WO2011125697A1 - 移動端末及び移動通信方法 - Google Patents
移動端末及び移動通信方法 Download PDFInfo
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- WO2011125697A1 WO2011125697A1 PCT/JP2011/057948 JP2011057948W WO2011125697A1 WO 2011125697 A1 WO2011125697 A1 WO 2011125697A1 JP 2011057948 W JP2011057948 W JP 2011057948W WO 2011125697 A1 WO2011125697 A1 WO 2011125697A1
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- information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0083—Multi-mode cell search, i.e. where several modes or systems can be used, e.g. backwards compatible, dual mode or flexible systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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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
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a mobile terminal and a mobile communication that use a first cell as a serving cell for standby and communication in an overlapping area between a first cell that can communicate using the first method and a second cell that can communicate using the second method. Regarding the method.
- a cell capable of communicating with the UMTS (Universal Mobile Telecommunications System) method and LTE (Long Term Evolution) capable of downloading a large amount of content at a higher speed than the UMTS method.
- the overlapping area with cells (hereinafter referred to as LTE cells) that can be communicated by the system is also expanding.
- Patent Document 1 In such overlapping areas of UMTS cells and LTE cells, it is known to improve the convenience of the user by appropriately displaying which cell is located on the display screen of the mobile terminal (for example, Patent Document 1).
- the present invention has been made in view of such a point, and a mobile terminal having a UMTS cell as a serving cell does not perform a cell search for an LTE cell in the vicinity of the serving cell within the range of the LTE cell.
- An object of the present invention is to provide a mobile terminal and a mobile communication method capable of displaying a certain thing.
- the mobile terminal waits for and communicates with the first cell in an overlapping area between the first cell that can communicate with the first method and the second cell that can communicate with the second method.
- the receiving unit receives the broadcast information broadcast from the network device of the first method, and the broadcast information received by the reception unit includes the second cell detection identifier
- the mobile terminal is within the range of the second cell when the mobile terminal is estimated to be within the range of the second cell and the estimation unit estimates that the mobile terminal is within the range of the second cell.
- a display unit for displaying the above.
- the mobile terminal that uses the first cell as the serving cell only determines whether or not the received broadcast information includes the second cell detection identifier. It can be displayed. Therefore, it is not necessary to perform a cell search for the second cell just to display that the second cell is within range on the display screen, and it is possible to prevent an increase in processing load and power consumption of the mobile terminal due to the cell search. Can do.
- a priority determination unit that determines priorities of the first cell and the second cell, and the estimation unit are configured to perform the second determination by the priority determination unit over the second cell.
- the mobile terminal is estimated to be within the range of the second cell .
- the mobile terminal having the first cell as the serving cell is in a case where the wireless environment in the first cell that is the serving cell is good and it is not necessary to change the serving cell to the second cell. Even if it exists, it is not necessary to perform a cell search for a second cell having a lower priority than the first cell that is a serving cell, so that the display screen shows whether or not the cell is within the LTE cell range. The processing load and power consumption of the terminal can be reduced.
- the estimation unit is received by the reception unit when the priority determination unit determines that the priority of the second cell is higher than that of the first cell. If the broadcast information includes the second cell detection identifier, it is estimated that the mobile terminal is within the range of the second cell.
- the mobile terminal having the first cell as the serving cell is in a case where the wireless environment in the first cell that is the serving cell is good and it is not necessary to change the serving cell to the second cell. Even if there is, there is no need to perform a cell search for a second cell having a higher priority than the first cell that is a serving cell, in order to indicate whether or not it is within the LTE cell range on the display screen.
- the processing load and power consumption of the terminal can be reduced.
- the receiving unit is capable of receiving individual priority information individually notified to the mobile terminal from the network device of the first scheme in addition to the broadcast information, and the priority
- the degree determining unit determines the priority of the first cell and the second cell according to the individual priority information.
- the mobile terminal even when the individual priority information is individually notified to the mobile terminal from the network side device of the first method, the mobile terminal appropriately determines the priorities of the first cell and the second cell. can do.
- the estimation unit is a case where the priority determination unit determines that the priority of the second cell is lower than the first cell according to the individual priority information, and Even if the second cell detection identifier is included in the individual priority information, if the second cell detection identifier is not included in the broadcast information, the mobile terminal is out of the range of the second cell. Estimated.
- the broadcast information is SIB (System Information Block) 19
- the second cell detection identifier is E-UTRA Detection set to TRUE.
- the mobile communication method in the overlap area between the first cell that can communicate with the first method and the second cell that can communicate with the second method, the mobile communication method waits for and communicates with the first cell.
- a mobile terminal that has a UMTS cell as a serving cell can display that it is within the LTE cell range on the display screen without performing a cell search for LTE cells near the serving cell, and A mobile communication method can be provided.
- FIG. 1 is a configuration diagram of a mobile communication system according to a first embodiment of the present invention. It is a functional block diagram of the mobile terminal which concerns on the 1st Embodiment of this invention. It is a figure which shows the display screen of the mobile terminal which concerns on the 1st Embodiment of this invention. It is a flowchart which shows operation
- FIG. 1 is a diagram showing a schematic configuration of a mobile communication system according to the first embodiment of the present invention.
- the UMTS cell A first cell that can communicate with the UMTS system (first system)
- the LTE cell B second system that can communicate with the LTE system (second system).
- Cell is partially geographically overlapped.
- the UMTS cell A is not limited to a cell that can communicate with the UMTS system, and may be a cell that can communicate with a communication system of a generation before the communication system used in the LTE cell B.
- the LTE cell B is not limited to a cell that can communicate with the LTE system, and is a cell that can communicate with another 3.9th generation communication system or a 4th generation or later communication system such as the LTE-Advanced system. May be.
- the UE 10 that is various mobile terminals such as a mobile phone, a notebook personal computer, and a portable game machine sets the serving cell for standby and communication to either the UMTS cell A or the LTE cell B. It is configured to adaptively change.
- the RNC 30 network side device
- the NB 20 that is a radio controller connected to the NB 20 via the NB (Node B) 20 that is a radio base station that forms the UMTS cell
- RRC Radio Resource Control
- UE10 transmits / receives the control signal of RRC protocol with eNB (eNodeB) 40 which is a radio base station which forms LTE cell B, when LTE cell B is made into a serving cell.
- eNB eNodeB
- the RNC 30 is configured to broadcast common priority information to the UE 10 having the UMTS cell A as the serving cell in the overlapping area of the UMTS cell A and the LTE cell B.
- the common priority information is included in broadcast information commonly broadcast to the UE 10 having the UMTS cell A as the serving cell, and indicates the priority of the UMTS cell A and the LTE cell B.
- SIB System Information Block
- “E-UTRA frequency and priority info list” included in “SIB 19” is used as common priority information. Is used.
- the RNC 30 may be configured to notify dedicated priority (Dedicated Priority) information to the UE 10 having the UMTS cell A as a serving cell in the overlapping area of the UMTS cell A and the LTE cell B.
- the individual priority information is individually notified to the UE 10 having the UMTS cell A as the serving cell, and indicates the priority of the UMTS cell A and the LTE cell B.
- “Dedicated Priority Information” of “UTRAN Mobility Information” is used as the individual priority information.
- the RNC 30 broadcasts broadcast information including the LTE cell detection identifier to the UE 10 having the UMTS cell A as the serving cell in the overlapping area of the UMTS cell A and the LTE cell B.
- the LTE cell detection identifier (second cell detection identifier) is an identifier indicating that the LTE cell B geographically overlaps or is close to the UMTS cell A.
- the LTE cell detection identifier for example, “E-UTRA detection” set to “TRUE” is used.
- E-UTRA detection used as an LTE cell detection identifier is an information element included in both “SIB19” and “UTRAN Mobility Information”. It is estimated whether or not the cell is within the LTE cell range depending on whether or not “E-UTRA detection” in which “TRUE” is set is included.
- the configuration of the UE 10 in the mobile communication system 1 will be described.
- the UE 10 has hardware including a communication interface, a processor, a memory, a display, and input keys, and software modules executed by the processor are stored in the memory.
- a functional configuration of the UE 10 to be described later may be realized by the above-described hardware, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- FIG. 2 is a functional configuration diagram of the UE according to the first embodiment of the present invention.
- the UE 10 includes a radio communication unit 11, a priority determination unit 12, an estimation unit 13, a display unit 14, and an instruction reception unit 15.
- the radio communication unit 11 transmits and receives radio signals to and from the NB 20. Specifically, the radio communication unit 11 (reception unit) receives broadcast information broadcast from the RNC 30 when the UMTS cell A is a serving cell. Further, when the UMTS cell A is the serving cell, the radio communication unit 11 may receive the individual priority information notified individually from the RNC 30 via the NB 20. Note that the wireless communication unit 11 may receive broadcast information notified from a network side device other than the RNC 30 or individual priority information notified from a network side device other than the RNC 30.
- wireless communication part 11 transmits / receives a radio signal with eNB40, when making LTE cell B into a serving cell.
- the priority determination unit 12 determines the priorities of the UMTS cell A and the LTE cell B. Specifically, when the broadcast information including the common priority information is received by the wireless communication unit 11, the priority determination unit 12 determines the priorities of the UMTS cell A and the LTE cell B according to the common priority information. . Further, when the priority determination unit 12 receives the individual priority information in addition to the broadcast information including the common priority information by the wireless communication unit 11, the priority of the UMTS cell A and the LTE cell B according to the individual priority information. Judge the degree.
- the estimation unit 13 determines whether or not the LTE detection identifier is included in the broadcast information received by the wireless communication unit 11 in response to a request from the instruction reception unit 15 described later. To estimate whether the UE 10 is within the LTE cell B. Note that the estimation unit 13 may estimate whether or not the mobile station is within the LTE cell B in response to reception of the broadcast information by the wireless communication unit 11 without a request from the instruction receiving unit 15.
- the estimation unit 13 adds the LTE information to the broadcast information received by the wireless communication unit 11.
- the detection identifier is included, it is estimated that the UE 10 is within the LTE cell B without performing a cell search for the LTE cell B having a lower priority than the UMTS cell A that is the serving cell.
- the estimation unit 13 estimates that the UE 10 is within the LTE cell B.
- the estimation unit 13 determines that the LTE determination identifier 12 is included in the broadcast information received by the wireless communication unit 11 when the priority determination unit 12 determines that the LTE cell B has a lower priority than the UMTS cell A. If not included, the UE 10 is not in the LTE cell B range (ie, out of the range) without performing a cell search for the LTE cell B having a lower priority than the UMTS cell A that is the serving cell. Also good. For example, when the “SIB 19” received by the wireless communication unit 11 includes “E-UTRA detection” set to “FALSE”, or the “SIB 19” includes “E-UTRA detection”.
- the estimation unit 13 estimates that the UE 10 is out of the LTE cell B area when the SIB 19 received by the wireless communication unit 11 does not include the information element itself of “E-UTRA frequency and priority info list”. May be.
- the estimation unit 13 determines that the LTE determination identifier 12 is included in the broadcast information received by the wireless communication unit 11 when the priority determination unit 12 determines that the LTE cell B has a higher priority than the UMTS cell A. If included, the UE 10 may be estimated to be within the LTE cell B without performing a cell search for the LTE cell B having a higher priority than the UMTS cell A that is the serving cell.
- the estimation unit 13 determines that the LTE determination identifier 12 is included in the broadcast information received by the wireless communication unit 11 when the priority determination unit 12 determines that the LTE cell B has a higher priority than the UMTS cell A. If not included, the UE 10 estimates that the cell 10 is not in the LTE cell B range (ie, out of the range) without performing a cell search for the LTE cell B having a higher priority than the UMTS cell A that is the serving cell. Also good.
- FIG. 3 is a diagram illustrating a display screen by the display unit 14 according to the first embodiment.
- the display unit 14 sets the UMTS cell A as a serving cell and the estimation unit 13 estimates that the cell is within the LTE cell B, for example, as shown in FIG. Show that you are in the range.
- the display unit 14 sets the UMTS cell A as a serving cell and the estimation unit 13 estimates that the cell is out of the LTE cell B, for example, as illustrated in FIG. 3B, the LTE cell B For example, as shown in FIG. 3C, it may be displayed that the cell is out of the LTE cell B.
- the display unit 14 when the LTE cell B is a serving cell, or when the serving cell is changed to the LTE cell B by the standby processing unit 16 described later, the display unit 14, for example, as shown in FIG. You may display that UE10 is in the area of LTE cell B.
- the instruction receiving unit 15 receives a display instruction from the user as to whether or not the user is within the LTE cell B. In response to the reception of the display instruction, the instruction receiving unit 15 requests the estimating unit 13 to estimate whether or not the cell is within the LTE cell B.
- FIG. 4 is a flowchart showing the operation of the UE according to the first embodiment of the present invention.
- the radio communication unit 11 of the UE 10 receives the broadcast information broadcast from the RNC 30, and the priority determination unit 12 acquires common priority information included in the received broadcast information (step S101).
- the priority determination unit 12 determines whether or not individual priority information indicating that the LTE cell B has a lower priority than the UMTS cell A is received by the wireless communication unit 11 (step S102).
- the priority determination unit 12 receives the information from the UMTS cell A according to the individual priority information. Also, it is determined that the priority of the LTE cell B is low, and the operation proceeds to step S104.
- the priority determination unit 12 acquires the common priority acquired in step S101. It is determined whether the priority of the LTE cell B is lower than the UMTS cell A according to the degree information (step S103).
- step S103 When the priority determination unit 12 determines that the priority of the LTE cell B is lower than the UMTS cell A according to the common priority information (step S103; Yes), the operation proceeds to step S104. On the other hand, when the priority determination unit 12 determines that the LTE cell B has a higher priority than the UMTS cell A according to the common priority information (step S103; No), this operation ends.
- the estimation unit 13 adds the LTE cell detection identifier to the broadcast information received by the radio communication unit 11. Is included (step S104).
- the estimation unit 13 estimates that the UE 10 is within the LTE cell B, and the instruction reception unit 15 It is determined whether or not a display instruction indicating whether or not the mobile phone is within the LTE cell B range has been received (step S105).
- the display unit 14 is within the range of the LTE cell B, for example, as illustrated in FIG. (Step S106). With this display, the user of the UE 10 can recognize that an application specialized for the LTE system can be used and that large-capacity content can be downloaded.
- step S105 when the display instruction is not received by the instruction receiving unit 15 (step S105; No), the display unit 14 does not perform the display operation, and this operation ends. Note that step S105 can be omitted, and the display unit 14 indicates that the UE 10 is within the LTE cell B according to the estimation result by the estimation unit 13 regardless of whether or not the display instruction is received by the instruction receiving unit 15. It may be displayed.
- the estimation unit 13 estimates that the UE 10 is out of the LTE cell B range, and the instruction reception unit 15 It is determined whether or not a display instruction from the user indicating whether the user is within the LTE cell B is accepted (step S107).
- the display unit 14 When the display instruction is received by the instruction receiving unit 15 (step S107; Yes), the display unit 14 is within the LTE cell B area as illustrated in FIG. 3B, for example, according to the estimation result by the estimation unit 13. This is not displayed, or as shown in FIG. 3C, it is displayed that the UE 10 is out of the range of the LTE cell B (step S108).
- step S107 when the display instruction is not received by the instruction receiving unit 15 (step S107; No), the display unit 14 does not perform the display operation, and this operation ends. Note that step S107 can be omitted, and the display unit 14 indicates that the UE 10 is out of the LTE cell B range according to the estimation result by the estimation unit 13 regardless of whether or not the display instruction is received by the instruction reception unit 15. It may be displayed.
- the estimation unit 13 estimates whether or not the UE 10 is within the LTE cell B depending on whether or not the LTE cell detection identifier is included in the broadcast information, and the display unit 14 estimates by the estimation unit 13 Depending on the result, it can be displayed whether or not it is within the LTE cell B range. Therefore, even when the wireless environment in the UMTS cell A that is the serving cell is good and it is not necessary to change the serving cell to the LTE cell, the display screen indicates whether or not the LTE cell is within the LTE cell range.
- Low priority cell search which is a cell search of the LTE cell B having a lower priority than the UMTS cell A that is the serving cell, and the processing load of the mobile terminal Power consumption can be reduced.
- FIG. 5 is a flowchart showing an operation of the UE according to the first embodiment of the present invention.
- the radio communication unit 11 of the UE 10 receives the broadcast information broadcast from the RNC 30, and the priority determination unit 12 acquires the common priority information included in the received broadcast information (step S201).
- the priority determination unit 12 determines whether or not individual priority information indicating that the LTE cell B has a higher priority than the UMTS cell A is received by the wireless communication unit 11 (step S202).
- the priority determination unit 12 receives the information from the UMTS cell A according to the individual priority information. Also, it is determined that the priority of the LTE cell B is high, and the operation proceeds to step S204.
- the priority determination unit 12 acquires the common priority acquired in step S202. It is determined whether the priority of the LTE cell B is higher than the UMTS cell A according to the degree information (step S203).
- step S203 determines that the LTE cell B has a higher priority than the UMTS cell A according to the common priority information.
- step S203 determines that the priority of the LTE cell B is lower than that of the UMTS cell A according to the common priority information.
- the estimation unit 13 adds the LTE cell detection identifier to the broadcast information received by the radio communication unit 11. Is included (step S204).
- the estimation unit 13 estimates that the UE 10 is within the LTE cell B, and the instruction reception unit 15 It is determined whether or not a display instruction indicating whether or not the mobile phone is within the LTE cell B range is received (step S205).
- the display unit 14 is within the LTE cell B range, for example, as illustrated in FIG. (Step S206). With this display, the user of the UE 10 can recognize that an application specialized for the LTE system can be used and that large-capacity content can be downloaded.
- step S205 when the display instruction is not received by the instruction receiving unit 15 (step S205; No), the display unit 14 does not perform the display operation, and this operation ends. Note that step S205 can be omitted, and the display unit 14 indicates that the UE 10 is within the LTE cell B according to the estimation result by the estimation unit 13 regardless of whether or not the display instruction is received by the instruction receiving unit 15. It may be displayed.
- the estimation unit 13 estimates that the UE 10 is out of the LTE cell B range, and the instruction reception unit 15 It is determined whether or not an instruction to display whether the user is within the LTE cell B is received (step S207).
- the display unit 14 When the display instruction is received by the instruction receiving unit 15 (step S207; Yes), the display unit 14 is within the LTE cell B area, for example, as illustrated in FIG. 3B according to the estimation result by the estimation unit 13. Or display that the UE 10 is out of the range of the LTE cell B (step S208).
- step S207 when the display instruction is not received by the instruction receiving unit 15 (step S207; No), the display unit 14 does not perform the display operation, and this operation ends. Note that step S207 can be omitted, and the display unit 14 indicates that the UE 10 is out of the LTE cell B range according to the estimation result by the estimation unit 13 regardless of whether or not the display instruction is received by the instruction reception unit 15. It may be displayed.
- the estimation unit 13 estimates whether or not the UE 10 is within the LTE cell B depending on whether or not the LTE cell detection identifier is included in the broadcast information, and the display unit 14 estimates by the estimation unit 13 Depending on the result, it can be displayed whether or not it is within the LTE cell B range. Therefore, even when the wireless environment in the UMTS cell A that is the serving cell is good and it is not necessary to change the serving cell to the LTE cell, the display screen indicates whether or not the LTE cell is within the LTE cell range.
- Higher Priority Search which is a cell search of the LTE cell B having a higher priority than the UMTS cell A that is the serving cell, and the processing load of the mobile terminal Power consumption can be reduced.
- FIG. 6 is a diagram for explaining a display control operation according to the common priority information according to the first embodiment of the present invention.
- the UE 10 uses the UMTS cell A as a serving cell.
- the priority determination unit 12 of the UE 10 determines that the LTE cell B has a lower priority than the UMTS cell A according to the common priority information included in the broadcast information from the RNC 30.
- “SIB19” broadcast from the RNC 30 includes “E-UTRA Detection” set to “TRUE”. For this reason, the estimation unit 13 of the UE 10 estimates that the UE 10 is within the LTE cell B without performing a low priority cell search of the LTE cell B having a lower priority than the UMTS cell A that is the serving cell. . In addition, the display unit 14 displays that the UE 10 is within the LTE cell B as shown in FIG. 3A.
- the estimation unit 13 of the UE 10 estimates that the UE 10 is out of the range of the LTE cell B without performing the above-described low priority cell search. Further, the display unit 14 may not display that the UE 10 is within the LTE cell B as shown in FIG. 3B, or the UE 10 is out of the LTE cell B as shown in FIG. 3C. May be displayed.
- “E-UTRA Detection” set to “FALSE” is included in “SIB19” broadcast from RNC 30.
- the estimation unit 13 of the UE 10 estimates that the UE 10 is out of the range of the LTE cell B without performing the above-described low priority cell search.
- the display unit 14 may not display that the UE 10 is within the LTE cell B as shown in FIG. 3B, or the UE 10 is out of the LTE cell B as shown in FIG. 3C. May be displayed. Such a situation occurs when LTE cell B exists but the network operator does not wish to notify the user that it is within range of LTE cell B.
- the above-described display control operation is performed when the priority determination unit 12 of the UE 10 determines that the priority of the LTE cell B is higher than the UMTS cell A according to the common priority information included in the broadcast information from the RNC 30. Also applicable. In such a case, the estimation unit 13 estimates whether or not the UE 10 is within the LTE cell B without performing a high priority cell search for the LTE cell B having a higher priority than the UMTS cell A that is the serving cell. The display unit 14 can display whether or not it is within the LTE cell B.
- FIG. 7 is a diagram for explaining the display control operation according to the individual priority information in the mobile communication system according to the first embodiment of the present invention.
- UE 10 is assumed to have UMTS cell A as a serving cell.
- the radio communication unit 11 of the UE 10 receives notification information notified from the RNC 30 in each of FIGS. 7A to 7D, and receives individual priority information individually notified from the RNC 30 in FIG. 7A. 7A to 7D, it is assumed that the priority determination unit 12 determines that the priority of the LTE cell B is lower than that of the UMTS cell A according to the individual priority information notified in FIG. 7A.
- the broadcast information broadcast from the RNC 30 is set to “SIB19”, the individual priority information individually notified from the RNC 30 is set to “UTRAN Mobility Information”, and the LTE cell detection identifier is set to “TRUE”.
- the description will be given as “E-UTRA Detection”.
- both “UTRAN Mobility Information” and “SIB19” include “E-UTRA Detection” set to “TRUE”.
- the estimation unit 13 of the UE 10 estimates that the UE 10 is within the LTE cell B without performing the above-described low priority cell search.
- the display unit 14 displays that the UE 10 is within the LTE cell B as shown in FIG. 3A.
- UTRAN Mobility Information includes “E-UTRA Detection” set to “TRUE”, but “SIB19” includes the information element itself of “E-UTRA Detection”. I can't. This state occurs because “SIB19” is updated as appropriate according to the wireless environment, network conditions, and the like, whereas “UTRAN Mobility Information” is not updated.
- the estimation unit 13 of the UE 10 does not include the “E-UTRA Detection” information element itself in the “SIB 19”, so that the UE 10 does not perform the above-described low priority cell search and the UE 10 Estimated to be out of range.
- the display unit 14 may not display that the UE 10 is within the LTE cell B as illustrated in FIG. 3B, or the UE 10 may detect that the LTE cell B is within the LTE cell B as illustrated in FIG. 3C. It may be displayed that it is out of range. By such display control, it is possible to prevent the UE 10 from being estimated to remain within the LTE cell B range even though the UE 10 has already moved out of the LTE cell B range.
- UTRAN Mobility Information includes “E-UTRA Detection” set to “TRUE”, and “SIB19” includes “EIBSE” set to “FALSE”. -"UTRA Detection” is included. Such a situation occurs when LTE cell B exists but the network operator does not wish to notify the user that it is within range of LTE cell B.
- the UE 10 since the estimation unit 13 of the UE 10 includes “E-UTRA Detection” set to “FALSE” in “SIB19”, the UE 10 does not perform the above-described low priority cell search and the LTE cell B Estimated to be out of range. Further, as described above, the display unit 14 may not display that the UE 10 is within the LTE cell B as illustrated in FIG. 3B, or the UE 10 may detect that the LTE cell B is within the LTE cell B as illustrated in FIG. 3C. It may be displayed that it is out of range. By such display control, it is possible to prevent the user from being notified that the user is within the LTE cell B, contrary to the desire of the network operator.
- the above-described display control operation is performed when the priority determination unit 12 of the UE 10 determines that the priority of the LTE cell B is higher than that of the UMTS cell A according to the individual priority information included in the broadcast information from the RNC 30. Also applicable.
- the estimation unit 13 can estimate whether or not the UE 10 is within the LTE cell B without performing the above-described high priority cell search, and the display unit 14 is within the LTE cell B. Can be displayed.
- the UE 10 that uses the UMTS cell A as a serving cell determines whether or not the LTE cell B is on the display screen depending on whether or not the LTE cell detection identifier is included in the broadcast information. Can be displayed. Therefore, in order to display on the display screen that the cell is within the range of the LTE cell B, the low priority cell search of the LTE cell B having a lower priority than the cell in the serving cell or the LTE cell having a higher priority than the cell in the serving cell. It is not necessary to perform a high priority cell search for B, and an increase in power consumption due to the cell search can be prevented.
- the UE 10 may receive the UMTS cell A even when the common priority information is notified from the UMTS RNC 30 and the individual priority information is individually notified. And the priority of LTE cell B can be determined appropriately.
- the mobile communication system even when the priorities of the UMTS cell A and the LTE cell B are determined based on the individual priority information individually notified to the UE 10, Whether or not the UE 10 is within the LTE cell B can be estimated based on whether or not the LTE cell detection identifier is included in the broadcast information that is appropriately updated according to the wireless environment, the network status, and the like. Therefore, it is possible to prevent the UE 10 from being estimated to be within the LTE cell B range based on the old individual priority information even though the UE 10 has already moved out of the LTE cell B range.
- the UE 10 when the broadcast information received by the wireless communication unit 11 includes the LTE cell detection identifier, the UE 10 estimates that the terminal is within the LTE cell B, and the LTE cell B The cell search within the LTE cell B is displayed without performing the cell search.
- the UE 10 may perform a cell search of the LTE cell B and then display that the cell is within the LTE cell B according to the cell search result.
- the UE 10 performs a cell search for the LTE cell B in step S106 of FIG. 4, and when the LTE cell B is detected by the cell search, the UE 10 displays that it is within the range of the LTE cell B. Also good.
- the cell search of the LTE cell B is not performed. Therefore, compared to the case where the cell search is performed regardless of whether the LTE detection identifier is included, the UE 10 The processing load and power consumption can be reduced. Further, when the LTE cell B is detected by the cell search, the UE 10 displays that it is within the range of the LTE cell B. Therefore, it is possible to improve the display accuracy of whether or not it is within the range of the LTE cell B.
Abstract
Description
図1は、本発明の第1の実施形態に係る移動通信システムの概略構成を示す図である。図1に示すように、移動通信システム1では、UMTS方式(第1方式)で通信可能なUMTSセルA(第1セル)とLTE方式(第2方式)で通信可能なLTEセルB(第2セル)とが、一部で地理的に重複するように配置されている。UMTSセルAは、UMTS方式で通信可能なセルに限られず、LTEセルBで用いられる通信方式よりも前の世代の通信方式で通信可能なセルであってもよい。また、LTEセルBは、LTE方式で通信可能なセルに限られず、他の第3.9世代の通信方式や、LTE-Advanced方式などの第4世代以降の通信方式で通信可能なセルであってもよい。
次に、移動通信システム1におけるUE10の構成を説明する。なお、UE10は、通信インターフェース、プロセッサ、メモリ、ディスプレイ、入力キーを含むハードウェアを有しており、メモリには、プロセッサによって実行されるソフトウェアモジュールが記憶されている。後述するUE10の機能構成は、上述のハードウェアによって実現されてもよいし、プロセッサによって実行されるソフトウェアモジュールによって実現されてもよいし、両者の組み合わせによって実現されてもよい。
次に、以上のように構成された移動通信システム1の動作について説明する。
第1に、UMTSセルAよりもLTEセルBの優先度が低い場合に、UMTSセルAを在圏セルとするUE10の動作について説明する。図4は、本発明の第1の実施形態に係るUEの動作を示すフローチャートである。
図6は、本発明の第1の実施形態に係る共通優先度情報に従った表示制御動作を説明するための図である。図6において、UE10は、UMTSセルAを在圏セルとしているものとする。また、UE10の優先度判断部12は、RNC30からの報知情報に含まれる共通優先度情報に従って、UMTSセルAよりもLTEセルBの優先度が低いと判断しているものとする。
図7は、本発明の第1の実施形態に係る移動通信システムにおいて個別優先度情報に従った表示制御動作を説明するための図である。図7において、UE10は、UMTSセルAを在圏セルとしているものとする。また、UE10の無線通信部11は、図7A~DのそれぞれでRNC30から報知される報知情報を受信するとともに、図7AでRNC30から個別に通知された個別優先度情報を受信するものとする。また、図7A~Dにおいて、優先度判断部12は、図7Aで通知された個別優先度情報に従って、UMTSセルAよりもLTEセルBの優先度が低いと判断しているものとする。
第1の実施形態に係る移動通信システムによれば、UMTSセルAを在圏セルとするUE10が、報知情報にLTEセル検出識別子が含まれるか否かだけによって、表示画面にLTEセルBの圏内であることを表示させることができる。したがって、表示画面にLTEセルBの圏内であることを表示させるためだけに、在圏セルよりも優先度の低いLTEセルBの低優先度セルサーチや在圏セルよりも優先度の高いLTEセルBの高優先度セルサーチを行う必要がなく、セルサーチによる消費電力の増大を防止することができる。
Claims (7)
- 第1方式で通信可能な第1セルと第2方式で通信可能な第2セルとの重複エリアにおいて、前記第1セルを待ち受け及び通信を行う在圏セルとする移動端末であって、
前記第1方式のネットワーク側装置から報知された報知情報を受信する受信部と、
前記受信部によって受信された報知情報に第2セル検出識別子が含まれる場合、該移動端末が前記第2セルの圏内であると推定する推定部と、
前記推定部によって前記第2セルの圏内であると推定された場合、該移動端末が前記第2セルの圏内であることを表示する表示部と、を具備することを特徴とする移動端末。 - 前記第1セル及び前記第2セルの優先度を判断する優先度判断部と、
前記推定部は、前記優先度判断部によって前記第1セルよりも前記第2セルの優先度が低いと判断された場合で、かつ、前記受信部によって受信された報知情報に第2セル検出識別子が含まれる場合、該移動端末が前記第2セルの圏内であると推定することを特徴とする請求項1に記載の移動端末。 - 前記推定部は、前記優先度判断部によって前記第1セルよりも前記第2セルの優先度が高いと判断された場合で、かつ、前記受信部によって受信された報知情報に第2セル検出識別子が含まれる場合、該移動端末が前記第2セルの圏内であると推定することを特徴とする請求項2に記載の移動端末。
- 前記受信部は、前記報知情報に加えて前記第1方式のネットワーク側装置から該移動端末に個別に通知された個別優先度情報を受信可能であり、
前記優先度判断部は、前記受信部によって前記報知情報に加えて前記個別優先度情報が受信された場合、該個別優先度情報に従って前記第1セル及び前記第2セルの優先度を判断することを特徴とする請求項2又は3に記載の移動端末。 - 前記推定部は、前記優先度判断部によって前記個別優先度情報に従って前記第1セルよりも前記第2セルの優先度が低いと判断された場合で、かつ、該個別優先度情報に前記第2セル検出識別子が含まれる場合であっても、前記報知情報に前記第2セル検出識別子が含まれない場合は、前記移動端末が前記第2セルの圏外であると推定することを特徴とする請求項4に記載の移動端末。
- 前記報知情報は、SIB(System Information Block)19であり、
前記第2セル検出識別子は、TRUEに設定されたE-UTRA Detectionであることを特徴とする請求項1に記載の移動端末。 - 第1方式で通信可能な第1セルと第2方式で通信可能な第2セルとの重複エリアにおいて、前記第1セルを、待ち受け及び通信を行う在圏セルとする移動端末が、前記第1方式のネットワーク側装置から報知された報知情報を受信する工程と、
受信された前記報知情報に第2セル検出識別子が含まれる場合、該移動端末が前記第2セルの圏内であると推定する工程と、
前記第2セルの圏内であると推定された場合、該移動端末が前記第2セルの圏内であることを表示する工程と、を有することを特徴とする移動通信方法。
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