Cell switching control method and device of communication system and communication system

Abstract

The invention relates to the technical field of wireless communication, and particularly discloses a cell switching control method and device of a communication system and the communication system, and the method comprises the steps: receiving a working frequency indication instruction message sent by at least one service base station guard module in real time; when the target cell needing to be switched by the current service terminal is determined, judging whether switching parameter information of the target cell exists or not; if the switching parameter information of the target cell does not exist, sending a switching parameter information request to a service base station guard module corresponding to the target cell; and if the switching parameter information of the target cell exists, or the switching parameter information returned by the service base station guard module is received within the preset time, the switching parameter information of the target cell is sent to the service terminal, and then the air interface frequency of the current service terminal node is locked to the air interface frequency corresponding to the target cell. According to the cell switching control method of the communication system provided by the invention, the cell switching speed can be improved, and the service interruption time can be shortened.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a cell switching control method of a communication system, a cell switching control device of a communication system, and a communication system. Background Art

[0002] Commercial cellular network technology represented by 5G, with its many excellent features such as large bandwidth, low latency, and ultra-large-scale networking, has significantly changed people's lifestyles and promoted rapid social progress. Commercial cellular networks all operate at specific operating frequencies, which are not allowed to be used by other wireless devices to prevent interference with communications. When cellular networks are applied to special fields, due to the lack of anti-interference capabilities of cellular networks, when encountering interference, it may cause communication degradation or even business interruption. The use of frequency conversion equipment to synchronously change the air interface frequency of the cellular network base station and the terminal side can achieve network coordinated frequency switching to avoid interference. However, when the terminal moves between base stations, due to the introduction of frequency conversion equipment, it is difficult for the service terminal to effectively measure the neighboring cell signals, and it is impossible to know the information of the adjacent cells in advance, resulting in long cross-cell switching time and even business interruption.

[0003] Therefore, how to quickly obtain the information of the switching target cell to improve the switching speed of the service terminal 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 cell switching control method of a communication system, a cell switching control device of a communication system and a communication system, which solve the problem in the related art that the terminal equipment takes too long to switch between adjacent cells, thus causing service interruption.

[0005] As a first aspect of the present invention, a cell switching control method of a communication system is provided, wherein the method 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 and form a guard network, and the service terminal can be communicatively connected to a service base station in the service base station node and form a service network; the cell switching control method of the communication system includes:

[0006] receiving in real time a working frequency indication instruction message sent by a guard module of at least one service base station, wherein the current service terminal resides in a source cell deployed by a first service base station, and at least one working cell adjacent to the source cell is formed as a target cell;

[0007] When the target cell to which the current service terminal needs to switch has been determined, determining whether there is switching parameter information of the target cell;

[0008] If there is no handover parameter information for the target cell, a handover parameter information request is sent to the service base station guard module corresponding to the target cell, where the service base station guard module can determine whether it currently has handover parameter information based on the handover parameter information request and can return the handover parameter information when there is handover parameter information;

[0009] If there is handover parameter information for the target cell, or if the handover parameter information returned by the service base station guard module is received within a preset time, the handover parameter information of the target cell is sent to the service terminal and then the radio interface frequency of the current service terminal node is locked to the radio interface frequency corresponding to the target cell to complete the handover of the current service terminal from the source cell to the target cell.

[0010] Further, the cell handover control method of the communication system further includes:

[0011] If there is no handover parameter information for the target cell and the handover parameter information returned by the service base station guard module is still not received within a preset time, the radio interface frequency of the current service terminal node is locked to the radio interface frequency corresponding to the target cell, and the system message of the target cell is obtained through the passive radio interface reception method of the service terminal to complete the handover of the current service terminal from the source cell to the target cell.

[0012] Further, the cell handover control method of the communication system further includes the steps before when it has been determined that the target cell to which the current service terminal needs to hand over:

[0013] Determine whether the operating frequency indication command message received by the current service terminal is sent by the source cell;

[0014] If not, determine the arrival equivalent path loss of the service base station corresponding to the operating frequency indication command message;

[0015] Determine the target cell of the current service terminal according to the arrival equivalent path loss.

[0016] Further, determining the arrival equivalent path loss of the service base station corresponding to the operating frequency indication command message includes:

[0017] Calculate the arrival normalized path loss of the service base station guard module according to the transmit power of the service base station guard module in the operating frequency indication command message, the guard radio interface reception power of the current service terminal guard module, and the guard radio interface reception frequency. The calculation formula is:

[0018] PLn = transmit power of the service base station guard module - guard radio interface reception power of the service terminal guard module - 20lgFs + Δ1,

[0019] Among them, PLn represents the arrival normalized path loss of the service base station guard module, Fs represents the receiving frequency of the guard air interface of the current service terminal guard module, and Δ1 represents the first correction factor;

[0020] Calculate the arrival equivalent path loss of the service base station according to the arrival normalized path loss of the service base station guard module and the air interface frequency of the corresponding cell deployed by the service base station. The calculation formula is:

[0021] Ple = PLn + 20lgFd + Δ2,

[0022] Among them, Ple represents the arrival equivalent path loss of the service base station, Fd represents the air interface frequency of the cell deployed by the service base station, and Δ2 represents the second correction factor.

[0023] Furthermore, determining the target cell of the current service terminal according to the arrival equivalent path loss information includes:

[0024] Determine whether the arrival equivalent path loss corresponding to the service base station where the current source cell is located is greater than a first preset threshold;

[0025] If the arrival equivalent path loss corresponding to the service base station where the current source cell is located is greater than the first preset threshold, and the arrival equivalent path loss of the service base station where the currently received working cell is located is less than the preset target value, then determine that the working cell is the target cell of the current service terminal;

[0026] If the arrival equivalent path loss corresponding to the service base station where the current source cell is located is not greater than the first preset threshold, then no action is taken;

[0027] Among them, the arrival equivalent path loss of the service base station where the currently received working cell is located is less than the preset target value, including:

[0028] The current arrival equivalent path loss of the service base station where the currently received working cell is located is less than a second preset threshold, and among the consecutive N arrival equivalent path losses of the service base station where the currently received working cell is located, M are less than the second preset threshold. Both M and N are natural numbers greater than or equal to 1, and N is greater than or equal to M.

[0029] As another aspect of the present invention, there is provided a cell handover control method for a communication system. Among them, it 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 guard module can be communicatively connected to a service terminal guard module in a service terminal node to form a guard network, and the service base station can be communicatively connected to a service terminal in a service terminal node to form a service network; the cell handover control method for the communication system includes:

[0030] Periodically send an instruction message indicating its current working frequency through the guard network;

[0031] When the current service terminal resident in the source cell has determined the target cell to be switched, and the service terminal guard module of the current service terminal resident in the source cell does not have the handover parameter information of the target cell, receive the handover parameter information request of the service terminal guard module; wherein, the current service terminal resides in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms the target cell;

[0032] Judge whether there is handover parameter information currently according to the handover parameter information request;

[0033] When it is determined that there is handover parameter information currently, send the handover parameter information to the service terminal guard module; the service terminal guard module can, according to the handover parameter information received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the air interface frequency of the current service terminal node to the air interface frequency corresponding to the target cell to complete the handover of the current service terminal from the source cell to the target cell.

[0034] Further, the cell handover control method of the communication system further includes:

[0035] If it is determined that there is no handover parameter information currently, send a handover parameter information request to the service base station, and the service base station can return the handover parameter information according to the handover parameter information request;

[0036] Receive the handover parameter information returned by the service base station and send the handover parameter information to the service terminal guard module.

[0037] As another aspect of the present invention, there is provided a cell handover control device for a communication system, which is used to implement the cell handover control method of the communication system described above. 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 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 a service base station node to form a service network; the cell handover control device of the communication system includes:

[0038] A first receiving module, configured to receive in real time a working frequency indication instruction message sent by at least one service base station guard module, wherein the current service terminal resides in a source cell deployed by a first service base station, and at least one working cell adjacent to the source cell forms a target cell;

[0039] The first judgment module is used to judge whether there is handover parameter information of the target cell when it has been determined the target cell to which the current service terminal needs to handover.

[0040] The first sending module is used to, if there is no handover parameter information of the target cell, send a handover parameter information request to the service base station guard module corresponding to the target cell, where the service base station guard module can determine whether it currently has handover parameter information according to the handover parameter information request, and can return the handover parameter information when there is handover parameter information.

[0041] The handover module is used to, if there is handover parameter information of the target cell, or receive the handover parameter information returned by the service base station guard module within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

[0042] As another aspect of the present invention, there is provided a cell handover control device for a communication system, which is used to implement the cell handover control method of the communication system described above. It is applied to a service base station node, and 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 can be communicatively connected to a service terminal guard module in a service terminal node to form a guard network, and the service base station can be communicatively connected to a service terminal in the service terminal node to form a service network. The cell handover control device for the communication system includes:

[0043] The second sending module is used to periodically send a message of its own current working frequency indication instruction through the guard network.

[0044] The second receiving module is used to receive a handover parameter information request from the service terminal guard module when the current service terminal staying in the source cell has determined the target cell to which it needs to handover and the service terminal guard module of the current service terminal staying in the source cell does not have the handover parameter information of the target cell. Wherein, the current service terminal stays in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms a target cell.

[0045] The second judgment module is used to judge whether it currently has handover parameter information according to the handover parameter information request.

[0046] A third sending module, configured to send handover parameter information to a service terminal guard module when it is determined that there is handover parameter information currently; the service terminal guard module can, according to the handover parameter information received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

[0047] 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, the service base station node and the service terminal node are communicatively connected, the service base station node includes a service base station and a service base station guard module, the service terminal node includes a service terminal and a service terminal guard module, the service terminal guard module includes the cell handover control device of the communication system described above, the service base station guard module includes the cell handover control device of the communication system described above, 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 guard module and the service terminal guard module can form a guard network.

[0048] The cell handover control method of the communication system provided by the present invention, by receiving the working frequency indication instruction message sent by the service base station guard module in real time, and when determining the target cell that the current service terminal needs to hand over to, if there is handover parameter information itself, it can directly lock the radio interface frequency of the target cell, that is, directly perform the cell handover. Even if there is no handover parameter information of the target cell, it can request the service base station guard module to obtain the handover parameter information. Since the service base station guard module can directly store the handover parameter information itself, the handover parameter information can be directly obtained through the service base station guard module, saving the time for the service terminal to obtain the target cell information by receiving the system message of the target cell, thereby accelerating the handover process, reducing the service interruption time during cell handover, ensuring the service continuity during the service terminal handover process, and at the same time, the handover process does not change the protocol process between the service base station and the service terminal. Description of the Drawings

[0049] 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.

[0050] Figure 1 It is a structural block diagram of the communication system provided by the present invention.

[0051] Figure 2 It is a structural block diagram of the service terminal node provided by the present invention.

[0052] Figure 3Block diagram of the cell handover control device for the first communication system provided by the present invention.

[0053] Figure 4 Flowchart of the cell handover control method for the communication system provided by the present invention.

[0054] Figure 5 Flowchart of determining the arrival equivalent path loss provided by the present invention.

[0055] Figure 6 Flowchart of determining the target cell of the current service terminal provided by the present invention.

[0056] Figure 7 Block diagram of the service base station node provided by the present invention.

[0057] Figure 8 Block diagram of the cell handover control device for the second communication system provided by the present invention.

[0058] Figure 9 Another implementation flowchart of the cell handover control method for the communication system provided by the present invention.

[0059] Figure 10 Block diagram of the handover between the service base station node and the service terminal node provided by the present invention.

[0060] Figure 11 Schematic diagram of the handover process of the cell handover control method for the communication system provided by the present invention. Detailed implementation

[0061] 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 conjunction with the embodiments.

[0062] 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] It should be noted that the terms "first", "second", etc. in the description, claims and the 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 the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes 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.

[0064] Currently, under the 3GPP standard system, the working frequency point of a cell (deployed on a base station) is a crucial system parameter and will be periodically sent in the air interface system message. Once a cell is established, the working frequency point generally does not change unless cell reconfiguration is performed, which involves a complex base station configuration management process and usually has a relatively large time delay, generally in the order of minutes. Therefore, when a terminal accesses a cell, it is difficult to ensure service continuity during rapid frequency switching of the cell under the 3GPP protocol system. When the cellular network formed based on this terminal is applied in special fields such as commercial communications, the anti-interference ability is further affected due to the difficulty in ensuring the continuity of frequency switching.

[0065] Based on this, in an embodiment 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. 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.

[0066] 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.

[0067] 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.

[0068] In addition, the service network is mainly a wireless communication network composed of service base stations and service terminals for service bearing, such as 4G cellular networks, 5G cellular networks, etc.; the escort network is mainly composed of a service base station escort module and a service terminal escort module, mainly used to provide coordinated frequency switching for service base stations or service terminals to avoid interference.

[0069] It should be understood that in the embodiments of the present invention, the service terminal deploys a service terminal escort module to construct an escort network with the service base station escort module deployed on the service base station. The service terminal escort module receives a network coordinated frequency switching instruction from the service base station escort module, and this instruction notifies the occurrence time and target frequency point of the frequency change of the service terminal node. The service terminal escort module assists the service terminal in directly switching its actual working frequency 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, bypassing the standard 3GPP protocol processing process (that is, the frequency switching process keeps the working parameters and protocol process of the communication system unchanged). Through this strategy, the cellular network can perceive the air interface spectrum situation in real time and avoid interference.

[0070] It should be noted that when the service terminal does not deploy a terminal escort module, the frequency of the service terminal needs to be determined and switched through the standard 3GPP protocol. However, due to the problem of poor anti-interference ability of the 3GPP protocol itself, in the communication system provided by the present invention, by deploying a service terminal escort module on the service terminal and a service base station escort module on the service base station, the service terminal escort module and the service base station escort module can assist the service base station and the service terminal in synchronously changing the working frequency to achieve network coordinated frequency change. At the same time, the service terminal escort module deployed on the service terminal side interacts with different service base station escort modules and assists the service terminal in selecting the best cell for handover based on communication measurement results, and can also obtain the handover parameter information of the target cell in advance, so as to ensure that the entire communication network can achieve fast handover when the terminal device moves at the cell edge under the premise of having strong anti-interference ability, and avoid service interruption when the terminal device performs cell handover.

[0071] 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 terminal escort module 220 communicatively connected to the service terminal 210. The service terminal escort module 220 includes a cell handover control device 300 of the first communication system applied to the service terminal node described below.

[0072] In an embodiment of the present invention, the service terminal node 200 includes a service terminal protection module. The service terminal protection module and the service base station protection module included in the service base station node can construct a protection network independent of the service network to implement a transmission channel for instructions related to frequency coordination control between the service base station and the service terminal. At the same time, both the service base station protection module and the service terminal protection module can provide an auxiliary frequency switching function for the service base station and the service terminal, supporting synchronous switching of the air interface frequencies of the service base station node and the service terminal node.

[0073] As Figure 2 shown, taking the structural block diagram of the service terminal protection 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.

[0074] Among them, the communication unit 222 interacts with other protection modules to construct a protection network, establishes an interaction channel between the protection modules, and maintains a network-level time synchronization relationship between the protection modules. The communication unit provides a bearer service externally through a service interface, assists in expanding the coverage of the service network, and at the same time, when the service network is interrupted, it can also provide a fallback communication service.

[0075] 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 in performing two-way switching of the operating frequency to 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.

[0076] The spectrum sensing unit 224 is used to sense and monitor the air interface spectrum situation under the control of the intelligent control unit;

[0077] The clock unit 225 can support providing a synchronous timing service for external devices through a timing interface; at the same time, the clock unit also provides a clock service for other units of the protection module. When an external synchronous signal is input, the clock unit can adjust the local clock based on the external synchronous signal; when no external synchronous signal is input, the clock unit can adjust the local clock according to the output of the communication unit.

[0078] The intelligent control unit 221 obtains the air interface spectrum situation of its own module through the spectrum sensing unit, shares and exchanges the spectrum situations of each other with other modules through the communication unit, forms a collaborative frequency usage strategy, and generates specific air interface frequency change moments and specific frequency point numbers to be used based on this frequency usage strategy, and diffuses them to the intelligent control units of other modules through the communication unit to collaboratively control the auxiliary frequency switching unit to synchronously switch frequencies, realizing real-time changes in the air interface frequencies of the service network and avoiding interference; the intelligent control unit can also perform collaborative control on the analog base station and the terminal through a control interface.

[0079] The service air interface is specifically represented as the input / output interface of the service network's air interface frequency, i.e., the actual air interface of the service network; the escort air interface is specifically represented as the air interface of the escort network, which is multiplexed by the communication unit and the spectrum sensing unit.

[0080] In addition, in the embodiment of the present invention, the intelligent control unit 221 further includes a cell handover control device 300 of the first communication system. Through the cell handover control device 300 of the first communication system, fast handover of the service terminal node between different cells can be realized, ensuring service continuity during the handover process of the service terminal. At the same time, the protocol process between the service base station and the service terminal does not change during this handover process.

[0081] Specifically, in the embodiment of the present invention, as Figure 3 shown, the cell handover control device 300 of the first communication system includes:

[0082] A first receiving module 310, configured to receive in real time a working frequency indication instruction message sent by at least one service base station escort module. Here, the current service terminal resides in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms a target cell;

[0083] A first judgment module 320, configured to judge whether there is switching parameter information of the target cell when it has been determined that the target cell to which the current service terminal needs to hand over;

[0084] A first sending module 330, configured to, if there is no switching parameter information of the target cell, send a switching parameter information request to the service base station escort module corresponding to the target cell. The service base station escort module can determine whether it currently has switching parameter information according to the switching parameter information request, and can return the switching parameter information when there is switching parameter information;

[0085] A handover module 340, configured to, if there is switching parameter information of the target cell, or receive the switching parameter information returned by the service base station escort module within a preset time, send the switching parameter information of the target cell to the service terminal and then lock the air interface frequency of the current service terminal node to the air interface frequency corresponding to the target cell to complete the handover of the current service terminal from the source cell to the target cell.

[0086] In an embodiment of the present invention, by receiving in real time a working frequency indication instruction message sent by a service base station guard module, and when determining the target cell to which the current service terminal needs to switch, if there is switching parameter information itself, the air interface frequency of the target cell can be directly locked, that is, the cell can be directly switched. Even if there is no switching parameter information of the target cell, the service base station guard module can be requested to obtain the switching parameter information. Since the service base station guard module can directly store the switching parameter information itself, the switching parameter information can be directly obtained through the service base station guard module, saving the time for the service terminal to obtain the target cell information by receiving the system message of the target cell, thereby accelerating the handover process, reducing the service interruption time during cell handover, ensuring service continuity during the handover process of the service terminal, and at the same time, the protocol process between the service base station and the service terminal remains unchanged during this handover process.

[0087] Therefore, the service terminal node provided by the present invention, by setting a service terminal guard module, and a cell handover control device of the communication system is set in the service terminal guard module, can receive a working frequency indication instruction message from the service base station guard module through the guard network. Through the control interface provided by the service base station and the service terminal, the service base station guard module can save the switching parameter information locally in the guard module in advance. When the service base station guard module assists in initiating a cell handover, the switching parameter information is sent to the service terminal in advance, saving the time for the service terminal to obtain the target cell information by receiving the target cell system message, thereby accelerating the handover process, reducing the service interruption time during cell handover, realizing fast handover of the service terminal node between different cells, ensuring service continuity during the handover process of the service terminal, and at the same time, the protocol process between the service base station and the service terminal remains unchanged during this handover process.

[0088] As another embodiment of the present invention, a cell handover control method for a communication system is provided. 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 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; as Figure 4 shown, the cell handover control method of the communication system includes:

[0089] S100. Receive in real time at least one working frequency indication instruction message sent by a service base station guard module. Among them, the current service terminal resides in a source cell deployed by a first service base station, and at least one working cell adjacent to the source cell forms a target cell;

[0090] In an embodiment of the present invention, after the service base station node is started, the service base station guard module periodically diffuses externally the working frequency indication instruction currently being used by itself, and forms a working frequency indication instruction message that is received by the service terminal guard module. The working cell deployed on the first service base station where the current service terminal resides is the source cell. At least one working cell adjacent to the source cell forms the target cell.

[0091] It should be noted that in an embodiment of the present invention, both the source cell and the target cell may be deployed on the first service base station, or the source cell may be deployed on the first service base station and the target cell may be deployed on the second service base station.

[0092] In an embodiment of the present invention, the working frequency indication instruction message at least includes parameters such as message sequence number, service base station ID, working cell ID, cell working frequency (corresponding to the working frequency configured by the service base station), cell air interface frequency (corresponding to the air interface frequency of the service base station node), cell transmit power, and transmit power of the service base station guard module.

[0093] S200. When it has been determined the target cell to which the current service terminal needs to handover, determine whether there is handover parameter information of the target cell;

[0094] In an embodiment of the present invention, the handover parameter information may specifically include cell parameters and system messages. The cell parameters may specifically include physical cell ID, working frequency, transmit power, access channel location, system message scheduling result, subcarrier spacing, uplink and downlink configuration (TDD mode), control channel configuration, etc.; the system messages may specifically include SIB1, SIB2, etc.

[0095] It should be understood that generally, after the service base station starts normal operation of the cell, or when the cell parameters or system messages change, the service base station actively sends the cell parameters and system messages to the service base station guard module, and the service base station guard module stores them locally. And the service base station guard module and the current service terminal guard module can transmit the handover parameter information through the guard network.

[0096] When the service terminal guard module has determined the target cell to which the current service terminal needs to handover, first determine whether it has the handover parameter information. If not, it may send a handover parameter information request to the service base station guard module to obtain the handover parameter information from the service base station guard module.

[0097] S300. If there is no handover parameter information of the target cell, send a handover parameter information request to the service base station guard module corresponding to the target cell, where the service base station guard module can determine whether it currently has handover parameter information according to the handover parameter information request, and can return the handover parameter information when there is handover parameter information;

[0098] It should be understood that when the service terminal guard module does not have handover parameter information itself, it requests the handover parameter information from the service base station guard module of the determined target cell. Since the service base station guard module can store the handover parameter information locally in advance, it can directly feedback the handover parameter information to the service terminal guard module, so as to quickly realize the cell handover of the service terminal.

[0099] S400. If there is handover parameter information of the target cell, or if the handover parameter information returned by the service base station guard module is received within a preset time, send the handover parameter information of the target cell to the service terminal, and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

[0100] It should be understood that if the service terminal guard module itself has handover parameter information of the target cell, or even if it does not have it and receives the handover parameter information feedback by the service base station guard module within a preset time, the radio interface frequency of the target cell can be locked to realize the handover of the service terminal from the source cell to the target cell.

[0101] Therefore, for the cell handover control method of the communication system provided by the present invention, by receiving the working frequency indication command message sent by the service base station guard module in real time, and when determining the target cell that the current service terminal needs to hand over, if it has handover parameter information itself, it can directly lock the radio interface frequency of the target cell, that is, directly perform the cell handover. Even if there is no handover parameter information of the target cell, it can request the service base station guard module to obtain the handover parameter information. Since the service base station guard module can store the handover parameter information directly by itself, the handover parameter information can be directly obtained through the service base station guard module, saving the time for the service terminal to obtain the target cell information by receiving the system message of the target cell, thus accelerating the handover process, reducing the service interruption time during cell handover, ensuring the service continuity during the service terminal handover process, and at the same time, the handover process does not change the protocol process between the service base station and the service terminal.

[0102] Specifically, when the service terminal guard module does not have handover parameter information itself, the cell handover control method of the communication system further includes:

[0103] If there is no handover parameter information of the target cell and the handover parameter information returned by the service base station guard module has not been received within the preset time, the radio frequency of the current service terminal node is locked to the radio frequency corresponding to the target cell, and the system message of the target cell is obtained through the passive reception method of the service terminal radio interface, so as to complete the handover of the current service terminal from the source cell to the target cell.

[0104] It should be understood that when the service terminal guard module itself does not have handover parameter information, it can send a request to the service base station guard module to obtain the handover parameter information; in order to shorten the cell handover time of the service terminal, it is necessary to receive the handover parameter information feedback by the service base station guard module within the preset time. If the handover parameter information feedback by the service base station guard module is not received within the preset time, the action of locking the radio frequency of the target cell is directly performed, and then the service terminal guard module can obtain the system message of the target cell through the passive reception method of the service terminal radio interface, so as to realize the cell handover of the service terminal and reduce the service interruption time during cell handover.

[0105] Specifically, in the embodiment of the present invention, the service terminal guard module can determine whether the handover parameter information can be received within the preset time by setting a timer. That is, a handover timer is started while sending a handover parameter information request to the service base station guard module. If the handover parameter information feedback by the service base station guard module is not received when the handover timer times out, the action of locking the radio frequency of the target cell is executed.

[0106] In the embodiment of the present invention, the cell handover control method of the communication system further includes the following steps before the step of determining the target cell to which the current service terminal needs to hand over:

[0107] S500. Determine whether the operating frequency indication command message received by the current service terminal is sent by the source cell;

[0108] It should be understood that after the service terminal guard module receives the operating frequency indication command message, it can be transmitted to the service terminal, and determine whether the operating frequency indication command message received by the service terminal is sent by the source cell where it is deployed, that is, whether it is sent by the service base station guard module of the source cell where it is deployed.

[0109] S600. If not, determine the arrival equivalent path loss of the service base station corresponding to the operating frequency indication command message;

[0110] In an embodiment of the present invention, when the service terminal guard module determines that the working frequency indication instruction message is not sent by the source cell, the equivalent path loss of the service base station corresponding to the service base station guard module that sends the working frequency indication instruction message to reach the current service terminal is determined according to the working frequency indication instruction message.

[0111] It should be understood here that if the working frequency indication instruction message received by the service terminal guard module is sent by the service base station guard module in the source cell, no cell handover is performed, that is, no subsequent handover process is performed.

[0112] S700. Determine the target cell of the current service terminal according to the equivalent path loss of arrival.

[0113] Determine the target cell that can be used as the current service terminal according to the calculated equivalent path loss of arrival of the service base station to the current service terminal.

[0114] After determining the target cell of the current service terminal, lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell to complete the cell handover of the service terminal.

[0115] Further specifically, determine the equivalent path loss of arrival of the service base station corresponding to the working frequency indication instruction message, as Figure 5 shown, including:

[0116] S610. Calculate the normalized path loss of arrival of the service base station guard module according to the transmission power of the service base station guard module in the working frequency indication instruction message, the guard radio interface received power of the current service terminal guard module, and the guard radio interface received frequency. The calculation formula is:

[0117] PLn = transmission power of the service base station guard module - guard radio interface received power of the service terminal guard module - 20lgFs + Δ1,

[0118] where PLn represents the normalized path loss of arrival of the service base station guard module, Fs represents the guard radio interface received frequency of the current service terminal guard module, and Δ1 represents the first correction factor;

[0119] S620. Calculate the equivalent path loss of arrival of the service base station according to the normalized path loss of arrival of the service base station guard module and the radio interface frequency of the cell where the corresponding service base station is deployed. The calculation formula is:

[0120] Ple = PLn + 20lgFd + Δ2,

[0121] where Ple represents the equivalent path loss of arrival of the service base station, Fd represents the radio interface frequency of the cell where the service base station is deployed, and Δ2 represents the second correction factor.

[0122] It should be noted that in the embodiments of the present invention, the first correction factor and the second correction factor can specifically be regarded as empirical values related to frequency, topography, weather, antennas, etc.

[0123] In the embodiments of the present invention, the target cell of the current service terminal is determined according to the arrival equivalent path loss information, as Figure 6 shown, including:

[0124] S710. Determine whether the arrival equivalent path loss corresponding to the serving base station where the current source cell is located is greater than a first preset threshold;

[0125] S720. If the arrival equivalent path loss corresponding to the serving base station where the current source cell is located is greater than the first preset threshold, and the arrival equivalent path loss of the serving base station where the currently received working cell is located is less than a preset target value, then determine that the working cell is the target cell of the current service terminal;

[0126] In the embodiments of the present invention, the arrival equivalent path loss of the serving base station where the currently received working cell is located is less than the preset target value, including:

[0127] The current arrival equivalent path loss of the serving base station where the currently received working cell is located is less than a second preset threshold, and among the consecutive N arrival equivalent path losses of the serving base station where the currently received working cell is located, M times are less than the second preset threshold. Both M and N are natural numbers greater than or equal to 1, and N is greater than or equal to M.

[0128] It should be understood that in the embodiments of the present invention, for the current arrival equivalent path loss of the serving base station corresponding to the currently received working cell being less than the second preset threshold, it is also necessary to determine whether among the consecutive N arrival equivalent path losses, M times are less than the second preset threshold, where both M and N are natural numbers greater than or equal to 1, and N is greater than or equal to M. For example, among the consecutive 12 arrival equivalent path losses, 10 times are less than the second preset threshold.

[0129] S730. If the arrival equivalent path loss corresponding to the serving base station where the current source cell is located is not greater than the first preset threshold, then no action is taken.

[0130] In the embodiments of the present invention, the cell handover method of the communication system further includes:

[0131] The arrival equivalent path loss is stored and updated in real time according to the serving base station index information, and the serving base station index information at least includes serving base station ID information and corresponding working cell ID information.

[0132] It should be understood that the service base station index information can be specifically determined according to the service base station ID and the working cell ID information in the received working frequency indication instruction message. That is, whenever a working frequency indication instruction message is received, the service base station ID and the corresponding working cell ID in the working frequency indication instruction message are recorded once. And each time a working frequency indication instruction message is received, the arrival equivalent path loss from the service base station corresponding to the service base station guard module that issues the working frequency indication instruction message to the current service terminal is also calculated once, and the latest calculated arrival equivalent path loss is updated and stored based on the corresponding service base station ID and working cell ID.

[0133] The following details the specific implementation process of the cell handover control method for the communication system of the present invention.

[0134] It should be noted that in the embodiments of the present invention, the communication coverage of the service base station guard module corresponding to the source cell is roughly equivalent to that of the source cell, the communication coverage of the service base station guard module corresponding to the target cell is roughly equivalent to that of the target cell, and the guard modules are interconnected through the guard network.

[0135] 1) After each service base station starts normal operation of the cell or when the cell parameters or system messages change, it sends its own deployed cell parameters (including but not limited to: physical cell ID, working frequency, transmit power, access channel location, system message scheduling result, subcarrier spacing, uplink and downlink configuration (TDD mode), control channel configuration, etc.) and system messages to its corresponding service base station guard module (the service base station guard module can also actively request handover parameter information (i.e., cell parameters and system messages) from the corresponding service base station. If the corresponding cell on the service base station is operating normally, it responds to the request message (sending its own deployed handover parameter information); otherwise, it discards the request or responds to the request with failure).

[0136] 2) The service base station guard module periodically spreads the working frequency indication instruction message it is currently actually using through the guard network. The instruction message at least includes parameters such as message sequence number, service base station ID, working cell ID, cell working frequency, cell air interface frequency, cell transmit power, and service base station guard module transmit power.

[0137] 3) After the service terminal guard module receives the working frequency indication instruction message, it updates the measurement results of the cell saved locally using the service base station ID + working cell ID as the index;

[0138] 4) The service terminal guard module makes a handover decision. If a handover is required (the measurement result corresponding to the source cell is lower than the threshold, and the measurement result corresponding to the target cell minus the measurement result corresponding to the source cell is better than the threshold), then:

[0139] a. If the service terminal guard module does not have handover parameter information, send a handover parameter information request to the service base station guard module corresponding to the target cell, and start a handover timer at the same time; otherwise, proceed to 5).

[0140] b. If the service base station guard module does not have handover parameter information, send a handover parameter information request to the service base station corresponding to the target cell; otherwise, directly send the handover parameter information of the target cell to the service terminal guard module.

[0141] c. After receiving the handover parameter information request, the service base station sends the handover parameter information of the target cell to the corresponding service base station guard module.

[0142] d. After receiving the handover parameter information request, the service base station guard module sends the handover parameter information of the target cell to the corresponding service terminal guard module.

[0143] e. If the handover timer expires, proceed to 5).

[0144] 5) The radio frequency of the air interface of the service terminal node is locked to the radio frequency of the air interface corresponding to the target cell.

[0145] 6) If the service terminal guard module has obtained the handover parameter information of the target cell, forward the content to the service terminal to accelerate the access speed of the service terminal in the target cell (since the service terminal obtains in advance the information required for accessing the target cell and does not need to wait to receive the system message of the target cell, the terminal access speed will be greatly improved).

[0146] As another embodiment of the present invention, a service base station node 100 is provided, as Figure 7 shown, which includes a service base station 110 and a service base station guard module 120 communicatively connected to the service base station 110. The service base station guard module 120 includes a cell handover control device 400 of the second communication system applied to the service base station node described below.

[0147] In the embodiment of the present invention, the service base station node 100 includes a service base station guard module. The service base station guard module and the service terminal guard module included in the service terminal node can construct a guard network independent of the service network to realize a transmission channel for frequency coordination control related instructions between the service base station and the service terminal; at the same time, both the service base station guard module and the service terminal guard module can provide an auxiliary frequency handover function for the service base station and the service terminal, and support synchronous handover of the radio frequencies of the air interfaces of the service base station node and the service terminal node.

[0148] In the embodiment of the present invention, for the specific function implementation of the service base station guard module of the service base station node, reference can be made to the description of the service terminal guard module above, and details will not be repeated here.

[0149] It should be noted that, in the embodiments of the present invention, the intelligent control unit of the service base station escort module further includes a cell handover control device 400 of a second communication system. Through the cell handover control device 400 of the second communication system, rapid handover of service terminal nodes between different cells can be realized, ensuring service continuity during the handover process of service terminals. At the same time, the protocol process between the service base station and the service terminal remains unchanged during this handover process.

[0150] Specifically, in the embodiments of the present invention, as Figure 8 shown, the cell handover control device 400 of the second communication system includes:

[0151] A second sending module 410, configured to periodically send an instruction message of its own current operating frequency through the escort network;

[0152] A second receiving module 420, configured to receive a handover parameter information request from the service terminal escort module when the current service terminal resident in the source cell has determined the target cell to be handed over and there is no handover parameter information of the target cell in the service terminal escort module of the current service terminal resident in the source cell; wherein, the current service terminal resides in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms the target cell;

[0153] A second judgment module 430, configured to judge whether there is handover parameter information currently according to the handover parameter information request;

[0154] A third sending module 440, configured to send the handover parameter information to the service terminal escort module when it is determined that there is handover parameter information currently; the service terminal escort module can, according to the handover parameter information received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell to complete the handover of the current service terminal from the source cell to the target cell.

[0155] In an embodiment of the present invention, by receiving in real time the working frequency indication instruction message sent by the service base station guard module, and when determining the target cell to which the current service terminal needs to switch, if there is switching parameter information itself, the air interface frequency of the target cell can be directly locked, that is, the cell can be directly switched. Even if there is no switching parameter information of the target cell, the service terminal can request the service base station guard module to obtain the switching parameter information. Since the service base station guard module can directly store the switching parameter information itself, the switching parameter information can be directly obtained through the service base station guard module, saving the time for the service terminal to obtain the target cell information by receiving the system message of the target cell, thereby accelerating the switching process, reducing the service interruption time during cell switching, ensuring the service continuity during the switching process of the service terminal, and at the same time, the protocol process between the service base station and the service terminal is not changed during this switching process.

[0156] Therefore, the service terminal node provided by the present invention, by setting the service terminal guard module, and setting the cell switching control device of the communication system in the service terminal guard module, can receive the working frequency indication instruction message from the service base station guard module through the guard network. Through the control interface provided by the service base station and the service terminal, the service base station guard module can save the switching parameter information locally in the guard module in advance. When the service base station guard module assists in initiating cell switching, the switching parameter information is sent to the service terminal in advance, saving the time for the service terminal to obtain the target cell information by receiving the target cell system message, thereby accelerating the switching process, reducing the service interruption time during cell switching, realizing the fast switching of the service terminal node between different cells, ensuring the service continuity during the switching process of the service terminal, and at the same time, the protocol process between the service base station and the service terminal is not changed during this switching process.

[0157] As another embodiment of the present invention, a cell switching control method for a communication system is provided, 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 guard module can be communicatively connected to the service terminal guard module in the service terminal node to form a guard network, and the service base station can be communicatively connected to the service terminal in the service terminal node to form a service network; as Figure 9 shown, the cell switching control method of the communication system includes:

[0158] S910. Periodically send the current working frequency indication instruction message of itself through the guard network;

[0159] In an embodiment of the present invention, the service base station guard module can periodically send out an instruction message indicating its current operating frequency. In an embodiment of the present invention, the instruction message indicating the operating frequency at least includes: message sequence number, service base station ID, working cell ID, cell operating frequency (corresponding to the operating frequency configured for the service base station), cell air interface frequency (corresponding to the air interface frequency of the service base station node), cell transmit power, and the transmit power of the service base station guard module, and other parameters.

[0160] S920. When the current service terminal staying in the source cell has determined the target cell to be switched to and the service terminal guard module of the current service terminal staying in the source cell does not have the handover parameter information of the target cell, receive the handover parameter information request from the service terminal guard module; wherein, the current service terminal stays in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms the target cell;

[0161] In an embodiment of the present invention, the handover parameter information may specifically include cell parameters and system messages. The cell parameters may specifically include physical cell ID, operating frequency, transmit power, access channel location, system message scheduling result, subcarrier spacing, uplink and downlink configuration (TDD mode), control channel configuration, etc.; the system messages may specifically include SIB1, SIB2, etc.

[0162] S930. Judge whether there is handover parameter information currently according to the handover parameter information request;

[0163] In an embodiment of the present invention, when the service base station guard module receives the handover parameter information request, it first judges whether it has the handover parameter information. If it exists, it directly feeds back the handover parameter information to the service terminal guard module.

[0164] S940. When it is determined that there is handover parameter information currently, send the handover parameter information to the service terminal guard module; the service terminal guard module can, according to the handover parameter information received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the air interface frequency of the current service terminal node to the air interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

[0165] Further, the cell handover control method of the communication system further includes:

[0166] If it is determined that there is no handover parameter information currently, send a handover parameter information request to the service base station, and the service base station can return the handover parameter information according to the handover parameter information request;

[0167] Receive the handover parameter information returned by the service base station and send the handover parameter information to the service terminal guard module.

[0168] It should be understood that if the service base station guard module itself does not have handover parameter information, a handover parameter information request is sent to the service base station, and the handover parameter information fed back by the service base station to itself is sent to the service terminal guard module.

[0169] The cell handover control method of the communication system provided by the present invention receives a working frequency indication instruction message sent by the service base station guard module in real time. When determining the target cell to which the current service terminal needs to hand over, if there is handover parameter information itself, the air interface frequency of the target cell can be directly locked, that is, the cell can be directly handed over. Even if there is no handover parameter information of the target cell, a request can be sent to the service base station guard module to obtain the handover parameter information. Since the service base station guard module can directly store the handover parameter information itself, the handover parameter information can be directly obtained through the service base station guard module, saving the time for the service terminal to obtain the target cell information by receiving the system message of the target cell, thereby accelerating the handover process, reducing the service interruption time during cell handover, ensuring service continuity during the handover process of the service terminal, and at the same time, the protocol process of the service base station and the service terminal is not changed during the handover process.

[0170] Combined with Figure 10 and Figure 11 The specific implementation process of the cell handover control method of the communication system provided by the present invention is described in detail.

[0171] As Figure 10 shown, a cell (source cell) is deployed on service base station 1, and a cell (target cell) is deployed on service base station 2. Service terminal node 3 is simultaneously located in the coverage areas of the source cell and the target cell, at the coverage edge of the two cells. Assume that the current service terminal 3 has camped on the source cell and the source cell provides service bearer. The working frequency of the source cell is F1, and the air interface frequency is F1'; the working frequency of the target cell is F2, and the air interface frequency is F2'. When F1'≠F2', the service terminal cannot receive the service information of the target cell; the service terminal node is moving towards the coverage area of the target cell.

[0172] In the embodiment of the present invention, F1 and F2 can be the same or different, and F1' and F2' can be the same or different. It should be noted here that if F1 and F2 are the same and F1' and F2 are also the same, then there is no need to perform handover through this handover method of the present invention, and handover can be directly performed.

[0173] In the embodiment of the present invention, the communication coverage of the service base station 1 guard module is roughly equivalent to that of the source cell, and the communication coverage of the service base station 2 guard module is roughly equivalent to that of the target cell. The guard modules are interconnected through a guard network.

[0174] Specifically, in combination with Figure 11 As shown, (1) After the cell of Service Base Station 1 works normally or when the cell parameters or system messages change, it sends its own deployed cell parameters (including but not limited to: physical cell ID, operating frequency (F1), transmit power, access channel location, system message scheduling result, subcarrier spacing, uplink / downlink configuration (TDD mode), control channel configuration, etc.) and system messages (including but not limited to SIB1, SIB2) to the protection module of Service Base Station 1.

[0175] (2) After the cell of Service Base Station 2 works normally or when the cell parameters or system messages change, it sends its own deployed cell parameters (including but not limited to: physical cell ID, operating frequency (F1), transmit power, access channel location, system message scheduling result, subcarrier spacing, uplink / downlink configuration (TDD mode), control channel configuration, etc.) or system messages (including but not limited to SIB1, SIB2) to the protection module of Service Base Station 2.

[0176] (3) The protection module of Service Base Station 1 periodically diffuses the working frequency indication instruction currently in actual use externally through the protection network. This instruction at least includes: message sequence number, service base station ID, working cell ID, cell operating frequency (F1), cell air interface frequency (F1’), cell transmit power, transmit power of the service base station protection module, and other parameters.

[0177] (4) The protection module of Service Base Station 2 periodically diffuses the working frequency indication instruction currently in actual use externally through the protection network. This instruction at least includes: message sequence number, service base station ID, working cell ID, cell operating frequency (F2), cell air interface frequency (F2’), cell transmit power, transmit power of the service base station protection module, and other parameters.

[0178] (5) After the protection module of Service Terminal 3 receives the "working frequency indication instruction", it measures and calculates the normalized path loss PLn and the equivalent path loss Ple:

[0179] PLn = transmit power of the service terminal base station protection module (dBm) - receive power of the service terminal protection module's protection air interface (dBm) - 20lgFs + Δ1;

[0180] Where: Fs represents the receive frequency of the service terminal protection module's protection air interface currently; Δ1 represents the first correction factor;

[0181] PLe = PLn + 20lgFd + Δ2;

[0182] Where: Fd represents the air interface frequency of the cell deployed by the service base station; Δ2 represents the second correction factor.

[0183] (6) The service terminal guard module uses the service base station ID + working cell ID as an index to update the Ple of this cell saved locally.

[0184] (7) The service terminal 3 guard module makes a handover decision. Assuming a handover is required, then:

[0185] a. If the service terminal 3 guard module does not have the handover parameter information of the target cell (i.e., cell parameters and system messages), it sends a handover parameter information request to the service base station 2 guard module and starts a handover timer at the same time; otherwise, it proceeds to (8);

[0186] b. If the service base station 2 guard module does not have the handover parameter information of the target cell, it sends a handover parameter information request to the service base station 2; otherwise, it directly sends the handover parameter information of the target cell to the service terminal 3 guard module;

[0187] c. After receiving the handover parameter information request, the service base station 2 sends the handover parameter information of the target cell to the service base station 2 guard module;

[0188] d. After receiving the handover parameter information request, the service base station 2 guard module sends the handover parameter information of the target cell to the service terminal 3 guard module;

[0189] e. If the handover timer times out, it proceeds to (8).

[0190] (8) The radio frequency of the service terminal 3 node is locked to the radio frequency F2' corresponding to the target cell;

[0191] (9) If the service terminal 3 guard module has obtained the cell parameters and system messages of the target cell, it forwards this content to the service terminal 3 to accelerate the access speed of the service terminal in the target cell.

[0192] (10) Because the service terminal 3 obtains in advance the information required for accessing the target cell, it directly switches the working frequency to the working frequency of the target cell and does not need to wait to receive the system message of the target cell anymore. Therefore, the terminal access speed will be greatly improved.

[0193] It should be noted that in the embodiments of the present invention, if different service base stations use the same frequency networking, the handover speed will be further improved. That is, if F1 = F2, that is, the service base stations use the same frequency networking, and the service base station guard modules independently control the radio frequencies of the service base station nodes based on reasons such as spectrum situation, the above cell handover process will be accelerated. Because after the service terminal node 3 guard module switches the radio frequency from F1' to F2', the working frequency of the service terminal 3 does not change, and it can immediately receive the system message of the target cell. Therefore, the handover process between cells is accelerated.

[0194] It should be understood that when multiple cells are deployed on a service base station, each cell can correspond to the deployment of an independent service base station guard module, and the cell coverage is roughly equivalent to the communication coverage of the service base station guard module. In this case, the handover process is the same as that described above.

[0195] In summary, for the problem of long cell handover time and easy service interruption existing in the current co-frequency change network, the cell handover control method of the communication system provided by the present invention measures the communication quality of different service base station guard modules through the service guard module, assists the service terminal to initiate the handover process, realizes the fast handover of the service terminal node between different cells, ensures the service continuity during the handover process of the service terminal, and at the same time, the handover process does not change the protocol process of the service base station and the service terminal.

[0196] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, but 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 cell handover control method for a communication system, 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 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 cell handover control method of the communication system includes: Receiving in real time a working frequency indication instruction message sent by at least one service base station guard module. Here, the current service terminal resides in a source cell deployed by a first service base station, and at least one working cell adjacent to the source cell forms a target cell; When it has been determined which target cell the current service terminal needs to hand over to, determine whether there is handover parameter information for the target cell; If there is no handover parameter information for the target cell, send a handover parameter information request to the service base station guard module corresponding to the target cell. Here, the service base station guard module can determine whether it currently has handover parameter information according to the handover parameter information request, and can return the handover parameter information when there is handover parameter information; If there is handover parameter information for the target cell, or if the handover parameter information returned by the service base station guard module is received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell to complete the handover of the current service terminal from the source cell to the target cell.

2. The cell handover control method of the communication system according to claim 1, characterized in that, The cell handover control method of the communication system further includes: If there is no handover parameter information for the target cell and the handover parameter information returned by the service base station guard module has not been received within a preset time, lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, and obtain the system message of the target cell through the passive radio interface reception method of the service terminal to complete the handover of the current service terminal from the source cell to the target cell.

3. The cell handover control method of the communication system according to claim 1 or 2, characterized in that The cell handover control method of the communication system further includes the steps performed before the step when it has been determined which target cell the current service terminal needs to hand over to: Determine whether the working frequency indication instruction message received by the current service terminal is sent by the source cell; If not, determine the arrival equivalent path loss of the service base station corresponding to the working frequency indication instruction message; Determine the target cell of the current service terminal according to the arrival equivalent path loss; 4. The cell handover control method of the communication system according to claim 3, characterized in that, Determining the arrival equivalent path loss of the service base station corresponding to the working frequency indication instruction message includes: Calculating the arrival normalized path loss of the service base station guard module according to the transmission power of the service base station guard module, the guard radio interface reception power of the current service terminal guard module, and the guard radio interface reception frequency in the working frequency indication instruction message. The calculation formula is: PLn = transmission power of the service base station guard module - guard radio interface reception power of the service terminal guard module - 20lgFs + Δ1, Wherein, PLn represents the arrival normalized path loss of the service base station guard module, Fs represents the guard air interface receiving frequency of the current service terminal guard module, and Δ1 represents the first correction factor; Calculate the arrival equivalent path loss of the service base station according to the arrival normalized path loss of the service base station guard module and the air interface frequency of the corresponding service base station deployed cell. The calculation formula is: Ple = PLn + 20lgFd + Δ2, Wherein, Ple represents the arrival equivalent path loss of the service base station, Fd represents the air interface frequency of the service base station deployed cell, and Δ2 represents the second correction factor.

5. The cell handover control method of the communication system according to claim 3, characterized in that Determine the target cell of the current service terminal according to the arrival equivalent path loss information, including: Judge whether the arrival equivalent path loss corresponding to the service base station where the current source cell is located is greater than the first preset threshold; If the arrival equivalent path loss corresponding to the service base station where the current source cell is located is greater than the first preset threshold, and the arrival equivalent path loss of the service base station where the currently received working cell is located is less than the preset target value, then determine that this working cell is the target cell of the current service terminal; If the arrival equivalent path loss corresponding to the service base station where the current source cell is located is not greater than the first preset threshold, then no action is taken; Wherein, the arrival equivalent path loss of the service base station where the currently received working cell is located is less than the preset target value, including: The current arrival equivalent path loss of the service base station where the currently received working cell is located is less than the second preset threshold, and among the consecutive N arrival equivalent path losses of the service base station where the currently received working cell is located, M times are less than the second preset threshold. Both M and N are natural numbers greater than or equal to 1, and N is greater than or equal to M.

6. A cell handover control method for a communication system, 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 guard module can be communicatively connected to a service terminal guard module in a service terminal node to form a guard network, and the service base station can be communicatively connected to a service terminal in the service terminal node to form a service network; The cell handover control method of the communication system includes: Periodically send a message of its own current working frequency indication instruction through the guard network; When the current service terminal staying in the source cell has determined the target cell to be handed over, and there is no handover parameter information of the target cell in the service terminal guard module of the current service terminal staying in the source cell, receive the handover parameter information request from the service terminal guard module; wherein, the current service terminal stays in the source cell deployed by the first service base station, and at least one working cell adjacent to the source cell forms a target cell; Judge whether there is handover parameter information currently according to the handover parameter information request; When it is determined that there is switching parameter information for itself, send the switching parameter information to the service terminal protection module; the service terminal protection module can, according to the switching parameter information received within a preset time, send the switching parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

7. The cell handover control method of the communication system according to claim 6, characterized in that, The cell handover control method of the communication system further includes: If it is determined that there is no switching parameter information for itself currently, send a switching parameter information request to the service base station, and the service base station can return the switching parameter information according to the switching parameter information request; Receive the switching parameter information returned by the service base station and send the switching parameter information to the service terminal protection module.

8. A cell handover control device for a communication system, which is used to implement the cell handover control method of the communication system according to any one of claims 1 to 5, 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 cell handover control device of the communication system includes: A first receiving module, configured to receive in real time a working frequency indication instruction message sent by at least one service base station protection module. Among them, the current service terminal resides in a source cell deployed by a first service base station, and at least one working cell adjacent to the source cell forms a target cell; A first judging module, configured to judge whether there is switching parameter information of the target cell when it has been determined that the target cell to which the current service terminal needs to hand over; A first sending module, configured to, if there is no switching parameter information of the target cell, send a switching parameter information request to the service base station protection module corresponding to the target cell. Among them, the service base station protection module can determine whether there is switching parameter information for itself currently according to the switching parameter information request, and can return the switching parameter information when there is switching parameter information; A handover module, configured to, if there is switching parameter information of the target cell, or receive the switching parameter information returned by the service base station protection module within a preset time, send the switching parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

9. A cell handover control device for a communication system, which is used to implement the cell handover control method of the communication system according to claim 6 or 7, 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 protection module communicatively connected to the service base station. The service base station protection module can be communicatively connected to a service terminal protection module in a service terminal node to form a protection network, and the service base station can be communicatively connected to a service terminal in the service terminal node to form a service network; the cell handover control device of the communication system includes: A second sending module, configured to periodically send a working frequency indication instruction message of itself through the protection network; A second receiving module, configured to receive a handover parameter information request from a service terminal escort module when a current service terminal resident in a source cell has determined a target cell to be handed over to and the service terminal escort module of the current service terminal resident in the source cell does not have handover parameter information of the target cell; wherein, the current service terminal resides in the source cell deployed by a first service base station, and at least one working cell adjacent to the source cell forms a target cell; A second judging module, configured to judge whether there is handover parameter information currently according to the handover parameter information request; A third sending module, configured to send the handover parameter information to the service terminal escort module when it is determined that there is handover parameter information currently; the service terminal escort module can, according to the handover parameter information received within a preset time, send the handover parameter information of the target cell to the service terminal and then lock the radio interface frequency of the current service terminal node to the radio interface frequency corresponding to the target cell, so as to complete the handover of the current service terminal from the source cell to the target cell.

10. A communication system, characterized in that, Comprising: A service base station node and a service terminal node, the service base station node and the service terminal node are communicatively connected, the service base station node includes a service base station and a service base station escort module, the service terminal node includes a service terminal and a service terminal escort module, the service terminal escort module includes the cell handover control device of the communication system recited in claim 8, the service base station escort module includes the cell handover control device of the communication system recited in claim 9, 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 escort module and the service terminal escort module can form an escort network.

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