JP4540880B2 - Mobile communication system, mobile communication terminal of mobile communication system, and base station - Google Patents

Mobile communication system, mobile communication terminal of mobile communication system, and base station Download PDF

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Publication number
JP4540880B2
JP4540880B2 JP2001157138A JP2001157138A JP4540880B2 JP 4540880 B2 JP4540880 B2 JP 4540880B2 JP 2001157138 A JP2001157138 A JP 2001157138A JP 2001157138 A JP2001157138 A JP 2001157138A JP 4540880 B2 JP4540880 B2 JP 4540880B2
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mobile communication
communication terminal
base station
fluctuation prediction
information
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JP2002353876A (en
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克彦 清水
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京セラ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/448Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • Y02D70/449Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication terminal and a base station in a mobile communication system where a user can make data communication in an excellent reception state. SOLUTION: The mobile communication transmission terminal 1 has its own position detection function, transmits position information of its own station to base stations (2-1, 2-2, 2-3, etc.), at a prescribed frequency of transmission and also a notice request of fluctuation prediction information of a downlink data communication speed, the base stations receive the notice request, calculate the fluctuation prediction information of the downlink data communication speed on the basis of the position information received from the mobile communication terminal 1 and mobile information calculated from the position information at a present point of time, inform the mobile communication terminal 1 about the fluctuation prediction information, and the mobile communication terminal 1 receives the fluctuation prediction information and displays the fluctuation prediction information on a display section.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a Cdma2000 1x-EV DO system (or HDR system) or other base station signal (such as a pilot channel signal) in which the communication speed (data rate) in the direction from the base station to the mobile terminal (downlink direction) The present invention relates to a notification function of downlink data rate fluctuation prediction information to a mobile terminal user in a mobile communication system controlled so as to largely change depending on the reception state (received electric field strength, carrier-to-interference ratio = CIR).
[0002]
[Prior art]
In recent years, the cdma2000 1x-EV DO system has been developed as a next-generation high-speed wireless communication system.
The above cdma2000 1x-EV DO system is a standardized version of the HDR (High Data Rate) system, which is an extension of cdma2000 1x by Qualcomm. Std.T-64 1S-2000 CS0024 “cdma2000 High Rate Standardized by the “Packet Data Air Interface Specification”, cdmaOne method currently being serviced by KDDI in Japan (ARIB T-53 in Japan, EIA / TIA / IS-95 etc. in North America, Korea, etc.) However, the cdma2000 1x system corresponding to the third generation system (3G) is a system aimed at further improving the communication speed by specializing in data communication.
In cdma2000 lx-EV DO, EV means Evolution and DO means Data only.
[0003]
In the cdma2000 1x-EV DO method, when the reception state of the terminal is good by switching the modulation method of data transmitted from the base station to the terminal based on the information notified of the reception state received from the mobile communication terminal. Can use a high communication rate with low error tolerance but high speed, and a low speed but high error tolerance when reception is bad.
[0004]
Also, in the cdma2000 1x-EV DO downlink direction (from base station to mobile communication terminal), the time is divided in 1/600 second units, and only one mobile communication terminal communicates within that time. In addition, time division multiplex access (TDMA) is employed in which communication is performed with a plurality of portable communication terminals by switching the communication partner portable communication terminal according to time. As a result, it is always possible to transmit data with the maximum power to each mobile communication terminal, and data communication between mobile communication terminals can be performed at the fastest communication speed.
[0005]
[Problems to be solved by the invention]
On the other hand, in the cdma2000 1x-EV DO system described above, the data communication speed in the direction from the base station to the mobile communication terminal varies greatly depending on the reception state (for example, reception field strength, carrier-to-interference ratio = CIR) in the mobile communication terminal. It has the characteristic.
For example, in a mobile communication terminal, if the reception state is the best, data communication at a communication speed of 2.4 Mbps is possible, but if the reception state is bad, the data communication speed is reduced to about several tens of kbps. End up. Then, if downloading of a relatively large amount of data is started in a situation where the reception state at the mobile communication terminal is poor and only a low downlink data communication speed can be obtained, the following problems occur.
[0006]
First, since it takes a long time to complete the data download, the user is restricted in the time and cannot provide an environment where sufficient service can be performed.
Secondly, the communication time becomes long because the communication time becomes long.
Thirdly, during the download period, a part of CPU (central processing unit) processing capacity is devoted to data communication processing, and the response to user operations such as key input becomes slow.
[0007]
Fourth, the current consumption of the mobile communication terminal having the RF unit is dominated by the current consumption in the RF unit, and the current consumption in the RF unit greatly depends on the time when the RF unit is activated rather than the data communication speed. Therefore, performing data communication for a long time at a low data communication speed consumes more current than when performing data communication for a short time at a high data communication speed.
Fifth, when receiving a service that downloads video data or music data from the communication network side to the mobile communication terminal and also plays back on the terminal in parallel (video or music streaming playback), a predetermined value is used. The above downlink data communication speed is required. However, if the required downlink data communication speed cannot be obtained at this time, there may be effects such as image quality, sound quality degradation, video stoppage, and sound interruption. , Not enough service quality.
[0008]
The present invention has been made in view of such circumstances. By promptly and accurately notifying a user of a reception state that changes significantly depending on a location, the user can perform data communication in a good reception state. An object of the present invention is to provide a mobile communication terminal and a base station of a mobile communication system that can perform the above.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is such that the data communication speed in the downlink direction from the base station to the mobile communication terminal varies greatly depending on the reception state of the base station signal in the mobile communication terminal. In the mobile communication system to be controlled, the mobile communication terminal has a position detection function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and information on fluctuation prediction of the downlink data communication speed The base station receives the notification request, and the downlink data within a predetermined time from the present time based on the position information received from the mobile communication terminal and the movement information calculated from the position information. The communication speed fluctuation prediction information is calculated, the fluctuation prediction information is notified to the mobile communication terminal, and the mobile communication terminal receives the fluctuation prediction information and displays the fluctuation prediction information on a display unit. And wherein the Shimesuru.
[0010]
In the mobile communication system according to the second aspect of the present invention, the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to vary greatly depending on the reception state of the base station signal in the mobile communication terminal. In the portable communication terminal, the portable communication terminal has a position detecting function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and notifies the fluctuation prediction information of the downlink data communication speed. It transmits the request, receives downlink data communication speed fluctuation prediction information calculated by the base station, and displays the fluctuation prediction information on a display means.
[0011]
According to a third aspect of the present invention, there is provided a mobile communication system in which a downlink data communication speed from a base station to a mobile communication terminal is controlled so as to vary greatly depending on a reception state of a base station signal in the mobile communication terminal. In the base station, the base station receives a notification request for downlink data communication speed fluctuation prediction information from the mobile communication terminal, and receives the position information received from the mobile communication terminal and the movement information calculated from the position information. Based on the above, the fluctuation prediction information of the downlink data communication speed within a predetermined time from the present time is calculated, and the fluctuation prediction information is notified to the mobile communication terminal.
[0012]
According to a fourth aspect of the present invention, there is provided a mobile communication system in which a downlink data communication speed from a base station to a mobile communication terminal is controlled so as to vary greatly depending on a reception state of a base station signal in the mobile communication terminal. In the portable communication terminal, the portable communication terminal has a position detection function of the own station, sends the position information and movement information of the own station to the base station at a predetermined frequency, and predicts fluctuations in the downlink data communication speed. An information notification request is transmitted, and fluctuation prediction information of the downlink data communication speed calculated by the base station is received, and the fluctuation prediction information is displayed on a display means.
[0013]
According to the fifth aspect of the present invention, there is provided a mobile communication system in which a downlink data communication speed from a base station to a mobile communication terminal is controlled so as to vary greatly depending on a reception state of a base station signal in the mobile communication terminal. In the base station, the base station receives a notification request for downlink data communication speed fluctuation prediction information from the mobile communication terminal, and based on the position information and the movement information received from the mobile communication terminal for a predetermined time from the present time. The fluctuation prediction information of the downlink data communication speed is calculated, and the fluctuation prediction information is notified to the mobile communication terminal.
[0014]
According to a sixth aspect of the present invention, there is provided a mobile communication system in which a downlink data communication speed from a base station to a mobile communication terminal is controlled so as to vary greatly depending on a reception state of a base station signal in the mobile communication terminal. In the portable communication terminal, an operation means for performing various settings and instructions, a position detection means for detecting the position of the own station, a display means for displaying various data, and a detection output of the position detection means Station position information is transmitted to the base station at a predetermined frequency, and a downlink data communication speed fluctuation prediction information notification request is transmitted based on the operation of the operation means, and the downlink direction calculated by the base station And control means for receiving fluctuation prediction information of data communication speed and displaying the fluctuation prediction information on the display means.
[0015]
According to the seventh aspect of the present invention, there is provided a mobile communication system in which a downlink data communication speed from a base station to a mobile communication terminal is controlled so as to vary greatly depending on a reception state of a base station signal in the mobile communication terminal. Storage means for storing position information of the mobile communication terminal received from the mobile communication terminal at a predetermined frequency, and movement information of the mobile communication terminal based on the position information stored in the storage means The mobile information detection means for calculating the mobile communication terminal and the mobile communication terminal receives a notification request for prediction of fluctuations in downlink data communication speed, and the position information stored in the storage means and the movement information detection from the position information Based on the movement information calculated by the means, the fluctuation prediction information of the downlink data communication speed within a predetermined time from the current time is calculated, and the fluctuation prediction information is And having a control means for notifying.
[0016]
In the mobile communication system according to the eighth aspect of the present invention, the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal. Operating means for performing various settings and instructions, position detecting means for detecting the position of the own station, storage means for storing position information detected by the position detecting means, and various data Based on the display means for displaying and the position information stored in the storage means, the movement information of the own station is calculated, the position information and movement information of the own station are sent to the base station at a predetermined frequency, and the operation means A downlink data communication speed fluctuation prediction information notification request is transmitted based on the operation, and the downlink data communication speed fluctuation prediction information calculated by the base station is received, and the fluctuation prediction is received. And having a control means for displaying the broadcast on the display means.
[0017]
The invention according to claim 9 is a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to vary greatly depending on the reception state of the base station signal in the mobile communication terminal. Storage means for storing the location information and movement information of the mobile communication terminal received from the mobile communication terminal at a predetermined frequency, and a notification request for the downlink data communication speed fluctuation prediction information from the mobile communication terminal. Based on the position information and movement information stored in the storage means, calculate fluctuation prediction information of the downlink data communication speed within a predetermined time from the present time, and notify the mobile communication terminal of the fluctuation prediction information And a control means.
[0018]
ADVANTAGE OF THE INVENTION According to this invention, the user of a portable communication terminal can confirm the fluctuation | variation prediction information of the downlink data communication speed within a certain time from the present time, before starting data communication. As a result, the user of the mobile communication terminal has a higher probability of being able to avoid an unexpectedly long time download, and is more likely to be freed from the stress of waiting for the end of the long time download.
In addition, by selecting a reception state in which a high downlink data rate can be obtained and performing data communication (data download), it is possible to efficiently use base station equipment (capability).
[0019]
Furthermore, the data download time can be shortened by selecting a reception state in which a high downlink data rate is obtained and performing data communication (data download). As a result, when the user performs an operation such as key input, the possibility that the operational feeling deteriorates (because part of the CPU processing capacity is devoted to data communication processing) is reduced.
[0020]
In addition, the current consumption of mobile communication terminals that have an RF part such as mobile phones is dominated by the current consumption in the RF part, and the current consumption in the RF part is larger during the time the RF part is activated than the data communication speed. Although it depends, it is possible to reduce current consumption by shortening the data download time.
For hot springs that are premised on time charges for circuit switching, it is possible to reduce charges by shortening the data download time.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of a mobile communication system according to an embodiment of the present invention. In the figure, the mobile communication system according to the present embodiment includes a mobile communication terminal 1, base stations 2-1, 2-2, 2-3, ..., base stations 2-1, 2-2, 2- And a control station 3 that controls the overall control of. The control station 3 is connected to a network 5 such as the Internet via a router 4. In this mobile communication system, the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to change greatly depending on the reception state of the base station signal in the mobile communication terminal.
[0022]
In the above configuration, the mobile communication terminal 1 has a position detection function of the own station, and the base station that has jurisdiction over the service area in which the own station is located at a predetermined frequency, for example, the base station 2-1, And a request for notification of fluctuation prediction information of the downlink data communication speed is transmitted. (Hereinafter, the base station will be described by taking the base station 2-1 as an example. Of course, the configuration and operation of other base stations are the same as those of the base station 2-1.)
On the other hand, the base station 2-1 receives the notification request and, based on the position information received from the mobile communication terminal 1 and the movement information calculated from the position information, the downlink data communication speed within a predetermined time from the present time. The fluctuation prediction information is calculated and the fluctuation prediction information is notified to the mobile communication terminal 1. The mobile communication terminal 1 receives the fluctuation prediction information and displays the fluctuation prediction information on a display unit.
[0023]
Next, the configuration of the mobile communication terminal 1 is shown in FIG. FIG. 2 shows a configuration of the mobile communication terminal 1 adopting the cdma2000 1x-EV DO system according to an embodiment of the present invention.
As shown in FIG. 2, the mobile communication terminal 1 according to this embodiment includes an RF unit including an antenna 100, a duplexer 101, a demodulator 102, and a modulator 108, and a baseband including a decoder 103 and an encoder 107. A processing unit, a GPS receiving unit 105 as a position detecting unit for detecting the position of the own station, a CPU 104, a memory 109, a display unit 110 including a liquid crystal display, and an operation unit 111 such as a keypad and a keyboard are provided.
[0024]
In addition, an external interface with a personal computer (PC) 113 (for example, serial port, parallel port, USB, blue-tooth, infrared communication, 10base-T LAN, etc.) 112 so that the mobile communication terminal 1 can be used as a wireless modem. It has.
[0025]
The demodulator 102 demodulates the multiplexed signal from the received signal in the baseband band by a demodulation method corresponding to the modulation method of the received signal received from the base station, for example, the base station 2-1. In the present embodiment, demodulation is performed by any one of three demodulation schemes of QPSK (quadriphase phase shift keying), 8PSK (8 phase shift keying), and 16QAM (16 quadrature amplitude modulation). The received data demodulated by the demodulator 102 is decoded by the decoder 103. That is, the decoder 103 despreads the received multiplexed signal that has been spread spectrum.
[0026]
Here, when there is received data assigned to the own station (for example, data desired to be downloaded), the received data is output from the decoder 103 to the CPU 104. This received data is processed in the CPU 104 or sent to an external PC 113 or the like via the CPU 104 and the external interface 112.
[0027]
The CPU 9 determines whether there is transmission data generated in the portable communication terminal or input from the external PC 29 via the external interface 27. If there is transmission data, the CPU 9 The transmission data is output to the encoder 17. The transmission data is further encoded by the encoder 17, modulated by a modulator 19 by a specific modulation scheme (for example, QPSK), and transmitted to the base station via the duplexer 3 and the antenna 1. It has become.
[0028]
Next, the base station 2-1 includes an antenna 200, a reception unit 201, a transmission unit 202, a control unit 203, a network interface (I / F) unit 204 that interfaces with the control station, and downlink data in the mobile communication terminal. And a fluctuation prediction calculation unit 205 that calculates communication speed fluctuation prediction information.
The reception unit 201 receives transmission data from the mobile communication terminal, and the transmission unit 202 has a function of transmitting transmission data to the mobile communication terminal.
[0029]
Further, the fluctuation prediction calculation unit 205 includes a position information storage unit 2051, a movement information detection unit 2052, a DRC map storage unit 2053, and a DRC fluctuation prediction unit 2054.
The position information storage unit 2051 is a storage device that stores position information (for example, longitude and latitude information) transmitted from the mobile communication terminal 1. The movement information detection unit 2052 has a function of detecting the movement direction and movement speed of the mobile communication terminal 1 from the position information of the mobile communication terminal 1 read from the position information storage unit 2051.
[0030]
The DRC map storage unit 2053 is a storage device having a DRC (Data Rate Control Bit) map. DRC means “the highest transmission rate that can be received at a predetermined error rate or less” that is expected from the downlink reception state measured by the mobile terminal notified from the mobile terminal to the base station. However, in this embodiment, it is used as the downlink direction predicted data communication speed value for each place in the local station service area.
[0031]
Here, the DRC map is typically obtained by measuring in advance the reception radio wave status (location of CIR (carrier-to-interference ratio) of a downlink pilot signal output from the base station to the mobile communication terminal 1) for each place in the local station service area. A typical CIR value map is converted into a DRC value map using the CIR-DRC conversion table shown in Fig. 4. Incidentally, the CIR is calculated by the following equation.
CIR = (Ec / lo) / (1-Ec / lo) (1)
Ec / Io represents pilot signal strength versus total received signal strength.
[0032]
The DRC fluctuation prediction unit 2054 calculates DRC fluctuation prediction information that is fluctuation prediction information of the downlink data communication speed of the mobile communication terminal 1.
The control unit 203 includes a scheduler 2030 and controls each unit. The scheduler 2030 performs scheduling for which mobile communication terminal is to communicate with each mobile communication terminal currently in data communication for each time division unit.
[0033]
The operation of the mobile communication system according to the present embodiment configured as described above will be described with reference to the flowcharts of FIGS. 5 shows the operation of the mobile communication terminal 1 and the base station 2-1, FIG. 6 shows the operation of the mobile communication terminal 1, and FIGS. 7 and 8 show the operation of the base station 2-1. In these drawings, the mobile communication terminal 1 detects the position of its own station by the GPS receiver 105 (step 300).
[0034]
The GPS receiving unit 105 calculates the position of the own station based on the position information of the satellites received from the plurality of GPS satellites via the antenna 100. Note that the position detection in the mobile communication terminal 1 may be performed by the mobile communication terminal 1 alone as in the present embodiment, or a method in which the mobile terminal performs position detection with the support of the base station (for example, The GPS satellite position information may be sent from the base station 2-1 to the mobile communication terminal 1, and the mobile communication terminal 1 may detect and receive a radio wave from the GPS satellite based on the information to detect the position). .
[0035]
The mobile communication terminal 1 reports the detected position of the own station to the base station 2-1 with a predetermined frequency (step 301), and the base station 2-1 receives the position information of the mobile communication terminal 1, and the base station 2- 1 (steps 302 and 303). (The base station 2-1 also stores time information received from the portable communication terminal 1 as needed).
The mobile communication terminal 1 requests the base station 2-1 to notify the downlink data communication speed fluctuation prediction information by a predetermined operation on the operation unit 111 by the user (step 400).
The base station 2-1 calculates the downlink data communication speed fluctuation prediction information requested by the mobile communication terminal 1 and notifies the mobile communication terminal 1 of the calculation. This process will be described later as the operation of the base station.
[0036]
Next, when the mobile communication terminal 1 receives the downlink data communication speed fluctuation prediction information from the base station 2-1 (step 401), the mobile communication terminal 1 receives the downlink data communication speed fluctuation prediction information received on the display unit 110 as a numerical value, or It is displayed in the form of a graph or the like (step 402). The user of the mobile communication terminal 1 checks the information displayed on the display unit 110, and determines whether or not to perform data communication (downward data download) based on this information (step 403). When a high downlink data communication speed is obtained, data communication (for example, data download) is performed (steps 404 and 405). On the other hand, when a high downlink data communication speed cannot be obtained, data communication is performed. Without the operation, the operation of the mobile communication terminal 1 is terminated (step 403).
[0037]
Further, when the base station 2-1 receives the notification of the downlink data communication speed fluctuation prediction information from the mobile communication terminal 1 (step 500), the mobile information detection unit 2052 in the base station 2-1 receives the position information. Based on the change in the position information of the mobile terminal stored in the storage unit 2051, the movement information (movement direction, speed) of the mobile communication terminal 1 is calculated (step 501).
[0038]
Next, the DRC fluctuation prediction unit 2054 in the base station 2-1 calculates DRC fluctuation prediction information from the position, moving direction and speed of the mobile communication terminal 1 and the DRC map stored in the DRC map storage unit 2053. (Step 502). Next, it is determined whether there is a mobile communication terminal connected to the base station and performing data communication other than the mobile terminal that has requested the notification of the downlink data communication speed fluctuation prediction information (step 503).
[0039]
If there is a mobile communication terminal in data communication, DRC fluctuation prediction information is also calculated for the mobile communication terminal currently in data communication (step 504). Next, the DRC fluctuation prediction information of the mobile communication terminal 1 which has requested the notification of the downlink data communication speed fluctuation prediction information and the DRC fluctuation prediction information of the mobile communication terminal currently connected to the base station 2-1 and performing data communication are Input to the scheduler 2030 in the control unit 203 of the station 2-1, and the scheduler 2030 determines which mobile communication terminal to communicate for each time division unit based on the input DRC fluctuation prediction information of each mobile communication terminal. (Step 505). Here, the predicted value of the downlink transmission rate (modulation rate) used in communication in each time division unit is basically the highest possible transmission rate (modulation rate) based on the DRC value in that time division unit. ) Shall be used.
[0040]
Considering that the content of the downlink data communication is data download by the mobile communication terminal 1, the time range to be calculated for the downlink data communication speed fluctuation prediction information notified to the mobile communication terminal is the current (base About several minutes or more than ten minutes from the time when the station 2-1 is requested to notify the downlink data communication speed fluctuation prediction information or the latest position information is notified from the mobile communication terminal 1 to the base station 2-1. However, this time range may be selected stepwise by a predetermined operation by the user at the mobile communication terminal. It is determined whether or not the movement range of the mobile communication terminal 1 in this time range extends to the service area of the adjacent base station (including handoff) (step 506).
[0041]
If the determination in step 506 is negative, as a result of the determination in the scheduler 2030, the downlink data communication speed fluctuation prediction information is obtained for each mobile terminal, and the downlink data rate fluctuation prediction information is transmitted to the base station. The corresponding prediction information is notified to the mobile terminal that has requested the notification (step 510). Here, the DRC fluctuation prediction unit 2054 may be configured to include a scheduler dedicated to fluctuation prediction of the downlink data communication speed. As described above, the scheduler 2030 of the control unit 203 schedules which terminal performs communication for each time division unit with respect to the mobile communication terminal currently performing data communication, and the DRC fluctuation prediction unit 2054 is dedicated. It is considered that the burden on the scheduler 2030 of the control unit 203 can be reduced if the scheduler is provided.
[0042]
On the other hand, if the determination in step 506 is affirmative, that is, if the movement range of the mobile communication terminal in the above time range extends to the service area of the adjacent base station (when handoff is included), the mobile communication terminal is currently The base station 2-1 where 1 is located in the service area corresponds to the movement information and position of the mobile communication terminal 1 calculated by the movement information detection unit 2052 via the control station (or similar base station control device) 3. Notifying an adjacent base station (a base station expected to be a handoff destination) and requesting calculation of downlink data rate fluctuation prediction information of the target mobile terminal in the service area through the control station in the same manner (step 507) .
[0043]
The neighboring base station that has received the request calculates the downlink data communication speed fluctuation prediction information for the target mobile communication terminal in the local station service area in the same manner as described above, and controls it to the requesting base station. Notification is made via the station 3 (step 508). In the base station (the base station in which the mobile terminal is currently located in the service area) 2-1 that has received the notification, the fluctuation prediction information of the downlink data communication speed in the service area in the adjacent base station and the local service area Fluctuation information for downlink data communication speeds across a plurality of base station service areas combined with the above information is created and notified to the information requesting mobile communication terminal (step 509).
[0044]
Note that the location information detected by the mobile communication terminal 1 in the above description is stored in a storage device in the mobile communication terminal 1, and when requesting notification of fluctuation prediction information of the downlink data communication speed to the base station, the location information Movement information (movement direction, speed) may be calculated by the mobile communication terminal 1 from the change, and the position information and movement information may be sent to the base station together with the downlink data communication speed fluctuation prediction information notification request.
[0045]
In this case, after the mobile communication terminal 1 connects to the base station and starts data communication, the mobile communication terminal notifies the base station of the location information and movement information at a predetermined frequency. Is stored in the storage device in the base station, and when the mobile communication terminal in the base station service area requests downlink data rate fluctuation prediction information, the state of the mobile communication terminal that is performing data communication in the base station area is also Taking into consideration, it is possible to calculate the downlink data communication speed fluctuation prediction information of the mobile communication terminal that has requested the information. This is because if the mobile terminal notifies the base station of the location information and the mobile information only when the base station requests the notification of the downlink data rate fluctuation prediction information, the DRC fluctuation prediction is also made for the terminal in data communication. This is to avoid this situation because it is impossible to calculate the downlink data communication speed fluctuation prediction information of the mobile communication terminal that has issued the prediction information notification request in the scheduler after obtaining the information.
[0046]
In the above description, the DRC fluctuation prediction unit 2054 and the DRC map storage unit 2053 in the base station 2-1 may be provided in the control station (or similar base station control device) 3. In this case, the DRC map storage unit in the control station 3 stores the DRC maps of all the base stations controlled by the control station 3, and each base station sends a request for notification of fluctuation prediction information of the downlink data communication speed. The location information and the movement information of the mobile communication terminal that has performed and the mobile communication terminal in data communication with the base station are sent to the control station 3, and the downlink data rate for the mobile terminal that has made the information request from the control station 3 The fluctuation prediction information may be sent to the corresponding base station, and the base station may notify the mobile communication terminal that has made the fluctuation prediction information notification request of the downlink data communication speed fluctuation prediction information.
[0047]
As described above, according to the present embodiment, the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal. In the mobile communication system, the mobile communication terminal has a position detecting function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and notifies the downlink data communication speed fluctuation prediction information. The base station receives the notification request, and the downlink data communication speed within a predetermined time from the present time based on the position information received from the mobile communication terminal and the movement information calculated from the position information. The fluctuation prediction information is calculated, the fluctuation prediction information is notified to the portable communication terminal, and the portable communication terminal receives the fluctuation prediction information and displays the fluctuation prediction information on a display means. Since the way, advantages are obtained as shown below.
[0048]
That is, according to the present embodiment, the user of the mobile communication terminal can confirm the downlink data communication speed fluctuation prediction information within a certain time from the current time before starting the data communication. As a result, the user of the mobile communication terminal has a higher probability of being able to avoid an unexpectedly long time download, and is more likely to be freed from the stress of waiting for the end of the long time download.
In addition, by selecting a reception state in which a high downlink data rate can be obtained and performing data communication (data download), it is possible to efficiently use base station equipment (capability).
[0049]
Furthermore, the data download time can be shortened by selecting a reception state in which a high downlink data rate is obtained and performing data communication (data download). As a result, when the user performs an operation such as key input, the possibility that the operational feeling deteriorates (because part of the CPU processing capacity is devoted to data communication processing) is reduced.
[0050]
In addition, the current consumption of mobile communication terminals that have an RF part such as mobile phones is dominated by the current consumption in the RF part, and the current consumption in the RF part is larger during the time the RF part is activated than the data communication speed Although it depends, it is possible to reduce current consumption by shortening the data download time.
For hot springs that are premised on time charges for circuit switching, it is possible to reduce charges by shortening the data download time.
[0051]
【The invention's effect】
According to the present invention, in the mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal, the mobile communication The terminal has a position detection function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and sends a notification request for downlink data communication speed fluctuation prediction information, the base station Receiving the notification request, calculating the fluctuation prediction information of the downlink data communication speed within a predetermined time from the current time based on the position information received from the mobile communication terminal and the movement information calculated from the position information, While notifying the mobile communication terminal of the fluctuation prediction information, the mobile communication terminal receives the fluctuation prediction information and displays the fluctuation prediction information on the display means. UNA effect can be obtained.
[0052]
That is, according to the present invention, the user of the mobile communication terminal can confirm the downlink data communication speed fluctuation prediction information within a certain time from the current time before starting the data communication. As a result, the user of the mobile communication terminal has a higher probability of being able to avoid an unexpectedly long time download, and is more likely to be freed from the stress of waiting for the end of the long time download.
In addition, by selecting a reception state in which a high downlink data rate can be obtained and performing data communication (data download), it is possible to efficiently use base station equipment (capability).
[0053]
Furthermore, the data download time can be shortened by selecting a reception state in which a high downlink data rate is obtained and performing data communication (data download). As a result, when the user performs an operation such as key input, the possibility that the operational feeling deteriorates (because part of the CPU processing capacity is devoted to data communication processing) is reduced.
[0054]
In addition, the current consumption of mobile communication terminals that have an RF part such as mobile phones is dominated by the current consumption in the RF part, and the current consumption in the RF part is larger during the time the RF part is activated than the data communication speed Although it depends, it is possible to reduce current consumption by shortening the data download time.
For hot springs that are premised on time charges for circuit switching, it is possible to reduce charges by shortening the data download time.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a specific configuration of the mobile communication terminal in FIG.
FIG. 3 is a block diagram showing a specific configuration of the base station in FIG. 1;
FIG. 4 is an explanatory diagram showing the contents of a CIR-DRC table.
FIG. 5 is a flowchart showing an example of operations of the mobile communication terminal and the base station in FIG.
6 is a flowchart showing an example of the operation of the mobile communication terminal in FIG.
7 is a flowchart showing an example of the operation of the base station in FIG.
8 is a flowchart showing an example of the operation of the base station in FIG.
[Explanation of symbols]
1 Mobile communication terminal
2-1, 2-2, 2-3. … base station
3 control stations
4 routers
5 network
100, 200 antenna
101 Duplexer
102 Demodulator
103 Decoder
104 CPU
105 GPS receiver
107 Encoder
108 modulator
109 memory
110 Display section
111 Operation unit
201 Receiver
202 Transmitter
203 control unit
204 Network interface (I / F) section
205 Fluctuation prediction calculator
2051 Location information storage unit
2052 Movement information detection unit
2053 DRC map storage unit
2054 DRC fluctuation prediction unit

Claims (9)

  1. In a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal,
    The mobile communication terminal has a position detection function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and sends a notification request for downlink data communication speed fluctuation prediction information,
    The base station receives the notification request, and calculates the downlink data communication speed fluctuation prediction information within a predetermined time from the current time based on the position information received from the mobile communication terminal and the movement information calculated from the position information. Calculating and notifying the mobile communication terminal of the fluctuation prediction information,
    The mobile communication terminal receives the fluctuation prediction information and displays the fluctuation prediction information on a display means.
  2. In the mobile communication terminal of the mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal,
    The mobile communication terminal has a position detection function of the own station, sends the position information of the own station to the base station at a predetermined frequency, and sends a notification request for downlink data communication speed fluctuation prediction information, A mobile communication terminal of a mobile communication system, which receives fluctuation prediction information of a downlink data communication speed calculated by the base station and displays the fluctuation prediction information on a display means.
  3. In a base station of a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to change greatly depending on the reception state of the base station signal in the mobile communication terminal,
    The base station receives a notification request for downlink data communication speed fluctuation prediction information from the mobile communication terminal, and based on the position information received from the mobile communication terminal and the movement information calculated from the position information A base station of a mobile communication system, wherein fluctuation prediction information of downlink data communication speed within a predetermined time is calculated and the fluctuation prediction information is notified to the mobile communication terminal.
  4. In the mobile communication terminal of the mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal,
    The mobile communication terminal has a position detection function of the own station, sends the position information and movement information of the own station to the base station at a predetermined frequency, and sends a notification request for downlink data communication speed fluctuation prediction information. In addition, the mobile communication terminal of the mobile communication system receives the fluctuation prediction information of the downlink data communication speed calculated by the base station and displays the fluctuation prediction information on a display means.
  5. In a base station of a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to change greatly depending on the reception state of the base station signal in the mobile communication terminal,
    The base station receives a notification request of downlink data communication speed fluctuation prediction information from the mobile communication terminal, and downloads downlink data within a predetermined time from the current time based on the position information and movement information received from the mobile communication terminal. A base station of a mobile communication system, which calculates communication speed fluctuation prediction information and notifies the mobile communication terminal of the fluctuation prediction information.
  6. In the mobile communication terminal of the mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal,
    Operation means for making various settings and instructions;
    Position detecting means for detecting the position of the own station;
    Display means for displaying various data;
    Captures the detection output of the position detecting means, sends the position information of the own station to the base station at a predetermined frequency, and sends a notification request for downlink data communication speed fluctuation prediction information based on the operation of the operating means. And control means for receiving fluctuation prediction information of the downlink data communication speed calculated by the base station and displaying the fluctuation prediction information on the display means,
    A mobile communication terminal of a mobile communication system characterized by comprising:
  7. In a base station of a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to change greatly depending on the reception state of the base station signal in the mobile communication terminal,
    Storage means for storing position information of the mobile communication terminal received from the mobile communication terminal at a predetermined frequency;
    Movement information detection means for calculating movement information of the mobile communication terminal based on position information stored in the storage means;
    Based on the position information stored in the storage means and the movement information calculated by the movement information detection means based on the position information received from the mobile communication terminal in the downlink data communication speed fluctuation prediction information notification request. Control means for calculating fluctuation prediction information of the downlink data communication speed within a predetermined time from the present time, and notifying the fluctuation prediction information to the mobile communication terminal;
    A base station of a mobile communication system characterized by comprising:
  8. In the mobile communication terminal of the mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to largely change depending on the reception state of the base station signal in the mobile communication terminal,
    Operation means for making various settings and instructions;
    Position detecting means for detecting the position of the own station;
    Storage means for storing position information detected by the position detection means;
    Display means for displaying various data;
    Based on the location information stored in the storage means, the mobile station's movement information is calculated, the local station's location information and movement information is sent to the base station at a predetermined frequency, and the downlink direction based on the operation of the operation means A control means for sending a notification request for fluctuation prediction information on the data communication speed, receiving fluctuation prediction information on the downlink data communication speed calculated by the base station, and displaying the fluctuation prediction information on the display means;
    A mobile communication terminal of a mobile communication system characterized by comprising:
  9. In a base station of a mobile communication system in which the data communication speed in the downlink direction from the base station to the mobile communication terminal is controlled so as to change greatly depending on the reception state of the base station signal in the mobile communication terminal,
    Storage means for storing position information and movement information of the mobile communication terminal received from the mobile communication terminal at a predetermined frequency;
    A notification request for downlink data communication speed fluctuation prediction information is received from the mobile communication terminal, and the downlink data communication speed fluctuation within a predetermined time from the present time based on the position information and movement information stored in the storage means Control means for calculating prediction information and notifying the mobile communication terminal of the fluctuation prediction information;
    A base station of a mobile communication system characterized by comprising:
JP2001157138A 2001-05-25 2001-05-25 Mobile communication system, mobile communication terminal of mobile communication system, and base station Expired - Fee Related JP4540880B2 (en)

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JP4310173B2 (en) 2003-11-21 2009-08-05 株式会社日立コミュニケーションテクノロジー Terminal and communication method thereof
US7768975B2 (en) * 2004-03-29 2010-08-03 Telecordia Technologies, Inc. Fast handoff using GPS technology for mobile telematics
US7978667B2 (en) 2006-11-30 2011-07-12 Kyocera Corporation Management of WLAN and WWAN communication services to a multi-mode wireless communication device
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US8233433B2 (en) * 2008-02-26 2012-07-31 Kyocera Corporation Apparatus, system and method for initiating WLAN service using beacon signals
JP4873028B2 (en) * 2009-03-06 2012-02-08 株式会社日立製作所 Terminal and communication method thereof
JP5440052B2 (en) 2009-09-11 2014-03-12 ソニー株式会社 Relay station apparatus, base station apparatus, mobile station apparatus, and radio communication system
JP5413073B2 (en) 2009-09-11 2014-02-12 ソニー株式会社 Mobile station apparatus, base station apparatus, and radio communication system
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