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BSNL's 3G Network Rollout and Architecture Overview by Rajeev Bansal, DGM

This document presents a comprehensive overview of BSNL's 3G network rollout, emphasizing network architecture, primary and secondary site distinctions, and design principles for nodes within the core network. Rajeev Bansal, DGM of GSM & 3G, shares insights into the transition from monolithic to layered architecture, detailing the interface connections between MSC, MGW, BSC, and other critical network components. The report also highlights the Video Gateway's role in supporting mobile video services, including video calls and conferencing.

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BSNL's 3G Network Rollout and Architecture Overview by Rajeev Bansal, DGM

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  1. BSNL 3G Roll Out Rajeev Bansal DGM (GSM & 3G), ALTTC, Ghaziabad

  2. UE UE UE AN AN AN BSS BSS BSS Um Um Um Abis Abis Abis A A A SIM SIM SIM MT MT MT BTS BTS BTS SIM SIM SIM MT MT MT BSC BSC BSC H Iu Iu Iu F Gr RNS Gf Gn + RNS Note: Not all interfaces UTRAN are shown and named 3GPP Network Reference Model CN CN External External Networks Networks MSC-S MSC SCF SCF MSC MSC SCF SCF E, E, G G GMSC GMSC GMSC GMSC MGW MSC SMS SMS - - SC SC MSC MSC D D H HLR HLR AUC AUC HLR HLR AUC AUC ISDN ISDN F PSTN PSTN PSPDN PSPDN SMS SMS - - SMS SMS - - EIR EIR GMSC GMSC CSPDN CSPDN EIR EIR Gr GMSC GMSC PDN: PDN: RNS Gb Gb - - Intranet Intranet SMS SMS - - SMS SMS - - Cu Cu Uu Uu Iub Iub USIM USIM ME ME Gf - - Extranet Extranet BS BS IWMSC IWMSC USIM USIM ME ME RNC RNC IWMSC IWMSC - - Internet Internet Iu Iu SGSN SGSN Gn + SGSN SGSN GGSN GGSN GGSN GGSN Iur Iur Gd Gd , , Gp Gp , , RNS Gn Gn + + Cu Cu Uu Uu Iub Iub USIM USIM ME ME BS BS USIM USIM ME ME RNC RNC SGSN SGSN Note: SGSN SGSN Not all interfaces UTRAN are shown and named

  3. Primary Sites Vs Secondary Sites • Primary Site is the highest level site in the core network. • – Contains nodes, both controlling and switching nodes for CS and • PS respectively as well as BSC access nodes. • – MSC-S, M-MGw, SGSN, BSC nodes. • Secondary Site are sites with local switching capability and RAN • access. • – M-MGw and BSC nodes.

  4. Primary Sites Vs Secondary Sites

  5. Monolithic vs Layered Architecture

  6. Monolithic vs Layered Architecture MSC MSC-S MGW

  7. Migration from Monolithic to Layered architecture MSC Server MSC (Monolithic) GCP / SIGTRAN MGW Call Control Bearer

  8. Design Principle • Control Signaling between MSC-S and M-MGw is using SS7 over IP (SIGTRAN) • BSC is connected to one M-MGw only • Each monolithic MSC is connected to SGw over TDM • Signaling between Monolithic MSC and MSC-S will be via SGw.

  9. Design Principle BICC MSC-S MSC-S SIGTRAN MGW TDM MSC Monolithic MSC

  10. Transport Design Design Criteria: 􀂃 Up to 6 Node-Bs grouped into one cluster of a Sub-hub 􀂃 Up to 4 Sub-Hub clusters grouped into 1 hub. 􀂃 STM-1 from Hub/Sub-Hub to RNC through BSNL media Interfaces: 􀂃 End node-B: E1 interface. 􀂃 Sub-Hub: E1 interface / STM-1 interface. 􀂃 Hub: STM-1 interface.

  11. Hub- Sub-HUB Architecture

  12. Requirement from BSNL • 3E1 for Each Node B sites. • STM-1 between RNC and Hub RBS site • STM-1 between Hub RBS and Sub Hub RBS sites as • STM-1 between RNC and Core network. • Pool of IPs for O&M Purposes and GTPU Links (RNC to SGSN) – 16 IP per node-B – 64 IPs per RNC • 128 IPs for OSS • Separate IMSI series for USIM • STM from Every Circle to ViG

  13. Video Gateway (ViG) 􀂃 Video Gateway (ViG) interconnects WCDMA core network on one side and an IP network on other. It supports, IP-based Video Messaging systems and Multiparty Conferencing Systems 􀂃 Proposed ViG offers following services: – Mobile to Mobile Video Calls – Mobile to IP client (PC) video calls. – Circuit Switched Streaming – Multi-party Video Conferencing

  14. ViG: Basic Connectivity • Used for Mobile to PC and PC to Mobile Video Calls • Video Conferencing

  15. Key Services being offered • 􀂃 Mobile to Mobile Video Call • 􀂃 Mobile Broadband (High Speed Data) • 􀂃 Video Streaming (Clips/Movies etc.) • 􀂃 Mobile TV (Live TV Channels)

  16. Thank You !!!

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