JP5245789B2 - Mobile communication device and control method of mobile communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique to make it possible to reliably receive paging data with saving power. <P>SOLUTION: A mobile communication device is intended to intermittently perform receiving operations at reception timing of intermittent-receiving cycles synchronized with timing of paging from a base station. The device includes: a measuring means for measuring a reception sensitivity of electrical waves transmitted from the base station; and an intermittent-receiving control means for regarding a time from transmission of paging data by the base station to retransmission of the paging data as a retransmission time if the reception sensitivity measured by the measuring means is greater than a predetermined value, to skip the reception operation in the reception timing at a skip cycle determined based on the retransmission time and the intermittent-reception cycle. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a technique for controlling intermittent reception of paging data.

  A mobile communication device (mobile station) used in a communication system such as UMTS (Universal Mobile Telecommunication System) does not continuously receive control signals from a base station during standby, but intermittently Power saving (battery saving) is achieved by turning on the power and receiving.

  This receiving operation is performed in two stages. As a first stage, the mobile station receives control signals intermittently at a DRX (Discontinuous Receiving) period designated from the network through a PICH (Paging Indicator Channel). The control signal transmitted through the PICH includes a large number of short-term paging indicators (PI) of, for example, 0.25 milliseconds. The paging indicator (PI) is a control signal indicating whether or not a paging signal addressed to one or a plurality of mobile stations is generated.

  Each mobile station determines the presence or absence of a paging signal (incoming call) addressed to itself by monitoring the PI based on its own identifier IMSI (International Mobile Subscriber Identity).

  If there is a paging signal addressed to itself, the mobile station receives the paging signal as the second stage.

  In UMTS, this paging signal (paging data) is transmitted using a PCH (Paging Channel) which is a transport channel mapped on a physical channel SCCPCH (Secondary Common Control Physical Channel). The PCH is received over a relatively long period of time, for example, about 10 milliseconds. The radio frame to which this PCH is mapped is associated with the PI frame of the PICH so as to have a predetermined time difference.

  The received paging signal includes a paging request to the mobile station. In response to this paging request, the mobile station returns a paging response (reception response) to the base station, and then downlink data transmission is started.

The base station described in Patent Literature 1 transmits paging data to a terminal that has received an incoming call, and retransmits the paging data after an intermittent reception period has elapsed if there is no reception response to the paging data. And, in order to further reduce the power consumption of the mobile station, the terminal described in the same document has a period in which the paging data is intermittently received when the transmission path environment is stable, and the transmission path environment is not stable. Change to a longer period. When this terminal changes the intermittent reception cycle to twice that before the change, the intermittent reception operation is skipped for each intermittent reception cycle as compared to before the change.
JP 2005-260906 A

  However, in the terminal described in Patent Literature 1, even if the base station retransmits the paging data, the terminal sometimes cannot receive the paging data.

  For example, the base station described in Patent Document 1 transmits paging data twice at an intermittent reception cycle, but the terminal does not return a reception response to the base station after transmitting the paging data to the base station. In another method, paging data is retransmitted after a retransmission time (for example, after 4 seconds) longer than an intermittent reception cycle (for example, 2.56 seconds) has elapsed.

  In this method, when the terminal described in Patent Document 1 skips the intermittent reception operation for each intermittent reception period, the terminal skips the intermittent reception operation during the period in which the base station retransmits the paging data. The terminal cannot receive the retransmitted paging data intermittently.

  If the intermittent reception operation is not skipped, the terminal can easily receive the paging data, but the power consumption of the terminal cannot be reduced.

  As described above, the configuration described in Patent Document 1 has a problem in that when the power consumption is reduced, the terminal (mobile communication device) may not be able to receive the paging data.

  An object of this invention is to provide the technique which can receive paging data reliably, aiming at power saving.

  In order to achieve the above object, a mobile communication device of the present invention is a mobile communication device that performs a reception operation intermittently at a reception timing of an intermittent reception period synchronized with a paging timing from a base station, Measuring means for measuring reception sensitivity of radio waves transmitted from a base station; and if the reception sensitivity measured by the measuring means is greater than a predetermined value, the base station transmits paging data and then resends the paging data. And intermittent reception control means for skipping the reception operation at the reception timing with a skip period determined based on the retransmission time and the intermittent reception period.

  The mobile communication device control method of the present invention is a control method for a mobile communication device that performs a reception operation intermittently at a reception timing of an intermittent reception period synchronized with a paging timing from a base station, the base station When the reception sensitivity of the radio wave transmitted from the base station is measured and the reception sensitivity is greater than a predetermined value, the retransmission time is defined as the time from when the base station transmits the paging data until the paging data is retransmitted. And the intermittent reception cycle, the mobile communication device control method skips the reception operation at the reception timing with a skip cycle determined based on the intermittent reception cycle.

  According to the present invention, the mobile communication device skips the reception operation in the intermittent reception at a period based on the intermittent reception period and the paging data retransmission time if the reception sensitivity is greater than the predetermined value. However, at the time when the paging data is retransmitted, the mobile communication device is less likely to skip the reception operation. As a result, the mobile communication device can reliably receive the paging data while saving power.

(First embodiment)
A first embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall view showing a configuration of a communication system 1 according to the present embodiment. The communication system 1 includes a base station device 1 and a mobile terminal 2. The communication system 1 uses, for example, a W-CDMA (Wideband Code Division Multiple Access) system compliant with 3GPP (Third Generation Partnership Project) as a communication system.

  The base station apparatus 1 accommodates a plurality of terminals such as the portable terminal 2 and provides a communication service to the accommodated portable terminals.

  In this communication system, intermittent reception is used. The intermittent reception is a technique for activating a signal transmitted from the base station apparatus 1 when it is in a standby mode (idle mode) of the mobile terminal (2) to save power (battery saving).

  The intermittent reception control will be described with reference to FIGS. In the W-CDMA system, as described in “W-CDMA mobile communication system” (supervised by Keiji Tachikawa, Maruzen Co., Ltd., p222-223), the communication system uses Paging to improve battery saving during standby. Performs intermittent reception using Indicator Channel (PICH). The base station apparatus 1 transmits a Paging Indicator (PI) for a short time in order to notify whether there is an incoming call. The waiting portable terminal 2 normally receives the PI only at the transmission timing of this PI, and when the PI is informed that there is an incoming call, the SCCPCH (Secondary Common Control Physical) associated with the PICH Reception of paging data through the PCH mapped on (Channel) is started.

  As shown in FIG. 2A, the intermittent reception period of the frame to which the PI is mapped is specified by the broadcast information from the base station as a DRX Discontinuous Receiving period (for example, 2.56 seconds). In FIG. 2A, a frame painted black is a frame including data to be received by the mobile terminal 2, and a frame painted white is a frame not received by the mobile terminal 2. In each DRX cycle, 2k frames (k is an integer from 6 to 9) are transmitted.

  As shown in FIG. 4B, each frame is composed of a 300-bit signal, of which 288 bits are used as a paging indicator.

  As shown in FIG. 4C, these PIs (288-bit PIs) are grouped into Np groups (Np is 18, 36, 72, or 144), and the mobile terminals that are in standby 2 only needs to receive the PI of the group including its own PI. In FIG. 6C, a group Pq painted black is a group of PIs that the mobile terminal 2 should receive, and a group painted white is a group that the mobile terminal 2 does not need to receive. For example, when Np = 36, 288-bit PIs are divided into 36 groups, and each group is composed of 8 bits. Each group of 8 bits is transmitted in about 0.25 milliseconds. Of these, the portable terminal 2 only needs to receive a group corresponding to its own device.

  Returning to FIG. 1, when the mobile terminal 2 receives an incoming call, the base station apparatus 1 sets the PI corresponding to the mobile terminal 2 to have an incoming call.

  Then, the base station apparatus 1 transmits the paging data to the mobile terminal 2 using PCH (Paging Channel) at a timing corresponding to the DRX cycle after making the PI incoming.

  If the base station apparatus 1 does not receive a reception response to the transmitted paging data from the mobile terminal 2 within a predetermined period, the base station apparatus 1 transmits the incoming PI for the first time until the retransmission time elapses. Set no incoming calls. When the retransmission time has elapsed, the base station apparatus 1 sets the presence of an incoming call in the PI and retransmits the paging data to the mobile terminal 2.

  The mobile terminal 2 is a mobile communication device such as a mobile phone. The mobile terminal 2 includes a reception level monitoring unit 21 and an intermittent reception control unit 23.

  The reception level setting unit 21 measures the reception sensitivity (reception level) of the radio wave transmitted from the base station device 1. The reception level monitoring unit 21 measures, for example, RSCP (Received Signal Code Power) or Ec / No, which is the ratio of RSCP of the most powerful station and total reception power, as the reception level.

  The intermittent reception control unit 23 stores the DRX cycle 231 notified from the base station device 1 in advance. Further, the intermittent reception control unit 23 acquires the paging data retransmission time 235 set in the base station apparatus 1.

  A method for acquiring the retransmission time 235 will be described. The intermittent reception control unit 23 transmits an SMS (Short Message Service) mail 233 to the own device. Then, the base station apparatus 1 accepts the SMS mail 233, transmits a PI indicating that there is an incoming call, and then transmits the first paging data, but the intermittent reception control unit 23 performs the base station on the paging data. No reception response is returned to 1 to the device. The base station apparatus 1 that has not received the reception response transmits the PI with incoming call after the retransmission time has elapsed and retransmits the paging data, but the mobile terminal 2 does not respond to the retransmitted paging data. Then, the portable terminal 2 measures the time from when the first incoming PI is received until the second incoming PI is received, and is stored as a retransmission time.

  Since the portable terminal 2 monitors the PI only in the wakeup period in the DRX cycle, the retransmission time measured by the portable terminal 2 becomes a value close to a multiple of the DRX cycle.

  The intermittent reception control unit 23 calculates a value of a natural number n that satisfies the following expression (1) when the reception level is higher than a predetermined value.

D × (n−1) <T ≦ D × n (1)
In the above equation (1), “D” is the DRX cycle, and T is the retransmission time. If the calculated n is an odd number, the intermittent reception control unit 23 skips the reception operation once every two times. When n is an odd number, T is a value close to an odd multiple of DRX. In this case, if the mobile terminal 2 skips the reception operation once every two times, the probability that the mobile terminal 2 skips the reception operation when the base station apparatus 1 retransmits the paging data is low. Become.

  In the above equation (1), if n is an even number, the intermittent reception control unit 23 skips the reception operation once every three times. When n is an even number, T is a value close to an even multiple of DRX. In this case, if the mobile terminal 2 skips the reception operation once every three times, the probability that the mobile terminal 2 skips the reception operation when the base station apparatus 1 retransmits the paging data is low. Become.

  Here, when n is 6 times, the paging data is transmitted in the cycle skipped by the mobile terminal 2, and then the paging data is retransmitted after the elapse of 6DRX cycles (retransmission cycle), the mobile terminal 2 Indirect reception is skipped, and the portable terminal 2 cannot receive paging data. However, normally, since a retransmission time longer than 10 seconds is not set in the base station apparatus, it is difficult to assume that paging data is retransmitted after 6 DRX cycles (15.36 seconds) or more have elapsed.

  FIG. 3 is a flowchart showing the operation of the base station apparatus 1 of the present embodiment. This operation starts when the base station device 1 registers the mobile terminal (2) to be accommodated. Referring to the figure, base station apparatus 1 determines whether or not an incoming call for a mobile terminal has been accepted (step S1). If there is no incoming call (step S1: NO), the base station apparatus 1 returns to step S1.

  If there is an incoming call (step S1: YES), the base station apparatus 1 sets the presence of the incoming call to the PI corresponding to the mobile terminal and transmits it (step S3).

  When the DRX cycle elapses after PI transmission with an incoming call, the base station apparatus 1 transmits paging data to the mobile terminal that has received the incoming call through PCH (Paging Channel) (step S5). The base station apparatus 1 determines whether or not a reception response to the paging data has been received from the destination mobile terminal within a predetermined period (step S7).

  If the reception response has not been received (step S7: NO), the base station apparatus 1 sets the mobile terminal as having an incoming call when the retransmission time has elapsed since the first PI and paging data were transmitted. The second PI is transmitted (step S9), and the paging data is retransmitted (step S11).

  When the reception response has not been received (step S7: NO) or after step S11, the base station apparatus 1 determines whether or not the registration of the mobile terminal has been canceled (step S13). If the registration has been canceled (step S13: YES), the base station apparatus 1 ends this operation. If the registration is canceled (step S13: NO), the base station apparatus 1 returns to step S1.

  FIG. 4 is a flowchart showing the operation of the mobile terminal 2 of the present embodiment. This operation starts when the mobile terminal 2 is registered in the base station device 1. Referring to FIG. 6, portable terminal 2 determines whether or not it is in a standby state (step T1). If it is not in the standby state (step T1: NO), the portable terminal 2 returns to step S1.

  If it is in a standby state (step T1: YES), the reception level monitoring unit 21 measures Ec / No and RSCP as reception levels (step T3). The intermittent reception control unit 23 executes an intermittent reception control process (step T5).

  The portable terminal 2 determines whether or not the own device has returned from the standby state (step T7). If the mobile terminal 2 returns from the standby state (step T7: YES), the portable terminal 2 ends this operation. If the mobile terminal 2 has not returned from the standby state (step T7: NO), the mobile terminal 2 returns to step T1.

  FIG. 5 is a flowchart showing the intermittent reception control process of the present embodiment. Referring to the figure, the intermittent reception control unit 23 determines whether Ec / No is greater than 15 dB or RSCP is greater than −105 dB (the reception level is greater than a predetermined value) (step T51).

  If the reception level is greater than the predetermined value (step T51: YES), the intermittent reception control unit 23 determines whether or not the intermittent reception skip period has been set (step T53).

  If the intermittent reception skip period is not set (step T53: NO), the intermittent reception control unit 23 executes retransmission time acquisition processing (step T55). The intermittent reception control unit 23 calculates an integer n value that satisfies the above equation (1), and determines whether the integer n is a natural number (step T57).

  If n is a natural number (step T57: YES), the intermittent reception control unit 23 determines whether or not the natural number n is an odd number (step T59).

  If the natural number n is an odd number (step T59: YES), the intermittent reception control unit 23 sets a period twice as long as the DRX period as the intermittent reception skip period (step T61). If the natural number n is an even number (step T59: NO), the intermittent reception control unit 23 sets a period three times the DRX period as the intermittent reception skip period (step T63).

  When the intermittent reception skip cycle has been set (step T53: YED), after step T61 or T63, the intermittent reception control unit 23 intermittently receives a control signal (such as PI) from the base station apparatus 1 in the DRX cycle. Then, the intermittent reception setting process is skipped at the intermittent reception skip period (step T63).

  When the reception level is equal to or lower than the predetermined value (step T51: NO), or when n is not a natural number (step T57: NO), the intermittent reception control unit 23 performs intermittent reception with an intermittent reception cycle (step T67). After step T65 or T67, the intermittent reception control unit 23 ends the intermittent reception control process.

  FIG. 6 is a flowchart illustrating the retransmission time acquisition process. Referring to the figure, the intermittent reception control unit 23 determines whether or not the retransmission time has been acquired (step T551).

  If the retransmission time has not been acquired (step T551: NO), the intermittent reception control unit 23 transmits the SMS mail to the own device (2) (step T553). The intermittent reception control unit 23 determines whether or not the incoming PI is received twice (step T555).

  If the incoming PI is received twice (step T555: YES), the intermittent reception control unit 23 receives the first incoming PI until the second incoming PI is received. Is the retransmission time (step T557).

  If the PI with incoming call has not been received twice (step T555: YES), it is determined whether or not a predetermined set time has elapsed since the reception of the first PI with incoming call (step T559).

  If the set time has not elapsed (step T559: NO), the intermittent reception control unit 23 returns to step T555. If the set time has elapsed (step T559: YES), the intermittent reception control unit 23 sets the retransmission time to 0 seconds (step T561).

  The set time for determining whether or not to set the retransmission time to 0 seconds is at least a value larger than the retransmission time set in the base station apparatus 1. As described above, since the base station apparatus normally sets 0 to 10 seconds as the retransmission time, it is desirable that the setting time be a value larger than 10 seconds. For example, the set time is 5 times the DRX cycle = 12.8 seconds.

  Normally, the paging data is not retransmitted after 6 DRX cycles or longer. However, since there is no standard restriction on the set value of the retransmission time, the base station apparatus may set the retransmission time to 6 DRX or more. it can. When the retransmission time is set to 6 times the DRX cycle, the natural number n satisfying the above equation (1) becomes an even number (6), and the indirect reception control unit 32 skips the indirect reception operation once every three times. In this control method, when the paging data is transmitted in the cycle skipped by the mobile terminal 2 and then the 6DRX cycle (retransmission cycle) has elapsed and the paging data is retransmitted, the mobile terminal 2 skips indirect reception. As a result, the paging data cannot be received. In order to avoid this, in the portable terminal 2, a value less than 6DRX is set as a set time, and when a value greater than that value is measured, the retransmission time is set to 0 seconds.

  If the retransmission time is 0 seconds, the value of the integer n satisfying the above equation (1) is only 0 and not a natural number. Therefore, the mobile terminal 2 can reliably receive the paging data without skipping the reception operation. .

  When the retransmission time is acquired (step T563: NO), after step T557 or T561, the intermittent reception control unit 23 ends the retransmission time acquisition process.

  With reference to Fig.7 (a) and (b), the operation result of the communication system 1 of this embodiment is demonstrated. The same figure (a) and (b) is a figure which shows the intermittent reception operation | movement of the portable terminal 2 of this embodiment. In FIGS. 4A and 4B, the horizontal axis is the time axis. At the time corresponding to the rectangle filled with black, the mobile terminal 2 performs the reception operation by turning on the power of the reception unit (not shown). In other time zones, the mobile terminal 2 turns off the power of the receiving unit and suppresses the power consumption. At the time corresponding to the rectangle filled with white, the mobile terminal 2 skips the reception operation.

  FIG. 7A shows the intermittent reception operation of the mobile terminal 2 when the natural number n satisfying the above equation (1) is an even number (step T57: NO). Referring to the figure, the mobile terminal 2 skips the reception operation at a cycle three times the DRX cycle.

  FIG. 7B shows the intermittent reception operation of the mobile terminal 2 when the natural number n satisfying the above equation (1) is an odd number (step T57: YES). Referring to the figure, the mobile terminal 2 skips the reception operation at a cycle twice the DRX cycle.

  If the mobile terminal 2 performs intermittent reception in this way, the probability that the mobile terminal 2 cannot receive the transmitted paging data is reduced. When the natural number n satisfying the above equation (1) is an even number, the retransmission time is a value close to an even multiple of the DRX cycle. Considering the case where the retransmission time is twice the DRX cycle, even if the paging data is transmitted at the time when the intermittent reception is skipped, the reception operation is skipped after the 2DRX cycle (retransmission time) elapses. Since it is not time, the mobile terminal 2 can receive the retransmitted paging data and complete the incoming call process.

  When the natural number n is an odd number, the retransmission time is a value close to an odd multiple of the DRX cycle. Considering the case where the retransmission time is three times the DRX cycle, even if the paging data is transmitted at the time when the intermittent reception is skipped, the reception operation is skipped after the 3DRX cycle (retransmission time) has elapsed. Since it is not time, the mobile terminal 2 can receive the retransmitted paging data and complete the incoming call process.

  For this reason, in the standby state, the portable terminal 2 can complete the incoming call processing reliably while skipping the reception operation and further reducing power consumption.

  In this embodiment, the intermittent reception control unit 23 transmits the SMS mail in order to measure the retransmission time. However, the intermittent reception control unit 23 can make an inquiry to the line test reception of the telephone number “111”. The portable terminal 2 may transmit i-mode (registered trademark) mail instead of the SMS mail in order to measure the retransmission time. The portable terminal 2 may make a call to its own number or may send an e-mail to the automatic transmission server in order to measure the retransmission time.

  As described above, according to the present embodiment, the mobile terminal 2 (mobile communication device) is based on the DRX cycle (intermittent reception cycle) and the paging data retransmission time if the reception sensitivity is greater than a predetermined value. Since the reception operation in intermittent reception is skipped periodically, the mobile station does not skip the reception operation at the time when the base station apparatus 1 retransmits the paging data. The body communication device can reliably receive the paging data.

  Since the intermittent reception control unit 23 acquires the retransmission time of the paging data by transmitting the SMS mail, the retransmission time can be acquired at an arbitrary time.

  The intermittent reception control unit 23 resends the time from receiving the first incoming PI (first incoming information) to receiving the second incoming PI (second incoming information). Since the time is used, the intermittent reception operation can be optimized in the mobile communication device adopting the W-CDMA system that notifies the presence / absence of an incoming call by PI.

  If the intermittent reception control unit 23 does not receive a second incoming PI within a set period after receiving the first incoming PI, the retransmission time is set to 0 seconds and the reception operation is skipped. Therefore, the mobile terminal 2 can reliably receive the paging data as a result of the indirect reception operation not being skipped when a retransmission time longer than that normally assumed is set. In addition, the mobile terminal 2 can reliably receive the paging data even when it fails to receive the paging data in the retransmission time measurement and the accurate retransmission time cannot be obtained.

  By setting the set time to a value less than 6DRX, when the retransmission time that is an even multiple of DRX that is 6DRX cycles or longer is set in the base station apparatus 1, the mobile terminal 2 performs the intermittent reception operation based on the equation (1). Failure to receive paging data can be prevented.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a block diagram showing the configuration of the mobile terminal 2a of the present embodiment. Referring to the figure, the mobile terminal 2a is the same as the mobile terminal 2 of the first embodiment except that it further includes a reselection control unit 22.

  The reception level monitoring unit 21 of the present embodiment measures the reception levels of the surrounding cells as well as the serving cell in which the mobile terminal 2a is registered.

  The reselection control unit has a reception level of the serving cell that is equal to or lower than a predetermined value, has not performed reselection for a predetermined set time (for example, 5 minutes), and the reception level of the neighboring cell is higher than the reception level of the serving cell. For example, the registration destination of the mobile terminal 2 is changed (reselected) to the base station of the neighboring cell.

  FIG. 9 is a flowchart showing the operation of the mobile terminal 2a of the present embodiment. Referring to the figure, this operation is the same as the operation of the mobile terminal 2 of the first embodiment except that steps T3a and T4 are executed instead of step T3a.

  If the portable terminal 2a is in the standby state (step T1: YES), the reception level monitoring unit 21 measures the reception levels of the serving cell and the surrounding cells (step T3a). And the reselection control part 22 performs a reselection control process (step T4).

  FIG. 10 is a flowchart showing the reselection control process. Referring to the figure, the reselection control unit 22 determines whether Ec / No is greater than 15 dB or RSCP is greater than −105 dB (the reception level is greater than a predetermined value) (step T41).

  If the reception level is equal to or lower than the predetermined value (step T41: NO), the reselection control unit 22 determines whether or not reselection has been performed in the past 5 minutes (step T43).

  If reselection has not been performed in the past 5 minutes (step T43: NO), the reception levels of the serving cell and the peripheral level are compared to determine whether the reception level of the peripheral cell is higher (step T45).

  If the reception level at the peripheral level is higher (step T45: YES), the reselection control unit 22 performs reselection (step T47).

  If the reception level is high (step T41: YES), if reselection has been performed in the past 5 minutes (step T43: YES), if the reception level of the serving cell is higher (step T45: NO), or step T47 Thereafter, the reselection control unit 22 ends the reselection control process.

  As described above, according to the present embodiment, the reselection control unit 22 does not perform reselection for a predetermined set time (for example, 5 minutes) when the reception level of the serving cell is equal to or lower than a predetermined value, If the reception level of the neighboring cell is higher than the reception level of the serving cell, reselection is executed. As a result of the increase in reception level due to reselection, the mobile terminal 2 can reliably receive paging data.

(Third embodiment)
A third embodiment of the present invention will be described with reference to the drawings. The mobile terminal 2 of the present embodiment is different from the mobile terminal 2 of the first embodiment in that the intermittent reception is optimized only in a predetermined time zone.

  FIG. 11 is a flowchart showing the intermittent reception control process of this embodiment. Referring to the figure, the intermittent reception control process of the present embodiment is the same as the intermittent reception control process of the first embodiment except that the intermittent reception control unit 23 further executes step T52.

  If the reception level is greater than the predetermined value (step T51: YES), the intermittent reception control unit 23 determines whether or not the current time is a predetermined time zone (for example, 0:00 am to 6:00 am) ( Step T52).

  If it is a predetermined time zone (step T52: YES), the intermittent reception control unit 23 determines whether or not the intermittent reception skip period has been set (step T53). If it is not the predetermined time zone (step T52: NO), the intermittent reception control unit 23 performs an intermittent reception operation in the DRX cycle (step T65).

  In the present embodiment, the time zone for optimizing the intermittent reception operation is set in advance. However, the user may input the time zone for optimization. For example, when the user sets a predetermined mode such as a sleep mode or a sleep mode, the portable terminal 2 optimizes the intermittent reception operation in the time zone from 0:00 am to 6:00 am.

  The mobile terminal 2 may be configured to optimize the intermittent reception operation when the mobile terminal 2 is being charged or when the mobile terminal 2 is stationary. The mobile terminal 2 determines whether or not it is stationary from the measurement value of the gyro sensor or the like.

  All or part of the flowcharts shown in FIGS. 3 to 5 and 9 to 11 can also be realized by a computer program.

  As described above, according to the present embodiment, since the mobile terminal 2 skips the reception operation in a predetermined time zone, a time zone requiring battery saving can be arbitrarily set, and convenience is improved.

1 is an overall view showing a configuration of a communication system 1 according to a first embodiment of the present invention. (A) It is a figure for demonstrating the intermittent reception operation | movement of this invention. (B) It is a figure for demonstrating the intermittent reception operation | movement of this invention. (C) It is a figure for demonstrating the intermittent reception operation | movement of this invention. It is a flowchart which shows operation | movement of the base station apparatus of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the portable terminal of the 1st Embodiment of this invention. It is a flowchart which shows the intermittent reception control process of the 1st Embodiment of this invention. It is a flowchart which shows the retransmission time acquisition process of the 1st Embodiment of this invention. (A) It is a figure which shows the intermittent reception operation | movement of the portable terminal of the 1st Embodiment of this invention. (B) It is a figure which shows the intermittent reception operation | movement of the portable terminal of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the portable terminal of the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the portable terminal of the 2nd Embodiment of this invention. It is a flowchart which shows the reselection control process of the 2nd Embodiment of this invention. It is a flowchart which shows the intermittent reception control process of the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication system 2, 2a Portable terminal 10 Paging data 21 Reception level monitoring part 22 Reselection control part 23 Intermittent reception control part 231 DRX cycle 233 SMS mail 235 Retransmission time S1-S13, T1-T7, T51-T67, T551-T561 , T3a, T41-T47 steps

Claims (10)

A mobile communication device that intermittently performs a reception operation at a reception timing of an intermittent reception period synchronized with a timing of paging from a base station,
Measuring means for measuring reception sensitivity of radio waves transmitted from the base station;
If the reception sensitivity measured by the measuring means is greater than a predetermined value, the base station transmits the paging data until the paging data is retransmitted , and is an integral multiple of the intermittent reception cycle. Based on a certain retransmission time and the intermittent reception period , the intermittent reception period is D, and the retransmission time is T.
D × (n−1) <T ≦ D × n
If the n satisfying the equation is an even number of natural numbers, twice the intermittent reception cycle is set as a skip cycle, and if the n satisfying the equation is an odd number of natural numbers, the skip is performed three times the intermittent reception cycle. Intermittent reception control means for determining the period and skipping the reception operation at the reception timing in the skip period;
A mobile communication device.   The mobile unit according to claim 1, wherein the intermittent reception control unit measures a retransmission time of paging data transmitted by the base station in response to the transmission by performing a transmission addressed to the mobile communication device itself. Communication equipment. The intermittent reception control means calculates a time from receiving the first incoming information indicating that there is an incoming call from the base station until receiving the second incoming information indicating that there is an incoming call from the base station. The mobile communication device according to claim 1 , wherein the mobile communication device is measured as the retransmission time. The intermittent reception control means does not skip the intermittent reception operation when the second incoming information cannot be received within a predetermined period after receiving the first incoming information from the base station in the incoming from itself. The mobile communication device according to claim 3 . The mobile communication device according to claim 4 , wherein the predetermined period is a period of less than six times the intermittent reception cycle. The measurement means measures the reception level of radio waves transmitted from a serving cell and the reception level of radio waves transmitted from neighboring cells,
The reception level of the serving cell measured by the measurement means is less than or equal to the predetermined value, the period during which reselection is not performed is greater than or equal to a predetermined time, and the reception level of the neighboring cell is higher than the reception level of the serving cell The mobile communication device according to any one of claims 1 to 5 , further comprising reselection means for executing reselection. The mobile communication device according to any one of claims 1 to 6 , wherein the intermittent reception control unit applies a process of skipping the reception operation when a current time is within a predetermined time zone. The mobile communication device according to any one of claims 1 to 7 , wherein the intermittent reception control means applies a process of skipping the reception operation when the mobile communication device is being charged. The mobile communication device according to any one of claims 1 to 8 , wherein the intermittent reception control unit applies a process of skipping the reception operation when the mobile communication device is stationary. A method for controlling a mobile communication device that intermittently performs a reception operation at a reception timing of an intermittent reception period synchronized with a timing of paging from a base station,
Measure the reception sensitivity of radio waves transmitted from the base station,
If the reception sensitivity is greater than a predetermined value , it is a time from when the base station transmits paging data until it retransmits the paging data, and a retransmission time that is an integral multiple of the intermittent reception period and the intermittent reception Based on the period, the intermittent reception period is D, and the retransmission time is T.
D × (n−1) <T ≦ D × n
If the n satisfying the equation is an even number of natural numbers, twice the intermittent reception cycle is set as a skip cycle, and if the n satisfying the equation is an odd number of natural numbers, the skip is performed three times the intermittent reception cycle. A method for controlling a mobile communication device, wherein the method is defined as a cycle, and the reception operation at the reception timing is skipped in the skip cycle.

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