1746-OV16
1746-OV16
載波偵聽會(huì)阻止相互干擾范圍內(nèi)兩個(gè)節(jié)點(diǎn)同時(shí)傳輸。節(jié)點(diǎn)傳輸速率會(huì)隨著同時(shí)開始廣播連續(xù)數(shù)據(jù)包的節(jié)點(diǎn)增多,逐漸低于單獨(dú)傳播速率。據(jù)此可通過廣播速率判斷兩節(jié)點(diǎn)是否處于相互干擾范圍內(nèi)。
HELLO消息包含當(dāng)前負(fù)載信息。每個(gè)節(jié)點(diǎn)保存一張記錄其鄰居節(jié)點(diǎn)及其負(fù)載的表。當(dāng)一個(gè)節(jié)點(diǎn)接收到從鄰居節(jié)點(diǎn)發(fā)來的HELLO消息,它將與鄰居表進(jìn)行核查。若該鄰居已經(jīng)在表中,則更新其負(fù)載,否則將該鄰居加入鄰居表內(nèi)。如果一個(gè)節(jié)點(diǎn)從一個(gè)鄰居節(jié)點(diǎn)接收3個(gè)連續(xù)HELLO消息失敗,將會(huì)從鄰居表內(nèi)把該鄰居節(jié)點(diǎn)移除。這樣,就可以用鄰居表中的負(fù)載信息來計(jì)算干擾鄰居的負(fù)載,同時(shí)獲得節(jié)點(diǎn)自身的負(fù)載。
5 性能仿真與結(jié)果分析
本文采用NS2[10]仿真工具進(jìn)行仿真實(shí)驗(yàn),將ILA和MIC作為比較,對(duì)LBIA性能進(jìn)行驗(yàn)證。將NS2模塊進(jìn)行擴(kuò)展,以支持多信道多接口和改進(jìn)的AODV路由協(xié)議。
5.1 仿真場景和參數(shù)設(shè)置
用于NS2仿真的場景參數(shù)設(shè)置如表1所示。
:歐工
:
:
:
:
REXROTH INDRAMAT 256108 SPINDLE DRIVE
REXROTH INDRAMAT 256365 MODULE WITH FIBER OPTIC CONNECTORS
REXROTH INDRAMAT 256450 256450 CTA 03.1B-DLC
REXROTH INDRAMAT 256985 PC BOARD
REXROTH INDRAMAT 257140 AC SERVO POWER SUPPLY
REXROTH INDRAMAT 257326 PROCESSOR MODULE
REXROTH INDRAMAT 257328 AXIS PROCESSOR MODULE
REXROTH INDRAMAT 260465 SERVO MOTOR
REXROTH INDRAMAT 263529 MOTOR
REXROTH INDRAMAT 265340 SERVO CONTROL
REXROTH INDRAMAT 265406 UNIT
REXROTH INDRAMAT 266805 SERVO CONTROL
REXROTH INDRAMAT 267341 PC BOARD
REXROTH INDRAMAT 268887 CONTROL
REXROTH INDRAMAT 268889 CONTROL
REXROTH INDRAMAT 271426 ELEC COMPONENT
REXROTH INDRAMAT 271639 ENCODER
REXROTH INDRAMAT 276889 CONNECTOR
REXROTH INDRAMAT 276890 CONNECTOR
REXROTH INDRAMAT 277697 CABLE
REXROTH INDRAMAT 278760 FIRMWARE MOD
REXROTH INDRAMAT 278984 CABLE
REXROTH INDRAMAT 284830 SERVO MOTOR
REXROTH INDRAMAT 285402 CARD DISPLAY
REXROTH INDRAMAT 2AD160B-B35OB2-BS03-C2N1 MOTOR 460VAC 30KW 1.5-6K RPM
REXROTH INDRAMAT 2AD160CB350B1BS0 SERVO
REXROTH INDRAMAT 2G-1125-1R-B3-3302-H2 SERVO MOTOR
REXROTH INDRAMAT 308241 FIB OPTIC MOD
REXROTH INDRAMAT 308248 FIB OPTIC MOD
REXROTH INDRAMAT 31220901 ENCODER
REXROTH INDRAMAT 610085 CONNECTOR KIT/CABLE
REXROTH INDRAMAT 610110 CONNECTOR KIT/CABLE
REXROTH INDRAMAT 610121 CONNECTOR KIT/CABLE
REXROTH INDRAMAT 610123 CONNECTOR KIT/CABLE
REXROTH INDRAMAT A2D300AD0201 FAN ASSEMBLY 230/400V 280/270W 2650/2800RPM
REXROTH INDRAMAT AC-SERVO Item