GSM switching services and protocals 2nd

... security and data protection, are gaining enormous importance in modern digital systems [17] GSM therefore introduced powerful algorithms and encryption techniques The various services and functions ... can calculate a set of (RAND, SRES) 2tuples in advance, store them in the HLR, and send them on demand to the requesting VLR The VLR stores this set (RAND[n], SRES[n]) and uses a...

Ngày tải lên: 17/10/2013, 21:15

... failure DCCH MS ! N 00101111 Handover access DCCH MS ! N ± Handover command DCCH N ! MS 00101011 Handover complete DCCH MS ! N 00101100 Ciphering Handover Message Handover failure Channel release ... encryption and decryption on the data channel The RR sublayer provides several services at the RR-SAP to the MM sublayer These services are needed to set up and take down signaling connec...

Ngày tải lên: 20/10/2013, 15:15

... categories: ² Handover because of more favorable path loss conditions ² Mandatory intercell handover ² Mandatory intracell handover 200 Roaming and Switching Table 8.1 Threshold values for the GSM handover ... the handover decision algorithm is changed in all or parts of the network Even though the GSM standard does not prescribe a mandatory handover decision algorithm, a simple 198 R...

Ngày tải lên: 20/10/2013, 15:15

... a network transition switching unit and carried as a voiceband signal in the PSTN to the analog terminal After these introductory remarks, the GSM data and teleservices and their realization ... Communication and Networking Figure 9.1: GSM reference con®guration signals in GSM networks are transported in standard ISDN format with a bit rate of 64 kbit/s In comparison, realizin...

Ngày tải lên: 24/10/2013, 13:15

... supply probability, and availability, and it can also be characterized with nontechnical criteria like ease of operation and comfort of subscriber access or even hot-line and support services Considering ... response times, etc.), and utilization of network components (hardware and software) The objective is on one hand to ensure a good utilization of resources and on the othe...

Ngày tải lên: 24/10/2013, 13:15

... Switched and Circuit Switched Services In a GSM/ GPRS network, conventional circuit switched services (GSM speech, data, and SMS) and GPRS services can be used in parallel The GPRS standard de®nes ... additional non-standardized services Examples are access to information databases, messaging services (via store -and- forward mailboxes), and transaction services (e.g cre...

Ngày tải lên: 28/10/2013, 20:15

... 12 GSM ± The Story Goes On Overview of GSM Services in Phase 21 GSM is not a closed system that does not undergo any change The GSM standards are being enhanced; and in the current phase of standardization ... writing 12.3 Bearer and Teleservices of GSM Phase 21 Whereas GSM Phase de®ned essentially a set of new supplementary services, Phase 21 is also addressing new bearer...

Ngày tải lên: 28/10/2013, 20:15

... Broadcast (DAB) and Digital Video Broadcast (DVB), are very interesting for wireless transmission of radio and television stations as well as for audio- and video-on-demand and broadband transmission ... Hong Kong, and New Zealand Afterward, GSM has also been introduced in Brunei, Cameroon, Iran, South Africa, Syria, Thailand, USA and United Arab Emirates Whereas the majority of...

Ngày tải lên: 23/12/2013, 17:15

... systems and is also used in digital systems For the communication between mobile and base station, the available frequency band is split into two partial bands, to enable simultaneous sending and ... system bandwidth for a time slot is not assigned to one station, but the system frequency range is subdivided into subbands, and TDMA is used for multiple access to each subband The subba...

Ngày tải lên: 23/12/2013, 17:15

... authentication and user data encryption based on the subscriber identity IMSI and secret keys Beyond that, the SIM can store short messages and charging information, and it has a telephone book function and ... Components of the GSM OMSS 40 System Architecture and Addressing 3.3.4.2 User Authentication and Equipment Registration Two additional databases are de®ned in GSM bes...

Ngày tải lên: 23/12/2013, 17:15

... nonspeech services (e.g BS26) and an extended range of supplementary services E3 1996 Enhanced service range with even more telecommunication and supplementary services 4.1 Bearer Services The basic services ... R) to transport user payloads The basic services are called transport services [7] or bearer services in ISDN ± and therefore in GSM, too The GSM bearer serv...

Ngày tải lên: 23/12/2013, 17:15

... 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 other hand the BCCH carriers ... Synchronization means on the one hand the time-wise synchronization of mobile station and base with regard to bits and 5.3 71 Synchronization frames, and on the other hand tuning...

Ngày tải lên: 20/01/2014, 23:20

... security and data protection, are gaining enormous importance in modern digital systems [17] GSM therefore introduced powerful algorithms and encryption techniques The various services and functions ... can calculate a set of (RAND, SRES) 2tuples in advance, store them in the HLR, and send them on demand to the requesting VLR The VLR stores this set (RAND[n], SRES[n]) and uses a...

Ngày tải lên: 20/01/2014, 23:20

... failure DCCH MS ! N 00101111 Handover access DCCH MS ! N ± Handover command DCCH N ! MS 00101011 Handover complete DCCH MS ! N 00101100 Ciphering Handover Message Handover failure Channel release ... 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 services of call con...

Ngày tải lên: 20/01/2014, 23:20

... categories: ² Handover because of more favorable path loss conditions ² Mandatory intercell handover ² Mandatory intracell handover 200 Roaming and Switching Table 8.1 Threshold values for the GSM handover ... standardizing only the signaling interface that de®nes the processing of the handover and through transferring the handover decision to the BSS The GSM handover is thus a networ...

Ngày tải lên: 20/01/2014, 23:20