JPWO2007138714A1 - Connection control method for mobile communication system, base station apparatus and terminal apparatus - Google Patents

Connection control method for mobile communication system, base station apparatus and terminal apparatus Download PDF

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JPWO2007138714A1
JPWO2007138714A1 JP2008517770A JP2008517770A JPWO2007138714A1 JP WO2007138714 A1 JPWO2007138714 A1 JP WO2007138714A1 JP 2008517770 A JP2008517770 A JP 2008517770A JP 2008517770 A JP2008517770 A JP 2008517770A JP WO2007138714 A1 JPWO2007138714 A1 JP WO2007138714A1
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transmission power
terminal
base station
connection
predicted
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JP4806709B2 (en
Inventor
齋藤 利行
利行 齋藤
桑原 幹夫
幹夫 桑原
大悟 高柳
大悟 高柳
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株式会社日立コミュニケーションテクノロジー
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Priority to PCT/JP2006/311175 priority Critical patent/WO2007138714A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/22TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/223TPC being performed according to specific parameters taking into account previous information or commands predicting future states of the transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/50TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Abstract

Provides a connection regulation system that supports mobile communications. When determining whether or not a terminal can be accepted, a predicted value of transmission power when communication is started is acquired, and the connection is restricted based on a result of comparison with a threshold value. By calculating the transmission power when data is not being transmitted on the terminal side, and predicting the transmission power during data transmission and notifying the base station, the base station can receive communication unless the transmission power exceeds a certain level. Predict devices that cannot be used and regulate connections.

Description

  The present invention relates to a connection control method for a wireless communication system, and more particularly to a connection control method suitable for application to a mobile communication system.

FIG. 1 shows the system configuration of the present invention. A plurality of mobile stations 103, 104, 105 and 106 communicate with the base stations 101 and 102 via radio. The base stations 101 and 102 are controlled by the base station control station 107, and communication between the mobile stations or communication between the mobile station and a communication device belonging to the fixed network 108 is established. When communication is established between a mobile station and a communication device belonging to the fixed network 108, some mobile stations are selected from all the mobile stations to which the mobile station belongs.
In such a wireless communication system, in order to improve the throughput of communication from a base station to a terminal, a means (scheduling) that preferentially selects a terminal that belongs to the same base station and that has a high transmission rate capable of communication )It has been known. For example, A. Jalali, R.A. Padovani, and R.R. Pankaj, “Data throughput of CDMA-HDR a high efficiency-high data personal communication wireless system 2000”, IEEE VTC-Spring 2000, Tokyo Base station while ensuring fairness between terminals by notifying the terminal in the form of transmission speed and determining the terminal whose transmission ratio is the maximum ratio between the maximum transmission speed that can be received and the average rate in a predetermined period in the past. A technique for improving the throughput is disclosed.
In addition, in order to improve the throughput of communication from a terminal to a base station, there is known a means in which terminals belonging to the same base station and the same frequency independently perform code multiplex communication using different codes. At this time, the transmission power of the terminal is controlled in order to equalize the reception quality at the base station side at each terminal and to cancel the fluctuation of the propagation path between each terminal and the base station. This control procedure is shown in FIG.
The base station that has received the pilot signal or data signal (201) transmitted from the terminal calculates the SIR of the received signal (202) and decodes the data (203). Then, a transmission power control signal (204) corresponding to the calculated SIR value is generated and notified to the terminal. When calculating the SIR using a pilot signal whose transmission power is known, the propagation path attenuation for the terminal is estimated from the SIR, and uplink data is transmitted with a transmission power value in consideration of the propagation path attenuation. The terminal is controlled by the transmission power control signal. Alternatively, when calculating the SIR of the data signal, an instruction to control the transmission power at the next data transmission (decrease, increase, or maintain the transmission power) depending on whether the SIR is sufficient or not is given. It is good to transmit as a transmission power control signal. Also, the base station transmits ACK or NAK corresponding to the data decoding result to the terminal. In response to this, the terminal that has received the transmission power control signal controls the power for transmitting the data signal (206). Various methods are already well known for uplink transmission power control in CDMA communication or the like.
Consider the case where mobile stations 103, 104, and 105 communicate with the base station 101 at the same frequency in a situation where code multiplex communication is performed in this way. Since the code orthogonality may not be maintained due to a synchronization shift or the like, interference power on the base station side increases due to communication of other terminals, and communication quality deteriorates.
The reception quality k of a signal from a certain terminal on the base station side is expressed as follows, where S is the pilot signal power at the base station side, I is the total received power derived from terminals other than the terminal, and N is the thermal noise power. It is represented by (1).
Further, the reception quality k is expressed by equation (2), where PG_SS is the spreading gain of code spreading, r is the ratio of transmission power to pilot reception power, and n is the number of connected terminals of the base station.
Therefore, the total received power Pt of the base station is expressed by equation (3). The received power Pt diverges with the number n of connections represented by the equation (4).
In a region where the received power diverges, each terminal increases the transmission power, and the terminal that finally reaches the upper limit of the transmission power cannot satisfy the desired reception power S, and the reception quality k deteriorates. There is. To solve this problem, there is a known method for preventing n from exceeding a certain level by controlling the received power Pt on the base station side and restricting connection of a new terminal when Pt exceeds a set threshold. (See JP 2002-217756 A). When similar communication is performed at a plurality of frequencies, a terminal whose connection is restricted at a certain frequency may try to accept at another frequency.
However, in a system including a radio link, there is a possibility that a terminal whose reception quality k cannot satisfy a desired value may occur even in a region where the reception power Pt does not diverge. This is because when the propagation path is very poor, there is an upper limit value in the transmission power of the terminal, and thus transmission power that satisfies the desired reception pilot power S in Equation (1) cannot be achieved.
As a control that focuses on the transmission power of the terminal, there is known a method of suppressing transmission power waste and interference with other terminals by stopping transmission on the terminal side when the transmission power exceeds a certain level (specialty). No. 2002-290326).

Since the control based on the reception power on the base station side (see Japanese Patent Application Laid-Open No. 2002-217756) can only refer to the reception value via the radio propagation path, the connection quality due to the lack of transmission power on the terminal side There was a problem that it was impossible to predict the deterioration of the material. These terminals not only cannot achieve the desired communication quality, but also interfere with the communication of other terminals by communicating with the upper limit transmission power, so it is necessary to regulate the connection.
In addition, communication with the upper limit transmission power can be avoided by a method of stopping transmission when the transmission power exceeds a certain level (see Japanese Patent Application Laid-Open No. 2002-290326). There is a problem that communication quality deteriorates when it stops. In the first place, it is necessary to regulate the connection of terminals whose transmission power is close to the upper limit.
Accordingly, an object of the present invention is to provide a method for predicting the achievement level of communication quality based on terminal transmission power and appropriately restricting connection.
[Means for solving problems]
In a typical embodiment of the present invention, when a communication start request is received from a terminal, an expected value of average transmission power is acquired when the terminal performs the communication, and the acquired expected value is compared with a threshold value. To determine whether to accept the terminal.
According to an aspect of the present invention, it is possible to predict a terminal that cannot achieve a desired communication quality due to insufficient transmission power. A terminal that cannot achieve such communication quality is not detected by the connection restriction method based on the received value on the base station side. Thereby, the terminal can be expected to avoid charging due to communication less than the desired quality and achieve the desired communication quality by using other frequencies.
Moreover, the system side can suppress that the terminal which cannot achieve desired communication quality interferes with communication of another terminal by communicating with the upper limit transmission power.

FIG. 1 is an overall configuration diagram of a mobile communication system.
FIG. 2 is a sequence diagram for controlling the data transmission power of the mobile communication system.
FIG. 3 is a control sequence diagram of the first connection control method (during call and handover) of the present invention.
FIG. 4 is a conceptual diagram of the first method for determining whether to accept a terminal according to the present invention.
FIG. 5 is a control sequence diagram of the second connection regulating method of the present invention.
FIG. 6 is a control sequence diagram of the first connection restriction method (incoming call) of the present invention.
FIG. 7 is a control sequence diagram of the third connection regulating method of the present invention.
FIG. 8 is a conceptual diagram of a second terminal acceptability determination method according to the present invention.
FIG. 9 is a flowchart of the operation of the terminal in the first connection regulation method of the present invention.
FIG. 10 is a flowchart of the operation of the base station in the first connection regulation method of the present invention.
FIG. 11 is a flowchart of the operation of the terminal in the second connection regulation method of the present invention.
FIG. 12 is a flowchart of the operation of the base station in the second connection regulation method of the present invention.
FIG. 13 is a flowchart of the operation on the terminal side of the third connection regulating method of the present invention.
FIG. 14 is a base station operation flowchart of the second terminal acceptability determination method of the present invention.
FIG. 15 is a block diagram of a configuration example of a terminal-side wireless communication device according to the first and second connection restriction methods of the present invention.
FIG. 16 is a block diagram of a configuration example of a base station side wireless communication device according to the first and second connection restriction methods of the present invention.
FIG. 17 is a block diagram of a configuration example of a terminal-side wireless communication device according to the third connection restriction method of the present invention.
FIG. 18 is a block diagram of a configuration example of a base station-side radio communication device according to the second terminal acceptability determination method of the present invention.

A control sequence of the first connection control method of the present invention is shown in FIG. A terminal desiring to start communication first controls transmission power in a state where data is not transmitted (301), and calculates transmission power in a state where data is not transmitted. Next, the transmission power in the case of transmitting data is predicted based on the transmission power in the state of not transmitting data and the data rate of communication (302), and the predicted transmission power information and connection request are notified to the base station. (303).
The base station determines whether or not to start communication based on the notified predicted power (304), and notifies the terminal of information on whether or not the communication is accepted (305). If it is acceptable, a connection setting procedure is performed thereafter, and data transmission is started.
Also for the data signal transmitted from the terminal to the base station, the transmission power is controlled in the same manner as the transmission power control 301 in a state where no data is transmitted. For example, transmission power control as shown in FIG. 2 is performed. The determination of whether or not the terminal can be accepted (304) may be combined with control based on the load of the base station. The transmission power used for prediction in the transmission power prediction (302) may use a value of several percent from the beginning when the instantaneous values are arranged in descending order.
In transmission power control 301 in a state where data is not transmitted, for example, a control signal and / or an uplink pilot signal for transmission power control transmitted from the terminal to the base station is used. The base station receives the signal from the terminal, measures the received power, and instructs the terminal to increase or decrease the transmission power (for example, with the goal of equalizing the signal received power from each terminal). To do. Alternatively, when the transmission power of the control signal and / or uplink pilot signal from the terminal is known at the base station, attenuation in the propagation path is obtained from the reception power at the base station. For this reason, the transmission power necessary to match the target reception power may be calculated, and the necessary transmission power may be notified to each terminal.
By controlling the transmission power using a control signal other than data, there is an advantage that the transmission power control procedure can be performed with a smaller transmission signal amount (that is, without squeezing communication resources). Since a control signal other than data is used, the base station can determine whether or not to accept the connection request of the terminal before connection for data communication. Therefore, it may interfere with other terminals when the connection is permitted, or the connection of terminals that cannot actually perform data communication effectively because the communication path condition is poor even if the connection is permitted is suppressed in advance. Can do.
As the transmission power prediction (302) when data transmission is performed, for example, a final control result value of transmission power control (301) when data is not transmitted can be used.
FIG. 4 shows a first method for determining whether to accept a terminal according to the present invention. The base station compares the predicted transmission power (303) notified by the terminal and the threshold (401) related to the transmission power, and allows the terminal (402) that is likely to start communication with transmission power equal to or less than the threshold to accept the threshold. By rejecting the acceptance of the terminal (403) that is expected to communicate with the transmission power exceeding the threshold, the acceptance of the terminal communicating with the transmission power close to the upper limit is avoided. Note that the threshold (401) need not be fixed. For example, the threshold value may be changed in conjunction with the received power of the base station.
FIG. 3 shows the operation in the case of new connection (calling) and handover of the terminal. In the case of an incoming call, communication start is desired from the system side, and the control sequence is as shown in FIG. 6, and the procedure after the transmission power control 301 is started with an incoming call process from the base station as a trigger.
FIG. 9 shows a flowchart of the operation of the terminal in the first connection regulation method of the present invention. The terminal starts transmission power control (902) in a state in which data is not transmitted with the occurrence of desired communication start (901) as a trigger, and transmission obtained during a period in which constant transmission power control (902) is performed The transmission power during communication is predicted based on the power information (903), and the connection request and the predicted transmission power are notified to the base station (904, 905).
FIG. 10 shows a flowchart of the operation of the base station in the first connection control method of the present invention. When a notification of the connection request and the predicted transmission power is received from the terminal (1001, 1002), the notified transmission power (1002) is compared with the threshold set on the base station side (1003). As a result, if the notified transmission power is equal to or lower than the threshold, the terminal accepts the connection (1004), and if the notified transmission power exceeds the threshold, the terminal rejects the connection (1005). Then, the terminal side is notified of the information on acceptance / rejection determined (1006).
FIG. 15 shows a configuration of a terminal-side wireless communication device related to the first connection restriction method of the present invention. The received signal input from the antenna is converted into a baseband signal by the radio frequency circuit (1501), and power control information is extracted by the power control signal extraction unit (1502). Based on the extracted power control information and the transmission power information at the time of the previous transmission stored in the transmission power information storage unit (1503), the transmission power when the transmission power update unit (1504) transmits next is determined. decide.
The transmission power control unit (1508) transmits the next transmission data or control signal using the updated transmission power (however, when controlling the transmission power using an uplink pilot signal with a constant transmission power, The pilot signal is transmitted without going through the transmission power control unit.) When a connection is desired, the control unit (1505) determines the timing for notifying the connection request, transmits a connection request notification (1507), and stores the previous transmission time stored in the transmission power information storage unit (1503). Based on the communication information obtained from the control unit (1505), the notification transmission power determination unit (1506) predicts the transmission power during communication and notifies the base station of the transmission power information and timing.
The power control signal extraction unit (1502), the transmission power information storage unit (1503), the transmission power update unit (1504), and the transmission power control unit (1508) are commonly used for transmission power control of the data signal and the control signal. .
FIG. 16 shows the configuration of a radio communication device on the base station side relating to the first connection control method of the present invention. The received signal input from the antenna is converted into a baseband signal by a radio frequency circuit (1601), information of communication desired to be connected is extracted by a connection desire notification extracting unit (1602), and a transmission power information extracting unit ( 1603), the predicted transmission power information at the time of communication is extracted. The predicted transmission power acquisition unit (1604) inputs the predicted transmission power information obtained by the transmission power information extraction unit (1603) to the connection availability determination unit (1606). The predicted transmission power threshold value determination unit (1605) sets a threshold value based on the received power of the base station, and inputs the threshold value to the connection possibility determination unit (1606). The connection availability determination unit (1606) compares the predicted transmission power input from the predicted transmission power acquisition unit (1604) with the threshold input from the predicted transmission power threshold determination unit (1605), and connects the terminal. The terminal determines whether to permit or not, and notifies the terminal of the determined connection permission information (1607). In the transmission power control signal generation unit (1608), in order to control the transmission power from the terminal, the reception SIR of the data signal received from the terminal or the received control signal is measured, and the transmission power control signal corresponding to the reception SIR is obtained. The generated transmission power control signal is transmitted to the terminal.
A control sequence of the second connection control method of the present invention is shown in FIG. The operations of 301, 304, and 305 are the same as those of the first method described above. The terminal notifies the base station side of transmission power information in a state in which data is not transmitted together with the connection request (501), and the base station transmits transmission power during data transmission based on the notified power information and data rate information. Is predicted (502).
FIG. 11 shows a flowchart of the operation of the terminal in the second connection regulation method of the present invention. Operations 901, 902 and 904 are the same as those in the first connection regulation method described above. The second method is different from the first method described above in that the transmission power information in a state in which data is not transmitted is directly notified to the base station (1101).
FIG. 12 shows a flowchart of the operation of the base station in the second connection control method of the present invention. The operations of 1001, 1003, 1004, 1005 and 1006 are the same as those in the first connection restriction method described above. Receives a notification of transmission power information in a state in which no data is transmitted from the terminal (1201), and transmits the transmission power during communication based on the communication information notified in connection request (1001) and the transmission power information notified in 1201. Prediction (1202) is added.
The configuration of the wireless communication device on the terminal side to which the second connection restriction method of the present invention is applied is the same as that shown in FIG. However, the notification transmission power determination unit (1506) notifies the base station of transmission power information in a state in which data is not transmitted based on the transmission power information stored in the transmission power information storage unit (1503).
The configuration of the radio communication device on the base station side relating to the second connection control method of the present invention is the same as that shown in FIG. However, the transmission power information extraction unit (1603) extracts predicted transmission power information when communication is not performed, and the predicted transmission power acquisition unit (1604) transmits transmission power information obtained by the transmission power information extraction unit (1603). Based on the communication information obtained by the connection request notification extraction unit (1602), the transmission power during communication is predicted, and the prediction result is input to the connection availability determination unit (1606).
A control sequence of the third connection regulating method of the present invention is shown in FIG. The operations 301 and 302 are the same as those in the first method described above. The base station notifies the current load status to the terminal (701). The terminal determines whether or not a connection is desired based on the predicted transmission power during data transmission and the notified load status (702).
As the load status, for example, the number of terminals currently connected to the base station and transmitting uplink data and / or the total received power of the terminals receiving data at the base station can be used.
FIG. 13 shows a flowchart of the operation of the terminal of the third connection regulation method of the present invention. Operations 901, 902 and 903 are the same as those in the first connection regulation method described above. Load information is acquired from the base station (1301), and a threshold value of transmission power is determined based on the acquired load information (1302). The predicted transmission power during communication obtained in the transmission power prediction (903) is compared with the threshold value determined in 1302 (1303), and if the predicted transmission power is less than or equal to the threshold value, the execution of connection request is determined (1304) If the predicted transmission power exceeds the threshold value, it is determined to cancel the connection request (1305).
In the determination 1302 of the transmission power threshold, for example, when the load on the base station is higher, the transmission power threshold may be set lower. This is because, when the load on the base station is already high, it is better to strictly limit the connection of terminals with high required transmission power.
FIG. 17 shows the configuration of the terminal-side wireless communication device related to the third connection restriction method of the present invention. The operations of 1501, 1502, 1503, 1504, 1505, 1506, and 1508 are the same as those in the first connection restriction method described above. The base station load information extraction unit (1701) extracts the load information of the base station from the output signal of the radio frequency circuit (1501). A transmission power threshold value determination unit (1702) determines a threshold value related to terminal transmission power during communication based on the extracted load information. The connection desire determination unit (1703) compares the predicted transmission power during communication output from the notification transmission power determination unit (1506) with the threshold output from the transmission power threshold determination unit (1702), and determines the connection request (1704). Decide whether to notify the base station.
FIG. 8 shows a second method for determining whether to accept a terminal according to the present invention. This second terminal acceptability determination method can be used as an alternative to the first terminal acceptability determination method (FIG. 4). The new connection is restricted based on the total value of the predicted transmission power (303) notified by the terminal for all terminals. As the number of terminals receiving communication in a poor wireless environment increases, the total value of predicted power increases. The total value of the predicted transmission power for all terminals is compared with the threshold value (401) relating to the total value, and when the total value is equal to or smaller than the threshold value (802), the acceptance of all new connections is permitted. If it exceeds (803), all new connections are rejected. As a result, control is performed in consideration of terminals communicating in a poor wireless environment. It may be combined with the first terminal acceptability determination method.
FIG. 14 shows a flowchart of the operation of the base station of the second method for determining whether to accept terminals according to the present invention. The operations 1001 and 1002 are the same as those in the first connection restriction method described above. Based on the predicted transmission power notified in 1002, the predicted power total value for all terminals when the connection is permitted is predicted (1401). The predicted total value is compared with a threshold value, and if the total value is less than or equal to the threshold value, the terminal connection is accepted (1402). If the luxury position exceeds the threshold value, the terminal connection rejection is determined (1403). ).
FIG. 18 shows the configuration of the base station-side radio communication device related to the second terminal acceptability determination method of the present invention. The operations of 1601, 1602, 1603, 1604, 1606, 1607 and 1608 are the same as those in the first connection restriction method described above. From the predicted transmission power information output by the predicted transmission power acquisition unit (1604) and the predicted transmission power total value information stored in the predicted transmission power total value storage unit (1801), the predicted transmission power total value update unit (1802). Calculates the predicted transmission power total value when the connection is permitted. The total value output by the predicted transmission power total value update unit (1802) and the threshold value output by the predicted transmission power total value threshold value determination unit (1803) are compared with 1606 to determine whether or not the terminal can be connected.

Claims (17)

  1. A connection limiting method in a communication system that has a base station and a plurality of terminals, and controls transmission power of transmission in which signals from each terminal are multiplexed at at least one frequency,
    When a terminal requesting the start of data communication starts communication, the estimated transmission power required for signal transmission from the terminal is estimated, and whether or not connection for the communication is determined based on the estimated predicted transmission power Connection limit method to be determined.
  2. The connection restriction method according to claim 1,
    The terminal estimates the predicted transmission power, notifies the base station of the predicted transmission power and connection request,
    The connection restriction method in which the base station determines whether or not the connection is possible based on the notified predicted transmission power.
  3. The connection restriction method according to claim 1,
    The connection restriction method in which the base station receives notification of transmission power information when the terminal is not transmitting data, and estimates the predicted transmission power based on communication information desired by the terminal.
  4. The connection restriction method according to claim 1,
    A connection restriction method for determining whether or not connection is possible at the frequency based on a comparison result between a predetermined threshold and predicted transmission power.
  5. The connection restriction method according to claim 4,
    A connection restriction method for determining the threshold based on a load state of the base station.
  6. A connection control method in a communication system that has a base station and a plurality of terminals, and controls transmission power of transmission in which signals from each terminal are multiplexed at at least one frequency,
    A connection restriction method for determining whether or not a new connection can be made at a frequency based on the total transmission power of terminals communicating at a certain frequency.
  7. A terminal used in a wireless communication system that has a base station and a plurality of terminals and controls uplink transmission power,
    A transmission power control information extraction unit that extracts transmission power control information received from the base station;
    A transmission power updating unit that controls transmission power based on the transmission power control information received in response to a control signal transmitted before starting connection for data communication;
    A transmission power prediction unit that predicts transmission power using the received transmission power control information;
    A control unit that transmits to the base station and generates connection request information used for connection control,
    Whether the connection is possible is determined using the predicted transmission power.
  8. The terminal according to claim 7, wherein
    The control unit transmits the connection request information and the predicted transmission power to the base station, and controls the start of connection for the connection request based on connection availability information notified from the base station. Terminal.
  9. The terminal according to claim 7, wherein
    The terminal, wherein the control unit does not transmit the connection request information to the base station if the predicted transmission power exceeds a predetermined threshold.
  10. The terminal according to claim 9, wherein
    The terminal characterized in that the threshold is determined based on a load situation of the base station.
  11. The terminal according to claim 10, wherein
    A terminal characterized in that the load status of the base station is the sum of transmission powers of a plurality of terminals receiving uplink communication in the base station.
  12. A base station having a base station and a plurality of terminals, used for a radio communication system for controlling uplink transmission power for each terminal,
    A connection request notification extracting unit for extracting a connection request notification for transmitting data from the terminal;
    A control unit for controlling connection of the terminal based on the connection request notification;
    A transmission power control signal generation unit that generates a transmission power control signal used for transmission power control of a signal transmitted from the terminal, and outputs the generated transmission power control signal to the terminal, and
    The transmission power control signal generation unit controls transmission power from the terminal before and after connection for data transmission of the terminal,
    The base station characterized in that the connection control is performed based on predicted transmission power after connection of the terminal predicted based on transmission power control before connection for data transmission from the terminal.
  13. The base station according to claim 12, comprising:
    The control unit determines whether or not the terminal can be connected based on the predicted transmission power received from the terminal.
  14. The base station according to claim 13, wherein
    The base station, wherein the control unit rejects connection of the terminal when the predicted transmission power received from the terminal exceeds a predetermined threshold.
  15. The base station according to claim 13, wherein
    The base station is characterized in that the threshold is set based on a reception load situation in the base station.
  16. A base station having a base station and a plurality of terminals, used for a radio communication system for controlling uplink transmission power for each terminal,
    A connection request notification extracting unit for extracting a connection request notification for transmitting data from the terminal;
    A control unit for controlling connection of the terminal based on the extracted connection request notification;
    A transmission power control signal generation unit that generates a transmission power control signal used for controlling transmission power of transmission from the terminal, and outputs the generated transmission power control signal to the terminal, and
    The base station characterized in that the connection control determines whether or not the terminal can be connected based on a total value of transmission power of a plurality of terminals received by the base station.
  17. The base station according to claim 16, wherein
    The control unit rejects a new connection from the terminal when a total value of transmission power of terminals received by the base station exceeds a predetermined threshold.
JP2008517770A 2006-05-30 2006-05-30 Mobile communication system connection control method and base station apparatus Expired - Fee Related JP4806709B2 (en)

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WO2013164895A1 (en) * 2012-05-02 2013-11-07 Yamamoto Kazuhiro Wireless base station
JP6403411B2 (en) * 2014-04-01 2018-10-10 国立研究開発法人情報通信研究機構 Wireless communication method
JP6301225B2 (en) * 2014-09-24 2018-03-28 Kddi株式会社 Base station apparatus, communication method, and communication system

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