Frequency switching control method, device, service terminal node and system

Abstract

The invention relates to the technical field of communication, and particularly discloses a frequency switching control method and device, a service terminal node and a system, and the method comprises the steps: carrying out the consistency verification of a current resident cell ID of a service terminal and a frequency switching cell ID when a frequency switching control notification message transmitted by a service terminal guard module is received; the service terminal guard module can receive a frequency switching control instruction sent by the service base station guard module through the guard network, and generates a frequency switching control notification message according to the frequency switching control instruction; if the ID of the current resident cell is consistent with the ID of the frequency switching cell, determining that the consistency verification of the frequency switching control notification message is passed, and judging whether the current effective moment is reached or not; and if the current effective moment arrives, locking the air interface frequency of the service terminal node to the target frequency. The frequency switching control method provided by the invention can improve the anti-interference capability of the cellular network.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a frequency switching control method, a frequency switching control device, a service terminal node, and a communication system. Background Art

[0002] Commercial cellular network technologies represented by 5G, with their excellent characteristics such as large bandwidth, low latency, and ultra-large-scale networking, have significantly changed people's lifestyles and promoted the rapid progress of society. Commercial cellular networks all operate on specific frequencies, and these frequencies are not allowed to be used by other wireless devices to prevent interference to communication; when applying cellular networks to special fields, due to the lack of anti-interference ability of cellular networks, when encountering interference, communication degradation or even service interruption may occur.

[0003] Therefore, how to improve the anti-interference ability of cellular networks has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The present invention provides a frequency switching control method, a frequency switching control device, a service terminal node, and a communication system, which solve the problem of poor anti-interference ability of cellular networks when applied to special fields in the related art.

[0005] As a first aspect of the present invention, a frequency switching control method is provided. The method is applied to a service terminal node, where 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 can be communicatively connected to a service base station guard module in a service base station node to form a guard network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network. The frequency switching control method includes: When receiving a frequency switching control notification message transmitted by the service terminal guard module, performing consistency verification on the current resident cell ID of the service terminal and the frequency switching cell ID; the service terminal guard module can receive a frequency switching control instruction sent by the service base station guard module through the guard network and generate a frequency switching control notification message according to the frequency switching control instruction; the frequency switching control notification message at least includes a frequency switching cell ID, a target frequency, and an effective time. If the current resident cell ID is consistent with the frequency switching cell ID, it is determined that the consistency verification of the frequency switching control notification message passes, and it is judged whether the current effective time has arrived; If the current effective time has arrived, lock the radio interface frequency of the service terminal node to the target frequency.

[0006] Further, if the current effective time has not arrived, the frequency switching control notification message is saved until the current effective time arrives, and then the radio interface frequency of the service terminal node is locked to the target frequency.

[0007] Further, if the effective time of the previously received frequency switching control notification message has not arrived and the consistency check of the currently received frequency switching control notification message passes, the monitoring of the effective time of the previously received frequency switching control notification message is stopped, and processing is performed according to whether the current effective time of the currently received frequency switching control notification message has arrived.

[0008] Further, if the current resident cell ID is inconsistent with the frequency switching cell ID, it is determined that the consistency check of the frequency switching control notification message fails, and the frequency switching control notification message is discarded.

[0009] Further, the frequency switching control method further includes the following steps before receiving the frequency switching control notification message transmitted by the service terminal guard module: When receiving the frequency switching control notification message transmitted by the service terminal guard module, the radio interface frequency of the service terminal node is locked to the target frequency specified in the frequency switching control notification message; Wherein, the service terminal guard module can generate a frequency switching control notification message according to the received signal quality of different service base station guard modules and the radio interface frequency indication instruction after establishing a guard network with the service base station guard module, and the frequency switching cell ID and the target frequency of the frequency switching control notification message correspond to the optimal working cell and the corresponding radio interface frequency determined by the service terminal guard module according to the signal quality and the radio interface frequency indication instruction.

[0010] Further, locking the radio interface frequency of the service terminal node to the target frequency includes: Controlling the radio frequency transceiver, radio frequency front end, and antenna of the service terminal to establish a radio frequency path corresponding to the target frequency.

[0011] As another aspect of the present invention, there is provided a frequency switching control device, which 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 guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network; the frequency switching control device includes: The verification module is used to perform consistency verification on the current resident cell ID and the frequency switching cell ID of the service terminal when receiving the frequency switching control notification message transmitted by the service terminal guard module. The service terminal guard module can receive the frequency switching control instruction sent by the service base station guard module through the guard network and generate a frequency switching control notification message according to the frequency switching control instruction. The frequency switching control notification message at least includes a frequency switching cell ID, a target frequency, and an effective time. The determination module is used to determine that the consistency verification of the frequency switching control notification message passes if the current resident cell ID is consistent with the frequency switching cell ID, and judge whether the current effective time has arrived. The frequency switching module is used to lock the radio interface frequency of the service terminal node to the target frequency if the current effective time has arrived.

[0012] As another aspect of the present invention, a service terminal node is provided, which includes: a service terminal and a service terminal guard module. The service terminal at least includes an application processing unit, a communication processing unit, a radio frequency transceiver, a radio frequency front end, and an antenna. The application processing unit is connected to a peripheral interface. The communication processing unit is communicatively connected to the application processing unit. The communication processing unit includes the frequency switching control device described above. The communication processing unit is connected to the service terminal guard module through a control interface. The radio frequency transceiver is communicatively connected to the communication processing unit. The radio frequency front end is communicatively connected to the radio frequency transceiver. The antenna is communicatively connected to the radio frequency front end. The radio frequency transceiver can support k frequency bands. The radio frequency front end includes n channels. The number of antennas is m. k, m, and n are all natural numbers greater than or equal to 1. When k = n = m, the communication processing unit can lock the radio interface frequency of the radio frequency transceiver to the target frequency when receiving the frequency switching control notification message of the service terminal guard module and determining that frequency switching is to be performed, so that the radio frequency transceiver, the channels of the radio frequency front end, and the antenna establish a radio frequency path corresponding to the target frequency.

[0013] Further, when k is not equal to n, the service terminal further includes a first switch. The first switch is located between the radio frequency transceiver and the radio frequency front end. One end of the first switch is connected to the radio frequency transceiver, and the other end of the first switch is connected to the radio frequency front end. The first switch can select a matching channel to be matched and connected to the frequency band of the radio frequency transceiver. When m is not equal to n, the service terminal further includes a second switch, which is located between the RF front end and the antenna. The channels of the RF front end are connected to the antenna through the second switch, and the second switch can select a matching antenna to be connected to the channels of the RF front end in a matching manner. When k, m, and n are all not equal, the service terminal further includes a first switch and a second switch. The first switch is located between the RF transceiver and the RF front end. One end of the first switch is connected to the RF transceiver, and the other end of the first switch is connected to the RF front end. The first switch can select a matching channel to be connected to the frequency band of the RF transceiver in a matching manner. The second switch is located between the RF front end and the antenna. The channels of the RF front end are connected to the antenna through the second switch, and the second switch can select a matching antenna to be connected to the channels of the RF front end in a matching manner.

[0014] As another aspect of the present invention, there is provided a communication system, which includes a service base station node and the service terminal node as described above that is communicatively connected to the service base station node. The service base station node includes a service base station and a service base station protection module, and the service terminal node includes a service terminal and a service terminal protection module. The communication connection between the service base station and the service terminal can form a service network, and the communication connection between the service base station protection module and the service terminal protection module can form a protection network.

[0015] The frequency switching control method provided by the present invention receives a cooperative frequency switching instruction from a service base station node through a service terminal protection module, and directly switches the air interface frequency of the service terminal hardware platform at the effective moment indicated by the instruction. This process can achieve synchronous and rapid cooperation between the cellular network service base station node and the service terminal node for frequency switching to avoid interference without affecting the normal operation of the protocol stack of the service terminal, and achieve the effect of greatly improving the anti-interference performance of the cellular network. 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. Together with the following specific embodiments, they are used to explain the present invention, 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 It is a structural block diagram of the service terminal node provided by the present invention.

[0019] Figure 3 It is a structural block diagram of the frequency switching control device provided by the present invention.

[0020] Figure 4 Schematic diagram of the functional modules of the typical service terminal provided by the present invention.

[0021] Figure 5 Schematic diagram of the functional modules of the typical service terminal including a switch provided by the present invention.

[0022] Figure 6a Schematic diagram of the structure of the service terminal when k is not equal to n provided by the present invention.

[0023] Figure 6b Schematic diagram of the structure of the service terminal when m is not equal to n provided by the present invention.

[0024] Figure 6c Schematic diagram of the structure of the service terminal when k, m, and n are all not equal provided by the present invention.

[0025] Figure 7 Flowchart of the frequency switching control method provided by the present invention.

[0026] Figure 8 Network architecture diagram in a specific example of the frequency switching control method provided by the present invention. Detailed implementation manners

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may 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.

[0028] 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 with reference to the accompanying 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 in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here. 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 including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] Currently, under the 3GPP standard system, the operating frequency point of a cell (deployed on a base station) is periodically sent in the air interface system message as an important system parameter. Once a cell is established, the operating frequency point generally does not change unless cell reconfiguration is performed, which involves a complex base station configuration management process and usually has a large time delay, generally at the minute level. Therefore, when a terminal accesses a cell, it is difficult to ensure rapid frequency switching of the cell under the 3GPP protocol system, resulting in poor anti-interference ability of the cellular network.

[0031] Based on this, in an embodiment of the present invention, a communication system 10 is provided, as Figure 1 shown, including 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, and the service terminal node 200 includes a service terminal 210 and a service terminal guard module 220. 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.

[0032] In an embodiment 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.

[0033] 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.

[0034] 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 networks, 5G cellular networks, 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 collaborative frequency switching for service base station nodes or service terminal nodes to avoid interference.

[0035] It should be understood that in the embodiments of the present invention, the service terminal deploys a service terminal guard module to construct a guard network with the service base station guard module deployed in the service base station. The service terminal guard module receives the frequency switching control instruction from the service base station guard module, and this instruction notifies the occurrence time and target frequency of the frequency change of the service terminal node. The service terminal guard module assists the service terminal to directly switch the air interface frequency of its own hardware platform to the target frequency when the occurrence time of the frequency change arrives, ensuring that the service terminal node and the service base station node synchronously change the air interface frequency, 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 strategy, the cellular network can be made to sense the air interface spectrum situation in real time and avoid interference.

[0036] It should be noted that when the service terminal does not deploy the terminal guard module, the frequency of the service terminal needs to implement the initial frequency determination and frequency switching through the standard 3GPP protocol. However, due to the problem of poor anti-interference ability of the 3GPP protocol itself, the communication system provided by the present invention can, by deploying the service terminal guard module on the service terminal, receive the frequency switching control instruction of the service base station guard module in real time, convert the instruction content into a frequency switching control notification message and transmit it to the service terminal, and the service terminal then controls its own radio frequency transceiver, radio frequency front end and antenna according to this message to establish a radio frequency path corresponding to the target frequency and lock the frequency to the target frequency, so as to be able to bypass the standard 3GPP protocol processing procedure and effectively improve the anti-interference ability of the cellular network.

[0037] As another embodiment of the present invention, a service terminal node 200 is provided, as Figure 2 shown, including: a service terminal 210 and a service base station guard module 220. The service terminal 210 at least includes an application processing unit 211, a communication processing unit 212, a radio frequency transceiver 213, a radio frequency front end 214 and an antenna 215. The application processing unit 211 is connected to the peripheral interface, the communication processing unit 212 is communicatively connected to the application processing unit 211, and the communication processing unit 212 includes a frequency switching control device 300 described below; the communication processing unit 212 is connected to the service terminal guard module 220 through a control interface; The radio frequency transceiver 213 is communicatively connected to the communication processing unit 212, the radio frequency front end 214 is communicatively connected to the radio frequency transceiver 213, the radio frequency transceiver 213 can support k frequency bands, the radio frequency front end 214 includes n channels, and the number of antennas 215 is m; k, m and n are all natural numbers greater than or equal to 1; When k = n = m, when the communication processing unit 212 receives the frequency switching control notification message from the service terminal guard module 220 and determines that frequency switching is to be performed, it locks the air interface frequency of the radio frequency transceiver 213 to the target frequency, so that the radio frequency transceiver 213, the channels of the radio frequency front end 214, and the antenna 215 establish a radio frequency path corresponding to the target frequency.

[0038] It should be understood that in the embodiments of the present invention, the m antennas are all independent and are all connected to the radio frequency front end through switches.

[0039] In the embodiments of the present invention, the communication processing unit 212 can directly receive the frequency switching control notification message transmitted by the service terminal guard module 220, and can determine whether to perform frequency switching according to the message when receiving the frequency switching control notification message. When it is determined that frequency switching is to be performed, it can directly control the air interface frequency of the radio frequency transceiver 213 to be locked to the target frequency.

[0040] Specifically, in the embodiments of the present invention, the communication processing unit 212 specifically implements the control of frequency switching and the processing of messages through the frequency switching control device 300.

[0041] In the embodiments of the present invention, the frequency switching control device 300, as Figure 3 shown, includes: A verification module 310, configured to, when receiving the frequency switching control notification message transmitted by the service terminal guard module, perform consistency verification on the current resident cell ID of the service terminal and the frequency switching cell ID; the service terminal guard module can receive the frequency switching control instruction sent by the service base station guard module through the guard network and generate a frequency switching control notification message according to the frequency switching control instruction; the frequency switching control notification message at least includes the frequency switching cell ID, the target frequency, and the effective time; A determination module 320, configured to determine that the consistency verification of the frequency switching control notification message passes if the current resident cell ID is consistent with the frequency switching cell ID, and determine whether the current effective time has arrived; A frequency switching module 330, configured to lock the air interface frequency of the service terminal to the target frequency if the current effective time has arrived.

[0042] It should be understood that through the consistency verification of the frequency switching cell ID in the received frequency switching control notification message, and then judging whether the current effective time has arrived after the consistency verification passes. When the effective time also arrives, the air interface frequency of the radio frequency transceiver is controlled to be locked to the target frequency, thereby realizing the control of frequency switching.

[0043] The following details the process of locking the air interface frequency.

[0044] In order to understand the process of air interface frequency switching of the present invention, first, the locking principle of the current existing air interface frequency is described.

[0045] In the cellular network system, if a service terminal wants to communicate, it first needs to search for and access a cell, and then the cell provides communication services for it. During this process, the access frequency of the service terminal is the configured frequency of the cell deployed by the service base station, and the air interface frequency of the service terminal must be the same as the air interface frequency of the cell to maintain the service.

[0046] Typical cellular network service terminal devices can mostly support multiple different frequency bands defined by the International Telecommunication Union Radiocommunication Sector (ITU-R) 3GPP in terms of hardware capabilities. For example, domestic 5G cellular network service terminals may support multiple different frequency bands such as 700 MHz, 2.6 GHz, 3.3 GHz, 3.5 GHz, 4.9 GHz, etc. However, specifically for a cell, according to the 3GPP standard definition, it can only operate on one frequency point (frequency). Therefore, when a service terminal accesses a specific cell, it will lock to the air interface frequency of that cell.

[0047] As Figure 4 shown in the schematic diagram of the functional modules of a typical service terminal, if the number of frequency bands supported by the transceiver of the service terminal is k, these frequency bands require n different radio frequency front-end channels to support, and at the same time, m different antennas are required to cover these frequency bands. Then, when k, n, and m are all not equal, after the service terminal node determines the air interface frequency, it will lock the frequency band of the radio frequency transceiver to the frequency band corresponding to the air interface frequency (for example, the corresponding frequency band 1 in the figure), and at the same time, through devices such as switches, select the appropriate radio frequency front-end transceiver channel (for example, the corresponding channel 2 in the figure) and antenna (for example, the corresponding antenna m in the figure) to ensure that the service terminal node can work normally at the air interface frequency of the cell.

[0048] When k is equal to n, the service terminal can cancel switch 1 and directly connect the frequency band interface of the radio frequency transceiver to the corresponding radio frequency front-end channel; when n is equal to m, the service terminal can cancel switch 2 and directly connect the channel of the radio frequency front-end to the corresponding antenna. As Figure 5 shown, when k, n, and m are all equal, the service terminal can cancel switch 1 and switch 2 and directly lock the operating frequency band of the radio frequency transceiver to the frequency band corresponding to the air interface frequency of the cell, that is, only need to set the operating frequency band interface of the radio frequency transceiver, and the channels and antennas of the radio frequency front-end are already matched and connected.

[0049] The time for the frequency band switching of the radio frequency transceiver and the switch switching in the above process is very short, usually on the order of microseconds.

[0050] In the embodiment of the present invention, as Figure 2As shown, a service terminal guard module is deployed on the service terminal side. The service terminal guard module has communication networking capabilities and can receive frequency switching control instructions from the service base station guard module through the air interface to achieve cooperative frequency control with the service base station.

[0051] It should be understood that in the embodiments of the present invention Figure 2 the structure shown indicates the case where k, m, and n are all equal.

[0052] When k is not equal to n, as Figure 6a shown, the service terminal 200 further includes a first switch 216. The first switch 216 is located between the radio frequency transceiver 213 and the radio frequency front end 214. One end of the first switch 216 is connected to the radio frequency transceiver 213, and the other end of the first switch 216 is connected to the radio frequency front end 214. The first switch 216 can select a matching channel to be matched and connected to the frequency band of the radio frequency transceiver 213; When m is not equal to n, as Figure 6b shown, the service terminal 200 further includes a second switch 217. The second switch 217 is located between the radio frequency front end 214 and the antenna 215. The channels of the radio frequency front end 214 are connected to the antenna 215 through the second switch 217. The second switch 217 can select a matching antenna 215 to be matched and connected to the channels of the radio frequency front end 214; When k, m, and n are all not equal, as Figure 6c shown, the service terminal 200 further includes a first switch 216 and a second switch 217. The first switch 216 is located between the radio frequency transceiver 213 and the radio frequency front end 214. One end of the first switch 216 is connected to the radio frequency transceiver 213, and the other end of the first switch 216 is connected to the radio frequency front end 214. The first switch 216 can select a matching channel to be matched and connected to the frequency band of the radio frequency transceiver 213; the second switch 217 is located between the radio frequency front end 214 and the antenna 215. The channels of the radio frequency front end 214 are connected to the antenna 215 through the second switch 217. The second switch 217 can select a matching antenna 215 to be matched and connected to the channels of the radio frequency front end 214.

[0053] In the embodiments of the present invention, the service terminal further includes a memory structure, specifically as Figure 2 shown, which may include a DDR and an eMMC memory structure, and both memory structures are communicatively connected to the application processing unit.

[0054] The service terminal node provided by the present invention can receive the frequency switching control instruction from the service base station node through the guard network by setting up a service terminal guard module and a frequency switching control device in the communication processing unit, and directly switch the air interface frequency of the service terminal hardware platform at the effective moment indicated by the instruction. This process can achieve synchronous and rapid cooperation between the cellular network service base station node and the service terminal node to switch frequencies and avoid interference without affecting the normal operation of the protocol stack of the service terminal, thus significantly improving the anti-interference performance of the cellular network.

[0055] As another embodiment of the present invention, a frequency switching control method is provided, which 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 guard module can be communicatively connected to a service base station guard module in the service base station node to form a guard network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network. As Figure 7 shown, the frequency switching control method includes: S100. When receiving the frequency switching control notification message transmitted by the service terminal guard module, perform consistency verification on the current resident cell ID of the service terminal and the frequency switching cell ID. The service terminal guard module can receive the frequency switching control instruction sent by the service base station guard module through the guard network and generate a frequency switching control notification message according to the frequency switching control instruction. The frequency switching control notification message at least includes the frequency switching cell ID, the target frequency, and the effective moment. In the embodiment of the present invention, when the service terminal guard module receives the frequency switching control instruction, it can generate a frequency switching control notification message according to the frequency switching control instruction.

[0056] In the embodiment of the present invention, the frequency switching control instruction at least includes parameters such as a message sequence number, a service base station node ID, a frequency switching cell ID, a target frequency, and an effective moment. And the frequency switching control notification message generated by the service terminal guard module according to the frequency switching control instruction at least includes parameters such as the frequency switching cell ID (corresponding to the frequency switching cell ID of the frequency switching control instruction), the target frequency (corresponding to the target frequency of the frequency switching control instruction), and the effective moment (corresponding to the effective moment of the frequency switching control instruction).

[0057] S200. If the current resident cell ID is consistent with the frequency switching cell ID, determine that the consistency verification of the frequency switching control notification message passes, and judge whether the current effective moment has arrived. Perform consistency verification on the frequency switching cell ID to determine whether the current resident cell ID of the cell is consistent with the frequency switching cell ID. If they are consistent, the consistency verification passes.

[0058] After the consistency check passes, it is determined whether the current effective time has arrived. Whether it has arrived can mean that it has arrived or that it has expired. That is, if the current effective time has arrived or has expired, it can be determined that the current time has arrived.

[0059] S300. If the current effective time has arrived, lock the radio interface frequency of the service terminal node to the target frequency.

[0060] When the current effective time has arrived, lock the radio interface frequency of the radio frequency transceiver of the service terminal to the target frequency, so as to establish a radio frequency path corresponding to the target frequency for the radio frequency transceiver, the radio frequency front end, and the antenna.

[0061] The frequency switching control method provided by the present invention receives a frequency switching control instruction from a service base station node through a service terminal guard module, and directly switches the radio interface frequency of the service terminal hardware platform at the effective time indicated by the instruction. This process can achieve synchronous and fast coordination of frequency switching between the cellular network service base station node and the service terminal node to avoid interference without affecting the normal operation of the protocol stack of the service terminal, achieving the effect of greatly improving the anti-interference performance of the cellular network.

[0062] It should be understood that if the current effective time has not arrived, save the frequency switching control notification message until the current effective time arrives and then lock the radio interface frequency of the service terminal node to the target frequency.

[0063] In addition, if the effective time of the previously received frequency switching control notification message has not arrived and the consistency check of the currently received frequency switching control notification message passes, stop monitoring the effective time of the previously received frequency switching control notification message, and process it according to whether the current effective time of the currently received frequency switching control notification message has arrived.

[0064] In addition, if the current resident cell ID is inconsistent with the frequency switching cell ID, it is determined that the consistency check of the frequency switching control notification message fails, and the frequency switching control notification message is discarded.

[0065] It can be understood that locking the radio interface frequency of the service terminal to the target frequency includes: Controlling the radio frequency transceiver, radio frequency front end, and antenna of the service terminal to establish a radio frequency path corresponding to the target frequency.

[0066] For the convenience of understanding the process of frequency switching of the service terminal node, a further detailed description is given.

[0067] Specifically, after receiving the frequency switching control notification message, the service terminal node first performs a check on the cell ID.

[0068] a. If the cell ID of the cell where the service terminal currently camps is inconsistent with the cell ID in the frequency handover control notification message, discard the frequency handover control instruction; b. If the cell ID of the cell where the service terminal currently camps is consistent with the cell ID in the frequency handover control notification message (i.e., the service terminal currently camps in this cell), then: a1. If the current effective time arrives or has expired, the communication processing unit in the service terminal will directly modify the air interface frequency of the radio frequency transceiver, lock it to the target frequency, and establish the radio frequency path corresponding to the target frequency (i.e., the radio frequency transceiver channel, radio frequency front-end channel, and corresponding antenna corresponding to the target frequency); a2. If the current effective time has not arrived, the service terminal only saves the message parameters, and after the effective time arrives, processes them according to step a1; c. When the service terminal receives a new frequency handover control instruction before the previous received frequency handover control instruction reaches the effective time, and the new frequency handover control instruction passes the verification such as the cell ID, the service terminal will stop the behavior of the previous frequency handover control instruction, and then perform subsequent processing according to step b.

[0069] In the embodiment of the present invention, the service terminal directly modifies the frequency of the hardware platform (mainly referring to the radio frequency transceiver and radio frequency front end) according to the target frequency without the need for the cellular network protocol stack to process. That is, although the air interface frequency of the service terminal node has changed, the cellular network protocol stack believes that the access frequency of the service terminal (in the embodiment of the present invention, the access frequency of the service terminal refers to the configured frequency of the cell where the service terminal accesses the service base station) remains unchanged. That is, the change of the air interface frequency of the service terminal node is only affected by the external frequency handover control notification message and has nothing to do with the cellular network protocol stack. At the same time, the cellular network protocol stack cannot perceive the change of the air interface frequency of the service terminal node.

[0070] It should be noted here that in the embodiment of the present invention, the access frequency of the service terminal is the configured frequency of the cell where it accesses the service base station. After accessing the cell where the service base station is deployed, because the service terminal guard module is deployed on the service terminal, and the service terminal guard module can receive the external frequency handover control notification message, the radio frequency transceiver and radio frequency front end in the service terminal can lock the target frequency according to the frequency handover control notification message, that is, lock the air interface frequency of the service terminal node to the target frequency, while the access frequency of the service terminal itself remains unchanged; the air interface frequency of the service terminal node has nothing to do with the cellular network protocol stack.

[0071] In the embodiment of the present invention, the frequency handover control method further includes the following steps before receiving the frequency handover control notification message transmitted by the service terminal guard module: When receiving the frequency switching control notification message transmitted by the service terminal guard module, lock the air interface frequency of the service terminal node to the target frequency specified in the frequency switching control notification message; Wherein, after establishing a guard network with the service base station guard module, the service terminal guard module can generate a frequency switching control notification message according to the received signal quality of different service base station guard modules and the air interface frequency indication instruction, and the frequency switching cell ID and target frequency of the frequency switching control notification message correspond to the optimal working cell and the corresponding air interface frequency determined by the service terminal guard module according to the signal quality and the air interface frequency indication instruction.

[0072] It should be understood that the frequency control process of the service terminal node during network access can specifically include: 1) The service base station guard module periodically sends an air interface frequency indication instruction currently used by the service base station through the guard network, which is used to indicate the air interface frequency that the service terminal node should lock when accessing the network. The air interface frequency indication instruction at least includes parameters such as a message sequence number, a service base station ID, a working cell ID, a cell configuration frequency, a cell air interface frequency, and a transmission power; 2) After the service terminal node is powered on or enters the cell coverage area, the service terminal guard module will first establish a communication link with the service base station guard module (i.e., establish a guard network first); 3) Based on the received signal quality of different service base station guard modules and the air interface frequency indication instruction, the service terminal guard module selects the optimal working cell and notifies the service terminal (i.e., the radio transceiver and radio frequency front end included in the service terminal) to lock the air interface frequency; 4) The service terminal guard module notifies the service terminal of the air interface frequency information of the selected cell through a frequency switching control notification message, including parameters such as a message sequence number, a frequency switching cell ID (corresponding to the working cell ID in the air interface frequency indication instruction), and a target frequency (corresponding to the cell air interface frequency in the air interface frequency indication instruction); 5) After receiving the frequency switching control notification message, the service terminal directly locks the frequency of the hardware platform (radio transceiver and radio frequency front end) to the target frequency specified in the frequency switching control notification message. This process does not involve the protocol stack processing of the cellular network, that is, the access frequency determined by the protocol stack can be different from the air interface frequency of the service terminal node.

[0073] Therefore, in the embodiment of the present invention, the protocol stack of the service terminal performs terminal network access operations according to the received air interface information, and the protocol stack behavior of the service terminal will not change the air interface frequency of the physical device.

[0074] It should be noted that in the embodiments of the present invention, although the communication processing unit can still receive the information of the protocol stack during normal operation, for the content of the air interface frequency and frequency switching in the protocol stack, the communication processing unit only realizes it through the frequency switching control notification message of the service terminal guard module. For other messages of the protocol stack regarding the service network and the like, they are still realized according to the behavior of the protocol stack. That is, the content regarding frequency switching and air interface frequency setting in the present invention is all taken over and realized by the service terminal guard module. When specifically implementing, it can be achieved by setting priorities for the implementation content, or by setting switches in the communication processing unit, so that the communication processing unit only obtains the notification of the service terminal guard module when locking the frequency of the radio frequency transceiver, thereby achieving the purpose that the protocol stack does not control the air interface frequency of the service terminal, and the control of the air interface frequency of the service terminal is only triggered and changed by the service terminal guard module, thus improving the anti-interference ability of the cellular network.

[0075] The following combines Figure 8 to exemplify and explain the specific working process of the frequency switching control method of the present invention.

[0076] As Figure 8 shown in the network, both the service base station and the service terminal comply with the 5G standard, and a 5G service network is constructed through the 5G protocol. Among them, the service base station 1 deploys one cell, that is, the cell ID corresponding to the service base station 1 is 1, and the service base station 2 deploys one cell, that is, the cell ID corresponding to the service base station 2 is 2; the service terminal 1 and the service terminal 2 have accessed the network and camped in cell 1. The service terminal 3 is located at the coverage edge of cell 1 and cell 2 and can receive signals from both the service base station 1 and the service base station 2, but has not yet accessed the network; the service base station guard modules of the service base station 1, the service terminal guard modules of the service terminal 1 and the service terminal 2 have formed an independent guard network from 5G through multi-hop ad hoc networking; when the service terminal 3 is powered on, it will proceed as follows: 1) The service terminal guard module of the service terminal 3 first establishes a guard network to the service base station guard modules of the service base station 1 and the service base station 2 and the service terminal guard module of the service terminal 2. Through the guard network, the service terminal guard module of the service terminal 3 can communicate bidirectionally with the service base station guard modules of the service base station 1 and the service base station 2. 2) The service terminal guard module of the service terminal 3 starts to receive the air interface frequency indication instruction timer, and only collects the air interface frequency indication instructions from the service base station guard module before the timer times out, without controlling the frequency of the service terminal. Figure 8The service terminal guard module of service terminal 3 can collect the air interface frequency indication commands from the service base station guard module of service base station 1 and the service base station guard module of service base station 2; 3) The timer for waiting to receive the air interface frequency indication command times out (assuming that the air interface frequency indication commands received from the service base station guard module of the latest service base station 1 include the following information: message sequence number (100), service base station node ID (1), working cell ID (1), cell air interface frequency (F1), transmit power (40 dBm); the air interface frequency indication commands received from the service base station guard module of the latest service base station 2 include the following information: message sequence number (210), service base station node ID (2), working cell ID (2), cell air interface frequency (F2), transmit power (40 dBm), and the service terminal guard module of service terminal 3 compares the air interface frequency indication commands received from the service base station guard module of service base station 1 and the service base station guard module of service base station 2, and selects the service base station with the best signal (such as service base station 2); 4) After the service terminal guard module of service terminal 3 generates a frequency switching control notification message (message sequence number (456), frequency switching cell ID (2), target frequency (F2)) according to the air interface frequency indication sent by the service base station guard module of service base station 2 received, it notifies service terminal 3 through the control interface of service terminal 3 to directly modify the frequency of the hardware platform (radio frequency transceiver and radio frequency front end), lock it to the air interface frequency F2, and establish the radio frequency transceiver frequency band, radio frequency front end channel and the path of the corresponding antenna corresponding to the air interface frequency F2; 5) At this point, the air interface frequency of the service terminal node will be consistent with that of cell 2. Therefore, service terminal 3 will be able to receive information such as synchronization signals and system messages sent on the air interface of cell 2; 6) The 5G protocol stack of service terminal 3 completes air interface synchronization and identifies the cell according to the received air interface information of cell 2, then parses the system message of the cell, and initiates an air interface access process on the random access channel of the cell according to the information indicated by the system message; during the above process, service terminal 3 does not modify the access frequency actually used by itself; 7) After service terminal 3 accesses the cell, it can camp on this cell and work normally.

[0077] The service base station guard module of service base station 1 and the service base station guard module of service base station 2 sense the air interface spectrum situation, including the interference state perception of the current 5G cell air interface frequency and the interference state perception of the available frequencies of the 5G cell. When the service base station guard module of service base station 1 identifies that the current 5G cell air interface frequency F1 is interfered, and there is another available idle frequency F3, it will initiate a collaborative frequency handover. The process is as follows: 1) The service base station guard module of service base station 1 generates a frequency switching control instruction, which includes parameters such as message sequence number (378), service base station node ID (1), frequency switching cell ID (Cell 1), target frequency (F3), effective time (frame number 37, sub-frame number 0), and current time (frame number 35, sub-frame number 7); 2) The service base station guard module of service base station 1 broadcasts and notifies the service terminal guard modules of service terminal 1, service terminal 2, and service terminal 3 of this frequency switching control instruction through the guard network. To ensure the reliability of transmission, this frequency switching control instruction can be repeatedly sent multiple times; 3) At the effective time indicated by the frequency switching control instruction, the service base station guard module of service base station 1 assists the service base station to switch the frequency from F1 to F3. During this process, the air interface protocol remains unchanged, that is, the service base station is insensitive to the frequency switching (the protocol behavior of the service base station before and after the frequency switching remains unchanged); 4) After receiving this frequency switching control instruction, the service terminal guard module extracts the parameters of the instruction to generate a frequency switching control notification message and sends it to the corresponding service terminal through the control interface (the parameters include: cell ID (1), target frequency (F3), effective time (frame number 37, sub-frame number 0)); 5) After receiving this instruction, service terminal 1 and service terminal 2 can perform verification through the cell ID. Therefore, when the effective time indicated by the instruction arrives, they directly modify the frequency of their own hardware platforms from F1 to F3, that is, establish the connection paths of the radio frequency transceiver frequency band, radio frequency front-end channel, and antenna corresponding to F3; 6) After receiving this instruction, service terminal 3 cannot pass the cell ID verification, so it discards this message.

[0078] The frequency switching control method provided by the present invention relies on the device capabilities of the service terminal hardware platform to support multiple different frequency bands. By introducing the service terminal guard module, an independent guard network can be formed with the service base station guard module, independent of the cellular network protocol system. The service terminal node receives the frequency switching control instruction from the service base station node through the guard network and directly switches the air interface frequency of the service terminal hardware platform at the effective time indicated by the instruction. This process can achieve synchronous and rapid coordination of frequency switching between the cellular network service base station node and the service terminal node to avoid interference without affecting the normal operation of the protocol stack of the service terminal, achieving the effect of significantly improving the anti-interference performance of the cellular network.

[0079] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle 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 frequency switching control method, characterized in that, Applied to a service terminal node, the service terminal node includes a service terminal and a service terminal protection module communicatively connected to the service terminal. The service terminal protection module can be communicatively connected to a service base station protection module in a service base station node to form a protection network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network; The frequency switching control method includes: When receiving a frequency switching control notification message transmitted by the service terminal protection module, perform consistency verification on the current resident cell ID of the service terminal and the frequency switching cell ID; the service terminal protection module can receive a frequency switching control instruction sent by the service base station protection module through the protection network and generate a frequency switching control notification message according to the frequency switching control instruction; the frequency switching control notification message at least includes a frequency switching cell ID, a target frequency, and an effective time; If the current resident cell ID is consistent with the frequency switching cell ID, it is determined that the consistency verification of the frequency switching control notification message passes, and it is judged whether the current effective time has arrived; If the current effective time has arrived, lock the air interface frequency of the service terminal node to the target frequency.

2. The frequency switching control method according to claim 1, wherein If the current effective time has not arrived, save the frequency switching control notification message until the current effective time arrives and then lock the air interface frequency of the service terminal node to the target frequency.

3. The frequency switching control method according to claim 1, wherein If the effective time of the previously received frequency switching control notification message has not arrived and the consistency verification of the currently received frequency switching control notification message passes, stop monitoring the effective time of the previously received frequency switching control notification message and process it according to whether the current effective time of the currently received frequency switching control notification message has arrived.

4. The frequency switching control method according to claim 1, wherein If the current resident cell ID is inconsistent with the frequency switching cell ID, it is determined that the consistency verification of the frequency switching control notification message fails, and the frequency switching control notification message is discarded.

5. The frequency switching control method according to any one of claims 1 to 4, characterized in that The frequency switching control method further includes the following steps performed before receiving the frequency switching control notification message transmitted by the service terminal protection module: When receiving the frequency switching control notification message transmitted by the service terminal protection module, lock the air interface frequency of the service terminal node to the target frequency specified in the frequency switching control notification message; Among them, after establishing a protection network with the service base station protection module, the service terminal protection module can generate a frequency switching control notification message according to the signal quality of different service base station protection modules received and the air interface frequency indication instruction. The frequency switching cell ID and the target frequency of the frequency switching control notification message correspond to the optimal working cell and the corresponding air interface frequency determined by the service terminal protection module according to the signal quality and the air interface frequency indication instruction.

6. The frequency switching control method according to any one of claims 1 to 4, characterized in that Locking the air interface frequency of the service terminal node to the target frequency includes: Controlling the radio frequency transceiver, radio frequency front end, and antenna of the service terminal to establish a radio frequency path corresponding to the target frequency.

7. A frequency switching control device, characterized in that, Applied to a service terminal node, the service terminal node includes a service terminal and a service terminal protection module communicatively connected to the service terminal. The service terminal protection module can be communicatively connected to a service base station protection module in a service base station node to form a protection network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network; The frequency switching control device includes: A verification module, configured to perform consistency verification on the current resident cell ID of the service terminal and the frequency switching cell ID when receiving a frequency switching control notification message transmitted by the service terminal protection module. The service terminal protection module can receive a frequency switching control instruction sent by the service base station protection module through the protection network and generate a frequency switching control notification message according to the frequency switching control instruction. The frequency switching control notification message at least includes a frequency switching cell ID, a target frequency, and an effective time; A determination module, configured to determine that the consistency verification of the frequency switching control notification message passes if the current resident cell ID is consistent with the frequency switching cell ID, and determine whether the current effective time has arrived; A frequency switching module, configured to lock the radio interface frequency of the service terminal node to the target frequency if the current effective time has arrived.

8. A service terminal node, characterized in that, Including: A service terminal and a service terminal protection module. The service terminal at least includes an application processing unit, a communication processing unit, a radio frequency transceiver, a radio frequency front end, and an antenna. The application processing unit is connected to a peripheral interface. The communication processing unit is communicatively connected to the application processing unit. The communication processing unit includes the frequency switching control device according to claim 7. The communication processing unit is connected to the service terminal protection module through a control interface; The radio frequency transceiver is communicatively connected to the communication processing unit, the radio frequency front end is communicatively connected to the radio frequency transceiver, the antenna is communicatively connected to the radio frequency front end. The radio frequency transceiver can support k frequency bands, the radio frequency front end includes n channels, and the number of antennas is m. k, m, and n are all natural numbers greater than or equal to 1; When k = n = m, the communication processing unit can lock the radio interface frequency of the radio frequency transceiver to the target frequency when receiving the frequency switching control notification message from the service terminal protection module and determining that frequency switching is to be performed, so that the radio frequency transceiver, the channels of the radio frequency front end, and the antenna establish a radio frequency path corresponding to the target frequency.

9. The service terminal node according to claim 8, wherein When k is not equal to n, the service terminal further includes a first switch located between the radio frequency transceiver and the radio frequency front end. One end of the first switch is connected to the radio frequency transceiver, and the other end of the first switch is connected to the radio frequency front end. The first switch can select a matching channel to be matched and connected to the frequency band of the radio frequency transceiver; When m is not equal to n, the service terminal further includes a second switch, which is located between the RF front end and the antenna. The channels of the RF front end are connected to the antenna through the second switch, and the second switch can select a matching antenna to be connected to the channels of the RF front end for matching. When k, m, and n are all not equal, the service terminal further includes a first switch and a second switch. The first switch is located between the RF transceiver and the RF front end. One end of the first switch is connected to the RF transceiver, and the other end of the first switch is connected to the RF front end. The first switch can select a matching channel to be connected to the frequency band of the RF transceiver for matching; the second switch is located between the RF front end and the antenna. The channels of the RF front end are connected to the antenna through the second switch, and the second switch can select a matching antenna to be connected to the channels of the RF front end for matching.

10. A communication system, characterized in that, It includes a service base station node and the service terminal node according to claim 8 or 9 that is communicatively connected to the service base station node. The service base station node includes a service base station and a service base station protection module. The service terminal node includes a service terminal and a service terminal protection module. The communication connection between the service base station and the service terminal can form a service network, and the communication connection between the service base station protection module and the service terminal protection module can form a protection network.

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