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Simplified Call Flow Signaling: Handovers

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Simplified Call Flow Signaling:
Handovers
@3g4gUK
Handover: Basic Concepts
©3G4G
A1 A2 A3 A4
B1 B2f2
f1
Handover: Basic Concepts
©3G4G
A1 A2 A3 A4
B1 B2f2
f1
Break before make – Hard Handover

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Simplified Call Flow Signaling: Handovers

  1. 1. Simplified Call Flow Signaling: Handovers @3g4gUK
  2. 2. Handover: Basic Concepts ©3G4G A1 A2 A3 A4 B1 B2f2 f1
  3. 3. Handover: Basic Concepts ©3G4G A1 A2 A3 A4 B1 B2f2 f1 Break before make – Hard Handover
  4. 4. Handover: Basic Concepts ©3G4G A1 A2 A3 A4 B1 B2f2 f1 Break before make – Hard Handover Make before break – Soft Handover
  5. 5. Handover: Basic Concepts ©3G4G AS CS NAS Voice (PSTN) Network Data (IP) Network Radio Access Network Core Network Air Interface PS NAS Backhaul AS • Softer Handover – between cells belonging to same NodeB
  6. 6. Handover: Basic Concepts ©3G4G AS CS NAS Voice (PSTN) Network Data (IP) Network Radio Access Network Core Network Air Interface PS NAS Backhaul AS • Softer Handover – between cells belonging to same NodeB • Soft Handover – between cells belonging to different NodeB
  7. 7. Handover: Basic Concepts ©3G4G A1 A2 A3 A4 B1 B2f2 f1 Inter-frequency Handover – Always hard handover
  8. 8. What is Radio Access Technology (RAT)? ©3G4G BSC BTS MSC Voice (PSTN) Network SGSN Data (IP) Network RNC Node BeNodeB MME GGSN Access Network Core Network Air Interface MSUEUE BSSRNS S-GW P-GW 2G 2.5G 3G 4G EPC
  9. 9. Handover: Basic Concepts ©3G4G A1 A2 A3 A4 B1 B2RAT 2 RAT 1 Inter-RAT Handover – Always hard handover (Also known as Inter-System Hard Handover)
  10. 10. Handover (same RAT) ©3G4G UE AN2 CS CN PS CN Access Network Core Network Measurement Report Hello, AN1 told me to handover to you I was already informed, welcome AN1 UE 1 will be better served by you, OK for handover? Ok. Handover to AN2 UE1 is now connected to me. You can release its context
  11. 11. Handover (Inter-RAT) ©3G4G UE AN2 PS CN RAT1 PS CN RAT2 Measurement Report Hello, AN1 told me to handover to you I was already informed, welcome AN1 UE 1 will be better served by AN2, OK for handover? Handover to AN2 using <…> Handover succeeded. You can release UE 1 context AN1 wants to handover UE1 to AN2. Ok? Ok. Use <…> UE 1 wants to connect to you. OK for handover? Yes, please use these parameters <…> OK for handover, tell UE to use <…> Success You can release UE 1 context
  12. 12. Thank You To learn more, visit: 3G4G Website – http://www.3g4g.co.uk/ 3G4G Blog – http://blog.3g4g.co.uk/ 3G4G Small Cells Blog – http://smallcells.3g4g.co.uk/ Follow us on Twitter: https://twitter.com/3g4gUK Follow us on Linkedin: https://www.linkedin.com/company/3g4g ©3G4G

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