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WO2015109896A1 - 一种实现空口同步的方法、小区和系统 - Google Patents

一种实现空口同步的方法、小区和系统 Download PDF

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Publication number
WO2015109896A1
WO2015109896A1 PCT/CN2014/093506 CN2014093506W WO2015109896A1 WO 2015109896 A1 WO2015109896 A1 WO 2015109896A1 CN 2014093506 W CN2014093506 W CN 2014093506W WO 2015109896 A1 WO2015109896 A1 WO 2015109896A1
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WIPO (PCT)
Prior art keywords
cell
target cell
source
target
information
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PCT/CN2014/093506
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English (en)
French (fr)
Inventor
韩晓钢
苟伟
赵亚军
毕峰
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US15/112,015 priority Critical patent/US10791528B2/en
Priority to EP14880229.1A priority patent/EP3099122B1/en
Publication of WO2015109896A1 publication Critical patent/WO2015109896A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to an air interface synchronization technology in the field of wireless communication, and in particular, to a method, a cell and a system for implementing air interface synchronization.
  • LTE/LTE-A long-term evolution or advanced long-term evolution (LTE/LTE-A) mobile communication systems
  • good synchronization between base stations can achieve better system performance, for example: interference coordination/interference avoidance scenarios, multimedia broadcast multicast services
  • synchronization between base stations is a necessary condition for ensuring the normal operation of these services.
  • a base station providing synchronization information is referred to as a source base station or a source cell
  • a base station receiving synchronization information is referred to as a target base station or a target cell.
  • the synchronization information is a signal, a channel, or the like.
  • the small cell switching mechanism is introduced from the perspective of energy saving and interference reduction of the base station, and the small cell is based on a certain criterion.
  • the moments enter the closed state.
  • the base station cannot normally send the air interface synchronization reference signal, so that the target base station listening to the base station loses synchronization because it cannot detect the normal synchronization reference signal, and then synchronizes with the target base station.
  • the synchronization of the source base station also has an effect.
  • the embodiments of the present invention provide a method, a cell, and a system for implementing air interface synchronization.
  • An embodiment of the present invention provides a method for implementing air interface synchronization, where the method includes:
  • the source cell performs signaling interaction with the target cell, and determines whether the signal is based on the signaling interaction result. shut down.
  • the embodiment of the invention further provides a method for implementing air interface synchronization, the method comprising:
  • the target cell informs the neighboring cell to perform the subframe position information of the air interface synchronization that is being listened to; the subframe position information of the air interface synchronization that performs the listening is configured to notify the neighboring cell to perform silence at the subframe position.
  • the embodiment of the present invention further provides a cell that implements air interface synchronization, where the cell includes: a judgment processing unit configured to perform signaling interaction with the target cell, and determine whether to close according to the signaling interaction result.
  • the embodiment of the present invention further provides a cell that implements air interface synchronization, where the cell includes: a notification unit, configured to notify the neighboring cell to perform the subframe position information of the air interface synchronization that is being listened to; and the subframe position of the air interface synchronization that performs the listening The information is configured to notify the neighboring cell to perform silence at the subframe position.
  • An embodiment of the present invention further provides a system for implementing air interface synchronization, where the system includes: two types of cells as described above.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result.
  • the signaling interaction between the base stations avoids the impact of the closing of the source cell on the air interface synchronization of the target cell, and also enhances the shutdown mechanism of the source cell, so that the energy saving target can be achieved. It will not affect the synchronization of other cells.
  • FIG. 1 is a flowchart of implementing a method for implementing air interface synchronization according to an embodiment of the present invention
  • FIG. 2 is a flowchart of implementing a method for implementing air interface synchronization according to another embodiment of the present invention
  • FIG. 3 is a network topology diagram corresponding to a specific application scenario according to Embodiment 4 of the present invention.
  • FIG. 4 is a schematic structural diagram of a system for implementing air interface synchronization according to an embodiment of the present invention.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, so as to solve the air interface synchronization problem of the target cell after the source cell is closed.
  • FIG. 1 is a flowchart of a method for implementing air interface synchronization according to an embodiment of the present invention. As shown in FIG. 1 , the method includes:
  • Step 101 The source cell performs signaling interaction with the target cell.
  • Step 102 The source cell determines whether to close according to the signaling interaction result.
  • the content of the source cell and the target cell signaling interaction includes at least one of the following:
  • the method for the signaling interaction between the source cell and the target cell is: a periodic interaction mode, or an event-triggered interaction mode, or an interaction mode based on the periodic interaction mode and an event-triggered interaction mode. Combined interaction.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, including:
  • the source cell notifies the target cell of the time information of the source cell entering the closed state, and determines whether to enter the closed state at the predetermined time based on the feedback information of the target cell; the feedback information of the target cell is: the target cell is performing a new air interface synchronization detection Whether to find a new sync source when listening.
  • the source cell determines whether to enter a closed state at a predetermined moment based on the feedback information of the target cell, including:
  • the source cell is at a predetermined level.
  • the closed time enters the closed state; if the feedback information of the target cell is that the new synchronization source cannot be found, the source cell is not allowed to enter the closed state.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, including:
  • the source cell configures a listening subframe of the target cell, and determines whether to close according to the switch state information of the target cell reported by the target cell.
  • the source cell determines whether to close according to the switch state information of the target cell reported by the target cell, including:
  • the source cell enters the shutdown state at the scheduled shutdown time; otherwise, if the target cell subordinate to the source cell is in the on state, some are in the state If the source cell is in the off state, the source cell is not allowed to enter the shutdown state.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, including:
  • the source cell configures the listening subframe of the target cell to ensure that the source cell can be intercepted by the target cell at the listening subframe of the target cell.
  • the ensuring that the source cell can be intercepted by the target cell in the listening subframe of the target cell includes:
  • the source cell remains in the on state, or the source cell changes from the off state to the on state at the listening subframe of the target cell, or the source cell sends an air interface synchronization signal at the listening subframe of the target cell.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, including:
  • the source cell configures the listening subframe of the target cell, and/or the configuration target cell reports the status information to the source cell; the source cell determines whether to enter the closed state according to the status information reported by the target cell.
  • the status information reported by the target cell includes at least one of the following: a target cell Switch state information, subordinate target cell information of the target cell, and candidate synchronization source cell set information of the target cell.
  • the source cell performs signaling interaction with the target cell, and determines whether to close according to the signaling interaction result, including:
  • the source cell configures the monitoring subframe of the target cell, and/or the configuration target cell reports the status information to the source cell; the source cell determines, according to the status information reported by the target cell, whether the target cell needs to switch to a cell in the candidate synchronization source cell set as a new one. Synchronization source cell.
  • the status information reported by the target cell includes at least one of: switch state information of the target cell, subordinate target cell information of the target cell, and candidate synchronization source cell set information of the target cell.
  • the method further includes:
  • the source cell selects a closed state, and performs an operation corresponding to the closed state according to the selection
  • the closed state selected by the source cell includes one of the following:
  • the source cell is completely closed, or the source cell only sends the discovery signal, or the source cell sends the discovery signal and the air interface synchronization reference signal, or the source cell only sends the air interface synchronization reference signal, or the source cell does not send the air interface synchronization reference signal and/or the discovery signal.
  • the feedback state information of the target cell is only monitored, and whether the monitoring subframe position of the target cell is activated based on the feedback state information, or the source cell sends the air interface synchronization reference signal only in the monitoring subframe position of the target cell, and the remaining time is closed.
  • the discovery signal and the air interface synchronization reference signal are a combination of one or two signal forms: a cell-specific reference signal, a channel state indication reference signal, a positioning reference signal, and a newly set dedicated reference signal.
  • the method for interacting configuration information or signaling between the source cell and the target cell includes at least one of the following: a method based on system message configuration, a method based on an inter-base station X2 interface, and a RRC based on a radio resource control protocol.
  • Method of configuration method based on physical layer signaling, A method based on the S1 interface.
  • Another embodiment of the present invention provides a method for implementing air interface synchronization. As shown in FIG. 2, the method includes:
  • Step 201 The target cell notifies the neighboring cell to perform the subframe position information of the air interface synchronization of the listening;
  • Step 202 The neighboring cell performs silence at the subframe position.
  • the method further includes:
  • the target cell performs an air interface synchronous listening attempt on the surrounding available source cells, and notifies the candidate synchronization source cell to its neighboring cell;
  • the candidate synchronization source cell includes: a cell that belongs to the same operator as the target cell, and a cell that belongs to a different carrier from the target cell.
  • the neighboring cell includes a cell that belongs to the same operator as the target cell, and also includes a cell that belongs to a different operator from the target cell.
  • the subframe position information of the air interface synchronization for performing listening is obtained according to the subframe position of the target cell.
  • the signaling interaction between the base stations avoids the impact of the closing of the source cell on the air interface synchronization of the target cell, and also enhances the shutdown mechanism of the source cell, so that the energy saving target can be achieved. It will not affect the synchronization of other cells.
  • the method in the embodiment of the present invention may adopt multiple implementation manners in the implementation process, and at least include one of the following methods:
  • the source cell notifies the target cell of the information of the closing time on the listening subframe of the target cell, and the target cell performs a new air interface synchronous listening attempt in the closing time of the source cell, and
  • the source cell is fed back to the source cell according to the feedback information of the target cell, for example, if the target cell feedback can find a new synchronization source, the source cell is scheduled to be closed. Always enter the closed state, If the target cell feedback cannot find a new synchronization source, the source cell delays to enter the shutdown state at a predetermined shutdown, that is, delays the shutdown, or the source cell decides not to enter the shutdown state;
  • the signaling interaction between the source cell and the target cell is abnormal. For example, part of the target cell does not receive the information of the closing time notified by the source cell due to loss of synchronization with the source cell; or the target cell correctly receives the information. Information, but when the feedback to the source cell is used to find out whether the new synchronization source information is found, the source cell is out of synchronization. In the above two abnormal situations, if the source cell does not receive feedback information of all the target cells within a predetermined time, then Correlated processing is performed according to the target cell not finding a new synchronization source.
  • the source cell configures a listening subframe of the target cell based on its own resource load status and its own synchronization level information, and the target cell monitors the air interface synchronization reference sent by the source cell in the configured monitoring subframe position.
  • the target cell reports its switch state information to the source cell; if the target cell subordinate to the source cell is in the closed state, and the source cell is about to enter the closed state, the source cell enters the closed state at the scheduled shutdown time; otherwise, if the source cell If the target cell of the subordinate is in the open state, and some of the target cells are in the closed state, and the source cell is about to enter the closed state, the source cell decides to delay entering the closed state at the scheduled closing time, or decides not to enter the closed state.
  • the source cell configures a listening subframe of the target cell based on its own resource load status and its own synchronization level information, and the target cell monitors the air interface synchronization reference sent by the source cell in the configured monitoring subframe position.
  • the signal the source cell enters the off state at a predetermined off time regardless of the switching state of the target cell, and wakes up at the subframe position monitored by the target cell, and sends an air interface synchronization reference signal.
  • the source cell configures the monitoring subframe information of the target cell, and configures the target cell to report the status information to the source cell, and the status information reported by the target cell includes at least one of the following: switch state information of the target cell.
  • the source cell configures the monitoring subframe information of the target cell, and configures the target cell to report the status information to the source cell, and the status information reported by the target cell includes at least one of the following: switch state information of the target cell.
  • the source cell selects an appropriate closed state and performs the operation of the closed state.
  • the off state selected by the source cell includes: 1) the source cell is completely closed; 2) the source cell only sends the discovery signal (DS); 3) the source cell sends the DS and the air interface synchronization reference signal; 4) the source cell only sends the air interface synchronization.
  • the source cell does not send the air interface synchronization reference signal/discovery signal, monitors the feedback state information of the target cell, determines whether to activate the monitoring subframe position of the target cell based on the feedback state information; 6) the source cell is only in the target cell
  • the listening subframe position transmits the air interface synchronization reference signal, and is turned off at the rest of the target cell's listening subframe position.
  • the discovery signal and the air interface synchronization reference signal may be a combination of the following signal forms: a cell-specific reference signal (CRS), a channel state indication reference signal (CSI-RS), a positioning reference signal (PRS), and a newly set dedicated reference signal;
  • the configuration period of the discovery signal and the air interface synchronization reference signal and the transmission subframe position may be configured the same or different configurations.
  • the target cell performs an air interface synchronous listening attempt on the neighboring available source cell, where the available source cell includes the same carrier cell, that is, the same carrier as the target cell, and includes a cell of a different operator, that is, a carrier that is different from the target cell; the target cell notifies the neighboring cell of the neighboring cell that is corresponding to the neighboring cell when the candidate synchronization source cell is monitored, and the monitoring candidate synchronizes the source cell
  • the corresponding monitoring subframe position information can also be understood as the optimal subframe position when the target cell performs air interface discovery of the synchronization source cell;
  • the cell and the target cell belong to the same carrier or belong to different operators.
  • the cells in the candidate synchronization source also belong to the set of neighboring cells; based on the interaction between the target cell and the neighboring cell, the neighboring cell and the target cell are in the target.
  • the location of the listening subframe of the cell is coordinated to avoid interference to the target cell that is being monitored by the air interface. For example, in a scenario where the adjacent carrier is in a different frequency band, the cells belonging to different operators negotiate which cells are coordinated at which time/subframe. And listening, other neighboring cells that may interfere with these moments/subframes perform operations such as muting.
  • the method for configuring configuration information or signaling of the source cell and the target cell mentioned in the foregoing manner includes at least one of the following: a method based on system message configuration, a method based on an inter-base station X2 interface, and a radio resource control protocol (RRC) a method of signaling configuration, a method based on physical layer signaling, and a method based on an S1 interface;
  • RRC radio resource control protocol
  • the method based on the system message configuration is implemented by configuring the relevant domain of the LTE SIB message, reusing the domain in the original SIB message, or introducing a new SIB message domain; and based on the method of inter-base station X2 interface, in a base station and phase Established between a plurality of neighboring base stations, and exchanges signaling information when needed; the method based on the RRC connection establishment or the reconfiguration of the RRC connection is used to perform related signaling interaction; the physical layer based signaling method, The air interface synchronization related signaling is exchanged through physical layer control signaling, such as DCI; based on the S1 interface method, communication between the base stations needs to be implemented by a mobility management entity (MME), for example, HeNB_1 sends the target eNB ID to the MME.
  • MME mobility management entity
  • the message of the synchronization information request is sent by the MME to the target eNB ((H)eNB_2) through the related message.
  • eNB_2 After receiving the message, eNB_2 responds to the MME by using related information, and the response message includes its own synchronization layer number and synchronization status information.
  • the signaling interaction between the source cell and the associated target cell mentioned in the foregoing manner includes at least one of the following: switch state information of the source cell, switch state information of the target cell, whether the target cell finds a new synchronization source cell, and the source Time information of the cell entering the closed state, candidate synchronization source cell set information of the target cell, and target cell information of the subordinate associated with the target cell.
  • the method for signaling interaction between the source cell and the target cell mentioned in the foregoing manner may be based on weeks. Inter-personal interaction, or the way in which events are triggered based on event triggering, or based on a combination of two ways.
  • the listening subframe position of the target cell is [SF2, RF3], and the period is T. It is assumed that the current time t1 is just the listening subframe position of the target cell, and the source cell is listening in the target cell at this time.
  • the time information on the subframe that informs the target cell that it is closed is t2, that is, the source cell will enter the closed state at time t2, and the target cell performs a new air interface synchronous listening attempt during the time period from t1 to t2, and will find
  • the information such as the new synchronization source is fed back to the source cell, and the source cell determines whether it can be closed based on the feedback information of the target cell.
  • the source In the time period from t1 to t2, if the target cell feedback can find a new synchronization source, the source The cell enters the closed state at the predetermined closing time t2; otherwise, the source cell is delayed in the predetermined closing time t2, or the source cell decides not to enter the closed state. .
  • the listening subframe position of the target cell is [SF2, RF3], and the period is T.
  • the target cell monitors the air interface synchronization reference signal sent by the source cell at the monitoring subframe position, and the target cell periodically
  • the ground station reports its switch state information to the source cell; the source cell learns the number and state of its subordinate target cell through the interaction between the target cell and the source cell, and assumes that the source cell is about to enter the off state at time t2, and the target cell subordinate target at this time If the cell is in the closed state, the source cell enters the closed state at the predetermined closing time t2.
  • the source cell is delayed in the scheduled closing time t2.
  • the source cell still enters the closed state at the predetermined closing time t2, but wakes up in the subframe position [SF2, RF3] monitored by the target cell, and sends the air interface synchronization. Reference signal.
  • the listening subframe position of the target cell is [SF2, RF3], and the period is T.
  • the target cell monitors the air interface synchronization reference signal sent by the source cell at the monitoring subframe position, and the target cell periodically
  • the source cell reports its status information, and the status information reported by the target cell includes at least one of the following: switch state information of the target cell, target cell information of the target cell, and candidate synchronization source cell set information of the target cell.
  • the candidate synchronization source cell set information reported by the target cell includes the source cell, and for a certain number of subordinate target cells, the source cell is the only candidate synchronization source. That is, after the source cell is closed, the target cells cannot find a suitable synchronization source, and the source cell decides that it cannot enter the shutdown state based on the reported status information.
  • the initial synchronization source of cell3 is cell1
  • the source cell configures the monitoring subframe information of the target cell
  • the target cell performs autonomously or periodically configures the source cell to perform periodic new synchronization source cell discovery, and configures the target.
  • the cell reports the status information to the source cell, and the status information reported by the target cell includes at least one of the following: switch state information of the target cell, target cell information of the target cell, and candidate synchronization source cell set information of the target cell.
  • cell3 reports candidate synchronization source cell set information to cell1, assuming that cell1 enters a closed state at time t1, cell3 selects a new synchronization source cell2 in the candidate synchronization source cell set, and the target cell cell3 performs periodic new synchronization.
  • the discovery of the source cell assume that cell 1 is re-activated and enters the on state at time t2, and cell 3 finds that cell1 can serve as its candidate synchronization source cell in the process of performing periodic synchronization source cell discovery, and cell3 feeds this information back to the source cell.
  • the synchronization level of the synchronization source cell cell2 is 4, and the synchronization level of the original synchronization source cell 1 is 2, the cell 2 notifies the cell 3 to perform the handover operation of the synchronization source cell, and notifies the related information of the new synchronization source cell1.
  • Cell3 will listen to the reference signal of cell1 synchronously listening to the air interface at the new listening subframe time to complete the air interface synchronization.
  • cell1 (which may be a candidate source cell for cell3) is activated and will The activation information notifies the cell 3. After the cell 3 receives the notification, the cell 3 performs a process of reselecting the synchronization source cell.
  • the listening subframe position of the target cell is [SF2, RF3] and the period is T. It is assumed that the current time t1 is just the listening subframe position of the target cell, and the source cell will enter the closing at time t2. State, t2>t1, and t2-t1 ⁇ T, the source cell entering the closed state does not send the air interface synchronization reference signal/discovery signal, and listens to the feedback state information of the target cell; at the next listening time t1+T of the target cell, the target The cell can't hear the air interface synchronization reference of the source cell.
  • the target cell triggers a new air interface synchronization listening attempt, and feeds back information such as a new synchronization source to the source cell.
  • the source cell is based on the feedback information of the target cell. To determine whether it needs to activate the transmitting air interface synchronization reference signal or the discovery signal. For example, during the period of t1+T and t1+2T, if the target cell feedback can find a new synchronization source, the source cell continues to be in the off state; otherwise The source cell is activated at time t1+NT (N is greater than or equal to 2), and sends an air interface synchronization reference signal or a discovery signal for the target cell to perform air interface listening, and at other times Still closed.
  • N is greater than or equal to 2
  • the available closed state of the source cell includes one or more of the following: 1) the source cell is completely shut down; 2) the source cell only sends the discovery signal (DS); 3) the source cell sends the DS and uses Synchronizing the reference signal to the air interface; 4) the source cell only transmits the air interface synchronization reference signal; 5) the source cell does not send the air interface synchronization reference signal/discovery signal, monitors the feedback state information of the target cell, and determines whether the listener in the target cell is based on the feedback information.
  • the frame position transmits the air interface synchronization reference signal; 6) the source cell transmits the air interface synchronization reference signal only at the monitoring subframe position of the target cell, and is turned off at other times;
  • the source cell monitors the state information fed back by the target cell during the off time, for example, whether the target cell finds a new synchronization source, and If the target cell does not find a new synchronization source, the source cell is completely closed in the subframe other than the target cell listening subframe, and the air interface synchronization reference signal/discovery signal is not sent, but only in the monitoring subframe position of the target cell. Air interface synchronization reference signal.
  • the target cell is a small cell of carrier A.
  • the target cell performs an air interface synchronous listening attempt on the neighboring available source cells, and the available source cell includes the same carrier cell and the cell of the different operator; the target cell will notify the corresponding monitoring source cell when the candidate synchronization source cell is intercepted.
  • the monitoring subframe position information is based on the target cell; the candidate synchronization source cell is assumed to be ⁇ A1, A2, B1 ⁇ , where A1 and A2 belong to the small cell of the operator A, and the B1 belongs to the operator.
  • the small cell of B the neighboring cell notified by the target cell includes both the cell of the same operator and the cell of different operators, and the candidate synchronization source cell is also in the set of neighboring cells, based on the interaction between the neighboring cell and the target cell.
  • Information, interference coordination operation between the target cell and the neighboring cell for example, it is negotiated which cells are at which time/subframe to coordinate and listen, and other neighbors that may interfere
  • the cell performs Muting and other operations at these time/subframes, and assumes that the target cell listens to the subframe of the candidate source cell B1 as [SF4, RF4], and the neighboring cell that may interfere with the target cell by negotiation is in the subframe [SF4, RF4]. Muting is always performed, so that the target cell does not suffer from the interference of neighboring cells when listening to the cells of other operators.
  • the listening subframe position of the target cell is [SF2, RF3] and the period is T. It is assumed that the synchronization source cell of the target cell enters the closed state at time t1, and t2 is the listening subframe of the target cell.
  • the possible operations of the source cell are: 1) the source cell is completely closed; 2) the source cell only sends the discovery signal (DS); 3) the source cell sends the DS and uses Synchronizing the reference signal to the air interface; 4) the source cell only transmits the air interface synchronization reference signal; 5) The source cell does not send the air interface synchronization reference signal/discovery signal, monitors the feedback state information of the target cell, and determines whether to send the air interface synchronization reference signal in the monitoring subframe position of the target cell based on the feedback information; 6) the source cell is only in the target cell The listening sub-frame position sends an air interface synchronization reference signal, and is turned off at other times;
  • the discovery signal and the air interface synchronization reference signal may be a combination of the following signal forms: a cell-specific reference signal (CRS), a channel state indication reference signal (CSI-RS), a positioning reference signal (PRS), and a newly set dedicated reference. a signal; wherein, regarding the combined form, the discovery signal and the air interface synchronization reference signal form may be the same, for example, the same as the CRS, or the same as the CSI-RS, or the same as the PRS, or a different signal form, when the signal and the air interface synchronization reference are found.
  • the configuration period of the discovery signal and the air interface synchronization reference signal and the transmission subframe position may be configured the same or different configurations.
  • the target cell is a small cell of carrier A.
  • the target cell performs an air interface synchronous listening attempt on the neighboring available source cells, and the available source cell includes the same carrier cell and the cell of the different operator; the target cell will notify the corresponding monitoring source cell when the candidate synchronization source cell is intercepted.
  • the monitoring subframe position information is based on the target cell; the candidate synchronization source cell is assumed to be ⁇ A1, A2, B1 ⁇ , where A1 and A2 belong to the small cell of the operator A, and the B1 belongs to the operator.
  • the small cell of B the neighboring cell notified by the target cell is the same cell as the operator of the target cell, and based on the information exchanged between the neighboring cell and the target cell, the interference coordination operation is performed between the target cell and the neighboring cell, for example, which cells are negotiated At which time/subframe to coordinate and listen, other neighboring cells that may interfere with each other perform Muting and other operations at these time/subframes, assuming target cell listening candidates Subframe of the cell B1 [SF4, RF4], through negotiation, the target cell may cause interference to neighboring cells (cells of operator A) in a subframe [SF4, RF4] time for Muting.
  • the target cell is listening to other operators' small
  • the listening performance is degraded
  • the interaction mode between the target cell and the neighboring cell may be implemented by at least one of the following: a method based on system message configuration, a method based on an inter-base station X2 interface, A method based on Radio Resource Control Protocol (RRC) signaling configuration, a method based on physical layer signaling, and a method based on an S1 interface.
  • RRC Radio Resource Control Protocol
  • the embodiment of the present invention further provides a cell 40 for implementing air interface synchronization.
  • the method includes a determination processing unit 401 configured to perform signaling interaction with a target cell, and determine whether to close according to the signaling interaction result.
  • the determining processing unit 401 is configured to notify the target cell of the time information of the cell entering the closed state, and determine, according to the feedback information of the target cell, whether to enter the closed state at a predetermined time; the target cell
  • the feedback information is: whether the target cell finds a new synchronization source when performing new air interface synchronization listening.
  • the determining processing unit 401 is configured to configure a listening subframe of the target cell, and determine whether to close according to the switch state information of the target cell reported by the target cell.
  • the determining processing unit 401 is configured to configure a listening subframe of the target cell to ensure that the cell can be intercepted by the target cell at the listening subframe of the target cell.
  • the determining processing unit ensures that the cell can be intercepted by the target cell in the listening subframe of the target cell, including:
  • the judgment processing unit ensures that the cell remains on, or ensures that the cell changes from a closed state to an open state at a listening subframe of the target cell, or ensures that the cell transmits an air interface synchronization signal at a listening subframe of the target cell.
  • the determining processing unit 401 is configured to configure a listening subframe of the target cell, and/or configure the target cell to report the status information to the cell; and determine whether to enter the closed state according to the status information reported by the target cell.
  • the status information reported by the target cell includes at least one of the following: switch state information of the target cell, target cell information of the target cell, and candidate synchronization source cell set of the target cell. information.
  • the determining processing unit 401 is configured to configure a listening subframe of the target cell, and/or configure the target cell to report status information to the cell; and determine, according to the status information reported by the target cell, whether the target cell needs Switching to one cell in the candidate synchronization source cell set as a new synchronization source cell.
  • the determining processing unit 401 is further configured to: the cell selects a closed state, and performs an operation corresponding to the closed state according to the selection;
  • the closed state selected by the source cell includes one of the following:
  • the cell is completely shut down, or the cell only sends a discovery signal, or the cell sends a discovery signal and an air interface synchronization reference signal, or the cell only sends an air interface synchronization reference signal, or the cell does not send an air interface synchronization reference signal and And/or the discovery signal, only listening to the feedback status information of the target cell, determining whether to activate the monitoring subframe position of the target cell based on the feedback status information, or sending the air interface synchronization reference only in the monitoring subframe position of the target cell. Signal, the rest of the time is off.
  • the determination processing unit 401 can pass through a central processing unit (CPU), a digital signal processor (DSP), or a field-programmable gate array (FPGA) in the cell 40. achieve.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • the embodiment of the present invention further provides a cell 50 for implementing air interface synchronization.
  • the method includes: a notification unit 501, configured to notify a neighboring cell to perform subframe information of the air interface synchronization that is listened to by the neighboring cell;
  • the slot location information of the air interface synchronization is configured to notify the neighboring cell to perform silence at the subframe position.
  • the notification unit 501 is further configured to perform an air interface synchronization listening attempt on the neighboring available source cell, and notify the neighboring cell of the candidate synchronization source cell to the neighboring cell;
  • the candidate synchronization source cell includes: a cell that belongs to the same operator as the cell, and a cell that belongs to a different carrier from the cell.
  • the neighboring cell includes a cell that belongs to the same operator as the cell, and also includes a cell that belongs to a different operator from the cell.
  • the subframe position information of the air interface synchronization for performing listening is obtained according to the subframe position of the cell.
  • the notification unit 501 can be implemented by using a CPU, a DSP, or an FPGA in the cell 50.
  • the embodiment of the invention further provides a system for implementing air interface synchronization, the system comprising: the cell 40 and the cell 50 described above.
  • the signaling interaction between the base stations avoids the impact of the closing of the source cell on the air interface synchronization of the target cell, and also enhances the shutdown mechanism of the source cell, so that the energy saving target can be achieved. It will not affect the synchronization of other cells.
  • the candidate synchronization source cell or the candidate synchronization source cell set in this specification may include one or more cells, for example, the case where the preferred synchronization source cell in Embodiments 7 and 9 is one cell.
  • the source cell currently being monitored by the target cell in this specification is also included in the candidate synchronization source cell of the target cell or the candidate synchronization source cell set information.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明公开了一种实现空口同步的方法，该方法包括：源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。所述源小区与目标小区信令交互的内容包括以下至少之一：源小区的开关状态信息、目标小区的开关状态信息、目标小区是否找到新的同步源、源小区进入关闭状态的时刻信息、目标小区的候选同步源小区集信息、目标小区关联的下属的目标小区信息。本发明还同时公开了一种实现空口同步的小区和系统。

Description

一种实现空口同步的方法、小区和系统 技术领域
本发明涉及无线通信领域中的空口同步技术，尤其涉及一种实现空口同步的方法、小区和系统。
背景技术
在长期演进或先进的长期演进(简称LTE/LTE-A)移动通信系统中，基站之间的良好同步可获得更好的系统性能，例如：在干扰协调/干扰避免场景、多媒体广播多播业务，以及载波聚合等场景中，基站之间的同步是保证这些业务正常运营的必要条件。在基站之间进行同步的过程中，提供同步信息的基站称为源基站或源小区，接收同步信息的基站称为目标基站或目标小区。其中，所述同步信息为信号、或信道等。
在LTE/LTE-A小小区(small cell)的部署中，特别是高密度的small cell部署下，从基站节能和降低干扰的角度考虑，引入了small cell开关机制，small cell基于一定准则在某个时刻进入关闭状态，在关闭过程中，基站不能正常发送空口同步参考信号，这样，侦听该基站的目标基站由于不能检测到正常的同步参考信号就失去了同步，进而对以目标基站为同步源的基站的同步也产生了影响。
发明内容
为解决现有存在的技术问题，本发明实施例提供一种实现空口同步的方法、小区和系统。
本发明实施例提供了一种实现空口同步的方法，该方法包括：
源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否 关闭。
本发明实施例还提供了一种实现空口同步的方法，该方法包括：
目标小区通知邻小区自己执行听的空口同步的子帧位置信息；所述执行听的空口同步的子帧位置信息配置为通知邻小区在所述子帧位置执行静默。
本发明实施例还提供了一种实现空口同步的小区，该小区包括：判断处理单元，配置为进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。
本发明实施例还提供了一种实现空口同步的小区，该小区包括：通知单元，配置为通知邻小区自己执行听的空口同步的子帧位置信息；所述执行听的空口同步的子帧位置信息配置为通知邻小区在所述子帧位置执行静默。
本发明实施例还提供了一种实现空口同步的系统，该系统包括：上文所述的两种小区。
本发明实施例提供的实现空口同步的方法、小区和系统，源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。本发明实施例通过基站之间的信令交互，避免了源小区的关闭对目标小区的空口同步造成的影响，而且也增强了源小区的关闭机制，使其既能达到节能的目地，同时也不会对其他小区的同步产生影响。
附图说明
在附图(其不一定是按比例绘制的)中，相似的附图标记可在不同的视图中描述相似的部件。具有不同字母后缀的相似附图标记可表示相似部件的不同示例。附图以示例而非限制的方式大体示出了本文中所讨论的各个实施例。
图1为本发明实施例的实现空口同步的方法实现流程图；
图2为本发明另一实施例的实现空口同步的方法实现流程图；
图3为本发明实施例四所述具体应用场景对应的网络拓扑图；
图4为本发明实施例实现空口同步的系统结构示意图。
具体实施方式
本发明的实施例中：源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，以解决源小区关闭后目标小区的空口同步问题。
图1为本发明实施例的实现空口同步的方法实现流程图，如图1所示，包括：
步骤101：源小区进行与目标小区间的信令交互；
步骤102：源小区根据信令交互结果确定是否关闭。
其中，所述源小区与目标小区信令交互的内容包括以下至少之一：
源小区的开关状态信息、目标小区的开关状态信息、目标小区是否找到新的同步源、源小区进入关闭状态的时刻信息、目标小区的候选同步源小区集信息、目标小区关联的下属的目标小区信息。
其中，所述源小区与目标小区信令交互的方式为：基于周期性的交互方式，或者基于事件触发的交互方式，或者基于所述周期性的交互方式与事件触发的交互方式两种方式相结合的交互方式。
在一个实施例中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
源小区向目标小区通知源小区进入关闭状态的时刻信息，并基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态；所述目标小区的反馈信息为：目标小区在进行新的空口同步侦听时是否找到新的同步源。
其中，所述源小区基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态，包括：
若目标小区的反馈信息为已找到新的同步源，则源小区就在预定的关 闭时刻进入关闭状态；若目标小区的反馈信息为不能找到新的同步源，则源小区就不允许进入关闭状态。
在一个实施例中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
源小区配置目标小区的监听子帧，并依据目标小区上报的目标小区的开关状态信息确定是否关闭。
其中，所述源小区依据目标小区上报的目标小区的开关状态信息确定是否关闭，包括：
若源小区下属的目标小区都处于关闭状态，且源小区即将进入关闭状态，则源小区在预定的关闭时刻进入关闭状态；否则，若源小区下属的目标小区有的处于开启状态，有的处于关闭状态的，且源小区即将进入关闭状态，则源小区就不允许进入关闭状态。
在一个实施例中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
源小区配置目标小区的监听子帧，确保源小区在目标小区的监听子帧处能被目标小区侦听。
其中，所述确保源小区在目标小区的监听子帧处能被目标小区侦听，具体包括：
源小区保持开启状态，或者源小区在目标小区的监听子帧处从关闭状态变为开启状态，或者源小区在目标小区的监听子帧处发送空口同步信号。
在一个实施例中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
源小区配置目标小区的监听子帧，和/或配置目标小区向源小区上报状态信息；源小区依据目标小区上报的状态信息确定是否进入关闭状态。
其中，所述目标小区上报的状态信息包括以下至少之一：目标小区的 开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。
在一个实施例中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
源小区配置目标小区的监听子帧，和/或配置目标小区向源小区上报状态信息；源小区依据目标小区上报的状态信息，决定目标小区是否需要切换到候选同步源小区集中的一个小区作为新的同步源小区。
其中，所述目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。
在一个实施例中，该方法还包括：
所述源小区选择关闭状态，并依据选择执行所述关闭状态对应的操作；
其中，所述源小区所选择的关闭状态包括以下之一：
源小区完全关闭、或者源小区仅发送发现信号、或者源小区发送发现信号和空口同步参考信号、或者源小区仅发送空口同步参考信号、或者源小区不发送空口同步参考信号和/或发现信号，仅监听目标小区的反馈状态信息，基于所述反馈状态信息决定是否在目标小区的监听子帧位置进行激活，或者源小区仅在目标小区的监听子帧位置发送空口同步参考信号，其余时刻关闭。
其中，所述发现信号和空口同步参考信号为以下一种或两种信号形式的组合：小区专用参考信号，信道状态指示参考信号，定位参考信号，新设置的专用参考信号。
在上述实施例中，所述源小区与目标小区间配置信息或信令的交互方法包含以下至少之一：基于系统消息配置的方法、基于基站间X2接口的方法、基于无线资源控制协议RRC信令配置的方法、基于物理层信令的方法、 基于S1接口的方法。
本发明实施例还提供了另一种实现空口同步的方法，如图2所示，该方法包括：
步骤201：目标小区通知邻小区自己执行听的空口同步的子帧位置信息；
步骤202：邻小区在所述子帧位置执行静默。
在一个实施例中，该方法还包括：
目标小区对周边可用源小区进行空口同步侦听尝试，将候选的同步源小区通知给自己的邻小区；
其中，所述候选同步源小区包括：与所述目标小区属于相同运营商的小区，也包括与所述目标小区属于不同运营商的小区。
其中，所述邻小区包括与所述目标小区属于相同运营商的小区，也包括与所述目标小区属于不同运营商的小区。
其中，所述执行听的空口同步的子帧位置信息是依据目标小区的子帧位置得出的。
本发明实施例通过基站之间的信令交互，避免了源小区的关闭对目标小区的空口同步造成的影响，而且也增强了源小区的关闭机制，使其既能达到节能的目地，同时也不会对其他小区的同步产生影响。
本发明实施例所述方法在实现过程中可采用多种实现方式，至少包含以下方式之一：
方式一：在本发明实施例中，源小区在目标小区的监听子帧上向目标小区通知其关闭时刻的信息，在源小区的关闭时刻内，目标小区进行新的空口同步侦听尝试，并将是否找到新的同步源等信息向源小区进行反馈，源小区基于目标小区的反馈信息来确定是否可以关闭，例如：若目标小区反馈可以找到新的同步源，则源小区就在预定的关闭时刻进入关闭状态， 若目标小区反馈不能找到新的同步源，则源小区就在预定的关闭刻推迟进入关闭状态，即延迟关闭，或者源小区决定不进入关闭状态；
在这种方式下，假设源小区和目标小区的信令交互出现异常，例如：部分目标小区由于和源小区失去同步而没有收到源小区通知的关闭时刻的信息；或者目标小区正确接收到该信息，但是在向源小区进行反馈是否找到新的同步源信息时与源小区失去同步，在上述两种异常情况下，如果源小区在预定时间内，没有收到所有目标小区的反馈信息，则按照目标小区没有找到新的同步源进行相关处理。
方式二：在本发明实施例中，源小区基于自己的资源负荷状况和自己对应的同步层级信息配置目标小区的监听子帧，目标小区在配置的监听子帧位置监听源小区发送的空口同步参考信号，目标小区向源小区上报其开关状态信息；若源小区下属的目标小区都处于关闭状态，且源小区即将进入关闭状态，则源小区在预定的关闭时刻进入关闭状态，否则，若源小区下属的目标小区有的处于开启状态，有的处于关闭状态的，且源小区即将进入关闭状态，则源小区决定在预定的关闭时刻推迟进入关闭状态，或者决定不进入关闭状态。
方式三：在本发明实施例中，源小区基于自己的资源负荷状况和自己对应的同步层级信息配置目标小区的监听子帧，目标小区在配置的监听子帧位置监听源小区发送的空口同步参考信号，源小区不管目标小区开关状态，在预定的关闭时刻进入关闭状态，且在目标小区监听的子帧位置唤醒，发送空口同步参考信号。
方式四：在本发明实施例中，源小区配置目标小区的监听子帧信息，并配置目标小区向源小区上报状态信息，目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息；源小区依据目标小区上报的状态信息， 决定自己是否可以进入关闭状态；
方式五：在本发明实施例中，源小区配置目标小区的监听子帧信息，并配置目标小区向源小区上报状态信息，目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息；源小区依据目标小区上报的状态信息，决定目标小区是否需要切换到候选同步源小区集合中的某个小区作为新的同步源小区；
方式六：在本发明实施例中，源小区选择合适的关闭状态，并执行所述关闭状态的操作。其中，源小区所选择的关闭状态包括：1)源小区完全关闭；2)源小区仅仅发送发现信号(DS)；3)源小区发送DS和空口同步参考信号；4)源小区仅发送空口同步参考信号；5)源小区不发送空口同步参考信号/发现信号，监听目标小区的反馈状态信息，基于反馈状态信息决定是否在目标小区的监听子帧位置进行激活；6)源小区仅在目标小区的监听子帧位置发送空口同步参考信号，而在目标小区的监听子帧位置之外的其余时刻关闭。
所述发现信号和空口同步参考信号可能为以下信号形式的组合：小区专用参考信号(CRS)，信道状态指示参考信号(CSI-RS)，定位参考信号(PRS)，新设置的专用参考信号；其中，发现信号和空口同步参考信号的配置周期及发送子帧位置可配置相同，也可配置不同。
方式七：在本发明实施例中，目标小区对周边可用源小区进行空口同步侦听尝试，所述可用源小区包括同运营商小区，即：与所述目标小区属于相同的运营商，也包括异运营商的小区，即：与所述目标小区属于不同的运营商；目标小区将监听候选同步源小区时对应的监听子帧位置信息通知给自己的邻小区，所述监听候选同步源小区时对应的监听子帧位置信息也可理解为目标小区进行空口发现所述同步源小区时的最佳子帧位置；邻 小区和目标小区属于相同的运营商，或者属于不同的运营商，当然，候选同步源中的小区也属于邻小区的集合内；基于目标小区和邻小区间的交互，邻小区和目标小区在目标小区的监听子帧位置进行协调，避免对正在空口同步监听的目标小区产生干扰，例如：在异运营商相邻频段场景，属于不同运营商的小区会协商哪些小区在哪个时刻/子帧进行协调和侦听，其它可能干扰的邻小区在这些时刻/子帧作静默(Muting)等操作。
其中，上述方式中提到的源小区和目标小区的配置信息或信令的交互方法包含以下至少之一：基于系统消息配置的方法、基于基站间X2接口的方法、基于无线资源控制协议(RRC)信令配置的方法、基于物理层信令的方法、基于S1接口的方法；
其中，基于系统消息配置的方法通过配置LTE SIB消息的相关域来实现，可重用原有SIB消息中的域，或者引入新的SIB消息域；基于基站间X2接口的方法，在一个基站与相邻的若干基站间建立，在需要时交换信令信息；基于无线资源控制协议信令配置的方法利用RRC连接建立或者连接重配置时进行相关信令的交互；基于物理层的信令的方法，通过物理层控制信令，例如DCI来交换空口同步相关信令；基于S1接口的方法，基站间的通信需通过移动性管理实体(MME)来实现，例如：HeNB_1向MME发送包含目标eNB ID和同步信息请求的消息，MME将该请求通过相关消息发送给目标eNB((H)eNB_2)。(H)eNB_2接收到该消息后，通过相关信息对MME进行应答，应答消息中包含自身的同步层数和同步状态信息。
其中，上述方式中提到的源小区和关联的目标小区的信令交互包括以下至少之一：源小区的开关状态信息，目标小区的开关状态信息，目标小区是否找到新的同步源小区，源小区进入关闭状态的时刻信息，目标小区的候选同步源小区集信息，目标小区关联的下属的目标小区信息。
其中，上述方式中提到的源小区和目标小区信令交互的方式可基于周 期性交互方式，或者基于事件触发进行交互的方式，或者基于两种方式结合的交互方式。
下面结合具体应用场景对本发明实施例所述方法进行详细描述。
实施例一
在小小区的部署场景下，假设目标小区的监听子帧位置为[SF2，RF3]，周期为T,假设当前时刻t1刚好为目标小区的监听子帧位置，此时源小区在目标小区的监听子帧上向目标小区通知其关闭的时刻信息为t2，即源小区将在t2时刻进入关闭状态，在t1到t2的时间段内，目标小区进行新的空口同步侦听尝试，并将是否找到新的同步源等信息向源小区进行反馈，源小区基于目标小区的反馈信息来确定是否可以关闭，例如：在t1到t2的时间段内，若目标小区反馈可以找到新的同步源，则源小区就在预定的关闭时刻t2进入关闭状态；否则，源小区就在预定的关闭刻t2延迟关闭，或者源小区决定不进入关闭状态。。
实施例二
在小小区的部署场景下，假设目标小区的监听子帧位置为[SF2，RF3],周期为T,目标小区在监听子帧位置监听所述源小区发送的空口同步参考信号，目标小区周期性地向源小区上报其开关状态信息；通过目标小区和源小区的交互，源小区获知其下属目标小区的数目及状态，假设源小区即将在t2时刻进入关闭状态，且此时源小区下属的目标小区都处于关闭状态，则源小区就会在预定的关闭时刻t2进入关闭状态，否则，若源小区下属的目标小区没有完全处于关闭状态，则源小区就会在预定的关闭时刻t2延迟关闭，或者，在源小区下属的目标小区没有完全处于关闭状态情形下，源小区仍在预定的关闭时刻t2进入关闭状态，但在目标小区监听的子帧位置[SF2，RF3]唤醒，并发送空口同步参考信号。
实施例三
在小小区的部署场景下，假设目标小区的监听子帧位置为[SF2，RF3],周期为T,目标小区在监听子帧位置监听源小区发送的空口同步参考信号，目标小区周期性地向源小区上报其状态信息，目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。以目标小区上报候选同步源小区集信息为例，假设源小区下属目标小区上报的候选同步源小区都包含该源小区，且对一定数量的下属目标小区来说，该源小区为唯一候选同步源，即当该源小区关闭后，这些目标小区不能找到合适的同步源，则源小区基于这些上报的状态信息，决定自己不可以进入关闭状态。
实施例四
如图3所示，假设cell3的初始同步源为cell1,源小区配置目标小区的监听子帧信息，目标小区自主进行、或者由源小区配置后进行周期性的新同步源小区发现，并配置目标小区向源小区上报状态信息，目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。此时，假定cell3向cell1上报候选同步源小区集信息，假设在时刻t1,cell1进入关闭状态，cell3通过在候选同步源小区集中选择新的同步源cell2,目标小区cell3进行周期性的新的同步源小区的发现；假设在t2时刻，cell1重新激活进入开启状态，则cell3在进行周期性的同步源小区发现过程中发现cell1可作为其候选的同步源小区，cell3将这一信息反馈给源小区cell2，此时同步源小区cell2的同步层级为4，而原同步源小区cell1的同步层级为2，则cell2会通知cell3进行同步源小区的切换操作，并将新的同步源cell1的相关信息通知cell3，此后cell3将在新的监听子帧时刻侦听cell1发送空口同步侦听的参考信号来完成空口同步。
假设在t3时刻，cell1(可能能作为cell3的候选源小区)被激活，并将 激活信息通知cell3，当cell3接收到该通知之后，cell3则进行重选同步源小区的过程。
实施例五
在小小区的部署场景下，假设目标小区的监听子帧位置为[SF2，RF3]，周期为T,假设当前时刻t1刚好为目标小区的监听子帧位置，且源小区将在时刻t2进入关闭状态，t2>t1,且t2-t1<T，进入关闭状态的源小区不发送空口同步参考信号/发现信号，监听目标小区的反馈状态信息；在目标小区的下一个监听时刻t1+T,目标小区侦听不到源小区的空口同步参考，此时目标小区触发进行新的空口同步侦听尝试，并将是否找到新的同步源等信息向源小区进行反馈，源小区基于目标小区的反馈信息来确定自身是否需要激活发送空口同步参考信号或发现信号，例如：在t1+T和t1+2T这段时间内，若目标小区反馈可以找到新的同步源，则源小区继续处于关闭状态；否则源小区就在t1+NT(N大于等于2)时刻进行激活，发送空口同步参考信号或发现信号供目标小区进行空口侦听，而在其他时刻仍然处于关闭状态。
实施例六
在小小区的部署场景下，源小区可供选择的关闭状态包括以下一个或者多个：1)源小区完全关闭；2)源小区仅仅发送发现信号(DS)；3)源小区发送DS和用于空口同步参考信号；4)源小区仅发送空口同步参考信号；5)源小区不发送空口同步参考信号/发现信号，监听目标小区的反馈状态信息，基于反馈信息决定是否在目标小区的监听子帧位置发送空口同步参考信号；6)源小区仅在目标小区的监听子帧位置发送空口同步参考信号，而在其他时刻关闭；
当源小区源选择关闭的可能状态为4)时，此时在关闭时间内，源小区监听目标小区反馈的状态信息，例如：目标小区是否找到新的同步源，假 如目标小区反馈未找到新的同步源，则源小区在目标小区监听子帧之外的其他子帧完全关闭，不发送空口同步参考信号/发现信号，而仅在目标小区的监听子帧位置发送空口同步参考信号。
实施例七
在小小区的部署场景下，假设同一区域内存在两个运营商的小小区部署，假设为运营商A和B，运营商A和B部署在相邻频段，目标小区为运营商A的小小区，目标小区对周边可用源小区进行空口同步侦听尝试，可用源小区包括同运营商小区，也包括异运营商的小区；目标小区将侦听候选同步源小区时对应的监听子帧位置信息通知给自己的邻小区，且监听子帧位置信息是以目标小区为基准的；候选同步源小区假设为{A1，A2，B1}，其中A1，A2属于运营商A的小小区，B1属于运营商B的小小区，目标小区通知给的邻小区既包括相同运营商的小区，也包括不同运营商的小区，且候选同步源小区也在邻小区的集合内，基于邻小区和目标小区间交互的信息，目标小区和邻小区间进行干扰协调操作，例如：会协商哪些小区在哪个时刻/子帧进行协调和侦听，其它可能干扰的邻小区在这些时刻/子帧作Muting等操作，假设目标小区监听候选源小区B1的子帧为[SF4,RF4]，通过协商，可能对目标小区产生干扰的邻小区在子帧[SF4,RF4]时刻进行Muting，这样目标小区在侦听其他运营商的小区时不会因临近小区的干扰而造成侦听性能下降。
实施例八
在小小区的部署场景，假设目标小区的监听子帧位置为[SF2，RF3]，周期为T，假设该目标小区的同步源小区在时刻t1进入关闭状态，t2刚好为目标小区的监听子帧位置，(t2-T<t1<t2)，在t2时刻，源小区的可能操作为：1)源小区完全关闭；2)源小区仅仅发送发现信号(DS)；3)源小区发送DS和用于空口同步参考信号；4)源小区仅发送空口同步参考信号； 5)源小区不发送空口同步参考信号/发现信号，监听目标小区的反馈状态信息，基于反馈信息决定是否在目标小区的监听子帧位置发送空口同步参考信号；6)源小区仅在目标小区的监听子帧位置发送空口同步参考信号，而在其他时刻关闭；
其中，所述发现信号和空口同步参考信号可能为以下信号形式的组合：小区专用参考信号(CRS)，信道状态指示参考信号(CSI-RS)，定位参考信号(PRS)，新设置的专用参考信号；其中，关于组合形式，发现信号和空口同步参考信号形式可能相同，例如同为CRS，或同为CSI-RS，或同为PRS，或者为不同的信号形式，当发现信号和空口同步参考信号同为CSI-RS，或者同为PRS，及为不同的信号形式时，发现信号和空口同步参考信号的配置周期及发送子帧位置可配置相同，也可配置不同。
实施例九
在小小区的部署场景下，假设同一区域内存在两个运营商的小小区部署，假设为运营商A和B，运营商A和B部署在相邻频段，目标小区为运营商A的小小区，目标小区对周边可用源小区进行空口同步侦听尝试，可用源小区包括同运营商小区，也包括异运营商的小区；目标小区将侦听候选同步源小区时对应的监听子帧位置信息通知给自己的邻小区，且监听子帧位置信息是以目标小区为基准的；候选同步源小区假设为{A1，A2，B1}，其中A1，A2属于运营商A的小小区，B1属于运营商B的小小区，目标小区通知的邻小区为和目标小区的运营商相同的小区，基于邻小区和目标小区间交互的信息，目标小区和邻小区间进行干扰协调操作，例如：会协商哪些小区在哪个时刻/子帧进行协调和侦听，其它可能干扰的邻小区在这些时刻/子帧作Muting等操作，假设目标小区监听候选源小区B1的子帧为[SF4,RF4]，通过协商，可能对目标小区产生干扰的邻小区(运营商A中的小区)在子帧[SF4,RF4]时刻进行Muting。这样，目标小区在侦听其他运营商的小 区时不会因临近小区的干扰而造成侦听性能下降，所述目标小区和邻小区间的交互方式可通过以下至少之一实现：基于系统消息配置的方法、基于基站间X2接口的方法、基于无线资源控制协议(RRC)信令配置的方法、基于物理层信令的方法、基于S1接口的方法。
本发明实施例还提供了一种实现空口同步的小区40，如图4所示，包括判断处理单元401，配置为进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。
在一个实施例中，所述判断处理单元401，配置为向目标小区通知所述小区进入关闭状态的时刻信息，并基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态；所述目标小区的反馈信息为：目标小区在进行新的空口同步侦听时是否找到新的同步源。
在一个实施例中，所述判断处理单元401，配置为配置目标小区的监听子帧，并依据目标小区上报的目标小区的开关状态信息确定是否关闭。
在一个实施例中，所述判断处理单元401，配置为配置目标小区的监听子帧，确保所述小区在目标小区的监听子帧处能被目标小区侦听。
其中，所述判断处理单元确保所述小区在目标小区的监听子帧处能被目标小区侦听，包括：
判断处理单元确保所述小区保持开启状态，或者确保所述小区在目标小区的监听子帧处从关闭状态变为开启状态，或者确保所述小区在目标小区的监听子帧处发送空口同步信号。
在一个实施例中，所述判断处理单元401，配置为配置目标小区的监听子帧，和/或配置目标小区向所述小区上报状态信息；依据目标小区上报的状态信息确定是否进入关闭状态。
其中，目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集 信息。
在一个实施例中，所述判断处理单元401，配置为配置目标小区的监听子帧，和/或配置目标小区向所述小区上报状态信息；依据目标小区上报的状态信息，决定目标小区是否需要切换到候选同步源小区集中的一个小区作为新的同步源小区。
在一个实施例中，所述判断处理单元401，还配置为所述小区选择关闭状态，并依据选择执行所述关闭状态对应的操作；
其中，所述源小区所选择的关闭状态包括以下之一：
所述小区完全关闭、或者所述小区仅发送发现信号、或者所述小区发送发现信号和空口同步参考信号、或者所述小区仅发送空口同步参考信号、或者所述小区不发送空口同步参考信号和/或发现信号，仅监听目标小区的反馈状态信息，基于所述反馈状态信息决定是否在目标小区的监听子帧位置进行激活，或者所述小区仅在目标小区的监听子帧位置发送空口同步参考信号，其余时刻关闭。
其中，所述判断处理单元401可通过小区40中的中央处理器(Central Processing Unit，CPU)、数字信号处理器(Digital Signal Processor，DSP)或可编程逻辑阵列(Field－Programmable Gate Array，FPGA)实现。
本发明实施例还提供了一种实现空口同步的小区50，如图4所示，包括：通知单元501，配置为通知邻小区自己执行听的空口同步的子帧位置信息；所述执行听的空口同步的子帧位置信息配置为通知邻小区在所述子帧位置执行静默。
在一个实施例中，所述通知单元501，还配置为对周边可用源小区进行空口同步侦听尝试，将候选的同步源小区通知给自己的邻小区；
其中，所述候选的同步源小区包括：与所述小区属于相同运营商的小区，也包括与所述小区属于不同运营商的小区。
其中，所述邻小区包括与所述小区属于相同运营商的小区，也包括与所述小区属于不同运营商的小区。
其中，所述执行听的空口同步的子帧位置信息是依据所述小区的子帧位置得出的。
其中，所述通知单元501可通过小区50中的CPU、DSP或FPGA实现。
本发明实施例还提供了一种实现空口同步的系统，该系统包括：上文所述的小区40以及小区50。
本发明实施例通过基站之间的信令交互，避免了源小区的关闭对目标小区的空口同步造成的影响，而且也增强了源小区的关闭机制，使其既能达到节能的目地，同时也不会对其他小区的同步产生影响。
本说明书中的候选同步源小区，或候选同步源小区集可以包含一个或者多个小区，例如实施例七和九中优选同步源小区为一个小区的情形。
本说明书中目标小区当前侦听的源小区也包含在该目标小区的候选同步源小区，或候选同步源小区集信息内。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现 在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (34)

  1. 一种实现空口同步的方法，该方法包括：
    源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。
  2. 根据权利要求1所述的方法，其中，所述源小区与目标小区信令交互的内容包括以下至少之一：
    源小区的开关状态信息、目标小区的开关状态信息、目标小区是否找到新的同步源、源小区进入关闭状态的时刻信息、目标小区的候选同步源小区集信息、目标小区关联的下属的目标小区信息。
  3. 根据权利要求1所述的方法，其中，所述源小区与目标小区信令交互的方式为：基于周期性的交互方式，或者基于事件触发的交互方式，或者基于所述周期性的交互方式与事件触发的交互方式两种方式相结合的交互方式。
  4. 根据权利要求1所述的方法，其中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
    源小区向目标小区通知源小区进入关闭状态的时刻信息，并基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态；所述目标小区的反馈信息为：目标小区在进行新的空口同步侦听时是否找到新的同步源。
  5. 根据权利要求4所述的方法，其中，所述源小区基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态，包括：
    若目标小区的反馈信息为已找到新的同步源，则源小区就在预定的关闭时刻进入关闭状态；若目标小区的反馈信息为不能找到新的同步源，则源小区就不允许进入关闭状态。
  6. 根据权利要求1所述的方法，其中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
    源小区配置目标小区的监听子帧，并依据目标小区上报的目标小区的开关状态信息确定是否关闭。
  7. 根据权利要求6所述的方法，其中，所述源小区依据目标小区上报的目标小区的开关状态信息确定是否关闭，包括：
    若源小区下属的目标小区都处于关闭状态，且源小区即将进入关闭状态，则源小区在预定的关闭时刻进入关闭状态；否则，若源小区下属的目标小区有的处于开启状态，有的处于关闭状态的，且源小区即将进入关闭状态，则源小区就不允许进入关闭状态。
  8. 根据权利要求1所述的方法，其中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
    源小区配置目标小区的监听子帧，确保源小区在目标小区的监听子帧处能被目标小区侦听。
  9. 根据权利要求8所述的方法，其中，所述确保源小区在目标小区的监听子帧处能被目标小区侦听，包括：
    源小区保持开启状态，或者源小区在目标小区的监听子帧处从关闭状态变为开启状态，或者源小区在目标小区的监听子帧处发送空口同步信号。
  10. 根据权利要求1所述的方法，其中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
    源小区配置目标小区的监听子帧，和/或配置目标小区向源小区上报状态信息；源小区依据目标小区上报的状态信息确定是否进入关闭状态。
  11. 根据权利要求10所述的方法，其中，所述目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。
  12. 根据权利要求1所述的方法，其中，所述源小区进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭，包括：
    源小区配置目标小区的监听子帧，和/或配置目标小区向源小区上报状态信息；源小区依据目标小区上报的状态信息，决定目标小区是否需要切换到候选同步源小区集中的一个小区作为新的同步源小区。
  13. 根据权利要求12所述的方法，其中，所述目标小区上报的状态信息包括以下至少之一：
    目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。
  14. 根据权利要求1-13中任一项所述的方法，其中，该方法还包括：
    所述源小区选择关闭状态，并依据选择执行所述关闭状态对应的操作；
    其中，所述源小区所选择的关闭状态包括以下之一：
    源小区完全关闭、或者源小区仅发送发现信号、或者源小区发送发现信号和空口同步参考信号、或者源小区仅发送空口同步参考信号、或者源小区不发送空口同步参考信号和/或发现信号，仅监听目标小区的反馈状态信息，基于所述反馈状态信息决定是否在目标小区的监听子帧位置进行激活，或者源小区仅在目标小区的监听子帧位置发送空口同步参考信号，其余时刻关闭。
  15. 根据权利要求14所述的方法，其中，所述发现信号和空口同步参考信号为以下一种或两种信号形式的组合：
    小区专用参考信号，信道状态指示参考信号，定位参考信号，新设置的专用参考信号。
  16. 根据权利要求6、8、10或12所述的方法，其中，所述源小区与目标小区间配置信息或信令的交互方法包含以下至少之一：
    基于系统消息配置的方法、基于基站间X2接口的方法、基于无线资源控制协议RRC信令配置的方法、基于物理层信令的方法，基于S1接口的方法。
  17. 一种实现空口同步的方法，该方法包括：
    目标小区通知邻小区自己执行听的空口同步的子帧位置信息；所述执行听的空口同步的子帧位置信息配置为通知邻小区在所述子帧位置执行静默。
  18. 根据权利要求17所述的方法，其中，该方法还包括：
    目标小区对周边可用源小区进行空口同步侦听尝试，将候选的同步源小区通知给自己的邻小区；
    其中，所述候选的同步源小区包括：与所述目标小区属于相同运营商的小区，也包括与所述目标小区属于不同运营商的小区。
  19. 根据权利要求17或18所述的方法，其中，所述邻小区包括与所述目标小区属于相同运营商的小区，也包括与所述目标小区属于不同运营商的小区。
  20. 根据权利要求17或18所述的方法，其中，所述执行听的空口同步的子帧位置信息是依据目标小区的子帧位置得出的。
  21. 一种实现空口同步的小区，该小区包括：判断处理单元，配置为进行与目标小区间的信令交互，并根据信令交互结果确定是否关闭。
  22. 根据权利要求21所述的小区，其中，所述判断处理单元，配置为向目标小区通知所述小区进入关闭状态的时刻信息，并基于目标小区的反馈信息确定是否在预定的时刻进入关闭状态；所述目标小区的反馈信息为：目标小区在进行新的空口同步侦听时是否找到新的同步源。
  23. 根据权利要求21所述的小区，其中，所述判断处理单元，配置为配置目标小区的监听子帧，并依据目标小区上报的目标小区的开关状态信息确定是否关闭。
  24. 根据权利要求21所述的小区，其中，所述判断处理单元，配置为配置目标小区的监听子帧，确保所述小区在目标小区的监听子帧处能被目 标小区侦听。
  25. 根据权利要求24所述的小区，其中，所述判断处理单元确保所述小区在目标小区的监听子帧处能被目标小区侦听，包括：
    判断处理单元确保所述小区保持开启状态，或者确保所述小区在目标小区的监听子帧处从关闭状态变为开启状态，或者确保所述小区在目标小区的监听子帧处发送空口同步信号。
  26. 根据权利要求21所述的小区，其中，所述判断处理单元，配置为配置目标小区的监听子帧，和/或配置目标小区向所述小区上报状态信息；依据目标小区上报的状态信息确定是否进入关闭状态。
  27. 根据权利要求26所述的小区，其中，所述目标小区上报的状态信息包括以下至少之一：目标小区的开关状态信息，目标小区的下属目标小区信息，目标小区的候选同步源小区集信息。
  28. 根据权利要求21所述的小区，其中，所述判断处理单元，配置为配置目标小区的监听子帧，和/或配置目标小区向所述小区上报状态信息；依据目标小区上报的状态信息，决定目标小区是否需要切换到候选同步源小区集中的一个小区作为新的同步源小区。
  29. 根据权利要求21-28中任一项所述的小区，其中，所述判断处理单元，还配置为所述小区选择关闭状态，并依据选择执行所述关闭状态对应的操作；
    其中，所述小区所选择的关闭状态包括以下之一：
    所述小区完全关闭、或者所述小区仅发送发现信号、或者所述小区发送发现信号和空口同步参考信号、或者所述小区仅发送空口同步参考信号、或者所述小区不发送空口同步参考信号和/或发现信号，仅监听目标小区的反馈状态信息，基于所述反馈状态信息决定是否在目标小区的监听子帧位置进行激活，或者所述小区仅在目标小区的监听子帧位置发送空口同步参 考信号，其余时刻关闭。
  30. 一种实现空口同步的小区，该小区包括：通知单元，配置为通知邻小区自己执行听的空口同步的子帧位置信息；所述执行听的空口同步的子帧位置信息配置为通知邻小区在所述子帧位置执行静默。
  31. 根据权利要求30所述的小区，其中，所述通知单元，还配置为对周边可用源小区进行空口同步侦听尝试，将候选的同步源小区通知给自己的邻小区；
    其中，所述候选的同步源小区包括：与所述小区属于相同运营商的小区，也包括与所述小区属于不同运营商的小区。
  32. 根据权利要求30或31所述的小区，其中，所述邻小区包括与所述小区属于相同运营商的小区，也包括与所述小区属于不同运营商的小区。
  33. 根据权利要求30或31所述的小区，其中，所述执行听的空口同步的子帧位置信息是依据所述小区的子帧位置得出的。
  34. 一种实现空口同步的系统，该系统包括：权利要求21-29中任一项所述的小区以及权利要求30-33中任一项所述的小区。
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