A perception method and system
By adopting an architecture based on fiber optic communication between master and slave devices in the RFID system, the self-interference problem in the single-antenna self-transmitting and self-receiving architecture is solved, achieving higher sensing sensitivity and security.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA MOBILE COMM LTD RES INST
- Filing Date
- 2024-11-29
- Publication Date
- 2026-05-29
AI Technical Summary
When an RFID reader adopts a single-antenna self-transmitting and self-receiving architecture, the transmission and reception signals are prone to strong self-interference, which reduces the sensitivity of sensing.
An architecture based on optical fiber is adopted for communication between master and slave devices. During the sensing process, the devices that send and receive signals are spatially separated, thus avoiding self-interference.
It improves the sensitivity and security of perception, and reduces the risk of data leakage.
Smart Images
Figure CN122120949A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communication technology, and in particular to a sensing method and system. Background Technology
[0002] In related technologies, radio frequency identification (RFID) readers are used to sense passive RFID tags. However, RFID readers adopt a single-antenna self-transmitting and self-receiving architecture, which is prone to strong self-interference when transmitting and receiving signals, thereby reducing the sensitivity of sensing. Summary of the Invention
[0003] To address the related technical issues, embodiments of this application provide a sensing method and system.
[0004] The technical solution of this application embodiment is implemented as follows:
[0005] This application provides a sensing method applied to a first system, the first system comprising: a master device and at least one slave device; the at least one slave device comprising: at least one first slave device, or at least one first slave device and at least one second slave device; the master device and each of the at least one slave device communicate via optical fiber; the method comprising:
[0006] The device first sends a first message to the first tag; the first message is used to sense the tag information of the first tag;
[0007] The master device or the second slave device receives a first response returned by the first tag based on the first message; the first response carries tag information of the first tag.
[0008] In the above scheme, before the first slave device sends the first message to the first tag, the method further includes:
[0009] The master device sends a second message to each of the at least one slave device, the second message being used to perform time and / or clock synchronization calibration on each slave device;
[0010] The master device receives a second response from each of the slave devices; the second response indicates that the corresponding slave device has completed clock synchronization calibration.
[0011] The method in the above scheme further includes:
[0012] If the second slave device receives the first response returned by the first tag, the second slave device forwards the first response to the master device.
[0013] In the above scheme, the first slave device sending a first message to the first tag includes:
[0014] Multiple slave devices send a first message to the first tag.
[0015] In the above scheme, before the first slave device sends the first message to the first tag, the method further includes:
[0016] The first device sends a third message to the first tag; the third message is used to activate the first tag.
[0017] The method in the above scheme further includes:
[0018] The main device locates and / or identifies the first tag based on the tag information of the first tag.
[0019] In the above scheme, before the first system initialization, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, the method further includes:
[0020] The master device designates from the at least one slave device: either the at least one first slave device, or the at least one first slave device and at least one second slave device.
[0021] In the above scheme, the master device designates from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device, including:
[0022] The master device designates, based on the positional distribution of the at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.
[0023] This application also provides a sensing system, including: a master device and at least one slave device; the at least one slave device includes: at least one first slave device, or at least one first slave device and at least one second slave device; the master device and each of the at least one slave device communicate via optical fiber; wherein...
[0024] The first slave device is configured to send a first message to the first tag; the first message is configured to sense tag information of the first tag;
[0025] The master device is configured to receive a first response returned by the first tag based on the first message; the first response carries tag information of the first tag; or,
[0026] The second slave device is configured to receive a first response returned by the first tag based on the first message.
[0027] In the above scheme, the main device is also used for:
[0028] Before the first slave device sends a first message to the first tag, a second message is sent to each of the at least one slave device, the second message being used to perform clock synchronization calibration on each of the slave devices; and...
[0029] Receive a second response from each of the slave devices; the second response is used to indicate that the corresponding slave device has completed time and / or clock synchronization calibration.
[0030] In the above scheme, the second slave device is further used for:
[0031] If the second slave device receives the first response returned by the first tag, it forwards the first response to the master device.
[0032] In the above scheme, the first slave device sending a first message to the first tag includes:
[0033] Multiple slave devices send a first message to the first tag.
[0034] In the above scheme, the first slave device is further used for:
[0035] Before the first slave device sends the first message to the first tag, a third message is sent to the first tag; the third message is used to activate the first tag.
[0036] In the above scheme, the main device is also used for:
[0037] Based on the tag information of the first tag, the first tag is located and / or identified.
[0038] In the above scheme, the main device is also used for:
[0039] Before the initialization of the sensing system, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, the at least one slave device is designated from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device.
[0040] In the above scheme, the master device designates from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device, including:
[0041] The master device designates, based on the positional distribution of the at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.
[0042] In this embodiment, the first system includes a master device and at least one slave device, wherein the at least one slave device includes at least one first slave device, or at least one first slave device and at least one second slave device; the master device and each of the at least one slave device communicate based on optical fiber; the sensing method executed by the first system includes: the first slave device sending a first message to a first tag, and then the master device or the second slave device receiving a first response returned by the first tag based on the first message, that is, the device sending the first message and the device receiving the first response are different devices; here, the first message is used to sense the tag information of the first tag, and the first response carries the tag information of the first tag. It can be seen that the first message can be regarded as a sensing signal in the sensing process, that is, the transmitting signal of the first system, and the first response can be regarded as a sensing response corresponding to the first message, that is, the receiving signal of the first system. Since the devices used to send the first message and receive the first response in this application are different devices, the transmitting and receiving signals in the sensing process will not interfere with each other in the same device. Compared with related technologies, it avoids strong self-interference of transmitting and receiving signals in the same device in the sensing process, thereby improving the sensitivity of sensing. Attached Figure Description
[0043] Figure 1 This is a timing diagram of a sensing scheme in related technologies;
[0044] Figure 2 This is a schematic diagram of a sensing scheme in related technologies;
[0045] Figure 3 A schematic diagram illustrating the implementation process of a sensing method provided in an embodiment of this application;
[0046] Figure 4 This application provides a schematic diagram of the architecture of a sensing system.
[0047] Figure 5 A schematic diagram of the architecture of a sensing system provided for an application embodiment of this application;
[0048] Figure 6 A timing diagram of a sensing method provided for an application embodiment of this application;
[0049] Figure 7 A schematic diagram of another sensing system architecture provided for an application embodiment of this application;
[0050] Figure 8 A timing diagram of another sensing method provided for an application embodiment of this application. Detailed Implementation
[0051] Indoor sensing technologies can be categorized into active and passive sensing technologies based on whether the tags require batteries. Active sensing technologies mainly include: active RFID sensing based on Received Signal Strength Indication (RSSI), Bluetooth (Beacon) sensing based on RSSI, Bluetooth Angle of Arrival (AOA) sensing, and Ultra-Wideband (UWB) sensing based on Time of Flight (TOF). Passive technologies, primarily passive RFID sensing, require energy harvesting technology to remotely power the tags. Table 1 compares these sensing technologies.
[0052] Table 1
[0053]
[0054]
[0055] It can be seen that active sensing technologies are generally limited by battery life, requiring regular battery replacements, and have high tag and maintenance costs. In contrast, passive sensing technologies use tags with extremely low cost, long lifespan, and ease of maintenance. Both valuable assets and low-cost materials can be managed using passive sensing technologies, making them more widely applicable.
[0056] Passive RFID systems in passive sensing technology mainly consist of an RFID reader (interrogator) and a passive RFID tag. The RFID reader, also known as a reader, is used to transmit radio frequency signals and receive and decode data reflected back from the passive RFID tag. The passive RFID tag, also known as a passive label or tag, is a small device used in practical applications to store data. It receives the radio frequency signals emitted by the reader and uses this energy to activate its own circuitry, sending the data stored on it back to the reader. The main area of the passive tag is occupied by the antenna, which encapsulates a chip. This chip integrates a modulator, oscillator, memory, digital logic, power management circuitry, and analog circuitry. The antenna in the tag is not only used for communication but also for harvesting energy to power the chip.
[0057] In practical applications, when a passive RFID system is working, the passive tag first collects the radio frequency energy transmitted by the reader through its antenna to activate the chip. Then, it decodes the reader's instructions. When it's the passive tag's turn to transmit data, the reader sends a continuous wave (CW). The passive tag modulates and reflects this continuous wave, and the reader decodes the reflected signal sent by the passive tag. This process repeats to complete communication. For example, Figure 1 A timing diagram for a passive RFID system is provided, wherein, according to ISO 18000-6C specifications for UHF passive RFID protocols, RN16 represents a 16-bit random number. See also Figure 1 When the reader initiates a query message, the passive tag that receives the query message is activated and responds with an RN16 response to indicate its presence, thus participating in the subsequent anti-collision process. Afterward, the reader sends an acknowledgment (Ack) message to query the passive tag's tag information. The passive tag returns protocol control information, Electronic Product Code (EPC) information, and Cyclic Redundancy Check (CRC) information. This completes one EPC code recognition process between the reader and the tag, that is, one round of perception process of the passive tag by the reader.
[0058] In related technologies, the reader / writer employs a single-antenna self-transmitting and self-receiving architecture, utilizing an internal RF circulator to separate the signals transmitted and received by the antenna. See also Figure 2 Since the isolation of radio frequency circulators is usually only about 20 dB, strong self-interference will occur between the strong signal sent by the reader and the weak signal returned by the passive tag, which will increase the internal noise level of the reader and reduce the sensitivity of sensing.
[0059] Based on this, in this embodiment of the application, the first system includes: a master device and at least one slave device; the at least one slave device includes: at least one first slave device, or at least one first slave device and at least one second slave device; the master device and each of the at least one slave device communicate based on optical fiber; the sensing method executed by the first system includes: the first slave device sending a first message to a first tag; wherein, the first message is used to sense tag information of the first tag; then, the master device or the second slave device receives a first response returned by the first tag based on the first message; the first response carries the tag information of the first tag. That is, during the sensing process, the device that sends the first message to the first tag and the device that receives the first response returned by the first tag based on the first message are different devices. Compared with related technologies, this avoids strong self-interference of the transmitting and receiving signals within the same device during the sensing process, thereby improving the sensitivity of the sensing.
[0060] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.
[0061] This application provides a sensing method applied to a first system.
[0062] The first system includes: a master device and at least one slave device; the at least one slave device includes: at least one first slave device, or at least one first slave device and at least one second slave device; the master device communicates with each of the at least one slave device based on optical fiber.
[0063] In practical applications, the master device and each slave device in the first system are different devices, spatially separated from each other. The first system can be understood as a sensing system or a reader / writer. Specifically, the first system can sense passive tags by sending sensing signals to passive tags and receiving response signals returned by the passive tags based on the sensing signals.
[0064] In practical applications, the first system can be networked with one master device and at least one slave device based on a Fiber to the Room (FTTR) architecture, with fiber optic cables connecting the master and slave devices to various rooms within the building. The master device is equivalent to the Main FTTR Unit (MFU) in the FTTR architecture, and the slave device is equivalent to the Sub FTTR Unit (SFU). In this way, all sensing devices in the first system are located indoors, making it less likely for data exchanged during sensing to leak outdoors, thus improving the security of the sensing process.
[0065] See Figure 3 The sensing method provided in this application includes:
[0066] Step 301: The first slave device sends a first message to the first tag.
[0067] The first message is used to perceive the tag information of the first tag.
[0068] In practical applications, the first message can be understood as a sensing signal sent by the first system. For example, the first message can be an Ack message. The first slave device can send the sensing signal to the first tag based on air interface communication technology.
[0069] In practical applications, the first tag can be understood as the tag sensed by the first system. For example, the first tag can be a passive RFID tag. After receiving the first message, the first tag can return a sensing response to the master device or the second slave device based on the first message. This sensing response carries the tag information of the first tag. For example, the tag information may include protocol control information, EPC code, and CRC information, etc.
[0070] In practical applications, the first message can be sent from one first slave device to the first tag, or multiple first slave devices can send the first message to the first tag.
[0071] In one embodiment, the first slave device sends a first message to the first tag, including:
[0072] Multiple slave devices send a first message to the first tag.
[0073] In practical applications, multiple slave devices can simultaneously send the first message to the first tag, thereby increasing the sensing range and improving the sensing sensitivity.
[0074] In practical applications, the master device can first send a first instruction to the first slave device, and then the first slave device sends a first message to the first tag based on the first instruction; the first instruction can be a signal used to trigger the first slave device to send the first message.
[0075] Step 302: The master device or the second slave device receives the first response returned by the first tag based on the first message.
[0076] The first response carries the tag information of the first tag.
[0077] In practical applications, the first response can be understood as the sensing response returned by the first tag based on the first message. The first tag can return a sensing response to the master device or the second slave device based on air interface communication technology. After receiving the first response, the master device or the second slave device can then obtain the tag information of the first tag carried in the first response. The master device or the second slave device obtaining the tag information can be understood as the first system obtaining the tag information.
[0078] In practical applications, the first system can perform multiple rounds of perception on the first tag. Each time the first system obtains the tag information of the first tag, it can be regarded as the first system performing one round of perception on the first tag.
[0079] It should be noted that when multiple slave devices send the first message to the first tag at the same time, the master device or the second slave device may receive multiple first responses corresponding to these first messages within a short time threshold. In this case, the tag information obtained by the master device or the second slave device based on these multiple first responses can be regarded as the master device or the second slave device obtaining tag information once, that is, the first system has performed one round of perception.
[0080] In each round of perception, the first system can perceive the first label based on the following two methods:
[0081] Method 1: The first slave device sends a first message to the first tag, and then the master device receives the first response returned by the first tag based on the first message.
[0082] Method 2: The first slave device sends a first message to the first tag, and then the second slave device receives the first response returned by the first tag based on the first message.
[0083] As can be seen, in the two methods described above, the device that sends the first message and the device that receives the first response are different devices. In other words, in this embodiment of the application, the device that sends the sensing signal and the device that receives the sensing response are spatially separated. Thus, compared with related technologies, strong self-interference between the transmitting and receiving signals in the same device during the sensing process is avoided, thereby improving the sensitivity of sensing.
[0084] In one embodiment, the sensing method provided in this application further includes:
[0085] If the second slave device receives the first response returned by the first tag, the second slave device forwards the first response to the master device.
[0086] In practical applications, communication between the slave and master devices is based on optical fiber. Therefore, the second slave device can forward the first response to the master device via optical fiber. It is understandable that optical fiber has a large bandwidth and high transmission rate; therefore, the second slave device forwarding the first response to the master device via optical fiber ensures low transmission latency and allows for a large amount of data to be uploaded within a set time, thus ensuring that the second slave device can upload large amounts of tag information to the master device in real time.
[0087] Understandably, even if the second slave device receives the first response from the first tag, the master device can still receive the first response through the forwarding of the second slave device, and thus obtain the tag information carried in the first response. Therefore, regardless of whether the master device receives the first response from the first tag or the second slave device receives the first response from the first tag, the master device can obtain the tag information of the first tag. After receiving the tag information of the first tag, the master device can store the tag information locally and perform further analysis based on the tag information.
[0088] In one embodiment, the sensing method provided in this application further includes:
[0089] The main device locates and / or identifies the first tag based on the tag information of the first tag.
[0090] In practical applications, the first system can perform multiple rounds of sensing on the first tag. After each round of sensing, the main device can perform positioning and / or identification based on the acquired tag information. The main device can also perform positioning and / or identification based on the acquired tag information after multiple rounds of sensing.
[0091] In practical applications, both the first slave device and the second slave device are slave devices. The master device can designate the first slave device and the second slave device from at least one slave device. Specifically, at least one first slave device can be designated from at least one slave device, or at least one first slave device and at least one second slave device can be designated. Based on this,
[0092] In one embodiment, before the first system initialization, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, the sensing method provided in this application embodiment further includes:
[0093] The master device designates from at least one slave device: at least one first slave device, or at least one first slave device and at least one second slave device.
[0094] In practical applications, the first round of sensing will only begin after the first system has been initialized. The master device can designate the first and second slave devices before the first round of sensing.
[0095] In practical applications, after the second slave device receives the first response returned by the first tag based on the first message, the first system can end one round of sensing and begin the next round of sensing. The master device can designate the first and second slave devices after one round of sensing ends and before the next round of sensing begins. The master device can also designate the first and second slave devices after each round of sensing ends and before the next round of sensing begins.
[0096] In one embodiment, the master device designates from at least one slave device: at least one first slave device, or at least one first slave device and at least one second slave device, including:
[0097] The master device designates, based on the positional distribution of at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.
[0098] In practical applications, the positional distribution of at least one slave device relative to the first tag can be: the distance between at least one slave device and the first tag. This distance does not have to be quantitative information. For example, the positional distribution can be: slave device 1 of at least one slave device is closest to the first tag. The positional distribution can also be: the distance between at least one slave device and the first tag. This distance can be a specific numerical value.
[0099] In practical applications, the master device can determine the positional distribution of the slave devices relative to the first tag based on the equipment configuration provided by the user; the master device can also determine the positional distribution of the slave devices relative to the first tag based on the positioning results of the first tag determined in the previous round of sensing.
[0100] In practical applications, the master device can designate the slave device closest to the first tag among at least one slave device as the second slave device, and then designate the other slave devices besides the second slave device as the first slave device.
[0101] The following section provides further details on the scheme prior to the first slave device sending the first message.
[0102] In one embodiment, before the first slave device sends the first message to the first tag, the sensing method provided in this application further includes:
[0103] The first device sends a third message to the first tag.
[0104] The third message is used to activate the first tag.
[0105] In practical applications, the third message can be understood as a sensing signal sent by the first system. For example, the third message can be a query message.
[0106] It should be noted that both the first message and the third message can be understood as a sensing signal sent by the first system, but the first message is used to sense tag information, while the third message is used to activate the first tag. The first message and the third message are different messages.
[0107] In practical applications, after receiving the third message, the first tag can return a third response to the master device or the second slave device. The third response can be understood as the sensing response returned by the first tag based on the third message. For example, the third response can be an RN16 response. Thus, the devices sending the third message and receiving the third response are different devices in the first system, further ensuring spatial separation between the device sending the sensing signal and the device receiving the sensing response. Compared to related technologies, this avoids strong self-interference caused by the transmission and reception signals within the same device during the sensing process, further improving the sensitivity of the sensing.
[0108] In practical applications, multiple first slave devices can simultaneously send third messages to the first tag, that is, simultaneously activate the first tag, thereby increasing the range of perception and improving the sensitivity of perception.
[0109] In practical applications, the master device can first send a second instruction to the second slave device, and then the second slave device sends a third message to the first tag based on the second instruction; the second instruction can be a signal used to trigger the second slave device to send the third message.
[0110] In practical applications, when the second slave device receives a third response returned by the first tag, the second slave device can forward the third response to the master device.
[0111] In one embodiment, before the first slave device sends the first message to the first tag, the sensing method provided in this application further includes:
[0112] The master device sends a second message to each of the at least one slave device, the second message being used to perform time and / or clock synchronization calibration on each slave device;
[0113] The master device receives a second response from each slave device; the second response indicates that the corresponding slave device has completed clock synchronization calibration.
[0114] In practical applications, the master device can send a second message to each of at least one slave device before the first slave device sends a third message to the first tag, thereby performing time and / or clock synchronization calibration. Time synchronization calibration can be used to ensure that each slave device in the first system operates based on the same time reference, and clock synchronization calibration can be used to ensure that each slave device in the first system operates based on the same frequency reference, thereby improving the accuracy of sensing by the first system.
[0115] In this embodiment of the application, during the sensing process, the device that sends the first message to the first tag and the device that receives the first response returned by the first tag based on the first message are different devices. Compared with related technologies, this avoids strong self-interference between the transmitting and receiving signals in the same device during the sensing process, thereby improving the sensitivity of sensing.
[0116] Based on the sensing methods in the above embodiments, this application also provides a sensing system.
[0117] See Figure 4 The system includes: a master device and at least one slave device.
[0118] The at least one slave device includes: at least one first slave device, or at least one first slave device and at least one second slave device; the master device communicates with each of the at least one slave device based on optical fiber.
[0119] The first slave device is used to send a first message to the first tag; the first message is used to sense the tag information of the first tag.
[0120] The master device is configured to receive a first response returned by the first tag based on the first message; the first response carries tag information of the first tag; or,
[0121] The second slave device is used to receive a first response returned by the first tag based on the first message.
[0122] In practical applications, the master device and each slave device in a sensing system are different devices, separated from each other in space. A sensing system can be understood as a kind of reader / writer.
[0123] In practical applications, the sensing system can be networked based on an FTTR architecture, consisting of a master device and at least one slave device. The master and slave devices are then connected to various rooms within the building via fiber optic cables. The master device is equivalent to the MFU (Master Unit) in the FTTR architecture, and the slave device is equivalent to the SFU (Slave Unit). This ensures that all sensing devices are located indoors, reducing the likelihood of data leakage during sensing processes and enhancing security.
[0124] In practical applications, the sensing system can be configured with master and slave devices based on the following two architectures. It should be noted that architecture 1 and architecture 2 are used to describe the signal transmission and reception methods of the master and slave devices, and can be combined with the fiber optic networking method represented by the FTTR architecture.
[0125] Architecture 1: The first slave device is used to send sensing signals to the first tag, and the master device is used to receive the sensing response sent by the first tag based on the sensing signals.
[0126] In practical applications, architecture 1 can also be described as a master-receiver-slave-transmitter architecture.
[0127] Architecture 2: The first slave device is used to send a sensing signal to the first tag, and the second slave device is used to receive the sensing response sent by the first tag based on the sensing signal.
[0128] In practical applications, architecture 2 can also be described as a send-and-receive architecture.
[0129] As can be seen, in the two architectures described above, the device that sends the sensing signal and the device that receives the sensing response are different devices. In other words, in this embodiment of the application, the device that sends the sensing signal and the device that receives the sensing response in the sensing system are spatially separated. Therefore, the sensing signal and the sensing response will not interfere with each other in the same device. That is, the transmitting and receiving signals in the sensing system will not interfere with each other in the same device.
[0130] In practical applications, the first slave device can send sensing signals to the first tag based on air interface communication technology, and the first tag can return sensing responses to the master device or the second slave device based on air interface communication technology.
[0131] In practical applications, the first message can be understood as a sensing signal; for example, the first message can be an Ack message. The first tag can be understood as a tag used by the sensing system for sensing; for example, the first tag can be a passive RFID tag. After receiving the first message, the first tag can return a sensing response to the master device or the second slave device based on the first message. This sensing response carries the tag information of the first tag. After receiving the first response, the master device or the second slave device can then obtain the tag information of the first tag carried in the first response. For example, the tag information of the first tag may include protocol control information, EPC code, and CRC information, etc.
[0132] In practical applications, the first message can be sent from one first slave device to the first tag, or multiple first slave devices can send the first message to the first tag.
[0133] In one embodiment, the first slave device sends a first message to the first tag, including:
[0134] Multiple slave devices send a first message to the first tag.
[0135] In practical applications, multiple slave devices can simultaneously send first messages to the first tag, thereby increasing the sensing range and improving sensing sensitivity. In this embodiment, the device sending the sensing signal and the device receiving the sensing response are spatially separated in the sensing system. This avoids strong self-interference between the transmitting and receiving signals within the same device during the sensing process, compared to related technologies, thus improving sensing sensitivity.
[0136] In one embodiment, the second slave device is further configured to:
[0137] Upon receiving the first response from the first tag from the second slave device, the first response is forwarded to the master device.
[0138] In practical applications, communication between the slave and master devices is based on optical fiber. Therefore, the second slave device can forward the first response to the master device via optical fiber. It is understandable that optical fiber has a large bandwidth and high transmission rate; therefore, the second slave device forwarding the first response to the master device via optical fiber ensures low transmission latency and allows for a large amount of data to be uploaded within a set time, thus ensuring that the second slave device can upload large amounts of tag information to the master device in real time.
[0139] Understandably, even if the second slave device receives the first response from the first tag, the master device can still receive the first response through the forwarding of the second slave device, and thus obtain the tag information carried in the first response. Therefore, regardless of whether the master device receives the first response from the first tag or the second slave device receives the first response from the first tag, the master device can obtain the tag information of the first tag. After receiving the tag information of the first tag, the master device can store the tag information locally and perform further analysis based on the tag information.
[0140] In one embodiment, the master device is further configured to:
[0141] Based on the tag information of the first tag, the first tag is located and / or identified.
[0142] In practical applications, the sensing system can perform multiple rounds of sensing on the first tag. After each round of sensing, the main device can perform positioning and / or identification based on the acquired tag information. The main device can also perform positioning and / or identification based on the acquired tag information after multiple rounds of sensing.
[0143] In practical applications, both the first slave device and the second slave device are slave devices. The master device can designate the first slave device and the second slave device from at least one slave device. Specifically, at least one first slave device can be designated from at least one slave device, or at least one first slave device and at least one second slave device can be designated. Based on this,
[0144] In one embodiment, the master device is further configured to:
[0145] Before the sensing system is initialized, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, at least one slave device is specified from at least one slave device: at least one first slave device, or at least one first slave device and at least one second slave device.
[0146] In practical applications, the first round of sensing will only begin after the sensing system has been initialized. The master device can designate the first and second slave devices before the first round of sensing.
[0147] In practical applications, after the second slave device receives the first response returned by the first tag based on the first message, the sensing system can end one round of sensing and begin the next round. The master device can designate the first and second slave devices after one round of sensing ends and before the next round of sensing begins. The master device can also designate the first and second slave devices after each round of sensing ends and before the next round of sensing begins.
[0148] In one embodiment, the master device designates from at least one slave device: at least one first slave device, or at least one first slave device and at least one second slave device, including:
[0149] The master device designates, based on the positional distribution of at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.
[0150] In practical applications, the positional distribution of at least one slave device relative to the first tag can be: the distance between at least one slave device and the first tag. This distance does not have to be quantitative information. For example, the positional distribution can be: slave device 1 of at least one slave device is closest to the first tag. The positional distribution can also be: the distance between at least one slave device and the first tag. This distance can be a specific numerical value.
[0151] In practical applications, the master device can determine the positional distribution of the slave devices relative to the first tag based on the equipment configuration provided by the user; the master device can also determine the positional distribution of the slave devices relative to the first tag based on the positioning results of the first tag determined in the previous round of sensing.
[0152] In practical applications, the master device can designate the slave device closest to the first tag among at least one slave device as the second slave device, and then designate the other slave devices besides the second slave device as the first slave device.
[0153] In one embodiment, the first slave device is further configured to:
[0154] Before the first slave device sends the first message to the first tag, a third message is sent to the first tag; the third message is used to activate the first tag.
[0155] In practical applications, a third message can be understood as a sensing signal sent by the sensing system. For example, a third message can be a query message.
[0156] It should be noted that both the first message and the third message can be understood as a sensing signal sent by the sensing system, but the first message is used to sense tag information, while the third message is used to activate the first tag. The first message and the third message are different messages.
[0157] In practical applications, after receiving the third message, the first tag can return a third response to the master device or the second slave device. The third response can be understood as the sensing response returned by the first tag based on the third message. For example, the third response can be an RN16 response. Thus, the devices sending the third message and receiving the third response are different devices in the sensing system, further ensuring spatial separation between the device sending the sensing signal and the device receiving the sensing response. Compared to related technologies, this avoids strong self-interference caused by the transmission and reception signals within the same device during the sensing process, further improving the sensitivity of the sensing.
[0158] In practical applications, multiple first slave devices can simultaneously send third messages to the first tag, that is, simultaneously activate the first tag, thereby increasing the range of perception and improving the sensitivity of perception.
[0159] In practical applications, the master device can first send a second instruction to the second slave device, and then the second slave device sends a third message to the first tag based on the second instruction; the second instruction can be a signal used to trigger the second slave device to send the third message.
[0160] In practical applications, when the second slave device receives a third response returned by the first tag, the second slave device can forward the third response to the master device.
[0161] In one embodiment, the master device is further configured to:
[0162] Before the first slave device sends a first message to the first tag, a second message is sent to each of the at least one slave device, the second message being used to perform clock synchronization calibration on each slave device; and,
[0163] Receive a second response from each slave device; the second response is used to indicate that the corresponding slave device has completed time and / or clock synchronization calibration.
[0164] In practical applications, the master device can send a second message to each of at least one slave device before the first slave device sends a third message to the first tag, thereby performing time and / or clock synchronization calibration. Time synchronization calibration can be used to ensure that each slave device in the sensing system operates based on the same time reference, and clock synchronization calibration can be used to ensure that each slave device in the sensing system operates based on the same frequency reference, thereby improving the accuracy of the sensing system.
[0165] The following provides an application example in conjunction with any of the above embodiments.
[0166] This application provides a sensing system comprising: one MFU and multiple SFUs, wherein the MFU and SFUs are networked based on an FTTR architecture, that is, the MFU and each SFU are connected by optical fiber.
[0167] The perception system provided in this application embodiment can be configured with MFU and SFU based on the following architecture.
[0168] Master-receiver-slave architecture: See Figure 5 The SFU (Sensing Unit) is used to send sensing signals to passive RFID tags, and the MFU (Medium-Level Unit) is used to receive the sensing response returned by the passive RFID tags based on the sensing signals. The SFU is equipped with a transmitting antenna (TX), and the MFU is equipped with a receiving antenna (RX).
[0169] See Figure 6 The interaction process of the perception system based on the master-receiver-slave architecture mainly includes the following steps:
[0170] Step 1: The MFU performs time and clock synchronization calibration on multiple SFUs.
[0171] Step 2: The SFU sends a Query message to the passive RFID tag to activate it.
[0172] In practical applications, the MFU can instruct the SFU to send a Query message.
[0173] Step 3: After the passive RFID tag is activated, it returns an RN16 response to the MFU.
[0174] Step 4: The SFU sends an Ack message to the passive RFID tag.
[0175] In practical applications, the MFU can instruct the SFU to send an Ack message.
[0176] Step 5: The passive RFID tag returns tag information to the MFU.
[0177] For example, the tag information may include: PC / XPC protocol control information, EPC code, and CRC information.
[0178] Receive-and-send architecture: See Figure 7 The SFU (Sensing Unit) is used to send sensing signals to passive RFID tags and receive sensing responses from passive RFID tags based on these signals. The SFU that sends sensing signals to the passive RFID tags and the SFU that receives sensing responses are different SFUs. The SFU that sends sensing signals is equipped with a TX (Transmission Module), and the SFU that receives sensing responses is equipped with an RX (Reception Module).
[0179] See Figure 8The interaction process of a perception system based on a transmit-receive architecture mainly includes the following steps:
[0180] Step 1: The MFU performs time and clock synchronization calibration on multiple SFUs.
[0181] Step 2: The SFU sends a Query message to the passive RFID tag to activate it.
[0182] In practical applications, the MFU can instruct the SFU to send a Query message.
[0183] Step 3: After the passive RFID tag is activated, it returns an RN16 response to the SFU.
[0184] Step 4: The SFU that received the RN16 response returns the RN16 response to the MFU.
[0185] Step 5: The SFU sends an Ack message to the passive RFID tag.
[0186] In practical applications, the MFU can instruct the SFU to send an Ack message. The Ack message is equivalent to the first message in the embodiments of this application.
[0187] Step 6: The passive RFID tag returns tag information to the SFU.
[0188] For example, the tag information may include: PC / XPC protocol control information, EPC code, and CRC information.
[0189] Step 7: The SFU that receives the tag information returns the tag information to the MFU.
[0190] It should be noted that in the above steps, the SFU for sending the Query message and the Ack message is the same, and the SFU for receiving the RN16 response and the tag information is the same, but the SFU for sending the Query message and the Ack message is different from the SFU for receiving the RN16 response and the tag information.
[0191] In the application embodiments of this application, the device that sends the sensing signal and the device that receives the sensing response are spatially separated in the sensing system. In this way, compared with related technologies, strong self-interference caused by the transmission and reception of signals in the same device during the sensing process is avoided, thereby improving the sensitivity of sensing.
[0192] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0193] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the term "at least one" in this document means any combination of at least two of any one or more of a plurality of elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.
[0194] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.
[0195] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application.
Claims
1. A sensing method, characterized in that, The method is applied to a first system, the first system comprising: a master device and at least one slave device; the at least one slave device comprising: at least one first slave device, or at least one first slave device and at least one second slave device; the master device and each of the at least one slave device communicate via optical fiber; the method comprises: The device first sends a first message to the first tag; the first message is used to sense the tag information of the first tag; The master device or the second slave device receives a first response returned by the first tag based on the first message; the first response carries tag information of the first tag.
2. The method according to claim 1, characterized in that, Before the first slave device sends the first message to the first tag, the method further includes: The master device sends a second message to each of the at least one slave device, the second message being used to perform time and / or clock synchronization calibration on each slave device; The master device receives a second response from each of the slave devices; the second response indicates that the corresponding slave device has completed clock synchronization calibration.
3. The method according to claim 1, characterized in that, The method further includes: If the second slave device receives the first response returned by the first tag, the second slave device forwards the first response to the master device.
4. The method according to claim 1, characterized in that, The first slave device sends a first message to the first tag, including: Multiple slave devices send a first message to the first tag.
5. The method according to claim 1, characterized in that, Before the first slave device sends the first message to the first tag, the method further includes: The first device sends a third message to the first tag; the third message is used to activate the first tag.
6. The method according to claim 1, characterized in that, The method further includes: The main device locates and / or identifies the first tag based on the tag information of the first tag.
7. The method according to claim 1, characterized in that, Before the first system initialization, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, the method further includes: The master device designates from the at least one slave device: either the at least one first slave device, or the at least one first slave device and at least one second slave device.
8. The method according to claim 7, characterized in that, The master device designates from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device, including: The master device designates, based on the positional distribution of the at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.
9. A sensing system, characterized in that, include: One master device and at least one slave device; The at least one slave device includes: at least one first slave device, or at least one first slave device and at least one second slave device; the master device communicates with each of the at least one slave device via optical fiber; wherein... The first slave device is configured to send a first message to the first tag; the first message is configured to sense tag information of the first tag; The master device is configured to receive a first response returned by the first tag based on the first message; the first response carries tag information of the first tag; or, The second slave device is configured to receive a first response returned by the first tag based on the first message.
10. The system according to claim 9, characterized in that, The main device is also used for: Before the first slave device sends a first message to the first tag, a second message is sent to each of the at least one slave device, the second message being used to perform clock synchronization calibration on each of the slave devices; as well as, Receive a second response returned by each of the aforementioned slave devices; The second response is used to indicate that the corresponding slave device has completed time and / or clock synchronization calibration.
11. The system according to claim 9, characterized in that, The second slave device is also used for: If the second slave device receives the first response returned by the first tag, it forwards the first response to the master device.
12. The system according to claim 9, characterized in that, The first slave device sends a first message to the first tag, including: Multiple slave devices send a first message to the first tag.
13. The system according to claim 9, characterized in that, The first slave device is also used for: Before the first slave device sends the first message to the first tag, a third message is sent to the first tag; the third message is used to activate the first tag.
14. The system according to claim 9, characterized in that, The main device is also used for: Based on the tag information of the first tag, the first tag is located and / or identified.
15. The method according to claim 9, characterized in that, The main device is also used for: Before the initialization of the sensing system, and / or after the master device or the second slave device receives the first response returned by the first tag based on the first message, the at least one slave device is designated from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device.
16. The method according to claim 15, characterized in that, The master device designates from the at least one slave device: the at least one first slave device, or the at least one first slave device and at least one second slave device, including: The master device designates, based on the positional distribution of the at least one slave device relative to the first tag, at least one first slave device, or at least one first slave device and at least one second slave device.