WO2007138714A1 - Mobile communication system connection regulation method, base station device, and terminal device - Google Patents

Mobile communication system connection regulation method, base station device, and terminal device Download PDF

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Publication number
WO2007138714A1
WO2007138714A1 PCT/JP2006/311175 JP2006311175W WO2007138714A1 WO 2007138714 A1 WO2007138714 A1 WO 2007138714A1 JP 2006311175 W JP2006311175 W JP 2006311175W WO 2007138714 A1 WO2007138714 A1 WO 2007138714A1
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WO
WIPO (PCT)
Prior art keywords
transmission power
terminal
connection
base station
based
Prior art date
Application number
PCT/JP2006/311175
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French (fr)
Japanese (ja)
Inventor
Toshiyuki Saito
Mikio Kuwahara
Daigo Takayanagi
Original Assignee
Hitachi Communication Technologies, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hitachi Communication Technologies, Ltd. filed Critical Hitachi Communication Technologies, Ltd.
Priority to PCT/JP2006/311175 priority Critical patent/WO2007138714A1/en
Publication of WO2007138714A1 publication Critical patent/WO2007138714A1/en

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Classifications

    • 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

Provided is a connection regulation method for a mobile communication. When deciding whether a terminal can be received, a prediction value of transmission power when communication is started is acquired and compared to a threshold value, so that the connection is regulated according to the comparison result. Transmission power in the state when no data is transmitted is calculated at the terminal side and transmission power during data transmission is predicted and reported to a base station. Thus, the base station can predict a terminal which cannot receive communication unless the transmission power is above a predetermined value, thereby regulating the connection.

Description

 Connection restriction method for mobile communication system, base station apparatus and terminal apparatus

Technical field

 The present invention relates to a connection control method for a wireless communication system, and more particularly to a connection control method that is preferably applied to a mobile communication system.

 Light

 Fine 1

 Background art

 Figure 1 shows the system configuration of the present invention. A plurality of mobile stations 1 0 3, 1 0 4, 1 0 5 and 1 0 6 communicate with the base stations 1 0 1 and 1 0 2 via radio. Base stations 1 0 1 and 1 0 2 are controlled by a base station control station 1 0 7, and communicate between the mobile stations, or between a mobile station and a communication device belonging to the fixed network 1 0 8. Is established. When communication is established between a mobile station and a communication device belonging to the fixed network 1 0 8, some of the mobile stations to which it belongs are selected.

 In such a wireless communication system, in order to improve the throughput of communication from the base station to the terminal, means for preferentially selecting a terminal that belongs to the same base station and has a high communication speed ( Scheduling) is known. For example, A. Jalali, R. Padovani, and R. Pankaj, Data throughput of CDMA-HDR a high efficiency-high data personal communication wireless system "" Γ C-Spring 2000, Tokyo, Japan, May 2000 Notify each measured transmission path status in the form of the maximum receivable transmission rate, and determine the terminal whose transmission ratio is the maximum ratio between the maximum receivable transmission rate and the average rate in the past predetermined period as the transmission target. By doing so, a technology for improving the throughput of the base station while ensuring fairness between terminals is disclosed.

In addition, in order to improve the throughput of communication from the terminal to the base station, the same base Stations and terminals belonging to the same frequency are known to perform code multiplex communication independently 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. Figure 2 shows this control procedure.

 The base station that has received the pilot signal or data signal (2 0 1) transmitted from the terminal calculates the SIR of the received signal (2 0 2) and decodes the data (2 0 3). Then, a transmission power control signal (2 0 4) corresponding to the calculated SIR value is generated and notified to the terminal. When calculating SIR using a pilot signal whose transmission power is known, the φ propagation path attenuation is estimated for the terminal from the SIR, and uplink data is transmitted with a transmission power value considering the propagation path attenuation. In addition, the terminal is controlled by the transmission power control signal. Or, when calculating the SIR of a data signal, control the transmission power for the next data transmission (decrease, increase, or maintain the transmission power) depending on whether the SIR is sufficient or not. It is better to transmit the instruction as a transmission power control signal. In addition, the base station transmits A C K or Ν Κ た corresponding to the data decoding result to the terminal. The terminal that has received the transmission power control signal controls the power to transmit the data signal accordingly (2 06). Various methods are already well known for uplink transmission power control in CDMA communication and the like.

 Consider the case where mobile stations 1 0 3, 1 0 4, and 1 0 5 communicate with the base station 1 0 1 at the same frequency in a situation where code multiplex communication is performed in this way. Since the orthogonality of the code may not be maintained due to synchronization loss or the like, interference power on the base station side increases due to communication of other terminals, and communication quality deteriorates.

On the base station side, the reception quality k of a signal from a certain terminal is defined as follows: S is the direct signal power at the base station side, I is the total received power originating from terminals other than the terminal, and N is the thermal noise power. Then, it is expressed by equation (1). k = — ·-· (1) Furthermore, 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 in the base station. The k =-~~... (2)

 (n-l) rS / PG_SS + N Therefore, the total received power P t of the base station is expressed by Equation (3). The received power P t diverges with the number of connections n expressed by Equation (4).

 -m λ

 Pt = nrS + N = ―—— -—— +1 N · · (3),

 1 / k- r (n- / PG—SS

PG SS,,

η = ~ = ~ +1 (4) In the 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 satisfies the desired received power S However, there is a problem that the reception quality k deteriorates. For this problem, the received power at the base station side

A method is known to prevent n from exceeding a certain level by controlling Pt and restricting the connection of new terminals when Pt exceeds a set threshold (special 2002-2). 1 See 7956). If the same communication is performed at multiple frequencies, a terminal whose connection is restricted at a certain frequency may attempt 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 on the transmission power of the terminal, so that the transmission power that satisfies the desired received pilot power S in Equation (1) cannot be achieved.

Control that focuses on the transmission power of the terminal. When the transmission power exceeds a certain level, the transmission is stopped on the terminal side to prevent waste of transmission power and interference with other terminals. A method is known (see Japanese Patent Laid-Open No. 2000-290-26). Disclosure of the invention

 Since the control based on the received power on the base station side (see Japanese Patent Laid-Open No. 2 0 0 2-2 1 7 9 5 6) can only refer to the received value via the radio propagation path, the terminal side There was a problem that it was impossible to predict the deterioration of connection quality due to the lack of transmission power. These terminals not only fail to achieve the desired communication quality, but also interfere with other terminals' communication by communicating with the maximum transmission power, so it is necessary to regulate connections.

 In addition, communication with the upper limit transmission power can be avoided by a method that stops transmission when the transmission power exceeds a certain level (see Japanese Patent Laid-Open No. 2 0 0 2-2 9 0 3 2 6). However, there is a problem that communication quality deteriorates when transmission is stopped. In the first place, it is necessary to regulate the connection of terminals whose transmission power is near 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 request to start communication is received from a terminal, an expected value of average transmission power when the terminal performs the communication is acquired, and the acquired expected value is compared with a threshold value. To decide 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. As a result, it is expected that the terminal avoids charging due to communication less than the desired quality and achieves the desired communication quality by using other frequencies.

In addition, on the system side, the terminal that cannot achieve the desired communication quality It is possible to prevent interference with other terminals by communicating with the terminal. Brief Description of Drawings

 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 regulation 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 control 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 the second method for determining whether to accept a terminal 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 regulating method of the present invention.

 FIG. 11 is a flowchart of the operation of the terminal of the second connection control method of the present invention. FIG. 12 is a flowchart of the operation of the base station of the second connection control 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 flowchart of an operation flow on the base station side of the second method for determining whether to accept terminals according to 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 diagram of the base station-side radio communication device according to the first and second connection restriction methods of the present invention. It is a block diagram of a configuration example.

 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 wireless communication device according to the second terminal acceptability determination method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 FIG. 3 shows a control sequence of the first connection control method of the present invention. A terminal desiring to start communication first controls transmission power in a state where data is not transmitted (3 0 1), and calculates transmission power in a state where data is not transmitted. Next, the transmission power when transmitting data is predicted based on the transmission power in the state where data is not transmitted and the data rate of communication (3 0 2). Notify the base station (3 0 3).

 The base station determines whether or not to start communication based on the notified predicted power (3 0 4), and notifies the terminal of information on whether or not the communication is accepted (3 0 5). If it is acceptable, the connection setup procedure is performed after this, 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 3 0 1 in a state where data is not transmitted. For example, transmission power control as shown in FIG. 2 is performed. It should be noted that the determination of acceptability of terminals (3 0 4) may be combined with control based on the load on the base station. Also, the transmission power used for prediction in transmission power prediction (3 0 2) may use a value of several% from the beginning when instantaneous values are arranged in descending order.

In transmission power control 3 0 1 in a state where data is not transmitted, for example, a control signal for transmission power control transmitted from a terminal to a base station and a Z or uplink pilot signal are used. The base station receives the signal from the terminal and measures the received power, and increases the transmission power (for example, with the goal of equalizing the signal received power from each terminal). Instruct the terminal to make it lower or lower. Alternatively, when the transmission power of the control signal from the terminal and / or the uplink pilot signal is known at the base station, attenuation in the propagation path is obtained from the reception power at the base station. For this reason, it is also possible to calculate the transmission power required to match the target reception power and notify each terminal of the required transmission power.

 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). Further, 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 cause interference with other terminals when the connection is permitted, or the connection of terminals that cannot actually perform data communication efficiently because the communication path status is poor even if the connection is permitted. Can be suppressed.

 As the transmission power prediction (3 0 2) when data is transmitted, for example, the final control result value of the transmission power control (3 0 1) 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 (3 0 3) notified by the terminal with the threshold (4 0 1) related to the transmission power, and the terminal (4 0 1) that is likely to start communication with a transmission power equal to or lower than the threshold. 2) Permits acceptance, and controls to reject acceptance of terminals (4 0 3) that are expected to communicate with transmission power exceeding the threshold, thereby accepting terminals that communicate with transmission power close to the upper limit. To avoid. Note that the threshold (4 0 1) need not be fixed. For example, the threshold value may be changed in conjunction with the received power of the base station.

Figure 3 shows the operation for a new connection (call) and handover of a 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 transmission power control 301 is started with the incoming call processing 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 was obtained during the period of constant transmission power control (902) that started transmission power control (902) in the state of not transmitting data, triggered by the occurrence of communication start (901) as a trigger. Based on the transmission power information, the transmission power during communication is predicted (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 desired connection and predicted transmission power is received from the terminal (101, 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 less than or equal to the threshold, the terminal accepts the connection (1004), and if the notified transmission power exceeds the threshold, the terminal rejects the connection (1005) and The determined acceptance / rejection information is notified to the terminal side (1006).

 FIG. 15 shows the configuration of the wireless communication device on the terminal 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 the radio frequency circuit (1501), and the 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 previous transmission stored in the transmission power information storage unit (1 503), the transmission power update unit (1504) transmits the next transmission Determine the power.

The transmission power control unit (1 508) uses the updated transmission power to transmit the next transmission data or control signal (however, the transmission power is controlled using an uplink pilot signal with a constant transmission power). In this case, the pilot signal is transmitted without going through the transmission power control unit. If a connection is desired, the control unit (15 05) determines when to notify the connection request, transmits a connection request notification (1507), and transmits the previous transmission stored in the transmission power information storage unit (1 503). Transmission power information and timing based on the communication information obtained from the control unit (1505) 5 0 6) predicts the transmission power during communication and notifies the base station.

 The power control signal extraction unit (1 5 0 2), the transmission power information storage unit (1 5 0 3), the transmission power update unit (1 5 0 4) and the transmission power control unit (1 5 0 8) It is commonly used for transmission power control of control signals.

 FIG. 16 shows the configuration of the 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 the radio frequency circuit (1 6 0 1), and the communication information desired to be connected is extracted by the connection request notification extraction unit (1 6 0 2). The transmission power information extraction unit (1 6 0 3) extracts predicted transmission power information during communication. The predicted transmission power acquisition unit (1 6 0 4). Inputs the predicted transmission power information obtained by the transmission power information extraction unit (1 6 0 3) to the connection availability determination unit (1 6 0 6). The predicted transmission power threshold value determination unit (1 6 0 5) sets a threshold value based on the received power of the base station and inputs it to the connection availability determination unit (1 6 0 6). The connectability determination unit (1 6 0 6) includes the predicted transmission power input from the predicted transmission power acquisition unit (1 6 0 4) and the threshold value input from the predicted transmission power threshold value determination unit (1 6 0 5). To determine whether the terminal can be connected or not, and informs the terminal of the determined connection permission information (1 6 0 7). In order to control the transmission power from the terminal, the transmission power control signal generation unit (1 6 0 8) measures the reception SIR of the data signal received from the terminal or the received control signal, and transmits the transmission according to the reception SIR. A power control signal is generated, and the generated transmission power control signal is transmitted to the terminal.

 FIG. 5 shows a control sequence of the second connection control method of the present invention. The operations of 3 0 1, 3 0 4 and 3 0 5 are the same as those in 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 (5 0 1), and the base station is transmitting data based on the notified power information and data rate information. Predict the transmission power of (5 0 2).

FIG. 11 shows a flowchart of the operation of the terminal in the second connection regulation method of the present invention. The operations of 9 0 1, 9 0 2 and 9 0 4 are the same as those in the first connection restriction method described above. . The second method is different from the first method described above in that the transmission power information in a state where no data is transmitted is notified to the base station as it is (1 101).

 FIG. 12 shows a flowchart of the operation of the base station in the second connection regulation method of the present invention. The operations of 1001, 1003, 1004, 1005 and 1006 are the same as the first connection regulation method described above. Receives transmission power information notification in a state in which no data is transmitted from the terminal (1201), transmission power during communication based on communication information notified in connection request (1001) and 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 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 in FIG. The transmission power information extraction unit (1603) extracts the predicted transmission power information when communication is not performed, and the predicted transmission power acquisition unit (1604) is obtained by the transmission power information extraction unit (1603). Based on the received transmission power information and the communication information obtained by the connection request notification extraction unit (16 02), the transmission power during communication is predicted, and the prediction result is input to the connection availability determination unit (1606). .

 FIG. 7 shows a control sequence of the third connection regulation method of the present invention. The operations of 301 and 302 are the same as the first method described above. The base station notifies the terminal of the current load status (70 1). 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 an operation flowchart of the terminal of the third connection regulation method of the present invention. The operations of 901, 902, and 903 are the same as those in the first connection restriction 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 transmission power prediction (903) is compared with the threshold value determined in 1302 (1303). If the predicted transmission power is less than the threshold value, the execution of the connection request is determined (1 304) If the predicted transmission power exceeds the threshold value, it decides to cancel the connection request (1305).

 In transmission power threshold determination 1302, for example, when the load on the base station is higher, the transmission power threshold may be set lower. This is because if the base station load is already high, it is better to restrict the connection of terminals with high required transmission power more strictly.

 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 1 501, 1 502, 1 503, 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 (1-701) extracts the base station load information from the output signal of the radio frequency circuit (1 50 1). 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 value output from the transmission power threshold determination unit (1 702), and determines the connection request ( 1) Determine whether or not 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 regulated based on the total value of the predicted transmission power (30 3) notified by the terminal for all terminals. The more terminals that are communicating in a poor wireless environment, the greater the total predicted power. The total value of the predicted transmission power for all terminals is compared with the threshold (401) for the total value. If the total value is less than the threshold value (802), all new connections are accepted and the total value is Threshold If exceeded (803), all new connections will be 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 in the second method for determining whether to accept a terminal. The operation of 1001 and 1002 is the same as the first connection control method described above. Based on the predicted transmission power notified in 1002, the total predicted power value for all terminals when connection is permitted is predicted (1401). The predicted total value is compared with the threshold value, and if the total value is less than the threshold value, the terminal connection is accepted (14 02), and if the luxury position exceeds the threshold value, the terminal connection rejection is decided ( 1403).

 FIG. 18 shows the configuration of the base station-side radio communication device relating to the second method of determining whether to accept terminals according to the present invention. The operations of 1 601, 1602, 1603, 1604, 1606, 1 607 and 1 608 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 combined 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

The scope of the claims
 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 on 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 possible based on the estimated predicted transmission power Determine how to limit connections.
 2. The connection limiting method according to claim 1, wherein the terminal estimates the predicted transmission power, notifies the base station of the predicted transmission power and a 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, wherein
 The base station receives a 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, wherein
 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, wherein
 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 having a base station and a plurality of terminals and controlling uplink transmission power,
 A transmission power control information extracting unit for extracting transmission power control information received from the base station;
 A transmission power update unit that controls transmission power based on the transmission power control information received in response to a control signal transmitted before the start of connection for data communication, and the received transmission power control information. A transmission power prediction unit for predicting transmission power by
 A control unit that generates connection request information that is transmitted to the base station and used for connection control, and
 Whether the connection is possible is determined using the predicted transmission power.
 8. A terminal according to claim 7,
 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 the connection availability information notified from the base station. Characteristic terminal.
 9. A terminal according to claim 7,
 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.
1 0. The terminal of claim 9,
 The terminal characterized in that the threshold is determined based on a load situation of the base station.
 1 1. The terminal according to claim 10,
 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.
1 2. It has a base station and a plurality of terminals, and each terminal transmits uplink transmission power. A connection request notification extracting unit that extracts a connection request notification for transmitting data from the terminal;
 Based on the connection request notification, a control unit that controls connection of the terminal and a transmission power control signal used for transmission power control of a signal transmitted from the terminal are generated, and the generated transmission power control is performed. A transmission power control signal generation unit for outputting a 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, which is predicted based on transmission power control before connection for data transmission from the terminal.
A base station according to claim 1 2, comprising:
 The control unit determines whether or not the terminal can be connected based on the predicted transmission power received from the terminal.
A base station according to claim 13, comprising:
 The control unit rejects connection of the terminal when the predicted transmission power received from the terminal exceeds a predetermined threshold.
A base station according to claim 13, comprising:
 The base station is characterized in that the threshold is set based on a reception load situation in the base station.
A base station used in a radio communication system having a base station and a plurality of terminals and controlling uplink transmission power for each of the terminals,
 A connection request notification extracting unit for extracting a connection request notification for transmitting data from the terminal;
A control unit that controls connection of the terminal based on the extracted notification of desired connection When,
 A transmission power control signal generation unit that generates a transmission power control signal used to control 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. A base station according to claim 16, comprising:
 The base station characterized in that 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.
PCT/JP2006/311175 2006-05-30 2006-05-30 Mobile communication system connection regulation method, base station device, and terminal device WO2007138714A1 (en)

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WO2013164895A1 (en) * 2012-05-02 2013-11-07 Yamamoto Kazuhiro Wireless base station
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