Relay communication method, relay communication device, network equipment, terminal and medium

Abstract

The present disclosure provides a relay communication method, relay communication apparatus, network equipment, terminal, and medium, relating to the field of Internet of Things technology. The relay communication method based on a cellular network terminal includes: after a first duration has passed since the initial excitation signal was sent to a backscatter device, if no upload information feedback from the backscatter device is received, broadcasting relay demand information to notify the cellular network terminals within the service range that they need to relay the backscatter device. The relay demand information carries the geographic location of the backscatter device and the distance requirement for relaying. The geographic location and the distance requirement are used to select a relay terminal from the cellular network terminals. Through the technical solution of the present disclosure, by integrating backscattering and cellular networks, cellular network terminals can achieve backscattering Internet of Things-assisted communication.

Description

Technical Field

[0001] The present disclosure relates to the technical field of Internet of Things, and in particular to a relay communication method based on a cellular network terminal, an auxiliary communication device based on a cellular network terminal, a network device, a terminal, and a computer-readable storage medium. Background Art

[0002] Backscatter refers to a wireless technology that encodes and transmits signals without an active transmitter, enabling low-power and low-cost IoT communications.

[0003] The independent backscatter IoT architecture has disadvantages such as short communication distance, low system efficiency, and high deployment cost. Therefore, by integrating the backscatter IoT with the cellular network, the coverage of the backscatter IoT communication can be improved, the deployment cost can be reduced, and the spectrum utilization rate can be improved. However, when the backscatter IoT and the cellular network are integrated for communication, the backscatter IoT devices have extremely high sensitivity. This will result in the base station being unable to receive IoT information in a timely manner when the IoT device is in a blind spot or weak area of ​​the base station coverage, affecting the IoT communication effect.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a relay communication method, apparatus, network equipment, terminal and storage medium based on a cellular network terminal, which at least to a certain extent overcomes the problem in the related art that when the IoT device is in a blind spot or weak area of ​​base station coverage, the base station cannot receive IoT information in a timely manner, thereby affecting IoT communication.

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a relay communication method based on a cellular network terminal is provided, which is applied to a base station and includes: after a first time period has passed since the moment an initial excitation signal is sent to a backscatter device, if no upload information fed back by the backscatter device is received, broadcasting relay requirement information to notify the cellular network terminals within the service range that the backscatter device needs to be relayed, the relay requirement information carries the geographic location of the backscatter device and the distance requirement for the relay, and the geographic location and the distance requirement are used to select a relay terminal from the cellular network terminals.

[0008] In one embodiment, it also includes: determining a first distance between the base station and the backscatter device based on the geographical location of the backscatter device; determining the distance requirement based on the first distance, the first wireless propagation parameter of the base station, the second wireless propagation parameter of the cellular network terminal, and the power margin between the base station and the cellular network terminal, wherein the first wireless propagation parameter includes the first excitation signal transmission power and the first wireless propagation model parameter of the base station, and the second wireless propagation parameter includes the second excitation signal transmission power and the second wireless propagation model parameter of the cellular network terminal.

[0009] In one embodiment, determining the distance requirement based on the first distance, the first wireless propagation parameter of the base station, the second wireless propagation parameter of the cellular network terminal, and the power headroom between the base station and the cellular network terminal includes: constructing a distance requirement calculation formula based on the first distance, the first wireless propagation parameter of the base station, the second wireless propagation parameter of the cellular network terminal, and the power headroom between the base station and the cellular network terminal; determining the distance requirement based on the distance requirement calculation formula, wherein the distance requirement calculation formula is: Among them, d BS-BD is the first distance, P BS is the first excitation signal transmission power, P UE is the second excitation signal transmission power, K1 and K2 are the first wireless propagation model parameters, K′1 and K′2 are the second wireless propagation model parameters, and ΔR is the power margin.

[0010] In one embodiment, it also includes: determining the power headroom based on a power headroom report reported by the cellular network terminal, a first channel assessment parameter between the backscatter device and the base station, and a second channel assessment parameter between the backscatter device and the cellular network terminal.

[0011] In one embodiment, it also includes: determining the cellular network terminal that meets the distance requirement as an alternative terminal; instructing multiple alternative terminals to send pre-excitation signals to the backscatter device in sequence within the search time window; receiving the reflected signal sent by the backscatter device based on multiple pre-excitation signals within the search time window; notifying the alternative terminal with the strongest pre-excitation signal as the first relay terminal to start the first relay mode based on the decoding operation of the reflected signal. In the first relay mode, the first relay terminal sends a first excitation signal to the backscatter device, and the first excitation signal is used to instruct the backscatter device to send the backscatter signal generated based on the first excitation signal to the base station, wherein the starting moment of the search time window is the moment when the first time length has passed.

[0012] In one embodiment, the method further includes: determining the number of time slots based on the number of candidate terminals;

[0013] The length of the search time window is determined based on the number of time slots and the time slot duration.

[0014] In one embodiment, it also includes: if the reflected signal is not received within the search time window, then from the end moment of the search time window, within a second time period, a second relay terminal is selected from the cellular network terminal, and the second relay terminal is notified to turn on the second relay mode. In the second relay mode, the second relay terminal sends a second excitation signal to the backscatter device, and the second excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the second relay terminal, and the second relay terminal sends the decoding result of the backscatter signal to the base station.

[0015] In one embodiment, selecting a second relay terminal from the cellular network terminals includes: obtaining terminal location information reported by the cellular network terminal; detecting a second distance between the cellular network terminal and the backscatter device based on the geographic location and the terminal location information; and selecting the cellular network terminal with the smallest second distance as the second relay terminal.

[0016] In one embodiment, it also includes: if the decoding result of the backscatter signal is not received after a third time period from the end of the search time window, reselecting the second relay terminal based on the second distance; if the backscatter signal decoded by the second relay terminal is still not received after the second time period, reporting a system error, wherein the third time period is less than the second time period.

[0017] According to another aspect of the present disclosure, a relay communication method based on a cellular network terminal is provided, which is applied to a cellular network terminal, including: receiving relay demand information broadcast by a base station, the relay demand information carrying the geographical location of a backscatter device and the distance requirement of the relay; if it is determined that the relay demand is met based on the geographical location and the distance requirement, turning on the relay mode.

[0018] In one embodiment, if it is determined based on the geographic location and the distance requirement that the relay requirement is met, the relay mode is turned on, including: determining a second distance between the cellular network terminal and the backscatter device based on the geographic location; if the second distance is less than the distance requirement, sending a pre-excitation signal to the backscatter device; if a first start-up notification sent by a base station is received, turning on a first relay mode, the first start-up notification being generated based on a reflection signal of the pre-excitation signal received by the backscatter device by the base station; and sending a first excitation signal to the backscatter device, the first excitation signal being used to instruct the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station.

[0019] In one embodiment, the pre-activation signal includes identification information of the cellular network terminal.

[0020] In one embodiment, sending a pre-excitation signal to the backscatter device includes: performing a modulo operation on the identification information of the cellular network terminal based on the number of time slots in the search time window sent by the base station; determining the time slot number in the search time window based on the modulo operation result, and sending the pre-excitation signal based on the time slot number.

[0021] In one embodiment, it also includes: if a second activation notification sent by the base station is received, turning on the second relay mode; in the second relay mode, sending a second excitation signal to the backscatter device, the second excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the cellular network terminal; decoding the backscatter signal, and sending the decoding result to the base station.

[0022] According to another aspect of the present disclosure, an auxiliary communication device based on a cellular network terminal is provided, including: a broadcast module, configured to broadcast relay requirement information if no upload information fed back by the backscatter device is received after a first time period from the moment an initial excitation signal is sent to the backscatter device, so as to notify the cellular network terminals within the service range that the backscatter device needs to be relayed, the relay requirement information carrying the geographic location of the backscatter device and the distance requirement for the relay, and the geographic location and the distance requirement are used to select a relay terminal from the cellular network terminals.

[0023] According to another aspect of the present disclosure, an auxiliary communication device based on a cellular network terminal is provided, including: a receiving module for receiving relay requirement information broadcast by a base station, the relay requirement information carrying the geographical location of a backscatter device and the distance requirement of the relay; and a relay module for turning on a relay mode if it is determined that the relay requirement is met based on the geographical location and the distance requirement.

[0024] According to another aspect of the present disclosure, a network device is provided, comprising: a processor; and a memory for storing executable instructions of the processor; the processor is configured to execute the cellular network terminal-based relay communication method of the first aspect by executing the executable instructions.

[0025] According to another aspect of the present disclosure, a terminal is provided, comprising: a processor; and a memory for storing executable instructions of the processor; the processor is configured to execute the relay communication method based on a cellular network terminal of the second aspect by executing the executable instructions.

[0026] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the computer program implements the above-mentioned relay communication method based on a cellular network terminal.

[0027] The relay communication solution based on cellular network terminals provided by the embodiments of the present disclosure deeply considers the situation where the cellular network terminal acts as a relay device for the backscattering Internet of Things. When the base station cannot directly receive the information of the backscattering device, the relay demand information is broadcast within the service range based on the acquired location information of the backscattering device and the distance requirement for the terminal that can meet the relay requirements, so that the terminal receiving the broadcast can perform a self-assessment of whether it can serve as a relay terminal based on the above information, and select a relay terminal from multiple cellular network terminals to perform the relay function based on its self-assessment result, so that when the base station cannot receive the Internet of Things information of the backscattering device in time, the Internet of Things information can be transmitted based on the relay function of the relay terminal, so that the cellular network terminal can realize backscattering Internet of Things assisted communication through the integration of backscattering and cellular networks.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0030] Figure 1 A schematic diagram of a system integrating a cellular network and a backscatter Internet of Things is shown in an embodiment of the present disclosure;

[0031] Figure 2 A flow chart of a relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0032] Figure 3 A flow chart showing another relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0033] Figure 4 A flow chart of another relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0034] Figure 5 A flow chart of another relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0035] Figure 6 A flow chart of another relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0036] Figure 7 A flow chart of another relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0037] Figure 8 A schematic diagram of an auxiliary communication device based on a cellular network terminal in an embodiment of the present disclosure is shown;

[0038] Figure 9 A schematic diagram showing another auxiliary communication device based on a cellular network terminal according to an embodiment of the present disclosure is shown;

[0039] Figure 10 A structural block diagram of a computer device in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0041] In addition, the accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0042] When backscatter IoT and cellular networks are integrated for communication, due to the extremely high sensitivity requirements of backscatter IoT devices, IoT devices are very likely to be in blind spots or weak areas of base station coverage, resulting in the base station being unable to receive IoT information in a timely manner. At this time, cellular network terminals can be used as relays to help transmit IoT information to the base station.

[0043] Specifically, in the scenario of integrated communication of backscattering Internet of Things and cellular network, where the position of the backscattering device of the Internet of Things is relatively fixed, in order to solve the problem that the base station cannot receive the backscattering device information of the Internet of Things in its blind spot / weak coverage area, a cellular network terminal is used for relay assistance to realize the communication method of the integrated system of backscattering and cellular network.

[0044] Specifically, when the base station fails to receive IoT information within the specified time for the first time, the base station first selects an auxiliary relay terminal that meets the requirements, which is only responsible for stimulating the backscattering device, and the base station receives the backscattering information. If unsuccessful, the base station selects a complete relay UE again, which is responsible for stimulating, receiving, decoding and forwarding IoT device information back to the base station, so that the base station can receive the backscattering information of its blind / weak coverage area.

[0045] Figure 1 A schematic diagram of a reflective Internet of Things system in an embodiment of the present disclosure is shown.

[0046] like Figure 1 As shown, the reflection Internet of Things system includes a base station 102, a backscatter device 104, and a cellular network terminal 106.

[0047] The base station 102 transmits a wireless carrier signal to the cellular network terminal 106 to establish normal communication with the cellular network terminal 106. The wireless signal transmitted at the same time can stimulate the backscattering device 104 of the backscattering Internet of Things and receive information uploaded by the backscattering device 104.

[0048] The backscatter device 104 receives the wireless signal from the base station 102 and the cellular network terminal 106 as an excitation signal, modulates its own data on the excitation signal, and transmits it back to the base station 102 or the cellular network terminal 106 .

[0049] The cellular network terminal 106 establishes normal communication with the base station 102 and has a relay function, and can send an excitation signal to the backscatter device 104 and receive and demodulate information from the backscatter device 104 .

[0050] In addition, if Figure 1 As shown, the solid line is used to represent the communication link in the non-relay mode, and the dotted line represents the communication link in the relay mode.

[0051] Hereinafter, each step of the relay communication method based on a cellular network terminal in this exemplary implementation will be described in more detail with reference to the accompanying drawings and embodiments.

[0052] Figure 2 A flow chart of a relay communication method based on a cellular network terminal in an embodiment of the present disclosure is shown.

[0053] like Figure 2 As shown, a relay communication method based on a cellular network terminal according to an embodiment of the present disclosure is applied to a base station and includes the following steps:

[0054] Step S202: After a first period of time has passed since the initial excitation signal was sent to the backscatter device, if no upload information feedback from the backscatter device is received, relay requirement information is broadcast to notify cellular network terminals within the service range that the backscatter device needs to be relayed. The relay requirement information carries the geographic location of the backscatter device and the distance requirement for the relay. The geographic location and distance requirement are used to select a relay terminal from the cellular network terminals.

[0055] The cellular network terminal is a terminal with a relay mode.

[0056] Specifically, assuming that the timer of the base station starts at time 0, the excitation signal directly sent by the base station is the initial excitation signal, and the base station sends the initial excitation signal to the backscattering device at time 0. The transmission power of the excitation signal is P BS , the base station did not receive the information uploaded by the backscatter device during the time period [0, t1]; the base station sent a message in the form of a broadcast to the cellular network terminals within its service range, and the message sent included the geographical location and distance requirement d of the backscatter device that did not receive the information.UE-BD , to notify the cellular network terminal to calculate and determine whether the actual distance between it and the backscatter device meets the d UE-BD Require.

[0057] In addition, the relay mode of the relay terminal includes but is not limited to an auxiliary relay mode and a complete relay mode.

[0058] In this embodiment, by deeply considering the situation where the cellular network terminal acts as a relay device of the backscatter Internet of Things, when the base station cannot directly receive the information of the backscatter device, the relay demand information is broadcast within the service range based on the acquired location information of the backscatter device and the distance requirement for the terminal that can meet the relay requirement, so that the terminal receiving the broadcast can perform a self-assessment of whether it can serve as a relay terminal based on the above information, and select a relay terminal from multiple cellular network terminals to perform the relay function based on its self-assessment result, so that when the base station cannot receive the Internet of Things information of the backscatter device in time, the Internet of Things information can be transmitted based on the relay function of the relay terminal, so that the cellular network terminal can realize backscatter Internet of Things assisted communication through the integration of backscatter and cellular networks.

[0059] In one embodiment, it also includes: determining a first distance between the base station and the backscatter device based on the geographic location of the backscatter device; determining a distance requirement based on the first distance, a first wireless propagation parameter of the base station, a second wireless propagation parameter of the cellular network terminal, and a power margin between the base station and the cellular network terminal.

[0060] The first wireless propagation parameters include the first excitation signal transmission power and the first wireless propagation model parameters of the base station, and the second wireless propagation parameters include the second excitation signal transmission power and the second wireless propagation model parameters of the cellular network terminal.

[0061] In this embodiment, the distance requirement is determined based on wireless propagation parameters such as transmission power and information such as relative distance to ensure that the selected relay terminal has reliable relay capabilities, thereby ensuring the reliability of the relay terminal in transmitting IoT information.

[0062] In one embodiment, determining the distance requirement based on the first distance, the first wireless propagation parameter of the base station, the second wireless propagation parameter of the cellular network terminal, and the power margin between the base station and the cellular network terminal includes: constructing a distance requirement calculation formula based on the first distance, the first wireless propagation parameter of the base station, the second wireless propagation parameter of the cellular network terminal, and the power margin between the base station and the cellular network terminal; and determining the distance requirement based on the distance requirement calculation formula.

[0063] The distance requirement calculation formula is:

[0064] Among them, dBS-BD is the first distance, P BS is the first excitation signal transmission power, P UE is the second excitation signal transmission power, K1 and K2 are the first wireless propagation model parameters, K′1 and K′2 are the second wireless propagation model parameters, and ΔR is the power margin.

[0065] Specifically, the signal strength received by the backscatter device from the base station is expressed as R BS , as shown in formula (1).

[0066] R BS =P BS -K1logd BS-BD -K2 (1)

[0067] The signal strength received by the backscatter device at the terminal is expressed as R UE , as shown in formula (2).

[0068] R UE =P UE -K1′logd UE-BD -K2′ (2)

[0069] When R UE >R BS , it is considered that the UE meets the requirements of assisted relay, assuming R UE -R BS =ΔR>0, then the expression of power margin ΔR is shown in formula (3).

[0070] (P UE -P BS )-(K1′logd UE-BD -K1logd BS-BD )-(K2′-K2)=ΔR (3) Furthermore, we obtain formula (4).

[0071]

[0072] Finally, we get the distance requirement d UE-BD The detailed calculation formula is shown in formula (5).

[0073]

[0074] Among them, d BS-BD It is calculated based on the latitude, longitude and altitude of the base station and the backscatter device.

[0075] K1 and K2 are the base station's wireless propagation model parameters, determined by the topography within the base station's coverage area. K'1 and K'2 are the UE's wireless propagation model parameters, determined by the topography within the UE's coverage area. These four parameters are typically pre-set during the wireless planning phase through wireless model calibration.

[0076] P BS is the base station excitation signal transmission power, which is determined by pre-testing on the base station side, P UE The terminal's excitation signal transmission power is set by default to the terminal's maximum transmittable power and can be considered a fixed value.

[0077] In one embodiment, the method further includes determining the power headroom based on a power headroom report reported by a cellular network terminal, a first channel estimation parameter between the backscatter device and the base station, and a second channel estimation parameter between the backscatter device and the cellular network terminal.

[0078] ΔR is the power margin, a positive value set to improve communication reliability by accounting for wireless channel uncertainty. It depends on the speed and amplitude of wireless channel variations, as well as the required communication reliability. The faster the variation, the greater the amplitude, and the higher the reliability requirement, the greater the power margin.

[0079] like Figure 3 As shown, in one embodiment, it also includes:

[0080] Step S302: Determine a cellular network terminal that meets the distance requirement as a candidate terminal.

[0081] In which, on the terminal side, the cellular network terminal determines whether the second distance between itself and the backscattering device is less than d UE-BD , if the second distance is less than d UE-BD , it is determined to be a cellular network terminal that meets the distance requirements and is fed back to the base station.

[0082] Step S304: Instruct multiple candidate terminals to send pre-excitation signals to the backscatter device in sequence within the search time window.

[0083] Among them, by instructing the candidate terminals to send pre-excitation signals in sequence according to the time sequence, the collision of pre-excitation signals at the backscattering device can be reduced.

[0084] Specifically, the search time window is determined in the following manner: the number of time slots is determined based on the number of candidate terminals; and the length of the search time window is determined based on the number of time slots and the time slot duration.

[0085] To avoid collisions caused by multiple candidate terminals sending pre-excitation signals to the backscatter device at the same time, the candidate terminals that meet the requirements send pre-excitation signals to the backscatter device in sequence according to the time slot order. The specific sending rules are as follows:

[0086] At time t1, the base station sets a search time window while broadcasting the relay demand information. The start time of the search time window is WinStart = t1, and the time window width is WinLengh = NT slot ,T slot is a time slot, and N is the number of time slots reserved by the base station for receiving the pre-excitation signal reflected by the backscatter device. N can be determined according to the UE density in the mobile network. When there are many UEs and the density is high, more time slots can be reserved. The receiving time slots of the search time window are divided into:

[0087] [t1,t1+T slot ],[t1+T slot ,t1+2T slot ], ...., [t1+(N-1)T slot ,t1+NT slot ]

[0088] Step S306: receiving a reflected signal sent by a backscattering device based on multiple pre-excitation signals within the search time window.

[0089] Step S308, based on the decoding operation of the reflected signal, notifies the alternative terminal with the strongest pre-excitation signal to start the first relay mode as the first relay terminal. In the first relay mode, the first relay terminal sends a first excitation signal to the backscattering device, and the first excitation signal is used to instruct the backscattering device to send the backscattering signal generated based on the first excitation signal to the base station.

[0090] The first relay mode is specifically an auxiliary relay mode.

[0091] The starting time of the search time window is time t1 after the first duration.

[0092] Specifically, the base station is in [t1, t1+NT slot ] time period, receives the pre-excitation signal reflected by the backscatter device, selects the cellular network terminal with the strongest signal strength as the first relay terminal, that is, designates the auxiliary relay, and the base station decodes the signal with the strongest pre-excitation signal strength to obtain the ID number of this terminal. Then the base station notifies this cellular network terminal to turn on the auxiliary relay mode, and the first relay terminal sends an excitation signal to the backscatter device. This excitation signal indicates that the backscatter device can transmit its own information to the base station. The base station receives the backscatter device information, and the process ends.

[0093] In this embodiment, a terminal that can enable the first relay mode, i.e., the auxiliary relay mode, is first selected, so that the first relay terminal is only responsible for the excitation operation and is not responsible for receiving and forwarding information. Compared with directly selecting a complete relay, the power consumption of the terminal relay can be saved and the impact on the terminal performance can be reduced. By selecting the relay based on the strength of the reflected excitation signal, the optimal auxiliary relay terminal can be selected from many candidates.

[0094] like Figure 4 As shown, in one embodiment, it also includes:

[0095] Step S402: No reflected signal is received within the search time window.

[0096] Then, within a second time period starting from the end of the search time window, selecting a second relay terminal from the cellular network terminals specifically includes:

[0097] Step S404: Acquire terminal location information reported by the cellular network terminal.

[0098] Step S406: Detect a second distance between the cellular network terminal and the backscatter device based on the geographical location and the terminal location information.

[0099] Step S408: Select the cellular network terminal with the smallest second distance as the second relay terminal.

[0100] Step S410, notify the second relay terminal to turn on the second relay mode. In the second relay mode, the second relay terminal sends a second excitation signal to the backscattering device. The second excitation signal is used to instruct the backscattering device to send the backscattering signal generated based on the second excitation signal to the second relay terminal, and the second relay terminal sends the decoding result of the backscattering signal to the base station.

[0101] The second relay mode is specifically a complete relay mode.

[0102] Specifically, if [t1,t1+NT slot ] time period, the base station cannot receive the pre-excitation signal reflected by the backscattering device, [t1+NT slot , t1+NT slot +t2] time, the base station starts to select the second relay terminal, that is, the complete relay terminal to forward the backscatter device information. t2 can be set according to actual business needs, actual environmental factors, etc.

[0103] The base station selects complete relays based on the distance between the cellular network terminal and the backscatter device, from closest to farthest. The base station knows the latitude, longitude, and altitude of the backscatter device. Cellular network terminals within the base station's range report their latitude, longitude, and altitude in real time, allowing the base station to calculate the distance between the cellular network terminals within its service range and the backscatter device.

[0104] The base station first notifies the nearest cellular network terminal to act as the second relay terminal to start the second relay mode, that is, the complete relay mode. The second relay terminal sends an excitation signal to the backscattering device, the backscattering device sends a backscattering signal, and the second relay terminal demodulates the backscattering signal and forwards the demodulation result to the base station through the air interface. The process ends.

[0105] In this embodiment, if the base station still does not receive the information of the backscatter device after the auxiliary relay mode is turned on in the selected first relay terminal, it is necessary to select the terminal with the second relay mode turned on, that is, the terminal with the complete relay mode as the second relay terminal to complete the transmission of the backscatter device information. Based on the integration of the cellular network terminal relay-assisted backscatter and the cellular network, the reliable transmission of the backscatter signal is guaranteed.

[0106] In one embodiment, further comprising:

[0107] Step S412: If no decoding result of the backscatter signal is received within a third time period from the end of the search time window, reselect a second relay terminal based on the second distance.

[0108] Step S414: If the decoded backscatter signal from the second relay terminal is still not received after the second time period, a system error is reported.

[0109] Among them, the third duration t s Less than the second duration t2.

[0110] Specifically, if the base station sets the time [t1+NT slot , t1+NT slot +t s ] No backscatter information is received (the third time length t s is the waiting time for receiving backscatter information), notify the second closest cellular network terminal to start the complete relay mode, if the base station is [t1+NT slot +t s , t1+NT slot +2t s If the backscatter information is received within t1+NT, the process ends. Otherwise, the third closest cellular network terminal is notified to start the second relay mode until the time reaches t1+NT slot +t2 moment.

[0111] If the time reaches t1+NT slot +t2 time, the base station still does not receive the backscatter information, then the system reports an error, wait for a while, and repeat the above steps. Figures 2 to 4 The process in .

[0112] like Figure 5 As shown, a relay communication method based on a cellular network terminal according to another embodiment of the present disclosure is applied to a cellular network terminal and includes the following steps:

[0113] Step S502: Receive relay requirement information broadcast by a base station. The relay requirement information carries the geographical location of the backscatter device and the distance requirement of the relay.

[0114] Step S504: If it is determined based on the geographical location and the distance requirement that the relay requirement is met, the relay mode is turned on.

[0115] In this embodiment, by receiving the broadcast of the base station, a self-assessment is performed on whether it can serve as a relay terminal based on the geographical location and distance requirements of the backscatter device carried in the broadcast, so that the base station selects a relay terminal from multiple cellular network terminals to perform the relay function based on its self-assessment result, so that when the base station cannot receive the Internet of Things information of the backscatter device in time, the Internet of Things information can be transmitted based on the relay function of the relay terminal, so that the cellular network terminal can realize backscattering Internet of Things assisted communication through the integration of backscatter and cellular networks.

[0116] like Figure 6 As shown, in one embodiment, in step S504, if it is determined based on the geographical location and the distance requirement that the relay requirement is met, a specific implementation method of enabling the relay mode includes:

[0117] Step S602: Determine a second distance between the cellular network terminal and the backscatter device based on the geographical location.

[0118] Step S604: If the second distance is less than the distance requirement, a pre-excitation signal is sent to the backscattering device.

[0119] Step S606: If a first activation notification sent by the base station is received, the first relay mode is activated. The first activation notification is generated based on a reflection signal of the pre-excitation signal from the backscatter device received by the base station.

[0120] Step S608: Send a first excitation signal to the backscatter device, where the first excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station.

[0121] In this embodiment, the terminal determines whether it can serve as an alternative terminal by detecting the relationship between the distance between itself and the backscatter device and the distance requirement. When it can serve as an alternative terminal, it first sends a pre-excitation signal to the backscatter device. The base station determines the alternative terminal with the strongest pre-excitation signal through the reflected signal of the received pre-excitation signal. By receiving the first start-up notification sent by the base station, the alternative terminal is selected as the first relay terminal. The first relay terminal is only responsible for the excitation operation and is not responsible for receiving and forwarding information. Compared with directly selecting a complete relay, the power consumption of the terminal relay can be saved and the impact on the terminal performance can be reduced. By selecting the relay based on the strength of the reflected excitation signal, the optimal auxiliary relay terminal can be selected from many candidates.

[0122] In one embodiment, the pre-energization signal includes identification information of the cellular network terminal.

[0123] In one embodiment, a pre-excitation signal is sent to a backscatter device, including: performing a modulo operation on identification information of a cellular network terminal based on the number of time slots in a search time window sent by a base station; determining a time slot sequence number in the search time window based on a result of the modulo operation, so as to send a pre-excitation signal based on the time slot sequence number.

[0124] Specifically, the cellular network terminals within the service range of the base station have their own ID numbers. The terminals that meet the requirements are selected as candidate terminals and take the modulus of the corresponding values ​​of the ID. Based on the modulus value, these UEs that meet the requirements are evenly distributed in N time slots and, starting from time t1, transmit pre-excitation signals to the backscattering device in sequence according to the different time slots they belong to. That is, the time slots in which the UEs send excitation signals are shown in formula (6).

[0125] Mod(ID Value,N)(6)

[0126] For example, when N is 10, the candidate terminal with ID number 24 performs a modulo operation Mod(24,10)=4, and the candidate terminal No. 24 sends an excitation signal at the beginning of the fifth time slot, that is, at t1+4T slot Send pre-excitation signal.

[0127] like Figure 7 As shown, in one embodiment, it also includes:

[0128] Step S702: If a second activation notification sent by the base station is received, the second relay mode is activated.

[0129] Step S704: In the second relay mode, a second excitation signal is sent to the backscatter device, where the second excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the second relay terminal.

[0130] Step S706: decode the backscattered signal and send the decoding result to the base station.

[0131] In this embodiment, if the terminal receives the second activation notification sent by the base station, it indicates that after the first relay terminal selected by the base station turns on the auxiliary relay mode, the base station still has not received the information of the backscatter device. By receiving the second activation notification, the second relay mode, that is, the complete relay mode, is turned on, and the terminal performs complete relaying as the second relay terminal to complete the transmission of the backscatter device information. Based on the integration of cellular network terminal relay auxiliary backscatter and cellular network, the reliable transmission of the backscatter signal is guaranteed.

[0132] It should be noted that the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of the present invention and are not intended to be limiting. It is readily understood that the processes illustrated in the above figures do not indicate or limit the temporal order of these processes. Furthermore, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0133] Refer to the following Figure 8 hereinafter, an auxiliary communication device 800 based on a cellular network terminal according to an embodiment of the present invention is described. Figure 8 The auxiliary communication device 800 based on a cellular network terminal is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0134] The auxiliary communication device 800 based on a cellular network terminal is implemented as a hardware module. Components of the auxiliary communication device 800 based on a cellular network terminal may include, but are not limited to, a broadcast module 802 configured to broadcast relay request information, if no upload information is received from the backscatter device after a first period of time has passed since the initial excitation signal was sent to the backscatter device, to notify cellular network terminals within the service range that relaying of the backscatter device is required. The relay request information carries the geographic location of the backscatter device and the required distance for relaying. The geographic location and distance requirement are used to select a relay terminal from among the cellular network terminals.

[0135] Refer to the following Figure 9 hereinafter, an auxiliary communication device 900 based on a cellular network terminal according to an embodiment of the present invention is described. Figure 9 The auxiliary communication device 900 based on a cellular network terminal is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0136] The auxiliary communication device 900 based on a cellular network terminal is implemented as a hardware module. The components of the auxiliary communication device 900 based on a cellular network terminal may include, but are not limited to: a receiving module 902 for receiving relay requirement information broadcast by a base station, which carries the geographic location of the backscatter device and the required distance for relaying; and a relay module 904 for enabling relay mode if the relay requirement is determined to be met based on the geographic location and distance requirement.

[0137] Those skilled in the art will appreciate that various aspects of the present invention may be implemented as systems, methods, or program products. Therefore, various aspects of the present invention may be implemented in the following forms: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which may be collectively referred to herein as "circuits," "modules," or "systems."

[0138] Refer to the following Figure 10 The electronic device 1000 according to this embodiment of the present invention is described below. The electronic device 1000 may be a network device or a terminal. Figure 10 The electronic device 1000 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0139] like Figure 10 As shown, electronic device 1000 is implemented as a general-purpose computing device. Components of electronic device 1000 may include, but are not limited to, the aforementioned at least one processing unit 1010, the aforementioned at least one storage unit 1020, and a bus 1030 connecting various system components (including storage unit 1020 and processing unit 1010).

[0140] The storage unit stores program codes, which can be executed by the processing unit 1010, so that the processing unit 1010 performs the steps according to various exemplary embodiments of the present invention described in the above “Exemplary Method” section of this specification. For example, the processing unit 1010 can perform the following steps: Figure 2 The scheme described in step S202 shown in FIG.

[0141] The storage unit 1020 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 10201 and / or a cache memory unit 10202 , and may further include a read-only memory unit (ROM) 10203 .

[0142] The storage unit 1020 may also include a program / utility 10204 having a set (at least one) of program modules 10205, such program modules 10205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0143] Bus 1030 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0144] The electronic device 1000 can also communicate with one or more external devices 1070 (e.g., a keyboard, a pointing device, a Bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 1000, and / or any device that enables the electronic device 1000 to communicate with one or more other computing devices (e.g., a router, a modem, etc.). Such communication can occur via an input / output (I / O) interface 1050. Furthermore, the electronic device 1000 can also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 1060. As shown, the network adapter 1060 communicates with other modules of the electronic device 1000 via a bus 1030. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 1000, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0145] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0146] In exemplary embodiments of the present disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the above-described methods of this specification is stored. In some possible implementations, various aspects of the present invention may also be implemented in the form of a program product, which includes program code. When the program product is executed on an electronic device, the program code is used to cause the electronic device to perform the steps according to various exemplary embodiments of the present invention described in the "Exemplary Methods" section of this specification.

[0147] According to an embodiment of the present invention, a program product for implementing the above-mentioned method can be a portable compact disc read-only memory (CD-ROM) and include program code, and can be run on an electronic device, such as a personal computer. However, the program product of the present invention is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0148] The program product may be implemented in any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0149] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0150] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0151] The program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, and the like, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0152] It should be noted that although several modules or units of the device for action execution are mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be concretized in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0153] Furthermore, although the steps of the method of the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0154] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0155] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A relay communication method based on a cellular network terminal, characterized in that: Applied to base stations, including: After a first time period has passed since the initial excitation signal was sent to the backscatter device, no upload information fed back by the backscatter device has been received, and relay requirement information is broadcast, the relay requirement information carrying the geographic location of the backscatter device and the relay distance requirement; determining a candidate terminal among the cellular network terminals that meets the distance requirement; Instructing the plurality of candidate terminals to sequentially send pre-excitation signals to the backscatter device within a search time window; receiving a reflected signal of the pre-excitation signal within the search time window, notifying the candidate terminal with the strongest pre-excitation signal as a first relay terminal based on a decoding operation of the reflected signal, the first relay terminal sending a first excitation signal to the backscatter device, the first excitation signal instructing the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station; If the reflected signal is not received within the search time window, a second relay terminal is selected from the cellular network terminals within a second time period that elapses from the end of the search time window, the second relay terminal sending a second excitation signal to the backscatter device, and sending a decoding result of the backscatter signal generated by the backscatter device based on the second excitation signal to the base station; If the decoding result is not received after a third period of time from the end time, the second relay terminal is reselected based on a second distance, where the second distance is the distance between the cellular network terminal and the backscatter device.

2. The relay communication method based on a cellular network terminal according to claim 1, characterized in that: Also includes: determining a first distance between the base station and the backscatter device based on a geographic location of the backscatter device; determining the distance requirement based on the first distance, a first radio propagation parameter of the base station, a second radio propagation parameter of the cellular network terminal, and a power headroom between the base station and the cellular network terminal; The first wireless propagation parameter includes the first excitation signal transmission power and the first wireless propagation model parameter of the base station, and the second wireless propagation parameter includes the second excitation signal transmission power and the second wireless propagation model parameter of the cellular network terminal.

3. The relay communication method based on a cellular network terminal according to claim 2, characterized in that: The determining the distance requirement based on the first distance, a first wireless propagation parameter of the base station, a second wireless propagation parameter of the cellular network terminal, and a power headroom between the base station and the cellular network terminal includes: constructing a distance requirement calculation formula based on the first distance, a first radio propagation parameter of the base station, a second radio propagation parameter of the cellular network terminal, and the power headroom; The distance requirement is determined based on the distance requirement calculation formula, and the distance requirement calculation formula is: ， in, is the first distance, is the first excitation signal transmission power, is the second excitation signal transmission power, and is the first wireless propagation model parameter, and is the second wireless propagation model parameter, is the power margin.

4. The relay communication method based on a cellular network terminal according to claim 2, characterized in that: Also includes: The power headroom is determined based on a power headroom report reported by the cellular network terminal, a first channel estimation parameter between the backscatter device and the base station, and a second channel estimation parameter between the backscatter device and the cellular network terminal.

5. The relay communication method based on a cellular network terminal according to any one of claims 1 to 4, characterized in that: Also includes: receiving, within the search time window, a reflected signal sent by the backscattering device based on the plurality of pre-excitation signals; Based on the decoding operation of the reflected signal, the candidate terminal with the strongest pre-excitation signal is notified to start a first relay mode as a first relay terminal. In the first relay mode, the first relay terminal sends a first excitation signal to the backscatter device, where the first excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station. The starting moment of the search time window is the moment after the first duration has passed.

6. The relay communication method based on a cellular network terminal according to claim 5, characterized in that: Also includes: determining the number of time slots based on the number of candidate terminals; The length of the search time window is determined based on the number of time slots and the time slot duration.

7. The relay communication method based on a cellular network terminal according to claim 5, characterized in that: Notify the second relay terminal to turn on the second relay mode, and the second relay terminal sends a second excitation signal to the backscatter device, where the second excitation signal is used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the second relay terminal, and the second relay terminal sends the decoding result of the backscatter signal to the base station.

8. The relay communication method based on a cellular network terminal according to claim 7, characterized in that: The selecting a second relay terminal from the cellular network terminals includes: Obtaining terminal location information reported by the cellular network terminal; detecting a second distance between the cellular network terminal and the backscatter device based on the geographic location and the terminal location information; The cellular network terminal having the smallest second distance is selected as the second relay terminal.

9. The relay communication method based on a cellular network terminal according to claim 8, characterized in that: Also includes: If the second relay terminal still fails to receive the decoded backscattered signal after the second time period, a system error is reported. The third duration is shorter than the second duration.

10. A relay communication method based on a cellular network terminal, characterized in that: Applicable to cellular network terminals, including: Receiving relay requirement information broadcast by a base station, the relay requirement information carrying the geographic location of the backscatter device and the distance requirement of the relay; If it is determined based on the geographic location and the distance requirement that the relay requirement is met, the relay mode is enabled, wherein if a pre-excitation signal is sent to the backscatter device within the search time window and a first enable notification is received from the base station, the first relay mode is enabled, the first enable notification being generated based on a reflection signal of the pre-excitation signal from the backscatter device received by the base station; a first excitation signal is sent to the backscatter device, the first excitation signal being used to instruct the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station; if a second enable notification is received from the base station, the second relay mode is enabled; in the second relay mode, a second excitation signal is sent to the backscatter device, the second excitation signal being used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the cellular network terminal; the backscatter signal is decoded and a decoding result is sent to the base station; if the base station does not receive the decoding result after a third time period from the end of the search time window, the second relay terminal is reselected based on a second distance, where the second distance is the distance between the cellular network terminal and the backscatter device.

11. The relay communication method based on a cellular network terminal according to claim 10, characterized in that: If it is determined based on the geographical location and the distance requirement that the relay requirement is met, starting the relay mode includes: determining a second distance between the cellular network terminal and the backscatter device based on the geographic location; If the second distance is less than the distance requirement, a pre-excitation signal is sent to the backscatter device.

12. The relay communication method based on a cellular network terminal according to claim 11, characterized in that: The pre-energization signal includes identification information of the cellular network terminal.

13. The relay communication method based on a cellular network terminal according to claim 11, characterized in that: The sending of a pre-excitation signal to the backscattering device comprises: performing a modulo operation on the identification information of the cellular network terminal based on the number of time slots in the search time window sent by the base station; A time slot number in the search time window is determined based on a modulo operation result, so as to send the pre-excitation signal based on the time slot number.

14. An auxiliary communication device based on a cellular network terminal, applied to a base station, characterized in that: include: a broadcast module configured to broadcast relay requirement information after a first time period has passed since an initial excitation signal was sent to a backscatter device and no upload information fed back by the backscatter device has been received, the relay requirement information carrying a geographic location of the backscatter device and a distance requirement for relaying; determining a candidate terminal among the cellular network terminals that meets the distance requirement; Instructing the plurality of candidate terminals to sequentially send pre-excitation signals to the backscatter device within a search time window; receiving a reflected signal of the pre-excitation signal within the search time window, notifying the candidate terminal with the strongest pre-excitation signal as a first relay terminal based on a decoding operation of the reflected signal, the first relay terminal sending a first excitation signal to the backscatter device, the first excitation signal instructing the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station; If the reflected signal is not received within the search time window, a second relay terminal is selected from the cellular network terminals within a second time period that elapses from the end of the search time window, the second relay terminal sending a second excitation signal to the backscatter device, and sending a decoding result of the backscatter signal generated by the backscatter device based on the second excitation signal to the base station; If the decoding result is not received after a third period of time from the end time, the second relay terminal is reselected based on a second distance, where the second distance is the distance between the cellular network terminal and the backscatter device.

15. A relay communication device based on a cellular network terminal, characterized in that: Applicable to cellular network terminals, including: A receiving module, configured to receive relay requirement information broadcast by a base station, wherein the relay requirement information carries the geographical location of the backscatter device and the distance requirement of the relay; The relay module is configured to enable a relay mode if it is determined that the relay requirement is met based on the geographic location and the distance requirement, wherein the first relay mode is enabled if a pre-excitation signal is sent to the backscatter device within a search time window and a first enable notification is received from a base station, the first enable notification being generated based on a reflection signal of the pre-excitation signal from the backscatter device received by the base station; a first excitation signal is sent to the backscatter device, the first excitation signal being used to instruct the backscatter device to send a backscatter signal generated based on the first excitation signal to the base station; and a second relay mode is enabled if a second enable notification is received from the base station; in the second relay mode, a second excitation signal is sent to the backscatter device, the second excitation signal being used to instruct the backscatter device to send a backscatter signal generated based on the second excitation signal to the cellular network terminal; and decoding the backscatter signal and sending a decoding result to the base station. If the base station does not receive the decoding result after a third time period from the end of the search time window, the second relay terminal is reselected based on a second distance, where the second distance is the distance between the cellular network terminal and the backscatter device.

16. A network device, characterized in that: include: processor; as well as a memory for storing executable instructions of the processor; The processor is configured to execute the relay communication method based on a cellular network terminal according to any one of claims 1 to 9 by executing the executable instructions.

17. A terminal, characterized in that: include: processor; as well as a memory for storing executable instructions of the processor; The processor is configured to execute the relay communication method based on a cellular network terminal according to any one of claims 10 to 13 by executing the executable instructions.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the relay communication method based on a cellular network terminal according to any one of claims 1 to 13 is implemented.

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