WO2019052402A1

WO2019052402A1 - Signal transmission method, related apparatus and system

Info

Publication number: WO2019052402A1
Application number: PCT/CN2018/104564
Authority: WO
Inventors: 杜建伟; 韩波
Original assignee: 华为技术有限公司
Priority date: 2017-09-12
Filing date: 2018-09-07
Publication date: 2019-03-21
Also published as: CN109495193A

Abstract

Provided are a signal transmission method and apparatus, and a related device. The method may comprise: a first network device receiving a first test sequence; the first network device determining channel state information according to the first test sequence; and the first network device determining a human body detection result according to the channel state information. The method of the present application can utilize the existing device to bear a second test sequence through a wireless subframe, thereby realizing a human body detection function at a low cost.

Description

Signal transmission method, related device and system

Technical field

The present application relates to the field of human body detection and communication technologies, and in particular, to a signal transmission method, related device and system.

Background technique

At present, people pay more and more attention to security protection, and prepare for work to deal with attacks or avoid injuries, thereby ensuring property security and real-time monitoring of the current environment. More and more places, such as shopping malls, museums, hospitals, homes, companies, etc., are applied to security products. Currently, security products have human body detection capabilities, which can be implemented based on infrared or camera-based, as detailed below.

Security products that implement human body detection based on infrared light can include active infrared radiation systems. The active infrared radiation system consists of an active infrared emitter and an active infrared receiver, and the infrared beam is formed by focusing the beam between the emitter and the receiver. When an object crosses its detection area, the infrared beam is blocked and the receiver automatically recognizes the change in the received infrared beam and triggers an alarm. The realization of human body detection based on infrared has the following disadvantages: 1. The adaptability is poor, and only the linear boundary can be detected; 2. The active infrared radiation system cannot distinguish the size and type of objects passing through the detection area, and small animals, birds, branches, etc. may cause False positive; 3, susceptible to weather such as fog, rain, snow; 4, high deployment costs.

Security products based on cameras for human body detection may include a monitoring system. The monitoring system consists of a camera and a software system, which can obtain real-time monitoring of effective data such as images and sounds, and can detect whether someone has invaded. The realization of human body detection based on the camera has the following disadvantages: 1. The camera cannot pass through obstacles such as furniture and slab walls, and the monitoring range is limited; 2. The camera needs better lighting conditions, and the real-time environment cannot be effectively monitored at night and in a complicated environment.

Due to the shortage of the above-mentioned existing security products, there is a need for a security product that can realize the human body detection function, overcome the above shortcomings, and realize the security function.

Summary of the invention

The present application provides a signal transmission method, related apparatus and system, which can transmit a test sequence by using a guard interval in a wireless subframe, obtain channel state information through a test sequence, and can determine a human body detection result through the channel state information.

In a first aspect, the present application provides a signal transmission method, the method may include: a first network device receives a first test sequence; and the first network device determines channel state information according to the first test sequence; A network device determines a human body detection result according to the channel state information.

In the present application, the first test sequence is obtained by transmission of a second test sequence sent by the sending device over a wireless channel, where the sending device is a terminal device, the first network device, or a second network device. The scenarios of the three transmitting devices are separately described below.

Where the transmitting device is the terminal device, the second test sequence is carried in an uplink time slot of a wireless subframe; the second test sequence occupies at least one symbol. The second test sequence is sent by using the guard interval in the wireless subframe, and does not interfere with the uplink signal carried by the uplink time slot and the downlink signal carried by the downlink time slot in the wireless subframe.

Where the transmitting device is the first network device, the second test sequence is carried in a guard interval of the wireless subframe; the second test sequence occupies at least one symbol. The second test sequence is sent by using the uplink time slot in the wireless subframe, and does not interfere with the uplink signal carried by the uplink time slot and the downlink signal carried by the downlink time slot in the wireless subframe.

In the case that the sending device is the second network device, the second test sequence is carried in at least one of an uplink time slot, a downlink time slot or a guard interval of the wireless subframe; The test sequence occupies at least one symbol. The second test sequence is transmitted by using an OFDM symbol at any position in the wireless subframe, which has high flexibility.

In an optional embodiment, where the sending device is the first network device, before the sending, by the first network device, the second test sequence, the method further includes: determining, by the first network device, at least one of the following according to the environment information And a location where the second test sequence is located, at least one transmit antenna, or at least one receive antenna; the second test sequence is located at a position where the guard interval of the wireless subframe carries at least the second test sequence a location at which a symbol is transmitted; the second test sequence is transmitted by the at least one transmit antenna, and the first test sequence is received by the at least one receive antenna.

In an optional embodiment, in the at least one transmitting antenna, the location of the second test sequence sent by each transmitting antenna is different. This situation is equivalent to distinguishing the second test sequence transmitted by each transmitting antenna in time, and does not interfere with transmission or reception signals of other antennas.

In an optional embodiment, in the at least one transmitting antenna, each transmitting antenna sends the second test sequence by using a different frequency band. This situation is equivalent to distinguishing the second test sequence transmitted by each transmitting antenna in the frequency band, and does not interfere with the transmitting or receiving signals of other antennas.

In this application, human activities affect the wireless channel, and the influence of the wireless channel has a certain law. Therefore, the channel state information can reflect the human activity. In the present application, the human body detection result may be obtained by extracting the feature values in the channel state information for pattern matching, and the human body detection result may include at least one of the following: whether there is a person, a number of personnel, a person movement, and a direction in which the person travels.

Optionally, the first test sequence is any one of an SRS sequence, a ZC sequence, or a customized sequence.

Optionally, the human body detection result is used in at least one of the following: intrusion detection, monitoring, and intelligent control.

In a second aspect, the present application provides a first network device for performing the signal transmission method described in the first aspect. The network device can include a memory and a processor, a transmitter and a receiver coupled to the memory, wherein: the transmitter is for transmitting signals to a terminal or other network device, the receiver is for receiving a terminal or other a signal transmitted by the network device, the memory for storing implementation code of the signal transmission method described in the first aspect, the processor for executing program code stored in the memory, ie performing the first aspect or the first aspect A signal transmission method provided by any of the embodiments.

In a third aspect, the present application provides a first network device, including a plurality of functional modules, for respectively performing the method provided by any one of the first aspect or the possible embodiments of the first aspect.

In a fourth aspect, a communication system is provided, the communication system comprising: a first network device, wherein: the first network device is configured to send a second test sequence, and receive a first test sequence, according to the first test The sequence determines channel state information, and based on the channel state information, determines a human body detection result. In some optional embodiments, the first network device may be the network device described in the second aspect or the third aspect.

According to a fifth aspect, a communication system is provided, the communication system includes: a first network device and a terminal device, where: the terminal device is configured to send a second test sequence, and receive a first test sequence, according to the first The test sequence determines channel state information, and based on the channel state information, determines a human body detection result. In some optional embodiments, the first network device may be the network device described in the second aspect or the third aspect.

According to a sixth aspect, a communication system is provided, the communication system includes: a first network device and a second network device, wherein: the second network device is configured to send a second test sequence, and receive the first test sequence, according to The first test sequence determines channel state information, and according to the channel state information, determines a human body detection result. In some optional embodiments, the first network device may be the network device described in the second aspect or the third aspect.

A seventh aspect, a computer readable storage medium storing program code for implementing the signal transmission method described in the first aspect, the program code comprising the signal transmission method described in the first aspect Execute the instruction.

According to an eighth aspect, a computer readable storage medium storing program code for implementing the signal transmission method described in the first aspect, the program code comprising the signal transmission method described in the first aspect, is provided Execute the instruction.

In the implementation of the present application, the second test sequence can be carried by using the wireless subframe, the sending device sends the second test sequence, the first network device receives the first test sequence, and determines the channel state information, and the human body detection result can be determined by the channel state information. By implementing the present application, the human body detection function can be realized at a low cost by using existing equipment.

DRAWINGS

1A is a schematic structural diagram of a radio frame according to the present application;

1B-1C are schematic diagrams showing the number of symbols respectively occupied by three special time slots in several configurations according to the present application;

2 is a schematic structural diagram of a network device provided by the present application;

FIG. 3 is a schematic flowchart diagram of a signal transmission method provided by the present application;

4 is a schematic diagram of a possible antenna distribution provided by the present application;

5 is a schematic diagram of cooperative interaction of various components in the network device described in the embodiment of FIG. 2 and the network device described in the embodiment of FIG. 3;

FIG. 6 is a schematic flowchart diagram of another signal transmission method provided by the present application;

FIG. 7 is a schematic flowchart diagram of still another signal transmission method provided by the present application;

FIG. 8 is a schematic diagram of functional modules of a first network device according to the present application.

Detailed ways

The present application is described below in conjunction with the accompanying drawings. The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

The present application is based on a Long Term Evolution (LTE) Time Division Duplexing (TDD) mode of operation of a universal mobile communication technology, and utilizes a radio frame transmission signal in a TDD-LTE system. TDD relies on time to distinguish between uplink and downlink, and time resources are allocated in two directions. The base station transmits signals to the mobile station only in the downlink time slot in the radio frame, and the mobile station transmits signals only to the base station in the uplink time slot in the radio frame, so the resources in one direction are discontinuous in time.

Referring to FIG. 1A, FIG. 1A is a schematic diagram of a structure of a radio frame in a TDD-LTE system. The radio frame structure in the TDD-LTE system is also called frame structure type 2, and one radio frame length is 10 ms, including two 5 ms half frames. Each field consists of 5 consecutive subframes (including regular subframes and special subframes), each subframe having a length of 1 ms. The conventional subframe is composed of two regular slots, and the length of one regular slot is 0.5 ms; the special subframe is fixed in

subframes

1 and 6, and is uplink and downlink (UpPTS) and downlink. The pilot time slot (DwPTS) and the guard interval (GP) are composed of three special time slots. The total length of the special subframe is 1 ms, and the length occupied by the three special time slots is configurable.

Each time slot consists of a number of frequency division multiple access (FDMA) symbols including a cyclic prefix (CP). If it is a normal CP (normal CP) type, each time slot includes 7 OFDM symbols, and if it is an extended CP type (extended CP), each time slot includes 6 OFDM symbols.

In a special subframe, the number of OFDM symbols occupied by the three special time slots may be determined according to the configuration. Combining the length of the DwPTS, the GP, the UpPTS, and the length of each OFDM symbol in each configuration, the number of OFDM symbols occupied by each part in the special subframe can be obtained. Referring to FIG. 1B and FIG. 1C, FIG. 1B shows the number of OFDM symbols occupied by three special time slots in several configurations in the case of a normal CP, and FIG. 1C shows the case of several configurations when the extended CP is used. The number of OFDM symbols occupied by the three special time slots. The configuration is not limited to the configuration shown in FIG. 1B and FIG. 1C. In a specific implementation, there may be more configurations. In other configurations, the number of OFDM symbols occupied by a special time slot may be calculated.

1A-1C illustrate a radio frame in a TDD-LTE system. In future radio access technologies, the length and name of a radio frame, a subframe, a DwPTS, a GP, an UpPTS, and the like may change. Applicable to the changed scene.

Referring to Figure 2, there is shown a network device 20 provided by some embodiments of the present application. As shown in FIG. 2, network device 20 may include a communication interface 203, one or more network device processors 201, a transmitter 207, a receiver 209, a coupler 211, an antenna 213, and a memory 205. These components can be connected by bus or other means, and FIG. 2 is exemplified by a bus connection. among them:

Communication interface 203 can be used by network device 20 to communicate with other communication devices, such as with terminal devices, application servers, or other network devices. In a specific implementation, the communication interface 203 may be a network communication interface, such as an LTE (4G) communication interface, a 5G or a future communication interface of a new air interface. Not limited to the wireless communication interface, the network device 20 may also be configured with a wired communication interface to support wired communication. For example, a backhaul link between one network device 20 and other network devices 20 is a wired communication connection.

The antenna 213 can be used to convert electromagnetic energy in a transmission line into electromagnetic waves in free space, or to convert electromagnetic waves in free space into electromagnetic energy in a transmission line. The coupler 211 can be used to divide the communication signal into multiple channels and distribute it to a plurality of receivers 209. In the present application, the network device 20 is provided with a plurality of antennas 213.

The transmitter 207 can be configured to perform a transmission process on a signal output by the network device processor 201 for transmitting signals to other network devices, terminal devices, or application servers. The receiver 209 can be configured to receive a signal received by the antenna 213 for receiving signals transmitted by other network devices, terminal devices, or application servers. In some embodiments of the present application, transmitter 207 and receiver 209 can be viewed as a wireless modem. In the network device 20, the number of the transmitter 207 and the receiver 209 may each be one or more.

Memory 205 is coupled to network device processor 201 for storing various software programs and/or sets of instructions. In particular implementations, memory 205 can include high speed random access memory, and can also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory 205 can store an operating system (hereinafter referred to as a system) such as an embedded operating system such as uCOS, VxWorks, or RTLinux. The memory 205 can also store a network communication program that can be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices, one or more application servers.

In some embodiments of the present application, the memory 205 can be used to store an implementation of the signal transmission method provided by one or more embodiments of the present application on the network device 20 side. For implementation of the signal transmission method provided by one or more embodiments of the present application, please refer to the subsequent embodiments.

The network device processor 201 can be used to perform wireless channel management, implement call and communication link establishment and teardown, and control the handoff of user equipment in the control area. In a specific implementation, the network device processor 201 may include: an Administration Module/Communication Module (AM/CM) (a center for voice exchange and information exchange), and a Basic Module (BM). Complete call processing, signaling processing, radio resource management, radio link management and circuit maintenance functions, Transcoder and SubMultiplexer (TCSM) (for multiplexing demultiplexing and code conversion) Function) and so on.

In an embodiment of the invention, network device processor 201 is operable to read and execute computer readable instructions. Specifically, the network device processor 201 can be used to invoke a program stored in the memory 205, for example, the implementation of the signal transmission method provided by one or more embodiments of the present application on the network device 20 side, and execute the instructions included in the program. .

In a specific implementation, the network device 20 may be implemented as a base transceiver station, a wireless transceiver, a basic service set (BSS), an extended service set (ESS), a NodeB, an eNodeB, and the like. Network device 20 may be implemented as several different types of base stations, such as macro base stations, micro base stations, and the like. Network device 20 may support different wireless technologies, such as cell radio access technology, or WLAN radio access technology, and the like.

It should be noted that the network device 20 shown in FIG. 2 is only an implementation manner of the embodiment of the present invention. In actual applications, the network device 20 may further include more or fewer components, which are not limited herein.

Based on the foregoing radio frame and the network device 20 in the TDD-LTE system, the present application provides a signal transmission method, related device, and system, which can utilize the existing device to realize human body detection at low cost without changing the protocol. Features.

The main inventive principle of the present application may include: the transmitting device transmits the test sequence by using the wireless frame, and the network device receives the test sequence after the transmission through the wireless channel, and the network device may extract the wireless channel through the test sequence because the human body movement may affect the fluctuation of the wireless channel. Features, and use the wireless channel characteristics to output human body detection results.

In the present application, the test sequence sent by the sending device may be referred to as a second test sequence, and the test sequence received by the network device may be referred to as a first test sequence, and the first test sequence is obtained by transmitting the second test sequence over the wireless channel. of.

In the present application, the first test sequence and the second test sequence may be SRS sequences, ZC sequences or custom sequences, or may be other types of test sequences. When the first test sequence is a customized sequence, the customized sequence can be dedicated to the signal transmission method in the present application, and is not confused with other sequences transmitted simultaneously in the radio frame.

This application can include the following key technical points:

(1) The position of the second test sequence sent by the transmitting device in the wireless subframe

In this application, the device that receives the first test sequence is a network device, and the network device may be the network device shown in FIG. 2 above, and the network device may be referred to as a first network device.

The device that sends the second test sequence may have the following three types: the first network device, another network device, or the terminal device. The following is a description of the situation.

(1) The transmitting device is the first network device, and the second test sequence is carried in a guard interval (GP) of the wireless subframe.

In this case, the first network device sends a second test sequence, which is carried in the guard interval of the wireless subframe and occupies at least one OFDM symbol. Here, the at least one OFDM symbol occupied by the second test sequence may be continuous or non-contiguous.

Optionally, the second test sequence may occupy any number of OFDM symbols from 1 to (the number of OFDM symbols occupied by the GP-1), wherein the number of OFDM symbols occupied by the GP and the special subframe in FIG. 1A-1C For specific configuration, refer to the related description.

In an optional embodiment, the first network device may be an indoor base station, and in the guard interval GP in the radio frame, only one OFDM symbol may be reserved as an uplink and downlink conversion protection band, and the remaining OFDM symbols may be used to carry the second test. sequence.

In the case of the first (1), the second test sequence is transmitted by using the GP in the wireless subframe, and the uplink signal carried by the uplink time slot and the downlink signal carried by the downlink time slot in the wireless subframe are not interfered.

(2) The sending device is another network device, and the second test sequence is carried in at least one of an uplink time slot, a downlink time slot, or a guard interval of the wireless subframe.

Taking the sending device as the second network device as an example, the second network device can communicate with the first network device using the same standard protocol. In this case, the second network device sends a second test sequence, which may be carried in any location in the wireless subframe and occupy at least one OFDM symbol. Here, the at least one OFDM symbol occupied by the second test sequence may be continuous or non-contiguous.

In the case of (2), the second test sequence can be transmitted using an OFDM symbol at any position in the wireless subframe, which has high flexibility.

(3) The transmitting device is a terminal device, and the second test sequence is carried in an uplink time slot of the wireless subframe.

In the present application, the terminal device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a mobile internet device (MID), a wearable device (such as a smart watch (iwatch, etc.), a smart bracelet, etc.), and the like. It may be an Internet of Things terminal device such as a refrigerator, a washing machine, a television, a rice cooker, etc., which can transmit wireless signals, and the present application does not impose any restrictions.

In this case, the terminal device sends a second test sequence, which is carried in the uplink time slot of the wireless subframe and occupies at least one OFDM symbol. Here, the at least one OFDM symbol occupied by the second test sequence may be continuous or non-contiguous.

In the case of the third (3) case, the second test sequence is transmitted by using the uplink time slot in the wireless subframe, and the uplink signal carried by the uplink time slot and the downlink signal carried by the downlink time slot in the wireless subframe are not interfered.

The first network device, when receiving the first test sequence, carries the second test sequence in the corresponding wireless subframe, corresponding to the location of the sending device and the second test sequence in the foregoing cases. Received in OFDM symbols.

(2) Determining the human body detection result according to channel state information (CSI)

In this application, human activities affect the wireless channel, and the influence of the wireless channel has a certain regularity. Therefore, the channel state information can reflect the human activity. In the present application, the human body detection result can be obtained by extracting the feature values in the CSI for pattern matching. Specifically, cocoa first performs wavelet transform, fast fourier transformation (FFT) transformation, etc., and then performs algorithms such as singular value decomposition (SVD) and principal component analysis (PCA). Or the method extracts the feature values, and finally performs pattern matching to obtain the corresponding detection result.

In the present application, the human body detection result may include at least one of the following: whether there are people, the number of personnel, the movement of the person, and the direction in which the person travels.

In an alternative embodiment, the number of people may include the number of all personnel within the signal coverage of the transmitting device and the network device receiving the signal. Personnel actions may include physical manipulation of individual personnel, such as raising hands, clapping, walking, running, high jump, long jump, nodding, and the like. The direction of travel of the person may include the direction of movement of each person, for example, eastward, westward, southward, northward, and the like.

In the present application, the three types of transmitting devices described in the above key technical point (1) correspond to different embodiments, which are further described below.

Referring to FIG. 3, FIG. 3 is a schematic flowchart of a signal transmission method according to an embodiment of the present application. The embodiment of Fig. 3 combines the first (1) case and the above-mentioned key technical point (2) in the above-mentioned key technical points (1). The description is expanded below.

In the embodiment of FIG. 3, the devices that receive the first test sequence and send the second test sequence are all first network devices.

S101. The first network device sends a second test sequence.

Referring to the case (1) in the above key technical point (1), the second test sequence may be carried in the guard interval GP of the wireless subframe and occupy at least one OFDM symbol.

In this application, the first network device may include multiple antennas. When the first network device sends the second test sequence, the antenna that transmits the second test sequence may be referred to as a transmit antenna. Correspondingly, when receiving the first test sequence, the first network device receives the antenna through the at least one antenna, and the antenna that receives the first test sequence may be referred to as a receiving antenna.

In an optional embodiment, before transmitting the second test sequence, the first network device determines at least one of a transmitting antenna or a receiving antenna according to the current environment information and a certain policy, where one transmitting antenna corresponds to at least one receiving antenna. .

Specifically, the current environment information may include at least one of: a location where each antenna is located, a number of first network devices, a number of time slots carrying the second sounding sequence, a range of detection, and the like. The choice of transmit antenna or receive antenna depends on the actual deployment environment. For example, in a square hall, only the security detection is required near the door, then the first network device only needs to control the two antennas near the door to send the second detection sequence.

Specifically, the policy may include a multiple-received multi-receipt policy, a single-issue single-receiving strategy, and a single-issue multi-receiving strategy.

For example, as shown in FIG. 4, it is assumed that the network device is provided with three antennas, and three antennas are linearly distributed.

In a possible manner, the first network device may determine that the transmitting antenna is the antenna 1 and the corresponding receiving antennas are the

antennas

2 and 3 according to the single-transmit multi-receiving policy and the distribution of the antenna.

In another possible manner, the first network device may further determine two sets of transceiver antennas according to the multi-received multi-receiving policy and the distribution of the antenna, the first group, the transmitting antenna is the antenna 1, and the corresponding receiving antenna is the antenna 2; In the second group, the transmitting antenna is the antenna 2, and the corresponding receiving antenna is the antenna 3.

It is not limited to the optional case in the above exemplary embodiment. In the specific implementation, there may be more implementation forms, which are not limited in this application.

In an optional embodiment, after determining the transmitting antenna, the first network device further determines, according to the current environment information, a location where the second test sequence is located, that is, determining at least one symbol that carries the second test sequence in the guard interval of the wireless subframe. The current environment information can be referred to the related description. For example, the symbol that carries the second test sequence determined by the first network device may be one, and may be the symbol 5 in the guard interval GP in the case of configuration 0 in FIG. 1B.

Further, the first network device may determine the location of the same second test sequence for all the transmit antennas, and may determine the location of the different second test sequence for different transmit antennas.

In an alternative embodiment, in the case that there are multiple transmit antennas, in order to avoid interference with other antenna transmit or receive signals, the present application may use the following two transmission strategies to send a second test sequence through multiple transmit antennas:

In the first transmission policy, the second test sequence sent by each transmitting antenna is located at a different location, that is, the position of at least one symbol carrying the second test sequence in the wireless subframe transmitted by each transmitting antenna is different.

In this case, the first network device needs to determine the location of the corresponding second test sequence for each transmit antenna.

For example, assume that the antenna configuration of the first network device is as shown in FIG. 4, the transmitting antenna includes the antenna 1 and the antenna 2, the receiving antenna corresponding to the antenna 1 is the antenna 2, and the receiving antenna corresponding to the antenna 2 is the antenna 3. The first network device may determine, for the antenna 1, the location of the second test sequence sent: it may be the symbol 4 in the guard interval GP in the case of configuration 0 in FIG. 1B; the second test sequence in which the transmission is determined may be determined for the antenna 2 Location: It can be the symbol 5 in the guard interval GP in the case of configuration 0 in Figure 1B.

The first type of transmission strategy is equivalent to distinguishing the second test sequence sent by each transmitting antenna in time, and does not interfere with sending or receiving signals of other antennas.

In the second transmission strategy, each transmitting antenna transmits a second test sequence using a different frequency band.

For example, assume that the antenna configuration of the first network device is as shown in FIG. 4, the transmitting antenna includes the antenna 1 and the antenna 2, the receiving antenna corresponding to the antenna 1 is the antenna 2, and the receiving antenna corresponding to the antenna 2 is the antenna 3. The first network device may use frequency band 1 and transmit a second test sequence through antenna 1, use frequency band 2, and transmit a second test sequence through antenna 2.

The second transmission strategy described above is equivalent to distinguishing the second test sequence sent by each transmitting antenna in the frequency band, and does not interfere with sending or receiving signals of other antennas.

It can be understood that the period, power, and the like when the first network device sends the second test sequence through each transmitting antenna may be determined autonomously by the first network device, or may be specified by a standard protocol.

S102. The first network device receives the first test sequence.

Corresponding to step S102, the second test sequence is transmitted through the wireless channel to obtain a first test sequence, and the first network device receives the first test sequence by using the receive antenna, and the first test sequence is obtained by transmitting the second test sequence over the wireless channel. of. Specifically, the first network device receives the first test sequence by using a receiving antenna corresponding to the transmitting antenna.

For example, it is assumed that the antenna configuration of the first network device is as shown in FIG. 4, and the first network device may further determine two sets of antennas according to the policy of multiple transmit and receive, the first group, the transmit antenna is the antenna 1, and the corresponding receive antenna The antenna 2 is the second group, the transmitting antenna is the antenna 2, and the corresponding receiving antenna is the antenna 3. In this case, the antenna 2 receives the second test sequence transmitted by the antenna 1, and the antenna 3 receives the second test sequence transmitted by the antenna 2.

Optionally, corresponding to the two sending policies in step S101, the first test sequence is received by the same receiving policy in the present application, which is described in detail below.

Under the above first transmission strategy, the location of the second test sequence sent by each transmitting antenna is different. Correspondingly, the receiving antennas corresponding to the respective transmitting antennas respectively receive the first test sequence on the OFDM symbol corresponding to the second test sequence in the wireless subframe.

For example, corresponding to the example in the first transmission strategy described above, the first network device receives the first test sequence on the symbol 4 in the guard interval GP through the antenna 2, and receives the symbol 3 on the guard interval GP through the antenna 3. The first test sequence.

In the second transmission strategy described above, each receiving antenna receives the first test sequence using a different frequency band.

For example, corresponding to the example in the second transmission strategy, the first network device uses the frequency band 1 and receives the first test sequence through the antenna 2, uses the frequency band 2, and receives the first test sequence through the antenna 3.

It can be understood that the period, power, and the like of the first network device received by the first network device through the respective receiving antennas are the same as the corresponding transmitting antennas.

S103. The first network device determines channel state information according to the first test sequence.

In the present application, the second test sequence is transmitted in the wireless channel and is affected by the wireless channel, causing signal attenuation, reflection, scattering, and the like. The first network device may perform a comparative analysis on the second test sequence and the first test sequence to extract signal characteristics, and may estimate the influence of the wireless channel received by the second test sequence during transmission, and quantize it into channel state information.

S104. The first network device determines a human body detection result according to the channel state information.

In the present application, the human body detection result may include at least one of the following: whether there is a person, a number of people, a movement of a person, or a direction of travel. For details, refer to the related description in the key technical point (2), and details are not described herein.

In the present application, the human body detection result can be applied to at least one of the following: intrusion detection, monitoring, and intelligent control.

The first test sequence is sent by the GP in the wireless subframe by using the GP in the wireless subframe, and the first test sequence is sent, and the first test sequence is received, and the channel state information is determined by using the first test sequence. The channel state information determines the human body detection result. In the embodiment of FIG. 6, the human body detection can be completed only by the first network device, and the network elements involved are few, the operation is simple, and the implementation is easy.

The cooperation relationship between the components in the first network device in the embodiment of the present invention is described below with reference to FIG. 5 by using a detailed example. In FIG. 5, it is assumed that the network device is provided with three antennas: antenna 1, antenna 2, and antenna 3.

1. The processor 201 determines that the antenna 1 transmits the second test sequence according to the current environment information, and the antenna 2 and the antenna 3 receive the first test sequence.

2. The processor 201 determines, according to the current environment information, that the symbol 5 of the guard interval GP is used to carry the second test sequence, and the configuration of the special time slot in the wireless subframe is the configuration 0 in FIG. 1B.

3. The processor 201 instructs the transmitter 207 to transmit a second test sequence in the symbol 5 of the guard interval GP in the radio subframe.

4. The processor instructs the receiver 209 to receive the first test sequence in the symbol 5 of the guard interval GP in the wireless subframe.

5. The transmitter 207 carries the second test sequence to be transmitted in the symbol 5 of the guard interval GP in the wireless subframe, and performs a series of processing to convert the wireless subframe into a radio frequency signal.

Here, the transmitter 207 can perform processing such as frequency conversion, filtering, linear power amplification, and the like on the second test sequence to be transmitted.

6. The transmitter 207 transmits the radio frequency signal to the antenna 1.

7. Antenna 1 converts the RF signal into an electromagnetic wave transmission.

8. Antenna 2 and antenna 3 receive electromagnetic waves and convert the electromagnetic waves into radio frequency signals.

9. Antenna 2 and antenna 3 communicate the radio frequency signal to receiver 209.

10. The receiver 209 performs a series of processing on the received radio frequency signal, converts the radio frequency signal into a radio subframe, and extracts the first test sequence in the symbol 5 of the guard interval GP in the radio subframe.

11. The receiver 209 passes the first test sequence to the processor 201.

12. The processor 201 determines channel state information according to the first test sequence, and determines a human body detection result according to the channel state information.

Referring to FIG. 6, FIG. 6 is a schematic flowchart diagram of another signal transmission method according to an embodiment of the present application. The embodiment of Fig. 3 combines the second (2) case in the above key technical point (1) and the above-mentioned key technical point (2). The description is expanded below.

In the embodiment of FIG. 6, the second network device sends a second test sequence, and the first network device receives the first test sequence.

S201. The second network device sends a second test sequence.

Referring to the second (2) case of the above key technical point (1), the second test sequence may be carried in any position of the wireless subframe and occupy at least one OFDM symbol.

Optionally, the location of the second test sequence and the transmit antenna that sends the second test sequence may be determined by the second network device according to the current environment information, or may be specified by a standard protocol. For the current environment information, refer to the related description in the embodiment of FIG. 3, and details are not described herein. At least one of a period, a power, and a frequency band when the second network device sends the second test sequence may be determined autonomously by the second network device, or may be specified by a standard protocol.

In an alternative embodiment, the location of the second test sequence sent by each transmitting antenna may be different, and each transmitting antenna may also send the second test sequence through different frequency bands, and the application does not impose any limitation.

S202. The first network device receives the first test sequence.

In the present application, the second test sequence is transmitted through the wireless channel to obtain a first test sequence, and the first network device can autonomously determine the receive antenna and receive the first test sequence through the determined receive antenna. Optionally, the first network device is further received by scanning, that is, receiving the first test sequence on each antenna, and finally combining the received first test sequence.

In the present application, the first network device receives the location of the first test sequence, and the location of the second network device sends the second test sequence. For example, the configuration of the wireless subframe is as shown in FIG. 1B. If the second network device sends the second test sequence on the symbol 4 in the guard interval GP in the wireless subframe, the corresponding first network device The first test sequence is received on symbol 4 in the guard interval GP in the wireless subframe.

It can be understood that the period, power, and the like of the first network device receiving the first test sequence are the same as when the second network device sends the second test sequence.

S203. The first network device determines channel state information according to the first test sequence.

S204. The first network device determines a human body detection result according to the channel state information.

It is to be understood that the specific implementations of the steps S203-S204 and the steps S103-S104 in the embodiment of FIG. 3 are the same, and the related description is omitted, and details are not described herein.

The second test sequence is sent by the second network device by using the uplink time slot, the GP or the downlink time slot in the wireless subframe, and the first network device receives the first test sequence, by using the method described in the embodiment of FIG. The channel state information is determined, and the human body detection result is determined by the channel state information. In the embodiment of FIG. 6, the signal coverage of the second network device and the first network device is wide, and the signal coverage may be expanded by setting a plurality of second network devices to perform human body detection on the area within the signal coverage. The method illustrated in the embodiment of Fig. 6 can be applied to scenes requiring human body detection in a wide area.

Referring to FIG. 7, FIG. 7 is a schematic flowchart diagram of still another signal transmission method according to an embodiment of the present application. The embodiment of Fig. 3 combines the third (3) case in the above key technical point (1) and the above-mentioned key technical point (2). The description is expanded below.

In the embodiment of FIG. 6, the terminal device sends a second test sequence, and the first network device receives the first test sequence.

S301. The terminal device sends a second test sequence.

Referring to the third (3) case of the above key technical point (1), the second test sequence may be carried in an uplink time slot of the wireless subframe and occupy at least one OFDM symbol.

Optionally, the location of the second test sequence and the transmit antenna that sends the second test sequence may be determined by the terminal device according to the current environment information, or may be specified by a standard protocol. For the current environment information, refer to the related description in the embodiment of FIG. 3, and details are not described herein. At least one of the period, the power, and the frequency band when the terminal device sends the second test sequence may be determined autonomously by the terminal device, or may be specified by a standard protocol.

S302. The first network device receives the first test sequence.

In the present application, the first network device receives the location of the first test sequence, and the location where the terminal device sends the second test sequence. For example, the configuration of the wireless subframe is as shown in FIG. 1B. If the terminal device sends the second test sequence on the symbol 4 in the guard interval GP in the wireless subframe, the corresponding first network device is wireless. The first test sequence is received on symbol 4 in the guard interval GP in the subframe.

It can be understood that the period, power, and the like of the first network device receiving the first test sequence are the same as when the terminal device sends the second test sequence.

S303. The first network device determines channel state information according to the first test sequence.

S304. The first network device determines a human body detection result according to the channel state information.

It is to be understood that the specific implementations of the steps S103-S304 and the steps S103-S104 in the embodiment of FIG. 3 are the same, and the related description is omitted, and details are not described herein.

The second test sequence is carried by the uplink time slot in the wireless subframe by using the method described in the embodiment of FIG. 7. The terminal device sends a second test sequence, and the first network device receives the first test sequence, and determines channel state information, and uses the channel. The status information determines the results of the human body detection. In the embodiment of FIG. 6, the second test sequence can be sent by multiple terminal devices, and the first network device determines the human body detection result more accurately by receiving the plurality of first test sequences. In addition, when there is a terminal device entering the signal coverage of the first network device, the method shown in FIG. 6 can be implemented, and the embodiment of FIG. 6 makes full use of the available terminal devices. Moreover, the signal coverage of the plurality of terminal devices and the first network device is wide, and can be applied to a scenario in which human body detection is required in a large area.

The above FIG. 3, FIG. 6, and FIG. 7 embodiments respectively describe three signal transmission methods, the main difference being that the transmission devices are different. The above three signal transmission methods are capable of realizing human body detection functions, and have the following advantages: strong adaptability, wireless signals are not affected by boundary shapes and complex environments, and can pass through obstacles such as furniture and slab walls, and the detection range is not affected. Limitations; When calculating human body detection results through CSI, the control algorithm can improve the accuracy of calculation, reduce or avoid the detection of small animals or other objects; be free from weather, and the deployment cost is low.

The signal transmission method in this application can be applied to the following two major scenarios:

The first scenario is applied to the security field.

Specifically, the signal transmission method in the present application can be applied to a place with security requirements, such as a shopping mall, a museum, a hospital, a home, a company, etc., and can implement functions such as intrusion detection and monitoring.

In a specific implementation, an algorithm can be designed to perform an alarm, an automatic alarm, and the like according to the result of human body detection. For example, after the museum is closed, no one will normally walk around the museum. If the signal transmission method in this application detects that a person is walking, an alarm can be issued to enable the relevant staff to check whether the museum is abnormal. .

The second scenario is applied to the smart home field.

Specifically, the signal transmission method in the present application can be applied to an intelligent control home, such as a smart switch air conditioner, an air conditioner temperature, a switch light, and the like.

In a specific implementation, an algorithm can be designed to intelligently control the home according to the results of human body detection. For example, in a home smart home, if the human body detection result indicates that a person enters the room, the air conditioner can be automatically turned on. If a certain number of people enter the room after a period of time, the temperature of the air conditioner can be automatically lowered. .

It can be understood that, not limited to the two application scenarios exemplified above, the signal transmission method of the present application can be applied to other fields, for example, in a scenario with complicated geographical environment, the method of the present application is implemented to detect whether someone is trapped. Etc., this application does not impose any restrictions on this.

Referring to FIG. 8, FIG. 8 is a functional block diagram of a first network device 800 provided by the present application. The first network device 800 may be implemented as the first network device in FIG. 3, FIG. 6, or FIG. The first network device 800 may include a receiving unit 801, a first determining unit 802, and a second determining unit 803, where

The receiving unit 801 is configured to receive the first test sequence; optionally, the first test sequence may be any one of an SRS sequence, a ZC sequence, or a customized sequence;

The first determining unit 802 is configured to determine channel state information according to the first test sequence;

The second determining unit 803 is configured to determine a human body detection result according to the channel state information.

In an optional embodiment, the second determining unit 803 may be specifically configured to extract feature values in the channel state information, perform pattern matching, and estimate at least one of the following: whether there is a person, a number of personnel, a personnel action, and a direction in which the person travels.

In an optional embodiment, the first test sequence is obtained by the transmission of the second test sequence sent by the sending device over the wireless channel, where the sending device may be the terminal device, the first network device or the second network device.

In an optional embodiment, where the sending device is the terminal device, the second test sequence is carried in the uplink time slot of the wireless subframe; and in the case that the sending device is the first network device, the second test sequence is carried in In the protection interval of the wireless subframe; in the case that the sending device is the second network device, the second test sequence is carried in at least one of an uplink time slot, a downlink time slot or a guard interval of the wireless subframe; wherein, the second The test sequence occupies at least one symbol.

In an optional embodiment, where the sending device is the first network device, the first network device further includes a third determining unit 804.

The third determining unit 804 is configured to determine, according to the environment information, at least one of: a location where the second test sequence is located, at least one transmit antenna, or at least one receive antenna; where the second test sequence is a guard interval of the wireless subframe The location at which at least one symbol of the second test sequence is carried; the second test sequence is transmitted by at least one transmit antenna, and the first test sequence is received by the at least one receive antenna.

In an optional embodiment, in the at least one transmitting antenna, the second test sequence sent by each transmitting antenna is located at a different location.

In an optional embodiment, among the at least one transmitting antenna, each transmitting antenna transmits the second test sequence using a different frequency band.

In an alternative embodiment, the human body detection results can be used for at least one of the following: intrusion detection, monitoring, intelligent control.

For a specific implementation of the respective functional units included in the first network device 800, reference may be made to the foregoing key technical points, or to the method embodiments corresponding to FIG. 3, FIG. 6, or FIG. 7, respectively, and details are not described herein again.

In addition, an embodiment of the present invention further provides a wireless communication system, and a specific implementation of the wireless communication system is described below.

In an alternative embodiment, the wireless communication system can include a first network device. The first network device may be the first network device in the method embodiment corresponding to FIG. 3, or may be the network device 20 shown in FIG. 2, or may be the first network device 800 shown in FIG.

In an alternative embodiment, the wireless communication system can include a first network device and a second network device. The first network device may be the first network device in the method embodiment corresponding to FIG. 6, or may be the network device 20 shown in FIG. 2, or may be the first network device 800 shown in FIG. The second network device may be the second network device in the method embodiment of FIG. 6.

In an alternative embodiment, the wireless communication system can include a first network device and a terminal device. The first network device may be the first network device in the method embodiment corresponding to FIG. 7, or may be the network device 20 shown in FIG. 2, or may be the first network device 800 shown in FIG. The terminal device may be the second network device in the method embodiment of FIG. 7.

For the specific implementation of the first network device, the second network device, and the terminal device, reference may be made to the foregoing key technical points, or the method embodiments corresponding to FIG. 3, FIG. 6, or FIG. 7 respectively, and details are not described herein again.

In summary, the implementation of the present application, the wireless sub-frame can be used to carry the second test sequence, the transmitting device sends the second test sequence, the first network device receives the first test sequence, and determines the channel state information, and the channel state information can determine the human body. Detection results. By implementing the present application, the human body detection function can be realized at a low cost by using existing equipment.

One of ordinary skill in the art can understand all or part of the process of implementing the above embodiments, which can be completed by a computer program to instruct related hardware, the program can be stored in a computer readable storage medium, when the program is executed The flow of the method embodiments as described above may be included. The foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.

Claims

A signal transmission method, comprising:

Receiving, by the first network device, a first test sequence;

Determining, by the first network device, channel state information according to the first test sequence;

The first network device determines a human body detection result according to the channel state information.
The method according to claim 1, wherein the first test sequence is obtained by transmission of a second test sequence sent by a transmitting device over a wireless channel, wherein the transmitting device is a terminal device, the first network Device or second network device.
The method of claim 2 wherein:

Where the sending device is the terminal device, the second test sequence is carried in an uplink time slot of a wireless subframe;

Where the sending device is the first network device, the second test sequence is carried in a guard interval of the wireless subframe;

In a case that the sending device is the second network device, the second test sequence is carried in at least one of an uplink time slot, a downlink time slot or a guard interval of the wireless subframe;

The second test sequence occupies at least one symbol.
The method according to claim 3, wherein, before the sending device is the first network device, before the sending, by the first network device, the second test sequence, the method further includes:

The first network device determines, according to the environment information, at least one of: a location where the second test sequence is located, at least one transmit antenna, or at least one receive antenna; where the second test sequence is located, the wireless subframe a location in which at least one symbol of the second test sequence is carried in the guard interval;

The second test sequence is transmitted by the at least one transmit antenna, and the first test sequence is received by the at least one receive antenna.
The method according to claim 4, wherein in the at least one transmitting antenna, the location of the second test sequence transmitted by each transmitting antenna is different.
The method according to any one of claims 4-5, wherein each of the at least one transmitting antenna transmits the second test sequence using a different frequency band.
The method according to any one of claims 1-6, wherein the determining, by the first network device, the human body detection result according to the channel state information, specifically includes:

The first network device extracts feature values in the channel state information, performs pattern matching, and estimates at least one of the following: whether there is a person, a number of personnel, a personnel action, and a direction in which the person travels.
The method according to any one of claims 1 to 7, wherein the first test sequence is any one of an SRS sequence, a ZC sequence, or a custom sequence.
The method according to any one of claims 1-8, wherein the human body detection result is used for at least one of the following: intrusion detection, monitoring, intelligent control.
A first network device, comprising: a receiving unit, a first determining unit, and a second determining unit, wherein

The receiving unit is configured to receive a first test sequence;

The first determining unit is configured to determine channel state information according to the first test sequence;

The second determining unit is configured to determine a human body detection result according to the channel state information.
The first network device of claim 10, wherein

The first test sequence is obtained by transmitting, by the sending device, a second test sequence, by using a wireless channel, where the sending device is a terminal device, the first network device, or a second network device.
The first network device of claim 11 wherein:

Where the sending device is the terminal device, the second test sequence is carried in an uplink time slot of a wireless subframe;

Where the sending device is the first network device, the second test sequence is carried in a guard interval of the wireless subframe;

In a case that the sending device is the second network device, the second test sequence is carried in at least one of an uplink time slot, a downlink time slot or a guard interval of the wireless subframe;

The second test sequence occupies at least one symbol.
The first network device according to claim 12, wherein, in a case where the sending device is a first network device, the first network device further includes a third determining unit;

The third determining unit is configured to determine, according to the environment information, at least one of: a location where the second test sequence is located, at least one transmit antenna, or at least one receive antenna; where the second test sequence is located Holding a position of at least one symbol of the second test sequence in a guard interval of the subframe;

The second test sequence is transmitted by the at least one transmit antenna, and the first test sequence is received by the at least one receive antenna.
The first network device according to claim 13, wherein in the at least one transmitting antenna, the second test sequence sent by each transmitting antenna is located at a different location.
The first network device according to any one of claims 13 to 14, wherein each of the at least one transmitting antenna transmits the second test sequence using a different frequency band.
The first network device according to any one of claims 10-15, wherein the second determining unit is specifically configured to extract feature values in the channel state information, perform pattern matching, and estimate at least one of: The number of people, the number of people, the movement of people, and the direction of personnel.
The first network device according to any one of claims 10-16, wherein the first test sequence is any one of an SRS sequence, a ZC sequence, or a customized sequence.
The first network device according to any one of claims 10-17, wherein the human body detection result is used for at least one of the following: intrusion detection, monitoring, and intelligent control.
A first network device, comprising: a receiver and a processor, wherein

The receiver is configured to receive a first test sequence;

The processor is configured to determine channel state information according to the first test sequence;

The processor is further configured to determine a human body detection result according to the channel state information.
The first network device according to claim 19, wherein the first test sequence is obtained by transmission of a second test sequence sent by the transmitting device over a wireless channel, wherein the transmitting device is a terminal device, the The first network device or the second network device.
The first network device according to claim 20, wherein, in a case where the sending device is the terminal device, the second test sequence is carried in an uplink time slot of a wireless subframe;

Where the sending device is the first network device, the second test sequence is carried in a guard interval of the wireless subframe;

In a case that the sending device is the second network device, the second test sequence is carried in at least one of an uplink time slot, a downlink time slot or a guard interval of the wireless subframe;

The second test sequence occupies at least one symbol.
The first network device according to claim 21, wherein, in a case where the sending device is a first network device, the processor is further configured to determine at least one of the following according to the environment information: a second test sequence a location, at least one transmit antenna, or at least one receive antenna; the second test sequence is located at a location in the guard interval of the wireless subframe that carries at least one symbol of the second test sequence;

The second test sequence is transmitted by the at least one transmit antenna, and the first test sequence is received by the at least one receive antenna.
The first network device according to claim 22, wherein in the at least one transmitting antenna, the second test sequence sent by each transmitting antenna is located at a different location.
The first network device according to any one of claims 22 or 23, wherein each of the at least one transmitting antenna transmits the second test sequence using a different frequency band.
The first network device according to any one of claims 19 to 24, wherein the processor is further configured to determine a human body detection result according to the channel state information, which specifically includes:

The processor is further configured to extract feature values in the channel state information, perform pattern matching, and estimate at least one of: whether there is a person, a number of personnel, a personnel action, and a direction in which the person travels.
The first network device according to any one of claims 19-25, wherein the first test sequence is any one of an SRS sequence, a ZC sequence, or a customized sequence.
The first network device according to any one of claims 19 to 26, wherein the human body detection result is used for at least one of the following: intrusion detection, monitoring, and intelligent control.
A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of claims 1-9.
A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of claims 1-9.