AND COMMUNICATIONS APPARATUS ML / í UO Jó This application claims priority from Chinese patent application no. 202010028036.6, filed with the National Intellectual Property Administration of China on January 10, 2020, and entitled METHOD OF INDICATING COMBINATION OF RESOURCE UNITS AND COMMUNICATIONS APPARATUS, which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communications and, more specifically, to a method of indicating the combination of resource units and a communications apparatus. BACKGROUND OF THE INVENTION With the evolution of 802.11 standards for wireless local area networks (WLANs), the 802.11 standards need further improvement in resource allocation. In user frequency band resource allocation, a user's frequency band resource is allocated in the form of a Resource Unit (RU). For example, a 20 MHz channel in 802.11ax might include multiple RUs, such as 26-tone RUs, 52-tone RUs, or 106-tone RUs. One tone represents one subcarrier. However, 802.11ax currently only supports the allocation of a single RU to one or more users, but does not support the allocation of multiple contiguous or non-contiguous RUs to one or more users for their use. This reduces the system's RU allocation flexibility and leads to low system spectrum utilization in the event of preamble perforation. BRIEF DESCRIPTION OF THE INVENTION This application provides a method for indicating the combination of resource units and a communications apparatus to help one or more users transmit data using a plurality of contiguous or non-contiguous resource units (RUs) and to indicate the combination status of the plurality of RUs to the user. This improves the flexibility of RU allocation in a system and enhances the utilization of the system's spectrum. According to the first aspect, a method for indicating the combination of resource units is provided. The method can be implemented by a sending device. For example, the sending device could be an access point (AP) or a chip embedded in the sending device. The method includes: determining a Physical Layer Protocol Data Unit (PPDU), where the PPDU includes a signal field, the signal field includes a resource unit allocation subfield and a combination indication corresponding to the resource unit allocation subfield, the resource unit allocation subfield indicates a plurality of resource units, and the combination indication provides information about the combination of the plurality of resource units; and sending the PPDU. According to the resource unit combination indication method provided in the first aspect, the combination indication in the signal field can indicate a combination status of small RUs within a 20 MHz channel, enabling one or more users to transmit data using a plurality of contiguous or non-contiguous RUs, and to indicate to the user the combination status of the plurality of RUs. This improves the flexibility of RU allocation in a system and enhances the utilization of the system's spectrum. According to a second aspect, a method for indicating the combination of resource units is provided. The method can be implemented by a receiving device. For example, the receiving device could be an STA or a chip applied to the receiving device. The method includes: receiving a Physical Layer Protocol Data Unit (PPDU), where the PPDU includes a signal field, the signal field includes a resource unit allocation subfield and a combination indication corresponding to the resource unit allocation subfield, the resource unit allocation subfield indicates a plurality of resource units, and the combination indication indicates combination information for the plurality of resource units; and determining the combination information for the plurality of resource units based on the PPDU. According to the resource unit combination indication method provided in the second aspect, the combination indication in the signal field can show a user a combination status of small RUs within a 20 MHz channel, to support one or more users in data transmission using a plurality of contiguous or non-contiguous RUs. This improves the flexibility of RU allocation in a system and enhances the utilization of the system's spectrum. In a possible implementation of the first aspect or the second aspect, the small-sized RUs within the 20 MHz channel include a 26-tone RU, a 52-tone RU, and a 106-tone RU. In a possible implementation of the first or second aspect, the small RUs are not combined in the 20 MHz channel. In a possible implementation of the first or second aspect, combining small RUs includes: combining a 26-tone RU and a 52-tone RU into a multiple RU, combining a 26-tone RU and a 106-tone RU into a multiple RU, or combining a 52-tone RU and a 106-tone RU into a multiple RU. In a possible implementation of the first aspect or the second aspect, for the combination of small-sized RUs, the locations of the 26-tone RU, the 52-tone RU, and the 106-tone RU that are to be combined are not limited. In a possible implementation of the first or second aspect, the combination indication is included in the resource unit allocation subfield; or the signal field further includes a multiple resource unit allocation field, and the multiple resource unit allocation field includes the combination indication. In a possible implementation of the first or second aspect, the signal field can be an HE-SIG-B field, an EHT-SIG field, or an 802.11 signal field in a future network system. In a possible implementation of the first or second aspect, the combination indication includes ? bits, the combination indication indicates a quantity of multiple RUs obtained by combining the plurality of resource units, and a multiple RU is formed by combining at least two resource units into the plurality of resource units. In a possible implementation of the first or second aspect, when there is a multiple RU, the multiple RU is formed by combining a 26-tone RU and a 52-tone RU, combining a 26-tone RU and a 106-tone RU, or combining a 52-tone RU and a 106-tone RU; When there are two multiple RUs, in the two multiple RUs, one multiple RU is formed by combining a 26-tone RU and a 52-tone RU, and the other multiple RU is formed by combining a 26-tone RU and a 106-tone RU; or each of the two multiple RUs is formed by combining a 26-tone RU and a 52-tone RU; or when there are three multiple RUs, each of the three multiple RUs is formed by combining a 26-tone RU and a 52-tone RU. In a possible implementation of the first aspect or the second aspect, the combination indication includes 1 bit; a first value of the combination indication indicates that the plurality of resource units are not combined, and a second value of the combination indication indicates that at least two RUs in the plurality of resource units are combined into a multiple RU. Optionally, when at least two RUs in the plurality of resource units are combined into the multiple RU, the multiple RU is formed by combining a 56-tone RU and a neighboring 26-tone RU, the multiple RU is formed by combining a 106-tone RU and a neighboring 26-tone RU, or the multiple RU is formed by combining a 106-tone RU and a 52-tone RU. In a possible implementation of the first or second aspect, a first value of the combination indication indicates that the plurality of resource units are not ML / t / ZUZZ / U í UO Jó combined; a second value of the combination indication indicates that a first RU of 52 tones or a first RU of 106 tones in the plurality of resource units is combined with a neighboring RU of 26 tones; a third value of the combination indication indicates that a second RU of 106 tones in the plurality of resource units is combined with a neighboring RU of 26 tones; and a fourth value of the combination indication indicates that a third RU of 52 tones in the plurality of resource units is combined with a neighboring RU of 26 tones. According to a third aspect, a method for indicating the combination of resource units is provided. This method can be implemented by a sending device. For example, the sending device could be an access point (AP), or it could be a chip embedded in the sending device.The method includes: determining a physical layer protocol data unit PPDU, where the PPDU includes a signal field, the signal field includes a plurality of resource unit allocation subfields and a plurality of combination indications, the plurality of resource unit allocation subfields indicate a plurality of resource units, the plurality of combination indications indicates combination information of the plurality of resource units, a combination indication corresponds to a RU indicated by a resource unit allocation subfield, and a resource unit is a 242-tone RU, a 484-tone RU, or a 996-tone RU; and sending the PPDU. According to the resource unit combination indication method provided in the third aspect, the combination indication in the signal field can indicate a combination status of large RUs within a 242-tone RU. This allows one or more users to transmit data using a plurality of contiguous or non-contiguous large RUs and indicates the combination status of the plurality of large RUs to the user. This improves the flexibility of RU allocation within a system and enhances system spectrum utilization in the event of a preamble perforation. According to a fourth aspect, a method for indicating the combination of resource units is provided. The method can be implemented by a receiving device. For example, the receiving device can be an STA or a chip applied to the receiving device. The method includes: receiving a Physical Layer Protocol Data Unit (PPDU), where the PPDU includes a signal field, the signal field includes a plurality of resource unit allocation subfields and a plurality of combination indications, the plurality of resource unit allocation subfields indicate a plurality of resource units, the plurality of combination indications indicates combination information for the plurality of resource units, a ML / t / ZUZZ / U í UO Jó combination indication corresponds to a RU indicated by a resource unit allocation subfield, and a resource unit is a 242-tone RU, a 484-tone RU, or a 996-tone RU; and determine the combination information of the plurality of resource units based on the PPDU. According to the resource unit combination indication method provided in the fourth aspect, the combination indication received in the signal field can be used to determine the combination status of large RUs within a 242-tone RU. This allows one or more users to transmit data using a plurality of contiguous or non-contiguous large RUs. This improves the flexibility of RU allocation within a system and enhances system spectrum utilization in the event of preamble perforation. In a possible implementation of the third aspect or the fourth aspect, the signal field may be an HE-SIG-B field, an EHT-SIG field, or an 802.11 signal field in a future network system. In a possible implementation of the third or fourth aspect, the combination indication is included in the corresponding resource unit allocation subfield; or the signal field further includes a multiple resource unit allocation field, and the multiple resource unit allocation field includes the combination plurality indication. In a possible implementation of the third aspect or the fourth aspect, a RU corresponding to the combination indication is the 242-tone RU, the 484-tone RU, or the 996-tone RU. In a possible implementation of the third or fourth aspect, a first value of the combination indication indicates that a RU corresponding to the combination indication is not combined; and at least two RUs corresponding to at least two combination indications are combined, in the plurality of combination indications, whose values ​​are all a second value. In a possible implementation of the third or fourth aspect, a first value of the combination indication indicates that a RU corresponding to the combination indication is not combined; a second value of the combination indication indicates that a RU corresponding to the combination indication and another RU are combined into a multiple RU, and the RU is an initial RU in the multiple RU; a third value of the combination indication indicates that a RU corresponding to the combination indication and another RU are combined into a multiple RU, and the RU is a central RU in the multiple RU; and a fourth value of the combination indication indicates that a RU corresponding to the combination indication ML / t / ZUZZ / U í UO Jó and another RU combine into a multiple RU, and the RU is a tail RU in the multiple RU. In a possible implementation of the third or fourth aspect, a first value of the combination indication indicates that a RU corresponding to the combination indication is not combined; and a second value of the combination indication indicates that a RU corresponding to the combination indication and another RU in a preset location are combined into a multiple RU. According to a fifth aspect, a communications apparatus is provided. The apparatus includes units configured to perform the steps in any of the first aspect or the possible implementations of the first aspect, or units configured to perform the steps in any of the third aspect or the possible implementations of the third aspect. According to a sixth aspect, a communications apparatus is provided. The apparatus includes units configured to perform the steps in any of the second aspect or possible implementations of the second aspect, or units configured to perform the steps in any of the fourth aspect or possible implementations of the fourth aspect. According to a seventh aspect, a communications apparatus is provided. The apparatus includes at least one processor and memory. The at least one processor is configured to perform the method in any of the first aspect or possible implementations of the first aspect, or is configured to perform the method in any of the third aspect or possible implementations of the third aspect. According to an eighth aspect, a communications apparatus is provided. The apparatus includes at least one processor and memory. The at least one processor is configured to perform the method in any of the second aspect or possible implementations of the second aspect, or is configured to perform the method in any of the fourth aspect or possible implementations of the fourth aspect. According to a ninth aspect, a communications apparatus is provided. The apparatus includes at least one processor and an interface circuit. The at least one processor is configured to perform the method in any of the first aspect or possible implementations of the first aspect, or is configured to perform the method in any of the third aspect or possible implementations of the third aspect. According to a tenth aspect, a communications apparatus is provided. The apparatus includes at least one processor and an interface circuit. The at least one processor is configured to perform the method in any of the second aspect or possible implementations of the second aspect, or is configured to perform the method in any of the fourth aspect or possible implementations of the fourth aspect. According to the eleventh aspect, a network device is provided. The network device includes the communications apparatus provided in the fifth aspect, the network device ML / í UO Jó includes the communications apparatus provided in the seventh aspect, or the network device includes the communications apparatus provided in the ninth aspect. According to a twelfth aspect, a terminal device is provided. The terminal device includes the communications apparatus provided in the sixth aspect, the terminal device includes the communications apparatus provided in the eighth aspect, or the terminal device includes the communications apparatus provided in the tenth aspect. According to a thirteenth aspect, a computer program product is provided. The computer program product includes a computer program. When executed by a processor, the computer program is used to implement the method in any of the first through fourth aspects or the possible implementations of the first through fourth aspects. According to a fourteenth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program. When executed, the computer program is used to perform any of the first four aspects or the method in accordance with any of the first four aspects. According to a fifteenth aspect, a communications system is provided. The communications system includes the apparatus provided in the fifth aspect and the apparatus provided in the sixth aspect; the system includes the apparatus provided in the seventh aspect and the apparatus provided in the eighth aspect; the system includes the apparatus provided in the ninth aspect and the apparatus provided in the tenth aspect; or the system includes the network device provided in the eleventh aspect and the terminal device provided in the twelfth aspect. According to a sixteenth aspect, a chip is provided. The chip includes a processor, configured to invoke a computer program from memory and execute the computer program, such that a communications device in which the chip is installed performs the method in any of the first to fourth aspects or possible implementations of the first to fourth aspects, or performs the method in any of the second aspect or possible implementations of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of a communications system applicable to an implementation of this application; Figure 2 is a schematic diagram of a HE-SIG field structure in a 20 MHz channel; ML / t / ZUZZ / U í UO Jó Figure 3 is a schematic diagram of various ways of arranging and combining resource units when the data packet bandwidth is 20 MHz; Figure 4 is a schematic diagram of various ways of arranging and combining resource units when the data packet bandwidth is 40 MHz; Figure 5 is a schematic diagram of various ways of arranging and combining resource units when the data packet bandwidth is 80 MHz; Figure 6 is a schematic diagram of a content channel structure when the data packet bandwidth is 20 MHz; Figure 7 is a schematic diagram of a content channel structure when the data packet bandwidth is 40 MHz; Figure 8 is a schematic diagram of a content channel structure when the data packet bandwidth is 80 MHz; Figure 9 is a schematic interaction diagram of a method for indicating the combination of resource units according to an implementation of this request; Figure 10 is a schematic interaction diagram of another method of indicating the combination of resource units according to an implementation of this request; Figure 11 is a schematic diagram of an example of a signal field according to this application; Figure 12 is a schematic diagram of an example of a multi-resource unit allocation field according to one implementation of this request; Figure 13 is a schematic diagram of another example of a multiple resource unit allocation field according to one implementation of this application; Figure 14 is a schematic diagram of an example of a signal field according to this application; Figure 15 is a schematic diagram of an example of determining a resource unit based on the resource unit location information according to an implementation of this request; Figure 16 is a schematic diagram of a communication apparatus according to one embodiment of this application; Figure 17 is a schematic diagram of another communication device according to one implementation of this application; Figure 18 is a schematic diagram of a communication apparatus according to one embodiment of this application; Figure 19 is a schematic diagram of another communication apparatus according to one implementation of this application; Figure 20 is a schematic diagram of a terminal device according to a ML / t / ZUZZ / U / UO JJ making this request; Figure 21 is a schematic diagram of another terminal device according to one implementation of this application; Figure 22 is a schematic diagram of a network device according to one implementation of this application; Figure 23 is a schematic diagram of various ways to combine resource units when the data packet bandwidth is 20 MHz according to one implementation of this application; and Figure 24 is a schematic diagram of various ways of combining resource units when the data packet bandwidth is 40 MHz according to one implementation of this application. DESCRIPTION OF ACHIEVEMENTS The technical solutions for this application are described below with reference to the attached drawings. The technical solutions in this application can be applied to various communication systems, such as a wireless local area network (WLAN). For example, the implementations in this application can be applied to any of the 802.11 802.11ac / 802.11ax / 802.11be protocols in the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series currently used in WLAN protocols or to future IEEE 802.11 series protocols. Figure 1 is a schematic diagram of a communications system applicable to an implementation of this application. The communications system shown in Figure 1 can be a WLAN or a wide area network. The communications system in Figure 1 can include one or more access points (APs) and one or more station stations (STAs). In Figure 1, two APs (AP 1 and AP 2) and two station stations (STAs) (STA 1 and STA 2) are used as an example. Wireless communication can be implemented between APs, between an AP and a STA, and between STAs using various standards. The solutions provided in this application can be applied to communication between APs, communication between STAs, and communication between an AP and a STA. The user station (STA) may also be called a terminal, subscriber unit, access terminal, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communications device, user agent, user apparatus, or user equipment (UE). The station can be a wireless communications chip, a wireless sensor, or a wireless communications terminal. For example, a mobile phone that supports a function of Wireless fidelity (Wi-Fi) communications; a tablet that supports a Wi-Fi communications function; a set-top box that supports a Wi-Fi communications function; a smart TV that supports a Wi-Fi communications function; a smart wearable device that supports a Wi-Fi communications function; a vehicle-mounted communications device that supports a Wi-Fi communications function; a computer that supports a Wi-Fi communications function; a smart home device, for example, a smart camera, a smart water meter, or a sensor that supports a Wi-Fi communications function; or an Internet of Vehicles device, an Internet of Things device, a sensor, or similar device that supports a Wi-Fi communications function. Optionally, the station can support an 802 standard device.11 in a current network system or in a future network system. The access point (AP) in this application is a device deployed in a wireless communications network that provides wireless communications functionality to a station and can be used as a WLAN hub. The access point (AP) may alternatively be a base station, router, gateway, repeater, communications server, switch, bridge, or similar device. The base station may include various types of macro base stations, micro base stations, repeater nodes, and the like. For ease of description, the device that provides wireless communications functionality and wireless communications service to the station is collectively referred to as an access point or AP. In this scenario, the AP can communicate with the STA using a wireless local area network, and data from the STA is transmitted to one side of the network, or vice versa. The AP is also known as a wireless access point, access point, or similar term. It is an access point used by a mobile user to access a wired network and is primarily deployed in homes, buildings, and campuses, with a typical coverage radius of tens to hundreds of meters. However, APs can also be deployed outdoors. The AP acts as a bridge connecting a wired network and a wireless network. It is mainly used to connect wireless network clients to each other and then to connect the wireless network to Ethernet. Specifically, the AP can be a terminal device or a network device with a Wi-Fi chip.Optionally, the AP can be a device compatible with the 802.11 standard in the current network system or in the future network system. Specifically, wireless communication between the AP and the STA can be established using multi-user, multiple-input, multiple-output (MU-MIMO) technology. In this implementation, each STA is equipped with one or more antennas. Each AP supports multi-site coordination and / or transmission. ΜΛ / t / ZUZZ / U í UO Jó joint. It should also be understood that Figure 1 is simply a schematic diagram. The communications system may also include other network devices or terminal devices; for example, it may also include a wireless repeater / retransmitter and a wireless backhaul device, which are not shown in Figure 1. The number of APs and STAs included in the communications system is not limited in this implementation of this application. Furthermore, aspects or features of this application may be implemented as a method, device, or product that utilizes standard programming and / or engineering technologies. The term "product" as used in this application covers a computer program that can be accessed from any computer-readable component, medium, or storage device. For example, a computer-readable medium may include, but is not limited to: a magnetic storage component (e.g., a hard disk, floppy disk, or magnetic tape), an optical disc (e.g., a compact disc (CD), a digital versatile disc (DVD), or similar), a smart card, and a flash memory component (e.g., an erasable programmable read-only memory (EPROM), a card, a stick, a key drive, or similar).In addition, the various storage media described herein may refer to one or more machine-readable devices and / or other media configured to store information. The term "machine-readable media" may include, but is not limited to, a wireless channel and various other media that can store, contain, and / or carry instructions and / or data. In terms of bandwidth configurations, the bandwidths currently supported by 802.11ax include: 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 80 + 80 MHz. One difference between 160 MHz and 80 + 80 MHz is that 160 MHz is a continuous frequency band, while two 80 MHz bands in 80 + 80 MHz can be separated. A configuration such as 320 MHz is supported by 802.11be. In user frequency band resource allocation, a user's frequency band resource is allocated in the form of a Resource Unit (RU) rather than a channel. A 20 MHz channel in 802.11ax can include a plurality of RUs in the form of 26-tone RUs, 52-tone RUs, or 106-tone RUs. A tone indicates a subcarrier. For example, a 26-tone RU indicates an RU that includes 26 subcarriers, and a 26-tone RU can be allocated to a user for their use. Alternatively, the RU can be allocated to one or more users in the form of 242 tones, 484 tones, 996 tones, or similar configurations. However, 802.11ax currently supports the allocation of a single RU to one or more users. For example, a number of MU-MIMO users that is supported by a resource unit (10⁶-tone RU) whose size is greater than or equal to 10⁶ subcarriers can ML / t / ZUZZ / U í UO Jó be less than or equal to 8. However, 802.11ax does not allow the allocation of a plurality of contiguous or non-contiguous RUs to one or more users for their use. This reduces the flexibility of RU allocation for the system and results in low utilization of the system spectrum in the event of preamble perforation. In light of this, this application provides a method for indicating the combination of resource units (RUs), to help one or more users transmit data using a plurality of contiguous or non-contiguous RUs, and to indicate the combination status of the plurality of RUs to the user. This improves the flexibility of RU allocation in a system and enhances the utilization of the system's spectrum. To describe more clearly the method provided in this application, the methods of allocation and indication of RU are first briefly described. Currently, a signal field (SIG) is primarily used to notify the user of the RU allocation. The SIG field is encoded separately in each 20 MHz channel. For example, the signal field could be a High Efficient Signal Field-B (HE-SIG-B), an Extremely High Throughput Signal Field (EHT-SIG), or a signal field in 802.11 in a future network system. The information structure of the SIG field in each 20 MHz channel is shown in Figure 2. As shown in Figure 2, the HE-SIG field is divided into two parts. The first part is a common field, which includes 1 to N resource unit (RU) allocation subfields, a 26-tone center RU indication subfield (Center 26-tone RU Indication) that exists when the bandwidth is greater than or equal to 80 MHz, a cyclic redundancy code (CRC) used for verification, and a tail subfield used for cyclic decoding. A resource unit allocation subfield corresponds to the allocation of resource units in the frequency domain of a 20 MHz channel, and a resource unit subfield indicates the size and location of one or more resource units included in the 20 MHz channel.In a station field (which may also be called a user-specific field), there are from 1 to M station fields (User Fields) based on a sequence of resource unit assignments. Typically, two of the M station fields form a group, and every two station fields are followed by a CRC and a queue field. In addition to this last group, there may be one or two station fields. In this application, the station field may also be referred to as a user field. A resource unit allocation subfield is a resource unit allocation index, and a resource unit allocation index indicates the size and the ML / UO Jó location of one or more resource units included in the 20 MHz channel. A sequence of at least one station field corresponds to a sequence of a resource unit allocation. Each station field indicates station information for an assigned STA in a RU included in the resource unit allocation. When the arrangement and combination of resource units indicated in the resource unit allocation subfield includes a resource unit that includes at least 10⁶ subcarriers, the resource unit allocation index further indicates a number of MU-MIMO users that is compatible with the resource unit that includes at least 10⁶ subcarriers. The number of MU-MIMO users is less than or equal to 8. When the bandwidth of a data packet is 20 MHz, Figure 3 is a schematic diagram of one possible way to allocate a resource unit (RU) when the data packet bandwidth is 20 MHz. The full 20 MHz bandwidth can include one complete RU (242-tone RU) containing 242 subcarriers, or it can include various combinations of a RU (26-tone RU) containing 26 subcarriers, a RU (52-tone RU) containing 52 subcarriers, and a RU (106-tone RU) containing 106 subcarriers. A tone can be understood as a subcarrier. In addition to the RUs for transmitting data, there is a guard subcarrier, a null subcarrier, and a direct current (DC) subcarrier. When the data packet bandwidth is 40 MHz, Figure 4 shows various ways to allocate a resource unit (RU). The total bandwidth is approximately equivalent to a replica of the subcarrier distribution of the 20 MHz bandwidth. The full 40 MHz bandwidth can include a complete RU (484-tone RU) comprising 484 subcarriers, or it can include various combinations of a 26-tone RU, a 52-tone RU, a 106-tone RU, and a 242-tone RU. When the data packet bandwidth is 80 MHz, Figure 5 is a schematic diagram of one possible resource unit allocation form. The total bandwidth is approximately equivalent to a replica of the subcarrier distribution of the 20 MHz bandwidth. The full 80 MHz bandwidth can include a single resource unit (996-tone RU) comprising 996 subcarriers, or it can include various combinations of a 484-tone RU, a 242-tone RU, a 106-tone RU, a 52-tone RU, and a 26-tone RU. Additionally, there is a central 26-tone RU comprising two 13-tone subunits located within the entire 80 MHz bandwidth. ML / í UO Jó Similarly, when the data packet bandwidth is 160 MHz, the entire bandwidth can be considered a replica of the subcarrier distribution of two 80 MHz bandwidths. The full bandwidth can include a complete RU of 2 * 996 tones (i.e., a resource unit that includes 1992 subcarriers) or it can include various combinations of a 26-tone RU, a 52-tone RU, a 106-tone RU, a 242-tone RU, a 484-tone RU, and a 996-tone RU. In addition, there is a central 26-tone RU that includes two 13-tone subunits in the middle of the entire 80 MHz bandwidth. In the subcarrier distribution methods described above, based on the 242-tone RU, a left-hand 242-tone RU can be considered the lowest frequency in the data packet bandwidth, and a right-hand 242-tone RU can be considered the highest frequency. Figure 6 is used as an example. In this case, the 242-tone RUs can be numbered sequentially 1, 2, 3, and 4 from left to right. For another example, when the data packet bandwidth is 160 MHz, the 242-tone RUs can be numbered sequentially 1, 2, ..., and 8 from left to right. It should be understood that in a data field, the eight 242-tone RUs correspond one-to-one with eight 20 MHz channels in ascending frequency order. However, because there is a central 26-tone RU, the eight 242-tone RUs and the eight 20 MHz channels do not completely overlap in frequency. A content channel (CC) concept is introduced in 802.11ax. The content channel can be understood as the content included in the SIG-B field. For example, the content channel may include at least one resource unit allocation subfield (RU allocation subfield), a plurality of fields per station, the CRC used for verification, and the tail subfield used for cyclic decoding. Figure 6 is a schematic diagram of a content channel structure when the data packet bandwidth is 20 MHz. As shown in Figure 6, when the data packet bandwidth is only 20 MHz, the SIG-B field includes only one content channel. The content channel includes a resource unit allocation subfield that indicates a resource unit allocation within the first 242 tones of a data portion.The resource unit allocation subfield is a resource unit allocation index and can be used to indicate all possible resource unit allocation methods in a 242-tone RU. Additionally, the index indicates the number of users required to perform SU / MU-MIMO transmission in a RU whose size is greater than or equal to a 106-tone RU (i.e., a RU that includes at least 106 subcarriers). For example, the resource unit allocation subfield is supposed to be a ML / í UO Jó 8-bit index. All possible ways of allocating resource units in the 242-tone RU can be indicated using the 8-bit index. Furthermore, the 8-bit index indicates the number of users for SU / MU-MIMO transmission in a RU whose size is greater than or equal to the 106-tone RU (i.e., the RU that includes at least 106 subcarriers). Table 1 shows a table of resource unit indices for the 8-bit index. Table 1 8-bit index (B7 B6 B5 B4 B3 B2 B1 B0) #1 #2 #3 #4 #5 #6 #7 #8 #9 Number of entries 00000000 26 26 26 26 26 26 26 26 26 1 00000001 26 26 26 26 26 26 26 52 1 00000010 26 26 26 26 26 52 26 26 1 00000011 26 26 26 26 26 52 52 1 00000100 26 26 52 26 26 26 26 26 1 00000101 26 26 52 26 26 26 52 1 00000110 26 26 52 26 52 26 26 1 00000111 26 26 52 26 52 52 1 00001000 52 26 26 26 26 26 26 26 1 00001001 52 26 26 26 26 26 52 1 00001010 52 26 26 26 52 26 26 1 00001011 52 26 26 26 52 52 1 00001100 52 52 26 26 26 26 26 1 00001101 52 52 26 26 26 52 1 00001110 52 52 26 52 26 26 1 00001111 52 52 26 52 52 1 OOOWyzyi i 52 52 - 106 8 00011 y2yi i 106 - 52 52 8 00100y2yi 26 26 26 26 26 106 8 8-bit index (B7 B6 B5 B4 B3 B2 B1 B0) #1 #2 #3 #4 #5 #6 #7 #8 #9 Number of entries i OOIOlysyi i 26 26 52 26 106 8 00110y2yi i 52 26 26 26 106 8 00111y2yi i 52 52 26 106 8 01000y2yi i 106 26 26 26 26 26 8 01001y2yi i 106 26 26 26 52 8 01010y2yi i 106 26 52 26 26 8 01011 y2yi i 106 26 52 52 8 O11Oyiyoz 1ZO 106 - 106 16 01110000 52 52 - 52 52 1 01110001 Empty 242-tone subcarrier resource unit (empty 242-tone RU) 1 01110010 484-tone RU with zero user fields indicated in this HE-SIG-B content channel resource unit allocation subfield (484-tone RU with zero user fields indicated in this HE-SIG-B content channel RU allocation subfield) 1 01110011 996-tone RU with zero user fields indicated in this HE-SIG-B content channel resource unit allocation subfield (996-tone RU with zero user fields indicated in this RU allocation subfield of the 1 8 bit index (B7 B6 B5 B4 B3 B2 Β1 B0) #1 #2 #3 #4 #5 #6 #7 #8 #9 Container channel entry capacity HE-SIG-B) 011101xiX 0 Reserved (Reserved) 4 01111 y2yi yo Reserved (Reserved) 4 1Oy2yiyoz2 Z1Z0 106 26 106 64 11000y2yi yo 242 8 11001 y2yi yo 484 8 11010y2yi yo 996 8 11011y2yi yo Reservado (Reserved) 8 111X4X3X2X 1X0 Reserved (Reserved) 32 ΜΛ / t / ZUZZ / U / UO JJ In Table 1, the first column indicates the 8-bit index, and the intermediate columns #1 through #9 indicate different resource units. A number in a cell indicates the quantity of subcarriers included in the resource unit. For example, the index OO111y2yiyo indicates that the entire 242-tone RU is divided into four RUs: a 52-tone RU, a 52-tone RU, a 26-tone RU, and a 106-tone RU. A number of entries in a third column indicates the number of entries assigned to the same resource unit; that is, different index values ​​correspond to the same arrangement of resource units. For the index OO111y2yiyo, there are eight entries because when indicating a form of allocation of resource units of the 242-tone RU, y2yiyo also indicates a number of users, to perform SU / MU-MIMO transmission, included in the 106-tone RU, where the number corresponds to one to eight users.In other words, 3 bits y2yiyo indicates one to eight users supported on the 106-tone RU. The eight entries can be considered as eight independent rows in the table. The eight rows correspond to the same resource unit allocation method, and each row corresponds to a different number of users supported by the 106-tone RU. The 802.11ax standard specifies that MU-MIMO can be implemented on a RU that includes at least 106 subcarriers. Therefore, when there is a RU that includes at least 106 consecutive subcarriers in Table 2, the number of entries is greater than 1. Consequently, the station information for the STAs allocated within a 242-tone RU range is indicated in the "per station" field based on a sequence of resource allocations. Most of the RU configurations shown in Table 1 are within the 242-tone RU range. Additionally, some RU configurations indicate that the RU belongs to a 242-tone, 484-tone, or 996-tone RU. Each 8-bit resource unit allocation subfield reports an RU allocation status within a corresponding 20 MHz channel range. A bandwidth of 20 MHz corresponds to one resource unit allocation subfield, 40 MHz to two, 80 MHz to four, 160 MHz to eight, and 320 MHz to 16. Figure 7 is a schematic diagram of a content channel structure when the data packet bandwidth is 40 MHz. As shown in Figure 7, when the data packet bandwidth is 40 MHz, there are two SIG-B content channels: CC 1 and CC 2. The first SIG-B channel, CC 1, includes a resource unit allocation subfield and a corresponding per-station field within a first RU of 242 tones. The second HE-SIG-B channel, CC 2, also includes a resource unit allocation subfield and a corresponding per-station field within a second RU of 242 tones. Figure 8 is a schematic diagram of a content channel structure when the data packet bandwidth is 80 MHz. As shown in Figure 8, when the data packet bandwidth is 80 MHz, there are still two CCs and a total of four channels. Therefore, resource unit allocation information is indicated on all four channels based on a CC 1, CC 2, CC 1, and CC 2 structure in ascending frequency order. CC 1 includes resource unit allocation subfields in the ranges of a first 242-tone RU and a third 242-tone RU, and corresponding per-station fields in the ranges of the first 242-tone RU and the third 242-tone RU. CC 2 includes resource unit allocation subfields in the ranges of a second 242-tone RU and a fourth 242-tone RU and corresponding fields per station in the ranges of the second 242-tone RU and the fourth 242-tone RU.In addition, each of the two CCs includes a 26-tone RU indication field centered on the 80 MHz bandwidth, to indicate whether the resource unit is being used to transmit data. Similarly, when the data packet bandwidth is 160 MHz, there are still two CCs and eight channels in total. This is equivalent to further expansion based on the 80 MHz bandwidth. In this implementation of this application, the combination of different RUs can be supported, and the RU combination information can be communicated to the user equipment using a signal field. For example, the signal field can be a Signal Field B, an Extremely High Performance Signal Field (EHT-SIG), a signal field included within an EHT-SIG field, an EHT-SIG-B field, or another field included within a Physical Layer Protocol Data Unit (PPDU). This is not limited in this application. The following describes some possible RU combination states provided in this implementation of this application. For ease of description, there are two types of RUs: a small-size RU and a large-size RU. A set of small-size RUs is {26, 52, 106} and a set of large-size RUs is {242, 484, 996}. A number in the set indicates the quantity of subcarriers that make up the RU. Optionally, in this execution of this request, the following RU combination rule can be established: 1: A small UK and a large UK do not combine; 2: Small RUs do not combine into a 20 MHz channel; and 3: The combination of small-sized RUs must be continuous and, optionally, can be discontinuous. In this implementation of this application, a plurality of contiguous or non-contiguous RUs are combined into a multi-RU. The plurality of contiguous or non-contiguous RUs forming the multi-RU can be assigned to one or more users. Optionally, the plurality of contiguous or non-contiguous RUs can be defined in 802.11ax, and the number of RUs combined is not limited. For example, the combination of two small RUs within the 20 MHz channel in this implementation of this application can also be understood as combining two small RUs into a multi-RU. Based on the rule above, for the combination of small-sized RUs in the 20 MHz channel, the possible combination forms of the small-sized RUs include: one form of (52-tone RU + 26-tone RU), one form of (106-tone RU + 26-tone RU) ML / t / ZUZZ / U í UO JJ tones) and a form of (52-tone RU + 106-tone RU). In other words, there can be three types of multiple RUs included in the 20 MHz channel. A first-type multiple RU is formed by combining a 52-tone RU and a 26-tone RU. A second-type multiple RU is formed by combining a 106-tone RU and a 26-tone RU. A third-type multiple RU is formed by combining a 52-tone RU and a 106-tone RU. Furthermore, in this implementation of this application, on the 20 MHz channel, during the allocation of resource units in the frequency domain, indicated by a RU allocation subfield, any of the three types of multiple RUs mentioned above may exist, or both the first-type multiple RU and the second-type multiple RU may exist. Moreover, the number of times a first-type multiple RU (or a number of first-type multiple RUs) exists is not limited. For example, one or more first-type multiple RUs may exist. For example, it is assumed that in one allocation form of resource units in the frequency domain, indicated by a RU allocation subfield, two 52-tone RUs and at least two 26-tone RUs are included. In the allocation form of the frequency-domain resource units, two first-type multiple RUs may be included.A first-type multiple RU is formed by combining a 52-tone RU and a 26-tone RU, and the other first-type multiple RU is formed by combining the other 52-tone RU and another 26-tone RU. For example, Table 2 shows one possible way to combine small RU sizes within the 20 MHz channel. Table 2 ML / t / ZUZZ / U í UO Jó #1 #2 #3 #4 #5 #6 #7 #8 #9 Number of entries (Number of cools) 26 26 26 26 26 26 26 52 (A) 1 26 26 26 26 26 52 (A) 26 26 1 26 26 26 26 26 52 (A, o) 52 (B, o) 1 26 26 52 (A) 26 26 26 26 26 1 26 26 52 (A, o) 26 26 26 52 (B, o) 1 26 26 52 (A, o) 26 52 (B, o) 26 26 1 26 26 52 (A, o) 26 52 (B, o) 52 (C, o) 1 #1 #2 #3 #4 #5 #6 #7 #8 #9 Number of entries (Number of entries) 52 (A) 26 26 26 26 26 26 26 1 52 (A, o) 26 26 26 26 26 52 (B, o) 1 52 (A, o) 26 26 26 52 (B, o) 26 26 1 52 (A, o) 26 26 26 52 (B, o) 52 (C, o) 1 52 (A, o) 52 (B, o) 26 26 26 26 26 1 52 (A, o) 52 (B, o) 26 26 26 52 (C, o) 1 52 (A, o) 52 (B, o) 26 52 (C, o) 26 26 1 52 (A) 52 26 52 52 1 52 52 - 106 (D) 8 106 (D) - 52 52 8 26 26 26 26 26 106(E) 8 26 26 52 (A, o) 26 106 (EoD, o) 8 52 (A, o) 26 26 26 106 (E, o) 8 52 (A, o) 52 26 106 (EoD, o) 8 106(E) 26 26 26 26 26 8 106 (EoD, o) 26 26 26 52 (A, o) 8 106 (EoD, o) 26 52 (A, o) 26 26 8 106 (EoD, o) 26 52 (A, o) 52 8 106 (E) 26 106 64 In Table 2, A indicates that there is one first-type multiple RU in the 20 MHz channel, that is, a 52-tone RU and a 26-tone RU are combined. B indicates that there are two first-type multiple RUs in the 20 MHz channel, that is, a 52-tone RU and a 26-tone RU are combined, and another 52-tone RU and another 26-tone RU are combined. C indicates that there are three first-type multiple RUs in the 20 MHz channel, that is, a 52-tone RU and a 26-tone RU are combined, another 52-tone RU and another 26-tone RU are combined, and yet another 52-tone RU and another 26-tone RU are combined. D indicates that there is one multiple RU ML / t / ZUZZ / Uí UO JJ of the third type in the 20 MHz channel, that is, a 106-tone RU and a 56-tone RU are combined. It indicates that there is a second-type multiple RU in the 20 MHz channel, that is, a 106-tone RU and a 26-tone RU are combined. The table indicates that in a given resource unit allocation form, only one of the corresponding A to E can appear. For example, when the resource unit allocation form is: a 52-tone RU, a 26-tone RU, a 26-tone RU, a 26-tone RU, a 26-tone RU, a 26-tone RU, and a 52-tone RU, (A, o) after the first 52-tone RU and (B, o) after the second 52-tone RU indicate that in this resource unit allocation form, the following multiple RU case can exist: A first-type multiple RU is formed by combining any 26-tone RU and either of the two 52-tone RUs. In other words, there is one first-kind multiple RU, and this is a form of combination A. Alternatively, one first-kind multiple RU is formed by combining the first 52-tone RU and any 26-tone RU, and the other first-kind multiple RU is formed by combining the second 52-tone RU and any other 26-tone RU.In other words, there are two multiple RUs of the first kind, and this is a form of combination B. For another example, when the resource unit allocation form is: one 52-tone RU, one 52-tone RU, one 26-tone RU, and one 106-tone RU, (A, o) after the first 52-tone RU and (E or D, o) after the 106-tone RU indicate that in this resource unit allocation form, the following case of a multiple RU can occur: A first-type multiple RU is formed by combining one 26-tone RU and either of the two 52-tone RUs. In other words, there is a first-type multiple RU, and this is a combination form A. Alternatively, a third-type multiple RU is formed by combining one 106-tone RU and either of the two 52-tone RUs. In other words, there is a third-type multiple RU, and this is a type D combination. Alternatively, a second-type multiple RU is formed by combining a 106-tone RU and a 26-tone RU. In other words, there is a second-type multiple RU, and this is a type E combination. It should be understood that, in this implementation of this application, the locations of the 52-tone RU, the 106-tone RU, and the 26-tone RU in the above combination forms are not limited in the first-kind multiple RU, the second-kind multiple RU, and the third-kind multiple RU. In other words, combination form A above simply indicates that there is one first-kind multiple RU (a 52-tone RU + a 26-tone RU) in the corresponding RU allocation, and the locations of a 26-tone RU and a 52-tone RU are not limited. Combination form B above simply indicates that there are two first-kind multiple RUs (a 52-tone RU + a 26-tone RU) and (a 52-tone RU + a 26-tone RU), and the locations of the 26-tone RUs and the 52-tone RUs being combined are also not limited. Similarly, the previous combination form D simply indicates that ML / t / ZUZZ / U í UO JJ there is a third-type multiple RU (a 106-tone RU + a 52-tone RU) in the corresponding RU allocation, and the locations of a 106-tone RU and a 52-tone RU that combine are also not limited. The combination form above E simply indicates that there is a second-type multiple RU (a 106-tone RU + a 26-tone RU) in the corresponding RU allocation, and the locations of a 106-tone RU and a 26-tone RU that combine are also not limited. In other words, a small-sized RU combination form shown in Table 2 is an unlimited combination form, and the locations of a 106-tone RU, a 26-tone RU, and a 52-tone RU that combine are not limited. Optionally, in some possible implementations of this application, when each combinable 52-tone or 106-tone RU is combined with a 26-tone RU, the following principle may be followed: The 52-tone or 106-tone RU may be combined, within the 20 MHz channel, with a 26-tone RU that is closest to the 52-tone or 106-tone RU. For example, a right-hand 26-tone RU may be preferred when the distance is the same, or a left-hand 26-tone RU may be preferred when the distance is the same. Alternatively, a 26-tone left or right RU is preferably combined into a range of a 106-tone left RU or a 52-tone left RU when the distance is the same, and a 26-tone right or left RU is preferably combined into a range of a 106-tone right RU or a 52-tone right RU when the distance is the same.For example, for a multiple RU of the first kind (a 52-tone RU + a 26-tone RU), the multiple RU of the first kind can be formed by combining a left or right 26-tone RU that is contiguous to a 52-tone RU with the 52-tone RU. For a multiple RU of the second kind (a 106-tone RU + a 26-tone RU), the multiple RU of the second kind can be formed by combining a left or right 26-tone RU that is contiguous to a 106-tone RU with the 106-tone RU. For a multiple RU of the third kind (a 106-tone RU + a 52-tone RU), the multiple RU of the third kind can be formed by combining a left or right 52-tone RU that is contiguous (or closest) to a 106-tone RU with the 106-tone RU. In other words, the above form of combination of small-sized RUs is a limited form of combination, and the locations of a 106-tone RU, a 26-tone RU, and a 52-tone RU that are combined are limited to a certain extent. For example, Table 3 shows another possible way of combining small RU sizes within the 20 MHz channel according to this implementation of this application. ML / í UO Jó Table 3 #1 #2 #3 #4 #5 #6 #7 #8 #9 26 26 26 26 26 26 26 (a) 52 (a) 26 26 26 26 26 52 (a) 26 (a) 26 26 26 (a) 52 (a) 26 26 26 26 26 26 26 (a) 52 (a) 26 26 26 (b) 52 (b) 26 26 (a) 52 (a) 26 52 (b) 26 (b) 26 26 26 (a) 52 (a) 26 52 52 52 (a) 26 (a) 26 26 26 26 26 26 52 (a) 26 (a) 26 26 26 26 (b) 52 (b) 52 (a) 26 (a) 26 26 52 (b) 26 (b) 26 52 (a) 26 (a) 26 26 (b) 52 (b) 52 (C, o) 52 52 (a) 26 (a) 26 26 26 26 52 52 (a) 26 (a) 26 26 (b) 52 (b) 52 52 (a) 26 (a) 52 (b) 26 (b) 26 52 52 (a) 26 (a) 52 52 26 26 26 26 26 (a) 106 (a) 26 26 (a) 52 (a) 26 (b) 106 (b) 52 (a) 26 (a) 26 26 (b) 106 (b) 52 52 26 (a) 106 (a) 106 (a 26 (a) 26 26 26 26 106 (a 26 (a) 26 26 (b) 52 (b) 106 (a 26 (a) 52 (b) 26 (b) 26 106 (a 26 (a) 52 52 106 (a 26 (a) 106 26 (a) 106 (a) In Table 3, for the distribution of subcarriers in any row, a multiple RU can be obtained by combining the RUs numbered (a), and a multiple RU can be obtained by combining the RUs numbered (b). Furthermore, in the same RU assignment, a combination of RUs in the form (a) and a combination of RUs in the form (b) can coexist. For another example, Table 4 shows another possible combination of a 52-tone RU and a 106-tone RU within the 20 MHz channel according to this implementation of this application. ML / í UO Jó Table 4 #1 #2 #3 #4 #5 #6 #7 #8 #9 26 26 52 (c) 26 106 (c) 52 (c) 26 26 26 106 (c) 52 (c) 52 26 106 (c) 52 52 (c) 26 106 (c) 106 (c) 26 26 26 52 (c) 106 (c) 26 52 (c) 26 26 106 (c) 26 52 (c) 52 106 (c) 26 52 52 (c) ML / t / ZUZZ / U í UO JJ In Table 4, for the distribution of subcarriers in any row, a multiple RU can be obtained by combining the numbered RUs (c). It should be understood that, in this implementation of this application, there may be another possible way to combine small RUs within the 20 MHz channel. Tables 2 through 4 list some possible RU combinations as examples. However, no limitation should be imposed on the way small RUs can be combined within the 20 MHz channel in this implementation of this application. It should also be understood that Table 3 and Table 4 show limited ways of combining small-sized RUs. For a combination of large RUs, the following examples illustrate bandwidths of 80 MHz, 160 MHz, and 320 MHz. Combining large RUs into a 242-tone RU in this embodiment of the application can also be understood as combining a plurality of large RUs into a multiple RU. If a preamble perforation occurs on a channel, the large RU combination method can be used to combine a plurality of unperforated RUs and allocate the combined plurality of RUs to one or more users. This improves RU allocation flexibility and spectrum utilization. In one possible RU combination form with an 80 MHz bandwidth shown in Table 5, the 80 MHz bandwidth corresponds to four resource unit allocation subfields, and one resource unit allocation subfield indicates a 242-tone RU. The four resource unit allocation subfields are sequentially arranged into two CCs in sequence. The locations in Table 5 indicate the sequential locations of four 242-tone RUs as indicated by the four resource unit allocation subfields. As shown in Table 5, the different combination forms separately indicate that two corresponding large RUs are combined into a multiple RU. In other words, there are five different types of multiple RUs in total included within the 80 MHz bandwidth. The different combination forms in Table 5 separately indicate different multiple RUs.It can be learned that the 80 MHz bandwidth can include two types of multiple RUs: (a 242-tone RU + a 242-tone RU) and (a 484-tone RU + a 242-tone RU). ML / t / ZUZZ / U í UO JJ Table 5 Location Combination form.. RU of 242 tones RU of 242 tones RU of 242 tones RU of 242 tones 1 RU of 242 tones RU of 242 tones 2 RU of 484 tones RU of 242 tones 3 RU of 484 tones RU of 242 tones 4 RU of 242 tones RU of 484 tones 5 RU of 242 tones RU of 484 tones Because the 160 MHz bandwidth corresponds to eight Resource Unit Allocation subfields, and one Resource Unit Allocation subfield indicates a 242-tone RU, for the 160 MHz bandwidth, there can be the following types of multiple RUs that include two or more large RUs: (one 996-tone RU + one 996-tone RU), (one 242-tone RU + one 484-tone RU), (one 242-tone RU + one 484-tone RU + one 484-tone RU), (one 242-tone RU + one 484-tone RU + one 242-tone RU), (one 484-tone RU + one 996-tone RU), and (one 996-tone RU + one 484-tone RU). Each pair of square brackets indicates a type of multiple RU. For example, Table 6 shows one possible combination of Resource Units (RUs) for the 160 MHz bandwidth provided in this implementation of the application. The 160 MHz bandwidth corresponds to eight Resource Unit Allocation subfields, with one subfield indicating a 242-tone RU. The 160 MHz bandwidth shown in Table 6 can include two 996-tone RUs. The locations in Table 6 indicate sequential locations for the two 996-tone RUs. As shown in Table 6, the different combinations separately indicate that a plurality of corresponding large RUs are combined into a single multiple RU. Table 6 ML / í UO Jó Location Combination Form One RU of 996 tones The other RU of 996 tones 1 RU of 242 tones RU of 242 tones RU of 996 tones 2 RU of 242 tones RU of 484 tones RU of 996 tones 3 RU of 484 tones RU of 242 tones RU of 996 tones 4 RU of 242 tones RU of 242 tones RU of 996 tones 5 RU of 484 tones RU of 996 tones 6 RU of 484 tones RU of 996 tones 7 RU of 484 tones RU of 242 tones RU of 242 tones RU of 484 tones It should be understood that Table 6 is merely an example and should not impose any limitations on the way in which RUs are combined within the 160 MHz bandwidth. A combination group in the 320 MHz bandwidth can be a combination based on the previous 160 MHz bandwidth, a combination based on the previous 80 MHz bandwidth, or similar. For example, Table 7 shows one possible RU combination in the 320 MHz bandwidth according to this implementation of the application. As shown in Table 7, the different combination forms indicate that two corresponding large RUs are combined into a single multiple RU. Table 7 Location Combination Form-,^ RU of 996 tones RU of 996 tones RU of 996 tones 1 RU of 996 tones RU of 996 tones 2 RU of 996 tones RU of 996 tones 3 RU of 996 tones RU of 996 tones RU of 996 tones 4 RU of 996 tones RU of 996 tones 5 RU of 996 tones RU of 996 tones RU of 996 tones 6 RU of 996 tones RU of 996 tones RU of 996 tones ML / í UO JJ It should be understood that Tables 5 through 7 are merely examples of how large RUs can be combined within a 242-tone RU in this implementation of the application, and should not impose any limitations on how large RUs can be combined within a 242-tone RU in this implementation. Furthermore, Tables 5 through 7 only show limited combinations of large RUs, and the number, locations, combinations, and other aspects of the large RUs that can be combined are all limited to a certain extent. In other words, the combinations, locations, and other aspects of the large RUs that can be combined are predefined. The following describes in detail a resource unit combination indication method provided in this application with reference to Figure 9. Figure 9 is a schematic flowchart of a resource unit combination indication method 200 according to one implementation of this application. Method 200 can be applied to the scenario shown in Figure 1. Certainly, the method can also be applied to other communication scenarios or communication systems. This is not a limitation in this implementation of the application. It should be understood that, in the following description, the methods of the implementations are described using an example in which a sending device and a receiving device are used as execution bodies to carry out the methods of the implementations. The sending device can be the AP or STA mentioned above, and the receiving device can also be the AP or STA mentioned above. As an example, but not as a limitation, the method can be implemented using chips applied to a sending device and a receiving device. As shown in Figure 9, Method 200 may include steps S210 and S220. The steps of Method 200 are described in detail below with reference to Figure 9. Method 200 includes the following steps. S210: A sending device determines a PPDU, wherein the PPDU includes a signal field, the signal field includes at least one resource unit allocation subfield and a combination indication corresponding to the at least one resource unit allocation subfield, a resource unit allocation subfield corresponds to the frequency domain resource unit allocation of a 20 MHz channel, a resource unit subfield indicates sizes and locations of a plurality of resource units included in the 20 MHz channel, the signal field further includes a combination indication, and the combination indication indicates combination information, of resource units, indicated by at least one resource unit allocation subfield.In other words, the signal field includes a resource unit allocation subfield and a combination indication corresponding to the resource unit allocation subfield; the resource unit allocation subfield indicates a plurality of resource units, and the combination indication indicates combination information for the plurality of resource units. A resource unit allocation subfield can indicate a plurality of resource units included in the frequency domain of the 20 MHz channel, and the plurality of resource units are all small-size RUs. In this case, a combination indication corresponding to a resource unit allocation subfield indicates a combination state of small-size RUs in the frequency domain of a 20 MHz channel. S220: The sending device sends the PPDU. Consequently, a receiving device receives the PPDU. Specifically, in S210, when the sending device needs to send data to the receiving device, the sending device sends the PPDU to the receiving device. The PPDU includes the Signal Field (SIG). Optionally, the Signal Field can be the EHT-SIG-B field mentioned earlier. In addition to the Signal Field, the PPDU can also include an EHT-SIG-A field, a data field, and similar fields. The Signal Field includes at least one Resource Unit allocation subfield. The Signal Field can also include at least one User Field. The resource unit allocation field corresponds to the allocation of resource units in the frequency domain of the 20 MHz channel, and the resource unit subfield indicates the sizes and locations of the plurality of resource units included in the 20 MHz channel. A sequence of at least one station field corresponds to a sequence of a resource unit allocation. Each station field indicates station information for an assigned STA in a RU included in the resource unit allocation. In addition, the signal field further includes the combination indication (or combination indication bit), and the combination indication indicates the combination information of the resource units, as indicated by at least one resource unit allocation subfield.In S220, after receiving the PPDU, the receiving device can determine the RU combination information based on the signal field and the indication bit, thus identifying a plurality of RUs corresponding to the receiving device. This improves the flexibility of RU allocation for a system and enhances the utilization of the system's spectrum. Figure 10 is a schematic interaction diagram of another example of a method for indicating the combination of resource units 300 according to this request. Method 300 may include steps S310 and S320. The steps of method 300 are described in detail below with reference to Figure 10. Method 300 includes the following steps. S310: A sending device generates a PPDU, where the PPDU includes a signal field, the signal field includes a plurality of resource unit allocation subfields and combined indications corresponding to the plurality of resource unit allocation subfields, a resource unit allocation subfield corresponds to the allocation of resource units in the frequency domain of a 20 MHz channel, a resource unit subfield indicates the size and location of a resource unit included in the 20 MHz channel, and the resource unit is a large-size RU, which is a 242-tone RU, a 484-tone RU, or a 996-tone RU. The plurality of resource unit allocation subfields indicates a plurality of resource units.The signal field also includes combination indications; a plurality of combination indications indicates combination information for a plurality of resource units, and a combination indication corresponds to a resource unit (RU) indicated by a resource unit allocation subfield. In other words, a plurality of combination indications indicates combination information for a plurality of large-sized RUs. The signal field includes a plurality of resource unit allocation subfields, and a plurality of combination indications indicates a plurality of units. ML / í UO Jó resources, the plurality of combination indications indicate the combination information of the plurality of resource units, the combination indication corresponds to the RU indicated by the resource unit allocation subfield, and the resource unit is the 242-tone RU, the 484-tone RU, or the 996-tone RU. S320: The sending device sends the PPDU. Consequently, a receiving device receives the PPDU. Specifically, in S310, when the sending device needs to send data to the receiving device, the sending device sends the PPDU to the receiving device. The PPDU includes the Signal Field (SIG). Optionally, the Signal Field can be the EHT-SIG-B field mentioned earlier. In addition to the Signal Field, the PPDU may also include an EHT-SIG-A field, a data field, and similar fields. The Signal Field includes at least one Resource Unit (RU) allocation subfield. The Signal Field may also include at least one User Field. A Resource Unit allocation subfield corresponds to the allocation of Resource Units in the frequency domain of a 20 MHz channel, and a Resource Unit subfield indicates the size and location of a large RU included in the 20 MHz channel.The large RU is the 242-tone, 484-tone, or 996-tone RU, and a sequence of at least one station field corresponds to a sequence of a resource unit allocation. Each station field indicates station information for an assigned STA within a RU included in the resource unit allocation. Furthermore, the signal field also includes the combination indication (or combination indication bit), and the combination indication indicates the combination information of the plurality of resource units specified by the plurality of resource unit allocation subfields. In other words, the combination indication indicates a combination of large RUs within a 242-tone RU.In S320, after receiving the PPDU, the receiving device can determine the combination information of the large RUs based on the signal field and the indication bit, thus identifying a plurality of large RUs corresponding to the receiving device. This improves the flexibility of RU allocation for a system and enhances the utilization of the system's spectrum. The description is provided separately below. In some possible implementations of this request, each resource unit allocation subfield can be extended. For example, the extension occurs after an existing resource unit allocation subfield, and a bit can be added after one or more existing resource unit allocation subfields to indicate combination information for the resource units specified by the allocation subfield. ML / UO Jó of resource units. For example, each resource unit allocation subfield includes a combination indication. The combination indication indicates combination information, of resource units, indicated by the resource unit allocation subfield. For example, as shown in Table 1, in this implementation of this application, the extension can be performed after an 8-bit index resource unit allocation subfield in Table 1, to extend the 8-bit index resource unit allocation subfield to 9 bits, 10 bits, or more. One or more extended bits indicate a combination state of the resource units indicated by the resource unit allocation subfield; that is, one or more extended bits are a combination indication, and the combination indication can indicate a combination of the resource units indicated by the resource unit allocation subfield, including combining small RUs within a 242-tone RU and combining large RUs within a 242-tone RU. For the combination of small-sized RUs within a 242-tone RU, it can be learned from the previous analysis that there is a maximum of three multiple RUs in a 20 MHz channel. These three multiple RUs are of the first kind; that is, there are three multiple RUs in the form of (one 52-tone RU + one 26-tone RU). Therefore, two bits can be used for the indication, so that zero to three multiple RUs can be indicated. In this way, the 8-bit index resource unit allocation subfield in Table 1 can be extended to 10 bits, where the 9th and 10th bits are the above combination indication. For example, in a possible implementation, a resource unit allocation subfield within a plurality of resource unit allocation subfields corresponds to the allocation of resource units in the frequency domain of a 20 MHz channel and the combination state of the resource units. The resource unit allocation subfield indicates the size and location of one or more resource units included in the 20 MHz channel and the combination state of the resource units. The resource unit allocation subfield includes a plurality of bits. Some bits indicate the allocation of resource units in the frequency domain of the 20 MHz channel—that is, the size and location of one or more resource units—and the other bits indicate the combination state of the resource units in the frequency domain of the 20 MHz channel.For example, the resource unit allocation subfield includes 10 bits, where the first 8 bits indicate the resource unit allocation and the last 2 bits indicate a resource unit combination state in the frequency domain of the resource unit allocation. Optionally, for a resource unit allocation method indicated by the first 8 bits, see a design in HE-SIG-B on 802.11ax. For example, see Table 1. It should certainly be noted that if the 20 MHz channel includes a Resource Unit (RU) containing at least 106 tones, because the RU containing at least 106 tones can be used for MU-MIMO transmission, some of the 8 bits may also indicate the number of users performing MU-MIMO transmission on the RU containing at least 106 tones. The last 2 bits can also be called the combination indication, and when the combination indication bits are set to 00, 01, 10, and 11, they can separately indicate different combination states. For example, when the 2 bits are set to 00, it indicates that there is no combination of multiple RUs in the Resource Unit Allocation Form (RUF), i.e., there are no multiple RUs. When the 2 bits are set to 01, it indicates that there is a multiple RU in the Resource Unit Allocation Form (RUF).The single multiple RU can be a first-type multiple RU (a 52-tone RU + a 26-tone RU), a second-type multiple RU (a 106-tone RU + a 26-tone RU), or a third-type multiple RU (a 52-tone RU + a 106-tone RU). When both bits are set to 10, it indicates that there are two multiple RUs in the resource unit allocation form. The two multiple RUs can be two first-type multiple RUs, or one first-type multiple RU and one second-type multiple RU (a 106-tone RU and a 26-tone RU). When both bits are set to 11, it indicates that there are three multiple RUs in the resource unit allocation form. All three multiple RUs are first-type multiple RUs (a 52-tone RU + a 26-tone RU). Optionally, in this implementation of this request, for a multiple RU indicated by the combination indication, small RU locations that form the multiple RU can be predefined. For example, when the 2 bits are set to 01, if the first-type multiple RU is indicated, it defaults to a resource unit allocation form where a first 52-tone RU to the left or right of the 52-tone RU (or a 26-tone RU adjacent to the 52-tone RU) are combined to form the first-type multiple RU. Similarly, if the second type multiple RU is indicated, it indicates by default that in a form of resource unit allocation, a first 106-tone RU from left to right and a first 26-tone RU to the left or right of the 106-tone RU (or a 26-tone RU adjacent to the 106-tone RU) are combined to obtain the second type multiple RU.If the third type multiple RU is indicated, it indicates by default that in a form of resource unit allocation, a first 106-tone RU from left to right and a first 52-tone RU to the left or right of the 106-tone RU (or a 52-tone RU adjacent to the 106-tone RU) are combined to obtain the third type multiple RU. When both bits are set to 10, if two first-kind multiple RUs are specified, the locations of a 52-tone RU and a 26-tone RU included in each first-kind multiple RU can be predefined. When both bits are set to 10, if one RU is specified In a multiple RU of the first type and a multiple RU of the second type (a 106-tone RU + a 26-tone RU), the locations of the RUs included in the multiple RU of the first type and the multiple RU of the second type can also be determined based on a predefined rule. For example, a 106-tone RU and a 52-tone RU are combined respectively with a 26-tone RU that is closest to the 106-tone RU and a 26-tone RU that is closest to the 52-tone RU, to obtain the multiple RU of the first type and the multiple RU of the second type. When the 2 bits are set to 11, a location of a 26-tone RU included in each of the three multiple RUs of the first type can also be determined based on the predefined rule above. In other words, in this embodiment of this request, each of the three preceding types of multiple RUs can further indicate a location relationship between two included small RUs. Specifically, the locations of two included small RUs within different types of multiple RUs can be further determined based on the different types of multiple RUs. In other words, in this embodiment of this request, in addition to indicating a number of multiple RUs in the form of resource unit allocation, the combination indication can further indicate a location relationship between two included small RUs within each multiple RU. In other words, the combination indication indicates a limited form of combination of small RUs. In some other possible implementations of this request, when the 2 bits are set to 00, it indicates that there is no combination of multiple RUs in the resource unit allocation form; that is, there are no multiple RUs. When the 2 bits are set to another value, it indicates that there is a 52-tone RU in the resource unit allocation form. For example, when the 2 bits are set to 01, it indicates that in the resource unit allocation form, a first 52-tone RU or a first 106-tone RU from the left is combined with an adjacent or neighboring 26-tone RU. When the 2 bits are set to 10, it indicates that a second 52-tone RU from the left is combined with an adjacent or neighboring 26-tone RU. When the 2 bits are set to 11, it indicates that a third 52-tone RU from the left is combined with an adjacent or neighboring 26-tone RU.The 26-tone RU adjacent to the 52-tone or 106-tone RU can be understood as the first 26-tone RU to the left or right of the 52-tone or 106-tone RU. In other words, in addition to indicating a number of multiple RUs in the form of resource unit allocation, the combination indication can also indicate a location relationship between two small RUs included within each multiple RU. For combining small RUs within a 242-tone RU, the combination indication can alternatively be 1 bit. For example, the resource unit allocation subfield includes 9 bits, where the first 8 bits indicate allocation. The ML / t / ZUZZ / Uí UO Jó resource unit allocation field has a 9-bit index, and the last bit indicates a resource unit combination state in the frequency domain of a 20 MHz channel. Specifically, the 8-bit index resource unit allocation subfield is extended to 9 bits, where the 9th bit is the previous combination indication. In this case, for example, when bit 1 is set to 0, it indicates that there is no multiple RU combination in the resource unit allocation form. When bit 1 is set to 1, it indicates that there is a multiple RU in the resource unit allocation form. The single multiple RU can be a first-type multiple RU (a 52-tone RU + a 26-tone RU), a second-type multiple RU (a 106-tone RU + a 26-tone RU), or a third-type multiple RU (a 52-tone RU + a 106-tone RU). The locations of two RUs included in a multiple RU can be predefined.For example, a first 52-tone or first 106-tone RU from the left can be combined with a 26-tone RU that is contiguous (or closest) to the first 52-tone or first 106-tone RU. In other words, in addition to indicating a number of multiple RUs in the form of resource unit allocation, the combination indication can also indicate a location relationship between two small RUs included within each multiple RU. For combining large-sized RUs across a 242-tone RU, a 2-bit combination indication can alternatively indicate three different multiple RUs. Each multiple RU includes two or more large-sized RUs. For example, the 8-bit index resource unit allocation subfield is extended to 10 bits, where the first 8 bits indicate a size, location, and the like of a resource unit, the last 2 bits indicate a combination state of the resource unit, and the 9th and 10th bits are the previous combination indication. In one possible implementation, when the two bits are set to 00, it indicates that a large RU specified by the resource unit allocation subfield is not combined, that is, it is not combined with another large RU. When the two bits are set to 01, 10, and 11, it separately indicates a different combination type than the combination type of the large RU specified by the resource unit allocation subfield. For example, Table 8 shows an example of combination types for large RUs indicated by different values ​​of the combination indicator. ML / t / ZUZZ / U / UO JJ Table 8 RU of size RU of RU RU RU RU RU of RU of RU RU large 242 of of of of 484 242 of of indicated by tones 242 242 242 996 tones tones 242 996 different tone tone tones tones tones tone subfields of sss Resource unit allocation Combination indication bit values ​​in different resource unit allocation subfields 01 00 00 01 01 11 11 00 00 ML / t / ZUZZ / U í UO Jó Each RU in the first row of Table 8 indicates a large RU (i.e., a form of RU allocation within a bandwidth) specified by a resource unit allocation subfield. The signal field is assumed to include the resource unit allocation subfield corresponding to the large RU shown in Table 8. For a combination indication in each resource unit, when the combination indication bit is set to 00, it indicates that the large RUs specified by the resource unit allocation subfield are not combined. When the combination indication bit is set to 01, it indicates a type of RU combination, and the large RUs corresponding to the combination indication bit value of 01 are combined to form a multiple RU.When the combination indicator bit is set to 11, it indicates a combination type, and the large RUs corresponding to the combination indicator bit value of 11 are combined to form a multiple RU. When the combination indicator bit is set to 10, it can also indicate a combination type, and the large RUs corresponding to the combination indicator bit value of 10 are combined to form a multiple RU. Therefore, there are two multiple RUs shown in Table 8. One multiple RU is (a 242-tone RU + a 242-tone RU + a 996-tone RU), and the other multiple RU is (a 484-tone RU + a 242-tone RU). In other words, a resource unit corresponding to another combination indicator with the same value as a combination indicator bit is combined with a resource unit corresponding to the combination indicator to form a multiple RU.It should be understood that, in Table 8, a RU of 996 tones corresponds to four RU assignment subfields, and the values ​​of the combination indications in all RU assignment subfields are the same, for example, they are all 11 or 01. A RU of 484 tones corresponds to two RU assignment subfields, and the values ​​of the combination indications in all RU assignment subfields are the same, for example, they are both 11. It should also be understood that when different values ​​of the 2-bit combination indicator indicate different types of large RU combinations, if a combination indicator corresponding to a small RU appears among combination indicators corresponding to large RUs, the combination indicator corresponding to the small RU does not affect the large RU combination. In other words, if the combination indicator corresponding to the small RU appears among the large RUs, the combination indicator corresponding to the small RU can be skipped or not read. It should be understood that, in this implementation of this application, for combining large RUs into a 242-tone RU, a number of large RUs to be combined can be predefined or configured. Furthermore, a combination group, combination form, or similar feature of large RUs can be predefined or configured. When the 2-bit combination indication indicates a combination of large RUs, it may indicate that more (for example, three or five) large RUs are combined to form a multiple RU. In other words, the combination indication may also indicate a predefined combination form of a plurality of large RUs; that is, the combination indication indicates a limited combination form of large RUs. The locations and sequences of the large RUs to be combined are limited to a certain extent.For example, a plurality of large RU combination groups that can be combined can be predefined, and the combination indication can indicate any of the plurality of large RU combination groups. In another possible implementation, different values ​​of the 2-bit combine indicator can alternatively indicate different sequences of large RUs during resource unit combination. For example, when the 2 bits are set to 00, it indicates that the large RUs indicated by the resource unit allocation subfield are not combined; and when the 2 bits are set to 01, 10, and 11, it indicates that the large RUs to be combined are located separately at the beginning, middle, and end of the combination locations. For example, Table 9 shows an example of one RU combination form indicated by a one-bit combine indicator value. Table 9 RU of size RU of RU of RU of RU of RU RU RU RU large indicated 242 242 242 242 of of of of of of by different tones tones tones tones 996 484 242 242 996 subfields of tones tone tone tone tone Resource unit allocation ssss Combination indication bit values ​​in different resource unit allocation subfields 01 00 00 10 11 01 11 00 00 In the example shown in Table 9, because there is a bit value 00 between a bit value 01 and a bit value 10, a large RU corresponding to bit value 00 can be omitted, and bits 10 and 11 are still read. When bit value 11 is read, a large RU corresponding to bit value 11 is a last large RU included in a multiple RU. A large RU corresponding to bit value 10 is a first large RU included in the multiple RU. In the example shown in Table 9, it can be determined that there are two multiple RUs. One multiple RU is (a 242-tone RU + a 242-tone RU + a 996-tone RU), and the other multiple RU is (a 484-tone RU + a 242-tone RU).It should be understood that, in Table 9, a RU of 996 tones corresponds to four RU assignment subfields, and the values ​​of the combination indications in all RU assignment subfields are the same, for example, they are all 11 or 00. You can also indicate, using the method above, that a multiple RU includes a plurality of (for example, two, four or more) large RUs. It should also be understood that when different values ​​of the 2-bit combine indicator signify different sequences of large resource units (RUs) during resource unit combination, if a combine indicator sign corresponding to a small RU appears among the large RUs, the combine indicator sign corresponding to the small RU does not affect the combination of the large RUs. In other words, if the combine indicator sign corresponding to the small RU appears among the large RUs, the combine indicator sign corresponding to the small RU can be skipped or not read. Optionally, for combining large RUs into a 242-tone RU, a 1-bit combination indication can alternatively indicate a plurality of large RUs included in a multiple RU. In other words, the 8-bit index resource unit allocation subfield is extended to 9 bits, where the first 8 bits indicate a size, location, and the like for a resource unit, and the last bit indicates the combination status of the resource unit. The 9-bit is the combination indication. For example, when the combination indication is set to 0, it indicates that a large RU specified by the resource unit allocation subfield is not combined—that is, it is not combined with another large RU. When the combination indication bit is set to 1, it indicates that a large RU specified by the resource unit allocation subfield is combined.Certainly, alternatively, when the combination indication is set to 1, it can indicate that a large RU specified by the resource unit allocation subfield is not combined, and when the combination indication is set to 0, it indicates that a large RU specified by the resource unit allocation subfield is combined. In this case, it is necessary to impose some limitations. For example, if a multiple RU is (a 242-tone RU + a 484-tone RU), the multiple RU must be within a bandwidth of 80 MHz, the plurality of RUs included in the multiple RU are a predetermined combination, and the reading sequence of the plurality of RUs is from left to right, and so on. To be specific, the combination indication can further indicate a number of large RUs included in each multiple RU and a location relationship between the plurality of large RUs.In other words, the combination indication may also indicate a predefined form of combination of the plurality of large-sized RUs. It should be understood that a combination indication, of one or more bits, included in each resource unit allocation subfield may indicate the limited combination of large RUs. Specifically, the number, locations, and combination of large RUs to be combined are limited to a certain extent. For example, a plurality of combination groups of large RUs that can be combined may be predefined, and the combination indication may indicate any of the plurality of combination groups of large RUs. For example, in the combination form shown in Table 5, for different combination forms in which RUs are combined within the 80 MHz bandwidth, only the last bit of the resource unit allocation subfield indication corresponding to a 242-tone RU and a 484-tone RU that need to be combined needs to be set to 1. In this way, a combination form of large-sized RUs can be indicated within the 80 MHz bandwidth to obtain different multiple RUs. For example, when a bandwidth is 160 MHz, as shown in Table ML / t / ZUZZ / U í UO Jó 6. A first (first column) 996-tone RU shown in Table 6 can be a primary 996-tone RU, i.e., a primary bandwidth of 80 MHz, and a second 996-tone RU (second column) can be a secondary 996-tone RU, i.e., a secondary bandwidth of 80 MHz. If a 996-tone RU to be combined is in the secondary bandwidth of 80 MHz, after reading the RU distribution in the primary bandwidth of 80 MHz, the receiving device needs to read a combine indication in a resource unit allocation subfield corresponding to the secondary 996-tone RU. If the combine indication bit is set to 0, the secondary 996-tone RU is not combined. If the combine indication bit is set to 1, the secondary 996-tone RU is combined.Two different multiple RUs can be identified: a multiple RU that includes (a 242-tone RU + a 242-tone RU + a 996-tone RU) and a multiple RU that includes (a 242-tone RU + a 242-tone RU) using this method. Furthermore, for a multiple RU that includes (a 484-tone RU + a 242-tone RU + a 242-tone RU + a 484-tone RU), because the locations of several large RUs are different, only the merge indications in resource unit allocation subfields corresponding to the several large RUs that need to be combined need to be set to 1. When a bandwidth is 320 MHz, a combination of RUs within that 320 MHz bandwidth can be a combination based on a 996-tone RU. For example, by reading that the combination indication bits in the resource unit allocation subfields corresponding to three 996-tone RUs are all set to 1, the receiving device can determine that the three 996-tone RUs should be combined to obtain a multiple RU, including (one 996-tone RU + one 996-tone RU + one 996-tone RU). In some other possible implementations of this request, in addition to adding a merge indicator after each resource unit allocation subfield to indicate merge information, the merge indicator corresponding to each resource unit allocation subfield can be extracted together. In other words, there is a multiple resource unit allocation field (multiple RU allocation field) within the signal field, and the multiple resource unit allocation field includes the merge indicator corresponding to each resource unit allocation subfield. For example, Figure 11 is a schematic diagram of an example of a signal field according to this request. The signal field further includes a multiple resource unit allocation field, and the resource unit allocation field... Multiple resource allocation includes a combination indication corresponding to each resource unit allocation subfield. The relative location of the combination indication in the multiple resource unit allocation field is the same as the relative location of the corresponding resource unit allocation subfield for the combination indication in a plurality of resource unit allocation subfields. The multiple resource unit allocation field indicates a RU combination state indicated by at least one resource unit allocation subfield included in the signal field. A specific indication form is the same as the previous indication form of adding an indication bit after each resource unit allocation subfield. For example, for a bandwidth of 320 MHz, the length of the combination indication included in the multiple resource unit allocation field can be either 16 or 32 bits. Optionally, in this implementation of this request, the multiple resource unit allocation subfield can be included in a common field. It should be understood that, in this implementation of this application, the newly added Multi-Resource Unit Allocation field to the signal field can have two forms of composition. Figure 12 is a schematic diagram of a Multi-Resource Unit Allocation field according to one implementation of this application. As shown in Figure 12, the Multi-Resource Unit Allocation field is the same as a Common Field and a User Specific field, and is divided into a plurality of CCs. Each CC carries some content from the Multi-Resource Unit Allocation field. Figure 13 is a schematic diagram of a Multi-Resource Unit Allocation field according to another implementation of this application. As shown in Figure 13, the Multi-Resource Unit Allocation field is not divided, and fully repeated content is used across all 20 MHz channels.In other words, the multiple resource unit allocation field in each 20 MHz channel is the same. Optionally, in some possible implementations of this application, the resource unit allocation subfield may not need to be extended, and the resource unit allocation subfield is extended, with the combination information for the resource units indicated by a combination indication included in an extended resource unit allocation subfield. Instead, a reserved entry indicates the combination information for the resource units. For example, as shown in Table 1, a plurality of 8-bit reserved indices can indicate combination information for resource units corresponding to different resource unit allocation forms. ML / í UO Jó Optionally, in some other possible implementations of this application, the resource unit allocation subfield can be further redefined; that is, the resource unit allocation subfield is reconstructed. A reconstructed resource unit allocation subfield corresponds to the allocation of resource units in the frequency domain of a 20 MHz channel and the combination state of the resource units. In other words, a reconstructed resource unit allocation subfield indicates the size and location of one or more resource units included in the 20 MHz channel and the combination state of the resource units. The resource unit allocation subfield is reconstructed so that the combination information of multiple resource units can be displayed directly in the common field.In this way, after reading the common field, a user can directly learn a new RU distribution sequence and a new RU combination method. Therefore, even for a user with multiple RUs, only one user field is needed to determine the new RU distribution sequence and the new RU combination method. For example, the length of the rebuilt resource unit allocation subfield can be 9 bits, 10 bits, or more. This is not limited in this application. It should be understood that the Reconstructed Resource Unit (RU) allocation subfield can indicate either a limited or unlimited RU combination. For example, for a small RU combination within a 20 MHz channel, the locations, indicated by the Reconstructed Resource Unit (RU) allocation subfield, of a 52-tone RU, a 106-tone RU, and a 26-tone RU that need to be combined are not limited. For instance, a 26-tone RU that needs to be combined with a 52-tone RU or a 106-tone RU can be contiguous or non-contiguous to the 52-tone RU or the 106-tone RU. For a large RU combination into a 242-tone RU, a Reconstructed Resource Unit (RU) allocation subfield from a corresponding configuration on a corresponding 20 MHz channel is used.For example, if there is a combination of a 242-tone RU + a 242-tone RU within an 80 MHz channel, only the resource unit allocation subfields that indicate the combination of a 242-tone RU + a 242-tone RU need to be used in both corresponding 20 MHz channels. Optionally, in some possible implementations of this request, a receiving device can be further notified of multiple RU combination information by extracting and indicating a valid RU. In other words, all valid RUs are extracted and sorted according to a sequence in which the user reads the valid RUs. A valid RU corresponds to 1 bit. A set of valid RUs is {52, 106, 242, 484, 996}, and a number in the set indicates the number of subcarriers that make up the RU. Valid RUs are associated ML / í UO Jó based on the locations of valid RUs in a bandwidth. For example, if there are 20 valid RUs in a 320 MHz channel, at least 20 bits are needed to indicate the combined RU information. For example, for the combination of small-sized RUs within a 242-tone RU, each valid small-sized RU can correspond to 1 bit, indicating whether a corresponding valid small-sized RU and a 26-tone RU are combined to form a multiple RU. A set of valid small-sized RUs is {52, 106}. Specifically, the multiple resource unit allocation field in the signal field can include a plurality of combination indications. Each combination indication corresponds to a valid small-sized RU and indicates whether the valid small-sized RU and a 26-tone RU are combined within the 242-tone RU containing the valid small-sized RU.For example, when a combination indicator bit corresponding to a valid small RU is set to 1, it indicates that the valid small RU and a 26-tone RU within the 242-tone RU in which the valid small RU is located are combined, and when a combination indicator bit corresponding to the valid small RU is set to 0, it indicates that the valid small RU is not combined. Alternatively, when a combination indicator bit corresponding to a valid small RU is set to 0, it indicates that the valid small RU and a 26-tone RU within the 242-tone RU in which the valid small RU is located are combined, and when the combination indicator bit corresponding to the valid small RU is set to 1, it indicates that the valid small RU is not combined. It should be understood that when the combination indication states that the valid small-sized RU and the 26-tone RU are combined within the 242-tone RU in which the valid small-sized RU is located, the 26-tone RU combined with the valid small-sized RU may be a 26-tone RU adjacent to the valid small-sized RU. For example, the valid small-sized RU and a first 26-tone RU to the left or right of the valid small-sized RU are combined to form a multiple RU. In other words, a combination indication corresponding to a valid small-sized RU indicates a limited form of small-sized RU combination. It may be understood that, for the combination of small RUs within a 242-tone RU, a 242-tone RU may include a maximum of three valid small RUs. Therefore, a 242-tone RU (or a resource unit allocation subfield) may correspond to a 1-bit combination indication, and the 1-bit combination indication may correspond to either a 52-tone RU or a 106-tone RU. Alternatively, a 242-tone RU may correspond to a 2-bit combination indication. Each bit in ML / í UO Jó the 2-bit combination indication indicates a 52-tone RU; or 1 bit in the 2-bit combination indication indicates a 52-tone RU and the other bit indicates a 106-tone RU. Alternatively, a 242-tone RU can correspond to a 3-bit combination indication, and each bit in the 3-bit combination indication indicates a 52-tone RU. It should be understood that, for the combination of small RUs within a 242-tone RU, because there can be a plurality of valid small RUs in the RUs indicated by an RU allocation subfield, the lengths of the combination indications corresponding to different RU allocation subfields may differ. Therefore, the length of the multi-resource unit allocation field is variable. Optionally, the length of the combination indication corresponding to the RU allocation subfield may be indicated in the common field. Alternatively, the lengths of the combination indications corresponding to different RU allocation subfields may be set to be equal. For example, assuming a maximum of x valid RUs are combined in each RU allocation subfield, for N RU allocation subfields, the length of the multi-resource unit allocation field is N * x bits. For the combination of large size RUs in a 242-tone RU, i.e., an indication of valid large size RU combinations, a valid large size RU set is {242, 484, 996}. Optionally, in a possible implementation, in the merge indications included in the multiple resource unit allocation field, a valid large RU can correspond to a 2-bit merge indication. Different values ​​of the 2-bit merge indication indicate different sequences of the valid large RU during resource unit merge. For example, when a merge indication bit is set to 00, it indicates that the valid large RU is not merged. When the merge indication bit is set to 01, 10, and 11, it indicates, respectively, that the valid large RU is at the beginning, middle, and end of a merge location. Optionally, in a possible implementation, in the combination indications included in the multiple resource unit allocation field, a valid large RU corresponds to a 2-bit indication bit. Different values ​​of the 2-bit indication bit indicate different combination states of the valid large RU during resource unit combination. For example, when a combination indication bit is set to 00, it indicates that the valid large RU is not combined. When the combination indication bit is set to 01, 10, and 11, it separately indicates different types of combinations of valid large RUs, and the combinations are then performed accordingly. ML / t / ZUZZ / U í UO Jó Valid large size RU corresponding to combination indications with the same value. In some possible implementations of this application, for the combination of large-size RUs into a 242-tone RU—that is, the combination indication of valid large-size RUs—a valid large-size RU can alternatively correspond to a 1-bit indication bit and indicate whether the valid large-size RU is combined. For example, when the combination indication bit is set to 0, it indicates that the valid large-size RU is not combined, and when the combination indication bit is set to 1, it indicates that the valid large-size RU is combined. Indeed, when the combination indication bit is set to 1, it can alternatively indicate that the valid large-size RU is not combined, and when the combination indication bit is set to 0, it indicates that the valid large-size RU is combined.In this case, it is necessary to predefine the combination, locations and the like of a plurality of large RUs included in a multiple RU. For example, Table 10 is a schematic diagram of an example of correspondence between a combination indication and a valid large RU. Table 10 ML / t / ZUZZ / U í UO Jó Valid large RUs indicated by different subfields 242 242 242 242 996 484 242 242 996 of pitch assignment pitch ... In the example shown in Table 10, when the combination indicator bit is set to 0, it indicates that the valid large RU corresponding to the combination indicator is not combined, and when the combination indicator bit is set to 1, it indicates that the valid large RU corresponding to the combination indicator is combined. In this case, confusion can arise if no limitations are imposed. In the example shown in Table 10, it is difficult to distinguish whether a 996-tone RU + a 484-tone RU + a 242-tone RU are combined into a multiple RU, or whether a 242-tone RU + a 242-tone RU + a 996-tone RU are combined into a multiple RU. Therefore, a combination group, combination shape, or similar feature of large RUs can be predefined or configured. For example, this can be addressed by selecting a default combination that appears from left to right.The predefined large RU combination is assumed to be a 242-tone RU + a 242-tone RU + a 996-tone RU; that is, the multiple RU shown in Table 10 can be determined to include the 242-tone RU + the 242-tone RU + the 996-tone RU. It should be understood that, in Table 10, a 996-tone RU corresponds to four RU assignment subfields, and the combination indication values ​​for all RU assignment subfields are the same (e.g., all are either 1 or 0). A 484-tone RU corresponds to two RU assignment subfields, and the combination indication values ​​for all RU assignment subfields are the same (e.g., both are 1). In other words, a combination indication, of one or more bits, corresponding to each valid large RU can indicate the limited combination form of the large RUs described above. Specifically, the number, locations, and combination of large RUs that can be combined are limited to a certain extent. For example, a plurality of combination groups of large RUs that can be combined can be predefined, and a combination indication can indicate any of the plurality of combination groups of large RUs. According to a method of indicating combination of resource units provided in this application, valid RUs are extracted and combination indications indicating whether valid RUs are combined are organized based on the locations of the valid RUs, so that the combination information of multiple RUs can be effectively indicated. It should be understood that, in addition to the combination indications corresponding to valid RUs being uniformly set in the multiple resource unit allocation field in the signal field, the resource unit allocation subfield can optionally be extended further. A combination indication for a valid RU corresponding to each resource unit allocation subfield is set after a corresponding resource unit allocation subfield. For example, an extended resource unit allocation subfield can have 9 bits, 10 bits, or more bits, and one or more extended bits separately indicate the combination states of the valid RUs. Optionally, in some possible implementations of this request, in addition to ML / í UO Jó the common field in the signal field is improved to implement the combination of multiple RUs, the user field can be further improved to notify the combination of multiple RUs. In one possible implementation, the STA IDs in different User Fields can be configured to be the same. This way, a user can know that multiple corresponding RUs are assigned to them, thus providing notification of the RU combination information. In another possible implementation, a multiple RU is formed by combining a plurality of contiguous or non-contiguous RUs. A plurality of contiguous or non-contiguous RUs forming the multiple RU can be assigned to a user, and the corresponding STA IDs for each RU are the same. Therefore, the information in user fields with the same STA ID, other than the last user field, can be modified. For example, in each user field with the same STA ID, other than the last user field, the 9-bit indication information can display either absolute location information or relative location information for a subsequent RU belonging to (or corresponding to) the user. A multi-resource unit user can directly learn the location of a subsequent RU based on this indication after reading the first RU. This reduces power consumption to some extent. In yet another possible implementation, a multiple RU is formed by combining a plurality of contiguous or non-contiguous RUs. The plurality of contiguous or non-contiguous RUs that form the multiple RU can be assigned to a user, and the corresponding STA IDs for the plurality of RUs are the same. Therefore, in this embodiment of the application, in each of a plurality of user fields with the same STA ID (other than a last user field), the 8-bit indication information can indicate either absolute location information or relative location information of a subsequent RU belonging to the user. In other words, it indicates the locations, sizes, and similar characteristics of the plurality of RUs that form the multiple RU. For example, in each of the plurality of user fields with the same STA ID other than the last user field, the location of a subsequent RU to be combined and which is from a corresponding RU to the user field can be flexibly identified by indicating two pieces of information: an index channel number and an RU occurrence order. Specifically, after a STA determines a resource unit allocation subfield, the STA can determine, using a 4-bit indication, a channel in which there is a RU that needs to be combined with a RU in which there is ML / t / ZUZZ / U í UO Jó currently the STA (the 4-bit indication can indicate 16 channels). The STA can use another 4 bits to indicate a specific RU location (each of 242 tones includes a maximum of nine RUs) on each channel. Therefore, 8 bits can flexibly indicate the location of a subsequent RU that needs to be merged. In other words, in the plurality of user fields with the same STA ID other than the last user field, an 8-bit indication field can indicate location information for a subsequent RU that needs to be merged with a current user field. In this way, the information about the RU that needs to be merged with a RU where a current user is located is determined. For example, when a multiple RU is formed by combining two RUs, the STA IDs of two user fields corresponding to the two RUs are the same. Therefore, in a first user field, an 8-bit indicator field can indicate location information for a subsequent RU that must be combined with a current user field so that the multiple RU can be determined. For another example, when a multiple RU is formed by combining three RUs, the STA IDs of the three user fields corresponding to the three RUs are the same. There can be an 8-bit indicator field in both a first and a second user field. This 8-bit indicator field separately indicates the locations of a second and a third RU that must be combined, so that the multiple RU can be determined. Similarly, when a multiple RU is formed by combining more RUs, the multiple RU can only be determined by setting an 8-bit indicator field in a user field corresponding to a RU other than the last RU. It should be understood that the 8-bit indication field in the user field can indicate either a limited or a restricted combination form. Furthermore, it can indicate the combination of small RU sizes within the 20 MHz channel, or the combination of large RU sizes along a 242-tone RU. In some other possible implementations, in each of a plurality of user fields with the same STA ID other than the last user field, 4 bits can further indicate RU location information in a limited RU combination. It is assumed that a small RU in a 242-tone RU does not support combination along a 242-tone RU. For small RU combinations within the 20 MHz channel, because there is a maximum of nine RUs in each 242-tone RU, 4 bits can fully indicate the location of the next combined RU. Certainly, for small RU combinations within the 20 MHz channel, 3 bits can also fully indicate the location of the next combined RU. Therefore, for small RU combinations within the 20 MHz channel, in a plurality of user fields with the same STA ID other than a last user field, 3 bits or ML / t / ZUZZ / U í UO Jó bits can indicate information about a RU that needs to be combined with a RU in which a current (or corresponding) user is located. For combining a large RU into a 242-tone RU, since a small RU cannot be combined with a large RU in a 242-tone RU, a specific number of indication bits can specify the type of large RU, and a specific number of indication bits specify the location of the large RU. The large RU that needs to be combined is indicated by specifying two pieces of information: the type of large RU and the location of the large RU. The type of large RU refers to a 242-tone RU, a 484-tone RU, or a 996-tone RU. For example, in each of the plurality of user fields with the same STA ID, other than the last user field, 2 bits can indicate a type of RU that should be combined with a large RU in which a current user is located.For example, the large RU types indicated by setting the 2 bits to 00, 01, and 10 respectively are a 242-tone RU, a 484-tone RU, and a 996-tone RU, and the other 2 bits indicate subsequent large RUs of the type. In other words, in each of the plurality of user fields with the same STA ID, other than the last user field, 3 or 4 bits can indicate information about the large RU that must be combined with the RU in which the current user is located. For example, when a multiple RU is formed by combining three large RUs, there can be a 4-bit indicator field in the first user field and a second indicator field in three user fields corresponding to the three large RUs. The 4-bit indicator field indicates the locations of the second and third large RUs that must be combined so that the multiple RU can be determined. Similarly, when a multiple RU is formed by combining more RUs, the multiple RU can only be determined by setting the 4-bit indicator field in all user fields corresponding to the RUs other than the last RU. For example, for the multiple RU (one 242-tone RU + one 242-tone RU) formed in combination form 1 shown in Table 5, there may be a 4-bit indicator bit in a user field corresponding to the first 242-tone RU, and 4 bits are set to 0010. The first 2 bits are set to 00 to indicate that the next RU to be combined is a 242-tone RU, and the last 2 bits are set to 10 to indicate that the RU is a third RU after a current RU. The user can determine the multiple RU by referencing the information in the known resource unit allocation subfield. It may not be necessary to modify a user field corresponding to the second 242-tone RU. Therefore, the bit of ML / t / ZUZZ / U í UO JJ 4-bit indication can indicate a limited combination form of multiple RUs. It should also be understood that if further flexibility of the indication is required, the number of bits used can be increased even more. For example, in each of the plurality of user fields with the same STA ID, other than the last user field, an indication bit of a different length indicates information about the large RU that should be combined with the RU in which the current user is located. Optionally, in this implementation of this request, regardless of whether the combination of large or small RUs is used, for a plurality of user fields corresponding to a plurality of RUs to be combined, because the STA IDs of the plurality of user fields are the same, an indicator bit can be added to the user field to show whether each of the plurality of user fields (including a final user field) is the last user field. This indicator bit indicates whether the user field corresponds to a final RU to be combined. This prevents the user from assuming that the final user field also includes information indicating the location of a subsequent RU. For example, a 1-bit indicator is used.The 1 bit in a user field other than the last user field is set to 1, to indicate that the corresponding user field is not the last user field, and the 1 bit in a user field other than the last user field is set to 0, to indicate that the corresponding user field is the last user field. It should be noted that, since there is a correspondence between the location of a RU and the location of a user field in a specific user field, an indication of the location of the RU is an indication of the location of the user field corresponding to the RU. Optionally, in this implementation of this request, for a plurality of user fields corresponding to a plurality of RUs that need to be combined, because the STA IDs of the plurality of user fields are the same, an indicator bit indicating the number of RUs that need to be combined can be added to each of the plurality of user fields (including a final user field) to indicate the number of RUs that need to be combined. For example, when four RUs need to be combined, the length of the indicator bit can be 2 bits. The value of the indicator bit in each user field is the same, so the user can more accurately read the number of RUs that need to be combined. In other possible implementations of this request, the signal field may further include a multi-RU allocation field, and the multi-RU allocation field includes a plurality of ML / í UO Jó Location Information Indication subfields. A location information indication subfield indicates a location of a RU that is to be combined into a multiple RU. Two or more of the plurality of location information indication subfields form a group, and a plurality of RUs indicated by a group of location information indication subfields are combined into a multiple RU. Based on reading the resource unit allocation subfield, with reference to a plurality of location information indication bits, a user can learn a RU assigned to the user according to the order in which the user appears in the user-specific field, to obtain further multiple RU combination information based on obtaining a RU allocation form. In this way, users are still ordered based on a RU occurrence sequence, and each user appears only once in the user-specific field.Information such as an assigned RU can be obtained by searching the user's location. Specifically, in a possible implementation, the following provides a description with reference to an example shown in Fig. 14. Fig. 14 is a schematic diagram of an example of a signal field according to this request. The signal field further includes a multiple resource unit assignment field, the multiple resource unit assignment field includes a plurality of location information indication subfields, and one location information indication subfield indicates a location of a resource unit that needs to be combined into a multiple resource unit. The resource units indicated by the neighboring location information indication field must be combined. For example, in the example shown in Fig. 14, the multiple resource unit assignment field includes six location information indication subfields, and one location information indication subfield indicates a location of a resource unit that needs to be combined into a multiple resource unit.It is assumed that three RUs indicated by a location information indication subfield 1 through a location information indication subfield 4 are to be combined into one multiple RU, and two RUs indicated by a location information indication subfield 5 and a location information indication subfield 6 are to be combined into another multiple RU. As shown in Fig. 15, each rectangle indicates an RU, a number within the rectangle indicates a specific user corresponding to the RU (or a user field occurrence sequence), and each row of rectangles corresponds to a 20 MHz bandwidth. It is assumed that location information indication subfield 1 indicates location 1, indicating the first rectangle in the first row, and location information indication subfield 2 indicates location 2, indicating the second rectangle in the third row.Furthermore, the RUs in location 1 and location 2 can be combined. The information indication subfield of. Location 3 also indicates location 2. To be specific, both the location information indication subfield 3 and the location information indication subfield 2 indicate the RU at location 2. The location information indication subfield 4 indicates a location 3, showing a third rectangle in the third row. Furthermore, location 3 corresponds to only one location information indication subfield 4. It can be determined that a RU at location 3 is a final RU included in a multiple RU, and only the RU indicated by the location information indication subfield 4 and the RU indicated by a previous location information indication subfield (the location information indication subfield 3) should be combined.Therefore, it can be determined that a multiple RU includes: the RU indicated by location information indication subfield 1 + the RU indicated by location information indication subfield 2 or 3 + the RU indicated by location information indication subfield 4. To be specific, when a multiple RU includes three RUs, one RU in the middle corresponds to two location information indication subfields. In other words, four location information indication subfields are needed to indicate the combination of the three RUs. Furthermore, location information subfield 5 indicates location 4, which indicates a second rectangle in a second row, and location information subfield 6 indicates location 5, which indicates a third rectangle in the second row. If no other location information subfield 6 subsequently also indicates location 5, it can be determined that the other multiple RU includes an RU indicated by location information subfield 5 and an RU indicated by location information subfield 6. A user can determine an RU assigned to them based on the order in which the user appears in the user-specific field, to obtain more information about the combination of multiple RUs based on obtaining a RU assignment form. For example, in the example shown in Fig.13, the three RUs corresponding to location 1 to location 4 are combined into one multiple RU used by user 1. The two RUs corresponding to location 5 to location 6 are combined into another multiple RU used by user 10. Optionally, the length of each location information indication subfield can be 4 bits, 8 bits, 9 bits, or another length, to indicate the combination of small RUs within a 242-tone RU and the combination of large RUs within a 242-tone RU. Optionally, both the combination of small RUs within a 242-tone RU and the combination of large RUs within a 242-tone RU can be a limited RU combination. Optionally, in another possible implementation, a 1-bit group indication bit can be added to each location information indication subfield, and the RUs Locations indicated by multiple location information indication subfields whose group indication bit values ​​are the same can be combined into a multiple RU. For example, as shown in Fig. 13, if a multiple RU includes all three RUs, a separate 1-bit group indication bit can be added to three location information indication subfields corresponding to the three RUs, and the group indication bit values ​​for the three RUs are the same. In this way, it can be indicated that the three RUs should be combined into a multiple RU. The RUs that need to be combined into a multiple RU are not determined by repeatedly indicating the location of an RU, so the number of required location information indication subfields can be reduced. In other words, three location information indication subfields can indicate a combination of the three RUs.User References (URs) in the same location do not correspond to two subfields of location information. A user can determine an assigned UR based on the order in which the user appears in the user-specific field. For more information on combining multiple URs, see the UR assignment form. Additionally, the same user must appear only once in the user-specific field. It should be understood that, in this implementation of this request, the length of the multiple resource unit allocation field may be specified in the common field. Furthermore, the plurality of location information subfields included within the multiple resource unit allocation field may exist in both CC 1 and CC 2. Alternatively, some of the plurality of location information subfields may exist in CC 1, and the other part in CC 2. This is not limited in this implementation of the request. Optionally, in some other possible implementations of this application, for a combination state of a Center 26-tone RU in the middle of each 80 MHz channel, the Center 26-tone RU can also be combined with another RU to create a multiple RU. The existence of the Center 26-tone RU depends on the value of a Center 26-tone RU field in the common field, and this field is 1 bit. When bit 1 is set to 1, it indicates that the Center 26-tone RU exists. When bit 1 is set to 0, it indicates that the Center 26-tone RU does not exist. In one possible implementation, the center 26-tone RU field can be extended to a plurality of bits, for example, 2 bits. When the 2 bits are set to 00, it indicates that the center 26-tone RU does not exist in a corresponding 80 MHz frequency band. When the 2 bits are set to 01, it indicates that the center 26-tone RU exists in the corresponding 80 MHz frequency band, but the center 26-tone RU is not combined; it is ML / t / ZUZZ / U í UO Jó, that is, it does not combine with another RU. When the 2 bits are set to 10 and 11, it separately indicates that the center 26-tone RU exists in the corresponding 80 MHz frequency band, and the center 26-tone RU must be combined with another RU. For example, when both bits are set to 10, it indicates that the central 26-tone RU and an adjacent RU within a range of 242 tones to the right of the central 26-tone RU are combined to form a multiple RU. When both bits are set to 11, it indicates that the central 26-tone RU and an adjacent RU within a range of 242 tones to the left of the central 26-tone RU are combined to form a multiple RU. For another example, when the 2 bits are set to 10, it indicates that the central 26-tone RU and a RU that is within 242 tones to the right of the central 26-tone RU and closer to the central 26-tone RU are combined to form a multiple RU. When the 2 bits are set to 11, it indicates that the central 26-tone RU and a RU that is within 242 tones to the left of the central 26-tone RU and closer to the central 26-tone RU are combined to form a multiple RU. The RU adjacent to the central 26-tone RU can be understood as an RU preceding or following the central 26-tone RU. The RU closest to the central 26-tone RU may or may not be an RU adjacent to the central 26-tone RU. For example, the RU closest to the central 26-tone RU could be an RU that lies within the coordinates of the central 26-tone RU or to the right of the coordinates of the central 26-tone RU and is separated from it by a plurality of RUs. It should be understood that, in this implementation of this application, the central 26-tone RU field can be further extended to a plurality of bits, to indicate more combination states of the central 26-tone RU. It should also be understood that a RU, within the range of 242 tones, which is the closest or contiguous to the central RU of 26 tones, can be a RU of 52 tones, a RU of 106 tones, a RU of 242 tones or similar. In another possible implementation, a combination indicator showing whether the central 26-tone RU and a plurality of RUs are combined can be further set in a user field corresponding to the central 26-tone RU. In other words, the user field corresponding to the central 26-tone RU is modified. Furthermore, all users must read the user field corresponding to the central 26-tone RU and determine if an STA ID in the user field corresponding to the central 26-tone RU matches their user IDs. If the STA ID in the user field corresponding to the central 26-tone RU matches their user IDs, the central 26-tone RU and a corresponding RU in the current user field must be combined. It should be understood that in the implementation of this request, first, second and The terms ML / í UO JJ and similar terms are intended simply to indicate that a plurality of objects are different. For example, a first field and a second field are used simply to indicate different fields. The field itself, a number of fields, and similar terms should not be affected. The above first, second, and similar terms should not constitute any limitation on the realizations of this application. It should also be understood that the division of forms, cases, categories, and realizations in the realizations of this application is merely intended to facilitate the description and should not constitute a particular limitation. The characteristics in the modes, categories, cases, and realizations may be combined without contradiction. It should also be understood that the numbers used in the implementations of this application are differentiated simply to facilitate description, but are not used to limit the scope of the implementations of this application. The sequence numbers of the processes mentioned above do not signify execution sequences. The execution sequences of the processes should be determined according to the functions and internal logic of the processes, and should not be interpreted as a limitation on the implementation processes of the implementations of this application. It should also be understood that the preceding description is intended merely to assist a person skilled in the art in better understanding the realizations of this request, rather than to limit the scope of the realizations of this request. It is evident that a person skilled in the art may make various modifications or equivalent changes based on the preceding examples. For example, in the preceding method 200, some steps may be unnecessary or some steps may be added again. Alternatively, two or more of the preceding realizations may be combined. A modified, changed, or combined solution also falls within the scope of the realizations of this request. It should also be understood that the preceding description of the embodiments in this application emphasizes the differences between the embodiments. For identical or similar parts not mentioned, refer to the embodiments. For the sake of brevity, the details are not described again here. It should also be understood that in implementations of this request, the predefinition may be implemented by pre-storing the corresponding code or a corresponding table on a device (for example, a terminal device or a network device) or in some other way that can indicate related information. A specific implementation of the predefinition is not limited in this request. The above describes in detail the method of indicating the combination of resource units in embodiments of this application with reference to Fig. 1 to Fig. 15. Communication devices in embodiments of this application are then described in detail with reference to Fig. 16 to Fig. 22. Figure 16 is a schematic block diagram of a communications device 400 according to one embodiment of this application. The device 400 may correspond to the sending device described in the preceding methods, or it may be a chip or component used in the sending device. Furthermore, the modules or units of the device 400 are respectively configured to perform actions or processing operations carried out by the sending device in the preceding methods. As shown in Figure 16, the communications device 400 may include a processing unit 410 and a communications unit 420. Processing unit 410 is configured to determine a Physical Layer Protocol Data Unit (PPDU). The PPDU includes a signal field; the signal field includes a resource unit allocation subfield and a combination indication corresponding to the resource unit allocation subfield; the resource unit allocation subfield indicates a plurality of resource units; and the combination indication indicates combination information for the plurality of resource units. The 420 communications unit is configured to send the PPDU. Alternatively, processing unit 410 is configured to determine a Physical Layer Protocol Data Unit (PPDU). The PPDU includes a signal field; the signal field includes a plurality of resource unit allocation subfields and a plurality of combination indications; the plurality of resource unit allocation subfields indicates a plurality of resource units; the plurality of combination indications indicates combination information for the plurality of resource units; a combination indication corresponds to a resource unit (RU) indicated by a resource unit allocation subfield; and a resource unit is a 242-tone RU, a 484-tone RU, or a 996-tone RU. The 420 communications unit is configured to send the PPDU. The communications apparatus provided in this application can be used to assist one or more users in transmitting data using a plurality of contiguous or non-contiguous RUs, and to indicate the combined status of the plurality of RUs to the user. This improves the flexibility of RU allocation in a system and enhances the utilization of the system's spectrum. It should be understood that for a specific process of performing the corresponding steps above by the units in the apparatus 400, refer to the above description with reference to the embodiments of the method in Fig. 9 to Fig. 15. For the sake of brevity, the details are not described here again. Optionally, the 420 communications unit can include a unit (module) of The ML / t / ZUZZ / U / UO JJ receiving and sending unit (module) are configured to perform the step of sending information via the sending device in the methods described above. Optionally, the communications apparatus 400 may also include a storage unit 430. The storage unit 430 is configured to store instructions executed by the communications unit 420 and the processing unit 410. The communications unit 420, the processing unit 410, and the storage unit 430 are coupled together. The storage unit 430 stores instructions. The processing unit 410 is configured to execute the instructions stored in the storage unit 430. The communications unit 420 is configured to send or receive a specific signal under the control of the processing unit 410. The processing unit 410 can be a processor. The communications unit 420 can be a transceiver, an input / output interface, or an interface circuit. The storage unit 430 can be memory. As shown in Fig. 17, a communications apparatus 500 can include a processor 510, memory 520, and a transceiver 530. When the communications apparatus is a chip in a communications device, the storage unit can be a storage unit (for example, a register or a cache) on the chip, or it can be a storage unit (for example, read-only memory or random-access memory) off the chip in the communications device. An expert in the technique will clearly understand that, for the steps performed by the 400 and 500 communication devices and their corresponding beneficial effects, refer to the related description of the sending device in the implementation of the above method. For the sake of brevity, the details are not described again here. The 400 or 500 series communications device can be a transmitting device. For example, the transmitting device could be an access point (AP), a station (STA), or a network device. Figure 18 is a schematic block diagram of a communication device 600 according to one embodiment of this application. The device 600 may correspond to the receiving device described in the preceding embodiments, or it may be a chip or component used in the receiving device. Furthermore, the modules or units in the device 600 are respectively configured to perform actions or processing operations carried out by the receiving device in the embodiment of the preceding method. As shown in Figure 18, the communication device 600 may include a communication unit 610 and a processing unit 620. The 610 communications unit is configured to receive a Physical Layer Protocol Data Unit (PPDU). The PPDU includes a signal field, which in turn includes a resource unit allocation subfield and a combination indication. ML / t / ZUZZ / U í UO JJ corresponding to the resource unit allocation subfield, the resource unit allocation subfield indicates a plurality of resource units, and the combination indication indicates combination information of the plurality of resource units. The 620 processing unit is configured to determine the combination information of the plurality of resource units based on the PPDU. Alternatively, the 610 communications unit is configured to receive a Physical Layer Protocol Data Unit (PPDU). The PPDU includes a signal field; the signal field includes a plurality of resource unit allocation subfields and a plurality of combination indications; the plurality of resource unit allocation subfields indicates a plurality of resource units; the plurality of combination indications indicates combination information for the plurality of resource units; a combination indication corresponds to a resource unit (RU) indicated by a resource unit allocation subfield; and a resource unit is either a 242-tone RU, a 484-tone RU, or a 996-tone RU. The 620 processing unit is configured to determine the combination information of the plurality of resource units based on the PPDU. According to the communications apparatus provided in this application, the combination indication in the signal field can indicate a combination state of small RUs within a 20 MHz channel, to help one or more users transmit data using a plurality of contiguous or non-contiguous RUs. This improves the RU allocation flexibility of a system and enhances the utilization of the system's spectrum. It should be understood that for a specific procedure for performing the corresponding steps above using the units in the 600 device, refer to the description of the receiving device in the previous embodiment. For the sake of brevity, the details are not described again here. Optionally, the communications unit 610 may include a receiving unit (module) and a sending unit (module) configured to perform the step of receiving information from the receiving device in the implementation of the method. Optionally, the communications apparatus 600 may also include a storage unit 630. The storage unit 630 is configured to store instructions executed by the communications unit 610 and the processing unit 620. The communications unit 610, the processing unit 620, and the storage unit 630 are coupled together. The storage unit 630 stores instructions. The processing unit 620 is configured to execute the instructions stored in the storage unit 630. The communications unit 610 is configured to send or ML / t / ZUZZ / U í UO Jó receive a specific signal under the direction of the processing unit 620. It should be understood that the processing unit 620 can be implemented using a processor, and the communications unit 610 can be implemented using a transceiver. The storage unit 630 can be implemented using memory. As shown in Fig. 19, a communications device 700 can include a processor 710, a memory 720, and a transceiver 730. An expert in the field will clearly understand that, for the steps performed by the 600 and 700 communication devices and their corresponding beneficial effects, refer to the related description of the receiving device in the previous embodiment. For the sake of brevity, the details are not described again here. The 600 or 700 communications apparatus can be a receiving device, for example, a terminal device. It should also be understood that the division of units within the device is simply a division of logical function. During actual implementation, all or some of the units may be integrated into a single physical entity or they may be physically separate. Furthermore, all the device's units may be implemented in a form where a processing element invokes software, or they may be implemented as hardware; or some units may be implemented as software invoked by a processing element, and some units may be implemented as hardware. For example, the units may be separately arranged processing elements, or they may be integrated onto a chip within the device for implementation. Additionally, the units may be stored in memory as programs and invoked by a processing element of the device to perform the units' functions.The processing element in this document may also be called a processor and may be an integrated circuit with signal processing capabilities. During implementation, the steps in the preceding methods or units may be implemented using a hardware integrated logic circuit in the processing element, or they may be implemented in the way that a processing element invokes software. For example, a unit in any of the above devices may be one or more integrated circuits configured to implement the methods described above, for example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more field-programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuits. For another example, when the units in the device can be implemented in a way that a processing element schedules a program, the processing element may be ML / í UO Jó a general-purpose processor, for example, a central processing unit (CPU) or another processor that can invoke the program. For another example, the units can be integrated together and implemented in the form of a system-on-a-chip (SoC). Figure 20 is a schematic diagram of the structure of an 800 terminal device according to this application. The 600 or 700 device can be configured as the 800 terminal device. Alternatively, the 600 or 700 device can be the 800 terminal device. In other words, the 800 terminal device can perform an action carried out by the receiving device in the implementation of the above method. For ease of description, Fig. 20 shows only the main components of the terminal device. As shown in Fig. 20, the 800 terminal device includes a processor, memory, a control circuit, an antenna, and an input / output device. The processor is configured primarily to: process a communications protocol and communications data, control the entire terminal device, execute a software program, and process software program data; for example, configured to assist the terminal device in performing the actions described in the previous embodiment of the resource unit combination indication method. The memory is configured primarily to: store the software program and data; for example, store a codebook as described in the previous embodiment. The control circuit is configured primarily to: perform the conversion between a baseband signal and a radio frequency signal, and process the radio frequency signal. A combination of the control circuit and the antenna can also be called a transceiver, configured primarily to send / receive a radio frequency signal in the form of an electromagnetic wave.The input / output device, for example, a touch screen, a display, a keyboard, or the like, is primarily configured to: receive data entered by a user, and output data to the user. After the terminal device is powered on, the processor can read the software program from a storage unit, interpret and execute the software program's instructions, and process the software program's data. When it is necessary to send data wirelessly, after performing baseband processing on the data to be sent, the processor sends a baseband signal to a radio frequency circuit. After performing radio frequency processing on the baseband signal, the radio frequency circuit sends a radio frequency signal in the form of an electromagnetic wave through the antenna. When data is sent to the terminal device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal back into a baseband signal, and sends the baseband signal to the processor. The processor ML / UO Jó converts the baseband signal into data and processes the data. A person skilled in the art may understand that, for ease of description, Figure 20 shows only one memory and one processor. An actual terminal device may include multiple processors and memories. Memory may also be referred to as storage medium, storage device, or similar terms. This is not a limitation in this embodiment of the application. For example, the processor may include a baseband processor and a central processing unit (CPU). The baseband processor is primarily configured to process the communication protocol and communication data. The CPU is primarily configured to control the entire terminal device, execute the software program, and process the software program data. The processor in Figure 20 integrates the functions of both the baseband processor and the CPU. Those skilled in the art will understand that, alternatively, the baseband processor and the CPU can be independent processors, interconnected using a technology such as a bus.A person skilled in the field may understand that a terminal device can include multiple baseband processors to accommodate different network standards, and multiple central processing units to enhance its processing capabilities. Components of the terminal device may be connected via various buses. The baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip. The central processing unit may also be referred to as a central processing circuit or a central processing chip. Communication protocol processing and data may be incorporated into the processor or stored on a storage device as a software program.The processor executes the software program to implement a baseband processing function. For example, in this implementation of this application, the antenna and control circuitry, which have both receiving and transmitting functions, can be considered as a transceiver unit 801 of terminal device 800, and the processor, which has a processing function, can be considered as a processing unit 802 of terminal device 800. As shown in Fig. 10, terminal device 800 includes the transceiver unit 801 and the processing unit 802. The transceiver unit may also be referred to as a transceiver, transceiver machine, transceiver apparatus, or similarly. Optionally, a component configured to implement a receiving function in the transceiver unit 801 can be considered a receiving unit, and a component configured to implement a The transmitting function in the 801 transceiver unit can be considered as a transmitting unit. In other words, the 801 transceiver unit includes both the receiving unit and the transmitting unit. For example, the receiving unit may also be called the receiving machine, receiver, receiving circuit, or similar. The transmitting unit may be called the transmitting machine, transmitter, transmitting circuit, or similar. Figure 21 is a schematic diagram of the structure of another terminal device 900 according to this application. In Figure 21, the terminal device includes a processor 910, a data transmission processor 920, and a data reception processor 930. The processing unit 620 in the above embodiment may be the processor 910 in Figure 21 and implements a corresponding function. The communications unit 610 in the above embodiment may be the data transmission processor 920 and / or the data reception processor 930 in Figure 21. Figure 21 shows a channel encoder and a channel decoder. However, it can be understood that these modules do not constitute a limitation of this embodiment but are merely illustrative. Figure 22 is a schematic diagram of a network device structure according to one embodiment of this application. The network device is configured to implement the network device operations (i.e., the sending device) described above. As shown in Figure 22, the network device includes an antenna 1001, a radio frequency apparatus 1002, and a baseband apparatus 1003. Antenna 1001 is connected to radio frequency apparatus 1002. In an uplink direction, radio frequency apparatus 1002 receives information sent by a terminal device via antenna 1001 and forwards this information to baseband apparatus 1003 for processing. In a downlink direction, baseband apparatus 1003 processes information from the terminal and forwards it to radio frequency apparatus 1002.Radio frequency device 1002 processes information about the terminal and then sends the processed information to the terminal via antenna 1001. The baseband apparatus 1003 may include one or more processing elements 10031, for example, a main control CPU and another integrated circuit. Furthermore, the baseband apparatus 1003 may also include a storage element 10032 and an interface 10033. The storage element 10032 is configured to store a program and data. The interface 10033 is configured to exchange information with the radio frequency apparatus 1002, and the interface is, for example, a common public radio interface (CPRI). The aforementioned apparatus used in the network device may be located in the baseband apparatus 1003. For example, the aforementioned apparatus used in the network device may be a chip in the baseband apparatus 1003. The chip includes at least one processing element and an interface circuit. The processing element is configured to perform steps in any method implemented by the network device. The interface circuit is configured to communicate with another device. In one implementation, the units in the network device that implement the steps in the above methods can be implemented in a program scheduling form using the processing element. For example, the device used in the network device includes a processing element and a storage element. The processing element invokes a program stored in the storage element to perform the method implemented by the network device in the above method.The storage element can be a storage element that is located on the same chip as the processing element, namely an on-chip storage element, or it can be a storage element that is located on a different chip than the processing element, namely an off-chip storage element. Optionally, in some other possible implementations of this application, for the combination of small RUs within a 242-tone RU, when a combination indication is 2 bits within a 20 MHz channel and the 2 bits are set to 00, it indicates that there is no combination of multiple RUs in a resource unit allocation form; that is, there is no multiple RU. When the 2 bits are set to 01, it indicates that a second 52-tone RU and a second 26-tone RU are combined into a multiple RU. Specifically, the second 52-tone RU and a left-hand 26-tone RU of the second 52-tone RU are combined into a multiple RU. For example, as shown in Fig. 23, the sorting is done in ascending order of frequency domains within the 20 MHz channel, and the 20 MHz channel can include nine 26-tone RUs. Alternatively, the 20 MHz channel can include four 52-tone RUs or two 106-tone RUs.The second 26-tone RU is located in the second of the nine 26-tone RUs, and the second 52-tone RU is located in the second of the four 52-tone RUs. In Fig. 23, a 26-tone RU marked as a first fill pattern in a first row is the second 26-tone RU mentioned earlier. A 52-tone RU marked as the first fill pattern in a second row is the second 52-tone RU mentioned earlier. Alternatively, when the 2 bits are set to 01, it indicates that a first 106-tone RU and a central 26-tone RU (i.e., a fifth 26-tone RU) within the 20 MHz channel are combined into a multiple RU. In Fig. 23, a 106-tone RU marked as a third fill pattern in a third row is the first 106-tone RU above, and a 26-tone RU marked as a second fill pattern in the first row is the fifth 26-tone RU above (the central 26-tone RU within the 20 MHz channel).23, RUs with the same filling pattern can be combined into a single multiple RU. When the 2 bits are set to 10, it indicates a third 52-tone RU and a The eighth 26-tone RU combines into a multiple RU. Specifically, the third 52-tone RU and a right-hand 26-tone RU of the third 52-tone RU combine into a multiple RU. The third 52-tone RU is located in the third of the four 52-tone RUs, and the eighth 26-tone RU is located in the eighth of the nine 26-tone RUs. As shown in Fig. 23, a 52-tone RU marked as the third fill pattern in the second row is the third 52-tone RU above, and a 26-tone RU marked as the third fill pattern in the first row is the eighth 26-tone RU above. Alternatively, when the 2 bits are set to 10, it indicates that a second 106-tone RU and a central 26-tone RU (i.e., a fifth 26-tone RU) within the 20 MHz channel are combined into a multiple RU. In Fig. 23, a 106-tone RU labeled as a fourth fill pattern in the third row is the second 106-tone RU mentioned earlier, and the central 26-tone RU within the 20 MHz channel is a 26-tone RU labeled as the second fill pattern in the first row. When both bits are set to 11, it indicates that there is the combination of RU indicated by setting both bits to 01 and the combination of RU indicated by setting both bits to 10. It should be understood that, in this implementation of this request, the meanings indicated by the values ​​of the 2 bits can be interchanged. For example, the content indicated by setting the 2 bits to 01 can be exchanged with the content indicated by setting the 2 bits to 10, the content indicated by setting the 2 bits to 01 can be exchanged with the content indicated by setting the 2 bits to 11, or the content indicated by setting the 2 bits to 10 can be exchanged with the content indicated by setting the 2 bits to 11. In other words, the specific values ​​of the 2 bits in the preceding example should not constitute any limitation in this implementation of this request. When in a 40 MHz bandwidth, because the 40 MHz bandwidth is approximately equivalent to a replica of the 20 MHz channel subcarrier distribution, and as shown in Fig. 24, small RUs do not combine in the 20 MHz channel, combining can be done in each 20 MHz channel based on a combining indication and combining form shown in Fig. 23. Similarly, for bandwidths of 80 MHz, 160 MHz, and 320 MHz, small RUs are not combined in the 20 MHz channel. In each 20 MHz channel, combining can be done based on the combining indication and combining method shown in Fig. 23. In another implementation, the network device units that implement the steps of the previous methods can be configured as one or more processing elements. The processing elements are arranged in the baseband device. The processing element here can be an integrated circuit, for example, one or more ASICs, or ML / t / ZUZZ / U í UO JJ plus DSP, one or more FPGAs, or a combination of integrated circuit types. These integrated circuits can be integrated together to form a chip. The network device units that implement the steps in the above methods can be integrated together and implemented as a system-on-a-chip. For example, the baseband device includes the SoC chip, configured to implement the above method. The terminal device and the network device in the above embodiment of the device may correspond exactly to the receiving device or the sending device in the embodiment of the method, and a corresponding module or unit performs a corresponding step. For example, when the device is implemented in chip form, the receiving unit may be an interface circuit on the chip configured to receive a signal from another chip or device. The sending unit is an interface circuit on the device configured to send a signal to another device. For example, when the device is implemented in chip form, the sending unit is an interface circuit on the chip configured to send a signal from another chip or device. Implementing this request also provides a communications system. The communications system includes the aforementioned sending device and receiving device. An implementation of this application further provides a computer-readable medium configured to store computer program code. The computer program includes instructions used to perform the resource unit combination indication method in this implementation of the application compared to the previous implementation. The readable medium can be read-only memory (ROM) or random access memory (RAM). This is not limited in this implementation of the application. This request also provides a computer program product. The computer program product includes instructions. When the instructions are executed, a sending device and a receiving device are enabled to perform operations corresponding to the sending and receiving devices in the previous method. An embodiment of this application further provides a system chip. The system chip includes a processing unit and a communications unit. The processing unit can be, for example, a processor, and the communications unit can be, for example, an input / output interface, a pin, a circuit, or the like. The processing unit can execute computer instructions, such that the chip in the communications unit implements any method of indicating the combination of resource units provided in the preceding embodiment of this application. Optionally, the computer instructions are stored on a storage unit. Optionally, the storage unit is an on-chip storage unit, such as a register or cache. The storage unit can also be an off-chip storage unit, such as ROM, another type of static storage device that can store static information and instructions, or RAM, which is located outside the chip and in the terminal. The processor mentioned in any of the above descriptions can be a CPU, a microprocessor, an ASIO driver, or one or more integrated circuits used to control program execution using the resource unit combination indication method described above.The processing unit and storage unit can be decoupled, housed separately in different physical devices, and connected via wired or wireless connections to implement their respective functions, thus assisting the system chip in performing various tasks as described above. Alternatively, the processing unit and memory can be integrated into a single device. It can be understood that the memory in the implementations of this application can be volatile or non-volatile memory, or it can include both. Non-volatile memory can be ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable EPROM (EEPROM), or flash memory. Volatile memory can be RAM and is used as an external cache.There are a plurality of different types of RAM, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), double data rate synchronous dynamic RAM (DDR SDRAM), enhanced synchronous dynamic RAM (ESDRAM), synchronized link DRAM (SLDRAM), and direct rambus RAM (DR RAM). The terms system and network in this description may be used interchangeably. The term and / or in this description describes only an association relationship to describe associated objects and represents that three relationships can exist. For example, A and / or B can represent the following three cases: Only A exists, both A and B exist, and only B exists. Additionally, the character 7 in this description generally indicates an or relationship between associated objects. ML / t / ZUZZ / U í UO JJ The terms uplink and downlink in this application are used to describe the direction of data / information transmission in a specific scenario. For example, the uplink direction generally refers to the direction in which data / information is transmitted from a terminal to one side of the network, or the direction in which a distributed unit transmits data / information to a centralized unit, and the downlink generally refers to the direction in which data / information is transmitted from one side of the network to a terminal. Alternatively, in a transmission direction from the centralized unit to the distributed unit, uplink and downlink may be understood to simply describe the direction of data / information transmission, and a specific starting / ending device for data / information transmission is not restricted. In this application, names can be assigned to various objects such as messages, information, devices, network elements, systems, apparatus, actions, operations, procedures, and concepts. It is understood that these specific names do not constitute a limitation on the related objects; the assigned names may change based on factors such as scenario, context, or usage patterns. The technical meanings of the terms in this application should be understood primarily based on the functions and technical effects reflected by the terms in the technical solutions. In the embodiments of this application, unless otherwise stated or there is a logical conflict, the terms and / or descriptions between the different embodiments are consistent and may refer to each other, and the technical features in different embodiments may be combined on the basis of an internal logical relationship between them, to form a new embodiment. All or some of the methods in the implementations of this application may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the implementations, all or part of the implementations may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, the procedures or functions in the implementations of this application are generated, in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.Computer programs or instructions can be stored on a computer-readable storage medium, or they can be transmitted using a computer-readable storage medium. ML / t / ZUZZ / U í UO JJ computer can be any usable medium accessible by a computer, or a data storage device such as a server that integrates one or more usable media. An expert in the technique will clearly understand that, for the purpose of a brief and convenient description, for a detailed working process of the system, apparatus, and unit mentioned above, refer to the corresponding process in the implementation of the previous method. The details are not described again in this application. In the various embodiments provided in this application, it should be understood that the systems, devices, and methods described may be implemented in other ways. For example, the embodiments of devices described are merely examples. For example, the division into units is simply a division of logical function and may be a different division during actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some functions may be ignored or not executed. Furthermore, the mutual couplings, direct couplings, or communication connections shown or discussed may be implemented using various interfaces. Indirect couplings or communication connections between devices or units may be implemented electronically, mechanically, or otherwise. The foregoing description is merely a specific embodiment of this application, but it is not intended to limit the scope of protection of this application. Any variation or substitution readily conceivable by a person skilled in the art within the technical field disclosed herein shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A communications apparatus, characterized in that it comprises: a processing unit, configured to determine a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field, the signal field comprises one or more resource unit allocation subfields, the resource unit allocation subfield indicates a size and location of a multiple resource unit (multiple RU), the multiple RU comprises at least two resource units (RUs), and the resource unit allocation subfield comprises 9 bits; and a communications unit, configured to send the PPDU.

2. A communications apparatus, characterized in that it comprises: a communications unit, configured to receive a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field, the signal field comprises one or more resource unit allocation subfields, the resource unit allocation subfield indicates a size and location of a multiple resource unit (multiple RU), and the multiple RU comprises at least two resource units (RUs); and a processing unit, configured to determine the size and location of the multiple RU corresponding to the apparatus based on the PPDU.

3. The apparatus according to claim 1 or 2, characterized in that the multiple RU occupies at least one 20 MHz channel corresponding to the resource unit allocation subfield.

4. The apparatus according to any of claims 1 to 3, characterized in that a resource unit comprising the multiple RU is less than a 242-tone RU, or a resource unit comprising the multiple RU is greater than or equal to a 242-tone RU.

5. The apparatus according to any one of claims 1 to 4, characterized in that the multiple RU comprises a multiple RU, wherein the multiple RU comprises a 26-tone RU and a 52-tone RU; the multiple RU comprises a 26-tone RU and a 106-tone RU; the multiple RU comprises a 52-tone RU and a 106-tone RU; the multiple RU comprises a 242-tone RU and another 242-tone RU; the multiple RU comprises a 242-tone RU and a 484-tone RU; the multiple RU comprises a 242-tone RU, a 484-tone RU and a 996-tone RU; the multiple RU comprises three 996-tone RUs; or the multiple RU comprises a 484-tone RU and a 996-tone RU. ML / t / ZUZZ / U í UO Jó6. The apparatus according to any of claims 1 to 5, characterized in that the multiple RU comprises a multiple RU, wherein the multiple RU is located in the 20 MHz channel, wherein the 20 MHz channel comprises eight RU resource units, and in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 52-tone RU, a seventh RU is a 26-tone RU, an eighth RU is a 26-tone RU, and the multiple RU comprises the sixth RU and the seventh RU;The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the fifth RU and the sixth RU; The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the fifth RU and the sixth RU;The 20 MHz channel comprises six resource units (RUs), and in ascending frequency order, the first RU is a 52-tone RU, the second RU is a 52-tone RU, the third RU is a 26-tone RU, the fourth RU is a 52-tone RU, the fifth RU is a 26-tone RU, the sixth RU is a 26-tone RU, and the multiple RU comprises the fourth and fifth RUs; the 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, and the multiple RU comprises the third and fourth RUs;The 20 MHz channel comprises eight resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, an eighth RU is a 26-tone RU, and the multiple RU comprises the second RU and the third RU; The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU;The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the second RU and the third RU; The 20 MHz channel comprises six resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 106-tone RU, and the multiple RU comprises the second and third RUs; the 20 MHz channel comprises six resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 26-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, the sixth RU is a 106-tone RU, and the multiple RU comprises the fifth and sixth RUs;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 106-tone RU, and the multiple RU comprises the fourth and fifth RUs; The 20 MHz channel comprises four resource units (RUs), and in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 52-tone RU, a third RU is a 26-tone RU, a fourth RU is a 106-tone RU, and the multiple RU comprises the third RU and the fourth RU;The 20 MHz channel comprises three resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 106-tone RU, the third RU is a 26-tone RU, and the multiple RU comprises the second and third RUs; the 20 MHz channel comprises six resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 26-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, the sixth RU is a 26-tone RU, and the multiple RU comprises the first and second RUs; The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, and the multiple RU comprises the first RU and the second RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, and the multiple RU comprises the first and second RUs; the 20 MHz channel comprises four resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 52-tone RU, and the multiple RU comprises the first and second RUs; The 20 MHz channel comprises three resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 106-tone RU, and the multiple RU comprises the first RU and the second RU;or the 20 MHz channel comprises five resource units (RUs) and, in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 52-tone RU, a third RU is a 26-tone RU, a fourth RU is a 52-tone RU, a fifth RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU.; 7. The apparatus according to any of claims 1 to 4, characterized in that the multiple RU comprises two multiple RUs, wherein in the two multiple RUs, one multiple RU comprises a 26-tone RU and a 52-tone RU, and the other multiple RU comprises a 26-tone RU and a 106-tone RU; or each of the two multiple RUs comprises a 26-tone RU and a 52-tone RU.

8. The apparatus according to any of claims 1 to 4, or claim 7, characterized in that the multiple RU comprises two multiple RUs, and the two multiple RUs are located in the 20 MHz channel, wherein the 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, one of the two multiple RUs comprises the first RU and the second RU, and the other of the two multiple RUs comprises the third RU and the fourth RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 106-tone RU, one of the two multiple RUs comprises the second RU and the third RU, and the other of the two multiple RUs comprises the fourth RU and the fifth RU; or the 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, one of the two multiple RUs comprises the second RU and the third RU, and the other of the two multiple RUs comprises the fifth RU and the sixth RU.; 9. The apparatus according to any of claims 1 to 4, characterized in that the multiple RU comprises three multiple RUs, and each of the three multiple RUs comprises a 26-tone RU and a 52-tone RU.

10. The apparatus according to any of claims 1 to 9, characterized in that the signal field further comprises at least one user field, a sequence of the at least one user field corresponding to a sequence of a resource unit allocation indicated by the one or more resource unit allocation subfields.

11. The apparatus according to any of claims 1 to 10, characterized in that at least two RUs included in the multiple RU are not adjacent to each other.

12. The apparatus according to any of claims 1 to 10, characterized in that any two RUs included in the multiple RU are adjacent to each other.

13. The apparatus according to any of claims 1 to 12, characterized in that the signal field comprises a combination indication, and the combination indication indicates the size and location of the multiple RU; and the combination indication is comprised in the resource unit allocation subfield; or the signal field further comprises a multiple resource unit allocation field, and the multiple resource unit allocation field comprises the combination indication.

14. A method for indicating a combination of resource units, characterized in that it comprises: determining a physical layer protocol data unit PPDU, wherein the PPDU comprises a signal field, the signal field comprises one or more resource unit allocation subfields, the resource unit allocation subfield indicates a size and location of a multiple resource unit (multiple RU), the multiple RU comprises at least two resource unit RUs, and the resource unit allocation subfield comprises 9 bits; and sending the PPDU.

15. A method of indicating the combination of resource units, characterized in that it comprises: receiving a physical layer protocol data unit PPDU, wherein the PPDU comprises a signal field, the signal field comprises one or more resource unit allocation subfields, the resource unit allocation subfield indicates a size and location of a multiple resource unit (MR), and the MR comprises at least two MRs of resource units; and determining the size and location of the MR corresponding to the apparatus based on the PPDU.

16. The apparatus according to claim 14 or 15, characterized in that the signal field further comprises at least one user field, a sequence of the at least one user field corresponds to a sequence of a resource unit allocation indicated by one or more resource unit allocation subfields.

17. The method according to any of claims 14 to 16, characterized in that the multiple RU occupies at least one 20 MHz channel corresponding to the resource unit allocation subfield.

18. The method according to any of claims 14 to 17, characterized in that a resource unit comprising the multiple RU is less than a 242-tone RU, or a resource unit comprising the multiple RU is greater than or equal to a 242-tone RU.

19. The method according to any of claims 14 to 18, characterized in that the multiple RU comprises a multiple RU, wherein the multiple RU comprises a 26-tone RU and a 52-tone RU; the multiple RU comprises a 26-tone RU and a 106-tone RU; the multiple RU comprises a 52-tone RU and a 106-tone RU; the multiple RU comprises a 242-tone RU and another 242-tone RU; the multiple RU comprises a 242-tone RU and a 484-tone RU; the multiple RU comprises a 242-tone RU, a 484-tone RU, and a 996-tone RU; the multiple RU comprises three 996-tone RUs; or the multiple RU comprises a 484-tone RU and a 996-tone RU.

20. The method in conformity with any of 14 to 19, characterized in that the multiple RU comprises a multiple RU, wherein the multiple RU is located in the 20 MHz channel, wherein the 20 MHz channel comprises eight resource units (RUs), and in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 52-tone RU, a seventh RU is a 26-tone RU, an eighth RU is a 26-tone RU, and the multiple RU comprises the sixth RU and the seventh RU;The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the fifth RU and the sixth RU; The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the fifth RU and the sixth RU;The 20 MHz channel comprises six resource units (RUs), and in ascending frequency order, the first RU is a 52-tone RU, the second RU is a 52-tone RU, the third RU is a 26-tone RU, the fourth RU is a 52-tone RU, the fifth RU is a 26-tone RU, the sixth RU is a 26-tone RU, and the multiple RU comprises the fourth and fifth RUs; the 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, and the multiple RU comprises the third and fourth RUs;The 20 MHz channel comprises eight resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, an eighth RU is a 26-tone RU, and the multiple RU comprises the second RU and the third RU; The 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU;The 20 MHz channel comprises seven resource units (RUs), and in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, and the multiple RU comprises the second RU and the third RU; The 20 MHz channel comprises six resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 106-tone RU, and the multiple RU comprises the second and third RUs; the 20 MHz channel comprises six resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 26-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 26-tone RU, the sixth RU is a 106-tone RU, and the multiple RU comprises the fifth and sixth RUs;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 26-tone RU, the second RU is a 26-tone RU, the third RU is a 52-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 106-tone RU, and the multiple RU comprises the fourth and fifth RUs; The 20 MHz channel comprises four resource units (RUs), and in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 52-tone RU, a third RU is a 26-tone RU, a fourth RU is a 106-tone RU, and the multiple RU comprises the third RU and the fourth RU;The 20 MHz channel comprises three RU resource units and, in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 106-tone RU, a third RU is a 26-tone RU, and the multiple RU comprises the second RU and the third RU; ML / t / ZUZZ / U í UO JJ the 20 MHz channel comprises six RU resource units and, in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 26-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, a sixth RU is a 26-tone RU, and the multiple RU comprises the first RU and the second RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, the first RU is a 106-tone RU, the second RU is a 26-tone RU, the third RU is a 26-tone RU, the fourth RU is a 26-tone RU, the fifth RU is a 52-tone RU, and the multiple RU comprises the first and second RUs; The 20 MHz channel comprises four resource units (RUs), and in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 52-tone RU, and the multiple RU comprises the first RU and the second RU;The 20 MHz channel comprises three resource units (RUs) and, in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 106-tone RU, and the multiple RU comprises the first RU and the second RU; or the 20 MHz channel comprises five resource units (RUs) and, in ascending frequency order, a first RU is a 52-tone RU, a second RU is a 52-tone RU, a third RU is a 26-tone RU, a fourth RU is a 52-tone RU, a fifth RU is a 52-tone RU, and the multiple RU comprises the second RU and the third RU.

21. The method according to any of claims 14 to 18, characterized in that the multiple RU comprises two multiple RUs, wherein in the two multiple RUs, one multiple RU comprises a 26-tone RU and a 52-tone RU, and the other multiple RU comprises a 26-tone RU and a 106-tone RU; or each of the two multiple RUs comprises a 26-tone RU and a 52-tone RU.

22. The method according to any of claims 14 to 18, or claim 19, characterized in that the multiple RU comprises two multiple RUs, and the two multiple RUs are located in the 20 MHz channel, wherein the 20 MHz channel comprises five RU resource units, and in ascending frequency order, a first RU is a 106-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 26-tone RU, one of the two multiple RUs comprises the first RU and the second RU, and the other of the two multiple RUs comprises the third RU and the fourth RU;The 20 MHz channel comprises five resource units (RUs), and in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 106-tone RU, one of the two multiple RUs comprises the second RU and the third RU, and the other of the two multiple RUs comprises the fourth RU and the fifth RU; or the 20 MHz channel comprises seven resource units (RUs) and, in ascending frequency order, a first RU is a 26-tone RU, a second RU is a 26-tone RU, a third RU is a 52-tone RU, a fourth RU is a 26-tone RU, a fifth RU is a 52-tone RU, a sixth RU is a 26-tone RU, a seventh RU is a 26-tone RU, one of the two multiple RUs comprises the second RU and the third RU, and the other of the two multiple RUs comprises the fifth RU and the sixth RU.; 23. The method according to any of claims 14 to 18, characterized in that the multiple RU comprises three multiple RUs, and each of the three multiple RUs comprises a 26-tone RU and a 52-tone RU.

24. The method according to any of claims 14 to 23, characterized in that at least two RUs included in the multiple RU are not adjacent to each other.

25. The method in accordance with any of claims 14 to 238, characterized in that any two RUs included in the multiple RU are adjacent to each other.

26. The method according to any of claims 14 to 25, characterized in that the signal field comprises a combination indication, and the combination indication indicates the size and location of the multiple RU; and the combination indication is comprised in the resource unit allocation subfield; or the signal field further comprises a multiple resource unit allocation field, and the multiple resource unit allocation field comprises the combination indication.

27. A communications apparatus, characterized in that it comprises at least one processor and an interface circuit, wherein the at least one processor is configured to perform the method according to any of claims 14 to 26.

28. A communications apparatus, characterized in that it comprises at least one processor and a memory, wherein the memory is configured to store a computer program and data, and the at least one processor is configured to perform the method according to any of claims 14 to 26.

29. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program, and when the program is executed by a processor, the method is performed in accordance with any of claims 14 to 26.

30. A communications system, characterized in that the communications system comprises the apparatus according to claim 1 or any of claims 3 to 13, and the apparatus according to any of claims 2 to 13.

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