CN113475116A

CN113475116A - Time advance acquisition method, network equipment and terminal equipment

Info

Publication number: CN113475116A
Application number: CN201980092836.XA
Authority: CN
Inventors: 尤心; 徐婧
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2021-10-01
Anticipated expiration: 2039-07-05
Also published as: CN113475116B; WO2021003618A1

Abstract

The invention discloses a Time Advance (TA) acquisition method, a terminal device, a network device, a chip, a computer readable storage medium, a computer program product and a computer program, wherein the method comprises the following steps: receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; transmitting an SRS based on the SRS configuration information; and receiving the target TA sent by the first network equipment or the second network equipment.

Description

Time advance acquisition method, network equipment and terminal equipment

Technical Field

The present invention relates to the field of information processing technologies, and in particular, to a method for acquiring a Timing Advance (TA), a network device, a terminal device, a chip, a computer-readable storage medium, a computer program product, and a computer program.

Background

In the handover process, the TA between the terminal device and the target cell is determined through the random access procedure between the terminal device and the target base station, and is acquired by the terminal device after receiving the handover command. However, in the issue of random access reduction handover of R16, it is proposed that the TA can be acquired by the target cell based on the channel Sounding Reference Signal (SRS). However, it has not been determined how to acquire the TA between the UE and the target base station based on the SRS.

Disclosure of Invention

To solve the foregoing technical problem, embodiments of the present invention provide a TA acquisition method, a terminal device, a network device, a chip, a computer-readable storage medium, a computer program product, and a computer program.

In a first aspect, a method for acquiring a timing advance TA is provided, which is applied to a terminal device, and includes:

receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

transmitting an SRS based on the SRS configuration information;

and receiving the target TA sent by the first network equipment or the second network equipment.

In a second aspect, a method for acquiring a TA is applied to a first network device, and the method includes:

indicating the SRS configuration information of the channel sounding reference signal to terminal equipment; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

receiving a target TA sent by second network equipment;

and sending the target TA to the terminal equipment.

In a third aspect, a method for acquiring a time advance is applied to a second network device, and the method includes:

detecting the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

acquiring a target TA based on the detected SRS;

and sending the target TA to first network equipment or terminal equipment.

In a fourth aspect, a terminal device includes:

the first communication unit is used for receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; transmitting an SRS based on the SRS configuration information; and receiving the target TA sent by the first network equipment or the second network equipment.

In a fifth aspect, a first network device includes:

the second communication unit is used for indicating the SRS configuration information of the channel sounding reference signal to the terminal equipment; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; receiving a target TA sent by second network equipment; and sending the target TA to the terminal equipment.

In a sixth aspect, a second network device, comprises:

a third processing unit, which detects the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; acquiring a target TA based on the detected SRS;

and the third communication unit is used for sending the target TA to the first network equipment or the terminal equipment.

In a seventh aspect, a network 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 in the first aspect to the second aspect or each implementation manner thereof.

In an eighth aspect, a chip is provided for implementing the method in the foregoing 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 in any one of the first aspect to the second aspect or the implementation manners thereof.

In a ninth aspect, a computer-readable storage medium is provided for storing a computer program, the computer program causing a computer to perform the method of any one of the first to second aspects or implementations thereof.

A tenth aspect provides a computer program product comprising computer program instructions to cause a computer to perform the method of any one of the first to second aspects or implementations thereof.

In an eleventh aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any one of the first to second aspects or implementations thereof described above.

By adopting the scheme, the SRS configuration information can be sent to the terminal equipment, the terminal equipment sends the SRS according to the configuration, and finally the target TA determined by the second network equipment is obtained. Therefore, the switching process can be further improved, the processing for determining the target TA based on the SRS is increased, the time for determining the target TA in the system is reduced, and the processing efficiency of the system is improved.

Drawings

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

fig. 2 is a first flowchart illustrating a TA acquisition method according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a TA acquisition method according to an embodiment of the present invention;

fig. 4 is a third schematic flowchart of a TA obtaining method according to an embodiment of the present invention;

fig. 5 and 6 are schematic diagrams of a processing flow of handover;

fig. 7-9 are flowcharts illustrating exemplary flows of several TA acquisition methods according to embodiments of the present invention;

fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a first network device according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a second network device according to an embodiment of the present invention;

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

FIG. 14 is a schematic block diagram of a chip provided by an embodiment of the present application;

fig. 15 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

Detailed Description

So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.

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.

The technical scheme of the embodiment of the application can 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 (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

For example, the communication system 100 applied in the embodiment of the present application may be as shown in fig. 1-1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a UE120 (or referred to as a communication terminal, terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with UEs 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 Network device (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 side device 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 also includes at least one UE120 located within the coverage area of the network device 110. "UE" as used herein includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or another UE's device configured to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A UE that is arranged to communicate over a radio interface may be referred to as a "radio communication terminal", "radio terminal" or "mobile terminal".

Optionally, a Device to Device (D2D) communication may be performed between UEs 120.

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.

An embodiment of the present invention provides a TA acquisition method, which is applied to a terminal device, and as shown in fig. 2, includes:

step 21: receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

step 22: transmitting an SRS based on the SRS configuration information;

step 23: and receiving the target TA sent by the first network equipment or the second network equipment.

An embodiment of the present invention further provides a TA obtaining method, applied to a first network device, as shown in fig. 3, including:

step 31: indicating the SRS configuration information of the channel sounding reference signal to terminal equipment; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

step 32: receiving a target TA sent by second network equipment;

step 33: and sending the target TA to the terminal equipment.

An embodiment of the present invention further provides a TA obtaining method, applied to a second network device, as shown in fig. 4, including:

step 41: detecting the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

step 42: acquiring a target TA based on the detected SRS;

step 43: and sending the target TA to first network equipment or terminal equipment.

In the embodiment of the present invention, the first network device may be a source base station of the terminal device, and the second network device may be a target base station of the terminal device.

In this embodiment, the SRS resource type includes one of the following:

aperiodic type, semi-persistent type, periodic type.

The time reference of the SRS transmission is at least one of the following:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.

First, a scenario of the present embodiment is described, and a corresponding switching process may be shown in fig. 5, where the switching process includes:

a switching preparation stage, comprising steps 1-6 in the figure, wherein the first network equipment sends measurement control to the terminal equipment; after the terminal equipment measures a plurality of network equipment or cells, the terminal equipment sends a measurement report to the first network equipment; the first network device makes a handover decision based on the measurement report (or in combination with RRM information); the first network equipment sends a switching request to the second network equipment so that the second network equipment is ready for switching; the second network equipment performs switching permission control according to the switching request; and when the second network equipment determines to carry out switching, the second network equipment sends a switching request confirmation to the first network equipment.

Then, a switching execution phase is performed, which includes steps 7-11 in the figure, specifically: the second network equipment generates a switching request confirmation, sends the switching request confirmation information to the first network equipment, and sends the switching request confirmation information to the terminal equipment through RRC connection reconfiguration information by the first network equipment; after receiving the RRC connection reconfiguration information, the terminal equipment executes switching processing according to the connection reconfiguration information; then the first network equipment sends SN state transmission to the second network equipment; and the terminal equipment synchronizes with the second network equipment, receives the UL resource distributed by the second network equipment and sends RRC connection reconfiguration completion information to the second network equipment.

Finally, entering a switching completion stage, including 12-18 in the figure, specifically: the second network equipment sends a path switching request to the MME to inform the MME that the terminal equipment changes the cell; MME sends a load adjustment request to a service gateway, and MME carries out downlink path switching processing; after the service gateway finishes the processing, the service gateway sends bearer adjustment finishing processing to the MME, and the MME sends a confirmation message of the path switching request to the second network equipment; the second network device informs the first network device of the release of the terminal device context and the release of the resource by the first network device.

Still another switching scenario, for example, for some special scenarios, as shown in fig. 6, such as high-speed movement of the terminal device or high-frequency conditions, frequent switching is required. Conditional handover (Conditional handover) avoids the problem that the handover preparation time is too long, which causes that the time when the terminal equipment needs to be handed over is too late, and a handover command (handover command) is configured in advance for the terminal equipment. On the other hand, for a high-speed rail scene, the operation track of the terminal device is specific, so the first network device may allocate the second network device to the terminal device in advance, and include a condition for triggering the terminal device to perform handover in the handover command, and when the allocated condition is satisfied, the terminal device initiates an access request to the second network device.

With regard to such a handover scenario, it can be supported to configure a plurality of target cells, i.e. to configure a plurality of second network devices. When the terminal device determines based on the configured conditions, it may determine which second network device, i.e. the target cell, to synchronize with according to the conditions that the terminal device satisfies, and access the target cell.

In addition, another switching scenario corresponding to the embodiment may further include the following two architectures:

based on the switching of the double connection, under the condition, when switching, the second network equipment is added as an auxiliary contact (SN), then the SN is changed into a Main Node (MN) through role switching signaling, and finally the first network equipment is released, so that the effect of reducing the interruption time during switching is achieved.

Another architecture is an eMBB-based handover, which is based on the handover procedure in fig. 5, and is different in that when the terminal device receives a handover command (handover command), it continues to maintain connection with the first network device and initiates random access to the second network device, and it is known that the terminal device completes access with the second network device to release the connection of the first network device.

Based on the foregoing description of the handover, the scheme provided by the present embodiment is described in detail with reference to the following examples:

examples one,

Sending the SRS configuration information in the switching command, wherein the SRS configuration information comes from the first network equipment; and the terminal equipment considers that the SRS configuration is activated when receiving the switching command, or determines to transmit the SRS at the resource corresponding to the SRS configuration information.

Referring to fig. 7, the present example is described in detail as follows:

first, a terminal device interacts user data with a network, and a first network device and a second network device (i.e., a source base station and a target base station of the terminal device) acquire mobility control information provided by a core network (AMF).

1. The terminal equipment receives measurement control information sent by the first network equipment, measures based on the measurement control information, and sends a measurement report to the first network equipment;

2. the first network device makes a handover decision, and at this time, the target base station can be determined based on the measurement report, that is, the second network device is determined; it should be noted here that there may be a plurality of target base stations, that is, a plurality of second network devices may be taken out for the terminal device alternatively based on the measurement report, and the second network device in this embodiment may be understood as one of the plurality of second network devices. Of course, which processing manner is adopted in the actual processing may be selected from only one target base station, that is, one second network device, and the embodiment is not limited.

3-5, the first network equipment indicates the SRS configuration information to the second network equipment.

The method also comprises the following steps: and the first network equipment instructs the second network equipment to monitor the SRS based on the SRS configuration information. Specifically, indication information may be sent to the second network device for the first network device, and the second network device may be instructed by the indication information to listen for the SRS based on the SRS configuration information.

Specifically, the first network device may indicate the SRS configuration information and/or the SRS monitoring trigger information to the second network device through a handover request message or a first signaling. Wherein the first signaling can be understood as a new signaling.

The SRS monitoring trigger information may be used to indicate a time when the second network device starts detecting the SRS; alternatively, the second network device may be triggered to start detecting the SRS based on the time when the SRS monitoring trigger information is received.

Further, the SRS monitoring trigger information may further include:

duration of SRS detection and/or time of detection deadline;

or, the SRS monitoring trigger information may further include: time of failure of SRS configuration.

For example, based on the SRS monitoring trigger information, it may be determined to perform SRS monitoring for a period of time; the period of time may be determined by a duration of SRS detection, and at this time, the start and end time points of monitoring may be determined together with a time when the SRS monitoring trigger information is received and the duration. Or, when the SRS monitoring trigger information includes the detection deadline time, determining a time period for monitoring the SRS according to the time when the SRS monitoring trigger information is received and the detection deadline time; alternatively, when the SRS monitoring trigger information includes the indicated time to start detection, the time period for monitoring the SRS may be determined in combination with the SRS detection deadline.

Further, when the SRS monitoring trigger information includes the time when the SRS configuration fails, the second network device (and/or the terminal device) may determine a duration for itself to retain the SRS configuration information according to the time when the SRS configuration information is received and the time when the SRS configuration fails. At this time, the second network device (and/or the terminal device) may delete the SRS configuration information and wait for the next SRS configuration information when the duration of the SRS configuration information is retained is reached. Accordingly, SRS listening and/or SRS transmission may be performed at least part of the time during which the SRS configuration information is valid. At least part of the time can be determined by the second network device and/or the terminal device according to actual conditions or in combination with other information. For example, in the effective period of the SRS configuration information, SRS monitoring may be performed as a partial time according to the duration of SRS detection; in addition, the terminal device may perform SRS transmission at least a part of the time within the effective duration of the SRS configuration information, and the terminal device may set the duration of performing SRS transmission according to an actual situation within the effective duration of the SRS configuration information, where the duration may be shorter than the effective duration of the SRS configuration information; for example, after receiving the SRS configuration information for a certain period of time, the terminal device performs SRS transmission, where the certain period of time may be greater than or equal to 0.

The second network device may perform management control based on the received handover request and the SRS configuration information. At this time, it should be noted that triggering the second network device to start detecting the SRS based on the time when the SRS monitoring trigger information is received may be understood as: the second network equipment determines to trigger the start of SRS detection while receiving the SRS monitoring trigger information;

alternatively, it may be: after receiving a period of time after the SRS monitoring trigger information, the second network equipment determines to trigger the beginning of SRS detection; for example, it may be 0.1 second, etc., and it may be predefined, determined by the network device itself, and indicated by interaction, which is not exhaustive here.

The second network device also feeds back a handover request acknowledge message to the first network device.

Optionally, the second network device may further instruct the first network device to start SRS monitoring, that is, when the second network device starts SRS monitoring, the instruction may be generated, and then the instruction may be sent to the first network device in a handover request acknowledgement message, or the instruction may also be sent in other dedicated information.

6. The first network equipment sends a switching command to the terminal equipment, and the SRS configuration information is carried by the switching command; that is, the SRS configuration information is generated by the first network device, and then the first network device transmits the SRS configuration information to the terminal device through the handover command.

It should be noted that the time reference for SRS transmission may be predefined, or may be notified in the SRS configuration information. The predefining can be understood as predefining in the terminal device, the second network device and the first network device.

7. And the terminal equipment receives the switching command and sends the SRS based on the SRS configuration information carried in the switching command.

The method specifically comprises the following steps: and the terminal equipment receives the switching command message from the first network equipment, and sends the SRS at the corresponding resource position by using the SRS configuration information carried in the switching command message, wherein the SRS is used for the second network equipment to acquire the target TA.

Specifically, sending the SRS based on the SRS configuration information carried in the handover command may include one of the following:

in a first case, if the SRS resource type included in the SRS configuration information is an aperiodic or semi-persistent type, when receiving a handover command carrying the SRS configuration information, the terminal device determines that the SRS resource corresponding to the SRS configuration information is activated, and sends an SRS based on the SRS configuration information. That is, if the configured SRS resource type in the SRS configuration information is an aperiodic (aperiodic) or semi-persistent (semi-persistent) type, the terminal device determines, based on the received handover command carrying the SRS configuration information, that the corresponding SRS resource is activated, and the terminal device transmits the SRS using the corresponding resource.

In the second case, receiving the activated SRS configuration or trigger transmitted by one of the special RRC, MAC CE and DCI, and transmitting the SRS at the SRS resource position corresponding to the SRS configuration information.

In a first case, when receiving a switching command carrying SRS configuration information, a terminal device determines SRS resource activation corresponding to the SRS configuration information, and sends an SRS based on the SRS configuration information, which can be further understood as that the terminal device determines resource activation corresponding to the SRS configuration information at a time when receiving the switching command carrying the SRS configuration information, and sends the SRS according to the SRS configuration information; or, it may also be understood that after a period of time when a handover command carrying the SRS configuration information is received, determining resource activation corresponding to the SRS configuration information, and sending the SRS according to the SRS configuration information.

In the second case, no matter what SRS resource type is indicated in the SRS configuration information, the terminal device does not determine SRS configuration activation or determine transmission on the corresponding resource according to the switching command sent by the SRS configuration information; but determines that the network side activates SRS configuration through other signaling after the handover command, or the network side instructs the terminal device to transmit SRS based on the SRS configuration information, or the terminal device determines that the network side monitors at the corresponding resource. That is, after the handover command, the network side (which may be the first network device) notifies the terminal device to activate SRS configuration through one of dedicated RRC, MAC CE, DCI or trigger SRS transmission in the configured SRS resource location.

Specifically, the information activating SRS configuration may be transmitted to the terminal device through one of dedicated RRC, MAC CE, or DCI, and the terminal device determines to transmit SRS at an SRS resource position corresponding to the SRS configuration information based on the information; the triggering information may also be transmitted to the terminal device through one of dedicated RRC, MAC CE, or DCI, so that the terminal device determines to transmit the SRS at the SRS resource location based on the SRS configuration information.

In this step, the terminal device transmits the SRS based on the SRS configuration information.

Specifically, it may be at least one of the following:

determining SRS sending resources based on the SRS time-frequency resource position indicated in the SRS configuration information;

and determining a timing reference point for SRS transmission and/or a timing advance used for SRS transmission based on predefined SRS transmission time reference information or based on SRS transmission time reference information indicated in the SRS configuration information.

That is, the terminal device may transmit the SRS based on the determined SRS transmission resource, and the timing reference point and/or TA used for SRS transmission.

That is, the terminal device may transmit the SRS based on one of TA 0, TA of the first network device, and a specific TA.

The specific TA may be a predefined TA or a preconfigured TA.

8. The second network equipment detects the SRS based on the SRS configuration information; a target TA is determined based on the detected SRS.

For example, if the terminal device determines that the SRS transmission time reference according to the SRS configuration information is: based on the downlink timing synchronization of the second network device and the UL TA being 0, the terminal device uses the downlink timing synchronization (downlink slot/frame boundary) of the second network device as a timing reference point, and transmits the SRS based on the TA being 0. Correspondingly, after receiving the SRS, the second network device determines the target TA according to the difference between the received SRS time point and the downlink slot/sub frame boundary of the second network device.

For another example, if the time reference for SRS transmission is determined as: and if the downlink timing synchronization and the UL TA of the second network device are the UL TA of the terminal device and the source cell, the terminal device sends the SRS based on the uplink TA of the terminal device and the source cell with the downlink slot/frame boundary of the target cell as a timing reference point. Correspondingly, the SRS received by the second network device has a time adjusted based on the original TA. The second network device determines the relative difference between the target TA and the source TA or the target TA according to the difference between the time point of receiving the SRS and the downlink slot/sub frame boundary of the second network device (i.e. further calculating according to the source TA, and calculating a final TA absolute value, which does not include the influence of the source TA). Optionally, the second network device obtains the source TA through the first network device.

Wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.

The TA difference is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.

9. The terminal equipment receives the target TA sent by the first network equipment or the second network equipment.

That is, the network side notifies the terminal device of the final TA or the TA difference.

The target TA sent to the terminal equipment by the first network equipment or the second network equipment is a TA absolute value or a TA difference value, and the TA absolute value or the TA difference value can be notified to the terminal equipment through indication information in advance; alternatively, it may be determined for the terminal device according to a predefined rule whether the received target TA is represented by a TA absolute value or a TA difference value. The predefined rule may be that the same rule setting is performed in advance in the first network device, the second network device, and the terminal device.

The first network device or the second network device can inform the target TA to the terminal device through the special information;

the dedicated information may be, for example, an RRC message or a MAC CE or DCI.

It should be noted that the dedicated information carrying the target TA is information whose sending time is later than the handover command.

For example, the second network device may directly send the target TA to the terminal device through the dedicated information after determining the target TA;

or, the target TA may also be sent to the first network device for the second network device, and the first network device sends the target TA to the terminal device through the dedicated information.

And then the terminal equipment and the second network equipment perform data transmission, the connection of the first network equipment is released, and the switching is completed.

By the scheme provided by the example, the switching process is perfected, the method for acquiring the target TA by using the SRS is provided, and the time delay of acquiring the target TA is reduced.

The second example is different from the first example in that the SRS configuration information is generated by the second network device, and then the SRS configuration information is sent to the first network device by the second network device, and the SRS configuration information is sent to the middle device by the first network device through a handover command.

This example is explained in connection with fig. 8:

3-4, the first network equipment sends a switching request to the second network equipment, and the second network equipment performs management control; this step is different from the example one in that the SRS configuration information is not carried in the handover request in this step. In addition, during or after the management control performed by the second network device, the second network device may generate the SRS configuration information.

5. The second network device indicates the SRS configuration information to the first network device.

Optionally, the SRS configuration information is indicated to the first network device by the handover request acknowledgement message;

alternatively, the SRS configuration information is indicated to the first network device by a dedicated message.

Further, the second network device may further perform:

after a third time length after the SRS configuration information is indicated to the first network equipment, SRS detection is carried out based on the SRS configuration information;

or after receiving a third duration after the activation instruction sent by the first network device, performing SRS detection based on the SRS configuration information.

That is to say, the second network device performs SRS detection on the relevant resource location after the third duration of the SRS configuration information is sent to the first network device or after the third duration of the activation instruction from the first network device is received (the third duration > -0).

6. And the first network equipment sends a switching command to the terminal equipment, wherein the SRS configuration information is carried by the switching command.

The remaining steps in this example are the same as steps 7-9 of example one and are not described again here.

A third example is different from the first and second examples in that timing for transmitting SRS configuration information is different, a method for a terminal device to determine to transmit an SRS is different, and a method for performing target TA transmission is different, and specifically, the present example is described with reference to fig. 9:

1. The first network device transmits the SRS configuration information to the terminal device through a dedicated RRC message.

Wherein the dedicated RRC message may be: a dedicated RRC message earlier than the handover command transmission time, and/or configuration information for measurement.

That is, the dedicated RRC message may be measurement configuration information and be an RRC message, where a transmission time thereof is earlier than the handover command; alternatively, it is understood that the dedicated RRC message is any message earlier than the handover command.

In this step, the SRS configuration information may be carried in the measurement configuration information; and then the terminal equipment can measure according to the measurement configuration information and carry out measurement reporting.

2-3, after the terminal equipment carries out measurement report, the SRS can be sent. The first network device may make a handover decision according to the measurement report of the terminal device, and the processing of the handover decision is the same as that described above and is not described again.

4. The first network device indicates the SRS configuration information and/or the SRS monitoring triggering information to the second network device.

The SRS configuration information is used for the second network equipment to acquire a target TA;

the SRS monitoring trigger information is used to indicate a time when the second network device starts to detect the SRS resource, or may be used to indicate the second network device to start monitoring.

The indication that the second network device can monitor may be understood as that when the first network device sends the SRS monitoring trigger information to the second network device, the second network device starts to perform SRS monitoring; of course, the SRS monitoring may also be started for a period of time after the second network device receives the SRS monitoring trigger information.

Correspondingly, when only the SRS configuration information sent by the first network device is received and the SRS monitoring trigger information is not received, the second network device detects the SRS or determines that the SRS is activated after receiving the fourth time length of the SRS configuration information. That is, if only the SRS configuration information is indicated and the SRS monitoring trigger information is not indicated, the second network device starts to detect the SRS or considers that the SRS is activated after considering that the SRS configuration is received for a certain period of time (that is, the fourth time length > ═ 0).

Optionally, the first network device indicates the SRS configuration information to the second network device, and/or the SRS monitoring trigger information may be sent at the same time or at different times, and the signaling used may be the same or different. The first network device indicates the SRS configuration information to the second network device, and the SRS configuration information may be carried by the handover request. In addition, the SRS monitoring trigger information may also be carried by the handover request, and certainly may also be carried by other dedicated information, which is not limited here.

Optionally, the indicating, by the first network device, SRS configuration information and/or SRS monitoring trigger information to the second network device includes:

and the first network equipment indicates the SRS configuration information and/or the SRS monitoring trigger information to the second network equipment after receiving a second time length after the terminal equipment measures and reports or sends the information through the special RRC.

That is, the first network device indicates, to the second network device, the SRS configuration information and/or the SRS monitoring trigger information after transmitting information through the dedicated RRC (for example, after transmitting the measurement configuration), or after the first network device receives a Measurement Report (MR) of the terminal device, or after the first network device receives one of the dedicated indication information (for example, the second duration may be a duration greater than or equal to 0) after the SRS of the terminal device starts to be transmitted.

It may be understood that the first network device may consider that the terminal device may transmit the SRS after receiving certain information, or may indicate, in a case that the terminal device may consider that the SRS configuration information has been received, the SRS configuration information and/or the SRS monitoring trigger information to the second network device. Still alternatively, the first network device may send the SRS configuration information and/or the SRS monitoring trigger information to the second network device when determining that the terminal device has started sending the SRS.

Correspondingly, the second network device starts to monitor the SRS after receiving the SRS configuration information and/or the SRS monitoring trigger information sent by the first network device.

Further, it should be noted that, in step 2, it may be determined that the SRS configuration is activated or that the SRS is transmitted on the resource corresponding to the SRS configuration information when the first condition is satisfied for the terminal device.

Wherein the first condition may be at least one of:

a first duration after receiving the dedicated RRC message;

a first time period after receiving the measurement configuration message;

a first duration after the measurement reporting condition is met;

sending a first time length after the measurement report information is sent;

receiving a first time length after the SRS configuration is activated by an instruction sent by first network equipment;

a first duration for the network SRS to begin transmitting is indicated.

The first time period may be set according to practical situations, for example, may be 0.08 second, and the like, and is not limited herein. The first time period may be indicated, preconfigured, self-selected.

The indication information indicating that the network SRS starts to be transmitted, or the indication information indicating that the SRS configuration is activated may be transmitted through one of RRC signaling, MAC CE, and DCI.

It should be further noted that the indication information for instructing the network SRS to start transmission may be: and sending the instruction information of starting sending the SRS to the first network equipment, and/or sending the instruction information of starting sending the SRS to the second network equipment.

And when the first condition is met, the terminal equipment sends the SRS on the SRS resource position. Specifically, at least one of the following may be included:

For example, if it is determined that the time reference for SRS transmission is: based on the downlink timing synchronization of the second network device and the UL TA being 0, the UE transmits the SRS based on TA being 0, with the downlink timing synchronization (downlink slot/frame boundary) of the second network device as a reference point. And after receiving the SRS, the second network equipment determines the target TA according to the difference between the time point of the received SRS and the downlink slot/sub frame boundary of the second network equipment.

For another example, if the time reference for SRS transmission is determined as: and if the downlink timing synchronization and the UL TA of the second network device are the UL TA of the UE and the source cell, the UE sends the SRS based on the uplink timing advance of the UE and the source cell with the downlink slot/frame boundary of the target cell as a reference point. Correspondingly, the SRS received by the second network device has a time adjusted based on the original TA. The second network device determines the relative difference between the target TA and the source TA or the target TA according to the difference between the time point of receiving the SRS and the downlink slot/sub-frame boundary of the second network device (i.e. the second network device further calculates according to the original TA, calculates the final target TA absolute value, and the value does not include the influence of the source TA). The source TA may also be sent to the second network device via the first network device.

5. And the second network equipment receives and detects the SRS at the configured resource position, and acquires the target TA based on the SRS. The target TA is the same as the previous example and is not described again here.

And 6-7, sending the target TA to the terminal equipment.

Similarly, the network side notifies the UE of the final target TA (absolute value) or TA difference value, which may be indicated to the UE by the base station or may be predefined. The same as the first and second examples will not be repeated.

The difference from the first and second examples is that, in this example,

the second network equipment informs the target TA to the first network equipment in the switching request confirmation message;

then, the first network device carries the target TA in the handover command, and the terminal device receives the target TA carried in the handover command by the first network device.

Alternatively, the second network device may also send the target TA to the terminal device through another dedicated RRC message other than the handover command.

And the terminal equipment performs subsequent transmission based on the target TA.

In this example, it is further noted that the SRS configuration information may be generated by the first network device and sent to the second network device as described in step 1 of this example. The SRS configuration information may be generated by the first network device, and then sent to the second network device; in this case, the terminal device may have a plurality of target base stations, that is, there may be a plurality of possible second network devices, and the second network devices may be network devices of cells adjacent to the first network device.

Based on the above examples, another processing method for determining a target TA is provided, in which a first network device pre-estimates a target TA; the first network equipment sends the estimated target TA to the terminal equipment; wherein, the sending target TA can be sent by a dedicated signaling or carried in a handover command; for example, in the first and second examples, the SRS configuration information may be sent together, that is, the handover command carries the SRS configuration information and the estimated target TA; in example three, the SRS configuration information may also be transmitted together with the SRS configuration information, that is, the SRS configuration information and the estimated target TA are carried by the dedicated information.

The terminal equipment transmits the SRS based on the SRS configuration information and the estimated target TA;

the second network equipment determines an updated target TA according to the SRS and sends the updated target TA to the terminal equipment; here, the updated target TA may be directly transmitted to the terminal device by the second network device; the second network device may also send the updated target TA to the first network device, and the first network device transparently transmits the updated target TA to the terminal device; for example, based on examples one and two, the target TA may be sent to the terminal device in a dedicated message (such as one of RRC, MAC CE, DCI) after the handover command; based on example three, the updated target TA may then be sent to the device in a handover command or other RRC dedicated message.

Finally, it should be noted that a plurality of examples in this embodiment propose schemes how to determine the TA between the terminal device and the second network device (i.e. the target base station) based on the SRS; actually, the SRS in the embodiment may be other reference signals or channels, for example, there may be DMRSs, new RSs (for example, reference signals that can be used to acquire a TA), and the like, and accordingly, the SRS configuration information may be understood as configuration information of other reference signals or configuration information of channels, for example, the SRS configuration information may be configuration information of DMRSs or configuration information of new RSs.

Therefore, by adopting the above scheme, the SRS configuration information can be sent to the terminal device, and the terminal device sends the SRS according to the configuration, so as to finally obtain the target TA determined by the second network device. Therefore, the switching process can be further improved, the processing for determining the target TA based on the SRS is increased, the time for determining the target TA in the system is reduced, and the processing efficiency of the system is improved.

An embodiment of the present invention provides a terminal device, as shown in fig. 10, including:

a first communication unit 51, configured to receive SRS configuration information sent by a first network device; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; transmitting an SRS based on the SRS configuration information; and receiving the target TA sent by the first network equipment or the second network equipment.

An embodiment of the present invention further provides a first network device, as shown in fig. 11, including:

a second communication unit 61 configured to indicate the channel sounding reference signal SRS configuration information to the terminal device; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; receiving a target TA sent by second network equipment; and sending the target TA to the terminal equipment.

An embodiment of the present invention further provides a second network device, as shown in fig. 12, including:

a third processing unit 71, configured to detect the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; acquiring a target TA based on the detected SRS;

the third communication unit 72 sends the target TA to the first network device or the terminal device.

In this embodiment, the SRS resource type includes one of the following:

aperiodic type, semi-persistent type, periodic type.

The time reference of the SRS transmission is at least one of the following:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.

examples one,

This example is detailed as follows:

first, the first communication unit 51 of the terminal device interacts user data with the network, and the first network device and the second network device (i.e. the source base station and the target base station of the terminal device) acquire the mobility control information provided by the core network (AMF).

The first communication unit 51 of the terminal device receives the measurement control information sent by the second communication unit 61 of the first network device and performs measurement based on the measurement control information, so as to send a measurement report to the first network device through the first communication unit 51 of the terminal device;

the first network device further includes: the second processing unit 62 performs a handover decision, and at this time, the target base station may be determined based on the measurement report, that is, the second network device is determined; it should be noted here that there may be a plurality of target base stations, that is, a plurality of second network devices may be taken out for the terminal device alternatively based on the measurement report, and the second network device in this embodiment may be understood as one of the plurality of second network devices. Of course, which processing manner is adopted in the actual processing may be selected from only one target base station, that is, one second network device, and the embodiment is not limited.

The second communication unit 61 of the first network device indicates the SRS configuration information to the second network device.

The second communication unit 61 of the first network device may indicate the SRS configuration information and/or the SRS monitoring trigger information to the second network device through a handover request message or a first signaling. Wherein the first signaling can be understood as a new signaling.

Further, the SRS monitoring trigger information may further include:

duration of SRS detection and/or time of detection deadline;

The third processing unit 71 of the second network device may perform management control based on the received handover request and SRS configuration information.

Alternatively, it may be: after receiving the SRS monitoring trigger information for a certain time period, the third processing unit 71 of the second network device determines to trigger the start of detecting the SRS; for example, it may be 0.1 second, etc., and it may be predefined, determined by the network device itself, and indicated by interaction, which is not exhaustive here.

A second communication unit 61 of the first network device sends a switching command to the terminal device, where the SRS configuration information is carried by the switching command; that is, the SRS configuration information is generated by the first network device, and then the first network device transmits the SRS configuration information to the terminal device through the handover command.

The first communication unit 51 of the terminal device receives the handover command, and transmits the SRS based on the SRS configuration information carried in the handover command.

The method specifically comprises the following steps: the first communication unit 51 of the terminal device receives the handover command message from the first network device, and sends an SRS at the corresponding resource location by using the SRS configuration information carried in the handover command message, where the SRS is used for the second network device to obtain the target TA.

in the first case, if the SRS resource type included in the SRS configuration information is an aperiodic or semi-persistent type, when receiving a handover command carrying the SRS configuration information, the first communication unit 51 determines that the SRS resource corresponding to the SRS configuration information is activated, and sends an SRS based on the SRS configuration information. That is, if the configured SRS resource type in the SRS configuration information is an aperiodic (aperiodic) or semi-persistent (semi-persistent) type, the terminal device determines, based on the received handover command carrying the SRS configuration information, that the corresponding SRS resource is activated, and the terminal device transmits the SRS using the corresponding resource.

In the second case, the first communication unit 51 receives the activated SRS configuration or trigger transmitted through one of the dedicated RRC, MAC CE, and DCI, and transmits the SRS at the SRS resource location corresponding to the SRS configuration information.

The terminal device may further include: a first processing unit 52 that performs at least one of:

That is, the first communication unit 51 of the terminal device may transmit the SRS based on one of TA 0, TA of the first network device, and a specific TA.

The specific TA may be a predefined TA or a preconfigured TA.

The third processing unit 71 of the second network device detects the SRS based on the SRS configuration information; a target TA is determined based on the detected SRS.

The first communication unit 51 of the terminal device receives the target TA sent by the first network device or the second network device.

The second communication unit 61 of the first network device or the third communication unit 72 of the second network device may notify the target TA to the terminal device through the dedicated information;

Optionally, the third communication unit 72 of the second network device may further instruct the first network device to start SRS monitoring, that is, when the second network device starts SRS monitoring, the instruction may be generated, and then the instruction may be sent to the first network device in a handover request acknowledgement message, or the instruction may also be sent in other dedicated information.

The second network device indicates the SRS configuration information to the first network device through the third communication unit 72.

Further, the third processing unit 71 of the second network device may further perform:

The second communication unit 61 of the first network device sends a handover command to the terminal device, where the SRS configuration information is carried by the handover command.

The rest of this example is the same as example one and is not described here.

Third, this example is different from the first and second examples in that the timing for transmitting the SRS configuration information is different, the manner in which the terminal device determines to transmit the SRS is also different, and the manner in which the target TA transmission is performed is also different.

The second communication unit 61 of the first network device transmits the SRS configuration information to the terminal device through a dedicated RRC message.

After the first communication unit 51 of the terminal device performs measurement reporting, SRS transmission may be performed.

The second communication unit 61 of the first network device indicates the SRS configuration information and/or the SRS listening trigger information to the second network device.

Optionally, after receiving a second duration after the terminal device measures and reports or sends the information through the dedicated RRC, the second communication unit 61 of the first network device indicates the SRS configuration information and/or the SRS monitoring trigger information to the second network device. Correspondingly, the third processing unit 71 of the second network device starts to monitor the SRS after receiving the SRS configuration information and/or the SRS monitoring trigger information sent by the first network device.

When the first condition is satisfied, the first processing unit 52 of the terminal device determines that SRS configuration is activated or determines to transmit an SRS on a resource corresponding to the SRS configuration information.

Wherein the first condition may be at least one of:

a first duration after receiving the dedicated RRC message;

a first time period after receiving the measurement configuration message;

a first duration after the measurement reporting condition is met;

sending a first time length after the measurement report information is sent;

a first duration for the network SRS to begin transmitting is indicated.

And when the first condition is met, the terminal equipment sends the SRS on the SRS resource position. The specific first processing unit 52 may execute at least one of:

The third processing unit 71 of the second network device receives and detects the SRS at the configured resource location, and acquires the target TA based on the SRS. The target TA is the same as the previous example and is not described again here.

The third communication unit 72 of the second network device sends the target TA to the terminal device.

In the present example, it is shown that,

the third communication unit 72 of the second network device notifies the target TA to the first network device in the handover request acknowledgement message;

then, the second communication unit 71 of the first network device carries the target TA in the handover command, and the terminal device receives the target TA carried in the handover command by the first network device.

Alternatively, the third communication unit 72 of the second network device may also send the target TA to the terminal device by another dedicated RRC message that is not a handover command.

Based on the foregoing examples, another processing manner for determining a target TA is provided, in which a second processing unit of the first network device pre-estimates a target TA; the second communication unit of the first network equipment sends the estimated target TA to the terminal equipment; wherein, the sending target TA can be sent by a dedicated signaling or carried in a handover command; for example, in the first and second examples, the SRS configuration information may be sent together, that is, the handover command carries the SRS configuration information and the estimated target TA; in example three, the SRS configuration information may also be transmitted together with the SRS configuration information, that is, the SRS configuration information and the estimated target TA are carried by the dedicated information.

A first communication unit of the terminal equipment transmits SRS based on SRS configuration information and the estimated target TA;

and the third communication unit of the second network equipment determines the updated target TA according to the SRS and sends the updated target TA to the terminal equipment.

Other functions of the terminal device, the first network device, and the second network device in this embodiment are the same as the processes described in detail in the foregoing method flows, and are not described herein again.

Fig. 13 is a schematic structural diagram of a communication device 1900 according to an embodiment of the present invention, where the communication device in this embodiment may be embodied as a network device in the foregoing embodiment. The communications device 1900 shown in fig. 13 includes a processor 1910, and the processor 1910 can call and run a computer program from a memory to implement the method in the embodiments of the present invention.

Optionally, as shown in fig. 13, the communication device 1900 may also include a memory 1920. From memory 1920, processor 1910 may invoke and execute a computer program, among other things, to implement methods in embodiments of the present invention.

The memory 1920 may be a separate device from the processor 1910 or may be integrated into the processor 1910.

Optionally, as shown in fig. 13, the communication device 1900 may further include a transceiver 1930, and the processor 1910 may control the transceiver 1930 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 1930 may include a transmitter and a receiver, among other things. The transceiver 1930 may further include one or more antennas.

Optionally, the communication device 1900 may specifically be a network device according to the embodiment of the present invention, and the communication device 1900 may implement a corresponding process implemented by the network device in each method according to the embodiment of the present invention, which is not described herein again for brevity.

Optionally, the communication device 1900 may specifically be a terminal device or a network device in the embodiment of the present invention, and the communication device 1900 may implement a corresponding process implemented by a mobile terminal/terminal device in each method in the embodiment of the present invention, and for brevity, details are not described here again.

Fig. 14 is a schematic structural diagram of a chip of an embodiment of the present invention. The chip 2000 shown in fig. 14 includes a processor 2010, and the processor 2010 may call and execute a computer program from a memory to implement the method in the embodiment of the present invention.

Optionally, as shown in fig. 14, the chip 2000 may also include a memory 2020. From the memory 2020, the processor 2010 may call and execute a computer program to implement the method in the embodiment of the present invention.

The memory 2020 may be a separate device from the processor 2010 or may be integrated into the processor 2010.

Optionally, the chip 2000 may further comprise an input interface 2030. The processor 2010 may control the input interface 2030 to communicate with other devices or chips, and specifically, may obtain information or data sent by the other devices or chips.

Optionally, the chip 2000 may further include an output interface 2040. The processor 2010 may control the output interface 2040 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 network device in the embodiment of the present invention, and the chip may implement the corresponding process implemented by the terminal device in each method in the embodiment of the present invention, and for brevity, details are not described here again.

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

It should be understood that the processor of embodiments of the present invention 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 invention 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 invention 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 embodiments of the invention may be either volatile memory or nonvolatile memory, or may 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 invention 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 invention is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 15 is a schematic block diagram of a communication system 2100 provided in an embodiment of the present application. As shown in fig. 15, the communication system 2100 includes a UE2110 and a network device 2120.

The UE2110 may be configured to implement corresponding functions implemented by the terminal device in the foregoing method, and the network device 2120 may be configured to implement corresponding functions implemented by the network device in the foregoing method, which is not described herein again for brevity.

The embodiment of the invention 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 invention, 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 invention, which is not described herein again for brevity.

Embodiments of the present invention also provide a computer program product, which includes computer program instructions.

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

The embodiment of the invention also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present invention, and when the computer program runs on a computer, the computer executes corresponding processes implemented by the network device in the methods in the embodiment of the present invention, which is not described herein again for brevity.

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 invention.

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 embodiments provided in the present invention, 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 invention 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 invention may be embodied in the form of a software product, which is stored in a storage medium and includes 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 invention. 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 invention, but the scope of the present invention 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 invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A method for acquiring a time advance TA is applied to terminal equipment and comprises the following steps:

receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

transmitting an SRS based on the SRS configuration information;

and receiving the target TA sent by the first network equipment or the second network equipment.
The method of claim 1, wherein the SRS resource type includes one of:

aperiodic type, semi-persistent type, periodic type.
The method of claim 1, wherein the time reference for the SRS transmission is at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The method according to any of claims 1-3, wherein the SRS configuration information is carried by a handover command.
The method of claim 4, wherein the method further comprises one of:

if the SRS resource type contained in the SRS configuration information is a non-periodic or semi-continuous type, when a switching command carrying the SRS configuration information is received, determining the SRS resource activation corresponding to the SRS configuration information, and sending an SRS based on the SRS configuration information;

and receiving the activated SRS configuration transmitted by one of the special RRC, the MAC CE and the DCI or triggering the SRS to be transmitted at the SRS resource position corresponding to the SRS configuration information.
The method of claim 5, wherein the method further comprises at least one of:

determining SRS sending resources based on the SRS time-frequency resource position indicated in the SRS configuration information;

and determining a timing reference point for SRS transmission and/or a timing advance used for SRS transmission based on predefined SRS transmission time reference information or based on SRS transmission time reference information indicated in the SRS configuration information.
The method of claim 6, wherein the method further comprises:

and sending the SRS based on the TA being 0, the TA of the first network equipment and one of the specific TA.
The method according to any of claims 1-3, wherein the SRS configuration information is carried by a dedicated RRC message.
The method of claim 8, wherein the dedicated RRC message is: a dedicated RRC message earlier than the transmission time of the handover command, and/or configuration information for measurement.
The method of claim 9, wherein the method further comprises:

when a first condition is met, determining that SRS configuration is activated or determining that an SRS is transmitted on a resource corresponding to the SRS configuration information;

wherein the first condition comprises at least one of:

a first duration after receiving the dedicated RRC message;

a first time period after receiving the measurement configuration message;

a first duration after the measurement reporting condition is met;

sending a first time length after the measurement report information is sent;

receiving a first time length after the SRS configuration is activated by an instruction sent by first network equipment;

a first duration for the network SRS to begin transmitting is indicated.
The method of claim 10, wherein the method further comprises at least one of:

determining SRS sending resources based on the SRS time-frequency resource position indicated in the SRS configuration information;

and determining a timing reference point for SRS transmission and/or a timing advance used for SRS transmission based on predefined SRS transmission time reference information or based on SRS transmission time reference information indicated in the SRS configuration information.
The method of claim 10, wherein the method further comprises:

and sending the SRS based on the TA being 0, the TA of the first network equipment and one of the specific TA.
The method of claim 10, wherein the method further comprises:

and receiving the target TA carried by the first network equipment in the switching command.
The method of any one of claims 1-13, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The method of claim 14, wherein the TA difference is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The method of claim 14, wherein the method further comprises:

and determining the target TA as an absolute TA value or a TA difference value based on the indication information or based on a predefined rule.
A TA acquisition method is applied to a first network device, and comprises the following steps:

indicating the SRS configuration information of the channel sounding reference signal to terminal equipment; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

receiving a target TA sent by second network equipment;

and sending the target TA to the terminal equipment.
The method of claim 17, wherein the SRS resource type comprises one of:

aperiodic type, semi-persistent type, periodic type.
The method of claim 17, wherein the SRS transmission is time referenced to at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The method of any of claims 17-19, wherein the SRS configuration information is carried by a handover command.
The method of claim 20, wherein the method further comprises:

indicating the SRS configuration information to a second network device.
The method of claim 21, wherein the indicating the SRS configuration information to a second network device, the method further comprising:

and indicating the SRS configuration information and/or the SRS monitoring triggering information to second network equipment through a switching request message or first signaling.
The method of any one of claims 17-19, wherein the method further comprises:

and receiving SRS configuration information indicated by the second network equipment.
The method of claim 23, wherein the receiving SRS configuration information indicated by the second network device comprises:

receiving SRS configuration information indicated by the switching request confirmation message by the second network equipment;

or receiving the SRS configuration information indicated by the second network equipment through the dedicated message.
The method of claim 24, wherein the indicating SRS configuration information to the terminal device comprises:

the SRS configuration information is indicated by a handover command transmitted to the terminal device.
The method of any one of claims 20-25, wherein the method further comprises:

and notifying the target TA to the terminal equipment through special information.
The method of claim 26, wherein the dedicated information is: RRC message or MAC CE or DCI.
The method of any one of claims 17-19, wherein the method further comprises:

and sending the SRS configuration information to the terminal equipment through a special RRC message.
The method of claim 28, wherein the dedicated RRC message is: a dedicated RRC message earlier than the transmission time of the handover command, and/or configuration information for measurement.
The method of claim 28, wherein the method further comprises:

and indicating the SRS configuration information and/or the SRS monitoring triggering information to the second network equipment.
The method of claim 30, wherein the indicating SRS configuration information and/or SRS listening trigger information to the second network device comprises:

and after receiving a second time length after the terminal equipment measures and reports the information or sends the information through the special RRC, indicating the SRS configuration information and/or the SRS monitoring trigger information to the second network equipment.
The method of claim 28, wherein the transmitting the target TA to a terminal device comprises:

and sending the target TA carried in the switching command to the terminal equipment.
The method of any one of claims 17-32, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The method of claim 33, wherein the TA difference is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The method of claim 33, wherein the method further comprises:

and determining to send the target TA absolute value or the TA difference value to the terminal equipment based on the indication information or based on a predefined rule.
A time advance acquisition method is applied to a second network device, and comprises the following steps:

detecting the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS;

acquiring a target TA based on the detected SRS;

and sending the target TA to first network equipment or terminal equipment.
The method of claim 36, wherein the SRS resource type comprises one of:

aperiodic type, semi-persistent type, periodic type.
The method of claim 36, wherein the SRS transmission is time referenced to at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The method of any one of claims 36-38, wherein the method further comprises:

and receiving SRS configuration information sent by the first network equipment.
The method of claim 39, wherein when receiving SRS configuration information from a first network device, the method further comprises:

receiving SRS configuration information and/or SRS monitoring trigger information sent by the first network equipment through a switching request message or a first signaling.
The method of any one of claims 36-38, wherein the method further comprises:

the SRS configuration information is indicated to the first network device.
The method of claim 41, wherein the indicating SRS configuration information to the first network device comprises:

indicating the SRS configuration information to the first network equipment through the switching request confirmation message;

alternatively, the SRS configuration information is indicated to the first network device by a dedicated message.
The method of claim 41, wherein the method further comprises:

after a third time length after the SRS configuration information is indicated to the first network equipment, SRS detection is carried out based on the SRS configuration information;

or after receiving a third duration after the activation instruction sent by the first network device, performing SRS detection based on the SRS configuration information.
The method of any one of claims 36-38, wherein the method further comprises:

receiving SRS configuration information and/or SRS monitoring trigger information sent by first network equipment; the SRS monitoring trigger information is used to indicate a time when the second network device starts to detect the SRS.
The method of claim 44, wherein the method further comprises:

and when only the SRS configuration information sent by the first network equipment is received and the SRS monitoring trigger information is not received, after the fourth time length of the SRS configuration information is received, the SRS is detected or the SRS activation is determined.
The method of claim 44, wherein the SRS configuration information is the same or different from a time instant indicated in SRS listening trigger information;

and carrying the SRS configuration information and the SRS monitoring triggering information, wherein the signaling is the same or different.
The method of any one of claims 36-46, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The method of claim 47, wherein the TA difference is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The method of claim 47, wherein the method further comprises:

and determining to send the target TA absolute value or the TA difference value to the terminal equipment based on the indication information or based on a predefined rule.
A terminal device, comprising:

the first communication unit is used for receiving SRS configuration information sent by first network equipment; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); the SRS configuration information comprises at least one of the following: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; transmitting an SRS based on the SRS configuration information; and receiving the target TA sent by the first network equipment or the second network equipment.
The terminal device of claim 50, wherein the SRS resource type includes one of:

aperiodic type, semi-persistent type, periodic type.
The terminal device of claim 50, wherein the time reference for the SRS transmission is at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The terminal device of any of claims 50-52, wherein the SRS configuration information is carried by a handover command.
The terminal device of claim 53, wherein the first communication unit performs one of:

if the SRS resource type contained in the SRS configuration information is a non-periodic or semi-continuous type, when a switching command carrying the SRS configuration information is received, determining the SRS resource activation corresponding to the SRS configuration information, and sending an SRS based on the SRS configuration information;

and determining to transmit the SRS at the SRS resource position corresponding to the SRS configuration information based on the activated SRS configuration or trigger transmitted by one of the special RRC, the MAC CE and the DCI.
The terminal device of claim 54, wherein the terminal device further comprises:

a first processing unit to perform at least one of:

determining SRS sending resources based on the SRS time-frequency resource position indicated in the SRS configuration information;

and determining a timing reference point for SRS transmission and/or a timing advance used for SRS transmission based on predefined SRS transmission time reference information or based on SRS transmission time reference information indicated in the SRS configuration information.
The terminal device of claim 55, wherein the first processing unit determines to transmit the SRS through the first communication unit based on one of TA 0, TA of the first network device, and a specific TA.
The terminal device of any of claims 50-52, wherein the SRS configuration information is carried by a dedicated RRC message.
The terminal device of claim 57, wherein the dedicated RRC message is: a dedicated RRC message earlier than the transmission time of the handover command, and/or configuration information for measurement.
The terminal device of claim 58, wherein the terminal device further comprises:

the first processing unit is used for determining SRS configuration activation or determining that the SRS is transmitted on the resource corresponding to the SRS configuration information when a first condition is met;

wherein the first condition comprises at least one of:

a first duration after receiving the dedicated RRC message;

a first time period after receiving the measurement configuration message;

a first duration after the measurement reporting condition is met;

sending a first time length after the measurement report information is sent;

receiving a first time length after the SRS configuration is activated by an instruction sent by first network equipment;

a first duration for the network SRS to begin transmitting is indicated.
The terminal device of claim 59, wherein the first processing unit performs at least one of:

determining SRS sending resources based on the SRS time-frequency resource position indicated in the SRS configuration information;

and determining a timing reference point for SRS transmission and/or a timing advance used for SRS transmission based on predefined SRS transmission time reference information or based on SRS transmission time reference information indicated in the SRS configuration information.
The terminal device of claim 59, wherein the first processing unit determines to transmit SRS by the first communication unit based on one of TA 0, TA of the first network device, and a specific TA.
The terminal device of claim 59, wherein the first communication unit receives a target TA carried by the first network device in the handover command.
The terminal device of any one of claims 50-62, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The terminal device of claim 63, wherein the TA difference value is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The terminal device of claim 63, wherein the terminal device further comprises:

and the first processing unit determines the target TA as an absolute TA value or a TA difference value based on the indication information or a predefined rule.
A first network device, comprising:

the second communication unit is used for indicating the SRS configuration information of the channel sounding reference signal to the terminal equipment; the SRS configuration information is used to enable the second network device to obtain the target TA; the SRS configuration information includes at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; receiving a target TA sent by second network equipment; and sending the target TA to the terminal equipment.
The first network device of claim 66, wherein the SRS resource types include one of:

aperiodic type, semi-persistent type, periodic type.
The first network device of claim 66, wherein the time reference for SRS transmission is at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The first network device of any one of claims 66-68, wherein the SRS configuration information is carried by a handover command.
The first network device of claim 69, wherein the second communication unit indicates the SRS configuration information to a second network device.
The first network device of claim 70, wherein the second communication unit,

and indicating the SRS configuration information and/or the SRS monitoring triggering information to second network equipment through a switching request message or first signaling.
The first network device of any one of claims 66-68, wherein the second communication unit,

and receiving SRS configuration information indicated by the second network equipment.
The first network device of claim 72, wherein the second communication unit,

receiving SRS configuration information indicated by the switching request confirmation message by the second network equipment;

or receiving the SRS configuration information indicated by the second network equipment through the dedicated message.
The first network device of claim 73, wherein the second communication unit,

the SRS configuration information is indicated by a handover command transmitted to the terminal device.
The first network device of any one of claims 69-74, wherein the second communication unit,

and notifying the target TA to the terminal equipment through special information.
The first network device of claim 75, wherein the specific information is: RRC message or MAC CE or DCI.
The first network device of any one of claims 66-68, wherein the second communication unit is configured to transmit SRS configuration information to a terminal device via a dedicated RRC message.
The first network device of claim 77, wherein the dedicated RRC message is: a dedicated RRC message earlier than the transmission time of the handover command, and/or configuration information for measurement.
The first network device of claim 77, wherein the second communication unit indicates SRS configuration information and/or SRS listening trigger information to a second network device.
The first network device of claim 79, wherein the second communication unit, after receiving a second duration after the terminal device measures and reports or sends information through a dedicated RRC, indicates SRS configuration information and/or SRS monitoring trigger information to the second network device.
The first network device of claim 77, wherein the second communication unit is configured to send the target TA in a handover command to a terminal device.
The first network device of any one of claims 66-81, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The first network device of claim 82, wherein the TA difference value is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The first network device of claim 82, wherein the second communication unit determines to send a target TA absolute value or TA difference value to a terminal device based on indication information or based on a predefined rule.
A second network device, comprising:

a third processing unit, which detects the SRS based on the SRS configuration information of the channel sounding reference signal; the SRS configuration information is used to enable the second network device to obtain a target Timing Advance (TA); including at least one of: the time-frequency resource position of the SRS, the SRS resource type and the time reference for sending the SRS; acquiring a target TA based on the detected SRS;

and the third communication unit is used for sending the target TA to the first network equipment or the terminal equipment.
The second network device of claim 85, wherein the SRS resource type includes one of:

aperiodic type, semi-persistent type, periodic type.
The second network device of claim 85, wherein the time reference for the SRS transmission is at least one of:

an uplink TA based on a first network device;

based on the uplink TA is 0;

based on the specific TA;

downlink synchronization based on a first network device;

based on the downlink synchronization of the second network device.
The second network device of any one of claims 85-87, wherein the third communication unit receives SRS configuration information from the first network device.
The second network device of claim 88, wherein the third communication unit receives SRS configuration information and/or SRS monitoring trigger information sent by the first network device through a handover request message or a first signaling.
The second network device of any one of claims 85-87, wherein the third communication unit indicates SRS configuration information to the first network device.
The second network device of claim 90, wherein the third communication unit indicates SRS configuration information to the first network device through a handover request confirm message;

alternatively, the SRS configuration information is indicated to the first network device by a dedicated message.
The second network device of claim 90, wherein the third processing unit,

after a third time length after the SRS configuration information is indicated to the first network equipment, SRS detection is carried out based on the SRS configuration information;

or after receiving a third duration after the activation instruction sent by the first network device, performing SRS detection based on the SRS configuration information.
The second network device of any one of claims 85 to 87, wherein the third communication unit receives SRS configuration information and/or SRS monitoring trigger information sent by the first network device.
The second network device of claim 93, wherein, when receiving only the SRS configuration information from the first network device and not receiving the SRS monitoring trigger information, the third processing unit detects the SRS or determines SRS activation after receiving the fourth time length of the SRS configuration information.
The second network device of claim 93, wherein the SRS configuration information is the same or different from a time indicated in SRS listening trigger information;

and carrying the SRS configuration information and the SRS monitoring triggering information, wherein the signaling is the same or different.
The second network device of any one of claims 85-95, wherein the target TA is: the absolute value of the TA of the terminal device and the TA of the second network device are the difference value of the TA.
The second network device of claim 96, wherein the TA difference is: the difference between the absolute value of the TA of the terminal device and the second network device and the absolute value of the TA of the terminal device and the first network device.
The second network device of claim 96, wherein the third communication unit determines to send a target TA absolute value or TA difference value to a terminal device based on indication information or based on a predefined rule.
A terminal device, comprising: a processor and a memory for storing a computer program capable of running on the processor,

wherein the memory is adapted to store a computer program and the processor is adapted to call and run the computer program stored in the memory to perform the steps of the method according to any of claims 1-16.
A terminal device, comprising: a processor and a memory for storing a computer program capable of running on the processor,

wherein the memory is adapted to store a computer program and the processor is adapted to call and run the computer program stored in the memory to perform the steps of the method according to any of claims 17-49.
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 1-16.
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 17-49.
A computer readable storage medium for storing a computer program for causing a computer to perform the steps of the method according to any one of claims 1 to 49.
A computer program product comprising computer program instructions to cause a computer to perform the method of any one of claims 1 to 49.
A computer program for causing a computer to perform the method of any one of claims 1-49.