JPS58119240A - Mobile radio communicating system - Google Patents
Mobile radio communicating systemInfo
- Publication number
- JPS58119240A JPS58119240A JP57001655A JP165582A JPS58119240A JP S58119240 A JPS58119240 A JP S58119240A JP 57001655 A JP57001655 A JP 57001655A JP 165582 A JP165582 A JP 165582A JP S58119240 A JPS58119240 A JP S58119240A
- Authority
- JP
- Japan
- Prior art keywords
- synchronizing signal
- mobile
- call information
- time
- call
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
Abstract
Description
【発明の詳細な説明】
〔発明の属する分野〕
本発明は移動無線通信方式の発呼情報送出制御に関する
。特に、少ない数の通信チャンネルＫｌ数の移動局が発
呼することができるように構成されたマルチアクセス方
式で、二以上の移動局が偶然に同時に発呼情報を送出す
るいわゆる衝突を少なくするための改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to call information transmission control in a mobile radio communication system. In particular, in a multi-access system configured so that mobile stations with a small number of communication channels Kl can make calls, this is to reduce so-called collisions in which two or more mobile stations accidentally send out call information at the same time. Regarding improvements.
一つの通信チャンネルに、二以上の移動局が同時に発呼
情報を送信すると、衝突状態となって基地局でその情報
を正しく受信することができなくなる。移動局では発呼
情報が正しく受信されなかったことをＩｌＮ！識すると
、再度発呼情報を送信する。If two or more mobile stations simultaneously transmit call information on one communication channel, a collision will occur and the base station will not be able to correctly receive the information. The mobile station indicates that the call information was not received correctly. When the call information is recognized, the call information is sent again.
最初に発呼情報を送信してから、これが無効でめつ友こ
とを知って再度発呼情報を送信するまでの時間は、はじ
めに衝突を起した二つの移動局でｔｌとんど等しくなる
ので、再度の発呼情報送信で再び衝突を起すことになる
。このような現象が繰返えされることになると、通信の
設定が不可能であるとともに、通信チャンネルが有効に
利用されないことになる。The time from when the first call information is transmitted to when the two mobile stations that initially collided transmit the call information again after learning that the call information was invalid is almost equal to tl. , a collision will occur again when the calling information is sent again. If such a phenomenon is repeated, communication settings will not be possible and the communication channel will not be used effectively.
本発明はこのように複数の移動局から送信される発呼要
求情報が、度重ねて衝突する現象を回避する移動無線通
信方式を提供することを目的とする。An object of the present invention is to provide a mobile radio communication system that avoids the phenomenon in which call request information transmitted from a plurality of mobile stations repeatedly collides with each other.
本発明は、基地局［１ｍチャンネルに常時同期信号を送
信しておき、移動局は少なくとも発呼要求情報を送信す
るときにはこの同期信号を受信して、この同期信号から
ランダムタイマで計時した時刻のタイムスロットに発呼
要求情報を送信することを特徴とする。The present invention constantly transmits a synchronization signal to the base station [1m channel, and the mobile station receives this synchronization signal at least when transmitting call request information, and calculates the time measured by a random timer from this synchronization signal. It is characterized by transmitting call request information in time slots.
第１図は移動無線方式の概念図で、基地局１にはその通
信エリア内に多数Ｎ個の移動局２１．２２、・・・・・
・２Ｎがある。この基地局１は上記Ｎより少ないＭ個の
通信チャンネルがあシ、移動局側から発呼する場合には
、このＭ個の通信チャンネル０うちの空チャンネルを選
んで、発呼情報を送信する。FIG. 1 is a conceptual diagram of a mobile radio system, in which a base station 1 has a large number of N mobile stations 21, 22, . . . within its communication area.
・There is 2N. This base station 1 has M communication channels, which is less than the above N. When a mobile station makes a call, it selects an empty channel among these M communication channels and transmits the call information. .
ここでは発呼情報は、デジタル信号で例えば１２００ｂ
ｉ ｔ／ＢのＦ８に信号で、その長さは約２０ビツトで
ある。発呼情報を受信し九基地局ＩＦｉこれをデコード
して、公知の手段により通信回線の設定を行う。Here, the call information is a digital signal, for example, 1200b.
It is a signal at F8 of it/B, and its length is about 20 bits. The nine base stations IFi receive the call information, decode it, and set up a communication line using known means.
本発明方式では、上記通信チャンネルとけ別の一つの周
波数を割当てた制御チャンネルに、基地８１から同期信
号が送信される。In the system of the present invention, a synchronization signal is transmitted from the base 81 to a control channel to which a frequency different from the communication channel is assigned.
第２図は本発明実施例方式の移動局装置のうち、本発明
に直接関係ある部分のブロック構成図である。発呼検出
回路５ｕ、ハンドセットのオフフックを検出する回路で
あって、発呼要求があったことを検出すると、この信号
をタイマ回路６に与える。タイマ回路６には、受信回路
７の出方から前述の同期信号を抽出する同期信号抽出回
路８の出力が加えられていて、この同期信号をトリガに
して計時を行う。FIG. 2 is a block diagram of a portion of the mobile station device according to the embodiment of the present invention that is directly related to the present invention. The call detection circuit 5u is a circuit for detecting off-hook of the handset, and when it detects that there is a call request, it gives this signal to the timer circuit 6. The timer circuit 6 is supplied with the output of a synchronization signal extraction circuit 8 that extracts the synchronization signal described above from the output of the reception circuit 7, and uses this synchronization signal as a trigger to measure time.
この計時は複数り個があらかじめ設定されて込て、これ
がランダムに現われるように構成される。This timer is configured so that a plurality of clocks are preset and appear randomly.
すなわち同期信号の直後につづくタイムスロットまでの
第１番目の時間から、トリガとし九同期信号から数えて
第り番目のタイムスロットまでの第り番目の時間まで、
６個が用意され、このうちの１個がランダムに選択され
るように構成される。That is, from the first time up to the time slot immediately following the synchronization signal to the third time up to the third time slot counting from the ninth synchronization signal as a trigger,
Six pieces are prepared, and one of them is selected at random.
もつとも、このランダム選択は、基地局１に通信する移
動局２があらかじめ定められている場合には、この移動
局２の各々についてランダムであれば、１個の移動局に
ついては固定的であって本よい。However, if the mobile stations 2 that communicate with the base station 1 are determined in advance, this random selection is random for each mobile station 2, and is fixed for one mobile station. This is good.
この計時が完了した時刻に、送信回路９ Ｋ ） ＩＪ
ガ入力が与えられ、公知の手段により発呼情へか発生さ
れ、結合回路１０を介してアンテナ１１からとの発呼情
報が送信される。At the time when this timing is completed, the transmitting circuit 9K)IJ
The antenna 11 receives an input signal, generates call information by known means, and transmits the call information from the antenna 11 through the coupling circuit 10.
第３図は上記タイマ回路６の計時を説明するタイムチャ
ートである。第５図体）は移動局で受信される同期信号
であって、同（Ｂ）＃ｉ発呼情報を送信することの可能
なタイムスロットを示す。同（ｃｌ）〜（’ ＣＬ）は
、それぞれ時間ｔ１〜ｔｒ、を計時して、計時が完了し
たときにそれぞれ斜線を付したタイミンクに、発呼情報
が送信されることを示す。この計時すべき時間ｔ１〜ｔ
ＬＦ′ｉランダムに現われる。FIG. 3 is a time chart illustrating time measurement by the timer circuit 6. As shown in FIG. Figure 5) is a synchronization signal received by the mobile station, and shows a time slot in which (B) #i call information can be transmitted. (cl) to ('CL) indicate that times t1 to tr are counted, respectively, and call information is transmitted at the shaded timings when the timing is completed. This time period t1 to t to be measured
LF′i appears randomly.
このように構成することにより、複数の移動局で同時に
オフフックされ、発呼情報の送信が衝突することがあっ
ても、これが繰返し衝突するようなことはなくなり、通
信回線の設定が迅速になる。With this configuration, even if a plurality of mobile stations go off-hook at the same time and the transmission of call information collides, repeated collisions will not occur, and the communication line can be set up quickly.
なお、上記実施例では第１回目の発呼からランダムな時
間計時が行われるように述べたが、第１回目の発呼に限
りタイマ回路６の動作を禁止して、第１回目はオフフッ
クと同時に発呼情報を送信するように構成することがで
きる。この場合ＶＣｉｄタイマ回路６の構成はわずかに
複緒になるが、第１回目の発呼には発呼情報送出までに
要する無駄な時間がなくなる利点がある。In the above embodiment, it was described that a random time is counted from the first call, but the operation of the timer circuit 6 is prohibited only for the first call, and the first call is off-hook. It can be configured to transmit call information at the same time. In this case, the configuration of the VCid timer circuit 6 is slightly complicated, but the first call has the advantage that there is no wasted time required until the call information is sent.
以上述べたように本発明の方式によれば、発呼情報が衝
突する確率は小さくなり、通信回線の利用効率が向上す
る。As described above, according to the system of the present invention, the probability that call information will collide is reduced, and the efficiency of use of communication lines is improved.
一般にある程度の長い時間にわたって、発呼要求が生起
する確率が一様であるとすると、本発明の方式を実施し
ても、第１回目の発呼情報の送信が衝突する確率は低く
ならない。しかし、発呼情報が正しく受信されなかった
ことを移動局が認識すると、再度発呼要求を行うので、
これが再び衝突する確率は、本発明を実施することによ
りきわめて低くなる。Assuming that the probability of a call request occurring is generally uniform over a certain amount of time, even if the method of the present invention is implemented, the probability that the first transmission of call information will collide will not be reduced. However, if the mobile station recognizes that the call information was not received correctly, it will issue a call request again.
The probability of this collision happening again becomes extremely low by implementing the present invention.
本発明を実施すると、発呼要求すなわちハンドセットの
オフフックから、発呼情報送信までの時間が長くなるが
、これは実用上はとんど問題にならない時間である。When the present invention is implemented, the time from the call request, that is, the off-hook of the handset, to the transmission of the call information becomes long, but this is a time that is rarely a problem in practice.
第１図は本発明を実施する移動無線通信方式の概念図。
第２図は本発明実施例の移動局装置の要部ブロック構成
図。
第３図は動作説明用のタイムチャート。
１・・・基地局、２・・・移動局、５・・・発呼検出回
路、６・・・タイマ回路、７・・・受信回路、８・・・
同期信号抽出回路、９・・−送信回路、１０・・・結合
回路、１１−・ア特許出願人 日本電気株式会社
代理人 弁理士井 出 面 孝FIG. 1 is a conceptual diagram of a mobile radio communication system implementing the present invention. FIG. 2 is a block diagram of main parts of a mobile station device according to an embodiment of the present invention. FIG. 3 is a time chart for explaining the operation. DESCRIPTION OF SYMBOLS 1... Base station, 2... Mobile station, 5... Call detection circuit, 6... Timer circuit, 7... Receiving circuit, 8...
Synchronous signal extraction circuit, 9...-transmission circuit, 10...coupling circuit, 11--a Patent applicant Takashi Idemen, patent attorney and agent for NEC Corporation
Claims (1)
多数の移動局がマルチアクセスすることにょシこの通信
チャンネルを共用するように構成された移動通信方式に
おいて、 基地局に＃ｉ、上記通信チャンネル以外の周波数で同期
信号を常時送信する手段を備え、各移動局には、この同
期信号を受信する手段と、この同期信号により起動する
タイマ回路と、発呼情報送出要求に対してこのタイマ回
路がランダムに計時して指定するタイムスロットで発呼
情報を送信するように制御する手段と を備えたことを特徴とする移動無線通信方式。(1) In a mobile communication system configured so that one or more communication channels received by a base station are shared by a large number of mobile stations for multiple access, the base station receives #i and the above communication channel. Each mobile station is equipped with a means for constantly transmitting a synchronization signal at a frequency other than the above frequency, and each mobile station has a means for receiving this synchronization signal, a timer circuit activated by this synchronization signal, and a timer circuit activated in response to a call information transmission request. 1. A mobile radio communication system, comprising: means for randomly measuring time and controlling the transmitting call information in designated time slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001655A JPS58119240A (en) | 1982-01-07 | 1982-01-07 | Mobile radio communicating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001655A JPS58119240A (en) | 1982-01-07 | 1982-01-07 | Mobile radio communicating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58119240A true JPS58119240A (en) | 1983-07-15 |
Family
ID=11507533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57001655A Pending JPS58119240A (en) | 1982-01-07 | 1982-01-07 | Mobile radio communicating system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58119240A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994021056A1 (en) * | 1993-03-05 | 1994-09-15 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
| JP2688686B2 (en) * | 1993-03-05 | 1997-12-10 | エヌ・ティ・ティ移動通信網株式会社 | CDMA random access communication method and mobile station apparatus using the same |
-
1982
- 1982-01-07 JP JP57001655A patent/JPS58119240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994021056A1 (en) * | 1993-03-05 | 1994-09-15 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
| US5581547A (en) * | 1993-03-05 | 1996-12-03 | Ntt Mobile Communications Network Inc. | Random access communication method by CDMA and mobile station equipment using the same |
| JP2688686B2 (en) * | 1993-03-05 | 1997-12-10 | エヌ・ティ・ティ移動通信網株式会社 | CDMA random access communication method and mobile station apparatus using the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0192305B1 (en) | Arrangement for transmitting digital data | |
| US3634627A (en) | Channel-allocation system for a channel-addressing multiple-access telecommunication system | |
| US5293380A (en) | Frame synchronization system among multiple radio base stations for TDMA digital mobile communications system | |
| EP0270216B1 (en) | Dynamic frame length communication system, and stations for such a system | |
| EP0594342B1 (en) | Prioritizing a multiple access channel in a wireless telephone system | |
| JP2815391B2 (en) | Communication transmission system | |
| JPS635935B2 (en) | ||
| KR950700652A (en) | Apparatus and method for reducing message collisions between mobile stations accessing base stations in CDMA cellular communication devices at the same time | |
| US4631718A (en) | Method and device for synchronization of system timing | |
| US4145657A (en) | Radio transmission system for two subscribers to have a mutual connection on one of several frequency channels and having time multiplex interlace of preferred channels | |
| AU724295B2 (en) | Method and device to determine the transmission point in time of a first transfer in relation to another transfer in a radio medium | |
| CA2015494C (en) | Mobile telephone system | |
| US3603932A (en) | Party line stations for selective calling systems | |
| JPS58119240A (en) | Mobile radio communicating system | |
| SE446240B (en) | TRANSMISSION DEVICE FOR INFORMATION TRANSFER DEVICE WITH AT LEAST TWO DIFFERENT DEVICES | |
| KR100441473B1 (en) | Radio paging systam | |
| JP2001333081A (en) | Wireless communication equipment and computer- readable storage medium | |
| JPH04373331A (en) | Control signal transmitting method | |
| GB1144010A (en) | Mobile telephone system | |
| JPH0423525A (en) | Radio packet multiple address communication control system | |
| JP2536214B2 (en) | Cordless phone calling | |
| JPS5853242A (en) | Radio telephone system of multichannel access system | |
| JPH04111545A (en) | Control channel constituting method for mobile communication | |
| JPH07322351A (en) | Random access control radio communication system | |
| JPH0821935B2 (en) | Data transmission equipment |