Method and apparatus for auto-adapting a retry timer to avoid de

Details Method and apparatus for auto-adapting a retry timer to avoid de Method and apparatus for auto-adapting a retry timer to avoid de

1997-02-19

2000-01-04

Pham, Chi H.

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

370252, 370412, 370350, G01R 3108, G06F 1100, G08C 1500, H04L 1228

Patent

active

060118059

ABSTRACT:
To assure a complete transmission of frames in communication protocol such as the X25 LAPB a timer is used. The integrity of the transmission is obtained by retransmitting Iframe that are not received. Thus, each frame that is sent is controlled by a timer, called Retry Timer or T1 Timer. A short T1 Timer may cause a de-synchronization of the protocol then a connection loss. The invention aims to avoid this problem. The principle is based on the fact that the T1 Timer value is defined not only according to the speed but also to the workload of the LINK (51). The invention aims to add automatically to the initial value of the T1 Timer a queue delay. This queue delay corresponds to the delay between the enqueue of a buffer pointer (11) and the transmission of this buffer (41) on the Link. Thus, T1 Timer becomes auto-adaptive. The invention consists in performing two actions. The first action is to measure dynamically the queue delay. For this purpose, a transmit scheduler (40) sets a marker (46) in a transmit queue (30). When the transmit scheduler dequeues this marker, it updates the Queue delay in a register (60) and re-enqueues the marker. The second action is to adapt dynamically the T1 Timer. After sending a frame, if the T1 Timer expires without reception of an acknowledgment, then T1 timer is started with another value corresponding the queue delay measured above. And if the timer expires again then the LAPB (10) starts a confirmation mechanism in order to retransmit the Iframe that is not received.

REFERENCES:
patent: 5042032 (1991-08-01), Dighe et al.
patent: 5548533 (1996-08-01), Gao et al.
patent: 5754754 (1998-05-01), Dudley et al.

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