CN107889174B

CN107889174B - Switching method, terminal equipment, base station and system

Info

Publication number: CN107889174B
Application number: CN201610877651.8A
Authority: CN
Inventors: 徐晓东
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2021-01-12
Anticipated expiration: 2036-09-30
Also published as: CN107889174A

Abstract

The invention discloses a switching method, terminal equipment, a base station and a system, wherein the method comprises the following steps: receiving a switching instruction sent by a source base station, wherein the switching instruction at least carries configuration information of a Sounding Reference Signal (SRS) configured by a target base station of the terminal equipment; transmitting an SRS (sounding reference signal) based on SRS configuration information in the switching instruction, wherein the SRS is used for enabling the target base station to detect a Timing Advance (TA); receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, determining to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switching to the target base station.

Description

Switching method, terminal equipment, base station and system

Technical Field

The present invention relates to handover management in the field of communications, and in particular, to a handover method, a terminal device, a base station, and a system.

Background

In the existing system, the switching between cells can include several steps such as switching measurement, switching decision and switching execution; particularly when performing handover between cells, there may be a need to first release the connection with the source cell and then establish the connection with the target cell. In this period of process, the terminal device cannot perform data interaction with the target cell at once, and particularly when the target cell and the source cell are pilot frequency cells, there may be a problem that the delay of data interaction between the terminal device and the target cell is longer.

Disclosure of Invention

In view of the above, the present invention provides a handover method, a terminal device, a base station and a system, which can at least solve the above problems in the prior art.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the embodiment of the invention provides a switching method, which comprises the following steps:

receiving a switching instruction sent by a source base station, wherein the switching instruction at least carries configuration information of a Sounding Reference Signal (SRS) configured by a target base station of the terminal equipment;

sending an SRS (sounding reference signal) based on SRS configuration information in the switching instruction, wherein the SRS is used for enabling the target base station to detect a Timing Advance (TA);

receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, determining to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switching to the target base station.

The embodiment of the invention provides a switching method, which is applied to a source base station and comprises the following steps:

selecting a target base station for terminal equipment, and receiving configuration information of a Sounding Reference Signal (SRS) sent by the target base station;

and at least adding the configuration information of the SRS to a switching instruction, and sending the switching instruction to the terminal equipment.

The embodiment of the invention provides a switching method, which is applied to a target base station and comprises the following steps:

configuring configuration information of a Sounding Reference Signal (SRS) for timing advance detection for terminal equipment;

sending the configuration information of the SRS to a source base station of the terminal equipment;

and detecting an SRS sent by the terminal equipment, determining a TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment.

An embodiment of the present invention provides a terminal device, where the terminal device includes:

a receiving unit, configured to receive a handover instruction sent by a source base station, where the handover instruction at least carries configuration information of an SRS configured by a target base station of the terminal device; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station;

the processing unit is used for determining to complete uplink synchronization with the target base station and switching to the target base station based on TA in the target base station indication signaling;

and an information transmitting unit, configured to transmit an SRS based on SRS configuration information in the handover command, where the SRS is used for enabling the target base station to detect the TA.

The embodiment of the invention provides a source base station, which comprises:

a base station selection unit, configured to select a target base station for the terminal device;

a receiving unit, configured to receive configuration information of a sounding reference signal SRS sent by the target base station;

a sending unit, configured to add at least the configuration information of the SRS to a handover instruction, and send the handover instruction to the terminal device.

An embodiment of the present invention provides a target base station, including:

a configuration unit, configured to configure configuration information of a Sounding Reference Signal (SRS) for timing advance detection for a terminal device; sending the TA to a source base station of the terminal equipment;

a sending unit, configured to send the configuration information of the SRS to a source base station of the terminal device;

and the signal detection unit is used for detecting the SRS sent by the terminal equipment and determining the TA corresponding to the terminal equipment based on the detected SRS.

the source base station selects a target base station for the terminal equipment;

the target base station of the terminal equipment configures configuration information of an SRS for timing advance detection for the terminal equipment; sending the configuration information of the SRS to a source base station of the terminal equipment;

the source base station receives the SRS configuration information sent by the target base station, at least adds the SRS configuration information to a switching instruction, and sends the switching instruction to the terminal equipment;

the terminal equipment receives a switching instruction sent by the source base station, wherein the switching instruction at least carries SRS configuration information configured by a target base station of the terminal equipment; sending an SRS based on the SRS configuration information in the switching instruction;

the target base station detects an SRS sent by the terminal equipment, determines a TA corresponding to the terminal equipment based on the detected SRS, and sends the TA to a source base station of the terminal equipment, wherein the source base station sends a target base station indication signaling at least containing the TA to the terminal equipment;

and the terminal equipment receives a target base station indication signaling which at least comprises TA and is sent by the source base station, synchronizes with the target base station based on the TA in the target base station indication signaling and switches to the target base station.

An embodiment of the present invention provides a switching system, where the system includes:

the source base station is used for selecting a target base station for the terminal equipment; receiving SRS configuration information sent by the target base station, at least adding the SRS configuration information to a switching instruction, and sending the switching instruction to the terminal equipment; sending a target base station indication signaling at least containing TA to the terminal equipment;

the target base station is used for configuring the configuration information of the SRS used for timing advance detection for the terminal equipment; sending the configuration information of the SRS to a source base station of the terminal equipment; detecting an SRS sent by the terminal equipment, determining a TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment;

the terminal device is configured to receive a handover instruction sent by the source base station, where the handover instruction at least carries SRS configuration information configured by a target base station of the terminal device; sending an SRS based on the SRS configuration information in the switching instruction; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, synchronizing the TA in the target base station indication signaling with the target base station and switching to the target base station.

The embodiment of the invention provides a switching method, terminal equipment, a base station and a system, wherein the terminal equipment can acquire the configuration information of a target base station for an SRS (sounding reference signal), and then sends the SRS based on the configuration information of the SRS, so that the target base station sends a TA (timing advance) to the terminal equipment based on the measurement of the SRS, and then the terminal equipment is finally accessed to the target base station based on the TA. Therefore, the terminal equipment can configure the SRS based on the SRS configuration information sent by the target base station, the problem of service data transmission delay caused by incapability of knowing the corresponding configuration of the target base station when the terminal equipment is switched between the source base station and the target base station is solved, and particularly the problem of service data delay in the switching process of the terminal equipment under the scene that the target base station and the source base station work in different frequencies can be solved.

In addition, in the switching process, the communication of the processing link aiming at the source base station is maintained while the processing link aiming at the target base station is established, so that the delay of service data caused by resetting the processing link is avoided, and the processing efficiency of the terminal equipment for receiving the service data in the switching process is further improved.

Drawings

FIG. 1 is a first flowchart illustrating a handover method according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a second method of handover according to an embodiment of the present invention;

FIG. 3 is a third schematic flow chart illustrating a handover method according to an embodiment of the present invention;

FIG. 4 is a fourth flowchart illustrating a handover method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a structure of a terminal device according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a source base station according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a target base station in accordance with an embodiment of the present invention;

fig. 8 is a fifth flowchart illustrating a handover method according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a system configuration according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The first embodiment,

An embodiment of the present invention provides a handover method, which is applied to a terminal device, and as shown in fig. 1, the handover method includes:

step 11: receiving a switching instruction sent by a source base station, wherein the switching instruction at least carries configuration information of a Sounding Reference Signal (SRS) configured by a target base station of the terminal device;

step 12: transmitting an SRS (sounding reference signal) based on SRS configuration information in the switching instruction, wherein the SRS is used for enabling the target base station to detect a Timing Advance (TA);

step 13: receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, determining to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switching to the target base station.

Here, the terminal device may be a mobile terminal, and specifically, may be a mobile phone.

It should be noted that, before performing step 11, the terminal device further needs to perform operations such as handover measurement, for example, the operations may include: the terminal device may measure a reference signal sent by at least one candidate base station according to measurement configuration of a source base station, obtain a signal measurement result for the at least one candidate base station, and send the signal measurement result to the source base station, so that the source base station may select a target base station for the terminal device based on the signal measurement result of the at least one candidate base station. Of course, it should be understood that the above is only one implementation of performing handover measurement on the terminal device, and other handover measurements may also be included in the actual processing, which is not exhaustive in this embodiment.

Further, after the source base station selects the target base station of the target cell for the terminal device, the source base station may further perform handover preparation, for example, the handover preparation may include: and the source base station sends a switching request to the selected target base station, and performs downlink resource allocation for the terminal equipment after receiving the confirmation of the switching request fed back by the target base station.

In step 11, the handover command sent by the source base station includes configuration information of the SRS configured by the target base station; the switching instruction is carried by Radio Resource Control (RRC) connection reconfiguration information; the RRC connection reconfiguration information is sent from the target base station to the source base station, and a specific generation manner is not limited in this embodiment.

The SRS configuration information configured by the target base station at least includes frequency point information of the target base station, or at least includes time-frequency resource information of the target base station;

specifically, the frequency point information of the target base station at least includes a frequency point, for example, frequency point information for performing SRS detection;

the time-frequency resource information of the target base station may specifically include time-domain resources, such as subframe configuration for SRS, and frequency-domain resources, such as frequency points; alternatively, the time-frequency resource information of the target base station includes information of Resource Blocks (RBs), for example, the position of the resource block for performing SRS transmission.

On the basis of the SRS configuration information, the SRS configuration information may further include at least one of: SRS bandwidth Configuration (CSRS) parameters, SRS subframe configuration parameters, an indication of whether SRS and NAK/ACK are transmitted simultaneously, and TDD parameters. Of course, the configuration information of the SRS is only an example, and is not used to limit the specific configuration information of the embodiment, that is, the SRS configuration information provided in the embodiment may further include other parameters besides the parameters.

Correspondingly, the terminal device can determine whether the source base station and the target base station have the same frequency based on the frequency point information of the target base station or the time-frequency resource information of the target base station, for example, whether the source base station and the target base station have the same frequency can be determined by using the frequency point of the target base station and the frequency point of the source base station.

In addition, frequency point information of the target base station is acquired, or one scene of the time-frequency resource information of the target base station is as follows:

when the configuration information of the SRS sent by the target base station does not include the frequency point information of the target base station, or the time-frequency resource information of the target base station, the source base station may further obtain the frequency point information of the target base station from the target base station, or the time-frequency resource information of the target base station; the implementation mode can be as follows:

detecting the SRS configuration information sent by a target base station, and judging whether the SRS configuration information contains frequency point information of the target base station or at least comprises time-frequency resource information of the target base station; if not, sending instruction information for acquiring frequency point information of the target base station or time-frequency resource information of the target base station to the target base station, and receiving the frequency point information of the target base station or the time-frequency resource information of the target base station.

On the basis of the above processing, the source base station may send the frequency point information of the target base station, or the time-frequency resource information of the target base station, to the terminal device together with the SRS configuration information;

in addition, the source base station may further add the frequency point information of the target base station, or add the time-frequency resource information of the target base station to the SRS configuration information, and send the SRS configuration information to the terminal device.

Under this scenario, the subsequent processing flow of the terminal device is the same as that described above, and is not described herein again.

The terminal equipment can determine the uplink working frequency corresponding to the target base station by receiving the SRS configuration information and determine the frequency for sending the SRS, so that the target base station can receive the SRS sent by the terminal equipment when the target base station and the source base station work in different frequencies, and the condition of partial service delay caused by the fact that the target base station cannot receive the SRS is avoided.

The sending of the SRS based on the SRS configuration information in the handover command may be used to enable the target base station to estimate the quality of uplink channels of the terminal device in different frequency bands by receiving the SRS; and the SRS may enable the target base station to estimate uplink timing, in particular uplink Timing Advance (TA).

Specifically, the SRS may be periodically transmitted or aperiodically transmitted by the terminal device. For example, when the SRS is transmitted, the SRS may be transmitted to different candidate base stations and/or source base stations; one terminal device may configure periodic SRS transmission at each candidate base station, and the SRS transmitted for each candidate base station may adopt different configurations, but one of the configurations is necessarily the SRS generated based on the SRS configuration information transmitted from the target base station.

In addition, with respect to the subframe configuration of the SRS, the terminal device may set the SRS in the last symbol in the uplink subframe.

It should be noted that, before performing step 11 and before receiving the handover command sent by the source base station, the method further includes: performing data interaction with the source base station based on a first processing link; accordingly, after performing step 11, the method further includes: and performing data interaction with the target base station based on a second processing link, and reserving the first processing link to perform data interaction with the source base station.

Specifically, the data interaction with the source base station based on the first processing link may include: and receiving a switching instruction sent by the source base station based on the first processing link, and performing data interaction with the source base station.

And sending the SRS to the target base station based on the second processing link, and performing data interaction with the target.

The processing link may specifically be processing logic arranged in the processing unit of the terminal device, and the establishment of the two processing links is that one of the processing links processes and feeds back information sent by the source base station; and the other processing link processes and feeds back the information sent by the target base station. The establishment method of the processing link can allocate processing resources for the processing unit to specially perform information of the source base station or the target base station. The specific allocated resources are not limited to the information of which base station to process.

Therefore, the situation that the terminal equipment cannot receive the service data for a period of time due to the switching operation can be avoided, and the terminal equipment can keep acquiring the service data by keeping connection with the source base station when the switching is executed.

In the foregoing solution, the processing manner for the target base station to determine the TA based on the SRS may include: the target base station obtains the SRS receiving timing deviation, namely the uplink timing advance TA of the terminal, based on the characteristic that the SRS is sent in the fixed time domain position period and by combining a signal detection algorithm.

It should be noted that, after receiving the target bs indication signaling sent by the source bs and containing at least TA, the method further includes:

determining a target base station based on the target base station indication signaling;

switching to the target base station based on a configured second processing link, and monitoring a control signaling issued by the target base station based on the second processing link;

and sending switching completion information to the source base station.

It should be noted that, here, the performing of the handover and the monitoring is performed based on the second processing link, specifically, the radio resource is controlled to be handed over to the target base station based on the second processing link, and the control signaling sent by the target base station is received through the radio resource (e.g., a physical channel) and is processed by the underlying processing resource through the second processing link.

Correspondingly, after the source base station receives the switching completion information, the source base station also sends the switching completion information to the target base station, so that the target base station knows the switching state of the terminal equipment and interacts with the terminal equipment to complete the switching, and the terminal equipment is accessed to the target equipment to perform a normal communication process. The detailed communication flow is not described herein.

It can be seen from this scheme that, under the same frequency condition between the source cell (specifically, the source base station) and the target cell (specifically, the target base station), the SRS transmitted by the UE in the source cell and the target cell (specifically, the target cell) may also be detected, but if the SRS transmitted by the source cell is in an inter-frequency condition, the SRS transmitted by the source cell may be invalid for the target cell (the target cell does not necessarily support the frequency of the source cell).

An example of a process is provided below, see fig. 2, including:

step 21: the target cell is responsible for configuring the SRS, and then transmits the SRS configuration information to the source cell (for example, after the source cell receives the handover request, the SRS configuration information is transmitted to the source cell in the handover request acknowledgement after the source cell receives the handover request);

step 22: the source cell notifies the UE of the SRS configuration information of the target cell (for example, carried by a handover command), and after receiving the handover command, the UE may switch the RF to the target cell and configure and transmit the SRS based on the received SRS (according to the existing flow, the network side will initiate a data forwarding flow, and at the same time, the UE will execute a link reset processing flow after receiving the rrcconnectionconfiguration in the handover command);

in order to reduce the interruption delay, link reset should not be executed at this time, but a dual-processing link configuration is adopted;

step 23: after determining TA based on the SRS detection, the target cell informs the source cell of the TA;

step 24: after receiving the TA, the source cell informs the UE of really switching to the target cell through an extra signaling (after receiving the signaling, the UE sends RRCconnectionconfiguration entity to the source cell and then completely switches to the target cell to monitor and control signaling);

step 25: the source cell sends the rrcconnectionconfigurationoilomplete to the target cell.

Therefore, by adopting the above scheme, the terminal device can acquire the configuration information of the target base station for the SRS, and further send the SRS based on the configuration information of the SRS, so that the terminal device can configure the SRS based on the configuration information of the SRS sent by the target base station, thereby reducing the problem of transmission delay of service data caused by incapability of knowing the corresponding configuration of the target base station when the terminal device switches between the source base station and the target base station, and particularly reducing the problem of delay of the service data in the switching process of the terminal device in a scenario where the target base station and the source base station operate at different frequencies.

In addition, in the switching process, the communication of the processing link aiming at the source base station is maintained while the processing link aiming at the target base station is established, so that the delay of service data caused by resetting of a layer two protocol stack is avoided, and the processing efficiency of the terminal equipment for receiving the service data in the switching process is further improved.

Example II,

An embodiment of the present invention provides a handover method, which is applied to a source base station, and as shown in fig. 3, the method includes:

step 31: selecting a target base station for terminal equipment, and receiving configuration information of a Sounding Reference Signal (SRS) sent by the target base station;

step 32: and at least adding the configuration information of the SRS to a switching instruction, and sending the switching instruction to the terminal equipment.

It should be noted that, before performing step 31, after the source base station selects a target base station of a target cell for the terminal device, the source base station may further perform handover preparation, for example, the handover preparation may include: and the source base station sends a switching request to the selected target base station, and performs downlink resource allocation for the terminal equipment after receiving the confirmation of the switching request fed back by the target base station.

The handover command includes configuration information of the SRS configured by the target base station; in addition, in the handover command, the handover command is carried by Radio Resource Control (RRC) connection reconfiguration information; the RRC connection reconfiguration information is sent from the target base station to the source base station, and a specific generation manner is not limited in this embodiment.

It can be understood that the frequency point information of the target base station, or at least the time-frequency resource information of the target base station, may further include a downlink operating frequency of the target base station or a difference between the downlink operating frequency of the target base station and the downlink operating frequency of the source base station, but all information included in the frequency-related parameter is not performed here.

Correspondingly, the terminal device can determine whether the source base station and the target base station have the same frequency based on the frequency point information of the target base station or the time-frequency resource information of the target base station, for example, whether the same frequency is determined by using the uplink working frequency of the target base station and the uplink frequency point of the source base station; or, the difference of the uplink operating frequencies of the target base station can be used to determine whether the same frequency exists, where the difference of the uplink operating frequencies can be a positive number or a negative number, and when the difference is zero, the difference of the uplink operating frequencies and the negative number have the same frequency.

Correspondingly, the terminal device can determine whether the source base station and the target base station have the same frequency based on the frequency-related parameter of the target base station, for example, whether the source base station and the target base station have the same frequency can be determined by using the uplink operating frequency of the target base station and the uplink operating frequency of the source base station; or, the difference of the uplink operating frequencies of the target base station can be used to determine whether the same frequency exists, where the difference of the uplink operating frequencies can be a positive number or a negative number, and when the difference is zero, the difference of the uplink operating frequencies and the negative number have the same frequency.

The method further comprises the following steps: receiving a timing advance sent by the target base station of the terminal equipment; and at least adding the timing advance to a target base station indication signaling, and sending the target base station indication signaling to the terminal equipment.

The method further comprises the following steps: and receiving switching completion information sent by the terminal equipment, and sending the switching completion information to the target base station.

It can be seen from this scheme that, under the same frequency condition between the source cell and the target cell, the SRS transmitted by the UE in the source cell and the target cell may also be detected by the target cell, but if the SRS is in an inter-frequency condition, the SRS transmitted by the source cell may be invalid for the target cell (the target cell does not necessarily support the frequency of the source cell).

Example III,

An embodiment of the present invention provides a handover method, applied to a target base station, as shown in fig. 4, including:

step 41: configuring configuration information of a Sounding Reference Signal (SRS) for terminal equipment;

step 42: sending the configuration information of the SRS to a source base station of the terminal equipment;

step 43: and detecting an SRS sent by the terminal equipment, determining a TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment.

It should be noted that the terminal device further needs to perform operations such as handover measurement, for example, the operations may include: the terminal device may measure a reference signal sent by at least one candidate base station according to measurement configuration of a source base station, obtain a signal measurement result for the at least one candidate base station, and send the signal measurement result to the source base station, so that the source base station may select a target base station for the terminal device based on the signal measurement result of the at least one candidate base station. Of course, it should be understood that the above is only one implementation of performing handover measurement on the terminal device, and other handover measurements may also be included in the actual processing, which is not exhaustive in this embodiment.

The switching instruction sent by the source base station includes the configuration information of the SRS configured by the target base station; in addition, in the handover command, the handover command is carried by Radio Resource Control (RRC) connection reconfiguration information; the RRC connection reconfiguration information is sent from the target base station to the source base station, and a specific generation manner is not limited in this embodiment.

specifically, the frequency point information of the target base station at least includes an uplink frequency point, for example, frequency point information for performing SRS detection;

the time-frequency resources of the target base station may specifically include time-domain resources, such as subframe configuration for SRS, and frequency-domain resources, such as uplink frequency points.

Example four,

An embodiment of the present invention provides a terminal device, as shown in fig. 5, including:

a receiving unit 51, configured to receive a handover instruction sent by a source base station, where the handover instruction at least carries configuration information of a sounding reference signal SRS configured by a target base station of the terminal device; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station;

a processing unit 54, configured to determine, based on a TA in the target base station indication signaling, to complete uplink synchronization with the target base station and switch to the target base station;

an information transmitting unit 52, configured to transmit an SRS based on configuration information of the SRS in the handover instruction, where the SRS is used for enabling the target base station to detect a timing advance TA; and synchronizing with the target base station based on the TA in the indication signaling of the target base station and switching to the target base station.

Further, after the source base station selects the target base station of the target cell for the terminal device, the source base station may also perform handover preparation, for example, the source base station sends a handover request to the selected target base station, and after receiving a confirmation of the handover request fed back by the target base station, performs downlink resource allocation for the terminal device.

It should be noted that the terminal device further includes: a processing link management unit 53, configured to perform data interaction with the source base station based on a first processing link;

and performing data interaction with the target base station based on the second processing link and keeping performing data interaction with the source base station through the first processing link.

Therefore, the situation that the terminal equipment cannot receive the service data for a period of time due to the switching operation can be avoided, and the terminal equipment can keep acquiring the service data by keeping the processing link connection with the source base station when the switching is executed.

The processing unit 54 is configured to determine a target base station based on the target base station indication signaling; and switching to the target base station based on a configured second processing link, monitoring a control signaling issued by the target base station based on the second processing link, and sending switching completion information to the source base station.

Example V,

An embodiment of the present invention provides a source base station, as shown in fig. 6, including:

a base station selecting unit 61, configured to select a target base station for the terminal device;

a receiving unit 62, configured to receive configuration information of a sounding reference signal SRS sent by the target base station;

a sending unit 63, configured to add at least the configuration information of the SRS to a handover instruction, and send the handover instruction to the terminal device.

It should be noted that, the base station selecting unit 61 of the source base station is configured to, after selecting the target base station of the target cell for the terminal device, perform handover preparation by the source base station, for example, the source base station sends a handover request to the selected target base station, and after receiving an acknowledgement of the handover request fed back by the target base station, performs downlink resource allocation for the terminal device.

It should be specified that the frequency-related parameter of the target base station may be at least an uplink operating frequency of the target base station, or may be a difference between the uplink operating frequency and the downlink operating frequency of the target base station and the uplink operating frequency of the source base station; it is understood that the frequency-related parameter of the target base station may also include a downlink operating frequency of the target base station or a difference value between the downlink operating frequency of the target base station and the downlink operating frequency of the source base station, but all information included in the frequency-related parameter is not performed here.

A receiving unit, configured to receive a timing advance sent by the target base station of the terminal device;

a sending unit, configured to add at least the timing advance to a target base station indication signaling, and send the target base station indication signaling to the terminal device.

A receiving unit, configured to receive handover completion information sent by the terminal device;

and the sending unit is used for sending the switching completion information to the target base station.

Example six,

An embodiment of the present invention provides a target base station, as shown in fig. 7, including:

a configuration unit 71, configured to configure configuration information of a sounding reference signal SRS for timing advance detection for a terminal device; sending the TA to a source base station of the terminal equipment;

a sending unit 72, configured to send the configuration information of the SRS to a source base station of the terminal device;

and a signal detection unit 73, configured to detect an SRS sent by the terminal device, and determine a TA corresponding to the terminal device based on the detected SRS.

It should be noted that, the receiving unit is configured to receive handover completion information of the terminal device sent by the source cell, complete synchronization with the terminal device, and perform data interaction.

Example seven,

The present embodiment provides a switching system, as shown in fig. 8, a switching method of the system includes:

step 81: the source base station selects a target base station for the terminal equipment;

step 82: the target base station of the terminal equipment configures configuration information of an SRS for timing advance detection for the terminal equipment; sending the configuration information of the SRS to a source base station of the terminal equipment;

step 83: the source base station receives the SRS configuration information sent by the target base station, at least adds the SRS configuration information to a switching instruction, and sends the switching instruction to the terminal equipment;

step 84: the terminal equipment receives a switching instruction sent by the source base station, wherein the switching instruction at least carries SRS configuration information configured by a target base station of the terminal equipment; sending an SRS based on the SRS configuration information in the switching instruction;

step 85: the target base station detects an SRS sent by the terminal equipment, determines a TA corresponding to the terminal equipment based on the detected SRS, and sends the TA to a source base station of the terminal equipment, wherein the source base station sends a target base station indication signaling at least containing the TA to the terminal equipment;

step 86: and the terminal equipment receives a target base station indication signaling which at least comprises TA and is sent by the source base station, determines to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switches to the target base station.

Further, the above system can be seen in fig. 9, comprising:

a source base station 91, configured to select a target base station for the terminal device; receiving SRS configuration information sent by the target base station, at least adding the SRS configuration information to a switching instruction, and sending the switching instruction to the terminal equipment; sending a target base station indication signaling at least containing TA to the terminal equipment;

a target base station 92, configured to configure, for a terminal device, configuration information of an SRS for timing advance detection; sending the configuration information of the SRS to a source base station of the terminal equipment; detecting an SRS sent by the terminal equipment, determining a TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment;

a terminal device 93, configured to receive a handover instruction sent by the source base station, where the handover instruction at least carries configuration information of an SRS configured by a target base station of the terminal device; sending an SRS based on the SRS configuration information in the switching instruction; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, determining to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switching to the target base station.

The integrated module according to the embodiment of the present invention may also be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as an independent product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including several instructions for enabling a computer device (which may be a personal computer, a network device, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A switching method is applied to terminal equipment, and is characterized in that the method comprises the following steps:

receiving a switching instruction sent by a source base station, wherein the switching instruction at least carries configuration information of a Sounding Reference Signal (SRS) configured by a target base station of the terminal equipment; the switching instruction also comprises frequency point information of a target base station or time-frequency resource information of the target base station;

2. The method of claim 1, wherein before receiving the handover command from the source base station, the method further comprises:

performing data interaction with the source base station based on a first processing link;

correspondingly, after receiving the handover command from the source base station, the method further includes:

and performing data interaction with the target base station based on a second processing link and keeping performing data interaction with the source base station through the first processing link.

3. The method of claim 1, wherein after receiving target bs indication signaling sent by the source bs and including at least TA, the method further comprises:

and sending switching completion information to the source base station.

4. A handover method applied to a source base station is characterized in that the method comprises the following steps:

at least adding the SRS configuration information to a switching instruction, wherein the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or at least adding the configuration information of the SRS and the frequency point information of the target base station into a switching instruction; or the SRS configuration information and the time-frequency resource information of the target base station are added into a switching instruction;

and sending the switching instruction to the terminal equipment.

5. The method of claim 4, further comprising:

receiving a TA sent by the target base station of the terminal equipment;

adding at least the TA to a target base station indication signaling, and sending the target base station indication signaling to the terminal equipment;

and receiving switching completion information sent by the terminal equipment, and sending the switching completion information to the target base station.

6. A handover method applied to a target base station is characterized in that the method comprises the following steps:

configuring configuration information of a Sounding Reference Signal (SRS) for terminal equipment;

detecting an SRS sent by the terminal equipment, determining a TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment;

the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or responding to the received instruction information of the source base station, and sending the frequency point information of the target base station or the time-frequency resource information of the target base station to the source base station.

7. The method of claim 6, further comprising:

and receiving switching completion information of the terminal equipment sent by the source cell, and completing switching and performing data interaction with the terminal equipment.

8. A terminal device, characterized in that the terminal device comprises:

a receiving unit, configured to receive a handover instruction sent by a source base station, where the handover instruction at least carries configuration information of an SRS configured by a target base station of the terminal device; the switching instruction also comprises frequency point information of a target base station or time-frequency resource information of the target base station; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station;

9. The terminal device according to claim 8, wherein the terminal device further comprises:

a processing link management unit, configured to perform data interaction with the source base station based on a first processing link;

10. The terminal device of claim 8,

the processing unit is used for determining a target base station based on the target base station indication signaling; and switching to the target base station based on a configured second processing link, monitoring a control signaling issued by the target base station based on the second processing link, and sending switching completion information to the source base station.

11. A source base station, comprising:

a sending unit, configured to add at least the SRS configuration information to a handover instruction, where the SRS configuration information includes frequency point information of a target base station or time-frequency resource information of the target base station; or at least adding the configuration information of the SRS and the frequency point information of the target base station into a switching instruction; or the SRS configuration information and the time-frequency resource information of the target base station are added into a switching instruction;

the sending unit is further configured to send the switching instruction to the terminal device.

12. The source base station of claim 11,

a receiving unit, configured to receive a timing advance sent by the target base station of the terminal device; receiving switching completion information sent by the terminal equipment;

a sending unit, configured to add at least the timing advance to a target base station indication signaling, and send the target base station indication signaling to the terminal device; and sending the switching completion information to the target base station.

13. A target base station, comprising:

a configuration unit, configured to configure configuration information of an SRS for timing advance detection for a terminal device; sending the TA to a source base station of the terminal equipment;

the signal detection unit is used for detecting an SRS sent by the terminal equipment and determining a TA corresponding to the terminal equipment based on the detected SRS;

the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or, the sending unit is further configured to send, in response to receiving the instruction information of the source base station, the frequency point information of the target base station or the time-frequency resource information of the target base station to the source base station.

14. The target base station of claim 13,

and the receiving unit is used for receiving the switching completion information of the terminal equipment sent by the source cell, completing synchronization with the terminal equipment and performing data interaction.

15. A method of handover, the method comprising:

the target base station of the terminal equipment configures configuration information of an SRS for timing advance detection for the terminal equipment; sending the configuration information of the SRS to a source base station of the terminal equipment; the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or, in response to receiving the instruction information of the source base station, sending the frequency point information of the target base station or the time-frequency resource information of the target base station to the source base station;

the source base station receives the SRS configuration information sent by the target base station, and at least adds the SRS configuration information to a switching instruction; the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or at least adding the configuration information of the SRS and the frequency point information of the target base station into a switching instruction; or the SRS configuration information and the time-frequency resource information of the target base station are added into a switching instruction;

the source base station sends the switching instruction to the terminal equipment;

the terminal equipment receives a switching instruction sent by the source base station, wherein the switching instruction at least carries SRS configuration information configured by a target base station of the terminal equipment; the switching instruction also comprises frequency point information of a target base station or time-frequency resource information of the target base station; sending an SRS based on the SRS configuration information in the switching instruction;

and the terminal equipment receives a target base station indication signaling which at least comprises TA and is sent by the source base station, determines to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switches to the target base station.

16. A handover system, the system comprising:

the source base station is used for selecting a target base station for the terminal equipment; receiving SRS configuration information sent by the target base station, and at least adding the SRS configuration information to a switching instruction; the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or at least adding the configuration information of the SRS and the frequency point information of the target base station into a switching instruction; or the SRS configuration information and the time-frequency resource information of the target base station are added into a switching instruction; sending the switching instruction to the terminal equipment; sending a target base station indication signaling at least containing TA to the terminal equipment;

the target base station is used for configuring the configuration information of the SRS used for timing advance detection for the terminal equipment; sending the configuration information of the SRS to a source base station of the terminal equipment; the SRS configuration information comprises frequency point information of a target base station or time-frequency resource information of the target base station; or, in response to receiving the instruction information of the source base station, sending the frequency point information of the target base station or the time-frequency resource information of the target base station to the source base station; the terminal equipment is also used for detecting SRS sent by the terminal equipment, determining TA corresponding to the terminal equipment based on the detected SRS, and sending the TA to a source base station of the terminal equipment;

the terminal device is configured to receive a handover instruction sent by the source base station, where the handover instruction at least carries SRS configuration information configured by a target base station of the terminal device; the switching instruction also comprises frequency point information of a target base station or time-frequency resource information of the target base station; sending an SRS based on the SRS configuration information in the switching instruction; receiving a target base station indication signaling which at least comprises TA and is sent by the source base station, determining to complete uplink synchronization with the target base station based on the TA in the target base station indication signaling, and switching to the target base station.