JP2002369247A - Base station, portable communication terminal equipment, portable communication system and method for communication using portable equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station, capable of optimally time allocating in response to a down data reproducing state of a terminal equipment side, when outgoing data is transmitted to the equipment by a time division multiplex, and to provide portable communication terminal equipment, a portable communication system and a method for communicating by portable equipment. SOLUTION: The base station is a base station of the portable communication system, adopting a data communication system for communicating data at a predicted down data communicating speed, by predicting the outgoing data communicating speed at a terminal equipment side, based on a receiving state of a signal from the base station 30 at terminal equipment A, B and informing the predicted outgoing data communication rate (DRC) to the base station. The base station comprises a terminal information receiving means for receiving outgoing data execution information (counter value) at the terminal equipment informed form the equipment, a transmitting means for transmitting the data through time division multiplex, and a terminal equipment deciding means for deciding the equipment for transmitting, at each dividing times T1 to T6 of the time division multiplex, based on the received outgoing data execution information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station, a mobile communication terminal, a mobile communication system, and a mobile communication system employing a method of performing data communication at a downlink data communication rate predicted by a terminal. The present invention relates to a mobile communication method.

[0002]

2. Description of the Related Art In recent years, as a next-generation high-speed wireless communication system,
cdma2000 1x-EV DO method has been developed. Cdma200 above
0 1x-EV DO system is a standardized version of the HDR (High Data Rate) system, which is an extension of cdma2000 1x by Qualcomm, and is based on Std.T-64 1S-2000 by ARIB.
CS0024 “cdma2000 High Rate Packet Data Air Inte
rface Specification ", which is currently being serviced by KDDI in Japan. The cdmaOne method (ARIB T-53 in Japan, EIA / TIA / IS-95 in North America, Korea, etc.)
Etc.) and expanded to support 3rd generation (3G) cdma
This is a method aimed at improving the communication speed by further specializing the 2000 1x method to data communication. Cdma2000 l
In x-EV DO, EV stands for Evolution, and DO stands for Data only.

[0003] In the cdma2000 1x-EV DO system, a modulation scheme of data transmitted from a base station to a portable communication terminal (hereinafter, abbreviated to "terminal" as appropriate) based on information for notifying a reception state received from the terminal. When the reception state of the terminal is good, it is possible to use a communication rate with low error resilience but high speed when the reception state of the terminal is good, and a communication rate with low error resistance but high error resilience when the reception state is bad. In this system, the downlink data communication speed is not simply determined by the instantaneous value of CIR (carrier-to-interference ratio) indicating the reception state as in the conventional cdmaOne system, but is used for prediction or past downlink data transmission. It changes due to correction by statistical data such as an error rate. That is, in the CDMA, which is a communication system that is currently widely used, since the change in data communication speed depending on the location is not so remarkable as in the cdma2000 1x-EV DO system, the judgment of the reception state and the like is also received from the base station. This was performed based on instantaneous values such as Ec / Io (pilot signal strength versus total received signal strength) obtained from the pilot signal and CIR.

On the other hand, the cdma2000 1x-EV DO system directly shows an extremely accurate data communication rate obtained in consideration of prediction and correction based on statistical data such as an error rate of past downlink data transmission. Estimated downlink data communication speed (D
The terminal side is provided with a RC (Data Rate Control Bit) as a table, and based on this table, the terminal notifies the base station of the predicted downlink data communication speed. Thus, data communication at the various communication rates described above is performed.

In the cdma2000 1x-EV DO system, in the downlink direction (direction from the base station to the mobile communication terminal), the time is set to 1/60.
It divides into 0 seconds (hereinafter referred to as “division time” or “slot”), communicates with only one mobile communication terminal within that time, and switches the mobile communication terminal of the other Time division multiple access (TDMA) for communicating with mobile communication terminals
lex access). Thus, data transmission can be always performed with the maximum power to each mobile communication terminal, and data communication performed between the mobile communication terminals can be performed at the highest communication speed.

In this time-division multiplexing access, the base station usually determines (schedules) a mobile communication terminal that performs communication for each slot as follows. FIG. 9 illustrates an example in which the base station 300 transmits downlink data to the mobile communication terminals X and Y, and time-division multiplexes data to the mobile communication terminal X at times T10 and T12 and to the mobile communication terminal Y at times T11 and T13. It is assumed to be transmitted. Here, the communication rate of the downlink data is determined based on the DRC transmitted from each of the terminals X and Y.
It is assumed that both DRCs are equal between 13.

When such an assumption is made, the time change of the assignment of each terminal to each slot is as shown in FIG. In this figure, base station 300 determines a terminal to be assigned to each slot by the following equation. DRC / R (Ave) (1) Here, R (Ave) indicates an average value of data communication rates received by each terminal in the latest 1000 slots. For example, at time T10, the base station 10 determines, based on the DRC and R (Ave) transmitted from the terminals X and Y,
The value based on Equation 1 is calculated for each terminal, and the downlink data is transmitted to the terminal having the larger value at time T10. For example, T
When data is transmitted to the terminal X at 10, the time T of the terminal Y
Since the data communication rate at 10 becomes 0, the R (Ave) of the terminal Y decreases accordingly. In other words, at the next allocation time T11, the value according to Equation 1 is larger for terminal Y than for terminal X, so at T11, a slot is allocated to terminal Y and downlink data is transmitted. In this way, slots are alternately (1: 1) assigned to terminals X and Y between times T10 and T13, and the amount of data to be transmitted is equal for each terminal.

[0008] By allocating terminals to each slot in the above manner, downlink data can be transmitted fairly to each terminal connected to the base station, and the problem of one terminal occupying the base station can be prevented. You.

[0009]

However, when terminals are assigned to the respective slots by the above-described method, it is not always convenient for a user having the terminals. In other words, on the terminal side, a predetermined application is activated to reproduce the downlink data,
For example, when a plurality of applications are started up on the terminal X and a plurality of different downlink data are to be reproduced at the same time, the amount of downlink data downloaded from the base station increases accordingly. On the other hand, when one application is started on the terminal Y and it is desired to reproduce only one downlink data, the amount of downlink data may be small.

[0010] However, in the above-mentioned conventional technology, it is impossible to perform data transmission reflecting such a downlink data reproduction state for each terminal. For example, as shown in FIG. 10, when the DRCs of the terminals X and Y are equal, the amount of data to be transmitted is the same for both, so that the optimal slot allocation (scheduling) can be performed according to the state of the terminal. You can't.

The present invention has been made in view of such circumstances, and when transmitting downlink data to a terminal by time division multiplexing, it is possible to perform optimal time allocation according to the downlink data reproduction state on the terminal side. An object of the present invention is to provide a base station, a mobile communication terminal, a mobile communication system, and a mobile communication method that can be used.

[0012]

In order to achieve the above object, a base station according to the present invention predicts a downlink data communication speed on the terminal side based on a reception state of a signal from the base station in the terminal, and performs the prediction. By notifying the downlink data communication rate to the base station, the base station is a base station of a mobile communication system that employs a data communication method of communicating data at the predicted downlink data communication rate, and is notified from the terminal. Terminal information receiving means for receiving downlink data execution information at the terminal; transmitting means for transmitting the data by time division multiplexing to each terminal; and the time division based on the received downlink data execution information. Terminal determining means for determining a terminal that performs transmission for each division time in multiplexing. With this configuration, the terminal transmitting the downlink data from the base station for each divided time can be appropriately assigned according to the downlink data execution information (the activation state of the application or the like) in each terminal, and the downlink data is executed. The convenience on the terminal side increases.

[0013] The terminal determining means is configured to multiply a predetermined determination value by a coefficient based on the downlink data execution information,
Preferably, the terminal is determined. In this way, if the downlink data execution information is 0 (the end of the application, etc.), the downlink data is not transmitted to the terminal in the next division time, so transmission is performed for each division time. Terminals can be assigned more appropriately.

The portable communication terminal of the present invention adopts the data communication system, and when the base station transmits the data to each terminal by time-division multiplexing, the mobile communication terminal receives the notification from the terminal. Based on the downlink data execution information,
For use in a mobile communication system that determines a terminal that performs transmission for each divided time in the time-division multiplexing, terminal information obtaining means for obtaining the downlink data execution information in the mobile communication terminal, and the obtained downlink data execution information Terminal information transmitting means for transmitting to the base station.

[0015] It is preferable that the terminal information acquisition means acquires an activation state of an application that executes downlink data in the portable communication terminal.

The portable communication terminal of the present invention further comprises a predetermined counter and counter control means, wherein the application includes an instruction to add the counter at the time of startup and to subtract the counter at the time of termination, and The control means adjusts the value of the counter according to the instruction, and the terminal information obtaining means obtains the numerical value of the counter.

[0017] A portable communication system according to the present invention includes the base station and an exchange for managing the base station.

The portable communication method according to the present invention adopts the data communication method, receives downlink data execution information at the terminal notified from the terminal, and transmits the data to each terminal by time division multiplexing. And a step of determining a terminal that performs transmission for each division time in the time division multiplexing based on the received downlink data execution information.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show block diagrams of a mobile communication system and a base station of the present invention, respectively.

In FIG. 1, a portable communication system 50 includes:
.. And a switching station 40 that manages each base station. The mobile communication system 50 is connected to a network 80 such as the Internet or a public network via the exchange 40, and is connected to another mobile communication system (carrier) 60, a server 70 for storing downstream data (content) described later, and the like. You can exchange information with Each base station 30, 30A, 30B
Are assigned a zone for performing wireless communication with the mobile communication terminals A, B, etc., and the exchange 40 performs a switching process to a corresponding base station every time the mobile communication terminal moves and changes the zone. It has become.

As shown in FIG. 2, the base station 30
An antenna 31 for transmitting and receiving to and from a mobile communication terminal, a wireless communication unit (terminal information receiving unit, transmitting unit) 33, a control unit (terminal determining unit) 35, a communication history database 37, and exchange of information with an exchange via a predetermined line. (I / F) 39 for the operation.

The radio communication unit 33 converts the frequency of the signal received from the antenna 31 into a signal frequency used inside the base station, demodulates the signal with a predetermined demodulator, and then time division multiplex access (TDMA). ) Reception control according to the method is performed. Also, the antenna 31
On the other hand, when transmitting from Tx, the signal is multiplexed according to TDMA, modulated by a predetermined modulator, and then converted to a transmission frequency. Based on the downlink data execution information from the terminal received by the wireless communication unit 33 and the information stored in the communication history database 37, the control unit 35 determines a terminal that transmits downlink data in each slot according to a procedure described later in detail. decide. The communication history database 37 stores the transmission history of the data from the base station 30, more specifically, the terminal assigned to each slot and the data communication rate at that time.

FIG. 3 is a diagram showing a configuration example of a portable communication terminal used in the portable communication system of the present invention employing the cdma2000 1x-EV DO system. The mobile communication terminal includes an RF unit including an antenna 1, a duplexer 3, a demodulator 5, and a modulator 19;
Decoder 7, predictor 11, CI for storing a table described later
R-DRC converter 13, multiplexer (MUX; Mult)
iplexer) 15, a baseband processing unit and a CPU
(Terminal information acquisition means, terminal information transmission means) 9, a memory 21 for storing various information including an application 21a to be described later, a counter 22 for counting the activation state of the application as a numerical value, a display unit 23 such as a liquid crystal display, a keypad And an operation unit 25 such as a keyboard. In addition, an external interface (for example, a serial port, a parallel port, a USB, a blue-tooth, an infrared communication, and a 10-bit interface) with a personal computer (PC) 29 is used so that the portable communication terminal can be used as a wireless modem.
(se-T LAN etc.) 27.

<< Outline of Operation of Portable Communication Terminal Using cdma2000 1x-EV DO System >> Next, an outline of operation of the cdma2000 1x-EV DO system for the portable communication terminal having the above configuration will be described. The downlink pilot signal from the base station received by the mobile communication terminal is demodulated by the demodulator 5 via the antenna 1 and the duplexer 3. At this time, the demodulator 5
Demodulates a multiplexed signal from a baseband received signal by a demodulation method corresponding to the modulation method of the received signal received from the base station. In this embodiment, Q
PSK (quadriphase phase shift keying), 8PSK
(8 phase shift keying), 16QAM (16 amplit
ude modulation).

The received data demodulated by the demodulator 5 is output to the decoder 7 and decoded by the decoder 7. That is, the spectrum-spread received multiplexed signal is spectrum-spread. Here, if there is received data (for example, a call signal from a call partner or data that is desired to be downloaded) assigned to the own station, the received data is output from the decoder 7 to the CPU 9. This received data is processed in the CPU 9 or
External P via U9 and external interface 27
It is sent to C etc. 29. Further, in the course of the decoding process, the decoder 7 calculates Ec / Io (pilot signal strength vs. total received signal strength) and calculates CIR (carrier to interference ratio) based on the following equation (2). CIR = (Ec / lo) / (1-Ec / lo) (2)

The CIR determined based on the above equation is
The signal is output from the decoder 7 to the predictor 11, where the next reception slot timing (here, one slot is
The value of CIR at 1.66 ms = 1/600 second) is predicted. The method of prediction here is not particularly limited, but a method such as linear prediction is exemplified. In addition, the predictor 1
Information indicating how many CIRs should be predicted after 1 is included in various control signals transmitted from the base station when the power of the mobile communication terminal is turned on. Then, the predicted CIR obtained by the predictor 11 is output to the subsequent CIR-DRC converter 13.

The CIR-DRC conversion unit 13 has a (CIR-DRC conversion) table shown in FIG. 4, and converts the predicted CIR into a DRC based on this table. This DR
C is the highest communication speed expected from the predicted CIR and receivable by the portable communication terminal at a predetermined error rate or less. Here, as shown in FIG. 4, the DRC corresponding to the reference CIR is defined in the CIR-DRC conversion table. When the input predicted CIR is the reference CIR, the CIR-DRC conversion unit 13 outputs a DRC corresponding to the reference CIR to the CPU 9. On the other hand, predictor 1
If the input predicted CIR is not the reference CIR, the DRC corresponding to the reference CIR closest to the input predicted CIR is obtained, or the input predicted CIR is obtained.
By interpolating from the binary CIR closest to the IR,
The DRC corresponding to the interpolated CIR is obtained. As a result, it is possible to acquire a DRC corresponding to each predicted CIR, and it is possible to notify the base station of a more accurate reception state.

The DRC obtained as described above is CI
Output from the R-DRC converter 13 to the CPU 9. DR
When C is input, the CPU 9 determines whether there is transmission data generated in the mobile communication terminal or input from an external PC or the like 29 via the external interface 27. Then, when there is transmission data, the CPU 9 outputs the transmission data to the multiplexer 15 together with the DRC described above. On the other hand, when there is no transmission data, the DRC input from the CIR-DRC converter 13 is converted to a multiplexer (MUX; Multiplexer) 1.
Output to 5

The DRC and transmission data output from the CPU 9 are multiplexed by the multiplexer 15, further encoded by the encoder 17, modulated by the modulator 19 by a specific modulation method (for example, QPSK), and 3 and transmitted to the base station via the antenna 1.
The base station determines, based on the DRC received from each mobile communication terminal, to which mobile communication terminal the next slot will be used for transmission, and the communication speed (and modulation scheme) for the transmission.

<< Embodiment >> Next, an operation between a base station (mobile communication system) and a mobile communication terminal according to an embodiment of the present invention will be described with reference to FIG.

In the figure, first, on the portable communication terminal side, the CPU 9 activates the application 1 based on an input operation from the user (step S100). In addition,
The applications in the following description are all software for executing (reproducing, etc.) the downlink data received from the base station (mobile communication system). Further, the application includes an instruction to add 1 to the counter at the time of startup, and the CPU 9 executes the counter 2 according to the instruction.
1 is added to 2 (step S110). Next, CPU
9 transmits the value of the counter 22 to the base station at a predetermined timing (step S120). Although the transmission timing is arbitrary, for example, the transmission may be performed at the same time as the transmission of the DRC, that is, the uplink control channel may be used. In the same manner as described above, the transmission procedure may be transmitted to the base station via the multiplexer 15, the encoder 17, the modulator 19, the duplexer 3, and the antenna 1.

On the other hand, the base station allocates slots based on the counter value received in step S120 (step S200). Here, the base station determines a terminal to be assigned to each slot by the following equation. α × DRC / R (Ave) (3) Here, R (Ave) indicates the average value of the data communication rates received by each terminal in the latest 1000 slots. However, if the number is less than 1000 slots, the accumulated value of the past communication rate of the terminal is shown. Α is the counter value transmitted by the mobile communication terminal in step S120. Then, the base station calculates a value according to Equation 3 for each terminal based on α, DRC, and R (Ave) transmitted from each mobile communication terminal, and allocates a slot to the terminal having the largest value (scheduling). , And transmits downlink data (step S210). In this way, slots can be appropriately allocated according to the activation state (the number of tasks) of the application in each mobile communication terminal.

The mobile communication terminal to which the slot has been assigned in step S210 receives the downlink data (step S210).
130). When the reception of the downlink data is completed (step S140), the CPU 9 receives the instruction based on the user's instruction.
Terminates application 1 (step S15).
0). Here, the application includes an instruction to subtract 1 from the counter at the time of termination, and the CPU 9 subtracts 1 from the counter 22 according to the instruction (step S).
160). Next, the CPU 9 transmits the value of the counter 22 to the base station at a predetermined timing (step S170).

Then, the base station allocates a slot based on the counter value received in step S170 (step S220). As described above, when the application is terminated in the portable communication terminal, the slot assignment is changed based on the state (the number of tasks), so that the slot allocation to each terminal becomes more appropriate.

Next, the manner in which the base station allocates slots to a plurality of portable communication terminals will be described with reference to FIGS. Here, as shown in FIG.
A case where downlink data is transmitted to two mobile communication terminals A and B will be considered. In addition, the mobile communication terminal A executes the application 2
And transmits the counter value 2 to the base station 30,
It is assumed that the mobile communication terminal B has activated one application and has transmitted the counter value 1 to the base station 30.
Then, according to these counter values, time T10, T10
At 2, T4 and T5, the mobile communication terminal A sends the time T3 and T6
It is assumed that data is transmitted to the mobile communication terminal B by time division multiplexing. Here, the communication rate of downlink data is determined based on the DRC transmitted from each terminal.
It is assumed that both DRCs are equal between T6.

When such an assumption is made, the time change of the assignment of each terminal A, B to each slot is as shown in FIG. The method by which the base station 30 allocates each slot is performed based on Equation 3 as described above. As a result, at time T1, the value of equation 3 is twice as large for terminal A as for terminal B, so that a slot is allocated to terminal A at T1. The same applies to T2. If the downlink data is continuously transmitted to the terminal A preferentially in this manner,
R (Ave) of terminal A increases. That is, since the value of Expression 3 is smaller for terminal A than for terminal B, a slot is allocated to terminal B at the next time T3, and downlink data is transmitted. Hereinafter, similarly, at time T4,
At T5, a slot is assigned to terminal A, and at T6, a slot is assigned to terminal B. In this way, between times T1 and T6, the ratio of the assigned slots between terminal A and terminal B is approximately 2: 1 and the amount of data to be transmitted is also approximately 2: 1. In addition,
If the DRCs of the terminals are not equal, the ratio of the assigned slots reflects the value of each DRC and deviates from the above 2: 1.

Next, a change in the number of allocated slots in the case where the number of activated applications is increased or decreased in the portable communication terminal will be described with reference to FIG.

In this figure, the processing contents of the portable communication terminal and the base station are the same as those in FIG. First, when no application is running, the counter is not adjusted, and the counter value becomes zero. Then, the terminal transmits the value 0 to the base station, and the base station determines the terminal to be assigned to the slot based on the above equation (3). In this case, for this terminal, the value according to Equation 3 is 0.
Therefore, another terminal is allocated to the slot.

Next, when the terminal activates the application 1, 1 is added to the counter, and the counter value becomes 1. Then, the terminal transmits the value 1 to the base station, and the base station determines the terminal to be assigned to the slot based on Equation (3). Further, when the terminal activates the application 2, 1 is added to the counter, and the counter value becomes 2.
Then, the terminal transmits the value 2 to the base station, and the base station determines the terminal to be assigned to the next slot based on the above equation (3).

When the terminal terminates the application 2, 1 is subtracted from the counter, and the counter value becomes 1. Then, the terminal transmits the value 1 to the base station, and the base station determines a terminal to be allocated to a slot thereafter based on Equation (3). Further, when the terminal terminates the application 1, 1 is subtracted from the counter, and the counter value becomes 0.
Becomes Then, the terminal transmits the value 0 to the base station. In this case, for this terminal, the value according to Equation 3 is 0, so that another terminal is allocated to the slot.

As described above, the number of downlink channel slots required by the terminal side also changes according to the activation state of the application. As described above, the activation state of the application is notified to the base station as a count value, and Since the terminal to which a slot is assigned is determined based on the value, appropriate slot allocation can be performed according to the activation state of the application. Note that the case where a plurality of applications are started means, for example, starting e-mail and a WWW browser, sending and receiving e-mail while browsing a downloaded Web page, or starting music playback software and image playback software. And listening to music while watching the downloaded image.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes a design and the like without departing from the gist of the present invention. It is.

For example, in each of the above embodiments, the counter is incremented or decremented by one in response to the activation or termination of one application, but the increment or decrement may be changed according to the application. For example, in the case of streaming playback software having a large amount of downstream data, the counter is incremented or decremented by 2.5, and in the case of e-mail software having a small amount of downstream data,
The counter may be incremented or decremented by one.

Also, the start and end of the application have been exemplified as the downlink data execution information, but the present invention is not limited to this.
For example, the user may determine the magnitude of the amount of downlink data, input a numerical value or a rank value (such as “large data amount”) from the mobile communication terminal, and transmit the value to the base station as downlink data execution information. Furthermore, the method of determining a terminal to which a slot is to be assigned in the base station is not limited to the above, and the point is that any method may be used as long as it reflects downlink data execution information in slot assignment. For example, downlink data execution information (count value, etc.) of terminals C and D accessing the base station
Are 3 and 1, respectively, the slots are simply allocated according to the values, that is, the ratio of the number of allocated slots between the terminals C and D may be set to 3: 1.

In the above embodiment, the normal cdma
In the 2000 1x-EV DO, a decision formula (Formula 1) used when deciding a terminal to be assigned to each slot in the TDMA scheme is:
By multiplying the downlink data execution information (count value) (Equation 3),
Although the slot assignment is performed, the determination formula is not limited to the formula 1.

As the portable communication terminal of the present invention, a so-called CDMA (code division multiple access) system or PDC (Personal
Digital Cellilar System) mobile phones and P
In addition to HS (registered trademark: Personal Handyphone System), a portable terminal called PDA (Personal Digital Assistants: personal information equipment) is also included. Here, in the case of the PDA, in addition to the one in which the communication means is built in, the outgoing call (incoming call, communication) process, which is a feature of the present invention, is performed even if the communication means is connected from the outside.
What is performed by the main body is included in the present invention.

[0047]

As described above, according to the first aspect of the present invention, the downlink data is transmitted from the base station for each divided time according to the downlink data execution information (such as the activation state of the application) in each terminal. Can be appropriately assigned, and the convenience of the terminal executing downlink data is improved. For example, a longer transmission time can be assigned to a terminal requiring a large amount of downlink data, so that no stress is given to the user of the terminal. On the other hand, the transmission time allocated to terminals with a small amount of required data can be shortened,
The transmission capability of the base station can be utilized without waste.

According to the second aspect of the present invention, when the downlink data execution information is 0 (end of the application, etc.), the downlink data is not transmitted to the terminal in the next divided time. In addition, it is possible to more appropriately assign a terminal that performs transmission for each divided time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a base station according to an embodiment of the present invention.

FIG. 3 is a block diagram illustrating a schematic configuration of a mobile communication terminal according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a CIR-DRC conversion table.

FIG. 5 is another diagram showing a processing flow between the base station and the mobile communication terminal.

FIG. 6 is a diagram illustrating a mode in which downlink data is transmitted from a base station to two mobile communication terminals.

FIG. 7 is a diagram showing a mode in which a slot is allocated to each terminal in FIG.

FIG. 8 is a diagram for explaining a change in the number of assigned slots when the number of applications started is increased or decreased in the mobile communication terminal.

FIG. 9 is a diagram illustrating a mode of transmitting downlink data from a conventional base station to two mobile communication terminals.

FIG. 10 is a diagram showing a mode in which a slot is allocated to each terminal in FIG. 9;

[Explanation of symbols]

 30 Base stations A, B (mobile communication) terminals T1 to T6 Division time

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 AA11 BB06 CC05 DD01 DD02 HH02 KK01 MM04 5K030 GA11 HA08 HB01 HC01 HC09 JA11 JL01 JT01 JT03 LC01 MB04 5K034 AA01 AA05 BB06 CC05 DD03 EE03 EE11 HH01 K04A DDH DD48 EE02 EE10 EE16 EE23 EE71 HH22

Claims (7)

[Claims] The terminal predicts a downlink data communication speed on the terminal side based on a reception state of a signal from a base station in the terminal, and notifies the base station of the predicted downlink data communication speed, so that the base station can A base station of a mobile communication system that employs a data communication system that communicates data at a predicted downlink data communication rate, and a terminal information receiving unit that receives downlink data execution information at the terminal notified from the terminal, For the terminal, transmitting means for transmitting the data by time division multiplexing, based on the received downlink data execution information, terminal determining means for determining a terminal to transmit for each divided time in the time division multiplexing, A base station comprising: 2. The base station according to claim 1, wherein the terminal determination unit determines the terminal based on a value obtained by multiplying a predetermined determination value by a coefficient based on the downlink data execution information. 3. The terminal predicts a downlink data communication speed on the terminal side based on a reception state of a signal from the base station in the terminal, and notifies the base station of the predicted downlink data communication speed, so that the base station can A data communication system for communicating data at the predicted downlink data communication rate is adopted, and when the base station transmits the data by time division multiplexing to each terminal, the downlink data at the terminal notified from each terminal is transmitted. A mobile communication terminal for use in a mobile communication system that determines a terminal that performs transmission for each division time in the time-division multiplexing based on execution information, and terminal information acquisition for acquiring the downlink data execution information in the mobile communication terminal And a terminal information transmitting means for transmitting the acquired downlink data execution information to the base station. 4. The mobile communication terminal according to claim 3, wherein the terminal information obtaining unit obtains an activation state of an application that executes downlink data on the mobile communication terminal. 5. The apparatus further comprises a predetermined counter and counter control means, wherein the application includes an instruction to add the counter at the time of starting and to subtract the counter at the time of termination, and the counter control means controls the counter according to the instruction. The mobile communication terminal according to claim 4, wherein the terminal information obtaining means obtains a numerical value of the counter by adjusting a value. 6. A mobile communication system comprising: the base station according to claim 1; and an exchange for managing the base station. 7. The terminal predicts a downlink data communication rate on the terminal side based on a reception state of a signal from the base station in the terminal, and notifies the base station of the predicted downlink data communication rate, so that the base station can A mobile communication method adopting a data communication method of communicating data at a predicted downlink data communication speed, comprising: receiving downlink data execution information at the terminal notified from the terminal; Transmitting the data by multiplexing, and deciding a terminal to transmit for each division time in the time division multiplexing based on the received downlink data execution information. .