层三信令分析

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1、第三层（Layer3）信令第三层信令是看网络运行情况的信息层，从第三层可以看到网络的个利「动作：如：呼叫流程、拥塞、用户忙、位置更新等，系统信息总共冇8个类型，Type1-4只出现在待机状态卜Type5—8只出现在通话状态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小区广播信息，有该小区自身的频点，RACH的一些参数设置，祥见上图。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待机模式下小区的测虽频点，（同频段，移动网冇两个频段，GSM900和DCS1800）,在通话模式下有另外定义的测量频点，也就是说一个小区可以在待机吋做测量频点，而通话时不做测量频点，允许小区重选而不允许切换，反之也可以只允许切换不允许小区重选也可以，不过通常情况卜-待机和通话时的测量频点是一致的。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待机模式下小区的测虽频点，（异频段，移动网冇两个频段，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