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WO1999034627A1 - Dispositif de radiocommunication - Google Patents

Dispositif de radiocommunication Download PDF

Info

Publication number
WO1999034627A1
WO1999034627A1 PCT/JP1997/004792 JP9704792W WO9934627A1 WO 1999034627 A1 WO1999034627 A1 WO 1999034627A1 JP 9704792 W JP9704792 W JP 9704792W WO 9934627 A1 WO9934627 A1 WO 9934627A1
Authority
WO
WIPO (PCT)
Prior art keywords
handover
radio unit
threshold value
electric field
wireless communication
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP1997/004792
Other languages
English (en)
Japanese (ja)
Inventor
Atsuya Kume
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP1997/004792 priority Critical patent/WO1999034627A1/fr
Priority to GB9919781A priority patent/GB2337184B/en
Publication of WO1999034627A1 publication Critical patent/WO1999034627A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

Definitions

  • the present invention relates to a wireless communication device that performs wireless communication with a base station in a communication area using a portable wireless terminal.
  • FIG. 1 is a configuration diagram showing a wireless communication device using a portable wireless terminal.
  • a central base station 3 between a base station 1 in a communication area E 1 and a base station 2 in a communication area E 2 is illustrated. Connected via.
  • the mobile wireless terminal 4 in the communication area E1 communicates with the base station 1 by, for example, frequency multiple access (FDMA) or time division multiple access (TDMA).
  • FIG. 2 is a block diagram showing the configuration of the portable wireless terminal.
  • 10 is a transmitting / receiving antenna
  • 11 is a radio section
  • 12 and 13 are an audio processing section and a central control section (hereinafter, CPU).
  • 14 and 15 are a microphone and a speaker connected to the audio processing unit 12
  • 16 is a ROM that stores a control program
  • 17 is a memory that temporarily stores the program processing data.
  • RAM, 18 stores the local telephone number and the telephone number of the other party.
  • RAM, 19 is a display unit
  • 20 is an operation unit. These are ROM 16, RAM I 7, 18
  • the display unit 19 and the operation unit 20 are connected to the CPU 13.
  • the CPU 13 which has inputted the operation signal receives R ⁇ 16, RAM I 7, Between 1 8 and de overnight The communication is performed, and the destination telephone number is transmitted via the radio section 11 and the transmitting / receiving antenna 10.
  • the base station 1 receiving this transmission signal sends a transmission signal to the other party's base station 2 through the central base station 3 and sends the transmission signal from the base station 2 to the other's portable wireless terminal 5, and the two portable wireless terminals 4, 5 Connect to a call-enabled state.
  • the audio is converted to an electric signal by the microphone 14, processed by the audio processing unit 12, and transmitted via the radio unit 11 and the transmitting / receiving antenna 10.
  • the transmission signal from the other party is input to the audio processing unit 12 via the transmission / reception antenna 10 and the radio unit 11, processed by the audio processing unit 12, and then output as sound from the speaker 15. Make a call.
  • the radio wave from the base station 1 received by the transmitting / receiving antenna 10 is input to the radio unit 11 to measure the electric field level and the line quality.
  • CP 13 compares the electric field level and line quality measured by radio section 11 with a certain threshold.
  • the threshold value was determined by the base station Is notified in advance.
  • the CPU 13 determines that the electric field level or the line quality is below the threshold value as a result of the comparison, it issues a handover instruction, and the radio unit 11 starts handover according to the instruction.
  • the conventional wireless communication device is configured as described above, even if there is no base station that should be handed over, if the received radio wave deteriorates and falls below the threshold, for example, Since the handover operation is performed at intervals of 5 seconds, the handover causes a two-second break in the voice, resulting in a problem that the call quality is significantly deteriorated.
  • the present invention has been made to solve the above-described problems, and a When there are no base stations to be overhung, the purpose is to improve the communication quality by reducing the frequency of handover operations. Disclosure of the invention
  • the invention relates to a radio unit connected to a transmitting / receiving antenna, and comparing one or both of the electric field level and the line quality measured by the radio unit with a threshold value.
  • the present invention includes a selection device for selecting whether to change the handover condition according to the handover failure or to keep the handover condition fixed irrespective of the handover failure. In addition, it is possible to prevent unnecessary change of the handover condition in the area where the communication condition is good.
  • the present invention sets the time at which the next handover can be started in response to the handover failure, and / or the threshold for comparing the electric field level and the line quality measured by the radio unit. By changing, unnecessary handover is reduced and communication quality is improved.
  • the present invention sets the time when the next handover can be started in response to the success of the handover, and / or the threshold for comparing the electric field level and the line quality measured by the radio unit. By changing, it is possible to prevent unnecessary change of the handover condition in the area where the communication condition is good.
  • the present invention provides a radio unit connected to a transmitting / receiving antenna, If one or both of the electric field level and the line quality measured by the radio communication unit are equal to or less than the threshold value, a handover instruction is output to the radio unit, and a handover by the handover instruction is performed.
  • handover can be forcibly executed according to the user's will.
  • the present invention provides a radio unit connected to a transmitting / receiving antenna, and comparing one or both of the electric field level and the line quality measured by the radio unit with a threshold value, A handover instruction is output to the radio unit, and when the handover by the handover instruction fails, the control unit lowers the threshold value, and the control unit reduces the threshold value, regardless of the electric field level and / or the line quality.
  • FIG. 1 is a configuration diagram showing a wireless communication system using a mobile wireless terminal
  • FIG. 2 is a block diagram showing a configuration of a mobile wireless terminal
  • FIG. 3 is a diagram of a wireless communication device according to a first embodiment of the present invention.
  • FIG. 4 is a flowchart showing the operation
  • FIG. 4 is a flowchart showing the operation of the wireless communication apparatus according to the second embodiment of the present invention
  • FIG. 5 is an operation of the wireless communication apparatus according to the third embodiment of the present invention.
  • FIG. 6 is a flowchart showing the operation of the wireless communication apparatus according to Embodiment 4 of the present invention.
  • the configurations of the wireless communication device and the portable wireless terminal according to the present invention are the same as those shown in FIGS. 1 and 2, and the wireless section 11, the CPU 13, and the operating section 2 which are the constituent elements of the portable wireless terminal. 0 is a new function.
  • FIG. 3 is a flowchart showing the operation of the wireless communication apparatus according to Embodiment 1 of the present invention.
  • a threshold value is set to a default value (TH.) In step ST1.
  • the radio unit 11 measures one or both of the received electric field level and the line quality, and inputs the measured value to the CPU 13.
  • the CPU 13 compares one or both of the electric field level and the line quality with the threshold value (step ST 2) to determine whether the threshold value has been exceeded (step ST 3). Are repeated, and if YES, a handover instruction is output to the radio section 11 (step ST4).
  • the radio section 11 executes the handover based on the handover instruction and determines whether the handover is successful (step ST5). If the handover fails, the threshold value is set to the default value TH. Set it to a smaller value (step ST 6). Therefore, the next handover starts handover when the value falls below the newly set threshold. Therefore, when the electric field level and the line quality are the same, the repetition of handover is reduced.
  • step ST5 it is determined that handover was successful.
  • the default value based on the threshold value. It is to return to.
  • FIG. 4 is a flowchart showing the operation of the wireless communication apparatus according to Embodiment 2 of the present invention, in which the threshold value is changed stepwise according to the number of handover failures.
  • step ST 13 compares one or both of the electric field level and the line quality with the threshold value (step ST 13), determines whether the value has fallen below the threshold value (step ST 14), and sets N 0. If so, the above determination is repeated, and if YES, a handover instruction is output to radio section 11 (step ST15).
  • the radio section 11 performs the handover based on the handover instruction and determines whether the handover is successful (step ST16), and if the handover fails, increases the number n of handover failures by one (step ST16).
  • Step ST19 the number n of handover failures is returned to 0 (step ST19), and the threshold value is set to the default value TH. (Step ST 20). That is, it returns to the initial setting state all at once.
  • FIG. 5 is a flowchart showing the operation of the wireless communication apparatus according to the third embodiment of the present invention.
  • the threshold value is set as a default value (TH) in step ST21.
  • step ST22 compares one or both of the electric field level and the line quality with a threshold value (step ST22), determines whether the threshold value has been exceeded (step ST23), and sets N0. If so, repeat the above determination. If YES, wireless section 11 outputs a handover instruction and executes handover (step ST 24
  • step ST25 it is determined whether the handover is successful (step ST25), and if the handover fails, it is determined whether the input is fixed (step ST26). If so, the threshold is changed (step ST27). If it is determined in step ST25 that the handover is successful, it is determined whether the input is fixed (step ST28). Return the threshold to the default value (step ST29) o Embodiment 4.
  • Fig. 6 shows the invention
  • the handover inhibition time is set to a default value (step ST31).
  • step ST32 one or both of the electric field level and the line quality received by the radio unit 11 are measured and input to the CPU 13.
  • the CPU 13 compares one or both of the electric field level and the line quality with the threshold value (step ST32), determines whether or not the threshold value has been exceeded (step ST33), and determines whether the answer is NO. If so, repeat the above determination. If YES, determine whether handover is prohibited (step ST34). If YES, return to step ST32. If NO, perform handover. Step ST 35 5).
  • step ST36 it is determined whether the handover is successful. If the handover is successful, the prohibition time is restored (step ST37), and if the handover fails, the prohibition time is changed (step ST37). Step ST38) returns to step ST32, and repeats the above operation.
  • the next handover when the handover fails, the next handover is not performed for a certain period of time.However, the time until the next handover can be started is changed stepwise according to the number of failures. Is also good. For example, in the case of two consecutive failures, the time for starting the next handover may be further extended. Also, the prohibition time when handover fails may be changed according to how many times handover has failed.
  • the operation unit 20 may be provided with a selection unit for selecting whether to perform the operation or not. Good.
  • Embodiments 1 to 3 the threshold is changed when handover fails, and in Embodiments 4 to 6, the time at which the next handover can be started when handover fails is changed. Although shown, both may be changed simultaneously.
  • Embodiment 8 the threshold is changed when handover fails, and in Embodiments 4 to 6, the time at which the next handover can be started when handover fails is changed. Although shown, both may be changed simultaneously.
  • Embodiments 1 to 7 show that the condition of the handover is changed when the handover fails, but the condition of the handover may be changed by the success of the handover. For example, if the handover frequency is constantly monitored and the handover frequency becomes higher than a certain value, the threshold value may be changed or the handover start time may be changed. Good.
  • Embodiment 9 shows that the condition of the handover is changed when the handover fails, but the condition of the handover may be changed by the success of the handover. For example, if the handover frequency is constantly monitored and the handover frequency becomes higher than a certain value, the threshold value may be changed or the handover start time may be changed. Good.
  • Embodiments 1 to 8 show that handover is started based on the electric field level and line quality output from radio section 11, but regardless of output from radio section 11, The handover may be started or not performed by a request, that is, by a request signal input from the operation unit 3.
  • the wireless communication apparatus is configured to lower the handover threshold value when handover fails, so that unnecessary handover without a handover destination is prevented. Prevent and improve communication quality.

Landscapes

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

Abstract

Selon cette invention, on améliore la qualité de transmission de la parole dans un dispositif de radiocommunication communiquant avec une station de base dans une zone de communication au moyen d'un équipement terminal radioélectrique portatif, en réduisant la fréquence des commutations par le changement de l'état initial à partir duquel commence la commutation, en fonction de l'historique des commutations.
PCT/JP1997/004792 1997-12-24 1997-12-24 Dispositif de radiocommunication Ceased WO1999034627A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1997/004792 WO1999034627A1 (fr) 1997-12-24 1997-12-24 Dispositif de radiocommunication
GB9919781A GB2337184B (en) 1997-12-24 1997-12-24 Radio communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/004792 WO1999034627A1 (fr) 1997-12-24 1997-12-24 Dispositif de radiocommunication

Publications (1)

Publication Number Publication Date
WO1999034627A1 true WO1999034627A1 (fr) 1999-07-08

Family

ID=14181741

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/004792 Ceased WO1999034627A1 (fr) 1997-12-24 1997-12-24 Dispositif de radiocommunication

Country Status (2)

Country Link
GB (1) GB2337184B (fr)
WO (1) WO1999034627A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342255A (en) * 1998-07-15 2000-04-05 Nec Corp Mobile phone with communication channel switching
JP2006186797A (ja) * 2004-12-28 2006-07-13 Nec Corp ハンドオーバー制御方法／プログラム／プログラム記録媒体、無線通信端末局／基地局／システム
US7292857B2 (en) 2004-06-01 2007-11-06 Nec Corporation Mobile station, radio communication system, base station switching control method, program, and recording medium
EP2166797A1 (fr) 2008-09-18 2010-03-24 Fujitsu Limited Appareil de station de base, système de contrôle de communication, procédé de contrôle de communication, et procédé de contrôle entre stations
JP2010093639A (ja) * 2008-10-09 2010-04-22 Nec Corp 無線通信システム、ハンドオーバ記憶装置、制御方法、及び、プログラム
JP2011510580A (ja) * 2008-01-25 2011-03-31 ブリティッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー ハンドオーバ制御
JP2011199447A (ja) * 2010-03-18 2011-10-06 Denso Wave Inc 無線通信システム
WO2014129183A1 (fr) * 2013-02-25 2014-08-28 日本電気株式会社 Terminal sans fil, système de communication sans fil, procédé de transfert intercellulaire et support d'informations
JP2015506624A (ja) * 2012-01-10 2015-03-02 ノキア ソリューションズ アンド ネットワークス オサケユキチュア 通信システムにおけるハンドオーバー要求の取り扱い
US20220174519A1 (en) * 2019-03-28 2022-06-02 Apple Inc. Physical layer cell identifier (pci) configuration and automatic neighbor relations (anr) for 5g networks

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364854B (en) * 2000-07-13 2004-03-31 Motorola Inc Mobile communication system, mobile radio unit and method of performing a handover
EP1993234A4 (fr) * 2006-03-09 2012-08-22 Nec Corp Système et terminal de réseau local sans fil, et procédé de recherche de station de base pour lesdits système et terminal
EP3002973B1 (fr) 2010-01-25 2019-03-20 BlackBerry Limited Procédé et dispositif pour traiter des appels vocaux dans un dispositif de communication mobile sans fil en mode double
JP5246204B2 (ja) 2010-04-22 2013-07-24 株式会社デンソー ハンドオーバ制御装置、ハンドオーバ制御方法、およびプログラム

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JPH01205636A (ja) * 1988-02-12 1989-08-18 Nec Corp 自動車電話基地局
JPH01252033A (ja) * 1988-03-31 1989-10-06 Mitsubishi Electric Corp 制御信号捕捉方法
JPH0269027A (ja) * 1988-09-05 1990-03-08 Nippon Telegr & Teleph Corp <Ntt> 移動通信通話チャネル制御方式
JPH03135120A (ja) * 1989-10-20 1991-06-10 Nec Corp 通話チャネル切換え方式
JPH0591038A (ja) * 1991-09-30 1993-04-09 Nippon Telegr & Teleph Corp <Ntt> 移動通信のチヤネル切替方式

Patent Citations (6)

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JPS63245025A (ja) * 1987-03-31 1988-10-12 Nippon Telegr & Teleph Corp <Ntt> 移動無線チヤネル制御方式
JPH01205636A (ja) * 1988-02-12 1989-08-18 Nec Corp 自動車電話基地局
JPH01252033A (ja) * 1988-03-31 1989-10-06 Mitsubishi Electric Corp 制御信号捕捉方法
JPH0269027A (ja) * 1988-09-05 1990-03-08 Nippon Telegr & Teleph Corp <Ntt> 移動通信通話チャネル制御方式
JPH03135120A (ja) * 1989-10-20 1991-06-10 Nec Corp 通話チャネル切換え方式
JPH0591038A (ja) * 1991-09-30 1993-04-09 Nippon Telegr & Teleph Corp <Ntt> 移動通信のチヤネル切替方式

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342255B (en) * 1998-07-15 2000-09-13 Nec Corp Mobile phone with communication channel switching determinating unit
US6377806B1 (en) 1998-07-15 2002-04-23 Nec Corporation Mobile phone with communication channel switching determinating unit
AU754485B2 (en) * 1998-07-15 2002-11-14 Nec Corporation Mobile phone with communication channel switching determinating unit
GB2342255A (en) * 1998-07-15 2000-04-05 Nec Corp Mobile phone with communication channel switching
US7292857B2 (en) 2004-06-01 2007-11-06 Nec Corporation Mobile station, radio communication system, base station switching control method, program, and recording medium
JP2006186797A (ja) * 2004-12-28 2006-07-13 Nec Corp ハンドオーバー制御方法／プログラム／プログラム記録媒体、無線通信端末局／基地局／システム
JP2011510580A (ja) * 2008-01-25 2011-03-31 ブリティッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー ハンドオーバ制御
US8169971B2 (en) 2008-09-18 2012-05-01 Fujitsu Limited Base station apparatus, communication control system, communication control method, and inter-station control method
EP2166797A1 (fr) 2008-09-18 2010-03-24 Fujitsu Limited Appareil de station de base, système de contrôle de communication, procédé de contrôle de communication, et procédé de contrôle entre stations
US8422433B2 (en) 2008-09-18 2013-04-16 Fujitsu Limited Base station apparatus, communication control system, communication control method, and inter-station control method
JP2010093639A (ja) * 2008-10-09 2010-04-22 Nec Corp 無線通信システム、ハンドオーバ記憶装置、制御方法、及び、プログラム
JP2011199447A (ja) * 2010-03-18 2011-10-06 Denso Wave Inc 無線通信システム
JP2015506624A (ja) * 2012-01-10 2015-03-02 ノキア ソリューションズ アンド ネットワークス オサケユキチュア 通信システムにおけるハンドオーバー要求の取り扱い
JP2017147755A (ja) * 2012-01-10 2017-08-24 ノキア ソリューションズ アンド ネットワークス オサケユキチュア 通信システムにおけるハンドオーバー要求の取り扱い
US10728819B2 (en) 2012-01-10 2020-07-28 Nokia Solutions And Networks Oy Handling handover requests in a communications system
WO2014129183A1 (fr) * 2013-02-25 2014-08-28 日本電気株式会社 Terminal sans fil, système de communication sans fil, procédé de transfert intercellulaire et support d'informations
JPWO2014129183A1 (ja) * 2013-02-25 2017-02-02 日本電気株式会社 無線端末、無線通信システム、ハンドオーバ方法、およびプログラム
US9967789B2 (en) 2013-02-25 2018-05-08 Nec Corporation Wireless terminal, wireless communication system, handover method and recording medium
US20220174519A1 (en) * 2019-03-28 2022-06-02 Apple Inc. Physical layer cell identifier (pci) configuration and automatic neighbor relations (anr) for 5g networks
US12464383B2 (en) * 2019-03-28 2025-11-04 Apple Inc. Physical layer cell identifier (PCI) configuration and automatic neighbor relations (ANR) for 5G networks

Also Published As

Publication number Publication date
GB9919781D0 (en) 1999-10-27
GB2337184A (en) 1999-11-10
GB2337184B (en) 2003-05-07

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