Spectrum sensing method and device for cellular network and communication system

Abstract

The present invention relates to the technical field of wireless communications, and specifically discloses a spectrum sensing method, device and communication system for a cellular network, comprising: acquiring spectrum sensing reserved resource configuration information of a service base station, the spectrum sensing reserved resource configuration information at least comprising reserved time-frequency resources of air interface scheduling; generating spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information, and diffusing the spectrum sensing instruction information to a service terminal guard module through the guard network; the service terminal guard module can sense and monitor a to-be-sensed frequency point in a to-be-sensed frequency range according to the spectrum sensing instruction information; and performing sensing monitoring on a to-be-sensed frequency point in a to-be-sensed frequency range according to the spectrum sensing instruction information. The spectrum sensing method for the cellular network provided by the invention can assist in improving the anti-interference capability of the cellular network.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular, to a spectrum sensing method for a cellular network, a spectrum sensing device for a service base station node, a spectrum sensing device for a service terminal node, and a communication system. Background Art

[0002] Commercial cellular network technologies represented by 5G have significantly changed people's lifestyles and promoted the rapid progress of society with their excellent characteristics such as large bandwidth, low latency, and ultra-large-scale networking. Commercial cellular networks all operate at specific working frequencies, and these frequencies are not allowed to be used by other wireless devices to prevent interference with communication. When applying cellular networks to special fields, due to the lack of anti-interference ability of cellular networks, communication degradation or even service interruption may occur when encountering interference. By identifying interference through spectrum sensing and then coordinating the frequency synchronization switching of the base station and the terminal, interference can be effectively avoided. And if the anti-interference ability is to be improved, it is first necessary to be able to sense and identify the air interface spectrum. There is no existing solution in the prior art on how to sense and identify the air interface spectrum of a cellular network.

[0003] Therefore, how to realize the sensing and identification of the air interface spectrum of a cellular network has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] The present invention provides a spectrum sensing method for a cellular network, a spectrum sensing device for a service base station node, a spectrum sensing device for a service terminal node, and a communication system, which solve the problem of the lack of sensing and identification of the air interface spectrum of a cellular network in the related art.

[0005] As a first aspect of the present invention, there is provided a spectrum sensing method for a cellular network, which is applied to a service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service base station can be communicatively connected to a service terminal in a service terminal node to form a service network, and the service base station guard module can be communicatively connected to a service terminal guard module in a service terminal node to form a guard network. The spectrum sensing method for the cellular network includes: Obtaining spectrum sensing reserved resource configuration information of the service base station, where the spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling; Generate spectrum sensing instruction information according to the reserved resource configuration information for spectrum sensing, and spread the spectrum sensing instruction information to the service terminal guard module through the guard network. The spectrum sensing instruction information at least includes the reserved time-frequency resource positions required for sensing the air interface frequency of the service network and the frequency range to be sensed. The frequency range to be sensed at least includes the frequency point where the air interface frequency of its own service network is located, the frequency points where the air interface frequencies of non-own service networks are located within a preset number of hops, and other candidate frequency points in the service network frequency point set that can be used as the air interface frequency of the service network. The service terminal guard module can perform sensing and monitoring on the candidate frequency points within the frequency range to be sensed according to the spectrum sensing instruction information. Perform sensing and monitoring on the candidate frequency points within the frequency range to be sensed according to the spectrum sensing instruction information.

[0006] Further, performing sensing and monitoring on the candidate frequency points within the frequency range to be sensed according to the spectrum sensing instruction information includes: Determine the reserved time-frequency resource positions required for sensing the air interface frequency of the service network and the frequency range to be sensed according to the spectrum sensing instruction information. Determine the corresponding sensing and monitoring method according to the belonging of the current candidate frequency point within the frequency range to be sensed, and obtain the sensing and monitoring result. The belonging of the current candidate frequency point within the frequency range to be sensed includes any one of the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and other candidate frequency points in the service network frequency point set that can be used as the air interface frequency of the service network.

[0007] Further, determining the corresponding sensing and monitoring method according to the belonging of the current candidate frequency point within the frequency range to be sensed and obtaining the sensing and monitoring result includes: Judge the belonging of the current candidate frequency point within the frequency range to be sensed. If the current candidate frequency point belongs to the frequency point where the current air interface frequency of its own service network is located, or if the current candidate frequency point belongs to the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, then perform sensing and monitoring on the frequency points within the frequency range to be sensed at the reserved time-frequency resource positions, and obtain the sensing and monitoring result. If the current candidate frequency point belongs to other candidate frequency points in the service network set that can be used as the air interface frequency of the service network, then determine the sensing and monitoring method according to whether the current candidate frequency point is affected by the sensing accuracy of the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops.

[0008] Further, if the currently to-be-sensed frequency point belongs to the to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, then determine the sensing monitoring method according to the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops, including: If the currently to-be-sensed frequency point belongs to the to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, determine whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops and the currently to-be-sensed frequency point is less than the preset distance; If it is less than the preset distance, then determine that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops have an impact on the sensing accuracy of the currently to-be-sensed frequency point, perform sensing monitoring on the currently to-be-sensed frequency point at the reserved time-frequency resource position, and obtain the sensing monitoring result; If it is not less than the preset distance, then determine that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops have no impact on the sensing accuracy of the currently to-be-sensed frequency point, start sensing monitoring on the currently to-be-sensed frequency point at any time, and obtain the sensing monitoring result.

[0009] Further, the sensing priority order of the to-be-sensed frequency points within the to-be-sensed frequency range is, from high to low: the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops, the to-be-sensed frequency points in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops is less than the preset distance, and the to-be-sensed frequency points in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within the preset number of hops is not less than the preset distance.

[0010] As another aspect of the present invention, there is provided a spectrum sensing method for a cellular network, where it is applied to a service terminal node, the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal, the service terminal can be communicatively connected to a service base station in a service base station node to form a service network, and the service terminal guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network; the spectrum sensing method for the cellular network includes: Receive the spectrum sensing instruction information sent by the service base station guard module; the service base station guard module can generate spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information of the service base station; Determine the reserved time-frequency resource position and the frequency range to be sensed required for the service network air interface frequency sensing according to the spectrum sensing instruction information; the frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops, and the other frequency points to be sensed that can be used as the service network air interface frequency in the service network frequency point set; Sense and monitor the frequency points to be sensed within the frequency range to be sensed, and obtain the sensing and monitoring results; report the sensing and monitoring results to the service base station guard module through the guard network.

[0011] Further, sensing and monitoring the frequency points to be sensed within the frequency range to be sensed, and obtaining the sensing and monitoring results, including: Judge the attribution of the current frequency point to be sensed within the frequency range to be sensed; If the current frequency point to be sensed belongs to the frequency point where the current air interface frequency of its own service network is located, or if the current frequency point to be sensed belongs to the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops, sense and monitor the frequency points within the frequency range to be sensed at the reserved time-frequency resource position, and obtain the sensing and monitoring results; If the current frequency point to be sensed belongs to the other frequency points to be sensed that can be used as the service network air interface frequency in the service network set, determine the sensing and monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed; Among them, determining the sensing and monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed includes: If the current frequency point to be sensed belongs to the other frequency points to be sensed that can be used as the service network air interface frequency in the service network set, judge whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops and the current frequency point to be sensed is less than the preset distance; If it is less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points other than the frequency point where the current air interface frequency of its own service network is located within the preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed, sense and monitor the current frequency point to be sensed at the reserved time-frequency resource position, and obtain the sensing and monitoring results; If it is not less than the preset distance, it is determined that the frequency points where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequency of the non-own service network is located within the preset number of hops have no impact on the sensing accuracy of the current frequency point to be sensed. At any time, start sensing and monitoring the current frequency point to be sensed, and obtain the sensing and monitoring results.

[0012] As another aspect of the present invention, there is provided a spectrum sensing device for a service base station node, which is used to implement the spectrum sensing method for a cellular network described above. Among them, it is applied to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service base station can be communicatively connected to a service terminal in a service terminal node to form a service network. The service base station guard module can be communicatively connected to a service terminal guard module in a service terminal node to form a guard network. The spectrum sensing device for the service base station node includes: An acquisition module, configured to acquire spectrum sensing reserved resource configuration information of the service base station. The spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling. A generation module, configured to generate spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information, and spread the spectrum sensing instruction information to the service terminal guard module through the guard network. The spectrum sensing instruction information at least includes the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the frequency range to be sensed. The frequency range to be sensed at least includes the frequency points where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequency of the non-own service network is located within the preset number of hops, and other frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network. The service terminal guard module can perform sensing and monitoring on the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information. A first sensing module, configured to perform sensing and monitoring on the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information.

[0013] As another aspect of the present invention, there is provided a spectrum sensing device for a service terminal node, which is used to implement the spectrum sensing method for a cellular network described above. Among them, it is applied to the service terminal node. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal can be communicatively connected to a service base station in a service base station node to form a service network. The service terminal guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network. The spectrum sensing device for the service terminal node includes: A receiving module, configured to receive the spectrum sensing instruction information sent by the service base station guard module; the service base station guard module is capable of generating the spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information of the service base station; A determining module, configured to determine the reserved time-frequency resource positions required for the service network air interface frequency sensing and the frequency range to be sensed according to the spectrum sensing instruction information; the frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequency of non-its own service network is located within a preset number of hops, and the frequency points to be sensed that can be used as the service network air interface frequency in the service network frequency point set; A second sensing module, configured to sense and monitor the frequency points to be sensed within the frequency range to be sensed, and obtain the sensing and monitoring results; A reporting module, configured to report the sensing and monitoring results to the service base station guard module through the guard network.

[0014] As another aspect of the present invention, there is provided a communication system, which includes: A service base station node and a service terminal node communicatively connected to the service base station node; The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station, and the service base station guard module includes the spectrum sensing device for the service base station node described above; The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal, and the service terminal guard module includes the spectrum sensing device for the service terminal node described above; The service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module and the service terminal guard module are communicatively connected to form a guard network.

[0015] The spectrum sensing method for a cellular network provided by the present invention can sense the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information obtained from the spectrum sensing reserved configuration information, so that the air interface spectrum of the cellular network can be sensed and identified through spectrum sensing, which is convenient for assisting in frequency switching to avoid interference when the sensed frequency point is interfered, and thus can effectively improve the anti-interference ability of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the following specific embodiments, but do not constitute a limitation to the present invention.

[0017] Figure 1 It is a structural block diagram of the communication system provided by the present invention.

[0018] Figure 2 Block diagram of the service base station node provided by the present invention.

[0019] Figure 3 Block diagram of the service terminal node provided by the present invention.

[0020] Figure 4 Block diagram of the spectrum sensing device for the service base station node provided by the present invention.

[0021] Figure 5 Flowchart of an implementation manner of the spectrum sensing method for the cellular network provided by the present invention.

[0022] Figure 6 Flowchart of a specific implementation manner of frequency sensing on the service base station side provided by the present invention.

[0023] Figure 7 Flowchart of another specific implementation manner of frequency sensing on the service base station side provided by the present invention.

[0024] Figure 8 Block diagram of the spectrum sensing device for the service terminal node provided by the present invention.

[0025] Figure 9 Flowchart of another implementation manner of the spectrum sensing method for the cellular network provided by the present invention.

[0026] Figure 10 Communication schematic diagram of the service base station node and the service terminal node in the communication system provided by the present invention.

[0027] Figure 11 Flowchart of the specific implementation manner of the spectrum sensing method for the cellular network provided by the present invention.

[0028] Figure 12 Schematic diagram of time-frequency resource allocation during the frequency sensing process provided by the present invention. Specific implementation manner

[0029] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data used can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] Currently, when the cellular network is applied to commercial and other fields, due to its lack of anti-interference ability, when encountering interference, it may cause communication degradation or even service interruption.

[0033] Based on this, in the embodiments of the present invention, a communication system 10 is provided, as Figure 1 shown, which includes a service base station node 100 and a service terminal node 200 communicatively connected to the service base station node 100. The service base station node 100 includes a service base station 110 and a service base station guard module 120 communicatively connected to the service base station 110. The service terminal node 200 includes a service terminal 210 and a service terminal guard module 220 communicatively connected to the service terminal 210. The communication connection between the service base station 110 and the service terminal 210 can form a service network, and the communication connection between the service base station guard module 120 and the service terminal guard module 220 can form a guard network.

[0034] In the embodiments of the present invention, the service base station is mainly the base station of the service network, such as a 5G base station; the service base station guard module is mainly used to integrate with the service base station, support interconnection and interoperability with the service terminal guard module and other service base station guard modules, and form a guard network.

[0035] The service terminal is mainly the terminal of the service network, such as a 5G terminal; the service terminal guard module is mainly integrated with the service terminal, supports interconnection and interoperability with the service base station guard module and other service terminal guard modules, and forms a guard network.

[0036] In addition, the service network is mainly a wireless communication network composed of service base stations and service terminals, used for service bearing, such as 4G cellular network, 5G cellular network, etc.; the guard network is mainly composed of service base station guard modules and service terminal guard modules, and is mainly used to provide the guard ability of coordinated frequency switching for service base stations or service terminals to avoid interference.

[0037] It should be understood that in the embodiments of the present invention, the service terminal deploys a service terminal guard module, which constructs a guard network with the service base station guard module deployed on the service base station. The service terminal guard module receives a network cooperation frequency switching instruction from the service base station guard module. This instruction notifies the occurrence time and target frequency point of the frequency change of the service terminal node. The service terminal guard module assists the service terminal in switching the radio interface frequency of the service terminal node to the target frequency point when the occurrence time of the frequency change arrives, ensuring that the service terminal and the service base station change frequencies synchronously and bypassing the standard 3GPP protocol processing procedure (that is, the frequency switching process keeps the working parameters and protocol procedures of the communication system unchanged). Through this method, the cellular network can sense the radio interface spectrum situation in real time and avoid interference.

[0038] It should be noted that when the service terminal does not deploy the terminal guard module, the frequency of the service terminal needs to be determined for the initial frequency and frequency switching through the standard 3GPP protocol. Since the 3GPP protocol itself has the problem of poor anti-interference ability, therefore, in the communication system provided by the present invention, by deploying the service terminal guard module on the service terminal and the service base station guard module on the service base station, the service terminal guard module and the service base station guard module can assist the service base station and the service terminal in synchronously changing the working frequency to achieve network cooperation frequency change. At the same time, the service terminal guard module deployed on the service terminal side interacts with different service base station guard modules and assists the service terminal in selecting the best cell for handover based on the communication measurement results, so as to ensure that the entire communication network can achieve fast handover when the terminal device moves at the cell edge on the premise of having strong anti-interference ability and avoid service interruption when the terminal device performs cell handover.

[0039] In the embodiments of the present invention, as Figure 2 shown, the service base station 110 and the service base station guard module 120 are communicatively connected through a radio frequency interface. The service base station guard module 120 can frequency-convert the working frequency of the service base station 110 and send it out at the service radio interface of the service base station guard module 120, and can also frequency-convert the radio interface frequency received at the service radio interface and send it to the service base station 110 through the radio frequency interface; the service base station guard module 120 can send a timing signal to the service base station 110, and the time of the service base station guard module 120 is synchronized with the guard network.

[0040] Specifically, the service base station node consists of a service base station and a service base station guard module. The service base station 110 is interconnected with the service radio frequency interface of the service base station guard module 120 through a radio frequency interface. The transmitted signal (operating frequency) of the service base station is frequency-converted by the auxiliary frequency switching unit of the service base station guard module 120 and then sent out at the service air interface of the service base station guard module 120 (air interface frequency); the signal received at the service air interface of the service base station guard module (air interface frequency) is frequency-converted by the auxiliary frequency switching unit of the service base station guard module 120 (operating frequency) and then sent to the radio frequency interface of the service base station through the service radio frequency interface. The whole process is transparent to the service base station. The operating frequency of the service base station is determined by the device capabilities and configurations, and the air interface frequency of the service base station node is determined by the control of the service base station guard module.

[0041] In the embodiment of the present invention, the time synchronization signal of the service base station comes from the service base station guard module, and the guard network formed by the communication unit between different guard modules can achieve guard network-level time synchronization. The service base station guard module can also achieve time synchronization by receiving an external clock signal (such as an external Beidou, 1588, etc. external synchronization source) through the external synchronization interface.

[0042] As Figure 3 shown, the service terminal 210 and the service terminal guard module 220 are communicatively connected through a radio frequency interface. The service terminal guard module 220 can frequency-convert the operating frequency of the service terminal 210 and send it out at the service air interface of the service terminal guard module 220, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service terminal 210 through the radio frequency interface; the time of the service terminal 210 is synchronized with the service base station 110, and the time of the service terminal guard module 220 is synchronized with the guard network where it is located.

[0043] Specifically, the service terminal node consists of a service terminal and a service terminal guard module. The service terminal is interconnected with the service radio frequency interface of the service terminal guard module through a radio frequency interface. The transmitted signal (operating frequency) of the service terminal is frequency-converted by the auxiliary frequency switching unit and then sent out at the service air interface of the service terminal guard module (air interface frequency); the signal received at the service air interface of the service terminal guard module (air interface frequency) is frequency-converted by the auxiliary frequency switching unit (operating frequency) and then sent to the radio frequency interface of the service terminal through the service radio frequency interface. The whole process is transparent to the service terminal. The operating frequency of the service terminal is determined by the service terminal protocol stack, and the air interface frequency of the service terminal node is determined by the service terminal guard module according to the instructions of the service base station guard module and is consistent with the affiliated service base station node.

[0044] In the embodiments of the present invention, the service terminal is synchronized with the service base station, and there is no need for the service terminal guard module to time the service terminal; the service terminal guard module is synchronized with the service base station guard module to which it belongs through the guard network formed by the communication unit.

[0045] Therefore, in the embodiments of the present invention, taking the service base station guard module as the time reference, the service base station is synchronized with the service base station guard module through the timing interface; the service terminal is synchronized with the service base station through the standard air interface protocol; the service terminal guard module is synchronized with the service base station guard module through the guard network; thus, the entire communication system can form a unified timing reference.

[0046] As Figure 3 shown, taking the structural block diagram of the service terminal guard module 220 as an example, it includes at least an intelligent control unit 221, a communication unit 222, an auxiliary frequency switching unit 223, a spectrum sensing unit 224, and a clock unit 225.

[0047] Among them, the communication unit 222 interacts with other guard modules to construct a guard network, establishes an interaction channel between guard modules, and maintains the network-level time synchronization relationship between guard modules; the communication unit provides a bearer service externally through the service interface, assists in expanding the service network coverage, and at the same time, when the service network is interrupted, it can also provide a guaranteed communication service.

[0048] The auxiliary frequency switching unit 223 is used to assist the external device (service base station / service terminal) connected to the service radio frequency interface to perform two-way switching between the operating frequency and the air interface frequency at a given moment under the control of the intelligent control unit, and the switching process is transparent to the external device.

[0049] The spectrum sensing unit 224 is used to sense and monitor the air interface spectrum situation under the control of the intelligent control unit; The clock unit 225 can support providing a synchronous timing service for external devices through the timing interface; at the same time, the clock unit also provides a clock service for other units of the guard module. When an external synchronization signal is input, the clock unit can adjust the local clock based on the external synchronization signal; when no external synchronization signal is input, the clock unit can adjust the local clock according to the output of the communication unit.

[0050] The intelligent control unit 221 obtains the radio interface spectrum situation of its own module through the spectrum sensing unit, shares and exchanges its respective spectrum situation with other modules through the communication unit, forms a collaborative frequency usage strategy, generates the specific radio interface frequency change time and the specific frequency point number to be used based on this frequency usage strategy, and spreads it to the intelligent control units of other modules through the communication unit, and collaboratively controls the auxiliary frequency switching unit to synchronously switch frequencies, so as to realize the real-time change of the radio interface frequency of the service network and avoid interference; the intelligent control unit can also perform collaborative control on the analog base station and the terminal through the control interface.

[0051] The service radio interface is specifically represented as the input / output interface of the service network radio interface frequency, that is, the actual radio interface of the service network; the guard radio interface is specifically represented as the radio interface of the guard network, which is multiplexed by the communication unit and the spectrum sensing unit.

[0052] When the above communication system realizes interference avoidance, it is necessary to perform spectrum sensing on the service network radio interface frequency to realize interference avoidance when it is determined that there is interference. Therefore, in order to realize the interference of the service radio interface frequency, the spectrum sensing unit of the service base station guard module at least includes a spectrum sensing device for the service base station node, and the spectrum sensing unit of the service terminal guard module at least includes a spectrum sensing device for the service terminal node.

[0053] Setting a spectrum sensing device for the service base station node in the service base station guard module can sense the to-be-sensed frequency points within the to-be-sensed frequency range according to the spectrum sensing instruction information obtained from the spectrum sensing reserved configuration information, so as to be able to sense and identify the radio interface spectrum of the cellular network through spectrum sensing, so as to assist in frequency switching to avoid interference when it is sensed that the frequency point is interfered, and thus can effectively improve the anti-interference ability of the communication system.

[0054] Correspondingly, setting a spectrum sensing device for the service terminal node in the service terminal guard module senses the to-be-sensed frequency points within the to-be-sensed frequency range determined by the service base station guard module based on the spectrum sensing instruction information diffused by the service base station guard module. And since the service terminal guard module and the service base station guard module belong to the same guard network, they can maintain time synchronization, and the sensing of the to-be-sensed frequency points can also be synchronized. Thus, it can sense and identify the radio interface spectrum of the cellular network through spectrum sensing, so as to assist in realizing frequency switching in a collaborative manner when an abnormal frequency point is sensed to avoid interference, and jointly with the service base station guard module, achieve the effect of improving the anti-interference ability of the communication system.

[0055] As another embodiment of the present invention, a spectrum sensing device for a service base station node is provided, which is used to implement the spectrum sensing method for a cellular network described below, such as Figure 4As shown, the spectrum sensing device 300 for a service base station node includes: An acquisition module 310, configured to acquire spectrum sensing reserved resource configuration information of a service base station, where the spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling; A generation module 320, configured to generate spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information, and spread the spectrum sensing instruction information to a service terminal guard module through the guard network, where the spectrum sensing instruction information at least includes the position of reserved time-frequency resources required for air interface frequency sensing of a service network and a frequency range to be sensed; the frequency range to be sensed at least includes a frequency point where the current air interface frequency of its own service network is located, frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and other to-be-sensed frequency points in the service network frequency point set that can be used as the air interface frequency of the service network; the service terminal guard module can sense and monitor the to-be-sensed frequency points within the frequency range to be sensed according to the spectrum sensing instruction information; A first sensing module 330, configured to sense and monitor the to-be-sensed frequency points within the frequency range to be sensed according to the spectrum sensing instruction information.

[0056] In an embodiment of the present invention, spectrum sensing instruction information is generated through spectrum sensing reserved resource configuration information of a service base station. Furthermore, a service base station guard module can sense and monitor the to-be-sensed frequency points within the frequency range to be sensed based on the spectrum sensing instruction information to obtain a sensing and monitoring result, so that the available frequencies of a cellular network can be sensed and identified through spectrum sensing, facilitating frequency switching to avoid interference when monitoring anomalies, and achieving the purpose of effectively improving the anti-interference ability of a communication system.

[0057] In this embodiment, a spectrum sensing method for a cellular network is provided, which is applied to a service base station node. Figure 5 is a flowchart of the spectrum sensing method for a cellular network provided according to an embodiment of the present invention, as Figure 5 shown, the spectrum sensing method for a cellular network includes: S110. Acquire spectrum sensing reserved resource configuration information of a service base station, where the spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling; In an embodiment of the present invention, a service base station can obtain spectrum sensing reserved resource configuration information for air interface spectrum sensing of a service base station guard module through a configuration method. The spectrum sensing reserved resource configuration information at least includes parameters such as a resource period, a time domain offset, a duration, and a repetition number.

[0058] S120. Generate spectrum sensing instruction information according to the reserved resource configuration information for spectrum sensing, and spread the spectrum sensing instruction information to the service terminal guard module through the guard network. The spectrum sensing instruction information at least includes the reserved time-frequency resource positions required for sensing the air interface frequency of the service network and the frequency range to be sensed. The frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and the other frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network. The service terminal guard module can sense and monitor the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information. After obtaining the reserved resource configuration information for spectrum sensing, the service base station guard module can generate spectrum sensing instruction information based on this, and at the same time can spread the spectrum sensing instruction information to the service terminal guard module.

[0059] It should be noted that in the embodiments of the present invention, when generating the spectrum sensing instruction information, information such as the air interface parameters of the service base station can also be combined. Specifically, the service base station guard module can obtain the air interface parameters of each cell on the service base station through configuration. The air interface parameters of the service base station at least include: working mode (such as FDD, TDD), technical system (such as LTE, 5G, etc.), subcarrier spacing, uplink-downlink ratio (TDD specific), wireless frame time domain offset and other parameters.

[0060] In the embodiments of the present invention, the service base station can also provide a control interface for the service base station guard module to directly obtain the air interface parameter information to reduce the user's configuration work. Similarly, the reserved resources for spectrum sensing can also be sent by the service base station guard module to the service base station through the control interface to realize the on-demand change of the reserved resources for air interface spectrum sensing.

[0061] After the service base station guard module completes startup, it provides a time synchronization signal to the service base station through the timing interface. After the service base station completes startup, it notifies the service base station guard module every time the system frame number is reversed (for example, it notifies once every time the system frame number is equal to 0). The notification information at least includes: serial number, service base station ID, working cell ID, current system frame number, offset from the next whole second. The service base station guard module spreads information such as the air interface parameters of the service base station and the general spectrum sensing information (spectrum sensing resources, spectrum sensing range, sensing result reporting period) to the service terminal guard module through the guard network.

[0062] It should be understood that the service terminal guard module keeps time synchronization with the service base station guard module through the guard network.

[0063] S130. Sense and monitor the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information.

[0064] In an embodiment of the present invention, a to-be-perceived frequency point within a to-be-perceived frequency range is perceived and monitored according to spectrum sensing instruction information, and a sensing and monitoring result is obtained. When an abnormality occurs in the perceived frequency point, frequency switching can be achieved in cooperation with a service terminal guard module to avoid interference.

[0065] Therefore, the spectrum sensing method for a cellular network provided by the present invention can sense the to-be-perceived frequency points within the to-be-perceived frequency range according to the spectrum sensing instruction information obtained from the spectrum sensing reservation configuration information, so as to be able to identify the air interface spectrum of the cellular network through spectrum sensing, facilitate assisted frequency switching to avoid interference when a frequency point is sensed to be interfered, and thus effectively improve the anti-interference ability of the communication system.

[0066] Since when implementing interference avoidance for a communication system, it is necessary to accurately sense the spectrum of the air interface frequency of the service network to determine whether there is interference in order to achieve accurate avoidance. Therefore, in order for the service network air interface frequency service base station guard module and the service terminal guard module to accurately distinguish whether an abnormal frequency is interference or the operation of a normal service network during sensing, that is, in order to improve the accuracy of frequency sensing of the service base station guard module, sensing can be achieved through the reserved time-frequency resource position in the spectrum sensing instruction information.

[0067] It should be noted that after the cell on the service base station works normally, corresponding time-frequency resources will be reserved during air interface scheduling according to the spectrum sensing reservation resource configuration information. These reserved resources are not used for uplink and downlink service scheduling and are only for the spectrum sensing use of the service base station guard module and the service terminal guard entrance.

[0068] Specifically, as Figure 6 shown, perceiving and monitoring the to-be-perceived frequency points within the to-be-perceived frequency range according to the spectrum sensing instruction information includes: S131. Determine the reserved time-frequency resource position required for sensing the air interface frequency of the service network and the to-be-perceived frequency range according to the spectrum sensing instruction information; S132. Determine the corresponding sensing and monitoring method according to the belonging of the current to-be-perceived frequency point within the to-be-perceived frequency range, and obtain the sensing and monitoring result. The belonging of the current to-be-perceived frequency point within the to-be-perceived frequency range includes any one of the frequency point where the current air interface frequency of its own service network is located, the frequency points within a preset number of hops that are not the frequency point where the current air interface frequency of its own service network is located, and the to-be-perceived frequency points in the service network frequency point set that can be used as the air interface frequency of the service network.

[0069] It should be noted that in the embodiments of the present invention, the other candidate frequency points that can be used as the radio interface frequency of the service network in the service network frequency point set can be specifically understood as the candidate frequency points that can be used as the radio interface frequency of the service network after removing the frequency point where the radio interface frequency of its own service network is located and the frequency points where the radio interface frequencies of non-own service networks within the preset hop count range are located from the service network frequency point set.

[0070] Further specifically, as Figure 7 shown, determine the corresponding sensing and monitoring method according to the belonging of the current candidate frequency point within the candidate frequency range, and obtain the sensing and monitoring result, including: S132a. Determine the belonging of the current candidate frequency point within the candidate frequency range; In the embodiments of the present invention, since the candidate frequency range includes at least the frequency point where the radio interface frequency of its own service network is located, the frequency points where the radio interface frequencies of non-own service networks within the preset hop count range are located, and the other candidate frequency points that can be used as the radio interface frequency of the service network in the service network frequency point set, it is necessary to determine which category the current candidate frequency point belongs to, so as to determine different frequency point sensing methods.

[0071] S132b. If the current candidate frequency point belongs to the frequency point where the current radio interface frequency of its own service network is located, or if the current candidate frequency point belongs to the frequency point where the current radio interface frequency of a non-own service network within the preset hop count range is located, then sense and monitor the frequency points within the candidate frequency range at the reserved time-frequency resource position, and obtain the sensing and monitoring result; In the embodiments of the present invention, if the current candidate frequency point belongs to the frequency point where the radio interface frequency of its own service network is located, or belongs to the frequency point where the radio interface frequency of a non-own service network within the preset hop count range is located, it is determined that there may be co-frequency interference for the current candidate frequency point, and thus it is impossible to distinguish whether the currently sensed signal is a normal service signal or interference. Therefore, it is necessary to sense and monitor the current candidate frequency point at the reserved time-frequency resource position. Since it is necessary to perform sensing and monitoring at the reserved time-frequency resource position, spectrum sensing waiting is required for this situation until the reserved time-frequency resource is reached and then sensing is performed.

[0072] It should be noted here that the preset hop count range can specifically be a two-hop range, that is, the frequency points where the radio interface frequencies of non-own service networks within the two-hop range are located.

[0073] S132c. If the current candidate frequency point belongs to the other candidate frequency points that can be used as the radio interface frequency of the service network in the service network set, then determine the sensing and monitoring method according to whether the frequency point where the current radio interface frequency of its own service network is located and / or the frequency points where the current radio interface frequencies of non-own service networks within the preset hop count range affect the sensing accuracy of the current candidate frequency point.

[0074] In an embodiment of the present invention, for a currently to-be-sensed frequency point that belongs to other to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, it is also necessary to determine whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within a preset number of hops have an impact on the sensing accuracy of the currently to-be-sensed frequency point.

[0075] Specifically, if the currently to-be-sensed frequency point belongs to other to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, then determine the sensing monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within a preset number of hops have an impact on the sensing accuracy of the currently to-be-sensed frequency point, including: If the currently to-be-sensed frequency point belongs to other to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, determine whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within a preset number of hops and the currently to-be-sensed frequency point is less than a preset distance; If it is less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within a preset number of hops have an impact on the sensing accuracy of the currently to-be-sensed frequency point, perform sensing monitoring on the currently to-be-sensed frequency point at the reserved time-frequency resource position, and obtain the sensing monitoring result; If it is not less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within a preset number of hops have no impact on the sensing accuracy of the currently to-be-sensed frequency point, start sensing monitoring on the currently to-be-sensed frequency point at any time, and obtain the sensing monitoring result.

[0076] It should be understood that if the currently to-be-perceived frequency point belongs to the to-be-perceived frequency points in the service network set that can be used as the air interface frequency of the service network, and the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range and the current to-be-perceived frequency point is less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range are relatively close to the current to-be-perceived frequency point. In this case, the signal of the frequency point where the current air interface frequency of its own service network is located and / or the signal of the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range will leak to the current to-be-perceived frequency point, resulting in an increase in the background noise and affecting the sensing accuracy. Therefore, for this situation, it is necessary to perform sensing monitoring on the current to-be-perceived frequency point at the reserved time-frequency resource position and obtain the sensing monitoring result. When the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range and the current to-be-perceived frequency point is not less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range will not affect the sensing accuracy of the current to-be-perceived frequency point. Therefore, the sensing monitoring of the current to-be-perceived frequency point can be started at any time and the sensing monitoring result can be obtained.

[0077] It should be noted that when performing sensing on the to-be-perceived frequency points within the to-be-perceived frequency range, the sensing priority order of the to-be-perceived frequency points within the to-be-perceived frequency range from high to low is as follows: the frequency point where the current air interface frequency of its own service network is located, the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range, the to-be-perceived frequency points in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range is less than the preset distance, and the to-be-perceived frequency points in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-own service network's current air interface frequencies are located within the preset hop count range is not less than the preset distance.

[0078] It should be understood that when performing air interface spectrum sensing using the reserved time-frequency resources, the air interface frequency of its own service network is preferentially monitored, and the remaining resources can be used for other frequency monitoring.

[0079] In addition, if it is calculated based on the cell air interface parameters that there is a small amount of signal emission in the time domain of the reserved time-frequency resources, such as there may be cell pilots transmitted in the downlink subframe, the spectrum sensing should avoid using these resources in the time domain.

[0080] In the embodiments of the present invention, the service base station guard module can schedule the sensing frequency, sensing time, and reporting opportunity of the designated service terminal guard module through the guard network. The service terminal guard module can upload the sensing result to the service base station guard module through the guard network for the service base station guard module to perform network-level real-time spectrum adjustment to avoid interference.

[0081] In summary, the spectrum sensing method for a cellular network provided by the present invention can sense the to-be-sensed frequency points within the to-be-sensed frequency range according to the spectrum sensing instruction information obtained from the spectrum sensing reservation configuration information, so as to be able to sense the to-be-sensed frequency points within the reserved time-frequency resources by means of the air interface scheduling of the service base station, which not only avoids the impact on the air interface frequency of the current service network, but also can accurately and effectively sense whether the frequency points are interfered. Thus, it is possible to realize the sensing and identification of the air interface spectrum of the cellular network through spectrum sensing, so as to assist in frequency switching to avoid interference when it is sensed that the frequency point is interfered, and further effectively improve the anti-interference ability of the communication system.

[0082] As another embodiment of the present invention, there is provided a spectrum sensing device for a service terminal node, which is used to implement the spectrum sensing method for a cellular network described below. Among them, it is applied to a service terminal node, and the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal can be communicatively connected to a service base station in a service base station node to form a service network, and the service terminal guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network; as Figure 8 shown, the spectrum sensing device 400 for a service terminal node includes: A receiving module 410, configured to receive spectrum sensing instruction information sent by a service base station guard module; the service base station guard module can generate spectrum sensing instruction information according to the spectrum sensing reservation resource configuration information of the service base station; A determining module 420, configured to determine the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the to-be-sensed frequency range according to the spectrum sensing instruction information; the to-be-sensed frequency range at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the non-current air interface frequency of its own service network is located within a preset number of hops, and other to-be-sensed frequency points in the service network frequency point set that can be used as the air interface frequency of the service network; A second sensing module 430, configured to sense and monitor the to-be-sensed frequency points within the to-be-sensed frequency range and obtain a sensing and monitoring result; A reporting module 440, configured to report the sensing and monitoring result to the service base station guard module through the guard network.

[0083] In an embodiment of the present invention, the service terminal guard module can receive the spectrum sensing instruction information from the service base station guard module, sense and monitor the to-be-sensed frequency points within the to-be-sensed frequency range according to the spectrum sensing instruction information, obtain the sensing and monitoring results, so as to realize the sensing and identification of the air interface spectrum of the cellular network through spectrum sensing, facilitate frequency switching to avoid interference when monitoring anomalies, and achieve the purpose of effectively improving the anti-interference ability of the communication system.

[0084] As another embodiment of the present invention, a spectrum sensing method for a cellular network is provided, which is applied to a service terminal node. Figure 9 It is a flowchart of the spectrum sensing method for a cellular network provided according to an embodiment of the present invention, as Figure 9 shown, the spectrum sensing method for a cellular network includes: S210. Receive the spectrum sensing instruction information sent by the service base station guard module; the service base station guard module can generate the spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information of the service base station. In addition, the service terminal is synchronized with the service base station at the air interface, and the use of the uplink and downlink time-frequency resources is controlled by the scheduling of the service base station.

[0085] S220. Determine the reserved time-frequency resource positions and the to-be-sensed frequency range required for the air interface frequency sensing of the service network according to the spectrum sensing instruction information; the to-be-sensed frequency range at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and other to-be-sensed frequency points in the service network frequency point set that can be used as the air interface frequency of the service network. In an embodiment of the present invention, the service terminal guard module is synchronized with the service base station guard module in time, and the service terminal guard module can determine the specific time-frequency resource positions reserved for the air interface spectrum sensing, the to-be-sensed frequency range, and the detection result reporting period according to the air interface parameters of the service base station, general spectrum sensing information, etc. sent through the air interface.

[0086] S230. Sense and monitor the to-be-sensed frequency points within the to-be-sensed frequency range, and obtain the sensing and monitoring results. S240. Report the sensing and monitoring results to the service base station guard module through the guard network.

[0087] The service terminal guard module senses and monitors the to-be-sensed frequency points within the to-be-sensed frequency range, and reports the sensing and monitoring results after sensing to the service base station guard module.

[0088] It should be noted that the service terminal guard module determines the reporting timing of the sensing results according to the spectrum sensing parameters.

[0089] It should also be noted that the service base station guard module can schedule the sensing frequency, sensing time, and reporting opportunity of the specified service terminal guard module through the guard network. The service terminal guard module can upload the sensing results to the service base station guard module through the guard network for the service base station guard module to perform network-level real-time spectrum adjustment to avoid interference.

[0090] In the embodiment of the present invention, a spectrum sensing method for a cellular network applied to a service terminal node senses the to-be-sensed frequency points within the to-be-sensed frequency range determined by the service base station guard module based on the spectrum sensing instruction information diffused by the service base station guard module. And since the service terminal guard module and the service base station guard module belong to the same guard network, they can maintain time synchronization, and the sensing of the to-be-sensed frequency points can also be synchronized. Thus, it is possible to sense and identify the air interface spectrum of the cellular network through spectrum sensing, so as to assist in achieving frequency switching in a collaborative manner when an abnormal frequency point is sensed to avoid interference, and jointly with the service base station guard module to achieve the effect of improving the anti-interference ability of the communication system.

[0091] Further specifically, sensing and monitoring the to-be-sensed frequency points within the to-be-sensed frequency range and obtaining the sensing and monitoring results include: Judging the belonging of the current to-be-sensed frequency point within the to-be-sensed frequency range; If the current to-be-sensed frequency point belongs to the frequency point where the current air interface frequency of its own service network is located, or if the current to-be-sensed frequency point belongs to the frequency points within the preset hop count range that are not the current air interface frequency of its own service network, then sense and monitor the frequency points within the to-be-sensed frequency range at the reserved time-frequency resource position and obtain the sensing and monitoring results; If the current to-be-sensed frequency point belongs to the to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, determine the sensing and monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points within the preset hop count range that are not the current air interface frequency of its own service network have an impact on the sensing accuracy of the current to-be-sensed frequency point; Among them, determining the sensing and monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points within the preset hop count range that are not the current air interface frequency of its own service network have an impact on the sensing accuracy of the current to-be-sensed frequency point includes: If the current to-be-sensed frequency point belongs to the to-be-sensed frequency points in the service network set that can be used as the air interface frequency of the service network, judge whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points within the preset hop count range that are not the current air interface frequency of its own service network and the current to-be-sensed frequency point is less than the preset distance; If it is less than the preset distance, it is determined that the frequency points where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequency of the non-own service network is located within the preset number of hops have an impact on the perception accuracy of the current frequency point to be sensed. The current frequency point to be sensed is sensed and monitored at the reserved time-frequency resource position, and the sensing and monitoring result is obtained. If it is not less than the preset distance, it is determined that the frequency points where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequency of the non-own service network is located within the preset number of hops have no impact on the perception accuracy of the current frequency point to be sensed. The current frequency point to be sensed is sensed and monitored at any time, and the sensing and monitoring result is obtained.

[0092] Regarding the sensing and monitoring process of the spectrum sensing method for the cellular network on the service terminal side of the present invention when improving the sensing accuracy, reference can be made to the description of the service base station side above, and details will not be repeated here.

[0093] In summary, the spectrum sensing method for the cellular network provided by the present invention senses the frequency points to be sensed within the frequency range to be sensed determined by the service base station guard module based on the spectrum sensing instruction information diffused by the service base station guard module. Since the service terminal guard module and the service base station guard module belong to the same guard network, they can maintain time synchronization, and thus the sensing of the frequency points to be sensed can also be synchronized. In addition, the guard network can be used as a control information transmission channel for the service network to realize the bidirectional transmission of cooperative control related instructions between the service base station and the service terminal. The service base station provides a control interface to be interconnected with the service base station guard module, receives the air interface scheduling request of the service base station guard module, reserves time-frequency resources for the guard module to perform air interface spectrum sensing, can improve the accuracy of frequency sensing during frequency sensing, and at the same time realizes frequency switching in a cooperative manner when an abnormal frequency point is sensed to avoid interference, and jointly acts with the service base station guard module to achieve the effect of improving the anti-interference ability of the communication system.

[0094] The following details the specific implementation process of the spectrum sensing method for the cellular network in the communication system of the present invention.

[0095] As Figure 10 shown, 1 cell 1 (ID = 1) is deployed on the service base station, with a working frequency F1. After being frequency-converted by the service base station guard module, the air interface frequency of the service network becomes F1'; the working frequency of the service terminal is F1, and it resides in cell 1. The air interface parameters are: TDD, LTE, subcarrier spacing (15 kHz), uplink-downlink configuration (1:9), wireless frame time domain offset (frame boundary aligned with the whole second boundary), etc.

[0096] As Figure 11As shown in the figure, the service base station guard module obtains the air interface parameters of each cell on the service base station through configuration, including: operating mode (TDD), technical system (LTE), subcarrier spacing (15 kHz), uplink-downlink configuration (1:9), radio frame time domain offset (aligned with the whole second boundary of the frame boundary), single antenna, the downlink physical control channel (PDCCH) occupying 3 symbols, normal cyclic prefix and other parameters.

[0097] The service base station obtains the parameters for reserving resources for air interface spectrum sensing for the guard module through configuration, including: resource period (40 ms), time domain offset (the 20th subframe), duration (1 ms), repetition times (permanent) and other parameters.

[0098] After the service base station guard module is started, it provides a time synchronization signal to the service base station through the timing interface. After the service base station is started, it notifies the service base station guard module every time the system frame number is reversed. The notification information includes: serial number (3721), service base station ID (1), working cell ID (1), current system frame number (0), offset from the next whole second (240 ms).

[0099] The service base station guard module diffuses information such as the air interface parameters of the service base station, general spectrum sensing information (spectrum sensing resources (reserved resources), spectrum sensing range (F1’, F2’,..., Fn’), sensing result reporting period (1 second)) to the service terminal guard module through the guard network (“service base station parameter broadcast”).

[0100] The service terminal guard module maintains time synchronization with the service base station guard module through the guard network; after the cells on the service base station work normally, corresponding time-frequency resources will be reserved during air interface scheduling according to the spectrum sensing reserved resource configuration information, as Figure 12 shown, these reserved resources are not used for downlink service scheduling and are only used by the guard module for spectrum sensing.

[0101] The downlink cell pilots and PCFICH (Physical Control Format Indicator Channel) channels of the reserved resources can still be sent. Therefore, the time domain resources of the 2nd, 3rd, 4th, 6th, 7th, 9th, 10th, 11th, 13th, and 14th symbols can be used for spectrum sensing, as Figure 12 the symbols filled with dark dot patterns marked in the figure. The service terminal guard module obtains the specific time-frequency resource positions reserved for spectrum sensing in the air interface (such as Figure 12 the symbols filled with dark dot patterns marked in the figure), the frequency range to be sensed (F1’, F2’,..., Fn’) and the sensing result reporting period (1 second) based on the air interface parameters of the service base station and general spectrum sensing information diffused in the air interface.

[0102] The service terminal synchronizes with the service base station over the air interface, and the use of uplink and downlink time-frequency resources is controlled by the scheduling of the service base station. When the service base station guard module and the service terminal guard module perform over-the-air spectrum sensing using their own spectrum sensing units, since it is a downlink subframe, the service base station guard module can directly use the time-domain resources of the 2nd, 3rd, 4th, 6th, 7th, 9th, 10th, 11th, 13th, and 14th symbols for spectrum sensing; while the service terminal guard module needs to consider the over-the-air transmission path delay from the service base station to the service terminal, so the starting position of the available spectrum sensing resources lags behind the service base station by the "path delay", and the duration is indicated by the spectrum sensing resources in the spectrum sensing information; if the spectrum sensing duration is less than the minimum duration required for one sensing by the guard module, this resource is not used for spectrum sensing.

[0103] The service base station guard module and the service terminal guard module preferentially sense the over-the-air frequency of the service network within each reserved spectrum sensing resource; the service terminal guard module reports the situation information of all sensed spectrums once per second.

[0104] The service base station guard module can also schedule and modify the sensing frequency, sensing time, and reporting timing of a specific service terminal guard module through the guard network (for example: sensing frequency range (F1'', F2'',..., Fm''), sensing for 20 seconds, sensing result reporting period (200 milliseconds)). The service terminal guard module can upload the sensing results to the service base station guard module through the guard network for the service base station guard module to perform network-level real-time spectrum adjustment to avoid interference.

[0105] In the embodiment of the present invention, the service base station can also provide a control interface for the service base station guard module to directly obtain over-the-air parameter information to reduce the configuration work of users; similarly, the spectrum sensing reserved resources can also be issued to the service base station by the service base station guard module through the control interface to achieve on-demand change of the over-the-air spectrum sensing reserved resources.

[0106] When the service network is an FDD network, the uplink and downlink of the working frequency and the over-the-air frequency are different frequencies. The above process principle is the same, and the difference is that the reserved spectrum sensing resources include both downlink time-domain resources and uplink time-domain resources. When sensing the downlink spectrum, the available resources are the same as the previous description; when sensing the uplink spectrum, since all LTE uplink resources are scheduled by the base station, they can be completely vacated for spectrum sensing.

[0107] In summary, the spectrum sensing method for a cellular network provided by the present invention reserves time-frequency resources by the service base station for spectrum sensing, can adapt to various network devices of different systems and different modes such as FDD, TDD, LTE, and 5G, collect their respective spectrum situation information, and provides a basis for subsequent interference identification and avoidance, and network collaborative optimization.

[0108] It is understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A spectrum sensing method for a cellular network, characterized in that, Applied to a service base station node, the service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service base station can be communicatively connected to a service terminal in a service terminal node to form a service network, and the service base station guard module can be communicatively connected to a service terminal guard module in the service terminal node to form a guard network; The spectrum sensing method for a cellular network includes: Obtaining spectrum sensing reserved resource configuration information of the service base station, where the spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling; Generating spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information, and spreading the spectrum sensing instruction information to the service terminal guard module through the guard network. The spectrum sensing instruction information at least includes the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the frequency range to be sensed. The frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the non-current air interface frequencies of other service networks within a preset number of hops are located, and other frequency points that can be used as the air interface frequency of the service network in the service network frequency point set. The service terminal guard module can sense and monitor the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information; Sensing and monitoring the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information.

2. The spectrum sensing method for a cellular network according to claim 1, characterized in that, Sensing and monitoring the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information includes: Determining the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the frequency range to be sensed according to the spectrum sensing instruction information; Determining a corresponding sensing and monitoring method according to the belonging of the current frequency point to be sensed within the frequency range to be sensed, and obtaining a sensing and monitoring result. The belonging of the current frequency point to be sensed within the frequency range to be sensed includes any one of the frequency point where the current air interface frequency of its own service network is located, the frequency points where the non-current air interface frequencies of other service networks within a preset number of hops are located, and other frequency points that can be used as the air interface frequency of the service network in the service network frequency point set.

3. The spectrum sensing method for a cellular network according to claim 2, wherein Determining a corresponding sensing and monitoring method according to the belonging of the current frequency point to be sensed within the frequency range to be sensed, and obtaining a sensing and monitoring result includes: Judging the belonging of the current frequency point to be sensed within the frequency range to be sensed; If the current frequency point to be sensed belongs to the frequency point where the current air interface frequency of its own service network is located, or if the current frequency point to be sensed belongs to the frequency points where the non-current air interface frequencies of other service networks within a preset number of hops are located, then sense and monitor the frequency points within the frequency range to be sensed at the position of the reserved time-frequency resources, and obtain a sensing and monitoring result; If the current frequency point to be sensed belongs to other frequency points that can be used as the air interface frequency of the service network in the service network set, then determine the sensing and monitoring method according to whether the current frequency point to be sensed is affected by the sensing accuracy of the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the non-current air interface frequencies of other service networks within a preset number of hops are located.

4. The spectrum sensing method for a cellular network according to claim 3, characterized in that, If the current frequency point to be sensed belongs to the other frequency points to be sensed in the service network set that can be used as the air interface frequency of the service network, determine the sensing monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range affect the sensing accuracy of the current frequency point to be sensed, including: If the current frequency point to be sensed belongs to the other frequency points to be sensed in the service network set that can be used as the air interface frequency of the service network, determine whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range and the current frequency point to be sensed is less than the preset distance; If it is less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range affect the sensing accuracy of the current frequency point to be sensed, perform sensing monitoring on the current frequency point to be sensed at the reserved time-frequency resource position, and obtain the sensing monitoring result; If it is not less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range do not affect the sensing accuracy of the current frequency point to be sensed, start sensing monitoring on the current frequency point to be sensed at any time, and obtain the sensing monitoring result.

5. The spectrum sensing method for a cellular network according to any one of claims 1 to 4, characterized in that The sensing priority order of the frequency points to be sensed within the frequency range to be sensed is, from high to low: the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range, the frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range is less than the preset distance, and the frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network and the distance between which and the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks within the preset hop count range is not less than the preset distance.

6. A spectrum sensing method for a cellular network, characterized in that, Applied to a service terminal node, the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal can be communicatively connected to a service base station in a service base station node to form a service network, and the service terminal guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network; The spectrum sensing method for a cellular network includes: Receiving spectrum sensing instruction information sent by a service base station guard module; the service base station guard module can generate spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information of the service base station; Determine the reserved time-frequency resource positions and the frequency range to be sensed required for the air interface frequency sensing of the service network according to the spectrum sensing instruction information; the frequency range to be sensed includes at least the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and the other frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network; Perform sensing monitoring on the frequency points to be sensed within the frequency range to be sensed, and obtain the sensing monitoring results; report the sensing monitoring results to the service base station escort module through the escort network.

7. The spectrum sensing method for a cellular network according to claim 6, characterized in that, Perform sensing monitoring on the frequency points to be sensed within the frequency range to be sensed, and obtain the sensing monitoring results, including: Judge the attribution of the current frequency point to be sensed within the frequency range to be sensed; If the current frequency point to be sensed belongs to the frequency point where the current air interface frequency of its own service network is located, or if the current frequency point to be sensed belongs to the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, then perform sensing monitoring on the frequency points within the frequency range to be sensed at the reserved time-frequency resource positions, and obtain the sensing monitoring results; If the current frequency point to be sensed belongs to the other frequency points to be sensed in the service network set that can be used as the air interface frequency of the service network, determine the sensing monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed; Among them, determining the sensing monitoring method according to whether the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed includes: If the current frequency point to be sensed belongs to the other frequency points to be sensed in the service network set that can be used as the air interface frequency of the service network, judge whether the distance between the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops and the current frequency point to be sensed is less than a preset distance; If it is less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops have an impact on the sensing accuracy of the current frequency point to be sensed, perform sensing monitoring on the current frequency point to be sensed at the reserved time-frequency resource positions, and obtain the sensing monitoring results; If it is not less than the preset distance, it is determined that the frequency point where the current air interface frequency of its own service network is located and / or the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops have no impact on the sensing accuracy of the current frequency point to be sensed, and start sensing monitoring on the current frequency point to be sensed at any time, and obtain the sensing monitoring results.

8. A spectrum sensing device for a service base station node, which is used to implement the spectrum sensing method for a cellular network according to any one of claims 1 to 5, characterized in that, Applied to a service base station node, the service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service base station can be communicatively connected to a service terminal in a service terminal node to form a service network, and the service base station guard module can be communicatively connected to a service terminal guard module in the service terminal node to form a guard network; The spectrum sensing device for the service base station node includes: An acquisition module, configured to acquire spectrum sensing reserved resource configuration information of the service base station, where the spectrum sensing reserved resource configuration information at least includes reserved time-frequency resources for air interface scheduling; A generation module, configured to generate spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information, and spread the spectrum sensing instruction information to the service terminal guard module through the guard network. The spectrum sensing instruction information at least includes the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the frequency range to be sensed; The frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and other frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network; The service terminal guard module can sense and monitor the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information; A first sensing module, configured to sense and monitor the frequency points to be sensed within the frequency range to be sensed according to the spectrum sensing instruction information.

9. A spectrum sensing device for a service terminal node, which is used to implement the spectrum sensing method for a cellular network described in claim 6 or 7, characterized in that, Applied to a service terminal node, the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal can be communicatively connected to a service base station in a service base station node to form a service network, and the service terminal guard module can be communicatively connected to a service base station guard module in the service base station node to form a guard network; The spectrum sensing device for the service terminal node includes: A receiving module, configured to receive the spectrum sensing instruction information sent by the service base station guard module; The service base station guard module can generate the spectrum sensing instruction information according to the spectrum sensing reserved resource configuration information of the service base station; A determination module, configured to determine the position of the reserved time-frequency resources required for air interface frequency sensing of the service network and the frequency range to be sensed according to the spectrum sensing instruction information; The frequency range to be sensed at least includes the frequency point where the current air interface frequency of its own service network is located, the frequency points where the current air interface frequencies of non-own service networks are located within a preset number of hops, and other frequency points to be sensed in the service network frequency point set that can be used as the air interface frequency of the service network; A second sensing module, configured to sense and monitor the frequency points to be sensed within the frequency range to be sensed, and obtain a sensing and monitoring result; A reporting module, configured to report the sensing and monitoring result to the service base station guard module through the guard network.

10. A communication system, characterized in that, Including: A service base station node and a service terminal node communicatively connected to the service base station node; The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service base station guard module includes the spectrum sensing device for the service base station node as recited in claim 8; The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal guard module includes the spectrum sensing device for the service terminal node as recited in claim 9; The service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module and the service terminal guard module are communicatively connected to form a guard network.

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