CN113615245B

CN113615245B - Switching control method, device, equipment and storage medium

Info

Publication number: CN113615245B
Application number: CN201980092590.6A
Authority: CN
Inventors: 杨宁
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2023-09-22
Anticipated expiration: 2039-08-06
Also published as: WO2021022489A1; CN113615245A

Abstract

A switching control method, device, equipment and storage medium belong to the technical field of communication. The method comprises the following steps: the first network device sends first configuration information to the terminal (401); the terminal transmits a first signal (402) according to the first configuration information; the first network device sends measurement indication information to a second network devices, wherein a is a positive integer (403); the second network device measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, where the first measurement result is used to decide whether to switch the network device connected with the terminal (404). The method ensures the reliability of switching and data transmission on one hand and reduces the time delay of switching and the signaling overhead of an air interface on the other hand.

Description

Switching control method, device, equipment and storage medium

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a switching control method, a switching control device, switching control equipment and a storage medium.

Background

In a mobile communication system, a terminal may be handed over between different serving cells, i.e., establish a connection with different base stations, due to mobility of the terminal.

Currently, the cellular communication network adopts the following handover scheme: the source base station configures a downlink reference signal for a terminal, and the terminal can measure and report the downlink reference signal according to the configuration of the source base station; the source base station sends a switching request message to the target base station based on a measurement result reported by the terminal, wherein the switching request message is used for requesting the terminal to be switched from the source base station to the target base station; after the target base station agrees to the switching request message, the source base station sends a switching command to the terminal, wherein the switching command is used for indicating the terminal to switch from the source base station to the target base station; after receiving the switching command, the terminal disconnects with the source base station, initiates a random access flow to the target base station, and establishes connection with the target base station, thereby completing switching from the source base station to the target base station.

For NTN (Non Terrestrial Network, non-terrestrial communication network) systems, a satellite communication mode is generally adopted to provide communication service for terrestrial users, the transmission delay of wireless signals between a terminal and a satellite is relatively large, and the satellite has the characteristic of fast movement relative to the ground, if the base station still determines whether to execute handover based on measurement and reporting of a downlink reference signal, the effectiveness of the base station on handover judgment is reduced, and handover performance is affected.

Disclosure of Invention

The embodiment of the application provides a switching control method, a switching control device, switching control equipment and a storage medium, which can be used for solving the technical problems. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a handover control method, where the method includes:

the method comprises the steps that first network equipment sends first configuration information to a terminal, wherein the first configuration information is used for indicating the sending configuration of a first signal;

the first network device sends measurement indication information to a second network devices, the measurement indication information is used for indicating the a second network devices to measure the first signals sent by the terminal to obtain a first measurement result, the first measurement result is used for deciding whether to switch the network devices connected with the terminal, and a is a positive integer.

In another aspect, an embodiment of the present application provides a handover control method, where the method includes:

the second network equipment receives measurement indication information sent by the first network equipment;

and the second network equipment measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, wherein the first measurement result is used for deciding whether to switch the network equipment connected with the terminal.

the terminal receives first configuration information, wherein the first configuration information is used for indicating the transmission configuration of a first signal;

the terminal sends the first signal according to the first configuration information;

the measurement result of the first signal is used for a network side to decide whether to switch the network equipment connected with the terminal.

the method comprises the steps that first network equipment receives a measurement result of a downlink reference signal sent by a terminal;

the first network device sends a switching request message to at least one second network device according to the measurement result, wherein the switching request message is used for requesting the terminal to be switched to the at least one second network device;

the first network device receives a switching confirmation message sent by a target second network device in the at least one second network device, wherein the switching confirmation message is used for confirming the terminal to be switched to the target second network device;

and under the condition that the first network equipment confirms that the target second network equipment meets the specified condition, the first network equipment does not send a switching command to the terminal.

In still another aspect, an embodiment of the present application provides a handover control apparatus, which is applied to a first network device, where the apparatus includes:

the configuration information sending module is used for sending first configuration information to the terminal, wherein the first configuration information is used for indicating the sending configuration of the first signal;

the measurement indication sending module is used for sending measurement indication information to a second network devices, the measurement indication information is used for indicating the a second network devices to measure the first signals sent by the terminal to obtain a first measurement result, the first measurement result is used for deciding whether to switch the network devices connected with the terminal, and a is a positive integer.

In still another aspect, an embodiment of the present application provides a handover control apparatus applied to a second network device, where the apparatus includes:

the measurement indication receiving module is used for receiving measurement indication information sent by the first network equipment;

and the uplink signal measurement module is used for measuring a first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, and the first measurement result is used for deciding whether to switch the network equipment connected with the terminal.

In still another aspect, an embodiment of the present application provides a handover control apparatus, which is applied to a terminal, including:

the configuration information receiving module is used for receiving first configuration information, and the first configuration information is used for indicating the transmission configuration of the first signal;

the uplink signal sending module is used for sending the first signal according to the first configuration information;

the measuring result receiving module is used for receiving the measuring result of the downlink reference signal sent by the terminal;

a switching request sending module, configured to send a switching request message to at least one second network device according to the measurement result, where the switching request message is used to request the terminal to be switched to the at least one second network device;

a confirmation message receiving module, configured to receive a handover confirmation message sent by a target second network device in the at least one second network device, where the handover confirmation message is used to confirm handover of the terminal to the target second network device;

And the specified condition confirming module is used for not sending a switching command to the terminal under the condition that the target second network equipment is confirmed to meet the specified condition.

In yet another aspect, an embodiment of the present application provides a network device, where the network device includes a processor and a memory, where the memory stores a computer program, where the computer program is configured to be executed by the processor to implement the handover control method on the first network device side and/or implement the handover control method on the second network device side.

In yet another aspect, an embodiment of the present application provides a terminal, where the terminal includes a processor and a memory, where the memory stores a computer program, and the computer program is configured to be executed by the processor to implement the above-mentioned handover control method on the terminal side.

In yet another aspect, an embodiment of the present application provides a computer readable storage medium, where a computer program is stored, where the computer program is configured to be executed by a processor to implement the handover control method on the first network device side and/or implement the handover control method on the second network device side.

In yet another aspect, an embodiment of the present application provides a computer readable storage medium having stored therein a computer program for execution by a processor to implement the above-described terminal-side handover control method.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

the method comprises the steps that a first signal sent by a terminal is measured through a network side, a switching decision is made based on a measurement result of the first signal, and for a scene of high transmission delay or high mobility between the terminal and network equipment, on one hand, the problem that the network side cannot acquire the measurement result or acquires the measurement result which has failed is avoided, so that switching reliability is guaranteed, the terminal can be smoothly switched from one network equipment to another network equipment, the network side is guaranteed to have network equipment serving the terminal all the time, and further the reliability of data transmission of the terminal is guaranteed; on the other hand, the first signal sent by the terminal is measured through the network side, so that the step of reporting the measurement result by the terminal is omitted, the time delay of switching is reduced, and the signaling overhead of an air interface is also reduced.

Drawings

FIG. 1 is a schematic diagram of a network architecture provided by one embodiment of the present application;

FIG. 2 is a schematic diagram of a network architecture according to another embodiment of the present application;

FIG. 3 is a schematic diagram of a network architecture according to another embodiment of the present application;

FIG. 4 is a flow chart of a handover control method provided by an embodiment of the present application;

fig. 5 is a flowchart of a handover control method according to another embodiment of the present application;

fig. 6 is a flowchart of a handover control method according to another embodiment of the present application;

fig. 7 is a flowchart of a handover control method according to another embodiment of the present application;

fig. 8 is a flowchart of a handover control method according to another embodiment of the present application;

fig. 9 is a block diagram of a handover control apparatus according to an embodiment of the present application;

fig. 10 is a block diagram of a handover control apparatus according to another embodiment of the present application;

fig. 11 is a block diagram of a handover control apparatus according to another embodiment of the present application;

fig. 12 is a block diagram of a handover control apparatus according to another embodiment of the present application;

fig. 13 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided by the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided by the embodiments of the present application is applicable to similar technical problems.

Referring to fig. 1, a schematic diagram of a network architecture according to an embodiment of the application is shown. The network architecture may include: a network device 10 and a terminal 20.

The network device 10 is a device for providing wireless communication services to the terminal 20. A connection may be established between the network device 10 and the terminal 20 over an air interface so that communication, including interaction of signaling and data, may take place over the connection. The number of network devices 10 may be plural, and two adjacent network devices 10 may communicate with each other by wired or wireless means. The terminal 20 may switch between different network devices 10, i.e. establish a connection with different network devices 10.

In one example, as shown in fig. 2, the network device 10 in the NTN network may be a satellite 11, for example. One satellite 11 may cover a range of ground areas and provide wireless communication services to terminals 20 on the ground areas. In addition, the satellites 11 can orbit the earth, and communication coverage of different areas of the earth surface can be achieved by arranging a plurality of satellites 11.

Satellite communications have many unique advantages over terrestrial cellular communication networks. First, satellite communications are not limited by the user region, for example, general land communications cannot cover areas where communication devices cannot be installed, such as oceans, mountains, deserts, etc., or communication coverage is not performed due to rarity of population, while for satellite communications, since one satellite can cover a larger ground, and the satellite can orbit around the earth, theoretically every corner on the earth can be covered by satellite communications. And secondly, satellite communication has great social value. Satellite communication can be covered in remote mountain areas, poor and backward countries or regions with lower cost, so that people in the regions enjoy advanced voice communication and mobile internet technology, and the digital gap between developed regions is reduced, and the development of the regions is promoted. Again, the satellite communication distance is far, and the cost of communication is not obviously increased when the communication distance is increased; and finally, the satellite communication has high stability and is not limited by natural disasters.

Communication satellites are classified into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Earth Orbit, geosynchronous Orbit) satellites, HEO (High Elliptical Orbit ) satellites, and the like according to the difference in Orbit heights. LEO and GEO are the main studies at the present stage.

1、LEO

The low orbit satellite has a height ranging from 500km to 1500km and a corresponding orbit period of about 1.5 hours to 2 hours. The signal propagation delay for single hop communications between users is typically less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the user terminal is not high.

2、GEO

Geosynchronous orbit satellites have an orbit height of 35786km and a period of 24 hours around the earth. The signal propagation delay for single hop communications between users is typically 250ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form tens or hundreds of beams to cover the ground; a satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter.

In another example, as shown in fig. 3, a cellular communication network is illustrated in which network device 10 may be a base station 12. Base station 12 is a device deployed in an access network to provide wireless communication functionality for terminal 20. The base stations 12 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. The names of base station-capable devices may vary in systems employing different Radio access technologies, for example in 5G NR (New Radio) systems, called gndeb or gNB. As communication technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices for providing the wireless communication function for the terminal 20 are collectively referred to as a base station.

In addition, the terminal 20 according to the embodiment of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), mobile Station (MS), terminal devices (terminal devices), and so on. For convenience of description, in the embodiment of the present application, the above-mentioned devices are collectively referred to as a terminal.

In addition, in embodiments of the present application, the terms "network" and "system" are generally used in combination, but those skilled in the art will understand the meaning.

The technical scheme described by the embodiment of the application can be applied to an NTN system and a cellular network system.

Taking the NTN system as an example, compared with the cellular communication system, the signal propagation delay between the terminal and the satellite in the NTN system is greatly increased, and there are problems of rapid movement of the satellite, if the existing handover mechanism based on downlink reference signal measurement reporting is directly used in the NTN system, the following problems exist:

1. due to the overlarge transmission time delay and the rapid movement of the satellite, frequent switching processes are required to be executed between the terminal and the network, so that a large amount of switching signaling overhead is caused, and the power consumption and the workload of the terminal are increased. For example, when a terminal is stationary on earth, it is moving at a very high speed relative to the satellite (with reference to the satellite) because the satellite is moving very fast relative to the earth, even though the terminal is stationary relative to the earth.

2. If the existing handover mechanism based on downlink reference signal measurement reporting is used, due to excessive transmission delay and rapid movement of the satellite (i.e. rapid movement of the terminal relative to the satellite), the problem of excessive transmission delay is added on the basis of frequent handover due to further consideration of the long communication distance between the terminal and the satellite, and the phenomenon of frequent handover and the simultaneous large delay in the handover flow easily causes that the handover command to the terminal fails or the terminal has moved out of the cell range, resulting in handover failure or terminal network disconnection, which is a serious problem.

In summary, the above two problems are that the wireless signal transmission delay between the terminal and the satellite is relatively large, and the satellite has a characteristic of fast movement relative to the ground, if the handover is still determined to be executed based on the measurement and reporting of the downlink reference signal, the effectiveness of the satellite in handover judgment is reduced, and the handover performance is affected.

In addition, even in the cellular network system, when the transmission delay between the terminal and the base station is large, or the relative movement speed between the terminal and the base station is large, for example, when the terminal is on a fast moving vehicle or aircraft, if the terminal still determines whether to execute the handover based on the measurement and reporting of the downlink reference signal, the effectiveness of the handover judgment of the base station is also reduced, and the handover performance is also affected.

Based on the above, the embodiment of the application provides a switching control method, a device, equipment and a storage medium. In the technical scheme provided by the embodiment of the application, the uplink mobility is adopted to replace the downlink mobility, that is, the terminal sends an uplink reference signal to the network equipment (such as a satellite or a base station), and the network side comprehensively judges and decides how to serve the terminal according to the received uplink reference signal, for example, whether the network equipment serving the terminal needs to be replaced or not. Thus, on one hand, the reliability of switching and data transmission is ensured, and on the other hand, the time delay of switching and the signaling overhead of an air interface are also reduced.

Specifically, for the scenario of high transmission delay or high mobility described above, when the transmission delay between the terminal and the network device is relatively large, or the relative movement speed between the terminal and the network device is relatively large, if a switching mechanism based on measurement reporting of the downlink reference signal is adopted, because the transmission delay between the terminal and the source network device is relatively large or the relative movement speed is relatively large, the terminal cannot successfully report the measurement result of the downlink reference signal to the source network device, or the measurement result of the downlink reference signal reported by the terminal is failed when being received by the source network device, so that the terminal cannot successfully switch, and normal communication of the terminal is affected. By adopting the technical scheme provided by the embodiment of the application, the uplink reference signal sent by the terminal is measured through the network side, and the switching decision is made based on the measurement result, so that the problem that the network side cannot acquire the measurement result of the uplink reference signal is avoided, and the problem that the network side acquires the invalid measurement result is avoided, thereby ensuring the switching reliability, ensuring that the terminal can smoothly switch from one network device to another network device, ensuring that the network side always has the network device serving the terminal, and further ensuring the reliability of data transmission of the terminal.

On the other hand, based on the switching mechanism of the downlink reference signal measurement report, the network side is required to send the downlink reference signal, the terminal measures the downlink reference signal, and then reports the measurement result to the network side, and under the scene of high transmission delay, the switching delay is larger. By adopting the technical scheme provided by the embodiment of the application, the uplink reference signal sent by the terminal is measured through the network side, so that the step of reporting the measurement result by the terminal is omitted, the time delay of switching is reduced, and the signaling overhead of an air interface is also reduced.

In addition, for the terminal, in a high mobility scenario (e.g. in NTN network), if a handover mechanism based on downlink reference signal measurement reporting is adopted, since a frequent handover scenario is between the terminal and the network device, the frequent handover scenario requires the terminal to measure and report frequently, which not only requires higher air interface signaling, but also causes an increase in power consumption of the terminal and generates electricity consumption problem. By adopting the technical scheme provided by the embodiment of the application, the uplink reference signal sent by the terminal is measured through the network side, so that the terminal is not required to carry out frequent measurement and reporting, and the power consumption and the electric quantity of the terminal are saved.

In the following, the technical solution of the present application will be described in connection with several exemplary embodiments.

Referring to fig. 4, a flowchart of a handover control method according to an embodiment of the present application is shown, and the method may be applied to the network architecture shown in fig. 1 to 3, and the method may include the following steps:

in step 401, the first network device sends first configuration information to the terminal.

The first network device refers to a network device that is currently establishing a connection with the terminal, which may also be referred to as a source network device.

The first configuration information is used to indicate a transmission configuration of the first signal, i.e. to inform the terminal how to transmit the first signal. For example, the first configuration information may be used to indicate a time-frequency location for transmitting the first signal to the terminal, may also be used to indicate to the terminal to periodically or aperiodically transmit the first signal, and the embodiment of the present application is not limited thereto.

Optionally, the first signal belongs to an uplink reference signal. For example, the first signal may be an SRS (Sounding Reference Signal ).

Alternatively, the first signal is a terminal specific (specific) signal, e.g. the first network device may send the first configuration information to the terminal via a dedicated signaling, e.g. the dedicated signaling may be a dedicated RRC (Radio Resource Control ) message.

Optionally, the first network device sends measurement configuration information to the terminal, where the measurement configuration information carries the first configuration information. The measurement configuration information is information for providing measurement configuration, such as uplink measurement configuration and/or downlink measurement configuration, to the terminal, which is not limited by the embodiment of the present application.

Optionally, the first network device may send first configuration information to the terminal when the terminal is initially accessed; alternatively, the first network device may send the first configuration information to the terminal when a certain condition (such as poor signal quality between the first network device and the terminal) is met.

In step 402, the terminal sends a first signal according to the first configuration information.

The terminal transmits a first signal according to the first configuration information after receiving the first configuration information. For example, the terminal uses the time-frequency resource to send the first signal according to the time-frequency resource configured by the first configuration information. Alternatively, the terminal may also determine, based on the first configuration information, whether to periodically transmit the first signal or to non-periodically transmit the first signal, for example, if a certain condition is satisfied.

Optionally, the first network device may further send a first transmission activation instruction to the terminal, where the first transmission activation instruction is used to trigger the terminal to send the first signal. For example, the terminal starts to transmit the first signal after receiving a first transmission activation instruction transmitted by the first network device. Alternatively, the terminal may transmit the first signal according to the first configuration information.

In step 403, the first network device sends measurement indication information to a number a of second network devices, a being a positive integer.

The number of the second network devices may be one or a plurality. The second network device is a network device other than the first network device, i.e. the second network device and the first network device are not the same network device. Optionally, the second network device is a network device adjacent to the first network device, where the adjacent network device may refer to a network device with a distance less than a certain threshold, or may refer to a network device with a signal quality greater than a certain threshold, or may refer to a network device with an adjacent coverage area, which is not limited in the embodiment of the present application. In one example, the first network device may determine the above a second network devices from a list of surrounding network devices according to related information, where the related information may include, but is not limited to, at least one of the following: the ephemeris of the first network device itself, the ephemeris of each network device, the movement track of the terminal, the location information of each network device, and so on. The second network device may also be referred to as a candidate target network device, i.e. if the terminal needs to make a handover, the target network device to which it is handed over may be selected from the a second network devices.

The measurement indication information is used for indicating the a second network devices to measure the first signals sent by the terminal.

Optionally, the measurement instruction information includes: first configuration information; and/or a first measurement activating instruction, where the first measurement activating instruction is used to trigger the a second network devices to activate measurement on the first signal. After the second network device obtains the first configuration information, the second network device can acquire the time-frequency resource occupied by the first signal, and then detect the first signal on the corresponding time-frequency resource, thereby improving the detection efficiency.

Optionally, the measurement indication information includes at least one of: the measurement start time of the first signal, the measurement end time of the first signal, the measurement duration of the first signal, and the measurement period of the first signal. For example, when the measurement start time of the first signal arrives, the second network device starts to detect the first signal, and when the first signal is detected, the reception quality of the first signal is measured. Alternatively, the second network device may start detecting the first signal after receiving the measurement instruction information.

Step 404, the second network device measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, where the first measurement result is used to determine whether to switch the network device connected with the terminal.

The first measurement result refers to a result obtained by the second network device measuring the first signal. The first measurement results obtained may be the same or different for different second network devices. The first measurement result may be a measurement value obtained by the second network device measuring the first signal, such as RSRP (Reference Signal Received Power ), RSRQ (Reference Signal Received Quality, reference signal received quality), SINR (Signal to Interference plus Noise Ratio, signal-to-interference-and-noise ratio), SNR (Signal to Noise Ratio, signal-to-noise ratio), RSSI (Received Signal Strength Indication ), and the like. The first measurement result may also be a result value for characterizing the quality of the radio signal, which is obtained based on the measurement value, e.g. the quality of the radio signal may be divided into two types, i.e. a difference and a preference, and may be represented by 1 bit, e.g. 0 for a difference and 1 for a preference. Of course, the types of wireless signal quality may be divided into more than two types, which are not limited in the embodiment of the present application.

After the second network device measures the first signal sent by the terminal to obtain a first measurement result, the first measurement result may be sent to the first network device, so that the first network device synthesizes the first measurement results sent by the second network devices, and makes a decision on whether the terminal is switched. Alternatively, the second network device may not send the first measurement result to the first network device, and the second network device may make a decision on whether to switch the terminal. For both cases, description will be made below by way of different embodiments.

Because the first measurement result reflects the wireless signal quality between the terminal and the second network device, when the wireless signal quality between the terminal and a certain second network device is better, for example, greater than a certain threshold value or better than the wireless signal quality between the terminal and the first network device, the terminal can be switched from the first network device to the second network device, and the second network device provides service for the terminal, so that the reliability of data transmission of the terminal is ensured.

In summary, in the technical solution provided in the embodiments of the present application, a first signal sent by a terminal is measured by a network side, and a switching decision is made based on a measurement result of the first signal, so that, on one hand, a problem that a network side cannot obtain a measurement result or obtains a measurement result that has failed does not occur in a scenario of high transmission delay or high mobility between the terminal and the network device, thereby ensuring reliability of switching, the terminal can smoothly switch from one network device to another network device, ensuring that the network side always has the network device serving the terminal, and further ensuring reliability of data transmission of the terminal; on the other hand, the first signal sent by the terminal is measured through the network side, so that the step of reporting the measurement result by the terminal is omitted, the time delay of switching is reduced, and the signaling overhead of an air interface is also reduced.

In the above embodiments, it has been described that the decision whether or not the terminal is switched may be made by the first network device (i.e. the source network device) or by the second network device (i.e. the candidate target network device). Next, the two cases will be described by way of two embodiments of fig. 5 and 6, respectively. In the embodiment shown in fig. 5, mainly the first case described above is described, where the first network device (i.e. the source network device) makes a decision on whether or not to switch the terminal; in the embodiment shown in fig. 6, mainly the second scenario described above is described, where the second network device (i.e. the candidate target network device) makes a decision on whether or not to switch the terminal.

Referring to fig. 5, a flowchart of a handover control method according to another embodiment of the present application is shown, and the method may be applied to the network architecture shown in fig. 1 to 3, and the method may include the following steps:

in step 501, the first network device sends first configuration information to the terminal.

Step 502, the terminal sends a first signal according to the first configuration information.

In step 503, the first network device sends measurement indication information to a number a of second network devices, a being a positive integer.

This step 503 may be performed simultaneously with step 501 or after step 501, which is not limited in this embodiment of the present application.

In addition, the steps 501-503 are the same as or similar to the steps 401-403 in the embodiment of fig. 4, and the description of the embodiment of fig. 4 can be specifically referred to, which is not repeated in this embodiment.

In step 504, the first network device measures the first signal to obtain a second measurement result.

The second measurement result refers to a result obtained by the first network device measuring the first signal. The second measurement may be a measurement, such as RSRP, RSRQ, SINR, SNR, RSSI, of the first signal measured by the first network device. The second measurement result may also be a result value for characterizing the quality of the radio signal, which is obtained based on the measurement value, and may be represented by 2 bits, e.g. 00 for the difference, 01 for the general, and 10 for the preference, if the quality of the radio signal may be classified into 3 types of difference, general, and preferred.

In step 505, the second network device measures the first signal according to the measurement indication information to obtain a first measurement result.

The step 505 is the same as or similar to the step 404 in the embodiment of fig. 4, and the description of the embodiment of fig. 4 is specifically referred to, which is not repeated in this embodiment.

The second network device sends 506 the first measurement result to the first network device.

The second network device may send the first measurement result to the first network device, so that the first network device synthesizes the first measurement results sent by the respective second network devices, and makes a decision on whether the terminal is switched.

Accordingly, the first network device receives the first measurement result sent by b second network devices in the a second network devices, where b is a positive integer less than or equal to a. That is, after the first network device sends the measurement indication information to the a second network devices, the first network device may receive the first measurement results fed back by all the a second network devices, and may also receive the first measurement results fed back by some of the a second network devices.

In step 507, when the second measurement result meets the first condition, and the first measurement result sent by the target second network device meets the second condition, the first network device sends a handover request message to the target second network device.

The handover request message is for requesting handover of the terminal to the target second network device. The target second network device may be a second network device of the b second network devices.

The target second network device is selected from the b second network devices by the first network device, for example, the first network device selects to send the handover request message to the second network device whose first measurement result satisfies the second condition. In addition, the number of target second network devices may be one or more, that is, the first network device may send a handover request message to only one target second network device, or may send a handover request message to a plurality of target second network devices.

The first condition and the second condition refer to a preset condition for deciding to switch, or a condition for negotiating and determining to switch between network devices, or a condition for determining to switch between at least some of the related network devices (such as a source network device). When the second measurement result meets the first condition, the wireless signal quality between the terminal and the first network device is poor, and the terminal can be switched to another network device with better quality. When the first measurement result sent by a certain second network device meets the second condition, the wireless signal quality between the terminal and the second network device is better, and the terminal can be switched to the second network device to provide better service for the terminal.

Optionally, the first condition includes, but is not limited to, any one of:

(1) The second measurement is less than or equal to the first threshold;

(2) The second measurement result is continuously smaller than or equal to the first threshold value for N times;

(3) The duration of the second measurement result being less than or equal to the first threshold value being greater than or equal to the first duration; the method comprises the steps of,

(4) The duration of the second measurement result which is continuously N times smaller than or equal to the first threshold value is longer than or equal to the first duration;

wherein N is a positive integer. In addition, the first threshold value refers to a threshold value related to the measurement result, and the first duration refers to a threshold value related to the duration.

The first network device may perform at least one measurement on the first signal sent by the terminal, to obtain at least one measurement result. The first condition may be preset according to the requirement, which is not limited in the embodiment of the present application.

Optionally, the second condition includes, but is not limited to, any of the following:

(1) The first measurement result is greater than or equal to a second threshold value;

(2) The first measurement result is greater than or equal to a second threshold value for M consecutive times;

(3) The duration of the first measurement result being greater than or equal to the second threshold value is greater than or equal to the second duration; the method comprises the steps of,

(4) The duration of the first measurement result for M consecutive times greater than or equal to the second threshold value is greater than or equal to the second duration;

wherein M is a positive integer. The second threshold value refers to a threshold value related to the measurement result, and the second duration refers to a threshold value related to the duration.

Each second network device may also perform at least one measurement on the first signal sent by the terminal, to obtain at least one measurement result. The second condition may be preset according to the requirement, which is not limited in the embodiment of the present application.

It should be noted that, in some possible embodiments, the first network device may also make a decision on whether to switch the terminal based on only the first measurement result, that is, the second measurement result of the first network device may not be considered when making the switch decision. For example, when the first measurement result sent by the target second network device satisfies the second condition, the first network device sends a handover request message to the target second network device. In this case, the first network device may further pay attention to the continuity of the handover, so as to ensure that the terminal may switch to a suitable cell to the greatest extent, or may not perform measurement for the first signal, or reduce the measurement duration of the first signal by the first network device as much as possible, and reduce the processing overhead of the first network device.

In step 508, the first network device receives the handover confirm message sent by the target second network device.

After receiving the handover request message sent by the first network device, the target second network device decides whether to allow the terminal to be handed over to the target second network device, and if the terminal is allowed to be handed over to the target second network device, the target second network device may send a handover confirmation message to the first network device, where the handover confirmation message is used to instruct to confirm that the terminal is handed over to the target second network device. The handover confirm message may also be referred to as a handover request acknowledge message.

After receiving the handover confirmation message sent by a certain target second network device, the first network device can learn that the target second network device allows the terminal to be handed over, and at this time, the first network device can decide to handover the terminal from the first network device to the target second network device.

In addition, considering that the first network device may receive the handover confirm message sent by the plurality of target second network devices, that is, there are a plurality of target second network devices allowing the terminal to perform handover, the first network device may select one target second network device determined to be the terminal to be handed over from the plurality of target second network devices sending the handover confirm message. For example, the first network device may select a target second network device corresponding to the handover confirmation message received first, as the target second network device to which the terminal is handed over; for another example, the first network device may select the target second network device with the best wireless signal quality with the terminal, as the target second network device to which the terminal is switched, or may select the target second network device to which the terminal is switched in other manners, which is not limited in the embodiment of the present application.

Optionally, after the first network device selects one target second network device from the plurality of target second network devices that send the handover confirmation message as the target second network device to which the terminal is handed over, the first network device may send a handover cancel instruction to the other unselected target second network devices, where the handover cancel instruction is used to instruct cancellation of handover of the terminal to the other unselected target second network devices.

Step 509, after determining to switch the terminal to the target second network device, the first network device sends a switch command to the terminal.

The handover command is used to instruct the terminal to handover from the first network device to the target second network device. After receiving the handover command, the terminal may execute a handover procedure for handover from the first network device to the target second network device. Optionally, after receiving the handover command, the terminal may initiate a connection establishment request (e.g. a random access request) to the target second network device, requesting to establish a connection with the target second network device. After the terminal successfully establishes a connection with the target second network device, data transmission can be performed between the terminal and the target second network device through the connection.

Optionally, the handover command is a HO command message.

Optionally, the handover command includes, but is not limited to, at least one of the following information: resources for RACH (Random Access Channel ), C-RNTI (Cell-Radio Network Temporary Identifier, cell radio network temporary identity), security algorithms for the target second network device, system messages for the target second network device, etc.

It should be noted that the target second network device in this step refers to one target second network device selected by the first network device in the manner described in step 508 above.

In addition, the timing of the first network device sending the measurement indication information may include the following two cases:

1. the configuration is sent. That is, the first network device transmits measurement indication information to the at least one second network device whenever the first network device configures the terminal to transmit the first signal, such as transmitting first configuration information to the terminal.

2. And (5) sending again after meeting the condition. That is, the first network device transmits measurement instruction information to at least one second network device only if a certain condition is satisfied. For example, the first network device measures the first signal to obtain a second measurement result, and when the second measurement result meets a fourth condition, the first network device sends measurement indication information to the a second network devices.

Optionally, the fourth condition includes, but is not limited to, any one of:

(1) The second measurement is less than or equal to a fourth threshold value;

(2) The second measurement result is smaller than or equal to a fourth threshold value for P times continuously;

(3) The duration of the second measurement less than or equal to the fourth threshold value is greater than or equal to the fourth duration; the method comprises the steps of,

(4) The duration of the second measurement result P consecutive times less than or equal to the fourth threshold value is greater than or equal to the fourth duration;

wherein P is a positive integer. The fourth threshold value refers to a threshold value related to the measurement result, and the fourth period of time refers to a threshold value related to the period of time.

That is, when the first network device detects that the wireless signal quality between the first network device and the terminal is poor, the first network device sends measurement indication information to the second network device, and seeks to switch the terminal to the network device with better wireless signal quality.

In an exemplary embodiment, the second network device may further send the first measurement result to the first network device after receiving the measurement feedback instruction sent by the first network device. For example, the first network device measures the first signal to obtain a second measurement result, and when the second measurement result meets a third condition, the first network device sends a measurement feedback instruction to the second network device, where the measurement feedback instruction is used to instruct the a second network devices to send the first measurement result to the first network device. Optionally, the third condition includes, but is not limited to, any one of:

(1) The second measurement is less than or equal to a third threshold value;

(2) The second measurement result is continuously Q times smaller than or equal to a third threshold value;

(3) The duration of the second measurement result being less than or equal to the third threshold value being greater than or equal to the third duration; the method comprises the steps of,

(4) The duration of the second measurement result continuously Q times smaller than or equal to the third threshold value is longer than or equal to the third duration;

wherein Q is a positive integer. In addition, the third threshold refers to a threshold related to the measurement result, and the third duration refers to a threshold related to the duration.

That is, when the first network device detects that the wireless signal quality between the first network device and the terminal is poor, the first network device requests the second network device to acquire the first measurement result, and seeks to switch the terminal to the network device with better wireless signal quality.

In an exemplary embodiment, the second network device sending the first measurement result to the first network device may include the following scenarios:

1. and each time the second network equipment acquires the first measurement result, the first measurement result is sent to the first network equipment.

That is, the second network device sends the last acquired first measurement result to the first network device in real time.

2. The second network device processes (e.g., averages) the first measurement result obtained in a period of time to obtain a processed first measurement result, and then sends the processed first measurement result to the first network device.

3. And the second network equipment sends the first measurement result to the first network equipment when the first measurement result meets the fifth condition.

Optionally, the fifth condition includes, but is not limited to, any one of the following:

(1) The first measurement is greater than or equal to a fifth threshold;

(2) The first measurement result is continuously R times larger than or equal to a fifth threshold value;

(3) The duration of the first measurement result being greater than or equal to the fifth threshold value is greater than or equal to the fifth duration; the method comprises the steps of,

(4) The duration of the first measurement result for R consecutive times greater than or equal to the fifth threshold value is greater than or equal to the fifth duration;

wherein R is a positive integer. In addition, the fifth threshold refers to a threshold related to the measurement result, and the fifth duration refers to a threshold related to the duration.

That is, when the second network device detects that the wireless signal quality between the second network device and the terminal is superior, the second network device actively transmits the first measurement result to the first network device, and when the second network device detects that the wireless signal quality between the second network device and the terminal is not superior, the second network device may not transmit the first measurement result to the first network device, thereby saving signaling overhead.

4. And the second network equipment sends the first measurement result to the first network equipment after receiving the measurement feedback instruction sent by the first network equipment.

5. And the second network equipment sends the first measurement result to the first network equipment after receiving the measurement feedback instruction sent by the first network equipment and when the first measurement result meets the sixth condition.

Optionally, the sixth condition includes, but is not limited to, any one of:

(1) The first measurement is greater than or equal to a sixth threshold;

(2) The first measurement result is continuously larger than or equal to a sixth threshold value for U times;

(3) The duration of the first measurement result being greater than or equal to the sixth threshold value is greater than or equal to the sixth duration; the method comprises the steps of,

(4) The duration of the first measurement result for U times greater than or equal to the sixth threshold value is greater than or equal to six times;

wherein U is a positive integer. In addition, the sixth threshold is a threshold related to the measurement result, and the sixth duration is a threshold related to the duration.

Optionally, after receiving the measurement feedback instruction, the second network device may send the first measurement result obtained last time to the first network device, or may send the first measurement result obtained in a period of time to the first network device, or send the processed first measurement result (obtained by processing the first measurement result obtained in a period of time) to the first network device. For example, the period of time may be all or part of the period of time from when the second network device starts measuring the first signal to when the measurement feedback instruction is received.

In summary, in this embodiment, it is achieved that the first network device (i.e. the source network device) makes a decision on whether to switch the terminal.

Referring to fig. 6, a flowchart of a handover control method according to another embodiment of the present application is shown, and the method may be applied to the network architecture shown in fig. 1 to 3, and the method may include the following steps:

in step 601, the first network device sends first configuration information to the terminal.

In step 602, the terminal sends a first signal according to the first configuration information.

In step 603, the first network device sends measurement indication information to a number a of second network devices, a being a positive integer.

This step 603 may be performed simultaneously with the step 601, or may be performed after the step 601, which is not limited in this embodiment of the present application.

In addition, the steps 601-603 are the same as or similar to the steps 401-403 in the embodiment of fig. 4, and the description of the embodiment of fig. 4 is specifically referred to, which is not repeated herein.

In step 604, the first network device measures the first signal to obtain a second measurement result.

The second measurement result refers to a result obtained by the first network device measuring the first signal. The second measurement may be a measurement, such as RSRP, RSRQ, SINR, SNR, RSSI, of the first signal measured by the first network device. The second measurement result may also be a result value for characterizing the quality of the wireless signal, which is obtained based on the measurement value, and may be represented by 2 bits, for example, 00 represents a difference, 01 represents a general good, and 11 represents a good, if the quality of the wireless signal may be classified into 4 types of difference, general good, and excellent.

Step 605, the second network device measures the first signal according to the measurement indication information to obtain a first measurement result.

The step 605 is the same as or similar to the step 404 in the embodiment of fig. 4, and the description of the embodiment of fig. 4 is specifically referred to, which is not repeated in this embodiment.

Step 606, the first network device sends the second measurement result to the a second network devices.

And the first network equipment sends the second measurement result to the second network equipment so that the second network equipment synthesizes the received second measurement result and the first measurement result acquired by the second network equipment, and decides whether the terminal is switched or not.

Optionally, when the first network device receives the measurement result acquisition request sent by the second network device, the first network device sends the second measurement result to the second network device. When the first measurement result satisfies the seventh condition, the second network device transmits a measurement result acquisition request for requesting acquisition of the second measurement result to the first network device.

Optionally, the seventh condition includes, but is not limited to, any one of the following:

(1) The first measurement is greater than or equal to a seventh threshold;

(2) The first measurement result is continuously greater than or equal to a seventh threshold value for S times;

(3) The duration of the first measurement result being greater than or equal to the seventh threshold value is greater than or equal to the seventh duration; the method comprises the steps of,

(4) The duration of the first measurement result for S consecutive times greater than or equal to the seventh threshold value is greater than or equal to the seventh duration;

wherein S is a positive integer. In addition, the seventh threshold value refers to a threshold value related to the measurement result, and the seventh duration refers to a threshold value related to the duration.

That is, when the second network device detects that the wireless signal quality between the second network device and the terminal is better, the second network device requests the first network device to acquire the second measurement result, so as to determine whether the terminal needs to perform handover or not, and provide better service for the terminal. When the second network device detects that the wireless signal quality between the second network device and the terminal is not excellent, the second network device can not request the first network device to acquire the second measurement result, and correspondingly, the first network device does not need to send the second measurement result to the second network device, so that signaling overhead is saved.

Optionally, when the second measurement result satisfies the eighth condition, the first network device sends the second measurement result to the second network device.

Optionally, the eighth condition includes, but is not limited to, any one of the following:

(1) The second measurement is less than or equal to an eighth threshold value;

(2) The second measurement result is continuously smaller than or equal to an eighth threshold value for T times;

(3) The duration of the second measurement less than or equal to the eighth threshold value is greater than or equal to the eighth duration; the method comprises the steps of,

(4) The duration of the second measurement result which is continuously T times less than or equal to the eighth threshold value is longer than or equal to the eighth duration;

wherein T is a positive integer. In addition, the eighth threshold value refers to a threshold value related to the measurement result, and the eighth duration refers to a threshold value related to the duration.

That is, when the first network device detects that the wireless signal quality between the first network device and the terminal is poor, the first network device actively sends a second measurement result to the second network device, so as to trigger the second network device to make a switching decision, and seek to switch the terminal to the network device with better wireless signal quality.

Optionally, the first network device sends the second measurement result to the second network device at or after the second network device starts to perform the measurement on the first signal. Of course, in some other embodiments, the first network device may also send the second measurement result to the second network device each time the second measurement result is obtained, or at intervals. Alternatively, the second measurement result sent by the first network device to the second network device may be the second measurement result obtained last time, or may be the second measurement result obtained in a period of time, which is not limited in the embodiment of the present application.

In step 607, when the second measurement result meets the first condition and the first measurement result meets the second condition, the second network device sends handover indication information to the first network device.

The handover indication information is used for indicating to handover the terminal to the second network device. For descriptions of the first condition and the second condition, reference may be made to the embodiment of fig. 5, and this embodiment will not be repeated.

It should be noted that, in some possible embodiments, the second network device may also make a decision on whether to switch the terminal based on the first measurement result only, that is, the second measurement result of the first network device may not be considered when making the switch decision. For example, when the first measurement result satisfies the second condition, the second network device transmits handover instruction information to the first network device. In this case, the first network device may perform measurement on the first signal, or may not need to send the second measurement result to the second network device, so as to reduce processing overhead of the first network device.

After determining to switch the terminal to the target second network device, the first network device sends a switch command to the terminal, step 608.

Optionally, the handover command is a HO command message.

Optionally, the handover command includes, but is not limited to, at least one of the following information: resources for RACH, C-RNTI, security algorithms for target second network device, system messages for target second network device, etc.

After receiving the switching indication information sent by a certain second network device, the first network device can learn that the second network device allows the terminal to switch, and at this time, the first network device can decide to switch the terminal from the first network device to the second network device.

In addition, considering that the first network device may receive the handover indication information transmitted by the plurality of second network devices, that is, that there are a plurality of second network devices allowing the terminal to perform handover, the first network device may select one second network device from the plurality of second network devices transmitting the handover indication information as the target second network device. For example, the first network device may select, as the target second network device, the second network device corresponding to the handover instruction information received first; for another example, the first network device may select a second network device with the best wireless signal quality with the terminal as the target second network device, or may select the target second network device in other manners, which is not limited by the embodiment of the present application.

Alternatively, when the first network device selects one second network device as a target second network device from the plurality of second network devices that transmit the handover instruction information, the first network device may transmit a handover cancel instruction for instructing to cancel handover of the terminal to the other second network device. The other second network devices are second network devices except the selected target second network device among the plurality of second network devices transmitting the handover instruction information.

In summary, in the present embodiment, the decision whether the second network device (i.e., the candidate target network device) switches the terminal is implemented, and compared with the scheme that the first network device (i.e., the source network device) makes the decision whether the terminal switches the terminal, the scheme provided in the present embodiment helps to save the interaction waiting time of the first measurement result, and further reduces the time delay of switching.

In several embodiments described above, after determining to switch the terminal to the target second network device, the first network device may send a switch command (e.g., a HO command message) to the terminal, which explicitly indicates to the terminal to switch from the first network device to the target second network device.

In an exemplary embodiment, after determining to switch the terminal to the target second network device, the first network device may also not send a switch command (such as an HO command message) to the terminal, and the network side switches the first network device serving the terminal to the target second network device through interaction between the first network device and the target second network device, so as to implement non-aware switching of the terminal.

Optionally, after receiving the handover confirmation message sent by the target second network device, the first network device is configured to instruct to confirm that the terminal is handed over to the target second network device, and if the target second network device is confirmed to meet the specified condition, the first network device does not send a handover command to the terminal, so as to complete handover of the terminal from the first network device to the target second network device. That is, when the terminal is handed over from the cell of the first network device to the cell of the target second network device, the terminal does not need to adjust the configuration, and does not need to initiate a connection establishment request to the target second network device, that is, data transmission can be directly performed with the target second network device.

Optionally, the above specified conditions include, but are not limited to, at least one of:

1. the cell of the target second network device and the cell of the first network device belong to the same cell group and meet the first characteristic;

one cell group may include one or more cells, and when the cell of the target second network device and the cell of the first network device belong to the same cell group and satisfy the first characteristic, it is indicated that the configurations of the two cells may be the same or similar, in which case the terminal may be directly handed over from the cell of the first network device to the cell of the target second network device without informing the terminal (i.e. without sending a handover command to the terminal).

Illustratively, the first feature includes, but is not limited to, at least one of:

(1) The cell of the target second network device and the cell of the first network device share the same PCI (Physical Cell Identifier, physical cell identity), and the beam (beam) configuration of the cell of the target second network device and the cell of the first network device are different;

(2) The cell of the target second network device and the cell of the first network device share the same virtual PCI, and the terminal uses the virtual PCI to perform operations such as scrambling and decoding when communicating with the target second network device and the first network device;

(3) The cell of the target second network device and the cell of the first network device share wireless resources; for example, the cell of the target second network device and the cell of the first network device are allocated to use the same radio resources;

(4) And the Time Advance (TA) corresponding to the cell of the target second network device and/or the time advance corresponding to the cell of the first network device meet the conditions. For example, the target second network device and the first network device belong to the same TAG (Timing advance group), or the TA of the cell of the target second network device is 0, or the TA difference between the terminal and the first network device and/or the target second network device is smaller than a threshold value, or the target second network device may acquire the TA of the first network device, or the target second network device may perform TA adjustment based on the TA of the first network device, or the like.

When the cell of the target second network device and the cell of the first network device meet the first characteristic, the configuration of the two cells may be the same or similar, so that it is not necessary to send an air interface handover command to the terminal to provide relevant information of the cell of the target second network device (such as information of a security algorithm of the target second network device and a system message of the target second network device) to the terminal, the terminal may communicate with the target second network device without changing the relevant configuration, and the terminal may directly follow the configuration when accessing the first network device, thereby implementing the handover without perception of the terminal. In this case, the terminal, although actually switching from the first network device to the target second network device, is considered to be in communication with the same network device from the point of view of the terminal.

2. The switching confirmation message sent by the target second network equipment does not carry resource allocation information, and the resource allocation information is used for indicating resources allocated by the target second network equipment for the terminal;

if the switching confirmation message sent by the target second network device does not carry the resource allocation information, the target second network device can implicitly inform the first network device in this way, and the terminal can be switched from the first network device to the target second network device without sending an air interface switching command to the terminal.

3. The handover confirmation message sent by the target second network device indicates that the resource configuration provided by the target second network device for the terminal is the same as the resource configuration provided by the first network device for the terminal. That is, the handover confirm message sent by the target second network device indicates that the resource configuration provided by the target second network device for the terminal is unchanged from the resource configuration provided by the first network device for the terminal.

The target second network device can inform the first network device in such a way that the terminal can be switched from the first network device to the target second network device without sending an air interface switching command to the terminal.

Of course, the target second network device may also inform the first network device in other manners, and need not send the handover command to the terminal, which is not limited by the embodiment of the present application. In addition, the target second network device may detect whether the cell of the target second network device and the cell of the first network device belong to the same cell group and satisfy the first characteristic, and if the target second network device detects that the cell of the target second network device and the cell of the first network device belong to the same cell group and satisfy the first characteristic, the target second network device may inform the first network device in the manner described above when sending the handover confirm message to the first network device, without sending a handover command to the terminal.

In addition, the terminal may select a beam for transmission with a cell of the target second network device based on a beam failure recovery (beam failure recovery) procedure.

In addition, the same security key may be used when communicating with the terminal in a cell belonging to the same cell group. For example, when the cell of the target second network device and the cell of the first network device belong to the same cell group, the security key used when the target second network device communicates with the terminal and the security key used when the first network device communicates with the terminal may be the same.

Referring to fig. 7 in combination, taking an example of deciding whether a terminal is handed over by a first network device (i.e., a source network device), the handover of the terminal from the first network device to a target second network device is completed without sending a handover command, the process may include the following steps:

in step 701, the first network device sends first configuration information to a terminal.

In step 702, the terminal sends a first signal according to the first configuration information.

In step 703, the first network device sends measurement indication information to a number a of second network devices, a being a positive integer.

In step 704, the first network device measures the first signal to obtain a second measurement result.

Step 705, the second network device measures the first signal according to the measurement indication information to obtain a first measurement result.

The second network device sends 706 the first measurement result to the first network device.

In step 707, when the second measurement result meets the first condition, and the first measurement result sent by the target second network device meets the second condition, the first network device sends a handover request message to the target second network device. Optionally, the second network device that meets the specified condition is preferentially selected, and a handover request message is sent.

In step 708, the first network device receives a handover confirm message sent by the target second network device.

In step 709, the first network device releases the context information of the terminal in case it is determined to switch the terminal to the target second network device and it is confirmed that the target second network device meets the specified condition. In this case, the first network device does not send a handover command to the terminal, enabling a handover without awareness of the terminal.

And step 710, data transmission is performed between the terminal and the target second network equipment.

Of course, in other examples, in a case where the second network device (i.e., the candidate target network device) makes a decision on whether to switch the terminal, the switching of the terminal from the first network device to the target second network device may also be completed without sending a switching command.

It should be noted that, if the first network device receives the handover confirm message sent by the plurality of second network devices, the first network device may preferably select, as the target second network device, a second network device that belongs to the same cell group with the first network device itself, or may also select, as the target second network device, a second network device with the best channel quality, or may also select, as the target second network device, a second network device capable of supporting a specific service of the terminal (such as a high priority service, GBR (Guaranteed Bit Rate, guaranteed bit rate) service, etc.). And under the condition that the selected target second network equipment meets the specified conditions, the first network equipment does not need to send a switching command to the terminal, so that the terminal is switched without perception.

Optionally, after determining to switch the terminal to the target second network device, the first network device may further send a switch notification to the target second network device, where the switch notification is used to inform the target second network device to provide services for the terminal, for example, to send and receive data related to the terminal. Of course, in other examples, the first network device may not send the handover notification to the target second network device, which is not limited by the embodiment of the present application.

In summary, in this embodiment, the network side does not need to send a handover command to the terminal, so as to implement handover to the serving cell of the terminal, implement handover without perception by the terminal, and help to save signaling overhead.

For the switching scheme based on the downlink reference signal measurement report, the network side can also realize the switching of the service cell of the terminal under the condition that the switching command is not sent to the terminal. As shown in fig. 8, the method may include the following steps:

in step 801, the terminal sends a measurement result of a downlink reference signal to the first network device.

In this embodiment, the first network device also refers to a network device that currently establishes a connection with a terminal, and the first network device may also be referred to as a source network device.

The terminal can measure the downlink reference signal issued by the network side according to the configuration of the network side (such as the first network device) to obtain a corresponding measurement result. And when the terminal meets the measurement report condition, the terminal sends a measurement result to the first network equipment.

The measurement result of the downlink reference signal may be a measurement value obtained by the terminal measuring the downlink reference signal, for example RSRP, RSRQ, SINR, SNR, RSSI. The measurement result of the downlink reference signal may also be a result value for characterizing the quality of the wireless signal, which is obtained based on the measurement value, for example, the quality of the wireless signal may be classified into two types, namely, difference and best, and the result value may be represented by 1 bit, for example, 0 represents difference and 1 represents best. Of course, the types of wireless signal quality may be divided into more than two types, which are not limited in the embodiment of the present application.

Step 802, the first network device sends a handover request message to at least one second network device according to the measurement result.

In this embodiment, the second network device also refers to a candidate target network device, and the number of the second network devices may be one or more. For example, the first network device may select, as the second network device, a network device with better wireless signal quality with the terminal according to the measurement result reported by the terminal.

The handover request message is for requesting handover of the terminal to the at least one second network device.

Optionally, the cell of the second network device and the cell of the first network device belong to the same cell group. That is, the first network device determines whether the cell of the second network device and the cell of the first network device belong to the same cell group before sending the handover request message to the second network device; if the network device belongs to the same cell group, the first network device sends or preferentially sends a switching request message to the second network device; otherwise, the first network device does not send a handover request message to the second network device, or reduces the priority of sending a handover request message to the second network device.

Step 803, the first network device receives a handover confirmation message sent by a target second network device of the at least one second network device.

The target second network device is one of the at least one second network device.

The second network device determines whether to allow the terminal to be switched to the second network device after receiving the switching request message sent by the first network device, and if the terminal is allowed to be switched to the second network device, the second network device may send a switching confirmation message to the first network device, where the switching confirmation message is used to instruct to confirm that the terminal is switched to the second network device. The handover confirm message may also be referred to as a handover request acknowledge message.

After receiving the switching confirmation message sent by a certain second network device, the first network device can learn that the second network device allows the terminal to switch, and at this time, the first network device can decide to switch the terminal from the first network device to the second network device.

In this embodiment, when the target second network device meets the specified condition, the first network device does not need to send a handover command to the terminal, and the terminal is handed over from the first network device to the target second network device. That is, when the terminal is handed over from the cell of the first network device to the cell of the target second network device, the terminal does not need to adjust the configuration, and does not need to initiate a connection establishment request to the target second network device, that is, data transmission can be directly performed with the target second network device.

Optionally, the specified condition includes at least one of:

(1) The cell of the target second network device and the cell of the first network device share the same PCI, and the beam configurations of the cell of the target second network device and the cell of the first network device are different;

(4) The time advance corresponding to the cell of the target second network device and/or the time advance corresponding to the cell of the first network device satisfies the condition. For example, the target second network device and the first network device belong to the same TAG, or the TA of the serving cell of the target second network device is 0, or the TA difference between the terminal and the first network device and/or the target second network device is smaller than a threshold value, or the target second network device may acquire the TA of the first network device, or the target second network device may perform TA adjustment based on the TA of the first network device, or the like.

In step 804, the first network device releases the context information of the terminal when determining to switch the terminal to the target second network device and when confirming that the target second network device meets the specified condition. In this case, the first network device does not send a handover command to the terminal, enabling a handover without awareness of the terminal.

And step 805, data transmission is performed between the terminal and the target second network device.

It should be noted that, if the first network device receives the handover confirm message sent by the at least two second network devices, the first network device selects one second network device from the at least two second network devices as the target second network device.

For example, the target second network device may be a second network device belonging to the same cell group as the cell of the first network device, or the target second network device may be a second network device with the optimal channel quality in the cell, or the target second network device may be a second network device capable of supporting a specific service (such as a high priority service, GBR service, etc.) of the terminal. And under the condition that the selected target second network equipment meets the specified conditions, the first network equipment does not need to send a switching command to the terminal, so that the terminal is switched without perception.

In addition, if the target second network device selected by the first network device does not meet the specified condition, the first network device sends a handover command (e.g., HO command message) to the terminal, and triggers the terminal to initiate a connection establishment request (e.g., random access request) to the target second network device, so as to request to establish a connection with the target second network device.

In summary, in this embodiment, for the handover scheme based on the downlink reference signal measurement report, the network side may also implement handover to the serving cell of the terminal without sending a handover command to the terminal, so as to implement handover without perception by the terminal, and help to save signaling overhead.

In the embodiment of the method, the technical scheme of the application is mainly described from the aspect of interaction among the first network device, the second network device and the terminal. The steps executed by the first network device may be implemented separately as a handover control method on the first network device side; the steps executed by the second network device may be implemented separately as a handover control method on the second network device side; the steps performed by the terminal may be implemented as a handover control method on the terminal side.

The following are examples of the apparatus of the present application that may be used to perform the method embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the method of the present application.

Referring to fig. 9, a block diagram of a handover control apparatus according to an embodiment of the present application is shown. The device has the function of realizing the method example of the first network equipment side, and the function can be realized by hardware or can be realized by executing corresponding software by hardware. The apparatus may be the first network device described above, or may be provided in the first network device. As shown in fig. 9, the apparatus 900 may include: configuration information sending module 910 and measurement indication sending module 920

The configuration information sending module 910 is configured to send first configuration information to the terminal, where the first configuration information is used to indicate a sending configuration of the first signal.

The measurement indication sending module 920 is configured to send measurement indication information to a second network devices, where the measurement indication information is used to instruct the a second network devices to measure the first signal sent by the terminal, and obtain a first measurement result, where the first measurement result is used to determine whether to switch the network device connected to the terminal, and a is a positive integer.

In an exemplary embodiment, the first signal belongs to an uplink reference signal.

In an exemplary embodiment, the measurement indication information includes: the first configuration information; and/or a first measurement activation instruction, where the first measurement activation instruction is used to trigger the a second network devices to activate measurement on the first signal.

In an exemplary embodiment, the measurement indication information includes at least one of: a measurement start time of the first signal, a measurement end time of the first signal, a measurement duration of the first signal, and a measurement period of the first signal.

In an exemplary embodiment, the apparatus 900 further comprises:

the uplink signal measurement module is used for measuring the first signal to obtain a second measurement result;

a measurement result receiving module, configured to receive the first measurement result sent by b second network devices in the a second network devices, where b is a positive integer less than or equal to a;

and the switching request sending module is used for sending a switching request message to the target second network equipment when the second measurement result meets a first condition and the first measurement result sent by the target second network equipment in the b second network equipment meets a second condition or when the first measurement result sent by the target second network equipment meets the second condition, wherein the switching request message is used for requesting to switch the terminal to the target second network equipment.

In an exemplary embodiment, the first condition includes any one of: the second measurement result is smaller than or equal to a first threshold value; the second measurement result is continuously smaller than or equal to the first threshold value for N times; the duration of the second measurement result being less than or equal to the first threshold value is greater than or equal to a first duration; and the second measurement is continuously performed for N times with the duration less than or equal to the first threshold value being longer than or equal to the first duration; wherein N is a positive integer.

In an exemplary embodiment, the second condition includes any one of: the first measurement result is greater than or equal to a second threshold value; the first measurement result is greater than or equal to the second threshold value for M continuous times; the duration of the first measurement result being greater than or equal to the second threshold value is greater than or equal to a second duration; and, the first measurement is greater than or equal to the second duration for a duration greater than or equal to the second threshold for M consecutive times; wherein M is a positive integer.

In an exemplary embodiment, the apparatus 900 further comprises: and the feedback instruction sending module is used for sending a measurement feedback instruction to the a second network devices when the second measurement result meets a third condition, wherein the measurement feedback instruction is used for indicating the a second network devices to send the first measurement result to the first network device.

In an exemplary embodiment, the apparatus 900 further comprises: the indication information receiving module is used for receiving switching indication information sent by b second network devices in the a second network devices, the switching indication information sent by a target second network device in the b second network devices is used for indicating the terminal to be switched to the target second network device, and b is a positive integer smaller than or equal to a.

In an exemplary embodiment, the apparatus 900 further comprises:

and the measurement result sending module is used for sending the second measurement results to the a second network devices.

In an exemplary embodiment, the apparatus 900 further comprises: and the measurement indication sending module is used for sending the measurement indication information to the a second network devices when the second measurement result obtained by the first network device for measuring the first signal meets a fourth condition.

In an exemplary embodiment, the apparatus 900 further comprises: and the switching command sending module is used for sending a switching command to the terminal, wherein the switching command is used for indicating the terminal to switch from the first network equipment to the target second network equipment in the a second network equipment.

In an exemplary embodiment, the apparatus 900 further comprises:

a confirmation message receiving module, configured to receive a handover confirmation message sent by a target second network device of the a second network devices, where the handover confirmation message is used to confirm handover of the terminal to the target second network device;

In an exemplary embodiment, the specified condition includes at least one of:

the cell of the target second network device and the cell of the first network device belong to the same cell group and satisfy a first characteristic;

the switching confirmation message does not carry resource allocation information, and the resource allocation information is used for indicating resources allocated by the target second network equipment for the terminal; the method comprises the steps of,

the handover confirmation message indicates that the resource configuration provided by the target second network device for the terminal is the same as the resource configuration provided by the first network device for the terminal.

In an exemplary embodiment, the first feature includes at least one of:

the cell of the target second network device and the cell of the first network device share the same physical cell identifier PCI, and the beam configurations of the cell of the target second network device and the cell of the first network device are different;

The cell of the target second network device and the cell of the first network device share the same virtual PCI, and the terminal uses the virtual PCI to scramble and decode when communicating with the target second network device and the first network device;

the cell of the target second network device and the cell of the first network device share wireless resources; the method comprises the steps of,

and the time advance corresponding to the cell of the target second network device and/or the time advance corresponding to the cell of the first network device meet the conditions.

Referring to fig. 10, a block diagram of a handover control apparatus according to another embodiment of the present application is shown. The device has the function of realizing the method example of the second network equipment side, and the function can be realized by hardware or can be realized by executing corresponding software by hardware. The apparatus may be the second network device described above, or may be provided in the second network device. As shown in fig. 10, the apparatus 1000 may include: a measurement indication receiving module 1010 and an uplink signal measuring module 1020.

And a measurement instruction receiving module 1010, configured to receive measurement instruction information sent by the first network device.

And the uplink signal measurement module 1020 is configured to measure, according to the measurement indication information, a first signal sent by a terminal to obtain a first measurement result, where the first measurement result is used to determine whether to switch a network device connected to the terminal.

In an exemplary embodiment, the apparatus 1000 further comprises: and the measurement receiving and transmitting module is used for transmitting the first measurement result to the first network equipment.

In an exemplary embodiment, the measurement receiving and transmitting module is configured to: each time the first measurement result is obtained, the first measurement result is sent to the first network equipment; or processing the first measurement result obtained in a period of time to obtain a processed first measurement result, and sending the processed first measurement result to the first network device; or when the first measurement result meets a fifth condition, sending the first measurement result to the first network device; or after receiving a measurement feedback instruction sent by the first network device, sending the first measurement result to the first network device; or after receiving a measurement feedback instruction sent by the first network device, and when the first measurement result meets a sixth condition, sending the first measurement result to the first network device.

In an exemplary embodiment, the apparatus 1000 further comprises:

the measurement result receiving module is used for receiving a second measurement result sent by the first network device, wherein the second measurement result is obtained by measuring the first signal by the first network device;

and the switching instruction sending module is used for sending switching instruction information to the first network equipment when the second measurement result meets a first condition and the first measurement result meets a second condition or when the first measurement result meets the second condition, wherein the switching instruction information is used for instructing the terminal to be switched to the second network equipment.

In an exemplary embodiment, the apparatus 1000 further comprises: and the acquisition request sending module is used for sending a measurement result acquisition request to the first network equipment when the first measurement result meets a seventh condition, wherein the measurement result acquisition request is used for requesting to acquire the second measurement result.

Referring to fig. 11, a block diagram of a handover control apparatus according to another embodiment of the present application is shown. The device has the function of realizing the method example of the terminal side, and the function can be realized by hardware or can be realized by executing corresponding software by hardware. The device may be the terminal described above or may be provided in the terminal. As shown in fig. 11, the apparatus 1100 may include: a configuration information receiving module 1110 and an uplink signal transmitting module 1120.

The configuration information receiving module 1110 is configured to receive first configuration information, where the first configuration information is used to indicate a transmission configuration of the first signal.

An uplink signal sending module 1120, configured to send the first signal according to the first configuration information; the measurement result of the first signal is used for a network side to decide whether to switch the network equipment connected with the terminal.

Referring to fig. 12, a block diagram of a handover control apparatus according to another embodiment of the present application is shown. The device has the function of realizing the method example of the first network equipment side, and the function can be realized by hardware or can be realized by executing corresponding software by hardware. The apparatus may be the first network device described above, or may be provided in the first network device. As shown in fig. 12, the apparatus 1200 may include: a measurement result receiving module 1210, a handover request transmitting module 1220, a confirmation message receiving module 1230, and a specified condition confirming module 1240.

The measurement result receiving module 1210 is configured to receive a measurement result of a downlink reference signal sent by a terminal.

And a handover request sending module 1220, configured to send a handover request message to at least one second network device according to the measurement result, where the handover request message is used to request handover of the terminal to the at least one second network device.

An acknowledgement message receiving module 1230 is configured to receive a handover acknowledgement message sent by a target second network device of the at least one second network device, where the handover acknowledgement message is used to acknowledge handover of the terminal to the target second network device.

A specified condition confirmation module 1240, configured to not send a handover command to the terminal if it is confirmed that the target second network device meets the specified condition.

In an exemplary embodiment, the specified condition includes at least one of:

In an exemplary embodiment, the first feature includes at least one of:

In an exemplary embodiment, the cell of the second network device and the cell of the first network device belong to the same cell group.

In an exemplary embodiment, the apparatus 1200 further comprises: a target device selecting module, configured to select, when the first network device receives a handover confirm message sent by at least two second network devices, the target second network device from the at least two second network devices;

the target second network device is a second network device belonging to the same cell group as the cell of the first network device, or the target second network device is a second network device with optimal channel quality in the cell, or the target second network device is a second network device capable of supporting a specific service of the terminal.

It should be noted that, when the apparatus provided in the foregoing embodiment performs the functions thereof, only the division of the respective functional modules is used as an example, in practical application, the foregoing functional allocation may be performed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules, so as to perform all or part of the functions described above.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

Referring to fig. 13, a schematic structural diagram of a network device 130 according to an embodiment of the application is shown. The network device 130 may be a satellite or a base station. The network device 130 may include: a processor 131, a receiver 132, a transmitter 133, a memory 134, and a bus 135.

Processor 131 includes one or more processing cores, and processor 131 executes various functional applications and information processing by running software programs and modules.

The receiver 132 and the transmitter 133 may be implemented as one communication component, which may be a communication chip.

The memory 134 is coupled to the processor 131 via a bus 135.

The memory 134 may be used to store a computer program, and the processor 131 is used to execute the computer program to implement the steps performed by the first network device in the above-described method embodiment or to implement the steps performed by the second network device in the above-described method embodiment.

Further, the memory 134 may be implemented by any type of volatile or nonvolatile storage device, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

Referring to fig. 14, a schematic structural diagram of a terminal 140 according to an embodiment of the present application is shown, where the terminal 140 may include: processor 141, receiver 142, transmitter 143, memory 144, and bus 145.

Processor 141 includes one or more processing cores, and processor 141 executes various functional applications and information processing by running software programs and modules.

The receiver 142 and the transmitter 143 may be implemented as one communication component, which may be a communication chip.

The memory 144 is coupled to the processor 141 via a bus 145.

The memory 144 may be used to store a computer program for execution by the processor 141 to perform the various steps performed by the terminal in the method embodiments described above.

Further, the memory 144 may be implemented by any type of volatile or nonvolatile storage device, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

The embodiment of the application also provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to realize the switching control method of the network equipment side.

The embodiment of the application also provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to realize the terminal-side switching control method.

The application also provides a computer program product which, when run on a computer, causes the computer to execute the above-mentioned switching control method of the network equipment side.

The present application also provides a computer program product which, when run on a computer, causes the computer to execute the above-described terminal-side handover control method.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The foregoing description of the exemplary embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.

Claims

1. A handover control method, the method comprising:

the first network device sends measurement indication information to a second network devices, the measurement indication information is used for indicating the a second network devices to measure the first signals sent by the terminal to obtain a first measurement result, the first measurement result is used for deciding whether to switch the network devices connected with the terminal, the a is a positive integer,

wherein the measurement indication information includes: the first configuration information.

2. The method of claim 1, wherein the first signal belongs to an uplink reference signal.

3. The method according to claim 1 or 2, wherein the measurement indication information comprises:

and a first measurement activation instruction, wherein the first measurement activation instruction is used for triggering the a second network devices to activate measurement of the first signal.

4. A method according to any one of claims 1 to 3, wherein the measurement indication information comprises at least one of: a measurement start time of the first signal, a measurement end time of the first signal, a measurement duration of the first signal, and a measurement period of the first signal.

5. The method according to any one of claims 1 to 4, wherein after the first network device sends the configuration information of the first signal to the terminal, the method further comprises:

the first network equipment measures the first signal to obtain a second measurement result;

the first network device receives the first measurement result sent by b second network devices in the a second network devices, wherein b is a positive integer less than or equal to a;

when the second measurement result meets a first condition, and the first measurement result sent by a target second network device in the b second network devices meets a second condition, or when the first measurement result sent by the target second network device meets the second condition, the first network device sends a handover request message to the target second network device, where the handover request message is used to request the terminal to be handed over to the target second network device.

6. The method of claim 5, wherein the first condition comprises any one of:

the second measurement result is smaller than or equal to a first threshold value;

The second measurement result is continuously smaller than or equal to the first threshold value for N times;

the duration of the second measurement result being less than or equal to the first threshold value is greater than or equal to a first duration; the method comprises the steps of,

the duration of the second measurement result, which is continuously N times less than or equal to the first threshold value, is longer than or equal to the first duration;

wherein N is a positive integer.

7. The method of claim 5 or 6, wherein the second condition comprises any one of:

the first measurement result is greater than or equal to a second threshold value;

the first measurement result is greater than or equal to the second threshold value for M continuous times;

the duration of the first measurement result being greater than or equal to the second threshold value is greater than or equal to a second duration; the method comprises the steps of,

the duration of the first measurement result which is continuously M times greater than or equal to the second threshold value is longer than or equal to the second duration;

wherein M is a positive integer.

8. The method according to any of claims 5 to 7, wherein the first network device measures the first signal to obtain a second measurement result, further comprising:

And when the second measurement result meets a third condition, the first network device sends a measurement feedback instruction to the a second network devices, wherein the measurement feedback instruction is used for indicating the a second network devices to send the first measurement result to the first network device.

9. The method according to any one of claims 1 to 4, wherein after the first network device transmits measurement indication information to the a second network devices, further comprising:

the first network device receives switching indication information sent by b second network devices in the a second network devices, the switching indication information sent by a target second network device in the b second network devices is used for indicating to switch the terminal to the target second network device, and b is a positive integer smaller than or equal to a.

10. The method of claim 9, wherein before the first network device receives the handover indication information sent by b second network devices of the a second network devices, further comprising:

The first network device sends the second measurement result to the a second network devices.

11. The method according to any of claims 1 to 10, wherein after the first network device sends the first configuration information to the terminal, further comprising:

and when a second measurement result obtained by the first network equipment for measuring the first signal meets a fourth condition, the first network equipment sends the measurement indication information to the a second network equipment.

12. The method according to any one of claims 1 to 11, wherein after the first network device transmits measurement indication information to the a second network devices, further comprising:

the first network device sends a handover command to the terminal, where the handover command is used to instruct the terminal to handover from the first network device to a target second network device of the a second network devices.

13. The method according to any one of claims 1 to 11, wherein after the first network device transmits measurement indication information to the a second network devices, further comprising:

the first network device receives a switching confirmation message sent by a target second network device in the a second network devices, wherein the switching confirmation message is used for confirming that the terminal is switched to the target second network device;

14. The method of claim 13, wherein the specified conditions include at least one of:

15. The method of claim 14, wherein the first characteristic comprises at least one of:

16. A handover control method, the method comprising:

the second network device measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, the first measurement result is used for deciding whether to switch the network device connected with the terminal,

wherein the measurement indication information includes: and the first configuration information is used for indicating the transmission configuration of the first signal.

17. The method of claim 16, wherein the second network device measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, and further comprising:

The second network device sends the first measurement result to the first network device.

18. The method of claim 17, wherein the second network device sending the first measurement result to the first network device comprises:

each time the second network device obtains the first measurement result, the second network device sends the first measurement result to the first network device; or alternatively, the process may be performed,

the second network equipment processes the first measurement result obtained in a period of time to obtain a processed first measurement result, and sends the processed first measurement result to the first network equipment; or alternatively, the process may be performed,

the second network device sends the first measurement result to the first network device when the first measurement result meets a fifth condition; or alternatively, the process may be performed,

the second network device sends the first measurement result to the first network device after receiving a measurement feedback instruction sent by the first network device; or alternatively, the process may be performed,

and the second network equipment sends the first measurement result to the first network equipment after receiving the measurement feedback instruction sent by the first network equipment and when the first measurement result meets a sixth condition.

19. The method of claim 16, wherein the method further comprises:

the second network equipment receives a second measurement result sent by the first network equipment, wherein the second measurement result is obtained by measuring the first signal by the first network equipment;

when the second measurement result meets a first condition and the first measurement result meets a second condition, or when the first measurement result meets the second condition, the second network device sends switching indication information to the first network device, wherein the switching indication information is used for indicating the terminal to be switched to the second network device.

20. The method of claim 19, wherein the second network device measures the first signal sent by the terminal according to the measurement indication information to obtain a first measurement result, and further comprising:

and when the first measurement result meets a seventh condition, the second network device sends a measurement result acquisition request to the first network device, wherein the measurement result acquisition request is used for requesting to acquire the second measurement result.

21. A handover control method, the method comprising:

the first network device does not send a handover command to the terminal in case it is confirmed that the target second network device satisfies a specified condition,

wherein the specified conditions include:

and the switching confirmation message does not carry resource allocation information, and the resource allocation information is used for indicating the resources allocated by the target second network equipment for the terminal.

22. The method of claim 21, wherein the specified conditions further comprise at least one of:

the cell of the target second network device and the cell of the first network device belong to the same cell group and satisfy a first characteristic; the method comprises the steps of,

23. The method of claim 22, wherein the first characteristic comprises at least one of:

24. The method according to any of claims 21 to 23, wherein the cell of the second network device and the cell of the first network device belong to the same cell group.

25. The method according to any of claims 21 to 24, wherein after the first network device sends a handover request message to at least one second network device according to the measurement result, further comprising:

if the first network device receives a switching confirmation message sent by at least two second network devices, the first network device selects the target second network device from the at least two second network devices;

26. A handover control apparatus for use with a first network device, the apparatus comprising:

a measurement indication sending module, configured to send measurement indication information to a second network devices, where the measurement indication information is used to instruct the a second network devices to measure the first signal sent by the terminal, to obtain a first measurement result, where the first measurement result is used to determine whether to switch the network device connected to the terminal, and a is a positive integer,

27. The apparatus of claim 26, wherein the first signal belongs to an uplink reference signal.

28. The apparatus according to claim 26 or 27, wherein the measurement indication information comprises:

29. The apparatus according to any one of claims 26 to 28, wherein the measurement indication information comprises at least one of: a measurement start time of the first signal, a measurement end time of the first signal, a measurement duration of the first signal, and a measurement period of the first signal.

30. The apparatus according to any one of claims 26 to 29, further comprising:

31. The apparatus of claim 30, wherein the first condition comprises any one of:

wherein N is a positive integer.

32. The apparatus of claim 30 or 31, wherein the second condition comprises any one of:

wherein M is a positive integer.

33. The apparatus according to any one of claims 30 to 32, further comprising:

and the feedback instruction sending module is used for sending a measurement feedback instruction to the a second network devices when the second measurement result meets a third condition, wherein the measurement feedback instruction is used for indicating the a second network devices to send the first measurement result to the first network device.

34. The apparatus according to any one of claims 26 to 29, further comprising:

the indication information receiving module is used for receiving switching indication information sent by b second network devices in the a second network devices, the switching indication information sent by a target second network device in the b second network devices is used for indicating the terminal to be switched to the target second network device, and b is a positive integer smaller than or equal to a.

35. The apparatus of claim 34, wherein the apparatus further comprises:

36. The apparatus according to any one of claims 26 to 35, further comprising:

and the measurement indication sending module is used for sending the measurement indication information to the a second network devices when the second measurement result obtained by the first network device for measuring the first signal meets a fourth condition.

37. The apparatus according to any one of claims 26 to 36, further comprising:

and the switching command sending module is used for sending a switching command to the terminal, wherein the switching command is used for indicating the terminal to switch from the first network equipment to the target second network equipment in the a second network equipment.

38. The apparatus according to any one of claims 26 to 36, further comprising:

39. The apparatus of claim 38, wherein the specified conditions comprise at least one of:

40. The apparatus of claim 39, wherein the first characteristic comprises at least one of:

41. A handover control apparatus for use with a second network device, the apparatus comprising:

an uplink signal measurement module, configured to measure a first signal sent by a terminal according to the measurement indication information to obtain a first measurement result, where the first measurement result is used to determine whether to switch a network device connected to the terminal,

42. The apparatus of claim 41, further comprising:

and the measurement receiving and transmitting module is used for transmitting the first measurement result to the first network equipment.

43. The apparatus of claim 42, wherein the measurement transceiver module is configured to:

each time the first measurement result is obtained, the first measurement result is sent to the first network equipment; or alternatively, the process may be performed,

processing a first measurement result obtained in a period of time to obtain a processed first measurement result, and sending the processed first measurement result to the first network equipment; or alternatively, the process may be performed,

transmitting the first measurement result to the first network device when the first measurement result meets a fifth condition; or alternatively, the process may be performed,

after receiving a measurement feedback instruction sent by the first network device, sending the first measurement result to the first network device; or alternatively, the process may be performed,

and after receiving a measurement feedback instruction sent by the first network device, and when the first measurement result meets a sixth condition, sending the first measurement result to the first network device.

44. The apparatus of claim 41, further comprising:

45. The apparatus of claim 44, further comprising:

and the acquisition request sending module is used for sending a measurement result acquisition request to the first network equipment when the first measurement result meets a seventh condition, wherein the measurement result acquisition request is used for requesting to acquire the second measurement result.

46. A handover control apparatus for use with a first network device, the apparatus comprising:

a specified condition confirmation module for not sending a handover command to the terminal in case that the target second network device is confirmed to satisfy a specified condition,

wherein the specified conditions include:

47. The apparatus of claim 46, wherein the specified conditions further comprise at least one of:

48. The apparatus of claim 47, wherein the first characteristic comprises at least one of:

49. An apparatus as claimed in any one of claims 46 to 48, wherein the cell of the second network device and the cell of the first network device belong to the same cell group.

50. The apparatus of any one of claims 46 to 49, further comprising:

a target device selecting module, configured to select, when the first network device receives a handover confirm message sent by at least two second network devices, the target second network device from the at least two second network devices;

51. A network device comprising a processor and a memory, the memory storing a computer program for execution by the processor to implement the handover control method of any one of claims 1 to 15, or to implement the handover control method of any one of claims 16 to 20, or to implement the handover control method of any one of claims 21 to 25.

52. A computer-readable storage medium, in which a computer program is stored for execution by a processor to implement the handover control method of any one of claims 1 to 15, or to implement the handover control method of any one of claims 16 to 20, or to implement the handover control method of any one of claims 21 to 25.