JPH01175341A - Packet signal transmitting system - Google Patents
Packet signal transmitting systemInfo
- Publication number
- JPH01175341A JPH01175341A JP33596787A JP33596787A JPH01175341A JP H01175341 A JPH01175341 A JP H01175341A JP 33596787 A JP33596787 A JP 33596787A JP 33596787 A JP33596787 A JP 33596787A JP H01175341 A JPH01175341 A JP H01175341A
- Authority
- JP
- Japan
- Prior art keywords
- packet signal
- transmission error
- frame
- transmission
- control
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 51
- 230000008054 signal transmission Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はパケット信号伝送方式に関し、特にパケット信
号単位で伝送誤り制御を選択的に行うパケット信号伝送
方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packet signal transmission system, and more particularly to a packet signal transmission system that selectively performs transmission error control on a packet signal basis.
従来、この種のパケット信号伝送方式は、ＣＣＩＴＴ勧
告Ｘ、２５で代表されるように伝送されるすべてのパケ
ット信号に伝送誤り検出符号を付加することによって受
信したパケット信号の伝送誤りの有無を検査することが
でき、伝送誤りのある場合は、送信側へ同一パケット信
号の再送を要求して伝送誤りを排除するようになってい
る。Conventionally, this type of packet signal transmission system tests the presence or absence of transmission errors in received packet signals by adding a transmission error detection code to all transmitted packet signals, as typified by CCITT Recommendation X, 25. If there is a transmission error, the transmitter is requested to retransmit the same packet signal to eliminate the transmission error.
上述した従来のパケット信号伝送方式は、すべてのパケ
ット信号に伝送誤り検出符号を付加して送信し、受信し
たパケット信号の伝送誤りの有無を検査して、その結果
伝送誤りがある場合は送信側へ同一パケット信号の再送
を要求し、この再送機能によりパケット信号の伝送誤り
を排除するようになっているので、動画像データ、音声
データ等をパケット信号として伝送する場合に、これら
のデータは多少の伝送誤りは許容されるにもかかわらず
、伝送誤りが発生するとすべて再送動作か行われるので
、実時間性か損われるという欠点がある。In the conventional packet signal transmission method described above, a transmission error detection code is added to every packet signal before transmission, the received packet signal is inspected for transmission errors, and if there is a transmission error, the sending side This retransmission function eliminates packet signal transmission errors, so when transmitting video data, audio data, etc. as packet signals, these data may be Even though transmission errors are tolerated, if a transmission error occurs, a retransmission operation is performed, which has the disadvantage of impairing real-time performance.
本発明のパケット信号伝送方式は、送信側はパケット信
号の伝送誤り制御不要のフレームの制御フィールドに新
たに定義したビットパタンを付加して送信し、受信側は
前記フレームを受信したときはこのフレームについては
伝送誤り制御を行わないことを特徴とする。In the packet signal transmission method of the present invention, the transmitting side adds a newly defined bit pattern to the control field of a frame that does not require transmission error control of the packet signal, and transmits it, and when the receiving side receives the frame, it transmits the frame. is characterized in that transmission error control is not performed.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すパケット信号フレーム
の構成を示す図である。第１図において、伝送誤り制御
を行わないパケット信号は、開始のフラグ（以下Ｆ）１
．アドレスフィールド（以下Ａ）２．制御フィールド（
以下Ｃ〉３．情報フィールド（以下■）４．フレームチ
エツクシーケンス（以下ＦＣ３）５．終結のフラグ（以
下Ｆ）６から構成され、Ｃ３の“’１１１１０１１１”
（最下位桁がＭＳＢ）という値はＣＣＩＴＴ勧告Ｘ
。FIG. 1 is a diagram showing the structure of a packet signal frame showing an embodiment of the present invention. In Fig. 1, a packet signal without transmission error control has a start flag (hereinafter referred to as F) 1.
．． Address field (hereinafter referred to as A)2. Control field (
Below C〉3. Information field (hereinafter ■) 4. Frame check sequence (hereinafter referred to as FC3)5. Consists of 6 termination flags (F), C3 “'11110111”
(The least significant digit is MSB) value is CCITT Recommendation
.
２５、Ｘ、７５等では未定義である。25, X, 75, etc. are undefined.
第２図は第１図における伝送誤り制御の不要なパケット
信号を含むパケット信号フレーム受信時の動作を示す流
れ図である。まず最初にパケット信号フレームを受信す
るとそのＣを検査する。検査の結果、伝送誤りを許容す
るパケット信号の制御フィールド（すなわち“１１１１
０１１１” ＞ならば［誤り制御不要フレーム」受信と
判断し、伝送誤り検査を行わない。また検査の結果、伝
送誤りか許されないパケット信号と判断された場合は、
次に伝送誤り検査を受信パケット信号のＦｅ２を用いて
行う。伝送誤りがないならば正常フレーム受信と判断さ
れ、伝送誤りのある場合はその受信フレームは廃棄され
る。FIG. 2 is a flowchart showing the operation in FIG. 1 when a packet signal frame including a packet signal that does not require transmission error control is received. First, when a packet signal frame is received, its C is inspected. As a result of the inspection, the control field of the packet signal that tolerates transmission errors (i.e. “1111
0111''>, it is determined that an [error control unnecessary frame] has been received, and transmission error checking is not performed. In addition, if the inspection results determine that there is a transmission error or an unacceptable packet signal,
Next, a transmission error check is performed using Fe2 of the received packet signal. If there is no transmission error, it is determined that the frame has been received normally; if there is a transmission error, the received frame is discarded.
次に第３図は第１図における伝送誤り制御の不要なパケ
ット信号を含むパケット信号フレームの送信時の動作を
示す流れ図である。まず送信すべきパケット信号の種別
に応じて伝送誤り制御が必要かどうか判断する。伝送誤
り制御が不要ならばＣとして’１１１１０１１１”を付
加し、伝送誤り制御が必要ならば通常の制御フィールド
を付加する。そして、第１図に示すＡ、Ｆｅ２．Ｆ等を
付加して送信フレームを組み立てて送信する。Next, FIG. 3 is a flowchart showing the operation in FIG. 1 when transmitting a packet signal frame including a packet signal that does not require transmission error control. First, it is determined whether transmission error control is necessary depending on the type of packet signal to be transmitted. If transmission error control is not required, '11110111' is added as C, and if transmission error control is required, a normal control field is added. Then, A, Fe2.F, etc. shown in Figure 1 are added to the transmission frame. Assemble and send.
第４図は番号制情報フレームによって情報を伝送する際
に伝送誤りが発生し再送動作が発生した場合のパケット
信号伝送の様子を示すシーケンスチャートである。第４
図において、Ｉｌ、Ｉ２゜Ｉ３．〜と順番にデータを送
信している途中で、例えば１２に雑音が乗って伝送誤り
が発生すると、Ｉ２のパケットが廃棄され、次にＩ３の
パケット信号を受信したところで受信側はパケット信号
の飛越しを検出するので、ＲＥ Ｊフレームによって再
送を要求する。一方送化側では、ＲＥＪフレームを受信
した時点ではすでに１３に続いてＩ４を送信しており、
送信側の内部処理遅延分だけ遅れてＩ４に引続いて工２
を再度送信する。これ以降、Ｉ３．Ｉ４．〜と再送を行
う。この時受信側では、Ｉ３．Ｉ４は順番に合致しない
ので廃棄される。結局、伝送誤りが発生ずると再送デー
タが受信されるまで遅延が起こる。FIG. 4 is a sequence chart showing the state of packet signal transmission when a transmission error occurs and a retransmission operation occurs when transmitting information using a numbered information frame. Fourth
In the figure, Il, I2°I3. For example, if noise occurs in 12 and a transmission error occurs while data is being transmitted in order, the I2 packet will be discarded, and when the next packet I3 signal is received, the receiving side will skip the packet signal. Since it detects the error, it requests retransmission using an RE J frame. On the other hand, on the sending side, when receiving the REJ frame, it has already sent I4 following 13,
I4 is followed by I4 with a delay equal to the internal processing delay on the sending side.
Send again. From now on, I3. I4. ~ and retransmit. At this time, on the receiving side, I3. I4 does not match the order, so it is discarded. After all, when a transmission error occurs, a delay occurs until retransmitted data is received.
第５図は伝送誤りを無視するパケット信号を伝送する際
の動作を示すシーケンスチャートである。第５図におい
てＥｌ、Ｅ２．〜と順番にデータを送信している途中で
、例えばＥ２に伝送誤りが発生すると、データは正確に
は受信されないが、この伝送誤りを無視して次のＥ３．
Ｅ４．〜を正常に受信する。従って第４図に示したよう
に遅延は発生しない。FIG. 5 is a sequence chart showing the operation when transmitting a packet signal ignoring transmission errors. In FIG. 5, El, E2. For example, if a transmission error occurs in E2 while transmitting data in sequence, the data will not be received correctly, but this transmission error will be ignored and the next E3.
E4. ~ is successfully received. Therefore, no delay occurs as shown in FIG.
以上説明したように本発明は、従来定義されていない制
御フィールドの値の一つをあらあかしめ定めたビットパ
タンの制御フィールドにもつ情報フレームを定義し、伝
送誤り制御不要な情報のパケット信号フレームを伝送し
、パケット信号単位で伝送誤り制御を選択的に行うこと
により、伝送誤りの許されないデータのパケットと画像
や音声データのパケット信号等のような伝送誤りは許容
されるが実時間性の重要なパケット信号を混合して処理
する際に、後者の画像や音声データのパケット信号処理
の実時間性を高める効果がある。As explained above, the present invention defines an information frame having a control field with a predetermined bit pattern that is one of the values of a control field that has not been previously defined, and a packet signal frame of information that does not require transmission error control. By selectively performing transmission error control on a per-packet signal basis, transmission errors can be tolerated in data packets for which transmission errors cannot be tolerated, and in packet signals for image and audio data, but in real-time When important packet signals are mixed and processed, this has the effect of increasing the real-time performance of the latter packet signal processing of image and audio data.
第１図は本発明の一実施例例を示すパケット信号フレー
ムの構成を示す図、第２図は第１図における伝送誤り制
御の不要なパケット信号を含むパケット信号フレームの
受信時の動作を示す流れ図、第３図は第１図における伝
送誤り制御の不要なパケット信号フレームの送信時の動
作を示す流れ図、第４図は番号制情報フレームによって
情報を伝送する際に伝送誤りが発生し再送動作が発生し
た場合のパケット信号伝送の様子を示すシーケンスチャ
ート、第５図は伝送誤りを無視するパケット信号を伝送
する際の動作を示すシーケンスチャートである。
１．６・・・フラグ（Ｆ）、２・・・アドレスフィール
ド（Ａ）、３・・・制御フィールド（Ｃ）、４・・・情
報フィールド（Ｉ）、５・・・フレームチュックシーケ
ンス（Ｆｅ２）。FIG. 1 is a diagram showing the structure of a packet signal frame showing an example of an embodiment of the present invention, and FIG. 2 is a diagram showing the operation when receiving a packet signal frame including a packet signal that does not require transmission error control in FIG. 1. Flowchart: Figure 3 is a flowchart showing the operation when transmitting a packet signal frame that does not require transmission error control in Figure 1; Figure 4 is a flowchart showing the retransmission operation when a transmission error occurs when transmitting information using a numbered information frame. FIG. 5 is a sequence chart showing the state of packet signal transmission when a transmission error occurs. FIG. 5 is a sequence chart showing the operation when transmitting a packet signal ignoring transmission errors. 1.6... Flag (F), 2... Address field (A), 3... Control field (C), 4... Information field (I), 5... Frame check sequence (Fe2 ).
Claims (1)
制御フィールドに新たに定義したビットパタンを付加し
て送信し、受信側は前記フレームを受信したときはこの
フレームについては伝送誤り制御を行わないことを特徴
とするパケット信号伝送方式。The sending side adds a newly defined bit pattern to the control field of a frame that does not require transmission error control of packet signals and transmits it, and when the receiving side receives the frame, it must not perform transmission error control on this frame. A packet signal transmission method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33596787A JPH01175341A (en) | 1987-12-28 | 1987-12-28 | Packet signal transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33596787A JPH01175341A (en) | 1987-12-28 | 1987-12-28 | Packet signal transmitting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01175341A true JPH01175341A (en) | 1989-07-11 |
Family
ID=18294323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33596787A Pending JPH01175341A (en) | 1987-12-28 | 1987-12-28 | Packet signal transmitting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01175341A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021941A (en) * | 2007-07-13 | 2009-01-29 | Rohm Co Ltd | Information communication terminal, radio communication device, and radio communication network |
| JP2009033393A (en) * | 2007-07-26 | 2009-02-12 | Sumitomo Electric Ind Ltd | Decoder, decoding system, communication apparatus, repeated end condition setting device, data structure, and communication quality adjusting method |
| US8347160B2 (en) | 2007-07-13 | 2013-01-01 | Rohm Co., Ltd. | Information communication terminal, radio communication apparatus and radio communication network system capable of performing communication corresponding to purpose |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62105554A (en) * | 1985-11-01 | 1987-05-16 | Nippon Telegr & Teleph Corp <Ntt> | Packet error control system |
-
1987
- 1987-12-28 JP JP33596787A patent/JPH01175341A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62105554A (en) * | 1985-11-01 | 1987-05-16 | Nippon Telegr & Teleph Corp <Ntt> | Packet error control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021941A (en) * | 2007-07-13 | 2009-01-29 | Rohm Co Ltd | Information communication terminal, radio communication device, and radio communication network |
| US8347160B2 (en) | 2007-07-13 | 2013-01-01 | Rohm Co., Ltd. | Information communication terminal, radio communication apparatus and radio communication network system capable of performing communication corresponding to purpose |
| JP2009033393A (en) * | 2007-07-26 | 2009-02-12 | Sumitomo Electric Ind Ltd | Decoder, decoding system, communication apparatus, repeated end condition setting device, data structure, and communication quality adjusting method |
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