各課程學(xué)習(xí)通信網(wǎng)理論基礎(chǔ)-netheory nettheory

1、傳輸控制交換與路由控制接納控制管理面管理面管理面面管用戶(hù)面層理管理AAL ATM層物理層AALATM層物理層面用戶(hù)控面制用面戶(hù)控面制面控制Cp1F(1-p)p2Ap: 正確概率，1- p: 出錯(cuò)概率 = p + 2(1-p)p + 3(1-p)2p = 1/pCH1.addressFH2.addressAH3.addressA到H1Address H1.addressH1到AAddress H1.addressPollAFinalMax (N) = 7Max (N) = 127AReceive Ready (RR) Receive Not Ready (RNR)Reject (REJ)Sele

2、ctive Reject (SREJ)N(S)01234567A+1+1+1+10011110100000FullAddressEmptyAHead = TailHead =0Head = TailHead ：第一個(gè)待讀地址Tail = 1Tail：第一個(gè)可存入地址Frame 0Frame 1Frame 2Frame 3Frame 4Frame 5Frame 6Frame 7Frame 0000001010011100101110111停止發(fā)送N(S)0123456AN-07N(S)01234567A1N(R)0w = 2N(S)012345670A121w = 7w = 6w = 0w =

3、2AFrame 2Frame 3Frame 4Frame 5Frame 6Frame 0Frame 1Frame 2Frame 3Frame 4Frame 5Frame 6Frame 0N(S)01234N23A12N22N(S)01234N25A12201234Atp = len/c = 1000 m/2*108tf = size/bwm/s = 5us= (1000+48 bit)/9600 b/s = 109 ms= 48 bit/9600 b/s = 5 mslensizeW301234Ata = 2tp + tf+ tf = 114 mstp = len/c = 1000 m/2*1

4、08 m/s = 5ustf = size/bw= (1000+48 bit)/9600 b/s = 109 ms= 48 bit/9600 b/s = 5 ms同步軌道？W301234Ata = 2tp + tf= 839 ms= 7.7ftp = len/c = 2*36000 km/2*108 m/s= 360 ms= (1000+48 bit)/9600 b/s = 109 mstfWindow s ze W,ransmisime = 1,propagation time = aCase 1: W = 2a + 1Sender A cat amcontinuous y wh nopau

5、se and normalized throughput is 1.0Case 2: W N(S) ACKN-N RWIN明示對(duì)方，原因是什么？Prob. 與HDLC一致？SYNSYN+ACKACKSYNSYN+ACKACKringingwaitingpick- upEC311F261D3A4B時(shí)序一幀16個(gè)數(shù)字間隔50ms錄波結(jié)果基于DTMF的狀態(tài)上報(bào) DTMF原始波形 經(jīng)PCMA編碼VoIP傳送后恢復(fù)的波形 經(jīng)SPEEX編碼VoIP傳送后恢復(fù)的波形FXS/FXOFXS/FXO上行通道TDM傳輸PCCR下行通道CCIP cloudNGN傳輸：P: PanelR: ReceiverIAD：eg

6、rated Acs DeviceSG：Signaling Gateway MG：Media GatewayIADIADSGSGMGMG傳輸控制交換與路由控制接納控制EC3H211F261D3H1A4BA收到來(lái)自H1、去往H2的IP分組，向B、E、F三個(gè)節(jié)點(diǎn)的哪個(gè)轉(zhuǎn)發(fā)？C向D、F通告，到H2的距離權(quán)值為0F向A、B、E通告，到H2的距離權(quán)值為1E通告A，到H2的距離權(quán)值為4； B通告A，到H2的距離權(quán)值為2A計(jì)算，經(jīng)B到H2的距離權(quán)值為6；經(jīng)E到H2的距離權(quán)值為5；經(jīng)F到H2的距離權(quán)值為7EC311F261D3H1A4B192.168.4.x/22192.168.6.X/24. .192.168

7、.5.x192.168.6.xProb. 目標(biāo)地址為R128./101 2叉樹(shù)查找，復(fù)雜度為O(log2N)127./1192.168.4.x/22 Prob. O(1)的查詢(xún)方法？ 192.168.6.x/23簡(jiǎn)單鏈表查找，復(fù)雜度為O(N)Lookup目標(biāo)地址為分組192.168.4.x/22192.168.6.X/23前綴數(shù)為NEC311F261D3A4B管理面管理面管理面HTTPRIP面管理用戶(hù)面用戶(hù)控面制用面戶(hù)控面制面控制面層管TDPIP NIFUDPIPTCP/UDP IP網(wǎng)絡(luò)接口理NIFOSPF/ISIS/BGP/LDP/RSVPDHCPDNSNATCDNMG/SGMIPHIP/L

8、ISPBAS/BRAS傳輸控制交換與路由控制接納控制蹭網(wǎng)者(Free Rider)目標(biāo)：POTS接入控制終端無(wú)計(jì)算處理功能，控制極易完成IP接入認(rèn)證()上網(wǎng)BAS/BRASExtee Authentication Protocol)VoIP呼叫接納控制面向QoS保障認(rèn)證方EAPoR/ CHAP/認(rèn)證提供認(rèn)證方PAP的服務(wù)PAE受控端口不受控端口EAPoLLANPAE: Port Acs EntityProb. 抗能力CHAP: Challenge-Handshake Authentication Protocol PAP: Password Authentication ProtocolEAP

9、oR: EAP over RADIUS認(rèn)證服務(wù)器請(qǐng)求者請(qǐng)求者 PAE僅對(duì)VoIP的業(yè)務(wù)流，不影響普通數(shù)據(jù)業(yè)務(wù)對(duì)實(shí)時(shí)性或時(shí)延敏感的業(yè)務(wù)，依據(jù)網(wǎng)絡(luò)負(fù)載情況接收到呼叫 無(wú)CAC的VoIP 有CAC的VoIPht/c/en/us/td/docs/ios/solutions_docs/voip_solutions/CAC.pdf本地決策依據(jù)歷史經(jīng)驗(yàn)，設(shè)置固定的允許呼叫的上限；基于測(cè)量的決策發(fā)啟方通過(guò)測(cè)量到達(dá)目標(biāo)節(jié)點(diǎn)的丟失率和延時(shí)，決定呼叫的接續(xù)與否；基于資源的決策計(jì)算所需與可用的資源，或者執(zhí)行資源預(yù)留操作，再?zèng)Q定呼叫的接續(xù)與否。98%以上的接通率？ MOS 4.5語(yǔ)音質(zhì)量？Prob. 保障與POTS相同等級(jí)的QoS小區(qū)內(nèi)因信道pb小區(qū)間切換因信道導(dǎo)致的呼叫導(dǎo)致的掉話pf多次切換導(dǎo)致的掉話通話完成的概率Ghaderi, Majid, and Raouf Boutaba. Call admiscontrolobile cellular networks: a comprehensive survey. Wireless communications and mobile computing 6.1 (20