CN113170367A - Method for switching network equipment and terminal equipment - Google Patents

Abstract

The embodiment of the application discloses a method and terminal equipment for switching network equipment, wherein the method comprises the following steps: the method comprises the steps that terminal equipment receives a Radio Resource Control (RRC) connection reconfiguration message sent by source network equipment; and under the condition that the channel quality of the target network equipment and/or the source network equipment meets the switching condition, the terminal equipment initiates switching to the target network equipment and does not send an RRC connection reconfiguration completing message aiming at the RRC connection reconfiguration message to the source network equipment based on a condition switching command. The method and the terminal equipment in the embodiment of the application are beneficial to reducing the signaling overhead.

Description

Method for switching network equipment and terminal equipment Technical Field

The embodiment of the application relates to the field of communication, in particular to a method for switching network equipment and terminal equipment.

Background

In the prior art, if a network side configures a conditional handover (conditional handover), a terminal device usually replies a corresponding Radio Resource Control (RRC) connection reconfiguration complete message to the network side after receiving a RRC connection reconfiguration message sent by a source network device, and then determines whether to initiate handover based on measurement of channel quality. There may be a problem in the prior art that signaling overhead is wasted.

Disclosure of Invention

The embodiment of the application provides a method for switching network equipment and terminal equipment, which are beneficial to reducing signaling overhead.

In a first aspect, a method for switching network devices is provided, and the method includes: the method comprises the steps that terminal equipment receives a Radio Resource Control (RRC) connection reconfiguration message sent by source network equipment; and under the condition that the channel quality of the target network equipment and/or the source network equipment meets the switching condition, the terminal equipment initiates switching to the target network equipment and does not send an RRC connection reconfiguration completing message aiming at the RRC connection reconfiguration message to the source network equipment based on a condition switching command.

In a second aspect, a terminal device is provided for executing the method of the first aspect or its implementation manner.

In particular, the terminal device comprises functional modules for performing the method of the first aspect or its implementation.

In a third aspect, a terminal device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method of the first aspect or the implementation manner thereof.

In a fourth aspect, a chip is provided for implementing the method in the first aspect or its implementation manners.

Specifically, the chip includes: a processor configured to call and run the computer program from the memory, so that the device on which the chip is installed performs the method according to the first aspect or the implementation manner thereof.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program, which causes a computer to execute the method of the first aspect or its implementations.

A sixth aspect provides a computer program product comprising computer program instructions for causing a computer to perform the method of the first aspect or its implementations.

In a seventh aspect, a computer program is provided, which, when run on a computer, causes the computer to perform the method of the first aspect or its implementations.

By the technical scheme, under the condition of configuring the condition switching, after the RRC connection reconfiguration message is received, whether the channel quality meets the switching condition can be determined, and under the condition of meeting the switching condition, the switching is directly performed, so that a corresponding RRC connection reconfiguration completion message does not need to be sent to a network side, and the signaling overhead is reduced.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of a handover procedure provided in an embodiment of the present application.

Fig. 3 is a schematic diagram of a conditional switching procedure provided in an embodiment of the present application.

Fig. 4 is a schematic block diagram of a method for switching a network device according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a method for switching a network device according to an embodiment of the present disclosure.

Fig. 6 is a schematic diagram of a method for switching a network device according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram of a method for switching a network device according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a method for switching a network device according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

Fig. 11 is a schematic block diagram of a chip provided in an embodiment of the present application.

Fig. 12 is a schematic diagram of a communication system provided in an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be understood that the technical solutions of the embodiments of the present application may be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a long term evolution LTE System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile telecommunications System (Universal Mobile telecommunications System, UMTS), a UMTS Worldwide Interoperability for Microwave Access (WiMAX) communication System, a New Radio (New Radio, NR), a future 5G System, and the like.

In particular, the technical solution of the embodiment of the present application may be applied to various communication systems based on a non-orthogonal Multiple Access technology, such as a Sparse Code Multiple Access (SCMA) system, a Low Density Signature (LDS) system, and the like, and certainly the SCMA system and the LDS system may also be called other names in the communication field; further, the technical solution of the embodiment of the present application may be applied to a Multi-Carrier transmission system using a non-Orthogonal multiple access technology, for example, an Orthogonal Frequency Division Multiplexing (OFDM) using a non-Orthogonal multiple access technology, a Filter Bank Multi-Carrier (FBMC), a General Frequency Division Multiplexing (GFDM), a Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) system, and the like.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a Mobile switching center, a relay Station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network device gNB in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal Equipment" includes, but is not limited to, User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, and the embodiments of the present invention are not limited thereto.

Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

Alternatively, the 5G system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may further include other devices in the communication system 100, such as a Mobility Management Entity (MME), a Serving Gateway (S-GW), a packet data Gateway (PDN Gateway, P-GW), and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

For ease of understanding, the handover procedure in the existing LTE system will be described in detail below with reference to fig. 2. As shown in fig. 2, the handover procedure mainly includes three processes of handover preparation, handover execution, and handover completion, and specifically includes the following partial or all steps:

s201, the source eNB carries out measurement configuration on the UE, and the measurement result of the UE is used for assisting the source eNB to carry out switching judgment.

S202, the UE carries out measurement reporting according to the measurement configuration.

S203, the source eNB refers to the measurement report result of the UE and carries out switching judgment according to the switching algorithm of the source eNB.

S204, the source eNB sends a handover request message to the target eNB, wherein the handover request message includes related information of handover preparation, mainly including X2 and S1 signaling context reference of the UE, a target cell identifier, a security key, a Radio Resource Control (RRC) context, Access Stratum (AS) configuration, Evolved-Universal mobile telecommunications system Terrestrial Radio Access (E-UTRAN) Radio Access Bearer (E-UTRAN Radio Access Bearer, E-RAB) context, and the like. And simultaneously, the method also comprises a source cell physical layer identifier and a message authentication verification code, and is used for a recovery process after possible switching failure. The X2 and S1 signaling context references of the UE may help the target eNB find the location of the source eNB. The E-RAB context includes necessary Radio Network Layer (RLN) and Transport Layer (TNL) addressing information, Quality of Service (QoS) information of the E-RAB, and the like.

S205: and the target eNB carries out admission control according to the received E-RAB QoS information so as to improve the success rate of switching. The admission control considers reserving corresponding resources, Cell Radio Network Temporary Identifier (C-RNTI), allocating dedicated random access Preamble codes, and the like. The AS configuration used by the target cell may be a complete configuration completely independent of the source cell, or an incremental configuration based on the source cell (the incremental configuration refers to that the same part is not configured, and different parts are reconfigured only by signaling, and the UE will continue to use the original configuration for the configuration that is not received).

S206: the target eNB prepares for the handover at L1/L2 and sends a handover request ACK message to the source eNB. The message contains an RRC container, and the specific content is a handover command that triggers the UE to perform handover. And the source eNB switching command is transmitted to the UE in a transparent transmission mode (without any modification). The handover command includes a new C-RNTI and a case algorithm identifier of the target eNB, and may also carry a random access dedicated Preamble code, an access parameter, system information, and the like. It is also possible to carry RNL/TNL information in the handover request ACK message for data forwarding if necessary. When the source eNB receives the handover request ACK message or forwards the handover command to the UE, data forwarding may be started.

S207: the handover command (RRC connection reconfiguration message carrying mobility control information) is generated by the target eNB and passed through to the UE by the source eNB. The source eNB performs the necessary ciphering and integrity protection for this message. After receiving the message, the UE initiates a handover procedure using the relevant parameters in the message. The UE may initiate a handover procedure without waiting for a Hybrid Automatic Repeat reQuest (HARQ)/Automatic Repeat reQuest (ARQ) response sent by a lower layer to the source eNB.

S208: the source eNB sends a Sequence Number (SN) state transmission message to the target eNB, and transmits an uplink Packet Data Convergence Protocol (PDCP) SN receiving state and a downlink PDCP SN sending state of the E-RAB. The uplink PDCP SN reception status includes at least the PDCP SN of the last uplink SDU received in-sequence, and may also include the SNs of missing uplink SDUs that cause reception out-of-sequence, expressed in the form of a bit map (if any, may require retransmission by the UE in the target cell). The downlink PDCP SN transmission status indicates the next SDU sequence number that should be assigned at the target eNB. The source eNB may omit this message if no E-RAB needs to deliver a status report for PDCP.

S209: after receiving the switching command, the UE executes the synchronization with the target cell, if the special Preamble code for random access is configured in the switching command, the UE accesses the target cell by using the non-competitive random access process, and if the special Preamble code is not configured, the UE accesses the target cell by using the competitive random access process. The UE calculates the key to be used at the target eNB and configures the security algorithm selected by the network for use at the target eNB for communication with the target eNB after the handover is successful.

S210: the network replies with an uplink resource allocation indication and a timing advance.

S211: and after the UE is successfully accessed into the target cell, the UE sends an RRC connection reconfiguration completion message and confirms the completion of the switching process to the target eNB. The message may also be accompanied by an improvement in the Buffer Status Report (BSR) if resources allow. And the target eNB confirms that the switching is successful by receiving the RRC connection reconfiguration finishing message. To this end, the target eNB may start transmitting data to the UE.

S212: the target eNB sends a path switch request message to the MME to inform the UE that the cell has been changed. At this point, the air interface switch is successfully completed.

S213: MME sends a user plane update request message to S-GW.

S214: and the S-GW switches the downlink data path to the target eNB side. The S-GW sends one or more end marker (end marker) packets to the source eNB on the old path, and then may release the user plane resources of the source eNB.

S215: and the S-GW sends a user plane update response message to the MME.

S216: the MME sends a path switch request ACK message to the target eNB. Steps 12-16 complete the path switching procedure, which is intended to switch the user plane data path from the source eNB to the target eNB. After the S-GW switches the downlink path, the downlink packets of the forwarded path and the new path may arrive at the target eNB alternately. The target eNB should first deliver all forwarded packets to the UE and then deliver the packets received from the new path. The use of this method at the target eNB may force a guarantee of the correct transmission order. To assist the reordering function at the target eNB, the S-GW sends one or more "end marker packets" on the old path immediately after the E-RAB switch path. The "end marker packet" contains no user Data and is indicated by the generic Data Transfer Platform (GTP) header. After completing the transmission of the packet containing the identifier, the S-GW should not transmit any data packet on the old path. After receiving the "end marker packet", the source eNB should send this packet to the target eNB if forwarding is active for this bearer. After perceiving the "end marker packet", the target eNB should discard the "end marker packet" and initiate any necessary procedures to maintain the in-order delivery of the users, which data is forwarded through X2 port or received from the S-GW through S1 port after path switching.

S217: the target eNB sends UE context release information to the source eNB, informs the source eNB of the success of switching and triggers the resource release of the source eNB. The target eNB sends this message after receiving the path switch ACK message sent back from the MME.

S218: after receiving the UE context release message, the source eNB may release the radio bearer and the control plane resources related to the UE context. Any ongoing data forwarding (data forwarding) will continue.

However, for some special scenarios, such as high-speed UE movement or high-frequency UE conditions, frequent Handover (HO) of the UE is required, and therefore, a new handover procedure, namely Conditional handover (Conditional handover), is proposed. The conditional switch avoids the problem that the time for switching preparation is too long, which causes the time for switching the UE to be late, and can configure an HO command (command) for the UE in advance. On the other hand, for a high-speed rail scene, the operation track of the UE is specific, so the source base station may allocate the target base station to the UE in advance, and include a condition for triggering the UE to perform handover in the HO command, and when the allocated condition is satisfied, the UE initiates an access request to the target base station.

Specifically, the 3GPP RAN2#104 conference has agreed to such conditional handover, and supports configuration of a plurality of target cells in HO command in the flow of the conditional handover. For example, fig. 3 shows a schematic diagram of a partial conditional handover procedure. For the sake of distinction from the handover shown in fig. 2 described above, the handover procedure corresponding to fig. 2 described above is referred to as normal handover (normal HO) in the present application.

As shown in fig. 3, in S301, the UE reports the measurement report to the source eNB, similar to the ordinary handover procedure, where S301 may correspond to S201 and S202 in the ordinary handover procedure shown in fig. 2, and for brevity, no further description is given here.

S302, switching preparation is carried out between the source eNB and the target eNB, which is similar to the ordinary switching process. In particular, the source eNB may perform handover preparation with one or more target enbs, e.g., the source eNB may send a handover request to the one or more target enbs. The handover preparation step performed between the source eNB and any one of the target enbs in S302 may correspond to S203 and S204 in the ordinary handover process shown in fig. 2, and for brevity, no further description is given here.

S303, the handover command, where the handover command is sent by the source eNB to the UE, may configure multiple target cells or multiple target enbs, optionally, may also configure a condition for the UE to perform handover, for example, the handover condition may include information such as a cell or a beam state, so that the UE determines which target cell or target eNB to access based on the configured condition (condition).

And S304, when the switching condition is met, performing random access. The UE determines whether the configured target cells or target enbs satisfy the handover condition according to the configured condition (condition), and performs random access when a certain target cell or target eNB satisfies the condition.

In order to distinguish the normal handover from the handover command in the conditional handover, the handover command in the conditional handover may be defined as the conditional handover command.

Before handover, the network side usually configures a measurement condition or a handover condition to the terminal device for determining whether to perform handover. The measurement refers to mobility measurement in a connected state.

In normal handover, the network device may send measurement configuration information to the terminal device through an RRC message, and the terminal device detects a signal quality state of the current serving cell and/or the neighboring cell according to parameters such as a measurement object and a reporting configuration indicated in the measurement configuration information, and reports a measurement report to the network device according to a trigger mode in the reporting configuration.

A measurement configuration database VarMeasConfig is usually maintained on the terminal equipment side, in which there is one measObjectId and one reportConfigId for each measId. Wherein the measId is a database measurement configuration entry index; the measObjectId is a measurement object identifier and corresponds to a measurement object configuration item; the reportConfigId is a measurement report identifier and corresponds to a measurement report configuration item. And the method also comprises a common configuration item quantityConfig irrelevant to the measId, measurement configuration, s-measure, serving cell quality threshold control and the like.

The measurement object is a single E-UTRA carrier frequency for the same frequency and different frequency measurement of the evolution Universal Terrestrial Radio Access (E-UTRA). The E-UTRA may configure a list of cell offsets (offsets) and a blacklisted cell list for the cell associated with the carrier frequency. No operation is performed on the blacklisted cells in the measurement evaluation and measurement report.

The reporting configuration is divided into event triggered reporting and cycle triggered reporting according to types, each reporting configuration has a separate identifier, and the event triggered reporting configuration includes an event type, a threshold value, and a duration (Time to Trigger, TTT) that meets a triggering condition, and the TTT may also be referred to as a triggering Time. The reporting configuration of the periodic trigger type includes a reporting period and a purpose of periodic triggering.

The common/different frequency measurement events in the current LTE system include the following:

event A1: the serving cell is above an absolute threshold (serving > threshold);

event A2: serving cell is below a decision threshold (serving < threshold);

event A3: the adjacent cell is higher than the main cell/the main and auxiliary cells by an offset;

event A4: neighbor cells are above an absolute threshold (neighbor > threshold);

event A5: the primary/secondary cell is below an absolute threshold 1 and the neighbor/secondary cell is above another absolute threshold 2;

event A6: the adjacent cell is higher than the auxiliary cell by an offset;

event B1: the neighbor cell is above an absolute threshold;

event B2: the primary cell is above one absolute threshold 1 and the neighbor cell is above another absolute threshold 2.

The independent measurement identifier associates the measurement object with the specific reporting configuration, and if the terminal equipment reaches the measurement starting threshold, the terminal equipment can judge whether to carry out the measurement according to the existence of the measurement identifier.

After the terminal equipment completes measurement, the terminal equipment evaluates the measurement report when certain trigger conditions are met, and if the report conditions are met, the terminal equipment fills the measurement report and sends the measurement report to the network equipment.

Measurement reporting is mainly divided into three categories:

1. event triggering

The terminal equipment triggers the sending of the measurement report only when the network configuration measurement event is satisfied and enters the threshold and lasts for a period of time, and the flow is finished after the measurement report is sent once. The reporting configuration corresponding to the criterion is as follows:

the trigger type is 'event' and comprises a measurement event and a threshold parameter thereof from A1-A6 and B1-B2;

reporting times is 1;

the reporting interval is ignored by the UE regardless of the value of the configuration.

2. Periodic reporting

After network configuration measurement, the terminal equipment measures corresponding frequency points according to configuration contents, and sends measurement reports according to a specified reporting period and interval:

the trigger period is "period" and includes "reportCGI" and "reportStrongstcell"

If the reporting time of the reporting purpose 'reportCGI' is equal to 1, and if the reporting purpose is 'reportStrongestCell', the reporting time can be more than 1;

the terminal device starts a timer T321 once it is configured with the report of the "reportCGI" purpose. In order that the network can obtain the information required for establishing the neighbor cell list as soon as possible, if the content required for reporting is obtained before the timer expires, the terminal device may stop T321 and initiate reporting in advance.

3. Event triggered periodic reporting

The terminal equipment triggers the sending of the measurement report only when the measurement event meeting the network configuration enters the threshold and lasts for a period of time, and after the report is triggered, a timer between multiple measurements and a counter of the measurement times are started until the report times meet the requirement and then the process is finished. The reporting configuration corresponding to the criterion is as follows:

the trigger type is 'event', and comprises a measurement event from A1 to A5 and a threshold parameter thereof;

the reporting times are more than 1;

the reporting interval is effective, and the network sets a reporting period timer according to the configured interval parameter.

In the conditional handover, the source network device sends a conditional handover command configured by the target network device to the terminal device through the RRC connection reconfiguration message in advance, and the terminal device needs to reply the RRC connection reconfiguration complete message to the source network device. The terminal device will continuously monitor the channel quality of the target network device configured in the conditional switch command, and if the switch condition is satisfied, the terminal device can immediately initiate the switch. However, when the terminal device receives the RRC connection reconfiguration message sent by the source network device, the handover condition is already satisfied, and if the terminal device continues to reply the RRC connection reconfiguration complete message to the source network device and then performs handover, the waste of signaling overhead may be caused.

Fig. 4 shows a schematic block diagram of a method 400 for switching network devices according to an embodiment of the present application. As shown in fig. 4, the method 400 includes some or all of the following:

s410, the terminal equipment receives a Radio Resource Control (RRC) connection reconfiguration message sent by source network equipment;

s420, when the channel quality of the target network device and/or the source network device meets the handover condition, the terminal device initiates handover to the target network device and does not send an RRC connection reconfiguration complete message for the RRC connection reconfiguration message to the source network device based on the conditional handover command.

Specifically, the RRC connection reconfiguration message may carry a conditional handover command configured by the target network device. It should be noted that the RRC connection reconfiguration message herein may also not carry the conditional handover command, i.e. is decoupled from the conditional handover command. The RRC connection reconfiguration message may carry any information as long as the terminal device is required to reply the corresponding RRC connection reconfiguration complete message. For example, the terminal device receives the conditional handover command and the handover condition before receiving the RRC connection reconfiguration message carrying other information, and the channel quality of the target network device and/or the source network device meets the handover condition after receiving the RRC connection reconfiguration message, so that the terminal device may initiate handover to the target network device and not send the RRC connection reconfiguration complete message for the RRC connection reconfiguration message to the source network device. In addition, the handover condition in the embodiment of the present application may be configured by the source network device or configured by the target network device. The conditional handover command carried in the RRC connection reconfiguration message may be sent to the terminal device, or may be carried in the RRC connection reconfiguration message and sent to the terminal device in addition to the conditional handover command. The terminal equipment obtains the switching condition and the condition switching command, and measures the channel quality of the target network equipment and/or the source network equipment in real time according to the requirement of the switching condition. For example, the handover condition requires that the measured value of the channel quality of the source network device is poor to less than an absolute threshold, and if so, the terminal device may initiate handover to the target network device. For another example, the handover condition requires that the measured value of the channel quality of the source network device is poor to be less than an absolute threshold and the measured value of the channel quality of the target network device is good to be greater than an absolute threshold, and if the measured value of the channel quality of the target network device is good to be greater than an absolute threshold, the terminal device may initiate handover to the target network device. As another example, the handover condition may require that the measured value of the channel quality of the target network device is better than the measured value of the channel quality of the source network device by a threshold, and if so, the terminal device may initiate handover to the network device.

In addition, the fact that the channel quality of the target network device and/or the source network device satisfies the handover condition may not only mean that the measured value of the channel quality of the target network device and/or the source network device satisfies a condition, such as the first condition, but also mean that the duration of time during which the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition reaches a trigger time. After the trigger time is reached, the terminal device may initiate handover to the target network device. That is, the handover condition includes not only the first condition but also a first time to trigger TTT1, and the channel quality of the target network device and/or the source network device satisfies the handover condition, including: the duration for which the measured value of channel quality of the target network device and/or the source network device satisfies the first condition reaches the TTT 1.

Optionally, the terminal device may also initiate handover to the target network device immediately when determining that the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition, that is, the handover condition does not include the first time to trigger TTT1, which may also mean that the TTT1 included in the handover condition is 0.

In addition, under the condition that the channel quality of the target network device and/or the source network device meets the handover condition, the terminal device does not send an RRC connection reconfiguration complete message for the received RRC connection reconfiguration message to the source network device, so as to avoid causing unnecessary signaling overhead.

In an implementation embodiment, the terminal device may immediately measure the channel quality of the target network device and/or the source network device when receiving the RRC connection reconfiguration message carrying the conditional handover command and the handover condition for the first time, and determine that the obtained measurement value satisfies the first condition, and further, if the obtained measurement value satisfies the first condition, continue to use the TTT1, then the terminal device may initiate handover to the target network device, and does not send the RRC connection reconfiguration complete message to the source network device. The implementation of this embodiment is shown in fig. 5, where the conditional handover command is carried in the RRC connection reconfiguration message.

In another implementation, the terminal device already receives the first condition of the handover conditions before receiving the RRC connection reconfiguration message carrying the conditional handover command and the handover conditions. For example, the terminal device receives in advance measurement configuration information sent by the source network device, and the measurement configuration information includes a measurement object and a reporting configuration corresponding to the first condition. Or it may be said that the first condition is included in the measurement configuration information. It should be noted that the first condition may include one of the various measurement events described above, for example, and the measurement configuration information may include other conditions besides the first condition. For example, the first condition may be measId as described above and correspond to a measObjectId and a reportConfigId. Wherein, the reportConfigId corresponds to a measurement report configuration item. The measurement report configuration item is configured with various measurement events including a threshold value and the like, and in addition, the measurement report configuration item can also be configured with a TTT.

Optionally, the terminal device receives the measurement configuration information sent by the source network device in advance, and the terminal device performs measurement according to the configuration in the measurement configuration information all the time, and the terminal device finds that the first condition in the measurement configuration information is satisfied when receiving the RRC connection reconfiguration message carrying the condition handover command and the handover condition, and the first condition in the measurement configuration information is exactly the same as the first condition in the handover condition. At this time, the terminal device may consider the measured value of the channel quality of the source network device and/or the target network device to satisfy the first condition among the handover conditions. For example, the first condition in the measurement configuration information is that the measured value of the channel quality of the neighboring cell is higher than a decision threshold, the terminal device measures the channel quality of the neighboring cell all the time after receiving the measurement configuration information, and when the terminal device receives the conditional handover command and the handover condition, it is determined that the measured value of the channel quality of the neighboring cell satisfies the first condition in the measurement configuration information, and the terminal device finds that this neighboring cell is exactly the cell (i.e., the target network device herein) where the network device sending the conditional handover command is located, and the first condition in the measurement configuration information is the same as the first condition in the handover command. The terminal device may determine that the measured value of the channel quality of the target network device satisfies the first condition of the handover conditions, and further, the measured value of the channel quality of the target network device can continue for a TTT1 if the first condition is satisfied, and then the terminal device may initiate handover to the target network device and does not send an RRC connection reconfiguration complete message to the source network device, which is implemented as shown in fig. 6.

Optionally, the terminal device may also perform measurement in advance based on a first condition in the received measurement configuration information, for example, the first condition is that a measurement value of channel quality of a neighboring cell is higher than an absolute threshold. Before the terminal device receives the conditional handover command and the handover condition, the measured value of the channel quality of the neighboring cell already satisfies the first condition in the measurement configuration information, and continues until the terminal device receives the conditional handover command and the handover condition, at which time the terminal device finds that this neighboring cell is exactly the cell (i.e. the target network device herein) where the network device sending the conditional handover command is located, and the first condition in the measurement configuration information is the same as the first condition in the handover command. The terminal device may consider that the measured value of the channel quality of the target network device satisfies the first condition of the handover conditions since it is determined that the channel quality of the neighbor cell satisfies the first condition of the measurement configuration information, and the terminal device may initiate handover to the target network device and not send an RRC connection reconfiguration complete message to the source network device as long as the TTT1 continues.

As described above, the terminal device performs measurement according to the measurement configuration information issued by the network side, and when a certain trigger condition (first condition) is satisfied, the terminal device also needs to perform evaluation of measurement reporting, and if the reporting condition is satisfied, the terminal device needs to report a measurement report to the network side. In the embodiment of the present application, the terminal device performs measurement based on the measurement configuration information and determines that the first condition is satisfied, but the purpose is to determine that the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition, and further initiate handover to the target network device according to the continuous TTT1, and therefore, reporting of the measurement report is unnecessary, that is, in a case that the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition in the measurement configuration information, the terminal device may not send the measurement report for the measurement configuration information to the source network device. Thereby further reducing signaling overhead.

Herein, there are two TTTs, wherein TTT1 is included in the handover condition for triggering the terminal device to initiate a handover to the target network device, in particular, when the duration of time for which the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition reaches TTT1, the terminal device is triggered to initiate a handover to the target network device. A second time to trigger, TTT2, is included in the measurement configuration information for triggering the reporting of the measurement report. Specifically, when the terminal device performs measurement based on the measurement configuration information and the duration of satisfying the first condition reaches TTT2, the terminal device is triggered to send a measurement report to the source network device.

Alternatively, in the embodiment of the present application, as shown in fig. 7, TTT2 may be greater than or equal to TTT 1. Specifically, when the terminal device determines that the first condition in the measurement configuration information is satisfied, the terminal device may start the TTT1 and the TTT2, and the first condition in the measurement configuration information is satisfied within the duration of the whole TTT1, and when the TTT1 is reached, that is, the terminal device may be triggered to initiate handover to the target network device, at this time, since the TTT2 is not reached yet, that is, reporting of the measurement report is not satisfied, the terminal device does not report the measurement report to the source network device. Optionally, the TTT1 in this embodiment of the application may start from the satisfaction of the first condition in the measurement configuration information, or may start from the reception of an RRC connection reconfiguration message carrying a conditional handover command and a handover condition, and the end of the TTT1 may be the same as the end of the TTT2, or the start and the end of the TTT1 may completely coincide with the start and the end of the TTT 2.

Alternatively, in the embodiment of the present application, as shown in fig. 8, the TTT2 may be smaller than the TTT 1. Specifically, when the terminal device determines that the first condition in the measurement configuration information is satisfied, the terminal device may start the TTT1 and the TTT2, and the first condition in the measurement configuration information is satisfied within the duration of the whole TTT1, and when the TTT1 is reached, that is, the terminal device may be triggered to initiate handover to the target network device, whereas before the TTT2 is reached, that is, reporting of the measurement report is satisfied, but the terminal device does not report the measurement report to the source network device as well. Further, upon reaching the TTT2, the terminal device needs to further determine that the measured value of the channel quality of the target network device and/or the source network device between meeting the TTT2 and not meeting the TTT1 (i.e., TTT1-TTT2) meets the first condition, so that the terminal device can be triggered to initiate a handover to the target network device upon reaching the TTT 1. Optionally, the start of the TTT1 may also be started from receiving an RRC connection reconfiguration message carrying a conditional handover command and a handover condition, and then triggering the terminal device to initiate handover to the target network device is independent of the TTT2, but only when the TTT2 is reached, the terminal device does not report a measurement report to the source network device.

Since the reporting of the measurement report may also be triggered periodically, that is, the terminal device may maintain a timer, and when the timer expires, the terminal device reports the measurement report to the network device. In this embodiment, if the terminal device determines that the channel quality of the target network device and/or the source network device meets the handover condition before the timer expires, the terminal device may initiate handover to the target network device and not send a measurement report to the source network device. Or the terminal device has determined that the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition before the timer expires and has not reached the TTT1, then likewise, the terminal device does not send a measurement report to the source network device when the timer for reporting a measurement report expires.

Optionally, the terminal device may further suspend (suspend) a signaling Radio bearer (signaling Radio bearer) and/or a Radio Link Control (RLC)/Packet Data Convergence Protocol (PDCP) entity related thereto, when the channel quality of the target network device and/or the source network device satisfies the handover condition.

Optionally, the terminal device may also reset (reset) the SRB, and/or its associated RLC/PDCP entity, in case the channel quality of the target network device and/or the source network device satisfies the handover condition.

It should be understood that, in the conditional handover, the conditional handover command may be configured to the terminal device by a plurality of target network devices, and the plurality of target network devices may share one handover condition or may respectively correspond to one handover condition. Moreover, the conditional handover commands and handover conditions of multiple target network devices may be carried in one RRC connection reconfiguration message, or may be sent in multiple pieces.

It should be understood that the interaction between the source network device and the target network device described at the network device side and the terminal device, and the related characteristics, functions, and the like correspond to the related characteristics and functions of the terminal device. And the related contents have been described in detail in the above method 400, and are not described herein again for brevity.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Having described the method for switching the network device according to the embodiment of the present application in detail, the apparatus for switching the network device according to the embodiment of the present application will be described below with reference to fig. 9 to 11, and the technical features described in the embodiment of the method are applicable to the following apparatus embodiments.

Fig. 9 shows a schematic block diagram of a terminal device 500 of an embodiment of the present application. As shown in fig. 9, the terminal device 500 includes:

a transceiver unit 510, configured to receive a radio resource control RRC connection reconfiguration message sent by a source network device;

a processing unit 520, configured to initiate handover to a target network device and not send an RRC connection reconfiguration complete message for the RRC connection reconfiguration message to the source network device based on a conditional handover command if channel quality of the target network device and/or the source network device satisfies a handover condition.

Optionally, in this embodiment of the present application, the RRC connection reconfiguration message includes the conditional handover command.

Optionally, in this embodiment of the present application, the RRC connection reconfiguration message includes the handover condition, the handover condition includes a first condition and a first trigger time, and the quality of the channel of the target network device and/or the source network device meets the handover condition, including: the duration for which the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition reaches the first trigger time.

Optionally, in an embodiment of the present application, the processing unit is further configured to: measuring channel quality of the target network device and/or the source network device on condition that the RRC connection reconfiguration message is received; determining that the measured value of channel quality of the target network device and/or the source network device satisfies the first condition.

Optionally, in an embodiment of the present application, the processing unit is further configured to: determining that the first condition is satisfied before the terminal device receives the RRC connection reconfiguration message.

Optionally, in this embodiment of the present application, the transceiver unit is further configured to: before the transceiver unit receives the RRC connection reconfiguration message, receive measurement configuration information sent by the source network device, where the measurement configuration information includes the first condition.

Optionally, in this embodiment of the present application, the measurement configuration information includes a second trigger time, where the first trigger time is used to trigger the terminal device to initiate handover to the target network device, and the second trigger time is used to trigger reporting of a measurement report, and the processing unit is further configured to: not sending a measurement report for the measurement configuration information to the source network device if the first trigger time is met and/or the second trigger time is met.

Optionally, in this embodiment of the present application, the second trigger time is greater than or equal to the first trigger time.

Optionally, in this embodiment of the present application, the second trigger time is less than the first trigger time.

Optionally, in an embodiment of the present application, the processing unit is further configured to: in an instance in which the second trigger time is satisfied, determining that a measurement of channel quality of the target network device and/or the source network device satisfies the first condition between the second trigger time being satisfied and the first trigger time not being satisfied.

Optionally, in an embodiment of the present application, the processing unit is further configured to: and when the channel quality of the target network equipment and/or the source network equipment meets the switching condition, suspending a Signaling Radio Bearer (SRB) and/or a Radio Link Control (RLC)/Packet Data Convergence Protocol (PDCP) entity corresponding to the SRB, or resetting the SRB and/or the RLC/PDCP entity corresponding to the SRB when the channel quality of the target network equipment and/or the source network equipment meets the switching condition.

Therefore, in the case of configuring the condition switching, the terminal device in the embodiment of the present application may determine whether the channel quality satisfies the switching condition after receiving the RRC connection reconfiguration message, and directly perform the switching in the case that the switching condition is satisfied, so that the terminal device may not send a corresponding RRC connection reconfiguration complete message to the network side any more, thereby reducing the signaling overhead.

Fig. 10 is a schematic structural diagram of a terminal device 600 according to an embodiment of the present application. The terminal device 600 shown in fig. 10 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 10, the terminal device 600 may further include a memory 620. From the memory 620, the processor 610 may call and run a computer program to implement the method in the embodiment of the present application.

The memory 620 may be a separate device from the processor 610, or may be integrated into the processor 610.

Optionally, as shown in fig. 10, the terminal device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 630 may include a transmitter and a receiver, among others. The transceiver 630 may further include one or more antennas.

Fig. 11 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 700 shown in fig. 11 includes a processor 710, and the processor 710 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 11, the chip 700 may further include a memory 720. From the memory 720, the processor 710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 720 may be a separate device from the processor 710, or may be integrated into the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to the terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

Fig. 12 is a schematic block diagram of a communication system 800 provided in an embodiment of the present application. As shown in fig. 12, the communication system 800 includes a terminal device 810 and a network device 820.

The terminal device 810 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the network device 820 may be configured to implement the corresponding function implemented by the network device in the foregoing method, which is not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (27)

1. A method for switching network devices, comprising:

   the method comprises the steps that terminal equipment receives a Radio Resource Control (RRC) connection reconfiguration message sent by source network equipment;

   and under the condition that the channel quality of the target network equipment and/or the source network equipment meets the switching condition, the terminal equipment initiates switching to the target network equipment and does not send an RRC connection reconfiguration completing message aiming at the RRC connection reconfiguration message to the source network equipment based on a condition switching command.
2. The method of claim 1, wherein the RRC connection reconfiguration message comprises the conditional handover command.
3. The method according to claim 1 or 2, wherein the RRC connection reconfiguration message includes the handover condition, the handover condition includes a first condition and a first trigger time, and the handover condition is satisfied by the channel quality of the target network device and/or the source network device, and includes: the duration for which the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition reaches the first trigger time.
4. The method of claim 3, further comprising:

   the terminal device measures the channel quality of the target network device and/or the source network device under the condition of receiving the RRC connection reconfiguration message;

   the terminal device determines that the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition.
5. The method of claim 3, further comprising:

   the terminal device determines that the first condition has been met before the terminal device receives the RRC connection reconfiguration message.
6. The method of claim 5, further comprising:

   before the terminal device receives the RRC connection reconfiguration message, the terminal device receives measurement configuration information sent by the source network device, where the measurement configuration information includes the first condition.
7. The method of claim 6, wherein the measurement configuration information includes a second trigger time, wherein the first trigger time is used for triggering the terminal device to initiate handover to the target network device, and wherein the second trigger time is used for triggering reporting of a measurement report, and wherein the method further comprises:

   and the terminal equipment does not send a measurement report aiming at the measurement configuration information to the source network equipment under the condition that the first trigger time is met and/or the second trigger time is met.
8. The method of claim 7, wherein the second trigger time is greater than or equal to the first trigger time.
9. The method of claim 7, wherein the second trigger time is less than the first trigger time.
10. The method of claim 9, further comprising:

    in the event that the second trigger time is met, the terminal device determines that the measured value of the channel quality of the target network device and/or the source network device meets the first condition between the second trigger time being met and the first trigger time not being met.
11. The method according to any one of claims 1 to 10, further comprising:

    when the channel quality of the target network equipment and/or the source network equipment meets the switching condition, the terminal equipment suspends the Signaling Radio Bearer (SRB) and/or a Radio Link Control (RLC)/Packet Data Convergence Protocol (PDCP) entity corresponding to the SRB, or

    And under the condition that the channel quality of the target network equipment and/or the source network equipment meets the switching condition, the terminal equipment resets the SRB and/or the RLC/PDCP entity corresponding to the SRB.
12. A terminal device, characterized in that the terminal device comprises:

    a receiving and sending unit, configured to receive a radio resource control RRC connection reconfiguration message sent by a source network device;

    a processing unit, configured to initiate handover to a target network device and not send an RRC connection reconfiguration complete message for the RRC connection reconfiguration message to the source network device based on a conditional handover command when channel quality of the target network device and/or the source network device satisfies a handover condition.
13. The terminal device of claim 12, wherein the RRC connection reconfiguration message comprises the conditional handover command.
14. The terminal device according to claim 12 or 13, wherein the RRC connection reconfiguration message includes the handover condition, the handover condition includes a first condition and a first trigger time, and the first trigger time is a first trigger time, and the channel quality of the target network device and/or the source network device satisfies the handover condition, including: the duration for which the measured value of the channel quality of the target network device and/or the source network device satisfies the first condition reaches the first trigger time.
15. The terminal device of claim 14, wherein the processing unit is further configured to:

    measuring channel quality of the target network device and/or the source network device on condition that the RRC connection reconfiguration message is received;

    determining that the measured value of channel quality of the target network device and/or the source network device satisfies the first condition.
16. The terminal device of claim 14, wherein the processing unit is further configured to:

    determining that the first condition is satisfied before the terminal device receives the RRC connection reconfiguration message.
17. The terminal device according to claim 16, wherein the transceiver unit is further configured to:

    before the transceiver unit receives the RRC connection reconfiguration message, receive measurement configuration information sent by the source network device, where the measurement configuration information includes the first condition.
18. The terminal device of claim 17, wherein the measurement configuration information includes a second trigger time, and wherein the first trigger time is used to trigger the terminal device to initiate handover to the target network device, and the second trigger time is used to trigger reporting of a measurement report, and wherein the processing unit is further configured to:

    not sending a measurement report for the measurement configuration information to the source network device if the first trigger time is met and/or the second trigger time is met.
19. The terminal device of claim 18, wherein the second trigger time is greater than or equal to the first trigger time.
20. The terminal device of claim 18, wherein the second trigger time is less than the first trigger time.
21. The terminal device of claim 20, wherein the processing unit is further configured to:

    in an instance in which the second trigger time is satisfied, determining that a measurement of channel quality of the target network device and/or the source network device satisfies the first condition between the second trigger time being satisfied and the first trigger time not being satisfied.
22. The terminal device of any of claims 12 to 21, wherein the processing unit is further configured to:

    suspending a Signaling Radio Bearer (SRB) and/or a Radio Link Control (RLC)/Packet Data Convergence Protocol (PDCP) entity corresponding to the SRB, or

    Resetting the SRB and/or the RLC/PDCP entity corresponding to the SRB when the channel quality of the target network device and/or the source network device satisfies the handover condition.
23. A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 11.
24. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 1 to 11.
25. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 11.
26. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 11.
27. A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 1 to 11.

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