CN115696542A

CN115696542A - Power control method and communication device

Info

Publication number: CN115696542A
Application number: CN202110877242.9A
Authority: CN
Inventors: 万晋京; 缪威; 李克鹏; 何波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-07-31
Filing date: 2021-07-31
Publication date: 2023-02-03
Also published as: WO2023010957A1

Abstract

The application provides a power control method and a communication device, and belongs to the technical field of communication. According to the method and the device, the power density of the terminal is not more than the threshold value by carrying out power control at the terminal level, so that the condition that EMF is met after the network equipment is deployed is ensured, and the difficulty of deploying the network equipment is reduced. Particularly, in the scene of terminal movement, because power statistics is carried out on the spatial grid passed by the terminal, the EMF of the terminal is ensured to be always safe in the moving process.

Description

Power control method and communication device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a power control method and a communications apparatus.

Background

Research has shown that non-ionizing radiation (NIR) in electromagnetic fields (EMF) can cause damage to living bodies, mainly due to thermal, non-thermal and cumulative effects affecting the nervous system, and even overheating of surface and local tissues. Currently, legislation is set out in countries around the world to constrain EMF. Therefore, how to guarantee EMF compliance is a problem that needs to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a power control method and a communication device, which are beneficial to the deployment of network equipment to conform to the regulation of EMF.

In a first aspect, an embodiment of the present application provides a power control method. The power control method can be applied to a network device or a chip in the network device. For example, the method may be performed by a baseband unit (BBU) or a chip in the BBU.

The method comprises the following steps: acquiring radiation power corresponding to at least one space grid through which a terminal passes; acquiring radiation power corresponding to the terminal according to the radiation power corresponding to the at least one space grid; and controlling the power density of the terminal to be smaller than or equal to a power density threshold value by controlling the radiation power of at least one beam transmitted to the terminal by the network equipment according to the radiation power corresponding to the terminal.

In the method, the power density of the terminal is not more than the threshold value by carrying out the power control at the terminal level, so that the network equipment is ensured to conform to the regulation of EMF after being deployed, and the difficulty of deploying the network equipment is reduced.

Particularly, in the scene of terminal movement, because power statistics is carried out on the spatial grid passed by the terminal, the EMF of the terminal is ensured to be always safe in the moving process. In addition, if the radiation power of a certain terminal exceeds the threshold, only the radiation power of the terminal is allowed to be reduced, and the radiation power of other terminals is not reduced, so that the terminals which do not exceed the threshold are prevented from being influenced.

A spatial grid may be understood as a concept of an angular domain, the spatial grid comprising one or more spatial directions. Alternatively, one spatial direction may be determined by a horizontal plane angle and a vertical plane angle. A horizontal angle of a spatial direction may be understood as an angle of the spatial direction in a horizontal plane, and a vertical angle of a spatial direction may be understood as an angle of the spatial direction in a vertical plane.

The spatial grid may comprise a plurality of spatial directions within an angular range comprising a horizontal plane angular range and a vertical plane angular range. It will be appreciated that a spatial grid may be defined by a horizontal plane angular range and a vertical plane angular range. The horizontal plane angle range of the spatial grid may be understood as an angle range of the spatial grid in the horizontal plane, and the vertical plane angle range of the spatial grid may be understood as an angle range of the spatial grid in the vertical plane. As an example, the horizontal plane angle range of the space grid is a horizontal plane minimum angle to a horizontal plane maximum angle, and the vertical plane angle range of the space grid is a vertical plane minimum angle to a vertical plane maximum angle.

Optionally, the radiation power corresponding to the at least one spatial grid is an average radiation power corresponding to the at least one spatial grid.

Since the EMF specification is usually determined according to the non-ionizing radiation generated after accumulating for a period of time, by counting the average radiation power for a period of time, it can be ensured that the deployment of the network device meets the EMF specification, and at the same time, the instantaneous transmission power at the moment of releasing part of the radiation power is allowed, thereby taking the performance of service processing into account.

Alternatively, the radiation power corresponding to the at least one spatial grid is an instantaneous radiation power corresponding to the at least one spatial grid.

Optionally, the radiation power corresponding to the terminal is obtained by accumulating the radiation power of the at least one spatial grid. For example, the radiation power corresponding to the terminal is obtained by accumulating the average radiation power of the at least one spatial grid. Or the radiation power corresponding to the terminal is obtained by accumulating the instantaneous radiation power of the at least one spatial grid.

The average may be implemented by, for example, arithmetic average, geometric average, square average, harmonic average, or weighted average.

In a scene that the terminal moves, the radiation power of different space grids passed by the terminal may be different, and the radiation power of the terminal can be more accurately counted by accumulating the radiation power of the space grids passed by the terminal.

Alternatively, the radiation power corresponding to the terminal is obtained by performing product, weighted sum, weighted product, accumulation or other calculation on the radiation power of the at least one spatial grid.

Optionally, the controlling, according to the radiation power corresponding to the terminal, the power density of the terminal to be less than or equal to a power density threshold by controlling the radiation power of at least one beam transmitted to the terminal by the network device includes: controlling the power density of the terminal to be less than or equal to a power density threshold value by controlling the radiation power of at least one wave beam transmitted to the terminal by the network equipment not to exceed the power threshold value; wherein the power threshold is obtained according to the power density threshold.

And obtaining a power threshold of the terminal according to the power density threshold, and controlling with the power threshold not exceeded as a target, so that the security of the EMF of the terminal is ensured.

Optionally, the power threshold and the power density threshold satisfy the following formula:

p represents the power threshold, S represents the power density threshold, R represents a safe distance corresponding to the at least one spatial grid, and G represents an antenna gain of the network device.

Optionally, the safety distance corresponding to the at least one spatial grid is a minimum safety distance among the safety distances of the at least one spatial grid.

The power threshold of the terminal is determined according to the minimum safe distance in the safe distances of the space grids passed by the terminal, so that the power threshold of the terminal obtains the minimum value in the power threshold of each space grid passed by the terminal, and the EMF of the terminal is ensured to be safe all the time in the moving process.

Alternatively, the safety distance corresponding to the at least one spatial grid is an average of the safety distances of the at least one spatial grid.

Optionally, the controlling the power density of the terminal to be less than or equal to a power density threshold by controlling the radiation power of at least one beam transmitted to the terminal by the network device not to exceed the power threshold includes: and performing power backoff on the radiation power of at least one beam transmitted to the terminal by the network device according to a power backoff amount under the condition that the radiation power corresponding to the terminal is greater than the power threshold, wherein the power backoff amount comprises a difference value between the radiation power corresponding to the terminal and the power threshold.

Optionally, the at least one spatial grid comprises a first spatial grid, the radiated power of the first spatial grid being determined from a power projection of each of at least one beam emitted by the network device over a historical period of time onto the first spatial grid.

Optionally, the radiation power of the first spatial grid is obtained by accumulating power projections of each beam in at least one beam emitted by the network device in a historical time period on the first spatial grid.

Optionally, the at least one beam is a beam of the plurality of beams of the terminal, where power of the beam meets a preset condition.

The beam satisfying the preset condition is, for example, a beam with the largest radiation power among the multiple beams that the network device radiates to the terminal, or is, for example, a beam with radiation power exceeding a power threshold.

In a second aspect, an embodiment of the present application provides a power control method, and on the basis of the method in the first aspect, the method further includes: the plurality of beams are transmitted.

The BBU of the network device or a chip in the BBU may perform the method of the first aspect, and a Radio Remote Unit (RRU) and an antenna in the network device may transmit the plurality of beams.

In a third aspect, an embodiment of the present application provides a communication apparatus, including a processor coupled to a memory, the memory being configured to store a computer program or instructions, and the processor being configured to execute the computer program or instructions in the memory, so that the communication apparatus performs the method of the first aspect. Optionally, the communication device further comprises the memory. Alternatively, the communication apparatus may be a network device or a chip in a network device, for example, a BBU or a chip in a BBU.

In a fourth aspect, an embodiment of the present application provides a processing apparatus, including: a processor and an interface for receiving and transmitting code instructions (from an external memory or other device) to the processor, the processor being configured to execute the code instructions to perform a method. Optionally, the processing apparatus may be a network device or a chip in a network device, for example, a BBU or a chip in a BBU.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, where on the basis of the communication apparatus in the third aspect, the communication apparatus further includes an antenna, and the antenna is configured to transmit the multiple beams. Optionally, the communication apparatus may further include an RRU.

In a sixth aspect, the present application provides a communication apparatus, which includes one or more modules for implementing the method of the first aspect or the second aspect, where the one or more modules may correspond to the steps of the method of the first aspect or the second aspect.

In a seventh aspect, an embodiment of the present application provides a computer storage medium, where the storage medium is used to store a computer program or instructions, and when the program runs in a computer, the computer is caused to execute the method of the first aspect or the second aspect.

In an eighth aspect, an embodiment of the present application provides a computer program product, which includes a program that, when executed, causes the method of the first aspect or the second aspect to be performed.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart of a power control method provided in an embodiment of the present application;

fig. 3 is a schematic diagram of multiple beams transmitted by a network device according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a power projection of a beam onto a spatial grid according to an embodiment of the present application;

fig. 5 is a flowchart of a power control method provided in an embodiment of the present application;

fig. 6 is a flowchart of a power control method provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of partitioning a spatial grid according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a horizontal safety distance and a vertical safety distance provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of a safe distance provided by an embodiment of the present application;

FIG. 10 is a schematic diagram illustrating a power control using an EMF power lock mechanism according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Research has shown that NIR in EMF can be harmful to living organisms, mainly in that thermal, non-thermal and cumulative effects can affect the nervous system and even cause overheating of surface and local tissues. Currently, various countries in the world have laws and regulations for restricting EMF, and reference is mainly made to the International Commission on Non-Ionizing Radiation Protection (ICNIRP) which issues to limit the intensity of EMF using different physical quantities for different frequencies. The EMF-specified standards for various countries and organizations are shown in table 1 below.

TABLE 1

As shown in Table 1, most countries in the European Union refer to the ICNIRP guidelines and the power density is f/200W/m for frequencies (f) in the range of 0.4G-2G ² When the frequency range is more than 2G, the power density is 10W/m ² (ii) a Some countries of the European Union have special requirements, for example a power density of 0.042W/m in Switzerland ² Italy and Poland have a power density of 0.095W/m ² The power density of Belgium and Lusenberg is 0.0238W/m ² (ii) a China has special requirements, uses the GB8702B standard, and has the power density of 0.4W/m when the frequency range is 0.03G-3G ² The frequency range is 3G-15G, and the power density is f/7500W/m ² The frequency range is 15G-30G, and the power density is 2W/m ² . Other regions/countries can refer to the related contents in table 1, and the details are not repeated herein.

Currently, the EMF calculation mostly adopts a time averaging method, that is, the sum of the power densities of all frequency bands of a position point in a period of time is counted, and a specific statistical method is shown in table 2 below.

TABLE 2

The power density of each frequency band of the site needs to meet the following requirements:

wherein i denotes the number of the frequency band, S _Li Indicates the ICNIRP specified Power Density, S _i Representing the power density, S, in the frequency band i of the measurement point _i The calculation method of (2) is shown in the following formula (1).

In the formula (1), P _i Indicating the power level, G, of the frequency band i of the measurement point _i Representing the antenna gain for the frequency band. R represents the distance from the sky to the measurement point in meters (m).

At present, the rated power of a large-scale multiple-input multiple-output (massive MIMO, MM) module is large, the antenna gain is very high (up to 24 dBi), and the following risks exist when the network is deployed according to the above standards: (1) newly-made deployment is difficult: the current 5G modules are MM high-power modules, EMF regulations cannot be met if the modules are transmitted at full power, and coverage is affected if power is reduced. (2) new carrier deployment is difficult: the 2G/3G/4G radiation level of the existing network is close to the upper limit of the EMF standard, and the EMF exceeds the standard due to the newly added carrier.

In some embodiments of the present application, terminal-level power monitoring and power control are performed, so that on the premise that performance is not affected as much as possible, EMF compliance in a safe distance range is ensured, and the deployment difficulty of a 5G high-power module is reduced.

The following illustrates a system architecture provided in the embodiments of the present application.

The embodiment of the application provides a communication system, which comprises network equipment and at least one terminal, wherein the at least one terminal can carry out wireless communication with the network equipment. Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application. In fig. 1, the network device 11 and the terminal 12 can perform wireless communication, and the network device 11 and the terminal 13 can perform wireless communication. It should be noted that the network devices and the terminals included in the communication system as shown in fig. 1 are only an example, and in the embodiment of the present application, the types and the numbers of the network elements included in the communication system, and the connection relationship between the network elements are not limited thereto.

The communication system in the embodiment of the present application may be a communication system supporting a fourth generation (4G) access technology, such as an LTE access technology; alternatively, the communication system may be a communication system supporting a fifth generation (5G) access technology, such as an NR access technology; alternatively, the communication system may be a communication system supporting a third generation (3G) access technology, such as a Universal Mobile Telecommunications System (UMTS) access technology; alternatively, the communication system may also be a communication system supporting a plurality of wireless technologies, for example, a communication system supporting an LTE technology and an NR technology. In addition, the communication system may also be adapted for future-oriented communication technologies.

The network device 11 includes, but is not limited to, a device on an access network side for supporting a terminal to access a communication system, and may be, for example, a Base Transceiver Station (BTS) and a Base Station Controller (BSC) in a 2G access technology communication system, a node B (node B) and a Radio Network Controller (RNC) in a 3G access technology communication system, an evolved node B (eNB) in a 4G access technology communication system, a next generation base station (neighbor node B) in a 5G access technology communication system, a Transmission Reception Point (TRP), a relay node (relay node), an Access Point (AP), and the like.

The terminal 12 may be a device that provides voice or data connectivity to a user, and may also be referred to as User Equipment (UE), mobile station (mobile station), subscriber unit (subscriber unit), station (station), terminal Equipment (TE), etc. The terminal 12 may be a cellular telephone (cellular phone), a Personal Digital Assistant (PDA), a wireless modem (modem), a handheld device (hand held), a laptop computer (laptop computer), a cordless telephone (cordless phone), a Wireless Local Loop (WLL) station, a tablet (pad), etc. With the development of wireless communication technology, the device that can access the communication system, can communicate with the network side of the communication system, or can communicate with other objects through the communication system may be a terminal in the embodiments of the present application, such as a terminal in intelligent transportation and an automobile, a home appliance in an intelligent home, a power meter reading instrument in an intelligent power grid, a voltage detection instrument, an environment detection instrument, a video monitoring instrument in an intelligent security network, a cash register, and so on. The terminal 13 is the same as the terminal 12.

The following illustrates the method flow of the embodiments of the present application.

Fig. 2 is a flowchart of a power control method according to an embodiment of the present application. The method shown in fig. 2 includes the following steps S201 to S203.

The network deployment scenario upon which the method of fig. 2 is based is optionally as described above with respect to fig. 1. For example, referring to fig. 1, the network device in the method shown in fig. 2 is the network device 11 in fig. 1, and the terminal in the method shown in fig. 2 is the terminal 12 or the terminal 13 in fig. 1.

The method shown in fig. 2 illustrates a case where all the steps are performed by the network device. Optionally, the method shown in fig. 2 is specifically executed by a baseband unit (BBU) included in the network device or a chip in the BBU. In other embodiments, the method shown in fig. 2 is performed interactively by the network device and the network management device (or other control plane network element/management plane network element). For example, the network management device executes step S201 and step S202, the network management device sends the radiation power corresponding to the terminal to the network device, and the network device executes step S203 according to the received radiation power corresponding to the terminal.

The method shown in fig. 2 is applied to a scenario in which a network device performs wireless communication with a terminal. Optionally, the embodiment of the application is applied to a scenario in which the network device and the terminal perform wireless communication through an MIMO technology.

The method shown in fig. 2 is optionally used for scenes where the terminal is moving in multiple spatial grids. For the convenience of the reader, the processing manner for the first spatial grid will be explained in many places in the method shown in fig. 2. The first spatial grid refers to a certain spatial grid through which the terminal passes, and reference may be made to the description of the first spatial grid for processing manners of other spatial grids except the first spatial grid.

Step S201, the network device obtains radiation power corresponding to at least one spatial grid through which the terminal passes.

A spatial grid may be understood as a concept of an angular domain, the spatial grid comprising one or more spatial directions. One spatial direction is optionally determined by the angle relative to the horizontal and the angle relative to the vertical. A spatial grid is optionally defined by a horizontal angular range and a vertical angular range. The horizontal angular range refers to the angular range of the spatial grid with respect to the horizontal plane, and the vertical angular range may be understood as the angular range of the spatial grid with respect to the vertical plane. Optionally, the angular range for one spatial grid is continuous.

The radiation power corresponding to the spatial grid refers to a total power obtained by mapping the radiation power of at least one beam to the spatial grid when the network device transmits the at least one beam to the space in a historical time period. Mapping the radiation power of a beam to a spatial grid refers to projecting the radiation power of the beam from the direction of the beam into the direction of the spatial grid. Specifically, a beam emitted by the network device generally forms an angle with the spatial grid, so that the radiation power of the spatial grid is generally smaller than that of the beam, and the radiation power of the spatial grid is counted according to the projected power by projecting the radiation power of the beam to the direction of the spatial grid, so as to perform power statistics more accurately. In some embodiments of the present application, the terms "power resulting from mapping the radiated power of a beam onto a spatial grid" and "power projection of a beam onto a spatial grid" are used interchangeably.

Optionally, the radiation power corresponding to the spatial grid is a total power obtained by mapping the radiation power of all beams transmitted by the network device to the spatial grid. Alternatively, the radiation power corresponding to the spatial grid is the total power obtained by mapping the radiation power of the partial beams directed to the terminal among all the beams transmitted by the network device to the spatial grid.

Optionally, the radiation power corresponding to the spatial grid is determined from a power projection of each of the plurality of beams on the spatial grid. Taking the first spatial grid as an example, when the network device acquires the radiation power corresponding to the first spatial grid, the network device acquires a power projection of each beam in the first spatial grid in at least one beam emitted by the network device in a historical time period, and determines the radiation power corresponding to the first spatial grid according to the power projection of each beam in the first spatial grid.

Optionally, the radiation power of the first spatial grid is accumulated by power projection of each beam in the first spatial grid in at least one beam emitted by the network device in a historical time period. In other words, the radiation power of the first spatial grid is the sum of the power projections of each beam on the first spatial grid. Optionally, the accumulation is replaced by a product, a weighted sum, a weighted product, an accumulation or other calculation method, so as to determine the radiation power corresponding to the first spatial grid.

In some embodiments, the direction of the beam is represented by the weight of the beam and the angle between the beam and the spatial grid is represented by the vector angle between the weight of the beam and the direction vector of the spatial grid. For example, referring to fig. 3 and 4, fig. 3 shows the direction of beam 1, the direction of beam M, and the direction of the spatial grid transmitted by the network device, and fig. 4 shows the power projection of beam 1 and beam M on the spatial grid. W _dm Is the weight of the beam m, W _dm Is a one-dimensional vector, W _d1 Is the weight of beam 1, W _d1 Is a one-dimensional vector, W _n Is the direction vector of grid n, W ₁ Represents the weight W _d1 Power value after projection, W _m Represents the weight W _dm Power value after projection, theta ₁ Represents the weight W _d1 Angle relative to grid direction, θ _m Represents the weight W _dm Angle relative to the grid direction. The power of beam 1 and beam M mapped on the spatial grid is for example W ₁ And W _m The sum of (a) and (b).

In case the spatial grid comprises a plurality of spatial directions, optionally the network device projects the radiation power of the beam into a first spatial direction comprised by the spatial grid to obtain a corresponding radiation power of the spatial grid. The first spatial direction refers to one of the spatial directions comprised by the spatial grid. For example, the first spatial direction refers to a spatial direction in which the power projection is largest among all spatial directions of the spatial grid. For another example, the first spatial direction is a direction in which a horizontal plane angle is the smallest and a vertical plane angle is the smallest, or a direction in which a horizontal plane angle is the largest and a vertical plane angle is the largest, among all spatial directions of the spatial grid. As another example, the first spatial direction refers to a spatial direction in which an average value of horizontal plane angles and an average value of vertical plane angles are located in an angular domain of the spatial grid. Alternatively, the network device projects the radiation power of the beam to each of a plurality of spatial directions included in the spatial grid, and then averages the plurality of obtained power projections to obtain the radiation power corresponding to the spatial grid.

The correspondence between the spatial grid and the radiation power includes, but is not limited to, a one-to-one relationship or a many-to-one relationship, as exemplified by case a and case B below.

Case A, one spatial grid corresponding to one radiation power

Specifically, the network device obtains the radiation power corresponding to each of at least one spatial grid through which the terminal passes. For example, the terminal passes through n spatial grids, and for each spatial grid of the n spatial grids passed by the terminal, the network device calculates the radiation power corresponding to the spatial grid in a power projection manner, so as to obtain n parts of radiation power. Wherein n is a positive integer. By respectively counting the power of each grid passed by the terminal, the accuracy of the counting result is improved.

Case B, multiple spatial grids corresponding to a radiation power

For example, the terminal passes through n spatial grids, the network device selects m spatial grids from the n spatial grids passed by the terminal, and the network device obtains the radiation power corresponding to each spatial grid of the selected m spatial grids. In case B, there are multiple implementations of the selection of the spatial grid. For example, the network device selects m spatial grids of the n spatial grids in which the radiation power is higher than a set threshold, or the network device selects a spatial grid in which the radiation power is ranked m bits earlier. For another example, a spatial grid with the maximum radiation power is selected from every adjacent k spatial grids in the n spatial grids passed by the terminal, and the radiation power corresponding to the spatial grid with the maximum radiation power is taken as the radiation power corresponding to the k spatial grids. Wherein n, m and k are positive integers, n is greater than or equal to m, and m is greater than or equal to k. Through counting a corresponding power for a plurality of grids passed by the terminal, the calculation amount is reduced, and the counting efficiency is improved.

Optionally, the network device obtains the radiation power corresponding to the spatial grid, specifically obtains an average radiation power corresponding to the spatial grid over a period of time. There are various implementation manners how to obtain the average radiation power, and the following illustrates a manner of obtaining the average radiation power by taking a process of obtaining the average radiation power corresponding to the first spatial grid in the first time period as an example. In a possible implementation, the network device obtains the radiation power corresponding to the first spatial grid of each TTI in the first time period, and averages the radiation power corresponding to the first spatial grid of each TTI to obtain the average radiation power corresponding to the first spatial grid. In another possible implementation, the network device selects multiple time sampling points in a first time period, obtains an instantaneous radiation power corresponding to the first spatial grid of each time sampling point, accumulates the instantaneous radiation power corresponding to the first spatial grid of each time sampling point, and divides the accumulated instantaneous radiation power by the time length of the first time period to obtain an average radiation power corresponding to the first spatial grid.

Alternatively, the network device obtains the radiation power corresponding to the spatial grid, specifically obtains the maximum instantaneous power in a plurality of instantaneous powers of the spatial grid over a period of time. For example, when the network device obtains the radiation power corresponding to the first spatial grid in the first time period, the network device obtains the instantaneous radiation power corresponding to the first spatial grid at each time sampling point in the first time period, and selects the maximum instantaneous radiation power from the instantaneous radiation powers corresponding to the first spatial grid at each time sampling point as the radiation power corresponding to the first spatial grid.

Step S202, the network equipment obtains the radiation power corresponding to the terminal according to the radiation power corresponding to at least one space grid.

Alternatively, in case of a terminal movement, the terminal moves from one spatial grid to another spatial grid, thereby passing through a plurality of spatial grids. The network equipment accumulates the radiation power of each space grid in a plurality of space grids passed by the terminal to obtain the radiation power corresponding to the terminal. Optionally, the accumulated radiation power of each spatial grid is an average radiation power. For example, when the network device counts the radiation power of the first time period, the network device accumulates the average radiation power of each spatial grid that the terminal passes through in the first time period, and obtains the radiation power corresponding to the terminal in the first time period.

Optionally, in a case that the terminal is in the same spatial grid within a period of time, the radiation power corresponding to the terminal is the radiation power corresponding to the spatial grid in which the terminal is located.

Step S203, the network device controls the power density of the terminal to be less than or equal to the power density threshold by controlling the radiation power of at least one beam transmitted to the terminal by the network device according to the radiation power corresponding to the terminal.

The beam transmitted by the network device to a terminal is optionally one beam or a set of multiple beams. The network device specifically controls which beams transmitted to the terminal have their radiated power in a number of ways. Optionally, the beam controlled by the network device is a beam of which the power satisfies a preset condition among a plurality of beams of the terminal. The beam satisfying the preset condition is, for example, a beam with the largest radiation power from the network device to the terminal, and is, for example, a beam with the radiation power exceeding a power threshold. Optionally, the network device controls the radiated power of the data channel beam transmitted to the terminal while keeping the radiated power of the control channel beam transmitted to the terminal unchanged. By reducing the power of the data channel beam, the power of the control channel beam is not reduced, which is helpful for ensuring the access performance of the terminal. Alternatively, the network device controls the radiation power of all beams transmitted to the terminal.

The manner in which the network device transmits the beam is implemented based on Beamforming (BF) technology, for example. Specifically, the network device weights the radio frequency signals generated by the antenna unit according to the weight values, so that the radio frequency signals are focused into beams and are transmitted to the terminal. The basic principle of the beam forming technology is to weight the radio frequency signals of each antenna unit in the antenna array, so as to adjust the direction of the beam and realize the alignment of the terminal transmitting signals. Beamforming includes, but is not limited to, digital beamforming, analog beamforming, and hybrid beamforming. Wherein, weighting refers to that the network device multiplies the weight value by the radio frequency signal by a vector.

Schematically, referring to fig. 1, the network device 11 transmits a beam 1 and a beam 2, where the direction of the beam 1 is the direction in which the terminal 13 is located, and the direction of the beam 2 is the direction in which the terminal 12 is located. After the network device obtains the radiation power corresponding to the terminal 12 and the radiation power corresponding to the terminal 13, the radiation power of the beam 2 is controlled according to the radiation power corresponding to the terminal 12, the radiation power of the beam 1 is controlled according to the radiation power corresponding to the terminal 13, and the power densities of the terminal 12 and the terminal 13 are smaller than or equal to a power density threshold.

The power density threshold value represents the highest power density at which the electromagnetic field strength meets specified conditions. The power density threshold is determined, for example, according to the requirements of an entity such as a country/organization/operator/regulatory body.

In some embodiments, the network device obtains a power threshold corresponding to the terminal, and the network device controls the power density of the terminal to be less than or equal to the power density threshold by controlling the radiation power of at least one beam transmitted to the terminal by the network device not to exceed the power threshold.

The power threshold refers to the highest value of the radiated power allowed to be emitted. In some embodiments, the power threshold is derived from a power density threshold. For example, the network device obtains the power threshold according to the power threshold, the power density threshold, the safety distance corresponding to at least one spatial grid passed by the terminal, and the antenna gain of the network device.

Safe distance refers to the distance between the object and the network device that meets EMF requirements. For example, in the case of a safe distance of X meters, the EMF intensity measured at or above X meters from the network device needs to meet the EMF requirements to ensure compliance in network device deployment.

Optionally, the network device calculates the power threshold based on equation (2) below.

P represents a power threshold, S represents a power density threshold, R represents a safe distance corresponding to at least one spatial grid, and G represents an antenna gain of the network device.

Alternatively, the power threshold is set by the operator or the user.

Optionally, the safe distance (i.e., R) used in obtaining the power threshold is the minimum safe distance. For example, the network device obtains the safe distance of each of all the spatial grids passed by the terminal, and obtains the power threshold value based on formula (2) according to the minimum safe distance among the safe distances of all the spatial grids passed by the terminal. For another example, the network device obtains the safety distance of each spatial grid within the coverage area, and obtains the power threshold based on formula (2) according to the minimum safety distance among the safety distances of each spatial grid within the coverage area.

In some embodiments, the network device controls the radiated power not to exceed the power threshold, in particular by means of power detection and power backoff. Specifically, after the network device obtains the radiation power corresponding to the terminal in the historical time period, the network device judges whether the radiation power corresponding to the terminal in the historical time period is greater than a power threshold value; under the condition that the radiation power corresponding to the terminal is larger than the power threshold, the network equipment acquires the power back-off quantity, and performs power back-off on the radiation power of at least one wave beam emitted to the terminal by the network equipment according to the power back-off quantity so as to reduce the radiation power of the wave beam, and therefore the radiation power corresponding to the terminal in a future time period can not exceed the power threshold. Optionally, the network device determines, according to a service requirement, the radiation power of at least one beam transmitted to the terminal when the radiation power corresponding to the terminal is less than or equal to the power threshold, for example, the radiation power of the beam is kept unchanged, or the radiation power of the beam is appropriately increased.

The power back-off refers to reducing the radiation power of a beam, and the power back-off includes a difference value between the radiation power corresponding to the terminal and a power threshold. For example, the power back-off is equal to the difference between the corresponding radiation power of the terminal and the power threshold.

The method provided by the embodiment realizes that the power density of the terminal does not exceed the threshold value by performing the power control at the terminal level, thereby ensuring that the deployed network equipment conforms to the EMF regulation and reducing the difficulty of deploying the network equipment. In addition, in the scene of terminal movement, because power statistics is carried out on the spatial grid passed by the terminal, the EMF of the terminal is ensured to be always safe in the moving process. In addition, if the radiation power of a certain terminal exceeds the threshold, only the radiation power of the terminal is allowed to be reduced, and the radiation power of other terminals is not reduced, so that the influence on the terminals which do not exceed the threshold is avoided.

The above-described embodiment shown in fig. 2 shows a terminal-level power control manner, and optionally, the terminal-level power control manner is combined with a spatial grid-level power control manner, so as to ensure that both the power density of the spatial grid and the power density of the terminal meet the requirements, which is specifically referred to the following embodiment shown in fig. 5.

Fig. 5 is a flowchart of a power control method according to an embodiment of the present application. The method shown in fig. 5 includes the following steps S201' to S204. Reference is made to the description of the method of fig. 2 for steps S202 and S203 in the method of fig. 5.

Step S201', the network device obtains radiation power corresponding to a plurality of spatial grids in the coverage area of the sky.

The network device's skyward coverage includes a plurality of spatial grids including at least one spatial grid that the terminal passes through and at least one spatial grid that the terminal does not pass through. Optionally, the network device obtains the radiation power corresponding to each spatial grid covered. For example, the network device projects the power of all the transmitted beams to each spatial grid respectively according to the direction of each transmitted beam and the direction of each spatial grid, so as to obtain the radiation power corresponding to each spatial grid.

Step S202, the network equipment obtains the radiation power corresponding to the terminal according to the radiation power corresponding to at least one space grid through which the terminal passes.

Step S203, the network equipment controls the power density of the terminal to be smaller than or equal to the power density threshold value by controlling the radiation power of at least one wave beam emitted to the terminal by the network equipment according to the radiation power corresponding to the terminal.

Step S204, the network device controls the power density of the space grid to be smaller than or equal to the power density threshold value by controlling the radiation power of the beam which is emitted by the network device and passes through the space grid according to the radiation power corresponding to each space grid.

Taking controlling the radiation power of the first spatial grid as an example, the network device obtains a power threshold corresponding to the first spatial grid, and controls the power density of the first spatial grid to be less than or equal to the power density threshold by controlling the radiation power of the beam passing through the first spatial grid not to exceed the power threshold corresponding to the first spatial grid. Wherein, the power threshold corresponding to the first spatial grid is also referred to as the maximum power available for the first spatial grid.

The power threshold corresponding to the first spatial grid is determined in the same manner as the power threshold corresponding to the terminal. For example, the power threshold corresponding to the first spatial grid is obtained according to the power density threshold. Illustratively, the power threshold and the power density threshold corresponding to the first spatial grid satisfy the above equation (2), where R is the safety distance corresponding to the first spatial grid.

The timing sequence of step S204 and step S203 is not limited in this embodiment. Optionally, step S204 is executed first, and then step S203 is executed; or, step S203 is executed first, and then step S204 is executed; alternatively, step S203 and step S204 are executed in parallel.

The method provided by this embodiment controls the radiation power corresponding to the terminal and controls the radiation power corresponding to the space grid, so as to ensure that the EMF of each object (whether a mobile terminal or a static building) within the coverage area of the network device is kept safe.

The method shown in FIG. 5 above is illustrated below with reference to an example.

Example 1

The base station in example 1 is a network device in the method shown in fig. 5. As shown in fig. 6, example 1 includes step S301 to step S307.

Step S301, the base station divides the sky coverage into N space grids.

The division of the spatial grid includes various ways. Optionally, the base station divides the spatial grid in a uniform manner. For example, the base station determines the length of the horizontal angle range of the spatial grid and the length of the vertical angle range of the spatial grid, divides the spatial grid according to the length of the horizontal angle range and the length of the vertical angle range, and divides the spatial grid into the spatial grid having the same length of the horizontal angle range and the vertical angle range.

For example, each 8 degrees horizontally and 3 degrees vertically in space is divided into a grid. Referring to fig. 7, fig. 7 is a schematic diagram illustrating a partitioned spatial grid. Fig. 7 shows the division of the spatial directions comprised by the horizontal angle range (-80 deg., 80 deg.) and the vertical angle range (-14 deg., 31 deg.) into 288 spatial grids.

Alternatively, the base station divides the space grids in a non-uniform manner, and the lengths of the horizontal plane angle ranges or the vertical plane angle ranges of the divided space grids are different.

Step S302, the base station determines the safety distance of each space grid according to the supervision requirement or the actual situation of the user.

The safety distance includes a safety distance in a horizontal direction and a safety distance in a vertical direction. The safety distance in the horizontal direction is, for example, a projection of the safety distance in the horizontal plane. The safety distance in the vertical direction is, for example, a projection of the safety distance R on a vertical plane. The safety distance in the horizontal direction and the safety distance in the vertical direction are optionally different or the same.

Fig. 8 is a schematic diagram of a horizontal safe distance and a vertical safe distance, and fig. 8 shows a cylinder with a radius a and a height C + B, where C is the height of the antenna, by using the bottom end of the antenna as the origin of the coordinate system, as shown in fig. 8, and assuming that there is no need to control the EMF intensity above the antenna.

Optionally, the distance between the surface of the cylinder on the spatial grid and the bottom end of the antenna is a safe distance of the spatial grid. For example, a spatial grid X _n In a horizontal plane within an angle range of

To is that

Space grid X _n Has a vertical plane angle range of

To

Space grid X _n A safety distance of R _n Can be at an angle of the horizontal plane of

And the angle of the vertical plane is

The distance of the vehicle to the ground is set,

is composed of

To is that

One value of (a) to (b),

is composed of

To is that

One value of (1). As shown in FIG. 8, the safety distance R _n Is composed of

The distance between the intersection point with the cylinder and the bottom end of the antenna.

Alternatively, when there are multiple spatial grids, the distance between the surface of the cylinder on each spatial grid and the bottom end of the antenna can be determined separately.

Alternatively, the step of dividing the spatial grids and the step of determining the safety distance are performed by a network management device, and the network management device sends the angle range of each spatial grid and the safety distance of each spatial grid to the base station.

Step S303, the base station determines a power threshold (i.e. maximum transmit power) for each spatial grid.

Specifically, the base station calculates the power threshold of each spatial grid according to the above formula (2) according to the safe distance of each spatial grid.

Step S304, the base station determines the power threshold of each terminal.

Specifically, the base station selects the minimum safe distance from the safe distances of each spatial grid covered, and the base station calculates the power threshold of each terminal according to the minimum safe distance and formula (2). Or, for any terminal, the base station selects the minimum safe distance from the safe distances of each spatial grid passed by the terminal, and the base station calculates the power threshold of the terminal according to the minimum safe distance and the formula (2).

Taking an Active Antenna Unit (AAU) module deployed in a certain base station in china as an example, fig. 9 shows a network deployment scenario and a security distance of the AAU module. As shown in fig. 9, the power safety point is 5m away from the building horizontal, the station height is 20m, and the safety distance R is 20.6m. Table 3 below shows the maximum power density (power density threshold) and the antenna gain of the AAU module. Assuming that the safety distance of each grid is the same, the minimum safety distance is 20.6m. And substituting S into 0.4, G into 17, R into 20.6m, and substituting into formula (2) to obtain the maximum transmission power (power threshold of terminal) of 125.4W.

TABLE 3

Step S305, the base station counts the average power of each grid and the average power of each terminal over time. The statistical method comprises the following steps (1) and (2).

(1) Grid average power statistics

According to the scheduling result of the base station, the weight value scheduled on each RBG in each Transmission Time Interval (TTI) can be obtained, the power mapping from each weight value to each space direction is calculated, the power mapping of all the weight values on any grid in the grid is accumulated, and the average transmission power on each grid in a period of time can be counted.

The TTI is the minimum unit for user scheduling in Long Term Evolution (LTE) and New Radio (NR). And each TTI carries the data to be transmitted in the downlink buffer area in the radio frequency signal and transmits the data.

The weights are vectors for changing the beam shape and direction. The weight value is usually determined by the network device based on the downlink channel characteristics. The determination method of the weight includes, but is not limited to, SRS weighting and PMI weighting.

The SRS weighting means that the network device calculates the characteristics of the corresponding downlink channel and calculates the weight according to the reciprocity principle by obtaining a Sounding Reference Signal (SRS) of the uplink channel of the terminal. The PMI weighting refers to that the network device selects an optimal weight value based on a Precoding Matrix Indicator (PMI) fed back by the UE in an uplink.

(2) Terminal average power statistics

Supposing that the space grid is divided into M rows and N columns, obtaining the transmitting power of the terminal on the grid through the power mapping of the weight value on the space grid, and numbering as [ i][j]The spatial grid power of is denoted p _[i][j] The base station maintains a grid power meter for each terminal, with the k terminal being in the space grid [ i ]][j]The power table above is denoted by p _k[i][j] Then the average power U of the terminal in a period of time _k The calculation is shown in the following equation (3).

Step S306, the base station detects the radiation power of the space grid, and the average radiation power of the space grid is ensured not to exceed a power threshold value within a period of time.

Step S307, the base station detects the radiation power of the terminal, and the average radiation power of the terminal is guaranteed not to exceed a threshold value within a period of time.

For example, referring to FIG. 10, FIG. 10 is a schematic diagram illustrating power control using an EMF power lock mechanism. The EMF power lock mechanism mainly comprises three steps of power detection, power back-off and downlink power control. In the process of power detection, the base station detects the radiation power of each space grid in n space grids of the coverage area, and detects the radiation power of each accessed terminal. In the power back-off process, the base station determines whether the radiation power of each spatial grid is greater than the power threshold of the spatial grid, and determines whether the radiation power of each terminal is greater than the power threshold corresponding to the terminal. And if the radiation power of one space grid is greater than the power threshold of the space grid, the base station acquires the difference between the radiation power of the space grid and the power threshold of the space grid to obtain the power back-off corresponding to the space grid. Similarly, if the radiation power of a terminal is greater than the power threshold of the terminal, the difference between the radiation power of the terminal and the power threshold of the terminal is obtained, and the corresponding power back-off of the terminal is obtained. In a Downlink (DL) Power Control (PC), the base station performs power back-off on the radiation power of the beam passing through the spatial grid and the radiation power of the beam corresponding to the terminal according to the power back-off amount.

According to the method provided by the embodiment, the radiation power of the terminal and the position of the terminal on the grid are obtained by calculating the power projection of the beam in the grid direction, the radiation power of each terminal is counted in real time, the user power is limited within a period of time, and the allowable maximum transmission power is not exceeded, so that the EMF absolute compliance is ensured within a safe distance range, and the deployment difficulty of a 5G high-power module is reduced.

Fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus 500 includes an acquisition unit 501 and a control unit 502. Optionally, the communication device 500 further comprises a transmitting unit 503.

Optionally, in view of the application scenario shown in fig. 1, the communication apparatus 500 shown in fig. 11 is provided in the network device 11 in fig. 1.

Optionally, as seen in fig. 2, the communication apparatus 500 shown in fig. 11 is configured to execute the method flow shown in fig. 2. The obtaining unit 501 is configured to support the communication apparatus 500 to perform S201 and S202 in fig. 2. The control unit 502 is configured to support the communication apparatus 500 to execute S203 in fig. 2. The transmitting unit 503 is used to enable the communication apparatus 500 to transmit at least one beam to the terminal.

Optionally, as seen in fig. 5, the communication apparatus 500 shown in fig. 11 is configured to execute the method flow shown in fig. 5. The obtaining unit 501 is configured to support the communication apparatus 500 to perform S201' and S202 in fig. 5. The control unit 502 is used to support the communication apparatus 500 to execute S203 and S204 in fig. 5.

Optionally, as shown in fig. 6, the communication apparatus 500 shown in fig. 11 is configured to execute the method flow shown in fig. 6. The obtaining unit 501 is configured to support the communication apparatus 500 to perform S301 to S305 in fig. 6. The control unit 502 is configured to support the communication apparatus 500 to perform S306 to S307 in fig. 2.

Optionally, as seen in fig. 12, the communication device 500 shown in fig. 11 is provided in the network apparatus 600 shown in fig. 12.

The apparatus embodiment depicted in fig. 11 is merely illustrative, and for example, the division of the above-mentioned units is only one type of logical functional division, and other division manners may be available in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. Each functional unit in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The various elements in the communications device 500 are implemented in whole or in part by software, hardware, firmware, or any combination thereof.

In the case of software implementation, for example, the control unit 502 and the acquisition unit 501 are implemented by software functional units generated by at least one processor 601 in fig. 12 after reading program codes stored in a memory 602.

In the case of hardware implementation, for example, the above units in fig. 11 are implemented by different hardware in the network device, respectively, for example, the control unit 502 is implemented by a part of processing resources (e.g., one core or two cores in the multi-core processor) in at least one processor 601 in fig. 12, and the obtaining unit 501 is implemented by the rest of processing resources (e.g., other cores in the multi-core processor) in at least one processor 601 in fig. 12, or implemented by a field-programmable gate array (FPGA), a coprocessor, or other programmable devices. The acquisition unit 501 and the transmission unit 503 are implemented by the network interface 603 in fig. 12.

In the case of implementation by combining software and hardware, for example, the control unit 502 is implemented by a hardware programmable device, and the obtaining unit 501 is a software functional unit generated by a CPU reading a program code stored in a memory.

The basic hardware structure of the network device is exemplified below.

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application, where the network device 600 includes at least one processor 601, a memory 602, and at least one network interface 603.

Optionally, in view of the application scenario shown in fig. 1, the network device 600 shown in fig. 12 is the network device 11 in fig. 1.

Optionally, as with fig. 2, the network device 600 shown in fig. 12 is configured to execute the method flow shown in fig. 2. The processor 601 is configured to support the network device 600 to perform S201, S202, and S203 in fig. 2. The network interface 603 is used to support the network device 600 to transmit at least one beam to the terminal.

The processor 601 is, for example, a Central Processing Unit (CPU), a Network Processor (NP), a Graphics Processing Unit (GPU), a neural-Network Processing Unit (NPU), a Data Processing Unit (DPU), a microprocessor, or one or more integrated circuits for implementing the present disclosure. For example, the processor 601 includes an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. PLDs are, for example, complex Programmable Logic Devices (CPLDs), field-programmable gate arrays (FPGAs), general Array Logic (GAL), or any combination thereof.

The Memory 602 is, for example, but not limited to, a read-only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only Memory (EEPROM), a compact disc read-only Memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Optionally, the memory 602 is separate and coupled to the processor 601 through an internal connection 604. Alternatively, the memory 602 and the processor 601 are optionally integrated.

The network interface 603 uses any transceiver or the like for communicating with other devices or a communication network. The network interface 603 includes, for example, at least one of a wired network interface or a wireless network interface. The wired network interface is, for example, an ethernet interface. The ethernet interface is for example an optical interface, an electrical interface or a combination thereof. The wireless network interface is, for example, a Wireless Local Area Network (WLAN) interface, a cellular network interface, or a combination thereof.

In some embodiments, processor 601 includes one or more CPUs, such as CPU0 and CPU1 shown in FIG. 12.

In some embodiments, network device 600 may optionally include multiple processors, such as processor 601 and processor 605 shown in FIG. 12. Each of these processors is, for example, a single-core processor (single-CPU) or, for example, a multi-core processor (multi-CPU). A processor herein may alternatively refer to one or more devices, circuits, and/or processing cores that may be configured to process data, such as computer program instructions.

In some embodiments, network device 600 also includes internal connection 604. The processor 601, the memory 602, and the at least one network interface 603 are connected by an internal connection 604. Internal connections 604 comprise pathways that convey information between the aforementioned components. Optionally, the internal connection 604 is a single board or a bus. Alternatively, the internal connections 604 are divided into an address bus, a data bus, a control bus, and the like.

In some embodiments, network device 600 also includes input-output interface 606. The input output interface 606 is connected to the internal connection 604.

Alternatively, the processor 601 may implement the method in the above embodiment by reading the program code 610 saved in the memory 602, or the processor 601 may implement the method in the above embodiment by internally storing the program code. In the case where the processor 601 implements the method in the above-described embodiment by reading the program code 610 stored in the memory 602, the program code implementing the method provided by the embodiment of the present application is stored in the memory 602.

For more details of the processor 601 to implement the above functions, reference is made to the foregoing description of the various method embodiments, which are not repeated here.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.

A refers to B and refers to the simple variation where A is the same as B or A is B.

The terms "first" and "second," and the like, in the description and in the claims of the embodiments of the present application, are used for distinguishing between different objects, and not for describing a particular order of the objects, nor are they to be construed as indicating or implying relative importance. For example, the first spatial grid and the second spatial grid are used to distinguish different spatial grids, rather than to describe a particular order of spatial grids, and it is not to be understood that the first spatial grid is more important than the second spatial grid.

In the present examples, unless otherwise specified, the meaning of "at least one" means one or more, and the meaning of "a plurality" means two or more. For example, a plurality of spatial grids refers to two or more spatial grids.

The above-described embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of power control, the method comprising:

acquiring radiation power corresponding to at least one space grid through which a terminal passes;

acquiring radiation power corresponding to the terminal according to the radiation power corresponding to the at least one space grid;

and controlling the power density of the terminal to be smaller than or equal to a power density threshold value by controlling the radiation power of at least one beam transmitted to the terminal by the network equipment according to the radiation power corresponding to the terminal.

2. The method of claim 1, wherein the radiation power corresponding to the at least one spatial grid is an average radiation power corresponding to the at least one spatial grid.

3. The method according to claim 1 or 2, wherein the radiation power corresponding to the terminal is obtained by adding up the radiation power of the at least one spatial grid.

4. The method according to any one of claims 1 to 3, wherein the controlling the power density of the terminal to be less than or equal to a power density threshold by controlling the radiation power of at least one beam transmitted to the terminal by the network device according to the radiation power corresponding to the terminal comprises:

controlling the power density of the terminal to be less than or equal to a power density threshold value by controlling the radiation power of at least one beam transmitted to the terminal by the network equipment not to exceed the power threshold value;

wherein the power threshold is obtained according to the power density threshold.

5. The method of claim 4, wherein the power threshold and the power density threshold satisfy the following equations:

6. The method of claim 5, wherein the at least one spatial grid corresponds to a safety distance that is a minimum safety distance of the safety distances of the at least one spatial grid.

7. The method according to any one of claims 4 to 6, wherein the controlling the power density of the terminal to be less than or equal to a power density threshold value by controlling the radiation power of at least one beam transmitted by the network device to the terminal not to exceed the power threshold value comprises:

and performing power backoff on the radiation power of at least one beam transmitted to the terminal by the network device according to a power backoff amount under the condition that the radiation power corresponding to the terminal is greater than the power threshold, wherein the power backoff amount comprises a difference value between the radiation power corresponding to the terminal and the power threshold.

8. The method of any of claims 1-7, wherein the at least one spatial grid comprises a first spatial grid, and wherein the radiated power of the first spatial grid is determined from a power projection of each of at least one beam emitted by the network device over a historical period of time onto the first spatial grid.

9. The method of claim 8, wherein the radiated power of the first spatial grid is accumulated from power projections of each of at least one beam transmitted by the network device over a historical period of time on the first spatial grid.

10. The method according to any one of claims 1 to 9,

the at least one beam is a beam of which the power of the plurality of beams of the terminal meets a preset condition.

11. A communications apparatus, the apparatus comprising:

the terminal comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring the radiation power corresponding to at least one space grid through which the terminal passes;

the obtaining unit is further configured to obtain a radiation power corresponding to the terminal according to the radiation power corresponding to the at least one spatial grid;

and the control unit is used for controlling the power density of the terminal to be smaller than or equal to a power density threshold value by controlling the radiation power of at least one wave beam transmitted to the terminal by the network equipment according to the radiation power corresponding to the terminal.

12. The apparatus of claim 11, wherein the radiation power corresponding to the at least one spatial grid is an average radiation power corresponding to the at least one spatial grid.

13. The apparatus according to claim 11 or 12, wherein the radiation power corresponding to the terminal is obtained by adding up the radiation power of the at least one spatial grid.

14. The apparatus according to any of claims 11 to 13, wherein the control unit is specifically configured to control the power density of the terminal to be less than or equal to a power density threshold by controlling a radiation power of at least one beam transmitted by the network device to the terminal not to exceed the power threshold;

15. The apparatus of claim 14, wherein the power threshold and the power density threshold satisfy the following equations:

16. The apparatus of claim 15, wherein the at least one spatial grid corresponds to a safety distance that is a minimum safety distance of the safety distances of the at least one spatial grid.

17. The apparatus according to any one of claims 14 to 16, wherein the control unit is specifically configured to, when the radiation power corresponding to the terminal is greater than the power threshold, perform power backoff on the radiation power of at least one beam transmitted to the terminal by the network device according to a power backoff amount, where the power backoff amount includes a difference between the radiation power corresponding to the terminal and the power threshold.

18. The apparatus of any of claims 11 to 17, wherein the at least one spatial grid comprises a first spatial grid, wherein the radiation power of the first spatial grid is determined from a power projection of each of at least one beam emitted by the network device over a historical period of time onto the first spatial grid.

19. The apparatus of claim 18, wherein the radiated power of the first spatial grid is accumulated over a power projection of the first spatial grid for each of at least one beam transmitted by the network device over a historical period of time.

20. A network device, characterized in that the network device comprises a processor for executing instructions causing the network device to perform the method of any of claims 1 to 10 and a network interface for transmitting at least one beam.

21. A computer-readable storage medium having stored therein at least one instruction which, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 10.