CN105122908A - Synchronization method, base station, and user equipment - Google Patents
Synchronization method, base station, and user equipment Download PDFInfo
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- CN105122908A CN105122908A CN201480000802.0A CN201480000802A CN105122908A CN 105122908 A CN105122908 A CN 105122908A CN 201480000802 A CN201480000802 A CN 201480000802A CN 105122908 A CN105122908 A CN 105122908A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W56/001—Synchronization between nodes
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Abstract
Provided in embodiments of the present invention are a synchronization method, base station, and user equipment. The method comprises: an unlicensed spectrum base station completes radio channel preemption of an unlicensed spectrum at a first time node (101); the unlicensed spectrum base station determines a second time node, where the second time node is a subframe boundary at where the base station begins to transmit valid subframes (102); the unlicensed spectrum base station intensively transmits a synchronization signal during a first time period between the first time node and the second time node to facilitate a user equipment (UE) in completing uplink synchronization in the first time period (103); and, the base station begins to transmit the valid subframes at the second time node (104). By means of intensive transmission of a synchronization signal by an unlicensed spectrum base station when a radio channel of an unlicensed spectrum is preempted, the embodiments of the present invention allow a UE to complete synchronization with an unlicensed spectrum cell or base station, thus allowing the utilization of an unlicensed spectrum for data transmission to begin as early as possible, and increasing the utilization rate of unlicensed spectrum resources.
Description
It is a kind of to realize the synchronous method of clock and station technology field between base station
The present invention relates to communication technical field, and in particular to a kind of to realize the synchronous method of clock and base station between base station.Background technology
With the fast development of the communication technology, people are also gradually increasing the demand of data service traffics, in order to tackle demand of the people to data service traffics, in traditional macro base station cellular network（Following cylinder claims " macrocellular net "）On the basis of, substantial amounts of femto cell is generally densely deployed the hot zones of some indoor or outdoors.Due to coverage is small, the low feature of transmission power, femto cell can provide the data transport service of high-speed, and the data service of macrocellular net can be shunted, reduce the cost of arranging net of operator, in order to ensure between macro base station and femto cell and each femto cell between normal data transfer, need to realize that clock is synchronous between macro base station and femto cell and between each femto cell.Number so that the synchronous base station of unrealized clock realizes that clock is synchronous, which results in certain network overhead, and it is unfavorable for the net synchronization capability of whole macrocellular net.The content of the invention
The synchronous method station of clock between base station is realized the embodiment of the invention discloses a kind of, for reducing the expense of macrocellular net and ensure that the net synchronization capability of macrocellular net.
First aspect of the embodiment of the present invention discloses a kind of base station, including：
Receiving module, the synchronizing signal for receiving source base station transmission, the source base station includes at least one and has realized the synchronous source base station of clock；
Selecting module, for selecting in the synchronizing signal, one of synchronizing signal is as the first synchronous letter clock synchronization module, for realizing that the clock of the first source base station with sending first synchronizing signal is synchronous according to first synchronizing signal；
Determining module, the synchronization levels for determining the base station according to the synchronization levels of first source base station；
Judge module, for judging whether the base station meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the base station；
First sending module, for when the judge module determines that the base station meets the condition for sending the second synchronizing signal, second synchronizing signal is sent, so that the base station for receiving second synchronizing signal is synchronous with the clock of the base station according to second synchronizing signal realization received.
In the first possible implementation of first aspect of the embodiment of the present invention, the base station also includes：Second sending module, the request for sending the synchronization levels for obtaining first source base station to first source base station；
The receiving module, is additionally operable to receive the synchronization levels for first source base station that first source base station is sent.
With reference to the first possible implementation of first aspect of the embodiment of the present invention or first aspect of the embodiment of the present invention, in second of possible implementation of first aspect of the embodiment of the present invention, the judge module is specifically for judging whether the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, if the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, it is determined that the base station meets the condition for sending the second synchronizing signal.
With reference to second of possible implementation of first aspect of the embodiment of the present invention, in the third possible implementation of first aspect of the embodiment of the present invention, first sending module includes selection submodule and sending submodule, wherein：
The selection submodule, for selecting synchronizing signal resource pool corresponding with the synchronization levels of the base station according to the synchronization levels of the base station, the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal, and the selection synchronizing signal resource corresponding with the base station from the synchronizing signal resource pool；The sending submodule, for sending second synchronizing signal in synchronizing signal resource corresponding with the base station.
Second aspect of the embodiment of the present invention discloses storage batch processing code in a kind of base station, including memory and processor, the memory, and the processor is used to call the program code stored in the memory, for performing following operation：
The synchronizing signal that source base station is sent is received, the source base station includes at least one and realized clock synchronization
Source base station；
One of synchronizing signal is selected in the synchronizing signal as the first synchronizing signal；
Realized according to first synchronizing signal synchronous with the clock of the first source base station of transmission first synchronizing signal；
The synchronization levels of the base station are determined according to the synchronization levels of first source base station；
Judge whether the base station meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the base station；
If it is determined that the base station meets the condition for sending the second synchronizing signal, then second synchronizing signal is sent, so that the base station for receiving second synchronizing signal is synchronous with the clock of the base station according to second synchronizing signal realization received.
In the first possible implementation of second aspect of the embodiment of the present invention, the processor determines before the synchronization levels of the base station that the processor calls the program code stored in the memory also to perform following operation according to the synchronization levels of first source base station：
The request of the synchronization levels for obtaining first source base station is sent to first source base station；Receive the synchronization levels for first source base station that first source base station is sent.
With reference to the first possible implementation of second aspect of the embodiment of the present invention or second aspect of the embodiment of the present invention, in second of possible implementation of second aspect of the embodiment of the present invention, the processor judges that the mode whether base station meets the condition for sending the second synchronizing signal is specially according to the synchronization levels of the base station：
Judge whether the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, if the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, it is determined that the base station meets the condition for sending the second synchronizing signal.
With reference to second of possible implementation of second aspect of the embodiment of the present invention, in the third possible implementation of second aspect of the embodiment of the present invention, the mode that the processor sends second synchronizing signal is specially：
Synchronizing signal resource pool corresponding with the synchronization levels of the base station is selected according to the synchronization levels of the base station, the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；
Synchronizing signal resource corresponding with the base station is selected from the synchronizing signal resource pool；Second synchronizing signal is sent in synchronizing signal resource corresponding with the base station.
The third aspect of the embodiment of the present invention disclose it is a kind of realize the synchronous method of clock between base station, including：Target BS receives the synchronizing signal that source base station is sent, and the source base station includes at least one and realized the synchronous source base station of clock；
The target BS selects one of synchronizing signal in the synchronizing signal to be used as the first synchronizing signal；The target BS realizes that the clock of the first source base station with sending first synchronizing signal is synchronous according to first synchronizing signal；
The target BS determines the synchronization levels of the target BS according to the synchronization levels of first source base station；
The target BS judges whether the target BS meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the target BS；
If it is determined that the target BS meets the condition for sending the second synchronizing signal, then the target BS sends second synchronizing signal, so that the base station for receiving second synchronizing signal is synchronous with the clock of the target BS according to second synchronizing signal realization received.
In the first possible implementation of the third aspect of the embodiment of the present invention, the target BS determines before the synchronization levels of the target BS that methods described also includes according to the synchronization levels of first source base station：
The target BS sends the request of the synchronization levels for obtaining first source base station to first source base station；
The target BS receives the synchronization levels for first source base station that first source base station is sent.With reference to the first possible implementation of the third aspect of the embodiment of the present invention and the third aspect of the embodiment of the present invention, in second of possible implementation of the third aspect of the embodiment of the present invention, the target BS according to the synchronization levels of the target BS judge the target BS whether meet send the second synchronizing signal condition include：
The target BS judges whether the synchronization levels of the target BS are less than or equal to the synchronization levels pre-set, if the synchronization levels of the target BS are less than or equal to the synchronization levels pre-set, it is determined that the target BS meets the condition for sending the second synchronizing signal.
With reference to second of possible implementation of the third aspect of the embodiment of the present invention, in the third possible implementation of the third aspect of the embodiment of the present invention, the target BS, which sends second synchronizing signal, to be included：
The target BS selects synchronizing signal resource pool corresponding with the synchronization levels of the target BS according to the synchronization levels of the target BS, and the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；
The target BS selects synchronizing signal resource corresponding with the target BS from the synchronizing signal resource pool；
The target BS sends second synchronizing signal in synchronizing signal resource corresponding with the target BS.
In the embodiment of the present invention, target BS receives the synchronizing signal that source base station is sent, and one of synchronizing signal is selected as the first synchronizing signal, then realized according to the first synchronizing signal synchronous with the clock of the first source base station of the first synchronizing signal of transmission, synchronization levels further according to the first source base station determine the synchronization levels of target BS, judged whether to meet the condition for sending the second synchronizing signal according to the synchronization levels of target BS afterwards, if it is determined that meeting the condition for sending the second synchronizing signal, then send the second synchronizing signal, so that the base station for receiving the second synchronizing signal is synchronous with the clock of target BS according to the second synchronizing signal realization received.The implementation embodiment of the present invention can stand to be decided whether to send synchronizing signal according to its synchronization levels, is reduced the expense of macrocellular net and be ensure that the net synchronization capability of whole macrocellular net.Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, cylinder will be made to the required accompanying drawing used in embodiment below singly to introduce, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of base station disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of another base station disclosed in the embodiment of the present invention；
Fig. 3 is the structural representation of another base station disclosed in the embodiment of the present invention；
Fig. 4 is a kind of schematic flow sheet for realizing the synchronous method of clock between base station disclosed in the embodiment of the present invention；
Fig. 5 is another schematic flow sheet for realizing the synchronous method of clock between base station disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
The synchronous method of clock and base station between base station are realized the embodiment of the invention discloses a kind of, can stand and be decided whether to send synchronizing signal according to its synchronization levels, reduce the expense of macrocellular net and ensure that the net synchronization capability of whole macrocellular net.
Fig. 1 is referred to, Fig. 1 is a kind of structural representation of base station disclosed in the embodiment of the present invention.As shown in figure 1, the base station 100 can include receiving module 101, selecting module 102, clock synchronization module 103, determining module 104, the sending module 106 of judge module 105 and first, wherein：
Receiving module 101 is used for the synchronizing signal for receiving source base station transmission.
In the embodiment of the present invention, source base station can include at least one and realize the synchronous source base station of clock, and source base station can be macro base station or femto cell, and the embodiment of the present invention is not limited.If source base station is macro base station, macro base station can pass through global positioning system（GPS, Global Positioning System) synchronizing information is obtained, and synchronizing signal is sent to base station 100;If source base station is femto cell, femto cell from macro base station or upper level has not realized the synchronizing signal of the synchronous femto cell of clock and realizes that clock is synchronous by receiving, and synchronizing signal is sent to base station 100.
In the embodiment of the present invention, synchronizing signal can be master sync signal, auxiliary synchronous signals, cell specific reference signal, channel state information reference signals, multicast broadcast multimedia service Single Frequency Network reference signal, location reference signals and find reference signal etc., and the embodiment of the present invention is not limited.
Selecting module 102 is used to select in synchronizing signal one of synchronizing signal as the first synchronizing signal.In the embodiment of the present invention, base station 100 can receive the synchronizing signal that multiple source base stations are sent, and one of synchronizing signal is selected in synchronizing signal as the first synchronizing signal, wherein, first synchronizing signal can be that signal intensity exceedes preset signal strength threshold value and synchronization levels in signal intensity most strong synchronizing signal or synchronizing signal in the synchronizing signal that base station 100 is received（Synchronization levels are smaller, and synchronization accuracy is higher）Minimum synchronizing signal, it can also be signal intensity most strong synchronizing signal in the synchronizing signal that the base station for belonging to same operator with base station 100 is sent, the embodiment of the present invention is not limited, and the signal intensity of synchronizing signal can be embodied by the energy or power of synchronizing signal, it can also be obtained by using synchronizing signal measurement
Reference Signal Received Power or Reference Signal Received Quality are embodied, and the embodiment of the present invention is not limited.Clock synchronization module 103 is used to realize that the clock of the first source base station with sending the first synchronizing signal is synchronous according to the first synchronizing signal.
In the embodiment of the present invention, clock can synchronously include time synchronized and Frequency Synchronization, realize that time synchronized can be understood as sending the time deviation of signal in the range of default time threshold between the time deviation and each femto cell of transmission signal between macro base station and femto cell between macro base station and femto cell and between each femto cell；Realize that Frequency Synchronization can be understood as the frequency departure between the frequency departure between macro base station and femto cell and each femto cell in the range of default frequency threshold between macro base station and femto cell and between each femto cell.
Determining module 104 is used for the synchronization levels that base station 100 is determined according to the synchronization levels of the first source base station.In the embodiment of the present invention, synchronization levels can be for representing the synchronous regime of each base station, the base station of each synchronization levels includes at least one base station, for example, assuming that macro base station is obtained after synchronizing information by global positioning system, the synchronization levels for setting macro base station are 0, femto cell 1 is obtained after synchronizing information by macro base station, the synchronization levels of femto cell 1 are 1, femto cell 2 is obtained after synchronizing information by femto cell 1, the synchronization levels of femto cell 2 are 2, by that analogy, if the synchronization levels in macrocellular net are up to that (L is greater than 0 integer to L）, then we the macrocellular net can be referred to as L jump synchronous network system.In the embodiment of the present invention, if not otherwise specified, synchronization levels are smaller, and to represent synchronization accuracy higher.
In the embodiment of the present invention, the synchronization levels of first source base station can be only fitted in the subframe where the first synchronizing signal, and base station 100 can deduce the synchronization levels of the first source base station by the subframe where the first synchronizing signal, and determine the synchronization levels of itself of base station 100 according to the synchronization levels of the first source base station, base station 100 can also send the request of the synchronization levels for obtaining the first source base station to the first source base station, so that the first source base station sends the synchronization levels of the first source base station to base station 100, the embodiment of the present invention is not limited.
For example, if the synchronization levels of the first source base station in the embodiment of the present invention are that (M is greater than the integer equal to 0 to M）, then the synchronization levels of base station 100 are M+l.
Judge module 105 is used to judge whether base station 100 meets the condition of the second synchronizing signal of transmission according to the synchronization levels of base station 100.
As an alternative embodiment, judge module 105 can be specifically for：
Judge whether the synchronization levels of base station 100 are less than or equal to the synchronization levels pre-set, if the synchronization levels of base station 100 are less than or equal to the synchronization levels pre-set, it is determined that base station 100, which is met, sends second synchronously
The condition of signal.
In the embodiment of the present invention, the synchronization levels pre-set can be configured as defined in artificial or by operator, and the synchronization levels pre-set can be backhaul signaling, can also be the high-level signaling of itself of base station 100, the embodiment of the present invention is not limited.For example, if positive integer K is the maximum in synchronization levels as defined in standard/protocol, and synchronization levels are assumed since 0 ing and the synchronization levels that pre-set are T, then the collection of synchronization levels is combined into { 0,1,2 ..., K }, T<K, and synchronization levels do not send synchronizing signal for Κ source base station, the maximum source base station of synchronization levels is not sent in the synchronous letter embodiment of the present invention i.e. as defined in standard/protocol, the synchronization levels pre-set are smaller, the synchronous hop count that the synchronous base station of clock is had been carried out in whole macrocellular net is just smaller, the synchronization accuracy having been carried out between the synchronous base station of clock is higher, because less base station sends synchronizing signal, network overhead in macrocellular net is also smaller, but because the base station for sending synchronizing signal is fewer, this, which may result in some base stations in macrocellular net, can not intercept or receive suitable synchronizing signal, and then result in and can not realize that the number of the synchronous base station of clock increases, this have impact on the net synchronization capability of whole macrocellular net.Therefore, the synchronization levels pre-set need to compromise when setting to be considered, i.e., should ensure that the synchronization accuracy of macrocellular net guarantees to reduce the expense of macrocellular net again when setting synchronization levels.
As an example it is assumed that the synchronization levels pre-set are 5, and the synchronization levels of base station 100 are 3, then can determine that base station 100 meets the condition for sending the second synchronizing signal.
First sending module 106 is used to, when judge module 105 determines that base station 100 meets the condition for sending the second synchronizing signal, send the second synchronizing signal.
As an alternative embodiment, the first sending module 106 can be specifically for：
Synchronizing signal resource pool corresponding with the synchronization levels of base station 100 is selected according to the synchronization levels of base station 100, synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；
Synchronizing signal resource corresponding with base station 100 is selected from synchronizing signal resource pool；
The second synchronizing signal is sent in synchronizing signal resource corresponding with base station 100.
In the embodiment of the present invention, the base station of each synchronization levels can configure a synchronizing signal resource pool, and each synchronizing signal resource pool can include multiple synchronizing signal resources for sending synchronizing signal.Base station 100 first can select synchronizing signal resource pool corresponding with the synchronization levels of base station 100 according to the synchronization levels of base station 100, then further according to the proprietary parameter of base station 100（Such as Base Station Identification Cell ID, remote radio leader
Know RHH ID or global unique identification etc., the embodiment of the present invention is not limited）Synchronizing signal resource corresponding with the parameter of base station 100 is selected to send synchronizing signal from synchronizing signal resource pool corresponding with the synchronization levels of base station 100, be not in thus the problem of base station selected identical synchronizing signal resource of adjacent two sends corresponding synchronizing signal, be conducive to improving the synchronization accuracy between base station.For example, assuming that the Base Station Identification of base station 100 is Ν and the number of synchronizing signal resource in synchronizing signal resource pool corresponding with the synchronization levels of base station 100 is R, then the synchronizing signal resource index in synchronizing signal resource pool corresponding with the synchronization levels of base station 100 is 0,1, R-1, then Ν R is taken the remainder corresponding synchronizing signal resource can serve as send the second synchronizing signal synchronizing signal resource.
In the embodiment of the present invention, when the selection synchronizing signal resource of base station 100 sends the second synchronizing signal, base station 100 can serve as a source base station, other source base stations in macrocellular net just can according to the signal intensity phase reflexive of the second synchronizing signal received its signal intensity for sending signal that determines, the signal intensity for the synchronizing signal that i.e. other source base stations are received in the synchronizing signal resource that base station 100 is selected is stronger, and other source base stations send signal in the synchronizing signal resource that base station 100 is selected（Synchronizing signal or other signals）Signal intensity it is lower, even zero, the embodiment of the present invention is not limited, and can so reduce interference of other signals to the second synchronizing signal, improves synchronization accuracy.
In the embodiment of the present invention, the corresponding synchronizing signal resource pool of each synchronization levels can periodically occur, i.e., in a cycle the corresponding synchronizing signal resource pool of each synchronization levels can according to synchronization levels order（From small to large or from big to small, the embodiment of the present invention is not limited）There is the corresponding synchronizing signal resource pool of all synchronization levels, periodic quantity can be pre-set, and such as 1 second or 10 seconds, the embodiment of the present invention was not limited.The corresponding synchronizing signal resource pool of all synchronization levels can be pre-configured in multicast/multicast single-frequency embodiment of the present invention and not limit, and each corresponding synchronizing signal resource pool of synchronization levels can be concentrated in a subframe or multiple subframes as far as possible, the synchronizing signal resource pool of i.e. one synchronization levels is continuous, the time that base station obtains synchronizing signal resource pool corresponding with the synchronization levels of base station can be so reduced, the spectrum efficiency of base station is effectively improved.
For example, synchronizing signal resource pool can be only fitted in the sub-frame of uplink 2,3,4,7,8,9 of time division duplex or the sub-frame of uplink 1,2,3,6,7,8 of FDD.In a cycle, synchronizing signal resource pool is configured into the sub-frame of uplink 2,3 in time division duplex, 4,7,8, exemplified by 9, synchronization levels are the synchronizing signal resource pool correspondence subframe 2 of 0 base station, and synchronization levels are the synchronizing signal resource pool pair of 1 base station
Answer subframe 3, synchronization levels are the synchronizing signal resource pool correspondence subframe 4 of 2 base station, synchronization levels are the synchronizing signal resource pool correspondence subframe 7 of 3 base station, synchronization levels are the synchronizing signal resource pool correspondence subframe 8 of 4 base station, and synchronization levels are the synchronizing signal resource pool correspondence subframe 9 of 5 base station.One subframe can include multiple synchronizing signal resources, assuming that a subframe can configure 6 synchronizing signal resources, when the number of synchronizing signal resource in the synchronizing signal resource pool of the base station of some synchronization levels is more than 6, then the synchronizing signal resource pool of the base station of the synchronization levels can be only fitted to multiple subframes（Such as 1.5 subframes）In, then when configuring synchronizing signal resource pool, first it can be sorted according to time domain sequence according still further to frequency domain；When the number of synchronizing signal resource in the synchronizing signal resource pool of the base station of some synchronization levels is less than 6, the synchronizing signal resource pool of different synchronization levels can be only fitted in same subframe, but in the synchronizing signal resource pool of different stage the OFDM symbol of synchronizing signal resource or frequency domain biasing it is different.In the embodiment of the present invention, the first sending module 106 sends the second synchronizing signal so that the base station for receiving the second synchronizing signal is synchronous with the clock of base station 100 according to the second synchronizing signal realization received.
Implementing the embodiment of the present invention can make base station be decided whether to send synchronizing signal according to its synchronization levels, and when base station sends synchronizing signal, base station selected synchronizing signal resource corresponding with base station sends synchronizing signal, reduces the expense of macrocellular net and ensure that the net synchronization capability of whole macrocellular net.Fig. 2 is referred to, Fig. 2 is the structural representation of another base station disclosed in the embodiment of the present invention.As shown in Fig. 2, the base station 200 can include receiving module 201, selecting module 202, clock synchronization module 203, the second sending module 204, determining module 205, the sending module 207 of judge module 206 and first, wherein：Receiving module 201 is used for the synchronizing signal for receiving source base station transmission.
In the embodiment of the present invention, source base station can include at least one and realize the synchronous source base station of clock, and source base station can be macro base station or femto cell, and the embodiment of the present invention is not limited.If source base station is macro base station, macro base station can pass through global positioning system（GPS, Global Positioning System) synchronizing information is obtained, and synchronizing signal is sent to base station 200;If source base station is femto cell, femto cell from macro base station or upper level has not realized the synchronizing signal of the synchronous femto cell of clock and realizes that clock is synchronous by receiving, and synchronizing signal is sent to base station 200.
In the embodiment of the present invention, synchronizing signal can be master sync signal, auxiliary synchronous signals, cell specific reference signal, channel state information reference signals, multicast broadcast multimedia service Single Frequency Network reference signal, location reference signals and find reference signal etc., and the embodiment of the present invention is not limited.
Selecting module 202 is used to select in synchronizing signal one of synchronizing signal as the first synchronizing signal.In the embodiment of the present invention, base station 200 can receive the synchronizing signal that multiple source base stations are sent, and select in synchronizing signal one of synchronizing signal as the first synchronizing signal, wherein, the first synchronizing signal can be with
Signal intensity exceedes preset signal strength threshold value and synchronization levels in signal intensity most strong synchronizing signal or synchronizing signal in the synchronizing signals that receive of ^^ stations 200（Synchronization levels are smaller, and synchronization accuracy is higher）Minimum synchronizing signal, it can also be signal intensity most strong synchronizing signal in the synchronizing signal that the base station for belonging to same operator with base station 200 is sent, the embodiment of the present invention is not limited, and the signal intensity of synchronizing signal can be embodied by the energy or power of synchronizing signal, the Reference Signal Received Power or Reference Signal Received Quality that can also be obtained by using synchronizing signal measurement is embodied, and the embodiment of the present invention is not limited.
Clock synchronization module 203 is used to realize that the clock of the first source base station with sending the first synchronizing signal is synchronous according to the first synchronizing signal.
Second sending module 204 is used for the request that the synchronization levels for obtaining the first source base station are sent to the first source base station.
As an alternative embodiment, receiving module 201 is additionally operable to receive the synchronization levels for the first source base station that the first source base station is sent.
Determining module 205 is used for the synchronization levels that base station 200 is determined according to the synchronization levels of the first source base station.For example, if the synchronization levels of the first source base station in the embodiment of the present invention are that (M is greater than the integer equal to 0 to M）, then the synchronization levels of base station 200 are M+l.
Judge module 206 is used to judge whether base station 200 meets the condition of the second synchronizing signal of transmission according to the synchronization levels of base station 200.
As an alternative embodiment, judge module 206 can be specifically for：
Judge whether the synchronization levels of base station 200 are less than or equal to the synchronization levels pre-set, if the synchronization levels of base station 200 are less than or equal to the synchronization levels pre-set, it is determined that base station 200 meets the condition for sending the second synchronizing signal.
First sending module 207 is used to, when judge module 206 determines that base station 200 meets the condition for sending the second synchronizing signal, send the second synchronizing signal.
As an alternative embodiment, the first sending module 207 can include selection submodule 2071 and sending submodule 2072, wherein：
Submodule 2071 is selected to be used to select the synchronization levels with base station 200 according to the synchronization levels of base station 200
Corresponding synchronizing signal resource pool, synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal, and the selection synchronizing signal resource corresponding with base station 200 from synchronizing signal resource pool；
Sending submodule 2072 is used to send in synchronizing signal resource corresponding with base station 200 in the second synchronous letter embodiment of the present invention, and the first sending module 207 sends the second synchronizing signal so that the base station for receiving the second synchronizing signal is synchronous with the clock of base station 200 according to the second synchronizing signal realization received.
Implementing the embodiment of the present invention can make base station be decided whether to send synchronizing signal according to its synchronization levels, and when base station sends synchronizing signal, base station selected synchronizing signal resource corresponding with base station sends synchronizing signal, reduces the expense of macrocellular net and ensure that the net synchronization capability of whole macrocellular net.Fig. 3 is referred to, Fig. 3 is the structural representation of another base station disclosed in the embodiment of the present invention.As shown in Fig. 3, the base station 300 can include memory 301 and processor 302, wherein, batch processing code is stored in memory 301, and processor 302 is used to call the program code stored in memory 301, for performing following operation：
The synchronizing signal that source base station is sent is received, source base station includes at least one and realized the synchronous source base station of clock；
One of synchronizing signal is used as the first synchronizing signal in selection synchronizing signal；
Realized according to the first synchronizing signal synchronous with the clock of the first source base station of the first synchronizing signal of transmission；The synchronization levels of base station 300 are determined according to the synchronization levels of the first source base station；
Judge whether base station 300 meets the condition of the second synchronizing signal of transmission according to the synchronization levels of base station 300；If it is determined that base station 300 meets the condition for sending the second synchronizing signal, then the second synchronizing signal is sent, so that the base station for receiving the second synchronizing signal is synchronous with the clock of base station 300 according to the second synchronizing signal realization received.
In one embodiment, before processor 302 determines the synchronization levels of base station 300 according to the synchronization levels of the first source base station, processor 302 calls the program code stored in memory 301 also to perform following operation：The request of the synchronization levels for obtaining the first source base station is sent to the first source base station；
Receive the synchronization levels of the first source base station of the first source base station transmission.
In one embodiment, processor 302 judges that the mode whether base station 300 meets the condition for sending the second synchronizing signal is specially according to the synchronization levels of base station 300：
Judge whether the synchronization levels of base station 300 are less than or equal to the synchronization levels pre-set, if the synchronization levels of base station 300 are less than or equal to the synchronization levels pre-set, it is determined that base station 300 meets the condition for sending the second synchronizing signal.
In one embodiment, the mode of second synchronizing signal of the transmission of processor 302 is specially：
Synchronizing signal resource pool corresponding with the synchronization levels of base station 300 is selected according to the synchronization levels of base station 300, synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；
Synchronizing signal resource corresponding with base station 300 is selected from synchronizing signal resource pool；
The second synchronizing signal is sent in synchronizing signal resource corresponding with base station 300.
Implementing the embodiment of the present invention can make base station be decided whether to send synchronizing signal according to its synchronization levels, and when base station sends synchronizing signal, base station selected synchronizing signal resource corresponding with base station sends synchronizing signal, reduces the expense of macrocellular net and ensure that the net synchronization capability of whole macrocellular net.Refer to Fig. 4, Fig. 4 is a kind of schematic flow sheet for realizing the synchronous method of clock between base station disclosed in the embodiment of the present invention.As shown in figure 4, this realizes that the synchronous method of clock may comprise steps of between base station：S401, target BS receive the synchronizing signal that source base station is sent.
In the embodiment of the present invention, source base station can include at least one and realize the synchronous source base station of clock, and source base station can be macro base station or femto cell, and the embodiment of the present invention is not limited.If source base station is macro base station, macro base station can pass through global positioning system（GPS, Global Positioning System) synchronizing information is obtained, and synchronizing signal is sent to target BS；If source base station is femto cell, femto cell from macro base station or upper level has not realized the synchronizing signal of the synchronous femto cell of clock and realizes that clock is synchronous by receiving, and synchronizing signal is sent to target BS.
In the embodiment of the present invention, synchronizing signal can be master sync signal, auxiliary synchronous signals, cell specific reference signal, channel state information reference signals, multicast broadcast multimedia service Single Frequency Network reference signal, location reference signals and find reference signal etc., and the embodiment of the present invention is not limited.
One of synchronizing signal is used as the first synchronizing signal in S402, target BS selection synchronizing signal.In the embodiment of the present invention, target BS can receive the synchronizing signal that multiple source base stations are sent, and wherein synchronizing signal is selected in synchronizing signal as the first synchronizing signal, wherein, first synchronizing signal can be that signal intensity exceedes preset signal strength threshold value and synchronization levels in signal intensity most strong synchronizing signal or synchronizing signal in the synchronizing signal that target BS is received（Synchronization levels are smaller, and synchronization accuracy is higher）Most
Small synchronizing signal, it can also be signal intensity most strong synchronizing signal in the synchronizing signal that the base station for belonging to same operator with target BS is sent, the embodiment of the present invention is not limited, and the signal intensity of synchronizing signal can be embodied by the energy or power of synchronizing signal, the Reference Signal Received Power or Reference Signal Received Quality that can also be obtained by using synchronizing signal measurement is embodied, and the embodiment of the present invention is not limited.
5403rd, target BS realizes that the clock of the first source base station with sending the first synchronizing signal is synchronous according to the first synchronizing signal.
In the embodiment of the present invention, clock can synchronously include time synchronized and Frequency Synchronization, realize that time synchronized can be understood as sending the time deviation of signal in the range of default time threshold between the time deviation and each femto cell of transmission signal between macro base station and femto cell between macro base station and femto cell and between each femto cell；Realize that Frequency Synchronization can be understood as the frequency departure between the frequency departure between macro base station and femto cell and each femto cell in the range of default frequency threshold between macro base station and femto cell and between each femto cell.
5404th, target BS determines the synchronization levels of target BS according to the synchronization levels of the first source base station.In the embodiment of the present invention, synchronization levels can be for representing the synchronous regime of each base station, the base station of each synchronization levels includes at least one base station, for example, assuming that macro base station is obtained after synchronizing information by global positioning system, the synchronization levels for setting macro base station are 0, femto cell 1 is obtained after synchronizing information by macro base station, the synchronization levels of femto cell 1 are 1, femto cell 2 is obtained after synchronizing information by femto cell 1, the synchronization levels of femto cell 2 are 2, by that analogy, if the synchronization levels in macrocellular net are up to that (L is greater than 0 integer to L）, then we the macrocellular net can be referred to as L jump synchronous network system.In the embodiment of the present invention, if not otherwise specified, synchronization levels are smaller, and to represent synchronization accuracy higher.
In the embodiment of the present invention, the synchronization levels of first source base station can be only fitted in the subframe where the first synchronizing signal, and target BS can deduce the synchronization levels of the first source base station by the subframe where the first synchronizing signal, and the synchronization levels of target BS itself are determined according to the synchronization levels of the first source base station, target BS can also send the request of the synchronization levels for obtaining the first source base station to the first source base station, so that the first source base station sends the synchronization levels of the first source base station to target BS, the embodiment of the present invention is not limited.
For example, if the synchronization levels of the first source base station in the embodiment of the present invention are that (M is greater than the integer equal to 0 to M）, then the synchronization levels of target BS are M+l.
5405th, target BS judges whether target BS meets the condition of the second synchronizing signal of transmission according to the synchronization levels of target BS.
As an alternative embodiment, target BS judges that the concrete mode whether target BS meets the condition for sending the second synchronizing signal can be according to the synchronization levels of target BS：
Target BS judges whether the synchronization levels of target BS are less than or equal to the synchronization levels pre-set, if the synchronization levels of target BS are less than or equal to the synchronization levels pre-set, it is determined that target BS meets the condition for sending the second synchronizing signal.
In the embodiment of the present invention, the synchronization levels pre-set can be configured as defined in artificial or by operator, and the synchronization levels pre-set can be backhaul signaling, can also be the high-level signaling of target BS itself, the embodiment of the present invention is not limited.For example, if positive integer K is the maximum in synchronization levels as defined in standard/protocol, and synchronization levels are assumed since 0 ing and the synchronization levels that pre-set are T, then the collection of synchronization levels is combined into { 0,1,2 ..., K }, T<K, and synchronization levels do not send synchronizing signal for Κ source base station, the maximum source base station of synchronization levels is not sent in the synchronous letter embodiment of the present invention i.e. as defined in standard/protocol, the synchronization levels pre-set need to compromise when setting to be considered, i.e., should ensure that the synchronization accuracy of macrocellular net guarantees to reduce the expense of macrocellular net again when setting synchronization levels.
As an example it is assumed that the synchronization levels pre-set are 5, and the synchronization levels of target BS are 3, then can determine that target BS meets the condition for sending the second synchronizing signal.
S406, if it is determined that target BS meet send the second synchronizing signal condition, target BS send the second synchronizing signal.
As an alternative embodiment, the concrete mode that target BS sends the second synchronizing signal can be：
Target BS selects synchronizing signal resource pool corresponding with the synchronization levels of target BS according to the synchronization levels of target BS, and synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；Target BS selects synchronizing signal resource corresponding with target BS from synchronizing signal resource pool；Target BS sends the second synchronizing signal in synchronizing signal resource corresponding with target BS.
In the embodiment of the present invention, the base station of each synchronization levels can configure a synchronizing signal resource pool, and each synchronizing signal resource pool can include multiple synchronizing signal resources for sending synchronizing signal.Target BS first can select synchronizing signal resource pool corresponding with the synchronization levels of target BS according to the synchronization levels of target BS, then further according to the proprietary parameter of target BS（Such as Base Station Identification Cell ID, remote radio leader know RHH ID or global unique identification, and the embodiment of the present invention is not limited）From with target BS
Synchronizing signal resource corresponding with the parameter of target BS is selected to send synchronizing signal in the corresponding synchronizing signal resource pool of synchronization levels, be not in thus the problem of base station selected identical synchronizing signal resource of adjacent two sends corresponding synchronizing signal, be conducive to improving the synchronization accuracy between base station.
In the embodiment of the present invention, the corresponding synchronizing signal resource pool of each synchronization levels can periodically occur, i.e., in a cycle the corresponding synchronizing signal resource pool of each synchronization levels can according to synchronization levels order（From small to large or from big to small, the embodiment of the present invention is not limited）There is the corresponding synchronizing signal resource pool of all synchronization levels, periodic quantity can be pre-set, and such as 1 second or 10 seconds, the embodiment of the present invention was not limited.The corresponding synchronizing signal resource pool of all synchronization levels can be pre-configured in multicast/multicast single-frequency embodiment of the present invention and not limit, and each corresponding synchronizing signal resource pool of synchronization levels can be concentrated in a subframe or multiple subframes as far as possible, the synchronizing signal resource pool of i.e. one synchronization levels is continuous, the time that base station obtains synchronizing signal resource pool corresponding with the synchronization levels of base station can be so reduced, the spectrum efficiency of base station is effectively improved.
In the embodiment of the present invention, target BS sends the second synchronizing signal so that the base station for receiving the second synchronizing signal is synchronous with the clock of target BS according to the second synchronizing signal realization received.
In the embodiment of the present invention, target BS receives the synchronizing signal that source base station is sent, and one of synchronizing signal is selected as the first synchronizing signal, then realized according to the first synchronizing signal synchronous with the clock of the first source base station of the first synchronizing signal of transmission, synchronization levels further according to the first source base station determine the synchronization levels of target BS, judged whether to meet the condition for sending the second synchronizing signal according to the synchronization levels of target BS afterwards, if it is determined that meeting the condition for sending the second synchronizing signal, then send the second synchronizing signal, so that the base station for receiving the second synchronizing signal is synchronous with the clock of target BS according to the second synchronizing signal realization received.The implementation embodiment of the present invention can stand to be decided whether to send synchronizing signal according to its synchronization levels, is reduced the expense of macrocellular net and be ensure that the net synchronization capability of whole macrocellular net.Refer to Fig. 5, Fig. 5 is another schematic flow sheet for realizing the synchronous method of clock between base station disclosed in the embodiment of the present invention.As shown in figure 5, this realizes that the synchronous method of clock may comprise steps of between base station：S501, target BS receive the synchronizing signal that source base station is sent.
In the embodiment of the present invention, source base station can include at least one and realize the synchronous source base station of clock, and source base station can be macro base station or femto cell, and the embodiment of the present invention is not limited.If source base station
It is macro base station, then macro base station can pass through global positioning system（GPS, Global Positioning System) synchronizing information is obtained, and synchronizing signal is sent to target BS；If source base station is femto cell, femto cell from macro base station or upper level has not realized the synchronizing signal of the synchronous femto cell of clock and realizes that clock is synchronous by receiving, and synchronizing signal is sent to target BS.
In the embodiment of the present invention, synchronizing signal can be master sync signal, auxiliary synchronous signals, cell specific reference signal, channel state information reference signals, multicast broadcast multimedia service Single Frequency Network reference signal, location reference signals and find reference signal etc., and the embodiment of the present invention is not limited.
5502nd, one of synchronizing signal is used as the first synchronizing signal in target BS selection synchronizing signal.In the embodiment of the present invention, target BS can receive the synchronizing signal that multiple source base stations are sent, and one of synchronizing signal is selected in synchronizing signal as the first synchronizing signal, wherein, first synchronizing signal can be that signal intensity exceedes preset signal strength threshold value and synchronization levels in signal intensity most strong synchronizing signal or synchronizing signal in the synchronizing signal that target BS is received（Synchronization levels are smaller, and synchronization accuracy is higher）Minimum synchronizing signal, it can also be signal intensity most strong synchronizing signal in the synchronizing signal that the base station for belonging to same operator with target BS is sent, the embodiment of the present invention is not limited, and the signal intensity of synchronizing signal can be embodied by the energy or power of synchronizing signal, the Reference Signal Received Power or Reference Signal Received Quality that can also be obtained by using synchronizing signal measurement is embodied, and the embodiment of the present invention is not limited.
5503rd, target BS realizes that the clock of the first source base station with sending the first synchronizing signal is synchronous according to the first synchronizing signal.
In the embodiment of the present invention, clock can synchronously include time synchronized and Frequency Synchronization, realize that time synchronized can be understood as sending the time deviation of signal in the range of default time threshold between the time deviation and each femto cell of transmission signal between macro base station and femto cell between macro base station and femto cell and between each femto cell；Realize that Frequency Synchronization can be understood as the frequency departure between the frequency departure between macro base station and femto cell and each femto cell in the range of default frequency threshold between macro base station and femto cell and between each femto cell.
5504th, target BS sends the request of the synchronization levels for obtaining the first source base station to the first source base station.
5505th, target BS receives the synchronization levels for the first source base station that the first source base station is sent.
5506th, target BS determines the synchronization levels of target BS according to the synchronization levels of the first source base station.For example, if the synchronization levels of the first source base station in the embodiment of the present invention are that (M is greater than M
In 0 integer）, then the synchronization levels of target BS are M+l.
5507th, target BS judges whether target BS meets the condition of the second synchronizing signal of transmission according to the synchronization levels of target BS.
As an alternative embodiment, target BS judges that the concrete mode whether target BS meets the condition for sending the second synchronizing signal can be according to the synchronization levels of target BS：
Target BS judges whether the synchronization levels of target BS are less than or equal to the synchronization levels pre-set, if the synchronization levels of target BS are less than or equal to the synchronization levels pre-set, it is determined that target BS meets the condition for sending the second synchronizing signal.
As an example it is assumed that the synchronization levels pre-set are 5, and the synchronization levels of target BS are 3, then can determine that target BS meets the condition for sending the second synchronizing signal.
5508th, if it is determined that target BS meets the condition for sending the second synchronizing signal, target BS sends the second synchronizing signal.
As an alternative embodiment, the concrete mode that target BS sends the second synchronizing signal can be：
Target BS selects synchronizing signal resource pool corresponding with the synchronization levels of target BS according to the synchronization levels of target BS, and synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；Target BS selects synchronizing signal resource corresponding with target BS from synchronizing signal resource pool；Target BS sends the second synchronizing signal in synchronizing signal resource corresponding with target BS.
In the embodiment of the present invention, the base station of each synchronization levels can configure a synchronizing signal resource pool, and each synchronizing signal resource pool can include multiple synchronizing signal resources for sending synchronizing signal.Target BS first can select synchronizing signal resource pool corresponding with the synchronization levels of target BS according to the synchronization levels of target BS, then further according to the proprietary parameter of target BS（Such as Base Station Identification Cell ID, remote radio leader know RHH ID or global unique identification, and the embodiment of the present invention is not limited）Synchronizing signal resource corresponding with the parameter of target BS is selected to send synchronizing signal from synchronizing signal resource pool corresponding with the synchronization levels of target BS, be not in thus the problem of base station selected identical synchronizing signal resource of adjacent two sends corresponding synchronizing signal, be conducive to improving the synchronization accuracy between base station.
In the embodiment of the present invention, target BS sends the second synchronizing signal so that the base station for receiving the second synchronizing signal is synchronous with the clock of target BS according to the second synchronizing signal realization received.
Implementing the embodiment of the present invention can make base station be decided whether to send synchronizing signal according to its synchronization levels, subtract
Lack the expense of macrocellular net and ensure that the net synchronization capability of whole macrocellular net.
It should be noted that in the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, the part being not described in some embodiment may refer to the associated description of other embodiment.Secondly, those skilled in the art should also know, embodiment described in this description belongs to preferred embodiment, and involved action and the module not necessarily present invention are necessary.
Step in present invention method can be sequentially adjusted, merged and deleted according to actual needs.
Module or submodule in base station of the embodiment of the present invention can be combined, divided and deleted according to actual needs.
Receiving module in base station of the embodiment of the present invention can be radio receiver, first sending module and the second sending module can be wireless transmitting devices, selecting module can be signal handling equipment, clock synchronization module, determining module and judge module can be control devices etc., and the embodiment of the present invention is not limited.
Module described in the embodiment of the present invention or submodule, can pass through universal integrated circuit, such as CPU (Central Processing Unit, central processing unit）, or pass through ASIC (Application Specific Integrated Circuit, application specific integrated circuit）To realize.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, computer program is can be by instruct the hardware of correlation to complete, described program can be stored in computer read/write memory medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic disc, CD, read-only memory（Read-Only Memory, ROM) or random access memory（Random Access Memory, RAM) etc..
The embodiment of the present invention is provided above it is a kind of realize base station the explanation of the synchronous method of clock and base station row above example be only intended to help to understand method and its core concept of the invention；Simultaneously for those of ordinary skill in the art, according to the thought of the present invention, it will change in specific embodiments and applications, in summary, this specification content should not be construed as limiting the invention.
Claims (1)
- Claim1st, a kind of base station, it is characterised in that including：Receiving module, the synchronizing signal for receiving source base station transmission, the source base station includes at least one and has realized the synchronous source base station of clock；Selecting module, for selecting in the synchronizing signal, one of synchronizing signal is as the first synchronous letter clock synchronization module, for realizing that the clock of the first source base station with sending first synchronizing signal is synchronous according to first synchronizing signal；Determining module, the synchronization levels for determining the base station according to the synchronization levels of first source base station；Judge module, for judging whether the base station meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the base station；First sending module, for when the judge module determines that the base station meets the condition for sending the second synchronizing signal, second synchronizing signal is sent, so that the base station for receiving second synchronizing signal is synchronous with the clock of the base station according to second synchronizing signal realization received.2nd, base station according to claim 1, it is characterised in that the base station also includes：Second sending module, the request for sending the synchronization levels for obtaining first source base station to first source base station；The receiving module, is additionally operable to receive the synchronization levels for first source base station that first source base station is sent.3rd, base station according to claim 1 or 2, it is characterized in that, the judge module is specifically for judging whether the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, if the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, it is determined that the base station meets the condition for sending the second synchronizing signal.4th, base station according to claim 3, it is characterised in that first sending module includes selection submodule and sending submodule, wherein： The selection submodule, for selecting synchronizing signal resource pool corresponding with the synchronization levels of the base station according to the synchronization levels of the base station, the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal, and the selection synchronizing signal resource corresponding with the base station from the synchronizing signal resource pool；The sending submodule, for sending second synchronizing signal in synchronizing signal resource corresponding with the base station.5th, a kind of base station, including memory and processor, it is characterised in that batch processing code is stored in the memory, and the processor is used to call the program code stored in the memory, for performing following operation：The synchronizing signal that source base station is sent is received, the source base station includes at least one and realized the synchronous source base station of clock；One of synchronizing signal is selected in the synchronizing signal as the first synchronizing signal；Realized according to first synchronizing signal synchronous with the clock of the first source base station of transmission first synchronizing signal；The synchronization levels of the base station are determined according to the synchronization levels of first source base station；Judge whether the base station meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the base station；If it is determined that the base station meets the condition for sending the second synchronizing signal, then second synchronizing signal is sent, so that the base station for receiving second synchronizing signal is synchronous with the clock of the base station according to second synchronizing signal realization received.6th, base station according to claim 5, it is characterized in that, the processor determines before the synchronization levels of the base station that the processor calls the program code stored in the memory also to perform following operation according to the synchronization levels of first source base station：The request of the synchronization levels for obtaining first source base station is sent to first source base station；Receive the synchronization levels for first source base station that first source base station is sent.7th, the base station according to claim 5 or 6, it is characterised in that the processor judges that the mode whether base station meets the condition for sending the second synchronizing signal is specially according to the synchronization levels of the base station： Judge whether the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, if the synchronization levels of the base station are less than or equal to the synchronization levels pre-set, it is determined that the base station meets the condition for sending the second synchronizing signal.8th, base station according to claim 7, it is characterised in that the mode that the processor sends second synchronizing signal is specially：Synchronizing signal resource pool corresponding with the synchronization levels of the base station is selected according to the synchronization levels of the base station, the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；Synchronizing signal resource corresponding with the base station is selected from the synchronizing signal resource pool；Second synchronizing signal is sent in synchronizing signal resource corresponding with the base station.9th, it is a kind of to realize the synchronous method of clock between base station, it is characterised in that including：Target BS receives the synchronizing signal that source base station is sent, and the source base station includes at least one and realized the synchronous source base station of clock；The target BS selects one of synchronizing signal in the synchronizing signal to be used as the first synchronizing signal；The target BS realizes that the clock of the first source base station with sending first synchronizing signal is synchronous according to first synchronizing signal；The target BS determines the synchronization levels of the target BS according to the synchronization levels of first source base station；The target BS judges whether the target BS meets the condition of the second synchronizing signal of transmission according to the synchronization levels of the target BS；If it is determined that the target BS meets the condition for sending the second synchronizing signal, then the target BS sends second synchronizing signal, so that the base station for receiving second synchronizing signal is synchronous with the clock of the target BS according to second synchronizing signal realization received.10th, method according to claim 9, it is characterised in that the target BS determines before the synchronization levels of the target BS that methods described also includes according to the synchronization levels of first source base station：The target BS sends the request of the synchronization levels for obtaining first source base station to first source base station； The target BS receives the synchronization levels for first source base station that first source base station is sent.11st, the method according to claim 9 or 10, it is characterised in that the target BS according to the synchronization levels of the target BS judge the target BS whether meet send the second synchronizing signal condition include：The target BS judges whether the synchronization levels of the target BS are less than or equal to the synchronization levels pre-set, if the synchronization levels of the target BS are less than or equal to the synchronization levels pre-set, it is determined that the target BS meets the condition for sending the second synchronizing signal.12nd, method according to claim 11, it is characterised in that the target BS, which sends second synchronizing signal, to be included：The target BS selects synchronizing signal resource pool corresponding with the synchronization levels of the target BS according to the synchronization levels of the target BS, and the synchronizing signal resource pool includes the synchronizing signal resource for being used to send synchronizing signal；The target BS selects synchronizing signal resource corresponding with the target BS from the synchronizing signal resource pool；The target BS sends second synchronizing signal in synchronizing signal resource corresponding with the target BS.
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| CN102577547A (en) * | 2009-10-30 | 2012-07-11 | 诺基亚西门子通信公司 | HeNB blind detection for hierarchy configuration |
| CN103458494A (en) * | 2012-05-29 | 2013-12-18 | 电信科学技术研究院 | Method and equipment for synchronizing base stations |
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