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Lect12-GSM-Network-Elements [Compatibility Mode]

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GSM Network Elements and Interfaces Functional Basics GSM System Architecture The mobile radiotelephone system includes the following subsystems • Base Station Subsystem (BSS) • Network and Switching Subsystem (NSS) • Operations and Maintenance Subsystem (OSS) GSM Network Structure : Concept PLMN Terrestrial Public Land Mobile Network public mobile communications network network Mobile Um terminal device Air Interface PSTN BSS Public Switched Base Station Telephone Network Subsystem radio access NSS BSS Network Switching ISDN Base Station Subsystem Subsystem Integrated Services MS radio access Control/switching of Digital Network Mobile mobile services Station BSS Base Station Subsystem PDN radio access Public Data Network Mobile network Fixed network components components GSM-PLMN: Subsystems PLMN Terrestrial Public Land Mobile Network RSS Network Radio SubSystem PSTN Public Switched Telephone Network ISDN Integrated Services MS BSS NSS Digital Network Mobile Base Station Network Switching Station Subsystem Subsystem PDN Public Data Network OSS Operation SubSystem Function Units in GSM---PLMN-PLMN Radio Network Switching SubSystem Subsystem RSS = NSS Other networks Mobile Base Station Station +++ Subsystem MSMSMS BSSBSSBSS ACACAC EIREIREIR BTS HLR VLR TTT PSTN RRR BSCBSCBSC AAA MSC ISDN UUU Data OMCOMC----RRRR OMCOMC----SSSS MS = netnetnet-net --- ME + SIM works Operation SubSystem OSS Functional Units in GSM---PLMN-PLMN Phase 2+ RSS NSS Other networks MS +++ BSS ACACAC EIREIREIR BTS HLR/GR VLR TTT PSTN RRR BSCBSCBSC AAA MSC ISDN UUU CSE Data networks SGSN GGSN Inter/ intranet OMCOMC----BBBB OMCOMC----SSSS OSS Base station subsystem (BSS) The base station subsystem includes Base Transceiver Stations (BTS) that provides the radio link with MSs. • BTSs are controlled by a Base Station Controller (BSC),which also controls the Trans-Coder-Units (TCU). - These units enable users to reduce the number, and thus the cost, of PCM (Pulse CodeModulation) links needed between BSS and NSS. • The BSS has a standard interface so it can be connected to different types of switching centers. • The PCUSN is a separate node in the BSS that is used in order to provide the specific packet processing (PCU) of the GPRS. It provides the interworking function between the BSS and the GPRS Core Network . Network and switching subsystem (NSS) The NSS part handles all switching and routing functions. • The Mobile services Switching Center (MSC) is responsible for switching and routing. Reference data, specific to each subscriber, is stored in a database that is distributed among Home Location Registers (HLR). • To minimize access to the HLR, the MSC uses a Visitor Location Register (VLR), which contains working data for subscribers moving around its coverage area. • Network security and access controls are provided by the AUthentication Center (AUC) and by the Equipment Identity Register (EIR). Operations subsystem (OSS) The operations and support subsystem contains two parts: The Radio Operations and Maintenance Center (OMC-R) The Switching Operations and Maintenance Center (OMC-S). Main GSM Network Interfaces • E1 PCM links: The E1 PCM bit rate is 2.048Mbit/s carrying 32 time slots at 64kbit/s.Time slot 0 is used for synchronization only. The GSM system components use PCM E1 links or internal PCMs T1 PCM links: The T1 PCMbit rate is 1.544Mbit/s (24 time slots at 64 kbit/s plus one kilobyte for synchronization) Interfaces (PCM links): The components of the GSM network are linked together by PCM links on the following interfaces Abis (BTS-BSC) Ater (BSC-TCU) A (TCU-MSC) Common Interfaces: Radio interface, also called Um or Air interface Abis interface Agprs interface Ater interface Asynchronous BTS-PCU interface A interface OMN (Operations and Maintenance Network) interface MAP (Mobile Application Part) interface PSTN/PSPDN (Public Switched Telephone Network/Public Switched Packet Data Network) interface (enables the MSC to be connected to public speech or data networks via PCM (Pulse Code Modulation) links) GSM (Phase 1/2) - Other networks Interfaces MSC/xxx interworking interface AC Not Um Abis Asub A C specified MS BTS TRAU MSC HLR BTS E D T T B LMT LMT MSC VLR T F G LMT O EIR VLR OMC-R Radio interface: The radio interface provides communication between the mobile station and the BTS for Speech and data. The signaling protocol is based on the LAPDm layer 2. Abis interface: The Abis interface provides communication between the BTS and the BSC for radio traffic management and base station operations and maintenance using the LAPD protocol. Agprs interface: • The interface is composed of GPRS traffic at n*16kb/s. • The GPRS traffic uses Abis 16Kb/s TS between the BSC and the BTS, and Agprs 16Kb/s TS between the BSC and the PCUSN. Asynchronous BTS-PCU interface: • The Asynchronous BTS-PCU interface handles data between the BTS (Base Transceiver Station) and the PCU(Packet Control Unit). • This interface is applicable in V15 and supports all GPRS and EGPRS coding schemes. The data carried by this interface is transmitted to and from user phones by the BTS. Ater interface: • The Ater interface provides communication between the BSC and the TCU for traffic management using the LAPD protocol CCITT No. 7 signaling protocol and X.25 protocols are also used. A interface: • The A interface provides communication between the TCU and the MSC for traffic management using the CCITT No. 7 signaling protocol and the system Defined BSSAP (BSS Application Part) protocol. OMN interface: • The OMN interface provides communication between the BSC 2G and the OMC-R • using a X.25 no-type data transmission network for radio subsystem centralized operations. • The OMN interface provides communication between the BSCe3 and the OMC-R using Ethernet links for radio subsystem centralized operations. MAP interface: • The MAP interface provides communication between NSS various units, using the CCITT No. 7 signaling protocol and the MAP protocol. Communication between the MSC and database enables mobile station mobility monitoring. GSM Network Elements • Radio technology counterpart to GSM Mobile Station BTSE, BSC & TRAU • Signaling counterpart to BSC, MSC, HLR/AC, VLR & EIR Block switching r diagram • Safety check • Filtering Reverse speech • Temporal re-ordering Decoding • Amplification conversion • Reformation • Demodulation • Securing • HF generation Speech • Temporal paths Coding • Modulation conversion • Burst block formation • Amplifier Mobile Equipment ME Subscriber Identity Module SIM The Mobile Station MS MS = ME + SIM SIM card: • Subscriber licence • Personal identification (MSISDN, IMSI, TMSI, PIN, PUK,...) • Subscriber key (Ki, Kc) • Algorithms (A3, A8) • Personal telephone book • SIM toolkits,... ME: hard & software for radio transmission Base Station Subsystem BSS Architecture BTS TRAU MSC TRAU BTS BSC LMT BTS OMC-R BSS Architecture • Includes Antennas – sender & receiver together with the controlling equipments • The radio part of the BSS consists of one or more cells made of one or more BaseStations (BSs) or BTSs. • The interface between the BSC and BS is named A bis – interface. • The BS is directly in contact with the MS • The BSC carries these contacts to the MSC switch BTS • The BTS provides the interface between the fixed network and the mobile stations. • Communication with mobile stations is enabled by a radio interface, also called the Um interface. • The Radio interface carries signaling and speech/data channels between the base station (BTS) and the mobile stations (MS). • Communication with the fixed network is enabled via a second wire interface called the Abis interface. The Abis interface connects the BTS to its Base Station Controller (BSC). • The transmission of signaling, speech, and data channels is performed by means of PCM links. • The BTS configures its equipment and establishes, maintains, and clears calls to and from mobile stations as directed by the BSC. • The BTS organizes and manages radio electric resources, supervises its own equipment. • BTSs are connected to their controller (BSC) in one of the following configurations, • star • chain • loop The loop configuration provides a more reliable connection between the BTS and the BSC. Base Transceiver Station User and signaling BTS information Parity Inter- Hash coding Abis bits leaving Channel coding Um max. 16 bearers/cell Coding + • Frequency hopping • Synchronization Build-up of Burst (time and frequency) burst blocks multiplexing • Monitoring and optimization of transmission quality • Power Control PC • Timing Advance TA Additional information HF generation Transmit modulation Modulation Receive BSC • The BSC plays the linking role between the radio sites of the radio sub-system BSS, and the network sub-system NSS. • The BSC manages all the radio resources of its connected BTSs. • It does everything required to set up or re-establish calls, and perform specific call sustaining procedures (power control and handover management). • It also supervises the radio subsystem as a whole and is responsible for it. • It performs operations and maintenance functions under central OMC-R management control. • The BSC concentrates external PCM links, thus reducing the number of traffic channels used to be transmitted via the TCU to the MSC. Base Station Controller BSC BTS TRAU Asub TRAU Abis BTS • TRAU • • BSC • • • BTS • BSS control system OMC-B • Through-switching TRAU ⇔ BTS • Radio frequency management • Collecting error messages in BSS • Contact to OMC-B • Database storage, SW of BSS
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