JP2010258735A - Portable telephone set and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone set and a control program, suppressing excessive power consumption by the repetition of cell reselection in the same cells. <P>SOLUTION: In the portable telephone set which performs radio communication with the base stations of respective cells, the execution time of a cell reselecting operation when the cell reselecting operation is executed in an area where the plurality of cells overlap and information specifying the cells before and after transfer are associated and stored in a storage part. When the cell reselecting operation is performed for a stipulated number of times or more within a stipulated time between the cells stored in the storage part, processing for weighting and smoothing the reception level of the respective cells is performed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mobile phone device and a control program, and more particularly to a cell reselection operation suppressing function in a mobile phone device and a control program for executing the function.

  When the user who owns the mobile phone device is in a place where two cells can be seen at the same level as shown in FIG. 1, even if the mobile phone device is not moved, fading and interference as shown in FIG. Since the reception level of each cell varies depending on the degree, cell reselection (cell reselection operation) may be repeated between the cells. In such a case, although the user is not using the mobile phone device, there is a problem that excessive power consumption occurs and the battery runs out.

  In particular, when Cell reselection is performed for cells with different LAI values, Location Updating (hereinafter abbreviated as LU) processing is performed, and when Cell reselection is performed for cells with different RAI values. , Routing Area Updating (hereinafter abbreviated as RAU) processing and LU processing. When performing LU processing and RAU processing, unlike the IDLE state, which is a standby state, a DPCH (Dedicated Physical CHannel) state in which communication with the base station is performed, and thus more power is consumed.

  As a technique related to the cell selection described above, for example, in Patent Document 1 below, cell reselection control means for performing a cell reselection operation for reselecting a local station cell, and a cell that has been previously set as the local station cell, are disclosed. Counting means that counts the number of times the cell is newly selected by the selection operation, timing means for timing a predetermined time, and when the count value by the counting means reaches a predetermined number before the timing operation by the timing means expires A cell reselection device comprising: a flicker occurrence determination unit that determines that a flutter of a cell reselection operation has occurred; and a suppression control unit that suppresses a cell reselection operation when it is determined that a flutter has occurred. ing.

  Further, in Patent Document 2 below, the own cell broadcast information receiving step for receiving a first offset value that changes according to the load of the own cell as broadcast information from the own cell, and the load on the neighboring cell as broadcast information from the neighboring cell. A neighboring cell broadcast information receiving step for receiving a second offset value that changes in response, a own cell propagation level measuring step for measuring a propagation level of the own cell, a neighboring cell propagation level measuring step for measuring a propagation level of the neighboring cell, A comparison step of comparing a value obtained by adding the offset value of 1 to the propagation level of the own cell with a value obtained by adding the second offset value to the propagation level of the neighboring cells, and a cell selection step of performing cell selection based on the comparison result , A cell selection method is disclosed.

2006-157217 2008-172373

  However, since the techniques of Patent Documents 1 and 2 are weighting methods for each cell, it is effective when the reception levels of the local cell and the neighboring cells are equal and the magnitude relationship between the reception levels is reversed. Cell reselection operation cannot be suppressed

  The present invention has been made in view of the above problems, and its main purpose is to provide a mobile phone device and a control program capable of suppressing excessive power consumption due to repeated cell reselection between the same cells. It is to provide.

  In order to achieve the above object, the present invention provides a mobile phone device that performs radio communication with a base station of each cell, and performs the cell reselection operation when the cell reselection operation is performed in an area where a plurality of cells overlap. When the execution time and the information for identifying the cells before and after the transition are associated with each other and stored in the storage unit, and a cell reselection operation is performed more than a specified number of times within a specified time between the cells stored in the storage unit In addition, the reception level of each cell is weighted and smoothed.

  Further, the present invention provides a control program that operates in a mobile phone device that performs wireless communication with a base station of each cell, and the mobile phone device performs a cell reselection operation in an area where a plurality of cells overlap. The cell reselection operation time and the information for identifying the cells before and after the transition are associated with each other and stored in the storage unit, and the cells stored in the storage unit more than a specified number of times within a specified time When the reselection operation is performed, the cell selection function is made to function as a cell reselection operation suppression unit that weights and smoothes the reception level of each cell.

  According to the mobile phone device and the control program of the present invention, it is possible to suppress excessive power consumption due to repeated cell reselection between the same cells.

  The reason for this is that when the cell reselection is performed more than the specified number of times between the same cells, the weighting for smoothing used to measure the reception level of the currently registered cell and the transition candidate cell is changed. This is because cell reselection can be effectively suppressed.

It is a figure which shows typically the state in which a mobile telephone apparatus exists in the place where two Cell can be seen at an equivalent level. It is a figure explaining cell reselection when a mobile phone device is in a place where two cells can be seen at the same level. It is a block diagram which shows the structure of the mobile telephone apparatus which concerns on one Example of this invention. It is a figure which shows the fluctuation | variation of the reception level in the case of keeping the value measured without smoothing. It is a figure which shows the fluctuation | variation of the reception level when weighting of smoothing is made equivalent by Active Cell and Monitor Cell. It is a figure which shows the fluctuation | variation of the reception level at the time of changing weighting of smoothing with Active Cell and Monitor Cell. It is a figure which shows the implementation time of Cell reselection, and the scrambling code of Cell before transfer, and Cell after transfer. It is a flowchart figure which shows operation | movement of the mobile telephone apparatus based on one Example of this invention.

  As shown in the background art, when there is a mobile phone device where two cells can be seen at the same level, the reception level of each cell varies depending on the degree of fading and interference, and cell reselection is repeated between the cells. There is a problem of consuming excess power.

  With respect to this problem, in Patent Document 1, when a flicker of the cell reselection operation occurs, correction is performed by subtracting the correction value from the measurement value of the reception radio wave intensity of the peripheral cell, and the reception radio wave intensity of the peripheral cell Proposes a way to handle low. However, with this method, when the reception level of the local cell and the neighboring cell are the same and the magnitude relationship between the reception levels is repeatedly reversed, the magnitude relation can be subtracted even if the correction value is subtracted from the measurement value of the neighboring cell. There arises a problem that the reversal cannot be effectively suppressed.

  Patent Document 2 proposes a method of comparing an own cell and a peripheral cell by adding an offset value to the cell propagation level. However, even in this method, when the reception levels of the own cell and the neighboring cell are the same and the magnitude relationship between the reception levels is repeatedly reversed, even if an offset value is added, the magnitude relationship is effectively suppressed. The problem of being unable to do so arises.

  Since such a problem is caused by weighting for each cell, the present invention employs a method for weighting each measurement value when smoothing the measurement value in each cell.

  Specifically, when cell reselection is performed more than the specified number of times between the same cells, the reception level is set as a cell that is currently registered (hereinafter referred to as Active Cell) and as a migration candidate cell in Cell reselection. Control that changes the weighting of smoothing when measuring the reception level of the cell being measured (hereinafter referred to as Monitor Cell) (ie, the previous measurement value and the current measurement value when the reception level is smoothed) Control of weighting by multiplying coefficients) is performed to effectively suppress the occurrence of cell reselection.

  In order to describe the above-described embodiment of the present invention in more detail, a mobile phone device and a control program according to an embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a block diagram showing the configuration of the mobile phone device of this embodiment. 4 to 6 are diagrams showing fluctuations in the reception level. FIG. 4 shows the case where the measured values are not smoothed, and FIG. In the case where they are equivalent, FIG. 6 shows a case where the weighting of smoothing is changed between Active Cell and Monitor Cell. FIG. 7 is a diagram showing the implementation time of cell reselection and the scrambling code of the cell before and after the transition, and FIG. 8 is a flowchart showing the operation of the mobile phone device of the present embodiment.

  As shown in FIG. 3, the cellular phone device 10 of this embodiment includes a control unit 11, a wireless communication unit 12, a display unit 13, an operation unit 14, a voice processing unit 15, and the like.

  The control unit 11 includes a memory such as a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU performs a telephone function, a mail function, an Internet (web) connection function, other terminal functions, and control of each unit. In addition to the phone book information, sent / received mail information, incoming / outgoing call information, content information, application program information, setting information of the mobile phone device 10, etc., the time of Cell reselection (to be described later), the Cell before transition, and the Cell after transition This is a part for storing a table for associating with the scrambling code, and the stored information is processed by the CPU.

  In addition, the control unit 11 stores the above table in a memory, determines whether or not the cell reselection is performed more than a specified number of times within a specified time between the scrambling codes described in the table, It also functions as a cell reselection operation suppression unit that changes the weighting of smoothing used to measure Active Cell and Monitor Cell. The cell reselection operation suppression unit may be configured as hardware, or may be configured as a control program that causes a computer to function as the cell reselection operation suppression unit, and the control program may be operated on the control unit 11. . The specified time and the specified number of times can be set by the development vendor of the mobile phone device 10.

  The wireless communication unit 12 transmits and receives information to and from the wireless base station device via an antenna.

  The display unit 13 includes a liquid crystal display (LCD), an organic EL (electroluminescence) display device, and the like, and performs information display output (video signal processing) of images, figures, characters, symbols, and the like.

  The operation unit 14 includes a numeric keypad, a scroll key, a cross key, an enter key, and the like, and inputs various types of user information to the mobile phone device 10.

  The voice processing unit 15 processes a voice signal input / output via the transmission unit (microphone 15b) and the reception unit (speaker 15a).

  FIG. 3 shows an example of the cellular phone device 10 according to the present embodiment, and the configuration thereof can be appropriately changed as long as it has means functioning as the cell reselection operation suppressing unit.

  Next, a specific example of the smoothing weighting in the mobile phone device 10 having the above configuration will be described.

  FIG. 7 is an example of a table that associates the cell reselection execution time with the scrambling code (code that divides each cell) in the cell reselection performed previously. The left side of the scrambling code is the cell before the transition, and the right side is the transition. It is the code of Cell after.

  In normal cases, the smoothing weights are the same for Active Cell and Monitor Cell, but by changing the smoothing weights for Active Cell and Monitor Cell respectively, there is a difference between the measured values of the two cells. And cell reselection between the same cells can be suppressed. An example of weighting for smoothing is described below.

  FIG. 4 shows the fluctuation of the reception level when the value measured without smoothing remains. In this case, since the magnitude relationship between the reception levels of the Active Cell and the Monitor Cell is repeatedly reversed, Cell reselection is repeatedly performed. Therefore, the weighting for smoothing is performed on the previous and current measured values of the Active Cell and the Monitor Cell in Equations 1 to 4 as in Equations 5 to 7.

Last measured value of Active Cell = RA (n-1) ... (1)
Current measured value of Active Cell = RA (n) (2)
Last measured value of Monitor Cell = RM (n-1) (3)
Current measured value of Monitor Cell = RM (n) (4)

Active Cell reception level = [a * RA (n-1) + b * RA (n)] / c (5)
Monitor Cell reception level = [a * RM (n-1) + b * RM (n)] / c (6)
c = a + b (7)

  FIG. 5 shows the variation of the reception level when the smoothing weight is equalized between the Active Cell and the Monitor Cell. In this way, by multiplying the previous measurement value of Active Cell and Monitor Cell by the coefficient a, and multiplying the current measurement value of Active Cell and Monitor Cell by the coefficient b, Active Cell and Monitor Cell Since it becomes difficult to reverse the magnitude relationship of the reception levels, cell reselection between the same cells can be effectively suppressed.

  Moreover, weighting of smoothing can also be performed like Formula 8-10.

Active Cell reception level = [d * RA (n-1) + e * RA (n)] / f (8)
Monitor Cell reception level = [e * RM (n-1) + d * RM (n)] / f (9)
f = d + e (d ≠ e) (10)

  FIG. 6 shows the variation of the reception level when the smoothing weight is changed between the Active Cell and the Monitor Cell. In this way, the previous measurement value of Active Cell and the current measurement value are multiplied by coefficients d and e, respectively, and the previous measurement value and current measurement value of Monitor Cell are multiplied by coefficients e and d, respectively. By combining them, the magnitude relationship between the reception levels of the Active Cell and the Monitor Cell becomes more difficult to reverse, so that cell reselection between the same cells can be more effectively suppressed.

  Note that the above-described smoothing weighting is merely an example, as long as the previous measurement value and the current measurement value of Active Cell and Monitor Cell are multiplied by different coefficients.

  Next, the cell reselection suppressing operation in the mobile phone device of the present invention will be described with reference to the flowchart of FIG.

  When the user is not using the mobile phone device, the mobile phone device enters a standby state (S101). In this standby state, the control unit 11 compares the reception levels of the active cell and the monitor cell, and when the reception level of the active cell deteriorates from the reception level of the monitor cell and satisfies the cell reselection determination (S102), the cell reselection (S103).

  Next, the control unit 11 (cell reselection operation suppressing unit) saves the time when the cell reselection is performed, the cell migrated by the cell reselection, and the scrambling code before the migration, in the memory (S104). And the control part 11 (cell reselection operation | movement suppression part) determines whether the frequency | count of Cell reselection which generate | occur | produced between the same Cell within the regulation time is more than regulation number (S105), and when it is more than regulation number of times. Changes the weighting of smoothing used for the measurement of Active Cell and Monitor Cell (S106), and returns to the standby state of S101.

  As described above, in this embodiment, a table that associates the cell reselection execution time with the cell before transition and the scrambling code of the cell after transition is stored in the memory, and between the scrambling codes stored in the memory in advance, the specified time It is determined whether cell reselection has been performed more than the specified number of times, and if it is implemented, cell reselection can be effectively suppressed by changing the smoothing weight used for the measurement of Active Cell and Monitor Cell. It is possible to suppress excessive power consumption due to repeated cell reselection.

  In the above embodiment, the case where the cell reselection operation is performed between two cells has been described. However, the present invention is not limited to the above embodiment, and the cell reselection operation is performed between three or more cells. The same applies to the case of performing.

  The present invention is applicable to a mobile communication terminal such as a mobile phone device and a control program that operates on the device.

DESCRIPTION OF SYMBOLS 10 Mobile telephone apparatus 11 Control part 12 Wireless communication part 13 Display part 14 Operation part 15 Audio | voice processing part 15a Speaker 15b Microphone

Claims (6)

In the mobile phone device that performs wireless communication with the base station of each cell,
When the cell reselection operation is performed in an area where a plurality of cells overlap, the execution time of the cell reselection operation and the information specifying the cells before and after the transition are stored in the storage unit in association with each other, and the storage unit A cellular phone characterized in that when a cell reselection operation is performed more than a specified number of times within a specified time between stored cells, a process for weighting and smoothing the reception level of each cell is performed. apparatus.   At the time of the smoothing, for each cell, a value obtained by adding a value obtained by multiplying the previous reception level by the first coefficient and a value obtained by multiplying the current reception level by the second coefficient is the first cell. The mobile phone device according to claim 1, wherein division is performed by a value obtained by adding a coefficient and the second coefficient.   During the smoothing, for the currently selected cell, a value obtained by adding a value obtained by multiplying the previous reception level by the first coefficient and a value obtained by multiplying the current reception level by the second coefficient, For a cell that is a candidate for reselection, a value obtained by multiplying the previous reception level by the second coefficient and the current reception level are divided by the value obtained by adding the first coefficient and the second coefficient. 2. The mobile phone according to claim 1, wherein a value obtained by adding the value obtained by multiplying the first coefficient by the first coefficient is divided by a value obtained by adding the first coefficient and the second coefficient. apparatus. A control program that operates on a mobile phone device that performs radio communication with a base station of each cell,
The mobile phone device;
When the cell reselection operation is performed in an area where a plurality of cells overlap, the execution time of the cell reselection operation and the information specifying the cells before and after the transition are stored in the storage unit in association with each other, and the storage unit Functioning as a cell reselection operation suppression unit that weights and smoothes the received level of each cell when the cell reselection operation is performed more than a specified number of times within a specified time between stored cells A control program characterized by   The cell reselection operation suppressing unit, for the smoothing, for each cell, a value obtained by multiplying a previous reception level by a first coefficient and a value obtained by multiplying a current reception level by a second coefficient. The control program according to claim 4, wherein the added value is divided by a value obtained by adding the first coefficient and the second coefficient.   In the smoothing, the cell reselection operation suppressing unit multiplies the current reception level by the second coefficient and the value obtained by multiplying the previous reception level by the first coefficient for the currently selected cell. The value obtained by adding the value is divided by the value obtained by adding the first coefficient and the second coefficient, and for the cell that is a candidate for reselection, the second coefficient is set to the previous reception level. Dividing a value obtained by multiplying the value obtained by multiplying the current reception level by the value obtained by multiplying the first coefficient by the value obtained by adding the first coefficient and the second coefficient. The control program according to claim 4.

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