JP2604767B2 - Mobile communication system - Google Patents

Mobile communication system

Info

Publication number
JP2604767B2
JP2604767B2 JP62310377A JP31037787A JP2604767B2 JP 2604767 B2 JP2604767 B2 JP 2604767B2 JP 62310377 A JP62310377 A JP 62310377A JP 31037787 A JP31037787 A JP 31037787A JP 2604767 B2 JP2604767 B2 JP 2604767B2
Authority
JP
Japan
Prior art keywords
wireless
signal
wireless connection
rtel
communication system
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
JP62310377A
Other languages
Japanese (ja)
Other versions
JPH01149623A (en
Inventor
敏洋 原
嘉利 村田
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 NEC Corp, Nippon Telegraph and Telephone Corp filed Critical NEC Corp
Priority to JP62310377A priority Critical patent/JP2604767B2/en
Publication of JPH01149623A publication Critical patent/JPH01149623A/en
Application granted granted Critical
Publication of JP2604767B2 publication Critical patent/JP2604767B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

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  • Mobile Radio Communication Systems (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、移動通信方式に関し、特に複数のゾーンに
よるコードレス電話の移動通信方式に関する。
The present invention relates to a mobile communication system, and more particularly, to a mobile communication system of a cordless telephone using a plurality of zones.

(従来の技術) 従来、この種の移動通信方式は、事業所の様な広い地
域(サービスエリア)で、多数の無線電話機(以下RTEL
という)をそれぞれ構内電話機の一つとして使用できる
様にした方式で、電話線を無線接続装置(以下CEとい
う)を介して可搬型のRTELに無線接続し、サービスエリ
ア内の各CEの範囲内で場所の制約なく通話ができる様に
したものである。
(Prior art) Conventionally, this type of mobile communication system has been used in a large area (service area) such as a business office, and a large number of wireless telephones (hereinafter referred to as RTEL).
) Can be used as one of the local telephones, and the telephone line is wirelessly connected to a portable RTEL via a wireless connection device (hereinafter referred to as CE), within the range of each CE in the service area. In this way, calls can be made without restriction on the location.

この移動通信方式では、サービスエリア内に複数のCE
をゾーンごとに分散設置し、各CEをそれぞれのRTELが共
用できる様にしている。複数のCEを統合して一つの構内
交換機(以下PBXという)に接続するために一つの無線
回線制御装置(以下RCUという)が設けてある。RCUは各
CEに接続線でそれぞれ接続され、回線交換CEの管理、RT
ELの位置管理を行なっている。RTELは、位置登録信号を
最も高いレベルで受信したCEのグループに属する様に、
RCUにより制御される。RCUは、各RTELがどのグループの
CEの周辺の範囲(ゾーン)内にいるかの位置情報を記憶
しており、あるRTELの発呼または着呼の際、そのRTELが
現在いるゾーンのCEをPBXのそのRTELに対応する内線端
子に接続する。CE,RTEL間の制御情報は、一つの制御チ
ャネルで各RTEL〜CE間で無線伝送される。
In this mobile communication system, multiple CEs are provided in a service area.
Are distributed in each zone, and each CE can be shared by each RTEL. In order to integrate a plurality of CEs and connect them to one private branch exchange (hereinafter, referred to as PBX), one radio line controller (hereinafter, referred to as RCU) is provided. RCU is
Connected to the CE via connection lines, respectively, manages circuit-switched CE, RT
EL location management. RTEL, as belonging to the group of CE that received the location registration signal at the highest level,
Controlled by the RCU. The RCU determines which group each RTEL
It stores the location information of whether it is within the range (zone) around the CE, and when calling or receiving a certain RTEL, the CE of the zone where the RTEL is currently located is connected to the extension terminal corresponding to the RTEL of the PBX. Connecting. Control information between CE and RTEL is wirelessly transmitted between each RTEL and CE on one control channel.

通話信号を各RTEL〜CE間で無線伝送する通話チャネル
は複数あり、電波使用効率を上げるために各RTEL,CEで
それらの通話チャネルを共用する。CEは、通話空きチャ
ネルを検索して記憶しており、通話接続時には、使用す
る通話チャネルを制御チャネルを介してRTELに指定す
る。
There are a plurality of communication channels for wirelessly transmitting a communication signal between each RTEL and CE, and these RTELs and CEs share these communication channels in order to improve radio wave use efficiency. The CE searches for and stores an available call channel, and when a call is connected, specifies a call channel to be used as an RTEL via a control channel.

また、RCUはCE〜RTEL間の着呼接続時間の短縮、制御
チャネルの占有時間の短縮をするために、各CEに同期信
号を一定時間ずらして出力する。CEは、第3図に示すよ
うに、RCUからの同期信号を受信すると制御チャネルの
送信をONにして、RTELに対して位置情報とバッテリー・
セイビング(以下BSという)の情報を含んだ報知信号を
T2時間連続に出力し、報知信号送出の期間T2には発着呼
を禁止にする。CEは、この報知信号の最終フレームの最
終ビットを送出後、SB周期管理タイマーをリセットし、
その後送信をOFFにして制御チャネルで待ち受け状態に
なる。RTELは、受信電界が設定値以上であればBSを停止
して、信号を受信する。受信された信号が報知信号でか
つCEG−ID(以下無線接続装置グループ識別という)が
記憶していたものと一致していた場合は受信を続け受信
報知信号の最終フレームの最終ビットを受信した後にBS
周期管理タイマーをリセットし、CEのBS周期管理タイマ
ーとの周期をあわせる。
In addition, the RCU outputs a synchronization signal to each CE with a certain time delay in order to reduce the incoming connection time between the CE and the RTEL and to reduce the occupation time of the control channel. When the CE receives the synchronization signal from the RCU, the CE turns on the control channel transmission as shown in FIG.
Broadcasting signal containing saving (hereinafter referred to as BS) information
The signal is output continuously for T2 times, and outgoing / incoming calls are prohibited during the period T2 of the notification signal transmission. After transmitting the last bit of the last frame of the broadcast signal, the CE resets the SB cycle management timer,
After that, the transmission is turned off and a standby state is established on the control channel. If the received electric field is equal to or larger than the set value, the RTEL stops the BS and receives a signal. If the received signal is a broadcast signal and the CEG-ID (hereinafter referred to as wireless connection device group identification) matches the stored one, the reception is continued and after receiving the last bit of the last frame of the received broadcast signal BS
Reset the cycle management timer and match the cycle with the CE's BS cycle management timer.

このように、CEが報知信号を送信し、RTELがその報知信
号を受信して上述の作動を行うのは、他グループから移
動してきたRTEL(同期は、外れている。)へのCEG−ID
の報知とCE〜RTEL間のBS同期の確立、グループ外に出た
ことの検出、移動先グループの判定、グループ内におい
てBS同期が確定しているRTELに対して、RTEL〜CE間のBS
周期誤差修正を行なうためである。BS同期を合わせるこ
とにより、RTELがいつ受信状態かがCEでわかるので、CE
はRTELの受信タイミングに合わせて着呼信号を出力で
き、着呼接続時間の短縮、制御チャネルの占有時間を短
縮することができる。
In this way, the reason that the CE transmits the notification signal and the RTEL receives the notification signal and performs the above-described operation is that the CEG-ID to the RTEL (synchronization is lost) that has moved from another group.
Of BS and establishment of BS synchronization between CE and RTEL, detection of leaving the group, determination of destination group, and BS between RTEL and CE
This is to correct the cyclic error. By adjusting the BS synchronization, the CE can tell when the RTEL is in the receiving state.
Can output an incoming call signal in accordance with the RTEL reception timing, and can shorten the incoming call connection time and the occupation time of the control channel.

RTELは一度以上報知信号を受信出来なかった場合、グ
ループ外に出たと判定し、報知信号の受信が開始された
後に、一番最初の一定レベル以上で受信された報知信号
を移行グループとする。
If the RTEL has failed to receive the notification signal more than once, it determines that it has gone out of the group, and after the reception of the notification signal starts, sets the notification signal received at the first predetermined level or higher as the transition group.

(発明が解決しようとする問題点) 上述した従来の移動通信方式は、RCUから送られる同
期信号を各々のCEが受信し、CEは同期信号を受信すると
RTELに対し報知信号を出力してCE〜RTEL間のバッテリー
・セイビング同期を確立させている。CEは、RCUからの
同期信号以外にも着呼信号や制御信号も受信するほかRT
ELからの発呼信号もいつでも受信出来る様になっている
から、RCUからの同期信号がCEに来る前に発呼処理を行
なってしまうとRTELに報知信号を送出するタイミングが
ずれてしまい、RTELは、一度以上報知信号を受信できな
い場合、圏外になってしまう欠点があった。
(Problems to be Solved by the Invention) In the conventional mobile communication system described above, each CE receives a synchronization signal sent from the RCU, and the CE receives the synchronization signal.
A notification signal is output to RTEL to establish battery saving synchronization between CE and RTEL. CE receives incoming signals and control signals in addition to synchronization signals from RCU,
Since the call signal from EL can be received at any time, if the call process is performed before the synchronization signal from RCU arrives at CE, the timing of sending the notification signal to RTEL will be shifted, Has a drawback in that if it cannot receive the notification signal more than once, it goes out of service.

そこで、本発明の目的は、前記従来の移動通信方式の
欠点を解決し、RCUからの同期信号がCEに来る前にRTEL
から発呼をかけられても、タイミング良くCEからRTELに
報知信号を送出できる移動通信方式を提供することにあ
る。
Therefore, an object of the present invention is to solve the drawbacks of the above-mentioned conventional mobile communication system, and to set the RTEL before the synchronization signal from the RCU comes to the CE.
An object of the present invention is to provide a mobile communication system capable of transmitting a notification signal from the CE to the RTEL in a timely manner even if a call is made from the mobile terminal.

(問題点を解決するための手段) 前述の問題点を解決するために本発明が提供する手段
は、複数の無線電話機と、サービスエリア内に分散設置
されてゾーンを作り、このゾーン内にいる前記無線電話
機に無線接続される複数の無線接続装置と、前記無線接
続装置と交換機との接続をする無線回線制御装置とを有
し、前記無線回線制御装置は一定時間ごとに同期信号を
前記無線接続装置に送出し、前記無線接続装置は前記同
期信号を受信すると前記無線電話機に報知信号を送出
し、前記無線電話器は前記報知信号を受信することによ
り前記無線接続装置と当該無線電話機のバッテリーセイ
ビング同期管理を行なう移動通信方式であって、前記無
線接続装置は前記無線回線制御装置から前記同期信号を
受信する時間の前に隣接する所定時間をガードタイムと
し、このガードタイムには前記無線電話機の発着呼を禁
止し、前記無線接続装置は前記報知信号の最終フレーム
の最終ビットを送出した後にバッテリーセイビング周期
管理タイマーをリセットし、前記無線電話機は前記報知
信号の最終フレームの最終ビットの受信を終えた後にバ
ッテリーセイビング周期管理タイマーをリセットするこ
とを特徴とする。
(Means for Solving the Problems) In order to solve the above-mentioned problems, a means provided by the present invention is to provide a plurality of wireless telephones and a zone which is distributed and installed in a service area, and is in the zone. A plurality of wireless connection devices wirelessly connected to the wireless telephone, and a wireless line control device for connecting the wireless connection device and an exchange, wherein the wireless line control device transmits a synchronization signal to the wireless telephone every predetermined time. The wireless connection device sends a notification signal to the wireless telephone when receiving the synchronization signal, and the wireless telephone receives the notification signal to send the wireless connection device and the battery of the wireless telephone. In a mobile communication system for performing saving synchronization management, the wireless connection device garners an adjacent predetermined time before receiving the synchronization signal from the wireless channel control device. The guard time prohibits outgoing / incoming calls of the wireless telephone, the wireless connection device resets a battery saving period management timer after transmitting the last bit of the last frame of the notification signal, and the wireless telephone The battery saving period management timer is reset after receiving the last bit of the last frame of the broadcast signal.

(実施例) 以下に実施例の図面を参照して本発明について詳しく
説明する。
(Examples) Hereinafter, the present invention will be described in detail with reference to the drawings of the examples.

第1図は、本発明の移動通信方式の一実施例を示すブ
ロック図である。また、第2図は第1図実施例における
RCU,CE,RTEL間の周期信号、報知信号、BS周期管理タイ
マーの動作を示すタイムチャート図である。
FIG. 1 is a block diagram showing one embodiment of the mobile communication system of the present invention. FIG. 2 is a sectional view of the embodiment of FIG.
FIG. 4 is a time chart illustrating operations of a period signal, a notification signal, and a BS period management timer between RCU, CE, and RTEL.

第1図の実施例はRTEL1,CE2,RCU3,PBX4,接続線L1、内
線L2、加入者線L3、ゾーンZで構成されている。更に詳
しく述べると、この実施例は、複数のRTEL1とサービス
エリア内に散在設置された複数のCE2と、それぞれのCE2
に1対1に対応する接続線L1でCE2と接続されたRCU3
と、複数の内線L2でRCU3と接続されたPBX4とを備えて構
成されている。そして、この実施例では、事業所の様な
広い地域(サービスエリア)で、多数のRTEL1をそれぞ
れ構内電話機の一つとして使用できる。
The embodiment shown in FIG. 1 comprises RTEL1, CE2, RCU3, PBX4, connection line L1, extension line L2, subscriber line L3, and zone Z. More specifically, in this embodiment, a plurality of RTELs 1 and a plurality of CEs 2 scattered in a service area, and each CE 2
RCU3 connected to CE2 with connection line L1 corresponding to 1
And a PBX 4 connected to the RCU 3 via a plurality of extensions L2. In this embodiment, a large number of RTELs 1 can be used as one of private telephones in a wide area (service area) such as an office.

各CE2とPBX4との間に設けてあるRCU3は、CE2とはL1で
接続され、PBX4とはL2で接続され、回線交換、CEの管
理、RTELの位置管理を行なっている。そして、このRCU3
はCE2〜RTEL1間における着呼接続時間の短縮、制御チャ
ネルの占有時間の短縮をするために、一定周期で同期信
号をCE2に出力する。
RCU3 provided between each CE2 and PBX4 is connected to CE2 by L1, and connected to PBX4 by L2, and performs circuit switching, CE management, and RTEL location management. And this RCU3
Outputs a synchronization signal to CE2 at a constant period in order to reduce the incoming call connection time between CE2 and RTEL1 and the occupation time of the control channel.

上記構成の第1図の移動通信方式は次のように動作す
る。この実施例では、第2図のタイムチャート図で示す
ように、CE2はRCU3から同期信号を受信する前にガード
タイムT1を設けガードタイムT1にも発着呼を禁止し、同
期信号待ちとする。従って、発着呼禁止期間は、ガード
タイムT1+報知信号期間T2とする。CE2は同期信号を受
信すると制御チャネルからRTEL1に対して位置情報とバ
ッテリー・セイビングの情報を含んだ報知信号を、T2時
間繰り返し連続に出力する。CE2は、報知信号の最終フ
レームの最終ビットを送出した後に、BS周期管理タイマ
ーをリセットし、RTEL1も報知信号の最終フレームの最
終ビットを受信し終えた後にBS周期管理タイマーをリセ
ットして、CE2とRTEL1のBS周期を合わせる。この様に、
本発明ではガードタイムを設けているから、同期信号受
信時にRTEL1からの発呼信号を受けることはない。
The mobile communication system of FIG. 1 having the above configuration operates as follows. In this embodiment, as shown in the time chart of FIG. 2, the CE2 sets a guard time T1 before receiving a synchronization signal from the RCU 3, prohibits incoming and outgoing calls even at the guard time T1, and waits for a synchronization signal. Therefore, the call-inhibited / call-inhibited period is defined as guard time T1 + notification signal period T2. Upon receiving the synchronization signal, CE2 repeatedly outputs a notification signal including position information and battery saving information to RTEL1 from the control channel repeatedly for T2 times. CE2 resets the BS cycle management timer after sending the last bit of the last frame of the broadcast signal, and RTEL1 also resets the BS cycle management timer after finishing receiving the last bit of the last frame of the broadcast signal, CE2 And the BS cycle of RTEL1. Like this
Since a guard time is provided in the present invention, a call signal from RTEL1 is not received when a synchronization signal is received.

CE2は、同期信号が一定周期ごとに来ることが分かっ
ているので、一度だけ同期信号を受信すれば、次に同期
信号が来る時間がわかるのでガードタイムT1前から発着
呼を禁止し同期信号待ちに入ることが出来る。そのガー
ドタイムT1は、報知信号期間T2の前に隣接する時間であ
ってCE2が処理を行なっていても同期信号受信時刻に同
期信号受信処理に復帰できる長さの時間である。なお、
RCU3は、通話中のCE2に対しては同期信号を送らない。
Since CE2 knows that the synchronization signal comes at regular intervals, if the synchronization signal is received only once, it knows the next synchronization signal coming time. You can enter. The guard time T1 is a time adjacent before the broadcast signal period T2, and is a time that can return to the synchronous signal receiving process at the synchronous signal receiving time even when the CE2 is performing the process. In addition,
RCU3 does not send a synchronization signal to CE2 during a call.

(発明の効果) 以上に説明した通り本発明の移動通信方式では、報知
信号送出の前にガードタイムを設け、ガードタイム+報
知信号期間を発着呼禁止にすることにより発着呼シーケ
ンスによる、報知信号送出のタイミングずれを回避して
いる。そこで、本発明の移動通信方式においては、RCU
からの同期信号がCEに来る前にRTELから発呼をかけられ
ても、CEからRTELに報知信号をタイミングよく送出でき
る。
(Effects of the Invention) As described above, in the mobile communication system according to the present invention, a guard time is provided before the broadcast signal is transmitted, and the guard time + the broadcast signal period is prohibited from calling and receiving. The timing deviation of sending is avoided. Therefore, in the mobile communication system of the present invention, the RCU
Even if a call is issued from the RTEL before the synchronization signal from the CE arrives at the CE, the notification signal can be sent from the CE to the RTEL with good timing.

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

第1図は本発明の移動通信方式の一実施例を示すブロッ
ク図である。また、第2図および第3図は移動通信方式
におけるRCU,CE,RTEL間の同期信号、報知信号、BS周期
管理タイマーの動作を示すタイムチャート図であり、第
2図は第1図実施例に関し、第3図は従来の移動通信方
式に関する。 1…RTEL(無線電話機)、2…CE(無線接続装置)、3
…RCU(無線回線制御装置)、4…PBX(構内交換機)。
FIG. 1 is a block diagram showing one embodiment of the mobile communication system of the present invention. FIGS. 2 and 3 are time charts showing the operation of the synchronization signal between the RCU, CE, and RTEL, the broadcast signal, and the operation of the BS cycle management timer in the mobile communication system. FIG. 2 is an embodiment of FIG. FIG. 3 relates to a conventional mobile communication system. 1 ... RTEL (wireless telephone), 2 ... CE (wireless connection device), 3
... RCU (radio line controller), 4 ... PBX (private branch exchange).

───────────────────────────────────────────────────── フロントページの続き 審査官 望月 章俊 (56)参考文献 特開 昭60−52133(JP,A) D.C.Cox”Universal Portable Radio Co mmunications”,Pro c.IEEE Vol.75 No.4 PP.436−477 Apr.1987 ──────────────────────────────────────────────────続 き Continuation of the front page Examiner Akitoshi Mochizuki (56) References JP-A-60-52133 (JP, A) C. Cox "Universal Portable Radio Communications", Proc. IEEE Vol. 75 No. 4 PP. 436-477 Apr. 1987

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】複数の無線電話機と、サービスエリア内に
分散設置されてゾーンを作り、このゾーン内にいる前記
無線電話機に無線接続される複数の無線接続装置と、前
記無線接続装置と交換機との接続をする無線回線制御装
置とを有し、前記無線回線制御装置は一定時間ごとに同
期信号を前記無線接続装置に送出し、前記無線接続装置
は前記同期信号を受信すると前記無線電話機に報知信号
を送出し、前記無線電話機は前記報知信号を受信するこ
とにより前記無線接続装置と当該無線電話機のバッテリ
ーセイビング同期管理を行なう移動通信方式において、
前記無線接続装置は前記無線回線制御装置から前記同期
信号を受信する時間の前に隣接する所定時間をガードタ
イムとし、このガードタイムには前記無線電話機の発着
呼を禁止し、前記無線接続装置は前記報知信号の最終フ
レームの最終ビットを送出した後にバッテリーセイビン
グ周期管理タイマーをリセットし、前記無線電話機は前
記報知信号の最終フレームの最終ビットの受信を終えた
後にバッテリーセイビング周期管理タイマーをリセット
することを特徴とする移動通信方式。
1. A plurality of wireless telephones, a plurality of wireless connection devices distributed in a service area to form a zone, a plurality of wireless connection devices wirelessly connected to the wireless telephones in the zone, and the wireless connection device and an exchange. A wireless channel control device for connecting the wireless communication device, wherein the wireless channel control device sends out a synchronization signal to the wireless connection device at regular intervals, and the wireless connection device notifies the wireless telephone when receiving the synchronization signal. In the mobile communication system for transmitting a signal, the wireless telephone performs the battery saving synchronization management of the wireless connection device and the wireless telephone by receiving the notification signal,
The wireless connection device sets a guard time to a predetermined time adjacent to the time before receiving the synchronization signal from the wireless channel control device, and in this guard time, prohibits incoming and outgoing calls of the wireless telephone. Resetting a battery saving period management timer after transmitting the last bit of the last frame of the notification signal, and resetting the battery saving period management timer after the wireless telephone has finished receiving the last bit of the last frame of the notification signal. A mobile communication system characterized by the following.
JP62310377A 1987-12-07 1987-12-07 Mobile communication system Expired - Fee Related JP2604767B2 (en)

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JP62310377A JP2604767B2 (en) 1987-12-07 1987-12-07 Mobile communication system

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Application Number Priority Date Filing Date Title
JP62310377A JP2604767B2 (en) 1987-12-07 1987-12-07 Mobile communication system

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JPH01149623A JPH01149623A (en) 1989-06-12
JP2604767B2 true JP2604767B2 (en) 1997-04-30

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JP62310377A Expired - Fee Related JP2604767B2 (en) 1987-12-07 1987-12-07 Mobile communication system

Country Status (1)

Country Link
JP (1) JP2604767B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL94773A (en) * 1989-06-26 1994-11-11 Motorola Inc Synchronization and equalization in a tdma cellular system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6052133A (en) * 1983-09-01 1985-03-25 Nippon Telegr & Teleph Corp <Ntt> Intermittent reception system of mobile station in mobile radio

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
D.C.Cox"Universal Portable Radio Communications",Proc.IEEE Vol.75 No.4 PP.436−477 Apr.1987

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