CN104812049A - Method and equipment for synchronization between base stations - Google Patents

Abstract

The invention discloses a method and a piece of equipment for synchronization between base stations. The method comprises the following steps: acquiring synchronization configuration information of a synchronization source base station, wherein the synchronization configuration information contains guard period GP information of a special sub frame used for bearing a synchronization signal of the synchronization source base station; and receiving a synchronization signal sent by the synchronization source base station according to the GP information of the special sub frame contained in the synchronization configuration information, and maintaining clock synchronization with the synchronization source base station by using the received synchronization signal. The synchronization source base station uses the GP information of the special sub frame to bear the synchronization signal, and a base station to be synchronized uses the synchronization configuration information of the synchronization source base station to acquire the synchronization signal. Thus, clock synchronization between base stations with different levels of synchronization is realized, the problem of poor synchronization relay capability between base stations with different levels of synchronization is avoided, and the efficiency of synchronization between base stations with different levels of synchronization is improved.

Description

A method and device for synchronization between base stations

technical field

The present invention relates to the technical field of wireless communication, in particular to a method and device for synchronizing between base stations based on an LTE TDD (Long Term Evolution Time Division Duplex, Long Term Evolution Time Division Duplex) system.

Background technique

In order to suppress signal interference between base stations, TDD (Time Division Duplex, Time Division Duplex) base stations deployed on the same frequency need to perform clock synchronization between base stations. In 3GPP (3rd Generation Partnership Project, the third generation mobile communication standardization organization), three clock synchronization schemes between base stations are specified:

The first clock synchronization scheme between base stations is: based on GNSS (Global Navigation Satellite System, Global Navigation Satellite System) satellite synchronization, for example: GPS (Global Positioning System, Global Positioning System) synchronization.

The second clock synchronization scheme between base stations is based on ideal backhaul network synchronization, for example: IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) 1588V2 synchronization.

The third clock synchronization scheme between base stations is: air interface synchronization (that is, Radio-Interface Based Synchronization Mechanism, wireless internal synchronization mechanism).

However, in typical application scenarios of LTE (Long Term Evolution, long-term evolution) such as indoors and high-rise hotspots, when using the first method to achieve clock synchronization between base stations, the reference signal of the synchronization source base station is not easy to obtain, making the clock between base stations Synchronization is not easy to achieve; when using the second method to achieve clock synchronization between base stations, since IEEE1588 synchronizes the internal clock of the base station with the master clock of the master computer through hardware and software, the clock synchronization between base stations cannot be guaranteed during specific use; therefore , air interface synchronization has become the mainstream solution for clock synchronization between base stations.

At present, an air interface synchronization technology of Network Listening (NW, Network Listening) is proposed in 3GPP. Among them, the air interface synchronization technology of network interception proposes two implementation methods:

The first implementation method is: based on MBSFN (Multicast/Broadcast Signal Frequency Network, multicast/broadcast single frequency network) subframe network listening scheme; the second implementation method is: based on TDD (Time Division Duplex, time division duplex) Network listening scheme for special subframes.

Specifically, in the network listening solution based on MBSFN subframes, MBSFN is used to send multicast signals. Since 3GPP stipulates that the uplink and downlink time slot ratio configuration mode in the LTE system satisfies that there is a subframe for sending downlink data in each uplink and downlink transmission cycle, once the network listening scheme based on the MBSFN subframe is applied to the LTE system, it will The only subframe used to send downlink data is used to send multicast signals, so that there is no resource for transmitting other public service signals (for example: reference signals) of the cell, so that clock synchronization between base stations cannot be performed.

In order to solve the problem that the clock synchronization between base stations cannot be synchronized in the network interception scheme based on MBSFN subframes, a silence method is proposed, namely, interception silence and interference suppression silence, but the inter-base station can only be realized between four adjacent levels of base stations Clock synchronization makes the synchronous relay capability between synchronous base stations poor, and there is a problem of relatively large system signaling overhead.

In the TDD special subframe-based network listening scheme, the GP (GuardPeriod, guard interval) interval in the TDD special time slot is used to transmit clock synchronization signals between base stations of different levels. However, due to the limited length of GP, the synchronization base station The synchronization relay ability between them is poor.

Contents of the invention

Embodiments of the present invention provide a method and device for synchronizing between base stations, which are used to solve the problem of poor synchronizing relay capability between synchronizing base stations existing in the method for synchronizing between synchronizing base stations currently used, resulting in low synchronizing efficiency between various base stations in the system.

A method for synchronization between base stations, applied in the long term evolution time division duplex LTE TDD system, comprising:

Obtaining synchronization configuration information of the synchronization source base station, wherein the synchronization configuration information includes guard interval GP information of a special subframe used to carry the synchronization signal of the synchronization source base station;

According to the GP information of the special subframe included in the synchronization configuration information, receive a synchronization signal sent by the synchronization source base station, and use the received synchronization signal to maintain a clock with the synchronization source base station Synchronize.

The acquisition of synchronization configuration information of the synchronization source base station includes:

receiving the synchronization level information of the base station sent by the core network or the synchronization source base station;

The synchronization configuration information of the synchronization source base station is determined according to the preset correspondence between the synchronization level information and the synchronization configuration information.

The acquisition of synchronization configuration information of the synchronization source base station includes:

The synchronization level information of the base station and the synchronization configuration information corresponding to the synchronization level information sent by the core network or the synchronization source base station are received.

The GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

According to the GP information of the special subframe included in the synchronization configuration information, receiving the synchronization signal sent by the synchronization source base station includes:

Receive the synchronization signal sent by the synchronization source base station on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the acquired synchronization configuration information.

Obtain the synchronization configuration information of the synchronization source base station, including:

Obtain the synchronization configuration information of the synchronization source base station through wired transmission or air interface monitoring.

A method for synchronization between base stations, applied in the long term evolution time division duplex LTE TDD system, comprising:

determining synchronization configuration information, wherein the synchronization configuration information includes guard interval GP information of special subframes used to carry synchronization signals;

The synchronization signal is sent to the base station to be synchronized by using the GP information of the special subframe carrying the synchronization signal included in the synchronization configuration information.

The determining synchronization configuration information includes:

Obtain the correspondence between preset synchronization level information and synchronization configuration information;

According to its own synchronization level and the corresponding relationship, determine its own synchronization configuration information.

The determining synchronization configuration information includes:

Receive the correspondence between the synchronization level information sent by the core network and the synchronization configuration information;

Determine its own synchronization configuration information according to its own synchronization level and the corresponding relationship.

The GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

The sending the synchronization signal to the base station to be synchronized by using the GP information of the special subframe carrying the synchronization signal included in the synchronization configuration information includes:

The synchronization signal is sent on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the acquired synchronization configuration information.

A device for synchronization between base stations, applied in the long-term evolution time division duplex LTE TDD system, including:

A receiving module, configured to obtain synchronization configuration information of a synchronization source base station, wherein the synchronization configuration information includes guard interval GP information of a special subframe used to carry a synchronization signal of the synchronization source base station;

a synchronization module, configured to receive a synchronization signal sent by the synchronization source base station according to the GP information of the special subframe contained in the synchronization configuration information, and use the received synchronization signal to maintain the synchronization with the synchronization source Clock synchronization between base stations.

The receiving module is specifically configured to receive the synchronization level information of the base station sent by the core network or the synchronization source base station; determine the synchronization level information of the synchronization source base station according to the preset correspondence between synchronization level information and synchronization configuration information Synchronize configuration information.

The receiving module is specifically configured to receive the synchronization level information of the base station and the synchronization configuration information corresponding to the synchronization level information sent by the core network or the synchronization source base station.

The GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

The synchronization module is specifically configured to receive the synchronization on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal contained in the obtained synchronization configuration information. The synchronization signal sent by the source base station.

The receiving module is specifically configured to obtain the synchronization configuration information of the synchronization source base station through wired transmission or air interface monitoring.

A device for synchronization between base stations, applied in the long-term evolution time division duplex LTE TDD system, including:

A determining module, configured to determine synchronization configuration information, wherein the synchronization configuration information includes guard interval GP information of special subframes used to carry synchronization signals;

A sending module, configured to send the synchronization signal to the base station to be synchronized by using the GP information of the special subframe used to carry the synchronization signal included in the synchronization configuration information.

The determination module is specifically configured to acquire the correspondence between preset synchronization level information and synchronization configuration information; determine its own synchronization configuration information according to its own synchronization level and the correspondence.

The determining module is specifically configured to receive the correspondence between the synchronization level information and the synchronization configuration information sent by the core network; determine its own synchronization configuration information according to its own synchronization level and the correspondence.

The GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

The sending module is specifically configured to send the synchronization signal on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the obtained synchronization configuration information.

The beneficial effects of the present invention are as follows:

In the embodiment of the present invention, the synchronization configuration information of the synchronization source base station is obtained, and the synchronization configuration information includes the guard interval GP information of the special subframe used to carry the synchronization signal of the synchronization source base station; according to the synchronization configuration information The GP information contained in the special subframe receives the synchronization signal sent by the synchronization source base station, and uses the received synchronization signal to maintain clock synchronization with the synchronization source base station. In this way, the synchronization source base station The GP information of the special subframe is used to carry the synchronization signal, and the base station to be synchronized uses the synchronization configuration information of the synchronization source base station to obtain the synchronization signal, so that the clock synchronization between the base stations of different synchronization levels is realized, and the synchronization between the base stations of different synchronization levels is effectively avoided The problem of poor relay capability improves the synchronization efficiency between base stations of different synchronization levels.

Description of drawings

FIG. 1 is a schematic flowchart of a method for synchronization between base stations provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic flowchart of a method for synchronization between base stations provided by Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of an inter-base station synchronization device provided in Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a device for synchronizing between base stations according to Embodiment 4 of the present invention.

Detailed ways

In order to achieve the purpose of the present invention, an embodiment of the present invention provides a method and device for inter-base station synchronization. By obtaining the synchronization configuration information of the synchronization source base station, the synchronization configuration information includes the information used to carry the synchronization source base station. The guard interval GP information of the special subframe of the synchronization signal; according to the GP information of the special subframe included in the synchronization configuration information, receive the synchronization signal sent by the synchronization source base station, and use the received synchronization signal , to maintain clock synchronization with the synchronization source base station, so that the synchronization source base station uses the GP information of the special subframe to carry the synchronization signal, and the base station to be synchronized uses the synchronization configuration information of the synchronization source base station to obtain the synchronization signal, so that different synchronization levels The clock synchronization between base stations can effectively avoid the problem of poor synchronization relay capability between base stations of different synchronization levels, and improve the synchronization efficiency between base stations of different synchronization levels.

It should be noted that the embodiments of the present invention are applied in scenarios including but not limited to: configuration mode 0 of base station uplink and downlink time slot ratios.

Wherein, the scenario of the base station uplink and downlink time slot ratio configuration mode 0 means that when the uplink and downlink time slot ratio configuration length is 5 ms or 10 ms, there is a subframe every 5 ms for transmitting downlink signals.

Various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one:

As shown in FIG. 1 , it is a schematic flowchart of a method for synchronization between base stations provided by Embodiment 1 of the present invention. The method can be described as follows.

Step 101: Obtain synchronization configuration information of a synchronization source base station.

Wherein, the synchronization configuration information includes guard interval GP information of a special subframe used to carry the synchronization signal of the synchronization source base station.

In step 101, in the LTE TDD system, since the uplink and downlink signals are transmitted in a time-division manner, when a transmission time interval (TTI, Transmission Time Interval) of 1 ms is used, the switching period of the uplink and downlink signals is at least 5 ms.

In TD-LTE, the physical layer frame structure is as follows: a wireless frame length is 10ms, including two half-frames, each half-frame length is 5ms, each half-frame includes 5 subframes, each subframe The length is 1ms.

In addition, there are multiple time slot ratio configurations in the TD-LTE frame structure, which can be divided into 5ms cycle and 10ms cycle, which can flexibly support uplink and downlink services with different ratios.

That is to say, in the configuration of the uplink and downlink timing in the TD-LTE frame structure, the downlink to uplink switching periods of 5 ms and 10 ms are supported.

Wherein, in the period of 5ms, subframe 1 and subframe 6 are fixedly configured as special subframes; in the period of 10ms, subframe 1 is fixedly configured as a special subframe.

Each special subframe consists of 3 special time slots: DwPTS (for transmission of downlink data), GP (guard interval) and UpPTS (for transmission of uplink data).

As shown in Table 1, it is the configuration table of special subframes (unit: symbol):

Table 1

It can be seen from Table 1 that the three special time slots in each special subframe can be configured with different OFDM symbols to form different time slot configuration ratios, so that the TDD system can flexibly configure specific uplink and downlink resource ratios, and more Good support for different business types.

In this way, with the development of services such as the Internet, the time slot ratio of the uplink and downlink subframes can be flexibly configured according to the amount of data transmitted in the uplink and downlink services, effectively improving resource utilization.

Based on the inherent characteristics of the TDD system, using the ability of the TDD system to flexibly configure the ratio of uplink and downlink resources, the network side configures synchronization configuration information for each base station within the jurisdiction, which includes the synchronization signal used to carry the synchronization source base station The guard interval GP information of the special subframe.

Wherein, the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal.

Wherein, the period information of the special subframe used to carry the synchronization signal is greater than or equal to the uplink-downlink switching period.

For example: the period information of the special subframe used to carry the synchronization signal is 20ms, which means that the GP of the special subframe carries the synchronization signal every 20ms, and not every GP in the special subframe sent carries the synchronization signal , which means that the base station to be synchronized needs to collect the synchronization signal sent by the synchronization source base station every 20 ms when receiving the reference signal sent by the synchronization source base station.

Among them, the offset information of the special subframe used to carry the synchronization signal refers to the special subframe that will be sent in the number of 5ms in the unit of 5ms within the transmission period of a special subframe used to carry the synchronization signal The GP carries synchronization signals.

For example: still taking the period information of the special subframe used to carry the synchronization signal as 20ms as an example, the offset information of the special subframe of the base station with synchronization level 0 is the first 5ms, then the synchronization signal of the base station with synchronization level 0 will be It is sent through the GP of the special subframe at the first 5ms of the 20ms period; the offset information of the special subframe of the base station of synchronization level 1 is the second 5ms, then the synchronization signal of the base station of synchronization level 1 will be in the 20ms period The second 5ms within the period is sent by the GP of the special subframe; the offset information of the special subframe of the base station of synchronization level 2 is the third 5ms, then the synchronization signal of the base station of synchronization level 2 will be sent in the 20ms period 3 times of 5ms are sent through the GP of the special subframe; ...; and so on.

It should be noted that base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

At this time, for the case where base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, the OFDM symbols in the GPs actually used for carrying synchronization signals in special subframes can be the same or different, which is not limited here .

In another embodiment of the present invention, the GP information of the special subframe further includes information of an OFDM symbol used to carry the synchronization signal of the synchronization source base station.

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

For example: still taking the period information of the special subframe used to carry the synchronization signal as 20ms as an example, the offset information of the special subframe of the base station with synchronization level 0 is the first 5ms, then the synchronization signal of the base station with synchronization level 0 will be It is sent through the GP of the special subframe at the first 5ms of the 20ms period; the offset information of the special subframe of the base station of synchronization level 1 is the first 5ms, then the synchronization signal of the base station of synchronization level 1 will be in the 20ms period During the first 5 ms within the period, the GP of the special subframe is sent. At this time, the base station of synchronization level 0 and the base station of synchronization level 1 use different OFDM symbol information of the GP of the special subframe for carrying the synchronization signal, that is, synchronization The OFDM symbol information of the GP of the special subframe used by the base station of level 0 to carry the synchronization signal is the m0th OFDM symbol; the OFDM symbol information of the GP of the special subframe used by the base station of synchronization level 1 to carry the synchronization signal is the m1th OFDM symbol.

In another embodiment of the present invention, the manner in which the network side configures synchronization configuration information for each base station within its jurisdiction includes but is not limited to:

Configure the correspondence between synchronization configuration information and synchronization levels.

In this way, the network side notifies the base station of the relationship between the synchronization configuration information and the synchronization level information by broadcasting or other means, so that the base station determines the synchronization configuration corresponding to its own synchronization level when receiving the relationship between the synchronization configuration information and the synchronization level information information, and send synchronization signals according to the determined synchronization configuration information.

It should be noted that the correspondence between the synchronization level information and the synchronization configuration relationship may also be pre-configured in the base station, which is not limited here.

First, the network side determines the configuration relationship between the synchronization source base station and the three special time slots in the special subframe of the synchronization base station.

One is that the configuration relationship of the three special time slots in the special subframe of the synchronization source base station and the base station to be synchronized is the same.

For example: the synchronization source base station and the base station to be synchronized have a total of 5 synchronization levels (ie {0, 1, 2, 3, 4}), and the synchronization source base station and the base station to be synchronized both use the uplink and downlink time slot configuration mode 0 (that is, the length of 10ms There are two special subframes), and DwPTS:GP:UpPTS in each special subframe satisfies 6:6:2.

The other is that the configuration relationship of the three special time slots in the special subframe of the synchronization source base station and the synchronization base station is different.

For example: the synchronization source base station and the base station to be synchronized have a total of 5 synchronization levels (ie {0, 1, 2, 3, 4}), and the synchronization source base station and the base station to be synchronized both use the uplink and downlink time slot configuration mode 0 (that is, the length of 10ms There are two special subframes), however, DwPTS:GP:UpPTS in each special subframe in the base station of synchronization level {0, 1, 2} satisfies 6:6:2, and the synchronization level {3, 4} DwPTS:GP:UpPTS in each special subframe in the base station satisfies 3:9:2.

Secondly, the network side determines the OFDM symbols of the GPs of the special subframes used by base stations of different levels to carry synchronization signals according to the OFDM symbols configured for the GPs in the special subframes in the base station.

Wherein, the OFDM symbol information used to carry the synchronization signal is different between base stations of different synchronization levels.

Alternatively, base stations of different synchronization levels use time division multiplexing to allocate OFDM symbols of GPs of special subframes for carrying synchronization signals to base stations of each synchronization level, so that base stations of different synchronization levels are used to carry synchronization signals The OFDM symbols of the GP of the special subframe satisfy the orthogonal relationship.

For example: the number of OFDM symbols used by base stations of synchronization level 0 to carry synchronization signals is 1; the number of OFDM symbols used by base stations of synchronization level 1 to carry synchronization signals is 2; the number of OFDM symbols used by base stations of synchronization level 2 to carry The number of OFDM symbols of the synchronization signal is 3; ...; and so on.

Another example: the OFDM symbol used by the base station of synchronization level 0 to carry the synchronization signal is the m0th OFDM symbol; the OFDM symbol used by the base station of synchronization level 1 to carry the synchronization signal is the m1th OFDM symbol; the base station of the synchronization level 2 is used for The OFDM symbol carrying the synchronization signal is the m2th OFDM symbol;  …; and so on.

Specifically, the manners of obtaining the synchronization configuration information of the synchronization source base station include but are not limited to the following manners:

The first way:

First, the synchronization level information of the base station sent by the core network or the synchronization source base station is received.

Secondly, the synchronization configuration information of the synchronization source base station is determined according to the preset correspondence between the synchronization level information and the synchronization configuration information.

The second way:

The synchronization level information of the base station and the synchronization configuration information corresponding to the synchronization level information sent by the core network or the synchronization source base station are received.

Specifically, the synchronization configuration information of the synchronization source base station is acquired through wired transmission or air interface monitoring.

Step 102: According to the GP information of the special subframe contained in the synchronization configuration information, receive the synchronization signal sent by the synchronization source base station, and use the received synchronization signal to maintain a relationship with the synchronization source base station Clock synchronization between.

In step 102, the synchronization configuration information further includes period information and/or offset information of special subframes carrying synchronization signals.

Specifically, according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the received synchronization configuration information, receive the synchronization signal sent by the synchronization source base station on the GP of the special subframe. synchronization signal.

For example: still taking the period information of the special subframe used to carry the synchronization signal as 20ms as an example, the offset information of the special subframe of the base station with synchronization level 0 is the first 5ms, then the synchronization signal of the base station with synchronization level 0 will be In the first 5ms of the 20ms period, it is sent through the GP of the special subframe. At this time, the base station to be synchronized needs to receive the synchronization signal sent by the synchronization source base station in the first 5ms of the 20ms period; the base station of synchronization level 1 The offset information of the special subframe is the second 5ms, then the synchronization signal of the base station of synchronization level 1 will be sent by the GP of the special subframe at the second 5ms within the 20ms period, and the base station to be synchronized needs to be in 20ms The synchronization signal sent by the synchronization source base station is received at the second 5ms in the period; the offset information of the special subframe of the base station of synchronization level 2 is the third 5ms, then the synchronization signal of the base station of synchronization level 2 will be within 20ms The third 5ms in the period is sent through the GP of the special subframe. At this time, the base station to be synchronized needs to receive the synchronization signal sent by the synchronization source base station at the third 5ms in the 20ms period; ...; and so on.

It should be noted that after receiving the synchronization configuration information sent by the synchronization source base station, the base station to be synchronized receives the synchronization signal sent by the synchronization source base station according to the synchronization configuration information, which can effectively improve synchronization efficiency.

It should be noted that the synchronization signal in the embodiment of the present invention may be a synchronization signal sequence, may also be a legacy reference signal, or may be a dedicated synchronization signal, which is not limited here.

Through the solution of Embodiment 1 of the present invention, the synchronization configuration information of the synchronization source base station is obtained, and the synchronization configuration information includes the guard interval GP information of the special subframe used to carry the synchronization signal of the synchronization source base station; according to the The GP information of the special subframe contained in the synchronization configuration information receives the synchronization signal sent by the synchronization source base station, and uses the received synchronization signal to maintain clock synchronization with the synchronization source base station, so that , the synchronization source base station uses the GP information of the special subframe to carry the synchronization signal, and the base station to be synchronized uses the synchronization configuration information of the synchronization source base station to obtain the synchronization signal, so that the clock synchronization between the base stations of different synchronization levels is realized, effectively avoiding the synchronization of different synchronization levels The problem of poor synchronization relay capability between base stations improves the synchronization efficiency between base stations of different synchronization levels.

Embodiment two:

As shown in FIG. 2 , it is a schematic flowchart of a method for synchronization between base stations provided by Embodiment 2 of the present invention. Embodiment 2 of the present invention is an invention under the same inventive concept as Embodiment 1 of the present invention, and is applied in a long-term evolution time division duplex LTE TDD system, and the method may be described as follows.

Step 201: the synchronization source base station determines synchronization configuration information.

Wherein, the synchronization configuration information includes the guard interval GP information of the special subframe used to carry the synchronization signal.

In step 201, the ways to determine the synchronization configuration information include but not limited to the following ways:

The first way:

Firstly, the correspondence between preset synchronization level information and synchronization configuration information is acquired.

Secondly, according to its own synchronization level and the corresponding relationship, determine its own synchronization configuration information.

The second way:

First, the corresponding relationship between the synchronization level information and the synchronization configuration information sent by the core network is received.

Secondly, according to its own synchronization level and the corresponding relationship, determine its own synchronization configuration information.

Wherein, the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

Step 202: Send the synchronization signal to the base station to be synchronized by using the GP information of the special subframe used to carry the synchronization signal included in the synchronization configuration information.

In step 202, sending the synchronization signal to the base station to be synchronized by using the GP information of the special subframe used to carry the synchronization signal contained in the synchronization configuration information includes:

The synchronization signal is sent on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the acquired synchronization configuration information.

Through the solution of Embodiment 2 of the present invention, the synchronization source base station sends the synchronization configuration information to the base station to be synchronized, so that the base station to be synchronized uses the synchronization configuration information sent by the synchronization source base station to obtain a synchronization signal, realizing clock synchronization between base stations of different synchronization levels , effectively avoiding the problem of poor synchronization relay capability between base stations of different synchronization levels, and improving the synchronization efficiency between base stations of different synchronization levels.

Embodiment three:

As shown in Figure 3, it is a schematic structural diagram of an inter-base station synchronization device provided by Embodiment 3 of the present invention. Embodiment 3 of the present invention is an invention under the same inventive concept as Embodiment 1 and Embodiment 2 of the present invention. , applied in the Long Term Evolution Time Division Duplex LTE TDD system, the device includes: a receiving module 11 and a synchronization module 12, wherein:

The receiving module 11 is configured to obtain synchronization configuration information of the synchronization source base station, wherein the synchronization configuration information includes guard interval GP information of a special subframe used to carry the synchronization signal of the synchronization source base station;

The synchronization module 12 is configured to receive the synchronization signal sent by the synchronization source base station according to the GP information of the special subframe included in the synchronization configuration information, and use the received synchronization signal to maintain synchronization with the Clock synchronization between source base stations.

In another embodiment of the present invention, the receiving module 11 is specifically configured to receive the synchronization level information of the base station sent by the core network or the synchronization source base station; The correspondence relationship of the synchronization source base station is determined to determine the synchronization configuration information of the synchronization source base station.

In another embodiment of the present invention, the receiving module 11 is specifically configured to receive the synchronization level information of the base station and the synchronization configuration information corresponding to the synchronization level information sent by the core network or the synchronization source base station.

In another embodiment of the present invention, the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

The synchronization module 12 is specifically configured to receive, on the GP of the special subframe, the The synchronization signal sent by the synchronization source base station.

The receiving module 11 is specifically configured to obtain the synchronization configuration information of the synchronization source base station through wired transmission or air interface monitoring.

It should be noted that the device described in Embodiment 3 of the present invention may be the function of the synchronization source base station described in Embodiment 1 of the present invention and Embodiment 2 of the present invention, and may be implemented by hardware or by software. There is no limit here.

Embodiment four:

As shown in FIG. 4 , it is a schematic structural diagram of an inter-base station synchronization device provided by Embodiment 4 of the present invention. Embodiment 4 of the present invention is an invention under the same inventive concept as Embodiment 1 to Embodiment 3 of the present invention. Applied in the Long Term Evolution Time Division Duplex LTE TDD system, the device includes: a determining module 21 and a sending module 22, wherein:

The determination module 21 is configured to determine synchronization configuration information, wherein the synchronization configuration information includes guard interval GP information for special subframes carrying synchronization signals;

The sending module 22 is configured to use the GP information of the special subframe used to carry the synchronization signal included in the synchronization configuration information to send the synchronization signal to the base station to be synchronized.

The determination module 21 is specifically configured to acquire the correspondence between preset synchronization level information and synchronization configuration information; determine its own synchronization configuration information according to its own synchronization level and the correspondence.

The determining module 21 is specifically configured to receive the corresponding relationship between the synchronization level information and the synchronization configuration information sent by the core network; determine its own synchronization configuration information according to its own synchronization level and the corresponding relationship.

The GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal;

Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes.

The GP information of the special subframe also includes information about the OFDM symbol occupied by the synchronization signal used to carry the synchronization source base station;

The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe.

The sending module 22 is specifically configured to send a synchronization signal on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal contained in the obtained synchronization configuration information .

It should be noted that the device described in Embodiment 4 of the present invention may be the function of the base station to be synchronized described in Embodiment 1 of the present invention and Embodiment 2 of the present invention, and may be implemented by hardware or by software. There is no limit here.

In addition, the modules described in the third embodiment of the present invention and the fourth embodiment of the present invention can also appear in a base station. In practical applications, a base station can not only serve as the synchronization source base station of the lower-level base station, but also become the synchronization source base station of the upper-level base station. The base station to be synchronized is not limited here.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, devices (devices), or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely 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, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (26)

1. A method for synchronizing between base stations, characterized in that it is applied in the Long Term Evolution Time Division Duplex LTE TDD system, comprising: Obtaining synchronization configuration information of the synchronization source base station, wherein the synchronization configuration information includes guard interval GP information of a special subframe used to carry the synchronization signal of the synchronization source base station; According to the GP information of the special subframe included in the synchronization configuration information, receive a synchronization signal sent by the synchronization source base station, and use the received synchronization signal to maintain a clock with the synchronization source base station Synchronize. 2. The method according to claim 1, wherein said acquiring the synchronization configuration information of the synchronization source base station comprises: receiving the synchronization level information of the base station sent by the core network or the synchronization source base station; The synchronization configuration information of the synchronization source base station is determined according to the preset correspondence between the synchronization level information and the synchronization configuration information. 3. The method according to claim 1, wherein said acquiring the synchronization configuration information of the synchronization source base station comprises: The synchronization level information of the base station and the synchronization configuration information corresponding to the synchronization level information sent by the core network or the synchronization source base station are received. 4. The method according to any one of claims 1 to 3, wherein the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal; Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes. 5. The method according to claim 4, characterized in that, the GP information of the special subframe also includes Orthogonal Frequency Division Multiplexing (OFDM) symbol information occupied by the synchronization signal used to carry the synchronization source base station; The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe. 6. The method according to claim 4, wherein, according to the GP information of the special subframe included in the synchronization configuration information, receiving the synchronization signal sent by the synchronization source base station comprises: Receive the synchronization signal sent by the synchronization source base station on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the acquired synchronization configuration information. 7. The method according to claim 1 or 6, wherein obtaining the synchronization configuration information of the synchronization source base station comprises: Obtain the synchronization configuration information of the synchronization source base station through wired transmission or air interface monitoring. 8. A method for synchronization between base stations, characterized in that it is applied in the Long Term Evolution Time Division Duplex LTE TDD system, comprising: determining synchronization configuration information, wherein the synchronization configuration information includes guard interval GP information of special subframes used to carry synchronization signals; The synchronization signal is sent to the base station to be synchronized by using the GP information of the special subframe carrying the synchronization signal included in the synchronization configuration information. 9. The method according to claim 8, wherein said determining the synchronization configuration information comprises: Obtain the correspondence between preset synchronization level information and synchronization configuration information; According to its own synchronization level and the corresponding relationship, determine its own synchronization configuration information. 10. The method according to claim 8, wherein said determining the synchronization configuration information comprises: Receive the correspondence between the synchronization level information sent by the core network and the synchronization configuration information; Determine its own synchronization configuration information according to its own synchronization level and the corresponding relationship. 11. The method according to any one of claims 8-10, wherein the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal; Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes. 12. The method according to claim 11, characterized in that, the GP information of the special subframe also includes Orthogonal Frequency Division Multiplexing (OFDM) symbol information used to carry the synchronization signal occupied by the synchronization source base station; The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe. 13. The method according to claim 12, wherein the sending the synchronization signal to the base station to be synchronized by using the GP information of the special subframe carrying the synchronization signal contained in the synchronization configuration information comprises: The synchronization signal is sent on the GP of the special subframe according to the period information and/or offset information of the special subframe carrying the synchronization signal included in the acquired synchronization configuration information. 14. A device for synchronization between base stations, characterized in that it is applied in a Long Term Evolution Time Division Duplex LTE TDD system, comprising: A receiving module, configured to obtain synchronization configuration information of a synchronization source base station, wherein the synchronization configuration information includes guard interval GP information of a special subframe used to carry a synchronization signal of the synchronization source base station; a synchronization module, configured to receive a synchronization signal sent by the synchronization source base station according to the GP information of the special subframe contained in the synchronization configuration information, and use the received synchronization signal to maintain the synchronization with the synchronization source Clock synchronization between base stations. 15. The apparatus of claim 14, wherein The receiving module is specifically configured to receive the synchronization level information of the base station sent by the core network or the synchronization source base station; determine the synchronization level information of the synchronization source base station according to the preset correspondence between synchronization level information and synchronization configuration information Synchronize configuration information. 16. The device according to claim 14, wherein the receiving module is specifically configured to receive the synchronization level information of the base station sent by the core network or the synchronization source base station and the synchronization configuration information corresponding to the synchronization level information. 17. The device according to any one of claims 14-16, wherein the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal; Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes. 18. The device according to claim 17, wherein the GP information of the special subframe further includes information about an OFDM symbol occupied by a synchronization signal of the synchronization source base station; The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe. 19. The device according to claim 17, wherein the synchronization module is specifically configured to, according to the period information and/or offset of the special subframe carrying the synchronization signal included in the obtained synchronization configuration information Receive the synchronization signal sent by the synchronization source base station on the GP of the special subframe. 20. Apparatus as claimed in claim 14 or 19, characterized in that, The receiving module is specifically configured to obtain the synchronization configuration information of the synchronization source base station through wired transmission or air interface monitoring. 21. A device for synchronization between base stations, characterized in that it is applied in a Long Term Evolution Time Division Duplex LTE TDD system, comprising: A determining module, configured to determine synchronization configuration information, wherein the synchronization configuration information includes guard interval GP information of special subframes used to carry synchronization signals; A sending module, configured to send the synchronization signal to the base station to be synchronized by using the GP information of the special subframe used to carry the synchronization signal included in the synchronization configuration information. 22. The apparatus of claim 21, wherein The determination module is specifically configured to acquire the correspondence between preset synchronization level information and synchronization configuration information; determine its own synchronization configuration information according to its own synchronization level and the correspondence. 23. The apparatus of claim 21, wherein The determining module is specifically configured to receive the correspondence between the synchronization level information and the synchronization configuration information sent by the core network; determine its own synchronization configuration information according to its own synchronization level and the correspondence. 24. The device according to any one of claims 21 to 23, wherein the GP information of the special subframe includes period information and/or offset information of the special subframe used to carry the synchronization signal; Base stations of different synchronization levels use different GPs for special subframes carrying synchronization signals, where different GPs are determined according to period information and/or offset information of special subframes. 25. The device according to claim 24, wherein the GP information of the special subframe further includes information of an OFDM symbol occupied by a synchronization signal of the synchronization source base station; The base stations of different synchronization levels use the same GP for special subframes carrying synchronization signals, and base stations of different synchronization levels use different OFDM symbol information for the special subframes carrying synchronization signals, wherein the same GP is based on determined by period information and/or offset information of a special subframe. 26. The device according to claim 25, wherein the sending module is specifically configured to follow the period information and/or offset of the special subframe carrying the synchronization signal contained in the acquired synchronization configuration information information, and send a synchronization signal on the GP of the special subframe.