WO2015090017A1

WO2015090017A1 - System frame number synchronization method, device and system

Info

Publication number: WO2015090017A1
Application number: PCT/CN2014/080078
Authority: WO
Inventors: 王国争; 李军; 楼红伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-12-18
Filing date: 2014-06-17
Publication date: 2015-06-25
Also published as: CN104735769A

Abstract

A system frame number synchronization method, device and system, which relate to the field of wireless communications and solve the problem of SFN synchronization among different cells. The method comprises: a current serving cell verifying an SFN deviation between same and a target cell; and according to the SFN deviation between same and the target cell, the current serving cell conducting SFN synchronization with the target cell. The technical solution provided in the present invention is suitable for an LTE system, thereby realizing SFN synchronization among different cells.

Description

System frame number synchronization method, device and system

Technical field

The present invention relates to the field of wireless communications, and in particular, to a system frame number (SFN) synchronization method, apparatus, and system.

Background technique

In order to meet the needs of users for seamless coverage and higher data rate services, next-generation broadband wireless communication systems will focus on higher data rates, higher spectrum and power utilization, improved cellular average throughput and improved edge user performance. System design requirements. The Long Term Evolution LTE project is the largest new technology development project initiated by 3GPP. It improves and enhances 3G air access technology, using OFDM and MIMO as its wireless network evolution standard.

The radio frame of the LTE system is numbered by the system frame number (SFN for short), ranging from 0 to 1023. In the LTE system, different cells can have different SFNs at the same time.

With the development of LTE technology, some new LTE technologies, such as ABS and CoMP, have been proposed. If the same SFN is used at the same point in time between different cells using these techniques, the solution to achieve these techniques can be greatly simplified. Summary of the invention

Embodiments of the present invention provide a system frame number synchronization method, apparatus, and system, which solve the problem of SFN synchronization between different cells.

In order to solve the above technical problem, the following technical solutions are used: A system frame number synchronization method, including:

The current serving cell confirms the deviation from the system frame number (SFN) of the target cell;

The current serving cell performs SFN synchronization with the target cell according to an SFN deviation from the target cell. Optionally, the step of the current serving cell confirming the deviation from the SFN of the target cell includes: acquiring, by the current serving cell, an SFN of the target cell;

The current serving cell subtracts the current SFN of the current serving cell from the SFN of the target cell, and obtains a deviation from the SFN of the target cell. Optionally, the step of the current serving cell acquiring the SFN of the target cell includes: determining, by the current serving cell, the SFN of the target cell by using broadcast information of the target cell. Optionally, the step that the current serving cell subtracts the current SFN of the current serving cell from the SFN of the target cell to obtain a deviation from the SFN of the target cell includes:

While the current serving cell acquires the SFN of the target cell, the SFN of the current serving cell at the moment is recorded;

The current serving cell uses the difference between the SFN of the current serving cell and the SFN of the target cell as the deviation between the current serving cell and the SFN of the target cell.

Optionally, the step of the current serving cell performing SFN synchronization with the target cell according to an SFN deviation from the target cell includes:

The current serving cell adjusts the SFN of the current serving cell and the SFN of the target cell according to the SFN deviation from the target cell. A system frame number synchronization device includes a deviation determination module and a synchronization module, wherein

The deviation determining module is configured to: determine a deviation of the SFN between the current serving cell and the target cell; the synchronization module is configured to:: according to the SFN deviation of the current serving cell and the target cell, the current serving cell and the The target cell performs SFN synchronization. Optionally, the deviation determining module includes a target cell SFN acquiring unit and a deviation calculating unit, where:

The target cell SFN acquiring unit is configured to: acquire an SFN of the target cell;

The deviation calculation unit is configured to: subtract the SFN of the target cell from the current SFN of the current serving cell, and obtain a deviation from the SFN of the target cell. Optionally, the target cell SFN acquiring unit includes a first acquiring subunit, where: the first acquiring subunit is configured to: determine, by using broadcast information of the target cell, an SFN of the target cell. Optionally, the deviation calculation unit includes a recording subunit and a calculation subunit, where: the recording subunit is configured to: record the SFN of the current serving cell at the same time, while acquiring the SFN of the target cell ;

The calculating subunit is configured to: use a difference between the SFN of the current serving cell and the SFN of the target cell as a deviation between the current serving cell and the SFN of the target cell.

Optionally, the synchronization module is configured to perform SFN synchronization between the current serving cell and the target cell according to an SFN deviation from the target cell according to the current serving cell:

Adjusting, according to the SFN deviation of the current serving cell and the target cell, the SFN of the current serving cell and the SFN of the target cell. A system frame number synchronization system includes a current serving cell and a target cell;

The current serving cell is set to confirm a deviation from the SFN of the target cell, and performs SFN synchronization with the target cell according to an SFN deviation from the target cell.

An embodiment of the present invention provides a system frame number synchronization method, apparatus, and system, where a current serving cell confirms a deviation from an SFN of a target cell, and the current serving cell according to an SFN deviation from the target cell, The target cell performs SFN synchronization, thereby implementing SFN synchronization between different cells, and solving the problem of SFN synchronization between different cells. DRAWINGS

1 is a flowchart of a system frame number synchronization method according to Embodiment 1 of the present invention; FIG. 2 is a schematic diagram of an implementation principle of a system frame number synchronization method according to Embodiment 1 of the present invention; A schematic structural diagram of a system frame number synchronization apparatus provided in Example 2; FIG. 4 is a schematic structural diagram of the deviation determining module 301 of FIG. detailed description

In the LTE system, different cells can have different SFNs at the same time.

With the development of LTE technology, some new LTE technologies, such as ABS and CoMP, have been proposed. If the same SFN is used at the same point in time between different cells using these techniques, the solution to achieve these techniques can be greatly simplified.

In order to solve the above problems, embodiments of the present invention provide a system frame number synchronization method, apparatus, and system. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application can be arbitrarily combined with each other.

First, the first embodiment of the present invention will be described with reference to the accompanying drawings.

The embodiment of the invention provides a system frame number synchronization method, which achieves SFN synchronization by eliminating the SFN deviation between the current serving cell and the target cell. In the embodiment of the present invention, Cell-1 is used as the current serving cell, and Cell-2 is the target cell as an example.

In the embodiment of the present invention, the step of synchronizing the SFN of the current serving cell Cell-1 with the SFN of the target cell Cell-2 is as shown in FIG. 1 , and includes:

Step 101: The current serving cell confirms a deviation from the SFN of the target cell.

In this step, the current serving cell acquires the SFN of the target cell, and the current serving cell subtracts the SFN of the target cell from the current SFN of the current serving cell, and obtains a deviation from the SFN of the target cell.

Optionally, the current serving cell may determine an SFN of the target cell by using broadcast information of the target cell.

Specifically, the current serving cell records the SFN of the current serving cell at the same time as the SFN of the target cell, and then subtracts the difference of the SFN of the target cell from the SFN of the current serving cell. The deviation between the current serving cell and the SFN of the target cell. Cell-1 obtains the target cell Cell-2 The SFN at the current time is SFN-2. At this time, the SFN of Cell-1 is SFN-1, then the SFN of the target cell Cell-1 and the cell of the target cell of the current serving jurisdiction can be determined. The deviation of SFN of 2 is deltaSFN = SFN-1 - SFN-2.

Step 102: The current serving cell performs SFN synchronization with the target cell according to an SFN deviation from the target cell.

In this step, based on the deltaSFN determined by step 101, Cell-1 adjusts the SFN of the current serving cell Cell-1 and the SFN of Cell-2, such as subtracting the deltaSFN from the SFN of Cell-1.

FIG. 2 is a schematic diagram of a SFN synchronization principle according to an embodiment of the present invention. Before the SFN synchronization adjustment, the SFN of Cell-2 and the SFN of Cell-1 are deltaSFN, and the SFN of Cell-2 and the SFN of Cell-1 are the same after the SFN synchronization adjustment.

Embodiment 2 of the present invention will be described below with reference to the accompanying drawings.

The embodiment of the invention provides a system frame number synchronization device. The structure of the device is as shown in FIG. 3, and includes:

The deviation determining module 301 is configured to confirm a deviation between the current serving cell and the SFN of the target cell. The synchronization module 302 is configured to set the current serving cell and the target according to an SFN deviation between the current serving cell and the target cell. The cell performs SFN synchronization.

Optionally, the structure of the deviation determining module 301 is as shown in FIG. 4, and includes:

a target cell SFN obtaining unit 401, configured to acquire an SFN of the target cell;

The deviation calculation unit 402 is configured to subtract the SFN of the target cell from the current SFN of the current serving cell to obtain a deviation from the SFN of the target cell.

The target cell SFN obtaining unit 401 includes:

The first obtaining subunit 4011 is configured to determine an SFN of the target cell by using broadcast information of the target cell.

The deviation calculation unit 402 includes:

The recording sub-unit 4021 is configured to record the SFN of the current serving cell at the moment while acquiring the SFN of the target cell; The calculating sub-unit 4022 is configured to use the difference between the SFN of the current serving cell and the SFN of the target cell as the deviation between the current serving cell and the SFN of the target cell.

The above system frame number synchronization device can be integrated in the current serving cell, and the corresponding function is completed by the current serving cell.

The embodiment of the invention further provides a system frame number synchronization system, including a current serving cell and a target cell;

The system frame number synchronization apparatus and system provided by the embodiments of the present invention can be combined with the system frame number synchronization method provided by the embodiment of the present invention, and the current serving cell confirms the deviation from the target cell SFN, and the current serving cell Performing SFN synchronization with the target cell according to the SFN deviation from the target cell, thereby implementing SFN synchronization between different cells, and solving the problem of SFN synchronization between different cells.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any particular combination of hardware and software.

The various devices/function modules/functional units in the above embodiments may be implemented using a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

Each device/function module/function unit in the above embodiment is implemented in the form of a software function module. And when sold or used as a stand-alone product, it can be stored on a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like. Any changes or substitutions that are readily conceivable within the scope of the present invention are intended to be included within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Industrial Applicability The embodiment of the present invention provides a system frame number synchronization method, apparatus, and system, where a current serving cell confirms a deviation from an SFN of a target cell, and the current serving cell according to an SFN deviation from the target cell The target cell performs SFN synchronization. Thereby, SFN synchronization between different cells is realized, and the problem of SFN synchronization between different cells is solved, and therefore the present invention has strong industrial applicability.

Claims

claims

1. A system frame number synchronization method, including:

The deviation between the system frame number (SFN) of the current serving cell and the target cell;

The current serving cell performs SFN synchronization with the target cell based on the SFN deviation from the target cell.

2. The system frame number synchronization method according to claim 1, wherein the step of confirming the deviation of the current serving cell from the SFN of the target cell includes:

The current serving cell obtains the SFN of the target cell;

The current serving cell subtracts the SFN of the target cell from the current SFN of the current serving cell to obtain a deviation from the SFN of the target cell.

3. The system frame number synchronization method according to claim 2, wherein the step of obtaining the SFN of the target cell by the current serving cell includes:

The current serving cell determines the SFN of the target cell through the broadcast information of the target cell.

4. The system frame number synchronization method according to claim 2, wherein the current serving cell subtracts the SFN of the target cell from the current SFN of the current serving cell to obtain the deviation from the SFN of the target cell. Steps include:

While acquiring the SFN of the target cell, the current serving cell records the SFN of the current serving cell at that moment;

The difference between the SFN of the current serving cell and the SFN of the target cell is used as the deviation between the SFN of the current serving cell and the target cell.

5. The system frame number synchronization method according to any one of claims 1 to 4, wherein the step of performing SFN synchronization between the current serving cell and the target cell according to the SFN deviation between the current serving cell and the target cell includes:

According to the SFN deviation between the current serving cell and the target cell, the current serving cell adjusts the SFN of the current serving cell to be consistent with the SFN of the target cell.

6. A system frame number synchronization device, including a deviation determination module and a synchronization module, wherein The deviation determination module is configured to: confirm the deviation of the SFN of the current serving cell and the target cell; the synchronization module is configured to: based on the SFN deviation of the current serving cell and the target cell, determine the deviation between the current serving cell and the target cell. The target cell performs SFN synchronization.

7. The system frame number synchronization device according to claim 6, wherein the deviation determination module includes a target cell SFN acquisition unit and a deviation calculation unit, wherein:

The target cell SFN acquisition unit is configured to: acquire the SFN of the target cell;

The deviation calculation unit is configured to: subtract the SFN of the target cell from the current SFN of the current serving cell to obtain a deviation from the SFN of the target cell.

8. The system frame number synchronization device according to claim 7, wherein the target cell SFN acquisition unit includes a first acquisition subunit, wherein: the first acquisition subunit is configured to: broadcast through the target cell information to determine the SFN of the target cell.

9. The system frame number synchronization device according to claim 7, wherein the deviation calculation unit includes a recording subunit and a calculation subunit, wherein:

The recording subunit is configured to: while obtaining the SFN of the target cell, record the SFN of the current serving cell at that moment;

The calculation subunit is configured to: use the difference between the SFN of the current serving cell and the SFN of the target cell as the deviation of the SFN of the current serving cell and the target cell.

10. The system frame number synchronization method according to any one of claims 6-9, the synchronization module is configured to synchronize the current serving cell according to the SFN deviation from the target cell in the following manner. The serving cell performs SFN synchronization with the target cell:

According to the SFN deviation between the current serving cell and the target cell, the SFN of the current serving cell is adjusted to be consistent with the SFN of the target cell.

11. A system frame number synchronization system, including a current serving cell and a target cell; wherein the current serving cell is set to confirm the deviation from the SFN of the target cell, and based on the SFN deviation from the target cell, and the target cell. The target cell performs SFN synchronization.