WO2022050232A1 - 周波数帯域の優先度に従ってセル選択を実行する端末装置、その制御方法、およびプログラム - Google Patents
周波数帯域の優先度に従ってセル選択を実行する端末装置、その制御方法、およびプログラム Download PDFInfo
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- WO2022050232A1 WO2022050232A1 PCT/JP2021/031781 JP2021031781W WO2022050232A1 WO 2022050232 A1 WO2022050232 A1 WO 2022050232A1 JP 2021031781 W JP2021031781 W JP 2021031781W WO 2022050232 A1 WO2022050232 A1 WO 2022050232A1
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- terminal device
- priority
- information
- predetermined function
- cell
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- 238000000034 method Methods 0.000 title claims description 20
- 238000004891 communication Methods 0.000 claims description 71
- 238000005259 measurement Methods 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 20
- 230000009977 dual effect Effects 0.000 claims description 11
- 230000002776 aggregation Effects 0.000 claims description 8
- 238000004220 aggregation Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 description 178
- 230000008569 process Effects 0.000 description 12
- 238000012545 processing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000010267 cellular communication Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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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
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
-
- 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
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the present invention relates to a cell selection control technique in a cellular communication system.
- the terminal device in the non-connected state executes cell selection to select the cell to be connected when transitioning to the connected state as necessary.
- the release 16 standard of the 3rd Generation Partnership Project (3GPP) proposes a technique for selecting a cell to be connected from a plurality of cells operated in a plurality of different frequency bands.
- a predetermined function can be used only in a predetermined frequency band.
- the long-term evolution (LTE) base station uses the first frequency band on condition that it supports EUTRA-NR Dual Connectivity (EN-DC), and the second when it does not support EN-DC.
- Settings such as using the frequency band of are possible.
- Non-Patent Document 1 assuming such a setting, it is possible to specify a priority for a terminal device corresponding to EN-DC in order to indicate a frequency band for preferentially searching for a connection destination cell. Are listed.
- the terminal device that executes a predetermined function searches for a connection destination cell in the priority frequency band based on the specified priority. On the other hand, even if the base station device can provide a predetermined function in the frequency band, when the terminal device is connected to the base station device, the predetermined function may not be executed due to, for example, parameter limitation. It is possible.
- the present invention provides a technique that enables a terminal device to appropriately select a connection destination cell according to a function to be executed.
- the terminal device is a terminal device that selects a cell to be connected from a plurality of cells formed by one or more base station devices, and is a connection destination cell with respect to a plurality of frequency bands.
- the first information indicating the priority at the time of selecting is acquired, and the base station apparatus is used in a predetermined frequency band of the plurality of frequency bands from each of the one or more base station apparatus.
- the cell to connect to is selected according to the first priority that is not changed from the priority indicated by the first information, or the second that is changed from the priority indicated by the first information. It has a determination means for determining whether to select a cell to be connected according to a priority, and an execution means for executing selection of a cell to be connected according to the determination by the determination means.
- the terminal device is a terminal device that selects a cell to be connected from a plurality of cells formed by one or more base station devices, and is connected with respect to a plurality of frequency bands.
- An acquisition means for acquiring first information indicating a priority when selecting a destination cell, and in which of the plurality of frequency bands the one or more base station devices can perform a predetermined function. Based on the second information shown and the frequency band in which the terminal device can perform the predetermined function, the first priority that is not changed from the priority indicated by the first information.
- the determination means for determining whether to select the connection destination cell according to the degree or the connection destination cell according to the second priority changed from the priority indicated by the first information, and the determination means. It has an execution means for executing selection of a cell to be connected according to a decision.
- the terminal device can appropriately select the cell to be connected according to the function to be executed.
- FIG. 1 is a diagram showing a configuration example of a wireless communication system.
- FIG. 2 is a diagram showing an example of hardware configuration of a terminal device.
- FIG. 3 is a diagram showing a functional configuration example of the terminal device.
- FIG. 4 is a diagram illustrating a flow of processing executed by the terminal device.
- FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment.
- the wireless communication system includes a base station device 101 and a terminal device 102. Although only two base station devices 101 and one terminal device 102 are shown in FIG. 1, the number of these is not limited to this. That is, the following discussion can be applied to a wireless communication system including one or more base station devices 101 and one or more terminal devices 102, and the number thereof is not particularly limited.
- the base station device 101 can be configured to be able to provide communication services in the 800 MHz band and the 3.5 GHz band, for example.
- the base station apparatus 101 forms, for example, a cell 111 capable of providing a communication service in the 800 MHz band and a cell 112 capable of providing a communication service in the 3.5 GHz band, and exists within the range of each cell.
- a communication service is provided to the terminal device 102. Note that this is an example, and there may be a base station device capable of providing a communication service only in the 800 MHz band or only in the 3.5 GHz band, or a base station device capable of providing a communication service in another frequency band. May exist.
- the present wireless communication system by forming a plurality of cells using a plurality of frequency bands, it is possible to provide a communication service to the terminal device 102 using at least one of the plurality of frequency bands.
- One or more base station devices 101 are configured and arranged.
- the base station device 101 may be set with a communication function that can be executed in each frequency band, for example, by a communication carrier.
- each of the base station devices 101 can be configured to be capable of performing the narrowband communication function in the 800 MHz band and not to perform the narrowband communication function in the 3.5 GHz band.
- communication is performed using a frequency bandwidth of 20 MHz
- narrow band communication communication is performed using a frequency bandwidth of 1.4 MHz. According to such narrow band communication, communication with low power consumption becomes possible.
- narrowband communication can be used for Machine Type Communication (MTC). Geographically wide coverage may often be required for such applications.
- MTC Machine Type Communication
- a telecommunications carrier can, for example, execute a narrow band communication function in the 800 MHz band with a wide coverage, and can execute a narrow band communication function in the 3.5 GHz band with a relatively narrow coverage. Can be avoided.
- the wireless communication system can be configured so that whether or not the narrow band communication function can be executed differs for each frequency band.
- the relationship between the frequency band and whether or not the narrow band communication function can be executed is an example.
- the narrow band communication function can be executed in the high frequency band, and the narrow band communication function is performed in the low frequency band. It may be configured so that the function is not executable.
- the base station apparatus 101 may be configured to be able to execute the narrow band communication function in any of the plurality of usable frequency bands, and may be configured to execute the narrow band communication function in any of the plurality of available frequency bands.
- the function may be configured to be non-executable.
- each of the base station devices 101 may be configured so that the early measurement reporting function can be executed in the 800 MHz band and the early measurement reporting function cannot be executed in the 3.5 GHz band.
- Early measurement report is a technology that measures the secondary cell in advance in the standby state before the start of communication and speeds up the startup of Carrier Aggregation.
- the base station device 101 instructs the terminal device 102 capable of executing the early measurement report to perform the measurement in a frequency band different from the standby frequency band in order to determine a cell that is a candidate for the secondary cell. can do.
- the base station apparatus 101 may instruct the terminal apparatus 102 to measure the 3.5 GHz band when the Early measurement report can be executed in the 800 MHz band.
- the terminal device 102 causes the terminal device 102 to execute the measurement in a frequency band different from the standby frequency band. Therefore, for example, the base station apparatus 101 makes it possible to execute an early measurement report in the 800 MHz band, which is a low frequency band in which a relatively wide range of coverage can be obtained, and the high frequency tends to have a relatively narrow coverage. In the 3.5 GHz band of the band, it may be configured so that the Early measurement report cannot be executed.
- the relationship between the frequency band and whether or not the Early measurement report function can be executed is an example.
- the Early measurement report function can be executed in the high frequency band, and the Early measurement report function can be executed in the low frequency band. It may be configured so that the function is not executable.
- the base station apparatus 101 may be configured to be able to execute the function of the Early measurement report in any of the plurality of available frequency bands, and may be configured to execute the function of the Early measurement report in any of the plurality of available frequency bands.
- the function may be configured to be non-executable.
- the base station apparatus 101 is a combination of frequency bands that can be used in Dual Connectivity (Multi-RAT Dual Connectivity, MR-DC) over a plurality of wireless access technologies (RAT) such as the above-mentioned EN-DC. Can be limited. Similarly, in Dual Connectivity and Carrier Aggregation within one RAT, the combination of frequency bands that can be used may be limited. As described above, the base station apparatus 101 can be configured to be able to execute the functions of Dual Connectivity and Carrier Aggregation only in the combination of a part of the available frequency bands.
- Dual Connectivity Multi-RAT Dual Connectivity
- RAT wireless access technologies
- the base station apparatus 101 can be set so as to be able to execute a MIMO (Multi-input Multi-output) communication function with a different number of layers for each frequency band, for example.
- the base station apparatus 101 may be configured so that a MIMO communication function having a large number of layers can be executed in a high frequency band and a MIMO communication function having a small number of layers can be executed in a low frequency band.
- the base station apparatus 101 may be configured to be able to execute available network slices, application functions, and service functions for each frequency band, for example.
- a service function that requires a wide range of coverage can be executed only in the low frequency band, and a service function that has no problem in local coverage can be executed only in the high frequency band.
- the above-mentioned functions are an example, and the base station apparatus 101 may be configured so that the enablement / disapproval is set for each frequency band or the contents that can be executed are different for the functions other than these.
- the base station apparatus 101 within at least a certain range can be set so as to be able to execute a predetermined function in a common frequency band. That is, the telecommunications carrier may set the base station device 101 so that the terminal device 102 can provide a predetermined function to the terminal device 102 by using one frequency band within a certain range.
- the terminal device 102 is configured to support communication in at least one of a plurality of frequency bands such as the 800 MHz band and the 3.5 GHz band. Further, the terminal device 102 may be configured to be able to execute functions such as narrowband communication, early measurement report, Dual Connectivity, and Carrier Aggregation. The terminal device 102 may be configured to be able to execute a function other than these exemplified functions. Further, the terminal device 102 may be capable of executing all of these illustrated functions, or may be capable of executing only a part of them. Also, in some cases, the terminal device 102 may not be able to perform any of these exemplary functions.
- the terminal device 102 may be configured to be able to execute a predetermined function only in a part (for example, one) of the frequency bands.
- the terminal device 102 may be configured to be capable of executing narrowband communication only in the 800 MHz band when the 800 MHz band and the 3.5 GH band can be used.
- the base station apparatus 101 may be configured to be capable of executing narrowband communication in the 800 MHz band and not to be capable of executing narrowband communication in the 3.5 GHz band.
- the base station apparatus 101 may be configured not to be capable of performing narrowband communication in the 800 MHz band, and may be configured to be capable of executing narrowband communication in the 3.5 GHz band.
- the base station apparatus 101 may be configured to be capable of executing narrow band communication in both the 800 MHz band and the 3.5 GHz band, or may not be capable of executing narrow band communication in both of them. The same can be said for the Early measurement report.
- the base station apparatus 101 may be configured to be capable of performing a predetermined function in a part or all of a plurality of available frequency bands, and may be capable of performing the predetermined function in any of the plurality of frequency bands. It may not be.
- the terminal device 102 may be configured to perform its predetermined function in part or all of one or more available frequency bands, and its predetermined function in any of the one or more frequency bands. It is possible that the function of is not feasible.
- the terminal device 102 acquires information indicating the priority when the terminal device 102 selects a cell to be connected to with respect to a plurality of frequency bands that can be used by the base station device 101, and the connection destination is based on the priority. You can select the cell of.
- the terminal device 102 may internally acquire information indicating the priority registered in advance inside the device or in the SIM (Subscriber Identity Module), or indicates the priority from the network at the time of location registration. Information may be obtained.
- the base station device 101 may send out a notification signal including information indicating the priority, for example, and the terminal device 102 may acquire the information indicating the priority by receiving the notification signal.
- the terminal device 102 can execute the selection of the cell to be connected when the transition to the connected state (for example, the RRC Connected state) is performed in the frequency band selected based on the priority. Then, the terminal device 102 transitions to the connected state as needed, and tries to execute communication for a predetermined function to be executed.
- the transition to the connected state for example, the RRC Connected state
- the frequency band that is prioritized when selecting a cell may not necessarily be the frequency band that can execute a predetermined function.
- the base station apparatus 101 may not be able to perform its predetermined function in the frequency band used in the cell selected by the terminal apparatus 102.
- the terminal device 102 may not be able to perform its predetermined function in the selected frequency band.
- the terminal device 102 establishes the connection in the selected cell when the connection is established, but the predetermined function cannot be executed in this cell.
- the terminal device 102 can execute a predetermined function by, for example, handing over to a cell using another frequency band, but unnecessary signaling is generated by the handover, and the time until the execution of the predetermined function is started. Can be prolonged.
- the terminal device 102 is made to acquire information about the functions that can be executed in the frequency band that can be used by the base station device 101. Then, the terminal device 102 determines whether the base station device 101 can execute a predetermined function in the frequency band, and based on the determination result, the priority is not changed from the priority acquired as described above. It is determined whether to execute the cell selection according to the priority of 1 or the cell selection according to the second priority changed from the acquired priority.
- the terminal device 102 is located in a predetermined frequency band of any one of a plurality of frequency bands that can be used by the base station device 101 from each of the one or more base station devices 101. Can obtain information indicating whether or not a predetermined function can be performed.
- the base station apparatus 101 may form a plurality of cells corresponding to each of the plurality of frequency bands. Then, the base station apparatus 101 may provide information indicating whether or not a predetermined function can be executed in one frequency band used in forming the cell in each cell. In this case, the terminal device 102 can acquire information indicating whether or not a predetermined function can be executed in the corresponding frequency band in each of the plurality of cells formed by the base station device 101.
- the terminal device 102 may acquire information indicating in which of the plurality of frequency bands a predetermined function can be executed by acquiring information in each cell corresponding to the plurality of frequency bands. Further, the base station apparatus 101 may transmit only information indicating whether or not a predetermined function can be executed in one predetermined frequency band (for example, the highest priority). That is, the base station apparatus 101 may transmit the same information in all the forming cells.
- the "cell” shall include the "beam”.
- the predetermined function may be, for example, narrow band communication or early measurement report as described above.
- the base station apparatus 101 can use the 800 MHz band and the 3.5 GHz band.
- the 3.5 GHz band is set to have a higher priority than the 800 MHz band for traffic offload. It is assumed that it has been done.
- the base station apparatus 101 notifies whether or not a predetermined function can be executed in the 3.5 GHz band.
- the base station apparatus 101 has notified that the predetermined function cannot be executed in the 3.5 GHz band.
- the terminal device 102 changes the priority so as to execute the cell selection with priority given to the 800 MHz band. That is, at this point, the terminal device 102 cannot recognize whether or not the base station device 101 can execute a predetermined function in the 800 MHz band, but can execute a predetermined function in the 800 MHz band. Because of the nature, the 800MHz band is given priority.
- the terminal device 102 cannot execute a predetermined function in the 800 MHz band, the terminal device 102 cannot execute the predetermined function even if it stands by in the 800 MHz band, so that the priority acquired in advance is not changed.
- the cell selection is executed with priority given to the 3.5 GHz band.
- the base station apparatus 101 is notified that a predetermined function can be executed in the 3.5 GHz band will be described.
- the terminal device 102 can execute a predetermined function in the 3.5 GHz band. Therefore, the terminal device 102 can execute the predetermined function in the 3.5 GHz band without changing the priority acquired in advance. Priority is given to the 5.5 GHz band and cell selection is executed. If the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band and can execute a predetermined function in the 800 MHz band, the terminal device 102 has a priority so as to execute cell selection with priority given to the 800 MHz band. To change.
- the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band, but may be able to execute a predetermined function in the 800 MHz band. That is, at this point, the terminal device 102 cannot recognize whether or not the base station device 101 can execute a predetermined function in the 800 MHz band, but can execute a predetermined function in the 800 MHz band. Because of this, the 800MHz band is prioritized for cell selection. If the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band and cannot execute a predetermined function in the 800 MHz band, the terminal device 102 executes cell selection in the 3.5 GHz band without changing the priority. Can be done. This is because even if the terminal device 102 stands by in the 800 MHz band, it cannot execute a predetermined function, so that there is no advantage in changing the priority.
- the base station apparatus 101 can use the 800 MHz band and the 3.5 GHz band.
- the 3.5 GHz band is set to have a higher priority than the 800 MHz band due to traffic offload. It shall be.
- the base station device 101 has notified that the predetermined function cannot be executed in the 800 MHz band.
- the terminal device 102 sets the acquired priority so as to give priority to the 3.5 GHz band and execute cell selection. Use as it is. That is, at this point, the terminal device 102 cannot recognize whether or not the base station device 101 can execute a predetermined function in the 3.5 GHz band, but executes a predetermined function in the 3.5 GHz band. Since it may be possible, give priority to the 3.5 GHz band.
- the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band, the terminal device 102 cannot execute the predetermined function even if it stands by in the 800 MHz band, so change from the priority acquired in advance. Instead, the cell selection is executed with priority given to the 3.5 GHz band.
- the base station apparatus 101 is notified that a predetermined function can be executed in the 800 MHz band.
- the terminal device 102 can execute a predetermined function in both the 800 MHz band and the 3.5 GHz band.
- the priority is changed so that the cell selection is executed with priority given to the 800 MHz band.
- the terminal device 102 preferentially executes the cell selection in the 800 MHz band. Change the priority.
- the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band, but can execute a predetermined function in the 800 MHz band.
- the terminal device 102 may be able to execute the predetermined function in the 3.5 GHz band. Therefore, the cell selection is executed with priority given to the 3.5 GHz band without changing from the priority acquired in advance.
- the terminal device 102 executes cell selection in the 3.5 GHz band without changing the priority. Can be done. This is because even if the terminal device 102 stands by in the 800 MHz band, it cannot execute a predetermined function, so that there is no advantage in changing the priority.
- the base station apparatus 101 can use the 800 MHz band and the 3.5 GHz band.
- the 3.5 GHz band is set to have a higher priority than the 800 MHz band due to traffic offload. It shall be. That is, in this example, the base station apparatus 101 notifies the terminal apparatus 102 of information indicating whether or not a predetermined function can be executed in each of the available frequency bands.
- the base station apparatus 101 may, for example, notify this information in each of a plurality of frequency bands, or may notify this information in one frequency band among the plurality of frequency bands.
- the terminal device 102 may execute the cell selection in the 3.5 GHz band without changing the priority.
- the priority is not changed regardless of whether or not the predetermined function can be executed in the 800 MHz band.
- the terminal device 102 if it is determined that the terminal device 102 cannot execute a predetermined function in the 3.5 GHz band and can execute a predetermined function in the 800 MHz band, priority is given to executing cell selection in the 800 MHz band. Change the degree. Further, when the terminal device 102 cannot execute a predetermined function in both the 3.5 GHz band and the 800 MHz band, the terminal device 102 executes cell selection in the 3.5 GHz band without changing the priority.
- the base station apparatus 101 notifies the terminal apparatus 102 of information indicating in which frequency band combination the predetermined function can be executed, for example, for a predetermined function using a combination of a plurality of frequency bands. sell. For example, information on a combination of frequency bands that can be used in Carrier Aggregation or Dual Connectivity (Single-RAT or Multi-RAT) is notified from each of the one or more base station devices 101 to the terminal device 102.
- the base station apparatus 101 can execute the above-mentioned predetermined function in the combination of the 700 MHz band and the 3.5 GHz band, but cannot execute the predetermined function in the combination of the 800 MHz band and the 3.5 GHz band. Information such as can be notified.
- the terminal device 102 can execute a predetermined function by the combination of the 800 MHz band and the 3.5 GHz band, but can execute the predetermined function by the combination of the 700 MHz band and the 3.5 GHz band. Otherwise, the predetermined function cannot be executed with the base station apparatus 101, so that the frequency band in which the cell selection should be executed can be determined based on the priority acquired in advance.
- the terminal device 102 is a case where the own device can execute a predetermined function in combination with the 700 MHz band and the 3.5 GHz band, and it is indicated by information acquired in advance that, for example, the 800 MHz band has a high priority. If so, the priority may be changed so that cell selection in the 700 MHz band or 3.5 GHz band is preferentially executed.
- the base station apparatus 101 may notify, for example, information on the communication capability in each of the plurality of available frequency bands.
- the base station apparatus 101 may notify the maximum number of layers of MIMO that can be set in each frequency band.
- the terminal device 102 selects a cell in a frequency band in which the maximum number of layers can be achieved based on, for example, the number of MIMO layers that can be set in each of the frequency bands that the own device can use and the notified information. You can decide whether to change the priority so that you can do it.
- the base station apparatus 101 may notify information on executable network slices, application functions, and service functions in each frequency band.
- the terminal device 102 changes the priority at the time of cell selection so that a frequency band capable of executing a predetermined network slice, application function, or service function can be selected from the frequency bands that can be used by the terminal device 102. It can be decided whether or not.
- the network slice, the application function, and the service function can be specified by the identifier of the network slice such as S-NSSAI (Single Network Slice Selection Assistance Information), Slice / Service type (SST), and Slice Differentiator (SD).
- S-NSSAI Single Network Slice Selection Assistance Information
- SST Slice / Service type
- SD Slice Differentiator
- the notification of the feasible network slice, the application function, and the service function in each frequency band may be notified by the core network device instead of the base station device.
- the Early measurement report is a function of measuring a secondary cell in advance before the start of communication as described above, but the base station apparatus 101 notifies information indicating a measurable frequency band as a candidate for the secondary cell. You may.
- the base station apparatus 101 notifies the terminal apparatus 102 of information indicating that the Early measurement report can be executed in the 3.5 GHz band, and the frequency band to which the measurement instruction can be given at that time is the 800 MHz band. Can be notified.
- the terminal device 102 supports the Early measurement report function in the 3.5 GHz band, and 3.5 GHz when the frequency band that can be measured during standby in the 3.5 GHz band is the 800 MHz band. It can be determined that the Early measurement report on the band is feasible.
- the terminal device 102 for example, when the frequency band that can be measured during standby in the 3.5 GHz band is the 700 MHz band and measurement in the 800 MHz band cannot be performed, an Early measurement report in the 3.5 GHz band is issued. It can be determined that it cannot be executed. Then, the terminal device 102 can determine whether or not to change the priority based on the determination result.
- the base station device 101 may notify the terminal device 102 of the changed priority information used when the terminal device 102 changes the priority. That is, the terminal device 102 can acquire information indicating a plurality of priorities and determine which priority is to be used as described above.
- the priority after the change for example, the frequency band in which the predetermined function can be executed has the highest priority, the frequency band in which the predetermined function can be executed has the next highest priority, and the predetermined function is executed.
- the frequency band that cannot be determined can be determined to have the lowest priority. If a predetermined function can be executed in a plurality of frequency bands, the frequency band having the highest priority in the priority before the change has the highest priority among the frequency bands after the change. Priority can be configured.
- the terminal device 102 includes a processor 201, a ROM 202, a RAM 203, a storage device 204, and a communication circuit 205.
- the processor 201 is a computer including one or more processing circuits such as a general-purpose CPU (central processing unit) and an ASIC (integrated circuit for a specific application), and is stored in a ROM 202 or a storage device 204.
- a general-purpose CPU central processing unit
- ASIC integrated circuit for a specific application
- the ROM 202 is a read-only memory that stores information such as programs and various parameters related to processing executed by the terminal device 102.
- the RAM 203 is a random access memory that functions as a workspace when the processor 201 executes a program and stores temporary information.
- the storage device 204 is configured by, for example, a detachable external storage device or the like.
- the communication circuit 205 is composed of, for example, a circuit for LTE or 5G wireless communication. Although one communication circuit 205 is shown in FIG. 2, the terminal device 102 may have a plurality of communication circuits (for example, for LTE and 5G).
- the terminal device 102 may have a separate communication circuit 205 for each of the plurality of usable frequency bands, or may have a common communication circuit 205 for at least a part of those frequency bands. May be good. Further, the terminal device 102 may have not only the communication circuit 205 for cellular communication but also the communication circuit 205 corresponding to other wireless communication standards such as wireless LAN.
- FIG. 3 is a diagram showing a functional configuration example of the terminal device 102.
- the terminal device 102 has, for example, a priority information acquisition unit 301, a function information acquisition unit 302, a function information holding unit 303, a priority change necessity determination unit 304, and a cell selection control unit 305 as its functional configuration.
- FIG. 3 shows only the functions particularly related to the present embodiment, and the illustration of various functions that the other terminal device 102 may have is omitted.
- the terminal device 102 naturally has other functions generally possessed by the terminal device in the cellular communication system.
- the functional blocks in FIG. 3 are schematically shown, and each functional block may be integrated or further subdivided.
- each function of FIG. 3 may be realized, for example, by the processor 201 executing a program stored in the ROM 202 or the storage device 204, for example, a processor existing inside the communication circuit 205 is predetermined. It may be realized by running the software.
- the priority information acquisition unit 301 acquires first information indicating the priority when the terminal device 102 selects a cell to connect to with respect to a plurality of frequency bands that can be used in wireless communication.
- the priority information acquisition unit 301 is used when the first priority should be changed in addition to the information indicating the first priority which should be used in normal times (for example, when a predetermined function is not executed).
- Information indicating the second priority may be acquired.
- the priority information acquisition unit 301 may acquire the priority information internally by reading it, or may acquire it from the surrounding base station apparatus 101. For example, the priority information acquisition unit 301 acquires information from the connection-destination base station device and holds it in advance when the connection state is reached immediately before, and the holding information is held in the standby state. Can be read.
- information may be acquired from a base station device different from the base station device 101 constituting the cell to be selected.
- the priority information determined in advance by the telecommunications carrier may be pre-registered in, for example, SIM, and in this case, the information can be acquired without communication.
- the function information acquisition unit 302 receives one or more bases from each of the surrounding one or more base station devices 101 in a predetermined frequency band among a plurality of frequency bands that can be used in the above-mentioned wireless communication. A second piece of information indicating whether each of the station devices 101 can perform a predetermined function is acquired. Further, in the function information acquisition unit 302, each of the one or more base station devices 101 from each of the surrounding one or more base station devices 101 performs a predetermined function in each of the plurality of usable frequency bands. Second information indicating whether it is feasible may be acquired.
- the function information holding unit 303 holds information that allows the terminal device 102 to specify a frequency band in which a predetermined function can be executed among one or more frequency bands that can be used for wireless communication.
- the functional information holding unit 303 can hold information based on, for example, a contract made with a telecommunications carrier of the terminal device 102.
- the predetermined function may include, for example, narrowband communication, Early measurement report, Dual Connectivity (single RAT or multi-RAT), Carrier Aggregation, and the like.
- Information on the ability of executable communication such as the number of layers of MIMO may be treated as information on whether or not a predetermined function can be executed.
- information on executable network slices, application functions, and service functions may be treated as information on whether or not a predetermined function can be executed.
- the priority change necessity determination unit 304 is indicated by the first information based on the above-mentioned second information acquired by the function information acquisition unit 302 and the information held by the function information holding unit 303. Determine whether the priority (first priority described above) should be changed. Since the example of the determination process by the priority change necessity determination unit 304 is as described above, the description is not repeated here.
- the cell selection control unit 305 executes cell selection using the priority set based on the result of the determination by the priority change necessity determination unit 304. For example, when the priority change necessity determination unit 304 determines that the priority should not be changed, the cell selection control unit 305 has the above-mentioned first priority acquired by the priority information acquisition unit 301. Perform cell selection according to. On the other hand, when the priority change necessity determination unit 304 determines that the priority should be changed, the cell selection control unit 305 selects the cell according to the second priority changed from the first priority described above. To execute. As described above, the second priority may be acquired by the priority information acquisition unit 301, and for example, a frequency band in which each of the one or more base station devices 101 can execute a predetermined function. The cell selection control unit 305 or the priority change necessity determination unit 304 may be determined based on the frequency band in which the terminal device 102 can execute a predetermined function and the priority before the change.
- the terminal device 102 acquires first information indicating the priority when the terminal device 102 selects a cell to connect to with respect to a plurality of frequency bands that can be used in wireless communication (S401). It should be noted that this process may be performed as an internal process of the terminal device 102, or may be performed as a process of the terminal device 102 acquiring from the base station device 101 or the like by communication. Further, the terminal device 102 has one or more bases in one or more (for example, all) frequency bands of the plurality of available frequency bands from each of the surrounding one or more base station devices 101. A second piece of information indicating whether each of the station devices 101 can perform a predetermined function is acquired (S402).
- the terminal device 102 is a cell according to a first priority that is not changed from the priority acquired in S401 based on the frequency band in which the own device can execute a predetermined function and the second information acquired in S402. It is determined whether to execute the selection or to execute the cell selection according to the second priority changed from the priority acquired in S401 (S403), and execute the cell selection according to the result of the determination in S403 (S404). ..
- the terminal device 102 selects a cell based on the frequency band in which the surrounding base station device 101 can execute a predetermined function and the frequency band in which the own device can perform a predetermined function.
- the frequency band to be focused on can be appropriately determined with priority, and the cell to be connected can be appropriately selected.
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Abstract
Description
図1に、本実施形態に係る無線通信システムの構成例を示す。本無線通信システムは、基地局装置101と端末装置102とを含んで構成される。なお、図1では、2つの基地局装置101と1つの端末装置102のみが図示されているが、これらの台数はこれに限られない。すなわち、1つ以上の基地局装置101と1つ以上の端末装置102が含まれる無線通信システムに以下の議論が適用可能であり、その台数は特に限定されない。
続いて、上述のような処理を実行する端末装置102のハードウェア構成例について図2を用いて説明する。端末装置102は、一例において、プロセッサ201、ROM202、RAM203、記憶装置204、及び通信回路205を含んで構成される。プロセッサ201は、汎用のCPU(中央演算装置)や、ASIC(特定用途向け集積回路)等の、1つ以上の処理回路を含んで構成されるコンピュータであり、ROM202や記憶装置204に記憶されているプログラムを読み出して実行することにより、端末装置102の全体の処理や、上述の各処理を実行する。ROM202は、端末装置102が実行する処理に関するプログラムや各種パラメータ等の情報を記憶する読み出し専用メモリである。RAM203は、プロセッサ201がプログラムを実行する際のワークスペースとして機能し、また、一時的な情報を記憶するランダムアクセスメモリである。記憶装置204は、例えば着脱可能な外部記憶装置等によって構成される。通信回路205は、例えば、LTEや5Gの無線通信用の回路によって構成される。なお、図2では、1つの通信回路205が図示されているが、端末装置102は、(例えばLTE用、および5G用の)複数の通信回路を有しうる。なお、端末装置102は、使用可能な複数の周波数帯域のそれぞれについて別個の通信回路205を有してもよいし、それらの周波数帯域の少なくとも一部に対して共通の通信回路205を有してもよい。また、端末装置102は、セルラ通信用の通信回路205のみならず、無線LAN等の他の無線通信規格に対応する通信回路205を有してもよい。
続いて、端末装置102が実行する処理の流れについて、図4を用いて概説する。なお、本処理は一例であり、2つ以上の処理の順序が相互に入れ替えられてもよいし、それらの処理が同時に実行されてもよい。また、一部の処理が省略されてもよいし、変形されてもよい。なお、本処理は、例えば、プロセッサ201がROM202や記憶装置204に記憶されているプログラムを実行することにより実現されてもよいし、例えば通信回路205の内部に存在するプロセッサが所定のソフトウェアを実行することによって実現されてもよい。なお、以下では、各処理の内容については上述された通りであるため、詳細については説明を省略し、処理の流れの概要のみを説明する。
Claims (21)
- 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置であって、
複数の周波数帯域に関して接続先のセルを選択する際の優先度を示す第1の情報を取得し、かつ、前記1つ以上の基地局装置のそれぞれから前記複数の周波数帯域のうちの1つの所定の周波数帯域において当該基地局装置が所定の機能を実行可能であるかを示す第2の情報を取得する取得手段と、
前記第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかを決定する決定手段と、
前記決定手段による決定に従って、接続先のセルの選択を実行する実行手段と、
を有する端末装置。 - 前記決定手段は、前記第2の情報が前記所定の機能を実行可能でないことを示し、前記所定の周波数帯域より優先されない他の周波数帯域において前記端末装置が前記所定の機能を実行可能である場合に、前記第2の優先度に従って接続先のセルを選択すると決定する、
請求項1に記載の端末装置。 - 前記決定手段は、前記第2の情報が前記所定の機能を実行可能でないことを示し、前記所定の周波数帯域より優先されないことを前記第1の情報が示す他の周波数帯域において前記端末装置が前記所定の機能を実行可能でない場合に、前記第1の優先度に従って接続先のセルを選択すると決定する、
請求項1又は2に記載の端末装置。 - 前記決定手段は、前記第2の情報が前記所定の機能を実行可能であることを示し、前記所定の周波数帯域において前記端末装置が前記所定の機能を実行可能である場合、
前記所定の周波数帯域より優先されることを前記第1の情報が示す他の周波数帯域において前記端末装置が前記所定の機能を実行可能である場合に、前記第1の優先度に従って接続先のセルを選択すると決定し、
前記所定の周波数帯域より優先されることを前記第1の情報が示す他の周波数帯域において前記端末装置が前記所定の機能を実行可能でない場合に、前記第2の優先度に従って接続先のセルを選択すると決定する、
請求項1から3のいずれか1項に記載の端末装置。 - 前記決定手段は、前記所定の周波数帯域より優先されない他の周波数帯域において前記端末装置が前記所定の機能を実行可能である場合に、前記第2の優先度に従って接続先のセルを選択すると決定する、
請求項1から4のいずれか1項に記載の端末装置。 - 前記決定手段は、前記第2の情報が前記所定の機能を実行可能であることを示し、前記所定の周波数帯域より優先されない他の周波数帯域において前記端末装置が前記所定の機能を実行可能でない場合に、前記第1の優先度に従って接続先のセルを選択すると決定する、
請求項1から5のいずれか1項に記載の端末装置。 - 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置であって、
複数の周波数帯域に関して、接続先のセルを選択する際の優先度を示す第1の情報を取得する取得手段と、
前記複数の周波数帯域のいずれにおいて前記1つ以上の基地局装置が所定の機能を実行可能であるかを示す第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかを決定する決定手段と、
前記決定手段による決定に従って、接続先のセルの選択を実行する実行手段と、
を有する端末装置。 - 前記決定手段は、前記第2の情報により前記所定の機能を実行可能であることが示された第1の周波数帯域が前記第1の情報において優先されないことが示された周波数帯域であり、当該第1の周波数帯域において前記端末装置が前記所定の機能を実行可能であり、前記第1の情報において当該第1の周波数帯域より優先度が高いことが示された第2の周波数帯域において前記所定の機能を実行可能でないことが前記第2の情報により示される場合に、前記第2の優先度に従って接続先のセルを選択すると決定する、
請求項7に記載の端末装置。 - 前記決定手段は、前記第2の情報により前記所定の機能を実行可能であることが示された第1の周波数帯域が前記第1の情報において優先されないことが示された周波数帯域であり、当該第1の周波数帯域において前記端末装置が前記所定の機能を実行可能であり、当該第1の周波数帯域より優先度が高いことが前記第1の情報によって示された第2の周波数帯域において、前記端末装置が前記所定の機能を実行可能でない場合に、前記第2の優先度に従って接続先のセルを選択すると決定する、
請求項7又は8に記載の端末装置。 - 前記決定手段は、前記第2の情報により前記所定の機能を実行可能であることが示された周波数帯域に、前記端末装置が前記所定の機能を実行可能な周波数帯域が含まれない場合に、前記第1の優先度に従って接続先のセルを選択すると決定する、
請求項7から9のいずれか1項に記載の端末装置。 - 前記決定手段は、前記第2の情報により前記所定の機能を実行可能であることが示された周波数帯域がない場合に、前記第1の優先度に従って接続先のセルを選択すると決定する、
請求項7から10のいずれか1項に記載の端末装置。 - 前記所定の機能は、Carrier AggregationまたはDual Connectivityの機能であり、
前記第2の情報は、前記所定の機能を実行可能な周波数帯域の組み合わせを示し、
前記決定手段は、前記第2の情報によって示される周波数帯域の組み合わせにおいて、前記端末装置が前記所定の機能を実行可能であるかに基づいて、前記第1の優先度と前記第2の優先度とのいずれに従って接続先のセルを選択するかを決定する、
請求項7から11のいずれか1項に記載の端末装置。 - 前記所定の機能は、Multi-RAT (Radio Access Technology) Dual Connectivityの機能であり、
前記第2の情報は、前記所定の機能を実行可能な第1のRATの周波数帯域と第2のRATの周波数帯域との組み合わせを示し、
前記決定手段は、前記第2の情報によって示される第1のRATの周波数帯域と第2のRATの周波数帯域との組み合わせにおいて、前記端末装置が前記所定の機能を実行可能であるかに基づいて、前記第1の優先度と前記第2の優先度とのいずれに従って接続先のセルを選択するかを決定する、
請求項7から11のいずれか1項に記載の端末装置。 - 前記所定の機能は、狭帯域通信の機能である、請求項1から11のいずれか1項に記載の端末装置。
- 前記所定の機能は、Early measurement reportの機能である、請求項1から11のいずれか1項に記載の端末装置。
- 前記所定の機能は、S-NSSAI(Single Network Slice Selection Assistance Information)、Slice/Service type (SST)、または、Slice Differentiator (SD)で識別されるネットワークスライスを実現するための機能である、請求項1から11のいずれか1項に記載の端末装置。
- 前記取得手段は、さらに、前記第2の情報を前記1つ以上の基地局装置から取得する、請求項1から16のいずれか1項に記載の端末装置。
- 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置によって実行される制御方法であって、
複数の周波数帯域に関して接続先のセルを選択する際の優先度を示す第1の情報を取得することと、
前記1つ以上の基地局装置のそれぞれから前記複数の周波数帯域のうちの1つの所定の周波数帯域において当該基地局装置が所定の機能を実行可能であるかを示す第2の情報を取得することと、
前記第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかの決定を行うことと、
前記決定に従って、接続先のセルの選択を実行することと、
を有する制御方法。 - 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置によって実行される制御方法であって、
複数の周波数帯域に関して、接続先のセルを選択する際の優先度を示す第1の情報を取得することと、
前記複数の周波数帯域のいずれにおいて前記1つ以上の基地局装置が所定の機能を実行可能であるかを示す第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかの決定を行うことと、
前記決定に従って、接続先のセルの選択を実行することと、
を有する制御方法。 - 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置に備えられたコンピュータに、
複数の周波数帯域に関して接続先のセルを選択する際の優先度を示す第1の情報を取得させ、
前記1つ以上の基地局装置のそれぞれから前記複数の周波数帯域のうちの1つの所定の周波数帯域において当該基地局装置が所定の機能を実行可能であるかを示す第2の情報を取得させ、
前記第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかの決定を行わせ、
前記決定に従って、接続先のセルの選択を実行させる、
ためのプログラム。 - 1つ以上の基地局装置が形成する複数のセルの中から接続対象とするセルの選択を行う端末装置に備えられたコンピュータに、
複数の周波数帯域に関して、接続先のセルを選択する際の優先度を示す第1の情報を取得させ、
前記複数の周波数帯域のいずれにおいて前記1つ以上の基地局装置が所定の機能を実行可能であるかを示す第2の情報と、前記端末装置が使用可能な周波数帯域のうち前記所定の機能を実行可能な周波数帯域とに基づいて、前記第1の情報によって示される優先度から変更されない第1の優先度に従って接続先のセルを選択するか、前記第1の情報によって示される優先度から変更された第2の優先度に従って接続先のセルを選択するかの決定を行わせ、
前記決定に従って、接続先のセルの選択を実行させる、
ためのプログラム。
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US11864105B2 (en) | 2024-01-02 |
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US20230199640A1 (en) | 2023-06-22 |
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