JP2007028534A - Mobile communication terminal device and mobile communications system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal device and a mobile communications system, capable of surely receiving the data of broadcasting or of multicast. <P>SOLUTION: The mobile communication terminal device, capable of receiving the data of broadcasting or multicast, is provided with a schedule retaining unit 1081 for retaining the transmitting schedule of broadcasting or multicast, a receiving level measuring unit 105 for measuring a plurality of receiving levels of signals of a plurality of neighboring cells to produce a plurality of receiving level measuring values, and a cell-switching control unit 1083 for controlling cell so as to be switched at a time the data are not being distributed, based on the transmitting schedule and the plurality of receiving level measuring values are compared so as to switch to the cell high, in the receiving level measuring value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile communication terminal apparatus and a mobile communication system using a CDMA system, and particularly to a mobile communication terminal apparatus and a mobile communication system compatible with a multimedia broadcast / multicast service (MBMS). It is about.

  A W-CDMA system is known as a mobile communication system using a code division multiple access (CDMA) system. In the W-CDMA system, it is possible to transmit not only audio but also multimedia data such as images. Further, a multimedia broadcast / multicast service (MBMS) that distributes multimedia data to a large number of users at the same time (hereinafter referred to as MBMS: Multimedia Broadcast / Multicast Service) has been proposed.

  Hereinafter, an operation of receiving MBMS data (multicast data) of a mobile communication terminal apparatus in a conventional mobile communication system will be described with reference to the drawings.

  FIG. 22 is a block diagram showing a configuration of a conventional mobile communication system. As shown in FIG. 22, the conventional mobile communication system includes a mobile communication terminal device 10 and a base station 30.

  The mobile communication terminal apparatus 10 includes an antenna 11, a transmission / reception switching unit 12, a reception radio unit 13, a reception control unit 14, a reception level measurement unit 15, a communication control unit 16, a cell table 17, a cell switching control unit 18, and a transmission data generation unit. 19, a transmission control unit 20 and a transmission radio unit 21 are provided.

  The antenna 11 receives wireless data (signal) from the base station 30, generates a reception signal, and provides the reception wireless unit 13 via the transmission / reception switching unit 12. The antenna 11 receives a transmission signal from the transmission radio unit 21 via the transmission / reception switching unit 12, generates a radio transmission signal, and transmits the radio transmission signal. The transmission / reception switching unit 12 switches between a transmission signal and a reception signal. The reception radio unit 13 receives a reception signal from the antenna 11 via the transmission / reception switching unit 12 and performs radio processing on the reception signal.

  The reception control unit 14 controls the reception signal. The reception level measurement unit 15 measures the level of the reception signal. The cell table 17 holds MBMS information. The cell switching control unit 18 controls cell switching based on reception levels of signals from a plurality of cells and MBMS information in the cell table 17.

  The communication control unit 16 controls the reception control unit 14 and the transmission control unit 20 to control data transmission / reception. The transmission data generation unit 19 generates transmission data and gives it to the transmission control unit 20. The transmission control unit 20 gives the transmission data from the transmission data generation unit 19 to the transmission radio unit 21. The transmission radio unit 21 performs radio processing on the transmission data from the transmission control unit 20 to generate a transmission signal, and supplies the transmission signal to the antenna 11 via the transmission / reception switching unit 12. The antenna 11 receives data from the transmission radio unit 21 via the transmission / reception switching unit 12, generates a radio transmission signal, and transmits it to the base station 30.

As described above, in the mobile communication terminal apparatus 10 compatible with MBMS, the cell switching control unit 18 receives the reception level obtained by comparing the reception level of the signal of the cell currently communicating with the reception level of the signals of the neighboring cells. Control is performed to switch from the currently communicating cell to another cell using the comparison result and the information of the surrounding MBMS.
3GPP TS 23.246, 22.246, 25.346

  However, the conventional mobile communication terminal apparatus has a problem in that received data of MBMS data may be lost when switching from the currently communicating cell to another cell.

  Next, this problem will be described in detail.

  FIG. 23 is a diagram for explaining a state of MBMS data reception and cell switching in a conventional mobile communication terminal apparatus. It is assumed that MBMS data is currently received from the cell A, and the reception level of the signals of the cell A and the cell B is measured. As a result, the reception level of the cell B is relatively high and cell switching is performed to the cell B.

  In this case, data may be lost depending on the cell switching time and due to the difference in the transmission timing and reception timing of the data in the two cells. In the example of FIG. 23, data “5” is missing when switching from cell A to cell B is performed.

  Even when necessary data is received in this way, if cell switching is performed, data at the timing of switching may be lost, and necessary data may not be acquired.

  The present invention has been made in view of this point, and an object thereof is to provide a mobile communication terminal apparatus and a mobile communication system that can reliably receive broadcast or multicast data. It is another object of the present invention to provide a mobile communication terminal apparatus and a mobile communication system that can preferentially acquire necessary data among broadcast or multicast data.

  A first aspect of the present invention is a mobile communication terminal apparatus capable of receiving broadcast or multicast data, the schedule holding means for holding the transmission schedule of the broadcast or multicast data, and a plurality of adjacent cells A reception level measuring means for measuring a plurality of reception levels of the signal to generate a plurality of reception level measurement values, and comparing the plurality of reception level measurement values to switch to the cell having a high reception level measurement value. Cell switching control means for controlling to switch the cell at a time when the data is not distributed based on the transmission schedule is adopted.

  According to a second aspect of the present invention, there is provided a mobile communication terminal device capable of receiving broadcast or multicast data, the schedule holding means for holding the transmission schedule of the broadcast or multicast data, and a plurality of adjacent cells. A reception level measuring means for measuring a plurality of reception levels of a signal to generate a plurality of reception level measurement values, and determining a priority of the plurality of data based on the transmission schedule to generate a data priority determination result The priority is low based on the transmission schedule and the data priority determination result when comparing the plurality of reception level measurement values and switching to the cell having the high reception level measurement value Cell switching control means for controlling to switch the cell at a time when the data is distributed; A configuration that includes.

  According to the first aspect of the present invention, since cells are switched at a time when broadcast or multicast data is not distributed, data loss can be prevented and broadcast or multicast data can be reliably received.

  Also, according to the second aspect of the present invention, since cells are switched at a time when low priority data of broadcast or multicast data is distributed, lack of high priority data can be prevented. Therefore, it is possible to preferentially acquire necessary data among broadcast or multicast data.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the mobile communication system according to Embodiment 1 of the present invention includes a mobile communication terminal apparatus 100 and a base station 120. The mobile communication terminal apparatus 100 transmits / receives data to / from the base station 120 wirelessly. The base station 120 transmits MBMS data (multicast data) according to a predetermined transmission schedule.

  The mobile communication terminal apparatus 100 includes an antenna 101, a transmission / reception switching unit 102, a reception radio unit 103, a reception control unit 104, a reception level measurement unit 105, a communication control unit 106, a cell table 107, a cell switching control device 108, and a transmission data generation unit. 109, a transmission control unit 110, and a transmission wireless unit 111. The cell switching control device 108 includes a schedule holding unit 1081, a schedule determining unit 1082, and a cell switching control unit 1083.

  The antenna 101 receives wireless data (signal) from the base station 120, generates a reception signal, and gives the reception signal to the reception wireless unit 103 via the transmission / reception switching unit 102. The antenna 101 receives the data from the transmission wireless unit 111. A transmission signal is received via the transmission / reception switching unit 102 to generate and transmit a wireless transmission signal. The transmission / reception switching unit 102 switches between a transmission signal and a reception signal.

  The reception radio unit 103 receives a reception signal from the antenna 101 via the transmission / reception switching unit 102 and performs radio processing on the reception signal. The reception control unit 104 controls the reception signal. The reception level measuring unit 105 measures the level of the reception signal. The cell table 107 holds MBMS information 1071.

  The communication control unit 106 controls the reception control unit 104 and the transmission control unit 110 to control data transmission / reception. The transmission data generation unit 109 generates transmission data and gives it to the transmission control unit 110. The transmission control unit 110 gives the transmission data from the transmission data generation unit 109 to the transmission wireless unit 111. The transmission radio unit 111 performs radio processing on the transmission data from the transmission control unit 110 to generate a transmission signal, and gives it to the antenna 101 via the transmission / reception switching unit 102. The antenna 101 receives data from the transmission radio unit 111 via the transmission / reception switching unit 102, generates a radio transmission signal, and transmits it to the base station 120.

  The schedule holding unit 1081 holds the transmission schedule of the MBMS information 1071 in the cell table 107. The schedule determination unit 1082 determines the data reception status based on the transmission schedule held by the schedule holding unit 1081 and generates a reception status determination result. The cell switching control unit 1083 controls cell switching based on reception levels of signals from a plurality of cells, MBMS information 1071 in the cell table 107, and reception status determination results from the schedule determination unit 1082.

  Next, the cell switching operation of mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 2 is a flowchart for explaining the cell switching operation of mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention.

  In step S101, the cell switching control unit 108 determines whether or not to switch cells based on the reception levels of signals from a plurality of cells and the MBMS information 1071 in the cell table 107.

  When the cell is switched in step S101, the schedule determination unit 1082 determines the data reception status based on the transmission schedule held by the schedule holding unit 1081, and generates a reception status determination result (step S102).

  Next, the cell switching control unit 1083 determines whether or not to change the cell switching time based on the reception status determination result (step S103).

  When the cell switching control unit 1083 determines in step S103 that the cell switching time is to be changed, the cell switching control unit 1083 changes the cell switching time (step S104) and performs cell switching (step S106). Further, when the cell switching control unit 1083 determines not to change the cell switching time, the cell switching control unit 1083 performs cell switching without changing the cell switching time (step S105).

  Next, the operation of mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention will be specifically described with reference to FIG. 3, FIG. 4, and FIG.

  FIG. 3 is a diagram showing an example of a transmission schedule of data A in mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention. As shown in FIG. 3, it is assumed that the MBMS data A is distributed in the sections T1, T3, and T5, and the MBMS data is not distributed in the sections T2 and T4. This data transmission schedule is held in advance by the schedule holding unit 1081.

  FIG. 4 is a diagram showing that mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention is moving from cell C to cell D. FIG. 5 is a diagram showing the reception levels of signals in cells C and D measured by mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention shown in FIG.

  Here, mobile communication terminal apparatus 100 determines to perform cell switching from cell C to cell D at time t1 in FIG. When the schedule determination unit 1082 determines the transmission schedule of the schedule holding unit 1081, it is determined that the MBMS data A is being received at the current time t1, and that there is a section immediately after the data A is not distributed, and the reception status is determined. Generate results. When the time until MBMS data A is not distributed is shorter than a predetermined time, cell switching control section 1083 determines to perform cell switching in non-distributed section T2. That is, the cell switching control unit 1083 switches cells at time t2 in FIG. Here, the predetermined time is assumed to be predetermined.

  Note that the cell switching control unit 1083 controls the cell switching using the reception level, the reception data, and the MBMS information 1071 of the cell table 107, but predicts the movement of the future reception level from the reception level of the cell so far. Then, cell switching may be determined.

  Here, an example of controlling the cell switching by predicting the movement of the reception level will be described with reference to FIGS. 4, 5, and 6.

  FIG. 6 is a diagram showing another example of the transmission schedule of data A in mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention. As shown in FIG. 6, it is assumed that MBMS data A is distributed in the section T2, and MBMS data is not distributed in the sections T1 and T3.

  Here, at time t0 in FIG. 6, the cell switching control unit 1083 is not in the stage of switching the cell from the cell C to the cell D at this time, but determines the reception level of the signals of the two cells C and D so far. Then, the transition of the reception level of the two cells C and D at the times t1 and t2 in FIG. 5 is predicted (in the future, the reception level of the cell D is predicted to be higher than that of the cell C), and the cells are switched. Is executed (step S101). Here, the cell switching control unit 1083 determines that the cell switching is to be performed at the current time t0 because the data A is distributed at the time t1 at which switching is to be performed, based on the reception status determination result of the schedule determining unit 1082. .

  As described above, according to the first embodiment of the present invention, it is possible to perform cell switching in a section where MBMS data is not distributed, and therefore, loss of MBMS data can be prevented.

  In the example described with reference to FIGS. 3, 4, and 5, the cell switching is performed not at time t <b> 1 but at time t <b> 2 where the switching time is delayed, so that loss of MBMS data can be prevented. .

  In addition, in the example described with reference to FIGS. 4, 5, and 6, cell switching is performed not at time t1, but at time t0 that is earlier than the switching time, and therefore, loss of MBMS data is prevented. Can do.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 2 of the present invention. In the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, the mobile communication system according to Embodiment 2 of the present invention includes mobile communication terminal apparatus 700 and base station 120. The mobile communication terminal apparatus 700 transmits / receives data to / from the base station 120 wirelessly. The base station 120 transmits MBMS data (multicast data) according to a predetermined transmission schedule.

  Mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention includes mobile switching terminal section 7011 instead of cell switching control section 1083 in mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention, and The cell switching control device 701 further includes a data priority determination unit 7012. That is, the cell switching control device 701 includes a schedule holding unit 1081, a schedule determining unit 1082, a cell switching control unit 7011, and a data priority determining unit 7012.

  The data priority determination unit 7012 determines the priority of data based on the MBMS information 1071 of the cell table 107 and generates a priority determination result. The cell switching control unit 7011 is based on reception levels of signals from a plurality of cells, MBMS information 1071 of the cell table 107, reception status determination results from the schedule determination unit 1082, and priority determination results of the data priority determination unit 7012. Controls cell switching.

  Next, the cell switching operation of mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 8 is a flowchart for explaining the cell switching operation of mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention.

  In step S <b> 201, the cell switching control unit 7011 determines whether to perform cell switching based on the reception levels of the signals of a plurality of cells and the MBMS information 1071 of the cell table 107.

  When the cell is switched in step S201, the schedule determination unit 1082 determines the data reception status based on the transmission schedule held by the schedule holding unit 1081, and generates a reception status determination result (step S202).

  Next, the data priority determination unit 7012 determines the priority (step S203). Next, it is determined whether or not to change the cell switching time from the reception status determination result generated by the schedule determination unit 1082 and the priority determination result generated by the data priority determination unit 7012 (step S204).

  When the cell switching control unit 7011 determines to change the cell switching time in step S204, the cell switching control unit 7011 changes the cell switching time (step S205) and performs cell switching (step S207). Further, when the cell switching control unit 7011 determines not to change the cell switching time, the cell switching control unit 7011 performs the cell switching without changing the cell switching time (step S206).

  Next, the operation of mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention will be specifically described with reference to FIG. 4, FIG. 5, FIG. 7, and FIG.

  FIG. 9 is a diagram showing an example of a transmission schedule of data A and B in mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention.

  As shown in FIG. 9, it is assumed that data A is distributed in the sections T1, T3, and T5, and data B is distributed in the sections T2 and T4. This data transmission schedule is held in advance by the schedule holding unit 1081. The data priority at this time is higher for data A than for data B.

  Here, the cell switching control unit 7011 determines to perform cell switching from the cell C to the cell D at time t1 in FIG. The schedule determination unit 1082 determines the schedule, and currently determines that MBMS data A is being received at time t1 and that data B is distributed after data A.

  In addition, the data priority determination unit 7012 determines that the data A and the data B have a higher priority than the data A. Here, the cell switching control unit 7011 determines that the cell switching is performed in the distribution interval T2 of the data B when the data start time of the low priority data B is shorter than the predetermined time. That is, the cell switching control unit 7011 performs cell switching at time t2 in FIG. Here, the predetermined time is assumed to be predetermined.

  Note that the cell switching control unit 7011 controls cell switching using the reception level, reception data, and MBMS information 1071 of the cell table 107, but predicts future movement of the reception level from the reception level of the cell so far. Then, cell switching may be determined.

  As described above, according to the second embodiment of the present invention, it is possible to preferentially switch cells at the time of distribution of low priority data, and therefore it is possible to prevent data with high priority from being lost. .

  In the example described with reference to FIG. 9, since the switching time is changed instead of the time t1 and the cells are switched at the time t2, data loss of the data A having a high priority can be prevented.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to the drawings. FIG. 10 is a block diagram showing a configuration of a mobile communication system provided with a mobile communication terminal apparatus according to Embodiment 3 of the present invention. In the third embodiment of the present invention, the same components as those in the second embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 10, the mobile communication system according to Embodiment 3 of the present invention includes mobile communication terminal apparatus 1000 and base station 120. The mobile communication terminal apparatus 1000 transmits / receives data to / from the base station 120 wirelessly. The base station 120 transmits MBMS data (multicast data) according to a predetermined transmission schedule.

  Mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention is provided with cell switching control section 10011 instead of cell switching control section 7011 in mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention, and The cell switching control device 1001 further includes a threshold control unit 10012. That is, the cell switching control apparatus 1001 includes a schedule holding unit 1081, a schedule determining unit 1082, a data priority determining unit 7012, a cell switching control unit 10011, and a threshold control unit 10012.

  The threshold control unit 10012 controls (changes) the threshold according to the priority of data. The cell switching control unit 10011 performs threshold control according to reception levels of signals from a plurality of cells, MBMS information 1071 of the cell table 107, reception status determination results from the schedule determination unit 1082, and determination results of the data priority determination unit 7012. Switching of cells is controlled based on the threshold value of unit 10012.

  Next, the cell switching operation of mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 11 is a flowchart for explaining the cell switching operation of mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention.

  In step S301, the threshold control unit 10012 controls (changes) the threshold according to the priority of the data.

  Next, the cell switching control unit 10011 periodically determines whether or not to switch cells (step S302). That is, the cell switching control unit 10011 compares the reception level of signals from a plurality of cells with the threshold value of the threshold control unit 10012, the MBMS information 1071 of the cell table 107, and the reception status determination result from the schedule determination unit 1082. Based on the above, it is determined whether or not to switch cells.

  When the cell is switched in step S302, the schedule determining unit 1082 performs cell switching (step S303).

  In addition, although it has been described that the periodic time for controlling the threshold is determined in advance, it may be changed depending on the environment. In addition, the threshold control unit 10012 may be configured to control (change) the threshold according to the priority of data when switching MBMS data.

  Next, the operation of mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention will be specifically described with reference to FIG. 10 and FIG.

  FIG. 12 is a diagram illustrating an example of a transmission schedule of data A and B and an example of a reception level of cell C in mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention. In FIG. 12, line 1 indicates the reception level of cell C.

  Here, an example relating to threshold control performed when the threshold control unit 10012 receives MBMS data will be described.

  Assume that cell switching is performed when the reception level of a signal in a peripheral cell reaches a certain level that is greater than the reception level of a signal in a cell that is currently communicating. In this case, “a certain level” is set as a threshold value.

  Line 2 in FIG. 12 is a threshold when MBMS data is not being received. Considering a case where MBMS data is being received, since the section T1 is a section of data A having a high priority, a larger threshold value is provided as compared with the threshold line 2 when MBMS data is not being received. Therefore, the threshold is raised to line 3.

  Further, since the section T2 is a section of the data B having a low priority, the threshold is lowered to the line 4 in order to provide a smaller threshold compared to the threshold line 2 when MBMS data is not being received.

  FIG. 13 is a diagram illustrating an example of a transmission schedule of data A and B and an example of reception levels of cells C and D in mobile communication terminal apparatus 1000 according to Embodiment 3 of the present invention. FIG. 13 is also a diagram in which the reception level of the signal of cell D is added in FIG. The relationship between the threshold and cell switching will be described using this. Line 2 is the reception level of cell D. Here, the cell switching determination is made periodically.

  The cell switching control unit 10011 determines the size of the threshold value (1) of the cell C and the reception level (2) of the cell D when performing the cell switching determination at the time t1 during the MBMS data reception. It is determined that cell switching is not performed for D. Since the threshold value (3) of the cell C is a section in which data A having a high priority is currently distributed, the threshold value is increased to (1).

  Here, if the MBMS data is not being received, the cell switching control unit 10011 determines the threshold (3) and the reception level (2) of the cell D, and switches to the cell D.

  When cell switching is determined at time t2, the cell switching control unit 10011 determines the size of the threshold value (4) of cell C and the reception level (2) of cell D, and performs cell switching to cell D. Since the threshold value (3) of the cell C is a section in which data B having a low priority is currently distributed, the threshold value is lowered to (4).

  The threshold control unit 10012 generates a priority comparison result by comparing the priority of the data A and the data B with a predetermined priority instead of comparing the priority of the data A and the data B. You may comprise so that a threshold value may be controlled based on a degree comparison result. Further, the threshold control unit 10012 may be configured to change the threshold of a section in which MBMS data is not distributed.

  As described above, according to the third embodiment of the present invention, the timing at which a cell is switched by increasing the threshold value when distributing high-priority data and decreasing the threshold value when distributing low-priority data. Since it is possible to change, it is possible to prevent data with high priority from being lost.

  In the example described with reference to FIG. 13, cell switching is not performed at t <b> 1 in T <b> 1 that is a section of high-priority data A, and cell switching is performed at t <b> 2 in T <b> 2 that is a section of low-priority data B. As a result, it is possible to prevent data A having a high priority from being lost.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 14 is a block diagram showing a configuration of a mobile communication system including the mobile communication terminal apparatus according to Embodiment 4 of the present invention. In the fourth embodiment of the present invention, the same components as those of the second embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 14, the mobile communication system according to Embodiment 4 of the present invention includes mobile communication terminal apparatus 1400 and base station 120. The mobile communication terminal device 1400 transmits and receives data to and from the base station 120 wirelessly. The base station 120 transmits MBMS data (multicast data) according to a predetermined transmission schedule.

  Mobile communication terminal apparatus 1400 according to Embodiment 4 of the present invention includes mobile switching terminal section 14011 instead of cell switching control section 7011 in mobile communication terminal apparatus 700 according to Embodiment 2 of the present invention, and In addition, a user mode setting unit 14012 is provided.

  The user mode setting unit 14012 is for the user to select and input the reception priority mode or the connection priority mode. Here, the reception priority mode is a mode in which the cell switching timing is changed so that MBMS data is not cut. The connection priority mode is a normal cell switching mode in which the cell switching timing is not changed even when MBMS data is distributed.

  Next, cell switching operation of mobile communication terminal apparatus 1400 according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 15 is a flowchart for explaining a cell switching operation of mobile communication terminal apparatus 1400 according to Embodiment 4 of the present invention.

  First, in step S401, the user selects the reception priority mode or the connection priority mode and sets it in the user mode setting unit 14012. Next, cell switching control section 14011 determines whether or not to switch cells based on the reception levels of signals of a plurality of cells and MBMS information 1071 in cell table 107 (step S402).

  When the cell is switched in step S402, the schedule determination unit 1082 determines the data reception status based on the transmission schedule held by the schedule holding unit 1081, and generates a reception status determination result (step S403).

  Next, the cell switching control unit 14011 determines whether or not the reception priority mode is set (step S404). When the reception priority mode is not set in step S404, the cell switching control unit 14011 performs cell switching (step S408).

  In the reception priority mode in step S404, the cell switching control unit 14011 determines the cell switching time based on the reception status determination result generated by the schedule determination unit 1082 and the priority determination result generated by the data priority determination unit 7012. It is determined whether or not to change (step S405).

  When the cell switching control unit 14011 determines to change the cell switching time in step S405, the cell switching control unit 14011 changes the cell switching time (step S406) and performs cell switching (step S408). Further, when the cell switching control unit 14011 determines not to change the cell switching time, the cell switching control unit 14011 performs the cell switching without changing the cell switching time (step S407).

  The fourth embodiment of the present invention can also be applied to the first embodiment of the present invention.

  As described above, according to Embodiment 4 of the present invention, the user selects whether to limit cell switching so that MBMS data is not cut, or to perform cell switching even during delivery of MBMS data as usual. Can be set.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 16 is a block diagram showing a configuration of a mobile communication system provided with a mobile communication terminal apparatus according to Embodiment 5 of the present invention. In the fifth embodiment of the present invention, the same components as those in the second embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 16, the mobile communication system according to Embodiment 5 of the present invention includes mobile communication terminal apparatus 1600 and base station 120. Mobile communication terminal apparatus 1600 transmits and receives data to and from base station 120 wirelessly. The base station 120 transmits MBMS data (multicast data) according to a predetermined transmission schedule.

  Mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention is mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention, and further includes power control signal generation section 1601 and power control signal notification section 1602. Yes.

  The power control signal generation unit 1601 generates a power control signal that gives an instruction to increase the transmission power of transmission data when the cell switching control device 108 performs cell switching, and notifies the power control signal notification unit 1602 for a predetermined time. give. The power control signal notification unit 1602 receives the power control signal from the power control signal generation unit 1601 and transmits the power control signal to the base station 120 via the transmission control unit 110, the transmission radio unit 111, the transmission / reception switching unit 102, and the antenna 101. Is notified.

  The base station 120 increases the transmission power of MBMS data for a predetermined time during which the power control signal from the power control signal notification unit 1602 is received.

  Next, cell switching operation of mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 17 is a flowchart for explaining the cell switching operation of mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention.

  In step S501, the cell switching control unit 108 determines whether or not to perform cell switching based on the reception levels of signals from a plurality of cells and the MBMS information 1071 in the cell table 107.

  When the cell is switched in step S501, the schedule determination unit 1082 determines the data reception status based on the schedule held by the schedule holding unit 1081 and generates a reception status determination result (step S502).

  Next, the cell switching control unit 1083 determines whether or not to change the cell switching time based on the reception status determination result (step S503).

  When the cell switching control unit 1083 determines that the cell switching time is to be changed in step S503, the power control signal generation unit 1601 generates a power control signal when the cell switching control device 108 performs cell switching (step S504). The power control signal notification unit 1602 is given for a predetermined time. The power control signal notification unit 1602 receives the power control signal from the power control signal generation unit 1601 and transmits the power control signal to the base station 120 via the transmission control unit 110, the transmission radio unit 111, the transmission / reception switching unit 102, and the antenna 101. Is notified. In this case, the base station 120 increases the transmission power of the MBMS data only for a predetermined time during which the power control signal from the power control signal notification unit 1602 is received.

  Next, the cell switching control unit 1083 changes the cell switching time (step S505) and performs cell switching (step S507). In addition, when the cell switching control unit 1083 determines that the cell switching time is not changed, the cell switching control unit 1083 performs the cell switching without changing the cell switching time (step S506).

  Next, the operation of mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention will be specifically described with reference to FIG. 16 and FIG. FIG. 18 is a diagram showing signal reception levels of cell C and cell D measured by mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention.

  As illustrated in FIG. 18, when the cell switching control unit 1083 determines to change the switching time, and the cell switching time is changed from time t1 to time t2, the power control signal generation unit 1601 generates a power control signal. Since the base station 120 increases the transmission power of the MBMS data because the power control signal notification unit 1602 notifies the base station 120, the reception level of the MBMS data increases as shown in (1). Can be received without being disconnected until time t2.

  In mobile communication terminal apparatus 1600 according to Embodiment 5 of the present invention, cell switching control section 1083 may be configured to increase the received power of data only for data with high priority.

  As described above, according to the fifth embodiment of the present invention, it is possible to temporarily increase the reception power of MBMS data when performing cell switching, and thus it is possible to prevent the lack of data.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 19 is a block diagram showing a configuration of a mobile communication system including the mobile communication terminal apparatus according to Embodiment 6 of the present invention. In the sixth embodiment of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 19, the mobile communication system according to Embodiment 6 of the present invention includes mobile communication terminal apparatus 1900 and base station 120. Mobile communication terminal apparatus 1900 transmits and receives data to and from base station 120 wirelessly.

  The base station 120 according to Embodiment 6 of the present invention transmits MBMS data (multicast data) according to a predetermined transmission schedule. Further, the base station 120 includes a transmission schedule changing unit 1201. The transmission schedule changing unit 1201 changes the transmission schedule when receiving a transmission schedule change request signal from the mobile communication terminal device 1900.

  Mobile communication terminal apparatus 1900 according to Embodiment 6 of the present invention is further provided with schedule control section 1901 in mobile communication terminal apparatus 100 according to Embodiment 1 of the present invention. The schedule control unit 1901 generates a transmission schedule change request signal when the cell switching control unit 1083 determines that the transmission schedule is changed. A transmission schedule change request signal from the schedule control unit 1901 is transmitted to the transmission schedule change unit 1201 of the base station 120 via the transmission radio unit 111, the transmission / reception switching unit 102 and the antenna 101.

  Next, cell switching operation of mobile communication terminal apparatus 1900 according to Embodiment 6 of the present invention will be described with reference to FIG. FIG. 20 is a flowchart for explaining cell switching operation of mobile communication terminal apparatus 1900 according to Embodiment 6 of the present invention.

  In step S <b> 601, cell switching control section 108 determines whether or not to perform cell switching based on reception levels of signals from a plurality of cells and MBMS information 1071 in cell table 107.

  When the cell is switched in step S601, the schedule determination unit 1082 determines the data reception status based on the transmission schedule held by the schedule holding unit 1081 and generates a reception status determination result (step S602).

  Next, the cell switching control unit 1083 determines whether or not the schedule is changed (step S603). When the transmission schedule is not changed in step S603, the cell switching control unit 1083 determines whether or not to change the cell switching time based on the reception status determination result (step S605).

  When the cell switching control unit 1083 determines that the transmission schedule is changed in step S603, the schedule control unit 1901 generates a transmission schedule change request signal (step S604). The transmission schedule change request signal is transmitted to the transmission schedule change unit 1201 of the base station 120 via the transmission radio unit 111, the transmission / reception switching unit 102, and the antenna 101. The transmission schedule change unit 1201 changes the transmission schedule when receiving a transmission schedule change request signal. The base station 120 transmits the changed transmission schedule to the mobile communication terminal apparatus 1900, and the schedule holding unit 1081 of the mobile communication terminal apparatus 1900 holds the changed transmission schedule. That is, the schedule holding unit 1081 updates the held transmission schedule with the changed transmission schedule.

  The cell switching control unit 1083 determines whether or not to change the cell switching time based on the reception status determination result after the operation of step S604 (step S605).

  When the cell switching control unit 1083 determines to change the cell switching time in step S605, the cell switching control unit 1083 changes the cell switching time (step S606) and performs cell switching (step S608). Further, when the cell switching control unit 1083 determines not to change the cell switching time, the cell switching control unit 1083 performs the cell switching without changing the cell switching time (step S607).

  Next, the operation of mobile communication terminal apparatus 1900 according to Embodiment 6 of the present invention will be specifically described with reference to FIG.

  FIG. 21A is a diagram showing that data A is distributed in section T1, and FIG. 21B is a diagram showing that data A is distributed in sections T2 and T4. is there.

  When there is a cell switching request at time t1 in FIG. 21 (A), the schedule for data A is determined, and when it is determined to change the schedule, a schedule change request signal is transmitted, as shown in FIG. 21 (B). The section T3 is opened at the end and data A is transmitted.

Thereafter, the schedule is judged again, and the time t2 of the section T3 in which the data A is not distributed
To switch the cell.

  In the sixth embodiment of the present invention, mobile communication terminal apparatus 1900 may be configured to change the transmission schedule of all data when a plurality of data is transmitted.

  Thus, according to the sixth embodiment of the present invention, it is possible to prevent the lack of data by providing a section in which MBMS data is not distributed and performing cell switching in the section in which the MBMS data is not distributed.

  The present invention can also be applied when broadcasting data is distributed.

  A mobile communication terminal apparatus according to a first aspect of the present invention is a mobile communication terminal apparatus capable of receiving broadcast or multicast data, and a schedule holding means for holding a transmission schedule of the broadcast or multicast data. A reception level measurement unit that measures a plurality of reception levels of signals of a plurality of adjacent cells and generates a plurality of reception level measurement values; and the reception level measurement value is high by comparing the plurality of reception level measurement values Cell switching control means for controlling to switch the cell at a time when the data is not distributed based on the transmission schedule when switching to the cell is adopted.

  According to this configuration, since cells are switched at a time when broadcast or multicast data is not distributed, data loss can be prevented and broadcast or multicast data can be reliably received.

  A mobile communication terminal apparatus according to a second aspect of the present invention is a mobile communication terminal apparatus capable of receiving broadcast or multicast data, and a schedule holding means for holding a transmission schedule of the broadcast or multicast data. A reception level measuring means for measuring a plurality of reception levels of signals of a plurality of adjacent cells and generating a plurality of reception level measurement values, and determining the priority of the plurality of data based on the transmission schedule and data Based on the transmission schedule and the data priority determination result when switching to the cell having a higher reception level measurement value by comparing the plurality of reception level measurement values with data priority determination means for generating a priority determination result The cell is controlled so as to switch the cell at the time when the data having the low priority is distributed. It adopts a configuration comprising a switching control means.

  According to this configuration, since the cell is switched at the time when the low-priority data of the broadcast or multicast data is distributed, the lack of high-priority data can be prevented. Data that is necessary among the data can be acquired preferentially.

  A mobile communication terminal apparatus according to a third aspect of the present invention is a mobile communication terminal apparatus capable of receiving broadcast or multicast data, and a schedule holding means for holding a transmission schedule of the broadcast or multicast data. A reception level measuring means for measuring a plurality of reception levels of signals from a plurality of adjacent cells to generate a plurality of reception level measurement values, and determining a priority of the plurality of data based on the transmission schedule Data priority determination means for generating a data priority determination result, and threshold control means for controlling the threshold when the priority indicated in the data priority determination result is high to be larger than the threshold when the priority is low And comparing the reception level measurement value and the threshold value when the reception level measurement value is greater than the threshold value. A configuration that includes a cell switching control means for controlling to switch the Le, the.

  According to this configuration, in order to increase the threshold when distributing high-priority data and decrease the threshold when distributing low-priority data, cell switching is performed preferentially when distributing low-priority data. Therefore, it is possible to prevent data with high priority from being lost, and thus necessary information can be acquired.

  The mobile communication terminal apparatus according to a fourth aspect of the present invention is the reception priority mode in which the cell switching timing is changed so that the data is not cut in the first aspect or the second aspect of the present invention, or A configuration is provided that includes user setting means for setting a connection priority mode that does not change the cell switching timing even when data is distributed.

  According to this configuration, in addition to the effects of the first aspect or the second aspect of the present invention, the user can change the cell switching timing so that the data is not cut, or the data is distributed. It is possible to set a connection priority mode that does not change the cell switching timing even when the cell is switched.

  The mobile communication system according to the fifth aspect of the present invention may receive a base station that transmits broadcast or multicast data according to a predetermined transmission schedule, and the broadcast or multicast data transmitted from the base station. A mobile communication terminal device, wherein the mobile communication terminal device holds schedule transmission means for holding a transmission schedule of the broadcast or multicast data, and receives a plurality of signals from a plurality of adjacent cells. A reception level measuring means for measuring a level and generating a plurality of reception level measurement values, and comparing the plurality of reception level measurement values and switching to the cell having a higher reception level measurement value based on the transmission schedule; A cell that controls to switch the cell when the data is not distributed Switching control means, and the cell switching control means generates a power control signal that gives an instruction to increase transmission power of transmission data when switching cells, and notifies the base station of the power A control signal notification unit is provided, and the base station includes a unit for increasing the transmission power of the transmission data for a predetermined time when receiving the power control signal.

  According to this configuration, since the cell is switched at a time when the broadcast or multicast data is not distributed, the loss of data can be prevented and the broadcast or multicast data can be reliably received, and the cell can be switched. Since the transmission power of data can be temporarily increased at the time of performing data, data loss can be prevented.

  A mobile communication system according to a sixth aspect of the present invention may receive a base station that transmits broadcast or multicast data according to a predetermined transmission schedule, and the broadcast or multicast data transmitted from the base station. A mobile communication terminal device, wherein the mobile communication terminal device generates a transmission schedule change request signal for changing the transmission schedule of the data and transmits the transmission schedule change request signal to the base station Comprising a request means, wherein the base station comprises a transmission schedule change means for changing the transmission schedule when the transmission schedule change request signal is received, and the mobile communication terminal device is configured to transmit the broadcast or multicast data. Schedule holding means for holding the transmission schedule and adjacent multiple A reception level measuring means for measuring a plurality of reception levels of a signal from a cell and generating a plurality of reception level measurement values; and comparing the plurality of reception level measurement values to the cell having a high reception level measurement value. It adopts a configuration comprising cell switching control means for controlling to switch the cell at a time when the data is not distributed based on the transmission schedule at the time of switching.

  According to this configuration, since the broadcast or multicast data transmission schedule can be changed, the cell is switched at a time when the broadcast or multicast data is not distributed. Can be received reliably.

  A mobile communication method according to a seventh aspect of the present invention is a mobile communication method in a mobile communication system comprising a mobile communication terminal device capable of receiving broadcast or multicast data, the broadcast or multicast A schedule holding step for holding a data transmission schedule, a reception level measuring step for measuring a plurality of reception levels of signals of a plurality of adjacent cells to generate a plurality of reception level measurements, and the plurality of reception level measurements A cell switching control step for performing control so as to switch the cell at a time when the data is not distributed based on the transmission schedule when the value is compared to switch to the cell having a high reception level measurement value. I did it.

  According to this method, since cells are switched at a time when broadcast or multicast data is not distributed, data loss can be prevented and broadcast or multicast data can be reliably received.

  In the mobile communication method according to the eighth aspect of the present invention, a base station that transmits broadcast or multicast data according to a predetermined transmission schedule, and the broadcast or multicast data transmitted from the base station may be received. A mobile communication method in a mobile communication system comprising: a mobile communication terminal apparatus, wherein the mobile communication terminal apparatus holds a schedule for transmitting the broadcast or multicast data; and the mobile communication terminal apparatus Measuring a plurality of reception levels of signals of a plurality of adjacent cells to generate a plurality of reception level measurement values, and comparing the plurality of reception level measurement values with a high reception level measurement value The data is not distributed based on the transmission schedule when switching to the cell. A cell switching control step for controlling the mobile communication terminal apparatus to switch the cell at a time, and a power control signal for giving an instruction to increase transmission power of transmission data when the cell switching control means performs cell switching Generating a power control signal for informing the base station and increasing the transmission power of the transmission data for a predetermined time when the base station receives the power control signal. I made it.

  According to this method, since the cell is switched at a time when the broadcast or multicast data is not distributed, the loss of data can be prevented, and the broadcast or multicast data can be reliably received. Since the transmission power of data can be temporarily increased at the time of performing, the loss of data can be prevented.

  Since the present invention switches cells at a time when broadcast or multicast data is not distributed, it has the effect of preventing data loss and reliably receiving broadcast or multicast data. It is useful for a mobile communication terminal apparatus and a mobile communication system corresponding to the distribution of data.

The block diagram which shows the structure of the mobile communication system which comprises the mobile communication terminal device in the 1st Embodiment of this invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 1 of the present invention. The figure which shows an example of the transmission schedule of the data A in the mobile communication terminal device which concerns on Embodiment 1 of this invention. The figure which shows that the mobile communication terminal device which concerns on Embodiment 1 of this invention is moving from the cell C to the cell D The figure which shows the reception level of the signal of the cell C and the cell D which the mobile communication terminal device which concerns on Embodiment 1 of this invention shown in FIG. 4 measures The figure which shows the other example of the transmission schedule of the data A in the mobile communication terminal device which concerns on Embodiment 1 of this invention. FIG. 2 is a block diagram showing a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 2 of the present invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 2 of the present invention. The figure which shows an example of the transmission schedule of the data A and B in the mobile communication terminal device which concerns on Embodiment 2 of this invention. FIG. 3 is a block diagram showing a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 3 of the present invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 3 of the present invention. The figure which shows an example of the transmission schedule of data A and B in the mobile communication terminal device which concerns on Embodiment 3 of this invention, and an example of the reception level of the cell C The figure which shows an example of the transmission schedule of data A and B in the mobile communication terminal device which concerns on Embodiment 3 of this invention, and an example of the reception level of the cells C and D Block diagram showing a configuration of a mobile communication system provided with a mobile communication terminal apparatus according to Embodiment 4 of the present invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 4 of the present invention. Block diagram showing a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 5 of the present invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 5 of the present invention. The figure which shows the reception level of the signal of the cell C and the cell D which the mobile communication terminal device which concerns on Embodiment 5 of this invention is measuring. Block diagram showing a configuration of a mobile communication system including a mobile communication terminal apparatus according to Embodiment 6 of the present invention. Flow chart for explaining cell switching operation of mobile communication terminal apparatus according to Embodiment 6 of the present invention. (A) is a diagram showing that data A is distributed in the section T1, and (B) is a diagram showing that data A is distributed in the sections T2 and T4. A block diagram showing a configuration of a mobile communication system including a conventional mobile communication terminal device The figure for demonstrating the mode of reception and cell switching of MBMS data in the conventional mobile communication terminal device

Explanation of symbols

100, 700, 1000, 1400, 1600, 1900 Mobile communication terminal device 120 Base station 101 Antenna 102 Transmission / reception switching unit 103 Reception radio unit 104 Reception control unit 105 Reception level measurement unit 106 Communication control unit 107 Cell table 108, 701, 1001, 1401 Cell switching control device 109 Transmission data generation unit 110 Transmission control unit 111 Transmission radio unit 1081 Schedule holding unit 1082 Schedule determination unit 1083, 7011, 10011, 14011 Cell switching control unit 7012 Data priority determination unit 10012 Threshold control unit 14012 User mode Setting unit 1601 Power control signal generation unit 1602 Power control signal notification unit 1901 Schedule control unit

Claims (8)

A mobile communication terminal device capable of receiving broadcast or multicast data,
Schedule holding means for holding a transmission schedule of the broadcast or multicast data;
Reception level measuring means for measuring a plurality of reception levels of signals of a plurality of adjacent cells and generating a plurality of reception level measurements;
Cell switching control for controlling the cells to be switched at a time when the data is not distributed based on the transmission schedule when the plurality of reception level measurement values are compared to switch to the cell having the higher reception level measurement value. Means,
A mobile communication terminal apparatus comprising: A mobile communication terminal device capable of receiving broadcast or multicast data,
Schedule holding means for holding a transmission schedule of the broadcast or multicast data;
Reception level measuring means for measuring a plurality of reception levels of signals of a plurality of adjacent cells and generating a plurality of reception level measurements;
Data priority determination means for determining a priority of the plurality of data based on the transmission schedule and generating a data priority determination result;
The time during which the data with the low priority is distributed based on the transmission schedule and the data priority determination result when switching to the cell with the high reception level measurement value by comparing the plurality of reception level measurement values Cell switching control means for controlling to switch the cell to
A mobile communication terminal apparatus comprising: A mobile communication terminal device capable of receiving broadcast or multicast data,
Schedule holding means for holding a transmission schedule of the broadcast or multicast data;
Reception level measuring means for measuring a plurality of reception levels of signals from a plurality of adjacent cells and generating a plurality of reception level measurements;
Data priority determination means for determining a priority of the plurality of data based on the transmission schedule and generating a data priority determination result;
Threshold control means for controlling the threshold when the priority shown in the data priority determination result is high to be larger than the threshold when the priority is low;
Cell switching control means for comparing the reception level measurement value with the threshold value and controlling the cell to be switched when the reception level measurement value is greater than the threshold value;
A mobile communication terminal apparatus comprising:   User reception means for setting a reception priority mode for changing the timing for switching cells so that the data is not cut, or a connection priority mode for changing the timing for switching cells even when the data is distributed. The mobile communication terminal device according to claim 1 or 2. In a mobile communication system comprising: a base station that transmits broadcast or multicast data according to a predetermined transmission schedule; and a mobile communication terminal device that can receive the broadcast or multicast data transmitted from the base station.
The mobile communication terminal device
Schedule holding means for holding a transmission schedule of the broadcast or multicast data;
Reception level measuring means for measuring a plurality of reception levels of signals of a plurality of adjacent cells and generating a plurality of reception level measurements;
Cell switching control for controlling the cells to be switched at a time when the data is not distributed based on the transmission schedule when the plurality of reception level measurement values are compared to switch to the cell having the higher reception level measurement value. Means,
The cell switching control means includes a power control signal notifying means for generating a power control signal for instructing to increase transmission power of transmission data when switching cells and notifying the base station,
The mobile communication system, wherein the base station comprises means for increasing the transmission power of the transmission data for a predetermined time when receiving the power control signal. In a communication system comprising: a base station that transmits broadcast or multicast data according to a predetermined transmission schedule; and a mobile communication terminal that can receive the broadcast or multicast data transmitted from the base station.
The mobile communication terminal device includes a transmission schedule change request means for generating a transmission schedule change request signal for changing the transmission schedule of the data and transmitting the signal to the base station,
The base station comprises transmission schedule change means for changing the transmission schedule when receiving the transmission schedule change request signal,
The mobile communication terminal device
Schedule holding means for holding the transmission schedule of the broadcast or multicast data;
Reception level measuring means for measuring a plurality of reception levels of signals from a plurality of adjacent cells and generating a plurality of reception level measurements;
Cell switching control for controlling the cells to be switched at a time when the data is not distributed based on the transmission schedule when the plurality of reception level measurement values are compared to switch to the cell having the higher reception level measurement value. Means,
A mobile communication system comprising: A mobile communication method in a mobile communication system comprising a mobile communication terminal device capable of receiving broadcast or multicast data,
A schedule holding step for holding a transmission schedule of the broadcast or multicast data;
A reception level measurement step of measuring a plurality of reception levels of signals of a plurality of adjacent cells to generate a plurality of reception level measurements;
Cell switching control for controlling the cells to be switched at a time when the data is not distributed based on the transmission schedule when the plurality of reception level measurement values are compared to switch to the cell having the higher reception level measurement value. Steps,
A mobile communication method comprising: Movement in a mobile communication system comprising: a base station that transmits broadcast or multicast data according to a predetermined transmission schedule; and a mobile communication terminal device that can receive the broadcast or multicast data transmitted from the base station A body communication method,
A schedule holding step in which the mobile communication terminal device holds a transmission schedule of the broadcast or multicast data; and
A reception level measuring step in which the mobile communication terminal apparatus measures a plurality of reception levels of signals of a plurality of adjacent cells to generate a plurality of reception level measurement values;
The mobile communication terminal apparatus switches the cell at a time when the data is not distributed based on the transmission schedule when the plurality of reception level measurement values are compared to switch to the cell having the higher reception level measurement value. A cell switching control step for controlling
A power control signal notifying step for generating a power control signal for instructing to increase transmission power of transmission data when the cell switching control means performs cell switching, and notifying the base station;
Increasing the transmission power of the transmission data by a predetermined time when the base station receives the power control signal;
A mobile communication method comprising:

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