JP2013239769A - Mobile station and state transition timer setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption of a mobile station more efficiently.SOLUTION: A mobile station 1 comprises: a speed acquisition unit 10 for acquiring the travel speed of the mobile station 1; a timer determination unit 11 for determining a state transition timer related to a time necessary to shift the state of the mobile station 1 from a communication state to a power saving state on the basis of the travel speed acquired by the speed acquisition unit 10; and a timer setting unit 12 for setting the state transition timer determined by the timer determination unit 11 to the mobile station 1. The timer determination unit 11 determines that the state transition timer is a time shorter than a prescribed setting time if the travel speed acquired by the speed acquisition unit 10 is faster than a prescribed threshold value. Further, the timer determination unit 11 determines that the state transition timer is a time longer than the prescribed setting time if the travel speed acquired by the speed acquisition unit 10 is slower than the prescribed threshold value.

Description

  The present invention relates to a mobile device and a state transition timer setting method for setting a state transition timer relating to a time until the state of a mobile device is changed from a communication state to a power saving state.

  In Non-Patent Document 1, section 15.6 describes Fast Dormancy, which is a function aimed at reducing the power consumption of mobile devices such as mobile phones.

Harri Holma, Antti Toskala "WCDMA for UMTS: HSPA Evolution and LTE" Wiley Publishing September 22, 2010

  A mobile device to which the Fast Dormancy is applied is determined from the state of the mobile device and the communication state when a timer (Fast Dormancy start timer, hereinafter referred to as “FD start timer”) for a certain period of time has elapsed since the end of data communication. Transition to the idle state (power saving state). FIG. 1 is a diagram illustrating a time series transition of a state and power consumption in a mobile device. In FIG. 1, time T1 indicates the time when data communication in the mobile device is completed, time T2 indicates the time when the FD activation timer expires, and time T between time T1 and time T2 indicates the period of the FD activation timer. Show.

  As shown in FIG. 1A, the mobile device is initially in a communication state, and transitions from the communication state to the idle state at time T2. In addition, as shown in FIG. 1 (b) showing the transition of the power consumption of the mobile device on the same time series as FIG. 1 (a), the power consumption of the mobile device transitioned to the idle state is the mobile device in the communication state. It becomes smaller than the power consumption.

  That is, when the FD activation timer is set to a short time, the mobile device transitions to the idle state immediately after the end of data communication, so that the power consumption of the mobile device can be reduced. However, when it becomes necessary to resume data communication by new or retransmission after the transition to the idle state in the mobile device, it is necessary to transition the mobile device from the idle state to the communication state, and the data communication delay time associated with the transition Will occur.

  On the other hand, when the FD activation timer is set to a long time, the mobile device maintains the communication state for a while after the data communication is completed. For example, when it is necessary to restart data communication by new or retransmission between time T1 and time T2 in FIG. 1, the mobile device remains in the communication state, so the delay time of data communication due to the extra state transition It does not occur and the connection time can be shortened. However, since the mobile device maintains the communication state for a while after the data communication is completed, the power consumption of the mobile device cannot be significantly reduced. Therefore, when setting the FD activation timer, it is necessary to set a timer value considering the trade-off described above.

  In recent years, many smart phones are used as mobile devices. In the case of a smart phone, since data communication occurs in the background, the proportion of the communication state is larger than that of a feature phone that is a mobile device that has been conventionally used. As the communication state increases in the mobile device, the following problems occur when the mobile device moves. That is, when cell movement is required at the time of movement in the mobile device, cell movement is performed by handover in the communication state, so that many neighboring cell measurement and C-Plane sequences occur. Therefore, in the mobile device, the battery life in the connected state is worse when moving compared to the stationary state.

  Then, this invention is made | formed in view of this subject, and it aims at providing the mobile device and state transition timer setting method which can reduce the power consumption of a mobile device more efficiently.

  In order to solve the above-described problem, the mobile device of the present invention includes a speed acquisition unit that acquires the moving speed of the own device, and a state transition timer related to a time until the state of the own device is changed from the communication state to the power saving state. Timer determining means for determining based on the moving speed acquired by the speed acquiring means, and timer setting means for setting the state transition timer determined by the timer determining means in its own device.

  Further, the state transition timer setting method of the present invention is a state transition timer setting method executed by a mobile device, wherein the mobile device speed acquisition means acquires the travel speed of the mobile device, and the mobile device A timer determining step for determining a state transition timer related to a time until the state of the own device is changed from the communication state to the power saving state based on the moving speed acquired in the speed acquiring step; The timer setting means includes a timer setting step for setting the state transition timer determined in the timer determination step in the own device.

  According to such a mobile device and state transition timer setting method, the state determination timer is determined by the timer determination unit based on the moving speed of the mobile device acquired by the speed acquisition unit. Then, the determined state transition timer is set in the mobile device by the timer setting means. With this configuration, it is possible to dynamically determine and set the state transition timer according to the moving speed of the mobile device. For example, if the mobile device is moving, set the state transition timer to a short time, and after the data communication is completed, the mobile device immediately transitions to the power saving state. Since the reselection processing with a small load is possible in the state, the power consumption of the mobile device can be reduced and the load on the network side can be reduced. Also, for example, if the mobile device is stationary or moving at low speed, set a long state transition timer and keep the mobile device in a communication state for a while after the data communication is completed, so that an extra state transition is made when data communication is resumed. In addition to preventing the occurrence of a data communication delay time, the connection time can be shortened, and the load due to frequent state transitions can be reduced. Thus, the power consumption of the mobile device can be more efficiently reduced.

  In the mobile device of the present invention, it is preferable that the timer determining unit determines the state transition timer to be shorter than a predetermined set time when the moving speed acquired by the speed acquiring unit is larger than a predetermined threshold. . By adopting such a configuration, when the moving speed of the mobile device is larger than a predetermined threshold, the state transition timer is set to a time shorter than the predetermined setting time, so that the mobile device immediately shifts to the power saving state after the data communication is completed. Can be made. In general, when the moving speed of a mobile device is high, the frequency of cell movement increases, and when cell movement becomes necessary, reselection processing with a low load is possible in the power saving state. The power can be reduced and the load on the network side can be reduced.

  In the mobile device of the present invention, it is preferable that the timer determining unit determines the state transition timer to be longer than a predetermined set time when the moving speed acquired by the speed acquiring unit is smaller than a predetermined threshold. . With such a configuration, when the moving speed of the mobile device is smaller than a predetermined threshold, the mobile device can be kept in a communication state for a while after the data communication is completed by setting the state transition timer to a time longer than a predetermined setting time. it can. In general, when the moving speed of a mobile device is low, the frequency of cell movement is low. Therefore, even if the mobile device is kept in a communication state in this way, the occurrence of cell movement in a handover with a heavy load on the mobile device and the network side occurs. Less frequently. On the other hand, by maintaining the communication state, it is possible to prevent the occurrence of a data communication delay time associated with an extra state transition when resuming data communication, to shorten the connection time, and to reduce the load caused by frequent state transitions. Can be reduced.

  In addition, the mobile device of the present invention further includes a remaining amount acquisition unit that acquires a remaining battery level of the own device, and the timer determination unit is configured to store the remaining amount when the moving speed acquired by the speed acquisition unit is smaller than a predetermined threshold. It is preferable to determine the state transition timer based on the battery remaining amount acquired by the amount acquisition means. With this configuration, when the moving speed of the mobile device is smaller than a predetermined threshold, the state transition timer can be set based on the remaining battery level of the mobile device. For example, when the remaining battery level is large, it may be set to a state transition timer that can easily maintain the communication state, and when the remaining battery level is small, it may be set to a state transition timer that can immediately shift to the power saving state. It is possible to reduce the power consumption of the mobile device more efficiently while suppressing the influence on data communication.

  The mobile device of the present invention further includes timer acquisition means for acquiring a state transition timer, and the timer determination means is configured such that the state transition timer acquired by the timer acquisition means is longer than a predetermined threshold and the speed acquisition means When the acquired moving speed is larger than a predetermined threshold, it is preferable to determine the state transition timer to be shorter than the state transition timer acquired by the timer acquisition unit. With this configuration, for example, if the value of the state transition timer designated (acquired) from the outside such as the network side is set in the mobile device as it is, cell movement frequently occurs in handover with heavy load on the mobile device and the network side. Even in such a case, it is possible to set (reread) the state transition timer having a shorter time on the mobile device side. As a result, by moving the mobile device to the power saving state immediately after the data communication is completed, when cell movement becomes necessary, reselection processing with a low load is possible in the power saving state. Power consumption can be reduced, and the load on the network side can be reduced.

  In the mobile device of the present invention, the state transition timer is a time from when the data communication of the own device is completed until a transition request instruction for requesting the base station to make a transition to the power saving state is transmitted. It is preferable that the shortest transmission interval at which the own device transmits the transition request instruction after the own device transmits the transition request command after the end of the data communication. By embodying the state transition timer in this way, it is possible to more precisely control the time until the state of the mobile device transitions from the communication state to the power saving state, so the power consumption of the mobile device is more efficient. Can be reduced.

  According to the present invention, power consumption of a mobile device can be more efficiently reduced.

It is the figure which showed the transition on the time series of the state and power consumption in the mobile apparatus to which Fast Dormancy was applied. 1 is a schematic diagram of a mobile communication system according to an embodiment of the present invention. It is a functional block diagram which shows the structure of the mobile apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the hardware constitutions of the mobile apparatus which concerns on embodiment of this invention. It is a figure which shows the example of the state transition of the base station which concerns on embodiment of this invention, and a mobile device. It is a figure which shows another example of the state transition of the base station which concerns on embodiment of this invention, and a mobile station. It is a figure which shows the example of a table of the state transition timer determination table which concerns on embodiment of this invention. It is a sequence diagram which shows the process of the state transition timer setting method performed with the mobile apparatus which concerns on 1st Embodiment of this invention. It is a functional block diagram which shows the structure of the mobile apparatus which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows the process of the state transition timer setting method performed with the mobile apparatus which concerns on 2nd Embodiment of this invention. It is a functional block diagram which shows the structure of the mobile apparatus which concerns on 3rd Embodiment of this invention. It is a sequence diagram which shows the process of the state transition timer setting method performed with the mobile apparatus which concerns on 3rd Embodiment of this invention.

  Hereinafter, preferred embodiments of a mobile device and a state transition timer setting method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 2 is a schematic diagram of the mobile communication system 3 including the mobile device 1 and the base station 2 according to the present embodiment. As shown in FIG. 2, the mobile communication system 3 includes a mobile device 1 and a base station 2. The mobile device 1 and the base station 2 included in the mobile communication system 3 shown in FIG. 2 are each one, but the present invention is not limited to this, and a plurality of mobile devices may be provided. The mobile device 1 and the base station 2 can perform wireless communication in mobile communication with each other.

  Specifically, the mobile communication system 3, the mobile device 1, and the base station 2 are respectively connected to UMTS (Universal Mobile Telecommunications System), UE (User Equipment), and BTS (Base Transceiver Station) in 3GPP (3rd Generation Partnership Project) standards. Correspond. Note that the base station 2 may be an RNC (Radio Network Controller), which is a radio control station in the 3GPP standard, or may be an apparatus having both functions of BTS and RNC. Moreover, the mobile communication system 3, the mobile device 1, and the base station 2 correspond to EPS (Evolved Packet System), UE, and eNodeB (evolved NodeB) in the 3GPP standard, respectively.

[First Embodiment]
FIG. 3 is a functional block diagram showing the configuration of the mobile device 1 according to the first embodiment. As shown in FIG. 3, the mobile device 1 includes a speed acquisition unit 10 (speed acquisition unit), a timer determination unit 11 (timer determination unit), and a timer setting unit 12 (timer setting unit).

  FIG. 4 is a diagram illustrating an example of a hardware configuration of the mobile device 1. As shown in FIG. 4, the mobile device 1 shown in FIG. 3 physically includes a CPU 20, a RAM 21 and a ROM 22 that are main storage devices, an input / output device 23 such as a keyboard and a display, a communication module 24, and an auxiliary storage. The computer system includes the device 25 and the like. The mobile device 1 may further include a GPS (Global Positioning System) function and an acceleration sensor.

  The functions of the functional blocks of the mobile device 1 shown in FIG. 3 are the functions of the input / output device 23 under the control of the CPU 20 by loading predetermined computer software on the hardware such as the CPU 20 and the RAM 21 shown in FIG. This is realized by operating the communication module 24 and the auxiliary storage device 25 and reading and writing data in the RAM 21. Note that the mobile device 1A and the mobile device 1B described in the following embodiments also have the same computer system configuration as that of the mobile device 1.

  Hereinafter, each functional block of the mobile device 1 shown in FIG. 3 will be described.

  The speed acquisition unit 10 of the mobile device 1 acquires the travel speed of the mobile device 1. Specifically, the speed acquisition unit 10 determines and acquires the movement and movement speed of the mobile device 1 based on the fading fluctuation of the downlink pilot channel, the cell crossing frequency, and the data acquired by the GPS function or the acceleration sensor. . The mobile device 1 may acquire the moving speed of the mobile device 1 calculated by a server other than the mobile device 1 from the server via communication.

  The timer determination unit 11 of the mobile device 1 determines a state transition timer related to the time until the state of the mobile device 1 is changed from the communication state to the power saving state based on the moving speed acquired by the speed acquisition unit 10. Specifically, the timer determination unit 11 determines the state transition timer to be shorter than a predetermined set time when the moving speed acquired by the speed acquisition unit 10 is larger than a predetermined threshold. The timer determination unit 11 determines the state transition timer to be longer than a predetermined set time when the moving speed acquired by the speed acquisition unit 10 is smaller than a predetermined threshold.

  Here, a specific example of the power saving state (idle state) will be described. In the 3GPP standard, RRC connection mode (RRC Connected Mode) and RRC idle mode (RRC Idle Mode) are defined as RRC (Radio Resource Control) state transitions. A CELL_FACH (Forward Access Channel) state, a CELL_PCH (Cell Paging Channel) state, and a URA_PCH (URA Paging Channel) state are defined. The power saving state in the present embodiment is, for example, any one or more of an RRC idle mode, a CELL_FACH state, a CELL_PCH state, and a URA_PCH state.

  Here, the CELL_PCH state means that no dedicated channel is allocated to the UE, Downlink receives a Paging Channel via PICH (Paging Indication Channel) by intermittent reception, and has no channel as an Uplink. There is no state. Note that UTRAN (UMTS Terrestrial Radio Access Network) knows the location of the UE at the cell level.

Next, a specific example of the state transition timer will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of state transition of the mobile device 1 and the base station 2 in time series. First, when communication data is generated in the mobile device 1 at time T10, the mobile device 1 and the base station 2 transition to a communication state, and data communication is performed between the mobile device 1 and the base station 2. Then, the data communication is completed at time T11, the FD activation timer (period A) is started for a certain period of time after the data communication is terminated, and the FD activation timer expires at time T12. Then, the mobile station 1 transmits an SCRI (Signaling Channel Release Indication) message, which is a radio release request, to the base station 2 at time T12. As a response, the base station 2 transmits to the mobile station 1 time T13. Transmits a transition instruction to the power saving state, and the mobile device 1 receives the transition instruction at time T14. Regarding SCRI, refer to Section 8.1.14 in Reference Document 1 below.
[Reference 1: 3GPP TS 25.331 V11.0.0 (2011-12)]

  Then, at time T14, the mobile device 1 and the base station 2 transition from the communication state to the power saving state. Next, when the mobile device 1 generates communication data again at time T15, the mobile device 1 and the base station 2 transition to the communication state, and data communication is performed between the mobile device 1 and the base station 2. The time when the data communication ends at time T16 and the FD activation timer expires from time T16 is defined as time T17.

  Here, it is assumed that the mobile station 1 is assigned a T323 timer, which is the shortest SCRI transmission interval, from the base station 2. The T323 timer is a minimum value of the interval between two SCRI messages that the mobile device 1 is permitted to transmit, as defined in 3GPP. In FIG. 5, when the period from time T12 to time T18 (arrow B) is a T323 timer, the mobile device 1 cannot transmit an SCRI message during the period from time T12 to time T18. Subsequently, the mobile device 1 transmits an SCRI message to the base station 2 at time T18, and in response, the base station 2 transmits an instruction to transition to the power saving state to the mobile device 1 at time T19. Then, the mobile device 1 receives the transition instruction at time T20.

  The state transition timer is the time from the end of data communication of the mobile device 1 to the transmission of a transition request instruction for requesting the base station 2 to enter the power saving state, or after the data communication of the mobile device 1 ends It includes any one of the shortest transmission intervals at which the mobile device 1 can transmit the transition request instruction next after the device 1 transmits the transition request instruction. That is, the state transition timer includes one of an FD activation timer (a period indicated by an arrow A in FIG. 5) or a T323 timer (a period indicated by an arrow B in FIG. 5). Note that a period from time T11 when data communication ends in FIG. 5 to time T14 when the mobile device 1 transitions to the power saving state may be used as the FD activation timer, as in the period T shown in FIG.

  Further, in FIG. 5, the mobile device 1 has been described as transitioning from the communication state to the power saving state at the time T <b> 14 when receiving the transition instruction from the base station 2 to the power saving state, but the present invention is not limited to this. FIG. 6 is a diagram illustrating another example of the state transition of the mobile device 1 and the base station 2 in time series. As illustrated in FIG. 6, the mobile device 1 may transition from the communication state to the power saving state at time T12 when the SCRI message is transmitted.

  Next, a specific process in which the timer determination unit 11 determines the state transition timer based on the moving speed of the mobile device 1 will be described with reference to FIG. FIG. 7 is a diagram illustrating a table example of a state transition timer determination table that is referred to when the timer determination unit 11 determines a state transition timer. As shown in FIG. 7, in the state transition timer determination table, the moving speed, the FD activation timer, and the T323 timer are stored in association with each other. For example, when the state transition timer determination table shown in FIG. 7 is used and the moving speed is stationary (such as less than 0 km / h or less than 1 km / h), the timer determination unit 11 sets the FD activation timer to a default value, for example, 8 seconds, or the T323 timer is determined to be, for example, 30 seconds which is the T323 timer value designated by the base station 2. For example, when the moving speed is 30 km / h or more and less than 90 km / h, the timer determination unit 11 sets the FD activation timer to the shorter of the default value and 7 seconds, or the T323 timer specified by the base station 2 to T323. The smaller one of the timer value and 20 seconds is determined.

  In the state transition timer determination table shown in FIG. 7, examples of cell intervals and cell spanning times are also stored in association with each other. For example, when the cell interval is 1 km and the moving speed is 90 km / h, the crossing time is calculated as 1/90 (h) = 60 × 60/90 (s) = 40 (s). The timer determination unit 11 can suppress the occurrence of cell movement at handover by determining the state transition timer based on this straddling time (for example, by determining the state transition timer at approximately the same time as the straddling time). Thus, it is possible to determine a state transition timer that can more efficiently reduce the power consumption of the mobile device 1 while suppressing the influence on the data communication of the mobile device 1.

  The timer setting unit 12 sets (reflects or updates) the state transition timer determined by the timer determination unit 11 in the mobile device 1. The state transition timer is set in the mobile device 1 by setting the state transition timer by the timer setting unit 12. When the state transition timer is enabled in the mobile device 1, the state of the mobile device 1 transitions from the communication state to the power saving state based on the state transition timer.

  Next, processing of the state transition timer setting method in the mobile device 1 according to the present embodiment will be described using FIG.

  First, the moving speed of the mobile device 1 is acquired by the speed acquiring unit 10 (step S1, speed acquiring step), and it is determined whether or not the moving speed acquired in S1 is greater than a predetermined threshold by the timer determining unit 11. (Step S2). If it is determined in S2 that the timer is large, the timer determination unit 11 determines the state transition timer to be shorter than a predetermined set time (step S3, timer determination step). Subsequent to S3 (and S5 described later), the timer setting unit 12 sets the determined state transition timer in the mobile device 1 (step S4, timer setting step). Here, if it is determined in S2 that it is not large, the timer determination unit 11 determines the state transition timer to be longer than a predetermined set time (step S5, timer determination step).

  Next, the effect of the mobile device 1 configured as in the first embodiment will be described.

  According to the mobile device 1 and the state transition timer setting method of the first embodiment, the state determination timer is determined by the timer determination unit 11 based on the moving speed of the mobile device 1 acquired by the speed acquisition unit 10. Then, the determined state transition timer is set in the mobile device 1 by the timer setting unit 12. If such a configuration is adopted, the state transition timer can be dynamically determined and set according to the moving speed of the mobile device 1. For example, when the mobile device 1 is moving, if the cell movement becomes necessary by setting the state transition timer short and making the mobile device 1 transition to the power saving state immediately after the end of data communication, Since the reselection processing with a small load is possible in the power saving state, the power consumption of the mobile device 1 can be reduced and the load on the network side can be reduced. Also, for example, when the mobile device 1 is moving at a low speed or at a low speed, the state transition timer is set to be long, and the mobile device 1 is kept in a communication state for a while after the data communication is completed. It is possible to prevent the occurrence of a data communication delay time associated with the state transition, shorten the connection time, and reduce the load caused by frequent state transitions. Thus, the power consumption of the mobile device 1 can be more efficiently reduced.

  Further, according to the mobile device 1, the timer determining unit 11 determines the state transition timer to be shorter than the predetermined set time when the moving speed acquired by the speed acquiring unit 10 is larger than the predetermined threshold. Is preferred. By adopting such a configuration, when the moving speed of the mobile device 1 is greater than a predetermined threshold, the state transition timer is set to a time shorter than a predetermined set time, so that the mobile device 1 can be put into a power saving state immediately after the data communication ends. Can be transitioned to. In general, when the moving speed of the mobile device 1 is high, the cell moving frequency becomes high, and when the cell needs to be moved, a reselection process with a small load can be performed in the power saving state. Power consumption can be reduced, and the load on the network side can be reduced.

  Further, according to the mobile device 1, the timer determination unit 11 determines the state transition timer to be longer than the predetermined set time when the moving speed acquired by the speed acquisition unit 10 is smaller than the predetermined threshold. Is preferred. With this configuration, when the moving speed of the mobile device 1 is smaller than a predetermined threshold, the state transition timer is set to a time longer than a predetermined setting time, so that the mobile device 1 is kept in a communication state for a while after the data communication ends. be able to. In general, when the moving speed of the mobile device 1 is low, the cell moving frequency is low. Therefore, even if the mobile device 1 is kept in the communication state in this way, the cell in the handover with a heavy load on the mobile device 1 and the network side. The frequency of movement is low. On the other hand, by maintaining the communication state, it is possible to prevent the occurrence of a data communication delay time associated with an extra state transition when resuming data communication, to shorten the connection time, and to reduce the load caused by frequent state transitions. Can be reduced. In addition, when the mobile device 1 is moving at a low speed or at a low speed, the frequency of cell movement is low, so if the state transition timer is shortened, there is a possibility that the load caused by frequently starting Fast Dormancy may be a disadvantage. .

  Further, according to the mobile device 1, the state transition timer is the time from when the data communication of the mobile device 1 ends until the base station 2 transmits a transition request instruction for requesting the transition to the power saving state (FD activation) Corresponding to a timer) or the shortest transmission interval at which the mobile device 1 can transmit the transition request instruction after the mobile device 1 transmits the transition request command after the data communication of the mobile device 1 ends (in the T323 timer) It is preferable that Since the state transition timer is embodied in this way, the time until the state of the mobile device 1 is changed from the communication state to the power saving state can be controlled more precisely, so the power consumption of the mobile device 1 can be reduced. It can reduce more efficiently.

[Second Embodiment]
Next, a mobile device 1A according to the second embodiment will be described with reference to FIG. FIG. 9 is a functional block diagram showing the configuration of the mobile device 1A according to the second embodiment. As shown in FIG. 9, the mobile device 1A includes a speed acquisition unit 10A (speed acquisition unit), a timer determination unit 11A (timer determination unit), a timer setting unit 12A (timer setting unit), and a remaining amount acquisition unit 13A (remaining amount acquisition). Means).

  Hereinafter, each functional block of the mobile device 1A shown in FIG. 9 will be described. The speed acquisition unit 10A, the timer determination unit 11A, and the timer setting unit 12A have substantially the same functions as the speed acquisition unit 10, the timer determination unit 11, and the timer setting unit 12 of the mobile device 1 according to the first embodiment, respectively. In the following, only the difference will be described.

  The remaining amount acquisition unit 13A acquires the remaining battery level of the mobile device 1. When the moving speed acquired by the speed acquisition unit 10A is smaller than a predetermined threshold, the timer determination unit 11A determines a state transition timer based on the battery remaining amount acquired by the remaining amount acquisition unit 13A. Specifically, when the remaining battery level acquired by the remaining level acquisition unit 13A is greater than a predetermined threshold, the timer determination unit 11A determines a value that facilitates maintaining the communication state, for example, the FD activation timer as 20 seconds.

  Next, processing of the state transition timer setting method in the mobile device 1A according to the present embodiment will be described using FIG. In FIG. 10, steps SA1 to SA4 are the same as steps S1 to S4 shown in FIG. 8 for explaining the state transition timer setting method in the mobile device 1 according to the first embodiment, and thus the description thereof is omitted.

  In SA2, if the timer determination unit 11A determines that the movement speed acquired in SA1 is not greater than a predetermined threshold value, the remaining battery level is acquired by the remaining amount acquisition unit 13A, and the acquired remaining battery level is acquired. If the amount is greater than the predetermined threshold, the timer determination unit 11A determines the state transition timer to be longer than the predetermined set time (step SA5).

  Next, the operation and effect of the mobile device 1A configured as in the second embodiment will be described.

  According to the mobile device 1A of the second embodiment, the mobile device 1A further includes a remaining amount acquisition unit 13A that acquires the battery remaining amount of the mobile device 1A, and the timer determination unit 11A has a predetermined movement speed acquired by the speed acquisition unit 10A. When it is smaller than the threshold value, it is preferable to determine the state transition timer based on the remaining battery amount acquired by the remaining amount acquisition unit 13A. With this configuration, when the moving speed of the mobile device 1A is smaller than a predetermined threshold, the state transition timer can be set based on the remaining battery level of the mobile device 1A. For example, when the remaining battery level is large, it may be set to a state transition timer that can easily maintain the communication state, and when the remaining battery level is small, it may be set to a state transition timer that can immediately shift to the power saving state. It is possible to reduce the power consumption of the mobile device 1A more efficiently while suppressing the influence on data communication.

[Third Embodiment]
Next, the mobile device 1B according to the third embodiment will be described with reference to FIG. FIG. 11 is a functional block diagram showing the configuration of the mobile device 1B according to the third embodiment. As shown in FIG. 11, the mobile device 1B includes a speed acquisition unit 10B (speed acquisition unit), a timer determination unit 11B (timer determination unit), a timer setting unit 12B (timer setting unit), and a timer acquisition unit 14B (timer acquisition unit). It is comprised including.

  Hereinafter, each functional block of the mobile device 1B illustrated in FIG. 11 will be described. The speed acquisition unit 10B, the timer determination unit 11B, and the timer setting unit 12B have substantially the same functions as the speed acquisition unit 10, the timer determination unit 11, and the timer setting unit 12 of the mobile device 1 according to the first embodiment, respectively. In the following, only the difference will be described.

  The timer acquisition unit 14B acquires a state transition timer. Specifically, the timer acquisition unit 14B acquires a T323 timer transmitted from the network-side base station 2 or the like by broadcast information. The timer acquisition unit 14B may acquire a state transition timer determined by another server.

  The timer determination unit 11B sets the state transition timer when the state transition timer acquired by the timer acquisition unit 14B is longer than a predetermined threshold and the moving speed acquired by the speed acquisition unit 10B is larger than the predetermined threshold. For example, a time shorter than the state transition timer acquired by the timer acquisition unit 14B.

  Next, processing of the state transition timer setting method in the mobile device 1B according to the present embodiment will be described using FIG.

  First, the timer acquisition unit 14B acquires a T323 timer (state transition timer) (step SB1), and the timer determination unit 11B determines whether the T323 timer acquired in SB1 is longer than a predetermined threshold (reading threshold). Determination is made (step SB2). If it is determined in SB2 that it is long, the moving speed of the mobile device 1 is acquired by the speed acquiring unit 10B (step SB3), and the moving speed acquired in SB3 by the timer determining unit 11B is greater than a predetermined threshold value. It is determined whether or not (step SB4). If it is determined in SB4 that the timer is large, the timer determination unit 11B determines that the T323 timer is shorter than a predetermined set time (step SB5). Subsequent to SB5 (and SB7 described later), the determined T323 timer is set in the mobile device 1 by the timer setting unit 12B (step SB6). Here, when it is determined that it is not long in SB2 and when it is determined that it is not large in SB4, the timer determining unit 11B determines the T323 timer as a default value (step SB7).

  Next, the effect of the mobile device 1B configured as in the third embodiment will be described.

  According to the mobile device 1B of the third embodiment, the timer acquisition unit 14B that acquires a state transition timer is further provided, and the timer determination unit 11B has a state transition timer acquired by the timer acquisition unit 14B that is longer than a predetermined threshold value. And when the moving speed acquired by the speed acquisition part 10B is larger than a predetermined threshold value, it is preferable to determine the state transition timer to be shorter than the state transition timer acquired by the timer acquisition part 14B. If such a configuration is adopted, for example, if the value of the state transition timer designated (acquired) from the outside such as the network side is set as it is in the mobile device 1B, cell movement is frequently performed in the mobile device 1B and the network side heavy load handover. Even if it occurs, a state transition timer with a shorter time can be set (replaced) on the mobile device 1B side. As a result, the mobile device 1B immediately transitions to the power saving state after the data communication is completed, so that when cell movement becomes necessary, a reselection process with a low load is possible in the power saving state. The power consumption of 1B can be reduced, and the load on the network side can be reduced.

  The detailed effect of the process in SB5 in FIG. 12 will also be described. For example, it is assumed that the mobile device 1B transmits the SCRI to change from the communication state to the power saving state, and then data communication occurs to change from the power saving state to the communication state (CELL_DCH state). If the T323 timer is not reread when there is no communication after that, the SCRI cannot be transmitted until the T323 timer expires, so the communication state is maintained, and handover processing is likely to occur during movement. . For example, if the T323 timer is 120 seconds, the cell interval is 1 km, and the moving speed is 90 km / h, the stay time of one cell is about 40 seconds (see the calculation in the first embodiment), and communication is performed once after Fast Dormancy. If it occurs, the next SCRI cannot be transmitted until the handover is performed three times. If the T323 timer is read shortly, the SCRI can be transmitted even in such a case, and cell transition is facilitated by reselection, which leads to reduction of the battery life and the C-Plane sequence load.

  Finally, supplementary explanation will be given of the operational effects of the mobile device 1 (including the mobile device 1A and the mobile device 1B) configured as in the first to third embodiments.

  According to the mobile device 1 of the present embodiment, when movement is detected, the activation of Fast Dormancy can be accelerated to reduce battery consumption. Conventionally, the time from the communication state to the transition to the power saving state (for example, the idle state) is constant regardless of the moving speed. According to the mobile device 1 of the present embodiment, it is possible to reduce the power consumption of the mobile device 1 and the load on the network side while suppressing the influence on data communication. More specifically, since many cell transitions occur when the mobile device 1 moves, the network state is increased from the communication state that requires the measurement of neighboring cells and the handover process with many C-Plane sequences (the network is increased by increasing the C-Plane sequence). In order to increase the proportion of the power saving state in which reselection processing with a low load is possible), the state transition trigger and the state transition timer are shortened according to the moving speed.

  1 · 1A · 1B ... mobile station, 2 ... base station, 3 ... mobile communication system, 10 · 10A · 10B ... speed acquisition unit, 11 · 11A · 11B ... timer determination unit, 12 · 12A · 12B ... timer setting unit, DESCRIPTION OF SYMBOLS 13A ... Remaining amount acquisition part, 14B ... Timer acquisition part, 20 ... CPU, 21 ... RAM, 22 ... ROM, 23 ... Input / output device, 24 ... Communication module, 25 ... Auxiliary storage device.

Claims (7)

Speed acquisition means for acquiring the moving speed of the own aircraft;
Timer determining means for determining a state transition timer related to a time until the state of the own apparatus is changed from the communication state to the power saving state based on the moving speed acquired by the speed acquiring means;
Timer setting means for setting the state transition timer determined by the timer determining means in its own machine;
Mobile machine equipped with. The timer determining means determines the state transition timer to be shorter than a predetermined set time when the moving speed acquired by the speed acquiring means is greater than a predetermined threshold;
The mobile device according to claim 1. The timer determining means determines the state transition timer to be longer than a predetermined set time when the moving speed acquired by the speed acquiring means is smaller than a predetermined threshold;
The mobile device according to claim 1 or 2, characterized in that It further comprises a remaining amount acquisition means for acquiring the battery level of the own device,
The timer determining unit determines a state transition timer based on the remaining battery level acquired by the remaining amount acquiring unit when the moving speed acquired by the speed acquiring unit is smaller than a predetermined threshold;
The mobile device according to claim 1 or 2, characterized in that A timer acquisition means for acquiring a state transition timer;
The timer determination means sets the state transition timer when the state transition timer acquired by the timer acquisition means is longer than a predetermined threshold and the moving speed acquired by the speed acquisition means is greater than a predetermined threshold. Determine a time shorter than the state transition timer acquired by the timer acquisition means,
The mobile device according to claim 1. The state transition timer is the time from the end of the data communication of the own device until the transmission of the transition request instruction for requesting the transition to the power saving state to the base station, or after the end of the data communication of the own device It is the shortest transmission interval at which the own device can transmit the transition request instruction next after transmitting the transition request instruction.
The mobile device according to any one of claims 1 to 5, wherein: A state transition timer setting method executed by a mobile device,
A speed acquisition step in which the speed acquisition means of the mobile device acquires the moving speed of the mobile device;
Timer determination step for determining a state transition timer related to the time until the state of the own device transitions from the communication state to the power saving state based on the moving speed acquired in the speed acquiring step. When,
A timer setting step in which the timer setting means of the mobile device sets the state transition timer determined in the timer determination step in the own device;
State transition timer setting method including

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