WO2015139313A1 - 一种实现基站间时钟同步的方法及基站 - Google Patents

一种实现基站间时钟同步的方法及基站 Download PDF

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Publication number
WO2015139313A1
WO2015139313A1 PCT/CN2014/073888 CN2014073888W WO2015139313A1 WO 2015139313 A1 WO2015139313 A1 WO 2015139313A1 CN 2014073888 W CN2014073888 W CN 2014073888W WO 2015139313 A1 WO2015139313 A1 WO 2015139313A1
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WIPO (PCT)
Prior art keywords
base station
synchronization
synchronization signal
level
target base
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PCT/CN2014/073888
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English (en)
French (fr)
Inventor
吕永霞
范霄安
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/073888 priority Critical patent/WO2015139313A1/zh
Priority to CN201480000802.0A priority patent/CN105122908A/zh
Publication of WO2015139313A1 publication Critical patent/WO2015139313A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a base station for implementing clock synchronization between base stations. Background technique
  • macro cellular network A large number of micro base stations are densely deployed in some indoor or outdoor hotspots. Due to its small coverage and low transmission power, the micro base station can provide high-speed data transmission services and can offload the data services of the macro-cellular network, reducing the cost of the network for operators, in order to ensure the macro base station and the micro-base.
  • Normal data transmission between base stations and each micro base station, clock synchronization between the macro base station and the micro base station and between the various micro base stations is required. The number is such that the base station that does not implement clock synchronization implements clock synchronization, which causes a certain network overhead and is not conducive to the synchronization performance of the entire macro cellular network. Summary of the invention
  • the embodiment of the invention discloses a method for realizing clock synchronization between base stations, which is used for reducing the overhead of the macro cellular network and ensuring the synchronization performance of the macro cellular network.
  • a first aspect of the embodiment of the present invention discloses a base station, including:
  • a receiving module configured to receive a synchronization signal sent by the source base station, where the source base station includes at least one source base station that has achieved clock synchronization;
  • a selection module configured to select one of the synchronization signals as a first synchronization signal clock synchronization module, configured to implement clock synchronization with the first source base station that transmits the first synchronization signal according to the first synchronization signal ;
  • a determining module configured to determine a synchronization level of the base station according to a synchronization level of the first source base station;
  • a determining module configured to determine, according to a synchronization level of the base station, whether the base station satisfies a condition for transmitting a second synchronization signal
  • a first sending module configured to: when the determining module determines that the base station meets a condition for transmitting a second synchronization signal, send the second synchronization signal, so that the base station that receives the second synchronization signal is received according to the received
  • the second synchronization signal is synchronized with a clock of the base station.
  • the base station further includes: a second sending module, configured to send, to the first source base station, a synchronization for acquiring the first source base station Level request;
  • the receiving module is further configured to receive a synchronization level of the first source base station sent by the first source base station.
  • the determining module is specifically used to Determining whether the synchronization level of the base station is less than or equal to a preset synchronization level. If the synchronization level of the base station is less than or equal to the preset synchronization level, determining that the base station satisfies a condition for transmitting a second synchronization signal.
  • the first sending module includes a selecting submodule and a sending submodule, in a third possible implementation manner of the first aspect of the embodiment, among them:
  • the selection submodule is configured to select, according to a synchronization level of the base station, a synchronization signal resource pool corresponding to a synchronization level of the base station, where the synchronization signal resource pool includes a synchronization signal resource for transmitting a synchronization signal, and The synchronization signal resource corresponding to the base station is selected in the synchronization signal resource pool; the sending submodule is configured to send the second synchronization signal on a synchronization signal resource corresponding to the base station.
  • a second aspect of the embodiments of the present invention discloses a base station, including a memory and a processor, where the memory stores a set of program codes, and the processor is configured to invoke program code stored in the memory, to perform the following operations. :
  • Source base station Receiving a synchronization signal sent by the source base station, where the source base station includes at least one implemented clock synchronization Source base station
  • the processor calls the memory before determining, by the processor, the synchronization level of the base station according to the synchronization level of the first source base station.
  • the stored program code also does the following:
  • the manner in which the synchronization level of the base station determines whether the base station satisfies the condition for transmitting the second synchronization signal is specifically:
  • the manner in which the processor sends the second synchronization signal is specifically :
  • a synchronization signal resource pool corresponding to a synchronization level of the base station, where the synchronization signal resource pool includes a synchronization signal resource for transmitting a synchronization signal;
  • a third aspect of the embodiments of the present invention discloses a method for implementing clock synchronization between base stations, including: receiving, by a target base station, a synchronization signal sent by a source base station, where the source base station includes at least one source base station that has achieved clock synchronization;
  • the target base station selects one of the synchronization signals as the first synchronization signal; the target base station implements clock synchronization with the first source base station that transmits the first synchronization signal according to the first synchronization signal;
  • the target base station If it is determined that the target base station satisfies the condition for transmitting the second synchronization signal, the target base station sends the second synchronization signal, so that the base station that receives the second synchronization signal is configured according to the received second synchronization signal. A clock synchronization with the target base station is achieved.
  • the method before the determining, by the target base station, the synchronization level of the target base station according to the synchronization level of the first source base station, the method further includes:
  • the synchronization level of the target base station determines whether the target base station satisfies the condition for transmitting the second synchronization signal, including:
  • the condition of the signal The condition of the signal.
  • the sending, by the target base station, the second synchronization signal includes: The target base station selects a synchronization signal resource pool corresponding to a synchronization level of the target base station according to a synchronization level of the target base station, where the synchronization signal resource pool includes a synchronization signal resource for transmitting a synchronization signal;
  • the target base station selects a synchronization signal resource corresponding to the target base station from the synchronization signal resource pool;
  • the target base station transmits the second synchronization signal on a synchronization signal resource corresponding to the target base station.
  • the target base station receives the synchronization signal sent by the source base station, and selects one of the synchronization signals as the first synchronization signal, and then implements clock synchronization with the first source base station that sends the first synchronization signal according to the first synchronization signal.
  • Embodiments of the present invention can determine whether to transmit a synchronization signal according to its synchronization level, reduce the overhead of the macro cellular network, and ensure the synchronization performance of the entire macro cellular network.
  • FIG. 1 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of still another base station according to an embodiment of the present invention.
  • FIG. 4 is a schematic flow chart of a method for implementing clock synchronization between base stations according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart diagram of another method for implementing clock synchronization between base stations according to an embodiment of the present invention. detailed description
  • the embodiment of the invention discloses a method for realizing clock synchronization between base stations and a base station, which can determine whether to send a synchronization signal according to its synchronization level, which reduces the overhead of the macro cellular network and ensures the synchronization performance of the entire macro cellular network.
  • FIG. 1 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station 100 can include a receiving module 101, a selecting module 102, a clock synchronization module 103, a determining module 104, a determining module 105, and a first sending module 106, where:
  • the receiving module 101 is configured to receive a synchronization signal sent by the source base station.
  • the source base station may include at least one source base station that has achieved clock synchronization, and the source base station may be a macro base station or a micro base station, which is not limited in the embodiment of the present invention.
  • the macro base station may acquire synchronization information through a Global Positioning System (GPS) and transmit the synchronization signal to the base station 100;
  • GPS Global Positioning System
  • the micro base station receives the macro base station by receiving The synchronization signal of the micro base station that has achieved clock synchronization at the previous level is used to implement clock synchronization, and the synchronization signal is transmitted to the base station 100.
  • the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, a cell-specific reference signal, a channel state information reference signal, a multimedia broadcast multicast service single frequency network reference signal, a positioning reference signal, and a discovery reference signal, etc.
  • the embodiments of the invention are not limited.
  • the selection module 102 is configured to select one of the synchronization signals as the first synchronization signal.
  • the base station 100 may receive the synchronization signal sent by the multiple source base stations, and select one of the synchronization signals as the first synchronization signal, where the first synchronization signal may be the synchronization signal received by the base station 100.
  • the synchronization signal with the strongest signal strength may also be the synchronization signal whose signal strength exceeds the preset signal strength threshold and the synchronization level (the smaller the synchronization level is, the higher the synchronization precision is), or may be the same as the base station 100.
  • the synchronization signal with the strongest signal strength in the synchronization signal sent by the base station of the operator is not limited in the embodiment of the present invention, and the signal strength of the synchronization signal may be reflected by the energy or power of the synchronization signal, or may be measured by using the synchronization signal.
  • the reference signal receiving power or the reference signal receiving quality is embodied, which is not limited in the embodiment of the present invention.
  • the clock synchronization module 103 is configured to implement clock synchronization with the first source base station that transmits the first synchronization signal according to the first synchronization signal.
  • clock synchronization may include time synchronization and frequency synchronization, and time synchronization between the macro base station and the micro base station and between the micro base stations may be understood as time deviation of signals transmitted between the macro base station and the micro base station, and each micro The time deviation of the signal transmitted between the base stations is within a preset time threshold; the frequency synchronization between the macro base station and the micro base station and between the micro base stations can be understood as the frequency deviation between the macro base station and the micro base station and the respective micro base stations. The frequency deviation between them is within a preset frequency threshold range.
  • the determining module 104 is configured to determine the synchronization level of the base station 100 according to the synchronization level of the first source base station.
  • the synchronization level may be used to indicate the synchronization status of each base station, and the base station of each synchronization level includes at least one base station.
  • the macro base station acquires synchronization information through the global positioning system
  • the macro base station is set.
  • the synchronization level is 0.
  • the micro base station 1 obtains the synchronization information by the macro base station
  • the synchronization level of the micro base station 1 is 1.
  • the micro base station 2 obtains the synchronization information through the micro base station 1, the synchronization level of the micro base station 2 is 2, and so on.
  • the synchronization level in the macro cellular network is at most L (L is an integer greater than 0), we can refer to the macro cellular network as an L-hop synchronization network system.
  • L is an integer greater than 0
  • the synchronization level of the first source base station may be configured in a subframe in which the first synchronization signal is located, and the base station 100 may infer the synchronization level of the first source base station by using the subframe in which the first synchronization signal is located, and Determining the synchronization level of the base station 100 according to the synchronization level of the first source base station, the base station 100 may further send a request for acquiring the synchronization level of the first source base station to the first source base station, so that the first source base station sends the base station 100 to the base station 100.
  • the synchronization level of the first source base station is not limited in the embodiment of the present invention.
  • the synchronization level of the first source base station in the embodiment of the present invention is M (M is an integer greater than 0), the synchronization level of the base station 100 is M+1.
  • the determining module 105 is configured to determine, according to the synchronization level of the base station 100, whether the base station 100 satisfies the condition for transmitting the second synchronization signal.
  • the determining module 105 may be specifically configured to:
  • the preset synchronization level may be manually defined, or may be configured by an operator, and the preset synchronization level may be backhaul signaling, or may be high-level signaling of the base station 100 itself.
  • the embodiments of the present invention are not limited.
  • the set of synchronization levels is ⁇ 0, 1, 2, ..., K ⁇ , T ⁇ K, and the source base station with the synchronization level ⁇ does not transmit the synchronization signal, that is, the source base station with the largest synchronization level specified by the standard/protocol does not transmit the synchronization letter.
  • the preset synchronization is performed.
  • the network overhead is also relatively small, but because there are relatively few base stations transmitting the synchronization signal, this may cause some base stations in the macro cellular network to be unable to listen to or receive the appropriate synchronization signal, thereby causing the number of base stations that cannot achieve clock synchronization. Increased, this affects the synchronization performance of the entire macro cellular network. Therefore, the preset synchronization level needs to be compromised when setting, that is, when setting the synchronization level, it is necessary to ensure the synchronization precision of the macro cellular network and to ensure the overhead of the macro cellular network.
  • the base station 100 satisfies the condition for transmitting the second synchronization signal.
  • the first sending module 106 is configured to send the second synchronization signal when the determining module 105 determines that the base station 100 satisfies the condition for transmitting the second synchronization signal.
  • the first sending module 106 may be specifically configured to:
  • the synchronization signal resource pool corresponding to the synchronization level of the base station 100 is selected according to the synchronization level of the base station 100, and the synchronization signal resource pool includes a synchronization signal resource for transmitting the synchronization signal;
  • a second synchronization signal is transmitted on a synchronization signal resource corresponding to the base station 100.
  • each synchronization level base station may be configured with one synchronization signal resource pool, and each synchronization signal resource pool may include multiple synchronization signal resources for transmitting synchronization signals.
  • the base station 100 may first select a synchronization signal resource pool corresponding to the synchronization level of the base station 100 according to the synchronization level of the base station 100, and then according to the proprietary parameters of the base station 100 (such as the base station identifier Cell ID, the radio remote pointer)
  • the RHH ID or the globally unique identifier is not limited in the embodiment of the present invention.
  • the synchronization signal resource corresponding to the parameter of the base station 100 is selected from the synchronization signal resource pool corresponding to the synchronization level of the base station 100, so that the synchronization signal is not There is a problem that two adjacent base stations select the same synchronization signal resource to transmit a corresponding synchronization signal, which is beneficial to improve synchronization precision between base stations. For example, if the number of synchronization signal resources in the synchronization signal resource pool corresponding to the synchronization level of the base station 100 is R, the base station identifier of the base station 100 is R, and the synchronization signal resource pool corresponding to the synchronization level of the base station 100 is used.
  • the synchronization signal resource label is 0, 1 , R-1 , and then the synchronization signal resource corresponding to the remainder of R can be used as the synchronization signal resource for transmitting the second synchronization signal.
  • the base station 100 when the base station 100 selects the synchronization signal resource to send the second synchronization signal, the base station 100 can serve as a source base station, and the other source base stations in the macro cellular network can follow the received signal strength of the second synchronization signal.
  • the signal strength of the transmitted signal is determined, that is, the stronger the signal strength of the synchronization signal received by the other source base station on the synchronization signal resource selected by the base station 100, the other source base station transmits a signal on the synchronization signal resource selected by the base station 100 (synchronization)
  • the signal strength of the signal or other signal is lower, even zero, which is not limited in the embodiment of the present invention, so that interference of other signals on the second synchronization signal can be reduced, and synchronization precision can be improved.
  • the synchronization signal resource pool corresponding to each synchronization level may periodically appear, that is, the synchronization signal resource pool corresponding to each synchronization level in one cycle may be in the order of synchronization level (small to large or large)
  • the embodiment of the present invention is not limited.
  • the synchronization signal resource pool corresponding to all the synchronization levels may be present, and the period value may be set in advance, such as 1 second or 10 seconds.
  • the synchronization signal resource pool corresponding to the synchronization level may be pre-configured in the multicast/multicast single frequency according to the embodiment of the present invention, and the synchronization signal resource pool corresponding to each synchronization level may be concentrated in one subframe or more as much as possible.
  • the synchronization signal resource pool of one synchronization level is continuous, which can reduce the time for the base station to acquire the synchronization signal resource pool corresponding to the synchronization level of the base station, and effectively improve the spectrum efficiency of the base station.
  • the synchronization signal resource pool can be configured in time division duplex uplink subframes 2, 3, 4, 7, 8, 9 or frequency division duplex uplink subframes 1, 2, 3, 6, 7, 8 .
  • the synchronization signal resource pool is configured in the uplink subframe 2, 3, 4, 7, 8, 9 of the time division duplex, and the synchronization signal resource pool of the base station with the synchronization level 0 corresponds to the subframe 2 Synchronization signal resource pool pair of base station with synchronization level 1
  • the synchronization signal resource pool of the base station with the synchronization level 2 corresponds to the subframe 4
  • the synchronization signal resource pool of the base station with the synchronization level 3 corresponds to the subframe 7
  • the synchronization signal resource pool of the base station with the synchronization level of 4 corresponds to the subframe.
  • the synchronization signal resource pool of the base station with the synchronization level of 5 corresponds to the subframe 9.
  • a subframe may include a plurality of synchronization signal resources, and assuming that one subframe can be configured with six synchronization signal resources, when the number of synchronization signal resources in the synchronization signal resource pool of the base station of a synchronization level exceeds six, the synchronization is performed.
  • the synchronization signal resource pool of the level base station can be configured in multiple subframes (such as 1.5 subframes). When configuring the synchronization signal resource pool, the synchronization signal resource pool can be sorted according to the time domain and then by the frequency domain.
  • the synchronization signal resource pools of different synchronization levels may be configured in the same subframe, but the OFDM symbols of the synchronization signal resources in different levels of the synchronization signal resource pool or The offset in the frequency domain is different.
  • the first sending module 106 sends a second synchronization signal, so that the base station that receives the second synchronization signal implements clock synchronization with the base station 100 according to the received second synchronization signal.
  • FIG. 2 is a schematic structural diagram of another base station according to an embodiment of the present invention. As shown in FIG.
  • the base station 200 can include a receiving module 201, a selecting module 202, a clock synchronization module 203, a second sending module 204, a determining module 205, a determining module 206, and a first sending module 207, where: the receiving module 201 The synchronization signal sent by the source base station is received.
  • the source base station may include at least one source base station that has achieved clock synchronization, and the source base station may be a macro base station or a micro base station, which is not limited in the embodiment of the present invention.
  • the macro base station may acquire synchronization information through a Global Positioning System (GPS) and transmit the synchronization signal to the base station 200;
  • GPS Global Positioning System
  • the micro base station receives the macro base station by receiving The synchronization signal of the micro base station that has achieved clock synchronization at the previous level is used to implement clock synchronization, and the synchronization signal is transmitted to the base station 200.
  • the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, a cell-specific reference signal, a channel state information reference signal, a multimedia broadcast multicast service single frequency network reference signal, a positioning reference signal, and a discovery reference signal, etc.
  • the embodiments of the invention are not limited.
  • the selection module 202 is configured to select one of the synchronization signals as the first synchronization signal.
  • the base station 200 may receive a synchronization signal sent by multiple source base stations, and select one of the synchronization signals as the first synchronization signal, where the first synchronization signal may
  • the synchronization signal with the strongest signal strength among the synchronization signals received by the station 200 may also be the synchronization signal in which the signal strength exceeds the preset signal strength threshold and the synchronization level (the smaller the synchronization level, the higher the synchronization precision)
  • the synchronization signal of the synchronization signal sent by the base station that belongs to the same carrier as the base station 200 is the strongest.
  • the embodiment of the present invention is not limited, and the signal strength of the synchronization signal can be reflected by the energy or power of the synchronization signal.
  • the embodiment of the present invention is not limited by the reference signal receiving power or the reference signal receiving quality measured by the synchronization signal.
  • the clock synchronization module 203 is configured to implement clock synchronization with the first source base station that transmits the first synchronization signal according to the first synchronization signal.
  • the second sending module 204 is configured to send, to the first source base station, a request for acquiring a synchronization level of the first source base station.
  • the receiving module 201 is further configured to receive a synchronization level of the first source base station sent by the first source base station.
  • the determining module 205 is configured to determine the synchronization level of the base station 200 according to the synchronization level of the first source base station. For example, if the synchronization level of the first source base station in the embodiment of the present invention is M (M is an integer greater than 0), the synchronization level of the base station 200 is M+1.
  • the determining module 206 is configured to determine, according to the synchronization level of the base station 200, whether the base station 200 satisfies the condition for transmitting the second synchronization signal.
  • the determining module 206 may be specifically configured to:
  • the synchronization level of the base station 200 is less than or equal to a preset synchronization level. If the synchronization level of the base station 200 is less than or equal to a preset synchronization level, it is determined that the base station 200 satisfies the condition for transmitting the second synchronization signal.
  • the first sending module 207 is configured to send the second synchronization signal when the determining module 206 determines that the base station 200 satisfies the condition for transmitting the second synchronization signal.
  • the first sending module 207 can include a selecting submodule 2071 and a sending submodule 2072, where:
  • the selection submodule 2071 is configured to select a synchronization level with the base station 200 according to the synchronization level of the base station 200.
  • the synchronization signal resource pool includes a synchronization signal resource for transmitting a synchronization signal, and selecting a synchronization signal resource corresponding to the base station 200 from the synchronization signal resource pool;
  • the transmitting sub-module 2072 is configured to send the second synchronization signal on the synchronization signal resource corresponding to the base station 200.
  • the first sending module 207 sends the second synchronization signal, so that the base station that receives the second synchronization signal receives the second synchronization signal according to the received
  • the second synchronization signal is synchronized with the clock of the base station 200.
  • FIG. 3 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • the base station 300 can include a memory 301 and a processor 302.
  • the memory 301 stores a set of program codes
  • the processor 302 is configured to call the program code stored in the memory 301 for performing the following operations:
  • the source base station Receiving a synchronization signal sent by the source base station, the source base station comprising at least one source base station that has achieved clock synchronization;
  • the processor 302 before the processor 302 determines the synchronization level of the base station 300 according to the synchronization level of the first source base station, the processor 302 calls the program code stored in the memory 301 to further perform the following operations: sending the first source base station for acquisition a request for a synchronization level of the first source base station;
  • the manner in which the processor 302 determines, according to the synchronization level of the base station 300, whether the base station 300 satisfies the condition for transmitting the second synchronization signal is specifically: It is determined whether the synchronization level of the base station 300 is less than or equal to a preset synchronization level. If the synchronization level of the base station 300 is less than or equal to a preset synchronization level, it is determined that the base station 300 satisfies the condition for transmitting the second synchronization signal.
  • the manner in which the processor 302 sends the second synchronization signal is specifically:
  • the synchronization signal resource pool corresponding to the synchronization level of the base station 300 is selected according to the synchronization level of the base station 300, and the synchronization signal resource pool includes a synchronization signal resource for transmitting the synchronization signal;
  • the second synchronization signal is transmitted on the synchronization signal resource corresponding to the base station 300.
  • FIG. 4 is a schematic flowchart of a method for implementing clock synchronization between base stations according to an embodiment of the present invention. As shown in FIG. 4, the method for implementing clock synchronization between base stations may include the following steps: S401. A target base station receives a synchronization signal sent by a source base station.
  • the source base station may include at least one source base station that has achieved clock synchronization, and the source base station may be a macro base station or a micro base station, which is not limited in the embodiment of the present invention.
  • the source base station is a macro base station
  • the macro base station may acquire synchronization information through a Global Positioning System (GPS) and transmit the synchronization signal to the target base station;
  • GPS Global Positioning System
  • the micro base station receives the macro base station by receiving Or the synchronization signal of the micro base station that has achieved clock synchronization at the previous level to implement clock synchronization, and send the synchronization signal to the target base station.
  • GPS Global Positioning System
  • the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, a cell-specific reference signal, a channel state information reference signal, a multimedia broadcast multicast service single frequency network reference signal, a positioning reference signal, and a discovery reference signal, etc.
  • the embodiments of the invention are not limited.
  • the target base station selects one of the synchronization signals as the first synchronization signal.
  • the target base station may receive the synchronization signal sent by the multiple source base stations, and select the synchronization signal as the first synchronization signal in the synchronization signal, where the first synchronization signal may be the synchronization signal received by the target base station.
  • the synchronization signal with the strongest signal strength can also be the signal strength in the synchronization signal exceeding the preset signal strength threshold and the synchronization level (the smaller the synchronization level, the higher the synchronization accuracy)
  • the small synchronization signal may also be the synchronization signal with the strongest signal strength in the synchronization signal sent by the base station of the same carrier as the target base station, which is not limited in the embodiment of the present invention, and the signal strength of the synchronization signal may pass the energy of the synchronization signal.
  • the embodiment of the present invention is not limited by the power of the reference signal received by the synchronization signal or the received quality of the reference signal.
  • the target base station implements clock synchronization with the first source base station that sends the first synchronization signal according to the first synchronization signal.
  • clock synchronization may include time synchronization and frequency synchronization, and time synchronization between the macro base station and the micro base station and between the micro base stations may be understood as time deviation of signals transmitted between the macro base station and the micro base station, and each micro The time deviation of the signal transmitted between the base stations is within a preset time threshold; the frequency synchronization between the macro base station and the micro base station and between the micro base stations can be understood as the frequency deviation between the macro base station and the micro base station and the respective micro base stations. The frequency deviation between them is within a preset frequency threshold range.
  • the target base station determines, according to a synchronization level of the first source base station, a synchronization level of the target base station.
  • the synchronization level may be used to indicate the synchronization status of each base station, and the base station of each synchronization level includes at least one base station.
  • the macro base station acquires synchronization information through the global positioning system
  • the macro base station is set.
  • the synchronization level is 0.
  • the micro base station 1 obtains the synchronization information by the macro base station
  • the synchronization level of the micro base station 1 is 1.
  • the micro base station 2 obtains the synchronization information through the micro base station 1, the synchronization level of the micro base station 2 is 2, and so on.
  • the synchronization level in the macro cellular network is at most L (L is an integer greater than 0), we can refer to the macro cellular network as an L-hop synchronization network system.
  • L is an integer greater than 0
  • the synchronization level of the first source base station may be configured in a subframe in which the first synchronization signal is located, and the target base station may estimate the synchronization level of the first source base station by using the subframe in which the first synchronization signal is located, and Determining the synchronization level of the target base station according to the synchronization level of the first source base station, and the target base station may further send a request for acquiring the synchronization level of the first source base station to the first source base station, so that the first source base station sends the target base station to the target base station.
  • the synchronization level of the first source base station is not limited in the embodiment of the present invention.
  • the synchronization level of the first source base station in the embodiment of the present invention is M (M is an integer greater than 0), the synchronization level of the target base station is M+1.
  • the target base station determines, according to the synchronization level of the target base station, whether the target base station satisfies the condition for transmitting the second synchronization signal.
  • the specific manner in which the target base station determines, according to the synchronization level of the target base station, whether the target base station satisfies the condition for transmitting the second synchronization signal may be:
  • the target base station determines whether the synchronization level of the target base station is less than or equal to a preset synchronization level. If the synchronization level of the target base station is less than or equal to a preset synchronization level, it is determined that the target base station satisfies the condition for transmitting the second synchronization signal.
  • the preset synchronization level may be manually defined, or may be configured by an operator, and the preset synchronization level may be backhaul signaling or high-level signaling of the target base station itself.
  • the embodiments of the present invention are not limited.
  • the set of synchronization levels is ⁇ 0, 1, 2, ..., K ⁇ , T ⁇ K
  • the source base station with the synchronization level ⁇ does not transmit the synchronization signal, that is, the source base station with the largest synchronization level specified by the standard/protocol does not transmit the synchronization letter.
  • the preset synchronization is performed. The level needs to be compromised when setting, that is, when setting the synchronization level, it is necessary to ensure the synchronization precision of the macro cellular network and to ensure the overhead of the macro cellular network.
  • the target base station satisfies the condition for transmitting the second synchronization signal.
  • the target base station If it is determined that the target base station satisfies the condition for transmitting the second synchronization signal, the target base station sends the second synchronization signal.
  • the specific manner in which the target base station sends the second synchronization signal may be:
  • the target base station selects a synchronization signal resource pool corresponding to the synchronization level of the target base station according to the synchronization level of the target base station, and the synchronization signal resource pool includes a synchronization signal resource for transmitting the synchronization signal; the target base station selects a corresponding signal base pool from the synchronization signal resource pool. Synchronization signal resource; the target base station transmits a second synchronization signal on the synchronization signal resource corresponding to the target base station.
  • each synchronization level base station may be configured with one synchronization signal resource pool, and each synchronization signal resource pool may include multiple synchronization signal resources for transmitting synchronization signals.
  • the target base station may first select a synchronization signal resource pool corresponding to the synchronization level of the target base station according to the synchronization level of the target base station, and then according to the specific parameters of the target base station (such as the base station identification Cell ID, the radio remote head identifier RHH ID, or the global unique The identifier and the like are not limited in the embodiment of the present invention) from the target base station
  • the synchronization signal resource pool corresponding to the parameter of the target base station is selected in the synchronization signal resource pool corresponding to the synchronization level, so that there is no problem that the adjacent two base stations select the same synchronization signal resource to send the corresponding synchronization signal, It is beneficial to improve the synchronization accuracy between base stations.
  • the synchronization signal resource pool corresponding to each synchronization level may periodically appear, that is, the synchronization signal resource pool corresponding to each synchronization level in one cycle may be in the order of synchronization level (small to large or large)
  • the embodiment of the present invention is not limited.
  • the synchronization signal resource pool corresponding to all the synchronization levels may be present, and the period value may be set in advance, such as 1 second or 10 seconds.
  • the synchronization signal resource pool corresponding to the synchronization level may be pre-configured in the multicast/multicast single frequency according to the embodiment of the present invention, and the synchronization signal resource pool corresponding to each synchronization level may be concentrated in one subframe or more as much as possible.
  • the synchronization signal resource pool of one synchronization level is continuous, which can reduce the time for the base station to acquire the synchronization signal resource pool corresponding to the synchronization level of the base station, and effectively improve the spectrum efficiency of the base station.
  • the target base station sends the second synchronization signal, so that the base station that receives the second synchronization signal implements clock synchronization with the target base station according to the received second synchronization signal.
  • the target base station receives the synchronization signal sent by the source base station, and selects one of the synchronization signals as the first synchronization signal, and then implements clock synchronization with the first source base station that sends the first synchronization signal according to the first synchronization signal.
  • Embodiments of the present invention can determine whether to transmit a synchronization signal according to its synchronization level, reduce the overhead of the macro cellular network, and ensure the synchronization performance of the entire macro cellular network. Referring to FIG. 5, FIG.
  • the method for implementing clock synchronization between base stations may include the following steps: S501: A target base station receives a synchronization signal sent by a source base station.
  • the source base station may include at least one source base station that has achieved clock synchronization, and the source base station may be a macro base station or a micro base station, which is not limited in the embodiment of the present invention.
  • Source base station Is a macro base station, the macro base station can acquire synchronization information through a Global Positioning System (GPS), and send the synchronization signal to the target base station; if the source base station is a micro base station, the micro base station receives the macro base station or the previous one by receiving The synchronization signal of the micro base station whose level has been clock synchronized is used to implement clock synchronization, and the synchronization signal is transmitted to the target base station.
  • GPS Global Positioning System
  • the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, a cell-specific reference signal, a channel state information reference signal, a multimedia broadcast multicast service single frequency network reference signal, a positioning reference signal, and a discovery reference signal, etc.
  • the embodiments of the invention are not limited.
  • the target base station selects one of the synchronization signals as the first synchronization signal.
  • the target base station may receive the synchronization signal sent by the multiple source base stations, and select one of the synchronization signals as the first synchronization signal, where the first synchronization signal may be the synchronization signal received by the target base station.
  • the synchronization signal with the strongest signal strength may also be the synchronization signal whose synchronization signal exceeds the preset signal strength threshold and the synchronization level (the smaller the synchronization level is, the higher the synchronization precision is), or may be the same as the target base station.
  • the synchronization signal with the strongest signal strength in the synchronization signal sent by the base station of the operator is not limited in the embodiment of the present invention, and the signal strength of the synchronization signal may be reflected by the energy or power of the synchronization signal, or may be measured by using the synchronization signal.
  • the reference signal receiving power or the reference signal receiving quality is embodied, which is not limited in the embodiment of the present invention.
  • the target base station implements clock synchronization with the first source base station that sends the first synchronization signal according to the first synchronization signal.
  • clock synchronization may include time synchronization and frequency synchronization, and time synchronization between the macro base station and the micro base station and between the micro base stations may be understood as time deviation of signals transmitted between the macro base station and the micro base station, and each micro The time deviation of the signal transmitted between the base stations is within a preset time threshold; the frequency synchronization between the macro base station and the micro base station and between the micro base stations can be understood as the frequency deviation between the macro base station and the micro base station and the respective micro base stations. The frequency deviation between them is within a preset frequency threshold range.
  • the target base station sends a request for acquiring a synchronization level of the first source base station to the first source base station.
  • the target base station receives a synchronization level of the first source base station sent by the first source base station.
  • the target base station determines a synchronization level of the target base station according to a synchronization level of the first source base station. For example, if the synchronization level of the first source base station in the embodiment of the present invention is M (M is greater than or equal to The integer level of 0), the synchronization level of the target base station is M+1.
  • the target base station determines, according to the synchronization level of the target base station, whether the target base station satisfies the condition for transmitting the second synchronization signal.
  • the specific manner in which the target base station determines, according to the synchronization level of the target base station, whether the target base station satisfies the condition for transmitting the second synchronization signal may be:
  • the target base station determines whether the synchronization level of the target base station is less than or equal to a preset synchronization level. If the synchronization level of the target base station is less than or equal to a preset synchronization level, it is determined that the target base station satisfies the condition for transmitting the second synchronization signal.
  • the target base station satisfies the condition for transmitting the second synchronization signal.
  • the target base station If it is determined that the target base station satisfies the condition for transmitting the second synchronization signal, the target base station sends the second synchronization signal.
  • the specific manner in which the target base station sends the second synchronization signal may be:
  • the target base station selects a synchronization signal resource pool corresponding to the synchronization level of the target base station according to the synchronization level of the target base station, and the synchronization signal resource pool includes a synchronization signal resource for transmitting the synchronization signal; the target base station selects a corresponding signal base pool from the synchronization signal resource pool. Synchronization signal resource; the target base station transmits a second synchronization signal on the synchronization signal resource corresponding to the target base station.
  • each synchronization level base station may be configured with one synchronization signal resource pool, and each synchronization signal resource pool may include multiple synchronization signal resources for transmitting synchronization signals.
  • the target base station may first select a synchronization signal resource pool corresponding to the synchronization level of the target base station according to the synchronization level of the target base station, and then according to the specific parameters of the target base station (such as the base station identification Cell ID, the radio remote head identifier RHH ID, or the global unique
  • the identifier and the like are not limited in the embodiment of the present invention.
  • the synchronization signal resource corresponding to the parameter of the target base station is selected from the synchronization signal resource pool corresponding to the synchronization level of the target base station, so that there are no adjacent two.
  • the problem that the base station selects the same synchronization signal resource to transmit the corresponding synchronization signal is beneficial to improve the synchronization precision between the base stations.
  • the target base station sends the second synchronization signal, so that the base station that receives the second synchronization signal implements clock synchronization with the target base station according to the received second synchronization signal.
  • Embodiments of the present invention can enable a base station to determine whether to send a synchronization signal according to its synchronization level, and reduce The overhead of the macro cellular network is reduced and the synchronization performance of the entire macro cellular network is guaranteed.
  • the modules or sub-modules in the base station of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • the receiving module in the base station may be a wireless receiving device
  • the first sending module and the second sending module may be wireless transmitting devices
  • the selecting module may be a signal processing device
  • the clock synchronization module, the determining module, and the determining module may be controlled.
  • the device and the like are not limited in the embodiment of the present invention.
  • the module or the sub-module in the embodiment of the present invention may be implemented by a general-purpose integrated circuit, such as a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit).
  • a general-purpose integrated circuit such as a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit).
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • a method for implementing clock synchronization between base stations and a description of the above embodiments of the base station provided by the embodiments of the present invention are only for helping to understand the method and core idea of the present invention. Meanwhile, for those skilled in the art, The present invention is not limited by the scope of the present invention.

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Abstract

本发明实施例公开了一种实现基站间时钟同步的方法及基站,该方法包括目标基站接收源基站发送的同步信号,并选择其中一个同步信号作为第一同步信号,然后根据第一同步信号实现与发送第一同步信号的第一源基站的时钟同步,再根据第一源基站的同步级别确定目标基站的同步级别,之后根据目标基站的同步级别判断是否满足发送第二同步信号的条件,若确定满足发送第二同步信号的条件,则发送第二同步信号,以使接收到第二同步信号的基站根据接收到的第二同步信号实现与目标基站的时钟同步。实施本发明实施例可以使基站根据其同步级别决定是否发送同步信号,减少了宏蜂窝网的开销并保证了整个宏蜂窝网的同步性能。

Description

一种实现基站间时钟同步的方法及基站 技术领域
本发明涉及通信技术领域,具体涉及一种实现基站间时钟同步的方法及基 站。 背景技术
随着通信技术的快速发展,人们对数据业务流量的需求也在逐渐增加, 为 了应对人们对数据业务流量的需求, 在传统的宏基站蜂窝网络(以下筒称 "宏 蜂窝网") 的基础上, 大量的微型基站被密集部署在一些室内或室外的热点地 区。 由于具有覆盖范围小、 发射功率低等特点, 微型基站能够提供高速率的数 据传输服务,且能够对宏蜂窝网的数据业务进行分流,减少了运营商的布网成 本, 为了保证宏基站与微型基站之间以及各个微型基站之间正常的数据传输, 宏基站与微型基站之间以及各个微型基站之间需要实现时钟同步。 号以使未实现时钟同步的基站实现时钟同步, 这造成了一定的网络开销,且不 利于整个宏蜂窝网的同步性能。 发明内容
本发明实施例公开了一种实现基站间时钟同步的方法½站,用于减少宏 蜂窝网的开销并保证了宏蜂窝网的同步性能。
本发明实施例第一方面公开了一种基站, 包括:
接收模块, 用于接收源基站发送的同步信号, 所述源基站包括至少一个已 实现时钟同步的源基站;
选择模块, 用于选择所述同步信号中其中一个同步信号作为第一同步信 时钟同步模块,用于根据所述第一同步信号实现与发送所述第一同步信号 的第一源基站的时钟同步; 确定模块, 用于根据所述第一源基站的同步级别确定所述基站的同步级 别;
判断模块,用于根据所述基站的同步级别判断所述基站是否满足发送第二 同步信号的条件;
第一发送模块,用于当所述判断模块确定所述基站满足发送第二同步信号 的条件时,发送所述第二同步信号, 以使接收到所述第二同步信号的基站根据 接收到的所述第二同步信号实现与所述基站的时钟同步。
在本发明实施例第一方面的第一种可能的实现方式中, 所述基站还包括: 第二发送模块,用于向所述第一源基站发送用于获取所述第一源基站的同 步级别的请求;
所述接收模块,还用于接收所述第一源基站发送的所述第一源基站的同步 级别。
结合本发明实施例第一方面或本发明实施例第一方面的第一种可能的实 现方式,在本发明实施例第一方面的第二种可能的实现方式中, 所述判断模块 具体用于判断所述基站的同步级别是否小于等于预先设置的同步级别,若所述 基站的同步级别小于等于所述预先设置的同步级别,则确定所述基站满足发送 第二同步信号的条件。
结合本发明实施例第一方面的第二种可能的实现方式,在本发明实施例第 一方面的第三种可能的实现方式中,所述第一发送模块包括选择子模块以及发 送子模块, 其中:
所述选择子模块,用于根据所述基站的同步级别选择与所述基站的同步级 别对应的同步信号资源池,所述同步信号资源池包括用于发送同步信号的同步 信号资源, 并从所述同步信号资源池中选择与所述基站对应的同步信号资源; 所述发送子模块,用于在与所述基站对应的同步信号资源上发送所述第二 同步信号。
本发明实施例第二方面公开了一种基站, 包括存储器和处理器, 所述存储 器中存储一组程序代码, 且所述处理器用于调用所述存储器中存储的程序代 码, 用于执行以下操作:
接收源基站发送的同步信号,所述源基站包括至少一个已实现时钟同步的 源基站;
选择所述同步信号中其中一个同步信号作为第一同步信号;
根据所述第一同步信号实现与发送所述第一同步信号的第一源基站的时 钟同步;
根据所述第一源基站的同步级别确定所述基站的同步级别;
根据所述基站的同步级别判断所述基站是否满足发送第二同步信号的条 件;
若确定所述基站满足发送第二同步信号的条件, 则发送所述第二同步信 号,以使接收到所述第二同步信号的基站根据接收到的所述第二同步信号实现 与所述基站的时钟同步。
在本发明实施例第二方面的第一种可能的实现方式中,所述处理器根据所 述第一源基站的同步级别确定所述基站的同步级别之前,所述处理器调用所述 存储器中存储的程序代码还执行以下操作:
向所述第一源基站发送用于获取所述第一源基站的同步级别的请求; 接收所述第一源基站发送的所述第一源基站的同步级别。
结合本发明实施例第二方面或本发明实施例第二方面的第一种可能的实 现方式,在本发明实施例第二方面的第二种可能的实现方式中, 所述处理器根 据所述基站的同步级别判断所述基站是否满足发送第二同步信号的条件的方 式具体为:
判断所述基站的同步级别是否小于等于预先设置的同步级别,若所述基站 的同步级别小于等于所述预先设置的同步级别,则确定所述基站满足发送第二 同步信号的条件。
结合本发明实施例第二方面的第二种可能的实现方式,在本发明实施例第 二方面的第三种可能的实现方式中,所述处理器发送所述第二同步信号的方式 具体为:
根据所述基站的同步级别选择与所述基站的同步级别对应的同步信号资 源池, 所述同步信号资源池包括用于发送同步信号的同步信号资源;
从所述同步信号资源池中选择与所述基站对应的同步信号资源; 在与所述基站对应的同步信号资源上发送所述第二同步信号。 本发明实施例第三方面公开了一种实现基站间时钟同步的方法, 包括: 目标基站接收源基站发送的同步信号,所述源基站包括至少一个已实现时 钟同步的源基站;
所述目标基站选择所述同步信号中其中一个同步信号作为第一同步信号; 所述目标基站根据所述第一同步信号实现与发送所述第一同步信号的第 一源基站的时钟同步;
所述目标基站根据所述第一源基站的同步级别确定所述目标基站的同步 级别;
所述目标基站根据所述目标基站的同步级别判断所述目标基站是否满足 发送第二同步信号的条件;
若确定所述目标基站满足发送第二同步信号的条件,则所述目标基站发送 所述第二同步信号,以使接收到所述第二同步信号的基站根据接收到的所述第 二同步信号实现与所述目标基站的时钟同步。
在本发明实施例第三方面的第一种可能的实现方式中,所述目标基站根据 所述第一源基站的同步级别确定所述目标基站的同步级别之前,所述方法还包 括:
所述目标基站向所述第一源基站发送用于获取所述第一源基站的同步级 别的请求;
所述目标基站接收所述第一源基站发送的所述第一源基站的同步级别。 结合本发明实施例第三方面以及本发明实施例第三方面的第一种可能的 实现方式,在本发明实施例第三方面的第二种可能的实现方式中, 所述目标基 站根据所述目标基站的同步级别判断所述目标基站是否满足发送第二同步信 号的条件包括:
所述目标基站判断所述目标基站的同步级别是否小于等于预先设置的同 步级别, 若所述目标基站的同步级别小于等于所述预先设置的同步级别, 则确 定所述目标基站满足发送第二同步信号的条件。
结合本发明实施例第三方面的第二种可能的实现方式,在本发明实施例第 三方面的第三种可能的实现方式中, 所述目标基站发送所述第二同步信号包 括: 所述目标基站根据所述目标基站的同步级别选择与所述目标基站的同步 级别对应的同步信号资源池,所述同步信号资源池包括用于发送同步信号的同 步信号资源;
所述目标基站从所述同步信号资源池中选择与所述目标基站对应的同步 信号资源;
所述目标基站在与所述目标基站对应的同步信号资源上发送所述第二同 步信号。
本发明实施例中, 目标基站接收源基站发送的同步信号, 并选择其中一个 同步信号作为第一同步信号,然后根据第一同步信号实现与发送第一同步信号 的第一源基站的时钟同步,再根据第一源基站的同步级别确定目标基站的同步 级别, 之后根据目标基站的同步级别判断是否满足发送第二同步信号的条件, 若确定满足发送第二同步信号的条件, 则发送第二同步信号, 以使接收到第二 同步信号的基站根据接收到的第二同步信号实现与目标基站的时钟同步。实施 本发明实施例可以 站根据其同步级别决定是否发送同步信号,减少了宏蜂 窝网的开销并保证了整个宏蜂窝网的同步性能。 附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例中所需要 使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发明的一 些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还 可以根据这些附图获得其他的附图。
图 1是本发明实施例公开的一种基站的结构示意图;
图 2是本发明实施例公开的另一种基站的结构示意图;
图 3是本发明实施例公开的又一种基站的结构示意图;
图 4是本发明实施例公开的一种实现基站间时钟同步的方法的流程示意 图;
图 5是本发明实施例公开的另一种实现基站间时钟同步的方法的流程示意 图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例公开了一种实现基站间时钟同步的方法及基站,可以 站 根据其同步级别决定是否发送同步信号,减少了宏蜂窝网的开销并保证了整个 宏蜂窝网的同步性能。
请参阅图 1 , 图 1是本发明实施例公开的一种基站的结构示意图。 如图 1所 示, 该基站 100可以包括接收模块 101、 选择模块 102、 时钟同步模块 103、 确定 模块 104、 判断模块 105以及第一发送模块 106, 其中:
接收模块 101用于接收源基站发送的同步信号。
本发明实施例中, 源基站可以包括至少一个已实现时钟同步的源基站,且 源基站可以是宏基站, 也可以是微型基站, 本发明实施例不做限定。 若源基站 是宏基站, 则宏基站可以通过全球定位系统( GPS, Global Positioning System ) 获取同步信息, 并将同步信号发送至基站 100; 若源基站是微型基站, 则微型 基站通过接收来自宏基站或上一级别已实现时钟同步的微型基站的同步信号 来实现时钟同步, 并将同步信号发送至基站 100。
本发明实施例中, 同步信号可以是主同步信号、 辅同步信号、 小区特定参 考信号、 信道状态信息参考信号、 多媒体广播多播服务单频网络参考信号、 定 位参考信号以及发现参考信号等, 本发明实施例不做限定。
选择模块 102用于选择同步信号中其中一个同步信号作为第一同步信号。 本发明实施例中, 基站 100可以接收到多个源基站发送的同步信号, 并选 择同步信号中其中一个同步信号作为第一同步信号, 其中, 第一同步信号可以 是基站 100接收到的同步信号中信号强度最强的同步信号, 也可以是同步信号 中信号强度超过预设信号强度阈值且同步级别(同步级别越小,同步精度越高) 最小的同步信号, 还可以是与基站 100属于相同运营商的基站发送的同步信号 中信号强度最强的同步信号, 本发明实施例不做限定,且同步信号的信号强度 可以通过同步信号的能量或功率来体现,也可以通过利用同步信号测量得到的 参考信号接收功率或参考信号接收质量来体现, 本发明实施例不做限定。 时钟同步模块 103用于根据第一同步信号实现与发送第一同步信号的第一 源基站的时钟同步。
本发明实施例中, 时钟同步可以包括时间同步以及频率同步,宏基站与微 型基站之间以及各个微型基站之间实现时间同步可以理解为宏基站与微型基 站之间发送信号的时间偏差以及各个微型基站之间发送信号的时间偏差在预 设的时间阈值范围内;宏基站与微型基站之间以及各个微型基站之间实现频率 同步可以理解为宏基站与微型基站之间的频率偏差以及各个微型基站之间的 频率偏差在预设的频率阈值范围内。
确定模块 104用于根据第一源基站的同步级别确定基站 100的同步级别。 本发明实施例中, 同步级别可以用来表示各个基站的同步状态,每个同步 级别的基站包括至少一个基站,举例来说,假设宏基站通过全球定位系统获取 同步信息后, 即设置宏基站的同步级别为 0,微型基站 1通过宏基站获得同步信 息后, 微型基站 1的同步级别为 1 , 微型基站 2通过微型基站 1获得同步信息后, 微型基站 2的同步级别为 2, 以此类推, 若宏蜂窝网中的同步级别最高为 L ( L 是大于 0的整数), 则我们可以将该宏蜂窝网称为 L跳同步网络系统。 本发明实 施例中, 如果没有特别说明, 同步级别越小代表着同步精度越高。
本发明实施例中,第一源基站的同步级别可以配置在第一同步信号所在的 子帧中, 且基站 100可以通过第一同步信号所在的子帧推测出第一源基站的同 步级别, 并根据第一源基站的同步级别确定出基站 100自身的同步级别, 基站 100还可以向第一源基站发送用于获取第一源基站的同步级别的请求, 以使第 一源基站向基站 100发送第一源基站的同步级别, 本发明实施例不做限定。
举例来说, 若本发明实施例中的第一源基站的同步级别为 M ( M是大于等 于 0的整数), 则基站 100的同步级别为 M+l。
判断模块 105用于根据基站 100的同步级别判断基站 100是否满足发送第二 同步信号的条件。
作为一种可选的实施方式, 判断模块 105可以具体用于:
判断基站 100的同步级别是否小于等于预先设置的同步级别, 若基站 100 的同步级别小于等于预先设置的同步级别, 则确定基站 100满足发送第二同步 信号的条件。
本发明实施例中,预先设置的同步级别可以是由人为规定的,也可以是由 运营商配置的, 且预先设置的同步级别可以是回程信令, 也可以是基站 100自 身的高层信令, 本发明实施例不做限定。 举例来说, 若正整数 K是标准 /协议规 定的同步级别中的最大值, 且假设同步级别从 0开始以及预先设置的同步级别 为 T, 则同步级别的集合为 {0, 1 , 2, ... , K}, T<K, 且同步级别为 Κ的源基 站不发送同步信号, 即标准 /协议规定的同步级别最大的源基站不发送同步信 本发明实施例中,预先设置的同步级别越小, 整个宏蜂窝网中已经实现时 钟同步的基站的同步跳数就越小,已经实现时钟同步的基站间的同步精度就越 高, 由于较少的基站发送同步信号, 宏蜂窝网中的网络开销也比较小, 但由于 发送同步信号的基站比较少,这可能会导致宏蜂窝网中有些基站无法侦听或接 收到合适的同步信号, 进而导致了不能实现时钟同步的基站的个数增多,这影 响了整个宏蜂窝网的同步性能。 因此,预先设置的同步级别在设置时需要折中 考虑,即在设置同步级别时既要保证宏蜂窝网的同步精度又要保证能够减少宏 蜂窝网的开销。
举例来说, 假设预先设置的同步级别为 5, 且基站 100的同步级别为 3, 则 可以确定基站 100满足发送第二同步信号的条件。
第一发送模块 106用于当判断模块 105确定基站 100满足发送第二同步信号 的条件时, 发送第二同步信号。
作为一种可选的实施方式, 第一发送模块 106可以具体用于:
根据基站 100的同步级别选择与基站 100的同步级别对应的同步信号资源 池, 同步信号资源池包括用于发送同步信号的同步信号资源;
从同步信号资源池中选择与基站 100对应的同步信号资源;
在与基站 100对应的同步信号资源上发送第二同步信号。
本发明实施例中, 每个同步级别的基站都可以配置一个同步信号资源池, 且每个同步信号资源池可以包括用于发送同步信号的多个同步信号资源。基站 100可以先根据基站 100的同步级别选择与基站 100的同步级别对应的同步信号 资源池, 然后再根据基站 100的专有参数(如基站标识 Cell ID、 射频拉远头标 识 RHH ID或全球唯一标识等, 本发明实施例不做限定)从与基站 100的同步级 别对应的同步信号资源池中选择与基站 100的参数对应的同步信号资源发送同 步信号,这样就不会存在相邻的两个基站选择相同的同步信号资源发送相应的 同步信号的问题, 有利于提高基站间的同步精度。 举例来说, 假设基站 100的 基站标识为 Ν且与基站 100的同步级别对应的同步信号资源池中的同步信号资 源的个数为 R, 则与基站 100的同步级别对应的同步信号资源池中的同步信号 资源标号为 0, 1 , R-1 , 则 Ν对 R取余数对应的同步信号资源就可以作为用 于发送第二同步信号的同步信号资源。
本发明实施例中, 基站 100选择同步信号资源发送第二同步信号时, 基站 100就可以作为一个源基站, 宏蜂窝网中的其它源基站就可以按照接收到的第 二同步信号的信号强度相反性的决定其发送信号的信号强度,即其它源基站在 基站 100选择的同步信号资源上接收到的同步信号的信号强度越强, 其它源基 站在基站 100选择的同步信号资源上发送信号 (同步信号或其它信号) 的信号 强度就越低, 甚至为零, 本发明实施例不做限定, 这样可以减少其它信号对第 二同步信号的干扰, 提高同步精度。
本发明实施例中, 每个同步级别对应的同步信号资源池可以周期性的出 现,即在一个周期内每个同步级别对应的同步信号资源池可以按照同步级别的 顺序(从小到大或从大到小, 本发明实施例不做限定)出现所有同步级别对应 的同步信号资源池, 周期值可以预先设置, 如 1秒或 10秒等, 本发明实施例不 做限定。 所有同步级别对应的同步信号资源池可以预先配置在多播 /组播单频 本发明实施例不做限定,且每个同步级别对应的同步信号资源池可以尽可能的 集中在一个子帧或多个子帧中, 即一个同步级别的同步信号资源池是连续的, 这样可以减少基站获取与基站的同步级别对应的同步信号资源池的时间,有效 提高基站的频谱效率。
举例来说, 同步信号资源池可以配置在时分双工的上行子帧 2, 3, 4, 7, 8, 9或频分双工的上行子帧 1 , 2, 3, 6, 7, 8中。 在一个周期内, 以将同步信 号资源池配置在时分双工的上行子帧 2, 3, 4, 7, 8, 9中为例, 同步级别为 0 的基站的同步信号资源池对应子帧 2,同步级别为 1的基站的同步信号资源池对 应子帧 3, 同步级别为 2的基站的同步信号资源池对应子帧 4, 同步级别为 3的基 站的同步信号资源池对应子帧 7,同步级别为 4的基站的同步信号资源池对应子 帧 8, 同步级别为 5的基站的同步信号资源池对应子帧 9。 一个子帧可以包括多 个同步信号资源, 假设一个子帧可以配置 6个同步信号资源, 当某个同步级别 的基站的同步信号资源池中同步信号资源的个数超过 6个时, 则该同步级别的 基站的同步信号资源池可以配置在多个子帧 (如 1.5个子帧) 中, 则在配置同 步信号资源池时,可以先按照时域排序再按照频域排序; 当某个同步级别的基 站的同步信号资源池中同步信号资源的个数少于 6个时, 不同同步级别的同步 信号资源池可以配置在同一个子帧中,但不同级别的同步信号资源池中同步信 号资源的 OFDM符号或频域的偏置不同。 本发明实施例中, 第一发送模块 106 发送第二同步信号以使接收到第二同步信号的基站根据接收到的第二同步信 号实现与基站 100的时钟同步。
实施本发明实施例可以使基站根据其同步级别决定是否发送同步信号,且 当基站发送同步信号时基站选择与基站对应的同步信号资源发送同步信号,减 少了宏蜂窝网的开销并保证了整个宏蜂窝网的同步性能。 请参阅图 2, 图 2是本发明实施例公开的另一种基站的结构示意图。 如图 2 所示, 该基站 200可以包括接收模块 201、 选择模块 202、 时钟同步模块 203、 第 二发送模块 204、 确定模块 205、 判断模块 206以及第一发送模块 207, 其中: 接收模块 201用于接收源基站发送的同步信号。
本发明实施例中, 源基站可以包括至少一个已实现时钟同步的源基站,且 源基站可以是宏基站, 也可以是微型基站, 本发明实施例不做限定。 若源基站 是宏基站, 则宏基站可以通过全球定位系统( GPS , Global Positioning System ) 获取同步信息, 并将同步信号发送至基站 200; 若源基站是微型基站, 则微型 基站通过接收来自宏基站或上一级别已实现时钟同步的微型基站的同步信号 来实现时钟同步, 并将同步信号发送至基站 200。
本发明实施例中, 同步信号可以是主同步信号、 辅同步信号、 小区特定参 考信号、 信道状态信息参考信号、 多媒体广播多播服务单频网络参考信号、 定 位参考信号以及发现参考信号等, 本发明实施例不做限定。 选择模块 202用于选择同步信号中其中一个同步信号作为第一同步信号。 本发明实施例中, 基站 200可以接收到多个源基站发送的同步信号, 并选 择同步信号中其中一个同步信号作为第一同步信号, 其中, 第一同步信号可以
^^站 200接收到的同步信号中信号强度最强的同步信号, 也可以是同步信号 中信号强度超过预设信号强度阈值且同步级别(同步级别越小,同步精度越高) 最小的同步信号, 还可以是与基站 200属于相同运营商的基站发送的同步信号 中信号强度最强的同步信号, 本发明实施例不做限定,且同步信号的信号强度 可以通过同步信号的能量或功率来体现,也可以通过利用同步信号测量得到的 参考信号接收功率或参考信号接收质量来体现, 本发明实施例不做限定。
时钟同步模块 203用于根据第一同步信号实现与发送第一同步信号的第一 源基站的时钟同步。
第二发送模块 204用于向第一源基站发送用于获取第一源基站的同步级别 的请求。
作为一种可选的实施方式, 接收模块 201还用于接收第一源基站发送的第 一源基站的同步级别。
确定模块 205用于根据第一源基站的同步级别确定基站 200的同步级别。 举例来说, 若本发明实施例中的第一源基站的同步级别为 M ( M是大于等 于 0的整数), 则基站 200的同步级别为 M+l。
判断模块 206用于根据基站 200的同步级别判断基站 200是否满足发送第二 同步信号的条件。
作为一种可选的实施方式, 判断模块 206可以具体用于:
判断基站 200的同步级别是否小于等于预先设置的同步级别, 若基站 200 的同步级别小于等于预先设置的同步级别, 则确定基站 200满足发送第二同步 信号的条件。
第一发送模块 207用于当判断模块 206确定基站 200满足发送第二同步信号 的条件时, 发送第二同步信号。
作为一种可选的实施方式, 第一发送模块 207可以包括选择子模块 2071以 及发送子模块 2072, 其中:
选择子模块 2071用于根据基站 200的同步级别选择与基站 200的同步级别 对应的同步信号资源池,同步信号资源池包括用于发送同步信号的同步信号资 源, 并从同步信号资源池中选择与基站 200对应的同步信号资源;
发送子模块 2072用于在与基站 200对应的同步信号资源上发送第二同步信 本发明实施例中, 第一发送模块 207发送第二同步信号以使接收到第二同 步信号的基站根据接收到的第二同步信号实现与基站 200的时钟同步。
实施本发明实施例可以使基站根据其同步级别决定是否发送同步信号,且 当基站发送同步信号时基站选择与基站对应的同步信号资源发送同步信号,减 少了宏蜂窝网的开销并保证了整个宏蜂窝网的同步性能。 请参阅图 3 , 图 3是本发明实施例公开的又一种基站的结构示意图。 如图 3 所示, 该基站 300可以包括存储器 301和处理器 302, 其中, 存储器 301中存储一 组程序代码,且处理器 302用于调用存储器 301中存储的程序代码, 用于执行以 下操作:
接收源基站发送的同步信号,源基站包括至少一个已实现时钟同步的源基 站;
选择同步信号中其中一个同步信号作为第一同步信号;
根据第一同步信号实现与发送第一同步信号的第一源基站的时钟同步; 根据第一源基站的同步级别确定基站 300的同步级别;
根据基站 300的同步级别判断基站 300是否满足发送第二同步信号的条件; 若确定基站 300满足发送第二同步信号的条件, 则发送第二同步信号, 以 使接收到第二同步信号的基站根据接收到的第二同步信号实现与基站 300的时 钟同步。
在一个实施例中,处理器 302根据第一源基站的同步级别确定基站 300的同 步级别之前, 处理器 302调用存储器 301中存储的程序代码还执行以下操作: 向第一源基站发送用于获取第一源基站的同步级别的请求;
接收第一源基站发送的第一源基站的同步级别。
在一个实施例中, 处理器 302根据基站 300的同步级别判断基站 300是否满 足发送第二同步信号的条件的方式具体为: 判断基站 300的同步级别是否小于等于预先设置的同步级别, 若基站 300 的同步级别小于等于预先设置的同步级别, 则确定基站 300满足发送第二同步 信号的条件。
在一个实施例中, 处理器 302发送第二同步信号的方式具体为:
根据基站 300的同步级别选择与基站 300的同步级别对应的同步信号资源 池, 同步信号资源池包括用于发送同步信号的同步信号资源;
从同步信号资源池中选择与基站 300对应的同步信号资源;
在与基站 300对应的同步信号资源上发送第二同步信号。
实施本发明实施例可以使基站根据其同步级别决定是否发送同步信号,且 当基站发送同步信号时基站选择与基站对应的同步信号资源发送同步信号,减 少了宏蜂窝网的开销并保证了整个宏蜂窝网的同步性能。 请参阅图 4,图 4是本发明实施例公开的一种实现基站间时钟同步的方法的 流程示意图。 如图 4所示, 该实现基站间时钟同步的方法可以包括以下步骤: S401、 目标基站接收源基站发送的同步信号。
本发明实施例中, 源基站可以包括至少一个已实现时钟同步的源基站,且 源基站可以是宏基站, 也可以是微型基站, 本发明实施例不做限定。 若源基站 是宏基站, 则宏基站可以通过全球定位系统( GPS , Global Positioning System ) 获取同步信息, 并将同步信号发送至目标基站; 若源基站是微型基站, 则微型 基站通过接收来自宏基站或上一级别已实现时钟同步的微型基站的同步信号 来实现时钟同步, 并将同步信号发送至目标基站。
本发明实施例中, 同步信号可以是主同步信号、 辅同步信号、 小区特定参 考信号、 信道状态信息参考信号、 多媒体广播多播服务单频网络参考信号、 定 位参考信号以及发现参考信号等, 本发明实施例不做限定。
S402、 目标基站选择同步信号中其中一个同步信号作为第一同步信号。 本发明实施例中, 目标基站可以接收到多个源基站发送的同步信号, 并选 择同步信号中其中同步信号作为第一同步信号, 其中, 第一同步信号可以是目 标基站接收到的同步信号中信号强度最强的同步信号,也可以是同步信号中信 号强度超过预设信号强度阈值且同步级别(同步级别越小, 同步精度越高)最 小的同步信号,还可以是与目标基站属于相同运营商的基站发送的同步信号中 信号强度最强的同步信号, 本发明实施例不做限定,且同步信号的信号强度可 以通过同步信号的能量或功率来体现,也可以通过利用同步信号测量得到的参 考信号接收功率或参考信号接收质量来体现, 本发明实施例不做限定。
5403、目标基站根据第一同步信号实现与发送第一同步信号的第一源基站 的时钟同步。
本发明实施例中, 时钟同步可以包括时间同步以及频率同步,宏基站与微 型基站之间以及各个微型基站之间实现时间同步可以理解为宏基站与微型基 站之间发送信号的时间偏差以及各个微型基站之间发送信号的时间偏差在预 设的时间阈值范围内;宏基站与微型基站之间以及各个微型基站之间实现频率 同步可以理解为宏基站与微型基站之间的频率偏差以及各个微型基站之间的 频率偏差在预设的频率阈值范围内。
5404、 目标基站根据第一源基站的同步级别确定目标基站的同步级别。 本发明实施例中, 同步级别可以用来表示各个基站的同步状态,每个同步 级别的基站包括至少一个基站,举例来说,假设宏基站通过全球定位系统获取 同步信息后, 即设置宏基站的同步级别为 0,微型基站 1通过宏基站获得同步信 息后, 微型基站 1的同步级别为 1 , 微型基站 2通过微型基站 1获得同步信息后, 微型基站 2的同步级别为 2, 以此类推, 若宏蜂窝网中的同步级别最高为 L ( L 是大于 0的整数), 则我们可以将该宏蜂窝网称为 L跳同步网络系统。 本发明实 施例中, 如果没有特别说明, 同步级别越小代表着同步精度越高。
本发明实施例中,第一源基站的同步级别可以配置在第一同步信号所在的 子帧中,且目标基站可以通过第一同步信号所在的子帧推测出第一源基站的同 步级别, 并根据第一源基站的同步级别确定出目标基站自身的同步级别, 目标 基站还可以向第一源基站发送用于获取第一源基站的同步级别的请求,以使第 一源基站向目标基站发送第一源基站的同步级别, 本发明实施例不做限定。
举例来说, 若本发明实施例中的第一源基站的同步级别为 M ( M是大于等 于 0的整数), 则目标基站的同步级别为 M+l。
5405、目标基站根据目标基站的同步级别判断目标基站是否满足发送第二 同步信号的条件。 作为一种可选的实施方式,目标基站根据目标基站的同步级别判断目标基 站是否满足发送第二同步信号的条件的具体方式可以为:
目标基站判断目标基站的同步级别是否小于等于预先设置的同步级别,若 目标基站的同步级别小于等于预先设置的同步级别,则确定目标基站满足发送 第二同步信号的条件。
本发明实施例中,预先设置的同步级别可以是由人为规定的,也可以是由 运营商配置的,且预先设置的同步级别可以是回程信令,也可以是目标基站自 身的高层信令, 本发明实施例不做限定。 举例来说, 若正整数 K是标准 /协议规 定的同步级别中的最大值, 且假设同步级别从 0开始以及预先设置的同步级别 为 T, 则同步级别的集合为 {0, 1 , 2, ... , K}, T<K, 且同步级别为 Κ的源基 站不发送同步信号, 即标准 /协议规定的同步级别最大的源基站不发送同步信 本发明实施例中,预先设置的同步级别在设置时需要折中考虑, 即在设置 同步级别时既要保证宏蜂窝网的同步精度又要保证能够减少宏蜂窝网的开销。
举例来说, 假设预先设置的同步级别为 5, 且目标基站的同步级别为 3, 则 可以确定目标基站满足发送第二同步信号的条件。
S406、若确定目标基站满足发送第二同步信号的条件, 目标基站发送第二 同步信号。
作为一种可选的实施方式, 目标基站发送第二同步信号的具体方式可以 为:
目标基站根据目标基站的同步级别选择与目标基站的同步级别对应的同 步信号资源池, 同步信号资源池包括用于发送同步信号的同步信号资源; 目标基站从同步信号资源池中选择与目标基站对应的同步信号资源; 目标基站在与目标基站对应的同步信号资源上发送第二同步信号。
本发明实施例中, 每个同步级别的基站都可以配置一个同步信号资源池, 且每个同步信号资源池可以包括用于发送同步信号的多个同步信号资源。目标 基站可以先根据目标基站的同步级别选择与目标基站的同步级别对应的同步 信号资源池, 然后再根据目标基站的专有参数(如基站标识 Cell ID、 射频拉远 头标识 RHH ID或全球唯一标识等, 本发明实施例不做限定)从与目标基站的 同步级别对应的同步信号资源池中选择与目标基站的参数对应的同步信号资 源发送同步信号,这样就不会存在相邻的两个基站选择相同的同步信号资源发 送相应的同步信号的问题, 有利于提高基站间的同步精度。
本发明实施例中, 每个同步级别对应的同步信号资源池可以周期性的出 现,即在一个周期内每个同步级别对应的同步信号资源池可以按照同步级别的 顺序(从小到大或从大到小, 本发明实施例不做限定)出现所有同步级别对应 的同步信号资源池, 周期值可以预先设置, 如 1秒或 10秒等, 本发明实施例不 做限定。 所有同步级别对应的同步信号资源池可以预先配置在多播 /组播单频 本发明实施例不做限定,且每个同步级别对应的同步信号资源池可以尽可能的 集中在一个子帧或多个子帧中, 即一个同步级别的同步信号资源池是连续的, 这样可以减少基站获取与基站的同步级别对应的同步信号资源池的时间,有效 提高基站的频谱效率。
本发明实施例中,目标基站发送第二同步信号以使接收到第二同步信号的 基站根据接收到的第二同步信号实现与目标基站的时钟同步。
本发明实施例中, 目标基站接收源基站发送的同步信号, 并选择其中一个 同步信号作为第一同步信号,然后根据第一同步信号实现与发送第一同步信号 的第一源基站的时钟同步,再根据第一源基站的同步级别确定目标基站的同步 级别, 之后根据目标基站的同步级别判断是否满足发送第二同步信号的条件, 若确定满足发送第二同步信号的条件, 则发送第二同步信号, 以使接收到第二 同步信号的基站根据接收到的第二同步信号实现与目标基站的时钟同步。实施 本发明实施例可以 站根据其同步级别决定是否发送同步信号,减少了宏蜂 窝网的开销并保证了整个宏蜂窝网的同步性能。 请参阅图 5 ,图 5是本发明实施例公开的另一种实现基站间时钟同步的方法 的流程示意图。如图 5所示, 该实现基站间时钟同步的方法可以包括以下步骤: S501、 目标基站接收源基站发送的同步信号。
本发明实施例中, 源基站可以包括至少一个已实现时钟同步的源基站,且 源基站可以是宏基站, 也可以是微型基站, 本发明实施例不做限定。 若源基站 是宏基站, 则宏基站可以通过全球定位系统( GPS , Global Positioning System ) 获取同步信息, 并将同步信号发送至目标基站; 若源基站是微型基站, 则微型 基站通过接收来自宏基站或上一级别已实现时钟同步的微型基站的同步信号 来实现时钟同步, 并将同步信号发送至目标基站。
本发明实施例中, 同步信号可以是主同步信号、 辅同步信号、 小区特定参 考信号、 信道状态信息参考信号、 多媒体广播多播服务单频网络参考信号、 定 位参考信号以及发现参考信号等, 本发明实施例不做限定。
5502、 目标基站选择同步信号中其中一个同步信号作为第一同步信号。 本发明实施例中, 目标基站可以接收到多个源基站发送的同步信号, 并选 择同步信号中其中一个同步信号作为第一同步信号, 其中, 第一同步信号可以 是目标基站接收到的同步信号中信号强度最强的同步信号,也可以是同步信号 中信号强度超过预设信号强度阈值且同步级别(同步级别越小,同步精度越高) 最小的同步信号,还可以是与目标基站属于相同运营商的基站发送的同步信号 中信号强度最强的同步信号, 本发明实施例不做限定,且同步信号的信号强度 可以通过同步信号的能量或功率来体现,也可以通过利用同步信号测量得到的 参考信号接收功率或参考信号接收质量来体现, 本发明实施例不做限定。
5503、目标基站根据第一同步信号实现与发送第一同步信号的第一源基站 的时钟同步。
本发明实施例中, 时钟同步可以包括时间同步以及频率同步,宏基站与微 型基站之间以及各个微型基站之间实现时间同步可以理解为宏基站与微型基 站之间发送信号的时间偏差以及各个微型基站之间发送信号的时间偏差在预 设的时间阈值范围内;宏基站与微型基站之间以及各个微型基站之间实现频率 同步可以理解为宏基站与微型基站之间的频率偏差以及各个微型基站之间的 频率偏差在预设的频率阈值范围内。
5504、 目标基站向第一源基站发送用于获取第一源基站的同步级别的请 求。
5505、 目标基站接收第一源基站发送的第一源基站的同步级别。
5506、 目标基站根据第一源基站的同步级别确定目标基站的同步级别。 举例来说, 若本发明实施例中的第一源基站的同步级别为 M ( M是大于等 于 0的整数), 则目标基站的同步级别为 M+l。
5507、目标基站根据目标基站的同步级别判断目标基站是否满足发送第二 同步信号的条件。
作为一种可选的实施方式,目标基站根据目标基站的同步级别判断目标基 站是否满足发送第二同步信号的条件的具体方式可以为:
目标基站判断目标基站的同步级别是否小于等于预先设置的同步级别,若 目标基站的同步级别小于等于预先设置的同步级别,则确定目标基站满足发送 第二同步信号的条件。
举例来说, 假设预先设置的同步级别为 5, 且目标基站的同步级别为 3, 则 可以确定目标基站满足发送第二同步信号的条件。
5508、若确定目标基站满足发送第二同步信号的条件, 目标基站发送第二 同步信号。
作为一种可选的实施方式, 目标基站发送第二同步信号的具体方式可以 为:
目标基站根据目标基站的同步级别选择与目标基站的同步级别对应的同 步信号资源池, 同步信号资源池包括用于发送同步信号的同步信号资源; 目标基站从同步信号资源池中选择与目标基站对应的同步信号资源; 目标基站在与目标基站对应的同步信号资源上发送第二同步信号。
本发明实施例中, 每个同步级别的基站都可以配置一个同步信号资源池, 且每个同步信号资源池可以包括用于发送同步信号的多个同步信号资源。目标 基站可以先根据目标基站的同步级别选择与目标基站的同步级别对应的同步 信号资源池, 然后再根据目标基站的专有参数(如基站标识 Cell ID、 射频拉远 头标识 RHH ID或全球唯一标识等, 本发明实施例不做限定)从与目标基站的 同步级别对应的同步信号资源池中选择与目标基站的参数对应的同步信号资 源发送同步信号,这样就不会存在相邻的两个基站选择相同的同步信号资源发 送相应的同步信号的问题, 有利于提高基站间的同步精度。
本发明实施例中,目标基站发送第二同步信号以使接收到第二同步信号的 基站根据接收到的第二同步信号实现与目标基站的时钟同步。
实施本发明实施例可以使基站根据其同步级别决定是否发送同步信号,减 少了宏蜂窝网的开销并保证了整个宏蜂窝网的同步性能。
需要说明的是, 在上述实施例中, 对各个实施例的描述都各有侧重, 某个 实施例中没有详细描述的部分, 可以参见其他实施例的相关描述。 其次, 本领 域技术人员也应该知悉,说明书中所描述的实施例均属于优选实施例, 所涉及 的动作和模块并不一定是本发明所必须的。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、 合并和删 减。
本发明实施例基站中的模块或子模块可以根据实际需要进行合并、划分和 删减。
本发明实施例基站中的接收模块可以是无线接收设备,第一发送模块以及 第二发送模块可以是无线发射设备,选择模块可以是信号处理设备, 时钟同步 模块、 确定模块以及判断模块可以是控制设备等, 本发明实施例不做限定。
本发明实施例中所述模块或子模块, 可以通过通用集成电路, 例如 CPU ( Central Processing Unit, 中央处理器), 或通过 ASIC ( Application Specific Integrated Circuit, 专用集成电路)来实现。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程, 是可以通过计算机程序来指令相关的硬件来完成,所述的程序可存储于计算机 可读取存储介质中, 该程序在执行时, 可包括如上述各方法的实施例的流程。 其中,所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory, ROM )或随机存储记忆体(Random Access Memory, RAM )等。
以上对本发明实施例所提供的一种实现基站间时钟同步的方法及基站行 以上实施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时,对于 本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均 会有改变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种基站, 其特征在于, 包括:
接收模块, 用于接收源基站发送的同步信号, 所述源基站包括至少一个已 实现时钟同步的源基站;
选择模块, 用于选择所述同步信号中其中一个同步信号作为第一同步信 时钟同步模块,用于根据所述第一同步信号实现与发送所述第一同步信号 的第一源基站的时钟同步;
确定模块, 用于根据所述第一源基站的同步级别确定所述基站的同步级 别;
判断模块,用于根据所述基站的同步级别判断所述基站是否满足发送第二 同步信号的条件;
第一发送模块,用于当所述判断模块确定所述基站满足发送第二同步信号 的条件时,发送所述第二同步信号, 以使接收到所述第二同步信号的基站根据 接收到的所述第二同步信号实现与所述基站的时钟同步。
2、 根据权利要求 1所述的基站, 其特征在于, 所述基站还包括: 第二发送模块,用于向所述第一源基站发送用于获取所述第一源基站的同 步级别的请求;
所述接收模块,还用于接收所述第一源基站发送的所述第一源基站的同步 级别。
3、 根据权利要求 1或 2所述的基站, 其特征在于, 所述判断模块具体用于 判断所述基站的同步级别是否小于等于预先设置的同步级别,若所述基站的同 步级别小于等于所述预先设置的同步级别,则确定所述基站满足发送第二同步 信号的条件。
4、 根据权利要求 3所述的基站, 其特征在于, 所述第一发送模块包括选择 子模块以及发送子模块, 其中: 所述选择子模块,用于根据所述基站的同步级别选择与所述基站的同步级 别对应的同步信号资源池,所述同步信号资源池包括用于发送同步信号的同步 信号资源, 并从所述同步信号资源池中选择与所述基站对应的同步信号资源; 所述发送子模块,用于在与所述基站对应的同步信号资源上发送所述第二 同步信号。
5、 一种基站, 包括存储器和处理器, 其特征在于, 所述存储器中存储一 组程序代码,且所述处理器用于调用所述存储器中存储的程序代码, 用于执行 以下操作:
接收源基站发送的同步信号,所述源基站包括至少一个已实现时钟同步的 源基站;
选择所述同步信号中其中一个同步信号作为第一同步信号;
根据所述第一同步信号实现与发送所述第一同步信号的第一源基站的时 钟同步;
根据所述第一源基站的同步级别确定所述基站的同步级别;
根据所述基站的同步级别判断所述基站是否满足发送第二同步信号的条 件;
若确定所述基站满足发送第二同步信号的条件, 则发送所述第二同步信 号,以使接收到所述第二同步信号的基站根据接收到的所述第二同步信号实现 与所述基站的时钟同步。
6、 根据权利要求 5所述的基站, 其特征在于, 所述处理器根据所述第一源 基站的同步级别确定所述基站的同步级别之前,所述处理器调用所述存储器中 存储的程序代码还执行以下操作:
向所述第一源基站发送用于获取所述第一源基站的同步级别的请求; 接收所述第一源基站发送的所述第一源基站的同步级别。
7、 根据权利要求 5或 6所述的基站, 其特征在于, 所述处理器根据所述基 站的同步级别判断所述基站是否满足发送第二同步信号的条件的方式具体为: 判断所述基站的同步级别是否小于等于预先设置的同步级别,若所述基站 的同步级别小于等于所述预先设置的同步级别,则确定所述基站满足发送第二 同步信号的条件。
8、 根据权利要求 7所述的基站, 其特征在于, 所述处理器发送所述第二同 步信号的方式具体为:
根据所述基站的同步级别选择与所述基站的同步级别对应的同步信号资 源池, 所述同步信号资源池包括用于发送同步信号的同步信号资源;
从所述同步信号资源池中选择与所述基站对应的同步信号资源; 在与所述基站对应的同步信号资源上发送所述第二同步信号。
9、 一种实现基站间时钟同步的方法, 其特征在于, 包括:
目标基站接收源基站发送的同步信号,所述源基站包括至少一个已实现时 钟同步的源基站;
所述目标基站选择所述同步信号中其中一个同步信号作为第一同步信号; 所述目标基站根据所述第一同步信号实现与发送所述第一同步信号的第 一源基站的时钟同步;
所述目标基站根据所述第一源基站的同步级别确定所述目标基站的同步 级别;
所述目标基站根据所述目标基站的同步级别判断所述目标基站是否满足 发送第二同步信号的条件;
若确定所述目标基站满足发送第二同步信号的条件,则所述目标基站发送 所述第二同步信号,以使接收到所述第二同步信号的基站根据接收到的所述第 二同步信号实现与所述目标基站的时钟同步。
10、 根据权利要求 9所述的方法, 其特征在于, 所述目标基站根据所述第 一源基站的同步级别确定所述目标基站的同步级别之前, 所述方法还包括: 所述目标基站向所述第一源基站发送用于获取所述第一源基站的同步级 别的请求; 所述目标基站接收所述第一源基站发送的所述第一源基站的同步级别。
11、 根据权利要求 9或 10所述的方法, 其特征在于, 所述目标基站根据所 述目标基站的同步级别判断所述目标基站是否满足发送第二同步信号的条件 包括:
所述目标基站判断所述目标基站的同步级别是否小于等于预先设置的同 步级别, 若所述目标基站的同步级别小于等于所述预先设置的同步级别, 则确 定所述目标基站满足发送第二同步信号的条件。
12、 根据权利要求 11所述的方法, 其特征在于, 所述目标基站发送所述第 二同步信号包括:
所述目标基站根据所述目标基站的同步级别选择与所述目标基站的同步 级别对应的同步信号资源池,所述同步信号资源池包括用于发送同步信号的同 步信号资源;
所述目标基站从所述同步信号资源池中选择与所述目标基站对应的同步 信号资源;
所述目标基站在与所述目标基站对应的同步信号资源上发送所述第二同 步信号。
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