WO2015106445A1

WO2015106445A1 - Interaction method for synchronization between cells, apparatus and communication system

Info

Publication number: WO2015106445A1
Application number: PCT/CN2014/070828
Authority: WO
Inventors: 王轶; 张磊; 汪巍崴
Original assignee: 富士通株式会社; 王轶; 张磊; 汪巍崴
Priority date: 2014-01-17
Filing date: 2014-01-17
Publication date: 2015-07-23
Also published as: CN105519026B; CN105519026A

Abstract

Embodiments of the present invention provide an interaction method for synchronization between cells, an apparatus and a communication system, wherein the method comprises: sending link quality information between a first base station in a synchronization state and a device that provides a synchronization reference for the first base station to a second base station, enabling the second base station to select the device that provides the synchronization reference based on the link quality information. According to the embodiments of the present invention, a better device used for providing a synchronization reference can be selected based on the link quality information, thus improving performance of an entire synchronization link.

Description

Interval method, device and communication system for small interval synchronization

The present invention relates to the field of communications, and in particular, to an inter-cell synchronization interaction method, apparatus, and communication system. Background technique

Currently, synchronization between different cells can be achieved by Global Position System (GPS) / Global Navigation Satellite System (GNSS), or by sending a dedicated synchronization protocol on the loop.

However, in some scenarios, such as when the cell is indoors, GPS signals may not be received, so GPS/GNSS synchronization cannot be used. For another example, when the loop of the cell is not ideal, synchronization may not be achieved by the synchronization protocol transmitted on the loop.

In the study of heterogeneous networks of Long Term Evolution (LTE) systems, a mechanism based on inter-cell synchronization over the air interface is introduced. A cell base station that provides a clock synchronization reference for other base stations may be referred to as a donor base station (also referred to as a donor cell), and a cell base station that receives a signal of a donor base station to obtain synchronization may be referred to as a slave base station (also Called slave cell). The base station may be an eNB, or may be another base station, such as a base station of a micro cell.

In the existing mechanism, the slave base station can monitor the signal of the donor base station at certain moments, for example, in the multimedia broadcast single frequency network (MBSFN) subframe of the slave base station, and listen to the common reference signal of the donor base station. (CRS, Common Reference Signal), to obtain time and frequency synchronization information.

1 is a schematic diagram of inter-cell synchronization based on air interface in the prior art. As shown in Figure 1, there may be multiple hops throughout the synchronization link. The Master eNB 1 (MeNB1) can obtain the synchronization directly through the GPS (for example, obtain the reference time), and the synchronization level information of the Master eNB1 can be defined as the stratum level =0; the cell 1 uses the Master eNB1 as the donor base station to obtain the synchronization, and the synchronization level of the celll. The information can be defined as stratum level=l; cell2 uses celll as the donor base station to obtain synchronization, cell 2 synchronization level information can be defined as stratum level=2 _; celB uses cell2 as the donor base station to obtain synchronization, and celB synchronization level information can be defined. For stratum level=3.

Similarly, the Master eNB 2 (MeNB2) can acquire synchronization directly through the GPS, and the Master eNB 2 can be used. The synchronization level information is defined as stratum level =0; cell4 uses Master eNB2 as the donor base station to obtain synchronization, cell4 synchronization level information can be defined as stratum level=l _; cell5 uses celW as the donor base station to obtain synchronization, and cell 5 synchronization level Information can be defined as stratum level = 2.

When a base station of a certain cell needs to establish synchronization, it is required to detect a signal used by the surrounding cells to implement cell synchronization, and a base station of one cell may be selected and stratum level information is requested from the base station. For example, when the base station of cell2 needs to establish synchronization, celll can be found, and the base station of celll is requested to obtain the stratum level information of cell1; the base station of celll can send its stratum level information to the base station of cell2. If cell5 of cell2 can also discover cell5, it can request the stratum level information of cell5 from the base station of cell5.

Moreover, the cell base station that needs to establish synchronization selects the cell base station with the lowest stratum level as its donor base station. For example, the base station of cell2 selects the base station of celll as the donor base station because cellatum has a stratum level of 1, and cell5 has a stratum level of 2. By selecting the cell base station with the lowest stratum level, the cumulative error can be reduced to some extent.

It should be noted that the above description of the technical background is only for the purpose of facilitating the clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these solutions are set forth in the background section of the present invention. Summary of the invention

However, the inventors have found that there is no further provision in the current standard for how to select a cell site that provides a synchronization reference. For example, when the stratum level of the discovered cell base station is the same, how to establish a dorm base station for the cell base station to be synchronized is not provided by the existing standard.

On the other hand, the scene of small cells in heterogeneous networks has received more and more attention. In the small cell scenario, synchronization of cells can bring greater benefits to the system. If the accuracy of inter-cell synchronization can be further improved, it will be more beneficial to the new small cell scene.

Embodiments of the present invention provide an interaction method, device, and communication system for inter-cell synchronization. By adding a new link quality information that reflects the potential donor base station, it can help the slave base station to select a better donor base station.

According to an aspect of the embodiments of the present invention, an inter-cell synchronization interaction method is provided, the method comprising: connecting a first base station in a synchronization state with a link quality between a device providing a synchronization reference for the first base station Sending information to the second base station, so that the second base station selects and provides synchronization parameters according to the link quality information Test equipment.

According to another aspect of the embodiments of the present invention, an inter-cell synchronization interaction apparatus is provided, where the interaction apparatus includes:

The information sending unit sends the link quality information between the first base station in the synchronization state and the device that provides the synchronization reference to the first base station to the second base station, so that the second base station is configured according to the link quality information. Select the device that provides the synchronization reference.

According to another aspect of the embodiments of the present invention, a communication system is provided, including:

The first base station sends, to the second base station, link quality information between the first base station and a device that provides a synchronization reference for the first base station;

The second base station selects, according to the link quality information, a device that provides a synchronization reference.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a base station, the program causes a computer to perform an inter-cell synchronization interaction method as described above in the base station .

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an inter-cell synchronization interaction method as described above in a base station.

The beneficial effects of the embodiments of the present invention are to provide assistance for the slave base station to select a better donor base station by adding a new link quality information that reflects the potential donor base station. The slave base station can select a better donor base station based on the obtained link quality information of the potential donor base station, thereby improving the performance of the entire synchronization link.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, which illustrate the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. In order to facilitate the illustration and description of some parts of the invention, the corresponding parts in the drawings may be enlarged or reduced.

The elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the

1 is a schematic diagram of inter-cell synchronization based on an air interface in the prior art;

2 is a flowchart of an interaction method of inter-cell synchronization according to Embodiment 1 of the present invention;

3 is another flowchart of an interaction method of inter-cell synchronization according to Embodiment 1 of the present invention;

4 is a diagram showing an example of an interaction method of inter-cell synchronization according to Embodiment 1 of the present invention;

5 is another example diagram of an interaction method of inter-cell synchronization according to Embodiment 1 of the present invention;

6 is a flowchart of an interaction method of inter-cell synchronization according to Embodiment 2 of the present invention;

7 is a schematic structural diagram of an inter-cell synchronization interaction apparatus according to Embodiment 3 of the present invention;

8 is a schematic structural diagram of a base station according to Embodiment 3 of the present invention;

9 is a schematic diagram showing the structure of an inter-cell synchronization interaction apparatus according to Embodiment 4 of the present invention;

Figure 10 is a block diagram showing the configuration of a communication system according to a fifth embodiment of the present invention.

detailed description

The foregoing and other features of the invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiments of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims.

Example 1

The embodiment of the present invention provides an interaction method for inter-cell synchronization, which is described from the device in the synchronization state (ie, the donor base station). 2 is a flowchart of an interaction method of inter-cell synchronization according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

Step 201: Send link quality information between the first base station in the synchronization state and the device that provides the synchronization reference for the first base station to the second base station, so that the second base station selects to provide synchronization according to the link quality information. Reference device.

In this embodiment, the first base station may be a base station that is already in a synchronized state, and the second base station may be a base station that is in an unsynchronized state. The base station in the embodiment of the present invention may be a base station of a macro cell, a base station of a pico cell, or a base station of a femto cell. However, the present invention is not limited thereto, and may be, for example, a remote radio head (RRH) or the like. In this embodiment, the device that provides the synchronization reference for the first base station may be a base station that has already been synchronized, and may also be GPS or the like. In addition, the device providing the synchronization reference may have one or more levels. For example, as shown in FIG. 1, the device that provides the synchronization reference for the first base station (for example, the base station of cell1 in FIG. 1) is MeNB1, and the device that provides the synchronization reference for MeNB1 is GPS. Regarding the first base station, the second base station, and the device that provides the synchronization reference for the first base station, a specific device can be determined according to actual conditions. Hereinafter, only a cell base station (e.g., an eNB) will be described as an example.

In this embodiment, the link quality information may include: Signal to Interference plus Noise Ratio (SINR) information, Reference Signal Received Power (RSRP) information, or reference signal reception quality (RSRQ, Reference Signal Received Quality) Information; however, the invention is not limited thereto.

Thereby, the second base station in the unsynchronized state can obtain the link quality information of the first base station (ie, the potential donor base station), and in the case of obtaining the link quality information of the plurality of potential donor base stations, for example, the second base station, for example The synchronization device with the best link quality can be selected to provide assistance for the second base station to select a better donor base station. As for how to synchronize after selecting the donor base station, reference may be made to the prior art, and details are not described herein again.

FIG. 3 is another flowchart of an inter-cell synchronization interaction method according to an embodiment of the present invention. As shown in FIG. 3, the method includes:

Step 301: Obtain link quality information between the first base station and a device that provides a synchronization reference for the first base station. Step 302: Send the link quality information, the state information of the first base station, and/or the synchronization level information to the second base station, so that the second base station selects to provide according to the link quality information, the state information, and/or the synchronization level information. A device that synchronizes references.

In this embodiment, the link quality information, such as SINR, RSRP, or RSRQ, between the first base station and the device that provides the synchronization reference for the first base station may be acquired by using the prior art. The status information of the first base station may be, for example, information indicating that the first base station is in a synchronized state, and the synchronization level information of the first base station may be, for example, It is stratum level information.

In this embodiment, the first base station may send the link quality information and the status information of the first base station to the second base station; or may send the link quality information and the synchronization level information of the first base station to the second Or the base station; or the link quality information, the status information of the first base station, and the synchronization level information of the first base station may be sent to the second base station. The second base station may select the device providing the synchronization reference according to the link quality information, the state information of the first base station, and/or the synchronization level information of the first base station.

The following takes the example of sending link quality information and synchronization level information as an example.

FIG. 4 is a diagram showing an example of an interaction method of inter-cell synchronization according to an embodiment of the present invention. As shown in FIG. 4, the base station 401 of the macro cell, the base station 402 of the small cell1, and the base station 403 of the small cell 2 are in a synchronized state. The base station 401 provides a synchronization reference by the GPS, and the stratum level is 0. The base station 402 and the base station 403 provide the synchronization reference by the base station 401, and the stratum level is 1. The SINR between the base station 401 and the base station 402 is -8 dB, and the SINR between the base station 401 and the base station 403 is -4 dB.

When the base station 404 of the small celB needs to perform synchronization, small cell1 and small cell2 can be found. The base station 404 can request the base station 402 and the base station 403 to transmit respective stratum level information and link quality information, such as SINR, of each and the previous level of the donor base station.

Then base station 402 can send stratum level=l, SINR=-8 between base station 401 and base station 402 to base station 404; base station 403 can send stratum level=l, SINR=-4 between base station 401 and base station 403 to Base station 404. The base station 404 can select one of the base stations (e.g., the base station 402 of the celll) as its donor base station according to the stratum level and SINR information respectively sent by the base station 402 and the base station 403.

The above shows that a cell/base station that has acquired synchronization can transmit its own link quality information with its donor cell/base station to other cells/base stations. The link quality information of the cell/base station and the donor cell/base station of the upper level may be sent only. The link quality information of the cell/base station and the donor cell/base station of the upper or higher level of the cell/base station may also be sent.

In this embodiment, the device that provides the synchronization reference for the first base station may further have one or more levels of devices that provide synchronization reference; the method further includes: a chain between devices that provide synchronization reference at one or more levels. The road quality information is sent to the second base station. The following is an example of another example.

FIG. 5 is another example diagram of an interaction method of inter-cell synchronization according to an embodiment of the present invention. As shown in FIG. 5, the base station 501 of the macro cell, the base station 502 of the small cell1, the base station 503 of the small cell 2, the base station 504 of the small celB, the base station 505 of the small cell 4, and the base station 506 of the small cell 5 are in a synchronized state. Where base station 501 is powered by GPS A synchronization reference is provided, and the stratum level is 0; the base station 502 and the base station 503 are provided with a synchronization reference by the base station 501, and the stratum level is 1, respectively. The base station 504 and the base station 505 are provided with a synchronization reference by the base station 502, and the base station 506 is provided with a synchronization reference by the base station 503, each having a stratum level of two.

As shown in FIG. 5, the SINR between the base station 501 and the base station 502 is -8 dB, and the SINR between the base station 501 and the base station 503 is -4 dB. The SINR between the base station 502 and the base station 504 is 2 dB, and the SINR between the base station 502 and the base station 505 is ldB. The SINR between the base station 503 and the base station 506 is 2 dB.

When the small cell 6 needs to be synchronized, the base station 507 of the small cell 6 is a slave base station, and small celB, small cell 4, and small cell 5 can be found. The base station 507 can request the stratum level information of the base station 504, the base station 505, and the base station 506, and the link quality information, such as the SINR, of the respective and all higher-level donor base stations.

Then, the base station 504 can set the stratum level=2, the base station 504 and the base station of the adjacent upper small cell1.

SINR = 2 between 502, and SIN = -8 between base station 502 of small cell1 and base station 501 of macro cell are transmitted to base station 507. The base station 505 can send the stratum level=2, the SINR=1 between the base station 505 and the base station 502 of the adjacent upper-level small cell1, and the SINR=-8 between the base station 502 of the small cell1 and the base station 501 of the macro cell. Base station 507. The base station 506 can send the stratum level=2, SINR=2 between the base station 503 of the adjacent upper-level small cell2, and the SINR=-4 between the base station 503 of the small cell2 and the base station 501 of the macro cell to the base station 507. . The base station 507 of the small cell 6 may select one of the base stations (e.g., the base station 505) as its donor base station according to the stratum level and SINR information respectively sent by the base station 504, the base station 505, and the base station 506.

Thereby, link quality information between devices providing synchronization reference at one or more levels can be provided, which provides further assistance for selecting a better donor base station for the second device. How the slave base station selects a donor base station from a plurality of potential donor base stations can be determined according to actual conditions. For example, the base station with the lowest stratum level may be selected first, and then one base station with the best link quality may be selected from the lowest base station of the stratum level; or the link quality and the stratum level may be jointly considered, for example, multiple potential donor base stations The link quality and the stratum level are respectively brought into a performance function, and the base station with the highest synchronization accuracy is selected.

In this embodiment, inter-cell synchronization can be implemented based on the air interface. In addition, the link quality information described above can be transmitted based on the air interface, the S1 loop, or the X2 loop.

Specifically, the slave base station and the donor base station may send or receive link quality information for synchronization through an interface defined between the base stations. For example, it can be through an S1 loop, or an X2 loop, or a newly defined base station. The interface is either sent or received over the air interface. Through the air interface, the link quality information between the base station and the device providing the synchronization reference for the base station, and the synchronization status information and the stratum level can be actively sent by the donor base station.

In this embodiment, the base station may be a Physical Downlink Shared Channel (PDSCH) or a Physical Uplink Shared Channel (PUSCH), or a Physical Downlink Control Channel (PDCCH) or a physical downlink control channel (PDCCH). The form-bearing and synchronization-related information (such as the above-mentioned link quality information, synchronization status information, and stratum level) of the uplink control channel (PUCCH) may also be carried by the newly defined physical channel.

In addition, the physical resources occupied by the channel for transmitting the synchronization-related information may be fixed, such as its time period and time offset, and the occupied frequency domain resources are one or more sets that can be fixed in advance. The time-frequency resources occupied by different base stations can be staggered to avoid strong interference. The time-frequency resources occupied by different base stations may vary depending on, for example, the stratum level. The base station receiving the synchronization and related information may detect the information on the corresponding resource according to a predetermined rule.

In this embodiment, the link quality information may include a value, for example, the interactive link quality information may be an absolute value. Alternatively, the link quality information may include an interval value reflecting the quality of the link; it may be a value quantized according to a preferentially set table.

Table 1 schematically shows link quality indication information. As shown in Table 1, for example, the interval of the link quality can be reflected by the way of the link indication bit.

Table 1

The link quality information is only schematically illustrated above, but the present invention is not limited thereto. The following describes how to send link quality information.

In this embodiment, the link quality information may be sent to the second base station periodically. For example, the cell/base station that has established the synchronization may send the link quality information to the surrounding cell/base station or the subordinate cell/base station. Alternatively, the link quality information may also be sent to the second base station if the trigger condition is met. The triggering condition may include: receiving a synchronization reference request sent by the second base station; or the first base station re-establishing synchronization; or the first base station determining that the link quality changes.

For example, when a cell initially establishes inter-cell synchronization, it may request other cells/base stations to send link quality information; or when a cell that has established synchronization loses synchronization and needs to re-synchronize, may request other cells/base stations to send link quality information; Or when a cell finds that the link quality changes significantly, it can request link quality information from other cells/base stations.

The synchronized cell/base station may send the link quality information only after receiving the request of the other cell/base station; or after the cell re-establishes the synchronization, it may actively send the link quality information to other cells/base stations; or When the cell finds that the link quality changes significantly, it can actively send link quality information to other cells/base stations.

It can be seen from the above embodiment that by adding a new link quality information reflecting the potential donor base station, it can be helpful to select a better donor base station for the slave base station. The slave base station can select a better donor base station based on the obtained link quality information of the potential donor base station, thereby improving the performance of the entire synchronous link. Example 2

The embodiment of the present invention provides an inter-cell synchronization interaction method, which is described on the side of a device (ie, a slave base station) that needs to be synchronized. The same content as that in Embodiment 1 is not described herein.

FIG. 6 is a flowchart of an interaction method of inter-cell synchronization according to an embodiment of the present invention. As shown in FIG. 6, the method includes:

Step 601: The second base station receives, by using one or more first base stations, link quality information between the first base station and a device that provides a synchronization reference for the first base station.

Step 602: The second base station selects, according to the received link quality information, a device that provides a synchronization reference from one or more first base stations.

In this embodiment, the first base station may be a base station that is already in a synchronized state, and the second base station may be a base station that is still in an unsynchronized state. The second base station (slave base station) can synchronize after selecting a device (e.g., donor base station) that provides a synchronization reference. How to synchronize can refer to the prior art.

In this embodiment, the second base station may further receive status information and/or synchronization level information of the first base station, and the second base station may be based on the received link quality information, status information of the first base station, and/or synchronization level information. To choose the device that provides the synchronization reference. In this embodiment, the second base station may further receive, by the first base station, link quality information between the devices that provide the synchronization reference in one or more levels; and provide the synchronization reference according to the first base station and the first base station. Link quality information between devices, and link quality information between devices providing synchronization reference at one or more levels to select a device that provides a synchronization reference.

It can be seen from the above embodiment that by adding a new link quality information reflecting the potential donor base station, it can be helpful to select a better donor base station for the slave base station. The slave base station can select a better donor base station based on the obtained link quality information of the potential donor base station, thereby improving the performance of the entire synchronous link. Example 3

The embodiment of the present invention provides an interaction device for inter-cell synchronization, and the same content as that of Embodiment 1 is not described herein. FIG. 7 is a schematic structural diagram of an inter-cell synchronization interaction apparatus according to an embodiment of the present invention. As shown in FIG. 7, the interaction apparatus 700 includes:

The information sending unit 701 sends, to the second base station, link quality information between the first base station in the synchronization state and the device that provides the synchronization reference for the first base station, so that the second base station selects to provide synchronization according to the link quality information. Reference device.

The link quality information may include: signal to interference and noise ratio information, reference signal received power information, or reference signal reception quality information; however, the present invention is not limited thereto. In a specific implementation, the link quality information may include, for example, a value or an interval value reflecting the quality of the link.

In an embodiment, the information sending unit 701 is further configured to send status information and/or synchronization level information of the first base station to the second base station.

In another embodiment, the first base station further has one or more levels of devices that provide synchronization reference; the information sending unit 701 is further configured to send link quality information between the devices that provide synchronization reference in one or more levels to Second base station.

In another embodiment, the information transmitting unit 701 can transmit link quality information based on an air interface, an S1 loop, or an X2 loop.

In another embodiment, the information transmitting unit 701 can periodically transmit the link quality information to the second base station. Or the link quality information may be sent to the second base station if the trigger condition is met; wherein the triggering condition may include: receiving a synchronization reference request sent by the second base station; or the first base station re-establishing synchronization; or the first base station It is judged that the link quality has changed. As shown in FIG. 7, the interaction apparatus 700 may further include: an information acquiring unit 702, configured to acquire link quality information between a first base station and a device that provides a synchronization reference for the first base station.

The embodiment of the present invention further provides a base station, which is a first base station in a synchronized state, and includes an inter-cell synchronization interaction device as described above.

FIG. 8 is a schematic diagram of a structure of a base station according to an embodiment of the present invention. As shown in FIG. 8, base station 800 can include: a central processing unit (CPU) 200 and memory 210; and memory 210 coupled to central processor 200. The memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200 to receive various information transmitted by the user equipment and to transmit request information to the user equipment.

In one embodiment, the functionality of the inter-synchronized interactive device can be integrated into the central processor 200. The central processing unit 200 may be configured to perform control of: transmitting link quality information between the base station in a synchronized state and a device that provides a synchronization reference for the base station to the second base station, so that the second base station is configured according to The link quality information selects a device that provides a synchronization reference.

The central processing unit 200 may be further configured to: control status information and/or synchronization level information of the base station to the second base station, so that the second base station is configured according to the link quality information, the status information And/or synchronization level information to select the device that provides the synchronization reference.

The device that provides the synchronization reference for the base station further has a device that provides a synchronization reference in one or more stages; the central processor 200 can also be configured to perform the following control: the device that provides the synchronization reference in the one or more stages The link quality information between the two is sent to the second base station.

In another embodiment, the inter-synchronous interaction device may be configured separately from the central processing unit. For example, the inter-cell synchronization interaction device may be configured as a chip connected to the central processing unit 200, and the cell is implemented by the control of the central processing unit. The function of an interactive device that is synchronized.

In addition, as shown in FIG. 8, the base station 800 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the above components are similar to the prior art, and details are not described herein again. It should be noted that the base station 800 does not necessarily have to include all of the components shown in FIG. 8. In addition, the base station 800 may also include components not shown in FIG. 8, and reference may be made to the prior art.

It can be seen from the above embodiment that by adding a new link quality information that can reflect the potential donor base station, it can be helpful to select a better donor base station for the slave base station. The slave base station can select a better donor base station based on the obtained link quality information of the potential donor base station, thereby improving the performance of the entire synchronous link. Example 4

The embodiment of the present invention provides an interaction device for inter-cell synchronization, and the same content as that of Embodiment 2 is not described herein. FIG. 9 is a schematic structural diagram of an inter-cell synchronization interaction apparatus according to an embodiment of the present invention. As shown in FIG. 9, the interaction apparatus 900 includes:

The information receiving unit 901 receives, by using one or more first base stations, link quality information between the first base station and a device that provides a synchronization reference for the first base station;

The synchronization selecting unit 902 selects a device that provides a synchronization reference from one or more first base stations according to the received link quality information.

In this embodiment, the first base station may be a base station that is already in a synchronized state. Synchronization selection unit 902 can synchronize after selecting a device (e.g., donor base station) that provides a synchronization reference. How to synchronize specifically can refer to the prior art.

In an embodiment, the information receiving unit 901 may further receive status information and/or synchronization level information of the first base station, and the synchronization selecting unit 902 may select according to the received link quality information, status information, and/or synchronization level information. A device that provides a synchronous reference.

In another embodiment, the information receiving unit 901 may further receive link quality information between the devices that provide the synchronization reference by the first base station, and the synchronization selection unit 902 may also be configured according to the first base station. The first base station provides link quality information between devices that are synchronized reference, and link quality information between devices that provide synchronization reference at one or more levels to select a device that provides a synchronization reference.

The embodiment of the invention further provides a base station, which is a second base station in an unsynchronized state, and includes an inter-cell synchronization interaction device as described above. The configuration of the base station can be as shown in FIG.

In one embodiment, the functionality of the inter-synchronized interactive device can be integrated into the central processor 200. In another embodiment, the inter-synchronous interaction device may be configured separately from the central processing unit. For example, the inter-cell synchronization interaction device may be configured as a chip connected to the central processing unit 200, and the cell is implemented by the control of the central processing unit. The function of an interactive device that is synchronized.

It can be seen from the above embodiment that by adding a new link quality information that can reflect the potential donor base station, it can be helpful to select a better donor base station for the slave base station. The slave base station can select a better donor base station based on the obtained link quality information of the potential donor base station, thereby improving the performance of the entire synchronous link. Example 5

The embodiment of the present invention further provides a communication system, which includes a first base station and a second base station, and the same contents as those in Embodiments 1 to 4 are not described herein.

FIG. 10 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention. As shown in FIG. 10, the communication system 1000 includes a first base station 1001 and a second base station 1002. The first base station 1001 transmits the link quality information between the first base station 1001 and the device that provides the synchronization reference for the first base station 1001 to the second base station 1002. The second base station 1002 is configured according to the link quality information. Select the device that provides the synchronization reference.

In this embodiment, the first base station 1001 may be a base station in a synchronized state, including the inter-cell synchronization interaction apparatus as described in Embodiment 3; the second base station 1002 may be a base station in an unsynchronized state, including the embodiment. 4 The inter-cell synchronization interaction device.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to perform inter-cell synchronization interaction as described in Embodiment 1 or 2 above in the base station method.

Embodiments of the present invention also provide a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an inter-cell synchronization interaction method as described in Embodiment 1 or 2 above in a base station.

The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are illustrative and not restrictive. Those skilled in the art can according to this The spirit and the spirit of the invention are variously modified and modified by the invention, and such modifications and modifications are also within the scope of the invention.

Claims

claims

1. An interactive method for inter-cell synchronization, the method includes:

Send the link quality information between the first base station in the synchronization state and the device that provides the synchronization reference for the first base station to the second base station, so that the second base station selects and provides the synchronization reference according to the link quality information. device of.

2. The interaction method according to claim 1, wherein the method further includes:

Send the status information and/or synchronization level information of the first base station to the second base station, so that the second base station selects and provides the link quality information, the status information, and/or the synchronization level information. Device to synchronize reference to.

3. The interaction method according to claim 1, wherein the device that provides a synchronization reference for the first base station also has one or more levels of devices that provide a synchronization reference;

The method further includes: sending link quality information between the one or more levels of devices providing synchronization reference to the second base station.

4. The interaction method according to claim 1, wherein the method further includes: based on an air interface,

The link quality information is sent by an S1 interface, an X2 interface or a newly defined interface between base stations.

5. The interaction method according to claim 1, wherein the link quality information includes: signal-to-interference-to-noise ratio information, reference signal received power information or reference signal received quality information.

6. The interaction method according to claim 1, wherein the link quality information is periodically sent to the second base station; or

If the trigger condition is met, the link quality information is sent to the second base station.

7. The interaction method according to claim 6, wherein the triggering conditions include:

Receive a synchronization reference request sent by the second base station; or

The first base station re-establishes synchronization; or

The first base station determines that the link quality changes.

8. The interaction method according to claim 1, wherein the link quality information includes a numerical value or an interval value reflecting the link quality.

9. The interaction method according to claim 1, wherein, before sending the link quality information between the first base station in synchronization state and the device providing synchronization reference for the first base station to the second base station, Shufang The law also includes:

Obtain link quality information between the first base station and a device that provides a synchronization reference for the first base station.

10. An interactive device for inter-cell synchronization, the interactive device includes:

An information sending unit is configured to send the link quality information between the first base station in synchronization state and the device that provides synchronization reference for the first base station to the second base station, so that the second base station can adjust the link quality information according to the link quality information. Select the device that provides the synchronization reference.

11. The interaction device according to claim 10, wherein the information sending unit is further configured to send status information and/or synchronization level information of the first base station to the second base station.

12. The interaction device according to claim 10, wherein the device that provides a synchronization reference for the first base station also has one or more levels of equipment that provides a synchronization reference;

The information sending unit is also configured to send link quality information between the one or more levels of devices providing synchronization reference to the second base station.

13. The interaction device according to claim 10, wherein the information sending unit sends the link quality information based on an air interface, an S1 interface, an X2 interface or a newly defined interface between base stations.

14. The interactive device according to claim 10, wherein the link quality information includes: signal-to-interference-to-noise ratio information, reference signal received power information or reference signal received quality information.

15. The interactive device according to claim 10, wherein the information sending unit periodically sends the link quality information to the second base station; or when triggering conditions are met, the link quality information is sent to the second base station. Quality information is sent to the second base station.

16. The interactive device according to claim 15, wherein the triggering condition includes:

Receive a synchronization reference request sent by the second base station; or

The first base station re-establishes synchronization; or

The first base station determines that the link quality changes.

17. The interactive device according to claim 10, wherein the link quality information includes a numerical value or an interval value reflecting the link quality.

18. The interactive device according to claim 1, wherein the device further includes:

An information acquisition unit is configured to acquire link quality information between the first base station and a device that provides a synchronization reference for the first base station.

19. A communication system, including: The first base station sends the link quality information between the first base station and the device that provides synchronization reference for the first base station to the second base station;

The second base station selects a device that provides a synchronization reference according to the link quality information.

20. The communication system according to claim 19, wherein the first base station is a base station in a synchronized state, and the second base station is a base station in an unsynchronized state.