WO2017080247A1

WO2017080247A1 - Synchronization method and device

Info

Publication number: WO2017080247A1
Application number: PCT/CN2016/090458
Authority: WO
Inventors: 吴昱民
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-11-11
Filing date: 2016-07-19
Publication date: 2017-05-18
Also published as: CN106686669A; CN106686669B

Abstract

Disclosed are a synchronization method and device. The method comprises: receiving first system frame number (SFN) difference information between a source cell and a target cell and information of a subframe position where a terminal (UE) starts transmitting and receiving data in the target cell sent by a source base station, wherein the first SFN difference information is determined by negotiation and interaction between the source base station and a target base station, and the information of subframe position is determined according to the first SFN difference information; determining an actual subframe position where the transmission and reception of data starts in the target cell according to the first SFN difference information and the information of subframe position; and performing downlink synchronization with the target cell according to the determined actual subframe position.

Description

Synchronization method and device

Technical field

The present application relates to, but is not limited to, the field of communications, and more particularly to a synchronization method and apparatus.

Background technique

1 is a flowchart of a terminal handover cell in a related art. After a source base station sends a handover command or simultaneously initiates a data forwarding process to a target base station, the process after the handover command is sent is as follows:

Step S102: After receiving the handover command, the UE performs downlink synchronization with the target cell, including frequency synchronization and time synchronization.

Step S104: The UE waits for an opportunity for available random access.

Step S106: The UE initiates a random access request at an available random access opportunity.

Step S108: After receiving the random access request of the UE, the target eNB sends a random access response and an uplink timing advance (Timing Advance) to the UE.

Step S110: The UE adjusts the uplink timing to perform uplink synchronization.

Step S112: The target cell sends data to the UE.

2 is a schematic diagram of signal synchronization between different cells in the related art. As can be seen from FIG. 2, signal synchronization between different cells can be classified into three levels according to strictness: subframe boundary alignment, subframe number alignment, and system frame number ( System Frame Number (SFN) is number aligned.

The SFN difference information includes the difference between the different cells: the SFN number; the difference of the subframe number; the difference of the subframe boundary.

The UE measures the signal of the source cell and the target cell, and reads the respective SFN numbers in the system information of the source cell and the target cell, so that the difference between the SFN of the downlink signal of the source cell and the target cell can be measured. The UE can report the measurement result to the network side according to the network configuration.

The SFN difference between the source cell and the target cell on the network side can be obtained by the network side, such as the operation, management, and maintenance (OAM) management.

After receiving the downlink signal, the UE may determine the location of the downlink signal subframe. In order to avoid uplink interference, the network needs to ensure that the signals sent by different UEs arrive at a fixed time. Therefore, the network side needs to configure an uplink timing advance (Timing Advance, abbreviated as TA) for the uplink transmission of the UE. After receiving the TA value, if the UE wants to send an uplink signal, the UE performs the uplink signal transmission by using the subframe position of the next line as the reference and the advance TA time value.

About the acquisition of the TA value. The UE only needs to obtain the TA value in the uplink out-of-synchronization state. Therefore, the UE may trigger the UE to initiate the random access procedure, and the network side sends the TA value to the UE in the random access response.

About the maintenance of the TA value. Since the location of the UE is constantly changing, it is necessary to maintain the validity of the TA value. On the network side, the value of the TA is maintained. You can set a timer for the TA value of the UE. When the TA is sent to the UE, the network sends a new TA value to the UE before the timer expires. The maintenance of the TA value of the UE is started or restarted when the TA value is received according to the timer set by the network side. After the timer expires, the TA value is considered to be invalid, and the behavior of the UE is out of synchronization, and the uplink cannot be lost. The cell sends an uplink signal.

The method of synchronizing the terminal with the target cell in the related art causes a long data interruption time and affects the normal operation of the service. Therefore, an effective solution has not been proposed for this problem.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

This document provides a synchronization method and device to solve the problem that at least the terminal and the target cell existing in the related art are synchronized, which causes a long data interruption time and affects the normal operation of the service.

According to an aspect of the embodiments of the present invention, a synchronization method includes: receiving, by a source base station, first system frame number SFN difference information between a source cell and a target cell, and starting, transmitting, and receiving, by the terminal UE in the target cell. Sub-frame position information of the data, where the first SFN difference information is determined by the source base station and the target base station by negotiation interaction, and the subframe position information is according to the Determining, by the first SFN difference information, determining, according to the first SFN difference information and the subframe position information, an actual subframe position in which data is started to be transceived in the target cell; according to the determined actual subframe The location is downlink synchronized with the target cell.

Optionally, after performing downlink synchronization with the target cell according to the determined actual subframe position, the method further includes: determining second SFN difference information between the source cell and the target cell; Determining, by the SFN difference information, the second SFN difference information, and a predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell, determining a second uplink for uplink synchronization with the target cell a TA value; performing uplink synchronization with the target cell according to the determined second TA value.

Optionally, determining the second SFN difference information between the source cell and the target cell includes: determining a subframe boundary of the target cell; and determining, according to the subframe boundary of the target cell, the predetermined source The difference between the subframe boundaries of the cell determines the second SFN difference information.

Optionally, determining, according to the first SFN difference information, the second SFN difference information, and a predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell, The second TA value when the target cell performs uplink synchronization includes one of the following: when the predetermined subframe boundary of the source cell is before the determined subframe boundary of the target cell, the foregoing formula is determined by the following formula a second TA value TA _T :TA _T =D _UE +TA _S -D _NW ; when the predetermined subframe boundary of the source cell is after the determined subframe boundary of the target cell, the method is determined by the following formula The second TA value TA _T :TA _T =TA _S -(D _UE +D _NW ); wherein, the TA _S is the first TA value, and the D _UE is the second SFN corresponding to the second SFN difference information The difference, D _NW is the first SFN difference corresponding to the first SFN difference information.

According to another aspect of the present invention, a synchronization method is provided, including: determining, by means of a negotiation interaction with a target base station, a first system frame number SFN difference information between a source cell and a target cell of a terminal UE, and the Transmitting, by the UE, the subframe position information of the data in the target cell, and sending the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the location The subframe position information is used to indicate that the UE determines an actual subframe position in which the data is started to be transceived in the target cell, and performs downlink synchronization with the target cell according to the determined actual subframe position.

According to another aspect of an embodiment of the present invention, a synchronization method is provided, including: with a source base station Determining the first system frame number SFN difference information between the source cell and the target cell of the terminal UE and the subframe position information of the UE starting to transmit and receive data in the target cell by using a negotiation interaction manner; and using the first SFN The difference information and the subframe position information are sent to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines to start sending and receiving data in the target cell. The actual subframe position is downlink synchronized with the target cell according to the determined actual subframe position.

According to another aspect of the present invention, a synchronization apparatus is provided, including: a receiving module, configured to: receive, by a source base station, a first system frame number SFN difference information between a source cell and a target cell, and a terminal UE And the first SFN difference information is determined by the source base station and the target base station by using a negotiation interaction, where the subframe position information is according to the first Determining, by the SFN difference information, the first determining module is configured to: determine, according to the first SFN difference information and the subframe position information, an actual subframe position that starts to send and receive data in the target cell; The module is configured to: perform downlink synchronization with the target cell according to the determined actual subframe position.

Optionally, the apparatus further includes: a second determining module, configured to: after performing downlink synchronization with the target cell according to the determined actual subframe position, determining between the source cell and the target cell The second SFN difference information is configured to: set, according to the first SFN difference information, the second SFN difference information, and a predetermined first uplink when performing uplink synchronization with the source cell The timing advance TA value determines a second TA value for performing uplink synchronization with the target cell; and the second synchronization module is configured to perform uplink synchronization with the target cell according to the determined second TA value.

Optionally, the second determining module includes: a first determining unit, configured to: determine a subframe boundary of the target cell; and a second determining unit, configured to: determine, according to a subframe boundary of the target cell, and a predetermined The difference of the subframe boundaries of the source cell determines the second SFN difference information.

Optionally, the third determining module determines the second SFN difference information by using one of the following manners: when a predetermined subframe boundary of the source cell is before determining the subframe boundary of the target cell when determining the second TA TA value _T by the following _{_{formula: TA T = D UE + TA}} S -D NW; when the target sub-sub-cell of predetermined frame boundary of the source cell is determined frame when the boundary after determining the second TA TA value _T by the following _{_{formula: TA T = TA S - (}} D UE + D NW); wherein, said first _S TA TA value, D _UE to the second The second SFN difference value corresponding to the SFN difference information, and D _NW is the first SFN difference value corresponding to the first SFN difference information.

According to another aspect of the present invention, a synchronization apparatus is provided, including: a fourth determining module, configured to: determine, by means of negotiation interaction with a target base station, a first system frame between a source cell and a target cell of a terminal UE No. SFN difference information and subframe position information of the UE starting to transmit and receive data in the target cell; the first sending module is configured to: send the first SFN difference information and the subframe position information to The UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines an actual subframe position in which data is started to be transceived in the target cell and according to the determined actual sub-subject The frame position is downlink synchronized with the target cell.

According to another aspect of the present invention, a synchronization apparatus is provided, including: a fifth determining module, configured to: determine, by means of negotiation interaction with a source base station, a first system frame between a source cell and a target cell of a terminal UE No. SFN difference information and subframe position information of the UE starting to transmit and receive data in the target cell; the second sending module is configured to: send the first SFN difference information and the subframe position information to The UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines an actual subframe position in which data is started to be transceived in the target cell and according to the determined actual sub-subject The frame position is downlink synchronized with the target cell.

According to another aspect of an embodiment of the present invention, there is provided a computer readable storage medium storing computer executable instructions that are implemented by a processor to implement the above method.

According to the embodiment of the present invention, the first system frame number SFN difference information between the source cell and the target cell and the subframe position information in which the terminal UE starts to send and receive data in the target cell are used, where the The first SFN difference information is determined by the source base station and the target base station by negotiation, and the subframe position information is determined according to the first SFN difference information; according to the first SFN difference information and the Determining the subframe position information determines an actual subframe position in which the data is started to be transceived in the target cell; and performing downlink synchronization with the target cell according to the determined actual subframe position. When the synchronization between the terminal and the target cell in the related art is solved, the data interruption time is long, which affects the normal operation of the service, thereby reducing the data interruption time when the terminal synchronizes with the target cell, and ensuring the normal service. The effect of running.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a flowchart of a terminal handover cell in the related art;

2 is a schematic diagram of signal synchronization between different cells in the related art;

3 is a flow chart of a first synchronization method in accordance with an embodiment of the present invention;

4 is a flow chart of a second synchronization method according to an embodiment of the present invention;

FIG. 5 is a flowchart of a third synchronization method according to an embodiment of the present invention; FIG.

6 is a schematic diagram 1 of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention;

7 is a flowchart of a terminal handover cell according to an embodiment of the present invention;

8 is a second schematic diagram of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention;

9 is a third schematic diagram of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention;

Figure 10 is a block diagram showing the structure of a first synchronizing apparatus according to an embodiment of the present invention;

11 is a block diagram showing an optional structure of a first synchronizing apparatus according to an embodiment of the present invention;

FIG. 12 is a structural block diagram of a second determining module 112 in a first synchronization apparatus according to an embodiment of the present invention;

Figure 13 is a block diagram showing the structure of a second synchronizing apparatus according to an embodiment of the present invention;

Figure 14 is a block diagram showing the structure of a third synchronizing apparatus according to an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present specification and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order.

A synchronization method is provided in this embodiment. FIG. 3 is a flowchart of a first synchronization method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S302: Receive a first system frame number SFN between the source cell and the target cell sent by the source base station. And the difference information and the subframe location information that the terminal UE starts to send and receive data in the target cell, where the first SFN difference information is determined by the source base station and the target base station through negotiation, and the subframe position information is according to the first SFN. Determining the difference information;

Step S304, determining, according to the first SFN difference information and the subframe position information, an actual subframe position in which data is started to be transmitted and received in the target cell;

Step S306, performing downlink synchronization with the target cell according to the determined actual subframe position.

The foregoing operation may be performed by the terminal, and determining, according to the first SFN difference information and the subframe position information, the actual subframe position of starting and receiving data in the target cell, according to the SFN number and the subframe number of the source cell. Determining at least one of the subframe boundaries, the SFN number, the subframe number, and the subframe of the target cell may be determined according to at least one of the SFN number of the source cell, the subframe number, the subframe boundary, and the first SFN difference value. At least one of the boundaries is based on subframe position information transmitted by the source base station (the subframe position information is determined by the network side, but the terminal does not know where the subframe position is, so further determining the actual subframe is needed. The above related information of the location and the target cell determines the actual subframe position at which the terminal starts transmitting and receiving data in the target cell. The foregoing related information of the source cell may be acquired when the terminal performs data interaction with the source base station, so that when the source cell needs to be handed over to the target cell, the information that has been acquired in advance may be directly used for switching.

Through the above steps, the first SFN difference between the source cell and the target cell on the network side and the subframe position information in which the UE starts to transmit and receive data in the target cell are determined by the source base station and the target base station, and then sent to the UE, thereby The terminal does not need to perform multiple data interactions with the source base station and the target base station to obtain the first SFN difference and the actual subframe position in which the data is started to be sent and received in the target cell, which saves time, shortens data interruption time, and ensures normal service. run. Therefore, when the terminal and the target cell existing in the related art are synchronized, the data interruption time is long, and the normal operation of the service is affected, thereby reducing the data interruption time when the terminal synchronizes with the target cell, and ensuring the service. The effect of normal operation.

In an optional embodiment, after performing downlink synchronization with the target cell according to the determined actual subframe position, the method further includes: determining second SFN difference information between the source cell and the target cell; according to the first SFN difference The value information, the second SFN difference information, and the predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell are determined for uplink synchronization with the target cell. a second TA value; performing uplink synchronization with the target cell according to the determined second TA value. The foregoing uplink synchronization process and the downlink synchronization process may also be performed simultaneously, that is, the foregoing second SFN difference information may also be acquired in the process of downlink synchronization. The implementation of the embodiment may be a terminal. Therefore, by using the embodiment, the terminal may determine (for example, may determine by a predetermined algorithm or determine according to other manners) a second TA value for uplink synchronization with the target cell, Therefore, there is no need to send the network side, which saves data interruption time. Shorten the time for the terminal to synchronize with the target base station for uplink synchronization.

In an optional embodiment, determining the second SFN difference information between the source cell and the target cell includes: determining a subframe boundary of the target cell; and determining, according to the subframe boundary of the target cell, a predetermined source cell The difference of the frame boundaries determines the second SFN difference information. The subframe boundary of the target cell may be determined when performing downlink synchronization with the target cell.

In an optional embodiment, determining, according to the first SFN difference information, the second SFN difference information, and a predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell, a second value TA is one of uplink synchronization comprising: said source cell when the sub-frame boundary is a predetermined time before the determination of the target cell sub-frame boundaries may be determined second TA TA value _T by the following formula: TA _T = D _UE + TA _{S -} D _NW ; When the predetermined subframe boundary of the source cell is after the subframe boundary of the determined target cell, the second TA value TA _T can be determined by the following formula: TA _T = TA _S - (D _UE + D _NW ); wherein, TA _S is a first TA value, D _UE is a second SFN difference corresponding to the second SFN difference information, and D _NW is a first corresponding to the first SFN difference information. A SFN difference.

FIG. 4 is a flowchart of a second synchronization method according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:

Step S402, determining, by means of a negotiation interaction with the target base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE and the subframe position information of the UE starting to transmit and receive data in the target cell;

Step S404, the first SFN difference information and the subframe position information are sent to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines the actual subframe position in which the data is started to be sent and received in the target cell. Performing downlink synchronization with the target cell according to the determined actual subframe position.

The foregoing operation may be performed by the source base station of the UE. Through the above steps, the first SFN difference between the source cell and the target cell on the network side and the subframe position information in which the UE starts to transmit and receive data in the target cell are determined by the source base station and the target base station, and then sent to the UE, thereby The terminal does not need to perform multiple data interactions with the source base station and the target base station to obtain the first SFN difference and the actual subframe position in which the data is started to be sent and received in the target cell, which saves time, shortens data interruption time, and ensures normal service. run. Therefore, when the downlink synchronization between the terminal and the target cell in the related art is solved, the data interruption time is long, and the normal operation of the service is affected, thereby reducing the data interruption time when the terminal and the target cell perform downlink synchronization. The effect of ensuring the normal operation of the business.

FIG. 5 is a flowchart of a third synchronization method according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:

Step S502, determining, by means of a negotiation interaction with the source base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the subframe position information of the UE starting to transmit and receive data in the target cell;

Step S504, the first SFN difference information and the subframe position information are sent to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines the actual subframe position in which the data is started to be sent and received in the target cell. Perform downlink synchronization with the target cell according to the determined actual subframe position.

The foregoing operation may be performed by the target base station of the UE. Through the above steps, the first SFN difference between the source cell and the target cell on the network side and the subframe position information in which the UE starts to transmit and receive data in the target cell are determined by the source base station and the target base station, and then sent to the UE, thereby The terminal does not need to perform multiple data interactions with the source base station and the target base station to obtain the first SFN difference and the actual subframe position in which the data is started to be sent and received in the target cell, which saves time, shortens data interruption time, and ensures normal service. run. Therefore, when the terminal and the target cell existing in the related art are synchronized, the data interruption time is long, and the normal operation of the service is affected, thereby reducing the data interruption time when the terminal synchronizes with the target cell, and ensuring the service. The effect of normal operation.

The present application is described below in conjunction with the embodiments:

Embodiment 1:

In this embodiment, the subframe boundary of the source cell measured by the UE is before the target cell boundary given by the network (ie, the network side), and the subframe boundary of the source cell measured by the UE is the subframe boundary of the target cell. Previously, as shown in FIG. 6, FIG. 6 is a schematic diagram 1 of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention.

FIG. 7 is a flowchart of a terminal handover cell according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps:

Step S702: The source base station and the target base station negotiate a subframe position at which the UE starts transmitting and receiving data after the UE switches to the target cell. The source base station and the target base station need to exchange the SFN difference information of the source cell and the target cell (corresponding to the first SFN difference information), and determine, by using the difference information, that the UE starts to send and receive data after switching to the target cell. Subframe position. The negotiation process may adopt a handover preparation process or other inter-base station signaling procedures. The SFN difference information of the source cell and the target cell may be sent by the source base station to the target base station, or may be sent by the target base station to the source base station.

Step S704: The source base station sends a handover command (RRC Connection Reconfiguraton) to the UE. If the UE is in the uplink synchronization state in the source cell, the UE sends the SFN difference information between the source cell and the target cell on the network side and the subframe position information in which the UE starts transmitting and receiving data in the target cell.

Step S706: The UE according to the SFN number/subframe number/subframe boundary of the source cell, and the SFN difference information between the source cell and the target cell on the network side sent in step S704, and the UE configured on the network side starts in the target cell. The subframe position information of the data is transmitted and received, and the actual subframe position at which the data is started to be transmitted and received after the target cell handover is determined. And determining, according to the actual subframe position, a synchronization process with the target cell, to determine a subframe boundary of the target cell, and determining, according to the determined difference between the subframe boundary of the target cell and the subframe boundary of the predetermined source cell, the UE side receiving. The downlink SFN difference between the source cell and the target cell of the signal (corresponding to the second SFN difference information described above). For the subframe boundary of the source cell and the target cell measured by the UE on the network side, if the subframe boundary of the source cell measured by the UE is before the target cell boundary given by the network, the subframe boundary of the source cell measured by the UE It is before the subframe boundary of the target cell, as shown in FIG. 6. Then, the UE may calculate a TA value (corresponding to the second TA value described above) obtained in the target cell, and acquire uplink synchronization in the target cell. The calculation method is as follows:

TA _T = D _UE + TA _{S -} D _NW ;

TA _T : TA value of the target cell (corresponding to the second TA value described above).

TA _S : TA value of the source cell (corresponding to the first TA value described above).

D _NW : SFN difference between the source cell and the target cell on the network side (corresponding to the first SFN difference value described above).

D _UE : SFN difference between the source cell and the target cell measured by the UE (corresponding to the second SFN difference value described above).

Step S708: According to the network configuration, the UE may send an uplink signal in the target cell.

Step S710: The network side may send data to the UE according to the location of the UE that starts transmitting and receiving the subframe at the target cell, or may send the data to the UE after receiving the uplink signal of the UE in step S708. The UE may start to send and receive data according to the location of the subframe that is sent to the UE at the target cell. It is also possible to start transmitting and receiving data in the target cell after step S708.

Step S712: The network side sends uplink grant information to the UE. This step can be performed simultaneously with step S710.

Step S714: The UE sends an uplink data or an RRC Connection Reconfiguration Complete message to the network side according to the uplink grant information.

Embodiment 2:

In this embodiment, the subframe boundary of the source cell measured by the UE is after the target cell boundary given by the network, and the subframe boundary of the source cell measured by the UE is before the subframe boundary of the target cell, as shown in FIG. 8. 8 is a second schematic diagram of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention.

The steps of this embodiment are the same as those in the first embodiment. In step S706, for the subframe boundary of the source cell and the target cell measured by the UE on the network side, if the subframe boundary of the source cell measured by the UE is after the target cell boundary given by the network, the source cell measured by the UE The subframe boundary is before the subframe boundary of the target cell, as shown in FIG. Then, the UE can calculate the TA value obtained in the target cell, and acquire the uplink synchronization in the target cell. The calculation method is as follows:

TA _T = D _UE + TA _{S -} D _NW ;

TA _T : TA value of the target cell.

TA _S : TA value of the source cell.

D _NW : SFN difference between the source cell and the target cell on the network side.

D _UE : The SFN difference between the source cell and the target cell measured by the UE.

Embodiment 3:

In this embodiment, the subframe boundary of the source cell measured by the UE is after the target cell boundary given by the network, and the subframe boundary of the source cell measured by the UE is after the subframe boundary of the target cell, as shown in FIG. FIG. 9 is a third schematic diagram of a subframe boundary of a source cell and a target cell according to an embodiment of the present invention.

The steps of this embodiment are the same as those in the first embodiment. In step S706, for the subframe boundary of the source cell and the target cell measured by the UE on the network side, if the subframe boundary of the source cell measured by the UE is after the target cell boundary given by the network, the source cell measured by the UE The subframe boundary is after the subframe boundary of the target cell, as shown in FIG. Then, the UE can calculate the TA value obtained in the target cell, and acquire the uplink synchronization in the target cell. The calculation method is as follows:

TA _T =TA _S -(D _NW +D _UE );

TA _T : TA value of the target cell.

TA _S : TA value of the source cell.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on the understanding, the technical solution of the embodiment of the present invention may be embodied in the form of a software product stored in a storage medium (such as a ROM/RAM, a magnetic disk, an optical disk), and includes a plurality of instructions for making A terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) performs the method described in the embodiments of the present invention.

In this embodiment, a synchronization device is also provided, which is used to implement the foregoing embodiments and optional implementations, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments can be implemented in software, hardware, or a combination of software and hardware, is also possible and conceived. of.

FIG. 10 is a structural block diagram of a first synchronization apparatus according to an embodiment of the present invention. As shown in FIG. 10, the apparatus includes a receiving module 102, a first determining module 104, and a first synchronization module 106. .

The receiving module 102 is configured to: receive, by the source base station, the first system frame number SFN difference information between the source cell and the target cell, and the subframe location information that the terminal UE starts to send and receive data in the target cell, where the first SFN The difference information is determined by the source base station and the target base station through negotiation, and the subframe position information is determined according to the first SFN difference information. The first determining module 104 is connected to the receiving module 102, and is configured to: according to the first The SFN difference information and the subframe position information determine an actual subframe position at which the data is started to be transmitted and received in the target cell. The first synchronization module 106 is connected to the first determining module 104, and is configured to: according to the determined actual subframe position and the target cell. Perform downlink synchronization.

11 is a block diagram showing an optional structure of a first synchronization apparatus according to an embodiment of the present invention. As shown in FIG. 11, the apparatus includes a second determination module 112 and a third determination in addition to all the modules shown in FIG. The module 114 and the second synchronization module 116 are described below.

The second determining module 112 is connected to the first synchronization module 106, and configured to: after performing downlink synchronization with the target cell according to the determined actual subframe position, determining second SFN difference information between the source cell and the target cell; The third determining module 114 is connected to the second determining module 112, and is configured to: according to the first SFN difference information, the second SFN difference information, and the predetermined first uplink timing advance when performing uplink synchronization with the source cell. The TA value determines a second TA value for uplink synchronization with the target cell. The second synchronization module 116 is connected to the third determining module 114, and is configured to perform uplink synchronization with the target cell according to the determined second TA value.

FIG. 12 is a structural block diagram of a second determining module 112 in a first synchronization apparatus according to an embodiment of the present invention. As shown in FIG. 12, the second determining module 112 includes a first determining unit 122 and a second determining unit 124. The second determination module 112 is described.

The first determining unit 122 is configured to: determine a subframe boundary of the target cell; the second determining unit 124 is connected to the first determining unit 122, and is configured to: according to the subframe boundary of the target cell and the predetermined source cell The difference of the subframe boundaries determines the second SFN difference information.

In an optional embodiment, the foregoing third determining module may determine the second SFN difference information by using one of the following manners: when the predetermined subframe boundary of the source cell is before the determined subframe boundary of the target cell , it is possible to determine the second value TA TA _T by the following _{_{formula: TA T = D UE + TA}} S -D NW; the target cell when the sub-sub-frame boundary determined in advance in the source cell is determined frame boundaries Thereafter, when the second value TA TA _T can be determined by the following _{_{equation: TA T = TA S - (}} D UE + D NW); wherein, _S is the first TA value TA, D _UE is the difference information corresponding to a second SFN The second SFN difference, D _NW is the first SFN difference corresponding to the first SFN difference information.

FIG. 13 is a structural block diagram of a second synchronization apparatus according to an embodiment of the present invention. As shown in FIG. 13, the apparatus includes a fourth determination module 132 and a first transmission module 134, which will be described below.

The fourth determining module 132 is configured to: determine, by means of negotiation and interaction with the target base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the subframe position where the UE starts to send and receive data in the target cell. The first sending module 134 is connected to the fourth determining module 132, and configured to: send the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used. The UE is instructed to determine an actual subframe position in which data is started to be transceived in the target cell, and performs downlink synchronization with the target cell according to the determined actual subframe position.

14 is a block diagram showing the structure of a third synchronizing apparatus according to an embodiment of the present invention. As shown in FIG. 14, the apparatus includes a fifth determining module 142 and a second transmitting module 144, which will be described below.

The fifth determining module 142 is configured to: determine, by means of negotiation and interaction with the source base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the subframe position where the UE starts to send and receive data in the target cell. The second sending module 144 is connected to the fifth determining module 142, and configured to: send the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used. The UE is instructed to determine an actual subframe position in which data is started to be transceived in the target cell, and performs downlink synchronization with the target cell according to the determined actual subframe position.

It should be noted that the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are respectively located in multiple processes. In the device.

Embodiments of the present invention also provide a storage medium. Optionally, in this embodiment, the above The storage medium can be configured to store program code for performing the following steps:

S11. The first system frame number SFN difference information between the source cell and the target cell that is sent by the source base station, and the subframe position information that the terminal UE starts to send and receive data in the target cell, where the first SFN difference information is a source. Determining, by the base station and the target base station, by negotiation, the subframe position information is determined according to the first SFN difference information;

S12. Determine, according to the first SFN difference information and the subframe position information, an actual subframe position that starts to send and receive data in the target cell.

S13. Perform downlink synchronization with the target cell according to the determined actual subframe position.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S21: Determine a first system frame number SFN difference information between a source cell and a target cell of the terminal UE, and a subframe position information that the UE starts to send and receive data in the target cell, by performing a negotiation interaction with the target base station;

S22, the first SFN difference information and the subframe position information are sent to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines the actual subframe position in which the data is started to be sent and received in the target cell, and according to The determined actual subframe position is downlink synchronized with the target cell.

S31. Determine, by means of a negotiation, the source base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the subframe position information that the UE starts to send and receive data in the target cell.

S32, the first SFN difference information and the subframe position information are sent to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines an actual subframe position that starts to send and receive data in the target cell, and according to The determined actual subframe position is downlink synchronized with the target cell.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

Optionally, in this embodiment, the processor executes according to the stored program code in the storage medium. The above steps.

For example, the examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

The method described in the embodiment of the present invention can assist the UE to acquire the downlink and uplink synchronization of the target cell more quickly during the handover process, thereby reducing the data interruption time of the handover process.

It will be apparent to those skilled in the art that the above-described modules or steps of the embodiments of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed either separately as an integrated circuit module, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present application, and various changes and modifications may be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Industrial applicability

The embodiment of the present invention solves the problem that when the terminal and the target cell are synchronized in the related art, the data interruption time is long, and the normal operation of the service is affected, thereby reducing the data interruption when the terminal synchronizes with the target cell. Time to ensure the normal operation of the business.

Claims

A synchronization method that includes:

And receiving, by the source base station, the first system frame number SFN difference information between the source cell and the target cell, and the subframe location information that the terminal UE starts to send and receive data in the target cell, where the first SFN difference information is Determining, by the source base station and the target base station, the subframe position information is determined according to the first SFN difference information;

Determining, according to the first SFN difference information and the subframe position information, an actual subframe position in which data is started to be transceived in the target cell;

Performing downlink synchronization with the target cell according to the determined actual subframe position.
The method according to claim 1, wherein after performing downlink synchronization with the target cell according to the determined actual subframe position, the method further includes:

Determining second SFN difference information between the source cell and the target cell;

Determining, according to the first SFN difference information, the second SFN difference information, and a predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell, for performing uplink with the target cell The second TA value of the synchronization;

Performing uplink synchronization with the target cell according to the determined second TA value.
The method of claim 2, wherein determining the second SFN difference information between the source cell and the target cell comprises:

Determining a subframe boundary of the target cell;

And determining, according to a difference between a subframe boundary of the target cell and a predetermined subframe boundary of the source cell, the second SFN difference information.
The method according to claim 3, wherein the first uplink timing advance amount TA when uplink synchronization is performed with the source cell according to the first SFN difference information, the second SFN difference information, and a predetermined The second TA value when the value is determined to be used for uplink synchronization with the target cell includes one of the following:

When a predetermined sub-frame boundaries of the source cell is the target cell before the sub-frame boundary is determined, it is determined by the following formula said second value TA TA T:

TA T = D UE + TA S - D NW ;

When a predetermined sub-frame boundaries of the source cell is the target cell after the sub-frame boundary is determined, determining a second value TA TA T by the following formula:

TA T =TA S -(D UE +D NW );

The TA S is the first TTL value, and the D UE is the second SFN difference corresponding to the second SFN difference information, and the D NW is the first SFN difference corresponding to the first SFN difference information.
A synchronization method that includes:

Determining, by means of a negotiation, the target base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the subframe position information of the UE starting to send and receive data in the target cell;

Transmitting the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines the target The actual subframe position of the data is started to be transmitted and received in the cell, and downlink synchronization is performed with the target cell according to the determined actual subframe position.
A synchronization method that includes:

Determining the first system frame number SFN difference information between the source cell and the target cell of the terminal UE and the subframe position information of the UE starting to transmit and receive data in the target cell, by performing a negotiation interaction with the source base station;

Transmitting the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used to indicate that the UE determines the target The actual subframe position of the data is started to be transmitted and received in the cell, and downlink synchronization is performed with the target cell according to the determined actual subframe position.
A synchronization device comprising:

The receiving module is configured to: receive, by the source base station, the first system frame number SFN difference information between the source cell and the target cell, and the subframe location information that the terminal UE starts to send and receive data in the target cell, where the The SFN difference information is determined by the source base station and the target base station by negotiation, and the subframe position information is determined according to the first SFN difference information;

a first determining module, configured to: according to the first SFN difference information and the subframe position information Determining an actual subframe position at which the data is started to be transmitted and received in the target cell;

The first synchronization module is configured to: perform downlink synchronization with the target cell according to the determined actual subframe position.
The apparatus of claim 7 further comprising:

a second determining module, configured to: after performing downlink synchronization with the target cell according to the determined actual subframe position, determining second SFN difference information between the source cell and the target cell;

a third determining module, configured to: determine, according to the first SFN difference information, the second SFN difference information, and a predetermined first uplink timing advance amount TA value when performing uplink synchronization with the source cell a second TA value for uplink synchronization with the target cell;

The second synchronization module is configured to: perform uplink synchronization with the target cell according to the determined second TA value.
The apparatus of claim 8, wherein the second determining module comprises:

a first determining unit, configured to: determine a subframe boundary of the target cell;

The second determining unit is configured to: determine the second SFN difference information according to a difference between a subframe boundary of the target cell and a predetermined subframe boundary of the source cell.
The apparatus according to claim 9, wherein said third determining module determines said second SFN difference information by one of:

When a predetermined sub-frame boundaries of the source cell is the target cell before the sub-frame boundary is determined, it is determined by the following formula said second value TA TA T:

TA T = D UE + TA S - D NW ;

When a predetermined sub-frame boundaries of the source cell is the target cell after the sub-frame boundary is determined, determining a second value TA TA T by the following formula:

TA T =TA S -(D UE +D NW );

The TA S is the first TTL value, and the D UE is the second SFN difference corresponding to the second SFN difference information, and the D NW is the first SFN difference corresponding to the first SFN difference information.
A synchronization device comprising:

The fourth determining module is configured to: determine, by means of a negotiation interaction with the target base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the UE starts to send and receive data in the target cell. Subframe position information;

The first sending module is configured to: send the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used to indicate The UE determines an actual subframe position in which the data is started to be transceived in the target cell, and performs downlink synchronization with the target cell according to the determined actual subframe position.
A synchronization device comprising:

The fifth determining module is configured to: determine, by means of a negotiation interaction with the source base station, the first system frame number SFN difference information between the source cell and the target cell of the terminal UE, and the UE starts to send and receive data in the target cell. Subframe position information;

The second sending module is configured to: send the first SFN difference information and the subframe position information to the UE, where the first SFN difference information and the subframe position information are used to indicate The UE determines an actual subframe position in which the data is started to be transceived in the target cell, and performs downlink synchronization with the target cell according to the determined actual subframe position.