JPS62226741A - Radio data communication method - Google Patents
Radio data communication methodInfo
- Publication number
- JPS62226741A JPS62226741A JP61070145A JP7014586A JPS62226741A JP S62226741 A JPS62226741 A JP S62226741A JP 61070145 A JP61070145 A JP 61070145A JP 7014586 A JP7014586 A JP 7014586A JP S62226741 A JPS62226741 A JP S62226741A
- Authority
- JP
- Japan
- Prior art keywords
- channel
- line
- transmission
- dummy signal
- data communication
- 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
- 238000004891 communication Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は無線データ通信システム、特に複数の端末が複
数の無線チャネルを共有し、送信前にキャリア・センス
を行ってチャネルの空きを確認し、チャネルが空いてい
るときにのみ送信権を獲得するような無線データ通信シ
ステムの通信方法に関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a wireless data communication system, in particular, a wireless data communication system in which multiple terminals share multiple wireless channels, and carrier sense is performed to check channel availability before transmission. , relates to a communication method for a wireless data communication system in which a transmission right is acquired only when a channel is vacant.
（従来の技術）
近年、移動通信の分野では回線をより有効に利用するた
めに複数の無線チャネルを共有し、チャネルを使用する
場合にはその回線を観測し、空いていることを確認して
から送信する手法が導入され始めている。その−例はコ
ード・レス電話システムである。このコード・レス電話
の無線方式は雑誌施設−３６−３、川崎、加藤、吉沢の
解説記事［新しいコード・レス電話」に詳述されている
。この方式においては各端末は制御チャネルで待ちうけ
、通信しようとする端末はまず自局の受信チャネルを観
測し空いていることを確認してから相手端末へそのチャ
ネル情報を送る。相手端末でもその受信チャネルが空い
ていることを確認してから通信を開始する。一般に無線
器は受信チャネルは観測できても送信チャネルは観測で
きないので上述のような制御チャネルを用いて互いの受
信チャネルを確認することが必要となる。(Conventional technology) In recent years, in the field of mobile communications, multiple wireless channels are shared in order to make more effective use of lines, and when a channel is used, the line is monitored to confirm that it is free. A method of transmitting data from An example of this is cordless telephone systems. The wireless system of this cordless telephone is detailed in the explanatory article [New Cordless Telephone] by Kawasaki, Kato, and Yoshizawa, Magazine Facility-36-3. In this system, each terminal waits on a control channel, and a terminal attempting to communicate first observes its own reception channel to confirm that it is free, and then sends the channel information to the other terminal. Start communication after confirming that the reception channel on the other party's terminal is also free. Generally, radio devices can observe reception channels but cannot observe transmission channels, so it is necessary to confirm each other's reception channels using the above-mentioned control channel.
一般にデータ通信においては、データの発生はバースト
的でありしかも端末あたりのトラヒックは少い。このよ
うなトラヒックに対して常に無線回線を確保しておくこ
とは周波数資源の無駄使いとなる。従ってデータ送信終
了後は速やかに送信を停止し回線を解放することが望ま
しい。一方、一度目線を解放すると再び接続するために
は上述の手続きを踏まなくてはならず、また回線解放の
ためにも制御チャネルへ解放信号を送信する必要がある
ため、あまり頻繁に回線の接続、解放を行うと制御チャ
ネルが混雑する。この対策としてデータを伝送していな
くても一定時間（例えば２秒間）は解放手続きを行なわ
ず、一定時間経過後に始めて解放手続きを行う方法が考
えられる。こうすることにより制御チャネルの混雑を減
少させることができる。Generally, in data communications, data is generated in bursts and the traffic per terminal is small. Always securing a wireless line for such traffic is a waste of frequency resources. Therefore, it is desirable to immediately stop the transmission and release the line after data transmission is completed. On the other hand, once the line is released, the above procedure must be followed in order to reconnect, and it is also necessary to send a release signal to the control channel to release the line, so the line is not connected too often. , when the release is performed, the control channel becomes congested. As a countermeasure to this problem, a method can be considered in which the release procedure is not performed for a certain period of time (for example, 2 seconds) even if no data is being transmitted, and the release procedure is performed only after a certain period of time has elapsed. By doing so, congestion on the control channel can be reduced.
（発明が解決しようとする問題点）
上述のようなデータ伝送システムにおいて、送信も受信
もしない状態が例え２秒以下でも生じると、その間に他
のシステムがキャリア・センスを行ない回線が空いてい
ると判定して通信を開始する可能性がある。このような
場合には自局が再び送信を開始して他局に対して干渉を
与えてしまう可能性がある。本発明の目的はこのような
干渉を回避する通信方式を提供することにある。(Problem to be solved by the invention) In the data transmission system as described above, if a state in which neither transmission nor reception occurs even for less than 2 seconds, other systems perform carrier sense during that time and the line becomes vacant. There is a possibility that the communication will be started based on the determination. In such a case, the local station may start transmitting again and cause interference to other stations. An object of the present invention is to provide a communication system that avoids such interference.
（問題点を解決するための手段）
本発明においては上述の従来の問題点を解決するために
各端末ではデータ送信終了後も一定時間ダミー信号を送
信するとともに、送信も受信もしていない状態では直ち
に回線を開放するようにしている。(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention transmits a dummy signal for a certain period of time even after data transmission is completed in each terminal, and when the terminal is not transmitting or receiving data, We are trying to open the line immediately.
（作用）
無線データ通信システムにおいてキャリア・センスを実
行する場合には上り、下り両方のチャネルをセンスする
必要がある。この点を利用して本発明においては回線を
解放するまでは常に上り、下りいずれかのチャネルに送
信するようにして他システムとの干渉を防ぐようにする
。(Operation) When carrying out carrier sensing in a wireless data communication system, it is necessary to sense both upstream and downstream channels. Taking advantage of this point, the present invention always transmits to either the upstream or downstream channel until the line is released, thereby preventing interference with other systems.
（実施例）
次に図面を参照して本発明について詳細に説明する。第
２図に本発明の用いられる無線データ通信システムの例
を示す。第２図の例ではホストと端末間の通信を行う２
つのシステムが同一周波数帯を共有している。互いのシ
ステムで送信された電波は、同一周波数であれば互いに
干渉を起こすことになる。第３図に従来の通信方式の動
作を示す。図中制御チャネル上の数字は制御チャネルを
使用しているシステムの番号を示す。また矢印はデータ
・パケットの到着時刻を示す。接続手順により接続が完
了した後にはデータを送信し終わるとすぐに送信を停止
する。従って例えば端末からホストへメツセージを送信
し応答が帰るまでの時間は送信も受信もしていない状態
になる。この時間が２秒以内である場合には回線は保持
された応答が到着するとホストはキャリア・センスせず
に送信を行なう。一方システム２に、ある時点でパケッ
トが到着すると端末は受信チャネルのセンスを開始する
。(Example) Next, the present invention will be described in detail with reference to the drawings. FIG. 2 shows an example of a wireless data communication system in which the present invention is used. In the example in Figure 2, 2 communicates between the host and the terminal.
two systems share the same frequency band. Radio waves transmitted by each system will interfere with each other if they are on the same frequency. FIG. 3 shows the operation of the conventional communication system. In the figure, the numbers on the control channel indicate the number of the system using the control channel. Also, the arrow indicates the arrival time of the data packet. After the connection is completed according to the connection procedure, the data transmission is stopped immediately after the data transmission is completed. Therefore, for example, during the time from when a message is sent from a terminal to a host until a response is returned, there is no sending or receiving. If this time is within 2 seconds, the host transmits without carrier sensing when a response that is held on the line arrives. On the other hand, when a packet arrives at system 2 at a certain point, the terminal starts sensing the reception channel.
システム１での下りメツセージが終了した時点で回線が
空いたと判断して接続要求を制御チャネルに送信する。When the downlink message in system 1 ends, it is determined that the line is free and a connection request is sent to the control channel.
この時点で上りチャネルにシステム１がデータを送信し
ていないと、システム２のホスト側でも回線が空いてい
ると判断してＡＣＫ信号を返し接続が成立する。以上の
動作が２秒以内に完了しシステム１で再びメツセージが
到着するとシステム１のメツセージとシステム２のメツ
セージが干渉を起こしてしまう。If System 1 is not transmitting data to the upstream channel at this point, the host side of System 2 also determines that the line is free and returns an ACK signal to establish a connection. If the above operation is completed within 2 seconds and a message arrives again at system 1, the message from system 1 and the message from system 2 will cause interference.
これに対して本発明の動作を第１図に示す。本発明にお
いてはデータ送信終了後にダミー信号を一定時間だけ送
信している。このダミー信号の部分を第１図で斜線で示
している。第１図にあるようにダミー信号があるために
システム１で上りチャネルと下りチャネルが同時に空く
ような状態は回線が開放されるまでは生じない。従って
仮にシステム２でシステム１の通信中に下りチャネルの
空きを検出して接続要求信号を送出しても、上りチャネ
ルが使用中なので接続は完了せずシステム２ではシステ
ム１がチャネルを開放するまで送信を開始することがで
きない。従って第３図で説明した従来技術のように干渉
を起こすことはない。このダミー信号の長さをどれくら
いにすれば良いかはシステムによって異なる。ダミー信
号が長すぎると実際にはデータを送信していないのにシ
ステムがチャネルを開放しないので効率が悪くなるし、
また逆に短かすぎると接続−開放の手続が増大するため
制御チャネルが混雑する。一般には期待されるレスポン
ス時間よりやや長めに設定しておくのが妥当である。In contrast, the operation of the present invention is shown in FIG. In the present invention, a dummy signal is transmitted for a certain period of time after data transmission is completed. This dummy signal portion is indicated by diagonal lines in FIG. As shown in FIG. 1, due to the presence of the dummy signal, a situation in which the upstream and downstream channels are simultaneously available in system 1 does not occur until the line is released. Therefore, even if system 2 detects a free downstream channel while system 1 is communicating and sends a connection request signal, the connection will not be completed because the upstream channel is in use, and system 2 will wait until system 1 releases the channel. Unable to start sending. Therefore, interference does not occur unlike the prior art described in FIG. 3. The length of this dummy signal varies depending on the system. If the dummy signal is too long, the system will not release the channel even though no data is actually being sent, resulting in poor efficiency.
On the other hand, if it is too short, the number of connection and release procedures increases, resulting in congestion of the control channel. Generally, it is appropriate to set the response time slightly longer than the expected response time.
（発明の効果）
以上詳細に記したように本発明によれば干渉を起こすこ
とのない無線データ通信方法を提供することができる。(Effects of the Invention) As described in detail above, according to the present invention, it is possible to provide a wireless data communication method that does not cause interference.
Claims (1)
きにのみ回線を確保し、送信権を獲得する無線データ通
信システムにおいて、データ送信終了後も一定時間ダミ
ー信号を送信し送信も受信も行っていなときには直ちに
回線を開放する動作を開始することを特徴とした無線デ
ータ通信方法。In a wireless data communication system in which each terminal performs carrier sense and secures a line only when the line is free and acquires the right to transmit, a dummy signal is sent for a certain period of time even after data transmission is completed, and both transmission and reception are performed. A wireless data communication method characterized by immediately starting an operation to release a line when a line is not available.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61070145A JPS62226741A (en) | 1986-03-27 | 1986-03-27 | Radio data communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61070145A JPS62226741A (en) | 1986-03-27 | 1986-03-27 | Radio data communication method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62226741A true JPS62226741A (en) | 1987-10-05 |
Family
ID=13423113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61070145A Pending JPS62226741A (en) | 1986-03-27 | 1986-03-27 | Radio data communication method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62226741A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6643296B1 (en) | 1997-07-04 | 2003-11-04 | Fujitsu Limited | System for controlling frame collision |
| US7068677B1 (en) | 1997-10-20 | 2006-06-27 | Fujitsu Limited | Subscriber radio access system |
| JP2008507904A (en) * | 2004-07-21 | 2008-03-13 | クゥアルコム・インコーポレイテッド | Method for providing a gap indication during sticky assignment |
| US8432803B2 (en) | 2004-07-21 | 2013-04-30 | Qualcomm Incorporated | Method of providing a gap indication during a sticky assignment |
| US9480074B2 (en) | 2004-07-23 | 2016-10-25 | Qualcomm Incorporated | Enabling quick and easy demodulation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59183552A (en) * | 1983-04-04 | 1984-10-18 | Hitachi Ltd | Multiplex accessing system |
| JPS6120447A (en) * | 1984-07-06 | 1986-01-29 | Hitachi Ltd | Information communication control method |
-
1986
- 1986-03-27 JP JP61070145A patent/JPS62226741A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59183552A (en) * | 1983-04-04 | 1984-10-18 | Hitachi Ltd | Multiplex accessing system |
| JPS6120447A (en) * | 1984-07-06 | 1986-01-29 | Hitachi Ltd | Information communication control method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6643296B1 (en) | 1997-07-04 | 2003-11-04 | Fujitsu Limited | System for controlling frame collision |
| US7068677B1 (en) | 1997-10-20 | 2006-06-27 | Fujitsu Limited | Subscriber radio access system |
| JP2008507904A (en) * | 2004-07-21 | 2008-03-13 | クゥアルコム・インコーポレイテッド | Method for providing a gap indication during sticky assignment |
| JP2011091814A (en) * | 2004-07-21 | 2011-05-06 | Qualcomm Inc | Method of providing gap indication during sticky assignment |
| JP2011091815A (en) * | 2004-07-21 | 2011-05-06 | Qualcomm Inc | Method of providing gap indication during sticky assignment |
| JP2012142970A (en) * | 2004-07-21 | 2012-07-26 | Qualcomm Inc | Method of providing gap indication during sticky assignment |
| US8432803B2 (en) | 2004-07-21 | 2013-04-30 | Qualcomm Incorporated | Method of providing a gap indication during a sticky assignment |
| US8477710B2 (en) | 2004-07-21 | 2013-07-02 | Qualcomm Incorporated | Method of providing a gap indication during a sticky assignment |
| US8630180B2 (en) | 2004-07-21 | 2014-01-14 | Qualcomm Incorporated | Method of providing a gap indication during a sticky assignment |
| US9065608B2 (en) | 2004-07-21 | 2015-06-23 | Qualcomm Incorporated | Method of providing a gap indication during a sticky assignment |
| US9480074B2 (en) | 2004-07-23 | 2016-10-25 | Qualcomm Incorporated | Enabling quick and easy demodulation |
| US9871617B2 (en) | 2004-07-23 | 2018-01-16 | Qualcomm Incorporated | Method of optimizing portions of a frame |
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