A wireless signal transmission method and apparatus

Abstract

The application discloses a wireless signal transmission method, comprising the following steps: transmitting an incident signal within a set resource time length; a first transmission time delay exists in the process of the incident signal reaching a receiving end; a reverse signal is a scattered signal in response to the incident signal, and a second transmission time delay exists in the process of the reverse signal reaching a target end; the time length of the incident signal and / or the reverse signal is set so that the reverse signal reaching the target end is within the set resource time length. The application also comprises a device applying the method. The application solves the timing problem of a reverse scattering communication device transmitting a signal in a mobile communication network, so as to meet the index requirements of the system in terms of inter-code interference and inter-channel interference, and is especially suitable for a system of reverse scattering communication.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication technology, and in particular to a wireless signal transmission method and device. BACKGROUND

[0002] Time synchronization is critical in OFDM-based cellular mobile communication systems. One important feature of uplink transmission is that different user equipments (UEs) are orthogonal in time and frequency domain, i.e. uplink transmissions from different UEs in the same cell do not interfere with each other. In order to guarantee the orthogonality of uplink transmission and avoid intra-cell interference, it is required that the time of arrival of signals from the same time range but different frequency domain resources at the network device is substantially aligned.

[0003] Due to the cyclic prefix (CP) guard interval inserted between OFDM symbols, the start time of OFDM symbol timing synchronization varies within the guard interval and does not cause inter-symbol and inter-channel interference. The network device can correctly decode the uplink data as long as it receives the uplink data transmitted by the UE within the cyclic prefix range.

[0004] In order to guarantee time synchronization at the receiving side, the cellular mobile communication system uses uplink timing advance (TA) mechanism. From the perspective of the UE, TA is essentially a negative offset between the start time of the received downlink subframe and the time of transmitting the uplink subframe. The network device can control the time of arrival of uplink signals from different UEs at the eNode B by appropriately controlling the offset of each UE. For UEs farther away from the network device, due to the larger transmission delay, the UE sends uplink data earlier than UEs closer to the network device. Different UEs have different uplink TAs, i.e. the uplink TA is configured at the UE level. A UE in uplink out-of-sync state can still receive downlink data, but cannot transmit uplink data.

[0005] The main function of the data communication link in the tag circuit of the backscatter communication device is to modulate its own information to the received incident signal, without actively generating a radio frequency signal. For the backscatter communication device, the incident signal and the backscatter signal are transmitted in pairs. Backscatter communication transmission has the characteristic of immediacy: after the tag circuit receives the radio frequency signal, it cannot store the signal, but modulates its own signal to the radio frequency signal and transmits the backscatter signal within a short time. The time of the process of processing the incident signal, modulating the own signal and transmitting the reflected signal is usually in the order of nanoseconds. Therefore, the time of the tag circuit to transmit the signal is related to the time of obtaining the incident signal. The device of the tag circuit cannot determine the transmission time according to the timing advance between the start time of the downlink subframe and the time of transmitting the uplink subframe in the prior art. As a result, inter-code interference or inter-channel interference occurs between backscatter communication devices, or between backscatter communication devices and mobile communication devices. SUMMARY

[0006] The application provides a wireless signal transmission method and device, which solves the timing problem of a backscatter communication device sending a signal in a mobile communication network, and meets the index requirements of the system in terms of inter-symbol interference and inter-channel interference, and is particularly suitable for a system of backscatter communication.

[0007] In a first aspect, the application provides a wireless signal transmission method, comprising the following steps:

[0008] Within a set resource time length, an incident signal is sent; the process of the incident signal reaching a receiving end has a first transmission delay;

[0009] The backscatter signal is a scattered signal in response to the incident signal, and the process of the backscatter signal reaching a target end has a second transmission delay;

[0010] The time length of the incident signal and / or the backscatter signal is set so that the backscatter signal reaching the target end is within the set resource time length.

[0011] Preferably, the difference between the set resource time length and the time length of the incident signal is a first difference value; the difference between the time length of the incident signal and the time length of the backscatter signal is a second difference value. The sum of the first difference value and the second difference value is not less than the sum of the first transmission delay and the second transmission delay.

[0012] Further preferably, the first difference value is 0, or the second difference value is 0.

[0013] Further, the sum of the first difference value and the second difference value is not less than a reference value, and the reference value is the maximum value of the sum of the first transmission delay and the second transmission delay.

[0014] Further, the method comprises the following steps:

[0015] Configuration information is sent or received, and the configuration information is used to set the length of the incident signal and / or the backscatter signal. Preferably, the configuration information is used to set the first difference value and / or the second difference value.

[0016] Preferably, the incident signal and / or the backscatter signal comprises a cyclic prefix (CP) with a length not less than the sum of the maximum multipath delay of the reflected signal and the incident signal, the first transmission delay and the second transmission delay.

[0017] Further, the first difference value and / or the second difference value is an integer multiple of the OFDM symbol time length.

[0018] Preferably, the configuration information is broadcast information, multicast information or unicast information.

[0019] Preferably, the method according to any one of the embodiments of the first aspect of the present application is used in a backscatter device, and comprises the following steps:

[0020] obtaining configuration information, the configuration information being used to determine a target time difference;

[0021] setting a time length of the incident signal and / or the backscatter signal with the target time difference, so that the backscatter signal reaching the target end is within the time length of the set resource;

[0022] modulating target information in the incident signal to generate the backscatter signal.

[0023] Preferably, the target time difference is a first difference, a second difference, or a sum of the first difference and the second difference; the first difference is a difference between the time length of the set resource and the time length of the incident signal; and the second difference is a difference between the time length of the incident signal and the time length of the backscatter signal.

[0024] Preferably, the target time difference is not less than a reference time delay, and the reference time delay is a sum of the first transmission time delay and the second transmission time delay.

[0025] Further, the method further comprises the following steps: starting a target timer, and receiving the configuration information in the broadcast or multicast information when the target timer expires to determine a new target time difference.

[0026] Preferably, in the method according to any one of the embodiments of the present application, the backscatter signal comprises response information of the configuration information.

[0027] Preferably, in the method according to any one of the embodiments of the present application, the target information comprises an identifier of the backscatter device.

[0028] Preferably, the method according to any one of the embodiments of the first aspect of the present application is used in a control device, and comprises the following steps:

[0029] sending configuration information, the configuration information being used to determine a target time difference;

[0030] the target time difference is used to set a time length of the incident signal and / or the backscatter signal, so that the backscatter signal reaching the target end is within the time length of the set resource.

[0031] In a second aspect, the present application further provides a backscatter device for implementing the method according to any one of the embodiments of the present application, and the backscatter device comprises at least one module, and each of the modules is used for at least one of the following functions:

[0032] obtaining configuration information, the configuration information being used to determine a target time difference;

[0033] The target time difference is used to set a time length of the incident signal and / or the backscattering signal, so that the backscattering signal reaching the target end is within the time length of the set resource.

[0034] The target information is modulated in the incident signal to generate the backscattering signal.

[0035] In a third aspect, the application further provides a control device for implementing the method of any one of the embodiments of the application. The control device comprises at least one module, and each of the modules is configured to perform at least one of the following functions:

[0036] The configuration information is used to determine the target time difference.

[0037] The target time difference is used to set a time length of the incident signal and / or the backscattering signal, so that the backscattering signal reaching the target end is within the time length of the set resource.

[0038] Preferably, in any one of the embodiments of the application, the configuration information is unicast information comprising indication information of one backscattering device to be set, or the configuration information is groupcast or multicast information comprising indication information of any one backscattering device; and the indication information is used to determine the target time difference.

[0039] In any one of the embodiments of the application, the target end is located at the sending end of the incident signal, or the target end is a backscattering signal receiving end synchronized with the receiving time of the incident signal sending end.

[0040] In a fourth aspect, the application further provides a communication device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of the method according to any one of the embodiments of the first aspect of the application are implemented.

[0041] In a fifth aspect, the application further provides a computer readable medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method according to any one of the embodiments of the first aspect of the application are implemented.

[0042] In a sixth aspect, the application further provides a mobile communication system, which comprises at least one backscattering device according to any one of the embodiments of the second aspect of the application and / or at least one control device according to any one of the embodiments of the third aspect of the application.

[0043] The above at least one technical solution adopted by the embodiments of the application can achieve the following beneficial effects:

[0044] The timing problem of the signal sent by the backscatter communication device in the mobile communication network is solved. According to the timeliness of the signal sent by the backscatter device, the time length of the incident signal and / or the reflected signal is set, so that the backscattered signal reaching the sending target end is within the time length of the set resource, and the inter-code interference or inter-channel interference between the backscatter communication devices or between the backscatter communication device and the mobile communication device can be reduced or avoided, so as to meet the index requirements of the system in the inter-code interference and the inter-channel interference. BRIEF DESCRIPTION OF DRAWINGS

[0045] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0046] Figure 1 The tag circuit for backscatter communication;

[0047] Figure 2 The schematic diagram for the synchronization problem of backscatter communication;

[0048] Figure 3 The flowchart of the embodiment of the method of the present application;

[0049] Figure 4 The schematic diagram for reducing the time period of the backscattered signal within the time length of the set resource;

[0050] Figure 5 The schematic diagram for reserving the protection time period of the incident signal within the time length of the set resource;

[0051] Figure 6 The flowchart of the embodiment of the method of the present application for controlling the device;

[0052] Figure 7 The flowchart of the embodiment of the method of the present application for the backscatter device;

[0053] Figure 8 The schematic diagram for the synchronization solution of backscatter communication;

[0054] Figure 9 The schematic diagram of the embodiment of the control device;

[0055] Figure 10 The schematic diagram of the embodiment of the backscatter device;

[0056] Figure 11 The schematic diagram of the structure of the control device of another embodiment of the present application;

[0057] Figure 12 The block diagram of the backscatter device of another embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0059] OFDMA is often used in a multiple access mode of a mobile communication system. Backscatter communication devices can share frequencies or adjacent frequencies with the mobile communication system. The present application avoids channel interference between multiple backscatter communication devices and intersymbol interference between backscatter signals and other mobile communication devices by controlling the transmission time of incident signals or the time of transmitting backscatter signals by the backscatter communication devices, so as to meet the index requirements of intersymbol interference and channel interference of the system.

[0060] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0061] Backscatter communication modulates its own data information onto the electromagnetic waves in the surrounding environment. Since it does not need to actively generate radio frequency signals, a large number of high-power active devices can be eliminated. The backscatter communication device does not need to reserve much power for transmitting signals. In addition, the transmission power of backscatter communication is low, and the energy in the wireless propagation environment can be stored in the power supply link of the backscatter communication device through an energy collection circuit, which is expected to further reduce the power consumption demand of communication, and even to realize battery-free communication.

[0062] Figure 1 A schematic diagram of a backscatter communication tag circuit is shown, which includes a data communication link and an energy collection link. In the data communication link, the tag circuit receives a radio frequency signal, modulates its own information onto the received incident signal, and transmits a backscattered signal. The modulation method of backscattering can be FSK, QAM, or a combination of FSK and QAM, etc. In the energy collection link, the tag circuit receives a radio frequency signal and stores the collected energy in the power supply link. The backscatter communication device actively senses data when it does not transmit a radio frequency signal, and has the ability of simple calculation.

[0063] Figure 2 A schematic diagram of a backscatter communication synchronization problem is shown.

[0064] The incident signal needs a transmission delay D1 from the sending end to the backscatter communication device. After the backscatter device obtains the incident signal, the transmission delay from modulating and sending the modulated back signal to the receiving device is D2. According to the different propagation distances between the backscatter device and the sending device of the incident signal, and the different propagation distances between the backscatter device and the receiving device of the back signal, the time difference of the back signal of different devices reaching the receiving device is D1+D2. Figure 2 The incident signal is used by the backscatter communication devices UE1, UE2, and UE3 on the same resource. The corresponding D1+D2 of UE1 is small and can be ignored. The corresponding D1+D2 of UE2 is larger. The corresponding D1+D2 of UE3 is the largest. The incident is sent from t0. It reaches UE1 at t0, UE2 at t1, and UE3 at t3. If UE1 sends the back signal modulated by its own signal from t0, the back signal reaches UE1 at t0. Similarly, if UE2 and UE3 send the back signal modulated by their own signal after receiving the incident signal, the back signals of UE2 and UE3 reach the receiving device at t2 and t4, respectively. If the time difference between t0, t2, and t4 is large, the back signals of UE1, UE2, and UE3 will cause inter-channel interference on the receiving side. And it may cause inter-symbol interference with other mobile communication devices in other time periods.

[0065] Figure 3 The flowchart of an embodiment of the method of the present application.

[0066] The present application provides a wireless signal transmission method, comprising the following steps 101-103:

[0067] Step 101, send an incident signal within a set resource duration; the process of the incident signal reaching the receiving end has a first transmission delay;

[0068] Step 102, the back signal is a scattered signal in response to the incident signal, and the process of the back signal reaching the target end has a second transmission delay;

[0069] The scattered signal is generated by modulating the incident signal with the information to be transmitted.

[0070] Step 103, set the time length of the incident signal and / or the back signal so that the back signal reaching the target end is within the set resource duration.

[0071] The target end refers to the receiving end of the back signal, which can be located at the transmitting end of the incident signal, or can be located at another device. For example, the backscattering communication can be divided into three categories according to the architecture: the first category: single base backscattering communication system, device 1 sends incident signal to device 2, and device 2 sends back signal to device 1. In the first category system, the target end is located at the transmitting end of the incident signal. The second category: double base backscattering communication system, device 3 sends incident signal to device 1, and device 1 sends back signal to device 2. In the second category system, the target end is not located at the transmitting end of the incident signal, but at the receiving end of another device. The third category: environmental backscattering communication system, device 1 uses the wireless signal of other devices in the environment as incident signal, and sends back signal to device 2. In the third category system, the location of the transmitting end of the incident signal is not determined, so the target end only refers to the device receiving the reflected signal.

[0072] In step 103, further comprising the following steps: sending or receiving configuration information, the configuration information is used to set the length of the incident signal and / or the back signal. Preferably, the configuration information is broadcast information, multicast information or unicast information.

[0073] Preferably, in any embodiment of the present application, the configuration information is unicast information, which contains the indication information of one backscattering device for setting, or the configuration information is multicast or multicast information, which contains the indication information of any backscattering device; the indication information is used to determine the target time difference. Before the backscattering communication device accesses the network, the network device cannot send special configuration information to the device. The backscattering device also cannot actively generate the radio frequency signal of the random access signal. At this time, the backscattering communication device generates the back signal by modulating the public incident signal to carry its own random access information. In the case that each of a plurality of backscattering communication devices modulates the target information to the incident signal obtained by itself and sends the corresponding back signal, the target time difference is common to the plurality of backscattering communication devices. At this time, the target time difference is subject to the maximum value greater than the sum of the incident signal transmission time delay and the back signal transmission time delay of the plurality of backscattering communication devices. Each backscattering communication device obtains the configuration information from the broadcast or multicast information. After the backscattering communication device establishes synchronization with the network device through the back signal, special configuration information can be sent to the backscattering communication device, the target time difference of the backscattering communication device is adjusted and updated, and the efficiency of the backscattering communication is improved.

[0074] Preferably, the difference between the length of the set resource and the length of the incident signal is a first difference value; the difference between the length of the incident signal and the length of the back signal is a second difference value. The sum of the first difference value and the second difference value is not less than the sum of the first transmission time delay and the second transmission time delay.

[0075] Further, the sum of the first difference value and the second difference value is not less than a reference value, the reference value being the maximum of the sum of the first transmission delay and the second transmission delay.

[0076] Preferably, the length of the target time difference is K OFDM symbol durations, where K≥1. The frequency resources of the reverse signal can have OFDM symbol information of other devices on adjacent resources, and the target time difference is an integer number of OFDM symbols, which ensures that the target information carried in the reverse signal does not interfere with the signals of other devices on adjacent frequency resources.

[0077] Further preferably, the configuration information is used to set the first difference value and / or the second difference value. Further, the first difference value and / or the second difference value is an integer multiple of the OFDM symbol duration.

[0078] Further preferably, the incident signal and / or the reverse signal includes a cyclic prefix (CP) with a length not less than the sum of the maximum multipath delay of each of the reflected signal and the incident signal, the first transmission delay, and the second transmission delay. For example, as shown in Figure 2 In order to overcome the interference between reverse signals between reverse scattering communication devices using the same resource for incident signals, the incident signal includes a CP with a length not less than the sum of the maximum multipath delay of each of the incident signal and the reverse signal during transmission and D1+D2. In the case where the incident signal in the set resource is used for multiple reverse scattering devices, the length of the CP is not less than the sum of the maximum multipath delay of each of the incident signal and the reverse signal during transmission and the maximum of D1+D2.

[0079] Figure 4 A schematic diagram of reducing the time period of the reverse signal within the set resource duration.

[0080] For example, in scheme one, when the first difference value is 0, the sum of the first difference value and the second difference value is not less than the sum of the first transmission delay and the second transmission delay, i.e., the second difference value is not less than the sum of the first transmission delay and the second transmission delay.

[0081] As shown in Figure 4 The transmission time of the reverse signal can be limited to generate the second difference value. After obtaining the incident signal, the reverse scattering communication device does not modulate its own signal and transmit the reverse signal at all times of the incident signal, but generates and transmits the reverse signal at part of the time period of the incident signal, so as to avoid the arrival of other signals at the receiving device at the same time as the arrival of the reverse signal at the receiving device. The second difference value needs to be updated with the movement of the device and the change of the communication environment, and the update can be performed by a control device or a reverse scattering device.

[0082] Figure 5 A schematic diagram illustrating the protection period for the incident signal within a set resource duration.

[0083] For example, in Scheme 2, when the second difference is 0, the sum of the first difference and the second difference is not less than the sum of the first transmission delay and the second transmission delay, that is, the first difference is not less than the sum of the first transmission delay and the second transmission delay.

[0084] Assume the transmitter of the incident signal and the receiver of the reverse signal are time-synchronized. Alternatively, the transmitter and receiver of the incident signal are the same device. To generate the first difference, a protection period is set after the incident signal. During the protection period, the transmitter of the incident signal does not send any information, thus limiting the transmission time of the incident signal. The length of the protection period is no less than the maximum value of D1 + D2, ensuring that all reverse signals arrive at the receiver by the end of the protection period. No other device signals arrive at the receiver of the reverse signal during the protection period, ensuring that the reverse signal does not interfere with other devices' signals.

[0085] In addition, Figure 4-5 In some embodiments, in order to overcome interference between backscatter communication devices using the same resources, a CP may be included in the starting segment of the incident signal or the reverse signal, and the length of the CP shall not be less than the sum of the maximum multipath delay and the maximum value of D1+D2.

[0086] Figure 6 This is a flowchart illustrating an embodiment of the method used in this application for controlling a device.

[0087] The method described in any of the foregoing embodiments of this application, used for a control device of a backscatter communication device, includes the following steps 201-203:

[0088] Step 201: Send multicast or multicast information, which includes configuration information used to determine the target time difference of any backscattering device receiving the configuration information.

[0089] The target time difference is used to set the time length of the incident signal and / or the reverse signal, so that the reverse signal arriving at the target end is within the time of the set resource.

[0090] Step 202: Receive the reverse signal according to the set reverse signal duration; the reverse signal contains a response to the configuration information; identify the identification information in the reverse signal;

[0091] Step 203: Based on the identification information, send unicast information to the designated backscattering device. The unicast information includes configuration information, which is used to determine the target time difference of the designated backscattering device.

[0092] Figure 7 The method of any one of the preceding embodiments is used for a backscatter device.

[0093] The method of any one of the preceding embodiments is used for a backscatter device, and comprises at least the following steps 301-303:

[0094] Step 301, obtaining configuration information, the configuration information is used to determine a target time difference;

[0095] Preferably, the target time difference is not less than a reference time delay, the reference time delay is the sum of the first transmission time delay and the second transmission time delay. In particular, the reference time delay is the maximum value of the sum of the transmission time delay of the incident signal and the transmission time delay of the backscatter signal.

[0096] It should be noted that the set resource comprises N preset time unit lengths in time. The backscatter device determines the set resource in advance through another configuration information. The preset time unit length is the time granularity of data transmission in a mobile communication network. For example, it is a time slot, a subframe, or a sub-time slot. The incident signal is an incident signal sent in the set resource.

[0097] Step 302, setting the time length of the incident signal and / or the backscatter signal with the target time difference, so that the backscatter signal reaching the target end is within the time length of the set resource;

[0098] Preferably, the target time difference is a first difference value, a second difference value, or the sum of the two; the first difference value is the difference between the time length of the set resource and the time length of the incident signal; and the second difference value is the difference between the time length of the incident signal and the time length of the backscatter signal.

[0099] It should be noted that when the first difference value exists, the end time of the incident signal is not the end time of the set resource. The incident signal ends before the end time of the set resource, which means that the end time of the backscatter signal in the receiving device is advanced. In this way, the conflict and interference of the backscatter signal with other time signals can be reduced. Alternatively, when the second difference value exists, the difference between the time length of the incident signal and the time length of the backscatter signal is greater than zero, even if the end time of the incident signal is the same as the end time of the set resource. After the backscatter communication device detects the incident signal, the target information of the backscatter communication device is modulated to the front part of the incident signal, which is equivalent to advancing the end time of the backscatter signal in the receiving device, and the conflict and interference of the backscatter signal with other time signals can be reduced.

[0100] Step 303, receiving the incident signal and generating the backscatter signal;

[0101] In step 303, first, the incident signal is detected within the set resource time length; then, the target information is modulated in the incident signal to generate the reverse signal.

[0102] In particular, the resource of the incident signal is selected in the set resource in a preset manner. If the incident signal of the same time frequency in the set resource is used for the incident signal of multiple backscatter devices, the receiving device of the reverse signal needs to distinguish from which backscatter communication device each reverse signal comes. In this case, the incident signals of multiple backscatter communication devices can be distinguished by different sequences. For example, the multiple incident signals are different cyclic shifts of Zadoff-Chu sequences, or different cyclic shifts of m sequences, or Zadoff-Chu sequences jointly spread by different cyclic shifts of m sequences. The backscatter communication device can detect the incident signal in the set resource. After detecting the incident signal, the target information is modulated to the incident signal, and the corresponding reverse signal is sent. Considering the low power consumption and low cost characteristics of the backscatter communication device, it may not have the ability to detect all incident signals in the set resource. In this case, the backscatter communication device can randomly determine one incident signal in the set resource as the incident signal and detect it. If the detection is successful, the device modulates the target information to the incident signal and sends the corresponding reverse signal. If the detection is not successful, the device determines the incident signal to be detected again and detects it on other set resources.

[0103] Preferably, in any one of the embodiments of the present application, the reverse signal contains the response information of the configuration information. With the movement of the device and the change of the wireless communication environment, it is necessary to adjust the value of the target time difference to maintain the timing of the backscatter communication device sending the reverse signal. Therefore, the backscatter communication device feeds back whether the configuration information is correctly acquired through the reverse signal, so that the device for timing maintenance determines the target time difference currently in effect of the backscatter communication device.

[0104] Preferably, in any one of the embodiments of the present application, the target information contains the identification of the backscatter device. The backscatter communication device generates a reverse signal by modulating a public incident signal to carry its random access information. At this time, the target information contains the identification information of the device.

[0105] Further, the following step 304 is also contained:

[0106] Step 304, start the target timer, when the target timer is timed out, receive the configuration information in the broadcast or multicast information, and determine the new target time difference.

[0107] After obtaining the configuration information for the backscatter communication device, the device can start a target timer. After the target timer expires, the device is out of its timing accuracy range. The device transmits the backscatter signal with the random access information according to a new target time difference determined by the device based on the configuration information transmitted in the broadcast or groupcast information to ensure that the backscatter signal carrying the random access information does not interfere with or conflict with other time information at the receiving end.

[0108] It should be noted that the base station should generally update the configuration information for the terminal before the timer expires. However, if the terminal has not received the updated configuration value from the base station even after the timer expires, it indicates that the base station and the terminal have lost connection, and the backscatter signal should be determined according to the maximum configuration value (the common configuration information for all terminals in the broadcast message).

[0109] Figure 8 A schematic diagram of a backscatter communication synchronization solution is shown. The incident signal ends before the end time of the set resource, and the time difference between the incident signal and the end time of the set resource is the guard time. No incident signal is transmitted during the guard time period. In the case where the transmission delay of the incident signal from the transmitting device to the backscatter communication device is D1 and the propagation delay of the backscatter signal is D2, if the length of the guard time period is not less than D1 + D2, the time at which the backscatter signal reaches the receiving device is not later than the end time of the set resource. The length of the set resource is N preset time unit lengths. Signals from other devices are scheduled on other resources outside the set resource, which ensures that the backscatter signal does not conflict with or interfere with signals at other times. As shown in the figure, the backscatter communication device UE detects the incident signal at t1 and transmits the backscatter signal modulated by its own signal at t1. The backscatter signal reaches the receiving end at t2. The transmitting end of the incident signal and the receiving end of the backscatter signal are synchronized in time. Assuming that the time difference between the end time of the incident signal and the end time of the set resource is the guard period. If the length of the guard period is not less than the sum of the transmission delay of the incident signal and the transmission delay of the backscatter signal t2-t0, it can be ensured that the backscatter signal reaches the receiving device at the end time of the set resource and does not interfere with signals at other times outside the set resource.

[0110] Similarly, the difference between the duration of the incident signal and the duration of the backscatter signal can be limited to be not less than the sum of the transmission delay of the incident signal and the transmission delay of the backscatter signal. That is, the backscatter signal only corresponds to the time before the incident signal, which can ensure that the backscatter signal reaches the receiving device at the end time of the set resource and does not interfere with signals at other times outside the set resource.

[0111] The length of the protection time period is not less than the maximum of D1+D2 of each of the multiple backscatter devices, which can ensure that the backscatter signals do not conflict and interfere with signals of other time. Figure 2 In the example shown, the backscatter communication devices UE1, UE2, and UE3 use incident signals on the same resource. D1+D2 corresponding to UE1 is very small and can be ignored. D1+D2 corresponding to UE2 is larger. D1+D2 corresponding to UE3 is the largest. If the length of the protection time period is not less than the maximum of D1+D2 of each of the multiple backscatter devices, it can be ensured that the backscatter signals do not conflict and interfere with signals of other time.

[0112] Figure 9 An embodiment schematic diagram of a control device.

[0113] The application also proposes a control device for implementing the method described in any one of the embodiments of the application. The control device comprises at least one module, and each of the modules is configured to perform at least one of the following functions: sending configuration information, the configuration information being used to determine a target time difference; and the target time difference being used to set the time length of the incident signal and / or the backscatter signal, so that the backscatter signal reaching the target end is within the time length of the set resource.

[0114] For example, to implement the above technical solution, the application proposes a control device 400, which comprises a first sending module 401, a first determining module 402, and a first receiving module 403.

[0115] The first sending module is configured to send configuration information, and the configuration information is used to determine a target time difference, for example, to determine the target time difference of the set backscatter device, or the configuration information is used to determine the target time difference of any one of the backscatter devices receiving the configuration information.

[0116] The first determining module is configured to determine the configuration information and identify the identification information in the backscatter signal.

[0117] The first receiving module is configured to receive the backscatter signal according to the time length of the set backscatter signal, and the backscatter signal contains a response to the configuration information.

[0118] The specific method for implementing the functions of the first sending module, the first determining module, and the first receiving module is described in the method embodiments of the application, which will not be described here.

[0119] Figure 10 An embodiment schematic diagram of a backscatter device.

[0120] The application further provides a backscattering device for implementing the method of any one of the embodiments of the application, the backscattering device comprising at least one module, each of the modules being configured to perform at least one of the following functions: obtaining configuration information used to determine a target time difference; setting a time length of an incident signal and / or a backscattered signal using the target time difference, so that the backscattered signal reaching a target end is within the set time length of the resource; and modulating target information in the incident signal to generate the backscattered signal.

[0121] For example, to implement the above technical solution, the application provides a backscattering device 500, comprising a second sending module 501, a second determining module 502, and a second receiving module 503.

[0122] The second receiving module is configured to obtain configuration information used to determine a target time difference, and further configured to receive an incident signal.

[0123] The second determining module is configured to determine a target time difference according to the configuration information.

[0124] The second sending module is configured to send the backscattered signal.

[0125] The specific methods for implementing the functions of the second sending module, the second determining module, and the second receiving module are described in the method embodiments of the application, and thus will not be described here.

[0126] Figure 11 Fig. 6 shows a structural schematic diagram of a control device according to another embodiment of the application. As shown in the figure, the control device 600 comprises a processor 601, a wireless interface 602, and a memory 603. The wireless interface can be a plurality of components, i.e., comprising a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium. The wireless interface implements the communication function of the backscattering device, processes wireless signals through receiving and transmitting devices, and the data carried by the signals is communicated with the memory or the processor via an internal bus structure. The memory 603 comprises a computer program for implementing any one of the embodiments of the application, which is run or changed on the processor 601. The memory, the processor, and the wireless interface circuit are connected through a bus system. The bus system comprises a data bus, a power bus, a control bus, and a state signal bus, which will not be described here.

[0127] Figure 12is a block diagram of a backscatter device according to another embodiment of the present application. The backscatter device 700 includes at least one processor 701, a memory 702, and at least one network interface 704. The various components in the backscatter device 700 are coupled together by a bus system. The bus system is used to facilitate communication between the components. The bus system includes a data bus, a power bus, a control bus, and a state signal bus.

[0128] The memory 702 stores the executable modules or data structures. The processor 701 reads information in the memory 702 and, in conjunction with its hardware, completes the steps of the above method. Specifically, the computer program stored on the computer readable storage medium is executed by the processor 701 to implement each step of the method embodiments according to any one of the above embodiments.

[0129] Figure 11-12 The processor 601, 701 in the above embodiments can be an integrated circuit chip with a signal processing capability. In the implementation process, each step of the above method can be completed by hardware integrated logic circuit or software form of instructions in the processor 601, 701. The processor 601, 701 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. Each method, step and logic block diagram disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as a hardware code processor to execute, or a combination of hardware and software modules in the code processor to execute.

[0130] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. In one typical configuration, the device of the present application includes one or more processors (CPU), input / output user interfaces, network interfaces, and memories.

[0131] In addition, the present application can take the form of a computer program product embodied in one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) having computer-usable program code embodied therein.

[0132] Therefore, the present application also proposes a computer readable medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the method according to any one of the embodiments of the present application. For example, the memory 603, 702 of the present application can include a non-permanent memory in the computer readable medium, such as a random access memory (RAM) and / or a non-volatile memory, etc., such as a read-only memory (ROM) or a flash memory (flash RAM).

[0133] Based on the embodiments of the present application, the present application also proposes a mobile communication system, which includes at least one embodiment of the backscattering device of the present application and / or at least one embodiment of the control device of the present application. Figure 9-12

[0134] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0135] It should also be noted that "first", "second" in the present application are used to distinguish multiple objects with the same name, and have no other special meanings if not specifically stated.

[0136] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.​

Claims

1. A wireless signal transmission method, characterized in that, Includes the following steps: Within the set duration of the resource, an incident signal is transmitted; the process of the incident signal reaching the backscattering device involves a first transmission delay; the difference between the set duration of the resource and the duration of the incident signal is a first difference value. The reverse signal is a scattered signal in response to the incident signal, and there is a second transmission delay in the process of the reverse signal reaching the target end; the difference between the duration of the incident signal and the duration of the reverse signal is the second difference value; The configuration information includes indication information for determining the target time difference, which is a first difference, a second difference, or the sum of the two. The duration of the incident signal and / or the reverse signal is set such that the reverse signal arriving at the target end is within the duration of the set resource, wherein the sum of the first difference and the second difference is not less than the sum of the first transmission delay and the second transmission delay.

2. The method as described in claim 1, characterized in that, Start the target timer. When the target timer expires, determine a new target time difference based on the configuration information in the broadcast or multicast information.

3. The method as described in claim 2, characterized in that, The first difference is 0, or the second difference is 0.

4. The method as described in claim 2, characterized in that, The sum of the first difference and the second difference is not less than a reference value, which is the maximum value of the sum of the first transmission delay and the second transmission delay.

5. The method as described in claim 1, characterized in that, Send or receive configuration information, which is used to set the length of the incident signal and / or the reverse signal.

6. The method as described in claim 2, characterized in that, Sending or receiving configuration information, the configuration information being used to set the first difference and / or the second difference.

7. The method as described in claim 1, characterized in that, The incident signal and / or the reverse signal includes a cyclic prefix CP, the length of which is not less than the sum of the maximum multipath delay, the first transmission delay, and the second transmission delay of each of the reverse signal and the incident signal.

8. The method as described in claim 2, characterized in that, The first difference and / or the second difference are integer multiples of the OFDM symbol duration.

9. The method as described in claim 5, characterized in that, The configuration information can be broadcast information, multicast information, or unicast information.

10. The method as described in claim 1, characterized in that, The target end is located at the transmitting end of the incident signal, or the target end is a reverse signal receiving end that is synchronized with the receiving time of the transmitting end of the incident signal.

11. The method according to any one of claims 1 to 10, used in a backscattering device, characterized in that, Includes the following steps: Obtain configuration information, which is used to determine the target time difference; The target time difference is used to set the time length of the incident signal and / or the reverse signal, so that the reverse signal arriving at the target end is within the time of the set resource. The target information is modulated onto the incident signal to generate the reverse signal.

12. The method as described in claim 11, characterized in that, The target time difference is not less than the reference delay, which is the sum of the first transmission delay and the second transmission delay.

13. The method as described in claim 11, characterized in that, Start the target timer. When the target timer expires, receive the configuration information in the broadcast or multicast information to determine the new target time difference.

14. The method as described in claim 11, characterized in that, The reverse signal contains the response information of the configuration information.

15. The method as described in claim 11, characterized in that, The target information includes the identifier of the backscattering device.

16. The method according to any one of claims 1 to 10, used for controlling equipment, characterized in that, Includes the following steps: Send configuration information, which is used to determine the target time difference; The target time difference is used to set the time length of the incident signal and / or the reverse signal, so that the reverse signal arriving at the target end is within the time of the set resource.

17. A backscattering device for implementing the method according to any one of claims 1 to 10, characterized in that, It includes at least one module, each of which performs at least one of the following functions: Obtain configuration information, which is used to determine the target time difference; The target time difference is used to set the time length of the incident signal and / or the reverse signal, so that the reverse signal arriving at the target end is within the time of the set resource. The target information is modulated onto the incident signal to generate the reverse signal.

18. A control device for implementing the method according to any one of claims 1 to 10, characterized in that, It includes at least one module, each of which performs at least one of the following functions: Send configuration information, which is used to determine the target time difference; The target time difference is used to set the time length of the incident signal and / or the reverse signal, so that the reverse signal arriving at the target end is within the time of the set resource.

19. The control device as described in claim 18, characterized in that, The configuration information is unicast information, containing indication information for setting one backscattering device; or, the configuration information is multicast or multi-cast information, containing indication information for any one backscattering device; the indication information is used to determine the target time difference.

20. A communication device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as described in any one of claims 1 to 10.

21. A computer-readable medium, characterized in that, A computer program is stored on the computer-readable medium, which, when executed by a processor, implements the steps of the method as described in any one of claims 1 to 10.

22. A mobile communication system comprising at least one backscattering device as described in claim 17 and / or at least one control device as described in any one of claims 18 to 19.

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