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1、第三層（Layer3）信令第三層信令是看網(wǎng)絡(luò)運(yùn)行情況的信息層，從第三層可以看到網(wǎng)絡(luò)的個(gè)利「動(dòng)作：如：呼叫流程、擁塞、用戶(hù)忙、位置更新等，系統(tǒng)信息總共冇8個(gè)類(lèi)型，Type1-4只出現(xiàn)在待機(jī)狀態(tài)卜Type5—8只出現(xiàn)在通話狀態(tài)21、SystemInformationType1■essa.geDetailsa「MSISystemInformationType1Time:18:25:49.36Latitude:N2312.3120Longitude:E11315.4710Speed:0.000000Framenumber:178304Readfrom(ARFCN
2、):86L2PseudoLength:21CellchanneldescriptionCellAllocationFormatnotation:Bitmap0ARFCN:192858748695RACHcontrolparametersMaxretransmissions:1Tx-integer:12Cellbaraccess:NotbarredCallreestablishment〔RE〕：NotallowedEmergencycall(EC)allowed:AllMSNotbarredclass(es)(ACC):012345678911121314
3、15SI1RestOctetscontainssparebitsMessagedump:0056550619000000004020020002000000080400002500002b小區(qū)廣播信息，有該小區(qū)自身的頻點(diǎn)，RACH的一些參數(shù)設(shè)置，祥見(jiàn)上圖。2、SystemInformationType2■essageDetailsMS1SystemInformationType2Time:14:08:32.60Latitude:N2312.3860Longitude:E11315.2610Speed:0.000000Framenumber:1913987
4、Readfrom(ARFCN):79L2PseudoLength:22NeighborcellsdescriptionBA-IND:1EXT-IND:0BCCHAllocationFormatnotation:Bitmap0ARFCN:24812147184869092NCCpermitted:252(AllowedNCC=251)RACHcontrolparametersMaxretransmissions:2Tx-integer:12Cellbaraccess:NotbarredCallreestablishment(RE):NotallowedEm
5、ergencycall(EC)allowed:AllMSNotbarredclass(es)(ACC):01234567891112131415待機(jī)模式下小區(qū)的測(cè)雖頻點(diǎn)，（同頻段，移動(dòng)網(wǎng)冇兩個(gè)頻段，GSM900和DCS1800）,在通話模式下有另外定義的測(cè)量頻點(diǎn)，也就是說(shuō)一個(gè)小區(qū)可以在待機(jī)吋做測(cè)量頻點(diǎn)，而通話時(shí)不做測(cè)量頻點(diǎn)，允許小區(qū)重選而不允許切換，反之也可以只允許切換不允許小區(qū)重選也可以，不過(guò)通常情況卜-待機(jī)和通話時(shí)的測(cè)量頻點(diǎn)是一致的。3、SystemInformationType2ter■essageDetailsMS1SystemInformati
6、onType2terTime:14:08:31.65Latitude:N2312.3860Longitude:E11315.2610Speed:0.000000Framenumber:1913783Readfrom(ARFCN):79L2PseudoLength:0Neighborcellsdescription2Multibandreporting:3BA-IND:1BCCHAllocationFormatnotation:VariablebitmapARFCN:514539545552554556SI2terRestOctetscontainsspa
7、rebits待機(jī)模式下小區(qū)的測(cè)雖頻點(diǎn)，（異頻段，移動(dòng)網(wǎng)冇兩個(gè)頻段，GSM900和DCS1800）,4、SystemInformationType3■essageDetailsMS1SystemInformationType3Time:14:08:31.89Latitude:N2312.3860Longitude:E11315.2610Speed:0.000000Framenumber:1913834Readfrom(ARFCN):79L2PseudoLength:18CellIdentity:33281(8201hex)Locationareaident
8、ificationMobilecountrycode(MCC):460Mobil
