Wireless communication method and communication device

Abstract

Provided are a wireless communication method and a communication device. The method comprises: a first device adjusting a transmission power, wherein the transmission power is associated with the distance between the first device and a second device. In this way, a first device adjusts its transmission power, which is associated with the distance between the first device and a second device, thereby alleviating the problem of hidden nodes caused by the first device, and reducing the interference of a transmitted signal from the first device on the communication between other conventional devices and the second device.

Description

Wireless communication methods and communication devices Technical Field

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

[0002] Because ambient-powered (AMP) devices have limited energy harvesting efficiency and energy storage capacity, they cannot carry a preamble like legacy wireless fidelity (WiFi) devices when transmitting signals. Without a legacy preamble, AMP devices are more prone to hidden node issues because traditional WiFi devices cannot detect signals emitted by AMP devices that do not carry a preamble.

[0003] Summary of the Invention

[0004] This application provides a method and apparatus for wireless communication. The various aspects covered by this application are described below.

[0005] In a first aspect, a method for wireless communication is provided, comprising: a first device adjusting a transmission power, wherein the transmission power is related to the distance between the first device and a second device.

[0006] In a second aspect, a method for wireless communication is provided, comprising: a second device transmitting a power control signal, wherein the transmission power of a first device is adjusted based on the power control signal or a signal associated with the power control signal, the transmission power being associated with the distance between the first device and the second device.

[0007] Thirdly, a wireless communication method is provided, comprising: an auxiliary node between a first device and a second device receiving a power control signal transmitted by the second device, wherein the first device transmits a signal to the second device based on backscattering, a carrier for backscattering is transmitted by the auxiliary node, the transmission power of the carrier is adjusted based on the power control signal or a signal associated with the power control signal, and the transmission power is associated with the distance between the first device and the second device.

[0008] Fourthly, a communication device is provided, the communication device being a first device, comprising: a processing unit for adjusting a transmission power, wherein the transmission power is related to the distance between the first device and a second device.

[0009] In a fifth aspect, a communication device is provided, the communication device being a second device, comprising: a transceiver configured to transmit a power control signal, wherein a transmission power of a first device is adjusted based on the power control signal or a signal associated with the power control signal, the transmission power being associated with a distance between the first device and the second device.

[0010] In a sixth aspect, a communication device is provided, the communication device being an assisting node between a first device and a second device, comprising: a transceiver configured to receive a power control signal transmitted by the second device, wherein the first device transmits a signal to the second device in a backscattering manner, a carrier for the backscattering being transmitted by the assisting node, a transmission power of the carrier being adjusted based on the power control signal or a signal associated with the power control signal, the transmission power being associated with a distance between the first device and the second device.

[0011] In a seventh aspect, a communication device is provided, comprising a transceiver, a memory and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit a signal, so that the communication device performs the method of the first aspect.

[0012] In an eighth aspect, a communication device is provided, comprising a transceiver, a memory and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit a signal, so that the network device performs the method of the second aspect.

[0013] In a ninth aspect, a communication device is provided, comprising a transceiver, a memory and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit a signal, so that the network device performs the method of the third aspect.

[0014] In a tenth aspect, an apparatus is provided, comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method of the first aspect, the second aspect or the third aspect.

[0015] In an eleventh aspect, a chip is provided, comprising a processor configured to invoke a program from a memory, so that a device installed with the chip performs the method of the first aspect, the second aspect or the third aspect.

[0016] In a twelfth aspect, a computer readable storage medium is provided, having a program stored thereon, the program causing a computer to perform the method of the first aspect, the second aspect or the third aspect.

[0017] In a thirteenth aspect, a computer program product is provided, comprising a program which causes a computer to perform the method of the first aspect, the second aspect, or the third aspect.

[0018] In a fourteenth aspect, a computer program is provided, which causes a computer to perform the method of the first aspect, the second aspect, or the third aspect.

[0019] In the embodiments of the present application, the first device adjusts its transmission power, which is associated with the distance between the first device and the second device, so as to alleviate the hidden node problem caused by the first device and reduce the interference of the transmission signal of the first device to the communication between other legacy devices and the second device. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is an example of a system architecture of a wireless communication system suitable for the embodiments of the present application.

[0021] FIG. 2 is an example of a structure of an AMP device suitable for the embodiments of the present application.

[0022] FIG. 3 is an example of a structure of an energy harvesting module in FIG. 2.

[0023] FIG. 4 is a schematic diagram of a backscatter communication process of an AMP device.

[0024] FIG. 5 is a schematic diagram of the impact of a preamble on a legacy WiFi device.

[0025] FIG. 6 is a schematic diagram of the impact of a preamble on a legacy AMP device.

[0026] FIG. 7 is a flowchart of a wireless communication method according to an embodiment of the present application.

[0027] FIG. 8 is a schematic diagram of an interference area of an AMP device.

[0028] FIG. 9 is a schematic diagram of a structure of a communication device according to an embodiment of the present application.

[0029] FIG. 10 is a schematic diagram of a structure of a communication device according to another embodiment of the present application.

[0030] FIG. 11 is a schematic diagram of a structure of a communication device according to another embodiment of the present application.

[0031] FIG. 12 is a schematic diagram of an apparatus for communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0033] Communication system

[0034] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as a wireless local area network (WLAN), a wireless fidelity (Wi-Fi), a high performance radio local area network (HIPELAN), a wide area network (WAN), a cellular network, or other communication systems. For example, the technical solutions provided by the embodiments of the present application can be applied to a communication system using an 802.11 standard. For example, the 802.11 standard includes but is not limited to an 802.11ax standard, an 802.11be standard, and a next-generation 802.11 standard.

[0035] FIG. 1 shows a schematic diagram of a communication system to which the embodiments of the present application are applicable. As shown in FIG. 1, the communication devices in the communication system 100 can include an access point (AP) 111, an AP 112, and a station (STA) 121 and a STA 122. The STA 121 can access a network through the AP 111, and the STA 122 can access a network through the AP 112.

[0036] In some implementations, a STA can establish an association relationship with one or more APs. Then, the STA and the APs having the association relationship can communicate with each other. As shown in FIG. 1, the AP 111 and the STA 121 can communicate with each other after establishing an association relationship, and the AP 112 and the STA 122 can communicate with each other after establishing an association relationship.

[0037] In some implementations, the communication in the communication system 100 can be communication between an AP and a non-AP STA, communication between non-AP STAs, or communication between a STA and a peer STA. The peer STA can refer to a device that communicates with the STA, for example, the peer STA can be an AP or a non-AP STA.

[0038] It should be understood that FIG. 1 exemplarily shows two AP STAs and two non-AP STAs, and the communication system 100 can include a larger number of AP STAs, or the communication system 100 can include a larger number of non-AP STAs, which are not limited by the embodiments of the present application.

[0039] In addition, the communication system can be applied to a multi-device cooperation scenario, such as a multi-AP (multiple access points, multi-AP) cooperation scenario or a multi-site cooperation scenario.

[0040] In the embodiments of the present application, the names of the AP and / or the STA are not limited. In some scenarios, the AP can also be referred to as an AP STA, that is, in a certain sense, the AP can also be regarded as a kind of STA. In other scenarios, the STA can also be referred to as a non-AP STA (non-AP STA).

[0041] In some scenarios, the communication device described above can also be a multi-link device (MLD), that is, a device that can communicate through multiple communication links, where the multiple communication links can include communication links of different frequency bands, for example, can include millimeter wave frequency bands and / or low frequency frequency bands. Generally, if the multi-link device is an AP, the AP can also be referred to as a "multi-link AP". If the multi-link device is a STA, the STA can also be referred to as a "multi-link STA".

[0042] In the embodiments of the present application, the AP can be a device in a wireless network. The AP can be a communication server, a router, a switch, a network bridge, or the like, or the AP can include various forms of macro base stations, micro base stations, relay stations, etc., of course, the AP can also be a chip, a circuit or a processing system in various forms of devices, so as to realize the methods and functions described in the embodiments of the present application. The AP can be applied to various scenarios, such as sensor nodes in smart cities (for example, smart water meters, smart electricity meters, smart air detection nodes), smart devices in smart homes (for example, smart cameras, projectors, display screens, televisions, sound systems, refrigerators, washing machines, etc.), nodes in the Internet of Things, entertainment terminals (for example, AR, VR, etc. wearable devices), smart devices in smart offices (for example, printers, projectors, etc.), Internet of Vehicles devices in the Internet of Vehicles, some infrastructure in daily life scenarios (for example, vending machines, self-service navigation stations in supermarkets, self-service checkout devices, self-service ordering machines), etc.

[0043] In some implementations, the role of the STA in the communication system is not absolute. In some scenarios, the STA can act as an AP. For example, in the scenario of a mobile phone connecting a router, the mobile phone can be a non-AP STA, and in the case of the mobile phone acting as a hotspot for other mobile phones, the mobile phone acts as an AP.

[0044] In the embodiments of the present application, the STA can be a device with wireless transceiving function, for example, a device supporting 802.11 series protocols, or a device capable of communicating with an AP or other STAs. For example, the STA is any user communication device allowing a user to communicate with an AP and thus communicate with a WLAN. The STA is, for example, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile terminal, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, etc.

[0045] The STA in the embodiments of the present application can also be a device providing voice / data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. The device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc., and the embodiments of the present application are not limited thereto.

[0046] The STA can also be a wearable device. The wearable device can also be referred to as a smart wearable device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device includes, but is not limited to, a smart watch or smart glasses, and devices that focus on a certain type of application function and need to be used in cooperation with other devices, such as a smart phone, for example, various types of smart wristbands, smart jewelry, and the like.

[0047] The STA can also be a terminal device in an Internet of Things (IoT) system. The IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and a network, thereby realizing an intelligent network of human-machine interconnection or object-object interconnection. In the embodiments of the present application, the IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.

[0048] The STA can also be a device in a vehicle-to-everything (V2X) system. The communication mode in the V2X system is collectively referred to as V2X (X represents anything). For example, the V2X communication includes vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, or vehicle-to-network (V2N) communication.

[0049] In addition, the STA can also include a smart printer, a train detector, a gas station sensor, and the like, and the main functions include collecting data (for some terminal devices), receiving control information and downlink data of the AP, and transmitting electromagnetic waves to transmit data to the AP.

[0050] In addition, the AP in the embodiments of the present application can be a device for communicating with the STA. For example, the AP can be a network device in a wireless local area network, and the AP can be used to communicate with the STA through the wireless local area network.

[0051] From the perspective of the communication mode supported by the AP, in some implementations, the AP can be a device supporting the 802.11be mode. The AP can also be a device supporting multiple current and future WLAN modes of the 802.11 family, such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

[0052] From the perspective of the communication standards supported by the STAs, in some implementations, the non-AP STAs can support the 802.11be standard. The non-AP STAs can also support multiple current and future WLAN standards of the 802.11 family, such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

[0053] In the embodiments of the present application, the frequency bands that can be supported by the WLAN technology are not limited. For example, the frequency bands that can be supported by the WLAN technology include, but are not limited to, low-frequency frequency bands (for example, 2.4 GHz, 5 GHz, and 6 GHz) and high-frequency frequency bands (for example, 45 GHz and 60 GHz).

[0054] It should be understood that the specific forms of the STAs and the APs in the embodiments of the present application are not specially limited, and are only exemplary described herein.

[0055] AMP device

[0056] With the development of wireless communication technology, people hope to integrate wireless communication systems with various vertical industries such as logistics, manufacturing, transportation, and energy. For example, a wireless communication system can be integrated with an industrial wireless sensor network (IWSN); for another example, a wireless communication system can be integrated with smart logistics and smart warehousing; for another example, a wireless communication system can be integrated with a smart home network.

[0057] However, in these industries, communication devices usually need to have the characteristics of low cost, small size (for example, ultra-thin), maintenance-free, long life, and the like. Therefore, in order to meet the above conditions, zero-power communication technology can be used for communication. In this scenario, the STAs 121 and 122 mentioned in the foregoing can be “zero-power devices” or “AMP devices”.

[0058] As shown in FIG. 2, the AMP device 210 supporting the zero-power communication technology can include an energy harvesting module 211 and a backscatter communication module 212. In some implementations, the AMP device 210 can further include a low-power computing module 213. The low-power computing module 213 is configured to provide the AMP device 210 with computing functions such as data processing and the like. In other implementations, the AMP device 210 can further include a sensor 214 configured to collect external information (for example, ambient temperature, ambient humidity, and the like). In other implementations, the AMP device 210 can further include a memory 215 configured to store some information (for example, external information collected by the sensor, an article identifier, and the like).

[0059] The energy collection module 211 is configured to collect energy. In some embodiments, the energy collection module 211 can collect energy from a power supply signal transmitted by another device or from the external environment. The power supply signal can be a radio frequency signal transmitted by a network device. Thus, the energy collection module 211 can be a radio frequency energy collection module. The energy collection module 211 can be configured to collect any type of signal in the environment. For example, the energy collection module 211 can be configured to collect a power supply signal transmitted by another device or energy in the environment. The form of the power supply signal is not limited in the embodiments of the present application. For example, the power supply signal can be a modulated wireless signal or an unmodulated wireless signal (e.g., a carrier signal). For another example, the power supply signal can be a wireless signal of any waveform (e.g., a sine wave, a square wave), etc.

[0060] In other embodiments, the AMP device 210 can further include a logic processing unit configured to perform corresponding computing functions.

[0061] FIG. 3 illustrates a possible structure of the energy collection module 211. As shown in FIG. 3, the energy collection module 211 can collect energy of a spatial electromagnetic wave of a radio frequency signal based on the principle of electromagnetic induction, and store the collected energy in a capacitor C, i.e., a charging process of the capacitor C. When the charging process of the capacitor C is completed, the capacitor C can start discharging to supply energy to the AMP device 210. For example, the discharging of the capacitor C can be used to drive the AMP device 210 to perform low-power demodulation on data transmitted by another device. For another example, the discharging of the capacitor C can be used to drive the AMP device 210 to modulate data to be transmitted. For another example, the discharging of the capacitor C can be used to drive a sensor of the AMP device 210 to collect data. For another example, the discharging of the capacitor C can be used to drive the AMP device 210 to read data in the memory 215, etc.

[0062] As shown in FIG. 4, the AMP device 210 receives a wireless signal transmitted by another device, and modulates the wireless signal to load data to be transmitted. Then, the AMP device 210 radiates the modulated signal from an antenna, and this information transmission process is referred to as backscatter communication. The wireless signal can also be referred to as a carrier signal. The carrier signal can refer to an unmodulated wireless signal. The carrier signal can be, for example, a sine wave signal. The backscatter communication and the load modulation function are closely related. The load modulation function can be understood as adjusting and controlling the circuit parameters of the oscillation loop of the AMP device 210 according to the beat of the data stream, so that the size of the impedance and other parameters of the AMP device 210 change, thereby completing the modulation process.

[0063] Hidden node problem

[0064] For two devices, e.g., a first device and a second device, when the first device cannot be detected by other devices, the signal transmitted by the first device to the second device can interfere with the signal transmission between the other devices and the second device. At this time, the problem of hidden node of the first node occurs, that is, the first node is a hidden node relative to the other devices.

[0065] Hereinafter, the problem of hidden node in the WiFi system is described with the first device as an AMP device and the second device as an AP as an example in combination with FIG. 5 and FIG. 6.

[0066] Channel access in the WiFi system is based on listen before talk (LBT) and multiple access architecture. However, when multiple WiFi devices simultaneously attempt to access the channel, the problem of hidden node can occur, resulting in collision in the area near the AP, thereby causing the decline of communication performance. In the protocol 802.11ba, for example, wake-up radio (WUR), when working at 2.4 GHz, due to the limited processing capability of the WUR device, the bandwidth occupied by the WUR frame transmitted after the preamble transmission with a bandwidth of 20 MHz is only 4 MHz. By appending a traditional preamble before the WUR frame, the traditional WiFi device can detect such signals, thereby alleviating the problem of hidden node caused by the WUR device. However, in the scenario of deploying AMP devices, the problem of hidden node caused by the AMP device becomes more serious, because when the AMP device transmits signals, due to the limited energy harvesting efficiency and energy storage capacity of the AMP device, the physical layer protocol data unit (PPDU) of the AMP device cannot carry the preamble that needs to occupy a large bandwidth, resulting in that the traditional WiFi device cannot detect the AMP device, and thus the transmission signal of the AMP device near the AP can interfere with the signal transmission of the traditional WiFi device.

[0067] Carrier sensing is a channel access procedure for WiFi devices, in which a WiFi device backs off when it detects another signal on the air. The preamble helps the receiver in a WiFi device to detect whether there is a WiFi signal on the channel, so that it can distinguish noise from actual data. Generally, there are two different detection methods, energy detection (ED) and carrier sensing. ED is used to detect signal energy, and carrier sensing is used to detect WiFi signals. The corresponding detection threshold for ED is usually -62dBm, and the corresponding detection threshold for carrier sensing is usually -82dBm. If there is no preamble, signals below -62dBm cannot be detected; if there is a preamble, signals below -82dBm cannot be detected.

[0068] Figure 5 shows the impact of the preamble on a legacy WiFi device. Figure 5 shows an example with a carrier frequency of 2.4GHz. The upper part of Figure 5 shows the case with a preamble, and the lower part shows the case without a preamble. Assume that the transmit (Tx) power of a legacy WiFi device is 20dBm, and the detection threshold is -82dBm. In the case of carrying a preamble, the detectable range is the area where the path loss is less than 102dB, i.e. the area to the right of the curve. If no preamble is carried, the detection threshold is -62dBm, and the detection range is the area where the path loss is less than 82dB. Since the detection threshold is higher when no preamble is carried, the curve moves to the right, i.e. the undetectable area is enlarged, as shown by the shaded area, which makes the hidden node problem worse.

[0069] Figure 6 shows the impact of the preamble on an AMP device. Figure 6 shows an example with a carrier frequency of 2.4GHz. The upper part of Figure 6 shows the case with a preamble, and the lower part shows the case without a preamble. For an AMP device, assume that the transmit power is -10dBm. According to the same logic as above, if no preamble is carried, the undetectable area of the AMP device is further enlarged. In this regard, the detectable area of the AMP device is reduced from 102dB to 52dB. Considering the free space path loss, the size of the detectable area can be reduced to less than 1 / 100 of that of a legacy WiFi device. The hidden node problem of the AMP device is much more serious than that of a legacy WiFi device, which means that most AMP devices cannot be detected by other WiFi devices.

[0070] To this end, an embodiment of the present application proposes that the first device adjusts its transmit power, which is associated with the distance between the first device and the second device, so as to alleviate the hidden node problem caused by the first device and reduce the interference of the transmit signal of the first device on the communication between other legacy devices and the second device.

[0071] The embodiments of the present application will be described in detail below with reference to FIG. 7.

[0072] FIG. 7 is a flow diagram of a wireless communication method provided by an embodiment of the present application. The method 700 shown in FIG. 7 can be performed by a first device and / or a second device. The first device is a station, for example, the STA 121 or the STA 122 shown in FIG. 1; and the second device is an access point, for example, the AP 111 or the AP 112 shown in FIG. 1. In some implementations, the first device is an AMP device, for example, the AMP device 210 shown in FIG. 2.

[0073] Referring to FIG. 7, in step 710, the first device adjusts its transmission power.

[0074] The transmission power can be used, for example, for the first device to transmit a signal to the second device.

[0075] Optionally, the transmission power of the first device is associated with the position of the first device relative to the second device, or in other words, the distance between the first device and the second device. For example, if the position of the first device is close to the second device, or in other words, the distance between the first device and the second device is reduced, the transmission power of the first device is reduced; and if the position of the first device is far away from the second device, or in other words, the distance between the first device and the second device is increased, the transmission power of the first device is increased. The association between the transmission power of the first device and the position of the first device will be described in more detail below with reference to FIG. 8.

[0076] As shown in FIG. 8, still taking the WiFi system as an example, assuming that the first device is an AMP device and the second device is an AP, the shaded area shown in FIG. 8 is a dark circle, wherein the AMP devices located in the dark circle can interfere with the legacy WiFi devices, and the AMP devices located outside the dark circle will not interfere with the legacy WiFi devices or the interference can be ignored. Assuming that the transmission power of the legacy WiFi device is 20 dBm, the distance between the legacy WiFi device and the AP is 10 m, and the received (Rx) power is -40 dBm considering the free space path loss at 2.4 GHz frequency. In order to achieve a modulation and coding scheme (MSC) level of 64 quadrature amplitude modulation (QAM) and coding rate 1 / 2, the signal-to-noise ratio required by the AP is 20 dB. Assuming that the transmission power of the AMP device is -10 dBm, any AMP device with a received power higher than -60 dBm can interfere with the legacy WiFi device. Therefore, as shown in the left part of FIG. 8, the AMP devices located in the dark circle with a radius (R) of 3 m can interfere with the legacy WiFi device. Once the power of the AMP device is reduced from -10 dBm to -20 dBm, as shown in the right part of FIG. 8, the radius of the dark circle is reduced from 3 m to 1 m, which means that the interference area is reduced, which greatly reduces the number of AMP devices that can interfere with the legacy WiFi device.

[0077] As can be seen, if the first device or the second device can know the location of the first device, or in other words, the distance between the first device and the second device, the interference caused by the transmission signal of the first device to the communication between other legacy devices and the second device can be reduced by adjusting the transmission power of the first device.

[0078] The transmission power of the first device can be adjusted in various ways, for example, the transmission power can be adjusted to be equal to a target power value in a plurality of predetermined power values; for another example, the transmission power can be gradually increased or decreased based on a predetermined power interval.

[0079] For example, the predetermined multiple power values hypothesis includes N power levels (or power values), N is greater than 1, the N power levels correspond to N distance ranges, the first device determines the corresponding power level based on the range in which the distance between the first device and the second device is located, and adjusts the transmission power of the first device to be equal to the power level, wherein the distance range can be replaced by the information associated with the location of the first device, such as the area range. Assuming N = 2, a high power level and a low power level can be configured. In 1-bit representation, the high power level can be 1 and the low power level can be 0; or the high power level is 0 and the low power level is 1. This method can be referred to as a discrete power level adjustment method.

[0080] For another example, a progressive power level adjustment method can be used, assuming that the power interval is ΔP, the transmission power of the first device can be compensated based on ±ΔP and adjusted step by step. In 1-bit representation, 1 means increasing the transmission power of the first device by ΔP, and 0 means decreasing the transmission power of the first device by ΔP; or 0 means increasing the transmission power of the first device by ΔP, and 1 means decreasing the transmission power of the first device by ΔP.

[0081] In this way, the transmission power of the first device is controlled based on the distance between the first device and the second device. For the first device closer to the second device, the transmission power of the first device can be reduced because the distance between the first device and the second device is short, thereby reducing the interference of the first device to other devices that cannot detect the first device. For the first device farther away from the second device, the transmission power of the first device can be increased because the distance between the first device and the second device is farther. At this time, although the transmission power of the first device is high, the interference of the first device to other devices that cannot detect the first device can be negligible, as described above, for example, as shown in FIG. 8, because the first device can be located in the area outside the dark circle.

[0082] It can be understood that the distance between the first device and the second device is associated with the received signal strength of the signal of the first device at the second device, wherein the greater the received signal strength is, the closer the distance between the first device and the second device is, and the smaller the received signal strength is, the farther the distance between the first device and the second device is. Therefore, the transmission power of the first device can be controlled based on the received signal strength of the signal of the first device at the second device. For example, the received signal strength of the signal of the first device at the second device is greater, and the transmission power of the first device can be reduced, so as to reduce the interference of the first device to other devices which cannot detect the first device; the received signal strength of the signal of the first device at the second device is lower, and the transmission power of the first device can be increased, and at this time, although the transmission power of the first device is high, the interference of the first device to other devices which cannot detect the first device can be negligible, as described above, for example, as shown in FIG. 8, because the first device can be located in the area outside the dark circle.

[0083] In the embodiments of the present application, the adjustment of the transmission power of the first device can be initiated by the first device or initiated by the second device, or the power control of the first device by the second device can be indirectly implemented through the secondary node between the first device and the second device. The following is described in combination with Embodiments 1 to 3 respectively.

[0084] Embodiment 1

[0085] In Embodiment 1, the adjustment of the transmission power of the first device can be initiated by the first device.

[0086] In some scenarios, for example, in an inventory scenario, the first device only reports its own identification (ID) to the second device, and such reporting is performed only once and is not associated with the second device. In this case, the second device cannot control the transmission power of the first device, and therefore the transmission power of the first device can be adjusted by itself.

[0087] In some embodiments, the first device transmits the first signal to the second device based on an initial power. The transmit power of the first device can be adjusted based on whether the first device receives feedback information (e.g., an ACK frame) sent by the second device for the first signal. For example, the transmit power of the first device is increased if the first device does not receive the feedback information, and the transmit power of the first device is maintained or decreased if the first device receives the feedback information. After the first device transmits the first signal to the second device, if the first device does not receive the feedback signal sent by the second device, the transmit power of the first device needs to be increased to ensure the signal transmission performance between the first device and the second device, and if the first device receives the feedback signal sent by the second device, the transmit power of the first device can be maintained or attempted to be decreased to reduce the interference of the first device to other devices. The initial power of the first device can be set to a low value, and the transmit power of the first device is gradually increased after the first device does not receive the feedback information sent by the second device.

[0088] The initial power used by the first device to transmit the first signal to the second device can be preset or determined by measuring a signal sent by the second device. For example, the second device can send a second signal to the first device, and the first device receives the second signal sent by the second device and measures the second signal to determine the initial power used to transmit the first signal based on the measurement result of the second signal. The first device adjusts the transmit power at a later Tx occasion after transmitting the first signal based on the initial power.

[0089] For example, if the measurement result of the second signal is good, indicating that the distance between the first device and the second device can be short, the first device can cause large interference to other devices, and thus the transmit power of the first device can be decreased. For another example, if the measurement result of the second signal is poor, indicating that the distance between the first device and the second device can be long, the first device can cause small interference to other devices, and thus the transmit power of the first device can be maintained or appropriately increased to ensure the signal transmission performance between the first device and the second device. The second signal sent by the second device can be a beacon frame.

[0090] In some embodiments, the first device can send a third signal to the second device. The third signal carries the transmit power determined by the first device for transmitting a specific frame. The specific frame includes a current frame or a future frame, and the future frame is, for example, an Nth frame after the current frame or Mth frame after the current frame, where M and N are positive integers. Optionally, the third signal can be carried in a SIG part of an uplink PPDU sent by the first device or in feedback information (e.g., an ACK frame) sent by the first device to the second device.

[0091] That is, after the first device adjusts the transmit power, the first device can send a signal to the second device based on the adjusted transmit power, and carry the currently used transmit power in the signal; or, the first device can determine the transmit power of the Nth frame after the current frame, or determine the transmit power of the M consecutive frames after the current frame, and inform the second device of the transmit power of the Nth frame after the current frame and the transmit power of the M consecutive frames after the current frame.

[0092] In some embodiments, if the specific frame is a future frame, the second device can send power accept information or power reject information to the first device after receiving the third signal; correspondingly, the first device receives the power accept information or the power reject information sent by the second device. The power accept information is used to indicate that the second device allows the transmit power of the specific frame, and the power reject information is used to indicate that the second device rejects the transmit power of the specific frame. If the first device receives the power accept information, the first device can use the determined transmit power when subsequently sending the specific frame; if the first device receives the power reject information, the first device will not use the determined transmit power when subsequently sending the specific frame.

[0093] Embodiment 2

[0094] In embodiment 2, the adjustment of the transmit power of the first device can be initiated by the second device.

[0095] In some scenarios, for example, AMP sensors, it is easy to control the power adjustment of the first device by the second device, because the first device will have multiple signal transmissions, and the second device can instruct the first device to gradually adjust the transmit power of the first device.

[0096] In some embodiments, the second device can send a power control signal to the first device; correspondingly, the first device receives the power control signal sent by the second device. The transmit power of the first device can be adjusted based on the power control signal or a signal associated with the power control signal.

[0097] The power control signal can be carried in a signaling part of a downlink PPDU transmitted by the second device, i.e., the power control signal corresponds to a field in a SIG part of the PPDU. Alternatively, the power control signal can be carried in a trigger frame transmitted by the second device. Alternatively, the power control signal can be carried in a poll frame transmitted by the second device. The power control signal can be included in a trigger frame or a poll frame transmitted by the second device when the second device triggers or polls the first device to transmit in uplink (UL Tx). For example, a MAC header or a part of a payload of the trigger frame or the poll frame can be used to carry the power control signal.

[0098] The second device can also implicitly indicate the transmit power of the first device, i.e., the power control signal is indicated in an implicit manner. For example, the first device can determine what level its transmit power needs to be adjusted to based on information associated with the power control signal. The information associated with the power control signal can include, for example, a synchronization signal sequence in a downlink PPDU carrying the power control signal. As an example, assume that there are two synchronization signal sequences in a PPDU transmitted by the second device, sequence 1 and sequence 2, sequence 1 is associated with a high transmit power level and sequence 2 is associated with a low transmit power level. When the first device receives the PPDU transmitted by the second device, if the synchronization signal sequence carried in the PPDU is sequence 1, the first device adjusts its transmit power to the high transmit power level, and if the synchronization signal sequence carried in the PPDU is sequence 2, the first device adjusts its transmit power to the low transmit power level.

[0099] The above implementation manners can also be combined to implement the control of the transmit power of the first device by the second device.

[0100] The above power control scheme can be for a single first device. However, in the case of a large number of first devices, for example, for an AMP device, the number of first devices is usually large. The second device can control different first devices to adjust the transmit power respectively. However, in order to improve efficiency, the second device can also control all the first devices in a group of devices simultaneously based on the group of devices. The grouping of the first devices can be based on, for example, the positions of the first devices, or the distances between the first devices and the second device. In this case, the power control signal transmitted by the second device can carry, for example, a group identifier of a group of devices associated with the power control signal to address the group of devices. In a more extreme case, the power control signal is carried in a broadcast frame (e.g., a beacon frame) transmitted by the second device, and the power control signal is broadcast to control the transmit power of all the first devices associated with the second device to be adjusted.

[0101] Embodiment 3

[0102] In embodiment 3, the power control of the first device by the second device can be indirectly implemented by a helper node between the first device and the second device.

[0103] The first device can transmit signals to the second device in a backscattering or active transmission manner. The carrier for backscattering, i.e., continuous wave (CW), can be sent by the second device or by a helper node between the first device and the second device.

[0104] In the case where the carrier for backscattering is provided by the helper node, the transmission power of the first device is related to two factors: 1) the transmission power of the helper node sending the carrier for backscattering; and 2) whether the first device has a power amplifier or a power amplifying factor.

[0105] Therefore, in some implementations, the second device can send a power control signal to the helper node; accordingly, the helper node receives the power control signal sent by the second device. The transmission power used by the helper node to send the carrier for backscattering can be adjusted based on the power control signal or a signal associated with the power control signal. The specific details of how the helper node adjusts its transmission power based on the power control signal or the signal associated with the power control signal are similar to the operation of the first device in embodiment 2, and will not be repeated here for brevity.

[0106] Since the helper node adjusts its transmission power based on the power control signal or the information associated with the power control signal, after the helper node sends the carrier for backscattering to the first device based on the adjusted transmission power, the transmission power used by the first device for backscattering is also equal to the adjusted transmission power. Therefore, by adjusting the transmission power of the helper node, the transmission power of the first device is also indirectly adjusted in the same way.

[0107] As an example, in the case where the first device does not have a power amplifier, the power control signal can be sent to the helper node instead of the first device, because the first device does not have the ability to adjust its transmission power by itself; in the case where the first device has a power amplifier, the power control signal can be sent to the first device, to the helper node, or to both the first device and the helper node.

[0108] The AMP device can be applied in smart home, smart manufacturing, logistics / warehouse and many other scenarios. The AMP device opens up a whole new market due to its ultra-low cost and maintenance-free characteristics. The technical solutions of the embodiments of the present application can be applied to such cost-effective and maintenance-free AMP devices, and the interested groups can include AMP Internet of Things device providers, companies operating large shopping centers, warehouse / logistics companies and smart home service providers, etc. For example, the technical solutions of the embodiments of the present application can be applied to an AMP tag-based communication system. By adjusting the transmission power of the AMP device, which is associated with the position of the AMP device or the distance between the AMP device and the AP, the hidden node problem of the AMP device is alleviated, and the interference of the AMP device to other devices is reduced.

[0109] The method embodiments of the present application are described in detail above in combination with FIG. 1 to FIG. 8, and the device embodiments of the present application are described in detail below in combination with FIG. 9 to FIG. 11. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, and therefore, the parts not described in detail can be referred to the method embodiments.

[0110] FIG. 9 is a structural schematic diagram of a communication device provided by an embodiment of the present application. The communication device 900 shown in FIG. 9 can be the second device described above, and includes a processing unit 910. The processing unit 910 is configured to adjust the transmission power, wherein the transmission power is associated with the distance between the first device and the second device.

[0111] In some implementations, the communication device 900 further includes a transceiver unit 920, configured to: send a first signal to the second device based on an initial power; and adjust the transmission power based on whether the first device receives feedback information sent by the second device for the first signal.

[0112] In some implementations, the transmission power is increased when the first device does not receive the feedback information, and the transmission power is kept or reduced when the first device receives the feedback information.

[0113] In some implementations, the transceiver unit 920 is further configured to: receive a second signal sent by the second device; and determine the initial power based on a measurement result of the second signal.

[0114] In some implementations, the second signal is a beacon frame sent by the second device.

[0115] In some implementations, the transceiver unit 920 is further configured to: send a third signal to the second device, wherein the third signal carries the transmission power determined by the first device for sending a specific frame.

[0116] In some embodiments, the specific frame comprises a current frame, an Nth frame after the current frame, or an Mth frame after the current frame.

[0117] In some embodiments, the third signal is carried in a signaling part of an uplink PPDU sent by the first device, or in feedback information sent by the first device.

[0118] In some embodiments, the transceiver 920 is further configured to receive power accept information or power reject information sent by the second device, wherein the power accept information is used to indicate that the second device allows the transmit power of the specific frame, and the power reject information is used to indicate that the second device rejects the transmit power of the specific frame.

[0119] In some embodiments, the communication device 900 further comprises a transceiver 920 configured to receive a power control signal sent by the second device, wherein the transmit power is adjusted based on the power control signal or a signal associated with the power control signal.

[0120] In some embodiments, the power control signal is carried in a signaling part of a downlink PPDU sent by the second device, or in a trigger frame sent by the second device, or in a poll frame sent by the second device.

[0121] In some embodiments, a MAC frame header or a payload of the trigger frame is used to carry the power control signal, and a MAC frame header or a payload of the poll frame is used to carry the power control signal.

[0122] In some embodiments, the information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

[0123] In some embodiments, the power control signal carries a group identifier of a group of devices associated with the power control signal, and / or the power control signal is carried in a broadcast frame sent by the second device.

[0124] In some embodiments, the transmit power is adjusted based on the following manner: adjusting the transmit power to be equal to a target power value in a predetermined plurality of power values; or increasing or decreasing the transmit power step by step based on a predetermined power interval.

[0125] In some embodiments, the first device is a STA, and the second device is an AP.

[0126] In some embodiments, the first device is an AMP device.

[0127] In some embodiments, the first device transmits signals to the second device based on a backscattering or an active transmission manner, a carrier for the backscattering being transmitted by the second device or by an assisting node between the first device and the second device.

[0128] It can be understood that the processing unit 910 may, for example, be the processor 1110. In addition, the communication device 900 optionally further comprises a memory 1120 and a transceiver 1130, as shown in FIG. 12.

[0129] FIG. 10 is a structural schematic diagram of a communication device according to another embodiment of the present application. The communication device 1000 shown in FIG. 10 may, for example, be the second device described above, and comprises a transceiving unit 1010. The transceiving unit 1010 is configured to transmit a power control signal, wherein a transmission power of a first device is adjusted based on the power control signal or a signal associated with the power control signal, the transmission power being associated with a distance between the first device and the second device.

[0130] In some embodiments, the power control signal is carried in: a signaling part of a downlink PPDU transmitted by the second device; or a trigger frame transmitted by the second device; or a polling frame transmitted by the second device.

[0131] In some embodiments, a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal.

[0132] In some embodiments, the information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

[0133] In some embodiments, the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame transmitted by the second device.

[0134] In some embodiments, the transmission power is adjusted based on: adjusting the transmission power to be equal to a target power value in a predetermined plurality of power values; or increasing or decreasing the transmission power step by step based on a predetermined power interval.

[0135] In some embodiments, the power control signal is transmitted to the first device; or the power control signal is transmitted to an assisting node between the first device and the second device, wherein the first device transmits signals to the second device based on a backscattering manner, a carrier for the backscattering being transmitted by the assisting node to the first device based on the transmission power.

[0136] In some implementations, the first device is a STA and the second device is an AP.

[0137] In some implementations, the first device is an AMP device.

[0138] In some implementations, the first device transmits signals to the second device based on a backscattering or an active transmission manner, a carrier for the backscattering being transmitted by the second device or by an assisting node between the first device and the second device.

[0139] It can be understood that the transceiver unit 1010 can be the transceiver 1130, for example. In addition, the communication device 1000 can further include a processor 1110 and a memory 1120, as shown in FIG. 12.

[0140] FIG. 11 is a structural schematic diagram of a communication device according to another embodiment of the present application. The communication device 1100 shown in FIG. 11 can be an assisting node between the first device and the second device, and includes a transceiver unit 1110. The transceiver unit 1110 is configured to receive a power control signal transmitted by the second device, wherein the first device transmits signals to the second device based on a backscattering manner, a carrier for the backscattering being transmitted by the assisting node, a transmission power of the carrier being adjusted based on the power control signal or a signal associated with the power control signal, and the transmission power being associated with a distance between the first device and the second device.

[0141] In some implementations, the power control signal is carried in: a signaling part of a downlink PPDU transmitted by the second device; or a trigger frame transmitted by the second device; or a polling frame transmitted by the second device.

[0142] In some implementations, a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal.

[0143] In some implementations, the information associated with the power control signal includes a synchronization signal sequence in a downlink PPDU carrying the power control signal.

[0144] In some implementations, the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame transmitted by the second device.

[0145] In some embodiments, the transmit power is adjusted based on a manner that: adjusting the transmit power to equal a target power value in a predetermined plurality of power values; or increasing or decreasing the transmit power step by step based on a predetermined power interval.

[0146] In some embodiments, the first device is a STA and the second device is an AP.

[0147] In some embodiments, the first device is an AMP device.

[0148] It can be understood that the transceiver unit 1010 can be, for example, the transceiver 1130. In addition, the communication device 1000 can further include a processor 1110 and a memory 1120, as shown in FIG. 12.

[0149] FIG. 12 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present application. The dashed line shown in FIG. 12 indicates that the unit or module is optional. The apparatus 1200 can be used to implement the method described in the above method embodiments. The apparatus 1200 can be, for example, a chip, a terminal device or a network device.

[0150] The apparatus 1200 can include one or more processors 1210. The processor 1210 can support the apparatus 1200 to implement the method described in the above method embodiments. The processor 1210 can be a general purpose processor or a dedicated processor. For example, the processor 1210 can be a central processing unit (CPU). Alternatively, the processor 1210 can also 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 gates or transistor logic components, discrete hardware components, etc. The general purpose processor can be a microprocessor or can be any conventional processor.

[0151] The apparatus 1200 can further include one or more memories 1220. The memory 1220 stores a program, which can be executed by the processor 1210, so that the processor 1210 performs the method described in the above method embodiments. The memory 1220 can be independent of the processor 1210, or can also be integrated in the processor 1210.

[0152] The apparatus 1200 can further include a transceiver 1230. The processor 1210 can communicate with other devices or chips through the transceiver 1230. For example, the processor 1210 can perform data transceiving with other devices or chips through the transceiver 1230.

[0153] The embodiments of the present application further provide a communication system. The communication system includes the first device and the second device. In some implementations, the system further includes other devices, such as a secondary node, interacting with the first device and the second device.

[0154] The embodiments of the present application further provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied in the first device, the second device or the secondary node provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the first device, the second device or the secondary node in the embodiments of the present application.

[0155] The embodiments of the present application further provide a computer program product. The computer program product includes a program. The computer program product can be applied in the first device, the second device or the secondary node provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the first device, the second device or the secondary node in the embodiments of the present application.

[0156] The embodiments of the present application further provide a computer program. The computer program can be applied in the first device, the second device or the secondary node provided by the embodiments of the present application, and the computer program causes the computer to execute the method performed by the first device, the second device or the secondary node in the embodiments of the present application.

[0157] It should be understood that the terms "system" and "network" can be used interchangeably in the embodiments of the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0158] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained through A, or A indirectly indicates B, for example, A indicates C, and B can be obtained through C, or A and B have an associated relationship.

[0159] In embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0160] In embodiments of the present application, the term "corresponding" can mean a direct or indirect corresponding relationship between the two, can also mean an associated relationship between the two, or can indicate a relationship with the indicated, configured, and the like.

[0161] In embodiments of the present application, "predefined" or "preconfigured" can be implemented by pre-saving corresponding codes, tables or other ways that can be used to indicate related information in devices (for example, including first devices and second devices), and the present application does not limit the specific implementation manner. For example, predefinition can refer to definition in a protocol.

[0162] In embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, which can include, for example, an LTE protocol, an NR protocol, and a related protocol applied to a future communication system, and the present application does not limit this.

[0163] In embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects before and after it.

[0164] In various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0165] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other means. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can be in another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed mutual ones can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0166] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment of the present application according to actual needs.

[0167] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0168] In the above embodiments, all or part can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part can be realized 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 the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium readable by a computer or a data storage device such as a server, data center, etc. containing one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)) or semiconductor media (such as solid state disk (SSD)) and the like.

[0169] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising: Comprising: The first device adjusts a transmission power, wherein the transmission power is associated with a distance between the first device and a second device.

2. The method of claim 1, wherein, The method further comprises: The first device sends a first signal to the second device based on an initial power; Wherein the transmission power is adjusted based on whether the first device receives feedback information sent by the second device for the first signal.

3. The method of claim 2, wherein, In a case that the first device does not receive the feedback information, the transmission power is increased; In a case that the first device receives the feedback information, the transmission power is kept or decreased.

4. The method according to claim 2 or 3, characterized in that, The method further comprises: The first device receives a second signal sent by the second device; Wherein the initial power is determined based on a measurement result of the second signal.

5. The method of claim 4, wherein, The second signal is a beacon frame sent by the second device.

6. The method according to any one of claims 2 to 5, characterized in that, The method further comprises: The first device sends a third signal to the second device, wherein the third signal carries transmission power determined by the first device for sending a specific frame.

7. The method of claim 6, wherein, The specific frame includes a current frame, an Nth frame after the current frame, or Mth frame after the current frame.

8. The method according to claim 6 or 7, characterized in that, The third signal is carried in a signaling part of an uplink physical layer protocol data unit (PPDU) sent by the first device, or in feedback information sent by the first device.

9. The method according to any one of claims 6 to 8, characterized in that, The method further comprises: The first device receives power accept information or power reject information sent by the second device, wherein the power accept information is used to indicate that the second device allows the transmission power of the specific frame, and the power reject information is used to indicate that the second device rejects the transmission power of the specific frame.

10. The method of claim 1, wherein, The method further comprises: The first device receives a power control signal sent by the second device; Wherein the transmission power is adjusted based on the power control signal or a signal associated with the power control signal.

11. The method of claim 10, wherein, The power control signal is carried in: A signaling part of a downlink PPDU sent by the second device; or, A trigger frame sent by the second device; or, A polling frame sent by the second device.

12. The method of claim 11, wherein, A MAC frame header or a payload of the trigger frame is used to carry the power control signal; A MAC frame header or a payload of the polling frame is used to carry the power control signal.

13. The method according to any one of claims 10 to 12, characterized in that, Information associated with the power control signal includes a synchronization signal sequence in a downlink PPDU carrying the power control signal.

14. The method of any one of claims 10 to 13, wherein, The power control signal carries group identification of a group of devices associated with the power control signal; and / or, The power control signal is carried in a broadcast frame sent by the second device.

15. The method according to any one of claims 1 to 14, characterized in that, The transmission power is adjusted in the following manner: Adjusting the transmission power to equal a target power value in a predetermined plurality of power values; Increasing or decreasing the transmission power step by step based on a predetermined power interval.

16. The method according to any one of claims 1 to 15, characterized in that, The first device is a station (STA), and the second device is an access point (AP).

17. The method of any one of claims 1 to 16, wherein, The first device is an ambient-powered AMP device.

18. The method of any one of claims 1 to 17, wherein, The first device transmits signals to the second device based on a backscattering or an active transmission manner, a carrier for the backscattering being transmitted by the second device or an assisting node between the first device and the second device.

19. A method of wireless communication, comprising: comprising: The second device transmits a power control signal, wherein a transmission power of the first device is based on the power control signal or a signal adjustment associated with the power control signal, the transmission power being associated with a distance between the first device and the second device. The power control signal is carried in:

20. The method of claim 19, wherein, a signaling part of a downlink PPDU transmitted by the second device; or, a trigger frame transmitted by the second device; or, a polling frame transmitted by the second device.

21. The method of claim 20, wherein: a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal. The information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

22. The method of any one of claims 19-21, wherein, 23. The method of any of claims 19 to 22, wherein: the power control signal carries a group identification of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame transmitted by the second device. The transmission power is adjusted based on:

24. The method of any one of claims 19-23, wherein, adjusting the transmission power to be equal to a target power value in a predetermined plurality of power values; and / or increasing or decreasing the transmission power step by step based on a predetermined power interval.

25. The method of any of claims 19 to 24, wherein: the power control signal is transmitted to the first device; or the power control signal is transmitted to an assisting node between the first device and the second device, wherein the first device transmits signals to the second device based on a backscattering manner, a carrier for the backscattering being transmitted by the assisting node to the first device based on the transmission power. The first device is a station (STA) and the second device is an access point (AP).

26. The method of any one of claims 19-25, wherein, The first device is an ambient-powered AMP device.

27. The method of any one of claims 19-26, wherein, The first device transmits signals to the second device based on a backscattering or an active transmission manner, a carrier for the backscattering being transmitted by the second device or an assisting node between the first device and the second device.

28. The method of any one of claims 19-27, wherein, comprising:

29. A method of wireless communication, comprising: An assisting node between the first device and the second device receives a power control signal transmitted by the second device, wherein the first device transmits signals to the second device based on a backscattering manner, a carrier for the backscattering being transmitted by the assisting node, a transmission power of the carrier being based on the power control signal or a signal adjustment associated with the power control signal, the transmission power being associated with a distance between the first device and the second device. The power control signal is carried in:

30. The method of claim 29, wherein, a signaling part of a downlink PPDU transmitted by the second device; or, a trigger frame transmitted by the second device; or, a polling frame transmitted by the second device. in a trigger frame sent by the second device; or in a poll frame sent by the second device.

31. The method of claim 30, wherein a MAC frame header or a payload of the trigger frame is used to carry the power control signal. a MAC frame header or a payload of the poll frame is used to carry the power control signal.

32. The method of any one of claims 29-31, wherein, information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

33. The method of any of claims 29-32, wherein the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame sent by the second device.

34. The method of any one of claims 29-33, wherein, the transmit power is adjusted based on: adjusting the transmit power to equal a target power value of a predetermined plurality of power values; and / or increasing or decreasing the transmit power in steps based on a predetermined power interval.

35. The method of any one of claims 29-34, wherein, the first device is a station (STA) and the second device is an access point (AP).

36. The method of any one of claims 29-35, wherein, the first device is an ambient powered (AMP) device.

37. A communications device, characterized by the communication device is a first device, comprising: a processing unit configured to adjust a transmit power, wherein the transmit power is associated with a distance between the first device and a second device.

38. The communication device of claim 37, wherein, the communication device further comprises a transceiver configured to: transmit a first signal to the second device based on an initial power; wherein the transmit power is adjusted based on whether the first device receives feedback information sent by the second device for the first signal.

39. The communication device of claim 38, wherein in a case that the first device does not receive the feedback information, the transmit power is increased; and in a case that the first device receives the feedback information, the transmit power is maintained or decreased.

40. The communication device of claim 38 or 39, wherein, the transceiver is further configured to: receive a second signal sent by the second device; wherein the initial power is determined based on a measurement result of the second signal.

41. The communication device of claim 40, wherein, the second signal is a beacon frame sent by the second device.

42. The communication device of any one of claims 38 to 41, wherein, the transceiver is further configured to: transmit a third signal to the second device, wherein the third signal carries a transmit power determined by the first device for transmitting a specific frame.

43. The communication device of claim 42, wherein, the specific frame comprises a current frame, an Nth frame after the current frame, or Mth frame after the current frame.

44. The communication device of claim 42 or 43, wherein, the third signal is carried in a signaling part of an uplink physical layer protocol data unit (PPDU) sent by the first device, or in feedback information sent by the first device.

45. The communication device of any one of claims 42 to 44, wherein, the transceiver is further configured to: receive power accept information or power reject information sent by the second device, wherein the power accept information indicates that the second device allows the transmit power of the specific frame, and the power reject information indicates that the second device rejects the transmit power of the specific frame.

46. The communications device of claim 37, wherein the communication device further comprises a transceiver configured to: receive a power control signal sent by the second device; wherein the transmit power is adjusted based on the power control signal or a signal associated with the power control signal.

47. The communication device of claim 46, wherein, the power control signal is carried in: a signaling part in a downlink PPDU sent by the second device; or a trigger frame sent by the second device; or a polling frame sent by the second device.

48. The communication device of claim 47, wherein a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal.

49. The communication device of any one of claims 46-48, wherein, information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

50. The communication device of any one of claims 46-49, wherein the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame sent by the second device.

51. The communication device of any one of claims 37 to 50, wherein, the transmit power is adjusted based on: adjusting the transmit power to be equal to a target power value in a predetermined plurality of power values; and / or increasing or decreasing the transmit power step by step based on a predetermined power interval.

52. The communication device of any one of claims 37 to 51, wherein, the first device is a station (STA) and the second device is an access point (AP).

53. The communication device of any one of claims 37 to 52, wherein, the first device is an ambient powered (AMP) device.

54. The communication device of any one of claims 37 to 53, wherein, the first device transmits signals to the second device based on backscattering or active transmission, a carrier for the backscattering being sent by the second device or by a helper node between the first device and the second device.

55. A communications device, characterized by the communication device is a second device, comprising: a transceiver configured to send a power control signal, wherein a transmit power of a first device is adjusted based on the power control signal or a signal associated with the power control signal, the transmit power being associated with a distance between the first device and the second device. the power control signal is carried in:

56. The communication device of claim 55, wherein, a signaling part in a downlink PPDU sent by the second device; or a trigger frame sent by the second device; or a polling frame sent by the second device.

57. The communication device of claim 56, wherein a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal. information associated with the power control signal comprises a synchronization signal sequence in a downlink PPDU carrying the power control signal.

58. The communication device of any one of claims 55 to 57, wherein, 59. The communication device of any one of claims 55-58, wherein the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame sent by the second device. the transmit power is adjusted based on:

60. The communication device of any one of claims 55 to 59, wherein, adjusting the transmit power to be equal to a target power value in a predetermined plurality of power values; and / or increasing or decreasing the transmit power step by step based on a predetermined power interval.

61. The communication device of any one of claims 55-60, wherein the power control signal is sent to the first device; or the power control signal is sent to a group of devices associated with the power control signal. The power control signal is sent to an auxiliary node between the first device and the second device, wherein the first device transmits signals to the second device in a backscattering manner, and a carrier for the backscattering is sent to the first device by the auxiliary node based on the transmission power.

62. The communication device of any one of claims 55 to 61, wherein, The first device is a station (STA), and the second device is an access point (AP).

63. The communication device of any one of claims 55 to 62, wherein, The first device is an ambient-powered (AMP) device.

64. The communication device of any one of claims 55 to 63, wherein, The first device transmits signals to the second device in a backscattering or active transmission manner, and a carrier for the backscattering is sent by the second device or an auxiliary node between the first device and the second device.

65. A communications device, characterized by The communication device is an auxiliary node between the first device and the second device, comprising: a transceiver configured to receive a power control signal sent by the second device, wherein the first device transmits signals to the second device in a backscattering manner, and a carrier for the backscattering is sent by the auxiliary node, and a transmission power of the carrier is adjusted based on the power control signal or a signal associated with the power control signal, and the transmission power is associated with a distance between the first device and the second device.

66. The communication device of claim 65, wherein, The power control signal is carried in: a signaling part in a downlink (DL) physical protocol data unit (PPDU) sent by the second device; or a trigger frame sent by the second device; or a polling frame sent by the second device.

67. The communication device according to claim 66, wherein: a MAC frame header or a payload of the trigger frame is used to carry the power control signal; and / or a MAC frame header or a payload of the polling frame is used to carry the power control signal.

68. The communication device of any one of claims 65 to 67, wherein, Information associated with the power control signal comprises a synchronization signal sequence in a downlink (DL) physical protocol data unit (PPDU) carrying the power control signal.

69. The communication device according to any one of claims 65 to 68, wherein: the power control signal carries a group identifier of a group of devices associated with the power control signal; and / or the power control signal is carried in a broadcast frame sent by the second device.

70. The communication device of any one of claims 65 to 69, wherein, The transmission power is adjusted in the following manner: adjusting the transmission power to be equal to a target power value in a predetermined plurality of power values; and / or increasing or decreasing the transmission power step by step based on a predetermined power interval.

71. The communication device of any one of claims 65 to 70, wherein, The first device is a station (STA), and the second device is an access point (AP).

72. The communication device of any one of claims 65 to 71, wherein, The first device is an ambient-powered (AMP) device.

73. A communications device, characterized by The communication device comprises a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to invoke the program in the memory and control the transceiver to receive or send signals, so that the communication device performs the communication device according to any one of claims 1 to 18.

74. A communications device, characterized by The communication device comprises a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to invoke the program in the memory and control the transceiver to receive or send signals, so that the communication device performs the method according to any one of claims 19 to 28.

75. A communications device, characterized by comprising a transceiver, a memory for storing a program, and a processor for invoking the program in the memory and controlling the transceiver to receive or send a signal, so that the communication device performs the method according to any one of claims 29-36.

76. An apparatus comprising: comprising a processor for invoking a program from a memory, so that the apparatus performs the method according to any one of claims 1-36.

77. A chip, comprising: comprising a processor for invoking a program from a memory, so that the apparatus performs the method according to any one of claims 1-36.

78. A computer-readable storage medium, characterized in that, having a program stored thereon, which causes a computer to perform the method according to any one of claims 1-36.

79. A computer program product, characterised in that, comprising a program which causes a computer to perform the method according to any one of claims 1-36.

80. A computer program, characterized in that, The computer program causes a computer to perform the method according to any one of claims 1-36. The computer program causes a computer to perform the method according to any one of claims 1-36.

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