Cell switching control method and device of service terminal, terminal node and system

Abstract

The invention relates to the technical field of wireless communication, and particularly discloses a cell switching control method and device of a service terminal, a terminal node and a 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; judging whether the currently received working frequency indication instruction message is sent by a service base station guard module of the source cell; if not, determining the arrival equivalent path loss of the service base station corresponding to the working frequency indication instruction message according to the working frequency indication instruction message; determining a target cell of the current service terminal according to the arrival equivalent path loss; and locking the air interface frequency of the current service terminal node to the air interface frequency corresponding to the target cell so as to complete switching of the current service terminal from the source cell to the target cell. According to the cell switching control method of the service terminal provided by the invention, the effect that the service is still kept continuous when the terminal equipment is switched between the adjacent cells can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular, to a cell handover control method for a service terminal, a cell handover control device for a service terminal, a service terminal node, and a communication system. Background Art

[0002] Commercial cellular network technologies represented by 5G, with their excellent characteristics such as large bandwidth, low latency, and ultra-large-scale networking, have significantly changed people's lifestyles and promoted the rapid progress of society. Commercial cellular networks all operate on specific working frequencies, and these frequencies are not allowed to be used by other wireless devices to prevent interference with communication. When applying cellular networks to special fields, due to the lack of anti-interference ability of cellular networks, when encountering interference, communication degradation or even service interruption may occur. By using frequency conversion devices to synchronously change the air interface frequencies of cellular network base stations and terminals, network collaborative frequency switching can be achieved to avoid interference. However, when the terminal moves between the coverage areas of different base stations (cells), since the frequency conversion device cannot sense the timing of terminal neighbor cell measurement, it is difficult to ensure the rapid handover of the terminal between adjacent cells, which may then cause service interruption.

[0003] Therefore, how to ensure the handover of the terminal between adjacent cells to avoid service interruption during cell handover of terminal devices has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] The present invention provides a cell handover control method for a service terminal, a cell handover control device for a service terminal, a service terminal node, and a communication system, which solve the problem of service interruption during handover of terminal devices between adjacent cells in related technologies.

[0005] As a first aspect of the present invention, there is provided a cell handover control method for a service terminal, which is applied to a service terminal node. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal guard module can be communicatively connected to a service base station guard module in a service base station node to form a guard network, and the service terminal can be communicatively connected to a service base station in the service base station node to form a service network. The cell handover control method for the service terminal includes:

[0006] Receiving, in real time, a working frequency indication instruction message sent by at least one service base station guard module, where the current service terminal is located 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;

[0007] Determining whether the currently received working frequency indication instruction message is sent by the service base station guard module of the source cell where it is located;

[0008] If not, determine the arrival equivalent path loss of the corresponding serving base station according to the working frequency indication instruction message;

[0009] Determine the target cell of the current service terminal according to the arrival equivalent path loss;

[0010] 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.

[0011] Further, determining the arrival equivalent path loss of the corresponding serving base station according to the working frequency indication instruction message includes:

[0012] Determine the arrival normalized path loss of the serving base station guard module according to the transmit power information of the serving base station guard module in the working frequency indication instruction message;

[0013] Determine the arrival equivalent path loss of the serving base station according to the arrival normalized path loss of the serving base station guard module.

[0014] Further, determining the arrival normalized path loss of the serving base station guard module according to the transmit power information of the serving base station guard module in the working frequency indication instruction message includes:

[0015] Calculate the arrival normalized path loss of the serving base station guard module according to the transmit power of the serving base station guard module in the working frequency indication instruction message, the guard air interface received power of the current service terminal guard module, and the guard air interface received frequency. The calculation formula is:

[0016] PLn = transmit power of the serving base station guard module - guard air interface received power of the service terminal guard module - 20lgFs + Δ1,

[0017] where, PLn represents the arrival normalized path loss of the serving base station guard module, Fs represents the guard air interface received frequency of the current service terminal guard module, and Δ1 represents the first correction factor.

[0018] Further, determining the arrival equivalent path loss of the serving base station according to the arrival normalized path loss of the serving base station guard module includes:

[0019] Calculate the arrival equivalent path loss of the serving base station according to the arrival normalized path loss of the serving base station guard module and the air interface frequency of the cell where the service terminal is located. The calculation formula is:

[0020] Ple = PLn + 20lgFd + Δ2,

[0021] Wherein, Ple represents the arrival equivalent path loss of the service base station, Fd represents the air interface frequency of the cell where the service terminal is located, and Δ2 represents the second correction factor.

[0022] Further, determining the target cell of the current service terminal according to the arrival equivalent path loss includes:

[0023] Judging whether the arrival equivalent path loss of the service base station corresponding to the current source cell is greater than a first preset threshold;

[0024] If the arrival equivalent path loss of the service base station corresponding to the current source cell is greater than the first preset threshold, and the arrival equivalent path loss of the service base station corresponding to the non-source cell currently received is less than the preset target value, then determine the non-source cell as the target cell of the current service terminal;

[0025] If the arrival equivalent path loss of the service base station corresponding to the current source cell is not greater than the first preset threshold, no action is taken.

[0026] Further, the arrival equivalent path loss of the service base station corresponding to the non-source cell currently received is less than the preset target value, including:

[0027] The current arrival equivalent path loss of the service base station corresponding to the non-source cell currently received is less than a second preset threshold, and among the consecutive N arrival equivalent path losses of the service base station corresponding to the non-source cell currently received, 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.

[0028] Further, the cell handover method of the service terminal further includes:

[0029] Updating and storing the arrival equivalent path loss in real time according to the service base station index information, where the service base station index information at least includes the service base station ID information and the corresponding working cell ID information.

[0030] As another aspect of the present invention, there is provided a cell handover control device for a service terminal, wherein it is applied to a service terminal node, the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal, the service terminal 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 device of the service terminal includes:

[0031] A receiving module, configured to receive in real time a working frequency indication instruction message sent by at least one service base station guard module. Herein, the current service terminal is located 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;

[0032] A judging module, configured to judge whether the currently received working frequency indication instruction message is sent by the service base station guard module of the source cell where it is located;

[0033] A first determining module, configured to, if not, determine the arrival equivalent path loss of the corresponding service base station according to the working frequency indication instruction message;

[0034] A second determining module, configured to determine the target cell of the current service terminal according to the arrival equivalent path loss;

[0035] A switching module, configured to 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.

[0036] As another aspect of the present invention, there is provided a service terminal node, which includes a service terminal and a service terminal guard module communicatively connected to the service terminal, and the service terminal guard module includes the cell handover control device of the service terminal described above.

[0037] As another aspect of the present invention, there is provided a communication system, which is characterized by including: a service base station node and the service terminal node described above. 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 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.

[0038] The cell handover control method for the service terminal provided by the present invention receives in real time a working frequency indication instruction message sent by the service base station guard module, and determines whether it is sent by the source cell according to the message. When it is not sent by the source cell, the target cell to be handed over is determined according to the message by calculating the arrival equivalent path loss of the service base station guard module. This cell handover control method for the service terminal can measure the communication quality of different service base station guard modules, assist the service terminal to initiate a handover process, realize the fast handover of the service terminal node between different cells, ensure the 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 is not changed during this handover process. Description of the Drawings

[0039] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0040] Figure 1 It is a structural block diagram of the communication system provided by the present invention.

[0041] Figure 2 It is a structural block diagram of the service terminal guard module provided by the present invention.

[0042] Figure 3 It is a structural block diagram of the cell handover control device of the service terminal provided by the present invention.

[0043] Figure 4 It is a flowchart of the cell handover control method of the service terminal provided by the present invention.

[0044] Figure 5 It is a flowchart of determining the arrival equivalent path loss provided by the present invention.

[0045] Figure 6 It is a flowchart of determining the target cell of the current service terminal provided by the present invention.

[0046] Figure 7 It is an architecture diagram of the service terminal node and the service base station node without the cell handover control scheme currently.

[0047] Figure 8 It is a network structure diagram of the communication system provided by the present invention.

[0048] Figure 9 It is an architecture diagram of the service terminal node and the service base station node with the cell handover control scheme provided by the present invention.

[0049] Figure 10 It is a flowchart of the specific implementation of the cell handover control method of the service terminal provided by the present invention.

[0050] Figure 11 It is a structural block diagram of the guard module for setting multiple communication units provided by the present invention.

[0051] Figure 12 It is a structural block diagram of setting multiple auxiliary frequency handover units provided by the present invention. Specific Embodiments

[0052] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all 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.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device 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.

[0055] Currently, under the 3GPP standard system, the operating frequency point of a cell (deployed on a base station) is periodically transmitted in the air interface system message as an important system parameter. Once a cell is established, the operating frequency point generally does not change, unless cell reconfiguration is performed, which involves a complex base station configuration management process and usually has a large time delay, generally at the minute level. Therefore, when a terminal accesses a cell, it is difficult to ensure the service continuity during the 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 communication, the anti-interference ability is even affected due to the difficulty in ensuring the continuity of the frequency switching.

[0056] Based on this, in the embodiments of the present invention, a communication system 10 is provided, as Figure 1 shown, including a service base station node 100 and a service terminal node 200 communicatively connected to the service base station node 100. The service base station node 100 includes a service base station 110 and a service base station guard module 120. 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.

[0057] In the embodiments of the present invention, the service base station is mainly the base station of the service network, such as a 5G base station; the service base station guard module is mainly used to integrate with the service base station, support interconnection and interoperability with the service terminal guard module and other service base station guard modules, and form a guard network.

[0058] 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.

[0059] In addition, the service network is mainly a wireless communication network composed of service base stations and service terminals, used for service bearing, such as 4G cellular network, 5G cellular network, etc.; the guard network is mainly composed of service base station guard modules and service terminal guard modules, and is mainly used to provide coordinated frequency switching for service base stations or service terminals to avoid anti-interference guard capabilities.

[0060] It should be understood that in the embodiments of the present invention, the service terminal deploys the service terminal guard module, constructs a guard network with the service base station guard module deployed on the service base station, and the service terminal guard module receives the network coordinated frequency switching instruction from the service base station guard module. This instruction notifies the occurrence time and target frequency point of the frequency change of the service terminal node. The service terminal guard module assists the service terminal to directly switch 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 sense the air interface spectrum situation in real time and avoid interference.

[0061] It should be noted that when the service terminal does not deploy the terminal guard module, the frequency of the service terminal needs to implement initial frequency determination and frequency switching through the standard 3GPP protocol. Since the 3GPP protocol itself has the problem of poor anti-interference ability, therefore, the communication system provided by the present invention, by deploying the service terminal guard module on the service terminal and the service base station guard module on the service base station, the service terminal guard module and the service base station guard module can assist the service base station and the service terminal to synchronously change the working frequency to achieve network coordinated frequency change. At the same time, the service terminal guard module deployed on the service terminal side interacts with different service base station guard modules and assists the service terminal to select the best cell for handover based on the communication measurement results, so as to ensure that the entire communication network has strong anti-interference ability and realize the fast handover of the terminal device when moving at the cell edge, avoiding service interruption when the terminal device performs cell handover.

[0062] As another embodiment of the present invention, a service terminal node 200 is provided, such asFigure 1 As shown, it includes a service terminal 210 and a service terminal guard module 220 communicatively connected to the service terminal 210. The service terminal guard module 220 includes a cell handover control device 300 of the service terminal described below.

[0063] In an embodiment of the present invention, the service terminal node 200 includes a service terminal guard module. The service terminal guard module and the service base station guard module included in the service base station node can construct a guard network independent of the service network to implement 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, supporting synchronous handover of the radio interface frequencies of the service base station node and the service terminal node.

[0064] As Figure 2 shown, taking the block diagram of the service terminal guard module 220 as an example, it includes at least an intelligent control unit 221, a communication unit 222, an auxiliary frequency handover unit 223, a spectrum sensing unit 224, and a clock unit 225.

[0065] Among them, the communication unit 222 interacts with other guard modules to construct a guard network, establishes an interaction channel between the guard modules, and maintains a network-level time synchronization relationship between the guard modules. The communication unit provides a bearer service externally through a service interface to assist in expanding the coverage of the service network. At the same time, when the service network is interrupted, it can also provide a guaranteed communication service.

[0066] The auxiliary frequency handover unit 223 is used to assist the external device (service base station / service terminal) connected to the service radio frequency interface to perform a two-way handover between the operating frequency and the radio interface frequency at a given moment under the control of the intelligent control unit. The handover process is transparent to the external device.

[0067] The spectrum sensing unit 224 is used to sense and monitor the radio interface spectrum situation under the control of the intelligent control unit;

[0068] 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 guard module. When an external synchronization signal is input, the clock unit can adjust the local clock based on the external synchronization signal. When no external synchronization signal is input, the clock unit can adjust the local clock according to the output of the communication unit.

[0069] 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, generates the specific air interface frequency change time and the specific frequency point numbers to be used based on this frequency usage strategy, and spreads them to the intelligent control units of other modules through the communication unit, collaboratively controls the auxiliary frequency switching unit to synchronously switch frequencies, realizes the real-time change of the air interface frequency of the service network, and avoids interference; the intelligent control unit can also perform collaborative control on the analog base station and the terminal through the control interface.

[0070] The service air interface is specifically represented as the input / output interface of the service network air interface frequency, that is, the actual air interface of the service network; the guard air interface is specifically represented as the air interface of the guard network, which is multiplexed by the communication unit and the spectrum sensing unit.

[0071] In addition, in the embodiment of the present invention, the intelligent control unit 221 further includes a cell handover control device 300 for the service terminal. Through the cell handover control device 300 for the service terminal, the service terminal node can be quickly switched between different cells, ensuring the service continuity during the handover of the service terminal. At the same time, the protocol process of the service base station and the service terminal does not change during this handover process.

[0072] Specifically, in the embodiment of the present invention, as Figure 3 shown, the cell handover control device 300 for the service terminal includes:

[0073] A receiving module 310, configured to receive in real time a working frequency indication instruction message sent by at least one service base station guard module. Among them, the current service terminal is located 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;

[0074] A judging module 320, configured to judge whether the currently received working frequency indication instruction message is sent by the service base station guard module of the source cell where it is located;

[0075] A first determination module 330, configured to, if not, determine the arrival equivalent path loss of the service base station corresponding to it according to the working frequency indication instruction message;

[0076] A second determination module 340, configured to determine the target cell of the current service terminal according to the arrival equivalent path loss;

[0077] A switching module 350, configured to 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.

[0078] 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 determining whether it is sent by the service base station guard module corresponding to the source cell according to this message, when it is not sent by the service base station guard module corresponding to the source cell, then according to this message, the target cell to be switched to is determined by calculating the arrival equivalent path loss of the service base station. This method can measure the communication quality of different service base station guard modules, assist the service terminal to initiate a handover process, realize the fast handover of the service terminal node between different cells, ensure the service continuity during the handover of the service terminal, and at the same time, the protocol process of the service base station and the service terminal remains unchanged during this handover process.

[0079] Therefore, for the service terminal node provided by the present invention, by setting a service terminal guard module, and setting a cell handover control device of the service terminal in the service terminal guard module, it can receive a working frequency indication instruction message from the service base station guard module through the guard network, and based on this message, measure the communication quality of different service base station guard modules, assist the service terminal to initiate a handover process, realize the fast handover of the service terminal node between different cells, ensure the service continuity during the handover of the service terminal, and at the same time, the protocol process of the service base station and the service terminal remains unchanged during this handover process.

[0080] As another embodiment of the present invention, a cell handover control method for a service terminal is provided, which is applied to a service terminal node. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service terminal guard module can be communicatively connected to a service base station guard module in 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 service terminal includes:

[0081] S100. Receive in real time a working frequency indication instruction message sent by at least one service base station guard module. Herein, the current service terminal is located 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;

[0082] In an embodiment of the present invention, after the service base station node is started, the service base station guard module periodically diffuses externally its currently used working frequency indication instruction, and forms a working frequency indication instruction message that is received by the service terminal guard module. The cell where the current service terminal is located is deployed in the first service base station to form a source cell. At least one working cell adjacent to the source cell forms a target cell.

[0083] It should be noted that in the embodiments of the present invention, the source cell and the target cell may both 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.

[0084] S200. Determine whether the currently received working frequency indication command message is sent by the service base station guard module of the source cell where it is located;

[0085] After receiving the working frequency indication command message, the service terminal guard module can transmit it to the service terminal, and determine whether the working frequency indication command message received by the service terminal is sent by the source cell where it is located, that is, whether it is sent by the service base station guard module of the source cell where it is located.

[0086] In the embodiments of the present invention, the working frequency indication command 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 service base station guard module transmit power.

[0087] S300. If not, determine the arrival equivalent path loss of the service base station corresponding to the working frequency indication command message;

[0088] In the embodiments of the present invention, when the service terminal guard module determines that the working frequency indication command message is not sent by the service base station guard module corresponding to the source cell, the arrival equivalent path loss of the service base station corresponding to the service base station guard module that sends the working frequency indication command message to the current service terminal is determined according to the working frequency indication command message.

[0089] It should be understood here that if the working frequency indication command 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.

[0090] S400. Determine the target cell of the current service terminal according to the arrival equivalent path loss;

[0091] The target cell of the current service terminal can be determined according to the calculated arrival equivalent path loss of the service base station to the current service terminal.

[0092] S500. 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.

[0093] After determining the target cell of the current service terminal, lock the air interface frequency of the current service terminal node to the air interface frequency corresponding to the target cell to complete the cell handover of the service terminal.

[0094] This cell handover control method for the service terminal of the present invention receives in real time the working frequency indication command message sent by the service base station guard module, and determines whether it is sent by the service base station guard module corresponding to the source cell according to this message. When it is not sent by the service base station guard module corresponding to the source cell, the target cell to be handed over is determined by calculating the arrival equivalent path loss of the service base station according to this message. This cell handover control method for the service terminal can measure the communication quality of different service base station guard modules, assist the service terminal to initiate the handover process, realize the fast handover of the service terminal node between different cells, ensure the service continuity during the handover of the service terminal, and at the same time, the protocol process of the service base station and the service terminal does not change during this handover process.

[0095] Specifically, determine the arrival equivalent path loss of the service base station corresponding to the working frequency indication command message, as Figure 5 shown, including:

[0096] S310. Determine the arrival normalized path loss of the service base station guard module according to the transmit power information of the service base station guard module in the working frequency indication command message;

[0097] It should be understood that determine the arrival normalized path loss of the service base station guard module to the current service terminal guard module according to the transmit power of the service base station guard module in the working frequency indication command message.

[0098] Specifically, the determination of the arrival normalized path loss of the service base station guard module according to the transmit power information of the service base station guard module in the working frequency indication command message includes:

[0099] 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, the guard air interface received power of the current service terminal guard module, and the guard air interface received frequency in the working frequency indication command message. The calculation formula is:

[0100] PLn = transmit power of the service base station guard module - guard air interface received power of the service terminal guard module - 20lgFs + Δ1,

[0101] where, PLn represents the arrival normalized path loss of the service base station guard module, Fs represents the guard air interface received frequency of the current service terminal guard module, and Δ1 represents the first correction factor.

[0102] S320. Determine the arrival equivalent path loss of the service base station according to the arrival normalized path loss of the service base station guard module.

[0103] In an embodiment of the present invention, determining the arrival equivalent path loss of a service base station according to the arrival normalized path loss of a service base station guard module includes:

[0104] Calculating 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 radio interface frequency of the cell where the service terminal is located. The calculation formula is:

[0105] Ple = PLn + 20lgFd + Δ2,

[0106] where Ple represents the arrival equivalent path loss of the service base station, Fd represents the radio interface frequency of the cell where the service terminal is located, and Δ2 represents the second correction factor.

[0107] It should be noted that in an embodiment of the present invention, the first correction factor and the second correction factor can be regarded as empirical values related to frequency, terrain, weather, antennas, etc.

[0108] In an embodiment of the present invention, determining the target cell of the current service terminal according to the arrival equivalent path loss is as Figure 6 shown and includes:

[0109] S410. Judging whether the arrival equivalent path loss of the service base station corresponding to the current source cell is greater than a first preset threshold value;

[0110] S420. If the arrival equivalent path loss of the service base station corresponding to the current source cell is greater than the first preset threshold value, and the arrival equivalent path loss of the service base station corresponding to the currently received non-source cell is less than a preset target value, then determine that the non-source cell is the target cell of the current service terminal;

[0111] In an embodiment of the present invention, the arrival equivalent path loss of the service base station corresponding to the currently received non-source cell being less than a preset target value includes:

[0112] The current arrival equivalent path loss of the service base station corresponding to the currently received non-source cell is less than a second preset threshold value, and among the consecutive N arrival equivalent path losses of the service base station corresponding to the currently received non-source cell, M times are less than the second preset threshold value. Both M and N are natural numbers greater than or equal to 1, and N is greater than or equal to M.

[0113] It should be understood that in an embodiment of the present invention, for the current arrival equivalent path loss of the service base station corresponding to the currently received non-source cell being less than the second preset threshold value, it is also necessary to judge whether among the consecutive N arrival equivalent path losses, M times are all less than the second preset threshold value. 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 value.

[0114] S430. If the equivalent path loss from the serving base station corresponding to the current source cell is not greater than the first preset threshold, no action is taken.

[0115] In an embodiment of the present invention, the cell handover method of the service terminal further includes:

[0116] The equivalent path loss of arrival is stored 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.

[0117] It should be understood that the serving base station index information can be specifically determined according to the serving base station ID and the working cell ID information in the received working frequency indication command message. That is, every time a working frequency indication command message is received, the serving base station ID and the corresponding working cell ID in the working frequency indication command message are recorded once, and every time a working frequency indication command message is received, the equivalent path loss of arrival from the serving base station corresponding to the serving base station guard module that issues the working frequency indication command message to the current service terminal is also calculated once, and the latest calculated equivalent path loss of arrival is updated and stored based on the corresponding serving base station ID and working cell ID.

[0118] The following describes in detail the specific working process of the cell handover control method of the service terminal of the present invention.

[0119] For the convenience of problem description, it is assumed that 1 cell is deployed on the serving base station (the scheme is similar when multiple cells are deployed on the serving base station).

[0120] After the serving base station node is started, the working frequency configured by the cell locked thereon is, for example Figure 8 As shown, the working frequencies of the cells deployed on serving base station 1 and serving base station 2 are F1 and F2 respectively (where F1 and F2 of the TDD cell represent a single frequency, and F1 and F2 of the FDD cell represent a pair of frequencies). After being frequency-converted by the serving base station guard module, the air interface frequencies of the service network are converted into F1' and F2', where F1 and F2 can be the same or different, and F1' and F2' can be the same or different.

[0121] After the serving base station node is started, the serving base station guard module periodically diffuses the working frequency indication command currently actually used by itself to the outside, which is used to indicate the air interface frequency that the service terminal node should lock. The working frequency indication command at least includes: message sequence number, serving base station ID, working cell ID, cell working frequency (corresponding to the working frequency configured by the serving base station), cell air interface frequency (corresponding to the air interface frequency of the serving base station node), cell transmit power, serving base station guard module transmit power and other parameters.

[0122] Based on the signal quality and working frequency indication instructions received from different service base station guard modules, the service terminal guard module selects the optimal working cell (such as the cell with the best received signal quality) to lock the working frequency. For example, Figure 7 As shown, the service terminal guard module sets its own auxiliary frequency switching unit to lock the radio interface frequency of the service terminal node at F1'. After frequency conversion by the service terminal guard module, the information of the service base station will be input into the service terminal at frequency F1. Therefore, the working frequencies of the service terminal and the service base station are F1, and the radio interface frequency is F1'. The above process does not involve changes to the standard protocol and can work normally. However, when the service terminal node moves to the edge of cell 1 and enters the coverage area of cell 2, the standard protocol system will cause the service terminal to stay in only one cell until it drops the connection and then searches for a suitable cell to access again.

[0123] The present invention solves the above problems by setting corresponding guard modules on the service base station node and the service terminal node for real-time measurement and interaction.

[0124] For example, Figure 8 As shown in the network, a cell (source cell) is deployed on service base station node 1, and a cell (target cell) is deployed on service base station node 2. The coverage areas of the source cell and the target cell are as shown by the dashed circles in Figure 9 The service terminal node 3 is located in the coverage areas of both the source cell and the target cell and is at the coverage edge of the two cells; other service terminal nodes are located in the respective coverage areas of the source cell and the target cell.

[0125] Assume that the current service terminal node 3 has stayed in the source cell and is moving towards the coverage area of the target cell. The communication coverage of the service base station guard module of service base station node 1 is roughly equivalent to that of the source cell, and the communication coverage of the service base station guard module of service base station node 2 is roughly equivalent to that of the target cell. The guard modules are interconnected through the guard network. Then, the service terminal node 3 can determine whether to perform a cell handover based on the working frequency indication instruction cell received in real time.

[0126] It should be noted that when the service terminal stays in the source cell, the source cell provides service bearer. The working frequency of the source cell is F1, and the radio interface frequency is F1'; the working frequency of the target cell is F2, and the radio interface frequency is F2'. When F1'≠F2', the service terminal cannot receive the service information of the target cell.

[0127] In addition, the service base station guard module of service base station node 1 periodically diffuses the working frequency indication instruction it is currently actually using to the outside through the guard network. The instruction at least includes parameters such as message sequence number, service base station ID, working cell ID, cell working frequency (F1), cell radio interface frequency (F1'), cell transmit power, and service base station guard module transmit power.

[0128] The service base station guard module of the service base station node 2 periodically diffuses externally the working frequency indication instruction currently being actually used by itself, and this instruction at least includes: parameters such as message sequence number, service base station ID, working cell ID, cell working frequency (F2), cell air interface frequency (F2’), cell transmit power, and service base station guard module transmit power.

[0129] Specifically, when the service terminal node 3 receives the working frequency indication instruction, as Figure 9 and Figure 10 shown, the following actions are performed:

[0130] a. Based on the transmit power of the service base station guard module and the antenna port power received by the service terminal guard module (i.e., the guard air interface received power of the service terminal corresponding to the service terminal guard module), calculate the arrival normalized path loss PLn and arrival equivalent path loss Ple from the cell corresponding service base station node to the service terminal node 3:

[0131] PLn = transmit power of service base station guard module (dBm) - guard air interface received power of service terminal guard module (dBm) - 20lgFs + Δ1;

[0132] Where: Fs represents the guard air interface received frequency of the current service terminal guard module; Δ1 represents the first correction factor;

[0133] Ple = PLn + 20lgFd + Δ2;

[0134] Where: Fd represents the air interface frequency of the cell where the service terminal is located; Δ2 represents the second correction factor.

[0135] b. The service terminal guard module of the service terminal node 3 uses the service base station ID + working cell ID as an index to update the Ple of this cell saved locally;

[0136] c. If the newly received "working frequency indication instruction" corresponds to the service terminal serving cell (source cell), the process ends;

[0137] d. Otherwise, the service terminal guard module of the service terminal node 3 makes a handover decision:

[0138] ① If the Ple(s) corresponding to the current serving cell is greater than the first preset threshold and the newly calculated Ple(d) is less than the second preset threshold and Ple(d) - Ple(s) < the third preset threshold, then the service terminal guard module switches the actual working frequency of the service terminal node to F2’, that is, by actively creating conditions to make the service terminal node 3 perform a hard handover from the source cell to the target cell.

[0139] ② Otherwise, no action is taken and the process ends.

[0140] It should be understood that after the radio interface frequency of the service terminal node is locked to F2', the service terminal will receive the system message sent by the target cell on the frequency F2 (operating frequency), and initiate an access process in the target cell through F2 to complete the hard handover process to the target cell.

[0141] In the embodiment of the present invention, it should be noted that if F1 = F2, that is, the service base stations use the same frequency for networking, and the service base station guard modules independently control the radio interface frequencies of the service base station nodes for reasons such as spectrum situation, the above cell handover process will be accelerated. Because after the guard module of the service terminal node 3 switches the radio interface frequency from F1' to F2', the operating frequency of the service terminal 3 does not change, and the system message of the target cell can be immediately received, so the handover process between cells is accelerated.

[0142] It should be understood that when multiple cells are deployed on a service base station, an independent service base station guard module can be correspondingly deployed for each cell, and the cell coverage is roughly equivalent to the communication coverage of the service base station guard module. At this time, the handover process is the same as described above.

[0143] In addition, in the embodiment of the present invention, in order to enable a guard module to support the deployment of multiple cells, the ability of a single guard unit to support the deployment of multiple cells can be achieved by increasing the number of auxiliary frequency switching units and communication units; when the communication unit has multi-channel processing capabilities, only one communication unit can be deployed for the guard module, as Figure 11 and Figure 12 shown. The service radio frequency interfaces correspond one-to-one with the service radio interfaces; the number of guard radio interfaces, the number of service radio frequency interfaces, and the number of service radio interfaces are the same.

[0144] In summary, the cell handover control method for the service terminal provided by the present invention aims at the problem that cell handover in the current collaborative frequency change network is likely to cause service interruption. By measuring the communication quality of different service base station guard modules by the service guard module, it 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 protocol process of the service base station and the service terminal remains unchanged during this handover process.

[0145] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A cell handover control method for a service terminal, 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 service terminal includes: Receiving in real time a working frequency indication command message sent by at least one service base station guard module. Here, the current service terminal is located 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; Judging whether the currently received working frequency indication command message is sent by the service base station guard module of the source cell where it is located; If not, determining the arrival equivalent path loss of the service base station corresponding to the working frequency indication command message; Determining the target cell of the current service terminal according to the arrival equivalent path loss; Locking 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.

2. The cell handover control method for the service terminal according to claim 1, wherein Determining the arrival equivalent path loss of the service base station corresponding to the working frequency indication command message includes: Determining the arrival normalized path loss of the service base station guard module according to the transmission power information of the service base station guard module in the working frequency indication command message; Determining the arrival equivalent path loss of the service base station according to the arrival normalized path loss of the service base station guard module.

3. The cell handover control method of the service terminal according to claim 2, wherein Determining the arrival normalized path loss of the service base station guard module according to the transmission power information of the service base station guard module in the working frequency indication command 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 in the working frequency indication command message, the guard air interface received power of the current service terminal guard module, and the guard air interface received frequency. The calculation formula is: PLn = transmission power of the service base station guard module - guard air interface received power of the service terminal guard module - 20lgFs + Δ1, where, PLn represents the arrival normalized path loss of the service base station guard module, Fs represents the guard air interface received frequency of the current service terminal guard module, and Δ1 represents the first correction factor.

4. The cell handover control method for a service terminal according to claim 2, wherein Determining the arrival equivalent path loss of the service base station according to the arrival normalized path loss of the service base station guard module includes: Calculating 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 cell where the service terminal is located. The calculation formula is: Ple = PLn + 20lgFd + Δ2, where, Ple represents the arrival equivalent path loss of the service base station, Fd represents the air interface frequency of the cell where the service terminal is located, and Δ2 represents the second correction factor.

5. The cell handover control method of the service terminal according to any one of claims 1 to 4, characterized in that, Determining the target cell of the current service terminal according to the arrival equivalent path loss includes: Judging whether the arrival equivalent path loss of the service base station corresponding to the current source cell is greater than a first preset threshold; If the equivalent path loss from the serving base station corresponding to the current source cell is greater than a first preset threshold, and the equivalent path loss from the serving base station corresponding to the non-source cell currently received is less than a preset target value, then determine that the non-source cell is the target cell of the current service terminal; If the equivalent path loss from the serving base station corresponding to the current source cell is not greater than the first preset threshold, then no action is taken.

6. The method for controlling cell handover of the service terminal according to claim 5, wherein, The equivalent path loss from the serving base station corresponding to the non-source cell currently received being less than the preset target value includes: The current equivalent path loss from the serving base station corresponding to the non-source cell currently received is less than a second preset threshold, and among the consecutive N equivalent path losses from the serving base station corresponding to the non-source cell currently received, M 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.

7. The cell handover control method for a service terminal according to any one of claims 1 to 4, characterized in that, The cell handover method of the service terminal further includes: Updating and storing the equivalent path loss in real time according to the serving base station index information, where the serving base station index information at least includes serving base station ID information and the corresponding working cell ID information.

8. A cell handover control device for a service terminal, 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 the serving base station guard module in the serving base station node to form a guard network, and the service terminal can be communicatively connected to the serving base station in the serving base station node to form a service network; The cell handover control device of the service terminal includes: A receiving module, configured to receive in real time a working frequency indication instruction message sent by at least one serving base station guard module. Among them, the current service terminal is located in the source cell deployed by the first serving base station, and at least one working cell adjacent to the source cell forms a target cell; A judgment module, configured to judge whether the currently received working frequency indication instruction message is sent by the serving base station guard module of the source cell where it is located; A first determination module, configured to, if not, determine the equivalent path loss of the serving base station corresponding thereto according to the working frequency indication instruction message; A second determination module, configured to determine the target cell of the current service terminal according to the equivalent path loss; A handover module, configured to 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.

9. A service terminal node, characterized in that, Includes a service terminal and a service terminal guard module communicatively connected to the service terminal, and the service terminal guard module includes the cell handover control device of the service terminal as claimed in claim 8.

10. A communication system, characterized in that, Includes: A serving base station node and the service terminal node as claimed in claim 9. The serving base station node and the service terminal node are communicatively connected. The serving base station node includes a serving base station and a serving base station guard module, and the service terminal node includes a service terminal and a service terminal guard module. The communication connection between the serving base station and the service terminal can form a service network, and the communication connection between the serving base station guard module and the service terminal guard module can form a guard network.

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