Information transmission method, device and equipment

Abstract

Disclosed are an information transmission method, apparatus and device, belonging to the technical field of communications, the information transmission method of the embodiment of the present application is applied to a first node, the method comprising: the first node sending indication information to a second node or a BSC device, the indication information is used for indicating parameter information of at least one of the first signal and the second signal, and the parameter information comprises at least one of signal rate information and a demodulation reference signal (DMRS) pattern; wherein the first signal is a signal sent to the second node by the first node, the second signal is a signal sent to the second node by the BSC device through a backscattering technology, and an excitation signal of the second signal is sent by the first node.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to an information transmission method, device and equipment. Background Art

[0002] Backscatter communication (BSC) equipment can enhance the signal sent by the first node while sending the signal to carry its own information through backscatter technology, thereby assisting the direct link communication between the first node and the second node.

[0003] However, when the BSC device loads its own information on the carrier signal, it will cause signal instability. It is necessary to insert a demodulation reference signal (DMRS) into the signal sent by the first node and the BSC device to assist demodulation, but too much DMRS will lead to higher additional overhead, thereby reducing communication efficiency. Summary of the invention

[0004] The embodiments of the present application provide an information transmission method, apparatus and device, which can reduce DMRS overhead.

[0005] In a first aspect, a method for transmitting information is provided, the method comprising:

[0006] The first node sends indication information to the second node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0007] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0008] In a second aspect, an information transmission method is provided, the method comprising:

[0009] The second node sends indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0010] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0011] In a third aspect, a method for information transmission is provided, the method comprising:

[0012] The BSC device receives indication information sent by the first node or the second node, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0013] In a fourth aspect, an information transmission device is provided, which is applied to a first node, and the device includes:

[0014] A first sending module is used to send indication information to the second node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0015] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0016] In a fifth aspect, an information transmission device is provided, which is applied to a second node, and the device includes:

[0017] A second sending module is used to send indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0018] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0019] In a sixth aspect, an information transmission device is provided, which is applied to a BSC device, and the device includes:

[0020] The first receiving module is used to receive indication information sent by the first node or the second node, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0021] In the seventh aspect, a communication device is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and the program or instruction, when executed by the processor, implements the steps of the information transmission method as described in the first aspect, or implements the steps of the information transmission method as described in the second aspect, or implements the steps of the information transmission method as described in the third aspect.

[0022] In an eighth aspect, a communication system is provided, comprising a first node, a second node and a BSC device, wherein the first node can be used to execute the steps of the information transmission method described in the first aspect, the second node can be used to execute the steps of the information transmission method described in the second aspect, and the third node can be used to execute the steps of the information transmission method described in the third aspect.

[0023] In the embodiment of the present application, by indicating the signal rate information and the demodulation reference signal DMRS pattern, the number of DMRS required to be inserted into the appropriate first signal and the second signal can be indicated, thereby reducing the DMRS overhead and improving the communication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0025] Figure 2 is a schematic diagram of a single-base backscatter communication system in an embodiment of the present application;

[0026] Figure 3 is a schematic diagram of a dual-base backscatter communication system in an embodiment of the present application;

[0027] Figure 4 is a schematic diagram of a backscatter communication architecture in an embodiment of the present application;

[0028] Figure 5 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0029] Figure 6 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0030] Figure 7 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0031] Figure 8 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0032] Fig. 9 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0033] Fig.10 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0034] Fig.11 is a schematic diagram of another backscatter communication architecture in an embodiment of the present application;

[0035] Fig.12 is a schematic diagram of information transmission of a symbiotic communication system in an embodiment of the present application;

[0036] Fig.13 is a schematic diagram of a main link signal pattern in the related art;

[0037] Fig.14 is a schematic diagram of a secondary link signal pattern in the related art;

[0038] Fig.15 is a flow chart of an information transmission method in an embodiment of the present application;

[0039] Fig.16 is a schematic diagram of a symbiotic communication system in an embodiment of the present application;

[0040] Fig.17 is a schematic diagram of a main link signal pattern in an embodiment of the present application;

[0041] Fig.18 is a schematic diagram of a secondary link signal pattern in an embodiment of the present application;

[0042] Fig.19 is a schematic diagram of another main link signal pattern in an embodiment of the present application;

[0043] Fig. 20 is a schematic diagram of another secondary link signal pattern in an embodiment of the present application;

[0044] Fig.21 is a schematic diagram of another secondary link signal pattern in an embodiment of the present application;

[0045] Fig. 22 is a schematic diagram of another secondary link signal pattern in an embodiment of the present application;

[0046] Fig.23 is a flow chart of another information transmission method in an embodiment of the present application;

[0047] Fig.24 is a flow chart of another information transmission method in an embodiment of the present application;

[0048] Fig.25 is a structural schematic diagram of an information transmission device in an embodiment of the present application;

[0049] Fig.26 is a schematic structural diagram of another information transmission device in an embodiment of the present application;

[0050] Fig. 27 is a schematic structural diagram of another information transmission device in an embodiment of the present application;

[0051] Fig.28 is a structural diagram of a communication device in an embodiment of the present application;

[0052] Fig.29 is a schematic diagram of the hardware structure of a terminal in an embodiment of the present application;

[0053] Fig.30 It is a schematic diagram of the hardware structure of a network side device in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0055] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0056] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0057] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0058] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AS) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0059] To facilitate understanding of the technical solutions provided by the present application, the main technical concepts involved in the embodiments of the present application are briefly described below.

[0060] 1. Backscatter Communication

[0061] Backscatter communication refers to the backscatter communication device (i.e. BSC device) using the radio frequency signal from other devices or the environment to modulate the signal to transmit its own information. The BSC device can be any of the following:

[0062] The BSC device in the traditional Radio Frequency Identification (RFID) is generally a tag (such as a radio frequency card) and belongs to the Passive Internet of Things (Passive-IoT) device;

[0063] Semi-passive tags, which have a certain amplification capability for downlink reception or uplink reflection;

[0064] Tags with active sending capabilities (also called Active Tags) can send information to a reader without relying on reflection of the incident signal.

[0065] A simple implementation of backscatter communication is: when the tag needs to send '1', the tag reflects the incident carrier signal, and when the tag needs to send '0', it does not reflect.

[0066] Backscatter communication equipment controls the reflection coefficient Γ of the circuit by adjusting its internal impedance, thereby changing the amplitude, frequency, phase, etc. of the incident signal to achieve signal modulation. The reflection coefficient of the signal can be characterized as:

[0067]

[0068] Among them, Z 0 is the antenna characteristic impedance, Z 1 is the load impedance. Assume that the incident signal is S in (t), the output signal is Therefore, corresponding amplitude modulation, frequency modulation or phase modulation can be achieved by properly controlling the reflection coefficient Γ.

[0069] The typical backscatter communication architecture can be divided into monostatic system and bistatic system:

[0070] 1. Single-base system (single-base backscatter communication system)

[0071] A typical representative of a single-base backscatter communication system is a traditional RFID system, such as Figure 2 FIG. 1 is a schematic diagram of a single-base backscatter communication system, which includes a BSC device (such as a Tag) and a reader / writer.

[0072] The reader / writer includes a radio frequency source and a BSC receiver. The radio frequency source is used to generate a radio frequency signal (usually a continuous carrier) to power the BSC device and provide a carrier. The BSC device modulates and backscatters the continuous carrier. The BSC receiver in the reader / writer receives the backscattered signal and then demodulates the signal.

[0073] Since the RF source and the BSC receiver are in the same device, such as Figure 2 The reader / writer shown is therefore called a single-base backscatter communication system. In this system, since the RF signal sent from the BSC device will undergo a double near-far effect due to the signal attenuation of the round-trip signal, the signal energy attenuation is large, so the single-base system is generally used for short-distance backscatter communication, such as traditional RFID applications.

[0074] 2. Dual-base system (dual-base backscatter communication system)

[0075] Unlike single-base systems, such as Figure 3As shown, the RF source and the BSC receiving end in the dual-base system are separated. Therefore, the dual-base system avoids the problem of large round-trip signal attenuation. In addition, the performance of the backscatter communication system can be further improved by properly placing the RF source.

[0076] 2. Backscatter Communication System in Cellular Network

[0077] In cellular networking, the backscatter communication system can be specifically divided into eight architectures as shown in Table 1 based on different settings of the RF source, uplink, and downlink.

[0078] Architecture Downlink Uplink RF source provider 1 Base station->BSC equipment BSC equipment -> base station Base Station 2 Base station->BSC equipment BSC equipment -> relay equipment -> base station Base Station 3-1a Base station->BSC equipment BSC equipment -> terminal -> base station Base Station 3-1b Base station->BSC equipment BSC equipment -> terminal -> base station terminal 3-2a Base station->Terminal->BSC equipment BSC equipment -> base station Base Station 3-2b Base station->Terminal->BSC equipment BSC equipment -> base station terminal 3-3a Base station->Terminal->BSC equipment BSC equipment -> terminal -> base station Base Station 3-3b Base station->Terminal->BSC equipment BSC equipment -> terminal -> base station terminal

[0079] Table 1

[0080] Architecture 1 and Architecture 2 mainly involve the communication between the base station and the BSC equipment.

[0081] like Figure 4 As shown, in architecture 1, the base station is the RF source, the downlink transmitter of the BSC device (i.e., the control command transmitter), and the uplink receiver of the BSC device (i.e., the BSC receiver). At this time, the base station communicates directly with the BSC device. It can be understood that this deployment architecture has high requirements on the receiving sensitivity of the base station and BSC equipment, but the deployment is simple.

[0082] like Figure 5 As shown, in Architecture 2, the base station is the radio frequency source, but there is a relay device (which may be called a relay or a helper) for relaying the uplink from the BSC device to the base station. It is understandable that the relay device may also relay the downlink from the base station to the BSC device, and this embodiment of the application does not limit this.

[0083] Architecture 3-1a to Architecture 3-3b mainly involve the communication between the base station, BSC equipment and the terminal.

[0084] like Figure 6 As shown, in architecture 3-1a, the base station is the RF source, and the base station directly transmits downlink data to the BSC device; in the uplink, the BSC device first sends a backscattered signal to the terminal, which is then forwarded to the base station by the terminal.

[0085] like Figure 7 As shown, in architecture 3-1b, the terminal is the RF source, and the base station directly transmits downlink data to the BSC device; in the uplink, the BSC device first sends a backscattered signal to the terminal, which is then forwarded to the base station by the terminal.

[0086] like Figure 8As shown, in architecture 3-2a, the base station is the RF source. The base station first sends downlink data to the terminal, which is then forwarded to the BSC device. In the uplink, the BSC device directly sends a backscatter signal to the base station.

[0087] like Fig. 9 As shown, in architecture 3-2b, the terminal is the RF source, the base station first sends downlink data to the terminal, and then the terminal forwards it to the BSC device; in the uplink, the BSC device directly sends a backscatter signal to the base station.

[0088] like Fig.10 As shown, in architecture 3-3a, the base station is the RF source. The base station first sends downlink data to the terminal, which is then forwarded to the BSC device. In the uplink, the BSC device first sends a backscattered signal to the terminal, which is then forwarded to the base station by the terminal.

[0089] like Fig.11 As shown, in architecture 3-3b, the terminal is the RF source, the base station first sends downlink data to the terminal, and then the terminal forwards it to the BSC device; in the uplink, the BSC device first sends a backscatter signal to the terminal, and then the terminal forwards it to the base station.

[0090] 3. Symbiotic communication

[0091] Symbiotic communication refers to a type of backscatter communication system that meets special conditions and is not based on a single-base architecture.

[0092] like Fig.12 The figure shows a schematic diagram of information transmission in a symbiotic communication system. It can be seen that due to the existence of the BSC device, the carrier signal sent from the base station can be reflected by the BSC device to reach the terminal. At the same time, the BSC device modulates the signal it needs to send onto the carrier signal.

[0093] For the terminal, the signal energy received by the terminal from the base station will be stronger than when there is no BSC device, because the BSC device provides an additional multipath. When the main link (direct link from the base station to the terminal) signal (i.e., the first signal) is relatively weak, the existence of the secondary link (reflection link from the base station through the BSC device to the terminal) signal (i.e., the second signal) can improve the reception quality of the main link signal. At the same time, the BSC device also uses the carrier and spectrum provided by the main link signal, thereby helping the main link while "free riding", achieving a "mutual benefit" and "symbiosis" effect.

[0094] For the terminal, its direct link channel h(t) can be expressed as:

[0095]

[0096] in, represents the path set, h i represents the channel response of the ith path, t i represents the delay of the ith path, f i is the Doppler shift of the ith path.

[0097] The additional multipath channel h caused by the existence of the secondary link e (t) can be expressed as:

[0098] h e (t) = c(t)g(t)

[0099] =c(t)g 1 δ(tt g1 -t g2 ) 2 δ(tt g1 )

[0100] Where c(t) represents the information sent by the BSC device, g 1 and g 2 They represent the channel responses from the base station to the BSC device and from the BSC device to the terminal, respectively, g1 and t g2 They correspond to g 1 and g 2 delay.

[0101] Here, the BSC equipment is considered to be stationary and there is no Doppler frequency shift, so the equivalent channel from the base station to the UE is h eq (t) can be expressed as:

[0102] h eq (t) = h(t) + h e (t)

[0103] Where h(t) represents the direct link channel, h e (t) represents the above-mentioned additional multipath channel.

[0104] However, since the BSC device needs to load its own information c(t) on the carrier signal, the signal of the additional multipath channel is unstable. For example, when the BSC device uses binary phase shift keying (BPSK), the signal of the multipath channel may have a 180° phase reversal. Therefore, it is necessary to insert appropriate DMRS auxiliary demodulation on the primary link signal and the secondary link signal, and the symbol rate of the primary link signal and the symbol rate of the secondary link signal need to meet certain conditions.

[0105] like Fig.13 and Fig.14The figure shows the existing main link signal pattern and secondary link signal pattern suitable for symbiotic communication, wherein the main link signal is modulated by OFDM, and the secondary link signal is modulated by single carrier BPSK. The BPSK symbol rate is consistent with the OFDM symbol rate, that is, the secondary link signal remains unchanged during the time when the main link sends an OFDM symbol, so that OFDM can easily handle the additional multipath generated by the secondary link without generating interference between subcarriers, that is, without generating inter-channel interference (ICI).

[0106] At this time, the equivalent channel of the main link remains unchanged within the length of each symbol, but changes in adjacent symbols. Therefore, it is necessary to place a time-domain continuous DMRS on each symbol. In addition, OFDM is a multi-carrier system, so it is also necessary to place DMRS on multiple subcarriers in each symbol, and obtain the channel on each subcarrier by interpolation. This is Fig.13 The reason for placing time-domain continuous and frequency-domain comb DMRS in the

[0107] After the terminal obtains the primary link signal and removes its interference from the received signal, the remaining received signal only contains the modulation symbols about the secondary link (assuming no noise):

[0108] r(t)=h(t)+c(t)g(t)

[0109] Among them, r(t) represents the modulation symbol of the secondary link, h(t) represents the above-mentioned direct link channel, c(t) represents the information sent by the BSC device, and g(t) represents the channel response from the base station to the terminal via the BSC device.

[0110] For BPSK modulation, the received signal may be h(t)+g(t) or h(t)-g(t). Fig.14 As shown, the decision reference value can be obtained by placing two DMRS symbols of +1 and -1 at the beginning position of the secondary link signal.

[0111] In the symbiotic communication system, it is necessary to place appropriate DMRS on the main link signal and the secondary link signal to assist demodulation. However, the current DMRS placement methods, such as placing time-domain continuous or frequency-domain comb-shaped DMRS in the main link signal, or placing multiple DMRS in the secondary link signal, will cause the symbiotic communication system to have higher additional overhead due to too many DMRS. In addition, since the communication rate of the backscatter communication system is already relatively limited, the higher DMRS overhead will also reduce the communication efficiency of the symbiotic communication system.

[0112] In response to the problems existing in the related technologies, for the main link and the secondary link, the present application can configure an appropriate number of DMRS symbols for the main link signal and the secondary link signal according to the symbol rate and channel status of the main link and the secondary link, and design an efficient DMRS pattern, which can reduce the DMRS overhead while ensuring the communication quality of the symbiotic communication system.

[0113] The information transmission method, apparatus and device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0114] First, see Fig.15 FIG. 1 is a flowchart of an information transmission method provided in an embodiment of the present application, comprising the following steps:

[0115] Step S101: a first node sends indication information to a second node or a BSC device, where the indication information is used to indicate parameter information of at least one of a first signal and a second signal, and the parameter information includes at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0116] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0117] In some embodiments, Fig.16 As shown, the first node, the second node and the BSC device constitute a symbiotic communication system, in which the first node sends a first signal to the second node, and sends an excitation signal such as a radio frequency signal (usually a continuous carrier) to the BSC device, the BSC device reflects the excitation signal and loads its own information to send a second signal to the second node, and the second node then jointly demodulates the first signal and the second signal. The first node and the second node can be devices such as base stations, terminals or dedicated readers; the BSC device can be a traditional RFID tag, a passive Internet of Things (IoT) device or a semi-passive IoT device or an active IoT device, etc. The embodiment of the present application does not limit the specific classification method of the BSC device, wherein:

[0118] When the BSC device is a passive device, the BSC device has no energy storage capacitor or battery and relies on the radio frequency signal sent by the first node for energy supply (the received radio frequency signal is the power supply signal of the rectifier). At this time, the BSC device does not have the carrier generation capability and has the lowest power consumption;

[0119] When the BSC device is a semi-passive device, the BSC device has a storage capacitor or a battery and relies on non-RF signals for power supply. Optionally, the BSC device may also have a power amplifier (PA) or a low noise amplifier (LNA) or other active devices. In this case, the BSC device does not have the ability to generate carriers, and power consumption is secondary.

[0120] It can be understood that the DMRS overhead of symbiotic communication has two aspects, including the DMRS overhead of the primary link and the DMRS overhead of the secondary link. These two aspects are discussed below respectively.

[0121] (1) DMRS overhead of the primary link

[0122] Due to the impact of the existence of the secondary link on the main link channel (such as symbol changes in the secondary link will cause channel changes in the main link, etc.), the placement density of the DMRS of the main link in the time domain should be limited by the symbol rate of the secondary link (such as it needs to be at least greater than the symbol rate of the secondary link). For example, if the symbol rate ratio of the secondary link to the main link is 1:X, then the main link also needs to place at least one DMRS symbol (i.e., DMRS symbol) every X OFDM symbols in the time domain.

[0123] In addition, when the modulation symbol of the main link changes, the channel experienced by the main link also changes, so that the channel state information (CSI) of the main link cannot be interpolated using the sparse CSI estimate in the time domain, which will reduce the number of sample points that can be used for interpolation. In order not to reduce the quality of CSI estimation, the frequency domain placement density of DMRS must be increased accordingly, which further increases the overhead of DMRS.

[0124] Therefore, when the secondary link service quality permits, the rate of the secondary link should be reduced as much as possible, such as by instructing the secondary link to send the second signal at a lower rate through signal rate information, or by indicating the position and number of DMRS symbols required to be inserted into the first signal at the reduced secondary link rate through a DMRS pattern, thereby reducing the DMRS placement density of the main link.

[0125] (2) DMRS overhead of the secondary link

[0126] The DMRS pattern may be used to instruct the BSC device to reduce the number of DMRS symbols inserted into the secondary link signal. For example, reducing the DMRS symbols inserted into the data block of the secondary link by half may reduce the DMRS overhead by 50%.

[0127] For example, Fig.14As shown, taking into account the problem in the related art that placing two separate or two groups (or the corresponding situation where multiple DMRS symbols need to be averaged) of DMRS symbols in the secondary link signal will reduce the communication efficiency of the symbiotic communication system, the embodiment of the present application provides a feasible method to reduce DMRS overhead and improve communication efficiency: for example, retaining a DMRS symbol in the data block of the secondary link signal (in practice, it is not limited to retaining only one DMRS symbol), and agreeing that the DMRS symbol and a certain data symbol (target data symbol) in the data block have equal amplitude and opposite phase, so that the direct link channel can be obtained by summing the two symbols, and then the corresponding BSC device modulates +1 or -1 The signal g(t) or -g(t) is obtained.

[0128] Considering that the terminal cannot determine which signal corresponds to g(t) or -g(t), that is, there is a phase ambiguity of 180°, the embodiments of the present application provide the following two solutions to eliminate the phase ambiguity.

[0129] Solution 1: If the secondary link always adopts BPSK modulation, then two possibilities of +1 and -1 can be tried during demodulation, and then the phase ambiguity can be eliminated through data features such as cyclic redundancy check (CRC) check.

[0130] Solution 2: Divide the data of the secondary link into two parts: non-differential modulation and differential modulation. Use differential modulation to modulate and demodulate the differential modulation part. For the non-differential modulation part, try two possibilities of +1 or -1, and then eliminate the ambiguity by combining the data characteristics. Among them, the differential modulation part can use higher-order modulation methods such as Quadrature Phase Shift Keying (QPSK). At this time, since only part of the data has phase ambiguity, the demodulation success rate is higher.

[0131] As a possible implementation manner, parameter information of the first signal or the second signal may be transmitted through at least one of the following: dedicated signaling; system message; Radio Resource Control (RRC) signaling; Media Access Control Control Element (MAC CE); Downlink Control Information (DCI); Uplink Control Information (UCI); Sidelink Control Information (SCI); Physical frame preamble.

[0132] From the above steps, it can be seen that, unlike the related art which uses a fixed DMRS pattern by default (such as Fig.13 and Fig.14 The present application proposes that a first node sends indication information to indicate at least one of signal rate information and a demodulation reference signal DMRS pattern to a second node or a BSC device, whereby the second node or the BSC device can use the DMRS pattern directly indicated by the indication information, or the second node or the BSC device can use the DMRS pattern indirectly indicated by the indication information through the signal rate information, and no longer use the fixed DMRS pattern by default, which can reduce the number of DMRSs required to be inserted between the first signal and the second signal, thereby reducing the DMRS overhead and improving the communication efficiency.

[0133] The technical solution of the present application is described below in conjunction with specific embodiments, and the following embodiments can be combined with each other:

[0134] Implementation Method 1

[0135] This embodiment describes an example of measuring the coherence time, which can be used to determine signal rate information and frame structure.

[0136] Considering that the coherence time is the maximum time range in which the channel remains constant, if the same signal from the transmitter reaches the receiver within the coherence time, the receiver can consider that it has received one signal because the fading characteristics of the signals are almost completely similar. Therefore, in order to ensure the normal demodulation of the secondary link signal, the maximum symbol period of the secondary link should not exceed the coherence time T of the direct link channel. c , while T c ∝1 / f d (i.e. T c and 1 / f d positively correlated) or in, is the Doppler shift spread of the direct link channel, f i 、f j The frame structures of the first signal and the second signal should satisfy the constraint condition: the duration of the data blocks of the first signal and the second signal should not exceed the coherence time of the transmission link of the first signal. It can be understood that the duration of a group of DMRS symbols contained in the data block should not exceed the coherence time of the transmission link of the first signal.

[0137] In practice, the BSC device and the second node (such as a terminal) can be instructed to cooperate in measuring the coherence time of the channel, so as to determine the symbol rate and DMRS pattern of the BSC device (i.e., the secondary link) based on the measurement results, thereby ensuring the normal demodulation of the primary and secondary link signals. And considering that the coherence time of the primary link is the upper limit of the time domain interval for placing DMRS on the secondary link, the coherence time of the primary link can be used as the duration of a data block containing a group of DMRS on the secondary link to reduce the DMRS overhead.

[0138] In this embodiment, the first node, the second node and the BSC device cooperate with each other to determine the coherence time of the direct link (ie, main link) channel between the first node and the second node.

[0139] For example, the first node sends the first information to indicate the time window in which the BSC device maintains silence (no reflection). The first node then sends a reference signal, and the second node can measure the coherence time of the main link according to the reference signal. The embodiment of the present application does not limit the specific method used by the second node to measure the coherence time.

[0140] Taking the coherence time obtained by measuring the Doppler shift as an example, the first node can send a signal with a frequency of f 0 The second node receives the reference signal and determines that the received signal is dispersed to the frequency range except f 0 Other frequency points outside the range, where, in order to remove the influence of noise, the second node can only record the frequency points where the received signal energy is greater than the noise floor (NoiseFloor). 0 The second node can record all frequency points as f 1 ,...,f max , the Doppler frequency shift expansion is The second node can then obtain the coherence time of the main link channel according to the Doppler frequency shift expansion and an empirical formula.

[0141] For example, the second node can determine the coherence time by the following formula:

[0142]

[0143] Among them, T c represents the coherence time, f d represents Doppler shift spread and π represents pi.

[0144] As a possible implementation, before sending the above-mentioned reference signal, the first node may send second information to the second node to indicate parameter information such as waveform type, sequence type, sequence content, resource location, and resource quantity of the reference signal. The parameter information of the reference signal is used for receiving the reference signal. It can be understood that the parameter information of the reference signal can also be pre-agreed between the first node and the second node.

[0145] Implementation Method 2

[0146] This embodiment describes an example of parameter information indicating a primary link signal and a secondary link signal. Depending on the sending end of the indication information, it can be divided into the following two cases.

[0147] Case 1: the second node indicates parameter information of the primary link signal and the secondary link signal to the first node and the BSC device.

[0148] In this embodiment, the second node determines the parameter information of the first signal and the second signal respectively. At this time, after measuring the channel parameters such as the coherence time of the main link, the second node can determine the parameter information of the main link signal and the secondary link signal according to the channel parameters, and indicate the parameter information of the main link signal and the secondary link signal to the first node and the BSC device in the following two ways.

[0149] Method 1: Individual instructions.

[0150] In this embodiment, the second node sends indication information to the first node alone to indicate parameter information such as the rate and DMRS pattern of the primary link signal, and the second node sends indication information to the BSC device alone to indicate parameter information such as the rate and DMRS pattern of the secondary link signal.

[0151] Method 2: Joint instruction.

[0152] In one embodiment, the second node may indicate only an index of a set of parameters to the first node and the BSC device, where the set of parameters binds parameter information of the primary link signal and parameter information of the secondary link signal, as shown in Table 2 below.

[0153] index Main link rate Main link DMRS pattern Secondary link rate Secondary link DMRS pattern 1 Main link rate 1 Main link pattern index 1 Secondary link rate 1 Secondary link pattern index 1 …… …… …… …… ……

[0154] Table 2

[0155] In another embodiment, the second node may indicate only the parameter information of the primary link signal or the secondary link signal to the first node and the BSC device, and the first node or the BSC device determines the parameter information required by itself according to the mapping relationship between the parameter information of the primary and secondary link signals. For example, if the first node indicates only the parameter information of the primary link signal, the BSC device may determine the parameter information of the secondary link signal according to the parameter information of the primary link signal and the mapping relationship between the parameter information of the primary and secondary link signals.

[0156] It is understandable that the indexes of the above groups of parameter information or the mapping relationship between the parameter information of the primary and secondary link signals may be agreed upon by protocol, or indicated by the first node, the second node, the BSC device, etc. to other devices.

[0157] Case 2: The first node indicates parameter information of the primary link signal and the secondary link signal to the second node and the BSC device.

[0158] In this embodiment, the first node determines the parameter information of the first signal and the second signal respectively. At this time, the second node first needs to indicate the measured channel parameters such as the coherence time of the primary link to the first node, and the first node then determines the parameter information of the primary and secondary link signals according to the channel parameters of the primary link. Subsequently, the first node can indicate the parameter information of the primary and secondary link signals to the second node and the BSC device in the above-mentioned single indication or joint indication manner.

[0159] It can be understood that the first node needs to indicate parameter information of the primary and secondary link signals to the second node so that the second node can demodulate the primary and secondary link information.

[0160] Taking separate indication as an example, the first node sends third information to the BSC device, and the third information is used to indicate parameter information of the second signal; the first node sends fourth information to the second node, and the fourth information is used to indicate parameter information of each of the first signal and the second signal.

[0161] Taking the joint indication as an example, the first node sends fifth information to the second node and the BSC device respectively, and the fifth information is used to indicate the index of a set of parameter information, and the set of parameter information includes a set of bound parameter information of the first signal and the second signal; the first node sends parameter information of one of the first signal and the second signal to the second node and one of the BSC device.

[0162] In the second implementation mode, in addition to the first node or the second node determining the parameter information of the primary and secondary links, in some special cases (such as the first node is a terminal), the parameter information of the primary and secondary links can also be determined by the BSC device. For the rate, the rate information such as the absolute value of the rate, the symbol length, the rate ratio of the primary and secondary link signals (such as X:1) or the period ratio of the primary and secondary link signals (such as 1:X) can be indicated; for the DMRS pattern, the preset DMRS pattern index can be indicated, or the mapping relationship between the DMRS pattern and the primary link signal rate or the secondary link signal rate can be pre-set, and then the DMRS pattern can be indirectly indicated by indicating the rate. For example, after receiving the indication information of the secondary link signal rate, the BSC device can determine the DMRS pattern of the secondary link signal according to the secondary link signal rate and the mapping relationship between the DMRS pattern and the secondary link signal rate.

[0163] Implementation Method 3

[0164] This implementation describes an example of reducing the DMRS overhead of the main link signal, which can be divided into the following two methods in the frequency domain and the time domain.

[0165] Method 1: Reduce the DMRS placement density in the time domain.

[0166] In this embodiment, considering that the joint demodulation of the primary and secondary link signals needs to be performed under approximately the same (i.e., not much different) channels, the duration of the data blocks of the primary link and the secondary link must not exceed the coherence time T of the direct link channel. c The constraints of the first signal and the DMRS pattern of the first signal should satisfy that the time domain interval between every two DMRS symbols in a data block is not greater than the duration of a symbol of the second signal, so that the channels corresponding to each symbol (such as data symbol, DMRS symbol, etc.) in a data block of each of the primary link and the secondary link are approximately the same. Therefore, the coherence time can be set to the duration of the data block of the primary and secondary links to make the data block as large as possible, and the rates of the primary and secondary links are determined based on the coherence time, and the secondary link rate is made as small as possible compared to the primary link rate, so as to reduce the DMRS placement density in the time domain, thereby reducing the DMRS overhead.

[0167] For example, Fig.17 and Fig.18 Shown is a schematic diagram of a main link signal pattern and a secondary link signal pattern provided in an embodiment of the present application.

[0168] In this example, the coherence time spans 6 OFDM symbol times, and the symbol rates of the primary link and the secondary link can be set to 2:1, at which time the signal rate information of the first signal and the second signal can be determined.

[0169] As a possible implementation manner, the DMRS patterns of the first signal and the second signal may be determined according to a proportional relationship between signal rate information of the first signal and signal rate information of the second signal.

[0170] For example, at this time, the time domain length of the data block of the main link signal can be set to 6 symbol lengths, and the time domain length of the data block of the secondary link signal can be set to 3 symbol lengths. Since the symbol change of the secondary link will cause a certain degree of channel change, that is, when the symbol of the secondary link does not change within the coherence time, it can be regarded as the channel of the main link does not change, such as Fig.17 As shown, at this time, the main link can insert a DMRS every symbol length of the secondary link (equivalent to two symbol lengths of the main link), that is, the smaller the rate of the secondary link relative to the main link, the larger the symbol length of the main link DMRS can be inserted, thereby reducing the DMRS overhead of the main link. Compared with the case where the rate ratio of the primary and secondary links is 1:1, the DMRS overhead of the main link can be reduced by 50%.

[0171] It can be understood that, under the premise of satisfying the constraints of the data block, making the data block as large as possible can also reduce the DMRS overhead of the secondary link. For example, when two DMRS need to be placed in each data block of the secondary link, the larger the data block, the fewer DMRS need to be placed in the secondary link as a whole.

[0172] Method 2: Reduce the DMRS placement density in the frequency domain.

[0173] In this embodiment, the DMRS frequency domain placement density of the main link signal can be set according to the minimum DMRS frequency domain placement density required when the number of subcarriers between every two DMRS symbols in a data block meets the condition for channel estimation of the main link by interpolation, so as to reduce the DMRS overhead of the main link.

[0174] Considering that the main link has multiple subcarriers in the frequency domain, the placement density of DMRS in the frequency domain will affect the prediction accuracy of the subcarriers between DMRS (e.g., the greater the placement density in the frequency domain, the greater the prediction accuracy of the subcarriers). Considering that the channels corresponding to each symbol of the main link are coherent within a single symbol length of the secondary link, taking the symbol rate of the main link and the secondary link as 2:1 as an example, at this time, it can be regarded as the channel changing once every two OFDM symbol lengths of the main link. Therefore, the channels corresponding to two consecutive OFDM symbols of the main link can be regarded as coherent, and the DMRS inserted into one OFDM symbol can be multiplexed by another OFDM symbol with coherent channels. Therefore, Fig.19 and Fig. 20As shown, DMRS can be inserted at different frequency domain positions of the two consecutive OFDM symbols, so that the accuracy of channel estimation can be guaranteed while reducing the DMRS frequency domain placement density of each OFDM symbol by multiplexing DMRS between different OFDM symbols. This is because the channels of two consecutive OFDM symbols are still coherent, and the channel differences on adjacent OFDM symbols are small. Interpolating their estimated values ​​can obtain more accurate channel estimation values, which can also reduce the DMRS overhead of the main link. Compared with the case where the primary-secondary link rate ratio is 1:1, the DMRS overhead of the main link can be reduced by 1 / 3.

[0175] It can be understood that in implementation mode three, as the time domain placement density of DMRS on the main link signal increases, the frequency domain placement density of DMRS can be reduced accordingly (for example, in extreme cases, DMRS that is continuous in the time domain and sparse in the frequency domain can be placed), and as the frequency domain placement density of DMRS on the main link signal increases, the time domain placement density of DMRS can also be reduced accordingly (for example, in extreme cases, DMRS that is continuous in the frequency domain and sparse in the time domain can be placed), thereby reducing the DMRS overhead of the main link as a whole. However, the number of subcarriers spaced between every two DMRS symbols in a data block should satisfy the conditions for performing channel estimation on the main link by interpolation, that is, the DMRS pattern of the first signal should satisfy the number of subcarriers spaced between every two DMRS symbols in a data block: the conditions for performing channel estimation on the main link by interpolation, so as to ensure that channel estimation can be performed normally by methods such as 2D interpolation.

[0176] Implementation Method 4

[0177] This embodiment describes an example of reducing the DMRS overhead of the secondary link signal under non-differential modulation.

[0178] Considering that in the related art, it is necessary to place multiple DMRS symbols in a data block of a secondary link signal, resulting in a large DMRS overhead for the secondary link. Taking the secondary link using BPSK as an example, it is necessary to place two +1 and -1 symbols in the data block of the secondary link signal to obtain the thresholds h(t)+g(t) and h(t)-g(t) when judging the data symbol. In order to reduce the number of DMRS required to be placed in the data block of the secondary link signal, the embodiment of the present application provides another solution: reserve at least one DMRS symbol for the data block of the secondary link signal, and stipulate that the DMRS symbol is equal to the amplitude and opposite to the phase of a data symbol in the same data block. It should be noted that the non-differential modulation in the embodiment of the present application is not limited to BPSK.

[0179] In this embodiment, the frame structure of the second signal is: a data block includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol, and the at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbol have equal amplitudes and opposite phases.

[0180] The modulation mode of the data block is binary phase shift keying BPSK modulation, and the amplitude of each target data symbol is equal to that of each DMRS symbol and the phase is opposite. The number and position of each of the at least one DMRS symbol and the at least one target data symbol in the data block can be indicated by a DMRS pattern.

[0181] For example, Fig.21 Shown is a schematic diagram of another secondary link signal pattern (which is used to describe the frame structure) provided in an embodiment of the present application.

[0182] In this example, the first symbol of the data block is s. It is agreed that the DMRS symbol has the same amplitude and opposite phase as the first data symbol in the same data block. Then, according to the agreement, the last symbol of the data block (ie, the DMRS symbol) is -s.

[0183] At the receiving end (such as the second node), the received signals of the first symbol and the last symbol of the data block are r 1 (t) = h(t) + sg(t) and r 2 (t) = h(t) - sg(t), where h(t) represents the direct link channel and g(t) represents the channel response from the base station to the terminal via the BSC device. 1 (t) and r 2 (t), we can get Similarly, we can also get |g(t)|=|r 1 (t)-r 2 (t)| / |s|. It can be understood that the secondary link here adopts BPSK, so |s|=1.

[0184] At this time, the receiving end is not sure which signal corresponds to g(t) or -g(t), so the received signal can be divided into two categories, one of which is +1 and the other is -1, that is, there is a 180° phase ambiguity. The receiving end can try the two possibilities of +1 and -1 during demodulation, and then determine which one is +1 and which one is -1 through data features such as CRC check, thereby eliminating the phase ambiguity.

[0185] In the fourth implementation mode, the BSC device and the second node need to agree or indicate the position or number of DMRS symbols and the position or number of data symbols corresponding to the DMRS symbols.

[0186] It is understandable that the DMRS symbol may not have only one symbol, and in this case, a more accurate channel estimation result can be obtained by averaging multiple DMRS symbols. The multiple DMRS symbols may correspond to different data symbols in the same data block, or may correspond to the same data symbol in the same data block. For example, the BSC device and the second node may agree that the last two symbols in the data block are DMRS symbols, and the two DMRS symbols are equal in amplitude and opposite in phase to the data symbols at the last two symbols of the data block, respectively. The second node may then add the received signals of the two DMRS symbols and the received signals of the data symbols at the last two symbols of the data block and then average them to improve the demodulation accuracy; or, the BSC device and the second node may also agree that the two DMRS symbols are equal in amplitude and opposite in phase to the data symbols at the first symbol of the data block, and the second node may then add the received signals of the two DMRS symbols and then average them to the received signal of the data symbol at the first symbol to improve the demodulation accuracy.

[0187] Implementation Method 5

[0188] This embodiment describes an example of reducing the DMRS overhead of a secondary link signal under mixed non-differential modulation and differential modulation.

[0189] In this embodiment, the frame structure of the second signal is: a data block includes a non-differential modulation part and a differential modulation part, and the non-differential modulation part includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol.

[0190] The at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbol have equal amplitudes and opposite phases, the modulation mode of the non-differential modulation part is BPSK modulation; the differential modulation part includes at least two differentially modulated data symbols, and the modulation mode of the differential modulation part is BPSK modulation or a modulation mode of a higher order than BPSK modulation. The at least one DMRS symbol and the at least one target data symbol, and the number and position of each of the at least two differentially modulated data symbols in the data block can be indicated by the DMRS pattern of the secondary link.

[0191] For example, Fig. 22 Shown is a schematic diagram of another secondary link signal pattern provided in an embodiment of the present application.

[0192] In this example, the receiving end can obtain h(t) and |g(t)| through the first three symbols of the data block based on implementation mode 4. Starting from the fourth symbol, the BSC device uses the difference between the phase of the current symbol and the phase of the previous symbol to carry information (i.e., the data symbol is determined based on differential modulation). For example, for Differential Binary Phase Shift Keying (DBPSK), the information sent by the fourth symbol is:

[0193]

[0194] After removing the influence of h(t), the receiving end only needs to compare the phase difference between the current received symbol and the previous symbol to accurately know what information is carried, and there is no phase ambiguity problem.

[0195] Finally, for the non-differential modulation part, we still try the two possibilities of +1 or -1, and then combine all the information of the non-differential modulation and differential modulation parts, and use data features such as CRC check to eliminate the phase ambiguity of the non-differential modulation part.

[0196] It can be understood that, compared with implementation mode 4, the differential modulation part of implementation mode 5 can adopt higher-order modulation, such as QPSK, and since only part of the data has phase ambiguity, the demodulation success rate is higher.

[0197] Similarly, implementation mode 5 also requires the BSC device and the second node to agree or indicate the position or number of DMRS symbols, the position or number of data symbols of the non-differential modulation part corresponding to the DMRS symbols, and the position or number of data symbols of the differential modulation part. In addition, there may be more than one DMRS symbol in the data block, in which case a more accurate channel estimation result can be obtained by averaging multiple DMRS symbols.

[0198] Based on the above embodiments, the embodiments of the present application aim at the problem of large DMRS overhead in symbiotic communication, and design corresponding overhead reduction solutions for the primary link signal and the secondary link signal:

[0199] For signals of the primary link and the secondary link: When the secondary link service quality allows, the symbol rate of the secondary link is reduced as much as possible to reduce the DMRS overhead of the primary link. Considering that the maximum symbol period of the secondary link should not exceed the coherence time of the direct link channel, the BSC device and the terminal are instructed to cooperate in measuring the coherence time of the channel, and then the symbol rate and DMRS pattern of the BSC device are determined based on the measurement results.

[0200] For the secondary link signal, a pilot placement method that only requires one DMRS symbol is proposed, and it is agreed that the DMRS symbol is equal in amplitude and opposite in phase to a data symbol. However, phase ambiguity is introduced at the same time. Therefore, two frame structures, non-differential modulation only and mixed non-differential modulation and differential modulation, are proposed to solve this problem.

[0201] It can be understood that the signal transmission method provided in the embodiments of the present application can be applied to backscatter communication systems such as RFID, LTE, Narrow Band Internet of Things (NB-IoT), NR, and IEEE 802.11 evolution systems.

[0202] Second, see Fig.23 FIG. 1 is a flowchart of another information transmission method provided in an embodiment of the present application, comprising the following steps:

[0203] Step S201: the second node sends indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0204] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0205] As a possible implementation, the method further includes:

[0206] The first node determines parameter information of each of the first signal and the second signal.

[0207] As a possible implementation manner, the parameter information includes at least: a DMRS pattern; and the second node determines the parameter information of each of the first signal and the second signal, including:

[0208] The second node determines signal rate information of each of the first signal and the second signal;

[0209] The second node determines the DMRS patterns of the first signal and the second signal respectively according to a proportional relationship between the signal rate information of the first signal and the signal rate information of the second signal.

[0210] As a possible implementation manner, the frame structures of the first signal and the second signal respectively satisfy a constraint condition: the duration of the data blocks of the first signal and the second signal respectively does not exceed the coherence time of the transmission link of the first signal.

[0211] As a possible implementation, the method further includes:

[0212] The second node receives a reference signal sent by the first node;

[0213] The second node measures the coherence time of the transmission link of the first signal according to the received reference signal.

[0214] As a possible implementation, the method further includes:

[0215] Before receiving the reference signal sent by the first node, the second node receives second information sent by the first node, where the second information is used to indicate parameter information of the reference signal, and the parameter information of the reference signal is used for the second node to receive the reference signal;

[0216] After measuring the coherence time of the transmission link of the first signal, the second node sends the coherence time to the first node.

[0217] As a possible implementation, the method further includes:

[0218] The second node demodulates the first signal and the second signal according to respective parameter information of the first signal and the second signal.

[0219] Thirdly, see Fig.24 FIG. 1 is a flowchart of another information transmission method provided in an embodiment of the present application, comprising the following steps:

[0220] Step S301: a BSC device receives indication information sent by a first node or a second node, where the indication information is used to indicate parameter information of at least one of a first signal and a second signal, and the parameter information includes at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0221] As a possible implementation, the method further includes:

[0222] First information sent by the first node is received, where the first information is used to indicate a time window in which the BSC device maintains silence.

[0223] As a possible implementation manner, the indication information is used to indicate parameter information of the second signal, and the method further includes:

[0224] The BSC device determines parameter information of the second signal according to the received indication information;

[0225] The BSC device generates a reflected signal after reflecting the first signal according to the parameter information of the second signal, and modulates the signal that the BSC device needs to send to the second node, and sends the modulated signal as the second signal to the second node.

[0226] The information transmission method provided in the embodiment of the present application can be executed by an information transmission device. In the embodiment of the present application, the information transmission device provided in the embodiment of the present application is described by taking the information transmission method executed by the information transmission device as an example.

[0227] In a fourth aspect, an embodiment of the present application provides an information transmission device, which can be applied to a first node, such as Fig.25 As shown, the information transmission device 100 includes:

[0228] A first sending module 101 is configured to send indication information to a second node or a BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0229] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0230] Optionally, the device further comprises:

[0231] The first determining module is used to determine parameter information of each of the first signal and the second signal.

[0232] Optionally, the parameter information includes at least: a DMRS pattern; and the first determination module includes:

[0233] The first determination submodule is used to determine the DMRS patterns of the first signal and the second signal respectively according to the proportional relationship between the signal rate information of the first signal and the signal rate information of the second signal.

[0234] Optionally, the frame structure of each of the first signal and the second signal satisfies a constraint condition: the duration of each of the data blocks of the first signal and the second signal does not exceed the coherence time of the transmission link of the first signal.

[0235] Optionally, the DMRS pattern of the first signal satisfies at least one of the following:

[0236] The time domain interval between every two DMRS symbols in a data block is not greater than the duration of one symbol of the second signal;

[0237] The number of subcarriers spaced between every two DMRS symbols in a data block satisfies a condition for performing channel estimation on a transmission link of the first signal by interpolation.

[0238] Optionally, the frame structure of the second signal is associated with a DMRS pattern of the second signal, and the frame structure of the second signal is:

[0239] A data block includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol;

[0240] The at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbols have equal amplitudes and opposite phases.

[0241] Optionally, the frame structure of the second signal is associated with a DMRS pattern of the second signal, and the frame structure of the second signal is:

[0242] A data block includes a non-differential modulation part and a differential modulation part;

[0243] The non-differential modulation part includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol;

[0244] The at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbol have equal amplitudes and opposite phases, and the modulation mode of the non-differential modulation part is BPSK modulation;

[0245] The differential modulation part includes at least two differentially modulated data symbols, and the modulation mode of the differential modulation part is BPSK modulation or a modulation mode with a higher order than BPSK modulation.

[0246] Optionally, the device further comprises:

[0247] A first information sending module, used for sending first information, where the first information is used for indicating a time window in which the BSC device remains silent;

[0248] A reference signal sending module, used for sending a reference signal;

[0249] The coherence time receiving module is used to receive the coherence time measured by the second node according to the received reference signal.

[0250] Optionally, the device further comprises:

[0251] The second information sending module is used to send second information to the second node, where the second information is used to indicate parameter information of the reference signal, and the parameter information of the reference signal is used for the second node to receive the reference signal.

[0252] Optionally, the first sending module 101 includes at least one of the following:

[0253] A second sending submodule, used for sending third information to the BSC device, where the third information is used for indicating parameter information of the second signal;

[0254] A third sending submodule, used to send fourth information to the second node, where the fourth information is used to indicate parameter information of each of the first signal and the second signal;

[0255] a fourth sending submodule, configured to send fifth information to the second node and the BSC device respectively, wherein the fifth information is used to indicate an index of a set of parameter information, where the set of parameter information includes a set of bound parameter information of the first signal and the second signal;

[0256] The fifth sending submodule is used to send parameter information of one of the first signal and the second signal to one of the second node and the BSC device.

[0257] Optionally, the indication information is transmitted via at least one of the following:

[0258] Dedicated signaling, system messages, radio resource control RRC signaling, media access control unit MAC CE, downlink control information DCI, uplink control information UCI, sublink control information SCI, physical frame preamble preamble.

[0259] The information transmission device provided in the embodiment of the present application can implement the various processes implemented by the information transmission method embodiment described in the first aspect and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0260] In a fifth aspect, an embodiment of the present application provides another information transmission device, which can be applied to a second node, such as Fig.26 As shown, the information transmission device 200 includes:

[0261] A second sending module 201 is used to send indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern;

[0262] The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

[0263] Optionally, the device further comprises:

[0264] The first processing module is used to determine parameter information of the first signal and the second signal respectively.

[0265] Optionally, the parameter information at least includes: a DMRS pattern; and the first processing module includes:

[0266] A first processing submodule, configured to determine signal rate information of each of the first signal and the second signal;

[0267] The second processing submodule is used to determine the DMRS patterns of the first signal and the second signal respectively according to the proportional relationship between the signal rate information of the first signal and the signal rate information of the second signal.

[0268] Optionally, the frame structure of each of the first signal and the second signal satisfies a constraint condition: the duration of each of the data blocks of the first signal and the second signal does not exceed the coherence time of the transmission link of the first signal.

[0269] Optionally, the device further comprises:

[0270] A reference signal receiving module, configured to receive a reference signal sent by the first node;

[0271] The coherence time measurement module is used to measure the coherence time of the transmission link of the first signal according to the received reference signal.

[0272] Optionally, the device further comprises:

[0273] A second information receiving module, configured for the second node to receive second information sent by the first node before receiving the reference signal sent by the first node, wherein the second information is used to indicate parameter information of the reference signal, and the parameter information of the reference signal is used for the second node to receive the reference signal;

[0274] A coherence time sending module is used for the second node to send the coherence time to the first node after measuring the coherence time of the transmission link of the first signal.

[0275] Optionally, the device further comprises:

[0276] The demodulation module is used to demodulate the first signal and the second signal according to respective parameter information of the first signal and the second signal.

[0277] The information transmission device provided in the embodiment of the present application can implement the various processes implemented by the information transmission method embodiment described in the second aspect and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0278] In a sixth aspect, the present application provides another information transmission device, which can be applied to a BSC device, such as Fig. 27 As shown, the information transmission device 300 includes:

[0279] The first receiving module 301 is used to receive indication information sent by the first node or the second node, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

[0280] Optionally, the device further comprises:

[0281] The second receiving module is used to receive first information sent by the first node, where the first information is used to indicate a time window for the BSC device to remain silent.

[0282] Optionally, the indication information is used to indicate parameter information of the second signal, and the device further includes:

[0283] An information determination module, used to determine parameter information of the second signal according to the received indication information;

[0284] The signal processing module is used to modulate the reflected signal after reflecting the first signal according to the parameter information of the second signal, and the signal that the BSC device needs to send to the second node, and send the modulated signal as the second signal to the second node.

[0285] The information transmission device provided in the embodiment of the present application can implement the various processes implemented by the information transmission method embodiment described in the third aspect and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0286] The information transmission device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. For example, the terminal may include but is not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0287] like Fig.28 As shown, an embodiment of the present application also provides a communication device 1200, including a processor 1201 and a memory 1202, and the memory 1202 stores a program or instruction that can be run on the processor 1201. For example, when the communication device 1200 is a first node, the program or instruction is executed by the processor 1201 to implement the various steps of the information transmission method embodiment of the first aspect mentioned above; when the communication device 1200 is a first node, the program or instruction is executed by the processor 1201 to implement the various steps of the information transmission method embodiment of the second aspect mentioned above; when the communication device 1200 is a BSC device, the program or instruction is executed by the processor 1201 to implement the various steps of the information transmission method embodiment of the third aspect mentioned above; and the same technical effect can be achieved. In order to avoid repetition, it will not be repeated here.

[0288] The embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the steps in the information transmission method embodiment described in the first aspect or the second aspect. Each implementation process and implementation method of the above method embodiment can be applied to the terminal embodiment and can achieve the same technical effect. Specifically, Fig.29 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0289] The terminal 1300 includes but is not limited to: a radio frequency unit 1301, a network module 1302, an audio output unit 1303, an input unit 1304, a sensor 1305, a display unit 1306, a user input unit 1307, an interface unit 1308, a memory 1309 and at least some of the components of a processor 1310.

[0290] Those skilled in the art will appreciate that the terminal 1300 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 1310 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.29The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0291] It should be understood that in the embodiment of the present application, the input unit 1304 may include a graphics processing unit (GPU) 13041 and a microphone 13042, and the GPU 13041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 1306 may include a display panel 13061, and the display panel 13061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1307 includes a touch panel 13071 and at least one of other input devices 13072. The touch panel 13071 is also called a touch screen. The touch panel 13071 may include two parts: a touch detection device and a touch controller. Other input devices 13072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0292] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 1301 can transmit the data to the processor 1310 for processing; in addition, the RF unit 1301 can send uplink data to the network side device. Generally, the RF unit 1301 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0293] The memory 1309 can be used to store software programs or instructions and various data. The memory 1309 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 1309 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 1309 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0294] The processor 1310 may include one or more processing units; optionally, the processor 1310 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 1310.

[0295] The embodiment of the present application also provides a network side device, including a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the steps of the information transmission method embodiment described in the first aspect or the second aspect. Each implementation process and implementation method of the above method embodiment can be applied to the network side device embodiment and can achieve the same technical effect.

[0296] Specifically, the embodiment of the present application also provides a network side device. Fig.30 As shown, the network side device 1400 includes: an antenna 141, a radio frequency device 142, a baseband device 143, a processor 144 and a memory 145. The antenna 141 is connected to the radio frequency device 142. In the uplink direction, the radio frequency device 142 receives information through the antenna 141 and sends the received information to the baseband device 143 for processing. In the downlink direction, the baseband device 143 processes the information to be sent and sends it to the radio frequency device 142. The radio frequency device 142 processes the received information and sends it out through the antenna 141.

[0297] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 143, which includes a baseband processor.

[0298] The baseband device 143 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.30 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 145 through a bus interface to call the program in the memory 145 to execute the network device operations shown in the above method embodiment.

[0299] The network side device may further include a network interface 146, which is, for example, a common public radio interface (CPRI).

[0300] Specifically, the network side device 1400 of the embodiment of the present invention also includes: instructions or programs stored in the memory 145 and executable on the processor 84. The processor 144 calls the instructions or programs in the memory 145 to execute the method executed by each module of the information transmission device described in the fourth aspect or the fifth aspect, and achieves the same technical effect. To avoid repetition, it will not be repeated here.

[0301] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned information transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0302] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0303] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned information transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0304] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0305] The embodiments of the present application further provide a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the above-mentioned information transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0306] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0307] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0308] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. An information transmission method, characterized in that: The method comprises: The first node sends indication information to the second node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern; The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

2. The method according to claim 1, characterized in that The method further comprises: The first node determines parameter information of each of the first signal and the second signal.

3. The method according to claim 2, characterized in that The parameter information at least includes: a DMRS pattern; the first node determines the DMRS pattern of each of the first signal and the second signal, including: The first node determines the DMRS patterns of the first signal and the second signal respectively according to a proportional relationship between signal rate information of the first signal and signal rate information of the second signal.

4. The method according to claim 1, characterized in that: The frame structures of the first signal and the second signal respectively satisfy a constraint condition: the duration of the data blocks of the first signal and the second signal respectively does not exceed the coherence time of the transmission link of the first signal.

5. The method according to claim 4, characterized in that The DMRS pattern of the first signal satisfies at least one of the following: The time domain interval between every two DMRS symbols in a data block is not greater than the duration of one symbol of the second signal; The number of subcarriers spaced between every two DMRS symbols in a data block satisfies a condition for performing channel estimation on a transmission link of the first signal by interpolation.

6. The method according to claim 4, characterized in that The frame structure of the second signal is associated with the DMRS pattern of the second signal, and the frame structure of the second signal is: A data block includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol; The modulation mode of the data block is binary phase shift keying BPSK modulation, and the amplitudes of the at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbol are equal and the phases are opposite.

7. The method according to claim 4, characterized in that The frame structure of the second signal is associated with the DMRS pattern of the second signal, and the frame structure of the second signal is: A data block includes a non-differential modulation part and a differential modulation part; The non-differential modulation part includes at least one DMRS symbol and a target data symbol corresponding to each of the at least one DMRS symbol; wherein the at least one DMRS symbol and the target data symbol corresponding to each of the at least one DMRS symbol have equal amplitudes and opposite phases, and the modulation mode of the non-differential modulation part is BPSK modulation; The differential modulation part includes at least two differentially modulated data symbols, and the modulation mode of the differential modulation part is BPSK modulation or a modulation mode with a higher order than BPSK modulation.

8. The method according to claim 1, characterized in that Before the first node determines parameter information of each of the first signal and the second signal, the method further includes: The first node sends first information, where the first information is used to indicate a time window in which the BSC device remains silent; The first node sends a reference signal; The first node receives a coherence time measured according to the received reference signal.

9. The method according to claim 8, characterized in that Before the first node sends the reference signal, the method further includes: The first node sends second information to the second node, where the second information is used to indicate parameter information of the reference signal, and the parameter information of the reference signal is used for receiving the reference signal.

10. The method according to claim 1, characterized in that The first node sending indication information to the second node or the BSC device includes at least one of the following: The first node sends third information to the BSC device, where the third information is used to indicate parameter information of the second signal; The first node sends fourth information to the second node, where the fourth information is used to indicate parameter information of each of the first signal and the second signal; The first node sends fifth information to the second node and the BSC device respectively, where the fifth information is used to indicate an index of a set of parameter information, where the set of parameter information includes a set of bound parameter information of the first signal and the second signal; The first node sends parameter information of one of the first signal and the second signal to one of the second node and the BSC device.

11. The method according to any one of claims 1 to 11, characterized in that: The indication information is transmitted by at least one of the following: Dedicated signaling, system messages, radio resource control RRC signaling, media access control unit MAC CE, downlink control information DCI, uplink control information UCI, sublink control information SCI, physical frame preamble preamble.

12. An information transmission method, characterized in that: The method comprises: The second node sends indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern; The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

13. The method according to claim 12, characterized in that The method further comprises: The second node determines parameter information of each of the first signal and the second signal.

14. The method according to claim 13, characterized in that The parameter information at least includes: a DMRS pattern; the second node determines the parameter information of the first signal and the second signal respectively, including: The second node determines signal rate information of each of the first signal and the second signal; The second node determines the DMRS patterns of the first signal and the second signal respectively according to a proportional relationship between the signal rate information of the first signal and the signal rate information of the second signal.

15. The method according to claim 12, characterized in that The frame structures of the first signal and the second signal respectively satisfy a constraint condition: the duration of the data blocks of the first signal and the second signal respectively does not exceed the coherence time of the transmission link of the first signal.

16. The method according to claim 12, characterized in that The method further comprises: The second node receives a reference signal sent by the first node; The second node measures the coherence time of the transmission link of the first signal according to the received reference signal.

17. The method according to claim 16, characterized in that The method further comprises: Before receiving the reference signal sent by the first node, the second node receives second information sent by the first node, where the second information is used to indicate parameter information of the reference signal, and the parameter information of the reference signal is used for the second node to receive the reference signal; After measuring the coherence time of the transmission link of the first signal, the second node sends the coherence time to the first node.

18. The method according to claim 12, characterized in that The method further comprises: The second node demodulates the first signal and the second signal according to respective parameter information of the first signal and the second signal.

19. An information transmission method, characterized in that: The method comprises: The BSC device receives indication information sent by the first node or the second node, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

20. The method according to claim 19, characterized in that The method further comprises: First information sent by the first node is received, where the first information is used to indicate a time window in which the BSC device maintains silence.

21. The method according to claim 19, characterized in that The indication information is used to indicate parameter information of the second signal, and the method further includes: The BSC device determines parameter information of the second signal according to the received indication information; The BSC device generates a reflected signal after reflecting the first signal according to the parameter information of the second signal, and modulates the signal that the BSC device needs to send to the second node, and sends the modulated signal as the second signal to the second node.

22. An information transmission device, characterized in that: Applied to a first node, the device comprises: A first sending module is used to send indication information to the second node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern; The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

23. An information transmission device, characterized in that: Applied to a second node, the device comprises: A second sending module is used to send indication information to the first node or the BSC device, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, where the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern; The first signal is a signal sent by the first node to the second node, the second signal is a signal sent by the BSC device to the second node through backscattering technology, and the excitation signal of the second signal is sent by the first node.

24. An information transmission device, characterized in that: Applied to BSC equipment, the device comprises: The first receiving module is used to receive indication information sent by the first node or the second node, where the indication information is used to indicate parameter information of at least one of the first signal and the second signal, and the parameter information includes: at least one of signal rate information and a demodulation reference signal DMRS pattern.

25. A communication device, characterized in that: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and the program or instruction, when executed by the processor, implements the steps of the information transmission method as described in any one of claims 1 to 11, or implements the steps of the information transmission method as described in any one of claims 12 to 18, or implements the steps of the information transmission method as described in any one of claims 19 to 21.

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