Communication method and communication device

Abstract

Provided are a communication method and a communication device. The method comprises: a first device receives a first PPDU.

Description

Communication methods and communication equipment Technical Field

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

[0002] With the development of communication technology, new types of equipment have gradually emerged, such as ambient powered (AMP) devices. How to define the fields in the physical layer protocol data unit (PPDU) of such devices is a problem that needs to be solved. Summary of the Invention

[0003] This application provides a communication method and a communication device. The various aspects covered by this application are described below.

[0004] In a first aspect, a communication method is provided, comprising: a first device receiving a first PPDU.

[0005] In a second aspect, a communication method is provided, comprising: a second device sending a first PPDU.

[0006] Thirdly, a communication device is provided, the communication device being a first device, the communication device comprising: a communication unit for receiving a first PPDU.

[0007] Fourthly, a communication device is provided, the communication device including a second device, the communication device including: a communication unit for transmitting a first PPDU.

[0008] Fifthly, a communication device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, the processor is used to invoke the program in the memory, and to control the transceiver to receive or transmit signals, so that the communication device performs the method as described in the first or second aspect.

[0009] A sixth aspect provides an apparatus including a processor for calling a program from a memory to cause the apparatus to perform the method as described in the first or second aspect.

[0010] A seventh aspect provides a chip including a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in the first or second aspect.

[0011] Eighthly, a computer-readable storage medium is provided having a program stored thereon that causes a computer to perform the method as described in the first or second aspect.

[0012] Ninth aspect, a computer program product is provided, including a program that causes a computer to perform the method as described in the first or second aspect.

[0013] In a tenth aspect, a computer program is provided that causes a computer to perform the method as described in the first or second aspect. Attached Figure Description

[0014] Figure 1 is an example diagram of a wireless communication system to which embodiments of this application can be applied.

[0015] Figure 2 is a structural example diagram of an AMP device.

[0016] Figure 3 is a structural example of the energy harvesting module in Figure 2.

[0017] Figure 4 is an example diagram of the backscatter communication process of an AMP device.

[0018] Figure 5 shows an example of the encoding method for AMP devices.

[0019] Figure 6 shows an example diagram of the preamble format of PPDU.

[0020] Figure 7A shows an example of the format of the U-SIG field.

[0021] Figure 7B shows another example of the format of the U-SIG field.

[0022] Figure 8 shows an example diagram of another format of PPDU.

[0023] Figure 9A shows an example of the format of a business field.

[0024] Figure 9B shows another example of the format of a business field.

[0025] Figure 10 is a flowchart illustrating the communication method provided in an embodiment of this application.

[0026] Figure 11 is a flowchart illustrating a communication device provided in an embodiment of this application.

[0027] Figure 12 is a structural example diagram of the communication device provided in an embodiment of this application.

[0028] Figure 13 is a schematic structural diagram of a device applicable to embodiments of this application. Detailed Implementation

[0029] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0030] Communication system

[0031] The technical solutions of this application embodiment can be applied to various communication systems, such as wireless local area networks (WLAN), wireless fidelity (WiFi), or other communication systems.

[0032] Figure 1 illustrates a wireless communication system 100 used in an embodiment of this application. The wireless communication system 100 may include an access point (AP) 110 and a station (STA) 120 that accesses the network through the AP 110.

[0033] In some scenarios, AP is also called AP STA, meaning that in a certain sense, AP is also a type of STA.

[0034] In some scenarios, STA is also called non-AP STA.

[0035] Communication in communication system 100 can be communication between AP and STA, communication between STA and STA, or communication between STA and peer STA. A peer STA can refer to a device that communicates with the STA; for example, a peer STA may be an AP or a STA.

[0036] An access point (AP) acts as a bridge between wired and wireless networks, primarily connecting various wireless network clients together and then connecting the wireless network to the Ethernet. AP devices can be terminal devices with WiFi chips (such as mobile phones) or network devices (such as routers).

[0037] It should be understood that the roles of the various communication devices in the communication system 100 are not absolute. Taking a mobile phone as an example, in a scenario where the mobile phone is connected to a router, the mobile phone is a STA (Station); in a scenario where the mobile phone acts as a hotspot for other mobile phones, the mobile phone acts as an AP (Access Point).

[0038] AP and STA can be devices used in vehicle networking, IoT nodes and sensors in the Internet of Things (IoT), smart cameras, smart remote controls, smart water and electricity meters in smart homes, and sensors in smart cities.

[0039] In some embodiments, both the STA and AP can support the 802.11be standard. The STA or AP can also support various current and future 802.11 family WLAN standards such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

[0040] One or more links exist between the STA and the AP. In some embodiments, the STA and AP support multi-band communication. For example, the STA and AP can communicate simultaneously on the 2.4 GHz, 5 GHz, 6 GHz, 45 GHz, and 60 GHz bands, or simultaneously on different channels within the same (or different) bands, to improve communication throughput and / or reliability between devices. Such devices are commonly referred to as multi-band devices, or multi-link devices (MLDs), and sometimes also as multi-link entities or multi-band entities. A multi-link device can be an access point device or a site device. If the multi-link device is an access point device, it can contain one or more APs; if the multi-link device is a site device, it can contain one or more non-AP STAs.

[0041] A multi-link device that includes one or more access points (APs) can be called an access point multi-link device (AP MLD), and a multi-link device that includes one or more non-AP STAs can be called a non-access point multi-link device (non-AP MLD).

[0042] In this embodiment of the application, the AP may include multiple APs, and the non-AP STA may include multiple STAs. Multiple links may be formed between the multiple APs and the multiple STAs, and data communication may be performed between the multiple APs and the multiple STAs through the corresponding links.

[0043] In the embodiments of this application, STA can be a mobile phone, tablet computer, laptop computer, handheld computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc., that supports WLAN / WiFi technology.

[0044] WLAN technology can support frequency bands including but not limited to: low frequency bands (e.g., 2.4GHz, 5GHz, 6GHz) and high frequency bands (e.g., 45GHz, 60GHz).

[0045] Figure 1 exemplarily illustrates one AP and two STAs. Optionally, the communication system 100 may include multiple APs and other numbers of STAs, which is not limited in this embodiment. In Figure 1, AP, STA 120a, and STA 120b may reside in the same basic service set (BSS). AP may be associated with STA 120a. AP may be associated with STA 120b.

[0046] It should be understood that in the embodiments of this application, devices with communication functions in the network / system can be referred to as communication devices. Taking the communication system 100 shown in FIG1 as an example, the communication devices may include AP 110 and STA 120 with communication functions. In addition, the communication devices mentioned in the embodiments of this application may also include other devices in the communication system 100, such as network controllers, gateways and other network entities (not shown in FIG1), which are not limited in the embodiments of this application.

[0047] APs and STAs can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on aircraft, balloons, and satellites. This application does not limit the scenarios in which the APs and STAs are located.

[0048] It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0049] Channel access and WUR technology

[0050] In WiFi, channel access is based on the listen-before-talk (LBT) principle. Related technologies (such as Mustafa Ergen, “IEEE 802.11 Tutorial,” Jun. 2002) provide a variety of channel access mechanisms.

[0051] 802.11ba introduced wake-up signal (WUS) technology. Due to the limited processing power of WUS devices, when operating in the 2.4 GHz band, a 20 MHz bandwidth legacy preamble can be transmitted on the channel, followed by a 4 MHz bandwidth WUS frame. For an introduction to WUS technology, see, for example, "Steve Shellhammer, Alfred Asterjadhi, and Yanjun Sun, IEEE 802.11ba Ultra-Low Power Wake-up Radio Standard, Wiley 2022". Furthermore, to enable the AP to process more non-AP WUS STAs simultaneously, Frequency Division Multiple Access (FDMA) technology was proposed. In FDMA, N (N is an integer greater than 1) 20 MHz channels are used simultaneously, allowing the AP to process N times the number of non-AP WUS STAs.

[0052] AMP devices

[0053] With the development of wireless communication technology, there is a growing desire to integrate wireless communication systems with various vertical industries such as logistics, manufacturing, transportation, and energy. For example, wireless communication systems can be integrated with industrial wireless sensor networks (IWSNs). They can also be integrated with smart logistics and smart warehousing. Furthermore, they can be integrated with smart home networks.

[0054] However, in these industries, communication equipment typically needs to be characterized by low cost, small size (e.g., ultra-thin), maintenance-free operation, and long lifespan. Therefore, to meet these requirements, zero-power communication technology can be used. In this scenario, the STA 120 mentioned earlier can be referred to as a "zero-power device" or "AMP device."

[0055] The following section, in conjunction with Figure 2, introduces zero-power communication technology and AMP devices.

[0056] As shown in Figure 2, the AMP device 210 supporting zero-power communication technology may include an energy harvesting module 211 and a backscatter communication module 212. In some cases, the AMP device 210 may also include a low-power computing module 213. The low-power computing module 213 can be used to provide computing functions for the AMP device 210, such as data processing. In other cases, the AMP device 210 may also include a sensor 214 for collecting external information (e.g., ambient temperature, ambient humidity, etc.). In still other cases, the AMP device 210 may also include a memory 215 for storing information (e.g., external information collected by the aforementioned sensors, or such as object identification).

[0057] The energy harvesting module 211 described above is used to harvest energy. In some implementations, energy can be harvested via a power supply signal sent by other devices or via the external environment. The power supply signal can be a radio frequency (RF) signal sent by a network device; therefore, the energy harvesting module described above can be a "radio frequency energy harvesting module".

[0058] Figure 3 illustrates one possible structure of the energy harvesting module 211. As shown in Figure 3, the energy harvesting module 211 can harvest the energy of spatial electromagnetic waves from radio frequency signals based on the principle of electromagnetic induction, and store the harvested energy in capacitor C, which is the charging process of capacitor C. After the charging process of capacitor C is completed, capacitor C can begin to discharge to power the AMP device. For example, the discharge of capacitor C can be used to drive the AMP device to perform low-power demodulation of data transmitted by other devices. Alternatively, the discharge of capacitor C can be used to drive the AMP device to modulate the data to be transmitted. Another example is that the discharge of capacitor C can be used to drive the sensors of the AMP device to acquire data. Yet another example is that the discharge of capacitor C can be used to drive the AMP device to read data from memory 215, etc.

[0059] The principle of backscatter communication is explained below with reference to Figure 4. Referring to Figure 4, the AMP device 210 receives a wireless signal sent by another device and modulates the signal to load the data to be transmitted. Then, the AMP device 210 radiates the modulated signal from its antenna; this information transmission process is called backscatter communication. The aforementioned wireless signal can also be called a carrier signal. A carrier signal can refer to an unmodulated wireless signal. For example, a carrier signal can be a sine wave signal. Backscatter communication and load modulation are inseparable. Load modulation can be understood as adjusting and controlling the circuit parameters of the AMP device's oscillation circuit according to the data flow rhythm, thereby changing parameters such as the impedance of the AMP device and completing the modulation process.

[0060] In some implementations, the AMP device 210 may include an energy harvesting module. The energy harvesting module can be used to harvest any type of signal from the environment. For example, the energy harvesting module can be used to harvest power supply signals sent by other devices or energy from the environment. This application does not specifically limit the form of the power supply signal. For example, the power supply signal can be a modulated wireless signal or an unmodulated wireless signal. A carrier signal as described above can also be used as a power supply signal. Furthermore, the power supply signal can also be a wireless signal of any waveform, such as a sine wave, a square wave, etc.

[0061] In some implementations, the AMP device 210 may also include a logic processing unit to perform corresponding computational functions.

[0062] Typically, load modulation can be achieved through two methods: resistive load modulation and capacitive load modulation. Figure 5 shows the circuit diagram of an AMP device based on resistive load modulation technology. In resistive load modulation, a resistor RL can be connected in parallel with the load. The switch S can be controlled based on binary data stream to turn the resistor RL on or off. Thus, the switching of the resistor RL causes a change in the circuit voltage, and this change in circuit voltage can control the amplitude of the backscattered signal of the AMP device, thereby achieving modulation of the backscattered signal, i.e., amplitude-shift keying (ASK) modulation of the backscattered signal.

[0063] Similarly, in capacitive load modulation, the switching of the capacitor can be controlled based on the binary data stream to change the circuit resonant frequency, thereby changing the operating frequency of the backscattered signal to achieve frequency-shift keying (FSK) modulation.

[0064] As mentioned earlier, with the development of communication technology, some new types of equipment have gradually emerged, such as ambient powered (AMP) devices. How to define the fields in the PPDU of such devices (hereinafter referred to as the first PPDU) – that is, what information the fields in the PPDU should provide – is a problem that needs to be solved.

[0065] The first PPDU can be a PPDU for an AMP device. In some embodiments, the first PPDU can be referred to as an AMP PPDU or an 802.11bp PPDU. The AMP device mentioned here can be an active transmit AMP device (Tx AMP) or an AMP-enabled device.

[0066] The first PPDU may include a preamble. This application does not specifically limit the number or format of the preamble in its embodiments.

[0067] In some embodiments, the first PPDU may employ a preamble similar to that defined in 802.11be. This preamble may include one or more of the following fields: L-SIG, L-LTF, L-SIG, RL-SIG, and U-SIG. For example, Figure 6 shows an example of a preamble format for the first PPDU, which includes the L-SIG, L-LTF, L-SIG, RL-SIG, and U-SIG fields.

[0068] In some embodiments, the preamble of the first PPDU can be a preamble similar to that defined in 802.11b. The preamble defined in 802.11b is a Physical Layer Convergence Protocol (PLCP) preamble, which includes one or more of the synchronization (SYNC) field and the start frame delimiter (SFD) field. Alternatively, the preamble of the first PPDU can support multiple preamble formats, such as simultaneously supporting preambles similar to those defined in 802.11be and those defined in 802.11b.

[0069] The following example illustrates in detail the configuration of the first PPDU or its preamble-related fields, using a preamble similar to that defined in 802.11be as an example.

[0070] In some embodiments, the first PPDU or the preamble of the first PPDU includes an L-SIG field. The L-SIG field includes one or more of the following: a Rate field, a Length field, a Reserved field, a Parity field, and a Tail field.

[0071] In some embodiments, the L-SIG field includes a rate field. The rate indicated by the rate field can be the lowest rate among the optional rates in the rate field. For example, the L-SIG field indicates MCS0 or the rate corresponding to MCS0.

[0072] In other implementations, the rate field in the L-SIG field may indicate a rate that is not supported by a communication device capable of recognizing the rate field. In this case, the communication device capable of recognizing the rate field (a conventional communication device) may stop receiving the first PPDU.

[0073] In some embodiments, the L-SIG field includes a length field. The value of the length field matches the duration of the first PPDU. Alternatively, the value of the length field matches the length of the first PPDU. Or, the value of the length field indicates the duration or length of the first PPDU.

[0074] In other embodiments, the first PPDU includes one or more excitation fields. The excitation fields can be used to provide power to a receiving device (such as an AMP device) of the first PPDU to support backscatter transmission of that receiving device. In this case, the value of the length field can be matched with the duration of a downlink field in the first PPDU other than the excitation field. Alternatively, the value of the length field can be matched with the duration of a downlink portion in the first PPDU. Alternatively, the value of the length field can be matched with the length of a downlink field in the first PPDU other than the excitation field. Alternatively, the value of the length field can be matched with the length of a downlink portion in the first PPDU. Alternatively, the value of the length field indicates the duration or length of a downlink field in the first PPDU other than the excitation field. Alternatively, the value of the length field indicates the duration or length of a downlink portion in the first PPDU.

[0075] In some embodiments, the L-SIG field includes a reserved field. The value of the reserved field can be a default value (e.g., 0). Alternatively, the value of the reserved field can be a non-default value (e.g., the value of the reserved field is 1). If the value of the reserved field is not a default value, a communication device (traditional communication device) capable of recognizing the reserved field can stop receiving the first PPDU.

[0076] In some embodiments, the L-SIG field includes a parity field. This parity field can be used to provide verification information. The meaning of the parity field can be found in related technologies.

[0077] In some embodiments, the L-SIG field includes a tail field. In related technologies, the default value of each bit in the tail field is 0. In the embodiments of this application, one or more bits of the tail field are not 0, thereby instructing a communication device (conventional communication device) capable of detecting the tail field to stop receiving the first PPDU.

[0078] As mentioned earlier, the first PPDU or its preamble may include an L-SIG field and an RL-SIG field. In related technologies (such as 802.11be and 802.11bn), the RL-SIG field is a repetition of the L-SIG field, meaning that the L-SIG field and the RL-SIG field have the same value. In this embodiment, the RL-SIG field can be set to a field with a different value than the L-SIG field. For example, the value of the RL-SIG field is complementary to the value of the L-SIG field. For instance, if the first bit of the RL-SIG field is 0, then the first bit of the L-SIG field is 1. Setting the RL-SIG field and the L-SIG field to have different values ​​helps communication devices (traditional communication devices) that can detect the RL-SIG field to stop receiving the first PPDU.

[0079] As mentioned earlier, the first PPDU or its preamble may include a U-SIG field. The U-SIG field may include two symbols (such as OFDM symbols). The duration of each symbol may be, for example, 8 microseconds, or other durations. This application does not specifically limit the format of the U-SIG field. The U-SIG field may include, for example, one or more of the following: Version field, Bandwidth field, Validate field, Uplink / Downlink (UL / DL) field, TXOP field, Disregard field, and EHT-SIG field.

[0080] The format of the U-SIG field can refer to the design of the U-SIG field in 802.11be. The U-SIG field in 802.11be includes two formats: one for EHT MU PPDU and the other for EHT TB PPDU. For example, the format of the U-SIG field provided in this embodiment can refer to the format of the U-SIG field for EHT MU PPDU, as shown in Figure 7A. Similarly, the format of the U-SIG field provided in this embodiment can refer to the format of the U-SIG field for EHT TB PPDU, as shown in Figure 7B. The specific configuration methods of each field in the U-SIG field are illustrated in detail below.

[0081] In some embodiments, the U-SIG field may include one or more valid fields. The value of these valid fields may be a default value (e.g., 1) or a non-default value (e.g., 0). In some embodiments, the first valid field in the U-SIG field may not have a default value (e.g., 0), allowing the communication device (traditional communication device) capable of recognizing this field to stop detecting the first PPDU as early as possible. In other embodiments, the values ​​of all valid fields in the U-SIG field may not have default values ​​(e.g., 0). Alternatively, the values ​​of the valid fields in the U-SIG field may be set according to the useful information that the communication device (traditional communication device) capable of detecting the U-SIG field needs to obtain. For example, as shown in Figure 7A, if the last valid field among the three valid fields has a non-default value, and the first two fields have default values, then the traditional communication device can stop receiving the first PPDU after receiving the Punctured Channel Info field. As a specific example, the U-SIG field includes three valid fields arranged in sequence, with values ​​of 110, 100, or 000. Alternatively, the values ​​of the three valid fields can be complementary to the values ​​mentioned above, i.e., 001, 011, or 111.

[0082] In some embodiments, the U-SIG field includes a version field, and the value of the version field can be from 1 to 7 (e.g., 3 to 7). In related technologies, a version field value of 0 represents 802.11be. If the version field value is from 1 to 7 (e.g., 3 to 7), then a communication device (e.g., a conventional communication device) capable of detecting this version field can stop receiving the first PPDU. Further, the U-SIG field may include one or more valid fields and a version field, the value of the one or more valid fields can be a default value (e.g., 1), and the value of the version field can be from 1 to 7 (e.g., 3 to 7).

[0083] In some embodiments, the U-SIG field includes a bandwidth field, and the value of the bandwidth field can be 5, 6, or 7. In related technologies, the value of the bandwidth field is 0-4. If the value of the bandwidth field can be 5, 6, or 7, then a communication device (such as a conventional communication device) capable of detecting the bandwidth field can stop receiving the first PPDU. Further, the U-SIG field may include one or more valid fields, a version field, and a version field, wherein the value of the one or more valid fields can be a default value (such as 1), the value of the version field can be 0, and the value of the bandwidth field can be 5, 6, or 7.

[0084] In some embodiments, the U-SIG field includes an uplink / downlink field. This uplink / downlink field can indicate downlink transmission. Alternatively, the uplink / downlink field can indicate different transmission types depending on the circumstances. For example, if the first PPDU does not include an excitation field, the uplink / downlink field indicates downlink transmission; and / or, if the first PPDU includes an excitation field, the uplink / downlink field can indicate either uplink or downlink transmission.

[0085] In some embodiments, the U-SIG field includes a TXOP field, and the TXOP field can be configured in several ways. Several examples are given below.

[0086] For example, the value of the TXOP field can be the maximum value in the range of TXOP values ​​(e.g., 8449). Alternatively, the TXOP field can specify the duration for which TXOP is not performed. Or, if the TXOP field is set to the maximum value, then that maximum value represents the TXOP field not indicating the duration of TXOP.

[0087] For example, the value of the TXOP field matches the duration of the first PPDU. In other words, the value of the TXOP field indicates the duration of the first PPDU.

[0088] For example, the value of the TXOP field matches the remaining duration of the first PPDU. Or, the value of the TXOP field indicates the remaining duration of the first PPDU.

[0089] In some embodiments, the U-SIG field includes a discard field. The value of the discard field can be a default value (e.g., all bits of the discard field are set to 1). For example, some embodiments described above change the value of the field so that conventional communication devices can distinguish the first PPDU from conventional PPDUs. In such embodiments, the value of the discard field can remain at its default value. Alternatively, the value of the discard field can be a non-default value (e.g., at least one bit in the discard field is set to 0). In this way, a communication device capable of detecting the discard field (e.g., a conventional communication device) can stop receiving the first PPDU after detecting the discard field.

[0090] In some embodiments, the U-SIG field includes an EHT-SIG field (the EHT-SIG field may occupy 0 or 1 symbols). The EHT-SIG field may contain a rate indication field. The rate indicated by the EHT-SIG field is the lowest among the selectable rates. For example, the EHT-SIG field indicates MCS0 or the rate corresponding to MCS0. Alternatively, the EHT-SIG field indicates a rate that is not supported by a communication device capable of recognizing the EHT-SIG field. In this way, a communication device capable of detecting the EHT-SIG field (such as a conventional communication device) can stop receiving the first PPDU after detecting the EHT-SIG field.

[0091] In addition to the fields mentioned above, the leading field of the first PPDU also includes other fields. In this embodiment of the application, the setting method of other fields is not specifically limited. They can be set to default values ​​or random values.

[0092] As mentioned in some of the preceding embodiments, the preamble of the first PPDU can adopt a preamble similar to that defined in 802.11b. If the preamble of the first PPDU adopts this design, the first PPDU may also include a PLCP header field. This PLCP header field includes one or more of a signal field, a service field, and a length field. For example, as shown in FIG8, the first PPDU includes a PLCP preamble, a PLCP header field, and an MPDU. The PLCP preamble includes a SYNC field and an SDF field. The PLCP header field includes a SIGNAL field, a SERVICE field, a LENGHT field, and a CRC field.

[0093] In some embodiments, the PLCP header field of the first PPDU may include a signal field. This signal field may indicate a rate, and the rate may be the lowest among selectable rates (predefined rates by the protocol), such as 00001010. Alternatively, the rate indicated by the signal field may be a rate not supported by a communication device capable of recognizing the signal field (e.g., 3 Mbps, 00011110), in which case a communication device capable of recognizing the signal field (a conventional communication device) may stop receiving the first PPDU after detecting the signal field.

[0094] In some embodiments, the PLCP header field of the first PPDU may include a service field. The bits in this service field are all 0. Alternatively, the bits in this service field are all 1.

[0095] Alternatively, in some embodiments, the format of the service field may differ from the format of service fields defined in 802.11b or 802.11g. For example, Figures 9A and 9B illustrate the formats of service fields defined in 802.11b and 802.11g, respectively. For instance, the service field may carry information related to AMP devices or 802.11bp. Exemplarily, referring to Figure 9A, information related to AMP devices or 802.11bp may be indicated based on one or more of fields b0, b1, and b4 in the service field.

[0096] In some embodiments, the PLCP header field of the first PPDU may include a length field. The value of the length field matches the duration of the first PPDU. Alternatively, the value of the length field matches the length of the first PPDU. Or, the value of the length field indicates the duration or length of the first PPDU.

[0097] Alternatively, in some embodiments, the value of the length field matches the duration of the downlink field of the first PPDU excluding the stimulus field. In other words, the value of the length field matches the length of the downlink field of the first PPDU excluding the stimulus field. Or, the value of the length field indicates the duration or length of the downlink field of the first PPDU excluding the stimulus field.

[0098] As shown in Figure 10, the first PPDU mentioned above can be a PPDU sent from the second device to the first device (see step S1010 in Figure 10). The first device can be an AMP device. For example, the first device can be an active transmission-based AMP device (Tx AMP) or an AMP-enabled device. The second device can be an access point (AP). Alternatively, the second device can be the power supply device for the first device.

[0099] The method embodiments of this application have been described in detail above with reference to Figures 1 to 10. The apparatus embodiments of this application will be described in detail below with reference to Figures 11 to 13. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments.

[0100] Figure 11 is a schematic diagram of a communication device provided in an embodiment of this application. The communication device 1100 shown in Figure 11 may include a communication unit 1110. The communication unit 1110 is used to receive a first PPDU.

[0101] In some embodiments, the first PPDU includes a conventional signal L-SIG field, which includes one or more of the following: a rate field, a length field, a reserved field, and a tail field.

[0102] In some embodiments, the rate field indicates the lowest rate among the selectable rates of the rate field; or, the rate field indicates a rate that is not supported by a communication device capable of recognizing the rate field.

[0103] In some embodiments, the value of the length field matches the duration of the first PPDU; or, the value of the length field matches the duration of the downlink field in the first PPDU, excluding the excitation field.

[0104] In some embodiments, the value of the reserved field is a default value; or, the value of the reserved field is not a default value.

[0105] In some embodiments, one or more bits of the tail field are not 0.

[0106] In some embodiments, the first PPDU includes an L-SIG field and a repeating conventional signal RL-SIG field, wherein the values ​​of the L-SIG field and the RL-SIG field are different.

[0107] In some embodiments, the value of the RL-SIG field is complementary to the value of the L-SIG field.

[0108] In some embodiments, the first PPDU includes a general signal U-SIG field, which includes one or more of the following: version field, bandwidth field, valid field, uplink / downlink field, transmission opportunity TXOP field, drop field, and ultra-high throughput EHT-SIG field.

[0109] In some embodiments, the values ​​of one or more valid fields in the U-SIG field are not default values.

[0110] In some embodiments, the U-SIG field includes three valid fields arranged in sequence, wherein the values ​​of the three valid fields are the following values ​​or complementary values ​​of the following values: 110, 100 or 000.

[0111] In some embodiments, the version field takes the value 3 to 7.

[0112] In some embodiments, the bandwidth field takes the value 6 or 7.

[0113] In some embodiments, if the first PPDU does not include an excitation field, the uplink / downlink field indicates downlink transmission; and / or, if the first PPDU includes an excitation field, the uplink / downlink field indicates uplink transmission.

[0114] In some embodiments, the value of the TXOP field is the maximum value in the range of TXOP values; or, the value of the TXOP field matches the duration of the first PPDU; or, the value of the TXOP field matches the remaining duration of the first PPDU.

[0115] In some embodiments, the value of the discard field is not a default value.

[0116] In some embodiments, the rate indicated by the EHT-SIG field is the lowest among the selectable rates; or, the rate indicated by the EHT-SIG field is a rate that is not supported by the communication device capable of recognizing the EHT-SIG field.

[0117] In some embodiments, the EHT-SIG field occupies 0 or 1 symbols.

[0118] In some embodiments, the first PPDU further includes a Physical Layer Convergence Protocol (PLCP) header field, which includes one or more of a signal field, a service field, and a length field.

[0119] In some embodiments, the rate indicated by the signal field is the lowest among the selectable rates; or, the rate indicated by the signal field is a rate that is not supported by the communication device capable of recognizing the signal field.

[0120] In some embodiments, the bits in the service field are all 0; or, the bits in the service field are all 1; or, the service field contains information related to the environmental power supply AMP device.

[0121] In some embodiments, the value of the length field in the PLCP header field matches the duration of the first PPDU; or, the value of the length field in the PLCP header field matches the duration of the downlink field of the first PPDU excluding the excitation field.

[0122] In some embodiments, the first PPDU is a PPDU for an AMP device.

[0123] Figure 12 is a schematic diagram of the structure of a communication device provided in another embodiment of this application. The communication device 1200 shown in Figure 12 may include a communication unit 1210. The communication unit 1210 is used to transmit a first PPDU.

[0124] In some embodiments, the first PPDU includes a conventional signal L-SIG field, which includes one or more of the following: a rate field, a length field, a reserved field, and a tail field.

[0125] In some embodiments, the rate field indicates the lowest rate among the selectable rates of the rate field; or, the rate field indicates a rate that is not supported by a communication device capable of recognizing the rate field.

[0126] In some embodiments, the value of the length field matches the duration of the first PPDU; or, the value of the length field matches the duration of the downlink field in the first PPDU, excluding the excitation field.

[0127] In some embodiments, the value of the reserved field is a default value; or, the value of the reserved field is not a default value.

[0128] In some embodiments, one or more bits of the tail field are not zero.

[0129] In some embodiments, the first PPDU includes an L-SIG field and a repeating conventional signal RL-SIG field, wherein the values ​​of the L-SIG field and the RL-SIG field are different.

[0130] In some embodiments, the value of the RL-SIG field is complementary to the value of the L-SIG field.

[0131] In some embodiments, the first PPDU includes a general signal U-SIG field, which includes one or more of the following: version field, bandwidth field, valid field, uplink / downlink field, transmission opportunity TXOP field, drop field, and ultra-high throughput EHT-SIG field.

[0132] In some embodiments, the values ​​of one or more valid fields in the U-SIG field are not default values.

[0133] In some embodiments, the U-SIG field includes three valid fields arranged in sequence, wherein the values ​​of the three valid fields are the following values ​​or complementary values ​​of the following values: 110, 100 or 000.

[0134] In some embodiments, the version field may take the value 3 to 7.

[0135] In some embodiments, the value of the bandwidth field is 6 or 7.

[0136] In some embodiments, if the first PPDU does not include an excitation field, the uplink / downlink field indicates downlink transmission; and / or, if the first PPDU includes an excitation field, the uplink / downlink field indicates uplink transmission.

[0137] In some embodiments, the value of the TXOP field is the maximum value in the range of TXOP values; or, the value of the TXOP field matches the duration of the first PPDU; or, the value of the TXOP field matches the remaining duration of the first PPDU.

[0138] In some embodiments, the value of the discard field is not a default value.

[0139] In some embodiments, the rate indicated by the EHT-SIG field is the lowest among the selectable rates; or, the rate indicated by the EHT-SIG field is a rate that is not supported by the communication device capable of recognizing the EHT-SIG field.

[0140] In some embodiments, the EHT-SIG field occupies 0 or 1 symbols.

[0141] In some embodiments, the first PPDU further includes a Physical Layer Convergence Protocol (PLCP) header field, which includes one or more of a signal field, a service field, and a length field.

[0142] In some embodiments, the rate indicated by the signal field is the lowest among the selectable rates; or, the rate indicated by the signal field is a rate that is not supported by the communication device capable of recognizing the signal field.

[0143] In some embodiments, the bits in the service field are all 0; or, the bits in the service field are all 1; or, the service field contains information related to the environmental power supply AMP device.

[0144] In some embodiments, the value of the length field in the PLCP header field matches the duration of the first PPDU; or, the value of the length field in the PLCP header field matches the duration of the downlink field of the first PPDU excluding the excitation field.

[0145] In some embodiments, the first PPDU is a PPDU for an AMP device.

[0146] Figure 13 is a schematic structural diagram of a communication apparatus according to an embodiment of this application. The dashed lines in Figure 13 indicate that the unit or module is optional. This apparatus 1300 can be used to implement the methods described in the above method embodiments. The apparatus 1300 can be a chip or a communication device.

[0147] Apparatus 1300 may include one or more processors 1310. The processor 1310 may support apparatus 1300 in implementing the methods described in the preceding method embodiments. The processor 1310 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0148] The apparatus 1300 may further include one or more memories 1320. The memories 1320 store a program that can be executed by the processor 1310, causing the processor 1310 to perform the methods described in the preceding method embodiments. The memories 1320 may be independent of the processor 1310 or integrated within the processor 1310.

[0149] The device 1300 may also include a transceiver 1330. The processor 1310 can communicate with other devices or chips via the transceiver 1330. For example, the processor 1310 can send and receive data with other devices or chips via the transceiver 1330.

[0150] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to the communication device provided in this application, and the program causes a computer to execute the methods performed by the communication device in various embodiments of this application.

[0151] This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided in this application embodiment, and the program causes a computer to execute the methods performed by the communication device in various embodiments of this application.

[0152] This application also provides a computer program. This computer program can be applied to the terminal or network device provided in this application, and causes the computer to execute the methods performed by the communication device in various embodiments of this application.

[0153] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0154] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0155] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0156] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0157] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0158] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0159] In the embodiments of this application, "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" mentioned in the embodiments of this application can be replaced with "indicating" or "used to determine". For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B".

[0160] In the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0161] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the WiFi protocol and related protocols applied to future WiFi communication systems, and this application does not limit it.

[0162] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0163] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0164] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0165] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0166] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method characterized by comprising: Comprising: A first device receives a first physical protocol data unit (PPDU).

2. The method of claim 1, wherein, The first PPDU comprises a legacy signal (L-SIG) field, the L-SIG field comprising one or more of: a rate field, a length field, a reserved field, a tail field.

3. The method of claim 2, wherein, The rate indicated by the rate field is the lowest rate among optional rates of the rate field; or the rate indicated by the rate field is a rate that is not supported by a communication device capable of recognizing the rate field.

4. The method according to claim 2 or 3, characterized in that, The length field has a value matching a duration of the first PPDU; or the length field has a value matching a duration of a downlink field in the first PPDU except for a stimulation field.

5. The method according to any one of claims 2 to 4, characterized in that, The reserved field has a value of a default value; or the reserved field has a value other than the default value.

6. The method according to any one of claims 2 to 5, characterized in that, One or more bits of the tail field have a value other than 0.

7. The method according to any one of claims 1 to 6, characterized in that, The first PPDU comprises an L-SIG field and a repeated legacy signal (RL-SIG) field, the L-SIG field and the RL-SIG field having different values.

8. The method of claim 7, wherein, The value of the RL-SIG field is complementary to the value of the L-SIG field.

9. The method according to any one of claims 1 to 8, characterized in that, The first PPDU comprises a universal signal (U-SIG) field, the U-SIG field comprising one or more of: a version field, a bandwidth field, a valid field, an uplink / downlink field, a transmission opportunity (TXOP) field, a discard field, an extremely high throughput (EHT-SIG) field.

10. The method of claim 9, wherein, One or more valid fields in the U-SIG field have a value other than a default value.

11. The method of claim 10, wherein, The U-SIG field comprises three valid fields arranged in a sequential order, the three valid fields having values of 110, 100, or 000 or complementary values thereof.

12. The method according to any one of claims 9 to 11, characterized in that, The value of the version field belongs to 3 to 7.

13. The method according to any one of claims 9 to 12, characterized in that, The value of the bandwidth field is 6 or 7.

14. The method of any of claims 9 to 13, wherein: if the first PPDU does not comprise a stimulation field, the uplink / downlink field indicates a downlink transmission; and / or, if the first PPDU comprises a stimulation field, the uplink / downlink field indicates an uplink transmission.

15. The method of any of claims 9 to 14, wherein: the TXOP field has a value of a maximum value in a value range of the TXOP; or, the TXOP field has a value matching a duration of the first PPDU; or, the TXOP field has a value matching a remaining duration of the first PPDU.

16. The method according to any one of claims 9 to 15, characterized in that, The value of the discard field is other than a default value.

17. The method according to any one of claims 9 to 16, characterized in that, The rate indicated by the EHT-SIG field is the lowest rate among optional rates; or the rate indicated by the EHT-SIG field is a rate that is not supported by a communication device capable of recognizing the EHT-SIG field.

18. The method according to any one of claims 9 to 17, characterized in that, The EHT-SIG field occupies a number of symbols of 0 or 1.

19. The method of any one of claims 1 to 18, wherein, The first PPDU further comprises a physical layer convergence protocol (PLCP) header field, the PLCP header field comprising one or more of: a signal field, a service field, a length field.

20. The method of claim 19, wherein, The rate indicated by the signal field is the lowest rate among optional rates; or the rate indicated by the signal field is a rate that is not supported by a communication device capable of recognizing the signal field.

21. The method of claim 19 or 20, wherein: the values of the bits in the service field are all 0; or the values of the bits in the service field are all 1; or the service field contains information related to an ambient-powered AMP device.

22. The method of any one of claims 19-21, wherein, The value of the length field in the PLCP header field matches the duration of the first PPDU; or the value of the length field in the PLCP header field matches the duration of the downlink field of the first PPDU excluding the stimulation field.

23. The method of any one of claims 1 to 22, wherein, The first PPDU is a PPDU for an AMP device.

24. A method of communication, comprising: Comprising: The second device transmits a first physical protocol data unit (PPDU).

25. The method of claim 24, wherein, The first PPDU comprises a legacy signal (L-SIG) field, and the L-SIG field comprises one or more of the following: a rate field, a length field, a reserved field, and a tail field.

26. The method of claim 25, wherein, The rate indicated by the rate field is the lowest rate among optional rates of the rate field; or the rate indicated by the rate field is a rate that is not supported by a communication device capable of recognizing the rate field.

27. The method of claim 25 or 26, wherein, The value of the length field matches the duration of the first PPDU; or the value of the length field matches the duration of the downlink field of the first PPDU excluding the stimulation field.

28. The method of any one of claims 25-27, wherein, A value of the reserved field is a default value; or a value of the reserved field is not a default value.

29. The method of any one of claims 25-28, wherein, A value of one or more bits of the tail field is not 0.

30. The method of any one of claims 24-29, wherein, The first PPDU comprises an L-SIG field and a repeated legacy signal (RL-SIG) field, and the values of the L-SIG field and the RL-SIG field are different.

31. The method of claim 30, wherein, The value of the RL-SIG field is complementary to the value of the L-SIG field.

32. The method of any one of claims 24-31, wherein, The first PPDU comprises a universal signal (U-SIG) field, and the U-SIG field comprises one or more of the following: a version field, a bandwidth field, a valid field, an uplink / downlink field, a transmission opportunity (TXOP) field, a discard field, and an extremely high throughput (EHT-SIG) field.

33. The method of claim 32, wherein, A value of one or more valid fields in the U-SIG field is not a default value.

34. The method of claim 33, wherein, The U-SIG field comprises three valid fields arranged in a sequential order, and the values of the three valid fields are 110, 100, or 000 or their complementary values.

35. The method of any one of claims 32-34, wherein, The value of the version field belongs to 3 to 7.

36. The method of any one of claims 32-35, wherein, The value of the bandwidth field is 6 or 7.

37. The method of any one of claims 32 to 36, wherein: if the first PPDU does not comprise a stimulation field, the uplink / downlink field indicates a downlink transmission; and / or if the first PPDU comprises a stimulation field, the uplink / downlink field indicates an uplink transmission.

38. The method of any one of claims 32 to 37, wherein: The TXOP field takes a value of a maximum value in a value range of the TXOP; or The TXOP field takes a value matching a duration of the first PPDU; or The TXOP field takes a value matching a remaining duration of the first PPDU.

39. The method of any one of claims 32-38, wherein, The discard field takes a value other than a default value.

40. The method of any one of claims 32-39, wherein, The EHT-SIG field indicates a rate of a lowest rate in optional rates; or the EHT-SIG field indicates a rate not supported by a communication device capable of recognizing the EHT-SIG field.

41. The method of any one of claims 32-40, wherein, The EHT-SIG field occupies 0 or 1 symbols.

42. The method of any one of claims 24-41, wherein, The first PPDU further includes a physical layer convergence protocol (PLCP) header field, and the PLCP header field includes one or more of a signal field, a service field, and a length field.

43. The method of claim 42, wherein, The signal field indicates a rate of a lowest rate in optional rates; or the signal field indicates a rate not supported by a communication device capable of recognizing the signal field.

44. The method of claim 42 or 43, wherein: The bits in the service field all take a value of 0; or The bits in the service field all take a value of 1; or The service field contains information related to an ambient-powered (AMP) device.

45. The method of any one of claims 42-44, wherein, The length field in the PLCP header field takes a value matching a duration of the first PPDU; or the length field in the PLCP header field takes a value matching a duration of a downlink field of the first PPDU other than a stimulation field.

46. The method of any one of claims 24-45, wherein, The first PPDU is a PPDU for an AMP device.

47. A communications device, characterized by The communication device is a first device, and the communication device includes: A communication unit configured to receive a first physical protocol data unit (PPDU).

48. The communication device of claim 47, wherein, The first PPDU includes a legacy signal (L-SIG) field, and the L-SIG field includes one or more of a rate field, a length field, a reserved field, and a tail field.

49. The communication device of claim 48, wherein, The rate field indicates a rate of a lowest rate in optional rates of the rate field; or the rate field indicates a rate not supported by a communication device capable of recognizing the rate field.

50. The communication device of claim 48 or 49, wherein, The length field takes a value matching a duration of the first PPDU; or the length field takes a value matching a duration of a downlink field of the first PPDU other than a stimulation field.

51. The communication device of any one of claims 48-50, wherein, The reserved field takes a value other than a default value.

52. The communication device of any one of claims 48-51, wherein, One or more bits of the tail field take a value other than 0.

53. The communication device of any one of claims 47-52, wherein, The first PPDU includes the L-SIG field and a repeated legacy signal (RL-SIG) field, and the L-SIG field and the RL-SIG field take different values.

54. The communication device of claim 53, wherein, The RL-SIG field takes a value complementary to a value of the L-SIG field.

55. The communication device according to any one of claims 47-54, wherein, The first PPDU comprises a universal signal (U-SIG) field, and the U-SIG field comprises one or more of the following: a version field, a bandwidth field, a valid field, an uplink / downlink field, a transmission opportunity (TXOP) field, a discard field, an extremely high throughput (EHT-SIG) field.

56. The communication device of claim 55, wherein, The value of the one or more valid fields in the U-SIG field is not a default value.

57. The communication device of claim 56, wherein, The U-SIG field comprises three valid fields arranged in a sequential order, and the values of the three valid fields are 110, 100 or 000 or the complements of 110, 100 or 000.

58. The communication device of any one of claims 55 to 57, wherein, The value of the version field belongs to 3 to 7.

59. The communication device of any one of claims 55 to 58, wherein, The value of the bandwidth field is 6 or 7.

60. The communication device of any one of claims 55 to 59, wherein: if the first PPDU does not comprise a stimulation field, the uplink / downlink field indicates a downlink transmission; and / or, if the first PPDU comprises a stimulation field, the uplink / downlink field indicates an uplink transmission.

61. The communication device of any one of claims 55 to 60, wherein: the value of the TXOP field is a maximum value in a value range of the TXOP; or, the value of the TXOP field matches a duration of the first PPDU; or, the value of the TXOP field matches a remaining duration of the first PPDU.

62. The communication device of any one of claims 55 to 61, wherein, The value of the discard field is not a default value.

63. The communication device of any one of claims 55 to 62, wherein, The rate indicated by the EHT-SIG field is a lowest rate in optional rates; or the rate indicated by the EHT-SIG field is a rate that is not supported by a communication device capable of recognizing the EHT-SIG field.

64. The communication device of any one of claims 55 to 63, wherein, The EHT-SIG field occupies 0 or 1 symbols.

65. The communication device according to any one of claims 47-64, wherein, The first PPDU further comprises a physical layer convergence protocol (PLCP) header field, and the PLCP header field comprises one or more of the following: a signal field, a service field, a length field.

66. The communication device of claim 65, wherein, The rate indicated by the signal field is a lowest rate in optional rates; or the rate indicated by the signal field is a rate that is not supported by a communication device capable of recognizing the signal field.

67. The communication device of claim 65 or 66, wherein: the values of bits in the service field are all 0; or, the values of bits in the service field are all 1; or, the service field contains information related to an ambient power-enabled (AMP) device.

68. The communication device of any one of claims 65 to 67, wherein, The value of the length field in the PLCP header field matches a duration of the first PPDU; or the value of the length field in the PLCP header field matches a duration of a downlink field of the first PPDU except a stimulation field.

69. The communication device of any one of claims 47-68, wherein, The first PPDU is a PPDU for an AMP device.

70. A communications device, characterized by The communication device comprises a second device, and the communication device comprises: a communication unit configured to send a first physical protocol data unit (PPDU).

71. The communication device of claim 70, wherein, The first PPDU comprises a legacy signal (L-SIG) field, and the L-SIG field comprises one or more of the following: a rate field, a length field, a reserved field, a tail field.

72. The communication device of claim 71, wherein, The rate indicated by the rate field is the lowest rate in the optional rates of the rate field; or the rate indicated by the rate field is a rate that is not supported by a communication device capable of identifying the rate field.

73. The communication device of claim 71 or 72, wherein, The value of the length field matches the duration of the first PPDU; or the value of the length field matches the duration of a downlink field in the first PPDU except the stimulus field.

74. The communication device of any one of claims 72 to 73, wherein, The value of the reserved field is a default value; or the value of the reserved field is not a default value.

75. The communication device of any one of claims 71 to 74, wherein, The value of one or more bits of the tail field is not 0.

76. The communication device of any one of claims 70 to 75, wherein, The first PPDU comprises an L-SIG field and a repeated legacy signal RL-SIG field, and the values of the L-SIG field and the RL-SIG field are different.

77. The communication device of claim 76, wherein, The value of the RL-SIG field is complementary to the value of the L-SIG field.

78. The communication device of any one of claims 70 to 76, wherein, The first PPDU comprises a universal signal U-SIG field, and the U-SIG field comprises one or more of the following: a version field, a bandwidth field, a valid field, an uplink / downlink field, a transmission opportunity TXOP field, a discard field, and an extremely high throughput EHT-SIG field.

79. The communication device of claim 78, wherein, The value of one or more valid fields in the U-SIG field is not a default value.

80. The communication device of claim 79, wherein, The U-SIG field comprises three valid fields arranged in a sequential order, and the values of the three valid fields are 110, 100, or 000 or the complements of the values.

81. The communication device of any one of claims 78 to 80, wherein, The value of the version field belongs to 3 to 7.

82. The communication device of any one of claims 78 to 81, wherein, The value of the bandwidth field is 6 or 7.

83. The communication device of any one of claims 78 to 82, wherein: if the first PPDU does not comprise a stimulus field, the uplink / downlink field indicates a downlink transmission; and / or if the first PPDU comprises a stimulus field, the uplink / downlink field indicates an uplink transmission.

84. The communication device of any one of claims 78 to 83, wherein: the value of the TXOP field is the maximum value in the value range of the TXOP; or the value of the TXOP field matches the duration of the first PPDU; or the value of the TXOP field matches the remaining duration of the first PPDU.

85. The communication device of any one of claims 78 to 84, wherein, The value of the discard field is not a default value.

86. The communication device of any one of claims 78 to 85, wherein, The rate indicated by the EHT-SIG field is the lowest rate in the optional rates; or the rate indicated by the EHT-SIG field is a rate that is not supported by a communication device capable of identifying the EHT-SIG field.

87. The communication device of any one of claims 78 to 86, wherein, The EHT-SIG field occupies 0 or 1 symbols.

88. The communication device of any one of claims 70 to 87, wherein, The first PPDU further comprises a physical layer convergence protocol PLCP header field, and the PLCP header field comprises one or more of a signal field, a service field, and a length field.

89. The communication device of claim 88, wherein, The rate indicated by the signal field is the lowest rate in the optional rates; or the rate indicated by the signal field is a rate that is not supported by a communication device capable of identifying the signal field.

90. The communication device of claim 88 or 89, wherein: The values of the bits in the service field are all 0; or The values of the bits in the service field are all 1; or The service field contains information related to the environmental energy supply AMP device.

91. The communication device of any one of claims 78 to 90, wherein, The value of the length field in the PLCP header field matches the duration of the first PPDU; or the value of the length field in the PLCP header field matches the duration of the downlink field of the first PPDU excluding the activation field.

92. The communication device of any one of claims 70 to 91, wherein, The first PPDU is a PPDU for the AMP device.

93. A communications device, characterized by A computer program product including a memory for storing a program and a processor for invoking the program in the memory to cause the communication device to perform the method of any of claims 1-23 or 24-46.

94. An apparatus comprising: A computer program product including a processor for invoking a program from a memory to cause the apparatus to perform the method of any of claims 1-23 or 24-46.

95. A chip, comprising: A computer program product including a processor for invoking a program from a memory to cause the apparatus to perform the method of any of claims 1-23 or 24-46.

96. A computer-readable storage medium, characterized in that, A computer program product including a processor for invoking a program from a memory to cause the apparatus to perform the method of any of claims 1-23 or 24-46.

97. A computer program product, characterized in that, A computer program product including a processor for invoking a program from a memory to cause the apparatus to perform the method of any of claims 1-23 or 24-46.

98. A computer program, characterized in that, A computer program product including a processor for invoking a program from a memory to cause the apparatus to perform the method of any of claims 1-23 or 24-46.

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