JP2731708B2 - Alternate call connection control method for mobile communication systems - Google Patents

Alternate call connection control method for mobile communication systems

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Publication number
JP2731708B2
JP2731708B2 JP5263969A JP26396993A JP2731708B2 JP 2731708 B2 JP2731708 B2 JP 2731708B2 JP 5263969 A JP5263969 A JP 5263969A JP 26396993 A JP26396993 A JP 26396993A JP 2731708 B2 JP2731708 B2 JP 2731708B2
Authority
JP
Japan
Prior art keywords
signal
call connection
base station
connection request
request signal
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
Application number
JP5263969A
Other languages
Japanese (ja)
Other versions
JPH07123460A (en
Inventor
博文 塩月
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.)
NIPPON DENKI TSUSHIN SHISUTEMU KK
Original Assignee
NIPPON DENKI TSUSHIN SHISUTEMU KK
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 NIPPON DENKI TSUSHIN SHISUTEMU KK filed Critical NIPPON DENKI TSUSHIN SHISUTEMU KK
Priority to JP5263969A priority Critical patent/JP2731708B2/en
Publication of JPH07123460A publication Critical patent/JPH07123460A/en
Application granted granted Critical
Publication of JP2731708B2 publication Critical patent/JP2731708B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To improve the success rate of call connection by making a call connecting request signal a valid signal at a radio base station, which receives a call connecting request signal from a mobile terminal positioned outside the service area of the present station, even when the call connecting request signal is an alternative signal. CONSTITUTION:A mobile object telephone exchange transmits an alternation instruct signal for an adjacent radio base station 3 through the outgoing control channel of a base station 4 to a mobile object telephone terminal 7 since all the channels of the radio base station 4 receiving a call connecting request signal S1 are busy. The terminal 7, to which the alternative transmission of the signal S1 is instructed, is turned with the outgoing control channel of the base station 3, then it is displayed that the alternation information in the signal S1 is the alternative signal, and the signal S1 is transmitted to the incoming control channel of the base station 3. The exchange receiving the signal S1 selects one channel out of non-used channels provided at the base station 3 sending the signal S1, and this is assigned to the speaking of the terminal 7 and the signal is transmitted from the exchange 1 to the terminal 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は移動体通信システムの迂
回呼接続制御方式に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternate call connection control system for a mobile communication system.

【0002】[0002]

【従来の技術】従来、移動体通信システムにおいて行わ
れてきた上り制御チャネルのオーバーリーチ防止制御と
迂回呼接続制御とについて、図1に示す移動体通信シス
テムのシステム構成図を参照して説明する。
2. Description of the Related Art Uplink prevention control and alternate call connection control of an uplink control channel conventionally performed in a mobile communication system will be described with reference to a system configuration diagram of a mobile communication system shown in FIG. .

【0003】この移動体通信システムは、セルラー方式
の移動体通信システムであり、複数の通話サービスの提
供エリア,即ちサービスエリア21,…,31,41,
…,および51を含む。サービスエリア21,31,4
1および51の各各には、無線基地局2,3,4および
5がそれぞれ配置されている。なお、上記サービスエリ
ア群の中で、エリア31とエリア41だけが隣接するサ
ービスエリアであり、また無線基地局2と無線基地局4
には同じ周波数の制御チャネルが割当られているものと
する。無線基地局2,3,4および5の各各は、制御信
号線と通話線との集合である集合線10により移動体電
話交換局1にそれぞれ接続されている。また、この移動
体通信システムは、上記サービスエリア群を自由に移動
可能な移動体電話端末6,7および図示しない複数の移
動体電話端末を含む。
[0003] This mobile communication system is a cellular mobile communication system in which a plurality of communication service providing areas, that is, service areas 21, ..., 31, 41,.
…, And 51. Service areas 21, 31, 4
Radio base stations 2, 3, 4, and 5 are arranged in each of 1 and 51, respectively. In the above service area group, only the area 31 and the area 41 are adjacent service areas, and the radio base station 2 and the radio base station 4
Are assigned control channels of the same frequency. Each of the radio base stations 2, 3, 4 and 5 is connected to the mobile telephone exchange 1 by a collective line 10 which is a set of a control signal line and a communication line. The mobile communication system includes mobile telephone terminals 6 and 7 that can freely move in the service area group and a plurality of mobile telephone terminals (not shown).

【0004】いま、移動体電話端末7が、サービスエリ
ア41内に存在し、無線基地局4の下り制御チャネルに
同調しながら移動体電話交換局1からの呼出し待ちを行
っている。また、無線基地局4の保有するすべての通話
チャネルは、移動体電話端末7以外の移動体電話端末へ
の通話サービス提供のために使用中であるとする。
[0004] A mobile telephone terminal 7 is present in a service area 41 and waits for a call from the mobile telephone exchange 1 while tuning to the downlink control channel of the radio base station 4. It is also assumed that all the communication channels held by the radio base station 4 are being used for providing a communication service to mobile telephone terminals other than the mobile telephone terminal 7.

【0005】上述のシステム状態において、移動体電話
端末7が発呼あるいは着呼動作を行うと、無線基地局
4,移動体電話交換局1および無線基地局3は、以下に
述べる上り制御チャネルのオーバーリーチ防止制御およ
び迂回呼接続制御を行う。
In the above-mentioned system state, when the mobile telephone terminal 7 performs a calling or receiving operation, the radio base station 4, the mobile telephone exchange 1 and the radio base station 3 transmit the uplink control channel described below. It performs overreach prevention control and alternate call connection control.

【0006】まず、上り制御チャネルのオーバーリーチ
防止制御について説明する。
[0006] First, control for preventing overreach of the uplink control channel will be described.

【0007】無線基地局2ないし5の各各は、上り制御
チャネルに対する予め決定された信号受信有効電界レベ
ルしきい値(以下、電界レベルしきい値と呼称する)を
保有する。電界レベルしきい値としては、サービスエリ
ア21,31,41および51の各各にそれぞれ存在す
る移動体電話端末から無線基地局2,3,4および5の
各各がそれぞれ受信できる電界レベルの最小値を設定す
る。無線基地局が移動体電話端末から受信する上り制御
チャネルの信号受信電界レベルと両者間の距離とには反
比例の関係があるので、最小の信号受信電界レベルとな
る地域は、サービスエリア内において無線基地局から最
も遠いサービスエリア境界域にあると言える。したがっ
て、上記電界レベルしきい値はサービスエリア境界域に
存在する移動体電話端末から無線基地局が受信できる信
号受信電界レベル値であるとも言える。
Each of the radio base stations 2 to 5 has a predetermined signal reception effective electric field level threshold (hereinafter referred to as an electric field level threshold) for the uplink control channel. The electric field level threshold is the minimum electric field level that can be received by each of the radio base stations 2, 3, 4 and 5 from the mobile telephone terminals respectively existing in the service areas 21, 31, 41 and 51. Set the value. Since there is an inverse relationship between the signal reception electric field level of the uplink control channel received by the radio base station from the mobile telephone terminal and the distance between the two, the area where the minimum signal reception electric field level is located within the service area It can be said that it is in the service area boundary area farthest from the base station. Therefore, it can be said that the electric field level threshold value is a signal reception electric field level value that can be received by the radio base station from the mobile telephone terminal existing in the service area boundary area.

【0008】ここで、無線基地局2と無線基地局4と
が、この移動体通信システム特有の技術である周波数再
利用によって同じ周波数の制御チャネルを割当てられて
いる。この場合、無線基地局2のサービスエリア21内
に存在する移動体電話端末6からの上り制御チャネル信
号が、無線基地局2と無線基地局4とで同時に受信され
る事が起こり得る。これを上り制御チャネルのオーバー
リーチと言う。
[0008] Here, the radio base station 2 and the radio base station 4 are assigned control channels of the same frequency by frequency reuse which is a technique unique to the mobile communication system. In this case, it is possible that the radio base station 2 and the radio base station 4 simultaneously receive the uplink control channel signal from the mobile telephone terminal 6 existing in the service area 21 of the radio base station 2. This is called uplink control channel overreach.

【0009】図1の移動体通信システムにおいて、受信
したすべての上り制御チャネル信号を無線基地局2ない
し5の各各が無条件に移動体電話交換局1に中継したと
すると、上り制御チャネルのオーバーリーチが発生した
場合に移動体電話交換局1は一つの移動体電話端末,例
えば移動体電話端末6からの呼接続要求信号を上記の複
数の無線基地局2〜5から受信する事となり、移動体電
話交換局1の呼接続(通話サービスの提供)制御動作は
複雑なものとなる。
In the mobile communication system shown in FIG. 1, if each of the radio base stations 2 to 5 unconditionally relays all the received uplink control channel signals to the mobile telephone exchange 1, the uplink control channel signal When overreach has occurred, the mobile telephone exchange 1 receives a call connection request signal from one mobile telephone terminal, for example, the mobile telephone terminal 6, from the plurality of radio base stations 2 to 5, The operation of controlling the call connection (providing the call service) of the mobile telephone exchange 1 becomes complicated.

【0010】上り制御チャネルのオーバーリーチ発生を
無線基地局2ないし5の各各において防止するために、
上記電界レベルしきい値が活用される。上記各無線基地
局は、上り制御チャネル信号を受信すると、この信号の
受信電界レベル(信号受信電界レベル)を常に測定す
る。上り制御チャネル信号の受信が完了すると、上記各
無線基地局は上記信号受信電界レベルの測定値(以下、
測定値と呼称する)と上記電界レベルしきい値とを比較
し、上記測定値が上記電界レベルしきい値以上であれば
受信した上り制御チャネル信号が自身の属するサービス
エリア内に存在する移動体電話端末から受信したもので
あるとして、上記上り制御チャネルの信号を移動体電話
交換局1に中継する。一方、上記測定値が電界レベルし
きい値未満であると、上記各無線基地局は、自身の属す
るサービスエリア外に存在する移動体電話端末から上り
制御チャネルの信号を受信した,つまり上り制御チャネ
ルのオーバーリーチが発生したと判断して、受信した上
り制御チャネル信号を破棄する。
To prevent the occurrence of overreach of the uplink control channel in each of the radio base stations 2 to 5,
The electric field level threshold is utilized. When each of the above radio base stations receives the uplink control channel signal, it always measures the reception electric field level (signal reception electric field level) of this signal. When the reception of the uplink control channel signal is completed, each of the radio base stations measures the signal reception electric field level (hereinafter, referred to as the signal reception electric field level)
A mobile unit in which the received uplink control channel signal is present in its own service area if the measured value is equal to or greater than the electric field level threshold. Assuming that the signal has been received from the telephone terminal, the signal of the uplink control channel is relayed to the mobile telephone exchange 1. On the other hand, if the measured value is less than the electric field level threshold, each of the radio base stations receives a signal of the uplink control channel from a mobile telephone terminal existing outside its service area, that is, the uplink control channel. , And discards the received uplink control channel signal.

【0011】例えば、移動体電話端末6の送信した上り
制御チャネル信号を無線基地局2と4とが受信した場合
には、移動体電話端末6がサービスエリア21内に存在
するので上記測定値が上記電界レベルしきい値以上であ
り、無線基地局2では受信した上記上りチャネル制御信
号を有効信号として扱い、この信号を移動体電話交換局
1に中継送信する。一方、無線基地局4は、上記測定値
が上記電界レベルしきい値未満であるため、移動体電話
端末6がサービスエリア41外に存在するとして、受信
した上記上り制御チャネル信号をオーバーリーチ信号と
して破棄する。上述の無線基地局2および4の動作によ
って、移動体電話端末6は呼接続期待局である無線基地
局2を介して移動体電話交換局1から通話サービスの提
供を受けることができる。
For example, when the radio base stations 2 and 4 receive the uplink control channel signal transmitted from the mobile telephone terminal 6, the above measured value is obtained because the mobile telephone terminal 6 exists in the service area 21. The radio base station 2 treats the received uplink channel control signal as a valid signal, which is equal to or higher than the electric field level threshold, and relays this signal to the mobile telephone exchange 1. On the other hand, since the measured value is less than the electric field level threshold, the radio base station 4 determines that the mobile telephone terminal 6 exists outside the service area 41 and uses the received uplink control channel signal as an overreach signal. Discard. By the operations of the radio base stations 2 and 4 described above, the mobile telephone terminal 6 can receive the call service from the mobile telephone exchange 1 via the radio base station 2 which is a call connection expecting station.

【0012】次に、迂回呼接続制御について説明する。Next, the alternate call connection control will be described.

【0013】図1の移動体通信システムにおいて、移動
体電話端末7が呼接続要求を行う場合には、移動体電話
端末7は無線基地局4の上り制御チャネル上に呼接続要
求信号を送信する。無線基地局4は、移動体電話端末7
からの呼接続要求信号を自身のサービスエリア41内か
らの受信であるとして、この信号を移動体電話交換局1
に中継送信する。無線基地局4に未使用の通話チャネル
が存在すれば、移動体電話交換局1は移動体電話端末7
に対して上記未使用通話チャネルの割当てを行う。一
方、無線基地局4のすべての通話チャネルが他の移動体
電話端末の通話のために使用中である場合には、移動体
電話交換局1は、移動体電話端末7に対して無線基地局
4の近隣の無線基地局,図1では無線基地局3に再度呼
接続要求信号を送信する,つまり無線基地局の迂回を行
う様に、無線基地局4の下り制御チャネルを介して迂回
指示を行う。呼接続要求の迂回指示を受信した移動体電
話端末7は、この迂回指示に従い、無線基地局3の制御
チャネルに同調した後、無線基地局3に対して呼接続要
求信号を再送する。
In the mobile communication system shown in FIG. 1, when the mobile telephone terminal 7 makes a call connection request, the mobile telephone terminal 7 transmits a call connection request signal on the uplink control channel of the radio base station 4. . The radio base station 4 is a mobile telephone terminal 7
Is determined to be received from within its own service area 41, and this signal is sent to mobile telephone exchange 1
Relay transmission. If there is an unused communication channel in the radio base station 4, the mobile telephone exchange 1 sends the mobile telephone terminal 7
Are assigned to the unused communication channels. On the other hand, when all the communication channels of the radio base station 4 are being used for a call of another mobile telephone terminal, the mobile telephone exchange 1 sends the radio base station to the mobile telephone terminal 7. 1, a call connection request signal is transmitted again to the wireless base station 3 in FIG. 1, that is, a detour instruction is issued via the downlink control channel of the wireless base station 4 so as to perform a detour around the wireless base station. Do. Upon receiving the call connection request detour instruction, the mobile telephone terminal 7 tunes to the control channel of the radio base station 3 according to the detour instruction, and then retransmits the call connection request signal to the radio base station 3.

【0014】[0014]

【発明が解決しようとする課題】前述した従来の迂回呼
接続制御と上り制御チャネルのオーバーリーチ防止制御
とが共に有効に動作する移動体通信システムでは、上記
迂回呼接続制御によって移動体電話端末が呼接続要求信
号の再送を行うと、迂回先の無線基地局では、多くの場
合、自局のサービスエリア外からも呼接続要求の再送信
号を受信する事になり、移動体電話交換局の呼接続制御
動作が複雑なものになるという欠点があった。
SUMMARY OF THE INVENTION In a mobile communication system in which the above-described conventional alternate call connection control and uplink control channel overreach prevention control both operate effectively, the mobile telephone terminal is controlled by the alternate call connection control. When a call connection request signal is retransmitted, the detour destination radio base station often receives a call connection request retransmission signal from outside its own service area, and the mobile telephone exchange station calls There is a disadvantage that the connection control operation becomes complicated.

【0015】また、迂回先の無線基地局では、上り制御
チャネルのオーバーリーチ防止制御動作によって、サー
ビスエリア外から受信する事となる呼接続要求の再送信
号を破棄することが多くなり、通話サービスの提供を有
効に行えないという問題があた。
[0015] Further, the detour destination radio base station often discards a retransmission signal of a call connection request to be received from outside the service area due to an overreach prevention control operation of the uplink control channel, thereby increasing the call service. There was a problem that the provision could not be performed effectively.

【0016】[0016]

【課題を解決するための手段】本発明による移動体通信
システムの迂回呼接続制御方式は、複数のサービスエリ
アを移動可能な複数の移動体電話端末と、前記サービス
エリアごとに配置され前記移動体電話端末のいずれかか
ら上り制御チャネルを介して受けた呼接続要求信号のオ
ーバーリーチ防止制御を行う無線基地局と、集合線で前
記無線基地局に接続され前記呼接続要求信号を受信した
前記無線基地局に空きの通話チャネルが存在しない場合
には前記呼接続要求信号送信の前記移動体電話端末に対
する呼接続要求の迂回指示を前記無線基地局の下り制御
チャネルを介して行う移動体電話交換局とを含む移動体
通信システムの迂回呼接続制御方式において、前記移動
体電話端末が、前記移動体電話交換局の迂回指示に基づ
いて前記呼接続要求信号を送信する場合には、迂回信号
の表示をした前記呼接続要求信号を送信し、前記無線基
地局が、受信した前記呼接続要求信号が前記迂回信号の
表示がある場合には、前記呼接続要求信号をこの信号の
信号受信レベルに関係なく有効信号として前記移動体電
話交換局に中継送信する。
The alternate call connection control method for a mobile communication system according to the present invention comprises a plurality of mobile telephone terminals capable of moving in a plurality of service areas, and a plurality of mobile telephone terminals arranged for each of the service areas. A radio base station that performs overreach prevention control of a call connection request signal received from any of the telephone terminals via an uplink control channel, and the radio that is connected to the radio base station via a collective line and receives the call connection request signal A mobile telephone switching center for instructing the mobile telephone terminal to transmit the call connection request signal to bypass the call connection request via the downlink control channel of the radio base station when there is no free communication channel in the base station; In the alternative call connection control method for a mobile communication system, the mobile telephone terminal transmits the call connection request based on a bypass instruction from the mobile telephone exchange. When transmitting a signal, the call connection request signal indicating a bypass signal is transmitted, and when the received call connection request signal indicates the bypass signal, the radio base station transmits the call connection request signal. The connection request signal is relayed to the mobile telephone exchange as a valid signal regardless of the signal reception level of the signal.

【0017】[0017]

【実施例】次に、本発明について図面を参照して説明す
る。
Next, the present invention will be described with reference to the drawings.

【0018】図2は本発明の一実施例で使用される呼接
続要求信号のデータストリームを示す図である。
FIG. 2 is a diagram showing a data stream of a call connection request signal used in one embodiment of the present invention.

【0019】本実施例の移動通信システムにおける呼接
続要求信号S1は、信号識別番号S100と呼接続要求
情報S200およびS400と迂回信号情報S300と
データチェック情報S500とを含む。呼接続要求信号
S1の先頭に位置する信号識別情報S100は、発信要
求あるいは着信応答などの呼接続要求の種別を示してい
る。呼接続要求情報S200およびS400は、呼接続
要求のための諸情報である。信号S1の末尾に位置する
データチェック情報S500は、信号S1のデータ伝送
誤りを検出するための信号である。迂回信号情報S30
0は、本発明の特徴を示すものであり、呼接続要求信号
S1が迂回信号であるかどうかを表示するために加えた
情報(迂回情報)である。この迂回信号情報S100
は、1ビットからなり、「1」の場合は呼接続要求信号
S1が迂回信号であることを示し、「0」の場合は呼接
続要求信号S1が迂回信号でないことを示している。
The call connection request signal S1 in the mobile communication system of the present embodiment includes a signal identification number S100, call connection request information S200 and S400, detour signal information S300, and data check information S500. The signal identification information S100 located at the head of the call connection request signal S1 indicates the type of a call connection request such as an outgoing call request or an incoming call response. The call connection request information S200 and S400 are various information for a call connection request. The data check information S500 located at the end of the signal S1 is a signal for detecting a data transmission error of the signal S1. Detour signal information S30
0 indicates a feature of the present invention, and is information (detour information) added to indicate whether the call connection request signal S1 is a detour signal. This detour signal information S100
Consists of 1 bit. When "1", it indicates that the call connection request signal S1 is a bypass signal, and when "0", it indicates that the call connection request signal S1 is not a bypass signal.

【0020】図3は本実施例の無線基地局における呼接
続制御動作を示すフローチャートである。
FIG. 3 is a flowchart showing a call connection control operation in the radio base station according to the present embodiment.

【0021】さて、図1ないし図3を参照して本発明の
一実施例の移動体通信システムにおけるオーバーリーチ
防止制御と迂回呼接続制御とを説明する。
Now, the overreach prevention control and the alternate call connection control in the mobile communication system according to one embodiment of the present invention will be described with reference to FIGS.

【0022】サービスエリア41内に存在する移動体電
話端末7が発呼動作を行う場合には、移動体電話端末7
は迂回情報S300が「0」(迂回信号ではない表示)
の呼接続要求信号S1を上り制御チャネルを介して無線
基地局4に送信する。無線基地局4は呼接続要求信号S
1を受信しながら、上記上り制御チャネルの信号受信電
界レベルを測定する。無線基地局4は、呼接続要求信号
S1の受信を完了すると(ステップ11)、移動体電話
端末7から受信した呼接続要求信号S1中の迂回情報S
300が迂回信号であるか否かを判定する(ステップ1
2)。迂回情報S300は「0」を表示しているため、
この呼接続要求信号S1は迂回信号でない(ステップ1
2のNo)。そこで、無線基地局4は、上り制御チャネ
ルのオーバーリーチ防止制御のために、信号受信レベル
の測定値と電界レベルしきい値とを比較する(ステップ
13)。移動体電話端末7がサービスエリア41内に存
在するため、上記測定値は電界レベルしきい値以上であ
り(ステップ13のYes)、無線基地局4は受信した
呼接続要求信号S1を移動体電話交換局1に中継送信す
る。なお、移動体電話端末7がサービスエリア41の領
域外にいるときには、上記測定値は電界レベルしきい値
未満となり(ステップ13のNo)、無線基地局4は受
信した呼接続要求信号S1を破棄する(ステップ1
5)。
When the mobile telephone terminal 7 existing in the service area 41 performs a calling operation, the mobile telephone terminal 7
Indicates that the detour information S300 is "0" (not a detour signal)
Is transmitted to the radio base station 4 via the uplink control channel. The radio base station 4 transmits the call connection request signal S
While receiving 1, the signal reception electric field level of the uplink control channel is measured. When the wireless base station 4 completes the reception of the call connection request signal S1 (step 11), the detour information S in the call connection request signal S1 received from the mobile telephone terminal 7 is received.
It is determined whether or not 300 is a bypass signal (step 1).
2). Since the detour information S300 displays "0",
This call connection request signal S1 is not a bypass signal (step 1).
No. 2). Therefore, the radio base station 4 compares the measured value of the signal reception level with the electric field level threshold value for the control of preventing the reach of the uplink control channel (step 13). Since the mobile telephone terminal 7 is within the service area 41, the measured value is equal to or higher than the electric field level threshold (Yes in step 13), and the radio base station 4 transmits the received call connection request signal S1 to the mobile telephone. Relay transmission to the exchange 1 is performed. When the mobile telephone terminal 7 is out of the service area 41, the measured value is less than the electric field level threshold (No in step 13), and the radio base station 4 discards the received call connection request signal S1. (Step 1
5).

【0023】移動体電話交換局1では、呼接続要求信号
S1を受信した無線基地局4の通話チャネルがすべて使
用中のため、移動体電話端末7に対して通話チャネルの
割当てではなく、近隣無線基地局である無線基地局3へ
の呼接続要求送信の迂回指示信号を無線基地局4の下り
制御チャネルを介して送信する。
In the mobile telephone exchange 1, since all the communication channels of the radio base station 4 receiving the call connection request signal S1 are in use, the mobile communication terminal 7 does not allocate the communication channel, A detour instruction signal for transmitting a call connection request to the wireless base station 3 as a base station is transmitted via the downlink control channel of the wireless base station 4.

【0024】呼接続要求信号S1の迂回送信を指示され
た移動体電話端末7は、無線基地局3の下り制御チャネ
ルに同調した後、呼接続要求信号S1中の迂回情報S3
00を「1」(迂回信号である表示)にして、無線基地
局3の上り制御チャネルに呼接続要求信号S1を送信す
る。
The mobile telephone terminal 7 instructed to carry out the detour transmission of the call connection request signal S1 tunes to the downlink control channel of the radio base station 3, and then makes the detour information S3 in the call connection request signal S1.
00 is set to “1” (indicating a detour signal), and the call connection request signal S1 is transmitted to the uplink control channel of the wireless base station 3.

【0025】ここで、図3のフローチャートは、再びス
テップ11に戻ることになる。なおこれ以降の無線基地
局の動作は、無線基地局4ではなく、無線基地局3の動
作となる。
Here, the flowchart of FIG. 3 returns to step 11 again. The operation of the radio base station thereafter is not the radio base station 4 but the operation of the radio base station 3.

【0026】無線基地局3は、呼接続要求信号S1の受
信を行いながら、信号受信レベルの測定を実施する。無
線基地局3は、呼接続要求信号S1の受信が完了すると
(ステップ11)、移動体電話端末7から受信した呼接
続要求信号S1中の迂回情報S300が迂回信号である
か否かを判定する(ステップ12)。迂回情報S300
は「1」を表示しているため、この呼接続要求信号S1
は迂回信号である(ステップ12のYes)。従って、
無線基地局3は、信号受信レベルの測定値と電界レベル
しきい値との比較を行わず、呼接続要求信号S1を無条
件で移動体電話交換局1に中継送信する。
The radio base station 3 measures the signal reception level while receiving the call connection request signal S1. When the reception of the call connection request signal S1 is completed (step 11), the radio base station 3 determines whether or not the detour information S300 in the call connection request signal S1 received from the mobile telephone terminal 7 is a detour signal. (Step 12). Detour information S300
Displays "1", the call connection request signal S1
Is a bypass signal (Yes in step 12). Therefore,
The wireless base station 3 relays the call connection request signal S1 to the mobile telephone exchange 1 unconditionally without comparing the measured value of the signal reception level with the electric field level threshold.

【0027】呼接続要求信号S1を受けた移動体電話交
換局1は、呼接続要求信号S1を送信した無線基地局3
の保有する未使用通話チャネルの中から一つの通話チャ
ネルを選択し、これを移動体電話端末7の通話に割り当
てる。通話チャネルの割当て指示信号は、無線基地局3
の下り制御チャネルを介して移動体電話交換局1から移
動体電話端末7に送信される。
The mobile telephone exchange 1 which has received the call connection request signal S1 transmits the call connection request signal S1 to the radio base station 3.
One of the unused communication channels held by the mobile telephone terminal 7 is selected and assigned to the communication of the mobile telephone terminal 7. The communication channel assignment instruction signal is transmitted to the radio base station 3
Is transmitted from the mobile telephone exchange 1 to the mobile telephone terminal 7 through the downlink control channel.

【0028】以上説明したとおり、本実施例の移動体通
信システムは、信号受信レベルが電界レベルしきい値よ
り低くても、迂回先の無線基地局による呼接続要求信号
の破棄を生じさせる事なく、迂回対象の移動体電話端末
に通話サービスを高い確率で提供する事ができる。
As described above, in the mobile communication system of the present embodiment, even if the signal reception level is lower than the electric field level threshold value, the call connection request signal is not discarded by the detour destination radio base station. In addition, a call service can be provided to a mobile telephone terminal to be bypassed with a high probability.

【0029】[0029]

【発明の効果】以上説明したように本発明は、自局のサ
ービスエリアの外側に位置する移動体端末からの呼接続
要求信号を受けた無線基地局が、上記呼接続要求信号が
迂回信号であるときには、信号受信レベルの値に関係な
く上記呼接続要求信号を有効信号として扱うので、上り
制御チャネルのオーバーリーチ防止を図りながら確実に
無線基地局迂回呼の接続を行う事ができ、従来の一律に
信号受信レベルと電界レベルしきい値との比較を行った
後に呼接続を行う迂回呼接続制御方式より、呼接続の成
功率を向上させる効果がある。
As described above, according to the present invention, a radio base station which has received a call connection request signal from a mobile terminal located outside the service area of its own station, is capable of transmitting the call connection request signal with a bypass signal. In some cases, the call connection request signal is treated as a valid signal regardless of the value of the signal reception level, so that it is possible to reliably connect the radio base station bypass call while preventing overreach of the uplink control channel. Compared to the alternate call connection control method in which the signal connection level is uniformly compared with the signal reception level and then the call connection is performed, there is an effect of improving the success rate of the call connection.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の対照とする移動体通信システムのシス
テム構成図である。
FIG. 1 is a system configuration diagram of a mobile communication system as a control of the present invention.

【図2】本発明の一実施例で使用される呼接続要求信号
のデータストリームを示す図である。
FIG. 2 is a diagram showing a data stream of a call connection request signal used in one embodiment of the present invention.

【図3】本実施例の無線基地局における上り制御チャネ
ルの呼接続制御動作を示すフローチャートである。
FIG. 3 is a flowchart illustrating a call connection control operation of an uplink control channel in the wireless base station of the embodiment.

【符号の説明】[Explanation of symbols]

1 移動体電話交換局 2〜5 無線基地局 6,7 移動体電話端末 10 制御信号線および通話線の集合線 21,31,41,51 サービスエリア DESCRIPTION OF SYMBOLS 1 Mobile telephone exchange office 2-5 Radio base station 6,7 Mobile telephone terminal 10 Collective line of control signal line and communication line 21,31,41,51 Service area

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 複数のサービスエリアを移動可能な複数
の移動体電話端末と、前記サービスエリアごとに配置さ
れ前記移動体電話端末のいずれかから上り制御チャネル
を介して受けた呼接続要求信号のオーバーリーチ防止制
御を行う無線基地局と、集合線で前記無線基地局に接続
され前記呼接続要求信号を受信した前記無線基地局に空
きの通話チャネルが存在しない場合には前記呼接続要求
信号送信の前記移動体電話端末に対する呼接続要求の迂
回指示を前記無線基地局の下り制御チャネルを介して行
う移動体電話交換局とを含む移動体通信システムの迂回
呼接続制御方式において、 前記移動体電話端末が、前記移動体電話交換局の迂回指
示に基づいて前記呼接続要求信号を送信する場合には、
迂回信号の表示をした前記呼接続要求信号を送信し、 前記無線基地局が、受信した前記呼接続要求信号が前記
迂回信号の表示がある場合には、前記呼接続要求信号を
この信号の信号受信レベルに関係なく有効信号として前
記移動体電話交換局に中継送信することを特徴とする移
動体通信システムの迂回呼接続制御方式。
1. A plurality of mobile telephone terminals capable of moving in a plurality of service areas, and a call connection request signal received via one of the mobile telephone terminals, which is arranged for each of the service areas and received via an uplink control channel. Transmitting a call connection request signal when there is no free communication channel in the radio base station that performs overreach prevention control and the radio base station that is connected to the radio base station via a collective line and receives the call connection request signal; A mobile telephone switching center for performing a bypass instruction of a call connection request to the mobile telephone terminal via a downlink control channel of the radio base station. When the terminal transmits the call connection request signal based on a detour instruction of the mobile telephone exchange,
Transmitting the call connection request signal indicating the detour signal, the radio base station, if the received call connection request signal indicates the detour signal, the call connection request signal is a signal of this signal A round-trip call connection control method for a mobile communication system, wherein a relay signal is transmitted to the mobile telephone exchange as a valid signal regardless of a reception level.
【請求項2】 前記無線基地局が、受信した前記呼接続
要求信号に迂回信号の表示があるかどうかを判定する迂
回信号判定手段と、前記呼接続要求信号に前記迂回信号
の表示がある場合には、前記呼接続要求信号を有効信号
として前記移動体電話交換局に中継送信する迂回呼送信
手段とを含むことを特徴とする請求項1記載の移動体通
信システムの迂回呼接続制御方式。
2. The method according to claim 1, wherein the wireless base station determines whether the received call connection request signal includes a bypass signal, and the call connection request signal includes the bypass signal. 2. The alternate call connection control method for a mobile communication system according to claim 1, further comprising: alternate call transmitting means for relaying the call connection request signal as an effective signal to the mobile switching center.
【請求項3】 前記無線基地局が、受信した前記呼接続
要求信号に前記迂回信号の表示がない場合には、前記呼
接続要求信号の信号受信レベルの測定値を予め定めた電
界レベルしきい値と比較する信号受信レベル比較手段を
さらに有し、 前記迂回呼送信手段が、前記信号受信レベルの測定値が
前記電界レベルしきい値以上であるときには、前記呼接
続要求信号を有効信号として前記移動体電話交換局に中
継送信し、前記信号受信レベルの測定値が前記電界レベ
ルしきい値未満であるときには、前記呼接続要求信号を
破棄する手段をさらに有することを特徴とする請求項2
記載の移動体通信システムの迂回呼接続制御方式。
3. The radio base station, when the received call connection request signal does not include the indication of the bypass signal, measures a signal reception level of the call connection request signal to a predetermined electric field level threshold. Further comprising a signal reception level comparing means for comparing the call connection request signal as a valid signal when the measured value of the signal reception level is equal to or more than the electric field level threshold value. 3. The apparatus according to claim 2, further comprising: means for relaying the call connection request signal to a mobile telephone exchange when the measured value of the signal reception level is less than the electric field level threshold value.
A bypass call connection control method for a mobile communication system as described in the above.
JP5263969A 1993-10-22 1993-10-22 Alternate call connection control method for mobile communication systems Expired - Fee Related JP2731708B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5263969A JP2731708B2 (en) 1993-10-22 1993-10-22 Alternate call connection control method for mobile communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5263969A JP2731708B2 (en) 1993-10-22 1993-10-22 Alternate call connection control method for mobile communication systems

Publications (2)

Publication Number Publication Date
JPH07123460A JPH07123460A (en) 1995-05-12
JP2731708B2 true JP2731708B2 (en) 1998-03-25

Family

ID=17396741

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5263969A Expired - Fee Related JP2731708B2 (en) 1993-10-22 1993-10-22 Alternate call connection control method for mobile communication systems

Country Status (1)

Country Link
JP (1) JP2731708B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008072669A (en) * 2006-09-15 2008-03-27 Fujitsu Ltd Base station device used in radio communication system
JP5239677B2 (en) 2008-09-18 2013-07-17 富士通株式会社 COMMUNICATION DEVICE, BASE STATION DEVICE, AND COMMUNICATION METHOD
JP5295866B2 (en) * 2009-05-27 2013-09-18 京セラ株式会社 Base station apparatus and channel allocation method
JP2010288153A (en) * 2009-06-12 2010-12-24 Denso Corp Vehicle-mounted unit

Also Published As

Publication number Publication date
JPH07123460A (en) 1995-05-12

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