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WO2013111659A1 - Terminal sans fil, procédé de commande et support d'enregistrement - Google Patents

Terminal sans fil, procédé de commande et support d'enregistrement Download PDF

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Publication number
WO2013111659A1
WO2013111659A1 PCT/JP2013/050744 JP2013050744W WO2013111659A1 WO 2013111659 A1 WO2013111659 A1 WO 2013111659A1 JP 2013050744 W JP2013050744 W JP 2013050744W WO 2013111659 A1 WO2013111659 A1 WO 2013111659A1
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WIPO (PCT)
Prior art keywords
cell
wireless terminal
consumption
current
value
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English (en)
Japanese (ja)
Inventor
高志 唯木
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NEC Casio Mobile Communications Ltd
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NEC Casio Mobile Communications Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • 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 wireless terminal, a control method, and a recording medium.
  • the communication state is successively switched according to the connection state with the network (hereinafter, NW) side.
  • NW Network
  • W-CDMA Wideband Code Division Multiple Access
  • Cell-DCH Dedicated CH annel
  • Cell-FACH There are Forward Access CHannel state
  • Cell-PCH Paging CHannel
  • the W-CDMA wireless terminal is generally in idle state when there is no data transmission / reception. This is to reduce the current consumed by the portable wireless terminal. Also, in wireless communication such as LTE (Long Term Evolution) and GSM (registered trademark) / GPRS (Global System for Mobile communications / General Packet Radio Service), as in the idle state of W-CDMA, communication with low current consumption. There is a state.
  • LTE Long Term Evolution
  • GSM Global System for Mobile communications / General Packet Radio Service
  • the wireless terminal periodically performs Paging Channel monitoring such as notification of incoming call, notification of change of broadcast information, notification of ETWS (Earthquake Tsunami Warning System) notification, and monitoring of electric fields of neighboring cells. Perform intermittent reception (DRX).
  • Paging Channel monitoring such as notification of incoming call, notification of change of broadcast information, notification of ETWS (Earthquake Tsunami Warning System) notification, and monitoring of electric fields of neighboring cells.
  • ETWS Earthquake Tsunami Warning System
  • the wireless terminal monitors the electric field of the neighboring cells in the idle state, and when the electric field quality of the cell currently located is deteriorated due to movement or the like, the wireless terminal is located in a cell with a stronger electric field, Perform Cell Reselection to reselect cells.
  • Cell Reselection is defined as a specification of 3rd Generation Partnership Project (3GPP).
  • the wireless terminal determines a cell that satisfies the predetermined condition as a new cell based on the parameter included in the broadcast information notified from the NW and the measurement result of the electric field of the peripheral cell of the wireless terminal.
  • a communication standard of wireless communication access such as W-CDMA and LTE is called RAT (Radio Access Technology). While there are NWs and wireless terminals that support only wireless communication between the same RAT, there are NWs and wireless terminals that support multiple RATs.
  • the NW and the wireless terminal supporting multiple RATs are not limited to Cell Reselection (eg, cell change between W-CDMA cells) in the same RAT, but also Cell Reselection (eg, It is possible to execute the change of W-CDMA cell to LTE cell).
  • the wireless terminal performs Qoffset (offset value of electric field strength) notified by broadcast information from the NW side at the time of executing Cell Reselection from the cell of W-CDMA which is the same RAT to the cell of W-CDMA.
  • Qoffset offset value of electric field strength
  • Each cell is ranked according to parameters (refer to 3GPP TS 25. 304) such as (hysteresis value), HCS_PRIO (hierarchized cell priority level), and cells are selected based on the ranked result.
  • a serving cell ie, a serving cell, in Cell Reselection
  • the following determination formula is used.
  • Rs is a determination value of a Serving Cell, that is, a cell currently located
  • Rn is a determination value of a Neighboring Cell, that is, a cell adjacent to the currently located cell.
  • Qmeas is the measured electric field value of the cell.
  • Qmeas, s is the electric field value of the present cell
  • Qmeas, n is the electric field value of the adjacent cell.
  • Qhysts is a hysteresis value
  • Qoffsets, n is an offset value between cells.
  • the wireless terminal compares the determination value of each cell obtained from the above determination formula, and the determination value of the adjacent cell exceeds the determination value of the current cell for a predetermined time (Rn> Rs), When the predetermined time has elapsed, it is determined that the electric field strength of the Neighboring Cell is stronger than the electric field strength of the Serving Cell. Then, the wireless terminal changes the current location to the relevant cell.
  • a parameter such as HCS_PRIO (hierarchized cell priority level) may be used in order to consider the priority for each cell.
  • a parameter is set as a determination formula that makes it easier to execute Cell Reselection from the W-CDMA cell to the LTE cell that is a high throughput environment. be able to.
  • parameters that facilitate Cell Reselection from the LTE cell are determined by the parameters of the standard specification defined in 3GPP and the parameters included in the broadcast information notified from the NW side (in the case of LTE, refer to 3GPP TS 36.304). As described above, Cell Reselection largely depends on the operation policy on the NW side.
  • the current consumption of the wireless terminal is different for each RAT due to the difference in communication scheme. Furthermore, even in the same RAT, the consumption current of the idle state fluctuates largely depending on the conditions under which the wireless terminal operates (hereinafter, terminal operating conditions). For example, in LTE, the frequency bandwidth to be used, DRX length which is the period of intermittent operation, the number of antennas to be used, etc. become parameters indicating the terminal operating condition. The current consumption of the wireless terminal differs greatly depending on the combination of these.
  • the number of antennas may be switched inside the terminal according to the environment such as the number of neighboring cells to be measured or the reception electric field, for example, in a wireless terminal adopting MIMO (Multiple Input Multiple Output).
  • MIMO Multiple Input Multiple Output
  • Parameters of terminal operation conditions of W-CDMA include DRX length, the number of neighboring cells to be measured, and the number of antennas to be used. In addition, since the frequency bandwidth to be used is fixed in W-CDMA, the frequency bandwidth is not included in the parameters. Further, the parameters of GSM (registered trademark) / GPRS include a Paging cycle, the number of neighboring cells to be measured, and a decode cycle of BCCH / BCH (Broadcast Control Channel / Synchronization Channel) of each cell. The Paging cycle corresponds to the DRX length of W-CDMA.
  • the consumption current differs depending on the combination of parameters indicating the terminal operating conditions as described above.
  • terminal operating conditions such as a narrow frequency bandwidth, a long DRX length, and a small number of antennas consume less current.
  • the parameters indicating the terminal operating conditions are different for each communication method of LTE, W-CDMA and GSM (registered trademark) / GPRS, but in any communication method, patterns of current consumption exist for the number of combined parameters .
  • RRC Radio Resource Control
  • the current consumption of the wireless terminal differs depending on the terminal operating conditions, and the power consumption also differs accordingly.
  • wireless terminals since wireless terminals often operate by battery operation, it is required to operate to suppress power consumption.
  • a cell to be a new access point is determined according to the operation policy of the NW, and terminal operation conditions of each wireless terminal are not considered.
  • the present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a wireless terminal, a control method and a recording medium which can further optimize the power consumption state.
  • a wireless terminal that performs cellular wireless communication, and A communication control unit that performs cell reselection to select an appropriate cell found under a predetermined condition while the wireless terminal is in a cell, and controls the wireless terminal to stay in the appropriate cell; A data storage unit that associates and stores a condition under which the wireless terminal operates and a current consumption value indicating the current consumed by the wireless terminal; After the communication control unit performs the cell reselection and controls the wireless terminal such that the wireless terminal is located in the appropriate cell, the wireless terminal is a cell that was present before the cell reselection was performed.
  • the current consumption value corresponding to the condition in which the wireless terminal operates in the cell before cell reselection is the first current consumption value
  • the current consumption value corresponding to the condition in which the wireless terminal operates in the appropriate cell is the second A determination unit that determines, from the data storage unit, a current consumption value of the second current consumption value, and determines whether the second current consumption value is smaller than the first current consumption value; Equipped with When the determination unit determines that the second consumption current value is smaller than the first consumption current value, the communication control unit is as it is in the appropriate cell, and the second consumption current value If it is determined that the current consumption value is not smaller than the first consumption current value, the wireless terminal is controlled to re-visit the cell before the cell reselection, It is characterized by
  • control method is A control method of a wireless terminal performing wireless communication in a cellular system, comprising: A communication control step of performing cell reselection to select an appropriate cell found under a predetermined condition while the radio terminal is in a cell, and controlling the radio terminal to be in the appropriate cell; , In the communication control step, after the cell reselection is performed and the wireless terminal is controlled to be located in the appropriate cell, the wireless stored in association with each of the conditions under which the wireless terminal operates.
  • the consumption current value indicating the current consumed by the terminal is associated with the condition under which the radio terminal operates in the cell before cell reselection which is the cell in which the radio terminal was located before the cell reselection.
  • a computer readable recording medium is In a wireless terminal performing wireless communication in a cellular system, A communication control function of performing cell reselection to select an appropriate cell found based on a predetermined condition while the wireless terminal is in a cell, and controlling to locate the appropriate cell; A data storage function that stores the condition under which the wireless terminal operates and the current consumption value indicating the current consumed by the wireless terminal in association with each other; After the cell reselection is performed by the communication control function and the radio terminal is controlled to be located in the appropriate cell, the cell in which the radio terminal was located before the cell reselection is performed A consumption current value corresponding to a condition for the wireless terminal to operate in a cell before a certain cell reselection is a first consumption current value, and a consumption current value corresponding to the condition for the wireless terminal to operate in the appropriate cell is A determination function of determining the consumption current value stored in the data storage function as the consumption current value of 2, and determining whether the second consumption current value is smaller
  • FIG. 1 It is a block diagram showing a schematic structure of a portable radio terminal concerning an embodiment. It is a figure which shows an example of the consumption current table stored in the data storage part of FIG. It is a flowchart which shows operation
  • the mobile radio terminal 100 has a function of executing Cell Reselection defined as a specification of 3GPP.
  • the mobile wireless terminal 100 includes a wireless unit 101, a communication control unit 102, and a control unit 103.
  • the wireless unit 101 performs wireless communication with a mobile communication network 200 (hereinafter referred to as NW 200) in which a plurality of base station cells (hereinafter referred to as cells) are formed. Under the control of the communication control unit 102, the wireless unit 101 is located in at least one of the plurality of cells, and performs wireless communication with the NW 200 via the base station of the located cell.
  • the wireless unit 101 supports multiple RATs such as W-CDMA, LTE, and GSM (registered trademark) / GPRS.
  • the wireless unit 101 receives, for example, broadcast information notified from the NW 200 at the time of executing Cell Reselection.
  • the communication control unit 102 controls overall wireless communication via the wireless unit 101. This control includes the control of Cell Reselection defined as the 3GPP specification. Specifically, the communication control unit 102 changes the service area of the mobile terminal 100 to a cell selected as a new service area by Cell Reselection (hereinafter, referred to as a new serving cell). Further, the communication control unit 102 changes the service area destination of the portable terminal 100 based on the determination result of the determination unit 105 described later. Specifically, when the communication control unit 102 determines that the new serving cell is not optimal as the destination, the communication control unit 102 locates the location where the mobile terminal 100 is located before performing Cell Reselection. Change to the serving cell (hereinafter referred to as serving cell before cell reselection).
  • serving cell before cell reselection Change to the serving cell
  • the communication control unit 102 notifies each unit of the portable wireless terminal 100 of various information and the like acquired via the wireless unit 101.
  • the communication control unit 102 notifies the data processing unit 106 of broadcast information and the like from the NW 200.
  • the communication control unit 102 has a memory in which a program for the computer to realize the function of the communication control unit 102 is stored.
  • the function of the communication control unit 102 is realized by the CPU of the computer executing the program stored in the memory.
  • the control unit 103 controls the entire mobile wireless terminal 100.
  • the control unit 103 includes a data storage unit 104, a determination unit 105, and a data processing unit 106.
  • the control unit 103 has a memory in which a program that causes a computer to realize the function of the control unit 103 is stored.
  • the function of the control unit 103 is realized by the CPU of the computer executing the program stored in the memory.
  • the computer that implements the function of the communication control unit 102 and the computer that implements the function of the control unit 103 may be the same computer or separate computers.
  • Data storage unit 104 stores a current consumption value indicating the current consumed by portable wireless terminal 100 according to the terminal operation condition.
  • the data storage unit 104 holds parameters indicating terminal operating conditions and current consumption values, for example, in the current consumption table shown in FIG.
  • the number of antennas, frequency bandwidth, and DRXlength which is a cycle of intermittent operation are stored as terminal operation conditions.
  • one or two antennas are set.
  • the frequency bandwidth 1.4, 3, 5, 10, 15, and 20 MHz are set.
  • 320, 640, 1280, and 2560 ms are set as DRX length.
  • the current consumption value is set for each combination of these parameters.
  • three types of parameters, the number of antennas, the frequency bandwidth, and the DRX length, are used.
  • parameters indicating terminal operating conditions are not limited to these.
  • the types of parameters may be more or less than the example shown in FIG.
  • parameters indicating terminal operating conditions for example, type of RAT, Sintrasearch (Sintersearch, Ssearchrat), whether or not there is an environment with neighboring cell search, and an environment with a neighboring cell search There is the number of cells, etc.
  • the data processing unit 106 decodes broadcast information and internal information (number of antennas etc.) notified from the communication control unit 102, extracts information necessary for specifying a terminal operation condition, and determines the extracted information as the determination unit 105. To notify.
  • the broadcast information is broadcast information (hereinafter, referred to as broadcast information of a new serving cell) acquired from the NW 200 by the communication control unit 102 when the service area is located in a new serving cell.
  • the determination unit 105 specifies a terminal operation condition in the serving cell before cell reselection based on various information on the serving cell before cell reselection.
  • the various information on the serving cell before cell reselection is information such as the number of antennas, RAT, cell ID and the like. These pieces of information are included, for example, in the information notified from the data processing unit 106 at the time of the previous Cell Reselection.
  • determination section 105 is a terminal in the new serving cell based on decoded broadcast information etc. notified from data processing section 106. Identify operating conditions.
  • the notification information notified from the data processing unit 106 is held.
  • the determination unit 105 uses the held information as information on a serving cell before cell reselection in the next execution of Cell Reselection.
  • the determination unit 105 determines the consumption current value corresponding to the terminal operation condition in the serving cell before cell reselection (hereinafter referred to as the consumption current value in the serving cell before cell reselection) and the terminal operation in the new serving cell.
  • the current consumption value corresponding to the condition (hereinafter referred to as the current consumption value in the new serving cell) is obtained from the data storage unit 104. Then, the determination unit 105 compares these current consumption values. If the consumed current value in the new serving cell is smaller than the consumed current value in the serving cell before cell reselection, the determination unit 105 determines that serving in the new serving cell is optimal.
  • the determination unit 105 determines that locating in the new serving cell is not optimal. The determination unit 105 notifies the communication control unit 102 of the determination result.
  • FIG. 3 shows an outline of a flow of processing in which the mobile radio terminal 100 according to the present embodiment selects an optimal cell when executing Cell Reselection.
  • the mobile radio terminal 100 monitors neighboring cells in the idle state, and does not start a series of processing described later until finding neighboring cells satisfying the condition of Cell Reselection (step S1; No).
  • mobile radio terminal 100 When mobile radio terminal 100 finds a neighboring cell that satisfies the condition (step S1; Yes), it specifies a terminal operation condition in the serving cell before cell reselection (step S2). In addition, the mobile radio terminal 100 changes the located area to the neighboring cell that satisfies the condition of Cell Reselection.
  • the mobile wireless terminal 100 acquires broadcast information of a new serving cell from the NW 200 (step S3).
  • the mobile radio terminal 100 specifies a terminal operation condition in a new serving cell based on the acquired broadcast information (step S4).
  • the portable radio terminal 100 refers to the consumption current table of the data storage unit 104, and identifies in step S4 the consumption current value corresponding to the terminal operation condition in the serving cell before cell reselection identified in step S2.
  • the current consumption value corresponding to the terminal operating condition in the new serving cell is acquired (step S5).
  • the mobile wireless terminal 100 compares the current consumption value in the serving cell before cell reselection acquired in step S5 with the current consumption value in the new serving cell (step S6).
  • the mobile radio terminal 100 determines whether or not the new serving cell selected in the current Cell Reselection is optimal based on the result of comparing the current consumption values (step S7).
  • step S7 determines that the new serving cell selected in the current Cell Reselection is optimal (step S7; Yes)
  • Step S7 when the mobile radio terminal 100 determines that the new serving cell selected by the current Cell Reselection is not optimal (Step S7; No), the mobile radio terminal 100 changes the located area to the serving cell before cell reselection (Step S9).
  • step S10 the portable radio terminal 100 suppresses Cell Reselection to the new serving cell again for a predetermined time. That is, the new serving cell is temporarily not selected by Cell Reselection. After execution of step S10, the portable radio terminal 100 returns to step S1.
  • the mobile wireless terminal 100 repeats the series of operations from step S1 to step S10 described above.
  • FIG. 4 shows an example of the operation flow of the communication control unit 102.
  • FIG. 5 shows an example of the operation flow of the determination unit 105.
  • FIG. 6 shows an example of the operation flow of the data processing unit 106.
  • the communication control unit 102 periodically performs, for example, monitoring of neighboring cells until a cell satisfying the condition of Cell Reselection is found (step S11; No).
  • the communication control unit 102 executes cell reselection (hereinafter referred to as “Cell Reselection trigger”), or the serving cell before reselection to the currently located cell.
  • Cell Reselection trigger cell reselection
  • the hardware information such as the reception electric field and the number of used antennas is notified to the determination unit 105 (step S12).
  • the determination unit 105 is waiting for notification of a Cell Reselection trigger from the communication control unit 102 (step S31; No).
  • the determination unit 105 is notified of the Cell Reselection opportunity from the communication control unit 102 (step S31; Yes)
  • the cell reselection is performed based on the simultaneously notified hardware information, the RAT already held, the cell ID, and the like.
  • the terminal operating condition in the serving cell before selection is specified (step S32).
  • the determination unit 105 waits for notification of information on a new serving cell (step S33; No).
  • the communication control unit 102 executes Cell Reselection, and changes the cell in the serving area to a new serving cell (step S13). Subsequently, the communication control unit 102 waits until broadcast information of a new serving cell can be acquired from the NW 200 (step S14; No).
  • the communication control unit 102 If the communication control unit 102 acquires the broadcast information (step S14; Yes), the communication control unit 102 notifies the determination unit 105 of hardware information such as the reception electric field of the new serving cell currently located and the number of antennas used (step S15). Furthermore, notification information of a new serving cell acquired from the NW 200 is notified to the data processing unit 106 (step S16). After that, the communication control unit 102 temporarily suspends the subsequent processing until the determination unit 105 is notified of the determination result as to whether or not the new serving cell selected by the current Cell Reselection is optimal, and the communication control unit 102 It waits for notification of the determination result (step S17; No).
  • the data processing unit 106 waits until notification information is notified from the communication control unit 102 (step S51; No).
  • the data processing unit 106 decodes the notification information notified (step S52), and extracts information necessary for specifying the terminal operation condition (step S53).
  • the information necessary for specifying the terminal operation condition includes, for example, DRX length, the number of neighboring cells to be monitored, Sintrasearch (Sintersearch, Sseachrat), frequency bandwidth (LTE only), and the like.
  • step S54 the data processing unit 106 notifies the determination unit 105 of information necessary for specifying the extracted terminal operation condition. After step S54, the data processing unit 106 returns to step S51.
  • the determination unit 105 is notified when various information for specifying the terminal operating condition of the new serving cell is notified from the communication control unit 102 and the data processing unit 106 (step S33; Yes).
  • the terminal operation condition in the new serving cell is specified based on the various information (step S34). That is, here, values of various parameters indicating terminal operating conditions in the new serving cell are acquired.
  • the determination unit 105 refers to the data storage unit 104 to determine the consumption current value corresponding to the terminal operation condition in the serving cell before cell reselection identified in step S32, and the terminal operation in the new serving cell identified in step S34.
  • the current consumption value corresponding to the condition is acquired (step S35).
  • the determination unit 105 compares the current consumption values acquired in step S35 (step S36). Specifically, the determination unit 105 determines whether the current consumption value in the new serving cell is smaller than the current consumption value in the serving cell before cell reselection. Subsequently, based on the comparison result, the determination unit 105 determines whether the new serving cell selected by the current Cell Reselection is optimal (step S37). Here, when the consumed current value in the new serving cell is smaller than the consumed current value before cell reselection, the determination unit 105 determines that the new serving cell is optimal as a serving location.
  • the determination unit 105 performs comparison and determination using the following determination formula.
  • I_a is a consumption current value in the serving cell before cell reselection.
  • I_b is a current consumption value in a new serving cell.
  • C is a correction value. I_a> I_b + C (1) If the current consumption value acquired in step S35 satisfies the above equation (1), the determination unit 105 determines that the new serving cell selected by the current cell reselection is optimal.
  • the correction value C is a value that changes according to the relationship between the serving cell before cell reselection and the new serving cell, and can take either a positive or negative value.
  • the value of C may be changed according to the relationship between the received electric field of the serving cell before cell reselection and the received electric field of the new serving cell.
  • C> 0 may be set from W-CDMA cell to LTE cell, C ⁇ 0 from LTE cell to W-CDMA cell, or the like. In this way, it may be possible to keep on staying in the RAT where the current consumption can be further reduced.
  • the communication control unit 102 changes the location destination. It notifies that it is unnecessary (step S38). Further, the determination unit 105 holds various information used to specify the terminal operation condition in the serving cell before cell reselection in step S32 (step S39).
  • step S17 when the communication control unit 102 receives a notification from the determination unit 105 (step S17; Yes), and when it is notified that the change of the service area destination is unnecessary (step S18; No) Resume the process, complete the process of determining whether the new serving cell is appropriate, and return to step 11.
  • step S36 determines that the new serving cell selected by the current Cell Reselection is not optimal as a result of the comparison of the consumption current values (step S36) (step S37; No) And notifies the communication control unit 102 to change the serving cell to the serving cell before cell reselection (step S40). Further, the determination unit 105 holds various information used to specify the terminal operation condition in the new serving cell in step S34 (step S41).
  • step S17 when the communication control unit 102 receives a notification from the determination unit 105 (step S17; Yes) and the notification from the determination unit 105 is a change to a serving cell before cell reselection (step S18). Yes) Change the service area destination to the serving cell before cell reselection (step S19).
  • the communication control unit 102 performs control so as not to temporarily exist in the new serving cell (step S20). Specifically, in the subsequent measurement of neighboring cells, weighting is performed such that it is difficult to exclude the new serving cell from the measurement target for a predetermined time or to locate the new serving cell. There are various methods for suppressing Cell Reselection for a specific cell. For example, the cell may not be targeted for monitoring. In addition, weighting may be performed on parameters used for determination of 3GPP-specified Cell Reselection, so that Cell Reselection may not be easily performed. Thereafter, the communication control unit 102 completes the process of determining whether the new serving cell according to the present embodiment is appropriate, and returns to step 11.
  • the consumption current values of the serving cell before cell reselection and the new serving cell are compared, and based on the comparison result, the power consumption state is the optimum cell. Since it will be located, power consumption can be further optimized.
  • the type of RAT can be stored as a parameter indicating the terminal operation condition.
  • the terminal operating conditions are specified by parameters including the type of RAT, and the current consumption value is acquired. Therefore, in Cell Reselection between different RATs, it is possible to locate a cell of a RAT with a lower current consumption value. Thereby, a high power saving effect adapted to the current situation of each mobile wireless terminal 100 can be expected.
  • the new serving cell after the execution of Cell Relsection is optimal using the parameters included in the broadcast information. For example, the frequency bandwidth, DRX length, Sintraserach, Sintersearch, Ssearchrat, the number of neighboring cells, and the like. These are parameters that greatly affect the current consumption. Therefore, it is possible to realize optimization of cell reselection in terms of current consumption also for Cell Relsection in the same RAT.
  • the present invention can be applied to a communication state in which Cell Reselection exists, as in the idle state, such as the Cell-PCH state and the Cell-FACH state of W-CDMA.
  • the existing destination becomes out of range.
  • the communication control unit 102 may trigger the cell reselection, the received electric field of the current cell, or the antenna used.
  • the hardware information such as the number may not be notified to the determination unit 105. Therefore, the determination unit 105 does not determine the current consumption of the serving cell before cell reselection and the new serving cell. In this way, the destination can be prevented from going out of range.
  • the wireless terminal according to the present invention may be configured by installing a program for executing the processing in the above-described embodiment in the wireless terminal.
  • a program for causing a computer capable of wireless communication to execute the above-described operation may be a flexible disk, a compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a magneto-optical disc (MO), or the like.
  • a wireless terminal that executes the above-described processing may be configured by storing and distributing the program in a computer readable recording medium and installing the program in the computer.
  • a method for providing a program to a computer capable of wireless communication is arbitrary.
  • the program may be stored in a disk device or the like included in a predetermined server device on a communication network such as the Internet, and may be distributed to a computer capable of wireless communication via a communication line.
  • the program may be transmitted as a modulated wave in which a carrier wave is modulated by a signal representing the program, and a computer capable of wireless communication that has received the modulated wave may demodulate the modulated wave to restore the program.
  • the computer capable of wireless communication starts this program and executes it under the control of the OS in the same manner as other applications.
  • the computer capable of wireless communication functions as a wireless terminal that executes the above-described processing.
  • the OS Oleting System
  • the OS and an application cooperate to realize it, etc.
  • only the part other than the OS is stored and distributed in the recording medium. Or may be distributed via a communication line.
  • a wireless terminal that performs cellular wireless communication, and A communication control unit that performs cell reselection to select an appropriate cell found under a predetermined condition while the wireless terminal is in a cell, and controls the wireless terminal to stay in the appropriate cell;
  • a data storage unit that associates and stores a condition under which the wireless terminal operates and a current consumption value indicating the current consumed by the wireless terminal; After the communication control unit performs the cell reselection and controls the wireless terminal such that the wireless terminal is located in the appropriate cell, the wireless terminal is a cell that was present before the cell reselection was performed.
  • the current consumption value corresponding to the condition in which the wireless terminal operates in the cell before cell reselection is the first current consumption value
  • the current consumption value corresponding to the condition in which the wireless terminal operates in the appropriate cell is the second
  • a determination unit that determines, from the data storage unit, a current consumption value of the second current consumption value, and determines whether the second current consumption value is smaller than the first current consumption value; Equipped with When the determination unit determines that the second consumption current value is smaller than the first consumption current value, the communication control unit is as it is in the appropriate cell, and the second consumption current value If it is determined that the current consumption value is not smaller than the first consumption current value, the wireless terminal is controlled to re-visit the cell before the cell reselection,
  • a wireless terminal characterized by
  • the communication control unit controls the appropriate cell not to be selected in cell reselection for a predetermined time when the radio terminal is controlled to revisit the cell before the cell reselection after the cell reselection.
  • the wireless terminal according to appendix 1 characterized in that
  • the communication control unit further acquires broadcast information from a network while the wireless terminal is in a cell.
  • the determination unit specifies a condition under which the wireless terminal operates in the cell before cell reselection, based on the broadcast information acquired while the wireless terminal is in the cell before the cell reselection.
  • After the communication control unit performs the cell reselection and controls the wireless terminal to locate the appropriate cell, based on the broadcast information acquired by the wireless terminal in the appropriate cell. And identifying the conditions under which the wireless terminal operates in the appropriate cell, and holding the broadcast information acquired by the wireless terminal while the area is in the appropriate cell.
  • the wireless terminal according to appendix 1 or 2, characterized in that
  • the information processing apparatus further comprises a data processing unit that decodes the broadcast information, extracts information necessary for specifying a condition under which the wireless terminal operates, and notifies the determination unit of the information.
  • the communication control unit controls the wireless terminal to be in the appropriate cell, and then notifies the data processing unit of the broadcast information acquired while the wireless terminal is in the appropriate cell.
  • Appendix 3 The wireless terminal according to appendix 3.
  • the determination unit performs the cell reselection by the communication control unit, and places the wireless terminal in such a manner as to locate the appropriate cell. After control, it is not determined whether the second current consumption value is larger than the first current consumption value.
  • the wireless terminal according to any one of appendices 1 to 4, characterized in that:
  • the cells targeted for the cell reselection include cells of a plurality of different RATs,
  • a control method of a wireless terminal performing wireless communication in a cellular system comprising: A communication control step of performing cell reselection to select an appropriate cell found under a predetermined condition while the radio terminal is in a cell, and controlling the radio terminal to be in the appropriate cell; , In the communication control step, after the cell reselection is performed and the wireless terminal is controlled to be located in the appropriate cell, the wireless stored in association with each of the conditions under which the wireless terminal operates.
  • the consumption current value indicating the current consumed by the terminal is associated with the condition under which the radio terminal operates in the cell before cell reselection which is the cell in which the radio terminal was located before the cell reselection.
  • a data storage function that stores the condition under which the wireless terminal operates and the current consumption value indicating the current consumed by the wireless terminal in association with each other;
  • the cell in which the radio terminal was located before the cell reselection is performed
  • a consumption current value corresponding to a condition for the wireless terminal to operate in a cell before a certain cell reselection is a first consumption current value
  • a consumption current value corresponding to the condition for the wireless terminal to operate in the appropriate cell is A determination function of determining the consumption current value stored in the data storage function as the consumption current value of 2, and determining whether the second consumption current value is smaller than the first consumption current value;
  • the present invention is suitable for optimization of the power consumption state of a portable terminal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2013/050744 2012-01-27 2013-01-17 Terminal sans fil, procédé de commande et support d'enregistrement Ceased WO2013111659A1 (fr)

Applications Claiming Priority (2)

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JP2012014908 2012-01-27
JP2012-014908 2012-06-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003169375A (ja) * 2001-11-30 2003-06-13 Konica Corp 電子機器
JP2003332973A (ja) * 2002-05-15 2003-11-21 Hitachi Ltd 無線通信装置
JP2008011452A (ja) * 2006-06-30 2008-01-17 Matsushita Electric Ind Co Ltd 通信端末装置及び通信方法
JP2011097653A (ja) * 2011-02-14 2011-05-12 Kyocera Corp 無線通信端末

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003169375A (ja) * 2001-11-30 2003-06-13 Konica Corp 電子機器
JP2003332973A (ja) * 2002-05-15 2003-11-21 Hitachi Ltd 無線通信装置
JP2008011452A (ja) * 2006-06-30 2008-01-17 Matsushita Electric Ind Co Ltd 通信端末装置及び通信方法
JP2011097653A (ja) * 2011-02-14 2011-05-12 Kyocera Corp 無線通信端末

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