Power control method and device, communication equipment, chip and storage medium

Abstract

The invention discloses a power control method and device, communication equipment, a chip and a computer readable storage medium, and the method comprises the steps: receiving a first message sent by second equipment, the first message being used for determining the transmitting power of the second equipment to a carrier wave and the expected receiving power of the second equipment to the carrier wave; and determining the expected reflection power of the first device to the carrier according to the transmitting power of the second device to the carrier, the expected receiving power of the second device to the carrier and the receiving power of the first device to the carrier.

Description

Technical Field

[0001] This application relates to the field of wireless Internet of Things technology, and in particular, to a power control method, device, communication device, chip, and storage medium. Background Art

[0002] The passive Internet of Things (IoT) studied by the 3rd Generation Partnership Project (3GPP) is named Ambient IoT. The types of Ambient IoT devices include Class A Ambient IoT devices (abbreviated as Device A), Class B Ambient IoT devices (abbreviated as Device B), and Class C Ambient IoT devices (abbreviated as Device C). Among them, Device A and Device B use the backscattering mechanism for communication, that is, Device A and Device B reflect the received signal to achieve communication; Device C actively generates and sends signals to achieve communication.

[0003] The power of the signal reflected or sent by the Ambient IoT device is relatively large, which will cause interference to other signals. On the contrary, if the power of the signal reflected or sent by the Ambient IoT device is relatively small, the communication quality cannot be guaranteed. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application provide a power control method, device, communication device, chip, and storage medium.

[0005] In a first aspect, an embodiment of the present application provides a power control method, which is applied to a first device; the method includes:

[0006] Receiving a first message sent by a second device, where the first message is used to determine the transmission power of the second device for a carrier wave and the expected received power of the second device for the carrier wave;

[0007] Determining the expected reflection power of the first device for the carrier wave according to the transmission power of the second device for the carrier wave, the expected received power of the second device for the carrier wave, and the received power of the first device for the carrier wave.

[0008] In a second aspect, an embodiment of the present application provides a power control method, which is applied to a third device; the method includes:

[0009] Receiving a third message sent by a second device, where the third message is used to determine a target signal-to-noise ratio and a target noise figure;

[0010] Determine the expected transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

[0011] In a third aspect, an embodiment of the present application provides a power control method, which is applied to a second device; the method includes:

[0012] Send a first message, where the first message is used to determine the transmission power of the second device for the carrier wave and the expected reception power of the second device for the carrier wave;

[0013] Among them, the transmission power of the second device for the carrier wave, the expected reception power of the second device for the carrier wave, and the reception power of the first device for the carrier wave are used to determine the expected reflection power of the first device for the carrier wave.

[0014] In a fourth aspect, an embodiment of the present application provides a power control method, which is applied to a second device; the method includes:

[0015] Send a third message, where the third message is used to determine the target signal-to-noise ratio and the target noise figure;

[0016] Among them, the target signal-to-noise ratio and the target noise figure are used to determine the expected transmission power of the third device for the radio frequency signal.

[0017] In a fifth aspect, an embodiment of the present application provides a power control device, which is applied to a first device; the device includes:

[0018] A receiving unit, configured to receive a first message sent by a second device, where the first message is used to determine the transmission power of the second device for the carrier wave and the expected reception power of the second device for the carrier wave;

[0019] A determining unit, configured to determine the expected reflection power of the first device for the carrier wave according to the transmission power of the second device for the carrier wave, the expected reception power of the second device for the carrier wave, and the reception power of the first device for the carrier wave.

[0020] In a sixth aspect, an embodiment of the present application provides a power control device, which is applied to a third device; the device includes:

[0021] A receiving unit, configured to receive a third message sent by a second device, where the third message is used to determine the target signal-to-noise ratio and the target noise figure;

[0022] A determining unit, configured to determine the expected transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

[0023] In a seventh aspect, an embodiment of the present application provides a power control device, which is applied to a third device; the device includes:

[0024] A sending unit, configured to send a first message, where the first message is used to determine the transmission power of a second device for a carrier wave and the expected received power of the second device for the carrier wave;

[0025] Wherein, the transmission power of the second device for the carrier wave, the expected received power of the second device for the carrier wave, and the received power of a first device for the carrier wave are used to determine the expected reflected power of the first device for the carrier wave.

[0026] In a fifth aspect, an embodiment of the present application provides a power control device, which is applied to a third device; the device includes:

[0027] A sending unit, configured to send a third message, where the third message is used to determine a target signal-to-noise ratio and a target noise figure; wherein, the target signal-to-noise ratio and the target noise figure are used to determine the expected transmission power of the third device for a radio frequency signal.

[0028] In a sixth aspect, a communication device provided by an embodiment of the present application includes: a processor and a memory, where the memory is used to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute any one of the above power control methods.

[0029] In a seventh aspect, a chip provided by an embodiment of the present application includes: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes any one of the above methods.

[0030] In an eighth aspect, a computer-readable storage medium provided by an embodiment of the present application is used to store a computer program, and the computer program enables a computer to execute any one of the above methods.

[0031] In the above technical solutions of the embodiments of the present application, on the one hand, the first device determines the transmission power of the second device for the carrier wave and the expected received power of the second device for the carrier wave through the first message of the second device, so that the expected reflected power of the first device for the carrier wave can be determined according to the transmission power of the second device for the carrier wave, the expected received power of the second device for the carrier wave, and the received power of the first device for the carrier wave, realizing power control of the signal reflected by the first device, reducing the interference caused by the signal reflected by the first device to other signals, and at the same time, the communication quality of the first device can be ensured. On the other hand, the third device determines the target signal-to-noise ratio and the target noise figure through the third message of the second device, so that the expected transmission power of the third device for the radio frequency signal can be determined according to the target signal-to-noise ratio and the target noise figure, realizing power control of the signal transmitted by the third device, reducing the interference caused by the signal transmitted by the third device to other signals, and at the same time, the communication quality of the third device can be ensured. Description of the Drawings

[0032] The accompanying drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application.

[0033] Figure 1 It is a schematic flow diagram of the communication process between Device A and Device B and the EPC C1G2 protocol provided by an embodiment of the present application;

[0034] Figure 2 It is a schematic flow diagram of the power control method provided by an embodiment of the present application Figure 1 ;

[0035] Figure 3 It is a schematic diagram of the composition of the first message provided by an embodiment of the present application;

[0036] Figure 4 It is a schematic flow diagram of the power control method provided by an embodiment of the present application Figure 2 ;

[0037] Figure 5 It is a schematic diagram of the composition of the third message provided by an embodiment of the present application;

[0038] Figure 6 It is a schematic flow diagram of the power control method provided by an embodiment of the present application Figure 3 ;

[0039] Figure 7 It is a schematic diagram of a method for inventory tags provided by an embodiment of the present application;

[0040] Figure 8 It is a schematic flow diagram of the power control method provided by an embodiment of the present application Figure 4 ;

[0041] Figure 9 Schematic diagram of the structural composition of the power control device provided by an embodiment of the present application Figure 1 ;

[0042] Figure 10 Schematic diagram of the structural composition of the power control device provided by an embodiment of the present application Figure 2 ;

[0043] Figure 11 Schematic diagram of the structural composition of the power control device provided by an embodiment of the present application Figure 3 ;

[0044] Figure 12 Schematic diagram of the structural composition of the power control device provided by an embodiment of the present application Figure 4 ;

[0045] Figure 13 It is a schematic structural diagram of a communication device provided by an embodiment of the present application;

[0046] Figure 14 It is a schematic structural diagram of the chip according to an embodiment of the present application. Detailed implementation manners

[0047] It should be noted that the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and back associated objects. It should also be understood that the "indication" mentioned in this article can be a direct indication, an indirect indication, or a representation of an association relationship. For example, A indicates B, which can mean that A directly indicates B. For example, B can be obtained through A; it can also mean that A indirectly indicates B. For example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B. It should also be understood that the "protocol" mentioned in this article can refer to standard protocols in the communication field. For example, it can include the NR protocol and related protocols applied to future communication systems. The present application does not make any limitations in this regard.

[0048] To facilitate the understanding of the technical solutions of the embodiments of the present application, the related technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0049] 1. Passive IoT

[0050] Based on the idea that everything can be connected to the network, the Internet of Things (IoT) aims to achieve the interconnection of all things as the ultimate goal and has helped hundreds of millions of devices achieve interconnection. However, with the booming growth of the market scale, problems such as device power supply and battery life are becoming new challenges for the development of the IoT. It can be said that how to achieve a network with low power consumption, low cost, and long life cycle has become the key to be urgently broken through in the next stage of the IoT.

[0051] In this context, low-power IoT began to germinate. After development, a series of mature low-power IoT technologies represented by Bluetooth Low Energy (BLE), Long Range Radio (LoRa), Narrow Band IoT (NB-IoT), Reduced Capability (RedCap), etc. have been formed.

[0052] Although the above-mentioned low-power Internet of Things technology aims to achieve low power consumption and large connection in the Internet of Things, with the continuous iteration of technology and the increase in 5G industry applications, the types of connected objects are becoming more and more diverse, and higher requirements will also be placed on the price and power consumption of communication terminals. Based on these backgrounds, passive Internet of Things has started to enter the industrial stage and has gradually become a focus of attention. Passive Internet of Things uses ambient energy harvesting technology to convert the available energy around it into electrical energy that can drive its own circuit. In passive Internet of Things, the communication mode centered on scattering can be used to transmit information to the target node. The most significant feature of passive Internet of Things is that it does not rely on traditional battery power supply, which can well solve the bottleneck problems in the development of low-power Internet of Things. It is a key technology for the development of the next-generation Internet of Things and has wide applications in fields such as intelligent warehousing, logistics, and asset management.

[0053] 2. Radio Frequency Identification (RFID)

[0054] The improvement and application of radar have given rise to the most representative passive Internet of Things technology - RFID. An RFID system consists of tags, readers, and a control platform. The reader uses the principle of inductive coupling or backscatter coupling to send electromagnetic wave signals to the tags. The tags convert the electromagnetic wave signals into energy, activate the tag chips, and feedback information to achieve tag identification. Mainstream RFID systems can support multiple frequency bands. Among them, the ultra-high frequency (850 MHz - 910 MHz) RFID system is based on electromagnetic wave backscatter technology, with a theoretical transmission distance of 1 - 10 meters and a wide range of applications, covering many industries such as logistics, manufacturing, and aviation.

[0055] 3. Ambient IoT

[0056] The passive Internet of Things studied by the 3rd Generation Partnership Project (3GPP) is named Ambient IoT. It should be noted that the "passive Internet of Things" in the embodiments of this application can be "Ambient IoT". The expressions of "passive Internet of Things" and "Ambient IoT" can be replaced with each other.

[0057] The standard progress of each working group of 3GPP is as follows:

[0058] In the standard TR 22.840, several application scenarios of Ambient IoT are defined, generally including indoor scenarios and outdoor scenarios. Among them, indoor scenarios (or called local scenarios) include inventory, electronic price tags, indoor small item search, etc., and outdoor scenarios (or called wide-area scenarios) include logistics transportation, public facility monitoring, intelligent pastures, etc. The application scenarios of Ambient IoT may be further updated in the future.

[0059] In the standard TR 38.848, three types of Ambient IoT device are defined. The definitions of the three types of Ambient IoT device are shown in Table 1 below.

[0060] Table 1: Definitions of Ambient IoT Device Types

[0061]

[0062]

[0063] As shown in Table 1, the three types of Ambient IoT device include Ambient IoT Device Type A (abbreviated as Type A in Table 1), Ambient IoT Device Type B (abbreviated as Type B in Table 1), and Ambient IoT Device Type C (abbreviated as Type C in Table 1). These three types of Ambient IoT device are defined by four dimensions: "whether it has energy storage capacity", "whether it has the ability to actively send signaling", "device complexity", and "power consumption".

[0064] Ambient IoT Device Type A can also be abbreviated as Device A, Ambient IoT Device Type B can also be abbreviated as Device B, and Ambient IoT Device Type C can also be abbreviated as Device C. Device A and Device B communicate with the reader using backscattering. The difference between the two is that Device B has stronger energy storage capacity and backscatter amplification ability; Device C has an independent signal generator and can actively communicate with the reader without using backscattering.

[0065] It should be noted that "UE", "passive Internet of Things device", "Ambient IoT device", and "tag" can be used interchangeably.

[0066] Systems similar to the Ambient IoT system are the second-generation protocol of the evolving Electronic Product Code (Electronic Product Code global Class 1 Generation 2, EPC C1G2), and the Ultra High Frequency (UHF) RFID system, such as the internationally renowned standardization organization / International Electrotechnical Commission (International Organization for Standardization / International Electrotechnical Commission, ISO / IEC) 18000-6C system. They also use backscatter communication technology to achieve communication between tags and readers. Through the slotted Aloha method, tags are allowed to randomly reflect the signals sent by the reader, and the load modulation method is used to interact with the base station for information.

[0067] In a traditional RFID system, it mainly consists of tags, readers, and back-end applications. Among them, the back-end application is responsible for controlling the reader to issue commands and receiving the tag inventory results sent back by the reader. The reader is responsible for inventorying tags. The tag stores a unique identification code, usually the Electronic Product Code (EPC). The reader and the tag communicate through backscatter communication, and the tag has a certain storage capacity and processing capacity.

[0068] The reader inventories the tags by sending commands such as Select, Query, QueryRep, QueryAdjust, and ACK to the tags. Among them, the Select command is responsible for selecting a specific tag from the tag family; the Query command allows the selected tag to generate a random number; QueryRep and QueryAdjust respectively decrement the random number and adjust the size of the random number; finally, when the random number becomes zero, the tag sends a new random number RN16 for identification to the reader; the reader replies with ACK and the RN16 of the corresponding tag. After receiving ACK and its own RN16, the tag sends its EPC. The reader then transmits the EPC back to the back-end application or sends a handle for further communication. Generally, when the tag sends its EPC to the reader, it is considered that an inventory has been completed.

[0069] According to the current standard progress, 3GPP Ambient IoT devices are most likely to choose to use technologies similar to UHF RFID or EPC C1G2 and enhance them.

[0070] Figure 1 It is a schematic diagram of the communication process for Device A and Device B and the EPC C1G2 protocol. Figure 1The network elements involved are the reader and the tag. The following describes Figure 1 the process. Step 1: The reader sends a Query, QueryAdjust, or QueryRep command. After the tag receives these commands, Step 2: If the time slot = 0, the tag replies to the reader with a random number RN16. If the time slot <> 0, the tag does not reply. When the tag replies to the reader with RN16, Step 3: The reader sends an acknowledgment message ACK(RN16) containing the same RN16. After the tag receives ACK(RN16), Step 4: If RN16 is valid, the tag sends {PC / XPC, EPC}. If RN16 is invalid, the tag does not reply. When the reader receives the tag's reply, Step 5: The reader sends Req_RN containing the same RN16. After the tag receives Req_RN(RN16), Step 6: If RN16 is valid, the tag replies with handle. If RN16 is invalid, the tag does not reply. If the tag sends handle to communicate further with the reader, Step 7: The reader accesses the tag with a command carrying handle. When the tag receives command(handle), Step 8: The tag verifies handle for commands where the tag replies with an incorrect handle.

[0071] In passive IoT, due to the existence of multiple tag types, among which Class A and Class B tags need to rely on environmental energy, usually using the radio frequency continuous wave (Continuous Wave, CW) provided by the reader to transfer energy, and the tag uses load modulation and backscattering. Class C tags generate radio frequency signals to communicate with the reader. In actual construction, the reader may be located at the gNB. At this time, considering the interference between Ambient IoT devices and other NR UEs, the interference between Class A, B, and C tags, and the interference inside Class A and B tags, it is beneficial to introduce power control (whether open-loop or closed-loop). Especially in Ambient IoT, the self-interference is relatively large, and the near-far effect is more likely to occur.

[0072] In the initial design of the RFID protocol, since it mainly considered short-distance communication, mostly within 1 meter, power control was not considered. In 3GPP, since it needs to support passive, semi-passive, and active tags simultaneously and cover a distance of up to 10 meters to 200 meters, the near-far effect will be more obvious than in a pure passive environment.

[0073] Tag power control is divided into two categories according to whether the tag's communication method is backscattering communication. The first category uses backscattering communication, and the second category does not use backscattering communication (actively generates radio frequency signals); the first category of tags corresponds to device A and B in 3GPP, and the second category of tags corresponds to device C.

[0074] In order to further reduce the interference between tags, the following technical solutions of the embodiments of the present application are proposed.

[0075] It should be noted that although this article uses the examples of Device A, Device B, and Device C for illustration, the technical solutions of the embodiments of the present application are not limited thereto, and the technical solutions of the embodiments of the present application can also be applied to other tags.

[0076] It should be noted that the "carrier wave" described in the embodiments of the present application is used to energize the first device. In some embodiments, the carrier wave can also be referred to as an energizing wave.

[0077] Figure 2 is a flowchart of the power control method provided by the embodiments of the present application Figure 1 , and this method is applied to the first device; as Figure 2 shown, this method includes the following steps:

[0078] Step 201: Receive a first message sent by the second device.

[0079] Here, the first message is used to determine the transmission power of the carrier wave of the second device and the expected received power of the carrier wave of the second device.

[0080] In some embodiments, if power control is performed on the first device, the second device needs to carry the carrier wave transmission power information of the second device and the expected received power in the first message. Among them, the transmission power and the expected received power can be the transmission power level or the specific transmission power, and the expected received power can appear as needed or periodically to adjust the reflection power of the first device in real time. In some embodiments, the first message can be carried in a message similar to Query / QueryRep or other messages that require a response from the first device, or can also be carried in a CW wave (or other carrier wave), because the appearance of the CW wave often means that the second device expects a response from the first device.

[0081] Step 202: Determine the expected reflection power of the first device for the carrier wave according to the transmission power of the carrier wave of the second device, the expected received power of the carrier wave of the second device, and the received power of the carrier wave of the first device.

[0082] In some embodiments, the target path loss between the first device and the second device is determined according to the transmission power of the carrier wave of the second device and the received power of the carrier wave of the first device.

[0083] The expected reflection power of the first device for the carrier wave is determined according to the target path loss and the expected received power of the carrier wave of the second device.

[0084] In some embodiments, after the first device receives the first message, based on the transmit power of the carrier it receives and in combination with the carrier transmit power in the first message, the target path loss can be obtained, and its calculation method is as follows:

[0085] Target path loss = Carrier transmit power - Carrier power received by the first device;

[0086] After that, the first device can determine its expected reflection power, and its calculation method is as follows:

[0087] Expected reflection power = Expected received power + Target path loss;

[0088] Where the expected received power is the expected received power of the second device for the carrier determined according to the first message.

[0089] In some embodiments, the first message carries first information and second information. The first information includes the transmit power of the carrier by the second device, and the second information includes the expected received power of the carrier by the second device;

[0090] Then, determine the transmit power of the carrier by the second device according to the first information; determine the expected received power of the carrier by the second device according to the second information.

[0091] In some embodiments, for the power-related information in this application, there are two implementation manners: directly giving the value of the power or giving the level information of the power. There may also be other implementation manners, and this application does not make specific limitations thereto.

[0092] In some embodiments, if the first information includes the transmit power of the carrier by the second device, then directly determine the transmit power of the carrier by the second device according to the first information, or if the first information includes the level information of the transmit power of the carrier by the second device, then determine the transmit power of the carrier by the second device according to the level information. If the second information includes the expected received power of the carrier by the second device, then directly determine the expected received power of the carrier by the second device according to the second information, or if the second information includes the level information of the expected received power of the carrier by the second device, then determine the expected received power of the carrier by the second device according to the level information. The specific correspondence between the level information and the power can be determined according to the actual situation and is not specifically limited herein.

[0093] In some embodiments, the first message carries first information and third information. The first information includes the transmit power of the carrier by the second device, and the third information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of received power and path loss with a corresponding relationship;

[0094] Determine the transmit power of the carrier by the second device according to the first information;

[0095] Determine a path loss closest to the target path loss from multiple groups of information according to the third information and the target path loss between the first device and the second device, and use the received power corresponding to the closest path loss as the expected received power of the second device for the carrier wave.

[0096] In some embodiments, the first message includes the third information, and the third information includes multiple pairs of target received power - path loss. The first device measures the received carrier signal, compares it with the carrier power information carried in the first message, and the difference between the two can obtain the target path loss between the first device and the second device. The calculation formula of the target path loss is as described above and will not be elaborated here. Then, the target received power corresponding to the path loss closest to the calculation result can be selected upward or downward from the corresponding target received power - path loss. Then, the first device determines its own expected reflection power by combining the measured target path loss and target received power. The calculation method of the expected reflection power is as described above and will not be elaborated here. According to this method, the transmission power on the first device at different positions can be controlled according to the path loss to achieve overall interference reduction.

[0097] Determine the expected reflectivity of the first device for the carrier wave according to the expected reflection power of the first device for the carrier wave and the received power of the first device for the carrier wave.

[0098] In some embodiments, the first device determines the expected reflectivity of the first device for the carrier wave according to the expected reflection power and the carrier power received by the first device. The calculation method of the expected reflectivity is as follows:

[0099] Expected reflectivity = expected reflection power / carrier power received by the first device;

[0100] According to the expected reflectivity of the first device for the carrier wave, adjust the load capacitance and / or load resistance of the antenna of the first device, and perform backscattering on the carrier wave through the adjusted antenna; or,

[0101] According to the expected reflectivity of the first device for the carrier wave, select an antenna from multiple antennas of the first device, and perform backscattering on the carrier wave through the selected antenna, where different antennas among the multiple antennas correspond to different reflectivities.

[0102] In some embodiments, if the first device can adjust the reflectivity, the method for the first device to control its reflection power is to control the reflectivity of the first device by adjusting the load capacitance and / or load resistance, so as to ensure that the desired reflection power of the first device is near the calculation result. If the first device does not support adjusting the reflectivity, it is recommended that the first device be built-in with multiple antennas having different reflectivities, and calculate the desired reflectivity based on the desired reflection power and the carrier power received by the first device, and select a suitable antenna. If the first device is built-in with multiple antennas, the first device can select a suitable antenna according to the characteristic parameters of the antenna to communicate with the second device.

[0103] In some embodiments, a second message sent by the second device is received. The second message carries the identification code of the first device and a reflection power threshold, and the reflection power threshold includes a maximum reflection power and / or a minimum reflection power; wherein, the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

[0104] In some embodiments, the second device can also send a second message to control the maximum and minimum reflection powers of the first device, and the content carried therein is the identification code of the second device, and the maximum and / or minimum reflection powers. After the first device that conforms to the identification code of the second device receives the second message, it performs backscattering according to the power upper limit or lower limit value specified in the second message. The specific identification code carried can be determined according to the actual situation, and the present application does not make specific limitations thereto.

[0105] The technical solution of the embodiment of the present application proposes a power control method applied to a first device, which receives a first message sent by a second device to determine the transmission power of the second device for the carrier wave and the desired received power of the second device for the carrier wave; thereby, according to the transmission power of the second device for the carrier wave, the desired received power of the second device for the carrier wave, and the received power of the first device for the carrier wave, the desired reflection power of the first device for the carrier wave can be determined. The power control of the signal reflected by the first device is realized, the interference caused by the signal reflected by the first device to other signals is reduced, and at the same time, the communication quality of the first device can be guaranteed.

[0106] Exemplarily, the first device is a backscattering tag, corresponding to Device A and Device B in 3GPP, the second device is a reader-writer corresponding to sending the first message to the tag, and the carrier wave is a CW wave.

[0107] The backscatter tag receives a first message sent by the reader. The first message is used to determine the transmission power of the CW wave by the reader and the expected received power of the CW wave by the reader. The reader carries the CW wave transmission power information of the reader and the expected received power in the first message. The transmission power and the expected received power can be transmission power levels or specific transmission powers. The expected received power can appear on demand or periodically to adjust the reflection power of the tag in real time. The first message can be carried in a message similar to Query / QueryRep or other messages that require a tag response, or it can be carried in the CW wave, because the appearance of the CW wave often means that the reader expects a response from the backscatter tag.

[0108] After the backscatter tag receives the first message, based on the transmission power of the CW wave it receives and combining the CW wave transmission power in the first message, it can obtain the target path loss. The calculation method is as follows:

[0109] Target path loss = CW wave transmission power - CW wave power received by the backscatter tag;

[0110] After that, the backscatter tag can determine its expected reflection power. The calculation method of its expected reflection power is as follows:

[0111] Expected reflection power = Expected received power + Target path loss;

[0112] Where the expected received power is the expected received power of the CW wave by the reader determined according to the first message.

[0113] The first message can also broadcast the paired target received power - path loss. Figure 3 This is a schematic diagram of the composition of the first message provided by the embodiment of the present application, including a command block, three groups of received powers and their corresponding path losses, namely: path loss 1 - target received power 1, path loss 2 - target received power 2, path loss 3 - target received power 3, CW wave transmission power, and CW wave. The backscatter tag compares the CW wave power information carried in the first message according to the received CW wave signal, and the difference between the two can obtain the path loss between the backscatter tag and the reader. Then it can select the target received power corresponding to the path loss closest to the calculation result from the corresponding target received power - path loss upward or downward. After that, the backscatter tag determines its own reflection power by combining the measured path loss and the target received power. According to this method, the transmission power on tags at different positions can be controlled according to the path loss, and overall interference can be reduced.

[0114] The backscatter tag determines the expected reflectivity of the CW wave by the backscatter tag according to the expected reflection power and the CW wave power received by the backscatter tag. The calculation method of the expected reflectivity is as follows:

[0115] Desired reflectivity = Desired reflected power / CW wave power received by the backscatter tag;

[0116] The method for the backscatter tag to control its reflected power is to control the reflectivity of the backscatter tag by adjusting the load capacitance or load resistance, and ensure that the reflected power of the backscatter tag is near the calculated result. If the backscatter tag does not support adjusting the reflectivity, it is recommended that the backscatter tag be built-in with multiple antennas with different reflectivities, calculate the desired reflectivity based on the desired reflected power and the CW wave power received by the backscatter tag, select a suitable antenna. If the backscatter tag has multiple built-in antennas, the backscatter tag can select a suitable antenna according to the characteristic parameters of the antenna to communicate with the reader.

[0117] In addition, the reader can also send a second message to control the maximum and minimum reflected powers of the backscatter tag. The content carried is the identification code of the backscatter tag (which can be identification parameters such as EPC, RN16, etc.), and the maximum and / or minimum reflected powers. After receiving the second message, the backscatter tag that conforms to the identification code of the backscatter tag performs backscattering according to the power upper limit or lower limit value specified in the second message. The main function of the second message is to facilitate energy saving for Device B type tags and control the power range of a single tag.

[0118] The main purpose of the second message is to reduce the interference between backscatter devices in ambient energy communication devices. Since the main interference source in backscatter communication comes from intra-system interference, and intra-system interference is further divided into interference between the reader and the tag and interference inside the tag. It is difficult to eliminate the interference between the reader and the tag using power control strategies, but the interference inside the tag can be reduced to a certain extent by increasing the reflected power of the target tag and decreasing the reflected power of other tags. By using the second message to limit the reflected power of some tags, the communication quality of other tags can be improved.

[0119] The technical solution of the embodiment of the present application proposes a power control method for a backscatter tag, which receives a first message sent by a reader to determine the transmission power of the reader for the CW wave and the desired received power of the reader for the CW wave; determines the desired reflected power of the backscatter tag for the CW wave according to the transmission power of the reader for the CW wave, the desired received power of the reader for the CW wave, and the received power of the backscatter tag for the CW wave. In this way, power control of the signal reflected by the backscatter tag is achieved, the interference caused by the signal reflected by the backscatter tag to other signals is reduced, and at the same time, the communication quality of the backscatter tag can be guaranteed.

[0120] Figure 4 It is a flow schematic of the power control method provided by the embodiment of the present application Figure 2 and this method is applied to a third device; as Figure 4As shown, the method includes the following steps:

[0121] Step 401: Receive a third message sent by a second device, where the third message is used to determine a target signal-to-noise ratio and a target noise figure.

[0122] Step 402: Determine the desired transmission power of a third device for a radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

[0123] In some embodiments, the third message carries first information, and the first information includes the transmission power of the second device for a carrier wave;

[0124] Determining the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure includes:

[0125] Determine a target path loss between the third device and the second device according to the transmission power of the second device for the carrier wave and the received power of the third device for the carrier wave;

[0126] Determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio, the target noise figure, and the target path loss.

[0127] In some embodiments, the third device can read the first information in the third message carried in the carrier wave. The first information includes the transmission power of the second device for the carrier wave. Combining with the received power of the carrier wave, the target path loss can be obtained, and its calculation method is as follows:

[0128] Target path loss = Carrier transmission power - Carrier power received by the third device;

[0129] It should be noted that the third device can obtain the received power of the carrier wave according to the collected energy.

[0130] The second device can use the third message to broadcast the target signal-to-noise ratio and the target noise figure of the third device. Combining with the calculated target path loss, the desired transmission power can be obtained, and its calculation method is as follows:

[0131] Desired transmission power = Target signal-to-noise ratio × Bandwidth × Target noise figure + Target path loss;

[0132] The third device will use this power to communicate with the second device initially. If this power cannot obtain a response from the second device, the third device can actively increase the transmission power. In some embodiments, the third device increases the transmission power sequentially according to the set step size until a response from the second device is obtained. The specific setting of the step size can be determined according to the actual situation, and the present application does not make a specific limitation on this.

[0133] In some embodiments, the third message carries fourth information, and the fourth information includes a target signal-to-noise ratio and a target noise figure; the target signal-to-noise ratio and the target noise figure are determined according to the fourth information.

[0134] In some embodiments, the second device obtains the target signal-to-noise ratio and the target noise figure through the fourth information carried in the third message, then obtains the transmit power of the carrier through the first information carried in the first message, and obtains the target path loss and the desired transmit power through the target signal-to-noise ratio, the target noise figure, and the transmit power. The specific calculation method is as described above and will not be elaborated here.

[0135] In some embodiments, the third message carries fifth information, and the fifth information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of corresponding signal-to-noise ratio, noise figure, and path loss.

[0136] According to the fifth information and the target path loss between the third device and the second device, a path loss closest to the target path loss is determined from the multiple groups of information, and the signal-to-noise ratio and the noise figure corresponding to the closest path loss are used as the target signal-to-noise ratio and the target noise figure.

[0137] In some embodiments, the third message carries fifth information, and the fifth information includes multiple groups of corresponding signal-to-noise ratios, noise figures, and path losses. The target path loss of the third device is determined according to the transmit power of the carrier obtained from the third message, then a path loss closest to the target path loss is selected from the multiple groups of correspondences in the fifth information, and the signal-to-noise ratio and the noise figure corresponding to the path loss are used as the target signal-to-noise ratio and the target noise figure, and then the target transmit power of the second device is obtained. The specific calculation methods of the target path loss and the target transmit power are as described above and will not be elaborated here. In some embodiments, the second device is an active tag.

[0138] In some embodiments, the third device receives a fourth message sent by the second device, and the fourth message carries the identification code and the transmit power adjustment value of the first device.

[0139] The desired transmit power of the third device for the radio frequency signal is adjusted according to the transmit power adjustment value.

[0140] In some embodiments, the method of controlling the transmit power of the third device is to use the transmit power offset or the transmit power value in the fourth message. Since the fourth message is for a specific third device, the identification information of the third device also needs to be included. After receiving the fourth message that conforms to its identification information, the third device needs to actively adjust the transmit power according to the instructions in the fourth message.

[0141] In some embodiments, if the transmission power adjustment value carried in the fourth message is a power offset, the calculation method of the transmission power value to be adjusted is as follows:

[0142] The transmission power value to be adjusted = the current power value + (or -) the power offset;

[0143] Then, the desired transmission power is adjusted according to the transmission power value to be adjusted.

[0144] In some embodiments, if the fourth message carries the transmission power value to be adjusted, the desired transmission power is directly adjusted according to this transmission power value.

[0145] The technical solution of the embodiment of the present application proposes a power control method for a third device. The third device receives a third message sent by a second device to determine the target signal-to-noise ratio and the target noise figure; thus, the desired transmission power of the third device for the radio frequency signal can be determined according to the target signal-to-noise ratio and the target noise figure. The power control of the signal transmitted by the third device is realized, the interference caused by the signal transmitted by the third device to other signals is reduced, and at the same time, the communication quality of the third device can be guaranteed.

[0146] Exemplarily, the third device is an active tag, corresponding to Device C in 3GPP, the second device is a reader corresponding to the active tag, and the carrier wave is a CW wave. For the second type of tags that actively generate radio frequency signals, since the interference between the active tag and the reader is not mainly caused by the self-interference of the reader and the tag. Therefore, the traditional open-loop power control scheme (similar to NB-IoT) can be adopted. However, considering that the capabilities of active tags are poor and they may not support measuring reference signals. At the same time, considering that reducing the transmission power is very important for extending the service life of active tags, the power control of active tags should focus on energy conservation. Based on this, the following technical solution of the embodiment of the present application is proposed, and this solution is a semi-closed-loop power control method.

[0147] Before the active tag actually communicates with the reader, the active tag can read the transmission power in the third message carried in the CW wave to obtain the transmission power of the CW wave. Combining with the received power of the CW wave, the target path loss of the active tag can be obtained, and its calculation method is as follows:

[0148] Target path loss = CW wave transmission power - CW wave power received by the active tag;

[0149] It should be noted that although the active tag does not require the CW wave, it will also collect environmental energy. Therefore, the received power of the CW wave can be obtained according to the collected energy.

[0150] The reader can broadcast the target signal-to-noise ratio and target noise figure of the active tag using the third message. Combining with the calculated target path loss, the desired transmit power can be obtained, and the calculation method is as follows:

[0151] Desired transmit power = target signal-to-noise ratio × bandwidth × target noise figure + target path loss;

[0152] The active tag will use this power to communicate with the reader initially. If the reader does not respond to this power, the active tag can increase the transmit power actively. In some embodiments, the active tag increases the transmit power step by step according to the set step size until a response from the reader is obtained. The specific step size of the device can be set according to the actual situation, and this application does not make specific limitations on this.

[0153] The third message carries the first information, and the first information includes the transmit power of the CW wave by the active tag. The third message carries the fourth information, and the fourth information includes the target signal-to-noise ratio and the target noise figure. The active tag obtains the target path loss and the desired transmit power through the target signal-to-noise ratio, the target noise figure, and the transmit power. Alternatively, the third message carries the fifth information, and the fifth information includes multiple sets of corresponding signal-to-noise ratios, noise figures, and path losses. The target path loss of the active tag is determined according to the transmit power of the carrier obtained from the third message. Then, the path loss closest to the target path loss is selected from the multiple sets of corresponding relationships in the fifth information, and then the signal-to-noise ratio and noise figure corresponding to the path loss are used as the target signal-to-noise ratio and the target noise figure, and further the target transmit power of the active tag is obtained. The specific calculation methods of the target path loss and the target transmit power are as described above and will not be elaborated here.

[0154] Figure 5 It is a schematic diagram of the composition of the third message carrying the fifth information provided by the embodiment of this application, including a command block, two sets of signal-to-noise ratios, noise figures, and their corresponding path losses, which are: path loss 1 - target signal-to-noise ratio 1 - noise figure 1, path loss 2 - target signal-to-noise ratio 2 - noise figure 2, CW wave transmit power, and CW wave.

[0155] When the reader receives the message sent by the active tag, the reader starts to perform power back-off on the active tag, that is, reduces the transmit power to near the decoding threshold of the reader to reduce the energy consumption of the active tag. The reader can use the maximum bit error rate at the target communication rate as the threshold to gradually reduce or increase the transmit power of the tag.

[0156] In some embodiments, the method for controlling the transmission power of the active tag is to use the transmission power offset or the transmission power value sent in the fourth message. Since the fourth message is for a specific active tag, it is also necessary to include the identification information of the active tag. After receiving the fourth message that conforms to its identification information (such as identification codes like EPC, RN16, TID, etc.), the active tag needs to actively adjust its transmission power according to the instructions in the fourth message. The method for adjusting the transmission power is as described above and will not be elaborated here.

[0157] The technical solution of the embodiment of the present application proposes a power control method for an active tag. The active tag receives the third message sent by the reader-writer to determine the target signal-to-noise ratio and the target noise figure; thus, the expected transmission power of the active tag for the radio frequency signal can be determined according to the target signal-to-noise ratio and the target noise figure. The power control of the signal transmitted by the active tag is realized, the interference caused by the signal transmitted by the active tag to other signals is reduced, and at the same time, the communication quality of the active tag can be ensured.

[0158] Figure 6 is a schematic flow of the power control method provided by the embodiment of the present application Figure 3 , this method is applied to the second device; as Figure 6 shown, this method includes the following steps:

[0159] Step 601: Send a first message, where the first message is used to determine the transmission power of the second device for the carrier wave and the expected received power of the second device for the carrier wave.

[0160] Among them, the transmission power of the second device for the carrier wave, the expected received power of the second device for the carrier wave, and the received power of the first device for the carrier wave are used to determine the expected reflected power of the first device for the carrier wave.

[0161] In some embodiments, the second device corresponds to the first device, the first device is a backscatter tag, the second device is a reader-writer corresponding to the backscatter tag, and the carrier wave is a CW wave. The reader-writer sends the first message, which determines the transmission power of the reader-writer for the CW wave and the expected received power of the reader-writer for the CW wave. The expected reflected power of the backscatter tag for the CW wave is determined according to the transmission power of the reader-writer for the CW wave, the expected received power of the reader-writer for the CW wave, and the received power of the backscatter tag for the CW wave. The calculation method is as described above and will not be elaborated here.

[0162] The first message carries the first information and the second information. The first information includes the transmission power of the second device for the carrier wave, and the second information includes the expected received power of the second device for the carrier wave.

[0163] In some embodiments, there are two implementation manners for the power-related information in the present application: directly giving the value of the power or giving the level information of the power. There may also be other implementation manners, which are not specifically limited in the present application.

[0164] In some embodiments, the first information includes the transmission power of the carrier by the reader-writer. Then, the first device directly determines the transmission power of the carrier by the reader-writer according to the first information, or the first information includes the level of the transmission power of the carrier by the reader-writer, and the first device determines the transmission power of the carrier by the reader-writer according to this level. The second information includes the expected reception power of the carrier by the reader-writer. Then, the first device directly determines the expected reception power of the carrier by the reader-writer according to the second information, or the second information includes the level of the expected reception power of the carrier by the second device, and the first device determines the expected reception power of the carrier by the second device according to this level. In some embodiments, the first device is a backscatter tag and the carrier is a CW wave.

[0165] The first message carries the first information and the third information. The first information includes the transmission power of the carrier by the second device, and the third information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of corresponding reception power and path loss.

[0166] In some embodiments, the second device is a reader-writer, the first device is a backscatter tag, the carrier is a CW wave. The first message sent by the reader-writer carries the first information and the third information. The first information includes the transmission power of the CW wave by the reader-writer, and the third information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of corresponding reception power and path loss. The backscatter tag selects the reception power corresponding to the path loss closest to it from the multiple groups of information as the target reception power.

[0167] In some embodiments, sending the first message includes:

[0168] Sending the first message multiple times, where the reception power corresponding to different path losses in the third information carried in each sent first message is different; or,

[0169] Sending the first message through multiple beams, where different beams in the multiple beams correspond to different regional ranges.

[0170] In some embodiments, the second device is a reader-writer. By sending the first message, the reader-writer can control the reflection power of the tag according to the region, and implement the reader-writer to selectively inventory the tags in part of the region through the first message. The specific method is:

[0171] 1) When the reader senses that the number of collided tags or the overall number of tags is too large, the reader sends a first message to adjust the target received power corresponding to some path loss values to a lower value, where the lower value is lower than the noise power or 0.

[0172] 2) The reader inventory tags whose target received power is not the lower value. After the inventory is completed, the target received power corresponding to the path loss value of these tags is adjusted to the lower value.

[0173] 3) The reader adjusts the target received power of the tags that were not inventoried before and whose target received power was adjusted to a smaller value to the normal value, and repeats step 2) until all tags are inventoried. Among them, usually the normal value of the target received power needs to be greater than the minimum sensitivity of the tag, generally not less than -30 dBm.

[0174] Figure 7 is a schematic diagram of a method for inventorying tags provided by an embodiment of the present application. The reader sends a first message, and the first message includes three groups of information. Each group of information includes a pair of corresponding target received power and path loss. The target received power 1 is adjusted to -30 dBm, and the target received power 2 and target received power 3 are adjusted to -90 dBm, that is, the target received power 2 and 3 are lower values. The reader inventories the tags whose target received power is not the lower value, that is, inventories the tags corresponding to the target power 1, that is Figure 7 the shaded tags in part (a) of Figure 7 Then send the first message again, adjust the target received power 2 to -30 dBm, and adjust the target received power 1 and target received power 3 to -90 dBm, and inventory the tags corresponding to the target received power 2, that is Figure 7 the shaded tags in part (b) of

[0175] Send the first message again, adjust the target received power 3 to -30 dBm, and adjust the target received power 1 and target received power 2 to -90 dBm, and inventory the tags corresponding to the target received power 3, that is

[0176] In some embodiments, the reader sends the first message through multiple beams. Among them, different beams in the multiple beams correspond to different area ranges, and the tags are inventoried according to the area ranges corresponding to the multiple beams.

[0176] In some embodiments, a second message is sent. The second message carries the identification code of the first device and the reflection power threshold. The reflection power threshold includes the maximum reflection power and / or the minimum reflection power; among them, the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

[0177] The technical solution of the embodiment of the present application proposes a power control method for a second device, which sends a first message for determining the transmit power of the second device for a carrier wave and the desired receive power of the second device for the carrier wave. Among them, the transmit power of the second device for the carrier wave, the desired receive power of the second device for the carrier wave, and the receive power of the first device for the carrier wave are used to determine the desired reflection power of the first device for the carrier wave. In this way, the second device can use the first message to implement power control on the signal reflected by the first device, reduce the interference caused by the signal reflected by the first device to other signals, improve the communication distance and save the tag energy, ensure the communication quality of the first device. In addition, the inventory of the tag can also be realized through the first message, improving the inventory efficiency.

[0178] Figure 8 is a schematic flow of the power control method provided by the embodiment of the present application Figure 4 , this method is applied to the second device; as Figure 8 shown, this method includes the following steps:

[0179] Step 801: Send a third message for determining the target signal-to-noise ratio and the target noise figure.

[0180] Among them, the target signal-to-noise ratio and the target noise figure are used to determine the desired transmit power of the third device for the radio frequency signal.

[0181] In some embodiments, the second device corresponds to the third device, the third device is an active tag, the second device is a reader corresponding to the active tag, and the carrier wave is a CW wave. The reader sends a third message that determines the target signal-to-noise ratio and the target noise figure.

[0182] In some embodiments, the third message carries first information including the transmit power of the second device for the carrier wave. Among them, the transmit power of the second device for the carrier wave and the receive power of the third device for the carrier wave are used to determine the target path loss between the third device and the second device. The target signal-to-noise ratio, the target noise figure, and the target path loss are used to determine the desired transmit power of the third device for the radio frequency signal.

[0183] In some embodiments, the carrier wave is a CW wave, the second device is a reader, the third device is an active tag, the third message sent by the reader carries first information including the transmit power of the reader for the carrier wave, and the active tag determines the target path loss between the active tag and the reader according to the transmit power of the reader for the carrier wave and the receive power of the active tag for the carrier wave, and determines the desired transmit power of the active tag for the radio frequency signal according to the target path loss, the target signal-to-noise ratio, and the target noise figure. The calculation formulas of the target path loss and the desired transmit power are as described above and will not be elaborated here.

[0184] In some embodiments, the third message carries fourth information, and the fourth information includes a target signal-to-noise ratio and a target noise figure.

[0185] In some embodiments, the active tag obtains the target signal-to-noise ratio and the target noise figure according to the fourth information, determines the target path loss between the active tag and the reader based on the transmission power of the carrier by the reader and the reception power of the carrier by the active tag, and determines the expected transmission power of the active tag for the radio frequency signal according to the target path loss, the target signal-to-noise ratio, and the target noise figure. The calculation formulas for the target path loss and the expected transmission power are as described above and will not be elaborated here.

[0186] In some embodiments, the third message carries fifth information, and the fifth information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of corresponding signal-to-noise ratio, noise figure, and path loss.

[0187] In some embodiments, the second device is a reader, the first device is an active tag, the third message carries the fifth message, and the active tag selects the signal-to-noise ratio and the noise figure corresponding to the path loss closest to it from the multiple groups of information as its target signal-to-noise ratio and target noise figure according to the obtained target path loss.

[0188] In some embodiments, the multiple groups of information can also adapt to different communication rates, that is, the multiple groups of information are set according to different communication rates.

[0189] In some embodiments, a fourth message is sent, and the fourth message carries the identification code of the first device and a transmission power adjustment value; wherein, the transmission power adjustment value is used to adjust the expected transmission power of the radio frequency signal by the third device.

[0190] The technical solution of the embodiments of the present application proposes a power control method for a second device, sends a third message, and the third message is used to determine a target signal-to-noise ratio and a target noise figure; wherein, the target signal-to-noise ratio and the target noise figure are used to determine the expected transmission power of the radio frequency signal by the third device. In this way, the second device can use the third message to achieve power control of the signal transmitted by the third device, reduce the interference caused by the signal transmitted by the third device to other signals, improve the communication distance, save tag energy, and ensure the communication quality of the third device.

[0191] An embodiment of the present application proposes a power control method applicable to various devices in Passive Internet of Things (Ambient IoT). The network elements involved include a server (storing tag data and the corresponding relationship between tag data and readers, and interacting with readers), a reader (which can be a base station or a terminal, interacting with the server and tags), and a tag (having a single EPC identifier and storage capacity, interacting with readers). The power control method involves the reader and the tag itself. The power control of the present application mainly targets the control of the transmission or reflection power of the tag. On the one hand, a power control method for a first device is involved. The first device can be a backscatter tag. The reader realizes power control of the signal reflected by the backscatter tag by sending a first message or a second message, reducing the interference caused by the signal reflected by the backscatter tag to other signals, and at the same time ensuring the communication quality of the backscatter tag. On the other hand, a power control method for a third device is involved. The third device can be an active tag. The reader realizes spatial filtering control of the signal emitted by the active tag by sending a third message or a fourth message, reducing the interference caused by the signal emitted by the active tag to other signals, and at the same time ensuring the communication quality of the active tag. On the other hand, the reader realizes the inventory of tags in different regions by sending a first message, improving the inventory efficiency.

[0192] The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application. For example, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present application does not separately describe various possible combination methods. For another example, any combination can be made between various different embodiments of the present application as long as it does not violate the idea of the present application, and it should also be regarded as the content disclosed by the present application. For another example, on the premise of no conflict, each embodiment described in the present application and / or the technical features in each embodiment can be arbitrarily combined with the prior art, and the technical solutions obtained after combination should also fall within the protection scope of the present application.

[0193] It should be understood that in various method embodiments of the present application, the magnitude of the serial numbers of the above processes does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0194] Based on the same inventive concept as the foregoing embodiments, Figure 9 is a schematic structural composition of the power control device provided by the embodiment of the present application Figure 1, applied to the first device, such as Figure 9 As shown, the power control device 900 includes:

[0195] A receiving unit 901: configured to receive a first message sent by a second device, where the first message is used to determine the transmission power of the second device for a carrier wave and the desired received power of the second device for the carrier wave.

[0196] A determining unit 902, configured to determine the desired reflected power of the first device for the carrier wave according to the transmission power of the second device for the carrier wave, the desired received power of the second device for the carrier wave, and the received power of the first device for the carrier wave.

[0197] In some embodiments, the determining unit 902: is further configured to determine the target path loss between the first device and the second device according to the transmission power of the second device for the carrier wave and the received power of the first device for the carrier wave; and determine the desired reflected power of the first device for the carrier wave according to the target path loss and the desired received power of the second device for the carrier wave.

[0198] In some embodiments, the first message carries first information and second information, where the first information includes the transmission power of the second device for the carrier wave, and the second information includes the desired received power of the second device for the carrier wave.

[0199] In some embodiments, the determining unit 902: is further configured to determine the transmission power of the second device for the carrier wave according to the first information; and determine the desired received power of the second device for the carrier wave according to the second information.

[0200] In some embodiments, the first message carries first information and third information, where the first information includes the transmission power of the second device for the carrier wave, and the third information includes multiple groups of information, and each group of information in the multiple groups of information includes a pair of corresponding received power and path loss.

[0201] In some embodiments, the determining unit 902: is further configured to determine the transmission power of the second device for the carrier wave according to the first information; and determine, from the multiple groups of information, a path loss closest to the target path loss according to the third information and the target path loss between the first device and the second device, and use the received power corresponding to the closest path loss as the desired received power of the second device for the carrier wave.

[0202] In some embodiments, the determining unit 902: is further configured to determine the desired reflectivity of the first device for the carrier wave according to the desired reflected power of the first device for the carrier wave and the received power of the first device for the carrier wave.

[0203] In some embodiments, the power control device 900 further includes an adjustment unit 903.

[0204] In some embodiments, the adjustment unit 903 is configured to adjust the load capacitance and / or load resistance of the antenna of the first device according to the desired reflectivity of the first device for the carrier wave, and perform backscattering on the carrier wave through the adjusted antenna.

[0205] In some embodiments, the determination unit 902 is further configured to select an antenna from multiple antennas of the first device according to the desired reflectivity of the first device for the carrier wave, and perform backscattering on the carrier wave through the selected antenna, where different antennas among the multiple antennas correspond to different reflectivities.

[0206] In some embodiments, the receiving unit 901 is further configured to receive a second message sent by the second device, where the second message carries an identification code of the first device and a reflection power threshold, and the reflection power threshold includes a maximum reflection power and / or a minimum reflection power; where the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

[0207] Those skilled in the art should understand that Figure 9 the implementation functions of the units in the power control device shown can be understood with reference to the relevant descriptions of the foregoing method. Figure 9 The functions of the units in the power control device shown can be implemented by a program running on a processor, or can be implemented by specific logic circuits.

[0208] Figure 10 is a schematic structural composition of the power control device provided by an embodiment of the present application Figure 2 , applied to a third device, such as Figure 10 shown, the power control device 1000 includes:

[0209] The receiving unit 1001 is configured to receive a third message sent by the second device, and the third message is used to determine a target signal-to-noise ratio and a target noise figure.

[0210] The determination unit 1002 is configured to determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

[0211] In some embodiments, the third message carries first information, and the first information includes the transmission power of the second device for the carrier wave.

[0212] In some embodiments, the determination unit 1002 is further configured to determine a target path loss between the third device and the second device according to the transmission power of the second device for the carrier wave and the reception power of the third device for the carrier wave; determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio, the target noise figure, and the target path loss.

[0213] In some embodiments, the third message carries fourth information, and the fourth information includes a target signal-to-noise ratio and a target noise figure.

[0214] In some embodiments, the determining unit 1002: is further configured to determine a target signal-to-noise ratio and a target noise figure according to the fourth information.

[0215] In some embodiments, the third message carries fifth information, and the fifth information includes multiple groups of information. Each group of information in the multiple groups of information includes a pair of corresponding signal-to-noise ratio, noise figure, and path loss.

[0216] In some embodiments, the determining unit 1002: is further configured to determine, according to the fifth information and the target path loss between the third device and the second device, a path loss closest to the target path loss from the multiple groups of information, and use the signal-to-noise ratio and the noise figure corresponding to the closest path loss as the target signal-to-noise ratio and the target noise figure.

[0217] In some embodiments, the receiving unit 1001: is further configured to receive a fourth message sent by the second device, and the fourth message carries an identification code and a transmission power adjustment value of the first device.

[0218] In some embodiments, the power control device 1000 includes an adjustment unit 1003.

[0219] In some embodiments, the adjustment unit 1003 is configured to adjust the expected transmission power of the third device for the radio frequency signal according to the transmission power adjustment value.

[0220] Those skilled in the art should understand that Figure 10 the implementation functions of the units in the power control device shown can be understood with reference to the relevant descriptions of the foregoing method. Figure 10 The functions of the units in the power control device shown can be implemented by a program running on a processor or by specific logic circuits.

[0221] Figure 11 is a schematic structural composition of the power control device provided by an embodiment of the present application Figure 3 , applied to the second device, such as Figure 11 shown, the power control device 1100 includes:

[0222] A sending unit 1101, configured to send a first message, where the first message is used to determine the transmission power of the second device for the carrier wave and the expected receiving power of the second device for the carrier wave; wherein, the transmission power of the second device for the carrier wave, the expected receiving power of the second device for the carrier wave, and the receiving power of the first device for the carrier wave are used to determine the expected reflection power of the first device for the carrier wave.

[0223] In some embodiments, the first message carries first information and second information, where the first information includes the transmission power of the second device for the carrier, and the second information includes the desired received power of the second device for the carrier.

[0224] In some embodiments, the first message carries first information and third information, where the first information includes the transmission power of the second device for the carrier, and the third information includes multiple sets of information, and each set of information in the multiple sets of information includes a pair of corresponding received power and path loss.

[0225] In some embodiments, the sending unit 1101: is further configured to send the first message multiple times, where the received power corresponding to different path losses in the third information carried in each sent first message is different.

[0226] In some embodiments, the sending unit 1101: is further configured to send the first message through multiple beams, where different beams in the multiple beams correspond to different area ranges.

[0227] In some embodiments, the sending unit 1101: is further configured to send a second message, where the second message carries the identification code of the first device and a reflection power threshold, and the reflection power threshold includes a maximum reflection power and / or a minimum reflection power; where the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

[0228] Those skilled in the art should understand that Figure 11 The implementation functions of the units in the shown power control device can be understood with reference to the relevant descriptions of the foregoing method. Figure 11 The functions of the units in the shown power control device can be implemented by a program running on a processor or by specific logic circuits.

[0229] Figure 12 is a schematic structural composition of the power control device provided by an embodiment of the present application Figure 4 , applied to the second device, as Figure 12 shown, the power control device 1200 includes:

[0230] A sending unit 1201, configured to send a third message, where the third message is used to determine a target signal-to-noise ratio and a target noise figure; where the target signal-to-noise ratio and the target noise figure are used to determine the desired transmission power of the third device for the radio frequency signal.

[0231] In some embodiments, the third message carries first information, and the first information includes the transmission power of the second device for the carrier wave; wherein, the transmission power of the second device for the carrier wave and the reception power of the third device for the carrier wave are used to determine the target path loss between the third device and the second device; the target signal-to-noise ratio, the target noise figure, and the target path loss are used to determine the desired transmission power of the third device for the radio frequency signal.

[0232] In some embodiments, the third message carries fourth information, and the fourth information includes the target signal-to-noise ratio and the target noise figure.

[0233] In some embodiments, the third message carries fifth information, and the fifth information includes multiple groups of information, and each group of information in the multiple groups of information includes a corresponding pair of signal-to-noise ratio, noise figure, and path loss.

[0234] In some embodiments, the sending unit 1201: is further configured to send a fourth message, and the fourth message carries the identification code and the transmission power adjustment value of the first device; wherein, the transmission power adjustment value is used to adjust the desired transmission power of the third device for the radio frequency signal.

[0235] Those skilled in the art should understand that Figure 12 The implementation functions of the units in the power control device shown can be understood with reference to the relevant descriptions of the foregoing method. Figure 12 The functions of the units in the power control device shown can be implemented by a program running on a processor or by specific logic circuits.

[0236] Figure 13 is a schematic structural diagram of a communication device 1300 provided by an embodiment of the present application. Figure 13 The communication device 1300 shown includes a processor 1301, and the processor 1301 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0237] Optionally, as Figure 13 shown, the communication device 1300 may further include a memory 1302. Among them, the processor 1301 can call and run a computer program from the memory 1302 to implement the method in the embodiment of the present application.

[0238] Among them, the memory 1302 may be a separate device independent of the processor 1301 or may be integrated in the processor 1301.

[0239] Optionally, as Figure 13As shown, the communication device 1300 may further include a transceiver 1303. The processor 1301 may control the transceiver 1303 to communicate with other devices. Specifically, it may send information or data to other devices, or receive information or data sent by other devices.

[0240] Among them, the transceiver 1303 may include a transmitter and a receiver. The transceiver 1303 may further include an antenna, and the number of antennas may be one or more.

[0241] Optionally, the communication device 1300 may specifically be the first device in the embodiments of the present application, and the communication device 1300 may implement the corresponding processes implemented by the first device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0242] Optionally, the communication device 1300 may specifically be the second device in the embodiments of the present application, and the communication device 1300 may implement the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0243] Optionally, the communication device 1300 may specifically be the third device in the embodiments of the present application, and the communication device 1300 may implement the corresponding processes implemented by the third device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0244] Figure 14 is a schematic structural diagram of a chip according to an embodiment of the present application. Figure 14 The chip 1400 shown includes a processor 1401. The processor 1401 may call and run a computer program from a memory to implement the methods in the embodiments of the present application.

[0245] Optionally, as Figure 14 shown, the chip 1400 may further include a memory 1402. Among them, the processor 1401 may call and run a computer program from the memory 1402 to implement the methods in the embodiments of the present application.

[0246] Among them, the memory 1402 may be a separate device independent of the processor 1401, or may be integrated in the processor 1401.

[0247] Optionally, the chip 1400 may further include an input interface 1403. Among them, the processor 1401 may control the input interface 1403 to communicate with other devices or chips. Specifically, it may obtain information or data sent by other devices or chips.

[0248] Optionally, the chip 1400 may further include an output interface 1404. Among them, the processor 1401 may control the output interface 1404 to communicate with other devices or chips. Specifically, it may output information or data to other devices or chips.

[0249] Optionally, the chip may be applied to the first device in the embodiments of the present application, and the chip may implement the corresponding processes implemented by the first device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0250] Optionally, the chip may be applied to the second device in the embodiments of the present application, and the chip may implement the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0251] Optionally, the chip may be applied to the third device in the embodiments of the present application, and the chip may implement the corresponding processes implemented by the third device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0252] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip.

[0253] It should be understood that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiments may be completed by the integrated logic circuit in the hardware of the processor or by instructions in software form. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It may implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by the hardware decoding processor, or completed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0254] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not be limited to these and any other suitable types of memory.

[0255] It should be understood that the above memory is by way of example but not limitation. For example, the memory in the embodiments of the present application can also be a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate SDRAM (DDR SDRAM), an enhanced SDRAM (ESDRAM), a synch link DRAM (SLDRAM), and a direct rambus random access memory (DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not be limited to these and any other suitable types of memory.

[0256] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

[0257] Optionally, the computer-readable storage medium can be applied to the first device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the first device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0258] Optionally, the computer-readable storage medium can be applied to the second device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0259] Optionally, the computer-readable storage medium can be applied to the third device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the third device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0260] The embodiments of the present application also provide a computer program product including computer program instructions.

[0261] Optionally, the computer program product can be applied to the first device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the first device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0262] Optionally, the computer program product can be applied to the second device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0263] Optionally, the computer program product can be applied to the third device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the third device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0264] The embodiments of the present application also provide a computer program.

[0265] Optionally, the computer program can be applied to the first device in the embodiments of the present application. When the computer program runs on the computer, it causes the computer to execute the corresponding processes implemented by the first device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0266] Optionally, the computer program can be applied to the second device in the embodiments of the present application. When the computer program runs on a computer, it causes the computer to execute the corresponding processes implemented by the second device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0267] Optionally, the computer program can be applied to the third device in the embodiments of the present application. When the computer program runs on a computer, it causes the computer to execute the corresponding processes implemented by the third device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.

[0268] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0269] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

[0270] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in an electrical, mechanical, or other form.

[0271] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0272] In addition, the functional units in the various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0273] When the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0274] As described above, the above are only specific implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A power control method, characterized in that, Applied to a first device, the method includes: Receiving a first message sent by a second device, where the first message is used to determine the transmission power of the second device for a carrier wave and the desired received power of the second device for the carrier wave; Determining the desired reflected power of the first device for the carrier wave according to the transmission power of the second device for the carrier wave, the desired received power of the second device for the carrier wave, and the received power of the first device for the carrier wave.

2. The method according to claim 1, characterized in that, The determining the desired reflected power of the first device for the carrier wave according to the transmission power of the second device for the carrier wave, the desired received power of the second device for the carrier wave, and the received power of the first device for the carrier wave includes: Determining a target path loss between the first device and the second device according to the transmission power of the second device for the carrier wave and the received power of the first device for the carrier wave; Determining the desired reflected power of the first device for the carrier wave according to the target path loss and the desired received power of the second device for the carrier wave.

3. The method according to claim 1, characterized in that, The first message carries first information and second information, where the first information includes the transmission power of the second device for the carrier wave, and the second information includes the desired received power of the second device for the carrier wave; The method further includes: Determining the transmission power of the second device for the carrier wave according to the first information; Determining the desired received power of the second device for the carrier wave according to the second information.

4. The method according to claim 1, characterized in that, The first message carries first information and third information, where the first information includes the transmission power of the second device for the carrier wave, and the third information includes multiple sets of information, and each set of information in the multiple sets of information includes a pair of corresponding received power and path loss; The method further includes: Determining the transmission power of the second device for the carrier wave according to the first information; Determining, from the multiple sets of information, a path loss closest to the target path loss according to the third information and the target path loss between the first device and the second device, and using the received power corresponding to the closest path loss as the desired received power of the second device for the carrier wave.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: Determining the desired reflectivity of the first device for the carrier wave according to the desired reflected power of the first device for the carrier wave and the received power of the first device for the carrier wave.

6. The method according to claim 5, characterized in that, The method further includes: Adjusting the load capacitance and / or load resistance of the antenna of the first device according to the desired reflectivity of the first device for the carrier wave, and performing backscattering on the carrier wave through the adjusted antenna; or, Selecting an antenna from multiple antennas of the first device according to the desired reflectivity of the first device for the carrier wave, and performing backscattering on the carrier wave through the selected antenna, where different antennas among the multiple antennas correspond to different reflectivities.

7. The method according to any one of claims 1 to 4, characterized in that, The method further includes: Receive a second message sent by the second device, where the second message carries the identification code of the first device and a reflection power threshold, and the reflection power threshold includes a maximum reflection power and / or a minimum reflection power; wherein, the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

8. A power control method, characterized in that, Applied to a third device, the method includes: Receive a third message sent by the second device, where the third message is used to determine a target signal-to-noise ratio and a target noise figure. Determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

9. The method according to claim 8, characterized in that, The third message carries first information, and the first information includes the transmission power of the second device for the carrier wave. The determining the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure includes: Determine the target path loss between the third device and the second device according to the transmission power of the second device for the carrier wave and the reception power of the third device for the carrier wave. Determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio, the target noise figure, and the target path loss.

10. The method according to claim 8, characterized in that, The third message carries fourth information, and the fourth information includes the target signal-to-noise ratio and the target noise figure; the method further includes: Determine the target signal-to-noise ratio and the target noise figure according to the fourth information.

11. The method according to claim 8, wherein, The third message carries fifth information, and the fifth information includes multiple groups of information, and each group of information in the multiple groups of information includes a pair of corresponding signal-to-noise ratio, noise figure, and path loss. The method further includes: According to the fifth information and the target path loss between the third device and the second device, determine a path loss closest to the target path loss from the multiple groups of information, and use the signal-to-noise ratio and noise figure corresponding to the closest path loss as the target signal-to-noise ratio and the target noise figure.

12. The method according to any one of claims 8 to 11, wherein, The method further includes: Receive a fourth message sent by the second device, where the fourth message carries the identification code of the first device and a transmission power adjustment value. Adjust the desired transmission power of the third device for the radio frequency signal according to the transmission power adjustment value.

13. A power control method, wherein, Applied to the second device, the method includes: Send a first message, where the first message is used to determine the transmission power of the second device for the carrier wave and the desired reception power of the second device for the carrier wave. Wherein, the transmission power of the second device for the carrier wave, the desired reception power of the second device for the carrier wave, and the reception power of the first device for the carrier wave are used to determine the desired reflection power of the first device for the carrier wave.

14. The method according to claim 13, wherein, The first message carries first information and second information, the first information includes the transmission power of the second device for the carrier wave, and the second information includes the desired reception power of the second device for the carrier wave.

15. The method according to claim 13, wherein, The first message carries first information and third information. The first information includes the transmission power of the second device for the carrier, and the third information includes multiple groups of information, where each group of information in the multiple groups of information includes a pair of received power and path loss with a corresponding relationship.

16. The method according to claim 15, wherein, Sending the first message includes: Sending the first message multiple times, where the received power corresponding to different path losses in the third information carried in each sent first message is different; or, Sending the first message through multiple beams, where different beams in the multiple beams correspond to different regional ranges.

17. The method according to any one of claims 13 to 16, wherein, The method further includes: Sending a second message, where the second message carries the identification code of the first device and a reflection power threshold, and the reflection power threshold includes a maximum reflection power and / or a minimum reflection power; where the maximum reflection power is used to determine the maximum value of the desired reflection power, and the minimum reflection power is used to determine the minimum value of the desired reflection power.

18. A power control method, wherein, Applied to the second device, the method includes: Sending a third message, where the third message is used to determine a target signal-to-noise ratio and a target noise figure; where the target signal-to-noise ratio and the target noise figure are used to determine the desired transmission power of the third device for the radio frequency signal.

19. The method according to claim 18, wherein, The third message carries first information, and the first information includes the transmission power of the second device for the carrier; where the transmission power of the second device for the carrier and the received power of the third device for the carrier are used to determine the target path loss between the third device and the second device; the target signal-to-noise ratio, the target noise figure, and the target path loss are used to determine the desired transmission power of the third device for the radio frequency signal.

20. The method according to claim 18, wherein, The third message carries fourth information, and the fourth information includes the target signal-to-noise ratio and the target noise figure.

21. The method according to claim 18, wherein, The third message carries fifth information, and the fifth information includes multiple groups of information, where each group of information in the multiple groups of information includes a pair of signal-to-noise ratio, noise figure, and path loss with a corresponding relationship.

22. The method according to any one of claims 18 to 21, wherein, The method further includes: Sending a fourth message, where the fourth message carries the identification code of the first device and a transmission power adjustment value; where the transmission power adjustment value is used to adjust the desired transmission power of the third device for the radio frequency signal.

23. A power control device, wherein, Applied to the first device, the apparatus includes: A receiving unit, configured to receive a first message sent by a second device, where the first message is used to determine the transmission power of the second device for the carrier and the desired received power of the second device for the carrier; A determining unit, configured to determine the desired reflection power of the first device for the carrier according to the transmission power of the second device for the carrier, the desired received power of the second device for the carrier, and the received power of the first device for the carrier.

24. A power control device, characterized in that, Applied to the third device, the apparatus includes: A receiving unit, configured to receive a third message sent by a second device, where the third message is used to determine a target signal-to-noise ratio and a target noise figure; A determining unit, configured to determine the desired transmission power of the third device for the radio frequency signal according to the target signal-to-noise ratio and the target noise figure.

25. A power control device, characterized in that, Applied to a second device, the apparatus comprises: A sending unit, configured to send a first message, where the first message is used to determine the transmission power of the second device for a carrier wave and the expected received power of the second device for the carrier wave; Wherein, the transmission power of the second device for the carrier wave, the expected received power of the second device for the carrier wave, and the received power of a first device for the carrier wave are used to determine the expected reflected power of the first device for the carrier wave.

26. A power control device, characterized in that, Applied to a second device, the apparatus comprises: A sending unit, configured to send a third message, where the third message is used to determine a target signal-to-noise ratio and a target noise figure; Wherein, the target signal-to-noise ratio and the target noise figure are used to determine the expected transmission power of a third device for a radio frequency signal.

27. A communication device, characterized in that, Comprises: A processor and a memory, where the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 22.

28. A chip, characterized in that, Comprises: A processor, configured to call and run a computer program from a memory, such that a device installed with the chip executes the method according to any one of claims 1 to 22.

29. A computer-readable storage medium, characterized in that, For storing a computer program, where the computer program causes a computer to execute the method according to any one of claims 1 to 22.

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