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WO2007138714A1 - Procédé de régulation de connexion d'un système de communication mobile, dispositif de station de base et dispositif terminal - Google Patents

Procédé de régulation de connexion d'un système de communication mobile, dispositif de station de base et dispositif terminal 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
Authority
WO
WIPO (PCT)
Prior art keywords
transmission power
terminal
connection
base station
predicted
Prior art date
Application number
PCT/JP2006/311175
Other languages
English (en)
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.)
Filing date
Publication date
Application filed by Hitachi Communication Technologies, Ltd. filed Critical Hitachi Communication Technologies, Ltd.
Priority to PCT/JP2006/311175 priority Critical patent/WO2007138714A1/fr
Priority to JP2008517770A priority patent/JP4806709B2/ja
Publication of WO2007138714A1 publication Critical patent/WO2007138714A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/223—TPC being performed according to specific parameters taking into account previous information or commands predicting future states of the transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • Connection restriction method for mobile communication system for mobile communication system, base station apparatus and terminal apparatus
  • 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.
  • 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.
  • the same base Stations and terminals belonging to the same frequency are known to perform code multiplex communication independently using different codes.
  • 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.
  • the ⁇ 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.
  • the terminal is controlled by the transmission power control signal.
  • the base station transmits A C K or ⁇ ⁇ ⁇ 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.
  • Equation (3) 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).
  • 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
  • the reception quality k deteriorates.
  • 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.
  • 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.
  • 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.
  • 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.
  • the terminal avoids charging due to communication less than the desired quality and achieves the desired communication quality by using other frequencies.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 3 shows the operation for a new connection (call) and handover of a terminal.
  • 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.
  • 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).
  • the transmission power update unit (1504) 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).
  • 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.
  • 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).
  • 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).
  • 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.
  • 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.
  • the predicted transmission power total value update unit (1802) 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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de régulation de connexion destiné à une communication mobile. En décidant si un terminal peut être reçu, une valeur prévisionnelle de la puissance lorsque la communication est commencée est acquise et comparée à une valeur seuil, de sorte que la connexion est régulée selon le résultat de comparaison. La puissance de transmission dans l'état en l'absence de transmission de données est calculée au côté terminal et la puissance de transmission pendant la transmission de données est prédite et rapportée à une station de base. Ainsi, la station de base peut prévoir un terminal qui ne peut pas recevoir de communication à moins que la puissance de transmission soit supérieure à une valeur prédéterminée, régulant ainsi la connexion.
PCT/JP2006/311175 2006-05-30 2006-05-30 Procédé de régulation de connexion d'un système de communication mobile, dispositif de station de base et dispositif terminal WO2007138714A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2006/311175 WO2007138714A1 (fr) 2006-05-30 2006-05-30 Procédé de régulation de connexion d'un système de communication mobile, dispositif de station de base et dispositif terminal
JP2008517770A JP4806709B2 (ja) 2006-05-30 2006-05-30 移動通信システムの接続制御方法及び基地局装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/311175 WO2007138714A1 (fr) 2006-05-30 2006-05-30 Procédé de régulation de connexion d'un système de communication mobile, dispositif de station de base et dispositif terminal

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Cited By (5)

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JP2011524683A (ja) * 2008-06-16 2011-09-01 マーベル ワールド トレード リミテッド 近距離無線通信
WO2013164895A1 (fr) * 2012-05-02 2013-11-07 Yamamoto Kazuhiro Station de base sans fil
WO2015151423A1 (fr) * 2014-04-01 2015-10-08 独立行政法人情報通信研究機構 Procédé de communication sans fil
US9198127B2 (en) 2010-10-25 2015-11-24 Yamamoto Kazuhiro Communication device
JP2016066894A (ja) * 2014-09-24 2016-04-28 Kddi株式会社 基地局装置、端末装置、通信方法、および通信システム

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Publication number Priority date Publication date Assignee Title
JP2011524683A (ja) * 2008-06-16 2011-09-01 マーベル ワールド トレード リミテッド 近距離無線通信
US9198127B2 (en) 2010-10-25 2015-11-24 Yamamoto Kazuhiro Communication device
WO2013164895A1 (fr) * 2012-05-02 2013-11-07 Yamamoto Kazuhiro Station de base sans fil
WO2015151423A1 (fr) * 2014-04-01 2015-10-08 独立行政法人情報通信研究機構 Procédé de communication sans fil
JP2015198333A (ja) * 2014-04-01 2015-11-09 国立研究開発法人情報通信研究機構 無線通信方法
CN106134244A (zh) * 2014-04-01 2016-11-16 国立研究开发法人情报通信研究机构 无线通信方法
US10080241B2 (en) 2014-04-01 2018-09-18 National Institute Of Information And Communications Technology Radio communication method
CN106134244B (zh) * 2014-04-01 2019-10-25 国立研究开发法人情报通信研究机构 无线通信方法
JP2016066894A (ja) * 2014-09-24 2016-04-28 Kddi株式会社 基地局装置、端末装置、通信方法、および通信システム

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