To reduce management burden of a counter in each node and communication traffic required for resynchronization of a count value.SOLUTION: In a management node (10k), an upper count value holding unit (11k) holds an upper count value, an upper count value distribution unit (143) updates the upper count value according to upper update conditions, and the updated upper count value is distributed to a normal node. In the normal nodes (10n, 10k), count value holding units (11n, 11k) hold the count value, lower update units (141:S210 to S220, 142:S400 to S470) update the lower count value held by the count value holding units according to lower update conditions, upper update units (142:S310 to S390, S410 to S440), by the upper count value distributed from the management node, updates the upper count value held by the count value holding unit and resets the lower count value.SELECTED DRAWING: Figure 1

    【課題】各ノードにおけるカウンタの管理負担、およびカウント値の再同期に要する通信トラフィックを軽減する。【解決手段】管理ノード(10k)では、上位カウント値保持部(11k)が上位カウント値を保持し、上位カウント値配信部(143)が、上位更新条件に従って上位カウント値を更新し、更新後の上位カウント値を通常ノードに配信する。通常ノード(10n,10k)では、カウント値保持部(11n,11k)がカウント値を保持し、下位更新部(141:S210〜S220,142:S400〜S470)が、下位更新条件に従ってカウント値保持部が保持する下位カウント値を更新し、上位更新部(142:S310〜S390,S410〜S440)が、管理ノードから配信された上位カウント値により、カウント値保持部が保持する上位カウント値を更新しかつ下位カウント値をリセットする。【選択図】図1


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    Title :

    COMMUNICATION SYSTEM, MANAGEMENT NODE, NORMAL NODE, COUNTER SYNCHRONIZATION METHOD, COUNT VALUE DISTRIBUTION METHOD, COUNT VALUE INITIALIZATION METHOD, PROGRAM, AND RECORDING MEDIUM


    Additional title:

    通信システム、管理ノード、通常ノード、カウンタ同期方法、カウント値配信方法、カウント値初期化方法、プログラム、記録媒体


    Contributors:

    Publication date :

    2019-09-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G09C Ver- oder Entschlüsselungsgeräte für Geheimschrift oder andere Zwecke, bei denen Geheimhaltung erforderlich ist , CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY



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