JPS5815344A - Controlling method for data line - Google Patents
Controlling method for data lineInfo
- Publication number
- JPS5815344A JPS5815344A JP56113757A JP11375781A JPS5815344A JP S5815344 A JPS5815344 A JP S5815344A JP 56113757 A JP56113757 A JP 56113757A JP 11375781 A JP11375781 A JP 11375781A JP S5815344 A JPS5815344 A JP S5815344A
- Authority
- JP
- Japan
- Prior art keywords
- mobile
- polling
- signal
- earth station
- selection
- 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.)
- Granted
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
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はバス、トラック、乗用車、鉄道車両、モルレー
ル車両等の複数移動体と地上局間のデータ伝送を限定さ
れたデータ通信エリア（ａｒｅａ）内で同時に行なう場
合のデータ回線制御方法の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for transmitting data between multiple moving objects such as buses, trucks, passenger cars, railway vehicles, and mole rail vehicles and a ground station at the same time within a limited data communication area (area). This paper relates to improvements in line control methods.
従来は上記移動体と地上局間のデータ伝送において定め
られた同一交信エリア内の複数の移動体（すなわち移動
局）と地上局間のデータ回線の制御手順には、地上局を
主局とし移動局を従局としたポーリング／セレクテイン
グ方式が一般に使用されている。しかし実情は移動体の
台数は多くしかも交信エリア内の同時交信移動体数は比
較的少ないという場合が一般に多く、常時全移動体をポ
ーリングすることは伝送効率上適当でない。このためデ
ータ回線を使用して全移動局に・データ送受要求の問合
わせを間欠的に行なうか、ポーリングの対象とすべき移
動体を他の手段を用いて認識する方法が行われている。Conventionally, the procedure for controlling data lines between multiple mobile units (i.e., mobile stations) and the ground station within the same communication area, which was determined in the data transmission between the mobile units and the ground station, involves using the ground station as the main station and moving A polling/selecting method in which stations are subordinate stations is generally used. However, in reality, the number of mobile units is large and the number of mobile units communicating simultaneously within a communication area is generally relatively small, and it is not appropriate in terms of transmission efficiency to constantly poll all mobile units. For this reason, a method is used in which a data line is used to intermittently inquire of all mobile stations regarding data transmission/reception requests, or by other means to identify mobile units to be polled.
しかし前者は間合せでない時間帯に交信エリア（二進入
して来る移動体に対するポーリングが遅れるので、デー
タ伝送の効率が悪く、後者はコストが高くなるという欠
点かある。 パ
本発明は上記の欠点を除くために行ったもので、限定さ
れた交信エリアでの複数の移動体と地上局間のポーリン
グ／セレクショング方式によるデータ伝送回線制御にお
いて、伝送効率を低下させずに交信を競合なく行わせる
ことが特徴である。以下図面を用いて詳細に説明する。However, the former has the disadvantage of poor data transmission efficiency due to a delay in polling for moving objects entering the communication area (2) at times when the communication area is not on time, and the latter has the disadvantage of increasing costs. This was done to eliminate contention in data transmission line control using the polling/selection method between multiple mobile units and ground stations in a limited communication area, without reducing transmission efficiency. This is a characteristic feature.This will be explained in detail below using the drawings.
第１図は本発明を実施した地上局および移動局の通信系
の構成側図である。図中の１は送信増幅部、２は受信部
（受信４号を選択増幅する）、８は送受共用アンテナで
、■、２ と８間の整合、分岐を行うハイブリッド合成
器等は図示省略しである。４はモデム、５はモデムイン
ターフェイス、６はデータ端末である。モデム４はモデ
ムインターフェイス５によってデータ端末６に接続され
、データ信号の変調、復調や搬送波の検出を行う機能を
持っている。データ端末６は回線状況を常時モニターし
ながらポーリング／セレクショングの手順を実施する機
能を備えている。このデータ端末６の回線制御機能は以
下の説明より明らかなように、地上局と移動局とでは異
なっている。FIG. 1 is a side view of the configuration of a communication system of a ground station and a mobile station implementing the present invention. In the figure, 1 is a transmitting amplification section, 2 is a receiving section (selectively amplifies the receiving signal 4), 8 is a transmitting and receiving antenna, and the hybrid combiner that performs matching and branching between 2 and 8 is not shown. It is. 4 is a modem, 5 is a modem interface, and 6 is a data terminal. The modem 4 is connected to a data terminal 6 by a modem interface 5, and has functions of modulating and demodulating data signals and detecting carrier waves. The data terminal 6 has a function of performing polling/selection procedures while constantly monitoring the line status. As will be clear from the following explanation, the line control function of the data terminal 6 is different between the ground station and the mobile station.
第２図は地上局と交信エリア内に順次進入してくる移動
体との間のデータ回線の制御方法の説明図である。たゾ
じ説明の便宜上対応する移動体を８台とし、それぞれＩ
〜■と命名するが、以下の説明は移動体が任意の数であ
っても適用可能である。第２図最上段ａは地上局の送信
動作のタイムテーブルで、太線の部分は任意の移動体に
対するデータ要求トリガ信号（以下簡単にトリガ信号と
記す）または交信する対象として認められた移動体に対
するポーリング／セレクション信号の送出時間を示し、
その上方のＴはトリガ信号であることを、Ｂ−１−Ｂ−
８は移動局■〜Ｎに対するポーリング／セレクション信
号であることをそれぞれ表わしている。またａの細線の
部分は地上局が待機（受信と監視）状態（：ある時間帯
を示している。FIG. 2 is an explanatory diagram of a method of controlling data lines between a ground station and mobile objects that successively enter the communication area. For convenience of explanation, we will assume that there are 8 corresponding moving objects, and each
Although the names are named as ~■, the following explanation can be applied even if there is an arbitrary number of moving objects. The top row a of Figure 2 is a timetable for the transmission operation of the ground station, and the bold line part is a data request trigger signal (hereinafter simply referred to as a trigger signal) for any mobile object or a mobile object recognized as a communication target. Indicates the polling/selection signal transmission time,
B-1-B-
8 represents polling/selection signals for mobile stations ① to N, respectively. The thin line in a indicates the ground station is in a standby (receiving and monitoring) state (: a certain time period).
次に第２図中のｂ−１−ｂ−８はそれぞれ移動体■〜冒
のデータ送信動作を示し、太線はデータ送出時間帯、細
線は待機状態にある時間帯をそれぞれ表わしている。ま
たΔ印は移動体が交信エリアに進入時点を示し、破線の
部分は移動体が交信エリア外（＝いる状態を表わしてい
る。Next, b-1 to b-8 in FIG. 2 indicate the data transmission operations of the mobile units 1 to 3, respectively, with thick lines representing data transmission time periods and thin lines representing standby time periods. Further, the Δ mark indicates the point in time when the mobile object enters the communication area, and the broken line portion represents the state in which the mobile object is outside the communication area.
第８図は第２図中のポーリング／セレクションのシーケ
ンスの説明図で、図中のａｏは地上局の受信信号のタイ
ムチャートである。ａｏの■〜■の部分はトリガ信号や
ポーリング／セレクション信号送出直後の第２図（＝も
示しである監視時間帯Ｗ内のタイムスロットを表わし、
移動体にはあらかじめこのタイムスロットの１つを割当
て＼おく。すなわち移動体は地上局に対して自局へのポ
ーリングセレクションサービス要求を■〜■中の１つの
割当られたタイムスロットにおいて送出するように定め
ておく。■〜■のタイムスロットはサービス情報の有無
を含むだけで十分であるから一般（二その時間幅はデー
タの長さに比べて十分小さＩ／）。FIG. 8 is an explanatory diagram of the polling/selection sequence in FIG. 2, and ao in the diagram is a time chart of the received signal of the ground station. The portions ■ to ■ of ao represent the time slots within the monitoring time zone W in FIG. 2 (= is also shown) immediately after the trigger signal and polling/selection signal are sent
One of these time slots is assigned to the moving object in advance. That is, the mobile unit specifies that the mobile unit should send a polling selection service request to the ground station in one of the allocated time slots from ① to ③. The time slots (2) to (2) are generally sufficient to include the presence or absence of service information (2) their time widths are sufficiently small compared to the length of the data.
また移動体からの送出データは地上局のポーリング／セ
レクション信号を受信後時間Ｗを置し）た時点から送出
される。このように移動体よりのデータ送出はサービス
要求のタイムスロットと時間的（＝ずらせて行うように
する。Furthermore, data to be transmitted from the mobile unit is transmitted at a time W after receiving the polling/selection signal from the ground station. In this way, the data transmission from the mobile unit is performed in a time-synchronized manner (=shifted from the time slot of the service request).
さて第２図によって動作を説明する。まず地上局は無交
信状態においてはトリガ信号を時間幅Ｗの休止時間帯を
置いて繰返し送信し、移動体力）らのサービス要求信号
の到来を待っている。１．Ｘま移動体Ｉが最初に交信エ
リアに進入し、ト、１」ガ信号受信直後に自局に割当て
られたタイムスロットを使用して地上局へサービス要求
信号■を送出したとする。地上局は信号■を認識し移動
体Ｉ（：対しホーリング／セレクション信号Ｂ−１を送
出スる。Now, the operation will be explained with reference to FIG. First, in a state of no communication, the ground station repeatedly transmits a trigger signal with a pause period of time width W, and waits for the arrival of a service request signal from a mobile station. 1. Assume that mobile unit I enters the communication area for the first time, and immediately after receiving the signal, sends a service request signal (3) to the ground station using the time slot assigned to it. The ground station recognizes the signal (2) and sends a hauling/selection signal B-1 to the mobile object I (2).
移動体Ｉはこれに従って信号Ｂ−１カ・らＷの時間幅を
置いてデータを送出し、次のポーリング／セレクション
信号を待つ。、なお移動体は自己のポーリング／セレク
ション信号が送られたときのみデータを送出できること
は第２図のｂ−１からも明らかである。In accordance with this, the mobile unit I transmits data with a time interval of the signals B-1, R, and W, and waits for the next polling/selection signal. It is also clear from b-1 in FIG. 2 that the mobile unit can send data only when its own polling/selection signal is sent.
このやりとりが続いている最中（：第２の移動イ本■が
交信エリア内に進入すると、同様（ニして最初に受信し
たポーリング／セレクション信号の直後時間幅Ｗ内に移
動体■にあらかじめ割当てら焚たタイムスロットを使用
して竺ビス要求イ言号■を送出する。地上局がこれを認
識すると地上局は以後移動体ｌと■に対する交互ポーリ
ング／セレクションに入り信号Ｂ−１とＢ−２とを交互
に送出する。移動体■が新たに交信に参加する場合も同
様であり、信号Ｂ−１，Ｂ−２、Ｂ−８を順に送出する
ことは第２図に示す通りである。While this exchange continues (: when the second mobile unit ■ enters the communication area, the mobile unit Using the allocated time slot, the ground station sends out the service request code B-1 and B-1.When the ground station recognizes this, the ground station enters alternate polling/selection for the mobiles L and B-1 and B-1 and B-1. -2 is sent out alternately.The same is true when the mobile unit ■ newly participates in communication, and the signals B-1, B-2, and B-8 are sent out in order as shown in Figure 2. be.
このように本発明では地上局のトリガ信号やポーリング
／セレクション信号送出の直後に複数・の移動体からの
サービス要求信号用の短時間タイムスロットを各移動体
にあらかじめ割当て＼おき、交信を希望する移動局は割
当タイムスロットにてサービス要求信号を送出し、これ
を受信した地上局は次のポーリング／セレクション信号
にてこの交信希望局のみデータを送るよう指示するので
、この交信希望局はポーリング／セレクション信号から
Ｗ時間経過後データを送る。従りて送信権を獲得した移
動体からのデータ送信とその他の交信加入希望局よりの
サービス要求とを時分割し両者の競合は除去されること
になる。In this way, in the present invention, immediately after the ground station sends a trigger signal or a polling/selection signal, a short time slot for service request signals from multiple mobile units is allocated in advance to each mobile unit, and communication is desired. The mobile station sends out a service request signal in the allocated time slot, and the ground station that receives this instructs the next polling/selection signal to send data only to this station with which it wishes to communicate. Data is sent after W time has elapsed since the selection signal. Therefore, data transmission from the mobile unit that has acquired the transmission right and service requests from other stations wishing to join communication are time-divided, and conflicts between the two are eliminated.
なお移動体の数が大きい場合には、第８図のＯは当然大
きな整数となりＷも長くなるので、データ伝送効率の低
下を招くことにもなる。この場合には第４図に示すよう
に時間幅Ｗ内のタイムスロットの数を１つにまとめサー
ビス要求信号内に移動体の各割当■〜■のポーリングサ
インをたとえば呼出符号や呼出番号のようなデータ化し
て地上局に送出するようにする。このようにすれば同一
時刻に複数の移動体がサービス要求を送出する極端な場
合を除いて、一般には競合がなく効率の良いデータ回線
制御が行われる。なお第４図中■はサービス要求時間Ｗ
内の１スロツト中に移動体高ｊから送出され地上局に受
信されるサービス要求信号を示している。Note that when the number of moving objects is large, O in FIG. 8 naturally becomes a large integer and W also becomes long, resulting in a decrease in data transmission efficiency. In this case, as shown in Fig. 4, the number of time slots within the time width W is combined into one, and the polling signs of each assignment of the mobile unit (■ to ■) are included in the service request signal, such as a call code or a call number. It will be converted into data and sent to the ground station. In this way, there is generally no contention and efficient data line control is performed, except in extreme cases where a plurality of mobile units send service requests at the same time. In Figure 4, ■ indicates the service request time W.
3 shows a service request signal transmitted from mobile height j and received by the ground station during one slot in FIG.
以上詳細に説明したように本発明方法によれば限定され
た交信エリア内の不特定の複数の移動体と地上局とのデ
ータ伝送において、従来の方法による伝送効率の低いこ
とや、ポーリング対象移動体を予知するため別の通信シ
ステムが必要でコストが高くなることを回避したデータ
回線制御が可能で、本発明の実用上の効果は顕著である
。As explained in detail above, according to the method of the present invention, in data transmission between a plurality of unspecified mobile objects and a ground station within a limited communication area, the low transmission efficiency of the conventional method and the polling target movement The practical effects of the present invention are significant, as it is possible to control data lines without increasing costs due to the need for a separate communication system for predicting body conditions.
第１図は本発明を実施した地上局および移動体の通信系
構成何区、第２図は地上局と移動体とのデータ回線の制
御方法説明図、第８図および第４図は第２図中のポーリ
ング／セレクションのシーケンスの説明図である。
ｌ・・・・送信増幅部、 ２・・・・受信増幅部、８・
・０アンテナ、 ４ｏ・・モデム、５＠・・・モデムイ
ンターフェイス、
６・・・・データ端末。
特許出願人 国際電気株式会社
代理人 大球 学
外１名Fig. 1 shows the configuration of the communication system of the ground station and mobile body implementing the present invention, Fig. 2 is an explanatory diagram of the control method of the data line between the ground station and the mobile body, and Figs. It is an explanatory diagram of the polling/selection sequence in the figure. l...Transmission amplification section, 2...Reception amplification section, 8.
・0 antenna, 4o...modem, 5@...modem interface, 6...data terminal. Patent applicant Kokusai Denki Co., Ltd. agent Okyu 1 person from outside the university
Claims (1)
上局との間のデータ伝送回線において、地上局は自局の
信号送信後一定時間内を交信中以外の移動体からのポー
リング／セレクションサービス要求受付時間帯とし、こ
の受付時間帯にサービス開始要求信号が到来すればこの
移動体のコードを記憶し、次からのポーリング／セレク
ションサービスの対象に加えると共（＝、ポーリング／
セレクション信号によって指定された移動体よりのデー
タは上記受付時間帯以後に送付するようにしたことを特
徴とするデータ回線制御方法。In a data transmission line between an arbitrary number of mobile units traveling within a limited communication area and a ground station, the ground station performs polling/selection from mobile units other than those currently communicating within a certain period of time after transmitting its own signal. If a service start request signal arrives during this reception time, the code of this mobile unit will be stored and added to the next polling/selection service target (=, polling/selection service).
A data line control method, characterized in that data from a mobile unit specified by a selection signal is sent after the reception time slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56113757A JPS5815344A (en) | 1981-07-22 | 1981-07-22 | Controlling method for data line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56113757A JPS5815344A (en) | 1981-07-22 | 1981-07-22 | Controlling method for data line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5815344A true JPS5815344A (en) | 1983-01-28 |
| JPS6367780B2 JPS6367780B2 (en) | 1988-12-27 |
Family
ID=14620361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56113757A Granted JPS5815344A (en) | 1981-07-22 | 1981-07-22 | Controlling method for data line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5815344A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59182649A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Ltd | Multiplex access system in mobile radio communication system |
| JPS62291224A (en) * | 1986-06-11 | 1987-12-18 | Fujitsu Ten Ltd | Data collection system |
| JPS6399628A (en) * | 1986-10-15 | 1988-04-30 | Matsushita Electric Works Ltd | Time division communication system |
| JPH01106530A (en) * | 1987-10-19 | 1989-04-24 | Furuno Electric Co Ltd | Communication equipment |
| US6791996B1 (en) | 1999-09-22 | 2004-09-14 | Matsushita Electric Industrial Co., Ltd. | Wireless network system and communication method employing both contention mode and contention-free mode |
-
1981
- 1981-07-22 JP JP56113757A patent/JPS5815344A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59182649A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Ltd | Multiplex access system in mobile radio communication system |
| JPS62291224A (en) * | 1986-06-11 | 1987-12-18 | Fujitsu Ten Ltd | Data collection system |
| JPS6399628A (en) * | 1986-10-15 | 1988-04-30 | Matsushita Electric Works Ltd | Time division communication system |
| JPH01106530A (en) * | 1987-10-19 | 1989-04-24 | Furuno Electric Co Ltd | Communication equipment |
| US6791996B1 (en) | 1999-09-22 | 2004-09-14 | Matsushita Electric Industrial Co., Ltd. | Wireless network system and communication method employing both contention mode and contention-free mode |
| US7457306B2 (en) | 1999-09-22 | 2008-11-25 | Matsushita Electric Industrial Co., Ltd. | Wireless network system and communication method employing both contention mode and contention-free mode |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6367780B2 (en) | 1988-12-27 |
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