57. L3消息格式Flag01111110Flag0111111016 BitsCRCInformationN - BitsControlAddress16 Bits8 or 16 BitsMessage Discriminator12345678Octet 1Octet 2Octet nEMMessage TypeInformation Elements87654312Fixed Length Info. Element FormatInformation Element IdentifierLength of Information ElementsContent of Information ElementsVariable Length Info. Element FormatTInformation Element IdentifierContent of Information ElementsT:EM==0: Non-transparent message Extension bit (future use)Message Discriminator01468OtherReservedRadio Link ManagementDedicated Channel ManagementCommon Channel ManagementTransceiver ManagementReserved for Future Use http://www.5ixue.com (海量营销管理培训资料下载)
58. 消息鉴别器消息鉴别
1:无线链路管理
4:专用信道管理
6:公共信道管理
8:TRX管理
T
指示消息是否为透明消息
EM
备用T:EM==0: Non-transparent message Extension bit (future use)Message Discriminator01468OtherReservedRadio Link ManagementDedicated Channel ManagementCommon Channel ManagementTransceiver ManagementReserved for Future Use http://www.5ixue.com (海量营销管理培训资料下载)
59. 无线链路管理功能
与BSC间传递有关无线链路的通信状态
建立、释放、错误指示
EST REQ、EST IND、ERR IND、REL REQ、REL IND等
或利用无线链路传递L3消息
DATA REQ、DATA IND等
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65. 透明消息的传递利用无线链路的数据传递功能,L3消息可以在BTS中透明传输。BTSBSCDATA INDicationDATA REQuestBTSBSCUNIT DATA INDicationUNIT DATA REQuesthttp://www.5ixue.com (海量营销管理培训资料下载)
66. Flag01111110Flag0111111016 BitsCRCInformationN - BitsControlAddress16 Bits8 or 16 BitsMessage Discriminator12345678Octet 1Octet 2Octet nEMMessage TypeChannel NumberTMessage Discriminator := 1 (Radio Link Management)L3 InformationProtocolDiscriminator0Message TypeInformation ElementsProtocol Discriminator35691115Call control, packet, suppl. serviceMobility managementRadio resources managementShort message servicesNon call related suppl. servicesReserved for test proceduresOtherReserved for future useT := 1 (transparent message)TIFlagTIValueTransaction IdentifierTI-flag := 0 Message is sent from the TI-originating sideTI-flag := 1 Message is sent to the TI-originating sideTI-value := 0-7 ReferenceInformation Elements透明的L3消息格式
71. A接口消息格式(图)FB
I
BBSNFSNF
I
BLISIOLabelSIFCKFDestination
point codeOriginating
point codeSLSSCCP user dataMessage
typeMandatory fixed partMandatory variable partOptional part业务信息字节http://www.5ixue.com (海量营销管理培训资料下载)
72. 业务信息字节(SIO)用于执行消息分配。
业务指示:(SI)4比特
SI编码
D C B A Indication
0 0 0 0 信令网络管理 (SNM).
0 0 0 1 信令网络测试 (SNT).
0 0 1 0 Spare
0 0 1 1 信令连击控制 (SCCP).
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75. 信令网络测试功能
发起测试的信令点传送的测试消息到对端
测试消息包括固定码型、信令链路选择、DPC、OPC
等待对方回送同样消息作为应答
编码
D C B A Meaning
0 0 0 1 (SLTM) Signalling link test message
0 0 1 0 (SLTA) Signalling link test acknowledgement message
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99. System information type 2
空闲模式下与服务小区同频段的邻小区频点集;
System information type 2ter
空闲模式下与服务小区不同频段的邻小区频点集
System information type 5
专用模式下与服务小区同频段的邻小区频点集;
System information type 5ter
专用模式下与服务小区不同频段的邻小区频点集
UM口http://www.5ixue.com (海量营销管理培训资料下载)