WO2011076062A1 - Station de base et procédé de traitement de synchronisation de station de base dans un réseau hiérarchique - Google Patents

Station de base et procédé de traitement de synchronisation de station de base dans un réseau hiérarchique Download PDF

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Publication number
WO2011076062A1
WO2011076062A1 PCT/CN2010/079502 CN2010079502W WO2011076062A1 WO 2011076062 A1 WO2011076062 A1 WO 2011076062A1 CN 2010079502 W CN2010079502 W CN 2010079502W WO 2011076062 A1 WO2011076062 A1 WO 2011076062A1
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Prior art keywords
synchronization
base station
synchronization source
source
timer
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PCT/CN2010/079502
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English (en)
Chinese (zh)
Inventor
朱亚军
杨晓东
张�杰
潘学明
赵锐
秦飞
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电信科学技术研究院
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Publication of WO2011076062A1 publication Critical patent/WO2011076062A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • 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 mobile communication technologies, and in particular, to a method and a base station for synchronizing a base station in a layered network. Background technique
  • the base station e.g., HeNB PeNB/FeNB/Relay Node, Home Base Station/Pico Cell Base Station/Femto Cellular Base Station/Relay Base Station
  • the low-power base station is a base station device used in a home indoor environment, an office environment, or other small coverage environments. The deployment of such a low-power base station enables operators to provide higher data rates and lower cost. Attractive business.
  • the introduction of a low-power base station may cause interference to the communication of the existing macro base station.
  • the low-power base station and the macro base station are not synchronized, such interference will be particularly serious. Therefore, it is necessary to solve the problem of synchronization between the low-power base station and the macro base station.
  • FIG. 1 is a schematic diagram of the intra-base station synchronization scheme of the hierarchical system. As shown in the figure: When eNB1 is listening to the synchronization signal of eNB0, if eNB2 is transmitting data at this time, then eNBl The synchronization signal reception will be disturbed.
  • HeNB1 is synchronized with a macro base station (referred to as a synchronization base station, Sync eNB in this example), and HeNB2 can perform synchronization through HeNB1. .
  • the Sync eNB (synchronous eNB) is layer 0
  • the base station HeNB1 that performs synchronization using the base station of layer 0 is layer 1
  • the base station HeNB2 that performs synchronization using the base station HeNB1 of layer 1 is layer 2, and so on.
  • the base station of the next layer should stop the transmission of data to avoid interference. Therefore, the base station of each layer needs to be configured as a function of the number of layers, so that the base stations located in the same layer monitor the synchronization information of the upper base station in the same subframe position, and listen to the upper layer. At the subframe position of the synchronization information of the base station, the base station of the next layer needs to perform silence. Therefore, the base station of each layer needs to transmit information about the layer. Currently, the base station transmits the number of layers (2 bits) of the base station and whether or not the information (1 bit) is synchronized. This information can be:
  • MIB Master Information Block
  • SIB-1 System Information Block-1
  • the base station can configure the MBSFN (MBSFN Multicast Broadcast Single Frequency Network) subframe to perform synchronous monitoring on the configured MBSFN subframe.
  • MBSFN MBSFN Multicast Broadcast Single Frequency Network
  • the NMS sends the configuration of the synchronization subframes for each layer.
  • these synchronization subframes can be implemented by configuring MBSFN.
  • the disadvantages of the prior art are: Considering that in a layered network, the activity of the base station will be very random, so when synchronizing using the scheme of inter-base station interception, it is likely that the base station that is listening is turned off or other causes are caused. Unable to listen to synchronization information.
  • the base station needs to have a mechanism to ensure that it is in a synchronized state.
  • the technical problem to be solved by the embodiments of the present invention is to provide a synchronization processing method and a base station for a base station in a layered network.
  • the embodiment of the present invention provides a method for synchronizing a base station in a layered network, including: the base station measuring a signal shield of a cell-specific pilot signal CRS of a current synchronization source base station while maintaining synchronization;
  • the base station If it is determined that the state is out of synchronization, the base station reselects the synchronization source and performs synchronization.
  • a base station is provided in the embodiment of the present invention, including:
  • a measuring module configured to measure a signal quality of a CRS of a current synchronization source base station while maintaining synchronization of the base station;
  • a judging module configured to determine, according to the signal quality, whether the base station is in an out-of-synchronization state
  • a synchronization module configured to re-select the synchronization source and perform synchronization when determining that the synchronization is in an out-of-synchronization state.
  • the base station measures the signal quality of the CRS of the current synchronization source base station while maintaining synchronization; and determines whether the base station is in an out-of-synchronization state according to the measured signal quality; When the state is out of synchronization, the synchronization source is reselected and then synchronized.
  • the base station detects whether the user is in an out-of-synchronization state by measuring the signal quality of the CRS of the monitored synchronous base station, and reselects the synchronous base station when detecting the out-of-synchronization state. Synchronization, so it is possible to find the out-of-synchronization state in time, and take measures to ensure that they are in a synchronized state, providing the necessary supplement for the synchronization scheme in the layered network.
  • the N2010/079502 is charged to ensure synchronization of the base stations in the entire hierarchical network.
  • FIG. 1 is a schematic diagram of a synchronization scheme between base stations of a layered system in the background art
  • FIG. 2 is a schematic diagram of a multi-hop synchronization scheme in the background art
  • FIG. 3 is a schematic flowchart of a method for implementing synchronization processing of a base station in a layered network according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of an implementation process of out-of-synchronization detection processing applied to a layered network according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. detailed description
  • the base station needs to have a certain mechanism to ensure that it is in a synchronized state. Therefore, the base station needs to discover the out-of-synchronization state in time.
  • the base station will pass The signal shield of the CRS of the synchronized base station is monitored to detect whether it is in an out-of-synchronization state, and when the out-of-synchronization state is detected, the synchronization base station is reselected for synchronization to ensure synchronization of the base stations in the entire hierarchical network.
  • FIG. 3 is a schematic flowchart of an implementation process of a method for synchronizing a base station in a layered network. As shown in the figure, the synchronization process may include:
  • Step 301 The base station measures the signal quality of the cell-specific pilot signal CRS of the current synchronization source base station while maintaining synchronization;
  • Step 302 The base station determines, according to the signal quality, whether the base station is in an out-of-synchronization state.
  • Step 303 If it is determined that the base station is in an out-of-synchronization state, the base station re-selects the synchronization source and performs synchronization.
  • the base station may perform synchronization maintenance according to the corresponding protocol procedure or by detecting the CRS information of the current synchronization source base station during the synchronization process. Specifically, after completing the initial synchronization, the base station may detect the current synchronization source base station according to the corresponding protocol flow or 10 079502
  • the CRS information is kept in synchronization.
  • the signal quality may be a measured SINR (Signal to Interference plus Noise Ratio) value of the CRS of the current synchronization source base station.
  • SINR Signal to Interference plus Noise Ratio
  • the low power base station may measure the SINR value of the received signal when detecting the CRS of the current synchronization source base station in step 301.
  • the base station determines, according to the signal shield quantity, whether the base station is in an out-of-synchronization state, and may include:
  • the out-of-synchronization indication message is reported to the upper layer of the base station.
  • the base station when the base station reports the out-of-synchronization indication message to the upper layer of the base station, the base station may trigger the out-of-synchronization indication message from the physical layer.
  • the base station if the average value of the signal quality of the CRS of the synchronization source base station is higher than a certain threshold within a certain period of time, the base station considers that it is in a synchronized state, and continues to maintain the synchronization; if the CRS is measured If the average value of the SINR is below a certain threshold, an out-of-sync indication message is triggered by the physical layer to the upper layer, and the implementation threshold can be obtained by simulation.
  • the high level of implementation refers to the relative high level inside a base station. For example, the base station is reported by the physical layer to the upper layer RRC layer.
  • it may further include:
  • the timer is started.
  • the timer of the base station is turned on, and the upper layer continuously receives multiple synchronized indication messages from the physical layer, the timer is stopped, and the base station determines that the base station is in a synchronized state.
  • the base station determines that the base station is in an out-of-synchronization state. It can be seen that, in step 302, after reporting the out-of-synchronization indication message to the upper layer of the base station, when the upper layer continuously monitors multiple (constant defined by the upper layer), the indication message from the physical layer is out-of-sync. Then the upper layer can start a timer, when the timer is turned on, and receives multiple consecutive in-sync (synchronization) indication messages from the physical layer (constitutable constants defined by the upper layer) N2010/079502 The base station will stop the timer. At this point, the synchronization problem has been recovered and the base station will continue to work normally. If the timer expires, then the radio link detection is considered to be in an out-of-synchronization state, and the upper layer will trigger the physical layer to re-synchronize.
  • the method may further include: performing, by the base station, initial synchronization according to an existing protocol procedure;
  • the newly-powered base station may perform initial synchronization according to an existing protocol flow; or search for a synchronization source that can be monitored by performing a process similar to the initial search of the terminal cell, and establish synchronization with the same.
  • the new node can obtain information about the synchronization source through the air interface or a supportable interface (such as the X2 interface), including the layer information of the synchronization source and whether the information is synchronized.
  • the information of the multiple synchronization sources is saved, and the synchronization source base station information that meets the synchronization requirement is maintained in the synchronization source set; for example, according to some preset and certain The rule maintains the synchronization source base station information satisfying the synchronization requirement into the synchronization source set.
  • the new node or the newly booted base station may obtain a set of synchronization sources that can be synchronized, and then select an optimal node to synchronize, while maintaining a synchronized set, so as to be in the current
  • the synchronization source becomes unavailable, it can be quickly switched to another synchronization source, that is, when multiple synchronization sources are obtained through monitoring or through the interface, the information of multiple synchronization sources is saved, so that the base station is reselected.
  • the synchronization source synchronizes, it is possible to quickly select an optimal node for synchronization.
  • the base station when the base station reselects the synchronization source, the base station may include:
  • the synchronization source is selected from the synchronization source set according to a preset rule, and synchronization is established with the synchronization source; for example: according to a preset rule: "From the synchronization source set The one of the base stations corresponding to the best signal quality received by the base station is selected as a new synchronization source to select a base station in the synchronization source set as a new synchronization. Source, and then establish synchronization with it;
  • the new synchronization source is searched again.
  • step 303 when the base station determines that it is in an out-of-synchronization state, it may further include:
  • the base station stops uplink and downlink data transmission and reselects the synchronization source.
  • the processing is to avoid interference to other users, so the low-power base station can stop the transmission of the downlink data and the reception of the uplink data, and then select a new synchronization source.
  • the base station in the synchronization set maintained in the previous step may be preferentially selected as the new synchronization source.
  • the synchronization source is selected to initiate a synchronization process; if no signal of the base station can satisfy the requirement in the maintained synchronization set, the low power base station can re-search for another
  • the layer information and synchronization information of the base station are selected, and an appropriate synchronization source is selected for initial synchronization.
  • the base station may further include:
  • the base station performs initial synchronization according to an existing protocol flow
  • the low power base station can transmit data after re-establishing the synchronization.
  • Figure 4 is a schematic diagram of an implementation process of out-of-synchronization detection processing applied to a layered network. As shown in the figure, the following steps may be included:
  • Step 401 The base station performs initial synchronization.
  • the newly-on base station performs initial synchronization according to an existing protocol flow; or searches for a synchronization source that can be monitored by performing a step similar to the initial search of the terminal cell, and establishes synchronization with it.
  • the new node obtains information about the synchronization source through the air interface or a supportable interface (such as the X2 interface), including the layer information of the synchronization source and whether the information is synchronized.
  • the new node may obtain a set of synchronization sources that can be synchronized, and an optimal node needs to be selected for synchronization while maintaining a synchronized collection so that when the current synchronization source becomes unavailable. , you can quickly switch to another sync source.
  • Step 402 The base station performs synchronization holding.
  • the base station may perform synchronization maintenance according to the corresponding protocol procedure or by detecting the CRS information of the current synchronization source base station.
  • Step 403 The base station measures a signal quality of a CRS of the current synchronization source base station.
  • the low power base station measures the SINR value of the received signal when detecting the CRS of the current synchronization source base station.
  • Step 404 Determine whether the step is lost. If yes, go to step 405. Otherwise, go to step 402.
  • the base station In this step, if the average value of the signal quality of the CRS is higher than a certain threshold within a certain period of time, the base station considers that it is in a synchronized state and continues to maintain the synchronization; if the CRS signal is measured If the average value of the quality is below a certain threshold, then an out-of-sync indication message is triggered by the physical layer to the upper layer. When the upper layer continuously monitors multiple (constant defined by the upper layer), the out-of-sync comes from the physical layer.
  • the upper layer will start a timer, when the timer is turned on, and the continuous in-sync indication message from the physical layer (constant defined by the higher layer) is received, the base station will stop the timer. At this point, it is considered that the physical layer problem has been restored and the base station will continue to work normally. If the timer expires, then the radio link detection is considered to be in an out-of-synchronization state, and the upper layer will trigger the physical layer to re-synchronize, and proceeds to step 405;
  • Step 405 The base station stops data transmission.
  • the low power base station stops the transmission of the downlink data and the reception of the uplink data, and performs a new synchronization source selection.
  • Step 406 Determine whether there is a suitable synchronization source in the synchronization source set, if yes, go to step 407; otherwise, go to step 401.
  • step 407 when selecting a new synchronization source, preference is given to the selected synchronization set.
  • step 407 if there are some base station signals satisfying the synchronization requirement, proceed to step 407; if no signal of the base station can satisfy the requirement in the maintained synchronization set, then proceeding to step 401, the low power base station will go to search again.
  • the layer information and synchronization information of the base station are selected, and an appropriate synchronization source is selected for initial synchronization.
  • Step 407 After selecting a new synchronization source, perform step 402.
  • the low-power base station selects the base station with the best signal quality in the maintained synchronization set as a new synchronization source, and re-establishes the data transmission after synchronization.
  • the mechanism for detecting out-of-synchronization in a layered network provided in the embodiment of the present invention provides a necessary supplement for the synchronization scheme in the layered network.
  • the base station is further provided in the embodiment of the present invention. Since the principle of the base station solving the problem is similar to the synchronization processing method of the base station in the layered network, the implementation of the base station can refer to the implementation of the method, and the repetition is no longer Narrative,
  • FIG. 5 is a schematic structural diagram of a base station. As shown in the figure, the base station may include:
  • the measuring module 501 is configured to measure a signal quality of a CRS of the current synchronization source base station while maintaining synchronization of the base station;
  • the determining module 502 is configured to determine, according to the signal quality, whether the base station is in an out-of-synchronization state
  • the synchronization module 503 is configured to perform synchronization after reselecting the synchronization source when it is determined that the synchronization is in an out-of-synchronization state.
  • the synchronization module may be further configured to perform synchronization maintenance according to a corresponding protocol flow during the synchronization process, or to perform synchronization maintenance by detecting CRS information of the current synchronization source base station.
  • the measurement module may be further configured to measure a SINR value of the received CRS of the current synchronization source base station.
  • the determining module may be further configured to report the out-of-synchronization indication message to the upper layer when the average signal quality of the CRS of the current synchronization source base station received by the base station is lower than a preset threshold.
  • the determining module may be further configured to report the out-of-synchronization indication to the upper layer of the base station.
  • the out-of-synchronization indication message is triggered from the physical layer.
  • the determining module may be further configured to: when the upper layer of the base station receives the multiple out-of-synchronization indication messages from the physical layer, start the timer.
  • the judging module may be further configured to: when the timer is turned on, the high layer continuously receives the synchronized indication messages from the physical layer, stops the timer, and determines that the base station is in a synchronized state.
  • the determining module may be further configured to: when the timer is turned on, and the timer expires, determining that the timer is out of synchronization.
  • the base station may further include:
  • the initial synchronization module 504 is configured to perform initial synchronization according to an existing protocol flow before the synchronization process is maintained; or, by searching for a synchronization source that can be monitored by searching for a cell, using an air interface or a supported interface. Synchronize the information about the source and synchronize with the monitored optimal synchronization source.
  • the initial synchronization module may be further configured to save information of multiple synchronization sources when acquiring multiple synchronization sources through monitoring or through an interface, and maintain synchronization source base station information that meets synchronization requirements into a synchronization source set; for example, according to A certain rule maintains the synchronization source base station information satisfying the synchronization requirement into the synchronization source set.
  • the synchronization module may be further configured to: when the synchronization source is reselected, if there is a base station that meets the synchronization requirement in the maintained synchronization source set, select a synchronization source from the synchronization source set according to a preset rule, for example, select synchronization.
  • the base station with the best signal quality in the source set acts as a new synchronization source) and establishes synchronization with it; if there is no base station in the maintained synchronization source set that satisfies the synchronization requirement, the new synchronization source is searched again.
  • the synchronization module may be further configured to: perform initial synchronization according to an existing protocol flow when determining that the synchronization source is reselected and the synchronization source that does not meet the synchronization requirement in the synchronization set; or, search by searching by the cell.
  • a synchronization source that can be monitored obtains synchronization source related information by using an air interface or a supported interface, and establishes synchronization with the obtained optimal synchronization source.
  • the base station may further include:
  • the transmission module 505 is configured to stop sending the downlink data and/or receiving the uplink data before determining to reselect the synchronization source to initiate the synchronization process.
  • the base station determines whether it is in an out-of-synchronization state by measuring the signal quality of the CRS of the monitored synchronous base station, and controls the flow of the entire out-of-synchronization detection by using the signal quality.
  • the base station measures the signal quality of the CRS of the current synchronization source base station during the synchronization process, and determines whether to report the out-of-synchronization indication message to the high-layer base station according to the measured signal quality; Determining whether to reselect the synchronization source to initiate the synchronization process according to the indication of the high-level base station.
  • the upper layer of the base station After receiving the reported out-of-synchronization indication message, the upper layer of the base station starts the timer when the number of reported out-of-synchronization indication messages exceeds a preset threshold; after the timer is started, if the timer has expired, the report has not been received.
  • Multiple (predefined by the higher layer) synchronization indication message indicates that the synchronization source is reselected to initiate the synchronization process.
  • the base station detects whether the UE is in an out-of-synchronization state by measuring the signal quality of the CRS of the monitored synchronous base station, and ensures synchronization of the base station in the entire hierarchical network according to the detection result. Therefore, the base station can discover the out-of-synchronization state in time and ensure that it is in a synchronized state, which provides a necessary supplement for the synchronization scheme in the layered network.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely 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, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • 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 a block or blocks of a flow or a flow and/or a block diagram of a flowchart.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une station de base et un procédé de traitement de synchronisation de la station de base dans un réseau hiérarchique. Le procédé comprend les étapes suivantes : une station de base mesure la qualité des signaux de référence spécifiques de cellule d'une station de base source de synchronisation présente au cours du maintien de synchronisation, et évalue si la station de base est dans l'état de perte de synchronisation selon la qualité des signaux; si la station de base est évaluée comme étant dans l'état de perte de synchronisation, la station de base resélectionne une source de synchronisation à synchroniser. En utilisant le système de la présente invention, la station de base peut détecter l'état de perte de synchronisation rapidement et garantir qu'elle est dans l'état de synchronisation, et un supplément essentiel est fourni pour le système de synchronisation dans le réseau hiérarchique.
PCT/CN2010/079502 2009-12-24 2010-12-07 Station de base et procédé de traitement de synchronisation de station de base dans un réseau hiérarchique WO2011076062A1 (fr)

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WO2009022668A1 (fr) * 2007-08-14 2009-02-19 Ntt Docomo, Inc. Dispositif utilisateur, dispositif de station de base et procédé de commande de transmission

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US20220369304A1 (en) * 2016-11-04 2022-11-17 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatuses for handling beam failure
US11871396B2 (en) * 2016-11-04 2024-01-09 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatuses for handling beam failure
EP3585088A4 (fr) * 2017-03-17 2020-03-04 Huawei Technologies Co., Ltd. Procédé et appareil pour déterminer une perte de synchronisation
US10993198B2 (en) 2017-03-17 2021-04-27 Huawei Technologies Co., Ltd. Out-of-synchronization determining method and apparatus

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