Tài liệu GSM Switching, Services and Protocols P7 ppt

... the air interface in the ISDN reference model GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian Bettstetter Copyright q 2001 John ... Call Control (CC), Supplementary Services (SS), and Short Message Service (SMS). Call control handles all tasks related to setting up, maintaining and taking down calls. The serv...

Ngày tải lên: 20/01/2014, 23:20

... Supplementary services are complementing the control and modi®cation of extended services and are only usable in connection with a telecommuni- cation service. 4 Figure 4.1: Bearer and teleservices GSM Switching, ... terminals tied to telephone lines. GSM services are therefore divided just like ISDN services into three categories: bearer services, teleservices, and sup...

Ngày tải lên: 23/12/2013, 17:15

... ITU-T standard 9.7 Teleservices: Fax 227 Figure 9.16: Fax adapter in GSM Figure 9.17: Overview of GSM procedure for fax service Data Communication and Networking 9.1 Reference Con®guration GSM was ... transcoding in the TRAU. From the MSC on, the speech 9 GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian Betts...

Ngày tải lên: 20/01/2014, 23:20

... selection in multiband networks with different frequencies becomes possible. 12 GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian Bettstetter Copyright ... writing. 12.3 Bearer and Teleservices of GSM Phase 21 Whereas GSM Phase 2 de®ned essentially a set of new supplementary services, Phase 21 is also addressin...

Ngày tải lên: 20/01/2014, 23:20

... Supplementary services are complementing the control and modi®cation of extended services and are only usable in connection with a telecommuni- cation service. 4 Figure 4.1: Bearer and teleservices GSM Switching, ... terminals tied to telephone lines. GSM services are therefore divided just like ISDN services into three categories: bearer services, teleservices, and sup...

Ngày tải lên: 26/01/2014, 12:20

... currently staying and has access to the network. There, the same communication services can be used as at home, limited only by the properties of the 1 GSM Switching, Services and Protocols: Second ... characteristics and the cellular principle. The understanding of duplex and multi- ple access schemes serves as the basis for understanding GSM technology. Chapter 3 introduc...

Ngày tải lên: 23/12/2013, 17:15

... Simpli®ed two-path model of radio propagation GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian Bettstetter Copyright q 2001 John ... multiple of its original bandwidth. Typically, spreading factors are between 10 and 1000; they generate a broadband signal for transmission from the narrowband signal, and this is l...

Ngày tải lên: 23/12/2013, 17:15

... network (e.g. the Integrated Services Digital Network,ISDN [7]) are handled by a dedicated Gateway 3 Figure 3.1: GSM system hierarchy GSM Switching, Services and Protocols: Second Edition. Jo È rg ... authentication and user data encryp- tion based on the subscriber identity IMSI and secret keys. Beyond that,the SIM can store short messages and charging information ,and it...

Ngày tải lên: 23/12/2013, 17:15

... connection that is specially treated according to 5 GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian Bettstetter Copyright q 2001 John ... inputs for the handover and power control algorithms. The measurement objects are on the one hand the uplink and downlink of the current channel (TCH or SDCCH), and on the o...

Ngày tải lên: 20/01/2014, 23:20

... elements of GSM transmission chain on the physical layer at the air interface GSM Switching, Services and Protocols: Second Edition. Jo È rg Eberspa È cher, Hans-Jo È rg Vo È gel and Christian ... security and data protection, are gaining enormous importance in modern digital systems [17]. GSM therefore introduced powerful algorithms and encryp- tion techniques. The various...

Ngày tải lên: 20/01/2014, 23:20