JPH03237829A - Notifying method for missing frame in hdlc procedure - Google Patents

Abstract

PURPOSE:To compress an information part and to save an information part reception buffer of a notice opposite party by representing a sequence number of a missing I frame in 1-bit. CONSTITUTION:A sequence number information area 2 and a reception state information area 3 are formed in a missing I frame notice frame. When missing of an I frame is detected at the reception side of the I frame, the youngest sequence number in the sequence number of the missing I frame is set to the sequence number information area 2 of the missing 1 frame notice frame. The reception state information representing the state of the reception of the I frame after the youngest sequence number in 1 bit as to one I frame is generated and set to the reception state information area 3 and the missing I frame notice frame is sent to the sender side. Thus, the information part reception buffer of the noticed side is saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for notifying a lost frame in an HDLC procedure, and more particularly to a method for notifying when a plurality of frames are lost in a data transfer system using an HDLC procedure.

[Conventional technology]

Conventionally, as a method for notifying multiple lost e-frames in the HDLC procedure, the meaning of expedited delivery confirmation up to N(R)-1 by reception order number N (R) was used using MN-3REJ frames as shown in Figure 3. and the sequence number N of multiple error frames
There was a method to notify (Xl) to N (X, ).

[Problem to be solved by the invention]

The conventional method of notifying a lost Eframe using the MN-8REJ frame described above uses the sequence number as is, so
l For each lost frame, there will be 7 bits of information for modulo 128, and 3 bits of information for modulo 8, and if there are many lost frames, the M N-8RE of the side to be notified will be
, JF)/-M has the disadvantage of requiring a buffer for receiving the information section.

[First and second steps to solve problem P] The method of notifying a lost I frame 1/- in the HD LC procedure of the present invention is to
)/- Regarding the notification method of lost frames in the day/evening transfer method that sends and receives hems, the lost frame notification frame 17
・The system is configured to include a sequence number information area and a receipt information area, and at least one I/-me is lost on the receiving side of the plurality of consecutive I/-me. When the missing frame is detected, the smallest sequence number among the sequence numbers of the lost frame is set in the sequence number information area of the lost frame notification frame 1 to 1. I-Fre after the number
- Receipt or non-reception status of the frame] 1 piece per frame] Create reception status information and set it in the reception status information area j2, the lost frame notification frame the transmitting side 6 of the plurality of consecutive I nodes;
- It is the sending tree.

〔Example〕

Next, the present invention (7, "Explained with reference to the drawings 1-7")
Do 1.

Figure 1 is a diagram for explaining one embodiment of the present invention.
It is a diagram.

The I-I DLC procedure (17 data transfer 22 is performed between the two devices).
Second, the information management area that manages the I-Frame-9 communication status information, that is, the manager and the rear.
0” (Step 10). ■ When receiving the F) Norm (Step 11), the 9 received I F Norm)
Faith 1 stubborn order number 〢N (S), l faith state variable ■ (R)) -
Compare 1. <Step 12), Match 1. If so, the receiving state variable V(R,) of the managing helium is 4.7 and the corresponding position (
, 2° "1 set l ~ (Step) 3), if there is a mismatch, the bond P management state variable of transmission order number N (S) ■ (R,)
” (step 14).

Next, add "]" to the reception state variable V (R,). <Step 15), reception state variable V after addition
If (R,) reaches a predetermined number j2f'):, it is determined that step 16), and the predetermined number j, C inage tr- is reached, the above steps from reception of the above-mentioned I frame (Zublag 11>) are repeated.

Predetermined number (:l 1. Search for Management-Alias 1
1-7 (step i7), 1-7 (step i7), 1-7 (step i7), 1-7 (step i7) If "0" is not lost, 41- f+- only 1 node)/- is received normally - C' is recognized as 0 and Lfi is not filled in. '0' is left behind, If #14, it is recognized that the I frame 1 norm has not been received (there is an error, so it will be discarded), and a frame to notify the missing frame will be created. Start.

The second screen shows the format of the frame for notifying the lost frame. )
/ - frame type setting frame I / - frame: i = do part 1;
1. A sequence number information section 2 that sets the reception order #"J-N (R,) without indicating the acceptance of consecutive FMs up to the previous sequence number; and a sequence number information section 2. It consists of a receiving status information section 3 that sets the 9f3 status for each frame of the ■ frame after the order number.The configuration of the receiving status information section 3 is as follows. I7 in the ascending direction of the pitch position
1/-mu's reception (transmission) sequence number corresponds to l-4 content X
For example, when l""-Xn is 1", it indicates that a ■ frame has been received, and when it is "o", it indicates that an I frame has not been received.

Detection of “Pa 0” in management area 1-?: Lowest number digit 2 t
, :.

Receiving order number 9~
N (R) and 1 to 1 are set in the sequence number information field 2. (Step 8), the reception status information unit 3
(one step). When the creation of the frame to notify the lost I-frame) is completed, the destination device (the sending side of the I-frame) (,7 pairs!) is sent (Step 2
0).

In addition, other processing is performed in the same manner as before.
: ε is possible.

〔Effect of the invention〕

As explained above, the present invention has the effect of compressing the information part by representing the sequence number of the lost I frame with 1 bit, and reducing the buffer for receiving the information part on the notification destination side.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining an embodiment of the present invention, Fig. 2 is a format diagram of a frame for notifying a lost I frame according to an embodiment of the present invention, and Fig. 3 is a conventional diagram for notifying a lost I frame. FIG. 12 is a format diagram showing an example of a frame. 1...Frame code section, 2...Sequence number information section,
3...Reception status information section.

Claims (1)

[Claims] In a method for notifying a lost frame in a data transfer method that transmits and receives a plurality of consecutive I frames using an HDLC procedure, a lost I frame notification frame is configured to include a sequence number information area and a reception status information area, and When the receiving end of at least one I frame detects the loss of at least one I frame, it sets the lowest sequence number among the sequence numbers of the lost I frame in the sequence number information area of the lost I frame notification frame, and Receiving status information that indicates the reception or non-reception status of I-frames after the smallest sequence number is created and set in the reception status information area, and the received status information is set in the reception status information area, and the lost I-frame notification frame is sent to the consecutive plurality of I-frame notification frames. A method for notifying a lost frame in an HDLC procedure, the method comprising: transmitting a lost frame to an I frame transmitting side of the HDLC procedure.