WO2002054817A1 - Appareil radio, procede de commande de puissance d'emission, et programme de commande de puissance d'emission - Google Patents

Appareil radio, procede de commande de puissance d'emission, et programme de commande de puissance d'emission Download PDF

Info

Publication number
WO2002054817A1
WO2002054817A1 PCT/JP2001/011314 JP0111314W WO02054817A1 WO 2002054817 A1 WO2002054817 A1 WO 2002054817A1 JP 0111314 W JP0111314 W JP 0111314W WO 02054817 A1 WO02054817 A1 WO 02054817A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
signal
reception level
transmission power
call
Prior art date
Application number
PCT/JP2001/011314
Other languages
English (en)
Japanese (ja)
Other versions
WO2002054817A8 (fr
Inventor
Yoshiharu Doi
Original Assignee
Sanyo Electric Co., 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 Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Publication of WO2002054817A1 publication Critical patent/WO2002054817A1/fr
Publication of WO2002054817A8 publication Critical patent/WO2002054817A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control

Definitions

  • Wireless device transmission power control method and transmission power control program
  • the present invention relates to a configuration for controlling a transmission output of a terminal communicating with a radio base station, and particularly to a configuration for controlling a transmission output of a terminal communicating with an adaptive array radio base station.
  • the communication system of the PHS (Personal Handy-phone System), which has been widely used in recent years, is a TDMA that uses one frame (5 ms) consisting of four slots (one slot: 625 / iS) for transmission and reception as a basic unit (Time Division Multiple Access) method is adopted.
  • a PHS communication method is standardized as a “second generation codeless call system”.
  • This PHS performs an undesired wave (U-wave) measurement process during the control procedure for establishing synchronization.
  • the U-wave measurement is disclosed in detail in the PHS standard, 2nd generation codeless communication system standard RCR STD-28 (published by: The Radio Industry).
  • FIG. 6 is a diagram showing such a U-wave measurement processing sequence flow.
  • a link channel establishment request signal (LCH establishment request signal) is transmitted from the PHS terminal to the base station using the C channel (control channel: CCH).
  • the PHS base station detects a vacant channel (vacant T channel) (carrier sense), and transmits a link channel assignment signal (LCH assignment signal) specifying a vacant T channel using the C channel to the PHS terminal side.
  • the PHS terminal Based on the link channel information received from the PHS base station, the PHS terminal measures whether or not an interference wave signal with a certain power or more is received on the specified T channel (u-wave measurement). If the above interference signal is not detected, That is, if another PHS base station does not use this designated T channel, the base station transmits a synchronization burst signal to the base station using the designated channel, thereby completing the synchronization establishment.
  • the communication channel is connected between the terminal and the base station by using a channel with a small interference wave and a good communication characteristic 14.
  • SDMA Spatial Division Multiple Access
  • an adaptive array using an array antenna is used as a base station.
  • the operation principle of such an adaptive array radio base station is described in, for example, the following document.
  • the radio waves transmitted and received by the adaptive array have directivity in a predetermined direction, it is possible to direct the radio area toward the mobile terminal.
  • the same channel can be assigned to multiple users within the same senor, as described in the literature: “Blockage rate characteristics of the SDMA method using a three-element adaptive array.” Techniques A. P97-214, RCS97-252, MW97-197 (1998-02) (published by: The Institute of Electronics, Information and Communication Engineers), etc.
  • the SDMA method is based on PDMA (Path Division Multiple Multiple Access). Access) method.
  • FIG. 7 is a conceptual diagram showing a terminal communicating with the SDMA base station. As shown in FIG. 7, by using the SDMA communication technology for a PHS base station using an adaptive array, one SDMA—PHS base station 71 can accommodate a plurality of PHS terminals PA to PF. It becomes possible.
  • FIG. 8 is a conceptual diagram showing radio wave directivity when the above-described SDMA-PHS base station 71 transmits and receives data to and from the PHS terminal PS1.
  • FIG. 9 is a schematic diagram schematically showing the operation principle of such an adaptive array radio base station.
  • one adaptive array radio base station 1 is provided with an array antenna 2 composed of ⁇ antennas # 1, # 2, # 3,..., # ⁇ . It is represented as the shaded area 3 of 1.
  • the range in which the radio wave of another adjacent wireless base station 6 can reach is represented as a second hatched area 7.
  • radio signals are transmitted and received between the mobile phone 4 as the terminal of the user ⁇ and the adaptive array radio base station 1 (arrow 5).
  • power is transmitted between the mobile phone 8, which is the terminal of the other user B, and the wireless base station 6.
  • Wave signals are transmitted and received (arrow 9).
  • the frequency of the radio signal of the mobile phone 4 of the user A happens to be equal to the frequency of the radio signal of the mobile phone 8 of the user B, depending on the position of the user B, the mobile phone 8 of the user B
  • the radio signal becomes an unnecessary interference signal in the area 3, and is mixed into the radio signal between the mobile phone 4 of the user A and the adaptive array radio base station 1.
  • the signals from both the users A and B are mixed unless any processing is performed.
  • the signal is received, and the call of User A, who should be talking, is interrupted.
  • the adaptive array radio base station 1 performs the following configuration and processing in order to remove the signal from the user B from the received signal.
  • FIG. 10 is a block diagram showing the configuration of the adaptive array 100.
  • n input ports 20-1 to 2 ⁇ -n are provided to extract a desired user signal from an input signal including a plurality of user signals.
  • the signals input to the respective input ports 20—l to 20_n are connected to the weight vector control unit 11 and the multipliers 1 2—l to 1 2 through the switch circuits 1-1 to 10_n. _n.
  • Weight base vector control unit 1 using the training signals corresponding to the signal of a particular user is stored in advance in the memory 1 4 between the input signal and the output of the adder 1 3, the weight vector w li ⁇ wn i Is calculated.
  • the subscript i indicates that it is a weight vector used for transmission and reception with the i-th user.
  • the multipliers 1 2— 1 to 1 2—n multiply the input signals from the input ports 20—1 to 20—n by the weight vectors w li to wni, respectively, and provide the result to the adder 13 .
  • the adder 13 adds the output signals of the multipliers 1 2—1 to 1 2—n and outputs the sum as a received signal S RX (t).
  • the received signal S RX (t) is output by the weight vector controller 1 1 is also given.
  • the adaptive array 10 ⁇ is connected to the adaptive array radio base station 1.
  • the weight vector control unit 11 multiplies each and the weight base vector wli ⁇ wn i given by including the multiplier 15-1 to 1 5-n to be output.
  • the outputs of the multipliers 15-1 to 15-n are supplied to the switch circuits 101-1 to 10-n, respectively.
  • the switch circuits 10-1 to 10-n supply the signals supplied from the input ports 20-1 to 20_n to the signal receiving unit 1R when receiving a signal, and transmit the signals when transmitting a signal.
  • the signal from the signal transmission unit 1T is supplied to the input / output ports 20-1 to 20-n.
  • RX 3 (t) h 31 Srx 1 (t) + h 32 Srx 2 (t) + n 3 (t)-(3)
  • RX 4 (t) h 41 Srx 1 (t) + h 42 Srx 2 (t) + n 4 (t)... (4)
  • the coefficient hji indicates the complex coefficient of the signal from the i-th user received by the j-th antenna
  • nj (t) indicates the noise included in the j-th received signal.
  • N (t) [n 1 (tn 2 (t), ... ) n n (t)] T 8)
  • X (t) is the input signal vector and Hi is the received signal coefficient of the i-th user.
  • the vector and N (t) indicate the noise vector, respectively.
  • the adaptive array antenna multiplies the input signals from the respective antennas by weighting factors wli to wni and outputs a signal as a received signal S RX (t).
  • the number n of antennas is four.
  • the output signal y 1 (t) of the adaptive array .100 can be expressed by the following equation by multiplying the input signal vector X (t) and the vector of the weight vector W1.
  • yl (t) X (t) W 1 T- (9)
  • yl (t) Hj W ⁇ Srx! (t) + ⁇ 2 ⁇ ⁇ 8 ⁇ 2 (t) + N (t)... (11)
  • ⁇ t) n ⁇ Wu + n 2 (t) w 21 + n 3 (t) w 31 + ⁇ 4 (t) W 41 - (15) i.e., the output signal y 1 (t), 2 person First user of the user Then, the signal S r xl (t) transmitted by the above is obtained.
  • the input signal STX (t) to the adaptive array 100 is given to the transmission unit 1T in the adaptive array 100, and the multipliers 15-1, 15-2, 15-3,. , 1 5—n to one input.
  • the other inputs of these multipliers are copied with weight vectors wli, w2i, w3i,..., Wni calculated by the weight vector control unit 11 based on the received signal as described above. And applied.
  • the input signals weighted by these multipliers are passed through the corresponding switches 10-1, 10-2, 10-3,..., 10—n to the corresponding antennas # 1, # 2, # 3,..., It is sent to #n and sent in area 3 shown in FIG.
  • a radio signal of a mobile phone is mainly composed of a preamble consisting of a base signal sequence for a radio base station and data (such as voice) consisting of a signal sequence known to the radio base station.
  • the preamble signal sequence includes a signal sequence of information for identifying whether the user is a desired user to talk to the radio base station.
  • the weight vector control unit 11 of the adaptive array radio base station 1 compares the training signal corresponding to the user A extracted from the memory 14 with the received signal sequence, and generates a signal sequence corresponding to the user A. Weight vector control (determination of weighting factors) is performed so as to extract signals considered to be included.
  • FIG. 11 is a diagram illustrating transmission and reception of radio signals between user A and the adaptive array radio base station 1.
  • the signal transmitted using the same array antenna 2 as that at the time of reception is weighted targeting user A in the same way as the received signal, so that the transmitted radio signal is directed as if it were directed to user A. It is received by the mobile phone 4 of the user A as if the mobile phone 4 had the property.
  • the adaptive array antenna is properly applied to the area 3 indicating the range where radio waves can reach from the adaptive array radio base station 1 as shown in Fig. 11.
  • a radio signal is output under control, a radio signal having directivity that targets mobile phone 4 of user A is output from adaptive array radio base station 1 as shown in area 3 a of FIG. 11. Will be done.
  • the adaptive array wireless base station 1 can transmit and receive a radio signal having directivity to a specific user as a target, as described below. It is possible to realize a simple spatial multiplexing mobile communication system (SDMA).
  • SDMA simple spatial multiplexing mobile communication system
  • the terminal during a call is basically moving, and the status of the communication path with the base station during the call is constantly changing. For this reason, for example, if the reception condition between the base station and the communicating base station deteriorates when viewed from a certain terminal that is talking to the base station, the transmission power for communication on the terminal side is increased. Need to be controlled.
  • the terminal side evaluates the reception state based on the reception level of radio waves used for a call, the signal error rate, and the like.
  • An object of the present invention is to provide a wireless device capable of maintaining a good communication state without adversely affecting a communication state of another user.
  • Another object of the present invention is to provide a transmission power control method for a wireless device capable of maintaining a good communication state without adversely affecting a communication state of another user.
  • Still another object of the present invention is to provide a program for a computer which performs transmission power control of a wireless device capable of maintaining a good communication state without adversely affecting a communication state of another user. That is.
  • the present invention communicates with a selected one of a plurality of base stations.
  • a control unit for controlling the operation of the wireless device, a receiving unit for receiving radio waves from the base station and extracting a corresponding signal, and The control unit further amplifies the signal to be transmitted to a level according to the control of the control unit.
  • the transmission power from the transmission unit is increased according to the radio wave reception level between the base station and other base stations.
  • the reception unit includes a reception level detection unit for measuring a reception level of a signal from the base station selected under the control of the control unit, and an error detection unit for detecting an error rate of the received signal.
  • a control unit configured to detect a deterioration of the reception status with the base station during a call based on the detection result of the reception level detection unit and the detection result of the error detection unit, The transmission power from the transmission unit is increased according to the result of sequentially detecting the reception level with another base station by the reception level detection unit.
  • the reception level detection unit detects a reception level of a control channel signal from another base station in the vicinity.
  • the reception unit includes a reception level detection unit for measuring a reception level of a signal from the base station selected under the control of the control unit, and an error detection unit for detecting an error rate of the received signal.
  • a control unit configured to detect a deterioration of the reception status with the base station during a call based on the detection result of the reception level detection unit and the detection result of the error detection unit, The transmission power from the transmission unit is increased according to the result of the handover attempt with another base station.
  • the communication between the wireless device and the base station is performed by the SDMA method.
  • a wireless device capable of communicating with a base station selected from a plurality of base stations and variably controlling the transmission power of a signal to be transmitted to the base station.
  • a power control method comprising: detecting a reception level of a radio wave between another base station around a calling base station and another base station in response to detecting deterioration of a reception state with the base station during the call. And increasing the transmission power according to the detected radio wave reception level.
  • communication can be performed with a selected base station from among a plurality of base stations, and transmission power of a signal transmitted to the base station can be variably controlled.
  • a transmission power control method for a wireless device comprising: detecting deterioration of a reception status with a base station during a call based on a reception level of a signal from the base station during a call and an error rate of the received signal.
  • a transmission apparatus for communicating with a base station selected from a plurality of base stations and variably controlling the transmission power of a signal transmitted to the base station.
  • a program for a computer that performs power control, and receives radio waves with other base stations around the base station during a call in response to detecting deterioration of reception conditions with the base station during a call.
  • the computer is caused to execute a step of detecting the level and a step of increasing the transmission power according to the detected radio wave reception level.
  • a transmission apparatus for communicating with a base station selected from a plurality of base stations and variably controlling the transmission power of a signal transmitted to the base station.
  • a program for a computer that performs power control, and detects a deterioration in reception status with a base station during a call based on a reception level of a signal from a base station during a call and an error rate of the received signal. Accordingly, a step of attempting a handover with another base station around the base station during a call and a step of increasing the transmission power from the transmitting unit according to a result of the handover attempt are included. Let the computer run.
  • the main advantage of the present invention is that even if the transmission power from a terminal during a call to a base station is increased, the reception state of another terminal communicating with another base station is not adversely affected. That is.
  • FIG. 1 is a schematic block diagram for explaining the configuration of the terminal wireless device 100.
  • FIG. 2 is a conceptual diagram for explaining a configuration of a signal transmitted and received between the terminal wireless device 1000 and the SDMA base station.
  • FIG. 3 is a conceptual diagram showing a case where transmission power can be increased.
  • FIG. 4 is a flowchart for explaining the operation of terminal radio apparatus 1000.
  • FIG. 5 is a flowchart for explaining the operation of the terminal wireless device according to the second embodiment.
  • FIG. 6 is a diagram showing a U-wave measurement processing sequence flow.
  • FIG. 7 is a conceptual diagram showing a terminal communicating with the SDMA base station.
  • FIG. 8 is a conceptual diagram showing the radio wave directivity when the SDMA-PHS base station 71 transmits and receives data to and from the PHS terminal PS1.
  • FIG. 9 is a schematic diagram schematically showing the operation principle of the adaptive array radio base station.
  • FIG. 10 is a block diagram showing a configuration of the adaptive array 100. As shown in FIG. 10
  • FIG. 11 is a diagram in which transmission and reception of a radio signal between the user A and the adaptive array radio base station 1 are imaged.
  • FIG. 1 is a schematic block diagram illustrating a configuration of a terminal wireless device 1000 used in an SDMA PHS system.
  • a terminal wireless device used in an SDMA PHS system will be described as an example, but the present invention is not limited to such a case, and the present invention is applicable to other mobile communication systems. Applicable.
  • terminal radio apparatus 1000 includes an antenna 10 for transmitting and receiving radio waves to and from a base station, and an antenna 10 depending on whether the apparatus is in a transmission mode or a reception mode.
  • a switch unit 12 for switching a path between the switch units, an RF reception circuit 14 for receiving and down-converting a high-frequency reception signal from the switch unit 12, and transmitting the signal based on an output from the RF reception circuit 14.
  • a demodulation circuit 16 for extracting the received digital signal, and a FER counter 18 for receiving the signal from the demodulation circuit 16 and counting the number of errors (FER: Frame Error Rate) in the frame of the received signal described later.
  • the RF reception circuit 14 includes a frequency conversion circuit 100 for down-converting the signal from the switch section 12 and a frequency conversion circuit 10
  • a received signal level measuring circuit 102 for measuring a received signal level based on the output of 0.
  • the terminal wireless device 1000 further receives the output from the demodulation circuit 16, supplies a downstream audio signal to an audio processing unit (not shown), and receives the signal from the reception level measurement circuit.
  • a control device (20) for controlling the level of the transmission power based on the level signal and the FER information from the FER counter (18) is provided.
  • the control device 20 also controls the frequency of the signal received by the RF receiving circuit 14 by controlling the frequency conversion circuit 100.
  • the terminal wireless device 1000 further receives a bit data corresponding to the uplink audio signal from the audio processing unit via the control device 20 and modulates the modulation circuit 22 and the modulation circuit 22. And an RF transmission circuit 24 for outputting an output as a high-frequency signal.
  • the RF transmission circuit 24 receives the output of the modulation circuit 22 and converts the frequency of the frequency conversion circuit 110 into a frequency conversion circuit 110 for up-conversion to a frequency controlled by the control device 20.
  • a transmission amplifier for receiving the output and amplifying the output by the amplification factor (amplifier gain) controlled by the control device.
  • FIG. 2 is a conceptual diagram for explaining a configuration of a signal transmitted and received between the terminal wireless device 100 and the SDMA base station in the present invention.
  • the signal of one frame is divided into eight slots, the first four slots are for reception, for example, and the last four slots are for transmission, for example.
  • Each slot is composed of one hundred and twenty symbols, and in the example shown in FIG. 2, one frame signal is allocated to four users with one reception slot and one transmission slot as one set.
  • each frame includes the above-described training signal (reference signal) section, and has a configuration capable of performing error detection (CRC: cyclic redundancy check) using a cyclic code.
  • CRC cyclic redundancy check
  • the FERR counter 18 counts the error rate for each frame.
  • the control device 20 searches the signal from the base station by controlling the frequency conversion circuit 100. If a signal from a surrounding base station is not detected, or if the signal is below a predetermined level, the controller 20 increases the transmission power from the terminal 1000 to a predetermined value, for example, 10 mW or more.
  • the transmission amplifier is controlled to increase the transmission power.
  • FIG. 3 is a conceptual diagram showing a case where such transmission power can be increased.
  • the terminal wireless device PS When the terminal wireless device PS is communicating with the base station CS1 and the transmission power from the terminal PS is increased, the terminal wireless device PS is far enough away from the surrounding base station CS1 that radio waves cannot reach. Therefore, even if the transmission power from the terminal PS is increased, the reception state of another terminal communicating with the base station CS2 is not adversely affected.
  • FIG. 4 is a flowchart for explaining the operation of terminal radio apparatus 1000.
  • the process shown in FIG. 4 is a process performed when it is determined that the reception state has deteriorated based on the reception level and the FER information during the main routine process of the control device 20.
  • a computer system including a processor that operates based on software is provided in the control device 20, and the reception state is deteriorated based on the reception level and the FER information during the normal call control processing. If it is determined that this processor, the following processing will be performed by this processor.
  • step S100 when an instruction to increase the transmission power is issued based on the reception level and the FER information of the control device 20 (step S100), it is determined whether the transmission power becomes higher than a predetermined value as a result of increasing the transmission power. Is performed (step S102). If the transmission power does not become larger than the predetermined value, the transmission power is set to a predetermined reference value (step S110), and the process returns to the main routine (step S112). On the other hand, if the transmission power becomes larger than the predetermined value in step S102, control device 20 subsequently searches for a signal from a surrounding base station (step S104).
  • step S106 If no signal from another base station is found (or if the signal level is lower than a predetermined level) (step S106), then the transmission power is set to the specified value (step S1). 08), the process returns to the main routine (step S112). On the other hand, if a signal from another base station is found in step S106 (or if it exceeds a predetermined level) (step S106), the transmission power is set to a predetermined reference value ( In step S110), the process returns to the main routine (step S112).
  • the "signal from the surrounding base station” may be, for example, a control channel signal transmitted from another base station.
  • the “signal from the surrounding base station” can be a control channel signal transmitted from the base station of the same operator as the terminal that is talking.
  • the “signal from surrounding base stations” can be a control channel signal transmitted from base stations of all carriers different from the terminal in communication.
  • the reception state has deteriorated based on the reception level and the FER information of the terminal wireless device 100
  • a signal from a peripheral base station other than the base station that is currently in a call is used.
  • the level was searched for by controlling the frequency conversion circuit 100 by the control device 20 to determine whether or not to increase the transmission power.
  • the second embodiment when it is determined that the reception state has deteriorated based on the reception level and the FER information of the terminal wireless device 100, so-called “handover” is performed with another base station. It is determined whether or not transmission is possible, and accordingly, it is determined whether to increase the transmission power.
  • Other configurations of the terminal wireless device of the second embodiment are the same as those of the terminal wireless device 100 of the first embodiment.
  • FIG. 5 is a flowchart for explaining the operation of the terminal wireless device according to the second embodiment.
  • the processing shown in FIG. 5 is also performed when it is determined that the reception state has deteriorated based on the reception level and the FER information during the main routine processing of the control device 20. Indicates the processing to be performed.
  • the control device 20 determines that the FER has exceeded a predetermined value (for example, 20%) based on the FER information that is constantly monitored and the reception level has fallen below a predetermined value (for example, 20 dB ⁇ V). In this case, it is determined that it is difficult to maintain the call with the base station that has been making the call (step S200).
  • a predetermined value for example, 20%
  • step S202 a handover process is attempted, and it is determined whether the handover is successful.
  • step S202 If the handover is successful (step S202), the communication with the handover destination base station is continued (step S204).
  • step S202 the transmission power is increased by a predetermined value from the previous value (step S206).
  • step S Stop the process of trying to handover to another base station, and perform the process of restoring the call with the base station that was originally talking (referred to as the “handover return process”) (step S). 208).
  • step 210 If the handover reverting process is successful (step 210), the process returns to the main routine (step S212). On the other hand, if the handover reverting process fails (step 210), the process proceeds to a call disconnection process (step S21).
  • the handover failure basically means, as shown in FIG. 3, that when the terminal wireless device PS is communicating with the base station CS 1, the transmission power from the terminal PS is increased.
  • the surrounding base station CS 1 means that it is far enough away that radio waves cannot reach. Therefore, similarly to Embodiment 1, even if the transmission power from terminal PS is increased, there is no adverse effect on the reception state of another terminal communicating with base station CS2.

Abstract

L'invention concerne un appareil radio (1000) qui communique avec une station de base sélectionnée parmi plusieurs stations de base. Un circuit de réception RF (14) et un circuit de modulation (16) reçoit des ondes radio de la station de base et extrait un signal numérique correspondant. Un circuit d'émission RF (24) amplifie un signal, devant être envoyé à la station de base, à un niveau conforme à la commande par l'appareil de commande (20). Lorsque, sur la base d'une information FER correspondant à un résultat de mesure et un résultat de détection d'erreur d'un circuit de mesure du niveau de réception (102), on détecte une dégradation de l'état de réception relative à la station de base avec laquelle l'appareil radio (1000) est en cours de communication, l'appareil de commande (20) augmente la puissance d'émission d'une section d'émission en conformité avec les niveaux de réception d'ondes radio d'autres stations autour de la station de base avec laquelle l'appareil radio (1000) est en cours de communication.
PCT/JP2001/011314 2000-12-27 2001-12-21 Appareil radio, procede de commande de puissance d'emission, et programme de commande de puissance d'emission WO2002054817A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-398284 2000-12-27
JP2000398284A JP2004297106A (ja) 2000-12-27 2000-12-27 無線装置

Publications (2)

Publication Number Publication Date
WO2002054817A1 true WO2002054817A1 (fr) 2002-07-11
WO2002054817A8 WO2002054817A8 (fr) 2002-09-26

Family

ID=18863280

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/011314 WO2002054817A1 (fr) 2000-12-27 2001-12-21 Appareil radio, procede de commande de puissance d'emission, et programme de commande de puissance d'emission

Country Status (2)

Country Link
JP (1) JP2004297106A (fr)
WO (1) WO2002054817A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102546057A (zh) * 2011-12-30 2012-07-04 国家无线电监测中心检测中心 手机的全向辐射功率的同步测量系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07240967A (ja) * 1994-03-02 1995-09-12 Hitachi Ltd 移動電話機およびその制御方法
JPH08256102A (ja) * 1995-01-19 1996-10-01 Sony Corp セルラーシステム
JPH11122672A (ja) * 1997-10-16 1999-04-30 Sony Corp セルラー無線通信システム及び基地局
JP2000101552A (ja) * 1998-09-24 2000-04-07 Sanyo Electric Co Ltd アンテナの指向性制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07240967A (ja) * 1994-03-02 1995-09-12 Hitachi Ltd 移動電話機およびその制御方法
JPH08256102A (ja) * 1995-01-19 1996-10-01 Sony Corp セルラーシステム
JPH11122672A (ja) * 1997-10-16 1999-04-30 Sony Corp セルラー無線通信システム及び基地局
JP2000101552A (ja) * 1998-09-24 2000-04-07 Sanyo Electric Co Ltd アンテナの指向性制御方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102546057A (zh) * 2011-12-30 2012-07-04 国家无线电监测中心检测中心 手机的全向辐射功率的同步测量系统
CN102546057B (zh) * 2011-12-30 2014-04-16 国家无线电监测中心检测中心 手机的全向辐射功率的同步测量系统

Also Published As

Publication number Publication date
WO2002054817A8 (fr) 2002-09-26
JP2004297106A (ja) 2004-10-21

Similar Documents

Publication Publication Date Title
US6911948B2 (en) Antenna steering scheduler for mobile station in wireless local area network
JP4166026B2 (ja) 無線装置、空間パス制御方法および空間パス制御プログラム
US7042860B2 (en) Wireless communication system, weight control apparatus, and weight vector generation method
US8072946B2 (en) Coordinated transmissions in wireless networks
Hu et al. MIMO ad hoc networks: Medium access control, saturation throughput, and optimal hop distance
JP3167682B2 (ja) 送信指向性を有する無線装置およびその制御方法
JP5021146B2 (ja) アダプティブ・アレイ通信システムにおけるモード切換
JP2783222B2 (ja) 移動通信システムのアンテナ利得制御装置
US8879509B2 (en) Antenna Diversity
JPH08242481A (ja) ビーム選択付きマルチビーム・アンテナを採用したセルラー移動通信システム用のアップリンク・チャネル割当方法および装置
KR20070094670A (ko) 다중 입력 다중 출력 안테나의 빔 조합을 선택하는 방법 및장치
US8027315B2 (en) Antenna diversity
US9942059B2 (en) Wireless communication system, wireless control method, and virtual base station apparatus
CN108123747B (zh) 一种基于扇区切换的wlan基站信号覆盖方法
WO2003081808A1 (fr) Dispositif radio, procede et programme de commande de directivite d'emission/reception
US20070064706A1 (en) Method of communication in a wireless communication network, corresponding station and network
JP3939069B2 (ja) アンテナ指向性制御方法および無線装置
CN1805297A (zh) 防辐射移动通信终端
Asakura et al. Cooperative signal reception and down-link beam forming in cellular mobile communications
JP2002208889A (ja) 無線通信システム、ウェイト制御装置及びウェイト・ベクトル生成方法並びに無線基地局用アダプティブアレイの制御方法及びアダプティブアレイ
US20200229003A1 (en) Access Point Device and Communication Method
KR100690329B1 (ko) 분산안테나 시스템을 이용한 무선 통신 방법
WO2002054817A1 (fr) Appareil radio, procede de commande de puissance d'emission, et programme de commande de puissance d'emission
CN1411292A (zh) 消除楼内移动通信系统的反向链路干扰的装置和方法
CN115514399A (zh) 天线选择方法及装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

AK Designated states

Kind code of ref document: C1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: C1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

WR Later publication of a revised version of an international search report
121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase