CN104684069B

CN104684069B - Configuration method, node and system for realizing air interface synchronization

Info

Publication number: CN104684069B
Application number: CN201410036888.4A
Authority: CN
Inventors: 苟伟; 邬华明; 赵亚军; 李儒岳; 彭佛才; 韩晓钢
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2013-11-29
Filing date: 2014-01-24
Publication date: 2020-09-11
Anticipated expiration: 2034-01-24
Also published as: CN104684069A; WO2015078221A1

Abstract

The invention discloses a configuration method for realizing air interface synchronization, which comprises the following steps: a network side determines the number of layers divided by cells through an operation, administration and maintenance (OAM) mode or a given node, configures a listening subframe position for air interface synchronization for each determined layer of cells, and sends or configures the number of layers and information of the listening subframe position configured for each layer of cells; or, the network side determines a source cell of which the air interface can be used for listening synchronization in an OAM manner, configures cell information corresponding to the source cell, and configures the cell information as the cell; or, the given node determines a source cell with an air interface synchronization available for listening in the cell, configures cell information corresponding to the source cell, and sends the cell information as the cell. The invention also discloses a node and a system for realizing the air interface synchronous configuration.

Description

Configuration method, node and system for realizing air interface synchronization

Technical Field

The present invention relates to the field of mobile wireless communications, and in particular, to a configuration method, node, and system for implementing air interface synchronization.

Background

In a Long Term Evolution (LTE) system, a synchronization scheme of a small cell (small cell) and a macro cell (macro) is currently researched and is an air interface-based synchronization scheme, and the basic principle is as follows: the small cell receives a Cell Reference Signal (CRS) of the macro cell, so that the time deviation between the small cell and the macro cell is calculated, the timing of the small cell is calibrated, and the aim of synchronizing with the macro cell is fulfilled.

Currently, a multicast/multicast single frequency network (MBSFN) subframe-based mode has been determined to be studied as a basis for air interface synchronization. The basic principle of the MBSFN subframe based mode is as follows:

small cell sends CRS through listening to macro cell, herein, listening means receiving, that is: the Small cell receives the CRS sent by the macro cell, so that the Small cell and the macro cell are synchronized; meanwhile, the small cell configures the subframe (namely, the listening subframe) which receives the CRS from the macro cell into the MBSFN subframe and sends the MBSFN subframe to the subordinate User Equipment (UE).

However, by adopting the method, a serious interference problem exists among the small cells, because the subframe position information for listening needs to be interacted among the small cells, especially under the condition that the distribution density of the small cells is high, the interference becomes extremely serious, and the synchronization effect of the small cells is seriously influenced. In order to overcome the above interference problem, it has been proposed to use the existing Resource (RE) or subframe muting (muting) method to solve the problem, but if each small cell independently configures its own subframe location for listening, it means that other cells need to keep muting at the subframe location of each small cell for listening, and obviously, the resource that needs muting is multiplied.

In addition, considering that adjacent macro cells may not be synchronized in a Frequency Division Duplex (FDD) system, if small cell1 under macro cell1 hears small cell2 under the neighboring cell or small cell reference signal under macro cell2 for null synchronization, it is obvious that small cell1 may assume synchronization with macro cell1, but in fact, small cell1 does not maintain synchronization with macro cell 1.

Disclosure of Invention

In order to solve the existing technical problem, embodiments of the present invention provide a configuration method, a node, and a system for implementing air interface synchronization.

The embodiment of the invention provides a configuration method for realizing air interface synchronization, which comprises the following steps:

a network side determines the number of layers divided by cells through an operation, administration and maintenance (OAM) mode or a given node, configures a listening subframe position for air interface synchronization for each determined layer of cells, and sends or configures the number of layers and information of the listening subframe position configured for each layer of cells; or,

a network side determines a source cell of air interface synchronization available for listening in the cell in an OAM mode, configures cell information corresponding to the source cell, and configures the cell information as the cell; or,

the given node determines a source cell with an air interface synchronization available for listening in the cell, configures cell information corresponding to the source cell, and sends the cell information as the cell.

An embodiment of the present invention further provides a configuration method for implementing air interface synchronization, where the method includes:

a relevant cell receives the number of layers of cell division configured by an OAM mode and information of a listening subframe position configured by each layer of cell for air interface synchronization; or,

the related cell receives the information of the divided layer number and the subframe position of the listening for the air interface synchronization configured in each layer of cell; or,

a relevant cell receives cell information corresponding to a source cell configured with air interface synchronization for listening; or,

and the related cell receives cell information corresponding to the source cell which is configured in an OAM mode and used for listening to the air interface synchronization.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, where the node includes: a configuration module and a sending module; wherein,

the configuration module is used for determining the number of layers of cell division and configuring the position of the listening sub-frame for air interface synchronization for each layer of determined cell; or, the method is used for determining a source cell with a synchronous air interface which can be used for listening in the cell, configuring cell information corresponding to the source cell, and configuring the cell information as the cell;

the sending module is configured to send or configure the number of layers and the information of the listening subframe position configured for each layer of cell; or, the cell information is used for sending the cell information to the local cell.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, where the node includes: a receiving module, configured to receive the number of layers of cell division configured in an OAM manner and information of subframe positions configured for air interface synchronization of each layer of cells;

or, the method is used for receiving the information of the number of divided layers and the subframe position of the listening for air interface synchronization configured in each layer of cell; or,

the method comprises the steps of receiving cell information corresponding to a source cell configured with air interface synchronization for listening; or,

the method is used for receiving cell information corresponding to the source cell which is configured in an OAM mode for listening and has an air interface synchronization.

An embodiment of the present invention further provides a system for implementing air interface synchronization configuration, where the system includes: two of the nodes described above.

An embodiment of the present invention further provides a configuration method for implementing air interface synchronization, where the method includes: the method comprises the steps that the local cell receives air interface synchronous reference signals of a plurality of cells, a source cell or a candidate source cell suitable for the local cell is determined from the air interface synchronous reference signals, and the determined source cell information or candidate source cell information is notified to the source cell or a given node.

An embodiment of the present invention further provides a configuration method for implementing air interface synchronization, where the method includes: a source cell receives source cell information or candidate source cell information notified by the cell;

and the source cell information or the candidate source cell information is determined by the cell from the air interface synchronous reference signals of a plurality of cells, and is suitable for the source cell or the candidate source cell of the cell.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, where the node includes: the device comprises a receiving module and a notification module; wherein,

the receiving module is used for receiving air interface synchronization reference signals of a plurality of cells and determining a source cell or a candidate source cell suitable for the cell;

and the notifying module is used for notifying the source cell information or the candidate source cell information determined by the receiving module to a source cell or a given node.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, where the node includes: a receiving module, configured to receive source cell information or candidate source cell information notified by a local cell;

In the configuration method, node, and system for implementing air interface synchronization provided in the embodiments of the present invention, a network side determines the number of layers divided by a cell in an operation, administration, and maintenance OAM manner or by a given node, configures a listening subframe position for air interface synchronization for each layer of determined cell, and sends or configures the number of layers and information of the listening subframe position configured for each layer of cell; or, the network side determines a source cell of which the air interface can be used for listening synchronization in an OAM manner, configures cell information corresponding to the source cell, and configures the cell information as the cell; or, the given node determines a source cell with an air interface synchronization available for listening in the cell, configures cell information corresponding to the source cell, and sends the cell information as the cell. Therefore, the embodiment of the invention adopts the unified node to configure the position and the layer number of the sub-frame for listening, thereby being beneficial to the implementation of the sub-frame multicasting or RE multicasting scheme, greatly reducing the resource needing multicasting and avoiding the signaling interaction. Otherwise, the subframe position information for listening needs to be interacted among the small cells, so that other small cells configure subframe positions for listening in the small cells.

In addition, after the embodiment of the invention informs that the small cell can be used as the cell information of the source cell, the method and the device are favorable for simplifying the steps and the calculation complexity of listening to the small cell, and the problem that the small cell is mistakenly synchronized with the macro cell is solved.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.

Fig. 1 is a flowchart of a configuration method for implementing air interface synchronization according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a configuration node for implementing air interface synchronization according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a configuration node for implementing air interface synchronization according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a configuration node for implementing air interface synchronization according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of a configuration node for implementing air interface synchronization according to another embodiment of the present invention.

Detailed Description

The following embodiments of the present invention will be described in detail with reference to the accompanying examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

An embodiment of the present invention provides a configuration method for implementing air interface synchronization, and as shown in fig. 1, the method includes:

step 101 (a): the network side determines the number of layers of cell division through the modes of operation, management and maintenance OAM, or a given node determines the number of layers of cell division;

step 102 (a): configuring a listening subframe position for air interface synchronization for each layer of determined cell, and sending or configuring the layer number and information of the listening subframe position configured for each layer of cell;

or,

step 101 (b): a network side determines a source cell of air interface synchronization which can be used for listening in the cell by an OAM mode;

step 102 (b): the network side configures cell information corresponding to the source cell and configures the cell information as the local cell;

or,

step 101 (c): a given node determines a source cell (also called a target cell, that is, a candidate source cell for air interface synchronization that a target cell can use for listening) of air interface synchronization that the cell can use for listening;

step 102 (c): and configuring cell information corresponding to the source cell by the given node, and sending the cell information as the cell.

Preferably, the given node is a macro cell. Of course, the given node may also be a designated smallcell.

For example, in some cases, some small cells or a cluster of small cells are deployed, but the small cells are not covered by macro, and at this time, a certain small cell may be selected as a given node, and information of candidate source cells of the small cells may be configured; or selecting one small cell from one small cell cluster as a given node, and configuring the information of the candidate source cells of other small cells in the cluster.

Wherein the source cell is: the cell providing air interface synchronization for other cells is explained in detail later.

Wherein the cell information corresponding to the air interface synchronization source cell available for listening includes: frequency point information of the cell and a cell physical ID; or,

the method comprises the following steps: frequency point information of a cell, a cell physical ID and bandwidth information; or,

the cell information corresponding to the air interface synchronization source cell that can be used for listening includes: information of a cell cluster where a source cell is located; alternatively, it comprises: frequency point information of the cell, cell physical ID and timing difference information.

The timing difference information is specifically timing difference information describing a cell corresponding to the physical ID of the cell and a macro to which the cell belongs.

The specific sending mode of the cell information corresponding to the air interface synchronization source cell which can be used for listening is as follows: the data may be sent over the air interface, or through a wired interface, such as X2, or referred to as a backhaul link, or through an S1 interface in a core network on the network side. For example, a given node transmits over port X2; for example, the given node sends (via port S1) to the core network, and the core network sends the packet to the local cell via port S1.

The specific sending time of the cell information corresponding to the air interface synchronization source cell which can be used for listening is as follows: the sending may be performed after the source cell is initially selected by the cell, or may be performed before the source cell is not initially selected by the cell. For the latter, when the cell is deployed, a connection is established with any cell, after the connection is established, the cell finds that a part can be used as a cell of a candidate source cell through measurement, and reports the cell to a given node, and then the given node determines the candidate source cell after comprehensive consideration (including the factors of the number of layers and the geographic position) and sends the cell to the cell.

Preferably, when the local cell is a small cell, the configured source cell (also a candidate source cell) includes: a small cell belonging to the same macro cell (or called local macro, that is, the macro to which the local cell belongs) as the local cell, and the macro cell.

Preferably, when the cell is a small cell, the method further includes:

and when the given node determines that the adjacent macro cell keeps synchronous with the given node, determining the adjacent macro cell and the small cell thereof as a candidate source cell or a source cell of air interface synchronization used for listening by the cell.

Preferably, the method further comprises: the given node selects one or more cells from the received information of the potential source cells as candidate source cells or source cells of the cell; or, the given node designates a cell as a source cell of the cell; or, the local cell selects one cell from the candidate source cells as the source cell of the local cell.

In a preferred example, for an initially deployed small cell, the small cell can acquire information of nearby cells (which are potential source cells) through measurement, the small cell notifies the information of the nearby cells to a given node, and the given node selects one or more candidate source cells or source cells of the cell from the received information of the nearby cells. Reference may be made to the foregoing description for specific selection principles.

Preferably, the method further comprises: and the given node sets the positions of radio frames and/or subframes used for air interface synchronization of the same layer of source cells to be the same.

The invention further provides a method for determining the candidate source cell or the source cell by the negotiation method, which comprises the following steps:

the local cell (target cell) realizes the interaction with the adjacent cell through an air interface signaling interaction mode, or an X2 interface interaction mode, or an S1 interface interaction mode of a core network, and selects a candidate source cell or a source cell of the local cell from the interaction.

Specifically, the local cell determines, by receiving reference signals of air interface synchronization of multiple neighboring cells, a neighboring cell that meets the requirement as a candidate source cell or a source cell of the local cell according to a set threshold. Optionally, the cell may send the candidate source cell information or the source cell information determined by the cell to the corresponding source cell. The cell sends information to the candidate source cell, and the information can be sent in a dedicated RRC message mode. So that the source cell knows that it is determined to be a candidate source cell or a source cell of the local cell. Or,

specifically, the local cell determines whether the neighboring cell can be used as a candidate source cell or a source cell by receiving reference signals of air interface synchronization of a plurality of neighboring cells, so as to determine its own candidate source cell or source cell. The local cell sends the candidate source cell information or the source cell information of the local cell to the corresponding source cell through an X2 interface, so that the source cell knows that the source cell is determined as the candidate source cell or the source cell of the local cell. Or,

specifically, the local cell determines whether the neighboring cell can be used as a candidate source cell or a source cell by receiving reference signals of air interface synchronization of a plurality of neighboring cells, so as to determine its own candidate source cell or source cell. The local cell can send the candidate source cell information or the source cell information of the local cell to a core network (for example, a mobile management device (MME)) through an S1 interface, and then the MME sends the candidate source cell information or the source cell information to a corresponding source cell through an S1 interface, so that the source cell knows that the source cell is determined as the candidate source cell or the source cell of the local cell.

Thus, when the source cell is off, it needs to consider the specific state of its own off, for example, after the source cell is off, whether it needs to wake up at the subframe position heard by the cell and send the reference signal with synchronized air interface at the subframe. When it is assumed that the source cell is turned off, the cell cannot determine a source cell suitable for itself again, and then the source cell still needs to wake up at the subframe position listened by the cell and send a reference signal with a synchronized air interface at the subframe after the source cell is turned off.

The operation of the candidate source cell for handling the own cell in the present invention can be equivalently applied to the operation of the source cell of the own cell. For example, the manner of transmitting the candidate source cell information is also applicable to transmitting the source cell information. When the candidate source cell determined by the cell has only one cell, the method is equivalent to the determination of the source cell by the cell.

a relevant cell receives the number of layers of cell division configured by an OAM mode and information of a listening subframe position configured by each layer of cell for air interface synchronization; or, the relevant cell receives the information of the divided layer number and the subframe position of the listening for the air interface synchronization configured in each layer of cell; or, the relevant cell receives cell information corresponding to the source cell configured with the air interface synchronization for listening; or, the relevant cell receives cell information corresponding to the source cell configured for listening to the air interface synchronization in the OAM manner.

Wherein the relevant cell comprises: small cells belonging to the same macro cell, and the macro cell.

Preferably, the receiving, by the relevant cell, cell information corresponding to the source cell configured for listening to the air interface synchronization includes:

and the related cell receives the cell information through an X2 interface of a backhaul link, or the related cell receives the cell information sent by a core network through an S1 interface.

Preferably, after the relevant cell receives the information of the number of layers divided by the cell and the position of the listening subframe configured for air interface synchronization in each layer of cell, the method further includes:

and the related cell determines the layer number of the related cell and determines the position of the configured listening sub-frame according to the determined layer number.

Wherein, the relevant cell determines the number of layers thereof, including:

and determining the source cell belonging to the self through detection, and acquiring the layer number of the source cell, thereby determining the layer number of the self as the layer number of the source cell plus 1.

Preferably, when the relevant cell is a source cell, the method further includes:

and the relevant cell determines the position of the configured listening sub-frame according to the number of layers determined by the relevant cell.

Preferably, the method further comprises:

the related cell transmits the listening signal in the listening sub-frame configured by itself.

Preferably, the method further comprises:

the related cell keeps subframe silence in other listening subframes except subframes needing to be listened by the related cell; or,

and the related cell keeps the resource RE multicasting corresponding to the listened signals in other listened sub-frames except the sub-frame which the related cell needs to listen to.

For the sub-frame or RE multicasting, the density of the small cells should be referred to in the specific implementation, and in general, when the density is high, since the number of the small cells is large and the interference between the small cells is serious, the multicasting mechanism should be executed. If the small cells are sparse, the interference between the general small cells is relatively small, and the muting mechanism is considered to have resource waste or performance reduction, so the muting can not be implemented. The specific density threshold may be obtained by testing or simulation.

Preferably, the method further comprises:

and the related cell respectively executes listening operation according to the configured listening subframe position of each layer, and selects a source cell suitable for the related cell by trying.

Preferably, after the relevant cell receives the cell information corresponding to the air interface synchronization source cell for listening, the method further includes: and the related cell detects the source cell of the related cell by using the cell information.

Preferably, the method further comprises: the relevant cell reports the selected source cell information, and the source cell information includes: a cell physical ID.

Preferably, the method further comprises: and the related cell reports the detected information of the candidate source cell.

Preferably, the method further comprises: the principle of selecting the source cell by the related cell is as follows: and preferentially selecting the small cells in the same cluster as the source cells from a plurality of source cells meeting the source cell measurement threshold.

the method comprises the steps that the local cell receives air interface synchronous reference signals of a plurality of cells, a source cell or a candidate source cell suitable for the local cell is determined from the air interface synchronous reference signals, and the determined source cell information or candidate source cell information is notified to the source cell or a given node.

Preferably, the method for notifying the source cell or the given node of the determined source cell information or the candidate source cell information includes:

the local cell informs a source cell or a given node through a special RRC message; or,

the cell informs the source cell or the given node through an X2 interface; or,

the cell informs the core network through an S1 interface, and then the core network informs the source cell or the given node through an S1 interface.

a source cell receives source cell information or candidate source cell information notified by the cell;

Preferably, after the source cell receives the source cell information or the candidate source cell information notified by the cell, the method further includes:

the source cell learns that the source cell is used as a source cell or a candidate source cell of other cells except the source cell, and the source cell wakes up at a subframe position of a receiving source cell of the source cell after executing shutdown, and sends an air interface synchronization reference signal at the subframe position.

The method of the present invention is further described in detail below with reference to the accompanying drawings and specific examples.

In the embodiment of the present invention, when performing synchronization between a small cell and a macro cell and between small cells in an listening manner, a network side should uniformly configure listening subframe positions used by the macro cell and small cells subordinate to the macro cell through a designated node, and establish a corresponding relationship between the number of layers and the subframe positions, for example: the positions of the subframes for listening in each layer are kept the same, so that the macro cell and the small cell can determine the number of layers when the cell (or the small cell) is used as a source cell according to the positions of the subframes for listening, and the number of layers is implicitly notified by the appointed subframe positions for configuring listening.

The so-called listening air interface synchronization mode and source cell definition are as follows: cell1 receives the reference signal transmitted by cell2 to estimate the timing time difference between cell1 and cell2 and to adjust the timing of cell1 to stay the same as cell2 (i.e., cell1 keeps itself synchronized with cell 2). The cell2 is referred to as a source cell of the cell1, and there is no strict requirement that the cell2 knows whether the cell1 keeps synchronization with itself in a listening manner. Cell1 is the own cell described in step 101 (a) and step 101 (b), and is also referred to as the target cell.

In addition, the configuration of the subframe position used for listening in each corresponding layer can also be performed in an operation, administration and maintenance (OAM) mode of an operator background, and the information is notified to the macro cell and the small cell subordinate to the macro cell, so that the macro and small cells can know which subframes are required to be configured in each layer for listening in other cells. In this way, after learning the layer number of the macro cell or the small cell, it is kept that reference signals for listening are sent in the subframe for listening corresponding to the cell, for example: the source cell itself cannot configure the subframe for listening as an MBSFN subframe.

For example, a given node or OAM mode is specified, where a source cell of a first layer configures a subframe for listening to be subframe N (refer to one of subframes 0 to 9, e.g., subframe 0) and gives a period of M (e.g., 10 s), a source cell of a second layer configures a subframe for listening to be subframe K (refer to one of subframes 0 to 9 and different subframe N, e.g., subframe 1) and has a period of P (which may be the same as M), a source cell of a third layer configures a subframe for listening to be subframe H (refer to one of subframes 0 to 9 and different subframe M, N, e.g., subframe 2) and has a period of Q (which may be the same as M, P), and so on, when the number of layers exceeds 10, each layer is further limited to corresponding subframes by means of radio frame number + subframe, for example: the subframes configured for listening by the source cell of the first layer are: the radio frame number is 0, and the subframe number is 0; the subframes configured for listening by the source cell of the second layer are: the radio frame number is 1, and the subframe number is 1; and in turn, the subframe configured for listening by each layer of source cell is described by using the radio frame number and the subframe number simultaneously.

And configuring the subframe position used for listening by the source cell of each layer in a given node or OAM mode designated by the network side, and sending the subframe position information to the related macro cell and small cell. Preferably, if the small cell is not allowed to listen to other (adjacent) macro cells and the small cells thereof to realize synchronization, the related small cells are under the same macro cell, otherwise, the small cells comprise the small cells adjacent to the macro cell and the adjacent macro cells.

The network side as described above specifies a given node, preferably a macro cell. Thus, a macro cell needs to notify a subordinate small cell of the configured layer number and a corresponding listening subframe position, and also can notify an adjacent macro cell of the configured subframe position for listening of each layer of the small cell or the adjacent macro cell, so that each small cell and macro cell can know all the subframe positions for listening configured in each layer. The notification is specifically as follows:

mode 1, broadcast system messages using macro cells.

By using the method, the small cell is required to acquire the broadcast system message of the macro cell when initially configuring or initially accessing the macro cell; or,

mode 2, namely, when the network is deployed, the subframe position for listening configured corresponding to each layer is placed into a corresponding macro cell or small cell, and if the subframe position needs to be updated, the subframe position is reconfigured in a later stage in an OAM mode; or,

mode 3, transmission is performed through port X2.

After the small cells receive the number of layers and the subframe position of each layer of configured listening through an X2 port, each small cell tries to synchronize with a macro cell or other source cells, and a reference signal sent by a candidate source cell is received in the given subframe position of each layer of listening. If the small cell selects a proper target cell as a source cell, the small cell also needs to further determine the number of layers corresponding to the small cell; or,

in the method 4, multicast notification is adopted.

The related small cells are notified by a given node in a multicast manner, for example: and the small cell participating in the listening joins the multicast group, and the given node sends the subframe position information and the layer number for the listening in the multicast group.

The above-mentioned methods 1 to 4 are also suitable for transmitting candidate source cell (or source cell set) information, and only the number of layers and the sounding subframe location information configured for each layer need to be equivalently replaced.

The cell tries to perform air interface synchronization in the listening sub-frame configured in each layer, so as to finally determine the position of the listening sub-frame suitable for the cell, further know the number of layers of the source cell and the number of layers to which the cell belongs according to the listening sub-frame position information, keep the listening sub-frame corresponding to the number of layers to which the cell belongs not to be configured as an MBSFN sub-frame, and keep the sub-frame to be transmitted with a reference signal for air interface synchronization. For example: the small cell1 first tries the air interface synchronization according to the listening subframe position corresponding to the first layer, if the performance is not good, then it continues to try the air interface synchronization according to the listening subframe position corresponding to the second layer until a proper number of layers and a corresponding source cell are selected. Assuming that the small cell1 meets the requirement when the first layer attempts, the small cell1 determines that the number of layers corresponding to the cell which becomes the source cell should be the second layer according to the number of layers, thereby configuring itself according to the subframe position for listening configured by the second layer, and keeping the corresponding reference signal transmission in the listening subframe. After the method is adopted, potential cells in the same layer adopt the same listening subframe position for the macro cell and the subordinate small cell, so that the listening cells can perform listening in the same subframe, the number of the muted subframes is greatly reduced, and resources are saved. Although the subframe positions for listening configured for the cells of the same layer are the same, the reference signals for listening configured for the cells of the same layer are orthogonal to each other and RE muting can be performed between each other.

For Macro cells and subordinate small cells which do not need to perform listening in a certain listening subframe, the listening needs to be performed in the subframe, or the listening needs to be performed in the RE corresponding to the reference signal used for listening in the subframe.

The multicasting processes described herein each include sub-frame multicasting and RE multicasting. The subframe muting means that when the cell1 receives the reference signal of the source cell in the subframe 1, the cell2 stops transmitting data in the subframe 1. RE muting means that when cell1 receives the reference signal of the source cell in subframe 1, cell2 does not transmit data in the RE corresponding to the reference signal of the source cell in subframe 1.

The positions of the subframes configured for the null interface synchronization listening of each layer of source cell are the same, so that the Muting is easier to realize, and the resource saving is facilitated.

Furthermore, the invention also provides a layer number reporting mode, so that the macro can know which cells in the same layer are different from a method for reporting the cell physical ID of the source cell. Specifically, when a small cell selects a suitable source cell and is used for air interface synchronization, the small cell should report the number of layers to which the small cell belongs (that is, the number of layers corresponding to the small cell if the small cell is used as the source cell); or reporting the layer number of the own source cell to a given node, or reporting the layer number to a macro cell (no matter in an OAM mode or in a given node mode), so that the macro cell can preferentially consider the cells in the same layer when selecting a proper coordinated multipoint transmission (COMP) cell for the UE by using the information, because the timing difference of the cells in the same layer is very small (almost zero). Further, the information reported by the small cell may further include: the information of the source cell includes, for example, frequency point of the source cell, cell physical ID, and the like.

In another case, when a small cell selects a suitable source cell, if a plurality of cells meet the requirements of serving as the source cell at the same time, the small cell may report information of the plurality of cells to a given node or a macro cell, and the given node or the macro cell selects one source cell for the small cell according to the configuration synchronous listening situation of other small cells in the system and notifies the small cell. In this case, it is advantageous to plan the source cell in the system, for example: after the small cell on/off technology is introduced, the macro cell can select a cell with a heavy load and a smaller closing probability as a source cell of the small cell.

Furthermore, considering that there may be asynchrony between adjacent macro cells in a Frequency Division Duplex (FDD) system, if a small cell1 under macro cell1 hears a small cell2 under the neighboring cell or a small cell reference signal under macro cell2 for null synchronization, it is obvious that a small cell1 may assume synchronization with the macro cell1, but in fact, a small cell1 does not maintain synchronization with the macro cell 1.

In order to overcome the above problems, the present invention further includes that the network side configures cell information of a macro cell and a small cell for listening to, for a small cell subordinate to a macro cell in a given node or OAM manner, for example: and configuring small cells under the macro cells in a set mode. Preferably, the cells configured for the small cell1 and capable of being used for listening are a macro cell to which the small cell1 belongs and other small cells which the macro cell belongs to. The cell information of the macro cell and the small cell for listening may be sent or processed to the small cell in the same manner as the number of layers and the subframe location information for listening configured in each layer.

After receiving or acquiring the optional cell information (of the macro cell or the small cell) for listening by the small cell, the small cell can only select from the optional cells for listening configured, and cannot select other cells for air interface synchronization. Therefore, the range of the cell is searched in the listening process of the small cell.

For the cell information for listening, it is preferable to describe the frequency point of the cell and the cell physical ID. For example: and providing a plurality of groups of cell frequency points and cell physical IDs. If the time used in the listening process of the small cell is required to be shortened, the execution process of the listening process of the small cell is simplified, and further, bandwidth information can be added to each group of cell information for listening, so that the Physical Broadcast Channel (PBCH) of a source cell for listening is not required to be connected again when the small cell listens, the listening process of the small cell is simplified, and the listening time of the small cell is shortened.

Therefore, after the cell information for listening is configured, the small cell cannot detect the adjacent macro cell and the small cell subordinate to the adjacent macro cell in the listening process, so that the situation that the listened small cell selects a wrong cell object for listening is avoided, and the situation that the small cell gets into an empty synchronization error which cannot be corrected by the small cell is avoided.

Further, when a given node or OAM mode is adopted to configure cell information available for listening for a small cell, the given node or OAM mode knows in advance that neighboring macro cells are synchronized, and then the given node or OAM mode can configure the neighboring synchronized macro cells and their subordinate small cells as cells available for listening for air interface synchronization for the small cells subordinate to the macro cells.

And as a small cell, after receiving cell information which is configured for the cell by adopting a given node or OAM mode and can be used for listening, the small cell searches a cell physical ID corresponding to the cell at a frequency point configured for the cell, and after the cell physical ID is correctly searched, a reference signal of a subframe position for listening is directly received according to a given bandwidth for air interface synchronization without receiving PBCH.

The invention is described in detail below with reference to several specific examples.

Example 1

Let macro cell be the node of the given configured listening subframe position.

The Macro cell configures subframe positions for listening for the subordinate small cells and the Macro cell, and the subframe positions for listening in each layer are different, that is, the UE can acquire the layer number corresponding to the subframe pattern as long as acquiring the subframe pattern for listening; or the UE knows the number of layers of a certain small cell, and can know the subframe pattern configured in the small cell for listening. The configuration information can be notified to a small cell, and the notification method specifically comprises the following steps: system broadcast information notification, or X2 notification; of course, the notification may also be performed in an OAM manner, that is, when a small cell is deployed, the information is configured into the small cell. The positions of the subframes for listening in each layer are directly distinguished through the subframes, or are simultaneously distinguished through the radio frames and the subframes.

In this embodiment, the maximum number of layers is 4, which are respectively referred to as the first, second, third, and fourth layers (or 0 th, 1 th, 2 th, and 3 rd layers). The Macro cell is configured as a first layer, for example, a subframe is configured as #0, and the period is 10 s. The Macro cell serves as a first layer node, and reference signals (e.g., CRS) for air interface synchronization are kept to be transmitted in corresponding subframes according to listening subframe positions configured in the first layer, that is, the Macro cell cannot configure subframes used for listening to itself as MBSFN subframes. The second layer configures the subframe position for listening to be #1 with a period of 10 s. The subframe position configured for listening in the third layer is #2, and the period is 10 s. The fourth layer is configured for listening with subframe position #3 and period of 10 s.

For a plurality of small cells under the macro cell, a reference signal for air interface synchronization may be received from a position of a listening subframe corresponding to a first layer of the macro cell, and synchronization with a first layer of a source cell may be attempted. If the synchronization is successful, the small cell determines that the source cell of the small cell is a macro cell, further determines that the small cell belongs to a second-layer synchronization source (the small cell is a second-layer source cell because the small cell is the synchronization acquired from the first-layer source cell), and sends a reference signal for air interface synchronization according to a subframe position configured by the second layer and used for listening, and does not configure the corresponding subframe as an MBSFN subframe; if the synchronization fails, the small cell continuously tries to receive the reference signal for the air interface synchronization according to the subframe position for listening configured by the second layer, tries to synchronize with the source cell of the second layer, if the synchronization succeeds, determines that the source cell of the small cell is the source cell of the second layer and belongs to the source cell of the third layer, and sends the reference signal for the air interface synchronization at the subframe position according to the subframe position for listening configured by the third layer. The rest is analogized in turn, and is not detailed here.

Further, for a small cell, the signaling needs to be kept at the position of the subframe heard by other small cells, or the signaling needs to be kept at the position of the RE in the subframe heard by other small cells (silent, no signaling). Here, the subframe positions listened by other small cells include all subframe positions for listening in the first, second, third and fourth layers (except the subframe position that the small cell is listening, the subframe that the small cell actually listens to by itself does not send data, which is equivalent to muting). For example: the small cell1 is synchronized with one small cell in the second layer, so that the small cell1 should keep the listening sub-frame position in other layers (e.g., the third and fourth layers) in addition to the receiving data (equivalent to the listening) in the sub-frame position used by the second layer small cell for listening, and optionally also keep the listening sub-frame position in the first layer (the sub-frame position configured for listening in the macro cell). For macro cells, small cell1 may also mute the REs that send synchronization reference signals in the listening sub-frame position or sub-frame.

When the subframe position information for listening changes, the macro cell needs to send the updated subframe position for listening of each layer to the subordinate small cell, or reconfigure the subframe position for listening to the subordinate small cell in an OAM manner.

Example 2

And the Macro cell configures cell information available for listening for the subordinate small cell and sends the configured cell information available for listening to the subordinate small cell. The cell information which can be used for listening by the small cell can be configured for each small cell in an OAM mode; then, the small cell executes the air interface synchronization of listening according to the cell information which can be used for listening. By adopting the method, the range of the detected source cell is narrowed when the small cell executes listening, the processes of blind detection, receiving and the like in the detection are reduced, the listening execution is accelerated, and the phenomenon that the reference signal of the adjacent macro cell or the small cell subordinate to the adjacent macro cell is overheard by mistake when the small cell carries out air interface synchronization is avoided.

Here, each cell information for listening is composed of a cell frequency point, a cell physical ID, and bandwidth information. If all the small cells deployed in the future belong to the same frequency layer, the cell frequency point information can be shared information and only needs to be sent once.

Example 3

When the cell is deployed, the related technical personnel can determine the information of the nearby cell according to the deployed geographic position of the cell. If the nearby cell and the local cell belong to the same macro cell, the cells and the macro cell are directly configured in an OAM manner to serve as the candidate source cell information of the local cell, and generally, small cells under the same macro cell are considered to be synchronous, and synchronous sources are both a local macro cell and the small cell under the macro. If the nearby cell has a situation that the nearby cell does not belong to the same macro cell as the local cell, further confirming whether cells belonging to other macro cells in the nearby cell are synchronous with the macro cell to which the local cell belongs, and if so, configuring the nearby cell as a candidate source cell of the local cell; otherwise, only the cell belonging to the same macro cell as the local cell in the nearby cells and the macro are configured as candidate source cells of the local cell.

Example 4

In this embodiment, on the basis of embodiment 3, only the candidate source cell configured in the local cell in the OAM manner is modified to send the information of the candidate source cell through the given node, where the specific sending manner may be an air interface manner, a broadcast system message manner, or an X2 port of backhaul, and the given node sends the information of the candidate source cell to the local cell through the core network and through the S1 interface. The selection principle of the source cell is unchanged.

Example 5

If the cell is out of the coverage of the macro cell and cannot receive an air interface signal of the macro cell, selecting a candidate source cell from a nearby cell (which is a small cell) or a small cell in the same cluster for the cell. For nearby cells, if there is a different cell in the nearby cells that does not belong to the same cluster as the local cell, it needs to be further confirmed whether the different cell is synchronized with the small cell in the cluster, if so, the different cell may be used as a candidate source cell of the local cell, otherwise, the different cell cannot be used.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, and as shown in fig. 2, the node 20 includes: a configuration module 201 and a sending module 202; wherein,

the configuration module 201 is configured to determine the number of layers of cell division, and configure a subframe position for listening to air interface synchronization for each determined layer of cell; or, the method is used for determining a source cell with a synchronous air interface which can be used for listening in the cell, configuring cell information corresponding to the source cell, and configuring the cell information as the cell;

the sending module 202 is configured to send or configure the number of layers and the information of the listening subframe position configured for each layer of cell; or, the cell information is used for sending the cell information to the local cell.

Preferably, when the local cell is a small cell, the configuration module is further configured to determine, when it is determined that the neighboring macro cell and the node keep synchronous, the neighboring macro cell and its small cell as a candidate source cell or a source cell for air interface synchronization used by the local cell.

Preferably, the configuring module 201 is further configured to select one or more cells from the received information of the potential source cells as candidate source cells or source cells of the cell; or, the method is used for selecting a cell from the candidate source cells as the source cell of the cell.

Preferably, the configuration module 201 is further configured to set the same radio frame and/or subframe position of the same layer of source cell for air interface synchronization listening.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, and as shown in fig. 3, the node 30 includes: a receiving module 301, configured to receive information about the number of layers divided by cells configured in an OAM manner and the subframe position of each layer of cells configured for air interface synchronization;

Preferably, after receiving information of the number of layers divided by the cell and the position of the listening subframe configured for air interface synchronization in each layer of cell, the receiving module 301 is further configured to determine the number of layers of the node, and determine the position of the listening subframe configured for the node according to the determined number of layers.

Preferably, when the node is a source cell, the receiving module 301 is further configured to determine the listening subframe position configured by the node according to the determined number of layers.

Preferably, the node further comprises: a sending module 302, configured to send a listening signal in the listening subframe determined by the receiving module and in which the node is configured. .

Preferably, the node further includes a processing module 303, configured to keep subframe muting in subframes other than subframes that the node needs to listen to; or,

and keeping the resource resetting corresponding to the heard signal in other heard subframes except the subframes which the node needs to hear.

Preferably, the processing module 303 is further configured to perform listening operation according to the configured listening subframe position of each layer, and select a source cell suitable for the node by trying.

Preferably, after the receiving module 301 receives the cell information corresponding to the source cell of the air interface synchronization for listening, the processing module 303 is further configured to detect the source cell of the node by using the cell information.

Preferably, the processing module 303 is further configured to report the selected source cell information, where the source cell information includes: a cell physical ID.

Preferably, the processing module 303 is further configured to report information of the detected candidate source cell.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, and as shown in fig. 4, the node 40 includes: a receiving module 401 and a notification module 402; wherein,

the receiving module 401 is configured to receive air interface synchronization reference signals of multiple cells, and determine a source cell or a candidate source cell suitable for the cell;

the notifying module 402 is configured to notify the source cell or the candidate source cell determined by the receiving module 401 to a source cell or a given node.

Preferably, the notifying module 402 notifies the source cell or the given node of the source cell information or the candidate source cell information, including:

the notification module 402 notifies the source cell or the given node through a dedicated RRC message; or,

the notification module 402 notifies the source cell or the given node through an X2 interface; or,

the notification module 402 notifies the core network through an S1 interface and then is notified to the source cell or the given node by the core network through an S1 interface.

An embodiment of the present invention further provides a node for implementing air interface synchronization configuration, and as shown in fig. 5, the node 50 includes: a receiving module 501, configured to receive source cell information or candidate source cell information notified by a local cell;

Preferably, the node further comprises: running the sending module 502; after the receiving module 501 receives the source cell information or candidate source cell information notified by the own cell,

the operation sending module 502 is configured to learn that the source cell is a source cell or a candidate source cell of another cell except for the source cell, wake up at a subframe position where the cell receives an air interface synchronization reference signal of the source cell after performing shutdown, and send the air interface synchronization reference signal at the subframe position.

Therefore, the embodiment of the invention adopts the unified node to configure the position and the layer number of the sub-frame for listening, thereby being beneficial to the implementation of the sub-frame multicasting or RE multicasting scheme, greatly reducing the resource needing multicasting and avoiding the signaling interaction. Otherwise, the subframe position information for listening needs to be interacted among the small cells, so that other small cells configure subframe positions for listening in the small cells.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

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

Claims

1. A configuration method for realizing air interface synchronization is characterized in that the method comprises the following steps:

the method comprises the steps that a given node determines the number of layers of cell division, configures listening subframe positions for air interface synchronization for each layer of cell, and sends or configures the number of layers and the listening subframe position configured for each layer of cell to a cell, the given node receives potential source cell information reported by the cell, determines a source cell for air interface synchronization which can be used for listening by the cell from the potential source cell information, configures cell information corresponding to the source cell, and sends the cell information to the cell.

2. The method of claim 1, wherein the given node is a macro cell or a designated small cell.

3. The method of claim 1, wherein the sending the cell information to the cell comprises:

and the given node sends the cell information to the cell through an X2 port of the backhaul link, or the given node sends the cell information to a core network, and the core network sends the cell information to the cell through an S1 interface.

4. The method according to claim 1, wherein the cell information corresponding to the source cell of the air interface synchronization available for listening comprises: frequency point information of the cell and a cell physical ID; or,

the method comprises the following steps: information of a cell cluster where a source cell is located; or,

the method comprises the following steps: frequency point information of the cell, cell physical ID and timing difference information.

5. The method according to claim 2, wherein when the local cell is a small cell, the configured source cell includes: and small cells and the macro cells which belong to the same macro cell with the local cell.

6. The method according to claim 2 or 5, wherein when the local cell is a small cell, the method further comprises:

when the given node determines that the adjacent macro cell keeps synchronous with the given node, the adjacent macro cell and the small cell are determined as a candidate source cell or a source cell of air interface synchronization used for listening by the cell.

7. The method of claim 1, further comprising:

the given node selects one or more cells from the received information of the potential source cells as candidate source cells or source cells of the cell; or, the given node designates a cell as a source cell of the cell; or, the local cell selects one cell from the candidate source cells as the source cell of the local cell.

8. The method of claim 1, further comprising:

and the given node sets the positions of radio frames and/or subframes used for air interface synchronization of the same layer of source cells to be the same.

9. A configuration method for realizing air interface synchronization is characterized in that the method comprises the following steps:

the method comprises the steps that a relevant cell receives the number of layers of cell division configured by a given node and information of a listening subframe position configured by each layer of cell and used for air interface synchronization, the relevant cell reports potential source cell information to the given node, the relevant cell receives cell information corresponding to a source cell configured by the given node and used for listening air interface synchronization, and the source cell used for listening air interface synchronization is determined from the potential source cell information.

10. The method of claim 9, wherein the related cell comprises: small cells belonging to the same macro cell, and the macro cell.

11. The method according to claim 9, wherein the receiving, by the relevant cell, cell information corresponding to a source cell configured by the given node for listening air interface synchronization includes:

12. The method of claim 9, wherein after the relevant cell receives information of the number of layers of cell division configured by the given node and the subframe position of the listening for air interface synchronization configured by each layer of cell, the method further comprises:

13. The method of claim 12, wherein the related cell determines its own number of layers, comprising:

14. The method of claim 12, wherein when the related cell is a source cell, the method further comprises:

15. The method of claim 14, further comprising:

16. The method according to any one of claims 9-15, further comprising:

17. The method according to any one of claims 9-15, further comprising:

18. The method according to any of claims 9-15, wherein when the relevant cell receives the cell information corresponding to the source cell for air interface synchronization for listening, the method further comprises:

and the related cell detects the source cell of the related cell by using the cell information.

19. The method of claim 18, further comprising:

the relevant cell reports the selected source cell information, and the source cell information includes: a cell physical ID.

20. The method of claim 18, further comprising:

and the related cell reports the detected information of the candidate source cell.

21. A node for implementing air interface synchronization configuration, the node comprising: a configuration module and a sending module;

the configuration module is configured to determine the number of layers of cell division, and configure a subframe position for listening to air interface synchronization for each determined layer of cell;

the system comprises a cell, a network node and a cell management node, wherein the cell is used for receiving potential source cell information reported by the cell, determining a source cell with air interface synchronization which can be used for listening in the cell from the potential source cell information, and configuring cell information corresponding to the source cell;

the sending module is configured to send or configure the number of layers and the information of the listening subframe position configured for each layer of cell;

and the cell information is used for sending the cell information to the cell.

22. The node according to claim 21, wherein when the local cell is a small cell, the configuration module is further configured to determine, when it is determined that a neighboring macro cell and the node keep synchronization, the neighboring macro cell and its small cell as a source cell or a source cell that is a candidate for air interface synchronization used by the local cell for listening.

23. The node of claim 21, wherein the configuring module is further configured to select one or more cells from the received information of the potential source cells as candidate source cells or source cells of the local cell; or, the method is used for selecting a cell from the candidate source cells as the source cell of the cell.

24. The node according to claim 21, wherein the configuration module is further configured to set the same radio frame and/or subframe location for listening to air interface synchronization in the same layer of source cells.

25. A node for implementing air interface synchronization configuration, the node comprising: a receiving module, configured to receive the number of layers of cell partition configured by a given node and information of a listening subframe position configured by each layer of cell for air interface synchronization, report potential source cell information to the given node, and receive cell information corresponding to a source cell configured by the given node for listening air interface synchronization, where the source cell for listening air interface synchronization is determined from the potential source cell information.

26. The node according to claim 25, wherein after receiving information of the number of layers that a given node configures cell division and the position of the listening sub-frame configured for air interface synchronization in each layer of cell, the receiving module is further configured to determine the number of layers of the node, and determine the position of the listening sub-frame configured for the node according to the determined number of layers.

27. The node of claim 26, wherein the receiving module is further configured to determine the listening subframe locations at which the node is configured according to the determined number of layers when the node is a source cell.

28. The node according to claim 27, wherein said node further comprises: a sending module, configured to send the listening signal in the listening subframe configured by the node determined by the receiving module.

29. The node according to any of claims 25-28, wherein the node further comprises a processing module for keeping subframe muting in subframes other than subframes that the node needs to listen to; or,

30. The node of claim 29, wherein the processing module is further configured to perform listening operation according to the configured listening subframe position of each layer, and select a source cell suitable for the node by trying.

31. The node according to claim 29, wherein after receiving the cell information corresponding to the source cell for air interface synchronization for listening,

the processing module is further configured to detect a source cell of the node using the cell information.

32. The node of claim 31, wherein the processing module is further configured to report the selected source cell information, and wherein the source cell information comprises: a cell physical ID.

33. The node of claim 31, wherein the processing module is further configured to report information of the detected candidate source cells.

34. A system for implementing air interface synchronous configuration, the system comprising: the node of any one of claims 21-24 and the node of any one of claims 25-33.

35. A configuration method for realizing air interface synchronization is characterized in that the method comprises the following steps: the method comprises the steps that the local cell receives air interface synchronous reference signals of a plurality of cells, a source cell or a candidate source cell suitable for the local cell is determined from the air interface synchronous reference signals, and the determined source cell information or candidate source cell information is notified to the source cell or a given node;

the given node determines the number of division layers of a cell, configures a listening subframe position for air interface synchronization for each layer of the determined cell, and sends or configures the number of layers and information of the listening subframe position configured for each layer of the cell; and if the information reported by the cell to the given node is the candidate source cell information, the cell receives the source cell information determined by the given node for the cell.

36. The method of claim 35, wherein the method for notifying a source cell or a given node of the determined source cell information or candidate source cell information comprises:

the cell informs the source cell or the given node through an X2 interface; or,

37. A configuration method for realizing air interface synchronization is characterized in that the method comprises the following steps: a source cell receives source cell information or candidate source cell information notified by the cell;

the source cell information or the candidate source cell information is determined by the cell from the air interface synchronous reference signals of a plurality of cells, and is suitable for the source cell or the candidate source cell of the cell,

if the information received by the source cell is candidate source cell information, the local cell reports the candidate source cell information to a given node, the local cell receives source cell information determined by the given node for the local cell, and the given node configures the selected source cell as a source cell of the local cell;

the given node determines the number of division layers of the cell, configures the listening subframe position for air interface synchronization for each layer of the determined cell, and sends or configures the number of layers and the listening subframe position configured for each layer of the cell.

38. The method of claim 37, wherein after the source cell receives the source cell information or candidate source cell information notified by the local cell, the method further comprises:

39. A node for implementing air interface synchronous configuration is characterized in that the node comprises: the device comprises a receiving module and a notification module; wherein,

the notifying module is configured to notify the source cell or the candidate source cell determined by the receiving module to a source cell or a given node;

if the information reported by the cell to the given node is candidate source cell information, the cell receives the source cell information determined by the given node for the cell;

the receiving module is further configured to determine the number of division layers of the cell through the given node, configure a listening subframe position for air interface synchronization for each determined layer of cell, and send or configure the number of layers and information of the listening subframe position configured for each layer of cell.

40. The node of claim 39, wherein the notifying module notifies a source cell or a given node of source cell information or candidate source cell information, comprising:

the notification module notifies a source cell or a given node through a dedicated RRC message; or,

the notification module notifies the source cell or the given node through an X2 interface; or,

the notification module notifies the core network through an S1 interface and then is notified to the source cell or the given node by the core network through an S1 interface.

41. A node for implementing air interface synchronous configuration is characterized in that the node comprises: a receiving module, configured to receive source cell information or candidate source cell information notified by a local cell;

42. The node according to claim 41, wherein the node further comprises: operating a sending module; after the receiving module receives the source cell information or candidate source cell information notified by the local cell,

and the operation sending module is configured to learn that the source cell is a source cell or a candidate source cell of another cell except the source cell, wake up at a subframe position where the cell receives an air interface synchronization reference signal of the source cell after the execution is turned off, and send the air interface synchronization reference signal at the subframe position.