WO2010032351A1 - 移動端末、マクロ基地局およびセル選択システム - Google Patents
移動端末、マクロ基地局およびセル選択システム Download PDFInfo
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- WO2010032351A1 WO2010032351A1 PCT/JP2009/002761 JP2009002761W WO2010032351A1 WO 2010032351 A1 WO2010032351 A1 WO 2010032351A1 JP 2009002761 W JP2009002761 W JP 2009002761W WO 2010032351 A1 WO2010032351 A1 WO 2010032351A1
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- WIPO (PCT)
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- base station
- information
- offset
- mobile terminal
- macro base
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
- H04W8/183—Processing at user equipment or user record carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
Definitions
- the present invention relates to a technique in which a mobile terminal selects a cell in a network having a first cell and a second cell included in the first cell.
- eNodeB (hereinafter referred to as “eNB”) and Home eNodeB (hereinafter referred to as “HeNB”) as macro base stations covering a wide area.
- the HeNB is a small base station (micro BS) that covers a relatively narrow area in the cell of the macro base station.
- the operator of HeNB can restrict the user who can access HeNB by ID (CSGID) which HeNB has.
- the HeNB is a base station configured such that access to a core network managed by a mobile operator can be connected even through a network of a network operator different from the mobile operator.
- an administrator such as an office administrator, a shopping mall, or a public facility will place the HeNB.
- a small base station can accommodate mobile terminals in the same manner as a macro base station, but its arrangement is performed in a manner that reflects the intention of the operator of the small base station.
- a small base station owned by an individual user, it is arranged so as to cover the user's home as a service cell, and when it is arranged for a mobile environment on a university campus, a plurality of base stations are covered so as to cover the university premises. It is possible to arrange a small base station.
- the mobile terminal may create and store a white list, which is a list of connectable small base stations. When the mobile terminal detects the small base station, the mobile terminal refers to the white list and determines whether or not it is a connectable small base station.
- the white list can be created, for example, by the following method. (1) In the mode of confirming whether or not connection to a small base station is possible (attempting a connection procedure even if it is not in the white list), the network side adds a small base station that has been confirmed to be connectable to the white list. To ask. (2) Negotiating the ID of the corresponding small base station with the network side and writing the ID notified of being connectable.
- Non-Patent Document 1 describes the definition and operation (UMTS and LTE) of a CSG cell
- Non-Patent Document 2 describes a requirement specification (LTE) of a CSG cell
- Non-Patent Document 3 describes a cell selection operation of a CSG cell ( LTE).
- the selection of a cell is basically performed based on the connection quality between a handover source cell and a handover destination candidate cell.
- the mobile terminal When the connection quality at the handover source does not satisfy a certain condition, the mobile terminal performs quality measurement assuming connection with another base station in order to consider use of another base station.
- the handover destination base station is selected in the state where data transmission is performed between the mobile terminal side and the network side (active state), while the data transmission is not performed between the mobile terminal and the network side (idle state). In the state), the mobile terminal takes the initiative.
- connection quality measured by the mobile terminal is compared, and the base station that seems to have the best quality is selected.
- the network side notifies the offset information as a parameter for addition / subtraction to the measured quality information, and the cell selection tendency Can be controlled.
- the offset information may be notified as broadcast information, or may be individually notified to overwrite the broadcast information in order to set a special value for a specific mobile terminal.
- offset information when a handover (cell selection) candidate base station operates with an access technology different from that of the handover (cell selection) source base station, measurement is performed in the same method Used to offset the difference.
- it is used for the purpose of guiding the mobile terminal to the cell in the intended frequency band on the network side.
- This offset information can also be set as information reflecting “easy connection” to each small base station in the above-described white list.
- a small base station is assumed to be operated by an owner closer to the user. Therefore, the small base station reflects the intention of the user or the owner of the small base station. It is desirable to be able to select whether or not to connect to the base station.
- the user wants to connect the mobile terminal owned by the user preferentially to the small base station at the home of the mobile terminal (for example, there is a preferential treatment in terms of usage fees) and connect to a publicly provided small base station
- a request regarding a connection destination of a user of a mobile terminal, such as wanting to stay in a service area such as a hot spot for a certain period of time, is expressed as a user orientation. Note that the user orientation does not necessarily match the connection destination determined from the communication parameters on the system.
- the mobile operator cell selection criteria take into account factors such as region, frequency band, and access technology.
- the degree and tendency to prioritize the use of small base stations differ depending on each mobile terminal. For example, when mobile terminals are different, the tendency of small base stations to be used preferentially may be completely opposite.
- the mobile terminal In order to set “ease of connection” for each mobile terminal for each small base station, it is conceivable to notify the offset information for each mobile terminal and each small base station.
- the mobile terminal requests a change of the offset information to the corresponding small base station in accordance with the change of the user preference setting.
- the network side broadcasts a list of offset values used by each mobile terminal for cell selection of each small base station via a macro base station in response to a request from the mobile terminal.
- the mobile terminal finds a small base station, the mobile terminal performs cell selection using a list of received offset values.
- this method has a problem that broadcast information becomes very large. For example, if there are n mobile terminals and m small base stations in a cell formed by one macro base station, the broadcast information is a mobile terminal to use n ⁇ m offset information and the offset information. It is also necessary to broadcast information listing the IDs of the small base stations.
- the size of the notification information is generally limited, and it is not desirable to have a structure in which the notification information is enlarged as described above.
- a method using the white list described above is also conceivable.
- the mobile terminal requests a change in the configuration of the white list and notifies the network side which small base station is preferably changed so that it is preferred. .
- the network side changes the priority added to the white list.
- the network side updates offset information used by each mobile terminal for cell selection of each small base station via the macro base station.
- the mobile terminal finds a small base station, the mobile terminal performs cell selection using the latest offset shown in the white list.
- the main purpose of the white list is to manage static information as to whether it can be treated as a connection target as an operation, it is not very suitable for handling frequently updated data.
- the automatic whitelist update cycle is so long that a procedure involving multiple signaling must be performed to intentionally update. Since the preference setting changes from moment to moment according to changes in the usage status of the user, in situations where the small base station to be prioritized must be updated frequently, the user preference setting must be made unless the whitelist is updated frequently. This is not desirable for whitelist operations. There is still a problem that the amount of notification information is very large.
- an object of the present invention is to propose a cell selection control method in which individual user preferences can be individually set for each mobile terminal and the amount of information notification is suppressed.
- the mobile terminal of the present invention is a mobile terminal used in a network having a macro base station and a plurality of home base stations, and receives reception quality of signals received from the macro base station and the home base station.
- a measurement unit an offset information receiving unit that receives offset information used for cell selection from the macro base station, and offset correction information that receives offset correction information that is transmitted from the macro base station by broadcast and corrects the offset information.
- a receiver a priority base station information storage that stores information of at least one priority home base station that is preferentially connected among the plurality of home base stations, and the offset information when the priority home base station is detected.
- An offset information correction unit configured to correct the offset correction information
- the reception A cell selection unit that adds the offset information received by the offset information reception unit or the offset information corrected by the offset information correction unit to the quality, and performs cell selection based on the reception quality with the offset information added .
- This configuration makes it easier for the user to select a priority home base station that the user desires to make a priority connection, and the base station transmits offset correction information, so that the degree to which the priority home base station is easily selected can be adjusted. Since the macro base station only needs to broadcast information common to all mobile terminals, the amount of information to be notified can be suppressed.
- the macro base station of the present invention is a macro base station including a plurality of home base stations in a subordinate cell, an offset information transmitting unit that transmits offset information used for cell selection to the mobile terminal, and the offset information An offset correction information transmitting unit that transmits offset correction information to be corrected to the mobile terminal by broadcasting.
- This configuration makes it easier for the user to select a priority home base station that the user wants to have priority connection to, and the macro base station transmits offset correction information, so that the degree to which the priority home base station is easily selected can be adjusted. Since the macro base station only needs to broadcast information common to all mobile terminals, the amount of information to be notified can be suppressed.
- the cell selection system of the present invention is a system for controlling cell selection by a mobile terminal in a network having a macro base station and a plurality of home base stations, wherein the first macro base station uses an offset for cell selection.
- An offset information transmitting unit for transmitting information to the mobile terminal; and an offset correction information transmitting unit for transmitting offset correction information for correcting the offset information to the mobile terminal by broadcasting, wherein the mobile terminal includes the macro base station And a reception quality measurement unit that measures reception quality of a signal transmitted from the home base station, an offset information reception unit that receives the offset information from the macro base station, and the offset correction information from the macro base station.
- an offset correction information receiving unit for receiving the plurality of home base stations.
- a priority base station information storage unit that stores information of at least one priority home base station to be preferentially connected, and an offset information correction unit that corrects the offset information with the offset correction information when the priority home base station is detected. And adding the offset information received by the offset information reception unit or the offset information corrected by the offset information correction unit to the reception quality, and performing cell selection based on the reception quality with the offset information added A part.
- the cell selection method of the present invention is a cell selection method by a mobile terminal used in a network having a macro base station and a plurality of home base stations, and receives offset information used for cell selection from the macro base station; A step of receiving offset correction information for correcting the offset information, which is transmitted by broadcast from the macro base station; and information on at least one priority home base station to be preferentially connected among the plurality of home base stations.
- a step of correcting by information, and the reception quality includes the matrix. The offset information corrected by the offset information and the offset correction information received from the B base station added, and a step of performing cell selection based on the reception quality obtained by adding offset information.
- the cell selection control method of the present invention is a method for controlling cell selection of a mobile terminal by a macro base station including a plurality of home base stations in a subordinate cell, and provides offset information used for cell selection to the mobile terminal. And transmitting offset correction information for correcting the offset information to the mobile terminal by broadcasting.
- the priority home base station stored in the priority base station information storage unit can be easily selected. Since the base station transmits the offset correction information, it is possible to adjust the degree to which the priority home base station is easily selected and to suppress the amount of information to be notified.
- FIG. 1 is a diagram illustrating a configuration of a mobile terminal according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration of the macro base station according to the first embodiment.
- FIG. 3 is a diagram illustrating a configuration of a network to which the mobile terminal and the macro base station according to the first embodiment are applied.
- FIG. 4 is a diagram illustrating an example of data held in the offset correction information holding unit according to the first embodiment.
- FIG. 5 is a diagram illustrating an example of broadcast information transmitted by the macro base station according to the first embodiment.
- FIG. 6 is a diagram illustrating an operation of the mobile terminal according to the first embodiment.
- FIG. 7 is a diagram illustrating the configuration of the macro base station according to the second embodiment.
- FIG. 1 is a diagram illustrating a configuration of a mobile terminal according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration of the macro base station according to the first embodiment.
- FIG. 3 is a diagram illustrating a configuration of
- FIG. 8 is a diagram illustrating an example of broadcast information transmitted by the macro base station according to the second embodiment.
- FIG. 9 is a diagram illustrating a configuration of a mobile terminal according to the second embodiment.
- FIG. 10 is a diagram illustrating an operation of the mobile terminal according to the second embodiment.
- FIG. 11 is a diagram illustrating an example of data held in the offset correction information holding unit according to the third embodiment.
- the small base station is a Home eNB that supports the 3GPP LTE system.
- the present invention is applied to the Home NB that supports the 3GPP UMTS system. You can also.
- the mobile terminal needs to be changed in accordance with a difference in system conditions such as performing cell selection even in a state other than the idle state, but this change is obvious as a design change performed by those skilled in the art.
- FIG. 1 is a diagram illustrating a configuration of the mobile terminal 10 according to the first embodiment
- FIG. 2 is a diagram illustrating a configuration of the macro base station 30.
- FIG. 3 is a diagram illustrating a configuration of a network to which the mobile terminal 10 and the macro base station 30 according to the first embodiment are applied.
- a wide range of cells C provided by the macro base station 30 a plurality of small base stations 40a to 40c are installed.
- the small base stations 40a to 40c are collectively referred to as the small base station 40.
- Each small base station 40a-40c provides its own cell C1-C3.
- the macro base station 30 is, for example, an eNB specified by 3GPP, and the small base station is a HeNB specified by 3GPP, but is not limited thereto.
- the small base station 40 may be operated by an operator different from the operator of the macro base station 30, or may be operated by the same operator.
- the small base station 40a is installed in a user's home
- the small base station 40b is installed in a shopping mall
- the small base station 40c is installed in a university.
- the mobile terminal 10 can communicate with the macro base station 30 and also with the small base station 40. Note that communication cannot be performed when the small base station 40 does not permit communication with the mobile terminal 10. For example, in the example illustrated in FIG. 3, the small base station 40 installed in the university can refuse communication with the mobile terminal 10 other than those related to the university.
- the mobile terminal 10 When the mobile terminal 10 falls within the communication range of the small base station 40, the mobile terminal 10 can perform communication using the macro base station 30 and the small base station 40 with the better connection quality. Thus, selecting a cell based on connection quality among a plurality of cells is called cell selection.
- the mobile terminal 10 includes a basic communication function 12, a preference setting unit 14, a small base station management unit 16, an offset information correction processing unit 18, an offset correction information holding unit 20, an offset information holding unit 22, and a cell selection. Part 24.
- the basic communication function 12 includes a reception quality measuring unit 13 that measures reception quality of signals from the macro base station and the home base station.
- the mobile terminal 10 also has a data transmission / reception unit, a handover function unit between base stations, and the like, as in the case of a conventional mobile terminal.
- each configuration of the mobile terminal 10 will be described.
- the orientation setting unit 14 has a function of setting an orientation that the user wants to connect to which of the small base stations 40 preferentially.
- the user's intention may be accepted by input from the user, or may be estimated by application software or the like.
- the orientation setting unit 14 notifies the small base station management unit 16 of data of the small base station 40 to be preferentially connected.
- the small base station management unit 16 has the function of the “priority base station information storage unit” of the present invention.
- the small base station management unit 16 stores and manages a list of IDs of the small base stations 40 to which the mobile terminal 10 can be connected. This list may be configured by extending a functional block of a conventional mobile terminal that manages a white list notified from the network side. Thereby, the information of the small base station 40 can be managed relatively easily.
- FIG. 4 is a diagram illustrating an example of a list managed by the small base station management unit 16 of the present embodiment.
- an entry indicating the information of the small base station 40 selected as priority / non-priority notified from the orientation setting unit 14 is added to the ID list of the small base station 40 in the white list.
- non-priority means a base station that is not prioritized.
- the ID of the small base station 40 in the white list and the priority / non-priority selection result are managed in association with each other.
- processing for discarding the information on the set small base station 40 may be performed, or the small base station 40 may be included in the white list.
- a process of adding 40 information may be performed.
- the offset information holding unit 22 holds offset information used when performing cell selection.
- the offset information is transmitted from the macro base station 30.
- the offset information holding unit 22 may be configured by adding a holding area for the small base station 40 to the information holding unit of the conventional mobile terminal 10.
- the contents of the offset information holding unit 22 are updated when broadcast information including offset information is received, when offset information is received again, and the like.
- the offset information holding unit 22 may be set to discard the contents depending on conditions such as the passage of a certain time or the change of the macro base station 30.
- the offset correction information holding unit 20 holds offset correction information included in the notification information.
- the offset correction information holding unit 20 is updated when the mobile terminal 10 receives the offset correction information again.
- the offset correction information holding unit 20 may be set to discard the contents depending on conditions such as a certain time lapse or a change in the macro base station 30.
- the offset information correction processing unit 18 has a function of correcting offset information used for determination of cell selection when priority connection is set for the small base station 40 that is a candidate for cell selection.
- the offset information correction processing unit 18 refers to the data held in the small base station management unit 16 and becomes an object. It is confirmed whether or not priority connection is set for the small base station 40.
- the offset information correction processing unit 18 corrects the offset information read from the offset information holding unit 22 with the offset correction information read from the offset correction information holding unit 20.
- the offset information correction processing unit 18 inputs the corrected offset information to the cell selection unit 24, and controls the cell selection unit 24 to perform cell selection using the corrected offset information.
- the cell selection unit 24 is controlled to perform cell selection using the offset information held in the offset information holding unit 22.
- the ID of the small base station 40 is unique among the small base stations 40 that can be detected by the mobile terminal 10. Therefore, for example, the small base station 40 can be uniquely identified by receiving the ID of the small base station 40 included in the broadcast information notified from the small base station 40.
- the broadcast information of the small base station 40 that is the measurement target (cell selection target) is confirmed in advance before the start of quality measurement (at the start of the connection cell selection procedure). For example, information that can uniquely identify the small base station 40 can be received.
- the small base station 40 may be uniquely or highly accurately identified by combining a plurality of ID structures and other information. For example, when only an ID that can be duplicated is received by associating the position information (such as a macro base station ID) with an ID that can uniquely identify the small base station 40 and an ID that can be used redundantly Alternatively, an ID that can uniquely identify the small base station 40 with high accuracy may be derived from the position information.
- the cell selection unit 24 has a function of performing cell selection based on a measurement result of signal reception quality from the macro base station 30, the small base station 40, or the like.
- the cell selection unit 24 according to the present embodiment performs cell selection using the corrected offset information for the small base station 40 specified by the offset information correction processing unit 18.
- the macro base station 30 has a basic communication function 32 and an offset generation unit 34.
- the macro base station 30, like the conventional macro base station 30, has a data transmission / reception unit, a setting information (including offset information) notification function for reception quality measurement, and a white list. It also has a notification function, a handover decision function, and the like.
- the offset generation unit 34 has a function of generating offset information used for cell selection to the small base station 40 and notifying the mobile terminal 10.
- the “offset information” is offset information for the small base station 40 for which priority connection setting by the user is not made.
- This offset information is a value set by each macro base station 30 and is controlled to be an appropriate value in the cell C formed by the macro base station 30.
- the application target of the offset information is all the mobile terminals 10 in the cell, and the content is offset information for the entire small base station 40 in the cell. Accordingly, the offset information does not require the ID of the mobile terminal 10 or the ID of the small base station 40, and can be notified with a relatively small amount of data.
- the offset generation unit 34 includes an offset correction information generation unit 36.
- the offset correction information generation unit 36 has a function of generating offset correction information and notifying the mobile terminal 10.
- the offset correction information is information for correcting the offset information so that the small base station 40 for which priority connection is set is easily selected, and indicates an allowable correction amount.
- the offset correction information is also a value set in each macro base station 30, and is controlled to be an appropriate value in a cell formed by the macro base station 30.
- the application target of the offset correction information is all the mobile terminals 10 in the cell, and the content is offset correction information for an arbitrary small base station 40 selected by the mobile terminal 10. Therefore, the offset correction information does not require the ID of the mobile terminal 10 or the ID of the small base station 40, and can be notified with a relatively small data amount.
- the macro base station 30 transmits the offset information and the offset correction information all at once to the mobile terminals 10 existing in the cell by broadcasting.
- FIG. 5 is a diagram illustrating an example of broadcast information transmitted by the macro base station 30.
- the macro base station 30 transmits broadcast information including offset information and offset correction information by broadcasting.
- the offset correction information is reported as additional information of offset information included in setting information for reception quality measurement.
- this broadcast information for example, SIB4 (System Information Block 4) can be used.
- the offset correction information may be separately included in the setting information for measuring the reception quality in the notification information from the macro base station 30 instead of being added to the offset information.
- FIG. 6 is a diagram illustrating the operation of the mobile terminal 10.
- the mobile terminal 10 first receives a preference setting from the user (S10). Specifically, the setting of the small base station 40 that the user wants to connect with priority is received, and the set ID of the small base station 40 is stored. That is, as shown in FIG. 4, the mobile terminal stores information indicating that the target small base station 40 is preferentially connected to the list of IDs of the small base stations 40.
- S10 preference setting from the user
- the set ID of the small base station 40 is stored. That is, as shown in FIG. 4, the mobile terminal stores information indicating that the target small base station 40 is preferentially connected to the list of IDs of the small base stations 40.
- a small base station 40 to be preferentially connected is received in response to input from a user.
- priority is given to a list of small base station 40 IDs by another method. You may save the connection settings.
- priority connection For example, for a home base station installed at the user's home, it may be set that priority connection is performed without input from the user. If the small base station 40 has user attributes (for example, age group), the small base station 40 attribute is compared with the user attribute of the mobile terminal 10 to determine the user attribute. A priority connection may be set for the matching small base station 40.
- user attributes for example, age group
- the mobile terminal 10 receives the offset information and offset correction information transmitted from the macro base station 30 (S12), holds the received offset information in the offset information holding unit 22, and stores the offset correction information in the offset correction information holding unit 20 Hold on.
- the mobile terminal 10 measures the reception quality of the neighboring base stations and receives the measured base station ID of the base station from the broadcast information (S14). The mobile terminal 10 determines whether or not the base station that is the transmission source of the broadcast information is the small base station 40 from the received broadcast information (S16). If the base station of the adjacent cell is not the small base station 40 (NO in S16), the mobile terminal 10 performs cell selection from the macro base station 30 to another macro base station 30. Process by.
- the mobile terminal 10 determines the transmission source of the broadcast information based on the data managed by the small base station management unit 16 It is determined whether or not the ID of the base station matches the ID of the base station for which priority connection is set (S18). As a result, when the base station IDs match (YES in S18), the mobile terminal 10 uses the offset information held in the offset information holding unit 22 as the offset correction information held in the offset correction information holding unit 20. (S20). If the base station IDs do not match (NO in S18), the process proceeds to the next process without correcting the offset information.
- the mobile terminal 10 determines the measurement value by adding the offset information read from the offset information holding unit 22 or the offset information corrected by the offset information correction processing unit 18 to the reception quality of each cell that is a candidate for cell selection. (S22).
- the mobile terminal 10 selects a cell based on the measured value after the offset (S24).
- reception quality to be measured reception power of a known signal (for example, a reference signal or a pilot signal) is used.
- the mobile terminal 10 corrects offset information using offset correction information when a cell is selected for the small base station 40 for which priority connection is set by the user. As a result, the mobile terminal 10 does not negotiate with the macro base station 30 how much priority is given to the specific small base station 40, and based on the priority setting for the specific small base station 40 based on the user's intention. Cell selection can be performed.
- the degree of priority that can be set by the mobile terminal 10 can be controlled as a basic setting standard.
- the offset information and the offset correction information are common to all the mobile terminals 10 and all the small base stations 40, and the ID of the mobile terminal 10 and the ID of the small base station 40 are not necessary. Can be suppressed.
- the orientation setting unit 14 of the mobile terminal 10 may set an upper limit value for the number of small base stations 40 that accepts setting of priority connection. This upper limit value may be preset and stored in the mobile terminal 10. Further, the macro base station 30 may notify the mobile terminal 10 of the information on the upper limit value during communication, and the mobile terminal 10 may receive and store the information notified from the macro base station 30. When notifying from the macro base station 30, notification may be made according to the situation. As the notification method, broadcast information may be used, or individual notification may be performed.
- the upper limit value is added to the number of small base stations 40 to which the offset correction information can be applied to the offset information under a condition such as within the same macro base station 30 for a certain period of time.
- an upper limit value can be set for the mobile terminal 10 when it becomes a state that requires advance or control. As a result, it becomes possible to manage the mobile terminal 10 (the cause of interference in the cell) that performs transmission with higher transmission power than usual in the cell formed by the macro base station 30.
- the mobile terminal 10a and the macro base station 30a controls the timing for permitting cell selection based on the priority connection setting.
- FIG. 7 is a diagram illustrating a configuration of the macro base station 30a according to the second embodiment.
- the macro base station 30a according to the second embodiment includes a usability information generation unit 38 in addition to the configuration of the macro base station 30 according to the first embodiment.
- the usability information generation unit 38 may correct the offset information with the offset correction information when the mobile terminal 10a selects a cell for the small base station 40 based on the current cell operation status or control from the network side.
- the usability information is 1-bit to several-bit flag information, and this usability information is used to display the availability of the offset correction information from time to time.
- This availability information indicates, for example, that the offset correction information can be used based on the fact that the interference when the mobile terminal 10a transmits with strong transmission power is within the allowable range.
- the availability information is set, and the small base station 40 in the cell formed by the current macro base station 30a is operated in a frequency band different from that of the macro base station 30a, so that it is not greatly affected by interference. From the above, it is possible to set availability information indicating that the offset correction information can be used. Since such a situation is considered to vary depending on time and environment, it is desirable that the macro base station 30a can be uniquely set at different timings.
- the usability information generation unit 38 continuously notifies the usability information at a cycle according to the frequency of control from the network side and the need for quick response.
- FIG. 8 is a diagram illustrating an example of broadcast information transmitted by the macro base station 30a.
- the macro base station 30a according to the second embodiment transmits the availability information included in the setting information for measuring reception quality in the short-period broadcast information.
- short-period notification information for example, SIB1 can be used.
- FIG. 9 is a diagram illustrating a configuration of the mobile terminal 10a according to the second embodiment.
- the basic configuration of the mobile terminal 10a according to the second embodiment is the same as that of the mobile terminal 10 according to the first embodiment. However, in the second embodiment, the offset information correction processing unit 18 checks whether or not it can be used. A portion 26 is provided.
- the availability check unit 26 is included in the broadcast information when the offset information correction processing unit 18 refers to the small base station management unit 16 to check whether priority / non-priority correction is selected. It has a function of confirming the state of the availability information and determining whether or not the offset correction information to be used can be used at the present time. As a result, when the use of the offset correction information is permitted, cell selection is performed using the offset correction information corrected by the offset information correction processing unit 18, and when the use is not permitted, the offset information holding unit 22 Cell selection is performed using the stored offset information.
- FIG. 10 is a diagram illustrating an operation of the mobile terminal 10a according to the second embodiment.
- the basic operation of the mobile terminal 10a according to the second embodiment is the same as that of the mobile terminal 10 according to the first embodiment, but whether or not the offset correction information may be used.
- a process for determining is added (S17).
- the mobile terminal 10a acquires the availability information from the short-period broadcast information (system information), and whether or not the use of the offset correction information is permitted based on the acquired availability information. Determine whether. When the use is permitted, the offset information and the offset correction information may be acquired for updating as necessary.
- system information short-period broadcast information
- the offset information and the offset correction information may be acquired for updating as necessary.
- the determination as to whether or not the offset correction information can be used is performed before the determination of the base station ID. However, the determination as to whether or not the offset correction information can be used is based on the determination of the base station ID (S18). It may be done later.
- the macro base station 30a of the second embodiment notifies whether or not priority connection according to the user's intention is permitted by using availability information, and the mobile terminal 10a performs priority connection based on the availability information. Decide whether to do it. Thereby, the operator (for example, mobile operator) of the macro base station 30a can control whether or not to permit priority connection according to the situation at the time when the mobile terminal 10a performs cell selection.
- giving priority to the connection to the small base station 40 over the macro base station 30a means that communication between the mobile terminal 10a and the small base station 40 is normal (when there is no preferential connection). Therefore, there is a possibility of connection even under poor communication quality such as radio wave interference and a relatively small distance to the small base station 40, that is, transmission from the mobile terminal 10a may be performed. Therefore, the mobile terminal 10a may need to communicate with the small base station 40 by increasing the transmission power in order to ensure sufficient communication quality. Since the cell formed by the small base station 40 is often included in the cell formed by the macro base station 30a, the mobile terminal 10a increases the transmission power for transmission to connect to the small base station 40.
- control using the availability information for example, it is possible to perform control such as permitting in a residential area at night and giving priority to interference control during the day.
- the macro base station 30a covering the residential area by controlling the availability according to the time zone, fine control is possible according to the user's activity state (the number of users outdoors, etc.).
- the availability information is generated and notified or when the user's activity is stable, the availability information that permits the use of the offset correction information is generated so that the connection to the small base station 40 at home is easier. Can be notified.
- the mobile terminal 10a is connected to the macro base station 30a so that the individual small base station 40 can be put into power saving or standby state. May be controlled.
- the basic configurations of the mobile terminal 10 and the macro base station 30 of the third embodiment are the same as the configurations of the mobile terminal 10 and the macro base station 30 of the first embodiment, but the third embodiment In the embodiment, there are a plurality of types of offset correction information.
- Each of the plurality of types of offset correction information is correction information that realizes different ease of connection depending on the priority.
- FIG. 11 is a diagram illustrating an example of a list of small base stations 40 managed by the small base station management unit 16 of the mobile terminal 10 according to the third embodiment.
- three types of priorities with different priorities of “first priority”, “second priority”, and “ ⁇ ” are set in association with the ID of the small base station 40.
- Offset correction information for facilitating connection with the highest priority is applied to the small base station 40 indicated by “first priority”, and for the small base station 40 indicated by “second priority”.
- Offset correction information for facilitating connection with second priority is applied.
- the offset correction information is not applied to the small base station 40 indicated by “ ⁇ ”.
- the macro base station 30 notifies the mobile terminal 10 of information on each offset correction information applied to “first priority” and “second priority” in addition to the offset information.
- the mobile terminal 10 allocates the ease of connection in three stages to the small base station 40 selected based on the preference setting, including the case where the broadcasted offset information is used as it is. In the present embodiment, an example having three levels of ease of connection is given, but the number of levels of ease of connection may be any number.
- a small base station 40 that is difficult to connect is set.
- the offset information is corrected so as to make it difficult to connect to the small base station 40 indicated by “Avoid”.
- the offset correction information in this case is information for shifting in the opposite direction to the offset correction information for facilitating connection to the small base station 40.
- the mobile terminal 10 and the macro base station 30 of the third embodiment can set the ease of connection to the small base station 40 in stages, fine control according to the operator, attributes, etc. of the small base station 40 Can be performed.
- an offset to which offset correction information (second priority) is applied in the cell C formed by the macro base station 30 to reflect a difference (oriented setting) from a small base station 40 outside the university campus.
- the mobile terminal 10 of a particular student has offset correction information (first priority) in order to reflect the difference (oriented setting) between the small base stations 40 in the university campus in order to give priority to the connection to the faculty building where the student is enrolled. This is realized by using offset information to which) is applied.
- offset correction information first priority
- the offset correction information (second priority) uses normal offset correction information broadcast by the macro base station 30, and then the small base station when the mobile terminal 10 is connected to the small base station 40 in the university campus.
- the information corresponding to the offset correction information (first priority) 40 is notified (newly / added), and it is possible for the installer of the small base station 40 on the university campus to control fine control. It may become.
- the small base station 40 in the university campus notifies the (additional) offset correction information, so that the resources as a whole.
- the macro base station 30 side mobile operator side
- Such a method is a case where the user is moving using a car, a train, etc., and the user's intention is in the connection destination determination using only the moving speed etc. performed on the network side due to a temporary stop or the like. This is also effective when it is desired to prevent connection to a small base station 40 that is not (a simple passing point).
- the usage information may differ from the case of only offset correction information that facilitates connection.
- the availability information is performed for the purpose of interference control, even if the offset correction information for making connection difficult is applied to the offset information, the interference is not increased. In such a case, it is desirable to separately notify the availability information as in the case of the availability information having a plurality of levels.
- the upper limit value of the number of small base stations 40 to which the offset correction information can be applied also in the above-described third embodiment, as in the first embodiment. It is good also as setting. In this case, an upper limit value may be determined for each priority.
- the configuration of the availability information of the second embodiment described above can be applied to the third embodiment.
- the influence on the macro base station 30 when the mobile terminal 10 needs to increase the transmission power for communication is also different.
- Setting to be easier to connect corresponds to the mobile terminal 10 making a connection even in a radio wave situation that requires more transmission power to the target small base station 40. It is desirable to be able to control in stages such as a situation where use is permitted up to offset correction information (second priority) and a situation where use is permitted up to offset correction information (first priority).
- the macro base station 30 transmits offset information common to all the mobile terminals 10 and transmits different offset correction information for each small base station 40 reflecting the individual settings of the mobile terminals 10.
- the basic configurations of the mobile terminal 10 and the macro base station 30 according to the fourth embodiment are the same as the configurations of the mobile terminal 10 and the macro base station 30 according to the first embodiment.
- the mobile terminal 10 requests the change of the offset information to the small base station 40 related to the setting change according to the change of the user-oriented setting.
- the network side broadcasts the offset information that the mobile terminal 10 uses to determine the connection of the small base station 40 via the macro base station 30.
- the network side individually notifies each mobile terminal 10 through the macro base station 30 of a list of offset correction information to be corrected when determining the connection of each small base station 40.
- the mobile terminal 10 When the mobile terminal 10 discovers the small base station 40, the mobile terminal 10 selects a cell using a value obtained by correcting the offset information received from the macro base station 30 with the offset correction information corresponding to the found small base station 40. .
- the macro base station 30 reflects individual settings of the mobile terminal 10, transmits different offset information for each small base station 40, and transmits offset correction information common to all the mobile terminals 10.
- the basic configurations of the mobile terminal 10 and the macro base station 30 of the fifth embodiment are the same as the configurations of the mobile terminal 10 and the macro base station 30 of the first embodiment.
- the network side broadcasts a list of IDs of the small base stations 40 corresponding to the offset information used for connection determination of each small base station 40 via the macro base station 30.
- the network side individually notifies the offset correction information that each mobile terminal 10 corrects when determining the connection of the small base station 40 via the macro base station 30.
- the mobile terminal 10 finds the small base station 40, the mobile terminal 10 selects a cell using the offset information received from the macro base station 30 and the offset correction information corresponding to the found small base station 40.
- the mobile terminal 10a Next, the mobile terminal 10a according to the sixth embodiment of the present invention will be described.
- the example in which the availability information is applied to the cells of all the mobile terminals 10a and all the small base stations 40 has been described.
- the small base station 40 By setting whether or not the offset information and the offset correction information can be used in consideration of interference for each cell, whether or not the offset information and the offset correction information can be applied is set for each cell of the small base station 40.
- the offset information and the offset correction information are set based on information values called intra-frequency cell reselection indicator (IFRI) bits broadcast from the cell of the small base station 40.
- IFRI intra-frequency cell reselection indicator
- the IFRI bit is information indicating to which cell the mobile terminal 10a selects the cell when the cell of the small base station 40 having the best reception quality for the mobile terminal 10a has no access permission for the mobile terminal 10a. It is. For example, when the mobile terminal 10 does not have access permission for the cell of the small base station 40 having the best reception quality among the detected cells, the mobile terminal 10a refers to the IFRI bit included in the broadcast information of the cell. .
- the mobile terminal 10a confirms the contents of the IFRI bit by the availability confirmation unit 26.
- the IFRI bit is “allowed”
- the mobile terminal 10a selects a cell for another cell with good reception quality within the same frequency without changing the currently used frequency.
- the increase in the interference between the uplink and the downlink can be reduced by prohibiting the use of the offset information and the offset correction information.
- the IFRI bit is “non-allowed”
- the mobile terminal 10a changes the currently used frequency and selects a cell for another frequency.
- offset information and offset correction information can be used. According to the present embodiment, for each cell of the small base station 40, it is possible to perform offset control more flexibly considering interference.
- the basic configuration of the mobile terminal 10a according to the sixth embodiment is the same as that of the mobile terminal 10a according to the second embodiment.
- the basic configuration of the macro base station of the sixth embodiment is the same as that of the macro base station 30 of the first embodiment.
- the small base station 40 transmits an IFRI bit as broadcast information.
- Different small base stations 40 may be operated in different frequency bands.
- the cell selection ease is changed to change the cell It may be necessary to control the selection.
- the offset correction information can be easily controlled by using it as information for changing the priority of the same frequency band / different frequency band.
- the notified offset information is offset information for use in the small base station 40 operated in the same frequency band, and when used in the small base station 40 operated in a different frequency band, First, the offset information is corrected by the offset correction information, and the corrected offset information obtained can be used.
- This offset correction information is notified separately (in a distinguishable manner) from the offset correction information applied to the small base station 40 selected based on the user-oriented setting described above, and the correction can be applied independently. It may be.
- priority control can be easily performed, and the frequency that the small base station 40 operates according to the situation. Even if the belt is changed, it becomes possible to respond flexibly.
- the offset correction information may have different settings for each macro base station 30.
- the offset information is different for each macro base station 30, or depending on the small base station 40 in the cell formed by the macro base station 30 (because different small base stations 40 exist for each cell).
- the mobile terminal 10 stores the information as an information element that is read (re-received) every time the macro base station 30 is changed.
- the offset correction information may be notified of different settings depending on the time zone, even if the mobile terminal 10 and the network side are not transmitting data (idle state), the mobile terminal 10 is constant. When the time has elapsed, it is desirable to reread (re-receive) the offset correction information.
- the macro base station 30 changes the offset correction information at any timing and changes it. For example, it is preferable that paging can be transmitted (the mobile terminal 10 receives) so that the mobile terminal 10 can be instructed to receive the new value again.
- the mobile terminal 10 selects a cell from the currently connected small base station 40 to another small base station 40, or the mobile terminal 10 receives a macro from the small base station 40.
- the small base station 40 transmits offset information and offset correction information different from those of the macro base station 30, and the mobile terminal 10 receives them for updating or updating or small base station 40.
- the information may be stored and used as offset information and offset correction information received from.
- another cell selection tendency is added to the cell selection between the small base stations 40, the user's preference setting regarding stay in the small base station 40 is reflected, or the same frequency band / different frequency band is distinguished.
- the correction information can be added from the small base station 40.
- group notification in units of groups in which a plurality of mobile terminals 10 are grouped may be used.
- the offset information and the offset correction information are transmitted by broadcast has been described.
- the offset information and / or the offset correction information are individually notified by unicast. It is good to do.
- the offset correction information has been described on the premise that the value is shifted by adding or subtracting the offset information, but information for replacing the offset information itself can also be notified. That is, the first offset information when priority connection is performed and the second offset information when priority connection is not performed may be notified.
- a plurality of offset information such as first offset information, second offset information, third offset information, etc. may be transmitted. In this case, the amount of information to be notified increases, but since the applied offset itself is notified, the configuration for changing the offset information at the mobile terminal is simplified.
- the mobile terminal may be composed of a plurality of communication devices. For example, when an extrapolation type or embedded type 3GPP communication device module or non-3GPP communication device module is mounted on an electronic computer such as a personal computer.
- the present invention has the same effect even in such various mobile terminals.
- LSI Large Scale Integration
- IC Integrated Circuit
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of the circuit cells inside the LSI may be used.
- the present invention has an excellent effect that it is possible to adjust the degree to which a priority home base station is easily selected, and a plurality of cells existing in a wide area are covered by a cell that covers a wide area. It is useful as a mobile terminal or a macro base station that performs cell selection control in a network having the same.
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Abstract
Description
図1は、第1の実施の形態の移動端末10の構成を示す図、図2はマクロ基地局30の構成を示す図である。図1、図2を用いて、移動端末10およびマクロ基地局30について詳しく説明する前に、本実施の形態の移動端末10およびマクロ基地局30が適用されるネットワークについて説明する。
次に、図1を参照して、移動端末10の構成について説明する。移動端末10は、基本通信機能12と、志向設定部14と、小型基地局管理部16と、オフセット情報補正処理部18と、オフセット補正情報保持部20と、オフセット情報保持部22と、セル選択部24とを有している。基本通信機能12は、マクロ基地局およびホーム基地局からの信号の受信品質を測定する受信品質測定部13を有している。なお、図1には示していないが、移動端末10は、従来の移動端末と同様に、データ送受信部、基地局間のハンドオーバ機能部なども有する。以下、移動端末10の各構成について説明する。
次に、図2を参照して本実施の形態のマクロ基地局30の構成について説明する。マクロ基地局30は、基本通信機能32と、オフセット生成部34とを有している。なお、図2には示していないが、マクロ基地局30は、従来のマクロ基地局30と同様に、データ送受信部、受信品質測定のための設定情報(オフセット情報を含む)通知機能、ホワイトリスト通知機能、ハンドオーバ決定機能なども有する。
次に、本発明の第2の実施の形態の移動端末10aおよびマクロ基地局30aについて説明する。第2の実施の形態においては、マクロ基地局30aは、優先接続設定に基づくセル選択を許可するタイミングを制御する。
次に、本発明の第3の実施の形態の移動端末10およびマクロ基地局30について説明する。第3の実施の形態の移動端末10およびマクロ基地局30の基本的な構成は、第1の実施の形態の移動端末10およびマクロ基地局30の構成と同じであるが、第3の実施の形態においては、複数種類のオフセット補正情報を有する。複数種類のオフセット補正情報はそれぞれ、優先度に応じて異なる接続のしやすさを実現する補正情報である。
次に、本発明の第4の実施の形態の移動端末およびマクロ基地局について説明する。上記した第1~第3の実施の形態においては、全移動端末10および全小型基地局40に共通のオフセット情報およびオフセット補正情報を用いる例について説明したが、第4の実施の形態においては、マクロ基地局30は、全移動端末10に共通のオフセット情報を送信すると共に、移動端末10個別の設定を反映した小型基地局40毎に異なるオフセット補正情報を送信する。
次に、本発明の第5の実施の形態の移動端末およびマクロ基地局について説明する。上記した第1~第3の実施の形態においては、全移動端末10および全小型基地局40に共通のオフセット情報およびオフセット補正情報を用いる例について説明したが、第5の実施の形態においては、マクロ基地局30は、移動端末10個別の設定を反映し、小型基地局40毎に異なるオフセット情報を送信する共に、全移動端末10に共通のオフセット補正情報を送信する。
次に、本発明の第6の実施の形態の移動端末10aについて説明する。上記した第2の実施の形態においては、全移動端末10aおよび全小型基地局40のセルに使用可否情報を適用する例について説明したが、第6の実施の形態においては、小型基地局40のセル個別に干渉を考慮してオフセット情報およびオフセット補正情報の使用の可否を設定することで、小型基地局40のセル毎にオフセットの情報およびオフセット補正情報の適用の可否を設定する。
12 基本通信機能
14 志向設定処理部
16 小型基地局管理部
18 オフセット情報補正処理部
20 オフセット補正情報保持部
22 オフセット情報保持部
24 セル選択部
26 使用可否情報確認部
30,30a マクロ基地局
32 基本通信機能
34 オフセット生成部
36 オフセット補正情報生成部
38 使用可否情報生成部
40a~40c 小型基地局
Claims (14)
- マクロ基地局と複数のホーム基地局を有するネットワークにおいて用いられる移動端末であって、
前記マクロ基地局および前記ホーム基地局から送信された信号の受信品質を測定する受信品質測定部と、
セル選択に用いるオフセット情報を前記マクロ基地局から受信するオフセット情報受信部と、
前記マクロ基地局からブロードキャストにより送信される、前記オフセット情報を補正するオフセット補正情報を受信するオフセット補正情報受信部と、
前記複数のホーム基地局のうち優先接続する少なくとも一つの優先ホーム基地局の情報を記憶する優先基地局情報記憶部と、
前記優先ホーム基地局を検知したときに、前記オフセット情報を前記オフセット補正情報によって補正するオフセット情報補正部と、
前記受信品質に、前記オフセット情報受信部にて受信したオフセット情報または前記オフセット情報補正部にて補正されたオフセット情報を加え、オフセット情報を加えた受信品質に基づいてセル選択を行うセル選択部と、
を備える移動端末。 - 設定可能な前記優先ホーム基地局の個数の上限値を記憶した上限値記憶部を備える請求項1に記載の移動端末。
- 前記上限値を示すデータを、前記第マクロ基地局から受信する上限値受信部を備え、
前記上限値受信部にて受信した上限値のデータを前記上限値記憶部に記憶する請求項2に記載の移動端末。 - 前記オフセット補正情報を使用してよいか否かを示す使用可否(availability)情報を含む報知情報を、前記第マクロ基地局から受信する報知情報受信部を備え、
前記セル選択部は、前記優先ホーム基地局を検知したときに、前記報知情報に含まれる使用可否情報に基づいて、前記オフセット補正情報の使用可否を判定する請求項1~3のいずれかに記載の移動端末。 - 前記オフセット補正情報受信部は、前記優先ホーム基地局に接続しやすくする度合いが異なる複数のオフセット補正情報を受信する請求項1~4のいずれかに記載の移動端末。
- 前記第マクロ基地局は3GPPで規定されるeNodeBであり、前記ホーム基地局は3GPPで規定されるHome eNodeBである請求項1~5のいずれかに記載の移動端末。
- 配下のセル内に複数のホーム基地局を含むマクロ基地局であって、
セル選択に用いるオフセット情報を前記移動端末に送信するオフセット情報送信部と、
前記オフセット情報を補正するオフセット補正情報をブロードキャストにより前記移動端末に送信するオフセット補正情報送信部と、
を備えるマクロ基地局。 - 複数のホーム基地局のうち、優先接続を希望する優先ホーム基地局として設定可能な個数の上限値を示すデータを、前記移動端末に送信する上限値送信部を備える請求項7に記載のマクロ基地局。
- 前記オフセット補正情報を使用してよいか否かを示す使用可否情報を含む報知情報を、前記移動端末に送信する報知情報送信部を備える請求項7または8に記載のマクロ基地局。
- 前記オフセット補正情報送信部は、前記優先ホーム基地局に接続しやすくする度合いが異なる複数のオフセット補正情報を前記移動端末に送信する請求項7~9のいずれかに記載のマクロ基地局。
- 前記ホーム基地局は3GPPで規定されるHome eNodeBである請求項7~10のいずれかに記載のマクロ基地局。
- マクロ基地局と複数のホーム基地局を有するネットワークにおいて移動端末によるセルの選択を制御するためのシステムであって、
前記第マクロ基地局は、
セル選択に用いるオフセット情報を前記移動端末に送信するオフセット情報送信部と、
前記オフセット情報を補正するオフセット補正情報をブロードキャストにより前記移動端末に送信するオフセット補正情報送信部と、
を備え、
前記移動端末は、
前記マクロ基地局および前記ホーム基地局から送信された信号の受信品質を測定する受信品質測定部と、
前記第マクロ基地局から前記オフセット情報を受信するオフセット情報受信部と、
前記第マクロ基地局から前記オフセット補正情報を受信するオフセット補正情報受信部と、
前記複数のホーム基地局のうち優先接続する少なくとも一つの優先ホーム基地局の情報を記憶する優先基地局情報記憶部と、
前記優先ホーム基地局を検知したときに、前記オフセット情報を前記オフセット補正情報によって補正するオフセット情報補正部と、
前記受信品質に、前記オフセット情報受信部にて受信したオフセット情報または前記オフセット情報補正部にて補正されたオフセット情報を加え、オフセット情報を加えた受信品質に基づいてセル選択を行うセル選択部と、
を備えるセル選択システム。 - マクロ基地局と複数のホーム基地局を有するネットワークにおいて用いられる移動端末によるセル選択方法であって、
セル選択に用いるオフセット情報を前記マクロ基地局から受信するステップと、
前記マクロ基地局からブロードキャストにより送信される、前記オフセット情報を補正するオフセット補正情報を受信するステップと、
前記複数のホーム基地局のうち優先接続する少なくとも一つの優先ホーム基地局の情報を優先基地局情報記憶部に記憶するステップと、
前記マクロ基地局および前記ホーム基地局から送信された信号の受信品質を測定するステップと、
前記優先ホーム基地局を検知したときに、前記オフセット情報を前記オフセット補正情報によって補正するステップと、
前記受信品質に、前記マクロ基地局から受信したオフセット情報または前記オフセット補正情報によって補正されたオフセット情報を加え、オフセット情報を加えた受信品質に基づいてセル選択を行うステップと、
を備えるセル選択方法。 - 配下のセル内に複数のホーム基地局を含むマクロ基地局によって、移動端末のセル選択を制御する方法であって、
セル選択に用いるオフセット情報を前記移動端末に送信するステップと、
前記オフセット情報を補正するオフセット補正情報をブロードキャストにより前記移動端末に送信するステップと、
を備えるセル選択制御方法。
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