umts r99 architecture
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UMTS R99 Architecture
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3GPP Release 99 Reference Architecture
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UMTS Terrestial Radio Access Network (UTRAN)
• WCDMA Radio Interface Key Change from GSM
• UTRAN elements are comparable to GSM BSC & BTS
• Common Interface (Iu) for both PS and CS Core
• Core elements do not change dramatically 3G SMSC/VLR provides ATM based IuCS interface
3G SGSN supports ATM based IuPS interface
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UTRAN Architecture • Hierarchical Architecture • Radio Network Subsystem (RNS) • UTRAN Elements: – Radio Network Controller – Node B (Base Station) • One RNC controls number of Node B’s • Node B is only connected to one RNC • New interface Iur for Macrodiversity
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UTRAN Functions Functions related to overall system access control – System information broadcasting Functions related to radio channel ciphering – Radio channel ciphering – Radio channel deciphering Functions related to handover – Radio environment survey – Handover decision – Macrodiversity control – Handover Control – Handover execution – Handover completion – SRNS Relocation – InterSystem handover
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UTRAN Functions Functions related to radio resource management and control
– Radio bearer connection setup and release (Radio Bearer Control)
– Reservation and release of physical radio channels – Allocation and deallocation of physical radio channels
– Packet data transfer over radio function – RF power control – RF power setting – Radio channel coding – Radio channel decoding – Channel coding control – Initial (random) access detection and handling
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Node B • Standardization term (normally called as Base Station)
• Comparable to Base Transceiver Station in GSM
• Responsible for Air Interface Layer 1 • Key Node B Functions: • Modulation and spreading • RF Processing • Innerloop power control • Rate matching • Macro diversity combining/splitting inside Node B
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Radio Network Controller (RNC) •Comparable to Base Station Controller in GSM • Responsible for L2 processing of user data • Responsible for Radio Resource Management • Key RNC Functions: • Closed loop power control • Handover control • Admission control • Code allocation • Packet scheduling • Macro diversity combining/splitting over number of • Node Bs
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Logical role of RNC •RNC controlling one Node B is indicated as ControllingNRC (CNRC)
• RNC that is in charge of controlling a mobile is called serving NRC (SNRC)
• Any other RNC controlling a cell used by the mobile is called drift RNC (DRNC). It can perform macro diversity combining and splitting of the signals. It does not perform layer 1 processing of the user plane, but instead routes the data transparently via Iur and Iub.
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Macro Diversity
• Softer Handover • •1 BS • •1 RNC
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Macro Diversity
• Soft Handover • Number of BSs •1 RNC (MDC)
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Macro Diversity
• Soft Handover • Number of BSs • 1 Serving RNC (MDC) • Number of Drift RNC
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Macro Diversity
• SRNC Anchoring
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Macro Diversity
• SRNC Relocation
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Interfaces of UTRAN • Iub is the interface between Node B and RNC – Unlike in Abis interface of GSM interface Iub is open interface and allows the interoperability of different vendors NodeBs and RNCs.
• Iur denotes the interface between two RNCs and it is utilized to relay data and control information in case of intraRNS handover.
• Iuinterface connects UTRAN to CN • It is notable that the single interface deals with both CS and PS traffic
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UMTS protocol internetworking architecture
• Transport network layer is responsible for providing a general purpose transport service (user data and control data) for all UMTS network elements. – Physical layer in Uu interface is WCDMA – Physical layer fixed network side is based either on pleisochronous or synchronous digital hierarchy (PLH/SDH) • Radio network layer protocols ensure internetworking between UE and CN on all radio access bearer related aspects. • System network layer protocols extend from UE until the transit network edge of CN. They ensure internetworking on UMTS communication service related aspects.
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UMTS protocol internetworking architecture
• Layers can further be divided into – Planes: • Control plane: All protocols dealing with control aspects.
• User plane: All protocols dealing with user data transfer.
– Domains • Circuit switched (CS) • Packet switched (PS)
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General Protocol model for UTRAN
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3GPP Release 99 Reference Architecture
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Radio Access Network Application Part (RANAP)
• Key RANAP functions: • Radio Access Bearer (between UECN) • RAB SetUP • RAB Modification • Clearing RAB • Iu Bearer Release • SRNC Relocation • Paging Commands
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IuCS
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IuPS
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3GPP Release 99 Reference Architecture
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IuBC
•Between RNC and Common Broadcast Center CBC •Service Area Broadcast Protocol (SABP)
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3GPP Release 99 Reference Architecture
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Radio Network Subsystem Application Part (RNSAP)
Key RNSAP Functions: •Radio Link • Management (between SRNC and DRNC) • Reconfiguration (between SRNC and DRNC) • Supervision (reports from DRNC to SRNC) • Common Control Channel (CCCH) Signalling Transfer
• Paging • Relocation Execution
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Iur
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3GPP Release 99 Reference Architecture
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Node B Application Part (NBAP)
Key NBAP Functions: • Cell Configuration Management • Common Transport Channel Management • System Information Management • Configuration Verification/Alignment • Measurements on Common Resources • Radio Link Management & Supervision
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Iub