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This paper suggests an algorithm to improve QoS by using DTR bit employed in the MIL-STD-188-220 protocol, when there is a multi-path between source and destination in the environment of KVMF tactical network supporting NCW. The MIL-STD-188-220 protocol can evaluate the link quality relatively but it cannot support optimal path selection for QoS. In order to solve this problem, we design an algorithm for selecting path using topology table which reflects measured DTR of path after the completion of transmission. The performance of the proposed algorithm has been evaluated by OPNET simulator. As a result of the simulation, it is found that QoS of proposed algorithm is enhanced higher than that of the MIL-STD-188-220 in the aggravated communication environment. First Author :  2 , koohyung@add.re.kr,  *  2 ** ()  :KICS2013-08-373, :2013 8 30,  : 2013 10 28, :2014 2 4 I.     ·     (NCW : Network Centric Warfare)        ,     ,   (J-KICS) '14-02 Vol.39C No.02 140 ,     ·   .                    ·      .    ,          ,  NCW      (Korean Variable Message Format: KVMF)       2004      .     Ad-hoc   MIL-STD-188-220 FM       , OSI 7    3   (Internet Layer)     . MIL-STD-188-220                .             (QoS: Quality of Service)   . QoS   DTR(Delay, Throughput, Reliability)  , (Precedence)            QoS    .                QoS             .        MIL-STD-188-220     (Link Quality)           .      Link Quality  [5]          ,       .    2   Ad-Hoc   MIL-STD-188-220      , 3          .  4  . II.       Ad-Hoc   MIL-STD-188-220     ,    . 2.1   Ad-Hoc         C4I (Command, Control, Computer, Communication and Intelligence)      .                ,         .         ,      .               Ad-Hoc   NCW     .        Ad-Hoc                    .                                     . 2.2 MIL-STD-188-220  2.2.1                        .      1  .  2 Node Status Byte         (      )       . Node Status Byte LINK QUALITY           .         0 .          . HOP LENGTH      , NR   / KVMF    QoS   141 Link Quality Description 0 Unknown 1 Best Link 2 3 4 5 6 Worst Link 7 Static Node  1.     Table 1. Topology Link Quality Value  1.     Fig. 1. Topology Update Data Structure  2.    Fig. 2. Node Status Byte     / .   QUIET          . LINK QUALITY   7  ,  .        ,          .  1       . MIL-STD-188-220          .           .       ,            .       (shortest path)    .         1       .     (optional)   ,           . ,             . MIL-STD188-220              ,             .

QoS Enhancement Based on Link Quality in Tactical Data Link of KVMF