H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/95
H04L 29/06 (2006.01) H04L 12/413 (2006.01) H04L 12/56 (2006.01)
Patent
CA 1336987
A communication control method for use in a communication system including a plurality of communi- cation control apparatuses interconnected through an information transmission path, each of the communication control apparatuses comprising a packet transmission/ reception unit, a timer unit and a controller, operates to prevent occurrence of such a situation that, when a first communication control apparatus undergoes accidental power-off or a failure of power supply or the like caused by some reason in the course of communication with a second communication control apparatus, which has been brought into a locked state by the first communication control apparatus, so that the first communication control apparatus has become unable to perform communication, the second communication control apparatus is left permanently in the locked state thereof. In that case, the second communication control apparatus transmits a lock confirmation packet to the first communication control apparatus to make lock confirmation as to whether the locked state is to be maintained, when the second communication control apparatus does not receive any communication packet from the first communication control apparatus for a predetermined period of time. When any reply to the lock confirmation is not received or alterna- tively an unlock authorization packet is received by the second communication control apparatus, the second communication control apparatus releases itself from the locked state thereof.
612110
Hase Yukiko
Ikezaki Masao
Sasanuma Hiroshi
Tanaka Shotaro
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
N.v. Philips Gloeilampenfabrieken
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