JPH0568282A - Automobile telephone exchange system - Google Patents

Abstract

PURPOSE:To secure the automobile telephone exchange by selecting a same frequency to the carrier frequencies of a radio base station having adjacent and duplicate service areas on the occurrence of a fault of an inter-station relay line in a public telephone network. CONSTITUTION:When a subscriber(SUB) 100 of an exchange station(EX) 11 makes talking with a mobile body terminal subscriber(MSS) 400 resident in a service area 40 via an inter-station relay line(TRK) 12, the EX10, an automobile telephone exchange(MSW) 2 and a radio base station (MBS) 4 and a fault (marked X) takes place in the TRK 12, line fault monitor sections(SUP) 20, 30 detect the fault via the EX10, 11 respectively. Then frequency changeover sections(FSW) 21, 31 select the carrier frequencies of transmission reception radio waves of the MBS 4, 5 to a frequency fo. Thus, on the occurrence of a fault of the TRK 12 in the public telephone network(NW) 1, even when the traffic of a bypass in the NW1 is in congestion, the automobile telephone service is secured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は自動車電話交換方式に関
し、特に自動車電話交換機と接続される公衆電話網内の
局間中継線障害時に迂回路により通信を確保する無線系
迂回機能付きの自動車電話交換方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile telephone exchange system, and more particularly, to an automobile telephone with a wireless detour function for ensuring communication by a detour when an interoffice relay line failure in a public telephone network connected to the automobile telephone switch. Regarding the exchange method.

【０００２】[0002]

【従来の技術】従来、この種の自動車電話交換方式で
は、公衆電話網内の局間中継線障害時には公衆電話網内
で迂回路を設定していた。2. Description of the Related Art Conventionally, in this type of automobile telephone exchange system, a detour is set in the public telephone network when an interoffice trunk line failure in the public telephone network occurs.

【０００３】[0003]

【発明が解決しようとする課題】上述した従来の自動車
電話交換方式では、公衆電話網内の局間中継線に障害が
発生した時には公衆電話網内で迂回路を設定していたの
で、迂回路のトラヒックが増加すると、自動車電話交換
機との接続ができず自動車電話サービスを確保できなく
なるという欠点がある。In the conventional car telephone exchange system described above, a detour is set in the public telephone network when a failure occurs in the interoffice relay line in the public telephone network. However, if the traffic of the car is increased, the car phone service cannot be secured because the car phone exchange cannot be connected.

【０００４】[0004]

【課題を解決するための手段】本発明の自動車電話交換
方式は、互いに隣接し且つサービスエリアに重複エリア
を有する第１，第２の無線基地局と、前記第１，第２の
無線基地局とそれぞれ接続される第１，第２の自動車電
話交換機と、前記第１，第２の自動車電話交換機間の呼
を接続する公衆電話網とからなり、前記第１，第２の自
動車電話交換機は前記公衆電話網内の局間中継線障害時
に前記第１，第２の無線基地局の送受信電波の搬送周波
数を同一周波数に切り替える切替手段を備えている。According to the vehicle telephone exchange system of the present invention, first and second radio base stations which are adjacent to each other and have an overlapping area in a service area, and the first and second radio base stations. And a public telephone network for connecting a call between the first and second automobile telephone exchanges, wherein the first and second automobile telephone exchanges are Switching means is provided for switching the carrier frequencies of the transmitted and received radio waves of the first and second radio base stations to the same frequency when an inter-station relay line failure in the public telephone network occurs.

【０００５】[0005]

【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の自動車電話交換方式の一実施例を示
すブロック図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a car telephone exchange system of the present invention.

【０００６】本実施例のシステムは公衆電話網（以下Ｎ
Ｗ）１と、ＮＷ１と接続された自動車電話交換機（以下
ＭＳＷ）２，３と、ＭＳＷ２，３とそれぞれ接続された
無線基地局（以下ＭＢＳ）４，５とからなる。ＮＷ１は
局間中継線（以下ＴＲＫ）１２で接続された交換局（以
下ＥＸ）１０，１１を備え、ＭＳＷ２はＥＸ１０を介し
てＴＲＫ１２の障害を監視する回線障害監視部（以下Ｓ
ＵＰ）２０と、ＴＲＫ１２の障害時にＭＢＳ４に指示し
て送受信電波の搬送波周波数を所定の周波数ｆ０に切り
替えさせる周波数切替部（以下ＦＳＷ）２１とを備え、
ＭＳＷ３は同様にＳＵＰ３０とＦＳＷ３１とを備えてい
る。そしてＭＢＳ４のサービスエリア４０とＭＢＳ５の
サービスエリア５０は隣接しており、しかも重複エリア
６０が存在する。The system of this embodiment is a public telephone network (hereinafter referred to as N
W) 1, an automobile telephone exchange (hereinafter MSW) 2 and 3 connected to NW 1, and wireless base stations (hereinafter MBS) 4 and 5 connected to MSWs 2 and 3, respectively. The NW 1 includes exchanges (hereinafter, EX) 10 and 11 connected by an interoffice relay line (hereinafter, TRK) 12, and the MSW 2 has a line failure monitoring unit (hereinafter, S) that monitors a failure of the TRK 12 via the EX 10.
UP) 20 and a frequency switching unit (hereinafter referred to as FSW) 21 for instructing the MBS 4 to switch the carrier frequency of the transmitted / received radio wave to a predetermined frequency f0 when the TRK 12 fails,
The MSW 3 similarly includes the SUP 30 and the FSW 31. The service area 40 of MBS4 and the service area 50 of MBS5 are adjacent to each other, and an overlapping area 60 exists.

【０００７】続いて本実施例の動作について説明する。
例えばＥＸ１１の加入者（以下ＳＵＢ）１００がＴＲＫ
１２，ＥＸ１０，ＭＳＷ２，ＭＢＳ４を介してサービス
エリア４０内にいる移動体端末加入者（以下ＭＳＳ）４
００と通話しているときＴＲＫ１２に障害（×印で図
示）が発生すると、ＳＵＰ２０，３０はそれぞれＥＸ１
０，１１を介してこの障害を検知し、ＦＳＷ２１，３１
によりＭＢＳ４，５の送受信電波の搬送波周波数を周波
数ｆ０に切り替えさせる。このようにすると、ＥＸ１１
のＳＵＢ１００はＥＸ１１，ＭＳＷ３，ＭＢＳ５，周波
数ｆ０のチャネル，ＭＢＳ４を介してＭＳＳ４００との
通信を確保することができる。Next, the operation of this embodiment will be described.
For example, a subscriber (hereinafter referred to as SUB) 100 of EX11 is TRK
Mobile terminal subscriber (hereinafter referred to as MSS) 4 within service area 40 via 12, EX10, MSW2, MBS4
If a trouble occurs in TRK12 (shown with a cross mark) while talking to 00, SUP20 and 30 are respectively set to EX1.
This fault is detected via 0, 11 and FSW 21, 31
The carrier frequency of the transmitted / received radio waves of the MBSs 4 and 5 is switched to the frequency f0 by. This way, EX11
The SUB 100 can secure communication with the MSS 400 via the EX 11, MSW 3, MBS 5, channel of frequency f0, and MBS 4.

【０００８】[0008]

【発明の効果】以上説明したように本発明は隣接し且つ
重複するサービスエリアを持つ無線基地局の搬送波周波
数を公衆電話網内の局間中継線の障害時に同一周波数に
切り替えるようにしたので、このような状態でも自動車
電話サービスを確保できるという効果を有する。As described above, according to the present invention, the carrier frequencies of adjacent radio base stations having overlapping service areas are switched to the same frequency when a relay line between stations in the public telephone network fails. Even in such a state, there is an effect that the car telephone service can be secured.

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

【図１】本発明の自動車電話交換方式の一実施例を示す
ブロック図である。FIG. 1 is a block diagram showing an embodiment of a car telephone exchange system of the present invention.

【符号の説明】[Explanation of symbols]

１ 公衆電話網（ＮＷ） ２，３ 自動車電話交換機（ＭＳＷ） ４，５ 無線基地局（ＭＢＳ） １０，１１ 交換局（ＥＸ） １２ 局間中継線（ＴＲＫ） ２０，３０ 回線障害監視部（ＳＵＰ） ２１，３１ 周波数切替部（ＦＳＷ） ４０，５０ サービスエリア ６０ 重複エリア １００ 移動体端末加入者（ＭＳＳ） 1 Public telephone network (NW) 2, 3 Car telephone exchange (MSW) 4,5 Radio base station (MBS) 10, 11 Exchange (EX) 12 Inter-office trunk line (TRK) 20, 30 Line fault monitoring unit (SUP) ) 21,31 Frequency switching unit (FSW) 40,50 Service area 60 Overlap area 100 Mobile terminal subscriber (MSS)

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 互いに隣接し且つサービスエリアに重複
エリアを有する第１，第２の無線基地局と、前記第１，
第２の無線基地局とそれぞれ接続される第１，第２の自
動車電話交換機と、前記第１，第２の自動車電話交換機
間の呼を接続する公衆電話網とからなり、前記第１，第
２の自動車電話交換機は前記公衆電話網内の局間中継線
障害時に前記第１，第２の無線基地局の送受信電波の搬
送周波数を同一周波数に切り替える切替手段を備えるこ
とを特徴とする自動車電話交換方式。1. A first and a second radio base station which are adjacent to each other and have an overlapping area in a service area, and the first and second radio base stations.
The first and second automobile telephone exchanges are respectively connected to a second radio base station, and a public telephone network for connecting a call between the first and second automobile telephone exchanges. The second mobile telephone switchboard is equipped with a switching means for switching the carrier frequencies of the radio waves transmitted and received by the first and second radio base stations to the same frequency when the interoffice relay line failure in the public telephone network occurs. Exchange method.