JP3076320B1 - Handover control method - Google Patents
Handover control methodInfo
- Publication number
- JP3076320B1 JP3076320B1 JP3371799A JP3371799A JP3076320B1 JP 3076320 B1 JP3076320 B1 JP 3076320B1 JP 3371799 A JP3371799 A JP 3371799A JP 3371799 A JP3371799 A JP 3371799A JP 3076320 B1 JP3076320 B1 JP 3076320B1
- Authority
- JP
- Japan
- Prior art keywords
- base station
- communication
- mobile terminal
- radio base
- communication channel
- 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.)
- Expired - Fee Related
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
【要約】
【課題】 無音時間のないハンドオーバ処理を可能にす
る。
【解決手段】 移動端末７が移動元無線基地局１の受信
品質または受信レベルの劣化を検出し、かつ周辺に一定
以上の受信品質または受信レベルの無線信号を受信でき
る移動先無線基地局２が存在することを検出すると、移
動端末７から移動先無線基地局２に対して、他方の通話
チャネルＢを割り当てるための通話チャネル接続要求信
号を送信し、この通話チャネル接続要求信号を受信した
移動先無線基地局１に他方の通話チャネルＢに対応する
通話チャネルに空きがある時は移動端末７に対し接続応
答信号を送信し、他方の通話チャネルＢによる通話路を
確立して、移動端末７と移動先無線基地局１間の通信を
継続させる。通話路が確立された後の移動端末７と移動
元無線基地局１の通話チャネルでの通話路を切断する。Abstract: PROBLEM TO BE SOLVED: To enable handover processing without silence time. SOLUTION: A mobile terminal 7 detects deterioration of reception quality or reception level of a source radio base station 1, and a target radio base station 2 which can receive a radio signal of a predetermined or higher reception quality or reception level in the vicinity is provided. Upon detecting the presence, the mobile terminal 7 transmits a communication channel connection request signal for allocating the other communication channel B to the movement target radio base station 2, and the movement destination receiving the communication channel connection request signal When the wireless base station 1 has a vacancy in the communication channel corresponding to the other communication channel B, a connection response signal is transmitted to the mobile terminal 7 to establish a communication path using the other communication channel B, and The communication between the destination wireless base stations 1 is continued. After the communication path is established, the communication path in the communication channel between the mobile terminal 7 and the source radio base station 1 is disconnected.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＰＨＳ（パーソナ
ル・ハンディホン・システム）や屋内携帯電話機システ
ムなどの移動体通信システムにおいて、通話中の移動端
末が１つの基地局の無線ゾーンから他の基地局の無線ゾ
ーンへ移動する時、１つの基地局の通話チャネルから他
の基地局の通話チャネルに切り替えて通信を継続させる
ハンドオーバー制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system such as a PHS (Personal Handy Phone System) or an indoor portable telephone system. The present invention relates to a handover control method for switching from a communication channel of one base station to a communication channel of another base station and continuing communication when moving to a wireless zone of a station.
【０００２】[0002]
【従来の技術】従来、ＰＨＳなどの移動体通信システム
におけるハンドオーバー制御に際しては、移動しながら
通信中の移動端末が在圏するエリアの基地局から送信さ
れる無線信号の受信レベル及び受信品質が劣化したこと
を検出すると、無線信号を送受信する無線基地局を変更
するために、移動端末が現在通信している基地局（以
下、旧基地局という）に対してチャネル切替要求信号を
送信し、そして、これに対する旧基地局からのチャネル
切替指示信号を受信すると、無線信号の送受信動作が停
止し、移動端末と通話相手との間の通話が中断する。続
いて、移動端末からチャネル確立のための要求信号を新
無線基地局に送信する。新無線基地局がチャネル確立要
求信号を受信すると、移動端末との間の無線信号を送受
信するための通話チャネルを割り当て、この新通話チャ
ネルの設定が確認された後、交換機は旧無線基地局との
通話路を切断し、新無線基地局との通話路を設定する。
そして、交換機から新無線基地局への呼設定に伴い、移
動端末は、停止していた無線信号の送受信動作が再開さ
れ、これにより、移動端末と通話相手との間の通話を再
開することができる。2. Description of the Related Art Conventionally, when performing handover control in a mobile communication system such as a PHS, the reception level and reception quality of a radio signal transmitted from a base station in an area where a mobile terminal communicating while moving is located. Upon detecting the deterioration, the mobile terminal transmits a channel switching request signal to a base station with which the mobile terminal is currently communicating (hereinafter, referred to as an old base station) in order to change a radio base station that transmits and receives radio signals, When receiving the channel switching instruction signal from the old base station, the transmission / reception operation of the radio signal is stopped, and the communication between the mobile terminal and the communication partner is interrupted. Subsequently, a request signal for channel establishment is transmitted from the mobile terminal to the new radio base station. When the new radio base station receives the channel establishment request signal, it allocates a communication channel for transmitting and receiving a radio signal to and from the mobile terminal, and after confirming the setting of the new communication channel, the exchange switches with the old radio base station. And cut off the communication path and set up a communication path with the new wireless base station.
Then, with the call setup from the exchange to the new radio base station, the mobile terminal resumes the transmission / reception operation of the radio signal that has been stopped, thereby resuming the call between the mobile terminal and the other party. it can.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記のような
ＰＨＳなどの移動体通信システムにおけるハンドオーバ
処理では、移動端末の通話中に無線基地局からの電波が
弱くなり、そのままでは通話を保持することが難しいと
判断されてから初めて他の無線基地局を探しに行く、い
わゆるハンドオーバ処理を行う方式であるとともに、通
話チャネルに１チャネルしか使用していないため、ハン
ドオーバ処理により他の無線基地局を探して新通話チャ
ネルを設定し送受信動作を再開できるまでの間、通話路
は切断されてしまい、次に通話可能と判断された無線基
地局に移るまでの数秒間が無音になってしまう。その結
果、移動中に移動端末と通話相手との間の通話が突然に
切れたりして、両者間の通話に支障を来すという問題が
あった。However, in the handover process in a mobile communication system such as the PHS described above, the radio wave from the radio base station is weakened during the call of the mobile terminal, and the call is held as it is. Is a method of performing a so-called handover process in which a search is made for another wireless base station only after it is determined that the wireless base station is difficult, and since only one communication channel is used, another wireless base station is searched for by the handover process. Until the new communication channel is set and the transmission / reception operation can be resumed, the communication path is cut off, and there is no sound for a few seconds before moving to the next radio base station determined to be capable of communication. As a result, there has been a problem that a call between the mobile terminal and the other party is suddenly cut off while moving, which hinders a call between the two.
【０００４】本発明は、上記のような従来の課題を解決
するためになされたのもで、無音時間のないハンドオー
バ処理を可能にしたハンドオーバー制御方法を提供する
ことを目的とする。[0004] The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a handover control method which enables a handover process without a silent period.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明は、移動端末と、この移動端末との間の通話チ
ャネルで無線信号を送受信する複数の無線基地局を備
え、前記移動端末が通話しながら前記無線基地局の無線
ゾーン間を移動する時、一定以上の受信品質または受信
レベルの無線信号を受信できる無線基地局に切り替えて
通信を継続させるハンドオーバー制御方法であって、前
記移動端末に少なくとも２つの通話チャネルを割り当
て、前記移動端末が前記割り当てられた１つの通話チャ
ネルで通話中である無線ゾーンの無線基地局を移動元無
線基地局とし、かつ該移動元の無線基地局に近接する周
辺の無線基地局を移動先無線基地局とし、前記移動端末
の移動に伴い、該移動端末が移動元無線基地局の受信品
質または受信レベルの劣化を検出し、かつ周辺に一定以
上の受信品質または受信レベルの無線信号を受信できる
移動先無線基地局が存在することを検出した時に移動端
末から前記移動先無線基地局に対して、前記割り当てら
れた他の１つの通話チャネルを割り当てるための通話チ
ャネル接続要求信号を送信し、前記通話チャネル接続要
求信号を受信した前記移動先無線基地局に前記他の１つ
の通話チャネルに対応する通話チャネルに空きがある時
は前記移動端末に対し接続応答信号を送信し、前記通話
チャネル接続要求信号を受信した前記移動先無線基地局
に前記他の１つの通話チャネルに対応する通話チャネル
に空きがない時は、一定以上の受信品質または受信レベ
ルの無線信号を受信できる他の移動先無線基地局から接
続応答信号が返送されるまで通話チャネル接続要求が繰
り返されるようにし、前記移動端末が接続応答信号を受
信した時は前記他の１つの通話チャネルによる通話路を
確立して該通話チャネルで移動端末と移動先無線基地局
間の通信を継続させ、前記通話路が確立された後の前記
移動端末と前記移動元無線基地局の通話チャネルを切断
することを特徴とする。According to the present invention, there is provided a mobile terminal comprising: a mobile terminal; and a plurality of radio base stations for transmitting and receiving radio signals via a communication channel between the mobile terminal and the mobile terminal. When moving between wireless zones of the wireless base station while talking, the handover control method of switching to a wireless base station capable of receiving a wireless signal of a certain or higher reception quality or reception level and continuing communication, Assigning at least two communication channels to a mobile terminal, a radio base station in a radio zone in which the mobile terminal is communicating on the allocated one communication channel as a source radio base station, and the source radio base station A wireless base station in the vicinity of the target wireless base station is defined as a destination wireless base station, and with the movement of the mobile terminal, the mobile terminal receives the reception quality or reception level of the source wireless base station. The mobile terminal to the target radio base station when detecting that there is a target radio base station capable of receiving a radio signal of a predetermined or higher reception quality or reception level in the vicinity. A call channel connection request signal for allocating another one of the other call channels, and transmitting the call channel connection request signal to the target wireless base station that has received the call channel connection request signal, to a call channel corresponding to the other one of the call channels. When there is a vacancy, a connection response signal is transmitted to the mobile terminal, and when there is no vacancy in the communication channel corresponding to the other one of the other communication channels in the target radio base station that has received the communication channel connection request signal. Is a communication channel until a connection response signal is returned from another target radio base station that can receive radio signals with reception quality or reception level above a certain level. The connection request is repeated, and when the mobile terminal receives the connection response signal, a communication path is established by the other one of the communication channels, and communication between the mobile terminal and the destination radio base station is performed on the communication channel. The communication channel between the mobile terminal and the source radio base station after the communication path is established is disconnected.
【０００６】本発明においては、移動端末が移動元無線
基地局の受信品質または受信レベルの劣化を検出し、か
つ周辺に一定以上の受信品質または受信レベルの無線信
号を受信できる移動先無線基地局が存在することを検出
すると、移動端末から移動先無線基地局に対して、前記
割り当てられた他の１つの通話チャネルを割り当てるた
めの通話チャネル接続要求信号を送信し、この通話チャ
ネル接続要求信号を受信した移動先無線基地局に前記他
の１つの通話チャネルに対応する通話チャネルに空きが
ある時は移動端末に対し接続応答信号を送信して、前記
他の１つの通話チャネルによる通話路を確立し、この通
話チャネルで移動端末と移動先無線基地局間の通信を継
続させる。そして、前記通話路が確立された後の移動端
末と移動元無線基地局の通話チャネルを切断する。ま
た、通話チャネル接続要求信号を受信した移動先無線基
地局に他方の通話チャネルに対応する通話チャネルに空
きがない時は、一定以上の受信品質または受信レベルの
無線信号を受信できる他の移動先無線基地局に対して、
この移動先無線基地局から接続応答信号が返送されるま
で通話チャネル接続要求を繰り返して行う。よって、本
発明によれば、無音時間のないハンドオーバ処理が可能
になるとともに、一定以上の受信品質または受信レベル
の無線信号を受信できる他の移動先無線基地局に対し、
接続応答信号が返送されるまで通話チャネル接続要求を
繰り返し行うことができる。According to the present invention, a mobile terminal detects a deterioration in reception quality or reception level of a source radio base station, and a target radio base station capable of receiving a radio signal of a predetermined or higher reception quality or reception level in the vicinity. When the mobile terminal detects that the communication channel is present, the mobile terminal transmits a communication channel connection request signal for allocating the other one of the allocated communication channels to the movement target radio base station. If the received destination radio base station has a vacant communication channel corresponding to the other one of the communication channels, a connection response signal is transmitted to the mobile terminal to establish a communication channel using the other one of the communication channels. Then, the communication between the mobile terminal and the destination wireless base station is continued on this communication channel. Then, the communication channel between the mobile terminal and the source radio base station after the communication path is established is disconnected. If there is no free space in the communication channel corresponding to the other communication channel in the target wireless base station that has received the communication channel connection request signal, the other mobile station that can receive a radio signal with a reception quality or reception level of a certain level or more is received. For radio base stations,
The communication channel connection request is repeated until a connection response signal is returned from the destination radio base station. Therefore, according to the present invention, it is possible to perform a handover process without silence time, and for another destination radio base station that can receive a radio signal with a reception quality or reception level of a certain level or more,
The communication channel connection request can be repeatedly performed until the connection response signal is returned.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図１ないし図４を参照して説明する。図１は本発明
のハンドオーバー制御方法を適用したデジタルコードレ
ス電話システムの概略構成図、図２は本発明の実施の形
態における移動端末の内部構成を示すブロック図、図３
は本発明の実施の形態における無線基地局の内部構成を
示すブロック図、図４は本発明の実施の形態におけるハ
ンドオーバ処理のシーケンス図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a digital cordless telephone system to which a handover control method of the present invention is applied, FIG. 2 is a block diagram showing an internal configuration of a mobile terminal according to an embodiment of the present invention, and FIG.
Is a block diagram showing the internal configuration of the radio base station according to the embodiment of the present invention, and FIG. 4 is a sequence diagram of a handover process according to the embodiment of the present invention.
【０００８】図１において、１及び２はＰＨＳのような
デジタルコードレス電話システムにおけるセルラー方式
の小無線ゾーン３、４を構成する無線基地局であり、こ
の各無線基地局１、２は基地局制御装置５を介して公衆
網６に接続されている。７は無線基地局１または２と無
線通信を行うＰＨＳ等の移動端末であり、この移動端末
７には２つの通話チャネルが割り当てられる構成になっ
ている。上記２つの通話チャネルのうち、一方の通話チ
ャネルは、例えば、移動端末７が在圏する無線基地局１
との通話に使用され、他方の通話チャネルは、在圏する
無線基地局１からの受信レベルまたは受信品質が劣化
し、かつ隣接する無線基地局２からの受信レベルまたは
受信品質が一定値以上になった時点で無線基地局２と移
動端末７との通話に使用される。In FIG. 1, reference numerals 1 and 2 denote radio base stations constituting small radio zones 3 and 4 of a cellular system in a digital cordless telephone system such as a PHS. It is connected to a public network 6 via a device 5. Reference numeral 7 denotes a mobile terminal such as a PHS for performing wireless communication with the wireless base station 1 or 2, and the mobile terminal 7 is configured to be assigned two communication channels. One of the two communication channels is, for example, the radio base station 1 in which the mobile terminal 7 is located.
The other communication channel is used to reduce the reception level or reception quality from the serving wireless base station 1 and the reception level or reception quality from the adjacent wireless base station 2 to a certain value or more. At this point, it is used for a call between the wireless base station 2 and the mobile terminal 7.
【０００９】上記移動端末７は、図２に示すように、移
動端末７全体を制御するＣＰＵ（中央制御部）７０１
と、無線基地局１または２との通信を行う無線部７０２
と、ＣＰＵ７０１及び無線部７０２に接続され、無線基
地局との無線回線接続・通話チャネル切替え・無線部７
０２とサウンダ７０３、マイクロホン７０４及びスピー
カ７０５間での音声信号処理などを行うデジタル信号処
理部７０６と、ＣＰＵ７０１に接続され、ハンドオーバ
ー処理プログラムや受信レベル及び受信品質の判定プロ
グラム、及びＣＰＵ７０１での演算結果等のデータを格
納するメモリ７０７と、ＣＰＵ７０１に接続され、キー
ボード７０８の操作に伴い入力される電話番号等の信号
を処理してＣＰＵ７０１に送出する入力インタフェース
回路７０９と、無線部７０２で受信された無線信号（キ
ャリア）から電界強度を検出する電界強度検出回路７１
０を備え、電界強度検出回路７１０で検出された電界強
度信号はＣＰＵ７０１に取り込まれる構成になってい
る。また、７１１はＣＰＵ７０１に接続されたＬＣＤ等
の表示部である。As shown in FIG. 2, the mobile terminal 7 has a CPU (central control unit) 701 for controlling the entire mobile terminal 7.
And a radio unit 702 for communicating with the radio base station 1 or 2
Connected to the CPU 701 and the radio unit 702 to connect to a radio base station, switch a communication channel,
02, a digital signal processing unit 706 that performs audio signal processing between the sounder 703, the microphone 704, and the speaker 705, and a handover processing program, a reception level and reception quality determination program, and a calculation performed by the CPU 701. A memory 707 for storing data such as a result, an input interface circuit 709 connected to the CPU 701 and processing a signal such as a telephone number input by operating the keyboard 708 and transmitting the signal to the CPU 701, and a signal received by the wireless unit 702. Electric field strength detection circuit 71 for detecting the electric field strength from the transmitted radio signal (carrier)
0, and the electric field intensity signal detected by the electric field intensity detection circuit 710 is taken into the CPU 701. Reference numeral 711 denotes a display unit such as an LCD connected to the CPU 701.
【００１０】上記無線基地局１、２は、図３に示すよう
に、無線基地局１、２の交換制御や位置情報を管理する
基地局制御装置５に回線１０１を介して接続され、基地
局制御装置５を含む上位網との間でデータを送受する回
線インタフェース部１０２と、この回線インタフェース
部１０２に接続された変復調部１０３と、この変復調部
１０３に接続され、変復調部１０３とアンテナ１０４間
での無線信号の送受を行うアンテナインタフェース部１
０５と、これらを制御する制御部１０６とから構成され
ている。As shown in FIG. 3, the radio base stations 1 and 2 are connected via a line 101 to a base station controller 5 for controlling the exchange of radio base stations 1 and 2 and managing position information. A line interface unit 102 for transmitting and receiving data to and from a higher-level network including the control device 5, a modem unit 103 connected to the line interface unit 102, and a modem unit 103 connected to the modem unit 103 for communication between the modem unit 103 and the antenna 104. Interface unit 1 for transmitting and receiving wireless signals in the network
And a control unit 106 for controlling these.
【００１１】次に、上記のように構成された本実施の形
態におけるハンドオーバー動作について、図４を参照し
て説明する。この場合、無線基地局１を移動元無線基地
局とし、無線基地局２を移動先無線基地局として述べ
る。割り当てられた一方の通話チャネルＡで通話中の移
動端末７が無線基地局１の無線ゾーン３から無線基地局
２の無線ゾーン４へ移動しつつある時、移動端末７の電
界強度検出回路７１０が無線部７０２で受信した無線基
地局１及び２からの受信信号から電界強度をそれぞれ検
出し、これらの検出信号をＣＰＵ７０１に送出する。Next, the handover operation in the present embodiment configured as described above will be described with reference to FIG. In this case, the wireless base station 1 will be described as a source wireless base station, and the wireless base station 2 will be described as a destination wireless base station. When the mobile terminal 7 talking on one of the assigned communication channels A is moving from the wireless zone 3 of the wireless base station 1 to the wireless zone 4 of the wireless base station 2, the electric field strength detection circuit 710 of the mobile terminal 7 The electric field strength is detected from the received signals from the radio base stations 1 and 2 received by the radio unit 702, and these detected signals are sent to the CPU 701.
【００１２】次に、ＣＰＵ７０１では、上記検出信号か
ら移動元無線基地局１の受信品質または受信レベルが劣
化したかを判定し、受信品質または受信レベルの劣化が
検出された場合は、さらに、周辺に一定以上の受信品質
または受信レベルの無線信号を受信できる移動先無線基
地局が存在するかを判定する。一定以上の受信品質また
は受信レベルの無線信号を受信できる移動先無線基地局
２の存在が検出され、かつ上記移動元無線基地局１の受
信品質または受信レベルの劣化が検出されると、移動元
無線基地局１は他方の通話チャネルＢに付随する制御チ
ャネルで、移動先無線基地局２に対して、他方の通話チ
ャネルＢを割り当てるための通話チャネル接続要求信号
Ｓ１を送信する。Next, the CPU 701 determines from the detection signal whether the reception quality or the reception level of the source radio base station 1 has been degraded. It is determined whether there is a target wireless base station that can receive a wireless signal having a reception quality or reception level equal to or higher than a predetermined value. When the presence of the destination radio base station 2 that can receive a radio signal with a reception quality or reception level equal to or higher than a certain level is detected, and the deterioration of the reception quality or the reception level of the source radio base station 1 is detected, the source The radio base station 1 transmits a communication channel connection request signal S1 for allocating the other communication channel B to the destination radio base station 2 on a control channel associated with the other communication channel B.
【００１３】上記通話チャネル接続要求信号Ｓ１を受信
した移動先無線基地局２では、他方の通話チャネルＢに
対応する通話チャネルに空きがあるどうかを判定し、空
きがある場合は、他方の通話チャネルに付随する制御チ
ャネルで、移動先無線基地局２から移動端末７に対し通
話チャネル接続応答信号Ｓ２を送信する。そして、移動
端末７が通話チャネル接続応答信号Ｓ２を受信した時
は、移動元無線基地局１から基地局制御装置５を含む上
位網へハンドオーバー処理の実行を要求するとともに、
移動先無線基地局２との他方の通話チャネルＢによる通
話路を確立させ、この通話チャネルＢで移動端末７と移
動先無線基地局２間の通信を継続させる。The destination radio base station 2 having received the above-mentioned traffic channel connection request signal S1 determines whether or not there is a vacancy in the traffic channel corresponding to the other traffic channel B. The communication channel connection response signal S2 is transmitted from the destination radio base station 2 to the mobile terminal 7 on the control channel associated with When the mobile terminal 7 receives the communication channel connection response signal S2, the source wireless base station 1 requests the upper network including the base station controller 5 to execute a handover process,
A communication path is established with the destination wireless base station 2 using the other communication channel B, and communication between the mobile terminal 7 and the destination wireless base station 2 is continued on the communication channel B.
【００１４】また、通話チャネルＢでの通話路が確立さ
れた後は、移動端末７から移動元無線基地局１に対し
て、一方の通話チャンネルＡに付随する制御チャネルで
通話チャネル切断要求信号Ｓ３を送信し、移動端末７と
移動元無線基地局１の通話チャネルＡの切断を開始す
る。そして、移動端末７が移動元無線基地局１からの通
話チャネル切断応答信号Ｓ４を受信すると、移動端末７
は移動元無線基地局１に対して通話チャネル切断完了信
号Ｓ５を送信し、移動端末７が通話チャネルＡの切断を
完了したことを通知する。After the communication channel on the communication channel B is established, the mobile terminal 7 sends the communication channel disconnection request signal S3 to the source radio base station 1 using the control channel associated with one of the communication channels A. To start disconnection of the communication channel A between the mobile terminal 7 and the source radio base station 1. When the mobile terminal 7 receives the communication channel disconnection response signal S4 from the source wireless base station 1, the mobile terminal 7
Transmits a communication channel disconnection completion signal S5 to the source radio base station 1 to notify that the mobile terminal 7 has completed disconnection of the communication channel A.
【００１５】また、本発明の実施の形態においては、通
話チャネル接続要求信号Ｓ１を受信した移動先無線基地
局２に他方の通話チャネルＢに対応する通話チャネルに
空きがない時は、一定以上の受信品質または受信レベル
の無線信号を受信できる他の移動先無線基地局に対し
て、この移動先無線基地局から接続応答信号が返送され
るまで通話チャネル接続要求を繰り返して行う。また、
本発明の実施の形態においては、通話チャネル接続要求
信号Ｓ１を受けた各移動先無線基地局に他方の通話チャ
ネルに対応する通話チャネルの空きが存在しない時はハ
ンドオーバー処理を停止させる。Further, in the embodiment of the present invention, when there is no free space in the communication channel corresponding to the other communication channel B in the destination radio base station 2 which has received the communication channel connection request signal S1, the predetermined value or more is set. A call channel connection request is repeatedly made to another target radio base station that can receive a radio signal of reception quality or reception level until a connection response signal is returned from the target radio base station. Also,
In the embodiment of the present invention, the handover process is stopped when there is no available communication channel corresponding to the other communication channel in each target radio base station that has received the communication channel connection request signal S1.
【００１６】上記のような本実施の形態によれば、移動
端末７が移動元無線基地局１の受信品質または受信レベ
ルの劣化を検出し、かつ周辺に一定以上の受信品質また
は受信レベルの無線信号を受信できる移動先無線基地局
２が存在することを検出すると、移動端末７から移動先
無線基地局２に対して、他方の通話チャネルＢを割り当
てるための通話チャネル接続要求信号を送信し、この通
話チャネル接続要求信号を受信した移動先無線基地局１
に他方の通話チャネルＢに対応する通話チャネルに空き
がある時は移動端末７に対し応答信号を送信し、他方の
通話チャネルＢによる通話路を確立して、移動端末７と
移動先無線基地局１間の通信を継続させるとともに、通
話路が確立された後の移動端末７と移動元無線基地局１
の通話チャネルでの通話路を切断し、両方の通話チャネ
ルを別々の無線基地局に接続する構成にしたので、無音
時間のないハンドオーバ処理が可能になるとともに、移
動中に移動端末と通話相手との間の通話が突然に切れた
りして、両者間の通話に支障を来すのを未然に防止で
き、そして、通話チャネル接続要求信号Ｓ１を受信した
移動先無線基地局２に他方の通話チャネルＢに対応する
通話チャネルに空きがない時は、一定以上の受信品質ま
たは受信レベルの無線信号を受信できる他の移動先無線
基地局に対し、この移動先無線基地局から接続応答信号
が返送されるまで通話チャネル接続要求を繰り返し行う
ことができ、また、通話チャネル接続要求信号Ｓ１を受
けた各移動先無線基地局に他方の通話チャネルに対応す
る通話チャネルに空きがない時のハンドオーバー処理を
停止させることができる。According to the present embodiment as described above, mobile terminal 7 detects the deterioration of the reception quality or reception level of source radio base station 1, and detects a certain level of reception quality or reception level in the vicinity. When detecting that there is a destination radio base station 2 that can receive a signal, the mobile terminal 7 transmits a communication channel connection request signal for allocating the other communication channel B to the destination radio base station 2; The destination radio base station 1 that has received the call channel connection request signal
Transmits a response signal to the mobile terminal 7 when there is an available communication channel corresponding to the other communication channel B, establishes a communication path using the other communication channel B, and establishes a communication with the mobile terminal 7 and the destination radio base station. 1 and the mobile terminal 7 and the source wireless base station 1 after the communication path is established.
The communication path of the communication channel is disconnected, and both communication channels are connected to different radio base stations, so that handover processing without silence time becomes possible, and the mobile terminal and the other party can communicate with each other while moving. Can be prevented from suddenly dropping a call between the two, thereby hindering the call between them, and the other base station 2 receiving the call channel connection request signal S1 transmits the other call channel. When there is no available communication channel corresponding to B, a connection response signal is returned from the destination radio base station to another destination radio base station that can receive a radio signal of a predetermined or higher reception quality or reception level. The communication channel connection request can be repeatedly performed until the communication channel corresponding to the other communication channel is received. It is possible to stop the handover process when there is no.
【００１７】本発明は、上記の実施の形態に示すよう
に、ハンドオーバ処理に２つの通話チャネルを使用する
ことのみに限らず、他にも２つの通話チャネルを使用す
ることによって、以下に述べる機能を実現することが可
能になる。第１は、同一の無線基地局に２つの通話チャ
ネルを同時に接続することによって、一般の固定電話、
または携帯電話と同じようにキャッチホンサービスが可
能になる。この場合、１つの通話チャネルで通話を行
い、もう一方の通話チャネルで着信を受けることができ
る。この着信を取ったタイミングで元々通話していた通
話チャネルの通話パスを閉じ、もう一方の通話チャネル
の通話パスを開けば後から着信した人との通話が可能に
なる。The present invention is not limited to the use of two communication channels for the handover process as shown in the above embodiment, but also includes the following functions by using two other communication channels. Can be realized. First, by connecting two communication channels simultaneously to the same radio base station, a general fixed telephone,
Alternatively, a call waiting service can be provided in the same manner as a mobile phone. In this case, a call can be made on one communication channel and an incoming call can be received on the other communication channel. When the call is received, the communication path of the communication channel that originally communicated is closed, and the communication path of the other communication channel is opened, so that it becomes possible to communicate with a person who has received the call later.
【００１８】第２は、同一の無線基地局に２つの通話チ
ャネルを同時に接続することによって、一般の固定電
話、または携帯電話と同じように３者間通話が可能にな
る。この場合は、上記のキャッチホンサービス等により
接続されたもう一方の通話チャネルの通話パスと、元々
通話していた通話チャネルの通話パスを同時に開くこと
により可能になる。また、この実施の形態では２つの通
話チャネルであるので、３者間の通話であるが、ｎチャ
ネルに拡張された場合ではｎ＋１者間での通話が可能に
なる。Second, by simultaneously connecting two communication channels to the same radio base station, three-way communication becomes possible in the same manner as a general fixed telephone or mobile telephone. In this case, it is possible to simultaneously open the communication path of the other communication channel connected by the above-mentioned call waiting service and the communication path of the communication channel that originally used the communication. Further, in this embodiment, since there are two communication channels, the communication is between three parties. However, when the communication channel is expanded to n channels, the communication between n + 1 parties becomes possible.
【００１９】第３は、同一の無線基地局に２つの通話チ
ャネルを同時に接続することによって、データ通信と音
声通話とを同時に行うことが可能になる。この場合は、
一方の通話チャネルで音声通話を行い、もう一方の通話
チャネルでデータ通信を行うことによって可能になる。Third, by simultaneously connecting two communication channels to the same radio base station, data communication and voice communication can be performed simultaneously. in this case,
This is possible by making a voice call on one communication channel and performing data communication on the other communication channel.
【００２０】[0020]
【発明の効果】以上のように本発明によれば、無音時間
のないハンドオーバ処理が可能になるとともに、移動中
に移動端末と通話相手との間の通話が突然に切れたりし
て、両者間の通話に支障を来すのを未然に防止でき、ま
た、一定以上の受信品質または受信レベルの無線信号を
受信できる他の移動先無線基地局に対し、接続応答信号
が返送されるまで通話チャネル接続要求を繰り返し行う
ことができる。また、本発明によれば、移動端末に少な
くとも２つの通話チャネルを割り当てることにより、キ
ャッチホンサービスが可能になるとともに、３者または
それ以上の間での通話も可能になり、さらに、データ通
信と音声通話とを同時に行うことができる。As described above, according to the present invention, it is possible to perform a handover process without silence time, and a call between a mobile terminal and a communication partner is suddenly cut off while moving, and Call channel until another connection response signal is returned to another destination base station that can receive a radio signal with a certain level of reception quality or reception level. Connection requests can be made repeatedly. Also, according to the present invention, by allocating at least two communication channels to a mobile terminal, a call waiting service is enabled, and a call between three or more parties is enabled. Calls can be made at the same time.
【図１】本発明のハンドオーバー制御方法を適用したデ
ジタルコードレス電話システムの概略構成図である。FIG. 1 is a schematic configuration diagram of a digital cordless telephone system to which a handover control method of the present invention is applied.
【図２】本発明の実施の形態における移動端末の内部構
成を示すブロック図である。FIG. 2 is a block diagram showing an internal configuration of a mobile terminal according to the embodiment of the present invention.
【図３】本発明の実施の形態における無線基地局の内部
構成を示すブロック図である。FIG. 3 is a block diagram showing an internal configuration of a radio base station according to the embodiment of the present invention.
【図４】本発明の実施の形態におけるハンドオーバ処理
のシーケンス図である。FIG. 4 is a sequence diagram of a handover process according to the embodiment of the present invention.
１、２……無線基地局、３、４……無線ゾーン、５……
基地局制御装置、６……公衆網、７……移動端末、７０
１……ＣＰＵ（中央制御部）、７０２……無線部、７０
６……デジタル信号処理部、７０７……メモリ、７０９
……入力インタフェース回路、７１０……電界強度検出
回路。1, 2, ... wireless base station, 3, 4, ... wireless zone, 5 ...
Base station control device, 6 public network, 7 mobile terminal, 70
1. CPU (Central Control Unit) 702 Radio Unit 70
6 Digital signal processing unit 707 Memory 709
... An input interface circuit, and 710 an electric field strength detection circuit.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−284145（ＪＰ，Ａ) 特開 平10−145335（ＪＰ，Ａ) 特開 平10−13914（ＪＰ，Ａ) 特開 平10−200548（ＪＰ，Ａ) 特開 平６−276147（ＪＰ，Ａ) 特開 平６−105371（ＪＰ，Ａ) 特開 平８−154269（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/24 - 7/26 H04Q 7/04 - 7/38 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-284145 (JP, A) JP-A-10-145335 (JP, A) JP-A-10-13914 (JP, A) JP-A-10- 200548 (JP, A) JP-A-6-276147 (JP, A) JP-A-6-105371 (JP, A) JP-A 8-154269 (JP, A) (58) Fields investigated (Int. 7 , DB name) H04B 7/ 24-7/26 H04Q 7 /04-7/38
Claims (4)
チャネルで無線信号を送受信する複数の無線基地局を備
え、前記移動端末が通話しながら前記無線基地局の無線
ゾーン間を移動する時、一定以上の受信品質または受信
レベルの無線信号を受信できる無線基地局に切り替えて
通信を継続させるハンドオーバー制御方法であって、 前記移動端末に少なくとも２つの通話チャネルを割り当
て、 前記移動端末が前記割り当てられた１つの通話チャネル
で通話中である無線ゾーンの無線基地局を移動元無線基
地局とし、かつ該移動元の無線基地局に近接する周辺の
無線基地局を移動先無線基地局とし、 前記移動端末の移動に伴い、該移動端末が移動元無線基
地局の受信品質または受信レベルの劣化を検出し、かつ
周辺に一定以上の受信品質または受信レベルの無線信号
を受信できる移動先無線基地局が存在することを検出し
た時に移動端末から前記移動先無線基地局に対して、前
記割り当てられた他の１つの通話チャネルを割り当てる
ための通話チャネル接続要求信号を送信し、 前記通話チャネル接続要求信号を受信した前記移動先無
線基地局に前記他の１つの通話チャネルに対応する通話
チャネルに空きがある時は前記移動端末に対し接続応答
信号を送信し、 前記通話チャネル接続要求信号を受信した前記移動先無
線基地局に前記他の１つの通話チャネルに対応する通話
チャネルに空きがない時は、一定以上の受信品質または
受信レベルの無線信号を受信できる他の移動先無線基地
局から接続応答信号が返送されるまで通話チャネル接続
要求が繰り返されるようにし、 前記移動端末が接続応答信号を受信した時は前記他の１
つの通話チャネルによる通話路を確立して該通話チャネ
ルで移動端末と移動先無線基地局間の通信を継続させ、 前記通話路が確立された後の前記移動端末と前記移動元
無線基地局の通話チャネルを切断する、 ことを特徴とするハンドオーバー制御方法。1. A mobile terminal, comprising: a plurality of radio base stations for transmitting and receiving radio signals via a communication channel between the mobile terminal; wherein the mobile terminal moves between radio zones of the radio base station while making a call. A handover control method for switching to a radio base station capable of receiving a radio signal of a predetermined or higher reception quality or reception level and continuing communication, wherein at least two communication channels are allocated to the mobile terminal; A radio base station in a radio zone in which a call is being made on one of the allocated communication channels is a source radio base station, and a radio base station in the vicinity of the source radio base station is a destination radio base station. Along with the movement of the mobile terminal, the mobile terminal detects the deterioration of the reception quality or reception level of the source radio base station, and the reception quality of a certain level or more around A communication channel for allocating the other one of the allocated communication channels from the mobile terminal to the target radio base station when detecting that there is a target radio base station capable of receiving a radio signal of a reception level Transmitting a connection request signal, and transmitting a connection response signal to the mobile terminal when the target radio base station receiving the communication channel connection request signal has an available communication channel corresponding to the another one of the communication channels. Transmitting, when the target radio base station receiving the communication channel connection request signal has no available communication channel corresponding to the another communication channel, a radio signal having a reception quality or reception level equal to or higher than a predetermined value. Other target radio bases that can be received
As a station or al connection response signal is repeated a call channel connection request until the back, 1 when the mobile terminal receives the connection response signal of the other
A communication path is established by two communication channels, communication between the mobile terminal and the destination radio base station is continued on the communication channel, and communication between the mobile terminal and the source radio base station after the communication path is established. A handover control method, comprising disconnecting a channel.
つの通話チャネルで 通話を行っている時に、前記他の１
つの通話チャネルで着信を受付け、この着信を取ったタ
イミングで前記通話中の通話チャネルの通話路を閉じ、
前記他の１つの通話チャネルの通話路を開いてキャッチ
ホンサービスを行うことを特徴とする請求項１記載のハ
ンドオーバー制御方法。2. The mobile terminal, wherein the mobile terminal
While talking on one call channel, the other 1
The incoming call on one of the call channels, and
Closing the communication path of the communication channel during the call during the imaging,
Open and catch the other one of the communication channels
Handover control method according to claim 1 Symbol placement and performs the service.
話チャネルを通話中の無線基地局に同時に接続し、各通
話チャネルの通話路を同時に開くことにより複数者間の
通話を行うことを特徴とする請求項１記載のハンドオー
バー制御方法。3. The mobile terminal according to claim 2, wherein said plurality of communication terminals are assigned to a plurality of mobile terminals.
Talk channel is simultaneously connected to the wireless base station that is
Opening the channel of the talk channel at the same time
Handover control method according to claim 1 Symbol placement and performing a call.
話チャネルを通話中の無線基地局に同時に接続し、上記
各通話チャネルの通話路を同時に開くことにより、１つ
の通話チャネルを通話に使用し、他の通話チャネルをデ
ータ通信に使用することを特徴とする請求項１記載のハ
ンドオーバー制御方法。 4. A communication system according to claim 1, wherein said plurality of communication terminals are assigned to said mobile terminal.
Simultaneously connect the talk channel to the base transceiver station
By simultaneously opening the communication paths of each communication channel, one
Use one call channel for calls and
Handover control method according to claim 1 Symbol placement, characterized by using the Data Communications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3371799A JP3076320B1 (en) | 1999-02-12 | 1999-02-12 | Handover control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3371799A JP3076320B1 (en) | 1999-02-12 | 1999-02-12 | Handover control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3076320B1 true JP3076320B1 (en) | 2000-08-14 |
| JP2000232672A JP2000232672A (en) | 2000-08-22 |
Family
ID=12394168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3371799A Expired - Fee Related JP3076320B1 (en) | 1999-02-12 | 1999-02-12 | Handover control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3076320B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0508153A (en) * | 2004-03-10 | 2007-08-07 | Sk Telecom Co Ltd | intersystem handover |
| JP5187394B2 (en) | 2008-05-19 | 2013-04-24 | 日本電気株式会社 | Mobile communication system, mobile station, base station, handover control method |
| JP7024496B2 (en) * | 2018-02-27 | 2022-02-24 | サクサ株式会社 | Telephone control device |
-
1999
- 1999-02-12 JP JP3371799A patent/JP3076320B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000232672A (en) | 2000-08-22 |
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