CN114390610B - Cell switching method, communication device and storage medium - Google Patents

Abstract

The embodiment of the application provides a cell switching method, a communication device and a storage medium. In one scenario, a communication device resides in an SA cell and is in a connected state, and a cell handover method includes: receiving measurement configuration information of an A2 event; if the signal quality of the SA cell is lower than a first private threshold, a first measurement report of an A2 event is sent; the first private threshold is set for the communication device and is higher than the A2 event threshold; receiving measurement configuration information of an inter-system measurement event, wherein the measurement configuration information comprises an LTE (Long term evolution) adjacent cell; performing signal measurement on an LTE adjacent cell, and sending a second measurement report; wherein the signal quality of the LTE cell in the second measurement report is higher than a first threshold; and switching from the SA cell to a target cell through a cell switching process, wherein the target cell is one of the LTE cells. By setting the first private threshold, the SA cell can be switched to the LTE cell when the signal quality of the SA cell is general or poor, and the power consumption of the UE is saved.

Description

Cell switching method, communication device and storage medium

technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a cell handover method, a communication device, and a storage medium.

Background technique

The fifth generation mobile network (5th generation mobile networks, 5G) is the latest generation of mobile communication technology. Compared with the early 4G, 3G, 2G and other mobile communication technologies, 5G can provide higher data rate and lower delay. , full connection of the Internet of Everything, more energy saving, lower cost, higher system capacity and large-scale device access.

Currently, some configuration strategies allow terminal devices to preferentially reside in 5G cells. However, in the initial stage of 5G system construction, there are flaws in the optimization of network parameters. Moreover, 5G uses high-frequency bands and large bandwidths, and the power consumption of terminals when they reside in 5G cells is relatively high.

Contents of the invention

Embodiments of the present application provide a cell handover method, a communication device, and a storage medium. When the signal quality of a 5G cell is average, a terminal device can reside in an LTE cell, which saves power consumption.

In the first aspect, a cell handover method is provided, which is applied to a communication device. The communication device resides in an SA cell and is in a connected state. The method includes: receiving measurement configuration information of an A2 event, and the measurement configuration information of the A2 event includes an A2 event threshold Carry out signal measurement to the SA cell, if the signal quality of the SA cell is lower than the first private threshold (private threshold 1 in the embodiment of the application), then send the first measurement report of the A2 event; the first private threshold is set by the communication device and higher than the A2 event threshold; receive the measurement configuration information of the different system measurement event, the measurement configuration information of the different system measurement event includes the information of the LTE neighbor cell of the SA cell; perform signal measurement on the LTE neighbor cell, and send the second measurement report; Wherein, the signal quality of the LTE cell in the second measurement report is higher than the first threshold; the SA cell is switched to the target cell through a cell handover process, and the target cell is a cell in the LTE cell.

The communication method provided in the first aspect may be applied to a scenario where a terminal device in a connected state switches from an SA cell to an anchor LTE cell/common LTE cell. The terminal device can set a private threshold 1, and the private threshold 1 is greater than the A2 event threshold configured on the network side. The terminal device can compare the signal quality of the SA cell with the private threshold 1. When the signal quality of the SA cell is lower than the private threshold 1, the terminal device can switch from the SA cell to the anchor LTE cell/common LTE cell. By setting the private threshold 1, the handover judgment conditions of the system are relaxed when the terminal equipment is handed over from the SA cell to the LTE cell. When the signal quality of the SA cell is average or poor, it can be switched to the LTE cell, which saves the power consumption of the terminal equipment. It reduces the heat generation of the terminal equipment and prolongs the battery life.

In a possible implementation, signal measurement is performed on LTE neighboring cells, and the second measurement report is sent, including: obtaining anchor LTE cell information; performing signal measurement on anchor LTE cells in LTE neighboring cells according to the anchor LTE cell information ; If the signal quality of the anchor LTE cell in the LTE neighbor cell is higher than the first threshold, a second measurement report is sent; both the LTE cell and the target cell are anchor LTE cells.

In this implementation manner, it is first determined whether the anchor LTE cell is higher than the first threshold. If there is an anchor LTE cell higher than the first threshold, it will switch from the SA cell to the anchor LTE cell, realizing the independent selection of the terminal device to switch from the SA cell to the anchor LTE cell preferentially, and the terminal device uses the CONFIG D scheme to display the signal icon , the signal icon is always 5G, which improves the user experience.

In a possible implementation manner, it also includes: if there is no anchor LTE cell in the LTE neighboring cell whose signal quality is higher than the first threshold, performing signal measurement on a common LTE cell in the LTE neighboring cell; If the signal quality of the normal LTE cell is higher than the first threshold, a second measurement report is sent; both the LTE cell and the target cell are common LTE cells.

In this implementation, it is first judged whether the anchor LTE cell is higher than the first threshold, and if no anchor LTE cell is higher than the first threshold, then it is judged whether the common LTE cell is higher than the first threshold. If there is a normal LTE cell higher than the first threshold, switch from the SA cell to the normal LTE cell to reduce the power consumption of the terminal device.

In a possible implementation, the first private threshold includes private threshold 1a and private threshold 1b, private threshold 1a>private threshold 1b; before sending the second measurement report, it also includes: determining that the signal quality of the SA cell is lower than the private threshold 1a And higher than the private threshold 1b.

In this implementation, two first private thresholds are set. When the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b, if there is an anchor LTE cell higher than the first threshold, the terminal device can switch from the SA cell to the anchor LTE cell, if there is no anchor LTE cell Above the first threshold, the terminal device continues to reside in the SA cell, ensuring that the service rate and signal icon are always displayed as 5G, which improves user experience.

In a possible implementation, the first private threshold includes private threshold 1a and private threshold 1b, private threshold 1a>private threshold 1b; before sending the second measurement report, it also includes: determining that the signal quality of the SA cell is lower than the private threshold 1b .

In this implementation, two first private thresholds are set. When the signal quality of the SA cell is lower than the private threshold 1b, if there is an anchor LTE cell higher than the first threshold, the terminal device can switch from the SA cell to the anchor LTE cell, ensuring that the service rate and signal icon are always displayed as 5G, improving user experience. If there is no anchor LTE cell higher than the first threshold, but there is a normal LTE cell higher than the first threshold, the terminal device can switch from the SA cell to the normal LTE cell to ensure that the power consumption of the terminal device is reduced.

In a possible implementation, acquiring the anchor LTE cell information includes: sending the location information of the communication device to the cloud server, and receiving the anchor LTE cell information sent by the cloud server; and/or, acquiring the anchor LTE cell information, The anchor LTE cell information includes information about the anchor LTE cell where the communication device once camped.

In a possible implementation manner, the measurement configuration information of the different-system measurement event includes the measurement configuration information of the B1 event or the measurement configuration information of the B2 event.

In a possible implementation, the first threshold includes any one of the following: B1 event different-system neighboring cell threshold, B2 event different-system neighboring cell threshold or the second private threshold (private threshold 2 in the embodiment of this application) , the second private threshold is set by the communication device.

In this implementation manner, there are multiple options for the first threshold, which improves the flexibility of setting the threshold for reporting the B1 event by the terminal device.

In a possible implementation manner, the second private threshold may include a private threshold 2a and a private threshold 2b, and the private threshold 2a<private threshold 2b. The private threshold 2a is for the anchor LTE cell, and the private threshold 2b is for the common LTE cell. If the terminal device determines that the signal quality of the anchor LTE cell is greater than the private threshold 2a, it switches from the SA cell to the anchor LTE cell. If the terminal device determines that there is no anchor LTE cell whose signal quality is greater than the private threshold 2a, but there is a common LTE cell whose signal quality is greater than the private threshold 2b, it will switch from the SA cell to the common LTE cell. By setting the private threshold 2a<private threshold 2b, the threshold value for the terminal device to switch to the anchor LTE cell is reduced, making it easier for the terminal device to switch to the anchor LTE cell, giving priority to guaranteeing the service rate, and reducing the power consumption of the terminal device at the same time. Make sure the terminal device displays the 5G signal icon.

In the second aspect, a cell handover method is provided, which is applied to a communication device. The communication device resides in an SA cell and is in an idle state. The method includes: when it is detected that the signal quality of the SA cell is lower than the first private threshold, triggering a search LTE cell; the first private threshold is higher than the serving cell threshold configured on the network side for reselection to a low-priority cell, and the LTE cell includes an anchor LTE cell and/or a normal LTE cell; if the target cell is found, cell reselection is performed The procedure is to reselect from the SA cell to the target cell; the target cell is a cell in the LTE cell, and the signal quality of the target cell is higher than the first threshold.

The communication method provided by the second aspect can be applied to a scenario where a terminal device in an idle state reselects from an SA cell to an anchor LTE cell/common LTE cell. The terminal device may set a private threshold 1, and the private threshold 1 is greater than the serving cell threshold for reselecting to a low-priority cell configured on the network side. The terminal device can compare the signal quality of the SA cell with the private threshold 1. When the signal quality of the SA cell is average or poor, it can reselect to the LTE cell, which saves the power consumption of the terminal device, reduces the heat generated by the terminal device, and prolongs the service life of the terminal device. battery life.

In a possible implementation manner, searching for the target cell includes: obtaining anchor LTE cell information; searching for the anchor LTE cell according to the anchor LTE cell information; if the signal quality of the anchor LTE cell is higher than the first threshold , it is determined that the target cell is found; the target cell is the anchor LTE cell.

In this implementation manner, it is first determined whether the anchor LTE cell is higher than the first threshold. If there is an anchor LTE cell higher than the first threshold, it will reselect from the SA cell to the anchor LTE cell, realizing the independent selection of the terminal device from the SA cell to the anchor LTE cell, and the terminal device adopts the CONFIG D scheme to display When the signal icon is turned on, the signal icon is always 5G, which improves the user experience.

In a possible implementation, it also includes: if there is no anchor LTE cell whose signal quality is higher than the first threshold, then search for a common LTE cell; if there is a common LTE cell whose signal quality is higher than the first threshold, then determine The target cell is found; the target cell is a common LTE cell.

In this implementation, it is first judged whether the anchor LTE cell is higher than the first threshold, and if no anchor LTE cell is higher than the first threshold, then it is judged whether the common LTE cell is higher than the first threshold. If there is a normal LTE cell higher than the first threshold, reselect from the SA cell to the normal LTE cell to reduce the power consumption of the terminal device.

In a possible implementation, the first private threshold includes private threshold 1a and private threshold 1b, private threshold 1a>private threshold 1b; before determining that the target cell is found, it also includes: determining that the signal quality of the SA cell is lower than the private threshold 1a And higher than the private threshold 1b.

In this implementation, two first private thresholds are set. When the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b, if there is an anchor LTE cell higher than the first threshold, the terminal device can reselect from the SA cell to the anchor LTE cell, if there is no anchor LTE cell If the cell is higher than the first threshold, the terminal device continues to reside in the SA cell, ensuring that the signal icon is always displayed as 5G, which improves user experience. Moreover, the terminal equipment resides in the SA cell, and can access the SA cell as soon as possible when there is a service requirement.

In a possible implementation, the first private threshold includes private threshold 1a and private threshold 1b, private threshold 1a>private threshold 1b; before determining that the target cell is found, it also includes: determining that the signal quality of the SA cell is lower than the private threshold 1b .

In this implementation, two first private thresholds are set. When the signal quality of the SA cell is lower than the private threshold 1b, if there is an anchor LTE cell higher than the first threshold, the terminal device can reselect from the SA cell to the anchor LTE cell, ensuring that the service rate and signal icon are always displayed as 5G, Improved user experience. If there is no anchor LTE cell higher than the first threshold, but there is a normal LTE cell higher than the first threshold, the terminal device can reselect from the SA cell to the normal LTE cell to ensure that the power consumption of the terminal device is reduced.

In a possible implementation, acquiring the anchor LTE cell information includes: sending the location information of the communication device to the cloud server, and receiving the anchor LTE cell information sent by the cloud server; and/or, acquiring the anchor LTE cell information, The anchor LTE cell information includes the information of the anchor LTE cell where the communication device once camped; and/or, receiving the system message of the LTE cell, the system message includes an information element indicating whether the LTE cell is the anchor LTE cell, according to the information element Get the anchor LTE cell information.

In a possible implementation, the first threshold includes any one of the following: a low-priority reselection neighbor cell threshold or a second private threshold, and the low-priority reselection neighbor cell threshold is configured by the network side. Two private thresholds for communicator settings.

In this implementation manner, there are multiple options for the first threshold, which improves the flexibility of the threshold setting for the terminal device to determine the target cell.

In a possible implementation manner, the second private threshold may include a private threshold 2a and a private threshold 2b, and the private threshold 2a<private threshold 2b. The private threshold 2a is for the anchor LTE cell, and the private threshold 2b is for the common LTE cell. If the terminal device determines that the signal quality of the anchor LTE cell is greater than the private threshold 2a, it reselects from the SA cell to the anchor LTE cell. If the terminal device determines that there is no anchor LTE cell whose signal quality is greater than the private threshold 2a, but there is a common LTE cell whose signal quality is greater than the private threshold 2b, it reselects from the SA cell to the common LTE cell. By setting the private threshold 2a<private threshold 2b, the threshold for reselecting the terminal device to the anchor LTE cell is reduced, making it easier for the terminal device to reselect to the anchor LTE cell, and at the same time reducing the power consumption of the terminal device, ensuring that the terminal device Show 5G signal icon.

In the third aspect, a cell switching method is provided, which is applied to a communication device. The communication device resides in an LTE cell and is in a connected state. The LTE cell is an anchor LTE cell or a common LTE cell. The method includes: receiving a B1 event or a B2 event The measurement configuration information of the B1 event or the B2 event includes the information of the NR neighboring cell of the LTE cell; the signal measurement of the NR neighboring cell is performed, and the first measurement report is sent; wherein, the signal of the NR cell in the first measurement report The quality is higher than the third private threshold (private threshold 3 in the embodiment of this application), the third private threshold is set by the communication device, and the third private threshold is higher than the B1 event different-system adjacent cell threshold or the B2 event different-system adjacent cell threshold ; Establish a connection with the target NR cell, where the target NR cell is one of the NR cells.

The communication method provided by the third aspect can be applied to scenarios where a terminal device in a connected state switches from an anchor LTE cell/common LTE cell to an SA cell or establishes an ENDC dual connection to connect to a 5G cell. The terminal device can set a private threshold 3, and the private threshold 3 is greater than the B1 event inter-system neighboring cell threshold configured on the network side. The terminal device can compare the signal quality of the NR cell with the private threshold 3. By setting the private threshold 3, the conditions for the terminal device to switch from the anchor LTE cell/common LTE cell to the SA cell or establish ENDC dual connection to connect to the 5G cell are raised. When the signal quality of the NR cell is very good, it can be switched to the NR cell. , which saves the power consumption of the terminal equipment, reduces the calorific value of the terminal equipment, and prolongs the battery life. At the same time, the service rate is also improved.

In a possible implementation, the LTE cell is an ordinary LTE cell, and establishing a connection with the target NR cell includes: switching from the ordinary LTE cell to the target NR cell through a cell handover process, and the target NR cell is an independent networking SA cell.

In a possible implementation, the LTE cell is the anchor LTE cell, and establishing a connection with the target NR cell includes: switching from the anchor LTE cell to the target NR cell through a cell switching process, and the target NR cell is an SA cell; or, establishing Dual connectivity ENDC dual connectivity with 4G-5G wireless access to the target NR cell, the target NR cell is the NR cell connected to the anchor LTE cell.

In the fourth aspect, a cell switching method is provided, which is applied to a communication device. The communication device resides in an LTE cell and is in an idle state. The LTE cell is an anchor LTE cell or a normal LTE cell. The method includes: searching for an SA cell; To the target SA cell, reselect from the LTE cell to the target SA cell through the cell reselection process; wherein, the signal quality of the target SA cell is higher than the third private threshold, the third private threshold is set by the communication device, and is higher than the network The neighbor cell threshold for high-priority reselection configured on the side.

The communication method provided in the fourth aspect may be applied to a scenario where a terminal device in an idle state reselects from an anchor LTE cell/common LTE cell to an SA cell. The terminal device can set a private threshold 3, and the private threshold 3 is greater than the neighbor cell threshold for high-priority reselection configured on the network side. The terminal device can compare the signal quality of the SA cell with the private threshold 3. By setting the private threshold 3, the different system conditions when the terminal device reselects from the anchor LTE cell/common LTE cell to the SA cell are improved. When the signal quality of the SA cell is very good, it can be reselected to the SA cell, which saves the terminal device. Reduce power consumption, reduce heat generation of terminal equipment, and prolong battery life. At the same time, the service rate is also improved.

In a possible implementation manner, searching for an SA cell in an independent networking includes: obtaining an SA neighboring cell of the LTE cell; and searching for the SA cell according to the SA neighboring cell.

In a possible implementation manner, searching for an SA cell in an independent networking includes: obtaining the frequency point of the SA cell, and the frequency point of the SA cell includes the frequency point of the SA cell where the communication device once resided; performing SA according to the frequency point of the SA cell. District search.

In the fifth aspect, a cell switching method is provided, which is applied to a communication device, and the communication device resides in a common LTE cell. state, execute the L2NR re-establishment procedure to switch from a normal LTE cell to a target NR cell; if the communication device is in an idle state, search for an NR cell, and if the target NR cell is found, reselect to the target NR cell; among them, the target NR cell The signal quality of is higher than the fourth private threshold (private threshold 4 in the embodiment of the present application), and the fourth private threshold is set by the communication device.

The communication method provided in the fifth aspect can be applied to a scenario where a terminal device residing in a common LTE cell is rapidly handed over to an NR cell. When the terminal device is in the connected state, through the L2NR re-establishment process, it actively and quickly initiates a handover from a normal LTE cell to an NR cell, which shortens the handover delay. When the terminal device is in an idle state, it can autonomously search for NR cells, quickly access NR cells, and shorten the handover delay. The terminal device can set a private threshold 4, and the private threshold 4 is smaller than the private threshold 3. When the terminal device determines the target NR cell, it can compare the signal quality of the NR cell with the private threshold 4, and when the signal quality of the NR cell is higher than the private threshold 4, the terminal device can switch. By setting the private threshold 4, the service rate requirement is met on the basis of fast handover of the terminal equipment from the common LTE cell to the NR cell.

In a possible implementation manner, the preset condition includes at least one of the following: a whitelist application program is running in the foreground; the data volume of the data to be uploaded or the data to be downloaded is greater than a preset value.

In a sixth aspect, an apparatus is provided, including: a unit or means for performing each step in any one of the above aspects.

According to a seventh aspect, a communication device is provided, and the communication device includes a processor, and the processor is configured to be coupled with a memory, read instructions in the memory, and make the communication device execute the method provided in any one of the above aspects according to the instructions.

In a possible implementation manner, the communication device is a terminal or a chip.

In an eighth aspect, a program is provided, which is used to execute the method provided in any one of the above aspects when executed by a processor.

In a ninth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the instructions are run on a computer or a processor, the method provided in any one of the above aspects is implemented.

In a tenth aspect, a program product is provided, the program product includes a computer program, the computer program is stored in a readable storage medium, and at least one processor of a device can read the computer program from the readable storage medium , the at least one processor executes the computer program so that the device implements the method provided in any aspect above.

In an eleventh aspect, an apparatus is provided, including a communication module and a processing module. The communication module can receive data sent by other devices or receive data from other devices, for example, receive system messages, receive measurement configuration information of A2 events, measurement configuration information of B1 events, measurement configuration information of B2 events, and send measurement reports of A2 events . Sending a measurement report of the B1 event or sending a measurement report of the B2 event. The processing module can be used to detect the signal quality of the current serving cell, detect the signal quality of different system cells, search for cells, determine the target cell for switching, determine the target cell for reselection, or perform cell reselection procedures, cell switching procedures, and establish ENDC Dual connectivity, etc., to implement the method provided by any of the above aspects.

Description of drawings

FIG. 1 is a schematic diagram of a networking mode of a mobile communication system applicable to an embodiment of the present application;

FIG. 2 is a schematic diagram of a 5G NSA networking;

Fig. 3 is a schematic diagram of data distribution in 5G NSA networking;

Fig. 4 is another schematic diagram of data distribution in 5G NSA networking;

FIG. 5 is a schematic diagram of a scenario in which an existing terminal device is handed over from an SA cell to an NSA cell/common LTE cell;

FIG. 6 is a schematic diagram of handover results from an SA cell to an NSA cell/common LTE cell when the existing terminal equipment is in a different state;

FIG. 7 is a message interaction diagram for switching from an SA cell to an NSA cell/common LTE cell when the existing terminal device is in a connected state;

FIG. 8 is a message interaction diagram for switching from an SA cell to an NSA cell/common LTE cell when the existing terminal equipment is in an idle state;

FIG. 9 is a schematic diagram of a scenario in which a terminal device switches from an SA cell to an NSA cell/common LTE cell according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a handover result when a terminal device is in a different state from an SA cell to an NSA cell/common LTE cell according to an embodiment of the present application;

FIG. 11 is a message interaction diagram for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in the connected state provided by the embodiment of the present application;

FIG. 12 is a message interaction diagram for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in an idle state according to an embodiment of the present application;

FIG. 13 is a flow chart of switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in the connected state provided by the embodiment of the present application;

FIG. 14 is another flow chart for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in the connected state provided by the embodiment of the present application;

FIG. 15 is another flow chart for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in the connected state provided by the embodiment of the present application;

FIG. 16 is a flow chart of switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in an idle state according to an embodiment of the present application;

FIG. 17 is another flow chart for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in an idle state according to an embodiment of the present application;

FIG. 18 is another flow chart for switching from an SA cell to an NSA cell/common LTE cell when the terminal device is in an idle state according to an embodiment of the present application;

FIG. 19 is a schematic diagram of a scenario in which an existing terminal device is handed over from an NSA cell/normal LTE cell to an NR cell;

FIG. 20 is a schematic diagram of a handover result from an NSA cell/common LTE cell to an NR cell when the existing terminal equipment is in a different state;

FIG. 21 is a message interaction diagram for switching from an NSA cell/common LTE cell to an NR cell when the existing terminal device is in a connected state;

FIG. 22 is a message interaction diagram for switching from an NSA cell/common LTE cell to an SA cell when the existing terminal equipment is in an idle state;

FIG. 23 is a schematic diagram of a scenario where a terminal device switches from an NSA cell/normal LTE cell to an NR cell according to an embodiment of the present application;

FIG. 24 is a message interaction diagram for switching from an NSA cell/normal LTE cell to an NR cell when the terminal device is in the connected state provided by the embodiment of the present application;

FIG. 25 is a message interaction diagram for switching from an NSA cell/common LTE cell to an SA cell when the terminal device is in an idle state according to an embodiment of the present application;

FIG. 26 is a flow chart of handing over a terminal device from a common LTE cell to an NR cell according to an embodiment of the present application;

FIG. 27 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

FIG. 28 is another schematic structural diagram of a terminal device provided by an embodiment of the present application.

detailed description

Embodiments of the present application are described below in conjunction with the accompanying drawings.

First, the networking mode of the mobile communication system to which the embodiment of the present application is applied will be described.

5G is the latest generation of mobile communication technology. Compared with the early mobile communication technologies such as 4G, 3G, and 2G, 5G can provide higher data rate, lower delay, full connection of the Internet of Everything, more energy saving, and lower cost, higher system capacity and large-scale equipment access. 5G new air interface (new radio, NR) is a new radio access technology (radioaccess technology, RAT), developed by the third generation partnership project (3rd generation partnership project, 3GPP), used in 5G mobile communication network, is 5G A global standard for network air interfaces.

Existing 5G standards define various networking modes, including standalone networking (standalone, SA) and non-standalone networking (non-standalone, NSA). Optionally, both the core network of the 5G NSA and the 5G SA may be a 4G core network (evolved packet core, EPC) or a 5G core network (5G core network, 5GC). 5G NSA networking can also be called 4G-5G wireless access dual connectivity (EUTRN-NR dual connectivity, EN-DC) networking. In the initial stage of 5G system construction, 5GNSA networking is widely used.

Exemplarily, FIG. 1 is a schematic diagram of a networking manner of a mobile communication system applicable to an embodiment of the present application. As shown in Figure 1, in the scenario where the 4G system and the 5G system coexist, the networking methods may include: Long Term Evolution (LTE) networking (or called LTE independent networking), 5G NSA networking and 5G SA networking. Wherein, the base station in the 4G mobile communication network may be called a 4G base station (evolved nodeB, eNB), and the base station in the 5G mobile communication network may be called a 5G base station (5G nodeB, gNB). Cells can be configured on eNB and gNB, and each cell has a certain signal coverage. As shown in (a) of FIG. 1 , in the LTE networking mode, the LTE cell is provided by the eNB, and the eNB accesses the EPC. As shown in (b) in Figure 1, in the 5G NSA networking mode, the LTE cell is provided by the eNB, and the NR cell is provided by the gNB. The gNB can be used as a slave station of the eNB. Both the eNB and the gNB are connected to the EPC or 5GC. As shown in (c) in Figure 1, it can be the target networking mode of 5G SA, the NR cell is provided by gNB, and gNB directly accesses 5GC. It should be noted that FIG. 1 only shows a part of the networking mode, and does not limit the 4G networking mode and the 5G networking mode. For example, 5G NSA networking methods can include Option 3/3a/3x, Option 4/4a, Option7/7a/7x and other possible methods.

The following describes the 5G NSA networking mode in detail with reference to Figures 2 to 4.

1. Connection between user equipment (UE) and base station

As shown in Figure 2, the UE can be simultaneously connected to the base station eNB of 4G LTE and the base station gNB of 5G NR. Wherein, the eNB is a master node, and is also called a master station, a master 4G base station (master eNB, MeNB) or a master node (masternode, MN) in the EN-DC in the EN-DC. In the EN-DC networking mode, the base station of 5G NR can be called En-gNB. The En-gNB is a secondary node, and is also called a secondary station, a secondary 5G base station (secondary gNB, SgNB) or a secondary node (secondary node, SN) in the EN-DC in the EN-DC.

2. Connection between base stations

The eNB is connected to the En-gNB through the X2 interface.

3. The connection between the base station and the core network

In Figure 2, both eNB and En-gNB are connected to the 4G core network. The 4G core network may include a mobility management entity (mobility management entity, MME) and a serving gateway (serving gateway, SGW). The eNB is connected to the MME through the S1-C interface, and connected to the SGW through the S1-U interface. There is no direct connection between En-gNB and MME, and all control plane signaling is forwarded by eNB. Whether the En-gNB is connected to the SGW through the S1-U interface depends on which EN-DC protocol stack architecture is used for data transmission.

4. Bearer type

In the EN-DC networking mode, the UE maintains dual connections with the eNB and the En-gNB at the same time, and uses the wireless resources of the two base stations for data transmission at the same time. Among them, the cells configured for the UE and belonging to the eNB and the En-gNB are divided into two cell groups (cell groups), and the cells belonging to the eNB are called the master cell group (MCG) under the master node in the EN-DC , the cell belonging to the En-gNB is called a cell group (secondary cell group, SCG) under the secondary node in the EN-DC. In each cell group, a radio link control (radio link control, RLC) configuration and logical channel configuration of a radio bearer is called an RLC bearer. According to the distribution of data on the primary station and secondary station, it can be divided into the following four DC bearer types:

(1) MCG bearer: the data is only on the master station, and the RLC bearer is only configured on the MCG.

(2) SCG bearer: data is only on the secondary station, and RLC bearer is only configured on the SCG.

(3) MCG Split bearer: Data is distributed at the master station, and RLC bearer is configured on both MCG and SCG.

(4) SCG Split bearer: Data is distributed in the secondary station, and RLC bearer is configured on the MCG and SCG at the same time.

Exemplarily, FIG. 3 is a schematic diagram of data offload in 5G NSA networking, showing MCG bearer, SCG bearer and MCG Split bearer. As shown in Figure 3, the protocol stack of eNB may include medium access control (medium access control, MAC), RLC layer and packet data convergence protocol (PDCP) layer, and the protocol stack of gNB may include NR MAC layer, NR RLC layer layer and NR PDCP layer. Taking downlink data transmission under dual connectivity as an example, the bearer type is described. In the MCG Split bearer mode, the data streams are aggregated on the PDCP layer, and then the data streams are transmitted to the UE simultaneously through multiple base stations. In this case, one PDCP entity can be associated with two RLC entities. It can be understood that the PDCP layer transmits the data flow to the RLC layer through the RLC1 and RLC2 links. Specifically, the RLC1 link can be understood as an LTE link, and the RLC2 link A road can be understood as an NR link, and each RLC entity corresponds to an LTE air interface and an NR air interface. In this scenario, the PDCP data flow will send PDCP packets on the air interfaces of LTE and NR respectively according to the obtained authorization. In the MCG bearer mode, the PDCP layer is associated with an RLC entity, and the data of the PDCP layer is directly transmitted to the RLC layer. In the SCG bearer mode, data is transmitted at the NR PDCP layer, that is, the data is transmitted on the secondary station. At this time, an NR RLC entity is associated, and the data at the NR PDCP layer is directly transmitted to the NR RLC layer. In some embodiments, each RLC entity may correspond to at least one bearer link, and in some embodiments, the RLC layer may also have multiple RLC entities.

Exemplarily, FIG. 4 is another schematic diagram of data offload in 5G NSA networking, showing MCG bearer, SCG bearer and SCGSplit bearer. For the MCG bearer and the SCG bearer, refer to the description in FIG. 3 , which will not be repeated here. As shown in Figure 4, in the SCGSplit bearer mode, data is aggregated at the NR PDCP layer, and one NR PDCP entity can be associated with two RLC entities, corresponding to the NR RLC layer and the RLC layer. At this time, the data is distributed at the secondary station.

It should be noted that the embodiment of the present application does not limit the name and type of the UE. For example, a UE may also be called a communication device, a communication device, a terminal device, a mobile station (mobile station, MS), a terminal, or a mobile terminal (mobile terminal, MT), etc., and may be a device that provides voice/data connectivity to users , such as handheld devices or vehicle-mounted devices with wireless connectivity. At present, examples of some terminal devices are: mobile phone (mobile phone), tablet computer, notebook computer, palmtop computer, mobile internet device (mobile internet device, MID), wearable device, virtual reality (virtual reality, VR) device, enhanced Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, smart grid ), wireless terminals in transportation safety, wireless terminals in smart city, or wireless terminals in smart home.

Next, the cell types involved in the embodiment of the present application will be described.

1. SA cell: refers to the 5G cell in the 5G SA network. For example, as shown in (c) in Figure 1, the cell configured on the 5G base station may be called an SA cell.

2. NSA cell/anchor LTE cell: Refers to the LTE cell that can establish ENDC dual connection to connect with the 5G cell during 5G NSA networking. For example, as shown in (b) in FIG. 1 , the eNB is the master station, and the cell configured on the eNB may be called an NSA cell or an anchor LTE cell. For convenience of description, the description method of "NSA cell" is adopted in the embodiment of the present application.

3. Ordinary LTE cell: refers to the LTE cell in 4G independent networking. For example, as shown in (a) in FIG. 1 , a cell configured on a 4G base station may be called a common LTE cell.

4. NR cell: refers to all 5G cells, including SA cells and 5G cells that are connected to NSA cells after establishing ENDC dual connections during 5G NSA networking. For example, in (b) in Figure 1, after the UE establishes dual connectivity, the cell configured on the En-gNB is an NR cell, but not an SA cell.

5. LTE cell: refers to all 4G cells, including ordinary LTE cells and NSA cells/anchor LTE cells.

Next, the measurement events and thresholds involved in the embodiments of the present application will be described.

1. A2 event and A2 event threshold

The A2 event is a measurement event for this system, which means that the signal quality of the current serving cell is lower than the A2 event threshold. The A2 event threshold is configured on the base station side (or network side). When the base station configures A2 event measurement, the base station sends measurement configuration information to the UE, which carries the A2 event threshold. Correspondingly, the UE receives the measurement configuration information, and performs signal measurement on the current serving cell. If the UE detects that the signal quality of the current serving cell is lower than the A2 event threshold, it reports the A2 event. Optionally, the A2 event can be used to trigger cell handover. Optionally, the A2 event may be used to start the inter-cell measurement, for example, the inter-system B1 event measurement.

It should be noted that in the cell handover method provided in the embodiment of the present application, when the UE reports the A2 event, it compares the signal quality of the current serving cell with the private threshold 1 set by the UE.

2. B1 event and B1 event threshold

The B1 event is a measurement event for the different system, which means that the signal quality of the neighboring cell of the different system is higher than the threshold of the neighboring cell of the different system of the B1 event. The B1 event and threshold are configured by the base station side (or network side). When the base station configures B1 event measurement, the base station sends measurement configuration information to the UE, which carries the B1 event different-system neighboring cell threshold and the different-system neighboring cell frequency point. Correspondingly, the UE receives the measurement configuration information, and performs signal measurement of neighboring cells of different systems according to frequency points. If the UE detects that the signal quality of a neighboring cell of a different system is higher than the threshold of a neighboring cell of a different system for a B1 event, it reports a B1 event. Optionally, the B1 event can be used to trigger switching between systems.

It should be noted that in the cell handover method provided by the embodiment of the present application, when the UE reports the B1 event, it compares the signal quality of the neighboring cell of the different system with the private threshold 2 or private threshold 3 set by the UE.

3. B2 event and B2 event threshold

The B2 event is also a measurement event for a different system, which means that the signal quality of the serving cell is lower than the threshold of the B2 event serving cell and the signal quality of the neighboring cell of the different system is higher than the threshold of the neighboring cell of the B2 event. The B2 event and threshold are configured by the base station side (or network side). When the base station configures B2 event measurement, the base station sends measurement configuration information to the UE, which carries the B2 event threshold and frequency point. Correspondingly, the UE receives the measurement configuration information, and performs signal measurement of neighboring cells of different systems according to frequency points. If the UE detects that the signal quality of the serving cell is lower than the B2 event serving cell threshold and the signal quality of the different-system neighboring cell is higher than the B2 event different-system neighboring cell threshold, the UE reports the B2 event. Optionally, the B2 event can be used to trigger switching between systems.

It should be noted that in the cell handover method provided by the embodiment of this application, when the UE reports the B2 event, in the scenario where the UE is handed over from the SA cell to the NSA cell/normal LTE cell, the signal quality of the current serving cell is compared with the UE-set signal quality. The private threshold 1 is used to compare the signal quality of neighboring cells of different systems with the private threshold 2 set by the UE. In the scenario where the UE switches from an NSA cell/normal LTE cell to an SA cell or establishes ENDC dual connectivity to connect to a 5G cell, compare the signal quality of the current serving cell with the B2 event serving cell threshold configured on the network side, and The signal quality of the zone is compared with the private threshold 3 set by the UE.

It should be noted that both the B1 event and the B2 event are inter-system measurement events, and in the cell handover method provided in the embodiment of the present application, the B1 event is taken as an example for description. The B1 event in this embodiment of the present application may also be the B2 event.

4. Serving cell threshold 1 for reselection to a low-priority cell and low-priority reselection neighbor cell threshold 2

Applicable to scenarios where UEs in idle state reselect from SA cells to NSA cells/common LTE cells, all are configured by the base station side and can be carried in system messages. Generally, the reselection of the UE from the SA cell to the LTE cell network is configured as a low-priority reselection, and conversely, the reselection from the LTE cell to the SA cell network is configured as a high-priority reselection.

5. High priority neighbor cell reselection threshold 3

Applicable to the scenario where an idle UE reselects from an NSA cell/common LTE cell to an SA cell. It is configured by the base station and can be carried in system messages.

6. Private Threshold 1 and Private Threshold 2

Private threshold 1 and private threshold 2 are set by the UE, and are applicable to the scenario where the UE switches from an SA cell to an NSA cell/common LTE cell. The private threshold 1 is for the SA cell, and is used by the UE to judge whether the signal quality of the SA cell is lower than the private threshold 1. The private threshold 2 is for the NSA cell/common LTE cell, and is used for the UE to judge whether the signal quality of the NSA cell/common LTE cell is higher than the private threshold 2.

7. Private Threshold 3 and Private Threshold 4

Private threshold 3 and private threshold 4 are set by the UE, and are applicable to the scenario where the UE switches from an NSA cell/normal LTE cell to an NR cell. Both the private threshold 3 and the private threshold 4 are for the NR cell, and are used by the UE to judge whether the signal quality of the NR cell is higher than the private threshold 3 or the private threshold 4. Wherein, the value of the private threshold 3 is higher than the private threshold 4. Private Threshold 3 can be applied to scenarios where the UE switches from an NSA cell/common LTE cell to an SA cell with very good signal quality or establishes ENDC dual connectivity with a 5G cell in a non-standalone network. The private threshold 4 can be applied to scenarios where the UE quickly switches from an NSA cell/common LTE cell to an SA cell or establishes an ENDC dual connection.

It should be noted that the embodiments of the present application do not limit the names of the above parameters.

The cell handover method provided in the embodiment of the present application is used to realize handover of UE between SA cell and NSA cell/common LTE cell. The application scenario may include: UE handover from SA cell to NSA cell/normal LTE cell, and UE handover from NSA cell/normal LTE cell to SA cell or establishment of ENDC dual connection. Since 5G can provide higher data rates and lower delays, currently, some configuration strategies allow UEs to preferentially camp on SA cells. However, in the early stage of 5G system construction, there are defects in the optimization of network parameters. Moreover, 5G uses high-frequency bands and large bandwidths, and the power consumption of terminals when they reside in SA cells is high, resulting in poor battery life and high heat generation of UEs. Through the cell switching method provided by the embodiment of this application, the terminal equipment in the idle state or connected state can achieve the following effects: (1) When the UE does not need to download/upload data at high speed, and the signal quality of the SA cell is average, the UE can Residing in NSA cell/common LTE cell, saving UE power consumption. (2) When the signal quality of the SA cell is very good, the UE consumes less power, and the UE can reside in the SA cell. In this way, when the UE needs to download/upload data at high speed, the UE can quickly connect to 5G by accessing the SA cell or establishing an ENDC dual connection.

Optionally, a terminal device in the idle state or connected state can also achieve the following effects: in the NSA/SA mixed networking area, the UE dynamically switches between the SA cell and the NSA cell, and the signal icon displayed on the UE remains as 5G, The user is not aware of the network where the UE resides.

The following briefly describes how the terminal device displays signal icons.

The 5G NSA networking involves both 4G and 5G network standards, so the terminal equipment in the NSA networking method involves the switching display of 4G network icons and 5G network icons. See Table 1. GSMA, the Global System for Mobile Communications Association, submitted to 3GPP four schemes for displaying 5G network icons on CONFIG A/B/C/D terminals.

Table 1

Optionally, the terminal device in this embodiment of the present application may adopt the CONFIG D solution.

In the CONFIG D scheme, the terminal device will display the 5G network icon when it resides in the NSA cell. There are the following scenarios: In the NSA network, when a user uses a terminal device to process services, the terminal device displays a 5G network icon but actually has no NR connection. In this scenario, the terminal device can process services by establishing an ENDC dual connection, and the terminal device displays a 5G network icon, which prevents users from thinking that the terminal device is always on the 4G network and improves user experience.

The technical solution of the present application will be described in detail below through specific examples. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

The embodiments of the present application may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The terms "first", "second", "third", "fourth", etc. (if any) in the embodiments of the present application are used to distinguish similar objects, and not necessarily used to describe a specific order or sequence .

It should be noted that in the embodiments of this application, "/" means or. For example, switching from an SA cell to an NSA cell/normal LTE cell may be understood as: switching from an SA cell to an NSA cell, or switching from an SA cell to a normal LTE cell.

It should be noted that in this embodiment of the application, "switching" has a broad meaning and a narrow meaning. In a broad sense, the UE dynamically resides in different cells and changes from one cell to another. For example, UE handover from SA cell to NSA cell/normal LTE cell may include: UE in idle state reselects from SA cell to NSA cell/normal LTE cell, and UE in connected state switches from SA cell to NSA cell/normal LTE cell. In a narrow sense, it refers to a cell handover process triggered by reporting a measurement report when the UE is in the connected state. If the UE is in the connected state, the "handover" in the broad sense can be realized through the "cell handover process" in the narrow sense, and the "handover" in the broad sense can also be realized through the cell redirection process and the ENDC dual connection establishment process. If the UE is in an idle state, "handover" in a broad sense can be implemented through a cell reselection process and the like. Among them, the cell handover process, the cell reselection process, the cell redirection process, and the ENDC dual connection establishment process are all basic processes in the mobile communication network, which can be referred to the communication protocol.

It should be noted that, in the embodiment of the present application, the cell where the UE camps may be the cell where the UE in an idle state resides, or the cell that a UE in a connected state accesses.

In the following, with reference to FIGS. 5 to 8 , the process of handing over an existing terminal device from an SA cell to an NSA cell/common LTE cell will be described.

Exemplarily, FIG. 5 is a schematic diagram of a scenario where an existing terminal device is handed over from an SA cell to an NSA cell/common LTE cell. As shown in Fig. 5, UE1 and UE2 are currently camping on the SA cell. UE1 and UE2 can be in an idle state or in a connected state. The signal coverage of the SA cell is area 11, the signal coverage of the NSA cell/common LTE cell is area 21, and there is an overlapping area between area 11 and area 21. It should be noted that FIG. 5 is only an example, and does not limit signal coverage of SA cells, NSA cells, and common LTE cells. For example, in another implementation manner, the eNB and the gNB may be co-located base stations, and the central areas of area 11 and area 21 may overlap.

Optionally, in one scenario, the UE is in a connected state and is currently accessing an SA cell. With reference to FIG. 5 , (a) in FIG. 6 and FIG. 7 , the process of switching from an SA cell to an NSA cell/common LTE cell when the existing terminal equipment is in the connected state is described. As shown in Figure 7, it can include:

S701. The gNB sends measurement configuration information about the A2 event to the UE.

Correspondingly, the UE receives the measurement configuration information sent by the gNB. The measurement configuration information may include A2 event thresholds. This embodiment does not limit the specific value of the A2 event threshold. Optionally, the measurement configuration information may be transmitted through RRC signaling.

S702. The UE performs signal measurement on the SA cell. If the signal quality of the SA cell is lower than the A2 event threshold, a measurement report of the A2 event is reported. Correspondingly, the gNB receives the measurement report sent by the UE.

for example. See Figure 5. Suppose, A2 event threshold is -108dBm. UE2 detects that the signal quality of the SA cell is -109dBm, which is lower than -108dBm, and reports the measurement report of the A2 event. UE1 detects that the signal quality of the SA cell is -107dBm, if it is higher than -108dBm, it does not report the A2 event.

S703. The gNB sends measurement configuration information about the B1 event to the UE.

Correspondingly, the UE receives the measurement configuration information sent by the gNB. The measurement configuration information may include the B1 event inter-system neighbor cell threshold. This embodiment does not limit the specific value of the B1 event inter-system neighboring cell threshold. Optionally, the measurement configuration information may also include frequency points of cells of different systems (NSA cells and/or common LTE cells).

Specifically, after the UE reports the A2 event, it waits for the network side to configure the measurement of the different-system B1 event. After receiving the measurement configuration information about the B1 event, the UE performs signal measurement on neighboring cells of different systems.

S704. If the signal quality of the neighboring cell of the different system is higher than the threshold of the neighboring cell of the different system of the B1 event, report the measurement report of the B1 event. Correspondingly, the gNB receives the measurement report sent by the UE.

S705. The gNB determines the target cell according to the B1 event reported by the UE, and the UE executes a cell handover process.

Wherein, the cell handover process may be an existing handover process from an SA cell to an NSA cell/common LTE cell.

It can be seen that in the scenario where the UE in the connected state is handed over from the SA cell to the NSA cell/normal LTE cell, the signal quality of the SA cell needs to be lower than the A2 event threshold configured on the network side first, and the UE reports the A2 event to trigger the network side to configure the different system B1 event measurement. At present, due to the setting strategy of the network, the A2 event threshold is usually set at a low value, which makes it difficult for the UE to switch from the SA cell to the NSA cell/common LTE cell, and it is easier to camp in the SA cell. For example in the example in S702, UE1 in FIG. 5 will not report the A2 event and cannot be handed over. At this time, the power consumption of the UE residing in the SA cell is already very high, the mobile phone is seriously heated, and the battery life is shortened. Moreover, in S704, when reporting the B1 event, the UE reports all neighboring cells of different systems satisfying the B1 event, and the network side determines the target cell. The target cell may be an NSA cell or an ordinary LTE cell, which the UE cannot control. Refer to (a) in FIG. 6 for the handover result. If the target cell is an ordinary LTE cell, the signal icon displayed by the UE will change from 5G to 4G, affecting user experience.

Optionally, in another scenario, the UE is in an idle state and currently camps on the SA cell. With reference to FIG. 5 , (b) in FIG. 6 and FIG. 8 , the process of switching from an SA cell to an NSA cell/common LTE cell when the existing terminal equipment is in an idle state is described. As shown in Figure 8, can include:

S801. The UE is currently camping on the SA cell.

This step may be an existing cell selection process.

S802. The UE judges whether the signal quality of the currently camped SA cell is smaller than the serving cell threshold 1 for reselecting to a low-priority cell configured on the network side.

Wherein, the reselection from the SA cell to the LTE cell is generally considered as a low priority reselection, and conversely, the reselection from the LTE cell to the SA cell is considered a high priority reselection. In this embodiment, the specific value of the threshold 1 is not limited. If it is judged that the signal quality of the currently camped SA cell is smaller than the serving cell threshold 1 configured on the network side for reselecting to a low-priority cell, S803 is executed.

S803. The UE judges whether there is an NSA cell/common LTE cell whose signal quality is greater than the low-priority adjacent cell reselection threshold 2 configured on the network side.

Wherein, this embodiment does not limit the specific value of the low-priority adjacent cell reselection threshold 2 . If it is judged that there is an NSA cell/common LTE cell whose signal quality is greater than the low-priority adjacent cell reselection threshold 2 configured on the network side, perform S804.

S804. The UE performs a cell reselection procedure, and reselects to an NSA cell/common LTE cell.

This step may be an existing cell reselection process from an SA cell to an NSA cell/common LTE cell.

It can be seen that for the scene where the UE in the idle state is handed over from the SA cell to the NSA cell/normal LTE cell, the principle is similar to that when the UE is in the connected state, and both involve the local system signal threshold and the different system signal threshold configured on the network side. When the UE is in the connected state, the parameters involved include the A2 event threshold and the B1 event inter-system neighbor cell threshold. When the UE is in the idle state, the parameters involved include the serving cell threshold 1 for reselecting to a low-priority cell and the low-priority neighbor cell reselection threshold 2. When the UE is in the idle state, there are also the following problems: the UE is more likely to camp in the SA cell, resulting in increased power consumption, severe heat generation, and shortened battery life. Moreover, the UE cannot control whether the reselected cell is an NSA cell or a common LTE cell. Refer to (b) in FIG. 6 for the reselection result. If the reselected cell is a common LTE cell, the signal icon displayed by the UE will change from 5G to 4G, affecting user experience.

An embodiment of the present application provides a cell handover method, which is applicable to a scenario where a terminal device is handed over from an SA cell to an NSA cell/common LTE cell. In this embodiment, the UE can set a private threshold 1, which is greater than the A2 event threshold configured on the network side or the serving cell threshold 1 for reselecting to a low-priority cell. The UE can compare the signal quality of the SA cell with the private threshold 1. When the signal quality of the SA cell is lower than the private threshold 1, the terminal device can switch from the SA cell to the NSA cell/common LTE cell. By setting the private threshold 1, the handover judgment conditions of the system are relaxed when the terminal equipment is handed over from the SA cell to the LTE cell. When the signal quality of the SA cell is average or poor, it can be handed over to the LTE cell, saving UE power consumption and reducing Reduce UE heat and prolong battery life.

It should be noted that the specific value of the private threshold 1 is not limited in this embodiment.

A detailed description will be given below with reference to FIGS. 9 to 18 . Wherein, the same steps in various embodiments of the present application use the same numbers, and the same or similar concepts or processes may not be repeated in some embodiments.

Exemplarily, FIG. 9 is a schematic diagram of a scenario where a terminal device is handed over from an SA cell to an NSA cell/common LTE cell according to an embodiment of the present application. The difference between Figure 9 and Figure 5 is that in Figure 5, the terminal device can obtain the A2 event threshold configured on the network side or reselect to the serving cell threshold 1 of a low-priority cell, and compare the signal quality of the SA cell with it. The comparison is used as the switching judgment condition of the system. In Figure 9, the terminal device can obtain the A2 event threshold configured on the network side or the serving cell threshold 1 for reselecting to a low-priority cell, but compare the signal quality of the SA cell with the private threshold 1 set on the UE side, as this The switching judgment condition of the system. In Fig. 9, the signal quality of the SA cell detected by UE1 and UE2 is lower than the private threshold 1, and both can be handed over from the SA cell to the NSA cell/common LTE cell.

Optionally, in one scenario, the UE is in a connected state and is currently accessing an SA cell. As shown in Figure 11, the cell switching method provided in this embodiment may include:

S701. The gNB sends measurement configuration information about the A2 event to the UE.

S1102. The UE performs signal measurement on the SA cell. If the signal quality of the SA cell is lower than the private threshold 1, a measurement report of the A2 event is reported. Correspondingly, the gNB receives the measurement report sent by the UE.

for example. See Figure 9. Assume that the A2 event threshold is -108dBm, and the private threshold 1 is -106dBm. UE1 detects that the signal quality of the SA cell is -107dBm, although it is higher than -108dBm, but lower than -106dBm, UE1 can report the A2 event.

S703. The gNB sends measurement configuration information about the B1 event to the UE.

Optionally, the B2 event can also be used, then the gNB will send measurement configuration information about the B2 event to the UE.

S1104. The UE performs signal measurement on neighboring cells of different systems. If the signal quality of the neighboring cell of the different system is higher than the threshold 1, a measurement report of the B1 event is reported. Correspondingly, the gNB receives the measurement report sent by the UE.

Optionally, the B2 event can also be used. Then, if the signal quality of the SA cell is lower than the private threshold 1, and the signal quality of the adjacent cell of the different system is higher than the threshold 1, a measurement report of the B2 event is reported.

Optionally, in an implementation manner, the threshold value 1 may be the threshold of a B1 event inter-system neighboring cell. At this time, S1104 is the same as S704, and the judgment condition of switching between different systems is the same as that of the existing implementation. Similarly, if the B2 event is used, the threshold 1 may be the threshold of neighboring cells of different systems for the B2 event.

Optionally, in another implementation manner, the threshold 1 may be a private threshold 2 set by the UE, and the specific value of the private threshold 2 is not limited in this embodiment. By setting the private threshold 2, the UE can compare the signal quality of neighboring cells of different systems with the private threshold 2, and report the B1 event when it is higher than the private threshold 2, which improves the flexibility of the threshold setting for the UE to report the B1 event.

S705. The gNB determines the target cell according to the B1 event reported by the UE, and the UE executes a cell handover process.

Optionally, in another scenario, the UE is in an idle state and currently camps on the SA cell. As shown in Figure 12, the cell handover method provided in this embodiment may include:

S801. The UE is currently camping on the SA cell.

S1202. The UE judges whether the signal quality of the currently camped SA cell is lower than the private threshold 1 set by the UE.

If the signal quality of the SA cell is less than the private threshold 1, execute S1203.

S1203. The UE judges whether there is an NSA cell/common LTE cell whose cell signal quality is greater than threshold 1.

The UE can perform LTE measurement according to the network neighbor cell configuration, or perform LTE cell search autonomously. Optionally, the UE may autonomously perform LTE cell search according to historical frequency points, and the historical frequency points may include frequency points of LTE cells where the UE once camped. If there is an NSA cell/common LTE cell whose cell signal quality is greater than the threshold 1, perform S804.

Optionally, in an implementation manner, the threshold 1 may be the low priority neighbor cell reselection threshold 2 . At this time, S1203 is the same as S803.

Optionally, in another implementation manner, the threshold 1 may be a private threshold 2 set by the UE. The UE can compare the signal quality of the LTE cell with the private threshold 2, which improves the flexibility of threshold setting when the UE determines the target LTE cell.

S804. The UE performs a cell reselection procedure, and reselects to an NSA cell/common LTE cell.

Optionally, based on the embodiments shown in FIG. 11 and FIG. 12 , the UE may identify whether the LTE cell is an NSA cell or a normal LTE cell. When the UE performs LTE cell search or LTE cell signal measurement, it may first determine whether the NSA cell satisfies the cell handover condition. If there is an NSA cell that satisfies the cell handover condition, it will be handed over from the SA cell to the NSA cell, realizing autonomous selection of the UE to preferentially handover from the SA cell to the NSA cell. When the UE adopts the CONFIG D solution to display the signal icon, the signal icon is always 5G, which improves the user experience. If there is no NSA cell that meets the cell handover conditions, in one implementation, the UE does not perform handover, but still stays in the SA cell, and ensures that the signal icon is displayed as 5G; in another implementation, the UE can determine whether a common LTE cell is The cell switching condition is met, and if there is a common LTE cell that meets the cell switching condition, the SA cell is switched to a normal LTE cell to reduce the power consumption of the UE. See Figure 10 for the cell handover result. When the UE is in the connected state or the idle state, it can preferentially handover to the NSA cell.

Optionally, when the UE identifies whether the LTE cell is an NSA cell or a normal LTE cell, an implementation manner may include: the UE acquires current location information, and sends the location information to the cloud server. The cloud server determines the first NSA cell list within the preset geographical range according to the location information, and sends the first NSA cell list to the UE. Correspondingly, the UE receives the first NSA cell list, and identifies whether the LTE cell is an NSA cell according to the first NSA cell list. Wherein, the NSA cell list is stored on the cloud server. Optionally, the cloud server may update its stored NSA cell list periodically or triggered by an event. Optionally, the location information may include at least one of the following: latitude and longitude information, and a cell identity of a cell where the UE currently resides. This embodiment does not limit the way in which the UE acquires the location information. For example, positioning is performed through a global positioning system (global positioning system, GPS) component or a Beidou system positioning component installed on the UE.

Optionally, when the UE identifies whether the LTE cell is an NSA cell or a common LTE cell, another implementation manner may include: the UE identifies whether the LTE cell is an NSA cell according to historical information of the NSA cell. The NSA cell history information may include the NSA cells where the UE once camped. Specifically, for an LTE cell where the UE has camped, it can be determined whether the LTE cell is an NSA cell by identifying the upper layer indicator in the system message SIB2 or whether the ENDC dual connection has been established.

Optionally, if the UE is in the idle state, when the UE identifies whether the LTE cell is an NSA cell or a normal LTE cell, another implementation may include: the UE actively searches for an LTE cell, and determines the LTE cell by identifying the upper layer indicator in the system message SIB2. Whether the cell is an NSA cell.

Optionally, the private threshold 1 may include a private threshold 1a and a private threshold 1b, where the private threshold 1a>private threshold 1b, and the specific value is not limited in this embodiment. See Figure 15 and Figure 18 for details.

Optionally, the private threshold 2 may include a private threshold 2a and a private threshold 2b, where the private threshold 2a<private threshold 2b, and the specific value is not limited in this embodiment. The private threshold 2a is for NSA cells, and the private threshold 2b is for common LTE cells. Specifically, if the UE determines that there is an NSA cell whose signal quality is greater than the private threshold 2a, it switches from the SA cell to the NSA cell. Optionally, if the UE determines that there is no NSA cell whose signal quality is greater than the private threshold 2a, but there is a common LTE cell whose signal quality is greater than the private threshold 2b, then handover from the SA cell to the common LTE cell. By setting the private threshold 2a<private threshold 2b, the threshold value for the UE to switch to the NSA cell is reduced, making it easier for the UE to switch to the NSA cell, giving priority to guaranteeing the service rate, reducing the UE power consumption, and ensuring that the UE displays the 5G signal icon.

The implementation manners when the UE is in the connected state and the idle state will be described in detail below. Wherein, the UE is in the connected state in FIGS. 13 to 15 , and the UE is in the idle state in FIGS. 16 to 18 .

Optionally, in an implementation manner, referring to FIG. 13 , the UE is in a connected state. FIG. 13 shows an implementation manner of S1104 and S705 in FIG. 11 , and the execution subject is the UE. S1104 includes S1301 to S1302, and S705 may include S1303. In this embodiment, the UE in the connected state can be handed over from the SA cell to the NSA cell.

Specifically, S1301. The UE judges whether there is an NSA cell whose signal quality is higher than threshold 1.

If the signal quality of an NSA cell is higher than the threshold 1, execute S1302-S1303. If the signal quality of no NSA cell is higher than the threshold 1, perform S1304.

S1302. The UE reports a measurement report of the B1 event. Wherein, the measurement report includes NSA cells whose cell signal quality is higher than the threshold 1 .

After the UE reports the measurement report of the B1 event, the network side determines the target cell according to the measurement report. Since the NSA cell is included in the measurement report, the target cell is the NSA cell, and autonomous selection of the UE to preferentially handover from the SA cell to the NSA cell is realized.

S1303. The UE switches to the NSA cell.

S1304. The UE does not report the measurement report of the B1 event, and continues to camp on the SA cell.

Optionally, in another implementation manner, referring to FIG. 14 , the UE is in a connected state. FIG. 14 shows an implementation manner of S1104 and S705 in FIG. 11 , and the execution subject is the UE. S1104 includes S1301-S1302 and S1305-S1306, and S705 may include S1303 and S1307. In this embodiment, the UE in the connected state can switch from the SA cell to the NSA cell/common LTE cell, and preferentially switch to the NSA cell.

S1301. The UE judges whether there is an NSA cell whose signal quality is higher than threshold 1.

If the signal quality of an NSA cell is higher than the threshold 1, execute S1302-S1303. If the signal quality of no NSA cell is higher than the threshold 1, execute S1305-S1307.

S1302. The UE reports a measurement report of the B1 event. Wherein, the measurement report includes NSA cells whose cell signal quality is higher than the threshold 1 .

S1303. The UE switches to the NSA cell.

S1305. The UE judges whether there is a signal quality of a common LTE cell higher than the threshold 1.

If there are common LTE cells whose signal quality is higher than the threshold 1, execute S1306-S1307. If the signal quality of no common LTE cell is higher than threshold 1, execute S1304, the UE does not report the measurement report of the B1 event, and continues to camp on the SA cell.

S1306. The UE reports a measurement report of the B1 event. Wherein, the measurement report includes common LTE cells whose cell signal quality is higher than the threshold 1 .

S1307. The UE switches to a common LTE cell.

Optionally, in yet another implementation manner, referring to FIG. 15 , the UE is in a connected state. FIG. 15 shows an implementation manner of S1102, S1104 and S705 in FIG. 11, and the execution subject is the UE. S1102 may include S1308-S1309, S1104 may include S1301b-S1302b, S1305b-S1306b, and S1301a-S1302a, and S705 may include S1303b, S1307b, and S1303a. Wherein, S1301a-S1304a can refer to S1301-S1304 in FIG. 13 correspondingly, and S1301b-S1307b can refer to S1301-S1307 in FIG. 14 correspondingly. In this embodiment, the private threshold 1 may include a private threshold 1a and a private threshold 1b. When the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b, the UE can switch from the SA cell to the NSA cell. When the signal quality of the SA cell is lower than the private threshold 1b, the UE can switch from the SA cell to the NSA cell/common LTE cell, and hand over to the NSA cell preferentially.

Optionally, in yet another implementation manner, referring to FIG. 16 , the UE is in an idle state. Fig. 16 shows an implementation manner of S1203 and S804 in Fig. 12, and the execution subject is the UE. S1203 includes S1601, and S804 may include S1602. In this embodiment, the UE can reselect from the SA cell to the NSA cell.

Specifically, S1601. When the UE determines that the signal quality of the SA cell is lower than the private threshold 1, trigger the UE to search for the NSA cell. The UE judges whether there is an NSA cell whose signal quality is higher than threshold 1.

If the signal quality of an NSA cell is higher than the threshold 1, perform S1602. If the signal quality of no NSA cell is higher than threshold 1, perform S1603.

S1602. The UE reselects from the SA cell to the NSA cell.

S1603. The UE continues to camp on the SA cell.

Optionally, in yet another implementation manner, referring to FIG. 17 , the UE is in an idle state. Fig. 17 shows an implementation manner of S1203 and S804 in Fig. 12, and the execution subject is the UE. S1203 includes S1601 and S1604, and S804 may include S1602 and S1605. In this embodiment, the UE can reselect from the SA cell to the NSA cell/common LTE cell, and preferentially reselect to the NSA cell.

Specifically, S1601. When the UE determines that the signal quality of the SA cell is lower than the private threshold 1, trigger the UE to search for the NSA cell. The UE judges whether there is an NSA cell whose signal quality is higher than threshold 1.

If the signal quality of an NSA cell is higher than the threshold 1, perform S1602. If the signal quality of no NSA cell is higher than the threshold 1, execute S1604-S1605.

S1602. The UE reselects from the SA cell to the NSA cell.

S1604. The UE continues to search for common LTE cells. The UE judges whether there is a signal quality of a common LTE cell higher than threshold 1.

If there is a signal quality of a common LTE cell higher than the threshold 1, perform S1605. If the signal quality of no common LTE cell is higher than the threshold 1, perform S1603, and the UE continues to camp on the SA cell.

S1605. The UE reselects from the SA cell to the common LTE cell.

Optionally, in yet another implementation manner, referring to FIG. 18 , the UE is in an idle state. FIG. 18 shows an implementation manner of S1202, S1203 and S804 in FIG. 12, and the execution subject is the UE. S1202 may include S1308-S1309, S1203 may include S1601b, S1604b, and S1601a, and S804 may include S1602b, S1605b, and S1602a. Wherein, S1601a-S1603a can refer to S1601-S1603 in FIG. 16 correspondingly, and S1601b-S1605b can refer to S1601-S1605 in FIG. 17 correspondingly. In this embodiment, the private threshold 1 may include a private threshold 1a and a private threshold 1b. When the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b, the UE can reselect from the SA cell to the NSA cell. When the signal quality of the SA cell is lower than the private threshold 1b, the UE can reselect from the SA cell to the NSA cell/common LTE cell, and preferentially reselect to the NSA cell.

The following describes the process of handing over an existing terminal device from an NSA cell/common LTE cell to an SA cell or establishing an ENDC dual connection to connect to a 5G cell with reference to FIGS. 19 to 22 .

Exemplarily, FIG. 19 is a schematic diagram of a scenario where an existing terminal device is handed over from an NSA cell/normal LTE cell to an NR cell. As shown in Figure 19, UE1 and UE2 are currently camping on an NSA cell/common LTE cell. UE1 and UE2 can be in an idle state or in a connected state. The coverage of the NSA cell/common LTE cell is area 21, and the signal coverage of the NR cell is area 11. Wherein, in the area 12, the signal quality of the NR cell is very good, for example, greater than -95dBm, and this embodiment does not limit the threshold value for measuring the very good signal of the cell. Area 11 and area 21 overlap. UE1 is also located in area 11 , and UE2 is also located in area 12 . It should be noted that Fig. 19 does not limit the signal coverage of NR cells, NSA cells and common LTE cells.

Optionally, in a scenario, the UE is in a connected state and is currently accessing an NSA cell/common LTE cell. With reference to FIG. 19 , (a) in FIG. 20 and FIG. 21 , the process of switching from an NSA cell/common LTE cell to an NR cell when the existing terminal equipment is in the connected state is described. As shown in Figure 21, may include:

S2101. The eNB sends measurement configuration information about the B1 event to the UE.

Correspondingly, the UE receives the measurement configuration information sent by the eNB. The measurement configuration information may include the B1 event inter-system neighbor cell threshold. This embodiment does not limit the specific value of the B1 event inter-system neighboring cell threshold. Optionally, the measurement configuration information may also include a frequency point of a different system cell (NR cell). Optionally, the measurement configuration information may be transmitted through RRC signaling.

S2102. The UE performs signal measurement on the NR cell. If the signal quality of the NR cell is higher than the B1 event inter-system neighboring cell threshold, report the B1 event measurement report. Correspondingly, the eNB receives the measurement report sent by the UE.

for example. See Figure 19. Assume that the inter-system neighbor cell threshold for the B1 event is -106dBm. UE2 detects that the signal quality of the NR cell is -80dBm, which is higher than -106dBm, and reports the measurement report of the B1 event. UE1 detects that the signal quality of the NR cell is -105dBm, which is higher than -106dBm, and reports the measurement report of the B1 event.

S2103. The eNB determines the target cell according to the B1 event reported by the UE, and the UE switches from the NSA cell/common LTE cell to the NR cell.

Optionally, if the UE is currently camping on an NSA cell, the target cell may be a 5G cell connected to the NSA cell, and the UE may establish an ENDC dual connection with the target cell.

Optionally, if the UE is currently camping on an NSA cell, the target cell may be an SA cell, and the UE may switch to the SA cell through a cell redirection process or a cell handover process.

Optionally, if the UE is currently camping on a common LTE cell, the target cell may be an SA cell, and the UE may switch to the SA cell through a cell redirection procedure or a cell handover procedure.

Wherein, the cell handover procedure, the cell redirection procedure and the establishment of ENDC dual connectivity may all be existing procedures.

It can be seen that in the scenario where the UE in the connected state is handed over from an NSA cell/normal LTE cell to an NR cell, the signal quality of the NR cell needs to be higher than the B1 event inter-system neighboring cell threshold configured on the network side. At present, due to the setting strategy of the network, the threshold value of the B1 event inter-system neighboring cell is usually low, which makes it easy for the UE to handover from the NSA cell/normal LTE cell to the NR cell. For example in S2102, even if the signal quality of the NR cell where UE1 is located is not good, the B1 event can still be reported to complete the handover.

Optionally, in another scenario, the UE is in an idle state and is currently camping on an NSA cell/ordinary LTE cell. With reference to FIG. 19 , (b) in FIG. 20 and FIG. 22 , the process of switching from an NSA cell/common LTE cell to an SA cell when the existing terminal equipment is in the connected state is described. As shown in Figure 22, may include:

S2201. The UE is currently camping on an NSA cell/common LTE cell.

This step may be an existing cell selection process.

S2202. The UE determines whether there is an SA cell whose signal quality is greater than the high-priority adjacent cell reselection threshold 3 configured on the network side.

Wherein, the reselection from the SA cell to the LTE cell is generally considered as a low priority reselection, and conversely, the reselection from the LTE cell to the SA cell is considered a high priority reselection. In this embodiment, the specific value of the high-priority neighbor cell reselection threshold 3 is not limited. UE can perform NR measurement according to network neighbor configuration. If it is judged that there is an SA cell whose signal quality is greater than the high-priority adjacent cell reselection threshold 3, perform S2203.

S2203. The UE performs a cell reselection process, and reselects to the SA cell.

This step may be an existing cell reselection process from an SA cell to an NSA cell/common LTE cell.

It can be seen that for the scene where the UE in the idle state reselects from the NSA cell/normal LTE cell to the SA cell, the principle is similar to that when the UE is in the connected state, and both involve the inter-system signal threshold configured on the network side. When the UE is in the connected state, the parameters involved include the B1 event inter-system neighbor cell threshold. When the UE is in the idle state, the parameters involved include the high-priority neighbor cell reselection threshold 3. When the UE is in the idle state, there are also the following problems: the UE is more likely to camp in the SA cell, resulting in increased power consumption, severe heat generation, and shortened battery life.

An embodiment of the present application provides a cell handover method, which is applicable to a scenario where a terminal device is handed over from an NSA cell/normal LTE cell to an NR cell. In this embodiment, the UE may set a private threshold 3, which is greater than the threshold 3 for neighboring cells of different systems in the B1 event or the threshold 3 for reselecting neighboring cells with high priority configured on the network side. The UE can compare the signal quality of the NR cell with the private threshold 3. When the signal quality of the NR cell is higher than the private threshold 3, the terminal device can switch from the NSA cell/normal LTE cell to the NR cell scenario. By setting the private threshold 3, the handover judgment condition of different systems when the terminal equipment is handed over from the NSA cell/normal LTE cell to the NR cell is raised. When the signal quality of the NR cell is very good, it can be switched to the NR cell, which saves UE power consumption. , Reduce the heat generated by the UE and prolong the battery life. At the same time, the service rate is also improved.

It should be noted that the specific value of the private threshold 3 is not limited in this embodiment.

The details will be described below in conjunction with FIGS. 23 to 25 .

Exemplarily, FIG. 23 is a schematic diagram of a scenario where a terminal device is handed over from an NSA cell/normal LTE cell to an NR cell according to an embodiment of the present application. Compared with Figure 19, the difference between Figure 23 and Figure 19 is that in Figure 19, the terminal device can obtain the B1 event inter-system neighbor cell threshold or high-priority neighbor cell reselection threshold 3 configured on the network side, and compare the signal quality of the NR cell with the The comparison is used as the judgment condition for switching between different systems. In Figure 23, the terminal device can obtain the B1 event inter-system neighbor threshold or high-priority reselection neighbor threshold 3 configured on the network side, but compare the signal quality of the NR cell with the private threshold 3 set on the UE side as Judgment conditions for switching between different systems. In Figure 23, UE1 detects that the signal quality of the NR cell is lower than the private threshold 3, will not report the B1 event, and will not switch from the NSA cell/normal LTE cell to the NR cell. UE2 detects that the signal quality of the NR cell is higher than the private threshold 3, and can switch from the NSA cell/common LTE cell to the NR cell.

Optionally, in a scenario, the UE is in a connected state and is currently accessing an NSA cell/common LTE cell. As shown in Figure 24, the cell handover method provided in this embodiment may include:

S2101. The eNB sends measurement configuration information about the B1 event to the UE.

Optionally, the B2 event can also be used, then the gNB will send measurement configuration information about the B2 event to the UE.

S2402. The UE performs signal measurement on the NR cell. If the signal quality of the NR cell is higher than the private threshold 3, report the measurement report of the B1 event. Correspondingly, the eNB receives the measurement report sent by the UE.

Optionally, the B2 event can also be used. Then, if the signal quality of the NSA cell/common LTE cell is lower than the B2 event service cell threshold, and the NR cell signal quality is higher than the private threshold 3, report the B2 event measurement report.

S2103. The eNB determines the target cell according to the B1 event reported by the UE, and the UE switches from the NSA cell/common LTE cell to the NR cell.

Optionally, in another scenario, the UE is in an idle state and is currently camping on an NSA cell/ordinary LTE cell. As shown in Figure 25, the cell handover method provided in this embodiment may include:

S2201. The UE is currently camping on an NSA cell/common LTE cell.

S2502. The UE judges whether there is an SA cell whose cell signal quality is greater than the private threshold 3.

The UE can perform NR measurement according to the network neighbor configuration, or perform SA cell search autonomously. Optionally, the UE may autonomously perform SA cell search according to historical frequency points, and the historical frequency points may include frequency points of SA cells where the UE once camped. If there is an SA cell whose cell signal quality is greater than the private threshold 3, perform S2203.

S2203. The UE performs a cell reselection process, and reselects to the SA cell.

Optionally, this embodiment of the present application further provides a cell handover method, which is applicable to a scenario where a terminal device needs to quickly handover from a common LTE cell to an NR cell. In this embodiment, the UE is currently camping on a common LTE cell, and may be in a connected state or an idle state. When the UE needs to quickly switch from a normal LTE cell to an NR cell, the UE can actively initiate a handover process from a normal LTE cell to an NR cell. The UE may set a private threshold 4, which is smaller than the private threshold 3. In this embodiment, the specific value of the private threshold 4 is not limited. When the UE determines the target NR cell, it can compare the signal quality of the NR cell with the private threshold 4. When the signal quality of the NR cell is higher than the private threshold 4, the terminal device can switch from the normal LTE cell to the NR cell. By setting the private threshold 4, the service rate requirement is met on the basis of fast handover of the terminal equipment from the common LTE cell to the NR cell.

As shown in Figure 26, the cell handover method provided in this embodiment may include:

S2601. The UE runs a whitelist application in the foreground.

Wherein, the whitelist application program may be an application program for performing heavy traffic services, for example, a video application program, a data download application program, a speed measurement application, and the like.

It should be noted that, S2601 is a preset condition for the terminal device to determine that it needs to quickly switch from a common LTE cell to an NR cell, and may also be other preset conditions, which are not limited in this embodiment. For example, the UE determines that the data volume of the data to be uploaded or the data to be downloaded is greater than a preset value. For another example, the UE determines that the data to be transmitted has high requirements on time delay.

S2602. If the UE is in a connected state, perform an L2NR re-establishment process, and switch from a normal LTE cell to an NR cell.

Among them, the implementation of the L2NR re-establishment process is: the terminal initiates the re-establishment process at the 4G access layer according to the standard protocol. Specifically, it first releases the RRC link and the layer 3/layer 2 data connection locally, and then starts the cell search. Prioritize the search for NR cells. If a qualified NR cell is found, the UE initiates an access procedure in the NR cell and re-establishes an RRC connection. If no qualified NR cell is found, the UE searches for an LTE cell and performs (It may be the original serving cell, or it may not be, and there is no regulation) to complete the re-establishment process and re-establish the RRC connection. In the L2NR re-establishment procedure in this embodiment, when the UE determines the target NR cell, it may compare the signal quality of the NR cell with the private threshold 4. Through the L2NR re-establishment process, the UE can initiate a handover from a common LTE cell to an NR cell, which shortens the handover delay.

S2603. If the UE is in an idle state, trigger a search for an NR cell.

Specifically, the UE may autonomously perform NR cell search according to historical frequency points, and the historical frequency points may include the frequency points of NR cells where the UE once camped.

S2604. If there is an NR cell whose signal strength is higher than the private threshold 4, the UE accesses the NR cell.

It can be understood that, in order to realize the above functions, the terminal device includes hardware and/or software modules corresponding to each function. Combining the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions in combination with the embodiments for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

The embodiment of the present application may divide the terminal device into functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. It should be noted that the division of modules in the embodiment of the present application is schematic, and is only a logical function division, and there may be other division methods in actual implementation. It should be noted that the names of the modules in the embodiments of the present application are illustrative, and the names of the modules are not limited during actual implementation.

In the case of dividing each functional module corresponding to each function, FIG. 27 is a schematic structural diagram of a terminal device provided in an embodiment of the present application. As shown in FIG. 27 , the terminal device may include: a communication module 2701 and a processing module 2702 .

Communication module 2701, configured to send data to other devices or receive data from other devices. For example, receiving system information, receiving measurement configuration information of A2 event, measurement configuration information of B1 event, measurement configuration information of B2 event, sending measurement report of A2 event, sending measurement report of B1 event, or sending measurement report of B2 event.

The processing module 2702 is used to detect the signal quality of the current serving cell, detect the signal quality of a cell in a different system, search for a cell, determine the target cell for handover, determine the target cell for reselection, or execute the cell reselection process, cell handover process, establishment ENDC dual connectivity, etc.

It should be noted that all relevant content of the steps involved in the above method embodiments can be referred to the function description of the corresponding function module, and will not be repeated here.

Please refer to FIG. 28 , which shows another structure of a terminal device provided by an embodiment of the present application. The terminal device includes: a processor 2801 , a receiver 2802 , a transmitter 2803 , a memory 2804 and a bus 2805 . The processor 2801 includes one or more processing cores, and the processor 2801 executes various functional applications and information processing by running software programs and modules. The receiver 2802 and the transmitter 2803 can be implemented as a communication component, and the communication component can be a baseband chip. The memory 2804 is connected to the processor 2801 through the bus 2805 . The memory 2804 may be used to store at least one program instruction, and the processor 2801 may be used to execute the at least one program instruction, so as to implement the technical solutions of the foregoing embodiments. Its implementation principle and technical effect are similar to those of the related embodiments of the method above, and will not be repeated here.

When the terminal is turned on, the processor can read the software program in the memory, interpret and execute the instructions of the software program, and process the data of the software program. When it is necessary to send data (for example, the measurement report of the A2 event) through the antenna, the processor outputs the baseband signal to the control circuit in the control circuit after performing baseband processing on the data to be sent, and the control circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency The signal is sent out in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the control circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art can understand that, for ease of illustration, FIG. 28 only shows a memory and a processor. In an actual terminal, there may be multiple processors and memories. A storage may also be called a storage medium or a storage device, etc., which is not limited in this embodiment of the present application.

As an optional implementation manner, the processor may include a baseband processor and a central processing unit, the baseband processor is mainly used for processing communication data, and the central processing unit is mainly used for executing software programs and processing data of the software programs. Those skilled in the art can understand that the baseband processor and the central processing unit may be integrated into one processor, or may be independent processors interconnected through technologies such as a bus. Those skilled in the art can understand that the terminal may include multiple baseband processors to adapt to different network standards, the terminal may include multiple central processors to enhance its processing capability, and various components of the terminal may be connected through various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data can be built in the processor, or can be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function. The memory can be integrated in the processor, or it can be independent from the processor. The memory includes a high-speed cache, which can store frequently accessed data/instructions.

In this embodiment of the application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or Execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SS), or a volatile memory (volatile memory), such as random-access memory (RAM). A memory is, without limitation, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data. The methods provided in the various embodiments of the present application may be fully or partially implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL) or wireless (such as infrared, wireless, microwave, etc.). The computer can The read storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape) , an optical medium (eg, digital video disc (digital video disc, DWD), or a semiconductor medium (eg, SSD), etc.

An embodiment of the present application provides a computer program product, which enables the terminal to execute the technical solutions in the foregoing embodiments when the computer program product is run on a terminal. Its implementation principle and technical effect are similar to those of the above-mentioned related embodiments, and will not be repeated here.

An embodiment of the present application provides a computer-readable storage medium, on which program instructions are stored. When the program instructions are executed by a terminal, the terminal executes the technical solutions of the foregoing embodiments. Its implementation principle and technical effect are similar to those of the above-mentioned related embodiments, and will not be repeated here. In summary, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still The technical solutions described in the foregoing embodiments are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (22)

1. A cell handover method applied to a communication device, the communication device residing in an independent networking SA cell and being in a connected state, the method comprising:

receiving measurement configuration information of an A2 event, wherein the measurement configuration information of the A2 event comprises an A2 event threshold;

performing signal measurement on the SA cell, and if the signal quality of the SA cell is lower than a first private threshold, sending a first measurement report of the A2 event; the first private threshold is set by the communication device and is higher than the A2 event threshold, the first private threshold comprises a private threshold 1a and a private threshold 1b, and the private threshold 1a > the private threshold 1b;

receiving measurement configuration information of a different system measurement event, wherein the measurement configuration information of the different system measurement event comprises information of a Long Term Evolution (LTE) adjacent cell of the SA cell;

performing signal measurement on the LTE adjacent cell, and sending a second measurement report; wherein the signal quality of the LTE cell in the second measurement report is above a first threshold;

switching from the SA cell to a target cell through a cell switching process, wherein the target cell is one of the LTE cells;

before the sending of the second measurement report, further comprising:

determining that the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b;

or,

determining that the signal quality of the SA cell is lower than the private threshold 1b.

2. The method of claim 1, wherein in case that the signal quality of the SA cell is lower than the private threshold 1a and higher than the private threshold 1b, the performing signal measurement on the LTE neighbor cell and sending a second measurement report comprises:

acquiring anchor LTE cell information;

performing signal measurement on the anchor LTE cell in the LTE neighboring cell according to the anchor LTE cell information;

if the signal quality of the anchor LTE cell in the LTE adjacent cell is higher than the first threshold value, sending the second measurement report; the LTE cell and the target cell are anchor LTE cells.

3. The method of claim 1, wherein in case that the signal quality of the SA cell is lower than the private threshold 1b, the performing signal measurement on the LTE neighbor cell and sending a second measurement report comprises:

acquiring anchor LTE cell information;

performing signal measurement on the anchor LTE cell in the LTE neighboring cell according to the anchor LTE cell information;

if the signal quality of the anchor LTE cell in the LTE adjacent cell is higher than the first threshold value, sending the second measurement report; the LTE cell and the target cell are anchor LTE cells;

if the signal quality of the LTE cell without the anchor point in the LTE adjacent cell is higher than the first threshold value, performing signal measurement on a common LTE cell in the LTE adjacent cell;

if the signal quality of the common LTE cell in the LTE adjacent cell is higher than the first threshold value, sending the second measurement report; the LTE cell and the target cell are both common LTE cells.

4. The method of claim 2 or 3, wherein the obtaining anchor LTE cell information comprises:

transmitting location information of the communication device to a cloud server;

receiving the anchor LTE cell information sent by the cloud server;

and/or the presence of a gas in the atmosphere,

obtaining the anchor LTE cell information, wherein the anchor LTE cell information comprises information of an anchor LTE cell in which the communication device was camped.

5. The method of claim 1, wherein the measurement configuration information of the inter-system measurement event comprises measurement configuration information of a B1 event or measurement configuration information of a B2 event.

6. The method of claim 1, wherein the first threshold comprises any one of: a B1 event inter-system neighbor cell threshold, a B2 event inter-system neighbor cell threshold, or a second private threshold, where the second private threshold is set by the communication device.

7. A cell handover method applied to a communication device, the communication device residing in an independent networking SA cell and being in an idle state, the method comprising:

triggering to search for a Long Term Evolution (LTE) cell when detecting that the signal quality of the SA cell is lower than a first private threshold; the first private threshold is higher than a serving cell threshold configured by a network side and reselected to a low-priority cell, and the LTE cell comprises an anchor LTE cell and/or a common LTE cell;

if the target cell is searched, reselecting the SA cell to the target cell through a cell reselection process; the target cell is one of the LTE cells, and the signal quality of the target cell is higher than a first threshold value.

8. The method of claim 7, wherein searching for the target cell comprises:

acquiring anchor LTE cell information;

searching an anchor LTE cell according to the anchor LTE cell information;

if the signal quality of the anchor LTE cell is higher than the first threshold value, determining that a target cell is searched; the target cell is an anchor LTE cell.

9. The method of claim 8, further comprising:

if the signal quality of the LTE cell without the anchor point is higher than the first threshold value, searching the common LTE cell;

if the signal quality of the common LTE cell is higher than the first threshold value, determining that a target cell is searched; the target cell is a common LTE cell.

10. The method of claim 8, wherein the first private threshold comprises a private threshold 1a and a private threshold 1b, and wherein the private threshold 1a > the private threshold 1b;

before the determining to search the target cell, the method further includes:

determining that the signal quality of the SA cell is below the private threshold 1a and above the private threshold 1b.

11. The method of claim 9, wherein the first private threshold comprises a private threshold 1a and a private threshold 1b, and wherein the private threshold 1a > the private threshold 1b;

before the determining to search the target cell, the method further includes:

determining that the signal quality of the SA cell is below the private threshold 1b.

12. The method of any of claims 8-11, wherein the obtaining anchor LTE cell information comprises:

transmitting location information of the communication device to a cloud server;

receiving the anchor LTE cell information sent by the cloud server;

and/or the presence of a gas in the atmosphere,

acquiring the anchor LTE cell information, wherein the anchor LTE cell information comprises information of an anchor LTE cell where the communication device resides;

and/or the presence of a gas in the atmosphere,

receiving a system message of an LTE cell, wherein the system message comprises a cell indicating whether the LTE cell is an anchor LTE cell;

and acquiring the anchor LTE cell information according to the cell.

13. The method of claim 7, wherein the first threshold comprises any one of: a threshold of a neighboring cell reselected with low priority or a second private threshold, where the threshold of the neighboring cell reselected with low priority is configured by a network side, and the second private threshold is set by the communication device.

14. A cell switching method is applied to a communication device, the communication device resides in a Long Term Evolution (LTE) cell and is in a connected state, the LTE cell is an anchor LTE cell or a common LTE cell, and the method comprises the following steps:

receiving measurement configuration information of a B1 event or a B2 event, wherein the measurement configuration information of the B1 event or the B2 event comprises information of a new air interface NR neighboring cell of the LTE cell;

performing signal measurement on the NR neighboring cell, and sending a first measurement report; wherein the signal quality of the NR cell in the first measurement report is higher than a third private threshold, the third private threshold being set by the communication apparatus, and the third private threshold being higher than a B1 event inter-system neighbor threshold or a B2 event inter-system neighbor threshold;

and establishing connection with a target NR cell, wherein the target NR cell is one of the NR cells.

15. The method of claim 14, wherein the LTE cell is a normal LTE cell, and wherein establishing a connection with a target NR cell comprises:

and switching from the common LTE cell to the target NR cell through a cell switching process, wherein the target NR cell is an independent networking SA cell.

16. The method of claim 14, wherein the LTE cell is an anchor LTE cell, and wherein establishing a connection with a target NR cell comprises:

switching from the anchor LTE cell to the target NR cell through a cell switching process, wherein the target NR cell is an SA cell; or,

establishing a dual-connectivity ENDC dual-connectivity for 4G-5G wireless access with the target NR cell, the target NR cell being an NR cell connected with the anchor LTE cell.

17. A cell switching method is applied to a communication device, the communication device resides in a Long Term Evolution (LTE) cell and is in an idle state, the LTE cell is an anchor LTE cell or a common LTE cell, and the method comprises the following steps:

searching an independent networking SA cell;

if the target SA cell is searched, reselecting the LTE cell to the target SA cell through a cell reselection process; the signal quality of the target SA cell is higher than a third private threshold, where the third private threshold is set by the communication device and is higher than a neighboring cell threshold configured by the network side for high-priority reselection.

18. The method of claim 17, wherein the searching for an SA cell for independent networking comprises:

obtaining an SA (system access) neighbor cell of the LTE cell;

and searching the SA cell according to the SA neighboring cell.

19. The method of claim 17, wherein searching for an independent networking (SA) cell comprises:

acquiring frequency points of an SA cell, wherein the frequency points of the SA cell comprise the frequency points of the SA cell where the communication device resides;

and searching the SA cell according to the frequency point of the SA cell.

20. A communication device comprising a processor configured to couple with a memory, and to read instructions from the memory and to cause the communication device to perform the method of any one of claims 1-19 according to the instructions.

21. The communication device of claim 20, wherein the communication device is a terminal or a chip.

22. A computer-readable storage medium having stored thereon computer instructions which, when executed on an electronic device, cause the electronic device to perform the method of any one of claims 1-19.

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